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08108a856a
* lisp/emacs-lisp/debug-early.el (debug-early-backtrace): Escape newlines to and bytecodes to make backtraces slightly more readable. Use `cl-prin1` when available.
92 lines
3.2 KiB
EmacsLisp
92 lines
3.2 KiB
EmacsLisp
;;; debug-early.el --- Dump a Lisp backtrace without frills -*- lexical-binding: t; -*-
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;; Copyright (C) 2022 Free Software Foundation, Inc.
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;; Author: Alan Mackenzie <acm@muc.de>
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: internal, backtrace, bootstrap.
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;; Package: emacs
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This file dumps a backtrace on stderr when an error is thrown. It
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;; has no dependencies on any Lisp libraries and is thus used for
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;; generating backtraces for bugs in the early parts of bootstrapping.
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;; It is also always used in batch model. It was introduced in Emacs
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;; 29, before which there was no backtrace available during early
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;; bootstrap.
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;;; Code:
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(defalias 'debug-early-backtrace
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#'(lambda ()
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"Print a trace of Lisp function calls currently active.
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The output stream used is the value of `standard-output'.
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This is a simplified version of the standard `backtrace'
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function, intended for use in debugging the early parts
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of the build process."
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(princ "\n")
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(let ((print-escape-newlines t)
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(print-escape-control-characters t)
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(print-escape-nonascii t)
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(prin1 (if (fboundp 'cl-prin1) #'cl-prin1 #'prin1)))
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(mapbacktrace
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#'(lambda (evald func args _flags)
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(let ((args args))
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(if evald
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(progn
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(princ " ")
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(funcall prin1 func)
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(princ "("))
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(progn
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(princ " (")
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(setq args (cons func args))))
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(if args
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(while (progn
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(funcall prin1 (car args))
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(setq args (cdr args)))
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(princ " ")))
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(princ ")\n")))))))
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(defalias 'debug-early
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#'(lambda (&rest args)
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"Print an error message with a backtrace of active Lisp function calls.
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The output stream used is the value of `standard-output'.
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The Emacs core calls this function after an error has been
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signaled, and supplies two ARGS. These are the symbol
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`error' (which is ignored) and a cons of the error symbol and the
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error data.
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`debug-early' is a simplified version of `debug', and is
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available during the early parts of the build process. It is
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superseded by `debug' after enough Lisp has been loaded to
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support the latter, except in batch mode which always uses
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`debug-early'.
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\(In versions of Emacs prior to Emacs 29, no backtrace was
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available before `debug' was usable.)"
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(princ "\nError: ")
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(prin1 (car (car (cdr args)))) ; The error symbol.
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(princ " ")
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(prin1 (cdr (car (cdr args)))) ; The error data.
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(debug-early-backtrace)))
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;;; debug-early.el ends here.
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