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+/* -*- Mode: IDL; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+#include "nsISupports.idl"
+
+%{C++
+#include "jspubtd.h"
+%}
+
+interface xpcIJSWeakReference;
+interface nsIAddonInterposition;
+interface nsIClassInfo;
+interface nsIComponentManager;
+interface nsICycleCollectorListener;
+interface nsIJSCID;
+interface nsIJSIID;
+interface nsIPrincipal;
+interface nsIStackFrame;
+
+/**
+* interface of Components.interfacesByID
+* (interesting stuff only reflected into JavaScript)
+*/
+[scriptable, uuid(f235ef76-9919-478b-aa0f-282d994ddf76)]
+interface nsIXPCComponents_InterfacesByID : nsISupports
+{
+};
+
+/**
+* interface of Components.interfaces
+* (interesting stuff only reflected into JavaScript)
+*/
+[scriptable, uuid(b8c31bba-79db-4a1d-930d-4cdd68713f9e)]
+interface nsIXPCComponents_Interfaces : nsISupports
+{
+};
+
+/**
+* interface of Components.classes
+* (interesting stuff only reflected into JavaScript)
+*/
+[scriptable, uuid(978ff520-d26c-11d2-9842-006008962422)]
+interface nsIXPCComponents_Classes : nsISupports
+{
+};
+
+/**
+* interface of Components.classesByID
+* (interesting stuff only reflected into JavaScript)
+*/
+[scriptable, uuid(336a9590-4d19-11d3-9893-006008962422)]
+interface nsIXPCComponents_ClassesByID : nsISupports
+{
+};
+
+/**
+* interface of Components.results
+* (interesting stuff only reflected into JavaScript)
+*/
+[scriptable, uuid(2fc229a0-5860-11d3-9899-006008962422)]
+interface nsIXPCComponents_Results : nsISupports
+{
+};
+
+/**
+* interface of Components.ID
+* (interesting stuff only reflected into JavaScript)
+*/
+[scriptable, uuid(7994a6e0-e028-11d3-8f5d-0010a4e73d9a)]
+interface nsIXPCComponents_ID : nsISupports
+{
+};
+
+/**
+* interface of Components.Exception
+* (interesting stuff only reflected into JavaScript)
+*/
+[scriptable, uuid(5bf039c0-e028-11d3-8f5d-0010a4e73d9a)]
+interface nsIXPCComponents_Exception : nsISupports
+{
+};
+
+/**
+* interface of Components.Constructor
+* (interesting stuff only reflected into JavaScript)
+*/
+[scriptable, uuid(88655640-e028-11d3-8f5d-0010a4e73d9a)]
+interface nsIXPCComponents_Constructor : nsISupports
+{
+};
+
+/**
+* interface of object returned by Components.Constructor
+* (additional interesting stuff only reflected into JavaScript)
+*/
+[scriptable, uuid(c814ca20-e0dc-11d3-8f5f-0010a4e73d9a)]
+interface nsIXPCConstructor : nsISupports
+{
+ readonly attribute nsIJSCID classID;
+ readonly attribute nsIJSIID interfaceID;
+ readonly attribute string initializer;
+};
+
+/**
+* interface of object returned by Components.utils.Sandbox.
+*/
+[scriptable, uuid(4f8ae0dc-d266-4a32-875b-6a9de71a8ce9)]
+interface nsIXPCComponents_utils_Sandbox : nsISupports
+{
+};
+
+/**
+ * interface for callback to be passed to Cu.schedulePreciseGC
+ */
+[scriptable, function, uuid(71000535-b0fd-44d1-8ce0-909760e3953c)]
+interface ScheduledGCCallback : nsISupports
+{
+ void callback();
+};
+
+/**
+* interface of Components.utils
+*/
+[scriptable, uuid(86003fe3-ee9a-4620-91dc-eef8b1e58815)]
+interface nsIXPCComponents_Utils : nsISupports
+{
+
+ /* reportError is designed to be called from JavaScript only.
+ *
+ * It will report a JS Error object to the JS console, and return. It
+ * is meant for use in exception handler blocks which want to "eat"
+ * an exception, but still want to report it to the console.
+ *
+ * It must be called with one param, usually an object which was caught by
+ * an exception handler. If it is not a JS error object, the parameter
+ * is converted to a string and reported as a new error.
