/*
* Copyright 1997-2008 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"
template <class T>
static 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, 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 already enqueued, 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, obj);
}
)
return;
} else {
// treat referent as normal oop
debug_only(
if(TraceReferenceGC && PrintGCDetails) {
gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, obj);
}
)
MarkSweep::mark_and_push(referent_addr);
}
}
// treat next as normal oop. next is a link in the pending list.
T* next_addr = (T*)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);
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);
}
}
#ifndef SERIALGC
template <class T>
static 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, 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, obj);
}
)
return;
} else {
// treat referent as normal oop
debug_only(
if(TraceReferenceGC && PrintGCDetails) {
gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, obj);
}
)
PSParallelCompact::mark_and_push(cm, referent_addr);
}
}
// treat next as normal oop. next is a link in the pending list.
T* next_addr = (T*)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);
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 // SERIALGC
#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) \
if (closure->apply_to_weak_ref_discovered_field()) { \
T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); \
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); \
if (!oopDesc::is_null(heap_oop) && contains(referent_addr)) { \
ReferenceProcessor* rp = closure->_ref_processor; \
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 { \
/* 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 */ \
T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \
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); \
} \
}
#ifndef SERIALGC
#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 // !SERIALGC
#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)
#ifndef SERIALGC
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 // SERIALGC
ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
#ifndef SERIALGC
template <class T>
void specialized_oop_copy_contents(instanceRefKlass *ref,
PSPromotionManager* pm, oop obj) {
assert(!pm->depth_first(), "invariant");
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_copy_contents(pm, obj);
return;
} else {
// treat referent as normal oop
pm->claim_or_forward_breadth(referent_addr);
}
}
// treat next as normal oop
T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
if (PSScavenge::should_scavenge(next_addr)) {
pm->claim_or_forward_breadth(next_addr);
}
ref->instanceKlass::oop_copy_contents(pm, obj);
}
void instanceRefKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
if (UseCompressedOops) {
specialized_oop_copy_contents<narrowOop>(this, pm, obj);
} else {
specialized_oop_copy_contents<oop>(this, pm, obj);
}
}
template <class T>
void specialized_oop_push_contents(instanceRefKlass *ref,
PSPromotionManager* pm, oop obj) {
assert(pm->depth_first(), "invariant");
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 next as normal oop
T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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();
}
template <class T> void
specialized_oop_update_pointers(ParCompactionManager* cm, oop obj,
HeapWord* beg_addr, HeapWord* end_addr) {
T* p;
T* referent_addr = p = (T*)java_lang_ref_Reference::referent_addr(obj);
PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
T* next_addr = p = (T*)java_lang_ref_Reference::next_addr(obj);
PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
T* discovered_addr = p = (T*)java_lang_ref_Reference::discovered_addr(obj);
PSParallelCompact::adjust_pointer(p, beg_addr, end_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,
HeapWord* beg_addr, HeapWord* end_addr) {
instanceKlass::oop_update_pointers(cm, obj, beg_addr, end_addr);
if (UseCompressedOops) {
specialized_oop_update_pointers<narrowOop>(cm, obj, beg_addr, end_addr);
} else {
specialized_oop_update_pointers<oop>(cm, obj, beg_addr, end_addr);
}
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)/heapOopSize) + 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.
if (UseCompressedOops) {
narrowOop* referent_addr = (narrowOop*)java_lang_ref_Reference::referent_addr(obj);
obj->verify_old_oop(referent_addr, true);
} else {
oop* referent_addr = (oop*)java_lang_ref_Reference::referent_addr(obj);
obj->verify_old_oop(referent_addr, 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.
if (UseCompressedOops) {
narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj);
obj->verify_old_oop(next_addr, true);
} else {
oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj);
obj->verify_old_oop(next_addr, 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;
}