IR: Give 'DI' prefix to debug info metadata

Finish off PR23080 by renaming the debug info IR constructs from `MD*`
to `DI*`.  The last of the `DIDescriptor` classes were deleted in
r235356, and the last of the related typedefs removed in r235413, so
this has all baked for about a week.

Note: If you have out-of-tree code (like a frontend), I recommend that
you get everything compiling and tests passing with the *previous*
commit before updating to this one.  It'll be easier to keep track of
what code is using the `DIDescriptor` hierarchy and what you've already
updated, and I think you're extremely unlikely to insert bugs.  YMMV of
course.

Back to *this* commit: I did this using the rename-md-di-nodes.sh
upgrade script I've attached to PR23080 (both code and testcases) and
filtered through clang-format-diff.py.  I edited the tests for
test/Assembler/invalid-generic-debug-node-*.ll by hand since the columns
were off-by-three.  It should work on your out-of-tree testcases (and
code, if you've followed the advice in the previous paragraph).

Some of the tests are in badly named files now (e.g.,
test/Assembler/invalid-mdcompositetype-missing-tag.ll should be
'dicompositetype'); I'll come back and move the files in a follow-up
commit.

llvm-svn: 236120
diff --git a/llvm/lib/Analysis/ModuleDebugInfoPrinter.cpp b/llvm/lib/Analysis/ModuleDebugInfoPrinter.cpp
index 7ee2f9d..36c4714 100644
--- a/llvm/lib/Analysis/ModuleDebugInfoPrinter.cpp
+++ b/llvm/lib/Analysis/ModuleDebugInfoPrinter.cpp
@@ -72,7 +72,7 @@
   // Printing the nodes directly isn't particularly helpful (since they
   // reference other nodes that won't be printed, particularly for the
   // filenames), so just print a few useful things.
-  for (MDCompileUnit *CU : Finder.compile_units()) {
+  for (DICompileUnit *CU : Finder.compile_units()) {
     O << "Compile unit: ";
     if (const char *Lang = dwarf::LanguageString(CU->getSourceLanguage()))
       O << Lang;
@@ -82,7 +82,7 @@
     O << '\n';
   }
 
-  for (MDSubprogram *S : Finder.subprograms()) {
+  for (DISubprogram *S : Finder.subprograms()) {
     O << "Subprogram: " << S->getName();
     printFile(O, S->getFilename(), S->getDirectory(), S->getLine());
     if (!S->getLinkageName().empty())
@@ -90,7 +90,7 @@
     O << '\n';
   }
 
-  for (const MDGlobalVariable *GV : Finder.global_variables()) {
+  for (const DIGlobalVariable *GV : Finder.global_variables()) {
     O << "Global variable: " << GV->getName();
     printFile(O, GV->getFilename(), GV->getDirectory(), GV->getLine());
     if (!GV->getLinkageName().empty())
@@ -98,12 +98,12 @@
     O << '\n';
   }
 
-  for (const MDType *T : Finder.types()) {
+  for (const DIType *T : Finder.types()) {
     O << "Type:";
     if (!T->getName().empty())
       O << ' ' << T->getName();
     printFile(O, T->getFilename(), T->getDirectory(), T->getLine());
-    if (auto *BT = dyn_cast<MDBasicType>(T)) {
+    if (auto *BT = dyn_cast<DIBasicType>(T)) {
       O << " ";
       if (const char *Encoding =
               dwarf::AttributeEncodingString(BT->getEncoding()))
@@ -117,7 +117,7 @@
       else
         O << "unknown-tag(" << T->getTag() << ")";
     }
-    if (auto *CT = dyn_cast<MDCompositeType>(T)) {
+    if (auto *CT = dyn_cast<DICompositeType>(T)) {
       if (auto *S = CT->getRawIdentifier())
         O << " (identifier: '" << S->getString() << "')";
     }
diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index 172f309..1a2e1f8 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -2994,7 +2994,7 @@
 /// MDNode:
 ///  ::= !{ ... }
 ///  ::= !7
-///  ::= !MDLocation(...)
+///  ::= !DILocation(...)
 bool LLParser::ParseMDNode(MDNode *&N) {
   if (Lex.getKind() == lltok::MetadataVar)
     return ParseSpecializedMDNode(N);
@@ -3209,7 +3209,7 @@
     if (Lex.getKind() != lltok::DIFlag)
       return TokError("expected debug info flag");
 
-    Val = DebugNode::getFlag(Lex.getStrVal());
+    Val = DINode::getFlag(Lex.getStrVal());
     if (!Val)
       return TokError(Twine("invalid debug info flag flag '") +
                       Lex.getStrVal() + "'");
@@ -3391,9 +3391,9 @@
 #define GET_OR_DISTINCT(CLASS, ARGS)                                           \
   (IsDistinct ? CLASS::getDistinct ARGS : CLASS::get ARGS)
 
-/// ParseMDLocationFields:
-///   ::= !MDLocation(line: 43, column: 8, scope: !5, inlinedAt: !6)
-bool LLParser::ParseMDLocation(MDNode *&Result, bool IsDistinct) {
+/// ParseDILocationFields:
+///   ::= !DILocation(line: 43, column: 8, scope: !5, inlinedAt: !6)
+bool LLParser::ParseDILocation(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   OPTIONAL(line, LineField, );                                                 \
   OPTIONAL(column, ColumnField, );                                             \
@@ -3403,13 +3403,13 @@
 #undef VISIT_MD_FIELDS
 
   Result = GET_OR_DISTINCT(
-      MDLocation, (Context, line.Val, column.Val, scope.Val, inlinedAt.Val));
+      DILocation, (Context, line.Val, column.Val, scope.Val, inlinedAt.Val));
   return false;
 }
 
-/// ParseGenericDebugNode:
-///   ::= !GenericDebugNode(tag: 15, header: "...", operands: {...})
-bool LLParser::ParseGenericDebugNode(MDNode *&Result, bool IsDistinct) {
+/// ParseGenericDINode:
+///   ::= !GenericDINode(tag: 15, header: "...", operands: {...})
+bool LLParser::ParseGenericDINode(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(tag, DwarfTagField, );                                              \
   OPTIONAL(header, MDStringField, );                                           \
@@ -3417,40 +3417,40 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(GenericDebugNode,
+  Result = GET_OR_DISTINCT(GenericDINode,
                            (Context, tag.Val, header.Val, operands.Val));
   return false;
 }
 
-/// ParseMDSubrange:
-///   ::= !MDSubrange(count: 30, lowerBound: 2)
-bool LLParser::ParseMDSubrange(MDNode *&Result, bool IsDistinct) {
+/// ParseDISubrange:
+///   ::= !DISubrange(count: 30, lowerBound: 2)
+bool LLParser::ParseDISubrange(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(count, MDSignedField, (-1, -1, INT64_MAX));                         \
   OPTIONAL(lowerBound, MDSignedField, );
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDSubrange, (Context, count.Val, lowerBound.Val));
+  Result = GET_OR_DISTINCT(DISubrange, (Context, count.Val, lowerBound.Val));
   return false;
 }
 
-/// ParseMDEnumerator:
-///   ::= !MDEnumerator(value: 30, name: "SomeKind")
-bool LLParser::ParseMDEnumerator(MDNode *&Result, bool IsDistinct) {
+/// ParseDIEnumerator:
+///   ::= !DIEnumerator(value: 30, name: "SomeKind")
+bool LLParser::ParseDIEnumerator(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(name, MDStringField, );                                             \
   REQUIRED(value, MDSignedField, );
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDEnumerator, (Context, value.Val, name.Val));
+  Result = GET_OR_DISTINCT(DIEnumerator, (Context, value.Val, name.Val));
   return false;
 }
 
-/// ParseMDBasicType:
-///   ::= !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32)
-bool LLParser::ParseMDBasicType(MDNode *&Result, bool IsDistinct) {
+/// ParseDIBasicType:
+///   ::= !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32)
+bool LLParser::ParseDIBasicType(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   OPTIONAL(tag, DwarfTagField, (dwarf::DW_TAG_base_type));                     \
   OPTIONAL(name, MDStringField, );                                             \
@@ -3460,16 +3460,16 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDBasicType, (Context, tag.Val, name.Val, size.Val,
+  Result = GET_OR_DISTINCT(DIBasicType, (Context, tag.Val, name.Val, size.Val,
                                          align.Val, encoding.Val));
   return false;
 }
 
-/// ParseMDDerivedType:
-///   ::= !MDDerivedType(tag: DW_TAG_pointer_type, name: "int", file: !0,
+/// ParseDIDerivedType:
+///   ::= !DIDerivedType(tag: DW_TAG_pointer_type, name: "int", file: !0,
 ///                      line: 7, scope: !1, baseType: !2, size: 32,
 ///                      align: 32, offset: 0, flags: 0, extraData: !3)
-bool LLParser::ParseMDDerivedType(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDIDerivedType(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(tag, DwarfTagField, );                                              \
   OPTIONAL(name, MDStringField, );                                             \
@@ -3485,14 +3485,14 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDDerivedType,
+  Result = GET_OR_DISTINCT(DIDerivedType,
                            (Context, tag.Val, name.Val, file.Val, line.Val,
                             scope.Val, baseType.Val, size.Val, align.Val,
                             offset.Val, flags.Val, extraData.Val));
   return false;
 }
 
-bool LLParser::ParseMDCompositeType(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDICompositeType(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(tag, DwarfTagField, );                                              \
   OPTIONAL(name, MDStringField, );                                             \
@@ -3513,44 +3513,44 @@
 #undef VISIT_MD_FIELDS
 
   Result = GET_OR_DISTINCT(
-      MDCompositeType,
+      DICompositeType,
       (Context, tag.Val, name.Val, file.Val, line.Val, scope.Val, baseType.Val,
        size.Val, align.Val, offset.Val, flags.Val, elements.Val,
        runtimeLang.Val, vtableHolder.Val, templateParams.Val, identifier.Val));
   return false;
 }
 
-bool LLParser::ParseMDSubroutineType(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDISubroutineType(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   OPTIONAL(flags, DIFlagField, );                                              \
   REQUIRED(types, MDField, );
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDSubroutineType, (Context, flags.Val, types.Val));
+  Result = GET_OR_DISTINCT(DISubroutineType, (Context, flags.Val, types.Val));
   return false;
 }
 
-/// ParseMDFileType:
-///   ::= !MDFileType(filename: "path/to/file", directory: "/path/to/dir")
-bool LLParser::ParseMDFile(MDNode *&Result, bool IsDistinct) {
+/// ParseDIFileType:
+///   ::= !DIFileType(filename: "path/to/file", directory: "/path/to/dir")
+bool LLParser::ParseDIFile(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(filename, MDStringField, );                                         \
   REQUIRED(directory, MDStringField, );
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDFile, (Context, filename.Val, directory.Val));
+  Result = GET_OR_DISTINCT(DIFile, (Context, filename.Val, directory.Val));
   return false;
 }
 
-/// ParseMDCompileUnit:
-///   ::= !MDCompileUnit(language: DW_LANG_C99, file: !0, producer: "clang",
+/// ParseDICompileUnit:
+///   ::= !DICompileUnit(language: DW_LANG_C99, file: !0, producer: "clang",
 ///                      isOptimized: true, flags: "-O2", runtimeVersion: 1,
 ///                      splitDebugFilename: "abc.debug", emissionKind: 1,
 ///                      enums: !1, retainedTypes: !2, subprograms: !3,
 ///                      globals: !4, imports: !5)
-bool LLParser::ParseMDCompileUnit(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDICompileUnit(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(language, DwarfLangField, );                                        \
   REQUIRED(file, MDField, (/* AllowNull */ false));                            \
@@ -3568,7 +3568,7 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDCompileUnit,
+  Result = GET_OR_DISTINCT(DICompileUnit,
                            (Context, language.Val, file.Val, producer.Val,
                             isOptimized.Val, flags.Val, runtimeVersion.Val,
                             splitDebugFilename.Val, emissionKind.Val, enums.Val,
@@ -3577,15 +3577,15 @@
   return false;
 }
 
-/// ParseMDSubprogram:
-///   ::= !MDSubprogram(scope: !0, name: "foo", linkageName: "_Zfoo",
+/// ParseDISubprogram:
+///   ::= !DISubprogram(scope: !0, name: "foo", linkageName: "_Zfoo",
 ///                     file: !1, line: 7, type: !2, isLocal: false,
 ///                     isDefinition: true, scopeLine: 8, containingType: !3,
 ///                     virtuality: DW_VIRTUALTIY_pure_virtual,
 ///                     virtualIndex: 10, flags: 11,
 ///                     isOptimized: false, function: void ()* @_Z3foov,
 ///                     templateParams: !4, declaration: !5, variables: !6)
-bool LLParser::ParseMDSubprogram(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDISubprogram(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   OPTIONAL(scope, MDField, );                                                  \
   OPTIONAL(name, MDStringField, );                                             \
@@ -3609,7 +3609,7 @@
 #undef VISIT_MD_FIELDS
 
   Result = GET_OR_DISTINCT(
-      MDSubprogram, (Context, scope.Val, name.Val, linkageName.Val, file.Val,
+      DISubprogram, (Context, scope.Val, name.Val, linkageName.Val, file.Val,
                      line.Val, type.Val, isLocal.Val, isDefinition.Val,
                      scopeLine.Val, containingType.Val, virtuality.Val,
                      virtualIndex.Val, flags.Val, isOptimized.Val, function.Val,
@@ -3617,9 +3617,9 @@
   return false;
 }
 
-/// ParseMDLexicalBlock:
-///   ::= !MDLexicalBlock(scope: !0, file: !2, line: 7, column: 9)
-bool LLParser::ParseMDLexicalBlock(MDNode *&Result, bool IsDistinct) {
+/// ParseDILexicalBlock:
+///   ::= !DILexicalBlock(scope: !0, file: !2, line: 7, column: 9)
+bool LLParser::ParseDILexicalBlock(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(scope, MDField, (/* AllowNull */ false));                           \
   OPTIONAL(file, MDField, );                                                   \
@@ -3629,13 +3629,13 @@
 #undef VISIT_MD_FIELDS
 
   Result = GET_OR_DISTINCT(
-      MDLexicalBlock, (Context, scope.Val, file.Val, line.Val, column.Val));
+      DILexicalBlock, (Context, scope.Val, file.Val, line.Val, column.Val));
   return false;
 }
 
-/// ParseMDLexicalBlockFile:
-///   ::= !MDLexicalBlockFile(scope: !0, file: !2, discriminator: 9)
-bool LLParser::ParseMDLexicalBlockFile(MDNode *&Result, bool IsDistinct) {
+/// ParseDILexicalBlockFile:
+///   ::= !DILexicalBlockFile(scope: !0, file: !2, discriminator: 9)
+bool LLParser::ParseDILexicalBlockFile(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(scope, MDField, (/* AllowNull */ false));                           \
   OPTIONAL(file, MDField, );                                                   \
@@ -3643,14 +3643,14 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDLexicalBlockFile,
+  Result = GET_OR_DISTINCT(DILexicalBlockFile,
                            (Context, scope.Val, file.Val, discriminator.Val));
   return false;
 }
 
-/// ParseMDNamespace:
-///   ::= !MDNamespace(scope: !0, file: !2, name: "SomeNamespace", line: 9)
-bool LLParser::ParseMDNamespace(MDNode *&Result, bool IsDistinct) {
+/// ParseDINamespace:
+///   ::= !DINamespace(scope: !0, file: !2, name: "SomeNamespace", line: 9)
+bool LLParser::ParseDINamespace(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(scope, MDField, );                                                  \
   OPTIONAL(file, MDField, );                                                   \
@@ -3659,14 +3659,14 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDNamespace,
+  Result = GET_OR_DISTINCT(DINamespace,
                            (Context, scope.Val, file.Val, name.Val, line.Val));
   return false;
 }
 
-/// ParseMDTemplateTypeParameter:
-///   ::= !MDTemplateTypeParameter(name: "Ty", type: !1)
-bool LLParser::ParseMDTemplateTypeParameter(MDNode *&Result, bool IsDistinct) {
+/// ParseDITemplateTypeParameter:
+///   ::= !DITemplateTypeParameter(name: "Ty", type: !1)
+bool LLParser::ParseDITemplateTypeParameter(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   OPTIONAL(name, MDStringField, );                                             \
   REQUIRED(type, MDField, );
@@ -3674,14 +3674,14 @@
 #undef VISIT_MD_FIELDS
 
   Result =
-      GET_OR_DISTINCT(MDTemplateTypeParameter, (Context, name.Val, type.Val));
+      GET_OR_DISTINCT(DITemplateTypeParameter, (Context, name.Val, type.Val));
   return false;
 }
 
-/// ParseMDTemplateValueParameter:
-///   ::= !MDTemplateValueParameter(tag: DW_TAG_template_value_parameter,
+/// ParseDITemplateValueParameter:
+///   ::= !DITemplateValueParameter(tag: DW_TAG_template_value_parameter,
 ///                                 name: "V", type: !1, value: i32 7)
-bool LLParser::ParseMDTemplateValueParameter(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDITemplateValueParameter(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   OPTIONAL(tag, DwarfTagField, (dwarf::DW_TAG_template_value_parameter));      \
   OPTIONAL(name, MDStringField, );                                             \
@@ -3690,17 +3690,17 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDTemplateValueParameter,
+  Result = GET_OR_DISTINCT(DITemplateValueParameter,
                            (Context, tag.Val, name.Val, type.Val, value.Val));
   return false;
 }
 
-/// ParseMDGlobalVariable:
-///   ::= !MDGlobalVariable(scope: !0, name: "foo", linkageName: "foo",
+/// ParseDIGlobalVariable:
+///   ::= !DIGlobalVariable(scope: !0, name: "foo", linkageName: "foo",
 ///                         file: !1, line: 7, type: !2, isLocal: false,
 ///                         isDefinition: true, variable: i32* @foo,
 ///                         declaration: !3)
-bool LLParser::ParseMDGlobalVariable(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDIGlobalVariable(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(name, MDStringField, (/* AllowEmpty */ false));                     \
   OPTIONAL(scope, MDField, );                                                  \
@@ -3715,17 +3715,17 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDGlobalVariable,
+  Result = GET_OR_DISTINCT(DIGlobalVariable,
                            (Context, scope.Val, name.Val, linkageName.Val,
                             file.Val, line.Val, type.Val, isLocal.Val,
                             isDefinition.Val, variable.Val, declaration.Val));
   return false;
 }
 
-/// ParseMDLocalVariable:
-///   ::= !MDLocalVariable(tag: DW_TAG_arg_variable, scope: !0, name: "foo",
+/// ParseDILocalVariable:
+///   ::= !DILocalVariable(tag: DW_TAG_arg_variable, scope: !0, name: "foo",
 ///                        file: !1, line: 7, type: !2, arg: 2, flags: 7)
-bool LLParser::ParseMDLocalVariable(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDILocalVariable(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(tag, DwarfTagField, );                                              \
   REQUIRED(scope, MDField, (/* AllowNull */ false));                           \
@@ -3738,15 +3738,15 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDLocalVariable,
+  Result = GET_OR_DISTINCT(DILocalVariable,
                            (Context, tag.Val, scope.Val, name.Val, file.Val,
                             line.Val, type.Val, arg.Val, flags.Val));
   return false;
 }
 
-/// ParseMDExpression:
-///   ::= !MDExpression(0, 7, -1)
-bool LLParser::ParseMDExpression(MDNode *&Result, bool IsDistinct) {
+/// ParseDIExpression:
+///   ::= !DIExpression(0, 7, -1)
+bool LLParser::ParseDIExpression(MDNode *&Result, bool IsDistinct) {
   assert(Lex.getKind() == lltok::MetadataVar && "Expected metadata type name");
   Lex.Lex();
 
@@ -3778,14 +3778,14 @@
   if (ParseToken(lltok::rparen, "expected ')' here"))
     return true;
 
-  Result = GET_OR_DISTINCT(MDExpression, (Context, Elements));
+  Result = GET_OR_DISTINCT(DIExpression, (Context, Elements));
   return false;
 }
 
-/// ParseMDObjCProperty:
-///   ::= !MDObjCProperty(name: "foo", file: !1, line: 7, setter: "setFoo",
+/// ParseDIObjCProperty:
+///   ::= !DIObjCProperty(name: "foo", file: !1, line: 7, setter: "setFoo",
 ///                       getter: "getFoo", attributes: 7, type: !2)
-bool LLParser::ParseMDObjCProperty(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDIObjCProperty(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   OPTIONAL(name, MDStringField, );                                             \
   OPTIONAL(file, MDField, );                                                   \
@@ -3797,16 +3797,16 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDObjCProperty,
+  Result = GET_OR_DISTINCT(DIObjCProperty,
                            (Context, name.Val, file.Val, line.Val, setter.Val,
                             getter.Val, attributes.Val, type.Val));
   return false;
 }
 
-/// ParseMDImportedEntity:
-///   ::= !MDImportedEntity(tag: DW_TAG_imported_module, scope: !0, entity: !1,
+/// ParseDIImportedEntity:
+///   ::= !DIImportedEntity(tag: DW_TAG_imported_module, scope: !0, entity: !1,
 ///                         line: 7, name: "foo")
-bool LLParser::ParseMDImportedEntity(MDNode *&Result, bool IsDistinct) {
+bool LLParser::ParseDIImportedEntity(MDNode *&Result, bool IsDistinct) {
 #define VISIT_MD_FIELDS(OPTIONAL, REQUIRED)                                    \
   REQUIRED(tag, DwarfTagField, );                                              \
   REQUIRED(scope, MDField, );                                                  \
@@ -3816,7 +3816,7 @@
   PARSE_MD_FIELDS();
 #undef VISIT_MD_FIELDS
 
-  Result = GET_OR_DISTINCT(MDImportedEntity, (Context, tag.Val, scope.Val,
+  Result = GET_OR_DISTINCT(DIImportedEntity, (Context, tag.Val, scope.Val,
                                               entity.Val, line.Val, name.Val));
   return false;
 }
@@ -3871,7 +3871,7 @@
 ///  ::= !42
 ///  ::= !{...}
 ///  ::= !"string"
-///  ::= !MDLocation(...)
+///  ::= !DILocation(...)
 bool LLParser::ParseMetadata(Metadata *&MD, PerFunctionState *PFS) {
   if (Lex.getKind() == lltok::MetadataVar) {
     MDNode *N;
diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index b76b134..565e46b 100644
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -1724,7 +1724,7 @@
       Metadata *InlinedAt =
           Record[4] ? MDValueList.getValueFwdRef(Record[4] - 1) : nullptr;
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDLocation, Record[0],
+          GET_OR_DISTINCT(DILocation, Record[0],
                           (Context, Line, Column, Scope, InlinedAt)),
           NextMDValueNo++);
       break;
@@ -1744,7 +1744,7 @@
       for (unsigned I = 4, E = Record.size(); I != E; ++I)
         DwarfOps.push_back(Record[I] ? MDValueList.getValueFwdRef(Record[I] - 1)
                                      : nullptr);
-      MDValueList.AssignValue(GET_OR_DISTINCT(GenericDebugNode, Record[0],
+      MDValueList.AssignValue(GET_OR_DISTINCT(GenericDINode, Record[0],
                                               (Context, Tag, Header, DwarfOps)),
                               NextMDValueNo++);
       break;
@@ -1754,7 +1754,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDSubrange, Record[0],
+          GET_OR_DISTINCT(DISubrange, Record[0],
                           (Context, Record[1], unrotateSign(Record[2]))),
           NextMDValueNo++);
       break;
@@ -1763,7 +1763,7 @@
       if (Record.size() != 3)
         return Error("Invalid record");
 
-      MDValueList.AssignValue(GET_OR_DISTINCT(MDEnumerator, Record[0],
+      MDValueList.AssignValue(GET_OR_DISTINCT(DIEnumerator, Record[0],
                                               (Context, unrotateSign(Record[1]),
                                                getMDString(Record[2]))),
                               NextMDValueNo++);
@@ -1774,7 +1774,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDBasicType, Record[0],
+          GET_OR_DISTINCT(DIBasicType, Record[0],
                           (Context, Record[1], getMDString(Record[2]),
                            Record[3], Record[4], Record[5])),
           NextMDValueNo++);
@@ -1785,7 +1785,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDDerivedType, Record[0],
+          GET_OR_DISTINCT(DIDerivedType, Record[0],
                           (Context, Record[1], getMDString(Record[2]),
                            getMDOrNull(Record[3]), Record[4],
                            getMDOrNull(Record[5]), getMDOrNull(Record[6]),
@@ -1799,7 +1799,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDCompositeType, Record[0],
+          GET_OR_DISTINCT(DICompositeType, Record[0],
                           (Context, Record[1], getMDString(Record[2]),
                            getMDOrNull(Record[3]), Record[4],
                            getMDOrNull(Record[5]), getMDOrNull(Record[6]),
@@ -1815,7 +1815,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDSubroutineType, Record[0],
+          GET_OR_DISTINCT(DISubroutineType, Record[0],
                           (Context, Record[1], getMDOrNull(Record[2]))),
           NextMDValueNo++);
       break;
@@ -1825,7 +1825,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDFile, Record[0], (Context, getMDString(Record[1]),
+          GET_OR_DISTINCT(DIFile, Record[0], (Context, getMDString(Record[1]),
                                               getMDString(Record[2]))),
           NextMDValueNo++);
       break;
@@ -1835,7 +1835,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDCompileUnit, Record[0],
+          GET_OR_DISTINCT(DICompileUnit, Record[0],
                           (Context, Record[1], getMDOrNull(Record[2]),
                            getMDString(Record[3]), Record[4],
                            getMDString(Record[5]), Record[6],
@@ -1852,7 +1852,7 @@
 
       MDValueList.AssignValue(
           GET_OR_DISTINCT(
-              MDSubprogram, Record[0],
+              DISubprogram, Record[0],
               (Context, getMDOrNull(Record[1]), getMDString(Record[2]),
                getMDString(Record[3]), getMDOrNull(Record[4]), Record[5],
                getMDOrNull(Record[6]), Record[7], Record[8], Record[9],
@@ -1867,7 +1867,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDLexicalBlock, Record[0],
+          GET_OR_DISTINCT(DILexicalBlock, Record[0],
                           (Context, getMDOrNull(Record[1]),
                            getMDOrNull(Record[2]), Record[3], Record[4])),
           NextMDValueNo++);
@@ -1878,7 +1878,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDLexicalBlockFile, Record[0],
+          GET_OR_DISTINCT(DILexicalBlockFile, Record[0],
                           (Context, getMDOrNull(Record[1]),
                            getMDOrNull(Record[2]), Record[3])),
           NextMDValueNo++);
@@ -1889,7 +1889,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDNamespace, Record[0],
+          GET_OR_DISTINCT(DINamespace, Record[0],
                           (Context, getMDOrNull(Record[1]),
                            getMDOrNull(Record[2]), getMDString(Record[3]),
                            Record[4])),
@@ -1900,7 +1900,7 @@
       if (Record.size() != 3)
         return Error("Invalid record");
 
-      MDValueList.AssignValue(GET_OR_DISTINCT(MDTemplateTypeParameter,
+      MDValueList.AssignValue(GET_OR_DISTINCT(DITemplateTypeParameter,
                                               Record[0],
                                               (Context, getMDString(Record[1]),
                                                getMDOrNull(Record[2]))),
@@ -1912,7 +1912,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDTemplateValueParameter, Record[0],
+          GET_OR_DISTINCT(DITemplateValueParameter, Record[0],
                           (Context, Record[1], getMDString(Record[2]),
                            getMDOrNull(Record[3]), getMDOrNull(Record[4]))),
           NextMDValueNo++);
@@ -1923,7 +1923,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDGlobalVariable, Record[0],
+          GET_OR_DISTINCT(DIGlobalVariable, Record[0],
                           (Context, getMDOrNull(Record[1]),
                            getMDString(Record[2]), getMDString(Record[3]),
                            getMDOrNull(Record[4]), Record[5],
@@ -1938,7 +1938,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDLocalVariable, Record[0],
+          GET_OR_DISTINCT(DILocalVariable, Record[0],
                           (Context, Record[1], getMDOrNull(Record[2]),
                            getMDString(Record[3]), getMDOrNull(Record[4]),
                            Record[5], getMDOrNull(Record[6]), Record[7],
@@ -1951,7 +1951,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDExpression, Record[0],
+          GET_OR_DISTINCT(DIExpression, Record[0],
                           (Context, makeArrayRef(Record).slice(1))),
           NextMDValueNo++);
       break;
@@ -1961,7 +1961,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDObjCProperty, Record[0],
+          GET_OR_DISTINCT(DIObjCProperty, Record[0],
                           (Context, getMDString(Record[1]),
                            getMDOrNull(Record[2]), Record[3],
                            getMDString(Record[4]), getMDString(Record[5]),
@@ -1974,7 +1974,7 @@
         return Error("Invalid record");
 
       MDValueList.AssignValue(
-          GET_OR_DISTINCT(MDImportedEntity, Record[0],
+          GET_OR_DISTINCT(DIImportedEntity, Record[0],
                           (Context, Record[1], getMDOrNull(Record[2]),
                            getMDOrNull(Record[3]), Record[4],
                            getMDString(Record[5]))),
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 15b0106..85a6da3 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -784,7 +784,7 @@
   Record.clear();
 }
 
-static void WriteMDLocation(const MDLocation *N, const ValueEnumerator &VE,
+static void WriteDILocation(const DILocation *N, const ValueEnumerator &VE,
                             BitstreamWriter &Stream,
                             SmallVectorImpl<uint64_t> &Record,
                             unsigned Abbrev) {
@@ -798,11 +798,11 @@
   Record.clear();
 }
 
-static void WriteGenericDebugNode(const GenericDebugNode *N,
-                                  const ValueEnumerator &VE,
-                                  BitstreamWriter &Stream,
-                                  SmallVectorImpl<uint64_t> &Record,
-                                  unsigned Abbrev) {
+static void WriteGenericDINode(const GenericDINode *N,
+                               const ValueEnumerator &VE,
+                               BitstreamWriter &Stream,
+                               SmallVectorImpl<uint64_t> &Record,
+                               unsigned Abbrev) {
   Record.push_back(N->isDistinct());
   Record.push_back(N->getTag());
   Record.push_back(0); // Per-tag version field; unused for now.
@@ -819,7 +819,7 @@
   return I < 0 ? ~(U << 1) : U << 1;
 }
 
-static void WriteMDSubrange(const MDSubrange *N, const ValueEnumerator &,
+static void WriteDISubrange(const DISubrange *N, const ValueEnumerator &,
                             BitstreamWriter &Stream,
                             SmallVectorImpl<uint64_t> &Record,
                             unsigned Abbrev) {
@@ -831,7 +831,7 @@
   Record.clear();
 }
 
-static void WriteMDEnumerator(const MDEnumerator *N, const ValueEnumerator &VE,
+static void WriteDIEnumerator(const DIEnumerator *N, const ValueEnumerator &VE,
                               BitstreamWriter &Stream,
                               SmallVectorImpl<uint64_t> &Record,
                               unsigned Abbrev) {
@@ -843,7 +843,7 @@
   Record.clear();
 }
 
-static void WriteMDBasicType(const MDBasicType *N, const ValueEnumerator &VE,
+static void WriteDIBasicType(const DIBasicType *N, const ValueEnumerator &VE,
                              BitstreamWriter &Stream,
                              SmallVectorImpl<uint64_t> &Record,
                              unsigned Abbrev) {
@@ -858,7 +858,7 @@
   Record.clear();
 }
 
-static void WriteMDDerivedType(const MDDerivedType *N,
+static void WriteDIDerivedType(const DIDerivedType *N,
                                const ValueEnumerator &VE,
                                BitstreamWriter &Stream,
                                SmallVectorImpl<uint64_t> &Record,
@@ -880,7 +880,7 @@
   Record.clear();
 }
 
-static void WriteMDCompositeType(const MDCompositeType *N,
+static void WriteDICompositeType(const DICompositeType *N,
                                  const ValueEnumerator &VE,
                                  BitstreamWriter &Stream,
                                  SmallVectorImpl<uint64_t> &Record,
@@ -906,7 +906,7 @@
   Record.clear();
 }
 
-static void WriteMDSubroutineType(const MDSubroutineType *N,
+static void WriteDISubroutineType(const DISubroutineType *N,
                                   const ValueEnumerator &VE,
                                   BitstreamWriter &Stream,
                                   SmallVectorImpl<uint64_t> &Record,
@@ -919,7 +919,7 @@
   Record.clear();
 }
 
-static void WriteMDFile(const MDFile *N, const ValueEnumerator &VE,
+static void WriteDIFile(const DIFile *N, const ValueEnumerator &VE,
                         BitstreamWriter &Stream,
                         SmallVectorImpl<uint64_t> &Record, unsigned Abbrev) {
   Record.push_back(N->isDistinct());
@@ -930,7 +930,7 @@
   Record.clear();
 }
 
-static void WriteMDCompileUnit(const MDCompileUnit *N,
+static void WriteDICompileUnit(const DICompileUnit *N,
                                const ValueEnumerator &VE,
                                BitstreamWriter &Stream,
                                SmallVectorImpl<uint64_t> &Record,
@@ -954,11 +954,10 @@
   Record.clear();
 }
 
-static void WriteMDSubprogram(const MDSubprogram *N,
-                               const ValueEnumerator &VE,
-                               BitstreamWriter &Stream,
-                               SmallVectorImpl<uint64_t> &Record,
-                               unsigned Abbrev) {
+static void WriteDISubprogram(const DISubprogram *N, const ValueEnumerator &VE,
+                              BitstreamWriter &Stream,
+                              SmallVectorImpl<uint64_t> &Record,
+                              unsigned Abbrev) {
   Record.push_back(N->isDistinct());
   Record.push_back(VE.getMetadataOrNullID(N->getScope()));
   Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
@@ -983,11 +982,11 @@
   Record.clear();
 }
 
-static void WriteMDLexicalBlock(const MDLexicalBlock *N,
-                               const ValueEnumerator &VE,
-                               BitstreamWriter &Stream,
-                               SmallVectorImpl<uint64_t> &Record,
-                               unsigned Abbrev) {
+static void WriteDILexicalBlock(const DILexicalBlock *N,
+                                const ValueEnumerator &VE,
+                                BitstreamWriter &Stream,
+                                SmallVectorImpl<uint64_t> &Record,
+                                unsigned Abbrev) {
   Record.push_back(N->isDistinct());
   Record.push_back(VE.getMetadataOrNullID(N->getScope()));
   Record.push_back(VE.getMetadataOrNullID(N->getFile()));
@@ -998,7 +997,7 @@
   Record.clear();
 }
 
-static void WriteMDLexicalBlockFile(const MDLexicalBlockFile *N,
+static void WriteDILexicalBlockFile(const DILexicalBlockFile *N,
                                     const ValueEnumerator &VE,
                                     BitstreamWriter &Stream,
                                     SmallVectorImpl<uint64_t> &Record,
@@ -1012,7 +1011,7 @@
   Record.clear();
 }
 
-static void WriteMDNamespace(const MDNamespace *N, const ValueEnumerator &VE,
+static void WriteDINamespace(const DINamespace *N, const ValueEnumerator &VE,
                              BitstreamWriter &Stream,
                              SmallVectorImpl<uint64_t> &Record,
                              unsigned Abbrev) {
@@ -1026,7 +1025,7 @@
   Record.clear();
 }
 
-static void WriteMDTemplateTypeParameter(const MDTemplateTypeParameter *N,
+static void WriteDITemplateTypeParameter(const DITemplateTypeParameter *N,
                                          const ValueEnumerator &VE,
                                          BitstreamWriter &Stream,
                                          SmallVectorImpl<uint64_t> &Record,
@@ -1039,7 +1038,7 @@
   Record.clear();
 }
 
-static void WriteMDTemplateValueParameter(const MDTemplateValueParameter *N,
+static void WriteDITemplateValueParameter(const DITemplateValueParameter *N,
                                           const ValueEnumerator &VE,
                                           BitstreamWriter &Stream,
                                           SmallVectorImpl<uint64_t> &Record,
@@ -1054,7 +1053,7 @@
   Record.clear();
 }
 
-static void WriteMDGlobalVariable(const MDGlobalVariable *N,
+static void WriteDIGlobalVariable(const DIGlobalVariable *N,
                                   const ValueEnumerator &VE,
                                   BitstreamWriter &Stream,
                                   SmallVectorImpl<uint64_t> &Record,
@@ -1075,7 +1074,7 @@
   Record.clear();
 }
 
-static void WriteMDLocalVariable(const MDLocalVariable *N,
+static void WriteDILocalVariable(const DILocalVariable *N,
                                  const ValueEnumerator &VE,
                                  BitstreamWriter &Stream,
                                  SmallVectorImpl<uint64_t> &Record,
@@ -1094,7 +1093,7 @@
   Record.clear();
 }
 
-static void WriteMDExpression(const MDExpression *N, const ValueEnumerator &,
+static void WriteDIExpression(const DIExpression *N, const ValueEnumerator &,
                               BitstreamWriter &Stream,
                               SmallVectorImpl<uint64_t> &Record,
                               unsigned Abbrev) {
@@ -1107,11 +1106,11 @@
   Record.clear();
 }
 
-static void WriteMDObjCProperty(const MDObjCProperty *N,
-                                 const ValueEnumerator &VE,
-                                 BitstreamWriter &Stream,
-                                 SmallVectorImpl<uint64_t> &Record,
-                                 unsigned Abbrev) {
+static void WriteDIObjCProperty(const DIObjCProperty *N,
+                                const ValueEnumerator &VE,
+                                BitstreamWriter &Stream,
+                                SmallVectorImpl<uint64_t> &Record,
+                                unsigned Abbrev) {
   Record.push_back(N->isDistinct());
   Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
   Record.push_back(VE.getMetadataOrNullID(N->getFile()));
@@ -1125,7 +1124,7 @@
   Record.clear();
 }
 
-static void WriteMDImportedEntity(const MDImportedEntity *N,
+static void WriteDIImportedEntity(const DIImportedEntity *N,
                                   const ValueEnumerator &VE,
                                   BitstreamWriter &Stream,
                                   SmallVectorImpl<uint64_t> &Record,
@@ -1164,7 +1163,7 @@
 #define HANDLE_MDNODE_LEAF(CLASS) unsigned CLASS##Abbrev = 0;
 #include "llvm/IR/Metadata.def"
 
-  if (VE.hasMDLocation()) {
+  if (VE.hasDILocation()) {
     // Abbrev for METADATA_LOCATION.
     //
     // Assume the column is usually under 128, and always output the inlined-at
@@ -1176,10 +1175,10 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-    MDLocationAbbrev = Stream.EmitAbbrev(Abbv);
+    DILocationAbbrev = Stream.EmitAbbrev(Abbv);
   }
 
-  if (VE.hasGenericDebugNode()) {
+  if (VE.hasGenericDINode()) {
     // Abbrev for METADATA_GENERIC_DEBUG.
     //
     // Assume the column is usually under 128, and always output the inlined-at
@@ -1192,7 +1191,7 @@
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
     Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
-    GenericDebugNodeAbbrev = Stream.EmitAbbrev(Abbv);
+    GenericDINodeAbbrev = Stream.EmitAbbrev(Abbv);
   }
 
   unsigned NameAbbrev = 0;
@@ -2105,7 +2104,7 @@
 
   bool NeedsMetadataAttachment = F.hasMetadata();
 
-  MDLocation *LastDL = nullptr;
+  DILocation *LastDL = nullptr;
 
   // Finally, emit all the instructions, in order.
   for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
@@ -2120,7 +2119,7 @@
       NeedsMetadataAttachment |= I->hasMetadataOtherThanDebugLoc();
 
       // If the instruction has a debug location, emit it.
-      MDLocation *DL = I->getDebugLoc();
+      DILocation *DL = I->getDebugLoc();
       if (!DL)
         continue;
 
diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
index 652851f..6c517f5 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -285,7 +285,7 @@
 
 ValueEnumerator::ValueEnumerator(const Module &M,
                                  bool ShouldPreserveUseListOrder)
-    : HasMDString(false), HasMDLocation(false), HasGenericDebugNode(false),
+    : HasMDString(false), HasDILocation(false), HasGenericDINode(false),
       ShouldPreserveUseListOrder(ShouldPreserveUseListOrder) {
   if (ShouldPreserveUseListOrder)
     UseListOrders = predictUseListOrder(M);
@@ -382,7 +382,7 @@
 
