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* [Bug fortran/10154] GDB 6.6 won't display XMM registers: <error reading variable>
[not found] <bug-10154-4717@http.sourceware.org/bugzilla/>
@ 2011-06-27 17:01 ` tromey at redhat dot com
0 siblings, 0 replies; 4+ messages in thread
From: tromey at redhat dot com @ 2011-06-27 17:01 UTC (permalink / raw)
To: gdb-prs
http://sourceware.org/bugzilla/show_bug.cgi?id=10154
Tom Tromey <tromey at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |tromey at redhat dot com
Resolution| |FIXED
--- Comment #7 from Tom Tromey <tromey at redhat dot com> 2011-06-27 17:01:28 UTC ---
Reported as fixed.
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* [Bug fortran/10154] GDB 6.6 won't display XMM registers: <error reading variable>
2009-05-14 23:32 [Bug mi/10154] New: " jim dot conyngham at amd dot com
2009-05-18 17:32 ` [Bug fortran/10154] " jim dot conyngham at amd dot com
2009-05-18 18:08 ` jim dot conyngham at amd dot com
@ 2009-05-19 16:02 ` jim dot conyngham at amd dot com
2 siblings, 0 replies; 4+ messages in thread
From: jim dot conyngham at amd dot com @ 2009-05-19 16:02 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From jim dot conyngham at amd dot com 2009-05-19 16:02 -------
Apparently this is fixed in the current sources.
The version 6.8 that I downloaded from ftp.gnu.org/gnu/gdb was packed up 27
March 2008. The changelogs in the current sources indicate that support for
TYPE_CODE_UNION was added to f-valprint.c in April 2008.
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* [Bug fortran/10154] GDB 6.6 won't display XMM registers: <error reading variable>
2009-05-14 23:32 [Bug mi/10154] New: " jim dot conyngham at amd dot com
2009-05-18 17:32 ` [Bug fortran/10154] " jim dot conyngham at amd dot com
@ 2009-05-18 18:08 ` jim dot conyngham at amd dot com
2009-05-19 16:02 ` jim dot conyngham at amd dot com
2 siblings, 0 replies; 4+ messages in thread
From: jim dot conyngham at amd dot com @ 2009-05-18 18:08 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From jim dot conyngham at amd dot com 2009-05-18 18:08 -------
Sorry for the confusion -- I did not realize at first that this issue was
specific to Fortran source programs.
After more investigation, and debugging with the GDB sources, I've found that
the problem is you can't display the XMM registers if the source language is
Fortran. But they do display OK if the source language is C or C++.
A workaround for the problem is "set source c++" while debugging Fortran.
The problem is that the $xmm# registers are defined as objects of
TYPE_CODE_UNION and the Fortran language does not support unions. (The
EQUIVALENCE statement notwithstanding.)
When a user enters a "p $xmm0" command, this object is passed to the f_val_print
() function in gdb/f-valprint.c. The switch therein does not have a case
statement for that type code so the default case is executed, which throws and
error.
I've created my own local fix by implementing a case TYPE_CODE_UNION clause in
f-valprint.c, which is good enough for my own purposes as a temporary hack.
I'm attaching the diff of the patch below for information only; I am NOT
suggesting that this is an acceptable long-term solution.
Presumably, other languages besides Fortran that don't support the union type
would have the same problem.
Presumably, the same problem will be encountered when AVX registers are
supported by GDB. (I assume someone at Intel is working on this.)
-----------------------------------
605,620c605
< break;
<
< case TYPE_CODE_UNION:
< /* This is not a valid Fortran data type, but if the user is
< * debugging a Fortran source and tries to display a SIMD register
< * e.g., "print $xmm0" then we wind up here.
< * HACK: pass this to c++ language object
< */
< {
< const struct language_defn * lang_cpp = language_def (language_cplus);
< if ((lang_cpp != NULL) && (lang_cpp != current_language))
< return lang_cpp->la_val_print (type, valaddr, embedded_offset,
< address, stream, format,
< deref_ref, recurse, pretty);
< // else FALL THRU.
< }
---
> break;
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* [Bug fortran/10154] GDB 6.6 won't display XMM registers: <error reading variable>
2009-05-14 23:32 [Bug mi/10154] New: " jim dot conyngham at amd dot com
@ 2009-05-18 17:32 ` jim dot conyngham at amd dot com
2009-05-18 18:08 ` jim dot conyngham at amd dot com
2009-05-19 16:02 ` jim dot conyngham at amd dot com
2 siblings, 0 replies; 4+ messages in thread
From: jim dot conyngham at amd dot com @ 2009-05-18 17:32 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From jim dot conyngham at amd dot com 2009-05-18 17:31 -------
Changing the "component" from MI (machine interface) to Fortran. (Sorry for
the inconvenience. I was mislead by the error message.)
--
What |Removed |Added
----------------------------------------------------------------------------
Component|mi |fortran
http://sourceware.org/bugzilla/show_bug.cgi?id=10154
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[not found] <bug-10154-4717@http.sourceware.org/bugzilla/>
2011-06-27 17:01 ` [Bug fortran/10154] GDB 6.6 won't display XMM registers: <error reading variable> tromey at redhat dot com
2009-05-14 23:32 [Bug mi/10154] New: " jim dot conyngham at amd dot com
2009-05-18 17:32 ` [Bug fortran/10154] " jim dot conyngham at amd dot com
2009-05-18 18:08 ` jim dot conyngham at amd dot com
2009-05-19 16:02 ` jim dot conyngham at amd dot com
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