Mon, 09 Jun 2008 11:51:19 -0400
6687581: Make CMS work with compressed oops
Summary: Make FreeChunk read markword instead of LSB in _klass pointer to indicate that it's a FreeChunk for compressed oops.
Reviewed-by: ysr, jmasa
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_instanceRefKlass.cpp.incl" |
duke@435 | 27 | |
coleenp@548 | 28 | template <class T> |
coleenp@548 | 29 | static void specialized_oop_follow_contents(instanceRefKlass* ref, oop obj) { |
coleenp@548 | 30 | T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
coleenp@548 | 31 | oop referent = oopDesc::load_decode_heap_oop(referent_addr); |
duke@435 | 32 | debug_only( |
duke@435 | 33 | if(TraceReferenceGC && PrintGCDetails) { |
coleenp@548 | 34 | gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj); |
duke@435 | 35 | } |
duke@435 | 36 | ) |
duke@435 | 37 | if (referent != NULL) { |
duke@435 | 38 | if (!referent->is_gc_marked() && |
duke@435 | 39 | MarkSweep::ref_processor()-> |
coleenp@548 | 40 | discover_reference(obj, ref->reference_type())) { |
duke@435 | 41 | // reference already enqueued, referent will be traversed later |
coleenp@548 | 42 | ref->instanceKlass::oop_follow_contents(obj); |
duke@435 | 43 | debug_only( |
duke@435 | 44 | if(TraceReferenceGC && PrintGCDetails) { |
coleenp@548 | 45 | gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, obj); |
duke@435 | 46 | } |
duke@435 | 47 | ) |
duke@435 | 48 | return; |
duke@435 | 49 | } else { |
duke@435 | 50 | // treat referent as normal oop |
duke@435 | 51 | debug_only( |
duke@435 | 52 | if(TraceReferenceGC && PrintGCDetails) { |
coleenp@548 | 53 | gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, obj); |
duke@435 | 54 | } |
duke@435 | 55 | ) |
duke@435 | 56 | MarkSweep::mark_and_push(referent_addr); |
duke@435 | 57 | } |
duke@435 | 58 | } |
duke@435 | 59 | // treat next as normal oop. next is a link in the pending list. |
coleenp@548 | 60 | T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
duke@435 | 61 | debug_only( |
duke@435 | 62 | if(TraceReferenceGC && PrintGCDetails) { |
duke@435 | 63 | gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr); |
duke@435 | 64 | } |
duke@435 | 65 | ) |
duke@435 | 66 | MarkSweep::mark_and_push(next_addr); |
coleenp@548 | 67 | ref->instanceKlass::oop_follow_contents(obj); |
coleenp@548 | 68 | } |
coleenp@548 | 69 | |
coleenp@548 | 70 | void instanceRefKlass::oop_follow_contents(oop obj) { |
coleenp@548 | 71 | if (UseCompressedOops) { |
coleenp@548 | 72 | specialized_oop_follow_contents<narrowOop>(this, obj); |
coleenp@548 | 73 | } else { |
coleenp@548 | 74 | specialized_oop_follow_contents<oop>(this, obj); |
coleenp@548 | 75 | } |
duke@435 | 76 | } |
duke@435 | 77 | |
duke@435 | 78 | #ifndef SERIALGC |
coleenp@548 | 79 | template <class T> |
coleenp@548 | 80 | static void specialized_oop_follow_contents(instanceRefKlass* ref, |
coleenp@548 | 81 | ParCompactionManager* cm, |
coleenp@548 | 82 | oop obj) { |
coleenp@548 | 83 | T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
coleenp@548 | 84 | oop referent = oopDesc::load_decode_heap_oop(referent_addr); |
duke@435 | 85 | debug_only( |
duke@435 | 86 | if(TraceReferenceGC && PrintGCDetails) { |
coleenp@548 | 87 | gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj); |
duke@435 | 88 | } |
duke@435 | 89 | ) |
duke@435 | 90 | if (referent != NULL) { |
duke@435 | 91 | if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) && |
