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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_reflect_Constructor.h"
#include "nativehelper/jni_macros.h"
#include "art_method-inl.h"
#include "base/enums.h"
#include "class_linker.h"
#include "class_root.h"
#include "dex/dex_file_annotations.h"
#include "jni/jni_internal.h"
#include "mirror/class-alloc-inl.h"
#include "mirror/class-inl.h"
#include "mirror/executable-inl.h"
#include "mirror/method.h"
#include "mirror/object_array-alloc-inl.h"
#include "mirror/object-inl.h"
#include "native_util.h"
#include "reflection.h"
#include "scoped_fast_native_object_access-inl.h"
#include "well_known_classes.h"
namespace art {
static jobjectArray Constructor_getExceptionTypes(JNIEnv* env, jobject javaMethod) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod)
->GetInterfaceMethodIfProxy(kRuntimePointerSize);
ObjPtr<mirror::ObjectArray<mirror::Class>> result_array =
annotations::GetExceptionTypesForMethod(method);
if (result_array == nullptr) {
// Return an empty array instead of a null pointer.
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);
} else {
return soa.AddLocalReference<jobjectArray>(result_array);
}
}
/*
* 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);
ObjPtr<mirror::Constructor> m = soa.Decode<mirror::Constructor>(javaMethod);
ArtMethod* constructor_art_method = m->GetArtMethod();
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",
c->PrettyDescriptor().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).
ObjPtr<mirror::Class> 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 (c->PrettyDescriptor() == "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",
c->PrettyClass().c_str(),
caller->PrettyClass().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 (UNLIKELY(c->IsStringClass())) {
return InvokeMethod(soa, javaMethod, nullptr, javaArgs, 2);
}
ObjPtr<mirror::Object> receiver =
movable ? c->AllocObject(soa.Self()) : c->AllocNonMovableObject(soa.Self());
if (UNLIKELY(receiver == nullptr)) {
DCHECK(soa.Self()->IsExceptionPending());
return nullptr;
}
jobject javaReceiver = soa.AddLocalReference<jobject>(receiver);
InvokeConstructor(soa, constructor_art_method, receiver, javaArgs);
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 != nullptr);
return env->NewObject(allocClass, ctor);
}
static JNINativeMethod gMethods[] = {
FAST_NATIVE_METHOD(Constructor, getExceptionTypes, "()[Ljava/lang/Class;"),
FAST_NATIVE_METHOD(Constructor, newInstance0, "([Ljava/lang/Object;)Ljava/lang/Object;"),
FAST_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
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