object: prevent registering the same ressource type multiple times

When a module registering custom ressource types, such as "fs.so", is
required multiple times we need to ensure that only one instance of a
given ressource type is registered, otherwise objects created after
subsequent requires will cease to function since the internal type
prototype mismatches.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 7 insertions, 0 deletions

diff --git a/object.c b/object.c
index c0a5227..df81fda 100644
--- a/object.c
+++ b/object.c
@@ -357,6 +357,13 @@ static uc_ressource_types res_types;
 uc_ressource_type *
 uc_ressource_type_add(const char *name, uc_prototype *proto, void (*freefn)(void *))
 {
+	uc_ressource_type *existing;
+
+	existing = uc_ressource_type_lookup(name);
+
+	if (existing)
+		return existing;
+
 	uc_vector_grow(&res_types);
 
 	res_types.entries[res_types.count].name = name;