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624 lines
23 KiB
EmacsLisp
624 lines
23 KiB
EmacsLisp
;;; debug.el --- debuggers and related commands for Emacs
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;; Copyright (C) 1985, 1986, 1994 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: lisp, tools, maint
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This is a major mode documented in the Emacs manual.
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;;; Code:
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(defgroup debugger nil
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"Debuggers and related commands for Emacs."
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:prefix "debugger-"
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:group 'debug)
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(defcustom debugger-mode-hook nil
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"*Hooks run when `debugger-mode' is turned on."
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:type 'hook
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:group 'debugger
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:version "20.3")
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(defcustom debugger-batch-max-lines 40
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"*Maximum lines to show in debugger buffer in a noninteractive Emacs.
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When the debugger is entered and Emacs is running in batch mode,
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if the backtrace text has more than this many lines,
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the middle is discarded, and just the beginning and end are displayed."
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:type 'integer
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:group 'debugger
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:version "21.1")
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(defcustom debug-function-list nil
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"List of functions currently set for debug on entry."
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:type '(repeat function)
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:group 'debugger)
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(defcustom debugger-step-after-exit nil
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"Non-nil means \"single-step\" after the debugger exits."
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:type 'boolean
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:group 'debugger)
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(defvar debugger-value nil
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"This is the value for the debugger to return, when it returns.")
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(defvar debugger-old-buffer nil
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"This is the buffer that was current when the debugger was entered.")
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(defvar debugger-outer-match-data)
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(defvar debugger-outer-load-read-function)
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(defvar debugger-outer-overriding-local-map)
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(defvar debugger-outer-overriding-terminal-local-map)
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(defvar debugger-outer-track-mouse)
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(defvar debugger-outer-last-command)
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(defvar debugger-outer-this-command)
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(defvar debugger-outer-unread-command-char)
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(defvar debugger-outer-unread-command-events)
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(defvar debugger-outer-unread-post-input-method-events)
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(defvar debugger-outer-last-input-event)
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(defvar debugger-outer-last-command-event)
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(defvar debugger-outer-last-nonmenu-event)
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(defvar debugger-outer-last-event-frame)
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(defvar debugger-outer-standard-input)
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(defvar debugger-outer-standard-output)
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(defvar debugger-outer-inhibit-redisplay)
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(defvar debugger-outer-cursor-in-echo-area)
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;;;###autoload
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(setq debugger 'debug)
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;;;###autoload
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(defun debug (&rest debugger-args)
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"Enter debugger. To return, type \\<debugger-mode-map>`\\[debugger-continue]'.
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Arguments are mainly for use when this is called from the internals
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of the evaluator.
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You may call with no args, or you may pass nil as the first arg and
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any other args you like. In that case, the list of args after the
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first will be printed into the backtrace buffer."
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(interactive)
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(unless noninteractive
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(message "Entering debugger..."))
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(let (debugger-value
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(debug-on-error nil)
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(debug-on-quit nil)
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(debugger-buffer (let ((default-major-mode 'fundamental-mode))
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(get-buffer-create "*Backtrace*")))
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(debugger-old-buffer (current-buffer))
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(debugger-step-after-exit nil)
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;; Don't keep reading from an executing kbd macro!
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(executing-kbd-macro nil)
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;; Save the outer values of these vars for the `e' command
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;; before we replace the values.
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(debugger-outer-match-data (match-data))
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(debugger-outer-load-read-function load-read-function)
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(debugger-outer-overriding-local-map overriding-local-map)
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(debugger-outer-overriding-terminal-local-map
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overriding-terminal-local-map)
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(debugger-outer-track-mouse track-mouse)
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(debugger-outer-last-command last-command)
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(debugger-outer-this-command this-command)
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(debugger-outer-unread-command-char unread-command-char)
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(debugger-outer-unread-command-events unread-command-events)
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(debugger-outer-unread-post-input-method-events
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unread-post-input-method-events)
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(debugger-outer-last-input-event last-input-event)
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(debugger-outer-last-command-event last-command-event)
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(debugger-outer-last-nonmenu-event last-nonmenu-event)
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(debugger-outer-last-event-frame last-event-frame)
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(debugger-outer-standard-input standard-input)
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(debugger-outer-standard-output standard-output)
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(debugger-outer-inhibit-redisplay inhibit-redisplay)
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(debugger-outer-cursor-in-echo-area cursor-in-echo-area))
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;; Set this instead of binding it, so that `q'
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;; will not restore it.
