1 files changed, 38 insertions, 0 deletions
diff --git a/libgo/runtime/go-typedesc-equal.c b/libgo/runtime/go-typedesc-equal.c
new file mode 100644
index 000000000..932519aab
--- /dev/null
+++ b/libgo/runtime/go-typedesc-equal.c
@@ -0,0 +1,38 @@
+/* go-typedesc-equal.c -- return whether two type descriptors are equal.
+
+   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 "go-string.h"
+#include "go-type.h"
+
+/* Compare type descriptors for equality.  This is necessary because
+   types may have different descriptors in different shared libraries.
+   Also, unnamed types may have multiple type descriptors even in a
+   single shared library.  */
+
+_Bool
+__go_type_descriptors_equal (const struct __go_type_descriptor *td1,
+			     const struct __go_type_descriptor *td2)
+{
+  if (td1 == td2)
+    return 1;
+  /* In a type switch we can get a NULL descriptor.  */
+  if (td1 == NULL || td2 == NULL)
+    return 0;
+  if (td1->__code != td2->__code || td1->__hash != td2->__hash)
+    return 0;
+  if (td1->__uncommon != NULL && td1->__uncommon->__name != NULL)
+    {
+      if (td2->__uncommon == NULL || td2->__uncommon->__name == NULL)
+	return 0;
+      return (__go_ptr_strings_equal (td1->__uncommon->__name,
+				      td2->__uncommon->__name)
+	      && __go_ptr_strings_equal (td1->__uncommon->__pkg_path,
+					 td2->__uncommon->__pkg_path));
+    }
+  if (td2->__uncommon != NULL && td2->__uncommon->__name != NULL)
+    return 0;
+  return __go_ptr_strings_equal (td1->__reflection, td2->__reflection);
+}