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* [Bug c++/114638] New: Hang and Memory Consumption Increase during Compilation with Recursive Template Instantiation
@ 2024-04-08 12:07 iamanonymous.cs at gmail dot com
2024-04-08 12:37 ` [Bug c++/114638] " xry111 at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: iamanonymous.cs at gmail dot com @ 2024-04-08 12:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114638
Bug ID: 114638
Summary: Hang and Memory Consumption Increase during
Compilation with Recursive Template Instantiation
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: iamanonymous.cs at gmail dot com
Target Milestone: ---
The following code snippet triggers a hang issue:
============================================
$ cat bug.cpp
struct Z
{
Z () = default;
Z (Z const &) = default;
constexpr Z (Z &&) {}
};
template < typename T >
constexpr int
fn (T v)
{
return fn (v);
}
auto t = fn (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z
(Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z
(Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z (Z ());
============================================
The code with this syntax error should promptly output a compilation error
instead of hanging indefinitely and depleting memory resources. The command we
used is(no error output):
============================================
g++ bug.cpp
============================================
The GCC version:
============================================
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/cTest/gcc/myinstall/libexec/gcc/x86_64-linux-gnu/14.0.1/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../configure -v --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --enable-checking=no
--enable-languages=c,c++ --disable-multilib --prefix=/home/cTest/gcc/myinstall
--disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.1 20240329 (experimental) (GCC)
============================================
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/114638] Hang and Memory Consumption Increase during Compilation with Recursive Template Instantiation
2024-04-08 12:07 [Bug c++/114638] New: Hang and Memory Consumption Increase during Compilation with Recursive Template Instantiation iamanonymous.cs at gmail dot com
@ 2024-04-08 12:37 ` xry111 at gcc dot gnu.org
2024-04-08 20:38 ` [Bug c++/114638] Hang and Memory Consumption Increase during Compilation with many object creation of itself pinskia at gcc dot gnu.org
2024-04-08 20:48 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: xry111 at gcc dot gnu.org @ 2024-04-08 12:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114638
Xi Ruoyao <xry111 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |xry111 at gcc dot gnu.org
--- Comment #1 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
The test case is just a "compiler bomb" and I don't know if we can do anything
better.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/114638] Hang and Memory Consumption Increase during Compilation with many object creation of itself
2024-04-08 12:07 [Bug c++/114638] New: Hang and Memory Consumption Increase during Compilation with Recursive Template Instantiation iamanonymous.cs at gmail dot com
2024-04-08 12:37 ` [Bug c++/114638] " xry111 at gcc dot gnu.org
@ 2024-04-08 20:38 ` pinskia at gcc dot gnu.org
2024-04-08 20:48 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-08 20:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114638
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Hang and Memory Consumption |Hang and Memory Consumption
|Increase during Compilation |Increase during Compilation
|with Recursive Template |with many object creation
|Instantiation |of itself
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This has nothing to do with template but rather
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/114638] Hang and Memory Consumption Increase during Compilation with many object creation of itself
2024-04-08 12:07 [Bug c++/114638] New: Hang and Memory Consumption Increase during Compilation with Recursive Template Instantiation iamanonymous.cs at gmail dot com
2024-04-08 12:37 ` [Bug c++/114638] " xry111 at gcc dot gnu.org
2024-04-08 20:38 ` [Bug c++/114638] Hang and Memory Consumption Increase during Compilation with many object creation of itself pinskia at gcc dot gnu.org
@ 2024-04-08 20:48 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-08 20:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114638
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2024-04-08
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Known to fail| |4.1.2
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
the problem seems related to tentative parsing. But I will note clang does give
an error quickly.
Reduced C++98 testcase:
```
struct Z
{
Z ();
Z (Z const &);
};
Z t = Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z ( Z
(Z (Z (Z ()));
```
GCC did get worse over time though. Add one more `Z(` and it fails. There is
definitely some O(n^2) issue going on. Most likely trying to figure out if this
is a function declaration vs a function call vs an object creation ...
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2024-04-08 20:48 UTC | newest]
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-- links below jump to the message on this page --
2024-04-08 12:07 [Bug c++/114638] New: Hang and Memory Consumption Increase during Compilation with Recursive Template Instantiation iamanonymous.cs at gmail dot com
2024-04-08 12:37 ` [Bug c++/114638] " xry111 at gcc dot gnu.org
2024-04-08 20:38 ` [Bug c++/114638] Hang and Memory Consumption Increase during Compilation with many object creation of itself pinskia at gcc dot gnu.org
2024-04-08 20:48 ` pinskia at gcc dot gnu.org
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