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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 *
 * The Original Code is SpiderMonkey code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef jsfriendapi_h___
#define jsfriendapi_h___

#include "jsclass.h"
#include "jspubtd.h"
#include "jsprvtd.h"

#include "mozilla/GuardObjects.h"

JS_BEGIN_EXTERN_C

extern JS_FRIEND_API(void)
JS_SetGrayGCRootsTracer(JSRuntime *rt, JSTraceDataOp traceOp, void *data);

extern JS_FRIEND_API(JSString *)
JS_GetAnonymousString(JSRuntime *rt);

extern JS_FRIEND_API(JSObject *)
JS_FindCompilationScope(JSContext *cx, JSObject *obj);

extern JS_FRIEND_API(JSFunction *)
JS_GetObjectFunction(JSObject *obj);

extern JS_FRIEND_API(JSObject *)
JS_GetGlobalForFrame(JSStackFrame *fp);

extern JS_FRIEND_API(JSBool)
JS_SplicePrototype(JSContext *cx, JSObject *obj, JSObject *proto);

extern JS_FRIEND_API(JSObject *)
JS_NewObjectWithUniqueType(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent);

extern JS_FRIEND_API(uint32_t)
JS_ObjectCountDynamicSlots(JSObject *obj);

extern JS_FRIEND_API(void)
JS_ShrinkGCBuffers(JSRuntime *rt);

extern JS_FRIEND_API(size_t)
JS_GetE4XObjectsCreated(JSContext *cx);

extern JS_FRIEND_API(size_t)
JS_SetProtoCalled(JSContext *cx);

extern JS_FRIEND_API(size_t)
JS_GetCustomIteratorCount(JSContext *cx);

extern JS_FRIEND_API(JSBool)
JS_NondeterministicGetWeakMapKeys(JSContext *cx, JSObject *obj, JSObject **ret);

/*
 * Used by the cycle collector to trace through the shape and all
 * shapes it reaches, marking all non-shape children found in the
 * process. Uses bounded stack space.
 */
extern JS_FRIEND_API(void)
JS_TraceShapeCycleCollectorChildren(JSTracer *trc, void *shape);

enum {
    JS_TELEMETRY_GC_REASON,
    JS_TELEMETRY_GC_IS_COMPARTMENTAL,
    JS_TELEMETRY_GC_MS,
    JS_TELEMETRY_GC_MARK_MS,
    JS_TELEMETRY_GC_SWEEP_MS,
    JS_TELEMETRY_GC_SLICE_MS,
    JS_TELEMETRY_GC_MMU_50,
    JS_TELEMETRY_GC_RESET,
    JS_TELEMETRY_GC_INCREMENTAL_DISABLED,
    JS_TELEMETRY_GC_NON_INCREMENTAL
};

typedef void
(* JSAccumulateTelemetryDataCallback)(int id, uint32_t sample);

extern JS_FRIEND_API(void)
JS_SetAccumulateTelemetryCallback(JSRuntime *rt, JSAccumulateTelemetryDataCallback callback);

extern JS_FRIEND_API(JSPrincipals *)
JS_GetCompartmentPrincipals(JSCompartment *compartment);

/* Safe to call with input obj == NULL. Returns non-NULL iff obj != NULL. */
extern JS_FRIEND_API(JSObject *)
JS_ObjectToInnerObject(JSContext *cx, JSObject *obj);

/* Requires obj != NULL. */
extern JS_FRIEND_API(JSObject *)
JS_ObjectToOuterObject(JSContext *cx, JSObject *obj);

extern JS_FRIEND_API(JSObject *)
JS_CloneObject(JSContext *cx, JSObject *obj, JSObject *proto, JSObject *parent);

extern JS_FRIEND_API(JSBool)
js_GetterOnlyPropertyStub(JSContext *cx, JSObject *obj, jsid id, JSBool strict, jsval *vp);

JS_FRIEND_API(void)
js_ReportOverRecursed(JSContext *maybecx);

#ifdef DEBUG

/*
 * Routines to print out values during debugging.  These are FRIEND_API to help
 * the debugger find them and to support temporarily hacking js_Dump* calls
 * into other code.
 */

extern JS_FRIEND_API(void)
js_DumpString(JSString *str);

extern JS_FRIEND_API(void)
js_DumpAtom(JSAtom *atom);

extern JS_FRIEND_API(void)
js_DumpObject(JSObject *obj);

extern JS_FRIEND_API(void)
js_DumpChars(const jschar *s, size_t n);
#endif

#ifdef __cplusplus

extern JS_FRIEND_API(bool)
JS_CopyPropertiesFrom(JSContext *cx, JSObject *target, JSObject *obj);

extern JS_FRIEND_API(JSBool)
JS_WrapPropertyDescriptor(JSContext *cx, js::PropertyDescriptor *desc);

extern JS_FRIEND_API(JSBool)
JS_EnumerateState(JSContext *cx, JSObject *obj, JSIterateOp enum_op, js::Value *statep, jsid *idp);

struct JSFunctionSpecWithHelp {
    const char      *name;
    JSNative        call;
    uint16_t        nargs;
    uint16_t        flags;
    const char      *usage;
    const char      *help;
};

