496 GCTraceTime(Info, gc, phases) tm("Phase 1: Mark live objects", _gc_timer);
497
498 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
499
500 // Need to clear claim bits before the tracing starts.
501 ClassLoaderDataGraph::clear_claimed_marks();
502
503 // General strong roots.
504 {
505 ParallelScavengeHeap::ParStrongRootsScope psrs;
506 Universe::oops_do(mark_and_push_closure());
507 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles
508 MarkingCodeBlobClosure each_active_code_blob(mark_and_push_closure(), !CodeBlobToOopClosure::FixRelocations);
509 Threads::oops_do(mark_and_push_closure(), &each_active_code_blob);
510 ObjectSynchronizer::oops_do(mark_and_push_closure());
511 FlatProfiler::oops_do(mark_and_push_closure());
512 Management::oops_do(mark_and_push_closure());
513 JvmtiExport::oops_do(mark_and_push_closure());
514 SystemDictionary::always_strong_oops_do(mark_and_push_closure());
515 ClassLoaderDataGraph::always_strong_cld_do(follow_cld_closure());
516 // Do not treat nmethods as strong roots for mark/sweep, since we can unload them.
517 //CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure(mark_and_push_closure()));
518 }
519
520 // Flush marking stack.
521 follow_stack();
522
523 // Process reference objects found during marking
524 {
525 GCTraceTime(Debug, gc, phases) t("Reference Processing", _gc_timer);
526
527 ref_processor()->setup_policy(clear_all_softrefs);
528 const ReferenceProcessorStats& stats =
529 ref_processor()->process_discovered_references(
530 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer);
531 gc_tracer()->report_gc_reference_stats(stats);
532 }
533
534 // This is the point where the entire marking should have completed.
535 assert(_marking_stack.is_empty(), "Marking should have completed");
536
537 {
538 GCTraceTime(Debug, gc, phases) t("Class Unloading", _gc_timer);
539
540 // Unload classes and purge the SystemDictionary.
541 bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
542
543 // Unload nmethods.
544 CodeCache::do_unloading(is_alive_closure(), purged_class);
545
546 // Prune dead klasses from subklass/sibling/implementor lists.
547 Klass::clean_weak_klass_links(is_alive_closure());
548 }
549
550 {
551 GCTraceTime(Debug, gc, phases) t("Scrub String Table", _gc_timer);
552 // Delete entries for dead interned strings.
553 StringTable::unlink(is_alive_closure());
554 }
555
556 {
557 GCTraceTime(Debug, gc, phases) t("Scrub Symbol Table", _gc_timer);
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496 GCTraceTime(Info, gc, phases) tm("Phase 1: Mark live objects", _gc_timer);
497
498 ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
499
500 // Need to clear claim bits before the tracing starts.
501 ClassLoaderDataGraph::clear_claimed_marks();
502
503 // General strong roots.
504 {
505 ParallelScavengeHeap::ParStrongRootsScope psrs;
506 Universe::oops_do(mark_and_push_closure());
507 JNIHandles::oops_do(mark_and_push_closure()); // Global (strong) JNI handles
508 MarkingCodeBlobClosure each_active_code_blob(mark_and_push_closure(), !CodeBlobToOopClosure::FixRelocations);
509 Threads::oops_do(mark_and_push_closure(), &each_active_code_blob);
510 ObjectSynchronizer::oops_do(mark_and_push_closure());
511 FlatProfiler::oops_do(mark_and_push_closure());
512 Management::oops_do(mark_and_push_closure());
513 JvmtiExport::oops_do(mark_and_push_closure());
514 SystemDictionary::always_strong_oops_do(mark_and_push_closure());
515 ClassLoaderDataGraph::always_strong_cld_do(follow_cld_closure());
516 // Treat nmethods as strong roots for mark/sweep if we don't intend to unload them.
517 if (!ClassUnloading) {
518 CodeBlobToOopClosure cl(mark_and_push_closure(), false);
519 CodeCache::scavenge_root_nmethods_do(&cl);
520 }
521 }
522
523 // Flush marking stack.
524 follow_stack();
525
526 // Process reference objects found during marking
527 {
528 GCTraceTime(Debug, gc, phases) t("Reference Processing", _gc_timer);
529
530 ref_processor()->setup_policy(clear_all_softrefs);
531 const ReferenceProcessorStats& stats =
532 ref_processor()->process_discovered_references(
533 is_alive_closure(), mark_and_push_closure(), follow_stack_closure(), NULL, _gc_timer);
534 gc_tracer()->report_gc_reference_stats(stats);
535 }
536
537 // This is the point where the entire marking should have completed.
538 assert(_marking_stack.is_empty(), "Marking should have completed");
539
540 if (ClassUnloading) {
541 GCTraceTime(Debug, gc, phases) t("Class Unloading", _gc_timer);
542
543 // Unload classes and purge the SystemDictionary.
544 bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
545
546 // Unload nmethods.
547 CodeCache::do_unloading(is_alive_closure(), purged_class);
548
549 // Prune dead klasses from subklass/sibling/implementor lists.
550 Klass::clean_weak_klass_links(is_alive_closure());
551 }
552
553 {
554 GCTraceTime(Debug, gc, phases) t("Scrub String Table", _gc_timer);
555 // Delete entries for dead interned strings.
556 StringTable::unlink(is_alive_closure());
557 }
558
559 {
560 GCTraceTime(Debug, gc, phases) t("Scrub Symbol Table", _gc_timer);
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