[clang] [HLSL] Apply resource attributes to the resource type rather than the handle member (PR #107160)

[Justin Bogner via cfe-commits]

================
@@ -559,46 +563,123 @@ void SemaHLSL::handleShaderAttr(Decl *D, const ParsedAttr &AL) {
     D->addAttr(NewAttr);
 }
 
-void SemaHLSL::handleResourceClassAttr(Decl *D, const ParsedAttr &AL) {
-  if (!AL.isArgIdent(0)) {
-    Diag(AL.getLoc(), diag::err_attribute_argument_type)
-        << AL << AANT_ArgumentIdentifier;
-    return;
-  }
+bool clang::CreateHLSLAttributedResourceType(Sema &S, QualType Wrapped,
+                                             ArrayRef<const Attr *> AttrList,
+                                             QualType &ResType) {
+  assert(AttrList.size() && "expected list of resource attributes");
 
-  IdentifierLoc *Loc = AL.getArgAsIdent(0);
-  StringRef Identifier = Loc->Ident->getName();
-  SourceLocation ArgLoc = Loc->Loc;
+  QualType Contained = QualType();
+  HLSLAttributedResourceType::Attributes ResAttrs = {};
 
-  // Validate.
-  llvm::dxil::ResourceClass RC;
-  if (!HLSLResourceClassAttr::ConvertStrToResourceClass(Identifier, RC)) {
-    Diag(ArgLoc, diag::warn_attribute_type_not_supported)
-        << "ResourceClass" << Identifier;
-    return;
+  bool HasResourceClass = false;
+  for (const Attr *A : AttrList) {
+    if (!A)
+      continue;
+    switch (A->getKind()) {
+    case attr::HLSLResourceClass: {
+      llvm::dxil::ResourceClass RC =
+          dyn_cast<HLSLResourceClassAttr>(A)->getResourceClass();
+      if (!HasResourceClass) {
+        ResAttrs.ResourceClass = RC;
+        HasResourceClass = true;
+      } else {
+        S.Diag(A->getLocation(), ResAttrs.ResourceClass == RC
+                                     ? diag::warn_duplicate_attribute_exact
+                                     : diag::warn_duplicate_attribute)
+            << A;
+        return false;
+      }
----------------
bogner wrote:

Checking the positive condition is generally more understandable than the negative. Also, since the diagnostic branch returns early you don't need the else that way:
```suggestion
      if (HasResourceClass) {
        S.Diag(A->getLocation(), ResAttrs.ResourceClass == RC
                                     ? diag::warn_duplicate_attribute_exact
                                     : diag::warn_duplicate_attribute)
            << A;
        return false;
      }
      ResAttrs.ResourceClass = RC;
      HasResourceClass = true;
```

https://github.com/llvm/llvm-project/pull/107160