Mercurial > hg > graal-jvmci-8
view graal/GraalCompiler/src/com/sun/c1x/ir/StateSplit.java @ 2587:51ebe5f0516f
changed NegateOp, more Op2 changes (generic inputValuesDo impl)
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Thu, 05 May 2011 15:01:34 +0200 |
parents | cc1f1d396288 |
children | fec99fc30af1 |
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/* * Copyright (c) 2009, 2011, 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. */ package com.sun.c1x.ir; import com.sun.c1x.value.*; import com.sun.cri.ci.*; /** * The {@code StateSplit} class is the abstract base class of all instructions * that store an immutable copy of the frame state. * * @author Ben L. Titzer */ public abstract class StateSplit extends Instruction { /** * Sentinel denoting an explicitly cleared state. */ private static final FrameState CLEARED_STATE = new MutableFrameState(-5, 0, 0); private FrameState stateBefore; /** * Creates a new state split with the specified value type. * @param kind the type of the value that this instruction produces */ public StateSplit(CiKind kind, FrameState stateBefore) { super(kind); this.stateBefore = stateBefore; } @Override public boolean canTrap() { return stateBefore != null; } /** * Records the state of this instruction before it is executed. * * @param stateBefore the state */ public final void setStateBefore(FrameState stateBefore) { assert this.stateBefore == null; this.stateBefore = stateBefore; } /** * Gets the state for this instruction. * @return the state */ @Override public final FrameState stateBefore() { return stateBefore; } }