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1 ;;; debug.el --- debuggers and related commands for XEmacs
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2
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3 ;; Copyright (C) 1985, 1986, 1993, 1994 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keyword: lisp, tools
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 ;;; Synched up with: FSF 19.30.
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26
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27 ;;; Code:
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28
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29 (defvar debug-function-list nil
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30 "List of functions currently set for debug on entry.")
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31
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32 (defvar debugger-step-after-exit nil
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33 "Non-nil means \"single-step\" after the debugger exits.")
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34
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35 (defvar debugger-value nil
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36 "This is the value for the debugger to return, when it returns.")
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37
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38 (defvar debugger-old-buffer nil
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39 "This is the buffer that was current when the debugger was entered.")
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40
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41 ;;#### This is terminally random an nigh-unmaintainable.
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42 ;;#### (need progv in elisp...)
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43 (defvar debugger-outer-match-data)
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44 (defvar debugger-outer-load-read-function)
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45 (defvar debugger-outer-overriding-local-map)
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46 ;; FSFmacs (defvar debugger-outer-track-mouse)
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47 (defvar debugger-outer-last-command)
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48 (defvar debugger-outer-this-command)
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49 (defvar debugger-outer-unread-command-event)
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50 (defvar debugger-outer-last-input-event)
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51 (defvar debugger-outer-last-input-char)
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52 (defvar debugger-outer-last-input-time)
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53 (defvar debugger-outer-last-command-event)
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54 (defvar debugger-outer-last-command-char)
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55 (defvar debugger-outer-standard-input)
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56 (defvar debugger-outer-standard-output)
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57 (defvar debugger-outer-cursor-in-echo-area)
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58
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59 ;;;don't ###autoload, loadup.el does something smarter.
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60 (setq debugger 'debug)
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61
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62 (defvar debugger-step-after-exit)
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63 (defvar debugger-old-buffer)
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64 (defvar debugger-value)
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65
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66 ;;;###autoload
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67 (defun debug (&rest debugger-args)
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68 "Enter debugger. To return, type \\<debugger-mode-map>`\\[debugger-continue]'.
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70
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69 Arguments are mainly for use when this is called
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70 from the internals of the evaluator.
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71 You may call with no args, or you may
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72 pass nil as the first arg and any other args you like.
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73 In that case, the list of args after the first will
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74 be printed into the backtrace buffer."
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75 (interactive)
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76 ;; XEmacs: it doesn't work to enter the debugger non-interactively
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77 ;; so just print out a backtrace and exit.
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78 (if (noninteractive) (apply 'early-error-handler debugger-args))
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79 (message "Entering debugger...")
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80 (let (debugger-value
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81 (debug-on-error nil)
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82 (debug-on-quit nil)
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83 (debug-on-signal nil)
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84 (debugger-buffer (let ((default-major-mode 'fundamental-mode))
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85 (get-buffer-create "*Backtrace*")))
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86 ;; #### I18N3 set the debugger-buffer to output-translating
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87 (debugger-old-buffer (current-buffer))
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88 (debugger-step-after-exit nil)
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89 ;; Don't keep reading from an executing kbd macro!
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90 (executing-macro nil)
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91 ;; Save the outer values of these vars for the `e' command
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92 ;; before we replace the values.
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93 (debugger-outer-match-data (match-data))
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94 (debugger-outer-load-read-function load-read-function)
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95 (debugger-outer-overriding-local-map overriding-local-map)
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96 ;; FSFmacs (debugger-outer-track-mouse track-mouse)
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97 (debugger-outer-last-command last-command)
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98 (debugger-outer-this-command this-command)
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99 (debugger-outer-unread-command-event unread-command-event)
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100 (debugger-outer-last-input-event last-input-event)
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101 (debugger-outer-last-input-char last-input-char)
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102 (debugger-outer-last-input-time last-input-time)
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103 (debugger-outer-last-command-event last-command-event)
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104 (debugger-outer-last-command-char last-command-char)
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105 (debugger-outer-standard-input standard-input)
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106 (debugger-outer-standard-output standard-output)
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107 (debugger-outer-cursor-in-echo-area cursor-in-echo-area)
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108 )
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109 ;; Don't let these magic variables affect the debugger itself.
