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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMemoryAccessProviderImpl.java @ 23360:73ceb487b9ca

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MemoryAccessProvider.readUnsafeConstant javadoc should be updated for null JavaKind case (JDK-8155244)
author Doug Simon <doug.simon@oracle.com>
date Thu, 28 Apr 2016 13:29:40 +0200
parents 67c84a8b19cc
children dafcbf1bb9cd
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
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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.hotspot.HotSpotVMConfig.CompressEncoding;
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27 import jdk.vm.ci.meta.Constant;
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28 import jdk.vm.ci.meta.JavaConstant;
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29 import jdk.vm.ci.meta.JavaKind;
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30 import jdk.vm.ci.meta.MemoryAccessProvider;
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31 import jdk.vm.ci.meta.PrimitiveConstant;
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32
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33 /**
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34 * HotSpot implementation of {@link MemoryAccessProvider}.
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35 */
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36 class HotSpotMemoryAccessProviderImpl implements HotSpotMemoryAccessProvider, HotSpotProxified {
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37
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38 protected final HotSpotJVMCIRuntimeProvider runtime;
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39
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40 HotSpotMemoryAccessProviderImpl(HotSpotJVMCIRuntimeProvider runtime) {
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41 this.runtime = runtime;
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42 }
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43
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44 private static Object asObject(Constant base) {
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45 if (base instanceof HotSpotObjectConstantImpl) {
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46 return ((HotSpotObjectConstantImpl) base).object();
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47 } else {
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48 return null;
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49 }
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50 }
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51
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52 private boolean isValidObjectFieldDisplacement(Constant base, long displacement) {
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53 if (base instanceof HotSpotMetaspaceConstant) {
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54 MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base);
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55 if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) {
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56 if (displacement == runtime.getConfig().classMirrorOffset) {
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57 // Klass::_java_mirror is valid for all Klass* values
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58 return true;
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59 } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) {
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60 // ArrayKlass::_component_mirror is only valid for all ArrayKlass* values
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61 return ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().isArray();
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62 }
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63 } else {
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64 throw new IllegalArgumentException(String.valueOf(metaspaceObject));
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65 }
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66 }
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67 return false;
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68 }
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69
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70 private static long asRawPointer(Constant base) {
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71 if (base instanceof HotSpotMetaspaceConstantImpl) {
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72 MetaspaceWrapperObject meta = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base);
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73 return meta.getMetaspacePointer();
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74 } else if (base instanceof PrimitiveConstant) {
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75 PrimitiveConstant prim = (PrimitiveConstant) base;
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76 if (prim.getJavaKind().isNumericInteger()) {
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77 return prim.asLong();
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78 }
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79 }
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80 throw new IllegalArgumentException(String.valueOf(base));
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81 }
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82
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83 private static long readRawValue(Constant baseConstant, long displacement, int bits) {
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84 Object base = asObject(baseConstant);
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85 if (base != null) {
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86 switch (bits) {
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87 case Byte.SIZE:
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88 return UNSAFE.getByte(base, displacement);
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89 case Short.SIZE:
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90 return UNSAFE.getShort(base, displacement);
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91 case Integer.SIZE:
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92 return UNSAFE.getInt(base, displacement);
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93 case Long.SIZE:
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94 return UNSAFE.getLong(base, displacement);
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95 default:
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96 throw new IllegalArgumentException(String.valueOf(bits));
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97 }
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98 } else {
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99 long pointer = asRawPointer(baseConstant);
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100 switch (bits) {
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101 case Byte.SIZE:
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102 return UNSAFE.getByte(pointer + displacement);
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103 case Short.SIZE:
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104 return UNSAFE.getShort(pointer + displacement);
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105 case Integer.SIZE:
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106 return UNSAFE.getInt(pointer + displacement);
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107 case Long.SIZE:
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108 return UNSAFE.getLong(pointer + displacement);
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109 default:
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110 throw new IllegalArgumentException(String.valueOf(bits));
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111 }
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112 }
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113 }
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114
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115 private boolean verifyReadRawObject(Object expected, Constant base, long displacement, boolean compressed) {
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116 if (compressed == runtime.getConfig().useCompressedOops) {
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117 Object obj = asObject(base);
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118 if (obj != null) {
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119 assert expected == UNSAFE.getObject(obj, displacement) : "readUnsafeOop doesn't agree with unsafe.getObject";
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120 }
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121 }
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122 if (base instanceof HotSpotMetaspaceConstant) {
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123 MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base);
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124 if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) {
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125 if (displacement == runtime.getConfig().classMirrorOffset) {
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126 assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror();
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127 } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) {
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128 assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().getComponentType();
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129 }
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130 }
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131 }
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132 return true;
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133 }
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134
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diff changeset
135 private Object readRawObject(Constant baseConstant, long initialDisplacement, boolean compressed) {
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136 long displacement = initialDisplacement;
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137
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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 Object ret;
18719
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139 Object base = asObject(baseConstant);
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diff changeset
140 if (base == null) {
20176
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
diff changeset
141 assert !compressed;
18719
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142 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
Doug Simon <doug.simon@oracle.com>
parents: 19772
diff changeset
143 ret = runtime.getCompilerToVM().readUncompressedOop(displacement);
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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144 } else {
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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145 assert runtime.getConfig().useCompressedOops == compressed;
22542
15579668ec3a renamed constant field to UNSAFE
Doug Simon <doug.simon@oracle.com>
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146 ret = UNSAFE.getObject(base, displacement);
15023
652564fe42d5 Use CompressionNode for accessing compressed Klass pointers.
