Add m-esr52 at 52.6.0

1 files changed, 6867 insertions, 0 deletions

diff --git a/js/src/jsapi.cpp b/js/src/jsapi.cpp
new file mode 100644
index 0000000000..a99d08951a
--- /dev/null
+++ b/js/src/jsapi.cpp
@@ -0,0 +1,6867 @@
+/* -*- 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/Sprintf.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 "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 "builtin/AtomicsObject.h"
+#include "builtin/Eval.h"
+#include "builtin/Intl.h"
+#include "builtin/MapObject.h"
+#include "builtin/Promise.h"
+#include "builtin/RegExp.h"
+#include "builtin/SymbolObject.h"
+#ifdef ENABLE_SIMD
+# include "builtin/SIMD.h"
+#endif
+#ifdef ENABLE_BINARYDATA
+# 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 "gc/Policy.h"
+#include "jit/JitCommon.h"
+#include "js/CharacterEncoding.h"
+#include "js/Conversions.h"
+#include "js/Date.h"
+#include "js/Initialization.h"
+#include "js/Proxy.h"
+#include "js/SliceBudget.h"
+#include "js/StructuredClone.h"
+#include "js/UniquePtr.h"
+#include "js/Utility.h"
+#include "vm/AsyncFunction.h"
+#include "vm/DateObject.h"
+#include "vm/Debugger.h"
+#include "vm/EnvironmentObject.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/SelfHosting.h"
+#include "vm/Shape.h"
+#include "vm/StopIterationObject.h"
+#include "vm/String.h"
+#include "vm/StringBuffer.h"
+#include "vm/Symbol.h"
+#include "vm/TypedArrayCommon.h"
+#include "vm/WrapperObject.h"
+#include "vm/Xdr.h"
+#include "wasm/AsmJS.h"
+#include "wasm/WasmModule.h"
+
+#include "jsatominlines.h"
+#include "jsfuninlines.h"
+#include "jsscriptinlines.h"
+
+#include "vm/Interpreter-inl.h"
+#include "vm/NativeObject-inl.h"
+#include "vm/SavedStacks-inl.h"
+#include "vm/String-inl.h"
+
+using namespace js;
+using namespace js::gc;
+
+using mozilla::Maybe;
+using mozilla::PodCopy;
+using mozilla::PodZero;
+
+using JS::AutoGCRooter;
+using JS::ToInt32;
+using JS::ToInteger;
+using JS::ToUint32;
+
+#ifdef HAVE_VA_LIST_AS_ARRAY
+#define JS_ADDRESSOF_VA_LIST(ap) ((va_list*)(ap))
+#else
+#define JS_ADDRESSOF_VA_LIST(ap) (&(ap))
+#endif
+
+JS_PUBLIC_API(bool)
+JS::CallArgs::requireAtLeast(JSContext* cx, const char* fnname, unsigned required) const
+{
+    if (length() < required) {
+        char numArgsStr[40];
+        SprintfLiteral(numArgsStr, "%u", required - 1);
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
+                                  fnname, numArgsStr, required == 2 ? "" : "s");
+        return false;
+    }
+
+    return true;
+}
+
+static bool
+ErrorTakesArguments(unsigned msg)
+{
+    MOZ_ASSERT(msg < JSErr_Limit);
+    unsigned argCount = js_ErrorFormatString[msg].argCount;
+    MOZ_ASSERT(argCount <= 2);
+    return argCount == 1 || argCount == 2;
+}
+
+static bool
+ErrorTakesObjectArgument(unsigned msg)
+{
+    MOZ_ASSERT(msg < JSErr_Limit);
+    unsigned argCount = js_ErrorFormatString[msg].argCount;
+    MOZ_ASSERT(argCount <= 2);
+    return argCount == 2;
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::reportStrictErrorOrWarning(JSContext* cx, HandleObject obj, HandleId id,
+                                               bool strict)
+{
+    static_assert(unsigned(OkCode) == unsigned(JSMSG_NOT_AN_ERROR),
+                  "unsigned value of OkCode must not be an error code");
+    MOZ_ASSERT(code_ != Uninitialized);
+    MOZ_ASSERT(!ok());
+
+    unsigned flags = strict ? JSREPORT_ERROR : (JSREPORT_WARNING | JSREPORT_STRICT);
+    if (code_ == JSMSG_OBJECT_NOT_EXTENSIBLE || code_ == JSMSG_SET_NON_OBJECT_RECEIVER) {
+        RootedValue val(cx, ObjectValue(*obj));
+        return ReportValueErrorFlags(cx, flags, code_, JSDVG_IGNORE_STACK, val,
+                                     nullptr, nullptr, nullptr);
+    }
+    if (ErrorTakesArguments(code_)) {
+        RootedValue idv(cx, IdToValue(id));
+        RootedString str(cx, ValueToSource(cx, idv));
+        if (!str)
+            return false;
+
+        JSAutoByteString propName;
+        if (!propName.encodeUtf8(cx, str))
+            return false;
+
+        if (ErrorTakesObjectArgument(code_)) {
+            return JS_ReportErrorFlagsAndNumberUTF8(cx, flags, GetErrorMessage, nullptr, code_,
+                                                    obj->getClass()->name, propName.ptr());
+        }
+
+        return JS_ReportErrorFlagsAndNumberUTF8(cx, flags, GetErrorMessage, nullptr, code_,
+                                                propName.ptr());
+    }
+    return JS_ReportErrorFlagsAndNumberASCII(cx, flags, GetErrorMessage, nullptr, code_);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::reportStrictErrorOrWarning(JSContext* cx, HandleObject obj, bool strict)
+{
+    MOZ_ASSERT(code_ != Uninitialized);
+    MOZ_ASSERT(!ok());
+    MOZ_ASSERT(!ErrorTakesArguments(code_));
+
+    unsigned flags = strict ? JSREPORT_ERROR : (JSREPORT_WARNING | JSREPORT_STRICT);
+    return JS_ReportErrorFlagsAndNumberASCII(cx, flags, GetErrorMessage, nullptr, code_);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failCantRedefineProp()
+{
+    return fail(JSMSG_CANT_REDEFINE_PROP);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failReadOnly()
+{
+    return fail(JSMSG_READ_ONLY);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failGetterOnly()
+{
+    return fail(JSMSG_GETTER_ONLY);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failCantDelete()
+{
+    return fail(JSMSG_CANT_DELETE);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failCantSetInterposed()
+{
+    return fail(JSMSG_CANT_SET_INTERPOSED);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failCantDefineWindowElement()
+{
+    return fail(JSMSG_CANT_DEFINE_WINDOW_ELEMENT);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failCantDeleteWindowElement()
+{
+    return fail(JSMSG_CANT_DELETE_WINDOW_ELEMENT);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failCantDeleteWindowNamedProperty()
+{
+    return fail(JSMSG_CANT_DELETE_WINDOW_NAMED_PROPERTY);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failCantPreventExtensions()
+{
+    return fail(JSMSG_CANT_PREVENT_EXTENSIONS);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failCantSetProto()
+{
+    return fail(JSMSG_CANT_SET_PROTO);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failNoNamedSetter()
+{
+    return fail(JSMSG_NO_NAMED_SETTER);
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectOpResult::failNoIndexedSetter()
+{
+    return fail(JSMSG_NO_INDEXED_SETTER);
+}
+
+JS_PUBLIC_API(int64_t)
+JS_Now()
+{
+    return PRMJ_Now();
+}
+
+JS_PUBLIC_API(Value)
+JS_GetNaNValue(JSContext* cx)
+{
+    return cx->runtime()->NaNValue;
+}
+
+JS_PUBLIC_API(Value)
+JS_GetNegativeInfinityValue(JSContext* cx)
+{
+    return cx->runtime()->negativeInfinityValue;
+}
+
+JS_PUBLIC_API(Value)
+JS_GetPositiveInfinityValue(JSContext* cx)
+{
+    return cx->runtime()->positiveInfinityValue;
+}
+
+JS_PUBLIC_API(Value)
+JS_GetEmptyStringValue(JSContext* cx)
+{
+    return StringValue(cx->runtime()->emptyString);
+}
+
+JS_PUBLIC_API(JSString*)
+JS_GetEmptyString(JSContext* cx)
+{
+    MOZ_ASSERT(cx->emptyString());
+    return cx->emptyString();
+}
+
+namespace js {
+
+void
+AssertHeapIsIdle(JSRuntime* rt)
+{
+    MOZ_ASSERT(!rt->isHeapBusy());
+}
+
+} // namespace js
+
+static void
+AssertHeapIsIdleOrIterating(JSRuntime* rt)
+{
+    MOZ_ASSERT(!rt->isHeapCollecting());
+}
+
+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();
+}
+
+JS_PUBLIC_API(bool)
+JS_IsFunctionBound(JSFunction* fun)
+{
+    return fun->isBoundFunction();
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetBoundFunctionTarget(JSFunction* fun)
+{
+    return fun->isBoundFunction() ?
+               fun->getBoundFunctionTarget() : nullptr;
+}
+
+/************************************************************************/
+
+#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(JSContext*)
+JS_NewContext(uint32_t maxbytes, uint32_t maxNurseryBytes, JSContext* parentContext)
+{
+    MOZ_ASSERT(JS::detail::libraryInitState == JS::detail::InitState::Running,
+               "must call JS_Init prior to creating any JSContexts");
+
+    // Make sure that all parent runtimes are the topmost parent.
+    JSRuntime* parentRuntime = nullptr;
+    if (parentContext) {
+        parentRuntime = parentContext->runtime();
+        while (parentRuntime && parentRuntime->parentRuntime)
+            parentRuntime = parentRuntime->parentRuntime;
+    }
+
+    return NewContext(maxbytes, maxNurseryBytes, parentRuntime);
+}
+
+JS_PUBLIC_API(void)
+JS_DestroyContext(JSContext* cx)
+{
+    DestroyContext(cx);
+}
+
+static JS_CurrentEmbedderTimeFunction currentEmbedderTimeFunction;
+
+JS_PUBLIC_API(void)
+JS_SetCurrentEmbedderTimeFunction(JS_CurrentEmbedderTimeFunction timeFn)
+{
+    currentEmbedderTimeFunction = timeFn;
+}
+
+JS_PUBLIC_API(double)
+JS_GetCurrentEmbedderTime()
+{
+    if (currentEmbedderTimeFunction)
+        return currentEmbedderTimeFunction();
+    return PRMJ_Now() / static_cast<double>(PRMJ_USEC_PER_MSEC);
+}
+
+JS_PUBLIC_API(void*)
+JS_GetContextPrivate(JSContext* cx)
+{
+    return cx->data;
+}
+
+JS_PUBLIC_API(void)
+JS_SetContextPrivate(JSContext* cx, void* data)
+{
+    cx->data = data;
+}
+
+JS_PUBLIC_API(void)
+JS_SetFutexCanWait(JSContext* cx)
+{
+    cx->fx.setCanWait(true);
+}
+
+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(JSContext*)
+JS_GetParentContext(JSContext* cx)
+{
+    return cx->parentRuntime ? cx->parentRuntime->unsafeContextFromAnyThread() : cx;
+}
+
+JS_PUBLIC_API(JSVersion)
+JS_GetVersion(JSContext* cx)
+{
+    return VersionNumber(cx->findVersion());
+}
+
+JS_PUBLIC_API(void)
+JS_SetVersionForCompartment(JSCompartment* compartment, JSVersion version)
+{
+    compartment->behaviors().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::ContextOptions&)
+JS::ContextOptionsRef(JSContext* cx)
+{
+    return cx->options();
+}
+
+JS_PUBLIC_API(bool)
+JS::InitSelfHostedCode(JSContext* cx)
+{
+    MOZ_RELEASE_ASSERT(!cx->runtime()->hasInitializedSelfHosting(),
+                       "JS::InitSelfHostedCode() called more than once");
+
+    JSRuntime* rt = cx->runtime();
+
+    JSAutoRequest ar(cx);
+    if (!rt->initializeAtoms(cx))
+        return false;
+
+    if (!cx->cycleDetectorSet.init())
+        return false;
+
+    if (!rt->initSelfHosting(cx))
+        return false;
+
+    if (!rt->parentRuntime && !rt->transformToPermanentAtoms(cx))
+        return false;
+
+    return true;
+}
+
+JS_PUBLIC_API(const char*)
+JS_GetImplementationVersion(void)
+{
+    return "JavaScript-C" MOZILLA_VERSION;
+}
+
+JS_PUBLIC_API(void)
+JS_SetDestroyCompartmentCallback(JSContext* cx, JSDestroyCompartmentCallback callback)
+{
+    cx->destroyCompartmentCallback = callback;
+}
+
+JS_PUBLIC_API(void)
+JS_SetSizeOfIncludingThisCompartmentCallback(JSContext* cx,
+                                             JSSizeOfIncludingThisCompartmentCallback callback)
+{
+    cx->sizeOfIncludingThisCompartmentCallback = callback;
+}
+
+JS_PUBLIC_API(void)
+JS_SetDestroyZoneCallback(JSContext* cx, JSZoneCallback callback)
+{
+    cx->destroyZoneCallback = callback;
+}
+
+JS_PUBLIC_API(void)
+JS_SetSweepZoneCallback(JSContext* cx, JSZoneCallback callback)
+{
+    cx->sweepZoneCallback = callback;
+}
+
+JS_PUBLIC_API(void)
+JS_SetCompartmentNameCallback(JSContext* cx, JSCompartmentNameCallback callback)
+{
+    cx->compartmentNameCallback = callback;
+}
+
+JS_PUBLIC_API(void)
+JS_SetWrapObjectCallbacks(JSContext* cx, const JSWrapObjectCallbacks* callbacks)
+{
+    cx->wrapObjectCallbacks = callbacks;
+}
+
+JS_PUBLIC_API(JSCompartment*)
+JS_EnterCompartment(JSContext* cx, JSObject* target)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    MOZ_ASSERT(!JS::ObjectIsMarkedGray(target));
+
+    JSCompartment* oldCompartment = cx->compartment();
+    cx->enterCompartment(target->compartment());
+    return oldCompartment;
+}
+
+JS_PUBLIC_API(void)
+JS_LeaveCompartment(JSContext* cx, JSCompartment* oldCompartment)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    cx->leaveCompartment(oldCompartment);
+}
+
+JSAutoCompartment::JSAutoCompartment(JSContext* cx, JSObject* target
+                                     MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
+  : cx_(cx),
+    oldCompartment_(cx->compartment())
+{
+    AssertHeapIsIdleOrIterating(cx_);
+    MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+    MOZ_ASSERT(!JS::ObjectIsMarkedGray(target));
+    cx_->enterCompartment(target->compartment());
+}
+
+JSAutoCompartment::JSAutoCompartment(JSContext* cx, JSScript* target
+                                     MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
+  : cx_(cx),
+    oldCompartment_(cx->compartment())
+{
+    AssertHeapIsIdleOrIterating(cx_);
+    MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+    MOZ_ASSERT(!JS::ScriptIsMarkedGray(target));
+    cx_->enterCompartment(target->compartment());
+}
+
+JSAutoCompartment::~JSAutoCompartment()
+{
+    cx_->leaveCompartment(oldCompartment_);
+}
+
+JSAutoNullableCompartment::JSAutoNullableCompartment(JSContext* cx,
+                                                     JSObject* targetOrNull
+                                                     MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
+  : cx_(cx),
+    oldCompartment_(cx->compartment())
+{
+    AssertHeapIsIdleOrIterating(cx_);
+    MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+    if (targetOrNull) {
+        MOZ_ASSERT(!JS::ObjectIsMarkedGray(targetOrNull));
+        cx_->enterCompartment(targetOrNull->compartment());
+    } else {
+        cx_->enterNullCompartment();
+    }
+}
+
+JSAutoNullableCompartment::~JSAutoNullableCompartment()
+{
+    cx_->leaveCompartment(oldCompartment_);
+}
+
+JS_PUBLIC_API(void)
+JS_SetCompartmentPrivate(JSCompartment* compartment, void* data)
+{
+    compartment->data = data;
+}
+
+JS_PUBLIC_API(void*)
+JS_GetCompartmentPrivate(JSCompartment* compartment)
+{
+    return compartment->data;
+}
+
+JS_PUBLIC_API(JSAddonId*)
+JS::NewAddonId(JSContext* cx, HandleString str)
+{
+    return static_cast<JSAddonId*>(JS_AtomizeAndPinJSString(cx, str));
+}
+
+JS_PUBLIC_API(JSString*)
+JS::StringOfAddonId(JSAddonId* id)
+{
+    return id;
+}
+
+JS_PUBLIC_API(JSAddonId*)
+JS::AddonIdOfObject(JSObject* obj)
+{
+    return obj->compartment()->creationOptions().addonIdOrNull();
+}
+
+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);
+
+    // Don't allow a compacting GC to observe any intermediate state.
+    AutoDisableCompactingGC nocgc(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. Nuke 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();
+        if (!origobj->compartment()->putWrapper(cx, CrossCompartmentKey(newIdentity), origv))
+            MOZ_CRASH();
+    }
+
+    // The new identity object might be one of several things. Return it to avoid
+    // ambiguity.
+    return newIdentity;
+}
+
+/*
+ * Recompute all cross-compartment wrappers for an object, resetting state.
+ * Gecko uses this to clear Xray wrappers when doing a navigation that reuses
+ * the inner window and global object.
+ */
+JS_PUBLIC_API(bool)
+JS_RefreshCrossCompartmentWrappers(JSContext* cx, HandleObject obj)
+{
+    return RemapAllWrappersForObject(cx, obj, obj);
+}
+
+JS_PUBLIC_API(bool)
+JS_InitStandardClasses(JSContext* cx, HandleObject obj)
+{
+    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+
+    assertSameCompartment(cx, obj);
+
+    Rooted<GlobalObject*> global(cx, &obj->global());
+    return GlobalObject::initStandardClasses(cx, global);
+}
+
+#define EAGER_ATOM(name)            NAME_OFFSET(name)
+
+typedef struct JSStdName {
+    size_t      atomOffset;     /* offset of atom pointer in JSAtomState */
+    JSProtoKey  key;
+    bool isDummy() const { return key == JSProto_Null; }
+    bool isSentinel() const { return key == JSProto_LIMIT; }
+} JSStdName;
+
+static const JSStdName*
+LookupStdName(const JSAtomState& names, JSAtom* name, const JSStdName* table)
+{
+    for (unsigned i = 0; !table[i].isSentinel(); i++) {
+        if (table[i].isDummy())
+            continue;
+        JSAtom* atom = AtomStateOffsetToName(names, table[i].atomOffset);
+        MOZ_ASSERT(atom);
+        if (name == atom)
+            return &table[i];
+    }
+
+    return nullptr;
+}
+
+/*
+ * Table of standard classes, indexed by JSProtoKey. For entries where the
+ * JSProtoKey does not correspond to a class with a meaningful constructor, we
+ * insert a null entry into the table.
