Merge tag 'pull-qapi-2023-04-26' of https://repo.or.cz/qemu/armbru into staging

QAPI patches patches for 2023-04-26

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* tag 'pull-qapi-2023-04-26' of https://repo.or.cz/qemu/armbru:
  qapi: allow unions to contain further unions
  qapi: Improve specificity of type/member descriptions
  qapi: support updating expected test output via make
  qapi: Require boxed for conditional command and event arguments
  qapi: Fix code generated for optional conditional struct member
  tests/qapi-schema: Cover optional conditional struct member
  tests/qapi-schema: Clean up positive test for conditionals
  tests/qapi-schema: Rename a few conditionals
  tests/qapi-schema: Improve union discriminator coverage
  qapi: Fix to reject 'data': 'mumble' in struct
  qapi: Fix error message when type name or array is expected
  qapi: Simplify code a bit after previous commits
  qapi: Improve error message for unexpected array types
  qapi: Split up check_type()
  qapi: Clean up after removal of simple unions
  qapi/schema: Use super()
  qapi: Fix error message format regression

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

6 files changed, 91 insertions, 59 deletions

diff --git a/scripts/qapi/commands.py b/scripts/qapi/commands.py
index a079378d1b..d1fdf4182c 100644
--- a/scripts/qapi/commands.py
+++ b/scripts/qapi/commands.py
@@ -66,6 +66,7 @@ def gen_call(name: str,
     elif arg_type:
         assert not arg_type.variants
         for memb in arg_type.members:
+            assert not memb.ifcond.is_present()
             if memb.need_has():
                 argstr += 'arg.has_%s, ' % c_name(memb.name)
             argstr += 'arg.%s, ' % c_name(memb.name)
diff --git a/scripts/qapi/expr.py b/scripts/qapi/expr.py
index ca01ea6f4a..cae0a08359 100644
--- a/scripts/qapi/expr.py
+++ b/scripts/qapi/expr.py
@@ -333,62 +333,56 @@ def normalize_members(members: object) -> None:
             members[key] = {'type': arg}
 
 
-def check_type(value: Optional[object],
-               info: QAPISourceInfo,
-               source: str,
-               allow_array: bool = False,
-               allow_dict: Union[bool, str] = False) -> None:
+def check_type_name(value: Optional[object],
+                    info: QAPISourceInfo, source: str) -> None:
+    if value is not None and not isinstance(value, str):
+        raise QAPISemError(info, "%s should be a type name" % source)
+
+
+def check_type_name_or_array(value: Optional[object],
+                             info: QAPISourceInfo, source: str) -> None:
+    if value is None or isinstance(value, str):
+        return
+
+    if not isinstance(value, list):
+        raise QAPISemError(info,
+                           "%s should be a type name or array" % source)
+
+    if len(value) != 1 or not isinstance(value[0], str):
+        raise QAPISemError(info,
+                           "%s: array type must contain single type name" %
+                           source)
+
+
+def check_type_implicit(value: Optional[object],
+                        info: QAPISourceInfo, source: str,
+                        parent_name: Optional[str]) -> None:
     """
-    Normalize and validate the QAPI type of ``value``.
+    Normalize and validate an optional implicit struct type.
 
-    Python types of ``str`` or ``None`` are always allowed.
+    Accept ``None`` or a ``dict`` defining an implicit struct type.
+    The latter is normalized in place.
 
     :param value: The value to check.
     :param info: QAPI schema source file information.
     :param source: Error string describing this ``value``.
-    :param allow_array:
-        Allow a ``List[str]`` of length 1, which indicates an array of
-        the type named by the list element.
-    :param allow_dict:
-        Allow a dict.  Its members can be struct type members or union
-        branches.  When the value of ``allow_dict`` is in pragma
-        ``member-name-exceptions``, the dict's keys may violate the
-        member naming rules.  The dict members are normalized in place.
+    :param parent_name:
+        When the value of ``parent_name`` is in pragma
+        ``member-name-exceptions``, an implicit struct type may
+        violate the member naming rules.
 
     :raise QAPISemError: When ``value`` fails validation.
-    :return: None, ``value`` is normalized in-place as needed.
+    :return: None
     """
     if value is None:
         return
 
-    # Type name
-    if isinstance(value, str):
-        return
-
-    # Array type
-    if isinstance(value, list):
-        if not allow_array:
-            raise QAPISemError(info, "%s cannot be an array" % source)
-        if len(value) != 1 or not isinstance(value[0], str):
-            raise QAPISemError(info,
-                               "%s: array type must contain single type name" %
-                               source)
-        return
-
-    # Anonymous type
-
-    if not allow_dict:
-        raise QAPISemError(info, "%s should be a type name" % source)
-
     if not isinstance(value, dict):
         raise QAPISemError(info,
                            "%s should be an object or type name" % source)
 
