Edebug

Edebug is a source-level debugger for Emacs Lisp programs with which you can:

• Step through evaluation, stopping before and after each expression.
• Set conditional or unconditional breakpoints.
• Stop when a specified condition is true (the global break event).
• Trace slow or fast, stopping briefly at each stop point, or at each breakpoint.
• Display expression results and evaluate expressions as if outside of Edebug.
• Automatically re-evaluate a list of expressions and display their results each time Edebug updates the display.
• Output trace info on function enter and exit.
• Stop when an error occurs.
• Display a backtrace, omitting Edebug's own frames.
• Specify argument evaluation for macros and defining forms.
• Obtain rudimentary coverage testing and frequency counts.

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

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