JSType.java revision 1645:15d52fdd9168
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.codegen.CompilerConstants.staticCall; 29import static jdk.nashorn.internal.lookup.Lookup.MH; 30import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; 31 32import java.lang.invoke.MethodHandle; 33import java.lang.invoke.MethodHandles; 34import java.lang.reflect.Array; 35import java.util.Arrays; 36import java.util.Collections; 37import java.util.List; 38import jdk.dynalink.SecureLookupSupplier; 39import jdk.dynalink.beans.StaticClass; 40import jdk.nashorn.api.scripting.JSObject; 41import jdk.nashorn.internal.codegen.CompilerConstants.Call; 42import jdk.nashorn.internal.codegen.types.Type; 43import jdk.nashorn.internal.objects.Global; 44import jdk.nashorn.internal.objects.NativeSymbol; 45import jdk.nashorn.internal.parser.Lexer; 46import jdk.nashorn.internal.runtime.arrays.ArrayLikeIterator; 47import jdk.nashorn.internal.runtime.doubleconv.DoubleConversion; 48import jdk.nashorn.internal.runtime.linker.Bootstrap; 49 50/** 51 * Representation for ECMAScript types - this maps directly to the ECMA script standard 52 */ 53public enum JSType { 54 /** The undefined type */ 55 UNDEFINED("undefined"), 56 57 /** The null type */ 58 NULL("object"), 59 60 /** The boolean type */ 61 BOOLEAN("boolean"), 62 63 /** The number type */ 64 NUMBER("number"), 65 66 /** The string type */ 67 STRING("string"), 68 69 /** The object type */ 70 OBJECT("object"), 71 72 /** The function type */ 73 FUNCTION("function"), 74 75 /** The symbol type */ 76 SYMBOL("symbol"); 77 78 /** The type name as returned by ECMAScript "typeof" operator*/ 79 private final String typeName; 80 81 /** Max value for an uint32 in JavaScript */ 82 public static final long MAX_UINT = 0xFFFF_FFFFL; 83 84 private static final MethodHandles.Lookup JSTYPE_LOOKUP = MethodHandles.lookup(); 85 86 /** JavaScript compliant conversion function from Object to boolean */ 87 public static final Call TO_BOOLEAN = staticCall(JSTYPE_LOOKUP, JSType.class, "toBoolean", boolean.class, Object.class); 88 89 /** JavaScript compliant conversion function from number to boolean */ 90 public static final Call TO_BOOLEAN_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toBoolean", boolean.class, double.class); 91 92 /** JavaScript compliant conversion function from Object to integer */ 93 public static final Call TO_INTEGER = staticCall(JSTYPE_LOOKUP, JSType.class, "toInteger", int.class, Object.class); 94 95 /** JavaScript compliant conversion function from Object to long */ 96 public static final Call TO_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "toLong", long.class, Object.class); 97 98 /** JavaScript compliant conversion function from double to long */ 99 public static final Call TO_LONG_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toLong", long.class, double.class); 100 101 /** JavaScript compliant conversion function from Object to number */ 102 public static final Call TO_NUMBER = staticCall(JSTYPE_LOOKUP, JSType.class, "toNumber", double.class, Object.class); 103 104 /** JavaScript compliant conversion function from Object to number with type check */ 105 public static final Call TO_NUMBER_OPTIMISTIC = staticCall(JSTYPE_LOOKUP, JSType.class, "toNumberOptimistic", double.class, Object.class, int.class); 106 107 /** JavaScript compliant conversion function from Object to String */ 108 public static final Call TO_STRING = staticCall(JSTYPE_LOOKUP, JSType.class, "toString", String.class, Object.class); 109 110 /** JavaScript compliant conversion function from Object to int32 */ 111 public static final Call TO_INT32 = staticCall(JSTYPE_LOOKUP, JSType.class, "toInt32", int.class, Object.class); 112 113 /** JavaScript compliant conversion function from Object to int32 */ 114 public static final Call TO_INT32_L = staticCall(JSTYPE_LOOKUP, JSType.class, "toInt32", int.class, long.class); 115 116 /** JavaScript compliant conversion function from Object to int32 with type check */ 117 public static final Call TO_INT32_OPTIMISTIC = staticCall(JSTYPE_LOOKUP, JSType.class, "toInt32Optimistic", int.class, Object.class, int.class); 118 119 /** JavaScript compliant conversion function from double to int32 */ 120 public static final Call TO_INT32_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toInt32", int.class, double.class); 121 122 /** JavaScript compliant conversion function from int to uint32 */ 123 public static final Call TO_UINT32_OPTIMISTIC = staticCall(JSTYPE_LOOKUP, JSType.class, "toUint32Optimistic", int.class, int.class, int.class); 124 125 /** JavaScript compliant conversion function from int to uint32 */ 126 public static final Call TO_UINT32_DOUBLE = staticCall(JSTYPE_LOOKUP, JSType.class, "toUint32Double", double.class, int.class); 127 128 /** JavaScript compliant conversion function from Object to uint32 */ 129 public static final Call TO_UINT32 = staticCall(JSTYPE_LOOKUP, JSType.class, "toUint32", long.class, Object.class); 130 131 /** JavaScript compliant conversion function from number to uint32 */ 132 public static final Call TO_UINT32_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toUint32", long.class, double.class); 133 134 /** JavaScript compliant conversion function from number to String */ 135 public static final Call TO_STRING_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toString", String.class, double.class); 136 137 /** Combined call to toPrimitive followed by toString. */ 138 public static final Call TO_PRIMITIVE_TO_STRING = staticCall(JSTYPE_LOOKUP, JSType.class, "toPrimitiveToString", String.class, Object.class); 139 140 /** Combined call to toPrimitive followed by toCharSequence. */ 141 public static final Call TO_PRIMITIVE_TO_CHARSEQUENCE = staticCall(JSTYPE_LOOKUP, JSType.class, "toPrimitiveToCharSequence", CharSequence.class, Object.class); 142 143 /** Throw an unwarranted optimism exception */ 144 public static final Call THROW_UNWARRANTED = staticCall(JSTYPE_LOOKUP, JSType.class, "throwUnwarrantedOptimismException", Object.class, Object.class, int.class); 145 146 /** Add exact wrapper for potentially overflowing integer operations */ 147 public static final Call ADD_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "addExact", int.class, int.class, int.class, int.class); 148 149 /** Sub exact wrapper for potentially overflowing integer operations */ 150 public static final Call SUB_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "subExact", int.class, int.class, int.class, int.class); 151 152 /** Multiply exact wrapper for potentially overflowing integer operations */ 153 public static final Call MUL_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "mulExact", int.class, int.class, int.class, int.class); 154 155 /** Div exact wrapper for potentially integer division that turns into float point */ 156 public static final Call DIV_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "divExact", int.class, int.class, int.class, int.class); 157 158 /** Div zero wrapper for integer division that handles (0/0)|0 == 0 */ 159 public static final Call DIV_ZERO = staticCall(JSTYPE_LOOKUP, JSType.class, "divZero", int.class, int.class, int.class); 160 161 /** Mod zero wrapper for integer division that handles (0%0)|0 == 0 */ 162 public static final Call REM_ZERO = staticCall(JSTYPE_LOOKUP, JSType.class, "remZero", int.class, int.class, int.class); 163 164 /** Mod exact wrapper for potentially integer remainders that turns into float point */ 165 public static final Call REM_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "remExact", int.class, int.class, int.class, int.class); 166 167 /** Decrement exact wrapper for potentially overflowing integer operations */ 168 public static final Call DECREMENT_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "decrementExact", int.class, int.class, int.class); 169 170 /** Increment exact wrapper for potentially overflowing integer operations */ 171 public static final Call INCREMENT_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "incrementExact", int.class, int.class, int.class); 172 173 /** Negate exact exact wrapper for potentially overflowing integer operations */ 174 public static final Call NEGATE_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "negateExact", int.class, int.class, int.class); 175 176 /** Method handle to convert a JS Object to a Java array. */ 177 public static final Call TO_JAVA_ARRAY = staticCall(JSTYPE_LOOKUP, JSType.class, "toJavaArray", Object.class, Object.class, Class.class); 178 179 /** Method handle to convert a JS Object to a Java array. */ 180 public static final Call TO_JAVA_ARRAY_WITH_LOOKUP = staticCall(JSTYPE_LOOKUP, JSType.class, "toJavaArrayWithLookup", Object.class, Object.class, Class.class, SecureLookupSupplier.class); 181 182 /** Method handle for void returns. */ 183 public static final Call VOID_RETURN = staticCall(JSTYPE_LOOKUP, JSType.class, "voidReturn", void.class); 184 185 /** Method handle for isString method */ 186 public static final Call IS_STRING = staticCall(JSTYPE_LOOKUP, JSType.class, "isString", boolean.class, Object.class); 187 188 /** Method handle for isNumber method */ 189 public static final Call IS_NUMBER = staticCall(JSTYPE_LOOKUP, JSType.class, "isNumber", boolean.class, Object.class); 190 191 /** 192 * The list of available accessor types in width order. This order is used for type guesses narrow{@literal ->} wide 193 * in the dual--fields world 194 */ 195 private static final List<Type> ACCESSOR_TYPES = Collections.unmodifiableList( 196 Arrays.asList( 197 Type.INT, 198 Type.NUMBER, 199 Type.OBJECT)); 200 201 /** table index for undefined type - hard coded so it can be used in switches at compile time */ 202 public static final int TYPE_UNDEFINED_INDEX = -1; 203 /** table index for integer type - hard coded so it can be used in switches at compile time */ 204 public static final int TYPE_INT_INDEX = 0; //getAccessorTypeIndex(int.class); 205 /** table index for double type - hard coded so it can be used in switches at compile time */ 206 public static final int TYPE_DOUBLE_INDEX = 1; //getAccessorTypeIndex(double.class); 207 /** table index for object type - hard coded so it can be used in switches at compile time */ 208 public static final int TYPE_OBJECT_INDEX = 2; //getAccessorTypeIndex(Object.class); 209 210 /** object conversion quickies with JS semantics - used for return value and parameter filter */ 211 public static final List<MethodHandle> CONVERT_OBJECT = toUnmodifiableList( 212 JSType.TO_INT32.methodHandle(), 213 JSType.TO_NUMBER.methodHandle(), 214 null 215 ); 216 217 /** 218 * object conversion quickies with JS semantics - used for return value and parameter filter, optimistic 219 * throws exception upon incompatible type (asking for a narrower one than the storage) 220 */ 221 public static final List<MethodHandle> CONVERT_OBJECT_OPTIMISTIC = toUnmodifiableList( 222 JSType.TO_INT32_OPTIMISTIC.methodHandle(), 223 JSType.TO_NUMBER_OPTIMISTIC.methodHandle(), 224 null 225 ); 226 227 /** The value of Undefined cast to an int32 */ 228 public static final int UNDEFINED_INT = 0; 229 /** The value of Undefined cast to a long */ 230 public static final long UNDEFINED_LONG = 0L; 231 /** The value of Undefined cast to a double */ 232 public static final double UNDEFINED_DOUBLE = Double.NaN; 233 234 // Minimum and maximum range between which every long value can be precisely represented as a double. 235 private static final long MAX_PRECISE_DOUBLE = 1L << 53; 236 private static final long MIN_PRECISE_DOUBLE = -MAX_PRECISE_DOUBLE; 237 238 /** 239 * Method handles for getters that return undefined coerced 240 * to the appropriate type 241 */ 242 public static final List<MethodHandle> GET_UNDEFINED = toUnmodifiableList( 243 MH.constant(int.class, UNDEFINED_INT), 244 MH.constant(double.class, UNDEFINED_DOUBLE), 245 MH.constant(Object.class, Undefined.getUndefined()) 246 ); 247 248 private static final double INT32_LIMIT = 4294967296.0; 249 250 /** 251 * Constructor 252 * 253 * @param typeName the type name 254 */ 255 private JSType(final String typeName) { 256 this.typeName = typeName; 257 } 258 259 /** 260 * The external type name as returned by ECMAScript "typeof" operator 261 * 262 * @return type name for this type 263 */ 264 public final String typeName() { 265 return this.typeName; 266 } 267 268 /** 269 * Return the JSType for a given object 270 * 271 * @param obj an object 272 * 273 * @return the JSType for the object 274 */ 275 public static JSType of(final Object obj) { 276 // Order of these statements is tuned for performance (see JDK-8024476) 277 if (obj == null) { 278 return JSType.NULL; 279 } 280 281 if (obj instanceof ScriptObject) { 282 return obj instanceof ScriptFunction ? JSType.FUNCTION : JSType.OBJECT; 283 } 284 285 if (obj instanceof Boolean) { 286 return JSType.BOOLEAN; 287 } 288 289 if (isString(obj)) { 290 return JSType.STRING; 291 } 292 293 if (isNumber(obj)) { 294 return JSType.NUMBER; 295 } 296 297 if (obj instanceof Symbol) { 298 return JSType.SYMBOL; 299 } 300 301 if (obj == ScriptRuntime.UNDEFINED) { 302 return JSType.UNDEFINED; 303 } 304 305 return Bootstrap.isCallable(obj) ? JSType.FUNCTION : JSType.OBJECT; 306 } 307 308 /** 309 * Similar to {@link #of(Object)}, but does not distinguish between {@link #FUNCTION} and {@link #OBJECT}, returning 310 * {@link #OBJECT} in both cases. The distinction is costly, and the EQ and STRICT_EQ predicates don't care about it 311 * so we maintain this version for their use. 312 * 313 * @param obj an object 314 * 315 * @return the JSType for the object; returns {@link #OBJECT} instead of {@link #FUNCTION} for functions. 