[PATCH] D154784: [clang] Fix crash caused by PseudoObjectExprBitfields::NumSubExprs overflow

[David Blaikie via Phabricator via cfe-commits]

dblaikie added inline comments.


================
Comment at: clang/include/clang/AST/Stmt.h:596-597
 
-    // These don't need to be particularly wide, because they're
-    // strictly limited by the forms of expressions we permit.
-    unsigned NumSubExprs : 8;
-    unsigned ResultIndex : 32 - 8 - NumExprBits;
+    unsigned NumSubExprs : 16;
+    unsigned ResultIndex : 16;
   };
----------------
Could/should we add some error checking in the ctor to assert that we don't overflow these longer values/just hit the bug later on?

(& could we use `unsigned short` here rather than bitfields?)


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D154784/new/

https://reviews.llvm.org/D154784