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annotate jvmci/jdk.internal.jvmci.hotspot/src/jdk/internal/jvmci/hotspot/HotSpotMemoryAccessProviderImpl.java @ 22054:0e095e2c24e2

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Rename com.oracle.jvmci to jdk.internal.jvmci
author twisti
date Mon, 22 Jun 2015 12:12:53 -0700
parents jvmci/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/HotSpotMemoryAccessProviderImpl.java@395ac43a8578
children 76af33d4d504
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1 /*
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2 * Copyright (c) 2011, 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 jdk.internal.jvmci.hotspot;
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24
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25 import static jdk.internal.jvmci.common.UnsafeAccess.*;
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26 import jdk.internal.jvmci.code.*;
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27 import jdk.internal.jvmci.common.*;
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28 import jdk.internal.jvmci.hotspot.HotSpotVMConfig.*;
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29 import jdk.internal.jvmci.meta.*;
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30
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31 /**
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32 * HotSpot implementation of {@link MemoryAccessProvider}.
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33 */
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34 public class HotSpotMemoryAccessProviderImpl implements HotSpotMemoryAccessProvider, HotSpotProxified {
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35
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36 protected final HotSpotJVMCIRuntimeProvider runtime;
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37
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38 public HotSpotMemoryAccessProviderImpl(HotSpotJVMCIRuntimeProvider runtime) {
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39 this.runtime = runtime;
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40 }
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41
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42 private static Object asObject(Constant base) {
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43 if (base instanceof HotSpotObjectConstantImpl) {
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44 return ((HotSpotObjectConstantImpl) base).object();
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45 } else {
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46 return null;
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47 }
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48 }
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49
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50 private boolean isValidObjectFieldDisplacement(Constant base, long displacement) {
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51 if (base instanceof HotSpotMetaspaceConstant) {
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52 Object metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base);
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53 if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) {
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54 if (displacement == runtime.getConfig().classMirrorOffset) {
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55 // Klass::_java_mirror is valid for all Klass* values
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56 return true;
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57 } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) {
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58 // ArrayKlass::_component_mirror is only valid for all ArrayKlass* values
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59 return ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().isArray();
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60 }
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61 } else {
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62 throw new JVMCIError("%s", metaspaceObject);
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63 }
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64 }
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65 return false;
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66 }
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67
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68 private static long asRawPointer(Constant base) {
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69 if (base instanceof HotSpotMetaspaceConstant) {
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70 return ((HotSpotMetaspaceConstant) base).rawValue();
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71 } else if (base instanceof PrimitiveConstant) {
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72 PrimitiveConstant prim = (PrimitiveConstant) base;
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73 if (prim.getKind().isNumericInteger()) {
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74 return prim.asLong();
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75 }
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76 }
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77 throw new JVMCIError("%s", base);
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78 }
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79
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80 private static long readRawValue(Constant baseConstant, long displacement, int bits) {
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81 Object base = asObject(baseConstant);
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82 if (base != null) {
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83 switch (bits) {
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84 case 8:
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85 return unsafe.getByte(base, displacement);
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86 case 16:
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87 return unsafe.getShort(base, displacement);
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88 case 32:
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89 return unsafe.getInt(base, displacement);
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90 case 64:
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91 return unsafe.getLong(base, displacement);
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92 default:
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93 throw new JVMCIError("%d", bits);
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94 }
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95 } else {
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96 long pointer = asRawPointer(baseConstant);
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97 switch (bits) {
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98 case 8:
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99 return unsafe.getByte(pointer + displacement);
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100 case 16:
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101 return unsafe.getShort(pointer + displacement);
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102 case 32:
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103 return unsafe.getInt(pointer + displacement);
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104 case 64:
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105 return unsafe.getLong(pointer + displacement);
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106 default:
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107 throw new JVMCIError("%d", bits);
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108 }
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109 }
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110 }
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111
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112 private boolean verifyReadRawObject(Object expected, Constant base, long displacement, boolean compressed) {
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113 if (compressed == runtime.getConfig().useCompressedOops) {
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114 Object obj = asObject(base);
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115 if (obj != null) {
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116 assert expected == unsafe.getObject(obj, displacement) : "readUnsafeOop doesn't agree with unsafe.getObject";
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117 }
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118 }
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119 if (base instanceof HotSpotMetaspaceConstant) {
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120 Object metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base);
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121 if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) {
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122 if (displacement == runtime.getConfig().classMirrorOffset) {
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123 assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror();
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124 } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) {
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125 assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().getComponentType();
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126 }
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127 }
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128 }
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129 return true;
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130 }
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131
