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src/share/vm/oops/typeArrayKlassKlass.cpp@e1162778c1c8 (annotated)

src/share/vm/oops/typeArrayKlassKlass.cpp

Thu, 07 Apr 2011 09:53:20 -0700

author

johnc

date

Thu, 07 Apr 2011 09:53:20 -0700

changeset 2781

e1162778c1c8

parent 2314

f95d63e2154a

permissions

-rw-r--r--

7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes

duke@435	1	/*
stefank@2314	2	* Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#include "classfile/javaClasses.hpp"
stefank@2314	27	#include "oops/oop.inline.hpp"
stefank@2314	28	#include "oops/typeArrayKlassKlass.hpp"
stefank@2314	29	#include "runtime/handles.inline.hpp"
duke@435	30
duke@435	31	klassOop typeArrayKlassKlass::create_klass(TRAPS) {
duke@435	32	typeArrayKlassKlass o;
duke@435	33	KlassHandle h_this_klass(THREAD, Universe::klassKlassObj());
duke@435	34	KlassHandle k = base_create_klass(h_this_klass, header_size(), o.vtbl_value(), CHECK_NULL);
duke@435	35	assert(k()->size() == align_object_size(header_size()), "wrong size for object");
duke@435	36	java_lang_Class::create_mirror(k, CHECK_NULL); // Allocate mirror
duke@435	37	return k();
duke@435	38	}
duke@435	39
duke@435	40
duke@435	41	#ifndef PRODUCT
duke@435	42
duke@435	43	// Printing
duke@435	44
duke@435	45	void typeArrayKlassKlass::oop_print_on(oop obj, outputStream* st) {
duke@435	46	assert(obj->is_klass(), "must be klass");
duke@435	47	oop_print_value_on(obj, st);
duke@435	48	Klass:: oop_print_on(obj, st);
duke@435	49	}
duke@435	50
jrose@1590	51	#endif //PRODUCT
duke@435	52
duke@435	53	void typeArrayKlassKlass::oop_print_value_on(oop obj, outputStream* st) {
duke@435	54	assert(obj->is_klass(), "must be klass");
duke@435	55	st->print("{type array ");
duke@435	56	switch (typeArrayKlass::cast(klassOop(obj))->element_type()) {
duke@435	57	case T_BOOLEAN: st->print("bool"); break;
duke@435	58	case T_CHAR: st->print("char"); break;
duke@435	59	case T_FLOAT: st->print("float"); break;
duke@435	60	case T_DOUBLE: st->print("double"); break;
duke@435	61	case T_BYTE: st->print("byte"); break;
duke@435	62	case T_SHORT: st->print("short"); break;
duke@435	63	case T_INT: st->print("int"); break;
duke@435	64	case T_LONG: st->print("long"); break;
duke@435	65	default: ShouldNotReachHere();
duke@435	66	}
duke@435	67	st->print("}");
duke@435	68	}
duke@435	69
duke@435	70	const char* typeArrayKlassKlass::internal_name() const {
duke@435	71	return "{type array class}";
duke@435	72	}