316 */ 317 public static JSType ofNoFunction(final Object obj) { 318 // Order of these statements is tuned for performance (see JDK-8024476) 319 if (obj == null) { 320 return JSType.NULL; 321 } 322 323 if (obj instanceof ScriptObject) { 324 return JSType.OBJECT; 325 } 326 327 if (obj instanceof Boolean) { 328 return JSType.BOOLEAN; 329 } 330 331 if (isString(obj)) { 332 return JSType.STRING; 333 } 334 335 if (isNumber(obj)) { 336 return JSType.NUMBER; 337 } 338 339 if (obj == ScriptRuntime.UNDEFINED) { 340 return JSType.UNDEFINED; 341 } 342 343 if (obj instanceof Symbol) { 344 return JSType.SYMBOL; 345 } 346 347 return JSType.OBJECT; 348 } 349 350 /** 351 * Void return method handle glue 352 */ 353 public static void voidReturn() { 354 //empty 355 //TODO: fix up SetMethodCreator better so we don't need this stupid thing 356 } 357 358 /** 359 * Returns true if double number can be represented as an int 360 * 361 * @param number a long to inspect 362 * 363 * @return true for int representable longs 364 */ 365 public static boolean isRepresentableAsInt(final long number) { 366 return (int)number == number; 367 } 368 369 /** 370 * Returns true if double number can be represented as an int. Note that it returns true for negative 371 * zero. If you need to exclude negative zero, use {@link #isStrictlyRepresentableAsInt(double)}. 372 * 373 * @param number a double to inspect 374 * 375 * @return true for int representable doubles 376 */ 377 public static boolean isRepresentableAsInt(final double number) { 378 return (int)number == number; 379 } 380 381 /** 382 * Returns true if double number can be represented as an int. Note that it returns false for negative 383 * zero. If you don't need to distinguish negative zero, use {@link #isRepresentableAsInt(double)}. 384 * 385 * @param number a double to inspect 386 * 387 * @return true for int representable doubles 388 */ 389 public static boolean isStrictlyRepresentableAsInt(final double number) { 390 return isRepresentableAsInt(number) && isNotNegativeZero(number); 391 } 392 393 /** 394 * Returns true if Object can be represented as an int 395 * 396 * @param obj an object to inspect 397 * 398 * @return true for int representable objects 399 */ 400 public static boolean isRepresentableAsInt(final Object obj) { 401 if (obj instanceof Number) { 402 return isRepresentableAsInt(((Number)obj).doubleValue()); 403 } 404 return false; 405 } 406 407 /** 408 * Returns true if double number can be represented as a long. Note that it returns true for negative 409 * zero. 410 * 411 * @param number a double to inspect 412 * @return true for long representable doubles 413 */ 414 public static boolean isRepresentableAsLong(final double number) { 415 return (long)number == number; 416 } 417 418 /** 419 * Returns true if long number can be represented as double without loss of precision. 420 * @param number a long number 421 * @return true if the double representation does not lose precision 422 */ 423 public static boolean isRepresentableAsDouble(final long number) { 424 return MAX_PRECISE_DOUBLE >= number && number >= MIN_PRECISE_DOUBLE; 425 } 426 427 /** 428 * Returns true if the number is not the negative zero ({@code -0.0d}). 429 * @param number the number to test 430 * @return true if it is not the negative zero, false otherwise. 431 */ 432 private static boolean isNotNegativeZero(final double number) { 433 return Double.doubleToRawLongBits(number) != 0x8000000000000000L; 434 } 435 436 /** 437 * Check whether an object is primitive 438 * 439 * @param obj an object 440 * 441 * @return true if object is primitive (includes null and undefined) 442 */ 443 public static boolean isPrimitive(final Object obj) { 444 return obj == null || 445 obj == ScriptRuntime.UNDEFINED || 446 isString(obj) || 447 isNumber(obj) || 448 obj instanceof Boolean || 449 obj instanceof Symbol; 450 } 451 452 /** 453 * Primitive converter for an object 454 * 455 * @param obj an object 456 * 457 * @return primitive form of the object 458 */ 459 public static Object toPrimitive(final Object obj) { 460 return toPrimitive(obj, null); 461 } 462 463 /** 464 * Primitive converter for an object including type hint 465 * See ECMA 9.1 ToPrimitive 466 * 467 * @param obj an object 468 * @param hint a type hint 469 * 470 * @return the primitive form of the object 471 */ 472 public static Object toPrimitive(final Object obj, final Class<?> hint) { 473 if (obj instanceof ScriptObject) { 474 return toPrimitive((ScriptObject)obj, hint); 475 } else if (isPrimitive(obj)) { 476 return obj; 477 } else if (obj instanceof JSObject) { 478 return toPrimitive((JSObject)obj, hint); 479 } else if (obj instanceof StaticClass) { 480 final String name = ((StaticClass)obj).getRepresentedClass().getName(); 481 return new StringBuilder(12 + name.length()).append("[JavaClass ").append(name).append(']').toString(); 482 } 483 return obj.toString(); 484 } 485 486 private static Object toPrimitive(final ScriptObject sobj, final Class<?> hint) { 487 return requirePrimitive(sobj.getDefaultValue(hint)); 488 } 489 490 private static Object requirePrimitive(final Object result) { 491 if (!isPrimitive(result)) { 492 throw typeError("bad.default.value", result.toString()); 493 } 494 return result; 495 } 496 497 /** 498 * Primitive converter for a {@link JSObject} including type hint. Invokes 499 * {@link JSObject#getDefaultValue(Class)} and translates any thrown {@link UnsupportedOperationException} 500 * to a ECMAScript {@code TypeError}. 501 * See ECMA 9.1 ToPrimitive 502 * 503 * @param jsobj a JSObject 504 * @param hint a type hint 505 * 506 * @return the primitive form of the JSObject 507 */ 508 public static Object toPrimitive(final JSObject jsobj, final Class<?> hint) { 509 try { 510 return requirePrimitive(jsobj.getDefaultValue(hint)); 511 } catch (final UnsupportedOperationException e) { 512 throw new ECMAException(Context.getGlobal().newTypeError(e.getMessage()), e); 513 } 514 } 515 516 /** 517 * Combines a hintless toPrimitive and a toString call. 518 * 519 * @param obj an object 520 * 521 * @return the string form of the primitive form of the object 522 */ 523 public static String toPrimitiveToString(final Object obj) { 524 return toString(toPrimitive(obj)); 525 } 526 527 /** 528 * Like {@link #toPrimitiveToString(Object)}, but avoids conversion of ConsString to String. 529 * 530 * @param obj an object 531 * @return the CharSequence form of the primitive form of the object 532 */ 533 public static CharSequence toPrimitiveToCharSequence(final Object obj) { 534 return toCharSequence(toPrimitive(obj)); 535 } 536 537 /** 538 * JavaScript compliant conversion of number to boolean 539 * 540 * @param num a number 541 * 542 * @return a boolean 543 */ 544 public static boolean toBoolean(final double num) { 545 return num != 0 && !Double.isNaN(num); 546 } 547 548 /** 549 * JavaScript compliant conversion of Object to boolean 550 * See ECMA 9.2 ToBoolean 551 * 552 * @param obj an object 553 * 554 * @return a boolean 555 */ 556 public static boolean toBoolean(final Object obj) { 557 if (obj instanceof Boolean) { 558 return (Boolean)obj; 559 } 560 561 if (nullOrUndefined(obj)) { 562 return false; 563 } 564 565 if (obj instanceof Number) { 566 final double num = ((Number)obj).doubleValue(); 567 return num != 0 && !Double.isNaN(num); 568 } 569 570 if (isString(obj)) { 571 return ((CharSequence)obj).length() > 0; 572 } 573 574 return true; 575 } 576 577 578 /** 579 * JavaScript compliant converter of Object to String 580 * See ECMA 9.8 ToString 581 * 582 * @param obj an object 583 * 584 * @return a string 585 */ 586 public static String toString(final Object obj) { 587 return toStringImpl(obj, false); 588 } 589 590 /** 591 * See ES6 #7.1.14 592 * @param obj key object 593 * @return property key 594 */ 595 public static Object toPropertyKey(final Object obj) { 596 return obj instanceof Symbol ? obj : toStringImpl(obj, false); 597 } 598 599 /** 600 * If obj is an instance of {@link ConsString} cast to CharSequence, else return 601 * result of {@link #toString(Object)}. 