Mercurial > hg > truffle
annotate src/share/vm/memory/dump.cpp @ 6182:765ee2d1674b
7157365: jruby/bench.bench_timeout crashes with JVM internal error
Reviewed-by: jrose, kvn
| author | twisti |
|---|---|
| date | Mon, 18 Jun 2012 15:17:30 -0700 |
| parents | 8f972594effc |
| children | e9140bf80b4a 8150fa46d2ed |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "classfile/javaClasses.hpp" | |
| 27 #include "classfile/loaderConstraints.hpp" | |
| 28 #include "classfile/symbolTable.hpp" | |
| 29 #include "classfile/systemDictionary.hpp" | |
| 30 #include "gc_implementation/shared/spaceDecorator.hpp" | |
| 31 #include "memory/classify.hpp" | |
| 32 #include "memory/filemap.hpp" | |
| 33 #include "memory/oopFactory.hpp" | |
| 34 #include "memory/resourceArea.hpp" | |
| 35 #include "oops/methodDataOop.hpp" | |
| 36 #include "oops/oop.inline.hpp" | |
| 37 #include "runtime/javaCalls.hpp" | |
| 38 #include "runtime/signature.hpp" | |
| 39 #include "runtime/vmThread.hpp" | |
| 40 #include "runtime/vm_operations.hpp" | |
| 41 #include "utilities/copy.hpp" | |
| 0 | 42 |
| 43 | |
| 44 // Closure to set up the fingerprint field for all methods. | |
| 45 | |
| 46 class FingerprintMethodsClosure: public ObjectClosure { | |
| 47 public: | |
| 48 void do_object(oop obj) { | |
| 49 if (obj->is_method()) { | |
| 50 methodOop mobj = (methodOop)obj; | |
| 51 ResourceMark rm; | |
| 52 (new Fingerprinter(mobj))->fingerprint(); | |
| 53 } | |
| 54 } | |
| 55 }; | |
| 56 | |
| 57 | |
| 58 | |
| 59 // Closure to set the hash value (String.hash field) in all of the | |
| 60 // String objects in the heap. Setting the hash value is not required. | |
| 61 // However, setting the value in advance prevents the value from being | |
| 62 // written later, increasing the likelihood that the shared page contain | |
| 63 // the hash can be shared. | |
| 64 // | |
| 65 // NOTE THAT the algorithm in StringTable::hash_string() MUST MATCH the | |
| 66 // algorithm in java.lang.String.hashCode(). | |
| 67 | |
| 68 class StringHashCodeClosure: public OopClosure { | |
| 69 private: | |
| 70 Thread* THREAD; | |
| 71 int hash_offset; | |
| 72 public: | |
| 73 StringHashCodeClosure(Thread* t) { | |
| 74 THREAD = t; | |
| 75 hash_offset = java_lang_String::hash_offset_in_bytes(); | |
| 76 } | |
| 77 | |
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78 void do_oop(oop* p) { |
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79 if (p != NULL) { |
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80 oop obj = *p; |
| 6057 | 81 if (obj->klass() == SystemDictionary::String_klass() && |
| 82 java_lang_String::has_hash_field()) { | |
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83 int hash = java_lang_String::hash_string(obj); |
| 0 | 84 obj->int_field_put(hash_offset, hash); |
| 85 } | |
| 86 } | |
| 87 } | |
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88 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
| 0 | 89 }; |
| 90 | |
| 91 | |
| 92 // Remove data from objects which should not appear in the shared file | |
| 93 // (as it pertains only to the current JVM). | |
| 94 | |
| 95 class RemoveUnshareableInfoClosure : public ObjectClosure { | |
| 96 public: | |
| 97 void do_object(oop obj) { | |
| 98 // Zap data from the objects which is pertains only to this JVM. We | |
| 99 // want that data recreated in new JVMs when the shared file is used. | |
| 100 if (obj->is_method()) { | |
| 101 ((methodOop)obj)->remove_unshareable_info(); | |
| 102 } | |
| 103 else if (obj->is_klass()) { | |
| 104 Klass::cast((klassOop)obj)->remove_unshareable_info(); | |
| 105 } | |
| 106 | |
| 107 // Don't save compiler related special oops (shouldn't be any yet). | |
| 108 if (obj->is_methodData() || obj->is_compiledICHolder()) { | |
| 109 ShouldNotReachHere(); | |
| 110 } | |
| 111 } | |
| 112 }; | |
| 113 | |
| 114 | |
| 115 static bool mark_object(oop obj) { | |
| 116 if (obj != NULL && | |
| 117 !obj->is_shared() && | |
| 118 !obj->is_forwarded() && | |
| 119 !obj->is_gc_marked()) { | |
| 120 obj->set_mark(markOopDesc::prototype()->set_marked()); | |
| 121 return true; | |
| 122 } | |
| 123 | |
| 124 return false; | |
| 125 } | |
| 126 | |
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127 |
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128 class MoveSymbols : public SymbolClosure { |
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129 private: |
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130 char* _start; |
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131 char* _end; |
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132 char* _top; |
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133 int _count; |
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134 |
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135 bool in_shared_space(Symbol* sym) const { |
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136 return (char*)sym >= _start && (char*)sym < _end; |
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137 } |
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138 |
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139 Symbol* get_shared_copy(Symbol* sym) { |
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140 return sym->refcount() > 0 ? NULL : (Symbol*)(_start - sym->refcount()); |
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141 } |
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142 |
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143 Symbol* make_shared_copy(Symbol* sym) { |
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144 Symbol* new_sym = (Symbol*)_top; |
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145 int size = sym->object_size(); |
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146 _top += size * HeapWordSize; |
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147 if (_top <= _end) { |
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148 Copy::disjoint_words((HeapWord*)sym, (HeapWord*)new_sym, size); |
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149 // Encode a reference to the copy as a negative distance from _start |
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150 // When a symbol is being copied to a shared space |
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151 // during CDS archive creation, the original symbol is marked |
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152 // as relocated by putting a negative value to its _refcount field, |
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153 // This value is also used to find where exactly the shared copy is |
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154 // (see MoveSymbols::get_shared_copy), so that the other references |
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155 // to this symbol could be changed to point to the shared copy. |
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156 sym->_refcount = (int)(_start - (char*)new_sym); |
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157 // Mark the symbol in the shared archive as immortal so it is read only |
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158 // and not refcounted. |
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159 new_sym->_refcount = -1; |
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160 _count++; |
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161 } else { |
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162 report_out_of_shared_space(SharedMiscData); |
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163 } |
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164 return new_sym; |
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165 } |
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166 |
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167 public: |
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168 MoveSymbols(char* top, char* end) : |
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169 _start(top), _end(end), _top(top), _count(0) { } |
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170 |
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171 char* get_top() const { return _top; } |
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172 int count() const { return _count; } |
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173 |
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174 void do_symbol(Symbol** p) { |
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175 Symbol* sym = load_symbol(p); |
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176 if (sym != NULL && !in_shared_space(sym)) { |
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177 Symbol* new_sym = get_shared_copy(sym); |
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178 if (new_sym == NULL) { |
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179 // The symbol has not been relocated yet; copy it to _top address |
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180 assert(sym->refcount() > 0, "should have positive reference count"); |
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181 new_sym = make_shared_copy(sym); |
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182 } |
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183 // Make the reference point to the shared copy of the symbol |
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184 store_symbol(p, new_sym); |
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185 } |
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186 } |
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187 }; |
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188 |
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189 |
| 0 | 190 // Closure: mark objects closure. |
| 191 | |
| 192 class MarkObjectsOopClosure : public OopClosure { | |
| 193 public: | |
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194 void do_oop(oop* p) { mark_object(*p); } |