duke@435 | 92 | PSParallelCompact::ref_processor()-> |
coleenp@548 | 93 | discover_reference(obj, ref->reference_type())) { |
duke@435 | 94 | // reference already enqueued, referent will be traversed later |
coleenp@548 | 95 | ref->instanceKlass::oop_follow_contents(cm, obj); |
duke@435 | 96 | debug_only( |
duke@435 | 97 | if(TraceReferenceGC && PrintGCDetails) { |
coleenp@548 | 98 | gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, obj); |
duke@435 | 99 | } |
duke@435 | 100 | ) |
duke@435 | 101 | return; |
duke@435 | 102 | } else { |
duke@435 | 103 | // treat referent as normal oop |
duke@435 | 104 | debug_only( |
duke@435 | 105 | if(TraceReferenceGC && PrintGCDetails) { |
coleenp@548 | 106 | gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, obj); |
duke@435 | 107 | } |
duke@435 | 108 | ) |
duke@435 | 109 | PSParallelCompact::mark_and_push(cm, referent_addr); |
duke@435 | 110 | } |
duke@435 | 111 | } |
duke@435 | 112 | // treat next as normal oop. next is a link in the pending list. |
coleenp@548 | 113 | T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
duke@435 | 114 | debug_only( |
duke@435 | 115 | if(TraceReferenceGC && PrintGCDetails) { |
duke@435 | 116 | gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr); |
duke@435 | 117 | } |
duke@435 | 118 | ) |
duke@435 | 119 | PSParallelCompact::mark_and_push(cm, next_addr); |
coleenp@548 | 120 | ref->instanceKlass::oop_follow_contents(cm, obj); |
coleenp@548 | 121 | } |
coleenp@548 | 122 | |
coleenp@548 | 123 | void instanceRefKlass::oop_follow_contents(ParCompactionManager* cm, |
coleenp@548 | 124 | oop obj) { |
coleenp@548 | 125 | if (UseCompressedOops) { |
coleenp@548 | 126 | specialized_oop_follow_contents<narrowOop>(this, cm, obj); |
coleenp@548 | 127 | } else { |
coleenp@548 | 128 | specialized_oop_follow_contents<oop>(this, cm, obj); |
coleenp@548 | 129 | } |
duke@435 | 130 | } |
duke@435 | 131 | #endif // SERIALGC |
duke@435 | 132 | |
coleenp@548 | 133 | #ifdef ASSERT |
coleenp@548 | 134 | template <class T> void trace_reference_gc(const char *s, oop obj, |
coleenp@548 | 135 | T* referent_addr, |
coleenp@548 | 136 | T* next_addr, |
coleenp@548 | 137 | T* discovered_addr) { |
coleenp@548 | 138 | if(TraceReferenceGC && PrintGCDetails) { |
coleenp@548 | 139 | gclog_or_tty->print_cr("%s obj " INTPTR_FORMAT, s, (address)obj); |
coleenp@548 | 140 | gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / " |
coleenp@548 | 141 | INTPTR_FORMAT, referent_addr, |
coleenp@548 | 142 | referent_addr ? |
coleenp@548 | 143 | (address)oopDesc::load_decode_heap_oop(referent_addr) : NULL); |
coleenp@548 | 144 | gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / " |
coleenp@548 | 145 | INTPTR_FORMAT, next_addr, |
coleenp@548 | 146 | next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL); |
coleenp@548 | 147 | gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / " |
coleenp@548 | 148 | INTPTR_FORMAT, discovered_addr, |
coleenp@548 | 149 | discovered_addr ? |
coleenp@548 | 150 | (address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL); |
coleenp@548 | 151 | } |
coleenp@548 | 152 | } |
coleenp@548 | 153 | #endif |
coleenp@548 | 154 | |
coleenp@548 | 155 | template <class T> void specialized_oop_adjust_pointers(instanceRefKlass *ref, oop obj) { |
coleenp@548 | 156 | T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
coleenp@548 | 157 | MarkSweep::adjust_pointer(referent_addr); |
