Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1OopClosures.hpp @ 14486:4f227ecd7beb
8035326: Assume non-NULL references in G1CollectedHeap::in_cset_fast_test
Summary: Remove the assumption that G1CollectedHeap::in_cset_fast_test needs to check for NULL references. Most of the time this is not required, making the code doing this check multiple times.
Reviewed-by: stefank, mgerdin, jmasa
author | tschatzl |
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date | Mon, 24 Feb 2014 09:40:49 +0100 |
parents | e9d5c28e5059 |
children | 97300b6165f8 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
342 | 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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP | |
27 | |
342 | 28 class HeapRegion; |
29 class G1CollectedHeap; | |
30 class G1RemSet; | |
31 class ConcurrentMark; | |
32 class DirtyCardToOopClosure; | |
33 class CMBitMap; | |
34 class CMMarkStack; | |
35 class G1ParScanThreadState; | |
3771 | 36 class CMTask; |
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37 class ReferenceProcessor; |
342 | 38 |
39 // A class that scans oops in a given heap region (much as OopsInGenClosure | |
40 // scans oops in a generation.) | |
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41 class OopsInHeapRegionClosure: public ExtendedOopClosure { |
342 | 42 protected: |
43 HeapRegion* _from; | |
44 public: | |
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45 void set_region(HeapRegion* from) { _from = from; } |
342 | 46 }; |
47 | |
48 class G1ParClosureSuper : public OopsInHeapRegionClosure { | |
49 protected: | |
50 G1CollectedHeap* _g1; | |
51 G1ParScanThreadState* _par_scan_state; | |
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52 uint _worker_id; |
342 | 53 public: |
54 G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); | |
55 bool apply_to_weak_ref_discovered_field() { return true; } | |
56 }; | |
57 | |
1261 | 58 class G1ParPushHeapRSClosure : public G1ParClosureSuper { |
59 public: | |
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60 G1ParPushHeapRSClosure(G1CollectedHeap* g1, |
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61 G1ParScanThreadState* par_scan_state): |
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62 G1ParClosureSuper(g1, par_scan_state) { } |
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63 |
1261 | 64 template <class T> void do_oop_nv(T* p); |
65 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
66 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
67 }; | |
68 | |
342 | 69 class G1ParScanClosure : public G1ParClosureSuper { |
70 public: | |
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71 G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : |
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72 G1ParClosureSuper(g1, par_scan_state) |
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73 { |
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74 assert(_ref_processor == NULL, "sanity"); |
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75 _ref_processor = rp; |
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76 } |
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77 |
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78 template <class T> void do_oop_nv(T* p); |
342 | 79 virtual void do_oop(oop* p) { do_oop_nv(p); } |
80 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
81 }; | |
82 | |
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83 #define G1_PARTIAL_ARRAY_MASK 0x2 |
342 | 84 |
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85 inline bool has_partial_array_mask(oop* ref) { |
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86 return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK; |
526 | 87 } |
88 | |
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89 // We never encode partial array oops as narrowOop*, so return false immediately. |
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90 // This allows the compiler to create optimized code when popping references from |
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91 // the work queue. |
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92 inline bool has_partial_array_mask(narrowOop* ref) { |
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93 assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*"); |
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94 return false; |
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95 } |
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96 |
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97 // Only implement set_partial_array_mask() for regular oops, not for narrowOops. |
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98 // We always encode partial arrays as regular oop, to allow the |
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99 // specialization for has_partial_array_mask() for narrowOops above. |
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100 // This means that unintentional use of this method with narrowOops are caught |
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101 // by the compiler. |
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102 inline oop* set_partial_array_mask(oop obj) { |
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103 assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!"); |
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104 return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK); |
526 | 105 } |
106 | |
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107 template <class T> inline oop clear_partial_array_mask(T* ref) { |
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108 return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK); |
526 | 109 } |
110 | |
342 | 111 class G1ParScanPartialArrayClosure : public G1ParClosureSuper { |
112 G1ParScanClosure _scanner; | |
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113 |
342 | 114 public: |
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115 G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, ReferenceProcessor* rp) : |
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116 G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state, rp) |
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117 { |
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118 assert(_ref_processor == NULL, "sanity"); |
