The Tor Browser: js/src/jsapi.cpp@6474c204b198 (annotated)

js/src/jsapi.cpp@6474c204b198 (annotated)

js/src/jsapi.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- 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 <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 "jsfun.h"
 #include "jsgc.h"
 #include "jsiter.h"
 #include "jslock.h"
 #include "jsmath.h"
 #include "jsnum.h"
 #include "jsobj.h"
 #include "json.h"
 #include "jsprf.h"
 #include "jsproxy.h"
 #include "jsscript.h"
 #include "jsstr.h"
 #include "jstypes.h"
 #include "jsutil.h"
 #include "jswatchpoint.h"
 #include "jsweakmap.h"
 #ifdef JS_THREADSAFE
 #include "jsworkers.h"
 #endif
 #include "jswrapper.h"
 #include "prmjtime.h"
 #if ENABLE_YARR_JIT
 #include "assembler/jit/ExecutableAllocator.h"
 #endif
 #include "builtin/Eval.h"
 #include "builtin/Intl.h"
 #include "builtin/MapObject.h"
 #include "builtin/RegExp.h"
 #ifdef ENABLE_BINARYDATA
 #include "builtin/SIMD.h"
 #include "builtin/TypedObject.h"
 #endif
 #include "frontend/BytecodeCompiler.h"
 #include "frontend/FullParseHandler.h"  // for JS_BufferIsCompileableUnit
 #include "frontend/Parser.h" // for JS_BufferIsCompileableUnit
 #include "gc/Marking.h"
 #include "jit/AsmJSLink.h"
 #include "jit/JitCommon.h"
 #include "js/CharacterEncoding.h"
 #include "js/SliceBudget.h"
 #include "js/StructuredClone.h"
 #if ENABLE_INTL_API
 #include "unicode/uclean.h"
 #include "unicode/utypes.h"
 #endif // ENABLE_INTL_API
 #include "vm/DateObject.h"
 #include "vm/Debugger.h"
 #include "vm/ErrorObject.h"
 #include "vm/Interpreter.h"
 #include "vm/NumericConversions.h"
 #include "vm/RegExpStatics.h"
 #include "vm/Runtime.h"
 #include "vm/Shape.h"
 #include "vm/SharedArrayObject.h"
 #include "vm/StopIterationObject.h"
 #include "vm/StringBuffer.h"
 #include "vm/TypedArrayObject.h"
 #include "vm/WeakMapObject.h"
 #include "vm/WrapperObject.h"
 #include "vm/Xdr.h"
 #include "yarr/BumpPointerAllocator.h"
 #include "jsatominlines.h"
 #include "jsfuninlines.h"
 #include "jsinferinlines.h"
 #include "jsscriptinlines.h"
 #include "vm/Interpreter-inl.h"
 #include "vm/ObjectImpl-inl.h"
 #include "vm/String-inl.h"
 using namespace js;
 using namespace js::gc;
 using namespace js::types;
 using mozilla::Maybe;
 using mozilla::PodCopy;
 using mozilla::PodZero;
 using js::frontend::Parser;
 #ifdef HAVE_VA_LIST_AS_ARRAY
 #define JS_ADDRESSOF_VA_LIST(ap) ((va_list *)(ap))
 #else
 #define JS_ADDRESSOF_VA_LIST(ap) (&(ap))
 #endif
 /* Make sure that jschar is two bytes unsigned integer */
 JS_STATIC_ASSERT((jschar)-1 > 0);
 JS_STATIC_ASSERT(sizeof(jschar) == 2);
 JS_PUBLIC_API(int64_t)
 JS_Now()
 {
     return PRMJ_Now();
 }
 JS_PUBLIC_API(jsval)
 JS_GetNaNValue(JSContext *cx)
 {
     return cx->runtime()->NaNValue;
 }
 JS_PUBLIC_API(jsval)
 JS_GetNegativeInfinityValue(JSContext *cx)
 {
     return cx->runtime()->negativeInfinityValue;
 }
 JS_PUBLIC_API(jsval)
 JS_GetPositiveInfinityValue(JSContext *cx)
 {
     return cx->runtime()->positiveInfinityValue;
 }
 JS_PUBLIC_API(jsval)
 JS_GetEmptyStringValue(JSContext *cx)
 {
     return STRING_TO_JSVAL(cx->runtime()->emptyString);
 }
 JS_PUBLIC_API(JSString *)
 JS_GetEmptyString(JSRuntime *rt)
 {
     JS_ASSERT(rt->hasContexts());
     return rt->emptyString;
 }
 namespace js {
 void
 AssertHeapIsIdle(JSRuntime *rt)
 {
     JS_ASSERT(rt->heapState == js::Idle);
 }
 void
 AssertHeapIsIdle(JSContext *cx)
 {
     AssertHeapIsIdle(cx->runtime());
 }
 }
 static void
 AssertHeapIsIdleOrIterating(JSRuntime *rt)
 {
     JS_ASSERT(!rt->isHeapCollecting());
 }
 static void
 AssertHeapIsIdleOrIterating(JSContext *cx)
 {
     AssertHeapIsIdleOrIterating(cx->runtime());
 }
 static void
 AssertHeapIsIdleOrStringIsFlat(JSContext *cx, JSString *str)
 {
     /*
      * We allow some functions to be called during a GC as long as the argument
      * is a flat string, since that will not cause allocation.
      */
     JS_ASSERT_IF(cx->runtime()->isHeapBusy(), str->isFlat());
 }
 JS_PUBLIC_API(bool)
 JS_ConvertArguments(JSContext *cx, const CallArgs &args, const char *format, ...)
 {
     va_list ap;
     bool ok;
     AssertHeapIsIdle(cx);
     va_start(ap, format);
     ok = JS_ConvertArgumentsVA(cx, args, format, ap);
     va_end(ap);
     return ok;
 }
 JS_PUBLIC_API(bool)
 JS_ConvertArgumentsVA(JSContext *cx, const CallArgs &args, const char *format, va_list ap)
 {
     unsigned index = 0;
     bool required;
     char c;
     double d;
     JSString *str;
     RootedObject obj(cx);
     RootedValue val(cx);
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, args);
     required = true;
     while ((c = *format++) != '\0') {
         if (isspace(c))
             continue;
         if (c == '/') {
             required = false;
             continue;
         }
         if (index == args.length()) {
             if (required) {
                 if (JSFunction *fun = ReportIfNotFunction(cx, args.calleev())) {
                     char numBuf[12];
                     JS_snprintf(numBuf, sizeof numBuf, "%u", args.length());
                     JSAutoByteString funNameBytes;
                     if (const char *name = GetFunctionNameBytes(cx, fun, &funNameBytes)) {
                         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr,
                                              JSMSG_MORE_ARGS_NEEDED,
                                              name, numBuf, (args.length() == 1) ? "" : "s");
                     }
                 }
                 return false;
             }
             break;
         }
         MutableHandleValue arg = args[index++];
         switch (c) {
           case 'b':
             *va_arg(ap, bool *) = ToBoolean(arg);
             break;
           case 'c':
             if (!ToUint16(cx, arg, va_arg(ap, uint16_t *)))
                 return false;
             break;
           case 'i':
           case 'j': // "j" was broken, you should not use it.
             if (!ToInt32(cx, arg, va_arg(ap, int32_t *)))
                 return false;
             break;
           case 'u':
             if (!ToUint32(cx, arg, va_arg(ap, uint32_t *)))
                 return false;
             break;
           case 'd':
             if (!ToNumber(cx, arg, va_arg(ap, double *)))
                 return false;
             break;
           case 'I':
             if (!ToNumber(cx, arg, &d))
                 return false;
             *va_arg(ap, double *) = ToInteger(d);
             break;
           case 'S':
           case 'W':
             str = ToString<CanGC>(cx, arg);
             if (!str)
                 return false;
             arg.setString(str);
             if (c == 'W') {
                 JSFlatString *flat = str->ensureFlat(cx);
                 if (!flat)
                     return false;
                 *va_arg(ap, const jschar **) = flat->chars();
             } else {
                 *va_arg(ap, JSString **) = str;
             }
             break;
           case 'o':
             if (arg.isNullOrUndefined()) {
                 obj = nullptr;
             } else {
                 obj = ToObject(cx, arg);
                 if (!obj)
                     return false;
             }
             arg.setObjectOrNull(obj);
             *va_arg(ap, JSObject **) = obj;
             break;
           case 'f':
             obj = ReportIfNotFunction(cx, arg);
             if (!obj)
                 return false;
             arg.setObject(*obj);
             *va_arg(ap, JSFunction **) = &obj->as<JSFunction>();
             break;
           case 'v':
             *va_arg(ap, jsval *) = arg;
             break;
           case '*':
             break;
           default:
             JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_CHAR, format);
             return false;
         }
     }
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_ConvertValue(JSContext *cx, HandleValue value, JSType type, MutableHandleValue vp)
 {
     bool ok;
     RootedObject obj(cx);
     JSString *str;
     double d;
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, value);
     switch (type) {
       case JSTYPE_VOID:
         vp.setUndefined();
         ok = true;
         break;
       case JSTYPE_OBJECT:
         if (value.isNullOrUndefined()) {
             obj.set(nullptr);
         } else {
             obj = ToObject(cx, value);
             if (!obj)
                 return false;
         }
         ok = true;
         break;
       case JSTYPE_FUNCTION:
         vp.set(value);
         obj = ReportIfNotFunction(cx, vp);
         ok = (obj != nullptr);
         break;
       case JSTYPE_STRING:
         str = ToString<CanGC>(cx, value);
         ok = (str != nullptr);
         if (ok)
             vp.setString(str);
         break;
       case JSTYPE_NUMBER:
         ok = ToNumber(cx, value, &d);
         if (ok)
             vp.setDouble(d);
         break;
       case JSTYPE_BOOLEAN:
         vp.setBoolean(ToBoolean(value));
         return true;
       default: {
         char numBuf[12];
         JS_snprintf(numBuf, sizeof numBuf, "%d", (int)type);
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_TYPE, numBuf);
         ok = false;
         break;
       }
     }
     return ok;
 }
 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(int32_t)
 JS_DoubleToInt32(double d)
 {
     return ToInt32(d);
 }
 JS_PUBLIC_API(uint32_t)
 JS_DoubleToUint32(double d)
 {
     return ToUint32(d);
 }
 JS_PUBLIC_API(JSType)
 JS_TypeOfValue(JSContext *cx, HandleValue value)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, value);
     return TypeOfValue(value);
 }
 JS_PUBLIC_API(const char *)
 JS_GetTypeName(JSContext *cx, JSType type)
 {
     if ((unsigned)type >= (unsigned)JSTYPE_LIMIT)
         return nullptr;
     return TypeStrings[type];
 }
 JS_PUBLIC_API(bool)
 JS_StrictlyEqual(JSContext *cx, jsval value1, jsval value2, bool *equal)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, value1, value2);
     bool eq;
     if (!StrictlyEqual(cx, value1, value2, &eq))
         return false;
     *equal = eq;
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_LooselyEqual(JSContext *cx, HandleValue value1, HandleValue value2, bool *equal)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, value1, value2);
     JS_ASSERT(equal);
     return LooselyEqual(cx, value1, value2, equal);
 }
 JS_PUBLIC_API(bool)
 JS_SameValue(JSContext *cx, jsval value1, jsval value2, bool *same)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, value1, value2);
     bool s;
     if (!SameValue(cx, value1, value2, &s))
         return false;
     *same = s;
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_IsBuiltinEvalFunction(JSFunction *fun)
 {
     return IsAnyBuiltinEval(fun);
 }
 JS_PUBLIC_API(bool)
 JS_IsBuiltinFunctionConstructor(JSFunction *fun)
 {
     return fun->isBuiltinFunctionConstructor();
 }
 /************************************************************************/
 /*
  * SpiderMonkey's initialization status is tracked here, and it controls things
  * that should happen only once across all runtimes.  It's an API requirement
  * that JS_Init (and JS_ShutDown, if called) be called in a thread-aware
  * manner, so this variable doesn't need to be atomic.
  *
  * The only reason at present for the restriction that you can't call
  * JS_Init/stuff/JS_ShutDown multiple times is the Windows PRMJ NowInit
  * initialization code, which uses PR_CallOnce to initialize the PRMJ_Now
  * subsystem.  (For reinitialization to be permitted, we'd need to "reset" the
  * called-once status -- doable, but more trouble than it's worth now.)
  * Initializing that subsystem from JS_Init eliminates the problem, but
  * initialization can take a comparatively long time (15ms or so), so we
  * really don't want to do it in JS_Init, and we really do want to do it only
  * when PRMJ_Now is eventually called.
  */
 enum InitState { Uninitialized, Running, ShutDown };
 static InitState jsInitState = Uninitialized;
 #ifdef DEBUG
 static void
 CheckMessageNumbering()
 {
     // Assert that the numbers associated with the error names in js.msg are
     // monotonically increasing.  It's not a compile-time check, but it's
     // better than nothing.
     int errorNumber = 0;
 # define MSG_DEF(name, number, count, exception, format)                      \
     JS_ASSERT(name == errorNumber++);
 # include "js.msg"
 # undef MSG_DEF
 }
 static unsigned
 MessageParameterCount(const char *format)
 {
     unsigned numfmtspecs = 0;
     for (const char *fmt = format; *fmt != '\0'; fmt++) {
         if (*fmt == '{' && isdigit(fmt[1]))
             ++numfmtspecs;
     }
     return numfmtspecs;
 }
 static void
 CheckMessageParameterCounts()
 {
     // Assert that each message format has the correct number of braced
     // parameters.
 # define MSG_DEF(name, number, count, exception, format)                      \
     JS_BEGIN_MACRO                                                            \
         JS_ASSERT(MessageParameterCount(format) == count);                    \
     JS_END_MACRO;
 # include "js.msg"
 # undef MSG_DEF
 }
 #endif /* DEBUG */
 JS_PUBLIC_API(bool)
 JS_Init(void)
 {
     MOZ_ASSERT(jsInitState == Uninitialized,
                "must call JS_Init once before any JSAPI operation except "
                "JS_SetICUMemoryFunctions");
     MOZ_ASSERT(!JSRuntime::hasLiveRuntimes(),
                "how do we have live runtimes before JS_Init?");
 #ifdef DEBUG
     CheckMessageNumbering();
     CheckMessageParameterCounts();
 #endif
     using js::TlsPerThreadData;
     if (!TlsPerThreadData.initialized() && !TlsPerThreadData.init())
         return false;
 #if defined(JS_ION)
     if (!jit::InitializeIon())
         return false;
 #endif
     if (!ForkJoinContext::initialize())
         return false;
 #if EXPOSE_INTL_API
     UErrorCode err = U_ZERO_ERROR;
     u_init(&err);
     if (U_FAILURE(err))
         return false;
 #endif // EXPOSE_INTL_API
     jsInitState = Running;
     return true;
 }
 JS_PUBLIC_API(void)
 JS_ShutDown(void)
 {
     MOZ_ASSERT(jsInitState == Running,
                "JS_ShutDown must only be called after JS_Init and can't race with it");
 #ifdef DEBUG
     if (JSRuntime::hasLiveRuntimes()) {
         // Gecko is too buggy to assert this just yet.
         fprintf(stderr,
                 "WARNING: YOU ARE LEAKING THE WORLD (at least one JSRuntime "
                 "and everything alive inside it, that is) AT JS_ShutDown "
                 "TIME.  FIX THIS!\n");
     }
 #endif
 #ifdef JS_THREADSAFE
     WorkerThreadState().finish();
 #endif
     PRMJ_NowShutdown();
 #if EXPOSE_INTL_API
     u_cleanup();
 #endif // EXPOSE_INTL_API
     jsInitState = ShutDown;
 }
 #ifdef DEBUG
 JS_FRIEND_API(bool)
 JS::isGCEnabled()
 {
     return !TlsPerThreadData.get()->suppressGC;
 }
 #else
 JS_FRIEND_API(bool) JS::isGCEnabled() { return true; }
 #endif
 JS_PUBLIC_API(JSRuntime *)
 JS_NewRuntime(uint32_t maxbytes, JSUseHelperThreads useHelperThreads, JSRuntime *parentRuntime)
 {
     MOZ_ASSERT(jsInitState == Running,
                "must call JS_Init prior to creating any JSRuntimes");
     // Any parent runtime should be the topmost parent. This assert
     // isn't required for correctness, but ensuring that the parent
     // runtime is not destroyed before this one is more easily done
     // for the main runtime in the process.
     JS_ASSERT_IF(parentRuntime, !parentRuntime->parentRuntime);
     JSRuntime *rt = js_new<JSRuntime>(parentRuntime, useHelperThreads);
     if (!rt)
         return nullptr;
     if (!rt->init(maxbytes)) {
         JS_DestroyRuntime(rt);
         return nullptr;
     }
     return rt;
 }
 JS_PUBLIC_API(void)
 JS_DestroyRuntime(JSRuntime *rt)
 {
     js_delete(rt);
 }
 JS_PUBLIC_API(bool)
 JS_SetICUMemoryFunctions(JS_ICUAllocFn allocFn, JS_ICUReallocFn reallocFn, JS_ICUFreeFn freeFn)
 {
     MOZ_ASSERT(jsInitState == Uninitialized,
                "must call JS_SetICUMemoryFunctions before any other JSAPI "
                "operation (including JS_Init)");
 #if EXPOSE_INTL_API
     UErrorCode status = U_ZERO_ERROR;
     u_setMemoryFunctions(/* context = */ nullptr, allocFn, reallocFn, freeFn, &status);
     return U_SUCCESS(status);
 #else
     return true;
 #endif
 }
 JS_PUBLIC_API(void *)
 JS_GetRuntimePrivate(JSRuntime *rt)
 {
     return rt->data;
 }
 JS_PUBLIC_API(void)
 JS_SetRuntimePrivate(JSRuntime *rt, void *data)
 {
     rt->data = data;
 }
 #ifdef JS_THREADSAFE
 static void
 StartRequest(JSContext *cx)
 {
     JSRuntime *rt = cx->runtime();
     JS_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();
     JS_ASSERT(CurrentThreadCanAccessRuntime(rt));
     JS_ASSERT(rt->requestDepth != 0);
     if (rt->requestDepth != 1) {
         rt->requestDepth--;
     } else {
         rt->conservativeGC.updateForRequestEnd();
         rt->requestDepth = 0;
         rt->triggerActivityCallback(false);
     }
 }
 #endif /* JS_THREADSAFE */
 JS_PUBLIC_API(void)
 JS_BeginRequest(JSContext *cx)
 {
 #ifdef JS_THREADSAFE
     cx->outstandingRequests++;
     StartRequest(cx);
 #endif
 }
 JS_PUBLIC_API(void)
 JS_EndRequest(JSContext *cx)
 {
 #ifdef JS_THREADSAFE
     JS_ASSERT(cx->outstandingRequests != 0);
     cx->outstandingRequests--;
     StopRequest(cx);
 #endif
 }
 JS_PUBLIC_API(bool)
 JS_IsInRequest(JSRuntime *rt)
 {
 #ifdef JS_THREADSAFE
     JS_ASSERT(CurrentThreadCanAccessRuntime(rt));
     return rt->requestDepth != 0;
 #else
     return false;
 #endif
 }
 JS_PUBLIC_API(void)
 JS_SetContextCallback(JSRuntime *rt, JSContextCallback cxCallback, void *data)
 {
     rt->cxCallback = cxCallback;
     rt->cxCallbackData = data;
 }
 JS_PUBLIC_API(JSContext *)
 JS_NewContext(JSRuntime *rt, size_t stackChunkSize)
 {
     return NewContext(rt, stackChunkSize);
 }
 JS_PUBLIC_API(void)
 JS_DestroyContext(JSContext *cx)
 {
     JS_ASSERT(!cx->compartment());
     DestroyContext(cx, DCM_FORCE_GC);
 }
 JS_PUBLIC_API(void)
 JS_DestroyContextNoGC(JSContext *cx)
 {
     JS_ASSERT(!cx->compartment());
     DestroyContext(cx, DCM_NO_GC);
 }
 JS_PUBLIC_API(void *)
 JS_GetContextPrivate(JSContext *cx)
 {
     return cx->data;
 }
 JS_PUBLIC_API(void)
 JS_SetContextPrivate(JSContext *cx, void *data)
 {
     cx->data = data;
 }
 JS_PUBLIC_API(void *)
 JS_GetSecondContextPrivate(JSContext *cx)
 {
     return cx->data2;
 }
 JS_PUBLIC_API(void)
 JS_SetSecondContextPrivate(JSContext *cx, void *data)
 {
     cx->data2 = data;
 }
 JS_PUBLIC_API(JSRuntime *)
 JS_GetRuntime(JSContext *cx)
 {
     return cx->runtime();
 }
 JS_PUBLIC_API(JSRuntime *)
 JS_GetParentRuntime(JSContext *cx)
 {
     JSRuntime *rt = cx->runtime();
     return rt->parentRuntime ? rt->parentRuntime : rt;
 }
 JS_PUBLIC_API(JSContext *)
 JS_ContextIterator(JSRuntime *rt, JSContext **iterp)
 {
     JSContext *cx = *iterp;
     cx = cx ? cx->getNext() : rt->contextList.getFirst();
     *iterp = cx;
     return cx;
 }
 JS_PUBLIC_API(JSVersion)
 JS_GetVersion(JSContext *cx)
 {
     return VersionNumber(cx->findVersion());
 }
 JS_PUBLIC_API(void)
 JS_SetVersionForCompartment(JSCompartment *compartment, JSVersion version)
 {
     compartment->options().setVersion(version);
 }
 static const struct v2smap {
     JSVersion   version;
     const char  *string;
 } v2smap[] = {
     {JSVERSION_ECMA_3,  "ECMAv3"},
     {JSVERSION_1_6,     "1.6"},
     {JSVERSION_1_7,     "1.7"},
     {JSVERSION_1_8,     "1.8"},
     {JSVERSION_ECMA_5,  "ECMAv5"},
     {JSVERSION_DEFAULT, js_default_str},
     {JSVERSION_DEFAULT, "1.0"},
     {JSVERSION_DEFAULT, "1.1"},
     {JSVERSION_DEFAULT, "1.2"},
     {JSVERSION_DEFAULT, "1.3"},
     {JSVERSION_DEFAULT, "1.4"},
     {JSVERSION_DEFAULT, "1.5"},
     {JSVERSION_UNKNOWN, nullptr},          /* must be last, nullptr is sentinel */
 };
 JS_PUBLIC_API(const char *)
 JS_VersionToString(JSVersion version)
 {
     int i;
     for (i = 0; v2smap[i].string; i++)
         if (v2smap[i].version == version)
             return v2smap[i].string;
     return "unknown";
 }
 JS_PUBLIC_API(JSVersion)
 JS_StringToVersion(const char *string)
 {
     int i;
     for (i = 0; v2smap[i].string; i++)
         if (strcmp(v2smap[i].string, string) == 0)
             return v2smap[i].version;
     return JSVERSION_UNKNOWN;
 }
 JS_PUBLIC_API(JS::RuntimeOptions &)
 JS::RuntimeOptionsRef(JSRuntime *rt)
 {
     return rt->options();
 }
 JS_PUBLIC_API(JS::RuntimeOptions &)
 JS::RuntimeOptionsRef(JSContext *cx)
 {
     return cx->runtime()->options();
 }
 JS_PUBLIC_API(JS::ContextOptions &)
 JS::ContextOptionsRef(JSContext *cx)
 {
     return cx->options();
 }
 JS_PUBLIC_API(const char *)
 JS_GetImplementationVersion(void)
 {
     return "JavaScript-C" MOZILLA_VERSION;
 }
 JS_PUBLIC_API(void)
 JS_SetDestroyCompartmentCallback(JSRuntime *rt, JSDestroyCompartmentCallback callback)
 {
     rt->destroyCompartmentCallback = callback;
 }
 JS_PUBLIC_API(void)
 JS_SetDestroyZoneCallback(JSRuntime *rt, JSZoneCallback callback)
 {
     rt->destroyZoneCallback = callback;
 }
 JS_PUBLIC_API(void)
 JS_SetSweepZoneCallback(JSRuntime *rt, JSZoneCallback callback)
 {
     rt->sweepZoneCallback = callback;
 }
 JS_PUBLIC_API(void)
 JS_SetCompartmentNameCallback(JSRuntime *rt, JSCompartmentNameCallback callback)
 {
     rt->compartmentNameCallback = callback;
 }
 JS_PUBLIC_API(void)
 JS_SetWrapObjectCallbacks(JSRuntime *rt, const JSWrapObjectCallbacks *callbacks)
 {
     rt->wrapObjectCallbacks = callbacks;
 }
 JS_PUBLIC_API(JSCompartment *)
 JS_EnterCompartment(JSContext *cx, JSObject *target)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JSCompartment *oldCompartment = cx->compartment();
     cx->enterCompartment(target->compartment());
     return oldCompartment;
 }
 JS_PUBLIC_API(JSCompartment *)
 JS_EnterCompartmentOfScript(JSContext *cx, JSScript *target)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     GlobalObject &global = target->global();
     return JS_EnterCompartment(cx, &global);
 }
 JS_PUBLIC_API(void)
 JS_LeaveCompartment(JSContext *cx, JSCompartment *oldCompartment)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     cx->leaveCompartment(oldCompartment);
 }
 JSAutoCompartment::JSAutoCompartment(JSContext *cx, JSObject *target)
   : cx_(cx),
     oldCompartment_(cx->compartment())
 {
     AssertHeapIsIdleOrIterating(cx_);
     cx_->enterCompartment(target->compartment());
 }
 JSAutoCompartment::JSAutoCompartment(JSContext *cx, JSScript *target)
   : cx_(cx),
     oldCompartment_(cx->compartment())
 {
     AssertHeapIsIdleOrIterating(cx_);
     cx_->enterCompartment(target->compartment());
 }
 JSAutoCompartment::~JSAutoCompartment()
 {
     cx_->leaveCompartment(oldCompartment_);
 }
 JSAutoNullCompartment::JSAutoNullCompartment(JSContext *cx)
   : cx_(cx),
     oldCompartment_(cx->compartment())
 {
     AssertHeapIsIdleOrIterating(cx_);
     cx_->enterNullCompartment();
 }
 JSAutoNullCompartment::~JSAutoNullCompartment()
 {
     cx_->leaveCompartment(oldCompartment_);
 }
 JS_PUBLIC_API(void)
 JS_SetCompartmentPrivate(JSCompartment *compartment, void *data)
 {
     compartment->data = data;
 }
 JS_PUBLIC_API(void *)
 JS_GetCompartmentPrivate(JSCompartment *compartment)
 {
     return compartment->data;
 }
 JS_PUBLIC_API(void)
 JS_SetZoneUserData(JS::Zone *zone, void *data)
 {
     zone->data = data;
 }
 JS_PUBLIC_API(void *)
 JS_GetZoneUserData(JS::Zone *zone)
 {
     return zone->data;
 }
 JS_PUBLIC_API(bool)
 JS_WrapObject(JSContext *cx, MutableHandleObject objp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (objp)
         JS::ExposeGCThingToActiveJS(objp, JSTRACE_OBJECT);
     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);
 }
 JS_PUBLIC_API(bool)
 JS_WrapId(JSContext *cx, JS::MutableHandleId idp)
 {
   AssertHeapIsIdle(cx);
   CHECK_REQUEST(cx);
   jsid id = idp.get();
   if (JSID_IS_STRING(id))
       JS::ExposeGCThingToActiveJS(JSID_TO_STRING(id), JSTRACE_STRING);
   else if (JSID_IS_OBJECT(id))
       JS::ExposeGCThingToActiveJS(JSID_TO_OBJECT(id), JSTRACE_OBJECT);
   return cx->compartment()->wrapId(cx, idp.address());
 }
 /*
  * 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);
     JS_ASSERT(origobj != target);
     JS_ASSERT(!origobj->is<CrossCompartmentWrapperObject>());
     JS_ASSERT(!target->is<CrossCompartmentWrapperObject>());
     RootedValue origv(cx, ObjectValue(*origobj));
     RootedObject newIdentity(cx);
     {
         // Scope to make ~AutoMaybeTouchDeadZones do its GC before the return value is on the stack.