coleenp@548 | 158 | T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
coleenp@548 | 159 | MarkSweep::adjust_pointer(next_addr); |
coleenp@548 | 160 | T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
coleenp@548 | 161 | MarkSweep::adjust_pointer(discovered_addr); |
coleenp@548 | 162 | debug_only(trace_reference_gc("instanceRefKlass::oop_adjust_pointers", obj, |
coleenp@548 | 163 | referent_addr, next_addr, discovered_addr);) |
coleenp@548 | 164 | } |
duke@435 | 165 | |
duke@435 | 166 | int instanceRefKlass::oop_adjust_pointers(oop obj) { |
duke@435 | 167 | int size = size_helper(); |
duke@435 | 168 | instanceKlass::oop_adjust_pointers(obj); |
duke@435 | 169 | |
coleenp@548 | 170 | if (UseCompressedOops) { |
coleenp@548 | 171 | specialized_oop_adjust_pointers<narrowOop>(this, obj); |
coleenp@548 | 172 | } else { |
coleenp@548 | 173 | specialized_oop_adjust_pointers<oop>(this, obj); |
duke@435 | 174 | } |
duke@435 | 175 | return size; |
duke@435 | 176 | } |
duke@435 | 177 | |
coleenp@548 | 178 | #define InstanceRefKlass_SPECIALIZED_OOP_ITERATE(T, nv_suffix, contains) \ |
coleenp@548 | 179 | T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \ |
coleenp@548 | 180 | oop referent = oopDesc::load_decode_heap_oop(referent_addr); \ |
coleenp@548 | 181 | if (referent != NULL && contains(referent_addr)) { \ |
coleenp@548 | 182 | ReferenceProcessor* rp = closure->_ref_processor; \ |
coleenp@548 | 183 | if (!referent->is_gc_marked() && (rp != NULL) && \ |
coleenp@548 | 184 | rp->discover_reference(obj, reference_type())) { \ |
coleenp@548 | 185 | return size; \ |
coleenp@548 | 186 | } else { \ |
coleenp@548 | 187 | /* treat referent as normal oop */ \ |
coleenp@548 | 188 | SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
coleenp@548 | 189 | closure->do_oop##nv_suffix(referent_addr); \ |
coleenp@548 | 190 | } \ |
coleenp@548 | 191 | } \ |
coleenp@548 | 192 | /* treat next as normal oop */ \ |
coleenp@548 | 193 | T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \ |
coleenp@548 | 194 | if (contains(next_addr)) { \ |
coleenp@548 | 195 | SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \ |
coleenp@548 | 196 | closure->do_oop##nv_suffix(next_addr); \ |
coleenp@548 | 197 | } \ |
coleenp@548 | 198 | return size; \ |
coleenp@548 | 199 | |
coleenp@548 | 200 | |
coleenp@548 | 201 | template <class T> bool contains(T *t) { return true; } |
coleenp@548 | 202 | |
coleenp@548 | 203 | // Macro to define instanceRefKlass::oop_oop_iterate for virtual/nonvirtual for |
coleenp@548 | 204 | // all closures. Macros calling macros above for each oop size. |
coleenp@548 | 205 | |
duke@435 | 206 | #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
duke@435 | 207 | \ |
duke@435 | 208 | int instanceRefKlass:: \ |
duke@435 | 209 | oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \ |
duke@435 | 210 | /* Get size before changing pointers */ \ |
duke@435 | 211 | SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ |
duke@435 | 212 | \ |
duke@435 | 213 | int size = instanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \ |
duke@435 | 214 | \ |
coleenp@548 | 215 | if (UseCompressedOops) { \ |
coleenp@548 | 216 | InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \ |
coleenp@548 | 217 | } else { \ |
coleenp@548 | 218 | InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \ |
duke@435 | 219 | } \ |
duke@435 | 220 | } |
duke@435 | 221 | |
