image.h revision 90ca5c0301651101de0e363842e5d08ae65233f7 
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_IMAGE_H_
18#define ART_RUNTIME_IMAGE_H_
19
20#include <string.h>
21
22#include "globals.h"
23#include "mirror/object.h"
24#include "utils.h"
25
26namespace art {
27
28// header of image files written by ImageWriter, read and validated by Space.
29class PACKED(4) ImageHeader {
30 public:
31  ImageHeader() : compile_pic_(0) {}
32
33  ImageHeader(uint32_t image_begin,
34              uint32_t image_size_,
35              uint32_t image_bitmap_offset,
36              uint32_t image_bitmap_size,
37              uint32_t image_roots,
38              uint32_t oat_checksum,
39              uint32_t oat_file_begin,
40              uint32_t oat_data_begin,
41              uint32_t oat_data_end,
42              uint32_t oat_file_end,
43              bool compile_pic_);
44
45  bool IsValid() const;
46  const char* GetMagic() const;
47
48  byte* GetImageBegin() const {
49    return reinterpret_cast<byte*>(image_begin_);
50  }
51
52  size_t GetImageSize() const {
53    return static_cast<uint32_t>(image_size_);
54  }
55
56  size_t GetImageBitmapOffset() const {
57    return image_bitmap_offset_;
58  }
59
60  size_t GetImageBitmapSize() const {
61    return image_bitmap_size_;
62  }
63
64  uint32_t GetOatChecksum() const {
65    return oat_checksum_;
66  }
67
68  void SetOatChecksum(uint32_t oat_checksum) {
69    oat_checksum_ = oat_checksum;
70  }
71
72  byte* GetOatFileBegin() const {
73    return reinterpret_cast<byte*>(oat_file_begin_);
74  }
75
76  byte* GetOatDataBegin() const {
77    return reinterpret_cast<byte*>(oat_data_begin_);
78  }
79
80  byte* GetOatDataEnd() const {
81    return reinterpret_cast<byte*>(oat_data_end_);
82  }
83
84  byte* GetOatFileEnd() const {
85    return reinterpret_cast<byte*>(oat_file_end_);
86  }
87
88  off_t GetPatchDelta() const {
89    return patch_delta_;
90  }
91
92  size_t GetBitmapOffset() const {
93    return RoundUp(image_size_, kPageSize);
94  }
95
96  static std::string GetOatLocationFromImageLocation(const std::string& image) {
97    std::string oat_filename = image;
98    if (oat_filename.length() <= 3) {
99      oat_filename += ".oat";
100    } else {
101      oat_filename.replace(oat_filename.length() - 3, 3, "oat");
102    }
103    return oat_filename;
104  }
105
106  enum ImageRoot {
107    kResolutionMethod,
108    kImtConflictMethod,
109    kImtUnimplementedMethod,
110    kDefaultImt,
111    kCalleeSaveMethod,
112    kRefsOnlySaveMethod,
113    kRefsAndArgsSaveMethod,
114    kDexCaches,
115    kClassRoots,
116    kImageRootsMax,
117  };
118
119  mirror::Object* GetImageRoot(ImageRoot image_root) const
120      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
121  mirror::ObjectArray<mirror::Object>* GetImageRoots() const;
122
123  void RelocateImage(off_t delta);
124
125  bool CompilePic() const {
126    return compile_pic_ != 0;
127  }
128
129 private:
130  static const byte kImageMagic[4];
131  static const byte kImageVersion[4];
132
133  byte magic_[4];
134  byte version_[4];
135
136  // Required base address for mapping the image.
137  uint32_t image_begin_;
138
139  // Image size, not page aligned.
140  uint32_t image_size_;
141
142  // Image bitmap offset in the file.
143  uint32_t image_bitmap_offset_;
144
145  // Size of the image bitmap.
146  uint32_t image_bitmap_size_;
147
148  // Checksum of the oat file we link to for load time sanity check.
149  uint32_t oat_checksum_;
150
151  // Start address for oat file. Will be before oat_data_begin_ for .so files.
152  uint32_t oat_file_begin_;
153
154  // Required oat address expected by image Method::GetCode() pointers.
155  uint32_t oat_data_begin_;
156
157  // End of oat data address range for this image file.
158  uint32_t oat_data_end_;
159
160  // End of oat file address range. will be after oat_data_end_ for
161  // .so files. Used for positioning a following alloc spaces.
162  uint32_t oat_file_end_;
163
164  // The total delta that this image has been patched.
165  int32_t patch_delta_;
166
167  // Absolute address of an Object[] of objects needed to reinitialize from an image.
168  uint32_t image_roots_;
169
170  // Boolean (0 or 1) to denote if the image was compiled with --compile-pic option
171  const uint32_t compile_pic_;
172
173  friend class ImageWriter;
174};
175
176}  // namespace art
177
178#endif  // ART_RUNTIME_IMAGE_H_
179