Mercurial > hg > truffle
annotate src/share/vm/memory/compactingPermGenGen.cpp @ 2645:b2c1e959be46
Clean up around BlockBegin / StdEntry.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 14:34:29 +0200 |
parents | 1d1603768966 |
children | 77a488cd4af2 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 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 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "memory/compactingPermGenGen.hpp" | |
29 #include "memory/filemap.hpp" | |
30 #include "memory/genOopClosures.inline.hpp" | |
31 #include "memory/generation.inline.hpp" | |
32 #include "memory/generationSpec.hpp" | |
33 #include "oops/oop.inline.hpp" | |
34 #include "runtime/java.hpp" | |
35 #ifndef SERIALGC | |
36 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.inline.hpp" | |
37 #endif | |
0 | 38 |
39 | |
47
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40 // An ObjectClosure helper: Recursively adjust all pointers in an object |
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41 // and all objects by referenced it. Clear marks on objects in order to |
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42 // prevent visiting any object twice. This helper is used when the |
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43 // RedefineClasses() API has been called. |
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44 |
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45 class AdjustSharedObjectClosure : public ObjectClosure { |
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46 public: |
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47 void do_object(oop obj) { |
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48 if (obj->is_shared_readwrite()) { |
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49 if (obj->mark()->is_marked()) { |
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50 obj->init_mark(); // Don't revisit this object. |
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51 obj->adjust_pointers(); // Adjust this object's references. |
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52 } |
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53 } |
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54 } |
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55 }; |
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56 |
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57 |
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58 // An OopClosure helper: Recursively adjust all pointers in an object |
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59 // and all objects by referenced it. Clear marks on objects in order |
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60 // to prevent visiting any object twice. |
0 | 61 |
62 class RecursiveAdjustSharedObjectClosure : public OopClosure { | |
113
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63 protected: |
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64 template <class T> inline void do_oop_work(T* p) { |
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65 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
0 | 66 if (obj->is_shared_readwrite()) { |
67 if (obj->mark()->is_marked()) { | |
68 obj->init_mark(); // Don't revisit this object. | |
69 obj->oop_iterate(this); // Recurse - adjust objects referenced. | |
70 obj->adjust_pointers(); // Adjust this object's references. | |
71 | |
72 // Special case: if a class has a read-only constant pool, | |
73 // then the read-write objects referenced by the pool must | |
74 // have their marks reset. | |
75 | |
76 if (obj->klass() == Universe::instanceKlassKlassObj()) { | |
77 instanceKlass* ik = instanceKlass::cast((klassOop)obj); | |
78 constantPoolOop cp = ik->constants(); | |
79 if (cp->is_shared_readonly()) { | |
80 cp->oop_iterate(this); | |
81 } | |
82 } | |
83 } | |
84 } | |
113
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85 } |
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86 public: |
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87 virtual void do_oop(oop* p) { RecursiveAdjustSharedObjectClosure::do_oop_work(p); } |
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88 virtual void do_oop(narrowOop* p) { RecursiveAdjustSharedObjectClosure::do_oop_work(p); } |
0 | 89 }; |
90 | |
91 | |
92 // We need to go through all placeholders in the system dictionary and | |
93 // try to resolve them into shared classes. Other threads might be in | |
