Profiling an installed R package with source line numbers?

I would like to profile functions in an installed R package ( data.table

) using Rprof()

c line.profiling=TRUE

. Typically an installed package is byte-compiled, and line numbers are not available for byte-compiled packages. The usual instructions for profiling strings with Rprof()

require the use of source()

or eval(parse())

that the attributes be present srcref

.

How can I load data.table so that the row numbers are active? My naive attempts to download the package with first library(data.table)

and then source('data.table.R')

fail because some of the compiled C functions are not found when I try to use the package, apparently because it library()

uses a different namespace. Maybe there is some way source()

to enter the correct namespace?

Alternatively, perhaps I can create a modified version data.table

that has not been byte-compiled and then load it in a way that preserves the line numbers? What changes would I have to make, and how would I load it? I started by installing ByteCompile: FALSE

and then tried it R CMD INSTALL -l ~/R/lib --build data.table

, but it still looks like bytes being compiled.

I really want to do this job and will pursue any suggestions. I am running R 3.2.1 on Linux, have full control over the machine, and can install whatever is required.

Edit:

A more complete description of the problem I was trying to solve (and a solution for it) is given here: https://github.com/Rdatatable/data.table/issues/1249

I ended up doing what Joshua suggested: recompile the package with "KeepSource: TRUE" in the DESCRIPTION. For my purposes, I also found "ByteCompile: FALSE" useful, although this may not apply in general. I also changed the version number to see that I am using my modified version.

Then I installed to a different location with "R CMD INSTALL data.table -l ~ / R / lib" and loaded with "library (data.table, lib = '~ / R / lib)". When used with the patches referenced in the link, I got the line numbers from the appropriations as needed. But if anyone knows a solution that doesn't require recompilation, I'm sure others will appreciate if you share.