Mercurial > hg > graal-compiler
annotate src/share/vm/memory/iterator.hpp @ 2477:3449f5e02cc4
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date | Tue, 12 Apr 2011 14:18:53 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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 |
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293 class SymbolClosure : public StackObj { |
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294 public: |
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295 virtual void do_symbol(Symbol**) = 0; |
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296 |
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297 // Clear LSB in symbol address; it can be set by CPSlot. |
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298 static Symbol* load_symbol(Symbol** p) { |
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299 return (Symbol*)(intptr_t(*p) & ~1); |
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300 } |
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301 |
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302 // Store symbol, adjusting new pointer if the original pointer was adjusted |
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303 // (symbol references in constant pool slots have their LSB set to 1). |
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304 static void store_symbol(Symbol** p, Symbol* sym) { |
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305 *p = (Symbol*)(intptr_t(sym) | (intptr_t(*p) & 1)); |
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306 } |
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307 }; |
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308 |
935 | 309 #ifdef ASSERT |
310 // This class is used to flag phases of a collection that | |
311 // can unload classes and which should override the | |
312 // should_remember_klasses() and remember_klass() of OopClosure. | |
313 // The _must_remember_klasses is set in the contructor and restored | |
314 // in the destructor. _must_remember_klasses is checked in assertions | |
315 // in the OopClosure implementations of should_remember_klasses() and | |
316 // remember_klass() and the expectation is that the OopClosure | |
317 // implementation should not be in use if _must_remember_klasses is set. | |
318 // Instances of RememberKlassesChecker can be place in | |
319 // marking phases of collections which can do class unloading. | |
320 // RememberKlassesChecker can be passed "false" to turn off checking. | |
321 // It is used by CMS when CMS yields to a different collector. | |
322 class RememberKlassesChecker: StackObj { | |
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323 bool _saved_state; |
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324 bool _do_check; |
935 | 325 public: |
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326 RememberKlassesChecker(bool checking_on) : _saved_state(false), |
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327 _do_check(true) { |
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328 // The ClassUnloading unloading flag affects the collectors except |
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329 // for CMS. |
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330 // CMS unloads classes if CMSClassUnloadingEnabled is true or |
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331 // if ExplicitGCInvokesConcurrentAndUnloadsClasses is true and |
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332 // the current collection is an explicit collection. Turning |
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333 // on the checking in general for |
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334 // ExplicitGCInvokesConcurrentAndUnloadsClasses and |
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335 // UseConcMarkSweepGC should not lead to false positives. |
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336 _do_check = |
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337 ClassUnloading && !UseConcMarkSweepGC || |
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338 CMSClassUnloadingEnabled && UseConcMarkSweepGC || |
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339 ExplicitGCInvokesConcurrentAndUnloadsClasses && UseConcMarkSweepGC; |
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340 if (_do_check) { |
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341 _saved_state = OopClosure::must_remember_klasses(); |
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342 OopClosure::set_must_remember_klasses(checking_on); |
935 | 343 } |
344 } | |
345 ~RememberKlassesChecker() { | |
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346 if (_do_check) { |
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347 OopClosure::set_must_remember_klasses(_saved_state); |
935 | 348 } |
349 } | |
350 }; | |
351 #endif // ASSERT | |
1972 | 352 |
353 #endif // SHARE_VM_MEMORY_ITERATOR_HPP |