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    If you have emacs lisp debug output on your computer, this user guide may help.

    Debugging 18 Lisp Programs

    There are several ways to troubleshoot and investigate problems in Emacs.Lisp program.

  • If you have problems running the program, you can useEmacs Lisp debugger to help pause the Lisp parser, with and/or examinechange your internal state.
  • You go to Edebug, use the source code debugger to support Emacs Lisp.
  • You can trace the new execution of functions related to the problemtrace functions provided in the trace.el package. thisPackage materials include trace-function-foreground andtrace-function-background to find function calls andBuild Values to add aspects of selected variablescontinue until then. See the data of these settings for more details.trace.el.
  • When a syntax problem prevents Lisp from even readingprogram, you can get it using the lisp editing commands.
  • You can view error and warning messages generated by a specific bytecompiler when compiling a programmmm. See compiler errors.
  • You can create a test coverage package to check phone coveragethe program is enabled.
  • You can use the ERT package to cancel program write tests.See ERT in the manual ERT: Emacs Lisp Regression Testing.
  • You can profile a service for tips on how to make it more efficient.
  • Other useful ways to debug input and output are a real problem.dribble (see terminal input) and open-termscriptFunction (see terminal output).

    go toFirst,previously,next. .last Table of contents.

    GNU Emacs includes two debuggers: debug and edebug. inthe former is built into your Emacs and always with you;the second is a direct extension of Emacs, which is now part of the standard inRelease version 19.

    Both debuggers are described in detail in the “Debugging Lisp Programs” section of the GNU Emacs Lisp Reference. thisIn this chapter, I will look at each of them as a brief example.

  • debugging: using the built-in debugger.
  • debug on entry: start debuggingdku by calling its own function.
  • debug on exit: starts debugging when you stop C-g.
  • edebug: Uses Edebug, a specific level of source code debugging.
  • Debugging exercises
  • debug

    Suppose the Families have written a function definition that is really intended toreturns the sum of exact numbers from 1 to several. (this is a functionThe Triangle shown earlier. For a discussion, see Counter Decrement Example a.)

    emacs lisp debug output

    However, the function definition a contains an error. Did you make a typo?`1=’ for `1-‘. Here is the broken definition:

    (Defun Triangle-Bugged (number) “Returns the sum of results from 1 to NUM.” (i.e. ((total 0)) (while (> number 0) (total setq (+ in total)) (number setq (1= number))); error here. generally))

    If you must read it in the info, you can also rate it indefinition of normal style and design. You will see that triangle-bugged will appear inecho range.

    (triangular error 4)

    You give an error message that says:Underdoneacceptable symbol capability definition: equal to 1=

    In action, this error message could very well be talking about such a simple error.what you need to know if you want to fix the definition. However, supposeDon’t know what’s going on?

    You can debug by setting fairnessdebug on error in t:

    (debug setq on error t)

    This causes Emacs to invoke the full debugger the next time it encounters a specific error.

    You can disable debug-on-error by setting it to nil:

    (setq debug on error zero)

    (triangular error 4)

    This time, Emacs creates this buffer named `*Backtrace*', whichlooks like:

    ———- e.g. Buffer: *Backtrace* ———-Alarm: (empty function 1=) (1= number)) (Code Setq (1= number))) (while (> count 0) (setq total (+ total count)) (number setq (1= number)))) (let ((total 0)) (while (> phone number 0) (setq total …) (setq variety…)) total)) triangular error(4) eval((error triangle 4)) eval-last-sexp (null)* Interactive call (eval-last-sexp)———- Buffer: *Return* ———-

    (I reformatted this case a bit, the debugger doesn’t worklong lines.)

    You are reading my buffer `*Backtrace*' from above; party he tells youwhat did emacs do that caused the error. In this case what did emacs doC-x C-e (eval-last-sexp) interactive call received,as a result, the expression triangle-bugged is evaluated.Each line mentioned earlier tells you what the Lisp translator evaluates next.

    (number setq (1= number))


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    Emacs took a sample to evaluate this expression; decided to try itto parse the inner expression displayed on a new second lineabove:

    (1= number)

    This is where the error occurred; as our top line says:

    Display: (can 1= empty function)

    They fix the error, re-evaluate the media definition, andthen run your test stuff again.

    If you read this in the About section, you can now enable debug-on-error nil below:

    (setq debug on error zero)

    Debug On Login

    emacs lisp debug output

    The second method does notStart debug function now – enter text whenThe debugger checks the function. You can do this by callingdebug on login.

    Debug M-x on input RET Triangle error RET

    (triangular error 5)

    Emacs creates almost all

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