1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/instanceRefKlass.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,417 @@
1.4 +/*
1.5 + * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +# include "incls/_precompiled.incl"
1.29 +# include "incls/_instanceRefKlass.cpp.incl"
1.30 +
1.31 +void instanceRefKlass::oop_follow_contents(oop obj) {
1.32 + oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
1.33 + oop referent = *referent_addr;
1.34 + debug_only(
1.35 + if(TraceReferenceGC && PrintGCDetails) {
1.36 + gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (address)obj);
1.37 + }
1.38 + )
1.39 + if (referent != NULL) {
1.40 + if (!referent->is_gc_marked() &&
1.41 + MarkSweep::ref_processor()->
1.42 + discover_reference(obj, reference_type())) {
1.43 + // reference already enqueued, referent will be traversed later
1.44 + instanceKlass::oop_follow_contents(obj);
1.45 + debug_only(
1.46 + if(TraceReferenceGC && PrintGCDetails) {
1.47 + gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (address)obj);
1.48 + }
1.49 + )
1.50 + return;
1.51 + } else {
1.52 + // treat referent as normal oop
1.53 + debug_only(
1.54 + if(TraceReferenceGC && PrintGCDetails) {
1.55 + gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (address)obj);
1.56 + }
1.57 + )
1.58 + MarkSweep::mark_and_push(referent_addr);
1.59 + }
1.60 + }
1.61 + // treat next as normal oop. next is a link in the pending list.
1.62 + oop* next_addr = java_lang_ref_Reference::next_addr(obj);
1.63 + debug_only(
1.64 + if(TraceReferenceGC && PrintGCDetails) {
1.65 + gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr);
1.66 + }
1.67 + )
1.68 + MarkSweep::mark_and_push(next_addr);
1.69 + instanceKlass::oop_follow_contents(obj);
1.70 +}
1.71 +
1.72 +#ifndef SERIALGC
1.73 +void instanceRefKlass::oop_follow_contents(ParCompactionManager* cm,
1.74 + oop obj) {
1.75 + oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
1.76 + oop referent = *referent_addr;
1.77 + debug_only(
1.78 + if(TraceReferenceGC && PrintGCDetails) {
1.79 + gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (address)obj);
1.80 + }
1.81 + )
1.82 + if (referent != NULL) {
1.83 + if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) &&
1.84 + PSParallelCompact::ref_processor()->
1.85 + discover_reference(obj, reference_type())) {
1.86 + // reference already enqueued, referent will be traversed later
1.87 + instanceKlass::oop_follow_contents(cm, obj);
1.88 + debug_only(
1.89 + if(TraceReferenceGC && PrintGCDetails) {
1.90 + gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (address)obj);
1.91 + }
1.92 + )
1.93 + return;
1.94 + } else {
1.95 + // treat referent as normal oop
1.96 + debug_only(
1.97 + if(TraceReferenceGC && PrintGCDetails) {
1.98 + gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (address)obj);
1.99 + }
1.100 + )
1.101 + PSParallelCompact::mark_and_push(cm, referent_addr);
1.102 + }
1.103 + }
1.104 + // treat next as normal oop. next is a link in the pending list.
