hotspot/src/share/vm/gc/g1/g1RootClosures.cpp
author jprovino
Sat, 27 Feb 2016 00:07:03 +0000
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child 38074 8475fdc6dcc3
permissions -rw-r--r--
Merge
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/*
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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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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#include "precompiled.hpp"
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#include "gc/g1/g1OopClosures.inline.hpp"
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#include "gc/g1/g1RootClosures.hpp"
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#include "gc/g1/g1SharedClosures.hpp"
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// Closures used for standard G1 evacuation.
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class G1EvacuationClosures : public G1EvacuationRootClosures {
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  G1SharedClosures<G1MarkNone> _closures;
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public:
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  G1EvacuationClosures(G1CollectedHeap* g1h,
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                       G1ParScanThreadState* pss,
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                       bool gcs_are_young) :
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      _closures(g1h, pss, gcs_are_young, /* must_claim_cld */ false) {}
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  OopClosure* weak_oops()   { return &_closures._buffered_oops; }
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  OopClosure* strong_oops() { return &_closures._buffered_oops; }
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  CLDClosure* weak_clds()             { return &_closures._clds; }
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  CLDClosure* strong_clds()           { return &_closures._clds; }
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  CLDClosure* thread_root_clds()      { return NULL; }
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  CLDClosure* second_pass_weak_clds() { return NULL; }
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  CodeBlobClosure* strong_codeblobs()      { return &_closures._codeblobs; }
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  CodeBlobClosure* weak_codeblobs()        { return &_closures._codeblobs; }
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  void flush()                 { _closures._buffered_oops.done(); }
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  double closure_app_seconds() { return _closures._buffered_oops.closure_app_seconds(); }
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  OopClosure* raw_strong_oops() { return &_closures._oops; }
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  bool trace_metadata()         { return false; }
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};
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// Closures used during initial mark.
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// The treatment of "weak" roots is selectable through the template parameter,
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// this is usually used to control unloading of classes and interned strings.
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template <G1Mark MarkWeak>
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class G1InitalMarkClosures : public G1EvacuationRootClosures {
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  G1SharedClosures<G1MarkFromRoot> _strong;
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  G1SharedClosures<MarkWeak>       _weak;
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  // Filter method to help with returning the appropriate closures
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  // depending on the class template parameter.
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  template <G1Mark Mark, typename T>
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  T* null_if(T* t) {
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    if (Mark == MarkWeak) {
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      return NULL;
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    }
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    return t;
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  }
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public:
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  G1InitalMarkClosures(G1CollectedHeap* g1h,
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                       G1ParScanThreadState* pss) :
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      _strong(g1h, pss, /* process_only_dirty_klasses */ false, /* must_claim_cld */ true),
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      _weak(g1h, pss,   /* process_only_dirty_klasses */ false, /* must_claim_cld */ true) {}
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  OopClosure* weak_oops()   { return &_weak._buffered_oops; }
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  OopClosure* strong_oops() { return &_strong._buffered_oops; }
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  // If MarkWeak is G1MarkPromotedFromRoot then the weak CLDs must be processed in a second pass.
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  CLDClosure* weak_clds()             { return null_if<G1MarkPromotedFromRoot>(&_weak._clds); }
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  CLDClosure* strong_clds()           { return &_strong._clds; }
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  // If MarkWeak is G1MarkFromRoot then all CLDs are processed by the weak and strong variants
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  // return a NULL closure for the following specialized versions in that case.
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  CLDClosure* thread_root_clds()      { return null_if<G1MarkFromRoot>(&_strong._clds); }
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  CLDClosure* second_pass_weak_clds() { return null_if<G1MarkFromRoot>(&_weak._clds); }
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  CodeBlobClosure* strong_codeblobs()      { return &_strong._codeblobs; }
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  CodeBlobClosure* weak_codeblobs()        { return &_weak._codeblobs; }
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  void flush() {
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    _strong._buffered_oops.done();
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    _weak._buffered_oops.done();
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  }
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  double closure_app_seconds() {
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    return _strong._buffered_oops.closure_app_seconds() +
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           _weak._buffered_oops.closure_app_seconds();
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  }
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  OopClosure* raw_strong_oops() { return &_strong._oops; }
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  // If we are not marking all weak roots then we are tracing
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  // which metadata is alive.
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  bool trace_metadata()         { return MarkWeak == G1MarkPromotedFromRoot; }
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};
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G1EvacuationRootClosures* G1EvacuationRootClosures::create_root_closures(G1ParScanThreadState* pss, G1CollectedHeap* g1h) {
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  G1EvacuationRootClosures* res = create_root_closures_ext(pss, g1h);
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  if (res != NULL) {
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    return res;
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  }
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  if (g1h->collector_state()->during_initial_mark_pause()) {
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    if (ClassUnloadingWithConcurrentMark) {
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      res = new G1InitalMarkClosures<G1MarkPromotedFromRoot>(g1h, pss);
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    } else {
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      res = new G1InitalMarkClosures<G1MarkFromRoot>(g1h, pss);
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    }
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  } else {
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    res = new G1EvacuationClosures(g1h, pss, g1h->collector_state()->gcs_are_young());
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  }
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  return res;
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}