js/src/jsapi.cpp
author Jason Orendorff <jorendorff@mozilla.com>
Mon, 16 Mar 2015 20:28:44 -0500
changeset 265462 3e8cc3750b9c64641afc78d374455be8cdc4a79d
parent 265299 c3638d994edd641c54b6cfcc60d8f32576530eca
child 265752 a4246efc8a253cabde698fbab437824bbcb08915
permissions -rw-r--r--
Bug 1144819 - Change JS_DefineProperty APIs to treat getter=nullptr and setter=nullptr as indicating class getter/setter ops only for data properties. r=Waldo.

/* -*- 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/Proxy.h"
#include "js/SliceBudget.h"
#include "js/StructuredClone.h"
#if ENABLE_INTL_API
#include "unicode/uclean.h"
#include "unicode/utypes.h"
#endif // ENABLE_INTL_API
#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/WeakMapObject.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/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) {
    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
ErrorTakesIdArgument(unsigned msg)
{
    MOZ_ASSERT(msg < JSErr_Limit);
    unsigned argCount = js_ErrorFormatString[msg].argCount;
    MOZ_ASSERT(argCount <= 1);
    return argCount == 1;
}

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) {
        RootedValue val(cx, ObjectValue(*obj));
        return ReportValueErrorFlags(cx, flags, code_, JSDVG_IGNORE_STACK, val,
                                     NullPtr(), nullptr, nullptr);
    }
    if (ErrorTakesIdArgument(code_)) {
        RootedValue idv(cx, IdToValue(id));
        RootedString str(cx, ValueToSource(cx, idv));
        if (!str)
            return false;

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

        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(!ErrorTakesIdArgument(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(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)
{
    MOZ_ASSERT(rt->hasContexts());
    return rt->emptyString;
}

JS_PUBLIC_API(bool)
JS_GetCompartmentStats(JSRuntime *rt, CompartmentStatsVector &stats)
{
    for (CompartmentsIter c(rt, WithAtoms); !c.done(); c.next()) {
        if (!stats.growBy(1))
            return false;

        CompartmentTimeStats *stat = &stats.back();
        stat->time = c.get()->totalTime;
        stat->compartment = c.get();
        stat->addonId = c.get()->addonId;
        if (rt->compartmentNameCallback) {
            (*rt->compartmentNameCallback)(rt, stat->compartment,
                                           stat->compartmentName,
                                           MOZ_ARRAY_LENGTH(stat->compartmentName));
        } else {
            strcpy(stat->compartmentName, "<unknown>");
        }
    }
    return true;
}

namespace js {

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

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

}

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();
}

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

/*
 * SpiderMonkey's initialization status is tracked here, and it controls things
 * that should happen only once across all runtimes.  It's an API requirement
 * that JS_Init (and JS_ShutDown, if called) be called in a thread-aware
 * manner, so this variable doesn't need to be atomic.
 *
 * The only reason at present for the restriction that you can't call
 * JS_Init/stuff/JS_ShutDown multiple times is the Windows PRMJ NowInit
 * initialization code, which uses PR_CallOnce to initialize the PRMJ_Now
 * subsystem.  (For reinitialization to be permitted, we'd need to "reset" the
 * called-once status -- doable, but more trouble than it's worth now.)
 * Initializing that subsystem from JS_Init eliminates the problem, but
 * initialization can take a comparatively long time (15ms or so), so we
 * really don't want to do it in JS_Init, and we really do want to do it only
 * when PRMJ_Now is eventually called.
 */
enum InitState { Uninitialized, Running, ShutDown };
static InitState jsInitState = Uninitialized;

#ifdef DEBUG
static unsigned
MessageParameterCount(const char *format)
{
    unsigned numfmtspecs = 0;
    for (const char *fmt = format; *fmt != '\0'; fmt++) {
        if (*fmt == '{' && isdigit(fmt[1]))
            ++numfmtspecs;
    }
    return numfmtspecs;
}

static void
CheckMessageParameterCounts()
{
    // Assert that each message format has the correct number of braced
    // parameters.
# define MSG_DEF(name, count, exception, format)           \
        MOZ_ASSERT(MessageParameterCount(format) == count);
# include "js.msg"
# undef MSG_DEF
}
#endif /* DEBUG */

JS_PUBLIC_API(bool)
JS_Init(void)
{
    MOZ_ASSERT(jsInitState == Uninitialized,
               "must call JS_Init once before any JSAPI operation except "
               "JS_SetICUMemoryFunctions");
    MOZ_ASSERT(!JSRuntime::hasLiveRuntimes(),
               "how do we have live runtimes before JS_Init?");

    PRMJ_NowInit();

#ifdef DEBUG
    CheckMessageParameterCounts();
#endif

    using js::TlsPerThreadData;
    if (!TlsPerThreadData.initialized() && !TlsPerThreadData.init())
        return false;

    if (!jit::InitializeIon())
        return false;

#if EXPOSE_INTL_API
    UErrorCode err = U_ZERO_ERROR;
    u_init(&err);
    if (U_FAILURE(err))
        return false;
#endif // EXPOSE_INTL_API

    if (!CreateHelperThreadsState())
        return false;

    if (!FutexRuntime::initialize())
        return false;

    jsInitState = Running;
    return true;
}

JS_PUBLIC_API(void)
JS_ShutDown(void)
{
    MOZ_ASSERT(jsInitState == Running,
               "JS_ShutDown must only be called after JS_Init and can't race with it");
#ifdef DEBUG
    if (JSRuntime::hasLiveRuntimes()) {
        // Gecko is too buggy to assert this just yet.
        fprintf(stderr,
                "WARNING: YOU ARE LEAKING THE WORLD (at least one JSRuntime "
                "and everything alive inside it, that is) AT JS_ShutDown "
                "TIME.  FIX THIS!\n");
    }
#endif

    FutexRuntime::destroy();

    DestroyHelperThreadsState();

#ifdef JS_TRACE_LOGGING
    DestroyTraceLoggerThreadState();
    DestroyTraceLoggerGraphState();
#endif

    PRMJ_NowShutdown();

#if EXPOSE_INTL_API
    u_cleanup();
#endif // EXPOSE_INTL_API

    jsInitState = ShutDown;
}

#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(jsInitState == Running,
               "must call JS_Init prior to creating any JSRuntimes");

    // Any parent runtime should be the topmost parent. This assert
    // isn't required for correctness, but ensuring that the parent
    // runtime is not destroyed before this one is more easily done
    // for the main runtime in the process.
    MOZ_ASSERT_IF(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);
}

JS_PUBLIC_API(bool)
JS_SetICUMemoryFunctions(JS_ICUAllocFn allocFn, JS_ICUReallocFn reallocFn, JS_ICUFreeFn freeFn)
{
    MOZ_ASSERT(jsInitState == Uninitialized,
               "must call JS_SetICUMemoryFunctions before any other JSAPI "
               "operation (including JS_Init)");

#if EXPOSE_INTL_API
    UErrorCode status = U_ZERO_ERROR;
    u_setMemoryFunctions(/* context = */ nullptr, allocFn, reallocFn, freeFn, &status);
    return U_SUCCESS(status);
#else
    return true;
#endif
}

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)
  : 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_);
}

JSAutoNullableCompartment::JSAutoNullableCompartment(JSContext *cx,
                                                     JSObject *targetOrNull)
  : cx_(cx),
    oldCompartment_(cx->compartment())
{
    AssertHeapIsIdleOrIterating(cx_);
    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_InternJSString(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(JSRuntime *rt, HandleString name, const JSStdName *table)
{
    MOZ_ASSERT(name->isAtom());
    for (unsigned i = 0; !table[i].isSentinel(); i++) {
        if (table[i].isDummy())
            continue;
        JSAtom *atom = AtomStateOffsetToName(*rt->commonNames, 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;

    RootedString idstr(cx, JSID_TO_STRING(id));

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

    /* Try for class constructors/prototypes named by well-known atoms. */
    stdnm = LookupStdName(rt, idstr, standard_class_names);

    /* Try less frequently used top-level functions and constants. */
    if (!stdnm)
        stdnm = LookupStdName(rt, idstr, 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 && !(ProtoKeyToClass(key)->flags & JSCLASS_IS_ANONYMOUS)) {
        if (!GlobalObject::ensureConstructor(cx, global, stdnm->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_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;
    RootedString idstr(cx, JSID_TO_STRING(id));
    const JSStdName *stdnm = LookupStdName(cx->runtime(), idstr, 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_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>();
}

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(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 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);
}

extern JS_PUBLIC_API(bool)
JS_IsGCMarkingTracer(JSTracer *trc)
{
    return js::IsMarkingTracer(trc);
}

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_AddWeakPointerCallback(JSRuntime *rt, JSWeakPointerCallback cb, void *data)
{
    AssertHeapIsIdle(rt);
    return rt->gc.addWeakPointerCallback(cb, data);
}

JS_PUBLIC_API(void)
JS_RemoveWeakPointerCallback(JSRuntime *rt, JSWeakPointerCallback cb)
{
    rt->gc.removeWeakPointerCallback(cb);
}

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

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

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

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

JS_PUBLIC_API(jsid)
JS_IdArrayGet(JSContext *cx, JSIdArray *ida, unsigned index)
{
    MOZ_ASSERT(index < unsigned(ida->length));
    return ida->vector[index];
}

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

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_DefaultValue(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);
    return ToPrimitive(cx, obj, hint, vp);
}

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(bool)
JS_GetPrototype(JSContext *cx, JS::Handle<JSObject*> obj, JS::MutableHandle<JSObject*> protop)
{
    return GetPrototype(cx, obj, protop);
}

JS_PUBLIC_API(bool)
JS_SetPrototype(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<JSObject*> 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(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();
}

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());
            if (!JS_DeepFreezeObject(cx, obj))
                return false;
        }
    }

    return true;
}

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_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_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);
}

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

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_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_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_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);
}