duke@435 | 222 | #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ |
duke@435 | 223 | \ |
duke@435 | 224 | int instanceRefKlass:: \ |
duke@435 | 225 | oop_oop_iterate##nv_suffix##_m(oop obj, \ |
duke@435 | 226 | OopClosureType* closure, \ |
duke@435 | 227 | MemRegion mr) { \ |
duke@435 | 228 | SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ |
duke@435 | 229 | \ |
duke@435 | 230 | int size = instanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \ |
coleenp@548 | 231 | if (UseCompressedOops) { \ |
coleenp@548 | 232 | InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr.contains); \ |
coleenp@548 | 233 | } else { \ |
coleenp@548 | 234 | InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr.contains); \ |
duke@435 | 235 | } \ |
duke@435 | 236 | } |
duke@435 | 237 | |
duke@435 | 238 | ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) |
duke@435 | 239 | ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) |
duke@435 | 240 | ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
duke@435 | 241 | ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
duke@435 | 242 | |
duke@435 | 243 | #ifndef SERIALGC |
coleenp@548 | 244 | template <class T> |
coleenp@548 | 245 | void specialized_oop_copy_contents(instanceRefKlass *ref, |
coleenp@548 | 246 | PSPromotionManager* pm, oop obj) { |
duke@435 | 247 | assert(!pm->depth_first(), "invariant"); |
coleenp@548 | 248 | T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
coleenp@548 | 249 | if (PSScavenge::should_scavenge(referent_addr)) { |
duke@435 | 250 | ReferenceProcessor* rp = PSScavenge::reference_processor(); |
coleenp@548 | 251 | if (rp->discover_reference(obj, ref->reference_type())) { |
duke@435 | 252 | // reference already enqueued, referent and next will be traversed later |
coleenp@548 | 253 | ref->instanceKlass::oop_copy_contents(pm, obj); |
duke@435 | 254 | return; |
duke@435 | 255 | } else { |
duke@435 | 256 | // treat referent as normal oop |
duke@435 | 257 | pm->claim_or_forward_breadth(referent_addr); |
duke@435 | 258 | } |
duke@435 | 259 | } |
duke@435 | 260 | // treat next as normal oop |
coleenp@548 | 261 | T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
coleenp@548 | 262 | if (PSScavenge::should_scavenge(next_addr)) { |
duke@435 | 263 | pm->claim_or_forward_breadth(next_addr); |
duke@435 | 264 | } |
coleenp@548 | 265 | ref->instanceKlass::oop_copy_contents(pm, obj); |
duke@435 | 266 | } |
duke@435 | 267 | |
coleenp@548 | 268 | void instanceRefKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) { |
coleenp@548 | 269 | if (UseCompressedOops) { |
coleenp@548 | 270 | specialized_oop_copy_contents<narrowOop>(this, pm, obj); |
coleenp@548 | 271 | } else { |
coleenp@548 | 272 | specialized_oop_copy_contents<oop>(this, pm, obj); |
coleenp@548 | 273 | } |
coleenp@548 | 274 | } |
coleenp@548 | 275 | |
coleenp@548 | 276 | template <class T> |
coleenp@548 | 277 | void specialized_oop_push_contents(instanceRefKlass *ref, |
coleenp@548 | 278 | PSPromotionManager* pm, oop obj) { |
duke@435 | 279 | assert(pm->depth_first(), "invariant"); |
coleenp@548 | 280 | T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
coleenp@548 | 281 | if (PSScavenge::should_scavenge(referent_addr)) { |
duke@435 | 282 | ReferenceProcessor* rp = PSScavenge::reference_processor(); |
coleenp@548 | 283 | if (rp->discover_reference(obj, ref->reference_type())) { |
