/* -*- 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/. */

/*
 * JavaScript API.
 */

#include "jsapi.h"

#include "mozilla/FloatingPoint.h"
#include "mozilla/PodOperations.h"
#include "mozilla/ThreadLocal.h"

#include <ctype.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

#include "jstypes.h"
#include "jsutil.h"
#include "jsprf.h"
#include "jsarray.h"
#include "jsatom.h"
#include "jsbool.h"
#include "jsclone.h"
#include "jscntxt.h"
#include "jsdate.h"
#include "jsdtoa.h"
#include "jsexn.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsiter.h"
#include "jslock.h"
#include "jsmath.h"
#include "jsnativestack.h"
#include "jsnum.h"
#include "json.h"
#include "jsobj.h"
#include "jsproxy.h"
#include "jsscript.h"
#include "jsstr.h"
#include "prmjtime.h"
#include "jsweakmap.h"
#include "jswrapper.h"
#include "jstypedarray.h"
#ifdef JS_THREADSAFE
#include "jsworkers.h"
#endif

#include "builtin/Eval.h"
#include "builtin/Intl.h"
#include "builtin/MapObject.h"
#include "builtin/RegExp.h"
#include "builtin/ParallelArray.h"
#include "frontend/BytecodeCompiler.h"
#include "frontend/FullParseHandler.h"  // for JS_BufferIsCompileableUnit
#include "frontend/Parser.h" // for JS_BufferIsCompileableUnit
#include "gc/Marking.h"
#include "gc/Memory.h"
#include "jit/AsmJS.h"
#include "jit/PcScriptCache.h"
#include "js/CharacterEncoding.h"
#include "vm/Debugger.h"
#include "vm/Interpreter.h"
#include "vm/NumericConversions.h"
#include "vm/Shape.h"
#include "vm/StopIterationObject.h"
#include "vm/StringBuffer.h"
#include "vm/WeakMapObject.h"
#include "vm/Xdr.h"
#include "yarr/BumpPointerAllocator.h"

#include "jsatominlines.h"
#include "jsinferinlines.h"
#include "jsscriptinlines.h"

#include "vm/Interpreter-inl.h"
#include "vm/ObjectImpl-inl.h"
#include "vm/RegExpObject-inl.h"
#include "vm/RegExpStatics-inl.h"
#include "vm/Shape-inl.h"
#include "vm/String-inl.h"

#if ENABLE_YARR_JIT
#include "assembler/jit/ExecutableAllocator.h"
#endif

#ifdef JS_ION
#include "jit/Ion.h"
#endif

#include "nb/memory_scope.h"
#include "starboard/file.h"

using namespace js;
using namespace js::gc;
using namespace js::types;

using mozilla::Maybe;
using mozilla::PodCopy;
using mozilla::PodZero;

using js::frontend::Parser;

bool
JS::detail::CallMethodIfWrapped(JSContext *cx, IsAcceptableThis test, NativeImpl impl,
                               CallArgs args)
{
    TRACK_MEMORY_SCOPE("Javascript");
    const Value &thisv = args.thisv();
    JS_ASSERT(!test(thisv));

    if (thisv.isObject()) {
        JSObject &thisObj = args.thisv().toObject();
        if (thisObj.isProxy())
            return Proxy::nativeCall(cx, test, impl, args);
    }

    ReportIncompatible(cx, args);
    return false;
}

#ifdef HAVE_VA_LIST_AS_ARRAY
#define JS_ADDRESSOF_VA_LIST(ap) ((va_list *)(ap))
#else
#define JS_ADDRESSOF_VA_LIST(ap) (&(ap))
#endif

#ifdef JS_USE_JSID_STRUCT_TYPES
const jsid JSID_VOID  = { size_t(JSID_TYPE_VOID) };
const jsid JSID_EMPTY = { size_t(JSID_TYPE_OBJECT) };
#endif

const jsval JSVAL_NULL  = IMPL_TO_JSVAL(BUILD_JSVAL(JSVAL_TAG_NULL,      0));
const jsval JSVAL_ZERO  = IMPL_TO_JSVAL(BUILD_JSVAL(JSVAL_TAG_INT32,     0));
const jsval JSVAL_ONE   = IMPL_TO_JSVAL(BUILD_JSVAL(JSVAL_TAG_INT32,     1));
const jsval JSVAL_FALSE = IMPL_TO_JSVAL(BUILD_JSVAL(JSVAL_TAG_BOOLEAN,   JS_FALSE));
const jsval JSVAL_TRUE  = IMPL_TO_JSVAL(BUILD_JSVAL(JSVAL_TAG_BOOLEAN,   JS_TRUE));
const jsval JSVAL_VOID  = IMPL_TO_JSVAL(BUILD_JSVAL(JSVAL_TAG_UNDEFINED, 0));
const HandleValue JS::NullHandleValue =
    HandleValue::fromMarkedLocation(&JSVAL_NULL);
const HandleValue JS::UndefinedHandleValue =
    HandleValue::fromMarkedLocation(&JSVAL_VOID);

const jsid voidIdValue = JSID_VOID;
const jsid emptyIdValue = JSID_EMPTY;
const HandleId JS::JSID_VOIDHANDLE = HandleId::fromMarkedLocation(&voidIdValue);
const HandleId JS::JSID_EMPTYHANDLE = HandleId::fromMarkedLocation(&emptyIdValue);

/* Make sure that jschar is two bytes unsigned integer */
JS_STATIC_ASSERT((jschar)-1 > 0);
JS_STATIC_ASSERT(sizeof(jschar) == 2);

JS_PUBLIC_API(int64_t)
JS_Now()
{
    return PRMJ_Now();
}

JS_PUBLIC_API(jsval)
JS_GetNaNValue(JSContext *cx)
{
    return cx->runtime()->NaNValue;
}

JS_PUBLIC_API(jsval)
JS_GetNegativeInfinityValue(JSContext *cx)
{
    return cx->runtime()->negativeInfinityValue;
}

JS_PUBLIC_API(jsval)
JS_GetPositiveInfinityValue(JSContext *cx)
{
    return cx->runtime()->positiveInfinityValue;
}

JS_PUBLIC_API(jsval)
JS_GetEmptyStringValue(JSContext *cx)
{
    return STRING_TO_JSVAL(cx->runtime()->emptyString);
}

JS_PUBLIC_API(JSString *)
JS_GetEmptyString(JSRuntime *rt)
{
    JS_ASSERT(rt->hasContexts());
    return rt->emptyString;
}

static void
AssertHeapIsIdle(JSRuntime *rt)
{
    JS_ASSERT(rt->heapState == js::Idle);
}

static void
AssertHeapIsIdle(JSContext *cx)
{
    AssertHeapIsIdle(cx->runtime());
}

static void
AssertHeapIsIdleOrIterating(JSRuntime *rt)
{
    JS_ASSERT(!rt->isHeapCollecting());
}

static void
AssertHeapIsIdleOrIterating(JSContext *cx)
{
    AssertHeapIsIdleOrIterating(cx->runtime());
}

static void
AssertHeapIsIdleOrStringIsFlat(JSContext *cx, JSString *str)
{
    /*
     * We allow some functions to be called during a GC as long as the argument
     * is a flat string, since that will not cause allocation.
     */
    JS_ASSERT_IF(cx->runtime()->isHeapBusy(), str->isFlat());
}

JS_PUBLIC_API(JSBool)
JS_ConvertArguments(JSContext *cx, unsigned argc, jsval *argv, const char *format, ...)
{
    TRACK_MEMORY_SCOPE("Javascript");
    va_list ap;
    JSBool ok;

    AssertHeapIsIdle(cx);

    va_start(ap, format);
    ok = JS_ConvertArgumentsVA(cx, argc, argv, format, ap);
    va_end(ap);
    return ok;
}

JS_PUBLIC_API(JSBool)
JS_ConvertArgumentsVA(JSContext *cx, unsigned argc, jsval *argv, const char *format, va_list ap)
{
    TRACK_MEMORY_SCOPE("Javascript");
    jsval *sp;
    JSBool required;
    char c;
    double d;
    JSString *str;
    RootedObject obj(cx);
    RootedValue val(cx);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, JSValueArray(argv - 2, argc + 2));
    sp = argv;
    required = JS_TRUE;
    while ((c = *format++) != '\0') {
        if (isspace(c))
            continue;
        if (c == '/') {
            required = JS_FALSE;
            continue;
        }
        if (sp == argv + argc) {
            if (required) {
                if (JSFunction *fun = ReportIfNotFunction(cx, argv[-2])) {
                    char numBuf[12];
                    JS_snprintf(numBuf, sizeof numBuf, "%u", argc);
                    JSAutoByteString funNameBytes;
                    if (const char *name = GetFunctionNameBytes(cx, fun, &funNameBytes)) {
                        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_MORE_ARGS_NEEDED,
                                             name, numBuf, (argc == 1) ? "" : "s");
                    }
                }
                return JS_FALSE;
            }
            break;
        }
        switch (c) {
          case 'b':
            *va_arg(ap, JSBool *) = ToBoolean(*sp);
            break;
          case 'c':
            if (!JS_ValueToUint16(cx, *sp, va_arg(ap, uint16_t *)))
                return JS_FALSE;
            break;
          case 'i':
            if (!JS_ValueToECMAInt32(cx, *sp, va_arg(ap, int32_t *)))
                return JS_FALSE;
            break;
          case 'u':
            if (!JS_ValueToECMAUint32(cx, *sp, va_arg(ap, uint32_t *)))
                return JS_FALSE;
            break;
          case 'j':
            if (!JS_ValueToInt32(cx, *sp, va_arg(ap, int32_t *)))
                return JS_FALSE;
            break;
          case 'd':
            if (!JS_ValueToNumber(cx, *sp, va_arg(ap, double *)))
                return JS_FALSE;
            break;
          case 'I':
            if (!JS_ValueToNumber(cx, *sp, &d))
                return JS_FALSE;
            *va_arg(ap, double *) = ToInteger(d);
            break;
          case 'S':
          case 'W':
            val = *sp;
            str = ToString<CanGC>(cx, val);
            if (!str)
                return JS_FALSE;
            *sp = STRING_TO_JSVAL(str);
            if (c == 'W') {
                JSStableString *stable = str->ensureStable(cx);
                if (!stable)
                    return JS_FALSE;
                *va_arg(ap, const jschar **) = stable->chars().get();
            } else {
                *va_arg(ap, JSString **) = str;
            }
            break;
          case 'o':
            if (!js_ValueToObjectOrNull(cx, *sp, &obj))
                return JS_FALSE;
            *sp = OBJECT_TO_JSVAL(obj);
            *va_arg(ap, JSObject **) = obj;
            break;
          case 'f':
            obj = ReportIfNotFunction(cx, *sp);
            if (!obj)
                return JS_FALSE;
            *sp = OBJECT_TO_JSVAL(obj);
            *va_arg(ap, JSFunction **) = &obj->as<JSFunction>();
            break;
          case 'v':
            *va_arg(ap, jsval *) = *sp;
            break;
          case '*':
            break;
          default:
            JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_CHAR, format);
            return JS_FALSE;
        }
        sp++;
    }
    return JS_TRUE;
}

JS_PUBLIC_API(JSBool)
JS_ConvertValue(JSContext *cx, jsval valueArg, JSType type, jsval *vp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedValue value(cx, valueArg);
    JSBool ok;
    RootedObject obj(cx);
    JSString *str;
    double d;

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    switch (type) {
      case JSTYPE_VOID:
        *vp = JSVAL_VOID;
        ok = JS_TRUE;
        break;
      case JSTYPE_OBJECT:
        ok = js_ValueToObjectOrNull(cx, value, &obj);
        if (ok)
            *vp = OBJECT_TO_JSVAL(obj);
        break;
      case JSTYPE_FUNCTION:
        *vp = value;
        obj = ReportIfNotFunction(cx, *vp);
        ok = (obj != NULL);
        break;
      case JSTYPE_STRING:
        str = ToString<CanGC>(cx, value);
        ok = (str != NULL);
        if (ok)
            *vp = STRING_TO_JSVAL(str);
        break;
      case JSTYPE_NUMBER:
        ok = JS_ValueToNumber(cx, value, &d);
        if (ok)
            *vp = DOUBLE_TO_JSVAL(d);
        break;
      case JSTYPE_BOOLEAN:
        *vp = BooleanValue(ToBoolean(value));
        return JS_TRUE;
      default: {
        char numBuf[12];
        JS_snprintf(numBuf, sizeof numBuf, "%d", (int)type);
        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_TYPE, numBuf);
        ok = JS_FALSE;
        break;
      }
    }
    return ok;
}

JS_PUBLIC_API(JSBool)
JS_ValueToObject(JSContext *cx, jsval valueArg, JSObject **objpArg)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedValue value(cx, valueArg);
    RootedObject objp(cx, *objpArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    if (!js_ValueToObjectOrNull(cx, value, &objp))
        return false;
    *objpArg = objp;
    return true;
}

JS_PUBLIC_API(JSFunction *)
JS_ValueToFunction(JSContext *cx, jsval valueArg)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    return ReportIfNotFunction(cx, value);
}

JS_PUBLIC_API(JSFunction *)
JS_ValueToConstructor(JSContext *cx, jsval valueArg)
{
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    return ReportIfNotFunction(cx, value);
}

JS_PUBLIC_API(JSString *)
JS_ValueToString(JSContext *cx, jsval valueArg)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    return ToString<CanGC>(cx, value);
}

JS_PUBLIC_API(JSString *)
JS_ValueToSource(JSContext *cx, jsval valueArg)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    return ValueToSource(cx, value);
}

JS_PUBLIC_API(JSBool)
JS_ValueToNumber(JSContext *cx, jsval valueArg, double *dp)
{
    RootedValue value(cx, valueArg);
    return JS::ToNumber(cx, value, dp);
}

JS_PUBLIC_API(JSBool)
JS_DoubleIsInt32(double d, int32_t *ip)
{
    return mozilla::DoubleIsInt32(d, ip);
}

JS_PUBLIC_API(int32_t)
JS_DoubleToInt32(double d)
{
    return ToInt32(d);
}

JS_PUBLIC_API(uint32_t)
JS_DoubleToUint32(double d)
{
    return ToUint32(d);
}

JS_PUBLIC_API(JSBool)
JS_ValueToECMAInt32(JSContext *cx, jsval valueArg, int32_t *ip)
{
  TRACK_MEMORY_SCOPE("Javascript");
    RootedValue value(cx, valueArg);
    return JS::ToInt32(cx, value, ip);
}

JS_PUBLIC_API(JSBool)
JS_ValueToECMAUint32(JSContext *cx, jsval valueArg, uint32_t *ip)
{
  TRACK_MEMORY_SCOPE("Javascript");
    RootedValue value(cx, valueArg);
    return JS::ToUint32(cx, value, ip);
}

JS_PUBLIC_API(JSBool)
JS_ValueToInt64(JSContext *cx, jsval valueArg, int64_t *ip)
{
    RootedValue value(cx, valueArg);
    return JS::ToInt64(cx, value, ip);
}

JS_PUBLIC_API(JSBool)
JS_ValueToUint64(JSContext *cx, jsval valueArg, uint64_t *ip)
{
    RootedValue value(cx, valueArg);
    return JS::ToUint64(cx, value, ip);
}

JS_PUBLIC_API(JSBool)
JS_ValueToInt32(JSContext *cx, jsval vArg, int32_t *ip)
{
  TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RootedValue v(cx, vArg);
    assertSameCompartment(cx, v);

    if (v.isInt32()) {
        *ip = v.toInt32();
        return true;
    }

    double d;
    if (v.isDouble()) {
        d = v.toDouble();
    } else if (!ToNumberSlow(cx, v, &d)) {
        return false;
    }

    if (mozilla::IsNaN(d) || d <= -2147483649.0 || 2147483648.0 <= d) {
        js_ReportValueError(cx, JSMSG_CANT_CONVERT,
                            JSDVG_SEARCH_STACK, v, NullPtr());
        return false;
    }

    *ip = (int32_t) floor(d + 0.5);  /* Round to nearest */
    return true;
}

JS_PUBLIC_API(JSBool)
JS_ValueToUint16(JSContext *cx, jsval valueArg, uint16_t *ip)
{
    RootedValue value(cx, valueArg);
    return ToUint16(cx, value, ip);
}

JS_PUBLIC_API(JSBool)
JS_ValueToBoolean(JSContext *cx, jsval value, JSBool *bp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    *bp = ToBoolean(value);
    return JS_TRUE;
}

JS_PUBLIC_API(JSType)
JS_TypeOfValue(JSContext *cx, jsval valueArg)
{
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    return TypeOfValue(cx, value);
}

JS_PUBLIC_API(const char *)
JS_GetTypeName(JSContext *cx, JSType type)
{
    if ((unsigned)type >= (unsigned)JSTYPE_LIMIT)
        return NULL;
    return TypeStrings[type];
}

JS_PUBLIC_API(JSBool)
JS_StrictlyEqual(JSContext *cx, jsval value1, jsval value2, JSBool *equal)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value1, value2);
    bool eq;
    if (!StrictlyEqual(cx, value1, value2, &eq))
        return false;
    *equal = eq;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_LooselyEqual(JSContext *cx, jsval value1Arg, jsval value2Arg, JSBool *equal)
{
    RootedValue value1(cx, value1Arg);
    RootedValue value2(cx, value2Arg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value1, value2);
    bool eq;
    if (!LooselyEqual(cx, value1, value2, &eq))
        return false;
    *equal = eq;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_SameValue(JSContext *cx, jsval value1, jsval value2, JSBool *same)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value1, value2);
    bool s;
    if (!SameValue(cx, value1, value2, &s))
        return false;
    *same = s;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_IsBuiltinEvalFunction(JSFunction *fun)
{
    return IsAnyBuiltinEval(fun);
}

JS_PUBLIC_API(JSBool)
JS_IsBuiltinFunctionConstructor(JSFunction *fun)
{
    return IsBuiltinFunctionConstructor(fun);
}

/************************************************************************/

/*
 * Has a new runtime ever been created?  This flag is used to control things
 * that should happen only once across all runtimes.
 */
static JSBool js_NewRuntimeWasCalled = JS_FALSE;

/*
 * Thread Local Storage slot for storing the runtime for a thread.
 */
mozilla::ThreadLocal<PerThreadData *> js::TlsPerThreadData;

#ifdef DEBUG
JS_FRIEND_API(bool)
JS::isGCEnabled()
{
    return !TlsPerThreadData.get()->suppressGC;
}
#else
JS_FRIEND_API(bool) JS::isGCEnabled() { return true; }
#endif

static const JSSecurityCallbacks NullSecurityCallbacks = { };

static bool
JitSupportsFloatingPoint()
{
#if defined(JS_ION)
    if (!JSC::MacroAssembler().supportsFloatingPoint())
        return false;

#if defined(JS_ION) && WTF_ARM_ARCH_VERSION == 6
    if (!js::jit::hasVFP())
        return false;
#endif

    return true;
#else
    return false;
#endif
}

PerThreadData::PerThreadData(JSRuntime *runtime)
  : PerThreadDataFriendFields(),
    runtime_(runtime),
    ionTop(NULL),
    ionJSContext(NULL),
    ionStackLimit(0),
    activation_(NULL),
    asmJSActivationStack_(NULL),
    suppressGC(0)
{}

JSRuntime::JSRuntime(JSUseHelperThreads useHelperThreads)
  : mainThread(this),
    interrupt(0),
#ifdef JS_THREADSAFE
    operationCallbackLock(NULL),
#ifdef DEBUG
    operationCallbackOwner(NULL),
#endif
#endif
    atomsCompartment(NULL),
    systemZone(NULL),
    numCompartments(0),
    localeCallbacks(NULL),
    defaultLocale(NULL),
    defaultVersion_(JSVERSION_DEFAULT),
#ifdef JS_THREADSAFE
    ownerThread_(NULL),
#endif
    tempLifoAlloc(TEMP_LIFO_ALLOC_PRIMARY_CHUNK_SIZE),
    freeLifoAlloc(TEMP_LIFO_ALLOC_PRIMARY_CHUNK_SIZE),
#if ENABLE_ASSEMBLER
    execAlloc_(NULL),
#endif
    bumpAlloc_(NULL),
    ionRuntime_(NULL),
    selfHostingGlobal_(NULL),
    selfHostedClasses_(NULL),
    nativeStackBase(0),
    nativeStackQuota(0),
    interpreterFrames(NULL),
    cxCallback(NULL),
    destroyCompartmentCallback(NULL),
    destroyZoneCallback(NULL),
    sweepZoneCallback(NULL),
    compartmentNameCallback(NULL),
    activityCallback(NULL),
    activityCallbackArg(NULL),
#ifdef JS_THREADSAFE
    requestDepth(0),
# ifdef DEBUG
    checkRequestDepth(0),
# endif
#endif
    gcSystemAvailableChunkListHead(NULL),
    gcUserAvailableChunkListHead(NULL),
    gcKeepAtoms(0),
    gcBytes(0),
    gcMaxBytes(0),
    gcMaxMallocBytes(0),
    gcNumArenasFreeCommitted(0),
    gcMarker(this),
    gcVerifyPreData(NULL),
    gcVerifyPostData(NULL),
    gcChunkAllocationSinceLastGC(false),
    gcNextFullGCTime(0),
    gcLastGCTime(0),
    gcJitReleaseTime(0),
    gcMode(JSGC_MODE_GLOBAL),
    gcAllocationThreshold(30 * 1024 * 1024),
    gcHighFrequencyGC(false),
    gcHighFrequencyTimeThreshold(1000),
    gcHighFrequencyLowLimitBytes(100 * 1024 * 1024),
    gcHighFrequencyHighLimitBytes(500 * 1024 * 1024),
    gcHighFrequencyHeapGrowthMax(3.0),
    gcHighFrequencyHeapGrowthMin(1.5),
    gcLowFrequencyHeapGrowth(1.5),
    gcDynamicHeapGrowth(false),
    gcDynamicMarkSlice(false),
    gcDecommitThreshold(32 * 1024 * 1024),
    gcShouldCleanUpEverything(false),
    gcGrayBitsValid(false),
    gcIsNeeded(0),
    gcStats(thisFromCtor()),
    gcNumber(0),
    gcStartNumber(0),
    gcIsFull(false),
    gcTriggerReason(JS::gcreason::NO_REASON),
    gcStrictCompartmentChecking(false),
#ifdef DEBUG
    gcDisableStrictProxyCheckingCount(0),
#endif
    gcIncrementalState(gc::NO_INCREMENTAL),
    gcLastMarkSlice(false),
    gcSweepOnBackgroundThread(false),
    gcFoundBlackGrayEdges(false),
    gcSweepingZones(NULL),
    gcZoneGroupIndex(0),
    gcZoneGroups(NULL),
    gcCurrentZoneGroup(NULL),
    gcSweepPhase(0),
    gcSweepZone(NULL),
    gcSweepKindIndex(0),
    gcAbortSweepAfterCurrentGroup(false),
    gcArenasAllocatedDuringSweep(NULL),
#ifdef DEBUG
    gcMarkingValidator(NULL),
#endif
    gcInterFrameGC(0),
    gcSliceBudget(SliceBudget::Unlimited),
    gcIncrementalEnabled(true),
    gcGenerationalEnabled(true),
    gcManipulatingDeadZones(false),
    gcObjectsMarkedInDeadZones(0),
    gcPoke(false),
    heapState(Idle),
#ifdef JSGC_GENERATIONAL
    gcNursery(thisFromCtor()),
    gcStoreBuffer(thisFromCtor()),
#endif
#ifdef JS_GC_ZEAL
    gcZeal_(0),
    gcZealFrequency(0),
    gcNextScheduled(0),
    gcDeterministicOnly(false),
    gcIncrementalLimit(0),
#endif
    gcValidate(true),
    gcFullCompartmentChecks(false),
    gcCallback(NULL),
    gcSliceCallback(NULL),
    gcFinalizeCallback(NULL),
    analysisPurgeCallback(NULL),
    analysisPurgeTriggerBytes(0),
    gcMallocBytes(0),
    autoGCRooters(NULL),
    scriptAndCountsVector(NULL),
    NaNValue(UndefinedValue()),
    negativeInfinityValue(UndefinedValue()),
    positiveInfinityValue(UndefinedValue()),
    emptyString(NULL),
    sourceHook(NULL),
    debugMode(false),
    spsProfiler(thisFromCtor()),
    profilingScripts(false),
    alwaysPreserveCode(false),
    hadOutOfMemory(false),
    data(NULL),
    gcLock(NULL),
    gcHelperThread(thisFromCtor()),
#ifdef JS_THREADSAFE
#ifdef JS_ION
    workerThreadState(NULL),
#endif
    sourceCompressorThread(),
#endif
    defaultFreeOp_(thisFromCtor(), false),
    debuggerMutations(0),
    securityCallbacks(const_cast<JSSecurityCallbacks *>(&NullSecurityCallbacks)),
    DOMcallbacks(NULL),
    destroyPrincipals(NULL),
    structuredCloneCallbacks(NULL),
    telemetryCallback(NULL),
    propertyRemovals(0),
#if !ENABLE_INTL_API
    thousandsSeparator(0),
    decimalSeparator(0),
    numGrouping(0),
#endif
    mathCache_(NULL),
    dtoaState(NULL),
    activeCompilations(0),
    trustedPrincipals_(NULL),
    wrapObjectCallback(TransparentObjectWrapper),
    sameCompartmentWrapObjectCallback(NULL),
    preWrapObjectCallback(NULL),
    preserveWrapperCallback(NULL),
#ifdef DEBUG
    noGCOrAllocationCheck(0),
#endif
    jitHardening(false),
    jitSupportsFloatingPoint(false),
    ionPcScriptCache(NULL),
    threadPool(this),
    ctypesActivityCallback(NULL),
    parallelWarmup(0),
    ionReturnOverride_(MagicValue(JS_ARG_POISON)),
    useHelperThreads_(useHelperThreads),
    requestedHelperThreadCount(-1)
#ifdef DEBUG
    , enteredPolicy(NULL)
#endif
{
    /* Initialize infallibly first, so we can goto bad and JS_DestroyRuntime. */
    JS_INIT_CLIST(&onNewGlobalObjectWatchers);

    PodZero(&debugHooks);
    PodZero(&atomState);

#if JS_STACK_GROWTH_DIRECTION > 0
    nativeStackLimit = UINTPTR_MAX;
#endif
}

bool
JSRuntime::init(uint32_t maxbytes)
{
    TRACK_MEMORY_SCOPE("Javascript");
#ifdef JS_THREADSAFE
    ownerThread_ = PR_GetCurrentThread();

    operationCallbackLock = PR_NewLock();
    if (!operationCallbackLock)
        return false;
#endif

    js::TlsPerThreadData.set(&mainThread);

    if (!js_InitGC(this, maxbytes))
        return false;

    if (!gcMarker.init())
        return false;

#if !defined(STARBOARD)
    const char *size = getenv("JSGC_MARK_STACK_LIMIT");
    if (size)
        SetMarkStackLimit(this, atoi(size));
#endif

