[DXIL] Adding support to RootSignatureFlags in obj2yaml

llvm/include/llvm/BinaryFormat/DXContainer.h

@@ -63,6 +63,15 @@ struct ShaderHash {
   void swapBytes() { sys::swapByteOrder(Flags); }
 };
 
+struct RootSignatureDesc {
+  uint32_t Version;
+  uint32_t Flags;
+  void swapBytes() { 
+    sys::swapByteOrder(Version);
+    sys::swapByteOrder(Flags); 
+  }
+};
+
 struct ContainerVersion {
   uint16_t Major;
   uint16_t Minor;

llvm/include/llvm/BinaryFormat/DXContainerConstants.def

@@ -4,6 +4,7 @@ CONTAINER_PART(DXIL)
 CONTAINER_PART(SFI0)
 CONTAINER_PART(HASH)
 CONTAINER_PART(PSV0)
+CONTAINER_PART(RTS0)
 CONTAINER_PART(ISG1)
 CONTAINER_PART(OSG1)
 CONTAINER_PART(PSG1)

llvm/include/llvm/Object/DXContainer.h

@@ -287,6 +287,7 @@ class DXContainer {
   std::optional<uint64_t> ShaderFeatureFlags;
   std::optional<dxbc::ShaderHash> Hash;
   std::optional<DirectX::PSVRuntimeInfo> PSVInfo;
+  std::optional<dxbc::RootSignatureDesc> RootSignature;
   DirectX::Signature InputSignature;
   DirectX::Signature OutputSignature;
   DirectX::Signature PatchConstantSignature;
@@ -296,6 +297,7 @@ class DXContainer {
   Error parseDXILHeader(StringRef Part);
   Error parseShaderFeatureFlags(StringRef Part);
   Error parseHash(StringRef Part);
+  Error parseRootSignature(StringRef Part);
   Error parsePSVInfo(StringRef Part);
   Error parseSignature(StringRef Part, DirectX::Signature &Array);
   friend class PartIterator;
@@ -382,6 +384,11 @@ class DXContainer {
 
   std::optional<dxbc::ShaderHash> getShaderHash() const { return Hash; }
 
+  std::optional<dxbc::RootSignatureDesc>
+  getRootSignature() const {
+    return RootSignature;
+  }
+
   const std::optional<DirectX::PSVRuntimeInfo> &getPSVInfo() const {
     return PSVInfo;
   };

llvm/include/llvm/ObjectYAML/DXContainerYAML.h

@@ -72,6 +72,16 @@ struct ShaderHash {
   std::vector<llvm::yaml::Hex8> Digest;
 };
 
+
+
+struct RootSignatureDesc {
+  RootSignatureDesc() = default;
+  RootSignatureDesc(const dxbc::RootSignatureDesc &Data);
+
+  uint32_t Version;
+  uint32_t Flags;
+};
+
 using ResourceFlags = dxbc::PSV::ResourceFlags;
 using ResourceBindInfo = dxbc::PSV::v2::ResourceBindInfo;
 
@@ -159,6 +169,7 @@ struct Part {
   std::optional<ShaderHash> Hash;
   std::optional<PSVInfo> Info;
   std::optional<DXContainerYAML::Signature> Signature;
+  std::optional<DXContainerYAML::RootSignatureDesc> RootSignature;
 };
 
 struct Object {
@@ -241,6 +252,11 @@ template <> struct MappingTraits<DXContainerYAML::Signature> {
   static void mapping(IO &IO, llvm::DXContainerYAML::Signature &El);
 };
 
+template <> struct MappingTraits<DXContainerYAML::RootSignatureDesc> {
+  static void mapping(IO &IO,
+                      DXContainerYAML::RootSignatureDesc &RootSignature);
+};
+
 } // namespace yaml
 
 } // namespace llvm

llvm/lib/Object/DXContainer.cpp

@@ -92,6 +92,14 @@ Error DXContainer::parseHash(StringRef Part) {
   return Error::success();
 }
 
+Error DXContainer::parseRootSignature(StringRef Part) {
+  dxbc::RootSignatureDesc Desc;
+  if (Error Err = readStruct(Part, Part.begin(), Desc))
+    return Err;
+  RootSignature = Desc;
+  return Error::success();
+}
+
 Error DXContainer::parsePSVInfo(StringRef Part) {
   if (PSVInfo)
     return parseFailed("More than one PSV0 part is present in the file");
@@ -192,6 +200,11 @@ Error DXContainer::parsePartOffsets() {
         return Err;
       break;
     case dxbc::PartType::Unknown:
+      break;
+    case dxbc::PartType::RTS0:
+      if (Error Err = parseRootSignature(PartData))
+        return Err;
+
       break;
     }
   }

llvm/lib/ObjectYAML/DXContainerEmitter.cpp

@@ -261,6 +261,14 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
     }
     case dxbc::PartType::Unknown:
       break; // Skip any handling for unrecognized parts.
+    case dxbc::PartType::RTS0:
+      if (!P.RootSignature.has_value())
+        continue;
+     dxbc::RootSignatureDesc RS = {P.RootSignature->Version, P.RootSignature->Flags};
+      if (sys::IsBigEndianHost)
+        RS.swapBytes();
+      OS.write(reinterpret_cast<char *>(&RS), sizeof(dxbc::RootSignatureDesc));
+      break;
     }
     uint64_t BytesWritten = OS.tell() - DataStart;
     RollingOffset += BytesWritten;

llvm/lib/ObjectYAML/DXContainerYAML.cpp

@@ -45,6 +45,10 @@ DXContainerYAML::ShaderHash::ShaderHash(const dxbc::ShaderHash &Data)
   memcpy(Digest.data(), &Data.Digest[0], 16);
 }
 
+DXContainerYAML::RootSignatureDesc::RootSignatureDesc(const dxbc::RootSignatureDesc &Data)
+    : Version(Data.Version), Flags(Data.Flags) {
+}
+
 DXContainerYAML::PSVInfo::PSVInfo() : Version(0) {
   memset(&Info, 0, sizeof(Info));
 }
@@ -188,6 +192,12 @@ void MappingTraits<DXContainerYAML::Signature>::mapping(
   IO.mapRequired("Parameters", S.Parameters);
 }
 
+void MappingTraits<DXContainerYAML::RootSignatureDesc>::mapping(
+    IO &IO, DXContainerYAML::RootSignatureDesc &S) {
+  IO.mapRequired("Version", S.Version);
+  IO.mapRequired("Flags", S.Flags);
+}
+
 void MappingTraits<DXContainerYAML::Part>::mapping(IO &IO,
                                                    DXContainerYAML::Part &P) {
   IO.mapRequired("Name", P.Name);
@@ -197,6 +207,7 @@ void MappingTraits<DXContainerYAML::Part>::mapping(IO &IO,
   IO.mapOptional("Hash", P.Hash);
   IO.mapOptional("PSVInfo", P.Info);
   IO.mapOptional("Signature", P.Signature);
+  IO.mapOptional("RootSignature", P.RootSignature);
 }
 
 void MappingTraits<DXContainerYAML::Object>::mapping(