diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index 64a67c0ef2a..100cb2eb1e1 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -746,6 +746,7 @@ lltok::Kind LLLexer::LexIdentifier() {
   }
   DWKEYWORD(TAG, DwarfTag);
   DWKEYWORD(ATE, DwarfAttEncoding);
+  DWKEYWORD(LANG, DwarfLang);
 #undef DWKEYWORD
 
   // Check for [us]0x[0-9A-Fa-f]+ which are Hexadecimal constant generated by
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index 42ce206e3af..33f395a1f5a 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -2949,6 +2949,9 @@ struct DwarfTagField : public MDUnsignedField {
 struct DwarfAttEncodingField : public MDUnsignedField {
   DwarfAttEncodingField() : MDUnsignedField(0, dwarf::DW_ATE_hi_user) {}
 };
+struct DwarfLangField : public MDUnsignedField {
+  DwarfLangField() : MDUnsignedField(0, dwarf::DW_LANG_hi_user) {}
+};
 
 struct MDSignedField : public MDFieldImpl<int64_t> {
   int64_t Min;
@@ -2960,6 +2963,9 @@ struct MDSignedField : public MDFieldImpl<int64_t> {
       : ImplTy(Default), Min(Min), Max(Max) {}
 };
 
+struct MDBoolField : public MDFieldImpl<bool> {
+  MDBoolField(bool Default = false) : ImplTy(Default) {}
+};
 struct MDField : public MDFieldImpl<Metadata *> {
   MDField() : ImplTy(nullptr) {}
 };
@@ -3017,6 +3023,24 @@ bool LLParser::ParseMDField(LocTy Loc, StringRef Name, DwarfTagField &Result) {
   return false;
 }
 
+template <>
+bool LLParser::ParseMDField(LocTy Loc, StringRef Name, DwarfLangField &Result) {
+  if (Lex.getKind() == lltok::APSInt)
+    return ParseMDField(Loc, Name, static_cast<MDUnsignedField &>(Result));
+
+  if (Lex.getKind() != lltok::DwarfLang)
+    return TokError("expected DWARF language");
+
+  unsigned Lang = dwarf::getLanguage(Lex.getStrVal());
+  if (!Lang)
+    return TokError("invalid DWARF language" + Twine(" '") + Lex.getStrVal() +
+                    "'");
+  assert(Lang <= Result.Max && "Expected valid DWARF language");
+  Result.assign(Lang);
+  Lex.Lex();
+  return false;
+}
+
 template <>
 bool LLParser::ParseMDField(LocTy Loc, StringRef Name,
                             DwarfAttEncodingField &Result) {
@@ -3056,6 +3080,22 @@ bool LLParser::ParseMDField(LocTy Loc, StringRef Name,
   return false;
 }
 
+template <>
+bool LLParser::ParseMDField(LocTy Loc, StringRef Name, MDBoolField &Result) {
+  switch (Lex.getKind()) {
+  default:
+    return TokError("expected 'true' or 'false'");
+  case lltok::kw_true:
+    Result.assign(true);
+    break;
+  case lltok::kw_false:
+    Result.assign(false);
+    break;
+  }
+  Lex.Lex();
+  return false;
+}
+
 template <>
 bool LLParser::ParseMDField(LocTy Loc, StringRef Name, MDField &Result) {
   Metadata *MD;
@@ -3273,7 +3313,7 @@ bool LLParser::ParseMDCompositeType(MDNode *&Result, bool IsDistinct) {
   OPTIONAL(offset, MDUnsignedField, (0, UINT32_MAX));                          \
   OPTIONAL(flags, MDUnsignedField, (0, UINT32_MAX));                           \
   OPTIONAL(elements, MDField, );                                               \
-  OPTIONAL(runtimeLang, MDUnsignedField, (0, UINT32_MAX));                     \
+  OPTIONAL(runtimeLang, DwarfLangField, );                                     \
   OPTIONAL(vtableHolder, MDField, );                                           \
   OPTIONAL(templateParams, MDField, );                                         \
   OPTIONAL(identifier, MDStringField, );
diff --git a/lib/AsmParser/LLToken.h b/lib/AsmParser/LLToken.h
index 65c59b5654b..ae43a14201a 100644
--- a/lib/AsmParser/LLToken.h
+++ b/lib/AsmParser/LLToken.h
@@ -200,6 +200,7 @@ namespace lltok {
     StringConstant,    // "foo"
     DwarfTag,          // DW_TAG_foo (includes "DW_TAG_")
     DwarfAttEncoding,  // DW_ATE_foo (includes "DW_ATE_")
+    DwarfLang,         // DW_LANG_foo (includes "DW_LANG_")
 
