Binder: Clean up JNI code (2b1494fc) · Commits · e / os / android_frameworks_base

core/jni/android_util_Binder.cpp

+68 −72

Original line number	Diff line number	Diff line
		@@ -20,8 +20,6 @@
		#include "android_os_Parcel.h"
		#include "android_util_Binder.h"

		#include <nativehelper/JNIHelp.h>

		#include <fcntl.h>
		#include <inttypes.h>
		#include <stdio.h>
		@@ -44,8 +42,9 @@
		#include <utils/SystemClock.h>
		#include <utils/threads.h>

		#include <nativehelper/ScopedUtfChars.h>
		#include <nativehelper/JNIHelp.h>
		#include <nativehelper/ScopedLocalRef.h>
		#include <nativehelper/ScopedUtfChars.h>

		#include "core_jni_helpers.h"

		@@ -174,8 +173,49 @@ static JNIEnv* javavm_to_jnienv(JavaVM* vm)
		return vm->GetEnv((void **)&env, JNI_VERSION_1_4) >= 0 ? env : NULL;
		}

		// Report a java.lang.Error (or subclass). This may terminate the runtime.
		static void report_java_lang_error(JNIEnv* env, jthrowable error)
		// Report a java.lang.Error (or subclass). This will terminate the runtime by
		// calling FatalError with a message derived from the given error.
		static void report_java_lang_error_fatal_error(JNIEnv* env, jthrowable error,
		const char* msg)
		{
		// Report an error: reraise the exception and ask the runtime to abort.

		// Try to get the exception string. Sometimes logcat isn't available,
		// so try to add it to the abort message.
		std::string exc_msg = "(Unknown exception message)";
		{
		ScopedLocalRef<jclass> exc_class(env, env->GetObjectClass(error));
		jmethodID method_id = env->GetMethodID(exc_class.get(), "toString",
		"()Ljava/lang/String;");
		ScopedLocalRef<jstring> jstr(
		env,
		reinterpret_cast<jstring>(
		env->CallObjectMethod(error, method_id)));
		env->ExceptionClear(); // Just for good measure.
		if (jstr.get() != nullptr) {
		ScopedUtfChars jstr_utf(env, jstr.get());
		if (jstr_utf.c_str() != nullptr) {
		exc_msg = jstr_utf.c_str();
		} else {
		env->ExceptionClear();
		}
		}
		}

		env->Throw(error);
		ALOGE("java.lang.Error thrown during binder transaction (stack trace follows) : ");
		env->ExceptionDescribe();

		std::string error_msg = base::StringPrintf(
		"java.lang.Error thrown during binder transaction: %s",
		exc_msg.c_str());
		env->FatalError(error_msg.c_str());
		}

		// Report a java.lang.Error (or subclass). This will terminate the runtime, either by
		// the uncaught exception handler, or explicitly by calling
		// report_java_lang_error_fatal_error.
		static void report_java_lang_error(JNIEnv* env, jthrowable error, const char* msg)
		{
		// Try to run the uncaught exception machinery.
		jobject thread = env->CallStaticObjectMethod(gThreadDispatchOffsets.mClass,
		@@ -187,77 +227,39 @@ static void report_java_lang_error(JNIEnv* env, jthrowable error)
		}
		// Some error occurred that meant that either dispatchUncaughtException could not be
		// called or that it had an error itself (as this should be unreachable under normal
		// conditions). Clear the exception.
		// conditions). As the binder code cannot handle Errors, attempt to log the error and
		// abort.
		env->ExceptionClear();
		report_java_lang_error_fatal_error(env, error, msg);
		}

		static void report_exception(JNIEnv* env, jthrowable excep, const char* msg)
		{
		env->ExceptionClear();

		jstring tagstr = env->NewStringUTF(LOG_TAG);
		jstring msgstr = NULL;
		if (tagstr != NULL) {
		msgstr = env->NewStringUTF(msg);
		}

		if ((tagstr == NULL) \|\| (msgstr == NULL)) {
		env->ExceptionClear(); /* assume exception (OOM?) was thrown */
		ALOGE("Unable to call Log.e()\n");
		ALOGE("%s", msg);
		goto bail;
		ScopedLocalRef<jstring> tagstr(env, env->NewStringUTF(LOG_TAG));
		ScopedLocalRef<jstring> msgstr;
		if (tagstr != nullptr) {
		msgstr.reset(env->NewStringUTF(msg));
		}

