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(elisp)Trace Buffer

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Trace Buffer
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   Edebug can record an execution trace, storing it in a buffer named
`*edebug-trace*'.  This is a log of function calls and returns, showing
the function names and their arguments and values.  To enable trace
recording, set `edebug-trace' to a non-`nil' value.

   Making a trace buffer is not the same thing as using trace execution
mode (Note: Edebug Execution Modes).

   When trace recording is enabled, each function entry and exit adds
lines to the trace buffer.  A function entry record consists of
`::::{', followed by the function name and argument values.  A function
exit record consists of `::::}', followed by the function name and
result of the function.

   The number of `:'s in an entry shows its recursion depth.  You can
use the braces in the trace buffer to find the matching beginning or
end of function calls.

   You can customize trace recording for function entry and exit by
redefining the functions `edebug-print-trace-before' and
`edebug-print-trace-after'.

 - Macro: edebug-tracing string body...
     This macro requests additional trace information around the
     execution of the BODY forms.  The argument STRING specifies text
     to put in the trace buffer.  All the arguments are evaluated, and
     `edebug-tracing' returns the value of the last form in BODY.

 - Function: edebug-trace format-string &rest format-args
     This function inserts text in the trace buffer.  It computes the
     text with `(apply 'format FORMAT-STRING FORMAT-ARGS)'.  It also
     appends a newline to separate entries.

   `edebug-tracing' and `edebug-trace' insert lines in the trace buffer
whenever they are called, even if Edebug is not active.  Adding text to
the trace buffer also scrolls its window to show the last lines
inserted.