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      1 /*
      2  * Copyright (C) 2015 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_FIELD_H_
     18 #define ART_RUNTIME_MIRROR_FIELD_H_
     19 
     20 #include "accessible_object.h"
     21 #include "base/enums.h"
     22 #include "dex/modifiers.h"
     23 #include "dex/primitive.h"
     24 #include "obj_ptr.h"
     25 #include "object.h"
     26 #include "read_barrier_option.h"
     27 
     28 namespace art {
     29 
     30 class ArtField;
     31 struct FieldOffsets;
     32 
     33 namespace mirror {
     34 
     35 class Class;
     36 class String;
     37 
     38 // C++ mirror of java.lang.reflect.Field.
     39 class MANAGED Field : public AccessibleObject {
     40  public:
     41   ALWAYS_INLINE uint32_t GetDexFieldIndex() REQUIRES_SHARED(Locks::mutator_lock_) {
     42     return GetField32(OFFSET_OF_OBJECT_MEMBER(Field, dex_field_index_));
     43   }
     44 
     45   ObjPtr<mirror::Class> GetDeclaringClass() REQUIRES_SHARED(Locks::mutator_lock_);
     46 
     47   uint32_t GetAccessFlags() REQUIRES_SHARED(Locks::mutator_lock_) {
     48     return GetField32(OFFSET_OF_OBJECT_MEMBER(Field, access_flags_));
     49   }
     50 
     51   bool IsStatic() REQUIRES_SHARED(Locks::mutator_lock_) {
     52     return (GetAccessFlags() & kAccStatic) != 0;
     53   }
     54 
     55   bool IsFinal() REQUIRES_SHARED(Locks::mutator_lock_) {
     56     return (GetAccessFlags() & kAccFinal) != 0;
     57   }
     58 
     59   bool IsVolatile() REQUIRES_SHARED(Locks::mutator_lock_) {
     60     return (GetAccessFlags() & kAccVolatile) != 0;
     61   }
     62 
     63   ALWAYS_INLINE Primitive::Type GetTypeAsPrimitiveType() REQUIRES_SHARED(Locks::mutator_lock_);
     64 
     65   ObjPtr<mirror::Class> GetType() REQUIRES_SHARED(Locks::mutator_lock_);
     66 
     67   int32_t GetOffset() REQUIRES_SHARED(Locks::mutator_lock_) {
     68     return GetField32(OFFSET_OF_OBJECT_MEMBER(Field, offset_));
     69   }
     70 
     71   // Slow, try to use only for PrettyField and such.
     72   ArtField* GetArtField() REQUIRES_SHARED(Locks::mutator_lock_);
     73 
     74   template <PointerSize kPointerSize, bool kTransactionActive = false>
     75   static ObjPtr<mirror::Field> CreateFromArtField(Thread* self,
     76                                                   ArtField* field,
     77                                                   bool force_resolve)
     78       REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
     79 
     80  private:
     81   // Padding required for matching alignment with the Java peer.
     82   uint8_t padding_[2];
     83 
     84   HeapReference<mirror::Class> declaring_class_;
     85   HeapReference<mirror::Class> type_;
     86   int32_t access_flags_;
     87   int32_t dex_field_index_;
     88   int32_t offset_;
     89 
     90   template<bool kTransactionActive>
     91   void SetDeclaringClass(ObjPtr<mirror::Class> c) REQUIRES_SHARED(Locks::mutator_lock_);
     92 
     93   template<bool kTransactionActive>
     94   void SetType(ObjPtr<mirror::Class> type) REQUIRES_SHARED(Locks::mutator_lock_);
     95 
     96   template<bool kTransactionActive>
     97   void SetAccessFlags(uint32_t flags) REQUIRES_SHARED(Locks::mutator_lock_) {
     98     SetField32<kTransactionActive>(OFFSET_OF_OBJECT_MEMBER(Field, access_flags_), flags);
     99   }
    100 
    101   template<bool kTransactionActive>
    102   void SetDexFieldIndex(uint32_t idx) REQUIRES_SHARED(Locks::mutator_lock_) {
    103     SetField32<kTransactionActive>(OFFSET_OF_OBJECT_MEMBER(Field, dex_field_index_), idx);
    104   }
    105 
    106   template<bool kTransactionActive>
    107   void SetOffset(uint32_t offset) REQUIRES_SHARED(Locks::mutator_lock_) {
    108     SetField32<kTransactionActive>(OFFSET_OF_OBJECT_MEMBER(Field, offset_), offset);
    109   }
    110 
    111   friend struct art::FieldOffsets;  // for verifying offset information
    112   DISALLOW_IMPLICIT_CONSTRUCTORS(Field);
    113 };
    114 
    115 }  // namespace mirror
    116 }  // namespace art
    117 
    118 #endif  // ART_RUNTIME_MIRROR_FIELD_H_
    119