94 // the process of loading a shared class and have strong roots on | |
95 // their stack to the class without having added the class to the | |
96 // dictionary yet. This means the class will be marked during phase 1 | |
97 // but will not be unmarked during the application of the | |
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98 // RecursiveAdjustSharedObjectClosure to the SystemDictionary. |
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99 class TraversePlaceholdersClosure { |
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100 public: |
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101 static void placeholders_do(Symbol* sym, oop loader) { |
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102 if (CompactingPermGenGen::is_shared(sym)) { |
0 | 103 oop k = SystemDictionary::find_shared_class(sym); |
104 if (k != NULL) { | |
105 RecursiveAdjustSharedObjectClosure clo; | |
106 clo.do_oop(&k); | |
107 } | |
108 } | |
109 } | |
110 }; | |
111 | |
112 void CompactingPermGenGen::initialize_performance_counters() { | |
113 | |
114 const char* gen_name = "perm"; | |
115 | |
116 // Generation Counters - generation 2, 1 subspace | |
117 _gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space); | |
118 | |
119 _space_counters = new CSpaceCounters(gen_name, 0, | |
120 _virtual_space.reserved_size(), | |
121 _the_space, _gen_counters); | |
122 } | |
123 | |
124 void CompactingPermGenGen::update_counters() { | |
125 if (UsePerfData) { | |
126 _space_counters->update_all(); | |
127 _gen_counters->update_all(); | |
128 } | |
129 } | |
130 | |
131 | |
132 CompactingPermGenGen::CompactingPermGenGen(ReservedSpace rs, | |
133 ReservedSpace shared_rs, | |
134 size_t initial_byte_size, | |
135 int level, GenRemSet* remset, | |
136 ContiguousSpace* space, | |
137 PermanentGenerationSpec* spec_) : | |
138 OneContigSpaceCardGeneration(rs, initial_byte_size, MinPermHeapExpansion, | |
139 level, remset, space) { | |
140 | |
141 set_spec(spec_); | |
142 if (!UseSharedSpaces && !DumpSharedSpaces) { | |
143 spec()->disable_sharing(); | |
144 } | |
145 | |
146 // Break virtual space into address ranges for all spaces. | |
147 | |
148 if (spec()->enable_shared_spaces()) { | |
149 shared_end = (HeapWord*)(shared_rs.base() + shared_rs.size()); | |
150 misccode_end = shared_end; | |
151 misccode_bottom = misccode_end - heap_word_size(spec()->misc_code_size()); | |
152 miscdata_end = misccode_bottom; | |
153 miscdata_bottom = miscdata_end - heap_word_size(spec()->misc_data_size()); | |
154 readwrite_end = miscdata_bottom; | |
155 readwrite_bottom = | |
156 readwrite_end - heap_word_size(spec()->read_write_size()); | |
157 readonly_end = readwrite_bottom; | |
158 readonly_bottom = | |
159 readonly_end - heap_word_size(spec()->read_only_size()); | |
160 shared_bottom = readonly_bottom; | |
161 unshared_end = shared_bottom; | |
162 assert((char*)shared_bottom == shared_rs.base(), "shared space mismatch"); | |
163 } else { | |
164 shared_end = (HeapWord*)(rs.base() + rs.size()); | |
165 misccode_end = shared_end; | |
166 misccode_bottom = shared_end; | |
167 miscdata_end = shared_end; | |
168 miscdata_bottom = shared_end; | |
169 readwrite_end = shared_end; | |
170 readwrite_bottom = shared_end; | |
171 readonly_end = shared_end; | |
172 readonly_bottom = shared_end; | |
173 shared_bottom = shared_end; | |
174 unshared_end = shared_bottom; | |
175 } | |
176 unshared_bottom = (HeapWord*) rs.base(); | |
177 | |
178 // Verify shared and unshared spaces adjacent. | |
179 assert((char*)shared_bottom == rs.base()+rs.size(), "shared space mismatch"); | |
180 assert(unshared_end > unshared_bottom, "shared space mismatch"); | |
181 | |
182 // Split reserved memory into pieces. | |
183 | |
184 ReservedSpace ro_rs = shared_rs.first_part(spec()->read_only_size(), | |
185 UseSharedSpaces); | |
186 ReservedSpace tmp_rs1 = shared_rs.last_part(spec()->read_only_size()); | |
187 ReservedSpace rw_rs = tmp_rs1.first_part(spec()->read_write_size(), | |
188 UseSharedSpaces); | |
189 ReservedSpace tmp_rs2 = tmp_rs1.last_part(spec()->read_write_size()); | |
190 ReservedSpace md_rs = tmp_rs2.first_part(spec()->misc_data_size(), | |
191 UseSharedSpaces); | |
192 ReservedSpace mc_rs = tmp_rs2.last_part(spec()->misc_data_size()); | |
193 | |
194 _shared_space_size = spec()->read_only_size() | |
195 + spec()->read_write_size() | |
196 + spec()->misc_data_size() | |