+ */
+#define STD_NAME_ENTRY(name, code, init, clasp) { EAGER_ATOM(name), static_cast<JSProtoKey>(code) },
+#define STD_DUMMY_ENTRY(name, code, init, dummy) { 0, JSProto_Null },
+static const JSStdName standard_class_names[] = {
+  JS_FOR_PROTOTYPES(STD_NAME_ENTRY, STD_DUMMY_ENTRY)
+  { 0, JSProto_LIMIT }
+};
+
+/*
+ * Table of top-level function and constant names and the JSProtoKey of the
+ * standard class that initializes them.
+ */
+static const JSStdName builtin_property_names[] = {
+    { EAGER_ATOM(eval), JSProto_Object },
+
+    /* Global properties and functions defined by the Number class. */
+    { EAGER_ATOM(NaN), JSProto_Number },
+    { EAGER_ATOM(Infinity), JSProto_Number },
+    { EAGER_ATOM(isNaN), JSProto_Number },
+    { EAGER_ATOM(isFinite), JSProto_Number },
+    { EAGER_ATOM(parseFloat), JSProto_Number },
+    { EAGER_ATOM(parseInt), JSProto_Number },
+
+    /* String global functions. */
+    { EAGER_ATOM(escape), JSProto_String },
+    { EAGER_ATOM(unescape), JSProto_String },
+    { EAGER_ATOM(decodeURI), JSProto_String },
+    { EAGER_ATOM(encodeURI), JSProto_String },
+    { EAGER_ATOM(decodeURIComponent), JSProto_String },
+    { EAGER_ATOM(encodeURIComponent), JSProto_String },
+#if JS_HAS_UNEVAL
+    { EAGER_ATOM(uneval), JSProto_String },
+#endif
+
+    { 0, JSProto_LIMIT }
+};
+
+#undef EAGER_ATOM
+
+JS_PUBLIC_API(bool)
+JS_ResolveStandardClass(JSContext* cx, HandleObject obj, HandleId id, bool* resolved)
+{
+    const JSStdName* stdnm;
+
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, id);
+
+    Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
+    *resolved = false;
+
+    if (!JSID_IS_ATOM(id))
+        return true;
+
+    /* Check whether we're resolving 'undefined', and define it if so. */
+    JSAtom* idAtom = JSID_TO_ATOM(id);
+    JSAtom* undefinedAtom = cx->names().undefined;
+    if (idAtom == undefinedAtom) {
+        *resolved = true;
+        return DefineProperty(cx, global, id, UndefinedHandleValue, nullptr, nullptr,
+                              JSPROP_PERMANENT | JSPROP_READONLY | JSPROP_RESOLVING);
+    }
+
+    /* Try for class constructors/prototypes named by well-known atoms. */
+    stdnm = LookupStdName(cx->names(), idAtom, standard_class_names);
+
+    /* Try less frequently used top-level functions and constants. */
+    if (!stdnm)
+        stdnm = LookupStdName(cx->names(), idAtom, builtin_property_names);
+
+    if (stdnm && GlobalObject::skipDeselectedConstructor(cx, stdnm->key))
+        stdnm = nullptr;
+
+    // If this class is anonymous, then it doesn't exist as a global
+    // property, so we won't resolve anything.
+    JSProtoKey key = stdnm ? stdnm->key : JSProto_Null;
+    if (key != JSProto_Null) {
+        const Class* clasp = ProtoKeyToClass(key);
+        if (!clasp || !(clasp->flags & JSCLASS_IS_ANONYMOUS)) {
+            if (!GlobalObject::ensureConstructor(cx, global, key))
+                return false;
+
+            *resolved = true;
+            return true;
+        }
+    }
+
+    // There is no such property to resolve. An ordinary resolve hook would
+    // just return true at this point. But the global object is special in one
+    // more way: its prototype chain is lazily initialized. That is,
+    // global->getProto() might be null right now because we haven't created
+    // Object.prototype yet. Force it now.
+    if (!global->getOrCreateObjectPrototype(cx))
+        return false;
+
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS_MayResolveStandardClass(const JSAtomState& names, jsid id, JSObject* maybeObj)
+{
+    MOZ_ASSERT_IF(maybeObj, maybeObj->is<GlobalObject>());
+
+    // The global object's resolve hook is special: JS_ResolveStandardClass
+    // initializes the prototype chain lazily. Only attempt to optimize here
+    // if we know the prototype chain has been initialized.
+    if (!maybeObj || !maybeObj->staticPrototype())
+        return true;
+
+    if (!JSID_IS_ATOM(id))
+        return false;
+
+    JSAtom* atom = JSID_TO_ATOM(id);
+
+    // This will return true even for deselected constructors.  (To do
+    // better, we need a JSContext here; it's fine as it is.)
+
+    return atom == names.undefined ||
+           LookupStdName(names, atom, standard_class_names) ||
+           LookupStdName(names, atom, builtin_property_names);
+}
+
+JS_PUBLIC_API(bool)
+JS_EnumerateStandardClasses(JSContext* cx, HandleObject obj)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj);
+    MOZ_ASSERT(obj->is<GlobalObject>());
+    Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
+    return GlobalObject::initStandardClasses(cx, global);
+}
+
+JS_PUBLIC_API(bool)
+JS_GetClassObject(JSContext* cx, JSProtoKey key, MutableHandleObject objp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return GetBuiltinConstructor(cx, key, objp);
+}
+
+JS_PUBLIC_API(bool)
+JS_GetClassPrototype(JSContext* cx, JSProtoKey key, MutableHandleObject objp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return GetBuiltinPrototype(cx, key, objp);
+}
+
+namespace JS {
+
+JS_PUBLIC_API(void)
+ProtoKeyToId(JSContext* cx, JSProtoKey key, MutableHandleId idp)
+{
+    idp.set(NameToId(ClassName(key, cx)));
+}
+
+} /* namespace JS */
+
+JS_PUBLIC_API(JSProtoKey)
+JS_IdToProtoKey(JSContext* cx, HandleId id)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+
+    if (!JSID_IS_ATOM(id))
+        return JSProto_Null;
+
+    JSAtom* atom = JSID_TO_ATOM(id);
+    const JSStdName* stdnm = LookupStdName(cx->names(), atom, standard_class_names);
+    if (!stdnm)
+        return JSProto_Null;
+
+    if (GlobalObject::skipDeselectedConstructor(cx, stdnm->key))
+        return JSProto_Null;
+
+    MOZ_ASSERT(MOZ_ARRAY_LENGTH(standard_class_names) == JSProto_LIMIT + 1);
+    return static_cast<JSProtoKey>(stdnm - standard_class_names);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetObjectPrototype(JSContext* cx, HandleObject forObj)
+{
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, forObj);
+    return forObj->global().getOrCreateObjectPrototype(cx);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetFunctionPrototype(JSContext* cx, HandleObject forObj)
+{
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, forObj);
+    return forObj->global().getOrCreateFunctionPrototype(cx);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetArrayPrototype(JSContext* cx, HandleObject forObj)
+{
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, forObj);
+    Rooted<GlobalObject*> global(cx, &forObj->global());
+    return GlobalObject::getOrCreateArrayPrototype(cx, global);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetErrorPrototype(JSContext* cx)
+{
+    CHECK_REQUEST(cx);
+    Rooted<GlobalObject*> global(cx, cx->global());
+    return GlobalObject::getOrCreateCustomErrorPrototype(cx, global, JSEXN_ERR);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetIteratorPrototype(JSContext* cx)
+{
+    CHECK_REQUEST(cx);
+    Rooted<GlobalObject*> global(cx, cx->global());
+    return GlobalObject::getOrCreateIteratorPrototype(cx, global);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetGlobalForObject(JSContext* cx, JSObject* obj)
+{
+    AssertHeapIsIdle(cx);
+    assertSameCompartment(cx, obj);
+    return &obj->global();
+}
+
+extern JS_PUBLIC_API(bool)
+JS_IsGlobalObject(JSObject* obj)
+{
+    return obj->is<GlobalObject>();
+}
+
+extern JS_PUBLIC_API(JSObject*)
+JS_GlobalLexicalEnvironment(JSObject* obj)
+{
+    return &obj->as<GlobalObject>().lexicalEnvironment();
+}
+
+extern JS_PUBLIC_API(bool)
+JS_HasExtensibleLexicalEnvironment(JSObject* obj)
+{
+    return obj->is<GlobalObject>() || obj->compartment()->getNonSyntacticLexicalEnvironment(obj);
+}
+
+extern JS_PUBLIC_API(JSObject*)
+JS_ExtensibleLexicalEnvironment(JSObject* obj)
+{
+    JSObject* lexical = nullptr;
+    if (obj->is<GlobalObject>())
+        lexical = JS_GlobalLexicalEnvironment(obj);
+    else
+        lexical = obj->compartment()->getNonSyntacticLexicalEnvironment(obj);
+    MOZ_ASSERT(lexical);
+    return lexical;
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetGlobalForCompartmentOrNull(JSContext* cx, JSCompartment* c)
+{
+    AssertHeapIsIdleOrIterating(cx);
+    assertSameCompartment(cx, c);
+    return c->maybeGlobal();
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::CurrentGlobalOrNull(JSContext* cx)
+{
+    AssertHeapIsIdleOrIterating(cx);
+    CHECK_REQUEST(cx);
+    if (!cx->compartment())
+        return nullptr;
+    return cx->global();
+}
+
+JS_PUBLIC_API(Value)
+JS::detail::ComputeThis(JSContext* cx, Value* vp)
+{
+    AssertHeapIsIdle(cx);
+    assertSameCompartment(cx, JSValueArray(vp, 2));
+
+    MutableHandleValue thisv = MutableHandleValue::fromMarkedLocation(&vp[1]);
+    if (!BoxNonStrictThis(cx, thisv, thisv))
+        return NullValue();
+
+    return 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(void)
+JS_updateMallocCounter(JSContext* cx, size_t nbytes)
+{
+    return cx->updateMallocCounter(nbytes);
+}
+
+JS_PUBLIC_API(char*)
+JS_strdup(JSContext* cx, const char* s)
+{
+    AssertHeapIsIdle(cx);
+    return DuplicateString(cx, s).release();
+}
+
+#undef JS_AddRoot
+
+JS_PUBLIC_API(bool)
+JS_AddExtraGCRootsTracer(JSContext* cx, JSTraceDataOp traceOp, void* data)
+{
+    return cx->gc.addBlackRootsTracer(traceOp, data);
+}
+
+JS_PUBLIC_API(void)
+JS_RemoveExtraGCRootsTracer(JSContext* cx, JSTraceDataOp traceOp, void* data)
+{
+    return cx->gc.removeBlackRootsTracer(traceOp, data);
+}
+
+JS_PUBLIC_API(void)
+JS_GC(JSContext* cx)
+{
+    AssertHeapIsIdle(cx);
+    JS::PrepareForFullGC(cx);
+    cx->gc.gc(GC_NORMAL, JS::gcreason::API);
+}
+
+JS_PUBLIC_API(void)
+JS_MaybeGC(JSContext* cx)
+{
+    GCRuntime& gc = cx->runtime()->gc;
+    gc.maybeGC(cx->zone());
+}
+
+JS_PUBLIC_API(void)
+JS_SetGCCallback(JSContext* cx, JSGCCallback cb, void* data)
+{
+    AssertHeapIsIdle(cx);
+    cx->gc.setGCCallback(cb, data);
+}
+
+JS_PUBLIC_API(void)
+JS_SetObjectsTenuredCallback(JSContext* cx, JSObjectsTenuredCallback cb,
+                             void* data)
+{
+    AssertHeapIsIdle(cx);
+    cx->gc.setObjectsTenuredCallback(cb, data);
+}
+
+JS_PUBLIC_API(bool)
+JS_AddFinalizeCallback(JSContext* cx, JSFinalizeCallback cb, void* data)
+{
+    AssertHeapIsIdle(cx);
+    return cx->gc.addFinalizeCallback(cb, data);
+}
+
+JS_PUBLIC_API(void)
+JS_RemoveFinalizeCallback(JSContext* cx, JSFinalizeCallback cb)
+{
+    cx->gc.removeFinalizeCallback(cb);
+}
+
+JS_PUBLIC_API(bool)
+JS_AddWeakPointerZoneGroupCallback(JSContext* cx, JSWeakPointerZoneGroupCallback cb, void* data)
+{
+    AssertHeapIsIdle(cx);
+    return cx->gc.addWeakPointerZoneGroupCallback(cb, data);
+}
+
+JS_PUBLIC_API(void)
+JS_RemoveWeakPointerZoneGroupCallback(JSContext* cx, JSWeakPointerZoneGroupCallback cb)
+{
+    cx->gc.removeWeakPointerZoneGroupCallback(cb);
+}
+
+JS_PUBLIC_API(bool)
+JS_AddWeakPointerCompartmentCallback(JSContext* cx, JSWeakPointerCompartmentCallback cb,
+                                     void* data)
+{
+    AssertHeapIsIdle(cx);
+    return cx->gc.addWeakPointerCompartmentCallback(cb, data);
+}
+
+JS_PUBLIC_API(void)
+JS_RemoveWeakPointerCompartmentCallback(JSContext* cx, JSWeakPointerCompartmentCallback cb)
+{
+    cx->gc.removeWeakPointerCompartmentCallback(cb);
+}
+
+
+JS_PUBLIC_API(void)
+JS_UpdateWeakPointerAfterGC(JS::Heap<JSObject*>* objp)
+{
+    JS_UpdateWeakPointerAfterGCUnbarriered(objp->unsafeGet());
+}
+
+JS_PUBLIC_API(void)
+JS_UpdateWeakPointerAfterGCUnbarriered(JSObject** objp)
+{
+    if (IsAboutToBeFinalizedUnbarriered(objp))
+        *objp = nullptr;
+}
+
+JS_PUBLIC_API(void)
+JS_SetGCParameter(JSContext* cx, JSGCParamKey key, uint32_t value)
+{
+    cx->gc.waitBackgroundSweepEnd();
+    AutoLockGC lock(cx);
+    MOZ_ALWAYS_TRUE(cx->gc.setParameter(key, value, lock));
+}
+
+JS_PUBLIC_API(uint32_t)
+JS_GetGCParameter(JSContext* cx, JSGCParamKey key)
+{
+    AutoLockGC lock(cx);
+    return cx->gc.getParameter(key, lock);
+}
+
+static const size_t NumGCConfigs = 14;
+struct JSGCConfig {
+    JSGCParamKey key;
+    uint32_t value;
+};
+
+JS_PUBLIC_API(void)
+JS_SetGCParametersBasedOnAvailableMemory(JSContext* cx, 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_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_MODE, JSGC_MODE_ZONE}
+        };
+
+        config = nominal;
+    }
+
+    for (size_t i = 0; i < NumGCConfigs; i++)
+        JS_SetGCParameter(cx, 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(JSContext* cx, StackKind kind, size_t stackSize)
+{
+    cx->nativeStackQuota[kind] = stackSize;
+
+#if JS_STACK_GROWTH_DIRECTION > 0
+    if (stackSize == 0) {
+        cx->nativeStackLimit[kind] = UINTPTR_MAX;
+    } else {
+        MOZ_ASSERT(cx->nativeStackBase <= size_t(-1) - stackSize);
+        cx->nativeStackLimit[kind] = cx->nativeStackBase + stackSize - 1;
+    }
+#else
+    if (stackSize == 0) {
+        cx->nativeStackLimit[kind] = 0;
+    } else {
+        MOZ_ASSERT(cx->nativeStackBase >= stackSize);
+        cx->nativeStackLimit[kind] = cx->nativeStackBase - (stackSize - 1);
+    }
+#endif
+}
+
+JS_PUBLIC_API(void)
+JS_SetNativeStackQuota(JSContext* cx, size_t systemCodeStackSize, size_t trustedScriptStackSize,
+                       size_t untrustedScriptStackSize)
+{
+    MOZ_ASSERT(cx->requestDepth == 0);
+
+    if (!trustedScriptStackSize)
+        trustedScriptStackSize = systemCodeStackSize;
+    else
+        MOZ_ASSERT(trustedScriptStackSize < systemCodeStackSize);
+
+    if (!untrustedScriptStackSize)
+        untrustedScriptStackSize = trustedScriptStackSize;
+    else
+        MOZ_ASSERT(untrustedScriptStackSize < trustedScriptStackSize);
+
+    SetNativeStackQuotaAndLimit(cx, StackForSystemCode, systemCodeStackSize);
+    SetNativeStackQuotaAndLimit(cx, StackForTrustedScript, trustedScriptStackSize);
+    SetNativeStackQuotaAndLimit(cx, StackForUntrustedScript, untrustedScriptStackSize);
+
+    cx->initJitStackLimit();
+}
+
+/************************************************************************/
+
+JS_PUBLIC_API(bool)
+JS_ValueToId(JSContext* cx, HandleValue value, MutableHandleId idp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, value);
+    return ValueToId<CanGC>(cx, value, idp);
+}
+
+JS_PUBLIC_API(bool)
+JS_StringToId(JSContext* cx, HandleString string, MutableHandleId idp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, string);
+    RootedValue value(cx, StringValue(string));
+    return ValueToId<CanGC>(cx, value, idp);
+}
+
+JS_PUBLIC_API(bool)
+JS_IdToValue(JSContext* cx, jsid id, MutableHandleValue vp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    vp.set(IdToValue(id));
+    assertSameCompartment(cx, vp);
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS::ToPrimitive(JSContext* cx, HandleObject obj, JSType hint, MutableHandleValue vp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    MOZ_ASSERT(obj != nullptr);
+    MOZ_ASSERT(hint == JSTYPE_VOID || hint == JSTYPE_STRING || hint == JSTYPE_NUMBER);
+    vp.setObject(*obj);
+    return ToPrimitiveSlow(cx, hint, vp);
+}
+
+JS_PUBLIC_API(bool)
+JS::GetFirstArgumentAsTypeHint(JSContext* cx, CallArgs args, JSType *result)
+{
+    if (!args.get(0).isString()) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
+                                  "Symbol.toPrimitive",
+                                  "\"string\", \"number\", or \"default\"",
+                                  InformalValueTypeName(args.get(0)));
+        return false;
+    }
+
+    RootedString str(cx, args.get(0).toString());
+    bool match;
+
+    if (!EqualStrings(cx, str, cx->names().default_, &match))
+        return false;
+    if (match) {
+        *result = JSTYPE_VOID;
+        return true;
+    }
+
+    if (!EqualStrings(cx, str, cx->names().string, &match))
+        return false;
+    if (match) {
+        *result = JSTYPE_STRING;
+        return true;
+    }
+
+    if (!EqualStrings(cx, str, cx->names().number, &match))
+        return false;
+    if (match) {
+        *result = JSTYPE_NUMBER;
+        return true;
+    }
+
+    JSAutoByteString bytes;
+    const char* source = ValueToSourceForError(cx, args.get(0), bytes);
+    if (!source) {
+        ReportOutOfMemory(cx);
+        return false;
+    }
+
+    JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr, JSMSG_NOT_EXPECTED_TYPE,
+                               "Symbol.toPrimitive",
+                               "\"string\", \"number\", or \"default\"", source);
+    return false;
+}
+
+JS_PUBLIC_API(bool)
+JS_PropertyStub(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp)
+{
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS_StrictPropertyStub(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp,
+                      ObjectOpResult& result)
+{
+    return result.succeed();
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_InitClass(JSContext* cx, HandleObject obj, HandleObject parent_proto,
+             const JSClass* clasp, JSNative constructor, unsigned nargs,
+             const JSPropertySpec* ps, const JSFunctionSpec* fs,
+             const JSPropertySpec* static_ps, const JSFunctionSpec* static_fs)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, parent_proto);
+    return InitClass(cx, obj, parent_proto, Valueify(clasp), constructor,
+                     nargs, ps, fs, static_ps, static_fs);
+}
+
+JS_PUBLIC_API(bool)
+JS_LinkConstructorAndPrototype(JSContext* cx, HandleObject ctor, HandleObject proto)
+{
+    return LinkConstructorAndPrototype(cx, ctor, proto);
+}
+
+JS_PUBLIC_API(const JSClass*)
+JS_GetClass(JSObject* obj)
+{
+    return obj->getJSClass();
+}
+
+JS_PUBLIC_API(bool)
+JS_InstanceOf(JSContext* cx, HandleObject obj, const JSClass* clasp, CallArgs* args)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+#ifdef DEBUG
+    if (args) {
+        assertSameCompartment(cx, obj);
+        assertSameCompartment(cx, args->thisv(), args->calleev());
+    }
+#endif
+    if (!obj || obj->getJSClass() != clasp) {
+        if (args)
+            ReportIncompatibleMethod(cx, *args, Valueify(clasp));
+        return false;
+    }
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS_HasInstance(JSContext* cx, HandleObject obj, HandleValue value, bool* bp)
+{
+    AssertHeapIsIdle(cx);
+    assertSameCompartment(cx, obj, value);
+    return HasInstance(cx, obj, value, bp);
+}
+
+JS_PUBLIC_API(void*)
+JS_GetPrivate(JSObject* obj)
+{
+    /* This function can be called by a finalizer. */
+    return obj->as<NativeObject>().getPrivate();
+}
+
+JS_PUBLIC_API(void)
+JS_SetPrivate(JSObject* obj, void* data)
+{
+    /* This function can be called by a finalizer. */
+    obj->as<NativeObject>().setPrivate(data);
+}
+
+JS_PUBLIC_API(void*)
+JS_GetInstancePrivate(JSContext* cx, HandleObject obj, const JSClass* clasp, CallArgs* args)
+{
+    if (!JS_InstanceOf(cx, obj, clasp, args))
+        return nullptr;
+    return obj->as<NativeObject>().getPrivate();
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetConstructor(JSContext* cx, HandleObject proto)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, proto);
+
+    RootedValue cval(cx);
+    if (!GetProperty(cx, proto, proto, cx->names().constructor, &cval))
+        return nullptr;
+    if (!IsFunctionObject(cval)) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_NO_CONSTRUCTOR,
+                                  proto->getClass()->name);
+        return nullptr;
+    }
+    return &cval.toObject();
+}
+
+bool
+JS::CompartmentBehaviors::extraWarnings(JSContext* cx) const
+{
+    return extraWarningsOverride_.get(cx->options().extraWarnings());
+}
+
+JS::CompartmentCreationOptions&
+JS::CompartmentCreationOptions::setZone(ZoneSpecifier spec)
+{
+    zone_.spec = spec;
+    return *this;
+}
+
+JS::CompartmentCreationOptions&
+JS::CompartmentCreationOptions::setSameZoneAs(JSObject* obj)
+{
+    zone_.pointer = static_cast<void*>(obj->zone());
+    return *this;
+}
+
+const JS::CompartmentCreationOptions&
+JS::CompartmentCreationOptionsRef(JSCompartment* compartment)
+{
+    return compartment->creationOptions();
+}
+
+const JS::CompartmentCreationOptions&
+JS::CompartmentCreationOptionsRef(JSObject* obj)
+{
+    return obj->compartment()->creationOptions();
+}
+
+const JS::CompartmentCreationOptions&
+JS::CompartmentCreationOptionsRef(JSContext* cx)
+{
+    return cx->compartment()->creationOptions();
+}
+
+bool
+JS::CompartmentCreationOptions::getSharedMemoryAndAtomicsEnabled() const
+{
+#if defined(ENABLE_SHARED_ARRAY_BUFFER)
+    return sharedMemoryAndAtomics_;
+#else
+    return false;
+#endif
+}
+
+JS::CompartmentCreationOptions&
+JS::CompartmentCreationOptions::setSharedMemoryAndAtomicsEnabled(bool flag)
+{
+#if defined(ENABLE_SHARED_ARRAY_BUFFER)
+    sharedMemoryAndAtomics_ = flag;
+#endif
+    return *this;
+}
+
+JS::CompartmentBehaviors&
+JS::CompartmentBehaviorsRef(JSCompartment* compartment)
+{
+    return compartment->behaviors();
+}
+
+JS::CompartmentBehaviors&
+JS::CompartmentBehaviorsRef(JSObject* obj)
+{
+    return obj->compartment()->behaviors();
+}
+
+JS::CompartmentBehaviors&
+JS::CompartmentBehaviorsRef(JSContext* cx)
+{
+    return cx->compartment()->behaviors();
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_NewGlobalObject(JSContext* cx, const JSClass* clasp, JSPrincipals* principals,
+                   JS::OnNewGlobalHookOption hookOption,
+                   const JS::CompartmentOptions& options)
+{
+    MOZ_RELEASE_ASSERT(cx->runtime()->hasInitializedSelfHosting(),
+                       "Must call JS::InitSelfHostedCode() before creating a global");
+
+    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.
