| /* |
| * Copyright (c) 2015, 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 "gc/g1/g1OopClosures.inline.hpp" |
| #include "gc/g1/g1RootClosures.hpp" |
| #include "gc/g1/g1SharedClosures.hpp" |
| |
| // Closures used for standard G1 evacuation. |
| class G1EvacuationClosures : public G1EvacuationRootClosures { |
| G1SharedClosures<G1MarkNone> _closures; |
| |
| public: |
| G1EvacuationClosures(G1CollectedHeap* g1h, |
| G1ParScanThreadState* pss, |
| bool gcs_are_young) : |
| _closures(g1h, pss, gcs_are_young, /* must_claim_cld */ false) {} |
| |
| OopClosure* weak_oops() { return &_closures._buffered_oops; } |
| OopClosure* strong_oops() { return &_closures._buffered_oops; } |
| |
| CLDClosure* weak_clds() { return &_closures._clds; } |
| CLDClosure* strong_clds() { return &_closures._clds; } |
| CLDClosure* second_pass_weak_clds() { return NULL; } |
| |
| CodeBlobClosure* strong_codeblobs() { return &_closures._codeblobs; } |
| CodeBlobClosure* weak_codeblobs() { return &_closures._codeblobs; } |
| |
| void flush() { _closures._buffered_oops.done(); } |
| double closure_app_seconds() { return _closures._buffered_oops.closure_app_seconds(); } |
| |
| OopClosure* raw_strong_oops() { return &_closures._oops; } |
| |
| bool trace_metadata() { return false; } |
| }; |
| |
| // Closures used during initial mark. |
| // The treatment of "weak" roots is selectable through the template parameter, |
| // this is usually used to control unloading of classes and interned strings. |
| template <G1Mark MarkWeak> |
| class G1InitialMarkClosures : public G1EvacuationRootClosures { |
| G1SharedClosures<G1MarkFromRoot> _strong; |
| G1SharedClosures<MarkWeak> _weak; |
| |
| // Filter method to help with returning the appropriate closures |
| // depending on the class template parameter. |
| template <G1Mark Mark, typename T> |
| T* null_if(T* t) { |
| if (Mark == MarkWeak) { |
| return NULL; |
| } |
| return t; |
| } |
| |
| public: |
| G1InitialMarkClosures(G1CollectedHeap* g1h, |
| G1ParScanThreadState* pss) : |
| _strong(g1h, pss, /* process_only_dirty_klasses */ false, /* must_claim_cld */ true), |
| _weak(g1h, pss, /* process_only_dirty_klasses */ false, /* must_claim_cld */ true) {} |
| |
| OopClosure* weak_oops() { return &_weak._buffered_oops; } |
| OopClosure* strong_oops() { return &_strong._buffered_oops; } |
| |
| // If MarkWeak is G1MarkPromotedFromRoot then the weak CLDs must be processed in a second pass. |
| CLDClosure* weak_clds() { return null_if<G1MarkPromotedFromRoot>(&_weak._clds); } |
| CLDClosure* strong_clds() { return &_strong._clds; } |
| |
| // If MarkWeak is G1MarkFromRoot then all CLDs are processed by the weak and strong variants |
| // return a NULL closure for the following specialized versions in that case. |
| CLDClosure* second_pass_weak_clds() { return null_if<G1MarkFromRoot>(&_weak._clds); } |
| |
| CodeBlobClosure* strong_codeblobs() { return &_strong._codeblobs; } |
| CodeBlobClosure* weak_codeblobs() { return &_weak._codeblobs; } |
| |
| void flush() { |
| _strong._buffered_oops.done(); |
| _weak._buffered_oops.done(); |
| } |
| |
| double closure_app_seconds() { |
| return _strong._buffered_oops.closure_app_seconds() + |
| _weak._buffered_oops.closure_app_seconds(); |
| } |
| |
| OopClosure* raw_strong_oops() { return &_strong._oops; } |
| |
| // If we are not marking all weak roots then we are tracing |
| // which metadata is alive. |
| bool trace_metadata() { return MarkWeak == G1MarkPromotedFromRoot; } |
| }; |
| |
| G1EvacuationRootClosures* G1EvacuationRootClosures::create_root_closures(G1ParScanThreadState* pss, G1CollectedHeap* g1h) { |
| G1EvacuationRootClosures* res = create_root_closures_ext(pss, g1h); |
| if (res != NULL) { |
| return res; |
| } |
| |
| if (g1h->collector_state()->during_initial_mark_pause()) { |
| if (ClassUnloadingWithConcurrentMark) { |
| res = new G1InitialMarkClosures<G1MarkPromotedFromRoot>(g1h, pss); |
| } else { |
| res = new G1InitialMarkClosures<G1MarkFromRoot>(g1h, pss); |
| } |
| } else { |
| res = new G1EvacuationClosures(g1h, pss, g1h->collector_state()->gcs_are_young()); |
| } |
| return res; |
| } |