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[Qemu-devel] [PATCH RFC v2 45/47] qapi: New QMP command query-schema for


From: Markus Armbruster
Subject: [Qemu-devel] [PATCH RFC v2 45/47] qapi: New QMP command query-schema for QMP schema introspection
Date: Wed, 1 Jul 2015 22:22:33 +0200

Caution, rough edges.

qapi/introspect.json defines the introspection schema.  It should do
for uses other than QMP.
FIXME it's almost entirely devoid of comments.

The introspection schema does not reflect all the rules and
restrictions that apply to QAPI schemata.  A valid QAPI schema has an
introspection value conforming to the introspection schema, but the
converse is not true.

Introspection lowers away a number of schema details:

* The built-in types are declared with their JSON type.

  TODO Should we map all the integer types to just int?

* Implicit type definitions are made explicit, and given
  auto-generated names.  These names start with ':' so they don't
  clash with the user's names.

  Example: a simple union implicitly defines an enumeration type for
  its discriminator.

* All type references are by name.

* Base types are flattened.

* The top type (named 'any') can hold any value.

* The struct and union types are generalized into an object type.

* Commands take a single argument and return a single result.

  Dictionary argument/result or list result is an implicit type
  definition.

  The empty object type is used when a command takes no arguments or
  produces no results.

  The argument is always of object type, but the introspection schema
  doesn't reflect that.

  The 'gen': false and 'success-response': false directives are
  omitted as implementation detail.

* Events carry a single data value.

  Implicit type definition and empty object type use, just like for
  commands.

  The value is of object type, but the introspection schema doesn't
  reflect that.

* Types not used by commands or events are omitted.

  Indirect use counts as use.

* Optional members have a default, which can only be null right now

  Instead of a mandatory "optional" flag, we have an optional default.
  No default means mandatory, default null means optional without
  default value.  Non-null is available for optional with default.

  Alternate members can't have defaults, but the introspection schema
  doesn't reflect that.

* Clients should *not* look up types by name, because type names are
  not ABI.  Look up the command or event you're interested in, then
  follow the references.

  TODO Should we hide the type names to eliminate the temptation?

* Likewise, the names of alternate members are not ABI, and should not
  be examined.

  TODO Should we hide them, too?

TODO much of the above should go into docs.

New generator scripts/qapi-introspect.py computes an introspection
value for its input, and generates a C variable holding it.

FIXME it can generate awfully long lines

A new test-qmp-input-visitor test case feeds its result for both
tests/qapi-schema/qapi-schema-test.json and qapi-schema.json to a
QmpInputVisitor to verify it actually conforms to the schema.

New QMP command query-schema takes its return value from that
variable.  Command documentation is incomplete, and marked FIXME.  Its
reply is some 80KiBytes for me right now.

If this turns out to be too much, we have a couple of options:

* We can use shorter names in the JSON.  Not the QMP style.

* Optionally return the sub-schema for commands and events given as
  arguments.

  Right now qmp_query_schema() sends the string literal computed by
  qmp-introspect.py.  To compute sub-schema at run time, we'd have to
  duplicate parts of qapi-introspect.py in C.  Unattractive.

* Let clients cache the output of query-schema.

  It changes only on QEMU upgrades, i.e. rarely.  Provide a command
  query-schema-hash.  Clients can have a cache indexed by hash, and
  re-query the schema only when they don't have it cached.

