1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/memory/restore.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,196 @@
1.4 +/*
1.5 + * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +# include "incls/_precompiled.incl"
1.29 +# include "incls/_restore.cpp.incl"
1.30 +
1.31 +
1.32 +// Closure for serializing initialization data in from a data area
1.33 +// (oop_array) read from the shared file.
1.34 +
1.35 +class ReadClosure : public SerializeOopClosure {
1.36 +private:
1.37 + oop** _oop_array;
1.38 +
1.39 + inline oop nextOop() {
1.40 + return *(*_oop_array)++;
1.41 + }
1.42 +
1.43 +public:
1.44 + ReadClosure(oop** oop_array) { _oop_array = oop_array; }
1.45 +
1.46 + void do_oop(oop* p) {
1.47 + assert(SharedSkipVerify || *p == NULL || *p == Universe::klassKlassObj(),
1.48 + "initializing previously initialized oop.");
1.49 + oop obj = nextOop();
1.50 + assert(SharedSkipVerify || (intptr_t)obj >= 0 || (intptr_t)obj < -100,
1.51 + "hit tag while initializing oops.");
1.52 + assert(SharedSkipVerify || obj->is_oop_or_null(), "invalid oop");
1.53 + *p = obj;
1.54 + }
1.55 +
1.56 + void do_ptr(void** p) {
1.57 + assert(*p == NULL, "initializing previous initialized pointer.");
1.58 + void* obj = nextOop();
1.59 + assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
1.60 + "hit tag while initializing ptrs.");
1.61 + *p = obj;
1.62 + }
1.63 +
1.64 + void do_ptr(HeapWord** p) { do_ptr((void **) p); }
1.65 +
1.66 + void do_int(int* p) {
1.67 + *p = (int)(intptr_t)nextOop();
1.68 + }
1.69 +
1.70 + void do_size_t(size_t* p) {
1.71 + // Assumes that size_t and pointers are the same size.
1.72 + *p = (size_t)nextOop();
1.73 + }
1.74 +
1.75 + void do_tag(int tag) {
1.76 + int old_tag;
1.77 + do_int(&old_tag);
1.78 + FileMapInfo::assert_mark(tag == old_tag);
1.79 + }
1.80 +
1.81 + void do_region(u_char* start, size_t size) {
1.82 + assert((intptr_t)start % sizeof(oop) == 0, "bad alignment");
1.83 + assert(size % sizeof(oop) == 0, "bad size");
1.84 + do_tag((int)size);
1.85 + while (size > 0) {
1.86 + *(oop*)start = nextOop();
1.87 + start += sizeof(oop);
1.88 + size -= sizeof(oop);
1.89 + }
1.90 + }
1.91 +
1.92 + bool reading() const { return true; }
1.93 +};
1.94 +
1.95 +
1.96 +// Read the oop and miscellaneous data from the shared file, and
1.97 +// serialize it out to its various destinations.
1.98 +
1.99 +void CompactingPermGenGen::initialize_oops() {
1.100 + FileMapInfo *mapinfo = FileMapInfo::current_info();
1.101 +
1.102 + char* buffer = mapinfo->region_base(md);
1.103 +
1.104 + // Skip over (reserve space for) a list of addresses of C++ vtables
1.105 + // for Klass objects. They get filled in later.
1.106 +
1.107 + // Skip over (reserve space for) dummy C++ vtables Klass objects.
1.108 + // They are used as is.
1.109 +
1.110 + void** vtbl_list = (void**)buffer;
1.111 + buffer += vtbl_list_size * sizeof(void*);
1.112 + intptr_t vtable_size = *(intptr_t*)buffer;
1.113 + buffer += sizeof(intptr_t);
1.114 + buffer += vtable_size;
1.115 +
1.116 + // Create the symbol table using the bucket array at this spot in the
1.117 + // misc data space. Since the symbol table is often modified, this
1.118 + // region (of mapped pages) will be copy-on-write.