         AutoMaybeTouchDeadZones agc(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().toObject();
             // When we remove origv from the wrapper map, its wrapper, newIdentity,
             // must immediately cease to be a cross-compartment wrapper. Neuter it.
             destination->removeWrapper(p);
             NukeCrossCompartmentWrapper(cx, newIdentity);
             if (!JSObject::swap(cx, newIdentity, target))
                 MOZ_CRASH();
         } else {
             // Otherwise, we use |target| for the new identity object.
             newIdentity = target;
         }
         // Now, iterate through other scopes looking for references to the
         // old object, and update the relevant cross-compartment wrappers.
         if (!RemapAllWrappersForObject(cx, origobj, newIdentity))
             MOZ_CRASH();
         // Lastly, update the original object to point to the new one.
         if (origobj->compartment() != destination) {
             RootedObject newIdentityWrapper(cx, newIdentity);
             AutoCompartment ac(cx, origobj);
             if (!JS_WrapObject(cx, &newIdentityWrapper))
                 MOZ_CRASH();
             JS_ASSERT(Wrapper::wrappedObject(newIdentityWrapper) == newIdentity);
             if (!JSObject::swap(cx, origobj, newIdentityWrapper))
                 MOZ_CRASH();
         origobj->compartment()->putWrapper(cx, ObjectValue(*newIdentity), origv);
         }
     }
     // The new identity object might be one of several things. Return it to avoid
     // ambiguity.
     return newIdentity;
 }
 /*
  * Recompute all cross-compartment wrappers for an object, resetting state.
  * Gecko uses this to clear Xray wrappers when doing a navigation that reuses
  * the inner window and global object.
  */
 JS_PUBLIC_API(bool)
 JS_RefreshCrossCompartmentWrappers(JSContext *cx, HandleObject obj)
 {
     return RemapAllWrappersForObject(cx, obj, obj);
 }
 JS_PUBLIC_API(bool)
 JS_InitStandardClasses(JSContext *cx, HandleObject obj)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     cx->setDefaultCompartmentObjectIfUnset(obj);
     assertSameCompartment(cx, obj);
     Rooted<GlobalObject*> global(cx, &obj->global());
     return GlobalObject::initStandardClasses(cx, global);
 }
 #define CLASP(name)                 (&name##Class)
 #define OCLASP(name)                (&name##Object::class_)
 #define TYPED_ARRAY_CLASP(type)     (&TypedArrayObject::classes[ScalarTypeDescr::type])
 #define EAGER_ATOM(name)            NAME_OFFSET(name)
 #define EAGER_CLASS_ATOM(name)      NAME_OFFSET(name)
 static js::Class DummyClass;
 static js::Class SentinelClass;
 typedef struct JSStdName {
     size_t      atomOffset;     /* offset of atom pointer in JSAtomState */
     const Class *clasp;
     bool isDummy() const { return clasp == &DummyClass; };
     bool isSentinel() const { return clasp == &SentinelClass; };
 } JSStdName;
 static const JSStdName*
 LookupStdName(JSRuntime *rt, HandleString name, const JSStdName *table)
 {
     MOZ_ASSERT(name->isAtom());
     for (unsigned i = 0; !table[i].isSentinel(); i++) {
         if (table[i].isDummy())
             continue;
         JSAtom *atom = AtomStateOffsetToName(*rt->commonNames, table[i].atomOffset);
         MOZ_ASSERT(atom);
         if (name == atom)
             return &table[i];
     }
     return nullptr;
 }
 /*
  * Table of standard classes, indexed by JSProtoKey. For entries where the
  * JSProtoKey does not correspond to a class with a meaningful constructor, we
  * insert a null entry into the table.
  */
 #define STD_NAME_ENTRY(name, code, init, clasp) { EAGER_CLASS_ATOM(name), clasp },
 #define STD_DUMMY_ENTRY(name, code, init, dummy) { 0, &DummyClass },
 static const JSStdName standard_class_names[] = {
   JS_FOR_PROTOTYPES(STD_NAME_ENTRY, STD_DUMMY_ENTRY)
   { 0, &SentinelClass }
 };
 /*
  * Table of top-level function and constant names and the init function of the
  * corresponding standard class that sets them up.
  */
 static const JSStdName builtin_property_names[] = {
     { EAGER_ATOM(eval), &JSObject::class_ },
     /* Global properties and functions defined by the Number class. */
     { EAGER_ATOM(NaN), OCLASP(Number) },
     { EAGER_ATOM(Infinity), OCLASP(Number) },
     { EAGER_ATOM(isNaN), OCLASP(Number) },
     { EAGER_ATOM(isFinite), OCLASP(Number) },
     { EAGER_ATOM(parseFloat), OCLASP(Number) },
     { EAGER_ATOM(parseInt), OCLASP(Number) },
     /* String global functions. */
     { EAGER_ATOM(escape), OCLASP(String) },
     { EAGER_ATOM(unescape), OCLASP(String) },
     { EAGER_ATOM(decodeURI), OCLASP(String) },
     { EAGER_ATOM(encodeURI), OCLASP(String) },
     { EAGER_ATOM(decodeURIComponent), OCLASP(String) },
     { EAGER_ATOM(encodeURIComponent), OCLASP(String) },
 #if JS_HAS_UNEVAL
     { EAGER_ATOM(uneval), OCLASP(String) },
 #endif
 #ifdef ENABLE_BINARYDATA
     { EAGER_ATOM(SIMD), OCLASP(SIMD) },
     { EAGER_ATOM(TypedObject), OCLASP(TypedObjectModule) },
 #endif
     { 0, &SentinelClass }
 };
 #undef CLASP
 #undef TYPED_ARRAY_CLASP
 #undef EAGER_ATOM
 #undef EAGER_CLASS_ATOM
 #undef EAGER_ATOM_CLASP
 JS_PUBLIC_API(bool)
 JS_ResolveStandardClass(JSContext *cx, HandleObject obj, HandleId id, bool *resolved)
 {
     JSRuntime *rt;
     const JSStdName *stdnm;
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, id);
     Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
     *resolved = false;
     rt = cx->runtime();
     if (!rt->hasContexts() || !JSID_IS_ATOM(id))
         return true;
     RootedString idstr(cx, JSID_TO_STRING(id));
     /* Check whether we're resolving 'undefined', and define it if so. */
     JSAtom *undefinedAtom = cx->names().undefined;
     if (idstr == undefinedAtom) {
         *resolved = true;
         return JSObject::defineProperty(cx, obj, undefinedAtom->asPropertyName(),
                                         UndefinedHandleValue,
                                         JS_PropertyStub, JS_StrictPropertyStub,
                                         JSPROP_PERMANENT | JSPROP_READONLY);
     }
     /* Try for class constructors/prototypes named by well-known atoms. */
     stdnm = LookupStdName(rt, idstr, standard_class_names);
     /* Try less frequently used top-level functions and constants. */
     if (!stdnm)
         stdnm = LookupStdName(rt, idstr, builtin_property_names);
     // If this class is anonymous, then it doesn't exist as a global
     // property, so we won't resolve anything.
     if (stdnm && !(stdnm->clasp->flags & JSCLASS_IS_ANONYMOUS)) {
         JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(stdnm->clasp);
         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_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);
 }
 JS_PUBLIC_API(JSProtoKey)
 JS_IdToProtoKey(JSContext *cx, HandleId id)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (!JSID_IS_ATOM(id))
         return JSProto_Null;
     RootedString idstr(cx, JSID_TO_STRING(id));
     const JSStdName *stdnm = LookupStdName(cx->runtime(), idstr, standard_class_names);
     if (!stdnm)
         return JSProto_Null;
     MOZ_ASSERT(MOZ_ARRAY_LENGTH(standard_class_names) == JSProto_LIMIT + 1);
     return static_cast<JSProtoKey>(stdnm - standard_class_names);
 }
 JS_PUBLIC_API(JSObject *)
 JS_GetObjectPrototype(JSContext *cx, HandleObject forObj)
 {
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, forObj);
     return forObj->global().getOrCreateObjectPrototype(cx);
 }
 JS_PUBLIC_API(JSObject *)
 JS_GetFunctionPrototype(JSContext *cx, HandleObject forObj)
 {
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, forObj);
     return forObj->global().getOrCreateFunctionPrototype(cx);
 }
 JS_PUBLIC_API(JSObject *)
 JS_GetArrayPrototype(JSContext *cx, HandleObject forObj)
 {
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, forObj);
     Rooted<GlobalObject*> global(cx, &forObj->global());
     return GlobalObject::getOrCreateArrayPrototype(cx, global);
 }
 JS_PUBLIC_API(JSObject *)
 JS_GetGlobalForObject(JSContext *cx, JSObject *obj)
 {
     AssertHeapIsIdle(cx);
     assertSameCompartment(cx, obj);
     return &obj->global();
 }
 extern JS_PUBLIC_API(bool)
 JS_IsGlobalObject(JSObject *obj)
 {
     return obj->is<GlobalObject>();
 }
 JS_PUBLIC_API(JSObject *)
 JS_GetGlobalForCompartmentOrNull(JSContext *cx, JSCompartment *c)
 {
     AssertHeapIsIdleOrIterating(cx);
     assertSameCompartment(cx, c);
     return c->maybeGlobal();
 }
 JS_PUBLIC_API(JSObject *)
 JS::CurrentGlobalOrNull(JSContext *cx)
 {
     AssertHeapIsIdleOrIterating(cx);
     CHECK_REQUEST(cx);
     if (!cx->compartment())
         return nullptr;
     return cx->global();
 }
 JS_PUBLIC_API(jsval)
 JS_ComputeThis(JSContext *cx, jsval *vp)
 {
     AssertHeapIsIdle(cx);
     assertSameCompartment(cx, JSValueArray(vp, 2));
     CallReceiver call = CallReceiverFromVp(vp);
     if (!BoxNonStrictThis(cx, call))
         return JSVAL_NULL;
     return call.thisv();
 }
 JS_PUBLIC_API(void *)
 JS_malloc(JSContext *cx, size_t nbytes)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return cx->malloc_(nbytes);
 }
 JS_PUBLIC_API(void *)
 JS_realloc(JSContext *cx, void *p, size_t nbytes)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return cx->realloc_(p, nbytes);
 }
 JS_PUBLIC_API(void)
 JS_free(JSContext *cx, void *p)
 {
     return js_free(p);
 }
 JS_PUBLIC_API(void)
 JS_freeop(JSFreeOp *fop, void *p)
 {
     return FreeOp::get(fop)->free_(p);
 }
 JS_PUBLIC_API(JSFreeOp *)
 JS_GetDefaultFreeOp(JSRuntime *rt)
 {
     return rt->defaultFreeOp();
 }
 JS_PUBLIC_API(void)
 JS_updateMallocCounter(JSContext *cx, size_t nbytes)
 {
     return cx->runtime()->updateMallocCounter(cx->zone(), nbytes);
 }
 JS_PUBLIC_API(char *)
 JS_strdup(JSContext *cx, const char *s)
 {
     AssertHeapIsIdle(cx);
     return js_strdup(cx, s);
 }
 JS_PUBLIC_API(char *)
 JS_strdup(JSRuntime *rt, const char *s)
 {
     AssertHeapIsIdle(rt);
     size_t n = strlen(s) + 1;
     void *p = rt->malloc_(n);
     if (!p)
         return nullptr;
     return static_cast<char*>(js_memcpy(p, s, n));
 }
 #undef JS_AddRoot
 JS_PUBLIC_API(bool)
 JS::AddValueRoot(JSContext *cx, JS::Heap<JS::Value> *vp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return AddValueRoot(cx, vp->unsafeGet(), nullptr);
 }
 JS_PUBLIC_API(bool)
 JS::AddStringRoot(JSContext *cx, JS::Heap<JSString *> *rp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return AddStringRoot(cx, rp->unsafeGet(), nullptr);
 }
 JS_PUBLIC_API(bool)
 JS::AddObjectRoot(JSContext *cx, JS::Heap<JSObject *> *rp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return AddObjectRoot(cx, rp->unsafeGet(), nullptr);
 }
 JS_PUBLIC_API(bool)
 JS::AddNamedValueRoot(JSContext *cx, JS::Heap<JS::Value> *vp, const char *name)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return AddValueRoot(cx, vp->unsafeGet(), name);
 }
 JS_PUBLIC_API(bool)
 JS::AddNamedValueRootRT(JSRuntime *rt, JS::Heap<JS::Value> *vp, const char *name)
 {
     return AddValueRootRT(rt, vp->unsafeGet(), name);
 }
 JS_PUBLIC_API(bool)
 JS::AddNamedStringRoot(JSContext *cx, JS::Heap<JSString *> *rp, const char *name)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return AddStringRoot(cx, rp->unsafeGet(), name);
 }
 JS_PUBLIC_API(bool)
 JS::AddNamedObjectRoot(JSContext *cx, JS::Heap<JSObject *> *rp, const char *name)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return AddObjectRoot(cx, rp->unsafeGet(), name);
 }
 JS_PUBLIC_API(bool)
 JS::AddNamedScriptRoot(JSContext *cx, JS::Heap<JSScript *> *rp, const char *name)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return AddScriptRoot(cx, rp->unsafeGet(), name);
 }
 /* We allow unrooting from finalizers within the GC */
 JS_PUBLIC_API(void)
 JS::RemoveValueRoot(JSContext *cx, JS::Heap<JS::Value> *vp)
 {
     CHECK_REQUEST(cx);
     RemoveRoot(cx->runtime(), (void *)vp);
     *vp = UndefinedValue();
 }
 JS_PUBLIC_API(void)
 JS::RemoveStringRoot(JSContext *cx, JS::Heap<JSString *> *rp)
 {
     CHECK_REQUEST(cx);
     RemoveRoot(cx->runtime(), (void *)rp);
     *rp = nullptr;
 }
 JS_PUBLIC_API(void)
 JS::RemoveObjectRoot(JSContext *cx, JS::Heap<JSObject *> *rp)
 {
     CHECK_REQUEST(cx);
     RemoveRoot(cx->runtime(), (void *)rp);
     *rp = nullptr;
 }
 JS_PUBLIC_API(void)
 JS::RemoveScriptRoot(JSContext *cx, JS::Heap<JSScript *> *rp)
 {
     CHECK_REQUEST(cx);
     RemoveRoot(cx->runtime(), (void *)rp);
     *rp = nullptr;
 }
 JS_PUBLIC_API(void)
 JS::RemoveValueRootRT(JSRuntime *rt, JS::Heap<JS::Value> *vp)
 {
     RemoveRoot(rt, (void *)vp);
     *vp = UndefinedValue();
 }
 JS_PUBLIC_API(void)
 JS::RemoveStringRootRT(JSRuntime *rt, JS::Heap<JSString *> *rp)
 {
     RemoveRoot(rt, (void *)rp);
     *rp = nullptr;
 }
 JS_PUBLIC_API(void)
 JS::RemoveObjectRootRT(JSRuntime *rt, JS::Heap<JSObject *> *rp)
 {
     RemoveRoot(rt, (void *)rp);
     *rp = nullptr;
 }
 JS_PUBLIC_API(void)
 JS::RemoveScriptRootRT(JSRuntime *rt, JS::Heap<JSScript *> *rp)
 {
     RemoveRoot(rt, (void *)rp);
     *rp = nullptr;
 }
 JS_PUBLIC_API(bool)
 JS_AddExtraGCRootsTracer(JSRuntime *rt, JSTraceDataOp traceOp, void *data)
 {
     AssertHeapIsIdle(rt);
     return !!rt->gcBlackRootTracers.append(JSRuntime::ExtraTracer(traceOp, data));
 }
 JS_PUBLIC_API(void)
 JS_RemoveExtraGCRootsTracer(JSRuntime *rt, JSTraceDataOp traceOp, void *data)
 {
     AssertHeapIsIdle(rt);
     for (size_t i = 0; i < rt->gcBlackRootTracers.length(); i++) {
         JSRuntime::ExtraTracer *e = &rt->gcBlackRootTracers[i];
         if (e->op == traceOp && e->data == data) {
             rt->gcBlackRootTracers.erase(e);
             break;
         }
     }
 }
 #ifdef DEBUG
 typedef struct JSHeapDumpNode JSHeapDumpNode;
 struct JSHeapDumpNode {
     void            *thing;
     JSGCTraceKind   kind;
     JSHeapDumpNode  *next;          /* next sibling */
     JSHeapDumpNode  *parent;        /* node with the thing that refer to thing
                                        from this node */
     char            edgeName[1];    /* name of the edge from parent->thing
                                        into thing */
 };
 typedef HashSet<void *, PointerHasher<void *, 3>, SystemAllocPolicy> VisitedSet;
 class DumpingTracer
 {
   public:
     DumpingTracer(JSRuntime *rt, JSTraceCallback callback)
       : base(rt, callback)
     {}
     JSTracer            base;
     VisitedSet          visited;
     bool                ok;
     void                *startThing;
     void                *thingToFind;
     void                *thingToIgnore;
     JSHeapDumpNode      *parentNode;
     JSHeapDumpNode      **lastNodep;
     char                buffer[200];
 };
 static void
 DumpNotify(JSTracer *trc, void **thingp, JSGCTraceKind kind)
 {
     JS_ASSERT(trc->callback == DumpNotify);
     DumpingTracer *dtrc = (DumpingTracer *)trc;
     void *thing = *thingp;
     if (!dtrc->ok || thing == dtrc->thingToIgnore)
         return;
     /*
      * Check if we have already seen thing unless it is thingToFind to include
      * it to the graph each time we reach it and print all live things that
      * refer to thingToFind.
