1 /*
2  * Copyright (C) 2011 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_IFTABLE_H_
18 #define ART_RUNTIME_MIRROR_IFTABLE_H_
19 
20 #include "base/casts.h"
21 #include "object_array.h"
22 
23 namespace art {
24 namespace mirror {
25 
26 class MANAGED IfTable FINAL : public ObjectArray<Object> {
27  public:
GetInterface(int32_t i)28   ALWAYS_INLINE Class* GetInterface(int32_t i) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
29     Class* interface = GetWithoutChecks((i * kMax) + kInterface)->AsClass();
30     DCHECK(interface != nullptr);
31     return interface;
32   }
33 
34   ALWAYS_INLINE void SetInterface(int32_t i, Class* interface)
35       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
36 
GetMethodArray(int32_t i)37   PointerArray* GetMethodArray(int32_t i) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
38     auto* method_array = down_cast<PointerArray*>(Get((i * kMax) + kMethodArray));
39     DCHECK(method_array != nullptr);
40     return method_array;
41   }
42 
GetMethodArrayCount(int32_t i)43   size_t GetMethodArrayCount(int32_t i) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
44     auto* method_array = down_cast<PointerArray*>(Get((i * kMax) + kMethodArray));
45     return method_array == nullptr ? 0u : method_array->GetLength();
46   }
47 
SetMethodArray(int32_t i,PointerArray * arr)48   void SetMethodArray(int32_t i, PointerArray* arr) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
49     DCHECK(arr != nullptr);
50     auto idx = i * kMax + kMethodArray;
51     DCHECK(Get(idx) == nullptr);
52     Set<false>(idx, arr);
53   }
54 
Count()55   size_t Count() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
56     return GetLength() / kMax;
57   }
58 
59   enum {
60     // Points to the interface class.
61     kInterface   = 0,
62     // Method pointers into the vtable, allow fast map from interface method index to concrete
63     // instance method.
64     kMethodArray = 1,
65     kMax         = 2,
66   };
67 
68  private:
69   DISALLOW_IMPLICIT_CONSTRUCTORS(IfTable);
70 };
71 
72 }  // namespace mirror
73 }  // namespace art
74 
75 #endif  // ART_RUNTIME_MIRROR_IFTABLE_H_
76