-    permissive = False
-    if isinstance(allow_dict, str):
-        permissive = allow_dict in info.pragma.member_name_exceptions
+    permissive = parent_name in info.pragma.member_name_exceptions
 
-    # value is a dictionary, check that each member is okay
     for (key, arg) in value.items():
         key_source = "%s member '%s'" % (source, key)
         if key.startswith('*'):
@@ -401,7 +395,16 @@ def check_type(value: Optional[object],
         check_keys(arg, info, key_source, ['type'], ['if', 'features'])
         check_if(arg, info, key_source)
         check_features(arg.get('features'), info)
-        check_type(arg['type'], info, key_source, allow_array=True)
+        check_type_name_or_array(arg['type'], info, key_source)
+
+
+def check_type_name_or_implicit(value: Optional[object],
+                                info: QAPISourceInfo, source: str,
+                                parent_name: Optional[str]) -> None:
+    if value is None or isinstance(value, str):
+        return
+
+    check_type_implicit(value, info, source, parent_name)
 
 
 def check_features(features: Optional[object],
@@ -489,8 +492,8 @@ def check_struct(expr: QAPIExpression) -> None:
     name = cast(str, expr['struct'])  # Checked in check_exprs
     members = expr['data']
 
-    check_type(members, expr.info, "'data'", allow_dict=name)
-    check_type(expr.get('base'), expr.info, "'base'")
+    check_type_implicit(members, expr.info, "'data'", name)
+    check_type_name(expr.get('base'), expr.info, "'base'")
 
 
 def check_union(expr: QAPIExpression) -> None:
@@ -508,7 +511,7 @@ def check_union(expr: QAPIExpression) -> None:
     members = expr['data']
     info = expr.info
 
-    check_type(base, info, "'base'", allow_dict=name)
+    check_type_name_or_implicit(base, info, "'base'", name)
     check_name_is_str(discriminator, info, "'discriminator'")
 
     if not isinstance(members, dict):
@@ -518,7 +521,7 @@ def check_union(expr: QAPIExpression) -> None:
         source = "'data' member '%s'" % key
         check_keys(value, info, source, ['type'], ['if'])
         check_if(value, info, source)
-        check_type(value['type'], info, source, allow_array=not base)
+        check_type_name(value['type'], info, source)
 
 
 def check_alternate(expr: QAPIExpression) -> None:
@@ -544,7 +547,7 @@ def check_alternate(expr: QAPIExpression) -> None:
         check_name_lower(key, info, source)
         check_keys(value, info, source, ['type'], ['if'])
         check_if(value, info, source)
-        check_type(value['type'], info, source, allow_array=True)
+        check_type_name_or_array(value['type'], info, source)
 
 
 def check_command(expr: QAPIExpression) -> None:
@@ -560,10 +563,13 @@ def check_command(expr: QAPIExpression) -> None:
     rets = expr.get('returns')
     boxed = expr.get('boxed', False)
 
-    if boxed and args is None:
-        raise QAPISemError(expr.info, "'boxed': true requires 'data'")
-    check_type(args, expr.info, "'data'", allow_dict=not boxed)
-    check_type(rets, expr.info, "'returns'", allow_array=True)
+    if boxed:
+        if args is None:
+            raise QAPISemError(expr.info, "'boxed': true requires 'data'")
+        check_type_name(args, expr.info, "'data'")
+    else:
+        check_type_name_or_implicit(args, expr.info, "'data'", None)
+    check_type_name_or_array(rets, expr.info, "'returns'")
 
 
 def check_event(expr: QAPIExpression) -> None:
@@ -578,9 +584,12 @@ def check_event(expr: QAPIExpression) -> None:
     args = expr.get('data')
     boxed = expr.get('boxed', False)
 
-    if boxed and args is None:
-        raise QAPISemError(expr.info, "'boxed': true requires 'data'")
-    check_type(args, expr.info, "'data'", allow_dict=not boxed)
+    if boxed:
+        if args is None:
+            raise QAPISemError(expr.info, "'boxed': true requires 'data'")
+        check_type_name(args, expr.info, "'data'")
+    else:
+        check_type_name_or_implicit(args, expr.info, "'data'", None)
 
