Mercurial > hg > graal-compiler
annotate src/share/vm/memory/filemap.hpp @ 1722:effb55808a18
Merge
author | johnc |
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date | Wed, 18 Aug 2010 17:44:33 -0400 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2006, 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 |
c18cbe5936b8
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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 | |
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 }; |