Re: [Qemu-devel] [PATCH v8 02/26] qapi: New QAPISchema intermediate reperesentation

["Daniel P. Berrange" <berrange@redhat.com>]

On Wed, Sep 16, 2015 at 01:06:05PM +0200, Markus Armbruster wrote:
> The QAPI code generators work with a syntax tree (nested dictionaries)
> plus a few symbol tables (also dictionaries) on the side.
> 
> They have clearly outgrown these simple data structures.  There's lots
> of rummaging around in dictionaries, and information is recomputed on
> the fly.  For the work I'm going to do, I want more clearly defined
> and more convenient interfaces.
> 
> Going forward, I also want less coupling between the back-ends and the
> syntax tree, to make messing with the syntax easier.
> 
> Create a bunch of classes to represent QAPI schemata.
> 
> Have the QAPISchema initializer call the parser, then walk the syntax
> tree to create the new internal representation, and finally perform
> semantic analysis.
> 
> Shortcut: the semantic analysis still relies on existing check_exprs()
> to do the actual semantic checking.  All this code needs to move into
> the classes.  Mark as TODO.
> 
> Simple unions are lowered to flat unions.  Flat unions and structs are
> represented as a more general object type.
> 
> Catching name collisions in generated code would be nice.  Mark as
> TODO.
> 
> We generate array types eagerly, even though most of them aren't used.
> Mark as TODO.
> 
> Nothing uses the new intermediate representation just yet, thus no
> change to generated files.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  scripts/qapi-commands.py       |   2 +-
>  scripts/qapi-event.py          |   2 +-
>  scripts/qapi-types.py          |   2 +-
>  scripts/qapi-visit.py          |   2 +-
>  scripts/qapi.py                | 381 ++++++++++++++++++++++++++++++++++++++++-
>  tests/qapi-schema/test-qapi.py |   2 +-
>  6 files changed, 377 insertions(+), 14 deletions(-)

Reviewed-by: Daniel P. Berrange <berrange@redhat.com>


Regards,
Daniel
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