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* [Bug c++/58063] New: default arguments evaluated twice per call
@ 2013-08-02 20:38 plokinom at gmail dot com
2013-08-03 20:40 ` [Bug c++/58063] " paolo.carlini at oracle dot com
` (11 more replies)
0 siblings, 12 replies; 13+ messages in thread
From: plokinom at gmail dot com @ 2013-08-02 20:38 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
Bug ID: 58063
Summary: default arguments evaluated twice per call
Product: gcc
Version: 4.8.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: plokinom at gmail dot com
% cat try.cc
#include <iostream>
void f(bool x = !(std::cout << "hi!\n")) {
std::cout << x << '\n';
}
int main() {
f();
}
% g++ try.cc
% ./a.out
hi!
hi!
0
My question: Why is the default argument evaluated twice for each call to f()?
Is this allowed by the standard or a bug in g++?
% g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/mauke/usr/local/libexec/gcc/i686-pc-linux-gnu/4.8.1/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.8.1/configure --prefix=/home/mauke/usr/local
--with-arch=native --with-tune=native --enable-__cxa_atexit
--enable-languages=c,c++,go --disable-nls
Thread model: posix
gcc version 4.8.1 (GCC)
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
@ 2013-08-03 20:40 ` paolo.carlini at oracle dot com
2013-08-03 20:48 ` daniel.kruegler at googlemail dot com
` (10 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: paolo.carlini at oracle dot com @ 2013-08-03 20:40 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
The standard streams are indeed special, being constructed once and never
destroyed, see libstdc++-v3/src/c++98/ios_init.cc. I suppose a minimal
reproducer could involve a file scope static of some sort...
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
2013-08-03 20:40 ` [Bug c++/58063] " paolo.carlini at oracle dot com
@ 2013-08-03 20:48 ` daniel.kruegler at googlemail dot com
2013-08-03 20:58 ` paolo.carlini at oracle dot com
` (9 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2013-08-03 20:48 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
--- Comment #3 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
(In reply to Paolo Carlini from comment #2)
> I suppose a minimal reproducer could involve a file scope static of some sort...
I'm a bit confused by your reply, Paolo: Isn't my_cout also a "file scope
static"? (Even, if I declare it to have static linkage, it still behaves
differently compared to std::cout)
>From gcc-bugs-return-427291-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 20:50:21 2013
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58063] default arguments evaluated twice per call
Date: Sat, 03 Aug 2013 20:50:00 -0000
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--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Sorry, I didn't study it in sufficient detail. Anyway, no mysteries, this is
free software: libstdc++-v3/src/c++98/ios_init.cc etc.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
2013-08-03 20:40 ` [Bug c++/58063] " paolo.carlini at oracle dot com
2013-08-03 20:48 ` daniel.kruegler at googlemail dot com
@ 2013-08-03 20:58 ` paolo.carlini at oracle dot com
2013-08-03 21:23 ` daniel.kruegler at googlemail dot com
` (8 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: paolo.carlini at oracle dot com @ 2013-08-03 20:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Ah, in case isn't obvious already: it only happens when the "I/O expression"
has the ! operator in front.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
` (2 preceding siblings ...)
2013-08-03 20:58 ` paolo.carlini at oracle dot com
@ 2013-08-03 21:23 ` daniel.kruegler at googlemail dot com
2013-08-03 21:34 ` daniel.kruegler at googlemail dot com
` (7 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2013-08-03 21:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
--- Comment #6 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
(In reply to Paolo Carlini from comment #5)
> Ah, in case isn't obvious already: it only happens when the "I/O expression"
> has the ! operator in front.
I suspected that and ensured that I added a similar operator! to my ostream
model type, but this hadn't any impact on the outcome for that type. Further, I
don't understand how it is related to ostream initialization, because the issue
also occurs when we invert the order of the function calls:
int main() {
f2();
std::cout << "------------------\n";
f();
}
gives me:
<quote>
hi!
0
------------------
hi!
hi!
0
</quote>
Are you sure that this is not due to improper code generation?
>From gcc-bugs-return-427294-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 21:31:00 2013
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58063] default arguments evaluated twice per call
Date: Sat, 03 Aug 2013 21:31:00 -0000
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--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I'm not at all sure! But it happens with -O0 too, right?, thus at this point
the front-end seems more likely than the back-end, I would not change the
Component from c++ to something else. In any case we badly need a reduced
testcase ;)
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
` (3 preceding siblings ...)
2013-08-03 21:23 ` daniel.kruegler at googlemail dot com
@ 2013-08-03 21:34 ` daniel.kruegler at googlemail dot com
2013-08-04 12:11 ` fanael4 at gmail dot com
` (6 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2013-08-03 21:34 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
--- Comment #8 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
(In reply to Paolo Carlini from comment #7)
> But it happens with -O0 too, right?
Yes.
> In any case we badly need a reduced testcase ;)
I agree. Unfortunately I'm on vacations from tomorrow on (1 week), so I cannot
look into it until next week.
