src/third_party/mozjs-45/js/src/jsapi.cpp

/* -*- 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/UniquePtr.h"

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

#include "jsarray.h"
#include "jsatom.h"
#include "jsbool.h"
#include "jscntxt.h"
#include "jsdate.h"
#include "jsexn.h"
#include "jsfriendapi.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsiter.h"
#include "jslock.h"
#include "jsmath.h"
#include "jsnum.h"
#include "jsobj.h"
#include "json.h"
#include "jsprf.h"
#include "jsscript.h"
#include "jsstr.h"
#include "jstypes.h"
#include "jsutil.h"
#include "jswatchpoint.h"
#include "jsweakmap.h"
#include "jswrapper.h"

#include "asmjs/AsmJSLink.h"
#include "builtin/AtomicsObject.h"
#include "builtin/Eval.h"
#include "builtin/Intl.h"
#include "builtin/MapObject.h"
#include "builtin/RegExp.h"
#include "builtin/SymbolObject.h"
#ifdef ENABLE_BINARYDATA
#include "builtin/SIMD.h"
#include "builtin/TypedObject.h"
#endif
#include "frontend/BytecodeCompiler.h"
#include "frontend/FullParseHandler.h"  // for JS_BufferIsCompileableUnit
#include "frontend/Parser.h" // for JS_BufferIsCompileableUnit
#include "gc/Marking.h"
#include "jit/JitCommon.h"
#include "js/CharacterEncoding.h"
#include "js/Conversions.h"
#include "js/Date.h"
#include "js/Initialization.h"
#include "js/Proxy.h"
#include "js/SliceBudget.h"
#include "js/StructuredClone.h"
#include "vm/DateObject.h"
#include "vm/Debugger.h"
#include "vm/ErrorObject.h"
#include "vm/HelperThreads.h"
#include "vm/Interpreter.h"
#include "vm/RegExpStatics.h"
#include "vm/Runtime.h"
#include "vm/SavedStacks.h"
#include "vm/ScopeObject.h"
#include "vm/Shape.h"
#include "vm/StopIterationObject.h"
#include "vm/StringBuffer.h"
#include "vm/Symbol.h"
#include "vm/TypedArrayCommon.h"
#include "vm/WrapperObject.h"
#include "vm/Xdr.h"

#include "jsatominlines.h"
#include "jsfuninlines.h"
#include "jsscriptinlines.h"

#include "vm/Interpreter-inl.h"
#include "vm/NativeObject-inl.h"
#include "vm/SavedStacks-inl.h"
#include "vm/String-inl.h"

using namespace js;
using namespace js::gc;

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

using JS::AutoGCRooter;
using JS::ToInt32;
using JS::ToInteger;
using JS::ToUint32;

using js::frontend::Parser;

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

bool
JS::CallArgs::requireAtLeast(JSContext* cx, const char* fnname, unsigned required) const
{
    if (length() < required) {
        char numArgsStr[40];
        JS_snprintf(numArgsStr, sizeof numArgsStr, "%u", required - 1);
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
                             fnname, numArgsStr, required == 2 ? "" : "s");
        return false;
    }

    return true;
}

static bool
ErrorTakesArguments(unsigned msg)
{
    MOZ_ASSERT(msg < JSErr_Limit);
    unsigned argCount = js_ErrorFormatString[msg].argCount;
    MOZ_ASSERT(argCount <= 2);
    return argCount == 1 || argCount == 2;
}

static bool
ErrorTakesObjectArgument(unsigned msg)
{
    MOZ_ASSERT(msg < JSErr_Limit);
    unsigned argCount = js_ErrorFormatString[msg].argCount;
    MOZ_ASSERT(argCount <= 2);
    return argCount == 2;
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::reportStrictErrorOrWarning(JSContext* cx, HandleObject obj, HandleId id,
                                               bool strict)
{
    static_assert(unsigned(OkCode) == unsigned(JSMSG_NOT_AN_ERROR),
                  "unsigned value of OkCode must not be an error code");
    MOZ_ASSERT(code_ != Uninitialized);
    MOZ_ASSERT(!ok());

    unsigned flags = strict ? JSREPORT_ERROR : (JSREPORT_WARNING | JSREPORT_STRICT);
    if (code_ == JSMSG_OBJECT_NOT_EXTENSIBLE || code_ == JSMSG_SET_NON_OBJECT_RECEIVER) {
        RootedValue val(cx, ObjectValue(*obj));
        return ReportValueErrorFlags(cx, flags, code_, JSDVG_IGNORE_STACK, val,
                                     nullptr, nullptr, nullptr);
    }
    if (ErrorTakesArguments(code_)) {
        RootedValue idv(cx, IdToValue(id));
        RootedString str(cx, ValueToSource(cx, idv));
        if (!str)
            return false;

        JSAutoByteString propName(cx, str);
        if (!propName)
            return false;

        if (ErrorTakesObjectArgument(code_)) {
            return JS_ReportErrorFlagsAndNumber(cx, flags, GetErrorMessage, nullptr, code_,
                                                obj->getClass()->name, propName.ptr());
        }

        return JS_ReportErrorFlagsAndNumber(cx, flags, GetErrorMessage, nullptr, code_,
                                            propName.ptr());
    }
    return JS_ReportErrorFlagsAndNumber(cx, flags, GetErrorMessage, nullptr, code_);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::reportStrictErrorOrWarning(JSContext* cx, HandleObject obj, bool strict)
{
    MOZ_ASSERT(code_ != Uninitialized);
    MOZ_ASSERT(!ok());
    MOZ_ASSERT(!ErrorTakesArguments(code_));

    unsigned flags = strict ? JSREPORT_ERROR : (JSREPORT_WARNING | JSREPORT_STRICT);
    return JS_ReportErrorFlagsAndNumber(cx, flags, GetErrorMessage, nullptr, code_);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failCantRedefineProp()
{
    return fail(JSMSG_CANT_REDEFINE_PROP);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failReadOnly()
{
    return fail(JSMSG_READ_ONLY);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failGetterOnly()
{
    return fail(JSMSG_GETTER_ONLY);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failCantDelete()
{
    return fail(JSMSG_CANT_DELETE);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failCantSetInterposed()
{
    return fail(JSMSG_CANT_SET_INTERPOSED);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failCantDefineWindowElement()
{
    return fail(JSMSG_CANT_DEFINE_WINDOW_ELEMENT);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failCantDeleteWindowElement()
{
    return fail(JSMSG_CANT_DELETE_WINDOW_ELEMENT);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failCantDeleteWindowNamedProperty()
{
    return fail(JSMSG_CANT_DELETE_WINDOW_NAMED_PROPERTY);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failCantPreventExtensions()
{
    return fail(JSMSG_CANT_PREVENT_EXTENSIONS);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failCantSetProto()
{
    return fail(JSMSG_CANT_SET_PROTO);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failNoNamedSetter()
{
    return fail(JSMSG_NO_NAMED_SETTER);
}

JS_PUBLIC_API(bool)
JS::ObjectOpResult::failNoIndexedSetter()
{
    return fail(JSMSG_NO_INDEXED_SETTER);
}

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

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

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

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

JS_PUBLIC_API(Value)
JS_GetEmptyStringValue(JSContext* cx)
{
    return StringValue(cx->runtime()->emptyString);
}

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

namespace js {

void
AssertHeapIsIdle(JSRuntime* rt)
{
    MOZ_ASSERT(!rt->isHeapBusy());
}

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

} // namespace js

static void
AssertHeapIsIdleOrIterating(JSRuntime* rt)
{
    MOZ_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.
     */
    MOZ_ASSERT_IF(cx->runtime()->isHeapBusy(), str->isFlat());
}

JS_PUBLIC_API(bool)
JS_ValueToObject(JSContext* cx, HandleValue value, MutableHandleObject objp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    if (value.isNullOrUndefined()) {
        objp.set(nullptr);
        return true;
    }
    JSObject* obj = ToObject(cx, value);
    if (!obj)
        return false;
    objp.set(obj);
    return true;
}

JS_PUBLIC_API(JSFunction*)
JS_ValueToFunction(JSContext* cx, HandleValue value)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    return ReportIfNotFunction(cx, value);
}

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

JS_PUBLIC_API(JSString*)
JS_ValueToSource(JSContext* cx, HandleValue value)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    return ValueToSource(cx, value);
}

