Mercurial > hg > truffle
annotate src/share/vm/memory/genOopClosures.hpp @ 14308:870aedf4ba4f
8032379: Remove the is_scavenging flag to process_strong_roots
Summary: Refactor the strong root processing to avoid using a boolean in addition to the ScanOption enum.
Reviewed-by: stefank, tschatzl, ehelin, jmasa
author | mgerdin |
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date | Tue, 14 Jan 2014 16:40:33 +0100 |
parents | da91efe96a93 |
children | 78bbf4d43a14 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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_MEMORY_GENOOPCLOSURES_HPP |
26 #define SHARE_VM_MEMORY_GENOOPCLOSURES_HPP | |
27 | |
28 #include "memory/iterator.hpp" | |
29 #include "oops/oop.hpp" | |
30 | |
0 | 31 class Generation; |
32 class HeapWord; | |
33 class CardTableRS; | |
34 class CardTableModRefBS; | |
35 class DefNewGeneration; | |
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36 class KlassRemSet; |
0 | 37 |
6197 | 38 template<class E, MEMFLAGS F, unsigned int N> class GenericTaskQueue; |
39 typedef GenericTaskQueue<oop, mtGC, TASKQUEUE_SIZE> OopTaskQueue; | |
40 template<class T, MEMFLAGS F> class GenericTaskQueueSet; | |
41 typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet; | |
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42 |
0 | 43 // Closure for iterating roots from a particular generation |
44 // Note: all classes deriving from this MUST call this do_barrier | |
45 // method at the end of their own do_oop method! | |
46 // Note: no do_oop defined, this is an abstract class. | |
47 | |
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48 class OopsInGenClosure : public ExtendedOopClosure { |
0 | 49 private: |
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50 Generation* _orig_gen; // generation originally set in ctor |
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51 Generation* _gen; // generation being scanned |
0 | 52 |
53 protected: | |
54 // Some subtypes need access. | |
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55 HeapWord* _gen_boundary; // start of generation |
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56 CardTableRS* _rs; // remembered set |
0 | 57 |
58 // For assertions | |
59 Generation* generation() { return _gen; } | |
60 CardTableRS* rs() { return _rs; } | |
61 | |
62 // Derived classes that modify oops so that they might be old-to-young | |
63 // pointers must call the method below. | |
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64 template <class T> void do_barrier(T* p); |
0 | 65 |
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66 // Version for use by closures that may be called in parallel code. |
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67 template <class T> void par_do_barrier(T* p); |
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68 |
0 | 69 public: |
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70 OopsInGenClosure() : ExtendedOopClosure(NULL), |
0 | 71 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {}; |
72 | |
73 OopsInGenClosure(Generation* gen); | |
74 void set_generation(Generation* gen); | |
75 | |
76 void reset_generation() { _gen = _orig_gen; } | |
77 | |
78 // Problem with static closures: must have _gen_boundary set at some point, | |
79 // but cannot do this until after the heap is initialized. | |
80 void set_orig_generation(Generation* gen) { | |
81 _orig_gen = gen; | |
82 set_generation(gen); | |
83 } | |
84 | |
85 HeapWord* gen_boundary() { return _gen_boundary; } | |
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86 |
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87 }; |
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88 |
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89 // Super class for scan closures. It contains code to dirty scanned Klasses. |
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90 class OopsInKlassOrGenClosure: public OopsInGenClosure { |
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91 Klass* _scanned_klass; |
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92 public: |
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93 OopsInKlassOrGenClosure(Generation* g) : OopsInGenClosure(g), _scanned_klass(NULL) {} |
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94 void set_scanned_klass(Klass* k) { |
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95 assert(k == NULL || _scanned_klass == NULL, "Must be"); |
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96 _scanned_klass = k; |
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97 } |
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98 bool is_scanning_a_klass() { return _scanned_klass != NULL; } |
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99 void do_klass_barrier(); |
0 | 100 }; |
101 | |
102 // Closure for scanning DefNewGeneration. | |
103 // | |
104 // This closure will perform barrier store calls for ALL | |
105 // pointers in scanned oops. | |
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106 class ScanClosure: public OopsInKlassOrGenClosure { |
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107 protected: |
0 | 108 DefNewGeneration* _g; |
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109 HeapWord* _boundary; |
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110 bool _gc_barrier; |
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111 template <class T> inline void do_oop_work(T* p); |
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112 public: |
0 | 113 ScanClosure(DefNewGeneration* g, bool gc_barrier); |
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114 virtual void do_oop(oop* p); |
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115 virtual void do_oop(narrowOop* p); |
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116 inline void do_oop_nv(oop* p); |
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117 inline void do_oop_nv(narrowOop* p); |
0 | 118 Prefetch::style prefetch_style() { |
119 return Prefetch::do_write; | |
120 } | |
121 }; | |
122 | |
123 // Closure for scanning DefNewGeneration. | |
124 // | |
125 // This closure only performs barrier store calls on | |
126 // pointers into the DefNewGeneration. This is less | |
127 // precise, but faster, than a ScanClosure | |
