Fix native argument handling

Fix native argument handling

Native functions need to fetch arguments differently if they are
called through a closure.

fixes issue 6696.
Committed: https://code.google.com/p/dart/source/detail?r=14937

[siva, 2012-11-15 01:09:20]

lgtm

[hausner, 2012-11-15 01:19:39]

Thank you!

[Ivan Posva, 2012-11-15 07:56:55]

Matthias,

Does the normal native method handling not suffer from this problem?

-Ivan

[hausner, 2012-11-15 16:48:17]

If by 'normal' you mean not closurized, then no, the problem does not exist in
that case since there is no closure passed to the native function.

[Ivan Posva, 2012-11-15 17:27:26]

On 2012/11/15 16:48:17, hausner wrote:
> If by 'normal' you mean not closurized, then no, the problem does not exist in
> that case since there is no closure passed to the native function.

By normal I meant non-VM native methods, aka native methods registered through
the Dart API. One such example are the native methods used by the dart:io
libraries.

-Ivan

[hausner, 2012-11-15 17:31:57]

Those methods I assume use Dart_GetNativeArgument() API to get their parameters,
in which case they are fine.