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android13/art/runtime/native/java_lang_Class.cc

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/*
* Copyright (C) 2008 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.
*/
#include "java_lang_Class.h"
#include <iostream>
#include "art_field-inl.h"
#include "art_method-inl.h"
#include "base/enums.h"
#include "class_linker-inl.h"
#include "class_root-inl.h"
#include "common_throws.h"
#include "compat_framework.h"
#include "dex/descriptors_names.h"
#include "dex/dex_file-inl.h"
#include "dex/dex_file_annotations.h"
#include "dex/utf.h"
#include "hidden_api.h"
#include "jni/jni_internal.h"
#include "mirror/class-alloc-inl.h"
#include "mirror/class-inl.h"
#include "mirror/class_loader.h"
#include "mirror/field.h"
#include "mirror/method.h"
#include "mirror/method_handles_lookup.h"
#include "mirror/object-inl.h"
#include "mirror/object_array-alloc-inl.h"
#include "mirror/object_array-inl.h"
#include "mirror/proxy.h"
#include "mirror/string-alloc-inl.h"
#include "mirror/string-inl.h"
#include "native_util.h"
#include "nativehelper/jni_macros.h"
#include "nativehelper/scoped_local_ref.h"
#include "nativehelper/scoped_utf_chars.h"
#include "nth_caller_visitor.h"
#include "obj_ptr-inl.h"
#include "reflection.h"
#include "reflective_handle_scope-inl.h"
#include "scoped_fast_native_object_access-inl.h"
#include "scoped_thread_state_change-inl.h"
#include "well_known_classes.h"
namespace art {
static std::function<hiddenapi::AccessContext()> GetHiddenapiAccessContextFunction(Thread* self) {
return [=]() REQUIRES_SHARED(Locks::mutator_lock_) {
return hiddenapi::GetReflectionCallerAccessContext(self);
};
}
// Returns true if the first non-ClassClass caller up the stack should not be
// allowed access to `member`.
template<typename T>
ALWAYS_INLINE static bool ShouldDenyAccessToMember(T* member, Thread* self)
REQUIRES_SHARED(Locks::mutator_lock_) {
return hiddenapi::ShouldDenyAccessToMember(member,
GetHiddenapiAccessContextFunction(self),
hiddenapi::AccessMethod::kReflection);
}
ALWAYS_INLINE static inline ObjPtr<mirror::Class> DecodeClass(
const ScopedFastNativeObjectAccess& soa, jobject java_class)
REQUIRES_SHARED(Locks::mutator_lock_) {
ObjPtr<mirror::Class> c = soa.Decode<mirror::Class>(java_class);
DCHECK(c != nullptr);
DCHECK(c->IsClass());
// TODO: we could EnsureInitialized here, rather than on every reflective get/set or invoke .
// For now, we conservatively preserve the old dalvik behavior. A quick "IsInitialized" check
// every time probably doesn't make much difference to reflection performance anyway.
return c;
}
// "name" is in "binary name" format, e.g. "dalvik.system.Debug$1".
static jclass Class_classForName(JNIEnv* env, jclass, jstring javaName, jboolean initialize,
jobject javaLoader) {
ScopedFastNativeObjectAccess soa(env);
ScopedUtfChars name(env, javaName);
if (name.c_str() == nullptr) {
return nullptr;
}
// We need to validate and convert the name (from x.y.z to x/y/z). This
// is especially handy for array types, since we want to avoid
// auto-generating bogus array classes.
if (!IsValidBinaryClassName(name.c_str())) {
soa.Self()->ThrowNewExceptionF("Ljava/lang/ClassNotFoundException;",
"Invalid name: %s", name.c_str());
return nullptr;
}
std::string descriptor(DotToDescriptor(name.c_str()));
StackHandleScope<2> hs(soa.Self());
Handle<mirror::ClassLoader> class_loader(
hs.NewHandle(soa.Decode<mirror::ClassLoader>(javaLoader)));
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
Handle<mirror::Class> c(
hs.NewHandle(class_linker->FindClass(soa.Self(), descriptor.c_str(), class_loader)));
if (c == nullptr) {
ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred());
env->ExceptionClear();
jthrowable cnfe = reinterpret_cast<jthrowable>(
env->NewObject(WellKnownClasses::java_lang_ClassNotFoundException,
WellKnownClasses::java_lang_ClassNotFoundException_init,
javaName,
cause.get()));
if (cnfe != nullptr) {
// Make sure allocation didn't fail with an OOME.
