1 /*
2  * Copyright (C) 2018 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_COMPILER_OPTIMIZING_INTRINSIC_OBJECTS_H_
18 #define ART_COMPILER_OPTIMIZING_INTRINSIC_OBJECTS_H_
19 
20 #include "base/bit_field.h"
21 #include "base/bit_utils.h"
22 #include "base/mutex.h"
23 
24 namespace art {
25 
26 class ClassLinker;
27 template <class MirrorType> class ObjPtr;
28 class MemberOffset;
29 class Thread;
30 
31 namespace mirror {
32 class Object;
33 template <class T> class ObjectArray;
34 }  // namespace mirror
35 
36 class IntrinsicObjects {
37  public:
38   enum class PatchType {
39     kIntegerValueOfObject,
40     kIntegerValueOfArray,
41 
42     kLast = kIntegerValueOfArray
43   };
44 
45   static uint32_t EncodePatch(PatchType patch_type, uint32_t index = 0u) {
46     DCHECK(patch_type == PatchType::kIntegerValueOfObject || index == 0u);
47     return PatchTypeField::Encode(static_cast<uint32_t>(patch_type)) | IndexField::Encode(index);
48   }
49 
DecodePatchType(uint32_t intrinsic_data)50   static PatchType DecodePatchType(uint32_t intrinsic_data) {
51     return static_cast<PatchType>(PatchTypeField::Decode(intrinsic_data));
52   }
53 
DecodePatchIndex(uint32_t intrinsic_data)54   static uint32_t DecodePatchIndex(uint32_t intrinsic_data) {
55     return IndexField::Decode(intrinsic_data);
56   }
57 
58   // Functions for retrieving data for Integer.valueOf().
59   static ObjPtr<mirror::ObjectArray<mirror::Object>> LookupIntegerCache(
60       Thread* self, ClassLinker* class_linker) REQUIRES_SHARED(Locks::mutator_lock_);
61   static ObjPtr<mirror::ObjectArray<mirror::Object>> GetIntegerValueOfCache(
62       ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects)
63       REQUIRES_SHARED(Locks::mutator_lock_);
64   static ObjPtr<mirror::Object> GetIntegerValueOfObject(
65       ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects,
66       uint32_t index) REQUIRES_SHARED(Locks::mutator_lock_);
67   static MemberOffset GetIntegerValueOfArrayDataOffset(
68       ObjPtr<mirror::ObjectArray<mirror::Object>> boot_image_live_objects)
69       REQUIRES_SHARED(Locks::mutator_lock_);
70 
71  private:
72   static constexpr size_t kPatchTypeBits =
73       MinimumBitsToStore(static_cast<uint32_t>(PatchType::kLast));
74   static constexpr size_t kIndexBits = BitSizeOf<uint32_t>() - kPatchTypeBits;
75   using PatchTypeField = BitField<uint32_t, 0u, kPatchTypeBits>;
76   using IndexField = BitField<uint32_t, kPatchTypeBits, kIndexBits>;
77 };
78 
79 }  // namespace art
80 
81 #endif  // ART_COMPILER_OPTIMIZING_INTRINSIC_OBJECTS_H_
82