 
 def check_exprs(exprs: List[QAPIExpression]) -> List[QAPIExpression]:
diff --git a/scripts/qapi/gen.py b/scripts/qapi/gen.py
index b5a8d03e8e..8f8f784f4a 100644
--- a/scripts/qapi/gen.py
+++ b/scripts/qapi/gen.py
@@ -119,6 +119,7 @@ def build_params(arg_type: Optional[QAPISchemaObjectType],
     elif arg_type:
         assert not arg_type.variants
         for memb in arg_type.members:
+            assert not memb.ifcond.is_present()
             ret += sep
             sep = ', '
             if memb.need_has():
diff --git a/scripts/qapi/main.py b/scripts/qapi/main.py
index fc216a53d3..316736b6a2 100644
--- a/scripts/qapi/main.py
+++ b/scripts/qapi/main.py
@@ -98,6 +98,6 @@ def main() -> int:
                  builtins=args.builtins,
                  gen_tracing=not args.suppress_tracing)
     except QAPIError as err:
-        print(f"{sys.argv[0]}: {str(err)}", file=sys.stderr)
+        print(err, file=sys.stderr)
         return 1
     return 0
diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index 207e4d71f3..231ebf61ba 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -259,7 +259,7 @@ class QAPISchemaType(QAPISchemaEntity):
         return not self.c_type().endswith(POINTER_SUFFIX)
 
     def check(self, schema):
-        QAPISchemaEntity.check(self, schema)
+        super().check(schema)
         for feat in self.features:
             if feat.is_special():
                 raise QAPISemError(
@@ -465,9 +465,10 @@ class QAPISchemaObjectType(QAPISchemaType):
     # on behalf of info, which is not necessarily self.info
     def check_clash(self, info, seen):
         assert self._checked
-        assert not self.variants       # not implemented
         for m in self.members:
             m.check_clash(info, seen)
+        if self.variants:
+            self.variants.check_clash(info, seen)
 
     def connect_doc(self, doc=None):
         super().connect_doc(doc)
@@ -486,6 +487,10 @@ class QAPISchemaObjectType(QAPISchemaType):
         assert self.members is not None
         return not self.members and not self.variants
 
+    def has_conditional_members(self):
+        assert self.members is not None
+        return any(m.ifcond.is_present() for m in self.members)
+
     def c_name(self):
         assert self.name != 'q_empty'
         return super().c_name()
@@ -652,8 +657,7 @@ class QAPISchemaVariants:
                         self.info,
                         "branch '%s' is not a value of %s"
                         % (v.name, self.tag_member.type.describe()))
-                if (not isinstance(v.type, QAPISchemaObjectType)
-                        or v.type.variants):
+                if not isinstance(v.type, QAPISchemaObjectType):
                     raise QAPISemError(
                         self.info,
                         "%s cannot use %s"
@@ -697,6 +701,7 @@ class QAPISchemaMember:
 
     def describe(self, info):
         role = self.role
+        meta = 'type'
         defined_in = self.defined_in
         assert defined_in
 
@@ -708,13 +713,17 @@ class QAPISchemaMember:
                 # Implicit type created for a command's dict 'data'
                 assert role == 'member'
                 role = 'parameter'
+                meta = 'command'
+                defined_in = defined_in[:-4]
             elif defined_in.endswith('-base'):
                 # Implicit type created for a union's dict 'base'
                 role = 'base ' + role
+                defined_in = defined_in[:-5]
             else:
                 assert False
-        elif defined_in != info.defn_name:
-            return "%s '%s' of type '%s'" % (role, self.name, defined_in)
+
+        if defined_in != info.defn_name:
+            return "%s '%s' of %s '%s'" % (role, self.name, meta, defined_in)
         return "%s '%s'" % (role, self.name)
 
 
@@ -817,6 +826,11 @@ class QAPISchemaCommand(QAPISchemaEntity):
                     self.info,
                     "command's 'data' can take %s only with 'boxed': true"
                     % self.arg_type.describe())
+            self.arg_type.check(schema)
+            if self.arg_type.has_conditional_members() and not self.boxed:
+                raise QAPISemError(
+                    self.info,
+                    "conditional command arguments require 'boxed': true")
         if self._ret_type_name:
             self.ret_type = schema.resolve_type(
                 self._ret_type_name, self.info, "command's 'returns'")
@@ -872,6 +886,11 @@ class QAPISchemaEvent(QAPISchemaEntity):
                     self.info,
                     "event's 'data' can take %s only with 'boxed': true"
                     % self.arg_type.describe())
+            self.arg_type.check(schema)
+            if self.arg_type.has_conditional_members() and not self.boxed:
+                raise QAPISemError(
+                    self.info,
+                    "conditional event arguments require 'boxed': true")
 
     def connect_doc(self, doc=None):
         super().connect_doc(doc)
diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py
index 26a584ee4c..c56ea4d724 100644
--- a/scripts/qapi/visit.py
+++ b/scripts/qapi/visit.py
@@ -74,11 +74,13 @@ bool visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp)
     sep = ''
     for memb in members:
         if memb.optional and not memb.need_has():
+            ret += memb.ifcond.gen_if()
             ret += mcgen('''
     bool has_%(c_name)s = !!obj->%(c_name)s;
 ''',
                          c_name=c_name(memb.name))
             sep = '\n'
+            ret += memb.ifcond.gen_endif()
     ret += sep
 
     if base: