--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/universe.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,1397 @@
+/*
+ * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "aot/aotLoader.hpp"
+#include "classfile/classLoader.hpp"
+#include "classfile/classLoaderData.hpp"
+#include "classfile/javaClasses.hpp"
+#include "classfile/stringTable.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "classfile/vmSymbols.hpp"
+#include "code/codeCache.hpp"
+#include "code/dependencies.hpp"
+#include "gc/shared/cardTableModRefBS.hpp"
+#include "gc/shared/collectedHeap.inline.hpp"
+#include "gc/shared/gcLocker.inline.hpp"
+#include "gc/shared/genCollectedHeap.hpp"
+#include "gc/shared/generation.hpp"
+#include "gc/shared/gcTraceTime.inline.hpp"
+#include "gc/shared/space.hpp"
+#include "interpreter/interpreter.hpp"
+#include "logging/log.hpp"
+#include "logging/logStream.hpp"
+#include "memory/filemap.hpp"
+#include "memory/metadataFactory.hpp"
+#include "memory/metaspaceClosure.hpp"
+#include "memory/metaspaceShared.hpp"
+#include "memory/oopFactory.hpp"
+#include "memory/resourceArea.hpp"
+#include "memory/universe.hpp"
+#include "memory/universe.inline.hpp"
+#include "oops/constantPool.hpp"
+#include "oops/instanceClassLoaderKlass.hpp"
+#include "oops/instanceKlass.hpp"
+#include "oops/instanceMirrorKlass.hpp"
+#include "oops/instanceRefKlass.hpp"
+#include "oops/objArrayOop.inline.hpp"
+#include "oops/oop.inline.hpp"
+#include "oops/typeArrayKlass.hpp"
+#include "prims/resolvedMethodTable.hpp"
+#include "runtime/arguments.hpp"
+#include "runtime/atomic.hpp"
+#include "runtime/commandLineFlagConstraintList.hpp"
+#include "runtime/deoptimization.hpp"
+#include "runtime/handles.inline.hpp"
+#include "runtime/init.hpp"
+#include "runtime/java.hpp"
+#include "runtime/javaCalls.hpp"
+#include "runtime/sharedRuntime.hpp"
+#include "runtime/synchronizer.hpp"
+#include "runtime/thread.inline.hpp"
+#include "runtime/timerTrace.hpp"
+#include "runtime/vm_operations.hpp"
+#include "services/memoryService.hpp"
+#include "utilities/align.hpp"
+#include "utilities/copy.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/events.hpp"
+#include "utilities/formatBuffer.hpp"
+#include "utilities/hashtable.inline.hpp"
+#include "utilities/macros.hpp"
+#include "utilities/ostream.hpp"
+#include "utilities/preserveException.hpp"
+#if INCLUDE_ALL_GCS
+#include "gc/cms/cmsCollectorPolicy.hpp"
+#include "gc/g1/g1CollectedHeap.inline.hpp"
+#include "gc/g1/g1CollectorPolicy.hpp"
+#include "gc/parallel/parallelScavengeHeap.hpp"
+#include "gc/shared/adaptiveSizePolicy.hpp"
+#endif // INCLUDE_ALL_GCS
+#if INCLUDE_CDS
+#include "classfile/sharedClassUtil.hpp"
+#endif
+
+// Known objects
+Klass* Universe::_boolArrayKlassObj = NULL;
+Klass* Universe::_byteArrayKlassObj = NULL;
+Klass* Universe::_charArrayKlassObj = NULL;
+Klass* Universe::_intArrayKlassObj = NULL;
+Klass* Universe::_shortArrayKlassObj = NULL;
+Klass* Universe::_longArrayKlassObj = NULL;
+Klass* Universe::_singleArrayKlassObj = NULL;
+Klass* Universe::_doubleArrayKlassObj = NULL;
+Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ };
+Klass* Universe::_objectArrayKlassObj = NULL;
+oop Universe::_int_mirror = NULL;
+oop Universe::_float_mirror = NULL;
+oop Universe::_double_mirror = NULL;
+oop Universe::_byte_mirror = NULL;
+oop Universe::_bool_mirror = NULL;
+oop Universe::_char_mirror = NULL;
+oop Universe::_long_mirror = NULL;
+oop Universe::_short_mirror = NULL;
+oop Universe::_void_mirror = NULL;
+oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ };
+oop Universe::_main_thread_group = NULL;
+oop Universe::_system_thread_group = NULL;
+objArrayOop Universe::_the_empty_class_klass_array = NULL;
+Array<Klass*>* Universe::_the_array_interfaces_array = NULL;
+oop Universe::_the_null_string = NULL;
+oop Universe::_the_min_jint_string = NULL;
+LatestMethodCache* Universe::_finalizer_register_cache = NULL;
+LatestMethodCache* Universe::_loader_addClass_cache = NULL;
+LatestMethodCache* Universe::_pd_implies_cache = NULL;
+LatestMethodCache* Universe::_throw_illegal_access_error_cache = NULL;
+LatestMethodCache* Universe::_do_stack_walk_cache = NULL;
+oop Universe::_out_of_memory_error_java_heap = NULL;
+oop Universe::_out_of_memory_error_metaspace = NULL;
+oop Universe::_out_of_memory_error_class_metaspace = NULL;
+oop Universe::_out_of_memory_error_array_size = NULL;
+oop Universe::_out_of_memory_error_gc_overhead_limit = NULL;
+oop Universe::_out_of_memory_error_realloc_objects = NULL;
+oop Universe::_delayed_stack_overflow_error_message = NULL;
+objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL;
+volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0;
+bool Universe::_verify_in_progress = false;
+long Universe::verify_flags = Universe::Verify_All;
+oop Universe::_null_ptr_exception_instance = NULL;
+oop Universe::_arithmetic_exception_instance = NULL;
+oop Universe::_virtual_machine_error_instance = NULL;
+oop Universe::_vm_exception = NULL;
+oop Universe::_allocation_context_notification_obj = NULL;
+oop Universe::_reference_pending_list = NULL;
+
+Array<int>* Universe::_the_empty_int_array = NULL;
+Array<u2>* Universe::_the_empty_short_array = NULL;
+Array<Klass*>* Universe::_the_empty_klass_array = NULL;
+Array<Method*>* Universe::_the_empty_method_array = NULL;
+
+// These variables are guarded by FullGCALot_lock.
+debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;)
+debug_only(int Universe::_fullgc_alot_dummy_next = 0;)
+
+// Heap
+int Universe::_verify_count = 0;
+
+// Oop verification (see MacroAssembler::verify_oop)
+uintptr_t Universe::_verify_oop_mask = 0;
+uintptr_t Universe::_verify_oop_bits = (uintptr_t) -1;
+
+int Universe::_base_vtable_size = 0;
+bool Universe::_bootstrapping = false;
+bool Universe::_module_initialized = false;
+bool Universe::_fully_initialized = false;
+
+size_t Universe::_heap_capacity_at_last_gc;
+size_t Universe::_heap_used_at_last_gc = 0;
+
+CollectedHeap* Universe::_collectedHeap = NULL;
+
+NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true };
+NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true };
+address Universe::_narrow_ptrs_base;
+
+void Universe::basic_type_classes_do(void f(Klass*)) {
+ f(boolArrayKlassObj());
+ f(byteArrayKlassObj());
+ f(charArrayKlassObj());
+ f(intArrayKlassObj());
+ f(shortArrayKlassObj());
+ f(longArrayKlassObj());
+ f(singleArrayKlassObj());
+ f(doubleArrayKlassObj());
+}
+
+void Universe::oops_do(OopClosure* f, bool do_all) {
+
+ f->do_oop((oop*) &_int_mirror);
+ f->do_oop((oop*) &_float_mirror);
+ f->do_oop((oop*) &_double_mirror);
+ f->do_oop((oop*) &_byte_mirror);
+ f->do_oop((oop*) &_bool_mirror);
+ f->do_oop((oop*) &_char_mirror);
+ f->do_oop((oop*) &_long_mirror);
+ f->do_oop((oop*) &_short_mirror);
+ f->do_oop((oop*) &_void_mirror);
+
+ for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
+ f->do_oop((oop*) &_mirrors[i]);
+ }
+ assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
+
+ f->do_oop((oop*)&_the_empty_class_klass_array);
+ f->do_oop((oop*)&_the_null_string);
+ f->do_oop((oop*)&_the_min_jint_string);
+ f->do_oop((oop*)&_out_of_memory_error_java_heap);
+ f->do_oop((oop*)&_out_of_memory_error_metaspace);
+ f->do_oop((oop*)&_out_of_memory_error_class_metaspace);
+ f->do_oop((oop*)&_out_of_memory_error_array_size);
+ f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit);
+ f->do_oop((oop*)&_out_of_memory_error_realloc_objects);
+ f->do_oop((oop*)&_delayed_stack_overflow_error_message);
+ f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
+ f->do_oop((oop*)&_null_ptr_exception_instance);
+ f->do_oop((oop*)&_arithmetic_exception_instance);
+ f->do_oop((oop*)&_virtual_machine_error_instance);
+ f->do_oop((oop*)&_main_thread_group);
+ f->do_oop((oop*)&_system_thread_group);
+ f->do_oop((oop*)&_vm_exception);
+ f->do_oop((oop*)&_allocation_context_notification_obj);
+ f->do_oop((oop*)&_reference_pending_list);
+ debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
+}
+
+void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
+ it->push(&_klass);
+}
+
+void Universe::metaspace_pointers_do(MetaspaceClosure* it) {
+ it->push(&_boolArrayKlassObj);
+ it->push(&_byteArrayKlassObj);
+ it->push(&_charArrayKlassObj);
+ it->push(&_intArrayKlassObj);
+ it->push(&_shortArrayKlassObj);
+ it->push(&_longArrayKlassObj);
+ it->push(&_singleArrayKlassObj);
+ it->push(&_doubleArrayKlassObj);
+ for (int i = 0; i < T_VOID+1; i++) {
+ it->push(&_typeArrayKlassObjs[i]);
+ }
+ it->push(&_objectArrayKlassObj);
+
+ it->push(&_the_empty_int_array);
+ it->push(&_the_empty_short_array);
+ it->push(&_the_empty_klass_array);
+ it->push(&_the_empty_method_array);
+ it->push(&_the_array_interfaces_array);
+
+ _finalizer_register_cache->metaspace_pointers_do(it);
+ _loader_addClass_cache->metaspace_pointers_do(it);
+ _pd_implies_cache->metaspace_pointers_do(it);
+ _throw_illegal_access_error_cache->metaspace_pointers_do(it);
+ _do_stack_walk_cache->metaspace_pointers_do(it);
+}
+
+// Serialize metadata in and out of CDS archive, not oops.
+void Universe::serialize(SerializeClosure* f, bool do_all) {
+
+ f->do_ptr((void**)&_boolArrayKlassObj);
+ f->do_ptr((void**)&_byteArrayKlassObj);
+ f->do_ptr((void**)&_charArrayKlassObj);
+ f->do_ptr((void**)&_intArrayKlassObj);
+ f->do_ptr((void**)&_shortArrayKlassObj);
+ f->do_ptr((void**)&_longArrayKlassObj);
+ f->do_ptr((void**)&_singleArrayKlassObj);
+ f->do_ptr((void**)&_doubleArrayKlassObj);
+ f->do_ptr((void**)&_objectArrayKlassObj);
+
+ {
+ for (int i = 0; i < T_VOID+1; i++) {
+ if (_typeArrayKlassObjs[i] != NULL) {
+ assert(i >= T_BOOLEAN, "checking");
+ f->do_ptr((void**)&_typeArrayKlassObjs[i]);
+ } else if (do_all) {
+ f->do_ptr((void**)&_typeArrayKlassObjs[i]);
+ }
+ }
+ }
+
+ f->do_ptr((void**)&_the_array_interfaces_array);
+ f->do_ptr((void**)&_the_empty_int_array);
+ f->do_ptr((void**)&_the_empty_short_array);
+ f->do_ptr((void**)&_the_empty_method_array);
+ f->do_ptr((void**)&_the_empty_klass_array);
+ _finalizer_register_cache->serialize(f);
+ _loader_addClass_cache->serialize(f);
+ _pd_implies_cache->serialize(f);
+ _throw_illegal_access_error_cache->serialize(f);
+ _do_stack_walk_cache->serialize(f);
+}
+
+void Universe::check_alignment(uintx size, uintx alignment, const char* name) {
+ if (size < alignment || size % alignment != 0) {
+ vm_exit_during_initialization(
+ err_msg("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment));
+ }
+}
+
+void initialize_basic_type_klass(Klass* k, TRAPS) {
+ Klass* ok = SystemDictionary::Object_klass();
+#if INCLUDE_CDS
+ if (UseSharedSpaces) {
+ ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
+ assert(k->super() == ok, "u3");
+ k->restore_unshareable_info(loader_data, Handle(), CHECK);
+ } else
+#endif
+ {
+ k->initialize_supers(ok, CHECK);
+ }
+ k->append_to_sibling_list();
+}
+
+void Universe::genesis(TRAPS) {
+ ResourceMark rm;
+
+ { FlagSetting fs(_bootstrapping, true);
+
+ { MutexLocker mc(Compile_lock);
+
+ java_lang_Class::allocate_fixup_lists();
+
+ // determine base vtable size; without that we cannot create the array klasses
+ compute_base_vtable_size();
+
+ if (!UseSharedSpaces) {
+ _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK);
+ _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK);
+ _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK);
+ _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK);
+ _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK);
+ _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK);
+ _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK);
+ _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK);
+
+ _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj;
+ _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj;
+ _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj;
+ _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj;
+ _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj;
+ _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj;
+ _typeArrayKlassObjs[T_INT] = _intArrayKlassObj;
+ _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj;
+
+ ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
+
+ _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK);
+ _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK);
+ _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK);
+ _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK);
+ _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK);
+ }
+ }
+
+ vmSymbols::initialize(CHECK);
+
+ SystemDictionary::initialize(CHECK);
+
+ Klass* ok = SystemDictionary::Object_klass();
+
+ _the_null_string = StringTable::intern("null", CHECK);
+ _the_min_jint_string = StringTable::intern("-2147483648", CHECK);
+
+#if INCLUDE_CDS
+ if (UseSharedSpaces) {
+ // Verify shared interfaces array.