/*
 * 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;
}

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)) {
            RootedObject global(cx, (JSObject*) &obj->global());
            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);
            RootedObject global(cx, (JSObject*) &obj->global());
            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);
}

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 = UINT_TO_JSVAL(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
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
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 = UINT_TO_JSVAL(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);
}

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));

    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 false;
        id = AtomToId(atom);
    }

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

static bool
DefineSelfHostedProperty(JSContext *cx, HandleObject obj, HandleId id,
                         const char *getterName, const char *setterName,
                         unsigned attrs, unsigned flags)
{
    RootedAtom getterNameAtom(cx, Atomize(cx, getterName, strlen(getterName)));
    if (!getterNameAtom)
        return false;

    RootedAtom name(cx, IdToFunctionName(cx, id));
    if (!name)
        return false;

    RootedValue getterValue(cx);
    if (!cx->global()->getSelfHostedFunction(cx, getterNameAtom, name, 0, &getterValue))
        return false;
    MOZ_ASSERT(getterValue.isObject() && getterValue.toObject().is<JSFunction>());
    RootedFunction getterFunc(cx, &getterValue.toObject().as<JSFunction>());
    JSNative getterOp = JS_DATA_TO_FUNC_PTR(JSNative, getterFunc.get());

    RootedFunction setterFunc(cx);
    if (setterName) {
        RootedAtom setterNameAtom(cx, Atomize(cx, setterName, strlen(setterName)));
        if (!setterNameAtom)
            return false;

        RootedValue setterValue(cx);
        if (!cx->global()->getSelfHostedFunction(cx, setterNameAtom, name, 0, &setterValue))
            return false;
        MOZ_ASSERT(setterValue.isObject() && setterValue.toObject().is<JSFunction>());
        setterFunc = &getterValue.toObject().as<JSFunction>();
    }
    JSNative setterOp = JS_DATA_TO_FUNC_PTR(JSNative, setterFunc.get());

    return DefinePropertyById(cx, obj, id, JS::UndefinedHandleValue,
                              NativeOpWrapper(getterOp), NativeOpWrapper(setterOp),
                              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 = UINT_TO_JSVAL(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);
}

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 = UINT_TO_JSVAL(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);
}

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);
}

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

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

    RootedObject nobj(cx, NewObjectWithClassProto(cx, clasp, NullPtr()));
    if (!nobj)
        return nullptr;

    RootedValue nobjValue(cx, ObjectValue(*nobj));
    if (!DefineProperty(cx, obj, name, nobjValue, NativeOpWrapper(nullptr), NativeOpWrapper(nullptr),
                        attrs, 0)) {
        return nullptr;
    }

    return nobj;
}

static inline Value
ValueFromScalar(double x)
{
    return DoubleValue(x);
}
static inline Value
ValueFromScalar(int32_t x)
{
    return Int32Value(x);
}

template<typename T>
static bool
DefineConstScalar(JSContext *cx, HandleObject obj, const JSConstScalarSpec<T> *cds)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JSNativeWrapper noget = NativeOpWrapper(nullptr);
    JSNativeWrapper noset = NativeOpWrapper(nullptr);
    unsigned attrs = JSPROP_READONLY | JSPROP_PERMANENT;
    for (; cds->name; cds++) {
        RootedValue value(cx, ValueFromScalar(cds->val));
        if (!DefineProperty(cx, obj, cds->name, value, noget, noset, attrs, 0))
            return false;
    }
    return true;
}

JS_PUBLIC_API(bool)
JS_DefineConstDoubles(JSContext *cx, HandleObject obj, const JSConstDoubleSpec *cds)
{
    return DefineConstScalar(cx, obj, cds);
}
JS_PUBLIC_API(bool)
JS_DefineConstIntegers(JSContext *cx, HandleObject obj, const JSConstIntegerSpec *cis)
{
    return DefineConstScalar(cx, obj, cis);
}

static JS::SymbolCode
PropertySpecNameToSymbolCode(const char *name)
{
    MOZ_ASSERT(JS::PropertySpecNameIsSymbol(name));
    uintptr_t u = reinterpret_cast<uintptr_t>(name);
    return JS::SymbolCode(u - 1);
}

static bool
PropertySpecNameToId(JSContext *cx, const char *name, MutableHandleId id,
                     js::InternBehavior ib = js::DoNotInternAtom)
{
    if (JS::PropertySpecNameIsSymbol(name)) {
        JS::SymbolCode which = PropertySpecNameToSymbolCode(name);
        id.set(SYMBOL_TO_JSID(cx->wellKnownSymbols().get(which)));
    } else {
        JSAtom *atom = Atomize(cx, name, strlen(name), ib);
        if (!atom)
            return false;
        id.set(AtomToId(atom));
    }
    return true;
}

JS_PUBLIC_API(bool)
JS::PropertySpecNameToPermanentId(JSContext *cx, const char *name, jsid *idp)
{
    // We are calling fromMarkedLocation(idp) even though idp points to a
    // location that will never be marked. This is OK because the whole point
    // of this API is to populate *idp with a jsid that does not need to be
    // marked.
    return PropertySpecNameToId(cx, name, MutableHandleId::fromMarkedLocation(idp),
                                js::InternAtom);
}

JS_PUBLIC_API(bool)
JS_DefineProperties(JSContext *cx, HandleObject obj, const JSPropertySpec *ps)
{
    RootedId id(cx);

    for (; ps->name; ps++) {
        if (!PropertySpecNameToId(cx, ps->name, &id))
            return false;

        if (ps->isSelfHosted()) {
            if (!DefineSelfHostedProperty(cx, obj, id,
                                          ps->getter.selfHosted.funname,
                                          ps->setter.selfHosted.funname,
                                          ps->flags, 0))
            {
                return false;
            }
        } else {
            if (!DefinePropertyById(cx, obj, id, JS::UndefinedHandleValue,
                                    ps->getter.native, ps->setter.native, ps->flags, 0))
            {
                return false;
            }
        }
    }
    return true;
}

JS_PUBLIC_API(bool)
JS::ObjectToCompletePropertyDescriptor(JSContext *cx,
                                       HandleObject obj,
                                       HandleValue descObj,
                                       MutableHandle<JSPropertyDescriptor> desc)
{
    if (!ToPropertyDescriptor(cx, descObj, true, desc))
        return false;
    CompletePropertyDescriptor(desc);
    desc.object().set(obj);
    return true;
}

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);
}

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

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

    return GetProperty(cx, obj, onBehalfOf, 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_ForwardGetElementTo(JSContext *cx, HandleObject obj, uint32_t index, HandleObject onBehalfOf,
                       MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    return GetElement(cx, obj, onBehalfOf, index, 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_SetPropertyById(JSContext *cx, HandleObject obj, HandleId id, HandleValue v)
{
    RootedValue value(cx, v);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, id);

    ObjectOpResult ignored;
    return SetProperty(cx, obj, obj, id, &value, ignored);
}

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);

    // XXX Bug 603201 will eliminate this ToObject.
    RootedObject receiverObj(cx, ToObject(cx, receiver));
    if (!receiverObj)
        return false;

    RootedValue value(cx, v);
    return SetProperty(cx, obj, receiverObj, id, &value, result);
}

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

    ObjectOpResult ignored;
    return SetElement(cx, obj, obj, index, vp, ignored);
}

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

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_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);
}

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_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_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_DeletePropertyById(JSContext *cx, HandleObject obj, HandleId id)
{
    ObjectOpResult ignored;
    return JS_DeletePropertyById(cx, obj, id, 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_DeleteProperty(JSContext *cx, HandleObject obj, const char *name)
{
    ObjectOpResult ignored;
    return JS_DeleteProperty(cx, obj, name, ignored);
}

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;

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

JS_PUBLIC_API(JSIdArray *)
JS_Enumerate(JSContext *cx, HandleObject obj)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

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

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

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

JS_PUBLIC_API(JSObject *)
JS_NewArrayObject(JSContext *cx, const JS::HandleValueArray& contents)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    assertSameCompartment(cx, contents);
    return NewDenseCopiedArray(cx, contents.length(), contents.begin());
}

JS_PUBLIC_API(JSObject *)
JS_NewArrayObject(JSContext *cx, size_t length)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    return NewDenseFullyAllocatedArray(cx, length);
}

JS_PUBLIC_API(bool)
JS_IsArrayObject(JSContext *cx, JS::HandleObject obj)
{
    assertSameCompartment(cx, obj);
    return ObjectClassIs(obj, ESClass_Array, cx);
}

JS_PUBLIC_API(bool)
JS_IsArrayObject(JSContext *cx, JS::HandleValue value)
{
    if (!value.isObject())
        return false;
    RootedObject obj(cx, &value.toObject());
    return JS_IsArrayObject(cx, obj);
}

JS_PUBLIC_API(bool)
JS_GetArrayLength(JSContext *cx, HandleObject obj, uint32_t *lengthp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    return GetLengthProperty(cx, obj, lengthp);
}

JS_PUBLIC_API(bool)
JS_SetArrayLength(JSContext *cx, HandleObject obj, uint32_t length)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    return SetLengthProperty(cx, obj, length);
}

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

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

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

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

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

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

JS_PUBLIC_API(JSFunction *)
JS_NewFunction(JSContext *cx, JSNative native, unsigned nargs, unsigned flags,
               const char *name)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

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

    return (flags & JSFUN_CONSTRUCTOR)
           ? NewNativeConstructor(cx, native, nargs, atom)
           : NewNativeFunction(cx, native, nargs, atom);
}

JS_PUBLIC_API(JSFunction *)
JS_NewFunctionById(JSContext *cx, JSNative native, unsigned nargs, unsigned flags,
                   HandleId id)
{
    MOZ_ASSERT(JSID_IS_STRING(id));
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    MOZ_ASSERT(native);
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RootedAtom name(cx, JSID_TO_ATOM(id));
    return (flags & JSFUN_CONSTRUCTOR)
           ? NewNativeConstructor(cx, native, nargs, name)
           : NewNativeFunction(cx, native, nargs, name);
}