602 * 603 * @param obj an object 604 * @return an instance of String or ConsString 605 */ 606 public static CharSequence toCharSequence(final Object obj) { 607 if (obj instanceof ConsString) { 608 return (CharSequence) obj; 609 } 610 return toString(obj); 611 } 612 613 /** 614 * Returns true if object represents a primitive JavaScript string value. 615 * @param obj the object 616 * @return true if the object represents a primitive JavaScript string value. 617 */ 618 public static boolean isString(final Object obj) { 619 return obj instanceof String || obj instanceof ConsString; 620 } 621 622 /** 623 * Returns true if object represents a primitive JavaScript number value. Note that we only 624 * treat wrapper objects of Java primitive number types as objects that can be fully represented 625 * as JavaScript numbers (doubles). This means we exclude {@code long} and special purpose Number 626 * instances such as {@link java.util.concurrent.atomic.AtomicInteger}, as well as arbitrary precision 627 * numbers such as {@link java.math.BigInteger}. 628 * 629 * @param obj the object 630 * @return true if the object represents a primitive JavaScript number value. 631 */ 632 public static boolean isNumber(final Object obj) { 633 if (obj != null) { 634 final Class<?> c = obj.getClass(); 635 return c == Integer.class || c == Double.class || c == Float.class || c == Short.class || c == Byte.class; 636 } 637 return false; 638 } 639 640 /** 641 * JavaScript compliant conversion of integer to String 642 * 643 * @param num an integer 644 * 645 * @return a string 646 */ 647 public static String toString(final int num) { 648 return Integer.toString(num); 649 } 650 651 /** 652 * JavaScript compliant conversion of number to String 653 * See ECMA 9.8.1 654 * 655 * @param num a number 656 * 657 * @return a string 658 */ 659 public static String toString(final double num) { 660 if (isRepresentableAsInt(num)) { 661 return Integer.toString((int)num); 662 } 663 664 if (num == Double.POSITIVE_INFINITY) { 665 return "Infinity"; 666 } 667 668 if (num == Double.NEGATIVE_INFINITY) { 669 return "-Infinity"; 670 } 671 672 if (Double.isNaN(num)) { 673 return "NaN"; 674 } 675 676 return DoubleConversion.toShortestString(num); 677 } 678 679 /** 680 * JavaScript compliant conversion of number to String 681 * 682 * @param num a number 683 * @param radix a radix for the conversion 684 * 685 * @return a string 686 */ 687 public static String toString(final double num, final int radix) { 688 assert radix >= 2 && radix <= 36 : "invalid radix"; 689 690 if (isRepresentableAsInt(num)) { 691 return Integer.toString((int)num, radix); 692 } 693 694 if (num == Double.POSITIVE_INFINITY) { 695 return "Infinity"; 696 } 697 698 if (num == Double.NEGATIVE_INFINITY) { 699 return "-Infinity"; 700 } 701 702 if (Double.isNaN(num)) { 703 return "NaN"; 704 } 705 706 if (num == 0.0) { 707 return "0"; 708 } 709 710 final String chars = "0123456789abcdefghijklmnopqrstuvwxyz"; 711 final StringBuilder sb = new StringBuilder(); 712 713 final boolean negative = num < 0.0; 714 final double signedNum = negative ? -num : num; 715 716 double intPart = Math.floor(signedNum); 717 double decPart = signedNum - intPart; 718 719 // encode integer part from least significant digit, then reverse 720 do { 721 final double remainder = intPart % radix; 722 sb.append(chars.charAt((int) remainder)); 723 intPart -= remainder; 724 intPart /= radix; 725 } while (intPart >= 1.0); 726 727 if (negative) { 728 sb.append('-'); 729 } 730 sb.reverse(); 731 732 // encode decimal part 733 if (decPart > 0.0) { 734 final int dot = sb.length(); 735 sb.append('.'); 736 do { 737 decPart *= radix; 738 final double d = Math.floor(decPart); 739 sb.append(chars.charAt((int)d)); 740 decPart -= d; 741 } while (decPart > 0.0 && sb.length() - dot < 1100); 742 // somewhat arbitrarily use same limit as V8 743 } 744 745 return sb.toString(); 746 } 747 748 /** 749 * JavaScript compliant conversion of Object to number 750 * See ECMA 9.3 ToNumber 751 * 752 * @param obj an object 753 * 754 * @return a number 755 */ 756 public static double toNumber(final Object obj) { 757 if (obj instanceof Double) { 758 return (Double)obj; 759 } 760 if (obj instanceof Number) { 761 return ((Number)obj).doubleValue(); 762 } 763 return toNumberGeneric(obj); 764 } 765 766 /** 767 * Converts an object for a comparison with a number. Almost identical to {@link #toNumber(Object)} but 768 * converts {@code null} to {@code NaN} instead of zero, so it won't compare equal to zero. 769 * 770 * @param obj an object 771 * 772 * @return a number 773 */ 774 public static double toNumberForEq(final Object obj) { 775 // we are not able to detect Symbol objects from codegen, so we need to 776 // handle them here to avoid throwing an error in toNumber conversion. 777 return obj == null || obj instanceof Symbol || obj instanceof NativeSymbol ? Double.NaN : toNumber(obj); 778 } 779 780 /** 781 * Converts an object for strict comparison with a number. Returns {@code NaN} for any object that is not 782 * a {@link Number}, so only boxed numerics can compare strictly equal to numbers. 783 * 784 * @param obj an object 785 * 786 * @return a number 787 */ 788 public static double toNumberForStrictEq(final Object obj) { 789 if (obj instanceof Double) { 790 return (Double)obj; 791 } 792 if (isNumber(obj)) { 793 return ((Number)obj).doubleValue(); 794 } 795 return Double.NaN; 796 } 797 798 /** 799 * Convert a long to the narrowest JavaScript Number type. This returns either a 800 * {@link Integer} or {@link Double} depending on the magnitude of {@code l}. 801 * @param l a long value 802 * @return the value converted to Integer or Double 803 */ 804 public static Number toNarrowestNumber(final long l) { 805 return isRepresentableAsInt(l) ? Integer.valueOf((int) l) : Double.valueOf(l); 806 } 807 808 /** 809 * JavaScript compliant conversion of Boolean to number 810 * See ECMA 9.3 ToNumber 811 * 812 * @param b a boolean 813 * 814 * @return JS numeric value of the boolean: 1.0 or 0.0 815 */ 816 public static double toNumber(final Boolean b) { 817 return b ? 1d : +0d; 818 } 819 820 /** 821 * JavaScript compliant conversion of Object to number 822 * See ECMA 9.3 ToNumber 823 * 824 * @param obj an object 825 * 826 * @return a number 827 */ 828 public static double toNumber(final ScriptObject obj) { 829 return toNumber(toPrimitive(obj, Number.class)); 830 } 831 832 /** 833 * Optimistic number conversion - throws UnwarrantedOptimismException if Object 834 * 835 * @param obj object to convert 836 * @param programPoint program point 837 * @return double 838 */ 839 public static double toNumberOptimistic(final Object obj, final int programPoint) { 840 if (obj != null) { 841 final Class<?