Signed-off-by: Markus Armbruster <address@hidden>
---
 .gitignore                                      |   1 +
 Makefile                                        |   9 +-
 Makefile.objs                                   |   4 +-
 monitor.c                                       |  15 +++
 qapi-schema.json                                |   3 +
 qapi/introspect.json                            |  69 ++++++++++
 qmp-commands.hx                                 |  16 +++
 scripts/qapi-commands.py                        |   5 +-
 scripts/qapi-event.py                           |   3 +-
 scripts/qapi-introspect.py                      | 159 ++++++++++++++++++++++++
 scripts/qapi-types.py                           |   1 -
 scripts/qapi-visit.py                           |   2 +-
 scripts/qapi.py                                 |  14 ++-
 tests/.gitignore                                |   1 +
 tests/Makefile                                  |  10 +-
 tests/qapi-schema/alternate-good.out            |   1 +
 tests/qapi-schema/comments.out                  |   1 +
 tests/qapi-schema/data-member-array.out         |   1 +
 tests/qapi-schema/empty.out                     |   1 +
 tests/qapi-schema/enum-empty.out                |   1 +
 tests/qapi-schema/event-case.out                |   1 +
 tests/qapi-schema/flat-union-reverse-define.out |   1 +
 tests/qapi-schema/ident-with-escape.out         |   1 +
 tests/qapi-schema/include-relpath.out           |   1 +
 tests/qapi-schema/include-repetition.out        |   1 +
 tests/qapi-schema/include-simple.out            |   1 +
 tests/qapi-schema/indented-expr.out             |   1 +
 tests/qapi-schema/qapi-schema-test.out          |   1 +
 tests/qapi-schema/returns-int.out               |   1 +
 tests/test-qmp-input-visitor.c                  |  31 +++++
 30 files changed, 345 insertions(+), 12 deletions(-)
 create mode 100644 qapi/introspect.json
 create mode 100644 scripts/qapi-introspect.py

diff --git a/.gitignore b/.gitignore
index aed0e1f..a6a02db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,6 +32,7 @@
 /qapi-visit.[ch]
 /qapi-event.[ch]
 /qmp-commands.h
+/qmp-introspect.[ch]
 /qmp-marshal.c
 /qemu-doc.html
 /qemu-tech.html
diff --git a/Makefile b/Makefile
index c9be643..a91afd0 100644
--- a/Makefile
+++ b/Makefile
@@ -52,6 +52,8 @@ endif
 GENERATED_HEADERS = config-host.h qemu-options.def
 GENERATED_HEADERS += qmp-commands.h qapi-types.h qapi-visit.h qapi-event.h
 GENERATED_SOURCES += qmp-marshal.c qapi-types.c qapi-visit.c qapi-event.c
+GENERATED_HEADERS += qmp-introspect.h
+GENERATED_SOURCES += qmp-introspect.c
 
 GENERATED_HEADERS += trace/generated-events.h
 GENERATED_SOURCES += trace/generated-events.c
@@ -263,7 +265,7 @@ $(SRC_PATH)/qga/qapi-schema.json 
$(SRC_PATH)/scripts/qapi-commands.py $(qapi-py)
 
 qapi-modules = $(SRC_PATH)/qapi-schema.json $(SRC_PATH)/qapi/common.json \
                $(SRC_PATH)/qapi/block.json $(SRC_PATH)/qapi/block-core.json \
-               $(SRC_PATH)/qapi/event.json
+               $(SRC_PATH)/qapi/event.json $(SRC_PATH)/qapi/introspect.json
 
 qapi-types.c qapi-types.h :\
 $(qapi-modules) $(SRC_PATH)/scripts/qapi-types.py $(qapi-py)
@@ -285,6 +287,11 @@ $(qapi-modules) $(SRC_PATH)/scripts/qapi-commands.py 
$(qapi-py)
        $(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-commands.py \
                $(gen-out-type) -o "." -m $<, \
                "  GEN   $@")
+qmp-introspect.h qmp-introspect.c :\
+$(qapi-modules) $(SRC_PATH)/scripts/qapi-introspect.py $(qapi-py)
+       $(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-introspect.py \
+               $(gen-out-type) -o "." $<, \
+               "  GEN   $@")
 
 QGALIB_GEN=$(addprefix qga/qapi-generated/, qga-qapi-types.h qga-qapi-visit.h 
qga-qmp-commands.h)
 $(qga-obj-y) qemu-ga.o: $(QGALIB_GEN)
diff --git a/Makefile.objs b/Makefile.objs
index 4881d2c..1214a5e 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -1,7 +1,8 @@
 #######################################################################
 # Common libraries for tools and emulators
 stub-obj-y = stubs/
-util-obj-y = util/ qobject/ qapi/ qapi-types.o qapi-visit.o qapi-event.o
+util-obj-y = util/ qobject/ qapi/
+util-obj-y += qmp-introspect.o qapi-types.o qapi-visit.o qapi-event.o
 
