[Rd] PROTECT help
therneau at mayo.edu
Tue Mar 27 15:22:38 CEST 2012
I received the following note this AM. The problem is, I'm not quite
sure how to fix it.
Can one use PROTECT(coxlist(eval(PROTECT.... , do I create an
intermediate variable, or otherwise?
I'm willing to update the code if someone will give me a pointer to the
right documentation. This particular chunk was written when there was a
lot of change going on in the callback mechanism and so there might be a
safer and/or simpler and/or more standard aproach by now. The routine in
question has to do with penalized Cox models, the C code needs to get
the value of the penalty and the penalty is an arbitrary S expression
passed down from top level.
In survival_2.36-12 (and earlier), in the function cox_callback() at
the return value of the call to lang2() is vulnerable if allocations
within eval() give rise to garbage collection.
(Discovered during CXXR development.)
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