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11.19 Debugging with :no-symbol-function-usage

When no-symbol-function-usage is true while delivering an image "foo" on x86 platforms, delivery writes a file named "foo.zaps" (the "zaps file") containing debug information about the symbols that were eliminated.

If an error occurs in the delivered image, the backtrace will contain a line of the form.

("SYMBOL-FUNCTION-VECTOR" nnn)

where nnn is an integer. The actual function name can be recovered from the zaps file by doing this in the LispWorks development image:

(require "delivery")
(dv::recover-zapped-symbol-from-file "foo.zaps"
 nnn
)

The numbers are unique to each image, so take care to use the zaps file that was produced at the same time as the delivered image.


LispWorks Delivery User Guide - 15 Feb 2015

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