src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.inline.hpp
author zgu
Mon, 20 May 2019 09:42:37 -0400
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child 54976 b1f070f4a4ae
permissions -rw-r--r--
8224210: Shenandoah: Refactor ShenandoahRootScanner to support scanning CSet codecache roots Reviewed-by: shade
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/*
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 * Copyright (c) 2019, Red Hat, Inc. All rights reserved.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_INLINE_HPP
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#define SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_INLINE_HPP
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#include "gc/shenandoah/shenandoahHeuristics.hpp"
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#include "gc/shenandoah/shenandoahRootProcessor.hpp"
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#include "gc/shenandoah/shenandoahTimingTracker.hpp"
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template <typename IsAlive, typename KeepAlive>
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void ShenandoahWeakRoots::oops_do(IsAlive* is_alive, KeepAlive* keep_alive, uint worker_id) {
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  _task.work<IsAlive, KeepAlive>(worker_id, is_alive, keep_alive);
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}
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template <typename ITR>
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ShenandoahCodeCacheRoots<ITR>::ShenandoahCodeCacheRoots() {
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  nmethod::oops_do_marking_prologue();
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}
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template <typename ITR>
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void ShenandoahCodeCacheRoots<ITR>::code_blobs_do(CodeBlobClosure* blob_cl, uint worker_id) {
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  ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();
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  ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::CodeCacheRoots, worker_id);
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  _coderoots_iterator.possibly_parallel_blobs_do(blob_cl);
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}
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template <typename ITR>
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ShenandoahCodeCacheRoots<ITR>::~ShenandoahCodeCacheRoots() {
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  nmethod::oops_do_marking_epilogue();
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}
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class ShenandoahParallelOopsDoThreadClosure : public ThreadClosure {
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private:
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  OopClosure* _f;
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  CodeBlobClosure* _cf;
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  ThreadClosure* _thread_cl;
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public:
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  ShenandoahParallelOopsDoThreadClosure(OopClosure* f, CodeBlobClosure* cf, ThreadClosure* thread_cl) :
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    _f(f), _cf(cf), _thread_cl(thread_cl) {}
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  void do_thread(Thread* t) {
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    if (_thread_cl != NULL) {
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      _thread_cl->do_thread(t);
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    }
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    t->oops_do(_f, _cf);
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  }
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};
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template <typename ITR>
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ShenandoahRootScanner<ITR>::ShenandoahRootScanner(uint n_workers, ShenandoahPhaseTimings::Phase phase) :
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  ShenandoahRootProcessor(phase),
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  _thread_roots(n_workers > 1) {
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}
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template <typename ITR>
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void ShenandoahRootScanner<ITR>::roots_do(uint worker_id, OopClosure* oops) {
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  CLDToOopClosure clds_cl(oops, ClassLoaderData::_claim_strong);
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  MarkingCodeBlobClosure blobs_cl(oops, !CodeBlobToOopClosure::FixRelocations);
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  roots_do(worker_id, oops, &clds_cl, &blobs_cl);
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}
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template <typename ITR>
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void ShenandoahRootScanner<ITR>::strong_roots_do(uint worker_id, OopClosure* oops) {
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  CLDToOopClosure clds_cl(oops, ClassLoaderData::_claim_strong);
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  MarkingCodeBlobClosure blobs_cl(oops, !CodeBlobToOopClosure::FixRelocations);
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  strong_roots_do(worker_id, oops, &clds_cl, &blobs_cl);
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}
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template <typename ITR>
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void ShenandoahRootScanner<ITR>::roots_do(uint worker_id, OopClosure* oops, CLDClosure* clds, CodeBlobClosure* code, ThreadClosure *tc) {
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  assert(!ShenandoahHeap::heap()->unload_classes() ||
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          ShenandoahHeap::heap()->heuristics()->can_do_traversal_gc(),
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          "No class unloading or traversal GC");
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  ShenandoahParallelOopsDoThreadClosure tc_cl(oops, code, tc);
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  ResourceMark rm;
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  _serial_roots.oops_do(oops, worker_id);
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  _cld_roots.clds_do(clds, clds, worker_id);
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  _thread_roots.threads_do(&tc_cl, worker_id);
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  // With ShenandoahConcurrentScanCodeRoots, we avoid scanning the entire code cache here,
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  // and instead do that in concurrent phase under the relevant lock. This saves init mark
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  // pause time.
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  if (code != NULL && !ShenandoahConcurrentScanCodeRoots) {
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    _code_roots.code_blobs_do(code, worker_id);
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  }
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}
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template <typename ITR>
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void ShenandoahRootScanner<ITR>::strong_roots_do(uint worker_id, OopClosure* oops, CLDClosure* clds, CodeBlobClosure* code, ThreadClosure* tc) {
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  assert(ShenandoahHeap::heap()->unload_classes(), "Should be used during class unloading");
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  ShenandoahParallelOopsDoThreadClosure tc_cl(oops, code, tc);
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  ResourceMark rm;
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  _serial_roots.oops_do(oops, worker_id);
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  _cld_roots.clds_do(clds, NULL, worker_id);
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  _thread_roots.threads_do(&tc_cl, worker_id);
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}
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template <typename IsAlive, typename KeepAlive>
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void ShenandoahRootUpdater::roots_do(uint worker_id, IsAlive* is_alive, KeepAlive* keep_alive) {
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  CodeBlobToOopClosure update_blobs(keep_alive, CodeBlobToOopClosure::FixRelocations);
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  CLDToOopClosure clds(keep_alive, ClassLoaderData::_claim_strong);
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  CLDToOopClosure* weak_clds = ShenandoahHeap::heap()->unload_classes() ? NULL : &clds;
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  _serial_roots.oops_do(keep_alive, worker_id);
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  _thread_roots.oops_do(keep_alive, NULL, worker_id);
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  _cld_roots.clds_do(&clds, weak_clds, worker_id);
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  if(_update_code_cache) {
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    _code_roots.code_blobs_do(&update_blobs, worker_id);
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  }
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  _weak_roots.oops_do<IsAlive, KeepAlive>(is_alive, keep_alive, worker_id);
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  _dedup_roots.oops_do(is_alive, keep_alive, worker_id);
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}
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_INLINE_HPP