[Qemu-devel] [PATCH RFC v5 31/32] qapi-introspect: Map all integer types to 'int'

[Markus Armbruster <armbru@redhat.com>]

How many bits we use internally is an implementation detail.  It could
be pressed into external interface service as very approximate range
information, but that's probably a bad idea.  If we need range
information, we better do it properly.

Reduces output of query-schema by a negligible 0.5 out of 85KiB.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 docs/qapi-code-gen.txt     | 11 ++++++++---
 scripts/qapi-introspect.py |  7 +++++++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/docs/qapi-code-gen.txt b/docs/qapi-code-gen.txt
index 893a6f6..458b217 100644
--- a/docs/qapi-code-gen.txt
+++ b/docs/qapi-code-gen.txt
@@ -668,14 +668,19 @@ Example: the SchemaInfo for MyEnum from section Enumeration types
       "values": [ "value1", "value2", "value3" ] }
 
 The SchemaInfo for a built-in type has the same name as the type in
-the QAPI schema (see section Built-in Types).  It has variant member
-"json-type" that shows how values of this type are encoded on the
-wire.
+the QAPI schema (see section Built-in Types), with one exception
+detailed below.  It has variant member "json-type" that shows how
+values of this type are encoded on the wire.
 
 Example: the SchemaInfo for str
 
     { "name": "str", "meta-type": "builtin", "json-type": "string" }
 
+The QAPI schema supports a number of integer types that only differ in
+how they map to C.  They are identical as far as SchemaInfo is
+concerned.  Therefore, they get all mapped to a single type "int" in
+SchemaInfo.
+
 As explained above, type names are not part of the wire ABI.  Not even
 the names of built-in types.  Clients should examine member
 "json-type" instead of hard-coding names of built-in types.
diff --git a/scripts/qapi-introspect.py b/scripts/qapi-introspect.py
index 754f263..1bc26f0 100644
--- a/scripts/qapi-introspect.py
+++ b/scripts/qapi-introspect.py
@@ -77,6 +77,13 @@ const char %(c_name)s[] = %(c_string)s;
         self._used_types = None
 
     def _use_type(self, typ):
+        # Map the various integer types to plain int
+        if typ.json_type() == 'int':
+            typ = self._schema.lookup_type('int')
+        elif (isinstance(typ, QAPISchemaArrayType) and
+              typ.element_type.json_type() == 'int'):
+            typ = self._schema.lookup_type('intList')
+        # Add type to work queue if new
         if typ not in self._used_types:
             self._used_types.append(typ)
         return typ.name
-- 
2.4.3