C++ XPCJSRuntime::GetJSRuntime方法代码示例

// static
XPCJSRuntime*
XPCJSRuntime::newXPCJSRuntime(nsXPConnect* aXPConnect,
                              nsIJSRuntimeService* aJSRuntimeService)
{
    NS_PRECONDITION(aXPConnect,"bad param");
    NS_PRECONDITION(aJSRuntimeService,"bad param");

    XPCJSRuntime* self;

    self = new XPCJSRuntime(aXPConnect,
                            aJSRuntimeService);

    if(self                                  &&
       self->GetJSRuntime()                  &&
       self->GetContextMap()                 &&
       self->GetWrappedJSMap()               &&
       self->GetWrappedJSClassMap()          &&
       self->GetIID2NativeInterfaceMap()     &&
       self->GetClassInfo2NativeSetMap()     &&
       self->GetNativeSetMap()               &&
       self->GetThisTranslatorMap()          &&
       self->GetNativeScriptableSharedMap()  &&
       self->GetDyingWrappedNativeProtoMap() &&
       self->GetExplicitNativeWrapperMap()   &&
       self->GetMapLock())
    {
        return self;
    }
    delete self;
    return nsnull;
}

void
xpc_PrintAllReferencesTo(void *p)
{
    /* p must be a JS object */
    XPCJSRuntime* rt = nsXPConnect::GetRuntimeInstance();
    JS_DumpHeap(rt->GetJSRuntime(), stdout, nullptr, JSTRACE_OBJECT, p, 0x7fffffff, nullptr);
}

/* attribute JSContext safeJSContext; */
NS_IMETHODIMP
XPCJSContextStack::GetSafeJSContext(JSContext * *aSafeJSContext)
{
    if(!mSafeJSContext)
    {
#ifndef XPCONNECT_STANDALONE
        // Start by getting the principal holder and principal for this
        // context.  If we can't manage that, don't bother with the rest.
        nsRefPtr<nsNullPrincipal> principal = new nsNullPrincipal();
        nsCOMPtr<nsIScriptObjectPrincipal> sop;
        if(principal)
        {
            nsresult rv = principal->Init();
            if(NS_SUCCEEDED(rv))
              sop = new PrincipalHolder(principal);
        }
        if(!sop)
        {
            *aSafeJSContext = nsnull;
            return NS_ERROR_FAILURE;
        }        
#endif /* !XPCONNECT_STANDALONE */
        
        JSRuntime *rt;
        XPCJSRuntime* xpcrt;

        nsXPConnect* xpc = nsXPConnect::GetXPConnect();
        nsCOMPtr<nsIXPConnect> xpcholder(static_cast<nsIXPConnect*>(xpc));

        if(xpc && (xpcrt = xpc->GetRuntime()) && (rt = xpcrt->GetJSRuntime()))
        {
            JSObject *glob;
            mSafeJSContext = JS_NewContext(rt, 8192);
            if(mSafeJSContext)
            {
                nsCString origin;
                principal->GetOrigin(getter_Copies(origin));

                // scoped JS Request
                JSAutoRequest req(mSafeJSContext);

                JSCompartment *compartment;
                nsresult rv = xpc_CreateGlobalObject(mSafeJSContext, &global_class,
                                                     origin, principal, &glob,
                                                     &compartment);
                if(NS_FAILED(rv))
                    glob = nsnull;

#ifndef XPCONNECT_STANDALONE
                if(glob)
                {
                    // Make sure the context is associated with a proper compartment
                    // and not the default compartment.
                    JS_SetGlobalObject(mSafeJSContext, glob);

                    // Note: make sure to set the private before calling
                    // InitClasses
                    nsIScriptObjectPrincipal* priv = nsnull;
                    sop.swap(priv);
                    if(!JS_SetPrivate(mSafeJSContext, glob, priv))
                    {
                        // Drop the whole thing
                        NS_RELEASE(priv);
                        glob = nsnull;
                    }
                }

                // After this point either glob is null and the
                // nsIScriptObjectPrincipal ownership is either handled by the
                // nsCOMPtr or dealt with, or we'll release in the finalize
                // hook.
#endif
                if(glob && NS_FAILED(xpc->InitClasses(mSafeJSContext, glob)))
                {
                    glob = nsnull;
                }

            }
            if(mSafeJSContext && !glob)
            {
                // Destroy the context outside the scope of JSAutoRequest that
                // uses the context in its destructor.
                JS_DestroyContext(mSafeJSContext);
                mSafeJSContext = nsnull;
            }
            // Save it off so we can destroy it later, even if
            // mSafeJSContext has been set to another context
            // via SetSafeJSContext.  If we don't get here,
            // then mSafeJSContext must have been set via
            // SetSafeJSContext, and we're not responsible for
            // destroying the passed-in context.
            mOwnSafeJSContext = mSafeJSContext;
        }
    }

    *aSafeJSContext = mSafeJSContext;
    return mSafeJSContext ? NS_OK : NS_ERROR_UNEXPECTED;
}

JSContext*
XPCJSContextStack::GetSafeJSContext()
{
    if (mSafeJSContext)
        return mSafeJSContext;

