1 /* 2 * Copyright (c) 2019, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #include "precompiled.hpp" 25 26 #include "gc/shenandoah/shenandoahBarrierSetNMethod.hpp" 27 #include "gc/shenandoah/shenandoahClosures.inline.hpp" 28 #include "gc/shenandoah/shenandoahCodeRoots.hpp" 29 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 30 #include "gc/shenandoah/shenandoahLock.hpp" 31 #include "gc/shenandoah/shenandoahNMethod.inline.hpp" 32 #include "gc/shenandoah/shenandoahThreadLocalData.hpp" 33 #include "memory/iterator.hpp" 34 #include "memory/resourceArea.hpp" 35 36 bool ShenandoahBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) { 37 ShenandoahReentrantLock* lock = ShenandoahNMethod::lock_for_nmethod(nm); 38 assert(lock != NULL, "Must be"); 39 ShenandoahReentrantLocker locker(lock); 40 41 if (!is_armed(nm)) { 42 // Some other thread got here first and healed the oops 43 // and disarmed the nmethod. 44 return true; 45 } 46 47 if (nm->is_unloading()) { 48 // We don't need to take the lock when unlinking nmethods from 49 // the Method, because it is only concurrently unlinked by 50 // the entry barrier, which acquires the per nmethod lock. 51 nm->unlink_from_method(); 52 53 // We can end up calling nmethods that are unloading 54 // since we clear compiled ICs lazily. Returning false 55 // will re-resovle the call and update the compiled IC. 56 return false; 57 } 58 59 // Heal oops and disarm 60 ShenandoahEvacOOMScope scope; 61 ShenandoahNMethod::heal_nmethod(nm); 62 ShenandoahNMethod::disarm_nmethod(nm); 63 return true; 64 } 65 66 int ShenandoahBarrierSetNMethod::disarmed_value() const { 67 return ShenandoahCodeRoots::disarmed_value(); 68 } 69 70 ByteSize ShenandoahBarrierSetNMethod::thread_disarmed_offset() const { 71 return ShenandoahThreadLocalData::disarmed_value_offset(); 72 } 73 74 int* ShenandoahBarrierSetNMethod::disarmed_value_address() const { 75 return ShenandoahCodeRoots::disarmed_value_address(); 76 }