[PATCH] D133586: [clang] do not hash undefined qualifiers for FunctionNoProtoType

[Richard Howell via Phabricator via cfe-commits]

rmaz created this revision.
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When calculating the ODR hash of a `FunctionNoProtoType` do not
include qualifiers derived from `FastTypeQuals`. These are only
defined in the constructor for `FunctionProtoType`.

This change ensures the ODR hash and PCM output is stable for
and modules containing `FunctionNoProtoType`s.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D133586

Files:
  clang/lib/AST/ODRHash.cpp


Index: clang/lib/AST/ODRHash.cpp
===================================================================
--- clang/lib/AST/ODRHash.cpp
+++ clang/lib/AST/ODRHash.cpp
@@ -889,9 +889,12 @@
   void VisitFunctionType(const FunctionType *T) {
     AddQualType(T->getReturnType());
     T->getExtInfo().Profile(ID);
-    Hash.AddBoolean(T->isConst());
-    Hash.AddBoolean(T->isVolatile());
-    Hash.AddBoolean(T->isRestrict());
+    if (T->isFunctionProtoType()) {
+      // These values are undefined for FunctionNoProtoType
+      Hash.AddBoolean(T->isConst());
+      Hash.AddBoolean(T->isVolatile());
+      Hash.AddBoolean(T->isRestrict());
+    }
     VisitType(T);
   }
 


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