[clang] [llvm] [HLSL][RootSignature] Metadata generation of RootFlags, RootConstants, RootDescriptors (PR #142010)

[Finn Plummer via cfe-commits]

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@@ -187,6 +193,46 @@ MDNode *MetadataBuilder::BuildRootSignature() {
   return MDNode::get(Ctx, GeneratedMetadata);
 }
 
+MDNode *MetadataBuilder::BuildRootFlags(const RootFlags &Flags) {
+  IRBuilder<> Builder(Ctx);
+  return MDNode::get(Ctx, {
+                              MDString::get(Ctx, "RootFlags"),
+                              ConstantAsMetadata::get(
+                                  Builder.getInt32(llvm::to_underlying(Flags))),
+                          });
+}
+
+MDNode *MetadataBuilder::BuildRootConstants(const RootConstants &Constants) {
+  IRBuilder<> Builder(Ctx);
+  return MDNode::get(
+      Ctx, {
+               MDString::get(Ctx, "RootConstants"),
+               ConstantAsMetadata::get(
+                   Builder.getInt32(llvm::to_underlying(Constants.Visibility))),
+               ConstantAsMetadata::get(Builder.getInt32(Constants.Reg.Number)),
+               ConstantAsMetadata::get(Builder.getInt32(Constants.Space)),
+               ConstantAsMetadata::get(
+                   Builder.getInt32(Constants.Num32BitConstants)),
+           });
+}
+
+MDNode *MetadataBuilder::BuildRootDescriptor(const RootDescriptor &Descriptor) {
+  IRBuilder<> Builder(Ctx);
+  std::string Name;
+  llvm::raw_string_ostream OS(Name);
+  OS << "Root" << ClauseType(llvm::to_underlying(Descriptor.Type));
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inbelic wrote:

Sounds good. I have a note for a clean-up to do define the stringifying functions for the enums. Further, the pattern used here was propagated from descriptor tables, so I will update the other uses accordingly.

https://github.com/llvm/llvm-project/pull/142010