+ assert(_the_array_interfaces_array->at(0) ==
+ SystemDictionary::Cloneable_klass(), "u3");
+ assert(_the_array_interfaces_array->at(1) ==
+ SystemDictionary::Serializable_klass(), "u3");
+ MetaspaceShared::fixup_mapped_heap_regions();
+ } else
+#endif
+ {
+ // Set up shared interfaces array. (Do this before supers are set up.)
+ _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass());
+ _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass());
+ }
+
+ initialize_basic_type_klass(boolArrayKlassObj(), CHECK);
+ initialize_basic_type_klass(charArrayKlassObj(), CHECK);
+ initialize_basic_type_klass(singleArrayKlassObj(), CHECK);
+ initialize_basic_type_klass(doubleArrayKlassObj(), CHECK);
+ initialize_basic_type_klass(byteArrayKlassObj(), CHECK);
+ initialize_basic_type_klass(shortArrayKlassObj(), CHECK);
+ initialize_basic_type_klass(intArrayKlassObj(), CHECK);
+ initialize_basic_type_klass(longArrayKlassObj(), CHECK);
+ } // end of core bootstrapping
+
+ // Maybe this could be lifted up now that object array can be initialized
+ // during the bootstrapping.
+
+ // OLD
+ // Initialize _objectArrayKlass after core bootstraping to make
+ // sure the super class is set up properly for _objectArrayKlass.
+ // ---
+ // NEW
+ // Since some of the old system object arrays have been converted to
+ // ordinary object arrays, _objectArrayKlass will be loaded when
+ // SystemDictionary::initialize(CHECK); is run. See the extra check
+ // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl.
+ _objectArrayKlassObj = InstanceKlass::
+ cast(SystemDictionary::Object_klass())->array_klass(1, CHECK);
+ // OLD
+ // Add the class to the class hierarchy manually to make sure that
+ // its vtable is initialized after core bootstrapping is completed.
+ // ---
+ // New
+ // Have already been initialized.
+ _objectArrayKlassObj->append_to_sibling_list();
+
+ #ifdef ASSERT
+ if (FullGCALot) {
+ // Allocate an array of dummy objects.
+ // We'd like these to be at the bottom of the old generation,
+ // so that when we free one and then collect,
+ // (almost) the whole heap moves
+ // and we find out if we actually update all the oops correctly.
+ // But we can't allocate directly in the old generation,
+ // so we allocate wherever, and hope that the first collection
+ // moves these objects to the bottom of the old generation.
+ // We can allocate directly in the permanent generation, so we do.
+ int size;
+ if (UseConcMarkSweepGC) {
+ log_warning(gc)("Using +FullGCALot with concurrent mark sweep gc will not force all objects to relocate");
+ size = FullGCALotDummies;
+ } else {
+ size = FullGCALotDummies * 2;
+ }
+ objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK);
+ objArrayHandle dummy_array(THREAD, naked_array);
+ int i = 0;
+ while (i < size) {
+ // Allocate dummy in old generation
+ oop dummy = SystemDictionary::Object_klass()->allocate_instance(CHECK);
+ dummy_array->obj_at_put(i++, dummy);
+ }
+ {
+ // Only modify the global variable inside the mutex.
+ // If we had a race to here, the other dummy_array instances
+ // and their elements just get dropped on the floor, which is fine.
+ MutexLocker ml(FullGCALot_lock);
+ if (_fullgc_alot_dummy_array == NULL) {
+ _fullgc_alot_dummy_array = dummy_array();
+ }
+ }
+ assert(i == _fullgc_alot_dummy_array->length(), "just checking");
+ }
+ #endif
+
+ // Initialize dependency array for null class loader
+ ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK);
+
+}
+
+void Universe::initialize_basic_type_mirrors(TRAPS) {
+ assert(_int_mirror==NULL, "basic type mirrors already initialized");
+ _int_mirror =
+ java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK);
+ _float_mirror =
+ java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK);
+ _double_mirror =
+ java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK);
+ _byte_mirror =
+ java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK);
+ _bool_mirror =
+ java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK);
+ _char_mirror =
+ java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK);
+ _long_mirror =
+ java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK);
+ _short_mirror =
+ java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK);
+ _void_mirror =
+ java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK);
+
+ _mirrors[T_INT] = _int_mirror;
+ _mirrors[T_FLOAT] = _float_mirror;
+ _mirrors[T_DOUBLE] = _double_mirror;
+ _mirrors[T_BYTE] = _byte_mirror;
+ _mirrors[T_BOOLEAN] = _bool_mirror;
+ _mirrors[T_CHAR] = _char_mirror;
+ _mirrors[T_LONG] = _long_mirror;
+ _mirrors[T_SHORT] = _short_mirror;
+ _mirrors[T_VOID] = _void_mirror;
+ //_mirrors[T_OBJECT] = _object_klass->java_mirror();
+ //_mirrors[T_ARRAY] = _object_klass->java_mirror();
+}
+
+void Universe::fixup_mirrors(TRAPS) {
+ // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly,
+ // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply
+ // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note
+ // that the number of objects allocated at this point is very small.
+ assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded");
+ HandleMark hm(THREAD);
+ // Cache the start of the static fields
+ InstanceMirrorKlass::init_offset_of_static_fields();
+
+ GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list();
+ int list_length = list->length();
+ for (int i = 0; i < list_length; i++) {
+ Klass* k = list->at(i);
+ assert(k->is_klass(), "List should only hold classes");
+ EXCEPTION_MARK;
+ java_lang_Class::fixup_mirror(k, CATCH);
+ }
+ delete java_lang_Class::fixup_mirror_list();
+ java_lang_Class::set_fixup_mirror_list(NULL);
+}
+
+#define assert_pll_locked(test) \
+ assert(Heap_lock->test(), "Reference pending list access requires lock")
+
+#define assert_pll_ownership() assert_pll_locked(owned_by_self)
+
+oop Universe::reference_pending_list() {
+ if (Thread::current()->is_VM_thread()) {
+ assert_pll_locked(is_locked);
+ } else {
+ assert_pll_ownership();
+ }
+ return _reference_pending_list;
+}
+
+void Universe::set_reference_pending_list(oop list) {
+ assert_pll_ownership();
+ _reference_pending_list = list;
+}
+
+bool Universe::has_reference_pending_list() {
+ assert_pll_ownership();
+ return _reference_pending_list != NULL;
+}
+
+oop Universe::swap_reference_pending_list(oop list) {
+ assert_pll_locked(is_locked);
+ return (oop)Atomic::xchg_ptr(list, &_reference_pending_list);
+}
+
+#undef assert_pll_locked
+#undef assert_pll_ownership
+
+
+static bool has_run_finalizers_on_exit = false;
+
+void Universe::run_finalizers_on_exit() {
+ if (has_run_finalizers_on_exit) return;
+ has_run_finalizers_on_exit = true;
+
+ // Called on VM exit. This ought to be run in a separate thread.
+ log_trace(ref)("Callback to run finalizers on exit");
+ {
+ PRESERVE_EXCEPTION_MARK;
+ Klass* finalizer_klass = SystemDictionary::Finalizer_klass();
+ JavaValue result(T_VOID);
+ JavaCalls::call_static(
+ &result,
+ finalizer_klass,
+ vmSymbols::run_finalizers_on_exit_name(),
+ vmSymbols::void_method_signature(),
+ THREAD
+ );
+ // Ignore any pending exceptions
+ CLEAR_PENDING_EXCEPTION;
+ }
+}
+
+
+// initialize_vtable could cause gc if
+// 1) we specified true to initialize_vtable and
+// 2) this ran after gc was enabled
+// In case those ever change we use handles for oops
+void Universe::reinitialize_vtable_of(Klass* ko, TRAPS) {
+ // init vtable of k and all subclasses
+ ko->vtable().initialize_vtable(false, CHECK);
+ if (ko->is_instance_klass()) {
+ for (Klass* sk = ko->subklass();
+ sk != NULL;
+ sk = sk->next_sibling()) {
+ reinitialize_vtable_of(sk, CHECK);
+ }
+ }
+}
+
+
+void initialize_itable_for_klass(InstanceKlass* k, TRAPS) {
+ k->itable().initialize_itable(false, CHECK);
+}
+
+
+void Universe::reinitialize_itables(TRAPS) {
+ ClassLoaderDataGraph::dictionary_classes_do(initialize_itable_for_klass, CHECK);
+}
+
+
+bool Universe::on_page_boundary(void* addr) {
+ return is_aligned(addr, os::vm_page_size());
+}
+
+
+bool Universe::should_fill_in_stack_trace(Handle throwable) {
+ // never attempt to fill in the stack trace of preallocated errors that do not have
+ // backtrace. These errors are kept alive forever and may be "re-used" when all
+ // preallocated errors with backtrace have been consumed. Also need to avoid
+ // a potential loop which could happen if an out of memory occurs when attempting
+ // to allocate the backtrace.
+ return ((throwable() != Universe::_out_of_memory_error_java_heap) &&
+ (throwable() != Universe::_out_of_memory_error_metaspace) &&
+ (throwable() != Universe::_out_of_memory_error_class_metaspace) &&
+ (throwable() != Universe::_out_of_memory_error_array_size) &&
+ (throwable() != Universe::_out_of_memory_error_gc_overhead_limit) &&
+ (throwable() != Universe::_out_of_memory_error_realloc_objects));
+}
+
+
+oop Universe::gen_out_of_memory_error(oop default_err) {
+ // generate an out of memory error:
+ // - if there is a preallocated error and stack traces are available
+ // (j.l.Throwable is initialized), then return the preallocated
+ // error with a filled in stack trace, and with the message
+ // provided by the default error.
+ // - otherwise, return the default error, without a stack trace.
+ int next;
+ if ((_preallocated_out_of_memory_error_avail_count > 0) &&
+ SystemDictionary::Throwable_klass()->is_initialized()) {
+ next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count);
+ assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt");
+ } else {
+ next = -1;
+ }
+ if (next < 0) {
+ // all preallocated errors have been used.
+ // return default
+ return default_err;
+ } else {
+ Thread* THREAD = Thread::current();
+ Handle default_err_h(THREAD, default_err);
+ // get the error object at the slot and set set it to NULL so that the
+ // array isn't keeping it alive anymore.
+ Handle exc(THREAD, preallocated_out_of_memory_errors()->obj_at(next));
+ assert(exc() != NULL, "slot has been used already");
+ preallocated_out_of_memory_errors()->obj_at_put(next, NULL);
+
+ // use the message from the default error
+ oop msg = java_lang_Throwable::message(default_err_h());
+ assert(msg != NULL, "no message");
+ java_lang_Throwable::set_message(exc(), msg);
+
+ // populate the stack trace and return it.
+ java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc);
+ return exc();
+ }
+}
+
+intptr_t Universe::_non_oop_bits = 0;
+
+void* Universe::non_oop_word() {
+ // Neither the high bits nor the low bits of this value is allowed
+ // to look like (respectively) the high or low bits of a real oop.
+ //
+ // High and low are CPU-specific notions, but low always includes
+ // the low-order bit. Since oops are always aligned at least mod 4,
+ // setting the low-order bit will ensure that the low half of the
+ // word will never look like that of a real oop.
+ //
+ // Using the OS-supplied non-memory-address word (usually 0 or -1)
+ // will take care of the high bits, however many there are.
