DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "builtin/Object.h"

#include "mozilla/ArrayUtils.h"

#include "jscntxt.h"

#include "builtin/Eval.h"
#include "frontend/BytecodeCompiler.h"
#include "jit/InlinableNatives.h"
#include "js/UniquePtr.h"
#include "vm/StringBuffer.h"

#include "jsobjinlines.h"

#include "vm/NativeObject-inl.h"
#include "vm/Shape-inl.h"

using namespace js;

using js::frontend::IsIdentifier;
using mozilla::ArrayLength;

bool
js::obj_construct(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    RootedObject obj(cx, nullptr);
    if (args.isConstructing() && (&args.newTarget().toObject() != &args.callee())) {
        RootedObject newTarget(cx, &args.newTarget().toObject());
        obj = CreateThis(cx, &PlainObject::class_, newTarget);
        if (!obj)
            return false;
    } else if (args.length() > 0 && !args[0].isNullOrUndefined()) {
        obj = ToObject(cx, args[0]);
        if (!obj)
            return false;
    } else {
        /* Make an object whether this was called with 'new' or not. */
        if (!NewObjectScriptedCall(cx, &obj))
            return false;
    }

    args.rval().setObject(*obj);
    return true;
}

/* ES5 15.2.4.7. */
bool
js::obj_propertyIsEnumerable(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    HandleValue idValue = args.get(0);

    // As an optimization, provide a fast path when rooting is not necessary and
    // we can safely retrieve the attributes from the object's shape.

    /* Steps 1-2. */
    jsid id;
    if (args.thisv().isObject() && ValueToId<NoGC>(cx, idValue, &id)) {
        JSObject* obj = &args.thisv().toObject();

        /* Step 3. */
        Shape* shape;
        if (obj->isNative() &&
            NativeLookupOwnProperty<NoGC>(cx, &obj->as<NativeObject>(), id, &shape))
        {
            /* Step 4. */
            if (!shape) {
                args.rval().setBoolean(false);
                return true;
            }

            /* Step 5. */
            unsigned attrs = GetShapeAttributes(obj, shape);
            args.rval().setBoolean((attrs & JSPROP_ENUMERATE) != 0);
            return true;
        }
    }

    /* Step 1. */
    RootedId idRoot(cx);
    if (!ToPropertyKey(cx, idValue, &idRoot))
        return false;

    /* Step 2. */
    RootedObject obj(cx, ToObject(cx, args.thisv()));
    if (!obj)
        return false;

    /* Step 3. */
    Rooted<PropertyDescriptor> desc(cx);
    if (!GetOwnPropertyDescriptor(cx, obj, idRoot, &desc))
        return false;

    /* Steps 4-5. */
    args.rval().setBoolean(desc.object() && desc.enumerable());
    return true;
}

#if JS_HAS_TOSOURCE
static bool
obj_toSource(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    JS_CHECK_RECURSION(cx, return false);

    RootedObject obj(cx, ToObject(cx, args.thisv()));
    if (!obj)
        return false;

    JSString* str = ObjectToSource(cx, obj);
    if (!str)
        return false;

    args.rval().setString(str);
    return true;
}

/*
 * Given a function source string, return the offset and length of the part
 * between '(function $name' and ')'.
 */
template <typename CharT>
static bool
ArgsAndBodySubstring(mozilla::Range<const CharT> chars, size_t* outOffset, size_t* outLen)
{
    const CharT* const start = chars.start().get();
    const CharT* const end = chars.end().get();
    const CharT* s = start;

    uint8_t parenChomp = 0;
    if (s[0] == '(') {
        s++;
        parenChomp = 1;
    }

    /* Try to jump "function" keyword. */
    s = js_strchr_limit(s, ' ', end);
    if (!s)
        return false;

    /*
     * Jump over the function's name: it can't be encoded as part
     * of an ECMA getter or setter.
     */
    s = js_strchr_limit(s, '(', end);
    if (!s)
        return false;

    if (*s == ' ')
        s++;

    *outOffset = s - start;
    *outLen = end - s - parenChomp;
    MOZ_ASSERT(*outOffset + *outLen <= chars.length());
    return true;
}

JSString*
js::ObjectToSource(JSContext* cx, HandleObject obj)
{
    /* If outermost, we need parentheses to be an expression, not a block. */
    bool outermost = (cx->cycleDetectorSet.count() == 0);

    AutoCycleDetector detector(cx, obj);
    if (!detector.init())
        return nullptr;
    if (detector.foundCycle())
        return NewStringCopyZ<CanGC>(cx, "{}");

