1 #ifdef USE_PRAGMA_IDENT_SRC
2 #pragma ident "@(#)restore.cpp 1.14 07/05/05 17:05:44 JVM"
3 #endif
4 /*
5 * Copyright 2003-2008 Sun Microsystems, Inc. All Rights Reserved.
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 *
8 * This code is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 only, as
10 * published by the Free Software Foundation.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
24 * have any questions.
25 *
26 */
27
28 # include "incls/_precompiled.incl"
29 # include "incls/_restore.cpp.incl"
30
31
32 // Closure for serializing initialization data in from a data area
33 // (oop_array) read from the shared file.
34
35 class ReadClosure : public SerializeOopClosure {
36 private:
37 oop** _oop_array;
38
39 inline oop nextOop() {
40 return *(*_oop_array)++;
41 }
42
43 public:
44 ReadClosure(oop** oop_array) { _oop_array = oop_array; }
45
46 void do_oop(oop* p) {
47 assert(SharedSkipVerify || *p == NULL || *p == Universe::klassKlassObj(),
48 "initializing previously initialized oop.");
49 oop obj = nextOop();
50 assert(SharedSkipVerify || (intptr_t)obj >= 0 || (intptr_t)obj < -100,
51 "hit tag while initializing oops.");
52 assert(SharedSkipVerify || obj->is_oop_or_null(), "invalid oop");
53 *p = obj;
54 }
55
56 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
57
58 void do_ptr(void** p) {
59 assert(*p == NULL, "initializing previous initialized pointer.");
60 void* obj = nextOop();
61 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
62 "hit tag while initializing ptrs.");
63 *p = obj;
64 }
65
66 void do_ptr(HeapWord** p) { do_ptr((void **) p); }
67
68 void do_int(int* p) {
69 *p = (int)(intptr_t)nextOop();
70 }
71
72 void do_size_t(size_t* p) {
73 // Assumes that size_t and pointers are the same size.
74 *p = (size_t)nextOop();
75 }
76
77 void do_tag(int tag) {
78 int old_tag;
79 do_int(&old_tag);
80 FileMapInfo::assert_mark(tag == old_tag);
81 }
82
83 void do_region(u_char* start, size_t size) {
84 assert((intptr_t)start % sizeof(oop) == 0, "bad alignment");
85 assert(size % sizeof(oop) == 0, "bad size");
86 do_tag((int)size);
87 while (size > 0) {
88 *(oop*)start = nextOop();
89 start += sizeof(oop);
90 size -= sizeof(oop);
91 }
92 }
93
94 bool reading() const { return true; }
95 };
96
97
98 // Read the oop and miscellaneous data from the shared file, and
99 // serialize it out to its various destinations.
100
101 void CompactingPermGenGen::initialize_oops() {
102 FileMapInfo *mapinfo = FileMapInfo::current_info();
103
104 char* buffer = mapinfo->region_base(md);
105
106 // Skip over (reserve space for) a list of addresses of C++ vtables
107 // for Klass objects. They get filled in later.
108
109 // Skip over (reserve space for) dummy C++ vtables Klass objects.
110 // They are used as is.
111
112 void** vtbl_list = (void**)buffer;
113 buffer += vtbl_list_size * sizeof(void*);
114 intptr_t vtable_size = *(intptr_t*)buffer;
115 buffer += sizeof(intptr_t);
116 buffer += vtable_size;
117
118 // Create the symbol table using the bucket array at this spot in the
119 // misc data space. Since the symbol table is often modified, this
120 // region (of mapped pages) will be copy-on-write.
121
122 int symbolTableLen = *(intptr_t*)buffer;
123 buffer += sizeof(intptr_t);
124 int number_of_entries = *(intptr_t*)buffer;
125 buffer += sizeof(intptr_t);
126 SymbolTable::create_table((HashtableBucket*)buffer, symbolTableLen,
127 number_of_entries);
128 buffer += symbolTableLen;
129
130 // Create the string table using the bucket array at this spot in the
131 // misc data space. Since the string table is often modified, this
132 // region (of mapped pages) will be copy-on-write.
133
134 int stringTableLen = *(intptr_t*)buffer;
135 buffer += sizeof(intptr_t);
136 number_of_entries = *(intptr_t*)buffer;
137 buffer += sizeof(intptr_t);
138 StringTable::create_table((HashtableBucket*)buffer, stringTableLen,
139 number_of_entries);
140 buffer += stringTableLen;
141
142 // Create the shared dictionary using the bucket array at this spot in
143 // the misc data space. Since the shared dictionary table is never
144 // modified, this region (of mapped pages) will be (effectively, if
145 // not explicitly) read-only.
146
147 int sharedDictionaryLen = *(intptr_t*)buffer;
148 buffer += sizeof(intptr_t);
149 number_of_entries = *(intptr_t*)buffer;
150 buffer += sizeof(intptr_t);
151 SystemDictionary::set_shared_dictionary((HashtableBucket*)buffer,
152 sharedDictionaryLen,
153 number_of_entries);
154 buffer += sharedDictionaryLen;
155
156 // Create the package info table using the bucket array at this spot in
157 // the misc data space. Since the package info table is never
158 // modified, this region (of mapped pages) will be (effectively, if
159 // not explicitly) read-only.
160
161 int pkgInfoLen = *(intptr_t*)buffer;
162 buffer += sizeof(intptr_t);
163 number_of_entries = *(intptr_t*)buffer;
164 buffer += sizeof(intptr_t);
165 ClassLoader::create_package_info_table((HashtableBucket*)buffer, pkgInfoLen,
166 number_of_entries);
167 buffer += pkgInfoLen;
168 ClassLoader::verify();
169
170 // The following data in the shared misc data region are the linked
171 // list elements (HashtableEntry objects) for the symbol table, string
172 // table, and shared dictionary. The heap objects refered to by the
173 // symbol table, string table, and shared dictionary are permanent and
174 // unmovable. Since new entries added to the string and symbol tables
175 // are always added at the beginning of the linked lists, THESE LINKED
176 // LIST ELEMENTS ARE READ-ONLY.
177
178 int len = *(intptr_t*)buffer; // skip over symbol table entries
179 buffer += sizeof(intptr_t);
180 buffer += len;
181
182 len = *(intptr_t*)buffer; // skip over string table entries
183 buffer += sizeof(intptr_t);
184 buffer += len;
185
186 len = *(intptr_t*)buffer; // skip over shared dictionary entries
187 buffer += sizeof(intptr_t);
188 buffer += len;
189
190 len = *(intptr_t*)buffer; // skip over package info table entries
191 buffer += sizeof(intptr_t);
192 buffer += len;
193
194 len = *(intptr_t*)buffer; // skip over package info table char[] arrays.
195 buffer += sizeof(intptr_t);
196 buffer += len;
197
198 oop* oop_array = (oop*)buffer;
199 ReadClosure rc(&oop_array);
200 serialize_oops(&rc);
201 }