env->Throw(cnfe);
}
return nullptr;
}
if (initialize) {
class_linker->EnsureInitialized(soa.Self(), c, true, true);
}
return soa.AddLocalReference<jclass>(c.Get());
}
static jclass Class_getPrimitiveClass(JNIEnv* env, jclass, jstring name) {
ScopedFastNativeObjectAccess soa(env);
ObjPtr<mirror::Class> klass = mirror::Class::GetPrimitiveClass(soa.Decode<mirror::String>(name));
return soa.AddLocalReference<jclass>(klass);
}
static jstring Class_getNameNative(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
ObjPtr<mirror::Class> c = DecodeClass(soa, javaThis);
return soa.AddLocalReference<jstring>(mirror::Class::ComputeName(hs.NewHandle(c)));
}
static jobjectArray Class_getInterfacesInternal(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass = hs.NewHandle(DecodeClass(soa, javaThis));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
if (klass->IsProxyClass()) {
StackHandleScope<1> hs2(soa.Self());
Handle<mirror::ObjectArray<mirror::Class>> interfaces =
hs2.NewHandle(klass->GetProxyInterfaces());
return soa.AddLocalReference<jobjectArray>(
mirror::ObjectArray<mirror::Class>::Clone(interfaces, soa.Self()));
}
const dex::TypeList* iface_list = klass->GetInterfaceTypeList();
if (iface_list == nullptr) {
return nullptr;
}
ClassLinker* linker = Runtime::Current()->GetClassLinker();
const uint32_t num_ifaces = iface_list->Size();
ObjPtr<mirror::Class> class_array_class =
GetClassRoot<mirror::ObjectArray<mirror::Class>>(linker);
ObjPtr<mirror::ObjectArray<mirror::Class>> ifaces =
mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, num_ifaces);
if (ifaces.IsNull()) {
DCHECK(soa.Self()->IsExceptionPending());
return nullptr;
}
// Check that we aren't in an active transaction, we call SetWithoutChecks
// with kActiveTransaction == false.
DCHECK(!Runtime::Current()->IsActiveTransaction());
for (uint32_t i = 0; i < num_ifaces; ++i) {
const dex::TypeIndex type_idx = iface_list->GetTypeItem(i).type_idx_;
ObjPtr<mirror::Class> interface = linker->LookupResolvedType(type_idx, klass.Get());
DCHECK(interface != nullptr);
ifaces->SetWithoutChecks<false>(i, interface);
}
return soa.AddLocalReference<jobjectArray>(ifaces);
}
static jobjectArray Class_getDeclaredFieldsUnchecked(JNIEnv* env, jobject javaThis,
jboolean publicOnly) {
ScopedFastNativeObjectAccess soa(env);
ObjPtr<mirror::Class> klass = DecodeClass(soa, javaThis);
return soa.AddLocalReference<jobjectArray>(
klass->GetDeclaredFields(soa.Self(),
publicOnly != JNI_FALSE,
/*force_resolve=*/ false));
}
static jobjectArray Class_getDeclaredFields(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
ObjPtr<mirror::Class> klass = DecodeClass(soa, javaThis);
return soa.AddLocalReference<jobjectArray>(
klass->GetDeclaredFields(soa.Self(),
/*public_only=*/ false,
/*force_resolve=*/ true));
}
static jobjectArray Class_getPublicDeclaredFields(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
ObjPtr<mirror::Class> klass = DecodeClass(soa, javaThis);
return soa.AddLocalReference<jobjectArray>(
klass->GetDeclaredFields(soa.Self(),
/*public_only=*/ true,
/*force_resolve=*/ true));
}
// Performs a binary search through an array of fields, TODO: Is this fast enough if we don't use
// the dex cache for lookups? I think CompareModifiedUtf8ToUtf16AsCodePointValues should be fairly
// fast.
