Mercurial > hg > truffle
annotate src/share/vm/memory/filemap.hpp @ 20730:8210e5f2e21b
8044269: Analysis of archive files.
Summary: Add checksum verification.
Reviewed-by: iklam, dholmes, mschoene
| author | jiangli |
|---|---|
| date | Tue, 12 Aug 2014 17:46:16 -0400 |
| parents | 85c1ca43713f |
| children | 8cb56c8cb30d |
| rev | line source |
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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_SHARED_JARS_MAX = 128; | |
| 41 static const int JVM_SPACENAME_MAX = 128; | |
| 42 static const int JVM_IDENT_MAX = 256; | |
| 43 static const int JVM_ARCH_MAX = 12; | |
| 44 | |
| 45 | |
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46 class Metaspace; |
| 0 | 47 |
| 6197 | 48 class FileMapInfo : public CHeapObj<mtInternal> { |
| 0 | 49 private: |
| 50 enum { | |
| 51 _invalid_version = -1, | |
| 52 _current_version = 1 | |
| 53 }; | |
| 54 | |
| 55 bool _file_open; | |
| 56 int _fd; | |
| 20730 | 57 size_t _file_offset; |
| 0 | 58 |
| 59 // FileMapHeader describes the shared space data in the file to be | |
| 60 // mapped. This structure gets written to a file. It is not a class, so | |
| 61 // that the compilers don't add any compiler-private data to it. | |
| 62 | |
| 63 struct FileMapHeader { | |
| 64 int _magic; // identify file type. | |
| 20730 | 65 int _crc; // header crc checksum. |
| 0 | 66 int _version; // (from enum, above.) |
| 67 size_t _alignment; // how shared archive should be aligned | |
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68 int _obj_alignment; // value of ObjectAlignmentInBytes |
| 0 | 69 |
| 70 struct space_info { | |
| 20730 | 71 int _crc; // crc checksum of the current space |
| 72 size_t _file_offset; // sizeof(this) rounded to vm page size | |
| 0 | 73 char* _base; // copy-on-write base address |
| 74 size_t _capacity; // for validity checking | |
| 75 size_t _used; // for setting space top on read | |
| 76 bool _read_only; // read only space? | |
| 77 bool _allow_exec; // executable code in space? | |
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78 } _space[MetaspaceShared::n_regions]; |
| 0 | 79 |
| 80 // The following fields are all sanity checks for whether this archive | |
| 81 // will function correctly with this JVM and the bootclasspath it's | |
| 82 // invoked with. | |
| 83 char _arch[JVM_ARCH_MAX]; // architecture | |
| 84 char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm | |
| 85 int _num_jars; // Number of jars in bootclasspath | |
| 86 | |
| 87 // Per jar file data: timestamp, size. | |
| 88 | |
| 89 struct { | |
| 90 time_t _timestamp; // jar timestamp. | |
| 91 long _filesize; // jar file size. | |
| 92 } _jar[JVM_SHARED_JARS_MAX]; | |
| 93 } _header; | |
| 94 const char* _full_path; | |
| 95 | |
| 96 static FileMapInfo* _current_info; | |
| 97 | |
| 98 bool init_from_file(int fd); | |
| 99 void align_file_position(); | |
| 100 | |
| 101 public: | |
| 102 FileMapInfo() { | |
| 103 _file_offset = 0; | |
| 104 _file_open = false; | |
| 105 _header._version = _invalid_version; | |
| 106 } | |
| 107 | |
| 108 static int current_version() { return _current_version; } | |
| 20730 | 109 int compute_header_crc(); |
| 110 void set_header_crc(int crc) { _header._crc = crc; } | |
| 0 | 111 void populate_header(size_t alignment); |
| 112 bool validate(); | |
| 113 void invalidate(); | |
| 114 int version() { return _header._version; } | |
| 115 size_t alignment() { return _header._alignment; } | |
| 116 size_t space_capacity(int i) { return _header._space[i]._capacity; } | |
| 117 char* region_base(int i) { return _header._space[i]._base; } | |
| 118 struct FileMapHeader* header() { return &_header; } | |
| 119 | |
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120 static void set_current_info(FileMapInfo* info) { |
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121 CDS_ONLY(_current_info = info;) |
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122 } |
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123 |
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124 static FileMapInfo* current_info() { |
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125 CDS_ONLY(return _current_info;) |
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126 NOT_CDS(return NULL;) |
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127 } |
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128 |
| 0 | 129 static void assert_mark(bool check); |
| 130 | |
| 131 // File manipulation. | |
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132 bool initialize() NOT_CDS_RETURN_(false); |
| 0 | 133 bool open_for_read(); |
| 134 void open_for_write(); | |
| 135 void write_header(); | |
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136 void write_space(int i, Metaspace* space, bool read_only); |
| 0 | 137 void write_region(int region, char* base, size_t size, |
| 138 size_t capacity, bool read_only, bool allow_exec); | |
| 139 void write_bytes(const void* buffer, int count); | |
| 140 void write_bytes_aligned(const void* buffer, int count); | |
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141 char* map_region(int i); |
| 0 | 142 void unmap_region(int i); |
| 20730 | 143 bool verify_region_checksum(int i); |
| 0 | 144 void close(); |
| 145 bool is_open() { return _file_open; } | |
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146 ReservedSpace reserve_shared_memory(); |
| 0 | 147 |
| 148 // JVM/TI RedefineClasses() support: | |
| 149 // Remap the shared readonly space to shared readwrite, private. | |
| 150 bool remap_shared_readonly_as_readwrite(); | |
| 151 | |
| 152 // Errors. | |
| 153 static void fail_stop(const char *msg, ...); | |
| 154 void fail_continue(const char *msg, ...); | |
| 155 | |
| 156 // Return true if given address is in the mapped shared space. | |
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157 bool is_in_shared_space(const void* p) NOT_CDS_RETURN_(false); |
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158 void print_shared_spaces() NOT_CDS_RETURN; |
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159 |
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160 static size_t shared_spaces_size() { |
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161 return align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
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162 SharedMiscDataSize + SharedMiscCodeSize, |
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163 os::vm_allocation_granularity()); |
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164 } |
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165 |
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166 // Stop CDS sharing and unmap CDS regions. |
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167 static void stop_sharing_and_unmap(const char* msg); |
| 0 | 168 }; |
| 1972 | 169 |
| 170 #endif // SHARE_VM_MEMORY_FILEMAP_HPP |