| /* |
| * Copyright (c) 2001, 2015, 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_VM_GC_SERIAL_TENUREDGENERATION_HPP |
| #define SHARE_VM_GC_SERIAL_TENUREDGENERATION_HPP |
| |
| #include "gc/serial/cSpaceCounters.hpp" |
| #include "gc/shared/cardGeneration.hpp" |
| #include "gc/shared/gcStats.hpp" |
| #include "gc/shared/generationCounters.hpp" |
| #include "utilities/macros.hpp" |
| |
| // TenuredGeneration models the heap containing old (promoted/tenured) objects |
| // contained in a single contiguous space. |
| // |
| // Garbage collection is performed using mark-compact. |
| |
| class TenuredGeneration: public CardGeneration { |
| friend class VMStructs; |
| // Abstractly, this is a subtype that gets access to protected fields. |
| friend class VM_PopulateDumpSharedSpace; |
| |
| protected: |
| ContiguousSpace* _the_space; // Actual space holding objects |
| |
| GenerationCounters* _gen_counters; |
| CSpaceCounters* _space_counters; |
| |
| // Allocation failure |
| virtual bool expand(size_t bytes, size_t expand_bytes); |
| |
| // Accessing spaces |
| ContiguousSpace* space() const { return _the_space; } |
| |
| void assert_correct_size_change_locking(); |
| |
| public: |
| TenuredGeneration(ReservedSpace rs, |
| size_t initial_byte_size, |
| CardTableRS* remset); |
| |
| Generation::Name kind() { return Generation::MarkSweepCompact; } |
| |
| // Printing |
| const char* name() const { return "tenured generation"; } |
| const char* short_name() const { return "Tenured"; } |
| |
| size_t unsafe_max_alloc_nogc() const; |
| size_t contiguous_available() const; |
| |
| // Iteration |
| void object_iterate(ObjectClosure* blk); |
| |
| virtual inline HeapWord* allocate(size_t word_size, bool is_tlab); |
| virtual inline HeapWord* par_allocate(size_t word_size, bool is_tlab); |
| |
| template <typename OopClosureType> |
| void oop_since_save_marks_iterate(OopClosureType* cl); |
| |
| void save_marks(); |
| void reset_saved_marks(); |
| bool no_allocs_since_save_marks(); |
| |
| inline size_t block_size(const HeapWord* addr) const; |
| |
| inline bool block_is_obj(const HeapWord* addr) const; |
| |
| virtual void collect(bool full, |
| bool clear_all_soft_refs, |
| size_t size, |
| bool is_tlab); |
| |
| HeapWord* expand_and_allocate(size_t size, |
| bool is_tlab, |
| bool parallel = false); |
| |
| virtual void prepare_for_verify(); |
| |
| virtual void gc_prologue(bool full); |
| virtual void gc_epilogue(bool full); |
| |
| bool should_collect(bool full, |
| size_t word_size, |
| bool is_tlab); |
| |
| virtual void compute_new_size(); |
| |
| // Performance Counter support |
| void update_counters(); |
| |
| virtual void record_spaces_top(); |
| |
| // Statistics |
| |
| virtual void update_gc_stats(Generation* current_generation, bool full); |
| |
| virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const; |
| |
| virtual void verify(); |
| virtual void print_on(outputStream* st) const; |
| }; |
| |
| #endif // SHARE_VM_GC_SERIAL_TENUREDGENERATION_HPP |