| /* |
| * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| # include "incls/_precompiled.incl" |
| # include "incls/_instanceRefKlass.cpp.incl" |
| |
| void instanceRefKlass::oop_follow_contents(oop obj) { |
| oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); |
| oop referent = *referent_addr; |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (address)obj); |
| } |
| ) |
| if (referent != NULL) { |
| if (!referent->is_gc_marked() && |
| MarkSweep::ref_processor()-> |
| discover_reference(obj, reference_type())) { |
| // reference already enqueued, referent will be traversed later |
| instanceKlass::oop_follow_contents(obj); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (address)obj); |
| } |
| ) |
| return; |
| } else { |
| // treat referent as normal oop |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (address)obj); |
| } |
| ) |
| MarkSweep::mark_and_push(referent_addr); |
| } |
| } |
| // treat next as normal oop. next is a link in the pending list. |
| oop* next_addr = java_lang_ref_Reference::next_addr(obj); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr); |
| } |
| ) |
| MarkSweep::mark_and_push(next_addr); |
| instanceKlass::oop_follow_contents(obj); |
| } |
| |
| #ifndef SERIALGC |
| void instanceRefKlass::oop_follow_contents(ParCompactionManager* cm, |
| oop obj) { |
| oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); |
| oop referent = *referent_addr; |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (address)obj); |
| } |
| ) |
| if (referent != NULL) { |
| if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) && |
| PSParallelCompact::ref_processor()-> |
| discover_reference(obj, reference_type())) { |
| // reference already enqueued, referent will be traversed later |
| instanceKlass::oop_follow_contents(cm, obj); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (address)obj); |
| } |
| ) |
| return; |
| } else { |
| // treat referent as normal oop |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (address)obj); |
| } |
| ) |
| PSParallelCompact::mark_and_push(cm, referent_addr); |
| } |
| } |
| // treat next as normal oop. next is a link in the pending list. |
| oop* next_addr = java_lang_ref_Reference::next_addr(obj); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr); |
| } |
| ) |
| PSParallelCompact::mark_and_push(cm, next_addr); |
| instanceKlass::oop_follow_contents(cm, obj); |
| } |
| #endif // SERIALGC |
| |
| |
| int instanceRefKlass::oop_adjust_pointers(oop obj) { |
| int size = size_helper(); |
| instanceKlass::oop_adjust_pointers(obj); |
| |
| oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); |
| MarkSweep::adjust_pointer(referent_addr); |
| oop* next_addr = java_lang_ref_Reference::next_addr(obj); |
| MarkSweep::adjust_pointer(next_addr); |
| oop* discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
| MarkSweep::adjust_pointer(discovered_addr); |
| |
| #ifdef ASSERT |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr("instanceRefKlass::oop_adjust_pointers obj " |
| INTPTR_FORMAT, (address)obj); |
| gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, referent_addr, |
| referent_addr ? (address)*referent_addr : NULL); |
| gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, next_addr, |
| next_addr ? (address)*next_addr : NULL); |
| gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, discovered_addr, |
| discovered_addr ? (address)*discovered_addr : NULL); |
| } |
| #endif |
| |
| return size; |
| } |
| |
| #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
| \ |
| int instanceRefKlass:: \ |
| oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \ |
| /* Get size before changing pointers */ \ |
| SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ |
| \ |
| int size = instanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \ |
| \ |
| oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); \ |
| oop referent = *referent_addr; \ |
| if (referent != NULL) { \ |
| ReferenceProcessor* rp = closure->_ref_processor; \ |
| if (!referent->is_gc_marked() && (rp != NULL) && \ |
| rp->discover_reference(obj, reference_type())) { \ |
| return size; \ |
| } else { \ |
| /* treat referent as normal oop */ \ |
| SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
| closure->do_oop##nv_suffix(referent_addr); \ |
| } \ |
| } \ |
| \ |
| /* treat next as normal oop */ \ |
| oop* next_addr = java_lang_ref_Reference::next_addr(obj); \ |
| SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \ |
| closure->do_oop##nv_suffix(next_addr); \ |
| return size; \ |
| } |
| |
| #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ |
| \ |
| int instanceRefKlass:: \ |