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119 } |
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120 |
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121 G1ParScanClosure* scanner() { |
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122 return &_scanner; |
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123 } |
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124 |
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125 template <class T> void do_oop_nv(T* p); |
342 | 126 virtual void do_oop(oop* p) { do_oop_nv(p); } |
127 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
128 }; | |
129 | |
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130 // Add back base class for metadata |
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131 class G1ParCopyHelper : public G1ParClosureSuper { |
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132 protected: |
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133 Klass* _scanned_klass; |
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134 ConcurrentMark* _cm; |
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135 |
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136 // Mark the object if it's not already marked. This is used to mark |
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137 // objects pointed to by roots that are guaranteed not to move |
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138 // during the GC (i.e., non-CSet objects). It is MT-safe. |
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139 void mark_object(oop obj); |
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140 |
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141 // Mark the object if it's not already marked. This is used to mark |
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142 // objects pointed to by roots that have been forwarded during a |
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143 // GC. It is MT-safe. |
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144 void mark_forwarded_object(oop from_obj, oop to_obj); |
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145 public: |
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146 G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state); |
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147 |
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148 void set_scanned_klass(Klass* k) { _scanned_klass = k; } |
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149 template <class T> void do_klass_barrier(T* p, oop new_obj); |
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150 }; |
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151 |
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152 template <G1Barrier barrier, bool do_mark_object> |
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153 class G1ParCopyClosure : public G1ParCopyHelper { |
5987 | 154 G1ParScanClosure _scanner; |
155 template <class T> void do_oop_work(T* p); | |
342 | 156 |
157 protected: | |
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158 oop copy_to_survivor_space(oop obj); |
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159 |
342 | 160 public: |
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161 G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state, |
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162 ReferenceProcessor* rp) : |
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163 _scanner(g1, par_scan_state, rp), |
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164 G1ParCopyHelper(g1, par_scan_state) { |
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165 assert(_ref_processor == NULL, "sanity"); |
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166 } |
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167 |
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168 G1ParScanClosure* scanner() { return &_scanner; } |
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169 |
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170 template <class T> void do_oop_nv(T* p) { do_oop_work(p); } |
342 | 171 virtual void do_oop(oop* p) { do_oop_nv(p); } |
172 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
173 }; | |
174 | |
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175 typedef G1ParCopyClosure<G1BarrierNone, false> G1ParScanExtRootClosure; |
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176 typedef G1ParCopyClosure<G1BarrierKlass, false> G1ParScanMetadataClosure; |
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177 |
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178 |
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179 typedef G1ParCopyClosure<G1BarrierNone, true> G1ParScanAndMarkExtRootClosure; |
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180 typedef G1ParCopyClosure<G1BarrierKlass, true> G1ParScanAndMarkMetadataClosure; |
1261 | 181 |
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182 // The following closure type is defined in g1_specialized_oop_closures.hpp: |
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183 // |
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184 // typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacClosure; |
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185 |
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186 // We use a separate closure to handle references during evacuation |
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187 // failure processing. |
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188 // We could have used another instance of G1ParScanHeapEvacClosure |
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189 // (since that closure no longer assumes that the references it |
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190 // handles point into the collection set). |
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191 |
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192 typedef G1ParCopyClosure<G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure; |
342 | 193 |
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194 class FilterIntoCSClosure: public ExtendedOopClosure { |
342 | 195 G1CollectedHeap* _g1; |
196 OopClosure* _oc; | |
197 DirtyCardToOopClosure* _dcto_cl; | |
198 public: | |
199 FilterIntoCSClosure( DirtyCardToOopClosure* dcto_cl, | |
