36 // [magic # = 0xF00BABA2] 37 // ... padding to align on page-boundary 38 // read-write space 39 // read-only space 40 // misc data (block offset table, string table, symbols, dictionary, etc.) 41 // tag(666) 42 43 static const int JVM_IDENT_MAX = 256; 44 45 class SharedClassPathEntry { 46 protected: 47 bool _is_dir; 48 time_t _timestamp; // jar/jimage timestamp, 0 if is directory or other 49 long _filesize; // jar/jimage file size, -1 if is directory, -2 if other 50 Array<char>* _name; 51 Array<u1>* _manifest; 52 53 public: 54 void init(const char* name, TRAPS); 55 void metaspace_pointers_do(MetaspaceClosure* it); 56 bool validate(); 57 58 // The _timestamp only gets set for jar files and "modules" jimage. 59 bool is_jar_or_bootimage() { 60 return _timestamp != 0; 61 } 62 bool is_dir() { return _is_dir; } 63 bool is_modules_image() { return ClassLoader::is_modules_image(name()); } 64 time_t timestamp() const { return _timestamp; } 65 long filesize() const { return _filesize; } 66 const char* name() const { return _name->data(); } 67 const char* manifest() const { 68 return (_manifest == NULL) ? NULL : (const char*)_manifest->data(); 69 } 70 int manifest_size() const { 71 return (_manifest == NULL) ? 0 : _manifest->length(); 72 } 73 }; 74 75 class FileMapInfo : public CHeapObj<mtInternal> { 76 private: 77 friend class ManifestStream; 78 enum { 79 _invalid_version = -1, 80 _current_version = 3 81 }; 82 83 bool _file_open; 84 int _fd; 85 size_t _file_offset; 86 87 private: 88 static Array<u8>* _classpath_entry_table; 89 static int _classpath_entry_table_size; 90 static size_t _classpath_entry_size; 91 static bool _validating_classpath_entry_table; 92 93 // FileMapHeader describes the shared space data in the file to be 94 // mapped. This structure gets written to a file. It is not a class, so 95 // that the compilers don't add any compiler-private data to it. 96 97 public: 98 struct FileMapHeaderBase : public CHeapObj<mtClass> { 99 virtual bool validate() = 0; 100 virtual void populate(FileMapInfo* info, size_t alignment) = 0; 101 }; 102 struct FileMapHeader : FileMapHeaderBase { 103 // Use data() and data_size() to memcopy to/from the FileMapHeader. We need to 104 // avoid read/writing the C++ vtable pointer. 105 static size_t data_size(); 106 char* data() { 107 return ((char*)this) + sizeof(FileMapHeaderBase); 108 } 109 110 int _magic; // identify file type. 111 int _crc; // header crc checksum. 136 size_t _used; // for setting space top on read 137 bool _read_only; // read only space? 138 bool _allow_exec; // executable code in space? 139 } _space[MetaspaceShared::n_regions]; 140 141 // The following fields are all sanity checks for whether this archive 142 // will function correctly with this JVM and the bootclasspath it's 143 // invoked with. 144 char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm 145 146 // The _paths_misc_info is a variable-size structure that records "miscellaneous" 147 // information during dumping. It is generated and validated by the 148 // SharedPathsMiscInfo class. See SharedPathsMiscInfo.hpp and sharedClassUtil.hpp for 149 // detailed description. 150 // 151 // The _paths_misc_info data is stored as a byte array in the archive file header, 152 // immediately after the _header field. This information is used only when 153 // checking the validity of the archive and is deallocated after the archive is loaded. 154 // 155 // Note that the _paths_misc_info does NOT include information for JAR files 156 // that existed during dump time. Their information is stored in _classpath_entry_table. 157 int _paths_misc_info_size; 158 159 // The following is a table of all the class path entries that were used 160 // during dumping. At run time, we require these files to exist and have the same 161 // size/modification time, or else the archive will refuse to load. 162 // 163 // All of these entries must be JAR files. The dumping process would fail if a non-empty 164 // directory was specified in the classpaths. If an empty directory was specified 165 // it is checked by the _paths_misc_info as described above. 166 // 167 // FIXME -- if JAR files in the tail of the list were specified but not used during dumping, 168 // they should be removed from this table, to save space and to avoid spurious 169 // loading failures during runtime. 