> clz = obj.getClass(); 842 if (clz == Double.class || clz == Integer.class || clz == Long.class) { 843 return ((Number)obj).doubleValue(); 844 } 845 } 846 throw new UnwarrantedOptimismException(obj, programPoint); 847 } 848 849 /** 850 * Object to number conversion that delegates to either {@link #toNumber(Object)} or to 851 * {@link #toNumberOptimistic(Object, int)} depending on whether the program point is valid or not. 852 * @param obj the object to convert 853 * @param programPoint the program point; can be invalid. 854 * @return the value converted to a number 855 * @throws UnwarrantedOptimismException if the value can't be represented as a number and the program point is valid. 856 */ 857 public static double toNumberMaybeOptimistic(final Object obj, final int programPoint) { 858 return UnwarrantedOptimismException.isValid(programPoint) ? toNumberOptimistic(obj, programPoint) : toNumber(obj); 859 } 860 861 /** 862 * Digit representation for a character 863 * 864 * @param ch a character 865 * @param radix radix 866 * 867 * @return the digit for this character 868 */ 869 public static int digit(final char ch, final int radix) { 870 return digit(ch, radix, false); 871 } 872 873 /** 874 * Digit representation for a character 875 * 876 * @param ch a character 877 * @param radix radix 878 * @param onlyIsoLatin1 iso latin conversion only 879 * 880 * @return the digit for this character 881 */ 882 public static int digit(final char ch, final int radix, final boolean onlyIsoLatin1) { 883 final char maxInRadix = (char)('a' + (radix - 1) - 10); 884 final char c = Character.toLowerCase(ch); 885 886 if (c >= 'a' && c <= maxInRadix) { 887 return Character.digit(ch, radix); 888 } 889 890 if (Character.isDigit(ch)) { 891 if (!onlyIsoLatin1 || ch >= '0' && ch <= '9') { 892 return Character.digit(ch, radix); 893 } 894 } 895 896 return -1; 897 } 898 899 /** 900 * JavaScript compliant String to number conversion 901 * 902 * @param str a string 903 * 904 * @return a number 905 */ 906 public static double toNumber(final String str) { 907 int end = str.length(); 908 if (end == 0) { 909 return 0.0; // Empty string 910 } 911 912 int start = 0; 913 char f = str.charAt(0); 914 915 while (Lexer.isJSWhitespace(f)) { 916 if (++start == end) { 917 return 0.0d; // All whitespace string 918 } 919 f = str.charAt(start); 920 } 921 922 // Guaranteed to terminate even without start >= end check, as the previous loop found at least one 923 // non-whitespace character. 924 while (Lexer.isJSWhitespace(str.charAt(end - 1))) { 925 end--; 926 } 927 928 final boolean negative; 929 if (f == '-') { 930 if(++start == end) { 931 return Double.NaN; // Single-char "-" string 932 } 933 f = str.charAt(start); 934 negative = true; 935 } else { 936 if (f == '+') { 937 if (++start == end) { 938 return Double.NaN; // Single-char "+" string 939 } 940 f = str.charAt(start); 941 } 942 negative = false; 943 } 944 945 final double value; 946 if (start + 1 < end && f == '0' && Character.toLowerCase(str.charAt(start + 1)) == 'x') { 947 //decode hex string 948 value = parseRadix(str.toCharArray(), start + 2, end, 16); 949 } else if (f == 'I' && end - start == 8 && str.regionMatches(start, "Infinity", 0, 8)) { 950 return negative ? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY; 951 } else { 952 // Fast (no NumberFormatException) path to NaN for non-numeric strings. 953 for (int i = start; i < end; i++) { 954 f = str.charAt(i); 955 if ((f < '0' || f > '9') && f != '.' && f != 'e' && f != 'E' && f != '+' && f != '-') { 956 return Double.NaN; 957 } 958 } 959 try { 960 value = Double.parseDouble(str.substring(start, end)); 961 } catch (final NumberFormatException e) { 962 return Double.NaN; 963 } 964 } 965 966 return negative ? -value : value; 967 } 968 969 /** 970 * JavaScript compliant Object to integer conversion. See ECMA 9.4 ToInteger 971 * 972 * <p>Note that this returns {@link java.lang.Integer#MAX_VALUE} or {@link java.lang.Integer#MIN_VALUE} 973 * for double values that exceed the int range, including positive and negative Infinity. It is the 974 * caller's responsibility to handle such values correctly.</p> 975 * 976 * @param obj an object 977 * @return an integer 978 */ 979 public static int toInteger(final Object obj) { 980 return (int)toNumber(obj); 981 } 982 983 /** 984 * Converts an Object to long. 985 * 986 * <p>Note that this returns {@link java.lang.Long#MAX_VALUE} or {@link java.lang.Long#MIN_VALUE} 987 * for double values that exceed the long range, including positive and negative Infinity. It is the 988 * caller's responsibility to handle such values correctly.</p> 989 * 990 * @param obj an object 991 * @return a long 992 */ 993 public static long toLong(final Object obj) { 994 return obj instanceof Long ? ((Long)obj) : toLong(toNumber(obj)); 995 } 996 997 /** 998 * Converts a double to long. 999 * 1000 * @param num the double to convert 1001 * @return the converted long value 1002 */ 1003 public static long toLong(final double num) { 1004 return (long)num; 1005 } 1006 1007 /** 1008 * JavaScript compliant Object to int32 conversion 1009 * See ECMA 9.5 ToInt32 1010 * 1011 * @param obj an object 1012 * @return an int32 1013 */ 1014 public static int toInt32(final Object obj) { 1015 return toInt32(toNumber(obj)); 1016 } 1017 1018 /** 1019 * Optimistic int conversion - throws UnwarrantedOptimismException if double, long or Object 1020 * 1021 * @param obj object to convert 1022 * @param programPoint program point 1023 * @return double 1024 */ 1025 public static int toInt32Optimistic(final Object obj, final int programPoint) { 1026 if (obj != null && obj.getClass() == Integer.class) { 1027 return ((Integer)obj); 1028 } 1029 throw new UnwarrantedOptimismException(obj, programPoint); 1030 } 1031 1032 /** 1033 * Object to int conversion that delegates to either {@link #toInt32(Object)} or to 1034 * {@link #toInt32Optimistic(Object, int)} depending on whether the program point is valid or not. 1035 * @param obj the object to convert 1036 * @param programPoint the program point; can be invalid. 1037 * @return the value converted to int 1038 * @throws UnwarrantedOptimismException if the value can't be represented as int and the program point is valid. 