         // Don't enumerate the location directly -- it has a special record
         // type -- but enumerate its operands.
-        if (MDLocation *L = I.getDebugLoc())
+        if (DILocation *L = I.getDebugLoc())
           EnumerateMDNodeOperands(L);
       }
   }
@@ -548,8 +548,8 @@
     EnumerateValue(C->getValue());
 
   HasMDString |= isa<MDString>(MD);
-  HasMDLocation |= isa<MDLocation>(MD);
-  HasGenericDebugNode |= isa<GenericDebugNode>(MD);
+  HasDILocation |= isa<DILocation>(MD);
+  HasGenericDINode |= isa<GenericDINode>(MD);
 
   // Replace the dummy ID inserted above with the correct one.  MDValueMap may
   // have changed by inserting operands, so we need a fresh lookup here.
diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.h b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
index ba245a3..92d166e 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.h
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.h
@@ -65,8 +65,8 @@
   typedef DenseMap<const Metadata *, unsigned> MetadataMapType;
   MetadataMapType MDValueMap;
   bool HasMDString;
-  bool HasMDLocation;
-  bool HasGenericDebugNode;
+  bool HasDILocation;
+  bool HasGenericDINode;
   bool ShouldPreserveUseListOrder;
 
   typedef DenseMap<AttributeSet, unsigned> AttributeGroupMapType;
@@ -121,8 +121,8 @@
   }
 
   bool hasMDString() const { return HasMDString; }
-  bool hasMDLocation() const { return HasMDLocation; }
-  bool hasGenericDebugNode() const { return HasGenericDebugNode; }
+  bool hasDILocation() const { return HasDILocation; }
+  bool hasGenericDINode() const { return HasGenericDINode; }
 
   bool shouldPreserveUseListOrder() const { return ShouldPreserveUseListOrder; }
 
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index a8fb9b7..d56a180 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -668,15 +668,15 @@
   raw_svector_ostream OS(Str);
   OS << "DEBUG_VALUE: ";
 
-  const MDLocalVariable *V = MI->getDebugVariable();
-  if (auto *SP = dyn_cast<MDSubprogram>(V->getScope())) {
+  const DILocalVariable *V = MI->getDebugVariable();
+  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
     StringRef Name = SP->getDisplayName();
     if (!Name.empty())
       OS << Name << ":";
   }
   OS << V->getName();
 
-  const MDExpression *Expr = MI->getDebugExpression();
+  const DIExpression *Expr = MI->getDebugExpression();
   if (Expr->isBitPiece())
     OS << " [bit_piece offset=" << Expr->getBitPieceOffset()
        << " size=" << Expr->getBitPieceSize() << "]";
diff --git a/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp b/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
index 9cb0aab..3c46a99 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
@@ -204,7 +204,7 @@
       // Use the base variable (without any DW_OP_piece expressions)
       // as index into History. The full variables including the
       // piece expressions are attached to the MI.
-      const MDLocalVariable *RawVar = MI.getDebugVariable();
+      const DILocalVariable *RawVar = MI.getDebugVariable();
       assert(RawVar->isValidLocationForIntrinsic(MI.getDebugLoc()) &&
              "Expected inlined-at fields to agree");
       InlinedVariable Var(RawVar, MI.getDebugLoc()->getInlinedAt());
diff --git a/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h b/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h
index c25aaff..546d1b4 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h
@@ -17,8 +17,8 @@
 
 class MachineFunction;
 class MachineInstr;
-class MDLocalVariable;
-class MDLocation;
+class DILocalVariable;
+class DILocation;
 class TargetRegisterInfo;
 
 // For each user variable, keep a list of instruction ranges where this variable
@@ -32,7 +32,7 @@
 public:
   typedef std::pair<const MachineInstr *, const MachineInstr *> InstrRange;
   typedef SmallVector<InstrRange, 4> InstrRanges;
-  typedef std::pair<const MDLocalVariable *, const MDLocation *>
+  typedef std::pair<const DILocalVariable *, const DILocation *>
       InlinedVariable;
   typedef MapVector<InlinedVariable, InstrRanges> InstrRangesMap;
 
diff --git a/llvm/lib/CodeGen/AsmPrinter/DebugLocEntry.h b/llvm/lib/CodeGen/AsmPrinter/DebugLocEntry.h
index ff3eb03..6a943c6 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DebugLocEntry.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DebugLocEntry.h
@@ -29,25 +29,25 @@
 public:
   /// \brief A single location or constant.
   struct Value {
-    Value(const MDExpression *Expr, int64_t i)
+    Value(const DIExpression *Expr, int64_t i)
         : Expression(Expr), EntryKind(E_Integer) {
       Constant.Int = i;
     }
-    Value(const MDExpression *Expr, const ConstantFP *CFP)
+    Value(const DIExpression *Expr, const ConstantFP *CFP)
         : Expression(Expr), EntryKind(E_ConstantFP) {
       Constant.CFP = CFP;
     }
-    Value(const MDExpression *Expr, const ConstantInt *CIP)
+    Value(const DIExpression *Expr, const ConstantInt *CIP)
         : Expression(Expr), EntryKind(E_ConstantInt) {
       Constant.CIP = CIP;
     }
-    Value(const MDExpression *Expr, MachineLocation Loc)
+    Value(const DIExpression *Expr, MachineLocation Loc)
         : Expression(Expr), EntryKind(E_Location), Loc(Loc) {
-      assert(cast<MDExpression>(Expr)->isValid());
+      assert(cast<DIExpression>(Expr)->isValid());
     }
 
     /// Any complex address location expression for this Value.
-    const MDExpression *Expression;
+    const DIExpression *Expression;
 
     /// Type of entry that this represents.
     enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
@@ -72,7 +72,7 @@
     const ConstantInt *getConstantInt() const { return Constant.CIP; }
     MachineLocation getLoc() const { return Loc; }
     bool isBitPiece() const { return getExpression()->isBitPiece(); }
-    const MDExpression *getExpression() const { return Expression; }
+    const DIExpression *getExpression() const { return Expression; }
     friend bool operator==(const Value &, const Value &);
     friend bool operator<(const Value &, const Value &);
   };
@@ -94,8 +94,8 @@
   /// Return true if the merge was successful.
   bool MergeValues(const DebugLocEntry &Next) {
     if (Begin == Next.Begin) {
-      auto *Expr = cast_or_null<MDExpression>(Values[0].Expression);
-      auto *NextExpr = cast_or_null<MDExpression>(Next.Values[0].Expression);
+      auto *Expr = cast_or_null<DIExpression>(Values[0].Expression);
+      auto *NextExpr = cast_or_null<DIExpression>(Next.Values[0].Expression);
       if (Expr->isBitPiece() && NextExpr->isBitPiece()) {
         addValues(Next.Values);
         End = Next.End;
@@ -143,7 +143,7 @@
 
   /// \brief Lower this entry into a DWARF expression.
   void finalize(const AsmPrinter &AP, DebugLocStream &Locs,
-                const MDBasicType *BT);
+                const DIBasicType *BT);
 };
 
 /// \brief Compare two Values for equality.
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 856920f..c10e703 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -16,7 +16,7 @@
 
 namespace llvm {
 
-DwarfCompileUnit::DwarfCompileUnit(unsigned UID, const MDCompileUnit *Node,
+DwarfCompileUnit::DwarfCompileUnit(unsigned UID, const DICompileUnit *Node,
                                    AsmPrinter *A, DwarfDebug *DW,
                                    DwarfFile *DWU)
     : DwarfUnit(UID, dwarf::DW_TAG_compile_unit, Node, A, DW, DWU),
@@ -98,7 +98,7 @@
 
 /// getOrCreateGlobalVariableDIE - get or create global variable DIE.
 DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(
-    const MDGlobalVariable *GV) {
+    const DIGlobalVariable *GV) {
   // Check for pre-existence.
   if (DIE *Die = getDIE(GV))
     return Die;
@@ -114,7 +114,7 @@
 
   // Add to map.
   DIE *VariableDIE = &createAndAddDIE(GV->getTag(), *ContextDIE, GV);
-  MDScope *DeclContext;
+  DIScope *DeclContext;
   if (auto *SDMDecl = GV->getStaticDataMemberDeclaration()) {
     DeclContext = resolve(SDMDecl->getScope());
     assert(SDMDecl->isStaticMember() && "Expected static member decl");
@@ -277,7 +277,7 @@
 // Find DIE for the given subprogram and attach appropriate DW_AT_low_pc
 // and DW_AT_high_pc attributes. If there are global variables in this
 // scope then create and insert DIEs for these variables.
-DIE &DwarfCompileUnit::updateSubprogramScopeDIE(const MDSubprogram *SP) {
+DIE &DwarfCompileUnit::updateSubprogramScopeDIE(const DISubprogram *SP) {
   DIE *SPDie = getOrCreateSubprogramDIE(SP, includeMinimalInlineScopes());
 
   attachLowHighPC(*SPDie, Asm->getFunctionBegin(), Asm->getFunctionEnd());
@@ -308,7 +308,7 @@
 
   auto *DS = Scope->getScopeNode();
 
-  assert((Scope->getInlinedAt() || !isa<MDSubprogram>(DS)) &&
+  assert((Scope->getInlinedAt() || !isa<DISubprogram>(DS)) &&
          "Only handle inlined subprograms here, use "
          "constructSubprogramScopeDIE for non-inlined "
          "subprograms");
@@ -319,7 +319,7 @@
   // avoid creating un-used children then removing them later when we find out
   // the scope DIE is null.
   std::unique_ptr<DIE> ScopeDIE;
-  if (Scope->getParent() && isa<MDSubprogram>(DS)) {
+  if (Scope->getParent() && isa<DISubprogram>(DS)) {
     ScopeDIE = constructInlinedScopeDIE(Scope);
     if (!ScopeDIE)
       return;
@@ -341,7 +341,7 @@
       // There is no need to emit empty lexical block DIE.
       for (const auto &E : DD->findImportedEntitiesForScope(DS))
         Children.push_back(
-            constructImportedEntityDIE(cast<MDImportedEntity>(E.second)));
+            constructImportedEntityDIE(cast<DIImportedEntity>(E.second)));
     }
 
     // If there are only other scopes as children, put them directly in the
@@ -432,7 +432,7 @@
   attachRangesOrLowHighPC(*ScopeDIE, Scope->getRanges());
 
   // Add the call site information to the DIE.
-  const MDLocation *IA = Scope->getInlinedAt();
+  const DILocation *IA = Scope->getInlinedAt();
   addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
           getOrCreateSourceID(IA->getFilename(), IA->getDirectory()));
   addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, IA->getLine());
@@ -563,14 +563,14 @@
   assert(Scope && Scope->getScopeNode());
   assert(!Scope->getInlinedAt());
   assert(!Scope->isAbstractScope());
-  auto *Sub = cast<MDSubprogram>(Scope->getScopeNode());
+  auto *Sub = cast<DISubprogram>(Scope->getScopeNode());
 
   DD->getProcessedSPNodes().insert(Sub);
 
   DIE &ScopeDIE = updateSubprogramScopeDIE(Sub);
 
   // If this is a variadic function, add an unspecified parameter.
-  MDTypeRefArray FnArgs = Sub->getType()->getTypeArray();
+  DITypeRefArray FnArgs = Sub->getType()->getTypeArray();
 
   // Collect lexical scope children first.
   // ObjectPointer might be a local (non-argument) local variable if it's a
@@ -605,7 +605,7 @@
   if (AbsDef)
     return;
 
-  auto *SP = cast<MDSubprogram>(Scope->getScopeNode());
+  auto *SP = cast<DISubprogram>(Scope->getScopeNode());
 
   DIE *ContextDIE;
 
@@ -633,18 +633,18 @@
 }
 
 std::unique_ptr<DIE>
-DwarfCompileUnit::constructImportedEntityDIE(const MDImportedEntity *Module) {
+DwarfCompileUnit::constructImportedEntityDIE(const DIImportedEntity *Module) {
   std::unique_ptr<DIE> IMDie = make_unique<DIE>((dwarf::Tag)Module->getTag());
   insertDIE(Module, IMDie.get());
   DIE *EntityDie;
   auto *Entity = resolve(Module->getEntity());
-  if (auto *NS = dyn_cast<MDNamespace>(Entity))
+  if (auto *NS = dyn_cast<DINamespace>(Entity))
     EntityDie = getOrCreateNameSpace(NS);
-  else if (auto *SP = dyn_cast<MDSubprogram>(Entity))
+  else if (auto *SP = dyn_cast<DISubprogram>(Entity))
     EntityDie = getOrCreateSubprogramDIE(SP);
-  else if (auto *T = dyn_cast<MDType>(Entity))
+  else if (auto *T = dyn_cast<DIType>(Entity))
     EntityDie = getOrCreateTypeDIE(T);
-  else if (auto *GV = dyn_cast<MDGlobalVariable>(Entity))
+  else if (auto *GV = dyn_cast<DIGlobalVariable>(Entity))
     EntityDie = getOrCreateGlobalVariableDIE(GV);
   else
     EntityDie = getDIE(Entity);
@@ -659,7 +659,7 @@
   return IMDie;
 }
 
-void DwarfCompileUnit::finishSubprogramDefinition(const MDSubprogram *SP) {
+void DwarfCompileUnit::finishSubprogramDefinition(const DISubprogram *SP) {
   DIE *D = getDIE(SP);
   if (DIE *AbsSPDIE = DU->getAbstractSPDies().lookup(SP)) {
     if (D)
@@ -676,7 +676,7 @@
       applySubprogramAttributesToDefinition(SP, *D);
   }
 }
-void DwarfCompileUnit::collectDeadVariables(const MDSubprogram *SP) {
+void DwarfCompileUnit::collectDeadVariables(const DISubprogram *SP) {
   assert(SP && "CU's subprogram list contains a non-subprogram");
   assert(SP->isDefinition() &&
          "CU's subprogram list contains a subprogram declaration");
@@ -688,7 +688,7 @@
   if (!SPDIE)
     SPDIE = getDIE(SP);
   assert(SPDIE);
-  for (const MDLocalVariable *DV : Variables) {
+  for (const DILocalVariable *DV : Variables) {
     DbgVariable NewVar(DV, /* IA */ nullptr, /* Expr */ nullptr, DD);
     auto VariableDie = constructVariableDIE(NewVar);
     applyVariableAttributes(NewVar, *VariableDie);
@@ -708,7 +708,7 @@
 
 /// addGlobalName - Add a new global name to the compile unit.
 void DwarfCompileUnit::addGlobalName(StringRef Name, DIE &Die,
-                                     const MDScope *Context) {
+                                     const DIScope *Context) {
   if (includeMinimalInlineScopes())
     return;
   std::string FullName = getParentContextString(Context) + Name.str();
@@ -716,8 +716,8 @@
 }
 
 /// Add a new global type to the unit.
-void DwarfCompileUnit::addGlobalType(const MDType *Ty, const DIE &Die,
-                                     const MDScope *Context) {
+void DwarfCompileUnit::addGlobalType(const DIType *Ty, const DIE &Die,
+                                     const DIScope *Context) {
   if (includeMinimalInlineScopes())
     return;
   std::string FullName = getParentContextString(Context) + Ty->getName().str();
@@ -764,7 +764,7 @@
   DIELoc *Loc = new (DIEValueAllocator) DIELoc();
   DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
   assert(DV.getExpression().size() == 1);
-  const MDExpression *Expr = DV.getExpression().back();
+  const DIExpression *Expr = DV.getExpression().back();
   bool ValidReg;
   if (Location.getOffset()) {
     ValidReg = DwarfExpr.AddMachineRegIndirect(Location.getReg(),
@@ -807,7 +807,7 @@
 }
 
 void DwarfCompileUnit::applySubprogramAttributesToDefinition(
-    const MDSubprogram *SP, DIE &SPDie) {
+    const DISubprogram *SP, DIE &SPDie) {
   auto *SPDecl = SP->getDeclaration();
   auto *Context = resolve(SPDecl ? SPDecl->getScope() : SP->getScope());
   applySubprogramAttributes(SP, SPDie, includeMinimalInlineScopes());
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
index 76811d9..50e4a54 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
@@ -66,7 +66,7 @@
   bool includeMinimalInlineScopes() const;
 
 public:
-  DwarfCompileUnit(unsigned UID, const MDCompileUnit *Node, AsmPrinter *A,
+  DwarfCompileUnit(unsigned UID, const DICompileUnit *Node, AsmPrinter *A,
                    DwarfDebug *DW, DwarfFile *DWU);
 
   DwarfCompileUnit *getSkeleton() const {
@@ -79,7 +79,7 @@
   void applyStmtList(DIE &D);
 
   /// getOrCreateGlobalVariableDIE - get or create global variable DIE.
-  DIE *getOrCreateGlobalVariableDIE(const MDGlobalVariable *GV);
+  DIE *getOrCreateGlobalVariableDIE(const DIGlobalVariable *GV);
 
   /// addLabelAddress - Add a dwarf label attribute data and value using
   /// either DW_FORM_addr or DW_FORM_GNU_addr_index.
@@ -113,7 +113,7 @@
   /// DW_AT_low_pc and DW_AT_high_pc attributes. If there are global
   /// variables in this scope then create and insert DIEs for these
   /// variables.
-  DIE &updateSubprogramScopeDIE(const MDSubprogram *SP);
+  DIE &updateSubprogramScopeDIE(const DISubprogram *SP);
 
   void constructScopeDIE(LexicalScope *Scope,
                          SmallVectorImpl<std::unique_ptr<DIE>> &FinalChildren);
@@ -156,11 +156,11 @@
 
   /// \brief Construct import_module DIE.
   std::unique_ptr<DIE>
-  constructImportedEntityDIE(const MDImportedEntity *Module);
+  constructImportedEntityDIE(const DIImportedEntity *Module);
 
-  void finishSubprogramDefinition(const MDSubprogram *SP);
+  void finishSubprogramDefinition(const DISubprogram *SP);
 
-  void collectDeadVariables(const MDSubprogram *SP);
+  void collectDeadVariables(const DISubprogram *SP);
 
   /// Set the skeleton unit associated with this unit.
   void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }
@@ -183,11 +183,11 @@
   }
 
   /// Add a new global name to the compile unit.
-  void addGlobalName(StringRef Name, DIE &Die, const MDScope *Context) override;
+  void addGlobalName(StringRef Name, DIE &Die, const DIScope *Context) override;
 
   /// Add a new global type to the compile unit.
-  void addGlobalType(const MDType *Ty, const DIE &Die,
-                     const MDScope *Context) override;
+  void addGlobalType(const DIType *Ty, const DIE &Die,
+                     const DIScope *Context) override;
 
   const StringMap<const DIE *> &getGlobalNames() const { return GlobalNames; }
   const StringMap<const DIE *> &getGlobalTypes() const { return GlobalTypes; }
@@ -215,7 +215,7 @@
   /// Add a Dwarf expression attribute data and value.
   void addExpr(DIELoc &Die, dwarf::Form Form, const MCExpr *Expr);
 
-  void applySubprogramAttributesToDefinition(const MDSubprogram *SP,
+  void applySubprogramAttributesToDefinition(const DISubprogram *SP,
                                              DIE &SPDie);
 
   /// getRangeLists - Get the vector of range lists.
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 345eea6..4f2b47f 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -130,7 +130,7 @@
 
 /// resolve - Look in the DwarfDebug map for the MDNode that
 /// corresponds to the reference.
-template <typename T> T *DbgVariable::resolve(TypedDebugNodeRef<T> Ref) const {
+template <typename T> T *DbgVariable::resolve(TypedDINodeRef<T> Ref) const {
   return DD->resolve(Ref);
 }
 
@@ -141,8 +141,8 @@
       ->isBlockByrefStruct();
 }
 
-const MDType *DbgVariable::getType() const {
-  MDType *Ty = Var->getType().resolve(DD->getTypeIdentifierMap());
+const DIType *DbgVariable::getType() const {
+  DIType *Ty = Var->getType().resolve(DD->getTypeIdentifierMap());
   // FIXME: isBlockByrefVariable should be reformulated in terms of complex
   // addresses instead.
   if (Ty->isBlockByrefStruct()) {
@@ -170,15 +170,15 @@
        have a DW_AT_location that tells the debugger how to unwind through
        the pointers and __Block_byref_x_VarName struct to find the actual
        value of the variable.  The function addBlockByrefType does this.  */
-    MDType *subType = Ty;
+    DIType *subType = Ty;
     uint16_t tag = Ty->getTag();
 
     if (tag == dwarf::DW_TAG_pointer_type)
-      subType = resolve(cast<MDDerivedType>(Ty)->getBaseType());
+      subType = resolve(cast<DIDerivedType>(Ty)->getBaseType());
 
-    auto Elements = cast<MDCompositeTypeBase>(subType)->getElements();
+    auto Elements = cast<DICompositeTypeBase>(subType)->getElements();
     for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
-      auto *DT = cast<MDDerivedTypeBase>(Elements[i]);
+      auto *DT = cast<DIDerivedTypeBase>(Elements[i]);
       if (getName() == DT->getName())
         return resolve(DT->getBaseType());
     }
@@ -277,7 +277,7 @@
 // TODO: Determine whether or not we should add names for programs
 // that do not have a DW_AT_name or DW_AT_linkage_name field - this
 // is only slightly different than the lookup of non-standard ObjC names.
-void DwarfDebug::addSubprogramNames(const MDSubprogram *SP, DIE &Die) {
+void DwarfDebug::addSubprogramNames(const DISubprogram *SP, DIE &Die) {
   if (!SP->isDefinition())
     return;
   addAccelName(SP->getName(), Die);
@@ -305,9 +305,9 @@
 bool DwarfDebug::isSubprogramContext(const MDNode *Context) {
   if (!Context)
     return false;
-  if (isa<MDSubprogram>(Context))
+  if (isa<DISubprogram>(Context))
     return true;
-  if (auto *T = dyn_cast<MDType>(Context))
+  if (auto *T = dyn_cast<DIType>(Context))
     return isSubprogramContext(resolve(T->getScope()));
   return false;
 }
@@ -364,7 +364,7 @@
 // Create new DwarfCompileUnit for the given metadata node with tag
 // DW_TAG_compile_unit.
 DwarfCompileUnit &
-DwarfDebug::constructDwarfCompileUnit(const MDCompileUnit *DIUnit) {
+DwarfDebug::constructDwarfCompileUnit(const DICompileUnit *DIUnit) {
   StringRef FN = DIUnit->getFilename();
   CompilationDir = DIUnit->getDirectory();
 
@@ -422,7 +422,7 @@
 }
 
 void DwarfDebug::constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
-                                                  const MDImportedEntity *N) {
+                                                  const DIImportedEntity *N) {
   if (DIE *D = TheCU.getOrCreateContextDIE(N->getScope()))
     D->addChild(TheCU.constructImportedEntityDIE(N));
 }
@@ -446,7 +446,7 @@
   SingleCU = CU_Nodes->getNumOperands() == 1;
 
   for (MDNode *N : CU_Nodes->operands()) {
-    auto *CUNode = cast<MDCompileUnit>(N);
+    auto *CUNode = cast<DICompileUnit>(N);
     DwarfCompileUnit &CU = constructDwarfCompileUnit(CUNode);
     for (auto *IE : CUNode->getImportedEntities())
       ScopesWithImportedEntities.push_back(std::make_pair(IE->getScope(), IE));
@@ -462,12 +462,12 @@
     for (auto *Ty : CUNode->getEnumTypes()) {
       // The enum types array by design contains pointers to
       // MDNodes rather than DIRefs. Unique them here.
-      CU.getOrCreateTypeDIE(cast<MDType>(resolve(Ty->getRef())));
+      CU.getOrCreateTypeDIE(cast<DIType>(resolve(Ty->getRef())));
     }
     for (auto *Ty : CUNode->getRetainedTypes()) {
       // The retained types array by design contains pointers to
       // MDNodes rather than DIRefs. Unique them here.
-      CU.getOrCreateTypeDIE(cast<MDType>(resolve(Ty->getRef())));
+      CU.getOrCreateTypeDIE(cast<DIType>(resolve(Ty->getRef())));
     }
     // Emit imported_modules last so that the relevant context is already
     // available.
@@ -501,7 +501,7 @@
 void DwarfDebug::finishSubprogramDefinitions() {
   for (const auto &P : SPMap)
     forBothCUs(*P.second, [&](DwarfCompileUnit &CU) {
-      CU.finishSubprogramDefinition(cast<MDSubprogram>(P.first));
+      CU.finishSubprogramDefinition(cast<DISubprogram>(P.first));
     });
 }
 
@@ -512,7 +512,7 @@
 
   if (NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu")) {
     for (MDNode *N : CU_Nodes->operands()) {
-      auto *TheCU = cast<MDCompileUnit>(N);
+      auto *TheCU = cast<DICompileUnit>(N);
       // Construct subprogram DIE and add variables DIEs.
       DwarfCompileUnit *SPCU =
           static_cast<DwarfCompileUnit *>(CUMap.lookup(TheCU));
@@ -662,7 +662,7 @@
 // Find abstract variable, if any, associated with Var.
 DbgVariable *
 DwarfDebug::getExistingAbstractVariable(InlinedVariable IV,
-                                        const MDLocalVariable *&Cleansed) {
+                                        const DILocalVariable *&Cleansed) {
   // More then one inlined variable corresponds to one abstract variable.
   Cleansed = IV.first;
   auto I = AbstractVariables.find(Cleansed);
@@ -672,11 +672,11 @@
 }
 
 DbgVariable *DwarfDebug::getExistingAbstractVariable(InlinedVariable IV) {
-  const MDLocalVariable *Cleansed;
+  const DILocalVariable *Cleansed;
   return getExistingAbstractVariable(IV, Cleansed);
 }
 
-void DwarfDebug::createAbstractVariable(const MDLocalVariable *Var,
+void DwarfDebug::createAbstractVariable(const DILocalVariable *Var,
                                         LexicalScope *Scope) {
   auto AbsDbgVariable =
       make_unique<DbgVariable>(Var, /* IA */ nullptr, /* Expr */ nullptr, this);
@@ -686,22 +686,22 @@
 
 void DwarfDebug::ensureAbstractVariableIsCreated(InlinedVariable IV,
                                                  const MDNode *ScopeNode) {
-  const MDLocalVariable *Cleansed = nullptr;
+  const DILocalVariable *Cleansed = nullptr;
   if (getExistingAbstractVariable(IV, Cleansed))
     return;
 
   createAbstractVariable(Cleansed, LScopes.getOrCreateAbstractScope(
-                                       cast<MDLocalScope>(ScopeNode)));
+                                       cast<DILocalScope>(ScopeNode)));
 }
 
 void DwarfDebug::ensureAbstractVariableIsCreatedIfScoped(
     InlinedVariable IV, const MDNode *ScopeNode) {
-  const MDLocalVariable *Cleansed = nullptr;
+  const DILocalVariable *Cleansed = nullptr;
   if (getExistingAbstractVariable(IV, Cleansed))
     return;
 
   if (LexicalScope *Scope =
-          LScopes.findAbstractScope(cast_or_null<MDLocalScope>(ScopeNode)))
+          LScopes.findAbstractScope(cast_or_null<DILocalScope>(ScopeNode)))
     createAbstractVariable(Cleansed, Scope);
 }
 
@@ -722,7 +722,7 @@
     if (!Scope)
       continue;
 
-    const MDExpression *Expr = cast_or_null<MDExpression>(VI.Expr);
+    const DIExpression *Expr = cast_or_null<DIExpression>(VI.Expr);
     ensureAbstractVariableIsCreatedIfScoped(Var, Scope->getScopeNode());
     auto RegVar =
         make_unique<DbgVariable>(Var.first, Var.second, Expr, this, VI.Slot);
@@ -733,7 +733,7 @@
 
 // Get .debug_loc entry for the instruction range starting at MI.
 static DebugLocEntry::Value getDebugLocValue(const MachineInstr *MI) {
-  const MDExpression *Expr = MI->getDebugExpression();
+  const DIExpression *Expr = MI->getDebugExpression();
 
   assert(MI->getNumOperands() == 4);
   if (MI->getOperand(0).isReg()) {
@@ -757,7 +757,7 @@
 }
 
 /// Determine whether two variable pieces overlap.
-static bool piecesOverlap(const MDExpression *P1, const MDExpression *P2) {
+static bool piecesOverlap(const DIExpression *P1, const DIExpression *P2) {
   if (!P1->isBitPiece() || !P2->isBitPiece())
     return true;
   unsigned l1 = P1->getBitPieceOffset();
@@ -809,7 +809,7 @@
     }
 
     // If this piece overlaps with any open ranges, truncate them.
-    const MDExpression *DIExpr = Begin->getDebugExpression();
+    const DIExpression *DIExpr = Begin->getDebugExpression();
     auto Last = std::remove_if(OpenRanges.begin(), OpenRanges.end(),
                                [&](DebugLocEntry::Value R) {
       return piecesOverlap(DIExpr, R.getExpression());
@@ -874,7 +874,7 @@
 
 // Find variables for each lexical scope.
 void DwarfDebug::collectVariableInfo(DwarfCompileUnit &TheCU,
-                                     const MDSubprogram *SP,
+                                     const DISubprogram *SP,
                                      DenseSet<InlinedVariable> &Processed) {
   // Grab the variable info that was squirreled away in the MMI side-table.
   collectVariableInfoFromMMITable(Processed);
@@ -890,7 +890,7 @@
       continue;
 
     LexicalScope *Scope = nullptr;
-    if (const MDLocation *IA = IV.second)
+    if (const DILocation *IA = IV.second)
       Scope = LScopes.findInlinedScope(IV.first->getScope(), IA);
     else
       Scope = LScopes.findLexicalScope(IV.first->getScope());
@@ -918,10 +918,10 @@
     SmallVector<DebugLocEntry, 8> Entries;
     buildLocationList(Entries, Ranges);
 
-    // If the variable has an MDBasicType, extract it.  Basic types cannot have
+    // If the variable has an DIBasicType, extract it.  Basic types cannot have
     // unique identifiers, so don't bother resolving the type with the
     // identifier map.
-    const MDBasicType *BT = dyn_cast<MDBasicType>(
+    const DIBasicType *BT = dyn_cast<DIBasicType>(
         static_cast<const Metadata *>(IV.first->getType()));
 
     // Finalize the entry by lowering it into a DWARF bytestream.
@@ -930,7 +930,7 @@
   }
 
   // Collect info for variables that were optimized out.
-  for (const MDLocalVariable *DV : SP->getVariables()) {
+  for (const DILocalVariable *DV : SP->getVariables()) {
     if (!Processed.insert(InlinedVariable(DV, nullptr)).second)
       continue;
     if (LexicalScope *Scope = LScopes.findLexicalScope(DV->getScope())) {
@@ -1128,14 +1128,14 @@
 
     // The first mention of a function argument gets the CurrentFnBegin
     // label, so arguments are visible when breaking at function entry.
-    const MDLocalVariable *DIVar = Ranges.front().first->getDebugVariable();
+    const DILocalVariable *DIVar = Ranges.front().first->getDebugVariable();
     if (DIVar->getTag() == dwarf::DW_TAG_arg_variable &&
         getDISubprogram(DIVar->getScope())->describes(MF->getFunction())) {
       LabelsBeforeInsn[Ranges.front().first] = Asm->getFunctionBegin();
       if (Ranges.front().first->getDebugExpression()->isBitPiece()) {
         // Mark all non-overlapping initial pieces.
         for (auto I = Ranges.begin(); I != Ranges.end(); ++I) {
-          const MDExpression *Piece = I->first->getDebugExpression();
+          const DIExpression *Piece = I->first->getDebugExpression();
           if (std::all_of(Ranges.begin(), I,
                           [&](DbgValueHistoryMap::InstrRange Pred) {
                 return !piecesOverlap(Piece, Pred.first->getDebugExpression());
@@ -1159,7 +1159,7 @@
 
   // Record beginning of function.
   PrologEndLoc = findPrologueEndLoc(MF);
-  if (MDLocation *L = PrologEndLoc) {
+  if (DILocation *L = PrologEndLoc) {
     // We'd like to list the prologue as "not statements" but GDB behaves
     // poorly if we do that. Revisit this with caution/GDB (7.5+) testing.
     auto *SP = L->getInlinedAtScope()->getSubprogram();
@@ -1186,7 +1186,7 @@
   Asm->OutStreamer->getContext().setDwarfCompileUnitID(0);
 
   LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
-  auto *SP = cast<MDSubprogram>(FnScope->getScopeNode());
+  auto *SP = cast<DISubprogram>(FnScope->getScopeNode());
   DwarfCompileUnit &TheCU = *SPMap.lookup(SP);
 
   DenseSet<InlinedVariable> ProcessedVars;
@@ -1216,9 +1216,9 @@
 #endif
   // Construct abstract scopes.
   for (LexicalScope *AScope : LScopes.getAbstractScopesList()) {
-    auto *SP = cast<MDSubprogram>(AScope->getScopeNode());
+    auto *SP = cast<DISubprogram>(AScope->getScopeNode());
     // Collect info for variables that were optimized out.
-    for (const MDLocalVariable *DV : SP->getVariables()) {
+    for (const DILocalVariable *DV : SP->getVariables()) {
       if (!ProcessedVars.insert(InlinedVariable(DV, nullptr)).second)
         continue;
       ensureAbstractVariableIsCreated(InlinedVariable(DV, nullptr),
@@ -1254,10 +1254,10 @@
   StringRef Dir;
   unsigned Src = 1;
   unsigned Discriminator = 0;
-  if (auto *Scope = cast_or_null<MDScope>(S)) {
+  if (auto *Scope = cast_or_null<DIScope>(S)) {
     Fn = Scope->getFilename();
     Dir = Scope->getDirectory();
-    if (auto *LBF = dyn_cast<MDLexicalBlockFile>(Scope))
+    if (auto *LBF = dyn_cast<DILexicalBlockFile>(Scope))
       Discriminator = LBF->getDiscriminator();
 
     unsigned CUID = Asm->OutStreamer->getContext().getDwarfCompileUnitID();
@@ -1471,7 +1471,7 @@
     Streamer.EmitInt8(Byte, Comment != End ? *(Comment++) : "");
 }
 
-static void emitDebugLocValue(const AsmPrinter &AP, const MDBasicType *BT,
+static void emitDebugLocValue(const AsmPrinter &AP, const DIBasicType *BT,
                               ByteStreamer &Streamer,
                               const DebugLocEntry::Value &Value,
                               unsigned PieceOffsetInBits) {
@@ -1487,7 +1487,7 @@
       DwarfExpr.AddUnsignedConstant(Value.getInt());
   } else if (Value.isLocation()) {
     MachineLocation Loc = Value.getLoc();
-    const MDExpression *Expr = Value.getExpression();
+    const DIExpression *Expr = Value.getExpression();
     if (!Expr || !Expr->getNumElements())
       // Regular entry.
       AP.EmitDwarfRegOp(Streamer, Loc);
@@ -1508,7 +1508,7 @@
 }
 
 void DebugLocEntry::finalize(const AsmPrinter &AP, DebugLocStream &Locs,
-                             const MDBasicType *BT) {
+                             const DIBasicType *BT) {
   Locs.startEntry(Begin, End);
   BufferByteStreamer Streamer = Locs.getStreamer();
   const DebugLocEntry::Value &Value = Values[0];
@@ -1522,7 +1522,7 @@
    
     unsigned Offset = 0;
     for (auto Piece : Values) {
-      const MDExpression *Expr = Piece.getExpression();
+      const DIExpression *Expr = Piece.getExpression();
       unsigned PieceOffset = Expr->getBitPieceOffset();
       unsigned PieceSize = Expr->getBitPieceSize();
       assert(Offset <= PieceOffset && "overlapping or duplicate pieces");
@@ -1903,7 +1903,7 @@
 
 void DwarfDebug::addDwarfTypeUnitType(DwarfCompileUnit &CU,
                                       StringRef Identifier, DIE &RefDie,
-                                      const MDCompositeType *CTy) {
+                                      const DICompositeType *CTy) {
   // Fast path if we're building some type units and one has already used the
   // address pool we know we're going to throw away all this work anyway, so
   // don't bother building dependent types.
@@ -1962,7 +1962,7 @@
       // This is inefficient because all the dependent types will be rebuilt
       // from scratch, including building them in type units, discovering that
       // they depend on addresses, throwing them out and rebuilding them.
-      CU.constructTypeDIE(RefDie, cast<MDCompositeType>(CTy));
+      CU.constructTypeDIE(RefDie, cast<DICompositeType>(CTy));
       return;
     }
 
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 708fb8f..59024a7 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -75,9 +75,9 @@
 /// - Variables that are described by multiple MMI table entries have multiple
 ///   expressions and frame indices.
 class DbgVariable {
-  const MDLocalVariable *Var; /// Variable Descriptor.
-  const MDLocation *IA;       /// Inlined at location.
-  SmallVector<const MDExpression *, 1>
+  const DILocalVariable *Var; /// Variable Descriptor.
+  const DILocation *IA;       /// Inlined at location.
+  SmallVector<const DIExpression *, 1>
       Expr;                          /// Complex address location expression.
   DIE *TheDIE;                /// Variable DIE.
   unsigned DebugLocListIndex;        /// Offset in DebugLocs.
@@ -87,8 +87,8 @@
 
 public:
   /// Construct a DbgVariable from a variable.
-  DbgVariable(const MDLocalVariable *V, const MDLocation *IA,
-              const MDExpression *E, DwarfDebug *DD, int FI = ~0)
+  DbgVariable(const DILocalVariable *V, const DILocation *IA,
+              const DIExpression *E, DwarfDebug *DD, int FI = ~0)
       : Var(V), IA(IA), Expr(1, E), TheDIE(nullptr), DebugLocListIndex(~0U),
         MInsn(nullptr), DD(DD) {
     FrameIndex.push_back(FI);
@@ -106,9 +106,9 @@
   }
 
   // Accessors.
-  const MDLocalVariable *getVariable() const { return Var; }
-  const MDLocation *getInlinedAt() const { return IA; }
-  const ArrayRef<const MDExpression *> getExpression() const { return Expr; }
+  const DILocalVariable *getVariable() const { return Var; }
+  const DILocation *getInlinedAt() const { return IA; }
+  const ArrayRef<const DIExpression *> getExpression() const { return Expr; }
   void setDIE(DIE &D) { TheDIE = &D; }
   DIE *getDIE() const { return TheDIE; }
   void setDebugLocListIndex(unsigned O) { DebugLocListIndex = O; }
@@ -130,7 +130,7 @@
       FrameIndex.append(FI.begin(), FI.end());
     }
     assert(Expr.size() > 1 ? std::all_of(Expr.begin(), Expr.end(),
-                                         [](const MDExpression *E) {
+                                         [](const DIExpression *E) {
                                            return E->isBitPiece();
                                          })
                            : (true && "conflicting locations for variable"));
@@ -167,12 +167,12 @@
     return Expr.back()->getNumElements() > 0;
   }
   bool isBlockByrefVariable() const;
-  const MDType *getType() const;
+  const DIType *getType() const;
 
 private:
   /// resolve - Look in the DwarfDebug map for the MDNode that
   /// corresponds to the reference.
-  template <typename T> T *resolve(TypedDebugNodeRef<T> Ref) const;
+  template <typename T> T *resolve(TypedDINodeRef<T> Ref) const;
 };
 
 
@@ -271,7 +271,7 @@
   DenseMap<const MDNode *, const DwarfTypeUnit *> DwarfTypeUnits;
 
   SmallVector<
-      std::pair<std::unique_ptr<DwarfTypeUnit>, const MDCompositeType *>, 1>
+      std::pair<std::unique_ptr<DwarfTypeUnit>, const DICompositeType *>, 1>
       TypeUnitsUnderConstruction;
 
   // Whether to emit the pubnames/pubtypes sections.
@@ -324,7 +324,7 @@
   DwarfAccelTable AccelNamespace;
   DwarfAccelTable AccelTypes;
 
-  DenseMap<const Function *, MDSubprogram *> FunctionDIs;
+  DenseMap<const Function *, DISubprogram *> FunctionDIs;
 
   MCDwarfDwoLineTable *getDwoLineTable(const DwarfCompileUnit &);
 
