hokein added a comment.
================
Comment at: clang/lib/Sema/SemaExpr.cpp:16749-16753
+ bool ContainsError = llvm::any_of(BSI->Returns, [](const ReturnStmt *Return)
{
+ const auto *RetValExpr = Return->getRetValue();
+ return RetValExpr && RetValExpr->containsErrors();
+ });
+ BlockExpr *Result = new (Context) BlockExpr(BD, BlockTy, ContainsError);
----------------
aaron.ballman wrote:
> Hmmm -- is the block *expression* what contains the errors in this case or
> is it the block declaration? I would have expected this to be an issue for
> the block declaration created for the block expression. CC @rjmccall
I think a reasonable model is to follow how we handle `FunctionDecl`, as
`BlockDecl` and `FunctionDecl` are similar function-decl concepts.
For the crash case like `int (^a)() = ^() { return undefined; }`, we should:
- invalidate the `BlockDecl` as its returned type can not be deduced because of
the error return stmt (similar to `FunctionDecl`, we invalidate it for `auto
func() { return undefined; }`)
- for an invalid `BlockDecl`, we should not build a `BlockExpr` that refers to
it (we don't build `DeclRefExpr` for invalid `FunctionDecl`). For error
recovery, we should use `RecoveryExpr`.
So I think the reasonable fix is to invalidate the BlockDecl (calling
`Decl->setInvalidDecl()`) if its body has any error stmt, and return
`ExprError()` if the BlockDecl is invalid.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D155396/new/
https://reviews.llvm.org/D155396
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