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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if defined(ART_TARGET_ANDROID)
#include "native_loader_test.h"
#include <dlfcn.h>
#include <android-base/strings.h>
#include <gtest/gtest.h>
#include "nativehelper/scoped_utf_chars.h"
#include "nativeloader/native_loader.h"
#include "public_libraries.h"
namespace android {
namespace nativeloader {
using ::testing::Eq;
using ::testing::NotNull;
using ::testing::StrEq;
using internal::ConfigEntry;
using internal::ParseApexLibrariesConfig;
using internal::ParseConfig;
#if defined(__LP64__)
#define LIB_DIR "lib64"
#else
#define LIB_DIR "lib"
#endif
static void* const any_nonnull = reinterpret_cast<void*>(0x12345678);
// Custom matcher for comparing namespace handles
MATCHER_P(NsEq, other, "") {
*result_listener << "comparing " << reinterpret_cast<const char*>(arg) << " and " << other;
return strcmp(reinterpret_cast<const char*>(arg), reinterpret_cast<const char*>(other)) == 0;
}
/////////////////////////////////////////////////////////////////
// Test fixture
class NativeLoaderTest : public ::testing::TestWithParam<bool> {
protected:
bool IsBridged() { return GetParam(); }
void SetUp() override {
mock = std::make_unique<testing::NiceMock<MockPlatform>>(IsBridged());
env = std::make_unique<JNIEnv>();
env->functions = CreateJNINativeInterface();
}
void SetExpectations() {
std::vector<std::string> default_public_libs =
android::base::Split(preloadable_public_libraries(), ":");
for (auto l : default_public_libs) {
EXPECT_CALL(*mock,
mock_dlopen_ext(false, StrEq(l.c_str()), RTLD_NOW | RTLD_NODELETE, NotNull()))
.WillOnce(Return(any_nonnull));
}
}
void RunTest() { InitializeNativeLoader(); }
void TearDown() override {
ResetNativeLoader();
delete env->functions;
mock.reset();
}
std::unique_ptr<JNIEnv> env;
};
/////////////////////////////////////////////////////////////////
TEST_P(NativeLoaderTest, InitializeLoadsDefaultPublicLibraries) {
SetExpectations();
RunTest();
}
TEST_P(NativeLoaderTest, OpenNativeLibraryWithoutClassloaderInApex) {
const char* test_lib_path = "libfoo.so";
void* fake_handle = &fake_handle; // Arbitrary non-null value
EXPECT_CALL(*mock,
mock_dlopen_ext(false, StrEq(test_lib_path), RTLD_NOW, NsEq("com_android_art")))
.WillOnce(Return(fake_handle));
bool needs_native_bridge = false;
char* errmsg = nullptr;
EXPECT_EQ(fake_handle,
OpenNativeLibrary(env.get(),
/*target_sdk_version=*/17,
test_lib_path,
/*class_loader=*/nullptr,
/*caller_location=*/"/apex/com.android.art/javalib/myloadinglib.jar",
/*library_path=*/nullptr,
&needs_native_bridge,
&errmsg));
// OpenNativeLibrary never uses nativebridge when there's no classloader. That
// should maybe change.
EXPECT_EQ(needs_native_bridge, false);
EXPECT_EQ(errmsg, nullptr);
}
TEST_P(NativeLoaderTest, OpenNativeLibraryWithoutClassloaderInFramework) {
const char* test_lib_path = "libfoo.so";
void* fake_handle = &fake_handle; // Arbitrary non-null value
EXPECT_CALL(*mock, mock_dlopen_ext(false, StrEq(test_lib_path), RTLD_NOW, NsEq("system")))
.WillOnce(Return(fake_handle));
bool needs_native_bridge = false;
char* errmsg = nullptr;
EXPECT_EQ(fake_handle,
OpenNativeLibrary(env.get(),
/*target_sdk_version=*/17,
test_lib_path,
/*class_loader=*/nullptr,
/*caller_location=*/"/system/framework/framework.jar!classes1.dex",
/*library_path=*/nullptr,
&needs_native_bridge,
&errmsg));
// OpenNativeLibrary never uses nativebridge when there's no classloader. That
// should maybe change.
