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-rw-r--r--docs/sphinx/qapidoc.py14
-rw-r--r--qapi/machine.json2
-rw-r--r--scripts/qapi/parser.py37
-rw-r--r--scripts/qapi/schema.py3
4 files changed, 50 insertions, 6 deletions
diff --git a/docs/sphinx/qapidoc.py b/docs/sphinx/qapidoc.py
index b794cde697..c2f09bac16 100644
--- a/docs/sphinx/qapidoc.py
+++ b/docs/sphinx/qapidoc.py
@@ -258,16 +258,18 @@ class Transmogrifier:
     def visit_returns(self, section: QAPIDoc.Section) -> None:
         assert isinstance(self.entity, QAPISchemaCommand)
         rtype = self.entity.ret_type
-        # q_empty can produce None, but we won't be documenting anything
-        # without an explicit return statement in the doc block, and we
-        # should not have any such explicit statements when there is no
-        # return value.
+        # return statements will not be present (and won't be
+        # autogenerated) for any command that doesn't return
+        # *something*, so rtype will always be defined here.
         assert rtype
 
         typ = self.format_type(rtype)
         assert typ
-        assert section.text
-        self.add_field("return", typ, section.text, section.info)
+
+        if section.text:
+            self.add_field("return", typ, section.text, section.info)
+        else:
+            self.add_lines(f":return-nodesc: {typ}", section.info)
 
     def visit_errors(self, section: QAPIDoc.Section) -> None:
         # If the section text does not start with a space, it means text
diff --git a/qapi/machine.json b/qapi/machine.json
index af00a20b1f..2d6a137f21 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -1303,6 +1303,8 @@
 # Return the amount of initially allocated and present hotpluggable
 # (if enabled) memory in bytes.
 #
+# TODO: This line is a hack to separate the example from the body
+#
 # .. qmp-example::
 #
 #     -> { "execute": "query-memory-size-summary" }
diff --git a/scripts/qapi/parser.py b/scripts/qapi/parser.py
index d43a123cd7..2529edf81a 100644
--- a/scripts/qapi/parser.py
+++ b/scripts/qapi/parser.py
@@ -804,6 +804,43 @@ class QAPIDoc:
                                % feature.name)
         self.features[feature.name].connect(feature)
 
+    def ensure_returns(self, info: QAPISourceInfo) -> None:
+
+        def _insert_near_kind(
+            kind: QAPIDoc.Kind,
+            new_sect: QAPIDoc.Section,
+            after: bool = False,
+        ) -> bool:
+            for idx, sect in enumerate(reversed(self.all_sections)):
+                if sect.kind == kind:
+                    pos = len(self.all_sections) - idx - 1
+                    if after:
+                        pos += 1
+                    self.all_sections.insert(pos, new_sect)
+                    return True
+            return False
+
+        if any(s.kind == QAPIDoc.Kind.RETURNS for s in self.all_sections):
+            return
+
+        # Stub "Returns" section for undocumented returns value
+        stub = QAPIDoc.Section(info, QAPIDoc.Kind.RETURNS)
+
+        if any(_insert_near_kind(kind, stub, after) for kind, after in (
+                # 1. If arguments, right after those.
+                (QAPIDoc.Kind.MEMBER, True),
+                # 2. Elif errors, right *before* those.
+                (QAPIDoc.Kind.ERRORS, False),
+                # 3. Elif features, right *before* those.
+                (QAPIDoc.Kind.FEATURE, False),
+        )):
+            return
+
+        # Otherwise, it should go right after the intro. The intro
+        # is always the first section and is always present (even
+        # when empty), so we can insert directly at index=1 blindly.
+        self.all_sections.insert(1, stub)
+
     def check_expr(self, expr: QAPIExpression) -> None:
         if 'command' in expr:
             if self.returns and 'returns' not in expr:
diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index cbe3b5aa91..3abddea352 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -1062,6 +1062,9 @@ class QAPISchemaCommand(QAPISchemaDefinition):
             if self.arg_type and self.arg_type.is_implicit():
                 self.arg_type.connect_doc(doc)
 
+            if self.ret_type and self.info:
+                doc.ensure_returns(self.info)
+
     def visit(self, visitor: QAPISchemaVisitor) -> None:
         super().visit(visitor)
         visitor.visit_command(