#define JS_FN_HELP(name,call,nargs,flags,usage,help)                          \
    {name, call, nargs, (flags) | JSPROP_ENUMERATE | JSFUN_STUB_GSOPS, usage, help}

extern JS_FRIEND_API(bool)
JS_DefineFunctionsWithHelp(JSContext *cx, JSObject *obj, const JSFunctionSpecWithHelp *fs);

#endif

JS_END_EXTERN_C

#ifdef __cplusplus

namespace js {

struct RuntimeFriendFields {
    /*
     * If non-zero, we were been asked to call the operation callback as soon
     * as possible.
     */
    volatile int32_t    interrupt;

    /* Limit pointer for checking native stack consumption. */
    uintptr_t           nativeStackLimit;

    RuntimeFriendFields()
      : interrupt(0),
        nativeStackLimit(0) { }

    static const RuntimeFriendFields *get(const JSRuntime *rt) {
        return reinterpret_cast<const RuntimeFriendFields *>(rt);
    }
};

inline JSRuntime *
GetRuntime(const JSContext *cx)
{
    return ContextFriendFields::get(cx)->runtime;
}

typedef bool
(* PreserveWrapperCallback)(JSContext *cx, JSObject *obj);

#ifdef DEBUG
 /*
  * DEBUG-only method to dump the complete object graph of heap-allocated things.
  * fp is the file for the dump output.
  */
extern JS_FRIEND_API(void)
DumpHeapComplete(JSRuntime *rt, FILE *fp);

#endif

class JS_FRIEND_API(AutoPreserveCompartment) {
  private:
    JSContext *cx;
    JSCompartment *oldCompartment;
  public:
    AutoPreserveCompartment(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM);
    ~AutoPreserveCompartment();
    JS_DECL_USE_GUARD_OBJECT_NOTIFIER
};

class JS_FRIEND_API(AutoSwitchCompartment) {
  private:
    JSContext *cx;
    JSCompartment *oldCompartment;
  public:
    AutoSwitchCompartment(JSContext *cx, JSCompartment *newCompartment
                          JS_GUARD_OBJECT_NOTIFIER_PARAM);
    AutoSwitchCompartment(JSContext *cx, JSObject *target JS_GUARD_OBJECT_NOTIFIER_PARAM);
    ~AutoSwitchCompartment();
    JS_DECL_USE_GUARD_OBJECT_NOTIFIER
};

#ifdef OLD_GETTER_SETTER_METHODS
JS_FRIEND_API(JSBool) obj_defineGetter(JSContext *cx, unsigned argc, js::Value *vp);
JS_FRIEND_API(JSBool) obj_defineSetter(JSContext *cx, unsigned argc, js::Value *vp);
#endif

extern JS_FRIEND_API(bool)
IsSystemCompartment(const JSCompartment *compartment);

extern JS_FRIEND_API(bool)
IsAtomsCompartment(const JSCompartment *c);

/*
 * Check whether it is OK to assign an undeclared property with name
 * propname of the global object in the current script on cx.  Reports
 * an error if one needs to be reported (in particular in all cases
 * when it returns false).
 */
extern JS_FRIEND_API(bool)
CheckUndeclaredVarAssignment(JSContext *cx, JSString *propname);

struct WeakMapTracer;

/*
 * Weak map tracer callback, called once for every binding of every
 * weak map that was live at the time of the last garbage collection.
 *
 * m will be NULL if the weak map is not contained in a JS Object.
 */
typedef void
(* WeakMapTraceCallback)(WeakMapTracer *trc, JSObject *m,
                         void *k, JSGCTraceKind kkind,
                         void *v, JSGCTraceKind vkind);

struct WeakMapTracer {
    JSRuntime            *runtime;
    WeakMapTraceCallback callback;

    WeakMapTracer(JSRuntime *rt, WeakMapTraceCallback cb)
        : runtime(rt), callback(cb) {}
};

extern JS_FRIEND_API(void)
TraceWeakMaps(WeakMapTracer *trc);

extern JS_FRIEND_API(bool)
GCThingIsMarkedGray(void *thing);

/*
 * Shadow declarations of JS internal structures, for access by inline access
 * functions below. Do not use these structures in any other way. When adding
 * new fields for access by inline methods, make sure to add static asserts to
 * the original header file to ensure that offsets are consistent.
 */
namespace shadow {

struct TypeObject {
    JSObject    *proto;
};

struct BaseShape {
    js::Class   *clasp;
    JSObject    *parent;
};

struct Shape {
    BaseShape   *base;
    jsid        _1;
    uint32_t    slotInfo;

    static const uint32_t FIXED_SLOTS_SHIFT = 27;
};

struct Object {
    Shape       *shape;
    TypeObject  *type;
    js::Value   *slots;
    js::Value   *_1;

    size_t numFixedSlots() const { return shape->slotInfo >> Shape::FIXED_SLOTS_SHIFT; }
    Value *fixedSlots() const {
        return (Value *)(uintptr_t(this) + sizeof(shadow::Object));
    }

    js::Value &slotRef(size_t slot) const {
        size_t nfixed = numFixedSlots();
        if (slot < nfixed)
            return fixedSlots()[slot];
        return slots[slot - nfixed];
    }
};

struct Atom {
    size_t _;
    const jschar *chars;
};

