[Rd] Viewing R objects in gdb
murdoch at stats.uwo.ca
Wed Jun 29 19:49:54 CEST 2005
I'm trying to track down a bug in some experimental code, where an
object's attribute is getting messed up. This means I'd like to examine
R objects while within gdb.
One of the things I'd like to do is to examine the names of all the
attributes. This is exactly what an example in the R Extensions manual
section 4.11.2 "Inspecting R objects when debugging" does, but the code
there doesn't work, presumably because the R internals have changed
since it was written.
Specifically, I get
(gdb) p $a->u.listsxp.tagval->u.symsxp.pname->u.vecsxp.type.c
Error: There is no member named vecsxp.
where $a was set to be the attrib member of an SEXP.
Could someone let me know what needs to be fixed for this to work? I
imagine it's a typecast, but I haven't been able to put it together.
(An example using R_PV to print the attributes of an SEXP would also be
welcome, but I can probably figure that one out once I get this...)
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