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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  */
Constructor_newInstance(JNIEnv * env,jobject javaMethod,jobjectArray javaArgs)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 
register_java_lang_reflect_Constructor(JNIEnv * env)74 void register_java_lang_reflect_Constructor(JNIEnv* env) {
75   REGISTER_NATIVE_METHODS("java/lang/reflect/Constructor");
76 }
77 
78 }  // namespace art
79