} /* namespace shadow */

extern JS_FRIEND_DATA(js::Class) AnyNameClass;
extern JS_FRIEND_DATA(js::Class) AttributeNameClass;
extern JS_FRIEND_DATA(js::Class) CallClass;
extern JS_FRIEND_DATA(js::Class) DeclEnvClass;
extern JS_FRIEND_DATA(js::Class) FunctionClass;
extern JS_FRIEND_DATA(js::Class) FunctionProxyClass;
extern JS_FRIEND_DATA(js::Class) NamespaceClass;
extern JS_FRIEND_DATA(js::Class) OuterWindowProxyClass;
extern JS_FRIEND_DATA(js::Class) ObjectProxyClass;
extern JS_FRIEND_DATA(js::Class) QNameClass;
extern JS_FRIEND_DATA(js::Class) XMLClass;
extern JS_FRIEND_DATA(js::Class) ObjectClass;

inline js::Class *
GetObjectClass(const JSObject *obj)
{
    return reinterpret_cast<const shadow::Object*>(obj)->shape->base->clasp;
}

inline JSClass *
GetObjectJSClass(const JSObject *obj)
{
    return js::Jsvalify(GetObjectClass(obj));
}

JS_FRIEND_API(bool)
IsScopeObject(JSObject *obj);

inline JSObject *
GetObjectParent(JSObject *obj)
{
    JS_ASSERT(!IsScopeObject(obj));
    return reinterpret_cast<shadow::Object*>(obj)->shape->base->parent;
}

JS_FRIEND_API(JSObject *)
GetObjectParentMaybeScope(JSObject *obj);

JS_FRIEND_API(JSObject *)
GetGlobalForObjectCrossCompartment(JSObject *obj);

JS_FRIEND_API(bool)
IsOriginalScriptFunction(JSFunction *fun);

JS_FRIEND_API(JSFunction *)
DefineFunctionWithReserved(JSContext *cx, JSObject *obj, const char *name, JSNative call,
                           unsigned nargs, unsigned attrs);

JS_FRIEND_API(JSFunction *)
NewFunctionWithReserved(JSContext *cx, JSNative call, unsigned nargs, unsigned flags,
                        JSObject *parent, const char *name);

JS_FRIEND_API(JSFunction *)
NewFunctionByIdWithReserved(JSContext *cx, JSNative native, unsigned nargs, unsigned flags,
                            JSObject *parent, jsid id);

JS_FRIEND_API(JSObject *)
InitClassWithReserved(JSContext *cx, JSObject *obj, JSObject *parent_proto,
                      JSClass *clasp, JSNative constructor, unsigned nargs,
                      JSPropertySpec *ps, JSFunctionSpec *fs,
                      JSPropertySpec *static_ps, JSFunctionSpec *static_fs);

JS_FRIEND_API(const Value &)
GetFunctionNativeReserved(JSObject *fun, size_t which);

JS_FRIEND_API(void)
SetFunctionNativeReserved(JSObject *fun, size_t which, const Value &val);

inline JSObject *
GetObjectProto(JSObject *obj)
{
    return reinterpret_cast<const shadow::Object*>(obj)->type->proto;
}

inline void *
GetObjectPrivate(JSObject *obj)
{
    const shadow::Object *nobj = reinterpret_cast<const shadow::Object*>(obj);
    void **addr = reinterpret_cast<void**>(&nobj->fixedSlots()[nobj->numFixedSlots()]);
    return *addr;
}

/*
 * Get a slot that is both reserved for object's clasp *and* is fixed (fits
 * within the maximum capacity for the object's fixed slots).
 */
inline const Value &
GetReservedSlot(const JSObject *obj, size_t slot)
{
    JS_ASSERT(slot < JSCLASS_RESERVED_SLOTS(GetObjectClass(obj)));
    return reinterpret_cast<const shadow::Object *>(obj)->slotRef(slot);
}

JS_FRIEND_API(void)
SetReservedSlotWithBarrier(JSObject *obj, size_t slot, const Value &value);

inline void
SetReservedSlot(JSObject *obj, size_t slot, const Value &value)
{
    JS_ASSERT(slot < JSCLASS_RESERVED_SLOTS(GetObjectClass(obj)));
    shadow::Object *sobj = reinterpret_cast<shadow::Object *>(obj);
    if (sobj->slotRef(slot).isMarkable())
        SetReservedSlotWithBarrier(obj, slot, value);
    else
        sobj->slotRef(slot) = value;
}