    StringBuffer buf(cx);
    if (outermost && !buf.append('('))
        return nullptr;
    if (!buf.append('{'))
        return nullptr;

    RootedValue v0(cx), v1(cx);
    MutableHandleValue val[2] = {&v0, &v1};

    RootedString str0(cx), str1(cx);
    MutableHandleString gsop[2] = {&str0, &str1};

    AutoIdVector idv(cx);
    if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY | JSITER_SYMBOLS, &idv))
        return nullptr;

    bool comma = false;
    for (size_t i = 0; i < idv.length(); ++i) {
        RootedId id(cx, idv[i]);
        Rooted<PropertyDescriptor> desc(cx);
        if (!GetOwnPropertyDescriptor(cx, obj, id, &desc))
            return nullptr;

        int valcnt = 0;
        if (desc.object()) {
            if (desc.isAccessorDescriptor()) {
                if (desc.hasGetterObject() && desc.getterObject()) {
                    val[valcnt].setObject(*desc.getterObject());
                    gsop[valcnt].set(cx->names().get);
                    valcnt++;
                }
                if (desc.hasSetterObject() && desc.setterObject()) {
                    val[valcnt].setObject(*desc.setterObject());
                    gsop[valcnt].set(cx->names().set);
                    valcnt++;
                }
            } else {
                valcnt = 1;
                val[0].set(desc.value());
                gsop[0].set(nullptr);
            }
        }

        /* Convert id to a string. */
        RootedString idstr(cx);
        if (JSID_IS_SYMBOL(id)) {
            RootedValue v(cx, SymbolValue(JSID_TO_SYMBOL(id)));
            idstr = ValueToSource(cx, v);
            if (!idstr)
                return nullptr;
        } else {
            RootedValue idv(cx, IdToValue(id));
            idstr = ToString<CanGC>(cx, idv);
            if (!idstr)
                return nullptr;

            /*
             * If id is a string that's not an identifier, or if it's a negative
             * integer, then it must be quoted.
             */
            if (JSID_IS_ATOM(id)
                ? !IsIdentifier(JSID_TO_ATOM(id))
                : JSID_TO_INT(id) < 0)
            {
                idstr = QuoteString(cx, idstr, char16_t('\''));
                if (!idstr)
                    return nullptr;
            }
        }

        for (int j = 0; j < valcnt; j++) {
            /* Convert val[j] to its canonical source form. */
            JSString* valsource = ValueToSource(cx, val[j]);
            if (!valsource)
                return nullptr;

            RootedLinearString valstr(cx, valsource->ensureLinear(cx));
            if (!valstr)
                return nullptr;

            size_t voffset = 0;
            size_t vlength = valstr->length();

            /*
             * Remove '(function ' from the beginning of valstr and ')' from the
             * end so that we can put "get" in front of the function definition.
             */
            if (gsop[j] && IsFunctionObject(val[j])) {
                bool success;
                JS::AutoCheckCannotGC nogc;
                if (valstr->hasLatin1Chars())
                    success = ArgsAndBodySubstring(valstr->latin1Range(nogc), &voffset, &vlength);
                else
                    success = ArgsAndBodySubstring(valstr->twoByteRange(nogc), &voffset, &vlength);
                if (!success)
                    gsop[j].set(nullptr);
            }

            if (comma && !buf.append(", "))
                return nullptr;
            comma = true;

            if (gsop[j]) {
                if (!buf.append(gsop[j]) || !buf.append(' '))
                    return nullptr;
            }
            if (JSID_IS_SYMBOL(id) && !buf.append('['))
                return nullptr;
            if (!buf.append(idstr))
                return nullptr;
            if (JSID_IS_SYMBOL(id) && !buf.append(']'))
                return nullptr;
            if (!buf.append(gsop[j] ? ' ' : ':'))
                return nullptr;

            if (!buf.appendSubstring(valstr, voffset, vlength))
                return nullptr;
        }
    }

    if (!buf.append('}'))
        return nullptr;
    if (outermost && !buf.append(')'))
        return nullptr;

    return buf.finishString();
}
#endif /* JS_HAS_TOSOURCE */

JSString*
JS_BasicObjectToString(JSContext* cx, HandleObject obj)
{
    // Some classes are really common, don't allocate new strings for them.
    // The ordering below is based on the measurements in bug 966264.
    if (obj->is<PlainObject>())
        return cx->names().objectObject;
    if (obj->is<StringObject>())
        return cx->names().objectString;
    if (obj->is<ArrayObject>())
        return cx->names().objectArray;
    if (obj->is<JSFunction>())
        return cx->names().objectFunction;
    if (obj->is<NumberObject>())
        return cx->names().objectNumber;

    const char* className = GetObjectClassName(cx, obj);

    if (strcmp(className, "Window") == 0)
        return cx->names().objectWindow;