+    //
+    // Similarly, if we GC when creating the global, we may not have set that
+    // global's compartment's global pointer yet. In this case, the compartment
+    // will not yet contain anything that needs to be traced.
+    if (!global->isOwnGlobal(trc))
+        return;
+
+    // Trace the compartment for any GC things that should only stick around if
+    // we know the compartment is live.
+    global->compartment()->trace(trc);
+
+    if (JSTraceOp trace = global->compartment()->creationOptions().getTrace())
+        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(void)
+JS::AssertObjectBelongsToCurrentThread(JSObject* obj)
+{
+    JSRuntime* rt = obj->compartment()->runtimeFromAnyThread();
+    MOZ_RELEASE_ASSERT(CurrentThreadCanAccessRuntime(rt));
+}
+
+
+/*** Standard internal methods *******************************************************************/
+
+JS_PUBLIC_API(bool)
+JS_GetPrototype(JSContext* cx, HandleObject obj, MutableHandleObject result)
+{
+    return GetPrototype(cx, obj, result);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetPrototype(JSContext* cx, HandleObject obj, HandleObject proto)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, proto);
+
+    return SetPrototype(cx, obj, proto);
+}
+
+JS_PUBLIC_API(bool)
+JS_GetPrototypeIfOrdinary(JSContext* cx, HandleObject obj, bool* isOrdinary,
+                          MutableHandleObject result)
+{
+    return GetPrototypeIfOrdinary(cx, obj, isOrdinary, result);
+}
+
+JS_PUBLIC_API(bool)
+JS_IsExtensible(JSContext* cx, HandleObject obj, bool* extensible)
+{
+    return IsExtensible(cx, obj, extensible);
+}
+
+JS_PUBLIC_API(bool)
+JS_PreventExtensions(JSContext* cx, JS::HandleObject obj, ObjectOpResult& result)
+{
+    return PreventExtensions(cx, obj, result);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetImmutablePrototype(JSContext *cx, JS::HandleObject obj, bool *succeeded)
+{
+    return SetImmutablePrototype(cx, obj, succeeded);
+}
+
+JS_PUBLIC_API(bool)
+JS_GetOwnPropertyDescriptorById(JSContext* cx, HandleObject obj, HandleId id,
+                                MutableHandle<PropertyDescriptor> 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<PropertyDescriptor> 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<PropertyDescriptor> 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<PropertyDescriptor> desc)
+{
+    return GetPropertyDescriptor(cx, obj, id, desc);
+}
+
+JS_PUBLIC_API(bool)
+JS_GetPropertyDescriptor(JSContext* cx, HandleObject obj, const char* name,
+                         MutableHandle<PropertyDescriptor> desc)
+{
+    JSAtom* atom = Atomize(cx, name, strlen(name));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return atom && JS_GetPropertyDescriptorById(cx, obj, id, desc);
+}
+
+static bool
+DefinePropertyByDescriptor(JSContext* cx, HandleObject obj, HandleId id,
+                           Handle<PropertyDescriptor> 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<PropertyDescriptor> desc, ObjectOpResult& result)
+{
+    return DefinePropertyByDescriptor(cx, obj, id, desc, result);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id,
+                      Handle<PropertyDescriptor> desc)
+{
+    ObjectOpResult result;
+    return DefinePropertyByDescriptor(cx, obj, id, desc, result) &&
+           result.checkStrict(cx, obj, id);
+}
+
+static bool
+DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleValue value,
+                   const JSNativeWrapper& get, const JSNativeWrapper& set,
+                   unsigned attrs, unsigned flags)
+{
+    JSGetterOp getter = JS_CAST_NATIVE_TO(get.op, JSGetterOp);
+    JSSetterOp setter = JS_CAST_NATIVE_TO(set.op, JSSetterOp);
+
+    // JSPROP_READONLY has no meaning when accessors are involved. Ideally we'd
+    // throw if this happens, but we've accepted it for long enough that it's
+    // not worth trying to make callers change their ways. Just flip it off on
+    // its way through the API layer so that we can enforce this internally.
+    if (attrs & (JSPROP_GETTER | JSPROP_SETTER))
+        attrs &= ~JSPROP_READONLY;
+
+    // When we use DefineProperty, we need full scriptable Function objects rather
+    // than JSNatives. However, we might be pulling this property descriptor off
+    // of something with JSNative property descriptors. If we are, wrap them in
+    // JS Function objects.
+    //
+    // But skip doing this if our accessors are the well-known stub
+    // accessors, since those are known to be JSGetterOps.  Assert
+    // some sanity about it, though.
+    MOZ_ASSERT_IF(getter == JS_PropertyStub,
+                  setter == JS_StrictPropertyStub || (attrs & JSPROP_PROPOP_ACCESSORS));
+    MOZ_ASSERT_IF(setter == JS_StrictPropertyStub,
+                  getter == JS_PropertyStub || (attrs & JSPROP_PROPOP_ACCESSORS));
+
+    // If !(attrs & JSPROP_PROPOP_ACCESSORS), then either getter/setter are both
+    // possibly-null JSNatives (or possibly-null JSFunction* if JSPROP_GETTER or
+    // JSPROP_SETTER is appropriately set), or both are the well-known property
+    // stubs.  The subsequent block must handle only the first of these cases,
+    // so carefully exclude the latter case.
+    if (!(attrs & JSPROP_PROPOP_ACCESSORS) &&
+        getter != JS_PropertyStub && setter != JS_StrictPropertyStub)
+    {
+        if (getter && !(attrs & JSPROP_GETTER)) {
+            RootedAtom atom(cx, IdToFunctionName(cx, id, "get"));
+            if (!atom)
+                return false;
+            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);
+            RootedAtom atom(cx, IdToFunctionName(cx, id, "set"));
+            if (!atom)
+                return false;
+            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()->getGetProperty();
+        if (!setter)
+            setter = obj->getClass()->getSetProperty();
+    }
+    if (getter == JS_PropertyStub)
+        getter = nullptr;
+    if (setter == JS_StrictPropertyStub)
+        setter = nullptr;
+    return DefineProperty(cx, obj, id, value, getter, setter, attrs);
+}
+
+/*
+ * Wrapper functions to create wrappers with no corresponding JSJitInfo from API
+ * function arguments.
+ */
+static JSNativeWrapper
+NativeOpWrapper(Native native)
+{
+    JSNativeWrapper ret;
+    ret.op = native;
+    ret.info = nullptr;
+    return ret;
+}
+
+JS_PUBLIC_API(bool)
+JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleValue value,
+                      unsigned attrs, Native getter, Native setter)
+{
+    return DefinePropertyById(cx, obj, id, value,
+                              NativeOpWrapper(getter), NativeOpWrapper(setter),
+                              attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleObject valueArg,
+                      unsigned attrs, Native getter, Native setter)
+{
+    RootedValue value(cx, ObjectValue(*valueArg));
+    return DefinePropertyById(cx, obj, id, value,
+                              NativeOpWrapper(getter), NativeOpWrapper(setter),
+                              attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleString valueArg,
+                      unsigned attrs, Native getter, Native setter)
+{
+    RootedValue value(cx, StringValue(valueArg));
+    return DefinePropertyById(cx, obj, id, value,
+                              NativeOpWrapper(getter), NativeOpWrapper(setter),
+                              attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, int32_t valueArg,
+                      unsigned attrs, Native getter, Native setter)
+{
+    Value value = Int32Value(valueArg);
+    return DefinePropertyById(cx, obj, id, HandleValue::fromMarkedLocation(&value),
+                              NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, uint32_t valueArg,
+                      unsigned attrs, Native getter, Native setter)
+{
+    Value value = NumberValue(valueArg);
+    return DefinePropertyById(cx, obj, id, HandleValue::fromMarkedLocation(&value),
+                              NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefinePropertyById(JSContext* cx, HandleObject obj, HandleId id, double valueArg,
+                      unsigned attrs, Native getter, Native setter)
+{
+    Value value = NumberValue(valueArg);
+    return DefinePropertyById(cx, obj, id, HandleValue::fromMarkedLocation(&value),
+                              NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
+}
+
+static bool
+DefineProperty(JSContext* cx, HandleObject obj, const char* name, HandleValue value,
+               const JSNativeWrapper& getter, const JSNativeWrapper& setter,
+               unsigned attrs, unsigned flags)
+{
+    AutoRooterGetterSetter gsRoot(cx, attrs, const_cast<JSNative*>(&getter.op),
+                                  const_cast<JSNative*>(&setter.op));
+
+    JSAtom* atom = Atomize(cx, name, strlen(name));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+
+    return DefinePropertyById(cx, obj, id, value, getter, setter, attrs, flags);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, HandleValue value,
+                  unsigned attrs,
+                  Native getter /* = nullptr */, Native setter /* = nullptr */)
+{
+    return DefineProperty(cx, obj, name, value, NativeOpWrapper(getter), NativeOpWrapper(setter),
+                          attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, HandleObject valueArg,
+                  unsigned attrs,
+                  Native getter /* = nullptr */, Native setter /* = nullptr */)
+{
+    RootedValue value(cx, ObjectValue(*valueArg));
+    return DefineProperty(cx, obj, name, value, NativeOpWrapper(getter), NativeOpWrapper(setter),
+                          attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, HandleString valueArg,
+                  unsigned attrs,
+                  Native getter /* = nullptr */, Native setter /* = nullptr */)
+{
+    RootedValue value(cx, StringValue(valueArg));
+    return DefineProperty(cx, obj, name, value, NativeOpWrapper(getter), NativeOpWrapper(setter),
+                          attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, int32_t valueArg,
+                  unsigned attrs,
+                  Native getter /* = nullptr */, Native setter /* = nullptr */)
+{
+    Value value = Int32Value(valueArg);
+    return DefineProperty(cx, obj, name, HandleValue::fromMarkedLocation(&value),
+                          NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, uint32_t valueArg,
+                  unsigned attrs,
+                  Native getter /* = nullptr */, Native setter /* = nullptr */)
+{
+    Value value = NumberValue(valueArg);
+    return DefineProperty(cx, obj, name, HandleValue::fromMarkedLocation(&value),
+                          NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineProperty(JSContext* cx, HandleObject obj, const char* name, double valueArg,
+                  unsigned attrs,
+                  Native getter /* = nullptr */, Native setter /* = nullptr */)
+{
+    Value value = NumberValue(valueArg);
+    return DefineProperty(cx, obj, name, HandleValue::fromMarkedLocation(&value),
+                          NativeOpWrapper(getter), NativeOpWrapper(setter), attrs, 0);
+}
+
+#define AUTO_NAMELEN(s,n)   (((n) == (size_t)-1) ? js_strlen(s) : (n))
+
+JS_PUBLIC_API(bool)
+JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                    Handle<PropertyDescriptor> 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<PropertyDescriptor> desc)
+{
+    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    ObjectOpResult result;
+    return DefinePropertyByDescriptor(cx, obj, id, desc, result) &&
+           result.checkStrict(cx, obj, id);
+}
+
+static bool
+DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                 const Value& value_, Native getter, Native setter, unsigned attrs,
+                 unsigned flags)
+{
+    RootedValue value(cx, value_);
+    AutoRooterGetterSetter gsRoot(cx, attrs, &getter, &setter);
+    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return DefinePropertyById(cx, obj, id, value, NativeOpWrapper(getter), NativeOpWrapper(setter),
+                              attrs, flags);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                    HandleValue value, unsigned attrs, Native getter, Native setter)
+{
+    return DefineUCProperty(cx, obj, name, namelen, value, getter, setter, attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                    HandleObject valueArg, unsigned attrs, Native getter, Native setter)
+{
+    RootedValue value(cx, ObjectValue(*valueArg));
+    return DefineUCProperty(cx, obj, name, namelen, value, getter, setter, attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                    HandleString valueArg, unsigned attrs, Native getter, Native setter)
+{
+    RootedValue value(cx, StringValue(valueArg));
+    return DefineUCProperty(cx, obj, name, namelen, value, getter, setter, attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                    int32_t valueArg, unsigned attrs, Native getter, Native setter)
+{
+    Value value = Int32Value(valueArg);
+    return DefineUCProperty(cx, obj, name, namelen, HandleValue::fromMarkedLocation(&value),
+                            getter, setter, attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                    uint32_t valueArg, unsigned attrs, Native getter, Native setter)
+{
+    Value value = NumberValue(valueArg);
+    return DefineUCProperty(cx, obj, name, namelen, HandleValue::fromMarkedLocation(&value),
+                            getter, setter, attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                    double valueArg, unsigned attrs, Native getter, Native setter)
+{
+    Value value = NumberValue(valueArg);
+    return DefineUCProperty(cx, obj, name, namelen, HandleValue::fromMarkedLocation(&value),
+                            getter, setter, attrs, 0);
+}
+
+static bool
+DefineElement(JSContext* cx, HandleObject obj, uint32_t index, HandleValue value,
+              unsigned attrs, Native getter, Native setter)
+{
+    AutoRooterGetterSetter gsRoot(cx, attrs, &getter, &setter);
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    RootedId id(cx);
+    if (!IndexToId(cx, index, &id))
+        return false;
+    return DefinePropertyById(cx, obj, id, value,
+                              NativeOpWrapper(getter), NativeOpWrapper(setter),
+                              attrs, 0);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, HandleValue value,
+                 unsigned attrs, Native getter, Native setter)
+{
+    return DefineElement(cx, obj, index, value, attrs, getter, setter);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, HandleObject valueArg,
+                 unsigned attrs, Native getter, Native setter)
+{
+    RootedValue value(cx, ObjectValue(*valueArg));
+    return DefineElement(cx, obj, index, value, attrs, getter, setter);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, HandleString valueArg,
+                 unsigned attrs, Native getter, Native setter)
+{
+    RootedValue value(cx, StringValue(valueArg));
+    return DefineElement(cx, obj, index, value, attrs, getter, setter);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, int32_t valueArg,
+                 unsigned attrs, Native getter, Native setter)
+{
+    Value value = Int32Value(valueArg);
+    return DefineElement(cx, obj, index, HandleValue::fromMarkedLocation(&value),
+                         attrs, getter, setter);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, uint32_t valueArg,
+                 unsigned attrs, Native getter, Native setter)
+{
+    Value value = NumberValue(valueArg);
+    return DefineElement(cx, obj, index, HandleValue::fromMarkedLocation(&value),
+                         attrs, getter, setter);
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineElement(JSContext* cx, HandleObject obj, uint32_t index, double valueArg,
+                 unsigned attrs, Native getter, Native setter)
+{
+    Value value = NumberValue(valueArg);
+    return DefineElement(cx, obj, index, HandleValue::fromMarkedLocation(&value),
+                         attrs, getter, setter);
+}
+
+JS_PUBLIC_API(bool)
+JS_HasPropertyById(JSContext* cx, HandleObject obj, HandleId id, bool* foundp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+
+    return HasProperty(cx, obj, id, foundp);
+}
+
+JS_PUBLIC_API(bool)
+JS_HasProperty(JSContext* cx, HandleObject obj, const char* name, bool* foundp)
+{
+    JSAtom* atom = Atomize(cx, name, strlen(name));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return JS_HasPropertyById(cx, obj, id, foundp);
+}
+
+JS_PUBLIC_API(bool)
+JS_HasUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen, bool* foundp)
+{
+    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return JS_HasPropertyById(cx, obj, id, foundp);
+}
+
+JS_PUBLIC_API(bool)
+JS_HasElement(JSContext* cx, HandleObject obj, uint32_t index, bool* foundp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    RootedId id(cx);
+    if (!IndexToId(cx, index, &id))
+        return false;
+    return JS_HasPropertyById(cx, obj, id, foundp);
+}
+
+JS_PUBLIC_API(bool)
+JS_HasOwnPropertyById(JSContext* cx, HandleObject obj, HandleId id, bool* foundp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, id);
+
+    return HasOwnProperty(cx, obj, id, foundp);
+}
+
+JS_PUBLIC_API(bool)
+JS_HasOwnProperty(JSContext* cx, HandleObject obj, const char* name, bool* foundp)
+{
+    JSAtom* atom = Atomize(cx, name, strlen(name));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return JS_HasOwnPropertyById(cx, obj, id, foundp);
+}
+
+JS_PUBLIC_API(bool)
+JS_ForwardGetPropertyTo(JSContext* cx, HandleObject obj, HandleId id, HandleValue receiver,
+                        MutableHandleValue vp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, id, receiver);
+
+    return GetProperty(cx, obj, receiver, id, vp);
+}
+
+JS_PUBLIC_API(bool)
+JS_ForwardGetElementTo(JSContext* cx, HandleObject obj, uint32_t index, HandleObject receiver,
+                       MutableHandleValue vp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj);
+
+    return GetElement(cx, obj, receiver, index, vp);
+}
+
+JS_PUBLIC_API(bool)
+JS_GetPropertyById(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp)
+{
+    RootedValue receiver(cx, ObjectValue(*obj));
+    return JS_ForwardGetPropertyTo(cx, obj, id, receiver, vp);
+}
+
+JS_PUBLIC_API(bool)
+JS_GetProperty(JSContext* cx, HandleObject obj, const char* name, MutableHandleValue vp)
+{
+    JSAtom* atom = Atomize(cx, name, strlen(name));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return JS_GetPropertyById(cx, obj, id, vp);
+}
+
+JS_PUBLIC_API(bool)
+JS_GetUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                 MutableHandleValue vp)
+{
+    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return JS_GetPropertyById(cx, obj, id, vp);
+}
+
