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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/type/KlassPointerStamp.java @ 21526:1da7aef31a08

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created com.oracle.graal.hotspot.jvmci package and moved classes destined for future JVMCI module into it (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Tue, 19 May 2015 23:16:07 +0200
parents 7ea471ed17e4
children 93c50cefb9e8
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1 /*
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2 * Copyright (c) 2014, 2015, 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.graal.hotspot.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.oracle.graal.api.meta.*;
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28 import com.oracle.graal.compiler.common.spi.*;
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29 import com.oracle.graal.compiler.common.type.*;
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30 import com.oracle.graal.hotspot.jvmci.*;
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31 import com.oracle.graal.hotspot.jvmci.HotSpotVMConfig.*;
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32
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33 public final class KlassPointerStamp extends MetaspacePointerStamp {
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34
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35 private static final KlassPointerStamp KLASS = new KlassPointerStamp(false, false);
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36
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37 private static final KlassPointerStamp KLASS_NON_NULL = new KlassPointerStamp(true, false);
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38
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39 private static final KlassPointerStamp KLASS_ALWAYS_NULL = new KlassPointerStamp(false, true);
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40
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41 private final CompressEncoding encoding;
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42
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43 public static KlassPointerStamp klass() {
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44 return KLASS;
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45 }
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46
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47 public static KlassPointerStamp klassNonNull() {
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48 return KLASS_NON_NULL;
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49 }
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50
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51 private KlassPointerStamp(boolean nonNull, boolean alwaysNull) {
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52 this(nonNull, alwaysNull, null);
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53 }
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54
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55 private KlassPointerStamp(boolean nonNull, boolean alwaysNull, CompressEncoding encoding) {
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56 super(nonNull, alwaysNull);
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57 this.encoding = encoding;
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58 }
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59
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60 @Override
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61 protected AbstractPointerStamp copyWith(boolean newNonNull, boolean newAlwaysNull) {
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62 return new KlassPointerStamp(newNonNull, newAlwaysNull, encoding);
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63 }
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64
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65 @Override
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66 public boolean isCompatible(Stamp otherStamp) {
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67 if (this == otherStamp) {
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68 return true;
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69 }
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70 if (otherStamp instanceof KlassPointerStamp) {
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71 KlassPointerStamp other = (KlassPointerStamp) otherStamp;
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72 return Objects.equals(this.encoding, other.encoding);
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73 }
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74 return false;
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75 }
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76
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77 @Override
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78 public Stamp constant(Constant c, MetaAccessProvider meta) {
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79 if (isCompressed()) {
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80 if (HotSpotCompressedNullConstant.COMPRESSED_NULL.equals(c)) {
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81 return new KlassPointerStamp(false, true, encoding);
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82 }
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83 } else {
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84 if (JavaConstant.NULL_POINTER.equals(c)) {
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85 return KLASS_ALWAYS_NULL;
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86 }
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87 }
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88
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89 assert c instanceof HotSpotMetaspaceConstant;
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90 if (nonNull()) {
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91 return this;
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92 }
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93 if (isCompressed()) {
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94 return new KlassPointerStamp(true, false, encoding);
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95 } else {
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96 return KLASS_NON_NULL;
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97 }
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98 }
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99
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100 @Override
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101 public Constant asConstant() {
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102 if (alwaysNull() && isCompressed()) {
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103 return HotSpotCompressedNullConstant.COMPRESSED_NULL;
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104 } else {
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105 return super.asConstant();
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106 }
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107 }
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108
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109 @Override
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110 public LIRKind getLIRKind(LIRKindTool tool) {
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111 if (isCompressed()) {
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112 return LIRKind.value(Kind.Int);
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113 } else {
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114 return super.getLIRKind(tool);
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115 }
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116 }
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117
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118 public boolean isCompressed() {
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119 return encoding != null;
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120 }
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121
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122 public CompressEncoding getEncoding() {
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123 return encoding;
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124 }
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125
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126 public KlassPointerStamp compressed(CompressEncoding newEncoding) {
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127 assert !isCompressed();
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128 return new KlassPointerStamp(nonNull(), alwaysNull(), newEncoding);
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129 }
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130
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131 public KlassPointerStamp uncompressed() {
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132 assert isCompressed();
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133 return new KlassPointerStamp(nonNull(), alwaysNull());
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134 }
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135
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136 @Override
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137 public Constant readConstant(MemoryAccessProvider provider, Constant base, long displacement) {
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138 HotSpotMemoryAccessProvider hsProvider = (HotSpotMemoryAccessProvider) provider;
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139 if (isCompressed()) {
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140 return hsProvider.readNarrowKlassPointerConstant(base, displacement, encoding);
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141 } else {
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142 return hsProvider.readKlassPointerConstant(base, displacement);
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143 }
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144 }
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145
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146 @Override
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147 public int hashCode() {
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148 final int prime = 31;
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149 int result = super.hashCode();
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150 result = prime * result + ((encoding == null) ? 0 : encoding.hashCode());
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151 return result;
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152 }
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153
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154 @Override
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155 public boolean equals(Object obj) {
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156 if (this == obj) {
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157 return true;
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158 }
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159 if (!super.equals(obj)) {
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160 return false;
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161 }
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162 if (!(obj instanceof KlassPointerStamp)) {
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163 return false;
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164 }
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165 KlassPointerStamp other = (KlassPointerStamp) obj;
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166 return Objects.equals(this.encoding, other.encoding);
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167 }
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168
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169 @Override
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170 public String toString() {
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171 StringBuilder ret = new StringBuilder("Klass*");
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172 appendString(ret);
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173 if (isCompressed()) {
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174 ret.append("(compressed ").append(encoding).append(")");
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175 }
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176 return ret.toString();
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177 }
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178 }