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* [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary
@ 2013-02-07 10:37 ed at catmur dot co.uk
2013-02-07 11:47 ` [Bug c++/56239] [4.6/4.7/4.8 Regression] " jakub at gcc dot gnu.org
` (8 more replies)
0 siblings, 9 replies; 10+ messages in thread
From: ed at catmur dot co.uk @ 2013-02-07 10:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
Bug #: 56239
Summary: parse error calling operator() on parenthesized
value-initialized temporary
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: ed@catmur.co.uk
From
http://stackoverflow.com/questions/14732132/global-initialization-with-temporary-function-object
Under gcc 4.8.0 (20130127):
struct S { int operator()(); };
int main() { (S())(); }
source.cpp:2:20: error: expected primary-expression before ')' token
int main() { (S())(); }
^
Motivation for parenthesizing the temporary is to use it in a constructor call:
struct S { int operator()(); };
struct T { T(int); };
int main() { T t((S())()); }
source.cpp:3:24: error: expected primary-expression before ')' token
int main() { T t((S())()); }
^
It appears that gcc is parsing the expression (S())() using production 5.4p2:
cast-expression:
unary-expression
( type-id ) cast-expression
Since an empty pair of parentheses is not a cast-expression, this should
instead be parsed using 5.2p1:
postfix-expression:
[...]
postfix-expression ( expression-list[opt] )
[...]
where the postfix-expression is (S()) and the expression-list is omitted.
Same error occurs in both C++03 and C++11 mode.
icc 13.0.1 has the same issue; clang 3.2 compiles it successfully.
Two workarounds are available: enclose (S()) in an extra pair of parentheses,
or use C++11 universal initialization syntax.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/56239] [4.6/4.7/4.8 Regression] parse error calling operator() on parenthesized value-initialized temporary
2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
@ 2013-02-07 11:47 ` jakub at gcc dot gnu.org
2013-02-07 12:00 ` paolo.carlini at oracle dot com
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-07 11:47 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-02-07
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |4.6.4
Summary|parse error calling |[4.6/4.7/4.8 Regression]
|operator() on parenthesized |parse error calling
|value-initialized temporary |operator() on parenthesized
| |value-initialized temporary
Ever Confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-07 11:46:37 UTC ---
Started with http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=141429
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/56239] [4.6/4.7/4.8 Regression] parse error calling operator() on parenthesized value-initialized temporary
2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
2013-02-07 11:47 ` [Bug c++/56239] [4.6/4.7/4.8 Regression] " jakub at gcc dot gnu.org
@ 2013-02-07 12:00 ` paolo.carlini at oracle dot com
2013-02-07 13:15 ` jakub at gcc dot gnu.org
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: paolo.carlini at oracle dot com @ 2013-02-07 12:00 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |manu at gcc dot gnu.org
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-02-07 11:59:32 UTC ---
Let's add Manuel in CC.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/56239] [4.6/4.7/4.8 Regression] parse error calling operator() on parenthesized value-initialized temporary
2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
2013-02-07 11:47 ` [Bug c++/56239] [4.6/4.7/4.8 Regression] " jakub at gcc dot gnu.org
2013-02-07 12:00 ` paolo.carlini at oracle dot com
@ 2013-02-07 13:15 ` jakub at gcc dot gnu.org
2013-02-07 15:03 ` jason at gcc dot gnu.org
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-07 13:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-07 13:14:12 UTC ---
Created attachment 29384
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29384
gcc48-pr56239.patch
If () is the only problem, then it can be fixed e.g. by the following patch
(untested so far, except for make -C gcc check-g++).
BTW, I wonder where the standard resolves the ambiguity between parsing it as a
function call with parenthesized ctor and between a cast. For zero operands it
is not ambiguous, but if there is one or more operands, apparently it should be
parsed as cast, but I haven't found where the standard says so.
struct S { int operator()(int, int); };
int main() { (S())(1, 2); }
//int main() { S s; s(1, 2); }
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/56239] [4.6/4.7/4.8 Regression] parse error calling operator() on parenthesized value-initialized temporary
2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
` (2 preceding siblings ...)
2013-02-07 13:15 ` jakub at gcc dot gnu.org
@ 2013-02-07 15:03 ` jason at gcc dot gnu.org
2013-02-07 17:51 ` jakub at gcc dot gnu.org
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jason at gcc dot gnu.org @ 2013-02-07 15:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2013-02-07 15:02:53 UTC ---
(In reply to comment #3)
> gcc48-pr56239.patch
OK.
> BTW, I wonder where the standard resolves the ambiguity between parsing it as a
> function call with parenthesized ctor and between a cast.
8.2/2:
The ambiguity arising from the similarity between a function-style cast and a
type-id can occur in different contexts. The ambiguity appears as a choice
between a function-style cast expression and a declaration of a type. The
resolution is that any construct that could possibly be a type-id in its
syntactic context shall be considered a type-id.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/56239] [4.6/4.7/4.8 Regression] parse error calling operator() on parenthesized value-initialized temporary
2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
` (3 preceding siblings ...)
2013-02-07 15:03 ` jason at gcc dot gnu.org
@ 2013-02-07 17:51 ` jakub at gcc dot gnu.org
2013-02-07 17:55 ` [Bug c++/56239] [4.6/4.7 " jakub at gcc dot gnu.org
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-07 17:51 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-07 17:50:15 UTC ---
Author: jakub
Date: Thu Feb 7 17:49:59 2013
New Revision: 195859
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=195859
Log:
PR c++/56239
* parser.c (cp_parser_token_starts_cast_expression): Renamed to...
