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annotate src/share/vm/gc_implementation/parallelScavenge/psScavenge.hpp @ 21598:05ecef0a6a24
LinearScanLifetimeAnalysisPhase: special case StackStoreOp.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 28 May 2015 13:07:25 +0200 |
parents | f2110083203d |
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0 | 1 /* |
10405 | 2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_HPP | |
27 | |
28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" | |
29 #include "gc_implementation/parallelScavenge/psVirtualspace.hpp" | |
30 #include "gc_implementation/shared/collectorCounters.hpp" | |
10405 | 31 #include "gc_implementation/shared/gcTrace.hpp" |
1972 | 32 #include "memory/allocation.hpp" |
33 #include "oops/oop.hpp" | |
34 #include "utilities/stack.hpp" | |
35 | |
0 | 36 class GCTaskManager; |
37 class GCTaskQueue; | |
38 class OopStack; | |
39 class ReferenceProcessor; | |
40 class ParallelScavengeHeap; | |
10405 | 41 class ParallelScavengeTracer; |
0 | 42 class PSIsAliveClosure; |
43 class PSRefProcTaskExecutor; | |
10405 | 44 class STWGCTimer; |
0 | 45 |
46 class PSScavenge: AllStatic { | |
47 friend class PSIsAliveClosure; | |
48 friend class PSKeepAliveClosure; | |
49 friend class PSPromotionManager; | |
50 | |
51 enum ScavengeSkippedCause { | |
52 not_skipped = 0, | |
53 to_space_not_empty, | |
54 promoted_too_large, | |
55 full_follows_scavenge | |
56 }; | |
57 | |
58 // Saved value of to_space->top(), used to prevent objects in to_space from | |
59 // being rescanned. | |
60 static HeapWord* _to_space_top_before_gc; | |
61 | |
62 // Number of consecutive attempts to scavenge that were skipped | |
63 static int _consecutive_skipped_scavenges; | |
64 | |
65 | |
66 protected: | |
67 // Flags/counters | |
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68 static ReferenceProcessor* _ref_processor; // Reference processor for scavenging. |
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69 static PSIsAliveClosure _is_alive_closure; // Closure used for reference processing |
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70 static CardTableExtension* _card_table; // We cache the card table for fast access. |
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71 static bool _survivor_overflow; // Overflow this collection |
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72 static uint _tenuring_threshold; // tenuring threshold for next scavenge |
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73 static elapsedTimer _accumulated_time; // total time spent on scavenge |
10405 | 74 static STWGCTimer _gc_timer; // GC time book keeper |
75 static ParallelScavengeTracer _gc_tracer; // GC tracing | |
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76 // The lowest address possible for the young_gen. |
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77 // This is used to decide if an oop should be scavenged, |
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78 // cards should be marked, etc. |
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79 static HeapWord* _young_generation_boundary; |
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80 // Used to optimize compressed oops young gen boundary checking. |
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81 static uintptr_t _young_generation_boundary_compressed; |
6197 | 82 static Stack<markOop, mtGC> _preserved_mark_stack; // List of marks to be restored after failed promotion |
83 static Stack<oop, mtGC> _preserved_oop_stack; // List of oops that need their mark restored. | |
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84 static CollectorCounters* _counters; // collector performance counters |
0 | 85 |
86 static void clean_up_failed_promotion(); | |
87 | |
88 static bool should_attempt_scavenge(); | |
89 | |
90 static HeapWord* to_space_top_before_gc() { return _to_space_top_before_gc; } | |
91 static inline void save_to_space_top_before_gc(); | |
92 | |
93 // Private accessors | |
94 static CardTableExtension* const card_table() { assert(_card_table != NULL, "Sanity"); return _card_table; } | |
95 | |
96 public: | |
97 // Accessors | |
6818 | 98 static uint tenuring_threshold() { return _tenuring_threshold; } |
0 | 99 static elapsedTimer* accumulated_time() { return &_accumulated_time; } |
100 static int consecutive_skipped_scavenges() | |
101 { return _consecutive_skipped_scavenges; } | |
102 | |
103 // Performance Counters | |
104 static CollectorCounters* counters() { return _counters; } | |
105 | |
106 // Used by scavenge_contents && psMarkSweep | |
107 static ReferenceProcessor* const reference_processor() { | |
108 assert(_ref_processor != NULL, "Sanity"); | |
109 return _ref_processor; | |
110 } | |
111 // Used to add tasks | |
112 static GCTaskManager* const gc_task_manager(); | |
113 // The promotion managers tell us if they encountered overflow | |
114 static void set_survivor_overflow(bool state) { | |
115 _survivor_overflow = state; | |
116 } | |
117 // Adaptive size policy support. When the young generation/old generation | |
118 // boundary moves, _young_generation_boundary must be reset | |
119 static void set_young_generation_boundary(HeapWord* v) { | |
120 _young_generation_boundary = v; | |
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121 if (UseCompressedOops) { |
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122 _young_generation_boundary_compressed = (uintptr_t)oopDesc::encode_heap_oop((oop)v); |
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123 } |
0 | 124 } |
125 | |
126 // Called by parallelScavengeHeap to init the tenuring threshold | |
127 static void initialize(); | |
128 | |
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129 // Scavenge entry point. This may invoke a full gc; return true if so. |
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130 static bool invoke(); |
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131 // Return true if a collection was done; false otherwise. |
0 | 132 static bool invoke_no_policy(); |
133 | |
134 // If an attempt to promote fails, this method is invoked | |
135 static void oop_promotion_failed(oop obj, markOop obj_mark); | |
136 | |
113
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137 template <class T> static inline bool should_scavenge(T* p); |
0 | 138 |
139 // These call should_scavenge() above and, if it returns true, also check that | |
140 // the object was not newly copied into to_space. The version with the bool | |
141 // argument is a convenience wrapper that fetches the to_space pointer from | |
142 // the heap and calls the other version (if the arg is true). | |
113
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143 template <class T> static inline bool should_scavenge(T* p, MutableSpace* to_space); |
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144 template <class T> static inline bool should_scavenge(T* p, bool check_to_space); |
0 | 145 |
4909 | 146 template <class T, bool promote_immediately> |
147 inline static void copy_and_push_safe_barrier(PSPromotionManager* pm, T* p); | |
0 | 148 |
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149 static void copy_and_push_safe_barrier_from_klass(PSPromotionManager* pm, oop* p); |
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150 |
0 | 151 // Is an object in the young generation |
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152 // This assumes that the 'o' is in the heap, |
0 | 153 // so it only checks one side of the complete predicate. |
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154 |
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155 inline static bool is_obj_in_young(oop o) { |
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156 return (HeapWord*)o >= _young_generation_boundary; |
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157 } |
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158 |
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159 inline static bool is_obj_in_young(narrowOop o) { |
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160 return (uintptr_t)o >= _young_generation_boundary_compressed; |
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161 } |
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162 |
0 | 163 inline static bool is_obj_in_young(HeapWord* o) { |
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164 return o >= _young_generation_boundary; |
0 | 165 } |
166 }; | |
1972 | 167 |
168 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_HPP |