+ */
+ [implicit_jscontext] void reportError(in jsval error);
+
+ readonly attribute nsIXPCComponents_utils_Sandbox Sandbox;
+
+ /*
+ * evalInSandbox is designed to be called from JavaScript only.
+ *
+ * evalInSandbox evaluates the provided source string in the given sandbox.
+ * It returns the result of the evaluation to the caller.
+ *
+ * var s = new C.u.Sandbox("http://www.mozilla.org");
+ * var res = C.u.evalInSandbox("var five = 5; 2 + five", s);
+ * var outerFive = s.five;
+ * s.seven = res;
+ * var thirtyFive = C.u.evalInSandbox("five * seven", s);
+ */
+ [implicit_jscontext,optional_argc]
+ jsval evalInSandbox(in AString source, in jsval sandbox,
+ [optional] in jsval version,
+ [optional] in AUTF8String filename,
+ [optional] in long lineNo);
+
+ /*
+ * getSandboxAddonId is designed to be called from JavaScript only.
+ *
+ * getSandboxAddonId retrieves the add-on ID associated with
+ * a sandbox object. It will return undefined if there
+ * is no add-on ID attached to the sandbox.
+ *
+ * var s = C.u.Sandbox(..., { addonId: "123" });
+ * var id = C.u.getSandboxAddonId(s);
+ */
+ [implicit_jscontext]
+ jsval getSandboxAddonId(in jsval sandbox);
+
+ /*
+ * getSandboxMetadata is designed to be called from JavaScript only.
+ *
+ * getSandboxMetadata retrieves the metadata associated with
+ * a sandbox object. It will return undefined if there
+ * is no metadata attached to the sandbox.
+ *
+ * var s = C.u.Sandbox(..., { metadata: "metadata" });
+ * var metadata = C.u.getSandboxMetadata(s);
+ */
+ [implicit_jscontext]
+ jsval getSandboxMetadata(in jsval sandbox);
+
+ /*
+ * setSandboxMetadata is designed to be called from JavaScript only.
+ *
+ * setSandboxMetadata sets the metadata associated with
+ * a sandbox object.
+ *
+ * Note that the metadata object will be copied before being used.
+ * The copy will be performed using the structured clone algorithm.
+ * Note that this algorithm does not support reflectors and
+ * it will throw if it encounters them.
+ */
+ [implicit_jscontext]
+ void setSandboxMetadata(in jsval sandbox, in jsval metadata);
+
+ /*
+ * import is designed to be called from JavaScript only.
+ *
+ * Synchronously loads and evaluates the js file located at
+ * 'registryLocation' with a new, fully privileged global object.
+ *
+ * If 'targetObj' is specified and equal to null, returns the
+ * module's global object. Otherwise (if 'targetObj' is not
+ * specified, or 'targetObj' is != null) looks for a property
+ * 'EXPORTED_SYMBOLS' on the new global object. 'EXPORTED_SYMBOLS'
+ * is expected to be an array of strings identifying properties on
+ * the global object. These properties will be installed as
+ * properties on 'targetObj', or, if 'targetObj' is not specified,
+ * on the caller's global object. If 'EXPORTED_SYMBOLS' is not
+ * found, an error is thrown.
+ *
+ * @param resourceURI A resource:// URI string to load the module from.
+ * @param targetObj the object to install the exported properties on.
+ * If this parameter is a primitive value, this method throws
+ * an exception.
+ * @returns the module code's global object.
+ *
+ * The implementation maintains a hash of registryLocation->global obj.
+ * Subsequent invocations of importModule with 'registryLocation'
+ * pointing to the same file will not cause the module to be re-evaluated,
+ * but the symbols in EXPORTED_SYMBOLS will be exported into the
+ * specified target object and the global object returned as above.
+ *
+ * (This comment is duplicated from xpcIJSModuleLoader.)
+ */
+ [implicit_jscontext,optional_argc]
+ jsval import(in AUTF8String aResourceURI, [optional] in jsval targetObj);
+
+ /**
+ * Returns true if the js file located at 'registryLocation' location has
+ * been loaded previously via the import method above. Returns false
+ * otherwise.
+ *
+ * @param resourceURI A resource:// URI string representing the location of
+ * the js file to be checked if it is already loaded or not.