@@ -336,9 +336,9 @@
 
   /// \brief Find abstract variable associated with Var.
   DbgVariable *getExistingAbstractVariable(InlinedVariable IV,
-                                           const MDLocalVariable *&Cleansed);
+                                           const DILocalVariable *&Cleansed);
   DbgVariable *getExistingAbstractVariable(InlinedVariable IV);
-  void createAbstractVariable(const MDLocalVariable *DV, LexicalScope *Scope);
+  void createAbstractVariable(const DILocalVariable *DV, LexicalScope *Scope);
   void ensureAbstractVariableIsCreated(InlinedVariable Var,
                                        const MDNode *Scope);
   void ensureAbstractVariableIsCreatedIfScoped(InlinedVariable Var,
@@ -453,11 +453,11 @@
 
   /// \brief Create new DwarfCompileUnit for the given metadata node with tag
   /// DW_TAG_compile_unit.
-  DwarfCompileUnit &constructDwarfCompileUnit(const MDCompileUnit *DIUnit);
+  DwarfCompileUnit &constructDwarfCompileUnit(const DICompileUnit *DIUnit);
 
   /// \brief Construct imported_module or imported_declaration DIE.
   void constructAndAddImportedEntityDIE(DwarfCompileUnit &TheCU,
-                                        const MDImportedEntity *N);
+                                        const DIImportedEntity *N);
 
   /// \brief Register a source line with debug info. Returns the unique
   /// label that was emitted and which provides correspondence to the
@@ -470,7 +470,7 @@
   void identifyScopeMarkers();
 
   /// \brief Populate LexicalScope entries with variables' info.
-  void collectVariableInfo(DwarfCompileUnit &TheCU, const MDSubprogram *SP,
+  void collectVariableInfo(DwarfCompileUnit &TheCU, const DISubprogram *SP,
                            DenseSet<InlinedVariable> &ProcessedVars);
 
   /// \brief Build the location list for all DBG_VALUEs in the
@@ -522,7 +522,7 @@
   /// \brief Add a DIE to the set of types that we're going to pull into
   /// type units.
   void addDwarfTypeUnitType(DwarfCompileUnit &CU, StringRef Identifier,
-                            DIE &Die, const MDCompositeType *CTy);
+                            DIE &Die, const DICompositeType *CTy);
 
   /// \brief Add a label so that arange data can be generated for it.
   void addArangeLabel(SymbolCU SCU) { ArangeLabels.push_back(SCU); }
@@ -566,7 +566,7 @@
   void emitDebugLocEntryLocation(const DebugLocStream::Entry &Entry);
 
   /// Find the MDNode for the given reference.
-  template <typename T> T *resolve(TypedDebugNodeRef<T> Ref) const {
+  template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
     return Ref.resolve(TypeIdentifierMap);
   }
 
@@ -583,7 +583,7 @@
   /// or another context nested inside a subprogram.
   bool isSubprogramContext(const MDNode *Context);
 
-  void addSubprogramNames(const MDSubprogram *SP, DIE &Die);
+  void addSubprogramNames(const DISubprogram *SP, DIE &Die);
 
   AddressPool &getAddressPool() { return AddrPool; }
 
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.cpp
index fbe209a..a2799b8 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.cpp
@@ -192,7 +192,7 @@
   return OffsetInBits;
 }
 
-bool DwarfExpression::AddMachineRegExpression(const MDExpression *Expr,
+bool DwarfExpression::AddMachineRegExpression(const DIExpression *Expr,
                                               unsigned MachineReg,
                                               unsigned PieceOffsetInBits) {
   auto I = Expr->expr_op_begin();
@@ -240,8 +240,8 @@
   return true;
 }
 
-void DwarfExpression::AddExpression(MDExpression::expr_op_iterator I,
-                                    MDExpression::expr_op_iterator E,
+void DwarfExpression::AddExpression(DIExpression::expr_op_iterator I,
+                                    DIExpression::expr_op_iterator E,
                                     unsigned PieceOffsetInBits) {
   for (; I != E; ++I) {
     switch (I->getOp()) {
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.h b/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.h
index 3b77a44..78ec937 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfExpression.h
@@ -93,13 +93,13 @@
   /// \param PieceOffsetInBits If this is one piece out of a fragmented
   /// location, this is the offset of the piece inside the entire variable.
   /// \return false if no DWARF register exists for MachineReg.
-  bool AddMachineRegExpression(const MDExpression *Expr, unsigned MachineReg,
+  bool AddMachineRegExpression(const DIExpression *Expr, unsigned MachineReg,
                                unsigned PieceOffsetInBits = 0);
   /// Emit a the operations remaining the DIExpressionIterator I.
   /// \param PieceOffsetInBits If this is one piece out of a fragmented
   /// location, this is the offset of the piece inside the entire variable.
-  void AddExpression(MDExpression::expr_op_iterator I,
-                     MDExpression::expr_op_iterator E,
+  void AddExpression(DIExpression::expr_op_iterator I,
+                     DIExpression::expr_op_iterator E,
                      unsigned PieceOffsetInBits = 0);
 };
 
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp
index 50dbb41..1d6298c 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp
@@ -137,7 +137,7 @@
 
 bool DwarfFile::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
   SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
-  const MDLocalVariable *DV = Var->getVariable();
+  const DILocalVariable *DV = Var->getVariable();
   // Variables with positive arg numbers are parameters.
   if (unsigned ArgNum = DV->getArg()) {
     // Keep all parameters in order at the start of the variable list to ensure
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h b/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
index 19bb347..a3a5e99 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
@@ -56,7 +56,7 @@
   /// Maps MDNodes for type system with the corresponding DIEs. These DIEs can
   /// be shared across CUs, that is why we keep the map here instead
   /// of in DwarfCompileUnit.
-  DenseMap<const MDNode *, DIE *> MDTypeNodeToDieMap;
+  DenseMap<const MDNode *, DIE *> DITypeNodeToDieMap;
 
 public:
   DwarfFile(AsmPrinter *AP, StringRef Pref, BumpPtrAllocator &DA);
@@ -103,10 +103,10 @@
   }
 
   void insertDIE(const MDNode *TypeMD, DIE *Die) {
-    MDTypeNodeToDieMap.insert(std::make_pair(TypeMD, Die));
+    DITypeNodeToDieMap.insert(std::make_pair(TypeMD, Die));
   }
   DIE *getDIE(const MDNode *TypeMD) {
-    return MDTypeNodeToDieMap.lookup(TypeMD);
+    return DITypeNodeToDieMap.lookup(TypeMD);
   }
 };
 }
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
index b721077..ee233f7 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -64,7 +64,7 @@
 }
 
 DwarfUnit::DwarfUnit(unsigned UID, dwarf::Tag UnitTag,
-                     const MDCompileUnit *Node, AsmPrinter *A, DwarfDebug *DW,
+                     const DICompileUnit *Node, AsmPrinter *A, DwarfDebug *DW,
                      DwarfFile *DWU)
     : UniqueID(UID), CUNode(Node), UnitDie(UnitTag), DebugInfoOffset(0), Asm(A),
       DD(DW), DU(DWU), IndexTyDie(nullptr), Section(nullptr) {
@@ -161,7 +161,7 @@
 }
 
 /// Check whether the DIE for this MDNode can be shared across CUs.
-static bool isShareableAcrossCUs(const DebugNode *D) {
+static bool isShareableAcrossCUs(const DINode *D) {
   // When the MDNode can be part of the type system, the DIE can be shared
   // across CUs.
   // Combining type units and cross-CU DIE sharing is lower value (since
@@ -169,18 +169,18 @@
   // level already) but may be implementable for some value in projects
   // building multiple independent libraries with LTO and then linking those
   // together.
-  return (isa<MDType>(D) ||
-          (isa<MDSubprogram>(D) && !cast<MDSubprogram>(D)->isDefinition())) &&
+  return (isa<DIType>(D) ||
+          (isa<DISubprogram>(D) && !cast<DISubprogram>(D)->isDefinition())) &&
          !GenerateDwarfTypeUnits;
 }
 
-DIE *DwarfUnit::getDIE(const DebugNode *D) const {
+DIE *DwarfUnit::getDIE(const DINode *D) const {
   if (isShareableAcrossCUs(D))
     return DU->getDIE(D);
   return MDNodeToDieMap.lookup(D);
 }
 
-void DwarfUnit::insertDIE(const DebugNode *Desc, DIE *D) {
+void DwarfUnit::insertDIE(const DINode *Desc, DIE *D) {
   if (isShareableAcrossCUs(Desc)) {
     DU->insertDIE(Desc, D);
     return;
@@ -320,7 +320,7 @@
                Entry);
 }
 
-DIE &DwarfUnit::createAndAddDIE(unsigned Tag, DIE &Parent, const DebugNode *N) {
+DIE &DwarfUnit::createAndAddDIE(unsigned Tag, DIE &Parent, const DINode *N) {
   assert(Tag != dwarf::DW_TAG_auto_variable &&
          Tag != dwarf::DW_TAG_arg_variable);
   Parent.addChild(make_unique<DIE>((dwarf::Tag)Tag));
@@ -354,38 +354,38 @@
   addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
 }
 
-void DwarfUnit::addSourceLine(DIE &Die, const MDLocalVariable *V) {
+void DwarfUnit::addSourceLine(DIE &Die, const DILocalVariable *V) {
   assert(V);
 
   addSourceLine(Die, V->getLine(), V->getScope()->getFilename(),
                 V->getScope()->getDirectory());
 }
 
-void DwarfUnit::addSourceLine(DIE &Die, const MDGlobalVariable *G) {
+void DwarfUnit::addSourceLine(DIE &Die, const DIGlobalVariable *G) {
   assert(G);
 
   addSourceLine(Die, G->getLine(), G->getFilename(), G->getDirectory());
 }
 
-void DwarfUnit::addSourceLine(DIE &Die, const MDSubprogram *SP) {
+void DwarfUnit::addSourceLine(DIE &Die, const DISubprogram *SP) {
   assert(SP);
 
   addSourceLine(Die, SP->getLine(), SP->getFilename(), SP->getDirectory());
 }
 
-void DwarfUnit::addSourceLine(DIE &Die, const MDType *Ty) {
+void DwarfUnit::addSourceLine(DIE &Die, const DIType *Ty) {
   assert(Ty);
 
   addSourceLine(Die, Ty->getLine(), Ty->getFilename(), Ty->getDirectory());
 }
 
-void DwarfUnit::addSourceLine(DIE &Die, const MDObjCProperty *Ty) {
+void DwarfUnit::addSourceLine(DIE &Die, const DIObjCProperty *Ty) {
   assert(Ty);
 
   addSourceLine(Die, Ty->getLine(), Ty->getFilename(), Ty->getDirectory());
 }
 
-void DwarfUnit::addSourceLine(DIE &Die, const MDNamespace *NS) {
+void DwarfUnit::addSourceLine(DIE &Die, const DINamespace *NS) {
   addSourceLine(Die, NS->getLine(), NS->getFilename(), NS->getDirectory());
 }
 
@@ -459,27 +459,27 @@
 void DwarfUnit::addBlockByrefAddress(const DbgVariable &DV, DIE &Die,
                                      dwarf::Attribute Attribute,
                                      const MachineLocation &Location) {
-  const MDType *Ty = DV.getType();
-  const MDType *TmpTy = Ty;
+  const DIType *Ty = DV.getType();
+  const DIType *TmpTy = Ty;
   uint16_t Tag = Ty->getTag();
   bool isPointer = false;
 
   StringRef varName = DV.getName();
 
   if (Tag == dwarf::DW_TAG_pointer_type) {
-    auto *DTy = cast<MDDerivedType>(Ty);
+    auto *DTy = cast<DIDerivedType>(Ty);
     TmpTy = resolve(DTy->getBaseType());
     isPointer = true;
   }
 
   // Find the __forwarding field and the variable field in the __Block_byref
   // struct.
-  DebugNodeArray Fields = cast<MDCompositeTypeBase>(TmpTy)->getElements();
-  const MDDerivedType *varField = nullptr;
-  const MDDerivedType *forwardingField = nullptr;
+  DINodeArray Fields = cast<DICompositeTypeBase>(TmpTy)->getElements();
+  const DIDerivedType *varField = nullptr;
+  const DIDerivedType *forwardingField = nullptr;
 
   for (unsigned i = 0, N = Fields.size(); i < N; ++i) {
-    auto *DT = cast<MDDerivedType>(Fields[i]);
+    auto *DT = cast<DIDerivedType>(Fields[i]);
     StringRef fieldName = DT->getName();
     if (fieldName == "__forwarding")
       forwardingField = DT;
@@ -534,8 +534,8 @@
 }
 
 /// Return true if type encoding is unsigned.
-static bool isUnsignedDIType(DwarfDebug *DD, const MDType *Ty) {
-  if (auto *DTy = dyn_cast<MDDerivedTypeBase>(Ty)) {
+static bool isUnsignedDIType(DwarfDebug *DD, const DIType *Ty) {
+  if (auto *DTy = dyn_cast<DIDerivedTypeBase>(Ty)) {
     dwarf::Tag T = (dwarf::Tag)Ty->getTag();
     // Encode pointer constants as unsigned bytes. This is used at least for
     // null pointer constant emission.
@@ -557,7 +557,7 @@
            T == dwarf::DW_TAG_volatile_type ||
            T == dwarf::DW_TAG_restrict_type ||
            T == dwarf::DW_TAG_enumeration_type);
-    if (MDTypeRef Deriv = DTy->getBaseType())
+    if (DITypeRef Deriv = DTy->getBaseType())
       return isUnsignedDIType(DD, DD->resolve(Deriv));
     // FIXME: Enums without a fixed underlying type have unknown signedness
     // here, leading to incorrectly emitted constants.
@@ -565,7 +565,7 @@
     return false;
   }
 
-  auto *BTy = cast<MDBasicType>(Ty);
+  auto *BTy = cast<DIBasicType>(Ty);
   unsigned Encoding = BTy->getEncoding();
   assert((Encoding == dwarf::DW_ATE_unsigned ||
           Encoding == dwarf::DW_ATE_unsigned_char ||
@@ -583,7 +583,7 @@
 }
 
 /// If this type is derived from a base type then return base type size.
-static uint64_t getBaseTypeSize(DwarfDebug *DD, const MDDerivedType *Ty) {
+static uint64_t getBaseTypeSize(DwarfDebug *DD, const DIDerivedType *Ty) {
   unsigned Tag = Ty->getTag();
 
   if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
@@ -602,7 +602,7 @@
       BaseType->getTag() == dwarf::DW_TAG_rvalue_reference_type)
     return Ty->getSizeInBits();
 
-  if (auto *DT = dyn_cast<MDDerivedType>(BaseType))
+  if (auto *DT = dyn_cast<DIDerivedType>(BaseType))
     return getBaseTypeSize(DD, DT);
 
   return BaseType->getSizeInBits();
@@ -636,12 +636,12 @@
 }
 
 void DwarfUnit::addConstantValue(DIE &Die, const ConstantInt *CI,
-                                 const MDType *Ty) {
+                                 const DIType *Ty) {
   addConstantValue(Die, CI->getValue(), Ty);
 }
 
 void DwarfUnit::addConstantValue(DIE &Die, const MachineOperand &MO,
-                                 const MDType *Ty) {
+                                 const DIType *Ty) {
   assert(MO.isImm() && "Invalid machine operand!");
 
   addConstantValue(Die, isUnsignedDIType(DD, Ty), MO.getImm());
@@ -654,7 +654,7 @@
           Unsigned ? dwarf::DW_FORM_udata : dwarf::DW_FORM_sdata, Val);
 }
 
-void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, const MDType *Ty) {
+void DwarfUnit::addConstantValue(DIE &Die, const APInt &Val, const DIType *Ty) {
   addConstantValue(Die, Val, isUnsignedDIType(DD, Ty));
 }
 
@@ -695,29 +695,29 @@
               GlobalValue::getRealLinkageName(LinkageName));
 }
 
-void DwarfUnit::addTemplateParams(DIE &Buffer, DebugNodeArray TParams) {
+void DwarfUnit::addTemplateParams(DIE &Buffer, DINodeArray TParams) {
   // Add template parameters.
   for (const auto *Element : TParams) {
-    if (auto *TTP = dyn_cast<MDTemplateTypeParameter>(Element))
+    if (auto *TTP = dyn_cast<DITemplateTypeParameter>(Element))
       constructTemplateTypeParameterDIE(Buffer, TTP);
-    else if (auto *TVP = dyn_cast<MDTemplateValueParameter>(Element))
+    else if (auto *TVP = dyn_cast<DITemplateValueParameter>(Element))
       constructTemplateValueParameterDIE(Buffer, TVP);
   }
 }
 
-DIE *DwarfUnit::getOrCreateContextDIE(const MDScope *Context) {
-  if (!Context || isa<MDFile>(Context))
+DIE *DwarfUnit::getOrCreateContextDIE(const DIScope *Context) {
+  if (!Context || isa<DIFile>(Context))
     return &getUnitDie();
-  if (auto *T = dyn_cast<MDType>(Context))
+  if (auto *T = dyn_cast<DIType>(Context))
     return getOrCreateTypeDIE(T);
-  if (auto *NS = dyn_cast<MDNamespace>(Context))
+  if (auto *NS = dyn_cast<DINamespace>(Context))
     return getOrCreateNameSpace(NS);
-  if (auto *SP = dyn_cast<MDSubprogram>(Context))
+  if (auto *SP = dyn_cast<DISubprogram>(Context))
     return getOrCreateSubprogramDIE(SP);
   return getDIE(Context);
 }
 
-DIE *DwarfUnit::createTypeDIE(const MDCompositeType *Ty) {
+DIE *DwarfUnit::createTypeDIE(const DICompositeType *Ty) {
   auto *Context = resolve(Ty->getScope());
   DIE *ContextDIE = getOrCreateContextDIE(Context);
 
@@ -727,7 +727,7 @@
   // Create new type.
   DIE &TyDIE = createAndAddDIE(Ty->getTag(), *ContextDIE, Ty);
 
-  constructTypeDIE(TyDIE, cast<MDCompositeType>(Ty));
+  constructTypeDIE(TyDIE, cast<DICompositeType>(Ty));
 
   updateAcceleratorTables(Context, Ty, TyDIE);
   return &TyDIE;
@@ -737,14 +737,13 @@
   if (!TyNode)
     return nullptr;
 
-  auto *Ty = cast<MDType>(TyNode);
+  auto *Ty = cast<DIType>(TyNode);
   assert(Ty == resolve(Ty->getRef()) &&
          "type was not uniqued, possible ODR violation.");
 
   // DW_TAG_restrict_type is not supported in DWARF2
   if (Ty->getTag() == dwarf::DW_TAG_restrict_type && DD->getDwarfVersion() <= 2)
-    return getOrCreateTypeDIE(
-        resolve(cast<MDDerivedType>(Ty)->getBaseType()));
+    return getOrCreateTypeDIE(resolve(cast<DIDerivedType>(Ty)->getBaseType()));
 
   // Construct the context before querying for the existence of the DIE in case
   // such construction creates the DIE.
@@ -760,11 +759,11 @@
 
   updateAcceleratorTables(Context, Ty, TyDIE);
 
-  if (auto *BT = dyn_cast<MDBasicType>(Ty))
+  if (auto *BT = dyn_cast<DIBasicType>(Ty))
     constructTypeDIE(TyDIE, BT);
-  else if (auto *STy = dyn_cast<MDSubroutineType>(Ty))
+  else if (auto *STy = dyn_cast<DISubroutineType>(Ty))
     constructTypeDIE(TyDIE, STy);
-  else if (auto *CTy = dyn_cast<MDCompositeType>(Ty)) {
+  else if (auto *CTy = dyn_cast<DICompositeType>(Ty)) {
     if (GenerateDwarfTypeUnits && !Ty->isForwardDecl())
       if (MDString *TypeId = CTy->getRawIdentifier()) {
         DD->addDwarfTypeUnitType(getCU(), TypeId->getString(), TyDIE, CTy);
@@ -773,17 +772,17 @@
       }
     constructTypeDIE(TyDIE, CTy);
   } else {
-    constructTypeDIE(TyDIE, cast<MDDerivedType>(Ty));
+    constructTypeDIE(TyDIE, cast<DIDerivedType>(Ty));
   }
 
   return &TyDIE;
 }
 
-void DwarfUnit::updateAcceleratorTables(const MDScope *Context,
-                                        const MDType *Ty, const DIE &TyDIE) {
+void DwarfUnit::updateAcceleratorTables(const DIScope *Context,
+                                        const DIType *Ty, const DIE &TyDIE) {
   if (!Ty->getName().empty() && !Ty->isForwardDecl()) {
     bool IsImplementation = 0;
-    if (auto *CT = dyn_cast<MDCompositeTypeBase>(Ty)) {
+    if (auto *CT = dyn_cast<DICompositeTypeBase>(Ty)) {
       // A runtime language of 0 actually means C/C++ and that any
       // non-negative value is some version of Objective-C/C++.
       IsImplementation = CT->getRuntimeLang() == 0 || CT->isObjcClassComplete();
@@ -791,13 +790,13 @@
     unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
     DD->addAccelType(Ty->getName(), TyDIE, Flags);
 
-    if (!Context || isa<MDCompileUnit>(Context) || isa<MDFile>(Context) ||
-        isa<MDNamespace>(Context))
+    if (!Context || isa<DICompileUnit>(Context) || isa<DIFile>(Context) ||
+        isa<DINamespace>(Context))
       addGlobalType(Ty, TyDIE, Context);
   }
 }
 
-void DwarfUnit::addType(DIE &Entity, const MDType *Ty,
+void DwarfUnit::addType(DIE &Entity, const DIType *Ty,
                         dwarf::Attribute Attribute) {
   assert(Ty && "Trying to add a type that doesn't exist?");
 
@@ -818,7 +817,7 @@
   addDIEEntry(Entity, Attribute, Entry);
 }
 
-std::string DwarfUnit::getParentContextString(const MDScope *Context) const {
+std::string DwarfUnit::getParentContextString(const DIScope *Context) const {
   if (!Context)
     return "";
 
@@ -827,8 +826,8 @@
     return "";
 
   std::string CS;
-  SmallVector<const MDScope *, 1> Parents;
-  while (!isa<MDCompileUnit>(Context)) {
+  SmallVector<const DIScope *, 1> Parents;
+  while (!isa<DICompileUnit>(Context)) {
     Parents.push_back(Context);
     if (Context->getScope())
       Context = resolve(Context->getScope());
@@ -841,9 +840,9 @@
   // Reverse iterate over our list to go from the outermost construct to the
   // innermost.
   for (auto I = Parents.rbegin(), E = Parents.rend(); I != E; ++I) {
-    const MDScope *Ctx = *I;
+    const DIScope *Ctx = *I;
     StringRef Name = Ctx->getName();
-    if (Name.empty() && isa<MDNamespace>(Ctx))
+    if (Name.empty() && isa<DINamespace>(Ctx))
       Name = "(anonymous namespace)";
     if (!Name.empty()) {
       CS += Name;
@@ -853,7 +852,7 @@
   return CS;
 }
 
-void DwarfUnit::constructTypeDIE(DIE &Buffer, const MDBasicType *BTy) {
+void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIBasicType *BTy) {
   // Get core information.
   StringRef Name = BTy->getName();
   // Add name if not anonymous or intermediate type.
@@ -871,14 +870,14 @@
   addUInt(Buffer, dwarf::DW_AT_byte_size, None, Size);
 }
 
-void DwarfUnit::constructTypeDIE(DIE &Buffer, const MDDerivedType *DTy) {
+void DwarfUnit::constructTypeDIE(DIE &Buffer, const DIDerivedType *DTy) {
   // Get core information.
   StringRef Name = DTy->getName();
   uint64_t Size = DTy->getSizeInBits() >> 3;
   uint16_t Tag = Buffer.getTag();
 
   // Map to main type, void will not have a type.
-  const MDType *FromTy = resolve(DTy->getBaseType());
+  const DIType *FromTy = resolve(DTy->getBaseType());
   if (FromTy)
     addType(Buffer, FromTy);
 
@@ -894,15 +893,15 @@
   if (Tag == dwarf::DW_TAG_ptr_to_member_type)
     addDIEEntry(
         Buffer, dwarf::DW_AT_containing_type,
-        *getOrCreateTypeDIE(resolve(cast<MDDerivedType>(DTy)->getClassType())));
+        *getOrCreateTypeDIE(resolve(cast<DIDerivedType>(DTy)->getClassType())));
   // Add source line info if available and TyDesc is not a forward declaration.
   if (!DTy->isForwardDecl())
     addSourceLine(Buffer, DTy);
 }
 
-void DwarfUnit::constructSubprogramArguments(DIE &Buffer, MDTypeRefArray Args) {
+void DwarfUnit::constructSubprogramArguments(DIE &Buffer, DITypeRefArray Args) {
   for (unsigned i = 1, N = Args.size(); i < N; ++i) {
-    const MDType *Ty = resolve(Args[i]);
+    const DIType *Ty = resolve(Args[i]);
     if (!Ty) {
       assert(i == N-1 && "Unspecified parameter must be the last argument");
       createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
@@ -915,9 +914,9 @@
   }
 }
 
-void DwarfUnit::constructTypeDIE(DIE &Buffer, const MDSubroutineType *CTy) {
+void DwarfUnit::constructTypeDIE(DIE &Buffer, const DISubroutineType *CTy) {
   // Add return type.  A void return won't have a type.
-  auto Elements = cast<MDSubroutineType>(CTy)->getTypeArray();
+  auto Elements = cast<DISubroutineType>(CTy)->getTypeArray();
   if (Elements.size())
     if (auto RTy = resolve(Elements[0]))
       addType(Buffer, RTy);
@@ -943,7 +942,7 @@
     addFlag(Buffer, dwarf::DW_AT_rvalue_reference);
 }
 
-void DwarfUnit::constructTypeDIE(DIE &Buffer, const MDCompositeType *CTy) {
+void DwarfUnit::constructTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
   // Add name if not anonymous or intermediate type.
   StringRef Name = CTy->getName();
 
@@ -961,13 +960,13 @@
   case dwarf::DW_TAG_union_type:
   case dwarf::DW_TAG_class_type: {
     // Add elements to structure type.
-    DebugNodeArray Elements = CTy->getElements();
+    DINodeArray Elements = CTy->getElements();
     for (const auto *Element : Elements) {
       if (!Element)
         continue;
-      if (auto *SP = dyn_cast<MDSubprogram>(Element))
+      if (auto *SP = dyn_cast<DISubprogram>(Element))
         getOrCreateSubprogramDIE(SP);
-      else if (auto *DDTy = dyn_cast<MDDerivedType>(Element)) {
+      else if (auto *DDTy = dyn_cast<DIDerivedType>(Element)) {
         if (DDTy->getTag() == dwarf::DW_TAG_friend) {
           DIE &ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
           addType(ElemDie, resolve(DDTy->getBaseType()), dwarf::DW_AT_friend);
@@ -976,7 +975,7 @@
         } else {
           constructMemberDIE(Buffer, DDTy);
         }
-      } else if (auto *Property = dyn_cast<MDObjCProperty>(Element)) {
+      } else if (auto *Property = dyn_cast<DIObjCProperty>(Element)) {
         DIE &ElemDie = createAndAddDIE(Property->getTag(), Buffer);
         StringRef PropertyName = Property->getName();
         addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
@@ -1007,7 +1006,7 @@
     // This is outside the DWARF spec, but GDB expects a DW_AT_containing_type
     // inside C++ composite types to point to the base class with the vtable.
     if (auto *ContainingType =
-            dyn_cast_or_null<MDCompositeType>(resolve(CTy->getVTableHolder())))
+            dyn_cast_or_null<DICompositeType>(resolve(CTy->getVTableHolder())))
       addDIEEntry(Buffer, dwarf::DW_AT_containing_type,
                   *getOrCreateTypeDIE(ContainingType));
 
@@ -1058,7 +1057,7 @@
 }
 
 void DwarfUnit::constructTemplateTypeParameterDIE(
-    DIE &Buffer, const MDTemplateTypeParameter *TP) {
+    DIE &Buffer, const DITemplateTypeParameter *TP) {
   DIE &ParamDIE =
       createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
   // Add the type if it exists, it could be void and therefore no type.
@@ -1069,7 +1068,7 @@
 }
 
 void DwarfUnit::constructTemplateValueParameterDIE(
-    DIE &Buffer, const MDTemplateValueParameter *VP) {
+    DIE &Buffer, const DITemplateValueParameter *VP) {
   DIE &ParamDIE = createAndAddDIE(VP->getTag(), Buffer);
 
   // Add the type if there is one, template template and template parameter
@@ -1100,7 +1099,7 @@
   }
 }
 
-DIE *DwarfUnit::getOrCreateNameSpace(const MDNamespace *NS) {
+DIE *DwarfUnit::getOrCreateNameSpace(const DINamespace *NS) {
   // Construct the context before querying for the existence of the DIE in case
   // such construction creates the DIE.
   DIE *ContextDIE = getOrCreateContextDIE(NS->getScope());
@@ -1120,7 +1119,7 @@
   return &NDie;
 }
 
-DIE *DwarfUnit::getOrCreateSubprogramDIE(const MDSubprogram *SP, bool Minimal) {
+DIE *DwarfUnit::getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal) {
   // Construct the context before querying for the existence of the DIE in case
   // such construction creates the DIE (as is the case for member function
   // declarations).
@@ -1151,7 +1150,7 @@
   return &SPDie;
 }
 
-bool DwarfUnit::applySubprogramDefinitionAttributes(const MDSubprogram *SP,
+bool DwarfUnit::applySubprogramDefinitionAttributes(const DISubprogram *SP,
                                                     DIE &SPDie) {
   DIE *DeclDie = nullptr;
   StringRef DeclLinkageName;
@@ -1183,7 +1182,7 @@
   return true;
 }
 
-void DwarfUnit::applySubprogramAttributes(const MDSubprogram *SP, DIE &SPDie,
+void DwarfUnit::applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie,
                                           bool Minimal) {
   if (!Minimal)
     if (applySubprogramDefinitionAttributes(SP, SPDie))
@@ -1207,7 +1206,7 @@
        Language == dwarf::DW_LANG_ObjC))
     addFlag(SPDie, dwarf::DW_AT_prototyped);
 
-  const MDSubroutineType *SPTy = SP->getType();
+  const DISubroutineType *SPTy = SP->getType();
   assert(SPTy->getTag() == dwarf::DW_TAG_subroutine_type &&
          "the type of a subprogram should be a subroutine");
 
@@ -1269,7 +1268,7 @@
     addFlag(SPDie, dwarf::DW_AT_explicit);
 }
 
-void DwarfUnit::constructSubrangeDIE(DIE &Buffer, const MDSubrange *SR,
+void DwarfUnit::constructSubrangeDIE(DIE &Buffer, const DISubrange *SR,
                                      DIE *IndexTy) {
   DIE &DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
   addDIEEntry(DW_Subrange, dwarf::DW_AT_type, *IndexTy);
@@ -1303,7 +1302,7 @@
   return IndexTyDie;
 }
 
-void DwarfUnit::constructArrayTypeDIE(DIE &Buffer, const MDCompositeType *CTy) {
+void DwarfUnit::constructArrayTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
   if (CTy->isVector())
     addFlag(Buffer, dwarf::DW_AT_GNU_vector);
 
@@ -1316,21 +1315,21 @@
   DIE *IdxTy = getIndexTyDie();
 
   // Add subranges to array type.
-  DebugNodeArray Elements = CTy->getElements();
+  DINodeArray Elements = CTy->getElements();
   for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
     // FIXME: Should this really be such a loose cast?
-    if (auto *Element = dyn_cast_or_null<DebugNode>(Elements[i]))
+    if (auto *Element = dyn_cast_or_null<DINode>(Elements[i]))
       if (Element->getTag() == dwarf::DW_TAG_subrange_type)
-        constructSubrangeDIE(Buffer, cast<MDSubrange>(Element), IdxTy);
+        constructSubrangeDIE(Buffer, cast<DISubrange>(Element), IdxTy);
   }
 }
 
-void DwarfUnit::constructEnumTypeDIE(DIE &Buffer, const MDCompositeType *CTy) {
-  DebugNodeArray Elements = CTy->getElements();
+void DwarfUnit::constructEnumTypeDIE(DIE &Buffer, const DICompositeType *CTy) {
+  DINodeArray Elements = CTy->getElements();
 
   // Add enumerators to enumeration type.
   for (unsigned i = 0, N = Elements.size(); i < N; ++i) {
-    auto *Enum = dyn_cast_or_null<MDEnumerator>(Elements[i]);
+    auto *Enum = dyn_cast_or_null<DIEnumerator>(Elements[i]);
     if (Enum) {
       DIE &Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
       StringRef Name = Enum->getName();
@@ -1340,7 +1339,7 @@
               Value);
     }
   }
-  const MDType *DTy = resolve(CTy->getBaseType());
+  const DIType *DTy = resolve(CTy->getBaseType());
   if (DTy) {
     addType(Buffer, DTy);
     addFlag(Buffer, dwarf::DW_AT_enum_class);
@@ -1351,7 +1350,7 @@
   for (auto CI = ContainingTypeMap.begin(), CE = ContainingTypeMap.end();
        CI != CE; ++CI) {
     DIE &SPDie = *CI->first;
-    const DebugNode *D = CI->second;
+    const DINode *D = CI->second;
     if (!D)
       continue;
     DIE *NDie = getDIE(D);
@@ -1361,7 +1360,7 @@
   }
 }
 
-void DwarfUnit::constructMemberDIE(DIE &Buffer, const MDDerivedType *DT) {
+void DwarfUnit::constructMemberDIE(DIE &Buffer, const DIDerivedType *DT) {
   DIE &MemberDie = createAndAddDIE(DT->getTag(), Buffer);
   StringRef Name = DT->getName();
   if (!Name.empty())
@@ -1449,7 +1448,7 @@
     addFlag(MemberDie, dwarf::DW_AT_artificial);
 }
 
-DIE *DwarfUnit::getOrCreateStaticMemberDIE(const MDDerivedType *DT) {
+DIE *DwarfUnit::getOrCreateStaticMemberDIE(const DIDerivedType *DT) {
   if (!DT)
     return nullptr;
 
@@ -1464,7 +1463,7 @@
 
   DIE &StaticMemberDIE = createAndAddDIE(DT->getTag(), *ContextDIE, DT);
 
-  const MDType *Ty = resolve(DT->getBaseType());
+  const DIType *Ty = resolve(DT->getBaseType());
 
   addString(StaticMemberDIE, dwarf::DW_AT_name, DT->getName());
   addType(StaticMemberDIE, Ty);
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
index 1cbf348..a0ea3c87 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
@@ -71,7 +71,7 @@
   unsigned UniqueID;
 
   /// MDNode for the compile unit.
-  const MDCompileUnit *CUNode;
+  const DICompileUnit *CUNode;
 
   /// Unit debug information entry.
   DIE UnitDie;
@@ -106,7 +106,7 @@
   /// This map is used to keep track of subprogram DIEs that need
   /// DW_AT_containing_type attribute. This attribute points to a DIE that
   /// corresponds to the MDNode mapped with the subprogram DIE.
-  DenseMap<DIE *, const DebugNode *> ContainingTypeMap;
+  DenseMap<DIE *, const DINode *> ContainingTypeMap;
 
   // All DIEValues are allocated through this allocator.
   BumpPtrAllocator DIEValueAllocator;
@@ -117,7 +117,7 @@
   /// The section this unit will be emitted in.
   const MCSection *Section;
 
-  DwarfUnit(unsigned UID, dwarf::Tag, const MDCompileUnit *CU, AsmPrinter *A,
+  DwarfUnit(unsigned UID, dwarf::Tag, const DICompileUnit *CU, AsmPrinter *A,
             DwarfDebug *DW, DwarfFile *DWU);
 
   /// \brief Add a string attribute data and value.
@@ -127,7 +127,7 @@
 
   void addIndexedString(DIE &Die, dwarf::Attribute Attribute, StringRef Str);
 
-  bool applySubprogramDefinitionAttributes(const MDSubprogram *SP, DIE &SPDie);
+  bool applySubprogramDefinitionAttributes(const DISubprogram *SP, DIE &SPDie);
 
 public:
   virtual ~DwarfUnit();
@@ -143,7 +143,7 @@
   AsmPrinter* getAsmPrinter() const { return Asm; }
   unsigned getUniqueID() const { return UniqueID; }
   uint16_t getLanguage() const { return CUNode->getSourceLanguage(); }
-  const MDCompileUnit *getCUNode() const { return CUNode; }
+  const DICompileUnit *getCUNode() const { return CUNode; }
   DIE &getUnitDie() { return UnitDie; }
 
   unsigned getDebugInfoOffset() const { return DebugInfoOffset; }
@@ -159,15 +159,15 @@
   /// metadata level because DIEs may not currently have been added to the
   /// parent context and walking the DIEs looking for names is more expensive
   /// than walking the metadata.
-  std::string getParentContextString(const MDScope *Context) const;
+  std::string getParentContextString(const DIScope *Context) const;
 
   /// Add a new global name to the compile unit.
-  virtual void addGlobalName(StringRef Name, DIE &Die, const MDScope *Context) {
+  virtual void addGlobalName(StringRef Name, DIE &Die, const DIScope *Context) {
   }
 
   /// Add a new global type to the compile unit.
-  virtual void addGlobalType(const MDType *Ty, const DIE &Die,
-                             const MDScope *Context) {}
+  virtual void addGlobalType(const DIType *Ty, const DIE &Die,
+                             const DIScope *Context) {}
 
   /// \brief Add a new name to the namespace accelerator table.
   void addAccelNamespace(StringRef Name, const DIE &Die);
@@ -177,7 +177,7 @@
   /// We delegate the request to DwarfDebug when the MDNode can be part of the
   /// type system, since DIEs for the type system can be shared across CUs and
   /// the mappings are kept in DwarfDebug.
-  DIE *getDIE(const DebugNode *D) const;
+  DIE *getDIE(const DINode *D) const;
 
   /// \brief Returns a fresh newly allocated DIELoc.
   DIELoc *getDIELoc() { return new (DIEValueAllocator) DIELoc(); }
@@ -187,7 +187,7 @@
   /// We delegate the request to DwarfDebug when the MDNode can be part of the
   /// type system, since DIEs for the type system can be shared across CUs and
   /// the mappings are kept in DwarfDebug.
-  void insertDIE(const DebugNode *Desc, DIE *D);
+  void insertDIE(const DINode *Desc, DIE *D);
 
   /// \brief Add a flag that is true to the DIE.
   void addFlag(DIE &Die, dwarf::Attribute Attribute);
@@ -246,17 +246,17 @@
   /// \brief Add location information to specified debug information entry.
   void addSourceLine(DIE &Die, unsigned Line, StringRef File,
                      StringRef Directory);
-  void addSourceLine(DIE &Die, const MDLocalVariable *V);
-  void addSourceLine(DIE &Die, const MDGlobalVariable *G);
-  void addSourceLine(DIE &Die, const MDSubprogram *SP);
-  void addSourceLine(DIE &Die, const MDType *Ty);
-  void addSourceLine(DIE &Die, const MDNamespace *NS);
-  void addSourceLine(DIE &Die, const MDObjCProperty *Ty);
+  void addSourceLine(DIE &Die, const DILocalVariable *V);
+  void addSourceLine(DIE &Die, const DIGlobalVariable *G);
+  void addSourceLine(DIE &Die, const DISubprogram *SP);
+  void addSourceLine(DIE &Die, const DIType *Ty);
+  void addSourceLine(DIE &Die, const DINamespace *NS);
+  void addSourceLine(DIE &Die, const DIObjCProperty *Ty);
 
   /// \brief Add constant value entry in variable DIE.
-  void addConstantValue(DIE &Die, const MachineOperand &MO, const MDType *Ty);
-  void addConstantValue(DIE &Die, const ConstantInt *CI, const MDType *Ty);
-  void addConstantValue(DIE &Die, const APInt &Val, const MDType *Ty);
+  void addConstantValue(DIE &Die, const MachineOperand &MO, const DIType *Ty);
+  void addConstantValue(DIE &Die, const ConstantInt *CI, const DIType *Ty);
+  void addConstantValue(DIE &Die, const APInt &Val, const DIType *Ty);
   void addConstantValue(DIE &Die, const APInt &Val, bool Unsigned);
   void addConstantValue(DIE &Die, bool Unsigned, uint64_t Val);
 
@@ -268,7 +268,7 @@
   void addLinkageName(DIE &Die, StringRef LinkageName);
 
   /// \brief Add template parameters in buffer.
-  void addTemplateParams(DIE &Buffer, DebugNodeArray TParams);
+  void addTemplateParams(DIE &Buffer, DINodeArray TParams);
 