+
+ if (_non_oop_bits == 0) {
+ _non_oop_bits = (intptr_t)os::non_memory_address_word() | 1;
+ }
+
+ return (void*)_non_oop_bits;
+}
+
+jint universe_init() {
+ assert(!Universe::_fully_initialized, "called after initialize_vtables");
+ guarantee(1 << LogHeapWordSize == sizeof(HeapWord),
+ "LogHeapWordSize is incorrect.");
+ guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?");
+ guarantee(sizeof(oop) % sizeof(HeapWord) == 0,
+ "oop size is not not a multiple of HeapWord size");
+
+ TraceTime timer("Genesis", TRACETIME_LOG(Info, startuptime));
+
+ JavaClasses::compute_hard_coded_offsets();
+
+ jint status = Universe::initialize_heap();
+ if (status != JNI_OK) {
+ return status;
+ }
+
+ Metaspace::global_initialize();
+
+ AOTLoader::universe_init();
+
+ // Checks 'AfterMemoryInit' constraints.
+ if (!CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::AfterMemoryInit)) {
+ return JNI_EINVAL;
+ }
+
+ // Create memory for metadata. Must be after initializing heap for
+ // DumpSharedSpaces.
+ ClassLoaderData::init_null_class_loader_data();
+
+ // We have a heap so create the Method* caches before
+ // Metaspace::initialize_shared_spaces() tries to populate them.
+ Universe::_finalizer_register_cache = new LatestMethodCache();
+ Universe::_loader_addClass_cache = new LatestMethodCache();
+ Universe::_pd_implies_cache = new LatestMethodCache();
+ Universe::_throw_illegal_access_error_cache = new LatestMethodCache();
+ Universe::_do_stack_walk_cache = new LatestMethodCache();
+
+#if INCLUDE_CDS
+ if (UseSharedSpaces) {
+ // Read the data structures supporting the shared spaces (shared
+ // system dictionary, symbol table, etc.). After that, access to
+ // the file (other than the mapped regions) is no longer needed, and
+ // the file is closed. Closing the file does not affect the
+ // currently mapped regions.
+ MetaspaceShared::initialize_shared_spaces();
+ StringTable::create_table();
+ } else
+#endif
+ {
+ SymbolTable::create_table();
+ StringTable::create_table();
+
+#if INCLUDE_CDS
+ if (DumpSharedSpaces) {
+ MetaspaceShared::prepare_for_dumping();
+ }
+#endif
+ }
+ if (strlen(VerifySubSet) > 0) {
+ Universe::initialize_verify_flags();
+ }
+
+ ResolvedMethodTable::create_table();
+
+ return JNI_OK;
+}
+
+CollectedHeap* Universe::create_heap() {
+ assert(_collectedHeap == NULL, "Heap already created");
+#if !INCLUDE_ALL_GCS
+ if (UseParallelGC) {
+ fatal("UseParallelGC not supported in this VM.");
+ } else if (UseG1GC) {
+ fatal("UseG1GC not supported in this VM.");
+ } else if (UseConcMarkSweepGC) {
+ fatal("UseConcMarkSweepGC not supported in this VM.");
+#else
+ if (UseParallelGC) {
+ return Universe::create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
+ } else if (UseG1GC) {
+ return Universe::create_heap_with_policy<G1CollectedHeap, G1CollectorPolicy>();
+ } else if (UseConcMarkSweepGC) {
+ return Universe::create_heap_with_policy<GenCollectedHeap, ConcurrentMarkSweepPolicy>();
+#endif
+ } else if (UseSerialGC) {
+ return Universe::create_heap_with_policy<GenCollectedHeap, MarkSweepPolicy>();
+ }
+
+ ShouldNotReachHere();
+ return NULL;
+}
+
+// Choose the heap base address and oop encoding mode
+// when compressed oops are used:
+// Unscaled - Use 32-bits oops without encoding when
+// NarrowOopHeapBaseMin + heap_size < 4Gb
+// ZeroBased - Use zero based compressed oops with encoding when
+// NarrowOopHeapBaseMin + heap_size < 32Gb
+// HeapBased - Use compressed oops with heap base + encoding.
+
+jint Universe::initialize_heap() {
+ jint status = JNI_ERR;
+
+ _collectedHeap = create_heap_ext();
+ if (_collectedHeap == NULL) {
+ _collectedHeap = create_heap();
+ }
+
+ status = _collectedHeap->initialize();
+ if (status != JNI_OK) {
+ return status;
+ }
+ log_info(gc)("Using %s", _collectedHeap->name());
+
+ ThreadLocalAllocBuffer::set_max_size(Universe::heap()->max_tlab_size());
+
+#ifdef _LP64
+ if (UseCompressedOops) {
+ // Subtract a page because something can get allocated at heap base.
+ // This also makes implicit null checking work, because the
+ // memory+1 page below heap_base needs to cause a signal.
+ // See needs_explicit_null_check.
+ // Only set the heap base for compressed oops because it indicates
+ // compressed oops for pstack code.
+ if ((uint64_t)Universe::heap()->reserved_region().end() > UnscaledOopHeapMax) {
+ // Didn't reserve heap below 4Gb. Must shift.
+ Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
+ }
+ if ((uint64_t)Universe::heap()->reserved_region().end() <= OopEncodingHeapMax) {
+ // Did reserve heap below 32Gb. Can use base == 0;
+ Universe::set_narrow_oop_base(0);
+ }
+
+ Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
+
+ LogTarget(Info, gc, heap, coops) lt;
+ if (lt.is_enabled()) {
+ ResourceMark rm;
+ LogStream ls(lt);
+ Universe::print_compressed_oops_mode(&ls);
+ }
+
+ // Tell tests in which mode we run.
+ Arguments::PropertyList_add(new SystemProperty("java.vm.compressedOopsMode",
+ narrow_oop_mode_to_string(narrow_oop_mode()),
+ false));
+ }
+ // Universe::narrow_oop_base() is one page below the heap.
+ assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() -
+ os::vm_page_size()) ||
+ Universe::narrow_oop_base() == NULL, "invalid value");
+ assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes ||
+ Universe::narrow_oop_shift() == 0, "invalid value");
+#endif
+
+ // We will never reach the CATCH below since Exceptions::_throw will cause
+ // the VM to exit if an exception is thrown during initialization
+
+ if (UseTLAB) {
+ assert(Universe::heap()->supports_tlab_allocation(),
+ "Should support thread-local allocation buffers");
+ ThreadLocalAllocBuffer::startup_initialization();
+ }
+ return JNI_OK;
+}
+
+void Universe::print_compressed_oops_mode(outputStream* st) {
+ st->print("Heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
+ p2i(Universe::heap()->base()), Universe::heap()->reserved_region().byte_size()/M);
+
+ st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
+
+ if (Universe::narrow_oop_base() != 0) {
+ st->print(": " PTR_FORMAT, p2i(Universe::narrow_oop_base()));
+ }
+
+ if (Universe::narrow_oop_shift() != 0) {
+ st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
+ }
+
+ if (!Universe::narrow_oop_use_implicit_null_checks()) {
+ st->print(", no protected page in front of the heap");
+ }
+ st->cr();
+}
+
+ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) {
+
+ assert(alignment <= Arguments::conservative_max_heap_alignment(),
+ "actual alignment " SIZE_FORMAT " must be within maximum heap alignment " SIZE_FORMAT,
+ alignment, Arguments::conservative_max_heap_alignment());
+
+ size_t total_reserved = align_up(heap_size, alignment);
+ assert(!UseCompressedOops || (total_reserved <= (OopEncodingHeapMax - os::vm_page_size())),
+ "heap size is too big for compressed oops");
+
+ bool use_large_pages = UseLargePages && is_aligned(alignment, os::large_page_size());
+ assert(!UseLargePages
+ || UseParallelGC
+ || use_large_pages, "Wrong alignment to use large pages");
+
+ // Now create the space.
+ ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages);
+
+ if (total_rs.is_reserved()) {
+ assert((total_reserved == total_rs.size()) && ((uintptr_t)total_rs.base() % alignment == 0),
+ "must be exactly of required size and alignment");
+ // We are good.
+
+ if (UseCompressedOops) {
+ // Universe::initialize_heap() will reset this to NULL if unscaled
+ // or zero-based narrow oops are actually used.
+ // Else heap start and base MUST differ, so that NULL can be encoded nonambigous.
+ Universe::set_narrow_oop_base((address)total_rs.compressed_oop_base());
+ }
+
+ return total_rs;
+ }
+
+ vm_exit_during_initialization(
+ err_msg("Could not reserve enough space for " SIZE_FORMAT "KB object heap",
+ total_reserved/K));
+
+ // satisfy compiler
+ ShouldNotReachHere();
+ return ReservedHeapSpace(0, 0, false);
+}
+
+
+// It's the caller's responsibility to ensure glitch-freedom
+// (if required).
+void Universe::update_heap_info_at_gc() {
+ _heap_capacity_at_last_gc = heap()->capacity();
+ _heap_used_at_last_gc = heap()->used();
+}
+
+
+const char* Universe::narrow_oop_mode_to_string(Universe::NARROW_OOP_MODE mode) {
+ switch (mode) {
+ case UnscaledNarrowOop:
+ return "32-bit";
+ case ZeroBasedNarrowOop:
+ return "Zero based";
+ case DisjointBaseNarrowOop:
+ return "Non-zero disjoint base";
+ case HeapBasedNarrowOop:
+ return "Non-zero based";
+ default:
+ ShouldNotReachHere();
+ return "";
+ }
+}
+
+
+Universe::NARROW_OOP_MODE Universe::narrow_oop_mode() {
+ if (narrow_oop_base_disjoint()) {
+ return DisjointBaseNarrowOop;
+ }
+
+ if (narrow_oop_base() != 0) {
+ return HeapBasedNarrowOop;
+ }
+
+ if (narrow_oop_shift() != 0) {
+ return ZeroBasedNarrowOop;
+ }
+
+ return UnscaledNarrowOop;
+}
+
+void initialize_known_method(LatestMethodCache* method_cache,
+ InstanceKlass* ik,
+ const char* method,
+ Symbol* signature,
+ bool is_static, TRAPS)
+{
+ TempNewSymbol name = SymbolTable::new_symbol(method, CHECK);
+ Method* m = NULL;
+ // The klass must be linked before looking up the method.
+ if (!ik->link_class_or_fail(THREAD) ||
+ ((m = ik->find_method(name, signature)) == NULL) ||
+ is_static != m->is_static()) {
+ ResourceMark rm(THREAD);
+ // NoSuchMethodException doesn't actually work because it tries to run the
+ // <init> function before java_lang_Class is linked. Print error and exit.
+ vm_exit_during_initialization(err_msg("Unable to link/verify %s.%s method",
+ ik->name()->as_C_string(), method));
+ }
+ method_cache->init(ik, m);
+}
+
+void Universe::initialize_known_methods(TRAPS) {
+ // Set up static method for registering finalizers
+ initialize_known_method(_finalizer_register_cache,
+ SystemDictionary::Finalizer_klass(),
+ "register",
+ vmSymbols::object_void_signature(), true, CHECK);
+
+ initialize_known_method(_throw_illegal_access_error_cache,
+ SystemDictionary::internal_Unsafe_klass(),
+ "throwIllegalAccessError",
+ vmSymbols::void_method_signature(), true, CHECK);
+
+ // Set up method for registering loaded classes in class loader vector
+ initialize_known_method(_loader_addClass_cache,
+ SystemDictionary::ClassLoader_klass(),
+ "addClass",
+ vmSymbols::class_void_signature(), false, CHECK);
+
+ // Set up method for checking protection domain
+ initialize_known_method(_pd_implies_cache,
+ SystemDictionary::ProtectionDomain_klass(),
+ "impliesCreateAccessControlContext",
+ vmSymbols::void_boolean_signature(), false, CHECK);
+
+ // Set up method for stack walking
+ initialize_known_method(_do_stack_walk_cache,
+ SystemDictionary::AbstractStackWalker_klass(),
+ "doStackWalk",
+ vmSymbols::doStackWalk_signature(), false, CHECK);
+}
+
+void universe2_init() {
+ EXCEPTION_MARK;
+ Universe::genesis(CATCH);
+}
+
+// Set after initialization of the module runtime, call_initModuleRuntime
+void universe_post_module_init() {
+ Universe::_module_initialized = true;
+}
+
+bool universe_post_init() {
+ assert(!is_init_completed(), "Error: initialization not yet completed!");
+ Universe::_fully_initialized = true;
+ EXCEPTION_MARK;
+ { ResourceMark rm;
+ Interpreter::initialize(); // needed for interpreter entry points
+ if (!UseSharedSpaces) {
+ HandleMark hm(THREAD);
+ Klass* ok = SystemDictionary::Object_klass();
+ Universe::reinitialize_vtable_of(ok, CHECK_false);
+ Universe::reinitialize_itables(CHECK_false);
+ }
+ }
+
+ HandleMark hm(THREAD);
+ // Setup preallocated empty java.lang.Class array
+ Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false);
+
+ // Setup preallocated OutOfMemoryError errors
+ Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false);
+ InstanceKlass* ik = InstanceKlass::cast(k);
+ Universe::_out_of_memory_error_java_heap = ik->allocate_instance(CHECK_false);
+ Universe::_out_of_memory_error_metaspace = ik->allocate_instance(CHECK_false);
+ Universe::_out_of_memory_error_class_metaspace = ik->allocate_instance(CHECK_false);
+ Universe::_out_of_memory_error_array_size = ik->allocate_instance(CHECK_false);
+ Universe::_out_of_memory_error_gc_overhead_limit =
+ ik->allocate_instance(CHECK_false);
+ Universe::_out_of_memory_error_realloc_objects = ik->allocate_instance(CHECK_false);
+
+ // Setup preallocated cause message for delayed StackOverflowError
+ if (StackReservedPages > 0) {
+ Universe::_delayed_stack_overflow_error_message =
+ java_lang_String::create_oop_from_str("Delayed StackOverflowError due to ReservedStackAccess annotated method", CHECK_false);
+ }
+
+ // Setup preallocated NullPointerException
+ // (this is currently used for a cheap & dirty solution in compiler exception handling)
+ k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false);
+ Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
+ // Setup preallocated ArithmeticException
+ // (this is currently used for a cheap & dirty solution in compiler exception handling)
+ k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false);
+ Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
+ // Virtual Machine Error for when we get into a situation we can't resolve
+ k = SystemDictionary::resolve_or_fail(
+ vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false);
+ bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false);
+ if (!linked) {
+ tty->print_cr("Unable to link/verify VirtualMachineError class");
+ return false; // initialization failed
+ }
+ Universe::_virtual_machine_error_instance =
+ InstanceKlass::cast(k)->allocate_instance(CHECK_false);
+
+ Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false);
+
+ if (!DumpSharedSpaces) {
+ // These are the only Java fields that are currently set during shared space dumping.