JS_PUBLIC_API(bool)
JS_DoubleIsInt32(double d, int32_t* ip)
{
    return mozilla::NumberIsInt32(d, ip);
}

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

JS_PUBLIC_API(bool)
JS_StrictlyEqual(JSContext* cx, HandleValue value1, HandleValue value2, bool* equal)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value1, value2);
    MOZ_ASSERT(equal);
    return StrictlyEqual(cx, value1, value2, equal);
}

JS_PUBLIC_API(bool)
JS_LooselyEqual(JSContext* cx, HandleValue value1, HandleValue value2, bool* equal)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value1, value2);
    MOZ_ASSERT(equal);
    return LooselyEqual(cx, value1, value2, equal);
}

JS_PUBLIC_API(bool)
JS_SameValue(JSContext* cx, HandleValue value1, HandleValue value2, bool* same)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value1, value2);
    MOZ_ASSERT(same);
    return SameValue(cx, value1, value2, same);
}

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

JS_PUBLIC_API(bool)
JS_IsBuiltinFunctionConstructor(JSFunction* fun)
{
    return fun->isBuiltinFunctionConstructor();
}

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

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

JS_PUBLIC_API(JSRuntime*)
JS_NewRuntime(uint32_t maxbytes, uint32_t maxNurseryBytes, JSRuntime* parentRuntime)
{
    MOZ_ASSERT(JS::detail::libraryInitState == JS::detail::InitState::Running,
               "must call JS_Init prior to creating any JSRuntimes");

    // Make sure that all parent runtimes are the topmost parent.
    while (parentRuntime && parentRuntime->parentRuntime)
        parentRuntime = parentRuntime->parentRuntime;

    JSRuntime* rt = js_new<JSRuntime>(parentRuntime);
    if (!rt)
        return nullptr;

    if (!rt->init(maxbytes, maxNurseryBytes)) {
        JS_DestroyRuntime(rt);
        return nullptr;
    }

    return rt;
}

JS_PUBLIC_API(void)
JS_DestroyRuntime(JSRuntime* rt)
{
    js_delete(rt);
}

static JS_CurrentEmbedderTimeFunction currentEmbedderTimeFunction;

JS_PUBLIC_API(void)
JS_SetCurrentEmbedderTimeFunction(JS_CurrentEmbedderTimeFunction timeFn)
{
    currentEmbedderTimeFunction = timeFn;
}

JS_PUBLIC_API(double)
JS_GetCurrentEmbedderTime()
{
    if (currentEmbedderTimeFunction)
        return currentEmbedderTimeFunction();
    return PRMJ_Now() / static_cast<double>(PRMJ_USEC_PER_MSEC);
}

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

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

static void
StartRequest(JSContext* cx)
{
    JSRuntime* rt = cx->runtime();
    MOZ_ASSERT(CurrentThreadCanAccessRuntime(rt));

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

static void
StopRequest(JSContext* cx)
{
    JSRuntime* rt = cx->runtime();
    MOZ_ASSERT(CurrentThreadCanAccessRuntime(rt));

    MOZ_ASSERT(rt->requestDepth != 0);
    if (rt->requestDepth != 1) {
        rt->requestDepth--;
    } else {
        rt->requestDepth = 0;
        rt->triggerActivityCallback(false);
    }
}

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

JS_PUBLIC_API(void)
JS_EndRequest(JSContext* cx)
{
    MOZ_ASSERT(cx->outstandingRequests != 0);
    cx->outstandingRequests--;
    StopRequest(cx);
}

JS_PUBLIC_API(void)
JS_SetContextCallback(JSRuntime* rt, JSContextCallback cxCallback, void* data)
{
    rt->cxCallback = cxCallback;
    rt->cxCallbackData = data;
}

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

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

JS_PUBLIC_API(void)
JS_DestroyContextNoGC(JSContext* cx)
{
    MOZ_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(JSRuntime*)
JS_GetParentRuntime(JSContext* cx)
{
    JSRuntime* rt = cx->runtime();
    return rt->parentRuntime ? rt->parentRuntime : rt;
}

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 const 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, nullptr},          /* must be last, nullptr 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(JS::RuntimeOptions&)
JS::RuntimeOptionsRef(JSRuntime* rt)
{
    return rt->options();
}

JS_PUBLIC_API(JS::RuntimeOptions&)
JS::RuntimeOptionsRef(JSContext* cx)
{
    return cx->runtime()->options();
}

JS_PUBLIC_API(JS::ContextOptions&)
JS::ContextOptionsRef(JSContext* cx)
{
    return cx->options();
}

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(void)
JS_SetWrapObjectCallbacks(JSRuntime* rt, const JSWrapObjectCallbacks* callbacks)
{
    rt->wrapObjectCallbacks = callbacks;
}

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

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

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


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

JSAutoNullableCompartment::JSAutoNullableCompartment(JSContext* cx,
                                                     JSObject* targetOrNull
                                                     MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
  : cx_(cx),
    oldCompartment_(cx->compartment())
{
    AssertHeapIsIdleOrIterating(cx_);
    MOZ_GUARD_OBJECT_NOTIFIER_INIT;
    if (targetOrNull) {
        cx_->enterCompartment(targetOrNull->compartment());
    } else {
        cx_->enterNullCompartment();
    }
}

JSAutoNullableCompartment::~JSAutoNullableCompartment()
{
    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(JSAddonId*)
JS::NewAddonId(JSContext* cx, HandleString str)
{
    return static_cast<JSAddonId*>(JS_AtomizeAndPinJSString(cx, str));
}

JS_PUBLIC_API(JSString*)
JS::StringOfAddonId(JSAddonId* id)
{
    return id;
}

JS_PUBLIC_API(JSAddonId*)
JS::AddonIdOfObject(JSObject* obj)
{
    return obj->compartment()->addonId;
}

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(bool)
JS_WrapObject(JSContext* cx, MutableHandleObject objp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (objp)
        JS::ExposeObjectToActiveJS(objp);
    return cx->compartment()->wrap(cx, objp);
}

JS_PUBLIC_API(bool)
JS_WrapValue(JSContext* cx, MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JS::ExposeValueToActiveJS(vp);
    return cx->compartment()->wrap(cx, vp);
}

/*
 * 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)
{
    AssertHeapIsIdle(cx);
    MOZ_ASSERT(origobj != target);
    MOZ_ASSERT(!origobj->is<CrossCompartmentWrapperObject>());
    MOZ_ASSERT(!target->is<CrossCompartmentWrapperObject>());

    RootedValue origv(cx, ObjectValue(*origobj));
    RootedObject newIdentity(cx);

    {
        AutoDisableProxyCheck adpc(cx->runtime());

        JSCompartment* destination = target->compartment();

        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().get().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))
                MOZ_CRASH();
            MOZ_ASSERT(Wrapper::wrappedObject(newIdentityWrapper) == newIdentity);
            if (!JSObject::swap(cx, origobj, newIdentityWrapper))
                MOZ_CRASH();
            origobj->compartment()->putWrapper(cx, CrossCompartmentKey(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(bool)
JS_RefreshCrossCompartmentWrappers(JSContext* cx, HandleObject obj)
{
    return RemapAllWrappersForObject(cx, obj, obj);
}

JS_PUBLIC_API(bool)
JS_InitStandardClasses(JSContext* cx, HandleObject obj)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    assertSameCompartment(cx, obj);

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

#define EAGER_ATOM(name)            NAME_OFFSET(name)

typedef struct JSStdName {
    size_t      atomOffset;     /* offset of atom pointer in JSAtomState */
    JSProtoKey  key;
    bool isDummy() const { return key == JSProto_Null; }
    bool isSentinel() const { return key == JSProto_LIMIT; }
} JSStdName;

static const JSStdName*
LookupStdName(const JSAtomState& names, JSAtom* name, const JSStdName* table)
{
    for (unsigned i = 0; !table[i].isSentinel(); i++) {
        if (table[i].isDummy())
            continue;
        JSAtom* atom = AtomStateOffsetToName(names, table[i].atomOffset);
        MOZ_ASSERT(atom);
        if (name == atom)
            return &table[i];
    }

    return nullptr;
}

/*
 * Table of standard classes, indexed by JSProtoKey. For entries where the
 * JSProtoKey does not correspond to a class with a meaningful constructor, we
 * insert a null entry into the table.
 */
#define STD_NAME_ENTRY(name, code, init, clasp) { EAGER_ATOM(name), static_cast<JSProtoKey>(code) },
#define STD_DUMMY_ENTRY(name, code, init, dummy) { 0, JSProto_Null },
static const JSStdName standard_class_names[] = {
  JS_FOR_PROTOTYPES(STD_NAME_ENTRY, STD_DUMMY_ENTRY)
  { 0, JSProto_LIMIT }
};