    ScopedJSDeletePtr<Zone> atomsZone(new_<Zone>(this));
    if (!atomsZone)
        return false;

    JS::CompartmentOptions options;
    ScopedJSDeletePtr<JSCompartment> atomsCompartment(new_<JSCompartment>(atomsZone.get(), options));
    if (!atomsCompartment || !atomsCompartment->init(NULL))
        return false;

    zones.append(atomsZone.get());
    atomsZone->compartments.append(atomsCompartment.get());

    atomsCompartment->isSystem = true;
    atomsZone->isSystem = true;
    atomsZone->setGCLastBytes(8192, GC_NORMAL);

    atomsZone.forget();
    this->atomsCompartment = atomsCompartment.forget();

    if (!InitAtoms(this))
        return false;

    if (!InitRuntimeNumberState(this))
        return false;

    dtoaState = js_NewDtoaState();
    if (!dtoaState)
        return false;

    dateTimeInfo.updateTimeZoneAdjustment();

    if (!scriptDataTable.init())
        return false;

    if (!threadPool.init())
        return false;

#ifdef JS_THREADSAFE
    if (useHelperThreads() && !sourceCompressorThread.init())
        return false;
#endif

    if (!evalCache.init())
        return false;

    nativeStackBase = GetNativeStackBase();

    jitSupportsFloatingPoint = JitSupportsFloatingPoint();
    return true;
}

JSRuntime::~JSRuntime()
{
#ifdef JS_THREADSAFE
    clearOwnerThread();

    JS_ASSERT(!operationCallbackOwner);
    if (operationCallbackLock)
        PR_DestroyLock(operationCallbackLock);
#endif

    /*
     * Even though all objects in the compartment are dead, we may have keep
     * some filenames around because of gcKeepAtoms.
     */
    FreeScriptData(this);

#ifdef JS_THREADSAFE
# ifdef JS_ION
    if (workerThreadState)
        js_delete(workerThreadState);
# endif
    sourceCompressorThread.finish();
#endif

#ifdef DEBUG
    /* Don't hurt everyone in leaky ol' Mozilla with a fatal JS_ASSERT! */
    if (hasContexts()) {
        unsigned cxcount = 0;
        for (ContextIter acx(this); !acx.done(); acx.next()) {
            fprintf(stderr,
"JS API usage error: found live context at %p\n",
                    (void *) acx.get());
            cxcount++;
        }
        fprintf(stderr,
"JS API usage error: %u context%s left in runtime upon JS_DestroyRuntime.\n",
                cxcount, (cxcount == 1) ? "" : "s");
    }
#endif

#if !ENABLE_INTL_API
    FinishRuntimeNumberState(this);
#endif
    FinishAtoms(this);

    if (dtoaState)
        js_DestroyDtoaState(dtoaState);

    js_FinishGC(this);
#ifdef JS_THREADSAFE
    if (gcLock)
        PR_DestroyLock(gcLock);
#endif

    js_delete(bumpAlloc_);
    js_delete(mathCache_);
#ifdef JS_ION
    js_delete(ionRuntime_);
#endif
#if ENABLE_ASSEMBLER
    js_delete(execAlloc_);  /* Delete after ionRuntime_. */
#endif

    if (ionPcScriptCache)
        js_delete(ionPcScriptCache);

#ifdef JSGC_GENERATIONAL
    gcStoreBuffer.disable();
    gcNursery.disable();
#endif
}

#ifdef JS_THREADSAFE
void
JSRuntime::setOwnerThread()
{
    JS_ASSERT(ownerThread_ == (void *)0xc1ea12);  /* "clear" */
    JS_ASSERT(requestDepth == 0);
    JS_ASSERT(js_NewRuntimeWasCalled);
    JS_ASSERT(js::TlsPerThreadData.get() == NULL);
    ownerThread_ = PR_GetCurrentThread();
    js::TlsPerThreadData.set(&mainThread);
    nativeStackBase = GetNativeStackBase();
    if (nativeStackQuota)
        JS_SetNativeStackQuota(this, nativeStackQuota);
#ifdef XP_MACOSX
    asmJSMachExceptionHandler.setCurrentThread();
#endif
}

void
JSRuntime::clearOwnerThread()
{
    assertValidThread();
    JS_ASSERT(requestDepth == 0);
    JS_ASSERT(js_NewRuntimeWasCalled);
    ownerThread_ = (void *)0xc1ea12;  /* "clear" */
    js::TlsPerThreadData.set(NULL);
    nativeStackBase = 0;
#if JS_STACK_GROWTH_DIRECTION > 0
    mainThread.nativeStackLimit = UINTPTR_MAX;
#else
    mainThread.nativeStackLimit = 0;
#endif
#ifdef XP_MACOSX
    asmJSMachExceptionHandler.clearCurrentThread();
#endif
}

JS_FRIEND_API(void)
JSRuntime::abortIfWrongThread() const
{
    if (ownerThread_ != PR_GetCurrentThread())
        MOZ_CRASH();
    if (!js::TlsPerThreadData.get()->associatedWith(this))
        MOZ_CRASH();
}

#ifdef DEBUG
JS_FRIEND_API(void)
JSRuntime::assertValidThread() const
{
    JS_ASSERT(ownerThread_ == PR_GetCurrentThread());
    JS_ASSERT(js::TlsPerThreadData.get()->associatedWith(this));
}
#endif  /* DEBUG */
#endif  /* JS_THREADSAFE */

JS_PUBLIC_API(JSRuntime *)
JS_NewRuntime(uint32_t maxbytes, JSUseHelperThreads useHelperThreads)
{
    TRACK_MEMORY_SCOPE("Javascript");
    if (!js_NewRuntimeWasCalled) {
#ifdef DEBUG
        /*
         * This code asserts that the numbers associated with the error names
         * in jsmsg.def are monotonically increasing.  It uses values for the
         * error names enumerated in jscntxt.c.  It's not a compile-time check
         * but it's better than nothing.
         */
        int errorNumber = 0;
#define MSG_DEF(name, number, count, exception, format)                       \
    JS_ASSERT(name == errorNumber++);
#include "js.msg"
#undef MSG_DEF

#define MSG_DEF(name, number, count, exception, format)                       \
    JS_BEGIN_MACRO                                                            \
        unsigned numfmtspecs = 0;                                                \
        const char *fmt;                                                      \
        for (fmt = format; *fmt != '\0'; fmt++) {                             \
            if (*fmt == '{' && isdigit(fmt[1]))                               \
                ++numfmtspecs;                                                \
        }                                                                     \
        JS_ASSERT(count == numfmtspecs);                                      \
    JS_END_MACRO;
#include "js.msg"
#undef MSG_DEF
#endif /* DEBUG */

        if (!js::TlsPerThreadData.init())
            return NULL;

        js_NewRuntimeWasCalled = JS_TRUE;
    }

    JSRuntime *rt = js_new<JSRuntime>(useHelperThreads);
    if (!rt)
        return NULL;

#if defined(JS_ION)
    if (!jit::InitializeIon())
        return NULL;
#endif

    if (!ForkJoinSlice::InitializeTLS())
        return NULL;

    if (!rt->init(maxbytes)) {
        JS_DestroyRuntime(rt);
        return NULL;
    }

    return rt;
}

JS_PUBLIC_API(void)
JS_DestroyRuntime(JSRuntime *rt)
{
    js_free(rt->defaultLocale);
    js_delete(rt);
}

JS_PUBLIC_API(void)
JS_ShutDown(void)
{
    PRMJ_NowShutdown();
}

JS_PUBLIC_API(void *)
JS_GetRuntimePrivate(JSRuntime *rt)
{
    return rt->data;
}

JS_PUBLIC_API(void)
JS_SetRuntimePrivate(JSRuntime *rt, void *data)
{
    rt->data = data;
}

#ifdef JS_THREADSAFE
static void
StartRequest(JSContext *cx)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JSRuntime *rt = cx->runtime();
    rt->assertValidThread();

    if (rt->requestDepth) {
        rt->requestDepth++;
    } else {
        /* Indicate that a request is running. */
        rt->requestDepth = 1;

        if (rt->activityCallback)
            rt->activityCallback(rt->activityCallbackArg, true);
    }
}

static void
StopRequest(JSContext *cx)
{
    JSRuntime *rt = cx->runtime();
    rt->assertValidThread();
    JS_ASSERT(rt->requestDepth != 0);
    if (rt->requestDepth != 1) {
        rt->requestDepth--;
    } else {
        rt->conservativeGC.updateForRequestEnd();
        rt->requestDepth = 0;

        if (rt->activityCallback)
            rt->activityCallback(rt->activityCallbackArg, false);
    }
}
#endif /* JS_THREADSAFE */

JS_PUBLIC_API(void)
JS_BeginRequest(JSContext *cx)
{
#ifdef JS_THREADSAFE
    cx->outstandingRequests++;
    StartRequest(cx);
#endif
}

JS_PUBLIC_API(void)
JS_EndRequest(JSContext *cx)
{
#ifdef JS_THREADSAFE
    JS_ASSERT(cx->outstandingRequests != 0);
    cx->outstandingRequests--;
    StopRequest(cx);
#endif
}

JS_PUBLIC_API(JSBool)
JS_IsInRequest(JSRuntime *rt)
{
#ifdef JS_THREADSAFE
    rt->assertValidThread();
    return rt->requestDepth != 0;
#else
    return false;
#endif
}

JS_PUBLIC_API(JSContextCallback)
JS_SetContextCallback(JSRuntime *rt, JSContextCallback cxCallback)
{
    JSContextCallback old;

    old = rt->cxCallback;
    rt->cxCallback = cxCallback;
    return old;
}

JS_PUBLIC_API(JSContext *)
JS_NewContext(JSRuntime *rt, size_t stackChunkSize)
{
    return NewContext(rt, stackChunkSize);
}

JS_PUBLIC_API(void)
JS_DestroyContext(JSContext *cx)
{
    JS_ASSERT(!cx->compartment());
    DestroyContext(cx, DCM_FORCE_GC);
}

JS_PUBLIC_API(void)
JS_DestroyContextNoGC(JSContext *cx)
{
    JS_ASSERT(!cx->compartment());
    DestroyContext(cx, DCM_NO_GC);
}

JS_PUBLIC_API(void *)
JS_GetContextPrivate(JSContext *cx)
{
    return cx->data;
}

JS_PUBLIC_API(void)
JS_SetContextPrivate(JSContext *cx, void *data)
{
    cx->data = data;
}

JS_PUBLIC_API(void *)
JS_GetSecondContextPrivate(JSContext *cx)
{
    return cx->data2;
}

JS_PUBLIC_API(void)
JS_SetSecondContextPrivate(JSContext *cx, void *data)
{
    cx->data2 = data;
}

JS_PUBLIC_API(JSRuntime *)
JS_GetRuntime(JSContext *cx)
{
    return cx->runtime();
}

JS_PUBLIC_API(JSContext *)
JS_ContextIterator(JSRuntime *rt, JSContext **iterp)
{
    JSContext *cx = *iterp;
    cx = cx ? cx->getNext() : rt->contextList.getFirst();
    *iterp = cx;
    return cx;
}

JS_PUBLIC_API(JSVersion)
JS_GetVersion(JSContext *cx)
{
    return VersionNumber(cx->findVersion());
}

JS_PUBLIC_API(void)
JS_SetVersionForCompartment(JSCompartment *compartment, JSVersion version)
{
    compartment->options().setVersion(version);
}

static struct v2smap {
    JSVersion   version;
    const char  *string;
} v2smap[] = {
    {JSVERSION_ECMA_3,  "ECMAv3"},
    {JSVERSION_1_6,     "1.6"},
    {JSVERSION_1_7,     "1.7"},
    {JSVERSION_1_8,     "1.8"},
    {JSVERSION_ECMA_5,  "ECMAv5"},
    {JSVERSION_DEFAULT, js_default_str},
    {JSVERSION_DEFAULT, "1.0"},
    {JSVERSION_DEFAULT, "1.1"},
    {JSVERSION_DEFAULT, "1.2"},
    {JSVERSION_DEFAULT, "1.3"},
    {JSVERSION_DEFAULT, "1.4"},
    {JSVERSION_DEFAULT, "1.5"},
    {JSVERSION_UNKNOWN, NULL},          /* must be last, NULL is sentinel */
};

JS_PUBLIC_API(const char *)
JS_VersionToString(JSVersion version)
{
    int i;

    for (i = 0; v2smap[i].string; i++)
        if (v2smap[i].version == version)
            return v2smap[i].string;
    return "unknown";
}

JS_PUBLIC_API(JSVersion)
JS_StringToVersion(const char *string)
{
    int i;

    for (i = 0; v2smap[i].string; i++)
        if (strcmp(v2smap[i].string, string) == 0)
            return v2smap[i].version;
    return JSVERSION_UNKNOWN;
}

JS_PUBLIC_API(uint32_t)
JS_GetOptions(JSContext *cx)
{
    /*
     * Can't check option/version synchronization here.
     * We may have been synchronized with a script version that was formerly on
     * the stack, but has now been popped.
     */
    return cx->options();
}

static unsigned
SetOptionsCommon(JSContext *cx, unsigned options)
{
    JS_ASSERT((options & JSOPTION_MASK) == options);
    unsigned oldopts = cx->options();
    unsigned newopts = options & JSOPTION_MASK;
    cx->setOptions(newopts);
    cx->updateJITEnabled();
    return oldopts;
}

JS_PUBLIC_API(uint32_t)
JS_SetOptions(JSContext *cx, uint32_t options)
{
    return SetOptionsCommon(cx, options);
}

JS_PUBLIC_API(uint32_t)
JS_ToggleOptions(JSContext *cx, uint32_t options)
{
    unsigned oldopts = cx->options();
    unsigned newopts = oldopts ^ options;
    return SetOptionsCommon(cx, newopts);
}

JS_PUBLIC_API(void)
JS_SetJitHardening(JSRuntime *rt, JSBool enabled)
{
    rt->setJitHardening(!!enabled);
}

JS_PUBLIC_API(const char *)
JS_GetImplementationVersion(void)
{
    return "JavaScript-C" MOZILLA_VERSION;
}

JS_PUBLIC_API(void)
JS_SetDestroyCompartmentCallback(JSRuntime *rt, JSDestroyCompartmentCallback callback)
{
    rt->destroyCompartmentCallback = callback;
}

JS_PUBLIC_API(void)
JS_SetDestroyZoneCallback(JSRuntime *rt, JSZoneCallback callback)
{
    rt->destroyZoneCallback = callback;
}

JS_PUBLIC_API(void)
JS_SetSweepZoneCallback(JSRuntime *rt, JSZoneCallback callback)
{
    rt->sweepZoneCallback = callback;
}

JS_PUBLIC_API(void)
JS_SetCompartmentNameCallback(JSRuntime *rt, JSCompartmentNameCallback callback)
{
    rt->compartmentNameCallback = callback;
}

JS_PUBLIC_API(JSWrapObjectCallback)
JS_SetWrapObjectCallbacks(JSRuntime *rt,
                          JSWrapObjectCallback callback,
                          JSSameCompartmentWrapObjectCallback sccallback,
                          JSPreWrapCallback precallback)
{
    JSWrapObjectCallback old = rt->wrapObjectCallback;
    rt->wrapObjectCallback = callback;
    rt->sameCompartmentWrapObjectCallback = sccallback;
    rt->preWrapObjectCallback = precallback;
    return old;
}

JS_PUBLIC_API(JSCompartment *)
JS_EnterCompartment(JSContext *cx, JSObject *target)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    JSCompartment *oldCompartment = cx->compartment();
    cx->enterCompartment(target->compartment());
    return oldCompartment;
}

JS_PUBLIC_API(JSCompartment *)
JS_EnterCompartmentOfScript(JSContext *cx, JSScript *target)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    GlobalObject &global = target->global();
    return JS_EnterCompartment(cx, &global);
}

JS_PUBLIC_API(void)
JS_LeaveCompartment(JSContext *cx, JSCompartment *oldCompartment)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    cx->leaveCompartment(oldCompartment);
}

JSAutoCompartment::JSAutoCompartment(JSContext *cx, JSObject *target)
  : cx_(cx),
    oldCompartment_(cx->compartment())
{
    AssertHeapIsIdleOrIterating(cx_);
    cx_->enterCompartment(target->compartment());
}

JSAutoCompartment::JSAutoCompartment(JSContext *cx, JSScript *target)
  : cx_(cx),
    oldCompartment_(cx->compartment())
{
    AssertHeapIsIdleOrIterating(cx_);
    cx_->enterCompartment(target->compartment());
}

JSAutoCompartment::~JSAutoCompartment()
{
    cx_->leaveCompartment(oldCompartment_);
}

JS_PUBLIC_API(void)
JS_SetCompartmentPrivate(JSCompartment *compartment, void *data)
{
    compartment->data = data;
}

JS_PUBLIC_API(void *)
JS_GetCompartmentPrivate(JSCompartment *compartment)
{
    return compartment->data;
}

JS_PUBLIC_API(void)
JS_SetZoneUserData(JS::Zone *zone, void *data)
{
    zone->data = data;
}

JS_PUBLIC_API(void *)
JS_GetZoneUserData(JS::Zone *zone)
{
    return zone->data;
}

JS_PUBLIC_API(JSBool)
JS_WrapObject(JSContext *cx, JSObject **objp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (*objp)
        JS::ExposeGCThingToActiveJS(*objp, JSTRACE_OBJECT);
    return cx->compartment()->wrap(cx, objp);
}

JS_PUBLIC_API(JSBool)
JS_WrapValue(JSContext *cx, jsval *vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (vp)
        JS::ExposeValueToActiveJS(*vp);
    RootedValue value(cx, *vp);
    bool ok = cx->compartment()->wrap(cx, &value);
    *vp = value.get();
    return ok;
}

JS_PUBLIC_API(JSBool)
JS_WrapId(JSContext *cx, jsid *idp)
{
  AssertHeapIsIdle(cx);
  CHECK_REQUEST(cx);
  if (idp) {
      jsid id = *idp;
      if (JSID_IS_STRING(id))
          JS::ExposeGCThingToActiveJS(JSID_TO_STRING(id), JSTRACE_STRING);
      else if (JSID_IS_OBJECT(id))
          JS::ExposeGCThingToActiveJS(JSID_TO_OBJECT(id), JSTRACE_OBJECT);
  }
  return cx->compartment()->wrapId(cx, idp);
}

/*
 * Identity remapping. Not for casual consumers.
 *
 * Normally, an object's contents and its identity are inextricably linked.
 * Identity is determined by the address of the JSObject* in the heap, and
 * the contents are what is located at that address. Transplanting allows these
 * concepts to be separated through a combination of swapping (exchanging the
 * contents of two same-compartment objects) and remapping cross-compartment
 * identities by altering wrappers.
 *
 * The |origobj| argument should be the object whose identity needs to be
 * remapped, usually to another compartment. The contents of |origobj| are
 * destroyed.
 *
 * The |target| argument serves two purposes:
 *
 * First, |target| serves as a hint for the new identity of the object. The new
 * identity object will always be in the same compartment as |target|, but
 * if that compartment already had an object representing |origobj| (either a
 * cross-compartment wrapper for it, or |origobj| itself if the two arguments
 * are same-compartment), the existing object is used. Otherwise, |target|
 * itself is used. To avoid ambiguity, JS_TransplantObject always returns the
 * new identity.
 *
 * Second, the new identity object's contents will be those of |target|. A swap()
 * is used to make this happen if an object other than |target| is used.
 *
 * We don't have a good way to recover from failure in this function, so
 * we intentionally crash instead.
 */

JS_PUBLIC_API(JSObject *)
JS_TransplantObject(JSContext *cx, HandleObject origobj, HandleObject target)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    JS_ASSERT(origobj != target);
    JS_ASSERT(!IsCrossCompartmentWrapper(origobj));
    JS_ASSERT(!IsCrossCompartmentWrapper(target));

    AutoMaybeTouchDeadZones agc(cx);
    AutoDisableProxyCheck adpc(cx->runtime());

    JSCompartment *destination = target->compartment();
    RootedValue origv(cx, ObjectValue(*origobj));
    RootedObject newIdentity(cx);

    if (origobj->compartment() == destination) {
        // If the original object is in the same compartment as the
        // destination, then we know that we won't find a wrapper in the
        // destination's cross compartment map and that the same
        // object will continue to work.
        if (!JSObject::swap(cx, origobj, target))
            MOZ_CRASH();
        newIdentity = origobj;
    } else if (WrapperMap::Ptr p = destination->lookupWrapper(origv)) {
        // There might already be a wrapper for the original object in
        // the new compartment. If there is, we use its identity and swap
        // in the contents of |target|.
        newIdentity = &p->value.toObject();

        // When we remove origv from the wrapper map, its wrapper, newIdentity,
        // must immediately cease to be a cross-compartment wrapper. Neuter it.
        destination->removeWrapper(p);
        NukeCrossCompartmentWrapper(cx, newIdentity);

        if (!JSObject::swap(cx, newIdentity, target))
            MOZ_CRASH();
    } else {
        // Otherwise, we use |target| for the new identity object.
        newIdentity = target;
    }

    // Now, iterate through other scopes looking for references to the
    // old object, and update the relevant cross-compartment wrappers.
    if (!RemapAllWrappersForObject(cx, origobj, newIdentity))
        MOZ_CRASH();

    // Lastly, update the original object to point to the new one.
    if (origobj->compartment() != destination) {
        RootedObject newIdentityWrapper(cx, newIdentity);
        AutoCompartment ac(cx, origobj);
        if (!JS_WrapObject(cx, newIdentityWrapper.address()))
            MOZ_CRASH();
        JS_ASSERT(Wrapper::wrappedObject(newIdentityWrapper) == newIdentity);
        if (!JSObject::swap(cx, origobj, newIdentityWrapper))
            MOZ_CRASH();
        origobj->compartment()->putWrapper(ObjectValue(*newIdentity), origv);
    }

    // The new identity object might be one of several things. Return it to avoid
    // ambiguity.
    return newIdentity;
}

/*
 * Recompute all cross-compartment wrappers for an object, resetting state.
 * Gecko uses this to clear Xray wrappers when doing a navigation that reuses
 * the inner window and global object.
 */
JS_PUBLIC_API(JSBool)
JS_RefreshCrossCompartmentWrappers(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    return RemapAllWrappersForObject(cx, obj, obj);
}

JS_PUBLIC_API(void)
JS_SetGlobalObject(JSContext *cx, JSObject *obj)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    cx->setDefaultCompartmentObject(obj);
}

JS_PUBLIC_API(JSBool)
JS_InitStandardClasses(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    cx->setDefaultCompartmentObjectIfUnset(obj);
    assertSameCompartment(cx, obj);

    Rooted<GlobalObject*> global(cx, &obj->global());
    return GlobalObject::initStandardClasses(cx, global);
}

#define CLASP(name)                 (&name##Class)
#define OCLASP(name)                (&name##Object::class_)
#define TYPED_ARRAY_CLASP(type)     (&TypedArray::classes[TypedArray::type])
#define EAGER_ATOM(name)            NAME_OFFSET(name)
#define EAGER_CLASS_ATOM(name)      NAME_OFFSET(name)
#define EAGER_ATOM_AND_CLASP(name)  EAGER_CLASS_ATOM(name), CLASP(name)
#define EAGER_ATOM_AND_OCLASP(name) EAGER_CLASS_ATOM(name), OCLASP(name)

typedef struct JSStdName {
    JSClassInitializerOp init;
    size_t      atomOffset;     /* offset of atom pointer in JSAtomState */
    Class       *clasp;
} JSStdName;

static Handle<PropertyName*>
StdNameToPropertyName(JSContext *cx, const JSStdName *stdn)
{
    return OFFSET_TO_NAME(cx->runtime(), stdn->atomOffset);
}

/*
 * Table of class initializers and their atom offsets in rt->atomState.
 * If you add a "standard" class, remember to update this table.
 */
static const JSStdName standard_class_atoms[] = {
    {js_InitFunctionClass,              EAGER_CLASS_ATOM(Function), &JSFunction::class_},
    {js_InitObjectClass,                EAGER_ATOM_AND_CLASP(Object)},
    {js_InitArrayClass,                 EAGER_ATOM_AND_CLASP(Array)},
    {js_InitBooleanClass,               EAGER_ATOM_AND_OCLASP(Boolean)},
    {js_InitDateClass,                  EAGER_ATOM_AND_CLASP(Date)},
    {js_InitMathClass,                  EAGER_ATOM_AND_CLASP(Math)},
    {js_InitNumberClass,                EAGER_ATOM_AND_OCLASP(Number)},
    {js_InitStringClass,                EAGER_ATOM_AND_OCLASP(String)},
    {js_InitExceptionClasses,           EAGER_ATOM_AND_CLASP(Error)},
    {js_InitRegExpClass,                EAGER_ATOM_AND_OCLASP(RegExp)},
#if JS_HAS_GENERATORS
    {js_InitIteratorClasses,            EAGER_ATOM_AND_OCLASP(StopIteration)},
#endif
    {js_InitJSONClass,                  EAGER_ATOM_AND_CLASP(JSON)},
    {js_InitTypedArrayClasses,          EAGER_CLASS_ATOM(ArrayBuffer), &js::ArrayBufferObject::protoClass},
    {js_InitWeakMapClass,               EAGER_ATOM_AND_OCLASP(WeakMap)},
    {js_InitMapClass,                   EAGER_ATOM_AND_OCLASP(Map)},
    {js_InitSetClass,                   EAGER_ATOM_AND_OCLASP(Set)},
#ifdef ENABLE_PARALLEL_JS
    {js_InitParallelArrayClass,         EAGER_ATOM_AND_OCLASP(ParallelArray)},
#endif
    {js_InitProxyClass,                 EAGER_ATOM_AND_CLASP(Proxy)},
#if ENABLE_INTL_API
    {js_InitIntlClass,                  EAGER_ATOM_AND_CLASP(Intl)},
#endif
    {NULL,                              0, NULL}
};

/*
 * Table of top-level function and constant names and their init functions.
 * If you add a "standard" global function or property, remember to update
 * this table.
 */
static const JSStdName standard_class_names[] = {
    {js_InitObjectClass,        EAGER_ATOM(eval), CLASP(Object)},

    /* Global properties and functions defined by the Number class. */
    {js_InitNumberClass,        EAGER_ATOM(NaN), OCLASP(Number)},
    {js_InitNumberClass,        EAGER_ATOM(Infinity), OCLASP(Number)},
    {js_InitNumberClass,        EAGER_ATOM(isNaN), OCLASP(Number)},
    {js_InitNumberClass,        EAGER_ATOM(isFinite), OCLASP(Number)},
    {js_InitNumberClass,        EAGER_ATOM(parseFloat), OCLASP(Number)},
    {js_InitNumberClass,        EAGER_ATOM(parseInt), OCLASP(Number)},