+JS_PUBLIC_API(bool)
+JS_GetElement(JSContext* cx, HandleObject objArg, uint32_t index, MutableHandleValue vp)
+{
+    return JS_ForwardGetElementTo(cx, objArg, index, objArg, vp);
+}
+
+JS_PUBLIC_API(bool)
+JS_ForwardSetPropertyTo(JSContext* cx, HandleObject obj, HandleId id, HandleValue v,
+                        HandleValue receiver, ObjectOpResult& result)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, id, receiver);
+
+    return SetProperty(cx, obj, id, v, receiver, result);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetPropertyById(JSContext* cx, HandleObject obj, HandleId id, HandleValue v)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, id);
+
+    RootedValue receiver(cx, ObjectValue(*obj));
+    ObjectOpResult ignored;
+    return SetProperty(cx, obj, id, v, receiver, ignored);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetProperty(JSContext* cx, HandleObject obj, const char* name, HandleValue v)
+{
+    JSAtom* atom = Atomize(cx, name, strlen(name));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return JS_SetPropertyById(cx, obj, id, v);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                 HandleValue v)
+{
+    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return JS_SetPropertyById(cx, obj, id, v);
+}
+
+static bool
+SetElement(JSContext* cx, HandleObject obj, uint32_t index, HandleValue v)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, v);
+
+    RootedValue receiver(cx, ObjectValue(*obj));
+    ObjectOpResult ignored;
+    return SetElement(cx, obj, index, v, receiver, ignored);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, HandleValue v)
+{
+    return SetElement(cx, obj, index, v);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, HandleObject v)
+{
+    RootedValue value(cx, ObjectOrNullValue(v));
+    return SetElement(cx, obj, index, value);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, HandleString v)
+{
+    RootedValue value(cx, StringValue(v));
+    return SetElement(cx, obj, index, value);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, int32_t v)
+{
+    RootedValue value(cx, NumberValue(v));
+    return SetElement(cx, obj, index, value);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, uint32_t v)
+{
+    RootedValue value(cx, NumberValue(v));
+    return SetElement(cx, obj, index, value);
+}
+
+JS_PUBLIC_API(bool)
+JS_SetElement(JSContext* cx, HandleObject obj, uint32_t index, double v)
+{
+    RootedValue value(cx, NumberValue(v));
+    return SetElement(cx, obj, index, value);
+}
+
+JS_PUBLIC_API(bool)
+JS_DeletePropertyById(JSContext* cx, HandleObject obj, HandleId id, ObjectOpResult& result)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, id);
+
+    return DeleteProperty(cx, obj, id, result);
+}
+
+JS_PUBLIC_API(bool)
+JS_DeleteProperty(JSContext* cx, HandleObject obj, const char* name, ObjectOpResult& result)
+{
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj);
+
+    JSAtom* atom = Atomize(cx, name, strlen(name));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return DeleteProperty(cx, obj, id, result);
+}
+
+JS_PUBLIC_API(bool)
+JS_DeleteUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                    ObjectOpResult& result)
+{
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj);
+
+    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return DeleteProperty(cx, obj, id, result);
+}
+
+JS_PUBLIC_API(bool)
+JS_DeleteElement(JSContext* cx, HandleObject obj, uint32_t index, ObjectOpResult& result)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj);
+
+    return DeleteElement(cx, obj, index, result);
+}
+
+JS_PUBLIC_API(bool)
+JS_DeletePropertyById(JSContext* cx, HandleObject obj, HandleId id)
+{
+    ObjectOpResult ignored;
+    return JS_DeletePropertyById(cx, obj, id, ignored);
+}
+
+JS_PUBLIC_API(bool)
+JS_DeleteProperty(JSContext* cx, HandleObject obj, const char* name)
+{
+    ObjectOpResult ignored;
+    return JS_DeleteProperty(cx, obj, name, ignored);
+}
+
+JS_PUBLIC_API(bool)
+JS_DeleteElement(JSContext* cx, HandleObject obj, uint32_t index)
+{
+    ObjectOpResult ignored;
+    return JS_DeleteElement(cx, obj, index, ignored);
+}
+
+JS_PUBLIC_API(bool)
+JS_Enumerate(JSContext* cx, HandleObject obj, JS::MutableHandle<IdVector> props)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj);
+    MOZ_ASSERT(props.empty());
+
+    AutoIdVector ids(cx);
+    if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY, &ids))
+        return false;
+
+    return props.append(ids.begin(), ids.end());
+}
+
+JS_PUBLIC_API(bool)
+JS::IsCallable(JSObject* obj)
+{
+    return obj->isCallable();
+}
+
+JS_PUBLIC_API(bool)
+JS::IsConstructor(JSObject* obj)
+{
+    return obj->isConstructor();
+}
+
+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);
+
+    InvokeArgs iargs(cx);
+    if (!FillArgumentsFromArraylike(cx, iargs, args))
+        return false;
+
+    RootedValue thisv(cx, ObjectOrNullValue(obj));
+    return Call(cx, fval, thisv, iargs, 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);
+
+    InvokeArgs iargs(cx);
+    if (!FillArgumentsFromArraylike(cx, iargs, args))
+        return false;
+
+    RootedValue fval(cx, ObjectValue(*fun));
+    RootedValue thisv(cx, ObjectOrNullValue(obj));
+    return Call(cx, fval, thisv, iargs, 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);
+
+    JSAtom* atom = Atomize(cx, name, strlen(name));
+    if (!atom)
+        return false;
+
+    RootedValue fval(cx);
+    RootedId id(cx, AtomToId(atom));
+    if (!GetProperty(cx, obj, obj, id, &fval))
+        return false;
+
+    InvokeArgs iargs(cx);
+    if (!FillArgumentsFromArraylike(cx, iargs, args))
+        return false;
+
+    RootedValue thisv(cx, ObjectOrNullValue(obj));
+    return Call(cx, fval, thisv, iargs, 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);
+
+    InvokeArgs iargs(cx);
+    if (!FillArgumentsFromArraylike(cx, iargs, args))
+        return false;
+
+    return Call(cx, fval, thisv, iargs, rval);
+}
+
+JS_PUBLIC_API(bool)
+JS::Construct(JSContext* cx, HandleValue fval, HandleObject newTarget, const JS::HandleValueArray& args,
+              MutableHandleObject objp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, fval, newTarget, args);
+
+    if (!IsConstructor(fval)) {
+        ReportValueError(cx, JSMSG_NOT_CONSTRUCTOR, JSDVG_IGNORE_STACK, fval, nullptr);
+        return false;
+    }
+
+    RootedValue newTargetVal(cx, ObjectValue(*newTarget));
+    if (!IsConstructor(newTargetVal)) {
+        ReportValueError(cx, JSMSG_NOT_CONSTRUCTOR, JSDVG_IGNORE_STACK, newTargetVal, nullptr);
+        return false;
+    }
+
+    ConstructArgs cargs(cx);
+    if (!FillArgumentsFromArraylike(cx, cargs, args))
+        return false;
+
+    return js::Construct(cx, fval, cargs, newTargetVal, objp);
+}
+
+JS_PUBLIC_API(bool)
+JS::Construct(JSContext* cx, HandleValue fval, const JS::HandleValueArray& args,
+              MutableHandleObject objp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, fval, args);
+
+    if (!IsConstructor(fval)) {
+        ReportValueError(cx, JSMSG_NOT_CONSTRUCTOR, JSDVG_IGNORE_STACK, fval, nullptr);
+        return false;
+    }
+
+    ConstructArgs cargs(cx);
+    if (!FillArgumentsFromArraylike(cx, cargs, args))
+        return false;
+
+    return js::Construct(cx, fval, cargs, fval, objp);
+}
+
+
+/* * */
+
+JS_PUBLIC_API(bool)
+JS_AlreadyHasOwnPropertyById(JSContext* cx, HandleObject obj, HandleId id, bool* foundp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj, id);
+
+    if (!obj->isNative())
+        return js::HasOwnProperty(cx, obj, id, foundp);
+
+    RootedNativeObject nativeObj(cx, &obj->as<NativeObject>());
+    RootedShape prop(cx);
+    NativeLookupOwnPropertyNoResolve(cx, nativeObj, id, &prop);
+    *foundp = !!prop;
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS_AlreadyHasOwnProperty(JSContext* cx, HandleObject obj, const char* name, bool* foundp)
+{
+    JSAtom* atom = Atomize(cx, name, strlen(name));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return JS_AlreadyHasOwnPropertyById(cx, obj, id, foundp);
+}
+
+JS_PUBLIC_API(bool)
+JS_AlreadyHasOwnUCProperty(JSContext* cx, HandleObject obj, const char16_t* name, size_t namelen,
+                           bool* foundp)
+{
+    JSAtom* atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
+    if (!atom)
+        return false;
+    RootedId id(cx, AtomToId(atom));
+    return JS_AlreadyHasOwnPropertyById(cx, obj, id, foundp);
+}
+
+JS_PUBLIC_API(bool)
+JS_AlreadyHasOwnElement(JSContext* cx, HandleObject obj, uint32_t index, bool* foundp)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    RootedId id(cx);
+    if (!IndexToId(cx, index, &id))
+        return false;
+    return JS_AlreadyHasOwnPropertyById(cx, obj, id, foundp);
+}
+
+JS_PUBLIC_API(bool)
+JS_FreezeObject(JSContext* cx, HandleObject obj)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj);
+    return FreezeObject(cx, obj);
+}
+
+static bool
+DeepFreezeSlot(JSContext* cx, const Value& v)
+{
+    if (v.isPrimitive())
+        return true;
+    RootedObject obj(cx, &v.toObject());
+    return JS_DeepFreezeObject(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()) {
+        RootedNativeObject nobj(cx, &obj->as<NativeObject>());
+        for (uint32_t i = 0, n = nobj->slotSpan(); i < n; ++i) {
+            if (!DeepFreezeSlot(cx, nobj->getSlot(i)))
+                return false;
+        }
+        for (uint32_t i = 0, n = nobj->getDenseInitializedLength(); i < n; ++i) {
+            if (!DeepFreezeSlot(cx, nobj->getDenseElement(i)))
+                return false;
+        }
+    }
+
+    return true;
+}
+
+static bool
+DefineSelfHostedProperty(JSContext* cx, HandleObject obj, HandleId id,
+                         const char* getterName, const char* setterName,
+                         unsigned attrs, unsigned flags)
+{
+    JSAtom* getterNameAtom = Atomize(cx, getterName, strlen(getterName));
+    if (!getterNameAtom)
+        return false;
+    RootedPropertyName getterNameName(cx, getterNameAtom->asPropertyName());
+
+    RootedAtom name(cx, IdToFunctionName(cx, id));
+    if (!name)
+        return false;
+
+    RootedValue getterValue(cx);
+    if (!GlobalObject::getSelfHostedFunction(cx, cx->global(), getterNameName, 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) {
+        JSAtom* setterNameAtom = Atomize(cx, setterName, strlen(setterName));
+        if (!setterNameAtom)
+            return false;
+        RootedPropertyName setterNameName(cx, setterNameAtom->asPropertyName());
+
+        RootedValue setterValue(cx);
+        if (!GlobalObject::getSelfHostedFunction(cx, cx->global(), setterNameName, name, 0,
+                                                 &setterValue))
+        {
+            return false;
+        }
+        MOZ_ASSERT(setterValue.isObject() && setterValue.toObject().is<JSFunction>());
+        setterFunc = &setterValue.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(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);
+}
+
+JS_PUBLIC_API(bool)
+JSPropertySpec::getValue(JSContext* cx, MutableHandleValue vp) const
+{
+    MOZ_ASSERT(!isAccessor());
+
+    if (value.type == JSVAL_TYPE_STRING) {
+        RootedAtom atom(cx, Atomize(cx, value.string, strlen(value.string)));
+        if (!atom)
+            return false;
+        vp.setString(atom);
+    } else {
+        MOZ_ASSERT(value.type == JSVAL_TYPE_INT32);
+        vp.setInt32(value.int32);
+    }
+
+    return true;
+}
+
+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);
+}
+
+bool
+PropertySpecNameToId(JSContext* cx, const char* name, MutableHandleId id,
+                     js::PinningBehavior pin = js::DoNotPinAtom)
+{
+    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), pin);
+        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::PinAtom);
+}
+
+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->isAccessor()) {
+            if (ps->isSelfHosted()) {
+                if (!DefineSelfHostedProperty(cx, obj, id,
+                                              ps->accessors.getter.selfHosted.funname,
+                                              ps->accessors.setter.selfHosted.funname,
+                                              ps->flags, 0))
+                {
+                    return false;
+                }
+            } else {
+                if (!DefinePropertyById(cx, obj, id, JS::UndefinedHandleValue,
+                                        ps->accessors.getter.native, ps->accessors.setter.native,
+                                        ps->flags, 0))
+                {
+                    return false;
+                }
+            }
+        } else {
+            RootedValue v(cx);
+            if (!ps->getValue(cx, &v))
+                return false;
+
+            if (!DefinePropertyById(cx, obj, id, v, NativeOpWrapper(nullptr),
+                                    NativeOpWrapper(nullptr), ps->flags & ~JSPROP_INTERNAL_USE_BIT, 0))
+            {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS::ObjectToCompletePropertyDescriptor(JSContext* cx,
+                                       HandleObject obj,
+                                       HandleValue descObj,
+                                       MutableHandle<PropertyDescriptor> desc)
+{
+    if (!ToPropertyDescriptor(cx, descObj, true, desc))
+        return false;
+    CompletePropertyDescriptor(desc);
+    desc.object().set(obj);
+    return true;
+}
+
+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(Value)
+JS_GetReservedSlot(JSObject* obj, uint32_t index)
+{
+    return obj->as<NativeObject>().getReservedSlot(index);
+}
+
+JS_PUBLIC_API(void)
+JS_SetReservedSlot(JSObject* obj, uint32_t index, const 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);
+}
+
+inline bool
+IsGivenTypeObject(JSContext* cx, JS::HandleObject obj, const ESClass& typeClass, bool* isType)
+{
+    assertSameCompartment(cx, obj);
+
+    ESClass cls;
+    if (!GetBuiltinClass(cx, obj, &cls))
+        return false;
+
+    *isType = cls == typeClass;
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS_IsArrayObject(JSContext* cx, JS::HandleObject obj, bool* isArray)
+{
+    return IsGivenTypeObject(cx, obj, ESClass::Array, isArray);
+}
+
+JS_PUBLIC_API(bool)
+JS_IsArrayObject(JSContext* cx, JS::HandleValue value, bool* isArray)
+{
+    if (!value.isObject()) {
+        *isArray = false;
+        return true;
+    }
+
+    RootedObject obj(cx, &value.toObject());
+    return JS_IsArrayObject(cx, obj, isArray);
+}
+
+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(bool)
+JS::IsMapObject(JSContext* cx, JS::HandleObject obj, bool* isMap)
+{
+    return IsGivenTypeObject(cx, obj, ESClass::Map, isMap);
+}
+
+JS_PUBLIC_API(bool)
+JS::IsSetObject(JSContext* cx, JS::HandleObject obj, bool* isSet)
+{
+    return IsGivenTypeObject(cx, obj, ESClass::Set, isSet);
+}
+
+JS_PUBLIC_API(void)
+JS_HoldPrincipals(JSPrincipals* principals)
+{
+    ++principals->refcount;
+}
+
+JS_PUBLIC_API(void)
+JS_DropPrincipals(JSContext* cx, JSPrincipals* principals)
+{
+    int rc = --principals->refcount;
+    if (rc == 0)
+        cx->destroyPrincipals(principals);
+}
+
+JS_PUBLIC_API(void)
+JS_SetSecurityCallbacks(JSContext* cx, const JSSecurityCallbacks* scb)
+{
+    MOZ_ASSERT(scb != &NullSecurityCallbacks);
+    cx->securityCallbacks = scb ? scb : &NullSecurityCallbacks;
+}
+
+JS_PUBLIC_API(const JSSecurityCallbacks*)
+JS_GetSecurityCallbacks(JSContext* cx)
+{
+    return (cx->securityCallbacks != &NullSecurityCallbacks) ? cx->securityCallbacks : nullptr;
+}
+
+JS_PUBLIC_API(void)
+JS_SetTrustedPrincipals(JSContext* cx, JSPrincipals* prin)
+{
+    cx->setTrustedPrincipals(prin);
+}
+
+extern JS_PUBLIC_API(void)
+JS_InitDestroyPrincipalsCallback(JSContext* cx, JSDestroyPrincipalsOp destroyPrincipals)
+{
+    MOZ_ASSERT(destroyPrincipals);
+    MOZ_ASSERT(!cx->destroyPrincipals);
+    cx->destroyPrincipals = destroyPrincipals;
+}
+
+extern JS_PUBLIC_API(void)
+JS_InitReadPrincipalsCallback(JSContext* cx, JSReadPrincipalsOp read)
+{
+    MOZ_ASSERT(read);
+    MOZ_ASSERT(!cx->readPrincipals);
+    cx->readPrincipals = read;
+}
+
+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::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;
+
+    JSAtom* shAtom = Atomize(cx, selfHostedName, strlen(selfHostedName));
+    if (!shAtom)
+        return nullptr;
+    RootedPropertyName shName(cx, shAtom->asPropertyName());
+    RootedValue funVal(cx);
+    if (!GlobalObject::getSelfHostedFunction(cx, cx->global(), shName, name, nargs, &funVal))
+        return nullptr;
+    return &funVal.toObject().as<JSFunction>();
+}
+
+JS_PUBLIC_API(JSFunction*)
+JS::NewFunctionFromSpec(JSContext* cx, const JSFunctionSpec* fs, HandleId id)
+{
+    // 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);
+
+        JSAtom* shAtom = Atomize(cx, fs->selfHostedName, strlen(fs->selfHostedName));
+        if (!shAtom)
+            return nullptr;
+        RootedPropertyName shName(cx, shAtom->asPropertyName());
+        RootedAtom name(cx, IdToFunctionName(cx, id));
+        if (!name)
+            return nullptr;
+        RootedValue funVal(cx);
+        if (!GlobalObject::getSelfHostedFunction(cx, cx->global(), shName, name, fs->nargs,
+                                                 &funVal))
+        {
+            return nullptr;
+        }
+        JSFunction* fun = &funVal.toObject().as<JSFunction>();
+        if (fs->flags & JSFUN_HAS_REST)
+            fun->setHasRest();
+        return fun;
+    }
+
+    RootedAtom atom(cx, IdToFunctionName(cx, id));
+    if (!atom)
+        return nullptr;
+
+    JSFunction* fun;
+    if (!fs->call.op)
+        fun = NewScriptedFunction(cx, fs->nargs, JSFunction::INTERPRETED_LAZY, atom);
+    else if (fs->flags & JSFUN_CONSTRUCTOR)
+        fun = NewNativeConstructor(cx, fs->call.op, fs->nargs, atom);
+    else
+        fun = NewNativeFunction(cx, fs->call.op, fs->nargs, atom);
+    if (!fun)
+        return nullptr;
+
+    if (fs->call.info)
+        fun->setJitInfo(fs->call.info);
+    return fun;
+}
+
+static bool
+CreateNonSyntacticEnvironmentChain(JSContext* cx, AutoObjectVector& envChain,
+                                   MutableHandleObject env, MutableHandleScope scope)
+{
+    RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+    if (!js::CreateObjectsForEnvironmentChain(cx, envChain, globalLexical, env))
+        return false;
+
+    if (!envChain.empty()) {
+        scope.set(GlobalScope::createEmpty(cx, ScopeKind::NonSyntactic));
+        if (!scope)
+            return false;
+
+        // The XPConnect subscript loader, which may pass in its own
+        // environments to load scripts in, expects the environment chain to
+        // be the holder of "var" declarations. In SpiderMonkey, such objects
+        // are called "qualified varobjs", the "qualified" part meaning the
+        // declaration was qualified by "var". There is only sadness.
