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* [Bug c++/55532] New: Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function
@ 2012-11-29 19:39 akramnik at gmail dot com
2012-11-29 20:04 ` [Bug c++/55532] " matt at godbolt dot org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: akramnik at gmail dot com @ 2012-11-29 19:39 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55532
Bug #: 55532
Summary: Runtime segfault calling mutable lambda wrapped in a
non-mutable lambda within a template function
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: akramnik@gmail.com
The following code segfaults at runtime when we call fun2.
Compiled with "g++-4.7 -std=c++11 -o main main.cpp"
Code:
struct Foo {
void doit() {
}
};
template<typename T>
void oops(Foo &foo, const T &) {
auto fun = [&] () mutable {
foo.doit();
};
auto fun2 = [=]() {
fun();
};
fun2();
}
int main() {
Foo foo;
oops(foo, 1);
}
Note: if we make it non-templated function, we get a compiler error which
correctly detects the mutable/non-mutable disparity.
main.cpp:11:13: error: passing ‘const oops(Foo&, const int&)::<lambda()>’ as
‘this’ argument of ‘oops(Foo&, const int&)::<lambda()>’ discards qualifiers
[-fpermissive]
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/55532] Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function
2012-11-29 19:39 [Bug c++/55532] New: Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function akramnik at gmail dot com
@ 2012-11-29 20:04 ` matt at godbolt dot org
2012-11-29 20:16 ` paolo.carlini at oracle dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: matt at godbolt dot org @ 2012-11-29 20:04 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55532
--- Comment #1 from Matt Godbolt <matt at godbolt dot org> 2012-11-29 20:03:47 UTC ---
I can reproduce this on GCC 4.8 (rev 185382], and g++ 4.6.3. Adding -O makes
the issue go away (as the whole program is optimized to "return 0;").
From the assembler dump the segv appears to happen when the compiler is
generating a "this" pointer for the inner lambda:
void oops<int>(Foo&, int const&)::{lambda()#1}::_FUN():
pushq %rbp
movq %rsp, %rbp
>>> movl $0, %edi
call void oops<int>(Foo&, int const&)::{lambda()#1}::operator()()
popq %rbp
ret
[this output can also be seen at http://url.godbolt.org/mdjvf ]
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/55532] Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function
2012-11-29 19:39 [Bug c++/55532] New: Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function akramnik at gmail dot com
2012-11-29 20:04 ` [Bug c++/55532] " matt at godbolt dot org
@ 2012-11-29 20:16 ` paolo.carlini at oracle dot com
2012-12-06 15:54 ` redi at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: paolo.carlini at oracle dot com @ 2012-11-29 20:16 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55532
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|akramnik at gmail dot com |
Blocks| |54367
Severity|major |normal
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/55532] Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function
2012-11-29 19:39 [Bug c++/55532] New: Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function akramnik at gmail dot com
2012-11-29 20:04 ` [Bug c++/55532] " matt at godbolt dot org
2012-11-29 20:16 ` paolo.carlini at oracle dot com
@ 2012-12-06 15:54 ` redi at gcc dot gnu.org
2013-03-13 3:13 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2012-12-06 15:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55532
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-12-06
Ever Confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-12-06 15:54:18 UTC ---
Confirmed, I think the code should be rejected.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/55532] Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function
2012-11-29 19:39 [Bug c++/55532] New: Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function akramnik at gmail dot com
` (2 preceding siblings ...)
2012-12-06 15:54 ` redi at gcc dot gnu.org
@ 2013-03-13 3:13 ` jason at gcc dot gnu.org
2013-03-17 2:37 ` jason at gcc dot gnu.org
2013-03-23 19:22 ` jason at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2013-03-13 3:13 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55532
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |jason at gcc dot gnu.org
AssignedTo|unassigned at gcc dot |jason at gcc dot gnu.org
|gnu.org |
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/55532] Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function
2012-11-29 19:39 [Bug c++/55532] New: Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function akramnik at gmail dot com
` (3 preceding siblings ...)
2013-03-13 3:13 ` jason at gcc dot gnu.org
@ 2013-03-17 2:37 ` jason at gcc dot gnu.org
2013-03-23 19:22 ` jason at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2013-03-17 2:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55532
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2013-03-17 02:35:35 UTC ---
Author: jason
Date: Sun Mar 17 02:35:18 2013
New Revision: 196729
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=196729
Log:
PR c++/56447
PR c++/55532
* pt.c (instantiate_class_template_1): Instantiate lambda capture
list here.
(tsubst_copy_and_build): Not here.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-conv8.C
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-mutable2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.c
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/55532] Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function
2012-11-29 19:39 [Bug c++/55532] New: Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function akramnik at gmail dot com
` (4 preceding siblings ...)
2013-03-17 2:37 ` jason at gcc dot gnu.org
@ 2013-03-23 19:22 ` jason at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2013-03-23 19:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55532
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.8.1
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2013-03-23 19:21:55 UTC ---
Fixed for 4.8.1.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2013-03-23 19:22 UTC | newest]
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2012-11-29 19:39 [Bug c++/55532] New: Runtime segfault calling mutable lambda wrapped in a non-mutable lambda within a template function akramnik at gmail dot com
2012-11-29 20:04 ` [Bug c++/55532] " matt at godbolt dot org
2012-11-29 20:16 ` paolo.carlini at oracle dot com
2012-12-06 15:54 ` redi at gcc dot gnu.org
2013-03-13 3:13 ` jason at gcc dot gnu.org
2013-03-17 2:37 ` jason at gcc dot gnu.org
2013-03-23 19:22 ` jason at gcc dot gnu.org
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