Mon, 15 Sep 2014 16:39:00 -0400
Merge
duke@435 | 1 | /* |
hseigel@5528 | 2 | * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #ifndef SHARE_VM_MEMORY_FILEMAP_HPP |
stefank@2314 | 26 | #define SHARE_VM_MEMORY_FILEMAP_HPP |
stefank@2314 | 27 | |
coleenp@4037 | 28 | #include "memory/metaspaceShared.hpp" |
stefank@5863 | 29 | #include "memory/metaspace.hpp" |
stefank@2314 | 30 | |
duke@435 | 31 | // Layout of the file: |
duke@435 | 32 | // header: dump of archive instance plus versioning info, datestamp, etc. |
duke@435 | 33 | // [magic # = 0xF00BABA2] |
duke@435 | 34 | // ... padding to align on page-boundary |
duke@435 | 35 | // read-write space from CompactingPermGenGen |
duke@435 | 36 | // read-only space from CompactingPermGenGen |
duke@435 | 37 | // misc data (block offset table, string table, symbols, dictionary, etc.) |
duke@435 | 38 | // tag(666) |
duke@435 | 39 | |
duke@435 | 40 | static const int JVM_IDENT_MAX = 256; |
duke@435 | 41 | |
coleenp@4037 | 42 | class Metaspace; |
duke@435 | 43 | |
iklam@7089 | 44 | class SharedClassPathEntry VALUE_OBJ_CLASS_SPEC { |
iklam@7089 | 45 | public: |
iklam@7089 | 46 | const char *_name; |
iklam@7089 | 47 | time_t _timestamp; // jar timestamp, 0 if is directory |
iklam@7089 | 48 | long _filesize; // jar file size, -1 if is directory |
iklam@7089 | 49 | bool is_dir() { |
iklam@7089 | 50 | return _filesize == -1; |
iklam@7089 | 51 | } |
iklam@7089 | 52 | }; |
iklam@7089 | 53 | |
zgu@3900 | 54 | class FileMapInfo : public CHeapObj<mtInternal> { |
duke@435 | 55 | private: |
iklam@7089 | 56 | friend class ManifestStream; |
duke@435 | 57 | enum { |
duke@435 | 58 | _invalid_version = -1, |
iklam@7089 | 59 | _current_version = 2 |
duke@435 | 60 | }; |
duke@435 | 61 | |
duke@435 | 62 | bool _file_open; |
duke@435 | 63 | int _fd; |
jiangli@6868 | 64 | size_t _file_offset; |
duke@435 | 65 | |
iklam@7089 | 66 | private: |
iklam@7089 | 67 | static SharedClassPathEntry* _classpath_entry_table; |
iklam@7089 | 68 | static int _classpath_entry_table_size; |
iklam@7089 | 69 | static size_t _classpath_entry_size; |
iklam@7089 | 70 | static bool _validating_classpath_entry_table; |
iklam@7089 | 71 | |
duke@435 | 72 | // FileMapHeader describes the shared space data in the file to be |
duke@435 | 73 | // mapped. This structure gets written to a file. It is not a class, so |
duke@435 | 74 | // that the compilers don't add any compiler-private data to it. |
duke@435 | 75 | |
iklam@7089 | 76 | public: |
iklam@7089 | 77 | struct FileMapHeaderBase : public CHeapObj<mtClass> { |
iklam@7089 | 78 | virtual bool validate() = 0; |
iklam@7089 | 79 | virtual void populate(FileMapInfo* info, size_t alignment) = 0; |
iklam@7089 | 80 | }; |
iklam@7089 | 81 | struct FileMapHeader : FileMapHeaderBase { |
iklam@7089 | 82 | // Use data() and data_size() to memcopy to/from the FileMapHeader. We need to |
iklam@7089 | 83 | // avoid read/writing the C++ vtable pointer. |
iklam@7089 | 84 | static size_t data_size(); |
iklam@7089 | 85 | char* data() { |
iklam@7089 | 86 | return ((char*)this) + sizeof(FileMapHeaderBase); |
iklam@7089 | 87 | } |
iklam@7089 | 88 | |
duke@435 | 89 | int _magic; // identify file type. |
jiangli@6868 | 90 | int _crc; // header crc checksum. |
duke@435 | 91 | int _version; // (from enum, above.) |
duke@435 | 92 | size_t _alignment; // how shared archive should be aligned |
hseigel@4397 | 93 | int _obj_alignment; // value of ObjectAlignmentInBytes |
duke@435 | 94 | |
duke@435 | 95 | struct space_info { |
jiangli@6868 | 96 | int _crc; // crc checksum of the current space |
jiangli@6868 | 97 | size_t _file_offset; // sizeof(this) rounded to vm page size |
duke@435 | 98 | char* _base; // copy-on-write base address |