197 + spec()->misc_code_size(); | |
198 | |
199 // Allocate the unshared (default) space. | |
200 _the_space = new ContigPermSpace(_bts, | |
201 MemRegion(unshared_bottom, heap_word_size(initial_byte_size))); | |
202 if (_the_space == NULL) | |
203 vm_exit_during_initialization("Could not allocate an unshared" | |
204 " CompactingPermGen Space"); | |
205 | |
206 // Allocate shared spaces | |
207 if (spec()->enable_shared_spaces()) { | |
208 | |
209 // If mapping a shared file, the space is not committed, don't | |
210 // mangle. | |
211 NOT_PRODUCT(bool old_ZapUnusedHeapArea = ZapUnusedHeapArea;) | |
212 NOT_PRODUCT(if (UseSharedSpaces) ZapUnusedHeapArea = false;) | |
213 | |
214 // Commit the memory behind the shared spaces if dumping (not | |
215 // mapping). | |
216 if (DumpSharedSpaces) { | |
217 _ro_vs.initialize(ro_rs, spec()->read_only_size()); | |
218 _rw_vs.initialize(rw_rs, spec()->read_write_size()); | |
219 _md_vs.initialize(md_rs, spec()->misc_data_size()); | |
220 _mc_vs.initialize(mc_rs, spec()->misc_code_size()); | |
221 } | |
222 | |
223 // Allocate the shared spaces. | |
224 _ro_bts = new BlockOffsetSharedArray( | |
225 MemRegion(readonly_bottom, | |
226 heap_word_size(spec()->read_only_size())), | |
227 heap_word_size(spec()->read_only_size())); | |
228 _ro_space = new OffsetTableContigSpace(_ro_bts, | |
229 MemRegion(readonly_bottom, readonly_end)); | |
230 _rw_bts = new BlockOffsetSharedArray( | |
231 MemRegion(readwrite_bottom, | |
232 heap_word_size(spec()->read_write_size())), | |
233 heap_word_size(spec()->read_write_size())); | |
234 _rw_space = new OffsetTableContigSpace(_rw_bts, | |
235 MemRegion(readwrite_bottom, readwrite_end)); | |
236 | |
237 // Restore mangling flag. | |
238 NOT_PRODUCT(ZapUnusedHeapArea = old_ZapUnusedHeapArea;) | |
239 | |
240 if (_ro_space == NULL || _rw_space == NULL) | |
241 vm_exit_during_initialization("Could not allocate a shared space"); | |
242 | |
243 // Cover both shared spaces entirely with cards. | |
244 _rs->resize_covered_region(MemRegion(readonly_bottom, readwrite_end)); | |
245 | |
246 if (UseSharedSpaces) { | |
247 | |
248 // Map in the regions in the shared file. | |
249 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
250 size_t image_alignment = mapinfo->alignment(); | |
251 CollectedHeap* ch = Universe::heap(); | |
252 if ((!mapinfo->map_space(ro, ro_rs, _ro_space)) || | |
253 (!mapinfo->map_space(rw, rw_rs, _rw_space)) || | |
254 (!mapinfo->map_space(md, md_rs, NULL)) || | |
255 (!mapinfo->map_space(mc, mc_rs, NULL)) || | |
256 // check the alignment constraints | |
257 (ch == NULL || ch->kind() != CollectedHeap::GenCollectedHeap || | |
258 image_alignment != | |
259 ((GenCollectedHeap*)ch)->gen_policy()->max_alignment())) { | |
260 // Base addresses didn't match; skip sharing, but continue | |
261 shared_rs.release(); | |
262 spec()->disable_sharing(); | |
263 // If -Xshare:on is specified, print out the error message and exit VM, | |
264 // otherwise, set UseSharedSpaces to false and continue. | |
265 if (RequireSharedSpaces) { | |
266 vm_exit_during_initialization("Unable to use shared archive.", NULL); | |
267 } else { | |
268 FLAG_SET_DEFAULT(UseSharedSpaces, false); | |
269 } | |
270 | |
271 // Note: freeing the block offset array objects does not | |
272 // currently free up the underlying storage. | |
273 delete _ro_bts; | |
274 _ro_bts = NULL; | |
275 delete _ro_space; | |
276 _ro_space = NULL; | |
277 delete _rw_bts; | |
278 _rw_bts = NULL; | |
279 delete _rw_space; | |
280 _rw_space = NULL; | |
281 shared_end = (HeapWord*)(rs.base() + rs.size()); | |
282 _rs->resize_covered_region(MemRegion(shared_bottom, shared_bottom)); | |
283 } | |
284 } | |
285 | |
286 // Reserved region includes shared spaces for oop.is_in_reserved(). | |
287 _reserved.set_end(shared_end); | |
288 | |
289 } else { | |
290 _ro_space = NULL; | |
291 _rw_space = NULL; | |
292 } | |
293 } | |
294 | |
295 | |
296 // Do a complete scan of the shared read write space to catch all | |
297 // objects which contain references to any younger generation. Forward | |
298 // the pointers. Avoid space_iterate, as actually visiting all the | |
299 // objects in the space will page in more objects than we need. | |
300 // Instead, use the system dictionary as strong roots into the read | |
301 // write space. | |
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302 // |
