The 'Writing R Extensions' manual, configure.ac, and the comment at
the top of memory.c suggests that there are valgrind instrumentation
levels 0, 1, 2 but I think the actual code has four levels.
level 0 is no additional instrumentation
level 1 marks uninitialized numeric, logical, integer vectors
and R_alloc memory
level 2 marks free memory (DATAPTR, STRING_PTR) and the protection
stack as inaccessible
level 3 marks SEXP as inaccessible
--
Martin Morgan
Bioconductor / Computational Biology
http://bioconductor.org
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