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195 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
| 0 | 196 }; |
| 197 | |
| 198 | |
| 199 class MarkObjectsSkippingKlassesOopClosure : public OopClosure { | |
| 200 public: | |
| 201 void do_oop(oop* pobj) { | |
| 202 oop obj = *pobj; | |
| 203 if (obj != NULL && | |
| 204 !obj->is_klass()) { | |
| 205 mark_object(obj); | |
| 206 } | |
| 207 } | |
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208 void do_oop(narrowOop* pobj) { ShouldNotReachHere(); } |
| 0 | 209 }; |
| 210 | |
| 211 | |
| 212 static void mark_object_recursive_skipping_klasses(oop obj) { | |
| 213 mark_object(obj); | |
| 214 if (obj != NULL) { | |
| 215 MarkObjectsSkippingKlassesOopClosure mark_all; | |
| 216 obj->oop_iterate(&mark_all); | |
| 217 } | |
| 218 } | |
| 219 | |
| 220 | |
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221 // Closure: mark common read-only objects |
| 0 | 222 |
| 223 class MarkCommonReadOnly : public ObjectClosure { | |
| 224 private: | |
| 225 MarkObjectsOopClosure mark_all; | |
| 226 public: | |
| 227 void do_object(oop obj) { | |
| 228 | |
| 229 // Mark all constMethod objects. | |
| 230 | |
| 231 if (obj->is_constMethod()) { | |
| 232 mark_object(obj); | |
| 233 mark_object(constMethodOop(obj)->stackmap_data()); | |
| 234 // Exception tables are needed by ci code during compilation. | |
| 235 mark_object(constMethodOop(obj)->exception_table()); | |
| 236 } | |
| 237 | |
| 238 // Mark objects referenced by klass objects which are read-only. | |
| 239 | |
| 240 else if (obj->is_klass()) { | |
| 241 Klass* k = Klass::cast((klassOop)obj); | |
| 242 mark_object(k->secondary_supers()); | |
| 243 | |
| 244 // The METHODS() OBJARRAYS CANNOT BE MADE READ-ONLY, even though | |
| 245 // it is never modified. Otherwise, they will be pre-marked; the | |
| 246 // GC marking phase will skip them; and by skipping them will fail | |
| 247 // to mark the methods objects referenced by the array. | |
| 248 | |
| 249 if (obj->blueprint()->oop_is_instanceKlass()) { | |
| 250 instanceKlass* ik = instanceKlass::cast((klassOop)obj); | |
| 251 mark_object(ik->method_ordering()); | |
| 252 mark_object(ik->local_interfaces()); | |
| 253 mark_object(ik->transitive_interfaces()); | |
| 254 mark_object(ik->fields()); | |
| 255 | |
| 256 mark_object(ik->class_annotations()); | |
| 257 | |
| 258 mark_object_recursive_skipping_klasses(ik->fields_annotations()); | |
| 259 mark_object_recursive_skipping_klasses(ik->methods_annotations()); | |
| 260 mark_object_recursive_skipping_klasses(ik->methods_parameter_annotations()); | |
| 261 mark_object_recursive_skipping_klasses(ik->methods_default_annotations()); | |
| 262 | |
| 263 typeArrayOop inner_classes = ik->inner_classes(); | |
| 264 if (inner_classes != NULL) { | |
| 265 mark_object(inner_classes); | |
| 266 } | |
| 267 } | |
| 268 } | |
| 269 } | |
| 270 }; | |
| 271 | |
| 272 | |
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273 // Closure: find symbol references in Java Heap objects |
| 0 | 274 |
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275 class CommonSymbolsClosure : public ObjectClosure { |
| 0 | 276 private: |
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277 SymbolClosure* _closure; |
| 0 | 278 public: |
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279 CommonSymbolsClosure(SymbolClosure* closure) : _closure(closure) { } |
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280 |
| 0 | 281 void do_object(oop obj) { |
| 282 | |
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283 // Traverse symbols referenced by method objects. |
| 0 | 284 |
| 285 if (obj->is_method()) { | |
| 286 methodOop m = methodOop(obj); | |
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287 constantPoolOop constants = m->constants(); |
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288 _closure->do_symbol(constants->symbol_at_addr(m->name_index())); |
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289 _closure->do_symbol(constants->symbol_at_addr(m->signature_index())); |
| 0 | 290 } |
| 291 | |
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292 // Traverse symbols referenced by klass objects which are read-only. |
| 0 | 293 |
| 294 else if (obj->is_klass()) { | |
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295 Klass* k = Klass::cast((klassOop)obj); |
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296 k->shared_symbols_iterate(_closure); |
| 0 | 297 |
| 298 if (obj->blueprint()->oop_is_instanceKlass()) { | |
| 299 instanceKlass* ik = instanceKlass::cast((klassOop)obj); | |
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300 instanceKlassHandle ik_h((klassOop)obj); |
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301 InnerClassesIterator iter(ik_h); |
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302 constantPoolOop constants = ik->constants(); |
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303 for (; !iter.done(); iter.next()) { |
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304 int index = iter.inner_name_index(); |
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305 |
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306 if (index != 0) { |
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307 _closure->do_symbol(constants->symbol_at_addr(index)); |
| 0 | 308 } |
| 309 } | |
| 310 } | |
| 311 } | |
| 312 | |
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313 // Traverse symbols referenced by other constantpool entries. |
| 0 | 314 |
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315 else if (obj->is_constantPool()) { |
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316 constantPoolOop(obj)->shared_symbols_iterate(_closure); |
| 0 | 317 } |
| 318 } | |
| 319 }; | |
| 320 | |
| 321 | |
| 322 // Closure: mark char arrays used by strings | |
| 323 | |
| 324 class MarkStringValues : public ObjectClosure { | |
| 325 private: | |
| 326 MarkObjectsOopClosure mark_all; | |
| 327 public: | |
| 328 void do_object(oop obj) { | |
| 329 | |
| 330 // Character arrays referenced by String objects are read-only. | |
| 331 | |
| 332 if (java_lang_String::is_instance(obj)) { | |
| 333 mark_object(java_lang_String::value(obj)); | |
| 334 } | |
| 335 } | |
| 336 }; | |
| 337 | |
| 338 | |
| 339 #ifdef DEBUG | |
| 340 // Closure: Check for objects left in the heap which have not been moved. | |
| 341 | |
| 342 class CheckRemainingObjects : public ObjectClosure { | |
| 343 private: | |
| 344 int count; | |
| 345 | |
| 346 public: | |
| 347 CheckRemainingObjects() { | |
| 348 count = 0; | |
| 349 } | |
| 350 | |
| 351 void do_object(oop obj) { | |
| 352 if (!obj->is_shared() && | |
| 353 !obj->is_forwarded()) { | |
| 354 ++count; | |
| 355 if (Verbose) { | |
| 356 tty->print("Unreferenced object: "); | |
| 357 obj->print_on(tty); | |
| 358 } | |
| 359 } | |
| 360 } | |
| 361 | |
| 362 void status() { | |
| 363 tty->print_cr("%d objects no longer referenced, not shared.", count); | |
| 364 } | |
| 365 }; | |
| 366 #endif | |
| 367 | |
| 368 | |
| 369 // Closure: Mark remaining objects read-write, except Strings. | |
| 370 | |
| 371 class MarkReadWriteObjects : public ObjectClosure { | |
| 372 private: | |
| 373 MarkObjectsOopClosure mark_objects; | |
| 374 public: | |
| 375 void do_object(oop obj) { | |
| 376 | |
| 377 // The METHODS() OBJARRAYS CANNOT BE MADE READ-ONLY, even though | |
| 378 // it is never modified. Otherwise, they will be pre-marked; the | |
| 379 // GC marking phase will skip them; and by skipping them will fail | |
| 380 // to mark the methods objects referenced by the array. | |
| 381 | |
| 382 if (obj->is_klass()) { | |
| 383 mark_object(obj); | |
| 384 Klass* k = klassOop(obj)->klass_part(); | |
| 385 mark_object(k->java_mirror()); | |
| 386 if (obj->blueprint()->oop_is_instanceKlass()) { | |
| 387 instanceKlass* ik = (instanceKlass*)k; | |
| 388 mark_object(ik->methods()); | |
| 389 mark_object(ik->constants()); | |
| 390 } | |
| 391 if (obj->blueprint()->oop_is_javaArray()) { | |
| 392 arrayKlass* ak = (arrayKlass*)k; | |
| 393 mark_object(ak->component_mirror()); | |
| 394 } | |
| 395 return; | |
| 396 } | |
| 397 | |
| 398 // Mark constantPool tags and the constantPoolCache. | |
| 399 | |
| 400 else if (obj->is_constantPool()) { | |
| 401 constantPoolOop pool = constantPoolOop(obj); | |
| 402 mark_object(pool->cache()); | |
| 403 pool->shared_tags_iterate(&mark_objects); | |
| 404 return; | |
| 405 } | |
| 406 | |
| 407 // Mark all method objects. | |
| 408 | |
| 409 if (obj->is_method()) { | |
| 410 mark_object(obj); | |
| 411 } | |
| 412 } | |
| 413 }; | |
| 414 | |
| 415 | |
| 416 // Closure: Mark String objects read-write. | |
| 417 | |
| 418 class MarkStringObjects : public ObjectClosure { | |
| 419 private: | |
| 420 MarkObjectsOopClosure mark_objects; | |
| 421 public: | |
| 422 void do_object(oop obj) { | |
| 423 | |
| 424 // Mark String objects referenced by constant pool entries. | |
| 425 | |
| 426 if (obj->is_constantPool()) { | |
| 427 constantPoolOop pool = constantPoolOop(obj); | |
| 428 pool->shared_strings_iterate(&mark_objects); | |
| 429 return; | |
| 430 } | |
| 431 } | |
| 432 }; | |
| 433 | |
| 434 | |
| 435 // Move objects matching specified type (ie. lock_bits) to the specified | |
| 436 // space. | |
| 437 | |
| 438 class MoveMarkedObjects : public ObjectClosure { | |
| 439 private: | |
| 440 OffsetTableContigSpace* _space; | |
| 441 bool _read_only; | |
| 442 | |
| 443 public: | |
| 444 MoveMarkedObjects(OffsetTableContigSpace* space, bool read_only) { | |
| 445 _space = space; | |
| 446 _read_only = read_only; | |
| 447 } | |
| 448 | |
| 449 void do_object(oop obj) { | |
| 450 if (obj->is_shared()) { | |
| 451 return; | |
| 452 } | |
| 453 if (obj->is_gc_marked() && obj->forwardee() == NULL) { | |
| 454 int s = obj->size(); | |
| 455 oop sh_obj = (oop)_space->allocate(s); | |
| 456 if (sh_obj == NULL) { | |
