JSType.java revision 1003:37152862918f
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.codegen.ObjectClassGenerator.OBJECT_FIELDS_ONLY; 30import static jdk.nashorn.internal.lookup.Lookup.MH; 31import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; 32 33import java.lang.invoke.MethodHandle; 34import java.lang.invoke.MethodHandles; 35import java.lang.reflect.Array; 36import java.util.Arrays; 37import java.util.Collections; 38import java.util.Deque; 39import java.util.List; 40import jdk.internal.dynalink.beans.StaticClass; 41import jdk.nashorn.api.scripting.JSObject; 42import jdk.nashorn.internal.codegen.CompilerConstants.Call; 43import jdk.nashorn.internal.codegen.types.Type; 44import jdk.nashorn.internal.objects.Global; 45import jdk.nashorn.internal.parser.Lexer; 46import jdk.nashorn.internal.runtime.arrays.ArrayLikeIterator; 47import jdk.nashorn.internal.runtime.linker.Bootstrap; 48 49/** 50 * Representation for ECMAScript types - this maps directly to the ECMA script standard 51 */ 52public enum JSType { 53 /** The undefined type */ 54 UNDEFINED("undefined"), 55 56 /** The null type */ 57 NULL("object"), 58 59 /** The boolean type */ 60 BOOLEAN("boolean"), 61 62 /** The number type */ 63 NUMBER("number"), 64 65 /** The string type */ 66 STRING("string"), 67 68 /** The object type */ 69 OBJECT("object"), 70 71 /** The function type */ 72 FUNCTION("function"); 73 74 /** The type name as returned by ECMAScript "typeof" operator*/ 75 private final String typeName; 76 77 /** Max value for an uint32 in JavaScript */ 78 public static final long MAX_UINT = 0xFFFF_FFFFL; 79 80 private static final MethodHandles.Lookup JSTYPE_LOOKUP = MethodHandles.lookup(); 81 82 /** JavaScript compliant conversion function from Object to boolean */ 83 public static final Call TO_BOOLEAN = staticCall(JSTYPE_LOOKUP, JSType.class, "toBoolean", boolean.class, Object.class); 84 85 /** JavaScript compliant conversion function from number to boolean */ 86 public static final Call TO_BOOLEAN_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toBoolean", boolean.class, double.class); 87 88 /** JavaScript compliant conversion function from Object to integer */ 89 public static final Call TO_INTEGER = staticCall(JSTYPE_LOOKUP, JSType.class, "toInteger", int.class, Object.class); 90 91 /** JavaScript compliant conversion function from Object to long */ 92 public static final Call TO_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "toLong", long.class, Object.class); 93 94 /** JavaScript compliant conversion function from double to long */ 95 public static final Call TO_LONG_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toLong", long.class, double.class); 96 97 /** JavaScript compliant conversion function from Object to number */ 98 public static final Call TO_NUMBER = staticCall(JSTYPE_LOOKUP, JSType.class, "toNumber", double.class, Object.class); 99 100 /** JavaScript compliant conversion function from Object to number with type check */ 101 public static final Call TO_NUMBER_OPTIMISTIC = staticCall(JSTYPE_LOOKUP, JSType.class, "toNumberOptimistic", double.class, Object.class, int.class); 102 103 /** JavaScript compliant conversion function from Object to String */ 104 public static final Call TO_STRING = staticCall(JSTYPE_LOOKUP, JSType.class, "toString", String.class, Object.class); 105 106 /** JavaScript compliant conversion function from Object to int32 */ 107 public static final Call TO_INT32 = staticCall(JSTYPE_LOOKUP, JSType.class, "toInt32", int.class, Object.class); 108 109 /** JavaScript compliant conversion function from Object to int32 */ 110 public static final Call TO_INT32_L = staticCall(JSTYPE_LOOKUP, JSType.class, "toInt32", int.class, long.class); 111 112 /** JavaScript compliant conversion function from Object to int32 with type check */ 113 public static final Call TO_INT32_OPTIMISTIC = staticCall(JSTYPE_LOOKUP, JSType.class, "toInt32Optimistic", int.class, Object.class, int.class); 114 115 /** JavaScript compliant conversion function from double to int32 */ 116 public static final Call TO_INT32_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toInt32", int.class, double.class); 117 118 /** JavaScript compliant conversion function from Object to uint32 */ 119 public static final Call TO_UINT32 = staticCall(JSTYPE_LOOKUP, JSType.class, "toUint32", long.class, Object.class); 120 121 /** JavaScript compliant conversion function from Object to long with type check */ 122 public static final Call TO_LONG_OPTIMISTIC = staticCall(JSTYPE_LOOKUP, JSType.class, "toLongOptimistic", long.class, Object.class, int.class); 123 124 /** JavaScript compliant conversion function from number to uint32 */ 125 public static final Call TO_UINT32_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toUint32", long.class, double.class); 126 127 /** JavaScript compliant conversion function from number to String */ 128 public static final Call TO_STRING_D = staticCall(JSTYPE_LOOKUP, JSType.class, "toString", String.class, double.class); 129 130 /** Combined call to toPrimitive followed by toString. */ 131 public static final Call TO_PRIMITIVE_TO_STRING = staticCall(JSTYPE_LOOKUP, JSType.class, "toPrimitiveToString", String.class, Object.class); 132 133 /** Combined call to toPrimitive followed by toCharSequence. */ 134 public static final Call TO_PRIMITIVE_TO_CHARSEQUENCE = staticCall(JSTYPE_LOOKUP, JSType.class, "toPrimitiveToCharSequence", CharSequence.class, Object.class); 135 136 /** Throw an unwarranted optimism exception */ 137 public static final Call THROW_UNWARRANTED = staticCall(JSTYPE_LOOKUP, JSType.class, "throwUnwarrantedOptimismException", Object.class, Object.class, int.class); 138 139 /** Add exact wrapper for potentially overflowing integer operations */ 140 public static final Call ADD_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "addExact", int.class, int.class, int.class, int.class); 141 142 /** Sub exact wrapper for potentially overflowing integer operations */ 143 public static final Call SUB_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "subExact", int.class, int.class, int.class, int.class); 144 145 /** Multiply exact wrapper for potentially overflowing integer operations */ 146 public static final Call MUL_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "mulExact", int.class, int.class, int.class, int.class); 147 148 /** Div exact wrapper for potentially integer division that turns into float point */ 149 public static final Call DIV_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "divExact", int.class, int.class, int.class, int.class); 150 151 /** Mod exact wrapper for potentially integer remainders that turns into float point */ 152 public static final Call REM_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "remExact", int.class, int.class, int.class, int.class); 153 154 /** Decrement exact wrapper for potentially overflowing integer operations */ 155 public static final Call DECREMENT_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "decrementExact", int.class, int.class, int.class); 156 157 /** Increment exact wrapper for potentially overflowing integer operations */ 158 public static final Call INCREMENT_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "incrementExact", int.class, int.class, int.class); 159 160 /** Negate exact exact wrapper for potentially overflowing