runtime/native/java_lang_Class.cc - LeafOS-Project/android_art - Gitiles

 /*
  * 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 "class_linker.h"
 #include "common_throws.h"
 #include "dex_file-inl.h"
 #include "jni_internal.h"
 #include "nth_caller_visitor.h"
 #include "mirror/art_field-inl.h"
 #include "mirror/class-inl.h"
 #include "mirror/class_loader.h"
 #include "mirror/field-inl.h"
 #include "mirror/object-inl.h"
 #include "mirror/object_array-inl.h"
 #include "mirror/string-inl.h"
 #include "scoped_thread_state_change.h"
 #include "scoped_fast_native_object_access.h"
 #include "ScopedLocalRef.h"
 #include "ScopedUtfChars.h"
 #include "utf.h"
 #include "well_known_classes.h"

 namespace art {

 ALWAYS_INLINE static inline mirror::Class* DecodeClass(
     const ScopedFastNativeObjectAccess& soa, jobject java_class)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
   mirror::Class* c = soa.Decode<mirror::Class*>(java_class);
   DCHECK(c != NULL);
   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.Get() == 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 jobject Class_findOverriddenMethodIfProxy(JNIEnv* env, jclass, jobject art_method) {
   ScopedFastNativeObjectAccess soa(env);
   mirror::ArtMethod* method = soa.Decode<mirror::ArtMethod*>(art_method);
   mirror::Class* declaring_klass = method->GetDeclaringClass();
   if (!declaring_klass->IsProxyClass()) {
     return art_method;
   }
   uint32_t dex_method_index = method->GetDexMethodIndex();
   mirror::ArtMethod* overriden_method = method->GetDexCacheResolvedMethods()->Get(dex_method_index);
   return soa.AddLocalReference<jobject>(overriden_method);
 }

 static jstring Class_getNameNative(JNIEnv* env, jobject javaThis) {
   ScopedFastNativeObjectAccess soa(env);
   StackHandleScope<1> hs(soa.Self());
   mirror::Class* const c = DecodeClass(soa, javaThis);
   return soa.AddLocalReference<jstring>(mirror::Class::ComputeName(hs.NewHandle(c)));
 }

 static jobjectArray Class_getProxyInterfaces(JNIEnv* env, jobject javaThis) {
   ScopedFastNativeObjectAccess soa(env);
   mirror::Class* c = DecodeClass(soa, javaThis);
   return soa.AddLocalReference<jobjectArray>(c->GetInterfaces()->Clone(soa.Self()));
 }

 static mirror::ObjectArray<mirror::Field>* GetDeclaredFields(
     Thread* self, mirror::Class* klass, bool public_only, bool force_resolve)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
   StackHandleScope<3> hs(self);
   auto h_ifields = hs.NewHandle(klass->GetIFields());
   auto h_sfields = hs.NewHandle(klass->GetSFields());
   const int32_t num_ifields = h_ifields.Get() != nullptr ? h_ifields->GetLength() : 0;
   const int32_t num_sfields = h_sfields.Get() != nullptr ? h_sfields->GetLength() : 0;
   int32_t array_size = num_ifields + num_sfields;
   if (public_only) {
     // Lets go subtract all the non public fields.
     for (int32_t i = 0; i < num_ifields; ++i) {
       if (!h_ifields->GetWithoutChecks(i)->IsPublic()) {
         --array_size;
       }
     }
     for (int32_t i = 0; i < num_sfields; ++i) {
       if (!h_sfields->GetWithoutChecks(i)->IsPublic()) {
         --array_size;
       }
     }
   }
   int32_t array_idx = 0;
   auto object_array = hs.NewHandle(mirror::ObjectArray<mirror::Field>::Alloc(
       self, mirror::Field::ArrayClass(), array_size));
   if (object_array.Get() == nullptr) {
     return nullptr;
   }
   for (int32_t i = 0; i < num_ifields; ++i) {
     auto* art_field = h_ifields->GetWithoutChecks(i);
     if (!public_only || art_field->IsPublic()) {
       auto* field = mirror::Field::CreateFromArtField(self, art_field, force_resolve);
       if (field == nullptr) {
         if (kIsDebugBuild) {
           self->AssertPendingException();
         }
         // Maybe null due to OOME or type resolving exception.
         return nullptr;
       }
       object_array->SetWithoutChecks<false>(array_idx++, field);
     }
   }
   for (int32_t i = 0; i < num_sfields; ++i) {
     auto* art_field = h_sfields->GetWithoutChecks(i);
     if (!public_only || art_field->IsPublic()) {
       auto* field = mirror::Field::CreateFromArtField(self, art_field, force_resolve);
       if (field == nullptr) {
         if (kIsDebugBuild) {
           self->AssertPendingException();
         }
         return nullptr;
       }
       object_array->SetWithoutChecks<false>(array_idx++, field);
     }
   }
   CHECK_EQ(array_idx, array_size);
   return object_array.Get();
 }

