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8256425: Obsolete Biased Locking in JDK 18

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Reviewed-by: kvn, dholmes, dcubed, rrich
This commit is contained in:
Patricio Chilano Mateo 2021-06-24 18:54:41 +00:00
parent 595446bff4
commit 2fd7943ec1
165 changed files with 293 additions and 5261 deletions
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13
src/hotspot/share/oops/instanceKlass.cpp
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@ -75,7 +75,6 @@
#include "prims/methodComparator.hpp"
#include "runtime/arguments.hpp"
#include "runtime/atomic.hpp"
#include "runtime/biasedLocking.hpp"
#include "runtime/fieldDescriptor.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/javaCalls.hpp"
@ -508,12 +507,6 @@ InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, Klass
assert(NULL == _methods, "underlying memory not zeroed?");
assert(is_instance_klass(), "is layout incorrect?");
assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
// Set biased locking bit for all instances of this class; it will be
// cleared if revocation occurs too often for this type
if (UseBiasedLocking && BiasedLocking::enabled()) {
set_prototype_header(markWord::biased_locking_prototype());
}
}
void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
@ -2530,15 +2523,9 @@ void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handl
array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
}
// Initialize current biased locking state.
if (UseBiasedLocking && BiasedLocking::enabled()) {
set_prototype_header(markWord::biased_locking_prototype());
}
// Initialize @ValueBased class annotation
if (DiagnoseSyncOnValueBasedClasses && has_value_based_class_annotation()) {
set_is_value_based();
set_prototype_header(markWord::prototype());
}
}