1 /*
2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. 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 #include "classfile/javaClasses.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/icBuffer.hpp"
32 #include "gc_implementation/g1/g1Log.hpp"
33 #include "gc_implementation/g1/g1MarkSweep.hpp"
34 #include "gc_implementation/shared/gcHeapSummary.hpp"
35 #include "gc_implementation/shared/gcTimer.hpp"
36 #include "gc_implementation/shared/gcTrace.hpp"
37 #include "gc_implementation/shared/gcTraceTime.hpp"
38 #include "memory/gcLocker.hpp"
39 #include "memory/genCollectedHeap.hpp"
40 #include "memory/modRefBarrierSet.hpp"
41 #include "memory/referencePolicy.hpp"
42 #include "memory/space.hpp"
43 #include "oops/instanceRefKlass.hpp"
44 #include "oops/oop.inline.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "runtime/biasedLocking.hpp"
47 #include "runtime/fprofiler.hpp"
48 #include "runtime/synchronizer.hpp"
49 #include "runtime/thread.hpp"
50 #include "runtime/vmThread.hpp"
51 #include "utilities/copy.hpp"
52 #include "utilities/events.hpp"
53
299 GCTraceTime tm("phase 3", G1Log::fine() && Verbose, true, gc_timer());
300 GenMarkSweep::trace("3");
301
302 SharedHeap* sh = SharedHeap::heap();
303
304 // Need cleared claim bits for the strong roots processing
305 ClassLoaderDataGraph::clear_claimed_marks();
306
307 sh->process_strong_roots(true, // activate StrongRootsScope
308 SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_AllCodeCache,
309 &GenMarkSweep::adjust_pointer_closure,
310 &GenMarkSweep::adjust_klass_closure);
311
312 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity");
313 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_pointer_closure);
314
315 // Now adjust pointers in remaining weak roots. (All of which should
316 // have been cleared if they pointed to non-surviving objects.)
317 sh->process_weak_roots(&GenMarkSweep::adjust_pointer_closure);
318
319 GenMarkSweep::adjust_marks();
320
321 G1AdjustPointersClosure blk;
322 g1h->heap_region_iterate(&blk);
323 }
324
325 class G1SpaceCompactClosure: public HeapRegionClosure {
326 public:
327 G1SpaceCompactClosure() {}
328
329 bool doHeapRegion(HeapRegion* hr) {
330 if (hr->isHumongous()) {
331 if (hr->startsHumongous()) {
332 oop obj = oop(hr->bottom());
333 if (obj->is_gc_marked()) {
334 obj->init_mark();
335 } else {
336 assert(hr->is_empty(), "Should have been cleared in phase 2.");
337 }
338 hr->reset_during_compaction();
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1 /*
2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. 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 #include "classfile/javaClasses.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/icBuffer.hpp"
32 #include "gc_implementation/g1/g1Log.hpp"
33 #include "gc_implementation/g1/g1MarkSweep.hpp"
34 #include "gc_implementation/g1/g1StringDedup.hpp"
35 #include "gc_implementation/shared/gcHeapSummary.hpp"
36 #include "gc_implementation/shared/gcTimer.hpp"
37 #include "gc_implementation/shared/gcTrace.hpp"
38 #include "gc_implementation/shared/gcTraceTime.hpp"
39 #include "memory/gcLocker.hpp"
40 #include "memory/genCollectedHeap.hpp"
41 #include "memory/modRefBarrierSet.hpp"
42 #include "memory/referencePolicy.hpp"
43 #include "memory/space.hpp"
44 #include "oops/instanceRefKlass.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "runtime/biasedLocking.hpp"
48 #include "runtime/fprofiler.hpp"
49 #include "runtime/synchronizer.hpp"
50 #include "runtime/thread.hpp"
51 #include "runtime/vmThread.hpp"
52 #include "utilities/copy.hpp"
53 #include "utilities/events.hpp"
54
300 GCTraceTime tm("phase 3", G1Log::fine() && Verbose, true, gc_timer());
301 GenMarkSweep::trace("3");
302
303 SharedHeap* sh = SharedHeap::heap();
304
305 // Need cleared claim bits for the strong roots processing
306 ClassLoaderDataGraph::clear_claimed_marks();
307
308 sh->process_strong_roots(true, // activate StrongRootsScope
309 SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_AllCodeCache,
310 &GenMarkSweep::adjust_pointer_closure,
311 &GenMarkSweep::adjust_klass_closure);
312
313 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity");
314 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_pointer_closure);
315
316 // Now adjust pointers in remaining weak roots. (All of which should
317 // have been cleared if they pointed to non-surviving objects.)
318 sh->process_weak_roots(&GenMarkSweep::adjust_pointer_closure);
319
320 if (G1StringDedup::is_enabled()) {
321 G1StringDedup::oops_do(&GenMarkSweep::adjust_pointer_closure);
322 }
323
324 GenMarkSweep::adjust_marks();
325
326 G1AdjustPointersClosure blk;
327 g1h->heap_region_iterate(&blk);
328 }
329
330 class G1SpaceCompactClosure: public HeapRegionClosure {
331 public:
332 G1SpaceCompactClosure() {}
333
334 bool doHeapRegion(HeapRegion* hr) {
335 if (hr->isHumongous()) {
336 if (hr->startsHumongous()) {
337 oop obj = oop(hr->bottom());
338 if (obj->is_gc_marked()) {
339 obj->init_mark();
340 } else {
341 assert(hr->is_empty(), "Should have been cleared in phase 2.");
342 }
343 hr->reset_during_compaction();
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