If RTL checking is enabled, make sure that emit_insn is not used to emit a

jump insn.

From-SVN: r31420

gcc/ChangeLog

+2000-01-14  Nick Clifton  <nickc@cygnus.com>
+
+	* emit-rtl.c (emit_insn): If checking is enabled, make sure
+	that this function has not been used to emit a jump
+	instruction.
+
+	* jump.c (return_jump_1): Cope with being passed a null rtx.
+
 2000-01-14  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* eh-common.h: PROTO -> PARAMS.

gcc/emit-rtl.c

@@ -2948,6 +2948,17 @@ emit_insn (pattern)
       add_insn (insn);
     }
 
+#ifdef ENABLE_RTL_CHECKING
+  if (insn
+      && (returnjump_p (insn)
+	  || (GET_CODE (insn) == SET
+	      && SET_DEST (insn) == pc_rtx)))
+    {
+      warning ("ICE: emit_insn used where emit_jump_insn needed:\n");
+      debug_rtx (insn);
+    }
+#endif
+      
   return insn;
 }
 

gcc/jump.c

@@ -3757,7 +3757,7 @@ returnjump_p_1 (loc, data)
      void *data ATTRIBUTE_UNUSED;
 {
   rtx x = *loc;
-  return GET_CODE (x) == RETURN;
+  return x && GET_CODE (x) == RETURN;
 }
 
 int