| oop_oop_iterate##nv_suffix##_m(oop obj, \ |
| OopClosureType* closure, \ |
| MemRegion mr) { \ |
| SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ |
| \ |
| int size = instanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \ |
| \ |
| oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); \ |
| oop referent = *referent_addr; \ |
| if (referent != NULL && mr.contains(referent_addr)) { \ |
| ReferenceProcessor* rp = closure->_ref_processor; \ |
| if (!referent->is_gc_marked() && (rp != NULL) && \ |
| rp->discover_reference(obj, reference_type())) { \ |
| return size; \ |
| } else { \ |
| /* treat referent as normal oop */ \ |
| SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
| closure->do_oop##nv_suffix(referent_addr); \ |
| } \ |
| } \ |
| \ |
| /* treat next as normal oop */ \ |
| oop* next_addr = java_lang_ref_Reference::next_addr(obj); \ |
| if (mr.contains(next_addr)) { \ |
| SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
| closure->do_oop##nv_suffix(next_addr); \ |
| } \ |
| return size; \ |
| } |
| |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) |
| ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
| ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
| |
| |
| #ifndef SERIALGC |
| void instanceRefKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) { |
| assert(!pm->depth_first(), "invariant"); |
| oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); |
| if (PSScavenge::should_scavenge(*referent_addr)) { |
| ReferenceProcessor* rp = PSScavenge::reference_processor(); |
| if (rp->discover_reference(obj, reference_type())) { |
| // reference already enqueued, referent and next will be traversed later |
| instanceKlass::oop_copy_contents(pm, obj); |
| return; |
| } else { |
| // treat referent as normal oop |
| pm->claim_or_forward_breadth(referent_addr); |
| } |
| } |
| // treat next as normal oop |
| oop* next_addr = java_lang_ref_Reference::next_addr(obj); |
| if (PSScavenge::should_scavenge(*next_addr)) { |
| pm->claim_or_forward_breadth(next_addr); |
| } |
| instanceKlass::oop_copy_contents(pm, obj); |
| } |
| |
| void instanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { |
| assert(pm->depth_first(), "invariant"); |
| oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); |
| if (PSScavenge::should_scavenge(*referent_addr)) { |
| ReferenceProcessor* rp = PSScavenge::reference_processor(); |
| if (rp->discover_reference(obj, reference_type())) { |
| // reference already enqueued, referent and next will be traversed later |
| instanceKlass::oop_push_contents(pm, obj); |
| return; |
| } else { |
| // treat referent as normal oop |
| pm->claim_or_forward_depth(referent_addr); |
| } |
| } |
| // treat next as normal oop |
| oop* next_addr = java_lang_ref_Reference::next_addr(obj); |
| if (PSScavenge::should_scavenge(*next_addr)) { |
| pm->claim_or_forward_depth(next_addr); |
| } |
| instanceKlass::oop_push_contents(pm, obj); |
| } |
| |
| int instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { |
| instanceKlass::oop_update_pointers(cm, obj); |
| |
| oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); |
| PSParallelCompact::adjust_pointer(referent_addr); |
| oop* next_addr = java_lang_ref_Reference::next_addr(obj); |
| PSParallelCompact::adjust_pointer(next_addr); |
| oop* discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
| PSParallelCompact::adjust_pointer(discovered_addr); |
| |
| #ifdef ASSERT |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr("instanceRefKlass::oop_update_pointers obj " |
| INTPTR_FORMAT, (oopDesc*) obj); |
| gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, referent_addr, |
| referent_addr ? (oopDesc*) *referent_addr : NULL); |
| gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, next_addr, |
| next_addr ? (oopDesc*) *next_addr : NULL); |
| gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, discovered_addr, |
| discovered_addr ? (oopDesc*) *discovered_addr : NULL); |
| } |
| #endif |
| |
| return size_helper(); |
| } |
| |
| int |
| instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj, |
| HeapWord* beg_addr, HeapWord* end_addr) { |
| instanceKlass::oop_update_pointers(cm, obj, beg_addr, end_addr); |
| |
| oop* p; |
| oop* referent_addr = p = java_lang_ref_Reference::referent_addr(obj); |
| PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); |
| oop* next_addr = p = java_lang_ref_Reference::next_addr(obj); |
| PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); |
| oop* discovered_addr = p = java_lang_ref_Reference::discovered_addr(obj); |
| PSParallelCompact::adjust_pointer(p, beg_addr, end_addr); |
| |