1039 */ 1040 public static int toInt32MaybeOptimistic(final Object obj, final int programPoint) { 1041 return UnwarrantedOptimismException.isValid(programPoint) ? toInt32Optimistic(obj, programPoint) : toInt32(obj); 1042 } 1043 1044 /** 1045 * JavaScript compliant long to int32 conversion 1046 * 1047 * @param num a long 1048 * @return an int32 1049 */ 1050 public static int toInt32(final long num) { 1051 return (int)(num >= MIN_PRECISE_DOUBLE && num <= MAX_PRECISE_DOUBLE ? num : (long)(num % INT32_LIMIT)); 1052 } 1053 1054 1055 /** 1056 * JavaScript compliant number to int32 conversion 1057 * 1058 * @param num a number 1059 * @return an int32 1060 */ 1061 public static int toInt32(final double num) { 1062 return (int)doubleToInt32(num); 1063 } 1064 1065 /** 1066 * JavaScript compliant Object to uint32 conversion 1067 * 1068 * @param obj an object 1069 * @return a uint32 1070 */ 1071 public static long toUint32(final Object obj) { 1072 return toUint32(toNumber(obj)); 1073 } 1074 1075 /** 1076 * JavaScript compliant number to uint32 conversion 1077 * 1078 * @param num a number 1079 * @return a uint32 1080 */ 1081 public static long toUint32(final double num) { 1082 return doubleToInt32(num) & MAX_UINT; 1083 } 1084 1085 /** 1086 * JavaScript compliant int to uint32 conversion 1087 * 1088 * @param num an int 1089 * @return a uint32 1090 */ 1091 public static long toUint32(final int num) { 1092 return num & MAX_UINT; 1093 } 1094 1095 /** 1096 * Optimistic JavaScript compliant int to uint32 conversion 1097 * @param num an int 1098 * @param pp the program point 1099 * @return the uint32 value if it can be represented by an int 1100 * @throws UnwarrantedOptimismException if uint32 value cannot be represented by an int 1101 */ 1102 public static int toUint32Optimistic(final int num, final int pp) { 1103 if (num >= 0) { 1104 return num; 1105 } 1106 throw new UnwarrantedOptimismException(toUint32Double(num), pp, Type.NUMBER); 1107 } 1108 1109 /** 1110 * JavaScript compliant int to uint32 conversion with double return type 1111 * @param num an int 1112 * @return the uint32 value as double 1113 */ 1114 public static double toUint32Double(final int num) { 1115 return toUint32(num); 1116 } 1117 1118 /** 1119 * JavaScript compliant Object to uint16 conversion 1120 * ECMA 9.7 ToUint16: (Unsigned 16 Bit Integer) 1121 * 1122 * @param obj an object 1123 * @return a uint16 1124 */ 1125 public static int toUint16(final Object obj) { 1126 return toUint16(toNumber(obj)); 1127 } 1128 1129 /** 1130 * JavaScript compliant number to uint16 conversion 1131 * 1132 * @param num a number 1133 * @return a uint16 1134 */ 1135 public static int toUint16(final int num) { 1136 return num & 0xffff; 1137 } 1138 1139 /** 1140 * JavaScript compliant number to uint16 conversion 1141 * 1142 * @param num a number 1143 * @return a uint16 1144 */ 1145 public static int toUint16(final long num) { 1146 return (int)num & 0xffff; 1147 } 1148 1149 /** 1150 * JavaScript compliant number to uint16 conversion 1151 * 1152 * @param num a number 1153 * @return a uint16 1154 */ 1155 public static int toUint16(final double num) { 1156 return (int)doubleToInt32(num) & 0xffff; 1157 } 1158 1159 private static long doubleToInt32(final double num) { 1160 final int exponent = Math.getExponent(num); 1161 if (exponent < 31) { 1162 return (long) num; // Fits into 32 bits 1163 } 1164 if (exponent >= 84) { 1165 // Either infinite or NaN or so large that shift / modulo will produce 0 1166 // (52 bit mantissa + 32 bit target width). 1167 return 0; 1168 } 1169 // This is rather slow and could probably be sped up using bit-fiddling. 1170 final double d = num >= 0 ? Math.floor(num) : Math.ceil(num); 1171 return (long)(d % INT32_LIMIT); 1172 } 1173 1174 /** 1175 * Check whether a number is finite 1176 * 1177 * @param num a number 1178 * @return true if finite 1179 */ 1180 public static boolean isFinite(final double num) { 1181 return !Double.isInfinite(num) && !Double.isNaN(num); 1182 } 1183 1184 /** 1185 * Convert a primitive to a double 1186 * 1187 * @param num a double 1188 * @return a boxed double 1189 */ 1190 public static Double toDouble(final double num) { 1191 return num; 1192 } 1193 1194 /** 1195 * Convert a primitive to a double 1196 * 1197 * @param num a long 1198 * @return a boxed double 1199 */ 1200 public static Double toDouble(final long num) { 1201 return (double)num; 1202 } 1203 1204 /** 1205 * Convert a primitive to a double 1206 * 1207 * @param num an int 1208 * @return a boxed double 1209 */ 1210 public static Double toDouble(final int num) { 1211 return (double)num; 1212 } 1213 1214 /** 1215 * Convert a boolean to an Object 1216 * 1217 * @param bool a boolean 1218 * @return a boxed boolean, its Object representation 1219 */ 1220 public static Object toObject(final boolean bool) { 1221 return bool; 1222 } 1223 1224 /** 1225 * Convert a number to an Object 1226 * 1227 * @param num an integer 1228 * @return the boxed number 1229 */ 1230 public static Object toObject(final int num) { 1231 return num; 1232 } 1233 1234 /** 1235 * Convert a number to an Object 1236 * 1237 * @param num a long 1238 * @return the boxed number 1239 */ 1240 public static Object toObject(final long num) { 1241 return num; 1242 } 1243 1244 /** 1245 * Convert a number to an Object 1246 * 1247 * @param num a double 1248 * @return the boxed number 1249 */ 1250 public static Object toObject(final double num) { 1251 return num; 1252 } 1253 1254 /** 1255 * Identity converter for objects. 1256 * 1257 * @param obj an object 1258 * @return the boxed number 1259 */ 1260 public static Object toObject(final Object obj) { 1261 return obj; 1262 } 1263 1264 /** 1265 * Object conversion. This is used to convert objects and numbers to their corresponding 1266 * NativeObject type 1267 * See ECMA 9.9 ToObject 1268 * 1269 * @param obj the object to convert 1270 * 1271 * @return the wrapped object 1272 */ 1273 public static Object toScriptObject(final Object obj) { 1274 return toScriptObject(Context.getGlobal(), obj); 1275 } 1276 1277 /** 1278 * Object conversion. This is used to convert objects and numbers to their corresponding 1279 * NativeObject type 1280 * See ECMA 9.9 ToObject 1281 * 1282 * @param global the global object 1283 * @param obj the object to convert 1284 * 1285 * @return the wrapped object 1286 */ 1287 public static Object toScriptObject(final Global global, final Object obj) { 1288 if (nullOrUndefined(obj)) { 1289 throw typeError(global, "not.an.object", ScriptRuntime.safeToString(obj)); 1290 } 1291 1292 if (obj instanceof ScriptObject) { 1293 return obj; 1294 } 1295 1296 return global.wrapAsObject(obj); 1297 } 1298 1299 /** 1300 * Script object to Java array conversion. 1301 * 1302 * @param obj script object to be converted to Java array 1303 * @param componentType component type of the destination array required 1304 * @return converted Java array 1305 */ 1306 public static Object toJavaArray(final Object obj, final Class<?> componentType) { 1307 if (obj instanceof ScriptObject) { 1308 return ((ScriptObject)obj).getArray().asArrayOfType(componentType); 1309 } else if (obj instanceof JSObject) { 1310 final ArrayLikeIterator<?> itr = ArrayLikeIterator.arrayLikeIterator(obj); 1311 final int len = (int) itr.getLength(); 1312 final Object[] res = new Object[len]; 1313 int idx = 0; 1314 while (itr.hasNext()) { 1315 res[idx++] = itr.next(); 1316 } 1317 return convertArray(res, componentType); 1318 } else if(obj == null) { 1319 return null; 1320 } else { 1321 throw new IllegalArgumentException("not a script object"); 1322 } 1323 } 1324 1325 /** 1326 * Script object to Java array conversion. 1327 * 1328 * @param obj script object to be converted to Java array 1329 * @param componentType component type of the destination array required 1330 * @param lookupSupplier supplier for the lookup of the class invoking the 1331 * conversion. Can be used to use protection-domain specific converters 1332 * if the target type is a SAM. 1333 * @return converted Java array 1334 */ 1335 public static Object toJavaArrayWithLookup(final Object obj, final Class<?