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annotate src/share/vm/memory/iterator.hpp @ 11722:ff05c78a7f64
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author | Christian Wirth <christian.wirth@oracle.com> |
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date | Thu, 19 Sep 2013 10:36:56 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 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_ITERATOR_HPP |
26 #define SHARE_VM_MEMORY_ITERATOR_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "memory/memRegion.hpp" | |
30 #include "runtime/prefetch.hpp" | |
31 #include "utilities/top.hpp" | |
32 | |
0 | 33 // The following classes are C++ `closures` for iterating over objects, roots and spaces |
34 | |
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35 class CodeBlob; |
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36 class nmethod; |
0 | 37 class ReferenceProcessor; |
941 | 38 class DataLayout; |
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39 class KlassClosure; |
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40 class ClassLoaderData; |
0 | 41 |
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42 // Closure provides abortability. |
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43 |
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44 class Closure : public StackObj { |
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45 protected: |
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46 bool _abort; |
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47 void set_abort() { _abort = true; } |
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48 public: |
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49 Closure() : _abort(false) {} |
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50 // A subtype can use this mechanism to indicate to some iterator mapping |
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51 // functions that the iteration should cease. |
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52 bool abort() { return _abort; } |
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53 void clear_abort() { _abort = false; } |
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54 }; |
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55 |
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56 // OopClosure is used for iterating through references to Java objects. |
0 | 57 |
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58 class OopClosure : public Closure { |
0 | 59 public: |
60 virtual void do_oop(oop* o) = 0; | |
61 virtual void do_oop_v(oop* o) { do_oop(o); } | |
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62 virtual void do_oop(narrowOop* o) = 0; |
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63 virtual void do_oop_v(narrowOop* o) { do_oop(o); } |
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64 }; |
935 | 65 |
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66 // ExtendedOopClosure adds extra code to be run during oop iterations. |
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67 // This is needed by the GC and is extracted to a separate type to not |
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68 // pollute the OopClosure interface. |
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69 class ExtendedOopClosure : public OopClosure { |
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70 public: |
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71 ReferenceProcessor* _ref_processor; |
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72 ExtendedOopClosure(ReferenceProcessor* rp) : _ref_processor(rp) { } |
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73 ExtendedOopClosure() : OopClosure(), _ref_processor(NULL) { } |
0 | 74 |
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75 // If the do_metadata functions return "true", |
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76 // we invoke the following when running oop_iterate(): |
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77 // |
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78 // 1) do_klass on the header klass pointer. |
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79 // 2) do_klass on the klass pointer in the mirrors. |
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80 // 3) do_class_loader_data on the class loader data in class loaders. |
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81 // |
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82 // The virtual (without suffix) and the non-virtual (with _nv suffix) need |
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83 // to be updated together, or else the devirtualization will break. |
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84 // |
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85 // Providing default implementations of the _nv functions unfortunately |
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86 // removes the compile-time safeness, but reduces the clutter for the |
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87 // ExtendedOopClosures that don't need to walk the metadata. Currently, |
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88 // only CMS needs these. |
941 | 89 |
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90 virtual bool do_metadata() { return do_metadata_nv(); } |
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91 bool do_metadata_v() { return do_metadata(); } |
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92 bool do_metadata_nv() { return false; } |
0 | 93 |
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94 virtual void do_klass(Klass* k) { do_klass_nv(k); } |
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95 void do_klass_v(Klass* k) { do_klass(k); } |
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96 void do_klass_nv(Klass* k) { ShouldNotReachHere(); } |
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97 |
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98 virtual void do_class_loader_data(ClassLoaderData* cld) { ShouldNotReachHere(); } |
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99 |
0 | 100 // Controls how prefetching is done for invocations of this closure. |
101 Prefetch::style prefetch_style() { // Note that this is non-virtual. | |
102 return Prefetch::do_none; | |
103 } | |
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104 |
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105 // True iff this closure may be safely applied more than once to an oop |
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106 // location without an intervening "major reset" (like the end of a GC). |
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107 virtual bool idempotent() { return false; } |
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108 virtual bool apply_to_weak_ref_discovered_field() { return false; } |
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109 }; |
935 | 110 |
