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/logging.h"
21#include "base/stringpiece.h"
22#include "dex_file.h"
23#include "leb128.h"
24#include "utils.h"
25
26namespace art {
27
28inline int32_t DexFile::GetStringLength(const StringId& string_id) const {
29  const byte* ptr = begin_ + string_id.string_data_off_;
30  return DecodeUnsignedLeb128(&ptr);
31}
32
33inline const char* DexFile::GetStringDataAndUtf16Length(const StringId& string_id,
34                                                        uint32_t* utf16_length) const {
35  DCHECK(utf16_length != NULL) << GetLocation();
36  const byte* ptr = begin_ + string_id.string_data_off_;
37  *utf16_length = DecodeUnsignedLeb128(&ptr);
38  return reinterpret_cast<const char*>(ptr);
39}
40
41inline const Signature DexFile::GetMethodSignature(const MethodId& method_id) const {
42  return Signature(this, GetProtoId(method_id.proto_idx_));
43}
44
45inline 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
51static 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
60inline 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