+        //
+        // See JSObject::isQualifiedVarObj.
+        if (!env->setQualifiedVarObj(cx))
+            return false;
+
+        // Also get a non-syntactic lexical environment to capture 'let' and
+        // 'const' bindings. To persist lexical bindings, we have a 1-1
+        // mapping with the final unwrapped environment object (the
+        // environment that stores the 'var' bindings) and the lexical
+        // environment.
+        //
+        // TODOshu: disallow the subscript loader from using non-distinguished
+        // objects as dynamic scopes.
+        env.set(cx->compartment()->getOrCreateNonSyntacticLexicalEnvironment(cx, env));
+        if (!env)
+            return false;
+    } else {
+        scope.set(&cx->global()->emptyGlobalScope());
+    }
+
+    return true;
+}
+
+static bool
+IsFunctionCloneable(HandleFunction fun)
+{
+    if (!fun->isInterpreted())
+        return true;
+
+    // If a function was compiled with non-global syntactic environments on
+    // the environment chain, we could have baked in EnvironmentCoordinates
+    // into the script. We cannot clone it without breaking the compiler's
+    // assumptions.
+    for (ScopeIter si(fun->nonLazyScript()->enclosingScope()); si; si++) {
+        if (si.scope()->is<GlobalScope>())
+            return true;
+        if (si.hasSyntacticEnvironment())
+            return false;
+    }
+
+    return true;
+}
+
+static JSObject*
+CloneFunctionObject(JSContext* cx, HandleObject funobj, HandleObject env, HandleScope scope)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, env);
+    MOZ_ASSERT(env);
+    // 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)) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_BAD_CLONE_FUNOBJ_SCOPE);
+        return nullptr;
+    }
+
+    if (fun->isBoundFunction()) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_CLONE_OBJECT);
+        return nullptr;
+    }
+
+    if (IsAsmJSModule(fun)) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_CLONE_OBJECT);
+        return nullptr;
+    }
+
+    if (IsWrappedAsyncFunction(fun)) {
+        JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_CLONE_OBJECT);
+        return nullptr;
+    }
+
+    if (CanReuseScriptForClone(cx->compartment(), fun, env)) {
+        // If the script is to be reused, either the script can already handle
+        // non-syntactic scopes, or there is only the standard global lexical
+        // scope.
+#ifdef DEBUG
+        // Fail here if we OOM during debug asserting.
+        // CloneFunctionReuseScript will delazify the script anyways, so we
+        // are not creating an extra failure condition for DEBUG builds.
+        if (!fun->getOrCreateScript(cx))
+            return nullptr;
+        MOZ_ASSERT(scope->as<GlobalScope>().isSyntactic() ||
+                   fun->nonLazyScript()->hasNonSyntacticScope());
+#endif
+        return CloneFunctionReuseScript(cx, fun, env, fun->getAllocKind());
+    }
+
+    JSFunction* clone = CloneFunctionAndScript(cx, fun, env, scope, fun->getAllocKind());
+
+#ifdef DEBUG
+    // The cloned function should itself be cloneable.
+    RootedFunction cloneRoot(cx, clone);
+    MOZ_ASSERT_IF(cloneRoot, IsFunctionCloneable(cloneRoot));
+#endif
+
+    return clone;
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::CloneFunctionObject(JSContext* cx, HandleObject funobj)
+{
+    RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+    RootedScope emptyGlobalScope(cx, &cx->global()->emptyGlobalScope());
+    return CloneFunctionObject(cx, funobj, globalLexical, emptyGlobalScope);
+}
+
+extern JS_PUBLIC_API(JSObject*)
+JS::CloneFunctionObject(JSContext* cx, HandleObject funobj, AutoObjectVector& envChain)
+{
+    RootedObject env(cx);
+    RootedScope scope(cx);
+    if (!CreateNonSyntacticEnvironmentChain(cx, envChain, &env, &scope))
+        return nullptr;
+    return CloneFunctionObject(cx, funobj, env, scope);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_GetFunctionObject(JSFunction* fun)
+{
+    return fun;
+}
+
+JS_PUBLIC_API(JSString*)
+JS_GetFunctionId(JSFunction* fun)
+{
+    return fun->name();
+}
+
+JS_PUBLIC_API(JSString*)
+JS_GetFunctionDisplayId(JSFunction* fun)
+{
+    return fun->displayAtom();
+}
+
+JS_PUBLIC_API(uint16_t)
+JS_GetFunctionArity(JSFunction* fun)
+{
+    return fun->nargs();
+}
+
+JS_PUBLIC_API(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->isConstructor();
+}
+
+JS_PUBLIC_API(bool)
+JS_DefineFunctions(JSContext* cx, HandleObject obj, const JSFunctionSpec* fs)
+{
+    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, obj);
+
+    return DefineFunctions(cx, obj, fs, NotIntrinsic);
+}
+
+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);
+}
+
+/* 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_) {
+            /*
+             * Use Latin1 variant here because the encoding of filename is
+             * platform dependent.
+             */
+            JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr, JSMSG_CANT_OPEN,
+                                       filename, "No such file or directory");
+            return false;
+        }
+    }
+    return true;
+}
+
+void
+JS::TransitiveCompileOptions::copyPODTransitiveOptions(const TransitiveCompileOptions& rhs)
+{
+    mutedErrors_ = rhs.mutedErrors_;
+    version = rhs.version;
+    versionSet = rhs.versionSet;
+    utf8 = rhs.utf8;
+    selfHostingMode = rhs.selfHostingMode;
+    canLazilyParse = rhs.canLazilyParse;
+    strictOption = rhs.strictOption;
+    extraWarningsOption = rhs.extraWarningsOption;
+    werrorOption = rhs.werrorOption;
+    asmJSOption = rhs.asmJSOption;
+    throwOnAsmJSValidationFailureOption = rhs.throwOnAsmJSValidationFailureOption;
+    forceAsync = rhs.forceAsync;
+    installedFile = rhs.installedFile;
+    sourceIsLazy = rhs.sourceIsLazy;
+    introductionType = rhs.introductionType;
+    introductionLineno = rhs.introductionLineno;
+    introductionOffset = rhs.introductionOffset;
+    hasIntroductionInfo = rhs.hasIntroductionInfo;
+};
+
+void
+JS::ReadOnlyCompileOptions::copyPODOptions(const ReadOnlyCompileOptions& rhs)
+{
+    copyPODTransitiveOptions(rhs);
+    lineno = rhs.lineno;
+    column = rhs.column;
+    isRunOnce = rhs.isRunOnce;
+    noScriptRval = rhs.noScriptRval;
+}
+
+JS::OwningCompileOptions::OwningCompileOptions(JSContext* cx)
+    : ReadOnlyCompileOptions(),
+      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);
+
+    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)
+{
+    UniqueTwoByteChars 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();
+
+    strictOption = cx->options().strictMode();
+    extraWarningsOption = cx->compartment()->behaviors().extraWarnings(cx);
+    werrorOption = cx->options().werror();
+    if (!cx->options().asmJS())
+        asmJSOption = AsmJSOption::Disabled;
+    else if (cx->compartment()->debuggerObservesAsmJS())
+        asmJSOption = AsmJSOption::DisabledByDebugger;
+    else
+        asmJSOption = AsmJSOption::Enabled;
+    throwOnAsmJSValidationFailureOption = cx->options().throwOnAsmJSValidationFailure();
+}
+
+static bool
+Compile(JSContext* cx, const ReadOnlyCompileOptions& options, ScopeKind scopeKind,
+        SourceBufferHolder& srcBuf, MutableHandleScript script)
+{
+    MOZ_ASSERT(scopeKind == ScopeKind::Global || scopeKind == ScopeKind::NonSyntactic);
+    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+
+    script.set(frontend::CompileGlobalScript(cx, cx->tempLifoAlloc(), scopeKind, options, srcBuf));
+    return !!script;
+}
+
+static bool
+Compile(JSContext* cx, const ReadOnlyCompileOptions& options, ScopeKind scopeKind,
+        const char16_t* chars, size_t length, MutableHandleScript script)
+{
+    SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::NoOwnership);
+    return ::Compile(cx, options, scopeKind, srcBuf, script);
+}
+
+static bool
+Compile(JSContext* cx, const ReadOnlyCompileOptions& options, ScopeKind scopeKind,
+        const char* bytes, size_t length, MutableHandleScript script)
+{
+    UniqueTwoByteChars 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, scopeKind, chars.get(), length, script);
+}
+
+static bool
+Compile(JSContext* cx, const ReadOnlyCompileOptions& options, ScopeKind scopeKind,
+        FILE* fp, MutableHandleScript script)
+{
+    FileContents buffer(cx);
+    if (!ReadCompleteFile(cx, fp, buffer))
+        return false;
+
+    return ::Compile(cx, options, scopeKind, buffer.begin(), buffer.length(), script);
+}
+
+static bool
+Compile(JSContext* cx, const ReadOnlyCompileOptions& optionsArg, ScopeKind scopeKind,
+        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, scopeKind, file.fp(), script);
+}
+
+bool
+JS::Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
+            SourceBufferHolder& srcBuf, JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::Global, srcBuf, script);
+}
+
+bool
+JS::Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
+            const char* bytes, size_t length, JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::Global, bytes, length, script);
+}
+
+bool
+JS::Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
+            const char16_t* chars, size_t length, JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::Global, chars, length, script);
+}
+
+bool
+JS::Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
+            FILE* file, JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::Global, file, script);
+}
+
+bool
+JS::Compile(JSContext* cx, const ReadOnlyCompileOptions& options,
+            const char* filename, JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::Global, filename, script);
+}
+
+bool
+JS::CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
+                                SourceBufferHolder& srcBuf, JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::NonSyntactic, srcBuf, script);
+}
+
+bool
+JS::CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
+                                const char* bytes, size_t length, JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::NonSyntactic, bytes, length, script);
+}
+
+bool
+JS::CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
+                                const char16_t* chars, size_t length,
+                                JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::NonSyntactic, chars, length, script);
+}
+
+bool
+JS::CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
+                                FILE* file, JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::NonSyntactic, file, script);
+}
+
+bool
+JS::CompileForNonSyntacticScope(JSContext* cx, const ReadOnlyCompileOptions& options,
+                                const char* filename, JS::MutableHandleScript script)
+{
+    return ::Compile(cx, options, ScopeKind::NonSyntactic, filename, script);
+}
+
+JS_PUBLIC_API(bool)
+JS::CanCompileOffThread(JSContext* cx, const ReadOnlyCompileOptions& options, size_t length)
+{
+    static const size_t TINY_LENGTH = 5 * 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* cx, void* token)
+{
+    MOZ_ASSERT(cx);
+    MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx));
+    return HelperThreadState().finishScriptParseTask(cx, token);
+}
+
+JS_PUBLIC_API(void)
+JS::CancelOffThreadScript(JSContext* cx, void* token)
+{
+    MOZ_ASSERT(cx);
+    MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx));
+    HelperThreadState().cancelParseTask(cx, ParseTaskKind::Script, token);
+}
+
+JS_PUBLIC_API(bool)
+JS::CompileOffThreadModule(JSContext* cx, const ReadOnlyCompileOptions& options,
+                           const char16_t* chars, size_t length,
+                           OffThreadCompileCallback callback, void* callbackData)
+{
+    MOZ_ASSERT(CanCompileOffThread(cx, options, length));
+    return StartOffThreadParseModule(cx, options, chars, length, callback, callbackData);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::FinishOffThreadModule(JSContext* cx, void* token)
+{
+    MOZ_ASSERT(cx);
+    MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx));
+    return HelperThreadState().finishModuleParseTask(cx, token);
+}
+
+JS_PUBLIC_API(void)
+JS::CancelOffThreadModule(JSContext* cx, void* token)
+{
+    MOZ_ASSERT(cx);
+    MOZ_ASSERT(CurrentThreadCanAccessRuntime(cx));
+    HelperThreadState().cancelParseTask(cx, ParseTaskKind::Module, 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);
+    frontend::UsedNameTracker usedNames(cx);
+    if (!usedNames.init())
+        return false;
+    frontend::Parser<frontend::FullParseHandler> parser(cx, cx->tempLifoAlloc(),
+                                                        options, chars, length,
+                                                        /* foldConstants = */ true,
+                                                        usedNames, nullptr, nullptr);
+    JS::WarningReporter older = JS::SetWarningReporter(cx, nullptr);
+    if (!parser.checkOptions() || !parser.parse()) {
+        // 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::SetWarningReporter(cx, 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();
+}
+
+/*
+ * enclosingScope is a static enclosing scope, if any (e.g. a WithScope).  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 enclosingEnv, HandleScope enclosingScope,
+                MutableHandleFunction fun)
+{
+    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, enclosingEnv);
+    RootedAtom funAtom(cx);
+
+    if (name) {
+        funAtom = Atomize(cx, name, strlen(name));
+        if (!funAtom)
+            return false;
+    }
+
+    Rooted<PropertyNameVector> formals(cx, PropertyNameVector(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_NORMAL, funAtom,
+                                /* proto = */ nullptr,
+                                gc::AllocKind::FUNCTION, TenuredObject,
+                                enclosingEnv));
+    if (!fun)
+        return false;
+
+    // Make sure the static scope chain matches up when we have a
+    // non-syntactic scope.