integer operations */ 161 public static final Call NEGATE_EXACT = staticCall(JSTYPE_LOOKUP, JSType.class, "negateExact", int.class, int.class, int.class); 162 163 /** Add exact wrapper for potentially overflowing long operations */ 164 public static final Call ADD_EXACT_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "addExact", long.class, long.class, long.class, int.class); 165 166 /** Sub exact wrapper for potentially overflowing long operations */ 167 public static final Call SUB_EXACT_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "subExact", long.class, long.class, long.class, int.class); 168 169 /** Multiply exact wrapper for potentially overflowing long operations */ 170 public static final Call MUL_EXACT_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "mulExact", long.class, long.class, long.class, int.class); 171 172 /** Div exact wrapper for potentially integer division that turns into float point */ 173 public static final Call DIV_EXACT_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "divExact", long.class, long.class, long.class, int.class); 174 175 /** Mod exact wrapper for potentially integer remainders that turns into float point */ 176 public static final Call REM_EXACT_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "remExact", long.class, long.class, long.class, int.class); 177 178 /** Decrement exact wrapper for potentially overflowing long operations */ 179 public static final Call DECREMENT_EXACT_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "decrementExact", long.class, long.class, int.class); 180 181 /** Increment exact wrapper for potentially overflowing long operations */ 182 public static final Call INCREMENT_EXACT_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "incrementExact", long.class, long.class, int.class); 183 184 /** Negate exact exact wrapper for potentially overflowing long operations */ 185 public static final Call NEGATE_EXACT_LONG = staticCall(JSTYPE_LOOKUP, JSType.class, "negateExact", long.class, long.class, int.class); 186 187 /** Method handle to convert a JS Object to a Java array. */ 188 public static final Call TO_JAVA_ARRAY = staticCall(JSTYPE_LOOKUP, JSType.class, "toJavaArray", Object.class, Object.class, Class.class); 189 190 /** Method handle to convert a JS Object to a Java List. */ 191 public static final Call TO_JAVA_LIST = staticCall(JSTYPE_LOOKUP, JSType.class, "toJavaList", List.class, Object.class); 192 193 /** Method handle to convert a JS Object to a Java deque. */ 194 public static final Call TO_JAVA_DEQUE = staticCall(JSTYPE_LOOKUP, JSType.class, "toJavaDeque", Deque.class, Object.class); 195 196 /** Method handle for void returns. */ 197 public static final Call VOID_RETURN = staticCall(JSTYPE_LOOKUP, JSType.class, "voidReturn", void.class); 198 199 200 /** 201 * The list of available accessor types in width order. This order is used for type guesses narrow{@literal ->} wide 202 * in the dual--fields world 203 */ 204 private static final List<Type> ACCESSOR_TYPES = Collections.unmodifiableList( 205 Arrays.asList( 206 Type.INT, 207 Type.LONG, 208 Type.NUMBER, 209 Type.OBJECT)); 210 211 /** table index for undefined type - hard coded so it can be used in switches at compile time */ 212 public static final int TYPE_UNDEFINED_INDEX = -1; 213 /** table index for integer type - hard coded so it can be used in switches at compile time */ 214 public static final int TYPE_INT_INDEX = 0; //getAccessorTypeIndex(int.class); 215 /** table index for long type - hard coded so it can be used in switches at compile time */ 216 public static final int TYPE_LONG_INDEX = 1; //getAccessorTypeIndex(long.class); 217 /** table index for double type - hard coded so it can be used in switches at compile time */ 218 public static final int TYPE_DOUBLE_INDEX = 2; //getAccessorTypeIndex(double.class); 219 /** table index for object type - hard coded so it can be used in switches at compile time */ 220 public static final int TYPE_OBJECT_INDEX = 3; //getAccessorTypeIndex(Object.class); 221 222 /** object conversion quickies with JS semantics - used for return value and parameter filter */ 223 public static final List<MethodHandle> CONVERT_OBJECT = toUnmodifiableList( 224 JSType.TO_INT32.methodHandle(), 225 JSType.TO_UINT32.methodHandle(), 226 JSType.TO_NUMBER.methodHandle(), 227 null 228 ); 229 230 /** 231 * object conversion quickies with JS semantics - used for return value and parameter filter, optimistic 232 * throws exception upon incompatible type (asking for a narrower one than the storage) 233 */ 234 public static final List<MethodHandle> CONVERT_OBJECT_OPTIMISTIC = toUnmodifiableList( 235 JSType.TO_INT32_OPTIMISTIC.methodHandle(), 236 JSType.TO_LONG_OPTIMISTIC.methodHandle(), 237 JSType.TO_NUMBER_OPTIMISTIC.methodHandle(), 238 null 239 ); 240 241 /** The value of Undefined cast to an int32 */ 242 public static final int UNDEFINED_INT = 0; 243 /** The value of Undefined cast to a long */ 244 public static final long UNDEFINED_LONG = 0L; 245 /** The value of Undefined cast to a double */ 246 public static final double UNDEFINED_DOUBLE = Double.NaN; 247 248 /** 249 * Method handles for getters that return undefined coerced 250 * to the appropriate type 251 */ 252 public static final List<MethodHandle> GET_UNDEFINED = toUnmodifiableList( 253 MH.constant(int.class, UNDEFINED_INT), 254 MH.constant(long.class, UNDEFINED_LONG), 255 MH.constant(double.class, UNDEFINED_DOUBLE), 256 MH.constant(Object.class, Undefined.getUndefined()) 257 ); 258 259 private static final double INT32_LIMIT = 4294967296.0; 260 261 /** 262 * Constructor 263 * 264 * @param typeName the type name 265 */ 266 private JSType(final String typeName) { 267 this.typeName = typeName; 268 } 269 270 /** 271 * The external type name as returned by ECMAScript "typeof" operator 272 * 273 * @return type name for this type 274 */ 275 public final String typeName() { 276 return this.typeName; 277 } 278 279 /** 280 * Return the JSType for a given object 281 * 282 * @param obj an object 283 * 284 * @return the JSType for the object 285 */ 286 public static JSType of(final Object obj) { 287 // Order of these statements is tuned for performance (see JDK-8024476) 288 if (obj == null) { 289 return JSType.NULL; 290 } 291 292 if (obj instanceof ScriptObject) { 293 return obj instanceof ScriptFunction ? JSType.FUNCTION : JSType.OBJECT; 294 } 295 296 if (obj instanceof Boolean) { 297 return JSType.BOOLEAN; 298 } 299 300 if (obj instanceof String || obj instanceof ConsString) { 301 return JSType.STRING; 302 } 303 304 if (obj instanceof Number) { 305 return JSType.NUMBER; 306 } 307 308 if (obj == ScriptRuntime.UNDEFINED) { 309 return JSType.UNDEFINED; 310 } 311 312 return Bootstrap.isCallable(obj) ? JSType.FUNCTION : JSType.OBJECT; 313 } 314 315 /** 316 * Similar to {@link #of(Object)}, but does not distinguish between {@link #FUNCTION} and {@link #OBJECT}, returning 317 * {@link #OBJECT} in both cases. The distinction is costly, and the EQ and STRICT_EQ predicates don't care about it 318 * so we maintain this version for their use. 319 * 320 * @param obj an object 321 * 322 * @return the JSType for the object; returns {@link #OBJECT} instead of {@link #FUNCTION} for functions. 