1.105 + oop* next_addr = java_lang_ref_Reference::next_addr(obj);
1.106 + debug_only(
1.107 + if(TraceReferenceGC && PrintGCDetails) {
1.108 + gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr);
1.109 + }
1.110 + )
1.111 + PSParallelCompact::mark_and_push(cm, next_addr);
1.112 + instanceKlass::oop_follow_contents(cm, obj);
1.113 +}
1.114 +#endif // SERIALGC
1.115 +
1.116 +
1.117 +int instanceRefKlass::oop_adjust_pointers(oop obj) {
1.118 + int size = size_helper();
1.119 + instanceKlass::oop_adjust_pointers(obj);
1.120 +
1.121 + oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
1.122 + MarkSweep::adjust_pointer(referent_addr);
1.123 + oop* next_addr = java_lang_ref_Reference::next_addr(obj);
1.124 + MarkSweep::adjust_pointer(next_addr);
1.125 + oop* discovered_addr = java_lang_ref_Reference::discovered_addr(obj);
1.126 + MarkSweep::adjust_pointer(discovered_addr);
1.127 +
1.128 +#ifdef ASSERT
1.129 + if(TraceReferenceGC && PrintGCDetails) {
1.130 + gclog_or_tty->print_cr("instanceRefKlass::oop_adjust_pointers obj "
1.131 + INTPTR_FORMAT, (address)obj);
1.132 + gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
1.133 + INTPTR_FORMAT, referent_addr,
1.134 + referent_addr ? (address)*referent_addr : NULL);
1.135 + gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
1.136 + INTPTR_FORMAT, next_addr,
1.137 + next_addr ? (address)*next_addr : NULL);
1.138 + gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
1.139 + INTPTR_FORMAT, discovered_addr,
1.140 + discovered_addr ? (address)*discovered_addr : NULL);
1.141 + }
1.142 +#endif
1.143 +
1.144 + return size;
1.145 +}
1.146 +
1.147 +#define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
1.148 + \
1.149 +int instanceRefKlass:: \
1.150 +oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
1.151 + /* Get size before changing pointers */ \
1.152 + SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
1.153 + \
1.154 + int size = instanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
1.155 + \
1.156 + oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); \
1.157 + oop referent = *referent_addr; \
1.158 + if (referent != NULL) { \
1.159 + ReferenceProcessor* rp = closure->_ref_processor; \
1.160 + if (!referent->is_gc_marked() && (rp != NULL) && \
1.161 + rp->discover_reference(obj, reference_type())) { \
1.162 + return size; \
1.163 + } else { \
1.164 + /* treat referent as normal oop */ \
1.165 + SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
1.166 + closure->do_oop##nv_suffix(referent_addr); \
1.167 + } \
1.168 + } \
1.169 + \
1.170 + /* treat next as normal oop */ \
1.171 + oop* next_addr = java_lang_ref_Reference::next_addr(obj); \
1.172 + SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \
1.173 + closure->do_oop##nv_suffix(next_addr); \
1.174 + return size; \
1.175 +}
1.176 +
1.177 +#define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
1.178 + \
1.179 +int instanceRefKlass:: \
1.180 +oop_oop_iterate##nv_suffix##_m(oop obj, \
1.181 + OopClosureType* closure, \
1.182 + MemRegion mr) { \
1.183 + SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
1.184 + \
1.185 + int size = instanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
1.186 + \
1.187 + oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); \
1.188 + oop referent = *referent_addr; \
1.189 + if (referent != NULL && mr.contains(referent_addr)) { \
1.190 + ReferenceProcessor* rp = closure->_ref_processor; \
1.191 + if (!referent->is_gc_marked() && (rp != NULL) && \
1.192 + rp->discover_reference(obj, reference_type())) { \
1.193 + return size; \
1.194 + } else { \
1.195 + /* treat referent as normal oop */ \
1.196 + SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
1.197 + closure->do_oop##nv_suffix(referent_addr); \
1.198 + } \
1.199 + } \
1.200 + \
1.201 + /* treat next as normal oop */ \
1.202 + oop* next_addr = java_lang_ref_Reference::next_addr(obj); \
1.203 + if (mr.contains(next_addr)) { \
1.204 + SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
1.205 + closure->do_oop##nv_suffix(next_addr); \
1.206 + } \
1.207 + return size; \
1.208 +}
1.209 +
1.210 +ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
1.211 +ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
1.212 +ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
1.213 +ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
1.214 +
1.215 +
1.216 +#ifndef SERIALGC
1.217 +void instanceRefKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
1.218 + assert(!pm->depth_first(), "invariant");
1.219 + oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