+ // We prefer to not handle this generally, so we always reinitialize these detail messages.
+ Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false);
+ java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg());
+
+ msg = java_lang_String::create_from_str("Metaspace", CHECK_false);
+ java_lang_Throwable::set_message(Universe::_out_of_memory_error_metaspace, msg());
+ msg = java_lang_String::create_from_str("Compressed class space", CHECK_false);
+ java_lang_Throwable::set_message(Universe::_out_of_memory_error_class_metaspace, msg());
+
+ msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false);
+ java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg());
+
+ msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false);
+ java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg());
+
+ msg = java_lang_String::create_from_str("Java heap space: failed reallocation of scalar replaced objects", CHECK_false);
+ java_lang_Throwable::set_message(Universe::_out_of_memory_error_realloc_objects, msg());
+
+ msg = java_lang_String::create_from_str("/ by zero", CHECK_false);
+ java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg());
+
+ // Setup the array of errors that have preallocated backtrace
+ k = Universe::_out_of_memory_error_java_heap->klass();
+ assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error");
+ ik = InstanceKlass::cast(k);
+
+ int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0;
+ Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(ik, len, CHECK_false);
+ for (int i=0; i<len; i++) {
+ oop err = ik->allocate_instance(CHECK_false);
+ Handle err_h = Handle(THREAD, err);
+ java_lang_Throwable::allocate_backtrace(err_h, CHECK_false);
+ Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h());
+ }
+ Universe::_preallocated_out_of_memory_error_avail_count = (jint)len;
+ }
+
+ Universe::initialize_known_methods(CHECK_false);
+
+ // This needs to be done before the first scavenge/gc, since
+ // it's an input to soft ref clearing policy.
+ {
+ MutexLocker x(Heap_lock);
+ Universe::update_heap_info_at_gc();
+ }
+
+ // ("weak") refs processing infrastructure initialization
+ Universe::heap()->post_initialize();
+
+ // Initialize performance counters for metaspaces
+ MetaspaceCounters::initialize_performance_counters();
+ CompressedClassSpaceCounters::initialize_performance_counters();
+
+ MemoryService::add_metaspace_memory_pools();
+
+ MemoryService::set_universe_heap(Universe::heap());
+#if INCLUDE_CDS
+ SharedClassUtil::initialize(CHECK_false);
+#endif
+ return true;
+}
+
+
+void Universe::compute_base_vtable_size() {
+ _base_vtable_size = ClassLoader::compute_Object_vtable();
+}
+
+void Universe::print_on(outputStream* st) {
+ GCMutexLocker hl(Heap_lock); // Heap_lock might be locked by caller thread.
+ st->print_cr("Heap");
+ heap()->print_on(st);
+}
+
+void Universe::print_heap_at_SIGBREAK() {
+ if (PrintHeapAtSIGBREAK) {
+ print_on(tty);
+ tty->cr();
+ tty->flush();
+ }
+}
+
+void Universe::print_heap_before_gc() {
+ LogTarget(Debug, gc, heap) lt;
+ if (lt.is_enabled()) {
+ LogStream ls(lt);
+ ls.print("Heap before GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
+ ResourceMark rm;
+ heap()->print_on(&ls);
+ }
+}
+
+void Universe::print_heap_after_gc() {
+ LogTarget(Debug, gc, heap) lt;
+ if (lt.is_enabled()) {
+ LogStream ls(lt);
+ ls.print("Heap after GC invocations=%u (full %u):", heap()->total_collections(), heap()->total_full_collections());
+ ResourceMark rm;
+ heap()->print_on(&ls);
+ }
+}
+
+void Universe::initialize_verify_flags() {
+ verify_flags = 0;
+ const char delimiter[] = " ,";
+
+ size_t length = strlen(VerifySubSet);
+ char* subset_list = NEW_C_HEAP_ARRAY(char, length + 1, mtInternal);
+ strncpy(subset_list, VerifySubSet, length + 1);
+
+ char* token = strtok(subset_list, delimiter);
+ while (token != NULL) {
+ if (strcmp(token, "threads") == 0) {
+ verify_flags |= Verify_Threads;
+ } else if (strcmp(token, "heap") == 0) {
+ verify_flags |= Verify_Heap;
+ } else if (strcmp(token, "symbol_table") == 0) {
+ verify_flags |= Verify_SymbolTable;
+ } else if (strcmp(token, "string_table") == 0) {
+ verify_flags |= Verify_StringTable;
+ } else if (strcmp(token, "codecache") == 0) {
+ verify_flags |= Verify_CodeCache;
+ } else if (strcmp(token, "dictionary") == 0) {
+ verify_flags |= Verify_SystemDictionary;
+ } else if (strcmp(token, "classloader_data_graph") == 0) {
+ verify_flags |= Verify_ClassLoaderDataGraph;
+ } else if (strcmp(token, "metaspace") == 0) {
+ verify_flags |= Verify_MetaspaceAux;
+ } else if (strcmp(token, "jni_handles") == 0) {
+ verify_flags |= Verify_JNIHandles;
+ } else if (strcmp(token, "codecache_oops") == 0) {
+ verify_flags |= Verify_CodeCacheOops;
+ } else {
+ vm_exit_during_initialization(err_msg("VerifySubSet: \'%s\' memory sub-system is unknown, please correct it", token));
+ }
+ token = strtok(NULL, delimiter);
+ }
+ FREE_C_HEAP_ARRAY(char, subset_list);
+}
+
+bool Universe::should_verify_subset(uint subset) {
+ if (verify_flags & subset) {
+ return true;
+ }
+ return false;
+}
+
+void Universe::verify(VerifyOption option, const char* prefix) {
+ // The use of _verify_in_progress is a temporary work around for
+ // 6320749. Don't bother with a creating a class to set and clear
+ // it since it is only used in this method and the control flow is
+ // straight forward.