    /* String global functions. */
    {js_InitStringClass,        EAGER_ATOM(escape), OCLASP(String)},
    {js_InitStringClass,        EAGER_ATOM(unescape), OCLASP(String)},
    {js_InitStringClass,        EAGER_ATOM(decodeURI), OCLASP(String)},
    {js_InitStringClass,        EAGER_ATOM(encodeURI), OCLASP(String)},
    {js_InitStringClass,        EAGER_ATOM(decodeURIComponent), OCLASP(String)},
    {js_InitStringClass,        EAGER_ATOM(encodeURIComponent), OCLASP(String)},
#if JS_HAS_UNEVAL
    {js_InitStringClass,        EAGER_ATOM(uneval), OCLASP(String)},
#endif

    /* Exception constructors. */
    {js_InitExceptionClasses,   EAGER_CLASS_ATOM(Error), CLASP(Error)},
    {js_InitExceptionClasses,   EAGER_CLASS_ATOM(InternalError), CLASP(Error)},
    {js_InitExceptionClasses,   EAGER_CLASS_ATOM(EvalError), CLASP(Error)},
    {js_InitExceptionClasses,   EAGER_CLASS_ATOM(RangeError), CLASP(Error)},
    {js_InitExceptionClasses,   EAGER_CLASS_ATOM(ReferenceError), CLASP(Error)},
    {js_InitExceptionClasses,   EAGER_CLASS_ATOM(SyntaxError), CLASP(Error)},
    {js_InitExceptionClasses,   EAGER_CLASS_ATOM(TypeError), CLASP(Error)},
    {js_InitExceptionClasses,   EAGER_CLASS_ATOM(URIError), CLASP(Error)},

    {js_InitIteratorClasses,    EAGER_CLASS_ATOM(Iterator), &PropertyIteratorObject::class_},

    /* Typed Arrays */
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(ArrayBuffer),  &ArrayBufferObject::class_},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(Int8Array),    TYPED_ARRAY_CLASP(TYPE_INT8)},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(Uint8Array),   TYPED_ARRAY_CLASP(TYPE_UINT8)},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(Int16Array),   TYPED_ARRAY_CLASP(TYPE_INT16)},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(Uint16Array),  TYPED_ARRAY_CLASP(TYPE_UINT16)},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(Int32Array),   TYPED_ARRAY_CLASP(TYPE_INT32)},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(Uint32Array),  TYPED_ARRAY_CLASP(TYPE_UINT32)},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(Float32Array), TYPED_ARRAY_CLASP(TYPE_FLOAT32)},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(Float64Array), TYPED_ARRAY_CLASP(TYPE_FLOAT64)},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(Uint8ClampedArray),
                                TYPED_ARRAY_CLASP(TYPE_UINT8_CLAMPED)},
    {js_InitTypedArrayClasses,  EAGER_CLASS_ATOM(DataView),     &DataViewObject::class_},

    {NULL,                      0, NULL}
};

static const JSStdName object_prototype_names[] = {
    /* Object.prototype properties (global delegates to Object.prototype). */
    {js_InitObjectClass,        EAGER_ATOM(proto), CLASP(Object)},
#if JS_HAS_TOSOURCE
    {js_InitObjectClass,        EAGER_ATOM(toSource), CLASP(Object)},
#endif
    {js_InitObjectClass,        EAGER_ATOM(toString), CLASP(Object)},
    {js_InitObjectClass,        EAGER_ATOM(toLocaleString), CLASP(Object)},
    {js_InitObjectClass,        EAGER_ATOM(valueOf), CLASP(Object)},
#if JS_HAS_OBJ_WATCHPOINT
    {js_InitObjectClass,        EAGER_ATOM(watch), CLASP(Object)},
    {js_InitObjectClass,        EAGER_ATOM(unwatch), CLASP(Object)},
#endif
    {js_InitObjectClass,        EAGER_ATOM(hasOwnProperty), CLASP(Object)},
    {js_InitObjectClass,        EAGER_ATOM(isPrototypeOf), CLASP(Object)},
    {js_InitObjectClass,        EAGER_ATOM(propertyIsEnumerable), CLASP(Object)},
#if OLD_GETTER_SETTER_METHODS
    {js_InitObjectClass,        EAGER_ATOM(defineGetter), CLASP(Object)},
    {js_InitObjectClass,        EAGER_ATOM(defineSetter), CLASP(Object)},
    {js_InitObjectClass,        EAGER_ATOM(lookupGetter), CLASP(Object)},
    {js_InitObjectClass,        EAGER_ATOM(lookupSetter), CLASP(Object)},
#endif

    {NULL,                      0, NULL}
};

#undef CLASP
#undef TYPED_ARRAY_CLASP
#undef EAGER_ATOM
#undef EAGER_CLASS_ATOM
#undef EAGER_ATOM_AND_CLASP

JS_PUBLIC_API(JSBool)
JS_ResolveStandardClass(JSContext *cx, HandleObject obj, HandleId id, JSBool *resolved)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JSRuntime *rt;
    JSAtom *atom;
    const JSStdName *stdnm;
    unsigned i;

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);
    *resolved = false;

    rt = cx->runtime();
    if (!rt->hasContexts() || !JSID_IS_ATOM(id))
        return true;

    RootedString idstr(cx, JSID_TO_STRING(id));

    /* Check whether we're resolving 'undefined', and define it if so. */
    atom = rt->atomState.undefined;
    if (idstr == atom) {
        *resolved = true;
        RootedValue undefinedValue(cx, UndefinedValue());
        return JSObject::defineProperty(cx, obj, atom->asPropertyName(), undefinedValue,
                                        JS_PropertyStub, JS_StrictPropertyStub,
                                        JSPROP_PERMANENT | JSPROP_READONLY);
    }

    /* Try for class constructors/prototypes named by well-known atoms. */
    stdnm = NULL;
    for (i = 0; standard_class_atoms[i].init; i++) {
        JS_ASSERT(standard_class_atoms[i].clasp);
        atom = OFFSET_TO_NAME(rt, standard_class_atoms[i].atomOffset);
        if (idstr == atom) {
            stdnm = &standard_class_atoms[i];
            break;
        }
    }

    if (!stdnm) {
        /* Try less frequently used top-level functions and constants. */
        for (i = 0; standard_class_names[i].init; i++) {
            JS_ASSERT(standard_class_names[i].clasp);
            atom = StdNameToPropertyName(cx, &standard_class_names[i]);
            if (!atom)
                return false;
            if (idstr == atom) {
                stdnm = &standard_class_names[i];
                break;
            }
        }

        RootedObject proto(cx);
        if (!JSObject::getProto(cx, obj, &proto))
            return false;
        if (!stdnm && !proto) {
            /*
             * Try even less frequently used names delegated from the global
             * object to Object.prototype, but only if the Object class hasn't
             * yet been initialized.
             */
            for (i = 0; object_prototype_names[i].init; i++) {
                JS_ASSERT(object_prototype_names[i].clasp);
                atom = StdNameToPropertyName(cx, &object_prototype_names[i]);
                if (!atom)
                    return false;
                if (idstr == atom) {
                    stdnm = &object_prototype_names[i];
                    break;
                }
            }
        }
    }

    if (stdnm) {
        /*
         * If this standard class is anonymous, then we don't want to resolve
         * by name.
         */
        JS_ASSERT(obj->is<GlobalObject>());
        if (stdnm->clasp->flags & JSCLASS_IS_ANONYMOUS)
            return true;

        if (IsStandardClassResolved(obj, stdnm->clasp))
            return true;

        if (!stdnm->init(cx, obj))
            return false;
        *resolved = true;
    }
    return true;
}

JS_PUBLIC_API(JSBool)
JS_EnumerateStandardClasses(JSContext *cx, HandleObject obj)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    /*
     * Check whether we need to bind 'undefined' and define it if so.
     * Since ES5 15.1.1.3 undefined can't be deleted.
     */
    HandlePropertyName undefinedName = cx->names().undefined;
    RootedValue undefinedValue(cx, UndefinedValue());
    if (!obj->nativeContains(cx, undefinedName) &&
        !JSObject::defineProperty(cx, obj, undefinedName, undefinedValue,
                                  JS_PropertyStub, JS_StrictPropertyStub,
                                  JSPROP_PERMANENT | JSPROP_READONLY)) {
        return false;
    }

    /* Initialize any classes that have not been initialized yet. */
    for (unsigned i = 0; standard_class_atoms[i].init; i++) {
        const JSStdName &stdnm = standard_class_atoms[i];
        if (!js::IsStandardClassResolved(obj, stdnm.clasp)) {
            if (!stdnm.init(cx, obj))
                return false;
        }
    }

    return true;
}

JS_PUBLIC_API(JSBool)
JS_GetClassObject(JSContext *cx, JSObject *obj, JSProtoKey key, JSObject **objpArg)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject objp(cx, *objpArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    assertSameCompartment(cx, obj);
    if (!js_GetClassObject(cx, obj, key, &objp))
        return false;
    *objpArg = objp;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_GetClassPrototype(JSContext *cx, JSProtoKey key, JSObject **objp_)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RootedObject objp(cx);
    bool result = js_GetClassPrototype(cx, key, &objp);
    *objp_ = objp;
    return result;
}

JS_PUBLIC_API(JSProtoKey)
JS_IdentifyClassPrototype(JSContext *cx, JSObject *obj)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JS_ASSERT(!IsCrossCompartmentWrapper(obj));
    return js_IdentifyClassPrototype(obj);
}

JS_PUBLIC_API(JSObject *)
JS_GetObjectPrototype(JSContext *cx, JSObject *forObj)
{
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, forObj);
    return forObj->global().getOrCreateObjectPrototype(cx);
}

JS_PUBLIC_API(JSObject *)
JS_GetFunctionPrototype(JSContext *cx, JSObject *forObj)
{
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, forObj);
    return forObj->global().getOrCreateFunctionPrototype(cx);
}

JS_PUBLIC_API(JSObject *)
JS_GetArrayPrototype(JSContext *cx, JSObject *forObj)
{
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, forObj);
    return forObj->global().getOrCreateArrayPrototype(cx);
}

JS_PUBLIC_API(JSObject *)
JS_GetGlobalForObject(JSContext *cx, JSObject *obj)
{
    AssertHeapIsIdle(cx);
    assertSameCompartment(cx, obj);
    return &obj->global();
}

extern JS_PUBLIC_API(JSBool)
JS_IsGlobalObject(JSObject *obj)
{
    return obj->is<GlobalObject>();
}

JS_PUBLIC_API(JSObject *)
JS_GetGlobalForCompartmentOrNull(JSContext *cx, JSCompartment *c)
{
    AssertHeapIsIdleOrIterating(cx);
    assertSameCompartment(cx, c);
    return c->maybeGlobal();
}

JS_PUBLIC_API(JSObject *)
JS_GetGlobalForScopeChain(JSContext *cx)
{
    AssertHeapIsIdleOrIterating(cx);
    CHECK_REQUEST(cx);
    if (!cx->compartment())
        return NULL;
    return cx->global();
}

JS_PUBLIC_API(jsval)
JS_ComputeThis(JSContext *cx, jsval *vp)
{
    AssertHeapIsIdle(cx);
    assertSameCompartment(cx, JSValueArray(vp, 2));
    CallReceiver call = CallReceiverFromVp(vp);
    if (!BoxNonStrictThis(cx, call))
        return JSVAL_NULL;
    return call.thisv();
}

JS_PUBLIC_API(void *)
JS_malloc(JSContext *cx, size_t nbytes)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return cx->malloc_(nbytes);
}

JS_PUBLIC_API(void *)
JS_realloc(JSContext *cx, void *p, size_t nbytes)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return cx->realloc_(p, nbytes);
}

JS_PUBLIC_API(void)
JS_free(JSContext *cx, void *p)
{
    return js_free(p);
}

JS_PUBLIC_API(void)
JS_freeop(JSFreeOp *fop, void *p)
{
    return FreeOp::get(fop)->free_(p);
}

JS_PUBLIC_API(JSFreeOp *)
JS_GetDefaultFreeOp(JSRuntime *rt)
{
    return rt->defaultFreeOp();
}

JS_PUBLIC_API(void)
JS_updateMallocCounter(JSContext *cx, size_t nbytes)
{
    return cx->runtime()->updateMallocCounter(cx->zone(), nbytes);
}

JS_PUBLIC_API(char *)
JS_strdup(JSContext *cx, const char *s)
{
    AssertHeapIsIdle(cx);
    size_t n = strlen(s) + 1;
    void *p = cx->malloc_(n);
    if (!p)
        return NULL;
    return (char *)js_memcpy(p, s, n);
}

JS_PUBLIC_API(char *)
JS_strdup(JSRuntime *rt, const char *s)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(rt);
    size_t n = strlen(s) + 1;
    void *p = rt->malloc_(n);
    if (!p)
        return NULL;
    return static_cast<char*>(js_memcpy(p, s, n));
}

#undef JS_AddRoot

JS_PUBLIC_API(JSBool)
JS_AddValueRoot(JSContext *cx, jsval *vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return AddValueRoot(cx, vp, NULL);
}

JS_PUBLIC_API(JSBool)
JS_AddStringRoot(JSContext *cx, JSString **rp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return AddStringRoot(cx, rp, NULL);
}

JS_PUBLIC_API(JSBool)
JS_AddObjectRoot(JSContext *cx, JSObject **rp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return AddObjectRoot(cx, rp, NULL);
}

JS_PUBLIC_API(JSBool)
JS_AddNamedValueRoot(JSContext *cx, jsval *vp, const char *name)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return AddValueRoot(cx, vp, name);
}

JS_PUBLIC_API(JSBool)
JS_AddNamedValueRootRT(JSRuntime *rt, jsval *vp, const char *name)
{
    return AddValueRootRT(rt, vp, name);
}

JS_PUBLIC_API(JSBool)
JS_AddNamedStringRoot(JSContext *cx, JSString **rp, const char *name)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return AddStringRoot(cx, rp, name);
}

JS_PUBLIC_API(JSBool)
JS_AddNamedObjectRoot(JSContext *cx, JSObject **rp, const char *name)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return AddObjectRoot(cx, rp, name);
}

JS_PUBLIC_API(JSBool)
JS_AddNamedScriptRoot(JSContext *cx, JSScript **rp, const char *name)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return AddScriptRoot(cx, rp, name);
}

/* We allow unrooting from finalizers within the GC */

JS_PUBLIC_API(void)
JS_RemoveValueRoot(JSContext *cx, jsval *vp)
{
    CHECK_REQUEST(cx);
    js_RemoveRoot(cx->runtime(), (void *)vp);
}

JS_PUBLIC_API(void)
JS_RemoveStringRoot(JSContext *cx, JSString **rp)
{
    CHECK_REQUEST(cx);
    js_RemoveRoot(cx->runtime(), (void *)rp);
}

JS_PUBLIC_API(void)
JS_RemoveObjectRoot(JSContext *cx, JSObject **rp)
{
    CHECK_REQUEST(cx);
    js_RemoveRoot(cx->runtime(), (void *)rp);
}

JS_PUBLIC_API(void)
JS_RemoveScriptRoot(JSContext *cx, JSScript **rp)
{
    CHECK_REQUEST(cx);
    js_RemoveRoot(cx->runtime(), (void *)rp);
}

JS_PUBLIC_API(void)
JS_RemoveValueRootRT(JSRuntime *rt, jsval *vp)
{
    js_RemoveRoot(rt, (void *)vp);
}

JS_PUBLIC_API(void)
JS_RemoveStringRootRT(JSRuntime *rt, JSString **rp)
{
    js_RemoveRoot(rt, (void *)rp);
}

JS_PUBLIC_API(void)
JS_RemoveObjectRootRT(JSRuntime *rt, JSObject **rp)
{
    js_RemoveRoot(rt, (void *)rp);
}

JS_PUBLIC_API(void)
JS_RemoveScriptRootRT(JSRuntime *rt, JSScript **rp)
{
    js_RemoveRoot(rt, (void *)rp);
}

JS_NEVER_INLINE JS_PUBLIC_API(void)
JS_AnchorPtr(void *p)
{
}

JS_PUBLIC_API(JSBool)
JS_AddExtraGCRootsTracer(JSRuntime *rt, JSTraceDataOp traceOp, void *data)
{
    AssertHeapIsIdle(rt);
    return !!rt->gcBlackRootTracers.append(JSRuntime::ExtraTracer(traceOp, data));
}

JS_PUBLIC_API(void)
JS_RemoveExtraGCRootsTracer(JSRuntime *rt, JSTraceDataOp traceOp, void *data)
{
    AssertHeapIsIdle(rt);
    for (size_t i = 0; i < rt->gcBlackRootTracers.length(); i++) {
        JSRuntime::ExtraTracer *e = &rt->gcBlackRootTracers[i];
        if (e->op == traceOp && e->data == data) {
            rt->gcBlackRootTracers.erase(e);
            break;
        }
    }
}

JS_PUBLIC_API(void)
JS_CallValueTracer(JSTracer *trc, Value *valuep, const char *name)
{
    MarkValueUnbarriered(trc, valuep, name);
}

JS_PUBLIC_API(void)
JS_CallIdTracer(JSTracer *trc, jsid *idp, const char *name)
{
    MarkIdUnbarriered(trc, idp, name);
}

JS_PUBLIC_API(void)
JS_CallObjectTracer(JSTracer *trc, JSObject **objp, const char *name)
{
    MarkObjectUnbarriered(trc, objp, name);
}

JS_PUBLIC_API(void)
JS_CallMaskedObjectTracer(JSTracer *trc, uintptr_t *objp, uintptr_t flagMask, const char *name)
{
    uintptr_t flags = *objp & flagMask;
    JSObject *obj = reinterpret_cast<JSObject *>(*objp & ~flagMask);
    if (!obj)
        return;

    JS_SET_TRACING_LOCATION(trc, (void*)objp);
    MarkObjectUnbarriered(trc, &obj, name);

    *objp = uintptr_t(obj) | flags;
}

JS_PUBLIC_API(void)
JS_CallStringTracer(JSTracer *trc, JSString **strp, const char *name)
{
    MarkStringUnbarriered(trc, strp, name);
}

JS_PUBLIC_API(void)
JS_CallScriptTracer(JSTracer *trc, JSScript **scriptp, const char *name)
{
    MarkScriptUnbarriered(trc, scriptp, name);
}

JS_PUBLIC_API(void)
JS_CallGenericTracer(JSTracer *trc, void *gcthingArg, const char *name)
{
    void *gcthing = gcthingArg;
    JSGCTraceKind kind = gc::GetGCThingTraceKind(gcthing);
    JS_SET_TRACING_NAME(trc, name);
    MarkKind(trc, &gcthing, kind);
    JS_ASSERT(gcthing == gcthingArg);
}

JS_PUBLIC_API(void)
JS_CallHeapValueTracer(JSTracer *trc, JS::Heap<JS::Value> *valuep, const char *name)
{
    MarkValueUnbarriered(trc, valuep->unsafeGet(), name);
}

JS_PUBLIC_API(void)
JS_CallHeapIdTracer(JSTracer *trc, JS::Heap<jsid> *idp, const char *name)
{
    MarkIdUnbarriered(trc, idp->unsafeGet(), name);
}

JS_PUBLIC_API(void)
JS_CallHeapObjectTracer(JSTracer *trc, JS::Heap<JSObject *> *objp, const char *name)
{
    MarkObjectUnbarriered(trc, objp->unsafeGet(), name);
}

JS_PUBLIC_API(void)
JS_CallHeapStringTracer(JSTracer *trc, JS::Heap<JSString *> *strp, const char *name)
{
    MarkStringUnbarriered(trc, strp->unsafeGet(), name);
}

JS_PUBLIC_API(void)
JS_CallHeapScriptTracer(JSTracer *trc, JS::Heap<JSScript *> *scriptp, const char *name)
{
    MarkScriptUnbarriered(trc, scriptp->unsafeGet(), name);
}

JS_PUBLIC_API(void)
JS_TracerInit(JSTracer *trc, JSRuntime *rt, JSTraceCallback callback)
{
    InitTracer(trc, rt, callback);
}

JS_PUBLIC_API(void)
JS_TraceRuntime(JSTracer *trc)
{
    AssertHeapIsIdle(trc->runtime);
    TraceRuntime(trc);
}

JS_PUBLIC_API(void)
JS_TraceChildren(JSTracer *trc, void *thing, JSGCTraceKind kind)
{
    js::TraceChildren(trc, thing, kind);
}

JS_PUBLIC_API(void)
JS_GetTraceThingInfo(char *buf, size_t bufsize, JSTracer *trc, void *thing,
                     JSGCTraceKind kind, JSBool details)
{
    const char *name = NULL; /* silence uninitialized warning */
    size_t n;

    if (bufsize == 0)
        return;

    switch (kind) {
      case JSTRACE_OBJECT:
      {
        name = static_cast<JSObject *>(thing)->getClass()->name;
        break;
      }

      case JSTRACE_STRING:
        name = ((JSString *)thing)->isDependent()
               ? "substring"
               : "string";
        break;

      case JSTRACE_SCRIPT:
        name = "script";
        break;

      case JSTRACE_LAZY_SCRIPT:
        name = "lazyscript";
        break;

      case JSTRACE_IONCODE:
        name = "ioncode";
        break;

      case JSTRACE_SHAPE:
        name = "shape";
        break;

      case JSTRACE_BASE_SHAPE:
        name = "base_shape";
        break;

      case JSTRACE_TYPE_OBJECT:
        name = "type_object";
        break;
    }

    n = strlen(name);
    if (n > bufsize - 1)
        n = bufsize - 1;
    js_memcpy(buf, name, n + 1);
    buf += n;
    bufsize -= n;
    *buf = '\0';

    if (details && bufsize > 2) {
        switch (kind) {
          case JSTRACE_OBJECT:
          {
            JSObject *obj = (JSObject *)thing;
            if (obj->is<JSFunction>()) {
                JSFunction *fun = &obj->as<JSFunction>();
                if (fun->displayAtom()) {
                    *buf++ = ' ';
                    bufsize--;
                    PutEscapedString(buf, bufsize, fun->displayAtom(), 0);
                }
            } else if (obj->getClass()->flags & JSCLASS_HAS_PRIVATE) {
                JS_snprintf(buf, bufsize, " %p", obj->getPrivate());
            } else {
                JS_snprintf(buf, bufsize, " <no private>");
            }
            break;
          }

          case JSTRACE_STRING:
          {
            *buf++ = ' ';
            bufsize--;
            JSString *str = (JSString *)thing;
            if (str->isLinear())
                PutEscapedString(buf, bufsize, &str->asLinear(), 0);
            else
                JS_snprintf(buf, bufsize, "<rope: length %d>", (int)str->length());
            break;
          }

          case JSTRACE_SCRIPT:
          {
            JSScript *script = static_cast<JSScript *>(thing);
            JS_snprintf(buf, bufsize, " %s:%u", script->filename(), unsigned(script->lineno));
            break;
          }

          case JSTRACE_LAZY_SCRIPT:
          case JSTRACE_IONCODE:
          case JSTRACE_SHAPE:
          case JSTRACE_BASE_SHAPE:
          case JSTRACE_TYPE_OBJECT:
            break;
        }
    }
    buf[bufsize - 1] = '\0';
}

extern JS_PUBLIC_API(const char *)
JS_GetTraceEdgeName(JSTracer *trc, char *buffer, int bufferSize)
{
    if (trc->debugPrinter) {
        trc->debugPrinter(trc, buffer, bufferSize);
        return buffer;
    }
    if (trc->debugPrintIndex != (size_t) - 1) {
        JS_snprintf(buffer, bufferSize, "%s[%lu]",
                    (const char *)trc->debugPrintArg,
                    trc->debugPrintIndex);
        return buffer;
    }
    return (const char*)trc->debugPrintArg;
}

#ifdef DEBUG

typedef struct JSHeapDumpNode JSHeapDumpNode;

struct JSHeapDumpNode {
    void            *thing;
    JSGCTraceKind   kind;
    JSHeapDumpNode  *next;          /* next sibling */
    JSHeapDumpNode  *parent;        /* node with the thing that refer to thing
                                       from this node */
    char            edgeName[1];    /* name of the edge from parent->thing
                                       into thing */
};

typedef HashSet<void *, PointerHasher<void *, 3>, SystemAllocPolicy> VisitedSet;

typedef struct JSDumpingTracer {
    JSTracer            base;
    VisitedSet          visited;
    bool                ok;
    void                *startThing;
    void                *thingToFind;
    void                *thingToIgnore;
    JSHeapDumpNode      *parentNode;
    JSHeapDumpNode      **lastNodep;
    char                buffer[200];
} JSDumpingTracer;

static void
DumpNotify(JSTracer *trc, void **thingp, JSGCTraceKind kind)
{
    JS_ASSERT(trc->callback == DumpNotify);

    JSDumpingTracer *dtrc = (JSDumpingTracer *)trc;
    void *thing = *thingp;

    if (!dtrc->ok || thing == dtrc->thingToIgnore)
        return;

    /*
     * Check if we have already seen thing unless it is thingToFind to include
     * it to the graph each time we reach it and print all live things that
     * refer to thingToFind.
     *
     * This does not print all possible paths leading to thingToFind since
     * when a thing A refers directly or indirectly to thingToFind and A is
     * present several times in the graph, we will print only the first path
     * leading to A and thingToFind, other ways to reach A will be ignored.
     */
    if (dtrc->thingToFind != thing) {
        /*
         * The startThing check allows to avoid putting startThing into the
         * hash table before tracing startThing in JS_DumpHeap.
         */
        if (thing == dtrc->startThing)
            return;
        VisitedSet::AddPtr p = dtrc->visited.lookupForAdd(thing);
        if (p)
            return;
        if (!dtrc->visited.add(p, thing)) {
            dtrc->ok = false;
            return;
        }
    }

    const char *edgeName = JS_GetTraceEdgeName(&dtrc->base, dtrc->buffer, sizeof(dtrc->buffer));
    size_t edgeNameSize = strlen(edgeName) + 1;
    size_t bytes = offsetof(JSHeapDumpNode, edgeName) + edgeNameSize;
    JSHeapDumpNode *node = (JSHeapDumpNode *) js_malloc(bytes);
    if (!node) {
        dtrc->ok = false;
        return;
    }

    node->thing = thing;
    node->kind = kind;
    node->next = NULL;
    node->parent = dtrc->parentNode;
    js_memcpy(node->edgeName, edgeName, edgeNameSize);

    JS_ASSERT(!*dtrc->lastNodep);
    *dtrc->lastNodep = node;
    dtrc->lastNodep = &node->next;
}

/* Dump node and the chain that leads to thing it contains. */
static JSBool
DumpNode(JSDumpingTracer *dtrc, FILE* fp, JSHeapDumpNode *node)
{
    JSHeapDumpNode *prev, *following;
    size_t chainLimit;
    enum { MAX_PARENTS_TO_PRINT = 10 };

    JS_GetTraceThingInfo(dtrc->buffer, sizeof dtrc->buffer,
                         &dtrc->base, node->thing, node->kind, JS_TRUE);
    if (fprintf(fp, "%p %-22s via ", node->thing, dtrc->buffer) < 0)
        return JS_FALSE;

