diff options
| -rw-r--r-- | docs/devel/qapi-code-gen.txt | 38 | ||||
| -rw-r--r-- | qapi/introspect.json | 6 | ||||
| -rw-r--r-- | scripts/qapi/common.py | 66 | ||||
| -rwxr-xr-x | scripts/qapi/doc.py | 3 | ||||
| -rw-r--r-- | scripts/qapi/introspect.py | 6 | ||||
| -rw-r--r-- | scripts/qapi/types.py | 3 | ||||
| -rw-r--r-- | scripts/qapi/visit.py | 3 | ||||
| -rw-r--r-- | tests/qapi-schema/double-type.err | 2 | ||||
| -rw-r--r-- | tests/qapi-schema/test-qapi.py | 3 | ||||
| -rw-r--r-- | tests/qapi-schema/unknown-expr-key.err | 2 |
10 files changed, 114 insertions, 18 deletions
diff --git a/docs/devel/qapi-code-gen.txt b/docs/devel/qapi-code-gen.txt index b517b0cfbf..e8ec8ac1de 100644 --- a/docs/devel/qapi-code-gen.txt +++ b/docs/devel/qapi-code-gen.txt @@ -719,6 +719,34 @@ any non-empty complex type (struct, union, or alternate), and a pointer to that QAPI type is passed as a single argument. +=== Features === + +Sometimes, the behaviour of QEMU changes compatibly, but 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 the extension is available. + +For this purpose, a list of features can be specified for a struct type. +This is exposed to the client as a list of string, where each string +signals that this build of QEMU shows a certain behaviour. + +In the schema, features can be specified as simple strings, for example: + +{ 'struct': 'TestType', + 'data': { 'number': 'int' }, + 'features': [ 'allow-negative-numbers' ] } + +Another option is to specify features as dictionaries, where the key +'name' specifies the feature string to be exposed to clients: + +{ 'struct': 'TestType', + 'data': { 'number': 'int' }, + 'features': [ { 'name': 'allow-negative-numbers' } ] } + +This expanded form is necessary if you want to make the feature +conditional (see below in "Configuring the schema"). + + === Downstream extensions === QAPI schema names that are externally visible, say in the Client JSON @@ -771,6 +799,16 @@ Example: a conditional 'bar' enum member. [ 'foo', { 'name' : 'bar', 'if': 'defined(IFCOND)' } ] } +Similarly, features can be specified as a dictionary with a 'name' and +an 'if' key. + +Example: a conditional 'allow-negative-numbers' feature + +{ 'struct': 'TestType', + 'data': { 'number': 'int' }, + 'features': [ { 'name': 'allow-negative-numbers', + 'if' 'defined(IFCOND)' } ] } + Please note that you are responsible to ensure that the C code will compile with an arbitrary combination of conditions, since the generators are unable to check it at this point. diff --git a/qapi/introspect.json b/qapi/introspect.json index 3d22166b2b..1843c1cb17 100644 --- a/qapi/introspect.json +++ b/qapi/introspect.json @@ -174,6 +174,9 @@ # and may even differ from the order of the values of the # enum type of the @tag. # +# @features: names of features associated with the type, in no particular +# order. (since: 4.1) +# # Values of this type are JSON object on the wire. # # Since: 2.5 @@ -181,7 +184,8 @@ { 'struct': 'SchemaInfoObject', 'data': { 'members': [ 'SchemaInfoObjectMember' ], '*tag': 'str', - '*variants': [ 'SchemaInfoObjectVariant' ] } } + '*variants': [ 'SchemaInfoObjectVariant' ], + '*features': [ 'str' ] } } ## # @SchemaInfoObjectMember: diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py index f07869ec73..9e4b6c00b5 100644 --- a/scripts/qapi/common.py +++ b/scripts/qapi/common.py @@ -886,12 +886,26 @@ def check_enum(expr, info): def check_struct(expr, info): name = expr['struct'] members = expr['data'] + features = expr.get('features') check_type(info, "'data' for struct '%s'" % name, members, allow_dict=True, allow_optional=True) check_type(info, "'base' for struct '%s'" % name, expr.get('base'), allow_metas=['struct']) + if features: + if not isinstance(features, list): + raise QAPISemError(info, + "Struct '%s' requires an array for 'features'" % + name) + for f in features: + assert isinstance(f, dict) + check_known_keys(info, "feature of struct %s" % name, f, + ['name'], ['if']) + + check_if(f, info) + check_name(info, "Feature of struct %s" % name, f['name']) + def check_known_keys(info, source, keys, required, optional): @@ -948,6 +962,12 @@ def normalize_members(members): members[key] = {'type': arg} +def