142 lines
5.7 KiB
C++
142 lines
5.7 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "java_lang_reflect_Constructor.h"
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#include "nativehelper/jni_macros.h"
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#include "art_method-inl.h"
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#include "base/enums.h"
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#include "class_linker.h"
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#include "class_root-inl.h"
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#include "dex/dex_file_annotations.h"
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#include "jni/jni_internal.h"
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#include "mirror/class-alloc-inl.h"
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#include "mirror/class-inl.h"
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#include "mirror/executable-inl.h"
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#include "mirror/method.h"
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#include "mirror/object_array-alloc-inl.h"
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#include "mirror/object-inl.h"
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#include "native_util.h"
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#include "reflection.h"
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#include "scoped_fast_native_object_access-inl.h"
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#include "well_known_classes.h"
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namespace art {
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static jobjectArray Constructor_getExceptionTypes(JNIEnv* env, jobject javaMethod) {
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ScopedFastNativeObjectAccess soa(env);
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ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod)
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->GetInterfaceMethodIfProxy(kRuntimePointerSize);
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ObjPtr<mirror::ObjectArray<mirror::Class>> result_array =
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annotations::GetExceptionTypesForMethod(method);
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if (result_array == nullptr) {
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// Return an empty array instead of a null pointer.
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ObjPtr<mirror::Class> class_array_class = GetClassRoot<mirror::ObjectArray<mirror::Class>>();
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DCHECK(class_array_class != nullptr);
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ObjPtr<mirror::ObjectArray<mirror::Class>> empty_array =
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mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, 0);
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return soa.AddLocalReference<jobjectArray>(empty_array);
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} else {
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return soa.AddLocalReference<jobjectArray>(result_array);
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}
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}
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/*
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* We can also safely assume the constructor isn't associated
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* with an interface, array, or primitive class. If this is coming from
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* native, it is OK to avoid access checks since JNI does not enforce them.
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*/
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static jobject Constructor_newInstance0(JNIEnv* env, jobject javaMethod, jobjectArray javaArgs) {
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ScopedFastNativeObjectAccess soa(env);
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ObjPtr<mirror::Constructor> m = soa.Decode<mirror::Constructor>(javaMethod);
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ArtMethod* constructor_art_method = m->GetArtMethod();
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StackHandleScope<1> hs(soa.Self());
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Handle<mirror::Class> c(hs.NewHandle(m->GetDeclaringClass()));
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if (UNLIKELY(c->IsAbstract())) {
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soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;", "Can't instantiate %s %s",
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c->IsInterface() ? "interface" : "abstract class",
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c->PrettyDescriptor().c_str());
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return nullptr;
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}
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// Verify that we can access the class.
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if (!m->IsAccessible() && !c->IsPublic()) {
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// Go 2 frames back, this method is always called from newInstance0, which is called from
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// Constructor.newInstance(Object... args).
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ObjPtr<mirror::Class> caller = GetCallingClass(soa.Self(), 2);
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// If caller is null, then we called from JNI, just avoid the check since JNI avoids most
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// access checks anyways. TODO: Investigate if this the correct behavior.
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if (caller != nullptr && !caller->CanAccess(c.Get())) {
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if (c->PrettyDescriptor() == "dalvik.system.DexPathList$Element") {
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// b/20699073.
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LOG(WARNING) << "The dalvik.system.DexPathList$Element constructor is not accessible by "
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"default. This is a temporary workaround for backwards compatibility "
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"with class-loader hacks. Please update your application.";
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} else {
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soa.Self()->ThrowNewExceptionF(
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"Ljava/lang/IllegalAccessException;", "%s is not accessible from %s",
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c->PrettyClass().c_str(),
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caller->PrettyClass().c_str());
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return nullptr;
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}
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}
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}
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if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(soa.Self(), c, true, true)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return nullptr;
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}
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bool movable = true;
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if (!kMovingClasses && c->IsClassClass()) {
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movable = false;
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}
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// String constructor is replaced by a StringFactory method in InvokeMethod.
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if (UNLIKELY(c->IsStringClass())) {
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return InvokeMethod<kRuntimePointerSize>(soa, javaMethod, nullptr, javaArgs, 2);
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}
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ObjPtr<mirror::Object> receiver =
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movable ? c->AllocObject(soa.Self()) : c->AllocNonMovableObject(soa.Self());
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if (UNLIKELY(receiver == nullptr)) {
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DCHECK(soa.Self()->IsExceptionPending());
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return nullptr;
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}
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jobject javaReceiver = soa.AddLocalReference<jobject>(receiver);
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InvokeConstructor(soa, constructor_art_method, receiver, javaArgs);
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return javaReceiver;
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}
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static jobject Constructor_newInstanceFromSerialization(JNIEnv* env, jclass unused ATTRIBUTE_UNUSED,
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jclass ctorClass, jclass allocClass) {
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jmethodID ctor = env->GetMethodID(ctorClass, "<init>", "()V");
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DCHECK(ctor != nullptr);
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return env->NewObject(allocClass, ctor);
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}
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static JNINativeMethod gMethods[] = {
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FAST_NATIVE_METHOD(Constructor, getExceptionTypes, "()[Ljava/lang/Class;"),
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FAST_NATIVE_METHOD(Constructor, newInstance0, "([Ljava/lang/Object;)Ljava/lang/Object;"),
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FAST_NATIVE_METHOD(Constructor, newInstanceFromSerialization, "(Ljava/lang/Class;Ljava/lang/Class;)Ljava/lang/Object;"),
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};
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void register_java_lang_reflect_Constructor(JNIEnv* env) {
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REGISTER_NATIVE_METHODS("java/lang/reflect/Constructor");
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}
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} // namespace art
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