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150 lines
5.0 KiB
EmacsLisp
150 lines
5.0 KiB
EmacsLisp
;;; find-gc.el --- detect functions that call the garbage collector
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;; Copyright (C) 1992 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;; Code:
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;;; Produce in unsafe-list the set of all functions that may invoke GC.
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;;; This expects the Emacs sources to live in emacs-source-directory.
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;;; It creates a temporary working directory /tmp/esrc.
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(defun find-gc-unsafe ()
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(trace-call-tree nil)
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(trace-use-tree)
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(find-unsafe-funcs 'Fgarbage_collect)
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(setq unsafe-list (sort unsafe-list
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(function (lambda (x y)
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(string-lessp (car x) (car y))))))
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)
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(setq emacs-source-directory "/usr/gnu/src/dist/src")
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;;; This does a depth-first search to find all functions that can
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;;; ultimately call the function "target". The result is an a-list
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;;; in unsafe-list; the cars are the unsafe functions, and the cdrs
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;;; are (one of) the unsafe functions that these functions directly
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;;; call.
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(defun find-unsafe-funcs (target)
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(setq unsafe-list (list (list target)))
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(trace-unsafe target)
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)
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(defun trace-unsafe (func)
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(let ((used (assq func subrs-used)))
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(or used
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(error "No subrs-used for %s" (car unsafe-list)))
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(while (setq used (cdr used))
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(or (assq (car used) unsafe-list)
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(memq (car used) noreturn-list)
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(progn
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(setq unsafe-list (cons (cons (car used) func) unsafe-list))
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(trace-unsafe (car used))))))
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)
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;;; Functions on this list are safe, even if they appear to be able
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;;; to call the target.
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(setq noreturn-list '( Fsignal Fthrow wrong_type_argument ))
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;;; This produces an a-list of functions in subrs-called. The cdr of
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;;; each entry is a list of functions which the function in car calls.
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(defun trace-call-tree (&optional already-setup)
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(message "Setting up directories...")
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(or already-setup
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(progn
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;; Gee, wouldn't a built-in "system" function be handy here.
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(call-process "csh" nil nil nil "-c" "rm -rf /tmp/esrc")
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(call-process "csh" nil nil nil "-c" "mkdir /tmp/esrc")
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(call-process "csh" nil nil nil "-c"
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(format "ln -s %s/*.[ch] /tmp/esrc"
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emacs-source-directory))))
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(save-excursion
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(set-buffer (get-buffer-create "*Trace Call Tree*"))
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(setq subrs-called nil)
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(let ((case-fold-search nil)
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(files source-files)
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name entry)
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(while files
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(message "Compiling %s..." (car files))
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(call-process "csh" nil nil nil "-c"
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(format "gcc -dr -c /tmp/esrc/%s -o /dev/null"
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(car files)))
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(erase-buffer)
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(insert-file-contents (concat "/tmp/esrc/" (car files) ".rtl"))
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(while (re-search-forward ";; Function \\|(call_insn " nil t)
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(if (= (char-after (- (point) 3)) ?o)
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(progn
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(looking-at "[a-zA-Z0-9_]+")
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(setq name (intern (buffer-substring (match-beginning 0)
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(match-end 0))))
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(message "%s : %s" (car files) name)
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(setq entry (list name)
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subrs-called (cons entry subrs-called)))
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(if (looking-at ".*\n?.*\"\\([A-Za-z0-9_]+\\)\"")
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(progn
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(setq name (intern (buffer-substring (match-beginning 1)
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(match-end 1))))
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(or (memq name (cdr entry))
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(setcdr entry (cons name (cdr entry))))))))
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(delete-file (concat "/tmp/esrc/" (car files) ".rtl"))
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(setq files (cdr files)))))
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)
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;;; This was originally generated directory-files, but there were
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;;; too many files there that were not actually compiled. The
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;;; list below was created for a HP-UX 7.0 system.
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(setq source-files '("dispnew.c" "scroll.c" "xdisp.c" "window.c"
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"term.c" "cm.c" "emacs.c" "keyboard.c" "macros.c"
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"keymap.c" "sysdep.c" "buffer.c" "filelock.c"
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"insdel.c" "marker.c" "minibuf.c" "fileio.c"
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"dired.c" "filemode.c" "cmds.c" "casefiddle.c"
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"indent.c" "search.c" "regex.c" "undo.c"
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"alloc.c" "data.c" "doc.c" "editfns.c"
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"callint.c" "eval.c" "fns.c" "print.c" "lread.c"
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"abbrev.c" "syntax.c" "unexec.c" "mocklisp.c"
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"bytecode.c" "process.c" "callproc.c" "doprnt.c"
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"x11term.c" "x11fns.c"))
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;;; This produces an inverted a-list in subrs-used. The cdr of each
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;;; entry is a list of functions that call the function in car.
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(defun trace-use-tree ()
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(setq subrs-used (mapcar 'list (mapcar 'car subrs-called)))
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(let ((ptr subrs-called)
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p2 found)
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(while ptr
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(setq p2 (car ptr))
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(while (setq p2 (cdr p2))
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(if (setq found (assq (car p2) subrs-used))
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(setcdr found (cons (car (car ptr)) (cdr found)))))
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(setq ptr (cdr ptr))))
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)
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;;; find-gc.el ends here
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