TableGen add warning diagnostic helper functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155012 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/TableGen/Error.h b/include/llvm/TableGen/Error.h
index c01b32b..fd5f805 100644
--- a/include/llvm/TableGen/Error.h
+++ b/include/llvm/TableGen/Error.h
@@ -29,6 +29,11 @@
   const std::string &getMessage() const { return Message; }
 };
 
+void PrintWarning(SMLoc WarningLoc, const Twine &Msg);
+void PrintWarning(const char *Loc, const Twine &Msg);
+void PrintWarning(const Twine &Msg);
+void PrintWarning(const TGError &Warning);
+
 void PrintError(SMLoc ErrorLoc, const Twine &Msg);
 void PrintError(const char *Loc, const Twine &Msg);
 void PrintError(const Twine &Msg);
diff --git a/lib/TableGen/Error.cpp b/lib/TableGen/Error.cpp
index 5071ee7..369e3c1 100644
--- a/lib/TableGen/Error.cpp
+++ b/lib/TableGen/Error.cpp
@@ -20,6 +20,22 @@
 
 SourceMgr SrcMgr;
 
+void PrintWarning(SMLoc WarningLoc, const Twine &Msg) {
+  SrcMgr.PrintMessage(WarningLoc, SourceMgr::DK_Warning, Msg);
+}
+
+void PrintWarning(const char *Loc, const Twine &Msg) {
+  SrcMgr.PrintMessage(SMLoc::getFromPointer(Loc), SourceMgr::DK_Warning, Msg);
+}
+
+void PrintWarning(const Twine &Msg) {
+  errs() << "error:" << Msg << "\n";
+}
+
+void PrintWarning(const TGError &Warning) {
+  PrintWarning(Warning.getLoc(), Warning.getMessage());
+}
+
 void PrintError(SMLoc ErrorLoc, const Twine &Msg) {
   SrcMgr.PrintMessage(ErrorLoc, SourceMgr::DK_Error, Msg);
 }