[Bug c++/56123] Union bitfield corruption
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56123 Tim Janik changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution||INVALID --- Comment #2 from Tim Janik 2013-01-28 01:39:40 UTC --- Thanks for the quick answer Jon, you're right indeed, from the C99 spec: > If insufficient space remains, whether a bit-field that does not fit is put > into the next unit or overlaps adjacent units is implementation-defined.
[Bug libstdc++/55911] Segfault in unordered_map with max_load_factor > 1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55911
--- Comment #7 from Tim Janik 2013-01-28 01:13:04 UTC ---
(In reply to comment #4)
> Debug Mode even catches it:
>
> unordered_map:max_size: 576460752303423487
> unordered_map:size: 10352716
> unordered_map:bucket_count: 218971
> unordered_map: load_factor: 47.278938
> unordered_map: max_load_factor: 50.00
> /home/wakelj/tools/Linux-f12-x86_64/4.8/include/c++/4.8.0/debug/unordered_map:229:
> error: attempt to access container with out-of-bounds bucket index
> 218971, container only holds 218971 buckets.
>
> Objects involved in the operation:
> sequence "this" @ 0x0x7fffd8ae2810 {
> type = NSt7__debug13unordered_mapIld11HashPtrdiffSt8equal_toIlESaIlEEE;
> }
> Aborted (core dumped)
Thanks, I'm impressed to see that.
How did you get that message? Just using g++-4.7 -D_GLIBCXX_DEBUG still gives
me the segfault.
[Bug c++/56123] New: Union bitfield corruption
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56123
Bug #: 56123
Summary: Union bitfield corruption
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: t...@gtk.org
Created attachment 29287
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29287
test case with assertion triggered
In this union
union {
size_t vsize;
struct {
uint field24 : 24;
uint unused : 24;
uint field16 : 16;
};
};
"field16" accesses are mismangled, depending on wether "unused" has 24 bits or
is split into two 8+16 components.
Test case is attached, test it with and without -DNOBUG.
Occours on a 64bit platform with g++-4.6 and 4.7:
$ g++-4.7 --version
g++-4.7 (Ubuntu/Linaro 4.7.2-11precise2) 4.7.2
$ uname -a
Linux jumper 3.2.0-36-generic #57-Ubuntu SMP Tue Jan 8 21:44:52 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux
[Bug libstdc++/55911] New: Segfault in unordered_map with max_load_factor > 1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55911 Bug #: 55911 Summary: Segfault in unordered_map with max_load_factor > 1 Classification: Unclassified Product: gcc Version: 4.7.2 Status: UNCONFIRMED Severity: major Priority: P3 Component: libstdc++ AssignedTo: unassig...@gcc.gnu.org ReportedBy: t...@gtk.org Created attachment 29114 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29114 C++11 unordered_map segfault example The attached test program segfaults when compiled and executed with the following g++ versions: g++-4.7 (Ubuntu/Linaro 4.7.2-11precise2) 4.7.2 g++-4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3 The program inserts values into an unordered_map and iterates over it's bucket stats. Removing the line > pmap.max_load_factor (50); does not cause a segfault. Example output: $ g++ -g -Wall -O2 -std=gnu++0x -pthread umap-bug.cc && dbg ./a.out unordered_map:max_size: 768614336404564650 unordered_map:size: 10352716 unordered_map:bucket_count: 218971 unordered_map: load_factor: 47.278938 unordered_map: max_load_factor: 50.00 Program received signal SIGSEGV, Segmentation fault. __distance, false, false> > (__last=..., __first=...) at /usr/include/c++/4.6/bits/stl_iterator_base_funcs.h:82 82++__first; (gdb) bt #0 __distance, false, false> > (__last=..., __first=...) at /usr/include/c++/4.6/bits/stl_iterator_base_funcs.h:82 #1 distance, false, false> > (__last=..., __first=...) at /usr/include/c++/4.6/bits/stl_iterator_base_funcs.h:117 #2 bucket_size (__n=218971, this=0x7fffde30) at /usr/include/c++/4.6/bits/hashtable.h:299 #3 unordered_map_bucket_stats > (umap=...) at umap-bug.cc:16 #4 main (argc=, argv=) at umap-bug.cc:55
[Bug c++/50456] New: attributes ignored on member templates
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50456
Bug #: 50456
Summary: attributes ignored on member templates
Classification: Unclassified
Product: gcc
Version: 4.5.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: t...@gtk.org
Decorating a member template with __attribute__((error)) should trigger
compiler errors like declaring regular methods does. (A similar bug exists
about __attribute__((warning))).