 static jobjectArray Class_getDeclaredFieldsUnchecked(JNIEnv* env, jobject javaThis,
                                                      jboolean publicOnly) {
   ScopedFastNativeObjectAccess soa(env);
   return soa.AddLocalReference<jobjectArray>(
       GetDeclaredFields(soa.Self(), DecodeClass(soa, javaThis), publicOnly != JNI_FALSE, false));
 }

 static jobjectArray Class_getDeclaredFields(JNIEnv* env, jobject javaThis) {
   ScopedFastNativeObjectAccess soa(env);
   return soa.AddLocalReference<jobjectArray>(
       GetDeclaredFields(soa.Self(), DecodeClass(soa, javaThis), false, true));
 }

 static jobjectArray Class_getPublicDeclaredFields(JNIEnv* env, jobject javaThis) {
   ScopedFastNativeObjectAccess soa(env);
   return soa.AddLocalReference<jobjectArray>(
       GetDeclaredFields(soa.Self(), DecodeClass(soa, javaThis), true, 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 mirror::ArtField* FindFieldByName(
     Thread* self ATTRIBUTE_UNUSED, mirror::String* name,
     mirror::ObjectArray<mirror::ArtField>* fields)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
   uint32_t low = 0;
   uint32_t high = fields->GetLength();
   const uint16_t* const data = name->GetCharArray()->GetData() + name->GetOffset();
   const size_t length = name->GetLength();
   while (low < high) {
     auto mid = (low + high) / 2;
     mirror::ArtField* const field = fields->GetWithoutChecks(mid);
     int 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 (int32_t i = 0; i < fields->GetLength(); ++i) {
       CHECK_NE(fields->GetWithoutChecks(i)->GetName(), name->ToModifiedUtf8());
     }
   }
   return nullptr;
 }

 ALWAYS_INLINE static inline mirror::Field* GetDeclaredField(
     Thread* self, mirror::Class* c, mirror::String* name)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
   auto* instance_fields = c->GetIFields();
   if (instance_fields != nullptr) {
     auto* art_field = FindFieldByName(self, name, instance_fields);
     if (art_field != nullptr) {
       return mirror::Field::CreateFromArtField(self, art_field, true);
     }
   }
   auto* static_fields = c->GetSFields();
   if (static_fields != nullptr) {
     auto* art_field = FindFieldByName(self, name, static_fields);
     if (art_field != nullptr) {
       return mirror::Field::CreateFromArtField(self, art_field, true);
     }
   }
   return nullptr;
 }

 static jobject Class_getDeclaredFieldInternal(JNIEnv* env, jobject javaThis, jstring name) {
   ScopedFastNativeObjectAccess soa(env);
   auto* name_string = soa.Decode<mirror::String*>(name);
   return soa.AddLocalReference<jobject>(
       GetDeclaredField(soa.Self(), DecodeClass(soa, javaThis), name_string));
 }

