Java example source code file (parOopClosures.inline.hpp)
The parOopClosures.inline.hpp Java example source code
/*
* Copyright (c) 2007, 2013, 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.
*
*/
#ifndef SHARE_VM_GC_IMPLEMENTATION_PARNEW_PAROOPCLOSURES_INLINE_HPP
#define SHARE_VM_GC_IMPLEMENTATION_PARNEW_PAROOPCLOSURES_INLINE_HPP
#include "gc_implementation/parNew/parNewGeneration.hpp"
#include "gc_implementation/parNew/parOopClosures.hpp"
#include "memory/cardTableRS.hpp"
template <class T> inline void ParScanWeakRefClosure::do_oop_work(T* p) {
assert (!oopDesc::is_null(*p), "null weak reference?");
oop obj = oopDesc::load_decode_heap_oop_not_null(p);
// weak references are sometimes scanned twice; must check
// that to-space doesn't already contain this object
if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
// we need to ensure that it is copied (see comment in
// ParScanClosure::do_oop_work).
Klass* objK = obj->klass();
markOop m = obj->mark();
oop new_obj;
if (m->is_marked()) { // Contains forwarding pointer.
new_obj = ParNewGeneration::real_forwardee(obj);
} else {
size_t obj_sz = obj->size_given_klass(objK);
new_obj = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state,
obj, obj_sz, m);
}
oopDesc::encode_store_heap_oop_not_null(p, new_obj);
}
}
inline void ParScanWeakRefClosure::do_oop_nv(oop* p) { ParScanWeakRefClosure::do_oop_work(p); }
inline void ParScanWeakRefClosure::do_oop_nv(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); }
template <class T> inline void ParScanClosure::par_do_barrier(T* p) {
assert(generation()->is_in_reserved(p), "expected ref in generation");
assert(!oopDesc::is_null(*p), "expected non-null object");
oop obj = oopDesc::load_decode_heap_oop_not_null(p);
// If p points to a younger generation, mark the card.
if ((HeapWord*)obj < gen_boundary()) {
rs()->write_ref_field_gc_par(p, obj);
}
}
template <class T>
inline void ParScanClosure::do_oop_work(T* p,
bool gc_barrier,
bool root_scan) {
assert((!Universe::heap()->is_in_reserved(p) ||
generation()->is_in_reserved(p))
&& (generation()->level() == 0 || gc_barrier),
"The gen must be right, and we must be doing the barrier "
"in older generations.");
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop)) {
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
if ((HeapWord*)obj < _boundary) {
#ifndef PRODUCT
if (_g->to()->is_in_reserved(obj)) {
tty->print_cr("Scanning field (" PTR_FORMAT ") twice?", p);
GenCollectedHeap* gch = (GenCollectedHeap*)Universe::heap();
Space* sp = gch->space_containing(p);
oop obj = oop(sp->block_start(p));
assert((HeapWord*)obj < (HeapWord*)p, "Error");
tty->print_cr("Object: " PTR_FORMAT, (void *)obj);
tty->print_cr("-------");
obj->print();
tty->print_cr("-----");
tty->print_cr("Heap:");
tty->print_cr("-----");
gch->print();
ShouldNotReachHere();
}
#endif
// OK, we need to ensure that it is copied.
// We read the klass and mark in this order, so that we can reliably
// get the size of the object: if the mark we read is not a
// forwarding pointer, then the klass is valid: the klass is only
// overwritten with an overflow next pointer after the object is
// forwarded.
Klass* objK = obj->klass();
markOop m = obj->mark();
oop new_obj;
if (m->is_marked()) { // Contains forwarding pointer.
new_obj = ParNewGeneration::real_forwardee(obj);
oopDesc::encode_store_heap_oop_not_null(p, new_obj);
#ifndef PRODUCT
if (TraceScavenge) {
gclog_or_tty->print_cr("{%s %s ( " PTR_FORMAT " ) " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
"forwarded ",
new_obj->klass()->internal_name(), p, (void *)obj, (void *)new_obj, new_obj->size());
}
#endif
} else {
size_t obj_sz = obj->size_given_klass(objK);
new_obj = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m);
oopDesc::encode_store_heap_oop_not_null(p, new_obj);
if (root_scan) {
// This may have pushed an object. If we have a root
// category with a lot of roots, can't let the queue get too
// full:
(void)_par_scan_state->trim_queues(10 * ParallelGCThreads);
}
}
if (is_scanning_a_klass()) {
do_klass_barrier();
} else if (gc_barrier) {
// Now call parent closure
par_do_barrier(p);
}
}
}
}
inline void ParScanWithBarrierClosure::do_oop_nv(oop* p) { ParScanClosure::do_oop_work(p, true, false); }
inline void ParScanWithBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); }
inline void ParScanWithoutBarrierClosure::do_oop_nv(oop* p) { ParScanClosure::do_oop_work(p, false, false); }
inline void ParScanWithoutBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, false, false); }
#endif // SHARE_VM_GC_IMPLEMENTATION_PARNEW_PAROOPCLOSURES_INLINE_HPP
Other Java examples (source code examples)Here is a short list of links related to this Java parOopClosures.inline.hpp source code file: |
The search page
Other Java source code examples at this package level
Click here to learn more about this project