170 int _classpath_entry_table_size; 171 size_t _classpath_entry_size; 172 Array<u8>* _classpath_entry_table; 173 174 char* region_addr(int idx); 175 176 virtual bool validate(); 177 virtual void populate(FileMapInfo* info, size_t alignment); 178 int compute_crc(); 179 }; 180 181 FileMapHeader * _header; 182 183 const char* _full_path; 184 char* _paths_misc_info; 185 186 static FileMapInfo* _current_info; 187 188 bool init_from_file(int fd); 189 void align_file_position(); 190 bool validate_header_impl(); 191 static void metaspace_pointers_do(MetaspaceClosure* it); 192 253 void unmap_region(int i); 254 bool verify_region_checksum(int i); 255 void close(); 256 bool is_open() { return _file_open; } 257 ReservedSpace reserve_shared_memory(); 258 259 // JVM/TI RedefineClasses() support: 260 // Remap the shared readonly space to shared readwrite, private. 261 bool remap_shared_readonly_as_readwrite(); 262 263 // Errors. 264 static void fail_stop(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2); 265 static void fail_continue(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2); 266 267 bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false); 268 void print_shared_spaces() NOT_CDS_RETURN; 269 270 // Stop CDS sharing and unmap CDS regions. 271 static void stop_sharing_and_unmap(const char* msg); 272 273 static void allocate_classpath_entry_table(); 274 bool validate_classpath_entry_table(); 275 276 static SharedClassPathEntry* shared_classpath(int index) { 277 if (index < 0) { 278 return NULL; 279 } 280 assert(index < _classpath_entry_table_size, "sanity"); 281 char* p = (char*)_classpath_entry_table->data(); 282 p += _classpath_entry_size * index; 283 return (SharedClassPathEntry*)p; 284 } 285 static const char* shared_classpath_name(int index) { 286 assert(index >= 0, "Sanity"); 287 return shared_classpath(index)->name(); 288 } 289 290 static int get_number_of_share_classpaths() { 291 return _classpath_entry_table_size; 292 } 293 294 private: 295 bool map_heap_data(MemRegion **heap_mem, int first, int max, int* num, 296 bool is_open = false) NOT_CDS_JAVA_HEAP_RETURN_(false); 297 bool verify_mapped_heap_regions(int first, int num) NOT_CDS_JAVA_HEAP_RETURN_(false); 298 void dealloc_archive_heap_regions(MemRegion* regions, int num) NOT_CDS_JAVA_HEAP_RETURN; 299 }; 300 301 #endif // SHARE_VM_MEMORY_FILEMAP_HPP | 36 // [magic # = 0xF00BABA2] 37 // ... padding to align on page-boundary 38 // read-write space 39 // read-only space 40 // misc data (block offset table, string table, symbols, dictionary, etc.) 41 // tag(666) 42 43 static const int JVM_IDENT_MAX = 256; 44 45 class SharedClassPathEntry { 46 protected: 47 bool _is_dir; 48 time_t _timestamp; // jar/jimage timestamp, 0 if is directory or other 49 long _filesize; // jar/jimage file size, -1 if is directory, -2 if other 50 Array<char>* _name; 51 Array<u1>* _manifest; 52 53 public: 54 void init(const char* name, TRAPS); 55 void metaspace_pointers_do(MetaspaceClosure* it); 56 bool validate(bool is_class_path = true); 57 58 // The _timestamp only gets set for jar files and "modules" jimage. 59 bool is_jar_or_bootimage() { 60 return _timestamp != 0; 61 } 62 bool is_dir() { return _is_dir; } 63 bool is_modules_image() { return ClassLoader::is_modules_image(name()); } 64 time_t timestamp() const { return _timestamp; } 65 long filesize() const { return _filesize; } 66 const char* name() const { return _name->data(); } 67 const char* manifest() const { 68 return (_manifest == NULL) ? NULL : (const char*)_manifest->data(); 69 } 70 int manifest_size() const { 71 return (_manifest == NULL) ? 0 : _manifest->length(); 72 } 73 }; 74 75 class FileMapInfo : public CHeapObj<mtInternal> { 76 private: 77 friend class ManifestStream; 78 enum { 79 _invalid_version = -1, 80 _current_version = 3 81 }; 82 83 bool _file_open; 84 int _fd; 85 size_t _file_offset; 86 87 private: 88 static Array<u8>* _shared_path_table; 89 static int _shared_path_table_size; 90 static size_t _shared_path_entry_size; 91 static bool _validating_shared_path_table; 92 93 // FileMapHeader describes the shared space data in the file to be 94 // mapped. This structure gets written to a file. It is not a class, so 95 // that the compilers don't add any compiler-private data to it. 96 97 public: 98 struct FileMapHeaderBase : public CHeapObj<mtClass> { 99 virtual bool validate() = 0; 100 virtual void populate(FileMapInfo* info, size_t alignment) = 0; 101 }; 102 struct FileMapHeader : FileMapHeaderBase { 103 // Use data() and data_size() to memcopy to/from the FileMapHeader. We need to 104 // avoid read/writing the C++ vtable pointer. 