--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/g1/g1FullCollector.cpp	Tue Nov 14 11:33:23 2017 +0100
@@ -0,0 +1,245 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "code/codeCache.hpp"
+#include "gc/g1/g1CollectedHeap.hpp"
+#include "gc/g1/g1CollectorPolicy.hpp"
+#include "gc/g1/g1FullCollector.hpp"
+#include "gc/g1/g1FullGCAdjustTask.hpp"
+#include "gc/g1/g1FullGCCompactTask.hpp"
+#include "gc/g1/g1FullGCMarker.inline.hpp"
+#include "gc/g1/g1FullGCMarkTask.hpp"
+#include "gc/g1/g1FullGCPrepareTask.hpp"
+#include "gc/g1/g1FullGCReferenceProcessorExecutor.hpp"
+#include "gc/g1/g1FullGCScope.hpp"
+#include "gc/g1/g1OopClosures.hpp"
+#include "gc/g1/g1StringDedup.hpp"
+#include "gc/shared/gcTraceTime.inline.hpp"
+#include "gc/shared/preservedMarks.hpp"
+#include "gc/shared/referenceProcessor.hpp"
+#include "gc/shared/weakProcessor.hpp"
+#include "logging/log.hpp"
+#include "runtime/biasedLocking.hpp"
+#include "utilities/debug.hpp"
+
+static void clear_and_activate_derived_pointers() {
+#if COMPILER2_OR_JVMCI
+  DerivedPointerTable::clear();
+#endif
+}
+
+static void deactivate_derived_pointers() {
+#if COMPILER2_OR_JVMCI
+  DerivedPointerTable::set_active(false);
+#endif
+}
+
+static void update_derived_pointers() {
+#if COMPILER2_OR_JVMCI
+  DerivedPointerTable::update_pointers();
+#endif
+}
+
+G1FullCollector::G1FullCollector(G1FullGCScope* scope,
+                                 ReferenceProcessor* reference_processor,
+                                 G1CMBitMap* bitmap,
+                                 uint workers) :
+    _scope(scope),
+    _num_workers(workers),
+    _mark_bitmap(bitmap),
+    _oop_queue_set(_num_workers),
+    _array_queue_set(_num_workers),
+    _preserved_marks_set(true),
+    _reference_processor(reference_processor),
+    _serial_compaction_point(),
+    _is_alive(_mark_bitmap),
+    _is_alive_mutator(_reference_processor, &_is_alive) {
+  assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
+
+  _preserved_marks_set.init(_num_workers);
+  _markers = NEW_C_HEAP_ARRAY(G1FullGCMarker*, _num_workers, mtGC);
+  _compaction_points = NEW_C_HEAP_ARRAY(G1FullGCCompactionPoint*, _num_workers, mtGC);
+  for (uint i = 0; i < _num_workers; i++) {
+    _markers[i] = new G1FullGCMarker(i, _preserved_marks_set.get(i), mark_bitmap());
+    _compaction_points[i] = new G1FullGCCompactionPoint();
+    _oop_queue_set.register_queue(i, marker(i)->oop_stack());
+    _array_queue_set.register_queue(i, marker(i)->objarray_stack());
+  }
+}
+
+G1FullCollector::~G1FullCollector() {
+  for (uint i = 0; i < _num_workers; i++) {
+    delete _markers[i];
+    delete _compaction_points[i];
+  }
+  FREE_C_HEAP_ARRAY(G1FullGCMarker*, _markers);
+  FREE_C_HEAP_ARRAY(G1FullGCCompactionPoint*, _compaction_points);
+}
+
+void G1FullCollector::prepare_collection() {
+  _reference_processor->enable_discovery();
+  _reference_processor->setup_policy(scope()->should_clear_soft_refs());
+
+  // When collecting the permanent generation Method*s may be moving,
+  // so we either have to flush all bcp data or convert it into bci.
+  CodeCache::gc_prologue();
+
+  // We should save the marks of the currently locked biased monitors.
+  // The marking doesn't preserve the marks of biased objects.
+  BiasedLocking::preserve_marks();
+
+  // Clear and activate derived pointer collection.
+  clear_and_activate_derived_pointers();
+}
+
+void G1FullCollector::collect() {
+  phase1_mark_live_objects();
+  verify_after_marking();
+
+  // Don't add any more derived pointers during later phases
+  deactivate_derived_pointers();
+
+  phase2_prepare_compaction();
+
+  phase3_adjust_pointers();
+
+  phase4_do_compaction();
+}
+
+void G1FullCollector::complete_collection() {
+  // Restore all marks.
+  restore_marks();
+
+  // When the pointers have been adjusted and moved, we can
+  // update the derived pointer table.
