You can set a breakpoint in any form which might be evaluated, except for
The breakpoint can be at the start, function call or return point of the form.
For each of the load source, load fasl, compile defun and compile buffer operations, breakpoints are activated only after the operation has finished.
A locatable defining form is a named defining form that can be located by the Dspec system (for example by the
Find Dspec editor command). This includes
defmethod and all the standard Common Lisp definers. For more information about the Dspec system, see the
LispWorks User Guide and Reference Manual
When not at the current stepping position, a breakpoint is highlighted red in the Stepper source area. When the same source code is also visible in an Editor tool, the breakpoint is visible there too.
In the picture above, execution has stopped at the start of the print form and we have just set a breakpoint on the call to
+. Continuing from this point will cause execution to stop just before it calls
+, and the Stepper will display the arguments that are about to be passed to
To set a breakpoint from the Editor, see Breakpoints.
Suppose that you have reached a breakpoint on the call to
+ as set in the example above. To make this breakpoint conditional on a variable
*use-my-breakpoints* (which you should define with
Stepper > Edit Breakpoints...
Expression > Edit Breakpoints...
from the context menu:
The form defining the breakpoint condition is evaluated in the package where the stepped function was defined. Note that this package is displayed in the
tab of the Edit Breakpoint dialog. Therefore, after confirming the dialog shown above, your code breaks at the breakpoint depending on the value of
Again suppose that you have reached a breakpoint on the call to
+ as set in the example above. To make this breakpoint print, enter a valid Lisp expression in the
tab of the Edit Breakpoint dialog, and click OK.
Stepper value (+ 4 4 4 4): 16
To edit the Conditional or Printing properties of a breakpoint visible in the source, position the cursor on the breakpoint and proceed as described in Conditional breakpoints or Printing breakpoints.
Where you wish to change the Conditional or Printing properties of a breakpoint without finding it in the source, choose the menu command Stepper > Edit Breakpoints... . Select a breakpoint in the Breakpoints list and click the Edit... button. Choose the Conditional or Printing tab as appropriate and proceed as described in Conditional breakpoints and Printing breakpoints.
To visit the source code where a breakpoint was set, choose the menu command Stepper > Edit Breakpoints... . Select a breakpoint in the Breakpoints list and click the Goto Source button. This cancels the dialog and then displays the source containing the breakpoint.
Where you wish to remove one or more breakpoints without finding them in the source, choose the menu command Stepper > Edit Breakpoints... , select a breakpoint or breakpoints in the Breakpoints list, and click Remove .
LispWorks IDE User Guide (Macintosh version) - 13 Sep 2017