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110 (unwind-protect ;XEmacs change
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111 (let ((last-command nil)
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112 (this-command nil)
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113 (unread-command-event nil)
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114 (last-input-event (allocate-event))
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115 (last-input-char -1)
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116 (last-input-time nil)
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117 (last-command-event (allocate-event))
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118 (last-command-char -1)
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119 overriding-local-map
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120 load-read-function
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121 (standard-input t)
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122 (standard-output t)
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123 (cursor-in-echo-area nil))
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124 (save-excursion
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125 (save-window-excursion
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126 (pop-to-buffer debugger-buffer)
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127 (erase-buffer)
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128 (let ((standard-output (current-buffer))
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129 (print-escape-newlines t)
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130 (print-length 50))
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131 (backtrace))
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132 (goto-char (point-min))
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133 (debugger-mode)
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134 (delete-region (point)
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135 (progn
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136 (re-search-forward "\n[* ] debug(")
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137 (forward-line 1)
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138 (point)))
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139 ;; lambda is for debug-on-call when a function call is next.
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140 ;; debug is for debug-on-entry function called.
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141 (debugger-reenable)
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142 (cond ((memq (car debugger-args) '(lambda debug))
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143 (insert "Entering:\n")
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144 (if (eq (car debugger-args) 'debug)
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145 (progn
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146 ;; Skip the frames for backtrace-debug, byte-code,
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147 ;; and debug.
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148 (backtrace-debug 3 t)
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149 (delete-char 1)
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150 (insert ?*)
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151 (beginning-of-line))))
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152 ;; Exiting a function.
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153 ((eq (car debugger-args) 'exit)
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154 (insert "Return value: ")
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155 (setq debugger-value (nth 1 debugger-args))
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156 (prin1 debugger-value (current-buffer))
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157 (insert ?\n)
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158 (delete-char 1)
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159 (insert ? )
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160 (beginning-of-line))
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161 ;; Debugger entered for an error.
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162 ((eq (car debugger-args) 'error)
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163 (insert "Signalling: ")
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164 (prin1 (nth 1 debugger-args) (current-buffer))
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165 (insert ?\n))
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166 ;; debug-on-call, when the next thing is an eval.
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167 ((eq (car debugger-args) t)
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168 (insert
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169 "Beginning evaluation of function call form:\n"))
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170 ;; User calls debug directly.
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171 (t
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172 (prin1 (if (eq (car debugger-args) 'nil)
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173 (cdr debugger-args) debugger-args)
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174 (current-buffer))
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175 (insert ?\n)))
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176 (message "")
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177 (let ((inhibit-trace t)
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178 (standard-output nil)
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179 (buffer-read-only t))
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180 (message nil)
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181 (recursive-edit)))
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182 debugger-value))
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183 ;; Kill or at least neuter the backtrace buffer, so that users
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184 ;; don't try to execute debugger commands in an invalid context.
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185 (if (get-buffer-window debugger-buffer 'visible)
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186 ;; Still visible despite the save-window-excursion? Maybe it
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187 ;; it's in a pop-up frame. It would be annoying to delete and
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188 ;; recreate it every time the debugger stops, so instead we'll
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189 ;; erase it but leave it visible.
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190 (save-excursion
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191 (set-buffer debugger-buffer)
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192 (erase-buffer)
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193 (fundamental-mode))
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194 (kill-buffer debugger-buffer))
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195 (store-match-data debugger-outer-match-data)
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196 ;; Put into effect the modified values of these variables
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197 ;; in case the user set them with the `e' command.
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198 (setq load-read-function debugger-outer-load-read-function)
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199 (setq overriding-local-map debugger-outer-overriding-local-map)
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200 ;; FSFmacs (setq track-mouse debugger-outer-track-mouse)
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201 (setq last-command debugger-outer-last-command)
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202 (setq this-command debugger-outer-this-command)
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203 (setq unread-command-event debugger-outer-unread-command-event)
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204 (setq last-input-event debugger-outer-last-input-event)
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205 (setq last-input-char debugger-outer-last-input-char)
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206 (setq last-input-time debugger-outer-last-input-time)
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207 (setq last-command-event debugger-outer-last-command-event)
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208 (setq last-command-char debugger-outer-last-command-char)
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209 (setq standard-input debugger-outer-standard-input)
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210 (setq standard-output debugger-outer-standard-output)
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211 (setq cursor-in-echo-area debugger-outer-cursor-in-echo-area)
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212 (setq debug-on-next-call debugger-step-after-exit) ;do this last!
