* [Bug c++/63506] GCC deduces wrong return type of operator*() inside template functions
2014-10-10 14:02 [Bug c++/63506] New: GCC deduces wrong return type of operator*() inside template functions steffen.muething at iwr dot uni-heidelberg.de
@ 2014-10-10 14:03 ` steffen.muething at iwr dot uni-heidelberg.de
2014-10-10 14:27 ` steffen.muething at iwr dot uni-heidelberg.de
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: steffen.muething at iwr dot uni-heidelberg.de @ 2014-10-10 14:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63506
--- Comment #1 from Steffen Müthing <steffen.muething at iwr dot uni-heidelberg.de> ---
I forgot to mention: This problem is specific to operator*(). If you add an
equivalent normal member function and replace the dereferencing operations with
calls to that function, the problem does not occur.
>From gcc-bugs-return-463761-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 10 14:19:50 2014
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From: "glisse at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/63506] GCC deduces wrong return type of operator*() inside template functions
Date: Fri, 10 Oct 2014 14:19:00 -0000
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--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Do you mean decltype(*it) (without the extra parentheses) everywhere?
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/63506] GCC deduces wrong return type of operator*() inside template functions
2014-10-10 14:02 [Bug c++/63506] New: GCC deduces wrong return type of operator*() inside template functions steffen.muething at iwr dot uni-heidelberg.de
2014-10-10 14:03 ` [Bug c++/63506] " steffen.muething at iwr dot uni-heidelberg.de
@ 2014-10-10 14:27 ` steffen.muething at iwr dot uni-heidelberg.de
2014-10-11 9:58 ` daniel.kruegler at googlemail dot com
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: steffen.muething at iwr dot uni-heidelberg.de @ 2014-10-10 14:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63506
--- Comment #3 from Steffen Müthing <steffen.muething at iwr dot uni-heidelberg.de> ---
Ooops, yes, I did. Actually I meant to write decltype(*iterator()), but
decltype(*it()) doesn't make sense, of course.
And to avoid further confusion: The function get() in the iterator is just
there as an example for a function that avoids the problem (see comment #1).
>From gcc-bugs-return-463766-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 10 14:32:01 2014
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/54488] tree loop invariant motion uses an excessive amount of memory
Date: Fri, 10 Oct 2014 14:32:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I had patches to implement the suggestion, work on outermost loops separately.
Of course it won't help once you wrap all of them in a single outer loop
(which is why I didn't end up committing this).
Re-measuring state of current trunk would be still nice (I think we must
have improved over the 1GB).
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/63506] GCC deduces wrong return type of operator*() inside template functions
2014-10-10 14:02 [Bug c++/63506] New: GCC deduces wrong return type of operator*() inside template functions steffen.muething at iwr dot uni-heidelberg.de
2014-10-10 14:03 ` [Bug c++/63506] " steffen.muething at iwr dot uni-heidelberg.de
2014-10-10 14:27 ` steffen.muething at iwr dot uni-heidelberg.de
@ 2014-10-11 9:58 ` daniel.kruegler at googlemail dot com
2014-10-13 10:02 ` steffen.muething at iwr dot uni-heidelberg.de
2014-12-19 13:51 ` ville.voutilainen at gmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2014-10-11 9:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63506
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |daniel.kruegler@googlemail.
| |com
--- Comment #4 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
Here is a complete example demonstrating the problem, which is also present in
gcc 5.0.0 20141010 (experimental):
//-------------------------------
struct proxy {};
struct iterator
{
proxy operator*() { return proxy(); }
};
//#define DEACTIVATE
#ifndef DEACTIVATE
template<typename T = int>
#endif
void foo(iterator it)
{
auto&& x = *it;
}
int main()
{
iterator it;
foo(it);
}
//-------------------------------
>From gcc-bugs-return-463828-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Oct 11 10:03:42 2014
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From: "daniel.kruegler at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/63508] ICE when using bracketed initializer on pointer to member function of a templated class
Date: Sat, 11 Oct 2014 10:03:00 -0000
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Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |daniel.kruegler@googlemail.
