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 26 package jdk.nashorn.internal.runtime.arrays; 27 28 import static jdk.nashorn.internal.codegen.CompilerConstants.specialCall; 29 import java.lang.invoke.MethodHandle; 30 import java.lang.invoke.MethodHandles; 31 import java.util.Arrays; 32 import jdk.nashorn.internal.runtime.JSType; 33 import jdk.nashorn.internal.runtime.ScriptRuntime; 34 35 /** 36 * Implementation of {@link ArrayData} as soon as an Object has been 37 * written to the array 38 */ 39 final class ObjectArrayData extends ContinuousArrayData implements AnyElements { 40 41 /** 42 * The wrapped array 43 */ 44 private Object[] array; 45 46 /** 47 * Constructor 48 * @param array an int array 49 * @param length a length, not necessarily array.length 50 */ 51 ObjectArrayData(final Object[] array, final int length) { 52 super(length); 53 assert array.length >= length; 54 this.array = array; 55 } 56 57 @Override 58 public final Class<?> getElementType() { 59 return Object.class; 60 } 61 62 @Override 63 public final Class<?> getBoxedElementType() { 64 return getElementType(); 65 } 66 67 @Override 68 public final int getElementWeight() { 69 return 4; 70 } 71 72 @Override 73 public final ContinuousArrayData widest(final ContinuousArrayData otherData) { 74 return otherData instanceof NumericElements ? this : otherData; 75 } 76 77 @Override 78 public ObjectArrayData copy() { 79 return new ObjectArrayData(array.clone(), (int)length()); 80 } 81 82 @Override 83 public Object[] asObjectArray() { 84 return array.length == length() ? array.clone() : asObjectArrayCopy(); 85 } 86 87 private Object[] asObjectArrayCopy() { 88 final long len = length(); 89 assert len <= Integer.MAX_VALUE; 90 final Object[] copy = new Object[(int)len]; 91 System.arraycopy(array, 0, copy, 0, (int)len); 92 return copy; 93 } 94 95 @Override 96 public ObjectArrayData convert(final Class<?> type) { 97 return this; 98 } 99 100 @Override 101 public void shiftLeft(final int by) { 102 System.arraycopy(array, by, array, 0, array.length - by); 103 } 104 105 @Override 106 public ArrayData shiftRight(final int by) { 107 final ArrayData newData = ensure(by + length() - 1); 108 if (newData != this) { 109 newData.shiftRight(by); 110 return newData; 111 } 112 System.arraycopy(array, 0, array, by, array.length - by); 113 return this; 114 } 115 116 @Override 117 public ArrayData ensure(final long safeIndex) { 118 if (safeIndex >= SparseArrayData.MAX_DENSE_LENGTH) { 119 return new SparseArrayData(this, safeIndex + 1); 120 } 121 final int alen = array.length; 122 if (safeIndex >= alen) { 123 final int newLength = ArrayData.nextSize((int)safeIndex); 124 array = Arrays.copyOf(array, newLength); //fill with undefined or OK? TODO 125 } 126 if (safeIndex >= length()) { 127 setLength(safeIndex + 1); 128 } 129 return this; 130 } 131 132 @Override 133 public ArrayData shrink(final long newLength) { 134 Arrays.fill(array, (int) newLength, array.length, ScriptRuntime.UNDEFINED); 135 return this; 136 } 137 138 @Override 139 public ArrayData set(final int index, final Object value, final boolean strict) { 140 array[index] = value; 141 setLength(Math.max(index + 1, length())); 142 return this; 143 } 144 145 @Override 146 public ArrayData set(final int index, final int value, final boolean strict) { 147 array[index] = value; 148 setLength(Math.max(index + 1, length())); 149 return this; 150 } 151 152 @Override 153 public ArrayData set(final int index, final double value, final boolean strict) { 154 array[index] = value; 155 setLength(Math.max(index + 1, length())); 156 return this; 157 } 158 159 @Override 160 public ArrayData setEmpty(final int index) { 161 array[index] = ScriptRuntime.EMPTY; 162 return this; 163 } 164 165 @Override 166 public ArrayData setEmpty(final long lo, final long hi) { 167 // hi parameter is inclusive, but Arrays.fill toIndex parameter is exclusive 168 Arrays.fill(array, (int)Math.max(lo, 0L), (int)Math.min(hi + 1, Integer.MAX_VALUE), ScriptRuntime.EMPTY); 169 return this; 170 } 171 172 private static final MethodHandle HAS_GET_ELEM = specialCall(MethodHandles.lookup(), ObjectArrayData.class, "getElem", Object.class, int.class).methodHandle(); 173 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), ObjectArrayData.class, "setElem", void.class, int.class, Object.class).methodHandle(); 174 175 @SuppressWarnings("unused") 176 private Object getElem(final int index) { 177 if (has(index)) { 178 return array[index]; 179 } 180 throw new ClassCastException(); 181 } 182 183 @SuppressWarnings("unused") 184 private void setElem(final int index, final Object elem) { 185 if (hasRoomFor(index)) { 186 array[index] = elem; 187 return; 188 } 189 throw new ClassCastException(); 190 } 191 192 @Override 193 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) { 194 if (returnType.isPrimitive()) { 195 return null; 196 } 197 return getContinuousElementGetter(HAS_GET_ELEM, returnType, programPoint); 198 } 199 200 @Override 201 public MethodHandle getElementSetter(final Class<?