runtime/native/java_lang_reflect_Constructor.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_reflect_Constructor.h"

 #include "art_method-inl.h"
 #include "base/enums.h"
 #include "class_linker.h"
 #include "class_linker-inl.h"
 #include "jni_internal.h"
 #include "mirror/class-inl.h"
 #include "mirror/method.h"
 #include "mirror/object-inl.h"
 #include "reflection.h"
 #include "scoped_fast_native_object_access.h"
 #include "well_known_classes.h"

 namespace art {

 static jobject Constructor_getAnnotationNative(JNIEnv* env, jobject javaMethod,
                                                jclass annotationType) {
   ScopedFastNativeObjectAccess soa(env);
   StackHandleScope<1> hs(soa.Self());
   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
   if (method->IsProxyMethod()) {
     return nullptr;
   } else {
     Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class*>(annotationType)));
     return soa.AddLocalReference<jobject>(
         method->GetDexFile()->GetAnnotationForMethod(method, klass));
   }
 }

 static jobjectArray Constructor_getDeclaredAnnotations(JNIEnv* env, jobject javaMethod) {
   ScopedFastNativeObjectAccess soa(env);
   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
   if (method->IsProxyMethod()) {
     mirror::Class* class_class = mirror::Class::GetJavaLangClass();
     mirror::Class* class_array_class =
         Runtime::Current()->GetClassLinker()->FindArrayClass(soa.Self(), &class_class);
     if (class_array_class == nullptr) {
       return nullptr;
     }
     mirror::ObjectArray<mirror::Class>* empty_array =
         mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, 0);
     return soa.AddLocalReference<jobjectArray>(empty_array);
   } else {
     return soa.AddLocalReference<jobjectArray>(
         method->GetDexFile()->GetAnnotationsForMethod(method));
   }
 }

 static jobjectArray Constructor_getExceptionTypes(JNIEnv* env, jobject javaMethod) {
   ScopedFastNativeObjectAccess soa(env);
   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod)
       ->GetInterfaceMethodIfProxy(kRuntimePointerSize);
   mirror::ObjectArray<mirror::Class>* result_array =
       method->GetDexFile()->GetExceptionTypesForMethod(method);
   if (result_array == nullptr) {
     // Return an empty array instead of a null pointer.
     mirror::Class* class_class = mirror::Class::GetJavaLangClass();
     mirror::Class* class_array_class =
         Runtime::Current()->GetClassLinker()->FindArrayClass(soa.Self(), &class_class);
     if (class_array_class == nullptr) {
       return nullptr;
     }
     mirror::ObjectArray<mirror::Class>* empty_array =
         mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, 0);
     return soa.AddLocalReference<jobjectArray>(empty_array);
   } else {
     return soa.AddLocalReference<jobjectArray>(result_array);
   }
 }

 static jobjectArray Constructor_getParameterAnnotationsNative(JNIEnv* env, jobject javaMethod) {
   ScopedFastNativeObjectAccess soa(env);
   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
   if (method->IsProxyMethod()) {
     return nullptr;
   } else {
     return soa.AddLocalReference<jobjectArray>(
         method->GetDexFile()->GetParameterAnnotations(method));
   }
 }

 static jboolean Constructor_isAnnotationPresentNative(JNIEnv* env, jobject javaMethod,
                                                       jclass annotationType) {
   ScopedFastNativeObjectAccess soa(env);
   StackHandleScope<1> hs(soa.Self());
   ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
   if (method->IsProxyMethod()) {
     // Proxies have no annotations.
     return false;
   }
   Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class*>(annotationType)));
   return method->GetDexFile()->IsMethodAnnotationPresent(method, klass);
 }

