1 /*
2 * Copyright (C) 2017 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 "method_handles_lookup.h"
18
19 #include "class-alloc-inl.h"
20 #include "class_root-inl.h"
21 #include "dex/modifiers.h"
22 #include "handle_scope.h"
23 #include "jni/jni_internal.h"
24 #include "mirror/method_handle_impl.h"
25 #include "obj_ptr-inl.h"
26 #include "object-inl.h"
27 #include "well_known_classes.h"
28
29 namespace art {
30 namespace mirror {
31
Create(Thread * const self,Handle<Class> lookup_class)32 ObjPtr<MethodHandlesLookup> MethodHandlesLookup::Create(Thread* const self,
33 Handle<Class> lookup_class)
34 REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_) {
35 static constexpr uint32_t kAllModes = kAccPublic | kAccPrivate | kAccProtected | kAccStatic;
36
37 ObjPtr<MethodHandlesLookup> mhl = ObjPtr<MethodHandlesLookup>::DownCast(
38 GetClassRoot<MethodHandlesLookup>()->AllocObject(self));
39 mhl->SetFieldObject<false>(LookupClassOffset(), lookup_class.Get());
40 mhl->SetField32<false>(AllowedModesOffset(), kAllModes);
41 return mhl;
42 }
43
GetDefault(Thread * const self)44 ObjPtr<MethodHandlesLookup> MethodHandlesLookup::GetDefault(Thread* const self) {
45 ArtMethod* lookup = jni::DecodeArtMethod(WellKnownClasses::java_lang_invoke_MethodHandles_lookup);
46 JValue result;
47 lookup->Invoke(self, nullptr, 0, &result, "L");
48 return ObjPtr<MethodHandlesLookup>::DownCast(result.GetL());
49 }
50
FindConstructor(Thread * const self,Handle<Class> klass,Handle<MethodType> method_type)51 ObjPtr<MethodHandle> MethodHandlesLookup::FindConstructor(Thread* const self,
52 Handle<Class> klass,
53 Handle<MethodType> method_type) {
54 ArtMethod* findConstructor =
55 jni::DecodeArtMethod(WellKnownClasses::java_lang_invoke_MethodHandles_Lookup_findConstructor);
56 uint32_t args[] = {
57 static_cast<uint32_t>(reinterpret_cast<uintptr_t>(this)),
58 static_cast<uint32_t>(reinterpret_cast<uintptr_t>(klass.Get())),
59 static_cast<uint32_t>(reinterpret_cast<uintptr_t>(method_type.Get()))
60 };
61 JValue result;
62 findConstructor->Invoke(self, args, sizeof(args), &result, "LLL");
63 return ObjPtr<MethodHandle>::DownCast(result.GetL());
64 }
65
66 } // namespace mirror
67 } // namespace art
68