		env->CallStaticIntMethod(
		gLogOffsets.mClass, gLogOffsets.mLogE, tagstr, msgstr, excep);
		if ((tagstr != nullptr) && (msgstr != nullptr)) {
		env->CallStaticIntMethod(gLogOffsets.mClass, gLogOffsets.mLogE,
		tagstr.get(), msgstr.get(), excep);
		if (env->ExceptionCheck()) {
		/* attempting to log the failure has failed */
		// Attempting to log the failure has failed.
		ALOGW("Failed trying to log exception, msg='%s'\n", msg);
		env->ExceptionClear();
		}

		if (env->IsInstanceOf(excep, gErrorOffsets.mClass)) {
		// Try to report the error. This should not return under normal circumstances.
		report_java_lang_error(env, excep);
		// The traditional handling: re-raise and abort.

		/*
		* It's an Error: Reraise the exception and ask the runtime to abort.
		*/

		// Try to get the exception string. Sometimes logcat isn't available,
		// so try to add it to the abort message.
		std::string exc_msg = "(Unknown exception message)";
		{
		ScopedLocalRef<jclass> exc_class(env, env->GetObjectClass(excep));
		jmethodID method_id = env->GetMethodID(exc_class.get(),
		"toString",
		"()Ljava/lang/String;");
		ScopedLocalRef<jstring> jstr(
		env,
		reinterpret_cast<jstring>(
		env->CallObjectMethod(excep, method_id)));
		env->ExceptionClear(); // Just for good measure.
		if (jstr.get() != nullptr) {
		ScopedUtfChars jstr_utf(env, jstr.get());
		exc_msg = jstr_utf.c_str();
		}
		} else {
		env->ExceptionClear(); /* assume exception (OOM?) was thrown */
		ALOGE("Unable to call Log.e()\n");
		ALOGE("%s", msg);
		}

		env->Throw(excep);
		ALOGE("java.lang.Error thrown during binder transaction (stack trace follows) : ");
		env->ExceptionDescribe();

		std::string error_msg = base::StringPrintf(
		"java.lang.Error thrown during binder transaction: %s",
		exc_msg.c_str());
		env->FatalError(error_msg.c_str());
		if (env->IsInstanceOf(excep, gErrorOffsets.mClass)) {
		report_java_lang_error(env, excep, msg);
		}

		bail:
		/* discard local refs created for us by VM */
		env->DeleteLocalRef(tagstr);
		env->DeleteLocalRef(msgstr);
		}

		class JavaBBinderHolder;
		@@ -309,14 +311,11 @@ protected:
		code, reinterpret_cast<jlong>(&data), reinterpret_cast<jlong>(reply), flags);

		if (env->ExceptionCheck()) {
		jthrowable excep = env->ExceptionOccurred();
		report_exception(env, excep,
		ScopedLocalRef<jthrowable> excep(env, env->ExceptionOccurred());
		report_exception(env, excep.get(),
		"*** Uncaught remote exception! "
		"(Exceptions are not yet supported across processes.)");
		res = JNI_FALSE;

		/* clean up JNI local ref -- we don't return to Java code */
		env->DeleteLocalRef(excep);
		}

		// Check if the strict mode state changed while processing the
		@@ -328,11 +327,9 @@ protected:
		}

		if (env->ExceptionCheck()) {
		jthrowable excep = env->ExceptionOccurred();
		report_exception(env, excep,
		ScopedLocalRef<jthrowable> excep(env, env->ExceptionOccurred());
		report_exception(env, excep.get(),
		"*** Uncaught exception in onBinderStrictModePolicyChange");
		/* clean up JNI local ref -- we don't return to Java code */
		env->DeleteLocalRef(excep);
		}

		// Need to always call through the native implementation of
		@@ -475,9 +472,8 @@ public:
		if (mObject != NULL) {
		result = env->IsSameObject(obj, mObject);
		} else {
		jobject me = env->NewLocalRef(mObjectWeak);
		result = env->IsSameObject(obj, me);
		env->DeleteLocalRef(me);
		ScopedLocalRef<jobject> me(env, env->NewLocalRef(mObjectWeak));
		result = env->IsSameObject(obj, me.get());
		}
		return result;
		}