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annotate src/share/vm/memory/iterator.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | 3582bf76420e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, 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; |
| 0 | 39 |
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40 // Closure provides abortability. |
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41 |
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42 class Closure : public StackObj { |
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43 protected: |
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44 bool _abort; |
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45 void set_abort() { _abort = true; } |
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46 public: |
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47 Closure() : _abort(false) {} |
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48 // A subtype can use this mechanism to indicate to some iterator mapping |
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49 // functions that the iteration should cease. |
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50 bool abort() { return _abort; } |
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51 void clear_abort() { _abort = false; } |
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52 }; |
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53 |
| 0 | 54 // OopClosure is used for iterating through roots (oop*) |
| 55 | |
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56 class OopClosure : public Closure { |
| 0 | 57 public: |
| 58 ReferenceProcessor* _ref_processor; | |
| 59 OopClosure(ReferenceProcessor* rp) : _ref_processor(rp) { } | |
| 60 OopClosure() : _ref_processor(NULL) { } | |
| 61 virtual void do_oop(oop* o) = 0; | |
| 62 virtual void do_oop_v(oop* o) { do_oop(o); } | |
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63 virtual void do_oop(narrowOop* o) = 0; |
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64 virtual void do_oop_v(narrowOop* o) { do_oop(o); } |
| 0 | 65 |
| 66 // In support of post-processing of weak links of KlassKlass objects; | |
| 67 // see KlassKlass::oop_oop_iterate(). | |
| 935 | 68 |
| 69 virtual const bool should_remember_klasses() const { | |
| 70 assert(!must_remember_klasses(), "Should have overriden this method."); | |
| 71 return false; | |
| 72 } | |
| 73 | |
| 0 | 74 virtual void remember_klass(Klass* k) { /* do nothing */ } |
| 75 | |
| 941 | 76 // In support of post-processing of weak references in |
| 77 // ProfileData (MethodDataOop) objects; see, for example, | |
| 78 // VirtualCallData::oop_iterate(). | |
| 79 virtual const bool should_remember_mdo() const { return false; } | |
| 80 virtual void remember_mdo(DataLayout* v) { /* do nothing */ } | |
| 81 | |
| 0 | 82 // The methods below control how object iterations invoking this closure |
| 83 // should be performed: | |
| 84 | |
| 85 // If "true", invoke on header klass field. | |
| 86 bool do_header() { return true; } // Note that this is non-virtual. | |
| 87 // Controls how prefetching is done for invocations of this closure. | |
| 88 Prefetch::style prefetch_style() { // Note that this is non-virtual. | |
| 89 return Prefetch::do_none; | |
| 90 } | |
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91 |
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92 // True iff this closure may be safely applied more than once to an oop |
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93 // location without an intervening "major reset" (like the end of a GC). |
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94 virtual bool idempotent() { return false; } |
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95 virtual bool apply_to_weak_ref_discovered_field() { return false; } |
| 935 | 96 |
| 97 #ifdef ASSERT | |
| 98 static bool _must_remember_klasses; | |
| 99 static bool must_remember_klasses(); | |
| 100 static void set_must_remember_klasses(bool v); | |
| 101 #endif | |
| 0 | 102 }; |
| 103 | |
| 104 // ObjectClosure is used for iterating through an object space | |
| 105 | |
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106 class ObjectClosure : public Closure { |
| 0 | 107 public: |
| 108 // Called for each object. | |
| 109 virtual void do_object(oop obj) = 0; | |
| 110 }; | |
| 111 | |
| 112 | |
| 113 class BoolObjectClosure : public ObjectClosure { | |
| 114 public: | |
| 115 virtual bool do_object_b(oop obj) = 0; | |
| 116 }; | |
| 117 | |
| 118 // Applies an oop closure to all ref fields in objects iterated over in an | |
| 119 // object iteration. | |
| 120 class ObjectToOopClosure: public ObjectClosure { | |
| 121 OopClosure* _cl; | |
| 122 public: | |
| 123 void do_object(oop obj); | |
| 124 ObjectToOopClosure(OopClosure* cl) : _cl(cl) {} | |
| 125 }; | |
| 126 | |
| 127 // A version of ObjectClosure with "memory" (see _previous_address below) | |
| 128 class UpwardsObjectClosure: public BoolObjectClosure { | |
| 129 HeapWord* _previous_address; | |
| 130 public: | |
| 131 UpwardsObjectClosure() : _previous_address(NULL) { } | |
| 132 void set_previous(HeapWord* addr) { _previous_address = addr; } | |
| 133 HeapWord* previous() { return _previous_address; } | |
| 134 // A return value of "true" can be used by the caller to decide | |
| 135 // if this object's end should *NOT* be recorded in | |
| 136 // _previous_address above. | |
| 137 virtual bool do_object_bm(oop obj, MemRegion mr) = 0; | |
| 138 }; | |
| 139 | |
| 140 // A version of ObjectClosure that is expected to be robust | |
