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
23namespace art {
24namespace mirror {
25
26class MANAGED IfTable FINAL : public ObjectArray<Object> {
27 public:
28  template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
29           ReadBarrierOption kReadBarrierOption = kWithReadBarrier>
30  ALWAYS_INLINE Class* GetInterface(int32_t i) REQUIRES_SHARED(Locks::mutator_lock_) {
31    Class* interface =
32        GetWithoutChecks<kVerifyFlags, kReadBarrierOption>((i * kMax) + kInterface)->AsClass();
33    DCHECK(interface != nullptr);
34    return interface;
35  }
36
37  ALWAYS_INLINE void SetInterface(int32_t i, ObjPtr<Class> interface)
38      REQUIRES_SHARED(Locks::mutator_lock_);
39
40  template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
41           ReadBarrierOption kReadBarrierOption = kWithReadBarrier>
42  PointerArray* GetMethodArray(int32_t i) REQUIRES_SHARED(Locks::mutator_lock_) {
43    auto* method_array = down_cast<PointerArray*>(Get<kVerifyFlags, kReadBarrierOption>(
44        (i * kMax) + kMethodArray));
45    DCHECK(method_array != nullptr);
46    return method_array;
47  }
48
49  template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,
50           ReadBarrierOption kReadBarrierOption = kWithReadBarrier>
51  size_t GetMethodArrayCount(int32_t i) REQUIRES_SHARED(Locks::mutator_lock_) {
52    auto* method_array = down_cast<PointerArray*>(
53        Get<kVerifyFlags, kReadBarrierOption>((i * kMax) + kMethodArray));
54    return method_array == nullptr ? 0u : method_array->GetLength();
55  }
56
57  void SetMethodArray(int32_t i, ObjPtr<PointerArray> arr) REQUIRES_SHARED(Locks::mutator_lock_);
58
59  size_t Count() REQUIRES_SHARED(Locks::mutator_lock_) {
60    return GetLength() / kMax;
61  }
62
63  enum {
64    // Points to the interface class.
65    kInterface   = 0,
66    // Method pointers into the vtable, allow fast map from interface method index to concrete
67    // instance method.
68    kMethodArray = 1,
69    kMax         = 2,
70  };
71
72 private:
73  DISALLOW_IMPLICIT_CONSTRUCTORS(IfTable);
74};
75
76}  // namespace mirror
77}  // namespace art
78
79#endif  // ART_RUNTIME_MIRROR_IFTABLE_H_
80