    StringBuffer sb(cx);
    if (!sb.append("[object ") || !sb.append(className, strlen(className)) ||
        !sb.append("]"))
    {
        return nullptr;
    }
    return sb.finishString();
}

/* ES5 15.2.4.2.  Note steps 1 and 2 are errata. */
bool
js::obj_toString(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    /* Step 1. */
    if (args.thisv().isUndefined()) {
        args.rval().setString(cx->names().objectUndefined);
        return true;
    }

    /* Step 2. */
    if (args.thisv().isNull()) {
        args.rval().setString(cx->names().objectNull);
        return true;
    }

    /* Step 3. */
    RootedObject obj(cx, ToObject(cx, args.thisv()));
    if (!obj)
        return false;

    /* Steps 4-5. */
    JSString* str = JS_BasicObjectToString(cx, obj);
    if (!str)
        return false;
    args.rval().setString(str);
    return true;
}


bool
js::obj_valueOf(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    RootedObject obj(cx, ToObject(cx, args.thisv()));
    if (!obj)
        return false;
    args.rval().setObject(*obj);
    return true;
}

static bool
obj_setPrototypeOf(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    if (args.length() < 2) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
                             "Object.setPrototypeOf", "1", "");
        return false;
    }

    /* Step 1-2. */
    if (args[0].isNullOrUndefined()) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CANT_CONVERT_TO,
                             args[0].isNull() ? "null" : "undefined", "object");
        return false;
    }

    /* Step 3. */
    if (!args[1].isObjectOrNull()) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
                             "Object.setPrototypeOf", "an object or null", InformalValueTypeName(args[1]));
        return false;
    }

    /* Step 4. */
    if (!args[0].isObject()) {
        args.rval().set(args[0]);
        return true;
    }

    /* Step 5-7. */
    RootedObject obj(cx, &args[0].toObject());
    RootedObject newProto(cx, args[1].toObjectOrNull());
    if (!SetPrototype(cx, obj, newProto))
        return false;

    /* Step 8. */
    args.rval().set(args[0]);
    return true;
}

#if JS_HAS_OBJ_WATCHPOINT

bool
js::WatchHandler(JSContext* cx, JSObject* obj_, jsid id_, JS::Value old,
                 JS::Value* nvp, void* closure)
{
    RootedObject obj(cx, obj_);
    RootedId id(cx, id_);

    /* Avoid recursion on (obj, id) already being watched on cx. */
    AutoResolving resolving(cx, obj, id, AutoResolving::WATCH);
    if (resolving.alreadyStarted())
        return true;

    FixedInvokeArgs<3> args(cx);

    args[0].set(IdToValue(id));
    args[1].set(old);
    args[2].set(*nvp);

    RootedValue callable(cx, ObjectValue(*static_cast<JSObject*>(closure)));
    RootedValue thisv(cx, ObjectValue(*obj));
    RootedValue rv(cx);
    if (!Call(cx, callable, thisv, args, &rv))
        return false;

    *nvp = rv;
    return true;
}

static bool
obj_watch(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    RootedObject obj(cx, ToObject(cx, args.thisv()));
    if (!obj)
        return false;

    if (!GlobalObject::warnOnceAboutWatch(cx, obj))
        return false;

    if (args.length() <= 1) {
        ReportMissingArg(cx, args.calleev(), 1);
        return false;
    }

    RootedObject callable(cx, ValueToCallable(cx, args[1], args.length() - 2));
    if (!callable)
        return false;

    RootedId propid(cx);
    if (!ValueToId<CanGC>(cx, args[0], &propid))
        return false;

    if (!WatchProperty(cx, obj, propid, callable))
        return false;

    args.rval().setUndefined();
    return true;
}

static bool
obj_unwatch(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    RootedObject obj(cx, ToObject(cx, args.thisv()));
    if (!obj)
        return false;

    if (!GlobalObject::warnOnceAboutWatch(cx, obj))
        return false;

    RootedId id(cx);
    if (args.length() != 0) {
        if (!ValueToId<CanGC>(cx, args[0], &id))
            return false;
    } else {
        id = JSID_VOID;
    }

    if (!UnwatchProperty(cx, obj, id))
        return false;

    args.rval().setUndefined();
    return true;
}

#endif /* JS_HAS_OBJ_WATCHPOINT */

/* ECMA 15.2.4.5. */
bool
js::obj_hasOwnProperty(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    HandleValue idValue = args.get(0);

    // As an optimization, provide a fast path when rooting is not necessary and
    // we can safely retrieve the object's shape.

