| /* |
| * Copyright (c) 2017, 2019, 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. |
| * |
| */ |
| |
| #ifndef SHARE_GC_CMS_CMSHEAP_HPP |
| #define SHARE_GC_CMS_CMSHEAP_HPP |
| |
| #include "gc/cms/concurrentMarkSweepGeneration.hpp" |
| #include "gc/cms/parNewGeneration.hpp" |
| #include "gc/shared/collectedHeap.hpp" |
| #include "gc/shared/gcCause.hpp" |
| #include "gc/shared/genCollectedHeap.hpp" |
| #include "gc/shared/oopStorageParState.hpp" |
| #include "utilities/growableArray.hpp" |
| |
| class CLDClosure; |
| class GCMemoryManager; |
| class MemoryPool; |
| class OopsInGenClosure; |
| class outputStream; |
| class StrongRootsScope; |
| class ThreadClosure; |
| class WorkGang; |
| |
| class CMSHeap : public GenCollectedHeap { |
| public: |
| CMSHeap(); |
| |
| // Returns JNI_OK on success |
| virtual jint initialize(); |
| virtual CardTableRS* create_rem_set(const MemRegion& reserved_region); |
| |
| // Convenience function to be used in situations where the heap type can be |
| // asserted to be this type. |
| static CMSHeap* heap(); |
| |
| virtual Name kind() const { |
| return CollectedHeap::CMS; |
| } |
| |
| virtual const char* name() const { |
| return "Concurrent Mark Sweep"; |
| } |
| |
| WorkGang* workers() const { return _workers; } |
| |
| virtual void print_gc_threads_on(outputStream* st) const; |
| virtual void gc_threads_do(ThreadClosure* tc) const; |
| virtual void print_on_error(outputStream* st) const; |
| |
| // Perform a full collection of the heap; intended for use in implementing |
| // "System.gc". This implies as full a collection as the CollectedHeap |
| // supports. Caller does not hold the Heap_lock on entry. |
| void collect(GCCause::Cause cause); |
| |
| void stop(); |
| void safepoint_synchronize_begin(); |
| void safepoint_synchronize_end(); |
| |
| virtual GrowableArray<GCMemoryManager*> memory_managers(); |
| virtual GrowableArray<MemoryPool*> memory_pools(); |
| |
| // If "young_gen_as_roots" is false, younger generations are |
| // not scanned as roots; in this case, the caller must be arranging to |
| // scan the younger generations itself. (For example, a generation might |
| // explicitly mark reachable objects in younger generations, to avoid |
| // excess storage retention.) |
| void cms_process_roots(StrongRootsScope* scope, |
| bool young_gen_as_roots, |
| ScanningOption so, |
| bool only_strong_roots, |
| OopsInGenClosure* root_closure, |
| CLDClosure* cld_closure); |
| |
| GCMemoryManager* old_manager() const { return _old_manager; } |
| |
| ParNewGeneration* young_gen() const { |
| assert(_young_gen->kind() == Generation::ParNew, "Wrong generation type"); |
| return static_cast<ParNewGeneration*>(_young_gen); |
| } |
| |
| ConcurrentMarkSweepGeneration* old_gen() const { |
| assert(_old_gen->kind() == Generation::ConcurrentMarkSweep, "Wrong generation kind"); |
| return static_cast<ConcurrentMarkSweepGeneration*>(_old_gen); |
| } |
| |
| // Apply "cur->do_oop" or "older->do_oop" to all the oops in objects |
| // allocated since the last call to save_marks in the young generation. |
| // The "cur" closure is applied to references in the younger generation |
| // at "level", and the "older" closure to older generations. |
| template <typename OopClosureType1, typename OopClosureType2> |
| void oop_since_save_marks_iterate(OopClosureType1* cur, |
| OopClosureType2* older); |
| |
| private: |
| WorkGang* _workers; |
| MemoryPool* _eden_pool; |
| MemoryPool* _survivor_pool; |
| MemoryPool* _old_pool; |
| |
| virtual void gc_prologue(bool full); |
| virtual void gc_epilogue(bool full); |
| |
| virtual void initialize_serviceability(); |
| |
| // Accessor for memory state verification support |
| NOT_PRODUCT( |
| virtual size_t skip_header_HeapWords() { return CMSCollector::skip_header_HeapWords(); } |
| ) |
| |
| // Returns success or failure. |
| bool create_cms_collector(); |
| |
| // In support of ExplicitGCInvokesConcurrent functionality |
| bool should_do_concurrent_full_gc(GCCause::Cause cause); |
| |
| void collect_mostly_concurrent(GCCause::Cause cause); |
| }; |
| |
| #endif // SHARE_GC_CMS_CMSHEAP_HPP |