universe.cpp revision 1879:f95d63e2154a
168349Sobrien/* 2133359Sobrien * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 3133359Sobrien * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4133359Sobrien * 5133359Sobrien * This code is free software; you can redistribute it and/or modify it 6133359Sobrien * under the terms of the GNU General Public License version 2 only, as 7133359Sobrien * published by the Free Software Foundation. 8133359Sobrien * 9133359Sobrien * This code is distributed in the hope that it will be useful, but WITHOUT 10133359Sobrien * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11133359Sobrien * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12133359Sobrien * version 2 for more details (a copy is included in the LICENSE file that 13133359Sobrien * accompanied this code). 14133359Sobrien * 15133359Sobrien * You should have received a copy of the GNU General Public License version 16133359Sobrien * 2 along with this work; if not, write to the Free Software Foundation, 17133359Sobrien * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18133359Sobrien * 19133359Sobrien * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20133359Sobrien * or visit www.oracle.com if you need additional information or have any 21133359Sobrien * questions. 22133359Sobrien * 23133359Sobrien */ 24133359Sobrien 25133359Sobrien#include "precompiled.hpp" 26133359Sobrien#include "classfile/classLoader.hpp" 27133359Sobrien#include "classfile/javaClasses.hpp" 28133359Sobrien#include "classfile/symbolTable.hpp" 29133359Sobrien#include "classfile/systemDictionary.hpp" 30133359Sobrien#include "classfile/vmSymbols.hpp" 31133359Sobrien#include "code/codeCache.hpp" 32133359Sobrien#include "code/dependencies.hpp" 33133359Sobrien#include "gc_interface/collectedHeap.inline.hpp" 3468349Sobrien#include "interpreter/interpreter.hpp" 3568349Sobrien#include "memory/cardTableModRefBS.hpp" 3668349Sobrien#include "memory/filemap.hpp" 3768349Sobrien#include "memory/gcLocker.inline.hpp" 3868349Sobrien#include "memory/genCollectedHeap.hpp" 3968349Sobrien#include "memory/genRemSet.hpp" 4068349Sobrien#include "memory/generation.hpp" 4168349Sobrien#include "memory/oopFactory.hpp" 4268349Sobrien#include "memory/permGen.hpp" 4368349Sobrien#include "memory/space.hpp" 4468349Sobrien#include "memory/universe.hpp" 45133359Sobrien#include "memory/universe.inline.hpp" 46133359Sobrien#include "oops/arrayKlassKlass.hpp" 4768349Sobrien#include "oops/compiledICHolderKlass.hpp" 4868349Sobrien#include "oops/constMethodKlass.hpp" 4968349Sobrien#include "oops/constantPoolKlass.hpp" 5068349Sobrien#include "oops/constantPoolOop.hpp" 5168349Sobrien#include "oops/cpCacheKlass.hpp" 5268349Sobrien#include "oops/cpCacheOop.hpp" 5368349Sobrien#include "oops/instanceKlass.hpp" 5468349Sobrien#include "oops/instanceKlassKlass.hpp" 5568349Sobrien#include "oops/instanceRefKlass.hpp" 5668349Sobrien#include "oops/klassKlass.hpp" 57133359Sobrien#include "oops/klassOop.hpp" 5868349Sobrien#include "oops/methodDataKlass.hpp" 5968349Sobrien#include "oops/methodKlass.hpp" 6068349Sobrien#include "oops/objArrayKlassKlass.hpp" 6168349Sobrien#include "oops/oop.inline.hpp" 6268349Sobrien#include "oops/symbolKlass.hpp" 6368349Sobrien#include "oops/typeArrayKlass.hpp" 6468349Sobrien#include "oops/typeArrayKlassKlass.hpp" 6568349Sobrien#include "prims/jvmtiRedefineClassesTrace.hpp" 66133359Sobrien#include "runtime/aprofiler.hpp" 67133359Sobrien#include "runtime/arguments.hpp" 68133359Sobrien#include "runtime/deoptimization.hpp" 69133359Sobrien#include "runtime/fprofiler.hpp" 70133359Sobrien#include "runtime/handles.inline.hpp" 71133359Sobrien#include "runtime/init.hpp" 72133359Sobrien#include "runtime/java.hpp" 7368349Sobrien#include "runtime/javaCalls.hpp" 74133359Sobrien#include "runtime/sharedRuntime.hpp" 75133359Sobrien#include "runtime/synchronizer.hpp" 76133359Sobrien#include "runtime/timer.hpp" 7768349Sobrien#include "runtime/vm_operations.hpp" 78133359Sobrien#include "services/memoryService.hpp" 79110949Sobrien#include "utilities/copy.hpp" 8068349Sobrien#include "utilities/events.hpp" 81133359Sobrien#include "utilities/hashtable.inline.hpp" 8268349Sobrien#include "utilities/preserveException.hpp" 8368349Sobrien#ifdef TARGET_OS_FAMILY_linux 84133359Sobrien# include "thread_linux.inline.hpp" 85133359Sobrien#endif 86133359Sobrien#ifdef TARGET_OS_FAMILY_solaris 87133359Sobrien# include "thread_solaris.inline.hpp" 88133359Sobrien#endif 8968349Sobrien#ifdef TARGET_OS_FAMILY_windows 9068349Sobrien# include "thread_windows.inline.hpp" 9168349Sobrien#endif 9268349Sobrien#ifndef SERIALGC 9368349Sobrien#include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" 9468349Sobrien#include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" 9568349Sobrien#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 9668349Sobrien#include "gc_implementation/g1/g1CollectorPolicy.hpp" 9768349Sobrien#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 9868349Sobrien#endif 9968349Sobrien 10068349Sobrien// Known objects 10168349SobrienklassOop Universe::_boolArrayKlassObj = NULL; 10284685SobrienklassOop Universe::_byteArrayKlassObj = NULL; 10384685SobrienklassOop Universe::_charArrayKlassObj = NULL; 10484685SobrienklassOop Universe::_intArrayKlassObj = NULL; 10568349SobrienklassOop Universe::_shortArrayKlassObj = NULL; 10684685SobrienklassOop Universe::_longArrayKlassObj = NULL; 10768349SobrienklassOop Universe::_singleArrayKlassObj = NULL; 10868349SobrienklassOop Universe::_doubleArrayKlassObj = NULL; 109133359SobrienklassOop Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 110133359SobrienklassOop Universe::_objectArrayKlassObj = NULL; 111133359SobrienklassOop Universe::_symbolKlassObj = NULL; 112133359SobrienklassOop Universe::_methodKlassObj = NULL; 11368349SobrienklassOop Universe::_constMethodKlassObj = NULL; 11468349SobrienklassOop Universe::_methodDataKlassObj = NULL; 11568349SobrienklassOop Universe::_klassKlassObj = NULL; 11668349SobrienklassOop Universe::_arrayKlassKlassObj = NULL; 11768349SobrienklassOop Universe::_objArrayKlassKlassObj = NULL; 11868349SobrienklassOop Universe::_typeArrayKlassKlassObj = NULL; 11968349SobrienklassOop Universe::_instanceKlassKlassObj = NULL; 12068349SobrienklassOop Universe::_constantPoolKlassObj = NULL; 12168349SobrienklassOop Universe::_constantPoolCacheKlassObj = NULL; 12268349SobrienklassOop Universe::_compiledICHolderKlassObj = NULL; 12368349SobrienklassOop Universe::_systemObjArrayKlassObj = NULL; 12468349Sobrienoop Universe::_int_mirror = NULL; 12568349Sobrienoop Universe::_float_mirror = NULL; 12668349Sobrienoop Universe::_double_mirror = NULL; 127133359Sobrienoop Universe::_byte_mirror = NULL; 12868349Sobrienoop Universe::_bool_mirror = NULL; 12968349Sobrienoop Universe::_char_mirror = NULL; 13068349Sobrienoop Universe::_long_mirror = NULL; 13168349Sobrienoop Universe::_short_mirror = NULL; 13268349Sobrienoop Universe::_void_mirror = NULL; 13368349Sobrienoop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 13468349Sobrienoop Universe::_main_thread_group = NULL; 13568349Sobrienoop Universe::_system_thread_group = NULL; 13668349SobrientypeArrayOop Universe::_the_empty_byte_array = NULL; 13768349SobrientypeArrayOop Universe::_the_empty_short_array = NULL; 13868349SobrientypeArrayOop Universe::_the_empty_int_array = NULL; 13968349SobrienobjArrayOop Universe::_the_empty_system_obj_array = NULL; 14068349SobrienobjArrayOop Universe::_the_empty_class_klass_array = NULL; 14168349SobrienobjArrayOop Universe::_the_array_interfaces_array = NULL; 14268349Sobrienoop Universe::_the_null_string = NULL; 14368349Sobrienoop Universe::_the_min_jint_string = NULL; 14468349SobrienLatestMethodOopCache* Universe::_finalizer_register_cache = NULL; 14568349SobrienLatestMethodOopCache* Universe::_loader_addClass_cache = NULL; 14668349SobrienActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; 14768349Sobrienoop Universe::_out_of_memory_error_java_heap = NULL; 14868349Sobrienoop Universe::_out_of_memory_error_perm_gen = NULL; 14968349Sobrienoop Universe::_out_of_memory_error_array_size = NULL; 15068349Sobrienoop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 15168349SobrienobjArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 15268349Sobrienvolatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 15368349Sobrienbool Universe::_verify_in_progress = false; 15468349Sobrienoop Universe::_null_ptr_exception_instance = NULL; 15568349Sobrienoop Universe::_arithmetic_exception_instance = NULL; 15668349Sobrienoop Universe::_virtual_machine_error_instance = NULL; 15768349Sobrienoop Universe::_vm_exception = NULL; 15868349Sobrienoop Universe::_emptySymbol = NULL; 15968349Sobrien 