+    MOZ_ASSERT_IF(!IsGlobalLexicalEnvironment(enclosingEnv),
+                  enclosingScope->hasOnChain(ScopeKind::NonSyntactic));
+
+    if (!frontend::CompileFunctionBody(cx, fun, optionsArg, formals, srcBuf, enclosingScope))
+        return false;
+
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS::CompileFunction(JSContext* cx, AutoObjectVector& envChain,
+                    const ReadOnlyCompileOptions& options,
+                    const char* name, unsigned nargs, const char* const* argnames,
+                    SourceBufferHolder& srcBuf, MutableHandleFunction fun)
+{
+    RootedObject env(cx);
+    RootedScope scope(cx);
+    if (!CreateNonSyntacticEnvironmentChain(cx, envChain, &env, &scope))
+        return false;
+    return CompileFunction(cx, options, name, nargs, argnames, srcBuf, env, scope, fun);
+}
+
+JS_PUBLIC_API(bool)
+JS::CompileFunction(JSContext* cx, AutoObjectVector& envChain,
+                    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, envChain, options, name, nargs, argnames,
+                           srcBuf, fun);
+}
+
+JS_PUBLIC_API(bool)
+JS::CompileFunction(JSContext* cx, AutoObjectVector& envChain,
+                    const ReadOnlyCompileOptions& options,
+                    const char* name, unsigned nargs, const char* const* argnames,
+                    const char* bytes, size_t length, MutableHandleFunction fun)
+{
+    UniqueTwoByteChars 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, envChain, 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, !(indent & JS_DONT_PRETTY_PRINT));
+}
+
+MOZ_NEVER_INLINE static bool
+ExecuteScript(JSContext* cx, HandleObject scope, HandleScript script, Value* rval)
+{
+    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, scope, script);
+    MOZ_ASSERT_IF(!IsGlobalLexicalEnvironment(scope), script->hasNonSyntacticScope());
+    return Execute(cx, script, *scope, rval);
+}
+
+static bool
+ExecuteScript(JSContext* cx, AutoObjectVector& envChain, HandleScript scriptArg, Value* rval)
+{
+    RootedObject env(cx);
+    RootedScope dummy(cx);
+    if (!CreateNonSyntacticEnvironmentChain(cx, envChain, &env, &dummy))
+        return false;
+
+    RootedScript script(cx, scriptArg);
+    if (!script->hasNonSyntacticScope() && !IsGlobalLexicalEnvironment(env)) {
+        script = CloneGlobalScript(cx, ScopeKind::NonSyntactic, script);
+        if (!script)
+            return false;
+        js::Debugger::onNewScript(cx, script);
+    }
+
+    return ExecuteScript(cx, env, script, rval);
+}
+
+MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
+JS_ExecuteScript(JSContext* cx, HandleScript scriptArg, MutableHandleValue rval)
+{
+    RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+    return ExecuteScript(cx, globalLexical, scriptArg, rval.address());
+}
+
+MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
+JS_ExecuteScript(JSContext* cx, HandleScript scriptArg)
+{
+    RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+    return ExecuteScript(cx, globalLexical, scriptArg, nullptr);
+}
+
+MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
+JS_ExecuteScript(JSContext* cx, AutoObjectVector& envChain,
+                 HandleScript scriptArg, MutableHandleValue rval)
+{
+    return ExecuteScript(cx, envChain, scriptArg, rval.address());
+}
+
+MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
+JS_ExecuteScript(JSContext* cx, AutoObjectVector& envChain, HandleScript scriptArg)
+{
+    return ExecuteScript(cx, envChain, scriptArg, nullptr);
+}
+
+JS_PUBLIC_API(bool)
+JS::CloneAndExecuteScript(JSContext* cx, HandleScript scriptArg,
+                          JS::MutableHandleValue rval)
+{
+    CHECK_REQUEST(cx);
+    RootedScript script(cx, scriptArg);
+    RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+    if (script->compartment() != cx->compartment()) {
+        script = CloneGlobalScript(cx, ScopeKind::Global, script);
+        if (!script)
+            return false;
+
+        js::Debugger::onNewScript(cx, script);
+    }
+    return ExecuteScript(cx, globalLexical, script, rval.address());
+}
+
+static const unsigned LARGE_SCRIPT_LENGTH = 500*1024;
+
+static bool
+Evaluate(JSContext* cx, ScopeKind scopeKind, HandleObject env,
+         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, env);
+    MOZ_ASSERT_IF(!IsGlobalLexicalEnvironment(env), scopeKind == ScopeKind::NonSyntactic);
+
+    options.setIsRunOnce(true);
+    SourceCompressionTask sct(cx);
+    RootedScript script(cx, frontend::CompileGlobalScript(cx, cx->tempLifoAlloc(),
+                                                          scopeKind, options, srcBuf, &sct));
+    if (!script)
+        return false;
+
+    MOZ_ASSERT(script->getVersion() == options.version);
+
+    bool result = Execute(cx, script, *env,
+                          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& envChain, const ReadOnlyCompileOptions& optionsArg,
+         SourceBufferHolder& srcBuf, MutableHandleValue rval)
+{
+    RootedObject env(cx);
+    RootedScope scope(cx);
+    if (!CreateNonSyntacticEnvironmentChain(cx, envChain, &env, &scope))
+        return false;
+    return ::Evaluate(cx, scope->kind(), env, 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);
+  RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+  return ::Evaluate(cx, ScopeKind::Global, globalLexical, 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);
+    RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+    bool ok = ::Evaluate(cx, ScopeKind::Global, globalLexical, 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)
+{
+    RootedObject globalLexical(cx, &cx->global()->lexicalEnvironment());
+    return ::Evaluate(cx, ScopeKind::Global, globalLexical, optionsArg, srcBuf, rval);
+}
+
+JS_PUBLIC_API(bool)
+JS::Evaluate(JSContext* cx, AutoObjectVector& envChain, const ReadOnlyCompileOptions& optionsArg,
+             SourceBufferHolder& srcBuf, MutableHandleValue rval)
+{
+    return ::Evaluate(cx, envChain, 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& envChain, const ReadOnlyCompileOptions& optionsArg,
+             const char16_t* chars, size_t length, MutableHandleValue rval)
+{
+    SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::NoOwnership);
+    return ::Evaluate(cx, envChain, 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(JSFunction*)
+JS::GetModuleResolveHook(JSContext* cx)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return cx->global()->moduleResolveHook();
+}
+
+JS_PUBLIC_API(void)
+JS::SetModuleResolveHook(JSContext* cx, HandleFunction func)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, func);
+    cx->global()->setModuleResolveHook(func);
+}
+
+JS_PUBLIC_API(bool)
+JS::CompileModule(JSContext* cx, const ReadOnlyCompileOptions& options,
+                  SourceBufferHolder& srcBuf, JS::MutableHandleObject module)
+{
+    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+
+    module.set(frontend::CompileModule(cx, options, srcBuf));
+    return !!module;
+}
+
+JS_PUBLIC_API(void)
+JS::SetModuleHostDefinedField(JSObject* module, const JS::Value& value)
+{
+    module->as<ModuleObject>().setHostDefinedField(value);
+}
+
+JS_PUBLIC_API(JS::Value)
+JS::GetModuleHostDefinedField(JSObject* module)
+{
+    return module->as<ModuleObject>().hostDefinedField();
+}
+
+JS_PUBLIC_API(bool)
+JS::ModuleDeclarationInstantiation(JSContext* cx, JS::HandleObject moduleArg)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, moduleArg);
+    return ModuleObject::DeclarationInstantiation(cx, moduleArg.as<ModuleObject>());
+}
+
+JS_PUBLIC_API(bool)
+JS::ModuleEvaluation(JSContext* cx, JS::HandleObject moduleArg)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, moduleArg);
+    return ModuleObject::Evaluation(cx, moduleArg.as<ModuleObject>());
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::GetRequestedModules(JSContext* cx, JS::HandleObject moduleArg)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, moduleArg);
+    return &moduleArg->as<ModuleObject>().requestedModules();
+}
+
+JS_PUBLIC_API(JSScript*)
+JS::GetModuleScript(JSContext* cx, JS::HandleObject moduleArg)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, moduleArg);
+    return moduleArg->as<ModuleObject>().script();
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_New(JSContext* cx, HandleObject ctor, const JS::HandleValueArray& inputArgs)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, ctor, inputArgs);
+
+    RootedValue ctorVal(cx, ObjectValue(*ctor));
+    if (!IsConstructor(ctorVal)) {
+        ReportValueError(cx, JSMSG_NOT_CONSTRUCTOR, JSDVG_IGNORE_STACK, ctorVal, nullptr);
+        return nullptr;
+    }
+
+    ConstructArgs args(cx);
+    if (!FillArgumentsFromArraylike(cx, args, inputArgs))
+        return nullptr;
+
+    RootedObject obj(cx);
+    if (!js::Construct(cx, ctorVal, args, ctorVal, &obj))
+        return nullptr;
+
+    return obj;
+}
+
+JS_PUBLIC_API(bool)
+JS_CheckForInterrupt(JSContext* cx)
+{
+    return js::CheckForInterrupt(cx);
+}
+
+JS_PUBLIC_API(bool)
+JS_AddInterruptCallback(JSContext* cx, JSInterruptCallback callback)
+{
+    return cx->interruptCallbacks.append(callback);
+}
+
+JS_PUBLIC_API(bool)
+JS_DisableInterruptCallback(JSContext* cx)
+{
+    bool result = cx->interruptCallbackDisabled;
+    cx->interruptCallbackDisabled = true;
+    return result;
+}
+
+JS_PUBLIC_API(void)
+JS_ResetInterruptCallback(JSContext* cx, bool enable)
+{
+    cx->interruptCallbackDisabled = enable;
+}
+
+/************************************************************************/
+
+/*
+ * Promises.
+ */
+JS_PUBLIC_API(void)
+JS::SetGetIncumbentGlobalCallback(JSContext* cx, JSGetIncumbentGlobalCallback callback)
+{
+    cx->getIncumbentGlobalCallback = callback;
+}
+
+JS_PUBLIC_API(void)
+JS::SetEnqueuePromiseJobCallback(JSContext* cx, JSEnqueuePromiseJobCallback callback,
+                                 void* data /* = nullptr */)
+{
+    cx->enqueuePromiseJobCallback = callback;
+    cx->enqueuePromiseJobCallbackData = data;
+}
+
+extern JS_PUBLIC_API(void)
+JS::SetPromiseRejectionTrackerCallback(JSContext* cx, JSPromiseRejectionTrackerCallback callback,
+                                       void* data /* = nullptr */)
+{
+    cx->promiseRejectionTrackerCallback = callback;
+    cx->promiseRejectionTrackerCallbackData = data;
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::NewPromiseObject(JSContext* cx, HandleObject executor, HandleObject proto /* = nullptr */)
+{
+    MOZ_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
+    MOZ_ASSERT(IsCallable(executor));
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, executor, proto);
+
+    return PromiseObject::create(cx, executor, proto);
+}
+
+JS_PUBLIC_API(bool)
+JS::IsPromiseObject(JS::HandleObject obj)
+{
+    return obj->is<PromiseObject>();
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::GetPromiseConstructor(JSContext* cx)
+{
+    CHECK_REQUEST(cx);
+    Rooted<GlobalObject*> global(cx, cx->global());
+    return GlobalObject::getOrCreatePromiseConstructor(cx, global);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::GetPromisePrototype(JSContext* cx)
+{
+    CHECK_REQUEST(cx);
+    Rooted<GlobalObject*> global(cx, cx->global());
+    return GlobalObject::getOrCreatePromisePrototype(cx, global);
+}
+
+JS_PUBLIC_API(JS::PromiseState)
+JS::GetPromiseState(JS::HandleObject promiseObj_)
+{
+    JSObject* promiseObj = CheckedUnwrap(promiseObj_);
+    if (!promiseObj || !promiseObj->is<PromiseObject>())
+        return JS::PromiseState::Pending;
+
+    return promiseObj->as<PromiseObject>().state();
+}
+
+JS_PUBLIC_API(uint64_t)
+JS::GetPromiseID(JS::HandleObject promise)
+{
+    return promise->as<PromiseObject>().getID();
+}
+
+JS_PUBLIC_API(JS::Value)
+JS::GetPromiseResult(JS::HandleObject promiseObj)
+{
+    PromiseObject* promise = &promiseObj->as<PromiseObject>();
+    MOZ_ASSERT(promise->state() != JS::PromiseState::Pending);
+    return promise->state() == JS::PromiseState::Fulfilled ? promise->value() : promise->reason();
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::GetPromiseAllocationSite(JS::HandleObject promise)
+{
+    return promise->as<PromiseObject>().allocationSite();
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::GetPromiseResolutionSite(JS::HandleObject promise)
+{
+    return promise->as<PromiseObject>().resolutionSite();
+}
+
+#ifdef DEBUG
+JS_PUBLIC_API(void)
+JS::DumpPromiseAllocationSite(JSContext* cx, JS::HandleObject promise)
+{
+    RootedObject stack(cx, promise->as<PromiseObject>().allocationSite());
+    UniqueChars stackStr(reinterpret_cast<char*>(BuildUTF8StackString(cx, stack).get()));
+    if (stackStr.get())
+        fputs(stackStr.get(), stderr);
+}
+
+JS_PUBLIC_API(void)
+JS::DumpPromiseResolutionSite(JSContext* cx, JS::HandleObject promise)
+{
+    RootedObject stack(cx, promise->as<PromiseObject>().resolutionSite());
+    UniqueChars stackStr(reinterpret_cast<char*>(BuildUTF8StackString(cx, stack).get()));
+    if (stackStr.get())
+        fputs(stackStr.get(), stderr);
+}
+#endif
+
+JS_PUBLIC_API(JSObject*)
+JS::CallOriginalPromiseResolve(JSContext* cx, JS::HandleValue resolutionValue)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, resolutionValue);
+
+    RootedObject promise(cx, PromiseObject::unforgeableResolve(cx, resolutionValue));
+    MOZ_ASSERT_IF(promise, promise->is<PromiseObject>());
+    return promise;
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::CallOriginalPromiseReject(JSContext* cx, JS::HandleValue rejectionValue)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, rejectionValue);
+
+    RootedObject promise(cx, PromiseObject::unforgeableReject(cx, rejectionValue));
+    MOZ_ASSERT_IF(promise, promise->is<PromiseObject>());
+    return promise;
+}
+
+static bool
+ResolveOrRejectPromise(JSContext* cx, JS::HandleObject promiseObj, JS::HandleValue resultOrReason_,
+                       bool reject)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, promiseObj, resultOrReason_);
+
+    mozilla::Maybe<AutoCompartment> ac;
+    Rooted<PromiseObject*> promise(cx);
+    RootedValue resultOrReason(cx, resultOrReason_);
+    if (IsWrapper(promiseObj)) {
+        JSObject* unwrappedPromiseObj = CheckedUnwrap(promiseObj);
+        if (!unwrappedPromiseObj) {
+            JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_OBJECT_ACCESS_DENIED);
+            return false;
+        }
+        promise = &unwrappedPromiseObj->as<PromiseObject>();
+        ac.emplace(cx, promise);
+        if (!cx->compartment()->wrap(cx, &resultOrReason))
+            return false;
+    } else {
+        promise = promiseObj.as<PromiseObject>();
+    }
+
+    return reject
+           ? promise->reject(cx, resultOrReason)
+           : promise->resolve(cx, resultOrReason);
+}
+
+JS_PUBLIC_API(bool)
+JS::ResolvePromise(JSContext* cx, JS::HandleObject promiseObj, JS::HandleValue resolutionValue)
+{
+    return ResolveOrRejectPromise(cx, promiseObj, resolutionValue, false);
+}
+
+JS_PUBLIC_API(bool)
+JS::RejectPromise(JSContext* cx, JS::HandleObject promiseObj, JS::HandleValue rejectionValue)
+{
+    return ResolveOrRejectPromise(cx, promiseObj, rejectionValue, true);
+}
+
+static bool
+CallOriginalPromiseThenImpl(JSContext* cx, JS::HandleObject promiseObj,
+                            JS::HandleObject onResolvedObj_, JS::HandleObject onRejectedObj_,
+                            JS::MutableHandleObject resultObj, bool createDependent)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, promiseObj, onResolvedObj_, onRejectedObj_);
+
+    MOZ_ASSERT_IF(onResolvedObj_, IsCallable(onResolvedObj_));
+    MOZ_ASSERT_IF(onRejectedObj_, IsCallable(onRejectedObj_));
+
+    {
+        mozilla::Maybe<AutoCompartment> ac;
+        Rooted<PromiseObject*> promise(cx);
+        RootedObject onResolvedObj(cx, onResolvedObj_);
+        RootedObject onRejectedObj(cx, onRejectedObj_);
+        if (IsWrapper(promiseObj)) {
+            JSObject* unwrappedPromiseObj = CheckedUnwrap(promiseObj);
+            if (!unwrappedPromiseObj) {
+                JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_OBJECT_ACCESS_DENIED);
+                return false;
+            }
+            promise = &unwrappedPromiseObj->as<PromiseObject>();
+            ac.emplace(cx, promise);
+            if (!cx->compartment()->wrap(cx, &onResolvedObj) ||
+                !cx->compartment()->wrap(cx, &onRejectedObj))
+            {
+                return false;
+            }
+        } else {
+            promise = promiseObj.as<PromiseObject>();
+        }
+
+        RootedValue onFulfilled(cx, ObjectOrNullValue(onResolvedObj));
+        RootedValue onRejected(cx, ObjectOrNullValue(onRejectedObj));
+        if (!OriginalPromiseThen(cx, promise, onFulfilled, onRejected, resultObj, createDependent))
+            return false;
+    }
+
+    if (resultObj) {
+        if (!cx->compartment()->wrap(cx, resultObj))
+            return false;
+    }
+    return true;
+
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::CallOriginalPromiseThen(JSContext* cx, JS::HandleObject promiseObj,
+                            JS::HandleObject onResolvedObj, JS::HandleObject onRejectedObj)
+{
+    RootedObject resultPromise(cx);
+    if (!CallOriginalPromiseThenImpl(cx, promiseObj, onResolvedObj, onRejectedObj, &resultPromise, true))
+        return nullptr;
+    return resultPromise;
+}
+
+JS_PUBLIC_API(bool)
+JS::AddPromiseReactions(JSContext* cx, JS::HandleObject promiseObj,
+                        JS::HandleObject onResolvedObj, JS::HandleObject onRejectedObj)
+{
+    RootedObject resultPromise(cx);
+    bool result = CallOriginalPromiseThenImpl(cx, promiseObj, onResolvedObj, onRejectedObj, &resultPromise, false);
+    MOZ_ASSERT(!resultPromise);
+    return result;
+}
+
+/**
+ * Unforgeable version of Promise.all for internal use.
+ *
+ * Takes a dense array of Promise objects and returns a promise that's
+ * resolved with an array of resolution values when all those promises ahve
+ * been resolved, or rejected with the rejection value of the first rejected
+ * promise.
+ *
+ * Asserts that the array is dense and all entries are Promise objects.