 /*
  * We can also safely assume the constructor isn't associated
  * with an interface, array, or primitive class. If this is coming from
  * native, it is OK to avoid access checks since JNI does not enforce them.
  */
 static jobject Constructor_newInstance0(JNIEnv* env, jobject javaMethod, jobjectArray javaArgs) {
   ScopedFastNativeObjectAccess soa(env);
   mirror::Constructor* m = soa.Decode<mirror::Constructor*>(javaMethod);
   StackHandleScope<1> hs(soa.Self());
   Handle<mirror::Class> c(hs.NewHandle(m->GetDeclaringClass()));
   if (UNLIKELY(c->IsAbstract())) {
     soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;", "Can't instantiate %s %s",
                                    c->IsInterface() ? "interface" : "abstract class",
                                    PrettyDescriptor(c.Get()).c_str());
     return nullptr;
   }
   // Verify that we can access the class.
   if (!m->IsAccessible() && !c->IsPublic()) {
     // Go 2 frames back, this method is always called from newInstance0, which is called from
     // Constructor.newInstance(Object... args).
     auto* caller = GetCallingClass(soa.Self(), 2);
     // If caller is null, then we called from JNI, just avoid the check since JNI avoids most
     // access checks anyways. TODO: Investigate if this the correct behavior.
     if (caller != nullptr && !caller->CanAccess(c.Get())) {
       if (PrettyDescriptor(c.Get()) == "dalvik.system.DexPathList$Element") {
         // b/20699073.
         LOG(WARNING) << "The dalvik.system.DexPathList$Element constructor is not accessible by "
                         "default. This is a temporary workaround for backwards compatibility "
                         "with class-loader hacks. Please update your application.";
       } else {
         soa.Self()->ThrowNewExceptionF(
             "Ljava/lang/IllegalAccessException;", "%s is not accessible from %s",
             PrettyClass(c.Get()).c_str(), PrettyClass(caller).c_str());
         return nullptr;
       }
     }
   }
   if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(soa.Self(), c, true, true)) {
     DCHECK(soa.Self()->IsExceptionPending());
     return nullptr;
   }
   bool movable = true;
   if (!kMovingClasses && c->IsClassClass()) {
     movable = false;
   }

   // String constructor is replaced by a StringFactory method in InvokeMethod.
   if (c->IsStringClass()) {
     return InvokeMethod(soa, javaMethod, nullptr, javaArgs, 2);
   }

   mirror::Object* receiver =
       movable ? c->AllocObject(soa.Self()) : c->AllocNonMovableObject(soa.Self());
   if (receiver == nullptr) {
     return nullptr;
   }
   jobject javaReceiver = soa.AddLocalReference<jobject>(receiver);
   InvokeMethod(soa, javaMethod, javaReceiver, javaArgs, 2);
   // Constructors are ()V methods, so we shouldn't touch the result of InvokeMethod.
   return javaReceiver;
 }

 static jobject Constructor_newInstanceFromSerialization(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED,
                                                         jclass ctorClass, jclass allocClass) {
     jmethodID ctor = env->GetMethodID(ctorClass, "<init>", "()V");
     DCHECK(ctor != NULL);
     return env->NewObject(allocClass, ctor);
 }

 static JNINativeMethod gMethods[] = {
   NATIVE_METHOD(Constructor, getAnnotationNative,
                 "!(Ljava/lang/Class;)Ljava/lang/annotation/Annotation;"),
   NATIVE_METHOD(Constructor, getDeclaredAnnotations, "!()[Ljava/lang/annotation/Annotation;"),
   NATIVE_METHOD(Constructor, getExceptionTypes, "!()[Ljava/lang/Class;"),
   NATIVE_METHOD(Constructor, getParameterAnnotationsNative,
                 "!()[[Ljava/lang/annotation/Annotation;"),
   NATIVE_METHOD(Constructor, isAnnotationPresentNative, "!(Ljava/lang/Class;)Z"),
   NATIVE_METHOD(Constructor, newInstance0, "!([Ljava/lang/Object;)Ljava/lang/Object;"),
   NATIVE_METHOD(Constructor, newInstanceFromSerialization, "!(Ljava/lang/Class;Ljava/lang/Class;)Ljava/lang/Object;"),
 };

 void register_java_lang_reflect_Constructor(JNIEnv* env) {
   REGISTER_NATIVE_METHODS("java/lang/reflect/Constructor");
 }