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147 }
18719
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diff changeset
148 assert verifyReadRawObject(ret, baseConstant, initialDisplacement, compressed);
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149 return ret;
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150 }
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151
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152 @Override
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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153 public JavaConstant readUnsafeConstant(JavaKind kind, JavaConstant baseConstant, long displacement) {
23360
73ceb487b9ca MemoryAccessProvider.readUnsafeConstant javadoc should be updated for null JavaKind case (JDK-8155244)
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parents: 23341
diff changeset
154 if (kind == null) {
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parents: 23341
diff changeset
155 throw new IllegalArgumentException();
73ceb487b9ca MemoryAccessProvider.readUnsafeConstant javadoc should be updated for null JavaKind case (JDK-8155244)
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parents: 23341
diff changeset
156 }
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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diff changeset
157 if (kind == JavaKind.Object) {
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158 Object o = readRawObject(baseConstant, displacement, runtime.getConfig().useCompressedOops);
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159 return HotSpotObjectConstantImpl.forObject(o);
15023
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diff changeset
160 } else {
23322
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
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diff changeset
161 int bits = kind.getByteCount() * Byte.SIZE;
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
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diff changeset
162 return readPrimitiveConstant(kind, baseConstant, displacement, bits);
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163 }
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164 }
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165
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diff changeset
166 @Override
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dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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diff changeset
167 public JavaConstant readPrimitiveConstant(JavaKind kind, Constant baseConstant, long initialDisplacement, int bits) {
18359
a3a2359ac88e Support constant folding of pointer reads.
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diff changeset
168 try {
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169 long rawValue = readRawValue(baseConstant, initialDisplacement, bits);
15023
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diff changeset
170 switch (kind) {
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171 case Boolean:
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172 return JavaConstant.forBoolean(rawValue != 0);
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173 case Byte:
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174 return JavaConstant.forByte((byte) rawValue);
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175 case Char:
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176 return JavaConstant.forChar((char) rawValue);
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177 case Short:
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178 return JavaConstant.forShort((short) rawValue);
15023
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diff changeset
179 case Int:
18187
9619ba4daf4c Rename Constant to JavaConstant.
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diff changeset
180 return JavaConstant.forInt((int) rawValue);
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diff changeset
181 case Long:
18187
9619ba4daf4c Rename Constant to JavaConstant.
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diff changeset
182 return JavaConstant.forLong(rawValue);
15023
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diff changeset
183 case Float:
18187
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diff changeset
184 return JavaConstant.forFloat(Float.intBitsToFloat((int) rawValue));
15023
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diff changeset
185 case Double:
18187
9619ba4daf4c Rename Constant to JavaConstant.
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parents: 18176
diff changeset
186 return JavaConstant.forDouble(Double.longBitsToDouble(rawValue));
15023
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diff changeset
187 default:
23341
67c84a8b19cc fixed javadoc and implementation of MemoryAccessProvider methods to only throw IllegalArgumentException (JDK-8152024)
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parents: 23322
diff changeset
188 throw new IllegalArgumentException("Unsupported kind: " + kind);
15023
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189 }
18359
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diff changeset
190 } catch (NullPointerException e) {
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diff changeset
191 return null;
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diff changeset
192 }
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diff changeset
193 }
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diff changeset
194
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d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
195 @Override
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diff changeset
196 public JavaConstant readObjectConstant(Constant base, long displacement) {
19772
94d87f6324a3 ensure an offset into a HotSpot metaspace object is valid before reading it
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diff changeset
197 if (!isValidObjectFieldDisplacement(base, displacement)) {
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diff changeset
198 return null;
94d87f6324a3 ensure an offset into a HotSpot metaspace object is valid before reading it
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parents: 19412
diff changeset
199 }
18483
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
200 return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, false));
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
201 }
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
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diff changeset
202
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
203 @Override
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
204 public JavaConstant readNarrowOopConstant(Constant base, long displacement, CompressEncoding encoding) {
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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parents: 18482
diff changeset
205 assert encoding.equals(runtime.getConfig().getOopEncoding()) : "unexpected oop encoding: " + encoding + " != " + runtime.getConfig().getOopEncoding();
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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parents: 18482
diff changeset
206 return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, true), true);
18359
a3a2359ac88e Support constant folding of pointer reads.