16068349Sobrien// These variables are guarded by FullGCALot_lock. 16168349Sobriendebug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 16268349Sobriendebug_only(int Universe::_fullgc_alot_dummy_next = 0;) 16368349Sobrien 16468349Sobrien 16568349Sobrien// Heap 16668349Sobrienint Universe::_verify_count = 0; 16768349Sobrien 16868349Sobrienint Universe::_base_vtable_size = 0; 16968349Sobrienbool Universe::_bootstrapping = false; 17068349Sobrienbool Universe::_fully_initialized = false; 17168349Sobrien 17268349Sobriensize_t Universe::_heap_capacity_at_last_gc; 173133359Sobriensize_t Universe::_heap_used_at_last_gc = 0; 174133359Sobrien 175133359SobrienCollectedHeap* Universe::_collectedHeap = NULL; 176133359Sobrien 17768349SobrienNarrowOopStruct Universe::_narrow_oop = { NULL, 0, true }; 17868349Sobrien 17968349Sobrien 18068349Sobrienvoid Universe::basic_type_classes_do(void f(klassOop)) { 18168349Sobrien f(boolArrayKlassObj()); 18268349Sobrien f(byteArrayKlassObj()); 18368349Sobrien f(charArrayKlassObj()); 18468349Sobrien f(intArrayKlassObj()); 18568349Sobrien f(shortArrayKlassObj()); 18668349Sobrien f(longArrayKlassObj()); 18768349Sobrien f(singleArrayKlassObj()); 18868349Sobrien f(doubleArrayKlassObj()); 18968349Sobrien} 19068349Sobrien 19168349Sobrien 19268349Sobrienvoid Universe::system_classes_do(void f(klassOop)) { 19368349Sobrien f(symbolKlassObj()); 194133359Sobrien f(methodKlassObj()); 19568349Sobrien f(constMethodKlassObj()); 19668349Sobrien f(methodDataKlassObj()); 19768349Sobrien f(klassKlassObj()); 19868349Sobrien f(arrayKlassKlassObj()); 19968349Sobrien f(objArrayKlassKlassObj()); 20068349Sobrien f(typeArrayKlassKlassObj()); 20168349Sobrien f(instanceKlassKlassObj()); 20268349Sobrien f(constantPoolKlassObj()); 20368349Sobrien f(systemObjArrayKlassObj()); 20468349Sobrien} 20568349Sobrien 20668349Sobrienvoid Universe::oops_do(OopClosure* f, bool do_all) { 20768349Sobrien 20868349Sobrien f->do_oop((oop*) &_int_mirror); 20968349Sobrien f->do_oop((oop*) &_float_mirror); 21068349Sobrien f->do_oop((oop*) &_double_mirror); 21168349Sobrien f->do_oop((oop*) &_byte_mirror); 21268349Sobrien f->do_oop((oop*) &_bool_mirror); 21368349Sobrien f->do_oop((oop*) &_char_mirror); 21468349Sobrien f->do_oop((oop*) &_long_mirror); 215133359Sobrien f->do_oop((oop*) &_short_mirror); 216110949Sobrien f->do_oop((oop*) &_void_mirror); 21768349Sobrien 21868349Sobrien // It's important to iterate over these guys even if they are null, 21968349Sobrien // since that's how shared heaps are restored. 22068349Sobrien for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 22168349Sobrien f->do_oop((oop*) &_mirrors[i]); 22268349Sobrien } 22368349Sobrien assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 22468349Sobrien 22568349Sobrien // %%% Consider moving those "shared oops" over here with the others. 22668349Sobrien f->do_oop((oop*)&_boolArrayKlassObj); 22768349Sobrien f->do_oop((oop*)&_byteArrayKlassObj); 22868349Sobrien f->do_oop((oop*)&_charArrayKlassObj); 22968349Sobrien f->do_oop((oop*)&_intArrayKlassObj); 23068349Sobrien f->do_oop((oop*)&_shortArrayKlassObj); 23168349Sobrien f->do_oop((oop*)&_longArrayKlassObj); 23268349Sobrien f->do_oop((oop*)&_singleArrayKlassObj); 23368349Sobrien f->do_oop((oop*)&_doubleArrayKlassObj); 23468349Sobrien f->do_oop((oop*)&_objectArrayKlassObj); 23568349Sobrien { 23668349Sobrien for (int i = 0; i < T_VOID+1; i++) { 23768349Sobrien if (_typeArrayKlassObjs[i] != NULL) { 23868349Sobrien assert(i >= T_BOOLEAN, "checking"); 23968349Sobrien f->do_oop((oop*)&_typeArrayKlassObjs[i]); 24068349Sobrien } else if (do_all) { 24168349Sobrien f->do_oop((oop*)&_typeArrayKlassObjs[i]); 24268349Sobrien } 24368349Sobrien } 24468349Sobrien } 24568349Sobrien f->do_oop((oop*)&_symbolKlassObj); 24668349Sobrien f->do_oop((oop*)&_methodKlassObj); 24768349Sobrien f->do_oop((oop*)&_constMethodKlassObj); 248133359Sobrien f->do_oop((oop*)&_methodDataKlassObj); 24968349Sobrien f->do_oop((oop*)&_klassKlassObj); 25068349Sobrien f->do_oop((oop*)&_arrayKlassKlassObj); 25168349Sobrien f->do_oop((oop*)&_objArrayKlassKlassObj); 25268349Sobrien f->do_oop((oop*)&_typeArrayKlassKlassObj); 25368349Sobrien f->do_oop((oop*)&_instanceKlassKlassObj); 25468349Sobrien f->do_oop((oop*)&_constantPoolKlassObj); 25568349Sobrien f->do_oop((oop*)&_constantPoolCacheKlassObj); 25668349Sobrien f->do_oop((oop*)&_compiledICHolderKlassObj); 25768349Sobrien f->do_oop((oop*)&_systemObjArrayKlassObj); 258133359Sobrien f->do_oop((oop*)&_the_empty_byte_array); 259133359Sobrien f->do_oop((oop*)&_the_empty_short_array); 260133359Sobrien f->do_oop((oop*)&_the_empty_int_array); 261133359Sobrien f->do_oop((oop*)&_the_empty_system_obj_array); 262133359Sobrien f->do_oop((oop*)&_the_empty_class_klass_array); 263133359Sobrien f->do_oop((oop*)&_the_array_interfaces_array); 264133359Sobrien f->do_oop((oop*)&_the_null_string); 265133359Sobrien f->do_oop((oop*)&_the_min_jint_string); 26668349Sobrien _finalizer_register_cache->oops_do(f); 26768349Sobrien _loader_addClass_cache->oops_do(f); 268133359Sobrien _reflect_invoke_cache->oops_do(f); 269133359Sobrien f->do_oop((oop*)&_out_of_memory_error_java_heap); 270133359Sobrien f->do_oop((oop*)&_out_of_memory_error_perm_gen); 271133359Sobrien f->do_oop((oop*)&_out_of_memory_error_array_size); 27268349Sobrien f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 27368349Sobrien if (_preallocated_out_of_memory_error_array != (oop)NULL) { // NULL when DumpSharedSpaces 274133359Sobrien f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 275133359Sobrien } 27668349Sobrien f->do_oop((oop*)&_null_ptr_exception_instance); 27768349Sobrien f->do_oop((oop*)&_arithmetic_exception_instance); 278133359Sobrien f->do_oop((oop*)&_virtual_machine_error_instance); 279133359Sobrien f->do_oop((oop*)&_main_thread_group); 280133359Sobrien f->do_oop((oop*)&_system_thread_group); 281133359Sobrien f->do_oop((oop*)&_vm_exception); 28268349Sobrien f->do_oop((oop*)&_emptySymbol); 28368349Sobrien debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 284133359Sobrien} 285133359Sobrien 286133359Sobrien 287133359Sobrienvoid Universe::check_alignment(uintx size, uintx alignment, const char* name) { 28868349Sobrien if (size < alignment || size % alignment != 0) { 28968349Sobrien ResourceMark rm; 290133359Sobrien stringStream st; 291133359Sobrien st.print("Size of %s (%ld bytes) must be aligned to %ld bytes", name, size, alignment); 29268349Sobrien char* error = st.as_string(); 29368349Sobrien vm_exit_during_initialization(error); 29468349Sobrien } 29568349Sobrien} 29668349Sobrien 29768349Sobrien 29868349Sobrienvoid Universe::genesis(TRAPS) { 299133359Sobrien ResourceMark rm; 300133359Sobrien { FlagSetting fs(_bootstrapping, true); 30168349Sobrien 302133359Sobrien { MutexLocker mc(Compile_lock); 303133359Sobrien 304133359Sobrien // determine base vtable size; without that we cannot create the array klasses 305133359Sobrien compute_base_vtable_size(); 30668349Sobrien 307133359Sobrien if (!UseSharedSpaces) { 308133359Sobrien _klassKlassObj = klassKlass::create_klass(CHECK); 30968349Sobrien _arrayKlassKlassObj = arrayKlassKlass::create_klass(CHECK); 310133359Sobrien 311133359Sobrien _objArrayKlassKlassObj = objArrayKlassKlass::create_klass(CHECK); 31268349Sobrien _instanceKlassKlassObj = instanceKlassKlass::create_klass(CHECK); 31368349Sobrien _typeArrayKlassKlassObj = typeArrayKlassKlass::create_klass(CHECK); 314133359Sobrien 315133359Sobrien _symbolKlassObj = symbolKlass::create_klass(CHECK); 31668349Sobrien 317133359Sobrien _emptySymbol = oopFactory::new_symbol("", CHECK); 318133359Sobrien 31968349Sobrien _boolArrayKlassObj = typeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 32068349Sobrien _charArrayKlassObj = typeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 321133359Sobrien _singleArrayKlassObj = typeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 322133359Sobrien _doubleArrayKlassObj = typeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 32368349Sobrien _byteArrayKlassObj = typeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 324133359Sobrien _shortArrayKlassObj = typeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 325133359Sobrien _intArrayKlassObj = typeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 32668349Sobrien _longArrayKlassObj = typeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 32768349Sobrien 328133359Sobrien _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 329133359Sobrien _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 33068349Sobrien _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 33168349Sobrien _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 332133359Sobrien _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 