    /*
     * We need to print the parent chain in the reverse order. To do it in
     * O(N) time where N is the chain length we first reverse the chain while
     * searching for the top and then print each node while restoring the
     * chain order.
     */
    chainLimit = MAX_PARENTS_TO_PRINT;
    prev = NULL;
    for (;;) {
        following = node->parent;
        node->parent = prev;
        prev = node;
        node = following;
        if (!node)
            break;
        if (chainLimit == 0) {
            if (fputs("...", fp) < 0)
                return JS_FALSE;
            break;
        }
        --chainLimit;
    }

    node = prev;
    prev = following;
    bool ok = true;
    do {
        /* Loop must continue even when !ok to restore the parent chain. */
        if (ok) {
            if (!prev) {
                /* Print edge from some runtime root or startThing. */
                if (fputs(node->edgeName, fp) < 0)
                    ok = false;
            } else {
                JS_GetTraceThingInfo(dtrc->buffer, sizeof dtrc->buffer,
                                     &dtrc->base, prev->thing, prev->kind,
                                     JS_FALSE);
                if (fprintf(fp, "(%p %s).%s",
                           prev->thing, dtrc->buffer, node->edgeName) < 0) {
                    ok = false;
                }
            }
        }
        following = node->parent;
        node->parent = prev;
        prev = node;
        node = following;
    } while (node);

    return ok && putc('\n', fp) >= 0;
}

JS_PUBLIC_API(JSBool)
JS_DumpHeap(JSRuntime *rt, FILE *fp, void* startThing, JSGCTraceKind startKind,
            void *thingToFind, size_t maxDepth, void *thingToIgnore)
{
    if (maxDepth == 0)
        return true;

    JSDumpingTracer dtrc;
    if (!dtrc.visited.init())
        return false;
    JS_TracerInit(&dtrc.base, rt, DumpNotify);
    dtrc.ok = true;
    dtrc.startThing = startThing;
    dtrc.thingToFind = thingToFind;
    dtrc.thingToIgnore = thingToIgnore;
    dtrc.parentNode = NULL;
    JSHeapDumpNode *node = NULL;
    dtrc.lastNodep = &node;
    if (!startThing) {
        JS_ASSERT(startKind == JSTRACE_OBJECT);
        TraceRuntime(&dtrc.base);
    } else {
        JS_TraceChildren(&dtrc.base, startThing, startKind);
    }

    if (!node)
        return dtrc.ok;

    size_t depth = 1;
    JSHeapDumpNode *children, *next, *parent;
    bool thingToFindWasTraced = thingToFind && thingToFind == startThing;
    for (;;) {
        /*
         * Loop must continue even when !dtrc.ok to free all nodes allocated
         * so far.
         */
        if (dtrc.ok) {
            if (thingToFind == NULL || thingToFind == node->thing)
                dtrc.ok = DumpNode(&dtrc, fp, node);

            /* Descend into children. */
            if (dtrc.ok &&
                depth < maxDepth &&
                (thingToFind != node->thing || !thingToFindWasTraced)) {
                dtrc.parentNode = node;
                children = NULL;
                dtrc.lastNodep = &children;
                JS_TraceChildren(&dtrc.base, node->thing, node->kind);
                if (thingToFind == node->thing)
                    thingToFindWasTraced = JS_TRUE;
                if (children != NULL) {
                    ++depth;
                    node = children;
                    continue;
                }
            }
        }

        /* Move to next or parents next and free the node. */
        for (;;) {
            next = node->next;
            parent = node->parent;
            js_free(node);
            node = next;
            if (node)
                break;
            if (!parent)
                return dtrc.ok;
            JS_ASSERT(depth > 1);
            --depth;
            node = parent;
        }
    }

    JS_ASSERT(depth == 1);
    return dtrc.ok;
}

#endif /* DEBUG */

extern JS_PUBLIC_API(JSBool)
JS_IsGCMarkingTracer(JSTracer *trc)
{
    return IS_GC_MARKING_TRACER(trc);
}

JS_PUBLIC_API(void)
JS_GC(JSRuntime *rt)
{
    AssertHeapIsIdle(rt);
    JS::PrepareForFullGC(rt);
    GC(rt, GC_NORMAL, JS::gcreason::API);
}

JS_PUBLIC_API(void)
JS_MaybeGC(JSContext *cx)
{
    MaybeGC(cx);
}

JS_PUBLIC_API(void)
JS_SetGCCallback(JSRuntime *rt, JSGCCallback cb)
{
    AssertHeapIsIdle(rt);
    rt->gcCallback = cb;
}

JS_PUBLIC_API(void)
JS_SetFinalizeCallback(JSRuntime *rt, JSFinalizeCallback cb)
{
    AssertHeapIsIdle(rt);
    rt->gcFinalizeCallback = cb;
}

JS_PUBLIC_API(JSBool)
JS_IsAboutToBeFinalized(JSObject **obj)
{
    return IsObjectAboutToBeFinalized(obj);
}

JS_PUBLIC_API(void)
JS_SetGCParameter(JSRuntime *rt, JSGCParamKey key, uint32_t value)
{
    switch (key) {
      case JSGC_MAX_BYTES: {
        JS_ASSERT(value >= rt->gcBytes);
        rt->gcMaxBytes = value;
        break;
      }
      case JSGC_MAX_MALLOC_BYTES:
        rt->setGCMaxMallocBytes(value);
        break;
      case JSGC_SLICE_TIME_BUDGET:
        rt->gcSliceBudget = SliceBudget::TimeBudget(value);
        break;
      case JSGC_MARK_STACK_LIMIT:
        js::SetMarkStackLimit(rt, value);
        break;
      case JSGC_HIGH_FREQUENCY_TIME_LIMIT:
        rt->gcHighFrequencyTimeThreshold = value;
        break;
      case JSGC_HIGH_FREQUENCY_LOW_LIMIT:
        rt->gcHighFrequencyLowLimitBytes = value * 1024 * 1024;
        break;
      case JSGC_HIGH_FREQUENCY_HIGH_LIMIT:
        rt->gcHighFrequencyHighLimitBytes = value * 1024 * 1024;
        break;
      case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX:
        rt->gcHighFrequencyHeapGrowthMax = value / 100.0;
        break;
      case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN:
        rt->gcHighFrequencyHeapGrowthMin = value / 100.0;
        break;
      case JSGC_LOW_FREQUENCY_HEAP_GROWTH:
        rt->gcLowFrequencyHeapGrowth = value / 100.0;
        break;
      case JSGC_DYNAMIC_HEAP_GROWTH:
        rt->gcDynamicHeapGrowth = value;
        break;
      case JSGC_DYNAMIC_MARK_SLICE:
        rt->gcDynamicMarkSlice = value;
        break;
      case JSGC_ANALYSIS_PURGE_TRIGGER:
        rt->analysisPurgeTriggerBytes = value * 1024 * 1024;
        break;
      case JSGC_ALLOCATION_THRESHOLD:
        rt->gcAllocationThreshold = value * 1024 * 1024;
        break;
      case JSGC_DECOMMIT_THRESHOLD:
        rt->gcDecommitThreshold = value * 1024 * 1024;
        break;
      default:
        JS_ASSERT(key == JSGC_MODE);
        rt->gcMode = JSGCMode(value);
        JS_ASSERT(rt->gcMode == JSGC_MODE_GLOBAL ||
                  rt->gcMode == JSGC_MODE_COMPARTMENT ||
                  rt->gcMode == JSGC_MODE_INCREMENTAL);
        return;
    }
}

JS_PUBLIC_API(uint32_t)
JS_GetGCParameter(JSRuntime *rt, JSGCParamKey key)
{
    switch (key) {
      case JSGC_MAX_BYTES:
        return uint32_t(rt->gcMaxBytes);
      case JSGC_MAX_MALLOC_BYTES:
        return rt->gcMaxMallocBytes;
      case JSGC_BYTES:
        return uint32_t(rt->gcBytes);
      case JSGC_MODE:
        return uint32_t(rt->gcMode);
      case JSGC_UNUSED_CHUNKS:
        return uint32_t(rt->gcChunkPool.getEmptyCount());
      case JSGC_TOTAL_CHUNKS:
        return uint32_t(rt->gcChunkSet.count() + rt->gcChunkPool.getEmptyCount());
      case JSGC_SLICE_TIME_BUDGET:
        return uint32_t(rt->gcSliceBudget > 0 ? rt->gcSliceBudget / PRMJ_USEC_PER_MSEC : 0);
      case JSGC_MARK_STACK_LIMIT:
        return rt->gcMarker.sizeLimit();
      case JSGC_HIGH_FREQUENCY_TIME_LIMIT:
        return rt->gcHighFrequencyTimeThreshold;
      case JSGC_HIGH_FREQUENCY_LOW_LIMIT:
        return rt->gcHighFrequencyLowLimitBytes / 1024 / 1024;
      case JSGC_HIGH_FREQUENCY_HIGH_LIMIT:
        return rt->gcHighFrequencyHighLimitBytes / 1024 / 1024;
      case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX:
        return uint32_t(rt->gcHighFrequencyHeapGrowthMax * 100);
      case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN:
        return uint32_t(rt->gcHighFrequencyHeapGrowthMin * 100);
      case JSGC_LOW_FREQUENCY_HEAP_GROWTH:
        return uint32_t(rt->gcLowFrequencyHeapGrowth * 100);
      case JSGC_DYNAMIC_HEAP_GROWTH:
        return rt->gcDynamicHeapGrowth;
      case JSGC_DYNAMIC_MARK_SLICE:
        return rt->gcDynamicMarkSlice;
      case JSGC_ANALYSIS_PURGE_TRIGGER:
        return rt->analysisPurgeTriggerBytes / 1024 / 1024;
      case JSGC_ALLOCATION_THRESHOLD:
        return rt->gcAllocationThreshold / 1024 / 1024;
      default:
        JS_ASSERT(key == JSGC_NUMBER);
        return uint32_t(rt->gcNumber);
    }
}

JS_PUBLIC_API(void)
JS_SetGCParameterForThread(JSContext *cx, JSGCParamKey key, uint32_t value)
{
    JS_ASSERT(key == JSGC_MAX_CODE_CACHE_BYTES);
}

JS_PUBLIC_API(uint32_t)
JS_GetGCParameterForThread(JSContext *cx, JSGCParamKey key)
{
    JS_ASSERT(key == JSGC_MAX_CODE_CACHE_BYTES);
    return 0;
}

JS_PUBLIC_API(JSString *)
JS_NewExternalString(JSContext *cx, const jschar *chars, size_t length,
                     const JSStringFinalizer *fin)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JSString *s = JSExternalString::new_(cx, chars, length, fin);
    return s;
}

extern JS_PUBLIC_API(JSBool)
JS_IsExternalString(JSString *str)
{
    return str->isExternal();
}

extern JS_PUBLIC_API(const JSStringFinalizer *)
JS_GetExternalStringFinalizer(JSString *str)
{
    return str->asExternal().externalFinalizer();
}

JS_PUBLIC_API(void)
JS_SetNativeStackQuota(JSRuntime *rt, size_t stackSize)
{
    rt->nativeStackQuota = stackSize;
    if (!rt->nativeStackBase)
        return;

#if JS_STACK_GROWTH_DIRECTION > 0
    if (stackSize == 0) {
        rt->mainThread.nativeStackLimit = UINTPTR_MAX;
    } else {
        JS_ASSERT(rt->nativeStackBase <= size_t(-1) - stackSize);
        rt->mainThread.nativeStackLimit = rt->nativeStackBase + stackSize - 1;
    }
#else
    if (stackSize == 0) {
        rt->mainThread.nativeStackLimit = 0;
    } else {
        JS_ASSERT(rt->nativeStackBase >= stackSize);
        rt->mainThread.nativeStackLimit = rt->nativeStackBase - (stackSize - 1);
    }
#endif

    // If there's no pending interrupt request set on the runtime's main thread's
    // ionStackLimit, then update it so that it reflects the new nativeStacklimit.
#ifdef JS_ION
    {
        JSRuntime::AutoLockForOperationCallback lock(rt);
        if (rt->mainThread.ionStackLimit != uintptr_t(-1))
            rt->mainThread.ionStackLimit = rt->mainThread.nativeStackLimit;
    }
#endif
}

/************************************************************************/

JS_PUBLIC_API(int)
JS_IdArrayLength(JSContext *cx, JSIdArray *ida)
{
    return ida->length;
}

JS_PUBLIC_API(jsid)
JS_IdArrayGet(JSContext *cx, JSIdArray *ida, int index)
{
    JS_ASSERT(index >= 0 && index < ida->length);
    return ida->vector[index];
}

JS_PUBLIC_API(void)
JS_DestroyIdArray(JSContext *cx, JSIdArray *ida)
{
    DestroyIdArray(cx->runtime()->defaultFreeOp(), ida);
}

JS_PUBLIC_API(JSBool)
JS_ValueToId(JSContext *cx, jsval valueArg, jsid *idp)
{
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);

    RootedId id(cx);
    if (!ValueToId<CanGC>(cx, value, &id))
        return false;

    *idp = id;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_IdToValue(JSContext *cx, jsid id, jsval *vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    *vp = IdToJsval(id);
    assertSameCompartment(cx, *vp);
    return JS_TRUE;
}

JS_PUBLIC_API(JSBool)
JS_DefaultValue(JSContext *cx, JSObject *objArg, JSType hint, jsval *vp)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JS_ASSERT(obj != NULL);
    JS_ASSERT(hint == JSTYPE_VOID || hint == JSTYPE_STRING || hint == JSTYPE_NUMBER);

    RootedValue value(cx);
    if (!JSObject::defaultValue(cx, obj, hint, &value))
        return false;

    *vp = value;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_PropertyStub(JSContext *cx, HandleObject obj, HandleId id, MutableHandleValue vp)
{
    return JS_TRUE;
}

JS_PUBLIC_API(JSBool)
JS_StrictPropertyStub(JSContext *cx, HandleObject obj, HandleId id, JSBool strict, MutableHandleValue vp)
{
    return JS_TRUE;
}

JS_PUBLIC_API(JSBool)
JS_DeletePropertyStub(JSContext *cx, HandleObject obj, HandleId id, JSBool *succeeded)
{
    *succeeded = true;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_EnumerateStub(JSContext *cx, HandleObject obj)
{
    return JS_TRUE;
}

JS_PUBLIC_API(JSBool)
JS_ResolveStub(JSContext *cx, HandleObject obj, HandleId id)
{
    return JS_TRUE;
}

JS_PUBLIC_API(JSBool)
JS_ConvertStub(JSContext *cx, HandleObject obj, JSType type, MutableHandleValue vp)
{
    JS_ASSERT(type != JSTYPE_OBJECT && type != JSTYPE_FUNCTION);
    JS_ASSERT(obj);
    return DefaultValue(cx, obj, type, vp);
}

JS_PUBLIC_API(JSObject *)
JS_InitClass(JSContext *cx, JSObject *objArg, JSObject *parent_protoArg,
             JSClass *clasp, JSNative constructor, unsigned nargs,
             const JSPropertySpec *ps, const JSFunctionSpec *fs,
             const JSPropertySpec *static_ps, const JSFunctionSpec *static_fs)
{
    RootedObject obj(cx, objArg);
    RootedObject parent_proto(cx, parent_protoArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, parent_proto);
    return js_InitClass(cx, obj, parent_proto, Valueify(clasp), constructor,
                        nargs, ps, fs, static_ps, static_fs);
}

JS_PUBLIC_API(JSBool)
JS_LinkConstructorAndPrototype(JSContext *cx, JSObject *ctorArg, JSObject *protoArg)
{
    RootedObject ctor(cx, ctorArg);
    RootedObject proto(cx, protoArg);
    return LinkConstructorAndPrototype(cx, ctor, proto);
}

JS_PUBLIC_API(JSClass *)
JS_GetClass(JSObject *obj)
{
    return obj->getJSClass();
}

JS_PUBLIC_API(JSBool)
JS_InstanceOf(JSContext *cx, JSObject *objArg, JSClass *clasp, jsval *argv)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
#ifdef DEBUG
    if (argv) {
        assertSameCompartment(cx, obj);
        assertSameCompartment(cx, JSValueArray(argv - 2, 2));
    }
#endif
    if (!obj || obj->getJSClass() != clasp) {
        if (argv)
            ReportIncompatibleMethod(cx, CallReceiverFromArgv(argv), Valueify(clasp));
        return false;
    }
    return true;
}

JS_PUBLIC_API(JSBool)
JS_HasInstance(JSContext *cx, JSObject *objArg, jsval valueArg, JSBool *bp)
{
    RootedObject obj(cx, objArg);
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    assertSameCompartment(cx, obj, value);
    return HasInstance(cx, obj, value, bp);
}

JS_PUBLIC_API(void *)
JS_GetPrivate(JSObject *obj)
{
    /* This function can be called by a finalizer. */
    return obj->getPrivate();
}

JS_PUBLIC_API(void)
JS_SetPrivate(JSObject *obj, void *data)
{
    /* This function can be called by a finalizer. */
    obj->setPrivate(data);
}

JS_PUBLIC_API(void *)
JS_GetInstancePrivate(JSContext *cx, JSObject *objArg, JSClass *clasp, jsval *argv)
{
    RootedObject obj(cx, objArg);
    if (!JS_InstanceOf(cx, obj, clasp, argv))
        return NULL;
    return obj->getPrivate();
}

JS_PUBLIC_API(JSBool)
JS_GetPrototype(JSContext *cx, JSObject *objArg, JSObject **protop)
{
    RootedObject obj(cx, objArg);
    RootedObject proto(cx);
    bool rv = JSObject::getProto(cx, obj, &proto);
    *protop = proto;
    return rv;
}

JS_PUBLIC_API(JSBool)
JS_SetPrototype(JSContext *cx, JSObject *objArg, JSObject *protoArg)
{
    RootedObject obj(cx, objArg);
    RootedObject proto(cx, protoArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, proto);

    return SetClassAndProto(cx, obj, obj->getClass(), proto, JS_FALSE);
}

JS_PUBLIC_API(JSObject *)
JS_GetParent(JSObject *obj)
{
    JS_ASSERT(!obj->is<ScopeObject>());
    return obj->getParent();
}

JS_PUBLIC_API(JSBool)
JS_SetParent(JSContext *cx, JSObject *objArg, JSObject *parentArg)
{
    RootedObject obj(cx, objArg);
    RootedObject parent(cx, parentArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JS_ASSERT(!obj->is<ScopeObject>());
    JS_ASSERT(parent || !obj->getParent());
    assertSameCompartment(cx, obj, parent);

    return JSObject::setParent(cx, obj, parent);
}

JS_PUBLIC_API(JSObject *)
JS_GetConstructor(JSContext *cx, JSObject *protoArg)
{
    RootedObject proto(cx, protoArg);
    RootedValue cval(cx);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, proto);
    {
        JSAutoResolveFlags rf(cx, 0);

        if (!JSObject::getProperty(cx, proto, proto, cx->names().constructor, &cval))
            return NULL;
    }
    if (!IsFunctionObject(cval)) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_NO_CONSTRUCTOR,
                             proto->getClass()->name);
        return NULL;
    }
    return &cval.toObject();
}

JS_PUBLIC_API(JSBool)
JS_GetObjectId(JSContext *cx, JSObject *obj, jsid *idp)
{
    AssertHeapIsIdle(cx);
    assertSameCompartment(cx, obj);
    *idp = OBJECT_TO_JSID(obj);
    return JS_TRUE;
}

class AutoHoldZone
{
  public:
    explicit AutoHoldZone(Zone *zone
                          MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : holdp(&zone->hold)
    {
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
        *holdp = true;
    }

    ~AutoHoldZone() {
        *holdp = false;
    }

  private:
    bool *holdp;
    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

JS_PUBLIC_API(JSObject *)
JS_NewGlobalObject(JSContext *cx, JSClass *clasp, JSPrincipals *principals,
                   const JS::CompartmentOptions &options)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);

    JSRuntime *rt = cx->runtime();

    Zone *zone;
    if (options.zoneSpec == JS::SystemZone)
        zone = rt->systemZone;
    else if (options.zoneSpec == JS::FreshZone)
        zone = NULL;
    else
        zone = ((JSObject *)options.zoneSpec)->zone();

    JSCompartment *compartment = NewCompartment(cx, zone, principals, options);
    if (!compartment)
        return NULL;

    if (options.zoneSpec == JS::SystemZone) {
        rt->systemZone = compartment->zone();
        rt->systemZone->isSystem = true;
    }

    AutoHoldZone hold(compartment->zone());

    Rooted<GlobalObject *> global(cx);
    {
        AutoCompartment ac(cx, compartment);
        global = GlobalObject::create(cx, Valueify(clasp));
    }

    if (!global)
        return NULL;

    if (!Debugger::onNewGlobalObject(cx, global))
        return NULL;

    return global;
}

JS_PUBLIC_API(JSObject *)
JS_NewObject(JSContext *cx, JSClass *jsclasp, JSObject *protoArg, JSObject *parentArg)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject proto(cx, protoArg);
    RootedObject parent(cx, parentArg);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, proto, parent);

    Class *clasp = Valueify(jsclasp);
    if (!clasp)
        clasp = &ObjectClass;    /* default class is Object */

    JS_ASSERT(clasp != &JSFunction::class_);
    JS_ASSERT(!(clasp->flags & JSCLASS_IS_GLOBAL));

    JSObject *obj = NewObjectWithClassProto(cx, clasp, proto, parent);
    if (obj) {
        TypeObjectFlags flags = 0;
        if (clasp->emulatesUndefined())
            flags |= OBJECT_FLAG_EMULATES_UNDEFINED;
        if (flags)
            MarkTypeObjectFlags(cx, obj, flags);
    }

    JS_ASSERT_IF(obj, obj->getParent());
    return obj;
}

JS_PUBLIC_API(JSObject *)
JS_NewObjectWithGivenProto(JSContext *cx, JSClass *jsclasp, JSObject *protoArg, JSObject *parentArg)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject proto(cx, protoArg);
    RootedObject parent(cx, parentArg);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, proto, parent);

    Class *clasp = Valueify(jsclasp);
    if (!clasp)
        clasp = &ObjectClass;    /* default class is Object */

    JS_ASSERT(clasp != &JSFunction::class_);
    JS_ASSERT(!(clasp->flags & JSCLASS_IS_GLOBAL));

    JSObject *obj = NewObjectWithGivenProto(cx, clasp, proto, parent);
    if (obj)
        MarkTypeObjectUnknownProperties(cx, obj->type());
    return obj;
}

JS_PUBLIC_API(JSObject *)
JS_NewObjectForConstructor(JSContext *cx, JSClass *clasp, const jsval *vp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, *vp);

    RootedObject obj(cx, JSVAL_TO_OBJECT(*vp));
    return CreateThis(cx, Valueify(clasp), obj);
}

JS_PUBLIC_API(JSBool)
JS_IsExtensible(JSObject *obj)
{
    return obj->isExtensible();
}

JS_PUBLIC_API(JSBool)
JS_IsNative(JSObject *obj)
{
    return obj->isNative();
}

JS_PUBLIC_API(JSRuntime *)
JS_GetObjectRuntime(JSObject *obj)
{
    return obj->compartment()->rt;
}

JS_PUBLIC_API(JSBool)
JS_FreezeObject(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    return JSObject::freeze(cx, obj);
}

JS_PUBLIC_API(JSBool)
JS_DeepFreezeObject(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    /* Assume that non-extensible objects are already deep-frozen, to avoid divergence. */
    if (!obj->isExtensible())
        return true;

    if (!JSObject::freeze(cx, obj))
        return false;

    /* Walk slots in obj and if any value is a non-null object, seal it. */
    for (uint32_t i = 0, n = obj->slotSpan(); i < n; ++i) {
        const Value &v = obj->getSlot(i);
        if (v.isPrimitive())
            continue;
        RootedObject obj(cx, &v.toObject());
        if (!JS_DeepFreezeObject(cx, obj))
            return false;
    }

    return true;
}

static JSBool
LookupPropertyById(JSContext *cx, HandleObject obj, HandleId id, unsigned flags,
                   MutableHandleObject objp, MutableHandleShape propp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);

    JSAutoResolveFlags rf(cx, flags);
    return JSObject::lookupGeneric(cx, obj, id, objp, propp);
}

#define AUTO_NAMELEN(s,n)   (((n) == (size_t)-1) ? js_strlen(s) : (n))

static JSBool
LookupResult(JSContext *cx, HandleObject obj, HandleObject obj2, HandleId id,
             HandleShape shape, Value *vp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    if (!shape) {
        /* XXX bad API: no way to tell "not defined" from "void value" */
        vp->setUndefined();
        return JS_TRUE;
    }

    if (!obj2->isNative()) {
        if (obj2->isProxy()) {
            AutoPropertyDescriptorRooter desc(cx);
            if (!Proxy::getPropertyDescriptor(cx, obj2, id, &desc, 0))
                return false;
            if (!(desc.attrs & JSPROP_SHARED)) {
                *vp = desc.value;
                return true;
            }
        }
    } else if (IsImplicitDenseElement(shape)) {
        *vp = obj2->getDenseElement(JSID_TO_INT(id));
        return true;
    } else {
        /* Peek at the native property's slot value, without doing a Get. */
        if (shape->hasSlot()) {
            *vp = obj2->nativeGetSlot(shape->slot());
            return true;
        }
    }

    /* XXX bad API: no way to return "defined but value unknown" */
    vp->setBoolean(true);
    return true;
}

JS_PUBLIC_API(JSBool)
JS_LookupPropertyById(JSContext *cx, JSObject *objArg, jsid idArg, jsval *vp)
{
    RootedId id(cx, idArg);
    RootedObject obj(cx, objArg);
    RootedObject obj2(cx);
    RootedShape prop(cx);

    return LookupPropertyById(cx, obj, id, 0, &obj2, &prop) &&
           LookupResult(cx, obj, obj2, id, prop, vp);
}

JS_PUBLIC_API(JSBool)
JS_LookupElement(JSContext *cx, JSObject *objArg, uint32_t index, jsval *vp)
{
    RootedObject obj(cx, objArg);
    CHECK_REQUEST(cx);
    RootedId id(cx);
    if (!IndexToId(cx, index, &id))
        return false;
    return JS_LookupPropertyById(cx, obj, id, vp);
}

JS_PUBLIC_API(JSBool)
JS_LookupProperty(JSContext *cx, JSObject *objArg, const char *name, jsval *vp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    return atom && JS_LookupPropertyById(cx, obj, AtomToId(atom), vp);
}

JS_PUBLIC_API(JSBool)
JS_LookupUCProperty(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen, jsval *vp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    return atom && JS_LookupPropertyById(cx, obj, AtomToId(atom), vp);
}

JS_PUBLIC_API(JSBool)
JS_LookupPropertyWithFlagsById(JSContext *cx, JSObject *objArg, jsid id_, unsigned flags,
                               JSObject **objpArg, jsval *vp)
{
    RootedObject obj(cx, objArg);
    RootedObject objp(cx, *objpArg);
    RootedId id(cx, id_);
    RootedShape prop(cx);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);
    if (!(obj->isNative()
          ? LookupPropertyWithFlags(cx, obj, id, flags, &objp, &prop)
          : JSObject::lookupGeneric(cx, obj, id, &objp, &prop)))
        return false;

    if (!LookupResult(cx, obj, objp, id, prop, vp))
        return false;