EXPECT_EQ(needs_native_bridge, false);
EXPECT_EQ(errmsg, nullptr);
}
TEST_P(NativeLoaderTest, OpenNativeLibraryWithoutClassloaderAndCallerLocation) {
const char* test_lib_path = "libfoo.so";
void* fake_handle = &fake_handle; // Arbitrary non-null value
EXPECT_CALL(*mock, mock_dlopen_ext(false, StrEq(test_lib_path), RTLD_NOW, NsEq("system")))
.WillOnce(Return(fake_handle));
bool needs_native_bridge = false;
char* errmsg = nullptr;
EXPECT_EQ(fake_handle,
OpenNativeLibrary(env.get(),
/*target_sdk_version=*/17,
test_lib_path,
/*class_loader=*/nullptr,
/*caller_location=*/nullptr,
/*library_path=*/nullptr,
&needs_native_bridge,
&errmsg));
// OpenNativeLibrary never uses nativebridge when there's no classloader. That
// should maybe change.
EXPECT_EQ(needs_native_bridge, false);
EXPECT_EQ(errmsg, nullptr);
}
INSTANTIATE_TEST_SUITE_P(NativeLoaderTests, NativeLoaderTest, testing::Bool());
/////////////////////////////////////////////////////////////////
std::string default_public_and_extended_libraries() {
std::string public_libs = default_public_libraries();
const std::string& ext_libs = extended_public_libraries();
if (!ext_libs.empty()) {
public_libs = public_libs + ":" + ext_libs;
}
return public_libs;
}
class NativeLoaderTest_Create : public NativeLoaderTest {
protected:
// Test inputs (initialized to the default values). Overriding these
// must be done before calling SetExpectations() and RunTest().
uint32_t target_sdk_version = 29;
std::string class_loader = "my_classloader";
bool is_shared = false;
std::string dex_path = "/data/app/foo/classes.dex";
std::string library_path = "/data/app/foo/" LIB_DIR "/arm";
std::string permitted_path = "/data/app/foo/" LIB_DIR;
// expected output (.. for the default test inputs)
std::string expected_namespace_name = "classloader-namespace";
uint64_t expected_namespace_flags =
ANDROID_NAMESPACE_TYPE_ISOLATED | ANDROID_NAMESPACE_TYPE_ALSO_USED_AS_ANONYMOUS;
std::string expected_library_path = library_path;
std::string expected_permitted_path = std::string("/data:/mnt/expand:") + permitted_path;
std::string expected_parent_namespace = "system";
bool expected_link_with_platform_ns = true;
bool expected_link_with_art_ns = true;
bool expected_link_with_i18n_ns = true;
bool expected_link_with_conscrypt_ns = false;
bool expected_link_with_sphal_ns = !vendor_public_libraries().empty();
bool expected_link_with_product_ns = !product_public_libraries().empty();
bool expected_link_with_vndk_ns = false;
bool expected_link_with_vndk_product_ns = false;
bool expected_link_with_default_ns = false;
bool expected_link_with_neuralnetworks_ns = true;
std::string expected_shared_libs_to_platform_ns = default_public_and_extended_libraries();
std::string expected_shared_libs_to_art_ns = apex_public_libraries().at("com_android_art");
std::string expected_shared_libs_to_i18n_ns = apex_public_libraries().at("com_android_i18n");
std::string expected_shared_libs_to_conscrypt_ns = apex_jni_libraries("com_android_conscrypt");
std::string expected_shared_libs_to_sphal_ns = vendor_public_libraries();
std::string expected_shared_libs_to_product_ns = product_public_libraries();
std::string expected_shared_libs_to_vndk_ns = vndksp_libraries_vendor();
std::string expected_shared_libs_to_vndk_product_ns = vndksp_libraries_product();
std::string expected_shared_libs_to_default_ns = default_public_and_extended_libraries();
std::string expected_shared_libs_to_neuralnetworks_ns = apex_public_libraries().at("com_android_neuralnetworks");
