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qapi-commands: Utilize implicit struct visits

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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>
Message-Id: <1458254921-17042-9-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2016-03-17 16:48:33 -06:00 committed by Markus Armbruster
parent 0949e95b48
commit 386230a249
1 changed files with 12 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
scripts/qapi-commands.py
View file

@ -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