[Qemu-devel] [PATCH v3 11/13] qapi: Clean up null checking in generated visitors

[Markus Armbruster <armbru@redhat.com>]

Visitors get passed a pointer to the visited object.  The generated
visitors try to cope with this pointer being null in some places, for
instance like this:

    visit_start_optional(m, obj ? &(*obj)->has_name : NULL, "name", &err);

visit_start_optional() passes its second argument to Visitor method
start_optional.  Three out of three methods dereference it
unconditionally.

I fail to see how hits pointer could legitimately be null.

All this useless null checking is highly redundant, which Coverity
duly reports.  About 200 times.

Remove the useless null checks.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 scripts/qapi-visit.py | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index 97e9b11..c6de9ae 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -47,9 +47,9 @@ static void visit_type_%(full_name)s_fields(Visitor *m, %(name)s ** obj, Error *
 
     if base:
         ret += mcgen('''
-visit_start_implicit_struct(m, obj ? (void**) &(*obj)->%(c_name)s : NULL, sizeof(%(type)s), &err);
+visit_start_implicit_struct(m, (void**) &(*obj)->%(c_name)s, sizeof(%(type)s), &err);
 if (!err) {
-    visit_type_%(type)s_fields(m, obj ? &(*obj)->%(c_prefix)s%(c_name)s : NULL, &err);
+    visit_type_%(type)s_fields(m, &(*obj)->%(c_prefix)s%(c_name)s, &err);
     error_propagate(errp, err);
     err = NULL;
     visit_end_implicit_struct(m, &err);
@@ -61,8 +61,8 @@ if (!err) {
     for argname, argentry, optional, structured in parse_args(members):
         if optional:
             ret += mcgen('''
-visit_start_optional(m, obj ? &(*obj)->%(c_prefix)shas_%(c_name)s : NULL, "%(name)s", &err);
-if (obj && (*obj)->%(prefix)shas_%(c_name)s) {
+visit_start_optional(m, &(*obj)->%(c_prefix)shas_%(c_name)s, "%(name)s", &err);
+if ((*obj)->%(prefix)shas_%(c_name)s) {
 ''',
                          c_prefix=c_var(field_prefix), prefix=field_prefix,
                          c_name=c_var(argname), name=argname)
@@ -72,7 +72,7 @@ if (obj && (*obj)->%(prefix)shas_%(c_name)s) {
             ret += generate_visit_struct_body(full_name, argname, argentry)
         else:
             ret += mcgen('''
-visit_type_%(type)s(m, obj ? &(*obj)->%(c_prefix)s%(c_name)s : NULL, "%(name)s", &err);
+visit_type_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, "%(name)s", &err);
 ''',
                          c_prefix=c_var(field_prefix), prefix=field_prefix,
                          type=type_name(argentry), c_name=c_var(argname),
@@ -121,7 +121,7 @@ visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
 
     ret += mcgen('''
 if (!err) {
-    if (!obj || *obj) {
+    if (*obj) {
         visit_type_%(name)s_fields(m, obj, &err);
         error_propagate(errp, err);
         err = NULL;
@@ -273,7 +273,7 @@ void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **
     if (!error_is_set(errp)) {
         visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
         if (!err) {
-            if (obj && *obj) {
+            if (*obj) {
 ''',
                  name=name)
 
-- 
1.8.1.4