Mercurial > hg > truffle
annotate src/share/vm/memory/filemap.hpp @ 21839:5363902eb0cc
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author | asaha |
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date | Mon, 29 Dec 2014 14:42:55 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_FILEMAP_HPP |
26 #define SHARE_VM_MEMORY_FILEMAP_HPP | |
27 | |
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28 #include "memory/metaspaceShared.hpp" |
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29 #include "memory/metaspace.hpp" |
1972 | 30 |
0 | 31 // Layout of the file: |
32 // header: dump of archive instance plus versioning info, datestamp, etc. | |
33 // [magic # = 0xF00BABA2] | |
34 // ... padding to align on page-boundary | |
35 // read-write space from CompactingPermGenGen | |
36 // read-only space from CompactingPermGenGen | |
37 // misc data (block offset table, string table, symbols, dictionary, etc.) | |
38 // tag(666) | |
39 | |
40 static const int JVM_IDENT_MAX = 256; | |
41 | |
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42 class Metaspace; |
0 | 43 |
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44 class SharedClassPathEntry VALUE_OBJ_CLASS_SPEC { |
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45 public: |
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46 const char *_name; |
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47 time_t _timestamp; // jar timestamp, 0 if is directory |
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48 long _filesize; // jar file size, -1 if is directory |
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49 bool is_dir() { |
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50 return _filesize == -1; |
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51 } |
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52 }; |
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53 |
6197 | 54 class FileMapInfo : public CHeapObj<mtInternal> { |
0 | 55 private: |
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56 friend class ManifestStream; |
0 | 57 enum { |
58 _invalid_version = -1, | |
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59 _current_version = 2 |
0 | 60 }; |
61 | |
62 bool _file_open; | |
63 int _fd; | |
18096 | 64 size_t _file_offset; |
0 | 65 |
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66 private: |
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67 static SharedClassPathEntry* _classpath_entry_table; |
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68 static int _classpath_entry_table_size; |
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69 static size_t _classpath_entry_size; |
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70 static bool _validating_classpath_entry_table; |
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71 |
0 | 72 // FileMapHeader describes the shared space data in the file to be |
73 // mapped. This structure gets written to a file. It is not a class, so | |
74 // that the compilers don't add any compiler-private data to it. | |
75 | |
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76 public: |
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77 struct FileMapHeaderBase : public CHeapObj<mtClass> { |
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78 virtual bool validate() = 0; |
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79 virtual void populate(FileMapInfo* info, size_t alignment) = 0; |
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80 }; |
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81 struct FileMapHeader : FileMapHeaderBase { |
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82 // Use data() and data_size() to memcopy to/from the FileMapHeader. We need to |
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83 // avoid read/writing the C++ vtable pointer. |
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84 static size_t data_size(); |
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85 char* data() { |
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86 return ((char*)this) + sizeof(FileMapHeaderBase); |
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87 } |
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88 |
0 | 89 int _magic; // identify file type. |
18096 | 90 int _crc; // header crc checksum. |
0 | 91 int _version; // (from enum, above.) |
92 size_t _alignment; // how shared archive should be aligned | |
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93 int _obj_alignment; // value of ObjectAlignmentInBytes |
0 | 94 |
95 struct space_info { | |
18096 | 96 int _crc; // crc checksum of the current space |
97 size_t _file_offset; // sizeof(this) rounded to vm page size | |
0 | 98 char* _base; // copy-on-write base address |
99 size_t _capacity; // for validity checking | |
100 size_t _used; // for setting space top on read | |
101 bool _read_only; // read only space? | |
102 bool _allow_exec; // executable code in space? | |
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103 } _space[MetaspaceShared::n_regions]; |
0 | 104 |
105 // The following fields are all sanity checks for whether this archive | |
106 // will function correctly with this JVM and the bootclasspath it's | |
107 // invoked with. | |
108 char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm | |
109 | |
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110 // The _paths_misc_info is a variable-size structure that records "miscellaneous" |
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111 // information during dumping. It is generated and validated by the |
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112 // SharedPathsMiscInfo class. See SharedPathsMiscInfo.hpp and sharedClassUtil.hpp for |
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113 // detailed description. |
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114 // |
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115 // The _paths_misc_info data is stored as a byte array in the archive file header, |
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116 // immediately after the _header field. This information is used only when |
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117 // checking the validity of the archive and is deallocated after the archive is loaded. |
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118 // |
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119 // Note that the _paths_misc_info does NOT include information for JAR files |
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120 // that existed during dump time. Their information is stored in _classpath_entry_table. |
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121 int _paths_misc_info_size; |
0 | 122 |
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123 // The following is a table of all the class path entries that were used |
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124 // during dumping. At run time, we require these files to exist and have the same |
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125 // size/modification time, or else the archive will refuse to load. |
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126 // |
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127 // All of these entries must be JAR files. The dumping process would fail if a non-empty |