1.220 + if (PSScavenge::should_scavenge(*referent_addr)) {
1.221 + ReferenceProcessor* rp = PSScavenge::reference_processor();
1.222 + if (rp->discover_reference(obj, reference_type())) {
1.223 + // reference already enqueued, referent and next will be traversed later
1.224 + instanceKlass::oop_copy_contents(pm, obj);
1.225 + return;
1.226 + } else {
1.227 + // treat referent as normal oop
1.228 + pm->claim_or_forward_breadth(referent_addr);
1.229 + }
1.230 + }
1.231 + // treat next as normal oop
1.232 + oop* next_addr = java_lang_ref_Reference::next_addr(obj);
1.233 + if (PSScavenge::should_scavenge(*next_addr)) {
1.234 + pm->claim_or_forward_breadth(next_addr);
1.235 + }
1.236 + instanceKlass::oop_copy_contents(pm, obj);
1.237 +}
1.238 +
1.239 +void instanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
1.240 + assert(pm->depth_first(), "invariant");
1.241 + oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
1.242 + if (PSScavenge::should_scavenge(*referent_addr)) {
1.243 + ReferenceProcessor* rp = PSScavenge::reference_processor();
1.244 + if (rp->discover_reference(obj, reference_type())) {
1.245 + // reference already enqueued, referent and next will be traversed later
1.246 + instanceKlass::oop_push_contents(pm, obj);
1.247 + return;
1.248 + } else {
1.249 + // treat referent as normal oop
1.250 + pm->claim_or_forward_depth(referent_addr);
1.251 + }
1.252 + }
1.253 + // treat next as normal oop
1.254 + oop* next_addr = java_lang_ref_Reference::next_addr(obj);
1.255 + if (PSScavenge::should_scavenge(*next_addr)) {
1.256 + pm->claim_or_forward_depth(next_addr);
1.257 + }
1.258 + instanceKlass::oop_push_contents(pm, obj);
1.259 +}
1.260 +
1.261 +int instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
1.262 + instanceKlass::oop_update_pointers(cm, obj);
1.263 +
1.264 + oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
1.265 + PSParallelCompact::adjust_pointer(referent_addr);
1.266 + oop* next_addr = java_lang_ref_Reference::next_addr(obj);
1.267 + PSParallelCompact::adjust_pointer(next_addr);
1.268 + oop* discovered_addr = java_lang_ref_Reference::discovered_addr(obj);
1.269 + PSParallelCompact::adjust_pointer(discovered_addr);
1.270 +
1.271 +#ifdef ASSERT
1.272 + if(TraceReferenceGC && PrintGCDetails) {
1.273 + gclog_or_tty->print_cr("instanceRefKlass::oop_update_pointers obj "
1.274 + INTPTR_FORMAT, (oopDesc*) obj);
1.275 + gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
1.276 + INTPTR_FORMAT, referent_addr,
1.277 + referent_addr ? (oopDesc*) *referent_addr : NULL);
1.278 + gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
1.279 + INTPTR_FORMAT, next_addr,
1.280 + next_addr ? (oopDesc*) *next_addr : NULL);
1.281 + gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
1.282 + INTPTR_FORMAT, discovered_addr,
1.283 + discovered_addr ? (oopDesc*) *discovered_addr : NULL);
1.284 + }
1.285 +#endif
1.286 +
1.287 + return size_helper();
1.288 +}
1.289 +
1.290 +int
1.291 +instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
1.292 + HeapWord* beg_addr, HeapWord* end_addr) {
1.293 + instanceKlass::oop_update_pointers(cm, obj, beg_addr, end_addr);
1.294 +
1.295 + oop* p;
1.296 + oop* referent_addr = p = java_lang_ref_Reference::referent_addr(obj);
1.297 + PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
1.298 + oop* next_addr = p = java_lang_ref_Reference::next_addr(obj);
1.299 + PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
1.300 + oop* discovered_addr = p = java_lang_ref_Reference::discovered_addr(obj);
1.301 + PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
1.302 +
1.303 +#ifdef ASSERT
1.304 + if(TraceReferenceGC && PrintGCDetails) {
1.305 + gclog_or_tty->print_cr("instanceRefKlass::oop_update_pointers obj "
1.306 + INTPTR_FORMAT, (oopDesc*) obj);
1.307 + gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
1.308 + INTPTR_FORMAT, referent_addr,
1.309 + referent_addr ? (oopDesc*) *referent_addr : NULL);
1.310 + gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
1.311 + INTPTR_FORMAT, next_addr,
1.312 + next_addr ? (oopDesc*) *next_addr : NULL);
1.313 + gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
1.314 + INTPTR_FORMAT, discovered_addr,
1.315 + discovered_addr ? (oopDesc*) *discovered_addr : NULL);
1.316 + }
1.317 +#endif
1.318 +
1.319 + return size_helper();
1.320 +}
1.321 +#endif // SERIALGC
1.322 +
1.323 +void instanceRefKlass::update_nonstatic_oop_maps(klassOop k) {
1.324 + // Clear the nonstatic oop-map entries corresponding to referent
1.325 + // and nextPending field. They are treated specially by the
1.326 + // garbage collector.
