annotate src/hotspot/share/gc/epsilon/epsilonHeap.hpp @ 56350:56014b46de69

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author shade
date Mon, 26 Mar 2018 16:01:23 +0200
parents 6f96c46be4e6
children ebb84e128ed3
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shade@55767 1 /*
shade@56350 2 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
shade@55767 3 *
shade@55767 4 * This code is free software; you can redistribute it and/or modify it
shade@55767 5 * under the terms of the GNU General Public License version 2 only, as
shade@55767 6 * published by the Free Software Foundation.
shade@55767 7 *
shade@55767 8 * This code is distributed in the hope that it will be useful, but WITHOUT
shade@55767 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
shade@55767 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
shade@55767 11 * version 2 for more details (a copy is included in the LICENSE file that
shade@55767 12 * accompanied this code).
shade@55767 13 *
shade@55767 14 * You should have received a copy of the GNU General Public License version
shade@55767 15 * 2 along with this work; if not, write to the Free Software Foundation,
shade@55767 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
shade@55767 17 *
shade@55767 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
shade@55767 19 * or visit www.oracle.com if you need additional information or have any
shade@55767 20 * questions.
shade@55767 21 *
shade@55767 22 */
shade@55767 23
shade@55767 24 #ifndef SHARE_VM_GC_EPSILON_COLLECTEDHEAP_HPP
shade@55767 25 #define SHARE_VM_GC_EPSILON_COLLECTEDHEAP_HPP
shade@55767 26
shade@55767 27 #include "gc/shared/collectedHeap.hpp"
shade@55767 28 #include "gc/shared/space.hpp"
shade@55975 29 #include "services/memoryManager.hpp"
shade@55767 30 #include "gc/epsilon/epsilonCollectorPolicy.hpp"
shade@55767 31 #include "gc/epsilon/epsilonMonitoringSupport.hpp"
shade@55767 32 #include "gc/epsilon/epsilonBarrierSet.hpp"
shade@55767 33 #include "gc/epsilon/epsilon_globals.hpp"
shade@55767 34
shade@55939 35 class EpsilonHeap : public CollectedHeap {
shade@55767 36 private:
shade@55767 37 EpsilonCollectorPolicy* _policy;
shade@56276 38 SoftRefPolicy _soft_ref_policy;
shade@55767 39 EpsilonMonitoringSupport* _monitoring_support;
shade@55975 40 MemoryPool* _pool;
shade@55975 41 GCMemoryManager _memory_manager;
shade@55767 42 ContiguousSpace* _space;
shade@55767 43 VirtualSpace _virtual_space;
shade@55767 44 size_t _max_tlab_size;
shade@55767 45 size_t _last_counter_update;
shade@55979 46 size_t _last_heap_print;
shade@55979 47 size_t _step_counter_update;
shade@55979 48 size_t _step_heap_print;
shade@55767 49 public:
shade@55975 50 EpsilonHeap(EpsilonCollectorPolicy* p) :
shade@55975 51 _policy(p),
shade@55975 52 _memory_manager("Epsilon Heap", "") {};
shade@55767 53
shade@55767 54 virtual Name kind() const {
shade@55939 55 return CollectedHeap::EpsilonHeap;
shade@55767 56 }
shade@55767 57
shade@55767 58 virtual const char *name() const {
shade@55767 59 return "Epsilon GC";
shade@55767 60 }
shade@55767 61
shade@55767 62 virtual jint initialize();
shade@55767 63
shade@55974 64 virtual void post_initialize();
shade@55974 65
shade@55974 66 virtual void initialize_serviceability();
shade@55974 67 virtual GrowableArray<GCMemoryManager*> memory_managers();
shade@55974 68 virtual GrowableArray<MemoryPool*> memory_pools();
shade@55767 69
shade@55939 70 static EpsilonHeap* heap();
shade@55767 71
shade@55767 72 virtual size_t capacity() const { return _virtual_space.committed_size(); }
shade@55767 73 virtual size_t used() const { return _space->used(); }
shade@55767 74 virtual size_t max_capacity() const { return _virtual_space.reserved_size(); }
shade@55767 75
shade@55767 76 virtual bool is_maximal_no_gc() const {
shade@55767 77 // No GC is going to happen, unless we are at capacity.