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132 private Object readRawObject(Constant baseConstant, long initialDisplacement, boolean compressed) {
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133 long displacement = initialDisplacement;
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134
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135 Object ret;
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136 Object base = asObject(baseConstant);
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137 if (base == null) {
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138 assert !compressed;
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139 displacement += asRawPointer(baseConstant);
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140 ret = runtime.getCompilerToVM().readUncompressedOop(displacement);
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141 } else {
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142 assert runtime.getConfig().useCompressedOops == compressed;
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143 ret = unsafe.getObject(base, displacement);
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144 }
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145 assert verifyReadRawObject(ret, baseConstant, initialDisplacement, compressed);
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146 return ret;
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147 }
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148
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149 @Override
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150 public JavaConstant readUnsafeConstant(Kind kind, JavaConstant baseConstant, long displacement) {
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151 if (kind == Kind.Object) {
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152 Object o = readRawObject(baseConstant, displacement, runtime.getConfig().useCompressedOops);
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153 return HotSpotObjectConstantImpl.forObject(o);
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154 } else {
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155 return readPrimitiveConstant(kind, baseConstant, displacement, kind.getByteCount() * 8);
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156 }
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157 }
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158
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159 @Override
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160 public JavaConstant readPrimitiveConstant(Kind kind, Constant baseConstant, long initialDisplacement, int bits) {
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161 try {
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162 long rawValue = readRawValue(baseConstant, initialDisplacement, bits);
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163 switch (kind) {
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164 case Boolean:
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165 return JavaConstant.forBoolean(rawValue != 0);
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166 case Byte:
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167 return JavaConstant.forByte((byte) rawValue);
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168 case Char:
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169 return JavaConstant.forChar((char) rawValue);
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170 case Short:
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171 return JavaConstant.forShort((short) rawValue);
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172 case Int:
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173 return JavaConstant.forInt((int) rawValue);
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174 case Long:
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175 return JavaConstant.forLong(rawValue);
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176 case Float:
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177 return JavaConstant.forFloat(Float.intBitsToFloat((int) rawValue));
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178 case Double:
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179 return JavaConstant.forDouble(Double.longBitsToDouble(rawValue));
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180 default:
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181 throw new JVMCIError("Unsupported kind: %s", kind);
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182 }
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183 } catch (NullPointerException e) {
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184 return null;
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185 }
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186 }
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187
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188 @Override
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189 public JavaConstant readObjectConstant(Constant base, long displacement) {
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190 if (!isValidObjectFieldDisplacement(base, displacement)) {
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191 return null;
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192 }
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193 return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, false));
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194 }
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195
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196 @Override
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197 public JavaConstant readNarrowOopConstant(Constant base, long displacement, CompressEncoding encoding) {
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198 assert encoding.equals(runtime.getConfig().getOopEncoding()) : "unexpected oop encoding: " + encoding + " != " + runtime.getConfig().getOopEncoding();
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199 return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, true), true);
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200 }
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201
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202 @Override
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203 public Constant readKlassPointerConstant(Constant base, long displacement) {
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204 TargetDescription target = runtime.getHostJVMCIBackend().getCodeCache().getTarget();
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diff changeset
205 long klass = readRawValue(base, displacement, target.wordSize * 8);
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e04e41c3cb6e Handle null in readKlassPointer
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diff changeset
206 if (klass == 0) {
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207 return JavaConstant.NULL_POINTER;
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208 }
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209 HotSpotResolvedObjectType metaKlass = HotSpotResolvedObjectTypeImpl.fromMetaspaceKlass(klass);
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210 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(target.wordKind, klass, metaKlass, false);
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211 }
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212
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diff changeset
213 @Override
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diff changeset
214 public Constant readNarrowKlassPointerConstant(Constant base, long displacement, CompressEncoding encoding) {
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diff changeset
215 int compressed = (int) readRawValue(base, displacement, 32);
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diff changeset
216 long klass = encoding.uncompress(compressed);
18735
e04e41c3cb6e Handle null in readKlassPointer
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diff changeset
217 if (klass == 0) {
18779
7ea9a39bd7cc return proper kind of NULL
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diff changeset
218 return HotSpotCompressedNullConstant.COMPRESSED_NULL;
18735
e04e41c3cb6e Handle null in readKlassPointer
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diff changeset
219 }
18483
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diff changeset
220 HotSpotResolvedObjectType metaKlass = HotSpotResolvedObjectTypeImpl.fromMetaspaceKlass(klass);
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diff changeset
221 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(Kind.Int, compressed, metaKlass, true);
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diff changeset
222 }
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diff changeset
223
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diff changeset
224 @Override
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diff changeset
225 public Constant readMethodPointerConstant(Constant base, long displacement) {
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diff changeset
226 TargetDescription target = runtime.getHostJVMCIBackend().getCodeCache().getTarget();
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diff changeset
227 long method = readRawValue(base, displacement, target.wordSize * 8);
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diff changeset
228 HotSpotResolvedJavaMethod metaMethod = HotSpotResolvedJavaMethodImpl.fromMetaspace(method);
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diff changeset
229 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(target.wordKind, method, metaMethod, false);
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diff changeset
230 }
12429
5124eeec1a7b split HotSpotRuntime into separate provider implementations
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parents:
diff changeset
231 }