Mercurial > hg > graal-compiler
annotate src/share/vm/memory/compactingPermGenGen.cpp @ 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 |
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date | Tue, 23 Nov 2010 13:22:55 -0800 |
parents | c18cbe5936b8 |
children | 3582bf76420e |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 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 * | |
1552
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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 | |
98 // RecursiveAdjustSharedObjectClosure to the SystemDictionary. Note | |
99 // that we must not call find_shared_class with non-read-only symbols | |
100 // as doing so can cause hash codes to be computed, destroying | |
101 // forwarding pointers. | |
102 class TraversePlaceholdersClosure : public OopClosure { | |
113
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103 protected: |
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104 template <class T> inline void do_oop_work(T* p) { |
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105 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
0 | 106 if (obj->klass() == Universe::symbolKlassObj() && |
107 obj->is_shared_readonly()) { | |
108 symbolHandle sym((symbolOop) obj); | |
109 oop k = SystemDictionary::find_shared_class(sym); | |
110 if (k != NULL) { | |
111 RecursiveAdjustSharedObjectClosure clo; | |
112 clo.do_oop(&k); | |
113 } | |
114 } | |
115 } | |
113
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116 public: |
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117 virtual void do_oop(oop* p) { TraversePlaceholdersClosure::do_oop_work(p); } |
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118 virtual void do_oop(narrowOop* p) { TraversePlaceholdersClosure::do_oop_work(p); } |
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119 |
0 | 120 }; |
121 | |
122 | |
123 void CompactingPermGenGen::initialize_performance_counters() { | |
124 | |
125 const char* gen_name = "perm"; | |
126 | |
127 // Generation Counters - generation 2, 1 subspace | |
128 _gen_counters = new GenerationCounters(gen_name, 2, 1, &_virtual_space); | |
129 | |
130 _space_counters = new CSpaceCounters(gen_name, 0, | |
131 _virtual_space.reserved_size(), | |
132 _the_space, _gen_counters); | |
133 } | |
134 | |
135 void CompactingPermGenGen::update_counters() { | |
136 if (UsePerfData) { | |
137 _space_counters->update_all(); | |
138 _gen_counters->update_all(); | |
139 } | |
140 } | |
141 | |
142 | |
143 CompactingPermGenGen::CompactingPermGenGen(ReservedSpace rs, | |
144 ReservedSpace shared_rs, | |
145 size_t initial_byte_size, | |
146 int level, GenRemSet* remset, | |
147 ContiguousSpace* space, | |
148 PermanentGenerationSpec* spec_) : | |
149 OneContigSpaceCardGeneration(rs, initial_byte_size, MinPermHeapExpansion, | |
150 level, remset, space) { | |
151 | |
152 set_spec(spec_); | |
153 if (!UseSharedSpaces && !DumpSharedSpaces) { | |
154 spec()->disable_sharing(); | |
155 } | |
156 | |
157 // Break virtual space into address ranges for all spaces. | |
158 | |
159 if (spec()->enable_shared_spaces()) { | |
160 shared_end = (HeapWord*)(shared_rs.base() + shared_rs.size()); | |
161 misccode_end = shared_end; | |
162 misccode_bottom = misccode_end - heap_word_size(spec()->misc_code_size()); | |
163 miscdata_end = misccode_bottom; | |
164 miscdata_bottom = miscdata_end - heap_word_size(spec()->misc_data_size()); | |
165 readwrite_end = miscdata_bottom; | |
166 readwrite_bottom = | |
167 readwrite_end - heap_word_size(spec()->read_write_size()); | |
168 readonly_end = readwrite_bottom; | |
169 readonly_bottom = | |
170 readonly_end - heap_word_size(spec()->read_only_size()); | |
171 shared_bottom = readonly_bottom; | |
172 unshared_end = shared_bottom; | |
173 assert((char*)shared_bottom == shared_rs.base(), "shared space mismatch"); | |
174 } else { | |
175 shared_end = (HeapWord*)(rs.base() + rs.size()); | |
176 misccode_end = shared_end; | |
177 misccode_bottom = shared_end; | |
178 miscdata_end = shared_end; | |
179 miscdata_bottom = shared_end; | |
180 readwrite_end = shared_end; | |
181 readwrite_bottom = shared_end; | |
182 readonly_end = shared_end; | |
183 readonly_bottom = shared_end; | |
184 shared_bottom = shared_end; | |
185 unshared_end = shared_bottom; | |
186 } | |
187 unshared_bottom = (HeapWord*) rs.base(); | |
188 | |
189 // Verify shared and unshared spaces adjacent. | |
190 assert((char*)shared_bottom == rs.base()+rs.size(), "shared space mismatch"); | |
191 assert(unshared_end > unshared_bottom, "shared space mismatch"); | |
192 | |
193 // Split reserved memory into pieces. | |
194 | |