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(setq overriding-terminal-local-map nil)
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;; Don't let these magic variables affect the debugger itself.
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(let ((last-command nil) this-command track-mouse
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(unread-command-char -1) unread-command-events
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unread-post-input-method-events
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last-input-event last-command-event last-nonmenu-event
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last-event-frame
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overriding-local-map
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load-read-function
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;; If we are inside a minibuffer, allow nesting
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;; so that we don't get an error from the `e' command.
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(enable-recursive-minibuffers
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(or enable-recursive-minibuffers (> (minibuffer-depth) 0)))
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(standard-input t) (standard-output t)
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inhibit-redisplay
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(cursor-in-echo-area nil))
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(unwind-protect
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(save-excursion
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(save-window-excursion
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(pop-to-buffer debugger-buffer)
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(debugger-mode)
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(debugger-setup-buffer debugger-args)
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(when noninteractive
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;; If the backtrace is long, save the beginning
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;; and the end, but discard the middle.
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(when (> (count-lines (point-min) (point-max))
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debugger-batch-max-lines)
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(goto-char (point-min))
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(forward-line (/ 2 debugger-batch-max-lines))
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(let ((middlestart (point)))
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(goto-char (point-max))
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(forward-line (- (/ 2 debugger-batch-max-lines)
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debugger-batch-max-lines))
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(delete-region middlestart (point)))
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(insert "...\n"))
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(goto-char (point-min))
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(message (buffer-string))
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(kill-emacs))
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(if (eq (car debugger-args) 'debug)
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;; Skip the frames for backtrace-debug, byte-code, and debug.
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(backtrace-debug 3 t))
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(debugger-reenable)
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(message "")
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(let ((inhibit-trace t)
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(standard-output nil)
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(buffer-read-only t))
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(message "")
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;; Make sure we unbind buffer-read-only in the right buffer.
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(save-excursion
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(recursive-edit)))))
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;; Kill or at least neuter the backtrace buffer, so that users
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;; don't try to execute debugger commands in an invalid context.
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(if (get-buffer-window debugger-buffer 'visible)
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;; Still visible despite the save-window-excursion? Maybe it
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;; it's in a pop-up frame. It would be annoying to delete and
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;; recreate it every time the debugger stops, so instead we'll
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;; erase it but leave it visible.
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(save-excursion
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(set-buffer debugger-buffer)
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(erase-buffer)
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(fundamental-mode))
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(kill-buffer debugger-buffer))
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(set-match-data debugger-outer-match-data)))
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;; Put into effect the modified values of these variables
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;; in case the user set them with the `e' command.
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(setq load-read-function debugger-outer-load-read-function)
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(setq overriding-local-map debugger-outer-overriding-local-map)
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(setq overriding-terminal-local-map
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debugger-outer-overriding-terminal-local-map)
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(setq track-mouse debugger-outer-track-mouse)
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(setq last-command debugger-outer-last-command)
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(setq this-command debugger-outer-this-command)
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(setq unread-command-char debugger-outer-unread-command-char)
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(setq unread-command-events debugger-outer-unread-command-events)
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(setq unread-post-input-method-events
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debugger-outer-unread-post-input-method-events)
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(setq last-input-event debugger-outer-last-input-event)
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(setq last-command-event debugger-outer-last-command-event)
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(setq last-nonmenu-event debugger-outer-last-nonmenu-event)
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(setq last-event-frame debugger-outer-last-event-frame)
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(setq standard-input debugger-outer-standard-input)
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(setq standard-output debugger-outer-standard-output)
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(setq inhibit-redisplay debugger-outer-inhibit-redisplay)
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(setq cursor-in-echo-area debugger-outer-cursor-in-echo-area)
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(setq debug-on-next-call debugger-step-after-exit)
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debugger-value))
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(defun debugger-setup-buffer (debugger-args)
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"Initialize the `*Backtrace*' buffer for entry to the debugger.
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That buffer should be current already."
