[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
master 9029212c86: * lisp/emacs-lisp/debug-early.el: Improve the documen
From: |
Alan Mackenzie |
Subject: |
master 9029212c86: * lisp/emacs-lisp/debug-early.el: Improve the documentation |
Date: |
Sat, 5 Feb 2022 05:44:48 -0500 (EST) |
branch: master
commit 9029212c869aa532e14d5e2048df070902d4ca8f
Author: Alan Mackenzie <acm@muc.de>
Commit: Alan Mackenzie <acm@muc.de>
* lisp/emacs-lisp/debug-early.el: Improve the documentation
---
lisp/emacs-lisp/debug-early.el | 28 +++++++++++++++++++---------
1 file changed, 19 insertions(+), 9 deletions(-)
diff --git a/lisp/emacs-lisp/debug-early.el b/lisp/emacs-lisp/debug-early.el
index 718000bfa4..e557643e46 100644
--- a/lisp/emacs-lisp/debug-early.el
+++ b/lisp/emacs-lisp/debug-early.el
@@ -24,10 +24,12 @@
;;; 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.
+;; This file dumps a backtrace on stderr when an error is thrown. It
+;; has no dependencies on any Lisp libraries and is thus used for
+;; generating backtraces for bugs in the early parts of bootstrapping.
+;; It is also always used in batch model. It was introduced in Emacs
+;; 29, before which there was no backtrace available during early
+;; bootstrap.
(defalias 'debug-early-backtrace
#'(lambda ()
@@ -60,14 +62,22 @@ of the build process."
(defalias 'debug-early
#'(lambda (&rest args)
- "Print a trace of Lisp function calls currently active.
+ "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' and a cons of
-the error symbol and its data.
+The Emacs core calls this function after an error has been
+signaled, and supplies two ARGS. These are the symbol
+`error' (which is ignored) and a cons of the error symbol and the
+error data.
+
+`debug-early' is a simplified version of `debug', and is
+available during the early parts of the build process. It is
+superseded by `debug' after enough Lisp has been loaded to
+support the latter, except in batch mode which always uses
+`debug-early'.
-This is a simplified version of `debug', intended for use
-in debugging the early parts of the build process."
+(In versions of Emacs prior to Emacs 29, no backtrace was
+available before `debug' was usable.)"
(princ "\nError: ")
(prin1 (car (car (cdr args)))) ; The error symbol.
(princ " ")
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- master 9029212c86: * lisp/emacs-lisp/debug-early.el: Improve the documentation,
Alan Mackenzie <=