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128 class FastScanClosure: public OopsInKlassOrGenClosure { |
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129 protected: |
0 | 130 DefNewGeneration* _g; |
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131 HeapWord* _boundary; |
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132 bool _gc_barrier; |
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133 template <class T> inline void do_oop_work(T* p); |
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134 public: |
0 | 135 FastScanClosure(DefNewGeneration* g, bool gc_barrier); |
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136 virtual void do_oop(oop* p); |
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137 virtual void do_oop(narrowOop* p); |
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138 inline void do_oop_nv(oop* p); |
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139 inline void do_oop_nv(narrowOop* p); |
0 | 140 Prefetch::style prefetch_style() { |
141 return Prefetch::do_write; | |
142 } | |
143 }; | |
144 | |
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145 class KlassScanClosure: public KlassClosure { |
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146 OopsInKlassOrGenClosure* _scavenge_closure; |
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147 // true if the the modified oops state should be saved. |
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148 bool _accumulate_modified_oops; |
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149 public: |
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150 KlassScanClosure(OopsInKlassOrGenClosure* scavenge_closure, |
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151 KlassRemSet* klass_rem_set_policy); |
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152 void do_klass(Klass* k); |
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153 }; |
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154 |
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155 class FilteringClosure: public ExtendedOopClosure { |
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156 private: |
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157 HeapWord* _boundary; |
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158 ExtendedOopClosure* _cl; |
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159 protected: |
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160 template <class T> inline void do_oop_work(T* p) { |
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161 T heap_oop = oopDesc::load_heap_oop(p); |
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162 if (!oopDesc::is_null(heap_oop)) { |
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163 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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164 if ((HeapWord*)obj < _boundary) { |
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165 _cl->do_oop(p); |
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166 } |
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167 } |
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168 } |
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169 public: |
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170 FilteringClosure(HeapWord* boundary, ExtendedOopClosure* cl) : |
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171 ExtendedOopClosure(cl->_ref_processor), _boundary(boundary), |
0 | 172 _cl(cl) {} |
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173 virtual void do_oop(oop* p); |
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174 virtual void do_oop(narrowOop* p); |
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175 inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); } |
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176 inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
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177 virtual bool do_metadata() { return do_metadata_nv(); } |
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178 inline bool do_metadata_nv() { assert(!_cl->do_metadata(), "assumption broken, must change to 'return _cl->do_metadata()'"); return false; } |
0 | 179 }; |
180 | |
181 // Closure for scanning DefNewGeneration's weak references. | |
182 // NOTE: very much like ScanClosure but not derived from | |
183 // OopsInGenClosure -- weak references are processed all | |
184 // at once, with no notion of which generation they were in. | |
185 class ScanWeakRefClosure: public OopClosure { | |
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186 protected: |
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187 DefNewGeneration* _g; |
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188 HeapWord* _boundary; |
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189 template <class T> inline void do_oop_work(T* p); |
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190 public: |
0 | 191 ScanWeakRefClosure(DefNewGeneration* g); |
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192 virtual void do_oop(oop* p); |
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193 virtual void do_oop(narrowOop* p); |
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194 inline void do_oop_nv(oop* p); |
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195 inline void do_oop_nv(narrowOop* p); |
0 | 196 }; |
197 | |
198 class VerifyOopClosure: public OopClosure { | |
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199 protected: |
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200 template <class T> inline void do_oop_work(T* p) { |
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201 oop obj = oopDesc::load_decode_heap_oop(p); |
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202 guarantee(obj->is_oop_or_null(), err_msg("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj)); |
0 | 203 } |
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204 public: |
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205 virtual void do_oop(oop* p); |
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206 virtual void do_oop(narrowOop* p); |
0 | 207 static VerifyOopClosure verify_oop; |
208 }; | |
1972 | 209 |
210 #endif // SHARE_VM_MEMORY_GENOOPCLOSURES_HPP |