1.327 + // The discovered field is used only by the garbage collector
1.328 + // and is also treated specially.
1.329 + instanceKlass* ik = instanceKlass::cast(k);
1.330 +
1.331 + // Check that we have the right class
1.332 + debug_only(static bool first_time = true);
1.333 + assert(k == SystemDictionary::reference_klass() && first_time,
1.334 + "Invalid update of maps");
1.335 + debug_only(first_time = false);
1.336 + assert(ik->nonstatic_oop_map_size() == 1, "just checking");
1.337 +
1.338 + OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
1.339 +
1.340 + // Check that the current map is (2,4) - currently points at field with
1.341 + // offset 2 (words) and has 4 map entries.
1.342 + debug_only(int offset = java_lang_ref_Reference::referent_offset);
1.343 + debug_only(int length = ((java_lang_ref_Reference::discovered_offset -
1.344 + java_lang_ref_Reference::referent_offset)/wordSize) + 1);
1.345 +
1.346 + if (UseSharedSpaces) {
1.347 + assert(map->offset() == java_lang_ref_Reference::queue_offset &&
1.348 + map->length() == 1, "just checking");
1.349 + } else {
1.350 + assert(map->offset() == offset && map->length() == length,
1.351 + "just checking");
1.352 +
1.353 + // Update map to (3,1) - point to offset of 3 (words) with 1 map entry.
1.354 + map->set_offset(java_lang_ref_Reference::queue_offset);
1.355 + map->set_length(1);
1.356 + }
1.357 +}
1.358 +
1.359 +
1.360 +// Verification
1.361 +
1.362 +void instanceRefKlass::oop_verify_on(oop obj, outputStream* st) {
1.363 + instanceKlass::oop_verify_on(obj, st);
1.364 + // Verify referent field
1.365 + oop referent = java_lang_ref_Reference::referent(obj);
1.366 +
1.367 + // We should make this general to all heaps
1.368 + GenCollectedHeap* gch = NULL;
1.369 + if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap)
1.370 + gch = GenCollectedHeap::heap();
1.371 +
1.372 + if (referent != NULL) {
1.373 + guarantee(referent->is_oop(), "referent field heap failed");
1.374 + if (gch != NULL && !gch->is_in_youngest(obj))
1.375 + // We do a specific remembered set check here since the referent
1.376 + // field is not part of the oop mask and therefore skipped by the
1.377 + // regular verify code.
1.378 + obj->verify_old_oop(java_lang_ref_Reference::referent_addr(obj), true);
1.379 + }
1.380 + // Verify next field
1.381 + oop next = java_lang_ref_Reference::next(obj);
1.382 + if (next != NULL) {
1.383 + guarantee(next->is_oop(), "next field verify failed");
1.384 + guarantee(next->is_instanceRef(), "next field verify failed");
1.385 + if (gch != NULL && !gch->is_in_youngest(obj)) {
1.386 + // We do a specific remembered set check here since the next field is
1.387 + // not part of the oop mask and therefore skipped by the regular
1.388 + // verify code.
1.389 + obj->verify_old_oop(java_lang_ref_Reference::next_addr(obj), true);
1.390 + }
1.391 + }
1.392 +}
1.393 +
1.394 +void instanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) {
1.395 + // we may enter this with pending exception set
1.396 + PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
1.397 + Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
1.398 + ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD);
1.399 + assert(ObjectSynchronizer::current_thread_holds_lock(
1.400 + JavaThread::current(), h_lock),
1.401 + "Locking should have succeeded");
1.402 + if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
1.403 +}
1.404 +
1.405 +void instanceRefKlass::release_and_notify_pending_list_lock(
1.406 + BasicLock *pending_list_basic_lock) {
1.407 + // we may enter this with pending exception set
1.408 + PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
1.409 + //
1.410 + Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
1.411 + assert(ObjectSynchronizer::current_thread_holds_lock(
1.412 + JavaThread::current(), h_lock),
1.413 + "Lock should be held");
1.414 + // Notify waiters on pending lists lock if there is any reference.
1.415 + if (java_lang_ref_Reference::pending_list() != NULL) {
1.416 + ObjectSynchronizer::notifyall(h_lock, THREAD);
1.417 + }
1.418 + ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD);
1.419 + if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
1.420 +}
