Assert out of bounds in advance

Author: YexuanXiao

clang/lib/AST/ASTContext.cpp

@@ -5222,13 +5222,14 @@ QualType ASTContext::getDependentBitIntType(bool IsUnsigned,
 
 QualType
 ASTContext::getPredefinedSugarType(PredefinedSugarType::Kind KD) const {
+  using Kind = PredefinedSugarType::Kind;
+
+  assert(KD != Kind::Max);
 
-  auto Target = PredefinedSugarTypes[llvm::to_underlying(KD)];
+  auto *Target = PredefinedSugarTypes[llvm::to_underlying(KD)];
   if (Target != nullptr)
     return QualType(Target, 0);
 
-  using Kind = PredefinedSugarType::Kind;
-
   auto getCanonicalType = [](const ASTContext &Ctx, Kind KDI) -> QualType {
     switch (KDI) {
       // size_t (C99TC3 6.5.3.4), signed size_t (C++23 5.13.2) and