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 #ifndef ART_RUNTIME_DEX_FILE_INL_H_
18 #define ART_RUNTIME_DEX_FILE_INL_H_
19
20 #include "base/bit_utils.h"
21 #include "base/logging.h"
22 #include "base/stringpiece.h"
23 #include "dex_file.h"
24 #include "leb128.h"
25
26 namespace art {
27
GetStringLength(const StringId & string_id)28 inline int32_t DexFile::GetStringLength(const StringId& string_id) const {
29 const uint8_t* ptr = begin_ + string_id.string_data_off_;
30 return DecodeUnsignedLeb128(&ptr);
31 }
32
GetStringDataAndUtf16Length(const StringId & string_id,uint32_t * utf16_length)33 inline const char* DexFile::GetStringDataAndUtf16Length(const StringId& string_id,
34 uint32_t* utf16_length) const {
35 DCHECK(utf16_length != nullptr) << GetLocation();
36 const uint8_t* ptr = begin_ + string_id.string_data_off_;
37 *utf16_length = DecodeUnsignedLeb128(&ptr);
38 return reinterpret_cast<const char*>(ptr);
39 }
40
GetMethodSignature(const MethodId & method_id)41 inline const Signature DexFile::GetMethodSignature(const MethodId& method_id) const {
42 return Signature(this, GetProtoId(method_id.proto_idx_));
43 }
44
GetTryItems(const CodeItem & code_item,uint32_t offset)45 inline const DexFile::TryItem* DexFile::GetTryItems(const CodeItem& code_item, uint32_t offset) {
46 const uint16_t* insns_end_ = &code_item.insns_[code_item.insns_size_in_code_units_];
47 return reinterpret_cast<const TryItem*>
48 (RoundUp(reinterpret_cast<uintptr_t>(insns_end_), 4)) + offset;
49 }
50
DexFileStringEquals(const DexFile * df1,uint32_t sidx1,const DexFile * df2,uint32_t sidx2)51 static inline bool DexFileStringEquals(const DexFile* df1, uint32_t sidx1,
52 const DexFile* df2, uint32_t sidx2) {
53 uint32_t s1_len; // Note: utf16 length != mutf8 length.
54 const char* s1_data = df1->StringDataAndUtf16LengthByIdx(sidx1, &s1_len);
55 uint32_t s2_len;
56 const char* s2_data = df2->StringDataAndUtf16LengthByIdx(sidx2, &s2_len);
57 return (s1_len == s2_len) && (strcmp(s1_data, s2_data) == 0);
58 }
59
60 inline bool Signature::operator==(const Signature& rhs) const {
61 if (dex_file_ == nullptr) {
62 return rhs.dex_file_ == nullptr;
63 }
64 if (rhs.dex_file_ == nullptr) {
65 return false;
66 }
67 if (dex_file_ == rhs.dex_file_) {
68 return proto_id_ == rhs.proto_id_;
69 }
70 uint32_t lhs_shorty_len; // For a shorty utf16 length == mutf8 length.
71 const char* lhs_shorty_data = dex_file_->StringDataAndUtf16LengthByIdx(proto_id_->shorty_idx_,
72 &lhs_shorty_len);
73 StringPiece lhs_shorty(lhs_shorty_data, lhs_shorty_len);
74 {
75 uint32_t rhs_shorty_len;
76 const char* rhs_shorty_data =
77 rhs.dex_file_->StringDataAndUtf16LengthByIdx(rhs.proto_id_->shorty_idx_,
78 &rhs_shorty_len);
79 StringPiece rhs_shorty(rhs_shorty_data, rhs_shorty_len);
80 if (lhs_shorty != rhs_shorty) {
81 return false; // Shorty mismatch.
82 }
83 }
84 if (lhs_shorty[0] == 'L') {
85 const DexFile::TypeId& return_type_id = dex_file_->GetTypeId(proto_id_->return_type_idx_);
86 const DexFile::TypeId& rhs_return_type_id =
87 rhs.dex_file_->GetTypeId(rhs.proto_id_->return_type_idx_);
88 if (!DexFileStringEquals(dex_file_, return_type_id.descriptor_idx_,
89 rhs.dex_file_, rhs_return_type_id.descriptor_idx_)) {
90 return false; // Return type mismatch.
91 }
92 }
93 if (lhs_shorty.find('L', 1) != StringPiece::npos) {
94 const DexFile::TypeList* params = dex_file_->GetProtoParameters(*proto_id_);
95 const DexFile::TypeList* rhs_params = rhs.dex_file_->GetProtoParameters(*rhs.proto_id_);
96 // Both lists are empty or have contents, or else shorty is broken.
97 DCHECK_EQ(params == nullptr, rhs_params == nullptr);
98 if (params != nullptr) {
99 uint32_t params_size = params->Size();
100 DCHECK_EQ(params_size, rhs_params->Size()); // Parameter list size must match.
101 for (uint32_t i = 0; i < params_size; ++i) {
102 const DexFile::TypeId& param_id = dex_file_->GetTypeId(params->GetTypeItem(i).type_idx_);
103 const DexFile::TypeId& rhs_param_id =
104 rhs.dex_file_->GetTypeId(rhs_params->GetTypeItem(i).type_idx_);
105 if (!DexFileStringEquals(dex_file_, param_id.descriptor_idx_,
106 rhs.dex_file_, rhs_param_id.descriptor_idx_)) {
107 return false; // Parameter type mismatch.
108 }
109 }
110 }
111 }
112 return true;
113 }
114
115
116 } // namespace art
117
118 #endif // ART_RUNTIME_DEX_FILE_INL_H_
119