duke@435 | 99 | size_t _capacity; // for validity checking |
duke@435 | 100 | size_t _used; // for setting space top on read |
duke@435 | 101 | bool _read_only; // read only space? |
duke@435 | 102 | bool _allow_exec; // executable code in space? |
coleenp@4037 | 103 | } _space[MetaspaceShared::n_regions]; |
duke@435 | 104 | |
duke@435 | 105 | // The following fields are all sanity checks for whether this archive |
duke@435 | 106 | // will function correctly with this JVM and the bootclasspath it's |
duke@435 | 107 | // invoked with. |
duke@435 | 108 | char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm |
duke@435 | 109 | |
iklam@7089 | 110 | // The _paths_misc_info is a variable-size structure that records "miscellaneous" |
iklam@7089 | 111 | // information during dumping. It is generated and validated by the |
iklam@7089 | 112 | // SharedPathsMiscInfo class. See SharedPathsMiscInfo.hpp and sharedClassUtil.hpp for |
iklam@7089 | 113 | // detailed description. |
iklam@7089 | 114 | // |
iklam@7089 | 115 | // The _paths_misc_info data is stored as a byte array in the archive file header, |
iklam@7089 | 116 | // immediately after the _header field. This information is used only when |
iklam@7089 | 117 | // checking the validity of the archive and is deallocated after the archive is loaded. |
iklam@7089 | 118 | // |
iklam@7089 | 119 | // Note that the _paths_misc_info does NOT include information for JAR files |
iklam@7089 | 120 | // that existed during dump time. Their information is stored in _classpath_entry_table. |
iklam@7089 | 121 | int _paths_misc_info_size; |
duke@435 | 122 | |
iklam@7089 | 123 | // The following is a table of all the class path entries that were used |
iklam@7089 | 124 | // during dumping. At run time, we require these files to exist and have the same |
iklam@7089 | 125 | // size/modification time, or else the archive will refuse to load. |
iklam@7089 | 126 | // |
iklam@7089 | 127 | // All of these entries must be JAR files. The dumping process would fail if a non-empty |
iklam@7089 | 128 | // directory was specified in the classpaths. If an empty directory was specified |
iklam@7089 | 129 | // it is checked by the _paths_misc_info as described above. |
iklam@7089 | 130 | // |
iklam@7089 | 131 | // FIXME -- if JAR files in the tail of the list were specified but not used during dumping, |
iklam@7089 | 132 | // they should be removed from this table, to save space and to avoid spurious |
iklam@7089 | 133 | // loading failures during runtime. |
iklam@7089 | 134 | int _classpath_entry_table_size; |
iklam@7089 | 135 | size_t _classpath_entry_size; |
iklam@7089 | 136 | SharedClassPathEntry* _classpath_entry_table; |
iklam@7089 | 137 | |
iklam@7089 | 138 | virtual bool validate(); |
iklam@7089 | 139 | virtual void populate(FileMapInfo* info, size_t alignment); |
jiangli@7241 | 140 | int compute_crc(); |
iklam@7089 | 141 | }; |
iklam@7089 | 142 | |
iklam@7089 | 143 | FileMapHeader * _header; |
iklam@7089 | 144 | |
duke@435 | 145 | const char* _full_path; |
iklam@7089 | 146 | char* _paths_misc_info; |
duke@435 | 147 | |
duke@435 | 148 | static FileMapInfo* _current_info; |
duke@435 | 149 | |
duke@435 | 150 | bool init_from_file(int fd); |
duke@435 | 151 | void align_file_position(); |
iklam@7089 | 152 | bool validate_header_impl(); |
duke@435 | 153 | |
duke@435 | 154 | public: |
iklam@7089 | 155 | FileMapInfo(); |
iklam@7089 | 156 | ~FileMapInfo(); |
duke@435 | 157 | |
duke@435 | 158 | static int current_version() { return _current_version; } |
jiangli@6868 | 159 | int compute_header_crc(); |
jiangli@7241 | 160 | void set_header_crc(int crc) { _header->_crc = crc; } |
duke@435 | 161 | void populate_header(size_t alignment); |
