tree c49d6c7672d25980dec64b31e2aebe9aa8d8f154
parent 1e6c1616a91cdcbe9a8387541f7689b8c11632aa
author Markus Armbruster <armbru@redhat.com> 1435306751 +0200
committer Markus Armbruster <armbru@redhat.com> 1441374433 +0200

qapi-visit: Fix generated code when schema has forward refs

The visit_type_implicit_FOO() are generated on demand, right before
their first use.  Used by visit_type_STRUCT_fields() when STRUCT has
base FOO, and by visit_type_UNION() when flat UNION has member a FOO.

If the schema defines FOO after its first use as struct base or flat
union member, visit_type_implicit_FOO() calls
visit_type_implicit_FOO() before its definition, which doesn't
compile.

Rearrange qapi-schema-test.json to demonstrate the bug.

Fix by generating the necessary forward declaration.

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