1 files changed, 55 insertions, 0 deletions
diff --git a/libgo/runtime/go-type-interface.c b/libgo/runtime/go-type-interface.c
new file mode 100644
index 000000000..9750b843c
--- /dev/null
+++ b/libgo/runtime/go-type-interface.c
@@ -0,0 +1,55 @@
+/* go-type-interface.c -- hash and equality interface functions.
+
+   Copyright 2009 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+#include "interface.h"
+#include "go-type.h"
+
+/* A hash function for an interface.  */
+
+size_t
+__go_type_hash_interface (const void *vval,
+			  size_t key_size __attribute__ ((unused)))
+{
+  const struct __go_interface *val;
+  const struct __go_type_descriptor *descriptor;
+  size_t size;
+
+  val = (const struct __go_interface *) vval;
+  if (val->__methods == NULL)
+    return 0;
+  descriptor = (const struct __go_type_descriptor *) val->__methods[0];
+  size = descriptor->__size;
+  if (__go_is_pointer_type (descriptor))
+    return descriptor->__hashfn (&val->__object, size);
+  else
+    return descriptor->__hashfn (val->__object, size);
+}
+
+/* An equality function for an interface.  */
+
+_Bool
+__go_type_equal_interface (const void *vv1, const void *vv2,
+			   size_t key_size __attribute__ ((unused)))
+{
+  const struct __go_interface *v1;
+  const struct __go_interface *v2;
+  const struct __go_type_descriptor* v1_descriptor;
+  const struct __go_type_descriptor* v2_descriptor;
+
+  v1 = (const struct __go_interface *) vv1;
+  v2 = (const struct __go_interface *) vv2;
+  if (v1->__methods == NULL || v2->__methods == NULL)
+    return v1->__methods == v2->__methods;
+  v1_descriptor = (const struct __go_type_descriptor *) v1->__methods[0];
+  v2_descriptor = (const struct __go_type_descriptor *) v2->__methods[0];
+  if (!__go_type_descriptors_equal (v1_descriptor, v2_descriptor))
+    return 0;
+  if (__go_is_pointer_type (v1_descriptor))
+    return v1->__object == v2->__object;
+  else
+    return v1_descriptor->__equalfn (v1->__object, v2->__object,
+				     v1_descriptor->__size);
+}