75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
/*
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* Copyright (c) 2018, 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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*
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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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*
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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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*
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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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*
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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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* questions.
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*/
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#include "precompiled.hpp"
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#include "code/nmethod.hpp"
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#include "gc/z/zBarrierSetNMethod.hpp"
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#include "gc/z/zGlobals.hpp"
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#include "gc/z/zLock.inline.hpp"
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#include "gc/z/zOopClosures.hpp"
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#include "gc/z/zNMethod.hpp"
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#include "gc/z/zThreadLocalData.hpp"
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#include "logging/log.hpp"
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bool ZBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) {
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ZLocker<ZReentrantLock> locker(ZNMethod::lock_for_nmethod(nm));
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log_trace(nmethod, barrier)("Entered critical zone for %p", nm);
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if (!is_armed(nm)) {
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// Some other thread got here first and healed the oops
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// and disarmed the nmethod.
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return true;
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}
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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(false /* acquire_lock */);
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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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return false;
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}
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// Heal oops and disarm
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ZNMethodOopClosure cl;
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ZNMethod::nmethod_oops_do(nm, &cl);
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disarm(nm);
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return true;
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}
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int ZBarrierSetNMethod::disarmed_value() const {
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// We override the default BarrierSetNMethod::disarmed_value() since
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// this can be called by GC threads, which doesn't keep an up to date
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// address_bad_mask.
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const uintptr_t disarmed_addr = ((uintptr_t)&ZAddressBadMask) + ZNMethodDisarmedOffset;
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return *((int*)disarmed_addr);
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}
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ByteSize ZBarrierSetNMethod::thread_disarmed_offset() const {
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return ZThreadLocalData::nmethod_disarmed_offset();
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}
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