|
1 /* |
|
2 * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. |
|
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 * |
|
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
|
20 * CA 95054 USA or visit www.sun.com if you need additional information or |
|
21 * have any questions. |
|
22 * |
|
23 */ |
|
24 |
|
25 // Layout of the file: |
|
26 // header: dump of archive instance plus versioning info, datestamp, etc. |
|
27 // [magic # = 0xF00BABA2] |
|
28 // ... padding to align on page-boundary |
|
29 // read-write space from CompactingPermGenGen |
|
30 // read-only space from CompactingPermGenGen |
|
31 // misc data (block offset table, string table, symbols, dictionary, etc.) |
|
32 // tag(666) |
|
33 |
|
34 static const int JVM_SHARED_JARS_MAX = 128; |
|
35 static const int JVM_SPACENAME_MAX = 128; |
|
36 static const int JVM_IDENT_MAX = 256; |
|
37 static const int JVM_ARCH_MAX = 12; |
|
38 |
|
39 |
|
40 |
|
41 class FileMapInfo : public CHeapObj { |
|
42 private: |
|
43 enum { |
|
44 _invalid_version = -1, |
|
45 _current_version = 1 |
|
46 }; |
|
47 |
|
48 bool _file_open; |
|
49 int _fd; |
|
50 long _file_offset; |
|
51 |
|
52 // FileMapHeader describes the shared space data in the file to be |
|
53 // mapped. This structure gets written to a file. It is not a class, so |
|
54 // that the compilers don't add any compiler-private data to it. |
|
55 |
|
56 struct FileMapHeader { |
|
57 int _magic; // identify file type. |
|
58 int _version; // (from enum, above.) |
|
59 size_t _alignment; // how shared archive should be aligned |
|
60 |
|
61 struct space_info { |
|
62 int _file_offset; // sizeof(this) rounded to vm page size |
|
63 char* _base; // copy-on-write base address |
|
64 size_t _capacity; // for validity checking |
|
65 size_t _used; // for setting space top on read |
|
66 bool _read_only; // read only space? |
|
67 bool _allow_exec; // executable code in space? |
|
68 } _space[CompactingPermGenGen::n_regions]; |
|
69 |
|
70 // The following fields are all sanity checks for whether this archive |
|
71 // will function correctly with this JVM and the bootclasspath it's |
|
72 // invoked with. |
|
73 char _arch[JVM_ARCH_MAX]; // architecture |
|
74 char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm |
|
75 int _num_jars; // Number of jars in bootclasspath |
|
76 |
|
77 // Per jar file data: timestamp, size. |
|
78 |
|
79 struct { |
|
80 time_t _timestamp; // jar timestamp. |
|
81 long _filesize; // jar file size. |
|
82 } _jar[JVM_SHARED_JARS_MAX]; |
|
83 } _header; |
|
84 const char* _full_path; |
|
85 |
|
86 static FileMapInfo* _current_info; |
|
87 |
|
88 bool init_from_file(int fd); |
|
89 void align_file_position(); |
|
90 |
|
91 public: |
|
92 FileMapInfo() { |
|
93 _file_offset = 0; |
|
94 _file_open = false; |
|
95 _header._version = _invalid_version; |
|
96 } |
|
97 |
|
98 static int current_version() { return _current_version; } |
|
99 void populate_header(size_t alignment); |
|
100 bool validate(); |
|
101 void invalidate(); |
|
102 int version() { return _header._version; } |
|
103 size_t alignment() { return _header._alignment; } |
|
104 size_t space_capacity(int i) { return _header._space[i]._capacity; } |
|
105 char* region_base(int i) { return _header._space[i]._base; } |
|
106 struct FileMapHeader* header() { return &_header; } |
|
107 |
|
108 static void set_current_info(FileMapInfo* info) { _current_info = info; } |
|
109 static FileMapInfo* current_info() { return _current_info; } |
|
110 static void assert_mark(bool check); |
|
111 |
|
112 // File manipulation. |
|
113 bool initialize(); |
|
114 bool open_for_read(); |
|
115 void open_for_write(); |
|
116 void write_header(); |
|
117 void write_space(int i, CompactibleSpace* space, bool read_only); |
|
118 void write_region(int region, char* base, size_t size, |
|
119 size_t capacity, bool read_only, bool allow_exec); |
|
120 void write_bytes(const void* buffer, int count); |
|
121 void write_bytes_aligned(const void* buffer, int count); |
|
122 bool map_space(int i, ReservedSpace rs, ContiguousSpace *space); |
|
123 char* map_region(int i, ReservedSpace rs); |
|
124 char* map_region(int i, bool address_must_match); |
|
125 void unmap_region(int i); |
|
126 void close(); |
|
127 bool is_open() { return _file_open; } |
|
128 |
|
129 // JVM/TI RedefineClasses() support: |
|
130 // Remap the shared readonly space to shared readwrite, private. |
|
131 bool remap_shared_readonly_as_readwrite(); |
|
132 |
|
133 // Errors. |
|
134 static void fail_stop(const char *msg, ...); |
|
135 void fail_continue(const char *msg, ...); |
|
136 |
|
137 // Return true if given address is in the mapped shared space. |
|
138 bool is_in_shared_space(const void* p); |
|
139 }; |