JS_PUBLIC_API(JSFunction *)
JS::GetSelfHostedFunction(JSContext *cx, const char *selfHostedName, HandleId id, unsigned nargs)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RootedAtom name(cx, IdToFunctionName(cx, id));
    if (!name)
        return nullptr;

    RootedAtom shName(cx, Atomize(cx, selfHostedName, strlen(selfHostedName)));
    if (!shName)
        return nullptr;
    RootedValue funVal(cx);
    if (!cx->global()->getSelfHostedFunction(cx, shName, name, nargs, &funVal))
        return nullptr;
    return &funVal.toObject().as<JSFunction>();
}

static bool
CreateScopeObjectsForScopeChain(JSContext *cx, AutoObjectVector &scopeChain,
                                MutableHandleObject dynamicScopeObj,
                                MutableHandleObject staticScopeObj)
{
    return js::CreateScopeObjectsForScopeChain(cx, scopeChain, cx->global(),
                                               dynamicScopeObj, staticScopeObj);
}

static bool
IsFunctionCloneable(HandleFunction fun, HandleObject dynamicScope)
{
    if (!fun->isInterpreted())
        return true;

    // If a function was compiled to be lexically nested inside some other
    // script, we cannot clone it without breaking the compiler's assumptions.
    JSObject *scope = fun->nonLazyScript()->enclosingStaticScope();
    if (scope && (!scope->is<StaticEvalObject>() ||
                  scope->as<StaticEvalObject>().isDirect() ||
                  scope->as<StaticEvalObject>().isStrict()))
    {
        return false;
    }

    return !fun->nonLazyScript()->compileAndGo() || dynamicScope->is<GlobalObject>();
}

static JSObject *
CloneFunctionObject(JSContext *cx, HandleObject funobj, HandleObject dynamicScope)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, dynamicScope);
    MOZ_ASSERT(dynamicScope);
    // Note that funobj can be in a different compartment.

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

    RootedFunction fun(cx, &funobj->as<JSFunction>());
    if (fun->isInterpretedLazy()) {
        AutoCompartment ac(cx, funobj);
        if (!fun->getOrCreateScript(cx))
            return nullptr;
    }

    if (!IsFunctionCloneable(fun, dynamicScope)) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_BAD_CLONE_FUNOBJ_SCOPE);
        return nullptr;
    }

    if (fun->isBoundFunction()) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CANT_CLONE_OBJECT);
        return nullptr;
    }

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

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

namespace JS {

JS_PUBLIC_API(JSObject *)
CloneFunctionObject(JSContext *cx, JS::Handle<JSObject*> funobj)
{
    return CloneFunctionObject(cx, funobj, cx->global());
}

extern JS_PUBLIC_API(JSObject *)
CloneFunctionObject(JSContext *cx, HandleObject funobj, AutoObjectVector &scopeChain)
{
    RootedObject dynamicScope(cx);
    RootedObject unusedStaticScope(cx);
    if (!CreateScopeObjectsForScopeChain(cx, scopeChain, &dynamicScope, &unusedStaticScope))
        return nullptr;

    return CloneFunctionObject(cx, funobj, dynamicScope);
}

} // namespace JS

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();
}

namespace JS {

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

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

} /* namespace JS */

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

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

JS_PUBLIC_API(JSObject*)
JS_BindCallable(JSContext *cx, HandleObject target, HandleObject newThis)
{
    RootedValue thisArg(cx, ObjectValue(*newThis));
    return fun_bind(cx, target, thisArg, nullptr, 0);
}

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

    const JSFunctionSpec *fs = (JSFunctionSpec *)
        args.callee().as<JSFunction>().getExtendedSlot(0).toPrivate();
    MOZ_ASSERT((fs->flags & JSFUN_GENERIC_NATIVE) != 0);

    if (argc < 1) {
        ReportMissingArg(cx, args.calleev(), 0);
        return 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(bool)
JS_DefineFunctions(JSContext *cx, HandleObject obj, const JSFunctionSpec *fs,
                   PropertyDefinitionBehavior behavior)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    RootedId id(cx);
    for (; fs->name; fs++) {
        if (!PropertySpecNameToId(cx, fs->name, &id))
            return false;

        unsigned flags = fs->flags;
        switch (behavior) {
          case DefineAllProperties:
            break;
          case OnlyDefineLateProperties:
            if (!(flags & JSPROP_DEFINE_LATE))
                continue;
            break;
          default:
            MOZ_ASSERT(behavior == DontDefineLateProperties);
            if (flags & JSPROP_DEFINE_LATE)
                continue;
        }

        /*
         * Define a generic arity N+1 static method for the arity N prototype
         * method if flags contains JSFUN_GENERIC_NATIVE.
         */
        if (flags & JSFUN_GENERIC_NATIVE) {
            // We require that any consumers using JSFUN_GENERIC_NATIVE stash
            // the prototype and constructor in the global slots before invoking
            // JS_DefineFunctions on the proto.
            JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(obj->getClass());
            MOZ_ASSERT(obj == &obj->global().getPrototype(key).toObject());
            RootedObject ctor(cx, &obj->global().getConstructor(key).toObject());

            flags &= ~JSFUN_GENERIC_NATIVE;
            JSFunction *fun = DefineFunction(cx, ctor, id,
                                             GenericNativeMethodDispatcher,
                                             fs->nargs + 1, flags,
                                             JSFunction::ExtendedFinalizeKind);
            if (!fun)
                return 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 nullptr JSNative which
         * produces an interpreted JSFunction where !hasScript. Interpreted
         * call paths then call InitializeLazyFunctionScript if !hasScript.
         */
        if (fs->selfHostedName) {
            MOZ_ASSERT(!fs->call.op);
            MOZ_ASSERT(!fs->call.info);

            RootedAtom shName(cx, Atomize(cx, fs->selfHostedName, strlen(fs->selfHostedName)));
            if (!shName)
                return false;
            RootedAtom name(cx, IdToFunctionName(cx, id));
            if (!name)
                return false;
            RootedValue funVal(cx);
            if (!cx->global()->getSelfHostedFunction(cx, shName, name, fs->nargs, &funVal))
                return false;
            if (!DefineProperty(cx, obj, id, funVal, nullptr, nullptr, flags))
                return false;
        } else {
            JSFunction *fun = DefineFunction(cx, obj, id, fs->call.op, fs->nargs, flags);
            if (!fun)
                return false;
            if (fs->call.info)
                fun->setJitInfo(fs->call.info);
        }
    }
    return true;
}

JS_PUBLIC_API(JSFunction *)
JS_DefineFunction(JSContext *cx, HandleObject obj, const char *name, JSNative call,
                  unsigned nargs, unsigned attrs)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JSAtom *atom = Atomize(cx, name, strlen(name));
    if (!atom)
        return nullptr;
    Rooted<jsid> id(cx, AtomToId(atom));
    return DefineFunction(cx, obj, id, call, nargs, attrs);
}

JS_PUBLIC_API(JSFunction *)
JS_DefineUCFunction(JSContext *cx, HandleObject obj,
                    const char16_t *name, size_t namelen, JSNative call,
                    unsigned nargs, unsigned attrs)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    JSAtom *atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
    if (!atom)
        return nullptr;
    Rooted<jsid> id(cx, AtomToId(atom));
    return DefineFunction(cx, obj, id, call, nargs, attrs);
}

extern JS_PUBLIC_API(JSFunction *)
JS_DefineFunctionById(JSContext *cx, HandleObject obj, HandleId id, JSNative call,
                      unsigned nargs, unsigned attrs)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    return DefineFunction(cx, obj, id, call, nargs, attrs);
}

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
};

/* 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;

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;
}

namespace {

class AutoFile
{
    FILE *fp_;
  public:
    AutoFile()
      : fp_(nullptr)
    {}
    ~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)
    {
        MOZ_ASSERT(fp_);
        return ReadCompleteFile(cx, fp_, buffer);
    }
};

} /* anonymous namespace */

/*
 * Open a source file for reading. Supports "-" and nullptr 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, GetErrorMessage, nullptr, JSMSG_CANT_OPEN,
                                 filename, "No such file or directory");
            return false;
        }
    }
    return true;
}

JSObject * const JS::ReadOnlyCompileOptions::nullObjectPtr = nullptr;

void
JS::ReadOnlyCompileOptions::copyPODOptions(const ReadOnlyCompileOptions &rhs)
{
    version = rhs.version;
    versionSet = rhs.versionSet;
    utf8 = rhs.utf8;
    lineno = rhs.lineno;
    column = rhs.column;
    compileAndGo = rhs.compileAndGo;
    forEval = rhs.forEval;
    noScriptRval = rhs.noScriptRval;
    selfHostingMode = rhs.selfHostingMode;
    canLazilyParse = rhs.canLazilyParse;
    strictOption = rhs.strictOption;
    extraWarningsOption = rhs.extraWarningsOption;
    werrorOption = rhs.werrorOption;
    asmJSOption = rhs.asmJSOption;
    forceAsync = rhs.forceAsync;
    installedFile = rhs.installedFile;
    sourceIsLazy = rhs.sourceIsLazy;
    introductionType = rhs.introductionType;
    introductionLineno = rhs.introductionLineno;
    introductionOffset = rhs.introductionOffset;
    hasIntroductionInfo = rhs.hasIntroductionInfo;
}

JS::OwningCompileOptions::OwningCompileOptions(JSContext *cx)
    : ReadOnlyCompileOptions(),
      runtime(GetRuntime(cx)),
      elementRoot(cx),
      elementAttributeNameRoot(cx),
      introductionScriptRoot(cx)
{
}