 #######################################################################
 # block-obj-y is code used by both qemu system emulation and qemu-img
@@ -82,6 +83,7 @@ common-obj-$(CONFIG_FDT) += device_tree.o
 # qapi
 
 common-obj-y += qmp-marshal.o
+common-obj-y += qmp-introspect.o
 common-obj-y += qmp.o hmp.o
 endif
 
diff --git a/monitor.c b/monitor.c
index 16672f1..0c71526 100644
--- a/monitor.c
+++ b/monitor.c
@@ -74,6 +74,7 @@
 #include "block/qapi.h"
 #include "qapi/qmp-event.h"
 #include "qapi-event.h"
+#include "qmp-introspect.h"
 #include "sysemu/block-backend.h"
 
 /* for hmp_info_irq/pic */
@@ -924,6 +925,20 @@ EventInfoList *qmp_query_events(Error **errp)
     return ev_list;
 }
 
+/*
+ * Minor hack: generated marshalling suppressed for this command
+ * ('gen': false in the schema) so we can simply send the JSON string
+ * instead of first parsing it with visit_type_SchemaInfoList() into a
+ * SchemaInfoList, then unparse it right back in the generated output
+ * marshaller, every time.
+ * Instead, we do it in test-qmp-input-visitor.c, just to make sure
+ * qapi-introspect.py's output actually conforms to the schema.
+ */
+static void qmp_query_schema(QDict *qdict, QObject **ret_data, Error **errp)
+{
+    *ret_data = qobject_from_json(qmp_schema_json);
+}
+
 /* set the current CPU defined by the user */
 int monitor_set_cpu(int cpu_index)
 {
diff --git a/qapi-schema.json b/qapi-schema.json
index e246acb..7a3b8a0 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -14,6 +14,9 @@
 # Tracing commands
 { 'include': 'qapi/trace.json' }
 
+# QAPI introspection
+{ 'include': 'qapi/introspect.json' }
+
 ##
 # LostTickPolicy:
 #
diff --git a/qapi/introspect.json b/qapi/introspect.json
new file mode 100644
index 0000000..673df56
--- /dev/null
+++ b/qapi/introspect.json
@@ -0,0 +1,69 @@
+# -*- Mode: Python -*-
+#
+# QAPI introspection
+#
+# Copyright (C) 2015 Red Hat, Inc.
+#
+# Authors:
+#  Markus Armbruster <address@hidden>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+
+{ 'enum': 'SchemaMetaType',
+  'data': [ 'builtin', 'enum', 'array', 'object', 'alternate',
+            'command', 'event' ] }
+
+{ 'struct': 'SchemaInfoBase',
+  'data': { 'name': 'str', 'meta-type': 'SchemaMetaType' } }
+
+{ 'enum': 'JSONType',
+  'data': [ 'string', 'number', 'int', 'boolean', 'null',
+            'object', 'array', 'value' ] }
+
+{ 'struct': 'SchemaInfoBuiltin',
+  'data': { 'json-type': 'JSONType' } }
+
+{ 'struct': 'SchemaInfoEnum',
+  'data': { 'values': ['str'] } }
+
+{ 'struct': 'SchemaInfoArray',
+  'data': { 'element-type': 'str' } }
+
+{ 'struct': 'SchemaInfoObjectMember',
+  'data': { 'name': 'str', 'type': 'str', '*default': 'any' } }
+# @default's type must match @type
+
+{ 'struct': 'SchemaInfoObjectVariant',
+  'data': { 'case': 'str',
+            'members': [ 'SchemaInfoObjectMember' ] } }
+
+{ 'struct': 'SchemaInfoObject',
+  'data': { 'members': [ 'SchemaInfoObjectMember' ],
+            '*tag': 'str',
+            '*variants': [ 'SchemaInfoObjectVariant' ] } }
+
+{ 'struct': 'SchemaInfoAlternate',
+  'data': { 'members': [ 'SchemaInfoObjectMember' ] } }
+
+{ 'struct': 'SchemaInfoCommand',
+  'data': { 'args': 'str', 'returns': 'str' } }
+
+{ 'struct': 'SchemaInfoEvent',
+  'data': { 'data': 'str' } }
+
+{ 'union': 'SchemaInfo',
+  'base': 'SchemaInfoBase',
+  'discriminator': 'meta-type',
+  'data': {
+      'builtin': 'SchemaInfoBuiltin',
+      'enum': 'SchemaInfoEnum',
+      'array': 'SchemaInfoArray',
+      'object': 'SchemaInfoObject',
+      'alternate': 'SchemaInfoAlternate',
+      'command': 'SchemaInfoCommand',
+      'event': 'SchemaInfoEvent' } }
+
+{ 'command': 'query-schema',
+  'returns': [ 'SchemaInfo' ],
+  'gen': false }                # just to simplify qmp_query_json()
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 351173e..31a3f57 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -2165,6 +2165,22 @@ EQMP
     },
 
