[clang] Implement resource binding type prefix mismatch diagnostic infrastructure (PR #97103)

[Joshua Batista via cfe-commits]

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@@ -459,7 +468,407 @@ void SemaHLSL::handleResourceClassAttr(Decl *D, const ParsedAttr &AL) {
   D->addAttr(HLSLResourceClassAttr::Create(getASTContext(), RC, ArgLoc));
 }
 
-void SemaHLSL::handleResourceBindingAttr(Decl *D, const ParsedAttr &AL) {
+struct RegisterBindingFlags {
+  bool Resource = false;
+  bool UDT = false;
+  bool Other = false;
+  bool Basic = false;
+
+  bool SRV = false;
+  bool UAV = false;
+  bool CBV = false;
+  bool Sampler = false;
+
+  bool ContainsNumeric = false;
+  bool DefaultGlobals = false;
+};
+
+static bool isDeclaredWithinCOrTBuffer(const Decl *TheDecl) {
+  if (!TheDecl)
+    return false;
+
+  // Traverse up the parent contexts
+  const DeclContext *context = TheDecl->getDeclContext();
+  if (isa<HLSLBufferDecl>(context)) {
+    return true;
+  }
+
+  return false;
+}
+
+static const CXXRecordDecl *getRecordDeclFromVarDecl(VarDecl *VD) {
+  const Type *Ty = VD->getType()->getPointeeOrArrayElementType();
+  assert(Ty && "Resource class must have an element type.");
+
+  if (const auto *TheBuiltinTy = dyn_cast<BuiltinType>(Ty))
+    return nullptr;
+
+  const CXXRecordDecl *TheRecordDecl = Ty->getAsCXXRecordDecl();
+  assert(TheRecordDecl &&
+         "Resource class should have a resource type declaration.");
+
+  if (auto TDecl = dyn_cast<ClassTemplateSpecializationDecl>(TheRecordDecl))
+    TheRecordDecl = TDecl->getSpecializedTemplate()->getTemplatedDecl();
+  TheRecordDecl = TheRecordDecl->getCanonicalDecl();
+  return TheRecordDecl;
+}
+
+static void setResourceClassFlagsFromDeclResourceClass(
+    RegisterBindingFlags &Flags, llvm::hlsl::ResourceClass DeclResourceClass) {
+  switch (DeclResourceClass) {
+  case llvm::hlsl::ResourceClass::SRV:
+    Flags.SRV = true;
+    break;
+  case llvm::hlsl::ResourceClass::UAV:
+    Flags.UAV = true;
+    break;
+  case llvm::hlsl::ResourceClass::CBuffer:
+    Flags.CBV = true;
+    break;
+  case llvm::hlsl::ResourceClass::Sampler:
+    Flags.Sampler = true;
+    break;
+  }
+}
+
+template <typename T>
+static const T *getSpecifiedHLSLAttrFromVarDecl(VarDecl *VD) {
+
+  if (VD) {
+    const CXXRecordDecl *TheRecordDecl = getRecordDeclFromVarDecl(VD);
+    if (!TheRecordDecl)
+      return nullptr;
+
+    // the resource attr could be on the record decl itself or on one of
+    // its fields (the resource handle, most commonly)
+    const auto *Attr = TheRecordDecl->getAttr<T>();
+    if (!Attr) {
+      for (auto *FD : TheRecordDecl->fields()) {
----------------
bob80905 wrote:

I set it to FieldDecl just in case 👍

https://github.com/llvm/llvm-project/pull/97103