[Emacs-diffs] Changes to emacs/lisp/emacs-lisp/find-gc.el [lexbind]

[Miles Bader]

Index: emacs/lisp/emacs-lisp/find-gc.el
diff -c /dev/null emacs/lisp/emacs-lisp/find-gc.el:1.2.4.1
*** /dev/null   Tue Oct 14 19:32:25 2003
--- emacs/lisp/emacs-lisp/find-gc.el    Tue Oct 14 19:32:21 2003
***************
*** 0 ****
--- 1,155 ----
+ ;;; find-gc.el --- detect functions that call the garbage collector
+ 
+ ;; Copyright (C) 1992 Free Software Foundation, Inc.
+ 
+ ;; Maintainer: FSF
+ 
+ ;; This file is part of GNU Emacs.
+ 
+ ;; GNU Emacs is free software; you can redistribute it and/or modify
+ ;; it under the terms of the GNU General Public License as published by
+ ;; the Free Software Foundation; either version 2, or (at your option)
+ ;; any later version.
+ 
+ ;; GNU Emacs is distributed in the hope that it will be useful,
+ ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+ ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ ;; GNU General Public License for more details.
+ 
+ ;; You should have received a copy of the GNU General Public License
+ ;; along with GNU Emacs; see the file COPYING.  If not, write to the
+ ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ ;; Boston, MA 02111-1307, USA.
+ 
+ ;;; Commentary:
+ 
+ ;; Produce in unsafe-list the set of all functions that may invoke GC.
+ ;; This expects the Emacs sources to live in emacs-source-directory.
+ ;; It creates a temporary working directory /tmp/esrc.
+ 
+ ;;; Code:
+ 
+ (defun find-gc-unsafe ()
+   (trace-call-tree nil)
+   (trace-use-tree)
+   (find-unsafe-funcs 'Fgarbage_collect)
+   (setq unsafe-list (sort unsafe-list
+                         (function (lambda (x y)
+                                     (string-lessp (car x) (car y))))))
+ )
+ 
+ (setq emacs-source-directory "/usr/gnu/src/dist/src")
+ 
+ 
+ ;;; This does a depth-first search to find all functions that can
+ ;;; ultimately call the function "target".  The result is an a-list
+ ;;; in unsafe-list; the cars are the unsafe functions, and the cdrs
+ ;;; are (one of) the unsafe functions that these functions directly
+ ;;; call.
+ 
+ (defun find-unsafe-funcs (target)
+   (setq unsafe-list (list (list target)))
+   (trace-unsafe target)
+ )
+ 
+ (defun trace-unsafe (func)
+   (let ((used (assq func subrs-used)))
+     (or used
+       (error "No subrs-used for %s" (car unsafe-list)))
+     (while (setq used (cdr used))
+       (or (assq (car used) unsafe-list)
+         (memq (car used) noreturn-list)
+         (progn
+           (setq unsafe-list (cons (cons (car used) func) unsafe-list))
+           (trace-unsafe (car used))))))
+ )
+ 
+ 
+ ;;; Functions on this list are safe, even if they appear to be able
+ ;;; to call the target.
+ 
+ (setq noreturn-list '( Fsignal Fthrow wrong_type_argument ))
+ 
+ 
+ ;;; This produces an a-list of functions in subrs-called.  The cdr of
+ ;;; each entry is a list of functions which the function in car calls.
+ 
+ (defun trace-call-tree (&optional already-setup)
+   (message "Setting up directories...")
+   (or already-setup
+       (progn
+       ;; Gee, wouldn't a built-in "system" function be handy here.
+       (call-process "csh" nil nil nil "-c" "rm -rf /tmp/esrc")
+       (call-process "csh" nil nil nil "-c" "mkdir /tmp/esrc")
+       (call-process "csh" nil nil nil "-c"
+                     (format "ln -s %s/*.[ch] /tmp/esrc"
+                             emacs-source-directory))))
+   (save-excursion
+     (set-buffer (get-buffer-create "*Trace Call Tree*"))
+     (setq subrs-called nil)
+     (let ((case-fold-search nil)
+         (files source-files)
+         name entry)
+       (while files
+       (message "Compiling %s..." (car files))
+       (call-process "csh" nil nil nil "-c"
+                     (format "gcc -dr -c /tmp/esrc/%s -o /dev/null"
+                             (car files)))
+       (erase-buffer)
+       (insert-file-contents (concat "/tmp/esrc/" (car files) ".rtl"))
+       (while (re-search-forward ";; Function \\|(call_insn " nil t)
+         (if (= (char-after (- (point) 3)) ?o)
+             (progn
+               (looking-at "[a-zA-Z0-9_]+")
+               (setq name (intern (buffer-substring (match-beginning 0)
+                                                    (match-end 0))))
+               (message "%s : %s" (car files) name)
+               (setq entry (list name)
+                     subrs-called (cons entry subrs-called)))
+           (if (looking-at ".*\n?.*\"\\([A-Za-z0-9_]+\\)\"")
+               (progn
+                 (setq name (intern (buffer-substring (match-beginning 1)
+                                                      (match-end 1))))
+                 (or (memq name (cdr entry))
+                     (setcdr entry (cons name (cdr entry))))))))
+       (delete-file (concat "/tmp/esrc/" (car files) ".rtl"))
+       (setq files (cdr files)))))
+ )
+ 
+ 
+ ;;; This was originally generated directory-files, but there were
+ ;;; too many files there that were not actually compiled.  The
+ ;;; list below was created for a HP-UX 7.0 system.
+ 
+ (setq source-files '("dispnew.c" "scroll.c" "xdisp.c" "window.c"
+                    "term.c" "cm.c" "emacs.c" "keyboard.c" "macros.c"
+                    "keymap.c" "sysdep.c" "buffer.c" "filelock.c"
+                    "insdel.c" "marker.c" "minibuf.c" "fileio.c"
+                    "dired.c" "filemode.c" "cmds.c" "casefiddle.c"
+                    "indent.c" "search.c" "regex.c" "undo.c"
+                    "alloc.c" "data.c" "doc.c" "editfns.c"
+                    "callint.c" "eval.c" "fns.c" "print.c" "lread.c"
+                    "abbrev.c" "syntax.c" "unexec.c"
+                    "bytecode.c" "process.c" "callproc.c" "doprnt.c"
+                    "x11term.c" "x11fns.c"))
+ 
+ 
+ ;;; This produces an inverted a-list in subrs-used.  The cdr of each
+ ;;; entry is a list of functions that call the function in car.
+ 
+ (defun trace-use-tree ()
+   (setq subrs-used (mapcar 'list (mapcar 'car subrs-called)))
+   (let ((ptr subrs-called)
+       p2 found)
+     (while ptr
+       (setq p2 (car ptr))
+       (while (setq p2 (cdr p2))
+       (if (setq found (assq (car p2) subrs-used))
+           (setcdr found (cons (car (car ptr)) (cdr found)))))
+       (setq ptr (cdr ptr))))
+ )
+ 
+ (provide 'find-gc)
+ 
+ ;;; arch-tag: 4a26a538-a008-40d9-a1ef-23bb6dbecef4
+ ;;; find-gc.el ends here