195 ReservedSpace ro_rs = shared_rs.first_part(spec()->read_only_size(), | |
196 UseSharedSpaces); | |
197 ReservedSpace tmp_rs1 = shared_rs.last_part(spec()->read_only_size()); | |
198 ReservedSpace rw_rs = tmp_rs1.first_part(spec()->read_write_size(), | |
199 UseSharedSpaces); | |
200 ReservedSpace tmp_rs2 = tmp_rs1.last_part(spec()->read_write_size()); | |
201 ReservedSpace md_rs = tmp_rs2.first_part(spec()->misc_data_size(), | |
202 UseSharedSpaces); | |
203 ReservedSpace mc_rs = tmp_rs2.last_part(spec()->misc_data_size()); | |
204 | |
205 _shared_space_size = spec()->read_only_size() | |
206 + spec()->read_write_size() | |
207 + spec()->misc_data_size() | |
208 + spec()->misc_code_size(); | |
209 | |
210 // Allocate the unshared (default) space. | |
211 _the_space = new ContigPermSpace(_bts, | |
212 MemRegion(unshared_bottom, heap_word_size(initial_byte_size))); | |
213 if (_the_space == NULL) | |
214 vm_exit_during_initialization("Could not allocate an unshared" | |
215 " CompactingPermGen Space"); | |
216 | |
217 // Allocate shared spaces | |
218 if (spec()->enable_shared_spaces()) { | |
219 | |
220 // If mapping a shared file, the space is not committed, don't | |
221 // mangle. | |
222 NOT_PRODUCT(bool old_ZapUnusedHeapArea = ZapUnusedHeapArea;) | |
223 NOT_PRODUCT(if (UseSharedSpaces) ZapUnusedHeapArea = false;) | |
224 | |
225 // Commit the memory behind the shared spaces if dumping (not | |
226 // mapping). | |
227 if (DumpSharedSpaces) { | |
228 _ro_vs.initialize(ro_rs, spec()->read_only_size()); | |
229 _rw_vs.initialize(rw_rs, spec()->read_write_size()); | |
230 _md_vs.initialize(md_rs, spec()->misc_data_size()); | |
231 _mc_vs.initialize(mc_rs, spec()->misc_code_size()); | |
232 } | |
233 | |
234 // Allocate the shared spaces. | |
235 _ro_bts = new BlockOffsetSharedArray( | |
236 MemRegion(readonly_bottom, | |
237 heap_word_size(spec()->read_only_size())), | |
238 heap_word_size(spec()->read_only_size())); | |
239 _ro_space = new OffsetTableContigSpace(_ro_bts, | |
240 MemRegion(readonly_bottom, readonly_end)); | |
241 _rw_bts = new BlockOffsetSharedArray( | |
242 MemRegion(readwrite_bottom, | |
243 heap_word_size(spec()->read_write_size())), | |
244 heap_word_size(spec()->read_write_size())); | |
245 _rw_space = new OffsetTableContigSpace(_rw_bts, | |
246 MemRegion(readwrite_bottom, readwrite_end)); | |
247 | |
248 // Restore mangling flag. | |
249 NOT_PRODUCT(ZapUnusedHeapArea = old_ZapUnusedHeapArea;) | |
250 | |
251 if (_ro_space == NULL || _rw_space == NULL) | |
252 vm_exit_during_initialization("Could not allocate a shared space"); | |
253 | |
254 // Cover both shared spaces entirely with cards. | |
255 _rs->resize_covered_region(MemRegion(readonly_bottom, readwrite_end)); | |
256 | |
257 if (UseSharedSpaces) { | |
258 | |
259 // Map in the regions in the shared file. | |
260 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
261 size_t image_alignment = mapinfo->alignment(); | |
262 CollectedHeap* ch = Universe::heap(); | |
263 if ((!mapinfo->map_space(ro, ro_rs, _ro_space)) || | |
264 (!mapinfo->map_space(rw, rw_rs, _rw_space)) || | |
265 (!mapinfo->map_space(md, md_rs, NULL)) || | |
266 (!mapinfo->map_space(mc, mc_rs, NULL)) || | |
267 // check the alignment constraints | |
268 (ch == NULL || ch->kind() != CollectedHeap::GenCollectedHeap || | |
269 image_alignment != | |
270 ((GenCollectedHeap*)ch)->gen_policy()->max_alignment())) { | |
271 // Base addresses didn't match; skip sharing, but continue | |
272 shared_rs.release(); | |
273 spec()->disable_sharing(); | |
274 // If -Xshare:on is specified, print out the error message and exit VM, | |
275 // otherwise, set UseSharedSpaces to false and continue. | |
276 if (RequireSharedSpaces) { | |
277 vm_exit_during_initialization("Unable to use shared archive.", NULL); | |
278 } else { | |
279 FLAG_SET_DEFAULT(UseSharedSpaces, false); | |
280 } | |
281 | |
282 // Note: freeing the block offset array objects does not | |
283 // currently free up the underlying storage. | |
284 delete _ro_bts; | |
285 _ro_bts = NULL; | |
286 delete _ro_space; | |
287 _ro_space = NULL; | |
288 delete _rw_bts; | |
289 _rw_bts = NULL; | |
290 delete _rw_space; | |
291 _rw_space = NULL; | |
292 shared_end = (HeapWord*)(rs.base() + rs.size()); | |
293 _rs->resize_covered_region(MemRegion(shared_bottom, shared_bottom)); | |
294 } | |
295 } | |
296 | |
297 // Reserved region includes shared spaces for oop.is_in_reserved(). | |
298 _reserved.set_end(shared_end); | |
299 | |
300 } else { | |
301 _ro_space = NULL; | |
302 _rw_space = NULL; | |
303 } | |
304 } | |
305 | |
306 | |
307 // Do a complete scan of the shared read write space to catch all | |
