SXEmacs Lisp Reference Manual: Edebug

Edebug is a source-level debugger for SXEmacs and XEmacs Lisp programs that provides the following features:

Step through evaluation, stopping before and after each expression.
Set conditional or unconditional breakpoints, install embedded breakpoints, or a global break event.
Trace slow or fast stopping briefly at each stop point, or each breakpoint.
Display expression results and evaluate expressions as if outside of Edebug. Interface with the custom printing package for printing circular structures.
Automatically reevaluate a list of expressions and display their results each time Edebug updates the display.
Output trace info on function enter and exit.
Errors stop before the source causing the error.
Display backtrace without Edebug calls.
Allow specification of argument evaluation for macros and defining forms.
Provide rudimentary coverage testing and display of frequency counts.

The first three sections should tell you enough about Edebug to enable you to use it.

• Using Edebug:		Introduction to use of Edebug.
• Instrumenting:		You must first instrument code.
• Edebug Execution Modes:		Execution modes, stopping more or less often.
• Jumping:		Commands to jump to a specified place.
• Edebug Misc:		Miscellaneous commands.
• Breakpoints:		Setting breakpoints to make the program stop.
• Trapping Errors:		trapping errors with Edebug.
• Edebug Views:		Views inside and outside of Edebug.
• Edebug Eval:		Evaluating expressions within Edebug.
• Eval List:		Automatic expression evaluation.
• Reading in Edebug:		Customization of reading.
• Printing in Edebug:		Customization of printing.
• Tracing:		How to produce tracing output.
• Coverage Testing:		How to test evaluation coverage.
• The Outside Context:		Data that Edebug saves and restores.
• Instrumenting Macro Calls:		Specifying how to handle macro calls.
• Edebug Options:		Option variables for customizing Edebug.