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(elisp)Debugger

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The Lisp Debugger
=================

   The ordinary "Lisp debugger" provides the ability to suspend
evaluation of a form.  While evaluation is suspended (a state that is
commonly known as a "break"), you may examine the run time stack,
examine the values of local or global variables, or change those values.
Since a break is a recursive edit, all the usual editing facilities of
Emacs are available; you can even run programs that will enter the
debugger recursively.  Note: Recursive Editing.

Error Debugging

Entering the debugger when an error happens.

Infinite Loops

Stopping and debugging a program that doesn't exit.

Function Debugging

Entering it when a certain function is called.

Explicit Debug

Entering it at a certain point in the program.

Using Debugger

What the debugger does; what you see while in it.

Debugger Commands

Commands used while in the debugger.

Invoking the Debugger

How to call the function `debug'.

Internals of Debugger

Subroutines of the debugger, and global variables.