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 #ifndef ART_RUNTIME_MIRROR_CALL_SITE_H_
18 #define ART_RUNTIME_MIRROR_CALL_SITE_H_
19 
20 #include "mirror/method_handle_impl.h"
21 #include "utils.h"
22 
23 namespace art {
24 
25 struct CallSiteOffsets;
26 
27 namespace mirror {
28 
29 // C++ mirror of java.lang.invoke.CallSite
30 class MANAGED CallSite : public Object {
31  public:
32   static mirror::CallSite* Create(Thread* const self,
33                                   Handle<MethodHandle> method_handle)
34       REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
35 
StaticClass()36   static mirror::Class* StaticClass() REQUIRES_SHARED(Locks::mutator_lock_) {
37     return static_class_.Read();
38   }
39 
GetTarget()40   MethodHandle* GetTarget() REQUIRES_SHARED(Locks::mutator_lock_) {
41     return GetFieldObject<MethodHandle>(TargetOffset());
42   }
43 
44   static void SetClass(Class* klass) REQUIRES_SHARED(Locks::mutator_lock_);
45   static void ResetClass() REQUIRES_SHARED(Locks::mutator_lock_);
46   static void VisitRoots(RootVisitor* visitor) REQUIRES_SHARED(Locks::mutator_lock_);
47 
48  private:
TargetOffset()49   static inline MemberOffset TargetOffset() {
50     return MemberOffset(OFFSETOF_MEMBER(CallSite, target_));
51   }
52 
53   HeapReference<mirror::MethodHandle> target_;
54 
55   static GcRoot<mirror::Class> static_class_;  // java.lang.invoke.CallSite.class
56 
57   friend struct art::CallSiteOffsets;  // for verifying offset information
58   DISALLOW_IMPLICIT_CONSTRUCTORS(CallSite);
59 };
60 
61 }  // namespace mirror
62 }  // namespace art
63 
64 #endif  // ART_RUNTIME_MIRROR_CALL_SITE_H_
65