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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "class_linker.h"
     18 #include "jni_internal.h"
     19 #include "mirror/art_method.h"
     20 #include "mirror/art_method-inl.h"
     21 #include "mirror/class-inl.h"
     22 #include "mirror/object-inl.h"
     23 #include "object_utils.h"
     24 #include "reflection.h"
     25 #include "scoped_thread_state_change.h"
     26 #include "well_known_classes.h"
     27 
     28 namespace art {
     29 
     30 /*
     31  * We get here through Constructor.newInstance().  The Constructor object
     32  * would not be available if the constructor weren't public (per the
     33  * definition of Class.getConstructor), so we can skip the method access
     34  * check.  We can also safely assume the constructor isn't associated
     35  * with an interface, array, or primitive class.
     36  */
     37 static jobject Constructor_newInstance(JNIEnv* env, jobject javaMethod, jobjectArray javaArgs) {
     38   ScopedObjectAccess soa(env);
     39   jobject art_method = soa.Env()->GetObjectField(
     40       javaMethod, WellKnownClasses::java_lang_reflect_AbstractMethod_artMethod);
     41 
     42   mirror::ArtMethod* m = soa.Decode<mirror::Object*>(art_method)->AsArtMethod();
     43   mirror::Class* c = m->GetDeclaringClass();
     44   if (UNLIKELY(c->IsAbstract())) {
     45     ThrowLocation throw_location = soa.Self()->GetCurrentLocationForThrow();
     46     soa.Self()->ThrowNewExceptionF(throw_location, "Ljava/lang/InstantiationException;",
     47                                    "Can't instantiate %s %s",
     48                                    c->IsInterface() ? "interface" : "abstract class",
     49                                    PrettyDescriptor(c).c_str());
     50     return NULL;
     51   }
     52 
     53   if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(c, true, true)) {
     54     DCHECK(soa.Self()->IsExceptionPending());
     55     return NULL;
     56   }
     57 
     58   mirror::Object* receiver = c->AllocObject(soa.Self());
     59   if (receiver == NULL) {
     60     return NULL;
     61   }
     62 
     63   jobject javaReceiver = soa.AddLocalReference<jobject>(receiver);
     64   InvokeMethod(soa, javaMethod, javaReceiver, javaArgs);
     65 
     66   // Constructors are ()V methods, so we shouldn't touch the result of InvokeMethod.
     67   return javaReceiver;
     68 }
     69 
     70 static JNINativeMethod gMethods[] = {
     71   NATIVE_METHOD(Constructor, newInstance, "([Ljava/lang/Object;)Ljava/lang/Object;"),
     72 };
     73 
     74 void register_java_lang_reflect_Constructor(JNIEnv* env) {
     75   REGISTER_NATIVE_METHODS("java/lang/reflect/Constructor");
     76 }
     77 
     78 }  // namespace art
     79