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* [Bug libstdc++/96345] New: __cxa demangle fails to demangle a very long string
@ 2020-07-27 19:55 hededrk at gmail dot com
2020-07-27 19:57 ` [Bug libstdc++/96345] " hededrk at gmail dot com
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: hededrk at gmail dot com @ 2020-07-27 19:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96345
Bug ID: 96345
Summary: __cxa demangle fails to demangle a very long string
Product: gcc
Version: 10.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: hededrk at gmail dot com
Target Milestone: ---
I found this bug because one of my tests started to fail (not sure when it
started to fail because I've set up CI only yesterday). I assume this is a bug
because GCC is able to produce such names.
Steps to reproduce:
1. compile attached file
g++ -c cxa_demangle_fail.cpp
2. obtain mangled name with nm
nm cxa_demangle_fail.o
3. pass that name into abi::__cxa_demangle
auto name = /*long string*/;
size_t size = 1024;
auto memory = static_cast<char*>(malloc(size));
int status;
auto demangled = abi::__cxa_demangle(name, memory, &size, &status);
Result: __cxa_demangle fails with code -2.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libstdc++/96345] __cxa demangle fails to demangle a very long string
2020-07-27 19:55 [Bug libstdc++/96345] New: __cxa demangle fails to demangle a very long string hededrk at gmail dot com
@ 2020-07-27 19:57 ` hededrk at gmail dot com
2020-07-27 19:58 ` hededrk at gmail dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: hededrk at gmail dot com @ 2020-07-27 19:57 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96345
--- Comment #1 from V <hededrk at gmail dot com> ---
Created attachment 48936
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48936&action=edit
failing example
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libstdc++/96345] __cxa demangle fails to demangle a very long string
2020-07-27 19:55 [Bug libstdc++/96345] New: __cxa demangle fails to demangle a very long string hededrk at gmail dot com
2020-07-27 19:57 ` [Bug libstdc++/96345] " hededrk at gmail dot com
@ 2020-07-27 19:58 ` hededrk at gmail dot com
2020-07-27 21:18 ` pinskia at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: hededrk at gmail dot com @ 2020-07-27 19:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96345
--- Comment #2 from V <hededrk at gmail dot com> ---
Created attachment 48937
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48937&action=edit
function with name that __cxa_demangle rejects
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libstdc++/96345] __cxa demangle fails to demangle a very long string
2020-07-27 19:55 [Bug libstdc++/96345] New: __cxa demangle fails to demangle a very long string hededrk at gmail dot com
2020-07-27 19:57 ` [Bug libstdc++/96345] " hededrk at gmail dot com
2020-07-27 19:58 ` hededrk at gmail dot com
@ 2020-07-27 21:18 ` pinskia at gcc dot gnu.org
2020-07-28 4:49 ` hededrk at gmail dot com
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2020-07-27 21:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96345
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Does c++filt demangle it?
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libstdc++/96345] __cxa demangle fails to demangle a very long string
2020-07-27 19:55 [Bug libstdc++/96345] New: __cxa demangle fails to demangle a very long string hededrk at gmail dot com
` (2 preceding siblings ...)
2020-07-27 21:18 ` pinskia at gcc dot gnu.org
@ 2020-07-28 4:49 ` hededrk at gmail dot com
2020-07-28 8:50 ` hededrk at gmail dot com
2022-05-30 9:39 ` [Bug demangler/96345] " hededrk at gmail dot com
5 siblings, 0 replies; 7+ messages in thread
From: hededrk at gmail dot com @ 2020-07-28 4:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96345
--- Comment #4 from V <hededrk at gmail dot com> ---
No, c++filt also does not demangle it.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libstdc++/96345] __cxa demangle fails to demangle a very long string
2020-07-27 19:55 [Bug libstdc++/96345] New: __cxa demangle fails to demangle a very long string hededrk at gmail dot com
` (3 preceding siblings ...)
2020-07-28 4:49 ` hededrk at gmail dot com
@ 2020-07-28 8:50 ` hededrk at gmail dot com
2022-05-30 9:39 ` [Bug demangler/96345] " hededrk at gmail dot com
5 siblings, 0 replies; 7+ messages in thread
From: hededrk at gmail dot com @ 2020-07-28 8:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96345
--- Comment #5 from V <hededrk at gmail dot com> ---
(In reply to Andrew Pinski from comment #3)
> Does c++filt demangle it?
I've fed output of nm into c++filt and this function came out mangled, while
others were demangled.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug demangler/96345] __cxa demangle fails to demangle a very long string
2020-07-27 19:55 [Bug libstdc++/96345] New: __cxa demangle fails to demangle a very long string hededrk at gmail dot com
` (4 preceding siblings ...)
2020-07-28 8:50 ` hededrk at gmail dot com
@ 2022-05-30 9:39 ` hededrk at gmail dot com
5 siblings, 0 replies; 7+ messages in thread
From: hededrk at gmail dot com @ 2022-05-30 9:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96345
V <hededrk at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|10.1.0 |12.1.1
Host| |x86_64
Target| |x86_64
--- Comment #6 from V <hededrk at gmail dot com> ---
Still fails as of GCC 12.1.
I've shortened the input string, it fails with names longer than 999
characters.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2022-05-30 9:39 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2020-07-27 19:55 [Bug libstdc++/96345] New: __cxa demangle fails to demangle a very long string hededrk at gmail dot com
2020-07-27 19:57 ` [Bug libstdc++/96345] " hededrk at gmail dot com
2020-07-27 19:58 ` hededrk at gmail dot com
2020-07-27 21:18 ` pinskia at gcc dot gnu.org
2020-07-28 4:49 ` hededrk at gmail dot com
2020-07-28 8:50 ` hededrk at gmail dot com
2022-05-30 9:39 ` [Bug demangler/96345] " hededrk at gmail dot com
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