105 static size_t data_size(); 106 char* data() { 107 return ((char*)this) + sizeof(FileMapHeaderBase); 108 } 109 110 int _magic; // identify file type. 111 int _crc; // header crc checksum. 136 size_t _used; // for setting space top on read 137 bool _read_only; // read only space? 138 bool _allow_exec; // executable code in space? 139 } _space[MetaspaceShared::n_regions]; 140 141 // The following fields are all sanity checks for whether this archive 142 // will function correctly with this JVM and the bootclasspath it's 143 // invoked with. 144 char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm 145 146 // The _paths_misc_info is a variable-size structure that records "miscellaneous" 147 // information during dumping. It is generated and validated by the 148 // SharedPathsMiscInfo class. See SharedPathsMiscInfo.hpp and sharedClassUtil.hpp for 149 // detailed description. 150 // 151 // The _paths_misc_info data is stored as a byte array in the archive file header, 152 // immediately after the _header field. This information is used only when 153 // checking the validity of the archive and is deallocated after the archive is loaded. 154 // 155 // Note that the _paths_misc_info does NOT include information for JAR files 156 // that existed during dump time. Their information is stored in _shared_path_table. 157 int _paths_misc_info_size; 158 159 // The following is a table of all the class path entries that were used 160 // during dumping. At run time, we require these files to exist and have the same 161 // size/modification time, or else the archive will refuse to load. 162 // 163 // All of these entries must be JAR files. The dumping process would fail if a non-empty 164 // directory was specified in the classpaths. If an empty directory was specified 165 // it is checked by the _paths_misc_info as described above. 166 // 167 // FIXME -- if JAR files in the tail of the list were specified but not used during dumping, 168 // they should be removed from this table, to save space and to avoid spurious 169 // loading failures during runtime. 170 int _shared_path_table_size; 171 size_t _shared_path_entry_size; 172 Array<u8>* _shared_path_table; 173 174 char* region_addr(int idx); 175 176 virtual bool validate(); 177 virtual void populate(FileMapInfo* info, size_t alignment); 178 int compute_crc(); 179 }; 180 181 FileMapHeader * _header; 182 183 const char* _full_path; 184 char* _paths_misc_info; 185 186 static FileMapInfo* _current_info; 187 188 bool init_from_file(int fd); 189 void align_file_position(); 190 bool validate_header_impl(); 191 static void metaspace_pointers_do(MetaspaceClosure* it); 192 253 void unmap_region(int i); 254 bool verify_region_checksum(int i); 255 void close(); 256 bool is_open() { return _file_open; } 257 ReservedSpace reserve_shared_memory(); 258 259 // JVM/TI RedefineClasses() support: 260 // Remap the shared readonly space to shared readwrite, private. 261 bool remap_shared_readonly_as_readwrite(); 262 263 // Errors. 264 static void fail_stop(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2); 265 static void fail_continue(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2); 266 267 bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false); 268 void print_shared_spaces() NOT_CDS_RETURN; 269 270 // Stop CDS sharing and unmap CDS regions. 271 static void stop_sharing_and_unmap(const char* msg); 272 273 static void allocate_shared_path_table(); 274 bool validate_shared_path_table(); 275 276 static SharedClassPathEntry* shared_path(int index) { 277 if (index < 0) { 278 return NULL; 279 } 280 assert(index < _shared_path_table_size, "sanity"); 281 char* p = (char*)_shared_path_table->data(); 282 p += _shared_path_entry_size * index; 283 return (SharedClassPathEntry*)p; 284 } 285 286 static const char* shared_path_name(int index) { 287 assert(index >= 0, "Sanity"); 288 return shared_path(index)->name(); 289 } 290 291 static int get_number_of_shared_paths() { 292 return _shared_path_table_size; 293 } 294 295 private: 296 bool map_heap_data(MemRegion **heap_mem, int first, int max, int* num, 297 bool is_open = false) NOT_CDS_JAVA_HEAP_RETURN_(false); 298 bool verify_mapped_heap_regions(int first, int num) NOT_CDS_JAVA_HEAP_RETURN_(false); 299 void dealloc_archive_heap_regions(MemRegion* regions, int num) NOT_CDS_JAVA_HEAP_RETURN; 300 }; 301 302 #endif // SHARE_VM_MEMORY_FILEMAP_HPP |