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303 // If a RedefineClasses() call has been made, then we have to iterate |
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304 // over the entire shared read-write space in order to find all the |
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305 // objects that need to be forwarded. For example, it is possible for |
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306 // an nmethod to be found and marked in GC phase-1 only for the nmethod |
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307 // to be freed by the time we reach GC phase-3. The underlying method |
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308 // is still marked, but we can't (easily) find it in GC phase-3 so we |
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309 // blow up in GC phase-4. With RedefineClasses() we want replaced code |
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310 // (EMCP or obsolete) to go away (i.e., be collectible) once it is no |
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311 // longer being executed by any thread so we keep minimal attachments |
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312 // to the replaced code. However, we can't guarantee when those EMCP |
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313 // or obsolete methods will be collected so they may still be out there |
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314 // even after we've severed our minimal attachments. |
0 | 315 |
316 void CompactingPermGenGen::pre_adjust_pointers() { | |
317 if (spec()->enable_shared_spaces()) { | |
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318 if (JvmtiExport::has_redefined_a_class()) { |
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319 // RedefineClasses() requires a brute force approach |
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320 AdjustSharedObjectClosure blk; |
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321 rw_space()->object_iterate(&blk); |
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322 } else { |
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323 RecursiveAdjustSharedObjectClosure blk; |
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324 Universe::oops_do(&blk); |
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325 StringTable::oops_do(&blk); |
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326 SystemDictionary::always_strong_classes_do(&blk); |
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327 SystemDictionary::placeholders_do(TraversePlaceholdersClosure::placeholders_do); |
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328 } |
0 | 329 } |
330 } | |
331 | |
332 | |
333 #ifdef ASSERT | |
334 class VerifyMarksClearedClosure : public ObjectClosure { | |
335 public: | |
336 void do_object(oop obj) { | |
337 assert(SharedSkipVerify || !obj->mark()->is_marked(), | |
338 "Shared oop still marked?"); | |
339 } | |
340 }; | |
341 #endif | |
342 | |
343 | |
344 void CompactingPermGenGen::post_compact() { | |
345 #ifdef ASSERT | |
346 if (!SharedSkipVerify && spec()->enable_shared_spaces()) { | |
347 VerifyMarksClearedClosure blk; | |
348 rw_space()->object_iterate(&blk); | |
349 } | |
350 #endif | |
351 } | |
352 | |
353 | |
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354 // Do not use in time-critical operations due to the possibility of paging |
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355 // in otherwise untouched or previously unread portions of the perm gen, |
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356 // for instance, the shared spaces. NOTE: Because CompactingPermGenGen |
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357 // derives from OneContigSpaceCardGeneration which is supposed to have a |
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358 // single space, and does not override its object_iterate() method, |
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359 // object iteration via that interface does not look at the objects in |
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360 // the shared spaces when using CDS. This should be fixed; see CR 6897798. |
0 | 361 void CompactingPermGenGen::space_iterate(SpaceClosure* blk, bool usedOnly) { |
362 OneContigSpaceCardGeneration::space_iterate(blk, usedOnly); | |
363 if (spec()->enable_shared_spaces()) { | |
364 // Making the rw_space walkable will page in the entire space, and | |
