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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 "gc_root.h"
     22 #include "object.h"
     23 #include "object_callbacks.h"
     24 #include "read_barrier_option.h"
     25 
     26 namespace art {
     27 
     28 class ArtField;
     29 struct FieldOffsets;
     30 
     31 namespace mirror {
     32 
     33 class Class;
     34 class String;
     35 
     36 // C++ mirror of java.lang.reflect.Field.
     37 class MANAGED Field : public AccessibleObject {
     38  public:
     39   static mirror::Class* StaticClass() SHARED_REQUIRES(Locks::mutator_lock_) {
     40     return static_class_.Read();
     41   }
     42 
     43   static mirror::Class* ArrayClass() SHARED_REQUIRES(Locks::mutator_lock_) {
     44     return array_class_.Read();
     45   }
     46 
     47   ALWAYS_INLINE uint32_t GetDexFieldIndex() SHARED_REQUIRES(Locks::mutator_lock_) {
     48     return GetField32(OFFSET_OF_OBJECT_MEMBER(Field, dex_field_index_));
     49   }
     50 
     51   mirror::Class* GetDeclaringClass() SHARED_REQUIRES(Locks::mutator_lock_) {
     52     return GetFieldObject<Class>(OFFSET_OF_OBJECT_MEMBER(Field, declaring_class_));
     53   }
     54 
     55   uint32_t GetAccessFlags() SHARED_REQUIRES(Locks::mutator_lock_) {
     56     return GetField32(OFFSET_OF_OBJECT_MEMBER(Field, access_flags_));
     57   }
     58 
     59   bool IsStatic() SHARED_REQUIRES(Locks::mutator_lock_) {
     60     return (GetAccessFlags() & kAccStatic) != 0;
     61   }
     62 
     63   bool IsFinal() SHARED_REQUIRES(Locks::mutator_lock_) {
     64     return (GetAccessFlags() & kAccFinal) != 0;
     65   }
     66 
     67   bool IsVolatile() SHARED_REQUIRES(Locks::mutator_lock_) {
     68     return (GetAccessFlags() & kAccVolatile) != 0;
     69   }
     70 
     71   ALWAYS_INLINE Primitive::Type GetTypeAsPrimitiveType()
     72       SHARED_REQUIRES(Locks::mutator_lock_) {
     73     return GetType()->GetPrimitiveType();
     74   }
     75 
     76   mirror::Class* GetType() SHARED_REQUIRES(Locks::mutator_lock_) {
     77     return GetFieldObject<mirror::Class>(OFFSET_OF_OBJECT_MEMBER(Field, type_));
     78   }
     79 
     80   int32_t GetOffset() SHARED_REQUIRES(Locks::mutator_lock_) {
     81     return GetField32(OFFSET_OF_OBJECT_MEMBER(Field, offset_));
     82   }
     83 
     84   static void SetClass(Class* klass) SHARED_REQUIRES(Locks::mutator_lock_);
     85   static void ResetClass() SHARED_REQUIRES(Locks::mutator_lock_);
     86 
     87   static void SetArrayClass(Class* klass) SHARED_REQUIRES(Locks::mutator_lock_);
     88   static void ResetArrayClass() SHARED_REQUIRES(Locks::mutator_lock_);
     89 
     90   static void VisitRoots(RootVisitor* visitor) SHARED_REQUIRES(Locks::mutator_lock_);
     91 
     92   // Slow, try to use only for PrettyField and such.
     93   ArtField* GetArtField() SHARED_REQUIRES(Locks::mutator_lock_);
     94 
     95   template <bool kTransactionActive = false>
     96   static mirror::Field* CreateFromArtField(Thread* self, ArtField* field,
     97                                            bool force_resolve)
     98       SHARED_REQUIRES(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
     99 
    100  private:
    101   HeapReference<mirror::Class> declaring_class_;
    102   HeapReference<mirror::Class> type_;
    103   int32_t access_flags_;
    104   int32_t dex_field_index_;
    105   int32_t offset_;
    106 
    107   template<bool kTransactionActive>
    108   void SetDeclaringClass(mirror::Class* c) SHARED_REQUIRES(Locks::mutator_lock_) {
    109     SetFieldObject<kTransactionActive>(OFFSET_OF_OBJECT_MEMBER(Field, declaring_class_), c);
    110   }
    111 
    112   template<bool kTransactionActive>
    113   void SetType(mirror::Class* type) SHARED_REQUIRES(Locks::mutator_lock_) {
    114     SetFieldObject<kTransactionActive>(OFFSET_OF_OBJECT_MEMBER(Field, type_), type);
    115   }
    116 
    117   template<bool kTransactionActive>
    118   void SetAccessFlags(uint32_t flags) SHARED_REQUIRES(Locks::mutator_lock_) {
    119     SetField32<kTransactionActive>(OFFSET_OF_OBJECT_MEMBER(Field, access_flags_), flags);
    120   }
    121 
    122   template<bool kTransactionActive>
    123   void SetDexFieldIndex(uint32_t idx) SHARED_REQUIRES(Locks::mutator_lock_) {
    124     SetField32<kTransactionActive>(OFFSET_OF_OBJECT_MEMBER(Field, dex_field_index_), idx);
    125   }
    126 
    127   template<bool kTransactionActive>
    128   void SetOffset(uint32_t offset) SHARED_REQUIRES(Locks::mutator_lock_) {
    129     SetField32<kTransactionActive>(OFFSET_OF_OBJECT_MEMBER(Field, offset_), offset);
    130   }
    131 
    132   static GcRoot<Class> static_class_;  // java.lang.reflect.Field.class.
    133   static GcRoot<Class> array_class_;  // array of java.lang.reflect.Field.
    134 
    135   friend struct art::FieldOffsets;  // for verifying offset information
    136   DISALLOW_IMPLICIT_CONSTRUCTORS(Field);
    137 };
    138 
    139 }  // namespace mirror
    140 }  // namespace art
    141 
    142 #endif  // ART_RUNTIME_MIRROR_FIELD_H_
    143