    /* Step 1, 2. */
    jsid id;
    if (args.thisv().isObject() && ValueToId<NoGC>(cx, idValue, &id)) {
        JSObject* obj = &args.thisv().toObject();
        Shape* prop;
        if (obj->isNative() &&
            NativeLookupOwnProperty<NoGC>(cx, &obj->as<NativeObject>(), id, &prop))
        {
            args.rval().setBoolean(!!prop);
            return true;
        }
    }

    /* Step 1. */
    RootedId idRoot(cx);
    if (!ToPropertyKey(cx, idValue, &idRoot))
        return false;

    /* Step 2. */
    RootedObject obj(cx, ToObject(cx, args.thisv()));
    if (!obj)
        return false;

    /* Step 3. */
    bool found;
    if (!HasOwnProperty(cx, obj, idRoot, &found))
        return false;

    /* Step 4,5. */
    args.rval().setBoolean(found);
    return true;
}

/* ES5 15.2.4.6. */
static bool
obj_isPrototypeOf(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    /* Step 1. */
    if (args.length() < 1 || !args[0].isObject()) {
        args.rval().setBoolean(false);
        return true;
    }

    /* Step 2. */
    RootedObject obj(cx, ToObject(cx, args.thisv()));
    if (!obj)
        return false;

    /* Step 3. */
    bool isDelegate;
    if (!IsDelegate(cx, obj, args[0], &isDelegate))
        return false;
    args.rval().setBoolean(isDelegate);
    return true;
}

PlainObject*
js::ObjectCreateImpl(JSContext* cx, HandleObject proto, NewObjectKind newKind,
                     HandleObjectGroup group)
{
    // Give the new object a small number of fixed slots, like we do for empty
    // object literals ({}).
    gc::AllocKind allocKind = GuessObjectGCKind(0);

    if (!proto) {
        // Object.create(null) is common, optimize it by using an allocation
        // site specific ObjectGroup. Because GetCallerInitGroup is pretty
        // slow, the caller can pass in the group if it's known and we use that
        // instead.
        RootedObjectGroup ngroup(cx, group);
        if (!ngroup) {
            ngroup = ObjectGroup::callingAllocationSiteGroup(cx, JSProto_Null);
            if (!ngroup)
                return nullptr;
        }

        MOZ_ASSERT(!ngroup->proto().toObjectOrNull());

        return NewObjectWithGroup<PlainObject>(cx, ngroup, allocKind, newKind);
    }

    return NewObjectWithGivenProto<PlainObject>(cx, proto, allocKind, newKind);
}

PlainObject*
js::ObjectCreateWithTemplate(JSContext* cx, HandlePlainObject templateObj)
{
    RootedObject proto(cx, templateObj->getProto());
    RootedObjectGroup group(cx, templateObj->group());
    return ObjectCreateImpl(cx, proto, GenericObject, group);
}

// ES6 draft rev34 (2015/02/20) 19.1.2.2 Object.create(O [, Properties])
bool
js::obj_create(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    // Step 1.
    if (args.length() == 0) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
                             "Object.create", "0", "s");
        return false;
    }

    if (!args[0].isObjectOrNull()) {
        RootedValue v(cx, args[0]);
        UniqueChars bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, nullptr);
        if (!bytes)
            return false;
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
                             bytes.get(), "not an object or null");
        return false;
    }

    // Step 2.
    RootedObject proto(cx, args[0].toObjectOrNull());
    RootedPlainObject obj(cx, ObjectCreateImpl(cx, proto));
    if (!obj)
        return false;

    // Step 3.
    if (args.hasDefined(1)) {
        RootedValue val(cx, args[1]);
        RootedObject props(cx, ToObject(cx, val));
        if (!props || !DefineProperties(cx, obj, props))
            return false;
    }

    // Step 4.
    args.rval().setObject(*obj);
    return true;
}

// ES6 draft rev27 (2014/08/24) 19.1.2.6 Object.getOwnPropertyDescriptor(O, P)
bool
js::obj_getOwnPropertyDescriptor(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    // Steps 1-2.
    RootedObject obj(cx, ToObject(cx, args.get(0)));
    if (!obj)
        return false;

    // Steps 3-4.
    RootedId id(cx);
    if (!ToPropertyKey(cx, args.get(1), &id))
        return false;

