Call-graph records have a format that is identical to the one used in
the BSD-derived file format. It consists of an arc in the call graph
and a count indicating the number of times the arc was traversed
during program execution. Arcs are specified by a pair of addresses:
the first must be within caller's function and the second must be
within the callee's function. When performing profiling at the
function level, these addresses can point anywhere within the
respective function. However, when profiling at the line-level, it is
better if the addresses are as close to the call-site/entry-point as
possible. This will ensure that the line-level call-graph is able to
identify exactly which line of source code performed calls to a
function.
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