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) REQUIRES_SHARED(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, ObjPtr<Class> interface)
35       REQUIRES_SHARED(Locks::mutator_lock_);
36 
37   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
38            ReadBarrierOption kReadBarrierOption = kWithReadBarrier>
GetMethodArray(int32_t i)39   PointerArray* GetMethodArray(int32_t i) REQUIRES_SHARED(Locks::mutator_lock_) {
40     auto* method_array = down_cast<PointerArray*>(Get<kVerifyFlags, kReadBarrierOption>(
41         (i * kMax) + kMethodArray));
42     DCHECK(method_array != nullptr);
43     return method_array;
44   }
45 
46   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
47            ReadBarrierOption kReadBarrierOption = kWithReadBarrier>
GetMethodArrayCount(int32_t i)48   size_t GetMethodArrayCount(int32_t i) REQUIRES_SHARED(Locks::mutator_lock_) {
49     auto* method_array = down_cast<PointerArray*>(
50         Get<kVerifyFlags, kReadBarrierOption>((i * kMax) + kMethodArray));
51     return method_array == nullptr ? 0u : method_array->GetLength();
52   }
53 
54   void SetMethodArray(int32_t i, ObjPtr<PointerArray> arr) REQUIRES_SHARED(Locks::mutator_lock_);
55 
Count()56   size_t Count() REQUIRES_SHARED(Locks::mutator_lock_) {
57     return GetLength() / kMax;
58   }
59 
60   enum {
61     // Points to the interface class.
62     kInterface   = 0,
63     // Method pointers into the vtable, allow fast map from interface method index to concrete
64     // instance method.
65     kMethodArray = 1,
66     kMax         = 2,
67   };
68 
69  private:
70   DISALLOW_IMPLICIT_CONSTRUCTORS(IfTable);
71 };
72 
73 }  // namespace mirror
74 }  // namespace art
75 
76 #endif  // ART_RUNTIME_MIRROR_IFTABLE_H_
77