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/*
* Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 2007, 2008, 2010 Red Hat, Inc.
* 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.
*
*/
private:
ZeroFrame* volatile _last_Java_fp;
public:
// Each arch must define reset, save, restore
// These are used by objects that only care about:
// 1 - initializing a new state (thread creation, javaCalls)
// 2 - saving a current state (javaCalls)
// 3 - restoring an old state (javaCalls)
// Note that whenever _last_Java_sp != NULL other anchor fields
// must be valid. The profiler apparently depends on this.
void clear() {
// clearing _last_Java_sp must be first
_last_Java_sp = NULL;
// fence?
_last_Java_fp = NULL;
_last_Java_pc = NULL;
}
void copy(JavaFrameAnchor* src) {
set(src->_last_Java_sp, src->_last_Java_pc, src->_last_Java_fp);
}
void set(intptr_t* sp, address pc, ZeroFrame* fp) {
// In order to make sure the transition state is valid for "this"
// We must clear _last_Java_sp before copying the rest of the new
// data
//
// Hack Alert: Temporary bugfix for 4717480/4721647 To act like
// previous version (pd_cache_state) don't NULL _last_Java_sp
// unless the value is changing
//
if (_last_Java_sp != sp)
_last_Java_sp = NULL;
_last_Java_fp = fp;
_last_Java_pc = pc;
// Must be last so profiler will always see valid frame if
// has_last_frame() is true
_last_Java_sp = sp;
}
bool walkable() {
return true;
}
void make_walkable(JavaThread* thread) {
// nothing to do
}
intptr_t* last_Java_sp() const {
return _last_Java_sp;
}
ZeroFrame* last_Java_fp() const {
return _last_Java_fp;
}
static ByteSize last_Java_fp_offset() {
return byte_offset_of(JavaFrameAnchor, _last_Java_fp);
}
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