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1 ;;; find-gc.el --- detect functions that call the garbage collector
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2
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3 ;; Copyright (C) 1992 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: maint
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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 Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;;; #### before this is really usable, it should be rewritten to call
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27 ;;; Makefile to compile the files.
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28
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29 ;;; Commentary:
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30
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31 ;;; Produce in unsafe-list the set of all functions that may invoke GC.
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32 ;;; This expects the Emacs sources to live in emacs-source-directory.
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33 ;;; It creates a temporary working directory /tmp/esrc.
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34
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35 ;;; Code:
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36
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37 ;; Set this to point to your XEmacs source directory.
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38 (setq emacs-source-directory "/net/prosper/opt/xemacs/editor/src")
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39
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40 ;; Set this to the include directories neeed for compilation.
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41 (setq include-directives "-I/net/prosper/opt/xemacs/editor/src -I/usr/dt/include -I/net/prosper/opt/SUNWmotif/include -I/net/prosper/opt/xemacs/editor/import/xpm/include -I/net/prosper/opt/xemacs/editor/import/include -I/usr/demo/SOUND/include -I/usr/openwin/include -I/usr/openwin/include/desktop -I/usr/openwin/include/desktop -I/net/prosper/opt/xemacs/editor/src/../lwlib -g -v -DNeedFunctionPrototypes -xildoff -I/usr/dt/include -I/net/prosper/opt/SUNWmotif/include -I/net/prosper/opt/xemacs/editor/import/xpm/include -I/net/prosper/opt/xemacs/editor/import/include -I/usr/demo/SOUND/include -I/usr/demo/SOUND/include")
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42
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43 ;; Set this to the source files you want to check.
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44 (setq source-files
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45 '(
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46 "EmacsFrame.c" "EmacsManager.c" "EmacsShell.c" "abbrev.c" "alloc.c"
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47 "blocktype.c" "buffer.c" "bytecode.c" "callint.c" "callproc.c" "casefiddle.c"
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48 "casetab.c" "cm.c" "cmds.c" "data.c" "debug.c" "device-stream.c"
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49 "device-tty.c" "device-x.c" "device.c" "dired.c" "doc.c" "doprnt.c"
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50 "dynarr.c""editfns.c" "elhash.c" "emacs.c" "eval.c" "event-Xt.c"
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51 "event-stream.c" "event-tty.c" "events.c" "extents.c" "faces.c" "fileio.c"
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52 "filelock.c" "filemode.c" "floatfns.c" "fns.c" "font-lock.c" "frame-tty.c"
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53 "frame-x.c" "frame.c" "getloadavg.c" "glyphs.c" "gmalloc.c" "hash.c"
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54 "indent.c" "insdel.c" "intl.c" "keyboard.c" "keymap.c" "lastfile.c" "lread.c"
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55 "lstream.c" "macros.c" "marker.c" "md5.c" "menubar-x.c" "menubar.c"
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56 "minibuf.c" "objects-x.c" "objects.c" "opaque.c" "print.c" "process.c"
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57 "pure.c" "redisplay-output.c" "redisplay-tty.c" "redisplay-x.c" "redisplay.c"
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58 "regex.c" "scrollbar.c" "search.c" "sound.c" "specifier.c" "sunplay.c"
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59 "sunpro.c" "symbols.c" "syntax.c" "sysdep.c" "terminfo.c" "toolbar-x.c"
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60 "toolbar.c" "tooltalk.c" "undo.c" "unexsol2.c" "vm-limit.c" "window.c"
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61 "xgccache.c" "xselect.c"))
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62
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63 ;;;
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64
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65 (defun find-gc-unsafe ()
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66 (trace-call-tree nil)
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67 (trace-use-tree)
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68 (find-unsafe-funcs 'Fgarbage_collect)
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69 (setq unsafe-list (sort unsafe-list
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70 (function (lambda (x y)
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71 (string-lessp (car x) (car y))))))
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72 (princ (format "%s\n" unsafe-list))
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73 (setq unsafe-list nil)
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74 (find-unsafe-funcs 'Fgarbage_collect_1)
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75 (setq unsafe-list (sort unsafe-list
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76 (function (lambda (x y)
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77 (string-lessp (car x) (car y))))))
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78 (princ (format "%s\n" unsafe-list)))
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79
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80
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81 ;;; This does a depth-first search to find all functions that can
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82 ;;; ultimately call the function "target". The result is an a-list
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83 ;;; in unsafe-list; the cars are the unsafe functions, and the cdrs
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84 ;;; are (one of) the unsafe functions that these functions directly
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85 ;;; call.