    *objpArg = objp;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_LookupPropertyWithFlags(JSContext *cx, JSObject *objArg, const char *name, unsigned flags, jsval *vp)
{
    RootedObject obj(cx, objArg);
    JSObject *obj2;
    JSAtom *atom = Atomize(cx, name, strlen(name));
    return atom && JS_LookupPropertyWithFlagsById(cx, obj, AtomToId(atom), flags, &obj2, vp);
}

JS_PUBLIC_API(JSBool)
JS_HasPropertyById(JSContext *cx, JSObject *objArg, jsid idArg, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    RootedObject obj2(cx);
    RootedShape prop(cx);
    JSBool ok = LookupPropertyById(cx, obj, id, 0, &obj2, &prop);
    *foundp = (prop != NULL);
    return ok;
}

JS_PUBLIC_API(JSBool)
JS_HasElement(JSContext *cx, JSObject *objArg, uint32_t index, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    RootedId id(cx);
    if (!IndexToId(cx, index, &id))
        return false;
    return JS_HasPropertyById(cx, obj, id, foundp);
}

JS_PUBLIC_API(JSBool)
JS_HasProperty(JSContext *cx, JSObject *objArg, const char *name, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    return atom && JS_HasPropertyById(cx, obj, AtomToId(atom), foundp);
}

JS_PUBLIC_API(JSBool)
JS_HasUCProperty(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    return atom && JS_HasPropertyById(cx, obj, AtomToId(atom), foundp);
}

JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnPropertyById(JSContext *cx, JSObject *objArg, jsid id_, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, id_);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);

    if (!obj->isNative()) {
        RootedObject obj2(cx);
        RootedShape prop(cx);

        if (!LookupPropertyById(cx, obj, id, 0, &obj2, &prop))
            return JS_FALSE;
        *foundp = (obj == obj2);
        return JS_TRUE;
    }

    if (JSID_IS_INT(id) && obj->containsDenseElement(JSID_TO_INT(id))) {
        *foundp = true;
        return JS_TRUE;
    }

    *foundp = obj->nativeContains(cx, id);
    return JS_TRUE;
}

JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnElement(JSContext *cx, JSObject *objArg, uint32_t index, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    RootedId id(cx);
    if (!IndexToId(cx, index, &id))
        return false;
    return JS_AlreadyHasOwnPropertyById(cx, obj, id, foundp);
}

JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnProperty(JSContext *cx, JSObject *objArg, const char *name, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    return atom && JS_AlreadyHasOwnPropertyById(cx, obj, AtomToId(atom), foundp);
}

JS_PUBLIC_API(JSBool)
JS_AlreadyHasOwnUCProperty(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen,
                           JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    return atom && JS_AlreadyHasOwnPropertyById(cx, obj, AtomToId(atom), foundp);
}

/* Wrapper functions to create wrappers with no corresponding JSJitInfo from API
 * function arguments.
 */
static JSPropertyOpWrapper
GetterWrapper(JSPropertyOp getter)
{
    JSPropertyOpWrapper ret;
    ret.op = getter;
    ret.info = NULL;
    return ret;
}

static JSStrictPropertyOpWrapper
SetterWrapper(JSStrictPropertyOp setter)
{
    JSStrictPropertyOpWrapper ret;
    ret.op = setter;
    ret.info = NULL;
    return ret;
}

static JSBool
DefinePropertyById(JSContext *cx, HandleObject obj, HandleId id, HandleValue value,
                   const JSPropertyOpWrapper &get, const JSStrictPropertyOpWrapper &set,
                   unsigned attrs, unsigned flags, int tinyid)
{
    TRACK_MEMORY_SCOPE("Javascript");
    PropertyOp getter = get.op;
    StrictPropertyOp setter = set.op;
    /*
     * JSPROP_READONLY has no meaning when accessors are involved. Ideally we'd
     * throw if this happens, but we've accepted it for long enough that it's
     * not worth trying to make callers change their ways. Just flip it off on
     * its way through the API layer so that we can enforce this internally.
     */
    if (attrs & (JSPROP_GETTER | JSPROP_SETTER))
        attrs &= ~JSPROP_READONLY;

    /*
     * When we use DefineProperty, we need full scriptable Function objects rather
     * than JSNatives. However, we might be pulling this property descriptor off
     * of something with JSNative property descriptors. If we are, wrap them in
     * JS Function objects.
     */
    if (attrs & JSPROP_NATIVE_ACCESSORS) {
        JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
        JSFunction::Flags zeroFlags = JSAPIToJSFunctionFlags(0);
        // We can't just use JS_NewFunctionById here because it
        // assumes a string id.
        RootedAtom atom(cx, JSID_IS_ATOM(id) ? JSID_TO_ATOM(id) : nullptr);
        attrs &= ~JSPROP_NATIVE_ACCESSORS;
        if (getter) {
            RootedObject global(cx, (JSObject*) &obj->global());
            JSFunction *getobj = NewFunction(cx, NullPtr(), (Native) getter, 0,
                                             zeroFlags, global, atom);
            if (!getobj)
                return false;

            if (get.info)
                getobj->setJitInfo(get.info);

            getter = JS_DATA_TO_FUNC_PTR(PropertyOp, getobj);
            attrs |= JSPROP_GETTER;
        }
        if (setter) {
            // Root just the getter, since the setter is not yet a JSObject.
            AutoRooterGetterSetter getRoot(cx, JSPROP_GETTER, &getter, NULL);
            RootedObject global(cx, (JSObject*) &obj->global());
            JSFunction *setobj = NewFunction(cx, NullPtr(), (Native) setter, 1,
                                             zeroFlags, global, atom);
            if (!setobj)
                return false;

            if (set.info)
                setobj->setJitInfo(set.info);

            setter = JS_DATA_TO_FUNC_PTR(StrictPropertyOp, setobj);
            attrs |= JSPROP_SETTER;
        }
    }


    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id, value,
                            (attrs & JSPROP_GETTER)
                            ? JS_FUNC_TO_DATA_PTR(JSObject *, getter)
                            : NULL,
                            (attrs & JSPROP_SETTER)
                            ? JS_FUNC_TO_DATA_PTR(JSObject *, setter)
                            : NULL);

    JSAutoResolveFlags rf(cx, 0);
    if (flags != 0 && obj->isNative()) {
        return DefineNativeProperty(cx, obj, id, value, getter, setter,
                                    attrs, flags, tinyid);
    }
    return JSObject::defineGeneric(cx, obj, id, value, getter, setter, attrs);
}

JS_PUBLIC_API(JSBool)
JS_DefinePropertyById(JSContext *cx, JSObject *objArg, jsid idArg, jsval valueArg,
                      JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    RootedValue value(cx, valueArg);
    return DefinePropertyById(cx, obj, id, value, GetterWrapper(getter),
                              SetterWrapper(setter), attrs, 0, 0);
}

JS_PUBLIC_API(JSBool)
JS_DefineElement(JSContext *cx, JSObject *objArg, uint32_t index, jsval valueArg,
                 JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    RootedValue value(cx, valueArg);
    AutoRooterGetterSetter gsRoot(cx, attrs, &getter, &setter);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    RootedId id(cx);
    if (!IndexToId(cx, index, &id))
        return false;
    return DefinePropertyById(cx, obj, id, value, GetterWrapper(getter),
                              SetterWrapper(setter), attrs, 0, 0);
}

static JSBool
DefineProperty(JSContext *cx, HandleObject obj, const char *name, const Value &value_,
               const JSPropertyOpWrapper &getter, const JSStrictPropertyOpWrapper &setter,
               unsigned attrs, unsigned flags, int tinyid)
{
    RootedValue value(cx, value_);
    AutoRooterGetterSetter gsRoot(cx, attrs, const_cast<JSPropertyOp *>(&getter.op),
                                  const_cast<JSStrictPropertyOp *>(&setter.op));
    RootedId id(cx);

    if (attrs & JSPROP_INDEX) {
        id = INT_TO_JSID(intptr_t(name));
        attrs &= ~JSPROP_INDEX;
    } else {
        JSAtom *atom = Atomize(cx, name, strlen(name));
        if (!atom)
            return JS_FALSE;
        id = AtomToId(atom);
    }

    return DefinePropertyById(cx, obj, id, value, getter, setter, attrs, flags, tinyid);
}

JS_PUBLIC_API(JSBool)
JS_DefineProperty(JSContext *cx, JSObject *objArg, const char *name, jsval valueArg,
                  PropertyOp getter, JSStrictPropertyOp setter, unsigned attrs)
{
    RootedObject obj(cx, objArg);
    RootedValue value(cx, valueArg);
    return DefineProperty(cx, obj, name, value, GetterWrapper(getter),
                          SetterWrapper(setter), attrs, 0, 0);
}

JS_PUBLIC_API(JSBool)
JS_DefinePropertyWithTinyId(JSContext *cx, JSObject *objArg, const char *name, int8_t tinyid,
                            jsval valueArg, PropertyOp getter, JSStrictPropertyOp setter, unsigned attrs)
{
    RootedObject obj(cx, objArg);
    RootedValue value(cx, valueArg);
    return DefineProperty(cx, obj, name, value, GetterWrapper(getter),
                          SetterWrapper(setter), attrs, Shape::HAS_SHORTID, tinyid);
}

static JSBool
DefineUCProperty(JSContext *cx, HandleObject obj, const jschar *name, size_t namelen,
                 const Value &value_, PropertyOp getter, StrictPropertyOp setter, unsigned attrs,
                 unsigned flags, int tinyid)
{
    RootedValue value(cx, value_);
    AutoRooterGetterSetter gsRoot(cx, attrs, &getter, &setter);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return DefinePropertyById(cx, obj, id, value, GetterWrapper(getter),
                              SetterWrapper(setter), attrs, flags, tinyid);
}

JS_PUBLIC_API(JSBool)
JS_DefineUCProperty(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen,
                    jsval valueArg, JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs)
{
    RootedObject obj(cx, objArg);
    RootedValue value(cx, valueArg);
    return DefineUCProperty(cx, obj, name, namelen, value, getter, setter, attrs, 0, 0);
}

JS_PUBLIC_API(JSBool)
JS_DefineUCPropertyWithTinyId(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen,
                              int8_t tinyid, jsval valueArg,
                              JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs)
{
    RootedObject obj(cx, objArg);
    RootedValue value(cx, valueArg);
    return DefineUCProperty(cx, obj, name, namelen, value, getter, setter, attrs,
                            Shape::HAS_SHORTID, tinyid);
}

JS_PUBLIC_API(JSBool)
JS_DefineOwnProperty(JSContext *cx, JSObject *objArg, jsid idArg, jsval descriptorArg, JSBool *bp)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    RootedValue descriptor(cx, descriptorArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id, descriptor);

    return DefineOwnProperty(cx, obj, id, descriptor, bp);
}

JS_PUBLIC_API(JSObject *)
JS_DefineObject(JSContext *cx, JSObject *objArg, const char *name, JSClass *jsclasp,
                JSObject *protoArg, unsigned attrs)
{
    RootedObject obj(cx, objArg);
    RootedObject proto(cx, protoArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, proto);

    Class *clasp = Valueify(jsclasp);
    if (!clasp)
        clasp = &ObjectClass;    /* default class is Object */

    RootedObject nobj(cx, NewObjectWithClassProto(cx, clasp, proto, obj));
    if (!nobj)
        return NULL;

    if (!DefineProperty(cx, obj, name, ObjectValue(*nobj), GetterWrapper(NULL),
                        SetterWrapper(NULL), attrs, 0, 0))
    {
        return NULL;
    }

    return nobj;
}

JS_PUBLIC_API(JSBool)
JS_DefineConstDoubles(JSContext *cx, JSObject *objArg, const JSConstDoubleSpec *cds)
{
    RootedObject obj(cx, objArg);
    JSBool ok;
    unsigned attrs;

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JSPropertyOpWrapper noget = GetterWrapper(NULL);
    JSStrictPropertyOpWrapper noset = SetterWrapper(NULL);
    for (ok = JS_TRUE; cds->name; cds++) {
        Value value = DoubleValue(cds->dval);
        attrs = cds->flags;
        if (!attrs)
            attrs = JSPROP_READONLY | JSPROP_PERMANENT;
        ok = DefineProperty(cx, obj, cds->name, value, noget, noset, attrs, 0, 0);
        if (!ok)
            break;
    }
    return ok;
}

JS_PUBLIC_API(JSBool)
JS_DefineProperties(JSContext *cx, JSObject *objArg, const JSPropertySpec *ps)
{
    RootedObject obj(cx, objArg);
    JSBool ok;
    for (ok = true; ps->name; ps++) {
        ok = DefineProperty(cx, obj, ps->name, UndefinedValue(), ps->getter, ps->setter,
                            ps->flags, Shape::HAS_SHORTID, ps->tinyid);
        if (!ok)
            break;
    }
    return ok;
}

static JSBool
GetPropertyDescriptorById(JSContext *cx, HandleObject obj, HandleId id, unsigned flags,
                          JSBool own, PropertyDescriptor *desc)
{
    RootedObject obj2(cx);
    RootedShape shape(cx);

    if (!LookupPropertyById(cx, obj, id, flags, &obj2, &shape))
        return JS_FALSE;

    if (!shape || (own && obj != obj2)) {
        desc->obj = NULL;
        desc->attrs = 0;
        desc->getter = NULL;
        desc->setter = NULL;
        desc->value.setUndefined();
        return JS_TRUE;
    }

    desc->obj = obj2;
    if (obj2->isNative()) {
        if (IsImplicitDenseElement(shape)) {
            desc->attrs = JSPROP_ENUMERATE;
            desc->getter = NULL;
            desc->setter = NULL;
            desc->value = obj2->getDenseElement(JSID_TO_INT(id));
        } else {
            desc->attrs = shape->attributes();
            desc->getter = shape->getter();
            desc->setter = shape->setter();
            if (shape->hasSlot())
                desc->value = obj2->nativeGetSlot(shape->slot());
            else
                desc->value.setUndefined();
        }
    } else {
        if (obj2->isProxy()) {
            JSAutoResolveFlags rf(cx, flags);
            return own
                   ? Proxy::getOwnPropertyDescriptor(cx, obj2, id, desc, 0)
                   : Proxy::getPropertyDescriptor(cx, obj2, id, desc, 0);
        }
        if (!JSObject::getGenericAttributes(cx, obj2, id, &desc->attrs))
            return false;
        desc->getter = NULL;
        desc->setter = NULL;
        desc->value.setUndefined();
    }
    return true;
}

JS_PUBLIC_API(JSBool)
JS_GetPropertyDescriptorById(JSContext *cx, JSObject *objArg, jsid idArg, unsigned flags,
                             JSPropertyDescriptor *desc_)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    AutoPropertyDescriptorRooter desc(cx);
    if (!GetPropertyDescriptorById(cx, obj, id, flags, JS_FALSE, &desc))
        return false;
    *desc_ = desc;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_GetPropertyAttrsGetterAndSetterById(JSContext *cx, JSObject *objArg, jsid idArg,
                                       unsigned *attrsp, JSBool *foundp,
                                       JSPropertyOp *getterp, JSStrictPropertyOp *setterp)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    AutoPropertyDescriptorRooter desc(cx);
    if (!GetPropertyDescriptorById(cx, obj, id, 0, JS_FALSE, &desc))
        return false;

    *attrsp = desc.attrs;
    *foundp = (desc.obj != NULL);
    if (getterp)
        *getterp = desc.getter;
    if (setterp)
        *setterp = desc.setter;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_GetPropertyAttributes(JSContext *cx, JSObject *objArg, const char *name,
                         unsigned *attrsp, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    return atom && JS_GetPropertyAttrsGetterAndSetterById(cx, obj, AtomToId(atom),
                                                          attrsp, foundp, NULL, NULL);
}

JS_PUBLIC_API(JSBool)
JS_GetUCPropertyAttributes(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen,
                           unsigned *attrsp, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    return atom && JS_GetPropertyAttrsGetterAndSetterById(cx, obj, AtomToId(atom),
                                                          attrsp, foundp, NULL, NULL);
}

JS_PUBLIC_API(JSBool)
JS_GetPropertyAttrsGetterAndSetter(JSContext *cx, JSObject *objArg, const char *name,
                                   unsigned *attrsp, JSBool *foundp,
                                   JSPropertyOp *getterp, JSStrictPropertyOp *setterp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    return atom && JS_GetPropertyAttrsGetterAndSetterById(cx, obj, AtomToId(atom),
                                                          attrsp, foundp, getterp, setterp);
}

JS_PUBLIC_API(JSBool)
JS_GetUCPropertyAttrsGetterAndSetter(JSContext *cx, JSObject *objArg,
                                     const jschar *name, size_t namelen,
                                     unsigned *attrsp, JSBool *foundp,
                                     JSPropertyOp *getterp, JSStrictPropertyOp *setterp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    return atom && JS_GetPropertyAttrsGetterAndSetterById(cx, obj, AtomToId(atom),
                                                          attrsp, foundp, getterp, setterp);
}

JS_PUBLIC_API(JSBool)
JS_GetOwnPropertyDescriptor(JSContext *cx, JSObject *objArg, jsid idArg, jsval *vp)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RootedValue value(cx);
    if (!GetOwnPropertyDescriptor(cx, obj, id, &value))
        return false;
    *vp = value;
    return true;
}

static JSBool
SetPropertyAttributesById(JSContext *cx, HandleObject obj, HandleId id, unsigned attrs, JSBool *foundp)
{
    RootedObject obj2(cx);
    RootedShape shape(cx);

    if (!LookupPropertyById(cx, obj, id, 0, &obj2, &shape))
        return false;
    if (!shape || obj != obj2) {
        *foundp = false;
        return true;
    }
    JSBool ok = obj->isNative()
                ? JSObject::changePropertyAttributes(cx, obj, shape, attrs)
                : JSObject::setGenericAttributes(cx, obj, id, &attrs);
    if (ok)
        *foundp = true;
    return ok;
}

JS_PUBLIC_API(JSBool)
JS_SetPropertyAttributes(JSContext *cx, JSObject *objArg, const char *name,
                         unsigned attrs, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    RootedId id(cx, AtomToId(atom));
    return atom && SetPropertyAttributesById(cx, obj, id, attrs, foundp);
}

JS_PUBLIC_API(JSBool)
JS_SetUCPropertyAttributes(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen,
                           unsigned attrs, JSBool *foundp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    RootedId id(cx, AtomToId(atom));
    return atom && SetPropertyAttributesById(cx, obj, id, attrs, foundp);
}

JS_PUBLIC_API(JSBool)
JS_GetPropertyById(JSContext *cx, JSObject *objArg, jsid idArg, jsval *vp)
{
    return JS_ForwardGetPropertyTo(cx, objArg, idArg, objArg, vp);
}

JS_PUBLIC_API(JSBool)
JS_ForwardGetPropertyTo(JSContext *cx, JSObject *objArg, jsid idArg, JSObject *onBehalfOfArg, jsval *vp)
{
    RootedObject obj(cx, objArg);
    RootedObject onBehalfOf(cx, onBehalfOfArg);
    RootedId id(cx, idArg);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);
    assertSameCompartment(cx, onBehalfOf);
    JSAutoResolveFlags rf(cx, 0);

    RootedValue value(cx);
    if (!JSObject::getGeneric(cx, obj, onBehalfOf, id, &value))
        return false;

    *vp = value;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_GetPropertyByIdDefault(JSContext *cx, JSObject *objArg, jsid idArg, jsval defArg, jsval *vp)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    RootedValue def(cx, defArg);

    RootedValue value(cx);
    if (!baseops::GetPropertyDefault(cx, obj, id, def, &value))
        return false;

    *vp = value;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_GetElement(JSContext *cx, JSObject *objArg, uint32_t index, jsval *vp)
{
    return JS_ForwardGetElementTo(cx, objArg, index, objArg, vp);
}

JS_PUBLIC_API(JSBool)
JS_ForwardGetElementTo(JSContext *cx, JSObject *objArg, uint32_t index, JSObject *onBehalfOfArg, jsval *vp)
{
    RootedObject obj(cx, objArg);
    RootedObject onBehalfOf(cx, onBehalfOfArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JSAutoResolveFlags rf(cx, 0);

    RootedValue value(cx);
    if (!JSObject::getElement(cx, obj, onBehalfOf, index, &value))
        return false;

    *vp = value;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_GetElementIfPresent(JSContext *cx, JSObject *objArg, uint32_t index, JSObject *onBehalfOfArg, jsval *vp, JSBool* present)
{
    RootedObject obj(cx, objArg);
    RootedObject onBehalfOf(cx, onBehalfOfArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JSAutoResolveFlags rf(cx, 0);

    RootedValue value(cx);
    bool isPresent;
    if (!JSObject::getElementIfPresent(cx, obj, onBehalfOf, index, &value, &isPresent))
        return false;

    *vp = value;
    *present = isPresent;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_GetProperty(JSContext *cx, JSObject *objArg, const char *name, jsval *vp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    return atom && JS_GetPropertyById(cx, obj, AtomToId(atom), vp);
}

JS_PUBLIC_API(JSBool)
JS_GetPropertyDefault(JSContext *cx, JSObject *objArg, const char *name, jsval defArg, jsval *vp)
{
    RootedObject obj(cx, objArg);
    RootedValue def(cx, defArg);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    return atom && JS_GetPropertyByIdDefault(cx, obj, AtomToId(atom), def, vp);
}

JS_PUBLIC_API(JSBool)
JS_GetUCProperty(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen, jsval *vp)
{
    RootedObject obj(cx, objArg);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    return atom && JS_GetPropertyById(cx, obj, AtomToId(atom), vp);
}

JS_PUBLIC_API(JSBool)
JS_SetPropertyById(JSContext *cx, JSObject *objArg, jsid idArg, jsval *vp)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);
    JSAutoResolveFlags rf(cx, JSRESOLVE_ASSIGNING);

    RootedValue value(cx, *vp);
    if (!JSObject::setGeneric(cx, obj, obj, id, &value, false))
        return false;

    *vp = value;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_SetElement(JSContext *cx, JSObject *objArg, uint32_t index, jsval *vp)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, *vp);
    JSAutoResolveFlags rf(cx, JSRESOLVE_ASSIGNING);

    RootedValue value(cx, *vp);
    if (!JSObject::setElement(cx, obj, obj, index, &value, false))
        return false;

    *vp = value;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_SetProperty(JSContext *cx, JSObject *objArg, const char *name, jsval *vp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    return atom && JS_SetPropertyById(cx, obj, AtomToId(atom), vp);
}

JS_PUBLIC_API(JSBool)
JS_SetUCProperty(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen, jsval *vp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    return atom && JS_SetPropertyById(cx, obj, AtomToId(atom), vp);
}

JS_PUBLIC_API(JSBool)
JS_DeletePropertyById2(JSContext *cx, JSObject *objArg, jsid id, jsval *rval)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);
    JSAutoResolveFlags rf(cx, 0);

    RootedValue value(cx);

    JSBool succeeded;
    if (JSID_IS_SPECIAL(id)) {
        Rooted<SpecialId> sid(cx, JSID_TO_SPECIALID(id));
        if (!JSObject::deleteSpecial(cx, obj, sid, &succeeded))
            return false;
    } else {
        if (!JSObject::deleteByValue(cx, obj, IdToValue(id), &succeeded))
            return false;
    }

    *rval = BooleanValue(succeeded);
    return true;
}

JS_PUBLIC_API(JSBool)
JS_DeleteElement2(JSContext *cx, JSObject *objArg, uint32_t index, jsval *rval)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JSAutoResolveFlags rf(cx, 0);

    JSBool succeeded;
    if (!JSObject::deleteElement(cx, obj, index, &succeeded))
        return false;

    *rval = BooleanValue(succeeded);
    return true;
}

JS_PUBLIC_API(JSBool)
JS_DeleteProperty2(JSContext *cx, JSObject *objArg, const char *name, jsval *rval)
{
    RootedObject obj(cx, objArg);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JSAutoResolveFlags rf(cx, 0);

    JSAtom *atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;

    JSBool succeeded;
    if (!JSObject::deleteByValue(cx, obj, StringValue(atom), &succeeded))
        return false;

    *rval = BooleanValue(succeeded);
    return true;
}

JS_PUBLIC_API(JSBool)
JS_DeleteUCProperty2(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen, jsval *rval)
{
    RootedObject obj(cx, objArg);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JSAutoResolveFlags rf(cx, 0);

    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;

    JSBool succeeded;
    if (!JSObject::deleteByValue(cx, obj, StringValue(atom), &succeeded))
        return false;

    *rval = BooleanValue(succeeded);
    return true;
}

JS_PUBLIC_API(JSBool)
JS_DeletePropertyById(JSContext *cx, JSObject *objArg, jsid idArg)
{
    jsval junk;
    return JS_DeletePropertyById2(cx, objArg, idArg, &junk);
}

JS_PUBLIC_API(JSBool)
JS_DeleteElement(JSContext *cx, JSObject *objArg, uint32_t index)
{
    jsval junk;
    return JS_DeleteElement2(cx, objArg, index, &junk);
}

JS_PUBLIC_API(JSBool)
JS_DeleteProperty(JSContext *cx, JSObject *objArg, const char *name)
{
    jsval junk;
    return JS_DeleteProperty2(cx, objArg, name, &junk);
}

static Shape *
LastConfigurableShape(JSObject *obj)
{
    for (Shape::Range<NoGC> r(obj->lastProperty()); !r.empty(); r.popFront()) {
        Shape *shape = &r.front();
        if (shape->configurable())
            return shape;
    }
    return NULL;
}

JS_PUBLIC_API(void)
JS_ClearNonGlobalObject(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    JS_ASSERT(!obj->is<GlobalObject>());

    if (!obj->isNative())
        return;

    /* Remove all configurable properties from obj. */
    RootedShape shape(cx);
    while ((shape = LastConfigurableShape(obj))) {
        if (!obj->removeProperty(cx, shape->propid()))
            return;
    }

    /* Set all remaining writable plain data properties to undefined. */
    for (Shape::Range<NoGC> r(obj->lastProperty()); !r.empty(); r.popFront()) {
        Shape *shape = &r.front();
        if (shape->isDataDescriptor() &&
            shape->writable() &&
            shape->hasDefaultSetter() &&
            shape->hasSlot())
        {
            obj->nativeSetSlot(shape->slot(), UndefinedValue());
        }
    }
}

JS_PUBLIC_API(void)
JS_SetAllNonReservedSlotsToUndefined(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    if (!obj->isNative())
        return;

    Class *clasp = obj->getClass();
    unsigned numReserved = JSCLASS_RESERVED_SLOTS(clasp);
    unsigned numSlots = obj->slotSpan();
    for (unsigned i = numReserved; i < numSlots; i++)
        obj->setSlot(i, UndefinedValue());
}