    // Steps 5-7.
    Rooted<PropertyDescriptor> desc(cx);
    return GetOwnPropertyDescriptor(cx, obj, id, &desc) &&
           JS::FromPropertyDescriptor(cx, desc, args.rval());
}

enum EnumerableOwnPropertiesKind {
    Keys,
    Values,
    KeysAndValues
};

// ES7 proposal 2015-12-14
// http://tc39.github.io/proposal-object-values-entries/#EnumerableOwnProperties
static bool
EnumerableOwnProperties(JSContext* cx, const JS::CallArgs& args, EnumerableOwnPropertiesKind kind)
{
    // Step 1. (Step 1 of Object.{keys,values,entries}, really.)
    RootedObject obj(cx, ToObject(cx, args.get(0)));
    if (!obj)
        return false;

    // Step 2.
    AutoIdVector ids(cx);
    if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY | JSITER_HIDDEN, &ids))
        return false;

    // Step 3.
    AutoValueVector properties(cx);
    size_t len = ids.length();
    if (!properties.resize(len))
        return false;

    RootedId id(cx);
    RootedValue key(cx);
    RootedValue value(cx);
    RootedNativeObject nobj(cx);
    if (obj->is<NativeObject>())
        nobj = &obj->as<NativeObject>();
    RootedShape shape(cx);
    Rooted<PropertyDescriptor> desc(cx);

    // Step 4.
    size_t out = 0;
    for (size_t i = 0; i < len; i++) {
        id = ids[i];

        // Step 4.a. (Symbols were filtered out in step 2.)
        MOZ_ASSERT(!JSID_IS_SYMBOL(id));

        if (kind != Values) {
            if (!IdToStringOrSymbol(cx, id, &key))
                return false;
        }

        // Step 4.a.i.
        if (nobj) {
            if (JSID_IS_INT(id) && nobj->containsDenseElement(JSID_TO_INT(id))) {
                value = nobj->getDenseOrTypedArrayElement(JSID_TO_INT(id));
            } else {
                shape = nobj->lookup(cx, id);
                if (!shape || !(GetShapeAttributes(nobj, shape) & JSPROP_ENUMERATE))
                    continue;
                if (!shape->isAccessorShape()) {
                    if (!NativeGetExistingProperty(cx, nobj, nobj, shape, &value))
                        return false;
                } else if (!GetProperty(cx, obj, obj, id, &value)) {
                    return false;
                }
            }
        } else {
            if (!GetOwnPropertyDescriptor(cx, obj, id, &desc))
                return false;

            // Step 4.a.ii. (inverted.)
            if (!desc.object() || !desc.enumerable())
                continue;

            // Step 4.a.ii.1.
            // (Omitted because Object.keys doesn't use this implementation.)

            // Step 4.a.ii.2.a.
            if (obj->isNative() && desc.hasValue())
                value = desc.value();
            else if (!GetProperty(cx, obj, obj, id, &value))
                return false;
        }

        // Steps 4.a.ii.2.b-c.
        if (kind == Values)
            properties[out++].set(value);
        else if (!NewValuePair(cx, key, value, properties[out++]))
            return false;
    }

    // Step 5.
    // (Implemented in step 2.)

    // Step 3 of Object.{keys,values,entries}
    JSObject* aobj = NewDenseCopiedArray(cx, out, properties.begin());
    if (!aobj)
        return false;

    args.rval().setObject(*aobj);
    return true;
}

// ES7 proposal 2015-12-14
// http://tc39.github.io/proposal-object-values-entries/#Object.keys
static bool
obj_keys(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return GetOwnPropertyKeys(cx, args, JSITER_OWNONLY);
}

// ES7 proposal 2015-12-14
// http://tc39.github.io/proposal-object-values-entries/#Object.values
static bool
obj_values(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return EnumerableOwnProperties(cx, args, Values);
}

// ES7 proposal 2015-12-14
// http://tc39.github.io/proposal-object-values-entries/#Object.entries
static bool
obj_entries(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return EnumerableOwnProperties(cx, args, KeysAndValues);
}

/* ES6 draft 15.2.3.16 */
static bool
obj_is(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    bool same;
    if (!SameValue(cx, args.get(0), args.get(1), &same))
        return false;

    args.rval().setBoolean(same);
    return true;
}

bool
js::IdToStringOrSymbol(JSContext* cx, HandleId id, MutableHandleValue result)
{
    if (JSID_IS_INT(id)) {
        JSString* str = Int32ToString<CanGC>(cx, JSID_TO_INT(id));
        if (!str)
            return false;
        result.setString(str);
    } else if (JSID_IS_ATOM(id)) {
        result.setString(JSID_TO_STRING(id));
    } else {
        result.setSymbol(JSID_TO_SYMBOL(id));
    }
    return true;
}