 static jobject Class_getDeclaredField(JNIEnv* env, jobject javaThis, jstring name) {
   ScopedFastNativeObjectAccess soa(env);
   auto* name_string = soa.Decode<mirror::String*>(name);
   if (name == nullptr) {
     ThrowNullPointerException("name == null");
     return nullptr;
   }
   auto* klass = DecodeClass(soa, javaThis);
   mirror::Field* result = GetDeclaredField(soa.Self(), klass, name_string);
   if (result == nullptr) {
     std::string name_str = name_string->ToModifiedUtf8();
     // We may have a pending exception if we failed to resolve.
     if (!soa.Self()->IsExceptionPending()) {
       soa.Self()->ThrowNewException("Ljava/lang/NoSuchFieldException;", name_str.c_str());
     }
     return nullptr;
   }
   return soa.AddLocalReference<jobject>(result);
 }

 static JNINativeMethod gMethods[] = {
   NATIVE_METHOD(Class, classForName, "!(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;"),
   NATIVE_METHOD(Class, findOverriddenMethodIfProxy,
                 "!(Ljava/lang/reflect/ArtMethod;)Ljava/lang/reflect/ArtMethod;"),
   NATIVE_METHOD(Class, getNameNative, "!()Ljava/lang/String;"),
   NATIVE_METHOD(Class, getProxyInterfaces, "!()[Ljava/lang/Class;"),
   NATIVE_METHOD(Class, getDeclaredFields, "!()[Ljava/lang/reflect/Field;"),
   NATIVE_METHOD(Class, getPublicDeclaredFields, "!()[Ljava/lang/reflect/Field;"),
   NATIVE_METHOD(Class, getDeclaredFieldsUnchecked, "!(Z)[Ljava/lang/reflect/Field;"),
   NATIVE_METHOD(Class, getDeclaredFieldInternal, "!(Ljava/lang/String;)Ljava/lang/reflect/Field;"),
   NATIVE_METHOD(Class, getDeclaredField, "!(Ljava/lang/String;)Ljava/lang/reflect/Field;"),
 };

 void register_java_lang_Class(JNIEnv* env) {
   REGISTER_NATIVE_METHODS("java/lang/Class");
 }

 }  // namespace art
	/*
	* 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 "class_linker.h"
	#include "common_throws.h"
	#include "dex_file-inl.h"
	#include "jni_internal.h"
	#include "nth_caller_visitor.h"
	#include "mirror/art_field-inl.h"
	#include "mirror/class-inl.h"
	#include "mirror/class_loader.h"
	#include "mirror/field-inl.h"
	#include "mirror/object-inl.h"
	#include "mirror/object_array-inl.h"
	#include "mirror/string-inl.h"
	#include "scoped_thread_state_change.h"
	#include "scoped_fast_native_object_access.h"
	#include "ScopedLocalRef.h"
	#include "ScopedUtfChars.h"
	#include "utf.h"
	#include "well_known_classes.h"

	namespace art {

	ALWAYS_INLINE static inline mirror::Class* DecodeClass(
	const ScopedFastNativeObjectAccess& soa, jobject java_class)
	SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
	mirror::Class* c = soa.Decode<mirror::Class*>(java_class);
	DCHECK(c != NULL);
	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.Get() == 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 jobject Class_findOverriddenMethodIfProxy(JNIEnv* env, jclass, jobject art_method) {
	ScopedFastNativeObjectAccess soa(env);
	mirror::ArtMethod* method = soa.Decode<mirror::ArtMethod*>(art_method);
	mirror::Class* declaring_klass = method->GetDeclaringClass();
	if (!declaring_klass->IsProxyClass()) {
	return art_method;
	}
	uint32_t dex_method_index = method->GetDexMethodIndex();
	mirror::ArtMethod* overriden_method = method->GetDexCacheResolvedMethods()->Get(dex_method_index);
	return soa.AddLocalReference<jobject>(overriden_method);
	}

	static jstring Class_getNameNative(JNIEnv* env, jobject javaThis) {
	ScopedFastNativeObjectAccess soa(env);
	StackHandleScope<1> hs(soa.Self());
	mirror::Class* const c = DecodeClass(soa, javaThis);
	return soa.AddLocalReference<jstring>(mirror::Class::ComputeName(hs.NewHandle(c)));
	}

