Clean up turn_back_am(), panic on unknown arity.

[libfirm] / include / libfirm / typerep.h

diff --git a/include/libfirm/typerep.h b/include/libfirm/typerep.h
index 2dc4fa5..fdc8880 100644 (file)
--- a/include/libfirm/typerep.h
+++ b/include/libfirm/typerep.h
@@ -403,10 +403,13 @@ void set_entity_backend_marked(ir_entity *ent, int flag);
  * Bitfield type indicating the way an entity is used.
  */
 typedef enum {
-       ir_usage_address_taken    = 1 << 0,
-       ir_usage_write            = 1 << 1,
-       ir_usage_read             = 1 << 2,
-       ir_usage_reinterpret_cast = 1 << 3,
+       ir_usage_none             = 0,      /**< This entity is unused. */
+       ir_usage_address_taken    = 1 << 0, /**< The address of this entity was taken. */
+       ir_usage_write            = 1 << 1, /**< The entity was written to. */
+       ir_usage_read             = 1 << 2, /**< The entity was read. */
+       ir_usage_reinterpret_cast = 1 << 3, /**< The entity was read but with a wrong mode
+                                                (an implicit reinterpret cast) */
+       /** Unknown access */
        ir_usage_unknown
                = ir_usage_address_taken | ir_usage_write | ir_usage_read
                | ir_usage_reinterpret_cast