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src/cpu/zero/vm/javaFrameAnchor_zero.hpp@0c5b3cf3c1f5 (annotated)

src/cpu/zero/vm/javaFrameAnchor_zero.hpp

Fri, 30 Apr 2010 04:27:25 -0700

author

twisti

date

Fri, 30 Apr 2010 04:27:25 -0700

changeset 1860

0c5b3cf3c1f5

parent 1445

354d3184f6b2

child 1867

6cfbdb113e52

permissions

-rw-r--r--

6939182: Zero JNI handles fix
Summary: Zero will exit with an error when invoked with -Xcheck:jni.
Reviewed-by: twisti, kamg
Contributed-by: Gary Benson <gbenson@redhat.com>

never@1445	1	/*
never@1445	2	* Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
twisti@1860	3	* Copyright 2007, 2008, 2010 Red Hat, Inc.
never@1445	4	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@1445	5	*
never@1445	6	* This code is free software; you can redistribute it and/or modify it
never@1445	7	* under the terms of the GNU General Public License version 2 only, as
never@1445	8	* published by the Free Software Foundation.
never@1445	9	*
never@1445	10	* This code is distributed in the hope that it will be useful, but WITHOUT
never@1445	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@1445	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
never@1445	13	* version 2 for more details (a copy is included in the LICENSE file that
never@1445	14	* accompanied this code).
never@1445	15	*
never@1445	16	* You should have received a copy of the GNU General Public License version
never@1445	17	* 2 along with this work; if not, write to the Free Software Foundation,
never@1445	18	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@1445	19	*
never@1445	20	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
never@1445	21	* CA 95054 USA or visit www.sun.com if you need additional information or
never@1445	22	* have any questions.
never@1445	23	*
never@1445	24	*/
never@1445	25
twisti@1860	26	private:
twisti@1860	27	ZeroFrame* volatile _last_Java_fp;
twisti@1860	28
never@1445	29	public:
never@1445	30	// Each arch must define reset, save, restore
never@1445	31	// These are used by objects that only care about:
never@1445	32	// 1 - initializing a new state (thread creation, javaCalls)
never@1445	33	// 2 - saving a current state (javaCalls)
never@1445	34	// 3 - restoring an old state (javaCalls)
twisti@1860	35	// Note that whenever _last_Java_sp != NULL other anchor fields
twisti@1860	36	// must be valid. The profiler apparently depends on this.
never@1445	37
never@1445	38	void clear() {
never@1445	39	// clearing _last_Java_sp must be first
never@1445	40	_last_Java_sp = NULL;
never@1445	41	// fence?
twisti@1860	42	_last_Java_fp = NULL;
never@1445	43	_last_Java_pc = NULL;
never@1445	44	}
never@1445	45
never@1445	46	void copy(JavaFrameAnchor* src) {
twisti@1860	47	set(src->_last_Java_sp, src->_last_Java_pc, src->_last_Java_fp);
twisti@1860	48	}
twisti@1860	49
twisti@1860	50	void set(intptr_t* sp, address pc, ZeroFrame* fp) {
never@1445	51	// In order to make sure the transition state is valid for "this"
never@1445	52	// We must clear _last_Java_sp before copying the rest of the new
never@1445	53	// data
never@1445	54	//
never@1445	55	// Hack Alert: Temporary bugfix for 4717480/4721647 To act like
never@1445	56	// previous version (pd_cache_state) don't NULL _last_Java_sp
never@1445	57	// unless the value is changing
never@1445	58	//
twisti@1860	59	if (_last_Java_sp != sp)
never@1445	60	_last_Java_sp = NULL;
never@1445	61
twisti@1860	62	_last_Java_fp = fp;
twisti@1860	63	_last_Java_pc = pc;
never@1445	64	// Must be last so profiler will always see valid frame if
never@1445	65	// has_last_frame() is true
twisti@1860	66	_last_Java_sp = sp;
never@1445	67	}
never@1445	68
never@1445	69	bool walkable() {
never@1445	70	return true;
never@1445	71	}
never@1445	72
never@1445	73	void make_walkable(JavaThread* thread) {
never@1445	74	// nothing to do
never@1445	75	}
never@1445	76
never@1445	77	intptr_t* last_Java_sp() const {
never@1445	78	return _last_Java_sp;
never@1445	79	}
never@1445	80
twisti@1860	81	ZeroFrame* last_Java_fp() const {
twisti@1860	82	return _last_Java_fp;
never@1445	83	}