1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/df.h b/gcc/df.h
index 720bbfadece..3a735aedd05 100644
--- a/gcc/df.h
+++ b/gcc/df.h
@@ -593,4 +593,23 @@ extern void df_hard_reg_init (void);
 extern bool df_read_modify_subreg_p (rtx);
 
 
+/* web */
+
+/* This entry is allocated for each reference in the insn stream.  */
+struct web_entry
+{
+  /* Pointer to the parent in the union/find tree.  */
+  struct web_entry *pred;
+  /* Newly assigned register to the entry.  Set only for roots.  */
+  rtx reg;
+  void* extra_info;
+};
+
+extern struct web_entry *unionfind_root (struct web_entry *);
+extern bool unionfind_union (struct web_entry *, struct web_entry *);
+extern void union_defs (struct df *, struct df_ref *,
+                        struct web_entry *, struct web_entry *,
+			bool (*fun) (struct web_entry *, struct web_entry *));
+
+
 #endif /* GCC_DF_H */