JS::OwningCompileOptions::~OwningCompileOptions()
{
    // OwningCompileOptions always owns these, so these casts are okay.
    js_free(const_cast<char *>(filename_));
    js_free(const_cast<char16_t *>(sourceMapURL_));
    js_free(const_cast<char *>(introducerFilename_));
}

bool
JS::OwningCompileOptions::copy(JSContext *cx, const ReadOnlyCompileOptions &rhs)
{
    copyPODOptions(rhs);

    setMutedErrors(rhs.mutedErrors());
    setElement(rhs.element());
    setElementAttributeName(rhs.elementAttributeName());
    setIntroductionScript(rhs.introductionScript());

    return setFileAndLine(cx, rhs.filename(), rhs.lineno) &&
           setSourceMapURL(cx, rhs.sourceMapURL()) &&
           setIntroducerFilename(cx, rhs.introducerFilename());
}

bool
JS::OwningCompileOptions::setFile(JSContext *cx, const char *f)
{
    char *copy = nullptr;
    if (f) {
        copy = JS_strdup(cx, f);
        if (!copy)
            return false;
    }

    // OwningCompileOptions always owns filename_, so this cast is okay.
    js_free(const_cast<char *>(filename_));

    filename_ = copy;
    return true;
}

bool
JS::OwningCompileOptions::setFileAndLine(JSContext *cx, const char *f, unsigned l)
{
    if (!setFile(cx, f))
        return false;

    lineno = l;
    return true;
}

bool
JS::OwningCompileOptions::setSourceMapURL(JSContext *cx, const char16_t *s)
{
    UniquePtr<char16_t[], JS::FreePolicy> copy;
    if (s) {
        copy = DuplicateString(cx, s);
        if (!copy)
            return false;
    }

    // OwningCompileOptions always owns sourceMapURL_, so this cast is okay.
    js_free(const_cast<char16_t *>(sourceMapURL_));

    sourceMapURL_ = copy.release();
    return true;
}

bool
JS::OwningCompileOptions::setIntroducerFilename(JSContext *cx, const char *s)
{
    char *copy = nullptr;
    if (s) {
        copy = JS_strdup(cx, s);
        if (!copy)
            return false;
    }

    // OwningCompileOptions always owns introducerFilename_, so this cast is okay.
    js_free(const_cast<char *>(introducerFilename_));

    introducerFilename_ = copy;
    return true;
}

JS::CompileOptions::CompileOptions(JSContext *cx, JSVersion version)
    : ReadOnlyCompileOptions(), elementRoot(cx), elementAttributeNameRoot(cx),
      introductionScriptRoot(cx)
{
    this->version = (version != JSVERSION_UNKNOWN) ? version : cx->findVersion();

    compileAndGo = false;
    strictOption = cx->runtime()->options().strictMode();
    extraWarningsOption = cx->compartment()->options().extraWarnings(cx);
    werrorOption = cx->runtime()->options().werror();
    asmJSOption = cx->runtime()->options().asmJS();
}

bool
JS::Compile(JSContext *cx, const ReadOnlyCompileOptions &options,
            SourceBufferHolder &srcBuf, MutableHandleScript script)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    AutoLastFrameCheck lfc(cx);

    script.set(frontend::CompileScript(cx, &cx->tempLifoAlloc(), cx->global(),
                                       NullPtr(), NullPtr(), options, srcBuf));
    return !!script;
}

bool
JS::Compile(JSContext *cx, const ReadOnlyCompileOptions &options,
            const char16_t *chars, size_t length, MutableHandleScript script)
{
    SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::NoOwnership);
    return Compile(cx, options, srcBuf, script);
}

bool
JS::Compile(JSContext *cx, const ReadOnlyCompileOptions &options,
            const char *bytes, size_t length, MutableHandleScript script)
{
    mozilla::UniquePtr<char16_t, JS::FreePolicy> chars;
    if (options.utf8)
        chars.reset(UTF8CharsToNewTwoByteCharsZ(cx, UTF8Chars(bytes, length), &length).get());
    else
        chars.reset(InflateString(cx, bytes, &length));
    if (!chars)
        return false;

    return Compile(cx, options, chars.get(), length, script);
}

bool
JS::Compile(JSContext *cx, const ReadOnlyCompileOptions &options, FILE *fp,
            MutableHandleScript script)
{
    FileContents buffer(cx);
    if (!ReadCompleteFile(cx, fp, buffer))
        return false;

    return Compile(cx, options, buffer.begin(), buffer.length(), script);
}

bool
JS::Compile(JSContext *cx, const ReadOnlyCompileOptions &optionsArg, const char *filename,
            MutableHandleScript script)
{
    AutoFile file;
    if (!file.open(cx, filename))
        return false;
    CompileOptions options(cx, optionsArg);
    options.setFileAndLine(filename, 1);
    return Compile(cx, options, file.fp(), script);
}

JS_PUBLIC_API(bool)
JS::CanCompileOffThread(JSContext *cx, const ReadOnlyCompileOptions &options, size_t length)
{
    static const size_t TINY_LENGTH = 1000;
    static const size_t HUGE_LENGTH = 100 * 1000;

    // These are heuristics which the caller may choose to ignore (e.g., for
    // testing purposes).
    if (!options.forceAsync) {
        // Compiling off the main thread inolves creating a new Zone and other
        // significant overheads.  Don't bother if the script is tiny.
        if (length < TINY_LENGTH)
            return false;

        // If the parsing task would have to wait for GC to complete, it'll probably
        // be faster to just start it synchronously on the main thread unless the
        // script is huge.
        if (OffThreadParsingMustWaitForGC(cx->runtime()) && length < HUGE_LENGTH)
            return false;
    }

    return cx->runtime()->canUseParallelParsing() && CanUseExtraThreads();
}

JS_PUBLIC_API(bool)
JS::CompileOffThread(JSContext *cx, const ReadOnlyCompileOptions &options,
                     const char16_t *chars, size_t length,
                     OffThreadCompileCallback callback, void *callbackData)
{
    MOZ_ASSERT(CanCompileOffThread(cx, options, length));
    return StartOffThreadParseScript(cx, options, chars, length, callback, callbackData);
}

JS_PUBLIC_API(JSScript *)
JS::FinishOffThreadScript(JSContext *maybecx, JSRuntime *rt, void *token)
{
    MOZ_ASSERT(CurrentThreadCanAccessRuntime(rt));

    if (maybecx) {
        RootedScript script(maybecx);
        {
            AutoLastFrameCheck lfc(maybecx);
            script = HelperThreadState().finishParseTask(maybecx, rt, token);
        }
        return script;
    } else {
        return HelperThreadState().finishParseTask(maybecx, rt, token);
    }
}

JS_PUBLIC_API(bool)
JS_CompileScript(JSContext *cx, const char *ascii, size_t length,
                 const JS::CompileOptions &options, MutableHandleScript script)
{
    return Compile(cx, options, ascii, length, script);
}

JS_PUBLIC_API(bool)
JS_CompileUCScript(JSContext *cx, const char16_t *chars, size_t length,
                   const JS::CompileOptions &options, MutableHandleScript script)
{
    return Compile(cx, options, chars, length, script);
}

JS_PUBLIC_API(bool)
JS_BufferIsCompilableUnit(JSContext *cx, HandleObject obj, const char *utf8, size_t length)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);

    cx->clearPendingException();

    char16_t *chars = JS::UTF8CharsToNewTwoByteCharsZ(cx, JS::UTF8Chars(utf8, length), &length).get();
    if (!chars)
        return true;

    // Return true on any out-of-memory error or non-EOF-related syntax error, so our
    // caller doesn't try to collect more buffered source.
    bool result = true;

    CompileOptions options(cx);
    options.setCompileAndGo(false);
    Parser<frontend::FullParseHandler> parser(cx, &cx->tempLifoAlloc(),
                                              options, chars, length,
                                              /* foldConstants = */ true, nullptr, nullptr);
    JSErrorReporter older = JS_SetErrorReporter(cx->runtime(), nullptr);
    if (!parser.checkOptions() || !parser.parse(obj)) {
        // 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.
        if (parser.isUnexpectedEOF())
            result = false;

        cx->clearPendingException();
    }
    JS_SetErrorReporter(cx->runtime(), older);

    js_free(chars);
    return result;
}

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

JS_PUBLIC_API(const char *)
JS_GetScriptFilename(JSScript *script)
{
    // This is called from ThreadStackHelper which can be called from another
    // thread or inside a signal hander, so we need to be careful in case a
    // copmacting GC is currently moving things around.
    return script->maybeForwardedFilename();
}

JS_PUBLIC_API(unsigned)
JS_GetScriptBaseLineNumber(JSContext *cx, JSScript *script)
{
    return script->lineno();
}

JS_PUBLIC_API(JSScript *)
JS_GetFunctionScript(JSContext *cx, HandleFunction fun)
{
    if (fun->isNative())
        return nullptr;
    if (fun->isInterpretedLazy()) {
        AutoCompartment funCompartment(cx, fun);
        JSScript *script = fun->getOrCreateScript(cx);
        if (!script)
            MOZ_CRASH();
        return script;
    }
    return fun->nonLazyScript();
}

/*
 * enclosingStaticScope is a static enclosing scope, if any (e.g. a
 * StaticWithObject).  If the enclosing scope is the global scope, this must be
 * null.
 *
 * enclosingDynamicScope is a dynamic scope to use, if it's not the global.
 */
static bool
CompileFunction(JSContext *cx, const ReadOnlyCompileOptions &optionsArg,
                const char *name, unsigned nargs, const char *const *argnames,
                SourceBufferHolder &srcBuf,
                HandleObject enclosingDynamicScope,
                HandleObject enclosingStaticScope,
                MutableHandleFunction fun)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, enclosingDynamicScope);
    assertSameCompartment(cx, enclosingStaticScope);
    RootedAtom funAtom(cx);
    AutoLastFrameCheck lfc(cx);

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

    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 false;
    }

    fun.set(NewScriptedFunction(cx, 0, JSFunction::INTERPRETED, funAtom,
                                JSFunction::FinalizeKind, TenuredObject,
                                enclosingDynamicScope));
    if (!fun)
        return false;