323 */ 324 public static JSType ofNoFunction(final Object obj) { 325 // Order of these statements is tuned for performance (see JDK-8024476) 326 if (obj == null) { 327 return JSType.NULL; 328 } 329 330 if (obj instanceof ScriptObject) { 331 return JSType.OBJECT; 332 } 333 334 if (obj instanceof Boolean) { 335 return JSType.BOOLEAN; 336 } 337 338 if (obj instanceof String || obj instanceof ConsString) { 339 return JSType.STRING; 340 } 341 342 if (obj instanceof Number) { 343 return JSType.NUMBER; 344 } 345 346 if (obj == ScriptRuntime.UNDEFINED) { 347 return JSType.UNDEFINED; 348 } 349 350 return JSType.OBJECT; 351 } 352 353 /** 354 * Void return method handle glue 355 */ 356 public static void voidReturn() { 357 //empty 358 //TODO: fix up SetMethodCreator better so we don't need this stupid thing 359 } 360 361 /** 362 * Returns true if double number can be represented as an int 363 * 364 * @param number a long to inspect 365 * 366 * @return true for int representable longs 367 */ 368 public static boolean isRepresentableAsInt(final long number) { 369 return (int)number == number; 370 } 371 372 /** 373 * Returns true if double number can be represented as an int. Note that it returns true for negative zero. If you 374 * need to exclude negative zero, combine this check with {@link #isNegativeZero(double)}. 375 * 376 * @param number a double to inspect 377 * 378 * @return true for int representable doubles 379 */ 380 public static boolean isRepresentableAsInt(final double number) { 381 return (int)number == number; 382 } 383 384 /** 385 * Returns true if Object can be represented as an int 386 * 387 * @param obj an object to inspect 388 * 389 * @return true for int representable objects 390 */ 391 public static boolean isRepresentableAsInt(final Object obj) { 392 if (obj instanceof Number) { 393 return isRepresentableAsInt(((Number)obj).doubleValue()); 394 } 395 return false; 396 } 397 398 /** 399 * Returns true if double number can be represented as a long. Note that it returns true for negative zero. If you 400 * need to exclude negative zero, combine this check with {@link #isNegativeZero(double)}. 401 * 402 * @param number a double to inspect 403 * @return true for long representable doubles 404 */ 405 public static boolean isRepresentableAsLong(final double number) { 406 return (long)number == number; 407 } 408 409 /** 410 * Returns true if Object can be represented as a long 411 * 412 * @param obj an object to inspect 413 * 414 * @return true for long representable objects 415 */ 416 public static boolean isRepresentableAsLong(final Object obj) { 417 if (obj instanceof Number) { 418 return isRepresentableAsLong(((Number)obj).doubleValue()); 419 } 420 return false; 421 } 422 423 /** 424 * Returns true if the number is the negative zero ({@code -0.0d}). 425 * @param number the number to test 426 * @return true if it is the negative zero, false otherwise. 427 */ 428 public static boolean isNegativeZero(final double number) { 429 return number == 0.0d && Double.doubleToRawLongBits(number) == 0x8000000000000000L; 430 } 431 432 /** 433 * Check whether an object is primitive 434 * 435 * @param obj an object 436 * 437 * @return true if object is primitive (includes null and undefined) 438 */ 439 public static boolean isPrimitive(final Object obj) { 440 return obj == null || 441 obj == ScriptRuntime.UNDEFINED || 442 obj instanceof Boolean || 443 obj instanceof Number || 444 obj instanceof String || 445 obj instanceof ConsString; 446 } 447 448 /** 449 * Primitive converter for an object 450 * 451 * @param obj an object 452 * 453 * @return primitive form of the object 454 */ 455 public static Object toPrimitive(final Object obj) { 456 return toPrimitive(obj, null); 457 } 458 459 /** 460 * Primitive converter for an object including type hint 461 * See ECMA 9.1 ToPrimitive 462 * 463 * @param obj an object 464 * @param hint a type hint 465 * 466 * @return the primitive form of the object 467 */ 468 public static Object toPrimitive(final Object obj, final Class<?> hint) { 469 return obj instanceof ScriptObject ? toPrimitive((ScriptObject)obj, hint) : obj; 470 } 471 472 private static Object toPrimitive(final ScriptObject sobj, final Class<?> hint) { 473 final Object result = sobj.getDefaultValue(hint); 474 475 if (!isPrimitive(result)) { 476 throw typeError("bad.default.value", result.toString()); 477 } 478 479 return result; 480 } 481 482 /** 483 * Combines a hintless toPrimitive and a toString call. 484 * 485 * @param obj an object 486 * 487 * @return the string form of the primitive form of the object 488 */ 489 public static String toPrimitiveToString(final Object obj) { 490 return toString(toPrimitive(obj)); 491 } 492 493 /** 494 * Like {@link #toPrimitiveToString(Object)}, but avoids conversion of ConsString to String. 495 * 496 * @param obj an object 497 * @return the CharSequence form of the primitive form of the object 498 */ 499 public static CharSequence toPrimitiveToCharSequence(final Object obj) { 500 return toCharSequence(toPrimitive(obj)); 501 } 502 503 /** 504 * JavaScript compliant conversion of number to boolean 505 * 506 * @param num a number 507 * 508 * @return a boolean 509 */ 510 public static boolean toBoolean(final double num) { 511 return num != 0 && !Double.isNaN(num); 512 } 513 514 /** 515 * JavaScript compliant conversion of Object to boolean 516 * See ECMA 9.2 ToBoolean 517 * 518 * @param obj an object 519 * 520 * @return a boolean 521 */ 522 public static boolean toBoolean(final Object obj) { 523 if (obj instanceof Boolean) { 524 return (Boolean)obj; 525 } 526 527 if (nullOrUndefined(obj)) { 528 return false; 529 } 530 531 if (obj instanceof Number) { 532 final double num = ((Number)obj).doubleValue(); 533 return num != 0 && !Double.isNaN(num); 534 } 535 536 if (obj instanceof String || obj instanceof ConsString) { 537 return ((CharSequence)obj).length() > 0; 538 } 539 540 return true; 541 } 542 543 544 /** 545 * JavaScript compliant converter of Object to String 546 * See ECMA 9.8 ToString 547 * 548 * @param obj an object 549 * 550 * @return a string 551 */ 552 public static String toString(final Object obj) { 553 return toStringImpl(obj, false); 554 } 555 556 /** 557 * If obj is an instance of {@link ConsString} cast to CharSequence, else return 558 * result of {@link #toString(Object)}. 559 * 560 * @param obj an object 561 * @return an instance of String or ConsString 562 */ 563 public static CharSequence toCharSequence(final Object obj) { 564 if (obj instanceof ConsString) { 565 return (CharSequence) obj; 566 } 567 return toString(obj); 568 } 569 570 /** 571 * Check whether a string is representable as a JavaScript number 572 * 573 * @param str a string 574 * 575 * @return true if string can be represented as a number 576 */ 577 public static boolean isNumber(final String str) { 578 try { 579 Double.parseDouble(str); 580 return true; 581 } catch (final NumberFormatException e) { 582 return false; 583 } 584 } 585 586 /** 587 * JavaScript compliant conversion of integer to String 588 * 589 * @param num an integer 590 * 591 * @return a string 592 */ 593 public static String toString(final int num) { 594 return Integer.toString(num); 595 } 596 597 /** 598 * JavaScript compliant conversion of number to String 599 * See ECMA 9.8.1 600 * 601 * @param num a number 602 * 603 * @return a string 604 */ 605 public static String toString(final double num) { 606 if (isRepresentableAsInt(num)) { 607 return Integer.toString((int)num); 608 } 609 