1010N/A/*
1879N/A * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
1425N/A * Copyright 2007, 2008, 2010 Red Hat, Inc.
1010N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1010N/A *
1010N/A * This code is free software; you can redistribute it and/or modify it
1010N/A * under the terms of the GNU General Public License version 2 only, as
1010N/A * published by the Free Software Foundation.
1010N/A *
1010N/A * This code is distributed in the hope that it will be useful, but WITHOUT
1010N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1010N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1010N/A * version 2 for more details (a copy is included in the LICENSE file that
1010N/A * accompanied this code).
1010N/A *
1010N/A * You should have received a copy of the GNU General Public License version
1010N/A * 2 along with this work; if not, write to the Free Software Foundation,
1010N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1010N/A *
1472N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1472N/A * or visit www.oracle.com if you need additional information or have any
1472N/A * questions.
1010N/A *
1010N/A */
1010N/A
1879N/A#ifndef CPU_ZERO_VM_JAVAFRAMEANCHOR_ZERO_HPP
1879N/A#define CPU_ZERO_VM_JAVAFRAMEANCHOR_ZERO_HPP
1879N/A
1425N/A private:
1425N/A ZeroFrame* volatile _last_Java_fp;
1425N/A
1010N/A public:
1010N/A // Each arch must define reset, save, restore
1010N/A // These are used by objects that only care about:
1010N/A // 1 - initializing a new state (thread creation, javaCalls)
1010N/A // 2 - saving a current state (javaCalls)
1010N/A // 3 - restoring an old state (javaCalls)
1425N/A // Note that whenever _last_Java_sp != NULL other anchor fields
1425N/A // must be valid. The profiler apparently depends on this.
1010N/A
1010N/A void clear() {
1010N/A // clearing _last_Java_sp must be first
1010N/A _last_Java_sp = NULL;
1010N/A // fence?
1425N/A _last_Java_fp = NULL;
1010N/A _last_Java_pc = NULL;
1010N/A }
1010N/A
1010N/A void copy(JavaFrameAnchor* src) {
1425N/A set(src->_last_Java_sp, src->_last_Java_pc, src->_last_Java_fp);
1425N/A }
1425N/A
1425N/A void set(intptr_t* sp, address pc, ZeroFrame* fp) {
1010N/A // In order to make sure the transition state is valid for "this"
1010N/A // We must clear _last_Java_sp before copying the rest of the new
1010N/A // data
1010N/A //
1010N/A // Hack Alert: Temporary bugfix for 4717480/4721647 To act like
1010N/A // previous version (pd_cache_state) don't NULL _last_Java_sp
1010N/A // unless the value is changing
1010N/A //
1425N/A if (_last_Java_sp != sp)
1010N/A _last_Java_sp = NULL;
1010N/A
1425N/A _last_Java_fp = fp;
1425N/A _last_Java_pc = pc;
1010N/A // Must be last so profiler will always see valid frame if
1010N/A // has_last_frame() is true
1425N/A _last_Java_sp = sp;
1010N/A }
1010N/A
1010N/A bool walkable() {
1010N/A return true;
1010N/A }
1010N/A
1010N/A void make_walkable(JavaThread* thread) {
1010N/A // nothing to do
1010N/A }
1010N/A
1010N/A intptr_t* last_Java_sp() const {
1010N/A return _last_Java_sp;
1010N/A }
1010N/A
1425N/A ZeroFrame* last_Java_fp() const {
1425N/A return _last_Java_fp;
1010N/A }
1432N/A
1649N/A address last_Java_pc() const {
1649N/A return _last_Java_pc;
1649N/A }
1649N/A
1432N/A static ByteSize last_Java_fp_offset() {
1432N/A return byte_offset_of(JavaFrameAnchor, _last_Java_fp);
1432N/A }
1879N/A
1879N/A#endif // CPU_ZERO_VM_JAVAFRAMEANCHOR_ZERO_HPP