/*
 * Table of top-level function and constant names and the JSProtoKey of the
 * standard class that initializes them.
 */
static const JSStdName builtin_property_names[] = {
    { EAGER_ATOM(eval), JSProto_Object },

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

    /* String global functions. */
    { EAGER_ATOM(escape), JSProto_String },
    { EAGER_ATOM(unescape), JSProto_String },
    { EAGER_ATOM(decodeURI), JSProto_String },
    { EAGER_ATOM(encodeURI), JSProto_String },
    { EAGER_ATOM(decodeURIComponent), JSProto_String },
    { EAGER_ATOM(encodeURIComponent), JSProto_String },
#if JS_HAS_UNEVAL
    { EAGER_ATOM(uneval), JSProto_String },
#endif
#ifdef ENABLE_BINARYDATA
    { EAGER_ATOM(SIMD), JSProto_SIMD },
    { EAGER_ATOM(TypedObject), JSProto_TypedObject },
#endif
#ifdef ENABLE_SHARED_ARRAY_BUFFER
    { EAGER_ATOM(Atomics), JSProto_Atomics },
#endif

    { 0, JSProto_LIMIT }
};

#undef EAGER_ATOM

JS_PUBLIC_API(bool)
JS_ResolveStandardClass(JSContext* cx, HandleObject obj, HandleId id, bool* resolved)
{
    JSRuntime* rt;
    const JSStdName* stdnm;

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

    Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
    *resolved = false;

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

    /* Check whether we're resolving 'undefined', and define it if so. */
    JSAtom* idAtom = JSID_TO_ATOM(id);
    JSAtom* undefinedAtom = cx->names().undefined;
    if (idAtom == undefinedAtom) {
        *resolved = true;
        return DefineProperty(cx, global, id, UndefinedHandleValue, nullptr, nullptr,
                              JSPROP_PERMANENT | JSPROP_READONLY | JSPROP_RESOLVING);
    }

    /* Try for class constructors/prototypes named by well-known atoms. */
    stdnm = LookupStdName(cx->names(), idAtom, standard_class_names);

    /* Try less frequently used top-level functions and constants. */
    if (!stdnm)
        stdnm = LookupStdName(cx->names(), idAtom, builtin_property_names);

    // If this class is anonymous, then it doesn't exist as a global
    // property, so we won't resolve anything.
    JSProtoKey key = stdnm ? stdnm->key : JSProto_Null;
    if (key != JSProto_Null) {
        const Class* clasp = ProtoKeyToClass(key);
        if (!clasp || !(clasp->flags & JSCLASS_IS_ANONYMOUS)) {
            if (!GlobalObject::ensureConstructor(cx, global, key))
                return false;

            *resolved = true;
            return true;
        }
    }

    // There is no such property to resolve. An ordinary resolve hook would
    // just return true at this point. But the global object is special in one
    // more way: its prototype chain is lazily initialized. That is,
    // global->getProto() might be null right now because we haven't created
    // Object.prototype yet. Force it now.
    if (!global->getOrCreateObjectPrototype(cx))
        return false;

    return true;
}

JS_PUBLIC_API(bool)
JS_MayResolveStandardClass(const JSAtomState& names, jsid id, JSObject* maybeObj)
{
    MOZ_ASSERT_IF(maybeObj, maybeObj->is<GlobalObject>());

    // The global object's resolve hook is special: JS_ResolveStandardClass
    // initializes the prototype chain lazily. Only attempt to optimize here
    // if we know the prototype chain has been initialized.
    if (!maybeObj || !maybeObj->getProto())
        return true;

    if (!JSID_IS_ATOM(id))
        return false;

    JSAtom* atom = JSID_TO_ATOM(id);

    return atom == names.undefined ||
           LookupStdName(names, atom, standard_class_names) ||
           LookupStdName(names, atom, builtin_property_names);
}

JS_PUBLIC_API(bool)
JS_EnumerateStandardClasses(JSContext* cx, HandleObject obj)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    MOZ_ASSERT(obj->is<GlobalObject>());
    Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
    return GlobalObject::initStandardClasses(cx, global);
}

JS_PUBLIC_API(bool)
JS_GetClassObject(JSContext* cx, JSProtoKey key, MutableHandleObject objp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return GetBuiltinConstructor(cx, key, objp);
}

JS_PUBLIC_API(bool)
JS_GetClassPrototype(JSContext* cx, JSProtoKey key, MutableHandleObject objp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return GetBuiltinPrototype(cx, key, objp);
}

namespace JS {

JS_PUBLIC_API(void)
ProtoKeyToId(JSContext* cx, JSProtoKey key, MutableHandleId idp)
{
    idp.set(NameToId(ClassName(key, cx)));
}

} /* namespace JS */

JS_PUBLIC_API(JSProtoKey)
JS_IdToProtoKey(JSContext* cx, HandleId id)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    if (!JSID_IS_ATOM(id))
        return JSProto_Null;

    JSAtom* atom = JSID_TO_ATOM(id);
    const JSStdName* stdnm = LookupStdName(cx->names(), atom, standard_class_names);
    if (!stdnm)
        return JSProto_Null;

    MOZ_ASSERT(MOZ_ARRAY_LENGTH(standard_class_names) == JSProto_LIMIT + 1);
    return static_cast<JSProtoKey>(stdnm - standard_class_names);
}

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

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

JS_PUBLIC_API(JSObject*)
JS_GetArrayPrototype(JSContext* cx, HandleObject forObj)
{
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, forObj);
    Rooted<GlobalObject*> global(cx, &forObj->global());
    return GlobalObject::getOrCreateArrayPrototype(cx, global);
}

JS_PUBLIC_API(JSObject*)
JS_GetErrorPrototype(JSContext* cx)
{
    CHECK_REQUEST(cx);
    Rooted<GlobalObject*> global(cx, cx->global());
    return GlobalObject::getOrCreateCustomErrorPrototype(cx, global, JSEXN_ERR);
}

JS_PUBLIC_API(JSObject*)
JS_GetIteratorPrototype(JSContext* cx)
{
    CHECK_REQUEST(cx);
    Rooted<GlobalObject*> global(cx, cx->global());
    return GlobalObject::getOrCreateIteratorPrototype(cx, global);
}

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

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

extern JS_PUBLIC_API(JSObject*)
JS_GlobalLexicalScope(JSObject* obj)
{
    return &obj->as<GlobalObject>().lexicalScope();
}

extern JS_PUBLIC_API(bool)
JS_HasExtensibleLexicalScope(JSObject* obj)
{
    return obj->is<GlobalObject>() || obj->compartment()->getNonSyntacticLexicalScope(obj);
}

extern JS_PUBLIC_API(JSObject*)
JS_ExtensibleLexicalScope(JSObject* obj)
{
    JSObject* lexical = nullptr;
    if (obj->is<GlobalObject>())
        lexical = JS_GlobalLexicalScope(obj);
    else
        lexical = obj->compartment()->getNonSyntacticLexicalScope(obj);
    MOZ_ASSERT(lexical);
    return lexical;
}

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

JS_PUBLIC_API(JSObject*)
JS::CurrentGlobalOrNull(JSContext* cx)
{
    AssertHeapIsIdleOrIterating(cx);
    CHECK_REQUEST(cx);
    if (!cx->compartment())
        return nullptr;
    return cx->global();
}

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

JS_PUBLIC_API(void*)
JS_malloc(JSContext* cx, size_t nbytes)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return static_cast<void*>(cx->runtime()->pod_malloc<uint8_t>(nbytes));
}

JS_PUBLIC_API(void*)
JS_realloc(JSContext* cx, void* p, size_t oldBytes, size_t newBytes)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return static_cast<void*>(cx->zone()->pod_realloc<uint8_t>(static_cast<uint8_t*>(p), oldBytes,
                                                                newBytes));
}