      *
      * This does not print all possible paths leading to thingToFind since
      * when a thing A refers directly or indirectly to thingToFind and A is
      * present several times in the graph, we will print only the first path
      * leading to A and thingToFind, other ways to reach A will be ignored.
      */
     if (dtrc->thingToFind != thing) {
         /*
          * The startThing check allows to avoid putting startThing into the
          * hash table before tracing startThing in JS_DumpHeap.
          */
         if (thing == dtrc->startThing)
             return;
         VisitedSet::AddPtr p = dtrc->visited.lookupForAdd(thing);
         if (p)
             return;
         if (!dtrc->visited.add(p, thing)) {
             dtrc->ok = false;
             return;
         }
     }
     const char *edgeName = dtrc->base.getTracingEdgeName(dtrc->buffer, sizeof(dtrc->buffer));
     size_t edgeNameSize = strlen(edgeName) + 1;
     size_t bytes = offsetof(JSHeapDumpNode, edgeName) + edgeNameSize;
     JSHeapDumpNode *node = (JSHeapDumpNode *) js_malloc(bytes);
     if (!node) {
         dtrc->ok = false;
         return;
     }
     node->thing = thing;
     node->kind = kind;
     node->next = nullptr;
     node->parent = dtrc->parentNode;
     js_memcpy(node->edgeName, edgeName, edgeNameSize);
     JS_ASSERT(!*dtrc->lastNodep);
     *dtrc->lastNodep = node;
     dtrc->lastNodep = &node->next;
 }
 /* Dump node and the chain that leads to thing it contains. */
 static bool
 DumpNode(DumpingTracer *dtrc, FILE* fp, JSHeapDumpNode *node)
 {
     JSHeapDumpNode *prev, *following;
     size_t chainLimit;
     enum { MAX_PARENTS_TO_PRINT = 10 };
     JS_GetTraceThingInfo(dtrc->buffer, sizeof dtrc->buffer,
                          &dtrc->base, node->thing, node->kind, true);
     if (fprintf(fp, "%p %-22s via ", node->thing, dtrc->buffer) < 0)
         return false;
     /*
      * We need to print the parent chain in the reverse order. To do it in
      * O(N) time where N is the chain length we first reverse the chain while
      * searching for the top and then print each node while restoring the
      * chain order.
      */
     chainLimit = MAX_PARENTS_TO_PRINT;
     prev = nullptr;
     for (;;) {
         following = node->parent;
         node->parent = prev;
         prev = node;
         node = following;
         if (!node)
             break;
         if (chainLimit == 0) {
             if (fputs("...", fp) < 0)
                 return false;
             break;
         }
         --chainLimit;
     }
     node = prev;
     prev = following;
     bool ok = true;
     do {
         /* Loop must continue even when !ok to restore the parent chain. */
         if (ok) {
             if (!prev) {
                 /* Print edge from some runtime root or startThing. */
                 if (fputs(node->edgeName, fp) < 0)
                     ok = false;
             } else {
                 JS_GetTraceThingInfo(dtrc->buffer, sizeof dtrc->buffer,
                                      &dtrc->base, prev->thing, prev->kind,
                                      false);
                 if (fprintf(fp, "(%p %s).%s",
                            prev->thing, dtrc->buffer, node->edgeName) < 0) {
                     ok = false;
                 }
             }
         }
         following = node->parent;
         node->parent = prev;
         prev = node;
         node = following;
     } while (node);
     return ok && putc('\n', fp) >= 0;
 }
 JS_PUBLIC_API(bool)
 JS_DumpHeap(JSRuntime *rt, FILE *fp, void* startThing, JSGCTraceKind startKind,
             void *thingToFind, size_t maxDepth, void *thingToIgnore)
 {
     if (maxDepth == 0)
         return true;
     DumpingTracer dtrc(rt, DumpNotify);
     if (!dtrc.visited.init())
         return false;
     dtrc.ok = true;
     dtrc.startThing = startThing;
     dtrc.thingToFind = thingToFind;
     dtrc.thingToIgnore = thingToIgnore;
     dtrc.parentNode = nullptr;
     JSHeapDumpNode *node = nullptr;
     dtrc.lastNodep = &node;
     if (!startThing) {
         JS_ASSERT(startKind == JSTRACE_OBJECT);
         TraceRuntime(&dtrc.base);
     } else {
         JS_TraceChildren(&dtrc.base, startThing, startKind);
     }
     if (!node)
         return dtrc.ok;
     size_t depth = 1;
     JSHeapDumpNode *children, *next, *parent;
     bool thingToFindWasTraced = thingToFind && thingToFind == startThing;
     for (;;) {
         /*
          * Loop must continue even when !dtrc.ok to free all nodes allocated
          * so far.
          */
         if (dtrc.ok) {
             if (thingToFind == nullptr || thingToFind == node->thing)
                 dtrc.ok = DumpNode(&dtrc, fp, node);
             /* Descend into children. */
             if (dtrc.ok &&
                 depth < maxDepth &&
                 (thingToFind != node->thing || !thingToFindWasTraced)) {
                 dtrc.parentNode = node;
                 children = nullptr;
                 dtrc.lastNodep = &children;
                 JS_TraceChildren(&dtrc.base, node->thing, node->kind);
                 if (thingToFind == node->thing)
                     thingToFindWasTraced = true;
                 if (children != nullptr) {
                     ++depth;
                     node = children;
                     continue;
                 }
             }
         }
         /* Move to next or parents next and free the node. */
         for (;;) {
             next = node->next;
             parent = node->parent;
             js_free(node);
             node = next;
             if (node)
                 break;
             if (!parent)
                 return dtrc.ok;
             JS_ASSERT(depth > 1);
             --depth;
             node = parent;
         }
     }
     JS_ASSERT(depth == 1);
     return dtrc.ok;
 }
 #endif /* DEBUG */
 extern JS_PUBLIC_API(bool)
 JS_IsGCMarkingTracer(JSTracer *trc)
 {
     return IS_GC_MARKING_TRACER(trc);
 }
 #ifdef DEBUG
 extern JS_PUBLIC_API(bool)
 JS_IsMarkingGray(JSTracer *trc)
 {
     JS_ASSERT(JS_IsGCMarkingTracer(trc));
     return trc->callback == GCMarker::GrayCallback;
 }
 #endif
 JS_PUBLIC_API(void)
 JS_GC(JSRuntime *rt)
 {
     AssertHeapIsIdle(rt);
     JS::PrepareForFullGC(rt);
     GC(rt, GC_NORMAL, JS::gcreason::API);
 }
 JS_PUBLIC_API(void)
 JS_MaybeGC(JSContext *cx)
 {
     MaybeGC(cx);
 }
 JS_PUBLIC_API(void)
 JS_SetGCCallback(JSRuntime *rt, JSGCCallback cb, void *data)
 {
     AssertHeapIsIdle(rt);
     rt->gcCallback = cb;
     rt->gcCallbackData = data;
 }
 JS_PUBLIC_API(void)
 JS_SetFinalizeCallback(JSRuntime *rt, JSFinalizeCallback cb)
 {
     AssertHeapIsIdle(rt);
     rt->gcFinalizeCallback = cb;
 }
 JS_PUBLIC_API(bool)
 JS_IsAboutToBeFinalized(JS::Heap<JSObject *> *objp)
 {
     return IsObjectAboutToBeFinalized(objp->unsafeGet());
 }
 JS_PUBLIC_API(bool)
 JS_IsAboutToBeFinalizedUnbarriered(JSObject **objp)
 {
     return IsObjectAboutToBeFinalized(objp);
 }
 JS_PUBLIC_API(void)
 JS_SetGCParameter(JSRuntime *rt, JSGCParamKey key, uint32_t value)
 {
     switch (key) {
       case JSGC_MAX_BYTES: {
         JS_ASSERT(value >= rt->gcBytes);
         rt->gcMaxBytes = value;
         break;
       }
       case JSGC_MAX_MALLOC_BYTES:
         rt->setGCMaxMallocBytes(value);
         break;
       case JSGC_SLICE_TIME_BUDGET:
         rt->gcSliceBudget = SliceBudget::TimeBudget(value);
         break;
       case JSGC_MARK_STACK_LIMIT:
         js::SetMarkStackLimit(rt, value);
         break;
       case JSGC_HIGH_FREQUENCY_TIME_LIMIT:
         rt->gcHighFrequencyTimeThreshold = value;
         break;
       case JSGC_HIGH_FREQUENCY_LOW_LIMIT:
         rt->gcHighFrequencyLowLimitBytes = value * 1024 * 1024;
         break;
       case JSGC_HIGH_FREQUENCY_HIGH_LIMIT:
         rt->gcHighFrequencyHighLimitBytes = value * 1024 * 1024;
         break;
       case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX:
         rt->gcHighFrequencyHeapGrowthMax = value / 100.0;
         MOZ_ASSERT(rt->gcHighFrequencyHeapGrowthMax / 0.85 > 1.0);
         break;
       case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN:
         rt->gcHighFrequencyHeapGrowthMin = value / 100.0;
         MOZ_ASSERT(rt->gcHighFrequencyHeapGrowthMin / 0.85 > 1.0);
         break;
       case JSGC_LOW_FREQUENCY_HEAP_GROWTH:
         rt->gcLowFrequencyHeapGrowth = value / 100.0;
         MOZ_ASSERT(rt->gcLowFrequencyHeapGrowth / 0.9 > 1.0);
         break;
       case JSGC_DYNAMIC_HEAP_GROWTH:
         rt->gcDynamicHeapGrowth = value;
         break;
       case JSGC_DYNAMIC_MARK_SLICE:
         rt->gcDynamicMarkSlice = value;
         break;
       case JSGC_ALLOCATION_THRESHOLD:
         rt->gcAllocationThreshold = value * 1024 * 1024;
         break;
       case JSGC_DECOMMIT_THRESHOLD:
         rt->gcDecommitThreshold = value * 1024 * 1024;
         break;
       default:
         JS_ASSERT(key == JSGC_MODE);
         rt->setGCMode(JSGCMode(value));
         JS_ASSERT(rt->gcMode() == JSGC_MODE_GLOBAL ||
                   rt->gcMode() == JSGC_MODE_COMPARTMENT ||
                   rt->gcMode() == JSGC_MODE_INCREMENTAL);
         return;
     }
 }
 JS_PUBLIC_API(uint32_t)
 JS_GetGCParameter(JSRuntime *rt, JSGCParamKey key)
 {
     switch (key) {
       case JSGC_MAX_BYTES:
         return uint32_t(rt->gcMaxBytes);
       case JSGC_MAX_MALLOC_BYTES:
         return rt->gcMaxMallocBytes;
       case JSGC_BYTES:
         return uint32_t(rt->gcBytes);
       case JSGC_MODE:
         return uint32_t(rt->gcMode());
       case JSGC_UNUSED_CHUNKS:
         return uint32_t(rt->gcChunkPool.getEmptyCount());
       case JSGC_TOTAL_CHUNKS:
         return uint32_t(rt->gcChunkSet.count() + rt->gcChunkPool.getEmptyCount());
       case JSGC_SLICE_TIME_BUDGET:
         return uint32_t(rt->gcSliceBudget > 0 ? rt->gcSliceBudget / PRMJ_USEC_PER_MSEC : 0);
       case JSGC_MARK_STACK_LIMIT:
         return rt->gcMarker.maxCapacity();
       case JSGC_HIGH_FREQUENCY_TIME_LIMIT:
         return rt->gcHighFrequencyTimeThreshold;
       case JSGC_HIGH_FREQUENCY_LOW_LIMIT:
         return rt->gcHighFrequencyLowLimitBytes / 1024 / 1024;
       case JSGC_HIGH_FREQUENCY_HIGH_LIMIT:
         return rt->gcHighFrequencyHighLimitBytes / 1024 / 1024;
       case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX:
         return uint32_t(rt->gcHighFrequencyHeapGrowthMax * 100);
       case JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN:
         return uint32_t(rt->gcHighFrequencyHeapGrowthMin * 100);
       case JSGC_LOW_FREQUENCY_HEAP_GROWTH:
         return uint32_t(rt->gcLowFrequencyHeapGrowth * 100);
       case JSGC_DYNAMIC_HEAP_GROWTH:
         return rt->gcDynamicHeapGrowth;
       case JSGC_DYNAMIC_MARK_SLICE:
         return rt->gcDynamicMarkSlice;
       case JSGC_ALLOCATION_THRESHOLD:
         return rt->gcAllocationThreshold / 1024 / 1024;
       default:
         JS_ASSERT(key == JSGC_NUMBER);
         return uint32_t(rt->gcNumber);
     }
 }
 JS_PUBLIC_API(void)
 JS_SetGCParameterForThread(JSContext *cx, JSGCParamKey key, uint32_t value)
 {
     JS_ASSERT(key == JSGC_MAX_CODE_CACHE_BYTES);
 }
 JS_PUBLIC_API(uint32_t)
 JS_GetGCParameterForThread(JSContext *cx, JSGCParamKey key)
 {
     JS_ASSERT(key == JSGC_MAX_CODE_CACHE_BYTES);
     return 0;
 }
 static const size_t NumGCConfigs = 14;
 struct JSGCConfig {
     JSGCParamKey key;
     uint32_t value;
 };
 JS_PUBLIC_API(void)
 JS_SetGCParametersBasedOnAvailableMemory(JSRuntime *rt, uint32_t availMem)
 {
     static const JSGCConfig minimal[NumGCConfigs] = {
         {JSGC_MAX_MALLOC_BYTES, 6 * 1024 * 1024},
         {JSGC_SLICE_TIME_BUDGET, 30},
         {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
         {JSGC_HIGH_FREQUENCY_HIGH_LIMIT, 40},
         {JSGC_HIGH_FREQUENCY_LOW_LIMIT, 0},
         {JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX, 300},
         {JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN, 120},
         {JSGC_LOW_FREQUENCY_HEAP_GROWTH, 120},
         {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
         {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
         {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
         {JSGC_ALLOCATION_THRESHOLD, 1},
         {JSGC_DECOMMIT_THRESHOLD, 1},
         {JSGC_MODE, JSGC_MODE_INCREMENTAL}
     };
     const JSGCConfig *config = minimal;
     if (availMem > 512) {
         static const JSGCConfig nominal[NumGCConfigs] = {
             {JSGC_MAX_MALLOC_BYTES, 6 * 1024 * 1024},
             {JSGC_SLICE_TIME_BUDGET, 30},
             {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1000},
             {JSGC_HIGH_FREQUENCY_HIGH_LIMIT, 500},
             {JSGC_HIGH_FREQUENCY_LOW_LIMIT, 100},
             {JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MAX, 300},
             {JSGC_HIGH_FREQUENCY_HEAP_GROWTH_MIN, 150},
             {JSGC_LOW_FREQUENCY_HEAP_GROWTH, 150},
             {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
             {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
             {JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
             {JSGC_ALLOCATION_THRESHOLD, 30},
             {JSGC_DECOMMIT_THRESHOLD, 32},
             {JSGC_MODE, JSGC_MODE_COMPARTMENT}
         };
         config = nominal;
     }
     for (size_t i = 0; i < NumGCConfigs; i++)
         JS_SetGCParameter(rt, config[i].key, config[i].value);
 }
 JS_PUBLIC_API(JSString *)
 JS_NewExternalString(JSContext *cx, const jschar *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
 SetNativeStackQuota(JSRuntime *rt, StackKind kind, size_t stackSize)
 {
     rt->nativeStackQuota[kind] = stackSize;
     if (rt->nativeStackBase)
         RecomputeStackLimit(rt, kind);
 }
 void
 js::RecomputeStackLimit(JSRuntime *rt, StackKind kind)
 {
     size_t stackSize = rt->nativeStackQuota[kind];
 #if JS_STACK_GROWTH_DIRECTION > 0
     if (stackSize == 0) {
         rt->mainThread.nativeStackLimit[kind] = UINTPTR_MAX;
     } else {
         JS_ASSERT(rt->nativeStackBase <= size_t(-1) - stackSize);
         rt->mainThread.nativeStackLimit[kind] =
           rt->nativeStackBase + stackSize - 1;
     }
 #else
     if (stackSize == 0) {
         rt->mainThread.nativeStackLimit[kind] = 0;
     } else {
         JS_ASSERT(rt->nativeStackBase >= stackSize);
         rt->mainThread.nativeStackLimit[kind] =
           rt->nativeStackBase - (stackSize - 1);
     }
 #endif
     // If there's no pending interrupt request set on the runtime's main thread's
     // jitStackLimit, then update it so that it reflects the new nativeStacklimit.
     //
     // Note that, for now, we use the untrusted limit for ion. This is fine,
     // because it's the most conservative limit, and if we hit it, we'll bail
     // out of ion into the interpeter, which will do a proper recursion check.
 #ifdef JS_ION
     if (kind == StackForUntrustedScript) {
         JSRuntime::AutoLockForInterrupt lock(rt);
         if (rt->mainThread.jitStackLimit != uintptr_t(-1)) {
             rt->mainThread.jitStackLimit = rt->mainThread.nativeStackLimit[kind];
 #ifdef JS_ARM_SIMULATOR
             rt->mainThread.jitStackLimit = jit::Simulator::StackLimit();
 #endif
         }
     }
 #endif
 }
 JS_PUBLIC_API(void)
 JS_SetNativeStackQuota(JSRuntime *rt, size_t systemCodeStackSize,
                        size_t trustedScriptStackSize,
                        size_t untrustedScriptStackSize)
 {
     JS_ASSERT_IF(trustedScriptStackSize,
                  trustedScriptStackSize < systemCodeStackSize);
     if (!trustedScriptStackSize)
         trustedScriptStackSize = systemCodeStackSize;
     JS_ASSERT_IF(untrustedScriptStackSize,
                  untrustedScriptStackSize < trustedScriptStackSize);
     if (!untrustedScriptStackSize)
         untrustedScriptStackSize = trustedScriptStackSize;
     SetNativeStackQuota(rt, StackForSystemCode, systemCodeStackSize);
     SetNativeStackQuota(rt, StackForTrustedScript, trustedScriptStackSize);
     SetNativeStackQuota(rt, StackForUntrustedScript, untrustedScriptStackSize);
 }
 /************************************************************************/
 JS_PUBLIC_API(int)
 JS_IdArrayLength(JSContext *cx, JSIdArray *ida)
 {
     return ida->length;
 }
 JS_PUBLIC_API(jsid)
 JS_IdArrayGet(JSContext *cx, JSIdArray *ida, int index)
 {
     JS_ASSERT(index >= 0 && index < ida->length);
     return ida->vector[index];
 }
 JS_PUBLIC_API(void)
 JS_DestroyIdArray(JSContext *cx, JSIdArray *ida)
 {
     cx->runtime()->defaultFreeOp()->free_(ida);
 }
 JS_PUBLIC_API(bool)
 JS_ValueToId(JSContext *cx, HandleValue value, MutableHandleId idp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, value);
     return ValueToId<CanGC>(cx, value, idp);
 }
 JS_PUBLIC_API(bool)
 JS_StringToId(JSContext *cx, HandleString string, MutableHandleId idp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, string);
     RootedValue value(cx, StringValue(string));
     return ValueToId<CanGC>(cx, value, idp);
 }
 JS_PUBLIC_API(bool)
 JS_IdToValue(JSContext *cx, jsid id, MutableHandleValue vp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     vp.set(IdToValue(id));
     assertSameCompartment(cx, vp);
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_DefaultValue(JSContext *cx, HandleObject obj, JSType hint, MutableHandleValue vp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JS_ASSERT(obj != nullptr);
     JS_ASSERT(hint == JSTYPE_VOID || hint == JSTYPE_STRING || hint == JSTYPE_NUMBER);
     return JSObject::defaultValue(cx, obj, hint, vp);
 }
 JS_PUBLIC_API(bool)
 JS_PropertyStub(JSContext *cx, HandleObject obj, HandleId id, MutableHandleValue vp)
 {
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_StrictPropertyStub(JSContext *cx, HandleObject obj, HandleId id, bool strict, MutableHandleValue vp)
 {
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_DeletePropertyStub(JSContext *cx, HandleObject obj, HandleId id, bool *succeeded)
 {
     *succeeded = true;
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_EnumerateStub(JSContext *cx, HandleObject obj)
 {
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_ResolveStub(JSContext *cx, HandleObject obj, HandleId id)
 {
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_ConvertStub(JSContext *cx, HandleObject obj, JSType type, MutableHandleValue vp)
 {
     JS_ASSERT(type != JSTYPE_OBJECT && type != JSTYPE_FUNCTION);
     JS_ASSERT(obj);
     return DefaultValue(cx, obj, type, vp);
 }
 JS_PUBLIC_API(JSObject *)
 JS_InitClass(JSContext *cx, 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 js_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->getPrivate();
 }
 JS_PUBLIC_API(void)
 JS_SetPrivate(JSObject *obj, void *data)
 {
     /* This function can be called by a finalizer. */
     obj->setPrivate(data);
 }
 JS_PUBLIC_API(void *)
 JS_GetInstancePrivate(JSContext *cx, HandleObject obj, const JSClass *clasp, CallArgs *args)
 {
     if (!JS_InstanceOf(cx, obj, clasp, args))
         return nullptr;
     return obj->getPrivate();
 }
 JS_PUBLIC_API(bool)
 JS_GetPrototype(JSContext *cx, JS::Handle<JSObject*> obj, JS::MutableHandle<JSObject*> protop)
 {
     return JSObject::getProto(cx, obj, protop);
 }
 JS_PUBLIC_API(bool)
 JS_SetPrototype(JSContext *cx, JS::Handle<JSObject*> obj, JS::Handle<JSObject*> proto)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, proto);
     bool succeeded;
     if (!JSObject::setProto(cx, obj, proto, &succeeded))
         return false;
     if (!succeeded) {
         RootedValue val(cx, ObjectValue(*obj));
         js_ReportValueError(cx, JSMSG_SETPROTOTYPEOF_FAIL, JSDVG_IGNORE_STACK, val, js::NullPtr());
         return false;
     }
     return true;
 }
 JS_PUBLIC_API(JSObject *)
 JS_GetParent(JSObject *obj)
 {
     JS_ASSERT(!obj->is<ScopeObject>());
     return obj->getParent();
 }
 JS_PUBLIC_API(bool)
 JS_SetParent(JSContext *cx, HandleObject obj, HandleObject parent)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JS_ASSERT(!obj->is<ScopeObject>());
     JS_ASSERT(parent || !obj->getParent());
     assertSameCompartment(cx, obj, parent);
     return JSObject::setParent(cx, obj, parent);
 }
 JS_PUBLIC_API(JSObject *)
 JS_GetConstructor(JSContext *cx, HandleObject proto)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, proto);
     RootedValue cval(cx);
     if (!JSObject::getProperty(cx, proto, proto, cx->names().constructor, &cval))
         return nullptr;
     if (!IsFunctionObject(cval)) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NO_CONSTRUCTOR,
                              proto->getClass()->name);
         return nullptr;
     }
     return &cval.toObject();
 }
 namespace {
 class AutoCompartmentRooter : private JS::CustomAutoRooter
 {
   public:
     explicit AutoCompartmentRooter(JSContext *cx, JSCompartment *comp
                                    MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
       : CustomAutoRooter(cx), compartment(comp)
     {
         MOZ_GUARD_OBJECT_NOTIFIER_INIT;
     }
     operator JSCompartment *() {
         return compartment;
     }
     JSCompartment *operator->() {
         return compartment;
     }
   protected:
     virtual void trace(JSTracer *trc)
     {
         compartment->mark();
     }
   private:
     JSCompartment *compartment;
     MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
 };
 } /* anonymous namespace */
 bool
 JS::CompartmentOptions::cloneSingletons(JSContext *cx) const
 {
     return cloneSingletonsOverride_.get(cx->options().cloneSingletons());
 }
 JS::CompartmentOptions &
 JS::CompartmentOptions::setZone(ZoneSpecifier spec)
 {
     zone_.spec = spec;
     return *this;
 }
 JS::CompartmentOptions &
 JS::CompartmentOptions::setSameZoneAs(JSObject *obj)
 {
     zone_.pointer = static_cast<void *>(obj->zone());
     return *this;
 }
 JS::CompartmentOptions &
 JS::CompartmentOptionsRef(JSCompartment *compartment)
 {
     return compartment->options();
 }
 JS::CompartmentOptions &
 JS::CompartmentOptionsRef(JSObject *obj)
 {
     return obj->compartment()->options();
 }
 JS::CompartmentOptions &
 JS::CompartmentOptionsRef(JSContext *cx)
 {
     return cx->compartment()->options();
 }
 JS_PUBLIC_API(JSObject *)
 JS_NewGlobalObject(JSContext *cx, const JSClass *clasp, JSPrincipals *principals,
                    JS::OnNewGlobalHookOption hookOption,
                    const JS::CompartmentOptions &options /* = JS::CompartmentOptions() */)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     JS_ASSERT(!cx->isExceptionPending());
     JSRuntime *rt = cx->runtime();
     Zone *zone;
     if (options.zoneSpecifier() == JS::SystemZone)
         zone = rt->systemZone;
     else if (options.zoneSpecifier() == JS::FreshZone)
         zone = nullptr;
     else
         zone = static_cast<Zone *>(options.zonePointer());
     AutoCompartmentRooter compartment(cx, NewCompartment(cx, zone, principals, options));
     if (!compartment)
         return nullptr;
     // Lazily create the system zone.
