[Sema] Add more strict check for sizeof diagnostics for bzero
Follow-up from r278264 after Joerg's feedback.
Since bzero is not standard, be more strict: also check if the first
argument is a pointer, which harden the check for when it does not come
originally from a builtin.
llvm-svn: 278379
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index f76ab08..c1781c2 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -6199,6 +6199,13 @@
const Expr *SizeOfArg = getSizeOfExprArg(LenExpr);
llvm::FoldingSetNodeID SizeOfArgID;
+ // Although widely used, 'bzero' is not a standard function. Be more strict
+ // with the argument types before allowing diagnostics and only allow the
+ // form bzero(ptr, sizeof(...)).
+ QualType FirstArgTy = Call->getArg(0)->IgnoreParenImpCasts()->getType();
+ if (BId == Builtin::BIbzero && !FirstArgTy->getAs<PointerType>())
+ return;
+
for (unsigned ArgIdx = 0; ArgIdx != LastArg; ++ArgIdx) {
const Expr *Dest = Call->getArg(ArgIdx)->IgnoreParenImpCasts();
SourceRange ArgRange = Call->getArg(ArgIdx)->getSourceRange();