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);
    return DuplicateString(cx, s).release();
}

JS_PUBLIC_API(char*)
JS_strdup(JSRuntime* rt, const char* s)
{
    AssertHeapIsIdle(rt);
    size_t n = strlen(s) + 1;
    char* p = rt->pod_malloc<char>(n);
    if (!p)
        return nullptr;
    return static_cast<char*>(js_memcpy(p, s, n));
}

#undef JS_AddRoot

JS_PUBLIC_API(bool)
JS_AddExtraGCRootsTracer(JSRuntime* rt, JSTraceDataOp traceOp, void* data)
{
    return rt->gc.addBlackRootsTracer(traceOp, data);
}

JS_PUBLIC_API(void)
JS_RemoveExtraGCRootsTracer(JSRuntime* rt, JSTraceDataOp traceOp, void* data)
{
    return rt->gc.removeBlackRootsTracer(traceOp, data);
}

JS_PUBLIC_API(void)
JS_GC(JSRuntime* rt)
{
    AssertHeapIsIdle(rt);
    JS::PrepareForFullGC(rt);
    rt->gc.gc(GC_NORMAL, JS::gcreason::API);
}

JS_PUBLIC_API(void)
JS_MaybeGC(JSContext* cx)
{
    GCRuntime& gc = cx->runtime()->gc;
    if (!gc.maybeGC(cx->zone()))
        gc.maybePeriodicFullGC();
}

JS_PUBLIC_API(void)
JS_SetGCCallback(JSRuntime* rt, JSGCCallback cb, void* data)
{
    AssertHeapIsIdle(rt);
    rt->gc.setGCCallback(cb, data);
}

JS_PUBLIC_API(bool)
JS_AddFinalizeCallback(JSRuntime* rt, JSFinalizeCallback cb, void* data)
{
    AssertHeapIsIdle(rt);
    return rt->gc.addFinalizeCallback(cb, data);
}

JS_PUBLIC_API(void)
JS_RemoveFinalizeCallback(JSRuntime* rt, JSFinalizeCallback cb)
{
    rt->gc.removeFinalizeCallback(cb);
}

JS_PUBLIC_API(bool)
JS_AddWeakPointerZoneGroupCallback(JSRuntime* rt, JSWeakPointerZoneGroupCallback cb, void* data)
{
    AssertHeapIsIdle(rt);
    return rt->gc.addWeakPointerZoneGroupCallback(cb, data);
}

JS_PUBLIC_API(void)
JS_RemoveWeakPointerZoneGroupCallback(JSRuntime* rt, JSWeakPointerZoneGroupCallback cb)
{
    rt->gc.removeWeakPointerZoneGroupCallback(cb);
}

JS_PUBLIC_API(bool)
JS_AddWeakPointerCompartmentCallback(JSRuntime* rt, JSWeakPointerCompartmentCallback cb,
                                     void* data)
{
    AssertHeapIsIdle(rt);
    return rt->gc.addWeakPointerCompartmentCallback(cb, data);
}

JS_PUBLIC_API(void)
JS_RemoveWeakPointerCompartmentCallback(JSRuntime* rt, JSWeakPointerCompartmentCallback cb)
{
    rt->gc.removeWeakPointerCompartmentCallback(cb);
}


JS_PUBLIC_API(void)
JS_UpdateWeakPointerAfterGC(JS::Heap<JSObject*>* objp)
{
    JS_UpdateWeakPointerAfterGCUnbarriered(objp->unsafeGet());
}

JS_PUBLIC_API(void)
JS_UpdateWeakPointerAfterGCUnbarriered(JSObject** objp)
{
    if (IsAboutToBeFinalizedUnbarriered(objp))
        *objp = nullptr;
}

JS_PUBLIC_API(void)
JS_SetGCParameter(JSRuntime* rt, JSGCParamKey key, uint32_t value)
{
    AutoLockGC lock(rt);
    rt->gc.setParameter(key, value, lock);
}

JS_PUBLIC_API(uint32_t)
JS_GetGCParameter(JSRuntime* rt, JSGCParamKey key)
{
    AutoLockGC lock(rt);
    return rt->gc.getParameter(key, lock);
}

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

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

static const size_t NumGCConfigs = 14;
struct JSGCConfig {
    JSGCParamKey key;
    uint32_t value;
};

JS_PUBLIC_API(void)
JS_SetGCParametersBasedOnAvailableMemory(JSRuntime* rt, uint32_t availMem)
{
    static const JSGCConfig minimal[NumGCConfigs] = {
        {JSGC_MAX_MALLOC_BYTES, 6 * 1024 * 1024},
        {JSGC_SLICE_TIME_BUDGET, 30},
        {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
        {JSGC_HIGH_FREQUENCY_HIGH_LIMIT, 40},
        {JSGC_HIGH_FREQUENCY_LOW_LIMIT, 0},
        {JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX, 300},
        {JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN, 120},
        {JSGC_LOW_FREQUENCY_HEAP_GROWTH, 120},
        {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
        {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
        {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
        {JSGC_ALLOCATION_THRESHOLD, 1},
        {JSGC_DECOMMIT_THRESHOLD, 1},
        {JSGC_MODE, JSGC_MODE_INCREMENTAL}
    };

    const JSGCConfig* config = minimal;
    if (availMem > 512) {
        static const JSGCConfig nominal[NumGCConfigs] = {
            {JSGC_MAX_MALLOC_BYTES, 6 * 1024 * 1024},
            {JSGC_SLICE_TIME_BUDGET, 30},
            {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1000},
            {JSGC_HIGH_FREQUENCY_HIGH_LIMIT, 500},
            {JSGC_HIGH_FREQUENCY_LOW_LIMIT, 100},
            {JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX, 300},
            {JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN, 150},
            {JSGC_LOW_FREQUENCY_HEAP_GROWTH, 150},
            {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
            {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
            {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
            {JSGC_ALLOCATION_THRESHOLD, 30},
            {JSGC_DECOMMIT_THRESHOLD, 32},
            {JSGC_MODE, JSGC_MODE_COMPARTMENT}
        };

        config = nominal;
    }

    for (size_t i = 0; i < NumGCConfigs; i++)
        JS_SetGCParameter(rt, config[i].key, config[i].value);
}


JS_PUBLIC_API(JSString*)
JS_NewExternalString(JSContext* cx, const char16_t* chars, size_t length,
                     const JSStringFinalizer* fin)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JSString* s = JSExternalString::new_(cx, chars, length, fin);
    return s;
}

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

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

static void
SetNativeStackQuotaAndLimit(JSRuntime* rt, StackKind kind, size_t stackSize)
{
    rt->nativeStackQuota[kind] = stackSize;

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

JS_PUBLIC_API(void)
JS_SetNativeStackQuota(JSRuntime* rt, size_t systemCodeStackSize, size_t trustedScriptStackSize,
                       size_t untrustedScriptStackSize)
{
    MOZ_ASSERT(rt->requestDepth == 0);

    if (!trustedScriptStackSize)
        trustedScriptStackSize = systemCodeStackSize;
    else
        MOZ_ASSERT(trustedScriptStackSize < systemCodeStackSize);

    if (!untrustedScriptStackSize)
        untrustedScriptStackSize = trustedScriptStackSize;
    else
        MOZ_ASSERT(untrustedScriptStackSize < trustedScriptStackSize);

    SetNativeStackQuotaAndLimit(rt, StackForSystemCode, systemCodeStackSize);
    SetNativeStackQuotaAndLimit(rt, StackForTrustedScript, trustedScriptStackSize);
    SetNativeStackQuotaAndLimit(rt, StackForUntrustedScript, untrustedScriptStackSize);

    rt->initJitStackLimit();
}

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

JS_PUBLIC_API(bool)
JS_ValueToId(JSContext* cx, HandleValue value, MutableHandleId idp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, value);
    return ValueToId<CanGC>(cx, value, idp);
}

JS_PUBLIC_API(bool)
JS_StringToId(JSContext* cx, HandleString string, MutableHandleId idp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, string);
    RootedValue value(cx, StringValue(string));
    return ValueToId<CanGC>(cx, value, idp);
}

JS_PUBLIC_API(bool)
JS_IdToValue(JSContext* cx, jsid id, MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    vp.set(IdToValue(id));
    assertSameCompartment(cx, vp);
    return true;
}