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diff changeset
207 }
a3a2359ac88e Support constant folding of pointer reads.
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diff changeset
208
22454
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
209 private HotSpotResolvedObjectTypeImpl readKlass(Constant base, long displacement, boolean compressed) {
76af33d4d504 Make jvmci redefinition safe
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parents: 22054
diff changeset
210 assert (base instanceof HotSpotMetaspaceConstantImpl) || (base instanceof HotSpotObjectConstantImpl) : base.getClass();
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
211 Object baseObject = (base instanceof HotSpotMetaspaceConstantImpl) ? ((HotSpotMetaspaceConstantImpl) base).asResolvedJavaType() : ((HotSpotObjectConstantImpl) base).object();
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
212 return runtime.getCompilerToVM().getResolvedJavaType(baseObject, displacement, compressed);
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
213 }
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
214
18483
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
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diff changeset
215 @Override
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
216 public Constant readKlassPointerConstant(Constant base, long displacement) {
22454
76af33d4d504 Make jvmci redefinition safe
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parents: 22054
diff changeset
217 HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, false);
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
218 if (klass == null) {
18735
e04e41c3cb6e Handle null in readKlassPointer
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 18719
diff changeset
219 return JavaConstant.NULL_POINTER;
e04e41c3cb6e Handle null in readKlassPointer
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 18719
diff changeset
220 }
22590
3f6488b29c1a Remove rawValue from HotSpotMetaspaceConstantImpl, patch raw pointer at code installation time.
Roland Schatz <roland.schatz@oracle.com>
parents: 22556
diff changeset
221 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, false);
18483
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
222 }
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
223
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
224 @Override
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
225 public Constant readNarrowKlassPointerConstant(Constant base, long displacement, CompressEncoding encoding) {
22454
76af33d4d504 Make jvmci redefinition safe
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parents: 22054
diff changeset
226 HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, true);
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
227 if (klass == null) {
18779
7ea9a39bd7cc return proper kind of NULL
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 18735
diff changeset
228 return HotSpotCompressedNullConstant.COMPRESSED_NULL;
18735
e04e41c3cb6e Handle null in readKlassPointer
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 18719
diff changeset
229 }
22590
3f6488b29c1a Remove rawValue from HotSpotMetaspaceConstantImpl, patch raw pointer at code installation time.
Roland Schatz <roland.schatz@oracle.com>
parents: 22556
diff changeset
230 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, true);
18483
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
231 }
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
232
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
233 @Override
d7cc487d1325 Move HotSpot specific functionality to new subinterface of ConstantReflectionProvider.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
234 public Constant readMethodPointerConstant(Constant base, long displacement) {
22454
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
235 assert (base instanceof HotSpotObjectConstantImpl);
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
236 Object baseObject = ((HotSpotObjectConstantImpl) base).object();
76af33d4d504 Make jvmci redefinition safe
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 22054
diff changeset
237 HotSpotResolvedJavaMethodImpl method = runtime.getCompilerToVM().getResolvedJavaMethod(baseObject, displacement);
22590
3f6488b29c1a Remove rawValue from HotSpotMetaspaceConstantImpl, patch raw pointer at code installation time.
Roland Schatz <roland.schatz@oracle.com>
parents: 22556
diff changeset
238 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(method, false);
15023
652564fe42d5 Use CompressionNode for accessing compressed Klass pointers.
Roland Schatz <roland.schatz@oracle.com>
parents: 15018
diff changeset
239 }
23322
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
240
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
241 @Override
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
242 public Constant readSymbolConstant(Constant base, long displacement) {
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
243 int bits = runtime.getConfig().symbolPointerSize * Byte.SIZE;
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
244 long pointer = readRawValue(base, displacement, bits);
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
245 if (pointer == 0) {
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
246 return JavaConstant.NULL_POINTER;
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
247 } else {
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
248 String symbol = runtime.getCompilerToVM().getSymbol(pointer);
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
249 return new HotSpotSymbol(symbol, pointer).asConstant();
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
250 }
f8178417d018 Expose SharedRuntime::throw_and_post_jvmti_exception to JVMCI compilers.
Roland Schatz <roland.schatz@oracle.com>
parents: 23297
diff changeset
251 }
12429
5124eeec1a7b split HotSpotRuntime into separate provider implementations
Doug Simon <doug.simon@oracle.com>
parents:
diff changeset
252 }