JS_FRIEND_API(uint32_t)
GetObjectSlotSpan(JSObject *obj);

inline const Value &
GetObjectSlot(JSObject *obj, size_t slot)
{
    JS_ASSERT(slot < GetObjectSlotSpan(obj));
    return reinterpret_cast<const shadow::Object *>(obj)->slotRef(slot);
}

inline Shape *
GetObjectShape(JSObject *obj)
{
    shadow::Shape *shape = reinterpret_cast<const shadow::Object*>(obj)->shape;
    return reinterpret_cast<Shape *>(shape);
}

inline const jschar *
GetAtomChars(JSAtom *atom)
{
    return reinterpret_cast<shadow::Atom *>(atom)->chars;
}

inline JSLinearString *
AtomToLinearString(JSAtom *atom)
{
    return reinterpret_cast<JSLinearString *>(atom);
}

static inline js::PropertyOp
CastAsJSPropertyOp(JSObject *object)
{
    return JS_DATA_TO_FUNC_PTR(js::PropertyOp, object);
}

static inline js::StrictPropertyOp
CastAsJSStrictPropertyOp(JSObject *object)
{
    return JS_DATA_TO_FUNC_PTR(js::StrictPropertyOp, object);
}

JS_FRIEND_API(bool)
GetPropertyNames(JSContext *cx, JSObject *obj, unsigned flags, js::AutoIdVector *props);

JS_FRIEND_API(bool)
StringIsArrayIndex(JSLinearString *str, uint32_t *indexp);

JS_FRIEND_API(void)
SetPreserveWrapperCallback(JSRuntime *rt, PreserveWrapperCallback callback);

JS_FRIEND_API(bool)
IsObjectInContextCompartment(const JSObject *obj, const JSContext *cx);

/*
 * NB: these flag bits are encoded into the bytecode stream in the immediate
 * operand of JSOP_ITER, so don't change them without advancing vm/Xdr.h's
 * XDR_BYTECODE_VERSION.
 */
#define JSITER_ENUMERATE  0x1   /* for-in compatible hidden default iterator */
#define JSITER_FOREACH    0x2   /* return [key, value] pair rather than key */
#define JSITER_KEYVALUE   0x4   /* destructuring for-in wants [key, value] */
#define JSITER_OWNONLY    0x8   /* iterate over obj's own properties only */
#define JSITER_HIDDEN     0x10  /* also enumerate non-enumerable properties */
#define JSITER_FOR_OF     0x20  /* harmony for-of loop */

inline uintptr_t
GetNativeStackLimit(const JSRuntime *rt)
{
    return RuntimeFriendFields::get(rt)->nativeStackLimit;
}

#define JS_CHECK_RECURSION(cx, onerror)                                         \
    JS_BEGIN_MACRO                                                              \
        int stackDummy_;                                                        \
        if (!JS_CHECK_STACK_SIZE(js::GetNativeStackLimit(js::GetRuntime(cx)), &stackDummy_)) { \
            js_ReportOverRecursed(cx);                                          \
            onerror;                                                            \
        }                                                                       \
    JS_END_MACRO

JS_FRIEND_API(void)
StartPCCountProfiling(JSContext *cx);

JS_FRIEND_API(void)
StopPCCountProfiling(JSContext *cx);

JS_FRIEND_API(void)
PurgePCCounts(JSContext *cx);

JS_FRIEND_API(size_t)
GetPCCountScriptCount(JSContext *cx);

JS_FRIEND_API(JSString *)
GetPCCountScriptSummary(JSContext *cx, size_t script);

JS_FRIEND_API(JSString *)
GetPCCountScriptContents(JSContext *cx, size_t script);

#ifdef JS_THREADSAFE
JS_FRIEND_API(void *)
GetOwnerThread(const JSContext *cx);

JS_FRIEND_API(unsigned)
GetContextOutstandingRequests(const JSContext *cx);
#endif

JS_FRIEND_API(JSCompartment *)
GetContextCompartment(const JSContext *cx);

JS_FRIEND_API(bool)
HasUnrootedGlobal(const JSContext *cx);

typedef void
(* ActivityCallback)(void *arg, JSBool active);

/*
 * Sets a callback that is run whenever the runtime goes idle - the
 * last active request ceases - and begins activity - when it was
 * idle and a request begins.
 */
JS_FRIEND_API(void)
SetActivityCallback(JSRuntime *rt, ActivityCallback cb, void *arg);

extern JS_FRIEND_API(const JSStructuredCloneCallbacks *)
GetContextStructuredCloneCallbacks(JSContext *cx);

extern JS_FRIEND_API(JSVersion)
VersionSetXML(JSVersion version, bool enable);

extern JS_FRIEND_API(bool)
CanCallContextDebugHandler(JSContext *cx);

extern JS_FRIEND_API(JSTrapStatus)
CallContextDebugHandler(JSContext *cx, JSScript *script, jsbytecode *bc, Value *rval);

extern JS_FRIEND_API(bool)
IsContextRunningJS(JSContext *cx);

class SystemAllocPolicy;
typedef Vector<JSCompartment*, 0, SystemAllocPolicy> CompartmentVector;
extern JS_FRIEND_API(const CompartmentVector&)
GetRuntimeCompartments(JSRuntime *rt);

extern JS_FRIEND_API(size_t)
SizeOfJSContext();

