| /* |
| * Copyright (c) 1997, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/javaClasses.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "gc_implementation/shared/markSweep.inline.hpp" |
| #include "gc_interface/collectedHeap.hpp" |
| #include "gc_interface/collectedHeap.inline.hpp" |
| #include "memory/genCollectedHeap.hpp" |
| #include "memory/genOopClosures.inline.hpp" |
| #include "oops/instanceRefKlass.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "utilities/preserveException.hpp" |
| #include "utilities/macros.hpp" |
| #if INCLUDE_ALL_GCS |
| #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
| #include "gc_implementation/g1/g1OopClosures.inline.hpp" |
| #include "gc_implementation/g1/g1RemSet.inline.hpp" |
| #include "gc_implementation/g1/heapRegionManager.inline.hpp" |
| #include "gc_implementation/parNew/parOopClosures.inline.hpp" |
| #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" |
| #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" |
| #include "oops/oop.pcgc.inline.hpp" |
| #endif // INCLUDE_ALL_GCS |
| |
| PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
| |
| template <class T> |
| void specialized_oop_follow_contents(InstanceRefKlass* ref, oop obj) { |
| T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
| T heap_oop = oopDesc::load_heap_oop(referent_addr); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj); |
| } |
| ) |
| if (!oopDesc::is_null(heap_oop)) { |
| oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); |
| if (!referent->is_gc_marked() && |
| MarkSweep::ref_processor()->discover_reference(obj, ref->reference_type())) { |
| // reference was discovered, referent will be traversed later |
| ref->InstanceKlass::oop_follow_contents(obj); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj); |
| } |
| ) |
| return; |
| } else { |
| // treat referent as normal oop |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj); |
| } |
| ) |
| MarkSweep::mark_and_push(referent_addr); |
| } |
| } |
| T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
| if (ReferenceProcessor::pending_list_uses_discovered_field()) { |
| // Treat discovered as normal oop, if ref is not "active", |
| // i.e. if next is non-NULL. |
| T next_oop = oopDesc::load_heap_oop(next_addr); |
| if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active" |
| T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Process discovered as normal " |
| INTPTR_FORMAT, discovered_addr); |
| } |
| ) |
| MarkSweep::mark_and_push(discovered_addr); |
| } |
| } else { |
| #ifdef ASSERT |
| // In the case of older JDKs which do not use the discovered |
| // field for the pending list, an inactive ref (next != NULL) |
| // must always have a NULL discovered field. |
| oop next = oopDesc::load_decode_heap_oop(next_addr); |
| oop discovered = java_lang_ref_Reference::discovered(obj); |
| assert(oopDesc::is_null(next) || oopDesc::is_null(discovered), |
| err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field", |
| (oopDesc*)obj)); |
| #endif |
| } |
| // treat next as normal oop. next is a link in the reference queue. |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr); |
| } |
| ) |
| MarkSweep::mark_and_push(next_addr); |
| ref->InstanceKlass::oop_follow_contents(obj); |
| } |
| |
| void InstanceRefKlass::oop_follow_contents(oop obj) { |
| if (UseCompressedOops) { |
| specialized_oop_follow_contents<narrowOop>(this, obj); |
| } else { |
| specialized_oop_follow_contents<oop>(this, obj); |
| } |
| } |
| |
| #if INCLUDE_ALL_GCS |
| template <class T> |
| void specialized_oop_follow_contents(InstanceRefKlass* ref, |
| ParCompactionManager* cm, |
| oop obj) { |
| T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
| T heap_oop = oopDesc::load_heap_oop(referent_addr); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj); |
| } |
| ) |
| if (!oopDesc::is_null(heap_oop)) { |
| oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); |
| if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) && |
| PSParallelCompact::ref_processor()-> |
| discover_reference(obj, ref->reference_type())) { |
| // reference already enqueued, referent will be traversed later |
| ref->InstanceKlass::oop_follow_contents(cm, obj); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj); |
| } |
| ) |
| return; |
| } else { |
| // treat referent as normal oop |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj); |
| } |
| ) |
| PSParallelCompact::mark_and_push(cm, referent_addr); |
| } |
| } |
| T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
| if (ReferenceProcessor::pending_list_uses_discovered_field()) { |
| // Treat discovered as normal oop, if ref is not "active", |
| // i.e. if next is non-NULL. |
| T next_oop = oopDesc::load_heap_oop(next_addr); |
| if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active" |
| T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Process discovered as normal " |
| INTPTR_FORMAT, discovered_addr); |
| } |
| ) |
| PSParallelCompact::mark_and_push(cm, discovered_addr); |
| } |
| } else { |
| #ifdef ASSERT |
| // In the case of older JDKs which do not use the discovered |
| // field for the pending list, an inactive ref (next != NULL) |
| // must always have a NULL discovered field. |
| T next = oopDesc::load_heap_oop(next_addr); |
| oop discovered = java_lang_ref_Reference::discovered(obj); |
| assert(oopDesc::is_null(next) || oopDesc::is_null(discovered), |
