(lispref.info)Debugging


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Debugging Lisp Programs
***********************

   There are three ways to investigate a problem in an Emacs Lisp
program, depending on what you are doing with the program when the
problem appears.

   * If the problem occurs when you run the program, you can use the
     Lisp debugger to investigate what is happening during execution.

   * If the problem is syntactic, so that Lisp cannot even read the
     program, you can use the Emacs facilities for editing Lisp to
     localize it.

   * If the problem occurs when trying to compile the program with the
     byte compiler, you need to know how to examine the compiler's
     input buffer.

* Debugger
How the Emacs Lisp debugger is implemented.
* Syntax Errors
How to find syntax errors.
* Compilation Errors
How to find errors that show up in byte compilation.
* Edebug
A source-level Emacs Lisp debugger.
   Another useful debugging tool is a dribble file.  When a dribble file
is open, Emacs copies all keyboard input characters to that file.
Afterward, you can examine the file to find out what input was used.
Note: Terminal Input.
   For debugging problems in terminal descriptions, the
`open-termscript' function can be useful.  Note: Terminal Output.


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