     if (!rt->systemZone && options.zoneSpecifier() == JS::SystemZone) {
         rt->systemZone = compartment->zone();
         rt->systemZone->isSystem = true;
     }
     Rooted<GlobalObject *> global(cx);
     {
         AutoCompartment ac(cx, compartment);
         global = GlobalObject::create(cx, Valueify(clasp));
     }
     if (!global)
         return nullptr;
     if (hookOption == JS::FireOnNewGlobalHook)
         JS_FireOnNewGlobalObject(cx, global);
     return global;
 }
 JS_PUBLIC_API(void)
 JS_GlobalObjectTraceHook(JSTracer *trc, JSObject *global)
 {
     JS_ASSERT(global->is<GlobalObject>());
     // Off thread parsing and compilation tasks create a dummy global which is then
     // merged back into the host compartment. Since it used to be a global, it will still
     // have this trace hook, but it does not have a meaning relative to its new compartment.
     // We can safely skip it.
     if (!global->isOwnGlobal())
         return;
     // Trace the compartment for any GC things that should only stick around if we know the
     // compartment is live.
     global->compartment()->trace(trc);
     JSTraceOp trace = global->compartment()->options().getTrace();
     if (trace)
         trace(trc, global);
 }
 JS_PUBLIC_API(void)
 JS_FireOnNewGlobalObject(JSContext *cx, JS::HandleObject global)
 {
     // This hook is infallible, because we don't really want arbitrary script
     // to be able to throw errors during delicate global creation routines.
     // This infallibility will eat OOM and slow script, but if that happens
     // we'll likely run up into them again soon in a fallible context.
     Rooted<js::GlobalObject*> globalObject(cx, &global->as<GlobalObject>());
     Debugger::onNewGlobalObject(cx, globalObject);
 }
 JS_PUBLIC_API(JSObject *)
 JS_NewObject(JSContext *cx, const JSClass *jsclasp, HandleObject proto, HandleObject parent)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, proto, parent);
     const Class *clasp = Valueify(jsclasp);
     if (!clasp)
         clasp = &JSObject::class_;    /* default class is Object */
     JS_ASSERT(clasp != &JSFunction::class_);
     JS_ASSERT(!(clasp->flags & JSCLASS_IS_GLOBAL));
     JSObject *obj = NewObjectWithClassProto(cx, clasp, proto, parent);
     JS_ASSERT_IF(obj, obj->getParent());
     return obj;
 }
 JS_PUBLIC_API(JSObject *)
 JS_NewObjectWithGivenProto(JSContext *cx, const JSClass *jsclasp, HandleObject proto, HandleObject parent)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, proto, parent);
     const Class *clasp = Valueify(jsclasp);
     if (!clasp)
         clasp = &JSObject::class_;    /* default class is Object */
     JS_ASSERT(clasp != &JSFunction::class_);
     JS_ASSERT(!(clasp->flags & JSCLASS_IS_GLOBAL));
     JSObject *obj = NewObjectWithGivenProto(cx, clasp, proto, parent);
     if (obj)
         MarkTypeObjectUnknownProperties(cx, obj->type());
     return obj;
 }
 JS_PUBLIC_API(JSObject *)
 JS_NewObjectForConstructor(JSContext *cx, 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_IsExtensible(JSContext *cx, HandleObject obj, bool *extensible)
 {
     return JSObject::isExtensible(cx, obj, extensible);
 }
 JS_PUBLIC_API(bool)
 JS_IsNative(JSObject *obj)
 {
     return obj->isNative();
 }
 JS_PUBLIC_API(JSRuntime *)
 JS_GetObjectRuntime(JSObject *obj)
 {
     return obj->compartment()->runtimeFromMainThread();
 }
 JS_PUBLIC_API(bool)
 JS_FreezeObject(JSContext *cx, HandleObject obj)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     return JSObject::freeze(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 (!JSObject::isExtensible(cx, obj, &extensible))
         return false;
     if (!extensible)
         return true;
     if (!JSObject::freeze(cx, obj))
         return false;
     /* Walk slots in obj and if any value is a non-null object, seal it. */
     for (uint32_t i = 0, n = obj->slotSpan(); i < n; ++i) {
         const Value &v = obj->getSlot(i);
         if (v.isPrimitive())
             continue;
         RootedObject obj(cx, &v.toObject());
         if (!JS_DeepFreezeObject(cx, obj))
             return false;
     }
     return true;
 }
 static bool
 LookupPropertyById(JSContext *cx, HandleObject obj, HandleId id,
                    MutableHandleObject objp, MutableHandleShape propp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, id);
     return JSObject::lookupGeneric(cx, obj, id, objp, propp);
 }
 #define AUTO_NAMELEN(s,n)   (((n) == (size_t)-1) ? js_strlen(s) : (n))
 static bool
 LookupResult(JSContext *cx, HandleObject obj, HandleObject obj2, HandleId id,
              HandleShape shape, MutableHandleValue vp)
 {
     if (!shape) {
         /* XXX bad API: no way to tell "not defined" from "void value" */
         vp.setUndefined();
         return true;
     }
     if (!obj2->isNative()) {
         if (obj2->is<ProxyObject>()) {
             Rooted<PropertyDescriptor> desc(cx);
             if (!Proxy::getPropertyDescriptor(cx, obj2, id, &desc))
                 return false;
             if (!desc.isShared()) {
                 vp.set(desc.value());
                 return true;
             }
         }
     } else if (IsImplicitDenseOrTypedArrayElement(shape)) {
         vp.set(obj2->getDenseOrTypedArrayElement(JSID_TO_INT(id)));
         return true;
     } else {
         /* Peek at the native property's slot value, without doing a Get. */
         if (shape->hasSlot()) {
             vp.set(obj2->nativeGetSlot(shape->slot()));
             return true;
         }
     }
     /* XXX bad API: no way to return "defined but value unknown" */
     vp.setBoolean(true);
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_LookupPropertyById(JSContext *cx, HandleObject obj, HandleId id, MutableHandleValue vp)
 {
     RootedObject obj2(cx);
     RootedShape prop(cx);
     return LookupPropertyById(cx, obj, id, &obj2, &prop) &&
            LookupResult(cx, obj, obj2, id, prop, vp);
 }
 JS_PUBLIC_API(bool)
 JS_LookupElement(JSContext *cx, HandleObject obj, uint32_t index, MutableHandleValue vp)
 {
     CHECK_REQUEST(cx);
     RootedId id(cx);
     if (!IndexToId(cx, index, &id))
         return false;
     return JS_LookupPropertyById(cx, obj, id, vp);
 }
 JS_PUBLIC_API(bool)
 JS_LookupProperty(JSContext *cx, HandleObject objArg, const char *name, MutableHandleValue vp)
 {
     RootedObject obj(cx, objArg);
     JSAtom *atom = Atomize(cx, name, strlen(name));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_LookupPropertyById(cx, obj, id, vp);
 }
 JS_PUBLIC_API(bool)
 JS_LookupUCProperty(JSContext *cx, HandleObject objArg, const jschar *name, size_t namelen,
                     MutableHandleValue vp)
 {
     RootedObject obj(cx, objArg);
     JSAtom *atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_LookupPropertyById(cx, obj, id, vp);
 }
 JS_PUBLIC_API(bool)
 JS_HasPropertyById(JSContext *cx, HandleObject obj, HandleId id, bool *foundp)
 {
     RootedObject obj2(cx);
     RootedShape prop(cx);
     bool ok = LookupPropertyById(cx, obj, id, &obj2, &prop);
     *foundp = (prop != nullptr);
     return ok;
 }
 JS_PUBLIC_API(bool)
 JS_HasElement(JSContext *cx, HandleObject obj, uint32_t index, bool *foundp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     RootedId id(cx);
     if (!IndexToId(cx, index, &id))
         return false;
     return JS_HasPropertyById(cx, obj, id, foundp);
 }
 JS_PUBLIC_API(bool)
 JS_HasProperty(JSContext *cx, HandleObject obj, const char *name, bool *foundp)
 {
     JSAtom *atom = Atomize(cx, name, strlen(name));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_HasPropertyById(cx, obj, id, foundp);
 }
 JS_PUBLIC_API(bool)
 JS_HasUCProperty(JSContext *cx, HandleObject obj, const jschar *name, size_t namelen, bool *foundp)
 {
     JSAtom *atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_HasPropertyById(cx, obj, id, foundp);
 }
 JS_PUBLIC_API(bool)
 JS_AlreadyHasOwnPropertyById(JSContext *cx, HandleObject obj, HandleId id, bool *foundp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, id);
     if (!obj->isNative()) {
         RootedObject obj2(cx);
         RootedShape prop(cx);
         if (!LookupPropertyById(cx, obj, id, &obj2, &prop))
             return false;
         *foundp = (obj == obj2);
         return true;
     }
     // Check for an existing native property on the objct. Be careful not to
     // call any lookup or resolve hooks.
     if (JSID_IS_INT(id)) {
         uint32_t index = JSID_TO_INT(id);
         if (obj->containsDenseElement(index)) {
             *foundp = true;
             return true;
         }
         if (obj->is<TypedArrayObject>() && index < obj->as<TypedArrayObject>().length()) {
             *foundp = true;
             return true;
         }
     }
     *foundp = obj->nativeContains(cx, id);
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_AlreadyHasOwnElement(JSContext *cx, HandleObject obj, uint32_t index, bool *foundp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     RootedId id(cx);
     if (!IndexToId(cx, index, &id))
         return false;
     return JS_AlreadyHasOwnPropertyById(cx, obj, id, foundp);
 }
 JS_PUBLIC_API(bool)
 JS_AlreadyHasOwnProperty(JSContext *cx, HandleObject obj, const char *name, bool *foundp)
 {
     JSAtom *atom = Atomize(cx, name, strlen(name));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_AlreadyHasOwnPropertyById(cx, obj, id, foundp);
 }
 JS_PUBLIC_API(bool)
 JS_AlreadyHasOwnUCProperty(JSContext *cx, HandleObject obj, const jschar *name, size_t namelen,
                            bool *foundp)
 {
     JSAtom *atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_AlreadyHasOwnPropertyById(cx, obj, id, foundp);
 }
 /* Wrapper functions to create wrappers with no corresponding JSJitInfo from API
  * function arguments.
  */
 static JSPropertyOpWrapper
 GetterWrapper(JSPropertyOp getter)
 {
     JSPropertyOpWrapper ret;
     ret.op = getter;
     ret.info = nullptr;
     return ret;
 }
 static JSStrictPropertyOpWrapper
 SetterWrapper(JSStrictPropertyOp setter)
 {
     JSStrictPropertyOpWrapper ret;
     ret.op = setter;
     ret.info = nullptr;
     return ret;
 }
 static bool
 DefinePropertyById(JSContext *cx, HandleObject obj, HandleId id, HandleValue value,
                    const JSPropertyOpWrapper &get, const JSStrictPropertyOpWrapper &set,
                    unsigned attrs, unsigned flags)
 {
     PropertyOp getter = get.op;
     StrictPropertyOp setter = set.op;
     /*
      * JSPROP_READONLY has no meaning when accessors are involved. Ideally we'd
      * throw if this happens, but we've accepted it for long enough that it's
      * not worth trying to make callers change their ways. Just flip it off on
      * its way through the API layer so that we can enforce this internally.
      */
     if (attrs & (JSPROP_GETTER | JSPROP_SETTER))
         attrs &= ~JSPROP_READONLY;
     /*
      * When we use DefineProperty, we need full scriptable Function objects rather
      * than JSNatives. However, we might be pulling this property descriptor off
      * of something with JSNative property descriptors. If we are, wrap them in
      * JS Function objects.
      */
     if (attrs & JSPROP_NATIVE_ACCESSORS) {
         JS_ASSERT(!(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
         JSFunction::Flags zeroFlags = JSAPIToJSFunctionFlags(0);
         // We can't just use JS_NewFunctionById here because it
         // assumes a string id.
         RootedAtom atom(cx, JSID_IS_ATOM(id) ? JSID_TO_ATOM(id) : nullptr);
         attrs &= ~JSPROP_NATIVE_ACCESSORS;
         if (getter) {
             RootedObject global(cx, (JSObject*) &obj->global());
             JSFunction *getobj = NewFunction(cx, NullPtr(), (Native) getter, 0,
                                              zeroFlags, global, atom);
             if (!getobj)
                 return false;
             if (get.info)
                 getobj->setJitInfo(get.info);
             getter = JS_DATA_TO_FUNC_PTR(PropertyOp, getobj);
             attrs |= JSPROP_GETTER;
         }
         if (setter) {
             // Root just the getter, since the setter is not yet a JSObject.
             AutoRooterGetterSetter getRoot(cx, JSPROP_GETTER, &getter, nullptr);
             RootedObject global(cx, (JSObject*) &obj->global());
             JSFunction *setobj = NewFunction(cx, NullPtr(), (Native) setter, 1,
                                              zeroFlags, global, atom);
             if (!setobj)
                 return false;
             if (set.info)
                 setobj->setJitInfo(set.info);
             setter = JS_DATA_TO_FUNC_PTR(StrictPropertyOp, setobj);
             attrs |= JSPROP_SETTER;
         }
     }
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, id, value,
                             (attrs & JSPROP_GETTER)
                             ? JS_FUNC_TO_DATA_PTR(JSObject *, getter)
                             : nullptr,
                             (attrs & JSPROP_SETTER)
                             ? JS_FUNC_TO_DATA_PTR(JSObject *, setter)
                             : nullptr);
     return JSObject::defineGeneric(cx, obj, id, value, getter, setter, attrs);
 }
 JS_PUBLIC_API(bool)
 JS_DefinePropertyById(JSContext *cx, JSObject *objArg, jsid idArg, jsval valueArg,
                       JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs)
 {
     RootedObject obj(cx, objArg);
     RootedId id(cx, idArg);
     RootedValue value(cx, valueArg);
     return DefinePropertyById(cx, obj, id, value, GetterWrapper(getter), SetterWrapper(setter),
                               attrs, 0);
 }
 JS_PUBLIC_API(bool)
 JS_DefineElement(JSContext *cx, JSObject *objArg, uint32_t index, jsval valueArg,
                  JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs)
 {
     RootedObject obj(cx, objArg);
     RootedValue value(cx, valueArg);
     AutoRooterGetterSetter gsRoot(cx, attrs, &getter, &setter);
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     RootedId id(cx);
     if (!IndexToId(cx, index, &id))
         return false;
     return DefinePropertyById(cx, obj, id, value, GetterWrapper(getter), SetterWrapper(setter),
                               attrs, 0);
 }
 static bool
 DefineProperty(JSContext *cx, HandleObject obj, const char *name, HandleValue value,
                const JSPropertyOpWrapper &getter, const JSStrictPropertyOpWrapper &setter,
                unsigned attrs, unsigned flags)
 {
     AutoRooterGetterSetter gsRoot(cx, attrs, const_cast<JSPropertyOp *>(&getter.op),
                                   const_cast<JSStrictPropertyOp *>(&setter.op));
     RootedId id(cx);
     if (attrs & JSPROP_INDEX) {
         id.set(INT_TO_JSID(intptr_t(name)));
         attrs &= ~JSPROP_INDEX;
     } else {
         JSAtom *atom = Atomize(cx, name, strlen(name));
         if (!atom)
             return false;
         id = AtomToId(atom);
     }
     return DefinePropertyById(cx, obj, id, value, getter, setter, attrs, flags);
 }
 static bool
 DefineSelfHostedProperty(JSContext *cx,
                          HandleObject obj,
                          const char *name,
                          const char *getterName,
                          const char *setterName,
                          unsigned attrs,
                          unsigned flags)
 {
     RootedAtom nameAtom(cx, Atomize(cx, name, strlen(name)));
     if (!nameAtom)
         return false;
     RootedAtom getterNameAtom(cx, Atomize(cx, getterName, strlen(getterName)));
     if (!getterNameAtom)
         return false;
     RootedValue getterValue(cx);
     if (!cx->global()->getSelfHostedFunction(cx, getterNameAtom, nameAtom,
 , &getterValue))
     {
         return false;
     }
     JS_ASSERT(getterValue.isObject() && getterValue.toObject().is<JSFunction>());
     RootedFunction getterFunc(cx, &getterValue.toObject().as<JSFunction>());
     JSPropertyOp getterOp = JS_DATA_TO_FUNC_PTR(PropertyOp, getterFunc.get());
     RootedFunction setterFunc(cx);
     if (setterName) {
         RootedAtom setterNameAtom(cx, Atomize(cx, setterName, strlen(setterName)));
         if (!setterNameAtom)
             return false;
         RootedValue setterValue(cx);
         if (!cx->global()->getSelfHostedFunction(cx, setterNameAtom, nameAtom,
 , &setterValue))
         {
             return false;
         }
         JS_ASSERT(setterValue.isObject() && setterValue.toObject().is<JSFunction>());
         setterFunc = &getterValue.toObject().as<JSFunction>();
     }
     JSStrictPropertyOp setterOp = JS_DATA_TO_FUNC_PTR(StrictPropertyOp, setterFunc.get());
     return DefineProperty(cx, obj, name, JS::UndefinedHandleValue,
                           GetterWrapper(getterOp), SetterWrapper(setterOp),
                           attrs, flags);
 }
 JS_PUBLIC_API(bool)
 JS_DefineProperty(JSContext *cx, HandleObject obj, const char *name, HandleValue value,
                   unsigned attrs,
                   PropertyOp getter /* = nullptr */, JSStrictPropertyOp setter /* = nullptr */)
 {
     return DefineProperty(cx, obj, name, value, GetterWrapper(getter), SetterWrapper(setter),
                           attrs, 0);
 }
 JS_PUBLIC_API(bool)
 JS_DefineProperty(JSContext *cx, HandleObject obj, const char *name, HandleObject valueArg,
                   unsigned attrs,
                   PropertyOp getter /* = nullptr */, JSStrictPropertyOp setter /* = nullptr */)
 {
     RootedValue value(cx, ObjectValue(*valueArg));
     return DefineProperty(cx, obj, name, value, GetterWrapper(getter), SetterWrapper(setter),
                           attrs, 0);
 }
 JS_PUBLIC_API(bool)
 JS_DefineProperty(JSContext *cx, HandleObject obj, const char *name, HandleString valueArg,
                   unsigned attrs,
                   PropertyOp getter /* = nullptr */, JSStrictPropertyOp setter /* = nullptr */)
 {
     RootedValue value(cx, StringValue(valueArg));
     return DefineProperty(cx, obj, name, value, GetterWrapper(getter), SetterWrapper(setter),
                           attrs, 0);
 }
 JS_PUBLIC_API(bool)
 JS_DefineProperty(JSContext *cx, HandleObject obj, const char *name, int32_t valueArg,
                   unsigned attrs,
                   PropertyOp getter /* = nullptr */, JSStrictPropertyOp setter /* = nullptr */)
 {
     Value value = Int32Value(valueArg);
     return DefineProperty(cx, obj, name, HandleValue::fromMarkedLocation(&value),
                           GetterWrapper(getter), SetterWrapper(setter), attrs, 0);
 }
 JS_PUBLIC_API(bool)
 JS_DefineProperty(JSContext *cx, HandleObject obj, const char *name, uint32_t valueArg,
                   unsigned attrs,
                   PropertyOp getter /* = nullptr */, JSStrictPropertyOp setter /* = nullptr */)
 {
     Value value = UINT_TO_JSVAL(valueArg);
     return DefineProperty(cx, obj, name, HandleValue::fromMarkedLocation(&value),
                           GetterWrapper(getter), SetterWrapper(setter), attrs, 0);
 }
 JS_PUBLIC_API(bool)
 JS_DefineProperty(JSContext *cx, HandleObject obj, const char *name, double valueArg,
                   unsigned attrs,
                   PropertyOp getter /* = nullptr */, JSStrictPropertyOp setter /* = nullptr */)
 {
     Value value = NumberValue(valueArg);
     return DefineProperty(cx, obj, name, HandleValue::fromMarkedLocation(&value),
                           GetterWrapper(getter), SetterWrapper(setter), attrs, 0);
 }
 static bool
 DefineUCProperty(JSContext *cx, HandleObject obj, const jschar *name, size_t namelen,
                  const Value &value_, PropertyOp getter, StrictPropertyOp 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, GetterWrapper(getter), SetterWrapper(setter),
                               attrs, flags);
 }
 JS_PUBLIC_API(bool)
 JS_DefineUCProperty(JSContext *cx, JSObject *objArg, const jschar *name, size_t namelen,
                     jsval valueArg, JSPropertyOp getter, JSStrictPropertyOp setter, unsigned attrs)
 {
     RootedObject obj(cx, objArg);
     RootedValue value(cx, valueArg);
     return DefineUCProperty(cx, obj, name, namelen, value, getter, setter, attrs, 0);
 }
 JS_PUBLIC_API(bool)
 JS_DefineOwnProperty(JSContext *cx, HandleObject obj, HandleId id, HandleValue descriptor, bool *bp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, id, descriptor);
     return DefineOwnProperty(cx, obj, id, descriptor, bp);
 }
 JS_PUBLIC_API(JSObject *)
 JS_DefineObject(JSContext *cx, JSObject *objArg, const char *name, const JSClass *jsclasp,
                 JSObject *protoArg, unsigned attrs)
 {
     RootedObject obj(cx, objArg);
     RootedObject proto(cx, protoArg);
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, proto);
     const Class *clasp = Valueify(jsclasp);
     if (!clasp)
         clasp = &JSObject::class_;    /* default class is Object */
     RootedObject nobj(cx, NewObjectWithClassProto(cx, clasp, proto, obj));
     if (!nobj)
         return nullptr;
     RootedValue nobjValue(cx, ObjectValue(*nobj));
     if (!DefineProperty(cx, obj, name, nobjValue, GetterWrapper(nullptr), SetterWrapper(nullptr),
                         attrs, 0)) {
         return nullptr;
     }
     return nobj;
 }
 JS_PUBLIC_API(bool)
 JS_DefineConstDoubles(JSContext *cx, HandleObject obj, const JSConstDoubleSpec *cds)
 {
     bool ok;
     unsigned attrs;
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JSPropertyOpWrapper noget = GetterWrapper(nullptr);
     JSStrictPropertyOpWrapper noset = SetterWrapper(nullptr);
     for (ok = true; cds->name; cds++) {
         RootedValue value(cx, DoubleValue(cds->dval));
         attrs = cds->flags;
         if (!attrs)
             attrs = JSPROP_READONLY | JSPROP_PERMANENT;
         ok = DefineProperty(cx, obj, cds->name, value, noget, noset, attrs, 0);
         if (!ok)
             break;
     }
     return ok;
 }
 JS_PUBLIC_API(bool)
 JS_DefineProperties(JSContext *cx, HandleObject obj, const JSPropertySpec *ps)
 {
     bool ok;
     for (ok = true; ps->name; ps++) {
         if (ps->flags & JSPROP_NATIVE_ACCESSORS) {
             // If you declare native accessors, then you should have a native
             // getter.