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86
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87 (defun find-unsafe-funcs (target)
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88 (setq unsafe-list (list (list target)))
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89 (trace-unsafe target))
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90
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91 (defun trace-unsafe (func)
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92 (let ((used (assq func subrs-used)))
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93 (or used
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94 (error "No subrs-used for %s" (car unsafe-list)))
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95 (while (setq used (cdr used))
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96 (or (assq (car used) unsafe-list)
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97 (memq (car used) noreturn-list)
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98 (progn
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99 (setq unsafe-list (cons (cons (car used) func) unsafe-list))
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100 (trace-unsafe (car used)))))))
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101
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102
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103 ;;; Functions on this list are safe, even if they appear to be able
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104 ;;; to call the target.
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105
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106 (setq noreturn-list '( signal_error error Fthrow wrong_type_argument ))
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107
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108
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109 ;;; This produces an a-list of functions in subrs-called. The cdr of
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110 ;;; each entry is a list of functions which the function in car calls.
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111
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112 (defun trace-call-tree (&optional already-setup)
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113 (or already-setup
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114 (progn
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115 (princ (format "Setting up directories...\n"))
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116 ;; Gee, wouldn't a built-in "system" function be handy here.
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117 (call-process "sh" nil nil nil "-c" "rm -rf /tmp/esrc")
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118 (call-process "sh" nil nil nil "-c" "mkdir /tmp/esrc")
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119 (call-process "sh" nil nil nil "-c"
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120 (format "ln -s %s/*.[ch] /tmp/esrc"
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121 emacs-source-directory))))
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122 (save-excursion
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123 (set-buffer (get-buffer-create "*Trace Call Tree*"))
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124 (setq subrs-called nil)
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125 (let ((case-fold-search nil)
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126 (files source-files)
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127 name entry)
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128 (while files
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129 (princ (format "Compiling %s...\n" (car files)))
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130 (call-process "sh" nil nil nil "-c"
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131 (format "cd /tmp/esrc; gcc -dr -c %s /tmp/esrc/%s -o /dev/null"
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132 include-directives (car files)))
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133 (erase-buffer)
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134 (insert-file-contents (concat "/tmp/esrc/" (car files) ".rtl"))
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135 (while (re-search-forward ";; Function \\|(call_insn " nil t)
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136 (if (= (char-after (- (point) 3)) ?o)
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137 (progn
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138 (looking-at "[a-zA-Z0-9_]+")
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139 (setq name (intern (buffer-substring (match-beginning 0)
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140 (match-end 0))))
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141 (princ (format "%s : %s\n" (car files) name))
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142 (setq entry (list name)
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143 subrs-called (cons entry subrs-called)))
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144 (if (looking-at ".*\n?.*\"\\([A-Za-z0-9_]+\\)\"")
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145 (progn
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146 (setq name (intern (buffer-substring (match-beginning 1)
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147 (match-end 1))))
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148 (or (memq name (cdr entry))
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149 (setcdr entry (cons name (cdr entry))))))))
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150 ;;(delete-file (concat "/tmp/esrc/" (car files) ".rtl"))
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151 (setq files (cdr files))))))
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152
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153
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154 ;;; This produces an inverted a-list in subrs-used. The cdr of each
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155 ;;; entry is a list of functions that call the function in car.
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156
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157 (defun trace-use-tree ()
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158 (setq subrs-used (mapcar 'list (mapcar 'car subrs-called)))
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159 (let ((ptr subrs-called)
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160 p2 found)
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161 (while ptr
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162 (setq p2 (car ptr))
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163 (while (setq p2 (cdr p2))
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164 (if (setq found (assq (car p2) subrs-used))
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165 (setcdr found (cons (car (car ptr)) (cdr found)))))
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166 (setq ptr (cdr ptr)))))
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167
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168 ;;; find-gc.el ends here
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