610 if (num == Double.POSITIVE_INFINITY) { 611 return "Infinity"; 612 } 613 614 if (num == Double.NEGATIVE_INFINITY) { 615 return "-Infinity"; 616 } 617 618 if (Double.isNaN(num)) { 619 return "NaN"; 620 } 621 622 return NumberToString.stringFor(num); 623 } 624 625 /** 626 * JavaScript compliant conversion of number to String 627 * 628 * @param num a number 629 * @param radix a radix for the conversion 630 * 631 * @return a string 632 */ 633 public static String toString(final double num, final int radix) { 634 assert radix >= 2 && radix <= 36 : "invalid radix"; 635 636 if (isRepresentableAsInt(num)) { 637 return Integer.toString((int)num, radix); 638 } 639 640 if (num == Double.POSITIVE_INFINITY) { 641 return "Infinity"; 642 } 643 644 if (num == Double.NEGATIVE_INFINITY) { 645 return "-Infinity"; 646 } 647 648 if (Double.isNaN(num)) { 649 return "NaN"; 650 } 651 652 if (num == 0.0) { 653 return "0"; 654 } 655 656 final String chars = "0123456789abcdefghijklmnopqrstuvwxyz"; 657 final StringBuilder sb = new StringBuilder(); 658 659 final boolean negative = num < 0.0; 660 final double signedNum = negative ? -num : num; 661 662 double intPart = Math.floor(signedNum); 663 double decPart = signedNum - intPart; 664 665 // encode integer part from least significant digit, then reverse 666 do { 667 final double remainder = intPart % radix; 668 sb.append(chars.charAt((int) remainder)); 669 intPart -= remainder; 670 intPart /= radix; 671 } while (intPart >= 1.0); 672 673 if (negative) { 674 sb.append('-'); 675 } 676 sb.reverse(); 677 678 // encode decimal part 679 if (decPart > 0.0) { 680 final int dot = sb.length(); 681 sb.append('.'); 682 do { 683 decPart *= radix; 684 final double d = Math.floor(decPart); 685 sb.append(chars.charAt((int)d)); 686 decPart -= d; 687 } while (decPart > 0.0 && sb.length() - dot < 1100); 688 // somewhat arbitrarily use same limit as V8 689 } 690 691 return sb.toString(); 692 } 693 694 /** 695 * JavaScript compliant conversion of Object to number 696 * See ECMA 9.3 ToNumber 697 * 698 * @param obj an object 699 * 700 * @return a number 701 */ 702 public static double toNumber(final Object obj) { 703 if (obj instanceof Number) { 704 return ((Number)obj).doubleValue(); 705 } 706 return toNumberGeneric(obj); 707 } 708 709 710 /** 711 * JavaScript compliant conversion of Object to number 712 * See ECMA 9.3 ToNumber 713 * 714 * @param obj an object 715 * 716 * @return a number 717 */ 718 public static double toNumber(final ScriptObject obj) { 719 return toNumber(toPrimitive(obj, Number.class)); 720 } 721 722 /** 723 * Optimistic number conversion - throws UnwarrantedOptimismException if Object 724 * 725 * @param obj object to convert 726 * @param programPoint program point 727 * @return double 728 */ 729 public static double toNumberOptimistic(final Object obj, final int programPoint) { 730 if (obj != null) { 731 final Class<?> clz = obj.getClass(); 732 if (clz == Double.class || clz == Integer.class || clz == Long.class) { 733 return ((Number)obj).doubleValue(); 734 } 735 } 736 throw new UnwarrantedOptimismException(obj, programPoint); 737 } 738 739 /** 740 * Object to number conversion that delegates to either {@link #toNumber(Object)} or to 741 * {@link #toNumberOptimistic(Object, int)} depending on whether the program point is valid or not. 742 * @param obj the object to convert 743 * @param programPoint the program point; can be invalid. 744 * @return the value converted to a number 745 * @throws UnwarrantedOptimismException if the value can't be represented as a number and the program point is valid. 746 */ 747 public static double toNumberMaybeOptimistic(final Object obj, final int programPoint) { 748 return UnwarrantedOptimismException.isValid(programPoint) ? toNumberOptimistic(obj, programPoint) : toNumber(obj); 749 } 750 751 /** 752 * Digit representation for a character 753 * 754 * @param ch a character 755 * @param radix radix 756 * 757 * @return the digit for this character 758 */ 759 public static int digit(final char ch, final int radix) { 760 return digit(ch, radix, false); 761 } 762 763 /** 764 * Digit representation for a character 765 * 766 * @param ch a character 767 * @param radix radix 768 * @param onlyIsoLatin1 iso latin conversion only 769 * 770 * @return the digit for this character 771 */ 772 public static int digit(final char ch, final int radix, final boolean onlyIsoLatin1) { 773 final char maxInRadix = (char)('a' + (radix - 1) - 10); 774 final char c = Character.toLowerCase(ch); 775 776 if (c >= 'a' && c <= maxInRadix) { 777 return Character.digit(ch, radix); 778 } 779 780 if (Character.isDigit(ch)) { 781 if (!onlyIsoLatin1 || ch >= '0' && ch <= '9') { 782 return Character.digit(ch, radix); 783 } 784 } 785 786 return -1; 787 } 788 789 /** 790 * JavaScript compliant String to number conversion 791 * 792 * @param str a string 793 * 794 * @return a number 795 */ 796 public static double toNumber(final String str) { 797 int end = str.length(); 798 if (end == 0) { 799 return 0.0; // Empty string 800 } 801 802 int start = 0; 803 char f = str.charAt(0); 804 805 while (Lexer.isJSWhitespace(f)) { 806 if (++start == end) { 807 return 0.0d; // All whitespace string 808 } 809 f = str.charAt(start); 810 } 811 812 // Guaranteed to terminate even without start >= end check, as the previous loop found at least one 813 // non-whitespace character. 814 while (Lexer.isJSWhitespace(str.charAt(end - 1))) { 815 end--; 816 } 817 818 final boolean negative; 819 if (f == '-') { 820 if(++start == end) { 821 return Double.NaN; // Single-char "-" string 822 } 823 f = str.charAt(start); 824 negative = true; 825 } else { 826 if (f == '+') { 827 if (++start == end) { 828 return Double.NaN; // Single-char "+" string 829 } 830 f = str.charAt(start); 831 } 832 negative = false; 833 } 834 835 final double value; 836 if (start + 1 < end && f == '0' && Character.toLowerCase(str.charAt(start + 1)) == 'x') { 837 //decode hex string 838 value = parseRadix(str.toCharArray(), start + 2, end, 16); 839 } else { 840 // Fast (no NumberFormatException) path to NaN for non-numeric strings. We allow those starting with "I" or 841 // "N" to allow for parsing "NaN" and "Infinity" correctly. 842 if ((f < '0' || f > '9') && f != '.' && f != 'I' && f != 'N') { 843 return Double.NaN; 844 } 845 try { 846 value = Double.parseDouble(str.substring(start, end)); 847 } catch (final NumberFormatException e) { 848 return Double.NaN; 849 } 850 } 851 852 return negative ? -value : value; 853 } 854 855 /** 856 * JavaScript compliant Object to integer conversion. See ECMA 9.4 ToInteger 857 * 858 * <p>Note that this returns {@link java.lang.Integer#MAX_VALUE} or {@link java.lang.Integer#MIN_VALUE} 859 * for double values that exceed the int range, including positive and negative Infinity. It is the 860 * caller's responsibility to handle such values correctly.</p> 861 * 862 * @param obj an object 863 * @return an integer 864 */ 865 public static int toInteger(final Object obj) { 866 return (int)toNumber(obj); 867 } 868 869 /** 870 * Converts an Object to long. 871 * 872 * <p>Note that this returns {@link java.lang.Long#MAX_VALUE} or {@link java.lang.Long#MIN_VALUE} 873 * for double values that exceed the long range, including positive and negative Infinity. It is the 874 * caller's responsibility to handle such values correctly.