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-rw-r--r--include/qapi/opts-visitor.h3
-rw-r--r--include/qapi/string-input-visitor.h2
-rw-r--r--include/qapi/string-output-visitor.h2
-rw-r--r--include/qapi/visitor-impl.h3
-rw-r--r--include/qapi/visitor.h12
5 files changed, 19 insertions, 3 deletions
diff --git a/include/qapi/opts-visitor.h b/include/qapi/opts-visitor.h
index 633aa71..fe37ed9 100644
--- a/include/qapi/opts-visitor.h
+++ b/include/qapi/opts-visitor.h
@@ -31,7 +31,8 @@ typedef struct OptsVisitor OptsVisitor;
* - values above INT64_MAX or LLONG_MAX are rejected.
*
* The Opts input visitor does not implement support for visiting QAPI
- * alternates, numbers (other than integers), or arbitrary QTypes.
+ * alternates, numbers (other than integers), null, or arbitrary
+ * QTypes.
*/
OptsVisitor *opts_visitor_new(const QemuOpts *opts);
void opts_visitor_cleanup(OptsVisitor *nv);
diff --git a/include/qapi/string-input-visitor.h b/include/qapi/string-input-visitor.h
index fdf33ae..a8d8f67 100644
--- a/include/qapi/string-input-visitor.h
+++ b/include/qapi/string-input-visitor.h
@@ -19,7 +19,7 @@ typedef struct StringInputVisitor StringInputVisitor;
/*
* The string input visitor does not implement support for visiting
- * QAPI structs, alternates, or arbitrary QTypes.
+ * QAPI structs, alternates, null, or arbitrary QTypes.
*/
StringInputVisitor *string_input_visitor_new(const char *str);
void string_input_visitor_cleanup(StringInputVisitor *v);
diff --git a/include/qapi/string-output-visitor.h b/include/qapi/string-output-visitor.h
index 3bb09af..89b7e4b 100644
--- a/include/qapi/string-output-visitor.h
+++ b/include/qapi/string-output-visitor.h
@@ -19,7 +19,7 @@ typedef struct StringOutputVisitor StringOutputVisitor;
/*
* The string output visitor does not implement support for visiting
- * QAPI structs, alternates, or arbitrary QTypes.
+ * QAPI structs, alternates, null, or arbitrary QTypes.
*/
StringOutputVisitor *string_output_visitor_new(bool human);
void string_output_visitor_cleanup(StringOutputVisitor *v);
diff --git a/include/qapi/visitor-impl.h b/include/qapi/visitor-impl.h
index 796d180..88d27d5 100644
--- a/include/qapi/visitor-impl.h
+++ b/include/qapi/visitor-impl.h
@@ -90,6 +90,9 @@ struct Visitor
void (*type_any)(Visitor *v, const char *name, QObject **obj,
Error **errp);
+ /* Must be set to visit explicit null values. */
+ void (*type_null)(Visitor *v, const char *name, Error **errp);
+
/* Must be set for input visitors, optional otherwise. The core
* takes care of the return type in the public interface. */
void (*optional)(Visitor *v, const char *name, bool *present);
diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h
index 2211637..709cca0 100644
--- a/include/qapi/visitor.h
+++ b/include/qapi/visitor.h
@@ -522,4 +522,16 @@ void visit_type_number(Visitor *v, const char *name, double *obj,
*/
void visit_type_any(Visitor *v, const char *name, QObject **obj, Error **errp);
+/*
+ * Visit a JSON null value.
+ *
+ * @name expresses the relationship of the null value to its parent
+ * container; see the general description of @name above.
+ *
+ * Unlike all other visit_type_* functions, no obj parameter is
+ * needed; rather, this is a witness that an explicit null value is
+ * expected rather than any other type.
+ */
+void visit_type_null(Visitor *v, const char *name, Error **errp);
+
#endif