 SQMP
+query-schema
+------------
+
+Return the QMP schema.
+
+FIXME explain
+
+EQMP
+
+    {
+        .name       = "query-schema",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_query_schema,
+    },
+
+SQMP
 query-chardev
 -------------
 
diff --git a/scripts/qapi-commands.py b/scripts/qapi-commands.py
index fcbb7d0..eef4401 100644
--- a/scripts/qapi-commands.py
+++ b/scripts/qapi-commands.py
@@ -265,7 +265,7 @@ class QAPISchemaGenCommandVisitor(QAPISchemaVisitor):
         self.defn = None
         self.regy = None
         self.visited_rets = None
-    def visit_begin(self):
+    def visit_begin(self, schema):
         self.decl = ''
         self.defn = ''
         self.regy = ''
@@ -273,7 +273,8 @@ class QAPISchemaGenCommandVisitor(QAPISchemaVisitor):
     def visit_end(self):
         if not middle_mode:
             self.defn += gen_registry(self.regy)
-            self.regy = None
+        self.regy = None
+        self.visited_rets = None
     def visit_command(self, name, info, args, rets, gen, success_response):
         if not gen:
             return
diff --git a/scripts/qapi-event.py b/scripts/qapi-event.py
index 184a81f..71da7a9 100644
--- a/scripts/qapi-event.py
+++ b/scripts/qapi-event.py
@@ -139,13 +139,14 @@ class QAPISchemaGenEventVisitor(QAPISchemaVisitor):
         self.decl = None
         self.defn = None
         self.event_names = None
-    def visit_begin(self):
+    def visit_begin(self, schema):
         self.decl = ''
         self.defn = ''
         self.event_names = []
     def visit_end(self):
         self.decl += gen_enum(event_enum_name, self.event_names)
         self.defn += gen_enum_lookup(event_enum_name, self.event_names)
+        self.event_names = None
     def visit_event(self, name, info, data):
         self.decl += gen_event_send_decl(name, data)
         self.defn += gen_event_send(name, data)
diff --git a/scripts/qapi-introspect.py b/scripts/qapi-introspect.py
new file mode 100644
index 0000000..e7efc4a
--- /dev/null
+++ b/scripts/qapi-introspect.py
@@ -0,0 +1,159 @@
+#
+# QAPI introspection generator
+#
+# Copyright (C) 2015 Red Hat, Inc.
+#
+# Authors:
+#  Markus Armbruster <address@hidden>
+#
+# This work is licensed under the terms of the GNU GPL, version 2.
+# See the COPYING file in the top-level directory.
+
+from qapi import *
+
+class QAPISchemaGenIntrospectVisitor(QAPISchemaVisitor):
+    def __init__(self):
+        self.schema = None
+        self.jsons = None
+        self.used_types = None
+        self.defn = None
+        self.decl = None
+
+    def visit_begin(self, schema):
+        self.schema = schema
+        self.jsons = []
+        self.used_types = []
+        return QAPISchemaType   # don't visit types for now
+
+    def visit_end(self):
+        # visit the types that are actually used
+        for typ in self.used_types:
+            typ.visit(self)
+        self.jsons.sort()
+        name = prefix + 'qmp_schema_json'
+        self.decl = mcgen('''
+extern char %(c_name)s[];
+''',
+                          c_name=c_name(name))
+        self.defn = mcgen('''
+char %(c_name)s[] = "["
+    "%(c_jsons)s]";
+''',
+                          c_name=c_name(name),
+                          c_jsons=', "\n    "'.join(self.jsons))
+        self.schema = None
+        self.jsons = None
+        self.used_types = None
+
+    def _use_type(self, typ):
+        if typ not in self.used_types:
+            self.used_types.append(typ)
+        return typ.name
+
+    def _gen_json(self, name, mtype, extra):
+        self.jsons.append("{ 'name': '%s', 'meta-type': '%s', %s }"
+                          % (name, mtype, extra))
+
+    def _gen_members(self, members):
+        return ("'members': [ "
+                + ", ".join([self._gen_member(m) for m in members])
+                + " ]")
+
+    def _gen_member(self, member):
+        default = ''
+        if member.optional:
+            default = ", 'default': null"
+        return "{ 'name': '%s', 'type': '%s'%s }" \
+            % (member.name, self._use_type(member.type), default)
