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_METHOD_ITERATOR_H_
18#define ART_RUNTIME_DEX_METHOD_ITERATOR_H_
19
20#include <vector>
21
22#include "dex_file.h"
23
24namespace art {
25
26class DexMethodIterator {
27 public:
28  explicit DexMethodIterator(const std::vector<const DexFile*>& dex_files)
29      : dex_files_(dex_files),
30        found_next_(false),
31        dex_file_index_(0),
32        class_def_index_(0),
33        class_def_(NULL),
34        class_data_(NULL),
35        direct_method_(false) {
36    CHECK_NE(0U, dex_files_.size());
37  }
38
39  bool HasNext() {
40    if (found_next_) {
41      return true;
42    }
43    while (true) {
44      // End of DexFiles, we are done.
45      if (dex_file_index_ == dex_files_.size()) {
46        return false;
47      }
48      if (class_def_index_ == GetDexFileInternal().NumClassDefs()) {
49        // End of this DexFile, advance and retry.
50        class_def_index_ = 0;
51        dex_file_index_++;
52        continue;
53      }
54      if (class_def_ == NULL) {
55        class_def_ = &GetDexFileInternal().GetClassDef(class_def_index_);
56      }
57      if (class_data_ == NULL) {
58        class_data_ = GetDexFileInternal().GetClassData(*class_def_);
59        if (class_data_ == NULL) {
60          // empty class, such as a marker interface
61          // End of this class, advance and retry.
62          class_def_ = NULL;
63          class_def_index_++;
64          continue;
65        }
66      }
67      if (it_.get() == NULL) {
68        it_.reset(new ClassDataItemIterator(GetDexFileInternal(), class_data_));
69        // Skip fields
70        while (GetIterator().HasNextStaticField()) {
71          GetIterator().Next();
72        }
73        while (GetIterator().HasNextInstanceField()) {
74          GetIterator().Next();
75        }
76        direct_method_ = true;
77      }
78      if (direct_method_ && GetIterator().HasNextDirectMethod()) {
79        // Found method
80        found_next_ = true;
81        return true;
82      }
83      direct_method_ = false;
84      if (GetIterator().HasNextVirtualMethod()) {
85        // Found method
86        found_next_ = true;
87        return true;
88      }
89      // End of this class, advance and retry.
90      DCHECK(!GetIterator().HasNext());
91      it_.reset(NULL);
92      class_data_ = NULL;
93      class_def_ = NULL;
94      class_def_index_++;
95    }
96  }
97
98  void Next() {
99    found_next_ = false;
100    if (it_.get() != NULL) {
101      // Advance to next method if we currently are looking at a class.
102      GetIterator().Next();
103    }
104  }
105
106  const DexFile& GetDexFile() {
107    CHECK(HasNext());
108    return GetDexFileInternal();
109  }
110
111  uint32_t GetMemberIndex() {
112    CHECK(HasNext());
113    return GetIterator().GetMemberIndex();
114  }
115
116  InvokeType GetInvokeType() {
117    CHECK(HasNext());
118    CHECK(class_def_ != NULL);
119    return GetIterator().GetMethodInvokeType(*class_def_);
120  }
121
122 private:
123  ClassDataItemIterator& GetIterator() const {
124    CHECK(it_.get() != NULL);
125    return *it_.get();
126  }
127
128  const DexFile& GetDexFileInternal() const {
129    CHECK_LT(dex_file_index_, dex_files_.size());
130    const DexFile* dex_file = dex_files_[dex_file_index_];
131    CHECK(dex_file != NULL);
132    return *dex_file;
133  }
134
135  const std::vector<const DexFile*>& dex_files_;
136
137  bool found_next_;
138
139  uint32_t dex_file_index_;
140  uint32_t class_def_index_;
141  const DexFile::ClassDef* class_def_;
142  const byte* class_data_;
143  UniquePtr<ClassDataItemIterator> it_;
144  bool direct_method_;
145};
146
147}  // namespace art
148
149#endif  // ART_RUNTIME_DEX_METHOD_ITERATOR_H_
150