Mercurial > hg > graal-compiler
annotate src/share/vm/memory/genOopClosures.hpp @ 367:194b8e3a2fc4
6384206: Phis which are later unneeded are impairing our ability to inline based on static types
Reviewed-by: rasbold, jrose
author | never |
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date | Wed, 17 Sep 2008 12:59:52 -0700 |
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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 |
59 public: | |
60 OopsInGenClosure() : OopClosure(NULL), | |
61 _orig_gen(NULL), _gen(NULL), _gen_boundary(NULL), _rs(NULL) {}; | |
62 | |
63 OopsInGenClosure(Generation* gen); | |
64 void set_generation(Generation* gen); | |
65 | |
66 void reset_generation() { _gen = _orig_gen; } | |
67 | |
68 // Problem with static closures: must have _gen_boundary set at some point, | |
69 // but cannot do this until after the heap is initialized. | |
70 void set_orig_generation(Generation* gen) { | |
71 _orig_gen = gen; | |
72 set_generation(gen); | |
73 } | |
74 | |
75 HeapWord* gen_boundary() { return _gen_boundary; } | |
76 }; | |
77 | |
78 // Closure for scanning DefNewGeneration. | |
79 // | |
80 // This closure will perform barrier store calls for ALL | |
81 // pointers in scanned oops. | |
82 class ScanClosure: public OopsInGenClosure { | |
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83 protected: |
0 | 84 DefNewGeneration* _g; |
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85 HeapWord* _boundary; |
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86 bool _gc_barrier; |
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87 template <class T> inline void do_oop_work(T* p); |
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88 public: |
0 | 89 ScanClosure(DefNewGeneration* g, bool gc_barrier); |
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90 virtual void do_oop(oop* p); |
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91 virtual void do_oop(narrowOop* p); |
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92 inline void do_oop_nv(oop* p); |
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93 inline void do_oop_nv(narrowOop* p); |
0 | 94 bool do_header() { return false; } |
95 Prefetch::style prefetch_style() { | |
96 return Prefetch::do_write; | |
97 } | |
98 }; | |
99 | |
100 // Closure for scanning DefNewGeneration. | |
101 // | |
102 // This closure only performs barrier store calls on | |
103 // pointers into the DefNewGeneration. This is less | |
104 // precise, but faster, than a ScanClosure | |
105 class FastScanClosure: public OopsInGenClosure { | |
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106 protected: |
0 | 107 DefNewGeneration* _g; |
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108 HeapWord* _boundary; |
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109 bool _gc_barrier; |
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110 template <class T> inline void do_oop_work(T* p); |
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111 public: |
0 | 112 FastScanClosure(DefNewGeneration* g, bool gc_barrier); |
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113 virtual void do_oop(oop* p); |
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114 virtual void do_oop(narrowOop* p); |
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115 inline void do_oop_nv(oop* p); |
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116 inline void do_oop_nv(narrowOop* p); |
0 | 117 bool do_header() { return false; } |
118 Prefetch::style prefetch_style() { | |
119 return Prefetch::do_write; | |
120 } | |
121 }; | |
122 | |
123 class FilteringClosure: public OopClosure { | |
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124 private: |
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125 HeapWord* _boundary; |
0 | 126 OopClosure* _cl; |
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127 protected: |
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128 template <class T> inline void do_oop_work(T* p) { |
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129 T heap_oop = oopDesc::load_heap_oop(p); |
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130 if (!oopDesc::is_null(heap_oop)) { |
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131 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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132 if ((HeapWord*)obj < _boundary) { |
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133 _cl->do_oop(p); |
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134 } |
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135 } |
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136 } |
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137 public: |
0 | 138 FilteringClosure(HeapWord* boundary, OopClosure* cl) : |
139 OopClosure(cl->_ref_processor), _boundary(boundary), | |
140 _cl(cl) {} | |
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141 virtual void do_oop(oop* p); |
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142 virtual void do_oop(narrowOop* p); |
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143 inline void do_oop_nv(oop* p) { FilteringClosure::do_oop_work(p); } |
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144 inline void do_oop_nv(narrowOop* p) { FilteringClosure::do_oop_work(p); } |
0 | 145 bool do_header() { return false; } |
146 }; | |
147 | |
148 // Closure for scanning DefNewGeneration's weak references. | |
149 // NOTE: very much like ScanClosure but not derived from | |
150 // OopsInGenClosure -- weak references are processed all | |
151 // at once, with no notion of which generation they were in. | |
152 class ScanWeakRefClosure: public OopClosure { | |
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153 protected: |
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154 DefNewGeneration* _g; |
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155 HeapWord* _boundary; |
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156 template <class T> inline void do_oop_work(T* p); |
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157 public: |
0 | 158 ScanWeakRefClosure(DefNewGeneration* g); |
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159 virtual void do_oop(oop* p); |
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160 virtual void do_oop(narrowOop* p); |
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161 inline void do_oop_nv(oop* p); |
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162 inline void do_oop_nv(narrowOop* p); |
0 | 163 }; |
164 | |
165 class VerifyOopClosure: public OopClosure { | |
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166 protected: |
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167 template <class T> inline void do_oop_work(T* p) { |
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168 oop obj = oopDesc::load_decode_heap_oop(p); |
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169 guarantee(obj->is_oop_or_null(), "invalid oop"); |
0 | 170 } |
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171 public: |
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172 virtual void do_oop(oop* p); |
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173 virtual void do_oop(narrowOop* p); |
0 | 174 static VerifyOopClosure verify_oop; |
175 }; |