             JS_ASSERT(ps->getter.propertyOp.op);
             // If you do not have a self-hosted getter, you should not have a
             // self-hosted setter. This is the closest approximation to that
             // assertion we can have with our setup.
             JS_ASSERT_IF(ps->setter.propertyOp.info, ps->setter.propertyOp.op);
             ok = DefineProperty(cx, obj, ps->name, JS::UndefinedHandleValue,
                                 ps->getter.propertyOp, ps->setter.propertyOp, ps->flags, 0);
         } else {
             // If you have self-hosted getter/setter, you can't have a
             // native one.
             JS_ASSERT(!ps->getter.propertyOp.op && !ps->setter.propertyOp.op);
             JS_ASSERT(ps->flags & JSPROP_GETTER);
             /*
              * During creation of the self-hosting global, we ignore all
              * self-hosted properties, as that means we're currently setting up
              * the global object that the self-hosted code is then compiled
              * in. That means that Self-hosted properties can't be used in the
              * self-hosting global itself, right now.
              */
             if (cx->runtime()->isSelfHostingGlobal(cx->global()))
                 continue;
             ok = DefineSelfHostedProperty(cx, obj, ps->name,
                                           ps->getter.selfHosted.funname,
                                           ps->setter.selfHosted.funname,
                                           ps->flags, 0);
         }
         if (!ok)
             break;
     }
     return ok;
 }
 static bool
 GetPropertyDescriptorById(JSContext *cx, HandleObject obj, HandleId id,
                           MutableHandle<PropertyDescriptor> desc)
 {
     RootedObject obj2(cx);
     RootedShape shape(cx);
     if (!LookupPropertyById(cx, obj, id, &obj2, &shape))
         return false;
     desc.clear();
     if (!shape)
         return true;
     desc.object().set(obj2);
     if (obj2->isNative()) {
         if (IsImplicitDenseOrTypedArrayElement(shape)) {
             desc.setEnumerable();
             desc.value().set(obj2->getDenseOrTypedArrayElement(JSID_TO_INT(id)));
         } else {
             desc.setAttributes(shape->attributes());
             desc.setGetter(shape->getter());
             desc.setSetter(shape->setter());
             JS_ASSERT(desc.value().isUndefined());
             if (shape->hasSlot())
                 desc.value().set(obj2->nativeGetSlot(shape->slot()));
         }
     } else {
         if (obj2->is<ProxyObject>())
             return Proxy::getPropertyDescriptor(cx, obj2, id, desc);
         if (!JSObject::getGenericAttributes(cx, obj2, id, &desc.attributesRef()))
             return false;
         JS_ASSERT(desc.getter() == nullptr);
         JS_ASSERT(desc.setter() == nullptr);
         JS_ASSERT(desc.value().isUndefined());
     }
     return true;
 }
 JS_PUBLIC_API(bool)
 JS_GetOwnPropertyDescriptorById(JSContext *cx, HandleObject obj, HandleId id,
                                 MutableHandle<JSPropertyDescriptor> desc)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return GetOwnPropertyDescriptor(cx, obj, id, desc);
 }
 JS_PUBLIC_API(bool)
 JS_GetOwnPropertyDescriptor(JSContext *cx, HandleObject obj, const char *name,
                             MutableHandle<JSPropertyDescriptor> desc)
 {
     JSAtom *atom = Atomize(cx, name, strlen(name));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_GetOwnPropertyDescriptorById(cx, obj, id, desc);
 }
 JS_PUBLIC_API(bool)
 JS_GetPropertyDescriptorById(JSContext *cx, HandleObject obj, HandleId id,
                              MutableHandle<JSPropertyDescriptor> desc)
 {
     return GetPropertyDescriptorById(cx, obj, id, desc);
 }
 JS_PUBLIC_API(bool)
 JS_GetPropertyDescriptor(JSContext *cx, HandleObject obj, const char *name,
                          MutableHandle<JSPropertyDescriptor> desc)
 {
     JSAtom *atom = Atomize(cx, name, strlen(name));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return atom && JS_GetPropertyDescriptorById(cx, obj, id, desc);
 }
 JS_PUBLIC_API(bool)
 JS_GetPropertyById(JSContext *cx, HandleObject obj, HandleId id, MutableHandleValue vp)
 {
     return JS_ForwardGetPropertyTo(cx, obj, id, obj, vp);
 }
 JS_PUBLIC_API(bool)
 JS_ForwardGetPropertyTo(JSContext *cx, JS::HandleObject obj, JS::HandleId id, JS::HandleObject onBehalfOf,
                         JS::MutableHandleValue vp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, id);
     assertSameCompartment(cx, onBehalfOf);
     return JSObject::getGeneric(cx, obj, onBehalfOf, id, vp);
 }
 JS_PUBLIC_API(bool)
 JS_GetElement(JSContext *cx, HandleObject objArg, uint32_t index, MutableHandleValue vp)
 {
     return JS_ForwardGetElementTo(cx, objArg, index, objArg, vp);
 }
 JS_PUBLIC_API(bool)
 JS_ForwardGetElementTo(JSContext *cx, HandleObject obj, uint32_t index, HandleObject onBehalfOf,
                        MutableHandleValue vp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     return JSObject::getElement(cx, obj, onBehalfOf, index, vp);
 }
 JS_PUBLIC_API(bool)
 JS_GetProperty(JSContext *cx, HandleObject obj, const char *name, MutableHandleValue vp)
 {
     JSAtom *atom = Atomize(cx, name, strlen(name));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_GetPropertyById(cx, obj, id, vp);
 }
 JS_PUBLIC_API(bool)
 JS_GetUCProperty(JSContext *cx, HandleObject obj, const jschar *name, size_t namelen,
                  MutableHandleValue vp)
 {
     JSAtom *atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_GetPropertyById(cx, obj, id, vp);
 }
 JS_PUBLIC_API(bool)
 JS_SetPropertyById(JSContext *cx, HandleObject obj, HandleId id, HandleValue v)
 {
     RootedValue value(cx, v);
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, id);
     return JSObject::setGeneric(cx, obj, obj, id, &value, false);
 }
 static bool
 SetElement(JSContext *cx, HandleObject obj, uint32_t index, MutableHandleValue vp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, vp);
     return JSObject::setElement(cx, obj, obj, index, vp, false);
 }
 JS_PUBLIC_API(bool)
 JS_SetElement(JSContext *cx, HandleObject obj, uint32_t index, HandleValue v)
 {
     RootedValue value(cx, v);
     return SetElement(cx, obj, index, &value);
 }
 JS_PUBLIC_API(bool)
 JS_SetElement(JSContext *cx, HandleObject obj, uint32_t index, HandleObject v)
 {
     RootedValue value(cx, ObjectOrNullValue(v));
     return SetElement(cx, obj, index, &value);
 }
 JS_PUBLIC_API(bool)
 JS_SetElement(JSContext *cx, HandleObject obj, uint32_t index, HandleString v)
 {
     RootedValue value(cx, StringValue(v));
     return SetElement(cx, obj, index, &value);
 }
 JS_PUBLIC_API(bool)
 JS_SetElement(JSContext *cx, HandleObject obj, uint32_t index, int32_t v)
 {
     RootedValue value(cx, NumberValue(v));
     return SetElement(cx, obj, index, &value);
 }
 JS_PUBLIC_API(bool)
 JS_SetElement(JSContext *cx, HandleObject obj, uint32_t index, uint32_t v)
 {
     RootedValue value(cx, NumberValue(v));
     return SetElement(cx, obj, index, &value);
 }
 JS_PUBLIC_API(bool)
 JS_SetElement(JSContext *cx, HandleObject obj, uint32_t index, double v)
 {
     RootedValue value(cx, NumberValue(v));
     return SetElement(cx, obj, index, &value);
 }
 JS_PUBLIC_API(bool)
 JS_SetProperty(JSContext *cx, HandleObject obj, const char *name, HandleValue v)
 {
     JSAtom *atom = Atomize(cx, name, strlen(name));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_SetPropertyById(cx, obj, id, v);
 }
 JS_PUBLIC_API(bool)
 JS_SetUCProperty(JSContext *cx, HandleObject obj, const jschar *name, size_t namelen,
                  HandleValue v)
 {
     JSAtom *atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
     if (!atom)
         return false;
     RootedId id(cx, AtomToId(atom));
     return JS_SetPropertyById(cx, obj, id, v);
 }
 JS_PUBLIC_API(bool)
 JS_DeletePropertyById2(JSContext *cx, HandleObject obj, HandleId id, bool *result)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, id);
     return JSObject::deleteByValue(cx, obj, IdToValue(id), result);
 }
 JS_PUBLIC_API(bool)
 JS_DeleteElement2(JSContext *cx, HandleObject obj, uint32_t index, bool *result)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     return JSObject::deleteElement(cx, obj, index, result);
 }
 JS_PUBLIC_API(bool)
 JS_DeleteProperty2(JSContext *cx, HandleObject obj, const char *name, bool *result)
 {
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     JSAtom *atom = Atomize(cx, name, strlen(name));
     if (!atom)
         return false;
     return JSObject::deleteByValue(cx, obj, StringValue(atom), result);
 }
 JS_PUBLIC_API(bool)
 JS_DeleteUCProperty2(JSContext *cx, HandleObject obj, const jschar *name, size_t namelen,
                      bool *result)
 {
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     JSAtom *atom = AtomizeChars(cx, name, AUTO_NAMELEN(name, namelen));
     if (!atom)
         return false;
     return JSObject::deleteByValue(cx, obj, StringValue(atom), result);
 }
 JS_PUBLIC_API(bool)
 JS_DeletePropertyById(JSContext *cx, HandleObject obj, HandleId id)
 {
     bool junk;
     return JS_DeletePropertyById2(cx, obj, id, &junk);
 }
 JS_PUBLIC_API(bool)
 JS_DeleteElement(JSContext *cx, HandleObject obj, uint32_t index)
 {
     bool junk;
     return JS_DeleteElement2(cx, obj, index, &junk);
 }
 JS_PUBLIC_API(bool)
 JS_DeleteProperty(JSContext *cx, HandleObject obj, const char *name)
 {
     bool junk;
     return JS_DeleteProperty2(cx, obj, name, &junk);
 }
 static Shape *
 LastConfigurableShape(JSObject *obj)
 {
     for (Shape::Range<NoGC> r(obj->lastProperty()); !r.empty(); r.popFront()) {
         Shape *shape = &r.front();
         if (shape->configurable())
             return shape;
     }
     return nullptr;
 }
 JS_PUBLIC_API(void)
 JS_ClearNonGlobalObject(JSContext *cx, HandleObject obj)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     JS_ASSERT(!obj->is<GlobalObject>());
     if (!obj->isNative())
         return;
     /* Remove all configurable properties from obj. */
     RootedShape shape(cx);
     while ((shape = LastConfigurableShape(obj))) {
         if (!obj->removeProperty(cx, shape->propid()))
             return;
     }
     /* Set all remaining writable plain data properties to undefined. */
     for (Shape::Range<NoGC> r(obj->lastProperty()); !r.empty(); r.popFront()) {
         Shape *shape = &r.front();
         if (shape->isDataDescriptor() &&
             shape->writable() &&
             shape->hasDefaultSetter() &&
             shape->hasSlot())
         {
             obj->nativeSetSlot(shape->slot(), UndefinedValue());
         }
     }
 }
 JS_PUBLIC_API(void)
 JS_SetAllNonReservedSlotsToUndefined(JSContext *cx, JSObject *objArg)
 {
     RootedObject obj(cx, objArg);
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     if (!obj->isNative())
         return;
     const Class *clasp = obj->getClass();
     unsigned numReserved = JSCLASS_RESERVED_SLOTS(clasp);
     unsigned numSlots = obj->slotSpan();
     for (unsigned i = numReserved; i < numSlots; i++)
         obj->setSlot(i, UndefinedValue());
 }
 JS_PUBLIC_API(JSIdArray *)
 JS_Enumerate(JSContext *cx, HandleObject obj)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     AutoIdVector props(cx);
     JSIdArray *ida;
     if (!GetPropertyNames(cx, obj, JSITER_OWNONLY, &props) || !VectorToIdArray(cx, props, &ida))
         return nullptr;
     return ida;
 }
 /*
  * XXX reverse iterator for properties, unreverse and meld with jsinterp.c's
  *     prop_iterator_class somehow...
  * + preserve the obj->enumerate API while optimizing the native object case
  * + native case here uses a JSShape *, but that iterates in reverse!
  * + so we make non-native match, by reverse-iterating after JS_Enumerating
  */
 static const uint32_t JSSLOT_ITER_INDEX = 0;
 static void
 prop_iter_finalize(FreeOp *fop, JSObject *obj)
 {
     void *pdata = obj->getPrivate();
     if (!pdata)
         return;
     if (obj->getSlot(JSSLOT_ITER_INDEX).toInt32() >= 0) {
         /* Non-native case: destroy the ida enumerated when obj was created. */
         JSIdArray *ida = (JSIdArray *) pdata;
         fop->free_(ida);
     }
 }
 static void
 prop_iter_trace(JSTracer *trc, JSObject *obj)
 {
     void *pdata = obj->getPrivate();
     if (!pdata)
         return;
     if (obj->getSlot(JSSLOT_ITER_INDEX).toInt32() < 0) {
         /*
          * Native case: just mark the next property to visit. We don't need a
          * barrier here because the pointer is updated via setPrivate, which
          * always takes a barrier.
          */
         Shape *tmp = static_cast<Shape *>(pdata);
         MarkShapeUnbarriered(trc, &tmp, "prop iter shape");
         obj->setPrivateUnbarriered(tmp);
     } else {
         /* Non-native case: mark each id in the JSIdArray private. */
         JSIdArray *ida = (JSIdArray *) pdata;
         MarkIdRange(trc, ida->length, ida->vector, "prop iter");
     }
 }
 static const Class prop_iter_class = {
     "PropertyIterator",
     JSCLASS_HAS_PRIVATE | JSCLASS_IMPLEMENTS_BARRIERS | JSCLASS_HAS_RESERVED_SLOTS(1),
     JS_PropertyStub,         /* addProperty */
     JS_DeletePropertyStub,   /* delProperty */
     JS_PropertyStub,         /* getProperty */
     JS_StrictPropertyStub,   /* setProperty */
     JS_EnumerateStub,
     JS_ResolveStub,
     JS_ConvertStub,
     prop_iter_finalize,
     nullptr,        /* call        */
     nullptr,        /* hasInstance */
     nullptr,        /* construct   */
     prop_iter_trace
 };
 JS_PUBLIC_API(JSObject *)
 JS_NewPropertyIterator(JSContext *cx, HandleObject obj)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     RootedObject iterobj(cx, NewObjectWithClassProto(cx, &prop_iter_class, nullptr, obj));
     if (!iterobj)
         return nullptr;
     int index;
     if (obj->isNative()) {
         /* Native case: start with the last property in obj. */
         iterobj->setPrivateGCThing(obj->lastProperty());
         index = -1;
     } else {
         /* Non-native case: enumerate a JSIdArray and keep it via private. */
         JSIdArray *ida = JS_Enumerate(cx, obj);
         if (!ida)
             return nullptr;
         iterobj->setPrivate((void *)ida);
         index = ida->length;
     }
     /* iterobj cannot escape to other threads here. */
     iterobj->setSlot(JSSLOT_ITER_INDEX, Int32Value(index));
     return iterobj;
 }
 JS_PUBLIC_API(bool)
 JS_NextProperty(JSContext *cx, HandleObject iterobj, jsid *idp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, iterobj);
     int32_t i = iterobj->getSlot(JSSLOT_ITER_INDEX).toInt32();
     if (i < 0) {
         /* Native case: private data is a property tree node pointer. */
         JS_ASSERT(iterobj->getParent()->isNative());
         Shape *shape = static_cast<Shape *>(iterobj->getPrivate());
         while (shape->previous() && !shape->enumerable())
             shape = shape->previous();
         if (!shape->previous()) {
             JS_ASSERT(shape->isEmptyShape());
             *idp = JSID_VOID;
         } else {
             iterobj->setPrivateGCThing(const_cast<Shape *>(shape->previous().get()));
             *idp = shape->propid();
         }
     } else {
         /* Non-native case: use the ida enumerated when iterobj was created. */
         JSIdArray *ida = (JSIdArray *) iterobj->getPrivate();
         JS_ASSERT(i <= ida->length);
         STATIC_ASSUME(i <= ida->length);
         if (i == 0) {
             *idp = JSID_VOID;
         } else {
             *idp = ida->vector[--i];
             iterobj->setSlot(JSSLOT_ITER_INDEX, Int32Value(i));
         }
     }
     return true;
 }
 JS_PUBLIC_API(jsval)
 JS_GetReservedSlot(JSObject *obj, uint32_t index)
 {
     return obj->getReservedSlot(index);
 }
 JS_PUBLIC_API(void)
 JS_SetReservedSlot(JSObject *obj, uint32_t index, Value value)
 {
     obj->setReservedSlot(index, value);
 }
 JS_PUBLIC_API(JSObject *)
 JS_NewArrayObject(JSContext *cx, const JS::HandleValueArray& contents)
 {
     JS_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)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return NewDenseAllocatedArray(cx, length);
 }
 JS_PUBLIC_API(bool)
 JS_IsArrayObject(JSContext *cx, JS::HandleObject obj)
 {
     assertSameCompartment(cx, obj);
     return ObjectClassIs(obj, ESClass_Array, cx);
 }
 JS_PUBLIC_API(bool)
 JS_IsArrayObject(JSContext *cx, JS::HandleValue value)
 {
     if (!value.isObject())
         return false;
     RootedObject obj(cx, &value.toObject());
     return JS_IsArrayObject(cx, obj);
 }
 JS_PUBLIC_API(bool)
 JS_GetArrayLength(JSContext *cx, HandleObject obj, uint32_t *lengthp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     return GetLengthProperty(cx, obj, lengthp);
 }
 JS_PUBLIC_API(bool)
 JS_SetArrayLength(JSContext *cx, HandleObject obj, uint32_t length)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     return SetLengthProperty(cx, obj, length);
 }
 JS_PUBLIC_API(void)
 JS_HoldPrincipals(JSPrincipals *principals)
 {
     ++principals->refcount;
 }
 JS_PUBLIC_API(void)
 JS_DropPrincipals(JSRuntime *rt, JSPrincipals *principals)
 {
     int rc = --principals->refcount;
     if (rc == 0)
         rt->destroyPrincipals(principals);
 }
 JS_PUBLIC_API(void)
 JS_SetSecurityCallbacks(JSRuntime *rt, const JSSecurityCallbacks *scb)
 {
     JS_ASSERT(scb != &NullSecurityCallbacks);
     rt->securityCallbacks = scb ? scb : &NullSecurityCallbacks;
 }
 JS_PUBLIC_API(const JSSecurityCallbacks *)
 JS_GetSecurityCallbacks(JSRuntime *rt)
 {
     return (rt->securityCallbacks != &NullSecurityCallbacks) ? rt->securityCallbacks : nullptr;
 }
 JS_PUBLIC_API(void)
 JS_SetTrustedPrincipals(JSRuntime *rt, const JSPrincipals *prin)
 {
     rt->setTrustedPrincipals(prin);
 }
 extern JS_PUBLIC_API(void)
 JS_InitDestroyPrincipalsCallback(JSRuntime *rt, JSDestroyPrincipalsOp destroyPrincipals)
 {
     JS_ASSERT(destroyPrincipals);
     JS_ASSERT(!rt->destroyPrincipals);
     rt->destroyPrincipals = destroyPrincipals;
 }
 JS_PUBLIC_API(JSFunction *)
 JS_NewFunction(JSContext *cx, JSNative native, unsigned nargs, unsigned flags,
                HandleObject parent, const char *name)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, parent);
     RootedAtom atom(cx);
     if (name) {
         atom = Atomize(cx, name, strlen(name));
         if (!atom)
             return nullptr;
     }
     JSFunction::Flags funFlags = JSAPIToJSFunctionFlags(flags);
     return NewFunction(cx, NullPtr(), native, nargs, funFlags, parent, atom);
 }
 JS_PUBLIC_API(JSFunction *)
 JS_NewFunctionById(JSContext *cx, JSNative native, unsigned nargs, unsigned flags,
                    HandleObject parent, HandleId id)
 {
     JS_ASSERT(JSID_IS_STRING(id));
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     JS_ASSERT(native);
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, parent);
     RootedAtom name(cx, JSID_TO_ATOM(id));
     JSFunction::Flags funFlags = JSAPIToJSFunctionFlags(flags);
     return NewFunction(cx, NullPtr(), native, nargs, funFlags, parent, name);
 }
 JS_PUBLIC_API(JSFunction *)
 JS::GetSelfHostedFunction(JSContext *cx, const char *selfHostedName, HandleId id, unsigned nargs)
 {
     JS_ASSERT(JSID_IS_STRING(id));
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     RootedAtom name(cx, JSID_TO_ATOM(id));
     RootedAtom shName(cx, Atomize(cx, selfHostedName, strlen(selfHostedName)));
     if (!shName)
         return nullptr;
     RootedValue funVal(cx);
     if (!cx->global()->getSelfHostedFunction(cx, shName, name, nargs, &funVal))
         return nullptr;
     return &funVal.toObject().as<JSFunction>();
 }
 JS_PUBLIC_API(JSObject *)
 JS_CloneFunctionObject(JSContext *cx, HandleObject funobj, HandleObject parentArg)
 {
     RootedObject parent(cx, parentArg);
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, parent);
     // Note that funobj can be in a different compartment.
     if (!parent)
         parent = cx->global();
     if (!funobj->is<JSFunction>()) {
         AutoCompartment ac(cx, funobj);
         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 a function was compiled to be lexically nested inside some other
      * script, we cannot clone it without breaking the compiler's assumptions.
