[llvm] [DXIL] Consume Metadata Analysis information in passes (PR #108034)

[S. Bharadwaj Yadavalli via llvm-commits]

================
@@ -7,26 +7,62 @@
 //===----------------------------------------------------------------------===//
 
 #include "DXILTranslateMetadata.h"
-#include "DXILMetadata.h"
 #include "DXILResource.h"
 #include "DXILResourceAnalysis.h"
 #include "DXILShaderFlags.h"
 #include "DirectX.h"
-#include "llvm/ADT/StringSet.h"
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/Analysis/DXILMetadataAnalysis.h"
 #include "llvm/Analysis/DXILResource.h"
 #include "llvm/IR/Constants.h"
+#include "llvm/IR/DiagnosticInfo.h"
+#include "llvm/IR/DiagnosticPrinter.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Metadata.h"
 #include "llvm/IR/Module.h"
 #include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
+#include "llvm/Support/VersionTuple.h"
 #include "llvm/TargetParser/Triple.h"
+#include <cstdint>
 
 using namespace llvm;
 using namespace llvm::dxil;
 
-static void emitResourceMetadata(Module &M, const DXILResourceMap &DRM,
-                                 const dxil::Resources &MDResources) {
+/// A simple Wrapper DiagnosticInfo that generates Module-level diagnostic
+class DiagnosticInfoModuleFormat : public DiagnosticInfo {
+private:
+  Twine Msg;
+  const Module &Mod;
+
+public:
+  /// \p M is the module for which the diagnostic is being emitted. \p Msg is
+  /// the message to show. Note that this class does not copy this message, so
+  /// this reference must be valid for the whole life time of the diagnostic.
+  DiagnosticInfoModuleFormat(const Module &M, const Twine &Msg,
+                             DiagnosticSeverity Severity = DS_Error)
+      : DiagnosticInfo(DK_Unsupported, Severity), Msg(Msg), Mod(M) {}
+
+  static bool classof(const DiagnosticInfo *DI) {
+    return DI->getKind() == DK_Unsupported;
+  }
+
+  const Twine &getMessage() const { return Msg; }
----------------
bharadwajy wrote:

> If I delete `classof` and `getMessage` this code still compiles. Are they really needed?

They are not currently used. The class was created following the way various derived classes of `DiagnosticInfo` in `DiagnosticInfo.h` - expecting that these methods may be of use if/when this diagnostic is used more. Deleted for now.

https://github.com/llvm/llvm-project/pull/108034