Mercurial > hg > graal-compiler

annotate graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/type/StampFactory.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
parents
children bc8527f3071c
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3733
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1 /*
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2 * Copyright (c) 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.oracle.max.graal.nodes.type;
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24
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25 import java.util.*;
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26
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27 import com.sun.cri.ci.*;
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28 import com.sun.cri.ri.*;
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29
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30
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31 public class StampFactory {
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32
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33 private static class BasicValueStamp implements Stamp {
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34
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35 private final CiKind kind;
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36 private final boolean nonNull;
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37 private RiResolvedType declaredType;
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38 private RiResolvedType exactType;
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39
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40 public BasicValueStamp(CiKind kind) {
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41 this(kind, false, null, null);
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42 }
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43
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44 public BasicValueStamp(CiKind kind, boolean nonNull, RiResolvedType declaredType, RiResolvedType exactType) {
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45 this.kind = kind;
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46 this.nonNull = nonNull;
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47 this.declaredType = declaredType;
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48 this.exactType = exactType;
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49 }
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50
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51 @Override
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52 public CiKind kind() {
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53 return kind;
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54 }
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55
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56 @Override
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57 public boolean nonNull() {
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58 return nonNull;
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59 }
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60
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61 @Override
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62 public RiResolvedType declaredType() {
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63 return declaredType;
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64 }
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65
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66 @Override
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67 public RiResolvedType exactType() {
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68 return exactType;
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69 }
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70
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71 @Override
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72 public boolean equals(Object obj) {
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73 if (obj == this) {
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74 return true;
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75 }
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76 if (obj instanceof Stamp) {
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77 Stamp other = (Stamp) obj;
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78 return kind == other.kind() && nonNull() == other.nonNull() && declaredType() == other.declaredType() && exactType() == other.exactType();
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79 }
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80 return false;
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81 }
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82
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83 @Override
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84 public String toString() {
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85 return String.format("%c%s %s %s", kind().typeChar, nonNull ? "!" : "", declaredType == null ? "-" : declaredType.name(), exactType == null ? "-" : exactType.name());
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86 }
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87
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88 @Override
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89 public boolean alwaysDistinct(Stamp other) {
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90 if (other.kind() != kind()) {
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91 return true;
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92 } else if (kind() != CiKind.Object) {
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93 return false;
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94 } else if (other.declaredType() == null || declaredType() == null) {
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95 // We have no type information for one of the values.
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96 return false;
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97 } else if (other.nonNull() || nonNull()) {
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98 // One of the two values cannot be null.
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99 return !other.declaredType().isSubtypeOf(declaredType()) && !declaredType().isSubtypeOf(other.declaredType());
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100 } else {
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101 // Both values may be null.
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102 return false;
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103 }
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104 }
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105 }
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106
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107 private static final Stamp[] stampCache = new Stamp[CiKind.values().length];
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108 static {
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109 for (CiKind k : CiKind.values()) {
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110 stampCache[k.ordinal()] = new BasicValueStamp(k);
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111 }
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112 }
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113
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114 public static Stamp illegal() {
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115 return forKind(CiKind.Illegal);
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116 }
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117
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118 public static Stamp intValue() {
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119 return forKind(CiKind.Int);
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120 }
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121
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122 public static Stamp forKind(CiKind kind) {
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123 return stampCache[kind.stackKind().ordinal()];
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124 }
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125
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126 public static Stamp exactNonNull(final RiResolvedType type) {
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127 // (cwi) type can be null for certain Maxine-internal objects such as the static hub. Is this a problem here?
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128 assert type == null || type.kind(false) == CiKind.Object;
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129 return new BasicValueStamp(CiKind.Object, true, type, type);
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130 }
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131
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132 public static Stamp forConstant(CiConstant value, RiRuntime runtime) {
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133 if (runtime != null && value.kind == CiKind.Object && !value.isNull()) {
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134 return exactNonNull(runtime.getTypeOf(value));
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135 } else {
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136 return forKind(value.kind.stackKind());
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137 }
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138 }
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139
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140 public static Stamp objectNonNull() {
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141 return new BasicValueStamp(CiKind.Object, true, null, null);
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142 }
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143
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144 public static Stamp declared(final RiResolvedType type) {
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145 assert type != null;
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146 assert type.kind(false) == CiKind.Object;
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147 return new BasicValueStamp(CiKind.Object, false, type, type.exactType());
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148 }
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149
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150 public static Stamp declaredNonNull(final RiResolvedType type) {
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151 assert type != null;
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152 assert type.kind(false) == CiKind.Object;
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153 return new BasicValueStamp(CiKind.Object, true, type, type.exactType());
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154 }
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155
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156 public static Stamp or(Collection<? extends StampProvider> values) {
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157 if (values.size() == 0) {
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158 return illegal();
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159 } else {
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160 Iterator< ? extends StampProvider> iterator = values.iterator();
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161 Stamp first = iterator.next().stamp();
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162 if (values.size() == 1) {
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163 return first;
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164 }
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165
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166 boolean nonNull = first.nonNull();
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167 RiResolvedType declaredType = first.declaredType();
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168 RiResolvedType exactType = first.exactType();
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169 while (iterator.hasNext()) {
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170 Stamp current = iterator.next().stamp();
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171 assert current.kind() == first.kind() : values + " first=" + first + " current=" + current;
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172 nonNull &= current.nonNull();
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173 declaredType = orTypes(declaredType, current.declaredType());
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174 exactType = orTypes(exactType, current.exactType());
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175 }
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176
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177 if (nonNull != first.nonNull() || declaredType != first.declaredType() || exactType != first.exactType()) {
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178 return new BasicValueStamp(first.kind(), nonNull, declaredType, exactType);
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179 } else {
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180 return first;
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181 }
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182 }
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183 }
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184
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185 private static RiResolvedType orTypes(RiResolvedType a, RiResolvedType b) {
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186 if (a == b) {
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187 return a;
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188 } else if (a == null || b == null) {
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189 return null;
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190 } else {
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191 if (a.isSubtypeOf(b)) {
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192 return b;
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193 } else if (b.isSubtypeOf(a)) {
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194 return a;
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195 } else {
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196 return null;
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197 }
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198 }
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199 }
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200 }