   /// \brief Add register operand.
   /// \returns false if the register does not exist, e.g., because it was never
@@ -294,33 +294,33 @@
   ///
   /// This takes and attribute parameter because DW_AT_friend attributes are
   /// also type references.
-  void addType(DIE &Entity, const MDType *Ty,
+  void addType(DIE &Entity, const DIType *Ty,
                dwarf::Attribute Attribute = dwarf::DW_AT_type);
 
-  DIE *getOrCreateNameSpace(const MDNamespace *NS);
-  DIE *getOrCreateSubprogramDIE(const MDSubprogram *SP, bool Minimal = false);
+  DIE *getOrCreateNameSpace(const DINamespace *NS);
+  DIE *getOrCreateSubprogramDIE(const DISubprogram *SP, bool Minimal = false);
 
-  void applySubprogramAttributes(const MDSubprogram *SP, DIE &SPDie,
+  void applySubprogramAttributes(const DISubprogram *SP, DIE &SPDie,
                                  bool Minimal = false);
 
   /// \brief Find existing DIE or create new DIE for the given type.
   DIE *getOrCreateTypeDIE(const MDNode *N);
 
   /// \brief Get context owner's DIE.
-  DIE *createTypeDIE(const MDCompositeType *Ty);
+  DIE *createTypeDIE(const DICompositeType *Ty);
 
   /// \brief Get context owner's DIE.
-  DIE *getOrCreateContextDIE(const MDScope *Context);
+  DIE *getOrCreateContextDIE(const DIScope *Context);
 
   /// \brief Construct DIEs for types that contain vtables.
   void constructContainingTypeDIEs();
 
   /// \brief Construct function argument DIEs.
-  void constructSubprogramArguments(DIE &Buffer, MDTypeRefArray Args);
+  void constructSubprogramArguments(DIE &Buffer, DITypeRefArray Args);
 
   /// Create a DIE with the given Tag, add the DIE to its parent, and
   /// call insertDIE if MD is not null.
-  DIE &createAndAddDIE(unsigned Tag, DIE &Parent, const DebugNode *N = nullptr);
+  DIE &createAndAddDIE(unsigned Tag, DIE &Parent, const DINode *N = nullptr);
 
   /// Compute the size of a header for this unit, not including the initial
   /// length field.
@@ -335,11 +335,11 @@
 
   virtual DwarfCompileUnit &getCU() = 0;
 
-  void constructTypeDIE(DIE &Buffer, const MDCompositeType *CTy);
+  void constructTypeDIE(DIE &Buffer, const DICompositeType *CTy);
 
 protected:
   /// \brief Create new static data member DIE.
-  DIE *getOrCreateStaticMemberDIE(const MDDerivedType *DT);
+  DIE *getOrCreateStaticMemberDIE(const DIDerivedType *DT);
 
   /// Look up the source ID with the given directory and source file names. If
   /// none currently exists, create a new ID and insert it in the line table.
@@ -347,22 +347,22 @@
 
   /// \brief Look in the DwarfDebug map for the MDNode that corresponds to the
   /// reference.
-  template <typename T> T *resolve(TypedDebugNodeRef<T> Ref) const {
+  template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
     return DD->resolve(Ref);
   }
 
 private:
-  void constructTypeDIE(DIE &Buffer, const MDBasicType *BTy);
-  void constructTypeDIE(DIE &Buffer, const MDDerivedType *DTy);
-  void constructTypeDIE(DIE &Buffer, const MDSubroutineType *DTy);
-  void constructSubrangeDIE(DIE &Buffer, const MDSubrange *SR, DIE *IndexTy);
-  void constructArrayTypeDIE(DIE &Buffer, const MDCompositeType *CTy);
-  void constructEnumTypeDIE(DIE &Buffer, const MDCompositeType *CTy);
-  void constructMemberDIE(DIE &Buffer, const MDDerivedType *DT);
+  void constructTypeDIE(DIE &Buffer, const DIBasicType *BTy);
+  void constructTypeDIE(DIE &Buffer, const DIDerivedType *DTy);
+  void constructTypeDIE(DIE &Buffer, const DISubroutineType *DTy);
+  void constructSubrangeDIE(DIE &Buffer, const DISubrange *SR, DIE *IndexTy);
+  void constructArrayTypeDIE(DIE &Buffer, const DICompositeType *CTy);
+  void constructEnumTypeDIE(DIE &Buffer, const DICompositeType *CTy);
+  void constructMemberDIE(DIE &Buffer, const DIDerivedType *DT);
   void constructTemplateTypeParameterDIE(DIE &Buffer,
-                                         const MDTemplateTypeParameter *TP);
+                                         const DITemplateTypeParameter *TP);
   void constructTemplateValueParameterDIE(DIE &Buffer,
-                                          const MDTemplateValueParameter *TVP);
+                                          const DITemplateValueParameter *TVP);
 
   /// \brief Return the default lower bound for an array.
   ///
@@ -391,7 +391,7 @@
 
   /// If this is a named finished type then include it in the list of types for
   /// the accelerator tables.
-  void updateAcceleratorTables(const MDScope *Context, const MDType *Ty,
+  void updateAcceleratorTables(const DIScope *Context, const DIType *Ty,
                                const DIE &TyDIE);
 
   virtual bool isDwoUnit() const = 0;
diff --git a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
index ff21781..f394aba 100644
--- a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
@@ -20,11 +20,11 @@
 
 StringRef WinCodeViewLineTables::getFullFilepath(const MDNode *S) {
   assert(S);
-  assert((isa<MDCompileUnit>(S) || isa<MDFile>(S) || isa<MDSubprogram>(S) ||
-          isa<MDLexicalBlockBase>(S)) &&
+  assert((isa<DICompileUnit>(S) || isa<DIFile>(S) || isa<DISubprogram>(S) ||
+          isa<DILexicalBlockBase>(S)) &&
          "Unexpected scope info");
 
-  auto *Scope = cast<MDScope>(S);
+  auto *Scope = cast<DIScope>(S);
   StringRef Dir = Scope->getDirectory(),
             Filename = Scope->getFilename();
   char *&Result = DirAndFilenameToFilepathMap[std::make_pair(Dir, Filename)];
diff --git a/llvm/lib/CodeGen/InlineSpiller.cpp b/llvm/lib/CodeGen/InlineSpiller.cpp
index c7e7e58..59a9289 100644
--- a/llvm/lib/CodeGen/InlineSpiller.cpp
+++ b/llvm/lib/CodeGen/InlineSpiller.cpp
@@ -1232,7 +1232,7 @@
       DebugLoc DL = MI->getDebugLoc();
       DEBUG(dbgs() << "Modifying debug info due to spill:" << "\t" << *MI);
       MachineBasicBlock *MBB = MI->getParent();
-      assert(cast<MDLocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
+      assert(cast<DILocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
              "Expected inlined-at fields to agree");
       BuildMI(*MBB, MBB->erase(MI), DL, TII.get(TargetOpcode::DBG_VALUE))
           .addFrameIndex(StackSlot)
diff --git a/llvm/lib/CodeGen/LexicalScopes.cpp b/llvm/lib/CodeGen/LexicalScopes.cpp
index d6998d6..be61a20 100644
--- a/llvm/lib/CodeGen/LexicalScopes.cpp
+++ b/llvm/lib/CodeGen/LexicalScopes.cpp
@@ -59,10 +59,10 @@
   for (const auto &MBB : *MF) {
     const MachineInstr *RangeBeginMI = nullptr;
     const MachineInstr *PrevMI = nullptr;
-    const MDLocation *PrevDL = nullptr;
+    const DILocation *PrevDL = nullptr;
     for (const auto &MInsn : MBB) {
       // Check if instruction has valid location information.
-      const MDLocation *MIDL = MInsn.getDebugLoc();
+      const DILocation *MIDL = MInsn.getDebugLoc();
       if (!MIDL) {
         PrevMI = &MInsn;
         continue;
@@ -106,14 +106,14 @@
 
 /// findLexicalScope - Find lexical scope, either regular or inlined, for the
 /// given DebugLoc. Return NULL if not found.
-LexicalScope *LexicalScopes::findLexicalScope(const MDLocation *DL) {
-  MDLocalScope *Scope = DL->getScope();
+LexicalScope *LexicalScopes::findLexicalScope(const DILocation *DL) {
+  DILocalScope *Scope = DL->getScope();
   if (!Scope)
     return nullptr;
 
   // The scope that we were created with could have an extra file - which
   // isn't what we care about in this case.
-  if (auto *File = dyn_cast<MDLexicalBlockFile>(Scope))
+  if (auto *File = dyn_cast<DILexicalBlockFile>(Scope))
     Scope = File->getScope();
 
   if (auto *IA = DL->getInlinedAt()) {
@@ -125,8 +125,8 @@
 
 /// getOrCreateLexicalScope - Find lexical scope for the given DebugLoc. If
 /// not available then create new lexical scope.
-LexicalScope *LexicalScopes::getOrCreateLexicalScope(const MDLocalScope *Scope,
-                                                     const MDLocation *IA) {
+LexicalScope *LexicalScopes::getOrCreateLexicalScope(const DILocalScope *Scope,
+                                                     const DILocation *IA) {
   if (IA) {
     // Create an abstract scope for inlined function.
     getOrCreateAbstractScope(Scope);
@@ -139,17 +139,17 @@
 
 /// getOrCreateRegularScope - Find or create a regular lexical scope.
 LexicalScope *
-LexicalScopes::getOrCreateRegularScope(const MDLocalScope *Scope) {
-  if (auto *File = dyn_cast<MDLexicalBlockFile>(Scope))
+LexicalScopes::getOrCreateRegularScope(const DILocalScope *Scope) {
+  if (auto *File = dyn_cast<DILexicalBlockFile>(Scope))
     Scope = File->getScope();
 
   auto I = LexicalScopeMap.find(Scope);
   if (I != LexicalScopeMap.end())
     return &I->second;
 
-  // FIXME: Should the following dyn_cast be MDLexicalBlock?
+  // FIXME: Should the following dyn_cast be DILexicalBlock?
   LexicalScope *Parent = nullptr;
-  if (auto *Block = dyn_cast<MDLexicalBlockBase>(Scope))
+  if (auto *Block = dyn_cast<DILexicalBlockBase>(Scope))
     Parent = getOrCreateLexicalScope(Block->getScope());
   I = LexicalScopeMap.emplace(std::piecewise_construct,
                               std::forward_as_tuple(Scope),
@@ -157,7 +157,7 @@
                                                     false)).first;
 
   if (!Parent) {
-    assert(cast<MDSubprogram>(Scope)->describes(MF->getFunction()));
+    assert(cast<DISubprogram>(Scope)->describes(MF->getFunction()));
     assert(!CurrentFnLexicalScope);
     CurrentFnLexicalScope = &I->second;
   }
@@ -167,15 +167,15 @@
 
 /// getOrCreateInlinedScope - Find or create an inlined lexical scope.
 LexicalScope *
-LexicalScopes::getOrCreateInlinedScope(const MDLocalScope *Scope,
-                                       const MDLocation *InlinedAt) {
-  std::pair<const MDLocalScope *, const MDLocation *> P(Scope, InlinedAt);
+LexicalScopes::getOrCreateInlinedScope(const DILocalScope *Scope,
+                                       const DILocation *InlinedAt) {
+  std::pair<const DILocalScope *, const DILocation *> P(Scope, InlinedAt);
   auto I = InlinedLexicalScopeMap.find(P);
   if (I != InlinedLexicalScopeMap.end())
     return &I->second;
 
   LexicalScope *Parent;
-  if (auto *Block = dyn_cast<MDLexicalBlockBase>(Scope))
+  if (auto *Block = dyn_cast<DILexicalBlockBase>(Scope))
     Parent = getOrCreateInlinedScope(Block->getScope(), InlinedAt);
   else
     Parent = getOrCreateLexicalScope(InlinedAt);
@@ -190,25 +190,25 @@
 
 /// getOrCreateAbstractScope - Find or create an abstract lexical scope.
 LexicalScope *
-LexicalScopes::getOrCreateAbstractScope(const MDLocalScope *Scope) {
+LexicalScopes::getOrCreateAbstractScope(const DILocalScope *Scope) {
   assert(Scope && "Invalid Scope encoding!");
 
-  if (auto *File = dyn_cast<MDLexicalBlockFile>(Scope))
+  if (auto *File = dyn_cast<DILexicalBlockFile>(Scope))
     Scope = File->getScope();
   auto I = AbstractScopeMap.find(Scope);
   if (I != AbstractScopeMap.end())
     return &I->second;
 
-  // FIXME: Should the following isa be MDLexicalBlock?
+  // FIXME: Should the following isa be DILexicalBlock?
   LexicalScope *Parent = nullptr;
-  if (auto *Block = dyn_cast<MDLexicalBlockBase>(Scope))
+  if (auto *Block = dyn_cast<DILexicalBlockBase>(Scope))
     Parent = getOrCreateAbstractScope(Block->getScope());
 
   I = AbstractScopeMap.emplace(std::piecewise_construct,
                                std::forward_as_tuple(Scope),
                                std::forward_as_tuple(Parent, Scope,
                                                      nullptr, true)).first;
-  if (isa<MDSubprogram>(Scope))
+  if (isa<DISubprogram>(Scope))
     AbstractScopesList.push_back(&I->second);
   return &I->second;
 }
@@ -269,7 +269,7 @@
 /// have machine instructions that belong to lexical scope identified by
 /// DebugLoc.
 void LexicalScopes::getMachineBasicBlocks(
-    const MDLocation *DL, SmallPtrSetImpl<const MachineBasicBlock *> &MBBs) {
+    const DILocation *DL, SmallPtrSetImpl<const MachineBasicBlock *> &MBBs) {
   MBBs.clear();
   LexicalScope *Scope = getOrCreateLexicalScope(DL);
   if (!Scope)
@@ -292,7 +292,7 @@
 
 /// dominates - Return true if DebugLoc's lexical scope dominates at least one
 /// machine instruction's lexical scope in a given machine basic block.
-bool LexicalScopes::dominates(const MDLocation *DL, MachineBasicBlock *MBB) {
+bool LexicalScopes::dominates(const DILocation *DL, MachineBasicBlock *MBB) {
   LexicalScope *Scope = getOrCreateLexicalScope(DL);
   if (!Scope)
     return false;
@@ -304,7 +304,7 @@
   bool Result = false;
   for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end(); I != E;
        ++I) {
-    if (const MDLocation *IDL = I->getDebugLoc())
+    if (const DILocation *IDL = I->getDebugLoc())
       if (LexicalScope *IScope = getOrCreateLexicalScope(IDL))
         if (Scope->dominates(IScope))
           return true;
diff --git a/llvm/lib/CodeGen/LiveDebugVariables.cpp b/llvm/lib/CodeGen/LiveDebugVariables.cpp
index df48c53..1571551 100644
--- a/llvm/lib/CodeGen/LiveDebugVariables.cpp
+++ b/llvm/lib/CodeGen/LiveDebugVariables.cpp
@@ -158,7 +158,7 @@
   UserValue *getNext() const { return next; }
 
   /// match - Does this UserValue match the parameters?
-  bool match(const MDNode *Var, const MDNode *Expr, const MDLocation *IA,
+  bool match(const MDNode *Var, const MDNode *Expr, const DILocation *IA,
              unsigned Offset, bool indirect) const {
     return Var == Variable && Expr == Expression && dl->getInlinedAt() == IA &&
            Offset == offset && indirect == IsIndirect;
@@ -362,7 +362,7 @@
   if (!DL)
     return;
 
-  auto *Scope = cast<MDScope>(DL.getScope());
+  auto *Scope = cast<DIScope>(DL.getScope());
   // Omit the directory, because it's likely to be long and uninteresting.
   CommentOS << Scope->getFilename();
   CommentOS << ':' << DL.getLine();
@@ -378,8 +378,8 @@
   CommentOS << " ]";
 }
 
-static void printExtendedName(raw_ostream &OS, const MDLocalVariable *V,
-                              const MDLocation *DL) {
+static void printExtendedName(raw_ostream &OS, const DILocalVariable *V,
+                              const DILocation *DL) {
   const LLVMContext &Ctx = V->getContext();
   StringRef Res = V->getName();
   if (!Res.empty())
@@ -394,7 +394,7 @@
 }
 
 void UserValue::print(raw_ostream &OS, const TargetRegisterInfo *TRI) {
-  auto *DV = cast<MDLocalVariable>(Variable);
+  auto *DV = cast<DILocalVariable>(Variable);
   OS << "!\"";
   printExtendedName(OS, DV, dl);
 
@@ -981,7 +981,7 @@
   MachineOperand &Loc = locations[LocNo];
   ++NumInsertedDebugValues;
 
-  assert(cast<MDLocalVariable>(Variable)
+  assert(cast<DILocalVariable>(Variable)
              ->isValidLocationForIntrinsic(getDebugLoc()) &&
          "Expected inlined-at fields to agree");
   if (Loc.isReg())
diff --git a/llvm/lib/CodeGen/LiveDebugVariables.h b/llvm/lib/CodeGen/LiveDebugVariables.h
index 88a34dd..ac2d1a1 100644
--- a/llvm/lib/CodeGen/LiveDebugVariables.h
+++ b/llvm/lib/CodeGen/LiveDebugVariables.h
@@ -33,7 +33,7 @@
 
 class LiveDebugVariables : public MachineFunctionPass {
   void *pImpl;
-  DenseMap<const Function *, MDSubprogram *> FunctionDIs;
+  DenseMap<const Function *, DISubprogram *> FunctionDIs;
 
 public:
   static char ID; // Pass identification, replacement for typeid
diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp
index 86d33b0..7f3c3e9 100644
--- a/llvm/lib/CodeGen/MachineInstr.cpp
+++ b/llvm/lib/CodeGen/MachineInstr.cpp
@@ -1619,7 +1619,7 @@
     }
     if (isDebugValue() && MO.isMetadata()) {
       // Pretty print DBG_VALUE instructions.
-      auto *DIV = dyn_cast<MDLocalVariable>(MO.getMetadata());
+      auto *DIV = dyn_cast<DILocalVariable>(MO.getMetadata());
       if (DIV && !DIV->getName().empty())
         OS << "!\"" << DIV->getName() << '\"';
       else
@@ -1710,7 +1710,7 @@
   // Print debug location information.
   if (isDebugValue() && getOperand(e - 2).isMetadata()) {
     if (!HaveSemi) OS << ";";
-    auto *DV = cast<MDLocalVariable>(getOperand(e - 2).getMetadata());
+    auto *DV = cast<DILocalVariable>(getOperand(e - 2).getMetadata());
     OS << " line no:" <<  DV->getLine();
     if (auto *InlinedAt = debugLoc->getInlinedAt()) {
       DebugLoc InlinedAtDL(InlinedAt);
diff --git a/llvm/lib/CodeGen/RegAllocFast.cpp b/llvm/lib/CodeGen/RegAllocFast.cpp
index c311c7b..fd3d4d7 100644
--- a/llvm/lib/CodeGen/RegAllocFast.cpp
+++ b/llvm/lib/CodeGen/RegAllocFast.cpp
@@ -302,7 +302,7 @@
       bool IsIndirect = DBG->isIndirectDebugValue();
       uint64_t Offset = IsIndirect ? DBG->getOperand(1).getImm() : 0;
       DebugLoc DL = DBG->getDebugLoc();
-      assert(cast<MDLocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
+      assert(cast<DILocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
              "Expected inlined-at fields to agree");
       MachineInstr *NewDV =
           BuildMI(*MBB, MI, DL, TII->get(TargetOpcode::DBG_VALUE))
@@ -874,7 +874,7 @@
               DebugLoc DL = MI->getDebugLoc();
               MachineBasicBlock *MBB = MI->getParent();
               assert(
-                  cast<MDLocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
+                  cast<DILocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
                   "Expected inlined-at fields to agree");
               MachineInstr *NewDV = BuildMI(*MBB, MBB->erase(MI), DL,
                                             TII->get(TargetOpcode::DBG_VALUE))
diff --git a/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index ff81fd1..7abc0c4 100644
--- a/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -650,7 +650,7 @@
   MDNode *Var = SD->getVariable();
   MDNode *Expr = SD->getExpression();
   DebugLoc DL = SD->getDebugLoc();
-  assert(cast<MDLocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
+  assert(cast<DILocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
          "Expected inlined-at fields to agree");
 
   if (SD->getKind() == SDDbgValue::FRAMEIX) {
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 8441696..d289406 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -5978,7 +5978,7 @@
 SDDbgValue *SelectionDAG::getDbgValue(MDNode *Var, MDNode *Expr, SDNode *N,
                                       unsigned R, bool IsIndirect, uint64_t Off,
                                       DebugLoc DL, unsigned O) {
-  assert(cast<MDLocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
+  assert(cast<DILocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
          "Expected inlined-at fields to agree");
   return new (Allocator) SDDbgValue(Var, Expr, N, R, IsIndirect, Off, DL, O);
 }
@@ -5987,7 +5987,7 @@
 SDDbgValue *SelectionDAG::getConstantDbgValue(MDNode *Var, MDNode *Expr,
                                               const Value *C, uint64_t Off,
                                               DebugLoc DL, unsigned O) {
-  assert(cast<MDLocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
+  assert(cast<DILocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
          "Expected inlined-at fields to agree");
   return new (Allocator) SDDbgValue(Var, Expr, C, Off, DL, O);
 }
@@ -5996,7 +5996,7 @@
 SDDbgValue *SelectionDAG::getFrameIndexDbgValue(MDNode *Var, MDNode *Expr,
                                                 unsigned FI, uint64_t Off,
                                                 DebugLoc DL, unsigned O) {
-  assert(cast<MDLocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
+  assert(cast<DILocalVariable>(Var)->isValidLocationForIntrinsic(DL) &&
          "Expected inlined-at fields to agree");
   return new (Allocator) SDDbgValue(Var, Expr, FI, Off, DL, O);
 }
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 08bdccd..db41c40 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -999,8 +999,8 @@
     const DbgValueInst *DI = DDI.getDI();
     DebugLoc dl = DDI.getdl();
     unsigned DbgSDNodeOrder = DDI.getSDNodeOrder();
-    MDLocalVariable *Variable = DI->getVariable();
-    MDExpression *Expr = DI->getExpression();
+    DILocalVariable *Variable = DI->getVariable();
+    DIExpression *Expr = DI->getExpression();
     assert(Variable->isValidLocationForIntrinsic(dl) &&
            "Expected inlined-at fields to agree");
     uint64_t Offset = DI->getOffset();
@@ -3980,8 +3980,8 @@
 /// argument, create the corresponding DBG_VALUE machine instruction for it now.
 /// At the end of instruction selection, they will be inserted to the entry BB.
 bool SelectionDAGBuilder::EmitFuncArgumentDbgValue(
-    const Value *V, MDLocalVariable *Variable, MDExpression *Expr,
-    MDLocation *DL, int64_t Offset, bool IsIndirect, const SDValue &N) {
+    const Value *V, DILocalVariable *Variable, DIExpression *Expr,
+    DILocation *DL, int64_t Offset, bool IsIndirect, const SDValue &N) {
   const Argument *Arg = dyn_cast<Argument>(V);
   if (!Arg)
     return false;
@@ -4175,8 +4175,8 @@
   }
   case Intrinsic::dbg_declare: {
     const DbgDeclareInst &DI = cast<DbgDeclareInst>(I);
-    MDLocalVariable *Variable = DI.getVariable();
-    MDExpression *Expression = DI.getExpression();
+    DILocalVariable *Variable = DI.getVariable();
+    DIExpression *Expression = DI.getExpression();
     const Value *Address = DI.getAddress();
     assert(Variable && "Missing variable");
     if (!Address) {
@@ -4257,8 +4257,8 @@
     const DbgValueInst &DI = cast<DbgValueInst>(I);
     assert(DI.getVariable() && "Missing variable");
 
-    MDLocalVariable *Variable = DI.getVariable();
-    MDExpression *Expression = DI.getExpression();
+    DILocalVariable *Variable = DI.getVariable();
+    DIExpression *Expression = DI.getExpression();
     uint64_t Offset = DI.getOffset();
     const Value *V = DI.getValue();
     if (!V)
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
index 3e232e7..f812507 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -866,8 +866,8 @@
   /// EmitFuncArgumentDbgValue - If V is an function argument then create
   /// corresponding DBG_VALUE machine instruction for it now. At the end of
   /// instruction selection, they will be inserted to the entry BB.
-  bool EmitFuncArgumentDbgValue(const Value *V, MDLocalVariable *Variable,
-                                MDExpression *Expr, MDLocation *DL,
+  bool EmitFuncArgumentDbgValue(const Value *V, DILocalVariable *Variable,
+                                DIExpression *Expr, DILocation *DL,
                                 int64_t Offset, bool IsIndirect,
                                 const SDValue &N);
 
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
index 636c0a7..b728833 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
@@ -523,7 +523,7 @@
   if (!G)
     return;
 
-  MDLocation *L = getDebugLoc();
+  DILocation *L = getDebugLoc();
   if (!L)
     return;
 
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 7213a5b..e208076 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -504,7 +504,7 @@
       DebugLoc DL = MI->getDebugLoc();
       bool IsIndirect = MI->isIndirectDebugValue();
       unsigned Offset = IsIndirect ? MI->getOperand(1).getImm() : 0;
-      assert(cast<MDLocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
+      assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&
              "Expected inlined-at fields to agree");
       // Def is never a terminator here, so it is ok to increment InsertPos.
       BuildMI(*EntryMBB, ++InsertPos, DL, TII->get(TargetOpcode::DBG_VALUE),
diff --git a/llvm/lib/CodeGen/StackColoring.cpp b/llvm/lib/CodeGen/StackColoring.cpp
index 2bf2d64..f9a2072 100644
--- a/llvm/lib/CodeGen/StackColoring.cpp
+++ b/llvm/lib/CodeGen/StackColoring.cpp
@@ -464,7 +464,7 @@
       continue;
     if (SlotRemap.count(VI.Slot)) {
       DEBUG(dbgs() << "Remapping debug info for ["
-                   << cast<MDLocalVariable>(VI.Var)->getName() << "].\n");
+                   << cast<DILocalVariable>(VI.Var)->getName() << "].\n");
       VI.Slot = SlotRemap[VI.Slot];
       FixedDbg++;
     }
diff --git a/llvm/lib/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp
index 0564513..6dfb7fa 100644
--- a/llvm/lib/IR/AsmWriter.cpp
+++ b/llvm/lib/IR/AsmWriter.cpp
@@ -1375,7 +1375,7 @@
                  SlotTracker *Machine, const Module *Context)
       : Out(Out), TypePrinter(TypePrinter), Machine(Machine), Context(Context) {
   }
-  void printTag(const DebugNode *N);
+  void printTag(const DINode *N);
   void printString(StringRef Name, StringRef Value,
                    bool ShouldSkipEmpty = true);
   void printMetadata(StringRef Name, const Metadata *MD,
@@ -1390,7 +1390,7 @@
 };
 } // end namespace
 
-void MDFieldPrinter::printTag(const DebugNode *N) {
+void MDFieldPrinter::printTag(const DINode *N) {
   Out << FS << "tag: ";
   if (const char *Tag = dwarf::TagString(N->getTag()))
     Out << Tag;
@@ -1447,11 +1447,11 @@
   Out << FS << Name << ": ";
 
   SmallVector<unsigned, 8> SplitFlags;
-  unsigned Extra = DebugNode::splitFlags(Flags, SplitFlags);
+  unsigned Extra = DINode::splitFlags(Flags, SplitFlags);
 
   FieldSeparator FlagsFS(" | ");
   for (unsigned F : SplitFlags) {
-    const char *StringF = DebugNode::getFlagString(F);
+    const char *StringF = DINode::getFlagString(F);
     assert(StringF && "Expected valid flag");
     Out << FlagsFS << StringF;
   }
@@ -1472,10 +1472,10 @@
     Out << Value;
 }
 
-static void writeGenericDebugNode(raw_ostream &Out, const GenericDebugNode *N,
-                                  TypePrinting *TypePrinter,
-                                  SlotTracker *Machine, const Module *Context) {
-  Out << "!GenericDebugNode(";
+static void writeGenericDINode(raw_ostream &Out, const GenericDINode *N,
+                               TypePrinting *TypePrinter, SlotTracker *Machine,
+                               const Module *Context) {
+  Out << "!GenericDINode(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printTag(N);
   Printer.printString("header", N->getHeader());
@@ -1491,10 +1491,10 @@
   Out << ")";
 }
 
-static void writeMDLocation(raw_ostream &Out, const MDLocation *DL,
+static void writeDILocation(raw_ostream &Out, const DILocation *DL,
                             TypePrinting *TypePrinter, SlotTracker *Machine,
                             const Module *Context) {
-  Out << "!MDLocation(";
+  Out << "!DILocation(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   // Always output the line, since 0 is a relevant and important value for it.
   Printer.printInt("line", DL->getLine(), /* ShouldSkipZero */ false);
@@ -1504,27 +1504,27 @@
   Out << ")";
 }
 
-static void writeMDSubrange(raw_ostream &Out, const MDSubrange *N,
+static void writeDISubrange(raw_ostream &Out, const DISubrange *N,
                             TypePrinting *, SlotTracker *, const Module *) {
-  Out << "!MDSubrange(";
+  Out << "!DISubrange(";
   MDFieldPrinter Printer(Out);
   Printer.printInt("count", N->getCount(), /* ShouldSkipZero */ false);
   Printer.printInt("lowerBound", N->getLowerBound());
   Out << ")";
 }
 
-static void writeMDEnumerator(raw_ostream &Out, const MDEnumerator *N,
+static void writeDIEnumerator(raw_ostream &Out, const DIEnumerator *N,
                               TypePrinting *, SlotTracker *, const Module *) {
-  Out << "!MDEnumerator(";
+  Out << "!DIEnumerator(";
   MDFieldPrinter Printer(Out);
   Printer.printString("name", N->getName(), /* ShouldSkipEmpty */ false);
   Printer.printInt("value", N->getValue(), /* ShouldSkipZero */ false);
   Out << ")";
 }
 
-static void writeMDBasicType(raw_ostream &Out, const MDBasicType *N,
+static void writeDIBasicType(raw_ostream &Out, const DIBasicType *N,
                              TypePrinting *, SlotTracker *, const Module *) {
-  Out << "!MDBasicType(";
+  Out << "!DIBasicType(";
   MDFieldPrinter Printer(Out);
   if (N->getTag() != dwarf::DW_TAG_base_type)
     Printer.printTag(N);
@@ -1536,10 +1536,10 @@
   Out << ")";
 }
 
-static void writeMDDerivedType(raw_ostream &Out, const MDDerivedType *N,
+static void writeDIDerivedType(raw_ostream &Out, const DIDerivedType *N,
                                TypePrinting *TypePrinter, SlotTracker *Machine,
                                const Module *Context) {
-  Out << "!MDDerivedType(";
+  Out << "!DIDerivedType(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printTag(N);
   Printer.printString("name", N->getName());
@@ -1556,10 +1556,10 @@
   Out << ")";
 }
 
-static void writeMDCompositeType(raw_ostream &Out, const MDCompositeType *N,
+static void writeDICompositeType(raw_ostream &Out, const DICompositeType *N,
                                  TypePrinting *TypePrinter,
                                  SlotTracker *Machine, const Module *Context) {
-  Out << "!MDCompositeType(";
+  Out << "!DICompositeType(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printTag(N);
   Printer.printString("name", N->getName());
@@ -1580,10 +1580,10 @@
   Out << ")";
 }
 
-static void writeMDSubroutineType(raw_ostream &Out, const MDSubroutineType *N,
+static void writeDISubroutineType(raw_ostream &Out, const DISubroutineType *N,
                                   TypePrinting *TypePrinter,
                                   SlotTracker *Machine, const Module *Context) {
-  Out << "!MDSubroutineType(";
+  Out << "!DISubroutineType(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printDIFlags("flags", N->getFlags());
   Printer.printMetadata("types", N->getRawTypeArray(),
@@ -1591,9 +1591,9 @@
   Out << ")";
 }
 
-static void writeMDFile(raw_ostream &Out, const MDFile *N, TypePrinting *,
+static void writeDIFile(raw_ostream &Out, const DIFile *N, TypePrinting *,
                         SlotTracker *, const Module *) {
-  Out << "!MDFile(";
+  Out << "!DIFile(";
   MDFieldPrinter Printer(Out);
   Printer.printString("filename", N->getFilename(),
                       /* ShouldSkipEmpty */ false);
@@ -1602,10 +1602,10 @@
   Out << ")";
 }
 
-static void writeMDCompileUnit(raw_ostream &Out, const MDCompileUnit *N,
+static void writeDICompileUnit(raw_ostream &Out, const DICompileUnit *N,
                                TypePrinting *TypePrinter, SlotTracker *Machine,
                                const Module *Context) {
-  Out << "!MDCompileUnit(";
+  Out << "!DICompileUnit(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printDwarfEnum("language", N->getSourceLanguage(),
                          dwarf::LanguageString, /* ShouldSkipZero */ false);
@@ -1626,10 +1626,10 @@
   Out << ")";
 }
 
-static void writeMDSubprogram(raw_ostream &Out, const MDSubprogram *N,
+static void writeDISubprogram(raw_ostream &Out, const DISubprogram *N,
                               TypePrinting *TypePrinter, SlotTracker *Machine,
                               const Module *Context) {
-  Out << "!MDSubprogram(";
+  Out << "!DISubprogram(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printString("name", N->getName());
   Printer.printString("linkageName", N->getLinkageName());
@@ -1653,10 +1653,10 @@
   Out << ")";
 }
 
-static void writeMDLexicalBlock(raw_ostream &Out, const MDLexicalBlock *N,
-                              TypePrinting *TypePrinter, SlotTracker *Machine,
-                              const Module *Context) {
-  Out << "!MDLexicalBlock(";
+static void writeDILexicalBlock(raw_ostream &Out, const DILexicalBlock *N,
+                                TypePrinting *TypePrinter, SlotTracker *Machine,
+                                const Module *Context) {
+  Out << "!DILexicalBlock(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printMetadata("scope", N->getRawScope(), /* ShouldSkipNull */ false);
   Printer.printMetadata("file", N->getRawFile());
@@ -1665,12 +1665,12 @@
   Out << ")";
 }
 
-static void writeMDLexicalBlockFile(raw_ostream &Out,
-                                    const MDLexicalBlockFile *N,
+static void writeDILexicalBlockFile(raw_ostream &Out,
+                                    const DILexicalBlockFile *N,
                                     TypePrinting *TypePrinter,
                                     SlotTracker *Machine,
                                     const Module *Context) {
-  Out << "!MDLexicalBlockFile(";
+  Out << "!DILexicalBlockFile(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printMetadata("scope", N->getRawScope(), /* ShouldSkipNull */ false);
   Printer.printMetadata("file", N->getRawFile());
@@ -1679,10 +1679,10 @@
   Out << ")";
 }
 
-static void writeMDNamespace(raw_ostream &Out, const MDNamespace *N,
+static void writeDINamespace(raw_ostream &Out, const DINamespace *N,
                              TypePrinting *TypePrinter, SlotTracker *Machine,
                              const Module *Context) {
-  Out << "!MDNamespace(";
+  Out << "!DINamespace(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printString("name", N->getName());
   Printer.printMetadata("scope", N->getRawScope(), /* ShouldSkipNull */ false);
@@ -1691,24 +1691,24 @@
   Out << ")";
 }
 
-static void writeMDTemplateTypeParameter(raw_ostream &Out,
-                                         const MDTemplateTypeParameter *N,
+static void writeDITemplateTypeParameter(raw_ostream &Out,
+                                         const DITemplateTypeParameter *N,
                                          TypePrinting *TypePrinter,
                                          SlotTracker *Machine,
                                          const Module *Context) {
-  Out << "!MDTemplateTypeParameter(";
+  Out << "!DITemplateTypeParameter(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printString("name", N->getName());
   Printer.printMetadata("type", N->getRawType(), /* ShouldSkipNull */ false);
   Out << ")";
 }
 
-static void writeMDTemplateValueParameter(raw_ostream &Out,
-                                          const MDTemplateValueParameter *N,
+static void writeDITemplateValueParameter(raw_ostream &Out,
+                                          const DITemplateValueParameter *N,
                                           TypePrinting *TypePrinter,
                                           SlotTracker *Machine,
                                           const Module *Context) {
-  Out << "!MDTemplateValueParameter(";
+  Out << "!DITemplateValueParameter(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   if (N->getTag() != dwarf::DW_TAG_template_value_parameter)
     Printer.printTag(N);
@@ -1718,10 +1718,10 @@
   Out << ")";
 }
 
-static void writeMDGlobalVariable(raw_ostream &Out, const MDGlobalVariable *N,
+static void writeDIGlobalVariable(raw_ostream &Out, const DIGlobalVariable *N,
                                   TypePrinting *TypePrinter,
                                   SlotTracker *Machine, const Module *Context) {
-  Out << "!MDGlobalVariable(";
+  Out << "!DIGlobalVariable(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printString("name", N->getName());
   Printer.printString("linkageName", N->getLinkageName());
@@ -1736,10 +1736,10 @@
   Out << ")";
 }
 
-static void writeMDLocalVariable(raw_ostream &Out, const MDLocalVariable *N,
+static void writeDILocalVariable(raw_ostream &Out, const DILocalVariable *N,
                                  TypePrinting *TypePrinter,
                                  SlotTracker *Machine, const Module *Context) {
-  Out << "!MDLocalVariable(";
+  Out << "!DILocalVariable(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printTag(N);
   Printer.printString("name", N->getName());
@@ -1754,10 +1754,10 @@
   Out << ")";
 }
 
-static void writeMDExpression(raw_ostream &Out, const MDExpression *N,
+static void writeDIExpression(raw_ostream &Out, const DIExpression *N,
                               TypePrinting *TypePrinter, SlotTracker *Machine,
                               const Module *Context) {
-  Out << "!MDExpression(";
+  Out << "!DIExpression(";
   FieldSeparator FS;
   if (N->isValid()) {
     for (auto I = N->expr_op_begin(), E = N->expr_op_end(); I != E; ++I) {
@@ -1775,10 +1775,10 @@
   Out << ")";
 }
 
-static void writeMDObjCProperty(raw_ostream &Out, const MDObjCProperty *N,
+static void writeDIObjCProperty(raw_ostream &Out, const DIObjCProperty *N,
                                 TypePrinting *TypePrinter, SlotTracker *Machine,
                                 const Module *Context) {
-  Out << "!MDObjCProperty(";
+  Out << "!DIObjCProperty(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printString("name", N->getName());
   Printer.printMetadata("file", N->getRawFile());
@@ -1790,10 +1790,10 @@
   Out << ")";
 }
 
-static void writeMDImportedEntity(raw_ostream &Out, const MDImportedEntity *N,
+static void writeDIImportedEntity(raw_ostream &Out, const DIImportedEntity *N,
                                   TypePrinting *TypePrinter,
                                   SlotTracker *Machine, const Module *Context) {
-  Out << "!MDImportedEntity(";
+  Out << "!DIImportedEntity(";
   MDFieldPrinter Printer(Out, TypePrinter, Machine, Context);
   Printer.printTag(N);
   Printer.printString("name", N->getName());
diff --git a/llvm/lib/IR/DIBuilder.cpp b/llvm/lib/IR/DIBuilder.cpp
index c849f10..3baa468 100644
--- a/llvm/lib/IR/DIBuilder.cpp
+++ b/llvm/lib/IR/DIBuilder.cpp
@@ -87,13 +87,13 @@
       RetainValues.push_back(AllRetainTypes[I]);
   TempRetainTypes->replaceAllUsesWith(MDTuple::get(VMContext, RetainValues));
 
-  MDSubprogramArray SPs = MDTuple::get(VMContext, AllSubprograms);
+  DISubprogramArray SPs = MDTuple::get(VMContext, AllSubprograms);
   TempSubprograms->replaceAllUsesWith(SPs.get());
   for (auto *SP : SPs) {
     if (MDTuple *Temp = SP->getVariables().get()) {
       const auto &PV = PreservedVariables.lookup(SP);
       SmallVector<Metadata *, 4> Variables(PV.begin(), PV.end());
-      DebugNodeArray AV = getOrCreateArray(Variables);
+      DINodeArray AV = getOrCreateArray(Variables);
       TempMDTuple(Temp)->replaceAllUsesWith(AV.get());
     }
   }
@@ -116,13 +116,13 @@
 }
 
 /// If N is compile unit return NULL otherwise return N.
-static MDScope *getNonCompileUnitScope(MDScope *N) {
-  if (!N || isa<MDCompileUnit>(N))
+static DIScope *getNonCompileUnitScope(DIScope *N) {
+  if (!N || isa<DICompileUnit>(N))
     return nullptr;
-  return cast<MDScope>(N);
+  return cast<DIScope>(N);
 }
 
-MDCompileUnit *DIBuilder::createCompileUnit(
+DICompileUnit *DIBuilder::createCompileUnit(
     unsigned Lang, StringRef Filename, StringRef Directory, StringRef Producer,
     bool isOptimized, StringRef Flags, unsigned RunTimeVer, StringRef SplitName,
     DebugEmissionKind Kind, bool EmitDebugInfo) {
@@ -133,7 +133,7 @@
   assert(!Filename.empty() &&
          "Unable to create compile unit without filename");
 
-  // TODO: Once we make MDCompileUnit distinct, stop using temporaries here
+  // TODO: Once we make DICompileUnit distinct, stop using temporaries here
   // (just start with operands assigned to nullptr).
   TempEnumTypes = MDTuple::getTemporary(VMContext, None);
   TempRetainTypes = MDTuple::getTemporary(VMContext, None);
@@ -143,8 +143,8 @@
 
   // TODO: Switch to getDistinct().  We never want to merge compile units based
   // on contents.
-  MDCompileUnit *CUNode = MDCompileUnit::get(
-      VMContext, Lang, MDFile::get(VMContext, Filename, Directory), Producer,
+  DICompileUnit *CUNode = DICompileUnit::get(
+      VMContext, Lang, DIFile::get(VMContext, Filename, Directory), Producer,
       isOptimized, Flags, RunTimeVer, SplitName, Kind, TempEnumTypes.get(),
       TempRetainTypes.get(), TempSubprograms.get(), TempGVs.get(),
       TempImportedModules.get());
@@ -163,132 +163,132 @@
   return CUNode;
 }
 
-static MDImportedEntity*
-createImportedModule(LLVMContext &C, dwarf::Tag Tag, MDScope* Context,
+static DIImportedEntity *
+createImportedModule(LLVMContext &C, dwarf::Tag Tag, DIScope *Context,
                      Metadata *NS, unsigned Line, StringRef Name,
                      SmallVectorImpl<TrackingMDNodeRef> &AllImportedModules) {
-  auto *M =
-      MDImportedEntity::get(C, Tag, Context, DebugNodeRef(NS), Line, Name);
+  auto *M = DIImportedEntity::get(C, Tag, Context, DINodeRef(NS), Line, Name);
   AllImportedModules.emplace_back(M);
   return M;
 }
 
-MDImportedEntity* DIBuilder::createImportedModule(MDScope* Context,
-                                                 MDNamespace* NS,
-                                                 unsigned Line) {
+DIImportedEntity *DIBuilder::createImportedModule(DIScope *Context,
+                                                  DINamespace *NS,
+                                                  unsigned Line) {
   return ::createImportedModule(VMContext, dwarf::DW_TAG_imported_module,
                                 Context, NS, Line, StringRef(), AllImportedModules);
 }
 
-MDImportedEntity* DIBuilder::createImportedModule(MDScope* Context,
-                                                 MDImportedEntity* NS,
-                                                 unsigned Line) {
+DIImportedEntity *DIBuilder::createImportedModule(DIScope *Context,
+                                                  DIImportedEntity *NS,
+                                                  unsigned Line) {
   return ::createImportedModule(VMContext, dwarf::DW_TAG_imported_module,
                                 Context, NS, Line, StringRef(), AllImportedModules);
 }
 
-MDImportedEntity *DIBuilder::createImportedDeclaration(MDScope *Context,
-                                                       DebugNode *Decl,
+DIImportedEntity *DIBuilder::createImportedDeclaration(DIScope *Context,
+                                                       DINode *Decl,
                                                        unsigned Line,
                                                        StringRef Name) {
   // Make sure to use the unique identifier based metadata reference for
   // types that have one.
   return ::createImportedModule(VMContext, dwarf::DW_TAG_imported_declaration,
-                                Context, DebugNodeRef::get(Decl), Line, Name,
+                                Context, DINodeRef::get(Decl), Line, Name,
                                 AllImportedModules);
 }
 
-MDFile* DIBuilder::createFile(StringRef Filename, StringRef Directory) {
-  return MDFile::get(VMContext, Filename, Directory);
+DIFile *DIBuilder::createFile(StringRef Filename, StringRef Directory) {
+  return DIFile::get(VMContext, Filename, Directory);
 }
 
-MDEnumerator *DIBuilder::createEnumerator(StringRef Name, int64_t Val) {
+DIEnumerator *DIBuilder::createEnumerator(StringRef Name, int64_t Val) {
   assert(!Name.empty() && "Unable to create enumerator without name");
-  return MDEnumerator::get(VMContext, Val, Name);
+  return DIEnumerator::get(VMContext, Val, Name);
 }
 
-MDBasicType *DIBuilder::createUnspecifiedType(StringRef Name) {
+DIBasicType *DIBuilder::createUnspecifiedType(StringRef Name) {
   assert(!Name.empty() && "Unable to create type without name");
-  return MDBasicType::get(VMContext, dwarf::DW_TAG_unspecified_type, Name);
+  return DIBasicType::get(VMContext, dwarf::DW_TAG_unspecified_type, Name);
 }
 
-MDBasicType *DIBuilder::createNullPtrType() {
+DIBasicType *DIBuilder::createNullPtrType() {
   return createUnspecifiedType("decltype(nullptr)");
 }
 
-MDBasicType *DIBuilder::createBasicType(StringRef Name, uint64_t SizeInBits,
+DIBasicType *DIBuilder::createBasicType(StringRef Name, uint64_t SizeInBits,
                                         uint64_t AlignInBits,
                                         unsigned Encoding) {
   assert(!Name.empty() && "Unable to create type without name");
-  return MDBasicType::get(VMContext, dwarf::DW_TAG_base_type, Name, SizeInBits,
+  return DIBasicType::get(VMContext, dwarf::DW_TAG_base_type, Name, SizeInBits,
                           AlignInBits, Encoding);
 }
 
-MDDerivedType *DIBuilder::createQualifiedType(unsigned Tag, MDType *FromTy) {
-  return MDDerivedType::get(VMContext, Tag, "", nullptr, 0, nullptr,
-                            MDTypeRef::get(FromTy), 0, 0, 0, 0);
+DIDerivedType *DIBuilder::createQualifiedType(unsigned Tag, DIType *FromTy) {
+  return DIDerivedType::get(VMContext, Tag, "", nullptr, 0, nullptr,
+                            DITypeRef::get(FromTy), 0, 0, 0, 0);
 }
 
-MDDerivedType *DIBuilder::createPointerType(MDType *PointeeTy,
+DIDerivedType *DIBuilder::createPointerType(DIType *PointeeTy,
                                             uint64_t SizeInBits,
                                             uint64_t AlignInBits,
                                             StringRef Name) {
   // FIXME: Why is there a name here?
-  return MDDerivedType::get(VMContext, dwarf::DW_TAG_pointer_type, Name,
-                            nullptr, 0, nullptr, MDTypeRef::get(PointeeTy),
+  return DIDerivedType::get(VMContext, dwarf::DW_TAG_pointer_type, Name,
+                            nullptr, 0, nullptr, DITypeRef::get(PointeeTy),
                             SizeInBits, AlignInBits, 0, 0);
 }
 
-MDDerivedType *DIBuilder::createMemberPointerType(MDType *PointeeTy,
-                                                  MDType *Base,
+DIDerivedType *DIBuilder::createMemberPointerType(DIType *PointeeTy,
+                                                  DIType *Base,
                                                   uint64_t SizeInBits,
                                                   uint64_t AlignInBits) {
-  return MDDerivedType::get(VMContext, dwarf::DW_TAG_ptr_to_member_type, "",
-                            nullptr, 0, nullptr, MDTypeRef::get(PointeeTy),
-                            SizeInBits, AlignInBits, 0, 0, MDTypeRef::get(Base));
+  return DIDerivedType::get(VMContext, dwarf::DW_TAG_ptr_to_member_type, "",
+                            nullptr, 0, nullptr, DITypeRef::get(PointeeTy),
+                            SizeInBits, AlignInBits, 0, 0,
+                            DITypeRef::get(Base));
 }
 
-MDDerivedType *DIBuilder::createReferenceType(unsigned Tag, MDType *RTy) {
+DIDerivedType *DIBuilder::createReferenceType(unsigned Tag, DIType *RTy) {
   assert(RTy && "Unable to create reference type");
-  return MDDerivedType::get(VMContext, Tag, "", nullptr, 0, nullptr,
-                            MDTypeRef::get(RTy), 0, 0, 0, 0);
+  return DIDerivedType::get(VMContext, Tag, "", nullptr, 0, nullptr,
+                            DITypeRef::get(RTy), 0, 0, 0, 0);
 }
 
-MDDerivedType *DIBuilder::createTypedef(MDType *Ty, StringRef Name,
-                                        MDFile *File, unsigned LineNo,
-                                        MDScope *Context) {
-  return MDDerivedType::get(VMContext, dwarf::DW_TAG_typedef, Name, File,
+DIDerivedType *DIBuilder::createTypedef(DIType *Ty, StringRef Name,
+                                        DIFile *File, unsigned LineNo,
+                                        DIScope *Context) {
+  return DIDerivedType::get(VMContext, dwarf::DW_TAG_typedef, Name, File,
                             LineNo,
-                            MDScopeRef::get(getNonCompileUnitScope(Context)),
-                            MDTypeRef::get(Ty), 0, 0, 0, 0);
+                            DIScopeRef::get(getNonCompileUnitScope(Context)),
+                            DITypeRef::get(Ty), 0, 0, 0, 0);
 }
 
-MDDerivedType *DIBuilder::createFriend(MDType *Ty, MDType *FriendTy) {
+DIDerivedType *DIBuilder::createFriend(DIType *Ty, DIType *FriendTy) {
   assert(Ty && "Invalid type!");
   assert(FriendTy && "Invalid friend type!");
-  return MDDerivedType::get(VMContext, dwarf::DW_TAG_friend, "", nullptr, 0,
-                            MDTypeRef::get(Ty), MDTypeRef::get(FriendTy), 0, 0,
+  return DIDerivedType::get(VMContext, dwarf::DW_TAG_friend, "", nullptr, 0,
+                            DITypeRef::get(Ty), DITypeRef::get(FriendTy), 0, 0,
                             0, 0);
 }
 
-MDDerivedType *DIBuilder::createInheritance(MDType *Ty, MDType *BaseTy,
+DIDerivedType *DIBuilder::createInheritance(DIType *Ty, DIType *BaseTy,
                                             uint64_t BaseOffset,
                                             unsigned Flags) {
   assert(Ty && "Unable to create inheritance");
-  return MDDerivedType::get(VMContext, dwarf::DW_TAG_inheritance, "", nullptr,
-                            0, MDTypeRef::get(Ty), MDTypeRef::get(BaseTy), 0, 0,
+  return DIDerivedType::get(VMContext, dwarf::DW_TAG_inheritance, "", nullptr,
+                            0, DITypeRef::get(Ty), DITypeRef::get(BaseTy), 0, 0,
                             BaseOffset, Flags);
 }
 
-MDDerivedType *DIBuilder::createMemberType(MDScope *Scope, StringRef Name,
-                                           MDFile *File, unsigned LineNumber,
+DIDerivedType *DIBuilder::createMemberType(DIScope *Scope, StringRef Name,
+                                           DIFile *File, unsigned LineNumber,
                                            uint64_t SizeInBits,
                                            uint64_t AlignInBits,
                                            uint64_t OffsetInBits,
-                                           unsigned Flags, MDType *Ty) {
-  return MDDerivedType::get(
+                                           unsigned Flags, DIType *Ty) {
+  return DIDerivedType::get(
       VMContext, dwarf::DW_TAG_member, Name, File, LineNumber,
-      MDScopeRef::get(getNonCompileUnitScope(Scope)), MDTypeRef::get(Ty),
+      DIScopeRef::get(getNonCompileUnitScope(Scope)), DITypeRef::get(Ty),
       SizeInBits, AlignInBits, OffsetInBits, Flags);
 }
 
@@ -298,91 +298,91 @@
   return nullptr;
 }
 
-MDDerivedType *DIBuilder::createStaticMemberType(MDScope *Scope, StringRef Name,
-                                                 MDFile *File,
+DIDerivedType *DIBuilder::createStaticMemberType(DIScope *Scope, StringRef Name,
+                                                 DIFile *File,
                                                  unsigned LineNumber,
-                                                 MDType *Ty, unsigned Flags,
+                                                 DIType *Ty, unsigned Flags,
                                                  llvm::Constant *Val) {
-  Flags |= DebugNode::FlagStaticMember;
-  return MDDerivedType::get(
+  Flags |= DINode::FlagStaticMember;
+  return DIDerivedType::get(
       VMContext, dwarf::DW_TAG_member, Name, File, LineNumber,
-      MDScopeRef::get(getNonCompileUnitScope(Scope)), MDTypeRef::get(Ty), 0, 0,
+      DIScopeRef::get(getNonCompileUnitScope(Scope)), DITypeRef::get(Ty), 0, 0,
       0, Flags, getConstantOrNull(Val));
 }
 
-MDDerivedType *DIBuilder::createObjCIVar(StringRef Name, MDFile *File,
+DIDerivedType *DIBuilder::createObjCIVar(StringRef Name, DIFile *File,
                                          unsigned LineNumber,
                                          uint64_t SizeInBits,
                                          uint64_t AlignInBits,
                                          uint64_t OffsetInBits, unsigned Flags,
-                                         MDType *Ty, MDNode *PropertyNode) {
-  return MDDerivedType::get(
+                                         DIType *Ty, MDNode *PropertyNode) {
+  return DIDerivedType::get(
       VMContext, dwarf::DW_TAG_member, Name, File, LineNumber,
-      MDScopeRef::get(getNonCompileUnitScope(File)), MDTypeRef::get(Ty),
+      DIScopeRef::get(getNonCompileUnitScope(File)), DITypeRef::get(Ty),
       SizeInBits, AlignInBits, OffsetInBits, Flags, PropertyNode);
 }
 
-MDObjCProperty *
-DIBuilder::createObjCProperty(StringRef Name, MDFile *File, unsigned LineNumber,
+DIObjCProperty *
+DIBuilder::createObjCProperty(StringRef Name, DIFile *File, unsigned LineNumber,
                               StringRef GetterName, StringRef SetterName,
-                              unsigned PropertyAttributes, MDType *Ty) {
-  return MDObjCProperty::get(VMContext, Name, File, LineNumber, GetterName,
+                              unsigned PropertyAttributes, DIType *Ty) {
+  return DIObjCProperty::get(VMContext, Name, File, LineNumber, GetterName,
                              SetterName, PropertyAttributes, Ty);
 }
 
-MDTemplateTypeParameter *
-DIBuilder::createTemplateTypeParameter(MDScope *Context, StringRef Name,
-                                       MDType *Ty) {
-  assert((!Context || isa<MDCompileUnit>(Context)) && "Expected compile unit");
-  return MDTemplateTypeParameter::get(VMContext, Name, MDTypeRef::get(Ty));
+DITemplateTypeParameter *
+DIBuilder::createTemplateTypeParameter(DIScope *Context, StringRef Name,
+                                       DIType *Ty) {
+  assert((!Context || isa<DICompileUnit>(Context)) && "Expected compile unit");
+  return DITemplateTypeParameter::get(VMContext, Name, DITypeRef::get(Ty));
 }
 
-static MDTemplateValueParameter *
+static DITemplateValueParameter *
 createTemplateValueParameterHelper(LLVMContext &VMContext, unsigned Tag,
-                                   MDScope *Context, StringRef Name, MDType *Ty,
+                                   DIScope *Context, StringRef Name, DIType *Ty,
                                    Metadata *MD) {
-  assert((!Context || isa<MDCompileUnit>(Context)) && "Expected compile unit");
-  return MDTemplateValueParameter::get(VMContext, Tag, Name, MDTypeRef::get(Ty),
+  assert((!Context || isa<DICompileUnit>(Context)) && "Expected compile unit");
+  return DITemplateValueParameter::get(VMContext, Tag, Name, DITypeRef::get(Ty),
                                        MD);
 }
 
-MDTemplateValueParameter *
-DIBuilder::createTemplateValueParameter(MDScope *Context, StringRef Name,
-                                        MDType *Ty, Constant *Val) {
+DITemplateValueParameter *
+DIBuilder::createTemplateValueParameter(DIScope *Context, StringRef Name,
+                                        DIType *Ty, Constant *Val) {
   return createTemplateValueParameterHelper(
       VMContext, dwarf::DW_TAG_template_value_parameter, Context, Name, Ty,
       getConstantOrNull(Val));
 }
 
-MDTemplateValueParameter *
-DIBuilder::createTemplateTemplateParameter(MDScope *Context, StringRef Name,
-                                           MDType *Ty, StringRef Val) {
+DITemplateValueParameter *
+DIBuilder::createTemplateTemplateParameter(DIScope *Context, StringRef Name,
+                                           DIType *Ty, StringRef Val) {
   return createTemplateValueParameterHelper(
       VMContext, dwarf::DW_TAG_GNU_template_template_param, Context, Name, Ty,
       MDString::get(VMContext, Val));
 }
 
-MDTemplateValueParameter *
-DIBuilder::createTemplateParameterPack(MDScope *Context, StringRef Name,
-                                       MDType *Ty, DebugNodeArray Val) {
+DITemplateValueParameter *
+DIBuilder::createTemplateParameterPack(DIScope *Context, StringRef Name,
+                                       DIType *Ty, DINodeArray Val) {
   return createTemplateValueParameterHelper(
       VMContext, dwarf::DW_TAG_GNU_template_parameter_pack, Context, Name, Ty,
       Val.get());
 }
 
-MDCompositeType *DIBuilder::createClassType(
-    MDScope *Context, StringRef Name, MDFile *File, unsigned LineNumber,
+DICompositeType *DIBuilder::createClassType(
+    DIScope *Context, StringRef Name, DIFile *File, unsigned LineNumber,
     uint64_t SizeInBits, uint64_t AlignInBits, uint64_t OffsetInBits,
-    unsigned Flags, MDType *DerivedFrom, DebugNodeArray Elements,
-    MDType *VTableHolder, MDNode *TemplateParams, StringRef UniqueIdentifier) {
-  assert((!Context || isa<MDScope>(Context)) &&
+    unsigned Flags, DIType *DerivedFrom, DINodeArray Elements,
+    DIType *VTableHolder, MDNode *TemplateParams, StringRef UniqueIdentifier) {
+  assert((!Context || isa<DIScope>(Context)) &&
          "createClassType should be called with a valid Context");
 
-  auto *R = MDCompositeType::get(
+  auto *R = DICompositeType::get(
       VMContext, dwarf::DW_TAG_structure_type, Name, File, LineNumber,
-      MDScopeRef::get(getNonCompileUnitScope(Context)),
-      MDTypeRef::get(DerivedFrom), SizeInBits, AlignInBits, OffsetInBits, Flags,
-      Elements, 0, MDTypeRef::get(VTableHolder),
+      DIScopeRef::get(getNonCompileUnitScope(Context)),
+      DITypeRef::get(DerivedFrom), SizeInBits, AlignInBits, OffsetInBits, Flags,
+      Elements, 0, DITypeRef::get(VTableHolder),
       cast_or_null<MDTuple>(TemplateParams), UniqueIdentifier);
   if (!UniqueIdentifier.empty())
     retainType(R);
@@ -390,29 +390,29 @@
   return R;
 }
 
-MDCompositeType *DIBuilder::createStructType(
-    MDScope *Context, StringRef Name, MDFile *File, unsigned LineNumber,
+DICompositeType *DIBuilder::createStructType(
+    DIScope *Context, StringRef Name, DIFile *File, unsigned LineNumber,
     uint64_t SizeInBits, uint64_t AlignInBits, unsigned Flags,
-    MDType *DerivedFrom, DebugNodeArray Elements, unsigned RunTimeLang,
-    MDType *VTableHolder, StringRef UniqueIdentifier) {
-  auto *R = MDCompositeType::get(
+    DIType *DerivedFrom, DINodeArray Elements, unsigned RunTimeLang,
+    DIType *VTableHolder, StringRef UniqueIdentifier) {
+  auto *R = DICompositeType::get(
       VMContext, dwarf::DW_TAG_structure_type, Name, File, LineNumber,
-      MDScopeRef::get(getNonCompileUnitScope(Context)),
-      MDTypeRef::get(DerivedFrom), SizeInBits, AlignInBits, 0, Flags, Elements,
-      RunTimeLang, MDTypeRef::get(VTableHolder), nullptr, UniqueIdentifier);
+      DIScopeRef::get(getNonCompileUnitScope(Context)),
+      DITypeRef::get(DerivedFrom), SizeInBits, AlignInBits, 0, Flags, Elements,
+      RunTimeLang, DITypeRef::get(VTableHolder), nullptr, UniqueIdentifier);
   if (!UniqueIdentifier.empty())
     retainType(R);
   trackIfUnresolved(R);
   return R;
 }
 
-MDCompositeType *DIBuilder::createUnionType(
-    MDScope *Scope, StringRef Name, MDFile *File, unsigned LineNumber,
+DICompositeType *DIBuilder::createUnionType(
+    DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNumber,
     uint64_t SizeInBits, uint64_t AlignInBits, unsigned Flags,
-    DebugNodeArray Elements, unsigned RunTimeLang, StringRef UniqueIdentifier) {
-  auto *R = MDCompositeType::get(
+    DINodeArray Elements, unsigned RunTimeLang, StringRef UniqueIdentifier) {
+  auto *R = DICompositeType::get(
       VMContext, dwarf::DW_TAG_union_type, Name, File, LineNumber,
-      MDScopeRef::get(getNonCompileUnitScope(Scope)), nullptr, SizeInBits,
+      DIScopeRef::get(getNonCompileUnitScope(Scope)), nullptr, SizeInBits,
       AlignInBits, 0, Flags, Elements, RunTimeLang, nullptr, nullptr,
       UniqueIdentifier);
   if (!UniqueIdentifier.empty())
@@ -421,20 +421,20 @@
   return R;
 }
 
-MDSubroutineType *DIBuilder::createSubroutineType(MDFile *File,
-                                                  MDTypeRefArray ParameterTypes,
+DISubroutineType *DIBuilder::createSubroutineType(DIFile *File,
+                                                  DITypeRefArray ParameterTypes,
                                                   unsigned Flags) {
-  return MDSubroutineType::get(VMContext, Flags, ParameterTypes);
+  return DISubroutineType::get(VMContext, Flags, ParameterTypes);
 }
 
-MDCompositeType *DIBuilder::createEnumerationType(
-    MDScope *Scope, StringRef Name, MDFile *File, unsigned LineNumber,
-    uint64_t SizeInBits, uint64_t AlignInBits, DebugNodeArray Elements,
-    MDType *UnderlyingType, StringRef UniqueIdentifier) {
-  auto *CTy = MDCompositeType::get(
+DICompositeType *DIBuilder::createEnumerationType(
+    DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNumber,
+    uint64_t SizeInBits, uint64_t AlignInBits, DINodeArray Elements,
+    DIType *UnderlyingType, StringRef UniqueIdentifier) {
+  auto *CTy = DICompositeType::get(
       VMContext, dwarf::DW_TAG_enumeration_type, Name, File, LineNumber,
-      MDScopeRef::get(getNonCompileUnitScope(Scope)),
-      MDTypeRef::get(UnderlyingType), SizeInBits, AlignInBits, 0, 0, Elements,
+      DIScopeRef::get(getNonCompileUnitScope(Scope)),
+      DITypeRef::get(UnderlyingType), SizeInBits, AlignInBits, 0, 0, Elements,
       0, nullptr, nullptr, UniqueIdentifier);
   AllEnumTypes.push_back(CTy);
   if (!UniqueIdentifier.empty())
@@ -443,67 +443,67 @@
   return CTy;
 }
 
-MDCompositeType *DIBuilder::createArrayType(uint64_t Size, uint64_t AlignInBits,
-                                            MDType *Ty,
-                                            DebugNodeArray Subscripts) {
-  auto *R = MDCompositeType::get(VMContext, dwarf::DW_TAG_array_type, "",
-                                 nullptr, 0, nullptr, MDTypeRef::get(Ty), Size,
+DICompositeType *DIBuilder::createArrayType(uint64_t Size, uint64_t AlignInBits,
+                                            DIType *Ty,
+                                            DINodeArray Subscripts) {
+  auto *R = DICompositeType::get(VMContext, dwarf::DW_TAG_array_type, "",
+                                 nullptr, 0, nullptr, DITypeRef::get(Ty), Size,
                                  AlignInBits, 0, 0, Subscripts, 0, nullptr);
   trackIfUnresolved(R);
   return R;
 }
 
-MDCompositeType *DIBuilder::createVectorType(uint64_t Size,
-                                             uint64_t AlignInBits, MDType *Ty,
-                                             DebugNodeArray Subscripts) {
+DICompositeType *DIBuilder::createVectorType(uint64_t Size,
+                                             uint64_t AlignInBits, DIType *Ty,
+                                             DINodeArray Subscripts) {
   auto *R =
-      MDCompositeType::get(VMContext, dwarf::DW_TAG_array_type, "", nullptr, 0,
-                           nullptr, MDTypeRef::get(Ty), Size, AlignInBits, 0,
-                           DebugNode::FlagVector, Subscripts, 0, nullptr);
+      DICompositeType::get(VMContext, dwarf::DW_TAG_array_type, "", nullptr, 0,
+                           nullptr, DITypeRef::get(Ty), Size, AlignInBits, 0,
+                           DINode::FlagVector, Subscripts, 0, nullptr);
   trackIfUnresolved(R);
   return R;
 }
 
-static MDType *createTypeWithFlags(LLVMContext &Context, MDType *Ty,
+static DIType *createTypeWithFlags(LLVMContext &Context, DIType *Ty,
                                    unsigned FlagsToSet) {
   auto NewTy = Ty->clone();
   NewTy->setFlags(NewTy->getFlags() | FlagsToSet);
   return MDNode::replaceWithUniqued(std::move(NewTy));
 }
 
-MDType *DIBuilder::createArtificialType(MDType *Ty) {
+DIType *DIBuilder::createArtificialType(DIType *Ty) {
   // FIXME: Restrict this to the nodes where it's valid.
   if (Ty->isArtificial())
     return Ty;
-  return createTypeWithFlags(VMContext, Ty, DebugNode::FlagArtificial);
+  return createTypeWithFlags(VMContext, Ty, DINode::FlagArtificial);
 }
 
-MDType *DIBuilder::createObjectPointerType(MDType *Ty) {
+DIType *DIBuilder::createObjectPointerType(DIType *Ty) {
   // FIXME: Restrict this to the nodes where it's valid.
   if (Ty->isObjectPointer())
     return Ty;
-  unsigned Flags = DebugNode::FlagObjectPointer | DebugNode::FlagArtificial;
+  unsigned Flags = DINode::FlagObjectPointer | DINode::FlagArtificial;
   return createTypeWithFlags(VMContext, Ty, Flags);
 }
 
-void DIBuilder::retainType(MDType *T) {
+void DIBuilder::retainType(DIType *T) {
   assert(T && "Expected non-null type");
   AllRetainTypes.emplace_back(T);
 }
 
-MDBasicType *DIBuilder::createUnspecifiedParameter() { return nullptr; }
+DIBasicType *DIBuilder::createUnspecifiedParameter() { return nullptr; }
 
-MDCompositeType*
-DIBuilder::createForwardDecl(unsigned Tag, StringRef Name, MDScope * Scope,
-                             MDFile* F, unsigned Line, unsigned RuntimeLang,
+DICompositeType *
+DIBuilder::createForwardDecl(unsigned Tag, StringRef Name, DIScope *Scope,
+                             DIFile *F, unsigned Line, unsigned RuntimeLang,
                              uint64_t SizeInBits, uint64_t AlignInBits,
                              StringRef UniqueIdentifier) {
   // FIXME: Define in terms of createReplaceableForwardDecl() by calling
   // replaceWithUniqued().
-  auto *RetTy = MDCompositeType::get(
+  auto *RetTy = DICompositeType::get(
       VMContext, Tag, Name, F, Line,
-      MDScopeRef::get(getNonCompileUnitScope(Scope)), nullptr, SizeInBits,
-      AlignInBits, 0, DebugNode::FlagFwdDecl, nullptr, RuntimeLang, nullptr,
+      DIScopeRef::get(getNonCompileUnitScope(Scope)), nullptr, SizeInBits,
+      AlignInBits, 0, DINode::FlagFwdDecl, nullptr, RuntimeLang, nullptr,
       nullptr, UniqueIdentifier);
   if (!UniqueIdentifier.empty())
     retainType(RetTy);
@@ -511,118 +511,119 @@
   return RetTy;
 }
 
-MDCompositeType* DIBuilder::createReplaceableCompositeType(
-    unsigned Tag, StringRef Name, MDScope * Scope, MDFile* F, unsigned Line,
+DICompositeType *DIBuilder::createReplaceableCompositeType(
+    unsigned Tag, StringRef Name, DIScope *Scope, DIFile *F, unsigned Line,
     unsigned RuntimeLang, uint64_t SizeInBits, uint64_t AlignInBits,
     unsigned Flags, StringRef UniqueIdentifier) {
-  auto *RetTy = MDCompositeType::getTemporary(
+  auto *RetTy = DICompositeType::getTemporary(
                     VMContext, Tag, Name, F, Line,
-                    MDScopeRef::get(getNonCompileUnitScope(Scope)), nullptr,
+                    DIScopeRef::get(getNonCompileUnitScope(Scope)), nullptr,
                     SizeInBits, AlignInBits, 0, Flags, nullptr, RuntimeLang,
-                    nullptr, nullptr, UniqueIdentifier).release();
+                    nullptr, nullptr, UniqueIdentifier)
+                    .release();
   if (!UniqueIdentifier.empty())
     retainType(RetTy);
   trackIfUnresolved(RetTy);
   return RetTy;
 }
 
-DebugNodeArray DIBuilder::getOrCreateArray(ArrayRef<Metadata *> Elements) {
+DINodeArray DIBuilder::getOrCreateArray(ArrayRef<Metadata *> Elements) {
   return MDTuple::get(VMContext, Elements);
 }
 
-MDTypeRefArray DIBuilder::getOrCreateTypeArray(ArrayRef<Metadata *> Elements) {
+DITypeRefArray DIBuilder::getOrCreateTypeArray(ArrayRef<Metadata *> Elements) {
   SmallVector<llvm::Metadata *, 16> Elts;
   for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
     if (Elements[i] && isa<MDNode>(Elements[i]))
-      Elts.push_back(MDTypeRef::get(cast<MDType>(Elements[i])));
+      Elts.push_back(DITypeRef::get(cast<DIType>(Elements[i])));
     else
       Elts.push_back(Elements[i]);
   }
-  return MDTypeRefArray(MDNode::get(VMContext, Elts));
+  return DITypeRefArray(MDNode::get(VMContext, Elts));
 }
 
-MDSubrange *DIBuilder::getOrCreateSubrange(int64_t Lo, int64_t Count) {
-  return MDSubrange::get(VMContext, Count, Lo);
+DISubrange *DIBuilder::getOrCreateSubrange(int64_t Lo, int64_t Count) {
+  return DISubrange::get(VMContext, Count, Lo);
 }
 
-static void checkGlobalVariableScope(MDScope * Context) {
+static void checkGlobalVariableScope(DIScope *Context) {
 #ifndef NDEBUG
   if (auto *CT =
-          dyn_cast_or_null<MDCompositeType>(getNonCompileUnitScope(Context)))
+          dyn_cast_or_null<DICompositeType>(getNonCompileUnitScope(Context)))
     assert(CT->getIdentifier().empty() &&
            "Context of a global variable should not be a type with identifier");
 #endif
 }
 
-MDGlobalVariable *DIBuilder::createGlobalVariable(
-    MDScope *Context, StringRef Name, StringRef LinkageName, MDFile *F,
-    unsigned LineNumber, MDType *Ty, bool isLocalToUnit, Constant *Val,
+DIGlobalVariable *DIBuilder::createGlobalVariable(
+    DIScope *Context, StringRef Name, StringRef LinkageName, DIFile *F,
+    unsigned LineNumber, DIType *Ty, bool isLocalToUnit, Constant *Val,
     MDNode *Decl) {
   checkGlobalVariableScope(Context);
 
-  auto *N = MDGlobalVariable::get(VMContext, cast_or_null<MDScope>(Context),
+  auto *N = DIGlobalVariable::get(VMContext, cast_or_null<DIScope>(Context),
                                   Name, LinkageName, F, LineNumber,
-                                  MDTypeRef::get(Ty), isLocalToUnit, true, Val,
-                                  cast_or_null<MDDerivedType>(Decl));
+                                  DITypeRef::get(Ty), isLocalToUnit, true, Val,
+                                  cast_or_null<DIDerivedType>(Decl));
   AllGVs.push_back(N);
   return N;
 }
 
-MDGlobalVariable *DIBuilder::createTempGlobalVariableFwdDecl(
-    MDScope *Context, StringRef Name, StringRef LinkageName, MDFile *F,
-    unsigned LineNumber, MDType *Ty, bool isLocalToUnit, Constant *Val,
+DIGlobalVariable *DIBuilder::createTempGlobalVariableFwdDecl(
+    DIScope *Context, StringRef Name, StringRef LinkageName, DIFile *F,
+    unsigned LineNumber, DIType *Ty, bool isLocalToUnit, Constant *Val,
     MDNode *Decl) {
   checkGlobalVariableScope(Context);
 
-  return MDGlobalVariable::getTemporary(
-             VMContext, cast_or_null<MDScope>(Context), Name, LinkageName, F,
-             LineNumber, MDTypeRef::get(Ty), isLocalToUnit, false, Val,
-             cast_or_null<MDDerivedType>(Decl))
+  return DIGlobalVariable::getTemporary(
+             VMContext, cast_or_null<DIScope>(Context), Name, LinkageName, F,
+             LineNumber, DITypeRef::get(Ty), isLocalToUnit, false, Val,
+             cast_or_null<DIDerivedType>(Decl))
       .release();
 }
 
-MDLocalVariable *DIBuilder::createLocalVariable(
-    unsigned Tag, MDScope *Scope, StringRef Name, MDFile *File, unsigned LineNo,
-    MDType *Ty, bool AlwaysPreserve, unsigned Flags, unsigned ArgNo) {
+DILocalVariable *DIBuilder::createLocalVariable(
+    unsigned Tag, DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNo,
+    DIType *Ty, bool AlwaysPreserve, unsigned Flags, unsigned ArgNo) {
   // FIXME: Why getNonCompileUnitScope()?
   // FIXME: Why is "!Context" okay here?
   // FIXME: WHy doesn't this check for a subprogram or lexical block (AFAICT
   // the only valid scopes)?
-  MDScope* Context = getNonCompileUnitScope(Scope);
+  DIScope *Context = getNonCompileUnitScope(Scope);
 
-  auto *Node = MDLocalVariable::get(
-      VMContext, Tag, cast_or_null<MDLocalScope>(Context), Name, File, LineNo,
-      MDTypeRef::get(Ty), ArgNo, Flags);
+  auto *Node = DILocalVariable::get(
+      VMContext, Tag, cast_or_null<DILocalScope>(Context), Name, File, LineNo,
+      DITypeRef::get(Ty), ArgNo, Flags);
   if (AlwaysPreserve) {
     // The optimizer may remove local variable. If there is an interest
     // to preserve variable info in such situation then stash it in a
     // named mdnode.
-    MDSubprogram *Fn = getDISubprogram(Scope);
+    DISubprogram *Fn = getDISubprogram(Scope);
     assert(Fn && "Missing subprogram for local variable");
     PreservedVariables[Fn].emplace_back(Node);
   }
   return Node;
 }
 
-MDExpression* DIBuilder::createExpression(ArrayRef<uint64_t> Addr) {
-  return MDExpression::get(VMContext, Addr);
+DIExpression *DIBuilder::createExpression(ArrayRef<uint64_t> Addr) {
+  return DIExpression::get(VMContext, Addr);
 }
 
-MDExpression* DIBuilder::createExpression(ArrayRef<int64_t> Signed) {
+DIExpression *DIBuilder::createExpression(ArrayRef<int64_t> Signed) {
   // TODO: Remove the callers of this signed version and delete.
   SmallVector<uint64_t, 8> Addr(Signed.begin(), Signed.end());
   return createExpression(Addr);
 }
 
-MDExpression* DIBuilder::createBitPieceExpression(unsigned OffsetInBytes,
-                                                 unsigned SizeInBytes) {
+DIExpression *DIBuilder::createBitPieceExpression(unsigned OffsetInBytes,
+                                                  unsigned SizeInBytes) {
   uint64_t Addr[] = {dwarf::DW_OP_bit_piece, OffsetInBytes, SizeInBytes};
-  return MDExpression::get(VMContext, Addr);
+  return DIExpression::get(VMContext, Addr);
 }
 
-MDSubprogram *DIBuilder::createFunction(MDScopeRef Context, StringRef Name,
-                                        StringRef LinkageName, MDFile *File,
-                                        unsigned LineNo, MDSubroutineType *Ty,
+DISubprogram *DIBuilder::createFunction(DIScopeRef Context, StringRef Name,
+                                        StringRef LinkageName, DIFile *File,
+                                        unsigned LineNo, DISubroutineType *Ty,
                                         bool isLocalToUnit, bool isDefinition,
                                         unsigned ScopeLine, unsigned Flags,
                                         bool isOptimized, Function *Fn,
@@ -635,20 +636,20 @@
                         Flags, isOptimized, Fn, TParams, Decl);
 }
 
-MDSubprogram* DIBuilder::createFunction(MDScope * Context, StringRef Name,
-                                       StringRef LinkageName, MDFile* File,
-                                       unsigned LineNo, MDSubroutineType* Ty,
-                                       bool isLocalToUnit, bool isDefinition,
-                                       unsigned ScopeLine, unsigned Flags,
-                                       bool isOptimized, Function *Fn,
-                                       MDNode *TParams, MDNode *Decl) {
+DISubprogram *DIBuilder::createFunction(DIScope *Context, StringRef Name,
+                                        StringRef LinkageName, DIFile *File,
+                                        unsigned LineNo, DISubroutineType *Ty,
+                                        bool isLocalToUnit, bool isDefinition,
+                                        unsigned ScopeLine, unsigned Flags,
+                                        bool isOptimized, Function *Fn,
+                                        MDNode *TParams, MDNode *Decl) {
   assert(Ty->getTag() == dwarf::DW_TAG_subroutine_type &&
          "function types should be subroutines");
-  auto *Node = MDSubprogram::get(
-      VMContext, MDScopeRef::get(getNonCompileUnitScope(Context)), Name,
-      LinkageName, File, LineNo, Ty,
-      isLocalToUnit, isDefinition, ScopeLine, nullptr, 0, 0, Flags, isOptimized,
-      Fn, cast_or_null<MDTuple>(TParams), cast_or_null<MDSubprogram>(Decl),
+  auto *Node = DISubprogram::get(
+      VMContext, DIScopeRef::get(getNonCompileUnitScope(Context)), Name,
+      LinkageName, File, LineNo, Ty, isLocalToUnit, isDefinition, ScopeLine,
+      nullptr, 0, 0, Flags, isOptimized, Fn, cast_or_null<MDTuple>(TParams),
+      cast_or_null<DISubprogram>(Decl),
       MDTuple::getTemporary(VMContext, None).release());
 
   if (isDefinition)
@@ -657,27 +658,25 @@
   return Node;
 }
 
-MDSubprogram*
-DIBuilder::createTempFunctionFwdDecl(MDScope * Context, StringRef Name,
-                                     StringRef LinkageName, MDFile* File,
-                                     unsigned LineNo, MDSubroutineType* Ty,
-                                     bool isLocalToUnit, bool isDefinition,
-                                     unsigned ScopeLine, unsigned Flags,
-                                     bool isOptimized, Function *Fn,
-                                     MDNode *TParams, MDNode *Decl) {
-  return MDSubprogram::getTemporary(
-             VMContext, MDScopeRef::get(getNonCompileUnitScope(Context)), Name,
-             LinkageName, File, LineNo, Ty,
-             isLocalToUnit, isDefinition, ScopeLine, nullptr, 0, 0, Flags,
-             isOptimized, Fn, cast_or_null<MDTuple>(TParams),
-             cast_or_null<MDSubprogram>(Decl), nullptr).release();
+DISubprogram *DIBuilder::createTempFunctionFwdDecl(
+    DIScope *Context, StringRef Name, StringRef LinkageName, DIFile *File,
+    unsigned LineNo, DISubroutineType *Ty, bool isLocalToUnit,
+    bool isDefinition, unsigned ScopeLine, unsigned Flags, bool isOptimized,
+    Function *Fn, MDNode *TParams, MDNode *Decl) {
+  return DISubprogram::getTemporary(
+             VMContext, DIScopeRef::get(getNonCompileUnitScope(Context)), Name,
+             LinkageName, File, LineNo, Ty, isLocalToUnit, isDefinition,
+             ScopeLine, nullptr, 0, 0, Flags, isOptimized, Fn,
+             cast_or_null<MDTuple>(TParams), cast_or_null<DISubprogram>(Decl),
+             nullptr)
+      .release();
 }
 