	static jobjectArray Class_getProxyInterfaces(JNIEnv* env, jobject javaThis) {
	ScopedFastNativeObjectAccess soa(env);
	mirror::Class* c = DecodeClass(soa, javaThis);
	return soa.AddLocalReference<jobjectArray>(c->GetInterfaces()->Clone(soa.Self()));
	}

	static mirror::ObjectArray<mirror::Field>* GetDeclaredFields(
	Thread* self, mirror::Class* klass, bool public_only, bool force_resolve)
	SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
	StackHandleScope<3> hs(self);
	auto h_ifields = hs.NewHandle(klass->GetIFields());
	auto h_sfields = hs.NewHandle(klass->GetSFields());
	const int32_t num_ifields = h_ifields.Get() != nullptr ? h_ifields->GetLength() : 0;
	const int32_t num_sfields = h_sfields.Get() != nullptr ? h_sfields->GetLength() : 0;
	int32_t array_size = num_ifields + num_sfields;
	if (public_only) {
	// Lets go subtract all the non public fields.
	for (int32_t i = 0; i < num_ifields; ++i) {
	if (!h_ifields->GetWithoutChecks(i)->IsPublic()) {
	--array_size;
	}
	}
	for (int32_t i = 0; i < num_sfields; ++i) {
	if (!h_sfields->GetWithoutChecks(i)->IsPublic()) {
	--array_size;
	}
	}
	}
	int32_t array_idx = 0;
	auto object_array = hs.NewHandle(mirror::ObjectArray<mirror::Field>::Alloc(
	self, mirror::Field::ArrayClass(), array_size));
	if (object_array.Get() == nullptr) {
	return nullptr;
	}
	for (int32_t i = 0; i < num_ifields; ++i) {
	auto* art_field = h_ifields->GetWithoutChecks(i);
	if (!public_only \|\| art_field->IsPublic()) {
	auto* field = mirror::Field::CreateFromArtField(self, art_field, force_resolve);
	if (field == nullptr) {
	if (kIsDebugBuild) {
	self->AssertPendingException();
	}
	// Maybe null due to OOME or type resolving exception.
	return nullptr;
	}
	object_array->SetWithoutChecks<false>(array_idx++, field);
	}
	}
	for (int32_t i = 0; i < num_sfields; ++i) {
	auto* art_field = h_sfields->GetWithoutChecks(i);
	if (!public_only \|\| art_field->IsPublic()) {
	auto* field = mirror::Field::CreateFromArtField(self, art_field, force_resolve);
	if (field == nullptr) {
	if (kIsDebugBuild) {
	self->AssertPendingException();
	}
	return nullptr;
	}
	object_array->SetWithoutChecks<false>(array_idx++, field);
	}
	}
	CHECK_EQ(array_idx, array_size);
	return object_array.Get();
	}

	static jobjectArray Class_getDeclaredFieldsUnchecked(JNIEnv* env, jobject javaThis,
	jboolean publicOnly) {
	ScopedFastNativeObjectAccess soa(env);
	return soa.AddLocalReference<jobjectArray>(
	GetDeclaredFields(soa.Self(), DecodeClass(soa, javaThis), publicOnly != JNI_FALSE, false));
	}

	static jobjectArray Class_getDeclaredFields(JNIEnv* env, jobject javaThis) {
	ScopedFastNativeObjectAccess soa(env);
	return soa.AddLocalReference<jobjectArray>(
	GetDeclaredFields(soa.Self(), DecodeClass(soa, javaThis), false, true));
	}

