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* Copyright (c) 2018, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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#include "precompiled.hpp"
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#include "code/nmethod.hpp"
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#include "gc/x/xBarrierSetNMethod.hpp"
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#include "gc/x/xGlobals.hpp"
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#include "gc/x/xLock.inline.hpp"
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#include "gc/x/xNMethod.hpp"
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#include "gc/x/xThreadLocalData.hpp"
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#include "logging/log.hpp"
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#include "runtime/threadWXSetters.inline.hpp"
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bool XBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) {
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// Some other thread got here first and healed the oops
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// and disarmed the nmethod. No need to continue.
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XLocker<XReentrantLock> locker(XNMethod::lock_for_nmethod(nm));
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log_trace(nmethod, barrier)("Entered critical zone for %p", nm);
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// Some other thread managed to complete while we were
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// waiting for lock. No need to continue.
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MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, Thread::current()));
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if (nm->is_unloading()) {
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// We don't need to take the lock when unlinking nmethods from
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// the Method, because it is only concurrently unlinked by
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// the entry barrier, which acquires the per nmethod lock.
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nm->unlink_from_method();
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// We can end up calling nmethods that are unloading
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// since we clear compiled ICs lazily. Returning false
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// will re-resovle the call and update the compiled IC.
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XNMethod::nmethod_oops_barrier(nm);
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// CodeCache unloading support
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nm->mark_as_maybe_on_stack();
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int* XBarrierSetNMethod::disarmed_guard_value_address() const {
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return (int*)XAddressBadMaskHighOrderBitsAddr;
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ByteSize XBarrierSetNMethod::thread_disarmed_guard_value_offset() const {
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return XThreadLocalData::nmethod_disarmed_offset();