     // Type valued tokens (TyVal).
     Type,
diff --git a/lib/IR/AsmWriter.cpp b/lib/IR/AsmWriter.cpp
index 77e2b2d64b9..0a585a097e2 100644
--- a/lib/IR/AsmWriter.cpp
+++ b/lib/IR/AsmWriter.cpp
@@ -1461,8 +1461,14 @@ static void writeMDCompositeType(raw_ostream &Out, const MDCompositeType *N,
     writeMetadataAsOperand(Out, N->getElements(), TypePrinter, Machine,
                            Context);
   }
-  if (N->getRuntimeLang())
-    Out << FS << "runtimeLang: " << N->getRuntimeLang();
+  if (unsigned Lang = N->getRuntimeLang()) {
+    Out << FS << "runtimeLang: ";
+    if (const char *S = dwarf::LanguageString(Lang))
+      Out << S;
+    else
+      Out << Lang;
+  }
+
   if (N->getVTableHolder()) {
     Out << FS << "vtableHolder: ";
     writeMetadataAsOperand(Out, N->getVTableHolder(), TypePrinter, Machine,
diff --git a/test/Assembler/debug-info.ll b/test/Assembler/debug-info.ll
index b4b29fe77a2..0b8ada7a231 100644
--- a/test/Assembler/debug-info.ll
+++ b/test/Assembler/debug-info.ll
@@ -1,8 +1,8 @@
 ; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
 ; RUN: verify-uselistorder %s
 
-; CHECK: !named = !{!0, !0, !1, !2, !3, !4, !5, !6, !7, !8, !8, !9, !10, !11, !12, !13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23}
-!named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10, !11, !12, !13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25}
+; CHECK: !named = !{!0, !0, !1, !2, !3, !4, !5, !6, !7, !8, !8, !9, !10, !11, !12, !13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24}
+!named = !{!0, !1, !2, !3, !4, !5, !6, !7, !8, !9, !10, !11, !12, !13, !14, !15, !16, !17, !18, !19, !20, !21, !22, !23, !24, !25, !26}
 
 ; CHECK:      !0 = !MDSubrange(count: 3)
 ; CHECK-NEXT: !1 = !MDSubrange(count: 3, lowerBound: 4)
@@ -41,22 +41,24 @@
 !15 = !MDDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 32, align: 32)
 