duke@435 | 284 | // reference already enqueued, referent and next will be traversed later |
coleenp@548 | 285 | ref->instanceKlass::oop_push_contents(pm, obj); |
duke@435 | 286 | return; |
duke@435 | 287 | } else { |
duke@435 | 288 | // treat referent as normal oop |
duke@435 | 289 | pm->claim_or_forward_depth(referent_addr); |
duke@435 | 290 | } |
duke@435 | 291 | } |
duke@435 | 292 | // treat next as normal oop |
coleenp@548 | 293 | T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
coleenp@548 | 294 | if (PSScavenge::should_scavenge(next_addr)) { |
duke@435 | 295 | pm->claim_or_forward_depth(next_addr); |
duke@435 | 296 | } |
coleenp@548 | 297 | ref->instanceKlass::oop_push_contents(pm, obj); |
coleenp@548 | 298 | } |
coleenp@548 | 299 | |
coleenp@548 | 300 | void instanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { |
coleenp@548 | 301 | if (UseCompressedOops) { |
coleenp@548 | 302 | specialized_oop_push_contents<narrowOop>(this, pm, obj); |
coleenp@548 | 303 | } else { |
coleenp@548 | 304 | specialized_oop_push_contents<oop>(this, pm, obj); |
coleenp@548 | 305 | } |
coleenp@548 | 306 | } |
coleenp@548 | 307 | |
coleenp@548 | 308 | template <class T> |
coleenp@548 | 309 | void specialized_oop_update_pointers(instanceRefKlass *ref, |
coleenp@548 | 310 | ParCompactionManager* cm, oop obj) { |
coleenp@548 | 311 | T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
coleenp@548 | 312 | PSParallelCompact::adjust_pointer(referent_addr); |
coleenp@548 | 313 | T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
coleenp@548 | 314 | PSParallelCompact::adjust_pointer(next_addr); |
coleenp@548 | 315 | T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
coleenp@548 | 316 | PSParallelCompact::adjust_pointer(discovered_addr); |
coleenp@548 | 317 | debug_only(trace_reference_gc("instanceRefKlass::oop_update_ptrs", obj, |
coleenp@548 | 318 | referent_addr, next_addr, discovered_addr);) |
duke@435 | 319 | } |
duke@435 | 320 | |
duke@435 | 321 | int instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { |
duke@435 | 322 | instanceKlass::oop_update_pointers(cm, obj); |
coleenp@548 | 323 | if (UseCompressedOops) { |
coleenp@548 | 324 | specialized_oop_update_pointers<narrowOop>(this, cm, obj); |
coleenp@548 | 325 | } else { |
coleenp@548 | 326 | specialized_oop_update_pointers<oop>(this, cm, obj); |
coleenp@548 | 327 | } |
coleenp@548 | 328 | return size_helper(); |
coleenp@548 | 329 | } |
duke@435 | 330 | |
duke@435 | 331 | |
coleenp@548 | 332 | template <class T> void |
coleenp@548 | 333 | specialized_oop_update_pointers(ParCompactionManager* cm, oop obj, |
coleenp@548 | 334 | HeapWord* beg_addr, HeapWord* end_addr) { |
coleenp@548 | 335 | T* p; |
coleenp@548 | 336 | T* referent_addr = p = (T*)java_lang_ref_Reference::referent_addr(obj); |
coleenp@548 | 337 | PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); |
coleenp@548 | 338 | T* next_addr = p = (T*)java_lang_ref_Reference::next_addr(obj); |
coleenp@548 | 339 | PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); |
coleenp@548 | 340 | T* discovered_addr = p = (T*)java_lang_ref_Reference::discovered_addr(obj); |
coleenp@548 | 341 | PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); |
coleenp@548 | 342 | debug_only(trace_reference_gc("instanceRefKlass::oop_update_ptrs", obj, |
coleenp@548 | 343 | referent_addr, next_addr, discovered_addr);) |
duke@435 | 344 | } |
duke@435 | 345 | |
duke@435 | 346 | int |
