Mercurial > hg > truffle
view src/share/vm/gc_implementation/parNew/parOopClosures.inline.hpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | ba764ed4b6f2 |
line wrap: on
line source
/* * Copyright (c) 2007 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. * */ inline void ParScanWeakRefClosure::do_oop(oop* p) { oop obj = *p; assert (obj != NULL, "null weak reference?"); // 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). klassOop objK = obj->klass(); markOop m = obj->mark(); if (m->is_marked()) { // Contains forwarding pointer. *p = ParNewGeneration::real_forwardee(obj); } else { size_t obj_sz = obj->size_given_klass(objK->klass_part()); *p = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m); } } } inline void ParScanWeakRefClosure::do_oop_nv(oop* p) { ParScanWeakRefClosure::do_oop(p); } inline void ParScanClosure::par_do_barrier(oop* p) { assert(generation()->is_in_reserved(p), "expected ref in generation"); oop obj = *p; assert(obj != NULL, "expected non-null object"); // If p points to a younger generation, mark the card. if ((HeapWord*)obj < gen_boundary()) { rs()->write_ref_field_gc_par(p, obj); } } inline void ParScanClosure::do_oop_work(oop* p, bool gc_barrier, bool root_scan) { oop obj = *p; 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."); if (obj != NULL) { if ((HeapWord*)obj < _boundary) { assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); // 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. klassOop objK = obj->klass(); markOop m = obj->mark(); if (m->is_marked()) { // Contains forwarding pointer. *p = ParNewGeneration::real_forwardee(obj); } else { size_t obj_sz = obj->size_given_klass(objK->klass_part()); *p = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m); 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 (gc_barrier) { // Now call parent closure par_do_barrier(p); } } } }