Home | History | Annotate | Download | only in mirror 
      1 /*
      2  * Copyright (C) 2016 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_METHOD_HANDLE_IMPL_H_
     18 #define ART_RUNTIME_MIRROR_METHOD_HANDLE_IMPL_H_
     19 
     20 #include "art_field.h"
     21 #include "art_method.h"
     22 #include "class.h"
     23 #include "gc_root.h"
     24 #include "object.h"
     25 #include "method_type.h"
     26 
     27 namespace art {
     28 
     29 struct MethodHandleOffsets;
     30 struct MethodHandleImplOffsets;
     31 
     32 namespace mirror {
     33 
     34 // C++ mirror of java.lang.invoke.MethodHandle
     35 class MANAGED MethodHandle : public Object {
     36  public:
     37   // Defines the behaviour of a given method handle. The behaviour
     38   // of a handle of a given kind is identical to the dex bytecode behaviour
     39   // of the equivalent instruction.
     40   //
     41   // NOTE: These must be kept in sync with the constants defined in
     42   // java.lang.invoke.MethodHandle.
     43   enum Kind {
     44     kInvokeVirtual = 0,
     45     kInvokeSuper,
     46     kInvokeDirect,
     47     kInvokeStatic,
     48     kInvokeInterface,
     49     kInvokeTransform,
     50     kInvokeCallSiteTransform,
     51     kInstanceGet,
     52     kInstancePut,
     53     kStaticGet,
     54     kStaticPut,
     55     kLastValidKind = kStaticPut,
     56     kFirstAccessorKind = kInstanceGet,
     57     kLastAccessorKind = kStaticPut,
     58     kLastInvokeKind = kInvokeCallSiteTransform
     59   };
     60 
     61   Kind GetHandleKind() REQUIRES_SHARED(Locks::mutator_lock_) {
     62     const int32_t handle_kind = GetField32(OFFSET_OF_OBJECT_MEMBER(MethodHandle, handle_kind_));
     63     DCHECK(handle_kind >= 0 &&
     64            handle_kind <= static_cast<int32_t>(Kind::kLastValidKind));
     65     return static_cast<Kind>(handle_kind);
     66   }
     67 
     68   ALWAYS_INLINE mirror::MethodType* GetMethodType() REQUIRES_SHARED(Locks::mutator_lock_);
     69 
     70   ALWAYS_INLINE mirror::MethodType* GetNominalType() REQUIRES_SHARED(Locks::mutator_lock_);
     71 
     72   ArtField* GetTargetField() REQUIRES_SHARED(Locks::mutator_lock_) {
     73     return reinterpret_cast<ArtField*>(
     74         GetField64(OFFSET_OF_OBJECT_MEMBER(MethodHandle, art_field_or_method_)));
     75   }
     76 
     77   ArtMethod* GetTargetMethod() REQUIRES_SHARED(Locks::mutator_lock_) {
     78     return reinterpret_cast<ArtMethod*>(
     79         GetField64(OFFSET_OF_OBJECT_MEMBER(MethodHandle, art_field_or_method_)));
     80   }
     81 
     82   ALWAYS_INLINE ObjPtr<mirror::Class> GetTargetClass() REQUIRES_SHARED(Locks::mutator_lock_);
     83 
     84   static mirror::Class* StaticClass() REQUIRES_SHARED(Locks::mutator_lock_);
     85 
     86  protected:
     87   void Initialize(uintptr_t art_field_or_method, Kind kind, Handle<MethodType> method_type)
     88       REQUIRES_SHARED(Locks::mutator_lock_);
     89 
     90  private:
     91   HeapReference<mirror::MethodHandle> cached_spread_invoker_;
     92   HeapReference<mirror::MethodType> nominal_type_;
     93   HeapReference<mirror::MethodType> method_type_;
     94   uint32_t handle_kind_;
     95   uint64_t art_field_or_method_;
     96 
     97  private:
     98   static MemberOffset CachedSpreadInvokerOffset() {
     99     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, cached_spread_invoker_));
    100   }
    101   static MemberOffset NominalTypeOffset() {
    102     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, nominal_type_));
    103   }
    104   static MemberOffset MethodTypeOffset() {
    105     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, method_type_));
    106   }
    107   static MemberOffset ArtFieldOrMethodOffset() {
    108     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, art_field_or_method_));
    109   }
    110   static MemberOffset HandleKindOffset() {
    111     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, handle_kind_));
    112   }
    113 
    114   friend struct art::MethodHandleOffsets;  // for verifying offset information
    115   DISALLOW_IMPLICIT_CONSTRUCTORS(MethodHandle);
    116 };
    117 
    118 // C++ mirror of java.lang.invoke.MethodHandleImpl
    119 class MANAGED MethodHandleImpl : public MethodHandle {
    120  public:
    121   static mirror::MethodHandleImpl* Create(Thread* const self,
    122                                           uintptr_t art_field_or_method,
    123                                           MethodHandle::Kind kind,
    124                                           Handle<MethodType> method_type)
    125       REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
    126 
    127   static mirror::Class* StaticClass() REQUIRES_SHARED(Locks::mutator_lock_);
    128 
    129   static void SetClass(Class* klass) REQUIRES_SHARED(Locks::mutator_lock_);
    130   static void ResetClass() REQUIRES_SHARED(Locks::mutator_lock_);
    131   static void VisitRoots(RootVisitor* visitor) REQUIRES_SHARED(Locks::mutator_lock_);
    132 
    133  private:
    134   static MemberOffset InfoOffset() {
    135     return MemberOffset(OFFSETOF_MEMBER(MethodHandleImpl, info_));
    136   }
    137 
    138   HeapReference<mirror::Object> info_;  // Unused by the runtime.
    139   static GcRoot<mirror::Class> static_class_;  // java.lang.invoke.MethodHandleImpl.class
    140 
    141   friend struct art::MethodHandleImplOffsets;  // for verifying offset information
    142   DISALLOW_IMPLICIT_CONSTRUCTORS(MethodHandleImpl);
    143 };
    144 
    145 }  // namespace mirror
    146 }  // namespace art
    147 
    148 #endif  // ART_RUNTIME_MIRROR_METHOD_HANDLE_IMPL_H_
    149