333133359Sobrien _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 33468349Sobrien _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 33568349Sobrien _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 33668349Sobrien 337133359Sobrien _methodKlassObj = methodKlass::create_klass(CHECK); 338133359Sobrien _constMethodKlassObj = constMethodKlass::create_klass(CHECK); 33968349Sobrien _methodDataKlassObj = methodDataKlass::create_klass(CHECK); 340133359Sobrien _constantPoolKlassObj = constantPoolKlass::create_klass(CHECK); 341133359Sobrien _constantPoolCacheKlassObj = constantPoolCacheKlass::create_klass(CHECK); 34268349Sobrien 34368349Sobrien _compiledICHolderKlassObj = compiledICHolderKlass::create_klass(CHECK); 34468349Sobrien _systemObjArrayKlassObj = objArrayKlassKlass::cast(objArrayKlassKlassObj())->allocate_system_objArray_klass(CHECK); 34568349Sobrien 34668349Sobrien _the_empty_byte_array = oopFactory::new_permanent_byteArray(0, CHECK); 347133359Sobrien _the_empty_short_array = oopFactory::new_permanent_shortArray(0, CHECK); 348133359Sobrien _the_empty_int_array = oopFactory::new_permanent_intArray(0, CHECK); 34968349Sobrien _the_empty_system_obj_array = oopFactory::new_system_objArray(0, CHECK); 35068349Sobrien 35168349Sobrien _the_array_interfaces_array = oopFactory::new_system_objArray(2, CHECK); 35268349Sobrien _vm_exception = oopFactory::new_symbol("vm exception holder", CHECK); 35368349Sobrien } else { 35468349Sobrien FileMapInfo *mapinfo = FileMapInfo::current_info(); 35568349Sobrien char* buffer = mapinfo->region_base(CompactingPermGenGen::md); 35668349Sobrien void** vtbl_list = (void**)buffer; 35768349Sobrien init_self_patching_vtbl_list(vtbl_list, 35868349Sobrien CompactingPermGenGen::vtbl_list_size); 35968349Sobrien } 36068349Sobrien } 36168349Sobrien 36268349Sobrien vmSymbols::initialize(CHECK); 36368349Sobrien 36468349Sobrien SystemDictionary::initialize(CHECK); 36568349Sobrien 36668349Sobrien klassOop ok = SystemDictionary::Object_klass(); 36768349Sobrien 36868349Sobrien _the_null_string = StringTable::intern("null", CHECK); 36968349Sobrien _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 37068349Sobrien 37168349Sobrien if (UseSharedSpaces) { 37268349Sobrien // Verify shared interfaces array. 37368349Sobrien assert(_the_array_interfaces_array->obj_at(0) == 37468349Sobrien SystemDictionary::Cloneable_klass(), "u3"); 37568349Sobrien assert(_the_array_interfaces_array->obj_at(1) == 37668349Sobrien SystemDictionary::Serializable_klass(), "u3"); 37768349Sobrien 37868349Sobrien // Verify element klass for system obj array klass 37968349Sobrien assert(objArrayKlass::cast(_systemObjArrayKlassObj)->element_klass() == ok, "u1"); 38068349Sobrien assert(objArrayKlass::cast(_systemObjArrayKlassObj)->bottom_klass() == ok, "u2"); 38168349Sobrien 38268349Sobrien // Verify super class for the classes created above 38368349Sobrien assert(Klass::cast(boolArrayKlassObj() )->super() == ok, "u3"); 38468349Sobrien assert(Klass::cast(charArrayKlassObj() )->super() == ok, "u3"); 38568349Sobrien assert(Klass::cast(singleArrayKlassObj() )->super() == ok, "u3"); 38668349Sobrien assert(Klass::cast(doubleArrayKlassObj() )->super() == ok, "u3"); 38768349Sobrien assert(Klass::cast(byteArrayKlassObj() )->super() == ok, "u3"); 38868349Sobrien assert(Klass::cast(shortArrayKlassObj() )->super() == ok, "u3"); 38968349Sobrien assert(Klass::cast(intArrayKlassObj() )->super() == ok, "u3"); 39068349Sobrien assert(Klass::cast(longArrayKlassObj() )->super() == ok, "u3"); 39168349Sobrien assert(Klass::cast(constantPoolKlassObj() )->super() == ok, "u3"); 39268349Sobrien assert(Klass::cast(systemObjArrayKlassObj())->super() == ok, "u3"); 39368349Sobrien } else { 39468349Sobrien // Set up shared interfaces array. (Do this before supers are set up.) 39568349Sobrien _the_array_interfaces_array->obj_at_put(0, SystemDictionary::Cloneable_klass()); 39668349Sobrien _the_array_interfaces_array->obj_at_put(1, SystemDictionary::Serializable_klass()); 39768349Sobrien 39868349Sobrien // Set element klass for system obj array klass 39968349Sobrien objArrayKlass::cast(_systemObjArrayKlassObj)->set_element_klass(ok); 40068349Sobrien objArrayKlass::cast(_systemObjArrayKlassObj)->set_bottom_klass(ok); 40168349Sobrien 40268349Sobrien // Set super class for the classes created above 40368349Sobrien Klass::cast(boolArrayKlassObj() )->initialize_supers(ok, CHECK); 40468349Sobrien Klass::cast(charArrayKlassObj() )->initialize_supers(ok, CHECK); 40568349Sobrien Klass::cast(singleArrayKlassObj() )->initialize_supers(ok, CHECK); 40668349Sobrien Klass::cast(doubleArrayKlassObj() )->initialize_supers(ok, CHECK); 40768349Sobrien Klass::cast(byteArrayKlassObj() )->initialize_supers(ok, CHECK); 40868349Sobrien Klass::cast(shortArrayKlassObj() )->initialize_supers(ok, CHECK); 40968349Sobrien Klass::cast(intArrayKlassObj() )->initialize_supers(ok, CHECK); 41068349Sobrien Klass::cast(longArrayKlassObj() )->initialize_supers(ok, CHECK); 41168349Sobrien Klass::cast(constantPoolKlassObj() )->initialize_supers(ok, CHECK); 41268349Sobrien Klass::cast(systemObjArrayKlassObj())->initialize_supers(ok, CHECK); 41368349Sobrien Klass::cast(boolArrayKlassObj() )->set_super(ok); 41468349Sobrien Klass::cast(charArrayKlassObj() )->set_super(ok); 41568349Sobrien Klass::cast(singleArrayKlassObj() )->set_super(ok); 41668349Sobrien Klass::cast(doubleArrayKlassObj() )->set_super(ok); 41768349Sobrien Klass::cast(byteArrayKlassObj() )->set_super(ok); 41868349Sobrien Klass::cast(shortArrayKlassObj() )->set_super(ok); 41968349Sobrien Klass::cast(intArrayKlassObj() )->set_super(ok); 420133359Sobrien Klass::cast(longArrayKlassObj() )->set_super(ok); 42168349Sobrien Klass::cast(constantPoolKlassObj() )->set_super(ok); 42268349Sobrien Klass::cast(systemObjArrayKlassObj())->set_super(ok); 42368349Sobrien } 42468349Sobrien 42568349Sobrien Klass::cast(boolArrayKlassObj() )->append_to_sibling_list(); 42668349Sobrien Klass::cast(charArrayKlassObj() )->append_to_sibling_list(); 42768349Sobrien Klass::cast(singleArrayKlassObj() )->append_to_sibling_list(); 42868349Sobrien Klass::cast(doubleArrayKlassObj() )->append_to_sibling_list(); 42968349Sobrien Klass::cast(byteArrayKlassObj() )->append_to_sibling_list(); 43068349Sobrien Klass::cast(shortArrayKlassObj() )->append_to_sibling_list(); 43168349Sobrien Klass::cast(intArrayKlassObj() )->append_to_sibling_list(); 43268349Sobrien Klass::cast(longArrayKlassObj() )->append_to_sibling_list(); 43368349Sobrien Klass::cast(constantPoolKlassObj() )->append_to_sibling_list(); 43468349Sobrien Klass::cast(systemObjArrayKlassObj())->append_to_sibling_list(); 43568349Sobrien } // end of core bootstrapping 43668349Sobrien 43768349Sobrien // Initialize _objectArrayKlass after core bootstraping to make 43868349Sobrien // sure the super class is set up properly for _objectArrayKlass. 43968349Sobrien _objectArrayKlassObj = instanceKlass:: 44068349Sobrien cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 44168349Sobrien // Add the class to the class hierarchy manually to make sure that 442133359Sobrien // its vtable is initialized after core bootstrapping is completed. 443133359Sobrien Klass::cast(_objectArrayKlassObj)->append_to_sibling_list(); 444133359Sobrien 44568349Sobrien // Compute is_jdk version flags. 44668349Sobrien // Only 1.3 or later has the java.lang.Shutdown class. 44768349Sobrien // Only 1.4 or later has the java.lang.CharSequence interface. 44868349Sobrien // Only 1.5 or later has the java.lang.management.MemoryUsage class. 44968349Sobrien if (JDK_Version::is_partially_initialized()) { 45068349Sobrien uint8_t jdk_version; 45168349Sobrien klassOop k = SystemDictionary::resolve_or_null( 45268349Sobrien vmSymbolHandles::java_lang_management_MemoryUsage(), THREAD); 45368349Sobrien CLEAR_PENDING_EXCEPTION; // ignore exceptions 45468349Sobrien if (k == NULL) { 45568349Sobrien k = SystemDictionary::resolve_or_null( 45668349Sobrien vmSymbolHandles::java_lang_CharSequence(), THREAD); 45768349Sobrien CLEAR_PENDING_EXCEPTION; // ignore exceptions 45868349Sobrien if (k == NULL) { 45968349Sobrien k = SystemDictionary::resolve_or_null( 46068349Sobrien vmSymbolHandles::java_lang_Shutdown(), THREAD); 46168349Sobrien CLEAR_PENDING_EXCEPTION; // ignore exceptions 462133359Sobrien if (k == NULL) { 463133359Sobrien jdk_version = 2; 46468349Sobrien } else { 46568349Sobrien jdk_version = 3; 46668349Sobrien } 46768349Sobrien } else { 46868349Sobrien jdk_version = 4; 46968349Sobrien } 47068349Sobrien } else { 47168349Sobrien jdk_version = 5; 47268349Sobrien } 47368349Sobrien JDK_Version::fully_initialize(jdk_version); 47468349Sobrien } 47568349Sobrien 47668349Sobrien #ifdef ASSERT 47768349Sobrien if (FullGCALot) { 47868349Sobrien // Allocate an array of dummy objects. 