public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c++/112553] New: noexcept lambda does not generate call to terminate
@ 2023-11-15 19:44 federico at kircheis dot it
2023-11-15 20:03 ` [Bug c++/112553] " pinskia at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: federico at kircheis dot it @ 2023-11-15 19:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112553
Bug ID: 112553
Summary: noexcept lambda does not generate call to terminate
Product: gcc
Version: 13.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: federico at kircheis dot it
Target Milestone: ---
Consider following example
----
void do_something();
void bar(){
[]() noexcept{
do_something();
}();
}
----
If "do_something" throws, as the lambda is marked noexcept, there should be a
call to std::terminate, but it is not the case: https://godbolt.org/z/xjqzTdrWG
clang and msvc generate the call to std::terminate
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/112553] noexcept lambda does not generate call to terminate
2023-11-15 19:44 [Bug c++/112553] New: noexcept lambda does not generate call to terminate federico at kircheis dot it
@ 2023-11-15 20:03 ` pinskia at gcc dot gnu.org
2023-11-15 20:22 ` redi at gcc dot gnu.org
2023-11-15 20:27 ` federico at kircheis dot it
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-11-15 20:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112553
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
#include <stdio.h>
[[gnu::noipa, gnu::noinline]]
void do_something()
{
throw 1;
}
void bar(){
[]() noexcept{
do_something();
}();
}
int main()
{
try {
bar();
}catch(...) { printf("incorrectly caught eh.\n"); }
}
```
Works as expected and std::terminate gets called.
I don't see a reason to directly call std::terminate here if it is going to be
called from the personality function.
The original issue where this would be an issue was fix a while back. Anyways
at -O1 tail calls are not enabled even so you can't run into the original
issue.
See PR 82081 also.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/112553] noexcept lambda does not generate call to terminate
2023-11-15 19:44 [Bug c++/112553] New: noexcept lambda does not generate call to terminate federico at kircheis dot it
2023-11-15 20:03 ` [Bug c++/112553] " pinskia at gcc dot gnu.org
@ 2023-11-15 20:22 ` redi at gcc dot gnu.org
2023-11-15 20:27 ` federico at kircheis dot it
2 siblings, 0 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2023-11-15 20:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112553
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Federico Kircheis from comment #0)
> If "do_something" throws, as the lambda is marked noexcept, there should be
> a call to std::terminate, but it is not the case:
> https://godbolt.org/z/xjqzTdrWG
Nothing in the standard supports your claim. The standard only says that
std::terminate is invoked, not that a call to it must appear in the assembly
code for the function.
G++ will invoke std::terminate in a complete example as Andrew showed. And it
does it with smaller, more cache-friendly code.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/112553] noexcept lambda does not generate call to terminate
2023-11-15 19:44 [Bug c++/112553] New: noexcept lambda does not generate call to terminate federico at kircheis dot it
2023-11-15 20:03 ` [Bug c++/112553] " pinskia at gcc dot gnu.org
2023-11-15 20:22 ` redi at gcc dot gnu.org
@ 2023-11-15 20:27 ` federico at kircheis dot it
2 siblings, 0 replies; 4+ messages in thread
From: federico at kircheis dot it @ 2023-11-15 20:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112553
--- Comment #3 from Federico Kircheis <federico at kircheis dot it> ---
I stand corrected, sorry for the report.
Where can I find official information/documentation about the personality
function used by gcc?
The fact that clang and msvc handle this case differently made me believe gcc
was incorrect.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2023-11-15 20:27 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-11-15 19:44 [Bug c++/112553] New: noexcept lambda does not generate call to terminate federico at kircheis dot it
2023-11-15 20:03 ` [Bug c++/112553] " pinskia at gcc dot gnu.org
2023-11-15 20:22 ` redi at gcc dot gnu.org
2023-11-15 20:27 ` federico at kircheis dot it
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).