* [Bug translator/14396] New: Missing DW_ATE_UTF support (char16_t, char32_t)
@ 2012-07-24 22:26 mjw at redhat dot com
2012-07-24 22:39 ` [Bug translator/14396] " jistone at redhat dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: mjw at redhat dot com @ 2012-07-24 22:26 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=14396
Bug #: 14396
Summary: Missing DW_ATE_UTF support (char16_t, char32_t)
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
AssignedTo: systemtap@sourceware.org
ReportedBy: mjw@redhat.com
Classification: Unclassified
elfutils dwarf.h was missing the new DWARF4 DW_ATE_UTF define.
So systemtap also doesn't support this this data encoding.
Example usage:
#include <string.h>
const char *foo = "cow";
const char16_t *bar = u"bear";
int
main ()
{
if (foo == "bear" && bar == u"cow")
return 42;
return 0;
}
$ g++ -g -std=c++0x -o utf utf.cxx
$ stap -e 'probe process.function("main") { log($foo$$); log($bar$$) }' -c
./utf
"cow"
4195852
Would be nice to see the $bar value also decoded.
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* [Bug translator/14396] Missing DW_ATE_UTF support (char16_t, char32_t)
2012-07-24 22:26 [Bug translator/14396] New: Missing DW_ATE_UTF support (char16_t, char32_t) mjw at redhat dot com
@ 2012-07-24 22:39 ` jistone at redhat dot com
2012-08-10 0:56 ` jistone at redhat dot com
2012-08-11 1:04 ` jistone at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: jistone at redhat dot com @ 2012-07-24 22:39 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=14396
Josh Stone <jistone at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jistone at redhat dot com
--- Comment #1 from Josh Stone <jistone at redhat dot com> 2012-07-24 22:39:36 UTC ---
(In reply to comment #0)
> $ stap -e 'probe process.function("main") { log($foo$$); log($bar$$) }' -c
> ./utf
> "cow"
> 4195852
>
> Would be nice to see the $bar value also decoded.
dwarf_pretty_print::print_chars() uses user_string2/kernel_string2 to read
strings bytewise. We could add similar functions for UTF-16 and UTF-32 which
convert to UTF-8 to make stap strings.
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* [Bug translator/14396] Missing DW_ATE_UTF support (char16_t, char32_t)
2012-07-24 22:26 [Bug translator/14396] New: Missing DW_ATE_UTF support (char16_t, char32_t) mjw at redhat dot com
2012-07-24 22:39 ` [Bug translator/14396] " jistone at redhat dot com
@ 2012-08-10 0:56 ` jistone at redhat dot com
2012-08-11 1:04 ` jistone at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: jistone at redhat dot com @ 2012-08-10 0:56 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=14396
--- Comment #2 from Josh Stone <jistone at redhat dot com> 2012-08-10 00:56:21 UTC ---
Created attachment 6570
--> http://sourceware.org/bugzilla/attachment.cgi?id=6570
Add kernel_string_utf16/32
Here's a prototype of what those conversion functions might look like for
kernel memory. The user variants would be the same, just s/kread/uread/.
(And now I see that uread() doesn't exist, but it should...)
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* [Bug translator/14396] Missing DW_ATE_UTF support (char16_t, char32_t)
2012-07-24 22:26 [Bug translator/14396] New: Missing DW_ATE_UTF support (char16_t, char32_t) mjw at redhat dot com
2012-07-24 22:39 ` [Bug translator/14396] " jistone at redhat dot com
2012-08-10 0:56 ` jistone at redhat dot com
@ 2012-08-11 1:04 ` jistone at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: jistone at redhat dot com @ 2012-08-11 1:04 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=14396
Josh Stone <jistone at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #3 from Josh Stone <jistone at redhat dot com> 2012-08-11 01:04:22 UTC ---
15ceae2 loc2c-runtime.h: Add uread() and uwrite()
8987b30 PR14396: Add UTF-16/32 conversion functions
6561d8d PR14396: Add pretty-printing support for UTF
$ stap -e 'probe process.function("main") { log($foo$); log($bar$) }' -c ./utf
"cow"
"bear"
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2012-07-24 22:26 [Bug translator/14396] New: Missing DW_ATE_UTF support (char16_t, char32_t) mjw at redhat dot com
2012-07-24 22:39 ` [Bug translator/14396] " jistone at redhat dot com
2012-08-10 0:56 ` jistone at redhat dot com
2012-08-11 1:04 ` jistone at redhat dot com
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