47968349Sobrien // We'd like these to be at the bottom of the old generation, 48068349Sobrien // so that when we free one and then collect, 481133359Sobrien // (almost) the whole heap moves 482133359Sobrien // and we find out if we actually update all the oops correctly. 483133359Sobrien // But we can't allocate directly in the old generation, 48468349Sobrien // so we allocate wherever, and hope that the first collection 48568349Sobrien // moves these objects to the bottom of the old generation. 48668349Sobrien // We can allocate directly in the permanent generation, so we do. 48768349Sobrien int size; 48868349Sobrien if (UseConcMarkSweepGC) { 48968349Sobrien warning("Using +FullGCALot with concurrent mark sweep gc " 49068349Sobrien "will not force all objects to relocate"); 49168349Sobrien size = FullGCALotDummies; 49268349Sobrien } else { 49368349Sobrien size = FullGCALotDummies * 2; 49468349Sobrien } 49568349Sobrien objArrayOop naked_array = oopFactory::new_system_objArray(size, CHECK); 49668349Sobrien objArrayHandle dummy_array(THREAD, naked_array); 49768349Sobrien int i = 0; 49868349Sobrien while (i < size) { 49968349Sobrien if (!UseConcMarkSweepGC) { 50068349Sobrien // Allocate dummy in old generation 501133359Sobrien oop dummy = instanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 502133359Sobrien dummy_array->obj_at_put(i++, dummy); 50368349Sobrien } 50468349Sobrien // Allocate dummy in permanent generation 50568349Sobrien oop dummy = instanceKlass::cast(SystemDictionary::Object_klass())->allocate_permanent_instance(CHECK); 50668349Sobrien dummy_array->obj_at_put(i++, dummy); 50768349Sobrien } 50868349Sobrien { 50968349Sobrien // Only modify the global variable inside the mutex. 51068349Sobrien // If we had a race to here, the other dummy_array instances 51168349Sobrien // and their elements just get dropped on the floor, which is fine. 51268349Sobrien MutexLocker ml(FullGCALot_lock); 51368349Sobrien if (_fullgc_alot_dummy_array == NULL) { 51468349Sobrien _fullgc_alot_dummy_array = dummy_array(); 51568349Sobrien } 51668349Sobrien } 51768349Sobrien assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 51868349Sobrien } 51968349Sobrien #endif 52068349Sobrien} 52168349Sobrien 52268349Sobrien 52368349Sobrienstatic inline void add_vtable(void** list, int* n, Klass* o, int count) { 52468349Sobrien list[(*n)++] = *(void**)&o->vtbl_value(); 52568349Sobrien guarantee((*n) <= count, "vtable list too small."); 52668349Sobrien} 52768349Sobrien 52868349Sobrien 52968349Sobrienvoid Universe::init_self_patching_vtbl_list(void** list, int count) { 53068349Sobrien int n = 0; 53168349Sobrien { klassKlass o; add_vtable(list, &n, &o, count); } 53268349Sobrien { arrayKlassKlass o; add_vtable(list, &n, &o, count); } 53368349Sobrien { objArrayKlassKlass o; add_vtable(list, &n, &o, count); } 53468349Sobrien { instanceKlassKlass o; add_vtable(list, &n, &o, count); } 53568349Sobrien { instanceKlass o; add_vtable(list, &n, &o, count); } 53668349Sobrien { instanceRefKlass o; add_vtable(list, &n, &o, count); } 53768349Sobrien { typeArrayKlassKlass o; add_vtable(list, &n, &o, count); } 53868349Sobrien { symbolKlass o; add_vtable(list, &n, &o, count); } 53968349Sobrien { typeArrayKlass o; add_vtable(list, &n, &o, count); } 54068349Sobrien { methodKlass o; add_vtable(list, &n, &o, count); } 54168349Sobrien { constMethodKlass o; add_vtable(list, &n, &o, count); } 54268349Sobrien { constantPoolKlass o; add_vtable(list, &n, &o, count); } 54368349Sobrien { constantPoolCacheKlass o; add_vtable(list, &n, &o, count); } 54468349Sobrien { objArrayKlass o; add_vtable(list, &n, &o, count); } 54568349Sobrien { methodDataKlass o; add_vtable(list, &n, &o, count); } 54668349Sobrien { compiledICHolderKlass o; add_vtable(list, &n, &o, count); } 54768349Sobrien} 54868349Sobrien 54968349Sobrien 55068349Sobrienclass FixupMirrorClosure: public ObjectClosure { 55168349Sobrien public: 55268349Sobrien virtual void do_object(oop obj) { 55368349Sobrien if (obj->is_klass()) { 55468349Sobrien EXCEPTION_MARK; 55568349Sobrien KlassHandle k(THREAD, klassOop(obj)); 55668349Sobrien // We will never reach the CATCH below since Exceptions::_throw will cause 55768349Sobrien // the VM to exit if an exception is thrown during initialization 55868349Sobrien java_lang_Class::create_mirror(k, CATCH); 55968349Sobrien // This call unconditionally creates a new mirror for k, 56068349Sobrien // and links in k's component_mirror field if k is an array. 56168349Sobrien // If k is an objArray, k's element type must already have 56268349Sobrien // a mirror. In other words, this closure must process 563133359Sobrien // the component type of an objArray k before it processes k. 564133359Sobrien // This works because the permgen iterator presents arrays 565133359Sobrien // and their component types in order of creation. 56668349Sobrien } 56768349Sobrien } 56868349Sobrien}; 56968349Sobrien 57068349Sobrienvoid Universe::initialize_basic_type_mirrors(TRAPS) { 57168349Sobrien if (UseSharedSpaces) { 57268349Sobrien assert(_int_mirror != NULL, "already loaded"); 57368349Sobrien assert(_void_mirror == _mirrors[T_VOID], "consistently loaded"); 57468349Sobrien } else { 57568349Sobrien 57668349Sobrien assert(_int_mirror==NULL, "basic type mirrors already initialized"); 57768349Sobrien _int_mirror = 57868349Sobrien java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 57968349Sobrien _float_mirror = 58068349Sobrien java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 58168349Sobrien _double_mirror = 58268349Sobrien java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 58368349Sobrien _byte_mirror = 58468349Sobrien java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 58568349Sobrien _bool_mirror = 58668349Sobrien java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 58768349Sobrien _char_mirror = 58868349Sobrien java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 58968349Sobrien _long_mirror = 59068349Sobrien java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 59168349Sobrien _short_mirror = 592133359Sobrien java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 593133359Sobrien _void_mirror = 59468349Sobrien java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 59568349Sobrien 59668349Sobrien _mirrors[T_INT] = _int_mirror; 597110949Sobrien _mirrors[T_FLOAT] = _float_mirror; 59868349Sobrien _mirrors[T_DOUBLE] = _double_mirror; 59968349Sobrien _mirrors[T_BYTE] = _byte_mirror; 60068349Sobrien _mirrors[T_BOOLEAN] = _bool_mirror; 60168349Sobrien _mirrors[T_CHAR] = _char_mirror; 60268349Sobrien _mirrors[T_LONG] = _long_mirror; 60368349Sobrien _mirrors[T_SHORT] = _short_mirror; 60468349Sobrien _mirrors[T_VOID] = _void_mirror; 60568349Sobrien //_mirrors[T_OBJECT] = instanceKlass::cast(_object_klass)->java_mirror(); 60668349Sobrien //_mirrors[T_ARRAY] = instanceKlass::cast(_object_klass)->java_mirror(); 60768349Sobrien } 60868349Sobrien} 60968349Sobrien 61068349Sobrienvoid Universe::fixup_mirrors(TRAPS) { 61168349Sobrien // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 61268349Sobrien // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 61368349Sobrien // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 61468349Sobrien // that the number of objects allocated at this point is very small. 61568349Sobrien assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 61668349Sobrien FixupMirrorClosure blk; 61768349Sobrien Universe::heap()->permanent_object_iterate(&blk); 61868349Sobrien} 61968349Sobrien 62068349Sobrien 62168349Sobrienstatic bool has_run_finalizers_on_exit = false; 62268349Sobrien 62368349Sobrienvoid Universe::run_finalizers_on_exit() { 62468349Sobrien if (has_run_finalizers_on_exit) return; 62568349Sobrien has_run_finalizers_on_exit = true; 62668349Sobrien 627133359Sobrien // Called on VM exit. This ought to be run in a separate thread. 