Mercurial > hg > truffle
annotate src/share/vm/memory/iterator.hpp @ 989:148e5441d916
6863023: need non-perm oops in code cache for JSR 292
Summary: Make a special root-list for those few nmethods which might contain non-perm oops.
Reviewed-by: twisti, kvn, never, jmasa, ysr
| author | jrose |
|---|---|
| date | Tue, 15 Sep 2009 21:53:47 -0700 |
| parents | 1ee8caae33af |
| children | 54b3b351d6f9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 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 // The following classes are C++ `closures` for iterating over objects, roots and spaces | |
| 26 | |
|
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27 class CodeBlob; |
| 0 | 28 class ReferenceProcessor; |
| 29 | |
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30 // Closure provides abortability. |
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31 |
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32 class Closure : public StackObj { |
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33 protected: |
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34 bool _abort; |
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35 void set_abort() { _abort = true; } |
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36 public: |
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37 Closure() : _abort(false) {} |
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38 // A subtype can use this mechanism to indicate to some iterator mapping |
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39 // functions that the iteration should cease. |
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40 bool abort() { return _abort; } |
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41 void clear_abort() { _abort = false; } |
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42 }; |
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43 |
| 0 | 44 // OopClosure is used for iterating through roots (oop*) |
| 45 | |
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46 class OopClosure : public Closure { |
| 0 | 47 public: |
| 48 ReferenceProcessor* _ref_processor; | |
| 49 OopClosure(ReferenceProcessor* rp) : _ref_processor(rp) { } | |
| 50 OopClosure() : _ref_processor(NULL) { } | |
| 51 virtual void do_oop(oop* o) = 0; | |
| 52 virtual void do_oop_v(oop* o) { do_oop(o); } | |
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53 virtual void do_oop(narrowOop* o) = 0; |
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54 virtual void do_oop_v(narrowOop* o) { do_oop(o); } |
| 0 | 55 |
| 56 // In support of post-processing of weak links of KlassKlass objects; | |
| 57 // see KlassKlass::oop_oop_iterate(). | |
| 58 virtual const bool should_remember_klasses() const { return false; } | |
| 59 virtual void remember_klass(Klass* k) { /* do nothing */ } | |
| 60 | |
| 61 // The methods below control how object iterations invoking this closure | |
| 62 // should be performed: | |
| 63 | |
| 64 // If "true", invoke on header klass field. | |
| 65 bool do_header() { return true; } // Note that this is non-virtual. | |
| 66 // Controls how prefetching is done for invocations of this closure. | |
| 67 Prefetch::style prefetch_style() { // Note that this is non-virtual. | |
| 68 return Prefetch::do_none; | |
| 69 } | |
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70 |
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71 // True iff this closure may be safely applied more than once to an oop |
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72 // location without an intervening "major reset" (like the end of a GC). |
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73 virtual bool idempotent() { return false; } |
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74 virtual bool apply_to_weak_ref_discovered_field() { return false; } |
| 0 | 75 }; |
| 76 | |
| 77 // ObjectClosure is used for iterating through an object space | |
| 78 | |
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79 class ObjectClosure : public Closure { |
| 0 | 80 public: |
| 81 // Called for each object. | |
| 82 virtual void do_object(oop obj) = 0; | |
| 83 }; | |
| 84 | |
| 85 | |
| 86 class BoolObjectClosure : public ObjectClosure { | |
| 87 public: | |
| 88 virtual bool do_object_b(oop obj) = 0; | |
| 89 }; | |
| 90 | |
| 91 // Applies an oop closure to all ref fields in objects iterated over in an | |
| 92 // object iteration. | |
| 93 class ObjectToOopClosure: public ObjectClosure { | |
| 94 OopClosure* _cl; | |
| 95 public: | |
| 96 void do_object(oop obj); | |
| 97 ObjectToOopClosure(OopClosure* cl) : _cl(cl) {} | |
| 98 }; | |
| 99 | |
| 100 // A version of ObjectClosure with "memory" (see _previous_address below) | |
| 101 class UpwardsObjectClosure: public BoolObjectClosure { | |
| 102 HeapWord* _previous_address; | |
| 103 public: | |
| 104 UpwardsObjectClosure() : _previous_address(NULL) { } | |
| 105 void set_previous(HeapWord* addr) { _previous_address = addr; } | |
| 106 HeapWord* previous() { return _previous_address; } | |
| 107 // A return value of "true" can be used by the caller to decide | |
| 108 // if this object's end should *NOT* be recorded in | |
| 109 // _previous_address above. | |
| 110 virtual bool do_object_bm(oop obj, MemRegion mr) = 0; | |
| 111 }; | |
| 112 | |
| 113 // A version of ObjectClosure that is expected to be robust | |
| 114 // in the face of possibly uninitialized objects. | |
| 115 class ObjectClosureCareful : public ObjectClosure { | |
| 116 public: | |
| 117 virtual size_t do_object_careful_m(oop p, MemRegion mr) = 0; | |
| 118 virtual size_t do_object_careful(oop p) = 0; | |
| 119 }; | |
| 120 | |
| 121 // The following are used in CompactibleFreeListSpace and | |
| 122 // ConcurrentMarkSweepGeneration. | |
| 123 | |
| 124 // Blk closure (abstract class) | |
| 125 class BlkClosure : public StackObj { | |
| 126 public: | |
| 127 virtual size_t do_blk(HeapWord* addr) = 0; | |
| 128 }; | |
| 129 | |
| 130 // A version of BlkClosure that is expected to be robust | |
| 131 // in the face of possibly uninitialized objects. | |
| 132 class BlkClosureCareful : public BlkClosure { | |
| 133 public: | |
| 134 size_t do_blk(HeapWord* addr) { | |
| 135 guarantee(false, "call do_blk_careful instead"); | |
| 136 return 0; | |
| 137 } | |
| 138 virtual size_t do_blk_careful(HeapWord* addr) = 0; | |
| 139 }; | |
| 140 | |
| 141 // SpaceClosure is used for iterating over spaces | |
| 142 | |
| 143 class Space; | |
| 144 class CompactibleSpace; | |
| 145 | |
| 146 class SpaceClosure : public StackObj { | |
| 147 public: | |
| 148 // Called for each space | |