/* ES6 draft rev 25 (2014 May 22) 19.1.2.8.1 */
bool
js::GetOwnPropertyKeys(JSContext* cx, const JS::CallArgs& args, unsigned flags)
{
    // Steps 1-2.
    RootedObject obj(cx, ToObject(cx, args.get(0)));
    if (!obj)
        return false;

    // Steps 3-10.
    AutoIdVector keys(cx);
    if (!GetPropertyKeys(cx, obj, flags, &keys))
        return false;

    // Step 11.
    AutoValueVector vals(cx);
    if (!vals.resize(keys.length()))
        return false;

    for (size_t i = 0, len = keys.length(); i < len; i++) {
        MOZ_ASSERT_IF(JSID_IS_SYMBOL(keys[i]), flags & JSITER_SYMBOLS);
        MOZ_ASSERT_IF(!JSID_IS_SYMBOL(keys[i]), !(flags & JSITER_SYMBOLSONLY));
        if (!IdToStringOrSymbol(cx, keys[i], vals[i]))
            return false;
    }

    JSObject* aobj = NewDenseCopiedArray(cx, vals.length(), vals.begin());
    if (!aobj)
        return false;

    args.rval().setObject(*aobj);
    return true;
}

bool
js::obj_getOwnPropertyNames(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return GetOwnPropertyKeys(cx, args, JSITER_OWNONLY | JSITER_HIDDEN);
}

/* ES6 draft rev 25 (2014 May 22) 19.1.2.8 */
static bool
obj_getOwnPropertySymbols(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return GetOwnPropertyKeys(cx, args,
                              JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS | JSITER_SYMBOLSONLY);
}

/* ES6 draft rev 32 (2015 Feb 2) 19.1.2.4: Object.defineProperty(O, P, Attributes) */
bool
js::obj_defineProperty(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    // Steps 1-3.
    RootedObject obj(cx);
    if (!GetFirstArgumentAsObject(cx, args, "Object.defineProperty", &obj))
        return false;
    RootedId id(cx);
    if (!ToPropertyKey(cx, args.get(1), &id))
        return false;

    // Steps 4-5.
    Rooted<PropertyDescriptor> desc(cx);
    if (!ToPropertyDescriptor(cx, args.get(2), true, &desc))
        return false;

    // Steps 6-8.
    if (!DefineProperty(cx, obj, id, desc))
        return false;
    args.rval().setObject(*obj);
    return true;
}

/* ES5 15.2.3.7: Object.defineProperties(O, Properties) */
static bool
obj_defineProperties(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    /* Steps 1 and 7. */
    RootedObject obj(cx);
    if (!GetFirstArgumentAsObject(cx, args, "Object.defineProperties", &obj))
        return false;
    args.rval().setObject(*obj);

    /* Step 2. */
    if (args.length() < 2) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
                             "Object.defineProperties", "0", "s");
        return false;
    }
    RootedValue val(cx, args[1]);
    RootedObject props(cx, ToObject(cx, val));
    if (!props)
        return false;

    /* Steps 3-6. */
    return DefineProperties(cx, obj, props);
}

// ES6 20141014 draft 19.1.2.15 Object.preventExtensions(O)
static bool
obj_preventExtensions(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    args.rval().set(args.get(0));

    // Step 1.
    if (!args.get(0).isObject())
        return true;

    // Steps 2-5.
    RootedObject obj(cx, &args.get(0).toObject());
    return PreventExtensions(cx, obj);
}

// ES6 draft rev27 (2014/08/24) 19.1.2.5 Object.freeze(O)
static bool
obj_freeze(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    args.rval().set(args.get(0));

    // Step 1.
    if (!args.get(0).isObject())
        return true;

    // Steps 2-5.
    RootedObject obj(cx, &args.get(0).toObject());
    return SetIntegrityLevel(cx, obj, IntegrityLevel::Frozen);
}

// ES6 draft rev27 (2014/08/24) 19.1.2.12 Object.isFrozen(O)
static bool
obj_isFrozen(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    // Step 1.
    bool frozen = true;

    // Step 2.
    if (args.get(0).isObject()) {
        RootedObject obj(cx, &args.get(0).toObject());
        if (!TestIntegrityLevel(cx, obj, IntegrityLevel::Frozen, &frozen))
            return false;
    }
    args.rval().setBoolean(frozen);
    return true;
}

