Mercurial > hg > graal-compiler
annotate src/share/vm/memory/genOopClosures.hpp @ 845:df6caf649ff7
6700789: G1: Enable use of compressed oops with G1 heaps
Summary: Modifications to G1 so as to allow the use of compressed oops.
Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp
| author | ysr |
|---|---|
| date | Tue, 14 Jul 2009 15:40:39 -0700 |
| parents | 1ee8caae33af |
| children | 2a1472c30599 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 class Generation; | |
| 26 class HeapWord; | |
| 27 class CardTableRS; | |
| 28 class CardTableModRefBS; | |
| 29 class DefNewGeneration; | |
| 30 | |
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31 template<class E> class GenericTaskQueue; |
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32 typedef GenericTaskQueue<oop> OopTaskQueue; |
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33 template<class E> class GenericTaskQueueSet; |
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34 typedef GenericTaskQueueSet<oop> OopTaskQueueSet; |
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35 |
| 0 | 36 // Closure for iterating roots from a particular generation |
| 37 // Note: all classes deriving from this MUST call this do_barrier | |
| 38 // method at the end of their own do_oop method! | |
| 39 // Note: no do_oop defined, this is an abstract class. | |
| 40 | |
| 41 class OopsInGenClosure : public OopClosure { | |
| 42 private: | |
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43 Generation* _orig_gen; // generation originally set in ctor |
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44 Generation* _gen; // generation being scanned |
| 0 | 45 |
| 46 protected: | |
| 47 // Some subtypes need access. | |
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48 HeapWord* _gen_boundary; // start of generation |
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49 CardTableRS* _rs; // remembered set |
| 0 | 50 |
| 51 // For assertions | |
| 52 Generation* generation() { return _gen; } | |
| 53 CardTableRS* rs() { return _rs; } | |
| 54 | |
| 55 // Derived classes that modify oops so that they might be old-to-young | |
| 56 // pointers must call the method below. | |
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57 template <class T> void do_barrier(T* p); |
| 0 | 58 |
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59 // Version for use by closures that may be called in parallel code. |
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60 template <class T> void par_do_barrier(T* p); |
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61 |
| 0 | 62 public: |
| 63 OopsInGenClosure() : OopClosure(NULL), | |
| 64 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {}; | |
| 65 | |
| 66 OopsInGenClosure(Generation* gen); | |
| 67 void set_generation(Generation* gen); | |
| 68 | |
| 69 void reset_generation() { _gen = _orig_gen; } | |
| 70 | |
| 71 // Problem with static closures: must have _gen_boundary set at some point, | |
| 72 // but cannot do this until after the heap is initialized. | |
| 73 void set_orig_generation(Generation* gen) { | |
| 74 _orig_gen = gen; | |
| 75 set_generation(gen); | |
| 76 } | |
| 77 | |
| 78 HeapWord* gen_boundary() { return _gen_boundary; } | |
| 79 }; | |
| 80 | |
| 81 // Closure for scanning DefNewGeneration. | |
| 82 // | |
| 83 // This closure will perform barrier store calls for ALL | |
| 84 // pointers in scanned oops. | |
| 85 class ScanClosure: public OopsInGenClosure { | |
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86 protected: |
| 0 | 87 DefNewGeneration* _g; |
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88 HeapWord* _boundary; |
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89 bool _gc_barrier; |
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90 template <class T> inline void do_oop_work(T* p); |
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91 public: |
| 0 | 92 ScanClosure(DefNewGeneration* g, bool gc_barrier); |
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93 virtual void do_oop(oop* p); |
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94 virtual void do_oop(narrowOop* p); |
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95 inline void do_oop_nv(oop* p); |
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96 inline void do_oop_nv(narrowOop* p); |
| 0 | 97 bool do_header() { return false; } |
| 98 Prefetch::style prefetch_style() { | |
| 99 return Prefetch::do_write; | |
| 100 } | |
| 101 }; | |
| 102 | |
| 103 // Closure for scanning DefNewGeneration. | |
| 104 // | |
| 105 // This closure only performs barrier store calls on | |
| 106 // pointers into the DefNewGeneration. This is less | |
| 107 // precise, but faster, than a ScanClosure | |
| 108 class FastScanClosure: public OopsInGenClosure { | |
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109 protected: |
| 0 | 110 DefNewGeneration* _g; |
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111 HeapWord* _boundary; |
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112 bool _gc_barrier; |
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113 template <class T> inline void do_oop_work(T* p); |
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114 public: |
| 0 | 115 FastScanClosure(DefNewGeneration* g, bool gc_barrier); |
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116 virtual void do_oop(oop* p); |
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117 virtual void do_oop(narrowOop* p); |
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118 inline void do_oop_nv(oop* p); |
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119 inline void do_oop_nv(narrowOop* p); |
| 0 | 120 bool do_header() { return false; } |
| 121 Prefetch::style prefetch_style() { | |
| 122 return Prefetch::do_write; | |
| 123 } | |
| 124 }; | |
| 125 | |
| 126 class FilteringClosure: public OopClosure { | |
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127 private: |
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128 HeapWord* _boundary; |
| 0 | 129 OopClosure* _cl; |
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130 protected: |
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131 template <class T> inline void do_oop_work(T* p) { |
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132 T heap_oop = oopDesc::load_heap_oop(p); |
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133 if (!oopDesc::is_null(heap_oop)) { |
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134 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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135 if ((HeapWord*)obj < _boundary) { |
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136 _cl->do_oop(p); |
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137 } |
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138 } |
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139 } |
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140 public: |
| 0 | 141 FilteringClosure(HeapWord* boundary, OopClosure* cl) : |
| 142 OopClosure(cl->_ref_processor), _boundary(boundary), | |
| 143 _cl(cl) {} | |
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144 virtual void do_oop(oop* p); |
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145 virtual void do_oop(narrowOop* p); |
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146 inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); } |
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147 inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
| 0 | 148 bool do_header() { return false; } |
| 149 }; | |
| 150 | |
| 151 // Closure for scanning DefNewGeneration's weak references. | |
| 152 // NOTE: very much like ScanClosure but not derived from | |
| 153 // OopsInGenClosure -- weak references are processed all | |
| 154 // at once, with no notion of which generation they were in. | |
| 155 class ScanWeakRefClosure: public OopClosure { | |
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156 protected: |
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157 DefNewGeneration* _g; |
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158 HeapWord* _boundary; |
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159 template <class T> inline void do_oop_work(T* p); |
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160 public: |
| 0 | 161 ScanWeakRefClosure(DefNewGeneration* g); |
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162 virtual void do_oop(oop* p); |
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163 virtual void do_oop(narrowOop* p); |
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164 inline void do_oop_nv(oop* p); |
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165 inline void do_oop_nv(narrowOop* p); |
| 0 | 166 }; |
| 167 | |
| 168 class VerifyOopClosure: public OopClosure { | |
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169 protected: |
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170 template <class T> inline void do_oop_work(T* p) { |
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171 oop obj = oopDesc::load_decode_heap_oop(p); |
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172 guarantee(obj->is_oop_or_null(), "invalid oop"); |
| 0 | 173 } |
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174 public: |
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175 virtual void do_oop(oop* p); |
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176 virtual void do_oop(narrowOop* p); |
| 0 | 177 static VerifyOopClosure verify_oop; |
| 178 }; |