[clang] [Clang] [P2996] Support reflecting arbitrary types and aliases (PR #232074)

[Ambrose Leeb via cfe-commits]

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@@ -315,6 +318,28 @@ ExprDependence clang::computeDependence(CXXUuidofExpr *E) {
   return turnTypeToValueDependence(E->getExprOperand()->getDependence());
 }
 
+ExprDependence clang::computeDependence(CXXReflectExpr *E) {
+  QualType QT = E->getTypeSourceInfo()->getType();
+  ExprDependence D =
+      turnTypeToValueDependence(toExprDependenceAsWritten(QT->getDependence()));
+  if (isTypeAliasAsReflectionName(QT)) {
+    const NamedDecl *Alias;
+    if (const auto *T = dyn_cast<TypedefType>(QT.getTypePtr())) {
+      Alias = T->getDecl();
+    } else {
+      const auto *TST = cast<TemplateSpecializationType>(QT.getTypePtr());
+      Alias = TST->getTemplateName().getAsTemplateDecl();
+      for (const auto &Arg : TST->template_arguments())
+        if (Arg.isDependent())
+          D |= ExprDependence::ValueInstantiation;
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Sirraide wrote:

I believe packs are expanded in tree transform before we get here

https://github.com/llvm/llvm-project/pull/232074