Mercurial > hg > graal-jvmci-8
view graal/GraalCompiler/src/com/sun/c1x/ir/StateSplit.java @ 2611:bd235cb4375a
FrameState cleanup: split into FrameStateBuilder and fixed-size FrameState, removed MutableFrameState
author | Lukas Stadler <lukas.stadler@jku.at> |
---|---|
date | Fri, 06 May 2011 17:08:00 +0200 |
parents | 39aa89baa165 |
children | 3558ca7088c0 |
line wrap: on
line source
/* * 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.oracle.graal.graph.*; 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. */ public abstract class StateSplit extends Instruction { private static final int INPUT_COUNT = 0; private static final int SUCCESSOR_COUNT = 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 * @param inputCount * @param successorCount * @param graph */ public StateSplit(CiKind kind, FrameState stateBefore, int inputCount, int successorCount, Graph graph) { super(kind, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph); 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; } }