None of the visitor callbacks would set an error when testing
if an optional field was present; make this part of the interface
contract by eliminating the errp argument.
The resulting generated code has a nice diff:
|- visit_optional(v, &has_fdset_id, "fdset-id", &err);
|- if (err) {
|- goto out;
|- }
|+ visit_optional(v, &has_fdset_id, "fdset-id");
| if (has_fdset_id) {
| visit_type_int(v, &fdset_id, "fdset-id", &err);
| if (err) {
| goto out;
| }
| }
Signed-off-by: Eric Blake <ebl...@redhat.com>
---
v13: commit message tweak
v12: split error removal from 'if' compression
v11 (no v10): no change
v9: no change
v8: no change
v7: rebase to no member.c_name()
v6: rebase onto earlier testsuite and gen_err_check() improvements
---
include/qapi/visitor-impl.h | 5 ++---
include/qapi/visitor.h | 10 ++++++++--
qapi/opts-visitor.c | 2 +-
qapi/qapi-visit-core.c | 5 ++---
qapi/qmp-input-visitor.c | 3 +--
qapi/string-input-visitor.c | 3 +--
scripts/qapi.py | 8 ++------
7 files changed, 17 insertions(+), 19 deletions(-)
diff --git a/include/qapi/visitor-impl.h b/include/qapi/visitor-impl.h
index 7419684..44a21b7 100644
--- a/include/qapi/visitor-impl.h
+++ b/include/qapi/visitor-impl.h
@@ -44,9 +44,8 @@ struct Visitor
void (*type_any)(Visitor *v, QObject **obj, const char *name,
Error **errp);
- /* May be NULL */
- void (*optional)(Visitor *v, bool *present, const char *name,
- Error **errp);
+ /* May be NULL; most useful for input visitors. */
+ void (*optional)(Visitor *v, bool *present, const char *name);
void (*type_uint8)(Visitor *v, uint8_t *obj, const char *name, Error
**errp);
void (*type_uint16)(Visitor *v, uint16_t *obj, const char *name, Error
**errp);
diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h
index 1414de1..9be60d4 100644
--- a/include/qapi/visitor.h
+++ b/include/qapi/visitor.h
@@ -36,8 +36,14 @@ void visit_end_implicit_struct(Visitor *v, Error **errp);
void visit_start_list(Visitor *v, const char *name, Error **errp);
GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp);
void visit_end_list(Visitor *v, Error **errp);
-void visit_optional(Visitor *v, bool *present, const char *name,
- Error **errp);
+
+/**
+ * Check if an optional member @name of an object needs visiting.
+ * For input visitors, set *@present according to whether the
+ * corresponding visit_type_*() needs calling; for other visitors,
+ * leave *@present unchanged.
+ */
+void visit_optional(Visitor *v, bool *present, const char *name);
/**
* Determine the qtype of the item @name in the current object visit.
diff --git a/qapi/opts-visitor.c b/qapi/opts-visitor.c
index cd10392..ef5fb8b 100644
--- a/qapi/opts-visitor.c
+++ b/qapi/opts-visitor.c
@@ -488,7 +488,7 @@ opts_type_size(Visitor *v, uint64_t *obj, const char *name,
Error **errp)
static void
-opts_optional(Visitor *v, bool *present, const char *name, Error **errp)
+opts_optional(Visitor *v, bool *present, const char *name)
{
OptsVisitor *ov = DO_UPCAST(OptsVisitor, visitor, v);
diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
index cee76bc..e07d6f9 100644
--- a/qapi/qapi-visit-core.c
+++ b/qapi/qapi-visit-core.c
@@ -73,11 +73,10 @@ void visit_end_union(Visitor *v, bool data_present, Error
**errp)
}
}
-void visit_optional(Visitor *v, bool *present, const char *name,
- Error **errp)
+void visit_optional(Visitor *v, bool *present, const char *name)
{
if (v->optional) {
- v->optional(v, present, name, errp);
+ v->optional(v, present, name);
}
}
diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c
index 26b7414..932b5f3 100644
--- a/qapi/qmp-input-visitor.c
+++ b/qapi/qmp-input-visitor.c
@@ -303,8 +303,7 @@ static void qmp_input_type_any(Visitor *v, QObject **obj,
const char *name,
*obj = qobj;
}
-static void qmp_input_optional(Visitor *v, bool *present, const char *name,
- Error **errp)
+static void qmp_input_optional(Visitor *v, bool *present, const char *name)
{
QmpInputVisitor *qiv = to_qiv(v);
QObject *qobj = qmp_input_get_object(qiv, name, true);
diff --git a/qapi/string-input-visitor.c b/qapi/string-input-visitor.c
index bbd6a54..dee780a 100644
--- a/qapi/string-input-visitor.c
+++ b/qapi/string-input-visitor.c
@@ -299,8 +299,7 @@ static void parse_type_number(Visitor *v, double *obj,
const char *name,
*obj = val;
}
-static void parse_optional(Visitor *v, bool *present, const char *name,
- Error **errp)
+static void parse_optional(Visitor *v, bool *present, const char *name)
{
StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
diff --git a/scripts/qapi.py b/scripts/qapi.py
index 264de63..fe76a6e 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -1655,15 +1655,11 @@ def gen_visit_fields(members, prefix='',
need_cast=False, skiperr=False):
for memb in members:
if memb.optional:
ret += mcgen('''
- visit_optional(v, &%(prefix)shas_%(c_name)s, "%(name)s", %(errp)s);
+ visit_optional(v, &%(prefix)shas_%(c_name)s, "%(name)s");
+ if (%(prefix)shas_%(c_name)s) {
''',
prefix=prefix, c_name=c_name(memb.name),
name=memb.name, errp=errparg)
- ret += gen_err_check(skiperr=skiperr)
- ret += mcgen('''
- if (%(prefix)shas_%(c_name)s) {
-''',
- prefix=prefix, c_name=c_name(memb.name))
push_indent()
# Ugly: sometimes we need to cast away const
--
2.4.3
