[Qemu-devel] [PATCH v6 08/16] qapi-commands: Utilize implicit struct visits

[Eric Blake <eblake@redhat.com>]

Rather than generate inline per-member visits, take advantage
of the 'visit_type_FOO_members()' function for command
marshalling.  This is possible now that implicit structs can be
visited like any other.  Generate call arguments from a stack-
allocated struct, rather than a list of local variables:

|@@ -57,26 +57,15 @@ void qmp_marshal_add_fd(QDict *args, QOb
|     QmpInputVisitor *qiv = qmp_input_visitor_new_strict(QOBJECT(args));
|     QapiDeallocVisitor *qdv;
|     Visitor *v;
|-    bool has_fdset_id = false;
|-    int64_t fdset_id = 0;
|-    bool has_opaque = false;
|-    char *opaque = NULL;
|+    q_obj_add_fd_arg arg = {0};
|
|     v = qmp_input_get_visitor(qiv);
|-    if (visit_optional(v, "fdset-id", &has_fdset_id)) {
|-        visit_type_int(v, "fdset-id", &fdset_id, &err);
|-        if (err) {
|-            goto out;
|-        }
|-    }
|-    if (visit_optional(v, "opaque", &has_opaque)) {
|-        visit_type_str(v, "opaque", &opaque, &err);
|-        if (err) {
|-            goto out;
|-        }
|+    visit_type_q_obj_add_fd_arg_members(v, &arg, &err);
|+    if (err) {
|+        goto out;
|     }
|
|-    retval = qmp_add_fd(has_fdset_id, fdset_id, has_opaque, opaque, &err);
|+    retval = qmp_add_fd(arg.has_fdset_id, arg.fdset_id, arg.has_opaque, arg.opaque, &err);
|     if (err) {
|         goto out;
|     }
|@@ -88,12 +77,7 @@ out:
|     qmp_input_visitor_cleanup(qiv);
|     qdv = qapi_dealloc_visitor_new();
|     v = qapi_dealloc_get_visitor(qdv);
|-    if (visit_optional(v, "fdset-id", &has_fdset_id)) {
|-        visit_type_int(v, "fdset-id", &fdset_id, NULL);
|-    }
|-    if (visit_optional(v, "opaque", &has_opaque)) {
|-        visit_type_str(v, "opaque", &opaque, NULL);
|-    }
|+    visit_type_q_obj_add_fd_arg_members(v, &arg, NULL);
|     qapi_dealloc_visitor_cleanup(qdv);
| }

This also has the nice side effect of eliminating a chance of
collision between argument QMP names and local variables.

This patch also paves the way for some followup simplifications
in the generator, in subsequent patches.

Signed-off-by: Eric Blake <eblake@redhat.com>

---
v6: split into two patches, s/qapi/arg/
v5: move qapi.py:gen_struct_init() to qapi-event.py:gen_param_var(),
improve commit message
v4: new patch
---
 scripts/qapi-commands.py | 28 ++++++++++++----------------
 1 file changed, 12 insertions(+), 16 deletions(-)

diff --git a/scripts/qapi-commands.py b/scripts/qapi-commands.py
index 3784f33..28b9cbe 100644
--- a/scripts/qapi-commands.py
+++ b/scripts/qapi-commands.py
@@ -33,8 +33,8 @@ def gen_call(name, arg_type, ret_type):
         assert not arg_type.variants
         for memb in arg_type.members:
             if memb.optional:
-                argstr += 'has_%s, ' % c_name(memb.name)
-            argstr += '%s, ' % c_name(memb.name)
+                argstr += 'arg.has_%s, ' % c_name(memb.name)
+            argstr += 'arg.%s, ' % c_name(memb.name)

     lhs = ''
     if ret_type:
@@ -71,21 +71,10 @@ def gen_marshal_vars(arg_type, ret_type):
     QmpInputVisitor *qiv = qmp_input_visitor_new_strict(QOBJECT(args));
     QapiDeallocVisitor *qdv;
     Visitor *v;
-''')
+    %(c_name)s arg = {0};

-        for memb in arg_type.members:
-            if memb.optional:
-                ret += mcgen('''
-    bool has_%(c_name)s = false;
 ''',
-                             c_name=c_name(memb.name))
-            ret += mcgen('''
-    %(c_type)s %(c_name)s = %(c_null)s;
-''',
-                         c_name=c_name(memb.name),
-                         c_type=memb.type.c_type(),
-                         c_null=memb.type.c_null())
-        ret += '\n'
+                     c_name=arg_type.c_name())
     else:
         ret += mcgen('''

@@ -107,17 +96,24 @@ def gen_marshal_input_visit(arg_type, dealloc=False):
     qdv = qapi_dealloc_visitor_new();
     v = qapi_dealloc_get_visitor(qdv);
 ''')
+        errp = 'NULL'
     else:
         ret += mcgen('''
     v = qmp_input_get_visitor(qiv);
 ''')
+        errp = '&err'

-    ret += gen_visit_members(arg_type.members, skiperr=dealloc)
+    ret += mcgen('''
+    visit_type_%(c_name)s_members(v, &arg, %(errp)s);
+''',
+                 c_name=arg_type.c_name(), errp=errp)

     if dealloc:
         ret += mcgen('''
     qapi_dealloc_visitor_cleanup(qdv);
 ''')
+    else:
+        ret += gen_err_check()
     return ret


-- 
2.5.0