+ */
+JS_PUBLIC_API(JSObject*)
+JS::GetWaitForAllPromise(JSContext* cx, const JS::AutoObjectVector& promises)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+
+    return js::GetWaitForAllPromise(cx, promises);
+}
+
+JS_PUBLIC_API(void)
+JS::SetAsyncTaskCallbacks(JSContext* cx, JS::StartAsyncTaskCallback start,
+                          JS::FinishAsyncTaskCallback finish)
+{
+    cx->startAsyncTaskCallback = start;
+    cx->finishAsyncTaskCallback = finish;
+}
+
+JS_PUBLIC_API(void)
+JS_RequestInterruptCallback(JSContext* cx)
+{
+    cx->requestInterrupt(JSRuntime::RequestInterruptUrgent);
+}
+
+JS_PUBLIC_API(bool)
+JS_IsRunning(JSContext* cx)
+{
+    return cx->currentlyRunning();
+}
+
+JS::AutoSetAsyncStackForNewCalls::AutoSetAsyncStackForNewCalls(
+  JSContext* cx, HandleObject stack, const char* asyncCause,
+  JS::AutoSetAsyncStackForNewCalls::AsyncCallKind kind)
+  : cx(cx),
+    oldAsyncStack(cx, cx->asyncStackForNewActivations),
+    oldAsyncCause(cx->asyncCauseForNewActivations),
+    oldAsyncCallIsExplicit(cx->asyncCallIsExplicit)
+{
+    CHECK_REQUEST(cx);
+
+    // The option determines whether we actually use the new values at this
+    // point. It will not affect restoring the previous values when the object
+    // is destroyed, so if the option changes it won't cause consistency issues.
+    if (!cx->options().asyncStack())
+        return;
+
+    SavedFrame* asyncStack = &stack->as<SavedFrame>();
+
+    cx->asyncStackForNewActivations = asyncStack;
+    cx->asyncCauseForNewActivations = asyncCause;
+    cx->asyncCallIsExplicit = kind == AsyncCallKind::EXPLICIT;
+}
+
+JS::AutoSetAsyncStackForNewCalls::~AutoSetAsyncStackForNewCalls()
+{
+    cx->asyncCauseForNewActivations = oldAsyncCause;
+    cx->asyncStackForNewActivations =
+      oldAsyncStack ? &oldAsyncStack->as<SavedFrame>() : nullptr;
+    cx->asyncCallIsExplicit = oldAsyncCallIsExplicit;
+}
+
+/************************************************************************/
+JS_PUBLIC_API(JSString*)
+JS_NewStringCopyN(JSContext* cx, const char* s, size_t n)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return NewStringCopyN<CanGC>(cx, s, n);
+}
+
+JS_PUBLIC_API(JSString*)
+JS_NewStringCopyZ(JSContext* cx, const char* s)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    if (!s)
+        return cx->runtime()->emptyString;
+    return NewStringCopyZ<CanGC>(cx, s);
+}
+
+JS_PUBLIC_API(JSString*)
+JS_NewStringCopyUTF8Z(JSContext* cx, const JS::ConstUTF8CharsZ s)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return NewStringCopyUTF8Z<CanGC>(cx, s);
+}
+
+JS_PUBLIC_API(JSString*)
+JS_NewStringCopyUTF8N(JSContext* cx, const JS::UTF8Chars s)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return NewStringCopyUTF8N<CanGC>(cx, s);
+}
+
+JS_PUBLIC_API(bool)
+JS_StringHasBeenPinned(JSContext* cx, JSString* str)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+
+    if (!str->isAtom())
+        return false;
+
+    return AtomIsPinned(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_StringHasBeenPinned(cx, str));
+    return AtomToId(&str->asAtom());
+}
+
+JS_PUBLIC_API(JSString*)
+JS_AtomizeAndPinJSString(JSContext* cx, HandleString str)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    JSAtom* atom = AtomizeString(cx, str, PinAtom);
+    MOZ_ASSERT_IF(atom, JS_StringHasBeenPinned(cx, atom));
+    return atom;
+}
+
+JS_PUBLIC_API(JSString*)
+JS_AtomizeString(JSContext* cx, const char* s)
+{
+    return JS_AtomizeStringN(cx, s, strlen(s));
+}
+
+JS_PUBLIC_API(JSString*)
+JS_AtomizeStringN(JSContext* cx, const char* s, size_t length)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return Atomize(cx, s, length, DoNotPinAtom);
+}
+
+JS_PUBLIC_API(JSString*)
+JS_AtomizeAndPinString(JSContext* cx, const char* s)
+{
+    return JS_AtomizeAndPinStringN(cx, s, strlen(s));
+}
+
+JS_PUBLIC_API(JSString*)
+JS_AtomizeAndPinStringN(JSContext* cx, const char* s, size_t length)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    JSAtom* atom = Atomize(cx, s, length, PinAtom);
+    MOZ_ASSERT_IF(atom, JS_StringHasBeenPinned(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_AtomizeUCString(JSContext* cx, const char16_t* s)
+{
+    return JS_AtomizeUCStringN(cx, s, js_strlen(s));
+}
+
+JS_PUBLIC_API(JSString*)
+JS_AtomizeUCStringN(JSContext* cx, const char16_t* s, size_t length)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return AtomizeChars(cx, s, length, DoNotPinAtom);
+}
+
+JS_PUBLIC_API(JSString*)
+JS_AtomizeAndPinUCStringN(JSContext* cx, const char16_t* s, size_t length)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    JSAtom* atom = AtomizeChars(cx, s, length, PinAtom);
+    MOZ_ASSERT_IF(atom, JS_StringHasBeenPinned(cx, atom));
+    return atom;
+}
+
+JS_PUBLIC_API(JSString*)
+JS_AtomizeAndPinUCString(JSContext* cx, const char16_t* s)
+{
+    return JS_AtomizeAndPinUCStringN(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.begin().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_ReportErrorNumberASCII(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) {
+        ReportOutOfMemory(cx);
+        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);
+
+    return StringToNewUTF8CharsZ(cx, *str).release();
+}
+
+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, StringifyBehavior::Normal))
+        return false;
+    if (sb.empty() && !sb.append(cx->names().null))
+        return false;
+    return callback(sb.rawTwoByteBegin(), sb.length(), data);
+}
+
+JS_PUBLIC_API(bool)
+JS::ToJSONMaybeSafely(JSContext* cx, JS::HandleObject input,
+                      JSONWriteCallback callback, void* data)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, input);
+
+    StringBuffer sb(cx);
+    if (!sb.ensureTwoByteChars())
+        return false;
+
+    RootedValue inputValue(cx, ObjectValue(*input));
+    if (!Stringify(cx, &inputValue, nullptr, NullHandleValue, sb,
+                   StringifyBehavior::RestrictedSafe))
+        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_ReportErrorASCII(JSContext* cx, const char* format, ...)
+{
+    va_list ap;
+
+    AssertHeapIsIdle(cx);
+    va_start(ap, format);
+    ReportErrorVA(cx, JSREPORT_ERROR, format, ArgumentsAreASCII, ap);
+    va_end(ap);
+}
+
+JS_PUBLIC_API(void)
+JS_ReportErrorLatin1(JSContext* cx, const char* format, ...)
+{
+    va_list ap;
+
+    AssertHeapIsIdle(cx);
+    va_start(ap, format);
+    ReportErrorVA(cx, JSREPORT_ERROR, format, ArgumentsAreLatin1, ap);
+    va_end(ap);
+}
+
+JS_PUBLIC_API(void)
+JS_ReportErrorUTF8(JSContext* cx, const char* format, ...)
+{
+    va_list ap;
+
+    AssertHeapIsIdle(cx);
+    va_start(ap, format);
+    ReportErrorVA(cx, JSREPORT_ERROR, format, ArgumentsAreUTF8, ap);
+    va_end(ap);
+}
+
+JS_PUBLIC_API(void)
+JS_ReportErrorNumberASCII(JSContext* cx, JSErrorCallback errorCallback,
+                          void* userRef, const unsigned errorNumber, ...)
+{
+    va_list ap;
+    va_start(ap, errorNumber);
+    JS_ReportErrorNumberASCIIVA(cx, errorCallback, userRef, errorNumber, ap);
+    va_end(ap);
+}
+
+JS_PUBLIC_API(void)
+JS_ReportErrorNumberASCIIVA(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_ReportErrorNumberLatin1(JSContext* cx, JSErrorCallback errorCallback,
+                           void* userRef, const unsigned errorNumber, ...)
+{
+    va_list ap;
+    va_start(ap, errorNumber);
+    JS_ReportErrorNumberLatin1VA(cx, errorCallback, userRef, errorNumber, ap);
+    va_end(ap);
+}
+
+JS_PUBLIC_API(void)
+JS_ReportErrorNumberLatin1VA(JSContext* cx, JSErrorCallback errorCallback,
+                             void* userRef, const unsigned errorNumber,
+                             va_list ap)
+{
+    AssertHeapIsIdle(cx);
+    ReportErrorNumberVA(cx, JSREPORT_ERROR, errorCallback, userRef,
+                        errorNumber, ArgumentsAreLatin1, ap);
+}
+
+JS_PUBLIC_API(void)
+JS_ReportErrorNumberUTF8(JSContext* cx, JSErrorCallback errorCallback,
+                           void* userRef, const unsigned errorNumber, ...)
+{
+    va_list ap;
+    va_start(ap, errorNumber);
+    JS_ReportErrorNumberUTF8VA(cx, errorCallback, userRef, errorNumber, ap);
+    va_end(ap);
+}
+
+JS_PUBLIC_API(void)
+JS_ReportErrorNumberUTF8VA(JSContext* cx, JSErrorCallback errorCallback,
+                           void* userRef, const unsigned errorNumber,
+                           va_list ap)
+{
+    AssertHeapIsIdle(cx);
+    ReportErrorNumberVA(cx, JSREPORT_ERROR, errorCallback, userRef,
+                        errorNumber, ArgumentsAreUTF8, 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_ReportWarningASCII(JSContext* cx, const char* format, ...)
+{
+    va_list ap;
+    bool ok;
+
+    AssertHeapIsIdle(cx);
+    va_start(ap, format);
+    ok = ReportErrorVA(cx, JSREPORT_WARNING, format, ArgumentsAreASCII, ap);
+    va_end(ap);
+    return ok;
+}
+
+JS_PUBLIC_API(bool)
+JS_ReportWarningLatin1(JSContext* cx, const char* format, ...)
+{
+    va_list ap;
+    bool ok;
+
+    AssertHeapIsIdle(cx);
+    va_start(ap, format);
+    ok = ReportErrorVA(cx, JSREPORT_WARNING, format, ArgumentsAreLatin1, ap);
+    va_end(ap);
+    return ok;
+}
+
+JS_PUBLIC_API(bool)
+JS_ReportWarningUTF8(JSContext* cx, const char* format, ...)
+{
+    va_list ap;
+    bool ok;
+
+    AssertHeapIsIdle(cx);
+    va_start(ap, format);
+    ok = ReportErrorVA(cx, JSREPORT_WARNING, format, ArgumentsAreUTF8, ap);
+    va_end(ap);
+    return ok;
+}
+
+JS_PUBLIC_API(bool)
+JS_ReportErrorFlagsAndNumberASCII(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_ReportErrorFlagsAndNumberLatin1(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, ArgumentsAreLatin1, ap);
+    va_end(ap);
+    return ok;
+}
+
+JS_PUBLIC_API(bool)
+JS_ReportErrorFlagsAndNumberUTF8(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, ArgumentsAreUTF8, 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(JS::WarningReporter)
+JS::GetWarningReporter(JSContext* cx)
+{
+    return cx->warningReporter;
+}
+
+JS_PUBLIC_API(JS::WarningReporter)
+JS::SetWarningReporter(JSContext* cx, JS::WarningReporter reporter)
+{
+    WarningReporter older = cx->warningReporter;
+    cx->warningReporter = reporter;
+    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::NewDateObject(JSContext* cx, JS::ClippedTime time)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return NewDateObjectMsec(cx, time);
+}
+
+JS_PUBLIC_API(bool)
+JS_ObjectIsDate(JSContext* cx, HandleObject obj, bool* isDate)
+{
+    assertSameCompartment(cx, obj);
+
+    ESClass cls;
+    if (!GetBuiltinClass(cx, obj, &cls))
+        return false;
+
+    *isDate = cls == ESClass::Date;
+    return true;
+}
+
+/************************************************************************/
+
+/*
+ * Regular Expressions.
+ */
+JS_PUBLIC_API(JSObject*)
+JS_NewRegExpObject(JSContext* cx, 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;
+
+    RegExpObject* reobj = RegExpObject::create(cx, chars, length,
+                                               RegExpFlag(flags), nullptr, cx->tempLifoAlloc());
+    return reobj;
+}
+
+JS_PUBLIC_API(JSObject*)
+JS_NewUCRegExpObject(JSContext* cx, const char16_t* chars, size_t length, unsigned flags)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    return RegExpObject::create(cx, chars, length,
+                                RegExpFlag(flags), nullptr, cx->tempLifoAlloc());
+}
+
+JS_PUBLIC_API(bool)
+JS_SetRegExpInput(JSContext* cx, HandleObject obj, HandleString input)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, input);
+
+    RegExpStatics* res = obj->as<GlobalObject>().getRegExpStatics(cx);
+    if (!res)
+        return false;
+
+    res->reset(cx, input);
+    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(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, bool* isRegExp)
+{
+    assertSameCompartment(cx, obj);
+
+    ESClass cls;
+    if (!GetBuiltinClass(cx, obj, &cls))
+        return false;
+
+    *isRegExp = cls == ESClass::RegExp;
+    return true;
+}
+
+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(JSContext* cx, const char* locale)
+{
+    AssertHeapIsIdle(cx);
+    return cx->setDefaultLocale(locale);
+}
+
+JS_PUBLIC_API(UniqueChars)
+JS_GetDefaultLocale(JSContext* cx)
+{
+    AssertHeapIsIdle(cx);
+    if (const char* locale = cx->getDefaultLocale())
+        return UniqueChars(JS_strdup(cx, locale));
+
+    return nullptr;
+}
+
+JS_PUBLIC_API(void)
+JS_ResetDefaultLocale(JSContext* cx)
+{
+    AssertHeapIsIdle(cx);
+    cx->resetDefaultLocale();
+}
+
+JS_PUBLIC_API(void)
+JS_SetLocaleCallbacks(JSContext* cx, const JSLocaleCallbacks* callbacks)
+{
+    AssertHeapIsIdle(cx);
+    cx->localeCallbacks = callbacks;
+}
+
+JS_PUBLIC_API(const JSLocaleCallbacks*)
+JS_GetLocaleCallbacks(JSContext* cx)
+{
+    /* This function can be called by a finalizer. */
+    return cx->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::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);
+}
+
+void
+JSErrorReport::initBorrowedLinebuf(const char16_t* linebufArg, size_t linebufLengthArg,
+                                   size_t tokenOffsetArg)
+{
+    MOZ_ASSERT(linebufArg);
+    MOZ_ASSERT(tokenOffsetArg <= linebufLengthArg);
+    MOZ_ASSERT(linebufArg[linebufLengthArg] == '\0');
+
+    linebuf_ = linebufArg;
+    linebufLength_ = linebufLengthArg;
+    tokenOffset_ = tokenOffsetArg;
+}
+
+void
+JSErrorReport::freeLinebuf()
+{
+    if (ownsLinebuf_ && linebuf_) {
+        js_free((void*)linebuf_);
+        ownsLinebuf_ = false;
+    }
+    linebuf_ = nullptr;
+}
+
+JSString*
+JSErrorReport::newMessageString(JSContext* cx)
+{
+    if (!message_)
+        return cx->runtime()->emptyString;
+
+    return JS_NewStringCopyUTF8Z(cx, message_);
+}
+
+void
+JSErrorReport::freeMessage()
+{
+    if (ownsMessage_) {
+        js_free((void*)message_.get());
+        ownsMessage_ = false;
+    }
+    message_ = JS::ConstUTF8CharsZ();
+}
+
+JS_PUBLIC_API(bool)
+JS_ThrowStopIteration(JSContext* cx)
+{
+    AssertHeapIsIdle(cx);
+    return ThrowStopIteration(cx);
+}
+
+JS_PUBLIC_API(bool)
+JS_IsStopIteration(const Value& v)
+{
+    return v.isObject() && v.toObject().is<StopIterationObject>();
+}
+
+extern MOZ_NEVER_INLINE JS_PUBLIC_API(void)
+JS_AbortIfWrongThread(JSContext* cx)
+{
+    if (!CurrentThreadCanAccessRuntime(cx))
+        MOZ_CRASH();
+    if (!js::TlsPerThreadData.get()->associatedWith(cx))
+        MOZ_CRASH();
+}
+
+#ifdef JS_GC_ZEAL
+JS_PUBLIC_API(void)
+JS_GetGCZealBits(JSContext* cx, uint32_t* zealBits, uint32_t* frequency, uint32_t* nextScheduled)
+{
+    cx->runtime()->gc.getZealBits(zealBits, frequency, nextScheduled);
+}
+
+JS_PUBLIC_API(void)
+JS_SetGCZeal(JSContext* cx, uint8_t zeal, uint32_t frequency)
+{
+    cx->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(JSContext* cx, bool enabled)
+{
+    cx->setParallelParsingEnabled(enabled);
+}
+
+JS_PUBLIC_API(void)
+JS_SetOffthreadIonCompilationEnabled(JSContext* cx, bool enabled)
+{
+    cx->setOffthreadIonCompilationEnabled(enabled);
+}
+
+JS_PUBLIC_API(void)
+JS_SetGlobalJitCompilerOption(JSContext* cx, JSJitCompilerOption opt, uint32_t value)
+{
+    JSRuntime* rt = cx->runtime();
+    switch (opt) {
+      case JSJITCOMPILER_BASELINE_WARMUP_TRIGGER:
+        if (value == uint32_t(-1)) {
+            jit::DefaultJitOptions defaultValues;
+            value = defaultValues.baselineWarmUpThreshold;
+        }
+        jit::JitOptions.baselineWarmUpThreshold = value;
+        break;
+      case JSJITCOMPILER_ION_WARMUP_TRIGGER:
+        if (value == uint32_t(-1)) {
+            jit::JitOptions.resetCompilerWarmUpThreshold();
+            break;
+        }
+        jit::JitOptions.setCompilerWarmUpThreshold(value);
+        if (value == 0)
+            jit::JitOptions.setEagerCompilation();
+        break;
+      case JSJITCOMPILER_ION_GVN_ENABLE:
+        if (value == 0) {
+            jit::JitOptions.enableGvn(false);
+            JitSpew(js::jit::JitSpew_IonScripts, "Disable ion's GVN");
+        } else {
+            jit::JitOptions.enableGvn(true);
+            JitSpew(js::jit::JitSpew_IonScripts, "Enable ion's GVN");
+        }
+        break;
+      case JSJITCOMPILER_ION_FORCE_IC:
+        if (value == 0) {
+            jit::JitOptions.forceInlineCaches = false;
+            JitSpew(js::jit::JitSpew_IonScripts, "IonBuilder: Enable non-IC optimizations.");
+        } else {
+            jit::JitOptions.forceInlineCaches = true;
+            JitSpew(js::jit::JitSpew_IonScripts, "IonBuilder: Disable non-IC optimizations.");
+        }
+        break;
+      case JSJITCOMPILER_ION_CHECK_RANGE_ANALYSIS:
+        if (value == 0) {
+            jit::JitOptions.checkRangeAnalysis = false;
+            JitSpew(js::jit::JitSpew_IonScripts, "IonBuilder: Enable range analysis checks.");
+        } else {
+            jit::JitOptions.checkRangeAnalysis = true;
+            JitSpew(js::jit::JitSpew_IonScripts, "IonBuilder: Disable range analysis checks.");
+        }
+        break;
+      case JSJITCOMPILER_ION_ENABLE:
+        if (value == 1) {
+            JS::ContextOptionsRef(cx).setIon(true);
+            JitSpew(js::jit::JitSpew_IonScripts, "Enable ion");
+        } else if (value == 0) {
+            JS::ContextOptionsRef(cx).setIon(false);
+            JitSpew(js::jit::JitSpew_IonScripts, "Disable ion");
+        }
+        break;
+      case JSJITCOMPILER_BASELINE_ENABLE:
+        if (value == 1) {
+            JS::ContextOptionsRef(cx).setBaseline(true);
+            ReleaseAllJITCode(rt->defaultFreeOp());
+            JitSpew(js::jit::JitSpew_BaselineScripts, "Enable baseline");
+        } else if (value == 0) {
+            JS::ContextOptionsRef(cx).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_JUMP_THRESHOLD:
+        if (value == uint32_t(-1)) {
+            jit::DefaultJitOptions defaultValues;
+            value = defaultValues.jumpThreshold;
+        }
+        jit::JitOptions.jumpThreshold = value;
+        break;
+      case JSJITCOMPILER_ASMJS_ATOMICS_ENABLE:
+        jit::JitOptions.asmJSAtomicsEnable = !!value;
+        break;
+      case JSJITCOMPILER_WASM_TEST_MODE:
+        jit::JitOptions.wasmTestMode = !!value;
+        break;
+      case JSJITCOMPILER_WASM_FOLD_OFFSETS:
+        jit::JitOptions.wasmFoldOffsets = !!value;
+        break;
+      case JSJITCOMPILER_ION_INTERRUPT_WITHOUT_SIGNAL:
+        jit::JitOptions.ionInterruptWithoutSignals = !!value;
+        break;
+      default:
+        break;
+    }
+}
+
+JS_PUBLIC_API(bool)
+JS_GetGlobalJitCompilerOption(JSContext* cx, JSJitCompilerOption opt, uint32_t* valueOut)
+{
+    MOZ_ASSERT(valueOut);
+#ifndef JS_CODEGEN_NONE
+    JSRuntime* rt = cx->runtime();
+    switch (opt) {
+      case JSJITCOMPILER_BASELINE_WARMUP_TRIGGER:
+        *valueOut = jit::JitOptions.baselineWarmUpThreshold;
+        break;
+      case JSJITCOMPILER_ION_WARMUP_TRIGGER:
+        *valueOut = jit::JitOptions.forcedDefaultIonWarmUpThreshold.isSome()
+                  ? jit::JitOptions.forcedDefaultIonWarmUpThreshold.ref()
+                  : jit::OptimizationInfo::CompilerWarmupThreshold;
+        break;
+      case JSJITCOMPILER_ION_FORCE_IC:
+        *valueOut = jit::JitOptions.forceInlineCaches;
+        break;
+      case JSJITCOMPILER_ION_CHECK_RANGE_ANALYSIS:
+        *valueOut = jit::JitOptions.checkRangeAnalysis;
+        break;
+      case JSJITCOMPILER_ION_ENABLE:
+        *valueOut = JS::ContextOptionsRef(cx).ion();
+        break;
+      case JSJITCOMPILER_BASELINE_ENABLE:
+        *valueOut = JS::ContextOptionsRef(cx).baseline();
+        break;
+      case JSJITCOMPILER_OFFTHREAD_COMPILATION_ENABLE:
+        *valueOut = rt->canUseOffthreadIonCompilation();
+        break;
+      case JSJITCOMPILER_ASMJS_ATOMICS_ENABLE:
+        *valueOut = jit::JitOptions.asmJSAtomicsEnable ? 1 : 0;
+        break;
+      case JSJITCOMPILER_WASM_TEST_MODE:
+        *valueOut = jit::JitOptions.wasmTestMode ? 1 : 0;
+        break;
+      case JSJITCOMPILER_WASM_FOLD_OFFSETS:
+        *valueOut = jit::JitOptions.wasmFoldOffsets ? 1 : 0;
+        break;
+      case JSJITCOMPILER_ION_INTERRUPT_WITHOUT_SIGNAL:
+        *valueOut = jit::JitOptions.ionInterruptWithoutSignals ? 1 : 0;
+        break;
+      default:
+        return false;
+    }
+#else
+    *valueOut = 0;
+#endif
+    return true;
+}
+
+/************************************************************************/
+
+#if !defined(STATIC_EXPORTABLE_JS_API) && !defined(STATIC_JS_API) && defined(XP_WIN)
+
+#include "jswin.h"
+
+/*
+ * Initialization routine for the JS DLL.
