1 /*
2  * Copyright (C) 2011 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 #include "signature-inl.h"
18 
19 #include <string.h>
20 
21 #include <ostream>
22 #include <type_traits>
23 
24 namespace art {
25 
26 using dex::TypeList;
27 
ToString() const28 std::string Signature::ToString() const {
29   if (dex_file_ == nullptr) {
30     CHECK(proto_id_ == nullptr);
31     return "<no signature>";
32   }
33   const TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
34   std::string result;
35   if (params == nullptr) {
36     result += "()";
37   } else {
38     result += "(";
39     for (uint32_t i = 0; i < params->Size(); ++i) {
40       result += dex_file_->GetTypeDescriptorView(params->GetTypeItem(i).type_idx_);
41     }
42     result += ")";
43   }
44   result += dex_file_->GetTypeDescriptorView(proto_id_->return_type_idx_);
45   return result;
46 }
47 
GetNumberOfParameters() const48 uint32_t Signature::GetNumberOfParameters() const {
49   const TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
50   return (params != nullptr) ? params->Size() : 0;
51 }
52 
IsVoid() const53 bool Signature::IsVoid() const {
54   const char* return_type = dex_file_->GetReturnTypeDescriptor(*proto_id_);
55   return strcmp(return_type, "V") == 0;
56 }
57 
operator ==(std::string_view rhs) const58 bool Signature::operator==(std::string_view rhs) const {
59   if (dex_file_ == nullptr) {
60     return false;
61   }
62   std::string_view tail(rhs);
63   if (!tail.starts_with("(")) {
64     return false;  // Invalid signature
65   }
66   tail.remove_prefix(1);  // "(";
67   const TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
68   if (params != nullptr) {
69     for (uint32_t i = 0; i < params->Size(); ++i) {
70       std::string_view param = dex_file_->GetTypeDescriptorView(params->GetTypeItem(i).type_idx_);
71       if (!tail.starts_with(param)) {
72         return false;
73       }
74       tail.remove_prefix(param.length());
75     }
76   }
77   if (!tail.starts_with(")")) {
78     return false;
79   }
80   tail.remove_prefix(1);  // ")";
81   return tail == dex_file_->GetTypeDescriptorView(proto_id_->return_type_idx_);
82 }
83 
operator <<(std::ostream & os,const Signature & sig)84 std::ostream& operator<<(std::ostream& os, const Signature& sig) {
85   return os << sig.ToString();
86 }
87 
88 }  // namespace art
89