 }  // 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_reflect_Constructor.h"

	#include "art_method-inl.h"
	#include "base/enums.h"
	#include "class_linker.h"
	#include "class_linker-inl.h"
	#include "jni_internal.h"
	#include "mirror/class-inl.h"
	#include "mirror/method.h"
	#include "mirror/object-inl.h"
	#include "reflection.h"
	#include "scoped_fast_native_object_access.h"
	#include "well_known_classes.h"

	namespace art {

	static jobject Constructor_getAnnotationNative(JNIEnv* env, jobject javaMethod,
	jclass annotationType) {
	ScopedFastNativeObjectAccess soa(env);
	StackHandleScope<1> hs(soa.Self());
	ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
	if (method->IsProxyMethod()) {
	return nullptr;
	} else {
	Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class*>(annotationType)));
	return soa.AddLocalReference<jobject>(
	method->GetDexFile()->GetAnnotationForMethod(method, klass));
	}
	}

	static jobjectArray Constructor_getDeclaredAnnotations(JNIEnv* env, jobject javaMethod) {
	ScopedFastNativeObjectAccess soa(env);
	ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
	if (method->IsProxyMethod()) {
	mirror::Class* class_class = mirror::Class::GetJavaLangClass();
	mirror::Class* class_array_class =
	Runtime::Current()->GetClassLinker()->FindArrayClass(soa.Self(), &class_class);
	if (class_array_class == nullptr) {
	return nullptr;
	}
	mirror::ObjectArray<mirror::Class>* empty_array =
	mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, 0);
	return soa.AddLocalReference<jobjectArray>(empty_array);
	} else {
	return soa.AddLocalReference<jobjectArray>(
	method->GetDexFile()->GetAnnotationsForMethod(method));
	}
	}

	static jobjectArray Constructor_getExceptionTypes(JNIEnv* env, jobject javaMethod) {
	ScopedFastNativeObjectAccess soa(env);
	ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod)
	->GetInterfaceMethodIfProxy(kRuntimePointerSize);
	mirror::ObjectArray<mirror::Class>* result_array =
	method->GetDexFile()->GetExceptionTypesForMethod(method);
	if (result_array == nullptr) {
	// Return an empty array instead of a null pointer.
	mirror::Class* class_class = mirror::Class::GetJavaLangClass();
	mirror::Class* class_array_class =
	Runtime::Current()->GetClassLinker()->FindArrayClass(soa.Self(), &class_class);
	if (class_array_class == nullptr) {
	return nullptr;
	}
	mirror::ObjectArray<mirror::Class>* empty_array =
	mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, 0);
	return soa.AddLocalReference<jobjectArray>(empty_array);
	} else {
	return soa.AddLocalReference<jobjectArray>(result_array);
	}
	}

	static jobjectArray Constructor_getParameterAnnotationsNative(JNIEnv* env, jobject javaMethod) {
	ScopedFastNativeObjectAccess soa(env);
	ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
	if (method->IsProxyMethod()) {
	return nullptr;
	} else {
	return soa.AddLocalReference<jobjectArray>(
	method->GetDexFile()->GetParameterAnnotations(method));
	}
	}

	static jboolean Constructor_isAnnotationPresentNative(JNIEnv* env, jobject javaMethod,
	jclass annotationType) {
	ScopedFastNativeObjectAccess soa(env);
	StackHandleScope<1> hs(soa.Self());
	ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
	if (method->IsProxyMethod()) {
	// Proxies have no annotations.
	return false;
	}
	Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class*>(annotationType)));
	return method->GetDexFile()->IsMethodAnnotationPresent(method, klass);
	}

