4.2 Tracing options

4.2.8 Storing the memory allocation made during a function call

:allocation

Trace keyword

:allocation form

: If form is non-nil, this prints the memory allocation, in bytes, made during a function call. The symbol that form evaluates to is used to accumulate the amount of memory allocated between entering and exiting the traced function.
: Note that this symbol continues to be used as an accumulator on subsequent calls to the traced function; the value is compounded, rather than over-written.

Consider the example below:

: 1. For thefac function, set the value of:allocation to$$fac-alloc.
: 2. In the listener, callfac, and then examine the value of$$fac-alloc.

CL-USER 152 > $$fac-alloc
744