================
@@ -2433,6 +2429,30 @@ CFGBlock *CFGBuilder::VisitChildren(Stmt *S) {
return B;
}
+CFGBlock *CFGBuilder::VisitCXXDefaultArgExpr(CXXDefaultArgExpr *Arg,
+ AddStmtChoice asc) {
+ if (Arg->hasRewrittenInit()) {
+ if (asc.alwaysAdd(*this, Arg)) {
+ autoCreateBlock();
+ appendStmt(Block, Arg);
+ }
+ return VisitStmt(Arg->getExpr(), asc);
+ }
+ return VisitStmt(Arg, asc);
----------------
yronglin wrote:
Thanks a lot for your review!
> I think it'd be useful to keep some of the old comment here: we can't add the
> default argument if it's not rewritten because we could end up with the same
> expression appearing multiple times.
Agree 100%, keep the old comment here can make things more clear.
> Actually, are we safe from that even if the default argument is rewritten? Do
> we guarantee to recreate all subexpressions in that case?
Not exactly, The rebuild implementation is the following, it's ignores
`LambdaExpr`, `BlockExpr` and `CXXThisExpr`, And
`EnsureImmediateInvocationInDefaultArgs`’s name may need to be refine.
https://github.com/llvm/llvm-project/blob/78b3a00418ce6da0426a261a64a77608d0264fe5/clang/lib/Sema/SemaExpr.cpp#L5707-L5723
https://github.com/llvm/llvm-project/pull/91879
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