Merge remote-tracking branch 'remotes/armbru/tags/pull-qmp-2015-05-05' into staging

drop qapi nested structs

# gpg: Signature made Tue May 5 17:40:40 2015 BST using RSA key ID EB918653
# gpg: Good

Merge remote-tracking branch 'remotes/armbru/tags/pull-qmp-2015-05-05' into staging

drop qapi nested structs

# gpg: Signature made Tue May 5 17:40:40 2015 BST using RSA key ID EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg: aka "Markus Armbruster <armbru@pond.sub.org>"

* remotes/armbru/tags/pull-qmp-2015-05-05: (40 commits)
qapi: Check for member name conflicts with a base class
qapi: Support (subset of) \u escapes in strings
qapi: Tweak doc references to QMP when QGA is also meant
qapi: Drop dead visitor code related to nested structs
qapi: Drop support for inline nested types
qapi: Drop inline nested structs in query-pci
qapi: Drop inline nested struct in query-version
qapi: Drop tests for inline nested structs
qapi: Merge UserDefTwo and UserDefNested in tests
qapi: Forbid 'type' in schema
qapi: Use 'struct' instead of 'type' in schema
qapi: Document 'struct' metatype
qapi: Prefer 'struct' over 'type' in generator
qapi: More rigorous checking for type safety bypass
qapi: Whitelist commands that don't return dictionary
qapi: Require valid names
qapi: More rigourous checking of types
qapi: Add some type check tests
qapi: Unify type bypass and add tests
qapi: Allow true, false and null in schema json
...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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qapi: Tighten checking of unions

Previous commits demonstrated that the generator had several
flaws with less-than-perfect unions:
- a simple union that listed the same branch twice (or two variant

qapi: Tighten checking of unions

Previous commits demonstrated that the generator had several
flaws with less-than-perfect unions:
- a simple union that listed the same branch twice (or two variant
names that map to the same C enumerator, including the implicit
MAX sentinel) ended up generating invalid C code
- an anonymous union that listed two branches with the same qtype
ended up generating invalid C code
- the generator crashed on anonymous union attempts to use an
array type
- the generator was silently ignoring a base type for anonymous
unions
- the generator allowed unknown types or nested anonymous unions
as a branch in an anonymous union

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

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qapi: Add some union tests

Demonstrate that the qapi generator doesn't deal well with unions
that aren't up to par. Later patches will update the expected
reseults as the generator is made stricter.

qapi: Add some union tests

Demonstrate that the qapi generator doesn't deal well with unions
that aren't up to par. Later patches will update the expected
reseults as the generator is made stricter. A few tests work
as planned, but most show poor or missing error messages.

Of particular note, qapi-code-gen.txt documents 'base' only for
flat unions, but the tests here demonstrate that we currently allow
a 'base' to a simple union, although it is exercised only in the
testsuite. Later patches will remove this undocumented feature, to
give us more flexibility in adding other future extensions to union
types. For example, one possible extension is the idea of a
type-safe simple enum, where added fields tie the discriminator to
a user-defined enum type rather than creating an implicit enum from
the names in 'data'. But adding such safety on top of a simple
enum with a base type could look ambiguous with a flat enum;
besides, the documentation also mentions how any simple union can
be represented by an equivalent flat union. So it will be simpler
to just outlaw support for something we aren't using.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

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