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      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 "method_type.h"
     24 #include "obj_ptr.h"
     25 #include "object.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     kInvokeVarHandle,
     52     kInvokeVarHandleExact,
     53     kInstanceGet,
     54     kInstancePut,
     55     kStaticGet,
     56     kStaticPut,
     57     kLastValidKind = kStaticPut,
     58     kFirstAccessorKind = kInstanceGet,
     59     kLastAccessorKind = kStaticPut,
     60     kLastInvokeKind = kInvokeVarHandleExact
     61   };
     62 
     63   Kind GetHandleKind() REQUIRES_SHARED(Locks::mutator_lock_) {
     64     const int32_t handle_kind = GetField32(OFFSET_OF_OBJECT_MEMBER(MethodHandle, handle_kind_));
     65     DCHECK(handle_kind >= 0 &&
     66            handle_kind <= static_cast<int32_t>(Kind::kLastValidKind));
     67     return static_cast<Kind>(handle_kind);
     68   }
     69 
     70   ALWAYS_INLINE ObjPtr<mirror::MethodType> GetMethodType() REQUIRES_SHARED(Locks::mutator_lock_);
     71 
     72   ALWAYS_INLINE ObjPtr<mirror::MethodType> GetNominalType() REQUIRES_SHARED(Locks::mutator_lock_);
     73 
     74   ArtField* GetTargetField() REQUIRES_SHARED(Locks::mutator_lock_) {
     75     return reinterpret_cast<ArtField*>(
     76         GetField64(OFFSET_OF_OBJECT_MEMBER(MethodHandle, art_field_or_method_)));
     77   }
     78 
     79   ArtMethod* GetTargetMethod() REQUIRES_SHARED(Locks::mutator_lock_) {
     80     return reinterpret_cast<ArtMethod*>(
     81         GetField64(OFFSET_OF_OBJECT_MEMBER(MethodHandle, art_field_or_method_)));
     82   }
     83 
     84   ALWAYS_INLINE ObjPtr<mirror::Class> GetTargetClass() REQUIRES_SHARED(Locks::mutator_lock_);
     85 
     86   // Gets the return type for a named invoke method, or nullptr if the invoke method is not
     87   // supported.
     88   static const char* GetReturnTypeDescriptor(const char* invoke_method_name);
     89 
     90  protected:
     91   void Initialize(uintptr_t art_field_or_method, Kind kind, Handle<MethodType> method_type)
     92       REQUIRES_SHARED(Locks::mutator_lock_);
     93 
     94  private:
     95   HeapReference<mirror::MethodHandle> cached_spread_invoker_;
     96   HeapReference<mirror::MethodType> nominal_type_;
     97   HeapReference<mirror::MethodType> method_type_;
     98   uint32_t handle_kind_;
     99   uint64_t art_field_or_method_;
    100 
    101  private:
    102   static MemberOffset CachedSpreadInvokerOffset() {
    103     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, cached_spread_invoker_));
    104   }
    105   static MemberOffset NominalTypeOffset() {
    106     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, nominal_type_));
    107   }
    108   static MemberOffset MethodTypeOffset() {
    109     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, method_type_));
    110   }
    111   static MemberOffset ArtFieldOrMethodOffset() {
    112     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, art_field_or_method_));
    113   }
    114   static MemberOffset HandleKindOffset() {
    115     return MemberOffset(OFFSETOF_MEMBER(MethodHandle, handle_kind_));
    116   }
    117 
    118   friend struct art::MethodHandleOffsets;  // for verifying offset information
    119   DISALLOW_IMPLICIT_CONSTRUCTORS(MethodHandle);
    120 };
    121 
    122 // C++ mirror of java.lang.invoke.MethodHandleImpl
    123 class MANAGED MethodHandleImpl : public MethodHandle {
    124  public:
    125   static ObjPtr<mirror::MethodHandleImpl> Create(Thread* const self,
    126                                                  uintptr_t art_field_or_method,
    127                                                  MethodHandle::Kind kind,
    128                                                  Handle<MethodType> method_type)
    129       REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
    130 
    131  private:
    132   static MemberOffset InfoOffset() {
    133     return MemberOffset(OFFSETOF_MEMBER(MethodHandleImpl, info_));
    134   }
    135 
    136   HeapReference<mirror::Object> info_;  // Unused by the runtime.
    137 
    138   friend struct art::MethodHandleImplOffsets;  // for verifying offset information
    139   DISALLOW_IMPLICIT_CONSTRUCTORS(MethodHandleImpl);
    140 };
    141 
    142 }  // namespace mirror
    143 }  // namespace art
    144 
    145 #endif  // ART_RUNTIME_MIRROR_METHOD_HANDLE_IMPL_H_
    146