	/*
	* We can also safely assume the constructor isn't associated
	* with an interface, array, or primitive class. If this is coming from
	* native, it is OK to avoid access checks since JNI does not enforce them.
	*/
	static jobject Constructor_newInstance0(JNIEnv* env, jobject javaMethod, jobjectArray javaArgs) {
	ScopedFastNativeObjectAccess soa(env);
	mirror::Constructor* m = soa.Decode<mirror::Constructor*>(javaMethod);
	StackHandleScope<1> hs(soa.Self());
	Handle<mirror::Class> c(hs.NewHandle(m->GetDeclaringClass()));
	if (UNLIKELY(c->IsAbstract())) {
	soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;", "Can't instantiate %s %s",
	c->IsInterface() ? "interface" : "abstract class",
	PrettyDescriptor(c.Get()).c_str());
	return nullptr;
	}
	// Verify that we can access the class.
	if (!m->IsAccessible() && !c->IsPublic()) {
	// Go 2 frames back, this method is always called from newInstance0, which is called from
	// Constructor.newInstance(Object... args).
	auto* caller = GetCallingClass(soa.Self(), 2);
	// If caller is null, then we called from JNI, just avoid the check since JNI avoids most
	// access checks anyways. TODO: Investigate if this the correct behavior.
	if (caller != nullptr && !caller->CanAccess(c.Get())) {
	if (PrettyDescriptor(c.Get()) == "dalvik.system.DexPathList$Element") {
	// b/20699073.
	LOG(WARNING) << "The dalvik.system.DexPathList$Element constructor is not accessible by "
	"default. This is a temporary workaround for backwards compatibility "
	"with class-loader hacks. Please update your application.";
	} else {
	soa.Self()->ThrowNewExceptionF(
	"Ljava/lang/IllegalAccessException;", "%s is not accessible from %s",
	PrettyClass(c.Get()).c_str(), PrettyClass(caller).c_str());
	return nullptr;
	}
	}
	}
	if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(soa.Self(), c, true, true)) {
	DCHECK(soa.Self()->IsExceptionPending());
	return nullptr;
	}
	bool movable = true;
	if (!kMovingClasses && c->IsClassClass()) {
	movable = false;
	}

	// String constructor is replaced by a StringFactory method in InvokeMethod.
	if (c->IsStringClass()) {
	return InvokeMethod(soa, javaMethod, nullptr, javaArgs, 2);
	}

	mirror::Object* receiver =
	movable ? c->AllocObject(soa.Self()) : c->AllocNonMovableObject(soa.Self());
	if (receiver == nullptr) {
	return nullptr;
	}
	jobject javaReceiver = soa.AddLocalReference<jobject>(receiver);
	InvokeMethod(soa, javaMethod, javaReceiver, javaArgs, 2);
	// Constructors are ()V methods, so we shouldn't touch the result of InvokeMethod.
	return javaReceiver;
	}

	static jobject Constructor_newInstanceFromSerialization(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED,
	jclass ctorClass, jclass allocClass) {
	jmethodID ctor = env->GetMethodID(ctorClass, "<init>", "()V");
	DCHECK(ctor != NULL);
	return env->NewObject(allocClass, ctor);
	}

	static JNINativeMethod gMethods[] = {
	NATIVE_METHOD(Constructor, getAnnotationNative,
	"!(Ljava/lang/Class;)Ljava/lang/annotation/Annotation;"),
	NATIVE_METHOD(Constructor, getDeclaredAnnotations, "!()[Ljava/lang/annotation/Annotation;"),
	NATIVE_METHOD(Constructor, getExceptionTypes, "!()[Ljava/lang/Class;"),
	NATIVE_METHOD(Constructor, getParameterAnnotationsNative,
	"!()[[Ljava/lang/annotation/Annotation;"),
	NATIVE_METHOD(Constructor, isAnnotationPresentNative, "!(Ljava/lang/Class;)Z"),
	NATIVE_METHOD(Constructor, newInstance0, "!([Ljava/lang/Object;)Ljava/lang/Object;"),
	NATIVE_METHOD(Constructor, newInstanceFromSerialization, "!(Ljava/lang/Class;Ljava/lang/Class;)Ljava/lang/Object;"),
	};

	void register_java_lang_reflect_Constructor(JNIEnv* env) {
	REGISTER_NATIVE_METHODS("java/lang/reflect/Constructor");
	}

	} // namespace art