This function adds to the existing call callback, rather than replace it, by putting a callback in front of it to be tested first. The callback will be invoked when the traversal sees a call to a specific function.
add_call_callback(callbacks, fn, cb)
The existing callbacks.
The function to which calls should be modified.
The callback function to invoke.
The callback that is installed will be called with the usual callback
arguments (which depend on context and user-provided information to
analysis_callbacks()), and additionally
the next callback in line, through the parameter
next_cb. This can be
used to propagate information through several callbacks in a pipe-like
The updated callbacks.
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