[PATCH] Print trace state variables

[Stan Shebs <stan at codesourcery dot com>]

This patch remedies an oversight in recent tracepoint work, by adding 
printing of trace state variables.  While you can see tsv values using 
"info tvariables", it's much more useful to be able to include them in 
print commands and expressions in general; you can then display them in 
different formats, or compute the difference between a tsv and some 
other value.  The manual already documents this as working, only the 
code to do it has been missing. :-)

This has been in CodeSourcery's version for some time, but I set it 
aside for awhile because it seemed a little kludgy to add a 
tracepoint-specific case into general evaluation.  On the plus side, its 
effect is localized, and should be safe for a 7.2 update release, where 
it will be useful for work on trace support in Eclipse.  There are no 
regressions testing with either i386-linux native or GDBserver.

If this seems reasonable, I'll put in both trunk and 7.2 branch.

Stan

2010-12-08  Stan Shebs <stan@codesourcery.com>

    * value.c (value_of_internalvar): Add case for trace state
    variables.

    * gdb.trace/tsv.exp: Test print command on trace state variables.

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