| err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field", |
| (oopDesc*)obj)); |
| #endif |
| } |
| PSParallelCompact::mark_and_push(cm, next_addr); |
| ref->InstanceKlass::oop_follow_contents(cm, obj); |
| } |
| |
| void InstanceRefKlass::oop_follow_contents(ParCompactionManager* cm, |
| oop obj) { |
| if (UseCompressedOops) { |
| specialized_oop_follow_contents<narrowOop>(this, cm, obj); |
| } else { |
| specialized_oop_follow_contents<oop>(this, cm, obj); |
| } |
| } |
| #endif // INCLUDE_ALL_GCS |
| |
| #ifdef ASSERT |
| template <class T> void trace_reference_gc(const char *s, oop obj, |
| T* referent_addr, |
| T* next_addr, |
| T* discovered_addr) { |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr("%s obj " INTPTR_FORMAT, s, (address)obj); |
| gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, referent_addr, |
| referent_addr ? |
| (address)oopDesc::load_decode_heap_oop(referent_addr) : NULL); |
| gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, next_addr, |
| next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL); |
| gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / " |
| INTPTR_FORMAT, discovered_addr, |
| discovered_addr ? |
| (address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL); |
| } |
| } |
| #endif |
| |
| template <class T> void specialized_oop_adjust_pointers(InstanceRefKlass *ref, oop obj) { |
| T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
| MarkSweep::adjust_pointer(referent_addr); |
| T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
| MarkSweep::adjust_pointer(next_addr); |
| T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
| MarkSweep::adjust_pointer(discovered_addr); |
| debug_only(trace_reference_gc("InstanceRefKlass::oop_adjust_pointers", obj, |
| referent_addr, next_addr, discovered_addr);) |
| } |
| |
| int InstanceRefKlass::oop_adjust_pointers(oop obj) { |
| int size = size_helper(); |
| InstanceKlass::oop_adjust_pointers(obj); |
| |
| if (UseCompressedOops) { |
| specialized_oop_adjust_pointers<narrowOop>(this, obj); |
| } else { |
| specialized_oop_adjust_pointers<oop>(this, obj); |
| } |
| return size; |
| } |
| |
| #define InstanceRefKlass_SPECIALIZED_OOP_ITERATE(T, nv_suffix, contains) \ |
| T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); \ |
| if (closure->apply_to_weak_ref_discovered_field()) { \ |
| closure->do_oop##nv_suffix(disc_addr); \ |
| } \ |
| \ |
| T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \ |
| T heap_oop = oopDesc::load_heap_oop(referent_addr); \ |
| ReferenceProcessor* rp = closure->_ref_processor; \ |
| if (!oopDesc::is_null(heap_oop)) { \ |
| oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); \ |
| if (!referent->is_gc_marked() && (rp != NULL) && \ |
| rp->discover_reference(obj, reference_type())) { \ |
| return size; \ |
| } else if (contains(referent_addr)) { \ |
| /* treat referent as normal oop */ \ |
| SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
| closure->do_oop##nv_suffix(referent_addr); \ |
| } \ |
| } \ |
| T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \ |
| if (ReferenceProcessor::pending_list_uses_discovered_field()) { \ |
| T next_oop = oopDesc::load_heap_oop(next_addr); \ |
| /* Treat discovered as normal oop, if ref is not "active" (next non-NULL) */\ |
| if (!oopDesc::is_null(next_oop) && contains(disc_addr)) { \ |
| /* i.e. ref is not "active" */ \ |
| debug_only( \ |
| if(TraceReferenceGC && PrintGCDetails) { \ |
| gclog_or_tty->print_cr(" Process discovered as normal " \ |
| INTPTR_FORMAT, disc_addr); \ |
| } \ |
| ) \ |
| SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
| closure->do_oop##nv_suffix(disc_addr); \ |
| } \ |
| } else { \ |
| /* In the case of older JDKs which do not use the discovered field for */ \ |
| /* the pending list, an inactive ref (next != NULL) must always have a */ \ |
| /* NULL discovered field. */ \ |
| debug_only( \ |
| T next_oop = oopDesc::load_heap_oop(next_addr); \ |
| T disc_oop = oopDesc::load_heap_oop(disc_addr); \ |
| assert(oopDesc::is_null(next_oop) || oopDesc::is_null(disc_oop), \ |
| err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL" \ |
| "discovered field", (oopDesc*)obj)); \ |
| ) \ |
| } \ |
| /* treat next as normal oop */ \ |
| if (contains(next_addr)) { \ |
| SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \ |
| closure->do_oop##nv_suffix(next_addr); \ |
| } \ |
| return size; \ |
| |
| |
| template <class T> bool contains(T *t) { return true; } |
| |
| // Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for |
| // all closures. Macros calling macros above for each oop 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); \ |
| \ |
| if (UseCompressedOops) { \ |
| InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \ |
| } else { \ |
| InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \ |
| } \ |
| } |
| |
| #if INCLUDE_ALL_GCS |
| #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
| \ |
| int InstanceRefKlass:: \ |
| oop_oop_iterate_backwards##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_backwards##nv_suffix(obj, closure); \ |
| \ |
| if (UseCompressedOops) { \ |
| InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \ |
| } else { \ |
| InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \ |
| } \ |
| } |
| #endif // INCLUDE_ALL_GCS |
| |
| |
| #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); \ |