shade@55767 78 // At which point we will fail anyway.
shade@55767 79 return used() == capacity();
shade@55767 80 }
shade@55767 81
shade@55767 82 virtual bool is_in(const void *p) const { return _space->is_in(p); }
shade@55767 83
shade@55767 84 virtual bool is_scavengable(oop obj) {
shade@55767 85 // Epsilon does not move objects, no objects are scavengable.
shade@55767 86 return false;
shade@55767 87 }
shade@55767 88
shade@55767 89 HeapWord* allocate_work(size_t size);
shade@55767 90 virtual HeapWord* mem_allocate(size_t size, bool *gc_overhead_limit_was_exceeded);
shade@55767 91 virtual HeapWord* allocate_new_tlab(size_t size);
shade@55767 92
shade@55767 93 // TLAB allocations
shade@55767 94 virtual bool supports_tlab_allocation() const { return UseTLAB; }
shade@55767 95 virtual size_t tlab_capacity(Thread *thr) const { return capacity(); }
shade@55767 96 virtual size_t tlab_used(Thread *thr) const { return used(); }
shade@55767 97 virtual size_t max_tlab_size() const { return _max_tlab_size; }
shade@55767 98 virtual size_t unsafe_max_tlab_alloc(Thread *thr) const;
shade@55767 99
shade@55767 100 virtual void collect(GCCause::Cause cause);
shade@55767 101 virtual void do_full_collection(bool clear_all_soft_refs);
shade@55767 102
shade@55767 103 virtual AdaptiveSizePolicy *size_policy() {
shade@55767 104 // No such thing for Epsilon
shade@55767 105 return NULL;
shade@55767 106 }
shade@55767 107
shade@55767 108 virtual CollectorPolicy *collector_policy() const {
shade@55767 109 return _policy;
shade@55767 110 }
shade@55767 111
shade@56276 112 virtual SoftRefPolicy* soft_ref_policy() {
shade@56276 113 return &_soft_ref_policy;
shade@56276 114 }
shade@56276 115
shade@55767 116 virtual void object_iterate(ObjectClosure *cl) {
shade@55767 117 safe_object_iterate(cl);
shade@55767 118 }
shade@55767 119
shade@55767 120 virtual void safe_object_iterate(ObjectClosure *cl);
shade@55767 121
shade@55767 122 virtual HeapWord* block_start(const void *addr) const {
shade@55767 123 // Epsilon does not support block parsing.
shade@55767 124 return NULL;
shade@55767 125 }
shade@55767 126
shade@55767 127 virtual size_t block_size(const HeapWord *addr) const {
shade@55767 128 // Epsilon does not support block parsing.
shade@55767 129 return 0;
shade@55767 130 }
shade@55767 131
shade@55767 132 virtual bool block_is_obj(const HeapWord *addr) const {
shade@55767 133 // Epsilon does not support block parsing.
shade@55767 134 return false;
shade@55767 135 }
shade@55767 136
shade@55767 137 virtual jlong millis_since_last_gc() {
shade@55767 138 // Report time since the VM start
shade@55767 139 return os::elapsed_counter() / NANOSECS_PER_MILLISEC;
shade@55767 140 }
shade@55767 141
shade@55767 142 virtual void prepare_for_verify() {
shade@55767 143 // No heap verification.
shade@55767 144 }
shade@55767 145
shade@55767 146 virtual void print_gc_threads_on(outputStream *st) const {
shade@55767 147 // No GC threads.
shade@55767 148 }
shade@55767 149
shade@55767 150 virtual void gc_threads_do(ThreadClosure *tc) const {
shade@55767 151 // No GC threads.
shade@55767 152 }
shade@55767 153
shade@55767 154 virtual void print_on(outputStream *st) const;
shade@55767 155 virtual void print_tracing_info() const;
shade@55767 156
shade@55767 157 virtual void verify(VerifyOption option) {
shade@55767 158 // No heap verification for Epsilon.
shade@55767 159 }
shade@55767 160
shade@55767 161 };
shade@55767 162
shade@55767 163 #endif // SHARE_VM_GC_EPSILON_COLLECTEDHEAP_HPP