JS_PUBLIC_API(JSIdArray *)
JS_Enumerate(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    AutoIdVector props(cx);
    JSIdArray *ida;
    if (!GetPropertyNames(cx, obj, JSITER_OWNONLY, &props) || !VectorToIdArray(cx, props, &ida))
        return NULL;
    return ida;
}

/*
 * XXX reverse iterator for properties, unreverse and meld with jsinterp.c's
 *     prop_iterator_class somehow...
 * + preserve the obj->enumerate API while optimizing the native object case
 * + native case here uses a JSShape *, but that iterates in reverse!
 * + so we make non-native match, by reverse-iterating after JS_Enumerating
 */
const uint32_t JSSLOT_ITER_INDEX = 0;

static void
prop_iter_finalize(FreeOp *fop, JSObject *obj)
{
    void *pdata = obj->getPrivate();
    if (!pdata)
        return;

    if (obj->getSlot(JSSLOT_ITER_INDEX).toInt32() >= 0) {
        /* Non-native case: destroy the ida enumerated when obj was created. */
        JSIdArray *ida = (JSIdArray *) pdata;
        DestroyIdArray(fop, ida);
    }
}

static void
prop_iter_trace(JSTracer *trc, JSObject *obj)
{
    void *pdata = obj->getPrivate();
    if (!pdata)
        return;

    if (obj->getSlot(JSSLOT_ITER_INDEX).toInt32() < 0) {
        /*
         * Native case: just mark the next property to visit. We don't need a
         * barrier here because the pointer is updated via setPrivate, which
         * always takes a barrier.
         */
        Shape *tmp = static_cast<Shape *>(pdata);
        MarkShapeUnbarriered(trc, &tmp, "prop iter shape");
        obj->setPrivateUnbarriered(tmp);
    } else {
        /* Non-native case: mark each id in the JSIdArray private. */
        JSIdArray *ida = (JSIdArray *) pdata;
        MarkIdRange(trc, ida->length, ida->vector, "prop iter");
    }
}

static Class prop_iter_class = {
    "PropertyIterator",
    JSCLASS_HAS_PRIVATE | JSCLASS_IMPLEMENTS_BARRIERS | JSCLASS_HAS_RESERVED_SLOTS(1),
    JS_PropertyStub,         /* addProperty */
    JS_DeletePropertyStub,   /* delProperty */
    JS_PropertyStub,         /* getProperty */
    JS_StrictPropertyStub,   /* setProperty */
    JS_EnumerateStub,
    JS_ResolveStub,
    JS_ConvertStub,
    prop_iter_finalize,
    NULL,           /* checkAccess */
    NULL,           /* call        */
    NULL,           /* construct   */
    NULL,           /* hasInstance */
    prop_iter_trace
};

JS_PUBLIC_API(JSObject *)
JS_NewPropertyIterator(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    RootedObject iterobj(cx, NewObjectWithClassProto(cx, &prop_iter_class, NULL, obj));
    if (!iterobj)
        return NULL;

    int index;
    if (obj->isNative()) {
        /* Native case: start with the last property in obj. */
        iterobj->setPrivateGCThing(obj->lastProperty());
        index = -1;
    } else {
        /* Non-native case: enumerate a JSIdArray and keep it via private. */
        JSIdArray *ida = JS_Enumerate(cx, obj);
        if (!ida)
            return NULL;
        iterobj->setPrivate((void *)ida);
        index = ida->length;
    }

    /* iterobj cannot escape to other threads here. */
    iterobj->setSlot(JSSLOT_ITER_INDEX, Int32Value(index));
    return iterobj;
}

JS_PUBLIC_API(JSBool)
JS_NextProperty(JSContext *cx, JSObject *iterobjArg, jsid *idp)
{
    RootedObject iterobj(cx, iterobjArg);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, iterobj);
    int32_t i = iterobj->getSlot(JSSLOT_ITER_INDEX).toInt32();
    if (i < 0) {
        /* Native case: private data is a property tree node pointer. */
        JS_ASSERT(iterobj->getParent()->isNative());
        Shape *shape = static_cast<Shape *>(iterobj->getPrivate());

        while (shape->previous() && !shape->enumerable())
            shape = shape->previous();

        if (!shape->previous()) {
            JS_ASSERT(shape->isEmptyShape());
            *idp = JSID_VOID;
        } else {
            iterobj->setPrivateGCThing(const_cast<Shape *>(shape->previous().get()));
            *idp = shape->propid();
        }
    } else {
        /* Non-native case: use the ida enumerated when iterobj was created. */
        JSIdArray *ida = (JSIdArray *) iterobj->getPrivate();
        JS_ASSERT(i <= ida->length);
        STATIC_ASSUME(i <= ida->length);
        if (i == 0) {
            *idp = JSID_VOID;
        } else {
            *idp = ida->vector[--i];
            iterobj->setSlot(JSSLOT_ITER_INDEX, Int32Value(i));
        }
    }
    return true;
}

JS_PUBLIC_API(JSBool)
JS_ArrayIterator(JSContext *cx, unsigned argc, jsval *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    Rooted<Value> target(cx, args.thisv());
    AssertHeapIsIdle(cx);
    assertSameCompartment(cx, target);
    CHECK_REQUEST(cx);

    JSObject *iterobj = ElementIteratorObject::create(cx, target);
    if (!iterobj)
        return false;
    vp->setObject(*iterobj);
    return true;
}

JS_PUBLIC_API(jsval)
JS_GetReservedSlot(JSObject *obj, uint32_t index)
{
    return obj->getReservedSlot(index);
}

JS_PUBLIC_API(void)
JS_SetReservedSlot(JSObject *obj, uint32_t index, Value value)
{
    obj->setReservedSlot(index, value);
}

JS_PUBLIC_API(JSObject *)
JS_NewArrayObject(JSContext *cx, int length, jsval *vector)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AutoArrayRooter tvr(cx, length, vector);

    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    assertSameCompartment(cx, JSValueArray(vector, vector ? (uint32_t)length : 0));
    return NewDenseCopiedArray(cx, (uint32_t)length, vector);
}

JS_PUBLIC_API(JSBool)
JS_IsArrayObject(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    assertSameCompartment(cx, obj);
    return ObjectClassIs(obj, ESClass_Array, cx);
}

JS_PUBLIC_API(JSBool)
JS_GetArrayLength(JSContext *cx, JSObject *objArg, uint32_t *lengthp)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    return GetLengthProperty(cx, obj, lengthp);
}

JS_PUBLIC_API(JSBool)
JS_SetArrayLength(JSContext *cx, JSObject *objArg, uint32_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    return SetLengthProperty(cx, obj, length);
}

JS_PUBLIC_API(JSBool)
JS_CheckAccess(JSContext *cx, JSObject *objArg, jsid idArg, JSAccessMode mode,
               jsval *vp, unsigned *attrsp)
{
    RootedObject obj(cx, objArg);
    RootedId id(cx, idArg);
    RootedValue value(cx, *vp);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);
    JSBool status = CheckAccess(cx, obj, id, mode, &value, attrsp);
    *vp = value;
    return status;
}

JS_PUBLIC_API(void)
JS_HoldPrincipals(JSPrincipals *principals)
{
    JS_ATOMIC_INCREMENT(&principals->refcount);
}

JS_PUBLIC_API(void)
JS_DropPrincipals(JSRuntime *rt, JSPrincipals *principals)
{
    int rc = JS_ATOMIC_DECREMENT(&principals->refcount);
    if (rc == 0)
        rt->destroyPrincipals(principals);
}

JS_PUBLIC_API(void)
JS_SetSecurityCallbacks(JSRuntime *rt, const JSSecurityCallbacks *scb)
{
    JS_ASSERT(scb != &NullSecurityCallbacks);
    rt->securityCallbacks = scb ? scb : &NullSecurityCallbacks;
}

JS_PUBLIC_API(const JSSecurityCallbacks *)
JS_GetSecurityCallbacks(JSRuntime *rt)
{
    return (rt->securityCallbacks != &NullSecurityCallbacks) ? rt->securityCallbacks : NULL;
}

JS_PUBLIC_API(void)
JS_SetTrustedPrincipals(JSRuntime *rt, JSPrincipals *prin)
{
    rt->setTrustedPrincipals(prin);
}

extern JS_PUBLIC_API(void)
JS_InitDestroyPrincipalsCallback(JSRuntime *rt, JSDestroyPrincipalsOp destroyPrincipals)
{
    JS_ASSERT(destroyPrincipals);
    JS_ASSERT(!rt->destroyPrincipals);
    rt->destroyPrincipals = destroyPrincipals;
}

JS_PUBLIC_API(JSFunction *)
JS_NewFunction(JSContext *cx, JSNative native, unsigned nargs, unsigned flags,
               JSObject *parentArg, const char *name)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject parent(cx, parentArg);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, parent);

    RootedAtom atom(cx);
    if (name) {
        atom = Atomize(cx, name, strlen(name));
        if (!atom)
            return NULL;
    }

    JSFunction::Flags funFlags = JSAPIToJSFunctionFlags(flags);
    return NewFunction(cx, NullPtr(), native, nargs, funFlags, parent, atom);
}

JS_PUBLIC_API(JSFunction *)
JS_NewFunctionById(JSContext *cx, JSNative native, unsigned nargs, unsigned flags, JSObject *parentArg,
                   jsid id)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject parent(cx, parentArg);
    JS_ASSERT(JSID_IS_STRING(id));
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, parent);

    RootedAtom atom(cx, JSID_TO_ATOM(id));
    JSFunction::Flags funFlags = JSAPIToJSFunctionFlags(flags);
    return NewFunction(cx, NullPtr(), native, nargs, funFlags, parent, atom);
}

JS_PUBLIC_API(JSObject *)
JS_CloneFunctionObject(JSContext *cx, JSObject *funobjArg, JSObject *parentArg)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject funobj(cx, funobjArg);
    RootedObject parent(cx, parentArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, parent);
    // Note that funobj can be in a different compartment.

    if (!parent)
        parent = cx->global();

    if (!funobj->is<JSFunction>()) {
        AutoCompartment ac(cx, funobj);
        ReportIsNotFunction(cx, ObjectValue(*funobj));
        return NULL;
    }

    /*
     * If a function was compiled to be lexically nested inside some other
     * script, we cannot clone it without breaking the compiler's assumptions.
     */
    RootedFunction fun(cx, &funobj->as<JSFunction>());
    if (fun->isInterpretedLazy()) {
        AutoCompartment ac(cx, funobj);
        if (!fun->getOrCreateScript(cx))
            return NULL;
    }
    if (fun->isInterpreted() && (fun->nonLazyScript()->enclosingStaticScope() ||
        (fun->nonLazyScript()->compileAndGo && !parent->is<GlobalObject>())))
    {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_CLONE_FUNOBJ_SCOPE);
        return NULL;
    }

    if (fun->isBoundFunction()) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_CLONE_OBJECT);
        return NULL;
    }

    if (fun->isNative() && IsAsmJSModuleNative(fun->native())) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_CLONE_OBJECT);
        return NULL;
    }

    return CloneFunctionObject(cx, fun, parent, fun->getAllocKind());
}

JS_PUBLIC_API(JSObject *)
JS_GetFunctionObject(JSFunction *fun)
{
    return fun;
}

JS_PUBLIC_API(JSString *)
JS_GetFunctionId(JSFunction *fun)
{
    return fun->atom();
}

JS_PUBLIC_API(JSString *)
JS_GetFunctionDisplayId(JSFunction *fun)
{
    return fun->displayAtom();
}

JS_PUBLIC_API(uint16_t)
JS_GetFunctionArity(JSFunction *fun)
{
    return fun->nargs;
}

JS_PUBLIC_API(JSBool)
JS_ObjectIsFunction(JSContext *cx, JSObject *obj)
{
    return obj->is<JSFunction>();
}

JS_PUBLIC_API(JSBool)
JS_ObjectIsCallable(JSContext *cx, JSObject *obj)
{
    return obj->isCallable();
}

JS_PUBLIC_API(JSBool)
JS_IsNativeFunction(JSObject *funobj, JSNative call)
{
    if (!funobj->is<JSFunction>())
        return false;
    JSFunction *fun = &funobj->as<JSFunction>();
    return fun->isNative() && fun->native() == call;
}

extern JS_PUBLIC_API(JSBool)
JS_IsConstructor(JSFunction *fun)
{
    return fun->isNativeConstructor() || fun->isInterpretedConstructor();
}

JS_PUBLIC_API(JSObject*)
JS_BindCallable(JSContext *cx, JSObject *targetArg, JSObject *newThis)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject target(cx, targetArg);
    RootedValue thisArg(cx, ObjectValue(*newThis));
    return js_fun_bind(cx, target, thisArg, NULL, 0);
}

JSBool
js_generic_native_method_dispatcher(JSContext *cx, unsigned argc, Value *vp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    CallArgs args = CallArgsFromVp(argc, vp);

    const JSFunctionSpec *fs = (JSFunctionSpec *)
        vp->toObject().as<JSFunction>().getExtendedSlot(0).toPrivate();
    JS_ASSERT((fs->flags & JSFUN_GENERIC_NATIVE) != 0);

    if (argc < 1) {
        js_ReportMissingArg(cx, args.calleev(), 0);
        return JS_FALSE;
    }

    /*
     * Copy all actual (argc) arguments down over our |this| parameter, vp[1],
     * which is almost always the class constructor object, e.g. Array.  Then
     * call the corresponding prototype native method with our first argument
     * passed as |this|.
     */
    memmove(vp + 1, vp + 2, argc * sizeof(jsval));

    /* Clear the last parameter in case too few arguments were passed. */
    vp[2 + --argc].setUndefined();

    return fs->call.op(cx, argc, vp);
}

JS_PUBLIC_API(JSBool)
JS_DefineFunctions(JSContext *cx, JSObject *objArg, const JSFunctionSpec *fs)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, objArg);

    RootedObject obj(cx, objArg);
    RootedObject ctor(cx);

    for (; fs->name; fs++) {
        RootedAtom atom(cx, Atomize(cx, fs->name, strlen(fs->name)));
        if (!atom)
            return JS_FALSE;

        Rooted<jsid> id(cx, AtomToId(atom));

        /*
         * Define a generic arity N+1 static method for the arity N prototype
         * method if flags contains JSFUN_GENERIC_NATIVE.
         */
        unsigned flags = fs->flags;
        if (flags & JSFUN_GENERIC_NATIVE) {
            if (!ctor) {
                ctor = JS_GetConstructor(cx, obj);
                if (!ctor)
                    return JS_FALSE;
            }

            flags &= ~JSFUN_GENERIC_NATIVE;
            JSFunction *fun = DefineFunction(cx, ctor, id,
                                             js_generic_native_method_dispatcher,
                                             fs->nargs + 1, flags,
                                             JSFunction::ExtendedFinalizeKind);
            if (!fun)
                return JS_FALSE;

            /*
             * As jsapi.h notes, fs must point to storage that lives as long
             * as fun->object lives.
             */
            fun->setExtendedSlot(0, PrivateValue(const_cast<JSFunctionSpec*>(fs)));
        }

        /*
         * Delay cloning self-hosted functions until they are called. This is
         * achieved by passing DefineFunction a NULL JSNative which
         * produces an interpreted JSFunction where !hasScript. Interpreted
         * call paths then call InitializeLazyFunctionScript if !hasScript.
         */
        if (fs->selfHostedName) {
            /*
             * During creation of the self-hosting global, we ignore all
             * self-hosted functions, as that means we're currently setting up
             * the global object that the self-hosted code is then compiled
             * in. Self-hosted functions can access each other via their names,
             * but not via the builtin classes they get installed into.
             */
            if (cx->runtime()->isSelfHostingGlobal(cx->global()))
                continue;

            RootedAtom shAtom(cx, Atomize(cx, fs->selfHostedName, strlen(fs->selfHostedName)));
            if (!shAtom)
                return JS_FALSE;
            RootedPropertyName shName(cx, shAtom->asPropertyName());
            RootedValue funVal(cx);
            if (!cx->runtime()->maybeWrappedSelfHostedFunction(cx, shName, &funVal))
                return JS_FALSE;
            if (!funVal.isUndefined()) {
                if (!JSObject::defineProperty(cx, obj, atom->asPropertyName(), funVal,
                                             NULL, NULL, flags & ~JSFUN_FLAGS_MASK))
                {
                    return JS_FALSE;
                }
            } else {
                JSFunction *fun = DefineFunction(cx, obj, id, /* native = */ NULL, fs->nargs, 0,
                                                 JSFunction::ExtendedFinalizeKind, SingletonObject);
                if (!fun)
                    return JS_FALSE;
                fun->setIsSelfHostedBuiltin();
                fun->setExtendedSlot(0, PrivateValue(const_cast<JSFunctionSpec*>(fs)));
                funVal.setObject(*fun);
            }
            RootedObject holder(cx, cx->global()->intrinsicsHolder());
            if (!JSObject::defineProperty(cx, holder, shName, funVal))
                return JS_FALSE;
        } else {
            JSFunction *fun = DefineFunction(cx, obj, id, fs->call.op, fs->nargs, flags);
            if (!fun)
                return JS_FALSE;
            if (fs->call.info)
                fun->setJitInfo(fs->call.info);
        }
    }
    return JS_TRUE;
}

JS_PUBLIC_API(JSFunction *)
JS_DefineFunction(JSContext *cx, JSObject *objArg, const char *name, JSNative call,
                  unsigned nargs, unsigned attrs)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return NULL;
    Rooted<jsid> id(cx, AtomToId(atom));
    return DefineFunction(cx, obj, id, call, nargs, attrs);
}

JS_PUBLIC_API(JSFunction *)
JS_DefineUCFunction(JSContext *cx, JSObject *objArg,
                    const jschar *name, size_t namelen, JSNative call,
                    unsigned nargs, unsigned attrs)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JSAtom *atom = AtomizeChars<CanGC>(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return NULL;
    Rooted<jsid> id(cx, AtomToId(atom));
    return DefineFunction(cx, obj, id, call, nargs, attrs);
}

extern JS_PUBLIC_API(JSFunction *)
JS_DefineFunctionById(JSContext *cx, JSObject *objArg, jsid id_, JSNative call,
                      unsigned nargs, unsigned attrs)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    RootedId id(cx, id_);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    return DefineFunction(cx, obj, id, call, nargs, attrs);
}

struct AutoLastFrameCheck
{
    AutoLastFrameCheck(JSContext *cx
                       MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
      : cx(cx)
    {
        JS_ASSERT(cx);
        MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    }

    ~AutoLastFrameCheck() {
        if (cx->isExceptionPending() &&
            !JS_IsRunning(cx) &&
            !cx->hasOption(JSOPTION_DONT_REPORT_UNCAUGHT)) {
            js_ReportUncaughtException(cx);
        }
    }

  private:
    JSContext *cx;
    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

/* Use the fastest available getc. */
#if defined(HAVE_GETC_UNLOCKED)
# define fast_getc getc_unlocked
#elif defined(HAVE__GETC_NOLOCK)
# define fast_getc _getc_nolock
#else
# define fast_getc getc
#endif

typedef Vector<char, 8, TempAllocPolicy> FileContents;

#if defined(STARBOARD)
static bool
ReadCompleteFile(JSContext *cx, SbFile file, FileContents &buffer)
{
    TRACK_MEMORY_SCOPE("Javascript");
    SbFileInfo info;
    bool success = SbFileGetInfo(file, &info);
    if (!success) {
        return false;
    }
    const int64_t kFileSize = info.size;
    buffer.resize(kFileSize);
    if (SbFileReadAll(file, buffer.begin(), kFileSize) < 0) {
        return false;
    }

    return true;
}

class AutoFile
{
    SbFile sb_file_;
  public:
    AutoFile() {}
    ~AutoFile()
    {
        SbFileClose(sb_file_);
    }
    SbFile sb_file() const { return sb_file_; }
    bool open(JSContext *cx, const char *filename);
    bool readAll(JSContext *cx, FileContents &buffer)
    {
        return ReadCompleteFile(cx, sb_file_, buffer);
    }
};

/*
 * Open a source file for reading. Supports "-" and NULL to mean stdin. The
 * return value must be fclosed unless it is stdin.
 */
bool
AutoFile::open(JSContext *cx, const char *filename)
{
    TRACK_MEMORY_SCOPE("Javascript");
    // Starboard does not support stdin.
    if (!filename || strcmp(filename, "-") == 0) {
        return false;
    } else {
        sb_file_ = SbFileOpen(filename, kSbFileOpenOnly | kSbFileRead, NULL,
            NULL);
        if (!SbFileIsValid(sb_file_)) {
            JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_OPEN,
                                 filename, "No such file or directory");
            return false;
        }
    }
    return true;
}
#else  // #if defined(STARBOARD)
static bool
ReadCompleteFile(JSContext *cx, FILE *fp, FileContents &buffer)
{
    /* Get the complete length of the file, if possible. */
    struct stat st;
    int ok = fstat(fileno(fp), &st);
    if (ok != 0)
        return false;
    if (st.st_size > 0) {
        if (!buffer.reserve(st.st_size))
            return false;
    }

    // Read in the whole file. Note that we can't assume the data's length
    // is actually st.st_size, because 1) some files lie about their size
    // (/dev/zero and /dev/random), and 2) reading files in text mode on
    // Windows collapses "\r\n" pairs to single \n characters.
    for (;;) {
        int c = fast_getc(fp);
        if (c == EOF)
            break;
        if (!buffer.append(c))
            return false;
    }

    return true;
}

class AutoFile
{
    FILE *fp_;
  public:
    AutoFile()
      : fp_(NULL)
    {}
    ~AutoFile()
    {
        if (fp_ && fp_ != stdin)
            fclose(fp_);
    }
    FILE *fp() const { return fp_; }
    bool open(JSContext *cx, const char *filename);
    bool readAll(JSContext *cx, FileContents &buffer)
    {
        JS_ASSERT(fp_);
        return ReadCompleteFile(cx, fp_, buffer);
    }
};

/*
 * Open a source file for reading. Supports "-" and NULL to mean stdin. The
 * return value must be fclosed unless it is stdin.
 */
bool
AutoFile::open(JSContext *cx, const char *filename)
{
    if (!filename || strcmp(filename, "-") == 0) {
        fp_ = stdin;
    } else {
        fp_ = fopen(filename, "r");
        if (!fp_) {
            JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CANT_OPEN,
                                 filename, "No such file or directory");
            return false;
        }
    }
    return true;
}

#endif  // #if defined(STARBOARD)

JS::CompileOptions::CompileOptions(JSContext *cx, JSVersion version)
    : principals(NULL),
      originPrincipals(NULL),
      version(version != JSVERSION_UNKNOWN ? version : cx->findVersion()),
      versionSet(false),
      utf8(false),
      filename(NULL),
      lineno(1),
      column(0),
      element(NullPtr()),
      compileAndGo(cx->hasOption(JSOPTION_COMPILE_N_GO)),
      forEval(false),
      noScriptRval(cx->hasOption(JSOPTION_NO_SCRIPT_RVAL)),
      selfHostingMode(false),
      canLazilyParse(true),
      sourcePolicy(SAVE_SOURCE)
{
}

JSScript *
JS::Compile(JSContext *cx, HandleObject obj, CompileOptions options,
            const jschar *chars, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JS_ASSERT_IF(options.principals, cx->compartment()->principals == options.principals);
    AutoLastFrameCheck lfc(cx);

    return frontend::CompileScript(cx, obj, NullPtr(), options, chars, length);
}

JSScript *
JS::Compile(JSContext *cx, HandleObject obj, CompileOptions options,
            const char *bytes, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    jschar *chars;
    if (options.utf8)
        chars = InflateUTF8String(cx, bytes, &length);
    else
        chars = InflateString(cx, bytes, &length);
    if (!chars)
        return NULL;

    JSScript *script = Compile(cx, obj, options, chars, length);
    js_free(chars);
    return script;
}

#if defined(STARBOARD)
JSScript *
JS::Compile(JSContext *cx, HandleObject obj, CompileOptions options,
            SbFile file)
{
    TRACK_MEMORY_SCOPE("Javascript");
    SbFileInfo info;
    bool success = SbFileGetInfo(file, &info);
    if (!success) {
        return NULL;
    }
    const int64_t kFileSize = info.size;
    FileContents buffer(cx);
    buffer.resize(kFileSize);
    if (SbFileReadAll(file, buffer.begin(), kFileSize) < 0) {
        return NULL;
    }
    JSScript *script = Compile(cx, obj, options, buffer.begin(),
                               buffer.length());
    return script;
}
#else
JSScript *
JS::Compile(JSContext *cx, HandleObject obj, CompileOptions options, FILE *fp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    FileContents buffer(cx);
    if (!ReadCompleteFile(cx, fp, buffer))
        return NULL;

    JSScript *script = Compile(cx, obj, options, buffer.begin(), buffer.length());
    return script;
}
#endif

JSScript *
JS::Compile(JSContext *cx, HandleObject obj, CompileOptions options, const char *filename)
{
    TRACK_MEMORY_SCOPE("Javascript");
#if defined(STARBOARD)
    starboard::ScopedFile file(filename, kSbFileOpenOnly | kSbFileRead, NULL,
                               NULL);
    if (!file.IsValid()) {
        return NULL;
    }
    options = options.setFileAndLine(filename, 1);
    JSScript *script = Compile(cx, obj, options, file.file());
#else
    AutoFile file;
    if (!file.open(cx, filename))
        return NULL;
    options = options.setFileAndLine(filename, 1);
    JSScript *script = Compile(cx, obj, options, file.fp());
#endif
    return script;
}

JS_PUBLIC_API(JSScript *)
JS_CompileUCScriptForPrincipals(JSContext *cx, JSObject *objArg, JSPrincipals *principals,
                                const jschar *chars, size_t length,
                                const char *filename, unsigned lineno)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setPrincipals(principals)
           .setFileAndLine(filename, lineno);

    return Compile(cx, obj, options, chars, length);
}

JS_PUBLIC_API(JSScript *)
JS_CompileUCScript(JSContext *cx, JSObject *objArg, const jschar *chars, size_t length,
                   const char *filename, unsigned lineno)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setFileAndLine(filename, lineno);

    return Compile(cx, obj, options, chars, length);
}

JS_PUBLIC_API(JSScript *)
JS_CompileScriptForPrincipals(JSContext *cx, JSObject *objArg,
                              JSPrincipals *principals,
                              const char *ascii, size_t length,
                              const char *filename, unsigned lineno)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setPrincipals(principals)
           .setFileAndLine(filename, lineno);

    return Compile(cx, obj, options, ascii, length);
}

JS_PUBLIC_API(JSScript *)
JS_CompileScript(JSContext *cx, JSObject *objArg, const char *ascii, size_t length,
                 const char *filename, unsigned lineno)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setFileAndLine(filename, lineno);

    return Compile(cx, obj, options, ascii, length);
}

JS_PUBLIC_API(JSBool)
JS_BufferIsCompilableUnit(JSContext *cx, JSObject *objArg, const char *utf8, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    JSBool result;
    JSExceptionState *exnState;
    JSErrorReporter older;

