Mercurial > hg > truffle
view graal/com.oracle.max.cri/src/com/sun/cri/ci/CiValue.java @ 4149:cf4de9cc1268
Integrated latest mxtool updates.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 20 Dec 2011 10:36:44 +0100 |
parents | bc8527f3071c |
children | f5328dda9714 |
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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.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 name() { return "<illegal>"; } @Override public CiRegister asRegister() { return CiRegister.None; } @Override public int hashCode() { return -1; } @Override public boolean equals(Object obj) { return obj == this; } @Override public boolean equalsIgnoringKind(CiValue other) { return other == this; } }; /** * 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; } /** * Gets a string name for this value without indicating its {@linkplain #kind kind}. */ public abstract String name(); @Override public abstract boolean equals(Object obj); public abstract boolean equalsIgnoringKind(CiValue other); @Override public abstract int hashCode(); @Override public final String toString() { return name() + kindSuffix(); } public final String kindSuffix() { if (kind == CiKind.Illegal) { return ""; } return ":" + kind.typeChar; } public final boolean isConstant0() { return isConstant() && ((CiConstant) this).asInt() == 0; } /** * Utility for specializing how a {@linkplain CiValue LIR operand} is formatted to a string. * The {@linkplain Formatter#DEFAULT default formatter} returns the value of * {@link CiValue#toString()}. */ public static class Formatter { public static final Formatter DEFAULT = new Formatter(); /** * Formats a given operand as a string. * * @param operand the operand to format * @return {@code operand} as a string */ public String format(CiValue operand) { return operand.toString(); } } }