</p> 875 * 876 * @param obj an object 877 * @return a long 878 */ 879 public static long toLong(final Object obj) { 880 return obj instanceof Long ? ((Long)obj).longValue() : toLong(toNumber(obj)); 881 } 882 883 /** 884 * Converts a double to long. 885 * 886 * @param num the double to convert 887 * @return the converted long value 888 */ 889 public static long toLong(final double num) { 890 return (long)num; 891 } 892 893 /** 894 * Optimistic long conversion - throws UnwarrantedOptimismException if double or Object 895 * 896 * @param obj object to convert 897 * @param programPoint program point 898 * @return long 899 */ 900 public static long toLongOptimistic(final Object obj, final int programPoint) { 901 if (obj != null) { 902 final Class<?> clz = obj.getClass(); 903 if (clz == Long.class || clz == Integer.class) { 904 return ((Number)obj).longValue(); 905 } 906 } 907 throw new UnwarrantedOptimismException(obj, programPoint); 908 } 909 910 /** 911 * Object to int conversion that delegates to either {@link #toLong(Object)} or to 912 * {@link #toLongOptimistic(Object, int)} depending on whether the program point is valid or not. 913 * @param obj the object to convert 914 * @param programPoint the program point; can be invalid. 915 * @return the value converted to long 916 * @throws UnwarrantedOptimismException if the value can't be represented as long and the program point is valid. 917 */ 918 public static long toLongMaybeOptimistic(final Object obj, final int programPoint) { 919 return UnwarrantedOptimismException.isValid(programPoint) ? toLongOptimistic(obj, programPoint) : toLong(obj); 920 } 921 922 /** 923 * JavaScript compliant Object to int32 conversion 924 * See ECMA 9.5 ToInt32 925 * 926 * @param obj an object 927 * @return an int32 928 */ 929 public static int toInt32(final Object obj) { 930 return toInt32(toNumber(obj)); 931 } 932 933 /** 934 * Optimistic int conversion - throws UnwarrantedOptimismException if double, long or Object 935 * 936 * @param obj object to convert 937 * @param programPoint program point 938 * @return double 939 */ 940 public static int toInt32Optimistic(final Object obj, final int programPoint) { 941 if (obj != null && obj.getClass() == Integer.class) { 942 return ((Integer)obj).intValue(); 943 } 944 throw new UnwarrantedOptimismException(obj, programPoint); 945 } 946 947 /** 948 * Object to int conversion that delegates to either {@link #toInt32(Object)} or to 949 * {@link #toInt32Optimistic(Object, int)} depending on whether the program point is valid or not. 950 * @param obj the object to convert 951 * @param programPoint the program point; can be invalid. 952 * @return the value converted to int 953 * @throws UnwarrantedOptimismException if the value can't be represented as int and the program point is valid. 954 */ 955 public static int toInt32MaybeOptimistic(final Object obj, final int programPoint) { 956 return UnwarrantedOptimismException.isValid(programPoint) ? toInt32Optimistic(obj, programPoint) : toInt32(obj); 957 } 958 959 // Minimum and maximum range between which every long value can be precisely represented as a double. 960 private static final long MAX_PRECISE_DOUBLE = 1L << 53; 961 private static final long MIN_PRECISE_DOUBLE = -MAX_PRECISE_DOUBLE; 962 963 /** 964 * JavaScript compliant long to int32 conversion 965 * 966 * @param num a long 967 * @return an int32 968 */ 969 public static int toInt32(final long num) { 970 return (int)(num >= MIN_PRECISE_DOUBLE && num <= MAX_PRECISE_DOUBLE ? num : (long)(num % INT32_LIMIT)); 971 } 972 973 974 /** 975 * JavaScript compliant number to int32 conversion 976 * 977 * @param num a number 978 * @return an int32 979 */ 980 public static int toInt32(final double num) { 981 return (int)doubleToInt32(num); 982 } 983 984 /** 985 * JavaScript compliant Object to uint32 conversion 986 * 987 * @param obj an object 988 * @return a uint32 989 */ 990 public static long toUint32(final Object obj) { 991 return toUint32(toNumber(obj)); 992 } 993 994 /** 995 * JavaScript compliant number to uint32 conversion 996 * 997 * @param num a number 998 * @return a uint32 999 */ 1000 public static long toUint32(final double num) { 1001 return doubleToInt32(num) & MAX_UINT; 1002 } 1003 1004 /** 1005 * JavaScript compliant Object to uint16 conversion 1006 * ECMA 9.7 ToUint16: (Unsigned 16 Bit Integer) 1007 * 1008 * @param obj an object 1009 * @return a uint16 1010 */ 1011 public static int toUint16(final Object obj) { 1012 return toUint16(toNumber(obj)); 1013 } 1014 1015 /** 1016 * JavaScript compliant number to uint16 conversion 1017 * 1018 * @param num a number 1019 * @return a uint16 1020 */ 1021 public static int toUint16(final int num) { 1022 return num & 0xffff; 1023 } 1024 1025 /** 1026 * JavaScript compliant number to uint16 conversion 1027 * 1028 * @param num a number 1029 * @return a uint16 1030 */ 1031 public static int toUint16(final long num) { 1032 return (int)num & 0xffff; 1033 } 1034 1035 /** 1036 * JavaScript compliant number to uint16 conversion 1037 * 1038 * @param num a number 1039 * @return a uint16 1040 */ 1041 public static int toUint16(final double num) { 1042 return (int)doubleToInt32(num) & 0xffff; 1043 } 1044 1045 private static long doubleToInt32(final double num) { 1046 final int exponent = Math.getExponent(num); 1047 if (exponent < 31) { 1048 return (long) num; // Fits into 32 bits 1049 } 1050 if (exponent >= 84) { 1051 // Either infinite or NaN or so large that shift / modulo will produce 0 1052 // (52 bit mantissa + 32 bit target width). 1053 return 0; 1054 } 1055 // This is rather slow and could probably be sped up using bit-fiddling. 1056 final double d = num >= 0 ? Math.floor(num) : Math.ceil(num); 1057 return (long)(d % INT32_LIMIT); 1058 } 1059 1060 /** 1061 * Check whether a number is finite 1062 * 1063 * @param num a number 1064 * @return true if finite 1065 */ 1066 public static boolean isFinite(final double num) { 1067 return !Double.isInfinite(num) && !Double.isNaN(num); 1068 } 1069 1070 /** 1071 * Convert a primitive to a double 1072 * 1073 * @param num a double 1074 * @return a boxed double 1075 */ 1076 public static Double toDouble(final double num) { 1077 return num; 1078 } 1079 1080 /** 1081 * Convert a primitive to a double 1082 * 1083 * @param num a long 1084 * @return a boxed double 1085 */ 1086 public static Double toDouble(final long num) { 1087 return (double)num; 1088 } 1089 1090 /** 1091 * Convert a primitive to a double 1092 * 1093 * @param num an int 1094 * @return a boxed double 1095 */ 1096 public static Double toDouble(final int num) { 1097 return (double)num; 1098 } 1099 1100 /** 1101 * Convert a boolean to an Object 1102 * 1103 * @param bool a boolean 1104 * @return a boxed boolean, its Object representation 1105 */ 1106 public static Object toObject(final boolean bool) { 1107 return bool; 1108 } 1109 1110 /** 1111 * Convert a number to an Object 1112 * 1113 * @param num an integer 1114 * @return the boxed number 1115 */ 1116 public static Object toObject(final int num) { 1117 return num; 1118 } 1119 1120 /** 1121 * Convert a number to an Object 1122 * 1123 * @param num a long 1124 * @return the boxed number 1125 */ 1126 public static Object toObject(final long num) { 1127 return num; 1128 } 1129 1130 /** 1131 * Convert a number to an Object 1132 * 1133 * @param num a double 1134 * @return the boxed number 1135 */ 1136 public static Object toObject(final double num) { 1137 return num; 1138 } 1139 1140 /** 1141 * Identity converter for objects. 