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    jschar *chars = InflateUTF8String(cx, utf8, &length);
    if (!chars)
        return JS_TRUE;

    /*
     * Return true on any out-of-memory error, so our caller doesn't try to
     * collect more buffered source.
     */
    result = JS_TRUE;
    exnState = JS_SaveExceptionState(cx);
    {
        CompileOptions options(cx);
        options.setCompileAndGo(false);
        Parser<frontend::FullParseHandler> parser(cx, options, chars, length,
                                                  /* foldConstants = */ true, NULL, NULL);
        older = JS_SetErrorReporter(cx, NULL);
        if (!parser.parse(obj) && parser.tokenStream.isUnexpectedEOF()) {
            /*
             * We ran into an error. If it was because we ran out of
             * source, we return false so our caller knows to try to
             * collect more buffered source.
             */
            result = JS_FALSE;
        }
        JS_SetErrorReporter(cx, older);
    }
    js_free(chars);
    JS_RestoreExceptionState(cx, exnState);
    return result;
}

JS_PUBLIC_API(JSObject *)
JS_GetGlobalFromScript(JSScript *script)
{
    JS_ASSERT(!script->isCachedEval);
    return &script->global();
}

JS_PUBLIC_API(JSFunction *)
JS::CompileFunction(JSContext *cx, HandleObject obj, CompileOptions options,
                    const char *name, unsigned nargs, const char **argnames,
                    const jschar *chars, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JS_ASSERT_IF(options.principals, cx->compartment()->principals == options.principals);
    AutoLastFrameCheck lfc(cx);

    RootedAtom funAtom(cx);
    if (name) {
        funAtom = Atomize(cx, name, strlen(name));
        if (!funAtom)
            return NULL;
    }

    AutoNameVector formals(cx);
    for (unsigned i = 0; i < nargs; i++) {
        RootedAtom argAtom(cx, Atomize(cx, argnames[i], strlen(argnames[i])));
        if (!argAtom || !formals.append(argAtom->asPropertyName()))
            return NULL;
    }

    RootedFunction fun(cx, NewFunction(cx, NullPtr(), NULL, 0, JSFunction::INTERPRETED, obj,
                                       funAtom, JSFunction::FinalizeKind, TenuredObject));
    if (!fun)
        return NULL;

    if (!frontend::CompileFunctionBody(cx, &fun, options, formals, chars, length))
        return NULL;

    if (obj && funAtom) {
        Rooted<jsid> id(cx, AtomToId(funAtom));
        RootedValue value(cx, ObjectValue(*fun));
        if (!JSObject::defineGeneric(cx, obj, id, value, NULL, NULL, JSPROP_ENUMERATE))
            return NULL;
    }

    return fun;
}

JS_PUBLIC_API(JSFunction *)
JS::CompileFunction(JSContext *cx, HandleObject obj, CompileOptions options,
                    const char *name, unsigned nargs, const char **argnames,
                    const char *bytes, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    jschar *chars;
    if (options.utf8)
        chars = InflateUTF8String(cx, bytes, &length);
    else
        chars = InflateString(cx, bytes, &length);
    if (!chars)
        return NULL;

    JSFunction *fun = CompileFunction(cx, obj, options, name, nargs, argnames, chars, length);
    js_free(chars);
    return fun;
}

JS_PUBLIC_API(JSFunction *)
JS_CompileUCFunction(JSContext *cx, JSObject *objArg, const char *name,
                     unsigned nargs, const char **argnames,
                     const jschar *chars, size_t length,
                     const char *filename, unsigned lineno)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setFileAndLine(filename, lineno);

    return CompileFunction(cx, obj, options, name, nargs, argnames, chars, length);
}

JS_PUBLIC_API(JSFunction *)
JS_CompileFunctionForPrincipals(JSContext *cx, JSObject *objArg,
                                JSPrincipals *principals, const char *name,
                                unsigned nargs, const char **argnames,
                                const char *ascii, size_t length,
                                const char *filename, unsigned lineno)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setPrincipals(principals)
           .setFileAndLine(filename, lineno);

    return CompileFunction(cx, obj, options, name, nargs, argnames, ascii, length);
}

JS_PUBLIC_API(JSFunction *)
JS_CompileFunction(JSContext *cx, JSObject *objArg, const char *name,
                   unsigned nargs, const char **argnames,
                   const char *ascii, size_t length,
                   const char *filename, unsigned lineno)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setFileAndLine(filename, lineno);

    return CompileFunction(cx, obj, options, name, nargs, argnames, ascii, length);
}

JS_PUBLIC_API(JSString *)
JS_DecompileScript(JSContext *cx, JSScript *scriptArg, const char *name, unsigned indent)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    RootedScript script(cx, scriptArg);
    RootedFunction fun(cx, script->function());
    if (fun)
        return JS_DecompileFunction(cx, fun, indent);
    bool haveSource = script->scriptSource()->hasSourceData();
    if (!haveSource && !JSScript::loadSource(cx, script, &haveSource))
        return NULL;
    return haveSource ? script->sourceData(cx) : js_NewStringCopyZ<CanGC>(cx, "[no source]");
}

JS_PUBLIC_API(JSString *)
JS_DecompileFunction(JSContext *cx, JSFunction *funArg, unsigned indent)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, funArg);
    RootedFunction fun(cx, funArg);
    return FunctionToString(cx, fun, false, !(indent & JS_DONT_PRETTY_PRINT));
}

JS_PUBLIC_API(JSString *)
JS_DecompileFunctionBody(JSContext *cx, JSFunction *funArg, unsigned indent)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, funArg);
    RootedFunction fun(cx, funArg);
    return FunctionToString(cx, fun, true, !(indent & JS_DONT_PRETTY_PRINT));
}

JS_NEVER_INLINE JS_PUBLIC_API(JSBool)
JS_ExecuteScript(JSContext *cx, JSObject *objArg, JSScript *scriptArg, jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    RootedScript script(cx, scriptArg);

    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    if (cx->compartment() != obj->compartment())
        *(volatile int *) 0 = 0xf0;
    AutoLastFrameCheck lfc(cx);

    /*
     * Mozilla caches pre-compiled scripts (e.g., in the XUL prototype cache)
     * and runs them against multiple globals. With a compartment per global,
     * this requires cloning the pre-compiled script into each new global.
     * Since each script gets run once, there is no point in trying to cache
     * this clone. Ideally, this would be handled at some pinch point in
     * mozilla, but there doesn't seem to be one, so we handle it here.
     */
    if (script->compartment() != obj->compartment()) {
        script = CloneScript(cx, NullPtr(), NullPtr(), script);
        if (!script.get())
            return false;
    } else {
        script = scriptArg;
    }

    return Execute(cx, script, *obj, rval);
}

JS_PUBLIC_API(JSBool)
JS_ExecuteScriptVersion(JSContext *cx, JSObject *objArg, JSScript *script, jsval *rval,
                        JSVersion version)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    return JS_ExecuteScript(cx, obj, script, rval);
}

static const unsigned LARGE_SCRIPT_LENGTH = 500*1024;

extern JS_PUBLIC_API(bool)
JS::Evaluate(JSContext *cx, HandleObject obj, CompileOptions options,
             const jschar *chars, size_t length, jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JS_ASSERT_IF(options.principals, cx->compartment()->principals == options.principals);

    AutoLastFrameCheck lfc(cx);

    options.setCompileAndGo(obj->is<GlobalObject>());
    options.setNoScriptRval(!rval);
    SourceCompressionToken sct(cx);
    RootedScript script(cx, frontend::CompileScript(cx, obj, NullPtr(), options,
                                                    chars, length, NULL, 0, &sct));
    if (!script)
        return false;

    JS_ASSERT(script->getVersion() == options.version);

    bool result = Execute(cx, script, *obj, rval);
    if (!sct.complete())
        result = false;

    // After evaluation, the compiled script will not be run again.
    // script->ensureRanAnalysis allocated 1 analyze::Bytecode for every opcode
    // which for large scripts means significant memory. Perform a GC eagerly
    // to clear out this analysis data before anything happens to inhibit the
    // flushing of this memory (such as setting requestAnimationFrame).
    if (script->length > LARGE_SCRIPT_LENGTH) {
        script = NULL;
        PrepareZoneForGC(cx->zone());
        GC(cx->runtime(), GC_NORMAL, gcreason::FINISH_LARGE_EVALUTE);
    }

    return result;
}

extern JS_PUBLIC_API(bool)
JS::Evaluate(JSContext *cx, HandleObject obj, CompileOptions options,
             const char *bytes, size_t length, jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    jschar *chars;
    if (options.utf8)
        chars = InflateUTF8String(cx, bytes, &length);
    else
        chars = InflateString(cx, bytes, &length);
    if (!chars)
        return false;

    bool ok = Evaluate(cx, obj, options, chars, length, rval);
    js_free(chars);
    return ok;
}

extern JS_PUBLIC_API(bool)
JS::Evaluate(JSContext *cx, HandleObject obj, CompileOptions options,
             const char *filename, jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
#if defined(STARBOARD)
    starboard::ScopedFile file(filename, kSbFileOpenOnly | kSbFileRead, NULL,
                               NULL);
    const int64_t kFileSize = file.GetSize();
    FileContents buffer(cx);
    buffer.resize(kFileSize);
    if (file.ReadAll(buffer.begin(), kFileSize) < 0) {
        return false;
    }
#else
    FileContents buffer(cx);
    {
        AutoFile file;
        if (!file.open(cx, filename) || !file.readAll(cx, buffer))
            return false;
    }
#endif

    options.setFileAndLine(filename, 1);
    return Evaluate(cx, obj, options, buffer.begin(), buffer.length(), rval);
}

JS_PUBLIC_API(JSBool)
JS_EvaluateUCScriptForPrincipals(JSContext *cx, JSObject *objArg,
                                 JSPrincipals *principals,
                                 const jschar *chars, unsigned length,
                                 const char *filename, unsigned lineno,
                                 jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setPrincipals(principals)
           .setFileAndLine(filename, lineno);

    return Evaluate(cx, obj, options, chars, length, rval);
}

JS_PUBLIC_API(JSBool)
JS_EvaluateUCScriptForPrincipalsVersion(JSContext *cx, JSObject *objArg,
                                        JSPrincipals *principals,
                                        const jschar *chars, unsigned length,
                                        const char *filename, unsigned lineno,
                                        jsval *rval, JSVersion version)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setPrincipals(principals)
           .setFileAndLine(filename, lineno)
           .setVersion(version);

    return Evaluate(cx, obj, options, chars, length, rval);
}

extern JS_PUBLIC_API(JSBool)
JS_EvaluateUCScriptForPrincipalsVersionOrigin(JSContext *cx, JSObject *objArg,
                                              JSPrincipals *principals,
                                              JSPrincipals *originPrincipals,
                                              const jschar *chars, unsigned length,
                                              const char *filename, unsigned lineno,
                                              jsval *rval, JSVersion version)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setPrincipals(principals)
           .setOriginPrincipals(originPrincipals)
           .setFileAndLine(filename, lineno)
           .setVersion(version);

    return Evaluate(cx, obj, options, chars, length, rval);
}

JS_PUBLIC_API(JSBool)
JS_EvaluateUCScript(JSContext *cx, JSObject *objArg, const jschar *chars, unsigned length,
                    const char *filename, unsigned lineno, jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setFileAndLine(filename, lineno);

    return Evaluate(cx, obj, options, chars, length, rval);
}

/* Ancient unsigned nbytes is part of API/ABI, so use size_t length local. */
JS_PUBLIC_API(JSBool)
JS_EvaluateScriptForPrincipals(JSContext *cx, JSObject *objArg, JSPrincipals *principals,
                               const char *bytes, unsigned nbytes,
                               const char *filename, unsigned lineno, jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setPrincipals(principals)
           .setFileAndLine(filename, lineno);

    return Evaluate(cx, obj, options, bytes, nbytes, rval);
}

JS_PUBLIC_API(JSBool)
JS_EvaluateScriptForPrincipalsVersion(JSContext *cx, JSObject *objArg, JSPrincipals *principals,
                                      const char *bytes, unsigned nbytes,
                                      const char *filename, unsigned lineno, jsval *rval,
                                      JSVersion version)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setPrincipals(principals)
           .setVersion(version)
           .setFileAndLine(filename, lineno);

    return Evaluate(cx, obj, options, bytes, nbytes, rval);
}

JS_PUBLIC_API(JSBool)
JS_EvaluateScript(JSContext *cx, JSObject *objArg, const char *bytes, unsigned nbytes,
                  const char *filename, unsigned lineno, jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    CompileOptions options(cx);
    options.setFileAndLine(filename, lineno);

    return Evaluate(cx, obj, options, bytes, nbytes, rval);
}

JS_PUBLIC_API(JSBool)
JS_CallFunction(JSContext *cx, JSObject *objArg, JSFunction *fun, unsigned argc, jsval *argv,
                jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, fun, JSValueArray(argv, argc));
    AutoLastFrameCheck lfc(cx);

    return Invoke(cx, ObjectOrNullValue(obj), ObjectValue(*fun), argc, argv, rval);
}

JS_PUBLIC_API(JSBool)
JS_CallFunctionName(JSContext *cx, JSObject *objArg, const char *name, unsigned argc, jsval *argv,
                    jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, JSValueArray(argv, argc));
    AutoLastFrameCheck lfc(cx);

    JSAtom *atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;

    RootedValue v(cx);
    RootedId id(cx, AtomToId(atom));
    return JSObject::getGeneric(cx, obj, obj, id, &v) &&
           Invoke(cx, ObjectOrNullValue(obj), v, argc, argv, rval);
}

JS_PUBLIC_API(JSBool)
JS_CallFunctionValue(JSContext *cx, JSObject *objArg, jsval fval, unsigned argc, jsval *argv,
                     jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    JS_THREADSAFE_ASSERT(cx->compartment() != cx->runtime()->atomsCompartment);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, fval, JSValueArray(argv, argc));
    AutoLastFrameCheck lfc(cx);

    return Invoke(cx, ObjectOrNullValue(obj), fval, argc, argv, rval);
}

JS_PUBLIC_API(bool)
JS::Call(JSContext *cx, jsval thisv, jsval fval, unsigned argc, jsval *argv, jsval *rval)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, thisv, fval, JSValueArray(argv, argc));
    AutoLastFrameCheck lfc(cx);

    return Invoke(cx, thisv, fval, argc, argv, rval);
}

JS_PUBLIC_API(JSObject *)
JS_New(JSContext *cx, JSObject *ctorArg, unsigned argc, jsval *argv)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject ctor(cx, ctorArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, ctor, JSValueArray(argv, argc));
    AutoLastFrameCheck lfc(cx);

    // This is not a simple variation of JS_CallFunctionValue because JSOP_NEW
    // is not a simple variation of JSOP_CALL. We have to determine what class
    // of object to create, create it, and clamp the return value to an object,
    // among other details. InvokeConstructor does the hard work.
    InvokeArgs args(cx);
    if (!args.init(argc))
        return NULL;

    args.setCallee(ObjectValue(*ctor));
    args.setThis(NullValue());
    PodCopy(args.array(), argv, argc);

    if (!InvokeConstructor(cx, args))
        return NULL;

    if (!args.rval().isObject()) {
        /*
         * Although constructors may return primitives (via proxies), this
         * API is asking for an object, so we report an error.
         */
        JSAutoByteString bytes;
        if (js_ValueToPrintable(cx, args.rval(), &bytes)) {
            JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_NEW_RESULT,
                                 bytes.ptr());
        }
        return NULL;
    }

    return &args.rval().toObject();
}

JS_PUBLIC_API(JSOperationCallback)
JS_SetOperationCallback(JSContext *cx, JSOperationCallback callback)
{
    JSOperationCallback old = cx->operationCallback;
    cx->operationCallback = callback;
    return old;
}

JS_PUBLIC_API(JSOperationCallback)
JS_GetOperationCallback(JSContext *cx)
{
    return cx->operationCallback;
}

JS_PUBLIC_API(void)
JS_TriggerOperationCallback(JSRuntime *rt)
{
    TRACK_MEMORY_SCOPE("Javascript");
    rt->triggerOperationCallback();
}

JS_PUBLIC_API(JSBool)
JS_IsRunning(JSContext *cx)
{
    return cx->currentlyRunning();
}

JS_PUBLIC_API(JSBool)
JS_SaveFrameChain(JSContext *cx)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdleOrIterating(cx);
    CHECK_REQUEST(cx);
    return cx->saveFrameChain();
}

JS_PUBLIC_API(void)
JS_RestoreFrameChain(JSContext *cx)
{
    AssertHeapIsIdleOrIterating(cx);
    CHECK_REQUEST(cx);
    cx->restoreFrameChain();
}

#ifdef MOZ_TRACE_JSCALLS
JS_PUBLIC_API(void)
JS_SetFunctionCallback(JSContext *cx, JSFunctionCallback fcb)
{
    cx->functionCallback = fcb;
}

JS_PUBLIC_API(JSFunctionCallback)
JS_GetFunctionCallback(JSContext *cx)
{
    return cx->functionCallback;
}
#endif

/************************************************************************/
JS_PUBLIC_API(JSString *)
JS_NewStringCopyN(JSContext *cx, const char *s, size_t n)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return js_NewStringCopyN<CanGC>(cx, s, n);
}

JS_PUBLIC_API(JSString *)
JS_NewStringCopyZ(JSContext *cx, const char *s)
{
    TRACK_MEMORY_SCOPE("Javascript");
    size_t n;
    jschar *js;
    JSString *str;

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (!s || !*s)
        return cx->runtime()->emptyString;
    n = strlen(s);
    js = InflateString(cx, s, &n);
    if (!js)
        return NULL;
    str = js_NewString<CanGC>(cx, js, n);
    if (!str)
        js_free(js);
    return str;
}

JS_PUBLIC_API(JSBool)
JS_StringHasBeenInterned(JSContext *cx, JSString *str)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    if (!str->isAtom())
        return false;

    return AtomIsInterned(cx, &str->asAtom());
}

JS_PUBLIC_API(jsid)
INTERNED_STRING_TO_JSID(JSContext *cx, JSString *str)
{
    JS_ASSERT(str);
    JS_ASSERT(((size_t)str & JSID_TYPE_MASK) == 0);
    JS_ASSERT_IF(cx, JS_StringHasBeenInterned(cx, str));
    return AtomToId(&str->asAtom());
}

JS_PUBLIC_API(JSString *)
JS_InternJSString(JSContext *cx, JSString *str)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JSAtom *atom = AtomizeString<CanGC>(cx, str, InternAtom);
    JS_ASSERT_IF(atom, JS_StringHasBeenInterned(cx, atom));
    return atom;
}

JS_PUBLIC_API(JSString *)
JS_InternString(JSContext *cx, const char *s)
{
    TRACK_MEMORY_SCOPE("Javascript");
    return JS_InternStringN(cx, s, strlen(s));
}

JS_PUBLIC_API(JSString *)
JS_InternStringN(JSContext *cx, const char *s, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JSAtom *atom = Atomize(cx, s, length, InternAtom);
    JS_ASSERT_IF(atom, JS_StringHasBeenInterned(cx, atom));
    return atom;
}

JS_PUBLIC_API(JSString *)
JS_NewUCString(JSContext *cx, jschar *chars, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return js_NewString<CanGC>(cx, chars, length);
}

JS_PUBLIC_API(JSString *)
JS_NewUCStringCopyN(JSContext *cx, const jschar *s, size_t n)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return js_NewStringCopyN<CanGC>(cx, s, n);
}

JS_PUBLIC_API(JSString *)
JS_NewUCStringCopyZ(JSContext *cx, const jschar *s)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (!s)
        return cx->runtime()->emptyString;
    return js_NewStringCopyZ<CanGC>(cx, s);
}

JS_PUBLIC_API(JSString *)
JS_InternUCStringN(JSContext *cx, const jschar *s, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JSAtom *atom = AtomizeChars<CanGC>(cx, s, length, InternAtom);
    JS_ASSERT_IF(atom, JS_StringHasBeenInterned(cx, atom));
    return atom;
}

JS_PUBLIC_API(JSString *)
JS_InternUCString(JSContext *cx, const jschar *s)
{
    TRACK_MEMORY_SCOPE("Javascript");
    return JS_InternUCStringN(cx, s, js_strlen(s));
}

JS_PUBLIC_API(size_t)
JS_GetStringLength(JSString *str)
{
    return str->length();
}

JS_PUBLIC_API(const jschar *)
JS_GetStringCharsZ(JSContext *cx, JSString *str)
{
    size_t dummy;
    return JS_GetStringCharsZAndLength(cx, str, &dummy);
}

JS_PUBLIC_API(const jschar *)
JS_GetStringCharsZAndLength(JSContext *cx, JSString *str, size_t *plength)
{
    /*
     * Don't require |cx->compartment()| to be |str|'s compartment. We don't need
     * it, and it's annoying for callers.
     */
    JS_ASSERT(plength);
    AssertHeapIsIdleOrStringIsFlat(cx, str);
    CHECK_REQUEST(cx);
    JSFlatString *flat = str->ensureFlat(cx);
    if (!flat)
        return NULL;
    *plength = flat->length();
    return flat->chars();
}

JS_PUBLIC_API(const jschar *)
JS_GetStringCharsAndLength(JSContext *cx, JSString *str, size_t *plength)
{
    JS_ASSERT(plength);
    AssertHeapIsIdleOrStringIsFlat(cx, str);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, str);
    JSLinearString *linear = str->ensureLinear(cx);
    if (!linear)
        return NULL;
    *plength = linear->length();
    return linear->chars();
}

JS_PUBLIC_API(const jschar *)
JS_GetInternedStringChars(JSString *str)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JS_ASSERT(str->isAtom());
    JSFlatString *flat = str->ensureFlat(NULL);
    if (!flat)
        return NULL;
    return flat->chars();
}

JS_PUBLIC_API(const jschar *)
JS_GetInternedStringCharsAndLength(JSString *str, size_t *plength)
{
    JS_ASSERT(str->isAtom());
    JS_ASSERT(plength);
    JSFlatString *flat = str->ensureFlat(NULL);
    if (!flat)
        return NULL;
    *plength = flat->length();
    return flat->chars();
}

extern JS_PUBLIC_API(JSFlatString *)
JS_FlattenString(JSContext *cx, JSString *str)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, str);
    JSFlatString *flat = str->ensureFlat(cx);
    if (!flat)
        return NULL;
    return flat;
}

extern JS_PUBLIC_API(const jschar *)
JS_GetFlatStringChars(JSFlatString *str)
{
    return str->chars();
}

JS_PUBLIC_API(JSBool)
JS_CompareStrings(JSContext *cx, JSString *str1, JSString *str2, int32_t *result)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    return CompareStrings(cx, str1, str2, result);
}

JS_PUBLIC_API(JSBool)
JS_StringEqualsAscii(JSContext *cx, JSString *str, const char *asciiBytes, JSBool *match)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    JSLinearString *linearStr = str->ensureLinear(cx);
    if (!linearStr)
        return false;
    *match = StringEqualsAscii(linearStr, asciiBytes);
    return true;
}

JS_PUBLIC_API(JSBool)
JS_FlatStringEqualsAscii(JSFlatString *str, const char *asciiBytes)
{
    return StringEqualsAscii(str, asciiBytes);
}

JS_PUBLIC_API(size_t)
JS_PutEscapedFlatString(char *buffer, size_t size, JSFlatString *str, char quote)
{
    return PutEscapedString(buffer, size, str, quote);
}

JS_PUBLIC_API(size_t)
JS_PutEscapedString(JSContext *cx, char *buffer, size_t size, JSString *str, char quote)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    JSLinearString *linearStr = str->ensureLinear(cx);
    if (!linearStr)
        return size_t(-1);
    return PutEscapedString(buffer, size, linearStr, quote);
}

JS_PUBLIC_API(JSBool)
JS_FileEscapedString(FILE *fp, JSString *str, char quote)
{
    TRACK_MEMORY_SCOPE("Javascript");
    JSLinearString *linearStr = str->ensureLinear(NULL);
    return linearStr && FileEscapedString(fp, linearStr, quote);
}

JS_PUBLIC_API(JSString *)
JS_NewGrowableString(JSContext *cx, jschar *chars, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return js_NewString<CanGC>(cx, chars, length);
}

JS_PUBLIC_API(JSString *)
JS_NewDependentString(JSContext *cx, JSString *str, size_t start, size_t length)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return js_NewDependentString(cx, str, start, length);
}

JS_PUBLIC_API(JSString *)
JS_ConcatStrings(JSContext *cx, JSString *left, JSString *right)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    Rooted<JSString*> lstr(cx, left);
    Rooted<JSString*> rstr(cx, right);
    return ConcatStrings<CanGC>(cx, lstr, rstr);
}

JS_PUBLIC_API(JSBool)
JS_DecodeBytes(JSContext *cx, const char *src, size_t srclen, jschar *dst, size_t *dstlenp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return InflateStringToBuffer(cx, src, srclen, dst, dstlenp);
}

JS_PUBLIC_API(char *)
JS_EncodeString(JSContext *cx, JSString *str)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    JSLinearString *linear = str->ensureLinear(cx);
    if (!linear)
        return NULL;

    return LossyTwoByteCharsToNewLatin1CharsZ(cx, linear->range()).c_str();
}

JS_PUBLIC_API(char *)
JS_EncodeStringToUTF8(JSContext *cx, JSString *str)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    JSLinearString *linear = str->ensureLinear(cx);
    if (!linear)
        return NULL;

    return TwoByteCharsToNewUTF8CharsZ(cx, linear->range()).c_str();
}

JS_PUBLIC_API(size_t)
JS_GetStringEncodingLength(JSContext *cx, JSString *str)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    const jschar *chars = str->getChars(cx);
    if (!chars)
        return size_t(-1);
    return str->length();
}

JS_PUBLIC_API(size_t)
JS_EncodeStringToBuffer(JSContext *cx, JSString *str, char *buffer, size_t length)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    /*
     * FIXME bug 612141 - fix DeflateStringToBuffer interface so the result
     * would allow to distinguish between insufficient buffer and encoding
     * error.
     */
    size_t writtenLength = length;
    const jschar *chars = str->getChars(NULL);
    if (!chars)
        return size_t(-1);
    if (DeflateStringToBuffer(NULL, chars, str->length(), buffer, &writtenLength)) {
        JS_ASSERT(writtenLength <= length);
        return writtenLength;
    }
    JS_ASSERT(writtenLength <= length);
    size_t necessaryLength = str->length();
    if (necessaryLength == size_t(-1))
        return size_t(-1);
    JS_ASSERT(writtenLength == length); // C strings are NOT encoded.
    return necessaryLength;
}

JS_PUBLIC_API(JSBool)
JS_Stringify(JSContext *cx, jsval *vp, JSObject *replacerArg, jsval space,
             JSONWriteCallback callback, void *data)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject replacer(cx, replacerArg);
    RootedValue value(cx, *vp);