| 141 // in the face of possibly uninitialized objects. | |
| 142 class ObjectClosureCareful : public ObjectClosure { | |
| 143 public: | |
| 144 virtual size_t do_object_careful_m(oop p, MemRegion mr) = 0; | |
| 145 virtual size_t do_object_careful(oop p) = 0; | |
| 146 }; | |
| 147 | |
| 148 // The following are used in CompactibleFreeListSpace and | |
| 149 // ConcurrentMarkSweepGeneration. | |
| 150 | |
| 151 // Blk closure (abstract class) | |
| 152 class BlkClosure : public StackObj { | |
| 153 public: | |
| 154 virtual size_t do_blk(HeapWord* addr) = 0; | |
| 155 }; | |
| 156 | |
| 157 // A version of BlkClosure that is expected to be robust | |
| 158 // in the face of possibly uninitialized objects. | |
| 159 class BlkClosureCareful : public BlkClosure { | |
| 160 public: | |
| 161 size_t do_blk(HeapWord* addr) { | |
| 162 guarantee(false, "call do_blk_careful instead"); | |
| 163 return 0; | |
| 164 } | |
| 165 virtual size_t do_blk_careful(HeapWord* addr) = 0; | |
| 166 }; | |
| 167 | |
| 168 // SpaceClosure is used for iterating over spaces | |
| 169 | |
| 170 class Space; | |
| 171 class CompactibleSpace; | |
| 172 | |
| 173 class SpaceClosure : public StackObj { | |
| 174 public: | |
| 175 // Called for each space | |
| 176 virtual void do_space(Space* s) = 0; | |
| 177 }; | |
| 178 | |
| 179 class CompactibleSpaceClosure : public StackObj { | |
| 180 public: | |
| 181 // Called for each compactible space | |
| 182 virtual void do_space(CompactibleSpace* s) = 0; | |
| 183 }; | |
| 184 | |
| 185 | |
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186 // CodeBlobClosure is used for iterating through code blobs |
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187 // in the code cache or on thread stacks |
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188 |
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189 class CodeBlobClosure : public Closure { |
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190 public: |
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191 // Called for each code blob. |
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192 virtual void do_code_blob(CodeBlob* cb) = 0; |
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193 }; |
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194 |
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195 |
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196 class MarkingCodeBlobClosure : public CodeBlobClosure { |
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197 public: |
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198 // Called for each code blob, but at most once per unique blob. |
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199 virtual void do_newly_marked_nmethod(nmethod* nm) = 0; |
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200 |
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201 virtual void do_code_blob(CodeBlob* cb); |
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202 // = { if (!nmethod(cb)->test_set_oops_do_mark()) do_newly_marked_nmethod(cb); } |
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203 |
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204 class MarkScope : public StackObj { |
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205 protected: |
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206 bool _active; |
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207 public: |
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208 MarkScope(bool activate = true); |
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209 // = { if (active) nmethod::oops_do_marking_prologue(); } |
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210 ~MarkScope(); |
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211 // = { if (active) nmethod::oops_do_marking_epilogue(); } |
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212 }; |
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213 }; |
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214 |
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215 |
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216 // Applies an oop closure to all ref fields in code blobs |
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217 // iterated over in an object iteration. |
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218 class CodeBlobToOopClosure: public MarkingCodeBlobClosure { |
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219 OopClosure* _cl; |
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220 bool _do_marking; |
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221 public: |
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222 virtual void do_newly_marked_nmethod(nmethod* cb); |
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223 // = { cb->oops_do(_cl); } |
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224 virtual void do_code_blob(CodeBlob* cb); |
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225 // = { if (_do_marking) super::do_code_blob(cb); else cb->oops_do(_cl); } |
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226 CodeBlobToOopClosure(OopClosure* cl, bool do_marking) |
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227 : _cl(cl), _do_marking(do_marking) {} |
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228 }; |
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229 |
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230 |
| 0 | 231 |
| 232 // MonitorClosure is used for iterating over monitors in the monitors cache | |
| 233 | |
| 234 class ObjectMonitor; | |
| 235 | |
