1 /*
  2  * Copyright (c) 2013, 2021, 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/shenandoahConcurrentGC.hpp"
 28 #include "gc/shenandoah/shenandoahDegeneratedGC.hpp"
 29 #include "gc/shenandoah/shenandoahFullGC.hpp"
 30 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
 31 #include "gc/shenandoah/shenandoahMark.inline.hpp"
 32 #include "gc/shenandoah/shenandoahOopClosures.inline.hpp"
 33 #include "gc/shenandoah/shenandoahUtils.hpp"
 34 #include "gc/shenandoah/shenandoahVMOperations.hpp"
 35 #include "interpreter/oopMapCache.hpp"
 36 #include "memory/universe.hpp"
 37 
 38 bool VM_ShenandoahOperation::doit_prologue() {
 39   assert(!ShenandoahHeap::heap()->has_gc_state_changed(), "GC State can only be changed on a safepoint.");
 40   return true;
 41 }
 42 
 43 void VM_ShenandoahOperation::doit_epilogue() {
 44   assert(!ShenandoahHeap::heap()->has_gc_state_changed(), "GC State was not synchronized to java threads.");
 45   // GC thread root traversal likely used OopMapCache a lot, which
 46   // might have created lots of old entries. Trigger the cleanup now.
 47   OopMapCache::trigger_cleanup();
 48 }
 49 
 50 bool VM_ShenandoahReferenceOperation::doit_prologue() {
 51   VM_ShenandoahOperation::doit_prologue();
 52   Heap_lock->lock();
 53   return true;
 54 }
 55 
 56 void VM_ShenandoahReferenceOperation::doit_epilogue() {
 57   VM_ShenandoahOperation::doit_epilogue();
 58   if (Universe::has_reference_pending_list()) {
 59     Heap_lock->notify_all();
 60   }
 61   Heap_lock->unlock();
 62 }
 63 
 64 void VM_ShenandoahInitMark::doit() {
 65   ShenandoahGCPauseMark mark(_gc_id, "Init Mark", SvcGCMarker::CONCURRENT);
 66   _gc->entry_init_mark();
 67   ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
 68 }
 69 
 70 void VM_ShenandoahFinalMarkStartEvac::doit() {
 71   ShenandoahGCPauseMark mark(_gc_id, "Final Mark", SvcGCMarker::CONCURRENT);
 72   _gc->entry_final_mark();
 73   ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
 74 }
 75 
 76 void VM_ShenandoahFullGC::doit() {
 77   ShenandoahGCPauseMark mark(_gc_id, "Full GC", SvcGCMarker::FULL);
 78   _full_gc->entry_full(_gc_cause);
 79   ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
 80 }
 81 
 82 void VM_ShenandoahDegeneratedGC::doit() {
 83   ShenandoahGCPauseMark mark(_gc_id, "Degenerated GC", SvcGCMarker::CONCURRENT);
 84   _gc->entry_degenerated();
 85   ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
 86 }
 87 
 88 void VM_ShenandoahInitUpdateRefs::doit() {
 89   ShenandoahGCPauseMark mark(_gc_id, "Init Update Refs", SvcGCMarker::CONCURRENT);
 90   _gc->entry_init_updaterefs();
 91   ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
 92 }
 93 
 94 void VM_ShenandoahFinalUpdateRefs::doit() {
 95   ShenandoahGCPauseMark mark(_gc_id, "Final Update Refs", SvcGCMarker::CONCURRENT);
 96   _gc->entry_final_updaterefs();
 97   ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
 98 }
 99 
100 void VM_ShenandoahFinalRoots::doit() {
101   ShenandoahGCPauseMark mark(_gc_id, "Final Roots", SvcGCMarker::CONCURRENT);
102   _gc->entry_final_roots();
103   ShenandoahHeap::heap()->propagate_gc_state_to_java_threads();
104 }