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457 report_out_of_shared_space(_read_only ? SharedReadOnly : SharedReadWrite); |
| 0 | 458 } |
| 459 if (PrintSharedSpaces && Verbose && WizardMode) { | |
| 460 tty->print_cr("\nMoveMarkedObjects: " PTR_FORMAT " -> " PTR_FORMAT " %s", obj, sh_obj, | |
| 461 (_read_only ? "ro" : "rw")); | |
| 462 } | |
| 463 Copy::aligned_disjoint_words((HeapWord*)obj, (HeapWord*)sh_obj, s); | |
| 464 obj->forward_to(sh_obj); | |
| 465 if (_read_only) { | |
| 466 // Readonly objects: set hash value to self pointer and make gc_marked. | |
| 467 sh_obj->forward_to(sh_obj); | |
| 468 } else { | |
| 469 sh_obj->init_mark(); | |
| 470 } | |
| 471 } | |
| 472 } | |
| 473 }; | |
| 474 | |
| 475 static void mark_and_move(oop obj, MoveMarkedObjects* move) { | |
| 476 if (mark_object(obj)) move->do_object(obj); | |
| 477 } | |
| 478 | |
| 479 enum order_policy { | |
| 480 OP_favor_startup = 0, | |
| 481 OP_balanced = 1, | |
| 482 OP_favor_runtime = 2 | |
| 483 }; | |
| 484 | |
| 485 static void mark_and_move_for_policy(order_policy policy, oop obj, MoveMarkedObjects* move) { | |
| 486 if (SharedOptimizeColdStartPolicy >= policy) mark_and_move(obj, move); | |
| 487 } | |
| 488 | |
| 489 class MarkAndMoveOrderedReadOnly : public ObjectClosure { | |
| 490 private: | |
| 491 MoveMarkedObjects *_move_ro; | |
| 492 | |
| 493 public: | |
| 494 MarkAndMoveOrderedReadOnly(MoveMarkedObjects *move_ro) : _move_ro(move_ro) {} | |
| 495 | |
| 496 void do_object(oop obj) { | |
| 497 if (obj->is_klass() && obj->blueprint()->oop_is_instanceKlass()) { | |
| 498 instanceKlass* ik = instanceKlass::cast((klassOop)obj); | |
| 499 int i; | |
| 500 | |
| 501 if (ik->super() != NULL) { | |
| 502 do_object(ik->super()); | |
| 503 } | |
| 504 | |
| 505 objArrayOop interfaces = ik->local_interfaces(); | |
| 506 mark_and_move_for_policy(OP_favor_startup, interfaces, _move_ro); | |
| 507 for(i = 0; i < interfaces->length(); i++) { | |
| 508 klassOop k = klassOop(interfaces->obj_at(i)); | |
| 509 do_object(k); | |
| 510 } | |
| 511 | |
| 512 objArrayOop methods = ik->methods(); | |
| 513 for(i = 0; i < methods->length(); i++) { | |
| 514 methodOop m = methodOop(methods->obj_at(i)); | |
| 515 mark_and_move_for_policy(OP_favor_startup, m->constMethod(), _move_ro); | |
| 516 mark_and_move_for_policy(OP_favor_runtime, m->constMethod()->exception_table(), _move_ro); | |
| 517 mark_and_move_for_policy(OP_favor_runtime, m->constMethod()->stackmap_data(), _move_ro); | |
| 518 } | |
| 519 | |
| 520 mark_and_move_for_policy(OP_favor_startup, ik->transitive_interfaces(), _move_ro); | |
| 521 mark_and_move_for_policy(OP_favor_startup, ik->fields(), _move_ro); | |
| 522 | |
| 523 mark_and_move_for_policy(OP_favor_runtime, ik->secondary_supers(), _move_ro); | |
| 524 mark_and_move_for_policy(OP_favor_runtime, ik->method_ordering(), _move_ro); | |
| 525 mark_and_move_for_policy(OP_favor_runtime, ik->class_annotations(), _move_ro); | |
| 526 mark_and_move_for_policy(OP_favor_runtime, ik->fields_annotations(), _move_ro); | |
| 527 mark_and_move_for_policy(OP_favor_runtime, ik->methods_annotations(), _move_ro); | |
| 528 mark_and_move_for_policy(OP_favor_runtime, ik->methods_parameter_annotations(), _move_ro); | |
| 529 mark_and_move_for_policy(OP_favor_runtime, ik->methods_default_annotations(), _move_ro); | |
| 530 mark_and_move_for_policy(OP_favor_runtime, ik->inner_classes(), _move_ro); | |
| 531 mark_and_move_for_policy(OP_favor_runtime, ik->secondary_supers(), _move_ro); | |
| 532 } | |
| 533 } | |
| 534 }; | |
| 535 | |
| 536 class MarkAndMoveOrderedReadWrite: public ObjectClosure { | |
| 537 private: | |
| 538 MoveMarkedObjects *_move_rw; | |
| 539 | |
| 540 public: | |
| 541 MarkAndMoveOrderedReadWrite(MoveMarkedObjects *move_rw) : _move_rw(move_rw) {} | |
| 542 | |
| 543 void do_object(oop obj) { | |
| 544 if (obj->is_klass() && obj->blueprint()->oop_is_instanceKlass()) { | |
| 545 instanceKlass* ik = instanceKlass::cast((klassOop)obj); | |
| 546 int i; | |
| 547 | |
| 548 mark_and_move_for_policy(OP_favor_startup, ik->as_klassOop(), _move_rw); | |
| 549 | |
| 550 if (ik->super() != NULL) { | |
| 551 do_object(ik->super()); | |
| 552 } | |
| 553 | |
| 554 objArrayOop interfaces = ik->local_interfaces(); | |
| 555 for(i = 0; i < interfaces->length(); i++) { | |
| 556 klassOop k = klassOop(interfaces->obj_at(i)); | |
| 557 mark_and_move_for_policy(OP_favor_startup, k, _move_rw); | |
| 558 do_object(k); | |
| 559 } | |
| 560 | |
| 561 objArrayOop methods = ik->methods(); | |
| 562 mark_and_move_for_policy(OP_favor_startup, methods, _move_rw); | |
| 563 for(i = 0; i < methods->length(); i++) { | |
| 564 methodOop m = methodOop(methods->obj_at(i)); | |
| 565 mark_and_move_for_policy(OP_favor_startup, m, _move_rw); | |
| 566 mark_and_move_for_policy(OP_favor_startup, ik->constants(), _move_rw); // idempotent | |
| 567 mark_and_move_for_policy(OP_balanced, ik->constants()->cache(), _move_rw); // idempotent | |
| 568 mark_and_move_for_policy(OP_balanced, ik->constants()->tags(), _move_rw); // idempotent | |
| 569 } | |
| 570 | |
| 571 mark_and_move_for_policy(OP_favor_startup, ik->as_klassOop()->klass(), _move_rw); | |
| 572 mark_and_move_for_policy(OP_favor_startup, ik->constants()->klass(), _move_rw); | |
| 573 | |
| 574 // Although Java mirrors are marked in MarkReadWriteObjects, | |
| 575 // apparently they were never moved into shared spaces since | |
| 576 // MoveMarkedObjects skips marked instance oops. This may | |
| 577 // be a bug in the original implementation or simply the vestige | |
| 578 // of an abandoned experiment. Nevertheless we leave a hint | |
| 579 // here in case this capability is ever correctly implemented. | |
| 580 // | |
| 581 // mark_and_move_for_policy(OP_favor_runtime, ik->java_mirror(), _move_rw); | |
| 582 } | |
| 583 } | |
| 584 | |
| 585 }; | |
| 586 | |
| 587 // Adjust references in oops to refer to shared spaces. | |
| 588 | |
| 589 class ResolveForwardingClosure: public OopClosure { | |
| 590 public: | |
| 591 void do_oop(oop* p) { | |
| 592 oop obj = *p; | |
| 593 if (!obj->is_shared()) { | |
| 594 if (obj != NULL) { | |
| 595 oop f = obj->forwardee(); | |
| 596 guarantee(f->is_shared(), "Oop doesn't refer to shared space."); | |
| 597 *p = f; | |
| 598 } | |
| 599 } | |
| 600 } | |
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601 void do_oop(narrowOop* pobj) { ShouldNotReachHere(); } |
| 0 | 602 }; |
| 603 | |
| 604 | |
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605 // The methods array must be reordered by Symbol* address. |
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606 // (See classFileParser.cpp where methods in a class are originally |
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607 // sorted). The addresses of symbols have been changed as a result |
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608 // of moving to the shared space. |
| 0 | 609 |
| 610 class SortMethodsClosure: public ObjectClosure { | |
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611 public: |
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612 void do_object(oop obj) { |
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613 if (obj->blueprint()->oop_is_instanceKlass()) { |
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614 instanceKlass* ik = instanceKlass::cast((klassOop)obj); |
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615 methodOopDesc::sort_methods(ik->methods(), |
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616 ik->methods_annotations(), |
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617 ik->methods_parameter_annotations(), |
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618 ik->methods_default_annotations(), |
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619 true /* idempotent, slow */); |
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620 } |
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621 } |
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622 }; |
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623 |
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624 // Vtable and Itable indices are calculated based on methods array |
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625 // order (see klassItable::compute_itable_index()). Must reinitialize |
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626 // after ALL methods of ALL classes have been reordered. |
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627 // We assume that since checkconstraints is false, this method |
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628 // cannot throw an exception. An exception here would be |
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629 // problematic since this is the VMThread, not a JavaThread. |
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630 |
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631 class ReinitializeTables: public ObjectClosure { |
| 0 | 632 private: |
| 633 Thread* _thread; | |
| 634 | |
| 635 public: | |
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636 ReinitializeTables(Thread* thread) : _thread(thread) {} |
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637 |
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638 // Initialize super vtable first, check if already initialized to avoid |
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639 // quadradic behavior. The vtable is cleared in remove_unshareable_info. |
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640 void reinitialize_vtables(klassOop k) { |
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641 if (k->blueprint()->oop_is_instanceKlass()) { |
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642 instanceKlass* ik = instanceKlass::cast(k); |
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643 if (ik->vtable()->is_initialized()) return; |
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644 if (ik->super() != NULL) { |