1142 * 1143 * @param obj an object 1144 * @return the boxed number 1145 */ 1146 public static Object toObject(final Object obj) { 1147 return obj; 1148 } 1149 1150 /** 1151 * Object conversion. This is used to convert objects and numbers to their corresponding 1152 * NativeObject type 1153 * See ECMA 9.9 ToObject 1154 * 1155 * @param obj the object to convert 1156 * 1157 * @return the wrapped object 1158 */ 1159 public static Object toScriptObject(final Object obj) { 1160 return toScriptObject(Context.getGlobal(), obj); 1161 } 1162 1163 /** 1164 * Object conversion. This is used to convert objects and numbers to their corresponding 1165 * NativeObject type 1166 * See ECMA 9.9 ToObject 1167 * 1168 * @param global the global object 1169 * @param obj the object to convert 1170 * 1171 * @return the wrapped object 1172 */ 1173 public static Object toScriptObject(final Global global, final Object obj) { 1174 if (nullOrUndefined(obj)) { 1175 throw typeError(global, "not.an.object", ScriptRuntime.safeToString(obj)); 1176 } 1177 1178 if (obj instanceof ScriptObject) { 1179 return obj; 1180 } 1181 1182 return global.wrapAsObject(obj); 1183 } 1184 1185 /** 1186 * Script object to Java array conversion. 1187 * 1188 * @param obj script object to be converted to Java array 1189 * @param componentType component type of the destination array required 1190 * @return converted Java array 1191 */ 1192 public static Object toJavaArray(final Object obj, final Class<?> componentType) { 1193 if (obj instanceof ScriptObject) { 1194 return ((ScriptObject)obj).getArray().asArrayOfType(componentType); 1195 } else if (obj instanceof JSObject) { 1196 final ArrayLikeIterator<?> itr = ArrayLikeIterator.arrayLikeIterator(obj); 1197 final int len = (int) itr.getLength(); 1198 final Object[] res = new Object[len]; 1199 int idx = 0; 1200 while (itr.hasNext()) { 1201 res[idx++] = itr.next(); 1202 } 1203 return convertArray(res, componentType); 1204 } else if(obj == null) { 1205 return null; 1206 } else { 1207 throw new IllegalArgumentException("not a script object"); 1208 } 1209 } 1210 1211 /** 1212 * Java array to java array conversion - but using type conversions implemented by linker. 1213 * 1214 * @param src source array 1215 * @param componentType component type of the destination array required 1216 * @return converted Java array 1217 */ 1218 public static Object convertArray(final Object[] src, final Class<?> componentType) { 1219 if(componentType == Object.class) { 1220 for(int i = 0; i < src.length; ++i) { 1221 final Object e = src[i]; 1222 if(e instanceof ConsString) { 1223 src[i] = e.toString(); 1224 } 1225 } 1226 } 1227 1228 final int l = src.length; 1229 final Object dst = Array.newInstance(componentType, l); 1230 final MethodHandle converter = Bootstrap.getLinkerServices().getTypeConverter(Object.class, componentType); 1231 try { 1232 for (int i = 0; i < src.length; i++) { 1233 Array.set(dst, i, invoke(converter, src[i])); 1234 } 1235 } catch (final RuntimeException | Error e) { 1236 throw e; 1237 } catch (final Throwable t) { 1238 throw new RuntimeException(t); 1239 } 1240 return dst; 1241 } 1242 1243 /** 1244 * Converts a JavaScript object to a Java List. See {@link ListAdapter} for details. 1245 * @param obj the object to convert. Can be any array-like object. 1246 * @return a List that is live-backed by the JavaScript object. 1247 */ 1248 public static List<?> toJavaList(final Object obj) { 1249 return ListAdapter.create(obj); 1250 } 1251 1252 /** 1253 * Converts a JavaScript object to a Java Deque. See {@link ListAdapter} for details. 1254 * @param obj the object to convert. Can be any array-like object. 1255 * @return a Deque that is live-backed by the JavaScript object. 1256 */ 1257 public static Deque<?> toJavaDeque(final Object obj) { 1258 return ListAdapter.create(obj); 1259 } 1260 1261 /** 1262 * Check if an object is null or undefined 1263 * 1264 * @param obj object to check 1265 * 1266 * @return true if null or undefined 1267 */ 1268 public static boolean nullOrUndefined(final Object obj) { 1269 return obj == null || obj == ScriptRuntime.UNDEFINED; 1270 } 1271 1272 static String toStringImpl(final Object obj, final boolean safe) { 1273 if (obj instanceof String) { 1274 return (String)obj; 1275 } 1276 1277 if (obj instanceof Number) { 1278 return toString(((Number)obj).doubleValue()); 1279 } 1280 1281 if (obj == ScriptRuntime.UNDEFINED) { 1282 return "undefined"; 1283 } 1284 1285 if (obj == null) { 1286 return "null"; 1287 } 1288 1289 if (obj instanceof ScriptObject) { 1290 if (safe) { 1291 final ScriptObject sobj = (ScriptObject)obj; 1292 final Global gobj = Context.getGlobal(); 1293 return gobj.isError(sobj) ? 1294 ECMAException.safeToString(sobj) : 1295 sobj.safeToString(); 1296 } 1297 1298 return toString(toPrimitive(obj, String.class)); 1299 } 1300 1301 if (obj instanceof StaticClass) { 1302 return "[JavaClass " + ((StaticClass)obj).getRepresentedClass().getName() + "]"; 1303 } 1304 1305 return obj.toString(); 1306 } 1307 1308 // trim from left for JS whitespaces. 1309 static String trimLeft(final String str) { 1310 int start = 0; 1311 1312 while (start < str.length() && Lexer.isJSWhitespace(str.charAt(start))) { 1313 start++; 1314 } 1315 1316 return str.substring(start); 1317 } 1318 1319 /** 1320 * Throw an unwarranted optimism exception for a program point 1321 * @param value real return value 1322 * @param programPoint program point 1323 * @return 1324 */ 1325 @SuppressWarnings("unused") 1326 private static Object throwUnwarrantedOptimismException(final Object value, final int programPoint) { 1327 throw new UnwarrantedOptimismException(value, programPoint); 1328 } 1329 1330 /** 1331 * Wrapper for addExact 1332 * 1333 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1334 * containing the result and the program point of the failure 1335 * 1336 * @param x first term 1337 * @param y second term 1338 * @param programPoint program point id 1339 * @return the result 1340 * @throws UnwarrantedOptimismException if overflow occurs 1341 */ 1342 public static int addExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1343 try { 1344 return Math.addExact(x, y); 1345 } catch (final ArithmeticException e) { 1346 throw new UnwarrantedOptimismException((long)x + (long)y, programPoint); 1347 } 1348 } 1349 1350 /** 1351 * Wrapper for addExact 1352 * 1353 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1354 * containing the result and the program point of the failure 1355 * 1356 * @param x first term 1357 * @param y second term 1358 * @param programPoint program point id 1359 * @return the result 1360 * @throws UnwarrantedOptimismException if overflow occurs 1361 */ 1362 public static long addExact(final long x, final long y, final int programPoint) throws UnwarrantedOptimismException { 1363 try { 1364 return Math.addExact(x, y); 1365 } catch (final ArithmeticException e) { 1366 throw new UnwarrantedOptimismException((double)x + (double)y, programPoint); 1367 } 1368 } 1369 1370 /** 1371 * Wrapper for subExact 1372 * 1373 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1374 * containing the result and the program point of the failure 1375 * 1376 * @param x first term 1377 * @param y second term 1378 * @param