path: root/js/xpconnect/idl/nsIXPConnect.idl

/* -*- 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/. */

/* The core XPConnect public interfaces. */

#include "nsISupports.idl"

%{ C++
#include "jspubtd.h"
#include "js/CompileOptions.h"
#include "js/TypeDecls.h"
#include "mozilla/Attributes.h"
#include "xptinfo.h"
#include "nsCOMPtr.h"

class nsWrapperCache;
%}

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

// NB: jsval and jsid are declared in nsrootidl.idl

[ptr] native JSContextPtr(JSContext);
[ptr] native JSObjectPtr(JSObject);
[ptr] native JSScriptPtr(JSScript);
[ptr] native nsWrapperCachePtr(nsWrapperCache);
      native JSHandleId(JS::Handle<jsid>);
[ref] native const_JSReadOnlyCompileOptionsRef(const JS::ReadOnlyCompileOptions);

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

// forward declarations...
interface nsIPrincipal;
interface nsIClassInfo;
interface nsIVariant;
interface nsIObjectInputStream;
interface nsIObjectOutputStream;

/***************************************************************************/
[builtinclass, uuid(73e6ff4a-ab99-4d99-ac00-ba39ccb8e4d7)]
interface nsIXPConnectJSObjectHolder : nsISupports
{
    [notxpcom, nostdcall] JSObjectPtr GetJSObject();
};

[builtinclass, uuid(e787be29-db5d-4a45-a3d6-1de1d6b85c30)]
interface nsIXPConnectWrappedNative : nsIXPConnectJSObjectHolder
{
    /* attribute 'JSObject' inherited from nsIXPConnectJSObjectHolder */

    void debugDump(in short depth);

%{C++
    /**
     * Faster access to the native object from C++.  Will never return null.
     */
    nsISupports* Native() const { return mIdentity; }

protected:
    nsCOMPtr<nsISupports> mIdentity;
public:
%}
};

[builtinclass, uuid(3a01b0d6-074b-49ed-bac3-08c76366cae4)]
interface nsIXPConnectWrappedJS : nsIXPConnectJSObjectHolder
{
    /* attribute 'JSObject' inherited from nsIXPConnectJSObjectHolder */
    readonly attribute nsIIDPtr         InterfaceIID;

    // Returns the global object for our JS object. If this object is a
    // cross-compartment wrapper, returns the compartment's first global.
    // The global we return is guaranteed to be same-compartment with the
    // object.
    // Note: this matches the GetJSObject() signature.
    [notxpcom, nostdcall] JSObjectPtr GetJSObjectGlobal();

    void debugDump(in short depth);

    void aggregatedQueryInterface(in nsIIDRef uuid,
                                  [iid_is(uuid),retval] out nsQIResult result);

};

// Special interface to unmark the internal JSObject.
// QIing to nsIXPConnectWrappedJSUnmarkGray does *not* addref, it only unmarks,
// and QIing to nsIXPConnectWrappedJSUnmarkGray is always supposed to fail.
[builtinclass, uuid(c02a0ce6-275f-4ea1-9c23-08494898b070)]
interface nsIXPConnectWrappedJSUnmarkGray : nsIXPConnectWrappedJS
{
};

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


[noscript, builtinclass, uuid(768507b5-b981-40c7-8276-f6a1da502a24)]
interface nsIXPConnect : nsISupports
{
%{ C++
    // This gets a non-addref'd pointer.
    static nsIXPConnect* XPConnect();
%}

    /**
    * wrapNative will create a new JSObject or return an existing one.
    *
    * This method now correctly deals with cases where the passed in xpcom
    * object already has an associated JSObject for the cases:
    *  1) The xpcom object has already been wrapped for use in the same scope
    *     as an nsIXPConnectWrappedNative.
    *  2) The xpcom object is in fact a nsIXPConnectWrappedJS and thus already
    *     has an underlying JSObject.
    *
    * It *might* be possible to QueryInterface the nsIXPConnectJSObjectHolder
    * returned by the method into a nsIXPConnectWrappedNative or a
    * nsIXPConnectWrappedJS.
    *
    * This method will never wrap the JSObject involved in an
    * XPCNativeWrapper before returning.
    *
    * Returns:
    *    success:
    *       NS_OK
    *    failure:
    *       NS_ERROR_XPC_BAD_CONVERT_NATIVE
    *       NS_ERROR_XPC_CANT_GET_JSOBJECT_OF_DOM_OBJECT
    *       NS_ERROR_FAILURE
    */
    JSObjectPtr
    wrapNative(in JSContextPtr aJSContext,
               in JSObjectPtr  aScope,
               in nsISupports  aCOMObj,
               in nsIIDRef     aIID);