duke@435 | 347 | instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj, |
duke@435 | 348 | HeapWord* beg_addr, HeapWord* end_addr) { |
duke@435 | 349 | instanceKlass::oop_update_pointers(cm, obj, beg_addr, end_addr); |
coleenp@548 | 350 | if (UseCompressedOops) { |
coleenp@548 | 351 | specialized_oop_update_pointers<narrowOop>(cm, obj, beg_addr, end_addr); |
coleenp@548 | 352 | } else { |
coleenp@548 | 353 | specialized_oop_update_pointers<oop>(cm, obj, beg_addr, end_addr); |
duke@435 | 354 | } |
duke@435 | 355 | return size_helper(); |
duke@435 | 356 | } |
duke@435 | 357 | #endif // SERIALGC |
duke@435 | 358 | |
duke@435 | 359 | void instanceRefKlass::update_nonstatic_oop_maps(klassOop k) { |
duke@435 | 360 | // Clear the nonstatic oop-map entries corresponding to referent |
duke@435 | 361 | // and nextPending field. They are treated specially by the |
duke@435 | 362 | // garbage collector. |
duke@435 | 363 | // The discovered field is used only by the garbage collector |
duke@435 | 364 | // and is also treated specially. |
duke@435 | 365 | instanceKlass* ik = instanceKlass::cast(k); |
duke@435 | 366 | |
duke@435 | 367 | // Check that we have the right class |
duke@435 | 368 | debug_only(static bool first_time = true); |
duke@435 | 369 | assert(k == SystemDictionary::reference_klass() && first_time, |
duke@435 | 370 | "Invalid update of maps"); |
duke@435 | 371 | debug_only(first_time = false); |
duke@435 | 372 | assert(ik->nonstatic_oop_map_size() == 1, "just checking"); |
duke@435 | 373 | |
duke@435 | 374 | OopMapBlock* map = ik->start_of_nonstatic_oop_maps(); |
duke@435 | 375 | |
duke@435 | 376 | // Check that the current map is (2,4) - currently points at field with |
duke@435 | 377 | // offset 2 (words) and has 4 map entries. |
duke@435 | 378 | debug_only(int offset = java_lang_ref_Reference::referent_offset); |
duke@435 | 379 | debug_only(int length = ((java_lang_ref_Reference::discovered_offset - |
coleenp@548 | 380 | java_lang_ref_Reference::referent_offset)/heapOopSize) + 1); |
duke@435 | 381 | |
duke@435 | 382 | if (UseSharedSpaces) { |
duke@435 | 383 | assert(map->offset() == java_lang_ref_Reference::queue_offset && |
duke@435 | 384 | map->length() == 1, "just checking"); |
duke@435 | 385 | } else { |
duke@435 | 386 | assert(map->offset() == offset && map->length() == length, |
duke@435 | 387 | "just checking"); |
duke@435 | 388 | |
duke@435 | 389 | // Update map to (3,1) - point to offset of 3 (words) with 1 map entry. |
duke@435 | 390 | map->set_offset(java_lang_ref_Reference::queue_offset); |
duke@435 | 391 | map->set_length(1); |
duke@435 | 392 | } |
duke@435 | 393 | } |
duke@435 | 394 | |
duke@435 | 395 | |
duke@435 | 396 | // Verification |
duke@435 | 397 | |
duke@435 | 398 | void instanceRefKlass::oop_verify_on(oop obj, outputStream* st) { |
duke@435 | 399 | instanceKlass::oop_verify_on(obj, st); |
duke@435 | 400 | // Verify referent field |
duke@435 | 401 | oop referent = java_lang_ref_Reference::referent(obj); |
duke@435 | 402 | |
duke@435 | 403 | // We should make this general to all heaps |
duke@435 | 404 | GenCollectedHeap* gch = NULL; |
duke@435 | 405 | if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap) |
duke@435 | 406 | gch = GenCollectedHeap::heap(); |
duke@435 | 407 | |
duke@435 | 408 | if (referent != NULL) { |
duke@435 | 409 | guarantee(referent->is_oop(), "referent field heap failed"); |