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645 reinitialize_vtables(ik->super()); |
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646 } |
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647 ik->vtable()->initialize_vtable(false, _thread); |
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648 } |
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649 } |
| 0 | 650 |
| 651 void do_object(oop obj) { | |
| 652 if (obj->blueprint()->oop_is_instanceKlass()) { | |
| 653 instanceKlass* ik = instanceKlass::cast((klassOop)obj); | |
|
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654 ResourceMark rm(_thread); |
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655 ik->itable()->initialize_itable(false, _thread); |
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656 reinitialize_vtables((klassOop)obj); |
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657 #ifdef ASSERT |
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658 ik->vtable()->verify(tty, true); |
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659 #endif // ASSERT |
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660 } else if (obj->blueprint()->oop_is_arrayKlass()) { |
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661 // The vtable for array klasses are that of its super class, |
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662 // ie. java.lang.Object. |
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663 arrayKlass* ak = arrayKlass::cast((klassOop)obj); |
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664 if (ak->vtable()->is_initialized()) return; |
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665 ak->vtable()->initialize_vtable(false, _thread); |
| 0 | 666 } |
| 667 } | |
| 668 }; | |
| 669 | |
| 670 | |
| 671 // Adjust references in oops to refer to shared spaces. | |
| 672 | |
| 673 class PatchOopsClosure: public ObjectClosure { | |
| 674 private: | |
| 675 Thread* _thread; | |
| 676 ResolveForwardingClosure resolve; | |
| 677 | |
| 678 public: | |
| 679 PatchOopsClosure(Thread* thread) : _thread(thread) {} | |
| 680 | |
| 681 void do_object(oop obj) { | |
| 682 obj->oop_iterate_header(&resolve); | |
| 683 obj->oop_iterate(&resolve); | |
| 684 | |
| 685 assert(obj->klass()->is_shared(), "Klass not pointing into shared space."); | |
| 686 | |
| 687 // If the object is a Java object or class which might (in the | |
| 688 // future) contain a reference to a young gen object, add it to the | |
| 689 // list. | |
| 690 | |
| 691 if (obj->is_klass() || obj->is_instance()) { | |
| 692 if (obj->is_klass() || | |
| 1142 | 693 obj->is_a(SystemDictionary::Class_klass()) || |
| 694 obj->is_a(SystemDictionary::Throwable_klass())) { | |
| 0 | 695 // Do nothing |
| 696 } | |
| 1142 | 697 else if (obj->is_a(SystemDictionary::String_klass())) { |
| 0 | 698 // immutable objects. |
| 699 } else { | |
| 700 // someone added an object we hadn't accounted for. | |
| 701 ShouldNotReachHere(); | |
| 702 } | |
| 703 } | |
| 704 } | |
| 705 }; | |
| 706 | |
| 707 | |
| 708 // Empty the young and old generations. | |
| 709 | |
| 710 class ClearSpaceClosure : public SpaceClosure { | |
| 711 public: | |
| 712 void do_space(Space* s) { | |
|
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713 s->clear(SpaceDecorator::Mangle); |
| 0 | 714 } |
| 715 }; | |
| 716 | |
| 717 | |
| 718 // Closure for serializing initialization data out to a data area to be | |
| 719 // written to the shared file. | |
| 720 | |
| 721 class WriteClosure : public SerializeOopClosure { | |
| 722 private: | |
| 723 oop* top; | |
| 724 char* end; | |
| 725 | |
| 726 inline void check_space() { | |
| 727 if ((char*)top + sizeof(oop) > end) { | |
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728 report_out_of_shared_space(SharedMiscData); |
| 0 | 729 } |
| 730 } | |
| 731 | |
| 732 | |
| 733 public: | |
| 734 WriteClosure(char* md_top, char* md_end) { | |
| 735 top = (oop*)md_top; | |
| 736 end = md_end; | |
| 737 } | |
| 738 | |
| 739 char* get_top() { return (char*)top; } | |
| 740 | |
| 741 void do_oop(oop* p) { | |
| 742 check_space(); | |
| 743 oop obj = *p; | |
| 744 assert(obj->is_oop_or_null(), "invalid oop"); | |
| 745 assert(obj == NULL || obj->is_shared(), | |
| 746 "Oop in shared space not pointing into shared space."); | |
| 747 *top = obj; | |
| 748 ++top; | |
| 749 } | |
| 750 | |
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751 void do_oop(narrowOop* pobj) { ShouldNotReachHere(); } |
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752 |
| 0 | 753 void do_int(int* p) { |
| 754 check_space(); | |
| 755 *top = (oop)(intptr_t)*p; | |
| 756 ++top; | |
| 757 } | |
| 758 | |
| 759 void do_size_t(size_t* p) { | |
| 760 check_space(); | |
| 761 *top = (oop)(intptr_t)*p; | |
| 762 ++top; | |
| 763 } | |
| 764 | |
| 765 void do_ptr(void** p) { | |
| 766 check_space(); | |
| 767 *top = (oop)*p; | |
| 768 ++top; | |
| 769 } | |
| 770 | |
| 771 void do_ptr(HeapWord** p) { do_ptr((void **) p); } | |
| 772 | |
| 773 void do_tag(int tag) { | |
| 774 check_space(); | |
| 775 *top = (oop)(intptr_t)tag; | |
| 776 ++top; | |
| 777 } | |
| 778 | |
| 779 void do_region(u_char* start, size_t size) { | |
| 780 if ((char*)top + size > end) { | |
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781 report_out_of_shared_space(SharedMiscData); |
| 0 | 782 } |
| 783 assert((intptr_t)start % sizeof(oop) == 0, "bad alignment"); | |
| 784 assert(size % sizeof(oop) == 0, "bad size"); | |
| 785 do_tag((int)size); | |
| 786 while (size > 0) { | |
| 787 *top = *(oop*)start; | |
| 788 ++top; | |
| 789 start += sizeof(oop); | |
| 790 size -= sizeof(oop); | |
| 791 } | |
| 792 } | |
| 793 | |
| 794 bool reading() const { return false; } | |
| 795 }; | |
| 796 | |
| 797 | |
| 798 class ResolveConstantPoolsClosure : public ObjectClosure { | |
| 799 private: | |
| 800 TRAPS; | |
| 801 public: | |
| 802 ResolveConstantPoolsClosure(Thread *t) { | |
| 803 __the_thread__ = t; | |
| 804 } | |
| 805 void do_object(oop obj) { | |
| 806 if (obj->is_constantPool()) { | |
| 807 constantPoolOop cpool = (constantPoolOop)obj; | |
| 808 int unresolved = cpool->pre_resolve_shared_klasses(THREAD); | |
| 809 } | |
| 810 } | |
| 811 }; | |
| 812 | |
| 813 | |
| 814 // Print a summary of the contents of the read/write spaces to help | |
| 815 // identify objects which might be able to be made read-only. At this | |
| 816 // point, the objects have been written, and we can trash them as | |
| 817 // needed. | |
| 818 | |
| 819 static void print_contents() { | |
| 820 if (PrintSharedSpaces) { | |
| 821 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 822 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
| 823 | |
| 824 // High level summary of the read-only space: | |
| 825 | |
| 826 ClassifyObjectClosure coc; | |
| 827 tty->cr(); tty->print_cr("ReadOnly space:"); | |
| 828 gen->ro_space()->object_iterate(&coc); | |
| 829 coc.print(); | |
| 830 | |
| 831 // High level summary of the read-write space: | |
| 832 | |
| 833 coc.reset(); | |
| 834 tty->cr(); tty->print_cr("ReadWrite space:"); | |
| 835 gen->rw_space()->object_iterate(&coc); | |
| 836 coc.print(); | |
| 837 | |
| 838 // Reset counters | |
| 839 | |
| 840 ClearAllocCountClosure cacc; | |
| 841 gen->ro_space()->object_iterate(&cacc); | |
| 842 gen->rw_space()->object_iterate(&cacc); | |
| 843 coc.reset(); | |
| 844 | |
| 845 // Lower level summary of the read-only space: | |
| 846 | |
| 847 gen->ro_space()->object_iterate(&coc); | |
| 848 tty->cr(); tty->print_cr("ReadOnly space:"); | |
| 849 ClassifyInstanceKlassClosure cikc; | |
| 850 gen->rw_space()->object_iterate(&cikc); | |
| 851 cikc.print(); | |
| 852 | |
| 853 // Reset counters | |
| 854 | |
| 855 gen->ro_space()->object_iterate(&cacc); | |
| 856 gen->rw_space()->object_iterate(&cacc); | |
| 857 coc.reset(); | |
| 858 | |
| 859 // Lower level summary of the read-write space: | |
| 860 | |
| 861 gen->rw_space()->object_iterate(&coc); | |
| 862 cikc.reset(); | |
| 863 tty->cr(); tty->print_cr("ReadWrite space:"); | |
| 864 gen->rw_space()->object_iterate(&cikc); | |
| 865 cikc.print(); | |
| 866 } | |
| 867 } | |
| 868 | |
| 869 | |
| 870 // Patch C++ vtable pointer in klass oops. | |
| 871 | |
| 872 // Klass objects contain references to c++ vtables in the JVM library. | |
| 873 // Fix them to point to our constructed vtables. However, don't iterate | |
| 874 // across the space while doing this, as that causes the vtables to be | |
| 875 // patched, undoing our useful work. Instead, iterate to make a list, | |
| 876 // then use the list to do the fixing. | |
| 408 | 877 // |
| 878 // Our constructed vtables: | |
| 879 // Dump time: | |
| 880 // 1. init_self_patching_vtbl_list: table of pointers to current virtual method addrs | |
| 881 // 2. generate_vtable_methods: create jump table, appended to above vtbl_list | |
| 882 // 3. PatchKlassVtables: for Klass list, patch the vtable entry to point to jump table | |
| 883 // rather than to current vtbl | |
| 884 // Table layout: NOTE FIXED SIZE | |
| 885 // 1. vtbl pointers | |
| 886 // 2. #Klass X #virtual methods per Klass | |
| 887 // 1 entry for each, in the order: | |
| 888 // Klass1:method1 entry, Klass1:method2 entry, ... Klass1:method<num_virtuals> entry | |
| 889 // Klass2:method1 entry, Klass2:method2 entry, ... Klass2:method<num_virtuals> entry | |
| 890 // ... | |
| 891 // Klass<vtbl_list_size>:method1 entry, Klass<vtbl_list_size>:method2 entry, | |
| 892 // ... Klass<vtbl_list_size>:method<num_virtuals> entry | |
| 893 // Sample entry: (Sparc): | |
| 894 // save(sp, -256, sp) | |
| 895 // ba,pt common_code | |
| 896 // mov XXX, %L0 %L0 gets: Klass index <<8 + method index (note: max method index 255) | |
| 897 // | |
| 898 // Restore time: | |
| 899 // 1. initialize_oops: reserve space for table | |
| 900 // 2. init_self_patching_vtbl_list: update pointers to NEW virtual method addrs in text | |