    // Start by getting the principal holder and principal for this
    // context.  If we can't manage that, don't bother with the rest.
    nsRefPtr<nsNullPrincipal> principal = new nsNullPrincipal();
    nsresult rv = principal->Init();
    if (NS_FAILED(rv))
        return NULL;

    nsCOMPtr<nsIScriptObjectPrincipal> sop = new PrincipalHolder(principal);

    nsRefPtr<nsXPConnect> xpc = nsXPConnect::GetXPConnect();
    if (!xpc)
        return NULL;

    XPCJSRuntime* xpcrt = xpc->GetRuntime();
    if (!xpcrt)
        return NULL;

    JSRuntime *rt = xpcrt->GetJSRuntime();
    if (!rt)
        return NULL;

    mSafeJSContext = JS_NewContext(rt, 8192);
    if (!mSafeJSContext)
        return NULL;

    JSObject *glob;
    {
        // scoped JS Request
        JSAutoRequest req(mSafeJSContext);

        JS_SetErrorReporter(mSafeJSContext, mozJSLoaderErrorReporter);

        glob = xpc::CreateGlobalObject(mSafeJSContext, &global_class, principal);

        if (glob) {
            // Make sure the context is associated with a proper compartment
            // and not the default compartment.
            JS_SetGlobalObject(mSafeJSContext, glob);

            // Note: make sure to set the private before calling
            // InitClasses
            nsIScriptObjectPrincipal* priv = nullptr;
            sop.swap(priv);
            JS_SetPrivate(glob, priv);
        }

        // After this point either glob is null and the
        // nsIScriptObjectPrincipal ownership is either handled by the
        // nsCOMPtr or dealt with, or we'll release in the finalize
        // hook.
        if (glob && NS_FAILED(xpc->InitClasses(mSafeJSContext, glob))) {
            glob = nullptr;
        }
    }
    if (mSafeJSContext && !glob) {
        // Destroy the context outside the scope of JSAutoRequest that
        // uses the context in its destructor.
        JS_DestroyContext(mSafeJSContext);
        mSafeJSContext = nullptr;
    }

    // Save it off so we can destroy it later.
    mOwnSafeJSContext = mSafeJSContext;

    return mSafeJSContext;
}

/* attribute JSContext safeJSContext; */
NS_IMETHODIMP
XPCJSContextStack::GetSafeJSContext(JSContext * *aSafeJSContext)
{
    if(!mSafeJSContext)
    {
#ifndef XPCONNECT_STANDALONE
        // Start by getting the principal holder and principal for this
        // context.  If we can't manage that, don't bother with the rest.
        nsCOMPtr<nsIPrincipal> principal =
            do_CreateInstance("@mozilla.org/nullprincipal;1");
        nsCOMPtr<nsIScriptObjectPrincipal> sop;
        if(principal)
        {
            sop = new PrincipalHolder(principal);
        }
        if(!sop)
        {
            *aSafeJSContext = nsnull;
            return NS_ERROR_FAILURE;
        }        
#endif /* !XPCONNECT_STANDALONE */
        
        JSRuntime *rt;
        XPCJSRuntime* xpcrt;

        nsXPConnect* xpc = nsXPConnect::GetXPConnect();
        nsCOMPtr<nsIXPConnect> xpcholder(static_cast<nsIXPConnect*>(xpc));

        if(xpc && (xpcrt = xpc->GetRuntime()) && (rt = xpcrt->GetJSRuntime()))
        {
            mSafeJSContext = JS_NewContext(rt, 8192);
            if(mSafeJSContext)
            {
                // scoped JS Request
                AutoJSRequestWithNoCallContext req(mSafeJSContext);
                JSObject *glob;
                glob = JS_NewObject(mSafeJSContext, &global_class, NULL, NULL);

#ifndef XPCONNECT_STANDALONE
                if(glob)
                {
                    // Note: make sure to set the private before calling
                    // InitClasses
                    nsIScriptObjectPrincipal* priv = nsnull;
                    sop.swap(priv);
                    if(!JS_SetPrivate(mSafeJSContext, glob, priv))
                    {
                        // Drop the whole thing
                        NS_RELEASE(priv);
                        glob = nsnull;
                    }
                }

                // After this point either glob is null and the
                // nsIScriptObjectPrincipal ownership is either handled by the
                // nsCOMPtr or dealt with, or we'll release in the finalize
                // hook.
#endif
                if(!glob || NS_FAILED(xpc->InitClasses(mSafeJSContext, glob)))
                {
                    // Explicitly end the request since we are about to kill
                    // the JSContext that 'req' will try to use when it
                    // goes out of scope.
                    req.EndRequest();
                    JS_DestroyContext(mSafeJSContext);
                    mSafeJSContext = nsnull;
                }
                // Save it off so we can destroy it later, even if
                // mSafeJSContext has been set to another context
                // via SetSafeJSContext.  If we don't get here,
                // then mSafeJSContext must have been set via
                // SetSafeJSContext, and we're not responsible for
                // destroying the passed-in context.
                mOwnSafeJSContext = mSafeJSContext;
            }
        }
    }

    *aSafeJSContext = mSafeJSContext;
    return mSafeJSContext ? NS_OK : NS_ERROR_UNEXPECTED;
}