Objects of type
code-coverage-file-stats are created by code-coverage-data-generate-statistics, and are then accessed by the readers.
code-coverage-file-stats-source-file returns the truename of the source file. The pseudo-readers return integers counting "lambdas" in this file, where "lambda" here means a separate function object that was produced by the compiler. In most cases these correspond to pieces of code that you can see, like a function that results from
cl:defmethod, or a lambda that appears in your code, but in some cases the compiler generates functions in a non-obvious way.
Functions that are defined by
Macros and macro-like (for example
Load time lambdas that the compiler generates.
Other lambdas (including
LispWorks User Guide and Reference Manual - 20 Sep 2017