      */
     if (fun->isInterpreted() && (fun->nonLazyScript()->enclosingStaticScope() ||
         (fun->nonLazyScript()->compileAndGo() && !parent->is<GlobalObject>())))
     {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_CLONE_FUNOBJ_SCOPE);
         return nullptr;
     }
     if (fun->isBoundFunction()) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_CLONE_OBJECT);
         return nullptr;
     }
     if (fun->isNative() && IsAsmJSModuleNative(fun->native())) {
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_CLONE_OBJECT);
         return nullptr;
     }
     return CloneFunctionObject(cx, fun, parent, fun->getAllocKind());
 }
 JS_PUBLIC_API(JSObject *)
 JS_GetFunctionObject(JSFunction *fun)
 {
     return fun;
 }
 JS_PUBLIC_API(JSString *)
 JS_GetFunctionId(JSFunction *fun)
 {
     return fun->atom();
 }
 JS_PUBLIC_API(JSString *)
 JS_GetFunctionDisplayId(JSFunction *fun)
 {
     return fun->displayAtom();
 }
 JS_PUBLIC_API(uint16_t)
 JS_GetFunctionArity(JSFunction *fun)
 {
     return fun->nargs();
 }
 JS_PUBLIC_API(bool)
 JS_ObjectIsFunction(JSContext *cx, JSObject *obj)
 {
     return obj->is<JSFunction>();
 }
 JS_PUBLIC_API(bool)
 JS_ObjectIsCallable(JSContext *cx, JSObject *obj)
 {
     return obj->isCallable();
 }
 JS_PUBLIC_API(bool)
 JS_IsNativeFunction(JSObject *funobj, JSNative call)
 {
     if (!funobj->is<JSFunction>())
         return false;
     JSFunction *fun = &funobj->as<JSFunction>();
     return fun->isNative() && fun->native() == call;
 }
 extern JS_PUBLIC_API(bool)
 JS_IsConstructor(JSFunction *fun)
 {
     return fun->isNativeConstructor() || fun->isInterpretedConstructor();
 }
 JS_PUBLIC_API(JSObject*)
 JS_BindCallable(JSContext *cx, HandleObject target, HandleObject newThis)
 {
     RootedValue thisArg(cx, ObjectValue(*newThis));
     return js_fun_bind(cx, target, thisArg, nullptr, 0);
 }
 static bool
 js_generic_native_method_dispatcher(JSContext *cx, unsigned argc, Value *vp)
 {
     CallArgs args = CallArgsFromVp(argc, vp);
     const JSFunctionSpec *fs = (JSFunctionSpec *)
         args.callee().as<JSFunction>().getExtendedSlot(0).toPrivate();
     JS_ASSERT((fs->flags & JSFUN_GENERIC_NATIVE) != 0);
     if (argc < 1) {
         js_ReportMissingArg(cx, args.calleev(), 0);
         return false;
     }
     /*
      * Copy all actual (argc) arguments down over our |this| parameter, vp[1],
      * which is almost always the class constructor object, e.g. Array.  Then
      * call the corresponding prototype native method with our first argument
      * passed as |this|.
      */
     memmove(vp + 1, vp + 2, argc * sizeof(jsval));
     /* Clear the last parameter in case too few arguments were passed. */
     vp[2 + --argc].setUndefined();
     return fs->call.op(cx, argc, vp);
 }
 JS_PUBLIC_API(bool)
 JS_DefineFunctions(JSContext *cx, HandleObject obj, const JSFunctionSpec *fs)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     RootedObject ctor(cx);
     for (; fs->name; fs++) {
         RootedAtom atom(cx);
         // If the name starts with "@@", it must be a well-known symbol.
         if (fs->name[0] != '@' || fs->name[1] != '@')
             atom = Atomize(cx, fs->name, strlen(fs->name));
         else if (strcmp(fs->name, "@@iterator") == 0)
             // FIXME: This atom should be a symbol: bug 918828.
             atom = cx->names().std_iterator;
         else
             JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_SYMBOL, fs->name);
         if (!atom)
             return false;
         Rooted<jsid> id(cx, AtomToId(atom));
         /*
          * Define a generic arity N+1 static method for the arity N prototype
          * method if flags contains JSFUN_GENERIC_NATIVE.
          */
         unsigned flags = fs->flags;
         if (flags & JSFUN_GENERIC_NATIVE) {
             if (!ctor) {
                 ctor = JS_GetConstructor(cx, obj);
                 if (!ctor)
                     return false;
             }
             flags &= ~JSFUN_GENERIC_NATIVE;
             JSFunction *fun = DefineFunction(cx, ctor, id,
                                              js_generic_native_method_dispatcher,
                                              fs->nargs + 1, flags,
                                              JSFunction::ExtendedFinalizeKind);
             if (!fun)
                 return false;
             /*
              * As jsapi.h notes, fs must point to storage that lives as long
              * as fun->object lives.
              */
             fun->setExtendedSlot(0, PrivateValue(const_cast<JSFunctionSpec*>(fs)));
         }
         /*
          * Delay cloning self-hosted functions until they are called. This is
          * achieved by passing DefineFunction a nullptr JSNative which
          * produces an interpreted JSFunction where !hasScript. Interpreted
          * call paths then call InitializeLazyFunctionScript if !hasScript.
          */
         if (fs->selfHostedName) {
             JS_ASSERT(!fs->call.op);
             JS_ASSERT(!fs->call.info);
             /*
              * During creation of the self-hosting global, we ignore all
              * self-hosted functions, as that means we're currently setting up
              * the global object that the self-hosted code is then compiled
              * in. Self-hosted functions can access each other via their names,
              * but not via the builtin classes they get installed into.
              */
             if (cx->runtime()->isSelfHostingGlobal(cx->global()))
                 continue;
             RootedAtom shName(cx, Atomize(cx, fs->selfHostedName, strlen(fs->selfHostedName)));
             if (!shName)
                 return false;
             RootedValue funVal(cx);
             if (!cx->global()->getSelfHostedFunction(cx, shName, atom, fs->nargs, &funVal))
                 return false;
             if (!JSObject::defineGeneric(cx, obj, id, funVal, nullptr, nullptr, flags))
                 return false;
         } else {
             JSFunction *fun = DefineFunction(cx, obj, id, fs->call.op, fs->nargs, flags);
             if (!fun)
                 return false;
             if (fs->call.info)
                 fun->setJitInfo(fs->call.info);
         }
     }
     return true;
 }
 JS_PUBLIC_API(JSFunction *)
 JS_DefineFunction(JSContext *cx, HandleObject obj, const char *name, JSNative call,
                   unsigned nargs, unsigned attrs)
 {
     JS_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 jschar *name, size_t namelen, JSNative call,
                     unsigned nargs, unsigned attrs)
 {
     JS_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)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     return DefineFunction(cx, obj, id, call, nargs, attrs);
 }
 struct AutoLastFrameCheck
 {
     AutoLastFrameCheck(JSContext *cx
                        MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
       : cx(cx)
     {
         JS_ASSERT(cx);
         MOZ_GUARD_OBJECT_NOTIFIER_INIT;
     }
     ~AutoLastFrameCheck() {
         if (cx->isExceptionPending() &&
             !JS_IsRunning(cx) &&
             !cx->options().dontReportUncaught()) {
             js_ReportUncaughtException(cx);
         }
     }
   private:
     JSContext *cx;
     MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
 };
 /* Use the fastest available getc. */
 #if defined(HAVE_GETC_UNLOCKED)
 # define fast_getc getc_unlocked
 #elif defined(HAVE__GETC_NOLOCK)
 # define fast_getc _getc_nolock
 #else
 # define fast_getc getc
 #endif
 typedef js::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)
     {
         JS_ASSERT(fp_);
         return ReadCompleteFile(cx, fp_, buffer);
     }
 };
 } /* anonymous namespace */
 /*
  * Open a source file for reading. Supports "-" and nullptr to mean stdin. The
  * return value must be fclosed unless it is stdin.
  */
 bool
 AutoFile::open(JSContext *cx, const char *filename)
 {
     if (!filename || strcmp(filename, "-") == 0) {
         fp_ = stdin;
     } else {
         fp_ = fopen(filename, "r");
         if (!fp_) {
             JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_CANT_OPEN,
                                  filename, "No such file or directory");
             return false;
         }
     }
     return true;
 }
 JSObject * const JS::ReadOnlyCompileOptions::nullObjectPtr = nullptr;
 void
 JS::ReadOnlyCompileOptions::copyPODOptions(const ReadOnlyCompileOptions &rhs)
 {
     version = rhs.version;
     versionSet = rhs.versionSet;
     utf8 = rhs.utf8;
     lineno = rhs.lineno;
     column = rhs.column;
     compileAndGo = rhs.compileAndGo;
     forEval = rhs.forEval;
     noScriptRval = rhs.noScriptRval;
     selfHostingMode = rhs.selfHostingMode;
     canLazilyParse = rhs.canLazilyParse;
     strictOption = rhs.strictOption;
     extraWarningsOption = rhs.extraWarningsOption;
     werrorOption = rhs.werrorOption;
     asmJSOption = rhs.asmJSOption;
     forceAsync = rhs.forceAsync;
     installedFile = rhs.installedFile;
     sourceIsLazy = rhs.sourceIsLazy;
     introductionType = rhs.introductionType;
     introductionLineno = rhs.introductionLineno;
     introductionOffset = rhs.introductionOffset;
     hasIntroductionInfo = rhs.hasIntroductionInfo;
 }
 JSPrincipals *
 JS::ReadOnlyCompileOptions::originPrincipals(ExclusiveContext *cx) const
 {
     return NormalizeOriginPrincipals(cx->compartment()->principals, originPrincipals_);
 }
 JS::OwningCompileOptions::OwningCompileOptions(JSContext *cx)
     : ReadOnlyCompileOptions(),
       runtime(GetRuntime(cx)),
       elementRoot(cx),
       elementAttributeNameRoot(cx),
       introductionScriptRoot(cx)
 {
 }
 JS::OwningCompileOptions::~OwningCompileOptions()
 {
     if (originPrincipals_)
         JS_DropPrincipals(runtime, originPrincipals_);
     // OwningCompileOptions always owns these, so these casts are okay.
     js_free(const_cast<char *>(filename_));
     js_free(const_cast<jschar *>(sourceMapURL_));
     js_free(const_cast<char *>(introducerFilename_));
 }
 bool
 JS::OwningCompileOptions::copy(JSContext *cx, const ReadOnlyCompileOptions &rhs)
 {
     copyPODOptions(rhs);
     setOriginPrincipals(rhs.originPrincipals(cx));
     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 jschar *s)
 {
     jschar *copy = nullptr;
     if (s) {
         copy = js_strdup(cx, s);
         if (!copy)
             return false;
     }
     // OwningCompileOptions always owns sourceMapURL_, so this cast is okay.
     js_free(const_cast<jschar *>(sourceMapURL_));
     sourceMapURL_ = copy;
     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;
 }
 bool
 JS::OwningCompileOptions::wrap(JSContext *cx, JSCompartment *compartment)
 {
     if (!compartment->wrap(cx, &elementRoot))
         return false;
     if (elementAttributeNameRoot) {
         if (!compartment->wrap(cx, elementAttributeNameRoot.address()))
             return false;
     }
     // There is no equivalent of cross-compartment wrappers for scripts. If
     // the introduction script would be in a different compartment from the
     // compiled code, we would be creating a cross-compartment script
     // reference, which would be bogus. In that case, just don't bother to
     // retain the introduction script.
     if (introductionScriptRoot) {
         if (introductionScriptRoot->compartment() != compartment)
             introductionScriptRoot = nullptr;
     }
     return true;
 }
 JS::CompileOptions::CompileOptions(JSContext *cx, JSVersion version)
     : ReadOnlyCompileOptions(), elementRoot(cx), elementAttributeNameRoot(cx),
       introductionScriptRoot(cx)
 {
     this->version = (version != JSVERSION_UNKNOWN) ? version : cx->findVersion();
     compileAndGo = false;
     noScriptRval = cx->options().noScriptRval();
     strictOption = cx->options().strictMode();
     extraWarningsOption = cx->options().extraWarnings();
     werrorOption = cx->options().werror();
     asmJSOption = cx->runtime()->options().asmJS();
 }
 bool
 JS::CompileOptions::wrap(JSContext *cx, JSCompartment *compartment)
 {
     if (!compartment->wrap(cx, &elementRoot))
         return false;
     if (elementAttributeNameRoot) {
         if (!compartment->wrap(cx, elementAttributeNameRoot.address()))
             return false;
     }
     // There is no equivalent of cross-compartment wrappers for scripts. If
     // the introduction script would be in a different compartment from the
     // compiled code, we would be creating a cross-compartment script
     // reference, which would be bogus. In that case, just don't bother to
     // retain the introduction script.
     if (introductionScriptRoot) {
         if (introductionScriptRoot->compartment() != compartment)
             introductionScriptRoot = nullptr;
     }
     return true;
 }
 bool
 JS::Compile(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options,
             SourceBufferHolder &srcBuf, MutableHandleScript script)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     AutoLastFrameCheck lfc(cx);
     script.set(frontend::CompileScript(cx, &cx->tempLifoAlloc(), obj, NullPtr(), options, srcBuf));
     return !!script;
 }
 JSScript *
 JS::Compile(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options,
             const jschar *chars, size_t length)
 {
     SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::NoOwnership);
     RootedScript script(cx);
     if (!Compile(cx, obj, options, srcBuf, &script))
         return nullptr;
     return script;
 }
 JSScript *
 JS::Compile(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options,
             const char *bytes, size_t length)
 {
     jschar *chars;
     if (options.utf8)
         chars = UTF8CharsToNewTwoByteCharsZ(cx, UTF8Chars(bytes, length), &length).get();
     else
         chars = InflateString(cx, bytes, &length);
     if (!chars)
         return nullptr;
     JSScript *script = Compile(cx, obj, options, chars, length);
     js_free(chars);
     return script;
 }
 JSScript *
 JS::Compile(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options, FILE *fp)
 {
     FileContents buffer(cx);
     if (!ReadCompleteFile(cx, fp, buffer))
         return nullptr;
     JSScript *script = Compile(cx, obj, options, buffer.begin(), buffer.length());
     return script;
 }
 JSScript *
 JS::Compile(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg, const char *filename)
 {
     AutoFile file;
     if (!file.open(cx, filename))
         return nullptr;
     CompileOptions options(cx, optionsArg);
     options.setFileAndLine(filename, 1);
     return Compile(cx, obj, options, file.fp());
 }
 JS_PUBLIC_API(bool)
 JS::CanCompileOffThread(JSContext *cx, const ReadOnlyCompileOptions &options, size_t length)
 {
     static const size_t TINY_LENGTH = 1000;
     static const size_t HUGE_LENGTH = 100 * 1000;
     // These are heuristics which the caller may choose to ignore (e.g., for
     // testing purposes).
     if (!options.forceAsync) {
         // Compiling off the main thread inolves creating a new Zone and other
         // significant overheads.  Don't bother if the script is tiny.
         if (length < TINY_LENGTH)
             return false;
 #ifdef JS_THREADSAFE
         // 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;
 #endif // JS_THREADSAFE
     }
     return cx->runtime()->canUseParallelParsing();
 }
 JS_PUBLIC_API(bool)
 JS::CompileOffThread(JSContext *cx, const ReadOnlyCompileOptions &options,
                      const jschar *chars, size_t length,
                      OffThreadCompileCallback callback, void *callbackData)
 {
     JS_ASSERT(CanCompileOffThread(cx, options, length));
     return StartOffThreadParseScript(cx, options, chars, length, callback, callbackData);
 }
 JS_PUBLIC_API(JSScript *)
 JS::FinishOffThreadScript(JSContext *maybecx, JSRuntime *rt, void *token)
 {
 #ifdef JS_THREADSAFE
     JS_ASSERT(CurrentThreadCanAccessRuntime(rt));
     if (maybecx) {
         RootedScript script(maybecx);
         {
             AutoLastFrameCheck lfc(maybecx);
             script = WorkerThreadState().finishParseTask(maybecx, rt, token);
         }
         return script;
     } else {
         return WorkerThreadState().finishParseTask(maybecx, rt, token);
     }
 #else
     MOZ_ASSUME_UNREACHABLE("Off thread compilation is not available.");
 #endif
 }
 JS_PUBLIC_API(JSScript *)
 JS_CompileScript(JSContext *cx, JS::HandleObject obj, const char *ascii,
                  size_t length, const JS::CompileOptions &options)
 {
     return Compile(cx, obj, options, ascii, length);
 }
 JS_PUBLIC_API(JSScript *)
 JS_CompileUCScript(JSContext *cx, JS::HandleObject obj, const jschar *chars,
                    size_t length, const JS::CompileOptions &options)
 {
     return Compile(cx, obj, options, chars, length);
 }
 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();
     jschar *chars = JS::UTF8CharsToNewTwoByteCharsZ(cx, JS::UTF8Chars(utf8, length), &length).get();
     if (!chars)
         return true;
     // Return true on any out-of-memory error or non-EOF-related syntax error, so our
     // caller doesn't try to collect more buffered source.
     bool result = true;
     CompileOptions options(cx);
     options.setCompileAndGo(false);
     Parser<frontend::FullParseHandler> parser(cx, &cx->tempLifoAlloc(),
                                               options, chars, length,
                                               /* foldConstants = */ true, nullptr, nullptr);
     JSErrorReporter older = JS_SetErrorReporter(cx, nullptr);
     if (!parser.parse(obj)) {
         // We ran into an error. If it was because we ran out of source, we
         // return false so our caller knows to try to collect more buffered
         // source.
         if (parser.isUnexpectedEOF())
             result = false;
         cx->clearPendingException();
     }
     JS_SetErrorReporter(cx, older);
     js_free(chars);
     return result;
 }
 JS_PUBLIC_API(JSObject *)
 JS_GetGlobalFromScript(JSScript *script)
 {
     JS_ASSERT(!script->isCachedEval());
     return &script->global();
 }
 JS_PUBLIC_API(bool)
 JS::CompileFunction(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options,
                     const char *name, unsigned nargs, const char *const *argnames,
                     SourceBufferHolder &srcBuf, MutableHandleFunction fun)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     RootedAtom funAtom(cx);
     AutoLastFrameCheck lfc(cx);
     if (name) {
         funAtom = Atomize(cx, name, strlen(name));
         if (!funAtom)
             return false;
     }
     AutoNameVector formals(cx);
     for (unsigned i = 0; i < nargs; i++) {
         RootedAtom argAtom(cx, Atomize(cx, argnames[i], strlen(argnames[i])));
         if (!argAtom || !formals.append(argAtom->asPropertyName()))
             return false;
     }
     fun.set(NewFunction(cx, NullPtr(), nullptr, 0, JSFunction::INTERPRETED, obj,
                         funAtom, JSFunction::FinalizeKind, TenuredObject));
     if (!fun)
         return false;
     if (!frontend::CompileFunctionBody(cx, fun, options, formals, srcBuf))
         return false;
     if (obj && funAtom && options.defineOnScope) {
         Rooted<jsid> id(cx, AtomToId(funAtom));
         RootedValue value(cx, ObjectValue(*fun));
         if (!JSObject::defineGeneric(cx, obj, id, value, nullptr, nullptr, JSPROP_ENUMERATE))
             return false;
     }
     return true;
 }
 JS_PUBLIC_API(JSFunction *)
 JS::CompileFunction(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options,
                     const char *name, unsigned nargs, const char *const *argnames,
                     const jschar *chars, size_t length)
 {
     RootedFunction fun(cx);
     SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::NoOwnership);
     if (!JS::CompileFunction(cx, obj, options, name, nargs, argnames, srcBuf, &fun))
         return nullptr;
     return fun;
 }
 JS_PUBLIC_API(JSFunction *)
 JS::CompileFunction(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options,
                     const char *name, unsigned nargs, const char *const *argnames,
                     const char *bytes, size_t length)
 {
     jschar *chars;
     if (options.utf8)
         chars = UTF8CharsToNewTwoByteCharsZ(cx, UTF8Chars(bytes, length), &length).get();
     else
         chars = InflateString(cx, bytes, &length);
     if (!chars)
         return nullptr;
     JSFunction *fun = CompileFunction(cx, obj, options, name, nargs, argnames, chars, length);
     js_free(chars);
     return fun;
 }
 JS_PUBLIC_API(JSFunction *)
 JS_CompileUCFunction(JSContext *cx, JS::HandleObject obj, const char *name,
                      unsigned nargs, const char *const *argnames,
                      const jschar *chars, size_t length,
                      const CompileOptions &options)
 {
     return CompileFunction(cx, obj, options, name, nargs, argnames, chars, length);
 }
 JS_PUBLIC_API(JSFunction *)
 JS_CompileFunction(JSContext *cx, JS::HandleObject obj, const char *name,
                    unsigned nargs, const char *const *argnames,
                    const char *ascii, size_t length,
                    const JS::CompileOptions &options)
 {
     return CompileFunction(cx, obj, options, name, nargs, argnames, ascii, length);
 }
 JS_PUBLIC_API(JSString *)
 JS_DecompileScript(JSContext *cx, HandleScript script, const char *name, unsigned indent)
 {
     JS_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) : js_NewStringCopyZ<CanGC>(cx, "[no source]");
 }
 JS_PUBLIC_API(JSString *)
 JS_DecompileFunction(JSContext *cx, HandleFunction fun, unsigned indent)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, fun);
     return FunctionToString(cx, fun, false, !(indent & JS_DONT_PRETTY_PRINT));
 }
 JS_PUBLIC_API(JSString *)
 JS_DecompileFunctionBody(JSContext *cx, HandleFunction fun, unsigned indent)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, fun);
     return FunctionToString(cx, fun, true, !(indent & JS_DONT_PRETTY_PRINT));
 }
 MOZ_NEVER_INLINE static bool
 ExecuteScript(JSContext *cx, HandleObject obj, HandleScript scriptArg, jsval *rval)
 {
     RootedScript script(cx, scriptArg);
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, scriptArg);
     AutoLastFrameCheck lfc(cx);
     return Execute(cx, script, *obj, rval);
 }
 MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
 JS_ExecuteScript(JSContext *cx, HandleObject obj, HandleScript scriptArg, MutableHandleValue rval)
 {
     return ExecuteScript(cx, obj, scriptArg, rval.address());
 }
 MOZ_NEVER_INLINE JS_PUBLIC_API(bool)
 JS_ExecuteScript(JSContext *cx, HandleObject obj, HandleScript scriptArg)
 {
     return ExecuteScript(cx, obj, scriptArg, nullptr);
 }
 JS_PUBLIC_API(bool)
 JS::CloneAndExecuteScript(JSContext *cx, HandleObject obj, HandleScript scriptArg)
 {
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     RootedScript script(cx, scriptArg);
     if (script->compartment() != cx->compartment()) {
         script = CloneScript(cx, NullPtr(), NullPtr(), script);
         if (!script)
             return false;
     }
     return ExecuteScript(cx, obj, script, nullptr);
 }
 JS_PUBLIC_API(bool)
 JS_ExecuteScriptVersion(JSContext *cx, HandleObject obj, HandleScript script,
                         MutableHandleValue rval, JSVersion version)
 {
     return ExecuteScript(cx, obj, script, rval.address());
 }
 JS_PUBLIC_API(bool)
 JS_ExecuteScriptVersion(JSContext *cx, HandleObject obj, HandleScript script, JSVersion version)
 {
     return ExecuteScript(cx, obj, script, nullptr);
 }
 static const unsigned LARGE_SCRIPT_LENGTH = 500*1024;
 static bool
 Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg,
          SourceBufferHolder &srcBuf, JS::Value *rval)
 {
     CompileOptions options(cx, optionsArg);
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     AutoLastFrameCheck lfc(cx);
     options.setCompileAndGo(obj->is<GlobalObject>());
     options.setNoScriptRval(!rval);
     SourceCompressionTask sct(cx);
     RootedScript script(cx, frontend::CompileScript(cx, &cx->tempLifoAlloc(),
                                                     obj, NullPtr(), options,
                                                     srcBuf, nullptr, 0, &sct));
     if (!script)
         return false;
     JS_ASSERT(script->getVersion() == options.version);
     bool result = Execute(cx, script, *obj, rval);
     if (!sct.complete())
         result = false;
     // After evaluation, the compiled script will not be run again.