void SetExpectations() {
NativeLoaderTest::SetExpectations();
ON_CALL(*mock, JniObject_getParent(StrEq(class_loader))).WillByDefault(Return(nullptr));
EXPECT_CALL(*mock, NativeBridgeIsPathSupported(_)).Times(testing::AnyNumber());
EXPECT_CALL(*mock, NativeBridgeInitialized()).Times(testing::AnyNumber());
EXPECT_CALL(*mock, mock_create_namespace(
Eq(IsBridged()), StrEq(expected_namespace_name), nullptr,
StrEq(expected_library_path), expected_namespace_flags,
StrEq(expected_permitted_path), NsEq(expected_parent_namespace.c_str())))
.WillOnce(Return(TO_MOCK_NAMESPACE(TO_ANDROID_NAMESPACE(dex_path.c_str()))));
if (expected_link_with_platform_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("system"),
StrEq(expected_shared_libs_to_platform_ns)))
.WillOnce(Return(true));
}
if (expected_link_with_art_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("com_android_art"),
StrEq(expected_shared_libs_to_art_ns)))
.WillOnce(Return(true));
}
if (expected_link_with_i18n_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("com_android_i18n"),
StrEq(expected_shared_libs_to_i18n_ns)))
.WillOnce(Return(true));
}
if (expected_link_with_sphal_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("sphal"),
StrEq(expected_shared_libs_to_sphal_ns)))
.WillOnce(Return(true));
}
if (expected_link_with_product_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("product"),
StrEq(expected_shared_libs_to_product_ns)))
.WillOnce(Return(true));
}
if (expected_link_with_vndk_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("vndk"),
StrEq(expected_shared_libs_to_vndk_ns)))
.WillOnce(Return(true));
}
if (expected_link_with_vndk_product_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("vndk_product"),
StrEq(expected_shared_libs_to_vndk_product_ns)))
.WillOnce(Return(true));
}
if (expected_link_with_default_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("default"),
StrEq(expected_shared_libs_to_default_ns)))
.WillOnce(Return(true));
}
if (expected_link_with_neuralnetworks_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("com_android_neuralnetworks"),
StrEq(expected_shared_libs_to_neuralnetworks_ns)))
.WillOnce(Return(true));
}
if (expected_link_with_conscrypt_ns) {
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), _, NsEq("com_android_conscrypt"),
StrEq(expected_shared_libs_to_conscrypt_ns)))
.WillOnce(Return(true));
}
}
void RunTest() {
NativeLoaderTest::RunTest();
jstring err = CreateClassLoaderNamespace(
env(), target_sdk_version, env()->NewStringUTF(class_loader.c_str()), is_shared,
env()->NewStringUTF(dex_path.c_str()), env()->NewStringUTF(library_path.c_str()),
env()->NewStringUTF(permitted_path.c_str()), /*uses_library_list=*/ nullptr);
// no error
EXPECT_EQ(err, nullptr) << "Error is: " << std::string(ScopedUtfChars(env(), err).c_str());
if (!IsBridged()) {
struct android_namespace_t* ns =
FindNamespaceByClassLoader(env(), env()->NewStringUTF(class_loader.c_str()));
// The created namespace is for this apk
EXPECT_EQ(dex_path.c_str(), reinterpret_cast<const char*>(ns));
} else {
struct NativeLoaderNamespace* ns =
FindNativeLoaderNamespaceByClassLoader(env(), env()->NewStringUTF(class_loader.c_str()));
// The created namespace is for the this apk
EXPECT_STREQ(dex_path.c_str(),
reinterpret_cast<const char*>(ns->ToRawNativeBridgeNamespace()));
}
}
JNIEnv* env() { return NativeLoaderTest::env.get(); }
};
TEST_P(NativeLoaderTest_Create, DownloadedApp) {
SetExpectations();
RunTest();
}
TEST_P(NativeLoaderTest_Create, BundledSystemApp) {