62868349Sobrien if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 62968349Sobrien { 63068349Sobrien PRESERVE_EXCEPTION_MARK; 63168349Sobrien KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 63268349Sobrien JavaValue result(T_VOID); 63368349Sobrien JavaCalls::call_static( 63468349Sobrien &result, 63568349Sobrien finalizer_klass, 63668349Sobrien vmSymbolHandles::run_finalizers_on_exit_name(), 63768349Sobrien vmSymbolHandles::void_method_signature(), 63868349Sobrien THREAD 63968349Sobrien ); 64068349Sobrien // Ignore any pending exceptions 64168349Sobrien CLEAR_PENDING_EXCEPTION; 64268349Sobrien } 64368349Sobrien} 64468349Sobrien 64568349Sobrien 646133359Sobrien// initialize_vtable could cause gc if 64768349Sobrien// 1) we specified true to initialize_vtable and 64868349Sobrien// 2) this ran after gc was enabled 64968349Sobrien// In case those ever change we use handles for oops 65068349Sobrienvoid Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 65168349Sobrien // init vtable of k and all subclasses 65268349Sobrien Klass* ko = k_h()->klass_part(); 65368349Sobrien klassVtable* vt = ko->vtable(); 65468349Sobrien if (vt) vt->initialize_vtable(false, CHECK); 65568349Sobrien if (ko->oop_is_instance()) { 65668349Sobrien instanceKlass* ik = (instanceKlass*)ko; 65768349Sobrien for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->klass_part()->next_sibling())) { 65868349Sobrien reinitialize_vtable_of(s_h, CHECK); 65968349Sobrien } 66068349Sobrien } 661133359Sobrien} 66268349Sobrien 66368349Sobrien 66468349Sobrienvoid initialize_itable_for_klass(klassOop k, TRAPS) { 66568349Sobrien instanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 66668349Sobrien} 66768349Sobrien 66868349Sobrien 66968349Sobrienvoid Universe::reinitialize_itables(TRAPS) { 67068349Sobrien SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 67168349Sobrien 67268349Sobrien} 67368349Sobrien 67468349Sobrien 67568349Sobrienbool Universe::on_page_boundary(void* addr) { 67668349Sobrien return ((uintptr_t) addr) % os::vm_page_size() == 0; 67768349Sobrien} 67868349Sobrien 679133359Sobrien 68068349Sobrienbool Universe::should_fill_in_stack_trace(Handle throwable) { 68168349Sobrien // never attempt to fill in the stack trace of preallocated errors that do not have 68268349Sobrien // backtrace. These errors are kept alive forever and may be "re-used" when all 68368349Sobrien // preallocated errors with backtrace have been consumed. Also need to avoid 684133359Sobrien // a potential loop which could happen if an out of memory occurs when attempting 685133359Sobrien // to allocate the backtrace. 68668349Sobrien return ((throwable() != Universe::_out_of_memory_error_java_heap) && 68768349Sobrien (throwable() != Universe::_out_of_memory_error_perm_gen) && 68868349Sobrien (throwable() != Universe::_out_of_memory_error_array_size) && 68968349Sobrien (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); 69068349Sobrien} 69168349Sobrien 69268349Sobrien 693oop Universe::gen_out_of_memory_error(oop default_err) { 694 // generate an out of memory error: 695 // - if there is a preallocated error with backtrace available then return it wth 696 // a filled in stack trace. 697 // - if there are no preallocated errors with backtrace available then return 698 // an error without backtrace. 699 int next; 700 if (_preallocated_out_of_memory_error_avail_count > 0) { 701 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 702 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 703 } else { 704 next = -1; 705 } 706 if (next < 0) { 707 // all preallocated errors have been used. 708 // return default 709 return default_err; 710 } else { 711 // get the error object at the slot and set set it to NULL so that the 712 // array isn't keeping it alive anymore. 713 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 714 assert(exc != NULL, "slot has been used already"); 715 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 716 717 // use the message from the default error 718 oop msg = java_lang_Throwable::message(default_err); 719 assert(msg != NULL, "no message"); 720 java_lang_Throwable::set_message(exc, msg); 721 722 // populate the stack trace and return it. 723 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 724 return exc; 725 } 726} 727 728static intptr_t non_oop_bits = 0; 729 730void* Universe::non_oop_word() { 731 // Neither the high bits nor the low bits of this value is allowed 732 // to look like (respectively) the high or low bits of a real oop. 733 // 734 // High and low are CPU-specific notions, but low always includes 735 // the low-order bit. Since oops are always aligned at least mod 4, 736 // setting the low-order bit will ensure that the low half of the 737 // word will never look like that of a real oop. 738 // 739 // Using the OS-supplied non-memory-address word (usually 0 or -1) 740 // will take care of the high bits, however many there are. 741 742 if (non_oop_bits == 0) { 743 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 744 } 745 746 return (void*)non_oop_bits; 747} 748 749jint universe_init() { 750 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 751 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 752 "LogHeapWordSize is incorrect."); 753 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 754 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 755 "oop size is not not a multiple of HeapWord size"); 756 TraceTime timer("Genesis", TraceStartupTime); 757 GC_locker::lock(); // do not allow gc during bootstrapping 758 JavaClasses::compute_hard_coded_offsets(); 759 760 // Get map info from shared archive file. 761 if (DumpSharedSpaces) 762 UseSharedSpaces = false; 763 764 FileMapInfo* mapinfo = NULL; 765 if (UseSharedSpaces) { 766 mapinfo = NEW_C_HEAP_OBJ(FileMapInfo); 767 memset(mapinfo, 0, sizeof(FileMapInfo)); 768 769 // Open the shared archive file, read and validate the header. If 770 // initialization files, shared spaces [UseSharedSpaces] are 771 // disabled and the file is closed. 772 773 if (mapinfo->initialize()) { 774 FileMapInfo::set_current_info(mapinfo); 775 } else { 776 assert(!mapinfo->is_open() && !UseSharedSpaces, 777 "archive file not closed or shared spaces not disabled."); 778 } 779 } 780 781 jint status = Universe::initialize_heap(); 782 if (status != JNI_OK) { 783 return status; 784 } 785 786 // We have a heap so create the methodOop caches before 787 // CompactingPermGenGen::initialize_oops() tries to populate them. 788 Universe::_finalizer_register_cache = new LatestMethodOopCache(); 789 Universe::_loader_addClass_cache = new LatestMethodOopCache(); 790 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); 791 792 if (UseSharedSpaces) { 793 794 // Read the data structures supporting the shared spaces (shared 795 // system dictionary, symbol table, etc.). After that, access to 796 // the file (other than the mapped regions) is no longer needed, and 797 // the file is closed. Closing the file does not affect the 798 // currently mapped regions. 799 800 CompactingPermGenGen::initialize_oops(); 801 mapinfo->close(); 802 803 } else { 804 SymbolTable::create_table(); 805 StringTable::create_table(); 806 ClassLoader::create_package_info_table(); 807 } 808 809 return JNI_OK; 810} 811 812// Choose the heap base address and oop encoding mode 813// when compressed oops are used: 814// Unscaled - Use 32-bits oops without encoding when 815// NarrowOopHeapBaseMin + heap_size < 4Gb 816// ZeroBased - Use zero based compressed oops with encoding when 817// NarrowOopHeapBaseMin + heap_size < 32Gb 818// HeapBased - Use compressed oops with heap base + encoding. 819 820// 4Gb 821static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); 822// 32Gb 823// OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; 824 825char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { 826 size_t base = 0; 827#ifdef _LP64 828 if (UseCompressedOops) { 829 assert(mode == UnscaledNarrowOop || 830 mode == ZeroBasedNarrowOop || 831 mode == HeapBasedNarrowOop, "mode is invalid"); 832 const size_t total_size = heap_size + HeapBaseMinAddress; 833 // Return specified base for the first request. 834 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 835 base = HeapBaseMinAddress; 836 } else if (total_size <= OopEncodingHeapMax && (mode != HeapBasedNarrowOop)) { 837 if (total_size <= NarrowOopHeapMax && (mode == UnscaledNarrowOop) && 838 (Universe::narrow_oop_shift() == 0)) { 839 // Use 32-bits oops without encoding and 840 // place heap's top on the 4Gb boundary 841 base = (NarrowOopHeapMax - heap_size); 842 } else { 843 // Can't reserve with NarrowOopShift == 0 844 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 845 if (mode == UnscaledNarrowOop || 846 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { 847 // Use zero based compressed oops with encoding and 848 // place heap's top on the 32Gb boundary in case 849 // total_size > 4Gb or failed to reserve below 4Gb. 850 base = (OopEncodingHeapMax - heap_size); 851 } 852 } 853 } else { 854 // Can't reserve below 32Gb. 855 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 856 } 857 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 858 // used in ReservedHeapSpace() constructors. 859 // The final values will be set in initialize_heap() below. 860 if (base != 0 && (base + heap_size) <= OopEncodingHeapMax) { 861 // Use zero based compressed oops 862 Universe::set_narrow_oop_base(NULL); 863 // Don't need guard page for implicit checks in indexed 864 // addressing mode with zero based Compressed Oops. 865 Universe::set_narrow_oop_use_implicit_null_checks(true); 866 } else { 867 // Set to a non-NULL value so the ReservedSpace ctor computes 868 // the correct no-access prefix. 