     // script->ensureRanAnalysis allocated 1 analyze::Bytecode for every opcode
     // which for large scripts means significant memory. Perform a GC eagerly
     // to clear out this analysis data before anything happens to inhibit the
     // flushing of this memory (such as setting requestAnimationFrame).
     if (script->length() > LARGE_SCRIPT_LENGTH) {
         script = nullptr;
         PrepareZoneForGC(cx->zone());
         GC(cx->runtime(), GC_NORMAL, JS::gcreason::FINISH_LARGE_EVALUTE);
     }
     return result;
 }
 static bool
 Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg,
          const jschar *chars, size_t length, JS::Value *rval)
 {
   SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::NoOwnership);
   return ::Evaluate(cx, obj, optionsArg, srcBuf, rval);
 }
 static bool
 Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options,
          const char *bytes, size_t length, JS::Value *rval)
 {
     jschar *chars;
     if (options.utf8)
         chars = UTF8CharsToNewTwoByteCharsZ(cx, JS::UTF8Chars(bytes, length), &length).get();
     else
         chars = InflateString(cx, bytes, &length);
     if (!chars)
         return false;
     SourceBufferHolder srcBuf(chars, length, SourceBufferHolder::GiveOwnership);
     bool ok = ::Evaluate(cx, obj, options, srcBuf, rval);
     return ok;
 }
 static bool
 Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg,
          const char *filename, JS::Value *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, obj, options, buffer.begin(), buffer.length(), rval);
 }
 extern JS_PUBLIC_API(bool)
 JS::Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg,
              SourceBufferHolder &srcBuf, MutableHandleValue rval)
 {
     return ::Evaluate(cx, obj, optionsArg, srcBuf, rval.address());
 }
 extern JS_PUBLIC_API(bool)
 JS::Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg,
              const jschar *chars, size_t length, MutableHandleValue rval)
 {
     return ::Evaluate(cx, obj, optionsArg, chars, length, rval.address());
 }
 extern JS_PUBLIC_API(bool)
 JS::Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options,
              const char *bytes, size_t length, MutableHandleValue rval)
 {
     return ::Evaluate(cx, obj, options, bytes, length, rval.address());
 }
 extern JS_PUBLIC_API(bool)
 JS::Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg,
              const char *filename, MutableHandleValue rval)
 {
     return ::Evaluate(cx, obj, optionsArg, filename, rval.address());
 }
 extern JS_PUBLIC_API(bool)
 JS::Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg,
              SourceBufferHolder &srcBuf)
 {
     return ::Evaluate(cx, obj, optionsArg, srcBuf, nullptr);
 }
 extern JS_PUBLIC_API(bool)
 JS::Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg,
              const jschar *chars, size_t length)
 {
     return ::Evaluate(cx, obj, optionsArg, chars, length, nullptr);
 }
 extern JS_PUBLIC_API(bool)
 JS::Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &options,
              const char *bytes, size_t length)
 {
     return ::Evaluate(cx, obj, options, bytes, length, nullptr);
 }
 extern JS_PUBLIC_API(bool)
 JS::Evaluate(JSContext *cx, HandleObject obj, const ReadOnlyCompileOptions &optionsArg,
              const char *filename)
 {
     return ::Evaluate(cx, obj, optionsArg, filename, nullptr);
 }
 JS_PUBLIC_API(bool)
 JS_EvaluateUCScript(JSContext *cx, HandleObject obj, const jschar *chars, unsigned length,
                     const char *filename, unsigned lineno, MutableHandleValue rval)
 {
     CompileOptions options(cx);
     options.setFileAndLine(filename, lineno);
     return ::Evaluate(cx, obj, options, chars, length, rval.address());
 }
 JS_PUBLIC_API(bool)
 JS_EvaluateUCScript(JSContext *cx, HandleObject obj, SourceBufferHolder &srcBuf,
                     const char *filename, unsigned lineno, MutableHandleValue rval)
 {
     CompileOptions options(cx);
     options.setFileAndLine(filename, lineno);
     return ::Evaluate(cx, obj, options, srcBuf, rval.address());
 }
 JS_PUBLIC_API(bool)
 JS_EvaluateScript(JSContext *cx, HandleObject obj, const char *bytes, unsigned nbytes,
                   const char *filename, unsigned lineno, MutableHandleValue rval)
 {
     CompileOptions options(cx);
     options.setFileAndLine(filename, lineno);
     return ::Evaluate(cx, obj, options, bytes, nbytes, rval.address());
 }
 JS_PUBLIC_API(bool)
 JS_EvaluateScript(JSContext *cx, HandleObject obj, const char *bytes, unsigned nbytes,
                   const char *filename, unsigned lineno)
 {
     CompileOptions options(cx);
     options.setFileAndLine(filename, lineno);
     return ::Evaluate(cx, obj, options, bytes, nbytes, nullptr);
 }
 JS_PUBLIC_API(bool)
 JS_CallFunction(JSContext *cx, HandleObject obj, HandleFunction fun, const HandleValueArray& args,
                 MutableHandleValue rval)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, fun, args);
     AutoLastFrameCheck lfc(cx);
     return Invoke(cx, ObjectOrNullValue(obj), ObjectValue(*fun), args.length(), args.begin(), rval);
 }
 JS_PUBLIC_API(bool)
 JS_CallFunctionName(JSContext *cx, HandleObject obj, const char *name, const HandleValueArray& args,
                     MutableHandleValue rval)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, args);
     AutoLastFrameCheck lfc(cx);
     JSAtom *atom = Atomize(cx, name, strlen(name));
     if (!atom)
         return false;
     RootedValue v(cx);
     RootedId id(cx, AtomToId(atom));
     if (!JSObject::getGeneric(cx, obj, obj, id, &v))
         return false;
     return Invoke(cx, ObjectOrNullValue(obj), v, args.length(), args.begin(), rval);
 }
 JS_PUBLIC_API(bool)
 JS_CallFunctionValue(JSContext *cx, HandleObject obj, HandleValue fval, const HandleValueArray& args,
                      MutableHandleValue rval)
 {
     JS_ASSERT(!cx->runtime()->isAtomsCompartment(cx->compartment()));
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj, fval, args);
     AutoLastFrameCheck lfc(cx);
     return Invoke(cx, ObjectOrNullValue(obj), fval, args.length(), args.begin(), rval);
 }
 JS_PUBLIC_API(bool)
 JS::Call(JSContext *cx, HandleValue thisv, HandleValue fval, const JS::HandleValueArray& args,
          MutableHandleValue rval)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, thisv, fval, args);
     AutoLastFrameCheck lfc(cx);
     return Invoke(cx, thisv, fval, args.length(), args.begin(), rval);
 }
 static JSObject *
 JS_NewHelper(JSContext *cx, HandleObject ctor, const JS::HandleValueArray& inputArgs)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, ctor, inputArgs);
     // This is not a simple variation of JS_CallFunctionValue because JSOP_NEW
     // is not a simple variation of JSOP_CALL. We have to determine what class
     // of object to create, create it, and clamp the return value to an object,
     // among other details. InvokeConstructor does the hard work.
     InvokeArgs args(cx);
     if (!args.init(inputArgs.length()))
         return nullptr;
     args.setCallee(ObjectValue(*ctor));
     args.setThis(NullValue());
     PodCopy(args.array(), inputArgs.begin(), inputArgs.length());
     if (!InvokeConstructor(cx, args))
         return nullptr;
     if (!args.rval().isObject()) {
         /*
          * Although constructors may return primitives (via proxies), this
          * API is asking for an object, so we report an error.
          */
         JSAutoByteString bytes;
         if (js_ValueToPrintable(cx, args.rval(), &bytes)) {
             JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BAD_NEW_RESULT,
                                  bytes.ptr());
         }
         return nullptr;
     }
     return &args.rval().toObject();
 }
 JS_PUBLIC_API(JSObject *)
 JS_New(JSContext *cx, HandleObject ctor, const JS::HandleValueArray& inputArgs)
 {
     RootedObject obj(cx);
     {
         AutoLastFrameCheck lfc(cx);
         obj = JS_NewHelper(cx, ctor, inputArgs);
     }
     return obj;
 }
 JS_PUBLIC_API(JSInterruptCallback)
 JS_SetInterruptCallback(JSRuntime *rt, JSInterruptCallback callback)
 {
     JSInterruptCallback old = rt->interruptCallback;
     rt->interruptCallback = callback;
     return old;
 }
 JS_PUBLIC_API(JSInterruptCallback)
 JS_GetInterruptCallback(JSRuntime *rt)
 {
     return rt->interruptCallback;
 }
 JS_PUBLIC_API(void)
 JS_RequestInterruptCallback(JSRuntime *rt)
 {
     rt->requestInterrupt(JSRuntime::RequestInterruptAnyThread);
 }
 JS_PUBLIC_API(bool)
 JS_IsRunning(JSContext *cx)
 {
     return cx->currentlyRunning();
 }
 JS_PUBLIC_API(bool)
 JS_SaveFrameChain(JSContext *cx)
 {
     AssertHeapIsIdleOrIterating(cx);
     CHECK_REQUEST(cx);
     return cx->saveFrameChain();
 }
 JS_PUBLIC_API(void)
 JS_RestoreFrameChain(JSContext *cx)
 {
     AssertHeapIsIdleOrIterating(cx);
     CHECK_REQUEST(cx);
     cx->restoreFrameChain();
 }
 #ifdef MOZ_TRACE_JSCALLS
 JS_PUBLIC_API(void)
 JS_SetFunctionCallback(JSContext *cx, JSFunctionCallback fcb)
 {
     cx->functionCallback = fcb;
 }
 JS_PUBLIC_API(JSFunctionCallback)
 JS_GetFunctionCallback(JSContext *cx)
 {
     return cx->functionCallback;
 }
 #endif
 /************************************************************************/
 JS_PUBLIC_API(JSString *)
 JS_NewStringCopyN(JSContext *cx, const char *s, size_t n)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (!n)
         return cx->names().empty;
     return js_NewStringCopyN<CanGC>(cx, s, n);
 }
 JS_PUBLIC_API(JSString *)
 JS_NewStringCopyZ(JSContext *cx, const char *s)
 {
     size_t n;
     jschar *js;
     JSString *str;
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (!s || !*s)
         return cx->runtime()->emptyString;
     n = strlen(s);
     js = InflateString(cx, s, &n);
     if (!js)
         return nullptr;
     str = js_NewString<CanGC>(cx, js, n);
     if (!str)
         js_free(js);
     return str;
 }
 JS_PUBLIC_API(bool)
 JS_StringHasBeenInterned(JSContext *cx, JSString *str)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (!str->isAtom())
         return false;
     return AtomIsInterned(cx, &str->asAtom());
 }
 JS_PUBLIC_API(jsid)
 INTERNED_STRING_TO_JSID(JSContext *cx, JSString *str)
 {
     JS_ASSERT(str);
     JS_ASSERT(((size_t)str & JSID_TYPE_MASK) == 0);
     JS_ASSERT_IF(cx, JS_StringHasBeenInterned(cx, str));
     return AtomToId(&str->asAtom());
 }
 JS_PUBLIC_API(JSString *)
 JS_InternJSString(JSContext *cx, HandleString str)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JSAtom *atom = AtomizeString(cx, str, InternAtom);
     JS_ASSERT_IF(atom, JS_StringHasBeenInterned(cx, atom));
     return atom;
 }
 JS_PUBLIC_API(JSString *)
 JS_InternString(JSContext *cx, const char *s)
 {
     return JS_InternStringN(cx, s, strlen(s));
 }
 JS_PUBLIC_API(JSString *)
 JS_InternStringN(JSContext *cx, const char *s, size_t length)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JSAtom *atom = Atomize(cx, s, length, InternAtom);
     JS_ASSERT_IF(atom, JS_StringHasBeenInterned(cx, atom));
     return atom;
 }
 JS_PUBLIC_API(JSString *)
 JS_NewUCString(JSContext *cx, jschar *chars, size_t length)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return js_NewString<CanGC>(cx, chars, length);
 }
 JS_PUBLIC_API(JSString *)
 JS_NewUCStringCopyN(JSContext *cx, const jschar *s, size_t n)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (!n)
         return cx->names().empty;
     return js_NewStringCopyN<CanGC>(cx, s, n);
 }
 JS_PUBLIC_API(JSString *)
 JS_NewUCStringCopyZ(JSContext *cx, const jschar *s)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (!s)
         return cx->runtime()->emptyString;
     return js_NewStringCopyZ<CanGC>(cx, s);
 }
 JS_PUBLIC_API(JSString *)
 JS_InternUCStringN(JSContext *cx, const jschar *s, size_t length)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JSAtom *atom = AtomizeChars(cx, s, length, InternAtom);
     JS_ASSERT_IF(atom, JS_StringHasBeenInterned(cx, atom));
     return atom;
 }
 JS_PUBLIC_API(JSString *)
 JS_InternUCString(JSContext *cx, const jschar *s)
 {
     return JS_InternUCStringN(cx, s, js_strlen(s));
 }
 JS_PUBLIC_API(size_t)
 JS_GetStringLength(JSString *str)
 {
     return str->length();
 }
 JS_PUBLIC_API(const jschar *)
 JS_GetStringCharsZ(JSContext *cx, JSString *str)
 {
     size_t dummy;
     return JS_GetStringCharsZAndLength(cx, str, &dummy);
 }
 JS_PUBLIC_API(const jschar *)
 JS_GetStringCharsZAndLength(JSContext *cx, JSString *str, size_t *plength)
 {
     /*
      * Don't require |cx->compartment()| to be |str|'s compartment. We don't need
      * it, and it's annoying for callers.
      */
     JS_ASSERT(plength);
     AssertHeapIsIdleOrStringIsFlat(cx, str);
     CHECK_REQUEST(cx);
     JSFlatString *flat = str->ensureFlat(cx);
     if (!flat)
         return nullptr;
     *plength = flat->length();
     return flat->chars();
 }
 JS_PUBLIC_API(const jschar *)
 JS_GetStringCharsAndLength(JSContext *cx, JSString *str, size_t *plength)
 {
     JS_ASSERT(plength);
     AssertHeapIsIdleOrStringIsFlat(cx, str);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, str);
     JSLinearString *linear = str->ensureLinear(cx);
     if (!linear)
         return nullptr;
     *plength = linear->length();
     return linear->chars();
 }
 JS_PUBLIC_API(const jschar *)
 JS_GetInternedStringChars(JSString *str)
 {
     JS_ASSERT(str->isAtom());
     JSFlatString *flat = str->ensureFlat(nullptr);
     if (!flat)
         return nullptr;
     return flat->chars();
 }
 JS_PUBLIC_API(const jschar *)
 JS_GetInternedStringCharsAndLength(JSString *str, size_t *plength)
 {
     JS_ASSERT(str->isAtom());
     JS_ASSERT(plength);
     JSFlatString *flat = str->ensureFlat(nullptr);
     if (!flat)
         return nullptr;
     *plength = flat->length();
     return flat->chars();
 }
 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 jschar *)
 JS_GetFlatStringChars(JSFlatString *str)
 {
     return str->chars();
 }
 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 js_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, jschar *dst, size_t *dstlenp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (!dst) {
         *dstlenp = srclen;
         return true;
     }
     size_t dstlen = *dstlenp;
     if (srclen > dstlen) {
         InflateStringToBuffer(src, dstlen, dst);
         AutoSuppressGC suppress(cx);
         JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_BUFFER_TOO_SMALL);
         return false;
     }
     InflateStringToBuffer(src, srclen, dst);
     *dstlenp = srclen;
     return true;
 }
 JS_PUBLIC_API(char *)
 JS_EncodeString(JSContext *cx, JSString *str)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JSLinearString *linear = str->ensureLinear(cx);
     if (!linear)
         return nullptr;
     return LossyTwoByteCharsToNewLatin1CharsZ(cx, linear->range()).c_str();
 }
 JS_PUBLIC_API(char *)
 JS_EncodeStringToUTF8(JSContext *cx, HandleString str)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JSLinearString *linear = str->ensureLinear(cx);
     if (!linear)
         return nullptr;
     return TwoByteCharsToNewUTF8CharsZ(cx, linear->range()).c_str();
 }
 JS_PUBLIC_API(size_t)
 JS_GetStringEncodingLength(JSContext *cx, JSString *str)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     const jschar *chars = str->getChars(cx);
     if (!chars)
         return size_t(-1);
     return str->length();
 }
 JS_PUBLIC_API(size_t)
 JS_EncodeStringToBuffer(JSContext *cx, JSString *str, char *buffer, size_t length)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     /*
      * FIXME bug 612141 - fix DeflateStringToBuffer interface so the result
      * would allow to distinguish between insufficient buffer and encoding
      * error.
      */
     size_t writtenLength = length;
     const jschar *chars = str->getChars(nullptr);
     if (!chars)
         return size_t(-1);
     if (DeflateStringToBuffer(nullptr, chars, str->length(), buffer, &writtenLength)) {
         JS_ASSERT(writtenLength <= length);
         return writtenLength;
     }
     JS_ASSERT(writtenLength <= length);
     size_t necessaryLength = str->length();
     if (necessaryLength == size_t(-1))
         return size_t(-1);
     JS_ASSERT(writtenLength == length); // C strings are NOT encoded.
     return necessaryLength;
 }
 JS_PUBLIC_API(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 (!js_Stringify(cx, vp, replacer, space, sb))
         return false;
     if (sb.empty()) {
         HandlePropertyName null = cx->names().null;
         return callback(null->chars(), null->length(), data);
     }
     return callback(sb.begin(), sb.length(), data);
 }
 JS_PUBLIC_API(bool)
 JS_ParseJSON(JSContext *cx, const jschar *chars, uint32_t len, JS::MutableHandleValue vp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     RootedValue reviver(cx, NullValue());
     return ParseJSONWithReviver(cx, ConstTwoByteChars(chars, len), len, reviver, vp);
 }
 JS_PUBLIC_API(bool)
 JS_ParseJSONWithReviver(JSContext *cx, const jschar *chars, uint32_t len, HandleValue reviver, MutableHandleValue vp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return ParseJSONWithReviver(cx, ConstTwoByteChars(chars, len), len, reviver, vp);
 }
 /************************************************************************/
 JS_PUBLIC_API(void)
 JS_ReportError(JSContext *cx, const char *format, ...)
 {
     va_list ap;
     AssertHeapIsIdle(cx);
     va_start(ap, format);
     js_ReportErrorVA(cx, JSREPORT_ERROR, format, ap);
     va_end(ap);
 }
 JS_PUBLIC_API(void)
 JS_ReportErrorNumber(JSContext *cx, JSErrorCallback errorCallback,
                      void *userRef, const unsigned errorNumber, ...)
 {
     va_list ap;
     va_start(ap, errorNumber);
     JS_ReportErrorNumberVA(cx, errorCallback, userRef, errorNumber, ap);
     va_end(ap);
 }
 JS_PUBLIC_API(void)
 JS_ReportErrorNumberVA(JSContext *cx, JSErrorCallback errorCallback,
                        void *userRef, const unsigned errorNumber,
                        va_list ap)
 {
     AssertHeapIsIdle(cx);
     js_ReportErrorNumberVA(cx, JSREPORT_ERROR, errorCallback, userRef,
                            errorNumber, ArgumentsAreASCII, ap);
 }
 JS_PUBLIC_API(void)
 JS_ReportErrorNumberUC(JSContext *cx, JSErrorCallback errorCallback,
                        void *userRef, const unsigned errorNumber, ...)