JS_PUBLIC_API(bool)
JS::ToPrimitive(JSContext* cx, HandleObject obj, JSType hint, MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    MOZ_ASSERT(obj != nullptr);
    MOZ_ASSERT(hint == JSTYPE_VOID || hint == JSTYPE_STRING || hint == JSTYPE_NUMBER);
    vp.setObject(*obj);
    return ToPrimitiveSlow(cx, hint, vp);
}

JS_PUBLIC_API(bool)
JS::GetFirstArgumentAsTypeHint(JSContext* cx, CallArgs args, JSType *result)
{
    if (!args.get(0).isString()) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
                             "Symbol.toPrimitive",
                             "\"string\", \"number\", or \"default\"",
                             InformalValueTypeName(args.get(0)));
        return false;
    }

    RootedString str(cx, args.get(0).toString());
    bool match;

    if (!EqualStrings(cx, str, cx->names().default_, &match))
        return false;
    if (match) {
        *result = JSTYPE_VOID;
        return true;
    }

    if (!EqualStrings(cx, str, cx->names().string, &match))
        return false;
    if (match) {
        *result = JSTYPE_STRING;
        return true;
    }

    if (!EqualStrings(cx, str, cx->names().number, &match))
        return false;
    if (match) {
        *result = JSTYPE_NUMBER;
        return true;
    }

    JSAutoByteString bytes;
    JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
                         "Symbol.toPrimitive",
                         "\"string\", \"number\", or \"default\"",
                         ValueToSourceForError(cx, args.get(0), bytes));
    return false;
}

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

JS_PUBLIC_API(bool)
JS_StrictPropertyStub(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp,
                      ObjectOpResult& result)
{
    return result.succeed();
}

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

JS_PUBLIC_API(bool)
JS_LinkConstructorAndPrototype(JSContext* cx, HandleObject ctor, HandleObject proto)
{
    return LinkConstructorAndPrototype(cx, ctor, proto);
}

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

JS_PUBLIC_API(bool)
JS_InstanceOf(JSContext* cx, HandleObject obj, const JSClass* clasp, CallArgs* args)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
#ifdef DEBUG
    if (args) {
        assertSameCompartment(cx, obj);
        assertSameCompartment(cx, args->thisv(), args->calleev());
    }
#endif
    if (!obj || obj->getJSClass() != clasp) {
        if (args)
            ReportIncompatibleMethod(cx, *args, Valueify(clasp));
        return false;
    }
    return true;
}

JS_PUBLIC_API(bool)
JS_HasInstance(JSContext* cx, HandleObject obj, HandleValue value, bool* bp)
{
    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->as<NativeObject>().getPrivate();
}

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

JS_PUBLIC_API(void*)
JS_GetInstancePrivate(JSContext* cx, HandleObject obj, const JSClass* clasp, CallArgs* args)
{
    if (!JS_InstanceOf(cx, obj, clasp, args))
        return nullptr;
    return obj->as<NativeObject>().getPrivate();
}

JS_PUBLIC_API(JSObject*)
JS_GetConstructor(JSContext* cx, HandleObject proto)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, proto);

    RootedValue cval(cx);
    if (!GetProperty(cx, proto, proto, cx->names().constructor, &cval))
        return nullptr;
    if (!IsFunctionObject(cval)) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NO_CONSTRUCTOR,
                             proto->getClass()->name);
        return nullptr;
    }
    return &cval.toObject();
}

bool
JS::CompartmentOptions::extraWarnings(JSRuntime* rt) const
{
    return extraWarningsOverride_.get(rt->options().extraWarnings());
}

bool
JS::CompartmentOptions::extraWarnings(JSContext* cx) const
{
    return extraWarnings(cx->runtime());
}

JS::CompartmentOptions&
JS::CompartmentOptions::setZone(ZoneSpecifier spec)
{
    zone_.spec = spec;
    return *this;
}

JS::CompartmentOptions&
JS::CompartmentOptions::setSameZoneAs(JSObject* obj)
{
    zone_.pointer = static_cast<void*>(obj->zone());
    return *this;
}

JS::CompartmentOptions&
JS::CompartmentOptionsRef(JSCompartment* compartment)
{
    return compartment->options();
}

JS::CompartmentOptions&
JS::CompartmentOptionsRef(JSObject* obj)
{
    return obj->compartment()->options();
}

JS::CompartmentOptions&
JS::CompartmentOptionsRef(JSContext* cx)
{
    return cx->compartment()->options();
}

JS_PUBLIC_API(JSObject*)
JS_NewGlobalObject(JSContext* cx, const JSClass* clasp, JSPrincipals* principals,
                   JS::OnNewGlobalHookOption hookOption,
                   const JS::CompartmentOptions& options /* = JS::CompartmentOptions() */)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    return GlobalObject::new_(cx, Valueify(clasp), principals, hookOption, options);
}

JS_PUBLIC_API(void)
JS_GlobalObjectTraceHook(JSTracer* trc, JSObject* global)
{
    MOZ_ASSERT(global->is<GlobalObject>());

    // Off thread parsing and compilation tasks create a dummy global which is then
    // merged back into the host compartment. Since it used to be a global, it will still
    // have this trace hook, but it does not have a meaning relative to its new compartment.
    // We can safely skip it.
    if (!global->isOwnGlobal())
        return;

    // Trace the compartment for any GC things that should only stick around if we know the
    // compartment is live.
    global->compartment()->trace(trc);

    JSTraceOp trace = global->compartment()->options().getTrace();
    if (trace)
        trace(trc, global);
}

JS_PUBLIC_API(void)
JS_FireOnNewGlobalObject(JSContext* cx, JS::HandleObject global)
{
    // This hook is infallible, because we don't really want arbitrary script
    // to be able to throw errors during delicate global creation routines.
    // This infallibility will eat OOM and slow script, but if that happens
    // we'll likely run up into them again soon in a fallible context.
    Rooted<js::GlobalObject*> globalObject(cx, &global->as<GlobalObject>());
    Debugger::onNewGlobalObject(cx, globalObject);
}

JS_PUBLIC_API(JSObject*)
JS_NewObject(JSContext* cx, const JSClass* jsclasp)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    const Class* clasp = Valueify(jsclasp);
    if (!clasp)
        clasp = &PlainObject::class_;    /* default class is Object */

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

    return NewObjectWithClassProto(cx, clasp, nullptr);
}

JS_PUBLIC_API(JSObject*)
JS_NewObjectWithGivenProto(JSContext* cx, const JSClass* jsclasp, HandleObject proto)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, proto);

    const Class* clasp = Valueify(jsclasp);
    if (!clasp)
        clasp = &PlainObject::class_;    /* default class is Object */

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

    return NewObjectWithGivenProto(cx, clasp, proto);
}

JS_PUBLIC_API(JSObject*)
JS_NewPlainObject(JSContext* cx)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    return NewBuiltinClassInstance<PlainObject>(cx);
}

JS_PUBLIC_API(JSObject*)
JS_NewObjectForConstructor(JSContext* cx, const JSClass* clasp, const CallArgs& args)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    Value callee = args.calleev();
    assertSameCompartment(cx, callee);
    RootedObject obj(cx, &callee.toObject());
    return CreateThis(cx, Valueify(clasp), obj);
}

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

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


/*** Standard internal methods *******************************************************************/

JS_PUBLIC_API(bool)
JS_GetPrototype(JSContext* cx, HandleObject obj, MutableHandleObject result)
{
    return GetPrototype(cx, obj, result);
}

JS_PUBLIC_API(bool)
JS_SetPrototype(JSContext* cx, HandleObject obj, HandleObject proto)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, proto);

    return SetPrototype(cx, obj, proto);
}

JS_PUBLIC_API(bool)
JS_IsExtensible(JSContext* cx, HandleObject obj, bool* extensible)
{
    return IsExtensible(cx, obj, extensible);
}

JS_PUBLIC_API(bool)
JS_PreventExtensions(JSContext* cx, JS::HandleObject obj, ObjectOpResult& result)
{
    return PreventExtensions(cx, obj, result);
}

JS_PUBLIC_API(bool)
JS_SetImmutablePrototype(JSContext *cx, JS::HandleObject obj, bool *succeeded)
{
    return SetImmutablePrototype(cx, obj, succeeded);
}