ALWAYS_INLINE static inline ArtField* FindFieldByName(ObjPtr<mirror::String> name,
LengthPrefixedArray<ArtField>* fields)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (fields == nullptr) {
return nullptr;
}
size_t low = 0;
size_t high = fields->size();
const bool is_name_compressed = name->IsCompressed();
const uint16_t* const data = (is_name_compressed) ? nullptr : name->GetValue();
const uint8_t* const data_compressed = (is_name_compressed) ? name->GetValueCompressed()
: nullptr;
const size_t length = name->GetLength();
while (low < high) {
auto mid = (low + high) / 2;
ArtField& field = fields->At(mid);
int result = 0;
if (is_name_compressed) {
size_t field_length = strlen(field.GetName());
size_t min_size = (length < field_length) ? length : field_length;
result = memcmp(field.GetName(), data_compressed, min_size);
if (result == 0) {
result = field_length - length;
}
} else {
result = CompareModifiedUtf8ToUtf16AsCodePointValues(field.GetName(), data, length);
}
// Alternate approach, only a few % faster at the cost of more allocations.
// int result = field->GetStringName(self, true)->CompareTo(name);
if (result < 0) {
low = mid + 1;
} else if (result > 0) {
high = mid;
} else {
return &field;
}
}
if (kIsDebugBuild) {
for (ArtField& field : MakeIterationRangeFromLengthPrefixedArray(fields)) {
CHECK_NE(field.GetName(), name->ToModifiedUtf8());
}
}
return nullptr;
}
ALWAYS_INLINE static inline ObjPtr<mirror::Field> GetDeclaredField(Thread* self,
ObjPtr<mirror::Class> c,
ObjPtr<mirror::String> name)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (UNLIKELY(c->IsObsoleteObject())) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
ArtField* art_field = FindFieldByName(name, c->GetIFieldsPtr());
if (art_field != nullptr) {
return mirror::Field::CreateFromArtField(self, art_field, true);
}
art_field = FindFieldByName(name, c->GetSFieldsPtr());
if (art_field != nullptr) {
return mirror::Field::CreateFromArtField(self, art_field, true);
}
return nullptr;
}
static ObjPtr<mirror::Field> GetPublicFieldRecursive(
Thread* self, ObjPtr<mirror::Class> clazz, ObjPtr<mirror::String> name)
REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK(clazz != nullptr);
DCHECK(name != nullptr);
DCHECK(self != nullptr);
if (UNLIKELY(clazz->IsObsoleteObject())) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
StackHandleScope<2> hs(self);
MutableHandle<mirror::Class> h_clazz(hs.NewHandle(clazz));
Handle<mirror::String> h_name(hs.NewHandle(name));
// We search the current class, its direct interfaces then its superclass.
while (h_clazz != nullptr) {
ObjPtr<mirror::Field> result = GetDeclaredField(self, h_clazz.Get(), h_name.Get());
if ((result != nullptr) && (result->GetAccessFlags() & kAccPublic)) {
return result;
} else if (UNLIKELY(self->IsExceptionPending())) {
// Something went wrong. Bail out.
return nullptr;
}
uint32_t num_direct_interfaces = h_clazz->NumDirectInterfaces();
for (uint32_t i = 0; i < num_direct_interfaces; i++) {
ObjPtr<mirror::Class> iface = mirror::Class::ResolveDirectInterface(self, h_clazz, i);
if (UNLIKELY(iface == nullptr)) {
self->AssertPendingException();
return nullptr;
}
result = GetPublicFieldRecursive(self, iface, h_name.Get());
if (result != nullptr) {
DCHECK(result->GetAccessFlags() & kAccPublic);
return result;
} else if (UNLIKELY(self->IsExceptionPending())) {
// Something went wrong. Bail out.