| 901 // | |
| 902 // Execution time: | |
| 903 // First virtual method call for any object of these Klass types: | |
| 904 // 1. object->klass->klass_part | |
| 905 // 2. vtable entry for that klass_part points to the jump table entries | |
| 906 // 3. branches to common_code with %O0/klass_part, %L0: Klass index <<8 + method index | |
| 907 // 4. common_code: | |
| 908 // Get address of new vtbl pointer for this Klass from updated table | |
| 909 // Update new vtbl pointer in the Klass: future virtual calls go direct | |
| 910 // Jump to method, using new vtbl pointer and method index | |
| 0 | 911 |
| 912 class PatchKlassVtables: public ObjectClosure { | |
| 913 private: | |
| 914 GrowableArray<klassOop>* _klass_objects; | |
| 915 | |
| 916 public: | |
|
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917 PatchKlassVtables() { |
| 0 | 918 _klass_objects = new GrowableArray<klassOop>(); |
| 919 } | |
| 920 | |
| 921 void do_object(oop obj) { | |
| 922 if (obj->is_klass()) { | |
| 923 _klass_objects->append(klassOop(obj)); | |
| 924 } | |
| 925 } | |
| 926 | |
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927 void patch(void** vtbl_list, void* new_vtable_start) { |
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928 int n = _klass_objects->length(); |
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929 for (int i = 0; i < n; i++) { |
| 0 | 930 klassOop obj = (klassOop)_klass_objects->at(i); |
| 931 Klass* k = obj->klass_part(); | |
|
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932 *(void**)k = CompactingPermGenGen::find_matching_vtbl_ptr( |
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933 vtbl_list, new_vtable_start, k); |
| 0 | 934 } |
| 935 } | |
| 936 }; | |
| 937 | |
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938 // Walk through all symbols and patch their vtable pointers. |
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939 // Note that symbols have vtable pointers only in non-product builds |
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940 // (see allocation.hpp). |
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941 |
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942 #ifndef PRODUCT |
|
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943 class PatchSymbolVtables: public SymbolClosure { |
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944 private: |
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945 void* _new_vtbl_ptr; |
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946 |
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947 public: |
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948 PatchSymbolVtables(void** vtbl_list, void* new_vtable_start) { |
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949 Symbol s; |
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950 _new_vtbl_ptr = CompactingPermGenGen::find_matching_vtbl_ptr( |
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951 vtbl_list, new_vtable_start, &s); |
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952 } |
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953 |
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954 void do_symbol(Symbol** p) { |
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955 Symbol* sym = load_symbol(p); |
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956 *(void**)sym = _new_vtbl_ptr; |
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957 } |
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958 }; |
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959 #endif |
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960 |
| 0 | 961 |
| 962 // Populate the shared space. | |
| 963 | |
| 964 class VM_PopulateDumpSharedSpace: public VM_Operation { | |
| 965 private: | |
| 966 GrowableArray<oop> *_class_promote_order; | |
| 967 OffsetTableContigSpace* _ro_space; | |
| 968 OffsetTableContigSpace* _rw_space; | |
| 969 VirtualSpace* _md_vs; | |
| 970 VirtualSpace* _mc_vs; | |
| 971 | |
| 972 public: | |
| 973 VM_PopulateDumpSharedSpace(GrowableArray<oop> *class_promote_order, | |
| 974 OffsetTableContigSpace* ro_space, | |
| 975 OffsetTableContigSpace* rw_space, | |
| 976 VirtualSpace* md_vs, VirtualSpace* mc_vs) { | |
| 977 _class_promote_order = class_promote_order; | |
| 978 _ro_space = ro_space; | |
| 979 _rw_space = rw_space; | |
| 980 _md_vs = md_vs; | |
| 981 _mc_vs = mc_vs; | |
| 982 } | |
| 983 | |
| 984 VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; } | |
| 985 void doit() { | |
| 986 Thread* THREAD = VMThread::vm_thread(); | |
| 987 NOT_PRODUCT(SystemDictionary::verify();) | |
| 988 // The following guarantee is meant to ensure that no loader constraints | |
| 989 // exist yet, since the constraints table is not shared. This becomes | |
| 990 // more important now that we don't re-initialize vtables/itables for | |
| 991 // shared classes at runtime, where constraints were previously created. | |
| 992 guarantee(SystemDictionary::constraints()->number_of_entries() == 0, | |
| 993 "loader constraints are not saved"); | |
| 710 | 994 // Revisit and implement this if we prelink method handle call sites: |
| 714 | 995 guarantee(SystemDictionary::invoke_method_table() == NULL || |
| 996 SystemDictionary::invoke_method_table()->number_of_entries() == 0, | |
| 710 | 997 "invoke method table is not saved"); |
| 0 | 998 GenCollectedHeap* gch = GenCollectedHeap::heap(); |
| 999 | |
| 1000 // At this point, many classes have been loaded. | |
| 1001 | |
| 1002 // Update all the fingerprints in the shared methods. | |
| 1003 | |
| 1004 tty->print("Calculating fingerprints ... "); | |
| 1005 FingerprintMethodsClosure fpmc; | |
| 1006 gch->object_iterate(&fpmc); | |
| 1007 tty->print_cr("done. "); | |
| 1008 | |
| 1009 // Remove all references outside the heap. | |
| 1010 | |
| 1011 tty->print("Removing unshareable information ... "); | |
| 1012 RemoveUnshareableInfoClosure ruic; | |
| 1013 gch->object_iterate(&ruic); | |
| 1014 tty->print_cr("done. "); | |
| 1015 | |
| 1016 // Move the objects in three passes. | |
| 1017 | |
| 1018 MarkObjectsOopClosure mark_all; | |
| 1019 MarkCommonReadOnly mark_common_ro; | |
| 1020 MarkStringValues mark_string_values; | |
| 1021 MarkReadWriteObjects mark_rw; | |
| 1022 MarkStringObjects mark_strings; | |
| 1023 MoveMarkedObjects move_ro(_ro_space, true); | |
| 1024 MoveMarkedObjects move_rw(_rw_space, false); | |
| 1025 | |
| 1026 // The SharedOptimizeColdStart VM option governs the new layout | |
| 1027 // algorithm for promoting classes into the shared archive. | |
| 1028 // The general idea is to minimize cold start time by laying | |
| 1029 // out the objects in the order they are accessed at startup time. | |
| 1030 // By doing this we are trying to eliminate out-of-order accesses | |
| 1031 // in the shared archive. This benefits cold startup time by making | |
| 1032 // disk reads as sequential as possible during class loading and | |
| 1033 // bootstrapping activities. There may also be a small secondary | |
| 1034 // effect of better "packing" of more commonly used data on a smaller | |
| 1035 // number of pages, although no direct benefit has been measured from | |
| 1036 // this effect. | |
| 1037 // | |
| 1038 // At the class level of granularity, the promotion order is dictated | |
| 1039 // by the classlist file whose generation is discussed elsewhere. | |
| 1040 // | |
| 1041 // At smaller granularity, optimal ordering was determined by an | |
| 1042 // offline analysis of object access order in the shared archive. | |
| 1043 // The dbx watchpoint facility, combined with SA post-processing, | |
| 1044 // was used to observe common access patterns primarily during | |
| 1045 // classloading. This information was used to craft the promotion | |
| 1046 // order seen in the following closures. | |
| 1047 // | |
| 1048 // The observed access order is mostly governed by what happens | |
| 1049 // in SystemDictionary::load_shared_class(). NOTE WELL - care | |
| 1050 // should be taken when making changes to this method, because it | |
| 1051 // may invalidate assumptions made about access order! | |
| 1052 // | |
| 1053 // (Ideally, there would be a better way to manage changes to | |
| 1054 // the access order. Unfortunately a generic in-VM solution for | |
| 1055 // dynamically observing access order and optimizing shared | |
| 1056 // archive layout is pretty difficult. We go with the static | |
| 1057 // analysis because the code is fairly mature at this point | |
| 1058 // and we're betting that the access order won't change much.) | |
| 1059 | |
| 1060 MarkAndMoveOrderedReadOnly mark_and_move_ordered_ro(&move_ro); | |
| 1061 MarkAndMoveOrderedReadWrite mark_and_move_ordered_rw(&move_rw); | |
| 1062 | |
| 1063 // Set up the share data and shared code segments. | |
| 1064 | |
| 1065 char* md_top = _md_vs->low(); | |
| 1066 char* md_end = _md_vs->high(); | |
| 1067 char* mc_top = _mc_vs->low(); | |
| 1068 char* mc_end = _mc_vs->high(); | |
| 1069 | |
| 1070 // Reserve space for the list of klassOops whose vtables are used | |
| 1071 // for patching others as needed. | |
| 1072 | |
| 1073 void** vtbl_list = (void**)md_top; | |
| 1074 int vtbl_list_size = CompactingPermGenGen::vtbl_list_size; | |
| 1075 Universe::init_self_patching_vtbl_list(vtbl_list, vtbl_list_size); | |
| 1076 | |
| 1077 md_top += vtbl_list_size * sizeof(void*); | |
| 1078 void* vtable = md_top; | |
| 1079 | |
| 1080 // Reserve space for a new dummy vtable for klass objects in the | |
| 1081 // heap. Generate self-patching vtable entries. | |
| 1082 | |
| 1083 CompactingPermGenGen::generate_vtable_methods(vtbl_list, | |
| 1084 &vtable, | |
| 1085 &md_top, md_end, | |
| 1086 &mc_top, mc_end); | |
| 1087 | |
|
2177
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1088 // Reserve space for the total size and the number of stored symbols. |
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1089 |
