1 files changed, 12 insertions, 4 deletions
diff --git a/llvm/lib/IR/Attributes.cpp b/llvm/lib/IR/Attributes.cpp
index 95ddc3628a0..2b76de77dca 100644
--- a/llvm/lib/IR/Attributes.cpp
+++ b/llvm/lib/IR/Attributes.cpp
@@ -381,10 +381,18 @@ std::string Attribute::getAsString(bool InAttrGrp) const {
     std::string Result;
     Result += (Twine('"') + getKindAsString() + Twine('"')).str();
 
-    StringRef Val = pImpl->getValueAsString();
-    if (Val.empty()) return Result;
-
-    Result += ("=\"" + Val + Twine('"')).str();
+    std::string AttrVal = pImpl->getValueAsString();
+    if (AttrVal.empty()) return Result;
+
+    // Since some attribute strings contain special characters that cannot be
+    // printable, those have to be escaped to make the attribute value printable
+    // as is.  e.g. "\01__gnu_mcount_nc"
+    {
+      raw_string_ostream OS(Result);
+      OS << "=\"";
+      PrintEscapedString(AttrVal, OS);
+      OS << "\"";
+    }
     return Result;
   }