#define GCREASONS(D)                            \
    /* Reasons internal to the JS engine */     \
    D(API)                                      \
    D(MAYBEGC)                                  \
    D(LAST_CONTEXT)                             \
    D(DESTROY_CONTEXT)                          \
    D(LAST_DITCH)                               \
    D(TOO_MUCH_MALLOC)                          \
    D(ALLOC_TRIGGER)                            \
    D(DEBUG_GC)                                 \
    D(UNUSED2) /* was SHAPE */                  \
    D(UNUSED3) /* was REFILL */                 \
                                                \
    /* Reasons from Firefox */                  \
    D(DOM_WINDOW_UTILS)                         \
    D(COMPONENT_UTILS)                          \
    D(MEM_PRESSURE)                             \
    D(CC_WAITING)                               \
    D(CC_FORCED)                                \
    D(LOAD_END)                                 \
    D(POST_COMPARTMENT)                         \
    D(PAGE_HIDE)                                \
    D(NSJSCONTEXT_DESTROY)                      \
    D(SET_NEW_DOCUMENT)                         \
    D(SET_DOC_SHELL)                            \
    D(DOM_UTILS)                                \
    D(DOM_IPC)                                  \
    D(DOM_WORKER)                               \
    D(INTER_SLICE_GC)                           \
    D(REFRESH_FRAME)

namespace gcreason {

/* GCReasons will end up looking like JSGC_MAYBEGC */
enum Reason {
#define MAKE_REASON(name) name,
    GCREASONS(MAKE_REASON)
#undef MAKE_REASON
    NO_REASON,
    NUM_REASONS
};

} /* namespace gcreason */

extern JS_FRIEND_API(void)
PrepareCompartmentForGC(JSCompartment *comp);

extern JS_FRIEND_API(void)
PrepareForFullGC(JSRuntime *rt);

/*
 * When triggering a GC using one of the functions below, it is first necessary
 * to select the compartments to be collected. To do this, you can call
 * PrepareCompartmentForGC on each compartment, or you can call PrepareForFullGC
 * to select all compartments. Failing to select any compartment is an error.
 */

extern JS_FRIEND_API(void)
GCForReason(JSRuntime *rt, gcreason::Reason reason);

extern JS_FRIEND_API(void)
ShrinkingGC(JSRuntime *rt, gcreason::Reason reason);

extern JS_FRIEND_API(void)
IncrementalGC(JSRuntime *rt, gcreason::Reason reason);

extern JS_FRIEND_API(void)
SetGCSliceTimeBudget(JSContext *cx, int64_t millis);

enum GCProgress {
    /*
     * During non-incremental GC, the GC is bracketed by JSGC_CYCLE_BEGIN/END
     * callbacks. During an incremental GC, the sequence of callbacks is as
     * follows:
     *   JSGC_CYCLE_BEGIN, JSGC_SLICE_END  (first slice)
     *   JSGC_SLICE_BEGIN, JSGC_SLICE_END  (second slice)
     *   ...
     *   JSGC_SLICE_BEGIN, JSGC_CYCLE_END  (last slice)
     */

    GC_CYCLE_BEGIN,
    GC_SLICE_BEGIN,
    GC_SLICE_END,
    GC_CYCLE_END
};

struct JS_FRIEND_API(GCDescription) {
    bool isCompartment;

    GCDescription(bool isCompartment)
      : isCompartment(isCompartment) {}

    jschar *formatMessage(JSRuntime *rt) const;
    jschar *formatJSON(JSRuntime *rt, uint64_t timestamp) const;
};

typedef void
(* GCSliceCallback)(JSRuntime *rt, GCProgress progress, const GCDescription &desc);

extern JS_FRIEND_API(GCSliceCallback)
SetGCSliceCallback(JSRuntime *rt, GCSliceCallback callback);

/*
 * Signals a good place to do an incremental slice, because the browser is
 * drawing a frame.
 */
extern JS_FRIEND_API(void)
NotifyDidPaint(JSRuntime *rt);

extern JS_FRIEND_API(bool)
IsIncrementalGCEnabled(JSRuntime *rt);

extern JS_FRIEND_API(void)
DisableIncrementalGC(JSRuntime *rt);

extern JS_FRIEND_API(bool)
IsIncrementalBarrierNeeded(JSRuntime *rt);

extern JS_FRIEND_API(bool)
IsIncrementalBarrierNeeded(JSContext *cx);

extern JS_FRIEND_API(bool)
IsIncrementalBarrierNeededOnObject(JSObject *obj);

extern JS_FRIEND_API(void)
IncrementalReferenceBarrier(void *ptr);

