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;;; find-gc.el --- detect functions that call the garbage collector
;; Copyright (C) 1992 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: maint
;; This file is part of XEmacs.
;; XEmacs 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.
;; XEmacs 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 XEmacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Synched up with: FSF 19.30.
;;; #### before this is really usable, it should be rewritten to call
;;; Makefile to compile the files.
;;; 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:
(defvar unsafe-list nil)
(defvar subrs-used nil)
(defvar subrs-called nil)
;; Set this to point to your XEmacs source directory.
(defvar emacs-source-directory "/usr/src/xemacs/xemacs-20/src")
;;; Functions on this list are safe, even if they appear to be able
;;; to call the target.
(defvar noreturn-list '(signal_error error Fthrow wrong_type_argument))
;;; Try to load generated source-files
(load-library (concat emacs-source-directory "/../lisp/source-files.el"))
(defvar source-files nil
"Set this to the source files you want to check.")
;;;
(defun find-gc-unsafe ()
(setq subrs-used nil)
(trace-call-tree t nil)
(trace-use-tree)
(set-buffer (get-buffer-create "*gc-tmp*"))
(erase-buffer)
(find-unsafe-funcs 'Fgarbage_collect)
(setq unsafe-list (sort unsafe-list 'find-gc-sort-p))
(insert (format "%s\n" unsafe-list))
(setq unsafe-list nil)
(find-unsafe-funcs 'garbage_collect_1)
(setq unsafe-list (sort unsafe-list 'find-gc-sort-p))
(insert (format "%s\n" unsafe-list))
(goto-char (point-min))
(while (search-forward ") (" nil t)
(replace-match ")
(" nil t))
)
(defun find-gc-sort-p (x y)
(string-lessp (car x) (car y)))
;;; 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)))))))
;;; 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 make-all delete-after)
(save-excursion
(setq subrs-called nil)
(let ((case-fold-search nil)
name entry file)
;; Stage one, make rtl files with make
(if make-all
(call-process
"sh" nil nil nil "-c"
(format "cd %s; make dortl" emacs-source-directory file))
(dolist (file source-files)
(princ (format "Compiling %s...\n" file))
(call-process
"sh" nil nil nil "-c"
(format "cd %s; make %s.rtl" emacs-source-directory file))))
(set-buffer (get-buffer-create "*Trace Call Tree*"))
;; Stage two, process them
(dolist (file source-files)
(erase-buffer)
(insert-file-contents (concat emacs-source-directory "/" file ".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))))
(princ (format "%s : %s\n" file 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)))))))))
(when delete-after
(dolist (file source-files)
(delete-file (concat emacs-source-directory "/" file ".rtl"))))
)))
;;; 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)))))
;;; find-gc.el ends here
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