+ */
+BOOL WINAPI DllMain (HINSTANCE hDLL, DWORD dwReason, LPVOID lpReserved)
+{
+    return TRUE;
+}
+
+#endif
+
+JS_PUBLIC_API(bool)
+JS_IndexToId(JSContext* cx, uint32_t index, MutableHandleId id)
+{
+    return IndexToId(cx, index, id);
+}
+
+JS_PUBLIC_API(bool)
+JS_CharsToId(JSContext* cx, JS::TwoByteChars chars, MutableHandleId idp)
+{
+    RootedAtom atom(cx, AtomizeChars(cx, chars.begin().get(), chars.length()));
+    if (!atom)
+        return false;
+#ifdef DEBUG
+    uint32_t dummy;
+    MOZ_ASSERT(!atom->isIndex(&dummy), "API misuse: |chars| must not encode an index");
+#endif
+    idp.set(AtomToId(atom));
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS_IsIdentifier(JSContext* cx, HandleString str, bool* isIdentifier)
+{
+    assertSameCompartment(cx, str);
+
+    JSLinearString* linearStr = str->ensureLinear(cx);
+    if (!linearStr)
+        return false;
+
+    *isIdentifier = js::frontend::IsIdentifier(linearStr);
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS_IsIdentifier(const char16_t* chars, size_t length)
+{
+    return js::frontend::IsIdentifier(chars, length);
+}
+
+namespace JS {
+
+void AutoFilename::reset()
+{
+    if (ss_) {
+        ss_->decref();
+        ss_ = nullptr;
+    }
+    if (filename_.is<const char*>())
+        filename_.as<const char*>() = nullptr;
+    else
+        filename_.as<UniqueChars>().reset();
+}
+
+void AutoFilename::setScriptSource(js::ScriptSource* p)
+{
+    MOZ_ASSERT(!ss_);
+    MOZ_ASSERT(!get());
+    ss_ = p;
+    if (p) {
+        p->incref();
+        setUnowned(p->filename());
+    }
+}
+
+void AutoFilename::setUnowned(const char* filename)
+{
+    MOZ_ASSERT(!get());
+    filename_.as<const char*>() = filename ? filename : "";
+}
+
+void AutoFilename::setOwned(UniqueChars&& filename)
+{
+    MOZ_ASSERT(!get());
+    filename_ = AsVariant(Move(filename));
+}
+
+const char* AutoFilename::get() const
+{
+    if (filename_.is<const char*>())
+        return filename_.as<const char*>();
+    return filename_.as<UniqueChars>().get();
+}
+
+JS_PUBLIC_API(bool)
+DescribeScriptedCaller(JSContext* cx, AutoFilename* filename, unsigned* lineno,
+                       unsigned* column)
+{
+    if (filename)
+        filename->reset();
+    if (lineno)
+        *lineno = 0;
+    if (column)
+        *column = 0;
+
+    if (!cx->compartment())
+        return false;
+
+    NonBuiltinFrameIter i(cx, cx->compartment()->principals());
+    if (i.done())
+        return false;
+
+    // If the caller is hidden, the embedding wants us to return false here so
+    // that it can check its own stack (see HideScriptedCaller).
+    if (i.activation()->scriptedCallerIsHidden())
+        return false;
+
+    if (filename) {
+        if (i.isWasm()) {
+            // For Wasm, copy out the filename, there is no script source.
+            UniqueChars copy = DuplicateString(i.filename() ? i.filename() : "");
+            if (!copy)
+                filename->setUnowned("out of memory");
+            else
+                filename->setOwned(Move(copy));
+        } else {
+            // All other frames have a script source to read the filename from.
+            filename->setScriptSource(i.scriptSource());
+        }
+    }
+
+    if (lineno)
+        *lineno = i.computeLine(column);
+    else if (column)
+        i.computeLine(column);
+
+    return true;
+}
+
+// Fast path to get the activation to use for GetScriptedCallerGlobal. If this
+// returns false, the fast path didn't work out and the caller has to use the
+// (much slower) NonBuiltinFrameIter path.
+//
+// The optimization here is that we skip Ion-inlined frames and only look at
+// 'outer' frames. That's fine: each activation is tied to a single compartment,
+// so if an activation contains at least one non-self-hosted frame, we can use
+// the activation's global for GetScriptedCallerGlobal. If, however, all 'outer'
+// frames are self-hosted, it's possible Ion inlined a non-self-hosted script,
+// so we must return false and use the slower path.
+static bool
+GetScriptedCallerActivationFast(JSContext* cx, Activation** activation)
+{
+    ActivationIterator activationIter(cx->runtime());
+
+    if (activationIter.done()) {
+        *activation = nullptr;
+        return true;
+    }
+
+    *activation = activationIter.activation();
+
+    if (activationIter->isJit()) {
+        for (jit::JitFrameIterator iter(activationIter); !iter.done(); ++iter) {
+            if (iter.isScripted() && !iter.script()->selfHosted())
+                return true;
+        }
+    } else if (activationIter->isInterpreter()) {
+        for (InterpreterFrameIterator iter((*activation)->asInterpreter()); !iter.done(); ++iter) {
+            if (!iter.frame()->script()->selfHosted())
+                return true;
+        }
+    }
+
+    return false;
+}
+
+JS_PUBLIC_API(JSObject*)
+GetScriptedCallerGlobal(JSContext* cx)
+{
+    Activation* activation;
+
+    if (GetScriptedCallerActivationFast(cx, &activation)) {
+        if (!activation)
+            return nullptr;
+    } else {
+        NonBuiltinFrameIter i(cx);
+        if (i.done())
+            return nullptr;
+        activation = i.activation();
+    }
+
+    // If the caller is hidden, the embedding wants us to return null here so
+    // that it can check its own stack (see HideScriptedCaller).
+    if (activation->scriptedCallerIsHidden())
+        return nullptr;
+
+    GlobalObject* global = activation->compartment()->maybeGlobal();
+
+    // Noone should be running code in the atoms compartment or running code in
+    // a compartment without any live objects, so there should definitely be a
+    // live global.
+    MOZ_ASSERT(global);
+
+    return global;
+}
+
+JS_PUBLIC_API(void)
+HideScriptedCaller(JSContext* cx)
+{
+    MOZ_ASSERT(cx);
+
+    // If there's no accessible activation on the stack, we'll return null from
+    // DescribeScriptedCaller anyway, so there's no need to annotate anything.
+    Activation* act = cx->runtime()->activation();
+    if (!act)
+        return;
+    act->hideScriptedCaller();
+}
+
+JS_PUBLIC_API(void)
+UnhideScriptedCaller(JSContext* cx)
+{
+    Activation* act = cx->runtime()->activation();
+    if (!act)
+        return;
+    act->unhideScriptedCaller();
+}
+
+} /* namespace JS */
+
+AutoGCRooter::AutoGCRooter(JSContext* cx, ptrdiff_t tag)
+  : AutoGCRooter(JS::RootingContext::get(cx), tag)
+{}
+
+AutoGCRooter::AutoGCRooter(JS::RootingContext* cx, ptrdiff_t tag)
+  : down(cx->roots.autoGCRooters_),
+    tag_(tag),
+    stackTop(&cx->roots.autoGCRooters_)
+{
+    MOZ_ASSERT(this != *stackTop);
+    *stackTop = this;
+}
+
+#ifdef JS_DEBUG
+JS_PUBLIC_API(void)
+JS::detail::AssertArgumentsAreSane(JSContext* cx, HandleValue value)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    assertSameCompartment(cx, value);
+}
+#endif /* JS_DEBUG */
+
+JS_PUBLIC_API(JS::TranscodeResult)
+JS::EncodeScript(JSContext* cx, TranscodeBuffer& buffer, HandleScript scriptArg)
+{
+    XDREncoder encoder(cx, buffer, buffer.length());
+    RootedScript script(cx, scriptArg);
+    if (!encoder.codeScript(&script))
+        buffer.clearAndFree();
+    MOZ_ASSERT(!buffer.empty() == (encoder.resultCode() == TranscodeResult_Ok));
+    return encoder.resultCode();
+}
+
+JS_PUBLIC_API(JS::TranscodeResult)
+JS::EncodeInterpretedFunction(JSContext* cx, TranscodeBuffer& buffer, HandleObject funobjArg)
+{
+    XDREncoder encoder(cx, buffer, buffer.length());
+    RootedFunction funobj(cx, &funobjArg->as<JSFunction>());
+    if (!encoder.codeFunction(&funobj))
+        buffer.clearAndFree();
+    MOZ_ASSERT(!buffer.empty() == (encoder.resultCode() == TranscodeResult_Ok));
+    return encoder.resultCode();
+}
+
+JS_PUBLIC_API(JS::TranscodeResult)
+JS::DecodeScript(JSContext* cx, TranscodeBuffer& buffer, JS::MutableHandleScript scriptp,
+                 size_t cursorIndex)
+{
+    XDRDecoder decoder(cx, buffer, cursorIndex);
+    decoder.codeScript(scriptp);
+    MOZ_ASSERT(bool(scriptp) == (decoder.resultCode() == TranscodeResult_Ok));
+    return decoder.resultCode();
+}
+
+JS_PUBLIC_API(JS::TranscodeResult)
+JS::DecodeInterpretedFunction(JSContext* cx, TranscodeBuffer& buffer,
+                              JS::MutableHandleFunction funp,
+                              size_t cursorIndex)
+{
+    XDRDecoder decoder(cx, buffer, cursorIndex);
+    decoder.codeFunction(funp);
+    MOZ_ASSERT(bool(funp) == (decoder.resultCode() == TranscodeResult_Ok));
+    return decoder.resultCode();
+}
+
+JS_PUBLIC_API(void)
+JS::SetBuildIdOp(JSContext* cx, JS::BuildIdOp buildIdOp)
+{
+    cx->runtime()->buildIdOp = buildIdOp;
+}
+
+JS_PUBLIC_API(void)
+JS::SetAsmJSCacheOps(JSContext* cx, const JS::AsmJSCacheOps* ops)
+{
+    cx->runtime()->asmJSCacheOps = *ops;
+}
+
+bool
+JS::IsWasmModuleObject(HandleObject obj)
+{
+    JSObject* unwrapped = CheckedUnwrap(obj);
+    if (!unwrapped)
+        return false;
+    return unwrapped->is<WasmModuleObject>();
+}
+
+JS_PUBLIC_API(RefPtr<JS::WasmModule>)
+JS::GetWasmModule(HandleObject obj)
+{
+    MOZ_ASSERT(JS::IsWasmModuleObject(obj));
+    return &CheckedUnwrap(obj)->as<WasmModuleObject>().module();
+}
+
+JS_PUBLIC_API(bool)
+JS::CompiledWasmModuleAssumptionsMatch(PRFileDesc* compiled, JS::BuildIdCharVector&& buildId)
+{
+    return wasm::CompiledModuleAssumptionsMatch(compiled, Move(buildId));
+}
+
+JS_PUBLIC_API(RefPtr<JS::WasmModule>)
+JS::DeserializeWasmModule(PRFileDesc* bytecode, PRFileDesc* maybeCompiled,
+                          JS::BuildIdCharVector&& buildId, UniqueChars file,
+                          unsigned line, unsigned column)
+{
+    return wasm::DeserializeModule(bytecode, maybeCompiled, Move(buildId), Move(file), line, column);
+}
+
+char*
+JSAutoByteString::encodeLatin1(ExclusiveContext* cx, JSString* str)
+{
+    mBytes = EncodeLatin1(cx, str);
+    return mBytes;
+}
+
+JS_PUBLIC_API(void)
+JS::SetLargeAllocationFailureCallback(JSContext* cx, JS::LargeAllocationFailureCallback lafc,
+                                      void* data)
+{
+    cx->largeAllocationFailureCallback = lafc;
+    cx->largeAllocationFailureCallbackData = data;
+}
+
+JS_PUBLIC_API(void)
+JS::SetOutOfMemoryCallback(JSContext* cx, OutOfMemoryCallback cb, void* data)
+{
+    cx->oomCallback = cb;
+    cx->oomCallbackData = data;
+}
+
+JS::FirstSubsumedFrame::FirstSubsumedFrame(JSContext* cx,
+                                           bool ignoreSelfHostedFrames /* = true */)
+  : JS::FirstSubsumedFrame(cx, cx->compartment()->principals(), ignoreSelfHostedFrames)
+{ }
+
+JS_PUBLIC_API(bool)
+JS::CaptureCurrentStack(JSContext* cx, JS::MutableHandleObject stackp,
+                        JS::StackCapture&& capture /* = JS::StackCapture(JS::AllFrames()) */)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    MOZ_RELEASE_ASSERT(cx->compartment());
+
+    JSCompartment* compartment = cx->compartment();
+    Rooted<SavedFrame*> frame(cx);
+    if (!compartment->savedStacks().saveCurrentStack(cx, &frame, mozilla::Move(capture)))
+        return false;
+    stackp.set(frame.get());
+    return true;
+}
+
+JS_PUBLIC_API(bool)
+JS::CopyAsyncStack(JSContext* cx, JS::HandleObject asyncStack,
+                   JS::HandleString asyncCause, JS::MutableHandleObject stackp,
+                   unsigned maxFrameCount)
+{
+    AssertHeapIsIdle(cx);
+    CHECK_REQUEST(cx);
+    MOZ_RELEASE_ASSERT(cx->compartment());
+
+    js::AssertObjectIsSavedFrameOrWrapper(cx, asyncStack);
+    JSCompartment* compartment = cx->compartment();
+    Rooted<SavedFrame*> frame(cx);
+    if (!compartment->savedStacks().copyAsyncStack(cx, asyncStack, asyncCause,
+                                                   &frame, maxFrameCount))
+        return false;
+    stackp.set(frame.get());
+    return true;
+}
+
+JS_PUBLIC_API(Zone*)
+JS::GetObjectZone(JSObject* obj)
+{
+    return obj->zone();
+}
+
+JS_PUBLIC_API(JS::TraceKind)
+JS::GCThingTraceKind(void* thing)
+{
+    MOZ_ASSERT(thing);
+    return static_cast<js::gc::Cell*>(thing)->getTraceKind();
+}
+
+JS_PUBLIC_API(void)
+js::SetStackFormat(JSContext* cx, js::StackFormat format)
+{
+    cx->setStackFormat(format);
+}
+
+JS_PUBLIC_API(js::StackFormat)
+js::GetStackFormat(JSContext* cx)
+{
+    return cx->stackFormat();
+}