extern JS_FRIEND_API(void)
IncrementalValueBarrier(const Value &v);

class ObjectPtr
{
    JSObject *value;

  public:
    ObjectPtr() : value(NULL) {}

    ObjectPtr(JSObject *obj) : value(obj) {}

    /* Always call finalize before the destructor. */
    ~ObjectPtr() { JS_ASSERT(!value); }

    void finalize(JSRuntime *rt) {
        if (IsIncrementalBarrierNeeded(rt))
            IncrementalReferenceBarrier(value);
        value = NULL;
    }

    void init(JSObject *obj) { value = obj; }

    JSObject *get() const { return value; }

    void writeBarrierPre(JSRuntime *rt) {
        IncrementalReferenceBarrier(value);
    }

    ObjectPtr &operator=(JSObject *obj) {
        IncrementalReferenceBarrier(value);
        value = obj;
        return *this;
    }

    JSObject &operator*() const { return *value; }
    JSObject *operator->() const { return value; }
    operator JSObject *() const { return value; }
};

extern JS_FRIEND_API(JSObject *)
GetTestingFunctions(JSContext *cx);

/*
 * Helper to convert FreeOp to JSFreeOp when the definition of FreeOp is not
 * available and the compiler does not know that FreeOp inherits from
 * JSFreeOp.
 */
inline JSFreeOp *
CastToJSFreeOp(FreeOp *fop)
{
    return reinterpret_cast<JSFreeOp *>(fop);
}

/* Implemented in jsexn.cpp. */

/*
 * Get an error type name from a number.
 * If no exception is associated, return NULL.
 */
extern JS_FRIEND_API(const jschar*)
GetErrorTypeNameFromNumber(JSContext* cx, const unsigned errorNumber);

} /* namespace js */

#endif

/* Implemented in jsdate.cpp. */

/*
 * Detect whether the internal date value is NaN.  (Because failure is
 * out-of-band for js_DateGet*)
 */
extern JS_FRIEND_API(JSBool)
js_DateIsValid(JSContext *cx, JSObject* obj);

extern JS_FRIEND_API(double)
js_DateGetMsecSinceEpoch(JSContext *cx, JSObject *obj);

/* Implemented in jscntxt.cpp. */

/*
 * Report an exception, which is currently realized as a printf-style format
 * string and its arguments.
 */
typedef enum JSErrNum {
#define MSG_DEF(name, number, count, exception, format) \
    name = number,
#include "js.msg"
#undef MSG_DEF
    JSErr_Limit
} JSErrNum;

extern JS_FRIEND_API(const JSErrorFormatString *)
js_GetErrorMessage(void *userRef, const char *locale, const unsigned errorNumber);

/* Implemented in jsclone.cpp. */

extern JS_FRIEND_API(uint64_t)
js_GetSCOffset(JSStructuredCloneWriter* writer);

/* Typed Array functions, implemented in jstypedarray.cpp */

#ifdef __cplusplus

namespace js {
namespace ArrayBufferView {

enum ViewType {
    TYPE_INT8 = 0,
    TYPE_UINT8,
    TYPE_INT16,
    TYPE_UINT16,
    TYPE_INT32,
    TYPE_UINT32,
    TYPE_FLOAT32,
    TYPE_FLOAT64,

    /*
     * Special type that is a uint8_t, but assignments are clamped to [0, 256).
     * Treat the raw data type as a uint8_t.
     */
    TYPE_UINT8_CLAMPED,

    TYPE_MAX
};

} /* namespace ArrayBufferView */
} /* namespace js */

typedef js::ArrayBufferView::ViewType JSArrayBufferViewType;
#else
typedef uint32_t JSArrayBufferViewType;
#endif /* __cplusplus */

/*
 * Create a new typed array with nelements elements.
 */

extern JS_FRIEND_API(JSObject *)
JS_NewInt8Array(JSContext *cx, uint32_t nelements);
extern JS_FRIEND_API(JSObject *)
JS_NewUint8Array(JSContext *cx, uint32_t nelements);
extern JS_FRIEND_API(JSObject *)
JS_NewUint8ClampedArray(JSContext *cx, uint32_t nelements);

extern JS_FRIEND_API(JSObject *)
JS_NewInt16Array(JSContext *cx, uint32_t nelements);
extern JS_FRIEND_API(JSObject *)
JS_NewUint16Array(JSContext *cx, uint32_t nelements);
extern JS_FRIEND_API(JSObject *)
JS_NewInt32Array(JSContext *cx, uint32_t nelements);
extern JS_FRIEND_API(JSObject *)
JS_NewUint32Array(JSContext *cx, uint32_t nelements);
extern JS_FRIEND_API(JSObject *)
JS_NewFloat32Array(JSContext *cx, uint32_t nelements);
extern JS_FRIEND_API(JSObject *)
JS_NewFloat64Array(JSContext *cx, uint32_t nelements);