// ES6 draft rev27 (2014/08/24) 19.1.2.17 Object.seal(O)
static bool
obj_seal(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    args.rval().set(args.get(0));

    // Step 1.
    if (!args.get(0).isObject())
        return true;

    // Steps 2-5.
    RootedObject obj(cx, &args.get(0).toObject());
    return SetIntegrityLevel(cx, obj, IntegrityLevel::Sealed);
}

// ES6 draft rev27 (2014/08/24) 19.1.2.13 Object.isSealed(O)
static bool
obj_isSealed(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    // Step 1.
    bool sealed = true;

    // Step 2.
    if (args.get(0).isObject()) {
        RootedObject obj(cx, &args.get(0).toObject());
        if (!TestIntegrityLevel(cx, obj, IntegrityLevel::Sealed, &sealed))
            return false;
    }
    args.rval().setBoolean(sealed);
    return true;
}

static bool
ProtoGetter(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    HandleValue thisv = args.thisv();
    if (thisv.isNullOrUndefined()) {
        ReportIncompatible(cx, args);
        return false;
    }
    if (thisv.isPrimitive() && !BoxNonStrictThis(cx, args))
        return false;

    RootedObject obj(cx, &args.thisv().toObject());
    RootedObject proto(cx);
    if (!GetPrototype(cx, obj, &proto))
        return false;
    args.rval().setObjectOrNull(proto);
    return true;
}

namespace js {
size_t sSetProtoCalled = 0;
} // namespace js

static bool
ProtoSetter(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    HandleValue thisv = args.thisv();
    if (thisv.isNullOrUndefined()) {
        ReportIncompatible(cx, args);
        return false;
    }
    if (thisv.isPrimitive()) {
        // Mutating a boxed primitive's [[Prototype]] has no side effects.
        args.rval().setUndefined();
        return true;
    }

    if (!cx->runningWithTrustedPrincipals())
        ++sSetProtoCalled;

    Rooted<JSObject*> obj(cx, &args.thisv().toObject());

    /* Do nothing if __proto__ isn't being set to an object or null. */
    if (args.length() == 0 || !args[0].isObjectOrNull()) {
        args.rval().setUndefined();
        return true;
    }

    Rooted<JSObject*> newProto(cx, args[0].toObjectOrNull());
    if (!SetPrototype(cx, obj, newProto))
        return false;

    args.rval().setUndefined();
    return true;
}

static const JSFunctionSpec object_methods[] = {
#if JS_HAS_TOSOURCE
    JS_FN(js_toSource_str,             obj_toSource,                0,0),
#endif
    JS_FN(js_toString_str,             obj_toString,                0,0),
    JS_SELF_HOSTED_FN(js_toLocaleString_str, "Object_toLocaleString", 0, 0),
    JS_FN(js_valueOf_str,              obj_valueOf,                 0,0),
#if JS_HAS_OBJ_WATCHPOINT
    JS_FN(js_watch_str,                obj_watch,                   2,0),
    JS_FN(js_unwatch_str,              obj_unwatch,                 1,0),
#endif
    JS_FN(js_hasOwnProperty_str,       obj_hasOwnProperty,          1,0),
    JS_FN(js_isPrototypeOf_str,        obj_isPrototypeOf,           1,0),
    JS_FN(js_propertyIsEnumerable_str, obj_propertyIsEnumerable,    1,0),
#if JS_OLD_GETTER_SETTER_METHODS
    JS_SELF_HOSTED_FN(js_defineGetter_str, "ObjectDefineGetter",    2,0),
    JS_SELF_HOSTED_FN(js_defineSetter_str, "ObjectDefineSetter",    2,0),
    JS_SELF_HOSTED_FN(js_lookupGetter_str, "ObjectLookupGetter",    1,0),
    JS_SELF_HOSTED_FN(js_lookupSetter_str, "ObjectLookupSetter",    1,0),
#endif
    JS_FS_END
};

static const JSPropertySpec object_properties[] = {
#if JS_HAS_OBJ_PROTO_PROP
    JS_PSGS("__proto__", ProtoGetter, ProtoSetter, 0),
#endif
    JS_PS_END
};