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1090 md_top += sizeof(intptr_t) * 2; |
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1091 |
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1092 MoveSymbols move_symbols(md_top, md_end); |
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1093 CommonSymbolsClosure traverse_common_symbols(&move_symbols); |
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1094 |
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1095 // Phase 1a: remove symbols with _refcount == 0 |
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1096 |
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1097 SymbolTable::unlink(); |
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1098 |
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1099 // Phase 1b: move commonly used symbols referenced by oop fields. |
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1100 |
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1101 tty->print("Moving common symbols to metadata section at " PTR_FORMAT " ... ", |
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1102 move_symbols.get_top()); |
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1103 gch->object_iterate(&traverse_common_symbols); |
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1104 tty->print_cr("done. "); |
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1105 |
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1106 // Phase 1c: move known names and signatures. |
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1107 |
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1108 tty->print("Moving vmSymbols to metadata section at " PTR_FORMAT " ... ", |
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1109 move_symbols.get_top()); |
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1110 vmSymbols::symbols_do(&move_symbols); |
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1111 tty->print_cr("done. "); |
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1112 |
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1113 // Phase 1d: move the remaining symbols by scanning the whole SymbolTable. |
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1114 |
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1115 void* extra_symbols = move_symbols.get_top(); |
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1116 tty->print("Moving the remaining symbols to metadata section at " PTR_FORMAT " ... ", |
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1117 move_symbols.get_top()); |
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1118 SymbolTable::symbols_do(&move_symbols); |
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1119 tty->print_cr("done. "); |
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1120 |
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1121 // Record the total length of all symbols at the beginning of the block. |
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1122 ((intptr_t*)md_top)[-2] = move_symbols.get_top() - md_top; |
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1123 ((intptr_t*)md_top)[-1] = move_symbols.count(); |
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1124 tty->print_cr("Moved %d symbols, %d bytes.", |
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1125 move_symbols.count(), move_symbols.get_top() - md_top); |
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1126 // Advance the pointer to the end of symbol store. |
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1127 md_top = move_symbols.get_top(); |
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1128 |
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1129 |
|
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1130 // Phase 2: move commonly used read-only objects to the read-only space. |
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1131 |
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1132 if (SharedOptimizeColdStart) { |
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1133 tty->print("Moving pre-ordered read-only objects to shared space at " PTR_FORMAT " ... ", |
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1134 _ro_space->top()); |
|
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1135 for (int i = 0; i < _class_promote_order->length(); i++) { |
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1136 oop obj = _class_promote_order->at(i); |
|
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1137 mark_and_move_ordered_ro.do_object(obj); |
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1138 } |
|
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1139 tty->print_cr("done. "); |
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1140 } |
|
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1141 |
|
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1142 tty->print("Moving read-only objects to shared space at " PTR_FORMAT " ... ", |
|
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1143 _ro_space->top()); |
|
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|
1144 gch->object_iterate(&mark_common_ro); |
|
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|
1145 gch->object_iterate(&move_ro); |
|
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1146 tty->print_cr("done. "); |
|
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|
1147 |
|
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1148 // Phase 3: move String character arrays to the read-only space. |
|
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6990754: Use native memory and reference counting to implement SymbolTable
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|
1149 |
|
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1150 tty->print("Moving string char arrays to shared space at " PTR_FORMAT " ... ", |
|
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|
1151 _ro_space->top()); |
|
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|
1152 gch->object_iterate(&mark_string_values); |
|
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6990754: Use native memory and reference counting to implement SymbolTable
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|
1153 gch->object_iterate(&move_ro); |
|
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1154 tty->print_cr("done. "); |
|
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|
1155 |
|
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1156 // Phase 4: move read-write objects to the read-write space, except |
|
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|
1157 // Strings. |
|
3582bf76420e
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|
1158 |
|
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1159 if (SharedOptimizeColdStart) { |
|
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|
1160 tty->print("Moving pre-ordered read-write objects to shared space at " PTR_FORMAT " ... ", |
|
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|
1161 _rw_space->top()); |
|
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|
1162 for (int i = 0; i < _class_promote_order->length(); i++) { |
|
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1163 oop obj = _class_promote_order->at(i); |
|
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|
1164 mark_and_move_ordered_rw.do_object(obj); |
|
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|
1165 } |
|
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|
1166 tty->print_cr("done. "); |
|
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|
1167 } |
|
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|
1168 tty->print("Moving read-write objects to shared space at " PTR_FORMAT " ... ", |
|
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|
1169 _rw_space->top()); |
|
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|
1170 Universe::oops_do(&mark_all, true); |
|
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1171 SystemDictionary::oops_do(&mark_all); |
|
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1172 oop tmp = Universe::arithmetic_exception_instance(); |
|
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|
1173 mark_object(java_lang_Throwable::message(tmp)); |
|
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1174 gch->object_iterate(&mark_rw); |
|
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|
1175 gch->object_iterate(&move_rw); |
|
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|
1176 tty->print_cr("done. "); |
|
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|
1177 |
|
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1178 // Phase 5: move String objects to the read-write space. |
|
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|
1179 |
|
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|
1180 tty->print("Moving String objects to shared space at " PTR_FORMAT " ... ", |
|
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|
1181 _rw_space->top()); |
|
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|
1182 StringTable::oops_do(&mark_all); |
|
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|
1183 gch->object_iterate(&mark_strings); |
|
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|
1184 gch->object_iterate(&move_rw); |
|
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6990754: Use native memory and reference counting to implement SymbolTable
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|
1185 tty->print_cr("done. "); |
|
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1186 tty->print_cr("Read-write space ends at " PTR_FORMAT ", %d bytes.", |
|
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|
1187 _rw_space->top(), _rw_space->used()); |
|
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|
1188 |
|
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|
1189 #ifdef DEBUG |
|
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1190 // Check: scan for objects which were not moved. |