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365 // is to be avoided in the case of time-critical operations. |
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366 // However, this is required for Verify and heap dump operations. |
0 | 367 blk->do_space(ro_space()); |
368 blk->do_space(rw_space()); | |
369 } | |
370 } | |
371 | |
372 | |
373 void CompactingPermGenGen::print_on(outputStream* st) const { | |
374 OneContigSpaceCardGeneration::print_on(st); | |
375 if (spec()->enable_shared_spaces()) { | |
376 st->print(" ro"); | |
377 ro_space()->print_on(st); | |
378 st->print(" rw"); | |
379 rw_space()->print_on(st); | |
380 } else { | |
381 st->print_cr("No shared spaces configured."); | |
382 } | |
383 } | |
384 | |
385 | |
386 // References from the perm gen to the younger generation objects may | |
387 // occur in static fields in Java classes or in constant pool references | |
388 // to String objects. | |
389 | |
390 void CompactingPermGenGen::younger_refs_iterate(OopsInGenClosure* blk) { | |
391 OneContigSpaceCardGeneration::younger_refs_iterate(blk); | |
392 if (spec()->enable_shared_spaces()) { | |
393 blk->set_generation(this); | |
394 // ro_space has no younger gen refs. | |
395 _rs->younger_refs_in_space_iterate(rw_space(), blk); | |
396 blk->reset_generation(); | |
397 } | |
398 } | |
399 | |
400 | |
401 // Shared spaces are addressed in pre_adjust_pointers. | |
402 void CompactingPermGenGen::adjust_pointers() { | |
403 the_space()->adjust_pointers(); | |
404 } | |
405 | |
406 | |
407 void CompactingPermGenGen::compact() { | |
408 the_space()->compact(); | |
409 } | |
410 | |
411 | |
412 size_t CompactingPermGenGen::contiguous_available() const { | |
413 // Don't include shared spaces. | |
414 return OneContigSpaceCardGeneration::contiguous_available() | |
415 - _shared_space_size; | |
416 } | |
417 | |
418 size_t CompactingPermGenGen::max_capacity() const { | |
419 // Don't include shared spaces. | |
420 assert(UseSharedSpaces || (_shared_space_size == 0), | |
421 "If not used, the size of shared spaces should be 0"); | |
422 return OneContigSpaceCardGeneration::max_capacity() | |
423 - _shared_space_size; | |
424 } | |
425 | |
426 | |
427 // No young generation references, clear this generation's main space's | |
428 // card table entries. Do NOT clear the card table entries for the | |
429 // read-only space (always clear) or the read-write space (valuable | |
430 // information). | |
431 | |
432 void CompactingPermGenGen::clear_remembered_set() { | |
433 _rs->clear(MemRegion(the_space()->bottom(), the_space()->end())); | |
434 } | |
435 | |
436 | |
437 // Objects in this generation's main space may have moved, invalidate | |
438 // that space's cards. Do NOT invalidate the card table entries for the | |
439 // read-only or read-write spaces, as those objects never move. | |
440 | |
441 void CompactingPermGenGen::invalidate_remembered_set() { | |
442 _rs->invalidate(used_region()); | |
443 } | |
444 | |
445 | |
446 void CompactingPermGenGen::verify(bool allow_dirty) { | |
447 the_space()->verify(allow_dirty); | |
448 if (!SharedSkipVerify && spec()->enable_shared_spaces()) { | |
449 ro_space()->verify(allow_dirty); | |
450 rw_space()->verify(allow_dirty); | |
451 } | |
452 } | |
453 | |
454 | |
455 HeapWord* CompactingPermGenGen::unshared_bottom; | |
456 HeapWord* CompactingPermGenGen::unshared_end; | |
457 HeapWord* CompactingPermGenGen::shared_bottom; | |
458 HeapWord* CompactingPermGenGen::shared_end; | |
459 HeapWord* CompactingPermGenGen::readonly_bottom; | |
460 HeapWord* CompactingPermGenGen::readonly_end; | |
461 HeapWord* CompactingPermGenGen::readwrite_bottom; | |
462 HeapWord* CompactingPermGenGen::readwrite_end; | |
463 HeapWord* CompactingPermGenGen::miscdata_bottom; | |
464 HeapWord* CompactingPermGenGen::miscdata_end; | |
465 HeapWord* CompactingPermGenGen::misccode_bottom; | |
466 HeapWord* CompactingPermGenGen::misccode_end; | |
467 | |
468 // JVM/TI RedefineClasses() support: | |
469 bool CompactingPermGenGen::remap_shared_readonly_as_readwrite() { | |
470 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
471 | |
472 if (UseSharedSpaces) { | |
473 // remap the shared readonly space to shared readwrite, private | |
474 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
475 if (!mapinfo->remap_shared_readonly_as_readwrite()) { | |
476 return false; | |
477 } | |
478 } | |
479 return true; | |
480 } |