+
+    def _gen_variants(self, tag_name, variants):
+        return ("'tag': '%s'" % tag_name
+                + ", 'variants': [ "
+                + ", ".join([self._gen_variant(v) for v in variants])
+                + " ]")
+
+    def _gen_variant(self, variant):
+        if variant.flat:
+            members = self._gen_members(variant.type.members)
+        else:
+            members = "'members': [ { 'name': 'data', 'type': '%s' } ]" \
+                      % self._use_type(variant.type)
+        return "{ 'case': '%s', %s }" % (variant.name, members)
+
+    def visit_builtin_type(self, name, info, json_type):
+        self._gen_json(name, 'builtin',
+                       "'json-type': '%s'" % json_type)
+
+    def visit_enum_type(self, name, info, values):
+        self._gen_json(name, 'enum',
+                       "'values': [ %s ]" % ", ".join(["'%s'" % v
+                                                       for v in values]))
+
+    def visit_array_type(self, name, info, element_type):
+        self._gen_json(name, 'array',
+                       "'element-type': '%s'" % self._use_type(element_type))
+
+    def visit_object_type_flat(self, name, info, members, variants):
+        extra = self._gen_members(members)
+        if variants:
+            extra += ", " + self._gen_variants(variants.tag_name or "type",
+                                               variants.variants)
+        self._gen_json(name, 'object', extra)
+
+    def visit_alternate_type(self, name, info, variants):
+        self._gen_json(name, 'alternate',
+                       self._gen_members(variants.variants))
+
+    def visit_command(self, name, info, args, rets, gen, success_response):
+        args = args or self.schema.the_empty_object_type
+        rets = rets or self.schema.the_empty_object_type
+        self._gen_json(name, 'command',
+                       "'args': '%s', 'returns': '%s'" \
+                       % (self._use_type(args), self._use_type(rets)))
+
+    def visit_event(self, name, info, data):
+        data = data or self.schema.the_empty_object_type
+        self._gen_json(name, 'event', "'data': '%s'" % self._use_type(data))
+
+(input_file, output_dir, do_c, do_h, prefix, dummy) = parse_command_line()
+
+c_comment = '''
+/*
+ * QAPI/QMP schema introspection
+ *
+ * Copyright (C) 2015 Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+'''
+h_comment = '''
+/*
+ * QAPI/QMP schema introspection
+ *
+ * Copyright (C) 2015 Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+'''
+
+(fdef, fdecl) = open_output(output_dir, do_c, do_h, prefix,
+                            'qmp-introspect.c', 'qmp-introspect.h',
+                            c_comment, h_comment)
+
+fdef.write(mcgen('''
+#include "%(prefix)sqmp-introspect.h"
+
+''',
+                 prefix=prefix))
+
+schema = QAPISchema(input_file)
+gen = QAPISchemaGenIntrospectVisitor()
+schema.visit(gen)
+fdef.write(gen.defn)
+fdecl.write(gen.decl)
+
+close_output(fdef, fdecl)
diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
index 7c403c0..12f3767 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi-types.py
@@ -184,7 +184,6 @@ class QAPISchemaGenTypeVisitor(QAPISchemaVisitor):
         self.fwdecl = None
         self.fwdefn = None
         self.btin = None
-    def visit_begin(self):
         self.decl = ''
         self.defn = ''
         self.fwdecl = ''
diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index 2813bb3..7a03292 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -326,7 +326,7 @@ class QAPISchemaGenVisitVisitor(QAPISchemaVisitor):
         self.decl = None
         self.defn = None
         self.btin = None
-    def visit_begin(self):
+    def visit_begin(self, schema):
         self.decl = ''
         self.defn = ''
         self.btin = guardstart('QAPI_VISIT_BUILTIN_VISITOR_DECL')
diff --git a/scripts/qapi.py b/scripts/qapi.py
index 6ddb33e..7f9a159 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -764,7 +764,7 @@ class QAPISchemaEntity(object):
         pass
 