|
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|
1191 |
|
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1192 CheckRemainingObjects check_objects; |
|
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1193 gch->object_iterate(&check_objects); |
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1194 check_objects.status(); |
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1195 #endif |
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1196 |
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1197 // Resolve forwarding in objects and saved C++ structures |
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1198 tty->print("Updating references to shared objects ... "); |
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1199 ResolveForwardingClosure resolve; |
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1200 Universe::oops_do(&resolve); |
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1201 SystemDictionary::oops_do(&resolve); |
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1202 StringTable::oops_do(&resolve); |
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1203 |
| 0 | 1204 // Fix (forward) all of the references in these shared objects (which |
| 1205 // are required to point ONLY to objects in the shared spaces). | |
| 1206 // Also, create a list of all objects which might later contain a | |
| 1207 // reference to a younger generation object. | |
| 1208 | |
| 1209 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
| 1210 PatchOopsClosure patch(THREAD); | |
| 1211 gen->ro_space()->object_iterate(&patch); | |
| 1212 gen->rw_space()->object_iterate(&patch); | |
| 1213 | |
| 1214 // Previously method sorting was done concurrently with forwarding | |
| 1215 // pointer resolution in the shared spaces. This imposed an ordering | |
| 1216 // restriction in that methods were required to be promoted/patched | |
| 1217 // before their holder classes. (Because constant pool pointers in | |
| 1218 // methodKlasses are required to be resolved before their holder class | |
| 1219 // is visited for sorting, otherwise methods are sorted by incorrect, | |
| 1220 // pre-forwarding addresses.) | |
| 1221 // | |
| 1222 // Now, we reorder methods as a separate step after ALL forwarding | |
| 1223 // pointer resolution, so that methods can be promoted in any order | |
| 1224 // with respect to their holder classes. | |
| 1225 | |
|
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1226 SortMethodsClosure sort; |
| 0 | 1227 gen->ro_space()->object_iterate(&sort); |
| 1228 gen->rw_space()->object_iterate(&sort); | |
|
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1229 |
|
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1230 ReinitializeTables reinit_tables(THREAD); |
|
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1231 gen->ro_space()->object_iterate(&reinit_tables); |
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1232 gen->rw_space()->object_iterate(&reinit_tables); |
| 0 | 1233 tty->print_cr("done. "); |
| 1234 tty->cr(); | |
| 1235 | |
| 1236 // Reorder the system dictionary. (Moving the symbols opps affects | |
| 1237 // how the hash table indices are calculated.) | |
| 1238 | |
| 1239 SystemDictionary::reorder_dictionary(); | |
| 1240 | |
| 1241 // Empty the non-shared heap (because most of the objects were | |
| 1242 // copied out, and the remainder cannot be considered valid oops). | |
| 1243 | |
| 1244 ClearSpaceClosure csc; | |
| 1245 for (int i = 0; i < gch->n_gens(); ++i) { | |
| 1246 gch->get_gen(i)->space_iterate(&csc); | |
| 1247 } | |
| 1248 csc.do_space(gen->the_space()); | |
| 1249 NOT_PRODUCT(SystemDictionary::verify();) | |
| 1250 | |
| 1251 // Copy the String table, the symbol table, and the system | |
| 1252 // dictionary to the shared space in usable form. Copy the hastable | |
| 1253 // buckets first [read-write], then copy the linked lists of entries | |
| 1254 // [read-only]. | |
| 1255 | |
| 1256 SymbolTable::reverse(extra_symbols); | |
| 1257 NOT_PRODUCT(SymbolTable::verify()); | |
| 1258 SymbolTable::copy_buckets(&md_top, md_end); | |
| 1259 | |
| 1260 StringTable::reverse(); | |
| 1261 NOT_PRODUCT(StringTable::verify()); | |
| 1262 StringTable::copy_buckets(&md_top, md_end); | |
| 1263 | |
| 1264 SystemDictionary::reverse(); | |
| 1265 SystemDictionary::copy_buckets(&md_top, md_end); | |
| 1266 | |
| 1267 ClassLoader::verify(); | |
| 1268 ClassLoader::copy_package_info_buckets(&md_top, md_end); | |
| 1269 ClassLoader::verify(); | |
| 1270 | |
| 1271 SymbolTable::copy_table(&md_top, md_end); | |
| 1272 StringTable::copy_table(&md_top, md_end); | |
| 1273 SystemDictionary::copy_table(&md_top, md_end); | |
| 1274 ClassLoader::verify(); | |
| 1275 ClassLoader::copy_package_info_table(&md_top, md_end); | |
| 1276 ClassLoader::verify(); | |
| 1277 | |
| 1278 // Print debug data. | |
| 1279 | |
| 1280 if (PrintSharedSpaces) { | |
| 1281 const char* fmt = "%s space: " PTR_FORMAT " out of " PTR_FORMAT " bytes allocated at " PTR_FORMAT "."; | |
| 1282 tty->print_cr(fmt, "ro", _ro_space->used(), _ro_space->capacity(), | |
| 1283 _ro_space->bottom()); | |
| 1284 tty->print_cr(fmt, "rw", _rw_space->used(), _rw_space->capacity(), | |
| 1285 _rw_space->bottom()); | |
| 1286 } | |
| 1287 | |
| 1288 // Write the oop data to the output array. | |
| 1289 | |
| 1290 WriteClosure wc(md_top, md_end); | |
| 1291 CompactingPermGenGen::serialize_oops(&wc); | |
| 1292 md_top = wc.get_top(); | |
| 1293 | |
| 1294 // Update the vtable pointers in all of the Klass objects in the | |
| 1295 // heap. They should point to newly generated vtable. | |
| 1296 | |
|
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1297 PatchKlassVtables pkvt; |
| 0 | 1298 _rw_space->object_iterate(&pkvt); |
|
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1299 pkvt.patch(vtbl_list, vtable); |
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1300 |
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1301 #ifndef PRODUCT |
|
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1302 // Update the vtable pointers in all symbols, |
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1303 // but only in non-product builds where symbols DO have virtual methods. |
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1304 PatchSymbolVtables psvt(vtbl_list, vtable); |
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1305 SymbolTable::symbols_do(&psvt); |
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1306 #endif |
| 0 | 1307 |
| 1308 char* saved_vtbl = (char*)malloc(vtbl_list_size * sizeof(void*)); | |
| 1309 memmove(saved_vtbl, vtbl_list, vtbl_list_size * sizeof(void*)); | |
| 1310 memset(vtbl_list, 0, vtbl_list_size * sizeof(void*)); | |
| 1311 | |
| 1312 // Create and write the archive file that maps the shared spaces. | |
| 1313 | |
| 1314 FileMapInfo* mapinfo = new FileMapInfo(); | |
| 1315 mapinfo->populate_header(gch->gen_policy()->max_alignment()); | |
| 1316 | |
| 1317 // Pass 1 - update file offsets in header. | |
| 1318 mapinfo->write_header(); | |
| 1319 mapinfo->write_space(CompactingPermGenGen::ro, _ro_space, true); | |
| 1320 _ro_space->set_saved_mark(); | |
| 1321 mapinfo->write_space(CompactingPermGenGen::rw, _rw_space, false); | |
| 1322 _rw_space->set_saved_mark(); | |
| 1323 mapinfo->write_region(CompactingPermGenGen::md, _md_vs->low(), | |
|
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1324 pointer_delta(md_top, _md_vs->low(), sizeof(char)), |
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1325 SharedMiscDataSize, |
| 0 | 1326 false, false); |
| 1327 mapinfo->write_region(CompactingPermGenGen::mc, _mc_vs->low(), | |
|
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1328 pointer_delta(mc_top, _mc_vs->low(), sizeof(char)), |
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1329 SharedMiscCodeSize, |
| 0 | 1330 true, true); |
| 1331 | |
| 1332 // Pass 2 - write data. | |
| 1333 mapinfo->open_for_write(); | |
| 1334 mapinfo->write_header(); | |
| 1335 mapinfo->write_space(CompactingPermGenGen::ro, _ro_space, true); | |
| 1336 mapinfo->write_space(CompactingPermGenGen::rw, _rw_space, false); | |
| 1337 mapinfo->write_region(CompactingPermGenGen::md, _md_vs->low(), | |
|
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1338 pointer_delta(md_top, _md_vs->low(), sizeof(char)), |
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1339 SharedMiscDataSize, |
| 0 | 1340 false, false); |
| 1341 mapinfo->write_region(CompactingPermGenGen::mc, _mc_vs->low(), | |
|
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1342 pointer_delta(mc_top, _mc_vs->low(), sizeof(char)), |
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1343 SharedMiscCodeSize, |
| 0 | 1344 true, true); |
| 1345 mapinfo->close(); | |
| 1346 | |
| 1347 // Summarize heap. | |
| 1348 memmove(vtbl_list, saved_vtbl, vtbl_list_size * sizeof(void*)); | |
| 1349 print_contents(); | |
| 1350 } | |
| 1351 }; // class VM_PopulateDumpSharedSpace | |
| 1352 | |
| 1353 | |
| 1354 // Populate the shared spaces and dump to a file. | |
| 1355 | |
| 1356 jint CompactingPermGenGen::dump_shared(GrowableArray<oop>* class_promote_order, TRAPS) { | |
| 1357 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 1358 | |
| 1359 // Calculate hash values for all of the (interned) strings to avoid | |
| 1360 // writes to shared pages in the future. | |
| 1361 | |
| 1362 tty->print("Calculating hash values for String objects .. "); | |
| 1363 StringHashCodeClosure shcc(THREAD); | |
| 1364 StringTable::oops_do(&shcc); | |
| 1365 tty->print_cr("done. "); | |
| 1366 | |
| 1367 CompactingPermGenGen* gen = (CompactingPermGenGen*)gch->perm_gen(); | |
| 1368 VM_PopulateDumpSharedSpace op(class_promote_order, | |
| 1369 gen->ro_space(), gen->rw_space(), | |
| 1370 gen->md_space(), gen->mc_space()); | |
| 1371 VMThread::execute(&op); | |
| 1372 return JNI_OK; | |
| 1373 } | |
| 1374 | |
|
