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1 /*
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2 * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_restore.cpp.incl"
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27
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28
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29 // Closure for serializing initialization data in from a data area
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30 // (oop_array) read from the shared file.
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31
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32 class ReadClosure : public SerializeOopClosure {
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33 private:
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34 oop** _oop_array;
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35
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36 inline oop nextOop() {
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37 return *(*_oop_array)++;
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38 }
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39
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40 public:
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41 ReadClosure(oop** oop_array) { _oop_array = oop_array; }
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42
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43 void do_oop(oop* p) {
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44 assert(SharedSkipVerify || *p == NULL || *p == Universe::klassKlassObj(),
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45 "initializing previously initialized oop.");
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46 oop obj = nextOop();
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47 assert(SharedSkipVerify || (intptr_t)obj >= 0 || (intptr_t)obj < -100,
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48 "hit tag while initializing oops.");
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49 assert(SharedSkipVerify || obj->is_oop_or_null(), "invalid oop");
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50 *p = obj;
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51 }
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52
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53 void do_ptr(void** p) {
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54 assert(*p == NULL, "initializing previous initialized pointer.");
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55 void* obj = nextOop();
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56 assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
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57 "hit tag while initializing ptrs.");
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58 *p = obj;
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59 }
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60
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61 void do_ptr(HeapWord** p) { do_ptr((void **) p); }
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62
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63 void do_int(int* p) {
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64 *p = (int)(intptr_t)nextOop();
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65 }
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66
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67 void do_size_t(size_t* p) {
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68 // Assumes that size_t and pointers are the same size.
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69 *p = (size_t)nextOop();
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70 }
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71
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72 void do_tag(int tag) {
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73 int old_tag;
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74 do_int(&old_tag);
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75 FileMapInfo::assert_mark(tag == old_tag);
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76 }
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77
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78 void do_region(u_char* start, size_t size) {
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79 assert((intptr_t)start % sizeof(oop) == 0, "bad alignment");
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80 assert(size % sizeof(oop) == 0, "bad size");
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81 do_tag((int)size);
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82 while (size > 0) {
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83 *(oop*)start = nextOop();
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84 start += sizeof(oop);
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85 size -= sizeof(oop);
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86 }
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87 }
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88
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89 bool reading() const { return true; }
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90 };
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91
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92
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93 // Read the oop and miscellaneous data from the shared file, and
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94 // serialize it out to its various destinations.
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95
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96 void CompactingPermGenGen::initialize_oops() {
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97 FileMapInfo *mapinfo = FileMapInfo::current_info();
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98
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99 char* buffer = mapinfo->region_base(md);
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100
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101 // Skip over (reserve space for) a list of addresses of C++ vtables
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102 // for Klass objects. They get filled in later.
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103
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104 // Skip over (reserve space for) dummy C++ vtables Klass objects.
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105 // They are used as is.
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106
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107 void** vtbl_list = (void**)buffer;
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108 buffer += vtbl_list_size * sizeof(void*);
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109 intptr_t vtable_size = *(intptr_t*)buffer;
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110 buffer += sizeof(intptr_t);
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111 buffer += vtable_size;
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112
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113 // Create the symbol table using the bucket array at this spot in the
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114 // misc data space. Since the symbol table is often modified, this
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115 // region (of mapped pages) will be copy-on-write.
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116
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117 int symbolTableLen = *(intptr_t*)buffer;
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118 buffer += sizeof(intptr_t);
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119 int number_of_entries = *(intptr_t*)buffer;
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120 buffer += sizeof(intptr_t);
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121 SymbolTable::create_table((HashtableBucket*)buffer, symbolTableLen,
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122 number_of_entries);
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123 buffer += symbolTableLen;
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124
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125 // Create the string table using the bucket array at this spot in the
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126 // misc data space. Since the string table is often modified, this
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127 // region (of mapped pages) will be copy-on-write.
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128
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129 int stringTableLen = *(intptr_t*)buffer;
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130 buffer += sizeof(intptr_t);
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131 number_of_entries = *(intptr_t*)buffer;
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132 buffer += sizeof(intptr_t);
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133 StringTable::create_table((HashtableBucket*)buffer, stringTableLen,
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134 number_of_entries);
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135 buffer += stringTableLen;
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136
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137 // Create the shared dictionary using the bucket array at this spot in
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138 // the misc data space. Since the shared dictionary table is never
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139 // modified, this region (of mapped pages) will be (effectively, if
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140 // not explicitly) read-only.
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141
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142 int sharedDictionaryLen = *(intptr_t*)buffer;
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143 buffer += sizeof(intptr_t);
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144 number_of_entries = *(intptr_t*)buffer;
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145 buffer += sizeof(intptr_t);
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146 SystemDictionary::set_shared_dictionary((HashtableBucket*)buffer,
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147 sharedDictionaryLen,
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148 number_of_entries);
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149 buffer += sharedDictionaryLen;
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150
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151 // Create the package info table using the bucket array at this spot in
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152 // the misc data space. Since the package info table is never
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153 // modified, this region (of mapped pages) will be (effectively, if
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154 // not explicitly) read-only.
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155
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156 int pkgInfoLen = *(intptr_t*)buffer;
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157 buffer += sizeof(intptr_t);
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158 number_of_entries = *(intptr_t*)buffer;
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159 buffer += sizeof(intptr_t);
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160 ClassLoader::create_package_info_table((HashtableBucket*)buffer, pkgInfoLen,
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161 number_of_entries);
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162 buffer += pkgInfoLen;
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163 ClassLoader::verify();
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164
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165 // The following data in the shared misc data region are the linked
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166 // list elements (HashtableEntry objects) for the symbol table, string
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167 // table, and shared dictionary. The heap objects refered to by the
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168 // symbol table, string table, and shared dictionary are permanent and
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169 // unmovable. Since new entries added to the string and symbol tables
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170 // are always added at the beginning of the linked lists, THESE LINKED
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171 // LIST ELEMENTS ARE READ-ONLY.
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172
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173 int len = *(intptr_t*)buffer; // skip over symbol table entries
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174 buffer += sizeof(intptr_t);
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175 buffer += len;
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176
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177 len = *(intptr_t*)buffer; // skip over string table entries
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178 buffer += sizeof(intptr_t);
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179 buffer += len;
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180
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181 len = *(intptr_t*)buffer; // skip over shared dictionary entries
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182 buffer += sizeof(intptr_t);
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183 buffer += len;
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184
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185 len = *(intptr_t*)buffer; // skip over package info table entries
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186 buffer += sizeof(intptr_t);
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187 buffer += len;
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188
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189 len = *(intptr_t*)buffer; // skip over package info table char[] arrays.
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190 buffer += sizeof(intptr_t);
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191 buffer += len;
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192
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193 oop* oop_array = (oop*)buffer;
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194 ReadClosure rc(&oop_array);
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195 serialize_oops(&rc);
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196 }
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