[PATCH 2/7] jscript: Implement Object.prototype.isPrototypeOf method.

[Jacek Caban]

On 10/25/21 3:30 PM, Gabriel Ivăncescu wrote:
> Signed-off-by: Gabriel Ivăncescu <gabrielopcode at gmail.com>
> ---
>   dlls/jscript/object.c      | 13 +++++++++++--
>   dlls/jscript/tests/lang.js | 13 +++++++++++++
>   2 files changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/dlls/jscript/object.c b/dlls/jscript/object.c
> index 169b47c..8da0ff4 100644
> --- a/dlls/jscript/object.c
> +++ b/dlls/jscript/object.c
> @@ -196,8 +196,17 @@ static HRESULT Object_propertyIsEnumerable(script_ctx_t *ctx, vdisp_t *jsthis, W
>   static HRESULT Object_isPrototypeOf(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, unsigned argc, jsval_t *argv,
>           jsval_t *r)
>   {
> -    FIXME("\n");
> -    return E_NOTIMPL;
> +    jsdisp_t *jsdisp;
> +    BOOL ret = FALSE;
> +
> +    if(!r)
> +        return S_OK;
> +
> +    if(argc && is_jsdisp(jsthis) && is_object_instance(argv[0]) && (jsdisp = to_jsdisp(get_object(argv[0]))))
> +        ret = (jsdisp->prototype == jsthis->u.jsdisp);


That's not what spec says we should do.


> diff --git a/dlls/jscript/tests/lang.js b/dlls/jscript/tests/lang.js
> index ad1217d..bcfe88b 100644
> --- a/dlls/jscript/tests/lang.js
> +++ b/dlls/jscript/tests/lang.js
> @@ -1679,14 +1679,27 @@ tmp = new instanceOfTest();
>   ok((tmp instanceof instanceOfTest) === true, "tmp is not instance of instanceOfTest");
>   ok((tmp instanceof Object) === true, "tmp is not instance of Object");
>   ok((tmp instanceof String) === false, "tmp is instance of String");
> +ok(Object.prototype.isPrototypeOf.call(instanceOfTest, tmp) === false, "instanceOfTest is prototype of tmp");
> +ok(Object.prototype.isPrototypeOf.call(instanceOfTest.prototype, tmp) === true, "instanceOfTest.prototype is not prototype of tmp");


Why do you use call() instead of doing regular calls?


Thanks,

Jacek