dex_path = "/system/app/foo/foo.apk";
is_shared = true;
expected_namespace_name = "classloader-namespace-shared";
expected_namespace_flags |= ANDROID_NAMESPACE_TYPE_SHARED;
SetExpectations();
RunTest();
}
TEST_P(NativeLoaderTest_Create, BundledVendorApp) {
dex_path = "/vendor/app/foo/foo.apk";
is_shared = true;
expected_namespace_name = "classloader-namespace-shared";
expected_namespace_flags |= ANDROID_NAMESPACE_TYPE_SHARED;
SetExpectations();
RunTest();
}
TEST_P(NativeLoaderTest_Create, UnbundledVendorApp) {
dex_path = "/vendor/app/foo/foo.apk";
is_shared = false;
expected_namespace_name = "vendor-classloader-namespace";
expected_library_path = expected_library_path + ":/vendor/" LIB_DIR;
expected_permitted_path = expected_permitted_path + ":/vendor/" LIB_DIR;
expected_shared_libs_to_platform_ns =
default_public_libraries() + ":" + llndk_libraries_vendor();
expected_link_with_vndk_ns = true;
SetExpectations();
RunTest();
}
TEST_P(NativeLoaderTest_Create, BundledProductApp) {
dex_path = "/product/app/foo/foo.apk";
is_shared = true;
expected_namespace_name = "classloader-namespace-shared";
expected_namespace_flags |= ANDROID_NAMESPACE_TYPE_SHARED;
SetExpectations();
RunTest();
}
TEST_P(NativeLoaderTest_Create, SystemServerWithApexJars) {
dex_path = "/system/framework/services.jar:/apex/com.android.conscrypt/javalib/service-foo.jar";
is_shared = true;
expected_namespace_name = "classloader-namespace-shared";
expected_namespace_flags |= ANDROID_NAMESPACE_TYPE_SHARED;
expected_link_with_conscrypt_ns = true;
SetExpectations();
RunTest();
}
TEST_P(NativeLoaderTest_Create, UnbundledProductApp) {
dex_path = "/product/app/foo/foo.apk";
is_shared = false;
if (is_product_vndk_version_defined()) {
expected_namespace_name = "vendor-classloader-namespace";
expected_library_path = expected_library_path + ":/product/" LIB_DIR ":/system/product/" LIB_DIR;
expected_permitted_path =
expected_permitted_path + ":/product/" LIB_DIR ":/system/product/" LIB_DIR;
expected_shared_libs_to_platform_ns =
default_public_libraries() + ":" + llndk_libraries_product();
expected_link_with_vndk_product_ns = true;
}
SetExpectations();
RunTest();
}
TEST_P(NativeLoaderTest_Create, NamespaceForSharedLibIsNotUsedAsAnonymousNamespace) {
if (IsBridged()) {
// There is no shared lib in translated arch
// TODO(jiyong): revisit this
return;
}
// compared to apks, for java shared libs, library_path is empty; java shared
// libs don't have their own native libs. They use platform's.
library_path = "";
expected_library_path = library_path;
// no ALSO_USED_AS_ANONYMOUS
expected_namespace_flags = ANDROID_NAMESPACE_TYPE_ISOLATED;
SetExpectations();
RunTest();
}
TEST_P(NativeLoaderTest_Create, TwoApks) {
SetExpectations();
const uint32_t second_app_target_sdk_version = 29;
const std::string second_app_class_loader = "second_app_classloader";
const bool second_app_is_shared = false;
const std::string second_app_dex_path = "/data/app/bar/classes.dex";
const std::string second_app_library_path = "/data/app/bar/" LIB_DIR "/arm";
const std::string second_app_permitted_path = "/data/app/bar/" LIB_DIR;
const std::string expected_second_app_permitted_path =
std::string("/data:/mnt/expand:") + second_app_permitted_path;
const std::string expected_second_app_parent_namespace = "classloader-namespace";
// no ALSO_USED_AS_ANONYMOUS
const uint64_t expected_second_namespace_flags = ANDROID_NAMESPACE_TYPE_ISOLATED;
// The scenario is that second app is loaded by the first app.