> componentType, final SecureLookupSupplier lookupSupplier) { 1336 return Bootstrap.getLinkerServices().getWithLookup(()->toJavaArray(obj, componentType), lookupSupplier); 1337 } 1338 1339 /** 1340 * Java array to java array conversion - but using type conversions implemented by linker. 1341 * 1342 * @param src source array 1343 * @param componentType component type of the destination array required 1344 * @return converted Java array 1345 */ 1346 public static Object convertArray(final Object[] src, final Class<?> componentType) { 1347 if(componentType == Object.class) { 1348 for(int i = 0; i < src.length; ++i) { 1349 final Object e = src[i]; 1350 if(e instanceof ConsString) { 1351 src[i] = e.toString(); 1352 } 1353 } 1354 } 1355 1356 final int l = src.length; 1357 final Object dst = Array.newInstance(componentType, l); 1358 final MethodHandle converter = Bootstrap.getLinkerServices().getTypeConverter(Object.class, componentType); 1359 try { 1360 for (int i = 0; i < src.length; i++) { 1361 Array.set(dst, i, invoke(converter, src[i])); 1362 } 1363 } catch (final RuntimeException | Error e) { 1364 throw e; 1365 } catch (final Throwable t) { 1366 throw new RuntimeException(t); 1367 } 1368 return dst; 1369 } 1370 1371 /** 1372 * Check if an object is null or undefined 1373 * 1374 * @param obj object to check 1375 * 1376 * @return true if null or undefined 1377 */ 1378 public static boolean nullOrUndefined(final Object obj) { 1379 return obj == null || obj == ScriptRuntime.UNDEFINED; 1380 } 1381 1382 static String toStringImpl(final Object obj, final boolean safe) { 1383 if (obj instanceof String) { 1384 return (String)obj; 1385 } 1386 1387 if (obj instanceof ConsString) { 1388 return obj.toString(); 1389 } 1390 1391 if (isNumber(obj)) { 1392 return toString(((Number)obj).doubleValue()); 1393 } 1394 1395 if (obj == ScriptRuntime.UNDEFINED) { 1396 return "undefined"; 1397 } 1398 1399 if (obj == null) { 1400 return "null"; 1401 } 1402 1403 if (obj instanceof Boolean) { 1404 return obj.toString(); 1405 } 1406 1407 if (obj instanceof Symbol) { 1408 if (safe) { 1409 return obj.toString(); 1410 } 1411 throw typeError("symbol.to.string"); 1412 } 1413 1414 if (safe && obj instanceof ScriptObject) { 1415 final ScriptObject sobj = (ScriptObject)obj; 1416 final Global gobj = Context.getGlobal(); 1417 return gobj.isError(sobj) ? 1418 ECMAException.safeToString(sobj) : 1419 sobj.safeToString(); 1420 } 1421 1422 return toString(toPrimitive(obj, String.class)); 1423 } 1424 1425 // trim from left for JS whitespaces. 1426 static String trimLeft(final String str) { 1427 int start = 0; 1428 1429 while (start < str.length() && Lexer.isJSWhitespace(str.charAt(start))) { 1430 start++; 1431 } 1432 1433 return str.substring(start); 1434 } 1435 1436 /** 1437 * Throw an unwarranted optimism exception for a program point 1438 * @param value real return value 1439 * @param programPoint program point 1440 * @return 1441 */ 1442 @SuppressWarnings("unused") 1443 private static Object throwUnwarrantedOptimismException(final Object value, final int programPoint) { 1444 throw new UnwarrantedOptimismException(value, programPoint); 1445 } 1446 1447 /** 1448 * Wrapper for addExact 1449 * 1450 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1451 * containing the result and the program point of the failure 1452 * 1453 * @param x first term 1454 * @param y second term 1455 * @param programPoint program point id 1456 * @return the result 1457 * @throws UnwarrantedOptimismException if overflow occurs 1458 */ 1459 public static int addExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1460 try { 1461 return Math.addExact(x, y); 1462 } catch (final ArithmeticException e) { 1463 throw new UnwarrantedOptimismException((double)x + (double)y, programPoint); 1464 } 1465 } 1466 1467 /** 1468 * Wrapper for subExact 1469 * 1470 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1471 * containing the result and the program point of the failure 1472 * 1473 * @param x first term 1474 * @param y second term 1475 * @param programPoint program point id 1476 * @return the result 1477 * @throws UnwarrantedOptimismException if overflow occurs 1478 */ 1479 public static int subExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1480 try { 1481 return Math.subtractExact(x, y); 1482 } catch (final ArithmeticException e) { 1483 throw new UnwarrantedOptimismException((double)x - (double)y, programPoint); 1484 } 1485 } 1486 1487 /** 1488 * Wrapper for mulExact 1489 * 1490 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1491 * containing the result and the program point of the failure 1492 * 1493 * @param x first term 1494 * @param y second term 1495 * @param programPoint program point id 1496 * @return the result 1497 * @throws UnwarrantedOptimismException if overflow occurs 1498 */ 1499 public static int mulExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1500 try { 1501 return Math.multiplyExact(x, y); 1502 } catch (final ArithmeticException e) { 1503 throw new UnwarrantedOptimismException((double)x * (double)y, programPoint); 1504 } 1505 } 1506 1507 /** 1508 * Wrapper for divExact. Throws UnwarrantedOptimismException if the result of the division can't be represented as 1509 * int. 1510 * 1511 * @param x first term 1512 * @param y second term 1513 * @param programPoint program point id 1514 * @return the result 1515 * @throws UnwarrantedOptimismException if the result of the division can't be represented as int. 1516 */ 1517 public static int divExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1518 final int res; 1519 try { 1520 res = x / y; 1521 } catch (final ArithmeticException e) { 1522 assert y == 0; // Only div by zero anticipated 1523 throw new UnwarrantedOptimismException(x > 0 ? Double.POSITIVE_INFINITY : x < 0 ? Double.NEGATIVE_INFINITY : Double.NaN, programPoint); 1524 } 1525 final int rem = x % y; 1526 if (rem == 0) { 1527 return res; 1528 } 1529 // go directly to double here, as anything with non zero remainder is a floating point number in JavaScript 1530 throw new UnwarrantedOptimismException((double)x / (double)y, programPoint); 1531 } 1532 1533 /** 1534 * Implements int division but allows {@code x / 0} to be represented as 0. Basically equivalent to 1535 * {@code (x / y)|0} JavaScript expression (division of two ints coerced to int). 1536 * @param x the dividend 1537 * @param y the divisor 1538 * @return the result 1539 */ 1540 public static int divZero(final int x, final int y) { 1541 return y == 0 ? 0 : x / y; 1542 } 1543 1544 /** 1545 * Implements int remainder but allows {@code x % 0} to be represented as 0. Basically equivalent to 1546 * {@code (x % y)|0} JavaScript expression (remainder of two ints coerced to int). 1547 * @param x the dividend 1548 * @param y the divisor 1549 * @return the remainder 1550 */ 1551 public static int remZero(final int x, final int y) { 1552 return y == 0 ? 