/*
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
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*/
#ifndef CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP
#define CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP
private:
volatile int _flags;
public:
enum pd_Constants {
flushed = 1 // winodows have flushed
};
int flags(void) { return _flags; }
void set_flags(int flags) { _flags = flags; }
static ByteSize flags_offset() { return byte_offset_of(JavaFrameAnchor, _flags); }
// Each arch must define clear, copy
// 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?
_flags = 0;
_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;
_flags = src->_flags;
_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;
}
// Is stack walkable
inline bool walkable( void) {
return _flags & flushed;
}
void make_walkable(JavaThread* thread);
void set_last_Java_sp(intptr_t* sp) { _last_Java_sp = sp; }
address last_Java_pc(void) { return _last_Java_pc; }
// These are only used by friends
private:
intptr_t* last_Java_sp() const {
// _last_Java_sp will always be a an unbiased stack pointer
// if is is biased then some setter screwed up. This is
// deadly.
#ifdef _LP64
assert(((intptr_t)_last_Java_sp & 0xF) == 0, "Biased last_Java_sp");
#endif
return _last_Java_sp;
}
void capture_last_Java_pc(intptr_t* sp);
void set_window_flushed( void) {
_flags |= flushed;
OrderAccess::fence();
}
#endif // CPU_SPARC_VM_JAVAFRAMEANCHOR_SPARC_HPP