| if (UseCompressedOops) { \ |
| InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr.contains); \ |
| } else { \ |
| InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr.contains); \ |
| } \ |
| } |
| |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) |
| #if INCLUDE_ALL_GCS |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
| #endif // INCLUDE_ALL_GCS |
| ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
| ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
| |
| #if INCLUDE_ALL_GCS |
| template <class T> |
| void specialized_oop_push_contents(InstanceRefKlass *ref, |
| PSPromotionManager* pm, oop obj) { |
| T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
| if (PSScavenge::should_scavenge(referent_addr)) { |
| ReferenceProcessor* rp = PSScavenge::reference_processor(); |
| if (rp->discover_reference(obj, ref->reference_type())) { |
| // reference already enqueued, referent and next will be traversed later |
| ref->InstanceKlass::oop_push_contents(pm, obj); |
| return; |
| } else { |
| // treat referent as normal oop |
| pm->claim_or_forward_depth(referent_addr); |
| } |
| } |
| // Treat discovered as normal oop, if ref is not "active", |
| // i.e. if next is non-NULL. |
| T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
| if (ReferenceProcessor::pending_list_uses_discovered_field()) { |
| T next_oop = oopDesc::load_heap_oop(next_addr); |
| if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active" |
| T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
| debug_only( |
| if(TraceReferenceGC && PrintGCDetails) { |
| gclog_or_tty->print_cr(" Process discovered as normal " |
| INTPTR_FORMAT, discovered_addr); |
| } |
| ) |
| if (PSScavenge::should_scavenge(discovered_addr)) { |
| pm->claim_or_forward_depth(discovered_addr); |
| } |
| } |
| } else { |
| #ifdef ASSERT |
| // In the case of older JDKs which do not use the discovered |
| // field for the pending list, an inactive ref (next != NULL) |
| // must always have a NULL discovered field. |
| oop next = oopDesc::load_decode_heap_oop(next_addr); |
| oop discovered = java_lang_ref_Reference::discovered(obj); |
| assert(oopDesc::is_null(next) || oopDesc::is_null(discovered), |
| err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field", |
| (oopDesc*)obj)); |
| #endif |
| } |
| |
| // Treat next as normal oop; next is a link in the reference queue. |
| if (PSScavenge::should_scavenge(next_addr)) { |
| pm->claim_or_forward_depth(next_addr); |
| } |
| ref->InstanceKlass::oop_push_contents(pm, obj); |
| } |
| |
| void InstanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { |
| if (UseCompressedOops) { |
| specialized_oop_push_contents<narrowOop>(this, pm, obj); |
| } else { |
| specialized_oop_push_contents<oop>(this, pm, obj); |
| } |
| } |
| |
| template <class T> |
| void specialized_oop_update_pointers(InstanceRefKlass *ref, |
| ParCompactionManager* cm, oop obj) { |
| T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
| PSParallelCompact::adjust_pointer(referent_addr); |
| T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
| PSParallelCompact::adjust_pointer(next_addr); |
| T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
| PSParallelCompact::adjust_pointer(discovered_addr); |
| debug_only(trace_reference_gc("InstanceRefKlass::oop_update_ptrs", obj, |
| referent_addr, next_addr, discovered_addr);) |
| } |
| |
| int InstanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { |
| InstanceKlass::oop_update_pointers(cm, obj); |
| if (UseCompressedOops) { |
| specialized_oop_update_pointers<narrowOop>(this, cm, obj); |
| } else { |
| specialized_oop_update_pointers<oop>(this, cm, obj); |
| } |
| return size_helper(); |
| } |
| #endif // INCLUDE_ALL_GCS |
| |
| void InstanceRefKlass::update_nonstatic_oop_maps(Klass* 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_count() == 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(unsigned int count = ((java_lang_ref_Reference::discovered_offset - |
| java_lang_ref_Reference::referent_offset)/heapOopSize) + 1); |
| |
| if (UseSharedSpaces) { |
| assert(map->offset() == java_lang_ref_Reference::queue_offset && |
| map->count() == 1, "just checking"); |
| } else { |
| assert(map->offset() == offset && map->count() == count, |
| "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_count(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"); |
| } |
| // 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"); |
| } |
| } |
| |
| bool InstanceRefKlass::owns_pending_list_lock(JavaThread* thread) { |
| if (java_lang_ref_Reference::pending_list_lock() == NULL) return false; |
| Handle h_lock(thread, java_lang_ref_Reference::pending_list_lock()); |
| return ObjectSynchronizer::current_thread_holds_lock(thread, h_lock); |
| } |
| |
| 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 |
| |
| // Create a HandleMark in case we retry a GC multiple times. |
| // Each time we attempt the GC, we allocate the handle below |
| // to hold the pending list lock. We want to free this handle. |
| HandleMark hm; |
| |
| 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 |
| |
| // Create a HandleMark in case we retry a GC multiple times. |
| // Each time we attempt the GC, we allocate the handle below |
| // to hold the pending list lock. We want to free this handle. |
| HandleMark hm; |
| |
| 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; |
| } |