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111 // Wrapper closure only used to implement oop_iterate_no_header(). |
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112 class NoHeaderExtendedOopClosure : public ExtendedOopClosure { |
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113 OopClosure* _wrapped_closure; |
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114 public: |
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115 NoHeaderExtendedOopClosure(OopClosure* cl) : _wrapped_closure(cl) {} |
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116 // Warning: this calls the virtual version do_oop in the the wrapped closure. |
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117 void do_oop_nv(oop* p) { _wrapped_closure->do_oop(p); } |
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118 void do_oop_nv(narrowOop* p) { _wrapped_closure->do_oop(p); } |
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119 |
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120 void do_oop(oop* p) { assert(false, "Only the _nv versions should be used"); |
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121 _wrapped_closure->do_oop(p); } |
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122 void do_oop(narrowOop* p) { assert(false, "Only the _nv versions should be used"); |
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123 _wrapped_closure->do_oop(p);} |
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124 }; |
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125 |
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126 class KlassClosure : public Closure { |
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127 public: |
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128 virtual void do_klass(Klass* k) = 0; |
0 | 129 }; |
130 | |
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131 class KlassToOopClosure : public KlassClosure { |
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132 OopClosure* _oop_closure; |
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133 public: |
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134 KlassToOopClosure(OopClosure* oop_closure) : _oop_closure(oop_closure) {} |
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135 virtual void do_klass(Klass* k); |
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136 }; |
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137 |
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138 class CLDToOopClosure { |
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139 OopClosure* _oop_closure; |
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140 KlassToOopClosure _klass_closure; |
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141 bool _must_claim_cld; |
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142 |
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143 public: |
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144 CLDToOopClosure(OopClosure* oop_closure, bool must_claim_cld = true) : |
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145 _oop_closure(oop_closure), |
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146 _klass_closure(oop_closure), |
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147 _must_claim_cld(must_claim_cld) {} |
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148 |
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149 void do_cld(ClassLoaderData* cld); |
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150 }; |
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151 |
0 | 152 // ObjectClosure is used for iterating through an object space |
153 | |
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154 class ObjectClosure : public Closure { |
0 | 155 public: |
156 // Called for each object. | |
157 virtual void do_object(oop obj) = 0; | |
158 }; | |
159 | |
160 | |
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161 class BoolObjectClosure : public Closure { |
0 | 162 public: |
163 virtual bool do_object_b(oop obj) = 0; | |
164 }; | |
165 | |
166 // Applies an oop closure to all ref fields in objects iterated over in an | |
167 // object iteration. | |
168 class ObjectToOopClosure: public ObjectClosure { | |
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169 ExtendedOopClosure* _cl; |
0 | 170 public: |
171 void do_object(oop obj); | |
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172 ObjectToOopClosure(ExtendedOopClosure* cl) : _cl(cl) {} |
0 | 173 }; |
174 | |
175 // A version of ObjectClosure with "memory" (see _previous_address below) | |
176 class UpwardsObjectClosure: public BoolObjectClosure { | |
177 HeapWord* _previous_address; | |
178 public: | |
179 UpwardsObjectClosure() : _previous_address(NULL) { } | |
180 void set_previous(HeapWord* addr) { _previous_address = addr; } | |
181 HeapWord* previous() { return _previous_address; } | |
182 // A return value of "true" can be used by the caller to decide | |
183 // if this object's end should *NOT* be recorded in | |
184 // _previous_address above. | |
185 virtual bool do_object_bm(oop obj, MemRegion mr) = 0; | |
186 }; | |
187 | |
188 // A version of ObjectClosure that is expected to be robust | |
189 // in the face of possibly uninitialized objects. | |
190 class ObjectClosureCareful : public ObjectClosure { | |
191 public: | |
192 virtual size_t do_object_careful_m(oop p, MemRegion mr) = 0; | |
193 virtual size_t do_object_careful(oop p) = 0; | |
194 }; | |
195 | |
196 // The following are used in CompactibleFreeListSpace and | |
197 // ConcurrentMarkSweepGeneration. | |
198 | |
199 // Blk closure (abstract class) | |
200 class BlkClosure : public StackObj { | |
201 public: | |
202 virtual size_t do_blk(HeapWord* addr) = 0; | |
203 }; | |
204 | |
205 // A version of BlkClosure that is expected to be robust | |
206 // in the face of possibly uninitialized objects. | |
207 class BlkClosureCareful : public BlkClosure { | |
208 public: | |
209 size_t do_blk(HeapWord* addr) { | |
210 guarantee(false, "call do_blk_careful instead"); | |
211 return 0; | |
212 } | |
213 virtual size_t do_blk_careful(HeapWord* addr) = 0; | |
214 }; | |
215 | |
216 // SpaceClosure is used for iterating over spaces | |
217 | |
218 class Space; | |
219 class CompactibleSpace; | |
220 | |
221 class SpaceClosure : public StackObj { | |
222 public: | |
223 // Called for each space | |
224 virtual void do_space(Space* s) = 0; | |
225 }; | |
226 | |
227 class CompactibleSpaceClosure : public StackObj { | |
228 public: | |
229 // Called for each compactible space | |
230 virtual void do_space(CompactibleSpace* s) = 0; | |
231 }; | |
232 | |
233 | |
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234 // CodeBlobClosure is used for iterating through code blobs |
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235 // in the code cache or on thread stacks |
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236 |
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237 class CodeBlobClosure : public Closure { |
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238 public: |