+ * @returns boolean, true if the js file has been loaded via import. false
+ * otherwise
+ */
+ boolean isModuleLoaded(in AUTF8String aResourceURI);
+
+ /*
+ * Unloads the JS module at 'registryLocation'. Existing references to the
+ * module will continue to work but any subsequent import of the module will
+ * reload it and give new reference. If the JS module hasn't yet been
+ * imported then this method will do nothing.
+ *
+ * @param resourceURI A resource:// URI string to unload the module from.
+ */
+ void unload(in AUTF8String registryLocation);
+
+ /*
+ * Imports global properties (like DOM constructors) into the scope, defining
+ * them on the caller's global. aPropertyList should be an array of property
+ * names.
+ *
+ * See xpc::GlobalProperties::Parse for the current list of supported
+ * properties.
+ */
+ [implicit_jscontext]
+ void importGlobalProperties(in jsval aPropertyList);
+
+ /*
+ * To be called from JS only.
+ *
+ * Return a weak reference for the given JS object.
+ */
+ [implicit_jscontext]
+ xpcIJSWeakReference getWeakReference(in jsval obj);
+
+ /*
+ * To be called from JS only.
+ *
+ * Force an immediate garbage collection cycle.
+ */
+ void forceGC();
+
+ /*
+ * To be called from JS only.
+ *
+ * Force an immediate cycle collection cycle.
+ */
+ void forceCC([optional] in nsICycleCollectorListener aListener);
+
+ /*
+ * To be called from JS only.
+ *
+ * If any incremental CC is in progress, finish it. For testing.
+ */
+ void finishCC();
+
+ /*
+ * To be called from JS only.
+ *
+ * Do some cycle collector work, with the given work budget.
+ * The cost of calling Traverse() on a single object is set as 1.
+ * For testing.
+ */
+ void ccSlice(in long long budget);
+
+ /*
+ * To be called from JS only.
+ *
+ * Return the longest cycle collector slice time since the last
+ * time clearMaxCCTime() was called.
+ */
+ long getMaxCCSliceTimeSinceClear();
+
+ /*
+ * To be called from JS only.
+ *
+ * Reset the internal max slice time value used for
+ * getMaxCCSliceTimeSinceClear().
+ */
+ void clearMaxCCTime();
+
+ /*
+ * To be called from JS only.
+ *
+ * Force an immediate shrinking garbage collection cycle.
+ */
+ void forceShrinkingGC();
+
+ /*
+ * Schedule a garbage collection cycle for a point in the future when no JS
+ * is running. Call the provided function once this has occurred.
+ */
+ void schedulePreciseGC(in ScheduledGCCallback callback);
+
+ /*
+ * Schedule a shrinking garbage collection cycle for a point in the future
+ * when no JS is running. Call the provided function once this has occured.
+ */
+ void schedulePreciseShrinkingGC(in ScheduledGCCallback callback);
+
+ /*
+ * In a debug build, unlink any ghost windows. This is only for debugging
+ * leaks, and can cause bad things to happen if called.
+ */
+ void unlinkGhostWindows();
+
+ [implicit_jscontext]
+ jsval getJSTestingFunctions();
+
+ /*
+ * To be called from JS only.
+ *
+ * Call 'function', using the provided stack as the async stack responsible
+ * for the call, and propagate its return value or the exception it throws.
+ * The function is called with no arguments, and 'this' is 'undefined'.
+ *
+ * The code in the function will see the given stack frame as the
+ * asyncCaller of its own stack frame, instead of the current caller.
+ */
+ [implicit_jscontext]
+ jsval callFunctionWithAsyncStack(in jsval function, in nsIStackFrame stack,
+ in AString asyncCause);
+
+ /*
+ * To be called from JS only.
+ *
+ * Returns the global object with which the given object is associated.
+ *
+ * @param obj The JavaScript object whose global is to be gotten.
+ * @return the corresponding global.
+ */
+ [implicit_jscontext]
+ jsval getGlobalForObject(in jsval obj);
+
+ /*
+ * To be called from JS only.
+ *
+ * Returns the true if the object is a (scripted) proxy.
+ * NOTE: Security wrappers are unwrapped first before the check.
+ */
+ [implicit_jscontext]
+ boolean isProxy(in jsval vobject);
+
+ /*
+ * To be called from JS only.
