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/command_line_android.h"
   8 #include "base/android/jni_string.h"
   9 #include "base/android/library_loader/library_load_from_apk_status_codes.h"
  10 #include "base/android/library_loader/library_prefetcher.h"
  11 #include "base/at_exit.h"
  12 #include "base/metrics/histogram.h"
  13 #include "jni/LibraryLoader_jni.h"
  14
  15 namespace base {
  16 namespace android {
  17
  18 namespace {
  19
  20 base::AtExitManager* g_at_exit_manager = NULL;
  21 const char* g_library_version_number = "";
  22 LibraryLoadedHook* g_registration_callback = NULL;
  23
  24 enum RendererHistogramCode {
  25   // Renderer load at fixed address success, fail, or not attempted.
  26   // Renderers do not attempt to load at at fixed address if on a
  27   // low-memory device on which browser load at fixed address has already
  28   // failed.
  29   LFA_SUCCESS = 0,
  30   LFA_BACKOFF_USED = 1,
  31   LFA_NOT_ATTEMPTED = 2,
  32
  33   // End sentinel, also used as nothing-pending indicator.
  34   MAX_RENDERER_HISTOGRAM_CODE = 3,
  35   NO_PENDING_HISTOGRAM_CODE = MAX_RENDERER_HISTOGRAM_CODE
  36 };
  37
  38 enum BrowserHistogramCode {
  39   // Non-low-memory random address browser loads.
  40   NORMAL_LRA_SUCCESS = 0,
  41
  42   // Low-memory browser loads at fixed address, success or fail.
  43   LOW_MEMORY_LFA_SUCCESS = 1,
  44   LOW_MEMORY_LFA_BACKOFF_USED = 2,
  45
  46   MAX_BROWSER_HISTOGRAM_CODE = 3,
  47 };
  48
  49 RendererHistogramCode g_renderer_histogram_code = NO_PENDING_HISTOGRAM_CODE;
  50
  51 // The amount of time, in milliseconds, that it took to load the shared
  52 // libraries in the renderer. Set in
  53 // RegisterChromiumAndroidLinkerRendererHistogram.
  54 long g_renderer_library_load_time_ms = 0;
  55
  56 } // namespace
  57
  58 static void RegisterChromiumAndroidLinkerRendererHistogram(
  59     JNIEnv* env,
  60     jobject jcaller,
  61     jboolean requested_shared_relro,
  62     jboolean load_at_fixed_address_failed,
  63     jlong library_load_time_ms) {
  64   // Note a pending histogram value for later recording.
  65   if (requested_shared_relro) {
  66     g_renderer_histogram_code = load_at_fixed_address_failed
  67                                 ? LFA_BACKOFF_USED : LFA_SUCCESS;
  68   } else {
  69     g_renderer_histogram_code = LFA_NOT_ATTEMPTED;
  70   }
  71
  72   g_renderer_library_load_time_ms = library_load_time_ms;
  73 }
  74
  75 void RecordChromiumAndroidLinkerRendererHistogram() {
  76   if (g_renderer_histogram_code == NO_PENDING_HISTOGRAM_CODE)
  77     return;
  78   // Record and release the pending histogram value.
  79   UMA_HISTOGRAM_ENUMERATION("ChromiumAndroidLinker.RendererStates",
  80                             g_renderer_histogram_code,
  81                             MAX_RENDERER_HISTOGRAM_CODE);
  82   g_renderer_histogram_code = NO_PENDING_HISTOGRAM_CODE;
  83
  84   // Record how long it took to load the shared libraries.
  85   UMA_HISTOGRAM_TIMES("ChromiumAndroidLinker.RendererLoadTime",
  86       base::TimeDelta::FromMilliseconds(g_renderer_library_load_time_ms));
  87 }
  88
  89 static void RecordChromiumAndroidLinkerBrowserHistogram(
  90     JNIEnv* env,
  91     jobject jcaller,
  92     jboolean is_using_browser_shared_relros,
  93     jboolean load_at_fixed_address_failed,
  94     jint library_load_from_apk_status,
  95     jlong library_load_time_ms) {
  96   // For low-memory devices, record whether or not we successfully loaded the
  97   // browser at a fixed address. Otherwise just record a normal invocation.
  98   BrowserHistogramCode histogram_code;
  99   if (is_using_browser_shared_relros) {
 100     histogram_code = load_at_fixed_address_failed
 101                      ? LOW_MEMORY_LFA_BACKOFF_USED : LOW_MEMORY_LFA_SUCCESS;
 102   } else {
 103     histogram_code = NORMAL_LRA_SUCCESS;
 104   }
 105   UMA_HISTOGRAM_ENUMERATION("ChromiumAndroidLinker.BrowserStates",
 106                             histogram_code,
 107                             MAX_BROWSER_HISTOGRAM_CODE);
 108
 109   // Record the device support for loading a library directly from the APK file.
 110   UMA_HISTOGRAM_ENUMERATION("ChromiumAndroidLinker.LibraryLoadFromApkStatus",
 111                             library_load_from_apk_status,
 112                             LIBRARY_LOAD_FROM_APK_STATUS_CODES_MAX);
 113
 114   // Record how long it took to load the shared libraries.
 115   UMA_HISTOGRAM_TIMES("ChromiumAndroidLinker.BrowserLoadTime",
 116                       base::TimeDelta::FromMilliseconds(library_load_time_ms));
 117 }
 118
 119 void SetLibraryLoadedHook(LibraryLoadedHook* func) {
 120   g_registration_callback = func;
 121 }
 122
 123 static void InitCommandLine(JNIEnv* env,
 124                             jobject jcaller,
 125                             jobjectArray init_command_line) {
 126   InitNativeCommandLineFromJavaArray(env, init_command_line);
 127 }
 128
 129 static jboolean LibraryLoaded(JNIEnv* env, jobject jcaller) {
 130   if (g_registration_callback == NULL) {
 131     return true;
 132   }
 133   return g_registration_callback(env, NULL);
 134 }
 135
 136 void LibraryLoaderExitHook() {
 137   if (g_at_exit_manager) {
 138     delete g_at_exit_manager;
 139     g_at_exit_manager = NULL;
 140   }
 141 }
 142
 143 static jboolean ForkAndPrefetchNativeLibrary(JNIEnv* env, jclass clazz) {
 144   return NativeLibraryPrefetcher::ForkAndPrefetchNativeLibrary();
 145 }
 146
 147 bool RegisterLibraryLoaderEntryHook(JNIEnv* env) {
 148   return RegisterNativesImpl(env);
 149 }
 150
 151 void SetVersionNumber(const char* version_number) {
 152   g_library_version_number = strdup(version_number);
 153 }
 154
 155 ScopedJavaLocalRef<jstring> GetVersionNumber(JNIEnv* env, jobject jcaller) {
 156   return ConvertUTF8ToJavaString(env, g_library_version_number);
 157 }
 158
 159 LibraryProcessType GetLibraryProcessType(JNIEnv* env) {
 160   return static_cast<LibraryProcessType>(
 161       Java_LibraryLoader_getLibraryProcessType(env));
 162 }
 163
 164 void InitAtExitManager() {
 165   g_at_exit_manager = new base::AtExitManager();
 166 }
 167
 168 }  // namespace android
 169 }  // namespace base