Android源码中的jni方法追踪
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2022-09-30 10:03:40
Android源码中的jni方法通常不是按照Java_路径名_方法名定义的,都是动态注册的,那么Android的JNI_Onload函数在哪里,我们又怎么去查询对应的函数实现呢?...
Android源码中的jni方法通常不是按照Java_路径名_方法名定义的,都是动态注册的,那么Android的JNI_Onload函数在哪里,我们又怎么去查询对应的函数实现呢?
答案就在AndroidRuntime.cpp
这里定义了动态加载的RegJNIRec结构体数组
static const RegJNIRec gRegJNI[] = { REG_JNI(register_com_android_internal_os_RuntimeInit), REG_JNI(register_android_os_SystemClock), REG_JNI(register_android_util_EventLog), REG_JNI(register_android_util_Log), REG_JNI(register_android_util_MemoryIntArray), REG_JNI(register_android_util_PathParser), REG_JNI(register_android_app_admin_SecurityLog), REG_JNI(register_android_content_AssetManager), REG_JNI(register_android_content_StringBlock), REG_JNI(register_android_content_XmlBlock), REG_JNI(register_android_text_AndroidCharacter), REG_JNI(register_android_text_StaticLayout), REG_JNI(register_android_text_AndroidBidi), REG_JNI(register_android_view_InputDevice), REG_JNI(register_android_view_KeyCharacterMap), REG_JNI(register_android_os_Process), REG_JNI(register_android_os_SystemProperties), REG_JNI(register_android_os_Binder), REG_JNI(register_android_os_Parcel), REG_JNI(register_android_nio_utils), REG_JNI(register_android_graphics_Canvas), REG_JNI(register_android_graphics_Graphics), REG_JNI(register_android_view_DisplayEventReceiver), REG_JNI(register_android_view_RenderNode), REG_JNI(register_android_view_RenderNodeAnimator), REG_JNI(register_android_view_GraphicBuffer), REG_JNI(register_android_view_DisplayListCanvas), REG_JNI(register_android_view_HardwareLayer), REG_JNI(register_android_view_ThreadedRenderer), REG_JNI(register_android_view_Surface), REG_JNI(register_android_view_SurfaceControl), REG_JNI(register_android_view_SurfaceSession), REG_JNI(register_android_view_TextureView), REG_JNI(register_com_android_internal_view_animation_NativeInterpolatorFactoryHelper), REG_JNI(register_com_google_android_gles_jni_EGLImpl), REG_JNI(register_com_google_android_gles_jni_GLImpl), REG_JNI(register_android_opengl_jni_EGL14), REG_JNI(register_android_opengl_jni_EGLExt), REG_JNI(register_android_opengl_jni_GLES10), REG_JNI(register_android_opengl_jni_GLES10Ext), REG_JNI(register_android_opengl_jni_GLES11), REG_JNI(register_android_opengl_jni_GLES11Ext), REG_JNI(register_android_opengl_jni_GLES20), REG_JNI(register_android_opengl_jni_GLES30), REG_JNI(register_android_opengl_jni_GLES31), REG_JNI(register_android_opengl_jni_GLES31Ext), REG_JNI(register_android_opengl_jni_GLES32), REG_JNI(register_android_graphics_Bitmap), REG_JNI(register_android_graphics_BitmapFactory), REG_JNI(register_android_graphics_BitmapRegionDecoder), REG_JNI(register_android_graphics_Camera), REG_JNI(register_android_graphics_CreateJavaOutputStreamAdaptor), REG_JNI(register_android_graphics_CanvasProperty), REG_JNI(register_android_graphics_ColorFilter), REG_JNI(register_android_graphics_DrawFilter), REG_JNI(register_android_graphics_FontFamily), REG_JNI(register_android_graphics_Interpolator), REG_JNI(register_android_graphics_LayerRasterizer), REG_JNI(register_android_graphics_MaskFilter), REG_JNI(register_android_graphics_Matrix), REG_JNI(register_android_graphics_Movie), REG_JNI(register_android_graphics_NinePatch), REG_JNI(register_android_graphics_Paint), REG_JNI(register_android_graphics_Path), REG_JNI(register_android_graphics_PathMeasure), REG_JNI(register_android_graphics_PathEffect), REG_JNI(register_android_graphics_Picture), REG_JNI(register_android_graphics_PorterDuff), REG_JNI(register_android_graphics_Rasterizer), REG_JNI(register_android_graphics_Region), REG_JNI(register_android_graphics_Shader), REG_JNI(register_android_graphics_SurfaceTexture), REG_JNI(register_android_graphics_Typeface), REG_JNI(register_android_graphics_Xfermode), REG_JNI(register_android_graphics_YuvImage), REG_JNI(register_android_graphics_drawable_AnimatedVectorDrawable), REG_JNI(register_android_graphics_drawable_VectorDrawable), REG_JNI(register_android_graphics_pdf_PdfDocument), REG_JNI(register_android_graphics_pdf_PdfEditor), REG_JNI(register_android_graphics_pdf_PdfRenderer), REG_JNI(register_android_database_CursorWindow), REG_JNI(register_android_database_SQLiteConnection), REG_JNI(register_android_database_SQLiteGlobal), REG_JNI(register_android_database_SQLiteDebug), REG_JNI(register_android_os_Debug), REG_JNI(register_android