// So the first app's classloader (`classloader`) is parent of the second
// app's classloader.
ON_CALL(*mock, JniObject_getParent(StrEq(second_app_class_loader)))
.WillByDefault(Return(class_loader.c_str()));
// namespace for the second app is created. Its parent is set to the namespace
// of the first app.
EXPECT_CALL(*mock, mock_create_namespace(
Eq(IsBridged()), StrEq(expected_namespace_name), nullptr,
StrEq(second_app_library_path), expected_second_namespace_flags,
StrEq(expected_second_app_permitted_path), NsEq(dex_path.c_str())))
.WillOnce(Return(TO_MOCK_NAMESPACE(TO_ANDROID_NAMESPACE(second_app_dex_path.c_str()))));
EXPECT_CALL(*mock, mock_link_namespaces(Eq(IsBridged()), NsEq(second_app_dex_path.c_str()), _, _))
.WillRepeatedly(Return(true));
RunTest();
jstring err = CreateClassLoaderNamespace(
env(), second_app_target_sdk_version, env()->NewStringUTF(second_app_class_loader.c_str()),
second_app_is_shared, env()->NewStringUTF(second_app_dex_path.c_str()),
env()->NewStringUTF(second_app_library_path.c_str()),
env()->NewStringUTF(second_app_permitted_path.c_str()), /*uses_library_list=*/ nullptr);
// success
EXPECT_EQ(err, nullptr) << "Error is: " << std::string(ScopedUtfChars(env(), err).c_str());
if (!IsBridged()) {
struct android_namespace_t* ns =
FindNamespaceByClassLoader(env(), env()->NewStringUTF(second_app_class_loader.c_str()));
// The created namespace is for the second apk
EXPECT_EQ(second_app_dex_path.c_str(), reinterpret_cast<const char*>(ns));
} else {
struct NativeLoaderNamespace* ns = FindNativeLoaderNamespaceByClassLoader(
env(), env()->NewStringUTF(second_app_class_loader.c_str()));
// The created namespace is for the second apk
EXPECT_STREQ(second_app_dex_path.c_str(),
reinterpret_cast<const char*>(ns->ToRawNativeBridgeNamespace()));
}
}
INSTANTIATE_TEST_SUITE_P(NativeLoaderTests_Create, NativeLoaderTest_Create, testing::Bool());
const std::function<Result<bool>(const struct ConfigEntry&)> always_true =
[](const struct ConfigEntry&) -> Result<bool> { return true; };
TEST(NativeLoaderConfigParser, NamesAndComments) {
const char file_content[] = R"(
######
libA.so
#libB.so
libC.so
libD.so
#### libE.so
)";
const std::vector<std::string> expected_result = {"libA.so", "libC.so", "libD.so"};
Result<std::vector<std::string>> result = ParseConfig(file_content, always_true);
ASSERT_RESULT_OK(result);
ASSERT_EQ(expected_result, *result);
}
TEST(NativeLoaderConfigParser, WithBitness) {
const char file_content[] = R"(
libA.so 32
libB.so 64
libC.so
)";
#if defined(__LP64__)
const std::vector<std::string> expected_result = {"libB.so", "libC.so"};
#else
const std::vector<std::string> expected_result = {"libA.so", "libC.so"};
#endif
Result<std::vector<std::string>> result = ParseConfig(file_content, always_true);
ASSERT_RESULT_OK(result);
ASSERT_EQ(expected_result, *result);
}
TEST(NativeLoaderConfigParser, WithNoPreload) {
const char file_content[] = R"(
libA.so nopreload
libB.so nopreload
libC.so
)";
const std::vector<std::string> expected_result = {"libC.so"};
Result<std::vector<std::string>> result =
ParseConfig(file_content,
[](const struct ConfigEntry& entry) -> Result<bool> { return !entry.nopreload; });
ASSERT_RESULT_OK(result);
ASSERT_EQ(expected_result, *result);
}
TEST(NativeLoaderConfigParser, WithNoPreloadAndBitness) {
