1 /* 2 * Copyright (c) 2019, 2022, 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 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 #include "runtime/threadWXSetters.inline.hpp" 36 37 bool ShenandoahBarrierSetNMethod::nmethod_entry_barrier(nmethod* nm) { 38 if (!is_armed(nm)) { 39 // Some other thread got here first and healed the oops 40 // and disarmed the nmethod. No need to continue. 41 return true; 42 } 43 44 ShenandoahReentrantLock* lock = ShenandoahNMethod::lock_for_nmethod(nm); 45 assert(lock != nullptr, "Must be"); 46 ShenandoahReentrantLocker locker(lock); 47 48 if (!is_armed(nm)) { 49 // Some other thread managed to complete while we were 50 // waiting for lock. No need to continue. 51 return true; 52 } 53 54 MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXWrite, Thread::current());) 55 56 if (nm->is_unloading()) { 57 // We don't need to take the lock when unlinking nmethods from 58 // the Method, because it is only concurrently unlinked by 59 // the entry barrier, which acquires the per nmethod lock. 60 nm->unlink_from_method(); 61 62 // We can end up calling nmethods that are unloading 63 // since we clear compiled ICs lazily. Returning false 64 // will re-resolve the call and update the compiled IC. 65 return false; 66 } 67 68 // Heal oops 69 ShenandoahNMethod::heal_nmethod(nm); 70 71 // CodeCache unloading support 72 nm->mark_as_maybe_on_stack(); 73 74 // Disarm 75 ShenandoahNMethod::disarm_nmethod(nm); 76 return true; 77 }