/*
 * Create a new typed array and copy in values from the given object. The
 * object is used as if it were an array; that is, the new array (if
 * successfully created) will have length given by array.length, and its
 * elements will be those specified by array[0], array[1], and so on, after
 * conversion to the typed array element type.
 */

extern JS_FRIEND_API(JSObject *)
JS_NewInt8ArrayFromArray(JSContext *cx, JSObject *array);
extern JS_FRIEND_API(JSObject *)
JS_NewUint8ArrayFromArray(JSContext *cx, JSObject *array);
extern JS_FRIEND_API(JSObject *)
JS_NewUint8ClampedArrayFromArray(JSContext *cx, JSObject *array);
extern JS_FRIEND_API(JSObject *)
JS_NewInt16ArrayFromArray(JSContext *cx, JSObject *array);
extern JS_FRIEND_API(JSObject *)
JS_NewUint16ArrayFromArray(JSContext *cx, JSObject *array);
extern JS_FRIEND_API(JSObject *)
JS_NewInt32ArrayFromArray(JSContext *cx, JSObject *array);
extern JS_FRIEND_API(JSObject *)
JS_NewUint32ArrayFromArray(JSContext *cx, JSObject *array);
extern JS_FRIEND_API(JSObject *)
JS_NewFloat32ArrayFromArray(JSContext *cx, JSObject *array);
extern JS_FRIEND_API(JSObject *)
JS_NewFloat64ArrayFromArray(JSContext *cx, JSObject *array);

/*
 * Create a new typed array using the given ArrayBuffer for storage. byteOffset
 * must not exceed (signed) INT32_MAX. The length value is optional; if -1 is
 * passed, enough elements to use up the remainder of the byte array is used as
 * the default value.
 */

extern JS_FRIEND_API(JSObject *)
JS_NewInt8ArrayWithBuffer(JSContext *cx, JSObject *arrayBuffer,
                          uint32_t byteOffset, int32_t length);
extern JS_FRIEND_API(JSObject *)
JS_NewUint8ArrayWithBuffer(JSContext *cx, JSObject *arrayBuffer,
                           uint32_t byteOffset, int32_t length);
extern JS_FRIEND_API(JSObject *)
JS_NewUint8ClampedArrayWithBuffer(JSContext *cx, JSObject *arrayBuffer,
                                  uint32_t byteOffset, int32_t length);
extern JS_FRIEND_API(JSObject *)
JS_NewInt16ArrayWithBuffer(JSContext *cx, JSObject *arrayBuffer,
                           uint32_t byteOffset, int32_t length);
extern JS_FRIEND_API(JSObject *)
JS_NewUint16ArrayWithBuffer(JSContext *cx, JSObject *arrayBuffer,
                            uint32_t byteOffset, int32_t length);
extern JS_FRIEND_API(JSObject *)
JS_NewInt32ArrayWithBuffer(JSContext *cx, JSObject *arrayBuffer,
                           uint32_t byteOffset, int32_t length);
extern JS_FRIEND_API(JSObject *)
JS_NewUint32ArrayWithBuffer(JSContext *cx, JSObject *arrayBuffer,
                            uint32_t byteOffset, int32_t length);
extern JS_FRIEND_API(JSObject *)
JS_NewFloat32ArrayWithBuffer(JSContext *cx, JSObject *arrayBuffer,
                             uint32_t byteOffset, int32_t length);
extern JS_FRIEND_API(JSObject *)
JS_NewFloat64ArrayWithBuffer(JSContext *cx, JSObject *arrayBuffer,
                             uint32_t byteOffset, int32_t length);

/*
 * Create a new ArrayBuffer with the given byte length.
 */
extern JS_FRIEND_API(JSObject *)
JS_NewArrayBuffer(JSContext *cx, uint32_t nbytes);

/*
 * Check whether obj supports JS_GetTypedArray* APIs. Note that this may return
 * false if a security wrapper is encountered that denies the unwrapping. If
 * this test or one of the JS_Is*Array tests succeeds, then it is safe to call
 * the various accessor JSAPI calls defined below.
 */
extern JS_FRIEND_API(JSBool)
JS_IsTypedArrayObject(JSObject *obj, JSContext *cx);

/*
 * Test for specific typed array types (ArrayBufferView subtypes)
 */

extern JS_FRIEND_API(JSBool)
JS_IsInt8Array(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(JSBool)
JS_IsUint8Array(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(JSBool)
JS_IsUint8ClampedArray(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(JSBool)
JS_IsInt16Array(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(JSBool)
JS_IsUint16Array(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(JSBool)
JS_IsInt32Array(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(JSBool)
JS_IsUint32Array(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(JSBool)
JS_IsFloat32Array(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(JSBool)
JS_IsFloat64Array(JSObject *obj, JSContext *cx);