| |com
--- Comment #2 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
The ICE also occurs in gcc HEAD 5.0.0 20141010 (experimental):
<quote>
prog.cc: In instantiation of 'c<T>::c() [with T = int]':
prog.cc:14:23: required from here
prog.cc:7:22: internal compiler error: Segmentation fault
auto x = m{&c::mf};
^
0x9af2bf crash_signal
/home/heads/gcc/gcc-source/gcc/toplev.c:340
0x55be89 extend_ref_init_temps(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**)
/home/heads/gcc/gcc-source/gcc/cp/call.c:9710
0x55befb extend_ref_init_temps(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**)
/home/heads/gcc/gcc-source/gcc/cp/call.c:9732
0x5aaa15 store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
/home/heads/gcc/gcc-source/gcc/cp/typeck2.c:792
0x56f0a5 check_initializer /home/heads/gcc/gcc-source/gcc/cp/decl.c:5892
0x580e9c cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
/home/heads/gcc/gcc-source/gcc/cp/decl.c:6517
0x59071e tsubst_expr
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13788
0x58fe05 tsubst_expr
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13862
0x58f6e4 tsubst_expr
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13676
0x58fe05 tsubst_expr
/home/heads/gcc/gcc-source/gcc/cp/pt.c:13862
0x58ea74 instantiate_decl(tree_node*, int, bool)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:20241
0x5a813b instantiate_pending_templates(int)
/home/heads/gcc/gcc-source/gcc/cp/pt.c:20357
0x5c14d8 cp_write_global_declarations()
/home/heads/gcc/gcc-source/gcc/cp/decl2.c:4367
Please submit a full bug report, with preprocessed source if appropriate.
Please include the complete backtrace with any bug report. See
<http://gcc.gnu.org/bugs.html> for instructions.
</quote>
>From gcc-bugs-return-463829-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Oct 11 11:21:02 2014
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Subject: [Bug other/33702] [meta-bug] GCC 4.4 pending patches
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Bug 33702 depends on bug 17843, which changed state.
Bug 17843 Summary: Warning not given for unreachable code in a switch
https://gcc.gnu.org/bugzilla/show_bug.cgi?id\x17843
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/63506] GCC deduces wrong return type of operator*() inside template functions
2014-10-10 14:02 [Bug c++/63506] New: GCC deduces wrong return type of operator*() inside template functions steffen.muething at iwr dot uni-heidelberg.de
` (2 preceding siblings ...)
2014-10-11 9:58 ` daniel.kruegler at googlemail dot com
@ 2014-10-13 10:02 ` steffen.muething at iwr dot uni-heidelberg.de
2014-12-19 13:51 ` ville.voutilainen at gmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: steffen.muething at iwr dot uni-heidelberg.de @ 2014-10-13 10:02 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63506
--- Comment #5 from Steffen Müthing <steffen.muething at iwr dot uni-heidelberg.de> ---
The exact same problem is present on operator[] :
//-------------------------------
struct proxy {};
struct iterator
{
proxy operator*() { return proxy(); }
proxy operator[](int i) { return proxy(); }
};
//#define DEACTIVATE
#ifndef DEACTIVATE
template<typename T = int>
#endif
void foo(iterator it)
{
auto&& x = *it;
auto&& y = it[1];
}
int main()
{
iterator it;
foo(it);
}
//-------------------------------
>From gcc-bugs-return-463910-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 13 10:20:49 2014
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From: "lucdanton at free dot fr" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/63522] New: [4.8/4.9/5.0] ICE: unexpected expression 'ElementIndices' of kind template_parm_index
Date: Mon, 13 Oct 2014 10:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idc522
Bug ID: 63522
Summary: [4.8/4.9/5.0] ICE: unexpected expression
'ElementIndices' of kind template_parm_index
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lucdanton at free dot fr
Created attachment 33696
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id3696&actioníit
Minimal testcase
Attempting to compile the minimal testcase produces "internal compiler error:
unexpected expression 'ElementIndices' of kind template_parm_index". I have
tried the following versions:
$ g++-trunk --version
g++-trunk (GCC) 5.0.0 20141009 (experimental)
$ g++ --version
g++ (Ubuntu 4.8.2-19ubuntu1) 4.8.2
$ g++-4.9
g++-4.9 (GCC) 4.9.0
Program fragment:
--------------------
template <typename...> struct tuple;
template <typename...> void slice();
template <int Index, typename...> using slice_result = decltype(slice<Index>);
template <typename Tuple, typename... Tuples, int... ElementIndices,
typename typename tuple<slice_result<ElementIndices, Tuples...>,
slice_result<ElementIndices, Tuples...>...>::type>
void zip_with(Tuple...);
decltype(zip_with(0))
----------------------------------------
Here is the full invocation and error using the snapshot of trunk:
$ g++-trunk -std=c++11 main.cpp
main.cpp: In substitution of 'template<int Index, class ...> using slice_result
= decltype (slice<Index>) [with int Index = ElementIndices;
<template-parameter-1-2> = {}]':
main.cpp:5:11: required by substitution of 'template<class Tuple, class ...