869 // The final value will be set in initialize_heap() below. 870 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); 871#ifdef _WIN64 872 if (UseLargePages) { 873 // Cannot allocate guard pages for implicit checks in indexed 874 // addressing mode when large pages are specified on windows. 875 Universe::set_narrow_oop_use_implicit_null_checks(false); 876 } 877#endif // _WIN64 878 } 879 } 880#endif 881 return (char*)base; // also return NULL (don't care) for 32-bit VM 882} 883 884jint Universe::initialize_heap() { 885 886 if (UseParallelGC) { 887#ifndef SERIALGC 888 Universe::_collectedHeap = new ParallelScavengeHeap(); 889#else // SERIALGC 890 fatal("UseParallelGC not supported in java kernel vm."); 891#endif // SERIALGC 892 893 } else if (UseG1GC) { 894#ifndef SERIALGC 895 G1CollectorPolicy* g1p = new G1CollectorPolicy_BestRegionsFirst(); 896 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 897 Universe::_collectedHeap = g1h; 898#else // SERIALGC 899 fatal("UseG1GC not supported in java kernel vm."); 900#endif // SERIALGC 901 902 } else { 903 GenCollectorPolicy *gc_policy; 904 905 if (UseSerialGC) { 906 gc_policy = new MarkSweepPolicy(); 907 } else if (UseConcMarkSweepGC) { 908#ifndef SERIALGC 909 if (UseAdaptiveSizePolicy) { 910 gc_policy = new ASConcurrentMarkSweepPolicy(); 911 } else { 912 gc_policy = new ConcurrentMarkSweepPolicy(); 913 } 914#else // SERIALGC 915 fatal("UseConcMarkSweepGC not supported in java kernel vm."); 916#endif // SERIALGC 917 } else { // default old generation 918 gc_policy = new MarkSweepPolicy(); 919 } 920 921 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 922 } 923 924 jint status = Universe::heap()->initialize(); 925 if (status != JNI_OK) { 926 return status; 927 } 928 929#ifdef _LP64 930 if (UseCompressedOops) { 931 // Subtract a page because something can get allocated at heap base. 932 // This also makes implicit null checking work, because the 933 // memory+1 page below heap_base needs to cause a signal. 934 // See needs_explicit_null_check. 935 // Only set the heap base for compressed oops because it indicates 936 // compressed oops for pstack code. 937 if (PrintCompressedOopsMode) { 938 tty->cr(); 939 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 940 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); 941 } 942 if ((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) { 943 // Can't reserve heap below 32Gb. 944 Universe::set_narrow_oop_base(Universe::heap()->base() - os::vm_page_size()); 945 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 946 if (PrintCompressedOopsMode) { 947 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); 948 } 949 } else { 950 Universe::set_narrow_oop_base(0); 951 if (PrintCompressedOopsMode) { 952 tty->print(", zero based Compressed Oops"); 953 } 954#ifdef _WIN64 955 if (!Universe::narrow_oop_use_implicit_null_checks()) { 956 // Don't need guard page for implicit checks in indexed addressing 957 // mode with zero based Compressed Oops. 958 Universe::set_narrow_oop_use_implicit_null_checks(true); 959 } 960#endif // _WIN64 961 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { 962 // Can't reserve heap below 4Gb. 963 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 964 } else { 965 Universe::set_narrow_oop_shift(0); 966 if (PrintCompressedOopsMode) { 967 tty->print(", 32-bits Oops"); 968 } 969 } 970 } 971 if (PrintCompressedOopsMode) { 972 tty->cr(); 973 tty->cr(); 974 } 975 } 976 assert(Universe::narrow_oop_base() == (Universe::heap()->base() - os::vm_page_size()) || 977 Universe::narrow_oop_base() == NULL, "invalid value"); 978 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 979 Universe::narrow_oop_shift() == 0, "invalid value"); 980#endif 981 982 // We will never reach the CATCH below since Exceptions::_throw will cause 983 // the VM to exit if an exception is thrown during initialization 984 985 if (UseTLAB) { 986 assert(Universe::heap()->supports_tlab_allocation(), 987 "Should support thread-local allocation buffers"); 988 ThreadLocalAllocBuffer::startup_initialization(); 989 } 990 return JNI_OK; 991} 992 993// It's the caller's repsonsibility to ensure glitch-freedom 994// (if required). 995void Universe::update_heap_info_at_gc() { 996 _heap_capacity_at_last_gc = heap()->capacity(); 997 _heap_used_at_last_gc = heap()->used(); 998} 999 1000 1001 1002void universe2_init() { 1003 EXCEPTION_MARK; 1004 Universe::genesis(CATCH); 1005 // Although we'd like to verify here that the state of the heap 1006 // is good, we can't because the main thread has not yet added 1007 // itself to the threads list (so, using current interfaces 1008 // we can't "fill" its TLAB), unless TLABs are disabled. 1009 if (VerifyBeforeGC && !UseTLAB && 1010 Universe::heap()->total_collections() >= VerifyGCStartAt) { 1011 Universe::heap()->prepare_for_verify(); 1012 Universe::verify(); // make sure we're starting with a clean slate 1013 } 1014} 1015 1016 1017// This function is defined in JVM.cpp 1018extern void initialize_converter_functions(); 1019 1020bool universe_post_init() { 1021 assert(!is_init_completed(), "Error: initialization not yet completed!"); 1022 Universe::_fully_initialized = true; 1023 EXCEPTION_MARK; 1024 { ResourceMark rm; 1025 Interpreter::initialize(); // needed for interpreter entry points 1026 if (!UseSharedSpaces) { 1027 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 1028 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 1029 Universe::reinitialize_itables(CHECK_false); 1030 } 1031 } 1032 1033 klassOop k; 1034 instanceKlassHandle k_h; 1035 if (!UseSharedSpaces) { 1036 // Setup preallocated empty java.lang.Class array 1037 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 1038 // Setup preallocated OutOfMemoryError errors 1039 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_OutOfMemoryError(), true, CHECK_false); 1040 k_h = instanceKlassHandle(THREAD, k); 1041 Universe::_out_of_memory_error_java_heap = k_h->allocate_permanent_instance(CHECK_false); 1042 Universe::_out_of_memory_error_perm_gen = k_h->allocate_permanent_instance(CHECK_false); 1043 Universe::_out_of_memory_error_array_size = k_h->allocate_permanent_instance(CHECK_false); 1044 Universe::_out_of_memory_error_gc_overhead_limit = 1045 k_h->allocate_permanent_instance(CHECK_false); 1046 1047 // Setup preallocated NullPointerException 1048 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1049 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_NullPointerException(), true, CHECK_false); 1050 Universe::_null_ptr_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); 1051 // Setup preallocated ArithmeticException 1052 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1053 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ArithmeticException(), true, CHECK_false); 1054 Universe::_arithmetic_exception_instance = instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); 1055 // Virtual Machine Error for when we get into a situation we can't resolve 1056 k = SystemDictionary::resolve_or_fail( 1057 vmSymbolHandles::java_lang_VirtualMachineError(), true, CHECK_false); 1058 bool linked = instanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1059 if (!linked) { 1060 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1061 return false; // initialization failed 1062 } 1063 Universe::_virtual_machine_error_instance = 1064 instanceKlass::cast(k)->allocate_permanent_instance(CHECK_false); 1065 } 1066 if (!DumpSharedSpaces) { 1067 // These are the only Java fields that are currently set during shared space dumping. 1068 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1069 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1070 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1071 1072 msg = java_lang_String::create_from_str("PermGen space", CHECK_false); 1073 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); 1074 1075 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1076 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1077 1078 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1079 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1080 1081 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1082 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1083 1084 // Setup the array of errors that have preallocated backtrace 1085 k = Universe::_out_of_memory_error_java_heap->klass(); 1086 assert(k->klass_part()->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1087 k_h = instanceKlassHandle(THREAD, k); 1088 1089 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1090 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1091 for (int i=0; i<len; i++) { 1092 oop err = k_h->allocate_permanent_instance(CHECK_false); 1093 Handle err_h = Handle(THREAD, err); 1094 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1095 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1096 } 1097 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1098 } 1099 1100 1101 // Setup static method for registering finalizers 1102 // The finalizer klass must be linked before looking up the method, in 1103 // case it needs to get rewritten. 