/*
 * Get the type of elements in a typed array.
 *
 * |obj| must have passed a JS_IsTypedArrayObject/JS_Is*Array test, or somehow
 * be known that it would pass such a test: it is a typed array or a wrapper of
 * a typed array, and the unwrapping will succeed. If cx is NULL, then DEBUG
 * builds may be unable to assert when unwrapping should be disallowed.
 */
extern JS_FRIEND_API(JSArrayBufferViewType)
JS_GetTypedArrayType(JSObject *obj, JSContext *cx);

/*
 * Check whether obj supports the JS_GetArrayBuffer* APIs. Note that this may
 * return false if a security wrapper is encountered that denies the
 * unwrapping. If this test succeeds, then it is safe to call the various
 * accessor JSAPI calls defined below.
 */
extern JS_FRIEND_API(JSBool)
JS_IsArrayBufferObject(JSObject *obj, JSContext *cx);

/*
 * Return the available byte length of an array buffer.
 *
 * |obj| must have passed a JS_IsArrayBufferObject test, or somehow be known
 * that it would pass such a test: it is an ArrayBuffer or a wrapper of an
 * ArrayBuffer, and the unwrapping will succeed. If cx is NULL, then DEBUG
 * builds may be unable to assert when unwrapping should be disallowed.
 */
extern JS_FRIEND_API(uint32_t)
JS_GetArrayBufferByteLength(JSObject *obj, JSContext *cx);

/*
 * Return a pointer to an array buffer's data. The buffer is still owned by the
 * array buffer object, and should not be modified on another thread.
 *
 * |obj| must have passed a JS_IsArrayBufferObject test, or somehow be known
 * that it would pass such a test: it is an ArrayBuffer or a wrapper of an
 * ArrayBuffer, and the unwrapping will succeed. If cx is NULL, then DEBUG
 * builds may be unable to assert when unwrapping should be disallowed.
 */
extern JS_FRIEND_API(uint8_t *)
JS_GetArrayBufferData(JSObject *obj, JSContext *cx);

/*
 * Return the number of elements in a typed array.
 *
 * |obj| must have passed a JS_IsTypedArrayObject/JS_Is*Array test, or somehow
 * be known that it would pass such a test: it is a typed array or a wrapper of
 * a typed array, and the unwrapping will succeed. If cx is NULL, then DEBUG
 * builds may be unable to assert when unwrapping should be disallowed.
 */
extern JS_FRIEND_API(uint32_t)
JS_GetTypedArrayLength(JSObject *obj, JSContext *cx);

/*
 * Return the byte offset from the start of an array buffer to the start of a
 * typed array view.
 *
 * |obj| must have passed a JS_IsTypedArrayObject/JS_Is*Array test, or somehow
 * be known that it would pass such a test: it is a typed array or a wrapper of
 * a typed array, and the unwrapping will succeed. If cx is NULL, then DEBUG
 * builds may be unable to assert when unwrapping should be disallowed.
 */
extern JS_FRIEND_API(uint32_t)
JS_GetTypedArrayByteOffset(JSObject *obj, JSContext *cx);

/*
 * Return the byte length of a typed array.
 *
 * |obj| must have passed a JS_IsTypedArrayObject/JS_Is*Array test, or somehow
 * be known that it would pass such a test: it is a typed array or a wrapper of
 * a typed array, and the unwrapping will succeed. If cx is NULL, then DEBUG
 * builds may be unable to assert when unwrapping should be disallowed.
 */
extern JS_FRIEND_API(uint32_t)
JS_GetTypedArrayByteLength(JSObject *obj, JSContext *cx);

/*
 * More generic name for JS_GetTypedArrayByteLength to cover DataViews as well
 */
extern JS_FRIEND_API(uint32_t)
JS_GetArrayBufferViewByteLength(JSObject *obj, JSContext *cx);

/*
 * Return a pointer to the start of the data referenced by a typed array. The
 * data is still owned by the typed array, and should not be modified on
 * another thread.
 *
 * |obj| must have passed a JS_Is*Array test, or somehow be known that it would
 * pass such a test: it is a typed array or a wrapper of a typed array, and the
 * unwrapping will succeed. If cx is NULL, then DEBUG builds may be unable to
 * assert when unwrapping should be disallowed.
 */

extern JS_FRIEND_API(int8_t *)
JS_GetInt8ArrayData(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(uint8_t *)
JS_GetUint8ArrayData(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(uint8_t *)
JS_GetUint8ClampedArrayData(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(int16_t *)
JS_GetInt16ArrayData(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(uint16_t *)
JS_GetUint16ArrayData(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(int32_t *)
JS_GetInt32ArrayData(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(uint32_t *)
JS_GetUint32ArrayData(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(float *)
JS_GetFloat32ArrayData(JSObject *obj, JSContext *cx);
extern JS_FRIEND_API(double *)
JS_GetFloat64ArrayData(JSObject *obj, JSContext *cx);

/*
 * Same as above, but for any kind of ArrayBufferView. Prefer the type-specific
 * versions when possible.
 */
extern JS_FRIEND_API(void *)
JS_GetArrayBufferViewData(JSObject *obj, JSContext *cx);

#endif /* jsfriendapi_h___ */