Mercurial > hg > truffle
annotate src/share/vm/memory/filemap.hpp @ 6027:8a2e5a6a19a4
7143490: G1: Remove HeapRegion::_top_at_conc_mark_count
Summary: Removed the HeapRegion::_top_at_conc_mark_count field. It is no longer needed as a result of the changes for 6888336 and 7127706. Refactored the closures that finalize and verify the liveness counting data so that common functionality was placed into a base class.
Reviewed-by: brutisso, tonyp
author | johnc |
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date | Wed, 25 Apr 2012 10:23:12 -0700 |
parents | f95d63e2154a |
children | d2a62e0f25eb |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, 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 | |
28 #include "memory/compactingPermGenGen.hpp" | |
29 #include "memory/space.hpp" | |
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 | |
46 | |
47 class FileMapInfo : public CHeapObj { | |
48 private: | |
49 enum { | |
50 _invalid_version = -1, | |
51 _current_version = 1 | |
52 }; | |
53 | |
54 bool _file_open; | |
55 int _fd; | |
56 long _file_offset; | |
57 | |
58 // FileMapHeader describes the shared space data in the file to be | |
59 // mapped. This structure gets written to a file. It is not a class, so | |
60 // that the compilers don't add any compiler-private data to it. | |
61 | |
62 struct FileMapHeader { | |
63 int _magic; // identify file type. | |
64 int _version; // (from enum, above.) | |
65 size_t _alignment; // how shared archive should be aligned | |
66 | |
67 struct space_info { | |
68 int _file_offset; // sizeof(this) rounded to vm page size | |
69 char* _base; // copy-on-write base address | |
70 size_t _capacity; // for validity checking | |
71 size_t _used; // for setting space top on read | |
72 bool _read_only; // read only space? | |
73 bool _allow_exec; // executable code in space? | |
74 } _space[CompactingPermGenGen::n_regions]; | |
75 | |
76 // The following fields are all sanity checks for whether this archive | |
77 // will function correctly with this JVM and the bootclasspath it's | |
78 // invoked with. | |
79 char _arch[JVM_ARCH_MAX]; // architecture | |
80 char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm | |
81 int _num_jars; // Number of jars in bootclasspath | |
82 | |
83 // Per jar file data: timestamp, size. | |
84 | |
85 struct { | |
86 time_t _timestamp; // jar timestamp. | |
87 long _filesize; // jar file size. | |
88 } _jar[JVM_SHARED_JARS_MAX]; | |
89 } _header; | |
90 const char* _full_path; | |
91 | |
92 static FileMapInfo* _current_info; | |
93 | |
94 bool init_from_file(int fd); | |
95 void align_file_position(); | |
96 | |
97 public: | |
98 FileMapInfo() { | |
99 _file_offset = 0; | |
100 _file_open = false; | |
101 _header._version = _invalid_version; | |
102 } | |
103 | |
104 static int current_version() { return _current_version; } | |
105 void populate_header(size_t alignment); | |
106 bool validate(); | |
107 void invalidate(); | |
108 int version() { return _header._version; } | |
109 size_t alignment() { return _header._alignment; } | |
110 size_t space_capacity(int i) { return _header._space[i]._capacity; } | |
111 char* region_base(int i) { return _header._space[i]._base; } | |
112 struct FileMapHeader* header() { return &_header; } | |
113 | |
114 static void set_current_info(FileMapInfo* info) { _current_info = info; } | |
115 static FileMapInfo* current_info() { return _current_info; } | |
116 static void assert_mark(bool check); | |
117 | |
118 // File manipulation. | |
119 bool initialize(); | |
120 bool open_for_read(); | |
121 void open_for_write(); | |
122 void write_header(); | |
123 void write_space(int i, CompactibleSpace* space, bool read_only); | |
124 void write_region(int region, char* base, size_t size, | |
125 size_t capacity, bool read_only, bool allow_exec); | |
126 void write_bytes(const void* buffer, int count); | |
127 void write_bytes_aligned(const void* buffer, int count); | |
128 bool map_space(int i, ReservedSpace rs, ContiguousSpace *space); | |
129 char* map_region(int i, ReservedSpace rs); | |
130 char* map_region(int i, bool address_must_match); | |
131 void unmap_region(int i); | |
132 void close(); | |
133 bool is_open() { return _file_open; } | |
134 | |
135 // JVM/TI RedefineClasses() support: | |
136 // Remap the shared readonly space to shared readwrite, private. | |
137 bool remap_shared_readonly_as_readwrite(); | |
138 | |
139 // Errors. | |
140 static void fail_stop(const char *msg, ...); | |
141 void fail_continue(const char *msg, ...); | |
142 | |
143 // Return true if given address is in the mapped shared space. | |
144 bool is_in_shared_space(const void* p); | |
145 }; | |
1972 | 146 |
147 #endif // SHARE_VM_MEMORY_FILEMAP_HPP |