+ _verify_in_progress = true;
+
+ COMPILER2_PRESENT(
+ assert(!DerivedPointerTable::is_active(),
+ "DPT should not be active during verification "
+ "(of thread stacks below)");
+ )
+
+ ResourceMark rm;
+ HandleMark hm; // Handles created during verification can be zapped
+ _verify_count++;
+
+ FormatBuffer<> title("Verifying %s", prefix);
+ GCTraceTime(Info, gc, verify) tm(title.buffer());
+ if (should_verify_subset(Verify_Threads)) {
+ log_debug(gc, verify)("Threads");
+ Threads::verify();
+ }
+ if (should_verify_subset(Verify_Heap)) {
+ log_debug(gc, verify)("Heap");
+ heap()->verify(option);
+ }
+ if (should_verify_subset(Verify_SymbolTable)) {
+ log_debug(gc, verify)("SymbolTable");
+ SymbolTable::verify();
+ }
+ if (should_verify_subset(Verify_StringTable)) {
+ log_debug(gc, verify)("StringTable");
+ StringTable::verify();
+ }
+ if (should_verify_subset(Verify_CodeCache)) {
+ {
+ MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
+ log_debug(gc, verify)("CodeCache");
+ CodeCache::verify();
+ }
+ }
+ if (should_verify_subset(Verify_SystemDictionary)) {
+ log_debug(gc, verify)("SystemDictionary");
+ SystemDictionary::verify();
+ }
+#ifndef PRODUCT
+ if (should_verify_subset(Verify_ClassLoaderDataGraph)) {
+ log_debug(gc, verify)("ClassLoaderDataGraph");
+ ClassLoaderDataGraph::verify();
+ }
+#endif
+ if (should_verify_subset(Verify_MetaspaceAux)) {
+ log_debug(gc, verify)("MetaspaceAux");
+ MetaspaceAux::verify_free_chunks();
+ }
+ if (should_verify_subset(Verify_JNIHandles)) {
+ log_debug(gc, verify)("JNIHandles");
+ JNIHandles::verify();
+ }
+ if (should_verify_subset(Verify_CodeCacheOops)) {
+ log_debug(gc, verify)("CodeCache Oops");
+ CodeCache::verify_oops();
+ }
+
+ _verify_in_progress = false;
+}
+
+
+#ifndef PRODUCT
+void Universe::calculate_verify_data(HeapWord* low_boundary, HeapWord* high_boundary) {
+ assert(low_boundary < high_boundary, "bad interval");
+
+ // decide which low-order bits we require to be clear:
+ size_t alignSize = MinObjAlignmentInBytes;
+ size_t min_object_size = CollectedHeap::min_fill_size();
+
+ // make an inclusive limit:
+ uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize;
+ uintptr_t min = (uintptr_t)low_boundary;
+ assert(min < max, "bad interval");
+ uintptr_t diff = max ^ min;
+
+ // throw away enough low-order bits to make the diff vanish
+ uintptr_t mask = (uintptr_t)(-1);
+ while ((mask & diff) != 0)
+ mask <<= 1;
+ uintptr_t bits = (min & mask);
+ assert(bits == (max & mask), "correct mask");
+ // check an intermediate value between min and max, just to make sure:
+ assert(bits == ((min + (max-min)/2) & mask), "correct mask");
+
+ // require address alignment, too:
+ mask |= (alignSize - 1);
+
+ if (!(_verify_oop_mask == 0 && _verify_oop_bits == (uintptr_t)-1)) {
+ assert(_verify_oop_mask == mask && _verify_oop_bits == bits, "mask stability");
+ }
+ _verify_oop_mask = mask;
+ _verify_oop_bits = bits;
+}
+
+// Oop verification (see MacroAssembler::verify_oop)
+
+uintptr_t Universe::verify_oop_mask() {
+ MemRegion m = heap()->reserved_region();
+ calculate_verify_data(m.start(), m.end());
+ return _verify_oop_mask;
+}
+
+uintptr_t Universe::verify_oop_bits() {
+ MemRegion m = heap()->reserved_region();
+ calculate_verify_data(m.start(), m.end());
+ return _verify_oop_bits;
+}
+
+uintptr_t Universe::verify_mark_mask() {
+ return markOopDesc::lock_mask_in_place;
+}
+
+uintptr_t Universe::verify_mark_bits() {
+ intptr_t mask = verify_mark_mask();
+ intptr_t bits = (intptr_t)markOopDesc::prototype();
+ assert((bits & ~mask) == 0, "no stray header bits");
+ return bits;
+}
+#endif // PRODUCT
+
+
+void Universe::compute_verify_oop_data() {
+ verify_oop_mask();
+ verify_oop_bits();
+ verify_mark_mask();
+ verify_mark_bits();
+}
+
+
+void LatestMethodCache::init(Klass* k, Method* m) {
+ if (!UseSharedSpaces) {
+ _klass = k;
+ }
+#ifndef PRODUCT
+ else {
+ // sharing initilization should have already set up _klass
+ assert(_klass != NULL, "just checking");
+ }
+#endif
+
+ _method_idnum = m->method_idnum();
+ assert(_method_idnum >= 0, "sanity check");
+}
+
+
+Method* LatestMethodCache::get_method() {
+ if (klass() == NULL) return NULL;
+ InstanceKlass* ik = InstanceKlass::cast(klass());
+ Method* m = ik->method_with_idnum(method_idnum());
+ assert(m != NULL, "sanity check");
+ return m;
+}
+
+
+#ifdef ASSERT
+// Release dummy object(s) at bottom of heap
+bool Universe::release_fullgc_alot_dummy() {
+ MutexLocker ml(FullGCALot_lock);
+ if (_fullgc_alot_dummy_array != NULL) {
+ if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) {
+ // No more dummies to release, release entire array instead
+ _fullgc_alot_dummy_array = NULL;
+ return false;
+ }
+ if (!UseConcMarkSweepGC) {
+ // Release dummy at bottom of old generation
+ _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
+ }
+ // Release dummy at bottom of permanent generation
+ _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL);
+ }
+ return true;
+}
+
+#endif // ASSERT