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213 )))
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214
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215
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216 (defun debugger-exit ()
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217 (condition-case nil
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218 (let ((debug-on-error nil)
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219 (debug-on-signal nil))
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220 ;; Tell signal to keep searching for handlers
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221 (throw 'debugger t))
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222 ;; Called from an old version of Emacs, perhaps?
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223 (no-catch (exit-recursive-edit))))
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224
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225
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226 (defun debugger-step-through ()
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227 "Proceed, stepping through subexpressions of this expression.
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228 Enter another debugger on next entry to eval, apply or funcall."
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229 (interactive)
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230 (setq debugger-step-after-exit t)
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231 (message "Proceeding, will debug on next eval or call.")
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232 (debugger-exit))
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233
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234 (defun debugger-continue ()
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235 "Continue, evaluating this expression without stopping."
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236 (interactive)
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237 (message "Continuing.")
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238 (debugger-exit))
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239
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240 (defun debugger-return-value (val)
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241 "Continue, specifying value to return.
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242 This is only useful when the value returned from the debugger
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243 will be used, such as in a debug on exit from a frame."
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244 (interactive "XReturn value (evaluated): ")
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245 (setq debugger-value val)
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246 (princ "Returning " t)
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247 (prin1 debugger-value)
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248 (exit-recursive-edit))
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249
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250 ;; Chosen empirically to account for all the frames
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251 ;; that will exist when debugger-frame is called
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252 ;; within the first one that appears in the backtrace buffer.
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253 ;; Assumes debugger-frame is called from a key;
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254 ;; will be wrong if it is called with Meta-x.
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255 (defconst debugger-frame-offset 8 "")
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256
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257 (defun debugger-jump ()
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258 "Continue to exit from this frame, with all debug-on-entry suspended."
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259 (interactive)
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260 ;; Compensate for the two extra stack frames for debugger-jump.
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261 (let ((debugger-frame-offset (+ debugger-frame-offset 2)))
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262 (debugger-frame))
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263 ;; Turn off all debug-on-entry functions
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264 ;; but leave them in the list.
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265 (let ((list debug-function-list))
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266 (while list
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267 (fset (car list)
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268 (debug-on-entry-1 (car list) (symbol-function (car list)) nil))
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269 (setq list (cdr list))))
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270 (message "Continuing through this frame")
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271 (debugger-exit))
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272
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273 (defun debugger-reenable ()
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274 "Turn all debug-on-entry functions back on."
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275 (let ((list debug-function-list))
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276 (while list
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277 (or (consp (symbol-function (car list)))
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278 (debug-convert-byte-code (car list)))
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279 (fset (car list)
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280 (debug-on-entry-1 (car list) (symbol-function (car list)) t))
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281 (setq list (cdr list)))))
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282
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283 (defun debugger-frame-number ()
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284 "Return number of frames in backtrace before the one point points at."
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285 (save-excursion
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286 (beginning-of-line)
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287 (let ((opoint (point))
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288 (count 0))
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289 (goto-char (point-min))
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290 ;; #### I18N3 will not localize properly!
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291 (if (or (equal (buffer-substring (point) (+ (point) 6))
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292 (gettext "Signal"))
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293 (equal (buffer-substring (point) (+ (point) 6))
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294 (gettext "Return")))
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295 (progn
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296 (search-forward ":")
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297 (forward-sexp 1)))
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298 (forward-line 1)
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299 (while (progn
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300 (forward-char 2)
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301 (if (= (following-char) ?\()
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302 (forward-sexp 1)
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303 (forward-sexp 2))
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304 (forward-line 1)
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305 (<= (point) opoint))
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306 (setq count (1+ count)))
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307 count)))
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308
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309 (defun debugger-frame ()
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310 "Request entry to debugger when this frame exits.
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311 Applies to the frame whose line point is on in the backtrace."
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312 (interactive)
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313 (beginning-of-line)
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314 (let ((level (debugger-frame-number)))
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315 (backtrace-debug (+ level debugger-frame-offset) t))
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316 (if (= (following-char) ? )
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317 (let ((buffer-read-only nil))
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318 (delete-char 1)
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319 (insert ?*)))
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320 (beginning-of-line))
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321
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322 (defun debugger-frame-clear ()
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323 "Do not enter to debugger when this frame exits.
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324 Applies to the frame whose line point is on in the backtrace."