| 149 virtual void do_space(Space* s) = 0; | |
| 150 }; | |
| 151 | |
| 152 class CompactibleSpaceClosure : public StackObj { | |
| 153 public: | |
| 154 // Called for each compactible space | |
| 155 virtual void do_space(CompactibleSpace* s) = 0; | |
| 156 }; | |
| 157 | |
| 158 | |
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159 // CodeBlobClosure is used for iterating through code blobs |
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160 // in the code cache or on thread stacks |
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161 |
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162 class CodeBlobClosure : public Closure { |
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163 public: |
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164 // Called for each code blob. |
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165 virtual void do_code_blob(CodeBlob* cb) = 0; |
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166 }; |
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167 |
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168 |
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169 class MarkingCodeBlobClosure : public CodeBlobClosure { |
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170 public: |
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171 // Called for each code blob, but at most once per unique blob. |
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172 virtual void do_newly_marked_nmethod(CodeBlob* cb) = 0; |
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173 |
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174 virtual void do_code_blob(CodeBlob* cb); |
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175 // = { if (!nmethod(cb)->test_set_oops_do_mark()) do_newly_marked_nmethod(cb); } |
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176 |
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177 class MarkScope : public StackObj { |
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178 protected: |
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179 bool _active; |
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180 public: |
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181 MarkScope(bool activate = true); |
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182 // = { if (active) nmethod::oops_do_marking_prologue(); } |
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183 ~MarkScope(); |
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184 // = { if (active) nmethod::oops_do_marking_epilogue(); } |
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185 }; |
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186 }; |
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187 |
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188 |
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189 // Applies an oop closure to all ref fields in code blobs |
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190 // iterated over in an object iteration. |
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191 class CodeBlobToOopClosure: public MarkingCodeBlobClosure { |
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192 OopClosure* _cl; |
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193 bool _do_marking; |
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194 public: |
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195 virtual void do_newly_marked_nmethod(CodeBlob* cb); |
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196 // = { cb->oops_do(_cl); } |
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197 virtual void do_code_blob(CodeBlob* cb); |
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198 // = { if (_do_marking) super::do_code_blob(cb); else cb->oops_do(_cl); } |
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199 CodeBlobToOopClosure(OopClosure* cl, bool do_marking) |
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200 : _cl(cl), _do_marking(do_marking) {} |
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201 }; |
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202 |
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203 |
| 0 | 204 |
| 205 // MonitorClosure is used for iterating over monitors in the monitors cache | |
| 206 | |
| 207 class ObjectMonitor; | |
| 208 | |
| 209 class MonitorClosure : public StackObj { | |
| 210 public: | |
| 211 // called for each monitor in cache | |
| 212 virtual void do_monitor(ObjectMonitor* m) = 0; | |
| 213 }; | |
| 214 | |
| 215 // A closure that is applied without any arguments. | |
| 216 class VoidClosure : public StackObj { | |
| 217 public: | |
| 218 // I would have liked to declare this a pure virtual, but that breaks | |
| 219 // in mysterious ways, for unknown reasons. | |
| 220 virtual void do_void(); | |
| 221 }; | |
| 222 | |
| 223 | |
| 224 // YieldClosure is intended for use by iteration loops | |
| 225 // to incrementalize their work, allowing interleaving | |
| 226 // of an interruptable task so as to allow other | |
| 227 // threads to run (which may not otherwise be able to access | |
| 228 // exclusive resources, for instance). Additionally, the | |
| 229 // closure also allows for aborting an ongoing iteration | |
| 230 // by means of checking the return value from the polling | |
| 231 // call. | |
| 232 class YieldClosure : public StackObj { | |
| 233 public: | |
| 234 virtual bool should_return() = 0; | |
| 235 }; | |
| 236 | |
| 237 // Abstract closure for serializing data (read or write). | |
| 238 | |
| 239 class SerializeOopClosure : public OopClosure { | |
| 240 public: | |
| 241 // Return bool indicating whether closure implements read or write. | |
| 242 virtual bool reading() const = 0; | |
| 243 | |
| 244 // Read/write the int pointed to by i. | |
| 245 virtual void do_int(int* i) = 0; | |
| 246 | |
| 247 // Read/write the size_t pointed to by i. | |
| 248 virtual void do_size_t(size_t* i) = 0; | |
| 249 | |
| 250 // Read/write the void pointer pointed to by p. | |
| 251 virtual void do_ptr(void** p) = 0; | |
| 252 | |
| 253 // Read/write the HeapWord pointer pointed to be p. | |
| 254 virtual void do_ptr(HeapWord** p) = 0; | |
| 255 | |
| 256 // Read/write the region specified. | |
| 257 virtual void do_region(u_char* start, size_t size) = 0; | |
| 258 | |
| 259 // Check/write the tag. If reading, then compare the tag against | |
| 260 // the passed in value and fail is they don't match. This allows | |
| 261 // for verification that sections of the serialized data are of the | |
| 262 // correct length. | |
| 263 virtual void do_tag(int tag) = 0; | |
| 264 }; |