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