(cp_parser_tokens_start_cast_expression): ... this. Change parameter
to cp_parser *, call cp_lexer_peek_token first. For CPP_OPEN_PAREN,
return true only if 2nd token isn't CPP_CLOSE_PAREN.
(cp_parser_cast_expression): Adjust caller.
* g++.dg/parse/pr56239.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/parse/pr56239.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/56239] [4.6/4.7 Regression] parse error calling operator() on parenthesized value-initialized temporary
2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
` (4 preceding siblings ...)
2013-02-07 17:51 ` jakub at gcc dot gnu.org
@ 2013-02-07 17:55 ` jakub at gcc dot gnu.org
2013-02-19 17:23 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-07 17:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Known to work| |4.8.0
AssignedTo|unassigned at gcc dot |jakub at gcc dot gnu.org
|gnu.org |
Summary|[4.6/4.7/4.8 Regression] |[4.6/4.7 Regression] parse
|parse error calling |error calling operator() on
|operator() on parenthesized |parenthesized
|value-initialized temporary |value-initialized temporary
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-07 17:54:11 UTC ---
Fixed on the trunk so far.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/56239] [4.6/4.7 Regression] parse error calling operator() on parenthesized value-initialized temporary
2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
` (5 preceding siblings ...)
2013-02-07 17:55 ` [Bug c++/56239] [4.6/4.7 " jakub at gcc dot gnu.org
@ 2013-02-19 17:23 ` jakub at gcc dot gnu.org
2013-02-19 17:40 ` [Bug c++/56239] [4.6 " jakub at gcc dot gnu.org
2013-04-03 18:21 ` jakub at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-19 17:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-19 17:22:51 UTC ---
Author: jakub
Date: Tue Feb 19 17:22:43 2013
New Revision: 196145
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=196145
Log:
Backported from mainline
2013-02-07 Jakub Jelinek <jakub@redhat.com>
PR c++/56239
* parser.c (cp_parser_token_starts_cast_expression): Renamed to...
(cp_parser_tokens_start_cast_expression): ... this. Change parameter
to cp_parser *, call cp_lexer_peek_token first. For CPP_OPEN_PAREN,
return true only if 2nd token isn't CPP_CLOSE_PAREN.
(cp_parser_cast_expression): Adjust caller.
* g++.dg/parse/pr56239.C: New test.
Added:
branches/gcc-4_7-branch/gcc/testsuite/g++.dg/parse/pr56239.C
Modified:
branches/gcc-4_7-branch/gcc/cp/ChangeLog
branches/gcc-4_7-branch/gcc/cp/parser.c
branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/56239] [4.6 Regression] parse error calling operator() on parenthesized value-initialized temporary
2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
` (6 preceding siblings ...)
2013-02-19 17:23 ` jakub at gcc dot gnu.org
@ 2013-02-19 17:40 ` jakub at gcc dot gnu.org
2013-04-03 18:21 ` jakub at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-02-19 17:40 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[4.6/4.7 Regression] parse |[4.6 Regression] parse
|error calling operator() on |error calling operator() on
|parenthesized |parenthesized
|value-initialized temporary |value-initialized temporary
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-02-19 17:39:42 UTC ---
Fixed for 4.7.3+.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/56239] [4.6 Regression] parse error calling operator() on parenthesized value-initialized temporary
2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
` (7 preceding siblings ...)
2013-02-19 17:40 ` [Bug c++/56239] [4.6 " jakub at gcc dot gnu.org
@ 2013-04-03 18:21 ` jakub at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-04-03 18:21 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56239
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-04-03 18:21:16 UTC ---
Author: jakub
Date: Wed Apr 3 18:04:07 2013
New Revision: 197450
URL: http://gcc.gnu.org/viewcvs?rev=197450&root=gcc&view=rev
Log:
Backported from mainline
2013-02-07 Jakub Jelinek <jakub@redhat.com>
PR c++/56239
* parser.c (cp_parser_token_starts_cast_expression): Renamed to...
(cp_parser_tokens_start_cast_expression): ... this. Change parameter
to cp_parser *, call cp_lexer_peek_token first. For CPP_OPEN_PAREN,
return true only if 2nd token isn't CPP_CLOSE_PAREN.
(cp_parser_cast_expression): Adjust caller.
* g++.dg/parse/pr56239.C: New test.
Added:
branches/gcc-4_6-branch/gcc/testsuite/g++.dg/parse/pr56239.C
Modified:
branches/gcc-4_6-branch/gcc/cp/ChangeLog
branches/gcc-4_6-branch/gcc/cp/parser.c
branches/gcc-4_6-branch/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 10+ messages in thread
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2013-02-07 10:37 [Bug c++/56239] New: parse error calling operator() on parenthesized value-initialized temporary ed at catmur dot co.uk
2013-02-07 11:47 ` [Bug c++/56239] [4.6/4.7/4.8 Regression] " jakub at gcc dot gnu.org
2013-02-07 12:00 ` paolo.carlini at oracle dot com
2013-02-07 13:15 ` jakub at gcc dot gnu.org
2013-02-07 15:03 ` jason at gcc dot gnu.org
2013-02-07 17:51 ` jakub at gcc dot gnu.org
2013-02-07 17:55 ` [Bug c++/56239] [4.6/4.7 " jakub at gcc dot gnu.org
2013-02-19 17:23 ` jakub at gcc dot gnu.org
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