 class QAPISchemaVisitor(object):
-    def visit_begin(self):
+    def visit_begin(self, schema):
         pass
     def visit_end(self):
         pass
@@ -776,6 +776,8 @@ class QAPISchemaVisitor(object):
         pass
     def visit_object_type(self, name, info, base, members, variants):
         pass
+    def visit_object_type_flat(self, name, info, members, variants):
+        pass
     def visit_alternate_type(self, name, info, variants):
         pass
     def visit_command(self, name, info, args, rets, gen, success_response):
@@ -892,6 +894,8 @@ class QAPISchemaObjectType(QAPISchemaType):
     def visit(self, visitor):
         visitor.visit_object_type(self.name, self.info,
                                   self.base, self.local_members, self.variants)
+        visitor.visit_object_type_flat(self.name, self.info,
+                                       self.members, self.variants)
 
 class QAPISchemaObjectTypeMember(object):
     def __init__(self, name, typ, optional):
@@ -1042,6 +1046,9 @@ class QAPISchema(object):
                   ('bool',   'boolean', 'bool',     'false'),
                   ('any',    'value',   'QObject' + pointer_suffix , 'NULL')]:
             self._def_builtin_type(*t)
+        self.the_empty_object_type = QAPISchemaObjectType(':empty', None, None,
+                                                          [], None)
+        self._def_entity(self.the_empty_object_type)
 
     def _make_implicit_enum_type(self, name, values):
         name = name + 'Kind'
@@ -1180,9 +1187,10 @@ class QAPISchema(object):
             ent.check(self)
 
     def visit(self, visitor):
-        visitor.visit_begin()
+        ignore = visitor.visit_begin(self)
         for name in sorted(self.entity_dict.keys()):
-            self.entity_dict[name].visit(visitor)
+            if not ignore or not isinstance(self.entity_dict[name], ignore):
+                self.entity_dict[name].visit(visitor)
         visitor.visit_end()
 
 #
diff --git a/tests/.gitignore b/tests/.gitignore
index dc813c2..dda86cc 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -19,6 +19,7 @@ test-opts-visitor
 test-qapi-event.[ch]
 test-qapi-types.[ch]
 test-qapi-visit.[ch]
+test-qapi-introspect.[ch]
 test-qdev-global-props
 test-qemu-opts
 test-qmp-commands
diff --git a/tests/Makefile b/tests/Makefile
index 60b82e2..7b1bf92 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -253,7 +253,8 @@ check-qapi-schema-y := $(addprefix tests/qapi-schema/, \
        struct-base-clash.json struct-base-clash-deep.json )
 
 GENERATED_HEADERS += tests/test-qapi-types.h tests/test-qapi-visit.h \
-                    tests/test-qmp-commands.h tests/test-qapi-event.h
+       tests/test-qmp-commands.h tests/test-qapi-event.h \
+       tests/test-qmp-introspect.h
 
 test-obj-y = tests/check-qint.o tests/check-qstring.o tests/check-qdict.o \
        tests/check-qlist.o tests/check-qfloat.o tests/check-qjson.o \
@@ -266,7 +267,7 @@ test-obj-y = tests/check-qint.o tests/check-qstring.o 
tests/check-qdict.o \
        tests/rcutorture.o tests/test-rcu-list.o
 
 test-qapi-obj-y = tests/test-qapi-visit.o tests/test-qapi-types.o \
-                 tests/test-qapi-event.o
+                 tests/test-qapi-event.o tests/test-qmp-introspect.o
 
