332
333 // OLD
334 // Initialize _objectArrayKlass after core bootstraping to make
335 // sure the super class is set up properly for _objectArrayKlass.
336 // ---
337 // NEW
338 // Since some of the old system object arrays have been converted to
339 // ordinary object arrays, _objectArrayKlass will be loaded when
340 // SystemDictionary::initialize(CHECK); is run. See the extra check
341 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
342 _objectArrayKlassObj = InstanceKlass::
343 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
344 // OLD
345 // Add the class to the class hierarchy manually to make sure that
346 // its vtable is initialized after core bootstrapping is completed.
347 // ---
348 // New
349 // Have already been initialized.
350 _objectArrayKlassObj->append_to_sibling_list();
351
352 // Compute is_jdk version flags.
353 // Only 1.3 or later has the java.lang.Shutdown class.
354 // Only 1.4 or later has the java.lang.CharSequence interface.
355 // Only 1.5 or later has the java.lang.management.MemoryUsage class.
356 if (JDK_Version::is_partially_initialized()) {
357 uint8_t jdk_version;
358 Klass* k = SystemDictionary::resolve_or_null(
359 vmSymbols::java_lang_management_MemoryUsage(), THREAD);
360 CLEAR_PENDING_EXCEPTION; // ignore exceptions
361 if (k == NULL) {
362 k = SystemDictionary::resolve_or_null(
363 vmSymbols::java_lang_CharSequence(), THREAD);
364 CLEAR_PENDING_EXCEPTION; // ignore exceptions
365 if (k == NULL) {
366 k = SystemDictionary::resolve_or_null(
367 vmSymbols::java_lang_Shutdown(), THREAD);
368 CLEAR_PENDING_EXCEPTION; // ignore exceptions
369 if (k == NULL) {
370 jdk_version = 2;
371 } else {
372 jdk_version = 3;
373 }
374 } else {
375 jdk_version = 4;
376 }
377 } else {
378 jdk_version = 5;
379 }
380 JDK_Version::fully_initialize(jdk_version);
381 }
382
383 #ifdef ASSERT
384 if (FullGCALot) {
385 // Allocate an array of dummy objects.
386 // We'd like these to be at the bottom of the old generation,
387 // so that when we free one and then collect,
388 // (almost) the whole heap moves
389 // and we find out if we actually update all the oops correctly.
390 // But we can't allocate directly in the old generation,
391 // so we allocate wherever, and hope that the first collection
392 // moves these objects to the bottom of the old generation.
393 // We can allocate directly in the permanent generation, so we do.
394 int size;
395 if (UseConcMarkSweepGC) {
396 warning("Using +FullGCALot with concurrent mark sweep gc "
397 "will not force all objects to relocate");
398 size = FullGCALotDummies;
399 } else {
400 size = FullGCALotDummies * 2;
401 }
402 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
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332
333 // OLD
334 // Initialize _objectArrayKlass after core bootstraping to make
335 // sure the super class is set up properly for _objectArrayKlass.
336 // ---
337 // NEW
338 // Since some of the old system object arrays have been converted to
339 // ordinary object arrays, _objectArrayKlass will be loaded when
340 // SystemDictionary::initialize(CHECK); is run. See the extra check
341 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
342 _objectArrayKlassObj = InstanceKlass::
343 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
344 // OLD
345 // Add the class to the class hierarchy manually to make sure that
346 // its vtable is initialized after core bootstrapping is completed.
347 // ---
348 // New
349 // Have already been initialized.
350 _objectArrayKlassObj->append_to_sibling_list();
351
352 #ifdef ASSERT
353 if (FullGCALot) {
354 // Allocate an array of dummy objects.
355 // We'd like these to be at the bottom of the old generation,
356 // so that when we free one and then collect,
357 // (almost) the whole heap moves
358 // and we find out if we actually update all the oops correctly.
359 // But we can't allocate directly in the old generation,
360 // so we allocate wherever, and hope that the first collection
361 // moves these objects to the bottom of the old generation.
362 // We can allocate directly in the permanent generation, so we do.
363 int size;
364 if (UseConcMarkSweepGC) {
365 warning("Using +FullGCALot with concurrent mark sweep gc "
366 "will not force all objects to relocate");
367 size = FullGCALotDummies;
368 } else {
369 size = FullGCALotDummies * 2;
370 }
371 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
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