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 "java_lang_invoke_MethodHandleImpl.h"
18 
19 #include "nativehelper/jni_macros.h"
20 
21 #include "art_method.h"
22 #include "handle_scope-inl.h"
23 #include "jni/jni_internal.h"
24 #include "mirror/field.h"
25 #include "mirror/method.h"
26 #include "mirror/method_handle_impl.h"
27 #include "native_util.h"
28 #include "runtime.h"
29 #include "scoped_thread_state_change-inl.h"
30 
31 namespace art {
32 
MethodHandleImpl_getMemberInternal(JNIEnv * env,jobject thiz)33 static jobject MethodHandleImpl_getMemberInternal(JNIEnv* env, jobject thiz) {
34   ScopedObjectAccess soa(env);
35   StackHandleScope<2> hs(soa.Self());
36   Handle<mirror::MethodHandleImpl> handle = hs.NewHandle(
37       soa.Decode<mirror::MethodHandleImpl>(thiz));
38 
39   // Check the handle kind, we need to materialize a Field for field accessors,
40   // a Method for method invokers and a Constructor for constructors.
41   const mirror::MethodHandle::Kind handle_kind = handle->GetHandleKind();
42 
43   MutableHandle<mirror::Object> h_object(hs.NewHandle<mirror::Object>(nullptr));
44   if (handle_kind >= mirror::MethodHandle::kFirstAccessorKind) {
45     ArtField* const field = handle->GetTargetField();
46     h_object.Assign(
47         mirror::Field::CreateFromArtField(soa.Self(), field, /* force_resolve= */ false));
48   } else {
49     ArtMethod* const method = handle->GetTargetMethod();
50     if (method->IsConstructor()) {
51       h_object.Assign(
52           mirror::Constructor::CreateFromArtMethod<kRuntimePointerSize>(soa.Self(), method));
53     } else {
54       h_object.Assign(mirror::Method::CreateFromArtMethod<kRuntimePointerSize>(soa.Self(), method));
55     }
56   }
57 
58   if (UNLIKELY(h_object == nullptr)) {
59     soa.Self()->AssertPendingOOMException();
60     return nullptr;
61   }
62 
63   return soa.AddLocalReference<jobject>(h_object.Get());
64 }
65 
66 static JNINativeMethod gMethods[] = {
67   NATIVE_METHOD(MethodHandleImpl, getMemberInternal, "()Ljava/lang/reflect/Member;"),
68 };
69 
register_java_lang_invoke_MethodHandleImpl(JNIEnv * env)70 void register_java_lang_invoke_MethodHandleImpl(JNIEnv* env) {
71   REGISTER_NATIVE_METHODS("java/lang/invoke/MethodHandleImpl");
72 }
73 
74 }  // namespace art
75