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(setq buffer-read-only nil)
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(erase-buffer)
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(set-buffer-multibyte nil)
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(let ((standard-output (current-buffer))
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(print-escape-newlines t)
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(print-level 8)
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(print-length 50))
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(backtrace))
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(goto-char (point-min))
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(delete-region (point)
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(progn
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(search-forward "\n debug(")
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(forward-line 1)
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(point)))
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(insert "Debugger entered")
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;; lambda is for debug-on-call when a function call is next.
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;; debug is for debug-on-entry function called.
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(cond ((memq (car debugger-args) '(lambda debug))
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(insert "--entering a function:\n")
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(if (eq (car debugger-args) 'debug)
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(progn
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(delete-char 1)
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(insert ?*)
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(beginning-of-line))))
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;; Exiting a function.
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((eq (car debugger-args) 'exit)
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(insert "--returning value: ")
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(setq debugger-value (nth 1 debugger-args))
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(prin1 debugger-value (current-buffer))
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(insert ?\n)
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(delete-char 1)
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(insert ? )
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(beginning-of-line))
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;; Debugger entered for an error.
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((eq (car debugger-args) 'error)
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(insert "--Lisp error: ")
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(prin1 (nth 1 debugger-args) (current-buffer))
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(insert ?\n))
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;; debug-on-call, when the next thing is an eval.
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((eq (car debugger-args) t)
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(insert "--beginning evaluation of function call form:\n"))
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;; User calls debug directly.
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(t
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(insert ": ")
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(prin1 (if (eq (car debugger-args) 'nil)
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(cdr debugger-args) debugger-args)
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(current-buffer))
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(insert ?\n))))
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(defun debugger-step-through ()
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"Proceed, stepping through subexpressions of this expression.
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Enter another debugger on next entry to eval, apply or funcall."
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(interactive)
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(setq debugger-step-after-exit t)
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(message "Proceeding, will debug on next eval or call.")
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(exit-recursive-edit))
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(defun debugger-continue ()
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"Continue, evaluating this expression without stopping."
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(interactive)
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(unless debugger-may-continue
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(error "Cannot continue"))
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(message "Continuing.")
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(exit-recursive-edit))
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(defun debugger-return-value (val)
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"Continue, specifying value to return.
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This is only useful when the value returned from the debugger
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will be used, such as in a debug on exit from a frame."
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(interactive "XReturn value (evaluated): ")
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(setq debugger-value val)
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(princ "Returning " t)
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(prin1 debugger-value)
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(exit-recursive-edit))
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;; Chosen empirically to account for all the frames
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;; that will exist when debugger-frame is called
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;; within the first one that appears in the backtrace buffer.
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;; Assumes debugger-frame is called from a key;
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;; will be wrong if it is called with Meta-x.
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(defconst debugger-frame-offset 8 "")
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(defun debugger-jump ()
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"Continue to exit from this frame, with all debug-on-entry suspended."
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(interactive)
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;; Compensate for the two extra stack frames for debugger-jump.
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(let ((debugger-frame-offset (+ debugger-frame-offset 2)))
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(debugger-frame))
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;; Turn off all debug-on-entry functions
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;; but leave them in the list.
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(let ((list debug-function-list))
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(while list
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(fset (car list)
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(debug-on-entry-1 (car list) (symbol-function (car list)) nil))
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(setq list (cdr list))))
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(message "Continuing through this frame")
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(exit-recursive-edit))
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(defun debugger-reenable ()
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"Turn all debug-on-entry functions back on."
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(let ((list debug-function-list))
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(while list
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(or (consp (symbol-function (car list)))
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(debug-convert-byte-code (car list)))
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(fset (car list)
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(debug-on-entry-1 (car list) (symbol-function (car list)) t))
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(setq list (cdr list)))))
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(defun debugger-frame-number ()
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"Return number of frames in backtrace before the one point points at."