308 // objects which contain references to any younger generation. Forward | |
309 // the pointers. Avoid space_iterate, as actually visiting all the | |
310 // objects in the space will page in more objects than we need. | |
311 // Instead, use the system dictionary as strong roots into the read | |
312 // write space. | |
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313 // |
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314 // If a RedefineClasses() call has been made, then we have to iterate |
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315 // over the entire shared read-write space in order to find all the |
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316 // objects that need to be forwarded. For example, it is possible for |
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317 // an nmethod to be found and marked in GC phase-1 only for the nmethod |
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318 // to be freed by the time we reach GC phase-3. The underlying method |
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319 // is still marked, but we can't (easily) find it in GC phase-3 so we |
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320 // blow up in GC phase-4. With RedefineClasses() we want replaced code |
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321 // (EMCP or obsolete) to go away (i.e., be collectible) once it is no |
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322 // longer being executed by any thread so we keep minimal attachments |
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323 // to the replaced code. However, we can't guarantee when those EMCP |
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324 // or obsolete methods will be collected so they may still be out there |
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325 // even after we've severed our minimal attachments. |
0 | 326 |
327 void CompactingPermGenGen::pre_adjust_pointers() { | |
328 if (spec()->enable_shared_spaces()) { | |
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329 if (JvmtiExport::has_redefined_a_class()) { |
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330 // RedefineClasses() requires a brute force approach |
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331 AdjustSharedObjectClosure blk; |
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332 rw_space()->object_iterate(&blk); |
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333 } else { |
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334 RecursiveAdjustSharedObjectClosure blk; |
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335 Universe::oops_do(&blk); |
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336 StringTable::oops_do(&blk); |
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337 SystemDictionary::always_strong_classes_do(&blk); |
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338 TraversePlaceholdersClosure tpc; |
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339 SystemDictionary::placeholders_do(&tpc); |
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340 } |
0 | 341 } |
342 } | |
343 | |
344 | |
345 #ifdef ASSERT | |
346 class VerifyMarksClearedClosure : public ObjectClosure { | |
347 public: | |
348 void do_object(oop obj) { | |
349 assert(SharedSkipVerify || !obj->mark()->is_marked(), | |
350 "Shared oop still marked?"); | |
351 } | |
352 }; | |
353 #endif | |
354 | |
355 | |
356 void CompactingPermGenGen::post_compact() { | |
357 #ifdef ASSERT | |
358 if (!SharedSkipVerify && spec()->enable_shared_spaces()) { | |
359 VerifyMarksClearedClosure blk; | |
360 rw_space()->object_iterate(&blk); | |
361 } | |
362 #endif | |
363 } | |
364 | |
365 | |
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366 // Do not use in time-critical operations due to the possibility of paging |
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367 // in otherwise untouched or previously unread portions of the perm gen, |
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368 // for instance, the shared spaces. NOTE: Because CompactingPermGenGen |
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369 // derives from OneContigSpaceCardGeneration which is supposed to have a |
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370 // single space, and does not override its object_iterate() method, |
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371 // object iteration via that interface does not look at the objects in |
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372 // the shared spaces when using CDS. This should be fixed; see CR 6897798. |
0 | 373 void CompactingPermGenGen::space_iterate(SpaceClosure* blk, bool usedOnly) { |