static const JSFunctionSpec object_static_methods[] = {
    JS_SELF_HOSTED_FN("assign",        "ObjectStaticAssign",        2, 0),
    JS_SELF_HOSTED_FN("getPrototypeOf", "ObjectGetPrototypeOf",     1, 0),
    JS_FN("setPrototypeOf",            obj_setPrototypeOf,          2, 0),
    JS_FN("getOwnPropertyDescriptor",  obj_getOwnPropertyDescriptor,2, 0),
    JS_FN("keys",                      obj_keys,                    1, 0),
    JS_FN("values",                    obj_values,                  1, 0),
    JS_FN("entries",                   obj_entries,                 1, 0),
    JS_FN("is",                        obj_is,                      2, 0),
    JS_FN("defineProperty",            obj_defineProperty,          3, 0),
    JS_FN("defineProperties",          obj_defineProperties,        2, 0),
    JS_INLINABLE_FN("create",          obj_create,                  2, 0, ObjectCreate),
    JS_FN("getOwnPropertyNames",       obj_getOwnPropertyNames,     1, 0),
    JS_FN("getOwnPropertySymbols",     obj_getOwnPropertySymbols,   1, 0),
    JS_SELF_HOSTED_FN("isExtensible",  "ObjectIsExtensible",        1, 0),
    JS_FN("preventExtensions",         obj_preventExtensions,       1, 0),
    JS_FN("freeze",                    obj_freeze,                  1, 0),
    JS_FN("isFrozen",                  obj_isFrozen,                1, 0),
    JS_FN("seal",                      obj_seal,                    1, 0),
    JS_FN("isSealed",                  obj_isSealed,                1, 0),
    JS_FS_END
};

static JSObject*
CreateObjectConstructor(JSContext* cx, JSProtoKey key)
{
    Rooted<GlobalObject*> self(cx, cx->global());
    if (!GlobalObject::ensureConstructor(cx, self, JSProto_Function))
        return nullptr;

    /* Create the Object function now that we have a [[Prototype]] for it. */
    return NewNativeConstructor(cx, obj_construct, 1, HandlePropertyName(cx->names().Object),
                                gc::AllocKind::FUNCTION, SingletonObject);
}

static JSObject*
CreateObjectPrototype(JSContext* cx, JSProtoKey key)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    MOZ_ASSERT(cx->global()->isNative());

    /*
     * Create |Object.prototype| first, mirroring CreateBlankProto but for the
     * prototype of the created object.
     */
    RootedPlainObject objectProto(cx, NewObjectWithGivenProto<PlainObject>(cx, nullptr,
                                                                           SingletonObject));
    if (!objectProto)
        return nullptr;

    bool succeeded;
    if (!SetImmutablePrototype(cx, objectProto, &succeeded))
        return nullptr;
    MOZ_ASSERT(succeeded,
               "should have been able to make a fresh Object.prototype's "
               "[[Prototype]] immutable");

    /*
     * The default 'new' type of Object.prototype is required by type inference
     * to have unknown properties, to simplify handling of e.g. heterogenous
     * objects in JSON and script literals.
     */
    if (!JSObject::setNewGroupUnknown(cx, &PlainObject::class_, objectProto))
        return nullptr;

    return objectProto;
}

static bool
FinishObjectClassInit(JSContext* cx, JS::HandleObject ctor, JS::HandleObject proto)
{
    Rooted<GlobalObject*> global(cx, cx->global());

    /* ES5 15.1.2.1. */
    RootedId evalId(cx, NameToId(cx->names().eval));
    JSObject* evalobj = DefineFunction(cx, global, evalId, IndirectEval, 1,
                                       JSFUN_STUB_GSOPS | JSPROP_RESOLVING);
    if (!evalobj)
        return false;
    global->setOriginalEval(evalobj);

    Rooted<NativeObject*> holder(cx, GlobalObject::getIntrinsicsHolder(cx, global));
    if (!holder)
        return false;

    /*
     * The global object should have |Object.prototype| as its [[Prototype]].
     * Eventually we'd like to have standard classes be there from the start,
     * and thus we would know we were always setting what had previously been a
     * null [[Prototype]], but right now some code assumes it can set the
     * [[Prototype]] before standard classes have been initialized.  For now,
     * only set the [[Prototype]] if it hasn't already been set.
     */
    Rooted<TaggedProto> tagged(cx, TaggedProto(proto));
    if (global->shouldSplicePrototype(cx)) {
        if (!global->splicePrototype(cx, global->getClass(), tagged))
            return false;
    }
    return true;
}

static const ClassSpec PlainObjectClassSpec = {
    CreateObjectConstructor,
    CreateObjectPrototype,
    object_static_methods,
    nullptr,
    object_methods,
    object_properties,
    FinishObjectClassInit
};

const Class PlainObject::class_ = {
    js_Object_str,
    JSCLASS_HAS_CACHED_PROTO(JSProto_Object),
    JS_NULL_CLASS_OPS,
    &PlainObjectClassSpec
};

const Class* const js::ObjectClassPtr = &PlainObject::class_;