+ *
+ * Instead of simply wrapping a function into another compartment,
+ * this helper function creates a native function in the target
+ * compartment and forwards the call to the original function.
+ * That call will be different than a regular JS function call in
+ * that, the |this| is left unbound, and all the non-native JS
+ * object arguments will be cloned using the structured clone
+ * algorithm.
+ * The return value is the new forwarder function, wrapped into
+ * the caller's compartment.
+ * The 3rd argument is an optional options object:
+ * - defineAs: the name of the property that will
+ * be set on the target scope, with
+ * the forwarder function as the value.
+ */
+ [implicit_jscontext]
+ jsval exportFunction(in jsval vfunction, in jsval vscope, [optional] in jsval voptions);
+
+ /*
+ * To be called from JS only.
+ *
+ * Returns an object created in |vobj|'s compartment.
+ * If defineAs property on the options object is a non-null ID,
+ * the new object will be added to vobj as a property. Also, the
+ * returned new object is always automatically waived (see waiveXrays).
+ */
+ [implicit_jscontext]
+ jsval createObjectIn(in jsval vobj, [optional] in jsval voptions);
+
+ /*
+ * To be called from JS only.
+ *
+ * Ensures that all functions come from vobj's scope (and aren't cross
+ * compartment wrappers).
+ */
+ [implicit_jscontext]
+ void makeObjectPropsNormal(in jsval vobj);
+
+ /**
+ * Determines whether this object is backed by a DeadObjectProxy.
+ *
+ * Dead-wrapper objects hold no other objects alive (they have no outgoing
+ * reference edges) and will throw if you touch them (e.g. by
+ * reading/writing a property).
+ */
+ bool isDeadWrapper(in jsval obj);
+
+ /**
+ * Determines whether this object is a cross-process wrapper.
+ */
+ bool isCrossProcessWrapper(in jsval obj);
+
+ /**
+ * CPOWs can have user data attached to them. This data originates
+ * in the local process via the
+ * nsIRemoteTagService.getRemoteObjectTag method. It's sent along
+ * with the CPOW to the remote process, where it can be fetched
+ * with this function, getCrossProcessWrapperTag.
+ */
+ ACString getCrossProcessWrapperTag(in jsval obj);
+
+ /**
+ * If CPOWs are disabled for browser code via the
+ * dom.ipc.cpows.forbid-unsafe-from-browser preferences, then only
+ * add-ons can use CPOWs. This function allows a non-addon scope
+ * to opt into CPOWs. It's necessary for the implementation of
+ * RemoteAddonsParent.jsm.
+ */
+ void permitCPOWsInScope(in jsval obj);
+
+ /*
+ * To be called from JS only. This is for Gecko internal use only, and may
+ * disappear at any moment.
+ *
+ * Forces a recomputation of all wrappers in and out of the compartment
+ * containing |vobj|. If |vobj| is not an object, all wrappers system-wide
+ * are recomputed.
+ */
+ [implicit_jscontext]
+ void recomputeWrappers([optional] in jsval vobj);
+
+ /*
+ * To be called from JS only. This is for Gecko internal use only, and may
+ * disappear at any moment.
+ *
+ * Enables Xray vision for same-compartment access for the compartment
+ * indicated by |vscope|. All outgoing wrappers are recomputed.
+ */
+ [implicit_jscontext]
+ void setWantXrays(in jsval vscope);
+
+ /*
+ * For gecko internal automation use only. Calling this in production code
+ * would result in security vulnerabilities, so it will crash if used outside
+ * of automation.
+ */
+ [implicit_jscontext]
+ void forcePermissiveCOWs();
+
+ /*
+ * Forces the usage of a privileged |Components| object for a potentially-
+ * unprivileged scope. This will crash if used outside of automation.
+ */
+ [implicit_jscontext]
+ void forcePrivilegedComponentsForScope(in jsval vscope);
+
+ /*
+ * This seemingly-paradoxical API allows privileged code to explicitly give
+ * unprivileged code a reference to its own Components object (whereas it's
+ * normally hidden away on a scope chain visible only to XBL methods). See
+ * also SpecialPowers.getComponents.
+ */
+ [implicit_jscontext]
+ jsval getComponentsForScope(in jsval vscope);
+
+ /*
+ * Dispatches a runnable to the current/main thread. If |scope| is passed,
+ * the runnable will be dispatch in the compartment of |scope|, which
+ * affects which error reporter gets called.