-MDSubprogram *
-DIBuilder::createMethod(MDScope *Context, StringRef Name, StringRef LinkageName,
-                        MDFile *F, unsigned LineNo, MDSubroutineType *Ty,
+DISubprogram *
+DIBuilder::createMethod(DIScope *Context, StringRef Name, StringRef LinkageName,
+                        DIFile *F, unsigned LineNo, DISubroutineType *Ty,
                         bool isLocalToUnit, bool isDefinition, unsigned VK,
-                        unsigned VIndex, MDType *VTableHolder, unsigned Flags,
+                        unsigned VIndex, DIType *VTableHolder, unsigned Flags,
                         bool isOptimized, Function *Fn, MDNode *TParam) {
   assert(Ty->getTag() == dwarf::DW_TAG_subroutine_type &&
          "function types should be subroutines");
@@ -685,10 +684,10 @@
          "Methods should have both a Context and a context that isn't "
          "the compile unit.");
   // FIXME: Do we want to use different scope/lines?
-  auto *SP = MDSubprogram::get(
-      VMContext, MDScopeRef::get(cast<MDScope>(Context)), Name, LinkageName, F,
+  auto *SP = DISubprogram::get(
+      VMContext, DIScopeRef::get(cast<DIScope>(Context)), Name, LinkageName, F,
       LineNo, Ty, isLocalToUnit, isDefinition, LineNo,
-      MDTypeRef::get(VTableHolder), VK, VIndex, Flags, isOptimized, Fn,
+      DITypeRef::get(VTableHolder), VK, VIndex, Flags, isOptimized, Fn,
       cast_or_null<MDTuple>(TParam), nullptr, nullptr);
 
   if (isDefinition)
@@ -697,23 +696,23 @@
   return SP;
 }
 
-MDNamespace* DIBuilder::createNameSpace(MDScope * Scope, StringRef Name,
-                                       MDFile* File, unsigned LineNo) {
-  return MDNamespace::get(VMContext, getNonCompileUnitScope(Scope), File, Name,
+DINamespace *DIBuilder::createNameSpace(DIScope *Scope, StringRef Name,
+                                        DIFile *File, unsigned LineNo) {
+  return DINamespace::get(VMContext, getNonCompileUnitScope(Scope), File, Name,
                           LineNo);
 }
 
-MDLexicalBlockFile* DIBuilder::createLexicalBlockFile(MDScope * Scope,
-                                                     MDFile* File,
-                                                     unsigned Discriminator) {
-  return MDLexicalBlockFile::get(VMContext, Scope, File, Discriminator);
+DILexicalBlockFile *DIBuilder::createLexicalBlockFile(DIScope *Scope,
+                                                      DIFile *File,
+                                                      unsigned Discriminator) {
+  return DILexicalBlockFile::get(VMContext, Scope, File, Discriminator);
 }
 
-MDLexicalBlock* DIBuilder::createLexicalBlock(MDScope * Scope, MDFile* File,
-                                             unsigned Line, unsigned Col) {
+DILexicalBlock *DIBuilder::createLexicalBlock(DIScope *Scope, DIFile *File,
+                                              unsigned Line, unsigned Col) {
   // Make these distinct, to avoid merging two lexical blocks on the same
   // file/line/column.
-  return MDLexicalBlock::getDistinct(VMContext, getNonCompileUnitScope(Scope),
+  return DILexicalBlock::getDistinct(VMContext, getNonCompileUnitScope(Scope),
                                      File, Line, Col);
 }
 
@@ -722,15 +721,15 @@
   return MetadataAsValue::get(VMContext, ValueAsMetadata::get(V));
 }
 
-static Instruction *withDebugLoc(Instruction *I, const MDLocation *DL) {
-  I->setDebugLoc(const_cast<MDLocation *>(DL));
+static Instruction *withDebugLoc(Instruction *I, const DILocation *DL) {
+  I->setDebugLoc(const_cast<DILocation *>(DL));
   return I;
 }
 
-Instruction *DIBuilder::insertDeclare(Value *Storage, MDLocalVariable* VarInfo,
-                                      MDExpression* Expr, const MDLocation *DL,
+Instruction *DIBuilder::insertDeclare(Value *Storage, DILocalVariable *VarInfo,
+                                      DIExpression *Expr, const DILocation *DL,
                                       Instruction *InsertBefore) {
-  assert(VarInfo && "empty or invalid MDLocalVariable* passed to dbg.declare");
+  assert(VarInfo && "empty or invalid DILocalVariable* passed to dbg.declare");
   assert(DL && "Expected debug loc");
   assert(DL->getScope()->getSubprogram() ==
              VarInfo->getScope()->getSubprogram() &&
@@ -746,10 +745,10 @@
   return withDebugLoc(CallInst::Create(DeclareFn, Args, "", InsertBefore), DL);
 }
 
-Instruction *DIBuilder::insertDeclare(Value *Storage, MDLocalVariable* VarInfo,
-                                      MDExpression* Expr, const MDLocation *DL,
+Instruction *DIBuilder::insertDeclare(Value *Storage, DILocalVariable *VarInfo,
+                                      DIExpression *Expr, const DILocation *DL,
                                       BasicBlock *InsertAtEnd) {
-  assert(VarInfo && "empty or invalid MDLocalVariable* passed to dbg.declare");
+  assert(VarInfo && "empty or invalid DILocalVariable* passed to dbg.declare");
   assert(DL && "Expected debug loc");
   assert(DL->getScope()->getSubprogram() ==
              VarInfo->getScope()->getSubprogram() &&
@@ -771,12 +770,12 @@
 }
 
 Instruction *DIBuilder::insertDbgValueIntrinsic(Value *V, uint64_t Offset,
-                                                MDLocalVariable* VarInfo,
-                                                MDExpression* Expr,
-                                                const MDLocation *DL,
+                                                DILocalVariable *VarInfo,
+                                                DIExpression *Expr,
+                                                const DILocation *DL,
                                                 Instruction *InsertBefore) {
   assert(V && "no value passed to dbg.value");
-  assert(VarInfo && "empty or invalid MDLocalVariable* passed to dbg.value");
+  assert(VarInfo && "empty or invalid DILocalVariable* passed to dbg.value");
   assert(DL && "Expected debug loc");
   assert(DL->getScope()->getSubprogram() ==
              VarInfo->getScope()->getSubprogram() &&
@@ -794,12 +793,12 @@
 }
 
 Instruction *DIBuilder::insertDbgValueIntrinsic(Value *V, uint64_t Offset,
-                                                MDLocalVariable* VarInfo,
-                                                MDExpression* Expr,
-                                                const MDLocation *DL,
+                                                DILocalVariable *VarInfo,
+                                                DIExpression *Expr,
+                                                const DILocation *DL,
                                                 BasicBlock *InsertAtEnd) {
   assert(V && "no value passed to dbg.value");
-  assert(VarInfo && "empty or invalid MDLocalVariable* passed to dbg.value");
+  assert(VarInfo && "empty or invalid DILocalVariable* passed to dbg.value");
   assert(DL && "Expected debug loc");
   assert(DL->getScope()->getSubprogram() ==
              VarInfo->getScope()->getSubprogram() &&
@@ -817,10 +816,11 @@
   return withDebugLoc(CallInst::Create(ValueFn, Args, "", InsertAtEnd), DL);
 }
 
-void DIBuilder::replaceVTableHolder(MDCompositeType* &T, MDCompositeType* VTableHolder) {
+void DIBuilder::replaceVTableHolder(DICompositeType *&T,
+                                    DICompositeType *VTableHolder) {
   {
-    TypedTrackingMDRef<MDCompositeType> N(T);
-    N->replaceVTableHolder(MDTypeRef::get(VTableHolder));
+    TypedTrackingMDRef<DICompositeType> N(T);
+    N->replaceVTableHolder(DITypeRef::get(VTableHolder));
     T = N.get();
   }
 
@@ -836,14 +836,14 @@
         trackIfUnresolved(N);
 }
 
-void DIBuilder::replaceArrays(MDCompositeType *&T, DebugNodeArray Elements,
-                              DebugNodeArray TParams) {
+void DIBuilder::replaceArrays(DICompositeType *&T, DINodeArray Elements,
+                              DINodeArray TParams) {
   {
-    TypedTrackingMDRef<MDCompositeType> N(T);
+    TypedTrackingMDRef<DICompositeType> N(T);
     if (Elements)
       N->replaceElements(Elements);
     if (TParams)
-      N->replaceTemplateParams(MDTemplateParameterArray(TParams));
+      N->replaceTemplateParams(DITemplateParameterArray(TParams));
     T = N.get();
   }
 
diff --git a/llvm/lib/IR/DebugInfo.cpp b/llvm/lib/IR/DebugInfo.cpp
index ccc2c7c..2e161c2 100644
--- a/llvm/lib/IR/DebugInfo.cpp
+++ b/llvm/lib/IR/DebugInfo.cpp
@@ -33,13 +33,13 @@
 using namespace llvm;
 using namespace llvm::dwarf;
 
-MDSubprogram *llvm::getDISubprogram(const MDNode *Scope) {
-  if (auto *LocalScope = dyn_cast_or_null<MDLocalScope>(Scope))
+DISubprogram *llvm::getDISubprogram(const MDNode *Scope) {
+  if (auto *LocalScope = dyn_cast_or_null<DILocalScope>(Scope))
     return LocalScope->getSubprogram();
   return nullptr;
 }
 
-MDSubprogram *llvm::getDISubprogram(const Function *F) {
+DISubprogram *llvm::getDISubprogram(const Function *F) {
   // We look for the first instr that has a debug annotation leading back to F.
   for (auto &BB : *F) {
     auto Inst = std::find_if(BB.begin(), BB.end(), [](const Instruction &Inst) {
@@ -56,11 +56,11 @@
   return nullptr;
 }
 
-MDCompositeTypeBase *llvm::getDICompositeType(MDType *T) {
-  if (auto *C = dyn_cast_or_null<MDCompositeTypeBase>(T))
+DICompositeTypeBase *llvm::getDICompositeType(DIType *T) {
+  if (auto *C = dyn_cast_or_null<DICompositeTypeBase>(T))
     return C;
 
-  if (auto *D = dyn_cast_or_null<MDDerivedTypeBase>(T)) {
+  if (auto *D = dyn_cast_or_null<DIDerivedTypeBase>(T)) {
     // This function is currently used by dragonegg and dragonegg does
     // not generate identifier for types, so using an empty map to resolve
     // DerivedFrom should be fine.
@@ -75,12 +75,12 @@
 llvm::generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes) {
   DITypeIdentifierMap Map;
   for (unsigned CUi = 0, CUe = CU_Nodes->getNumOperands(); CUi != CUe; ++CUi) {
-    auto *CU = cast<MDCompileUnit>(CU_Nodes->getOperand(CUi));
-    DebugNodeArray Retain = CU->getRetainedTypes();
+    auto *CU = cast<DICompileUnit>(CU_Nodes->getOperand(CUi));
+    DINodeArray Retain = CU->getRetainedTypes();
     for (unsigned Ti = 0, Te = Retain.size(); Ti != Te; ++Ti) {
-      if (!isa<MDCompositeType>(Retain[Ti]))
+      if (!isa<DICompositeType>(Retain[Ti]))
         continue;
-      auto *Ty = cast<MDCompositeType>(Retain[Ti]);
+      auto *Ty = cast<DICompositeType>(Retain[Ti]);
       if (MDString *TypeId = Ty->getRawIdentifier()) {
         // Definition has priority over declaration.
         // Try to insert (TypeId, Ty) to Map.
@@ -123,7 +123,7 @@
   InitializeTypeMap(M);
   if (NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu")) {
     for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
-      auto *CU = cast<MDCompileUnit>(CU_Nodes->getOperand(i));
+      auto *CU = cast<DICompileUnit>(CU_Nodes->getOperand(i));
       addCompileUnit(CU);
       for (auto *DIG : CU->getGlobalVariables()) {
         if (addGlobalVariable(DIG)) {
@@ -139,18 +139,18 @@
         processType(RT);
       for (auto *Import : CU->getImportedEntities()) {
         auto *Entity = Import->getEntity().resolve(TypeIdentifierMap);
-        if (auto *T = dyn_cast<MDType>(Entity))
+        if (auto *T = dyn_cast<DIType>(Entity))
           processType(T);
-        else if (auto *SP = dyn_cast<MDSubprogram>(Entity))
+        else if (auto *SP = dyn_cast<DISubprogram>(Entity))
           processSubprogram(SP);
-        else if (auto *NS = dyn_cast<MDNamespace>(Entity))
+        else if (auto *NS = dyn_cast<DINamespace>(Entity))
           processScope(NS->getScope());
       }
     }
   }
 }
 
-void DebugInfoFinder::processLocation(const Module &M, const MDLocation *Loc) {
+void DebugInfoFinder::processLocation(const Module &M, const DILocation *Loc) {
   if (!Loc)
     return;
   InitializeTypeMap(M);
@@ -158,61 +158,61 @@
   processLocation(M, Loc->getInlinedAt());
 }
 
-void DebugInfoFinder::processType(MDType *DT) {
+void DebugInfoFinder::processType(DIType *DT) {
   if (!addType(DT))
     return;
   processScope(DT->getScope().resolve(TypeIdentifierMap));
-  if (auto *DCT = dyn_cast<MDCompositeTypeBase>(DT)) {
+  if (auto *DCT = dyn_cast<DICompositeTypeBase>(DT)) {
     processType(DCT->getBaseType().resolve(TypeIdentifierMap));
-    if (auto *ST = dyn_cast<MDSubroutineType>(DCT)) {
-      for (MDTypeRef Ref : ST->getTypeArray())
+    if (auto *ST = dyn_cast<DISubroutineType>(DCT)) {
+      for (DITypeRef Ref : ST->getTypeArray())
         processType(Ref.resolve(TypeIdentifierMap));
       return;
     }
     for (Metadata *D : DCT->getElements()) {
-      if (auto *T = dyn_cast<MDType>(D))
+      if (auto *T = dyn_cast<DIType>(D))
         processType(T);
-      else if (auto *SP = dyn_cast<MDSubprogram>(D))
+      else if (auto *SP = dyn_cast<DISubprogram>(D))
         processSubprogram(SP);
     }
-  } else if (auto *DDT = dyn_cast<MDDerivedTypeBase>(DT)) {
+  } else if (auto *DDT = dyn_cast<DIDerivedTypeBase>(DT)) {
     processType(DDT->getBaseType().resolve(TypeIdentifierMap));
   }
 }
 
-void DebugInfoFinder::processScope(MDScope *Scope) {
+void DebugInfoFinder::processScope(DIScope *Scope) {
   if (!Scope)
     return;
-  if (auto *Ty = dyn_cast<MDType>(Scope)) {
+  if (auto *Ty = dyn_cast<DIType>(Scope)) {
     processType(Ty);
     return;
   }
-  if (auto *CU = dyn_cast<MDCompileUnit>(Scope)) {
+  if (auto *CU = dyn_cast<DICompileUnit>(Scope)) {
     addCompileUnit(CU);
     return;
   }
-  if (auto *SP = dyn_cast<MDSubprogram>(Scope)) {
+  if (auto *SP = dyn_cast<DISubprogram>(Scope)) {
     processSubprogram(SP);
     return;
   }
   if (!addScope(Scope))
     return;
-  if (auto *LB = dyn_cast<MDLexicalBlockBase>(Scope)) {
+  if (auto *LB = dyn_cast<DILexicalBlockBase>(Scope)) {
     processScope(LB->getScope());
-  } else if (auto *NS = dyn_cast<MDNamespace>(Scope)) {
+  } else if (auto *NS = dyn_cast<DINamespace>(Scope)) {
     processScope(NS->getScope());
   }
 }
 
-void DebugInfoFinder::processSubprogram(MDSubprogram *SP) {
+void DebugInfoFinder::processSubprogram(DISubprogram *SP) {
   if (!addSubprogram(SP))
     return;
   processScope(SP->getScope().resolve(TypeIdentifierMap));
   processType(SP->getType());
   for (auto *Element : SP->getTemplateParams()) {
-    if (auto *TType = dyn_cast<MDTemplateTypeParameter>(Element)) {
+    if (auto *TType = dyn_cast<DITemplateTypeParameter>(Element)) {
       processType(TType->getType().resolve(TypeIdentifierMap));
-    } else if (auto *TVal = dyn_cast<MDTemplateValueParameter>(Element)) {
+    } else if (auto *TVal = dyn_cast<DITemplateValueParameter>(Element)) {
       processType(TVal->getType().resolve(TypeIdentifierMap));
     }
   }
@@ -225,7 +225,7 @@
     return;
   InitializeTypeMap(M);
 
-  auto *DV = dyn_cast<MDLocalVariable>(N);
+  auto *DV = dyn_cast<DILocalVariable>(N);
   if (!DV)
     return;
 
@@ -241,7 +241,7 @@
     return;
   InitializeTypeMap(M);
 
-  auto *DV = dyn_cast<MDLocalVariable>(N);
+  auto *DV = dyn_cast<DILocalVariable>(N);
   if (!DV)
     return;
 
@@ -251,18 +251,18 @@
   processType(DV->getType().resolve(TypeIdentifierMap));
 }
 
-bool DebugInfoFinder::addType(MDType *DT) {
+bool DebugInfoFinder::addType(DIType *DT) {
   if (!DT)
     return false;
 
   if (!NodesSeen.insert(DT).second)
     return false;
 
-  TYs.push_back(const_cast<MDType *>(DT));
+  TYs.push_back(const_cast<DIType *>(DT));
   return true;
 }
 
-bool DebugInfoFinder::addCompileUnit(MDCompileUnit *CU) {
+bool DebugInfoFinder::addCompileUnit(DICompileUnit *CU) {
   if (!CU)
     return false;
   if (!NodesSeen.insert(CU).second)
@@ -272,7 +272,7 @@
   return true;
 }
 
-bool DebugInfoFinder::addGlobalVariable(MDGlobalVariable *DIG) {
+bool DebugInfoFinder::addGlobalVariable(DIGlobalVariable *DIG) {
   if (!DIG)
     return false;
 
@@ -283,7 +283,7 @@
   return true;
 }
 
-bool DebugInfoFinder::addSubprogram(MDSubprogram *SP) {
+bool DebugInfoFinder::addSubprogram(DISubprogram *SP) {
   if (!SP)
     return false;
 
@@ -294,7 +294,7 @@
   return true;
 }
 
-bool DebugInfoFinder::addScope(MDScope *Scope) {
+bool DebugInfoFinder::addScope(DIScope *Scope) {
   if (!Scope)
     return false;
   // FIXME: Ocaml binding generates a scope with no content, we treat it
@@ -369,16 +369,16 @@
   return 0;
 }
 
-DenseMap<const llvm::Function *, MDSubprogram *>
+DenseMap<const llvm::Function *, DISubprogram *>
 llvm::makeSubprogramMap(const Module &M) {
-  DenseMap<const Function *, MDSubprogram *> R;
+  DenseMap<const Function *, DISubprogram *> R;
 
   NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu");
   if (!CU_Nodes)
     return R;
 
   for (MDNode *N : CU_Nodes->operands()) {
-    auto *CUNode = cast<MDCompileUnit>(N);
+    auto *CUNode = cast<DICompileUnit>(N);
     for (auto *SP : CUNode->getSubprograms()) {
       if (Function *F = SP->getFunction())
         R.insert(std::make_pair(F, SP));
diff --git a/llvm/lib/IR/DebugInfoMetadata.cpp b/llvm/lib/IR/DebugInfoMetadata.cpp
index 4be3563..85335d5 100644
--- a/llvm/lib/IR/DebugInfoMetadata.cpp
+++ b/llvm/lib/IR/DebugInfoMetadata.cpp
@@ -19,9 +19,9 @@
 
 using namespace llvm;
 
-MDLocation::MDLocation(LLVMContext &C, StorageType Storage, unsigned Line,
+DILocation::DILocation(LLVMContext &C, StorageType Storage, unsigned Line,
                        unsigned Column, ArrayRef<Metadata *> MDs)
-    : MDNode(C, MDLocationKind, Storage, MDs) {
+    : MDNode(C, DILocationKind, Storage, MDs) {
   assert((MDs.size() == 1 || MDs.size() == 2) &&
          "Expected a scope and optional inlined-at");
 
@@ -38,7 +38,7 @@
     Column = 0;
 }
 
-MDLocation *MDLocation::getImpl(LLVMContext &Context, unsigned Line,
+DILocation *DILocation::getImpl(LLVMContext &Context, unsigned Line,
                                 unsigned Column, Metadata *Scope,
                                 Metadata *InlinedAt, StorageType Storage,
                                 bool ShouldCreate) {
@@ -48,8 +48,8 @@
   assert(Scope && "Expected scope");
   if (Storage == Uniqued) {
     if (auto *N =
-            getUniqued(Context.pImpl->MDLocations,
-                       MDLocationInfo::KeyTy(Line, Column, Scope, InlinedAt)))
+            getUniqued(Context.pImpl->DILocations,
+                       DILocationInfo::KeyTy(Line, Column, Scope, InlinedAt)))
       return N;
     if (!ShouldCreate)
       return nullptr;
@@ -62,11 +62,11 @@
   if (InlinedAt)
     Ops.push_back(InlinedAt);
   return storeImpl(new (Ops.size())
-                       MDLocation(Context, Storage, Line, Column, Ops),
-                   Storage, Context.pImpl->MDLocations);
+                       DILocation(Context, Storage, Line, Column, Ops),
+                   Storage, Context.pImpl->DILocations);
 }
 
-unsigned MDLocation::computeNewDiscriminator() const {
+unsigned DILocation::computeNewDiscriminator() const {
   // FIXME: This seems completely wrong.
   //
   //  1. If two modules are generated in the same context, then the second
@@ -83,14 +83,14 @@
   return ++getContext().pImpl->DiscriminatorTable[Key];
 }
 
-unsigned DebugNode::getFlag(StringRef Flag) {
+unsigned DINode::getFlag(StringRef Flag) {
   return StringSwitch<unsigned>(Flag)
 #define HANDLE_DI_FLAG(ID, NAME) .Case("DIFlag" #NAME, Flag##NAME)
 #include "llvm/IR/DebugInfoFlags.def"
       .Default(0);
 }
 
-const char *DebugNode::getFlagString(unsigned Flag) {
+const char *DINode::getFlagString(unsigned Flag) {
   switch (Flag) {
   default:
     return "";
@@ -101,8 +101,8 @@
   }
 }
 
-unsigned DebugNode::splitFlags(unsigned Flags,
-                               SmallVectorImpl<unsigned> &SplitFlags) {
+unsigned DINode::splitFlags(unsigned Flags,
+                            SmallVectorImpl<unsigned> &SplitFlags) {
   // Accessibility flags need to be specially handled, since they're packed
   // together.
   if (unsigned A = Flags & FlagAccessibility) {
@@ -125,33 +125,33 @@
   return Flags;
 }
 
-MDScopeRef MDScope::getScope() const {
-  if (auto *T = dyn_cast<MDType>(this))
+DIScopeRef DIScope::getScope() const {
+  if (auto *T = dyn_cast<DIType>(this))
     return T->getScope();
 
-  if (auto *SP = dyn_cast<MDSubprogram>(this))
+  if (auto *SP = dyn_cast<DISubprogram>(this))
     return SP->getScope();
 
-  if (auto *LB = dyn_cast<MDLexicalBlockBase>(this))
-    return MDScopeRef(LB->getScope());
+  if (auto *LB = dyn_cast<DILexicalBlockBase>(this))
+    return DIScopeRef(LB->getScope());
 
-  if (auto *NS = dyn_cast<MDNamespace>(this))
-    return MDScopeRef(NS->getScope());
+  if (auto *NS = dyn_cast<DINamespace>(this))
+    return DIScopeRef(NS->getScope());
 
-  assert((isa<MDFile>(this) || isa<MDCompileUnit>(this)) &&
+  assert((isa<DIFile>(this) || isa<DICompileUnit>(this)) &&
          "Unhandled type of scope.");
   return nullptr;
 }
 
-StringRef MDScope::getName() const {
-  if (auto *T = dyn_cast<MDType>(this))
+StringRef DIScope::getName() const {
+  if (auto *T = dyn_cast<DIType>(this))
     return T->getName();
-  if (auto *SP = dyn_cast<MDSubprogram>(this))
+  if (auto *SP = dyn_cast<DISubprogram>(this))
     return SP->getName();
-  if (auto *NS = dyn_cast<MDNamespace>(this))
+  if (auto *NS = dyn_cast<DINamespace>(this))
     return NS->getName();
-  assert((isa<MDLexicalBlockBase>(this) || isa<MDFile>(this) ||
-          isa<MDCompileUnit>(this)) &&
+  assert((isa<DILexicalBlockBase>(this) || isa<DIFile>(this) ||
+          isa<DICompileUnit>(this)) &&
          "Unhandled type of scope.");
   return "";
 }
@@ -168,15 +168,14 @@
 }
 #endif
 
-GenericDebugNode *GenericDebugNode::getImpl(LLVMContext &Context, unsigned Tag,
-                                            MDString *Header,
-                                            ArrayRef<Metadata *> DwarfOps,
-                                            StorageType Storage,
-                                            bool ShouldCreate) {
+GenericDINode *GenericDINode::getImpl(LLVMContext &Context, unsigned Tag,
+                                      MDString *Header,
+                                      ArrayRef<Metadata *> DwarfOps,
+                                      StorageType Storage, bool ShouldCreate) {
   unsigned Hash = 0;
   if (Storage == Uniqued) {
-    GenericDebugNodeInfo::KeyTy Key(Tag, getString(Header), DwarfOps);
-    if (auto *N = getUniqued(Context.pImpl->GenericDebugNodes, Key))
+    GenericDINodeInfo::KeyTy Key(Tag, getString(Header), DwarfOps);
+    if (auto *N = getUniqued(Context.pImpl->GenericDINodes, Key))
       return N;
     if (!ShouldCreate)
       return nullptr;
@@ -188,13 +187,13 @@
   // Use a nullptr for empty headers.
   assert(isCanonical(Header) && "Expected canonical MDString");
   Metadata *PreOps[] = {Header};
-  return storeImpl(new (DwarfOps.size() + 1) GenericDebugNode(
+  return storeImpl(new (DwarfOps.size() + 1) GenericDINode(
                        Context, Storage, Hash, Tag, PreOps, DwarfOps),
-                   Storage, Context.pImpl->GenericDebugNodes);
+                   Storage, Context.pImpl->GenericDINodes);
 }
 
-void GenericDebugNode::recalculateHash() {
-  setHash(GenericDebugNodeInfo::KeyTy::calculateHash(this));
+void GenericDINode::recalculateHash() {
+  setHash(GenericDINodeInfo::KeyTy::calculateHash(this));
 }
 
 #define UNWRAP_ARGS_IMPL(...) __VA_ARGS__
@@ -224,49 +223,49 @@
                        CLASS(Context, Storage, OPS),                           \
                    Storage, Context.pImpl->CLASS##s)
 
-MDSubrange *MDSubrange::getImpl(LLVMContext &Context, int64_t Count, int64_t Lo,
+DISubrange *DISubrange::getImpl(LLVMContext &Context, int64_t Count, int64_t Lo,
                                 StorageType Storage, bool ShouldCreate) {
-  DEFINE_GETIMPL_LOOKUP(MDSubrange, (Count, Lo));
-  DEFINE_GETIMPL_STORE_NO_OPS(MDSubrange, (Count, Lo));
+  DEFINE_GETIMPL_LOOKUP(DISubrange, (Count, Lo));
+  DEFINE_GETIMPL_STORE_NO_OPS(DISubrange, (Count, Lo));
 }
 
-MDEnumerator *MDEnumerator::getImpl(LLVMContext &Context, int64_t Value,
+DIEnumerator *DIEnumerator::getImpl(LLVMContext &Context, int64_t Value,
                                     MDString *Name, StorageType Storage,
                                     bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDEnumerator, (Value, getString(Name)));
+  DEFINE_GETIMPL_LOOKUP(DIEnumerator, (Value, getString(Name)));
   Metadata *Ops[] = {Name};
-  DEFINE_GETIMPL_STORE(MDEnumerator, (Value), Ops);
+  DEFINE_GETIMPL_STORE(DIEnumerator, (Value), Ops);
 }
 
-MDBasicType *MDBasicType::getImpl(LLVMContext &Context, unsigned Tag,
+DIBasicType *DIBasicType::getImpl(LLVMContext &Context, unsigned Tag,
                                   MDString *Name, uint64_t SizeInBits,
                                   uint64_t AlignInBits, unsigned Encoding,
                                   StorageType Storage, bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
   DEFINE_GETIMPL_LOOKUP(
-      MDBasicType, (Tag, getString(Name), SizeInBits, AlignInBits, Encoding));
+      DIBasicType, (Tag, getString(Name), SizeInBits, AlignInBits, Encoding));
   Metadata *Ops[] = {nullptr, nullptr, Name};
-  DEFINE_GETIMPL_STORE(MDBasicType, (Tag, SizeInBits, AlignInBits, Encoding),
+  DEFINE_GETIMPL_STORE(DIBasicType, (Tag, SizeInBits, AlignInBits, Encoding),
                        Ops);
 }
 
-MDDerivedType *MDDerivedType::getImpl(
+DIDerivedType *DIDerivedType::getImpl(
     LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *File,
     unsigned Line, Metadata *Scope, Metadata *BaseType, uint64_t SizeInBits,
     uint64_t AlignInBits, uint64_t OffsetInBits, unsigned Flags,
     Metadata *ExtraData, StorageType Storage, bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDDerivedType, (Tag, getString(Name), File, Line, Scope,
+  DEFINE_GETIMPL_LOOKUP(DIDerivedType, (Tag, getString(Name), File, Line, Scope,
                                         BaseType, SizeInBits, AlignInBits,
                                         OffsetInBits, Flags, ExtraData));
   Metadata *Ops[] = {File, Scope, Name, BaseType, ExtraData};
   DEFINE_GETIMPL_STORE(
-      MDDerivedType, (Tag, Line, SizeInBits, AlignInBits, OffsetInBits, Flags),
+      DIDerivedType, (Tag, Line, SizeInBits, AlignInBits, OffsetInBits, Flags),
       Ops);
 }
 
-MDCompositeType *MDCompositeType::getImpl(
+DICompositeType *DICompositeType::getImpl(
     LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *File,
     unsigned Line, Metadata *Scope, Metadata *BaseType, uint64_t SizeInBits,
     uint64_t AlignInBits, uint64_t OffsetInBits, unsigned Flags,
@@ -274,39 +273,39 @@
     Metadata *TemplateParams, MDString *Identifier, StorageType Storage,
     bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDCompositeType,
+  DEFINE_GETIMPL_LOOKUP(DICompositeType,
                         (Tag, getString(Name), File, Line, Scope, BaseType,
                          SizeInBits, AlignInBits, OffsetInBits, Flags, Elements,
                          RuntimeLang, VTableHolder, TemplateParams,
                          getString(Identifier)));
   Metadata *Ops[] = {File,     Scope,        Name,           BaseType,
                      Elements, VTableHolder, TemplateParams, Identifier};
-  DEFINE_GETIMPL_STORE(MDCompositeType, (Tag, Line, RuntimeLang, SizeInBits,
+  DEFINE_GETIMPL_STORE(DICompositeType, (Tag, Line, RuntimeLang, SizeInBits,
                                          AlignInBits, OffsetInBits, Flags),
                        Ops);
 }
 
-MDSubroutineType *MDSubroutineType::getImpl(LLVMContext &Context,
+DISubroutineType *DISubroutineType::getImpl(LLVMContext &Context,
                                             unsigned Flags, Metadata *TypeArray,
                                             StorageType Storage,
                                             bool ShouldCreate) {
-  DEFINE_GETIMPL_LOOKUP(MDSubroutineType, (Flags, TypeArray));
+  DEFINE_GETIMPL_LOOKUP(DISubroutineType, (Flags, TypeArray));
   Metadata *Ops[] = {nullptr,   nullptr, nullptr, nullptr,
                      TypeArray, nullptr, nullptr, nullptr};
-  DEFINE_GETIMPL_STORE(MDSubroutineType, (Flags), Ops);
+  DEFINE_GETIMPL_STORE(DISubroutineType, (Flags), Ops);
 }
 
-MDFile *MDFile::getImpl(LLVMContext &Context, MDString *Filename,
+DIFile *DIFile::getImpl(LLVMContext &Context, MDString *Filename,
                         MDString *Directory, StorageType Storage,
                         bool ShouldCreate) {
   assert(isCanonical(Filename) && "Expected canonical MDString");
   assert(isCanonical(Directory) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDFile, (getString(Filename), getString(Directory)));
+  DEFINE_GETIMPL_LOOKUP(DIFile, (getString(Filename), getString(Directory)));
   Metadata *Ops[] = {Filename, Directory};
-  DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(MDFile, Ops);
+  DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(DIFile, Ops);
 }
 
-MDCompileUnit *MDCompileUnit::getImpl(
+DICompileUnit *DICompileUnit::getImpl(
     LLVMContext &Context, unsigned SourceLanguage, Metadata *File,
     MDString *Producer, bool IsOptimized, MDString *Flags,
     unsigned RuntimeVersion, MDString *SplitDebugFilename,
@@ -317,7 +316,7 @@
   assert(isCanonical(Flags) && "Expected canonical MDString");
   assert(isCanonical(SplitDebugFilename) && "Expected canonical MDString");
   DEFINE_GETIMPL_LOOKUP(
-      MDCompileUnit,
+      DICompileUnit,
       (SourceLanguage, File, getString(Producer), IsOptimized, getString(Flags),
        RuntimeVersion, getString(SplitDebugFilename), EmissionKind, EnumTypes,
        RetainedTypes, Subprograms, GlobalVariables, ImportedEntities));
@@ -325,17 +324,17 @@
                      RetainedTypes, Subprograms, GlobalVariables,
                      ImportedEntities};
   DEFINE_GETIMPL_STORE(
-      MDCompileUnit,
+      DICompileUnit,
       (SourceLanguage, IsOptimized, RuntimeVersion, EmissionKind), Ops);
 }
 
-MDSubprogram *MDLocalScope::getSubprogram() const {
-  if (auto *Block = dyn_cast<MDLexicalBlockBase>(this))
+DISubprogram *DILocalScope::getSubprogram() const {
+  if (auto *Block = dyn_cast<DILexicalBlockBase>(this))
     return Block->getScope()->getSubprogram();
-  return const_cast<MDSubprogram *>(cast<MDSubprogram>(this));
+  return const_cast<DISubprogram *>(cast<DISubprogram>(this));
 }
 
-MDSubprogram *MDSubprogram::getImpl(
+DISubprogram *DISubprogram::getImpl(
     LLVMContext &Context, Metadata *Scope, MDString *Name,
     MDString *LinkageName, Metadata *File, unsigned Line, Metadata *Type,
     bool IsLocalToUnit, bool IsDefinition, unsigned ScopeLine,
@@ -345,7 +344,7 @@
     StorageType Storage, bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
   assert(isCanonical(LinkageName) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDSubprogram,
+  DEFINE_GETIMPL_LOOKUP(DISubprogram,
                         (Scope, getString(Name), getString(LinkageName), File,
                          Line, Type, IsLocalToUnit, IsDefinition, ScopeLine,
                          ContainingType, Virtuality, VirtualIndex, Flags,
@@ -354,18 +353,18 @@
   Metadata *Ops[] = {File,           Scope,       Name,           Name,
                      LinkageName,    Type,        ContainingType, Function,
                      TemplateParams, Declaration, Variables};
-  DEFINE_GETIMPL_STORE(MDSubprogram,
+  DEFINE_GETIMPL_STORE(DISubprogram,
                        (Line, ScopeLine, Virtuality, VirtualIndex, Flags,
                         IsLocalToUnit, IsDefinition, IsOptimized),
                        Ops);
 }
 
-Function *MDSubprogram::getFunction() const {
+Function *DISubprogram::getFunction() const {
   // FIXME: Should this be looking through bitcasts?
   return dyn_cast_or_null<Function>(getFunctionConstant());
 }
 
-bool MDSubprogram::describes(const Function *F) const {
+bool DISubprogram::describes(const Function *F) const {
   assert(F && "Invalid function");
   if (F == getFunction())
     return true;
@@ -375,64 +374,64 @@
   return F->getName() == Name;
 }
 
-void MDSubprogram::replaceFunction(Function *F) {
+void DISubprogram::replaceFunction(Function *F) {
   replaceFunction(F ? ConstantAsMetadata::get(F)
                     : static_cast<ConstantAsMetadata *>(nullptr));
 }
 
-MDLexicalBlock *MDLexicalBlock::getImpl(LLVMContext &Context, Metadata *Scope,
+DILexicalBlock *DILexicalBlock::getImpl(LLVMContext &Context, Metadata *Scope,
                                         Metadata *File, unsigned Line,
                                         unsigned Column, StorageType Storage,
                                         bool ShouldCreate) {
   assert(Scope && "Expected scope");
-  DEFINE_GETIMPL_LOOKUP(MDLexicalBlock, (Scope, File, Line, Column));
+  DEFINE_GETIMPL_LOOKUP(DILexicalBlock, (Scope, File, Line, Column));
   Metadata *Ops[] = {File, Scope};
-  DEFINE_GETIMPL_STORE(MDLexicalBlock, (Line, Column), Ops);
+  DEFINE_GETIMPL_STORE(DILexicalBlock, (Line, Column), Ops);
 }
 
-MDLexicalBlockFile *MDLexicalBlockFile::getImpl(LLVMContext &Context,
+DILexicalBlockFile *DILexicalBlockFile::getImpl(LLVMContext &Context,
                                                 Metadata *Scope, Metadata *File,
                                                 unsigned Discriminator,
                                                 StorageType Storage,
                                                 bool ShouldCreate) {
   assert(Scope && "Expected scope");
-  DEFINE_GETIMPL_LOOKUP(MDLexicalBlockFile, (Scope, File, Discriminator));
+  DEFINE_GETIMPL_LOOKUP(DILexicalBlockFile, (Scope, File, Discriminator));
   Metadata *Ops[] = {File, Scope};
-  DEFINE_GETIMPL_STORE(MDLexicalBlockFile, (Discriminator), Ops);
+  DEFINE_GETIMPL_STORE(DILexicalBlockFile, (Discriminator), Ops);
 }
 
-MDNamespace *MDNamespace::getImpl(LLVMContext &Context, Metadata *Scope,
+DINamespace *DINamespace::getImpl(LLVMContext &Context, Metadata *Scope,
                                   Metadata *File, MDString *Name, unsigned Line,
                                   StorageType Storage, bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDNamespace, (Scope, File, getString(Name), Line));
+  DEFINE_GETIMPL_LOOKUP(DINamespace, (Scope, File, getString(Name), Line));
   Metadata *Ops[] = {File, Scope, Name};
-  DEFINE_GETIMPL_STORE(MDNamespace, (Line), Ops);
+  DEFINE_GETIMPL_STORE(DINamespace, (Line), Ops);
 }
 
