UserAccessorProperty.java revision 1036:f0b5e3900a10
1/* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package jdk.nashorn.internal.runtime; 27 28import static jdk.nashorn.internal.lookup.Lookup.MH; 29import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; 30import static jdk.nashorn.internal.runtime.JSType.CONVERT_OBJECT_OPTIMISTIC; 31import static jdk.nashorn.internal.runtime.JSType.getAccessorTypeIndex; 32import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; 33 34import java.lang.invoke.MethodHandle; 35import java.lang.invoke.MethodHandles; 36import java.lang.invoke.MethodType; 37import java.util.concurrent.Callable; 38import jdk.nashorn.internal.lookup.Lookup; 39import jdk.nashorn.internal.runtime.linker.Bootstrap; 40 41/** 42 * Property with user defined getters/setters. Actual getter and setter 43 * functions are stored in underlying ScriptObject. Only the 'slot' info is 44 * stored in the property. 45 */ 46public final class UserAccessorProperty extends SpillProperty { 47 48 private static final long serialVersionUID = -5928687246526840321L; 49 50 static final class Accessors { 51 Object getter; 52 Object setter; 53 54 Accessors(final Object getter, final Object setter) { 55 set(getter, setter); 56 } 57 58 final void set(final Object getter, final Object setter) { 59 this.getter = getter; 60 this.setter = setter; 61 } 62 63 @Override 64 public String toString() { 65 return "[getter=" + getter + " setter=" + setter + ']'; 66 } 67 } 68 69 private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup(); 70 71 /** Getter method handle */ 72 private final static MethodHandle INVOKE_GETTER_ACCESSOR = findOwnMH_S("invokeGetterAccessor", Object.class, Accessors.class, Object.class); 73 74 /** Setter method handle */ 75 private final static MethodHandle INVOKE_SETTER_ACCESSOR = findOwnMH_S("invokeSetterAccessor", void.class, Accessors.class, String.class, Object.class, Object.class); 76 77 /** Dynamic invoker for getter */ 78 private static final Object GETTER_INVOKER_KEY = new Object(); 79 80 private static MethodHandle getINVOKE_UA_GETTER() { 81 82 return Context.getGlobal().getDynamicInvoker(GETTER_INVOKER_KEY, 83 new Callable<MethodHandle>() { 84 @Override 85 public MethodHandle call() { 86 return Bootstrap.createDynamicInvoker("dyn:call", Object.class, 87 Object.class, Object.class); 88 } 89 }); 90 } 91 92 /** Dynamic invoker for setter */ 93 private static Object SETTER_INVOKER_KEY = new Object(); 94 95 private static MethodHandle getINVOKE_UA_SETTER() { 96 return Context.getGlobal().getDynamicInvoker(SETTER_INVOKER_KEY, 97 new Callable<MethodHandle>() { 98 @Override 99 public MethodHandle call() { 100 return Bootstrap.createDynamicInvoker("dyn:call", void.class, 101 Object.class, Object.class, Object.class); 102 } 103 }); 104 } 105 106 /** 107 * Constructor 108 * 109 * @param key property key 110 * @param flags property flags 111 * @param slot spill slot 112 */ 113 UserAccessorProperty(final String key, final int flags, final int slot) { 114 super(key, flags, slot); 115 } 116 117 private UserAccessorProperty(final UserAccessorProperty property) { 118 super(property); 119 } 120 121 private UserAccessorProperty(final UserAccessorProperty property, final Class<?> newType) { 122 super(property, newType); 123 } 124 125 @Override 126 public Property copy() { 127 return new UserAccessorProperty(this); 128 } 129 130 @Override 131 public Property copy(final Class<?> newType) { 132 return new UserAccessorProperty(this, newType); 133 } 134 135 void setAccessors(final ScriptObject sobj, final PropertyMap map, final Accessors gs) { 136 try { 137 //invoke the getter and find out 138 super.getSetter(Object.class, map).invokeExact((Object)sobj, (Object)gs); 139 } catch (final Error | RuntimeException t) { 140 throw t; 141 } catch (final Throwable t) { 142 throw new RuntimeException(t); 143 } 144 } 145 146 //pick the getter setter out of the correct spill slot in sobj 147 Accessors getAccessors(final ScriptObject sobj) { 148 try { 149 //invoke the super getter with this spill slot 150 //get the getter setter from the correct spill slot 151 final Object gs = super.getGetter(Object.class).invokeExact((Object)sobj); 152 return (Accessors)gs; 153 } catch (final Error | RuntimeException t) { 154 throw t; 155 } catch (final Throwable t) { 156 throw new RuntimeException(t); 157 } 158 } 159 160 @Override 161 public Class<?