Mercurial > hg > truffle
annotate src/share/vm/memory/compactingPermGenGen.cpp @ 271:818a18cd69a8
6730514: assertion failure in mangling code when expanding by 0 bytes
Summary: An expansion by 0 bytes was not anticipated when the assertion was composed.
Reviewed-by: jjh, jcoomes, apetrusenko
| author | jmasa |
|---|---|
| date | Wed, 30 Jul 2008 11:54:00 -0700 |
| parents | d1605aabd0a1 |
| children | 5251a9cd8eb8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 2003-2008 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 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_compactingPermGenGen.cpp.incl" | |
| 27 | |
| 28 | |
|
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29 // An ObjectClosure helper: Recursively adjust all pointers in an object |
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30 // and all objects by referenced it. Clear marks on objects in order to |
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31 // prevent visiting any object twice. This helper is used when the |
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32 // RedefineClasses() API has been called. |
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33 |
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34 class AdjustSharedObjectClosure : public ObjectClosure { |
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35 public: |
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36 void do_object(oop obj) { |
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37 if (obj->is_shared_readwrite()) { |
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38 if (obj->mark()->is_marked()) { |
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39 obj->init_mark(); // Don't revisit this object. |
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40 obj->adjust_pointers(); // Adjust this object's references. |
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41 } |
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42 } |
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43 } |
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44 }; |
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45 |
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46 |
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47 // An OopClosure helper: Recursively adjust all pointers in an object |
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48 // and all objects by referenced it. Clear marks on objects in order |
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49 // to prevent visiting any object twice. |
| 0 | 50 |
| 51 class RecursiveAdjustSharedObjectClosure : public OopClosure { | |
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52 protected: |
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53 template <class T> inline void do_oop_work(T* p) { |
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54 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| 0 | 55 if (obj->is_shared_readwrite()) { |
| 56 if (obj->mark()->is_marked()) { | |
| 57 obj->init_mark(); // Don't revisit this object. | |
| 58 obj->oop_iterate(this); // Recurse - adjust objects referenced. | |
| 59 obj->adjust_pointers(); // Adjust this object's references. | |
| 60 | |
| 61 // Special case: if a class has a read-only constant pool, | |
| 62 // then the read-write objects referenced by the pool must | |
| 63 // have their marks reset. | |
| 64 | |
| 65 if (obj->klass() == Universe::instanceKlassKlassObj()) { | |
| 66 instanceKlass* ik = instanceKlass::cast((klassOop)obj); | |
| 67 constantPoolOop cp = ik->constants(); | |
| 68 if (cp->is_shared_readonly()) { | |
| 69 cp->oop_iterate(this); | |
| 70 } | |
| 71 } | |
| 72 } | |
| 73 } | |
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74 } |
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75 public: |
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76 virtual void do_oop(oop* p) { RecursiveAdjustSharedObjectClosure::do_oop_work(p); } |
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77 virtual void do_oop(narrowOop* p) { RecursiveAdjustSharedObjectClosure::do_oop_work(p); } |
| 0 | 78 }; |
| 79 | |
| 80 | |
| 81 // We need to go through all placeholders in the system dictionary and | |
| 82 // try to resolve them into shared classes. Other threads might be in | |
