1 /* 2 * Copyright (c) 2019, 2020, Red Hat, Inc. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 27 #include "gc/shenandoah/shenandoahBarrierSet.hpp" 28 #include "gc/shenandoah/shenandoahBarrierSetNMethod.hpp" 29 #include "gc/shenandoah/shenandoahClosures.inline.hpp" 30 #include "gc/shenandoah/shenandoahCodeRoots.hpp" 31 #include "gc/shenandoah/shenandoahHeap.inline.hpp" 32 #include "gc/shenandoah/shenandoahLock.hpp" 33 #include "gc/shenandoah/shenandoahNMethod.inline.hpp" 34 #include "gc/shenandoah/shenandoahThreadLocalData.hpp" 35 #include "memory/iterator.hpp" 36 #include "memory/resourceArea.hpp" 37 38 bool ShenandoahBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) { 39 ShenandoahReentrantLock* lock = ShenandoahNMethod::lock_for_nmethod(nm); 40 assert(lock != NULL, "Must be"); 41 ShenandoahReentrantLocker locker(lock); 42 43 if (!is_armed(nm)) { 44 // Some other thread got here first and healed the oops 45 // and disarmed the nmethod. 46 return true; 47 } 48 49 // Mark phase nmethod barrier, keep the nmethod metadata alive 50 if (ShenandoahHeap::heap()->is_concurrent_mark_in_progress()) { 51 ShenandoahNMethod::keep_metadata_alive(nm); 52 ShenandoahNMethod::disarm_nmethod(nm); 53 return true; 54 } 55 56 ShenandoahHeap* const heap = ShenandoahHeap::heap(); 57 58 assert(heap->is_concurrent_root_in_progress(), "What else?"); 59 if (nm->is_unloading()) { 60 // We don't need to take the lock when unlinking nmethods from 61 // the Method, because it is only concurrently unlinked by 62 // the entry barrier, which acquires the per nmethod lock. 63 nm->unlink_from_method(); 64 65 // We can end up calling nmethods that are unloading 66 // since we clear compiled ICs lazily. Returning false 67 // will re-resovle the call and update the compiled IC. 68 return false; 69 } 70 71 // Heal oops and disarm 72 ShenandoahNMethod::heal_nmethod(nm); 73 ShenandoahNMethod::disarm_nmethod(nm); 74 return true; 75 } 76 77 int ShenandoahBarrierSetNMethod::disarmed_value() const { 78 return ShenandoahCodeRoots::disarmed_value(); 79 } 80 81 ByteSize ShenandoahBarrierSetNMethod::thread_disarmed_offset() const { 82 return ShenandoahThreadLocalData::disarmed_value_offset(); 83 } 84 85 int* ShenandoahBarrierSetNMethod::disarmed_value_address() const { 86 return ShenandoahCodeRoots::disarmed_value_address(); 87 }