programPoint program point id 1379 * @return the result 1380 * @throws UnwarrantedOptimismException if overflow occurs 1381 */ 1382 public static int subExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1383 try { 1384 return Math.subtractExact(x, y); 1385 } catch (final ArithmeticException e) { 1386 throw new UnwarrantedOptimismException((long)x - (long)y, programPoint); 1387 } 1388 } 1389 1390 /** 1391 * Wrapper for subExact 1392 * 1393 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1394 * containing the result and the program point of the failure 1395 * 1396 * @param x first term 1397 * @param y second term 1398 * @param programPoint program point id 1399 * @return the result 1400 * @throws UnwarrantedOptimismException if overflow occurs 1401 */ 1402 public static long subExact(final long x, final long y, final int programPoint) throws UnwarrantedOptimismException { 1403 try { 1404 return Math.subtractExact(x, y); 1405 } catch (final ArithmeticException e) { 1406 throw new UnwarrantedOptimismException((double)x - (double)y, programPoint); 1407 } 1408 } 1409 1410 /** 1411 * Wrapper for mulExact 1412 * 1413 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1414 * containing the result and the program point of the failure 1415 * 1416 * @param x first term 1417 * @param y second term 1418 * @param programPoint program point id 1419 * @return the result 1420 * @throws UnwarrantedOptimismException if overflow occurs 1421 */ 1422 public static int mulExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1423 try { 1424 return Math.multiplyExact(x, y); 1425 } catch (final ArithmeticException e) { 1426 throw new UnwarrantedOptimismException((long)x * (long)y, programPoint); 1427 } 1428 } 1429 1430 /** 1431 * Wrapper for mulExact 1432 * 1433 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1434 * containing the result and the program point of the failure 1435 * 1436 * @param x first term 1437 * @param y second term 1438 * @param programPoint program point id 1439 * @return the result 1440 * @throws UnwarrantedOptimismException if overflow occurs 1441 */ 1442 public static long mulExact(final long x, final long y, final int programPoint) throws UnwarrantedOptimismException { 1443 try { 1444 return Math.multiplyExact(x, y); 1445 } catch (final ArithmeticException e) { 1446 throw new UnwarrantedOptimismException((double)x * (double)y, programPoint); 1447 } 1448 } 1449 1450 /** 1451 * Wrapper for divExact. Throws UnwarrantedOptimismException if the result of the division can't be represented as 1452 * int. 1453 * 1454 * @param x first term 1455 * @param y second term 1456 * @param programPoint program point id 1457 * @return the result 1458 * @throws UnwarrantedOptimismException if the result of the division can't be represented as int. 1459 */ 1460 public static int divExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1461 final int res; 1462 try { 1463 res = x / y; 1464 } catch (final ArithmeticException e) { 1465 assert y == 0; // Only div by zero anticipated 1466 throw new UnwarrantedOptimismException(x > 0 ? Double.POSITIVE_INFINITY : x < 0 ? Double.NEGATIVE_INFINITY : Double.NaN, programPoint); 1467 } 1468 final int rem = x % y; 1469 if (rem == 0) { 1470 return res; 1471 } 1472 // go directly to double here, as anything with non zero remainder is a floating point number in JavaScript 1473 throw new UnwarrantedOptimismException((double)x / (double)y, programPoint); 1474 } 1475 1476 /** 1477 * Wrapper for modExact. Throws UnwarrantedOptimismException if the modulo can't be represented as int. 1478 * 1479 * @param x first term 1480 * @param y second term 1481 * @param programPoint program point id 1482 * @return the result 1483 * @throws UnwarrantedOptimismException if the modulo can't be represented as int. 1484 */ 1485 public static int remExact(final int x, final int y, final int programPoint) throws UnwarrantedOptimismException { 1486 try { 1487 return x % y; 1488 } catch (final ArithmeticException e) { 1489 assert y == 0; // Only mod by zero anticipated 1490 throw new UnwarrantedOptimismException(Double.NaN, programPoint); 1491 } 1492 } 1493 1494 /** 1495 * Wrapper for divExact. Throws UnwarrantedOptimismException if the result of the division can't be represented as 1496 * long. 1497 * 1498 * @param x first term 1499 * @param y second term 1500 * @param programPoint program point id 1501 * @return the result 1502 * @throws UnwarrantedOptimismException if the result of the division can't be represented as long. 1503 */ 1504 public static long divExact(final long x, final long y, final int programPoint) throws UnwarrantedOptimismException { 1505 final long res; 1506 try { 1507 res = x / y; 1508 } catch (final ArithmeticException e) { 1509 assert y == 0L; // Only div by zero anticipated 1510 throw new UnwarrantedOptimismException(x > 0L ? Double.POSITIVE_INFINITY : x < 0L ? Double.NEGATIVE_INFINITY : Double.NaN, programPoint); 1511 } 1512 final long rem = x % y; 1513 if (rem == 0L) { 1514 return res; 1515 } 1516 throw new UnwarrantedOptimismException((double)x / (double)y, programPoint); 1517 } 1518 1519 /** 1520 * Wrapper for modExact. Throws UnwarrantedOptimismException if the modulo can't be represented as int. 1521 * 1522 * @param x first term 1523 * @param y second term 1524 * @param programPoint program point id 1525 * @return the result 1526 * @throws UnwarrantedOptimismException if the modulo can't be represented as int. 1527 */ 1528 public static long remExact(final long x, final long y, final int programPoint) throws UnwarrantedOptimismException { 1529 try { 1530 return x % y; 1531 } catch (final ArithmeticException e) { 1532 assert y == 0L; // Only mod by zero anticipated 1533 throw new UnwarrantedOptimismException(Double.NaN, programPoint); 1534 } 1535 } 1536 1537 /** 1538 * Wrapper for decrementExact 1539 * 1540 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1541 * containing the result and the program point of the failure 1542 * 1543 * @param x number to negate 1544 * @param programPoint program point id 1545 * @return the result 1546 * @throws UnwarrantedOptimismException if overflow occurs 1547 */ 1548 public static int decrementExact(final int x, final int programPoint) throws UnwarrantedOptimismException { 1549 try { 1550 return Math.decrementExact(x); 1551 } catch (final ArithmeticException e) { 1552 throw new UnwarrantedOptimismException((long)x - 1, programPoint); 1553 } 1554 } 1555 1556 /** 1557 * Wrapper for decrementExact 1558 * 1559 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1560 * containing the result and the program point of the failure 1561 * 1562 * @param x number to negate 1563 * @param programPoint program point id 1564 * @return the result 1565 * @throws UnwarrantedOptimismException if overflow occurs 1566 */ 1567 public static long decrementExact(final long x, final int programPoint) throws UnwarrantedOptimismException { 1568 try { 1569 return Math.decrementExact(x); 1570 } catch (final ArithmeticException e) { 1571 throw new UnwarrantedOptimismException((double)x - 1L, programPoint); 1572 } 1573 } 1574 1575 /** 1576 * Wrapper for incrementExact 1577 * 1578 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1579 * containing the result and the program point of the failure 1580 * 1581 * @param x the number to increment 1582 * @param programPoint program