Example code:
template struct Object;
template<> struct Object {
template static void
should_error (A a)
__attribute__ ((error ("Calling this function should trigger a compiler
error")))
;
};
int main (int argc, char *argv[]) {
typedef Object FloatObject;
FloatObject::should_error (7);
return 0;
}
// g++ -Wall -O2 x.cc && ./a.out
Actual result:
x.cc:(.text+0xa): undefined reference to `void
Object::should_error(int)'
Expected result:
x.cc:10: error: call to ‘Object::should_error’ declared with attribute
error: Calling this function should trigger a compiler error
Observed with g++-4.4 and g++-4.5 (Ubuntu/Linaro 4.5.1-7ubuntu2) 4.5.1.
[Bug c++/34750] ICE in fold_convert, at fold-const.c:1955
--- Comment #1 from timj at gtk dot org 2008-01-12 15:34 --- Created an attachment (id=14929) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14929&action=view) compressed C++ preprocessor output the preprocessed code was spewed out by gcc in the middle of development, it is not meant to do anything sensible. line directives have been stripped and it was compressed with bzip2 to avoid inflating bugzilla with 3MB preprocessor blobs. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34750
[Bug c++/34750] New: ICE in fold_convert, at fold-const.c:1955
compiling gccfolderr.cc like this: g++-4.1 -g -Wall -Wdeprecated -Wno-cast-qual -pipe -O2 -ftracer \ -finline-functions -fno-keep-static-consts gccfolderr.cc yields: gccfolderr.cc: In function void::test_array(): gccfolderr.cc:34571: internal compiler error: in fold_convert, at \ fold-const.c:1955 compiling it without options still results in an ICE: g++-4.1 gccfolderr.cc albeit a different one: gccfolderr.cc:34571: internal compiler error: in cp_expr_size, at \ cp/cp-objcp-common.c:101 gcc version details (etch x86): $ g++-4.1 --version g++-4.1 (GCC) 4.1.2 20061115 (prerelease) (Debian 4.1.1-21) compressed preprocessor file follows. -- Summary: ICE in fold_convert, at fold-const.c:1955 Product: gcc Version: 4.1.2 Status: UNCONFIRMED Severity: major Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: timj at gtk dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34750
[Bug c++/30894] ICE in splice_child_die, at dwarf2out.c:5503
--- Comment #1 from timj at gtk dot org 2007-02-20 20:32 --- Created an attachment (id=13077) --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13077&action=view) source code triggering ICE, use TRIGGER_ICE to toggle triggering -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30894
[Bug c++/30894] New: ICE in splice_child_die, at dwarf2out.c:5503
some C++ code in a project of mine triggers an ICE in various g++ versions: $ g++-4.1 -g -Wall -Wdeprecated -Wno-cast-qual -pipe -O2 -ftracer finline-functions -fno-keep-static-consts -fPIC -DPIC -c xice-uma.cc xice-uma.cc:71: internal compiler error: in splice_child_die, at dwarf2out.c:5503 Please submit a full bug report,... $ g++-4.1 --version g++-4.1 (GCC) 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5) $ uname -a Linux cruncher 2.6.17-10-generic #2 SMP Tue Dec 5 22:28:26 UTC 2006 i686 GNU/Linux $ g++-4.0 xice-uma.cc xice-uma.cc: In member function const AutoLocker::Locker* AutoLocker::locker() const: xice-uma.cc:97: internal compiler error: Segmentation fault $ g++-3.4 xice-uma.cc xice-uma.cc: In member function `const AutoLocker::Locker* AutoLocker::locker() const': xice-uma.cc:97: internal compiler error: Segmentation fault $ g++-3.3 xice-uma.cc xice-uma.cc: In member function `const AutoLocker::Locker* AutoLocker::locker() const': xice-uma.cc:97: internal compiler error: Segmentation fault i managed to shrink this down to a may_alias attribute on a union, source code follows as xice-uma.cc. -- Summary: ICE in splice_child_die, at dwarf2out.c:5503 Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: timj at gtk dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30894
[Bug c++/27270] New: ICE in process_init_constructor_array, at cp/typeck2.c:788
with a recent gcc snapshot on i386:
c++ (GCC) 4.2.0 20060325 (experimental)
the following tst program program:
template
struct Array {
Entry *array[32];
Array () :
array ( (Entry*[1]) { 0, 0 } )
{}
};
Array a;
compiled with:
c++ -Wall arrayinit.cc
produces:
arrayinit.cc: In constructor 'Array::Array() [with Entry = void*]':
arrayinit.cc:8: instantiated from here
arrayinit.cc:5: internal compiler error: in process_init_constructor_array, at
cp/typeck2.c:788
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gcc.gnu.org/bugs.html> for instructions.
--
Summary: ICE in process_init_constructor_array, at
cp/typeck2.c:788
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: timj at gtk dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27270