    // Make sure to handle cases when we have a polluted scopechain.
    OwningCompileOptions options(cx);
    if (!options.copy(cx, optionsArg))
        return false;
    if (!enclosingDynamicScope->is<GlobalObject>())
        options.setHasPollutedScope(true);

    if (!frontend::CompileFunctionBody(cx, fun, options, formals, srcBuf,
                                       enclosingStaticScope))
        return false;

    return true;
}

JS_PUBLIC_API(bool)
JS::CompileFunction(JSContext *cx, AutoObjectVector &scopeChain,
                    const ReadOnlyCompileOptions &options,
                    const char *name, unsigned nargs, const char *const *argnames,
                    SourceBufferHolder &srcBuf, MutableHandleFunction fun)
{
    RootedObject dynamicScopeObj(cx);
    RootedObject staticScopeObj(cx);
    if (!CreateScopeObjectsForScopeChain(cx, scopeChain, &dynamicScopeObj, &staticScopeObj))
        return false;

    return CompileFunction(cx, options, name, nargs, argnames,
                           srcBuf, dynamicScopeObj, staticScopeObj, fun);
}

JS_PUBLIC_API(bool)
JS::CompileFunction(JSContext *cx, AutoObjectVector &scopeChain,
                    const ReadOnlyCompileOptions &options,
                    const char *name, unsigned nargs, const char *const *argnames,
                    const char16_t *chars, size_t length, MutableHandleFunction fun)
{
    SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::NoOwnership);
    return CompileFunction(cx, scopeChain, options, name, nargs, argnames,
                           srcBuf, fun);
}

JS_PUBLIC_API(bool)
JS::CompileFunction(JSContext *cx, AutoObjectVector &scopeChain,
                    const ReadOnlyCompileOptions &options,
                    const char *name, unsigned nargs, const char *const *argnames,
                    const char *bytes, size_t length, MutableHandleFunction fun)
{
    mozilla::UniquePtr<char16_t, JS::FreePolicy> chars;
    if (options.utf8)
        chars.reset(UTF8CharsToNewTwoByteCharsZ(cx, UTF8Chars(bytes, length), &length).get());
    else
        chars.reset(InflateString(cx, bytes, &length));
    if (!chars)
        return false;

    return CompileFunction(cx, scopeChain, options, name, nargs, argnames,
                           chars.get(), length, fun);
}

JS_PUBLIC_API(JSString *)
JS_DecompileScript(JSContext *cx, HandleScript script, const char *name, unsigned indent)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));

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

JS_PUBLIC_API(JSString *)
JS_DecompileFunction(JSContext *cx, HandleFunction fun, unsigned indent)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, fun);
    return FunctionToString(cx, fun, false, !(indent & JS_DONT_PRETTY_PRINT));
}

JS_PUBLIC_API(JSString *)
JS_DecompileFunctionBody(JSContext *cx, HandleFunction fun, unsigned indent)
{
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, fun);
    return FunctionToString(cx, fun, true, !(indent & JS_DONT_PRETTY_PRINT));
}

MOZ_NEVER_INLINE static bool
ExecuteScript(JSContext *cx, HandleObject obj, HandleScript scriptArg, jsval *rval)
{
    RootedScript script(cx, scriptArg);

    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj, scriptArg);

    if (!script->hasPollutedGlobalScope() && !obj->is<GlobalObject>()) {
        script = CloneScript(cx, NullPtr(), NullPtr(), script, HasPollutedGlobalScope);
        if (!script)
            return false;
        js::Debugger::onNewScript(cx, script);
    }
    AutoLastFrameCheck lfc(cx);
    return Execute(cx, script, *obj, rval);
}

static bool
ExecuteScript(JSContext *cx, AutoObjectVector &scopeChain, HandleScript scriptArg, jsval *rval)
{
    RootedObject dynamicScope(cx);
    RootedObject unusedStaticScope(cx);
    if (!CreateScopeObjectsForScopeChain(cx, scopeChain, &dynamicScope, &unusedStaticScope))
        return false;
    return ExecuteScript(cx, dynamicScope, scriptArg, rval);
}

MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext *cx, HandleScript scriptArg, MutableHandleValue rval)
{
    return ExecuteScript(cx, cx->global(), scriptArg, rval.address());
}

MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext *cx, HandleScript scriptArg)
{
    return ExecuteScript(cx, cx->global(), scriptArg, nullptr);
}

MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext *cx, AutoObjectVector &scopeChain,
                 HandleScript scriptArg, MutableHandleValue rval)
{
    return ExecuteScript(cx, scopeChain, scriptArg, rval.address());
}

MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
JS_ExecuteScript(JSContext *cx, AutoObjectVector &scopeChain, HandleScript scriptArg)
{
    return ExecuteScript(cx, scopeChain, scriptArg, nullptr);
}

JS_PUBLIC_API(bool)
JS::CloneAndExecuteScript(JSContext *cx, HandleScript scriptArg)
{
    CHECK_REQUEST(cx);
    RootedScript script(cx, scriptArg);
    if (script->compartment() != cx->compartment()) {
        script = CloneScript(cx, NullPtr(), NullPtr(), script);
        if (!script)
            return false;

        js::Debugger::onNewScript(cx, script);
    }
    return ExecuteScript(cx, cx->global(), script, nullptr);
}

static const unsigned LARGE_SCRIPT_LENGTH = 500*1024;

static bool
Evaluate(JSContext *cx, HandleObject scope, const ReadOnlyCompileOptions &optionsArg,
         SourceBufferHolder &srcBuf, MutableHandleValue rval)
{
    CompileOptions options(cx, optionsArg);
    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, scope);

    AutoLastFrameCheck lfc(cx);

    options.setCompileAndGo(scope->is<GlobalObject>());
    options.setHasPollutedScope(!scope->is<GlobalObject>());
    SourceCompressionTask sct(cx);
    RootedScript script(cx, frontend::CompileScript(cx, &cx->tempLifoAlloc(),
                                                    scope, NullPtr(), NullPtr(), options,
                                                    srcBuf, nullptr, 0, &sct));
    if (!script)
        return false;

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

    bool result = Execute(cx, script, *scope,
                          options.noScriptRval ? nullptr : rval.address());
    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 = nullptr;
        PrepareZoneForGC(cx->zone());
        cx->runtime()->gc.gc(GC_NORMAL, JS::gcreason::FINISH_LARGE_EVALUATE);
    }

    return result;
}

static bool
Evaluate(JSContext *cx, AutoObjectVector &scopeChain, const ReadOnlyCompileOptions &optionsArg,
         SourceBufferHolder &srcBuf, MutableHandleValue rval)
{
    RootedObject dynamicScope(cx);
    RootedObject unusedStaticScope(cx);
    if (!CreateScopeObjectsForScopeChain(cx, scopeChain, &dynamicScope, &unusedStaticScope))
        return false;
    return ::Evaluate(cx, dynamicScope, optionsArg, srcBuf, rval);
}

static bool
Evaluate(JSContext *cx, const ReadOnlyCompileOptions &optionsArg,
         const char16_t *chars, size_t length, MutableHandleValue rval)
{
  SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::NoOwnership);
  return ::Evaluate(cx, cx->global(), optionsArg, srcBuf, rval);
}

extern JS_PUBLIC_API(bool)
JS::Evaluate(JSContext *cx, const ReadOnlyCompileOptions &options,
             const char *bytes, size_t length, MutableHandleValue rval)
{
    char16_t *chars;
    if (options.utf8)
        chars = UTF8CharsToNewTwoByteCharsZ(cx, JS::UTF8Chars(bytes, length), &length).get();
    else
        chars = InflateString(cx, bytes, &length);
    if (!chars)
        return false;

    SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::GiveOwnership);
    bool ok = ::Evaluate(cx, cx->global(), options, srcBuf, rval);
    return ok;
}

static bool
Evaluate(JSContext *cx, const ReadOnlyCompileOptions &optionsArg,
         const char *filename, MutableHandleValue rval)
{
    FileContents buffer(cx);
    {
        AutoFile file;
        if (!file.open(cx, filename) || !file.readAll(cx, buffer))
            return false;
    }

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

JS_PUBLIC_API(bool)
JS::Evaluate(JSContext *cx, const ReadOnlyCompileOptions &optionsArg,
             SourceBufferHolder &srcBuf, MutableHandleValue rval)
{
    return ::Evaluate(cx, cx->global(), optionsArg, srcBuf, rval);
}

JS_PUBLIC_API(bool)
JS::Evaluate(JSContext *cx, AutoObjectVector &scopeChain, const ReadOnlyCompileOptions &optionsArg,
             SourceBufferHolder &srcBuf, MutableHandleValue rval)
{
    return ::Evaluate(cx, scopeChain, optionsArg, srcBuf, rval);
}

JS_PUBLIC_API(bool)
JS::Evaluate(JSContext *cx, const ReadOnlyCompileOptions &optionsArg,
             const char16_t *chars, size_t length, MutableHandleValue rval)
{
    return ::Evaluate(cx, optionsArg, chars, length, rval);
}

JS_PUBLIC_API(bool)
JS::Evaluate(JSContext *cx, AutoObjectVector &scopeChain, const ReadOnlyCompileOptions &optionsArg,
             const char16_t *chars, size_t length, MutableHandleValue rval)
{
    SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::NoOwnership);
    return ::Evaluate(cx, scopeChain, optionsArg, srcBuf, rval);
}

JS_PUBLIC_API(bool)
JS::Evaluate(JSContext *cx, const ReadOnlyCompileOptions &optionsArg,
             const char *filename, MutableHandleValue rval)
{
    return ::Evaluate(cx, optionsArg, filename, 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_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::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, const JS::HandleValueArray& args,
              MutableHandleValue rval)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, fval, args);
    AutoLastFrameCheck lfc(cx);