 $(test-obj-y): QEMU_INCLUDES += -Itests
 QEMU_CFLAGS += -I$(SRC_PATH)/tests
@@ -327,6 +328,11 @@ $(SRC_PATH)/tests/qapi-schema/qapi-schema-test.json 
$(SRC_PATH)/scripts/qapi-eve
        $(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-event.py \
                $(gen-out-type) -o tests -p "test-" $<, \
                "  GEN   $@")
+tests/test-qmp-introspect.c tests/test-qmp-introspect.h :\
+$(SRC_PATH)/tests/qapi-schema/qapi-schema-test.json 
$(SRC_PATH)/scripts/qapi-introspect.py $(qapi-py)
+       $(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi-introspect.py \
+               $(gen-out-type) -o tests -p "test-" $<, \
+               "  GEN   $@")
 
 tests/test-string-output-visitor$(EXESUF): tests/test-string-output-visitor.o 
$(test-qapi-obj-y) libqemuutil.a libqemustub.a
 tests/test-string-input-visitor$(EXESUF): tests/test-string-input-visitor.o 
$(test-qapi-obj-y) libqemuutil.a libqemustub.a
diff --git a/tests/qapi-schema/alternate-good.out 
b/tests/qapi-schema/alternate-good.out
index 0cbdfa1..aede1ae 100644
--- a/tests/qapi-schema/alternate-good.out
+++ b/tests/qapi-schema/alternate-good.out
@@ -1,3 +1,4 @@
+object :empty
 alternate Alt
     case value: int flat=False
     case string: Enum flat=False
diff --git a/tests/qapi-schema/comments.out b/tests/qapi-schema/comments.out
index 6161b90..9e2c656 100644
--- a/tests/qapi-schema/comments.out
+++ b/tests/qapi-schema/comments.out
@@ -1 +1,2 @@
+object :empty
 enum Status ['good', 'bad', 'ugly']
diff --git a/tests/qapi-schema/data-member-array.out 
b/tests/qapi-schema/data-member-array.out
index 8911179..d72ce48 100644
--- a/tests/qapi-schema/data-member-array.out
+++ b/tests/qapi-schema/data-member-array.out
@@ -1,3 +1,4 @@
+object :empty
 object :obj-okay-args
     member member1: intList optional=False
     member member2: defList optional=False
diff --git a/tests/qapi-schema/empty.out b/tests/qapi-schema/empty.out
index e69de29..272b161 100644
--- a/tests/qapi-schema/empty.out
+++ b/tests/qapi-schema/empty.out
@@ -0,0 +1 @@
+object :empty
diff --git a/tests/qapi-schema/enum-empty.out b/tests/qapi-schema/enum-empty.out
index e09b00f..a449d45 100644
--- a/tests/qapi-schema/enum-empty.out
+++ b/tests/qapi-schema/enum-empty.out
@@ -1 +1,2 @@
+object :empty
 enum MyEnum []
diff --git a/tests/qapi-schema/event-case.out b/tests/qapi-schema/event-case.out
index b5ae4c2..cdfd264 100644
--- a/tests/qapi-schema/event-case.out
+++ b/tests/qapi-schema/event-case.out
@@ -1 +1,2 @@
+object :empty
 event oops None
diff --git a/tests/qapi-schema/flat-union-reverse-define.out 
b/tests/qapi-schema/flat-union-reverse-define.out
index e156202..1c30867 100644
--- a/tests/qapi-schema/flat-union-reverse-define.out
+++ b/tests/qapi-schema/flat-union-reverse-define.out
@@ -1,3 +1,4 @@
+object :empty
 object TestBase
     member enum1: TestEnum optional=False
 enum TestEnum ['value1', 'value2']
diff --git a/tests/qapi-schema/ident-with-escape.out 
b/tests/qapi-schema/ident-with-escape.out
index 24abf5c..cbb16d6 100644
--- a/tests/qapi-schema/ident-with-escape.out
+++ b/tests/qapi-schema/ident-with-escape.out
@@ -1,3 +1,4 @@
+object :empty
 object :obj-fooA-args
     member bar1: str optional=False
 command fooA :obj-fooA-args -> None
diff --git a/tests/qapi-schema/include-relpath.out 
b/tests/qapi-schema/include-relpath.out
index 6161b90..9e2c656 100644
--- a/tests/qapi-schema/include-relpath.out
+++ b/tests/qapi-schema/include-relpath.out
@@ -1 +1,2 @@
+object :empty
 enum Status ['good', 'bad', 'ugly']
diff --git a/tests/qapi-schema/include-repetition.out 
b/tests/qapi-schema/include-repetition.out
index 6161b90..9e2c656 100644
--- a/tests/qapi-schema/include-repetition.out
+++ b/tests/qapi-schema/include-repetition.out
@@ -1 +1,2 @@
+object :empty
 enum Status ['good', 'bad', 'ugly']
diff --git a/tests/qapi-schema/include-simple.out 
b/tests/qapi-schema/include-simple.out
index 6161b90..9e2c656 100644
--- a/tests/qapi-schema/include-simple.out
+++ b/tests/qapi-schema/include-simple.out
@@ -1 +1,2 @@
+object :empty
 enum Status ['good', 'bad', 'ugly']
diff --git a/tests/qapi-schema/indented-expr.out 
b/tests/qapi-schema/indented-expr.out
index c5af55a..226d300 100644
--- a/tests/qapi-schema/indented-expr.out
+++ b/tests/qapi-schema/indented-expr.out
@@ -1,3 +1,4 @@
+object :empty
 command eins None -> None
    gen=True success_response=True
 command zwei None -> None
diff --git a/tests/qapi-schema/qapi-schema-test.out 
b/tests/qapi-schema/qapi-schema-test.out
index 921d7fb..8a12d51 100644
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -1,3 +1,4 @@
+object :empty
 object :obj-EVENT_C-data
     member a: int optional=True
     member b: UserDefOne optional=True
diff --git a/tests/qapi-schema/returns-int.out 
b/tests/qapi-schema/returns-int.out
index 1ac3e1e..a2da259 100644
--- a/tests/qapi-schema/returns-int.out
+++ b/tests/qapi-schema/returns-int.out
@@ -1,2 +1,3 @@
+object :empty
 command guest-get-time None -> int
    gen=True success_response=True
diff --git a/tests/test-qmp-input-visitor.c b/tests/test-qmp-input-visitor.c
index 9c4bfdf..0f9978b 100644
--- a/tests/test-qmp-input-visitor.c
+++ b/tests/test-qmp-input-visitor.c
@@ -17,6 +17,9 @@
 #include "qapi/qmp-input-visitor.h"
 #include "test-qapi-types.h"
 #include "test-qapi-visit.h"
+#include "test-qmp-introspect.h"
+#include "qmp-introspect.h"
+#include "qapi-visit.h"
 #include "qapi/qmp/types.h"
 
