diff --git a/llvm/include/llvm/ADT/Triple.h b/llvm/include/llvm/ADT/Triple.h
--- a/llvm/include/llvm/ADT/Triple.h
+++ b/llvm/include/llvm/ADT/Triple.h
@@ -260,6 +260,7 @@
     MachO,
     Wasm,
     XCOFF,
+    DXContainer,
   };
 
 private:
diff --git a/llvm/include/llvm/MC/MCContext.h b/llvm/include/llvm/MC/MCContext.h
--- a/llvm/include/llvm/MC/MCContext.h
+++ b/llvm/include/llvm/MC/MCContext.h
@@ -76,7 +76,15 @@
   using DiagHandlerTy =
       std::function<void(const SMDiagnostic &, bool, const SourceMgr &,
                          std::vector<const MDNode *> &)>;
-  enum Environment { IsMachO, IsELF, IsGOFF, IsCOFF, IsWasm, IsXCOFF };
+  enum Environment {
+    IsMachO,
+    IsELF,
+    IsGOFF,
+    IsCOFF,
+    IsWasm,
+    IsXCOFF,
+    IsDXContainer
+  };
 
 private:
   Environment Env;
diff --git a/llvm/include/llvm/MC/TargetRegistry.h b/llvm/include/llvm/MC/TargetRegistry.h
--- a/llvm/include/llvm/MC/TargetRegistry.h
+++ b/llvm/include/llvm/MC/TargetRegistry.h
@@ -530,6 +530,8 @@
     switch (T.getObjectFormat()) {
     case Triple::UnknownObjectFormat:
       llvm_unreachable("Unknown object format");
+    case Triple::DXContainer:
+      llvm_unreachable("DXContainer is unsupported through MC");
     case Triple::COFF:
       assert(T.isOSWindows() && "only Windows COFF is supported");
       S = COFFStreamerCtorFn(Ctx, std::move(TAB), std::move(OW),
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -4870,6 +4870,9 @@
   case Triple::XCOFF:
     llvm_unreachable("XCOFF is not yet implemented");
     break;
+  case Triple::DXContainer:
+    llvm_unreachable("DXContainer is not yet implemented");
+    break;
   }
   llvm_unreachable("Unimplemented ObjectFormatType");
 }
@@ -4889,6 +4892,9 @@
   case Triple::XCOFF:
     llvm_unreachable("XCOFF is not yet implemented");
     break;
+  case Triple::DXContainer:
+    llvm_unreachable("DXC is not yet implemented");
+    break;
   }
   llvm_unreachable("Unimplemented ObjectFormatType");
 }
diff --git a/llvm/lib/MC/MCContext.cpp b/llvm/lib/MC/MCContext.cpp
--- a/llvm/lib/MC/MCContext.cpp
+++ b/llvm/lib/MC/MCContext.cpp
@@ -107,6 +107,9 @@
   case Triple::GOFF:
     Env = IsGOFF;
     break;
+  case Triple::DXContainer:
+    Env = IsDXContainer;
+    break;
   case Triple::UnknownObjectFormat:
     report_fatal_error("Cannot initialize MC for unknown object file format.");
     break;
@@ -248,6 +251,8 @@
     return new (Name, *this) MCSymbolWasm(Name, IsTemporary);
   case MCContext::IsXCOFF:
     return createXCOFFSymbolImpl(Name, IsTemporary);
+  case MCContext::IsDXContainer:
+    break;
   }
   return new (Name, *this) MCSymbol(MCSymbol::SymbolKindUnset, Name,
                                     IsTemporary);
diff --git a/llvm/lib/MC/MCObjectFileInfo.cpp b/llvm/lib/MC/MCObjectFileInfo.cpp
--- a/llvm/lib/MC/MCObjectFileInfo.cpp
+++ b/llvm/lib/MC/MCObjectFileInfo.cpp
@@ -1038,6 +1038,8 @@
   case MCContext::IsXCOFF:
     initXCOFFMCObjectFileInfo(TheTriple);
     break;
+  case MCContext::IsDXContainer:
+    break;
   }
 }
 
@@ -1054,6 +1056,7 @@
   case Triple::COFF:
   case Triple::GOFF:
   case Triple::XCOFF:
+  case Triple::DXContainer:
   case Triple::UnknownObjectFormat:
     report_fatal_error("Cannot get DWARF comdat section for this object file "
                        "format: not implemented.");
diff --git a/llvm/lib/MC/MCParser/AsmParser.cpp b/llvm/lib/MC/MCParser/AsmParser.cpp
--- a/llvm/lib/MC/MCParser/AsmParser.cpp
+++ b/llvm/lib/MC/MCParser/AsmParser.cpp
@@ -798,6 +798,9 @@
   case MCContext::IsXCOFF:
     PlatformParser.reset(createXCOFFAsmParser());
     break;
+  case MCContext::IsDXContainer:
+    llvm_unreachable("DXContainer is not supported yet");
+    break;
   }
 
   PlatformParser->Initialize(*this);
diff --git a/llvm/lib/Support/Triple.cpp b/llvm/lib/Support/Triple.cpp
--- a/llvm/lib/Support/Triple.cpp
+++ b/llvm/lib/Support/Triple.cpp
@@ -731,6 +731,7 @@
   case Triple::MachO: return "macho";
   case Triple::Wasm:  return "wasm";
   case Triple::XCOFF: return "xcoff";
+  case Triple::DXContainer:  return "dxcontainer";
   }
   llvm_unreachable("unknown object format type");
 }
@@ -818,7 +819,7 @@
     return Triple::UnknownObjectFormat;
 
   case Triple::dxil:
-    return Triple::UnknownObjectFormat;
+    return Triple::DXContainer;
   }
   llvm_unreachable("unknown architecture");
 }
diff --git a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
--- a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -6380,6 +6380,7 @@
     break;
   case MCContext::IsGOFF:
   case MCContext::IsXCOFF:
+  case MCContext::IsDXContainer:
     llvm_unreachable("unexpected object format");
     break;
   }
diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -2106,6 +2106,7 @@
   case Triple::Wasm:
   case Triple::GOFF:
   case Triple::XCOFF:
+  case Triple::DXContainer:
     report_fatal_error(
         "ModuleAddressSanitizer not implemented for object file format");
   case Triple::UnknownObjectFormat:
diff --git a/llvm/unittests/ADT/TripleTest.cpp b/llvm/unittests/ADT/TripleTest.cpp
--- a/llvm/unittests/ADT/TripleTest.cpp
+++ b/llvm/unittests/ADT/TripleTest.cpp
@@ -1646,6 +1646,8 @@
   Triple CygwinNormalized(Triple::normalize("i686-pc-cygwin-elf"));
   EXPECT_EQ(Triple::ELF, CygwinNormalized.getObjectFormat());
 
+  EXPECT_EQ(Triple::DXContainer, Triple("dxil-unknown-shadermodel").getObjectFormat());
+
   Triple T = Triple("");
   T.setObjectFormat(Triple::ELF);
   EXPECT_EQ(Triple::ELF, T.getObjectFormat());