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200 G1CollectedHeap* g1, |
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201 OopClosure* oc) : |
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202 _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { } |
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203 |
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204 template <class T> void do_oop_nv(T* p); |
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205 virtual void do_oop(oop* p) { do_oop_nv(p); } |
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206 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 207 bool apply_to_weak_ref_discovered_field() { return true; } |
208 }; | |
209 | |
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210 class FilterOutOfRegionClosure: public ExtendedOopClosure { |
342 | 211 HeapWord* _r_bottom; |
212 HeapWord* _r_end; | |
213 OopClosure* _oc; | |
214 public: | |
215 FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc); | |
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216 template <class T> void do_oop_nv(T* p); |
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217 virtual void do_oop(oop* p) { do_oop_nv(p); } |
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218 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
342 | 219 bool apply_to_weak_ref_discovered_field() { return true; } |
220 }; | |
1972 | 221 |
3771 | 222 // Closure for iterating over object fields during concurrent marking |
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223 class G1CMOopClosure : public ExtendedOopClosure { |
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224 private: |
3771 | 225 G1CollectedHeap* _g1h; |
226 ConcurrentMark* _cm; | |
227 CMTask* _task; | |
228 public: | |
229 G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* task); | |
230 template <class T> void do_oop_nv(T* p); | |
231 virtual void do_oop( oop* p) { do_oop_nv(p); } | |
232 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
233 }; | |
234 | |
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235 // Closure to scan the root regions during concurrent marking |
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236 class G1RootRegionScanClosure : public ExtendedOopClosure { |
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237 private: |
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238 G1CollectedHeap* _g1h; |
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239 ConcurrentMark* _cm; |
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240 uint _worker_id; |
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241 public: |
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242 G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, |
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243 uint worker_id) : |
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244 _g1h(g1h), _cm(cm), _worker_id(worker_id) { } |
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245 template <class T> void do_oop_nv(T* p); |
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246 virtual void do_oop( oop* p) { do_oop_nv(p); } |
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247 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } |
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248 }; |
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249 |
4839 | 250 // Closure that applies the given two closures in sequence. |
251 // Used by the RSet refinement code (when updating RSets | |
252 // during an evacuation pause) to record cards containing | |
253 // pointers into the collection set. | |
254 | |
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255 class G1Mux2Closure : public ExtendedOopClosure { |
4839 | 256 OopClosure* _c1; |
257 OopClosure* _c2; | |
258 public: | |
259 G1Mux2Closure(OopClosure *c1, OopClosure *c2); | |
260 template <class T> void do_oop_nv(T* p); | |
261 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
262 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
263 }; | |
264 | |
265 // A closure that returns true if it is actually applied | |
266 // to a reference | |
267 | |
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268 class G1TriggerClosure : public ExtendedOopClosure { |
4839 | 269 bool _triggered; |
270 public: | |
271 G1TriggerClosure(); | |
272 bool triggered() const { return _triggered; } | |
273 template <class T> void do_oop_nv(T* p); | |
274 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
275 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
276 }; | |
277 | |
278 // A closure which uses a triggering closure to determine | |
279 // whether to apply an oop closure. | |
280 | |
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281 class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure { |
4839 | 282 G1TriggerClosure* _trigger_cl; |
283 OopClosure* _oop_cl; | |
284 public: | |
285 G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc); | |
286 template <class T> void do_oop_nv(T* p); | |
287 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
288 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
289 }; | |
290 | |
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291 class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure { |
4839 | 292 G1CollectedHeap* _g1; |
293 G1RemSet* _g1_rem_set; | |
294 HeapRegion* _from; | |
295 OopsInHeapRegionClosure* _push_ref_cl; | |
296 bool _record_refs_into_cset; | |
297 int _worker_i; | |
298 | |
299 public: | |
300 G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h, | |
301 G1RemSet* rs, | |
302 OopsInHeapRegionClosure* push_ref_cl, | |
303 bool record_refs_into_cset, | |
304 int worker_i = 0); | |
305 | |
306 void set_from(HeapRegion* from) { | |
307 assert(from != NULL, "from region must be non-NULL"); | |
308 _from = from; | |
309 } | |
310 | |
311 bool self_forwarded(oop obj) { | |
312 bool result = (obj->is_forwarded() && (obj->forwardee()== obj)); | |
313 return result; | |
314 } | |
315 | |
316 bool apply_to_weak_ref_discovered_field() { return true; } | |
317 | |
318 template <class T> void do_oop_nv(T* p); | |
319 virtual void do_oop(narrowOop* p) { do_oop_nv(p); } | |
320 virtual void do_oop(oop* p) { do_oop_nv(p); } | |
321 }; | |
322 | |
1972 | 323 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP |