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: AllowedModesOffset()52 static MemberOffset AllowedModesOffset() { 53 return MemberOffset(OFFSETOF_MEMBER(MethodHandlesLookup, allowed_modes_)); 54 } 55 LookupClassOffset()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