coleenp@548 | 410 | if (gch != NULL && !gch->is_in_youngest(obj)) { |
duke@435 | 411 | // We do a specific remembered set check here since the referent |
duke@435 | 412 | // field is not part of the oop mask and therefore skipped by the |
duke@435 | 413 | // regular verify code. |
coleenp@548 | 414 | if (UseCompressedOops) { |
coleenp@548 | 415 | narrowOop* referent_addr = (narrowOop*)java_lang_ref_Reference::referent_addr(obj); |
coleenp@548 | 416 | obj->verify_old_oop(referent_addr, true); |
coleenp@548 | 417 | } else { |
coleenp@548 | 418 | oop* referent_addr = (oop*)java_lang_ref_Reference::referent_addr(obj); |
coleenp@548 | 419 | obj->verify_old_oop(referent_addr, true); |
coleenp@548 | 420 | } |
coleenp@548 | 421 | } |
duke@435 | 422 | } |
duke@435 | 423 | // Verify next field |
duke@435 | 424 | oop next = java_lang_ref_Reference::next(obj); |
duke@435 | 425 | if (next != NULL) { |
coleenp@548 | 426 | guarantee(next->is_oop(), "next field verify fa iled"); |
duke@435 | 427 | guarantee(next->is_instanceRef(), "next field verify failed"); |
duke@435 | 428 | if (gch != NULL && !gch->is_in_youngest(obj)) { |
duke@435 | 429 | // We do a specific remembered set check here since the next field is |
duke@435 | 430 | // not part of the oop mask and therefore skipped by the regular |
duke@435 | 431 | // verify code. |
coleenp@548 | 432 | if (UseCompressedOops) { |
coleenp@548 | 433 | narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
coleenp@548 | 434 | obj->verify_old_oop(next_addr, true); |
coleenp@548 | 435 | } else { |
coleenp@548 | 436 | oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
coleenp@548 | 437 | obj->verify_old_oop(next_addr, true); |
coleenp@548 | 438 | } |
duke@435 | 439 | } |
duke@435 | 440 | } |
duke@435 | 441 | } |
duke@435 | 442 | |
duke@435 | 443 | void instanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) { |
duke@435 | 444 | // we may enter this with pending exception set |
duke@435 | 445 | PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument |
duke@435 | 446 | Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
duke@435 | 447 | ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD); |
duke@435 | 448 | assert(ObjectSynchronizer::current_thread_holds_lock( |
duke@435 | 449 | JavaThread::current(), h_lock), |
duke@435 | 450 | "Locking should have succeeded"); |
duke@435 | 451 | if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; |
duke@435 | 452 | } |
duke@435 | 453 | |
duke@435 | 454 | void instanceRefKlass::release_and_notify_pending_list_lock( |
duke@435 | 455 | BasicLock *pending_list_basic_lock) { |
duke@435 | 456 | // we may enter this with pending exception set |
duke@435 | 457 | PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument |
duke@435 | 458 | // |
duke@435 | 459 | Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
duke@435 | 460 | assert(ObjectSynchronizer::current_thread_holds_lock( |
duke@435 | 461 | JavaThread::current(), h_lock), |
duke@435 | 462 | "Lock should be held"); |
duke@435 | 463 | // Notify waiters on pending lists lock if there is any reference. |
duke@435 | 464 | if (java_lang_ref_Reference::pending_list() != NULL) { |
duke@435 | 465 | ObjectSynchronizer::notifyall(h_lock, THREAD); |
duke@435 | 466 | } |
duke@435 | 467 | ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD); |
duke@435 | 468 | if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; |
duke@435 | 469 | } |