> getCurrentType() { 162 return Object.class; 163 } 164 165 @Override 166 public boolean hasGetterFunction(final ScriptObject sobj) { 167 return getAccessors(sobj).getter != null; 168 } 169 170 @Override 171 public boolean hasSetterFunction(final ScriptObject sobj) { 172 return getAccessors(sobj).setter != null; 173 } 174 175 @Override 176 public int getIntValue(final ScriptObject self, final ScriptObject owner) { 177 return (int)getObjectValue(self, owner); 178 } 179 180 @Override 181 public long getLongValue(final ScriptObject self, final ScriptObject owner) { 182 return (long)getObjectValue(self, owner); 183 } 184 185 @Override 186 public double getDoubleValue(final ScriptObject self, final ScriptObject owner) { 187 return (double)getObjectValue(self, owner); 188 } 189 190 @Override 191 public Object getObjectValue(final ScriptObject self, final ScriptObject owner) { 192 return invokeGetterAccessor(getAccessors((owner != null) ? owner : self), self); 193 } 194 195 @Override 196 public void setValue(final ScriptObject self, final ScriptObject owner, final int value, final boolean strict) { 197 setValue(self, owner, (Object) value, strict); 198 } 199 200 @Override 201 public void setValue(final ScriptObject self, final ScriptObject owner, final long value, final boolean strict) { 202 setValue(self, owner, (Object) value, strict); 203 } 204 205 @Override 206 public void setValue(final ScriptObject self, final ScriptObject owner, final double value, final boolean strict) { 207 setValue(self, owner, (Object) value, strict); 208 } 209 210 @Override 211 public void setValue(final ScriptObject self, final ScriptObject owner, final Object value, final boolean strict) { 212 invokeSetterAccessor(getAccessors((owner != null) ? owner : self), strict ? getKey() : null, self, value); 213 } 214 215 @Override 216 public MethodHandle getGetter(final Class<?> type) { 217 //this returns a getter on the format (Accessors, Object receiver) 218 return Lookup.filterReturnType(INVOKE_GETTER_ACCESSOR, type); 219 } 220 221 @Override 222 public MethodHandle getOptimisticGetter(final Class<?> type, final int programPoint) { 223 //fortype is always object, but in the optimistic world we have to throw 224 //unwarranted optimism exception for narrower types. We can improve this 225 //by checking for boxed types and unboxing them, but it is doubtful that 226 //this gives us any performance, as UserAccessorProperties are typically not 227 //primitives. Are there? TODO: investigate later. For now we just throw an 228 //exception for narrower types than object 229 230 if (type.isPrimitive()) { 231 final MethodHandle getter = getGetter(Object.class); 232 final MethodHandle mh = 233 MH.asType( 234 MH.filterReturnValue( 235 getter, 236 MH.insertArguments( 237 CONVERT_OBJECT_OPTIMISTIC.get(getAccessorTypeIndex(type)), 238 1, 239 programPoint)), 240 getter.type().changeReturnType(type)); 241 242 return mh; 243 } 244 245 assert type == Object.class; 246 return getGetter(type); 247 } 248 249 @Override 250 void initMethodHandles(final Class<?> structure) { 251 throw new UnsupportedOperationException(); 252 } 253 254 @Override 255 public ScriptFunction getGetterFunction(final ScriptObject sobj) { 256 final Object value = getAccessors(sobj).getter; 257 return (value instanceof ScriptFunction) ? (ScriptFunction)value : null; 258 } 259 260 @Override 261 public MethodHandle getSetter(final Class<?> type, final PropertyMap currentMap) { 262 return INVOKE_SETTER_ACCESSOR; 263 } 264 265 @Override 266 public ScriptFunction getSetterFunction(final ScriptObject sobj) { 267 final Object value = getAccessors(sobj).setter; 268 return (value instanceof ScriptFunction) ? (ScriptFunction)value : null; 269 } 270 271 /** 272 * Get the getter for the {@code Accessors} object. 273 * This is the the super {@code Object} type getter with {@code Accessors} return type. 274 * 275 * @return The getter handle for the Accessors 276 */ 277 MethodHandle getAccessorsGetter() { 278 return super.getGetter(Object.class).asType(MethodType.methodType(Accessors.class, Object.class)); 279 } 280 281 // User defined getter and setter are always called by "dyn:call". Note that the user 282 // getter/setter may be inherited. If so, proto is bound during lookup. In either 283 // inherited or self case, slot is also bound during lookup. Actual ScriptFunction 284 // to be called is retrieved everytime and applied. 285 private static Object invokeGetterAccessor(final Accessors gs, final Object self) { 286 final Object func = gs.getter; 287 if (func instanceof ScriptFunction) { 288 try { 289 return getINVOKE_UA_GETTER().invokeExact(func, self); 290 } catch (final Error | RuntimeException t) { 291 throw t; 292 } catch (final Throwable t) { 293 throw new RuntimeException(t); 294 } 295 } 296 297 return UNDEFINED; 298 } 299 300 private static void invokeSetterAccessor(final Accessors gs, final String name, final Object self, final Object value) { 301 final Object func = gs.setter; 302 if (func instanceof ScriptFunction) { 303 try { 304 getINVOKE_UA_SETTER().invokeExact(func, self, value); 305 } catch (final Error | RuntimeException t) { 306 throw t; 307 } catch (final Throwable t) { 308 throw new RuntimeException(t); 309 } 310 } else if (name != null) { 311 throw typeError("property.has.no.setter", name, ScriptRuntime.safeToString(self)); 312 } 313 } 314 315 private static MethodHandle findOwnMH_S(final String name, final Class<?> rtype, final Class<?>... types) { 316 return MH.findStatic(LOOKUP, UserAccessorProperty.class, name, MH.type(rtype, types)); 317 } 318 319} 320