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325 (interactive)
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326 (beginning-of-line)
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327 (let ((level (debugger-frame-number)))
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328 (backtrace-debug (+ level debugger-frame-offset) nil))
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329 (if (= (following-char) ?*)
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330 (let ((buffer-read-only nil))
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331 (delete-char 1)
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332 (insert ? )))
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333 (beginning-of-line))
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334
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335 (defun debugger-eval-expression (debugger-exp)
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336 "Eval an expression, in an environment like that outside the debugger."
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337 (interactive
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338 (list (read-from-minibuffer "Eval: "
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339 nil read-expression-map t
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340 'read-expression-history)))
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341 (save-excursion
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342 (if (null (buffer-name debugger-old-buffer))
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343 ;; old buffer deleted
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344 (setq debugger-old-buffer (current-buffer)))
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345 (set-buffer debugger-old-buffer)
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346 (let ((last-command debugger-outer-last-command)
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347 (this-command debugger-outer-this-command)
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348 (unread-command-event debugger-outer-unread-command-event)
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349 (last-input-event debugger-outer-last-input-event)
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350 (last-input-char debugger-outer-last-input-char)
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351 (last-input-time debugger-outer-last-input-time)
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352 (last-command-event debugger-outer-last-command-event)
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353 (last-command-char debugger-outer-last-command-char)
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354 (standard-input debugger-outer-standard-input)
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355 (standard-output debugger-outer-standard-output)
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356 (cursor-in-echo-area debugger-outer-cursor-in-echo-area)
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357 (overriding-local-map debugger-outer-overriding-local-map)
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358 (load-read-function debugger-outer-load-read-function))
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359 (store-match-data debugger-outer-match-data)
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360 (prog1 (eval-expression debugger-exp)
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361 (setq debugger-outer-match-data (match-data)
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362 debugger-outer-load-read-function load-read-function
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363 debugger-outer-overriding-local-map overriding-local-map
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364 debugger-outer-last-command last-command
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365 debugger-outer-this-command this-command
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366 debugger-outer-unread-command-event unread-command-event
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367 debugger-outer-last-input-event last-input-event
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368 debugger-outer-last-input-char last-input-char
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369 debugger-outer-last-input-time last-input-time
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370 debugger-outer-last-command-event last-command-event
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371 debugger-outer-last-command-char last-command-char
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372 debugger-outer-standard-input standard-input
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373 debugger-outer-standard-output standard-output
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374 debugger-outer-cursor-in-echo-area cursor-in-echo-area)))))
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375
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70
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376 (defvar debugger-mode-map
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377 (let ((map (make-keymap)))
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378 (set-keymap-name map 'debugger-mode-map)
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379 (suppress-keymap map)
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380 (define-key map "-" 'negative-argument)
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381 (define-key map "b" 'debugger-frame)
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382 (define-key map "c" 'debugger-continue)
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383 (define-key map "j" 'debugger-jump)
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384 (define-key map "r" 'debugger-return-value)
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385 (define-key map "u" 'debugger-frame-clear)
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386 (define-key map "d" 'debugger-step-through)
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387 (define-key map "l" 'debugger-list-functions)
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388 (define-key map "h" 'describe-mode)
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389 (define-key map "q" 'top-level)
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390 (define-key map "e" 'debugger-eval-expression)
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391 (define-key map " " 'next-line)
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392 map))
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0
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393
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394 (put 'debugger-mode 'mode-class 'special)
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395
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396 (defun debugger-mode ()
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397 "Mode for backtrace buffers, selected in debugger.
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398 \\<debugger-mode-map>
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399 A line starts with `*' if exiting that frame will call the debugger.
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400 Type \\[debugger-frame] or \\[debugger-frame-clear] to set or remove the `*'.
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401
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402 When in debugger due to frame being exited,
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403 use the \\[debugger-return-value] command to override the value
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404 being returned from that frame.
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405
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406 Use \\[debug-on-entry] and \\[cancel-debug-on-entry] to control
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407 which functions will enter the debugger when called.
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408
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409 Complete list of commands:
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410 \\{debugger-mode-map}"
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411 (kill-all-local-variables)
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412 (setq major-mode 'debugger-mode)
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70
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413 (setq mode-name (gettext "Debugger"))
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0
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414 (setq truncate-lines t)
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415 (set-syntax-table emacs-lisp-mode-syntax-table)
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416 (use-local-map debugger-mode-map))
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417
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418 ;;;###autoload
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419 (defun debug-on-entry (function)
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420 "Request FUNCTION to invoke debugger each time it is called.
