1 files changed, 57 insertions, 0 deletions
diff --git a/libgo/runtime/interface.h b/libgo/runtime/interface.h
new file mode 100644
index 000000000..610f20890
--- /dev/null
+++ b/libgo/runtime/interface.h
@@ -0,0 +1,57 @@
+/* interface.h -- the interface type for Go.
+
+   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.  */
+
+#ifndef LIBGO_INTERFACE_H
+#define LIBGO_INTERFACE_H
+
+#include "go-type.h"
+
+/* A variable of interface type is an instance of this struct, if the
+   interface has any methods.  */
+
+struct __go_interface
+{
+  /* A pointer to the interface method table.  The first pointer is
+     the type descriptor of the object.  Subsequent pointers are
+     pointers to functions.  This is effectively the vtable for this
+     interface.  The function pointers are in the same order as the
+     list in the internal representation of the interface, which sorts
+     them by name.  */
+  const void **__methods;
+
+  /* The object.  If the object is a pointer--if the type descriptor
+     code is GO_PTR or GO_UNSAFE_POINTER--then this field is the value
+     of the object itself.  Otherwise this is a pointer to memory
+     which holds the value.  */
+  void *__object;
+};
+
+/* A variable of an empty interface type is an instance of this
+   struct.  */
+
+struct __go_empty_interface
+{
+  /* The type descriptor of the object.  */
+  const struct __go_type_descriptor *__type_descriptor;
+
+  /* The object.  This is the same as __go_interface above.  */
+  void *__object;
+};
+
+extern void *
+__go_convert_interface (const struct __go_type_descriptor *,
+			const struct __go_type_descriptor *);
+
+extern void *
+__go_convert_interface_2 (const struct __go_type_descriptor *,
+			  const struct __go_type_descriptor *,
+			  _Bool may_fail);
+
+extern _Bool
+__go_can_convert_to_interface(const struct __go_type_descriptor *,
+			      const struct __go_type_descriptor *);
+
+#endif /* !defined(LIBGO_INTERFACE_H) */