return nullptr;
}
}
// We don't try the superclass if we are an interface.
if (h_clazz->IsInterface()) {
break;
}
// Get the next class.
h_clazz.Assign(h_clazz->GetSuperClass());
}
return nullptr;
}
static jobject Class_getPublicFieldRecursive(JNIEnv* env, jobject javaThis, jstring name) {
ScopedFastNativeObjectAccess soa(env);
auto name_string = soa.Decode<mirror::String>(name);
if (UNLIKELY(name_string == nullptr)) {
ThrowNullPointerException("name == null");
return nullptr;
}
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Field> field = hs.NewHandle(GetPublicFieldRecursive(
soa.Self(), DecodeClass(soa, javaThis), name_string));
if (field.Get() == nullptr || ShouldDenyAccessToMember(field->GetArtField(), soa.Self())) {
return nullptr;
}
return soa.AddLocalReference<jobject>(field.Get());
}
static jobject Class_getDeclaredField(JNIEnv* env, jobject javaThis, jstring name) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<3> hs(soa.Self());
Handle<mirror::String> h_string = hs.NewHandle(soa.Decode<mirror::String>(name));
if (h_string == nullptr) {
ThrowNullPointerException("name == null");
return nullptr;
}
Handle<mirror::Class> h_klass = hs.NewHandle(DecodeClass(soa, javaThis));
Handle<mirror::Field> result =
hs.NewHandle(GetDeclaredField(soa.Self(), h_klass.Get(), h_string.Get()));
if (result == nullptr || ShouldDenyAccessToMember(result->GetArtField(), soa.Self())) {
std::string name_str = h_string->ToModifiedUtf8();
if (name_str == "value" && h_klass->IsStringClass()) {
// We log the error for this specific case, as the user might just swallow the exception.
// This helps diagnose crashes when applications rely on the String#value field being
// there.
// Also print on the error stream to test it through run-test.
std::string message("The String#value field is not present on Android versions >= 6.0");
LOG(ERROR) << message;
std::cerr << message << std::endl;
}
// We may have a pending exception if we failed to resolve.
if (!soa.Self()->IsExceptionPending()) {
ThrowNoSuchFieldException(h_klass.Get(), name_str.c_str());
}
return nullptr;
}
return soa.AddLocalReference<jobject>(result.Get());
}
static jobject Class_getDeclaredConstructorInternal(
JNIEnv* env, jobject javaThis, jobjectArray args) {
ScopedFastNativeObjectAccess soa(env);
DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
DCHECK(!Runtime::Current()->IsActiveTransaction());
StackHandleScope<1> hs(soa.Self());
ObjPtr<mirror::Class> klass = DecodeClass(soa, javaThis);
if (UNLIKELY(klass->IsObsoleteObject())) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
Handle<mirror::Constructor> result = hs.NewHandle(
mirror::Class::GetDeclaredConstructorInternal<kRuntimePointerSize>(
soa.Self(),
klass,
soa.Decode<mirror::ObjectArray<mirror::Class>>(args)));
if (result == nullptr || ShouldDenyAccessToMember(result->GetArtMethod(), soa.Self())) {
return nullptr;
}
return soa.AddLocalReference<jobject>(result.Get());
}
static ALWAYS_INLINE inline bool MethodMatchesConstructor(
ArtMethod* m,
bool public_only,
const hiddenapi::AccessContext& hiddenapi_context) REQUIRES_SHARED(Locks::mutator_lock_) {
DCHECK(m != nullptr);
return m->IsConstructor() &&
!m->IsStatic() &&
mirror::Class::IsDiscoverable(public_only, hiddenapi_context, m);
}
static jobjectArray Class_getDeclaredConstructorsInternal(
JNIEnv* env, jobject javaThis, jboolean publicOnly) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<2> hs(soa.Self());
bool public_only = (publicOnly != JNI_FALSE);
auto hiddenapi_context = hiddenapi::GetReflectionCallerAccessContext(soa.Self());
Handle<mirror::Class> h_klass = hs.NewHandle(DecodeClass(soa, javaThis));
if (UNLIKELY(h_klass->IsObsoleteObject())) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
size_t constructor_count = 0;
// Two pass approach for speed.
