# HG changeset patch
# User Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
# Date 1380986251 -32400
# Node ID 5abb684876c4fdaccda14eac7b1c06f3bad4b077
# Parent  5e1f5bc2763498b0b45c7386d85014467decfecd
report error when code segment's tail call flag was changed false

diff -r 5e1f5bc27634 -r 5abb684876c4 lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp	Sat Oct 05 22:04:18 2013 +0900
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp	Sun Oct 06 00:17:31 2013 +0900
@@ -5296,6 +5296,12 @@
          "Non-null chain expected with non-tail call!");
   assert((Result.second.getNode() || !Result.first.getNode()) &&
          "Null value expected with tail call!");
+#ifndef noCbC
+  // if code segment's tail call flag was changed false , we report it on error.
+  if (CLI.RetTy->is__CodeTy() && CS.getCaller()->getReturnType()->is__CodeTy() && !isTailCall)
+    DAG.getContext()->emitError(CS.getInstruction(),CS.getCalledFunction()->getName() + 
+			       " is code segment which called by code segment but its tail call flag was changed false!");
+#endif
   if (Result.first.getNode()) {
     setValue(CS.getInstruction(), Result.first);
   } else if (!CanLowerReturn && Result.second.getNode()) {