+  update_derived_pointers();
+
+  BiasedLocking::restore_marks();
+  CodeCache::gc_epilogue();
+  JvmtiExport::gc_epilogue();
+}
+
+void G1FullCollector::phase1_mark_live_objects() {
+  // Recursively traverse all live objects and mark them.
+  GCTraceTime(Info, gc, phases) info("Phase 1: Mark live objects", scope()->timer());
+
+  // Do the actual marking.
+  G1FullGCMarkTask marking_task(this);
+  run_task(&marking_task);
+
+  // Process references discovered during marking.
+  G1FullGCReferenceProcessingExecutor reference_processing(this);
+  reference_processing.execute(scope()->timer(), scope()->tracer());
+
+  // Weak oops cleanup.
+  {
+    GCTraceTime(Debug, gc, phases) trace("Phase 1: Weak Processing", scope()->timer());
+    WeakProcessor::weak_oops_do(&_is_alive, &do_nothing_cl);
+  }
+
+  // Class unloading and cleanup.
+  if (ClassUnloading) {
+    GCTraceTime(Debug, gc, phases) debug("Phase 1: Class Unloading and Cleanup", scope()->timer());
+    // Unload classes and purge the SystemDictionary.
+    bool purged_class = SystemDictionary::do_unloading(&_is_alive, scope()->timer());
+    G1CollectedHeap::heap()->complete_cleaning(&_is_alive, purged_class);
+  } else {
+    GCTraceTime(Debug, gc, phases) debug("Phase 1: String and Symbol Tables Cleanup", scope()->timer());
+    // If no class unloading just clean out strings and symbols.
+    G1CollectedHeap::heap()->partial_cleaning(&_is_alive, true, true, G1StringDedup::is_enabled());
+  }
+
+  scope()->tracer()->report_object_count_after_gc(&_is_alive);
+}
+
+void G1FullCollector::prepare_compaction_common() {
+  G1FullGCPrepareTask task(this);
+  run_task(&task);
+
+  // To avoid OOM when there is memory left.
+  if (!task.has_freed_regions()) {
+    task.prepare_serial_compaction();
+  }
+}
+
+void G1FullCollector::phase2_prepare_compaction() {
+  GCTraceTime(Info, gc, phases) info("Phase 2: Prepare for compaction", scope()->timer());
+  prepare_compaction_ext(); // Will call prepare_compaction_common() above.
+}
+
+void G1FullCollector::phase3_adjust_pointers() {
+  // Adjust the pointers to reflect the new locations
+  GCTraceTime(Info, gc, phases) info("Phase 3: Adjust pointers and remembered sets", scope()->timer());
+
+  G1FullGCAdjustTask task(this);
+  run_task(&task);
+}
+
+void G1FullCollector::phase4_do_compaction() {
+  // Compact the heap using the compaction queues created in phase 2.
+  GCTraceTime(Info, gc, phases) info("Phase 4: Compact heap", scope()->timer());
+  G1FullGCCompactTask task(this);
+  run_task(&task);
+
+  // Serial compact to avoid OOM when very few free regions.
+  if (serial_compaction_point()->has_regions()) {
+    task.serial_compaction();
+  }
+}
+
+void G1FullCollector::restore_marks() {
+  SharedRestorePreservedMarksTaskExecutor task_executor(G1CollectedHeap::heap()->workers());
+  _preserved_marks_set.restore(&task_executor);
+  _preserved_marks_set.reclaim();
+}
+
+void G1FullCollector::run_task(AbstractGangTask* task) {
+  G1CollectedHeap::heap()->workers()->run_task(task, _num_workers);
+}
+
+void G1FullCollector::verify_after_marking() {
+  if (!VerifyDuringGC) {
+    //Only do verification if VerifyDuringGC is set.
+    return;
+  }
+
+  HandleMark hm;  // handle scope
+#if COMPILER2_OR_JVMCI
+  DerivedPointerTableDeactivate dpt_deact;
+#endif
+  G1CollectedHeap::heap()->prepare_for_verify();
+  // Note: we can verify only the heap here. When an object is
+  // marked, the previous value of the mark word (including
+  // identity hash values, ages, etc) is preserved, and the mark
+  // word is set to markOop::marked_value - effectively removing
+  // any hash values from the mark word. These hash values are
+  // used when verifying the dictionaries and so removing them
+  // from the mark word can make verification of the dictionaries
+  // fail. At the end of the GC, the original mark word values
+  // (including hash values) are restored to the appropriate
+  // objects.
+  GCTraceTime(Info, gc, verify)("During GC (full)");
+  G1CollectedHeap::heap()->verify(VerifyOption_G1UseFullMarking);
+}