1.119 +
1.120 + int symbolTableLen = *(intptr_t*)buffer;
1.121 + buffer += sizeof(intptr_t);
1.122 + int number_of_entries = *(intptr_t*)buffer;
1.123 + buffer += sizeof(intptr_t);
1.124 + SymbolTable::create_table((HashtableBucket*)buffer, symbolTableLen,
1.125 + number_of_entries);
1.126 + buffer += symbolTableLen;
1.127 +
1.128 + // Create the string table using the bucket array at this spot in the
1.129 + // misc data space. Since the string table is often modified, this
1.130 + // region (of mapped pages) will be copy-on-write.
1.131 +
1.132 + int stringTableLen = *(intptr_t*)buffer;
1.133 + buffer += sizeof(intptr_t);
1.134 + number_of_entries = *(intptr_t*)buffer;
1.135 + buffer += sizeof(intptr_t);
1.136 + StringTable::create_table((HashtableBucket*)buffer, stringTableLen,
1.137 + number_of_entries);
1.138 + buffer += stringTableLen;
1.139 +
1.140 + // Create the shared dictionary using the bucket array at this spot in
1.141 + // the misc data space. Since the shared dictionary table is never
1.142 + // modified, this region (of mapped pages) will be (effectively, if
1.143 + // not explicitly) read-only.
1.144 +
1.145 + int sharedDictionaryLen = *(intptr_t*)buffer;
1.146 + buffer += sizeof(intptr_t);
1.147 + number_of_entries = *(intptr_t*)buffer;
1.148 + buffer += sizeof(intptr_t);
1.149 + SystemDictionary::set_shared_dictionary((HashtableBucket*)buffer,
1.150 + sharedDictionaryLen,
1.151 + number_of_entries);
1.152 + buffer += sharedDictionaryLen;
1.153 +
1.154 + // Create the package info table using the bucket array at this spot in
1.155 + // the misc data space. Since the package info table is never
1.156 + // modified, this region (of mapped pages) will be (effectively, if
1.157 + // not explicitly) read-only.
1.158 +
1.159 + int pkgInfoLen = *(intptr_t*)buffer;
1.160 + buffer += sizeof(intptr_t);
1.161 + number_of_entries = *(intptr_t*)buffer;
1.162 + buffer += sizeof(intptr_t);
1.163 + ClassLoader::create_package_info_table((HashtableBucket*)buffer, pkgInfoLen,
1.164 + number_of_entries);
1.165 + buffer += pkgInfoLen;
1.166 + ClassLoader::verify();
1.167 +
1.168 + // The following data in the shared misc data region are the linked
1.169 + // list elements (HashtableEntry objects) for the symbol table, string
1.170 + // table, and shared dictionary. The heap objects refered to by the
1.171 + // symbol table, string table, and shared dictionary are permanent and
1.172 + // unmovable. Since new entries added to the string and symbol tables
1.173 + // are always added at the beginning of the linked lists, THESE LINKED
1.174 + // LIST ELEMENTS ARE READ-ONLY.
1.175 +
1.176 + int len = *(intptr_t*)buffer; // skip over symbol table entries
1.177 + buffer += sizeof(intptr_t);
1.178 + buffer += len;
1.179 +
1.180 + len = *(intptr_t*)buffer; // skip over string table entries
1.181 + buffer += sizeof(intptr_t);
1.182 + buffer += len;
1.183 +
1.184 + len = *(intptr_t*)buffer; // skip over shared dictionary entries
1.185 + buffer += sizeof(intptr_t);
1.186 + buffer += len;
1.187 +
1.188 + len = *(intptr_t*)buffer; // skip over package info table entries
1.189 + buffer += sizeof(intptr_t);
1.190 + buffer += len;
1.191 +
1.192 + len = *(intptr_t*)buffer; // skip over package info table char[] arrays.
1.193 + buffer += sizeof(intptr_t);
1.194 + buffer += len;
1.195 +
1.196 + oop* oop_array = (oop*)buffer;
1.197 + ReadClosure rc(&oop_array);
1.198 + serialize_oops(&rc);
1.199 +}
