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qapi: Add feature flags to struct types
Sometimes, the behaviour of QEMU changes without a change in the QMP syntax (usually by allowing values or operations that previously resulted in an error). QMP clients may still need to know whether they can rely on the changed behavior. Let's add feature flags to the QAPI schema language, so that we can make such changes visible with schema introspection. An example for a schema definition using feature flags looks like this: { 'struct': 'TestType', 'data': { 'number': 'int' }, 'features': [ 'allow-negative-numbers' ] } Introspection information then looks like this: { "name": "TestType", "meta-type": "object", "members": [ { "name": "number", "type": "int" } ], "features": [ "allow-negative-numbers" ] } This patch implements feature flags only for struct types. We'll implement them more widely as needed. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20190606153803.5278-2-armbru@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
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Original file line number | Diff line number | Diff line change |
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tests/qapi-schema/double-type.json:2: Unknown key 'command' in struct 'bar' | ||
Valid keys are 'base', 'data', 'if', 'struct'. | ||
Valid keys are 'base', 'data', 'features', 'if', 'struct'. |
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Original file line number | Diff line number | Diff line change |
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@@ -1,2 +1,2 @@ | ||
tests/qapi-schema/unknown-expr-key.json:2: Unknown keys 'bogus', 'phony' in struct 'bar' | ||
Valid keys are 'base', 'data', 'if', 'struct'. | ||
Valid keys are 'base', 'data', 'features', 'if', 'struct'. |