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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMemoryAccessProviderImpl.java @ 23985:05922ce51c5e

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Restore extra level of weakness in the ResolvedJavaType cache
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Mon, 23 Jan 2017 15:50:05 -0800
parents 66059526b021
children 8abcd8e1285d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2011, 2016, 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
5124eeec1a7b split HotSpotRuntime into separate provider implementations
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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.vm.ci.hotspot;
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24
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25 import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE;
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26 import jdk.vm.ci.meta.Constant;
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27 import jdk.vm.ci.meta.JavaConstant;
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28 import jdk.vm.ci.meta.JavaKind;
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29 import jdk.vm.ci.meta.MemoryAccessProvider;
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30 import jdk.vm.ci.meta.PrimitiveConstant;
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31
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32 /**
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33 * HotSpot implementation of {@link MemoryAccessProvider}.
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34 */
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35 class HotSpotMemoryAccessProviderImpl implements HotSpotMemoryAccessProvider {
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36
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37 protected final HotSpotJVMCIRuntimeProvider runtime;
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38
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39 HotSpotMemoryAccessProviderImpl(HotSpotJVMCIRuntimeProvider runtime) {
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40 this.runtime = runtime;
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41 }
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42
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43 private static Object asObject(Constant base) {
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44 if (base instanceof HotSpotObjectConstantImpl) {
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45 return ((HotSpotObjectConstantImpl) base).object();
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46 } else {
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47 return null;
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48 }
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49 }
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50
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51 private boolean isValidObjectFieldDisplacement(Constant base, long displacement) {
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52 if (base instanceof HotSpotMetaspaceConstant) {
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53 MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base);
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54 if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) {
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55 if (displacement == runtime.getConfig().classMirrorOffset) {
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56 // Klass::_java_mirror is valid for all Klass* values
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57 return true;
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58 } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) {
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59 // ArrayKlass::_component_mirror is only valid for all ArrayKlass* values
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60 return ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().isArray();
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61 }
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62 } else {
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63 throw new IllegalArgumentException(String.valueOf(metaspaceObject));
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64 }
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65 }
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66 return false;
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67 }
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68
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69 private static long asRawPointer(Constant base) {
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70 if (base instanceof HotSpotMetaspaceConstantImpl) {
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71 MetaspaceWrapperObject meta = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base);
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72 return meta.getMetaspacePointer();
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73 } else if (base instanceof PrimitiveConstant) {
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74 PrimitiveConstant prim = (PrimitiveConstant) base;
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75 if (prim.getJavaKind().isNumericInteger()) {
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76 return prim.asLong();
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77 }
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78 }
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79 throw new IllegalArgumentException(String.valueOf(base));
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80 }
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81
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82 private static long readRawValue(Constant baseConstant, long displacement, int bits) {
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83 Object base = asObject(baseConstant);
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84 if (base != null) {
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85 switch (bits) {
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86 case Byte.SIZE:
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87 return UNSAFE.getByte(base, displacement);
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88 case Short.SIZE:
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89 return UNSAFE.getShort(base, displacement);
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90 case Integer.SIZE:
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91 return UNSAFE.getInt(base, displacement);
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92 case Long.SIZE:
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93 return UNSAFE.getLong(base, displacement);
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94 default:
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95 throw new IllegalArgumentException(String.valueOf(bits));
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96 }
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97 } else {
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98 long pointer = asRawPointer(baseConstant);
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99 switch (bits) {
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100 case Byte.SIZE:
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101 return UNSAFE.getByte(pointer + displacement);
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102 case Short.SIZE:
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103 return UNSAFE.getShort(pointer + displacement);
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104 case Integer.SIZE:
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105 return UNSAFE.getInt(pointer + displacement);
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106 case Long.SIZE:
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107 return UNSAFE.getLong(pointer + displacement);
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108 default:
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109 throw new IllegalArgumentException(String.valueOf(bits));
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110 }
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111 }
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112 }