    /**
     * Same as wrapNative, but it returns the JSObject in aVal. C++ callers
     * must ensure that aVal is rooted.
     * aIID may be null, it means the same as passing in
     * &NS_GET_IID(nsISupports) but when passing in null certain shortcuts
     * can be taken because we know without comparing IIDs that the caller is
     * asking for an nsISupports wrapper.
     * If aAllowWrapper, then the returned value will be wrapped in the proper
     * type of security wrapper on top of the XPCWrappedNative (if needed).
     * This method doesn't push aJSContext on the context stack, so the caller
     * is required to push it if the top of the context stack is not equal to
     * aJSContext.
     */
    void
    wrapNativeToJSVal(in JSContextPtr aJSContext,
                      in JSObjectPtr  aScope,
                      in nsISupports  aCOMObj,
                      in nsWrapperCachePtr aCache,
                      in nsIIDPtr     aIID,
                      in boolean      aAllowWrapper,
                      out jsval       aVal);

    /**
    * wrapJS will yield a new or previously existing xpcom interface pointer
    * to represent the JSObject passed in.
    *
    * This method now correctly deals with cases where the passed in JSObject
    * already has an associated xpcom interface for the cases:
    *  1) The JSObject has already been wrapped as a nsIXPConnectWrappedJS.
    *  2) The JSObject is in fact a nsIXPConnectWrappedNative and thus already
    *     has an underlying xpcom object.
    *  3) The JSObject is of a jsclass which supports getting the nsISupports
    *     from the JSObject directly. This is used for idlc style objects
    *     (e.g. DOM objects).
    *
    * It *might* be possible to QueryInterface the resulting interface pointer
    * to nsIXPConnectWrappedJS.
    *
    * Returns:
    *   success:
    *     NS_OK
    *    failure:
    *       NS_ERROR_XPC_BAD_CONVERT_JS
    *       NS_ERROR_FAILURE
    */
    void
    wrapJS(in JSContextPtr aJSContext,
           in JSObjectPtr  aJSObj,
           in nsIIDRef     aIID,
           [iid_is(aIID),retval] out nsQIResult result);

    /**
     * Wraps the given jsval in a nsIVariant and returns the new variant.
     */
    nsIVariant
    jSValToVariant(in JSContextPtr cx, in jsval aJSVal);

    /**
    * This only succeeds if the JSObject is a nsIXPConnectWrappedNative.
    * A new wrapper is *never* constructed.
    */
    nsIXPConnectWrappedNative
    getWrappedNativeOfJSObject(in JSContextPtr aJSContext,
                               in JSObjectPtr  aJSObj);

    void debugDump(in short depth);
    void debugDumpObject(in nsISupports aCOMObj, in short depth);
    void debugDumpJSStack(in boolean showArgs,
                          in boolean showLocals,
                          in boolean showThisProps);

    /**
    * wrapJSAggregatedToNative is just like wrapJS except it is used in cases
    * where the JSObject is also aggregated to some native xpcom Object.
    * At present XBL is the only system that might want to do this.
    *
    * XXX write more!
    *
    * Returns:
    *   success:
    *     NS_OK
    *    failure:
    *       NS_ERROR_XPC_BAD_CONVERT_JS
    *       NS_ERROR_FAILURE
    */
    void
    wrapJSAggregatedToNative(in nsISupports  aOuter,
                             in JSContextPtr aJSContext,
                             in JSObjectPtr  aJSObj,
                             in nsIIDRef     aIID,
                             [iid_is(aIID),retval] out nsQIResult result);

    // Methods added since mozilla 0.6....

    jsval variantToJS(in JSContextPtr ctx, in JSObjectPtr scope, in nsIVariant value);
    nsIVariant JSToVariant(in JSContextPtr ctx, in jsval value);

    /**
     * Create a sandbox for evaluating code in isolation using
     * evalInSandboxObject().
     *
     * @param cx A context to use when creating the sandbox object.
     * @param principal The principal (or NULL to use the null principal)
     *                  to use when evaluating code in this sandbox.
     */
    [noscript] JSObjectPtr createSandbox(in JSContextPtr cx, in nsIPrincipal principal);

    /**
     * Evaluate script in a sandbox, completely isolated from all
     * other running scripts.
     *
     * @param source The source of the script to evaluate.
     * @param filename The filename of the script. May be null.
     * @param cx The context to use when setting up the evaluation of
     *           the script. The actual evaluation will happen on a new
     *           temporary context.
     * @param sandbox The sandbox object to evaluate the script in.
     * @return The result of the evaluation as a jsval. If the caller
     *         intends to use the return value from this call the caller
     *         is responsible for rooting the jsval before making a call
     *         to this method.
     */
    [noscript] jsval evalInSandboxObject(in AString source, in string filename,
                                         in JSContextPtr cx,
                                         in JSObjectPtr sandbox);

    [noscript] void writeScript(in nsIObjectOutputStream aStream,
                                in JSContextPtr aJSContext,
                                in JSScriptPtr aJSScript);

    [noscript] JSScriptPtr readScript(in nsIObjectInputStream aStream,
                                      in JSContextPtr aJSContext,
                                      in const_JSReadOnlyCompileOptionsRef aOptions);

    [infallible] readonly attribute boolean isShuttingDown;
};