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(save-excursion
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(beginning-of-line)
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(let ((opoint (point))
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(count 0))
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(goto-char (point-min))
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(if (or (equal (buffer-substring (point) (+ (point) 6))
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"Signal")
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(equal (buffer-substring (point) (+ (point) 6))
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"Return"))
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(progn
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(search-forward ":")
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(forward-sexp 1)))
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(forward-line 1)
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(while (progn
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(forward-char 2)
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(if (= (following-char) ?\()
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(forward-sexp 1)
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(forward-sexp 2))
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(forward-line 1)
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(<= (point) opoint))
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(setq count (1+ count)))
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count)))
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(defun debugger-frame ()
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"Request entry to debugger when this frame exits.
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Applies to the frame whose line point is on in the backtrace."
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(interactive)
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(beginning-of-line)
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(let ((level (debugger-frame-number)))
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(backtrace-debug (+ level debugger-frame-offset) t))
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(if (= (following-char) ? )
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(let ((buffer-read-only nil))
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(delete-char 1)
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(insert ?*)))
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(beginning-of-line))
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(defun debugger-frame-clear ()
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"Do not enter debugger when this frame exits.
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Applies to the frame whose line point is on in the backtrace."
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(interactive)
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(beginning-of-line)
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(let ((level (debugger-frame-number)))
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(backtrace-debug (+ level debugger-frame-offset) nil))
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(if (= (following-char) ?*)
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(let ((buffer-read-only nil))
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(delete-char 1)
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(insert ? )))
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(beginning-of-line))
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(put 'debugger-env-macro 'lisp-indent-function 0)
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(defmacro debugger-env-macro (&rest body)
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"Run BODY in original environment."
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`(save-excursion
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(if (null (buffer-name debugger-old-buffer))
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;; old buffer deleted
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(setq debugger-old-buffer (current-buffer)))
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(set-buffer debugger-old-buffer)
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(let ((load-read-function debugger-outer-load-read-function)
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(overriding-terminal-local-map
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debugger-outer-overriding-terminal-local-map)
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(overriding-local-map debugger-outer-overriding-local-map)
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(track-mouse debugger-outer-track-mouse)
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(last-command debugger-outer-last-command)
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(this-command debugger-outer-this-command)
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(unread-command-char debugger-outer-unread-command-char)
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(unread-command-events debugger-outer-unread-command-events)
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(unread-post-input-method-events
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debugger-outer-unread-post-input-method-events)
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(last-input-event debugger-outer-last-input-event)
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(last-command-event debugger-outer-last-command-event)
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(last-nonmenu-event debugger-outer-last-nonmenu-event)
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(last-event-frame debugger-outer-last-event-frame)
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(standard-input debugger-outer-standard-input)
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(standard-output debugger-outer-standard-output)
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(inhibit-redisplay debugger-outer-inhibit-redisplay)
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(cursor-in-echo-area debugger-outer-cursor-in-echo-area))
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(set-match-data debugger-outer-match-data)
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(prog1 (progn ,@body)
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(setq debugger-outer-match-data (match-data))
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(setq debugger-outer-load-read-function load-read-function)
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(setq debugger-outer-overriding-terminal-local-map
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overriding-terminal-local-map)
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(setq debugger-outer-overriding-local-map overriding-local-map)
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(setq debugger-outer-track-mouse track-mouse)
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(setq debugger-outer-last-command last-command)
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(setq debugger-outer-this-command this-command)
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(setq debugger-outer-unread-command-char unread-command-char)
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(setq debugger-outer-unread-command-events unread-command-events)
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(setq debugger-outer-unread-post-input-method-events
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unread-post-input-method-events)
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(setq debugger-outer-last-input-event last-input-event)
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(setq debugger-outer-last-command-event last-command-event)
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(setq debugger-outer-last-nonmenu-event last-nonmenu-event)
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(setq debugger-outer-last-event-frame last-event-frame)
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(setq debugger-outer-standard-input standard-input)
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(setq debugger-outer-standard-output standard-output)
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(setq debugger-outer-inhibit-redisplay inhibit-redisplay)
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(setq debugger-outer-cursor-in-echo-area cursor-in-echo-area)
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))))
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(defun debugger-eval-expression (exp)
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"Eval an expression, in an environment like that outside the debugger."