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239 // Called for each code blob. |
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240 virtual void do_code_blob(CodeBlob* cb) = 0; |
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241 }; |
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242 |
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243 |
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244 class MarkingCodeBlobClosure : public CodeBlobClosure { |
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245 public: |
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246 // Called for each code blob, but at most once per unique blob. |
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247 virtual void do_newly_marked_nmethod(nmethod* nm) = 0; |
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248 |
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249 virtual void do_code_blob(CodeBlob* cb); |
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250 // = { if (!nmethod(cb)->test_set_oops_do_mark()) do_newly_marked_nmethod(cb); } |
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251 |
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252 class MarkScope : public StackObj { |
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253 protected: |
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254 bool _active; |
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255 public: |
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256 MarkScope(bool activate = true); |
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257 // = { if (active) nmethod::oops_do_marking_prologue(); } |
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258 ~MarkScope(); |
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259 // = { if (active) nmethod::oops_do_marking_epilogue(); } |
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260 }; |
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261 }; |
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262 |
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263 |
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264 // Applies an oop closure to all ref fields in code blobs |
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265 // iterated over in an object iteration. |
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266 class CodeBlobToOopClosure: public MarkingCodeBlobClosure { |
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267 OopClosure* _cl; |
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268 bool _do_marking; |
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269 public: |
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270 virtual void do_newly_marked_nmethod(nmethod* cb); |
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271 // = { cb->oops_do(_cl); } |
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272 virtual void do_code_blob(CodeBlob* cb); |
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273 // = { if (_do_marking) super::do_code_blob(cb); else cb->oops_do(_cl); } |
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274 CodeBlobToOopClosure(OopClosure* cl, bool do_marking) |
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275 : _cl(cl), _do_marking(do_marking) {} |
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276 }; |
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277 |
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278 |
0 | 279 |
280 // MonitorClosure is used for iterating over monitors in the monitors cache | |
281 | |
282 class ObjectMonitor; | |
283 | |
284 class MonitorClosure : public StackObj { | |
285 public: | |
286 // called for each monitor in cache | |
287 virtual void do_monitor(ObjectMonitor* m) = 0; | |
288 }; | |
289 | |
290 // A closure that is applied without any arguments. | |
291 class VoidClosure : public StackObj { | |
292 public: | |
293 // I would have liked to declare this a pure virtual, but that breaks | |
294 // in mysterious ways, for unknown reasons. | |
295 virtual void do_void(); | |
296 }; | |
297 | |
298 | |
299 // YieldClosure is intended for use by iteration loops | |
300 // to incrementalize their work, allowing interleaving | |
301 // of an interruptable task so as to allow other | |
302 // threads to run (which may not otherwise be able to access | |
303 // exclusive resources, for instance). Additionally, the | |
304 // closure also allows for aborting an ongoing iteration | |
305 // by means of checking the return value from the polling | |
306 // call. | |
307 class YieldClosure : public StackObj { | |
308 public: | |
309 virtual bool should_return() = 0; | |
310 }; | |
311 | |
312 // Abstract closure for serializing data (read or write). | |
313 | |
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314 class SerializeClosure : public Closure { |
0 | 315 public: |
316 // Return bool indicating whether closure implements read or write. | |
317 virtual bool reading() const = 0; | |
318 | |
319 // Read/write the void pointer pointed to by p. | |
320 virtual void do_ptr(void** p) = 0; | |
321 | |
322 // Read/write the region specified. | |
323 virtual void do_region(u_char* start, size_t size) = 0; | |
324 | |
325 // Check/write the tag. If reading, then compare the tag against | |
326 // the passed in value and fail is they don't match. This allows | |
327 // for verification that sections of the serialized data are of the | |
328 // correct length. | |
329 virtual void do_tag(int tag) = 0; | |
330 }; | |
935 | 331 |
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332 class SymbolClosure : public StackObj { |
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333 public: |
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334 virtual void do_symbol(Symbol**) = 0; |
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335 |
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336 // Clear LSB in symbol address; it can be set by CPSlot. |
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337 static Symbol* load_symbol(Symbol** p) { |
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338 return (Symbol*)(intptr_t(*p) & ~1); |
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339 } |
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340 |
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341 // Store symbol, adjusting new pointer if the original pointer was adjusted |
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342 // (symbol references in constant pool slots have their LSB set to 1). |
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343 static void store_symbol(Symbol** p, Symbol* sym) { |
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344 *p = (Symbol*)(intptr_t(sym) | (intptr_t(*p) & 1)); |
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345 } |
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346 }; |
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347 |
1972 | 348 #endif // SHARE_VM_MEMORY_ITERATOR_HPP |