for (auto& m : h_klass->GetDirectMethods(kRuntimePointerSize)) {
constructor_count += MethodMatchesConstructor(&m, public_only, hiddenapi_context) ? 1u : 0u;
}
auto h_constructors = hs.NewHandle(mirror::ObjectArray<mirror::Constructor>::Alloc(
soa.Self(), GetClassRoot<mirror::ObjectArray<mirror::Constructor>>(), constructor_count));
if (UNLIKELY(h_constructors == nullptr)) {
soa.Self()->AssertPendingException();
return nullptr;
}
constructor_count = 0;
for (auto& m : h_klass->GetDirectMethods(kRuntimePointerSize)) {
if (MethodMatchesConstructor(&m, public_only, hiddenapi_context)) {
DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
DCHECK(!Runtime::Current()->IsActiveTransaction());
ObjPtr<mirror::Constructor> constructor =
mirror::Constructor::CreateFromArtMethod<kRuntimePointerSize>(soa.Self(), &m);
if (UNLIKELY(constructor == nullptr)) {
soa.Self()->AssertPendingOOMException();
return nullptr;
}
h_constructors->SetWithoutChecks<false>(constructor_count++, constructor);
}
}
return soa.AddLocalReference<jobjectArray>(h_constructors.Get());
}
static jobject Class_getDeclaredMethodInternal(JNIEnv* env, jobject javaThis,
jstring name, jobjectArray args) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
DCHECK(!Runtime::Current()->IsActiveTransaction());
ObjPtr<mirror::Class> klass = DecodeClass(soa, javaThis);
if (UNLIKELY(klass->IsObsoleteObject())) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
Handle<mirror::Method> result = hs.NewHandle(
mirror::Class::GetDeclaredMethodInternal<kRuntimePointerSize>(
soa.Self(),
klass,
soa.Decode<mirror::String>(name),
soa.Decode<mirror::ObjectArray<mirror::Class>>(args),
GetHiddenapiAccessContextFunction(soa.Self())));
if (result == nullptr || ShouldDenyAccessToMember(result->GetArtMethod(), soa.Self())) {
return nullptr;
}
return soa.AddLocalReference<jobject>(result.Get());
}
static jobjectArray Class_getDeclaredMethodsUnchecked(JNIEnv* env, jobject javaThis,
jboolean publicOnly) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<2> hs(soa.Self());
auto hiddenapi_context = hiddenapi::GetReflectionCallerAccessContext(soa.Self());
bool public_only = (publicOnly != JNI_FALSE);
Handle<mirror::Class> klass = hs.NewHandle(DecodeClass(soa, javaThis));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
size_t num_methods = 0;
for (ArtMethod& m : klass->GetDeclaredMethods(kRuntimePointerSize)) {
uint32_t modifiers = m.GetAccessFlags();
// Add non-constructor declared methods.
if ((modifiers & kAccConstructor) == 0 &&
mirror::Class::IsDiscoverable(public_only, hiddenapi_context, &m)) {
++num_methods;
}
}
auto ret = hs.NewHandle(mirror::ObjectArray<mirror::Method>::Alloc(
soa.Self(), GetClassRoot<mirror::ObjectArray<mirror::Method>>(), num_methods));
if (ret == nullptr) {
soa.Self()->AssertPendingOOMException();
return nullptr;
}
num_methods = 0;
for (ArtMethod& m : klass->GetDeclaredMethods(kRuntimePointerSize)) {
uint32_t modifiers = m.GetAccessFlags();
if ((modifiers & kAccConstructor) == 0 &&
mirror::Class::IsDiscoverable(public_only, hiddenapi_context, &m)) {
DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);
DCHECK(!Runtime::Current()->IsActiveTransaction());
ObjPtr<mirror::Method> method =
mirror::Method::CreateFromArtMethod<kRuntimePointerSize>(soa.Self(), &m);
if (method == nullptr) {
soa.Self()->AssertPendingException();
return nullptr;
}
ret->SetWithoutChecks<false>(num_methods++, method);
}
}
return soa.AddLocalReference<jobjectArray>(ret.Get());
}
static jobject Class_getDeclaredAnnotation(JNIEnv* env, jobject javaThis, jclass annotationClass) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<2> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
// Handle public contract to throw NPE if the "annotationClass" argument was null.
if (UNLIKELY(annotationClass == nullptr)) {
ThrowNullPointerException("annotationClass");
return nullptr;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
return nullptr;
}
Handle<mirror::Class> annotation_class(hs.NewHandle(soa.Decode<mirror::Class>(annotationClass)));
return soa.AddLocalReference<jobject>(
annotations::GetAnnotationForClass(klass, annotation_class));
}
static jobjectArray Class_getDeclaredAnnotations(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
// Return an empty array instead of a null pointer.
ObjPtr<mirror::Class> annotation_array_class =
soa.Decode<mirror::Class>(WellKnownClasses::java_lang_annotation_Annotation__array);
ObjPtr<mirror::ObjectArray<mirror::Object>> empty_array =
mirror::ObjectArray<mirror::Object>::Alloc(soa.Self(),
annotation_array_class,
/* length= */ 0);
return soa.AddLocalReference<jobjectArray>(empty_array);
}
return soa.AddLocalReference<jobjectArray>(annotations::GetAnnotationsForClass(klass));
}
static jobjectArray Class_getDeclaredClasses(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
ObjPtr<mirror::ObjectArray<mirror::Class>> classes = nullptr;
if (!klass->IsProxyClass() && klass->GetDexCache() != nullptr) {
classes = annotations::GetDeclaredClasses(klass);
}
if (classes == nullptr) {
// Return an empty array instead of a null pointer.
if (soa.Self()->IsExceptionPending()) {
// Pending exception from GetDeclaredClasses.
return nullptr;
}
ObjPtr<mirror::Class> class_array_class = GetClassRoot<mirror::ObjectArray<mirror::Class>>();
DCHECK(class_array_class != nullptr);
ObjPtr<mirror::ObjectArray<mirror::Class>> empty_array =
mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, 0);
return soa.AddLocalReference<jobjectArray>(empty_array);
}
return soa.AddLocalReference<jobjectArray>(classes);
}
static jclass Class_getEnclosingClass(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
return nullptr;
}
return soa.AddLocalReference<jclass>(annotations::GetEnclosingClass(klass));
}
static jobject Class_getEnclosingConstructorNative(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
return nullptr;
}
ObjPtr<mirror::Object> method = annotations::GetEnclosingMethod(klass);
if (method != nullptr) {
if (GetClassRoot<mirror::Constructor>() == method->GetClass()) {
return soa.AddLocalReference<jobject>(method);
}
}
return nullptr;
}
static jobject Class_getEnclosingMethodNative(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
return nullptr;
}
ObjPtr<mirror::Object> method = annotations::GetEnclosingMethod(klass);
if (method != nullptr) {
if (GetClassRoot<mirror::Method>() == method->GetClass()) {
return soa.AddLocalReference<jobject>(method);
}
}
return nullptr;
}
static jint Class_getInnerClassFlags(JNIEnv* env, jobject javaThis, jint defaultValue) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return 0;
}
return mirror::Class::GetInnerClassFlags(klass, defaultValue);
}
static jstring Class_getInnerClassName(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
return nullptr;
}
ObjPtr<mirror::String> class_name = nullptr;
if (!annotations::GetInnerClass(klass, &class_name)) {
return nullptr;
}
return soa.AddLocalReference<jstring>(class_name);
}
static jobjectArray Class_getSignatureAnnotation(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
return nullptr;
}
return soa.AddLocalReference<jobjectArray>(
annotations::GetSignatureAnnotationForClass(klass));
}
static jboolean Class_isAnonymousClass(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return 0;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
return false;
}
ObjPtr<mirror::String> class_name = nullptr;
if (!annotations::GetInnerClass(klass, &class_name)) {
return false;
}
return class_name == nullptr;
}
static jboolean Class_isDeclaredAnnotationPresent(JNIEnv* env, jobject javaThis,
jclass annotationType) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<2> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return false;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
return false;
}
Handle<mirror::Class> annotation_class(hs.NewHandle(soa.Decode<mirror::Class>(annotationType)));
return annotations::IsClassAnnotationPresent(klass, annotation_class);
}
static jclass Class_getDeclaringClass(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis)));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) {
return nullptr;
}
// Return null for anonymous classes.
if (Class_isAnonymousClass(env, javaThis)) {
return nullptr;
}
return soa.AddLocalReference<jclass>(annotations::GetDeclaringClass(klass));
}
static jobject Class_newInstance(JNIEnv* env, jobject javaThis) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<4> hs(soa.Self());
Handle<mirror::Class> klass = hs.NewHandle(DecodeClass(soa, javaThis));
if (klass->IsObsoleteObject()) {
ThrowRuntimeException("Obsolete Object!");
return nullptr;
}
if (UNLIKELY(klass->GetPrimitiveType() != 0 || klass->IsInterface() || klass->IsArrayClass() ||
klass->IsAbstract())) {
soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;",
"%s cannot be instantiated",
klass->PrettyClass().c_str());
return nullptr;
}
auto caller = hs.NewHandle<mirror::Class>(nullptr);
// Verify that we can access the class.
if (!klass->IsPublic()) {
caller.Assign(GetCallingClass(soa.Self(), 1));
if (caller != nullptr && !caller->CanAccess(klass.Get())) {
soa.Self()->ThrowNewExceptionF(
"Ljava/lang/IllegalAccessException;", "%s is not accessible from %s",
klass->PrettyClass().c_str(), caller->PrettyClass().c_str());
return nullptr;
}
}
StackArtMethodHandleScope<1> mhs(soa.Self());
ReflectiveHandle<ArtMethod> constructor(mhs.NewMethodHandle(klass->GetDeclaredConstructor(
soa.Self(), ScopedNullHandle<mirror::ObjectArray<mirror::Class>>(), kRuntimePointerSize)));
if (UNLIKELY(constructor == nullptr) || ShouldDenyAccessToMember(constructor.Get(), soa.Self())) {
soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;",
"%s has no zero argument constructor",
klass->PrettyClass().c_str());
return nullptr;
}
// Invoke the string allocator to return an empty string for the string class.
if (klass->IsStringClass()) {
gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator();
ObjPtr<mirror::Object> obj = mirror::String::AllocEmptyString(soa.Self(), allocator_type);
if (UNLIKELY(soa.Self()->IsExceptionPending())) {
return nullptr;
} else {
return soa.AddLocalReference<jobject>(obj);
}
}
auto receiver = hs.NewHandle(klass->AllocObject(soa.Self()));
if (UNLIKELY(receiver == nullptr)) {
soa.Self()->AssertPendingOOMException();
return nullptr;
}
// Verify that we can access the constructor.
ObjPtr<mirror::Class> declaring_class = constructor->GetDeclaringClass();
if (!constructor->IsPublic()) {
if (caller == nullptr) {
caller.Assign(GetCallingClass(soa.Self(), 1));
}
if (UNLIKELY(caller != nullptr && !VerifyAccess(receiver.Get(),
declaring_class,
constructor->GetAccessFlags(),
caller.Get()))) {
soa.Self()->ThrowNewExceptionF(
"Ljava/lang/IllegalAccessException;", "%s is not accessible from %s",
constructor->PrettyMethod().c_str(), caller->PrettyClass().c_str());
return nullptr;
}
}
// Ensure that we are initialized.
if (UNLIKELY(!declaring_class->IsVisiblyInitialized())) {
Thread* self = soa.Self();
Handle<mirror::Class> h_class = hs.NewHandle(declaring_class);
if (UNLIKELY(!Runtime::Current()->GetClassLinker()->EnsureInitialized(
self, h_class, /*can_init_fields=*/ true, /*can_init_parents=*/ true))) {
DCHECK(self->IsExceptionPending());
return nullptr;
}
DCHECK(h_class->IsInitializing());
}
// Invoke the constructor.
