[cfe-commits] r165769 - /cfe/trunk/include/clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h

Sean Silva silvas at purdue.edu
Thu Oct 11 16:31:18 PDT 2012

Author: silvas
Date: Thu Oct 11 18:31:18 2012
New Revision: 165769

URL: http://llvm.org/viewvc/llvm-project?rev=165769&view=rev
Add missing classof().

Somewhat troublingly, without this implemented, the check inside
isa_impl<> would silently use the parent's `classof()` when determining
whether it was okay to downcast from the parent to the child!

Bug analysis:

A build failure after removing the parent's `classof()` initially
alerted me to the bug, after which a little bit of thinking and reading
of the code identified the root cause.

The compiler could be made to prevent this bug from happening if there
were a way to ensure that in the code

    template <typename To, typename From, typename Enabler = void>
    struct isa_impl {
      static inline bool doit(const From &Val) {
        return To::classof(&Val);

that `To::classof` is actually inside the class `To`, and not in a base
class. I am not aware of a way to check this in C++. If there is a means
to perform that check, please bring it up on the list and this will be

There is a high likelihood that there are other instances of this same
bug in the codebase.


Modified: cfe/trunk/include/clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h?rev=165769&r1=165768&r2=165769&view=diff
--- cfe/trunk/include/clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h (original)
+++ cfe/trunk/include/clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h Thu Oct 11 18:31:18 2012
@@ -399,6 +399,10 @@
   virtual void flattenLocations() { Pos.flatten(); }
   virtual void Profile(llvm::FoldingSetNodeID &ID) const;
+  static bool classof(const PathDiagnosticPiece *P) {
+    return P->getKind() == Event || P->getKind() == Macro;
+  }
 /// \brief Interface for classes constructing Stack hints.

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