80 lines
2.9 KiB
C++
80 lines
2.9 KiB
C++
/*
|
|
* Copyright 2002-2007 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.
|
|
*
|
|
*/
|
|
|
|
private:
|
|
|
|
// FP value associated with _last_Java_sp:
|
|
intptr_t* volatile _last_Java_fp; // pointer is volatile not what it points to
|
|
|
|
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)
|
|
|
|
void clear(void) {
|
|
// clearing _last_Java_sp must be first
|
|
_last_Java_sp = NULL;
|
|
// fence?
|
|
_last_Java_fp = NULL;
|
|
_last_Java_pc = NULL;
|
|
}
|
|
|
|
void copy(JavaFrameAnchor* src) {
|
|
// 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 != src->_last_Java_sp)
|
|
_last_Java_sp = NULL;
|
|
|
|
_last_Java_fp = src->_last_Java_fp;
|
|
_last_Java_pc = src->_last_Java_pc;
|
|
// Must be last so profiler will always see valid frame if has_last_frame() is true
|
|
_last_Java_sp = src->_last_Java_sp;
|
|
}
|
|
|
|
// Always walkable
|
|
bool walkable(void) { return true; }
|
|
// Never any thing to do since we are always walkable and can find address of return addresses
|
|
void make_walkable(JavaThread* thread) { }
|
|
|
|
intptr_t* last_Java_sp(void) const { return _last_Java_sp; }
|
|
|
|
private:
|
|
|
|
static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); }
|
|
|
|
public:
|
|
|
|
void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; }
|
|
|
|
intptr_t* last_Java_fp(void) { return _last_Java_fp; }
|
|
// Assert (last_Java_sp == NULL || fp == NULL)
|
|
void set_last_Java_fp(intptr_t* fp) { _last_Java_fp = fp; }
|