JS_PUBLIC_API(bool)
JS_GetOwnPropertyDescriptorById(JSContext* cx, HandleObject obj, HandleId id,
                                MutableHandle<JSPropertyDescriptor> desc)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    return GetOwnPropertyDescriptor(cx, obj, id, desc);
}

JS_PUBLIC_API(bool)
JS_GetOwnPropertyDescriptor(JSContext* cx, HandleObject obj, const char* name,
                            MutableHandle<JSPropertyDescriptor> desc)
{
    JSAtom* atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_GetOwnPropertyDescriptorById(cx, obj, id, desc);
}

JS_PUBLIC_API(bool)
JS_GetOwnUCPropertyDescriptor(JSContext* cx, HandleObject obj, const char16_t* name,
                              MutableHandle<JSPropertyDescriptor> desc)
{
    JSAtom* atom = AtomizeChars(cx, name, js_strlen(name));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_GetOwnPropertyDescriptorById(cx, obj, id, desc);
}

JS_PUBLIC_API(bool)
JS_GetPropertyDescriptorById(JSContext* cx, HandleObject obj, HandleId id,
                             MutableHandle<JSPropertyDescriptor> desc)
{
    return GetPropertyDescriptor(cx, obj, id, desc);
}

JS_PUBLIC_API(bool)
JS_GetPropertyDescriptor(JSContext* cx, HandleObject obj, const char* name,
                         MutableHandle<JSPropertyDescriptor> desc)
{
    JSAtom* atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return atom && JS_GetPropertyDescriptorById(cx, obj, id, desc);
}

static bool
DefinePropertyByDescriptor(JSContext* cx, HandleObject obj, HandleId id,
                           Handle<JSPropertyDescriptor> desc, ObjectOpResult& result)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id, desc);
    return DefineProperty(cx, obj, id, desc.value(), desc.getter(), desc.setter(),
                          desc.attributes(), result);
}

JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id,
                      Handle<JSPropertyDescriptor> desc, ObjectOpResult& result)
{
    return DefinePropertyByDescriptor(cx, obj, id, desc, result);
}

JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id,
                      Handle<JSPropertyDescriptor> desc)
{
    ObjectOpResult result;
    return DefinePropertyByDescriptor(cx, obj, id, desc, result) &&
           result.checkStrict(cx, obj, id);
}

static bool
DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleValue value,
                   const JSNativeWrapper& get, const JSNativeWrapper& set,
                   unsigned attrs, unsigned flags)
{
    JSGetterOp getter = JS_CAST_NATIVE_TO(get.op, JSGetterOp);
    JSSetterOp setter = JS_CAST_NATIVE_TO(set.op, JSSetterOp);

    // 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.
    //
    // But skip doing this if our accessors are the well-known stub
    // accessors, since those are known to be JSGetterOps.  Assert
    // some sanity about it, though.
    MOZ_ASSERT_IF(getter == JS_PropertyStub,
                  setter == JS_StrictPropertyStub || (attrs & JSPROP_PROPOP_ACCESSORS));
    MOZ_ASSERT_IF(setter == JS_StrictPropertyStub,
                  getter == JS_PropertyStub || (attrs & JSPROP_PROPOP_ACCESSORS));

    // If !(attrs & JSPROP_PROPOP_ACCESSORS), then either getter/setter are both
    // possibly-null JSNatives (or possibly-null JSFunction* if JSPROP_GETTER or
    // JSPROP_SETTER is appropriately set), or both are the well-known property
    // stubs.  The subsequent block must handle only the first of these cases,
    // so carefully exclude the latter case.
    if (!(attrs & JSPROP_PROPOP_ACCESSORS) &&
        getter != JS_PropertyStub && setter != JS_StrictPropertyStub)
    {
        RootedAtom atom(cx, JSID_IS_ATOM(id) ? JSID_TO_ATOM(id) : nullptr);
        if (getter && !(attrs & JSPROP_GETTER)) {
            JSFunction* getobj = NewNativeFunction(cx, (Native) getter, 0, atom);
            if (!getobj)
                return false;

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

            getter = JS_DATA_TO_FUNC_PTR(GetterOp, getobj);
            attrs |= JSPROP_GETTER;
        }
        if (setter && !(attrs & JSPROP_SETTER)) {
            // Root just the getter, since the setter is not yet a JSObject.
            AutoRooterGetterSetter getRoot(cx, JSPROP_GETTER, &getter, nullptr);
            JSFunction* setobj = NewNativeFunction(cx, (Native) setter, 1, atom);
            if (!setobj)
                return false;

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

            setter = JS_DATA_TO_FUNC_PTR(SetterOp, setobj);
            attrs |= JSPROP_SETTER;
        }
    } else {
        attrs &= ~JSPROP_PROPOP_ACCESSORS;
    }

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

    // In most places throughout the engine, a property with null getter and
    // not JSPROP_GETTER/SETTER/SHARED has no getter, and the same for setters:
    // it's just a plain old data property. However the JS_Define* APIs use
    // null getter and setter to mean "default to the Class getProperty and
    // setProperty ops".
    if (!(attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
        if (!getter)
            getter = obj->getClass()->getProperty;
        if (!setter)
            setter = obj->getClass()->setProperty;
    }
    if (getter == JS_PropertyStub)
        getter = nullptr;
    if (setter == JS_StrictPropertyStub)
        setter = nullptr;
    return DefineProperty(cx, obj, id, value, getter, setter, attrs);
}

/*
 * Wrapper functions to create wrappers with no corresponding JSJitInfo from API
 * function arguments.
 */
static JSNativeWrapper
NativeOpWrapper(Native native)
{
    JSNativeWrapper ret;
    ret.op = native;
    ret.info = nullptr;
    return ret;
}

JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleValue value,
                      unsigned attrs, Native getter, Native setter)
{
    return DefinePropertyById(cx, obj, id, value,
                              NativeOpWrapper(getter), NativeOpWrapper(setter),
                              attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleObject valueArg,
                      unsigned attrs, Native getter, Native setter)
{
    RootedValue value(cx, ObjectValue(*valueArg));
    return DefinePropertyById(cx, obj, id, value,
                              NativeOpWrapper(getter), NativeOpWrapper(setter),
                              attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleString valueArg,
                      unsigned attrs, Native getter, Native setter)
{
    RootedValue value(cx, StringValue(valueArg));
    return DefinePropertyById(cx, obj, id, value,
                              NativeOpWrapper(getter), NativeOpWrapper(setter),
                              attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, int32_t valueArg,
                      unsigned attrs, Native getter, Native setter)
{
    Value value = Int32Value(valueArg);
    return DefinePropertyById(cx, obj, id, HandleValue::fromMarkedLocation(&value),
                              NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, uint32_t valueArg,
                      unsigned attrs, Native getter, Native setter)
{
    Value value = NumberValue(valueArg);
    return DefinePropertyById(cx, obj, id, HandleValue::fromMarkedLocation(&value),
                              NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, double valueArg,
                      unsigned attrs, Native getter, Native setter)
{
    Value value = NumberValue(valueArg);
    return DefinePropertyById(cx, obj, id, HandleValue::fromMarkedLocation(&value),
                              NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
}

static bool
DefineProperty(JSContext* cx, HandleObject obj, const char* name, HandleValue value,
               const JSNativeWrapper& getter, const JSNativeWrapper& setter,
               unsigned attrs, unsigned flags)
{
    AutoRooterGetterSetter gsRoot(cx, attrs, const_cast<JSNative*>(&getter.op),
                                  const_cast<JSNative*>(&setter.op));