JValue result;
uint32_t args[1] = { static_cast<uint32_t>(reinterpret_cast<uintptr_t>(receiver.Get())) };
constructor->Invoke(soa.Self(), args, sizeof(args), &result, "V");
if (UNLIKELY(soa.Self()->IsExceptionPending())) {
return nullptr;
}
// Constructors are ()V methods, so we shouldn't touch the result of InvokeMethod.
return soa.AddLocalReference<jobject>(receiver.Get());
}
static JNINativeMethod gMethods[] = {
FAST_NATIVE_METHOD(Class, classForName,
"(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;"),
FAST_NATIVE_METHOD(Class, getDeclaredAnnotation,
"(Ljava/lang/Class;)Ljava/lang/annotation/Annotation;"),
FAST_NATIVE_METHOD(Class, getDeclaredAnnotations, "()[Ljava/lang/annotation/Annotation;"),
FAST_NATIVE_METHOD(Class, getDeclaredClasses, "()[Ljava/lang/Class;"),
FAST_NATIVE_METHOD(Class, getDeclaredConstructorInternal,
"([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;"),
FAST_NATIVE_METHOD(Class, getDeclaredConstructorsInternal, "(Z)[Ljava/lang/reflect/Constructor;"),
FAST_NATIVE_METHOD(Class, getDeclaredField, "(Ljava/lang/String;)Ljava/lang/reflect/Field;"),
FAST_NATIVE_METHOD(Class, getPublicFieldRecursive, "(Ljava/lang/String;)Ljava/lang/reflect/Field;"),
FAST_NATIVE_METHOD(Class, getDeclaredFields, "()[Ljava/lang/reflect/Field;"),
FAST_NATIVE_METHOD(Class, getDeclaredFieldsUnchecked, "(Z)[Ljava/lang/reflect/Field;"),
FAST_NATIVE_METHOD(Class, getDeclaredMethodInternal,
"(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;"),
FAST_NATIVE_METHOD(Class, getDeclaredMethodsUnchecked,
"(Z)[Ljava/lang/reflect/Method;"),
FAST_NATIVE_METHOD(Class, getDeclaringClass, "()Ljava/lang/Class;"),
FAST_NATIVE_METHOD(Class, getEnclosingClass, "()Ljava/lang/Class;"),
FAST_NATIVE_METHOD(Class, getEnclosingConstructorNative, "()Ljava/lang/reflect/Constructor;"),
FAST_NATIVE_METHOD(Class, getEnclosingMethodNative, "()Ljava/lang/reflect/Method;"),
FAST_NATIVE_METHOD(Class, getInnerClassFlags, "(I)I"),
FAST_NATIVE_METHOD(Class, getInnerClassName, "()Ljava/lang/String;"),
FAST_NATIVE_METHOD(Class, getInterfacesInternal, "()[Ljava/lang/Class;"),
FAST_NATIVE_METHOD(Class, getPrimitiveClass, "(Ljava/lang/String;)Ljava/lang/Class;"),
FAST_NATIVE_METHOD(Class, getNameNative, "()Ljava/lang/String;"),
FAST_NATIVE_METHOD(Class, getPublicDeclaredFields, "()[Ljava/lang/reflect/Field;"),
FAST_NATIVE_METHOD(Class, getSignatureAnnotation, "()[Ljava/lang/String;"),
FAST_NATIVE_METHOD(Class, isAnonymousClass, "()Z"),
FAST_NATIVE_METHOD(Class, isDeclaredAnnotationPresent, "(Ljava/lang/Class;)Z"),
FAST_NATIVE_METHOD(Class, newInstance, "()Ljava/lang/Object;"),
};
void register_java_lang_Class(JNIEnv* env) {
REGISTER_NATIVE_METHODS("java/lang/Class");
}
} // namespace art
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