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113
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114 private boolean verifyReadRawObject(Object expected, Constant base, long displacement) {
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115 if (base instanceof HotSpotMetaspaceConstant) {
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116 MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base);
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117 if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) {
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118 if (displacement == runtime.getConfig().classMirrorOffset) {
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119 assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror();
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120 } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) {
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121 assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().getComponentType();
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122 }
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123 }
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124 }
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125 return true;
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126 }
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127
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128 private Object readRawObject(Constant baseConstant, long initialDisplacement, boolean compressed) {
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129 long displacement = initialDisplacement;
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130
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03b4fa99eff8 rename CompilerToVM.readUnsafeOop to readUncompressedOop and only use it for reading oops in VM data structures since Unsafe.getObject() can be used for other cases
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131 Object ret;
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132 Object base = asObject(baseConstant);
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133 if (base == null) {
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03b4fa99eff8 rename CompilerToVM.readUnsafeOop to readUncompressedOop and only use it for reading oops in VM data structures since Unsafe.getObject() can be used for other cases
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134 assert !compressed;
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135 displacement += asRawPointer(baseConstant);
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03b4fa99eff8 rename CompilerToVM.readUnsafeOop to readUncompressedOop and only use it for reading oops in VM data structures since Unsafe.getObject() can be used for other cases
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parents: 19772
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136 ret = runtime.getCompilerToVM().readUncompressedOop(displacement);
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137 assert verifyReadRawObject(ret, baseConstant, initialDisplacement);
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03b4fa99eff8 rename CompilerToVM.readUnsafeOop to readUncompressedOop and only use it for reading oops in VM data structures since Unsafe.getObject() can be used for other cases
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138 } else {
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139 assert runtime.getConfig().useCompressedOops == compressed;
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15579668ec3a renamed constant field to UNSAFE
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140 ret = UNSAFE.getObject(base, displacement);
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141 }
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142 return ret;
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143 }
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144
23401
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145 /**
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146 * Reads a value of this kind using a base address and a displacement. No bounds checking or
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147 * type checking is performed. Returns {@code null} if the value is not available at this point.
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148 *
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149 * @param baseConstant the base address from which the value is read.
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150 * @param displacement the displacement within the object in bytes
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151 * @return the read value encapsulated in a {@link JavaConstant} object, or {@code null} if the
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152 * value cannot be read.
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153 * @throws IllegalArgumentException if {@code kind} is {@code null}, {@link JavaKind#Void}, not
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154 * {@link JavaKind#Object} or not {@linkplain JavaKind#isPrimitive() primitive} kind
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155 */
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156 JavaConstant readUnsafeConstant(JavaKind kind, JavaConstant baseConstant, long displacement) {
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73ceb487b9ca MemoryAccessProvider.readUnsafeConstant javadoc should be updated for null JavaKind case (JDK-8155244)
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157 if (kind == null) {
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158 throw new IllegalArgumentException("null JavaKind");
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159 }
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dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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160 if (kind == JavaKind.Object) {
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161 Object o = readRawObject(baseConstant, displacement, runtime.getConfig().useCompressedOops);
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162 return HotSpotObjectConstantImpl.forObject(o);
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163 } else {
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f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
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164 int bits = kind.getByteCount() * Byte.SIZE;
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165 return readPrimitiveConstant(kind, baseConstant, displacement, bits);
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166 }
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167 }
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168
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169 @Override
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170 public JavaConstant readPrimitiveConstant(JavaKind kind, Constant baseConstant, long initialDisplacement, int bits) {
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171 try {
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172 long rawValue = readRawValue(baseConstant, initialDisplacement, bits);
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173 switch (kind) {
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174 case Boolean:
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175 return JavaConstant.forBoolean(rawValue != 0);
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176 case Byte:
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177 return JavaConstant.forByte((byte) rawValue);
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178 case Char:
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179 return JavaConstant.forChar((char) rawValue);
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180 case Short:
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181 return JavaConstant.forShort((short) rawValue);
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182 case Int:
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183 return JavaConstant.forInt((int) rawValue);
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184 case Long:
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185 return JavaConstant.forLong(rawValue);