 ; CHECK-NEXT: !14 = !MDCompositeType(tag: DW_TAG_structure_type, name: "MyType", file: !9, line: 2, size: 32, align: 32, identifier: "MangledMyType")
-; CHECK-NEXT: !15 = distinct !MDCompositeType(tag: DW_TAG_structure_type, name: "Base", file: !9, line: 3, scope: !14, size: 128, align: 32, offset: 64, flags: 3, elements: !16, runtimeLang: 6, vtableHolder: !15, templateParams: !18, identifier: "MangledBase")
+; CHECK-NEXT: !15 = distinct !MDCompositeType(tag: DW_TAG_structure_type, name: "Base", file: !9, line: 3, scope: !14, size: 128, align: 32, offset: 64, flags: 3, elements: !16, runtimeLang: DW_LANG_C_plus_plus_11, vtableHolder: !15, templateParams: !18, identifier: "MangledBase")
 ; CHECK-NEXT: !16 = !{!17}
 ; CHECK-NEXT: !17 = !MDDerivedType(tag: DW_TAG_member, name: "field", file: !9, line: 4, scope: !15, baseType: !6, size: 32, align: 32, offset: 32, flags: 3)
 ; CHECK-NEXT: !18 = !{!6}
-; CHECK-NEXT: !19 = !MDCompositeType(tag: DW_TAG_structure_type, name: "Derived", file: !9, line: 3, scope: !14, baseType: !15, size: 128, align: 32, offset: 64, flags: 3, elements: !20, runtimeLang: 6, vtableHolder: !15, templateParams: !18, identifier: "MangledBase")
+; CHECK-NEXT: !19 = !MDCompositeType(tag: DW_TAG_structure_type, name: "Derived", file: !9, line: 3, scope: !14, baseType: !15, size: 128, align: 32, offset: 64, flags: 3, elements: !20, runtimeLang: DW_LANG_C_plus_plus_11, vtableHolder: !15, templateParams: !18, identifier: "MangledBase")
 ; CHECK-NEXT: !20 = !{!21}
 ; CHECK-NEXT: !21 = !MDDerivedType(tag: DW_TAG_inheritance, scope: !19, baseType: !15)
 ; CHECK-NEXT: !22 = !MDDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !6, size: 32, align: 32, extraData: !15)
 ; CHECK-NEXT: !23 = !MDCompositeType(tag: DW_TAG_structure_type)
+; CHECK-NEXT: !24 = !MDCompositeType(tag: DW_TAG_structure_type, runtimeLang: DW_LANG_Cobol85)
 !16 = !MDCompositeType(tag: DW_TAG_structure_type, name: "MyType", file: !11, line: 2, size: 32, align: 32, identifier: "MangledMyType")
-!17 = !MDCompositeType(tag: DW_TAG_structure_type, name: "Base", file: !11, line: 3, scope: !16, size: 128, align: 32, offset: 64, flags: 3, elements: !18, runtimeLang: 6, vtableHolder: !17, templateParams: !20, identifier: "MangledBase")
+!17 = !MDCompositeType(tag: DW_TAG_structure_type, name: "Base", file: !11, line: 3, scope: !16, size: 128, align: 32, offset: 64, flags: 3, elements: !18, runtimeLang: DW_LANG_C_plus_plus_11, vtableHolder: !17, templateParams: !20, identifier: "MangledBase")
 !18 = !{!19}
 !19 = !MDDerivedType(tag: DW_TAG_member, name: "field", file: !11, line: 4, scope: !17, baseType: !7, size: 32, align: 32, offset: 32, flags: 3)
 !20 = !{!7}
-!21 = !MDCompositeType(tag: DW_TAG_structure_type, name: "Derived", file: !11, line: 3, scope: !16, baseType: !17, size: 128, align: 32, offset: 64, flags: 3, elements: !22, runtimeLang: 6, vtableHolder: !17, templateParams: !20, identifier: "MangledBase")
+!21 = !MDCompositeType(tag: DW_TAG_structure_type, name: "Derived", file: !11, line: 3, scope: !16, baseType: !17, size: 128, align: 32, offset: 64, flags: 3, elements: !22, runtimeLang: DW_LANG_C_plus_plus_11, vtableHolder: !17, templateParams: !20, identifier: "MangledBase")
 !22 = !{!23}
 !23 = !MDDerivedType(tag: DW_TAG_inheritance, scope: !21, baseType: !17)
 !24 = !MDDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !7, size: 32, align: 32, extraData: !17)
 !25 = !MDCompositeType(tag: DW_TAG_structure_type)
+!26 = !MDCompositeType(tag: DW_TAG_structure_type, runtimeLang: 6)
diff --git a/utils/vim/llvm.vim b/utils/vim/llvm.vim
index 6f32864ed3d..df564113185 100644
--- a/utils/vim/llvm.vim
+++ b/utils/vim/llvm.vim
@@ -79,6 +79,7 @@ syn match   llvmIdentifier /![-a-zA-Z$._][-a-zA-Z$._0-9]*\ze\s*[=!]/
 syn match   llvmType /!\zs\a\+\ze\s*(/
 syn match   llvmConstant /\<DW_TAG_[a-z_]\+\>/
 syn match   llvmConstant /\<DW_ATE_[a-zA-Z_]\+\>/
+syn match   llvmConstant /\<DW_LANG_[a-zA-Z0-9_]\+\>/
 
 " Syntax-highlight dejagnu test commands.
 syn match  llvmSpecialComment /;\s*RUN:.*$/