+ */
+ [implicit_jscontext]
+ void dispatch(in jsval runnable, [optional] in jsval scope);
+
+ /*
+ * To be called from JS only.
+ *
+ * These are the set of JSContext options that privileged script
+ * is allowed to control for the purposes of testing. These
+ * options should be kept in sync with what's controllable in the
+ * jsshell and by setting prefs in nsJSEnvironment.
+ *
+ * NB: Assume that getting any of these attributes is relatively
+ * cheap, but setting any of them is relatively expensive.
+ */
+ [implicit_jscontext]
+ attribute boolean strict;
+
+ [implicit_jscontext]
+ attribute boolean werror;
+
+ [implicit_jscontext]
+ attribute boolean strict_mode;
+
+ [implicit_jscontext]
+ attribute boolean ion;
+
+ [implicit_jscontext]
+ void setGCZeal(in long zeal);
+
+ [implicit_jscontext]
+ void nukeSandbox(in jsval obj);
+
+ /*
+ * API to dynamically block script for a given global. This takes effect
+ * immediately, unlike other APIs that only affect newly-created globals.
+ *
+ * The machinery here maintains a counter, and allows script only if each
+ * call to blockScriptForGlobal() has been matched with a call to
+ * unblockScriptForGlobal(). The caller _must_ make sure never to call
+ * unblock() more times than it calls block(), since that could potentially
+ * interfere with another consumer's script blocking.
+ */
+
+ [implicit_jscontext]
+ void blockScriptForGlobal(in jsval global);
+
+ [implicit_jscontext]
+ void unblockScriptForGlobal(in jsval global);
+
+ /**
+ * Check whether the given object is an XrayWrapper.
+ */
+ bool isXrayWrapper(in jsval obj);
+
+ /**
+ * Waive Xray on a given value. Identity op for primitives.
+ */
+ [implicit_jscontext]
+ jsval waiveXrays(in jsval aVal);
+
+ /**
+ * Strip off Xray waivers on a given value. Identity op for primitives.
+ */
+ [implicit_jscontext]
+ jsval unwaiveXrays(in jsval aVal);
+
+ /**
+ * Gets the name of the JSClass of the object.
+ *
+ * if |aUnwrap| is true, all wrappers are unwrapped first. Unless you're
+ * specifically trying to detect whether the object is a proxy, this is
+ * probably what you want.
+ */
+ [implicit_jscontext]
+ string getClassName(in jsval aObj, in bool aUnwrap);
+
+ /**
+ * Get a DOM classinfo for the given classname. Only some class
+ * names are supported.
+ */
+ nsIClassInfo getDOMClassInfo(in AString aClassName);
+
+ /**
+ * Gets the incument global for the execution of this function. For internal
+ * and testing use only.
+ *
+ * If |callback| is passed, it is invoked with the incumbent global as its
+ * sole argument. This allows the incumbent global to be measured in callback
+ * environments with no scripted frames on the stack.
+ */
+ [implicit_jscontext]
+ jsval getIncumbentGlobal([optional] in jsval callback);
+
+ /**
+ * Forces the generation of an XPCWrappedJS for a given object. For internal
+ * and testing use only. This is only useful to set up wrapper map conditions
+ * for a testcase. The return value is not an XPCWrappedJS itself, but an
+ * opaque nsISupports holder that keeps the underlying XPCWrappedJS alive.
+ *
+ * if |scope| is passed, the XPCWrappedJS is generated in the scope of that object.
+ */
+ [implicit_jscontext]
+ nsISupports generateXPCWrappedJS(in jsval obj, [optional] in jsval scope);
+
+ /**
+ * Retrieve the last time, in microseconds since epoch, that a given
+ * watchdog-related event occured.
+ *
+ * Valid categories:
+ * "ContextStateChange" - Context switching between active and inactive states
+ * "WatchdogWakeup" - Watchdog waking up from sleeping
+ * "WatchdogHibernateStart" - Watchdog begins hibernating
+ * "WatchdogHibernateStop" - Watchdog stops hibernating
+ */
+ PRTime getWatchdogTimestamp(in AString aCategory);
+
+ [implicit_jscontext]
+ jsval getJSEngineTelemetryValue();
+
+ /*
+ * Clone an object into a scope.