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

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

JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, HandleValue value,
                  unsigned attrs,
                  Native getter /* = nullptr */, Native setter /* = nullptr */)
{
    return DefineProperty(cx, obj, name, value, NativeOpWrapper(getter), NativeOpWrapper(setter),
                          attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, HandleObject valueArg,
                  unsigned attrs,
                  Native getter /* = nullptr */, Native setter /* = nullptr */)
{
    RootedValue value(cx, ObjectValue(*valueArg));
    return DefineProperty(cx, obj, name, value, NativeOpWrapper(getter), NativeOpWrapper(setter),
                          attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, HandleString valueArg,
                  unsigned attrs,
                  Native getter /* = nullptr */, Native setter /* = nullptr */)
{
    RootedValue value(cx, StringValue(valueArg));
    return DefineProperty(cx, obj, name, value, NativeOpWrapper(getter), NativeOpWrapper(setter),
                          attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, int32_t valueArg,
                  unsigned attrs,
                  Native getter /* = nullptr */, Native setter /* = nullptr */)
{
    Value value = Int32Value(valueArg);
    return DefineProperty(cx, obj, name, HandleValue::fromMarkedLocation(&value),
                          NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, uint32_t valueArg,
                  unsigned attrs,
                  Native getter /* = nullptr */, Native setter /* = nullptr */)
{
    Value value = NumberValue(valueArg);
    return DefineProperty(cx, obj, name, HandleValue::fromMarkedLocation(&value),
                          NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, double valueArg,
                  unsigned attrs,
                  Native getter /* = nullptr */, Native setter /* = nullptr */)
{
    Value value = NumberValue(valueArg);
    return DefineProperty(cx, obj, name, HandleValue::fromMarkedLocation(&value),
                          NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
}

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

JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                    Handle<JSPropertyDescriptor> desc,
                    ObjectOpResult& result)
{
    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return DefinePropertyByDescriptor(cx, obj, id, desc, result);
}

JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                    Handle<JSPropertyDescriptor> desc)
{
    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    ObjectOpResult result;
    return DefinePropertyByDescriptor(cx, obj, id, desc, result) &&
           result.checkStrict(cx, obj, id);
}

static bool
DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                 const Value& value_, Native getter, Native setter, unsigned attrs,
                 unsigned flags)
{
    RootedValue value(cx, value_);
    AutoRooterGetterSetter gsRoot(cx, attrs, &getter, &setter);
    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return DefinePropertyById(cx, obj, id, value, NativeOpWrapper(getter), NativeOpWrapper(setter),
                              attrs, flags);
}

JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                    HandleValue value, unsigned attrs, Native getter, Native setter)
{
    return DefineUCProperty(cx, obj, name, namelen, value, getter, setter, attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                    HandleObject valueArg, unsigned attrs, Native getter, Native setter)
{
    RootedValue value(cx, ObjectValue(*valueArg));
    return DefineUCProperty(cx, obj, name, namelen, value, getter, setter, attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                    HandleString valueArg, unsigned attrs, Native getter, Native setter)
{
    RootedValue value(cx, StringValue(valueArg));
    return DefineUCProperty(cx, obj, name, namelen, value, getter, setter, attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                    int32_t valueArg, unsigned attrs, Native getter, Native setter)
{
    Value value = Int32Value(valueArg);
    return DefineUCProperty(cx, obj, name, namelen, HandleValue::fromMarkedLocation(&value),
                            getter, setter, attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                    uint32_t valueArg, unsigned attrs, Native getter, Native setter)
{
    Value value = NumberValue(valueArg);
    return DefineUCProperty(cx, obj, name, namelen, HandleValue::fromMarkedLocation(&value),
                            getter, setter, attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                    double valueArg, unsigned attrs, Native getter, Native setter)
{
    Value value = NumberValue(valueArg);
    return DefineUCProperty(cx, obj, name, namelen, HandleValue::fromMarkedLocation(&value),
                            getter, setter, attrs, 0);
}

static bool
DefineElement(JSContext* cx, HandleObject obj, uint32_t index, HandleValue value,
              unsigned attrs, Native getter, Native setter)
{
    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,
                              NativeOpWrapper(getter), NativeOpWrapper(setter),
                              attrs, 0);
}

JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, HandleValue value,
                 unsigned attrs, Native getter, Native setter)
{
    return DefineElement(cx, obj, index, value, attrs, getter, setter);
}

JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, HandleObject valueArg,
                 unsigned attrs, Native getter, Native setter)
{
    RootedValue value(cx, ObjectValue(*valueArg));
    return DefineElement(cx, obj, index, value, attrs, getter, setter);
}

JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, HandleString valueArg,
                 unsigned attrs, Native getter, Native setter)
{
    RootedValue value(cx, StringValue(valueArg));
    return DefineElement(cx, obj, index, value, attrs, getter, setter);
}

JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, int32_t valueArg,
                 unsigned attrs, Native getter, Native setter)
{
    Value value = Int32Value(valueArg);
    return DefineElement(cx, obj, index, HandleValue::fromMarkedLocation(&value),
                         attrs, getter, setter);
}

JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, uint32_t valueArg,
                 unsigned attrs, Native getter, Native setter)
{
    Value value = NumberValue(valueArg);
    return DefineElement(cx, obj, index, HandleValue::fromMarkedLocation(&value),
                         attrs, getter, setter);
}

JS_PUBLIC_API(bool)
JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, double valueArg,
                 unsigned attrs, Native getter, Native setter)
{
    Value value = NumberValue(valueArg);
    return DefineElement(cx, obj, index, HandleValue::fromMarkedLocation(&value),
                         attrs, getter, setter);
}

JS_PUBLIC_API(bool)
JS_HasPropertyById(JSContext* cx, HandleObject obj, HandleId id, bool* foundp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    return HasProperty(cx, obj, id, foundp);
}

JS_PUBLIC_API(bool)
JS_HasProperty(JSContext* cx, HandleObject obj, const char* name, bool* foundp)
{
    JSAtom* atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_HasPropertyById(cx, obj, id, foundp);
}

JS_PUBLIC_API(bool)
JS_HasUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen, bool* foundp)
{
    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_HasPropertyById(cx, obj, id, foundp);
}

JS_PUBLIC_API(bool)
JS_HasElement(JSContext* cx, HandleObject obj, uint32_t index, bool* foundp)
{
    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(bool)
JS_HasOwnPropertyById(JSContext* cx, HandleObject obj, HandleId id, bool* foundp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);

    return HasOwnProperty(cx, obj, id, foundp);
}

JS_PUBLIC_API(bool)
JS_HasOwnProperty(JSContext* cx, HandleObject obj, const char* name, bool* foundp)
{
    JSAtom* atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_HasOwnPropertyById(cx, obj, id, foundp);
}

JS_PUBLIC_API(bool)
JS_ForwardGetPropertyTo(JSContext* cx, HandleObject obj, HandleId id, HandleValue receiver,
                        MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id, receiver);

    return GetProperty(cx, obj, receiver, id, vp);
}

JS_PUBLIC_API(bool)
JS_ForwardGetElementTo(JSContext* cx, HandleObject obj, uint32_t index, HandleObject receiver,
                       MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    return GetElement(cx, obj, receiver, index, vp);
}

JS_PUBLIC_API(bool)
JS_GetPropertyById(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp)
{
    RootedValue receiver(cx, ObjectValue(*obj));
    return JS_ForwardGetPropertyTo(cx, obj, id, receiver, vp);
}

JS_PUBLIC_API(bool)
JS_GetProperty(JSContext* cx, HandleObject obj, const char* name, MutableHandleValue vp)
{
    JSAtom* atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_GetPropertyById(cx, obj, id, vp);
}

JS_PUBLIC_API(bool)
JS_GetUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                 MutableHandleValue vp)
{
    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_GetPropertyById(cx, obj, id, vp);
}

JS_PUBLIC_API(bool)
JS_GetElement(JSContext* cx, HandleObject objArg, uint32_t index, MutableHandleValue vp)
{
    return JS_ForwardGetElementTo(cx, objArg, index, objArg, vp);
}

JS_PUBLIC_API(bool)
JS_ForwardSetPropertyTo(JSContext* cx, HandleObject obj, HandleId id, HandleValue v,
                        HandleValue receiver, ObjectOpResult& result)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id, receiver);

    return SetProperty(cx, obj, id, v, receiver, result);
}

JS_PUBLIC_API(bool)
JS_SetPropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleValue v)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);

    RootedValue receiver(cx, ObjectValue(*obj));
    ObjectOpResult ignored;
    return SetProperty(cx, obj, id, v, receiver, ignored);
}

JS_PUBLIC_API(bool)
JS_SetProperty(JSContext* cx, HandleObject obj, const char* name, HandleValue v)
{
    JSAtom* atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_SetPropertyById(cx, obj, id, v);
}

JS_PUBLIC_API(bool)
JS_SetUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                 HandleValue v)
{
    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_SetPropertyById(cx, obj, id, v);
}

static bool
SetElement(JSContext* cx, HandleObject obj, uint32_t index, HandleValue v)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, v);