| #ifdef ASSERT |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr("instanceRefKlass::oop_update_pointers obj " |
| INTPTR_FORMAT, (oopDesc*) obj); |
| gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, referent_addr, |
| referent_addr ? (oopDesc*) *referent_addr : NULL); |
| gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, next_addr, |
| next_addr ? (oopDesc*) *next_addr : NULL); |
| gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, discovered_addr, |
| discovered_addr ? (oopDesc*) *discovered_addr : NULL); |
| } |
| #endif |
| |
| return size_helper(); |
| } |
| #endif // SERIALGC |
| |
| void instanceRefKlass::update_nonstatic_oop_maps(klassOop k) { |
| // Clear the nonstatic oop-map entries corresponding to referent |
| // and nextPending field. They are treated specially by the |
| // garbage collector. |
| // The discovered field is used only by the garbage collector |
| // and is also treated specially. |
| instanceKlass* ik = instanceKlass::cast(k); |
| |
| // Check that we have the right class |
| debug_only(static bool first_time = true); |
| assert(k == SystemDictionary::reference_klass() && first_time, |
| "Invalid update of maps"); |
| debug_only(first_time = false); |
| assert(ik->nonstatic_oop_map_size() == 1, "just checking"); |
| |
| OopMapBlock* map = ik->start_of_nonstatic_oop_maps(); |
| |
| // Check that the current map is (2,4) - currently points at field with |
| // offset 2 (words) and has 4 map entries. |
| debug_only(int offset = java_lang_ref_Reference::referent_offset); |
| debug_only(int length = ((java_lang_ref_Reference::discovered_offset - |
| java_lang_ref_Reference::referent_offset)/wordSize) + 1); |
| |
| if (UseSharedSpaces) { |
| assert(map->offset() == java_lang_ref_Reference::queue_offset && |
| map->length() == 1, "just checking"); |
| } else { |
| assert(map->offset() == offset && map->length() == length, |
| "just checking"); |
| |
| // Update map to (3,1) - point to offset of 3 (words) with 1 map entry. |
| map->set_offset(java_lang_ref_Reference::queue_offset); |
| map->set_length(1); |
| } |
| } |
| |
| |
| // Verification |
| |
| void instanceRefKlass::oop_verify_on(oop obj, outputStream* st) { |
| instanceKlass::oop_verify_on(obj, st); |
| // Verify referent field |
| oop referent = java_lang_ref_Reference::referent(obj); |
| |
| // We should make this general to all heaps |
| GenCollectedHeap* gch = NULL; |
| if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap) |
| gch = GenCollectedHeap::heap(); |
| |
| if (referent != NULL) { |
| guarantee(referent->is_oop(), "referent field heap failed"); |
| if (gch != NULL && !gch->is_in_youngest(obj)) |
| // We do a specific remembered set check here since the referent |
| // field is not part of the oop mask and therefore skipped by the |
| // regular verify code. |
| obj->verify_old_oop(java_lang_ref_Reference::referent_addr(obj), true); |
| } |
| // Verify next field |
| oop next = java_lang_ref_Reference::next(obj); |
| if (next != NULL) { |
| guarantee(next->is_oop(), "next field verify failed"); |
| guarantee(next->is_instanceRef(), "next field verify failed"); |
| if (gch != NULL && !gch->is_in_youngest(obj)) { |
| // We do a specific remembered set check here since the next field is |
| // not part of the oop mask and therefore skipped by the regular |
| // verify code. |
| obj->verify_old_oop(java_lang_ref_Reference::next_addr(obj), true); |
| } |
| } |
| } |
| |
| void instanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) { |
| // we may enter this with pending exception set |
| PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument |
| Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
| ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD); |
| assert(ObjectSynchronizer::current_thread_holds_lock( |
| JavaThread::current(), h_lock), |
| "Locking should have succeeded"); |
| if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; |
| } |
| |
| void instanceRefKlass::release_and_notify_pending_list_lock( |
| BasicLock *pending_list_basic_lock) { |
| // we may enter this with pending exception set |
| PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument |
| // |
| Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
| assert(ObjectSynchronizer::current_thread_holds_lock( |
| JavaThread::current(), h_lock), |
| "Lock should be held"); |
| // Notify waiters on pending lists lock if there is any reference. |
| if (java_lang_ref_Reference::pending_list() != NULL) { |
| ObjectSynchronizer::notifyall(h_lock, THREAD); |
| } |
| ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD); |
| if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; |
| } |
