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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_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 
     43   static Class* StaticClass() REQUIRES_SHARED(Locks::mutator_lock_) {
     44     return static_class_.Read();
     45   }
     46 
     47   ObjectArray<Class>* GetPTypes() REQUIRES_SHARED(Locks::mutator_lock_) {
     48     return GetFieldObject<ObjectArray<Class>>(OFFSET_OF_OBJECT_MEMBER(MethodType, p_types_));
     49   }
     50 
     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 
     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:
     80   static MemberOffset FormOffset() {
     81     return MemberOffset(OFFSETOF_MEMBER(MethodType, form_));
     82   }
     83 
     84   static MemberOffset MethodDescriptorOffset() {
     85     return MemberOffset(OFFSETOF_MEMBER(MethodType, method_descriptor_));
     86   }
     87 
     88   static MemberOffset PTypesOffset() {
     89     return MemberOffset(OFFSETOF_MEMBER(MethodType, p_types_));
     90   }
     91 
     92   static MemberOffset RTypeOffset() {
     93     return MemberOffset(OFFSETOF_MEMBER(MethodType, r_type_));
     94   }
     95 
     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