 {
     va_list ap;
     AssertHeapIsIdle(cx);
     va_start(ap, errorNumber);
     js_ReportErrorNumberVA(cx, JSREPORT_ERROR, errorCallback, userRef,
                            errorNumber, ArgumentsAreUnicode, ap);
     va_end(ap);
 }
 JS_PUBLIC_API(void)
 JS_ReportErrorNumberUCArray(JSContext *cx, JSErrorCallback errorCallback,
                             void *userRef, const unsigned errorNumber,
                             const jschar **args)
 {
     AssertHeapIsIdle(cx);
     js_ReportErrorNumberUCArray(cx, JSREPORT_ERROR, errorCallback, userRef,
                                 errorNumber, args);
 }
 JS_PUBLIC_API(bool)
 JS_ReportWarning(JSContext *cx, const char *format, ...)
 {
     va_list ap;
     bool ok;
     AssertHeapIsIdle(cx);
     va_start(ap, format);
     ok = js_ReportErrorVA(cx, JSREPORT_WARNING, format, ap);
     va_end(ap);
     return ok;
 }
 JS_PUBLIC_API(bool)
 JS_ReportErrorFlagsAndNumber(JSContext *cx, unsigned flags,
                              JSErrorCallback errorCallback, void *userRef,
                              const unsigned errorNumber, ...)
 {
     va_list ap;
     bool ok;
     AssertHeapIsIdle(cx);
     va_start(ap, errorNumber);
     ok = js_ReportErrorNumberVA(cx, flags, errorCallback, userRef,
                                 errorNumber, ArgumentsAreASCII, ap);
     va_end(ap);
     return ok;
 }
 JS_PUBLIC_API(bool)
 JS_ReportErrorFlagsAndNumberUC(JSContext *cx, unsigned flags,
                                JSErrorCallback errorCallback, void *userRef,
                                const unsigned errorNumber, ...)
 {
     va_list ap;
     bool ok;
     AssertHeapIsIdle(cx);
     va_start(ap, errorNumber);
     ok = js_ReportErrorNumberVA(cx, flags, errorCallback, userRef,
                                 errorNumber, ArgumentsAreUnicode, ap);
     va_end(ap);
     return ok;
 }
 JS_PUBLIC_API(void)
 JS_ReportOutOfMemory(JSContext *cx)
 {
     js_ReportOutOfMemory(cx);
 }
 JS_PUBLIC_API(void)
 JS_ReportAllocationOverflow(JSContext *cx)
 {
     js_ReportAllocationOverflow(cx);
 }
 JS_PUBLIC_API(JSErrorReporter)
 JS_GetErrorReporter(JSContext *cx)
 {
     return cx->errorReporter;
 }
 JS_PUBLIC_API(JSErrorReporter)
 JS_SetErrorReporter(JSContext *cx, JSErrorReporter er)
 {
     JSErrorReporter older;
     older = cx->errorReporter;
     cx->errorReporter = er;
     return older;
 }
 /************************************************************************/
 /*
  * Dates.
  */
 JS_PUBLIC_API(JSObject *)
 JS_NewDateObject(JSContext *cx, int year, int mon, int mday, int hour, int min, int sec)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return js_NewDateObject(cx, year, mon, mday, hour, min, sec);
 }
 JS_PUBLIC_API(JSObject *)
 JS_NewDateObjectMsec(JSContext *cx, double msec)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return js_NewDateObjectMsec(cx, msec);
 }
 JS_PUBLIC_API(bool)
 JS_ObjectIsDate(JSContext *cx, HandleObject obj)
 {
     assertSameCompartment(cx, obj);
     return ObjectClassIs(obj, ESClass_Date, cx);
 }
 JS_PUBLIC_API(void)
 JS_ClearDateCaches(JSContext *cx)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     cx->runtime()->dateTimeInfo.updateTimeZoneAdjustment();
 }
 /************************************************************************/
 /*
  * Regular Expressions.
  */
 JS_PUBLIC_API(JSObject *)
 JS_NewRegExpObject(JSContext *cx, HandleObject obj, char *bytes, size_t length, unsigned flags)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     jschar *chars = InflateString(cx, bytes, &length);
     if (!chars)
         return nullptr;
     RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics();
     RegExpObject *reobj = RegExpObject::create(cx, res, chars, length,
                                                RegExpFlag(flags), nullptr);
     js_free(chars);
     return reobj;
 }
 JS_PUBLIC_API(JSObject *)
 JS_NewUCRegExpObject(JSContext *cx, HandleObject obj, jschar *chars, size_t length,
                      unsigned flags)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics();
     return RegExpObject::create(cx, res, chars, length,
                                 RegExpFlag(flags), nullptr);
 }
 JS_PUBLIC_API(void)
 JS_SetRegExpInput(JSContext *cx, HandleObject obj, HandleString input, bool multiline)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, input);
     obj->as<GlobalObject>().getRegExpStatics()->reset(cx, input, !!multiline);
 }
 JS_PUBLIC_API(void)
 JS_ClearRegExpStatics(JSContext *cx, HandleObject obj)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     JS_ASSERT(obj);
     obj->as<GlobalObject>().getRegExpStatics()->clear();
 }
 JS_PUBLIC_API(bool)
 JS_ExecuteRegExp(JSContext *cx, HandleObject obj, HandleObject reobj, jschar *chars,
                  size_t length, size_t *indexp, bool test, MutableHandleValue rval)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     RegExpStatics *res = obj->as<GlobalObject>().getRegExpStatics();
     return ExecuteRegExpLegacy(cx, res, reobj->as<RegExpObject>(), NullPtr(), chars, length, indexp,
                                test, rval);
 }
 JS_PUBLIC_API(JSObject *)
 JS_NewRegExpObjectNoStatics(JSContext *cx, char *bytes, size_t length, unsigned flags)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     jschar *chars = InflateString(cx, bytes, &length);
     if (!chars)
         return nullptr;
     RegExpObject *reobj = RegExpObject::createNoStatics(cx, chars, length,
                                                         RegExpFlag(flags), nullptr);
     js_free(chars);
     return reobj;
 }
 JS_PUBLIC_API(JSObject *)
 JS_NewUCRegExpObjectNoStatics(JSContext *cx, jschar *chars, size_t length, unsigned flags)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return RegExpObject::createNoStatics(cx, chars, length,
                                          RegExpFlag(flags), nullptr);
 }
 JS_PUBLIC_API(bool)
 JS_ExecuteRegExpNoStatics(JSContext *cx, HandleObject obj, jschar *chars, size_t length,
                           size_t *indexp, bool test, MutableHandleValue rval)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return ExecuteRegExpLegacy(cx, nullptr, obj->as<RegExpObject>(), NullPtr(), chars, length,
                                indexp, test, rval);
 }
 JS_PUBLIC_API(bool)
 JS_ObjectIsRegExp(JSContext *cx, HandleObject obj)
 {
     assertSameCompartment(cx, obj);
     return ObjectClassIs(obj, ESClass_RegExp, cx);
 }
 JS_PUBLIC_API(unsigned)
 JS_GetRegExpFlags(JSContext *cx, HandleObject obj)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return obj->as<RegExpObject>().getFlags();
 }
 JS_PUBLIC_API(JSString *)
 JS_GetRegExpSource(JSContext *cx, HandleObject obj)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     return obj->as<RegExpObject>().getSource();
 }
 /************************************************************************/
 JS_PUBLIC_API(bool)
 JS_SetDefaultLocale(JSRuntime *rt, const char *locale)
 {
     AssertHeapIsIdle(rt);
     return rt->setDefaultLocale(locale);
 }
 JS_PUBLIC_API(const char*)
 JS_GetDefaultLocale(JSRuntime *rt)
 {
     AssertHeapIsIdle(rt);
     return rt->getDefaultLocale();
 }
 JS_PUBLIC_API(void)
 JS_ResetDefaultLocale(JSRuntime *rt)
 {
     AssertHeapIsIdle(rt);
     rt->resetDefaultLocale();
 }
 JS_PUBLIC_API(void)
 JS_SetLocaleCallbacks(JSRuntime *rt, JSLocaleCallbacks *callbacks)
 {
     AssertHeapIsIdle(rt);
     rt->localeCallbacks = callbacks;
 }
 JS_PUBLIC_API(JSLocaleCallbacks *)
 JS_GetLocaleCallbacks(JSRuntime *rt)
 {
     /* This function can be called by a finalizer. */
     return rt->localeCallbacks;
 }
 /************************************************************************/
 JS_PUBLIC_API(bool)
 JS_IsExceptionPending(JSContext *cx)
 {
     /* This function can be called by a finalizer. */
     return (bool) cx->isExceptionPending();
 }
 JS_PUBLIC_API(bool)
 JS_GetPendingException(JSContext *cx, MutableHandleValue vp)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (!cx->isExceptionPending())
         return false;
     return cx->getPendingException(vp);
 }
 JS_PUBLIC_API(void)
 JS_SetPendingException(JSContext *cx, HandleValue value)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, value);
     cx->setPendingException(value);
 }
 JS_PUBLIC_API(void)
 JS_ClearPendingException(JSContext *cx)
 {
     AssertHeapIsIdle(cx);
     cx->clearPendingException();
 }
 JS_PUBLIC_API(bool)
 JS_ReportPendingException(JSContext *cx)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     // This can only fail due to oom.
     bool ok = js_ReportUncaughtException(cx);
     JS_ASSERT(!cx->isExceptionPending());
     return ok;
 }
 JS::AutoSaveExceptionState::AutoSaveExceptionState(JSContext *cx)
     : context(cx), wasThrowing(cx->throwing), exceptionValue(cx)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (wasThrowing) {
         exceptionValue = cx->unwrappedException_;
         cx->clearPendingException();
     }
 }
 void
 JS::AutoSaveExceptionState::restore()
 {
     context->throwing = wasThrowing;
     context->unwrappedException_ = exceptionValue;
     drop();
 }
 JS::AutoSaveExceptionState::~AutoSaveExceptionState()
 {
     if (wasThrowing && !context->isExceptionPending()) {
         context->throwing = true;
         context->unwrappedException_ = exceptionValue;
     }
 }
 struct JSExceptionState {
     bool throwing;
     jsval exception;
 };
 JS_PUBLIC_API(JSExceptionState *)
 JS_SaveExceptionState(JSContext *cx)
 {
     JSExceptionState *state;
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     state = cx->pod_malloc<JSExceptionState>();
     if (state) {
         state->throwing =
             JS_GetPendingException(cx, MutableHandleValue::fromMarkedLocation(&state->exception));
         if (state->throwing && JSVAL_IS_GCTHING(state->exception))
             AddValueRoot(cx, &state->exception, "JSExceptionState.exception");
     }
     return state;
 }
 JS_PUBLIC_API(void)
 JS_RestoreExceptionState(JSContext *cx, JSExceptionState *state)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (state) {
         if (state->throwing)
             JS_SetPendingException(cx, HandleValue::fromMarkedLocation(&state->exception));
         else
             JS_ClearPendingException(cx);
         JS_DropExceptionState(cx, state);
     }
 }
 JS_PUBLIC_API(void)
 JS_DropExceptionState(JSContext *cx, JSExceptionState *state)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     if (state) {
         if (state->throwing && JSVAL_IS_GCTHING(state->exception)) {
             assertSameCompartment(cx, state->exception);
             RemoveRoot(cx->runtime(), &state->exception);
         }
         js_free(state);
     }
 }
 JS_PUBLIC_API(JSErrorReport *)
 JS_ErrorFromException(JSContext *cx, HandleObject obj)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, obj);
     return js_ErrorFromException(cx, obj);
 }
 JS_PUBLIC_API(bool)
 JS_ThrowStopIteration(JSContext *cx)
 {
     AssertHeapIsIdle(cx);
     return js_ThrowStopIteration(cx);
 }
 JS_PUBLIC_API(bool)
 JS_IsStopIteration(jsval v)
 {
     return v.isObject() && v.toObject().is<StopIterationObject>();
 }
 JS_PUBLIC_API(intptr_t)
 JS_GetCurrentThread()
 {
 #ifdef JS_THREADSAFE
     return reinterpret_cast<intptr_t>(PR_GetCurrentThread());
 #else
     return 0;
 #endif
 }
 extern MOZ_NEVER_INLINE JS_PUBLIC_API(void)
 JS_AbortIfWrongThread(JSRuntime *rt)
 {
     if (!CurrentThreadCanAccessRuntime(rt))
         MOZ_CRASH();
     if (!js::TlsPerThreadData.get()->associatedWith(rt))
         MOZ_CRASH();
 }
 #ifdef JS_GC_ZEAL
 JS_PUBLIC_API(void)
 JS_SetGCZeal(JSContext *cx, uint8_t zeal, uint32_t frequency)
 {
     SetGCZeal(cx->runtime(), zeal, frequency);
 }
 JS_PUBLIC_API(void)
 JS_ScheduleGC(JSContext *cx, uint32_t count)
 {
     cx->runtime()->gcNextScheduled = count;
 }
 #endif
 JS_PUBLIC_API(void)
 JS_SetParallelParsingEnabled(JSRuntime *rt, bool enabled)
 {
 #ifdef JS_ION
     rt->setParallelParsingEnabled(enabled);
 #endif
 }
 JS_PUBLIC_API(void)
 JS_SetParallelIonCompilationEnabled(JSRuntime *rt, bool enabled)
 {
 #ifdef JS_ION
     rt->setParallelIonCompilationEnabled(enabled);
 #endif
 }
 JS_PUBLIC_API(void)
 JS_SetGlobalJitCompilerOption(JSRuntime *rt, JSJitCompilerOption opt, uint32_t value)
 {
 #ifdef JS_ION
     switch (opt) {
       case JSJITCOMPILER_BASELINE_USECOUNT_TRIGGER:
         if (value == uint32_t(-1)) {
             jit::JitOptions defaultValues;
             value = defaultValues.baselineUsesBeforeCompile;
         }
         jit::js_JitOptions.baselineUsesBeforeCompile = value;
         break;
       case JSJITCOMPILER_ION_USECOUNT_TRIGGER:
         if (value == uint32_t(-1)) {
             jit::js_JitOptions.resetUsesBeforeCompile();
             break;
         }
         jit::js_JitOptions.setUsesBeforeCompile(value);
         if (value == 0)
             jit::js_JitOptions.setEagerCompilation();
         break;
       case JSJITCOMPILER_ION_ENABLE:
         if (value == 1) {
             JS::RuntimeOptionsRef(rt).setIon(true);
             IonSpew(js::jit::IonSpew_Scripts, "Enable ion");
         } else if (value == 0) {
             JS::RuntimeOptionsRef(rt).setIon(false);
             IonSpew(js::jit::IonSpew_Scripts, "Disable ion");
         }
         break;
       case JSJITCOMPILER_BASELINE_ENABLE:
         if (value == 1) {
             JS::RuntimeOptionsRef(rt).setBaseline(true);
             IonSpew(js::jit::IonSpew_BaselineScripts, "Enable baseline");
         } else if (value == 0) {
             JS::RuntimeOptionsRef(rt).setBaseline(false);
             IonSpew(js::jit::IonSpew_BaselineScripts, "Disable baseline");
         }
         break;
       case JSJITCOMPILER_PARALLEL_COMPILATION_ENABLE:
         if (value == 1) {
             rt->setParallelIonCompilationEnabled(true);
             IonSpew(js::jit::IonSpew_Scripts, "Enable parallel compilation");
         } else if (value == 0) {
             rt->setParallelIonCompilationEnabled(false);
             IonSpew(js::jit::IonSpew_Scripts, "Disable parallel compilation");
         }
         break;
       default:
         break;
     }
 #endif
 }
 JS_PUBLIC_API(int)
 JS_GetGlobalJitCompilerOption(JSRuntime *rt, JSJitCompilerOption opt)
 {
 #ifdef JS_ION
     switch (opt) {
       case JSJITCOMPILER_BASELINE_USECOUNT_TRIGGER:
         return jit::js_JitOptions.baselineUsesBeforeCompile;
       case JSJITCOMPILER_ION_USECOUNT_TRIGGER:
         return jit::js_JitOptions.forcedDefaultIonUsesBeforeCompile;
       case JSJITCOMPILER_ION_ENABLE:
         return JS::RuntimeOptionsRef(rt).ion();
       case JSJITCOMPILER_BASELINE_ENABLE:
         return JS::RuntimeOptionsRef(rt).baseline();
       case JSJITCOMPILER_PARALLEL_COMPILATION_ENABLE:
         return rt->canUseParallelIonCompilation();
       default:
         break;
     }
 #endif
     return 0;
 }
 /************************************************************************/
 #if !defined(STATIC_EXPORTABLE_JS_API) && !defined(STATIC_JS_API) && defined(XP_WIN)
 #include "jswin.h"
 /*
  * Initialization routine for the JS DLL.
  */
 BOOL WINAPI DllMain (HINSTANCE hDLL, 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.start().get(), chars.length()));
     if (!atom)
         return false;
 #ifdef DEBUG
     uint32_t dummy;
     MOZ_ASSERT(!atom->isIndex(&dummy), "API misuse: |chars| must not encode an index");
 #endif
     idp.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;
 }
 namespace JS {
 void
 AutoFilename::reset(void *newScriptSource)
 {
     if (newScriptSource)
         reinterpret_cast<ScriptSource*>(newScriptSource)->incref();
     if (scriptSource_)
         reinterpret_cast<ScriptSource*>(scriptSource_)->decref();
     scriptSource_ = newScriptSource;
 }
 const char *
 AutoFilename::get() const
 {
     JS_ASSERT(scriptSource_);
     return reinterpret_cast<ScriptSource*>(scriptSource_)->filename();
 }
 JS_PUBLIC_API(bool)
 DescribeScriptedCaller(JSContext *cx, AutoFilename *filename, unsigned *lineno)
 {
     if (lineno)
         *lineno = 0;
     NonBuiltinFrameIter i(cx);
     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)
         filename->reset(i.scriptSource());
     if (lineno)
         *lineno = i.computeLine();
     return true;
 }
 JS_PUBLIC_API(JSObject *)
 GetScriptedCallerGlobal(JSContext *cx)
 {
     NonBuiltinFrameIter i(cx);
     if (i.done())
         return nullptr;
     // If the caller is hidden, the embedding wants us to return null here so
     // that it can check its own stack (see HideScriptedCaller).
     if (i.activation()->scriptedCallerIsHidden())
         return nullptr;
     GlobalObject *global = i.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.
     JS_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()->mainThread.activation();
     if (!act)
         return;
     act->hideScriptedCaller();
 }
 JS_PUBLIC_API(void)
 UnhideScriptedCaller(JSContext *cx)
 {
     Activation *act = cx->runtime()->mainThread.activation();
     if (!act)
         return;
     act->unhideScriptedCaller();
 }
 } /* namespace JS */
 #ifdef JS_THREADSAFE
 static PRStatus
 CallOnce(void *func)
 {
     JSInitCallback init = JS_DATA_TO_FUNC_PTR(JSInitCallback, func);
     return init() ? PR_SUCCESS : PR_FAILURE;
 }
 #endif
 JS_PUBLIC_API(bool)
 JS_CallOnce(JSCallOnceType *once, JSInitCallback func)
 {
 #ifdef JS_THREADSAFE
     return PR_CallOnceWithArg(once, CallOnce, JS_FUNC_TO_DATA_PTR(void *, func)) == PR_SUCCESS;
 #else
     if (!*once) {
         *once = true;
         return func();
     } else {
         return true;
     }
 #endif
 }
 AutoGCRooter::AutoGCRooter(JSContext *cx, ptrdiff_t tag)
   : down(ContextFriendFields::get(cx)->autoGCRooters),
     tag_(tag),
     stackTop(&ContextFriendFields::get(cx)->autoGCRooters)
 {
     JS_ASSERT(this != *stackTop);
     *stackTop = this;
 }
 AutoGCRooter::AutoGCRooter(ContextFriendFields *cx, ptrdiff_t tag)
   : down(cx->autoGCRooters),
     tag_(tag),
     stackTop(&cx->autoGCRooters)
 {
     JS_ASSERT(this != *stackTop);
     *stackTop = this;
 }
 #ifdef DEBUG
 JS_PUBLIC_API(void)
 JS::AssertArgumentsAreSane(JSContext *cx, HandleValue value)
 {
     AssertHeapIsIdle(cx);
     CHECK_REQUEST(cx);
     assertSameCompartment(cx, value);
 }
 #endif /* DEBUG */
 JS_PUBLIC_API(void *)
 JS_EncodeScript(JSContext *cx, HandleScript scriptArg, uint32_t *lengthp)
 {
     XDREncoder encoder(cx);
     RootedScript script(cx, scriptArg);
     if (!encoder.codeScript(&script))
         return nullptr;
     return encoder.forgetData(lengthp);
 }
 JS_PUBLIC_API(void *)
 JS_EncodeInterpretedFunction(JSContext *cx, HandleObject funobjArg, uint32_t *lengthp)
 {
     XDREncoder encoder(cx);
     RootedObject funobj(cx, funobjArg);
     if (!encoder.codeFunction(&funobj))
         return nullptr;
     return encoder.forgetData(lengthp);
 }
 JS_PUBLIC_API(JSScript *)
 JS_DecodeScript(JSContext *cx, const void *data, uint32_t length,
                 JSPrincipals *originPrincipals)
 {
     XDRDecoder decoder(cx, data, length, originPrincipals);
     RootedScript script(cx);
     if (!decoder.codeScript(&script))
         return nullptr;
     return script;
 }
 JS_PUBLIC_API(JSObject *)
 JS_DecodeInterpretedFunction(JSContext *cx, const void *data, uint32_t length,
                              JSPrincipals *originPrincipals)
 {
     XDRDecoder decoder(cx, data, length, originPrincipals);
     RootedObject funobj(cx);
     if (!decoder.codeFunction(&funobj))
         return nullptr;
     return funobj;
 }
 JS_PUBLIC_API(bool)
 JS_PreventExtensions(JSContext *cx, JS::HandleObject obj)
 {
     bool extensible;
     if (!JSObject::isExtensible(cx, obj, &extensible))
         return false;
     if (!extensible)
         return true;
     return JSObject::preventExtensions(cx, obj);
 }
 JS_PUBLIC_API(void)
 JS::SetAsmJSCacheOps(JSRuntime *rt, const JS::AsmJSCacheOps *ops)
 {
     rt->asmJSCacheOps = *ops;
 }
 char *
 JSAutoByteString::encodeLatin1(ExclusiveContext *cx, JSString *str)
 {
     JSLinearString *linear = str->ensureLinear(cx);
     if (!linear)
         return nullptr;
     mBytes = LossyTwoByteCharsToNewLatin1CharsZ(cx, linear->range()).c_str();
     return mBytes;
 }
 JS_PUBLIC_API(void)
 JS::SetLargeAllocationFailureCallback(JSRuntime *rt, JS::LargeAllocationFailureCallback lafc)
 {
     rt->largeAllocationFailureCallback = lafc;
 }
 JS_PUBLIC_API(void)
 JS::SetOutOfMemoryCallback(JSRuntime *rt, OutOfMemoryCallback cb)
 {
     rt->oomCallback = cb;
 }

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js/src/jsapi.cpp@6474c204b198 (annotated)

js/src/jsapi.cpp