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 "obj_ptr.h" 21 #include "gc_root.h" 22 #include "object.h" 23 #include "handle.h" 24 #include "utils.h" 25 26 namespace art { 27 28 struct MethodHandlesLookupOffsets; 29 class RootVisitor; 30 31 namespace mirror { 32 33 class MethodHandle; 34 class MethodType; 35 36 // C++ mirror of java.lang.invoke.MethodHandles.Lookup 37 class MANAGED MethodHandlesLookup : public Object { 38 public: 39 static mirror::MethodHandlesLookup* Create(Thread* const self, 40 Handle<Class> lookup_class) 41 REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_); 42 StaticClass()43 static mirror::Class* StaticClass() REQUIRES_SHARED(Locks::mutator_lock_) { 44 return static_class_.Read(); 45 } 46 47 static void SetClass(Class* klass) REQUIRES_SHARED(Locks::mutator_lock_); 48 static void ResetClass() REQUIRES_SHARED(Locks::mutator_lock_); 49 static void VisitRoots(RootVisitor* visitor) REQUIRES_SHARED(Locks::mutator_lock_); 50 51 // Returns the result of java.lang.invoke.MethodHandles.lookup(). 52 static mirror::MethodHandlesLookup* GetDefault(Thread* const self) 53 REQUIRES_SHARED(Locks::mutator_lock_); 54 55 // Find constructor using java.lang.invoke.MethodHandles$Lookup.findConstructor(). 56 mirror::MethodHandle* FindConstructor(Thread* const self, 57 Handle<Class> klass, 58 Handle<MethodType> method_type) 59 REQUIRES_SHARED(Locks::mutator_lock_); 60 61 private: AllowedModesOffset()62 static MemberOffset AllowedModesOffset() { 63 return MemberOffset(OFFSETOF_MEMBER(MethodHandlesLookup, allowed_modes_)); 64 } 65 LookupClassOffset()66 static MemberOffset LookupClassOffset() { 67 return MemberOffset(OFFSETOF_MEMBER(MethodHandlesLookup, lookup_class_)); 68 } 69 70 HeapReference<mirror::Class> lookup_class_; 71 72 int32_t allowed_modes_; 73 74 static GcRoot<mirror::Class> static_class_; // java.lang.invoke.MethodHandles.Lookup.class 75 76 friend struct art::MethodHandlesLookupOffsets; // for verifying offset information 77 DISALLOW_IMPLICIT_CONSTRUCTORS(MethodHandlesLookup); 78 }; 79 80 } // namespace mirror 81 } // namespace art 82 83 #endif // ART_RUNTIME_MIRROR_METHOD_HANDLES_LOOKUP_H_ 84