Mercurial > hg > graal-jvmci-8
view graal/com.oracle.max.cri/src/com/sun/cri/ci/CiValue.java @ 4182:de7b3e7ae528
Simplify CiValue
author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Mon, 02 Jan 2012 14:38:17 -0800 |
parents | f5328dda9714 |
children | 9e0c1b4cfef5 |
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/* * Copyright (c) 2009, 2012, 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.cri.ci; import java.io.*; /** * Abstract base class for values manipulated by the compiler. All values have a {@linkplain CiKind kind} and are immutable. */ public abstract class CiValue implements Serializable { private static final long serialVersionUID = -6909397188697766469L; @SuppressWarnings("serial") public static CiValue IllegalValue = new CiValue(CiKind.Illegal) { @Override public String toString() { return "-"; } @Override public CiRegister asRegister() { return CiRegister.None; } }; /** * The kind of this value. */ public final CiKind kind; /** * Initializes a new value of the specified kind. * @param kind the kind */ protected CiValue(CiKind kind) { this.kind = kind; } public final boolean isVariableOrRegister() { return this instanceof CiVariable || this instanceof CiRegisterValue; } public CiRegister asRegister() { throw new InternalError("Not a register: " + this); } public final boolean isIllegal() { return this == IllegalValue; } public final boolean isLegal() { return this != IllegalValue; } /** * Determines if this value represents a slot on a stack. These values are created * by the register allocator for spill slots. They are also used to model method * parameters passed on the stack according to a specific calling convention. */ public final boolean isStackSlot() { return this instanceof CiStackSlot; } public final boolean isRegister() { return this instanceof CiRegisterValue; } public final boolean isVariable() { return this instanceof CiVariable; } public final boolean isAddress() { return this instanceof CiAddress; } public final boolean isConstant() { return this instanceof CiConstant; } @Override public abstract String toString(); protected final String kindSuffix() { return "|" + kind.typeChar; } public final boolean isConstant0() { return isConstant() && ((CiConstant) this).asInt() == 0; } }