> elementType) { 202 return getContinuousElementSetter(SET_ELEM, Object.class); 203 } 204 205 206 @Override 207 public int getInt(final int index) { 208 return JSType.toInt32(array[index]); 209 } 210 211 @Override 212 public double getDouble(final int index) { 213 return JSType.toNumber(array[index]); 214 } 215 216 @Override 217 public Object getObject(final int index) { 218 return array[index]; 219 } 220 221 @Override 222 public boolean has(final int index) { 223 return 0 <= index && index < length(); 224 } 225 226 @Override 227 public ArrayData delete(final int index) { 228 setEmpty(index); 229 return new DeletedRangeArrayFilter(this, index, index); 230 } 231 232 @Override 233 public ArrayData delete(final long fromIndex, final long toIndex) { 234 setEmpty(fromIndex, toIndex); 235 return new DeletedRangeArrayFilter(this, fromIndex, toIndex); 236 } 237 238 @Override 239 public long fastPush(final int arg) { 240 return fastPush((Object)arg); 241 } 242 243 @Override 244 public long fastPush(final long arg) { 245 return fastPush((Object)arg); 246 } 247 248 @Override 249 public long fastPush(final double arg) { 250 return fastPush((Object)arg); 251 } 252 253 @Override 254 public long fastPush(final Object arg) { 255 final int len = (int)length(); 256 if (len == array.length) { 257 array = Arrays.copyOf(array, nextSize(len)); 258 } 259 array[len] = arg; 260 return increaseLength(); 261 } 262 263 @Override 264 public Object fastPopObject() { 265 if (length() == 0) { 266 return ScriptRuntime.UNDEFINED; 267 } 268 final int newLength = (int)decreaseLength(); 269 final Object elem = array[newLength]; 270 array[newLength] = ScriptRuntime.EMPTY; 271 return elem; 272 } 273 274 @Override 275 public Object pop() { 276 if (length() == 0) { 277 return ScriptRuntime.UNDEFINED; 278 } 279 280 final int newLength = (int)length() - 1; 281 final Object elem = array[newLength]; 282 setEmpty(newLength); 283 setLength(newLength); 284 return elem; 285 } 286 287 @Override 288 public ArrayData slice(final long from, final long to) { 289 final long start = from < 0 ? from + length() : from; 290 final long newLength = to - start; 291 return new ObjectArrayData(Arrays.copyOfRange(array, (int)from, (int)to), (int)newLength); 292 } 293 294 @Override 295 public ArrayData push(final boolean strict, final Object item) { 296 final long len = length(); 297 final ArrayData newData = ensure(len); 298 if (newData == this) { 299 array[(int)len] = item; 300 return this; 301 } 302 return newData.set((int)len, item, strict); 303 } 304 305 @Override 306 public ArrayData fastSplice(final int start, final int removed, final int added) throws UnsupportedOperationException { 307 final long oldLength = length(); 308 final long newLength = oldLength - removed + added; 309 if (newLength > SparseArrayData.MAX_DENSE_LENGTH && newLength > array.length) { 310 throw new UnsupportedOperationException(); 311 } 312 final ArrayData returnValue = removed == 0 ? 313 EMPTY_ARRAY : new ObjectArrayData(Arrays.copyOfRange(array, start, start + removed), removed); 314 315 if (newLength != oldLength) { 316 final Object[] newArray; 317 318 if (newLength > array.length) { 319 newArray = new Object[ArrayData.nextSize((int)newLength)]; 320 System.arraycopy(array, 0, newArray, 0, start); 321 } else { 322 newArray = array; 323 } 324 325 System.arraycopy(array, start + removed, newArray, start + added, (int)(oldLength - start - removed)); 326 array = newArray; 327 setLength(newLength); 328 } 329 330 return returnValue; 331 } 332 333 @Override 334 public ContinuousArrayData fastConcat(final ContinuousArrayData otherData) { 335 final int otherLength = (int)otherData.length(); 336 final int thisLength = (int)length(); 337 assert otherLength > 0 && thisLength > 0; 338 339 final Object[] otherArray = ((ObjectArrayData)otherData).array; 340 final int newLength = otherLength + thisLength; 341 final Object[] newArray = new Object[ArrayData.alignUp(newLength)]; 342 343 System.arraycopy(array, 0, newArray, 0, thisLength); 344 System.arraycopy(otherArray, 0, newArray, thisLength, otherLength); 345 346 return new ObjectArrayData(newArray, newLength); 347 } 348 349 @Override 350 public String toString() { 351 assert length() <= array.length : length() + " > " + array.length; 352 return getClass().getSimpleName() + ':' + Arrays.toString(Arrays.copyOf(array, (int)length())); 353 } 354 }