 typedef struct TestInputVisitorData {
@@ -660,6 +663,31 @@ static void 
test_visitor_in_native_list_number(TestInputVisitorData *data,
     qapi_free_UserDefNativeListUnion(cvalue);
 }
 
+static void do_test_visitor_in_qmp_introspect(TestInputVisitorData *data,
+                                              const char *schema_json)
+{
+    SchemaInfoList *schema = NULL;
+    Error *err = NULL;
+    Visitor *v;
+
+    v = visitor_input_test_init_raw(data, schema_json);
+
+    visit_type_SchemaInfoList(v, &schema, NULL, &err);
+    if (err)
+        fprintf(stderr, "%s", error_get_pretty(err));
+    g_assert(!err);
+    g_assert(schema);
+
+    qapi_free_SchemaInfoList(schema);
+}
+
+static void test_visitor_in_qmp_introspect(TestInputVisitorData *data,
+                                           const void *unused)
+{
+    do_test_visitor_in_qmp_introspect(data, test_qmp_schema_json);
+    do_test_visitor_in_qmp_introspect(data, qmp_schema_json);
+}
+
 static void input_visitor_test_add(const char *testpath,
                                    TestInputVisitorData *data,
                                    void (*test_func)(TestInputVisitorData 
*data, const void *user_data))
@@ -753,6 +781,9 @@ int main(int argc, char **argv)
     input_visitor_test_add("/visitor/input/native_list/number",
                            &in_visitor_data,
                            test_visitor_in_native_list_number);
+    input_visitor_test_add("/visitor/input/qmp_introspect",
+                           &in_visitor_data,
+                           test_visitor_in_qmp_introspect);
 
     g_test_run();
 
-- 
1.9.3




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