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name: lisp/emacs-lisp/debug-early.el 	 # note: path name is non-authoritative(*)

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;;; debug-early.el --- Dump a Lisp backtrace without frills  -*- lexical-binding: t; -*-

;; Copyright (C) 2022 Free Software Foundation, Inc.

;; Author: Alan Mackenzie <acm@muc.de>
;; Maintainer: emacs-devel@gnu.org
;; Keywords: internal, backtrace, bootstrap.
;; Package: emacs

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; This file dumps a backtrace on stderr when an error is thrown.
;; It has no dependencies on any Lisp libraries and is thus suitable
;; for generating backtraces in the early parts of bootstrapping.  It
;; is also good for generating backtraces in batch mode in general.

(defalias 'debug-early-backtrace
  #'(lambda ()
  "Print a trace of Lisp function calls currently active.
The output stream used is the value of `standard-output'.

This is a simplified version of the standard `backtrace'
function, intended for use in debugging the early parts
of the build process."
  (princ "\n")
  (mapbacktrace
   #'(lambda (evald func args _flags)
       (let ((args args))
	 (if evald
	     (progn
	       (princ "  ")
	       (prin1 func)
	       (princ "(")
	       (while args
		 (prin1 (car args))
		 (setq args (cdr args))
		 (if args
		     (princ " ")))
	       (princ ")\n"))
	   (while args
	     (princ "  ")
	     (prin1 (car args))
	     (princ "\n")
	     (setq args (cdr args)))))))))

(defalias 'debug-early
  #'(lambda (&rest args)
  "Print an error message with a backtrace of active Lisp function calls.
The output stream used is the value of `standard-output'.

There should be two ARGS: the symbol `error' (which is ignored)
and a cons of the error symbol and the error data.

This is a simplified version of `debug', intended to produce
diagnostics to help in debugging the early parts of the build
process.  It is typically called by the Emacs core when an error
is signaled.

`debug-early' is the default value of the symbol `debugger'
before enough Lisp has been loaded to support `debug' itself, and
in batch mode."
  (princ "\nError: ")
  (prin1 (car (car (cdr args))))	; The error symbol.
  (princ " ")
  (prin1 (cdr (car (cdr args))))	; The error data.
  (debug-early-backtrace)))

;;; debug-early.el ends here.

debug log:

solving aeb8e8f1b2 ...
found aeb8e8f1b2 in https://yhetil.org/emacs/YfxKnp8dAgfCMSVV@ACM/
found 718000bfa4 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 718000bfa4c77070c6f284dcd909463dd6de1bf1	lisp/emacs-lisp/debug-early.el

applying [1/1] https://yhetil.org/emacs/YfxKnp8dAgfCMSVV@ACM/
diff --git a/lisp/emacs-lisp/debug-early.el b/lisp/emacs-lisp/debug-early.el
index 718000bfa4..aeb8e8f1b2 100644

Checking patch lisp/emacs-lisp/debug-early.el...
Applied patch lisp/emacs-lisp/debug-early.el cleanly.

index at:
100644 aeb8e8f1b2a4bf3a431100488d0a220561d8c93c	lisp/emacs-lisp/debug-early.el

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