_os_FileObserver), REG_JNI(register_android_os_MessageQueue), REG_JNI(register_android_os_SELinux), REG_JNI(register_android_os_Trace), REG_JNI(register_android_os_UEventObserver), REG_JNI(register_android_net_LocalSocketImpl), REG_JNI(register_android_net_NetworkUtils), REG_JNI(register_android_net_TrafficStats), REG_JNI(register_android_os_MemoryFile), REG_JNI(register_com_android_internal_os_PathClassLoaderFactory), REG_JNI(register_com_android_internal_os_Zygote), REG_JNI(register_com_android_internal_util_VirtualRefBasePtr), REG_JNI(register_android_hardware_Camera), REG_JNI(register_android_hardware_camera2_CameraMetadata), REG_JNI(register_android_hardware_camera2_legacy_LegacyCameraDevice), REG_JNI(register_android_hardware_camera2_legacy_PerfMeasurement), REG_JNI(register_android_hardware_camera2_DngCreator), REG_JNI(register_android_hardware_Radio), REG_JNI(register_android_hardware_SensorManager), REG_JNI(register_android_hardware_SerialPort), REG_JNI(register_android_hardware_SoundTrigger), REG_JNI(register_android_hardware_UsbDevice), REG_JNI(register_android_hardware_UsbDeviceConnection), REG_JNI(register_android_hardware_UsbRequest), REG_JNI(register_android_hardware_location_ActivityRecognitionHardware), REG_JNI(register_android_hardware_location_ContextHubService), REG_JNI(register_android_media_AudioRecord), REG_JNI(register_android_media_AudioSystem), REG_JNI(register_android_media_AudioTrack), REG_JNI(register_android_media_JetPlayer), REG_JNI(register_android_media_RemoteDisplay), REG_JNI(register_android_media_ToneGenerator), REG_JNI(register_android_opengl_classes), REG_JNI(register_android_server_NetworkManagementSocketTagger), REG_JNI(register_android_ddm_DdmHandleNativeHeap), REG_JNI(register_android_backup_BackupDataInput), REG_JNI(register_android_backup_BackupDataOutput), REG_JNI(register_android_backup_FileBackupHelperBase), REG_JNI(register_android_backup_BackupHelperDispatcher), REG_JNI(register_android_app_backup_FullBackup), REG_JNI(register_android_app_Activity), REG_JNI(register_android_app_ActivityThread), REG_JNI(register_android_app_ApplicationLoaders), REG_JNI(register_android_app_NativeActivity), REG_JNI(register_android_util_jar_StrictJarFile), REG_JNI(register_android_view_InputChannel), REG_JNI(register_android_view_InputEventReceiver), REG_JNI(register_android_view_InputEventSender), REG_JNI(register_android_view_InputQueue), REG_JNI(register_android_view_KeyEvent), REG_JNI(register_android_view_MotionEvent), REG_JNI(register_android_view_PointerIcon), REG_JNI(register_android_view_VelocityTracker), REG_JNI(register_android_content_res_ObbScanner), REG_JNI(register_android_content_res_Configuration), REG_JNI(register_android_animation_PropertyValuesHolder), REG_JNI(register_com_android_internal_content_NativeLibraryHelper), REG_JNI(register_com_android_internal_net_NetworkStatsFactory), };
这个数组存储了140多个register函数指针
#ifdef NDEBUG #define REG_JNI(name) { name } struct RegJNIRec { int (*mProc)(JNIEnv*); }; #else #define REG_JNI(name) { name, #name } struct RegJNIRec { int (*mProc)(JNIEnv*); const char* mName; }; #endif
调用是发生在
static int register_jni_procs(const RegJNIRec array[], size_t count, JNIEnv* env) { for (size_t i = 0; i < count; i++) { if (array[i].mProc(env) < 0) { #ifndef NDEBUG ALOGD("----------!!! %s failed to load\n", array[i].mName); #endif return -1; } } return 0; }
由startReg调用register_jni_procs
/* * Register android native functions with the VM. */ /*static*/ int AndroidRuntime::startReg(JNIEnv* env) { ATRACE_NAME("RegisterAndroidNatives"); /* * This hook causes all future threads created in this process to be * attached to the JavaVM. (This needs to go away in favor of JNI * Attach calls.) */ androidSetCreateThreadFunc((android_create_thread_fn) javaCreateThreadEtc); ALOGV("--- registering native functions ---\n"); /* * Every "register" function calls one or more things that return * a local reference (e.g. FindClass). Because we haven't really * started the VM yet, they're all getting stored in the base frame * and never released. Use Push/Pop to manage the storage. */ env->PushLocalFrame(200); if (register_jni_procs(gRegJNI, NELEM(gRegJNI), env) < 0) { env->PopLocalFrame(NULL); return -1; } env->PopLocalFrame(NULL); //createJavaThread("fubar", quickTest, (void*) "hello"); return 0; }源头是由start函数调用的。
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