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(interactive
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(list (read-from-minibuffer "Eval: "
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nil read-expression-map t
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'read-expression-history)))
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(debugger-env-macro (eval-expression exp)))
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(defvar debugger-mode-map nil)
|
||
(if debugger-mode-map
|
||
nil
|
||
(let ((loop ? ))
|
||
(setq debugger-mode-map (make-keymap))
|
||
(suppress-keymap debugger-mode-map)
|
||
(define-key debugger-mode-map "-" 'negative-argument)
|
||
(define-key debugger-mode-map "b" 'debugger-frame)
|
||
(define-key debugger-mode-map "c" 'debugger-continue)
|
||
(define-key debugger-mode-map "j" 'debugger-jump)
|
||
(define-key debugger-mode-map "r" 'debugger-return-value)
|
||
(define-key debugger-mode-map "u" 'debugger-frame-clear)
|
||
(define-key debugger-mode-map "d" 'debugger-step-through)
|
||
(define-key debugger-mode-map "l" 'debugger-list-functions)
|
||
(define-key debugger-mode-map "h" 'describe-mode)
|
||
(define-key debugger-mode-map "q" 'top-level)
|
||
(define-key debugger-mode-map "e" 'debugger-eval-expression)
|
||
(define-key debugger-mode-map " " 'next-line)
|
||
(define-key debugger-mode-map "R" 'debugger-record-expression)
|
||
))
|
||
|
||
|
||
(defcustom debugger-record-buffer "*Debugger-record*"
|
||
"*Buffer name for expression values, for \\[debugger-record-expression]."
|
||
:type 'string
|
||
:group 'debugger
|
||
:version "20.3")
|
||
|
||
(defun debugger-record-expression (exp)
|
||
"Display a variable's value and record it in `*Backtrace-record*' buffer."
|
||
(interactive
|
||
(list (read-from-minibuffer
|
||
"Record Eval: "
|
||
nil
|
||
read-expression-map t
|
||
'read-expression-history)))
|
||
(let* ((buffer (get-buffer-create debugger-record-buffer))
|
||
(standard-output buffer))
|
||
(princ (format "Debugger Eval (%s): " exp))
|
||
(princ (debugger-eval-expression exp))
|
||
(terpri))
|
||
|
||
(with-current-buffer (get-buffer debugger-record-buffer)
|
||
(save-excursion
|
||
(forward-line -1)
|
||
(message
|
||
(buffer-substring (point) (progn (end-of-line) (point)))))))
|
||
|
||
(put 'debugger-mode 'mode-class 'special)
|
||
|
||
(defun debugger-mode ()
|
||
"Mode for backtrace buffers, selected in debugger.
|
||
\\<debugger-mode-map>
|
||
A line starts with `*' if exiting that frame will call the debugger.
|
||
Type \\[debugger-frame] or \\[debugger-frame-clear] to set or remove the `*'.
|
||
|
||
When in debugger due to frame being exited,
|
||
use the \\[debugger-return-value] command to override the value
|
||
being returned from that frame.
|
||
|
||
Use \\[debug-on-entry] and \\[cancel-debug-on-entry] to control
|
||
which functions will enter the debugger when called.
|
||
|
||
Complete list of commands:
|
||
\\{debugger-mode-map}"
|
||
(kill-all-local-variables)
|
||
(setq major-mode 'debugger-mode)
|
||
(setq mode-name "Debugger")
|
||
(setq truncate-lines t)
|
||
(set-syntax-table emacs-lisp-mode-syntax-table)
|
||
(use-local-map debugger-mode-map)
|
||
(run-hooks 'debugger-mode-hook))
|
||
|
||
;;;###autoload
|
||
(defun debug-on-entry (function)
|
||
"Request FUNCTION to invoke debugger each time it is called.
|
||
If you tell the debugger to continue, FUNCTION's execution proceeds.
|
||
This works by modifying the definition of FUNCTION,
|
||
which must be written in Lisp, not predefined.
|
||
Use \\[cancel-debug-on-entry] to cancel the effect of this command.
|
||
Redefining FUNCTION also cancels it."
|
||
(interactive "aDebug on entry (to function): ")
|
||
(debugger-reenable)
|
||
;; Handle a function that has been aliased to some other function.