point id 1583 * @return the result 1584 * @throws UnwarrantedOptimismException if overflow occurs 1585 */ 1586 public static int incrementExact(final int x, final int programPoint) throws UnwarrantedOptimismException { 1587 try { 1588 return Math.incrementExact(x); 1589 } catch (final ArithmeticException e) { 1590 throw new UnwarrantedOptimismException((long)x + 1, programPoint); 1591 } 1592 } 1593 1594 /** 1595 * Wrapper for incrementExact 1596 * 1597 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1598 * containing the result and the program point of the failure 1599 * 1600 * @param x the number to increment 1601 * @param programPoint program point id 1602 * @return the result 1603 * @throws UnwarrantedOptimismException if overflow occurs 1604 */ 1605 public static long incrementExact(final long x, final int programPoint) throws UnwarrantedOptimismException { 1606 try { 1607 return Math.incrementExact(x); 1608 } catch (final ArithmeticException e) { 1609 throw new UnwarrantedOptimismException((double)x + 1L, programPoint); 1610 } 1611 } 1612 1613 /** 1614 * Wrapper for negateExact 1615 * 1616 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1617 * containing the result and the program point of the failure 1618 * 1619 * @param x the number to negate 1620 * @param programPoint program point id 1621 * @return the result 1622 * @throws UnwarrantedOptimismException if overflow occurs 1623 */ 1624 public static int negateExact(final int x, final int programPoint) throws UnwarrantedOptimismException { 1625 try { 1626 if (x == 0) { 1627 throw new UnwarrantedOptimismException(-0.0, programPoint); 1628 } 1629 return Math.negateExact(x); 1630 } catch (final ArithmeticException e) { 1631 throw new UnwarrantedOptimismException(-(long)x, programPoint); 1632 } 1633 } 1634 1635 /** 1636 * Wrapper for negateExact 1637 * 1638 * Catches ArithmeticException and rethrows as UnwarrantedOptimismException 1639 * containing the result and the program point of the failure 1640 * 1641 * @param x the number to negate 1642 * @param programPoint program point id 1643 * @return the result 1644 * @throws UnwarrantedOptimismException if overflow occurs 1645 */ 1646 public static long negateExact(final long x, final int programPoint) throws UnwarrantedOptimismException { 1647 try { 1648 if (x == 0L) { 1649 throw new UnwarrantedOptimismException(-0.0, programPoint); 1650 } 1651 return Math.negateExact(x); 1652 } catch (final ArithmeticException e) { 1653 throw new UnwarrantedOptimismException(-(double)x, programPoint); 1654 } 1655 } 1656 1657 /** 1658 * Given a type of an accessor, return its index in [0..getNumberOfAccessorTypes()) 1659 * 1660 * @param type the type 1661 * 1662 * @return the accessor index, or -1 if no accessor of this type exists 1663 */ 1664 public static int getAccessorTypeIndex(final Type type) { 1665 return getAccessorTypeIndex(type.getTypeClass()); 1666 } 1667 1668 /** 1669 * Given a class of an accessor, return its index in [0..getNumberOfAccessorTypes()) 1670 * 1671 * Note that this is hardcoded with respect to the dynamic contents of the accessor 1672 * types array for speed. Hotspot got stuck with this as 5% of the runtime in 1673 * a benchmark when it looped over values and increased an index counter. :-( 1674 * 1675 * @param type the type 1676 * 1677 * @return the accessor index, or -1 if no accessor of this type exists 1678 */ 1679 public static int getAccessorTypeIndex(final Class<?> type) { 1680 if (type == null) { 1681 return TYPE_UNDEFINED_INDEX; 1682 } else if (type == int.class) { 1683 return TYPE_INT_INDEX; 1684 } else if (type == long.class) { 1685 return TYPE_LONG_INDEX; 1686 } else if (type == double.class) { 1687 return TYPE_DOUBLE_INDEX; 1688 } else if (!type.isPrimitive()) { 1689 return TYPE_OBJECT_INDEX; 1690 } 1691 return -1; 1692 } 1693 1694 /** 1695 * Return the accessor type based on its index in [0..getNumberOfAccessorTypes()) 1696 * Indexes are ordered narrower{@literal ->}wider / optimistic{@literal ->}pessimistic. Invalidations always 1697 * go to a type of higher index 1698 * 1699 * @param index accessor type index 1700 * 1701 * @return a type corresponding to the index. 1702 */ 1703 1704 public static Type getAccessorType(final int index) { 1705 return ACCESSOR_TYPES.get(index); 1706 } 1707 1708 /** 1709 * Return the number of accessor types available. 1710 * 1711 * @return number of accessor types in system 1712 */ 1713 public static int getNumberOfAccessorTypes() { 1714 return ACCESSOR_TYPES.size(); 1715 } 1716 1717 private static double parseRadix(final char chars[], final int start, final int length, final int radix) { 1718 int pos = 0; 1719 1720 for (int i = start; i < length ; i++) { 1721 if (digit(chars[i], radix) == -1) { 1722 return Double.NaN; 1723 } 1724 pos++; 1725 } 1726 1727 if (pos == 0) { 1728 return Double.NaN; 1729 } 1730 1731 double value = 0.0; 1732 for (int i = start; i < start + pos; i++) { 1733 value *= radix; 1734 value += digit(chars[i], radix); 1735 } 1736 1737 return value; 1738 } 1739 1740 private static double toNumberGeneric(final Object obj) { 1741 if (obj == null) { 1742 return +0.0; 1743 } 1744 1745 if (obj instanceof String) { 1746 return toNumber((String)obj); 1747 } 1748 1749 if (obj instanceof ConsString) { 1750 return toNumber(obj.toString()); 1751 } 1752 1753 if (obj instanceof Boolean) { 1754 return (Boolean)obj ? 1 : +0.0; 1755 } 1756 1757 if (obj instanceof ScriptObject) { 1758 return toNumber((ScriptObject)obj); 1759 } 1760 1761 if (obj instanceof JSObject) { 1762 return ((JSObject)obj).toNumber(); 1763 } 1764 1765 return Double.NaN; 1766 } 1767 1768 private static Object invoke(final MethodHandle mh, final Object arg) { 1769 try { 1770 return mh.invoke(arg); 1771 } catch (final RuntimeException | Error e) { 1772 throw e; 1773 } catch (final Throwable t) { 1774 throw new RuntimeException(t); 1775 } 1776 } 1777 1778 /** 1779 * Create a method handle constant of the correct primitive type 1780 * for a constant object 1781 * @param o object 1782 * @return constant function that returns object 1783 */ 1784 public static MethodHandle unboxConstant(final Object o) { 1785 if (o != null) { 1786 if (o.getClass() == Integer.class) { 1787 return MH.constant(int.class, ((Integer)o).intValue()); 1788 } else if (o.getClass() == Long.class) { 1789 return MH.constant(long.class, ((Long)o).longValue()); 1790 } else if (o.getClass() == Double.class) { 1791 return MH.constant(double.class, ((Double)o).doubleValue()); 1792 } 1793 } 1794 return MH.constant(Object.class, o); 1795 } 1796 1797 /** 1798 * Get the unboxed (primitive) type for an object 1799 * @param o object 1800 * @return primive type or Object.class if not primitive 1801 */ 1802 public static Class<?> unboxedFieldType(final Object o) { 1803 if (OBJECT_FIELDS_ONLY) { 1804 return Object.class; 1805 } 1806 1807 if (o == null) { 1808 return Object.class; 1809 } else if (o.getClass() == Integer.class) { 1810 return int.class; 1811 } else if (o.getClass() == Long.class) { 1812 return long.class; 1813 } else if (o.getClass() == Double.class) { 1814 return double.class; 1815 } else { 1816 return Object.class; 1817 } 1818 } 1819 1820 private static final List<MethodHandle> toUnmodifiableList(final MethodHandle... methodHandles) { 1821 return Collections.unmodifiableList(Arrays.asList(methodHandles)); 1822 } 1823} 1824