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

static JSObject *
JS_NewHelper(JSContext *cx, HandleObject ctor, const JS::HandleValueArray& inputArgs)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, ctor, inputArgs);

    // 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(inputArgs.length()))
        return nullptr;

    args.setCallee(ObjectValue(*ctor));
    args.setThis(NullValue());
    PodCopy(args.array(), inputArgs.begin(), inputArgs.length());

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

    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 (ValueToPrintable(cx, args.rval(), &bytes)) {
            JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_BAD_NEW_RESULT,
                                 bytes.ptr());
        }
        return nullptr;
    }

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

JS_PUBLIC_API(JSObject *)
JS_New(JSContext *cx, HandleObject ctor, const JS::HandleValueArray& inputArgs)
{
    RootedObject obj(cx);
    {
        AutoLastFrameCheck lfc(cx);
        obj = JS_NewHelper(cx, ctor, inputArgs);
    }
    return obj;
}

JS_PUBLIC_API(JSInterruptCallback)
JS_SetInterruptCallback(JSRuntime *rt, JSInterruptCallback callback)
{
    JSInterruptCallback old = rt->interruptCallback;
    rt->interruptCallback = callback;
    return old;
}

JS_PUBLIC_API(JSInterruptCallback)
JS_GetInterruptCallback(JSRuntime *rt)
{
    return rt->interruptCallback;
}

JS_PUBLIC_API(void)
JS_RequestInterruptCallback(JSRuntime *rt)
{
    rt->requestInterrupt(JSRuntime::RequestInterruptUrgent);
}

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

JS_PUBLIC_API(bool)
JS_SaveFrameChain(JSContext *cx)
{
    AssertHeapIsIdleOrIterating(cx);
    CHECK_REQUEST(cx);
    return cx->saveFrameChain();
}

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

JS::AutoSetAsyncStackForNewCalls::AutoSetAsyncStackForNewCalls(
  JSContext *cx, HandleObject stack, HandleString asyncCause)
  : cx(cx),
    oldAsyncStack(cx, cx->runtime()->asyncStackForNewActivations),
    oldAsyncCause(cx, cx->runtime()->asyncCauseForNewActivations)
{
    CHECK_REQUEST(cx);

    SavedFrame *asyncStack = &stack->as<SavedFrame>();
    MOZ_ASSERT(!asyncCause->empty());

    cx->runtime()->asyncStackForNewActivations = asyncStack;
    cx->runtime()->asyncCauseForNewActivations = asyncCause;
}

JS::AutoSetAsyncStackForNewCalls::~AutoSetAsyncStackForNewCalls()
{
    cx->runtime()->asyncCauseForNewActivations = oldAsyncCause;
    cx->runtime()->asyncStackForNewActivations =
      oldAsyncStack ? &oldAsyncStack->as<SavedFrame>() : nullptr;
}

/************************************************************************/
JS_PUBLIC_API(JSString *)
JS_NewStringCopyN(JSContext *cx, const char *s, size_t n)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (!n)
        return cx->names().empty;
    return NewStringCopyN<CanGC>(cx, s, n);
}

JS_PUBLIC_API(JSString *)
JS_NewStringCopyZ(JSContext *cx, const char *s)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (!s || !*s)
        return cx->runtime()->emptyString;
    return NewStringCopyZ<CanGC>(cx, s);
}

JS_PUBLIC_API(bool)
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)
{
    MOZ_ASSERT(str);
    MOZ_ASSERT(((size_t)str & JSID_TYPE_MASK) == 0);
    MOZ_ASSERT_IF(cx, JS_StringHasBeenInterned(cx, str));
    return AtomToId(&str->asAtom());
}

JS_PUBLIC_API(JSString *)
JS_InternJSString(JSContext *cx, HandleString str)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JSAtom *atom = AtomizeString(cx, str, InternAtom);
    MOZ_ASSERT_IF(atom, JS_StringHasBeenInterned(cx, atom));
    return atom;
}

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

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

JS_PUBLIC_API(JSString *)
JS_NewUCString(JSContext *cx, char16_t *chars, size_t length)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return NewString<CanGC>(cx, chars, length);
}

JS_PUBLIC_API(JSString *)
JS_NewUCStringCopyN(JSContext *cx, const char16_t *s, size_t n)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (!n)
        return cx->names().empty;
    return NewStringCopyN<CanGC>(cx, s, n);
}

JS_PUBLIC_API(JSString *)
JS_NewUCStringCopyZ(JSContext *cx, const char16_t *s)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (!s)
        return cx->runtime()->emptyString;
    return NewStringCopyZ<CanGC>(cx, s);
}

JS_PUBLIC_API(JSString *)
JS_InternUCStringN(JSContext *cx, const char16_t *s, size_t length)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    JSAtom *atom = AtomizeChars(cx, s, length, InternAtom);
    MOZ_ASSERT_IF(atom, JS_StringHasBeenInterned(cx, atom));
    return atom;
}

JS_PUBLIC_API(JSString *)
JS_InternUCString(JSContext *cx, const char16_t *s)
{
    return JS_InternUCStringN(cx, s, js_strlen(s));
}

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

JS_PUBLIC_API(bool)
JS_StringIsFlat(JSString *str)
{
    return str->isFlat();
}

JS_PUBLIC_API(bool)
JS_StringHasLatin1Chars(JSString *str)
{
    return str->hasLatin1Chars();
}

JS_PUBLIC_API(const JS::Latin1Char *)
JS_GetLatin1StringCharsAndLength(JSContext *cx, const JS::AutoCheckCannotGC &nogc, JSString *str,
                                 size_t *plength)
{
    MOZ_ASSERT(plength);
    AssertHeapIsIdleOrStringIsFlat(cx, str);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, str);
    JSLinearString *linear = str->ensureLinear(cx);
    if (!linear)
        return nullptr;
    *plength = linear->length();
    return linear->latin1Chars(nogc);
}

JS_PUBLIC_API(const char16_t *)
JS_GetTwoByteStringCharsAndLength(JSContext *cx, const JS::AutoCheckCannotGC &nogc, JSString *str,
                                  size_t *plength)
{
    MOZ_ASSERT(plength);
    AssertHeapIsIdleOrStringIsFlat(cx, str);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, str);
    JSLinearString *linear = str->ensureLinear(cx);
    if (!linear)
        return nullptr;
    *plength = linear->length();
    return linear->twoByteChars(nogc);
}

JS_PUBLIC_API(const char16_t *)
JS_GetTwoByteExternalStringChars(JSString *str)
{
    return str->asExternal().twoByteChars();
}

JS_PUBLIC_API(bool)
JS_GetStringCharAt(JSContext *cx, JSString *str, size_t index, char16_t *res)
{
    AssertHeapIsIdleOrStringIsFlat(cx, str);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, str);

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

    *res = linear->latin1OrTwoByteChar(index);
    return true;
}

JS_PUBLIC_API(char16_t)
JS_GetFlatStringCharAt(JSFlatString *str, size_t index)
{
    return str->latin1OrTwoByteChar(index);
}

JS_PUBLIC_API(bool)
JS_CopyStringChars(JSContext *cx, mozilla::Range<char16_t> dest, JSString *str)
{
    AssertHeapIsIdleOrStringIsFlat(cx, str);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, str);

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

    MOZ_ASSERT(linear->length() <= dest.length());
    CopyChars(dest.start().get(), *linear);
    return true;
}

JS_PUBLIC_API(const Latin1Char *)
JS_GetLatin1InternedStringChars(const JS::AutoCheckCannotGC &nogc, JSString *str)
{
    MOZ_ASSERT(str->isAtom());
    JSFlatString *flat = str->ensureFlat(nullptr);
    if (!flat)
        return nullptr;
    return flat->latin1Chars(nogc);
}

JS_PUBLIC_API(const char16_t *)
JS_GetTwoByteInternedStringChars(const JS::AutoCheckCannotGC &nogc, JSString *str)
{
    MOZ_ASSERT(str->isAtom());
    JSFlatString *flat = str->ensureFlat(nullptr);
    if (!flat)
        return nullptr;
    return flat->twoByteChars(nogc);
}

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

extern JS_PUBLIC_API(const Latin1Char *)
JS_GetLatin1FlatStringChars(const JS::AutoCheckCannotGC &nogc, JSFlatString *str)
{
    return str->latin1Chars(nogc);
}

extern JS_PUBLIC_API(const char16_t *)
JS_GetTwoByteFlatStringChars(const JS::AutoCheckCannotGC &nogc, JSFlatString *str)
{
    return str->twoByteChars(nogc);
}

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

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

JS_PUBLIC_API(bool)
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)
{
    AssertHeapIsIdle(cx);
    JSLinearString *linearStr = str->ensureLinear(cx);
    if (!linearStr)
        return size_t(-1);
    return PutEscapedString(buffer, size, linearStr, quote);
}

JS_PUBLIC_API(bool)
JS_FileEscapedString(FILE *fp, JSString *str, char quote)
{
    JSLinearString *linearStr = str->ensureLinear(nullptr);
    return linearStr && FileEscapedString(fp, linearStr, quote);
}

JS_PUBLIC_API(JSString *)
JS_NewDependentString(JSContext *cx, HandleString str, size_t start, size_t length)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return NewDependentString(cx, str, start, length);
}

JS_PUBLIC_API(JSString *)
JS_ConcatStrings(JSContext *cx, HandleString left, HandleString right)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return ConcatStrings<CanGC>(cx, left, right);
}

JS_PUBLIC_API(bool)
JS_DecodeBytes(JSContext *cx, const char *src, size_t srclen, char16_t *dst, size_t *dstlenp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    if (!dst) {
        *dstlenp = srclen;
        return true;
    }

    size_t dstlen = *dstlenp;

    if (srclen > dstlen) {
        CopyAndInflateChars(dst, src, dstlen);

        AutoSuppressGC suppress(cx);
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_BUFFER_TOO_SMALL);
        return false;
    }