>From gcc-bugs-return-427296-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Aug 03 21:37:11 2013
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/58063] default arguments evaluated twice per call
Date: Sat, 03 Aug 2013 21:37:00 -0000
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--- Comment #9 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Your help is always very appreciated, Daniel. Here we have plenty of work to do
anyway, if when you will back the bug will be unchanged, consider helping more.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
` (4 preceding siblings ...)
2013-08-03 21:34 ` daniel.kruegler at googlemail dot com
@ 2013-08-04 12:11 ` fanael4 at gmail dot com
2013-08-04 12:22 ` paolo.carlini at oracle dot com
` (5 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: fanael4 at gmail dot com @ 2013-08-04 12:11 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
Fanael <fanael4 at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fanael4 at gmail dot com
--- Comment #10 from Fanael <fanael4 at gmail dot com> ---
My attempt at reducing:
struct basic_ios
{
virtual ~basic_ios() {}
bool operator!() const { return false; }
};
struct ostream : virtual basic_ios
{
ostream() {}
~ostream() {}
private:
ostream(const ostream&);
ostream& operator=(const ostream&);
};
ostream& operator<<(ostream& os, const char* s) {
__builtin_printf("%s", s);
return os;
}
ostream cout;
void f(bool x = !(cout << "hi!\n")) {
__builtin_printf("%d\n", static_cast<int>(x));
}
int main() {
f();
}
Seems like virtual inheritance is the culprit.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
` (5 preceding siblings ...)
2013-08-04 12:11 ` fanael4 at gmail dot com
@ 2013-08-04 12:22 ` paolo.carlini at oracle dot com
2015-06-14 18:02 ` plokinom at gmail dot com
` (4 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: paolo.carlini at oracle dot com @ 2013-08-04 12:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-08-04
CC| |jason at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #11 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Thanks!
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
` (6 preceding siblings ...)
2013-08-04 12:22 ` paolo.carlini at oracle dot com
@ 2015-06-14 18:02 ` plokinom at gmail dot com
2015-06-16 19:29 ` jason at gcc dot gnu.org
` (3 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: plokinom at gmail dot com @ 2015-06-14 18:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
--- Comment #12 from plokinom at gmail dot com ---
I can confirm this still happens with g++ 5.1.0.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
` (7 preceding siblings ...)
2015-06-14 18:02 ` plokinom at gmail dot com
@ 2015-06-16 19:29 ` jason at gcc dot gnu.org
2015-06-17 14:33 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2015-06-16 19:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
--- Comment #13 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue Jun 16 19:29:09 2015
New Revision: 224533
URL: https://gcc.gnu.org/viewcvs?rev=224533&root=gcc&view=rev
Log:
PR c++/58063
* tree.c (bot_manip): Remap SAVE_EXPR.
Added:
trunk/gcc/testsuite/g++.dg/overload/defarg10.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/tree.c
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
` (8 preceding siblings ...)
2015-06-16 19:29 ` jason at gcc dot gnu.org
@ 2015-06-17 14:33 ` jason at gcc dot gnu.org
2015-06-21 9:06 ` ville.voutilainen at gmail dot com
2015-08-18 14:44 ` jason at gcc dot gnu.org
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2015-06-17 14:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
--- Comment #14 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Wed Jun 17 14:33:17 2015
New Revision: 224559
URL: https://gcc.gnu.org/viewcvs?rev=224559&root=gcc&view=rev
Log:
PR c++/58063
* tree.c (bot_manip): Remap SAVE_EXPR.
Added:
branches/gcc-5-branch/gcc/testsuite/g++.dg/overload/defarg10.C
Modified:
branches/gcc-5-branch/gcc/cp/ChangeLog
branches/gcc-5-branch/gcc/cp/tree.c
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
` (9 preceding siblings ...)
2015-06-17 14:33 ` jason at gcc dot gnu.org
@ 2015-06-21 9:06 ` ville.voutilainen at gmail dot com
2015-08-18 14:44 ` jason at gcc dot gnu.org
11 siblings, 0 replies; 13+ messages in thread
From: ville.voutilainen at gmail dot com @ 2015-06-21 9:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ville.voutilainen at gmail dot com
--- Comment #15 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
*** Bug 61856 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/58063] default arguments evaluated twice per call
2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
` (10 preceding siblings ...)
2015-06-21 9:06 ` ville.voutilainen at gmail dot com
@ 2015-08-18 14:44 ` jason at gcc dot gnu.org
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2015-08-18 14:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58063
--- Comment #16 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Tue Aug 18 14:43:38 2015
New Revision: 226973
URL: https://gcc.gnu.org/viewcvs?rev=226973&root=gcc&view=rev
Log:
PR c++/58063
* tree.c (bot_manip): Remap SAVE_EXPR.
Added:
branches/gcc-4_9-branch/gcc/testsuite/g++.dg/overload/defarg10.C
Modified:
branches/gcc-4_9-branch/gcc/cp/ChangeLog
branches/gcc-4_9-branch/gcc/cp/tree.c
^ permalink raw reply [flat|nested] 13+ messages in thread
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2013-08-02 20:38 [Bug c++/58063] New: default arguments evaluated twice per call plokinom at gmail dot com
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2013-08-03 20:48 ` daniel.kruegler at googlemail dot com
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