[clang] [HLSL] Add implicit resource element type concepts to AST (PR #112600)

[Chris B via cfe-commits]

================
@@ -323,30 +324,101 @@ struct TemplateParameterListBuilder {
         S.Context, Builder.Record->getDeclContext(), SourceLocation(),
         SourceLocation(), /* TemplateDepth */ 0, Position,
         &S.Context.Idents.get(Name, tok::TokenKind::identifier),
-        /* Typename */ false,
-        /* ParameterPack */ false);
+        /* Typename */ true,
+        /* ParameterPack */ false,
+        /* HasTypeConstraint*/ false);
     if (!DefaultValue.isNull())
       Decl->setDefaultArgument(
           S.Context, S.getTrivialTemplateArgumentLoc(DefaultValue, QualType(),
                                                      SourceLocation()));
-
+    Decl->setReferenced();
     Params.emplace_back(Decl);
     return *this;
   }
 
-  BuiltinTypeDeclBuilder &finalizeTemplateArgs() {
+  ConceptSpecializationExpr *getConceptSpecializationExpr(Sema &S,
+                                                          ConceptDecl *CD) {
+    ASTContext &context = S.getASTContext();
+    SourceLocation loc = Builder.Record->getBeginLoc();
+    DeclarationNameInfo DNI(CD->getDeclName(), loc);
+    NestedNameSpecifierLoc NNSLoc;
+    DeclContext *DC = Builder.Record->getDeclContext();
+    TemplateArgumentListInfo TALI(loc, loc);
+
+    // assume that the concept decl has just one template parameter
+    TemplateTypeParmDecl *ConceptTTPD = dyn_cast<TemplateTypeParmDecl>(
+        CD->getTemplateParameters()->getParam(0));
+
+    clang::TemplateTypeParmDecl *T = clang::TemplateTypeParmDecl::Create(
+        context,                          // AST context
+        context.getTranslationUnitDecl(), // DeclContext
+        SourceLocation(), SourceLocation(),
+        /*depth=*/0,                // Depth in the template parameter list
+        /*position=*/0,             // Position in the template parameter list
+        /*id=*/nullptr,             // Identifier for 'T'
+        /*Typename=*/true,          // Indicates this is a 'typename' or 
'class'
+        /*ParameterPack=*/false,    // Not a parameter pack
+        /*HasTypeConstraint=*/false // Not a parameter pack
+    );
+
+    T->setDeclContext(DC);
+    T->setReferenced();
+
+    clang::QualType ConceptTType = context.getTypeDeclType(ConceptTTPD);
+
+    TemplateArgument ConceptTA = TemplateArgument(ConceptTType);
+
+    std::vector<TemplateArgument> ConceptConvertedArgsVec = {ConceptTA};
+    ArrayRef<TemplateArgument> ConceptConvertedArgs = ConceptConvertedArgsVec;
+
+    clang::QualType CSETType = context.getTypeDeclType(T);
+
+    TemplateArgument CSETA = TemplateArgument(CSETType);
+
+    std::vector<TemplateArgument> CSEConvertedArgsVec = {CSETA};
+    ArrayRef<TemplateArgument> CSEConvertedArgs = CSEConvertedArgsVec;
+
+    ImplicitConceptSpecializationDecl *ImplicitCSEDecl =
+        ImplicitConceptSpecializationDecl::Create(
+            context, Builder.Record->getDeclContext(), loc, CSEConvertedArgs);
+
+    const ConstraintSatisfaction CS(CD, ConceptConvertedArgs);
----------------
llvm-beanz wrote:

```suggestion
    clang::QualType CSETType = context.getTypeDeclType(T);

    TemplateArgument CSETA = TemplateArgument(CSETType);

    ImplicitConceptSpecializationDecl *ImplicitCSEDecl =
        ImplicitConceptSpecializationDecl::Create(
            context, Builder.Record->getDeclContext(), loc, {CSETA});

    const ConstraintSatisfaction CS(CD, {ConceptTA});
```

https://github.com/llvm/llvm-project/pull/112600
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