Mercurial > hg > truffle
diff src/share/vm/memory/genOopClosures.inline.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | ba764ed4b6f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/memory/genOopClosures.inline.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,119 @@ +/* + * Copyright 2001-2007 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 OopsInGenClosure::OopsInGenClosure(Generation* gen) : + OopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) { + set_generation(gen); +} + +inline void OopsInGenClosure::set_generation(Generation* gen) { + _gen = gen; + _gen_boundary = _gen->reserved().start(); + // Barrier set for the heap, must be set after heap is initialized + if (_rs == NULL) { + GenRemSet* rs = SharedHeap::heap()->rem_set(); + assert(rs->rs_kind() == GenRemSet::CardTable, "Wrong rem set kind"); + _rs = (CardTableRS*)rs; + } +} + +inline void OopsInGenClosure::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->inline_write_ref_field_gc(p, obj); + } +} + +// NOTE! Any changes made here should also be made +// in FastScanClosure::do_oop(); +inline void ScanClosure::do_oop(oop* p) { + oop obj = *p; + // Should we copy the obj? + if (obj != NULL) { + if ((HeapWord*)obj < _boundary) { + assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); + if (obj->is_forwarded()) { + *p = obj->forwardee(); + } else { + *p = _g->copy_to_survivor_space(obj, p); + } + } + if (_gc_barrier) { + // Now call parent closure + do_barrier(p); + } + } +} + +inline void ScanClosure::do_oop_nv(oop* p) { + ScanClosure::do_oop(p); +} + +// NOTE! Any changes made here should also be made +// in ScanClosure::do_oop(); +inline void FastScanClosure::do_oop(oop* p) { + oop obj = *p; + // Should we copy the obj? + if (obj != NULL) { + if ((HeapWord*)obj < _boundary) { + assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); + if (obj->is_forwarded()) { + *p = obj->forwardee(); + } else { + *p = _g->copy_to_survivor_space(obj, p); + } + if (_gc_barrier) { + // Now call parent closure + do_barrier(p); + } + } + } +} + +inline void FastScanClosure::do_oop_nv(oop* p) { + FastScanClosure::do_oop(p); +} + +// Note similarity to ScanClosure; the difference is that +// the barrier set is taken care of outside this closure. +inline void ScanWeakRefClosure::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)) { + if (obj->is_forwarded()) { + *p = obj->forwardee(); + } else { + *p = _g->copy_to_survivor_space(obj, p); + } + } +} + +inline void ScanWeakRefClosure::do_oop_nv(oop* p) { + ScanWeakRefClosure::do_oop(p); +}