|
||
(if (symbolp (symbol-function function))
|
||
(fset function `(lambda (&rest debug-on-entry-args)
|
||
(apply ',(symbol-function function)
|
||
debug-on-entry-args))))
|
||
(if (subrp (symbol-function function))
|
||
(error "Function %s is a primitive" function))
|
||
(or (consp (symbol-function function))
|
||
(debug-convert-byte-code function))
|
||
(or (consp (symbol-function function))
|
||
(error "Definition of %s is not a list" function))
|
||
(fset function (debug-on-entry-1 function (symbol-function function) t))
|
||
(or (memq function debug-function-list)
|
||
(setq debug-function-list (cons function debug-function-list)))
|
||
function)
|
||
|
||
;;;###autoload
|
||
(defun cancel-debug-on-entry (&optional function)
|
||
"Undo effect of \\[debug-on-entry] on FUNCTION.
|
||
If argument is nil or an empty string, cancel for all functions."
|
||
(interactive
|
||
(list (let ((name
|
||
(completing-read "Cancel debug on entry (to function): "
|
||
;; Make an "alist" of the functions
|
||
;; that now have debug on entry.
|
||
(mapcar 'list
|
||
(mapcar 'symbol-name
|
||
debug-function-list))
|
||
nil t nil)))
|
||
(if name (intern name)))))
|
||
(debugger-reenable)
|
||
(if (and function (not (string= function "")))
|
||
(progn
|
||
(fset function
|
||
(debug-on-entry-1 function (symbol-function function) nil))
|
||
(setq debug-function-list (delq function debug-function-list))
|
||
function)
|
||
(message "Cancelling debug-on-entry for all functions")
|
||
(mapcar 'cancel-debug-on-entry debug-function-list)))
|
||
|
||
(defun debug-convert-byte-code (function)
|
||
(let ((defn (symbol-function function)))
|
||
(if (not (consp defn))
|
||
;; Assume a compiled code object.
|
||
(let* ((contents (append defn nil))
|
||
(body
|
||
(list (list 'byte-code (nth 1 contents)
|
||
(nth 2 contents) (nth 3 contents)))))
|
||
(if (nthcdr 5 contents)
|
||
(setq body (cons (list 'interactive (nth 5 contents)) body)))
|
||
(if (nth 4 contents)
|
||
;; Use `documentation' here, to get the actual string,
|
||
;; in case the compiled function has a reference
|
||
;; to the .elc file.
|
||
(setq body (cons (documentation function) body)))
|
||
(fset function (cons 'lambda (cons (car contents) body)))))))
|
||
|
||
(defun debug-on-entry-1 (function defn flag)
|
||
(if (subrp defn)
|
||
(error "%s is a built-in function" function)
|
||
(if (eq (car defn) 'macro)
|
||
(debug-on-entry-1 function (cdr defn) flag)
|
||
(or (eq (car defn) 'lambda)
|
||
(error "%s not user-defined Lisp function" function))
|
||
(let (tail prec)
|
||
(if (stringp (car (nthcdr 2 defn)))
|
||
(setq tail (nthcdr 3 defn)
|
||
prec (list (car defn) (car (cdr defn))
|
||
(car (cdr (cdr defn)))))
|
||
(setq tail (nthcdr 2 defn)
|
||
prec (list (car defn) (car (cdr defn)))))
|
||
(if (eq flag (equal (car tail) '(debug 'debug)))
|
||
defn
|
||
(if flag
|
||
(nconc prec (cons '(debug 'debug) tail))
|
||
(nconc prec (cdr tail))))))))
|
||
|
||
(defun debugger-list-functions ()
|
||
"Display a list of all the functions now set to debug on entry."
|
||
(interactive)
|
||
(with-output-to-temp-buffer "*Help*"
|
||
(if (null debug-function-list)
|
||
(princ "No debug-on-entry functions now\n")
|
||
(princ "Functions set to debug on entry:\n\n")
|
||
(let ((list debug-function-list))
|
||
(while list
|
||
(prin1 (car list))
|
||
(terpri)
|
||
(setq list (cdr list))))
|
||
(princ "Note: if you have redefined a function, then it may no longer\n")
|
||
(princ "be set to debug on entry, even if it is in the list."))
|
||
(save-excursion
|
||
(set-buffer standard-output)
|
||
(help-mode))))
|
||
|
||
(provide 'debug)
|
||
|
||
;;; debug.el ends here
|