iklam@7089 | 162 | bool validate_header(); |
duke@435 | 163 | void invalidate(); |
iklam@7089 | 164 | int version() { return _header->_version; } |
iklam@7089 | 165 | size_t alignment() { return _header->_alignment; } |
iklam@7089 | 166 | size_t space_capacity(int i) { return _header->_space[i]._capacity; } |
iklam@7089 | 167 | char* region_base(int i) { return _header->_space[i]._base; } |
iklam@7089 | 168 | struct FileMapHeader* header() { return _header; } |
jprovino@4720 | 169 | |
jprovino@4720 | 170 | static FileMapInfo* current_info() { |
jprovino@4720 | 171 | CDS_ONLY(return _current_info;) |
jprovino@4720 | 172 | NOT_CDS(return NULL;) |
jprovino@4720 | 173 | } |
jprovino@4720 | 174 | |
duke@435 | 175 | static void assert_mark(bool check); |
duke@435 | 176 | |
duke@435 | 177 | // File manipulation. |
jprovino@4720 | 178 | bool initialize() NOT_CDS_RETURN_(false); |
duke@435 | 179 | bool open_for_read(); |
duke@435 | 180 | void open_for_write(); |
duke@435 | 181 | void write_header(); |
coleenp@4037 | 182 | void write_space(int i, Metaspace* space, bool read_only); |
duke@435 | 183 | void write_region(int region, char* base, size_t size, |
duke@435 | 184 | size_t capacity, bool read_only, bool allow_exec); |
duke@435 | 185 | void write_bytes(const void* buffer, int count); |
duke@435 | 186 | void write_bytes_aligned(const void* buffer, int count); |
coleenp@4037 | 187 | char* map_region(int i); |
duke@435 | 188 | void unmap_region(int i); |
jiangli@6868 | 189 | bool verify_region_checksum(int i); |
duke@435 | 190 | void close(); |
duke@435 | 191 | bool is_open() { return _file_open; } |
coleenp@4037 | 192 | ReservedSpace reserve_shared_memory(); |
duke@435 | 193 | |
duke@435 | 194 | // JVM/TI RedefineClasses() support: |
duke@435 | 195 | // Remap the shared readonly space to shared readwrite, private. |
duke@435 | 196 | bool remap_shared_readonly_as_readwrite(); |
duke@435 | 197 | |
duke@435 | 198 | // Errors. |
duke@435 | 199 | static void fail_stop(const char *msg, ...); |
iklam@7089 | 200 | static void fail_continue(const char *msg, ...); |
duke@435 | 201 | |
duke@435 | 202 | // Return true if given address is in the mapped shared space. |
jprovino@4720 | 203 | bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); |
iklam@5329 | 204 | void print_shared_spaces() NOT_CDS_RETURN; |
hseigel@5528 | 205 | |
hseigel@5528 | 206 | static size_t shared_spaces_size() { |
hseigel@5528 | 207 | return align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
hseigel@5528 | 208 | SharedMiscDataSize + SharedMiscCodeSize, |
hseigel@5528 | 209 | os::vm_allocation_granularity()); |
hseigel@5528 | 210 | } |
hseigel@5528 | 211 | |
hseigel@5528 | 212 | // Stop CDS sharing and unmap CDS regions. |
hseigel@5528 | 213 | static void stop_sharing_and_unmap(const char* msg); |
iklam@7089 | 214 | |
iklam@7089 | 215 | static void allocate_classpath_entry_table(); |
iklam@7089 | 216 | bool validate_classpath_entry_table(); |
iklam@7089 | 217 | |
iklam@7089 | 218 | static SharedClassPathEntry* shared_classpath(int index) { |
iklam@7089 | 219 | char* p = (char*)_classpath_entry_table; |
iklam@7089 | 220 | p += _classpath_entry_size * index; |
iklam@7089 | 221 | return (SharedClassPathEntry*)p; |
iklam@7089 | 222 | } |
iklam@7089 | 223 | static const char* shared_classpath_name(int index) { |
iklam@7089 | 224 | return shared_classpath(index)->_name; |
iklam@7089 | 225 | } |
iklam@7089 | 226 | |
iklam@7089 | 227 | static int get_number_of_share_classpaths() { |
iklam@7089 | 228 | return _classpath_entry_table_size; |
iklam@7089 | 229 | } |
duke@435 | 230 | }; |
stefank@2314 | 231 | |
stefank@2314 | 232 | #endif // SHARE_VM_MEMORY_FILEMAP_HPP |