    RootedValue receiver(cx, ObjectValue(*obj));
    ObjectOpResult ignored;
    return SetElement(cx, obj, index, v, receiver, ignored);
}

JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, HandleValue v)
{
    return SetElement(cx, obj, index, v);
}

JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, HandleObject v)
{
    RootedValue value(cx, ObjectOrNullValue(v));
    return SetElement(cx, obj, index, value);
}

JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, HandleString v)
{
    RootedValue value(cx, StringValue(v));
    return SetElement(cx, obj, index, value);
}

JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, int32_t v)
{
    RootedValue value(cx, NumberValue(v));
    return SetElement(cx, obj, index, value);
}

JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, uint32_t v)
{
    RootedValue value(cx, NumberValue(v));
    return SetElement(cx, obj, index, value);
}

JS_PUBLIC_API(bool)
JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, double v)
{
    RootedValue value(cx, NumberValue(v));
    return SetElement(cx, obj, index, value);
}

JS_PUBLIC_API(bool)
JS_DeletePropertyById(JSContext* cx, HandleObject obj, HandleId id, ObjectOpResult& result)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);

    return DeleteProperty(cx, obj, id, result);
}

JS_PUBLIC_API(bool)
JS_DeleteProperty(JSContext* cx, HandleObject obj, const char* name, ObjectOpResult& result)
{
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    JSAtom* atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return DeleteProperty(cx, obj, id, result);
}

JS_PUBLIC_API(bool)
JS_DeleteUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                    ObjectOpResult& result)
{
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return DeleteProperty(cx, obj, id, result);
}

JS_PUBLIC_API(bool)
JS_DeleteElement(JSContext* cx, HandleObject obj, uint32_t index, ObjectOpResult& result)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    return DeleteElement(cx, obj, index, result);
}

JS_PUBLIC_API(bool)
JS_DeletePropertyById(JSContext* cx, HandleObject obj, HandleId id)
{
    ObjectOpResult ignored;
    return JS_DeletePropertyById(cx, obj, id, ignored);
}

JS_PUBLIC_API(bool)
JS_DeleteProperty(JSContext* cx, HandleObject obj, const char* name)
{
    ObjectOpResult ignored;
    return JS_DeleteProperty(cx, obj, name, ignored);
}

JS_PUBLIC_API(bool)
JS_DeleteElement(JSContext* cx, HandleObject obj, uint32_t index)
{
    ObjectOpResult ignored;
    return JS_DeleteElement(cx, obj, index, ignored);
}

JS_PUBLIC_API(bool)
JS_Enumerate(JSContext* cx, HandleObject obj, JS::MutableHandle<IdVector> props)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    MOZ_ASSERT(props.empty());

    AutoIdVector ids(cx);
    if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY, &ids))
        return false;

    return props.append(ids.begin(), ids.end());
}

JS_PUBLIC_API(bool)
JS::IsCallable(JSObject* obj)
{
    return obj->isCallable();
}

JS_PUBLIC_API(bool)
JS::IsConstructor(JSObject* obj)
{
    return obj->isConstructor();
}

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

    ~AutoLastFrameCheck() {
        if (cx->isExceptionPending() &&
            !JS_IsRunning(cx) &&
            (!cx->options().dontReportUncaught() && !cx->options().autoJSAPIOwnsErrorReporting())) {
            ReportUncaughtException(cx);
        }
    }

  private:
    JSContext* cx;
    MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};

JS_PUBLIC_API(bool)
JS_CallFunctionValue(JSContext* cx, HandleObject obj, HandleValue fval, const HandleValueArray& args,
                     MutableHandleValue rval)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, fval, args);
    AutoLastFrameCheck lfc(cx);

    return Invoke(cx, ObjectOrNullValue(obj), fval, args.length(), args.begin(), rval);
}

JS_PUBLIC_API(bool)
JS_CallFunction(JSContext* cx, HandleObject obj, HandleFunction fun, const HandleValueArray& args,
                MutableHandleValue rval)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, fun, args);
    AutoLastFrameCheck lfc(cx);

    return Invoke(cx, ObjectOrNullValue(obj), ObjectValue(*fun), args.length(), args.begin(), rval);
}

JS_PUBLIC_API(bool)
JS_CallFunctionName(JSContext* cx, HandleObject obj, const char* name, const HandleValueArray& args,
                    MutableHandleValue rval)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, args);
    AutoLastFrameCheck lfc(cx);

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

    RootedValue v(cx);
    RootedId id(cx, AtomToId(atom));
    if (!GetProperty(cx, obj, obj, id, &v))
        return false;

    return Invoke(cx, ObjectOrNullValue(obj), v, args.length(), args.begin(), rval);
}

JS_PUBLIC_API(bool)
JS::Call(JSContext* cx, HandleValue thisv, HandleValue fval, const JS::HandleValueArray& args,
         MutableHandleValue rval)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, thisv, fval, args);
    AutoLastFrameCheck lfc(cx);

    return Invoke(cx, thisv, fval, args.length(), args.begin(), rval);
}

JS_PUBLIC_API(bool)
JS::Construct(JSContext* cx, HandleValue fval, HandleObject newTarget, const JS::HandleValueArray& args,
              MutableHandleValue rval)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, fval, newTarget, args);
    AutoLastFrameCheck lfc(cx);

    if (!IsConstructor(fval)) {
        ReportValueError(cx, JSMSG_NOT_CONSTRUCTOR, JSDVG_IGNORE_STACK, fval, nullptr);
        return false;
    }

    RootedValue newTargetVal(cx, ObjectValue(*newTarget));
    if (!IsConstructor(newTargetVal)) {
        ReportValueError(cx, JSMSG_NOT_CONSTRUCTOR, JSDVG_IGNORE_STACK, newTargetVal, nullptr);
        return false;
    }

    ConstructArgs cargs(cx);
    if (!FillArgumentsFromArraylike(cx, cargs, args))
        return false;

    return js::Construct(cx, fval, cargs, newTargetVal, rval);
}

JS_PUBLIC_API(bool)
JS::Construct(JSContext* cx, HandleValue fval, const JS::HandleValueArray& args,
              MutableHandleValue rval)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, fval, args);
    AutoLastFrameCheck lfc(cx);

    if (!IsConstructor(fval)) {
        ReportValueError(cx, JSMSG_NOT_CONSTRUCTOR, JSDVG_IGNORE_STACK, fval, nullptr);
        return false;
    }

    ConstructArgs cargs(cx);
    if (!FillArgumentsFromArraylike(cx, cargs, args))
        return false;

    return js::Construct(cx, fval, cargs, fval, rval);
}


/* * */

JS_PUBLIC_API(bool)
JS_AlreadyHasOwnPropertyById(JSContext* cx, HandleObject obj, HandleId id, bool* foundp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);

    if (!obj->isNative())
        return js::HasOwnProperty(cx, obj, id, foundp);

    RootedNativeObject nativeObj(cx, &obj->as<NativeObject>());
    RootedShape prop(cx);
    NativeLookupOwnPropertyNoResolve(cx, nativeObj, id, &prop);
    *foundp = !!prop;
    return true;
}

JS_PUBLIC_API(bool)
JS_AlreadyHasOwnProperty(JSContext* cx, HandleObject obj, const char* name, bool* foundp)
{
    JSAtom* atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_AlreadyHasOwnPropertyById(cx, obj, id, foundp);
}

JS_PUBLIC_API(bool)
JS_AlreadyHasOwnUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
                           bool* foundp)
{
    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return false;
    RootedId id(cx, AtomToId(atom));
    return JS_AlreadyHasOwnPropertyById(cx, obj, id, foundp);
}

JS_PUBLIC_API(bool)
JS_AlreadyHasOwnElement(JSContext* cx, HandleObject obj, uint32_t index, bool* foundp)
{
    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(bool)
JS_FreezeObject(JSContext* cx, HandleObject obj)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    return FreezeObject(cx, obj);
}

JS_PUBLIC_API(bool)
JS_DeepFreezeObject(JSContext* cx, HandleObject obj)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    /* Assume that non-extensible objects are already deep-frozen, to avoid divergence. */
    bool extensible;
    if (!IsExtensible(cx, obj, &extensible))
        return false;
    if (!extensible)
        return true;

    if (!FreezeObject(cx, obj))
        return false;

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