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128 // directory was specified in the classpaths. If an empty directory was specified |
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129 // it is checked by the _paths_misc_info as described above. |
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130 // |
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131 // FIXME -- if JAR files in the tail of the list were specified but not used during dumping, |
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132 // they should be removed from this table, to save space and to avoid spurious |
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133 // loading failures during runtime. |
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134 int _classpath_entry_table_size; |
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135 size_t _classpath_entry_size; |
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136 SharedClassPathEntry* _classpath_entry_table; |
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137 |
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138 virtual bool validate(); |
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139 virtual void populate(FileMapInfo* info, size_t alignment); |
20527 | 140 int compute_crc(); |
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141 }; |
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142 |
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143 FileMapHeader * _header; |
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144 |
0 | 145 const char* _full_path; |
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146 char* _paths_misc_info; |
0 | 147 |
148 static FileMapInfo* _current_info; | |
149 | |
150 bool init_from_file(int fd); | |
151 void align_file_position(); | |
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152 bool validate_header_impl(); |
0 | 153 |
154 public: | |
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155 FileMapInfo(); |
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156 ~FileMapInfo(); |
0 | 157 |
158 static int current_version() { return _current_version; } | |
18096 | 159 int compute_header_crc(); |
20527 | 160 void set_header_crc(int crc) { _header->_crc = crc; } |
0 | 161 void populate_header(size_t alignment); |
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162 bool validate_header(); |
0 | 163 void invalidate(); |
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164 int version() { return _header->_version; } |
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165 size_t alignment() { return _header->_alignment; } |
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166 size_t space_capacity(int i) { return _header->_space[i]._capacity; } |
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167 char* region_base(int i) { return _header->_space[i]._base; } |
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168 struct FileMapHeader* header() { return _header; } |
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169 |
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170 static FileMapInfo* current_info() { |
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171 CDS_ONLY(return _current_info;) |
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172 NOT_CDS(return NULL;) |
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173 } |
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174 |
0 | 175 static void assert_mark(bool check); |
176 | |
177 // File manipulation. | |
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178 bool initialize() NOT_CDS_RETURN_(false); |
0 | 179 bool open_for_read(); |
180 void open_for_write(); | |
181 void write_header(); | |
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182 void write_space(int i, Metaspace* space, bool read_only); |
0 | 183 void write_region(int region, char* base, size_t size, |
184 size_t capacity, bool read_only, bool allow_exec); | |
185 void write_bytes(const void* buffer, int count); | |
186 void write_bytes_aligned(const void* buffer, int count); | |
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187 char* map_region(int i); |
0 | 188 void unmap_region(int i); |
18096 | 189 bool verify_region_checksum(int i); |
0 | 190 void close(); |
191 bool is_open() { return _file_open; } | |
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192 ReservedSpace reserve_shared_memory(); |
0 | 193 |
194 // JVM/TI RedefineClasses() support: | |
195 // Remap the shared readonly space to shared readwrite, private. | |
196 bool remap_shared_readonly_as_readwrite(); | |
197 | |
198 // Errors. | |
199 static void fail_stop(const char *msg, ...); | |
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200 static void fail_continue(const char *msg, ...); |
0 | 201 |
202 // Return true if given address is in the mapped shared space. | |
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203 bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); |
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204 void print_shared_spaces() NOT_CDS_RETURN; |
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205 |
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206 static size_t shared_spaces_size() { |
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207 return align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
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208 SharedMiscDataSize + SharedMiscCodeSize, |
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209 os::vm_allocation_granularity()); |
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210 } |
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211 |
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212 // Stop CDS sharing and unmap CDS regions. |
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213 static void stop_sharing_and_unmap(const char* msg); |
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214 |
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215 static void allocate_classpath_entry_table(); |
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216 bool validate_classpath_entry_table(); |
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217 |
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218 static SharedClassPathEntry* shared_classpath(int index) { |
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219 char* p = (char*)_classpath_entry_table; |
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220 p += _classpath_entry_size * index; |
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221 return (SharedClassPathEntry*)p; |
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222 } |
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223 static const char* shared_classpath_name(int index) { |
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224 return shared_classpath(index)->_name; |
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225 } |
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226 |
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227 static int get_number_of_share_classpaths() { |
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228 return _classpath_entry_table_size; |
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229 } |
0 | 230 }; |
1972 | 231 |
232 #endif // SHARE_VM_MEMORY_FILEMAP_HPP |