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      1 /*
      2  * Copyright (C) 2017 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_HANDLES_LOOKUP_H_
     18 #define ART_RUNTIME_MIRROR_METHOD_HANDLES_LOOKUP_H_
     19 
     20 #include "base/utils.h"
     21 #include "handle.h"
     22 #include "obj_ptr.h"
     23 #include "object.h"
     24 
     25 namespace art {
     26 
     27 struct MethodHandlesLookupOffsets;
     28 class RootVisitor;
     29 
     30 namespace mirror {
     31 
     32 class MethodHandle;
     33 class MethodType;
     34 
     35 // C++ mirror of java.lang.invoke.MethodHandles.Lookup
     36 class MANAGED MethodHandlesLookup : public Object {
     37  public:
     38   static ObjPtr<mirror::MethodHandlesLookup> Create(Thread* const self, Handle<Class> lookup_class)
     39       REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_);
     40 
     41   // Returns the result of java.lang.invoke.MethodHandles.lookup().
     42   static ObjPtr<mirror::MethodHandlesLookup> GetDefault(Thread* const self)
     43       REQUIRES_SHARED(Locks::mutator_lock_);
     44 
     45   // Find constructor using java.lang.invoke.MethodHandles$Lookup.findConstructor().
     46   ObjPtr<mirror::MethodHandle> FindConstructor(Thread* const self,
     47                                                Handle<Class> klass,
     48                                                Handle<MethodType> method_type)
     49       REQUIRES_SHARED(Locks::mutator_lock_);
     50 
     51  private:
     52   static MemberOffset AllowedModesOffset() {
     53     return MemberOffset(OFFSETOF_MEMBER(MethodHandlesLookup, allowed_modes_));
     54   }
     55 
     56   static MemberOffset LookupClassOffset() {
     57     return MemberOffset(OFFSETOF_MEMBER(MethodHandlesLookup, lookup_class_));
     58   }
     59 
     60   HeapReference<mirror::Class> lookup_class_;
     61 
     62   int32_t allowed_modes_;
     63 
     64   friend struct art::MethodHandlesLookupOffsets;  // for verifying offset information
     65   DISALLOW_IMPLICIT_CONSTRUCTORS(MethodHandlesLookup);
     66 };
     67 
     68 }  // namespace mirror
     69 }  // namespace art
     70 
     71 #endif  // ART_RUNTIME_MIRROR_METHOD_HANDLES_LOOKUP_H_
     72