	static jobjectArray Class_getPublicDeclaredFields(JNIEnv* env, jobject javaThis) {
	ScopedFastNativeObjectAccess soa(env);
	return soa.AddLocalReference<jobjectArray>(
	GetDeclaredFields(soa.Self(), DecodeClass(soa, javaThis), true, 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 mirror::ArtField* FindFieldByName(
	Thread* self ATTRIBUTE_UNUSED, mirror::String* name,
	mirror::ObjectArray<mirror::ArtField>* fields)
	SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
	uint32_t low = 0;
	uint32_t high = fields->GetLength();
	const uint16_t* const data = name->GetCharArray()->GetData() + name->GetOffset();
	const size_t length = name->GetLength();
	while (low < high) {
	auto mid = (low + high) / 2;
	mirror::ArtField* const field = fields->GetWithoutChecks(mid);
	int 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 (int32_t i = 0; i < fields->GetLength(); ++i) {
	CHECK_NE(fields->GetWithoutChecks(i)->GetName(), name->ToModifiedUtf8());
	}
	}
	return nullptr;
	}

	ALWAYS_INLINE static inline mirror::Field* GetDeclaredField(
	Thread* self, mirror::Class* c, mirror::String* name)
	SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
	auto* instance_fields = c->GetIFields();
	if (instance_fields != nullptr) {
	auto* art_field = FindFieldByName(self, name, instance_fields);
	if (art_field != nullptr) {
	return mirror::Field::CreateFromArtField(self, art_field, true);
	}
	}
	auto* static_fields = c->GetSFields();
	if (static_fields != nullptr) {
	auto* art_field = FindFieldByName(self, name, static_fields);
	if (art_field != nullptr) {
	return mirror::Field::CreateFromArtField(self, art_field, true);
	}
	}
	return nullptr;
	}

	static jobject Class_getDeclaredFieldInternal(JNIEnv* env, jobject javaThis, jstring name) {
	ScopedFastNativeObjectAccess soa(env);
	auto* name_string = soa.Decode<mirror::String*>(name);
	return soa.AddLocalReference<jobject>(
	GetDeclaredField(soa.Self(), DecodeClass(soa, javaThis), name_string));
	}

	static jobject Class_getDeclaredField(JNIEnv* env, jobject javaThis, jstring name) {
	ScopedFastNativeObjectAccess soa(env);
	auto* name_string = soa.Decode<mirror::String*>(name);
	if (name == nullptr) {
	ThrowNullPointerException("name == null");
	return nullptr;
	}
	auto* klass = DecodeClass(soa, javaThis);
	mirror::Field* result = GetDeclaredField(soa.Self(), klass, name_string);
	if (result == nullptr) {
	std::string name_str = name_string->ToModifiedUtf8();
	// We may have a pending exception if we failed to resolve.
	if (!soa.Self()->IsExceptionPending()) {
	soa.Self()->ThrowNewException("Ljava/lang/NoSuchFieldException;", name_str.c_str());
	}
	return nullptr;
	}
	return soa.AddLocalReference<jobject>(result);
	}

	static JNINativeMethod gMethods[] = {
	NATIVE_METHOD(Class, classForName, "!(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;"),
	NATIVE_METHOD(Class, findOverriddenMethodIfProxy,
	"!(Ljava/lang/reflect/ArtMethod;)Ljava/lang/reflect/ArtMethod;"),
	NATIVE_METHOD(Class, getNameNative, "!()Ljava/lang/String;"),
	NATIVE_METHOD(Class, getProxyInterfaces, "!()[Ljava/lang/Class;"),
	NATIVE_METHOD(Class, getDeclaredFields, "!()[Ljava/lang/reflect/Field;"),
	NATIVE_METHOD(Class, getPublicDeclaredFields, "!()[Ljava/lang/reflect/Field;"),
	NATIVE_METHOD(Class, getDeclaredFieldsUnchecked, "!(Z)[Ljava/lang/reflect/Field;"),
	NATIVE_METHOD(Class, getDeclaredFieldInternal, "!(Ljava/lang/String;)Ljava/lang/reflect/Field;"),
	NATIVE_METHOD(Class, getDeclaredField, "!(Ljava/lang/String;)Ljava/lang/reflect/Field;"),
	};

	void register_java_lang_Class(JNIEnv* env) {
	REGISTER_NATIVE_METHODS("java/lang/Class");
	}

	} // namespace art