[Bug translator/14396] New: Missing DW_ATE_UTF support (char16_t, char32_t)

[Bug translator/14396] New: Missing DW_ATE_UTF support (char16_t, char32_t)

[mjw at redhat dot com]

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)

[jistone at redhat dot com]

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)

[jistone at redhat dot com]

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)

[jistone at redhat dot com]

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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