1104 instanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1105 methodOop m = instanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1106 vmSymbols::register_method_name(), 1107 vmSymbols::register_method_signature()); 1108 if (m == NULL || !m->is_static()) { 1109 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1110 "java.lang.ref.Finalizer.register", false); 1111 } 1112 Universe::_finalizer_register_cache->init( 1113 SystemDictionary::Finalizer_klass(), m, CHECK_false); 1114 1115 // Resolve on first use and initialize class. 1116 // Note: No race-condition here, since a resolve will always return the same result 1117 1118 // Setup method for security checks 1119 k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_reflect_Method(), true, CHECK_false); 1120 k_h = instanceKlassHandle(THREAD, k); 1121 k_h->link_class(CHECK_false); 1122 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); 1123 if (m == NULL || m->is_static()) { 1124 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1125 "java.lang.reflect.Method.invoke", false); 1126 } 1127 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); 1128 1129 // Setup method for registering loaded classes in class loader vector 1130 instanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1131 m = instanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1132 if (m == NULL || m->is_static()) { 1133 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1134 "java.lang.ClassLoader.addClass", false); 1135 } 1136 Universe::_loader_addClass_cache->init( 1137 SystemDictionary::ClassLoader_klass(), m, CHECK_false); 1138 1139 // The folowing is initializing converter functions for serialization in 1140 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1141 // a better solution for this as well. 1142 initialize_converter_functions(); 1143 1144 // This needs to be done before the first scavenge/gc, since 1145 // it's an input to soft ref clearing policy. 1146 { 1147 MutexLocker x(Heap_lock); 1148 Universe::update_heap_info_at_gc(); 1149 } 1150 1151 // ("weak") refs processing infrastructure initialization 1152 Universe::heap()->post_initialize(); 1153 1154 GC_locker::unlock(); // allow gc after bootstrapping 1155 1156 MemoryService::set_universe_heap(Universe::_collectedHeap); 1157 return true; 1158} 1159 1160 1161void Universe::compute_base_vtable_size() { 1162 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1163} 1164 1165 1166// %%% The Universe::flush_foo methods belong in CodeCache. 1167 1168// Flushes compiled methods dependent on dependee. 1169void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1170 assert_lock_strong(Compile_lock); 1171 1172 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1173 1174 // CodeCache can only be updated by a thread_in_VM and they will all be 1175 // stopped dring the safepoint so CodeCache will be safe to update without 1176 // holding the CodeCache_lock. 1177 1178 DepChange changes(dependee); 1179 1180 // Compute the dependent nmethods 1181 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1182 // At least one nmethod has been marked for deoptimization 1183 VM_Deoptimize op; 1184 VMThread::execute(&op); 1185 } 1186} 1187 1188#ifdef HOTSWAP 1189// Flushes compiled methods dependent on dependee in the evolutionary sense 1190void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1191 // --- Compile_lock is not held. However we are at a safepoint. 1192 assert_locked_or_safepoint(Compile_lock); 1193 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1194 1195 // CodeCache can only be updated by a thread_in_VM and they will all be 1196 // stopped dring the safepoint so CodeCache will be safe to update without 1197 // holding the CodeCache_lock. 1198 1199 // Compute the dependent nmethods 1200 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1201 // At least one nmethod has been marked for deoptimization 1202 1203 // All this already happens inside a VM_Operation, so we'll do all the work here. 1204 // Stuff copied from VM_Deoptimize and modified slightly. 1205 1206 // We do not want any GCs to happen while we are in the middle of this VM operation 1207 ResourceMark rm; 1208 DeoptimizationMarker dm; 1209 1210 // Deoptimize all activations depending on marked nmethods 1211 Deoptimization::deoptimize_dependents(); 1212 1213 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1214 CodeCache::make_marked_nmethods_not_entrant(); 1215 } 1216} 1217#endif // HOTSWAP 1218 1219 1220// Flushes compiled methods dependent on dependee 1221void Universe::flush_dependents_on_method(methodHandle m_h) { 1222 // --- Compile_lock is not held. However we are at a safepoint. 1223 assert_locked_or_safepoint(Compile_lock); 1224 1225 // CodeCache can only be updated by a thread_in_VM and they will all be 1226 // stopped dring the safepoint so CodeCache will be safe to update without 1227 // holding the CodeCache_lock. 1228 1229 // Compute the dependent nmethods 1230 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1231 // At least one nmethod has been marked for deoptimization 1232 1233 // All this already happens inside a VM_Operation, so we'll do all the work here. 1234 // Stuff copied from VM_Deoptimize and modified slightly. 1235 1236 // We do not want any GCs to happen while we are in the middle of this VM operation 1237 ResourceMark rm; 1238 DeoptimizationMarker dm; 1239 1240 // Deoptimize all activations depending on marked nmethods 1241 Deoptimization::deoptimize_dependents(); 1242 1243 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1244 CodeCache::make_marked_nmethods_not_entrant(); 1245 } 1246} 1247 1248void Universe::print() { print_on(gclog_or_tty); } 1249 1250void Universe::print_on(outputStream* st) { 1251 st->print_cr("Heap"); 1252 heap()->print_on(st); 1253} 1254 1255void Universe::print_heap_at_SIGBREAK() { 1256 if (PrintHeapAtSIGBREAK) { 1257 MutexLocker hl(Heap_lock); 1258 print_on(tty); 1259 tty->cr(); 1260 tty->flush(); 1261 } 1262} 1263 1264void Universe::print_heap_before_gc(outputStream* st) { 1265 st->print_cr("{Heap before GC invocations=%u (full %u):", 1266 heap()->total_collections(), 1267 heap()->total_full_collections()); 1268 heap()->print_on(st); 1269} 1270 1271void Universe::print_heap_after_gc(outputStream* st) { 1272 st->print_cr("Heap after GC invocations=%u (full %u):", 1273 heap()->total_collections(), 1274 heap()->total_full_collections()); 1275 heap()->print_on(st); 1276 st->print_cr("}"); 1277} 1278 1279void Universe::verify(bool allow_dirty, bool silent, bool option) { 1280 if (SharedSkipVerify) { 1281 return; 1282 } 1283 1284 // The use of _verify_in_progress is a temporary work around for 1285 // 6320749. Don't bother with a creating a class to set and clear 1286 // it since it is only used in this method and the control flow is 1287 // straight forward. 