| 236 class MonitorClosure : public StackObj { | |
| 237 public: | |
| 238 // called for each monitor in cache | |
| 239 virtual void do_monitor(ObjectMonitor* m) = 0; | |
| 240 }; | |
| 241 | |
| 242 // A closure that is applied without any arguments. | |
| 243 class VoidClosure : public StackObj { | |
| 244 public: | |
| 245 // I would have liked to declare this a pure virtual, but that breaks | |
| 246 // in mysterious ways, for unknown reasons. | |
| 247 virtual void do_void(); | |
| 248 }; | |
| 249 | |
| 250 | |
| 251 // YieldClosure is intended for use by iteration loops | |
| 252 // to incrementalize their work, allowing interleaving | |
| 253 // of an interruptable task so as to allow other | |
| 254 // threads to run (which may not otherwise be able to access | |
| 255 // exclusive resources, for instance). Additionally, the | |
| 256 // closure also allows for aborting an ongoing iteration | |
| 257 // by means of checking the return value from the polling | |
| 258 // call. | |
| 259 class YieldClosure : public StackObj { | |
| 260 public: | |
| 261 virtual bool should_return() = 0; | |
| 262 }; | |
| 263 | |
| 264 // Abstract closure for serializing data (read or write). | |
| 265 | |
| 266 class SerializeOopClosure : public OopClosure { | |
| 267 public: | |
| 268 // Return bool indicating whether closure implements read or write. | |
| 269 virtual bool reading() const = 0; | |
| 270 | |
| 271 // Read/write the int pointed to by i. | |
| 272 virtual void do_int(int* i) = 0; | |
| 273 | |
| 274 // Read/write the size_t pointed to by i. | |
| 275 virtual void do_size_t(size_t* i) = 0; | |
| 276 | |
| 277 // Read/write the void pointer pointed to by p. | |
| 278 virtual void do_ptr(void** p) = 0; | |
| 279 | |
| 280 // Read/write the HeapWord pointer pointed to be p. | |
| 281 virtual void do_ptr(HeapWord** p) = 0; | |
| 282 | |
| 283 // Read/write the region specified. | |
| 284 virtual void do_region(u_char* start, size_t size) = 0; | |
| 285 | |
| 286 // Check/write the tag. If reading, then compare the tag against | |
| 287 // the passed in value and fail is they don't match. This allows | |
| 288 // for verification that sections of the serialized data are of the | |
| 289 // correct length. | |
| 290 virtual void do_tag(int tag) = 0; | |
| 291 }; | |
| 935 | 292 |
| 293 #ifdef ASSERT | |
| 294 // This class is used to flag phases of a collection that | |
| 295 // can unload classes and which should override the | |
| 296 // should_remember_klasses() and remember_klass() of OopClosure. | |
| 297 // The _must_remember_klasses is set in the contructor and restored | |
| 298 // in the destructor. _must_remember_klasses is checked in assertions | |
| 299 // in the OopClosure implementations of should_remember_klasses() and | |
| 300 // remember_klass() and the expectation is that the OopClosure | |
| 301 // implementation should not be in use if _must_remember_klasses is set. | |
| 302 // Instances of RememberKlassesChecker can be place in | |
| 303 // marking phases of collections which can do class unloading. | |
| 304 // RememberKlassesChecker can be passed "false" to turn off checking. | |
| 305 // It is used by CMS when CMS yields to a different collector. | |
| 306 class RememberKlassesChecker: StackObj { | |
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307 bool _saved_state; |
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308 bool _do_check; |
| 935 | 309 public: |
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310 RememberKlassesChecker(bool checking_on) : _saved_state(false), |
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311 _do_check(true) { |
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312 // The ClassUnloading unloading flag affects the collectors except |
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313 // for CMS. |
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314 // CMS unloads classes if CMSClassUnloadingEnabled is true or |
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315 // if ExplicitGCInvokesConcurrentAndUnloadsClasses is true and |
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316 // the current collection is an explicit collection. Turning |
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317 // on the checking in general for |
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318 // ExplicitGCInvokesConcurrentAndUnloadsClasses and |
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319 // UseConcMarkSweepGC should not lead to false positives. |
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320 _do_check = |
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321 ClassUnloading && !UseConcMarkSweepGC || |
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322 CMSClassUnloadingEnabled && UseConcMarkSweepGC || |
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323 ExplicitGCInvokesConcurrentAndUnloadsClasses && UseConcMarkSweepGC; |
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324 if (_do_check) { |
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325 _saved_state = OopClosure::must_remember_klasses(); |
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326 OopClosure::set_must_remember_klasses(checking_on); |
| 935 | 327 } |
| 328 } | |
| 329 ~RememberKlassesChecker() { | |
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330 if (_do_check) { |
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331 OopClosure::set_must_remember_klasses(_saved_state); |
| 935 | 332 } |
| 333 } | |
| 334 }; | |
| 335 #endif // ASSERT | |
| 1972 | 336 |
| 337 #endif // SHARE_VM_MEMORY_ITERATOR_HPP |