    CopyAndInflateChars(dst, src, srclen);
    *dstlenp = srclen;
    return true;
}

static char *
EncodeLatin1(ExclusiveContext *cx, JSString *str)
{
    JSLinearString *linear = str->ensureLinear(cx);
    if (!linear)
        return nullptr;

    JS::AutoCheckCannotGC nogc;
    if (linear->hasTwoByteChars())
        return JS::LossyTwoByteCharsToNewLatin1CharsZ(cx, linear->twoByteRange(nogc)).c_str();

    size_t len = str->length();
    Latin1Char *buf = cx->pod_malloc<Latin1Char>(len + 1);
    if (!buf)
        return nullptr;

    mozilla::PodCopy(buf, linear->latin1Chars(nogc), len);
    buf[len] = '\0';
    return reinterpret_cast<char*>(buf);
}

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

    return EncodeLatin1(cx, str);
}

JS_PUBLIC_API(char *)
JS_EncodeStringToUTF8(JSContext *cx, HandleString str)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

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

    JS::AutoCheckCannotGC nogc;
    return linear->hasLatin1Chars()
           ? JS::CharsToNewUTF8CharsZ(cx, linear->latin1Range(nogc)).c_str()
           : JS::CharsToNewUTF8CharsZ(cx, linear->twoByteRange(nogc)).c_str();
}

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

    if (!str->ensureLinear(cx))
        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;
    JSLinearString *linear = str->ensureLinear(cx);
    if (!linear)
         return size_t(-1);

    bool res;
    if (linear->hasLatin1Chars()) {
        JS::AutoCheckCannotGC nogc;
        res = DeflateStringToBuffer(nullptr, linear->latin1Chars(nogc), linear->length(), buffer,
                                    &writtenLength);
    } else {
        JS::AutoCheckCannotGC nogc;
        res = DeflateStringToBuffer(nullptr, linear->twoByteChars(nogc), linear->length(), buffer,
                                    &writtenLength);
    }
    if (res) {
        MOZ_ASSERT(writtenLength <= length);
        return writtenLength;
    }
    MOZ_ASSERT(writtenLength <= length);
    size_t necessaryLength = str->length();
    if (necessaryLength == size_t(-1))
        return size_t(-1);
    MOZ_ASSERT(writtenLength == length); // C strings are NOT encoded.
    return necessaryLength;
}

JS_PUBLIC_API(JS::Symbol *)
JS::NewSymbol(JSContext *cx, HandleString description)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (description)
        assertSameCompartment(cx, description);

    return Symbol::new_(cx, SymbolCode::UniqueSymbol, description);
}

JS_PUBLIC_API(JS::Symbol *)
JS::GetSymbolFor(JSContext *cx, HandleString key)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, key);

    return Symbol::for_(cx, key);
}

JS_PUBLIC_API(JSString *)
JS::GetSymbolDescription(HandleSymbol symbol)
{
    return symbol->description();
}

JS_PUBLIC_API(JS::SymbolCode)
JS::GetSymbolCode(Handle<Symbol*> symbol)
{
    return symbol->code();
}

JS_PUBLIC_API(JS::Symbol *)
JS::GetWellKnownSymbol(JSContext *cx, JS::SymbolCode which)
{
    return cx->wellKnownSymbols().get(uint32_t(which));
}

#ifdef DEBUG
static bool
PropertySpecNameIsDigits(const char *s) {
    if (JS::PropertySpecNameIsSymbol(s))
        return false;
    if (!*s)
        return false;
    for (; *s; s++) {
        if (*s < '0' || *s > '9')
            return false;
    }
    return true;
}
#endif // DEBUG

JS_PUBLIC_API(bool)
JS::PropertySpecNameEqualsId(const char *name, HandleId id)
{
    if (JS::PropertySpecNameIsSymbol(name)) {
        if (!JSID_IS_SYMBOL(id))
            return false;
        Symbol *sym = JSID_TO_SYMBOL(id);
        return sym->isWellKnownSymbol() && sym->code() == PropertySpecNameToSymbolCode(name);
    }

    MOZ_ASSERT(!PropertySpecNameIsDigits(name));
    return JSID_IS_ATOM(id) && JS_FlatStringEqualsAscii(JSID_TO_ATOM(id), name);
}

JS_PUBLIC_API(bool)
JS_Stringify(JSContext *cx, MutableHandleValue vp, HandleObject replacer,
             HandleValue space, JSONWriteCallback callback, void *data)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, replacer, space);
    StringBuffer sb(cx);
    if (!sb.ensureTwoByteChars())
        return false;
    if (!Stringify(cx, vp, replacer, space, sb))
        return false;
    if (sb.empty() && !sb.append(cx->names().null))
        return false;
    return callback(sb.rawTwoByteBegin(), sb.length(), data);
}

JS_PUBLIC_API(bool)
JS_ParseJSON(JSContext *cx, const char16_t *chars, uint32_t len, MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return ParseJSONWithReviver(cx, mozilla::Range<const char16_t>(chars, len), NullHandleValue, vp);
}

JS_PUBLIC_API(bool)
JS_ParseJSON(JSContext *cx, HandleString str, MutableHandleValue vp)
{
    return JS_ParseJSONWithReviver(cx, str, NullHandleValue, vp);
}

JS_PUBLIC_API(bool)
JS_ParseJSONWithReviver(JSContext *cx, const char16_t *chars, uint32_t len, HandleValue reviver, MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return ParseJSONWithReviver(cx, mozilla::Range<const char16_t>(chars, len), reviver, vp);
}

JS_PUBLIC_API(bool)
JS_ParseJSONWithReviver(JSContext *cx, HandleString str, HandleValue reviver, MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, str);

    AutoStableStringChars stableChars(cx);
    if (!stableChars.init(cx, str))
        return false;

    return stableChars.isLatin1()
           ? ParseJSONWithReviver(cx, stableChars.latin1Range(), reviver, vp)
           : ParseJSONWithReviver(cx, stableChars.twoByteRange(), reviver, vp);
}

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

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

    AssertHeapIsIdle(cx);
    va_start(ap, format);
    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);
    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);
    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 char16_t **args)
{
    AssertHeapIsIdle(cx);
    ReportErrorNumberUCArray(cx, JSREPORT_ERROR, errorCallback, userRef,
                             errorNumber, args);
}

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

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

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

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

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

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

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

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

JS_PUBLIC_API(JSErrorReporter)
JS_GetErrorReporter(JSRuntime *rt)
{
    return rt->errorReporter;
}

JS_PUBLIC_API(JSErrorReporter)
JS_SetErrorReporter(JSRuntime *rt, JSErrorReporter er)
{
    JSErrorReporter older;

    older = rt->errorReporter;
    rt->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)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return NewDateObject(cx, year, mon, mday, hour, min, sec);
}

JS_PUBLIC_API(JSObject *)
JS_NewDateObjectMsec(JSContext *cx, double msec)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return NewDateObjectMsec(cx, msec);
}

JS_PUBLIC_API(bool)
JS_ObjectIsDate(JSContext *cx, HandleObject obj)
{
    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, HandleObject obj, const char *bytes, size_t length, unsigned flags)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    ScopedJSFreePtr<char16_t> chars(InflateString(cx, bytes, &length));
    if (!chars)
        return nullptr;

    RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics(cx);
    if (!res)
        return nullptr;

    RegExpObject *reobj = RegExpObject::create(cx, res, chars, length,
                                               RegExpFlag(flags), nullptr, cx->tempLifoAlloc());
    return reobj;
}

JS_PUBLIC_API(JSObject *)
JS_NewUCRegExpObject(JSContext *cx, HandleObject obj, const char16_t *chars, size_t length,
                     unsigned flags)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics(cx);
    if (!res)
        return nullptr;

    return RegExpObject::create(cx, res, chars, length,
                                RegExpFlag(flags), nullptr, cx->tempLifoAlloc());
}

JS_PUBLIC_API(bool)
JS_SetRegExpInput(JSContext *cx, HandleObject obj, HandleString input, bool multiline)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, input);

    RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics(cx);
    if (!res)
        return false;

    res->reset(cx, input, !!multiline);
    return true;
}

JS_PUBLIC_API(bool)
JS_ClearRegExpStatics(JSContext *cx, HandleObject obj)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    MOZ_ASSERT(obj);

    RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics(cx);
    if (!res)
        return false;

    res->clear();
    return true;
}

JS_PUBLIC_API(bool)
JS_ExecuteRegExp(JSContext *cx, HandleObject obj, HandleObject reobj, char16_t *chars,
                 size_t length, size_t *indexp, bool test, MutableHandleValue rval)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics(cx);
    if (!res)
        return false;

    RootedLinearString input(cx, NewStringCopyN<CanGC>(cx, chars, length));
    if (!input)
        return false;

    return ExecuteRegExpLegacy(cx, res, reobj->as<RegExpObject>(), input, indexp, test, rval);
}

JS_PUBLIC_API(JSObject *)
JS_NewRegExpObjectNoStatics(JSContext *cx, char *bytes, size_t length, unsigned flags)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    char16_t *chars = InflateString(cx, bytes, &length);
    if (!chars)
        return nullptr;
    RegExpObject *reobj = RegExpObject::createNoStatics(cx, chars, length,
                                                        RegExpFlag(flags), nullptr, cx->tempLifoAlloc());
    js_free(chars);
    return reobj;
}

JS_PUBLIC_API(JSObject *)
JS_NewUCRegExpObjectNoStatics(JSContext *cx, char16_t *chars, size_t length, unsigned flags)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    return RegExpObject::createNoStatics(cx, chars, length,
                                         RegExpFlag(flags), nullptr, cx->tempLifoAlloc());
}

JS_PUBLIC_API(bool)
JS_ExecuteRegExpNoStatics(JSContext *cx, HandleObject obj, char16_t *chars, size_t length,
                          size_t *indexp, bool test, MutableHandleValue rval)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RootedLinearString input(cx, NewStringCopyN<CanGC>(cx, chars, length));
    if (!input)
        return false;

    return ExecuteRegExpLegacy(cx, nullptr, obj->as<RegExpObject>(), input, indexp, test,
                               rval);
}