374 OneContigSpaceCardGeneration::space_iterate(blk, usedOnly); | |
375 if (spec()->enable_shared_spaces()) { | |
376 // Making the rw_space walkable will page in the entire space, and | |
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377 // is to be avoided in the case of time-critical operations. |
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378 // However, this is required for Verify and heap dump operations. |
0 | 379 blk->do_space(ro_space()); |
380 blk->do_space(rw_space()); | |
381 } | |
382 } | |
383 | |
384 | |
385 void CompactingPermGenGen::print_on(outputStream* st) const { | |
386 OneContigSpaceCardGeneration::print_on(st); | |
387 if (spec()->enable_shared_spaces()) { | |
388 st->print(" ro"); | |
389 ro_space()->print_on(st); | |
390 st->print(" rw"); | |
391 rw_space()->print_on(st); | |
392 } else { | |
393 st->print_cr("No shared spaces configured."); | |
394 } | |
395 } | |
396 | |
397 | |
398 // References from the perm gen to the younger generation objects may | |
399 // occur in static fields in Java classes or in constant pool references | |
400 // to String objects. | |
401 | |
402 void CompactingPermGenGen::younger_refs_iterate(OopsInGenClosure* blk) { | |
403 OneContigSpaceCardGeneration::younger_refs_iterate(blk); | |
404 if (spec()->enable_shared_spaces()) { | |
405 blk->set_generation(this); | |
406 // ro_space has no younger gen refs. | |
407 _rs->younger_refs_in_space_iterate(rw_space(), blk); | |
408 blk->reset_generation(); | |
409 } | |
410 } | |
411 | |
412 | |
413 // Shared spaces are addressed in pre_adjust_pointers. | |
414 void CompactingPermGenGen::adjust_pointers() { | |
415 the_space()->adjust_pointers(); | |
416 } | |
417 | |
418 | |
419 void CompactingPermGenGen::compact() { | |
420 the_space()->compact(); | |
421 } | |
422 | |
423 | |
424 size_t CompactingPermGenGen::contiguous_available() const { | |
425 // Don't include shared spaces. | |
426 return OneContigSpaceCardGeneration::contiguous_available() | |
427 - _shared_space_size; | |
428 } | |
429 | |
430 size_t CompactingPermGenGen::max_capacity() const { | |
431 // Don't include shared spaces. | |
432 assert(UseSharedSpaces || (_shared_space_size == 0), | |
433 "If not used, the size of shared spaces should be 0"); | |
434 return OneContigSpaceCardGeneration::max_capacity() | |
435 - _shared_space_size; | |
436 } | |
437 | |
438 | |
439 // No young generation references, clear this generation's main space's | |
440 // card table entries. Do NOT clear the card table entries for the | |
441 // read-only space (always clear) or the read-write space (valuable | |
442 // information). | |
443 | |
444 void CompactingPermGenGen::clear_remembered_set() { | |
445 _rs->clear(MemRegion(the_space()->bottom(), the_space()->end())); | |
446 } | |
447 | |
448 | |
449 // Objects in this generation's main space may have moved, invalidate | |
450 // that space's cards. Do NOT invalidate the card table entries for the | |
451 // read-only or read-write spaces, as those objects never move. | |
452 | |
453 void CompactingPermGenGen::invalidate_remembered_set() { | |
454 _rs->invalidate(used_region()); | |
455 } | |
456 | |
457 | |
458 void CompactingPermGenGen::verify(bool allow_dirty) { | |
459 the_space()->verify(allow_dirty); | |
460 if (!SharedSkipVerify && spec()->enable_shared_spaces()) { | |
461 ro_space()->verify(allow_dirty); | |
462 rw_space()->verify(allow_dirty); | |
463 } | |
464 } | |
465 | |
466 | |
467 HeapWord* CompactingPermGenGen::unshared_bottom; | |
468 HeapWord* CompactingPermGenGen::unshared_end; | |
469 HeapWord* CompactingPermGenGen::shared_bottom; | |
470 HeapWord* CompactingPermGenGen::shared_end; | |
471 HeapWord* CompactingPermGenGen::readonly_bottom; | |
472 HeapWord* CompactingPermGenGen::readonly_end; | |
473 HeapWord* CompactingPermGenGen::readwrite_bottom; | |
474 HeapWord* CompactingPermGenGen::readwrite_end; | |
475 HeapWord* CompactingPermGenGen::miscdata_bottom; | |
476 HeapWord* CompactingPermGenGen::miscdata_end; | |
477 HeapWord* CompactingPermGenGen::misccode_bottom; | |
478 HeapWord* CompactingPermGenGen::misccode_end; | |
479 | |
480 // JVM/TI RedefineClasses() support: | |
481 bool CompactingPermGenGen::remap_shared_readonly_as_readwrite() { | |
482 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
483 | |
484 if (UseSharedSpaces) { | |
485 // remap the shared readonly space to shared readwrite, private | |
486 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
487 if (!mapinfo->remap_shared_readonly_as_readwrite()) { | |
488 return false; | |
489 } | |
490 } | |
491 return true; | |
492 } | |
493 | |
494 void** CompactingPermGenGen::_vtbl_list; |