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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 "reflection.h"
     24 #include "scoped_fast_native_object_access.h"
     25 #include "well_known_classes.h"
     26 
     27 namespace art {
     28 
     29 /*
     30  * We get here through Constructor.newInstance().  The Constructor object
     31  * would not be available if the constructor weren't public (per the
     32  * definition of Class.getConstructor), so we can skip the method access
     33  * check.  We can also safely assume the constructor isn't associated
     34  * with an interface, array, or primitive class.
     35  */
     36 static jobject Constructor_newInstance(JNIEnv* env, jobject javaMethod, jobjectArray javaArgs,
     37                                        jboolean accessible) {
     38   ScopedFastNativeObjectAccess soa(env);
     39   mirror::ArtMethod* m = mirror::ArtMethod::FromReflectedMethod(soa, javaMethod);
     40   StackHandleScope<1> hs(soa.Self());
     41   Handle<mirror::Class> c(hs.NewHandle(m->GetDeclaringClass()));
     42   if (UNLIKELY(c->IsAbstract())) {
     43     ThrowLocation throw_location = soa.Self()->GetCurrentLocationForThrow();
     44     soa.Self()->ThrowNewExceptionF(throw_location, "Ljava/lang/InstantiationException;",
     45                                    "Can't instantiate %s %s",
     46                                    c->IsInterface() ? "interface" : "abstract class",
     47                                    PrettyDescriptor(c.Get()).c_str());
     48     return nullptr;
     49   }
     50 
     51   if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(c, true, true)) {
     52     DCHECK(soa.Self()->IsExceptionPending());
     53     return nullptr;
     54   }
     55 
     56   bool movable = true;
     57   if (!kMovingMethods && c->IsArtMethodClass()) {
     58     movable = false;
     59   } else if (!kMovingFields && c->IsArtFieldClass()) {
     60     movable = false;
     61   } else if (!kMovingClasses && c->IsClassClass()) {
     62     movable = false;
     63   }
     64   mirror::Object* receiver =
     65       movable ? c->AllocObject(soa.Self()) : c->AllocNonMovableObject(soa.Self());
     66   if (receiver == nullptr) {
     67     return nullptr;
     68   }
     69 
     70   jobject javaReceiver = soa.AddLocalReference<jobject>(receiver);
     71   InvokeMethod(soa, javaMethod, javaReceiver, javaArgs, (accessible == JNI_TRUE));
     72 
     73   // Constructors are ()V methods, so we shouldn't touch the result of InvokeMethod.
     74   return javaReceiver;
     75 }
     76 
     77 static JNINativeMethod gMethods[] = {
     78   NATIVE_METHOD(Constructor, newInstance, "!([Ljava/lang/Object;Z)Ljava/lang/Object;"),
     79 };
     80 
     81 void register_java_lang_reflect_Constructor(JNIEnv* env) {
     82   REGISTER_NATIVE_METHODS("java/lang/reflect/Constructor");
     83 }
     84 
     85 }  // namespace art
     86