+ * The 3rd argument is an optional options object:
+ * - cloneFunctions: boolean. If true, functions in the value are
+ * wrapped in a function forwarder that appears to be a native function in
+ * the content scope. Defaults to false.
+ * - wrapReflectors: boolean. If true, DOM objects are passed through the
+ * clone directly with cross-compartment wrappers. Otherwise, the clone
+ * fails when such an object is encountered. Defaults to false.
+ */
+ [implicit_jscontext]
+ jsval cloneInto(in jsval value, in jsval scope, [optional] in jsval options);
+
+ /*
+ * When C++-Implemented code does security checks, it can generally query
+ * the subject principal (i.e. the principal of the most-recently-executed
+ * script) in order to determine the responsible party. However, when an API
+ * is implemented in JS, this doesn't work - the most-recently-executed
+ * script is always the System-Principaled API implementation. So we need
+ * another mechanism.
+ *
+ * Hence the notion of the "WebIDL Caller". If the current Entry Script on
+ * the Script Settings Stack represents the invocation of JS-implemented
+ * WebIDL, this API returns the principal of the caller at the time
+ * of invocation. Otherwise (i.e. outside of JS-implemented WebIDL), this
+ * function throws. If it throws, you probably shouldn't be using it.
+ */
+ nsIPrincipal getWebIDLCallerPrincipal();
+
+ /*
+ * Gets the principal of a script object, after unwrapping any cross-
+ * compartment wrappers.
+ */
+ [implicit_jscontext]
+ nsIPrincipal getObjectPrincipal(in jsval obj);
+
+ /*
+ * Gets the URI or identifier string associated with an object's
+ * compartment (the same one used by the memory reporter machinery).
+ *
+ * Unwraps cross-compartment wrappers first.
+ *
+ * The string formats and values may change at any time. Do not depend on
+ * this from addon code.
+ */
+ [implicit_jscontext]
+ ACString getCompartmentLocation(in jsval obj);
+
+ [implicit_jscontext]
+ void setAddonInterposition(in ACString addonId, in nsIAddonInterposition interposition);
+
+ /*
+ * Enables call interpositions from addon scopes to any functions in the scope of |target|.
+ */
+ [implicit_jscontext]
+ void setAddonCallInterposition(in jsval target);
+
+ [implicit_jscontext]
+ void allowCPOWsInAddon(in ACString addonId, in bool allow);
+
+ /*
+ * Return a fractional number of milliseconds from process
+ * startup, measured with a monotonic clock.
+ */
+ double now();
+};
+
+/**
+* Interface for the 'Components' object.
+*
+* The first interface contains things that are available to non-chrome XBL code
+* that runs in a scope with an nsExpandedPrincipal. The second interface
+* includes members that are only exposed to chrome.
+*/
+
+[scriptable, uuid(eeeada2f-86c0-4609-b2bf-4bf2351b1ce6)]
+interface nsIXPCComponentsBase : nsISupports
+{
+ readonly attribute nsIXPCComponents_Interfaces interfaces;
+ readonly attribute nsIXPCComponents_InterfacesByID interfacesByID;
+ readonly attribute nsIXPCComponents_Results results;
+
+ boolean isSuccessCode(in nsresult result);
+
+};
+
+[scriptable, uuid(aa28aaf6-70ce-4b03-9514-afe43c7dfda8)]
+interface nsIXPCComponents : nsIXPCComponentsBase
+{
+ readonly attribute nsIXPCComponents_Classes classes;
+ readonly attribute nsIXPCComponents_ClassesByID classesByID;
+ // Will return null if there is no JS stack right now.
+ readonly attribute nsIStackFrame stack;
+ readonly attribute nsIComponentManager manager;
+ readonly attribute nsIXPCComponents_Utils utils;
+
+ readonly attribute nsIXPCComponents_ID ID;
+ readonly attribute nsIXPCComponents_Exception Exception;
+ readonly attribute nsIXPCComponents_Constructor Constructor;
+
+ [implicit_jscontext]
+ // A javascript component can set |returnCode| to specify an nsresult to
+ // be returned without throwing an exception.
+ attribute jsval returnCode;
+
+ /* @deprecated Use Components.utils.reportError instead. */
+ [deprecated, implicit_jscontext] void reportError(in jsval error);
+};