--- /dev/null
+;;; 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" "mocklisp.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)
+
+;;; find-gc.el ends here
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