During codegen of a virtual call we would extract any casts in the expression
to see if we had an underlying final class or method, but we would then
use the cast type to do the call, resulting in a direct call to the wrong
method.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159212 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 07f3c1d..4dd6f0b 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -10844,6 +10844,22 @@
}
SemaRef.MarkAnyDeclReferenced(Loc, D);
+
+ // If this is a call to a method via a cast, also mark the method in the
+ // derived class used in case codegen can devirtualize the call.
+ const MemberExpr *ME = dyn_cast<MemberExpr>(E);
+ if (!ME)
+ return;
+ CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ME->getMemberDecl());
+ if (!MD)
+ return;
+ const Expr *Base = ME->getBase();
+ const CXXRecordDecl *MostDerivedClassDecl
+ = Base->getMostDerivedClassDeclForType();
+ if (!MostDerivedClassDecl)
+ return;
+ CXXMethodDecl *DM = MD->getCorrespondingMethodInClass(MostDerivedClassDecl);
+ SemaRef.MarkAnyDeclReferenced(Loc, DM);
}
/// \brief Perform reference-marking and odr-use handling for a DeclRefExpr.