Mercurial > hg > truffle
view src/cpu/zero/vm/javaFrameAnchor_zero.hpp @ 5424:068cc464e0cf
add snapshot() call in MergeNode.removeEnd to fix concurrent modification problem
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 22 May 2012 14:57:01 +0200 |
parents | f95d63e2154a |
children |
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/* * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef CPU_ZERO_VM_JAVAFRAMEANCHOR_ZERO_HPP #define CPU_ZERO_VM_JAVAFRAMEANCHOR_ZERO_HPP 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; } address last_Java_pc() const { return _last_Java_pc; } static ByteSize last_Java_fp_offset() { return byte_offset_of(JavaFrameAnchor, _last_Java_fp); } #endif // CPU_ZERO_VM_JAVAFRAMEANCHOR_ZERO_HPP