method_helper.cc revision cb6b0f31ede2275e79e6199ec391147585a37a2a 
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 "method_helper-inl.h"
18
19#include "class_linker.h"
20#include "dex_file-inl.h"
21#include "handle_scope-inl.h"
22#include "mirror/art_method-inl.h"
23#include "mirror/dex_cache.h"
24#include "runtime.h"
25
26namespace art {
27
28mirror::String* MethodHelper::GetNameAsString(Thread* self) {
29  const DexFile* dex_file = method_->GetDexFile();
30  mirror::ArtMethod* method = method_->GetInterfaceMethodIfProxy();
31  uint32_t dex_method_idx = method->GetDexMethodIndex();
32  const DexFile::MethodId& method_id = dex_file->GetMethodId(dex_method_idx);
33  StackHandleScope<1> hs(self);
34  Handle<mirror::DexCache> dex_cache(hs.NewHandle(method->GetDexCache()));
35  return Runtime::Current()->GetClassLinker()->ResolveString(*dex_file, method_id.name_idx_,
36                                                             dex_cache);
37}
38
39bool MethodHelper::HasSameSignatureWithDifferentClassLoaders(MethodHelper* other) {
40  if (UNLIKELY(GetReturnType() != other->GetReturnType())) {
41    return false;
42  }
43  const DexFile::TypeList* types = method_->GetParameterTypeList();
44  const DexFile::TypeList* other_types = other->method_->GetParameterTypeList();
45  if (types == nullptr) {
46    return (other_types == nullptr) || (other_types->Size() == 0);
47  } else if (UNLIKELY(other_types == nullptr)) {
48    return types->Size() == 0;
49  }
50  uint32_t num_types = types->Size();
51  if (UNLIKELY(num_types != other_types->Size())) {
52    return false;
53  }
54  for (uint32_t i = 0; i < num_types; ++i) {
55    mirror::Class* param_type = GetClassFromTypeIdx(types->GetTypeItem(i).type_idx_);
56    mirror::Class* other_param_type =
57        other->GetClassFromTypeIdx(other_types->GetTypeItem(i).type_idx_);
58    if (UNLIKELY(param_type != other_param_type)) {
59      return false;
60    }
61  }
62  return true;
63}
64
65uint32_t MethodHelper::FindDexMethodIndexInOtherDexFile(const DexFile& other_dexfile)
66    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
67  mirror::ArtMethod* method = GetMethod();
68  const DexFile* dexfile = method->GetDexFile();
69  if (dexfile == &other_dexfile) {
70    return method->GetDexMethodIndex();
71  }
72  const DexFile::MethodId& mid = dexfile->GetMethodId(method->GetDexMethodIndex());
73  const char* mid_declaring_class_descriptor = dexfile->StringByTypeIdx(mid.class_idx_);
74  const DexFile::StringId* other_descriptor =
75      other_dexfile.FindStringId(mid_declaring_class_descriptor);
76  if (other_descriptor != nullptr) {
77    const DexFile::TypeId* other_type_id =
78        other_dexfile.FindTypeId(other_dexfile.GetIndexForStringId(*other_descriptor));
79    if (other_type_id != nullptr) {
80      const char* mid_name = dexfile->GetMethodName(mid);
81      const DexFile::StringId* other_name = other_dexfile.FindStringId(mid_name);
82      if (other_name != nullptr) {
83        uint16_t other_return_type_idx;
84        std::vector<uint16_t> other_param_type_idxs;
85        bool success = other_dexfile.CreateTypeList(
86            dexfile->GetMethodSignature(mid).ToString(), &other_return_type_idx,
87            &other_param_type_idxs);
88        if (success) {
89          const DexFile::ProtoId* other_sig =
90              other_dexfile.FindProtoId(other_return_type_idx, other_param_type_idxs);
91          if (other_sig != nullptr) {
92            const  DexFile::MethodId* other_mid = other_dexfile.FindMethodId(
93                *other_type_id, *other_name, *other_sig);
94            if (other_mid != nullptr) {
95              return other_dexfile.GetIndexForMethodId(*other_mid);
96            }
97          }
98        }
99      }
100    }
101  }
102  return DexFile::kDexNoIndex;
103}
104
105uint32_t MethodHelper::FindDexMethodIndexInOtherDexFile(const DexFile& other_dexfile,
106                                                        uint32_t name_and_signature_idx)
107    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
108  mirror::ArtMethod* method = GetMethod();
109  const DexFile* dexfile = method->GetDexFile();
110  const uint32_t dex_method_idx = method->GetDexMethodIndex();
111  const DexFile::MethodId& mid = dexfile->GetMethodId(dex_method_idx);
112  const DexFile::MethodId& name_and_sig_mid = other_dexfile.GetMethodId(name_and_signature_idx);
113  DCHECK_STREQ(dexfile->GetMethodName(mid), other_dexfile.GetMethodName(name_and_sig_mid));
114  DCHECK_EQ(dexfile->GetMethodSignature(mid), other_dexfile.GetMethodSignature(name_and_sig_mid));
115  if (dexfile == &other_dexfile) {
116    return dex_method_idx;
117  }
118  const char* mid_declaring_class_descriptor = dexfile->StringByTypeIdx(mid.class_idx_);
119  const DexFile::StringId* other_descriptor =
120      other_dexfile.FindStringId(mid_declaring_class_descriptor);
121  if (other_descriptor != nullptr) {
122    const DexFile::TypeId* other_type_id =
123        other_dexfile.FindTypeId(other_dexfile.GetIndexForStringId(*other_descriptor));
124    if (other_type_id != nullptr) {
125      const DexFile::MethodId* other_mid = other_dexfile.FindMethodId(
126          *other_type_id, other_dexfile.GetStringId(name_and_sig_mid.name_idx_),
127          other_dexfile.GetProtoId(name_and_sig_mid.proto_idx_));
128      if (other_mid != nullptr) {
129        return other_dexfile.GetIndexForMethodId(*other_mid);
130      }
131    }
132  }
133  return DexFile::kDexNoIndex;
134}
135
136}  // namespace art
137