-MDTemplateTypeParameter *MDTemplateTypeParameter::getImpl(LLVMContext &Context,
+DITemplateTypeParameter *DITemplateTypeParameter::getImpl(LLVMContext &Context,
                                                           MDString *Name,
                                                           Metadata *Type,
                                                           StorageType Storage,
                                                           bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDTemplateTypeParameter, (getString(Name), Type));
+  DEFINE_GETIMPL_LOOKUP(DITemplateTypeParameter, (getString(Name), Type));
   Metadata *Ops[] = {Name, Type};
-  DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(MDTemplateTypeParameter, Ops);
+  DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(DITemplateTypeParameter, Ops);
 }
 
-MDTemplateValueParameter *MDTemplateValueParameter::getImpl(
+DITemplateValueParameter *DITemplateValueParameter::getImpl(
     LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *Type,
     Metadata *Value, StorageType Storage, bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDTemplateValueParameter,
+  DEFINE_GETIMPL_LOOKUP(DITemplateValueParameter,
                         (Tag, getString(Name), Type, Value));
   Metadata *Ops[] = {Name, Type, Value};
-  DEFINE_GETIMPL_STORE(MDTemplateValueParameter, (Tag), Ops);
+  DEFINE_GETIMPL_STORE(DITemplateValueParameter, (Tag), Ops);
 }
 
-MDGlobalVariable *
-MDGlobalVariable::getImpl(LLVMContext &Context, Metadata *Scope, MDString *Name,
+DIGlobalVariable *
+DIGlobalVariable::getImpl(LLVMContext &Context, Metadata *Scope, MDString *Name,
                           MDString *LinkageName, Metadata *File, unsigned Line,
                           Metadata *Type, bool IsLocalToUnit, bool IsDefinition,
                           Metadata *Variable,
@@ -440,17 +439,17 @@
                           StorageType Storage, bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
   assert(isCanonical(LinkageName) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDGlobalVariable,
+  DEFINE_GETIMPL_LOOKUP(DIGlobalVariable,
                         (Scope, getString(Name), getString(LinkageName), File,
                          Line, Type, IsLocalToUnit, IsDefinition, Variable,
                          StaticDataMemberDeclaration));
   Metadata *Ops[] = {Scope, Name,        File,     Type,
                      Name,  LinkageName, Variable, StaticDataMemberDeclaration};
-  DEFINE_GETIMPL_STORE(MDGlobalVariable, (Line, IsLocalToUnit, IsDefinition),
+  DEFINE_GETIMPL_STORE(DIGlobalVariable, (Line, IsLocalToUnit, IsDefinition),
                        Ops);
 }
 
-MDLocalVariable *MDLocalVariable::getImpl(LLVMContext &Context, unsigned Tag,
+DILocalVariable *DILocalVariable::getImpl(LLVMContext &Context, unsigned Tag,
                                           Metadata *Scope, MDString *Name,
                                           Metadata *File, unsigned Line,
                                           Metadata *Type, unsigned Arg,
@@ -461,20 +460,20 @@
 
   assert(Scope && "Expected scope");
   assert(isCanonical(Name) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDLocalVariable, (Tag, Scope, getString(Name), File,
+  DEFINE_GETIMPL_LOOKUP(DILocalVariable, (Tag, Scope, getString(Name), File,
                                           Line, Type, Arg, Flags));
   Metadata *Ops[] = {Scope, Name, File, Type};
-  DEFINE_GETIMPL_STORE(MDLocalVariable, (Tag, Line, Arg, Flags), Ops);
+  DEFINE_GETIMPL_STORE(DILocalVariable, (Tag, Line, Arg, Flags), Ops);
 }
 
-MDExpression *MDExpression::getImpl(LLVMContext &Context,
+DIExpression *DIExpression::getImpl(LLVMContext &Context,
                                     ArrayRef<uint64_t> Elements,
                                     StorageType Storage, bool ShouldCreate) {
-  DEFINE_GETIMPL_LOOKUP(MDExpression, (Elements));
-  DEFINE_GETIMPL_STORE_NO_OPS(MDExpression, (Elements));
+  DEFINE_GETIMPL_LOOKUP(DIExpression, (Elements));
+  DEFINE_GETIMPL_STORE_NO_OPS(DIExpression, (Elements));
 }
 
-unsigned MDExpression::ExprOperand::getSize() const {
+unsigned DIExpression::ExprOperand::getSize() const {
   switch (getOp()) {
   case dwarf::DW_OP_bit_piece:
     return 3;
@@ -485,7 +484,7 @@
   }
 }
 
-bool MDExpression::isValid() const {
+bool DIExpression::isValid() const {
   for (auto I = expr_op_begin(), E = expr_op_end(); I != E; ++I) {
     // Check that there's space for the operand.
     if (I->get() + I->getSize() > E->get())
@@ -506,7 +505,7 @@
   return true;
 }
 
-bool MDExpression::isBitPiece() const {
+bool DIExpression::isBitPiece() const {
   assert(isValid() && "Expected valid expression");
   if (unsigned N = getNumElements())
     if (N >= 3)
@@ -514,38 +513,38 @@
   return false;
 }
 
-uint64_t MDExpression::getBitPieceOffset() const {
+uint64_t DIExpression::getBitPieceOffset() const {
   assert(isBitPiece() && "Expected bit piece");
   return getElement(getNumElements() - 2);
 }
 
-uint64_t MDExpression::getBitPieceSize() const {
+uint64_t DIExpression::getBitPieceSize() const {
   assert(isBitPiece() && "Expected bit piece");
   return getElement(getNumElements() - 1);
 }
 
-MDObjCProperty *MDObjCProperty::getImpl(
+DIObjCProperty *DIObjCProperty::getImpl(
     LLVMContext &Context, MDString *Name, Metadata *File, unsigned Line,
     MDString *GetterName, MDString *SetterName, unsigned Attributes,
     Metadata *Type, StorageType Storage, bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
   assert(isCanonical(GetterName) && "Expected canonical MDString");
   assert(isCanonical(SetterName) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDObjCProperty,
+  DEFINE_GETIMPL_LOOKUP(DIObjCProperty,
                         (getString(Name), File, Line, getString(GetterName),
                          getString(SetterName), Attributes, Type));
   Metadata *Ops[] = {Name, File, GetterName, SetterName, Type};
-  DEFINE_GETIMPL_STORE(MDObjCProperty, (Line, Attributes), Ops);
+  DEFINE_GETIMPL_STORE(DIObjCProperty, (Line, Attributes), Ops);
 }
 
-MDImportedEntity *MDImportedEntity::getImpl(LLVMContext &Context, unsigned Tag,
+DIImportedEntity *DIImportedEntity::getImpl(LLVMContext &Context, unsigned Tag,
                                             Metadata *Scope, Metadata *Entity,
                                             unsigned Line, MDString *Name,
                                             StorageType Storage,
                                             bool ShouldCreate) {
   assert(isCanonical(Name) && "Expected canonical MDString");
-  DEFINE_GETIMPL_LOOKUP(MDImportedEntity,
+  DEFINE_GETIMPL_LOOKUP(DIImportedEntity,
                         (Tag, Scope, Entity, Line, getString(Name)));
   Metadata *Ops[] = {Scope, Entity, Name};
-  DEFINE_GETIMPL_STORE(MDImportedEntity, (Tag, Line), Ops);
+  DEFINE_GETIMPL_STORE(DIImportedEntity, (Tag, Line), Ops);
 }
diff --git a/llvm/lib/IR/DebugLoc.cpp b/llvm/lib/IR/DebugLoc.cpp
index 2d00c98..72d5c0e 100644
--- a/llvm/lib/IR/DebugLoc.cpp
+++ b/llvm/lib/IR/DebugLoc.cpp
@@ -16,11 +16,11 @@
 //===----------------------------------------------------------------------===//
 // DebugLoc Implementation
 //===----------------------------------------------------------------------===//
-DebugLoc::DebugLoc(const MDLocation *L) : Loc(const_cast<MDLocation *>(L)) {}
+DebugLoc::DebugLoc(const DILocation *L) : Loc(const_cast<DILocation *>(L)) {}
 DebugLoc::DebugLoc(const MDNode *L) : Loc(const_cast<MDNode *>(L)) {}
 
-MDLocation *DebugLoc::get() const {
-  return cast_or_null<MDLocation>(Loc.get());
+DILocation *DebugLoc::get() const {
+  return cast_or_null<DILocation>(Loc.get());
 }
 
 unsigned DebugLoc::getLine() const {
@@ -38,17 +38,17 @@
   return get()->getScope();
 }
 
-MDLocation *DebugLoc::getInlinedAt() const {
+DILocation *DebugLoc::getInlinedAt() const {
   assert(get() && "Expected valid DebugLoc");
   return get()->getInlinedAt();
 }
 
 MDNode *DebugLoc::getInlinedAtScope() const {
-  return cast<MDLocation>(Loc)->getInlinedAtScope();
+  return cast<DILocation>(Loc)->getInlinedAtScope();
 }
 
 DebugLoc DebugLoc::getFnDebugLoc() const {
-  // FIXME: Add a method on \a MDLocation that does this work.
+  // FIXME: Add a method on \a DILocation that does this work.
   const MDNode *Scope = getInlinedAtScope();
   if (auto *SP = getDISubprogram(Scope))
     return DebugLoc::get(SP->getScopeLine(), 0, SP);
@@ -62,7 +62,7 @@
   if (!Scope)
     return DebugLoc();
 
-  return MDLocation::get(Scope->getContext(), Line, Col,
+  return DILocation::get(Scope->getContext(), Line, Col,
                          const_cast<MDNode *>(Scope),
                          const_cast<MDNode *>(InlinedAt));
 }
@@ -88,7 +88,7 @@
     return;
 
   // Print source line info.
-  auto *Scope = cast<MDScope>(getScope());
+  auto *Scope = cast<DIScope>(getScope());
   OS << Scope->getFilename();
   OS << ':' << getLine();
   if (getCol() != 0)
diff --git a/llvm/lib/IR/DiagnosticInfo.cpp b/llvm/lib/IR/DiagnosticInfo.cpp
index 91635f6..b161d07 100644
--- a/llvm/lib/IR/DiagnosticInfo.cpp
+++ b/llvm/lib/IR/DiagnosticInfo.cpp
@@ -135,7 +135,7 @@
 void DiagnosticInfoOptimizationBase::getLocation(StringRef *Filename,
                                                  unsigned *Line,
                                                  unsigned *Column) const {
-  MDLocation *L = getDebugLoc();
+  DILocation *L = getDebugLoc();
   *Filename = L->getFilename();
   *Line = L->getLine();
   *Column = L->getColumn();
diff --git a/llvm/lib/IR/LLVMContextImpl.h b/llvm/lib/IR/LLVMContextImpl.h
index edffef3..09c2883 100644
--- a/llvm/lib/IR/LLVMContextImpl.h
+++ b/llvm/lib/IR/LLVMContextImpl.h
@@ -228,8 +228,8 @@
   }
 };
 
-/// \brief DenseMapInfo for MDLocation.
-template <> struct MDNodeKeyImpl<MDLocation> {
+/// \brief DenseMapInfo for DILocation.
+template <> struct MDNodeKeyImpl<DILocation> {
   unsigned Line;
   unsigned Column;
   Metadata *Scope;
@@ -239,11 +239,11 @@
                 Metadata *InlinedAt)
       : Line(Line), Column(Column), Scope(Scope), InlinedAt(InlinedAt) {}
 
-  MDNodeKeyImpl(const MDLocation *L)
+  MDNodeKeyImpl(const DILocation *L)
       : Line(L->getLine()), Column(L->getColumn()), Scope(L->getRawScope()),
         InlinedAt(L->getRawInlinedAt()) {}
 
-  bool isKeyOf(const MDLocation *RHS) const {
+  bool isKeyOf(const DILocation *RHS) const {
     return Line == RHS->getLine() && Column == RHS->getColumn() &&
            Scope == RHS->getRawScope() && InlinedAt == RHS->getRawInlinedAt();
   }
@@ -252,57 +252,57 @@
   }
 };
 
-/// \brief DenseMapInfo for GenericDebugNode.
-template <> struct MDNodeKeyImpl<GenericDebugNode> : MDNodeOpsKey {
+/// \brief DenseMapInfo for GenericDINode.
+template <> struct MDNodeKeyImpl<GenericDINode> : MDNodeOpsKey {
   unsigned Tag;
   StringRef Header;
   MDNodeKeyImpl(unsigned Tag, StringRef Header, ArrayRef<Metadata *> DwarfOps)
       : MDNodeOpsKey(DwarfOps), Tag(Tag), Header(Header) {}
-  MDNodeKeyImpl(const GenericDebugNode *N)
+  MDNodeKeyImpl(const GenericDINode *N)
       : MDNodeOpsKey(N, 1), Tag(N->getTag()), Header(N->getHeader()) {}
 
-  bool isKeyOf(const GenericDebugNode *RHS) const {
+  bool isKeyOf(const GenericDINode *RHS) const {
     return Tag == RHS->getTag() && Header == RHS->getHeader() &&
            compareOps(RHS, 1);
   }
 
   unsigned getHashValue() const { return hash_combine(getHash(), Tag, Header); }
 
-  static unsigned calculateHash(GenericDebugNode *N) {
+  static unsigned calculateHash(GenericDINode *N) {
     return MDNodeOpsKey::calculateHash(N, 1);
   }
 };
 
-template <> struct MDNodeKeyImpl<MDSubrange> {
+template <> struct MDNodeKeyImpl<DISubrange> {
   int64_t Count;
   int64_t LowerBound;
 
   MDNodeKeyImpl(int64_t Count, int64_t LowerBound)
       : Count(Count), LowerBound(LowerBound) {}
-  MDNodeKeyImpl(const MDSubrange *N)
+  MDNodeKeyImpl(const DISubrange *N)
       : Count(N->getCount()), LowerBound(N->getLowerBound()) {}
 
-  bool isKeyOf(const MDSubrange *RHS) const {
+  bool isKeyOf(const DISubrange *RHS) const {
     return Count == RHS->getCount() && LowerBound == RHS->getLowerBound();
   }
   unsigned getHashValue() const { return hash_combine(Count, LowerBound); }
 };
 
-template <> struct MDNodeKeyImpl<MDEnumerator> {
+template <> struct MDNodeKeyImpl<DIEnumerator> {
   int64_t Value;
   StringRef Name;
 
   MDNodeKeyImpl(int64_t Value, StringRef Name) : Value(Value), Name(Name) {}
-  MDNodeKeyImpl(const MDEnumerator *N)
+  MDNodeKeyImpl(const DIEnumerator *N)
       : Value(N->getValue()), Name(N->getName()) {}
 
-  bool isKeyOf(const MDEnumerator *RHS) const {
+  bool isKeyOf(const DIEnumerator *RHS) const {
     return Value == RHS->getValue() && Name == RHS->getName();
   }
   unsigned getHashValue() const { return hash_combine(Value, Name); }
 };
 
-template <> struct MDNodeKeyImpl<MDBasicType> {
+template <> struct MDNodeKeyImpl<DIBasicType> {
   unsigned Tag;
   StringRef Name;
   uint64_t SizeInBits;
@@ -313,11 +313,11 @@
                 uint64_t AlignInBits, unsigned Encoding)
       : Tag(Tag), Name(Name), SizeInBits(SizeInBits), AlignInBits(AlignInBits),
         Encoding(Encoding) {}
-  MDNodeKeyImpl(const MDBasicType *N)
+  MDNodeKeyImpl(const DIBasicType *N)
       : Tag(N->getTag()), Name(N->getName()), SizeInBits(N->getSizeInBits()),
         AlignInBits(N->getAlignInBits()), Encoding(N->getEncoding()) {}
 
-  bool isKeyOf(const MDBasicType *RHS) const {
+  bool isKeyOf(const DIBasicType *RHS) const {
     return Tag == RHS->getTag() && Name == RHS->getName() &&
            SizeInBits == RHS->getSizeInBits() &&
            AlignInBits == RHS->getAlignInBits() &&
@@ -328,7 +328,7 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDDerivedType> {
+template <> struct MDNodeKeyImpl<DIDerivedType> {
   unsigned Tag;
   StringRef Name;
   Metadata *File;
@@ -348,14 +348,14 @@
       : Tag(Tag), Name(Name), File(File), Line(Line), Scope(Scope),
         BaseType(BaseType), SizeInBits(SizeInBits), AlignInBits(AlignInBits),
         OffsetInBits(OffsetInBits), Flags(Flags), ExtraData(ExtraData) {}
-  MDNodeKeyImpl(const MDDerivedType *N)
+  MDNodeKeyImpl(const DIDerivedType *N)
       : Tag(N->getTag()), Name(N->getName()), File(N->getRawFile()),
         Line(N->getLine()), Scope(N->getRawScope()),
         BaseType(N->getRawBaseType()), SizeInBits(N->getSizeInBits()),
         AlignInBits(N->getAlignInBits()), OffsetInBits(N->getOffsetInBits()),
         Flags(N->getFlags()), ExtraData(N->getRawExtraData()) {}
 
-  bool isKeyOf(const MDDerivedType *RHS) const {
+  bool isKeyOf(const DIDerivedType *RHS) const {
     return Tag == RHS->getTag() && Name == RHS->getName() &&
            File == RHS->getRawFile() && Line == RHS->getLine() &&
            Scope == RHS->getRawScope() && BaseType == RHS->getRawBaseType() &&
@@ -370,7 +370,7 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDCompositeType> {
+template <> struct MDNodeKeyImpl<DICompositeType> {
   unsigned Tag;
   StringRef Name;
   Metadata *File;
@@ -398,7 +398,7 @@
         OffsetInBits(OffsetInBits), Flags(Flags), Elements(Elements),
         RuntimeLang(RuntimeLang), VTableHolder(VTableHolder),
         TemplateParams(TemplateParams), Identifier(Identifier) {}
-  MDNodeKeyImpl(const MDCompositeType *N)
+  MDNodeKeyImpl(const DICompositeType *N)
       : Tag(N->getTag()), Name(N->getName()), File(N->getRawFile()),
         Line(N->getLine()), Scope(N->getRawScope()),
         BaseType(N->getRawBaseType()), SizeInBits(N->getSizeInBits()),
@@ -408,7 +408,7 @@
         TemplateParams(N->getRawTemplateParams()),
         Identifier(N->getIdentifier()) {}
 
-  bool isKeyOf(const MDCompositeType *RHS) const {
+  bool isKeyOf(const DICompositeType *RHS) const {
     return Tag == RHS->getTag() && Name == RHS->getName() &&
            File == RHS->getRawFile() && Line == RHS->getLine() &&
            Scope == RHS->getRawScope() && BaseType == RHS->getRawBaseType() &&
@@ -428,37 +428,37 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDSubroutineType> {
+template <> struct MDNodeKeyImpl<DISubroutineType> {
   unsigned Flags;
   Metadata *TypeArray;
 
   MDNodeKeyImpl(int64_t Flags, Metadata *TypeArray)
       : Flags(Flags), TypeArray(TypeArray) {}
-  MDNodeKeyImpl(const MDSubroutineType *N)
+  MDNodeKeyImpl(const DISubroutineType *N)
       : Flags(N->getFlags()), TypeArray(N->getRawTypeArray()) {}
 
-  bool isKeyOf(const MDSubroutineType *RHS) const {
+  bool isKeyOf(const DISubroutineType *RHS) const {
     return Flags == RHS->getFlags() && TypeArray == RHS->getRawTypeArray();
   }
   unsigned getHashValue() const { return hash_combine(Flags, TypeArray); }
 };
 
-template <> struct MDNodeKeyImpl<MDFile> {
+template <> struct MDNodeKeyImpl<DIFile> {
   StringRef Filename;
   StringRef Directory;
 
   MDNodeKeyImpl(StringRef Filename, StringRef Directory)
       : Filename(Filename), Directory(Directory) {}
-  MDNodeKeyImpl(const MDFile *N)
+  MDNodeKeyImpl(const DIFile *N)
       : Filename(N->getFilename()), Directory(N->getDirectory()) {}
 
-  bool isKeyOf(const MDFile *RHS) const {
+  bool isKeyOf(const DIFile *RHS) const {
     return Filename == RHS->getFilename() && Directory == RHS->getDirectory();
   }
   unsigned getHashValue() const { return hash_combine(Filename, Directory); }
 };
 
-template <> struct MDNodeKeyImpl<MDCompileUnit> {
+template <> struct MDNodeKeyImpl<DICompileUnit> {
   unsigned SourceLanguage;
   Metadata *File;
   StringRef Producer;
@@ -485,7 +485,7 @@
         EnumTypes(EnumTypes), RetainedTypes(RetainedTypes),
         Subprograms(Subprograms), GlobalVariables(GlobalVariables),
         ImportedEntities(ImportedEntities) {}
-  MDNodeKeyImpl(const MDCompileUnit *N)
+  MDNodeKeyImpl(const DICompileUnit *N)
       : SourceLanguage(N->getSourceLanguage()), File(N->getRawFile()),
         Producer(N->getProducer()), IsOptimized(N->isOptimized()),
         Flags(N->getFlags()), RuntimeVersion(N->getRuntimeVersion()),
@@ -496,7 +496,7 @@
         GlobalVariables(N->getRawGlobalVariables()),
         ImportedEntities(N->getRawImportedEntities()) {}
 
-  bool isKeyOf(const MDCompileUnit *RHS) const {
+  bool isKeyOf(const DICompileUnit *RHS) const {
     return SourceLanguage == RHS->getSourceLanguage() &&
            File == RHS->getRawFile() && Producer == RHS->getProducer() &&
            IsOptimized == RHS->isOptimized() && Flags == RHS->getFlags() &&
@@ -517,7 +517,7 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDSubprogram> {
+template <> struct MDNodeKeyImpl<DISubprogram> {
   Metadata *Scope;
   StringRef Name;
   StringRef LinkageName;
@@ -551,7 +551,7 @@
         VirtualIndex(VirtualIndex), Flags(Flags), IsOptimized(IsOptimized),
         Function(Function), TemplateParams(TemplateParams),
         Declaration(Declaration), Variables(Variables) {}
-  MDNodeKeyImpl(const MDSubprogram *N)
+  MDNodeKeyImpl(const DISubprogram *N)
       : Scope(N->getRawScope()), Name(N->getName()),
         LinkageName(N->getLinkageName()), File(N->getRawFile()),
         Line(N->getLine()), Type(N->getRawType()),
@@ -563,7 +563,7 @@
         TemplateParams(N->getRawTemplateParams()),
         Declaration(N->getRawDeclaration()), Variables(N->getRawVariables()) {}
 
-  bool isKeyOf(const MDSubprogram *RHS) const {
+  bool isKeyOf(const DISubprogram *RHS) const {
     return Scope == RHS->getRawScope() && Name == RHS->getName() &&
            LinkageName == RHS->getLinkageName() && File == RHS->getRawFile() &&
            Line == RHS->getLine() && Type == RHS->getRawType() &&
@@ -587,7 +587,7 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDLexicalBlock> {
+template <> struct MDNodeKeyImpl<DILexicalBlock> {
   Metadata *Scope;
   Metadata *File;
   unsigned Line;
@@ -595,11 +595,11 @@
 
   MDNodeKeyImpl(Metadata *Scope, Metadata *File, unsigned Line, unsigned Column)
       : Scope(Scope), File(File), Line(Line), Column(Column) {}
-  MDNodeKeyImpl(const MDLexicalBlock *N)
+  MDNodeKeyImpl(const DILexicalBlock *N)
       : Scope(N->getRawScope()), File(N->getRawFile()), Line(N->getLine()),
         Column(N->getColumn()) {}
 
-  bool isKeyOf(const MDLexicalBlock *RHS) const {
+  bool isKeyOf(const DILexicalBlock *RHS) const {
     return Scope == RHS->getRawScope() && File == RHS->getRawFile() &&
            Line == RHS->getLine() && Column == RHS->getColumn();
   }
@@ -608,18 +608,18 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDLexicalBlockFile> {
+template <> struct MDNodeKeyImpl<DILexicalBlockFile> {
   Metadata *Scope;
   Metadata *File;
   unsigned Discriminator;
 
   MDNodeKeyImpl(Metadata *Scope, Metadata *File, unsigned Discriminator)
       : Scope(Scope), File(File), Discriminator(Discriminator) {}
-  MDNodeKeyImpl(const MDLexicalBlockFile *N)
+  MDNodeKeyImpl(const DILexicalBlockFile *N)
       : Scope(N->getRawScope()), File(N->getRawFile()),
         Discriminator(N->getDiscriminator()) {}
 
-  bool isKeyOf(const MDLexicalBlockFile *RHS) const {
+  bool isKeyOf(const DILexicalBlockFile *RHS) const {
     return Scope == RHS->getRawScope() && File == RHS->getRawFile() &&
            Discriminator == RHS->getDiscriminator();
   }
@@ -628,7 +628,7 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDNamespace> {
+template <> struct MDNodeKeyImpl<DINamespace> {
   Metadata *Scope;
   Metadata *File;
   StringRef Name;
@@ -636,11 +636,11 @@
 
   MDNodeKeyImpl(Metadata *Scope, Metadata *File, StringRef Name, unsigned Line)
       : Scope(Scope), File(File), Name(Name), Line(Line) {}
-  MDNodeKeyImpl(const MDNamespace *N)
+  MDNodeKeyImpl(const DINamespace *N)
       : Scope(N->getRawScope()), File(N->getRawFile()), Name(N->getName()),
         Line(N->getLine()) {}
 
-  bool isKeyOf(const MDNamespace *RHS) const {
+  bool isKeyOf(const DINamespace *RHS) const {
     return Scope == RHS->getRawScope() && File == RHS->getRawFile() &&
            Name == RHS->getName() && Line == RHS->getLine();
   }
@@ -649,21 +649,21 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDTemplateTypeParameter> {
+template <> struct MDNodeKeyImpl<DITemplateTypeParameter> {
   StringRef Name;
   Metadata *Type;
 
   MDNodeKeyImpl(StringRef Name, Metadata *Type) : Name(Name), Type(Type) {}
-  MDNodeKeyImpl(const MDTemplateTypeParameter *N)
+  MDNodeKeyImpl(const DITemplateTypeParameter *N)
       : Name(N->getName()), Type(N->getRawType()) {}
 
-  bool isKeyOf(const MDTemplateTypeParameter *RHS) const {
+  bool isKeyOf(const DITemplateTypeParameter *RHS) const {
     return Name == RHS->getName() && Type == RHS->getRawType();
   }
   unsigned getHashValue() const { return hash_combine(Name, Type); }
 };
 
-template <> struct MDNodeKeyImpl<MDTemplateValueParameter> {
+template <> struct MDNodeKeyImpl<DITemplateValueParameter> {
   unsigned Tag;
   StringRef Name;
   Metadata *Type;
@@ -671,18 +671,18 @@
 
   MDNodeKeyImpl(unsigned Tag, StringRef Name, Metadata *Type, Metadata *Value)
       : Tag(Tag), Name(Name), Type(Type), Value(Value) {}
-  MDNodeKeyImpl(const MDTemplateValueParameter *N)
+  MDNodeKeyImpl(const DITemplateValueParameter *N)
       : Tag(N->getTag()), Name(N->getName()), Type(N->getRawType()),
         Value(N->getValue()) {}
 
-  bool isKeyOf(const MDTemplateValueParameter *RHS) const {
+  bool isKeyOf(const DITemplateValueParameter *RHS) const {
     return Tag == RHS->getTag() && Name == RHS->getName() &&
            Type == RHS->getRawType() && Value == RHS->getValue();
   }
   unsigned getHashValue() const { return hash_combine(Tag, Name, Type, Value); }
 };
 
-template <> struct MDNodeKeyImpl<MDGlobalVariable> {
+template <> struct MDNodeKeyImpl<DIGlobalVariable> {
   Metadata *Scope;
   StringRef Name;
   StringRef LinkageName;
@@ -702,7 +702,7 @@
         Line(Line), Type(Type), IsLocalToUnit(IsLocalToUnit),
         IsDefinition(IsDefinition), Variable(Variable),
         StaticDataMemberDeclaration(StaticDataMemberDeclaration) {}
-  MDNodeKeyImpl(const MDGlobalVariable *N)
+  MDNodeKeyImpl(const DIGlobalVariable *N)
       : Scope(N->getRawScope()), Name(N->getName()),
         LinkageName(N->getLinkageName()), File(N->getRawFile()),
         Line(N->getLine()), Type(N->getRawType()),
@@ -710,7 +710,7 @@
         Variable(N->getRawVariable()),
         StaticDataMemberDeclaration(N->getRawStaticDataMemberDeclaration()) {}
 
-  bool isKeyOf(const MDGlobalVariable *RHS) const {
+  bool isKeyOf(const DIGlobalVariable *RHS) const {
     return Scope == RHS->getRawScope() && Name == RHS->getName() &&
            LinkageName == RHS->getLinkageName() && File == RHS->getRawFile() &&
            Line == RHS->getLine() && Type == RHS->getRawType() &&
@@ -727,7 +727,7 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDLocalVariable> {
+template <> struct MDNodeKeyImpl<DILocalVariable> {
   unsigned Tag;
   Metadata *Scope;
   StringRef Name;
@@ -741,12 +741,12 @@
                 unsigned Line, Metadata *Type, unsigned Arg, unsigned Flags)
       : Tag(Tag), Scope(Scope), Name(Name), File(File), Line(Line), Type(Type),
         Arg(Arg), Flags(Flags) {}
-  MDNodeKeyImpl(const MDLocalVariable *N)
+  MDNodeKeyImpl(const DILocalVariable *N)
       : Tag(N->getTag()), Scope(N->getRawScope()), Name(N->getName()),
         File(N->getRawFile()), Line(N->getLine()), Type(N->getRawType()),
         Arg(N->getArg()), Flags(N->getFlags()) {}
 
-  bool isKeyOf(const MDLocalVariable *RHS) const {
+  bool isKeyOf(const DILocalVariable *RHS) const {
     return Tag == RHS->getTag() && Scope == RHS->getRawScope() &&
            Name == RHS->getName() && File == RHS->getRawFile() &&
            Line == RHS->getLine() && Type == RHS->getRawType() &&
@@ -757,13 +757,13 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDExpression> {
+template <> struct MDNodeKeyImpl<DIExpression> {
   ArrayRef<uint64_t> Elements;
 
   MDNodeKeyImpl(ArrayRef<uint64_t> Elements) : Elements(Elements) {}
-  MDNodeKeyImpl(const MDExpression *N) : Elements(N->getElements()) {}
+  MDNodeKeyImpl(const DIExpression *N) : Elements(N->getElements()) {}
 
-  bool isKeyOf(const MDExpression *RHS) const {
+  bool isKeyOf(const DIExpression *RHS) const {
     return Elements == RHS->getElements();
   }
   unsigned getHashValue() const {
@@ -771,7 +771,7 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDObjCProperty> {
+template <> struct MDNodeKeyImpl<DIObjCProperty> {
   StringRef Name;
   Metadata *File;
   unsigned Line;
@@ -785,12 +785,12 @@
                 Metadata *Type)
       : Name(Name), File(File), Line(Line), GetterName(GetterName),
         SetterName(SetterName), Attributes(Attributes), Type(Type) {}
-  MDNodeKeyImpl(const MDObjCProperty *N)
+  MDNodeKeyImpl(const DIObjCProperty *N)
       : Name(N->getName()), File(N->getRawFile()), Line(N->getLine()),
         GetterName(N->getGetterName()), SetterName(N->getSetterName()),
         Attributes(N->getAttributes()), Type(N->getRawType()) {}
 
-  bool isKeyOf(const MDObjCProperty *RHS) const {
+  bool isKeyOf(const DIObjCProperty *RHS) const {
     return Name == RHS->getName() && File == RHS->getRawFile() &&
            Line == RHS->getLine() && GetterName == RHS->getGetterName() &&
            SetterName == RHS->getSetterName() &&
@@ -802,7 +802,7 @@
   }
 };
 
-template <> struct MDNodeKeyImpl<MDImportedEntity> {
+template <> struct MDNodeKeyImpl<DIImportedEntity> {
   unsigned Tag;
   Metadata *Scope;
   Metadata *Entity;
@@ -812,11 +812,11 @@
   MDNodeKeyImpl(unsigned Tag, Metadata *Scope, Metadata *Entity, unsigned Line,
                 StringRef Name)
       : Tag(Tag), Scope(Scope), Entity(Entity), Line(Line), Name(Name) {}
-  MDNodeKeyImpl(const MDImportedEntity *N)
+  MDNodeKeyImpl(const DIImportedEntity *N)
       : Tag(N->getTag()), Scope(N->getRawScope()), Entity(N->getRawEntity()),
         Line(N->getLine()), Name(N->getName()) {}
 
-  bool isKeyOf(const MDImportedEntity *RHS) const {
+  bool isKeyOf(const DIImportedEntity *RHS) const {
     return Tag == RHS->getTag() && Scope == RHS->getRawScope() &&
            Entity == RHS->getRawEntity() && Line == RHS->getLine() &&
            Name == RHS->getName();
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index afce3e2..3ccc48e 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -305,11 +305,11 @@
   template <class Ty> bool isValidMetadataArray(const MDTuple &N);
 #define HANDLE_SPECIALIZED_MDNODE_LEAF(CLASS) void visit##CLASS(const CLASS &N);
 #include "llvm/IR/Metadata.def"
-  void visitMDScope(const MDScope &N);
-  void visitMDDerivedTypeBase(const MDDerivedTypeBase &N);
-  void visitMDVariable(const MDVariable &N);
-  void visitMDLexicalBlockBase(const MDLexicalBlockBase &N);
-  void visitMDTemplateParameter(const MDTemplateParameter &N);
+  void visitDIScope(const DIScope &N);
+  void visitDIDerivedTypeBase(const DIDerivedTypeBase &N);
+  void visitDIVariable(const DIVariable &N);
+  void visitDILexicalBlockBase(const DILexicalBlockBase &N);
+  void visitDITemplateParameter(const DITemplateParameter &N);
 
   void visitTemplateParams(const MDNode &N, const Metadata &RawParams);
 
@@ -321,17 +321,17 @@
 
   /// \brief Check for a valid type reference.
   ///
-  /// Checks for subclasses of \a MDType, or \a isValidUUID().
+  /// Checks for subclasses of \a DIType, or \a isValidUUID().
   bool isTypeRef(const MDNode &N, const Metadata *MD);
 
   /// \brief Check for a valid scope reference.
   ///
-  /// Checks for subclasses of \a MDScope, or \a isValidUUID().
+  /// Checks for subclasses of \a DIScope, or \a isValidUUID().
   bool isScopeRef(const MDNode &N, const Metadata *MD);
 
   /// \brief Check for a valid debug info reference.
   ///
-  /// Checks for subclasses of \a DebugNode, or \a isValidUUID().
+  /// Checks for subclasses of \a DINode, or \a isValidUUID().
   bool isDIRef(const MDNode &N, const Metadata *MD);
 
   // InstVisitor overrides...
@@ -605,7 +605,7 @@
     MDNode *MD = NMD.getOperand(i);
 
     if (NMD.getName() == "llvm.dbg.cu") {
-      Assert(MD && isa<MDCompileUnit>(MD), "invalid compile unit", &NMD, MD);
+      Assert(MD && isa<DICompileUnit>(MD), "invalid compile unit", &NMD, MD);
     }
 
     if (!MD)
@@ -711,17 +711,17 @@
 
 /// \brief Check if a value can be a reference to a type.
 bool Verifier::isTypeRef(const MDNode &N, const Metadata *MD) {
-  return !MD || isValidUUID(N, MD) || isa<MDType>(MD);
+  return !MD || isValidUUID(N, MD) || isa<DIType>(MD);
 }
 
 /// \brief Check if a value can be a ScopeRef.
 bool Verifier::isScopeRef(const MDNode &N, const Metadata *MD) {
-  return !MD || isValidUUID(N, MD) || isa<MDScope>(MD);
+  return !MD || isValidUUID(N, MD) || isa<DIScope>(MD);
 }
 
 /// \brief Check if a value can be a debug info ref.
 bool Verifier::isDIRef(const MDNode &N, const Metadata *MD) {
-  return !MD || isValidUUID(N, MD) || isa<DebugNode>(MD);
+  return !MD || isValidUUID(N, MD) || isa<DINode>(MD);
 }
 
 template <class Ty>
@@ -748,40 +748,40 @@
   return isValidMetadataArrayImpl<Ty>(N, /* AllowNull */ true);
 }
 
-void Verifier::visitMDLocation(const MDLocation &N) {
-  Assert(N.getRawScope() && isa<MDLocalScope>(N.getRawScope()),
+void Verifier::visitDILocation(const DILocation &N) {
+  Assert(N.getRawScope() && isa<DILocalScope>(N.getRawScope()),
          "location requires a valid scope", &N, N.getRawScope());
   if (auto *IA = N.getRawInlinedAt())
-    Assert(isa<MDLocation>(IA), "inlined-at should be a location", &N, IA);
+    Assert(isa<DILocation>(IA), "inlined-at should be a location", &N, IA);
 }
 
-void Verifier::visitGenericDebugNode(const GenericDebugNode &N) {
+void Verifier::visitGenericDINode(const GenericDINode &N) {
   Assert(N.getTag(), "invalid tag", &N);
 }
 
-void Verifier::visitMDScope(const MDScope &N) {
+void Verifier::visitDIScope(const DIScope &N) {
   if (auto *F = N.getRawFile())
-    Assert(isa<MDFile>(F), "invalid file", &N, F);
+    Assert(isa<DIFile>(F), "invalid file", &N, F);
 }
 
-void Verifier::visitMDSubrange(const MDSubrange &N) {
+void Verifier::visitDISubrange(const DISubrange &N) {
   Assert(N.getTag() == dwarf::DW_TAG_subrange_type, "invalid tag", &N);
   Assert(N.getCount() >= -1, "invalid subrange count", &N);
 }
 
-void Verifier::visitMDEnumerator(const MDEnumerator &N) {
+void Verifier::visitDIEnumerator(const DIEnumerator &N) {
   Assert(N.getTag() == dwarf::DW_TAG_enumerator, "invalid tag", &N);
 }
 
-void Verifier::visitMDBasicType(const MDBasicType &N) {
+void Verifier::visitDIBasicType(const DIBasicType &N) {
   Assert(N.getTag() == dwarf::DW_TAG_base_type ||
              N.getTag() == dwarf::DW_TAG_unspecified_type,
          "invalid tag", &N);
 }
 
-void Verifier::visitMDDerivedTypeBase(const MDDerivedTypeBase &N) {
+void Verifier::visitDIDerivedTypeBase(const DIDerivedTypeBase &N) {
   // Common scope checks.
-  visitMDScope(N);
+  visitDIScope(N);
 
   Assert(isScopeRef(N, N.getScope()), "invalid scope", &N, N.getScope());
   Assert(isTypeRef(N, N.getBaseType()), "invalid base type", &N,
@@ -808,9 +808,9 @@
   }
 }
 
-void Verifier::visitMDDerivedType(const MDDerivedType &N) {
+void Verifier::visitDIDerivedType(const DIDerivedType &N) {
   // Common derived type checks.
-  visitMDDerivedTypeBase(N);
+  visitDIDerivedTypeBase(N);
 
   Assert(N.getTag() == dwarf::DW_TAG_typedef ||
              N.getTag() == dwarf::DW_TAG_pointer_type ||
@@ -831,22 +831,22 @@
 }
 
 static bool hasConflictingReferenceFlags(unsigned Flags) {
-  return (Flags & DebugNode::FlagLValueReference) &&
-         (Flags & DebugNode::FlagRValueReference);
+  return (Flags & DINode::FlagLValueReference) &&
+         (Flags & DINode::FlagRValueReference);
 }
 
 void Verifier::visitTemplateParams(const MDNode &N, const Metadata &RawParams) {
   auto *Params = dyn_cast<MDTuple>(&RawParams);
   Assert(Params, "invalid template params", &N, &RawParams);
   for (Metadata *Op : Params->operands()) {
-    Assert(Op && isa<MDTemplateParameter>(Op), "invalid template parameter", &N,
+    Assert(Op && isa<DITemplateParameter>(Op), "invalid template parameter", &N,
            Params, Op);
   }
 }
 
-void Verifier::visitMDCompositeType(const MDCompositeType &N) {
+void Verifier::visitDICompositeType(const DICompositeType &N) {
   // Common derived type checks.
-  visitMDDerivedTypeBase(N);
+  visitDIDerivedTypeBase(N);
 
   Assert(N.getTag() == dwarf::DW_TAG_array_type ||
              N.getTag() == dwarf::DW_TAG_structure_type ||
@@ -868,7 +868,7 @@
     visitTemplateParams(N, *Params);
 }
 
