MI to access value of $ prefixed variable name
Simon Marchi
simon.marchi@polymtl.ca
Tue May 25 14:03:56 GMT 2021
On 2021-05-25 12:35 a.m., Jonah Graham wrote:
> Hello,
>
> I have a user of Eclipse CDT who is having problems displaying a C variable
> called $j (dollar sign prefixed variable) -
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=573703
>
> I understand this is because $ prefixed variables are treated specially by
> GDB.
>
> 47-stack-list-locals --thread 1 --frame 0 1
> 47^done,locals=[{name="$f",value="0"}]
>
> 52-var-create --thread 1 --frame 0 - * $f
> 52^done,name="var3",numchild="0",value="void",type="void",has_more="0"
>
> Note type "void" above, $f is an int in the C code, but is indeed void (as
> expected) in GDB. -stack-list-locals shows the correct value, but I can't
> use the returned name back to -var-create because of the naming conflict.
>
> There wasn't anything I saw in the help (
> https://sourceware.org/gdb/onlinedocs/gdb/GDB_002fMI-Variable-Objects.html)
> on this topic.
Huh, I didn't know this was possible:
https://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar-Signs
I didn't look in depth, but I don't think there's a way to make it work.
I don't remember seeing a way to escape that dollar sign.
I'd say that the simplest solution would be: don't use dollar sign in
identifiers. But if somebody really wants GDB to support it, then they
can always send a patch for it (I don't think this is a priority for
anyone).
Simon
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