Mercurial > hg > truffle
comparison src/share/vm/memory/metaspaceShared.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | |
children | fb19af007ffc |
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1 /* | |
2 * Copyright (c) 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 #ifndef SHARE_VM_MEMORY_METASPACE_SHARED_HPP | |
25 #define SHARE_VM_MEMORY_METASPACE_SHARED_HPP | |
26 | |
27 #include "memory/allocation.hpp" | |
28 #include "memory/memRegion.hpp" | |
29 #include "runtime/virtualspace.hpp" | |
30 #include "utilities/exceptions.hpp" | |
31 #include "utilities/macros.hpp" | |
32 | |
33 class FileMapInfo; | |
34 | |
35 // Class Data Sharing Support | |
36 class MetaspaceShared : AllStatic { | |
37 | |
38 // CDS support | |
39 static ReservedSpace* _shared_rs; | |
40 static int _max_alignment; | |
41 | |
42 public: | |
43 enum { | |
44 vtbl_list_size = 17, // number of entries in the shared space vtable list. | |
45 num_virtuals = 200 // maximum number of virtual functions | |
46 // If virtual functions are added to Metadata, | |
47 // this number needs to be increased. Also, | |
48 // SharedMiscCodeSize will need to be increased. | |
49 }; | |
50 | |
51 enum { | |
52 ro = 0, // read-only shared space in the heap | |
53 rw = 1, // read-write shared space in the heap | |
54 md = 2, // miscellaneous data for initializing tables, etc. | |
55 mc = 3, // miscellaneous code - vtable replacement. | |
56 n_regions = 4 | |
57 }; | |
58 | |
59 static void set_max_alignment(int alignment) KERNEL_RETURN; | |
60 static int max_alignment() KERNEL_RETURN_(0); | |
61 | |
62 static void preload_and_dump(TRAPS) KERNEL_RETURN; | |
63 static ReservedSpace* shared_rs(); | |
64 static void set_shared_rs(ReservedSpace* rs) KERNEL_RETURN; | |
65 | |
66 static bool map_shared_spaces(FileMapInfo* mapinfo) KERNEL_RETURN_(false); | |
67 static void initialize_shared_spaces() KERNEL_RETURN; | |
68 | |
69 // Return true if given address is in the mapped shared space. | |
70 static bool is_in_shared_space(const void* p) KERNEL_RETURN_(false); | |
71 | |
72 static void generate_vtable_methods(void** vtbl_list, | |
73 void** vtable, | |
74 char** md_top, char* md_end, | |
75 char** mc_top, char* mc_end); | |
76 static void serialize(SerializeClosure* sc); | |
77 | |
78 // JVM/TI RedefineClasses() support: | |
79 // Remap the shared readonly space to shared readwrite, private if | |
80 // sharing is enabled. Simply returns true if sharing is not enabled | |
81 // or if the remapping has already been done by a prior call. | |
82 static bool remap_shared_readonly_as_readwrite() KERNEL_RETURN_(true); | |
83 | |
84 static void print_shared_spaces(); | |
85 }; | |
86 #endif // SHARE_VM_MEMORY_METASPACE_SHARED_HPP |