-void Verifier::visitMDSubroutineType(const MDSubroutineType &N) {
+void Verifier::visitDISubroutineType(const DISubroutineType &N) {
   Assert(N.getTag() == dwarf::DW_TAG_subroutine_type, "invalid tag", &N);
   if (auto *Types = N.getRawTypeArray()) {
     Assert(isa<MDTuple>(Types), "invalid composite elements", &N, Types);
@@ -880,24 +880,24 @@
          &N);
 }
 
-void Verifier::visitMDFile(const MDFile &N) {
+void Verifier::visitDIFile(const DIFile &N) {
   Assert(N.getTag() == dwarf::DW_TAG_file_type, "invalid tag", &N);
 }
 
-void Verifier::visitMDCompileUnit(const MDCompileUnit &N) {
+void Verifier::visitDICompileUnit(const DICompileUnit &N) {
   Assert(N.getTag() == dwarf::DW_TAG_compile_unit, "invalid tag", &N);
 
   // Don't bother verifying the compilation directory or producer string
   // as those could be empty.
-  Assert(N.getRawFile() && isa<MDFile>(N.getRawFile()),
-         "invalid file", &N, N.getRawFile());
+  Assert(N.getRawFile() && isa<DIFile>(N.getRawFile()), "invalid file", &N,
+         N.getRawFile());
   Assert(!N.getFile()->getFilename().empty(), "invalid filename", &N,
          N.getFile());
 
   if (auto *Array = N.getRawEnumTypes()) {
     Assert(isa<MDTuple>(Array), "invalid enum list", &N, Array);
     for (Metadata *Op : N.getEnumTypes()->operands()) {
-      auto *Enum = dyn_cast_or_null<MDCompositeType>(Op);
+      auto *Enum = dyn_cast_or_null<DICompositeType>(Op);
       Assert(Enum && Enum->getTag() == dwarf::DW_TAG_enumeration_type,
              "invalid enum type", &N, N.getEnumTypes(), Op);
     }
@@ -905,36 +905,36 @@
   if (auto *Array = N.getRawRetainedTypes()) {
     Assert(isa<MDTuple>(Array), "invalid retained type list", &N, Array);
     for (Metadata *Op : N.getRetainedTypes()->operands()) {
-      Assert(Op && isa<MDType>(Op), "invalid retained type", &N, Op);
+      Assert(Op && isa<DIType>(Op), "invalid retained type", &N, Op);
     }
   }
   if (auto *Array = N.getRawSubprograms()) {
     Assert(isa<MDTuple>(Array), "invalid subprogram list", &N, Array);
     for (Metadata *Op : N.getSubprograms()->operands()) {
-      Assert(Op && isa<MDSubprogram>(Op), "invalid subprogram ref", &N, Op);
+      Assert(Op && isa<DISubprogram>(Op), "invalid subprogram ref", &N, Op);
     }
   }
   if (auto *Array = N.getRawGlobalVariables()) {
     Assert(isa<MDTuple>(Array), "invalid global variable list", &N, Array);
     for (Metadata *Op : N.getGlobalVariables()->operands()) {
-      Assert(Op && isa<MDGlobalVariable>(Op), "invalid global variable ref", &N,
+      Assert(Op && isa<DIGlobalVariable>(Op), "invalid global variable ref", &N,
              Op);
     }
   }
   if (auto *Array = N.getRawImportedEntities()) {
     Assert(isa<MDTuple>(Array), "invalid imported entity list", &N, Array);
     for (Metadata *Op : N.getImportedEntities()->operands()) {
-      Assert(Op && isa<MDImportedEntity>(Op), "invalid imported entity ref", &N,
+      Assert(Op && isa<DIImportedEntity>(Op), "invalid imported entity ref", &N,
              Op);
     }
   }
 }
 
-void Verifier::visitMDSubprogram(const MDSubprogram &N) {
+void Verifier::visitDISubprogram(const DISubprogram &N) {
   Assert(N.getTag() == dwarf::DW_TAG_subprogram, "invalid tag", &N);
   Assert(isScopeRef(N, N.getRawScope()), "invalid scope", &N, N.getRawScope());
   if (auto *T = N.getRawType())
-    Assert(isa<MDSubroutineType>(T), "invalid subroutine type", &N, T);
+    Assert(isa<DISubroutineType>(T), "invalid subroutine type", &N, T);
   Assert(isTypeRef(N, N.getRawContainingType()), "invalid containing type", &N,
          N.getRawContainingType());
   if (auto *RawF = N.getRawFunction()) {
@@ -947,14 +947,14 @@
   if (auto *Params = N.getRawTemplateParams())
     visitTemplateParams(N, *Params);
   if (auto *S = N.getRawDeclaration()) {
-    Assert(isa<MDSubprogram>(S) && !cast<MDSubprogram>(S)->isDefinition(),
+    Assert(isa<DISubprogram>(S) && !cast<DISubprogram>(S)->isDefinition(),
            "invalid subprogram declaration", &N, S);
   }
   if (auto *RawVars = N.getRawVariables()) {
     auto *Vars = dyn_cast<MDTuple>(RawVars);
     Assert(Vars, "invalid variable list", &N, RawVars);
     for (Metadata *Op : Vars->operands()) {
-      Assert(Op && isa<MDLocalVariable>(Op), "invalid local variable", &N, Vars,
+      Assert(Op && isa<DILocalVariable>(Op), "invalid local variable", &N, Vars,
              Op);
     }
   }
@@ -973,20 +973,20 @@
   SmallPtrSet<const MDNode *, 32> Seen;
   for (auto &BB : *F)
     for (auto &I : BB) {
-      // Be careful about using MDLocation here since we might be dealing with
+      // Be careful about using DILocation here since we might be dealing with
       // broken code (this is the Verifier after all).
-      MDLocation *DL =
-          dyn_cast_or_null<MDLocation>(I.getDebugLoc().getAsMDNode());
+      DILocation *DL =
+          dyn_cast_or_null<DILocation>(I.getDebugLoc().getAsMDNode());
       if (!DL)
         continue;
       if (!Seen.insert(DL).second)
         continue;
 
-      MDLocalScope *Scope = DL->getInlinedAtScope();
+      DILocalScope *Scope = DL->getInlinedAtScope();
       if (Scope && !Seen.insert(Scope).second)
         continue;
 
-      MDSubprogram *SP = Scope ? Scope->getSubprogram() : nullptr;
+      DISubprogram *SP = Scope ? Scope->getSubprogram() : nullptr;
       if (SP && !Seen.insert(SP).second)
         continue;
 
@@ -997,43 +997,43 @@
     }
 }
 
-void Verifier::visitMDLexicalBlockBase(const MDLexicalBlockBase &N) {
+void Verifier::visitDILexicalBlockBase(const DILexicalBlockBase &N) {
   Assert(N.getTag() == dwarf::DW_TAG_lexical_block, "invalid tag", &N);
-  Assert(N.getRawScope() && isa<MDLocalScope>(N.getRawScope()),
+  Assert(N.getRawScope() && isa<DILocalScope>(N.getRawScope()),
          "invalid local scope", &N, N.getRawScope());
 }
 
-void Verifier::visitMDLexicalBlock(const MDLexicalBlock &N) {
-  visitMDLexicalBlockBase(N);
+void Verifier::visitDILexicalBlock(const DILexicalBlock &N) {
+  visitDILexicalBlockBase(N);
 
   Assert(N.getLine() || !N.getColumn(),
          "cannot have column info without line info", &N);
 }
 
-void Verifier::visitMDLexicalBlockFile(const MDLexicalBlockFile &N) {
-  visitMDLexicalBlockBase(N);
+void Verifier::visitDILexicalBlockFile(const DILexicalBlockFile &N) {
+  visitDILexicalBlockBase(N);
 }
 
-void Verifier::visitMDNamespace(const MDNamespace &N) {
+void Verifier::visitDINamespace(const DINamespace &N) {
   Assert(N.getTag() == dwarf::DW_TAG_namespace, "invalid tag", &N);
   if (auto *S = N.getRawScope())
-    Assert(isa<MDScope>(S), "invalid scope ref", &N, S);
+    Assert(isa<DIScope>(S), "invalid scope ref", &N, S);
 }
 
-void Verifier::visitMDTemplateParameter(const MDTemplateParameter &N) {
+void Verifier::visitDITemplateParameter(const DITemplateParameter &N) {
   Assert(isTypeRef(N, N.getType()), "invalid type ref", &N, N.getType());
 }
 
-void Verifier::visitMDTemplateTypeParameter(const MDTemplateTypeParameter &N) {
-  visitMDTemplateParameter(N);
+void Verifier::visitDITemplateTypeParameter(const DITemplateTypeParameter &N) {
+  visitDITemplateParameter(N);
 
   Assert(N.getTag() == dwarf::DW_TAG_template_type_parameter, "invalid tag",
          &N);
 }
 
-void Verifier::visitMDTemplateValueParameter(
-    const MDTemplateValueParameter &N) {
-  visitMDTemplateParameter(N);
+void Verifier::visitDITemplateValueParameter(
+    const DITemplateValueParameter &N) {
+  visitDITemplateParameter(N);
 
   Assert(N.getTag() == dwarf::DW_TAG_template_value_parameter ||
              N.getTag() == dwarf::DW_TAG_GNU_template_template_param ||
@@ -1041,17 +1041,17 @@
          "invalid tag", &N);
 }
 
-void Verifier::visitMDVariable(const MDVariable &N) {
+void Verifier::visitDIVariable(const DIVariable &N) {
   if (auto *S = N.getRawScope())
-    Assert(isa<MDScope>(S), "invalid scope", &N, S);
+    Assert(isa<DIScope>(S), "invalid scope", &N, S);
   Assert(isTypeRef(N, N.getRawType()), "invalid type ref", &N, N.getRawType());
   if (auto *F = N.getRawFile())
-    Assert(isa<MDFile>(F), "invalid file", &N, F);
+    Assert(isa<DIFile>(F), "invalid file", &N, F);
 }
 
-void Verifier::visitMDGlobalVariable(const MDGlobalVariable &N) {
+void Verifier::visitDIGlobalVariable(const DIGlobalVariable &N) {
   // Checks common to all variables.
-  visitMDVariable(N);
+  visitDIVariable(N);
 
   Assert(N.getTag() == dwarf::DW_TAG_variable, "invalid tag", &N);
   Assert(!N.getName().empty(), "missing global variable name", &N);
@@ -1061,40 +1061,40 @@
            "invalid global varaible ref", &N, V);
   }
   if (auto *Member = N.getRawStaticDataMemberDeclaration()) {
-    Assert(isa<MDDerivedType>(Member), "invalid static data member declaration",
+    Assert(isa<DIDerivedType>(Member), "invalid static data member declaration",
            &N, Member);
   }
 }
 
-void Verifier::visitMDLocalVariable(const MDLocalVariable &N) {
+void Verifier::visitDILocalVariable(const DILocalVariable &N) {
   // Checks common to all variables.
-  visitMDVariable(N);
+  visitDIVariable(N);
 
   Assert(N.getTag() == dwarf::DW_TAG_auto_variable ||
              N.getTag() == dwarf::DW_TAG_arg_variable,
          "invalid tag", &N);
-  Assert(N.getRawScope() && isa<MDLocalScope>(N.getRawScope()),
+  Assert(N.getRawScope() && isa<DILocalScope>(N.getRawScope()),
          "local variable requires a valid scope", &N, N.getRawScope());
 }
 
-void Verifier::visitMDExpression(const MDExpression &N) {
+void Verifier::visitDIExpression(const DIExpression &N) {
   Assert(N.isValid(), "invalid expression", &N);
 }
 
-void Verifier::visitMDObjCProperty(const MDObjCProperty &N) {
+void Verifier::visitDIObjCProperty(const DIObjCProperty &N) {
   Assert(N.getTag() == dwarf::DW_TAG_APPLE_property, "invalid tag", &N);
   if (auto *T = N.getRawType())
-    Assert(isa<MDType>(T), "invalid type ref", &N, T);
+    Assert(isa<DIType>(T), "invalid type ref", &N, T);
   if (auto *F = N.getRawFile())
-    Assert(isa<MDFile>(F), "invalid file", &N, F);
+    Assert(isa<DIFile>(F), "invalid file", &N, F);
 }
 
-void Verifier::visitMDImportedEntity(const MDImportedEntity &N) {
+void Verifier::visitDIImportedEntity(const DIImportedEntity &N) {
   Assert(N.getTag() == dwarf::DW_TAG_imported_module ||
              N.getTag() == dwarf::DW_TAG_imported_declaration,
          "invalid tag", &N);
   if (auto *S = N.getRawScope())
-    Assert(isa<MDScope>(S), "invalid scope for imported entity", &N, S);
+    Assert(isa<DIScope>(S), "invalid scope for imported entity", &N, S);
   Assert(isDIRef(N, N.getEntity()), "invalid imported entity", &N,
          N.getEntity());
 }
@@ -2904,7 +2904,7 @@
   }
 
   if (MDNode *N = I.getDebugLoc().getAsMDNode()) {
-    Assert(isa<MDLocation>(N), "invalid !dbg metadata attachment", &I, N);
+    Assert(isa<DILocation>(N), "invalid !dbg metadata attachment", &I, N);
     visitMDNode(*N);
   }
 
@@ -3373,18 +3373,18 @@
 ///
 /// This carefully grabs the subprogram from a local scope, avoiding the
 /// built-in assertions that would typically fire.
-static MDSubprogram *getSubprogram(Metadata *LocalScope) {
+static DISubprogram *getSubprogram(Metadata *LocalScope) {
   if (!LocalScope)
     return nullptr;
 
-  if (auto *SP = dyn_cast<MDSubprogram>(LocalScope))
+  if (auto *SP = dyn_cast<DISubprogram>(LocalScope))
     return SP;
 
-  if (auto *LB = dyn_cast<MDLexicalBlockBase>(LocalScope))
+  if (auto *LB = dyn_cast<DILexicalBlockBase>(LocalScope))
     return getSubprogram(LB->getRawScope());
 
   // Just return null; broken scope chains are checked elsewhere.
-  assert(!isa<MDLocalScope>(LocalScope) && "Unknown type of local scope");
+  assert(!isa<DILocalScope>(LocalScope) && "Unknown type of local scope");
   return nullptr;
 }
 
@@ -3394,29 +3394,29 @@
   Assert(isa<ValueAsMetadata>(MD) ||
              (isa<MDNode>(MD) && !cast<MDNode>(MD)->getNumOperands()),
          "invalid llvm.dbg." + Kind + " intrinsic address/value", &DII, MD);
-  Assert(isa<MDLocalVariable>(DII.getRawVariable()),
+  Assert(isa<DILocalVariable>(DII.getRawVariable()),
          "invalid llvm.dbg." + Kind + " intrinsic variable", &DII,
          DII.getRawVariable());
-  Assert(isa<MDExpression>(DII.getRawExpression()),
+  Assert(isa<DIExpression>(DII.getRawExpression()),
          "invalid llvm.dbg." + Kind + " intrinsic expression", &DII,
          DII.getRawExpression());
 
   // Ignore broken !dbg attachments; they're checked elsewhere.
   if (MDNode *N = DII.getDebugLoc().getAsMDNode())
-    if (!isa<MDLocation>(N))
+    if (!isa<DILocation>(N))
       return;
 
   BasicBlock *BB = DII.getParent();
   Function *F = BB ? BB->getParent() : nullptr;
 
   // The scopes for variables and !dbg attachments must agree.
-  MDLocalVariable *Var = DII.getVariable();
-  MDLocation *Loc = DII.getDebugLoc();
+  DILocalVariable *Var = DII.getVariable();
+  DILocation *Loc = DII.getDebugLoc();
   Assert(Loc, "llvm.dbg." + Kind + " intrinsic requires a !dbg attachment",
          &DII, BB, F);
 
-  MDSubprogram *VarSP = getSubprogram(Var->getRawScope());
-  MDSubprogram *LocSP = getSubprogram(Loc->getRawScope());
+  DISubprogram *VarSP = getSubprogram(Var->getRawScope());
+  DISubprogram *LocSP = getSubprogram(Loc->getRawScope());
   if (!VarSP || !LocSP)
     return; // Broken scope chains are checked elsewhere.
 
@@ -3427,16 +3427,16 @@
 }
 
 template <class MapTy>
-static uint64_t getVariableSize(const MDLocalVariable &V, const MapTy &Map) {
+static uint64_t getVariableSize(const DILocalVariable &V, const MapTy &Map) {
   // Be careful of broken types (checked elsewhere).
   const Metadata *RawType = V.getRawType();
   while (RawType) {
     // Try to get the size directly.
-    if (auto *T = dyn_cast<MDType>(RawType))
+    if (auto *T = dyn_cast<DIType>(RawType))
       if (uint64_t Size = T->getSizeInBits())
         return Size;
 
-    if (auto *DT = dyn_cast<MDDerivedType>(RawType)) {
+    if (auto *DT = dyn_cast<DIDerivedType>(RawType)) {
       // Look at the base type.
       RawType = DT->getRawBaseType();
       continue;
@@ -3459,15 +3459,15 @@
 template <class MapTy>
 void Verifier::verifyBitPieceExpression(const DbgInfoIntrinsic &I,
                                         const MapTy &TypeRefs) {
-  MDLocalVariable *V;
-  MDExpression *E;
+  DILocalVariable *V;
+  DIExpression *E;
   if (auto *DVI = dyn_cast<DbgValueInst>(&I)) {
-    V = dyn_cast_or_null<MDLocalVariable>(DVI->getRawVariable());
-    E = dyn_cast_or_null<MDExpression>(DVI->getRawExpression());
+    V = dyn_cast_or_null<DILocalVariable>(DVI->getRawVariable());
+    E = dyn_cast_or_null<DIExpression>(DVI->getRawExpression());
   } else {
     auto *DDI = cast<DbgDeclareInst>(&I);
-    V = dyn_cast_or_null<MDLocalVariable>(DDI->getRawVariable());
-    E = dyn_cast_or_null<MDExpression>(DDI->getRawExpression());
+    V = dyn_cast_or_null<DILocalVariable>(DDI->getRawVariable());
+    E = dyn_cast_or_null<DIExpression>(DDI->getRawExpression());
   }
 
   // We don't know whether this intrinsic verified correctly.
@@ -3503,11 +3503,11 @@
     return;
 
   // Visit all the compile units again to map the type references.
-  SmallDenseMap<const MDString *, const MDType *, 32> TypeRefs;
+  SmallDenseMap<const MDString *, const DIType *, 32> TypeRefs;
   for (auto *CU : CUs->operands())
-    if (auto Ts = cast<MDCompileUnit>(CU)->getRetainedTypes())
-      for (MDType *Op : Ts)
-        if (auto *T = dyn_cast<MDCompositeType>(Op))
+    if (auto Ts = cast<DICompileUnit>(CU)->getRetainedTypes())
+      for (DIType *Op : Ts)
+        if (auto *T = dyn_cast<DICompositeType>(Op))
           if (auto *S = T->getRawIdentifier()) {
             UnresolvedTypeRefs.erase(S);
             TypeRefs.insert(std::make_pair(S, T));
diff --git a/llvm/lib/Linker/LinkModules.cpp b/llvm/lib/Linker/LinkModules.cpp
index 34a353a..b0cf109 100644
--- a/llvm/lib/Linker/LinkModules.cpp
+++ b/llvm/lib/Linker/LinkModules.cpp
@@ -1288,10 +1288,10 @@
   if (!CompileUnits)
     return;
   for (unsigned I = 0, E = CompileUnits->getNumOperands(); I != E; ++I) {
-    auto *CU = cast<MDCompileUnit>(CompileUnits->getOperand(I));
+    auto *CU = cast<DICompileUnit>(CompileUnits->getOperand(I));
     assert(CU && "Expected valid compile unit");
 
-    for (MDSubprogram *SP : CU->getSubprograms()) {
+    for (DISubprogram *SP : CU->getSubprograms()) {
       if (!SP || !SP->getFunction() || !Functions.count(SP->getFunction()))
         continue;
 
diff --git a/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp b/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
index 4db8f21..8033422 100644
--- a/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
+++ b/llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
@@ -348,7 +348,7 @@
   assert(NOps == 4);
   OS << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
   // cast away const; DIetc do not take const operands for some reason.
-  OS << cast<MDLocalVariable>(MI->getOperand(NOps - 2).getMetadata())
+  OS << cast<DILocalVariable>(MI->getOperand(NOps - 2).getMetadata())
             ->getName();
   OS << " <- ";
   // Frame address.  Currently handles register +- offset only.
diff --git a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
index 85a4fa6..7c69bc5 100644
--- a/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
+++ b/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
@@ -129,7 +129,7 @@
   if (!curLoc)
     return;
 
-  auto *Scope = cast_or_null<MDScope>(curLoc.getScope());
+  auto *Scope = cast_or_null<DIScope>(curLoc.getScope());
   if (!Scope)
      return;
 
@@ -773,7 +773,7 @@
   DbgFinder.processModule(M);
 
   unsigned i = 1;
-  for (const MDCompileUnit *DIUnit : DbgFinder.compile_units()) {
+  for (const DICompileUnit *DIUnit : DbgFinder.compile_units()) {
     StringRef Filename = DIUnit->getFilename();
     StringRef Dirname = DIUnit->getDirectory();
     SmallString<128> FullPathName = Dirname;
@@ -788,7 +788,7 @@
     ++i;
   }
 
-  for (MDSubprogram *SP : DbgFinder.subprograms()) {
+  for (DISubprogram *SP : DbgFinder.subprograms()) {
     StringRef Filename = SP->getFilename();
     StringRef Dirname = SP->getDirectory();
     SmallString<128> FullPathName = Dirname;
diff --git a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
index 79e15bd..7b7672d 100644
--- a/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
+++ b/llvm/lib/Transforms/IPO/ArgumentPromotion.cpp
@@ -90,7 +90,7 @@
     bool doInitialization(CallGraph &CG) override;
     /// The maximum number of elements to expand, or 0 for unlimited.
     unsigned maxElements;
-    DenseMap<const Function *, MDSubprogram *> FunctionDIs;
+    DenseMap<const Function *, DISubprogram *> FunctionDIs;
   };
 }
 
@@ -706,7 +706,7 @@
   // Patch the pointer to LLVM function in debug info descriptor.
   auto DI = FunctionDIs.find(F);
   if (DI != FunctionDIs.end()) {
-    MDSubprogram *SP = DI->second;
+    DISubprogram *SP = DI->second;
     SP->replaceFunction(NF);
     // Ensure the map is updated so it can be reused on subsequent argument
     // promotions of the same function.
diff --git a/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
index 83dab6d..546c8f3 100644
--- a/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -127,7 +127,7 @@
     // As the code generation for module is finished (and DIBuilder is
     // finalized) we assume that subprogram descriptors won't be changed, and
     // they are stored in map for short duration anyway.
-    DenseMap<const Function *, MDSubprogram *> FunctionDIs;
+    DenseMap<const Function *, DISubprogram *> FunctionDIs;
 
   protected:
     // DAH uses this to specify a different ID.
@@ -303,7 +303,7 @@
   // Patch the pointer to LLVM function in debug info descriptor.
   auto DI = FunctionDIs.find(&Fn);
   if (DI != FunctionDIs.end()) {
-    MDSubprogram *SP = DI->second;
+    DISubprogram *SP = DI->second;
     SP->replaceFunction(NF);
     // Ensure the map is updated so it can be reused on non-varargs argument
     // eliminations of the same function.
diff --git a/llvm/lib/Transforms/IPO/StripSymbols.cpp b/llvm/lib/Transforms/IPO/StripSymbols.cpp
index bcead02..60c9573 100644
--- a/llvm/lib/Transforms/IPO/StripSymbols.cpp
+++ b/llvm/lib/Transforms/IPO/StripSymbols.cpp
@@ -305,10 +305,10 @@
   SmallVector<Metadata *, 64> LiveSubprograms;
   DenseSet<const MDNode *> VisitedSet;
 
-  for (MDCompileUnit *DIC : F.compile_units()) {
+  for (DICompileUnit *DIC : F.compile_units()) {
     // Create our live subprogram list.
     bool SubprogramChange = false;
-    for (MDSubprogram *DISP : DIC->getSubprograms()) {
+    for (DISubprogram *DISP : DIC->getSubprograms()) {
       // Make sure we visit each subprogram only once.
       if (!VisitedSet.insert(DISP).second)
         continue;
@@ -322,7 +322,7 @@
 
     // Create our live global variable list.
     bool GlobalVariableChange = false;
-    for (MDGlobalVariable *DIG : DIC->getGlobalVariables()) {
+    for (DIGlobalVariable *DIG : DIC->getGlobalVariables()) {
       // Make sure we only visit each global variable only once.
       if (!VisitedSet.insert(DIG).second)
         continue;
diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index 8d6d3ce..1f2f30b 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -250,8 +250,8 @@
 
   void parse(MDNode *MDN) {
     assert(MDN->getNumOperands() == 3);
-    MDString *MDFilename = cast<MDString>(MDN->getOperand(0));
-    Filename = MDFilename->getString();
+    MDString *DIFilename = cast<MDString>(MDN->getOperand(0));
+    Filename = DIFilename->getString();
     LineNo =
         mdconst::extract<ConstantInt>(MDN->getOperand(1))->getLimitedValue();
     ColumnNo =
diff --git a/llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
index 53e5d9d..1763c0f 100644
--- a/llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
@@ -248,7 +248,7 @@
   DFSanABIList ABIList;
   DenseMap<Value *, Function *> UnwrappedFnMap;
   AttributeSet ReadOnlyNoneAttrs;
-  DenseMap<const Function *, MDSubprogram *> FunctionDIs;
+  DenseMap<const Function *, DISubprogram *> FunctionDIs;
 
   Value *getShadowAddress(Value *Addr, Instruction *Pos);
   bool isInstrumented(const Function *F);
diff --git a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
index 292d869..231d421 100644
--- a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
@@ -126,7 +126,7 @@
     Function *insertFlush(ArrayRef<std::pair<GlobalVariable*, MDNode*> >);
     void insertIndirectCounterIncrement();
 
-    std::string mangleName(const MDCompileUnit *CU, const char *NewStem);
+    std::string mangleName(const DICompileUnit *CU, const char *NewStem);
 
     GCOVOptions Options;
 
@@ -149,7 +149,7 @@
   return new GCOVProfiler(Options);
 }
 
-static StringRef getFunctionName(const MDSubprogram *SP) {
+static StringRef getFunctionName(const DISubprogram *SP) {
   if (!SP->getLinkageName().empty())
     return SP->getLinkageName();
   return SP->getName();
@@ -309,7 +309,7 @@
   // object users can construct, the blocks and lines will be rooted here.
   class GCOVFunction : public GCOVRecord {
    public:
-     GCOVFunction(const MDSubprogram *SP, raw_ostream *os, uint32_t Ident,
+     GCOVFunction(const DISubprogram *SP, raw_ostream *os, uint32_t Ident,
                   bool UseCfgChecksum, bool ExitBlockBeforeBody)
          : SP(SP), Ident(Ident), UseCfgChecksum(UseCfgChecksum), CfgChecksum(0),
            ReturnBlock(1, os) {
@@ -411,7 +411,7 @@
     }
 
    private:
-     const MDSubprogram *SP;
+     const DISubprogram *SP;
     uint32_t Ident;
     uint32_t FuncChecksum;
     bool UseCfgChecksum;
@@ -421,7 +421,7 @@
   };
 }
 
-std::string GCOVProfiler::mangleName(const MDCompileUnit *CU,
+std::string GCOVProfiler::mangleName(const DICompileUnit *CU,
                                      const char *NewStem) {
   if (NamedMDNode *GCov = M->getNamedMetadata("llvm.gcov")) {
     for (int i = 0, e = GCov->getNumOperands(); i != e; ++i) {
@@ -488,7 +488,7 @@
     // this pass over the original .o's as they're produced, or run it after
     // LTO, we'll generate the same .gcno files.
 
-    auto *CU = cast<MDCompileUnit>(CU_Nodes->getOperand(i));
+    auto *CU = cast<DICompileUnit>(CU_Nodes->getOperand(i));
     std::error_code EC;
     raw_fd_ostream out(mangleName(CU, "gcno"), EC, sys::fs::F_None);
     std::string EdgeDestinations;
@@ -571,7 +571,7 @@
   bool Result = false;
   bool InsertIndCounterIncrCode = false;
   for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
-    auto *CU = cast<MDCompileUnit>(CU_Nodes->getOperand(i));
+    auto *CU = cast<DICompileUnit>(CU_Nodes->getOperand(i));
     SmallVector<std::pair<GlobalVariable *, MDNode *>, 8> CountersBySP;
     for (auto *SP : CU->getSubprograms()) {
       Function *F = SP->getFunction();
@@ -847,7 +847,7 @@
   NamedMDNode *CU_Nodes = M->getNamedMetadata("llvm.dbg.cu");
   if (CU_Nodes) {
     for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
-      auto *CU = cast<MDCompileUnit>(CU_Nodes->getOperand(i));
+      auto *CU = cast<DICompileUnit>(CU_Nodes->getOperand(i));
       std::string FilenameGcda = mangleName(CU, "gcda");
       uint32_t CfgChecksum = FileChecksums.empty() ? 0 : FileChecksums[i];
       Builder.CreateCall3(StartFile,
@@ -855,7 +855,7 @@
                           Builder.CreateGlobalStringPtr(ReversedVersion),
                           Builder.getInt32(CfgChecksum));
       for (unsigned j = 0, e = CountersBySP.size(); j != e; ++j) {
-        auto *SP = cast_or_null<MDSubprogram>(CountersBySP[j].second);
+        auto *SP = cast_or_null<DISubprogram>(CountersBySP[j].second);
         uint32_t FuncChecksum = Funcs.empty() ? 0 : Funcs[j]->getFuncChecksum();
         Builder.CreateCall5(
             EmitFunction, Builder.getInt32(j),
diff --git a/llvm/lib/Transforms/Scalar/SROA.cpp b/llvm/lib/Transforms/Scalar/SROA.cpp
index 66aed8d..3e062ba 100644
--- a/llvm/lib/Transforms/Scalar/SROA.cpp
+++ b/llvm/lib/Transforms/Scalar/SROA.cpp
@@ -1096,8 +1096,8 @@
     // Retain the debug information attached to the alloca for use when
     // rewriting loads and stores.
     if (auto *L = LocalAsMetadata::getIfExists(&AI)) {
-      if (auto *DebugNode = MetadataAsValue::getIfExists(AI.getContext(), L)) {
-        for (User *U : DebugNode->users())
+      if (auto *DINode = MetadataAsValue::getIfExists(AI.getContext(), L)) {
+        for (User *U : DINode->users())
           if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(U))
             DDIs.push_back(DDI);
           else if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(U))
diff --git a/llvm/lib/Transforms/Scalar/SampleProfile.cpp b/llvm/lib/Transforms/Scalar/SampleProfile.cpp
index f4936b5..594a7be 100644
--- a/llvm/lib/Transforms/Scalar/SampleProfile.cpp
+++ b/llvm/lib/Transforms/Scalar/SampleProfile.cpp
@@ -224,7 +224,7 @@
   if (Lineno < HeaderLineno)
     return 0;
 
-  const MDLocation *DIL = DLoc;
+  const DILocation *DIL = DLoc;
   int LOffset = Lineno - HeaderLineno;
   unsigned Discriminator = DIL->getDiscriminator();
   unsigned Weight = Samples->samplesAt(LOffset, Discriminator);
@@ -642,7 +642,7 @@
 /// \returns the line number where \p F is defined. If it returns 0,
 ///          it means that there is no debug information available for \p F.
 unsigned SampleProfileLoader::getFunctionLoc(Function &F) {
-  if (MDSubprogram *S = getDISubprogram(&F))
+  if (DISubprogram *S = getDISubprogram(&F))
     return S->getLine();
 
   // If could not find the start of \p F, emit a diagnostic to inform the user
diff --git a/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp b/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
index 5b47ef9..2ec1fd0 100644
--- a/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
+++ b/llvm/lib/Transforms/Scalar/ScalarReplAggregates.cpp
@@ -1060,8 +1060,8 @@
     // Remember which alloca we're promoting (for isInstInList).
     this->AI = AI;
     if (auto *L = LocalAsMetadata::getIfExists(AI)) {
-      if (auto *DebugNode = MetadataAsValue::getIfExists(AI->getContext(), L)) {
-        for (User *U : DebugNode->users())
+      if (auto *DINode = MetadataAsValue::getIfExists(AI->getContext(), L)) {
+        for (User *U : DINode->users())
           if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(U))
             DDIs.push_back(DDI);
           else if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(U))
diff --git a/llvm/lib/Transforms/Utils/AddDiscriminators.cpp b/llvm/lib/Transforms/Utils/AddDiscriminators.cpp
index 125aab2..e9f6239 100644
--- a/llvm/lib/Transforms/Utils/AddDiscriminators.cpp
+++ b/llvm/lib/Transforms/Utils/AddDiscriminators.cpp
@@ -174,14 +174,14 @@
   for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
     BasicBlock *B = I;
     TerminatorInst *Last = B->getTerminator();
-    const MDLocation *LastDIL = Last->getDebugLoc();
+    const DILocation *LastDIL = Last->getDebugLoc();
     if (!LastDIL)
       continue;
 
     for (unsigned I = 0; I < Last->getNumSuccessors(); ++I) {
       BasicBlock *Succ = Last->getSuccessor(I);
       Instruction *First = Succ->getFirstNonPHIOrDbgOrLifetime();
-      const MDLocation *FirstDIL = First->getDebugLoc();
+      const DILocation *FirstDIL = First->getDebugLoc();
       if (!FirstDIL)
         continue;
 
@@ -197,7 +197,7 @@
         auto *File = Builder.createFile(Filename, Scope->getDirectory());
 
         // FIXME: Calculate the discriminator here, based on local information,
-        // and delete MDLocation::computeNewDiscriminator().  The current
+        // and delete DILocation::computeNewDiscriminator().  The current
         // solution gives different results depending on other modules in the
         // same context.  All we really need is to discriminate between
         // FirstDIL and LastDIL -- a local map would suffice.
@@ -205,7 +205,7 @@
         auto *NewScope =
             Builder.createLexicalBlockFile(Scope, File, Discriminator);
         auto *NewDIL =
-            MDLocation::get(Ctx, FirstDIL->getLine(), FirstDIL->getColumn(),
+            DILocation::get(Ctx, FirstDIL->getLine(), FirstDIL->getColumn(),
                             NewScope, FirstDIL->getInlinedAt());
         DebugLoc newDebugLoc = NewDIL;
 
diff --git a/llvm/lib/Transforms/Utils/CloneFunction.cpp b/llvm/lib/Transforms/Utils/CloneFunction.cpp
index a9f476a..4f8d1df 100644
--- a/llvm/lib/Transforms/Utils/CloneFunction.cpp
+++ b/llvm/lib/Transforms/Utils/CloneFunction.cpp
@@ -155,9 +155,9 @@
 }
 
 // Find the MDNode which corresponds to the subprogram data that described F.
-static MDSubprogram *FindSubprogram(const Function *F,
+static DISubprogram *FindSubprogram(const Function *F,
                                     DebugInfoFinder &Finder) {
-  for (MDSubprogram *Subprogram : Finder.subprograms()) {
+  for (DISubprogram *Subprogram : Finder.subprograms()) {
     if (Subprogram->describes(F))
       return Subprogram;
   }
@@ -166,7 +166,7 @@
 
 // Add an operand to an existing MDNode. The new operand will be added at the
 // back of the operand list.
-static void AddOperand(MDCompileUnit *CU, MDSubprogramArray SPs,
+static void AddOperand(DICompileUnit *CU, DISubprogramArray SPs,
                        Metadata *NewSP) {
   SmallVector<Metadata *, 16> NewSPs;
   NewSPs.reserve(SPs.size() + 1);
@@ -183,14 +183,14 @@
   DebugInfoFinder Finder;
   Finder.processModule(*OldFunc->getParent());
 
-  const MDSubprogram *OldSubprogramMDNode = FindSubprogram(OldFunc, Finder);
+  const DISubprogram *OldSubprogramMDNode = FindSubprogram(OldFunc, Finder);
   if (!OldSubprogramMDNode) return;
 
   // Ensure that OldFunc appears in the map.
   // (if it's already there it must point to NewFunc anyway)
   VMap[OldFunc] = NewFunc;
   auto *NewSubprogram =
-      cast<MDSubprogram>(MapMetadata(OldSubprogramMDNode, VMap));
+      cast<DISubprogram>(MapMetadata(OldSubprogramMDNode, VMap));
 
   for (auto *CU : Finder.compile_units()) {
     auto Subprograms = CU->getSubprograms();
diff --git a/llvm/lib/Transforms/Utils/InlineFunction.cpp b/llvm/lib/Transforms/Utils/InlineFunction.cpp
index 169ebcf..97bfae1 100644
--- a/llvm/lib/Transforms/Utils/InlineFunction.cpp
+++ b/llvm/lib/Transforms/Utils/InlineFunction.cpp
@@ -830,17 +830,16 @@
 /// Rebuild the entire inlined-at chain for this instruction so that the top of
 /// the chain now is inlined-at the new call site.
 static DebugLoc
-updateInlinedAtInfo(DebugLoc DL, MDLocation *InlinedAtNode,
-                    LLVMContext &Ctx,
-                    DenseMap<const MDLocation *, MDLocation *> &IANodes) {
-  SmallVector<MDLocation*, 3> InlinedAtLocations;
-  MDLocation *Last = InlinedAtNode;
-  MDLocation *CurInlinedAt = DL;
+updateInlinedAtInfo(DebugLoc DL, DILocation *InlinedAtNode, LLVMContext &Ctx,
+                    DenseMap<const DILocation *, DILocation *> &IANodes) {
+  SmallVector<DILocation *, 3> InlinedAtLocations;
+  DILocation *Last = InlinedAtNode;
+  DILocation *CurInlinedAt = DL;
 
   // Gather all the inlined-at nodes
-  while (MDLocation *IA = CurInlinedAt->getInlinedAt()) {
+  while (DILocation *IA = CurInlinedAt->getInlinedAt()) {
     // Skip any we've already built nodes for
-    if (MDLocation *Found = IANodes[IA]) {
+    if (DILocation *Found = IANodes[IA]) {
       Last = Found;
       break;
     }
@@ -854,8 +853,8 @@
   // map of already-constructed inlined-at nodes.
   for (auto I = InlinedAtLocations.rbegin(), E = InlinedAtLocations.rend();
        I != E; ++I) {
-    const MDLocation *MD = *I;
-    Last = IANodes[MD] = MDLocation::getDistinct(
+    const DILocation *MD = *I;
+    Last = IANodes[MD] = DILocation::getDistinct(
         Ctx, MD->getLine(), MD->getColumn(), MD->getScope(), Last);
   }
 
@@ -873,18 +872,18 @@
     return;
 
   auto &Ctx = Fn->getContext();
-  MDLocation *InlinedAtNode = TheCallDL;
+  DILocation *InlinedAtNode = TheCallDL;
 
   // Create a unique call site, not to be confused with any other call from the
   // same location.
-  InlinedAtNode = MDLocation::getDistinct(
+  InlinedAtNode = DILocation::getDistinct(
       Ctx, InlinedAtNode->getLine(), InlinedAtNode->getColumn(),
       InlinedAtNode->getScope(), InlinedAtNode->getInlinedAt());
 
   // Cache the inlined-at nodes as they're built so they are reused, without
   // this every instruction's inlined-at chain would become distinct from each
   // other.
-  DenseMap<const MDLocation *, MDLocation *> IANodes;
+  DenseMap<const DILocation *, DILocation *> IANodes;
 
   for (; FI != Fn->end(); ++FI) {
     for (BasicBlock::iterator BI = FI->begin(), BE = FI->end();
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index 492dc07..4d40ba8 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -978,7 +978,7 @@
 ///
 
 /// See if there is a dbg.value intrinsic for DIVar before I.
-static bool LdStHasDebugValue(const MDLocalVariable *DIVar, Instruction *I) {
+static bool LdStHasDebugValue(const DILocalVariable *DIVar, Instruction *I) {
   // Since we can't guarantee that the original dbg.declare instrinsic
   // is removed by LowerDbgDeclare(), we need to make sure that we are
   // not inserting the same dbg.value intrinsic over and over.