JS_PUBLIC_API(bool)
JS_ObjectIsRegExp(JSContext *cx, HandleObject obj)
{
    assertSameCompartment(cx, obj);
    return ObjectClassIs(obj, ESClass_RegExp, cx);
}

JS_PUBLIC_API(unsigned)
JS_GetRegExpFlags(JSContext *cx, HandleObject obj)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RegExpGuard shared(cx);
    if (!RegExpToShared(cx, obj, &shared))
        return false;
    return shared.re()->getFlags();
}

JS_PUBLIC_API(JSString *)
JS_GetRegExpSource(JSContext *cx, HandleObject obj)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    RegExpGuard shared(cx);
    if (!RegExpToShared(cx, obj, &shared))
        return nullptr;
    return shared.re()->getSource();
}

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

JS_PUBLIC_API(bool)
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, const JSLocaleCallbacks *callbacks)
{
    AssertHeapIsIdle(rt);
    rt->localeCallbacks = callbacks;
}

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

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

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

JS_PUBLIC_API(bool)
JS_GetPendingException(JSContext *cx, MutableHandleValue vp)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (!cx->isExceptionPending())
        return false;
    return cx->getPendingException(vp);
}

JS_PUBLIC_API(void)
JS_SetPendingException(JSContext *cx, HandleValue value)
{
    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(bool)
JS_ReportPendingException(JSContext *cx)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);

    // This can only fail due to oom.
    bool ok = ReportUncaughtException(cx);
    MOZ_ASSERT(!cx->isExceptionPending());
    return ok;
}

JS::AutoSaveExceptionState::AutoSaveExceptionState(JSContext *cx)
  : context(cx),
    wasPropagatingForcedReturn(cx->propagatingForcedReturn_),
    wasOverRecursed(cx->overRecursed_),
    wasThrowing(cx->throwing),
    exceptionValue(cx)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    if (wasPropagatingForcedReturn)
        cx->clearPropagatingForcedReturn();
    if (wasOverRecursed)
        cx->overRecursed_ = false;
    if (wasThrowing) {
        exceptionValue = cx->unwrappedException_;
        cx->clearPendingException();
    }
}

void
JS::AutoSaveExceptionState::restore()
{
    context->propagatingForcedReturn_ = wasPropagatingForcedReturn;
    context->overRecursed_ = wasOverRecursed;
    context->throwing = wasThrowing;
    context->unwrappedException_ = exceptionValue;
    drop();
}

JS::AutoSaveExceptionState::~AutoSaveExceptionState()
{
    if (!context->isExceptionPending()) {
        if (wasPropagatingForcedReturn)
            context->setPropagatingForcedReturn();
        if (wasThrowing) {
            context->overRecursed_ = wasOverRecursed;
            context->throwing = true;
            context->unwrappedException_ = exceptionValue;
        }
    }
}

struct JSExceptionState {
    explicit JSExceptionState(JSContext *cx) : exception(cx) {}
    bool throwing;
    PersistentRootedValue exception;
};

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

    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    state = cx->new_<JSExceptionState>(cx);
    if (state)
        state->throwing = JS_GetPendingException(cx, &state->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);
    js_delete(state);
}

JS_PUBLIC_API(JSErrorReport *)
JS_ErrorFromException(JSContext *cx, HandleObject obj)
{
    AssertHeapIsIdle(cx);
    CHECK_REQUEST(cx);
    assertSameCompartment(cx, obj);
    return ErrorFromException(cx, obj);
}

JS_PUBLIC_API(bool)
JS_ThrowStopIteration(JSContext *cx)
{
    AssertHeapIsIdle(cx);
    return ThrowStopIteration(cx);
}

JS_PUBLIC_API(bool)
JS_IsStopIteration(jsval v)
{
    return v.isObject() && v.toObject().is<StopIterationObject>();
}

JS_PUBLIC_API(intptr_t)
JS_GetCurrentThread()
{
    return reinterpret_cast<intptr_t>(PR_GetCurrentThread());
}

extern MOZ_NEVER_INLINE JS_PUBLIC_API(void)
JS_AbortIfWrongThread(JSRuntime *rt)
{
    if (!CurrentThreadCanAccessRuntime(rt))
        MOZ_CRASH();
    if (!js::TlsPerThreadData.get()->associatedWith(rt))
        MOZ_CRASH();
}

#ifdef JS_GC_ZEAL
JS_PUBLIC_API(void)
JS_GetGCZeal(JSContext *cx, uint8_t *zeal, uint32_t *frequency, uint32_t *nextScheduled)
{
    cx->runtime()->gc.getZeal(zeal, frequency, nextScheduled);
}

JS_PUBLIC_API(void)
JS_SetGCZeal(JSContext *cx, uint8_t zeal, uint32_t frequency)
{
    cx->runtime()->gc.setZeal(zeal, frequency);
}

JS_PUBLIC_API(void)
JS_ScheduleGC(JSContext *cx, uint32_t count)
{
    cx->runtime()->gc.setNextScheduled(count);
}
#endif

JS_PUBLIC_API(void)
JS_SetParallelParsingEnabled(JSRuntime *rt, bool enabled)
{
    rt->setParallelParsingEnabled(enabled);
}

JS_PUBLIC_API(void)
JS_SetOffthreadIonCompilationEnabled(JSRuntime *rt, bool enabled)
{
    rt->setOffthreadIonCompilationEnabled(enabled);
}

JS_PUBLIC_API(void)
JS_SetGlobalJitCompilerOption(JSRuntime *rt, JSJitCompilerOption opt, uint32_t value)
{
    switch (opt) {
      case JSJITCOMPILER_BASELINE_WARMUP_TRIGGER:
        if (value == uint32_t(-1)) {
            jit::JitOptions defaultValues;
            value = defaultValues.baselineWarmUpThreshold;
        }
        jit::js_JitOptions.baselineWarmUpThreshold = value;
        break;
      case JSJITCOMPILER_ION_WARMUP_TRIGGER:
        if (value == uint32_t(-1)) {
            jit::js_JitOptions.resetCompilerWarmUpThreshold();
            break;
        }
        jit::js_JitOptions.setCompilerWarmUpThreshold(value);
        if (value == 0)
            jit::js_JitOptions.setEagerCompilation();
        break;
      case JSJITCOMPILER_ION_GVN_ENABLE:
        if (value == 0) {
            jit::js_JitOptions.enableGvn(false);
            JitSpew(js::jit::JitSpew_IonScripts, "Disable ion's GVN");
        } else {
            jit::js_JitOptions.enableGvn(true);
            JitSpew(js::jit::JitSpew_IonScripts, "Enable ion's GVN");
        }
        break;
      case JSJITCOMPILER_ION_ENABLE:
        if (value == 1) {
            JS::RuntimeOptionsRef(rt).setIon(true);
            JitSpew(js::jit::JitSpew_IonScripts, "Enable ion");
        } else if (value == 0) {
            JS::RuntimeOptionsRef(rt).setIon(false);
            JitSpew(js::jit::JitSpew_IonScripts, "Disable ion");
        }
        break;
      case JSJITCOMPILER_BASELINE_ENABLE:
        if (value == 1) {
            JS::RuntimeOptionsRef(rt).setBaseline(true);
            ReleaseAllJITCode(rt->defaultFreeOp());
            JitSpew(js::jit::JitSpew_BaselineScripts, "Enable baseline");
        } else if (value == 0) {
            JS::RuntimeOptionsRef(rt).setBaseline(false);
            ReleaseAllJITCode(rt->defaultFreeOp());
            JitSpew(js::jit::JitSpew_BaselineScripts, "Disable baseline");
        }
        break;
      case JSJITCOMPILER_OFFTHREAD_COMPILATION_ENABLE:
        if (value == 1) {
            rt->setOffthreadIonCompilationEnabled(true);
            JitSpew(js::jit::JitSpew_IonScripts, "Enable offthread compilation");
        } else if (value == 0) {
            rt->setOffthreadIonCompilationEnabled(false);
            JitSpew(js::jit::JitSpew_IonScripts, "Disable offthread compilation");
        }
        break;
      case JSJITCOMPILER_SIGNALS_ENABLE:
        if (value == 1) {
            rt->setCanUseSignalHandlers(true);
            JitSpew(js::jit::JitSpew_IonScripts, "Enable signals");
        } else if (value == 0) {
            rt->setCanUseSignalHandlers(false);
            JitSpew(js::jit::JitSpew_IonScripts, "Disable signals");
        }
        break;
      default:
        break;
    }
}

JS_PUBLIC_API(int)
JS_GetGlobalJitCompilerOption(JSRuntime *rt, JSJitCompilerOption opt)
{
#ifndef JS_CODEGEN_NONE
    switch (opt) {
      case JSJITCOMPILER_BASELINE_WARMUP_TRIGGER:
        return jit::js_JitOptions.baselineWarmUpThreshold;
      case JSJITCOMPILER_ION_WARMUP_TRIGGER:
        return jit::js_JitOptions.forcedDefaultIonWarmUpThreshold.isSome()
             ? jit::js_JitOptions.forcedDefaultIonWarmUpThreshold.ref()
             : jit::OptimizationInfo::CompilerWarmupThreshold;
      case JSJITCOMPILER_ION_ENABLE:
        return JS::RuntimeOptionsRef(rt).ion();
      case JSJITCOMPILER_BASELINE_ENABLE:
        return JS::RuntimeOptionsRef(rt).baseline();
      case JSJITCOMPILER_OFFTHREAD_COMPILATION_ENABLE:
        return rt->canUseOffthreadIonCompilation();
      case JSJITCOMPILER_SIGNALS_ENABLE:
        return rt->canUseSignalHandlers();
      default:
        break;
    }
#endif
    return 0;
}

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

#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,