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1375 void* CompactingPermGenGen::find_matching_vtbl_ptr(void** vtbl_list, |
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1376 void* new_vtable_start, |
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1377 void* obj) { |
|
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1378 void* old_vtbl_ptr = *(void**)obj; |
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1379 for (int i = 0; i < vtbl_list_size; i++) { |
|
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1380 if (vtbl_list[i] == old_vtbl_ptr) { |
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1381 return (void**)new_vtable_start + i * num_virtuals; |
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1382 } |
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1383 } |
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1384 ShouldNotReachHere(); |
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1385 return NULL; |
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1386 } |
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1387 |
| 0 | 1388 |
| 1389 class LinkClassesClosure : public ObjectClosure { | |
| 1390 private: | |
| 1391 Thread* THREAD; | |
| 1392 | |
| 1393 public: | |
| 1394 LinkClassesClosure(Thread* thread) : THREAD(thread) {} | |
| 1395 | |
| 1396 void do_object(oop obj) { | |
| 1397 if (obj->is_klass()) { | |
| 1398 Klass* k = Klass::cast((klassOop) obj); | |
| 1399 if (k->oop_is_instance()) { | |
| 1400 instanceKlass* ik = (instanceKlass*) k; | |
| 1401 // Link the class to cause the bytecodes to be rewritten and the | |
| 1402 // cpcache to be created. | |
|
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1403 if (ik->init_state() < instanceKlass::linked) { |
| 0 | 1404 ik->link_class(THREAD); |
| 1405 guarantee(!HAS_PENDING_EXCEPTION, "exception in class rewriting"); | |
| 1406 } | |
| 1407 | |
| 1408 // Create String objects from string initializer symbols. | |
| 1409 ik->constants()->resolve_string_constants(THREAD); | |
| 1410 guarantee(!HAS_PENDING_EXCEPTION, "exception resolving string constants"); | |
| 1411 } | |
| 1412 } | |
| 1413 } | |
| 1414 }; | |
| 1415 | |
| 1416 | |
| 1417 // Support for a simple checksum of the contents of the class list | |
| 1418 // file to prevent trivial tampering. The algorithm matches that in | |
| 1419 // the MakeClassList program used by the J2SE build process. | |
| 1420 #define JSUM_SEED ((jlong)CONST64(0xcafebabebabecafe)) | |
| 1421 static jlong | |
| 1422 jsum(jlong start, const char *buf, const int len) | |
| 1423 { | |
| 1424 jlong h = start; | |
| 1425 char *p = (char *)buf, *e = p + len; | |
| 1426 while (p < e) { | |
| 1427 char c = *p++; | |
| 1428 if (c <= ' ') { | |
| 1429 /* Skip spaces and control characters */ | |
| 1430 continue; | |
| 1431 } | |
| 1432 h = 31 * h + c; | |
| 1433 } | |
| 1434 return h; | |
| 1435 } | |
| 1436 | |
| 1437 | |
| 1438 | |
| 1439 | |
| 1440 | |
| 1441 // Preload classes from a list, populate the shared spaces and dump to a | |
| 1442 // file. | |
| 1443 | |
| 1444 void GenCollectedHeap::preload_and_dump(TRAPS) { | |
| 1445 TraceTime timer("Dump Shared Spaces", TraceStartupTime); | |
| 1446 ResourceMark rm; | |
| 1447 | |
| 1448 // Preload classes to be shared. | |
|
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1449 // Should use some os:: method rather than fopen() here. aB. |
| 0 | 1450 // Construct the path to the class list (in jre/lib) |
| 1451 // Walk up two directories from the location of the VM and | |
| 1452 // optionally tack on "lib" (depending on platform) | |
| 1453 char class_list_path[JVM_MAXPATHLEN]; | |
| 1454 os::jvm_path(class_list_path, sizeof(class_list_path)); | |
| 1455 for (int i = 0; i < 3; i++) { | |
| 1456 char *end = strrchr(class_list_path, *os::file_separator()); | |
| 1457 if (end != NULL) *end = '\0'; | |
| 1458 } | |
| 1459 int class_list_path_len = (int)strlen(class_list_path); | |
| 1460 if (class_list_path_len >= 3) { | |
| 1461 if (strcmp(class_list_path + class_list_path_len - 3, "lib") != 0) { | |
| 1462 strcat(class_list_path, os::file_separator()); | |
| 1463 strcat(class_list_path, "lib"); | |
| 1464 } | |
| 1465 } | |
| 1466 strcat(class_list_path, os::file_separator()); | |
| 1467 strcat(class_list_path, "classlist"); | |
| 1468 | |
| 1469 FILE* file = fopen(class_list_path, "r"); | |
| 1470 if (file != NULL) { | |
| 1471 jlong computed_jsum = JSUM_SEED; | |
| 1472 jlong file_jsum = 0; | |
| 1473 | |
| 1474 char class_name[256]; | |
| 1475 int class_count = 0; | |
| 1476 GenCollectedHeap* gch = GenCollectedHeap::heap(); | |
| 1477 gch->_preloading_shared_classes = true; | |
| 1478 GrowableArray<oop>* class_promote_order = new GrowableArray<oop>(); | |
| 1479 | |
| 1480 // Preload (and intern) strings which will be used later. | |
| 1481 | |
| 1482 StringTable::intern("main", THREAD); | |
| 1483 StringTable::intern("([Ljava/lang/String;)V", THREAD); | |
| 1484 StringTable::intern("Ljava/lang/Class;", THREAD); | |
| 1485 | |
| 1486 StringTable::intern("I", THREAD); // Needed for StringBuffer persistence? | |
| 1487 StringTable::intern("Z", THREAD); // Needed for StringBuffer persistence? | |
| 1488 | |
| 1489 // sun.io.Converters | |
| 1490 static const char obj_array_sig[] = "[[Ljava/lang/Object;"; | |
|
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1491 (void)SymbolTable::new_permanent_symbol(obj_array_sig, THREAD); |
| 0 | 1492 |
| 1493 // java.util.HashMap | |
| 1494 static const char map_entry_array_sig[] = "[Ljava/util/Map$Entry;"; | |
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1495 (void)SymbolTable::new_permanent_symbol(map_entry_array_sig, THREAD); |
| 0 | 1496 |
| 1497 tty->print("Loading classes to share ... "); | |
| 1498 while ((fgets(class_name, sizeof class_name, file)) != NULL) { | |
| 1499 if (*class_name == '#') { | |
| 1500 jint fsh, fsl; | |
| 1501 if (sscanf(class_name, "# %8x%8x\n", &fsh, &fsl) == 2) { | |
| 1502 file_jsum = ((jlong)(fsh) << 32) | (fsl & 0xffffffff); | |
| 1503 } | |
| 1504 | |
| 1505 continue; | |
| 1506 } | |
| 1507 // Remove trailing newline | |
| 1508 size_t name_len = strlen(class_name); | |
| 1509 class_name[name_len-1] = '\0'; | |
| 1510 | |
| 1511 computed_jsum = jsum(computed_jsum, class_name, (const int)name_len - 1); | |
| 1512 | |
| 1513 // Got a class name - load it. | |
|
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1514 Symbol* class_name_symbol = SymbolTable::new_permanent_symbol(class_name, THREAD); |
| 0 | 1515 guarantee(!HAS_PENDING_EXCEPTION, "Exception creating a symbol."); |
| 1516 klassOop klass = SystemDictionary::resolve_or_null(class_name_symbol, | |
| 1517 THREAD); | |
| 1518 guarantee(!HAS_PENDING_EXCEPTION, "Exception resolving a class."); | |
| 1519 if (klass != NULL) { | |
| 1520 if (PrintSharedSpaces) { | |
| 1521 tty->print_cr("Shared spaces preloaded: %s", class_name); | |
| 1522 } | |
| 1523 | |
| 1524 | |
| 1525 instanceKlass* ik = instanceKlass::cast(klass); | |
| 1526 | |
| 1527 // Should be class load order as per -XX:+TraceClassLoadingPreorder | |
| 1528 class_promote_order->append(ik->as_klassOop()); | |
| 1529 | |
| 1530 // Link the class to cause the bytecodes to be rewritten and the | |
| 1531 // cpcache to be created. The linking is done as soon as classes | |
| 1532 // are loaded in order that the related data structures (klass, | |
| 1533 // cpCache, Sting constants) are located together. | |
| 1534 | |
|
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1535 if (ik->init_state() < instanceKlass::linked) { |
| 0 | 1536 ik->link_class(THREAD); |
| 1537 guarantee(!(HAS_PENDING_EXCEPTION), "exception in class rewriting"); | |
| 1538 } | |
| 1539 | |
| 1540 // Create String objects from string initializer symbols. | |
| 1541 | |
| 1542 ik->constants()->resolve_string_constants(THREAD); | |
| 1543 | |
| 1544 class_count++; | |
| 1545 } else { | |
| 1546 if (PrintSharedSpaces) { | |
| 1547 tty->cr(); | |
| 1548 tty->print_cr(" Preload failed: %s", class_name); | |
| 1549 } | |
| 1550 } | |
| 1551 file_jsum = 0; // Checksum must be on last line of file | |
| 1552 } | |
| 1553 if (computed_jsum != file_jsum) { | |
| 1554 tty->cr(); | |
| 1555 tty->print_cr("Preload failed: checksum of class list was incorrect."); | |
| 1556 exit(1); | |
| 1557 } | |
| 1558 | |
| 1559 tty->print_cr("done. "); | |
| 1560 | |
| 1561 if (PrintSharedSpaces) { | |
| 1562 tty->print_cr("Shared spaces: preloaded %d classes", class_count); | |
| 1563 } | |
| 1564 | |
| 1565 // Rewrite and unlink classes. | |
| 1566 tty->print("Rewriting and unlinking classes ... "); | |
| 1567 // Make heap parsable | |
| 1568 ensure_parsability(false); // arg is actually don't care | |
| 1569 | |
| 1570 // Link any classes which got missed. (It's not quite clear why | |
| 1571 // they got missed.) This iteration would be unsafe if we weren't | |
| 1572 // single-threaded at this point; however we can't do it on the VM | |
| 1573 // thread because it requires object allocation. | |
| 1574 LinkClassesClosure lcc(Thread::current()); | |
| 1575 object_iterate(&lcc); | |
|
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1576 ensure_parsability(false); // arg is actually don't care |
| 0 | 1577 tty->print_cr("done. "); |
| 1578 | |
| 1579 // Create and dump the shared spaces. | |
| 1580 jint err = CompactingPermGenGen::dump_shared(class_promote_order, THREAD); | |
| 1581 if (err != JNI_OK) { | |
| 1582 fatal("Dumping shared spaces failed."); | |
| 1583 } | |
| 1584 | |
| 1585 } else { | |
| 1586 char errmsg[JVM_MAXPATHLEN]; | |
|
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|
1587 os::lasterror(errmsg, JVM_MAXPATHLEN); |
| 0 | 1588 tty->print_cr("Loading classlist failed: %s", errmsg); |
| 1589 exit(1); | |
| 1590 } | |
| 1591 | |
| 1592 // Since various initialization steps have been undone by this process, | |
| 1593 // it is not reasonable to continue running a java process. | |
| 1594 exit(0); | |
| 1595 } |