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annotate graal/com.oracle.max.cri/src/com/sun/cri/ci/CiValue.java @ 4169:f5328dda9714

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Initial commit of SSA-based spill-all register assignment
author Christian Wimmer <Christian.Wimmer@Oracle.com>
date Wed, 28 Dec 2011 18:13:25 -0800
parents bc8527f3071c
children de7b3e7ae528
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1 /*
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.cri.ci;
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24
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25 import java.io.*;
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26
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27 /**
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28 * Abstract base class for values manipulated by the compiler. All values have a {@linkplain CiKind kind} and are immutable.
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29 */
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30 public abstract class CiValue implements Serializable {
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31 private static final long serialVersionUID = -6909397188697766469L;
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32
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33 @SuppressWarnings("serial")
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34 public static CiValue IllegalValue = new CiValue(CiKind.Illegal) {
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35 @Override
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36 public String toString() {
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37 return "-";
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38 }
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39 @Override
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40 public CiRegister asRegister() {
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41 return CiRegister.None;
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42 }
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43 };
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44
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45 /**
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46 * The kind of this value.
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47 */
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48 public final CiKind kind;
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49
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50 /**
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51 * Initializes a new value of the specified kind.
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52 * @param kind the kind
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53 */
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54 protected CiValue(CiKind kind) {
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55 this.kind = kind;
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56 }
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57
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58 public final boolean isVariableOrRegister() {
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59 return this instanceof CiVariable || this instanceof CiRegisterValue;
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60 }
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61
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62 public CiRegister asRegister() {
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63 throw new InternalError("Not a register: " + this);
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64 }
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65
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66 public final boolean isIllegal() {
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67 return this == IllegalValue;
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68 }
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69
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70 public final boolean isLegal() {
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71 return this != IllegalValue;
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72 }
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73
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74 /**
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75 * Determines if this value represents a slot on a stack. These values are created
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76 * by the register allocator for spill slots. They are also used to model method
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77 * parameters passed on the stack according to a specific calling convention.
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78 */
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79 public final boolean isStackSlot() {
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80 return this instanceof CiStackSlot;
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81 }
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82
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83 public final boolean isRegister() {
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84 return this instanceof CiRegisterValue;
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85 }
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86
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87 public final boolean isVariable() {
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88 return this instanceof CiVariable;
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89 }
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90
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91 public final boolean isAddress() {
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92 return this instanceof CiAddress;
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93 }
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94
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95 public final boolean isConstant() {
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96 return this instanceof CiConstant;
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97 }
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98
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99 public boolean equalsIgnoringKind(CiValue other) {
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100 // This is a suitable default implementation for several subclasses
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101 return equals(other);
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102 }
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103
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104 @Override
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105 public abstract String toString();
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106
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107 protected final String kindSuffix() {
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108 return "|" + kind.typeChar;
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109 }
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110
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111 public final boolean isConstant0() {
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112 return isConstant() && ((CiConstant) this).asInt() == 0;
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113 }
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114 }