Re: [C++ PATCH take #2] PR c++/96442: Improved error recovery in enumerations.

[Jason Merrill <jason@redhat.com>]

On 6/5/22 06:09, Roger Sayle wrote:
> 
> Hi Jason,
> My apologies for the long delay, but I've finally got around to
> implementing your suggested improvements (implied by your review):
> https://gcc.gnu.org/pipermail/gcc-patches/2022-March/591504.html
> of my patch for PR c++/96442:
> https://gcc.gnu.org/pipermail/gcc-patches/2022-February/590716.html
> 
> The "How does that happen?" is insightful and leads to a cleaner
> solution, setting ENUM_UNDERLYING_TYPE to integer_type_node when
> issuing an error, so that this invariant holds during the parser's
> error recovery.  I've also moved the new testcase to the g++.dg/parse
> subdirectory as per your feedback on my previous ICE-on-invalid fixes.
> 
> This patch has been tested on x86_64-pc-linunx-gnu with make bootstrap
> and make -k check with no new (unexpected) failures.  Ok for mainline?

OK.

> 2022-06-05  Roger Sayle  <roger@nextmovesoftware.com>
> 
> gcc/cp/ChangeLog
>          PR c++/96442
>          * decl.cc (start_enum): When emitting a "must be integral" error,
>          set ENUM_UNDERLYING_TYPE to integer_type_node, to avoid an ICE
>          downstream in build_enumeration.
> 
> gcc/testsuite/ChangeLog
>          PR c++/96442
>          * g++.dg/parse/pr96442.C: New test cae.
> 
> Thanks again,
> Roger
> --
> 
>> -----Original Message-----
>> From: Jason Merrill <jason@redhat.com>
>> Sent: 10 March 2022 05:06
>> To: Roger Sayle <roger@nextmovesoftware.com>; gcc-patches@gcc.gnu.org
>> Subject: Re: [C++ PATCH] PR c++/96442: Another improved error recovery in
>> enumerations.
>>
>> On 2/22/22 08:02, Roger Sayle wrote:
>>>
>>> This patch resolves PR c++/96442, another ICE-after-error regression.
>>> In this case, invalid code attempts to use a non-integral type as the
>>> underlying type for an enumeration (a record_type in the example given
>>> in the bugzilla PR), for which the parser emits an error message but
>>> allows the inappropriate type to leak to downstream code.
>>
>> How does that happen?
>>
>> Would it help to change dependent_type_p in start_enum to
>> WILDCARD_TYPE_P?
>>
>>> The minimal
>>> safe fix is to double check that the enumeration's underlying type
>>> EUTYPE satisfies INTEGRAL_TYPE_P before calling int_fits_type_p in
>>> build_enumerator.  This is a one line fix, but correcting indentation
>>> and storing a common subexpression in a variable makes the change look
>>> a little bigger.
>>>
>>> This patch has been tested on x86_64-pc-linunx-gnu with make bootstrap
>>> and make -k check with no new (unexpected) failures.  Ok for mainline?
>>>
>>>
>>> 2022-02-22  Roger Sayle  <roger@nextmovesoftware.com>
>>>
>>> gcc/cp/ChangeLog
>>> 	PR c++/96442
>>> 	* decl.cc (build_enumeration): Check ENUM_UNDERLYING_TYPE is
>>> 	INTEGRAL_TYPE_P before calling int_fits_type_p.
>>>
>>> gcc/testsuite/ChangeLog
>>> 	PR c++/96442
>>> 	* g++.dg/pr96442.C: New test cae.
>>>
>>>
>>> Thanks in advance,
>>> Roger
>>> --
>>>
>