0 : x % y; 1553 } 1554 1555 /** 1556 * Wrapper for modExact. Throws UnwarrantedOptimismException if the modulo can't be represented as int. 1557 * 1558 * @param x first term 1559 * @param y second term 1560 * @param programPoint program point id 1561 * @return the result 1562 * @throws UnwarrantedOptimismException if the modulo can't be represented as int. 1563 */ 1564 public static int remExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1565 try { 1566 return x % y; 1567 } catch (final ArithmeticException e) { 1568 assert y == 0; // Only mod by zero anticipated 1569 throw new UnwarrantedOptimismException(Double.NaN, programPoint); 1570 } 1571 } 1572 1573 /** 1574 * Wrapper for decrementExact 1575 * 1576 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1577 * containing the result and the program point of the failure 1578 * 1579 * @param x number to negate 1580 * @param programPoint program point id 1581 * @return the result 1582 * @throws UnwarrantedOptimismException if overflow occurs 1583 */ 1584 public static int decrementExact(final int x, final int programPoint) throws UnwarrantedOptimismException { 1585 try { 1586 return Math.decrementExact(x); 1587 } catch (final ArithmeticException e) { 1588 throw new UnwarrantedOptimismException((double)x - 1, programPoint); 1589 } 1590 } 1591 1592 /** 1593 * Wrapper for incrementExact 1594 * 1595 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1596 * containing the result and the program point of the failure 1597 * 1598 * @param x the number to increment 1599 * @param programPoint program point id 1600 * @return the result 1601 * @throws UnwarrantedOptimismException if overflow occurs 1602 */ 1603 public static int incrementExact(final int x, final int programPoint) throws UnwarrantedOptimismException { 1604 try { 1605 return Math.incrementExact(x); 1606 } catch (final ArithmeticException e) { 1607 throw new UnwarrantedOptimismException((double)x + 1, programPoint); 1608 } 1609 } 1610 1611 /** 1612 * Wrapper for negateExact 1613 * 1614 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1615 * containing the result and the program point of the failure 1616 * 1617 * @param x the number to negate 1618 * @param programPoint program point id 1619 * @return the result 1620 * @throws UnwarrantedOptimismException if overflow occurs 1621 */ 1622 public static int negateExact(final int x, final int programPoint) throws UnwarrantedOptimismException { 1623 try { 1624 if (x == 0) { 1625 throw new UnwarrantedOptimismException(-0.0, programPoint); 1626 } 1627 return Math.negateExact(x); 1628 } catch (final ArithmeticException e) { 1629 throw new UnwarrantedOptimismException(-(double)x, programPoint); 1630 } 1631 } 1632 1633 /** 1634 * Given a type of an accessor, return its index in [0..getNumberOfAccessorTypes()) 1635 * 1636 * @param type the type 1637 * 1638 * @return the accessor index, or -1 if no accessor of this type exists 1639 */ 1640 public static int getAccessorTypeIndex(final Type type) { 1641 return getAccessorTypeIndex(type.getTypeClass()); 1642 } 1643 1644 /** 1645 * Given a class of an accessor, return its index in [0..getNumberOfAccessorTypes()) 1646 * 1647 * Note that this is hardcoded with respect to the dynamic contents of the accessor 1648 * types array for speed. Hotspot got stuck with this as 5% of the runtime in 1649 * a benchmark when it looped over values and increased an index counter. :-( 1650 * 1651 * @param type the type 1652 * 1653 * @return the accessor index, or -1 if no accessor of this type exists 1654 */ 1655 public static int getAccessorTypeIndex(final Class<?> type) { 1656 if (type == null) { 1657 return TYPE_UNDEFINED_INDEX; 1658 } else if (type == int.class) { 1659 return TYPE_INT_INDEX; 1660 } else if (type == double.class) { 1661 return TYPE_DOUBLE_INDEX; 1662 } else if (!type.isPrimitive()) { 1663 return TYPE_OBJECT_INDEX; 1664 } 1665 return -1; 1666 } 1667 1668 /** 1669 * Return the accessor type based on its index in [0..getNumberOfAccessorTypes()) 1670 * Indexes are ordered narrower{@literal ->}wider / optimistic{@literal ->}pessimistic. Invalidations always 1671 * go to a type of higher index 1672 * 1673 * @param index accessor type index 1674 * 1675 * @return a type corresponding to the index. 1676 */ 1677 1678 public static Type getAccessorType(final int index) { 1679 return ACCESSOR_TYPES.get(index); 1680 } 1681 1682 /** 1683 * Return the number of accessor types available. 1684 * 1685 * @return number of accessor types in system 1686 */ 1687 public static int getNumberOfAccessorTypes() { 1688 return ACCESSOR_TYPES.size(); 1689 } 1690 1691 private static double parseRadix(final char chars[], final int start, final int length, final int radix) { 1692 int pos = 0; 1693 1694 for (int i = start; i < length ; i++) { 1695 if (digit(chars[i], radix) == -1) { 1696 return Double.NaN; 1697 } 1698 pos++; 1699 } 1700 1701 if (pos == 0) { 1702 return Double.NaN; 1703 } 1704 1705 double value = 0.0; 1706 for (int i = start; i < start + pos; i++) { 1707 value *= radix; 1708 value += digit(chars[i], radix); 1709 } 1710 1711 return value; 1712 } 1713 1714 private static double toNumberGeneric(final Object obj) { 1715 if (obj == null) { 1716 return +0.0; 1717 } 1718 1719 if (obj instanceof String) { 1720 return toNumber((String)obj); 1721 } 1722 1723 if (obj instanceof ConsString) { 1724 return toNumber(obj.toString()); 1725 } 1726 1727 if (obj instanceof Boolean) { 1728 return toNumber((Boolean)obj); 1729 } 1730 1731 if (obj instanceof ScriptObject) { 1732 return toNumber((ScriptObject)obj); 1733 } 1734 1735 if (obj instanceof Undefined) { 1736 return Double.NaN; 1737 } 1738 1739 if (obj instanceof Symbol) { 1740 throw typeError("symbol.to.number"); 1741 } 1742 1743 return toNumber(toPrimitive(obj, Number.class)); 1744 } 1745 1746 private static Object invoke(final MethodHandle mh, final Object arg) { 1747 try { 1748 return mh.invoke(arg); 1749 } catch (final RuntimeException | Error e) { 1750 throw e; 1751 } catch (final Throwable t) { 1752 throw new RuntimeException(t); 1753 } 1754 } 1755 1756 /** 1757 * Create a method handle constant of the correct primitive type 1758 * for a constant object 1759 * @param o object 1760 * @return constant function that returns object 1761 */ 1762 public static MethodHandle unboxConstant(final Object o) { 1763 if (o != null) { 1764 if (o.getClass() == Integer.class) { 1765 return MH.constant(int.class, o); 1766 } else if (o.getClass() == Double.class) { 1767 return MH.constant(double.class, o); 1768 } 1769 } 1770 return MH.constant(Object.class, o); 1771 } 1772 1773 /** 1774 * Get the unboxed (primitive) type for an object 1775 * @param o object 1776 * @return primitive type or Object.class if not primitive 1777 */ 1778 public static Class<?> unboxedFieldType(final Object o) { 1779 if (o == null) { 1780 return Object.class; 1781 } else if (o.getClass() == Integer.class) { 1782 return int.class; 1783 } else if (o.getClass() == Double.class) { 1784 return double.class; 1785 } else { 1786 return Object.class; 1787 } 1788 } 1789 1790 private static List<MethodHandle> toUnmodifiableList(final MethodHandle... methodHandles) { 1791 return Collections.unmodifiableList(Arrays.asList(methodHandles)); 1792 } 1793} 1794