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src/share/vm/oops/markOop.inline.hpp@c89f86385056 (annotated)

src/share/vm/oops/markOop.inline.hpp

Fri, 20 Mar 2009 23:19:36 -0700

author

jrose

date

Fri, 20 Mar 2009 23:19:36 -0700

changeset 1100

c89f86385056

parent 777

37f87013dfd8

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6814659: separable cleanups and subroutines for 6655638
Summary: preparatory but separable changes for method handles
Reviewed-by: kvn, never

duke@435	1	/*
duke@435	2	* Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// Should this header be preserved during GC?
duke@435	26	inline bool markOopDesc::must_be_preserved_with_bias(oop obj_containing_mark) const {
duke@435	27	assert(UseBiasedLocking, "unexpected");
duke@435	28	if (has_bias_pattern()) {
duke@435	29	// Will reset bias at end of collection
duke@435	30	// Mark words of biased and currently locked objects are preserved separately
duke@435	31	return false;
duke@435	32	}
duke@435	33	markOop prototype_header = prototype_for_object(obj_containing_mark);
duke@435	34	if (prototype_header->has_bias_pattern()) {
duke@435	35	// Individual instance which has its bias revoked; must return
duke@435	36	// true for correctness
duke@435	37	return true;
duke@435	38	}
duke@435	39	return (!is_unlocked() || !has_no_hash());
duke@435	40	}
duke@435	41
ysr@777	42	inline bool markOopDesc::must_be_preserved(oop obj_containing_mark) const {
ysr@777	43	if (!UseBiasedLocking)
ysr@777	44	return (!is_unlocked() || !has_no_hash());
ysr@777	45	return must_be_preserved_with_bias(obj_containing_mark);
ysr@777	46	}
ysr@777	47
duke@435	48	// Should this header (including its age bits) be preserved in the
duke@435	49	// case of a promotion failure during scavenge?
duke@435	50	inline bool markOopDesc::must_be_preserved_with_bias_for_promotion_failure(oop obj_containing_mark) const {
duke@435	51	assert(UseBiasedLocking, "unexpected");
duke@435	52	// We don't explicitly save off the mark words of biased and
duke@435	53	// currently-locked objects during scavenges, so if during a
duke@435	54	// promotion failure we encounter either a biased mark word or a
duke@435	55	// klass which still has a biasable prototype header, we have to
duke@435	56	// preserve the mark word. This results in oversaving, but promotion
duke@435	57	// failures are rare, and this avoids adding more complex logic to
duke@435	58	// the scavengers to call new variants of
duke@435	59	// BiasedLocking::preserve_marks() / restore_marks() in the middle
duke@435	60	// of a scavenge when a promotion failure has first been detected.
duke@435	61	if (has_bias_pattern() ||
duke@435	62	prototype_for_object(obj_containing_mark)->has_bias_pattern()) {
duke@435	63	return true;
duke@435	64	}
duke@435	65	return (this != prototype());
duke@435	66	}
duke@435	67
ysr@777	68	inline bool markOopDesc::must_be_preserved_for_promotion_failure(oop obj_containing_mark) const {
ysr@777	69	if (!UseBiasedLocking)
ysr@777	70	return (this != prototype());
ysr@777	71	return must_be_preserved_with_bias_for_promotion_failure(obj_containing_mark);
ysr@777	72	}
ysr@777	73
ysr@777	74
duke@435	75	// Should this header (including its age bits) be preserved in the
duke@435	76	// case of a scavenge in which CMS is the old generation?
duke@435	77	inline bool markOopDesc::must_be_preserved_with_bias_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const {
duke@435	78	assert(UseBiasedLocking, "unexpected");
duke@435	79	// CMS scavenges preserve mark words in similar fashion to promotion failures; see above
duke@435	80	if (has_bias_pattern() ||
duke@435	81	klass_of_obj_containing_mark->klass_part()->prototype_header()->has_bias_pattern()) {
duke@435	82	return true;
duke@435	83	}
duke@435	84	return (this != prototype());
duke@435	85	}
ysr@777	86	inline bool markOopDesc::must_be_preserved_for_cms_scavenge(klassOop klass_of_obj_containing_mark) const {
ysr@777	87	if (!UseBiasedLocking)
ysr@777	88	return (this != prototype());
ysr@777	89	return must_be_preserved_with_bias_for_cms_scavenge(klass_of_obj_containing_mark);
ysr@777	90	}
duke@435	91
duke@435	92	inline markOop markOopDesc::prototype_for_object(oop obj) {
duke@435	93	#ifdef ASSERT
duke@435	94	markOop prototype_header = obj->klass()->klass_part()->prototype_header();
duke@435	95	assert(prototype_header == prototype() || prototype_header->has_bias_pattern(), "corrupt prototype header");
duke@435	96	#endif
duke@435	97	return obj->klass()->klass_part()->prototype_header();
duke@435	98	}