normalize_features(features): + if isinstance(features, list): + features[:] = [f if isinstance(f, dict) else {'name': f} + for f in features] + + def check_exprs(exprs): global all_names @@ -986,8 +1006,10 @@ def check_exprs(exprs): normalize_members(expr['data']) elif 'struct' in expr: meta = 'struct' - check_keys(expr_elem, 'struct', ['data'], ['base', 'if']) + check_keys(expr_elem, 'struct', ['data'], + ['base', 'if', 'features']) normalize_members(expr['data']) + normalize_features(expr.get('features')) struct_types[expr[meta]] = expr elif 'command' in expr: meta = 'command' @@ -1126,10 +1148,12 @@ class QAPISchemaVisitor(object): def visit_array_type(self, name, info, ifcond, element_type): pass - def visit_object_type(self, name, info, ifcond, base, members, variants): + def visit_object_type(self, name, info, ifcond, base, members, variants, + features): pass - def visit_object_type_flat(self, name, info, ifcond, members, variants): + def visit_object_type_flat(self, name, info, ifcond, members, variants, + features): pass def visit_alternate_type(self, name, info, ifcond, variants): @@ -1290,7 +1314,7 @@ class QAPISchemaArrayType(QAPISchemaType): class QAPISchemaObjectType(QAPISchemaType): def __init__(self, name, info, doc, ifcond, - base, local_members, variants): + base, local_members, variants, features): # struct has local_members, optional base, and no variants # flat union has base, variants, and no local_members # simple union has local_members, variants, and no base @@ -1302,11 +1326,15 @@ class QAPISchemaObjectType(QAPISchemaType): if variants is not None: assert isinstance(variants, QAPISchemaObjectTypeVariants) variants.set_owner(name) + for f in features: + assert isinstance(f, QAPISchemaFeature) + f.set_owner(name) self._base_name = base self.base = None self.local_members = local_members self.variants = variants self.members = None + self.features = features def check(self, schema): QAPISchemaType.check(self, schema) @@ -1332,6 +1360,12 @@ class QAPISchemaObjectType(QAPISchemaType): self.variants.check(schema, seen) assert self.variants.tag_member in self.members self.variants.check_clash(self.info, seen) + + # Features are in a name space separate from members + seen = {} + for f in self.features: + f.check_clash(self.info, seen) + if self.doc: self.doc.check() @@ -1368,12 +1402,15 @@ class QAPISchemaObjectType(QAPISchemaType): def visit(self, visitor): visitor.visit_object_type(self.name, self.info, self.ifcond, - self.base, self.local_members, self.variants) + self.base, self.local_members, self.variants, + self.features) visitor.visit_object_type_flat(self.name, self.info, self.ifcond, - self.members, self.variants) + self.members, self.variants, + self.features) class QAPISchemaMember(object): + """ Represents object members, enum members and features """ role = 'member' def __init__(self, name, ifcond=None): @@ -1419,6 +1456,10 @@ class QAPISchemaMember(object): return "'%s' %s" % (self.name, self._pretty_owner()) +class QAPISchemaFeature(QAPISchemaMember): + role = 'feature' + + class QAPISchemaObjectTypeMember(QAPISchemaMember): def __init__(self, name, typ, optional, ifcond=None): QAPISchemaMember.__init__(self, name, ifcond) @@ -1675,7 +1716,7 @@ class QAPISchema(object): ('null', 'null', 'QNull' + pointer_suffix)]: self._def_builtin_type(*t) self.the_empty_object_type = QAPISchemaObjectType( - 'q_empty', None, None, None, None, [], None) + 'q_empty', None, None, None, None, [], None, []) self._def_entity(self.the_empty_object_type) qtypes = ['none', 'qnull', 'qnum', 'qstring', 'qdict', 'qlist', @@ -1685,6 +1726,9 @@ class QAPISchema(object): self._def_entity(QAPISchemaEnumType('QType', None, None, None, qtype_values, 'QTYPE')) + def _make_features(self, features): + return [QAPISchemaFeature(f['name'], f.get('if')) for f in features] + def _make_enum_members(self, values): return [QAPISchemaMember(v['name'], v.get('if')) for v in values] @@ -1721,7 +1765,7 @@ class QAPISchema(object): assert ifcond == typ._ifcond # pylint: disable=protected-access else: self._def_entity(QAPISchemaObjectType(name, info, doc, ifcond, - None, members, None)) + None, members, None, [])) return name def _def_enum_type(self, expr, info, doc): @@ -1752,9 +1796,11 @@ class QAPISchema(object): base = expr.get('base') data = expr['data'] ifcond = expr.get('if') + features = expr.get('features', []) self._def_entity(QAPISchemaObjectType(name, info, doc, ifcond, base, self._make_members(data, info), - None)) + None, + self._make_features(features))) def _make_variant(self, case, typ, ifcond): return QAPISchemaObjectTypeVariant(case, typ, ifcond) @@ -1795,7 +1841,7 @@ class QAPISchema(object): QAPISchemaObjectType(name, info, doc, ifcond, base, members, QAPISchemaObjectTypeVariants(tag_name, tag_member, - variants))) + variants), [])) def _def_alternate_type(self, expr, info, doc): name = expr['alternate'] diff --git a/scripts/qapi/doc.py b/scripts/qapi/doc.py index 5c8c136899..433e9fcbfb 100755 --- a/scripts/qapi/doc.py +++ b/scripts/qapi/doc.py @@ -220,7 +220,8 @@ class QAPISchemaGenDocVisitor(qapi.common.QAPISchemaVisitor): body=texi_entity(doc, 'Values', ifcond, member_func=texi_enum_value))) - def visit_object_type(self, name, info, ifcond, base, members, variants): + def visit_object_type(self, name, info, ifcond, base, members, variants, + features): doc = self.cur_doc if base and base.is_implicit(): base = None diff --git a/scripts/qapi/introspect.py b/scripts/qapi/introspect.py index f7f2ca07e4..f62cf0a2e1 100644 --- a/scripts/qapi/introspect.py +++ b/scripts/qapi/introspect.py @@ -188,11 +188,15 @@ const QLitObject %(c_name)s = %(c_string)s; self._gen_qlit('[' + element + ']', 'array', {'element-type': element}, ifcond) - def visit_object_type_flat(self, name, info, ifcond, members, variants): + def visit_object_type_flat(self, name, info, ifcond, members, variants, + features): obj = {'members': [self._gen_member(m) for m in members]} if variants: obj.update(self._gen_variants(variants.tag_member.name, variants.variants)) + if features: + obj['features'] = [(f.name, {'if': f.ifcond}) for f in features] + self._gen_qlit(name, 'object', obj, ifcond) def visit_alternate_type(self, name, info, ifcond, variants): diff --git a/scripts/qapi/types.py b/scripts/qapi/types.py index 2bd6fcd44f..3edd9374aa 100644 --- a/scripts/qapi/types.py +++ b/scripts/qapi/types.py @@ -227,7 +227,8 @@ class QAPISchemaGenTypeVisitor(QAPISchemaModularCVisitor): self._genh.add(gen_array(name, element_type)) self._gen_type_cleanup(name) - def visit_object_type(self, name, info, ifcond, base, members, variants): + def visit_object_type(self, name, info, ifcond, base, members, variants, + features): # Nothing to do for the special empty builtin if name == 'q_empty': return diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py index fd356151d2..484ebb66ad 100644 --- a/scripts/qapi/visit.py +++ b/scripts/qapi/visit.py @@ -324,7 +324,8 @@ class QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor): self._genh.add(gen_visit_decl(name)) self._genc.add(gen_visit_list(name, element_type)) - def visit_object_type(self, name, info, ifcond, base, members, variants): + def visit_object_type(self, name, info, ifcond, base, members, variants, + features): # Nothing to do for the special empty builtin if name == 'q_empty': return diff --git a/tests/qapi-schema/double-type.err b/tests/qapi-schema/double-type.err index 799193dba1..69457173a7 100644 --- a/tests/qapi-schema/double-type.err +++ b/tests/qapi-schema/double-type.err @@ -1,2 +1,2 @@ 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'. diff --git a/tests/qapi-schema/test-qapi.py b/tests/qapi-schema/test-qapi.py index d21fca01fc..f2d6815c86 100644 --- a/tests/qapi-schema/test-qapi.py +++ b/tests/qapi-schema/test-qapi.py @@ -38,7 +38,8 @@ class QAPISchemaTestVisitor(QAPISchemaVisitor): print('array %s %s' % (name, element_type.name)) self._print_if(ifcond) - def visit_object_type(self, name, info, ifcond, base, members, variants): + def visit_object_type(self, name, info, ifcond, base, members, variants, + features): print('object %s' % name) if base: print(' base %s' % base.name) diff --git a/tests/qapi-schema/unknown-expr-key.err b/tests/qapi-schema/unknown-expr-key.err index 6ff8bb99c5..4340eaf894 100644 --- a/tests/qapi-schema/unknown-expr-key.err +++ b/tests/qapi-schema/unknown-expr-key.err @@ -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'. |