[PATCH] D152429: [Clang][Type] Add static assertion to guard future expansion for BuiltinType numbering

[Yueh-Ting (eop) Chen via Phabricator via cfe-commits]

eopXD updated this revision to Diff 529634.
eopXD added a comment.

Address comment from Aaron.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D152429/new/

https://reviews.llvm.org/D152429

Files:
  clang/include/clang/AST/Type.h


Index: clang/include/clang/AST/Type.h
===================================================================
--- clang/include/clang/AST/Type.h
+++ clang/include/clang/AST/Type.h
@@ -1649,7 +1649,8 @@
     unsigned : NumTypeBits;
 
     /// The kind (BuiltinType::Kind) of builtin type this is.
-    unsigned Kind : 8;
+    static constexpr unsigned NumOfBuiltinTypeBits = 8;
+    unsigned Kind : NumOfBuiltinTypeBits;
   };
 
   /// FunctionTypeBitfields store various bits belonging to FunctionProtoType.
@@ -2677,6 +2678,10 @@
       : Type(Builtin, QualType(),
              K == Dependent ? TypeDependence::DependentInstantiation
                             : TypeDependence::None) {
+    static_assert(Kind::LastKind <
+                      (1 << BuiltinTypeBitfields::NumOfBuiltinTypeBits) &&
+                  "Defined builtin type exceeds the allocated space for serial "
+                  "numbering");
     BuiltinTypeBits.Kind = K;
   }
 


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