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_TYPE_H_ 18 #define ART_RUNTIME_MIRROR_METHOD_TYPE_H_ 19 20 #include "base/utils.h" 21 #include "object_array.h" 22 #include "object.h" 23 #include "string.h" 24 25 namespace art { 26 27 struct MethodTypeOffsets; 28 29 namespace mirror { 30 31 // C++ mirror of java.lang.invoke.MethodType 32 class MANAGED MethodType : public Object { 33 public: 34 static MethodType* Create(Thread* const self, 35 Handle<Class> return_type, 36 Handle<ObjectArray<Class>> param_types) 37 REQUIRES_SHARED(Locks::mutator_lock_) REQUIRES(!Roles::uninterruptible_); 38 39 static MethodType* CloneWithoutLeadingParameter(Thread* const self, 40 ObjPtr<MethodType> method_type) 41 REQUIRES_SHARED(Locks::mutator_lock_); 42 StaticClass()43 static Class* StaticClass() REQUIRES_SHARED(Locks::mutator_lock_) { 44 return static_class_.Read(); 45 } 46 GetPTypes()47 ObjectArray<Class>* GetPTypes() REQUIRES_SHARED(Locks::mutator_lock_) { 48 return GetFieldObject<ObjectArray<Class>>(OFFSET_OF_OBJECT_MEMBER(MethodType, p_types_)); 49 } 50 GetNumberOfPTypes()51 int GetNumberOfPTypes() REQUIRES_SHARED(Locks::mutator_lock_) { 52 return GetPTypes()->GetLength(); 53 } 54 55 // Number of virtual registers required to hold the parameters for 56 // this method type. 57 size_t NumberOfVRegs() REQUIRES_SHARED(Locks::mutator_lock_); 58 GetRType()59 Class* GetRType() REQUIRES_SHARED(Locks::mutator_lock_) { 60 return GetFieldObject<Class>(OFFSET_OF_OBJECT_MEMBER(MethodType, r_type_)); 61 } 62 63 static void SetClass(Class* klass) REQUIRES_SHARED(Locks::mutator_lock_); 64 static void ResetClass() REQUIRES_SHARED(Locks::mutator_lock_); 65 static void VisitRoots(RootVisitor* visitor) REQUIRES_SHARED(Locks::mutator_lock_); 66 67 // Returns true iff. |this| is an exact match for method type |target|, i.e 68 // iff. they have the same return types and parameter types. 69 bool IsExactMatch(MethodType* target) REQUIRES_SHARED(Locks::mutator_lock_); 70 71 // Returns true iff. |this| can be converted to match |target| method type, i.e 72 // iff. they have convertible return types and parameter types. 73 bool IsConvertible(MethodType* target) REQUIRES_SHARED(Locks::mutator_lock_); 74 75 // Returns the pretty descriptor for this method type, suitable for display in 76 // exception messages and the like. 77 std::string PrettyDescriptor() REQUIRES_SHARED(Locks::mutator_lock_); 78 79 private: FormOffset()80 static MemberOffset FormOffset() { 81 return MemberOffset(OFFSETOF_MEMBER(MethodType, form_)); 82 } 83 MethodDescriptorOffset()84 static MemberOffset MethodDescriptorOffset() { 85 return MemberOffset(OFFSETOF_MEMBER(MethodType, method_descriptor_)); 86 } 87 PTypesOffset()88 static MemberOffset PTypesOffset() { 89 return MemberOffset(OFFSETOF_MEMBER(MethodType, p_types_)); 90 } 91 RTypeOffset()92 static MemberOffset RTypeOffset() { 93 return MemberOffset(OFFSETOF_MEMBER(MethodType, r_type_)); 94 } 95 WrapAltOffset()96 static MemberOffset WrapAltOffset() { 97 return MemberOffset(OFFSETOF_MEMBER(MethodType, wrap_alt_)); 98 } 99 100 HeapReference<Object> form_; // Unused in the runtime 101 HeapReference<String> method_descriptor_; // Unused in the runtime 102 HeapReference<ObjectArray<Class>> p_types_; 103 HeapReference<Class> r_type_; 104 HeapReference<Object> wrap_alt_; // Unused in the runtime 105 106 static GcRoot<Class> static_class_; // java.lang.invoke.MethodType.class 107 108 friend struct art::MethodTypeOffsets; // for verifying offset information 109 DISALLOW_IMPLICIT_CONSTRUCTORS(MethodType); 110 }; 111 112 } // namespace mirror 113 } // namespace art 114 115 #endif // ART_RUNTIME_MIRROR_METHOD_TYPE_H_ 116