hokein added inline comments.
================
Comment at: clang/lib/Sema/SemaChecking.cpp:5779
QualType ParamTy = Proto->getParamType(ArgIdx);
+ if (ParamTy->containsErrors())
+ continue;
----------------
ArcsinX wrote:
> hokein wrote:
> > It looks like for the failure case the `ParamTy` for the parameter is a
> > dependent array type, and it violates the "non-dependent" assumption of
> > `clang::ASTContext::getTypeInfoImpl` which is called by
> > `getTypeAlignInChars` in `CheckArgAlignment`.
> >
> > so I'd suggest moving the fix to `CheckArgAlignment` line 5685 (adding a
> > `ParamTy->isDependentType()` to the `if` condition).
> When I found this problem I fixed it like you are suggesting. But after that
> I replaced it with this check, because it seems there is no reason to try to
> check something on code with errors.
>
> I mean that even if we are not crashing, results from `CheckArgAlignment()`
> can't be trusted if we are passing something with errors to it.
> because it seems there is no reason to try to check something on code with
> errors.
I think this is case-by-case (for this case, it may be true) -- in some cases
(see test7 and test8 for example in `recovery-expr-type.cpp`), we do want to
check something even on the code with errors to emit useful secondary
diagnostics. In general we want to emit a full list of diagnostics and at the
same time avoid any suspicious diagnostics, however achieving both goals is
hard.
Depending on how fatal the error is
- if the error is fatal, RecoveryError is just a dependent-type wrapper, we
should not call check* to emit diagnostics (we're less certain about the
quality of these diagnostics), this is mostly done by leveraging on the
existing template dependent mechanism;
- if the error is minor, RecoveryError preserves a concrete type, we might want
call check* to emit diagnostics as we're more confident;
The current solution makes sense to fix the crash, but I think the main reason
is that `CheckArgAlignment` now can be invoked with a dependent-type parameter
in non-template context (after we extended the "dependent" concept from
depending on template parameters to depending on template parameters and
errors), so we should fix `CheckArgAlignment`.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D133886/new/
https://reviews.llvm.org/D133886
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