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421 If you tell the debugger to continue, FUNCTION's execution proceeds.
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422 This works by modifying the definition of FUNCTION,
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423 which must be written in Lisp, not predefined.
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424 Use \\[cancel-debug-on-entry] to cancel the effect of this command.
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425 Redefining FUNCTION also cancels it."
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426 (interactive "aDebug on entry (to function): ")
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427 (debugger-reenable)
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428 (if (subrp (symbol-function function))
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429 (error "Function %s is a primitive" function))
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430 (or (consp (symbol-function function))
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431 (debug-convert-byte-code function))
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432 (or (consp (symbol-function function))
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433 (error "Definition of %s is not a list" function))
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434 (fset function (debug-on-entry-1 function (symbol-function function) t))
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435 (or (memq function debug-function-list)
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436 (setq debug-function-list (cons function debug-function-list)))
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437 function)
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438
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439 ;;;###autoload
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440 (defun cancel-debug-on-entry (&optional function)
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441 "Undo effect of \\[debug-on-entry] on FUNCTION.
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442 If argument is nil or an empty string, cancel for all functions."
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443 (interactive
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444 (list (let ((name
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70
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445 (completing-read "Cancel debug on entry (to function): "
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446 ;; Make an "alist" of the functions
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0
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447 ;; that now have debug on entry.
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70
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448 (mapcar 'list (mapcar 'symbol-name
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449 debug-function-list))
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0
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450 nil t nil)))
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451 (if name (intern name)))))
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452 (debugger-reenable)
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453 (if (and function (not (string= function "")))
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454 (progn
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455 (fset function
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456 (debug-on-entry-1 function (symbol-function function) nil))
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457 (setq debug-function-list (delq function debug-function-list))
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458 function)
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459 (message "Cancelling debug-on-entry for all functions")
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460 (mapcar 'cancel-debug-on-entry debug-function-list)))
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461
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462 (defun debug-convert-byte-code (function)
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463 (let ((defn (symbol-function function)))
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464 (if (not (consp defn))
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465 ;; Assume a compiled code object.
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466 (let* ((contents (append defn nil))
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467 (body
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468 (list (list 'byte-code (nth 1 contents)
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469 (nth 2 contents) (nth 3 contents)))))
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470 (if (nthcdr 5 contents)
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471 (setq body (cons (list 'interactive (nth 5 contents)) body)))
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472 (if (nth 4 contents)
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473 ;; Use `documentation' here, to get the actual string,
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474 ;; in case the compiled function has a reference
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475 ;; to the .elc file.
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476 (setq body (cons (documentation function) body)))
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477 (fset function (cons 'lambda (cons (car contents) body)))))))
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478
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479 (defun debug-on-entry-1 (function defn flag)
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480 (if (subrp defn)
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481 (error "%s is a built-in function" function)
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482 (if (eq (car defn) 'macro)
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483 (debug-on-entry-1 function (cdr defn) flag)
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484 (or (eq (car defn) 'lambda)
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485 (error "%s not user-defined Lisp function" function))
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486 (let (tail prec)
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487 (if (stringp (car (nthcdr 2 defn)))
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488 (setq tail (nthcdr 3 defn)
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70
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489 prec (list (car defn) (car (cdr defn)) (car (cdr (cdr defn)))))
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0
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490 (setq tail (nthcdr 2 defn)
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491 prec (list (car defn) (car (cdr defn)))))
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492 (if (eq flag (equal (car tail) '(debug 'debug)))
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493 defn
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494 (if flag
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495 (nconc prec (cons '(debug 'debug) tail))
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496 (nconc prec (cdr tail))))))))
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497
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498 (defun debugger-list-functions ()
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499 "Display a list of all the functions now set to debug on entry."
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500 (interactive)
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501 (with-output-to-temp-buffer "*Help*"
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502 (if (null debug-function-list)
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503 (princ "No debug-on-entry functions now\n")
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504 (princ "Functions set to debug on entry:\n\n")
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505 (let ((list debug-function-list))
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506 (while list
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507 (prin1 (car list))
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508 (terpri)
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509 (setq list (cdr list))))
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510 (princ "Note: if you have redefined a function, then it may no longer\n")
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511 (princ "be set to debug on entry, even if it is in the list."))
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512 (save-excursion
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513 (set-buffer standard-output)
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514 (help-mode))))
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515
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516 ;;; debug.el ends here
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