Tuples, int ...ElementIndices, class> void zip_with(Tuple, ...) [with Tuple int; Tuples = {}; int ...ElementIndices = {}; <template-parameter-1-4> <missing>]'
main.cpp:9:20: required from here
main.cpp:5:11: internal compiler error: unexpected expression 'ElementIndices'
of kind template_parm_index
typename ^
0x6755a7 cxx_eval_constant_expression
../../gcc/gcc/cp/semantics.c:10050
0x676de6 cxx_eval_outermost_constant_expr
../../gcc/gcc/cp/semantics.c:10070
0x5dd190 convert_nontype_argument
../../gcc/gcc/cp/pt.c:5759
0x5dd190 convert_template_argument
../../gcc/gcc/cp/pt.c:6657
0x5deb5c coerce_template_parms
../../gcc/gcc/cp/pt.c:7081
0x5daa28 coerce_innermost_template_parms
../../gcc/gcc/cp/pt.c:7165
0x5daa28 instantiate_alias_template
../../gcc/gcc/cp/pt.c:15909
0x5daa28 tsubst(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.c:11723
0x5de392 tsubst_template_args
../../gcc/gcc/cp/pt.c:10123
0x5de58f tsubst_template_args
../../gcc/gcc/cp/pt.c:10105
0x5e09d0 tsubst_aggr_type
../../gcc/gcc/cp/pt.c:10320
0x5da0cf tsubst(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.c:12299
0x5e4125 type_unification_real
../../gcc/gcc/cp/pt.c:16841
0x5e741f fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, bool, bool)
../../gcc/gcc/cp/pt.c:16177
0x5a5ca8 add_template_candidate_real
../../gcc/gcc/cp/call.c:3025
0x5a6371 add_template_candidate
../../gcc/gcc/cp/call.c:3122
0x5a6371 add_candidates
../../gcc/gcc/cp/call.c:5253
0x5a797d perform_overload_resolution
../../gcc/gcc/cp/call.c:3971
0x5a93ea build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, bool, int)
../../gcc/gcc/cp/call.c:4048
0x66ce39 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
../../gcc/gcc/cp/semantics.c:2368
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/63506] GCC deduces wrong return type of operator*() inside template functions
2014-10-10 14:02 [Bug c++/63506] New: GCC deduces wrong return type of operator*() inside template functions steffen.muething at iwr dot uni-heidelberg.de
` (3 preceding siblings ...)
2014-10-13 10:02 ` steffen.muething at iwr dot uni-heidelberg.de
@ 2014-12-19 13:51 ` ville.voutilainen at gmail dot com
4 siblings, 0 replies; 6+ messages in thread
From: ville.voutilainen at gmail dot com @ 2014-12-19 13:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63506
Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2014-12-19
CC| |ville.voutilainen at gmail dot com
Ever confirmed|0 |1
Known to fail| |5.0
--- Comment #6 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Clang accepts the code with or without DEACTIVATE defined.
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