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Code-locations represent places in functions where the system has correct information about the function’s environment and where interesting operations can occur—asking for a local variable’s value, setting breakpoints, evaluating forms within the function’s environment, etc.
Sometimes the interface returns unknown code-locations. These
represent places in functions, but there is no debug information
associated with them. Some operations accept these since they may
succeed even with missing debug data. These operations’ argument is
named basic-code-location indicating they take known and unknown
code-locations. If an operation names its argument
code-location, and you supply an unknown one, it will signal an
error. For example, frame-code-location
may return an unknown
code-location if someone interrupted Lisp in the given frame. The
system knows where execution will continue, but this place in the code
may not be a place for which the compiler dumped debug information.
This function returns the debug-function representing information about the function corresponding to the code-location.
This function returns the debug-block containing code-location if it
is available. Some debug policies inhibit debug-block information,
and if none is available, then this signals a no-debug-blocks
condition.
This function returns the number of top-level forms before the one containing code-location as seen by the compiler in some compilation unit. A compilation unit is not necessarily a single file, see the section on debug-sources.
This function returns the number of the form corresponding to
code-location. The form number is derived by walking the
subforms of a top-level form in depth-first order. While walking
the top-level form, count one in depth-first order for each subform
that is a cons. See form-number-translations
.
This function returns code-location’s debug-source.
This function returns whether basic-code-location is unknown.
It returns nil
when the code-location is known.
This function returns whether the two code-locations are the same.
Next: Debug-sources, Previous: Breakpoints, Up: Debugger Programmer’s Interface [Contents][Index]