| 83 // the process of loading a shared class and have strong roots on | |
| 84 // their stack to the class without having added the class to the | |
| 85 // dictionary yet. This means the class will be marked during phase 1 | |
| 86 // but will not be unmarked during the application of the | |
| 87 // RecursiveAdjustSharedObjectClosure to the SystemDictionary. Note | |
| 88 // that we must not call find_shared_class with non-read-only symbols | |
| 89 // as doing so can cause hash codes to be computed, destroying | |
| 90 // forwarding pointers. | |
| 91 class TraversePlaceholdersClosure : public OopClosure { | |
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92 protected: |
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93 template <class T> inline void do_oop_work(T* p) { |
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94 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
| 0 | 95 if (obj->klass() == Universe::symbolKlassObj() && |
| 96 obj->is_shared_readonly()) { | |
| 97 symbolHandle sym((symbolOop) obj); | |
| 98 oop k = SystemDictionary::find_shared_class(sym); | |
| 99 if (k != NULL) { | |
| 100 RecursiveAdjustSharedObjectClosure clo; | |
| 101 clo.do_oop(&k); | |
| 102 } | |
| 103 } | |
| 104 } | |
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105 public: |
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106 virtual void do_oop(oop* p) { TraversePlaceholdersClosure::do_oop_work(p); } |
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107 virtual void do_oop(narrowOop* p) { TraversePlaceholdersClosure::do_oop_work(p); } |
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108 |
| 0 | 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 TraversePlaceholdersClosure tpc; |
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328 SystemDictionary::placeholders_do(&tpc); |
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329 } |
| 0 | 330 } |
| 331 } | |
| 332 | |
| 333 | |
| 334 #ifdef ASSERT | |
| 335 class VerifyMarksClearedClosure : public ObjectClosure { | |
| 336 public: | |
| 337 void do_object(oop obj) { | |
| 338 assert(SharedSkipVerify || !obj->mark()->is_marked(), | |
| 339 "Shared oop still marked?"); | |
| 340 } | |
| 341 }; | |
| 342 #endif | |
| 343 | |
| 344 | |
| 345 void CompactingPermGenGen::post_compact() { | |
| 346 #ifdef ASSERT | |
| 347 if (!SharedSkipVerify && spec()->enable_shared_spaces()) { | |
| 348 VerifyMarksClearedClosure blk; | |
| 349 rw_space()->object_iterate(&blk); | |
| 350 } | |
| 351 #endif | |
| 352 } | |
| 353 | |
| 354 | |
| 355 void CompactingPermGenGen::space_iterate(SpaceClosure* blk, bool usedOnly) { | |
| 356 OneContigSpaceCardGeneration::space_iterate(blk, usedOnly); | |
| 357 if (spec()->enable_shared_spaces()) { | |
| 358 #ifdef PRODUCT | |
| 359 // Making the rw_space walkable will page in the entire space, and | |
| 360 // is to be avoided. However, this is required for Verify options. | |
| 361 ShouldNotReachHere(); | |
| 362 #endif | |
| 363 | |
| 364 blk->do_space(ro_space()); | |
| 365 blk->do_space(rw_space()); | |
| 366 } | |
| 367 } | |
| 368 | |
| 369 | |
| 370 void CompactingPermGenGen::print_on(outputStream* st) const { | |
| 371 OneContigSpaceCardGeneration::print_on(st); | |
| 372 if (spec()->enable_shared_spaces()) { | |
| 373 st->print(" ro"); | |
| 374 ro_space()->print_on(st); | |
| 375 st->print(" rw"); | |
| 376 rw_space()->print_on(st); | |
| 377 } else { | |
| 378 st->print_cr("No shared spaces configured."); | |
| 379 } | |
| 380 } | |
| 381 | |
| 382 | |
| 383 // References from the perm gen to the younger generation objects may | |
| 384 // occur in static fields in Java classes or in constant pool references | |
| 385 // to String objects. | |
| 386 | |
| 387 void CompactingPermGenGen::younger_refs_iterate(OopsInGenClosure* blk) { | |
| 388 OneContigSpaceCardGeneration::younger_refs_iterate(blk); | |
| 389 if (spec()->enable_shared_spaces()) { | |
| 390 blk->set_generation(this); | |
| 391 // ro_space has no younger gen refs. | |
| 392 _rs->younger_refs_in_space_iterate(rw_space(), blk); | |
| 393 blk->reset_generation(); | |
| 394 } | |
| 395 } | |
| 396 | |
| 397 | |
| 398 // Shared spaces are addressed in pre_adjust_pointers. | |
| 399 void CompactingPermGenGen::adjust_pointers() { | |
| 400 the_space()->adjust_pointers(); | |