const char file_content[] = R"(
libA.so nopreload 32
libB.so 64 nopreload
libC.so 32
libD.so 64
libE.so nopreload
)";
#if defined(__LP64__)
const std::vector<std::string> expected_result = {"libD.so"};
#else
const std::vector<std::string> expected_result = {"libC.so"};
#endif
Result<std::vector<std::string>> result =
ParseConfig(file_content,
[](const struct ConfigEntry& entry) -> Result<bool> { return !entry.nopreload; });
ASSERT_RESULT_OK(result);
ASSERT_EQ(expected_result, *result);
}
TEST(NativeLoaderConfigParser, RejectMalformed) {
ASSERT_FALSE(ParseConfig("libA.so 32 64", always_true).ok());
ASSERT_FALSE(ParseConfig("libA.so 32 32", always_true).ok());
ASSERT_FALSE(ParseConfig("libA.so 32 nopreload 64", always_true).ok());
ASSERT_FALSE(ParseConfig("32 libA.so nopreload", always_true).ok());
ASSERT_FALSE(ParseConfig("nopreload libA.so 32", always_true).ok());
ASSERT_FALSE(ParseConfig("libA.so nopreload # comment", always_true).ok());
}
TEST(NativeLoaderApexLibrariesConfigParser, BasicLoading) {
const char file_content[] = R"(
# comment
jni com_android_foo libfoo.so
# Empty line is ignored
jni com_android_bar libbar.so:libbar2.so
public com_android_bar libpublic.so
)";
auto jni_libs = ParseApexLibrariesConfig(file_content, "jni");
ASSERT_RESULT_OK(jni_libs);
std::map<std::string, std::string> expected_jni_libs {
{"com_android_foo", "libfoo.so"},
{"com_android_bar", "libbar.so:libbar2.so"},
};
ASSERT_EQ(expected_jni_libs, *jni_libs);
auto public_libs = ParseApexLibrariesConfig(file_content, "public");
ASSERT_RESULT_OK(public_libs);
std::map<std::string, std::string> expected_public_libs {
{"com_android_bar", "libpublic.so"},
};
ASSERT_EQ(expected_public_libs, *public_libs);
}
TEST(NativeLoaderApexLibrariesConfigParser, RejectMalformedLine) {
const char file_content[] = R"(
jni com_android_foo libfoo
# missing <library list>
jni com_android_bar
)";
auto result = ParseApexLibrariesConfig(file_content, "jni");
ASSERT_FALSE(result.ok());
ASSERT_EQ("Malformed line \"jni com_android_bar\"", result.error().message());
}
TEST(NativeLoaderApexLibrariesConfigParser, RejectInvalidTag) {
const char file_content[] = R"(
jni apex1 lib
public apex2 lib
# unknown tag
unknown com_android_foo libfoo
)";
auto result = ParseApexLibrariesConfig(file_content, "jni");
ASSERT_FALSE(result.ok());
ASSERT_EQ("Invalid tag \"unknown com_android_foo libfoo\"", result.error().message());
}
TEST(NativeLoaderApexLibrariesConfigParser, RejectInvalidApexNamespace) {
const char file_content[] = R"(
# apex linker namespace should be mangled ('.' -> '_')
jni com.android.foo lib
)";
auto result = ParseApexLibrariesConfig(file_content, "jni");
ASSERT_FALSE(result.ok());
ASSERT_EQ("Invalid apex_namespace \"jni com.android.foo lib\"", result.error().message());
}
TEST(NativeLoaderApexLibrariesConfigParser, RejectInvalidLibraryList) {
const char file_content[] = R"(
# library list is ":" separated list of filenames
jni com_android_foo lib64/libfoo.so
)";
auto result = ParseApexLibrariesConfig(file_content, "jni");
ASSERT_FALSE(result.ok());
ASSERT_EQ("Invalid library_list \"jni com_android_foo lib64/libfoo.so\"", result.error().message());
}
} // namespace nativeloader
} // namespace android
#endif // defined(ART_TARGET_ANDROID)