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, replacer, space);
    StringBuffer sb(cx);
    if (!js_Stringify(cx, &value, replacer, space, sb))
        return false;
    *vp = value;
    if (sb.empty()) {
        HandlePropertyName null = cx->names().null;
        return callback(null->chars(), null->length(), data);
    }
    return callback(sb.begin(), sb.length(), data);
}

JS_PUBLIC_API(JSBool)
JS_ParseJSON(JSContext *cx, const jschar *chars, uint32_t len, JS::MutableHandleValue vp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RootedValue reviver(cx, NullValue()), value(cx);
    return ParseJSONWithReviver(cx, JS::StableCharPtr(chars, len), len, reviver, vp);
}

JS_PUBLIC_API(JSBool)
JS_ParseJSONWithReviver(JSContext *cx, const jschar *chars, uint32_t len, jsval reviverArg, jsval *vp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RootedValue reviver(cx, reviverArg), value(cx);
    if (!ParseJSONWithReviver(cx, StableCharPtr(chars, len), len, reviver, &value))
        return false;

    *vp = value;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_ReadStructuredClone(JSContext *cx, uint64_t *buf, size_t nbytes,
                       uint32_t version, jsval *vp,
                       const JSStructuredCloneCallbacks *optionalCallbacks,
                       void *closure)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    if (version > JS_STRUCTURED_CLONE_VERSION) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_BAD_CLONE_VERSION);
        return false;
    }
    const JSStructuredCloneCallbacks *callbacks =
        optionalCallbacks ?
        optionalCallbacks :
        cx->runtime()->structuredCloneCallbacks;
    return ReadStructuredClone(cx, buf, nbytes, vp, callbacks, closure);
}

JS_PUBLIC_API(JSBool)
JS_WriteStructuredClone(JSContext *cx, jsval valueArg, uint64_t **bufp, size_t *nbytesp,
                        const JSStructuredCloneCallbacks *optionalCallbacks,
                        void *closure, jsval transferable)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);

    const JSStructuredCloneCallbacks *callbacks =
        optionalCallbacks ?
        optionalCallbacks :
        cx->runtime()->structuredCloneCallbacks;
    return WriteStructuredClone(cx, value, (uint64_t **) bufp, nbytesp,
                                callbacks, closure, transferable);
}

JS_PUBLIC_API(JSBool)
JS_ClearStructuredClone(const uint64_t *data, size_t nbytes)
{
    return ClearStructuredClone(data, nbytes);
}

JS_PUBLIC_API(JSBool)
JS_StructuredCloneHasTransferables(const uint64_t *data, size_t nbytes,
                                   JSBool *hasTransferable)
{
    bool transferable;
    if (!StructuredCloneHasTransferObjects(data, nbytes, &transferable))
        return false;

    *hasTransferable = transferable;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_StructuredClone(JSContext *cx, jsval valueArg, jsval *vp,
                   const JSStructuredCloneCallbacks *optionalCallbacks,
                   void *closure)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);

    const JSStructuredCloneCallbacks *callbacks =
        optionalCallbacks ?
        optionalCallbacks :
        cx->runtime()->structuredCloneCallbacks;
    JSAutoStructuredCloneBuffer buf;
    return buf.write(cx, value, callbacks, closure) &&
           buf.read(cx, vp, callbacks, closure);
}

void
JSAutoStructuredCloneBuffer::clear()
{
    if (data_) {
        ClearStructuredClone(data_, nbytes_);
        data_ = NULL;
        nbytes_ = 0;
        version_ = 0;
    }
}

void
JSAutoStructuredCloneBuffer::adopt(uint64_t *data, size_t nbytes, uint32_t version)
{
    clear();
    data_ = data;
    nbytes_ = nbytes;
    version_ = version;
}

bool
JSAutoStructuredCloneBuffer::copy(const uint64_t *srcData, size_t nbytes, uint32_t version)
{
    // transferable objects cannot be copied
    bool hasTransferable;
    if (!StructuredCloneHasTransferObjects(data_, nbytes_, &hasTransferable) ||
        hasTransferable)
        return false;

    uint64_t *newData = static_cast<uint64_t *>(js_malloc(nbytes));
    if (!newData)
        return false;

    js_memcpy(newData, srcData, nbytes);

    clear();
    data_ = newData;
    nbytes_ = nbytes;
    version_ = version;
    return true;
}
void
JSAutoStructuredCloneBuffer::steal(uint64_t **datap, size_t *nbytesp, uint32_t *versionp)
{
    *datap = data_;
    *nbytesp = nbytes_;
    if (versionp)
        *versionp = version_;

    data_ = NULL;
    nbytes_ = 0;
    version_ = 0;
}

bool
JSAutoStructuredCloneBuffer::read(JSContext *cx, jsval *vp,
                                  const JSStructuredCloneCallbacks *optionalCallbacks,
                                  void *closure)
{
    JS_ASSERT(cx);
    JS_ASSERT(data_);
    return !!JS_ReadStructuredClone(cx, data_, nbytes_, version_, vp,
                                    optionalCallbacks, closure);
}

bool
JSAutoStructuredCloneBuffer::write(JSContext *cx, jsval valueArg,
                                   const JSStructuredCloneCallbacks *optionalCallbacks,
                                   void *closure)
{
    jsval transferable = JSVAL_VOID;
    return write(cx, valueArg, transferable, optionalCallbacks, closure);
}

bool
JSAutoStructuredCloneBuffer::write(JSContext *cx, jsval valueArg,
                                   jsval transferable,
                                   const JSStructuredCloneCallbacks *optionalCallbacks,
                                   void *closure)
{
    RootedValue value(cx, valueArg);
    clear();
    bool ok = !!JS_WriteStructuredClone(cx, value, &data_, &nbytes_,
                                        optionalCallbacks, closure,
                                        transferable);
    if (!ok) {
        data_ = NULL;
        nbytes_ = 0;
        version_ = JS_STRUCTURED_CLONE_VERSION;
    }
    return ok;
}

void
JSAutoStructuredCloneBuffer::swap(JSAutoStructuredCloneBuffer &other)
{
    uint64_t *data = other.data_;
    size_t nbytes = other.nbytes_;
    uint32_t version = other.version_;

    other.data_ = this->data_;
    other.nbytes_ = this->nbytes_;
    other.version_ = this->version_;

    this->data_ = data;
    this->nbytes_ = nbytes;
    this->version_ = version;
}

JS_PUBLIC_API(void)
JS_SetStructuredCloneCallbacks(JSRuntime *rt, const JSStructuredCloneCallbacks *callbacks)
{
    rt->structuredCloneCallbacks = callbacks;
}

JS_PUBLIC_API(JSBool)
JS_ReadUint32Pair(JSStructuredCloneReader *r, uint32_t *p1, uint32_t *p2)
{
    return r->input().readPair((uint32_t *) p1, (uint32_t *) p2);
}

JS_PUBLIC_API(JSBool)
JS_ReadBytes(JSStructuredCloneReader *r, void *p, size_t len)
{
    return r->input().readBytes(p, len);
}

JS_PUBLIC_API(JSBool)
JS_WriteUint32Pair(JSStructuredCloneWriter *w, uint32_t tag, uint32_t data)
{
    return w->output().writePair(tag, data);
}

JS_PUBLIC_API(JSBool)
JS_WriteBytes(JSStructuredCloneWriter *w, const void *p, size_t len)
{
    return w->output().writeBytes(p, len);
}

/************************************************************************/

JS_PUBLIC_API(void)
JS_ReportError(JSContext *cx, const char *format, ...)
{
    va_list ap;

    AssertHeapIsIdle(cx);
    va_start(ap, format);
    js_ReportErrorVA(cx, JSREPORT_ERROR, format, ap);
    va_end(ap);
}

JS_PUBLIC_API(void)
JS_ReportErrorNumber(JSContext *cx, JSErrorCallback errorCallback,
                     void *userRef, const unsigned errorNumber, ...)
{
    va_list ap;
    va_start(ap, errorNumber);
    JS_ReportErrorNumberVA(cx, errorCallback, userRef, errorNumber, ap);
    va_end(ap);
}

JS_PUBLIC_API(void)
JS_ReportErrorNumberVA(JSContext *cx, JSErrorCallback errorCallback,
                       void *userRef, const unsigned errorNumber,
                       va_list ap)
{
    AssertHeapIsIdle(cx);
    js_ReportErrorNumberVA(cx, JSREPORT_ERROR, errorCallback, userRef,
                           errorNumber, ArgumentsAreASCII, ap);
}

JS_PUBLIC_API(void)
JS_ReportErrorNumberUC(JSContext *cx, JSErrorCallback errorCallback,
                       void *userRef, const unsigned errorNumber, ...)
{
    va_list ap;

    AssertHeapIsIdle(cx);
    va_start(ap, errorNumber);
    js_ReportErrorNumberVA(cx, JSREPORT_ERROR, errorCallback, userRef,
                           errorNumber, ArgumentsAreUnicode, ap);
    va_end(ap);
}

JS_PUBLIC_API(void)
JS_ReportErrorNumberUCArray(JSContext *cx, JSErrorCallback errorCallback,
                            void *userRef, const unsigned errorNumber,
                            const jschar **args)
{
    AssertHeapIsIdle(cx);
    js_ReportErrorNumberUCArray(cx, JSREPORT_ERROR, errorCallback, userRef,
                                errorNumber, args);
}

JS_PUBLIC_API(JSBool)
JS_ReportWarning(JSContext *cx, const char *format, ...)
{
    va_list ap;
    JSBool ok;

    AssertHeapIsIdle(cx);
    va_start(ap, format);
    ok = js_ReportErrorVA(cx, JSREPORT_WARNING, format, ap);
    va_end(ap);
    return ok;
}

JS_PUBLIC_API(JSBool)
JS_ReportErrorFlagsAndNumber(JSContext *cx, unsigned flags,
                             JSErrorCallback errorCallback, void *userRef,
                             const unsigned errorNumber, ...)
{
    va_list ap;
    JSBool ok;

    AssertHeapIsIdle(cx);
    va_start(ap, errorNumber);
    ok = js_ReportErrorNumberVA(cx, flags, errorCallback, userRef,
                                errorNumber, ArgumentsAreASCII, ap);
    va_end(ap);
    return ok;
}

JS_PUBLIC_API(JSBool)
JS_ReportErrorFlagsAndNumberUC(JSContext *cx, unsigned flags,
                               JSErrorCallback errorCallback, void *userRef,
                               const unsigned errorNumber, ...)
{
    va_list ap;
    JSBool ok;

    AssertHeapIsIdle(cx);
    va_start(ap, errorNumber);
    ok = js_ReportErrorNumberVA(cx, flags, errorCallback, userRef,
                                errorNumber, ArgumentsAreUnicode, ap);
    va_end(ap);
    return ok;
}

JS_PUBLIC_API(void)
JS_ReportOutOfMemory(JSContext *cx)
{
    js_ReportOutOfMemory(cx);
}

JS_PUBLIC_API(void)
JS_ReportAllocationOverflow(JSContext *cx)
{
    js_ReportAllocationOverflow(cx);
}

JS_PUBLIC_API(JSErrorReporter)
JS_GetErrorReporter(JSContext *cx)
{
    return cx->errorReporter;
}

JS_PUBLIC_API(JSErrorReporter)
JS_SetErrorReporter(JSContext *cx, JSErrorReporter er)
{
    JSErrorReporter older;

    older = cx->errorReporter;
    cx->errorReporter = er;
    return older;
}

/************************************************************************/

/*
 * Dates.
 */
JS_PUBLIC_API(JSObject *)
JS_NewDateObject(JSContext *cx, int year, int mon, int mday, int hour, int min, int sec)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return js_NewDateObject(cx, year, mon, mday, hour, min, sec);
}

JS_PUBLIC_API(JSObject *)
JS_NewDateObjectMsec(JSContext *cx, double msec)
{
    TRACK_MEMORY_SCOPE("Javascript");
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return js_NewDateObjectMsec(cx, msec);
}

JS_PUBLIC_API(JSBool)
JS_ObjectIsDate(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    assertSameCompartment(cx, obj);
    return ObjectClassIs(obj, ESClass_Date, cx);
}

JS_PUBLIC_API(void)
JS_ClearDateCaches(JSContext *cx)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    cx->runtime()->dateTimeInfo.updateTimeZoneAdjustment();
}

/************************************************************************/

/*
 * Regular Expressions.
 */
JS_PUBLIC_API(JSObject *)
JS_NewRegExpObject(JSContext *cx, JSObject *objArg, char *bytes, size_t length, unsigned flags)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    jschar *chars = InflateString(cx, bytes, &length);
    if (!chars)
        return NULL;

    RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics();
    RegExpObject *reobj = RegExpObject::create(cx, res, chars, length,
                                               RegExpFlag(flags), NULL);
    js_free(chars);
    return reobj;
}

JS_PUBLIC_API(JSObject *)
JS_NewUCRegExpObject(JSContext *cx, JSObject *objArg, jschar *chars, size_t length, unsigned flags)
{
    TRACK_MEMORY_SCOPE("Javascript");
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics();
    return RegExpObject::create(cx, res, chars, length,
                                RegExpFlag(flags), NULL);
}

JS_PUBLIC_API(void)
JS_SetRegExpInput(JSContext *cx, JSObject *objArg, JSString *input, JSBool multiline)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, input);

    obj->as<GlobalObject>().getRegExpStatics()->reset(cx, input, !!multiline);
}

JS_PUBLIC_API(void)
JS_ClearRegExpStatics(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JS_ASSERT(obj);

    obj->as<GlobalObject>().getRegExpStatics()->clear();
}

JS_PUBLIC_API(JSBool)
JS_ExecuteRegExp(JSContext *cx, JSObject *objArg, JSObject *reobjArg, jschar *chars, size_t length,
                 size_t *indexp, JSBool test, jsval *rval)
{
    RootedObject obj(cx, objArg);
    RootedObject reobj(cx, reobjArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics();

    RootedValue val(cx);
    if (!ExecuteRegExpLegacy(cx, res, reobj->as<RegExpObject>(), NullPtr(), chars, length, indexp,
                             test, &val))
    {
        return false;
    }
    *rval = val;
    return true;
}

JS_PUBLIC_API(JSObject *)
JS_NewRegExpObjectNoStatics(JSContext *cx, char *bytes, size_t length, unsigned flags)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    jschar *chars = InflateString(cx, bytes, &length);
    if (!chars)
        return NULL;
    RegExpObject *reobj = RegExpObject::createNoStatics(cx, chars, length,
                                                        RegExpFlag(flags), NULL);
    js_free(chars);
    return reobj;
}

JS_PUBLIC_API(JSObject *)
JS_NewUCRegExpObjectNoStatics(JSContext *cx, jschar *chars, size_t length, unsigned flags)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return RegExpObject::createNoStatics(cx, chars, length,
                                         RegExpFlag(flags), NULL);
}

JS_PUBLIC_API(JSBool)
JS_ExecuteRegExpNoStatics(JSContext *cx, JSObject *objArg, jschar *chars, size_t length,
                          size_t *indexp, JSBool test, jsval *rval)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RootedValue val(cx);
    if (!ExecuteRegExpLegacy(cx, NULL, obj->as<RegExpObject>(), NullPtr(), chars, length, indexp,
                             test, &val))
    {
        return false;
    }
    *rval = val;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_ObjectIsRegExp(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    assertSameCompartment(cx, obj);
    return ObjectClassIs(obj, ESClass_RegExp, cx);
}

JS_PUBLIC_API(unsigned)
JS_GetRegExpFlags(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    return obj->as<RegExpObject>().getFlags();
}

JS_PUBLIC_API(JSString *)
JS_GetRegExpSource(JSContext *cx, JSObject *objArg)
{
    RootedObject obj(cx, objArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    return obj->as<RegExpObject>().getSource();
}

/************************************************************************/

JS_PUBLIC_API(JSBool)
JS_SetDefaultLocale(JSRuntime *rt, const char *locale)
{
    AssertHeapIsIdle(rt);
    return rt->setDefaultLocale(locale);
}

JS_PUBLIC_API(void)
JS_ResetDefaultLocale(JSRuntime *rt)
{
    AssertHeapIsIdle(rt);
    rt->resetDefaultLocale();
}

JS_PUBLIC_API(void)
JS_SetLocaleCallbacks(JSRuntime *rt, JSLocaleCallbacks *callbacks)
{
    AssertHeapIsIdle(rt);
    rt->localeCallbacks = callbacks;
}

JS_PUBLIC_API(JSLocaleCallbacks *)
JS_GetLocaleCallbacks(JSRuntime *rt)
{
    /* This function can be called by a finalizer. */
    return rt->localeCallbacks;
}

/************************************************************************/

JS_PUBLIC_API(JSBool)
JS_IsExceptionPending(JSContext *cx)
{
    /* This function can be called by a finalizer. */
    return (JSBool) cx->isExceptionPending();
}

JS_PUBLIC_API(JSBool)
JS_GetPendingException(JSContext *cx, jsval *vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (!cx->isExceptionPending())
        return JS_FALSE;
    *vp = cx->getPendingException();
    assertSameCompartment(cx, *vp);
    return JS_TRUE;
}

JS_PUBLIC_API(void)
JS_SetPendingException(JSContext *cx, jsval valueArg)
{
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    cx->setPendingException(value);
}

JS_PUBLIC_API(void)
JS_ClearPendingException(JSContext *cx)
{
    AssertHeapIsIdle(cx);
    cx->clearPendingException();
}

JS_PUBLIC_API(JSBool)
JS_ReportPendingException(JSContext *cx)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    return js_ReportUncaughtException(cx);
}

struct JSExceptionState {
    bool throwing;
    jsval exception;
};

JS_PUBLIC_API(JSExceptionState *)
JS_SaveExceptionState(JSContext *cx)
{
    JSExceptionState *state;

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    state = cx->pod_malloc<JSExceptionState>();
    if (state) {
        state->throwing = JS_GetPendingException(cx, &state->exception);
        if (state->throwing && JSVAL_IS_GCTHING(state->exception))
            AddValueRoot(cx, &state->exception, "JSExceptionState.exception");
    }
    return state;
}

JS_PUBLIC_API(void)
JS_RestoreExceptionState(JSContext *cx, JSExceptionState *state)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (state) {
        if (state->throwing)
            JS_SetPendingException(cx, state->exception);
        else
            JS_ClearPendingException(cx);
        JS_DropExceptionState(cx, state);
    }
}

JS_PUBLIC_API(void)
JS_DropExceptionState(JSContext *cx, JSExceptionState *state)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (state) {
        if (state->throwing && JSVAL_IS_GCTHING(state->exception)) {
            assertSameCompartment(cx, state->exception);
            JS_RemoveValueRoot(cx, &state->exception);
        }
        js_free(state);
    }
}

JS_PUBLIC_API(JSErrorReport *)
JS_ErrorFromException(JSContext *cx, jsval valueArg)
{
    RootedValue value(cx, valueArg);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    return js_ErrorFromException(value);
}

JS_PUBLIC_API(JSBool)
JS_ThrowReportedError(JSContext *cx, const char *message,
                      JSErrorReport *reportp)
{
    AssertHeapIsIdle(cx);
    return JS_IsRunning(cx) &&
           js_ErrorToException(cx, message, reportp, NULL, NULL);
}

JS_PUBLIC_API(JSBool)
JS_ThrowStopIteration(JSContext *cx)
{
    AssertHeapIsIdle(cx);
    return js_ThrowStopIteration(cx);
}

JS_PUBLIC_API(intptr_t)
JS_GetCurrentThread()
{
#ifdef JS_THREADSAFE
    return reinterpret_cast<intptr_t>(PR_GetCurrentThread());
#else
    return 0;
#endif
}

extern JS_PUBLIC_API(void)
JS_ClearRuntimeThread(JSRuntime *rt)
{
    AssertHeapIsIdle(rt);
#ifdef JS_THREADSAFE
    rt->clearOwnerThread();
#endif
}

extern JS_PUBLIC_API(void)
JS_SetRuntimeThread(JSRuntime *rt)
{
    AssertHeapIsIdle(rt);
#ifdef JS_THREADSAFE
    rt->setOwnerThread();
#endif
}

extern JS_NEVER_INLINE JS_PUBLIC_API(void)
JS_AbortIfWrongThread(JSRuntime *rt)
{
    rt->abortIfWrongThread();
}

#ifdef JS_GC_ZEAL
JS_PUBLIC_API(void)
JS_SetGCZeal(JSContext *cx, uint8_t zeal, uint32_t frequency)
{
    SetGCZeal(cx->runtime(), zeal, frequency);
}

JS_PUBLIC_API(void)
JS_ScheduleGC(JSContext *cx, uint32_t count)
{
    cx->runtime()->gcNextScheduled = count;
}
#endif

JS_PUBLIC_API(void)
JS_SetParallelCompilationEnabled(JSContext *cx, bool enabled)
{
#ifdef JS_ION
    jit::js_IonOptions.parallelCompilation = enabled;
#endif
}

JS_PUBLIC_API(void)
JS_SetGlobalCompilerOption(JSContext *cx, JSCompilerOption opt, uint32_t value)
{
#ifdef JS_ION
    jit::IonOptions defaultValues;

    switch (opt) {
      case JSCOMPILER_BASELINE_USECOUNT_TRIGGER:
        if (value == uint32_t(-1))
            value = defaultValues.baselineUsesBeforeCompile;
        jit::js_IonOptions.baselineUsesBeforeCompile = value;
        break;
      case JSCOMPILER_ION_USECOUNT_TRIGGER:
        if (value == uint32_t(-1))
            value = defaultValues.usesBeforeCompile;
        jit::js_IonOptions.usesBeforeCompile = value;
        jit::js_IonOptions.eagerCompilation = (value == 0);
        break;
      case JSCOMPILER_PJS_ENABLE:
        if (value == uint32_t(-1))
            value = uint32_t(defaultValues.parallelCompilation);
        jit::js_IonOptions.parallelCompilation = bool(value);
        break;
    }
#endif
}

/************************************************************************/

#if !defined(STATIC_EXPORTABLE_JS_API) && !defined(STATIC_JS_API) && defined(XP_WIN)

#include "jswin.h"

/*
 * Initialization routine for the JS DLL.
 */
BOOL WINAPI DllMain (HINSTANCE hDLL, DWORD dwReason, LPVOID lpReserved)
{
    return TRUE;
}

#endif

JS_PUBLIC_API(JSBool)
JS_IndexToId(JSContext *cx, uint32_t index, jsid *idp)
{
    RootedId id(cx);
    if (!IndexToId(cx, index, &id))
        return false;
    *idp = id;
    return true;
}

JS_PUBLIC_API(JSBool)
JS_CharsToId(JSContext* cx, JS::TwoByteChars chars, jsid *idp)
{
    RootedAtom atom(cx, AtomizeChars<CanGC>(cx, chars.start().get(), chars.length()));
    if (!atom)
        return false;
#ifdef DEBUG
    uint32_t dummy;
    MOZ_ASSERT(!atom->isIndex(&dummy), "API misuse: |chars| must not encode an index");
#endif
    *idp = AtomToId(atom);
    return true;
}

JS_PUBLIC_API(JSBool)
JS_IsIdentifier(JSContext *cx, JSString *str, JSBool *isIdentifier)
{
    assertSameCompartment(cx, str);

    JSLinearString* linearStr = str->ensureLinear(cx);
    if (!linearStr)
        return false;

    *isIdentifier = js::frontend::IsIdentifier(linearStr);
    return true;
}

JS_PUBLIC_API(JSBool)
JS_DescribeScriptedCaller(JSContext *cx, JSScript **script, unsigned *lineno)
{
    if (script)
        *script = NULL;
    if (lineno)
        *lineno = 0;

    NonBuiltinScriptFrameIter i(cx);
    if (i.done())
        return JS_FALSE;

    if (script)
        *script = i.script();
    if (lineno)
        *lineno = js::PCToLineNumber(i.script(), i.pc());
    return JS_TRUE;
}

#ifdef JS_THREADSAFE
static PRStatus
CallOnce(void *func)
{
    JSInitCallback init = JS_DATA_TO_FUNC_PTR(JSInitCallback, func);
    return init() ? PR_SUCCESS : PR_FAILURE;
}
#endif

JS_PUBLIC_API(JSBool)
JS_CallOnce(JSCallOnceType *once, JSInitCallback func)
{
#ifdef JS_THREADSAFE
    return PR_CallOnceWithArg(once, CallOnce, JS_FUNC_TO_DATA_PTR(void *, func)) == PR_SUCCESS;
#else
    if (!*once) {
        *once = true;
        return func();
    } else {
        return JS_TRUE;
    }
#endif
}

AutoGCRooter::AutoGCRooter(JSContext *cx, ptrdiff_t tag)
  : down(cx->runtime()->autoGCRooters), tag_(tag), stackTop(&cx->runtime()->autoGCRooters)
{
    JS_ASSERT(this != *stackTop);
    *stackTop = this;
}

#ifdef DEBUG
JS_PUBLIC_API(void)
JS::AssertArgumentsAreSane(JSContext *cx, const JS::Value &value)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
}
#endif /* DEBUG */

JS_PUBLIC_API(void *)
JS_EncodeScript(JSContext *cx, JSScript *scriptArg, uint32_t *lengthp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    XDREncoder encoder(cx);
    RootedScript script(cx, scriptArg);
    if (!encoder.codeScript(&script))
        return NULL;
    return encoder.forgetData(lengthp);
}

JS_PUBLIC_API(void *)
JS_EncodeInterpretedFunction(JSContext *cx, JSObject *funobjArg, uint32_t *lengthp)
{
    TRACK_MEMORY_SCOPE("Javascript");
    XDREncoder encoder(cx);
    RootedObject funobj(cx, funobjArg);
    if (!encoder.codeFunction(&funobj))
        return NULL;
    return encoder.forgetData(lengthp);
}

JS_PUBLIC_API(JSScript *)
JS_DecodeScript(JSContext *cx, const void *data, uint32_t length,
                JSPrincipals *principals, JSPrincipals *originPrincipals)
{
    TRACK_MEMORY_SCOPE("Javascript");
    XDRDecoder decoder(cx, data, length, principals, originPrincipals);
    RootedScript script(cx);
    if (!decoder.codeScript(&script))
        return NULL;
    return script;
}

JS_PUBLIC_API(JSObject *)
JS_DecodeInterpretedFunction(JSContext *cx, const void *data, uint32_t length,
                             JSPrincipals *principals, JSPrincipals *originPrincipals)
{
    TRACK_MEMORY_SCOPE("Javascript");
    XDRDecoder decoder(cx, data, length, principals, originPrincipals);
    RootedObject funobj(cx);
    if (!decoder.codeFunction(&funobj))
        return NULL;
    return funobj;
}

JS_PUBLIC_API(JSObject *)
JS_GetScriptedGlobal(JSContext *cx)
{
    ScriptFrameIter i(cx);
    if (i.done())
        return cx->global();
    return &i.scopeChain()->global();
}

JS_PUBLIC_API(JSBool)
JS_PreventExtensions(JSContext *cx, JS::HandleObject obj)
{
    if (!JS_IsExtensible(obj))
        return JS_TRUE;

    return JSObject::preventExtensions(cx, obj);
}