| 401 } | |
| 402 | |
| 403 | |
| 404 void CompactingPermGenGen::compact() { | |
| 405 the_space()->compact(); | |
| 406 } | |
| 407 | |
| 408 | |
| 409 size_t CompactingPermGenGen::contiguous_available() const { | |
| 410 // Don't include shared spaces. | |
| 411 return OneContigSpaceCardGeneration::contiguous_available() | |
| 412 - _shared_space_size; | |
| 413 } | |
| 414 | |
| 415 size_t CompactingPermGenGen::max_capacity() const { | |
| 416 // Don't include shared spaces. | |
| 417 assert(UseSharedSpaces || (_shared_space_size == 0), | |
| 418 "If not used, the size of shared spaces should be 0"); | |
| 419 return OneContigSpaceCardGeneration::max_capacity() | |
| 420 - _shared_space_size; | |
| 421 } | |
| 422 | |
| 423 | |
| 424 | |
| 425 bool CompactingPermGenGen::grow_by(size_t bytes) { | |
| 426 // Don't allow _virtual_size to expand into shared spaces. | |
| 427 size_t max_bytes = _virtual_space.uncommitted_size() - _shared_space_size; | |
| 428 if (bytes > _shared_space_size) { | |
| 429 bytes = _shared_space_size; | |
| 430 } | |
| 431 return OneContigSpaceCardGeneration::grow_by(bytes); | |
| 432 } | |
| 433 | |
| 434 | |
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435 bool CompactingPermGenGen::grow_to_reserved() { |
| 0 | 436 // Don't allow _virtual_size to expand into shared spaces. |
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437 bool success = false; |
| 0 | 438 if (_virtual_space.uncommitted_size() > _shared_space_size) { |
| 439 size_t remaining_bytes = | |
| 440 _virtual_space.uncommitted_size() - _shared_space_size; | |
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441 success = OneContigSpaceCardGeneration::grow_by(remaining_bytes); |
| 0 | 442 DEBUG_ONLY(if (!success) warning("grow to reserved failed");) |
| 443 } | |
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444 return success; |
| 0 | 445 } |
| 446 | |
| 447 | |
| 448 // No young generation references, clear this generation's main space's | |
| 449 // card table entries. Do NOT clear the card table entries for the | |
| 450 // read-only space (always clear) or the read-write space (valuable | |
| 451 // information). | |
| 452 | |
| 453 void CompactingPermGenGen::clear_remembered_set() { | |
| 454 _rs->clear(MemRegion(the_space()->bottom(), the_space()->end())); | |
| 455 } | |
| 456 | |
| 457 | |
| 458 // Objects in this generation's main space may have moved, invalidate | |
| 459 // that space's cards. Do NOT invalidate the card table entries for the | |
| 460 // read-only or read-write spaces, as those objects never move. | |
| 461 | |
| 462 void CompactingPermGenGen::invalidate_remembered_set() { | |
| 463 _rs->invalidate(used_region()); | |
| 464 } | |
| 465 | |
| 466 | |
| 467 void CompactingPermGenGen::verify(bool allow_dirty) { | |
| 468 the_space()->verify(allow_dirty); | |
| 469 if (!SharedSkipVerify && spec()->enable_shared_spaces()) { | |
| 470 ro_space()->verify(allow_dirty); | |
| 471 rw_space()->verify(allow_dirty); | |
| 472 } | |
| 473 } | |
| 474 | |
| 475 | |
| 476 HeapWord* CompactingPermGenGen::unshared_bottom; | |
| 477 HeapWord* CompactingPermGenGen::unshared_end; | |
| 478 HeapWord* CompactingPermGenGen::shared_bottom; | |
| 479 HeapWord* CompactingPermGenGen::shared_end; | |
| 480 HeapWord* CompactingPermGenGen::readonly_bottom; | |
| 481 HeapWord* CompactingPermGenGen::readonly_end; | |
| 482 HeapWord* CompactingPermGenGen::readwrite_bottom; | |
| 483 HeapWord* CompactingPermGenGen::readwrite_end; | |
| 484 HeapWord* CompactingPermGenGen::miscdata_bottom; | |
| 485 HeapWord* CompactingPermGenGen::miscdata_end; | |
| 486 HeapWord* CompactingPermGenGen::misccode_bottom; | |
| 487 HeapWord* CompactingPermGenGen::misccode_end; | |
| 488 | |
| 489 // JVM/TI RedefineClasses() support: | |
| 490 bool CompactingPermGenGen::remap_shared_readonly_as_readwrite() { | |
| 491 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); | |
| 492 | |
| 493 if (UseSharedSpaces) { | |
| 494 // remap the shared readonly space to shared readwrite, private | |
| 495 FileMapInfo* mapinfo = FileMapInfo::current_info(); | |
| 496 if (!mapinfo->remap_shared_readonly_as_readwrite()) { | |
| 497 return false; | |
| 498 } | |
| 499 } | |
| 500 return true; | |
| 501 } | |
| 502 | |
| 503 void** CompactingPermGenGen::_vtbl_list; |