1288 _verify_in_progress = true; 1289 1290 COMPILER2_PRESENT( 1291 assert(!DerivedPointerTable::is_active(), 1292 "DPT should not be active during verification " 1293 "(of thread stacks below)"); 1294 ) 1295 1296 ResourceMark rm; 1297 HandleMark hm; // Handles created during verification can be zapped 1298 _verify_count++; 1299 1300 if (!silent) gclog_or_tty->print("[Verifying "); 1301 if (!silent) gclog_or_tty->print("threads "); 1302 Threads::verify(); 1303 heap()->verify(allow_dirty, silent, option); 1304 1305 if (!silent) gclog_or_tty->print("syms "); 1306 SymbolTable::verify(); 1307 if (!silent) gclog_or_tty->print("strs "); 1308 StringTable::verify(); 1309 { 1310 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1311 if (!silent) gclog_or_tty->print("zone "); 1312 CodeCache::verify(); 1313 } 1314 if (!silent) gclog_or_tty->print("dict "); 1315 SystemDictionary::verify(); 1316 if (!silent) gclog_or_tty->print("hand "); 1317 JNIHandles::verify(); 1318 if (!silent) gclog_or_tty->print("C-heap "); 1319 os::check_heap(); 1320 if (!silent) gclog_or_tty->print_cr("]"); 1321 1322 _verify_in_progress = false; 1323} 1324 1325// Oop verification (see MacroAssembler::verify_oop) 1326 1327static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1328static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1329 1330 1331static void calculate_verify_data(uintptr_t verify_data[2], 1332 HeapWord* low_boundary, 1333 HeapWord* high_boundary) { 1334 assert(low_boundary < high_boundary, "bad interval"); 1335 1336 // decide which low-order bits we require to be clear: 1337 size_t alignSize = MinObjAlignmentInBytes; 1338 size_t min_object_size = CollectedHeap::min_fill_size(); 1339 1340 // make an inclusive limit: 1341 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1342 uintptr_t min = (uintptr_t)low_boundary; 1343 assert(min < max, "bad interval"); 1344 uintptr_t diff = max ^ min; 1345 1346 // throw away enough low-order bits to make the diff vanish 1347 uintptr_t mask = (uintptr_t)(-1); 1348 while ((mask & diff) != 0) 1349 mask <<= 1; 1350 uintptr_t bits = (min & mask); 1351 assert(bits == (max & mask), "correct mask"); 1352 // check an intermediate value between min and max, just to make sure: 1353 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1354 1355 // require address alignment, too: 1356 mask |= (alignSize - 1); 1357 1358 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1359 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1360 } 1361 verify_data[0] = mask; 1362 verify_data[1] = bits; 1363} 1364 1365 1366// Oop verification (see MacroAssembler::verify_oop) 1367#ifndef PRODUCT 1368 1369uintptr_t Universe::verify_oop_mask() { 1370 MemRegion m = heap()->reserved_region(); 1371 calculate_verify_data(_verify_oop_data, 1372 m.start(), 1373 m.end()); 1374 return _verify_oop_data[0]; 1375} 1376 1377 1378 1379uintptr_t Universe::verify_oop_bits() { 1380 verify_oop_mask(); 1381 return _verify_oop_data[1]; 1382} 1383 1384 1385uintptr_t Universe::verify_klass_mask() { 1386 /* $$$ 1387 // A klass can never live in the new space. Since the new and old 1388 // spaces can change size, we must settle for bounds-checking against 1389 // the bottom of the world, plus the smallest possible new and old 1390 // space sizes that may arise during execution. 1391 size_t min_new_size = Universe::new_size(); // in bytes 1392 size_t min_old_size = Universe::old_size(); // in bytes 1393 calculate_verify_data(_verify_klass_data, 1394 (HeapWord*)((uintptr_t)_new_gen->low_boundary + min_new_size + min_old_size), 1395 _perm_gen->high_boundary); 1396 */ 1397 // Why doesn't the above just say that klass's always live in the perm 1398 // gen? I'll see if that seems to work... 1399 MemRegion permanent_reserved; 1400 switch (Universe::heap()->kind()) { 1401 default: 1402 // ???: What if a CollectedHeap doesn't have a permanent generation? 1403 ShouldNotReachHere(); 1404 break; 1405 case CollectedHeap::GenCollectedHeap: 1406 case CollectedHeap::G1CollectedHeap: { 1407 SharedHeap* sh = (SharedHeap*) Universe::heap(); 1408 permanent_reserved = sh->perm_gen()->reserved(); 1409 break; 1410 } 1411#ifndef SERIALGC 1412 case CollectedHeap::ParallelScavengeHeap: { 1413 ParallelScavengeHeap* psh = (ParallelScavengeHeap*) Universe::heap(); 1414 permanent_reserved = psh->perm_gen()->reserved(); 1415 break; 1416 } 1417#endif // SERIALGC 1418 } 1419 calculate_verify_data(_verify_klass_data, 1420 permanent_reserved.start(), 1421 permanent_reserved.end()); 1422 1423 return _verify_klass_data[0]; 1424} 1425 1426 1427 1428uintptr_t Universe::verify_klass_bits() { 1429 verify_klass_mask(); 1430 return _verify_klass_data[1]; 1431} 1432 1433 1434uintptr_t Universe::verify_mark_mask() { 1435 return markOopDesc::lock_mask_in_place; 1436} 1437 1438 1439 1440uintptr_t Universe::verify_mark_bits() { 1441 intptr_t mask = verify_mark_mask(); 1442 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1443 assert((bits & ~mask) == 0, "no stray header bits"); 1444 return bits; 1445} 1446#endif // PRODUCT 1447 1448 1449void Universe::compute_verify_oop_data() { 1450 verify_oop_mask(); 1451 verify_oop_bits(); 1452 verify_mark_mask(); 1453 verify_mark_bits(); 1454 verify_klass_mask(); 1455 verify_klass_bits(); 1456} 1457 1458 1459void CommonMethodOopCache::init(klassOop k, methodOop m, TRAPS) { 1460 if (!UseSharedSpaces) { 1461 _klass = k; 1462 } 1463#ifndef PRODUCT 1464 else { 1465 // sharing initilization should have already set up _klass 1466 assert(_klass != NULL, "just checking"); 1467 } 1468#endif 1469 1470 _method_idnum = m->method_idnum(); 1471 assert(_method_idnum >= 0, "sanity check"); 1472} 1473 1474 1475ActiveMethodOopsCache::~ActiveMethodOopsCache() { 1476 if (_prev_methods != NULL) { 1477 for (int i = _prev_methods->length() - 1; i >= 0; i--) { 1478 jweak method_ref = _prev_methods->at(i); 1479 if (method_ref != NULL) { 1480 JNIHandles::destroy_weak_global(method_ref); 1481 } 1482 } 1483 delete _prev_methods; 1484 _prev_methods = NULL; 1485 } 1486} 1487 1488 1489void ActiveMethodOopsCache::add_previous_version(const methodOop method) { 1490 assert(Thread::current()->is_VM_thread(), 1491 "only VMThread can add previous versions"); 1492 1493 if (_prev_methods == NULL) { 1494 // This is the first previous version so make some space. 1495 // Start with 2 elements under the assumption that the class 1496 // won't be redefined much. 1497 _prev_methods = new (ResourceObj::C_HEAP) GrowableArray<jweak>(2, true); 1498 } 1499 1500 // RC_TRACE macro has an embedded ResourceMark 1501 RC_TRACE(0x00000100, 1502 ("add: %s(%s): adding prev version ref for cached method @%d", 1503 method->name()->as_C_string(), method->signature()->as_C_string(), 1504 _prev_methods->length())); 1505 1506 methodHandle method_h(method); 1507 jweak method_ref = JNIHandles::make_weak_global(method_h); 1508 _prev_methods->append(method_ref); 1509 1510 // Using weak references allows previous versions of the cached 1511 // method to be GC'ed when they are no longer needed. Since the 1512 // caller is the VMThread and we are at a safepoint, this is a good 1513 // time to clear out unused weak references. 1514 1515 for (int i = _prev_methods->length() - 1; i >= 0; i--) { 1516 jweak method_ref = _prev_methods->at(i); 1517 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); 1518 if (method_ref == NULL) { 1519 _prev_methods->remove_at(i); 1520 // Since we are traversing the array backwards, we don't have to 1521 // do anything special with the index. 1522 continue; // robustness 1523 } 1524 1525 methodOop m = (methodOop)JNIHandles::resolve(method_ref); 1526 if (m == NULL) { 1527 // this method entry has been GC'ed so remove it 1528 JNIHandles::destroy_weak_global(method_ref); 1529 _prev_methods->remove_at(i); 1530 } else { 1531 // RC_TRACE macro has an embedded ResourceMark 1532 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", 1533 m->name()->as_C_string(), m->signature()->as_C_string(), i)); 1534 } 1535 } 1536} // end add_previous_version() 1537 1538 1539bool ActiveMethodOopsCache::is_same_method(const methodOop method) const { 1540 instanceKlass* ik = instanceKlass::cast(klass()); 1541 methodOop check_method = ik->method_with_idnum(method_idnum()); 1542 assert(check_method != NULL, "sanity check"); 1543 if (check_method == method) { 1544 // done with the easy case 1545 return true; 1546 } 1547 1548 if (_prev_methods != NULL) { 1549 // The cached method has been redefined at least once so search 1550 // the previous versions for a match. 1551 for (int i = 0; i < _prev_methods->length(); i++) { 1552 jweak method_ref = _prev_methods->at(i); 1553 assert(method_ref != NULL, "weak method ref was unexpectedly cleared"); 1554 if (method_ref == NULL) { 1555 continue; // robustness 1556 } 1557 1558 check_method = (methodOop)JNIHandles::resolve(method_ref); 1559 if (check_method == method) { 1560 // a previous version matches 1561 return true; 1562 } 1563 } 1564 } 1565 1566 // either no previous versions or no previous version matched 1567 return false; 1568} 1569 1570 1571methodOop LatestMethodOopCache::get_methodOop() { 1572 instanceKlass* ik = instanceKlass::cast(klass()); 1573 methodOop m = ik->method_with_idnum(method_idnum()); 1574 assert(m != NULL, "sanity check"); 1575 return m; 1576} 1577 1578 1579#ifdef ASSERT 1580// Release dummy object(s) at bottom of heap 1581bool Universe::release_fullgc_alot_dummy() { 1582 MutexLocker ml(FullGCALot_lock); 1583 if (_fullgc_alot_dummy_array != NULL) { 1584 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1585 // No more dummies to release, release entire array instead 1586 _fullgc_alot_dummy_array = NULL; 1587 return false; 1588 } 1589 if (!UseConcMarkSweepGC) { 1590 // Release dummy at bottom of old generation 1591 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1592 } 1593 // Release dummy at bottom of permanent generation 1594 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1595 } 1596 return true; 1597} 1598 1599#endif // ASSERT 1600