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186 case Float:
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187 return JavaConstant.forFloat(Float.intBitsToFloat((int) rawValue));
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188 case Double:
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189 return JavaConstant.forDouble(Double.longBitsToDouble(rawValue));
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190 default:
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67c84a8b19cc fixed javadoc and implementation of MemoryAccessProvider methods to only throw IllegalArgumentException (JDK-8152024)
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191 throw new IllegalArgumentException("Unsupported kind: " + kind);
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192 }
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193 } catch (NullPointerException e) {
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194 return null;
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195 }
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196 }
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197
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198 @Override
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199 public JavaConstant readObjectConstant(Constant base, long displacement) {
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dafcbf1bb9cd HotSpotMemoryAccessProviderImpl.readObjectConstant should support reading fields in objects (JDK-8155626)
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diff changeset
200 if (base instanceof HotSpotObjectConstantImpl) {
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diff changeset
201 Object o = readRawObject(base, displacement, runtime.getConfig().useCompressedOops);
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202 return HotSpotObjectConstantImpl.forObject(o);
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diff changeset
203 }
23400
0cbc2bd101c3 revert incorrect assertion and correct javadoc around MemoryAccessProvider.readObjectConstant
Doug Simon <doug.simon@oracle.com>
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diff changeset
204 if (!isValidObjectFieldDisplacement(base, displacement)) {
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diff changeset
205 return null;
0cbc2bd101c3 revert incorrect assertion and correct javadoc around MemoryAccessProvider.readObjectConstant
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diff changeset
206 }
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diff changeset
207 return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, false));
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diff changeset
208 }
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209
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diff changeset
210 @Override
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b5557b757040 fix HotSpotVMConfig startup performance (JDK-8159167)
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diff changeset
211 public JavaConstant readNarrowOopConstant(Constant base, long displacement) {
18483
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
212 return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, true), true);
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213 }
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diff changeset
214
22454
76af33d4d504 Make jvmci redefinition safe
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parents: 22054
diff changeset
215 private HotSpotResolvedObjectTypeImpl readKlass(Constant base, long displacement, boolean compressed) {
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diff changeset
216 assert (base instanceof HotSpotMetaspaceConstantImpl) || (base instanceof HotSpotObjectConstantImpl) : base.getClass();
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diff changeset
217 Object baseObject = (base instanceof HotSpotMetaspaceConstantImpl) ? ((HotSpotMetaspaceConstantImpl) base).asResolvedJavaType() : ((HotSpotObjectConstantImpl) base).object();
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diff changeset
218 return runtime.getCompilerToVM().getResolvedJavaType(baseObject, displacement, compressed);
76af33d4d504 Make jvmci redefinition safe
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diff changeset
219 }
76af33d4d504 Make jvmci redefinition safe
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parents: 22054
diff changeset
220
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diff changeset
221 @Override
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diff changeset
222 public Constant readKlassPointerConstant(Constant base, long displacement) {
22454
76af33d4d504 Make jvmci redefinition safe
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diff changeset
223 HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, false);
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parents: 22054
diff changeset
224 if (klass == null) {
18735
e04e41c3cb6e Handle null in readKlassPointer
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diff changeset
225 return JavaConstant.NULL_POINTER;
e04e41c3cb6e Handle null in readKlassPointer
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diff changeset
226 }
22590
3f6488b29c1a Remove rawValue from HotSpotMetaspaceConstantImpl, patch raw pointer at code installation time.
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diff changeset
227 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, false);
18483
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
228 }
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diff changeset
229
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diff changeset
230 @Override
23679
b5557b757040 fix HotSpotVMConfig startup performance (JDK-8159167)
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parents: 23401
diff changeset
231 public Constant readNarrowKlassPointerConstant(Constant base, long displacement) {
22454
76af33d4d504 Make jvmci redefinition safe
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parents: 22054
diff changeset
232 HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, true);
76af33d4d504 Make jvmci redefinition safe
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diff changeset
233 if (klass == null) {
18779
7ea9a39bd7cc return proper kind of NULL
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 18735
diff changeset
234 return HotSpotCompressedNullConstant.COMPRESSED_NULL;
18735
e04e41c3cb6e Handle null in readKlassPointer
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diff changeset
235 }
22590
3f6488b29c1a Remove rawValue from HotSpotMetaspaceConstantImpl, patch raw pointer at code installation time.
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diff changeset
236 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, true);
18483
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
237 }
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diff changeset
238
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
239 @Override
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diff changeset
240 public Constant readMethodPointerConstant(Constant base, long displacement) {
22454
76af33d4d504 Make jvmci redefinition safe
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parents: 22054
diff changeset
241 assert (base instanceof HotSpotObjectConstantImpl);
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diff changeset
242 Object baseObject = ((HotSpotObjectConstantImpl) base).object();
76af33d4d504 Make jvmci redefinition safe
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parents: 22054
diff changeset
243 HotSpotResolvedJavaMethodImpl method = runtime.getCompilerToVM().getResolvedJavaMethod(baseObject, displacement);
22590
3f6488b29c1a Remove rawValue from HotSpotMetaspaceConstantImpl, patch raw pointer at code installation time.
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parents: 22556
diff changeset
244 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(method, false);
15023
652564fe42d5 Use CompressionNode for accessing compressed Klass pointers.
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parents: 15018
diff changeset
245 }
12429
5124eeec1a7b split HotSpotRuntime into separate provider implementations
Doug Simon <doug.simon@oracle.com>
parents:
diff changeset
246 }