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comparison src/share/vm/memory/restore.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children ba764ed4b6f2
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-1:000000000000 0:a61af66fc99e
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 # include "incls/_precompiled.incl"
26 # include "incls/_restore.cpp.incl"
27
28
29 // Closure for serializing initialization data in from a data area
30 // (oop_array) read from the shared file.
31
32 class ReadClosure : public SerializeOopClosure {
33 private:
34 oop** _oop_array;
35
36 inline oop nextOop() {
37 return *(*_oop_array)++;
38 }
39
40 public:
41 ReadClosure(oop** oop_array) { _oop_array = oop_array; }
42
43 void do_oop(oop* p) {
44 assert(SharedSkipVerify || *p == NULL || *p == Universe::klassKlassObj(),
45 "initializing previously initialized oop.");
46 oop obj = nextOop();
47 assert(SharedSkipVerify || (intptr_t)obj >= 0 || (intptr_t)obj < -100,
48 "hit tag while initializing oops.");
49 assert(SharedSkipVerify || obj->is_oop_or_null(), "invalid oop");
50 *p = obj;
51 }
52
53 void do_ptr(void** p) {
54 assert(*p == NULL, "initializing previous initialized pointer.");
55 void* obj = nextOop();
56 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
57 "hit tag while initializing ptrs.");
58 *p = obj;
59 }
60
61 void do_ptr(HeapWord** p) { do_ptr((void **) p); }
62
63 void do_int(int* p) {
64 *p = (int)(intptr_t)nextOop();
65 }
66
67 void do_size_t(size_t* p) {
68 // Assumes that size_t and pointers are the same size.
69 *p = (size_t)nextOop();
70 }
71
72 void do_tag(int tag) {
73 int old_tag;
74 do_int(&old_tag);
75 FileMapInfo::assert_mark(tag == old_tag);
76 }
77
78 void do_region(u_char* start, size_t size) {
79 assert((intptr_t)start % sizeof(oop) == 0, "bad alignment");
80 assert(size % sizeof(oop) == 0, "bad size");
81 do_tag((int)size);
82 while (size > 0) {
83 *(oop*)start = nextOop();
84 start += sizeof(oop);
85 size -= sizeof(oop);
86 }
87 }
88
89 bool reading() const { return true; }
90 };
91
92
93 // Read the oop and miscellaneous data from the shared file, and
94 // serialize it out to its various destinations.
95
96 void CompactingPermGenGen::initialize_oops() {
97 FileMapInfo *mapinfo = FileMapInfo::current_info();
98
99 char* buffer = mapinfo->region_base(md);
100
101 // Skip over (reserve space for) a list of addresses of C++ vtables
102 // for Klass objects. They get filled in later.
103
104 // Skip over (reserve space for) dummy C++ vtables Klass objects.
105 // They are used as is.
106
107 void** vtbl_list = (void**)buffer;
108 buffer += vtbl_list_size * sizeof(void*);
109 intptr_t vtable_size = *(intptr_t*)buffer;
110 buffer += sizeof(intptr_t);
111 buffer += vtable_size;
112
113 // Create the symbol table using the bucket array at this spot in the
114 // misc data space. Since the symbol table is often modified, this
115 // region (of mapped pages) will be copy-on-write.
116
117 int symbolTableLen = *(intptr_t*)buffer;
118 buffer += sizeof(intptr_t);
119 int number_of_entries = *(intptr_t*)buffer;
120 buffer += sizeof(intptr_t);
121 SymbolTable::create_table((HashtableBucket*)buffer, symbolTableLen,
122 number_of_entries);
123 buffer += symbolTableLen;
124
125 // Create the string table using the bucket array at this spot in the
126 // misc data space. Since the string table is often modified, this
127 // region (of mapped pages) will be copy-on-write.
128
129 int stringTableLen = *(intptr_t*)buffer;
130 buffer += sizeof(intptr_t);
131 number_of_entries = *(intptr_t*)buffer;
132 buffer += sizeof(intptr_t);
133 StringTable::create_table((HashtableBucket*)buffer, stringTableLen,
134 number_of_entries);
135 buffer += stringTableLen;
136
137 // Create the shared dictionary using the bucket array at this spot in
138 // the misc data space. Since the shared dictionary table is never
139 // modified, this region (of mapped pages) will be (effectively, if
140 // not explicitly) read-only.
141
142 int sharedDictionaryLen = *(intptr_t*)buffer;
143 buffer += sizeof(intptr_t);
144 number_of_entries = *(intptr_t*)buffer;
145 buffer += sizeof(intptr_t);
146 SystemDictionary::set_shared_dictionary((HashtableBucket*)buffer,
147 sharedDictionaryLen,
148 number_of_entries);
149 buffer += sharedDictionaryLen;
150
151 // Create the package info table using the bucket array at this spot in
152 // the misc data space. Since the package info table is never
153 // modified, this region (of mapped pages) will be (effectively, if
154 // not explicitly) read-only.
155
156 int pkgInfoLen = *(intptr_t*)buffer;
157 buffer += sizeof(intptr_t);
158 number_of_entries = *(intptr_t*)buffer;
159 buffer += sizeof(intptr_t);
160 ClassLoader::create_package_info_table((HashtableBucket*)buffer, pkgInfoLen,
161 number_of_entries);
162 buffer += pkgInfoLen;
163 ClassLoader::verify();
164
165 // The following data in the shared misc data region are the linked
166 // list elements (HashtableEntry objects) for the symbol table, string
167 // table, and shared dictionary. The heap objects refered to by the
168 // symbol table, string table, and shared dictionary are permanent and
169 // unmovable. Since new entries added to the string and symbol tables
170 // are always added at the beginning of the linked lists, THESE LINKED
171 // LIST ELEMENTS ARE READ-ONLY.
172
173 int len = *(intptr_t*)buffer; // skip over symbol table entries
174 buffer += sizeof(intptr_t);
175 buffer += len;
176
177 len = *(intptr_t*)buffer; // skip over string table entries
178 buffer += sizeof(intptr_t);
179 buffer += len;
180
181 len = *(intptr_t*)buffer; // skip over shared dictionary entries
182 buffer += sizeof(intptr_t);
183 buffer += len;
184
185 len = *(intptr_t*)buffer; // skip over package info table entries
186 buffer += sizeof(intptr_t);
187 buffer += len;
188
189 len = *(intptr_t*)buffer; // skip over package info table char[] arrays.
190 buffer += sizeof(intptr_t);
191 buffer += len;
192
193 oop* oop_array = (oop*)buffer;
194 ReadClosure rc(&oop_array);
195 serialize_oops(&rc);
196 }