ilisp / cmulisp.lisp

;;; -*- Mode: Lisp -*-

;;; cmulisp.lisp --

;;; This file is part of ILISP.
;;; Version: 5.8
;;; Copyright (C) 1990, 1991, 1992, 1993 Chris McConnell
;;;               1993, 1994 Ivan Vasquez
;;;               1994, 1995, 1996 Marco Antoniotti and Rick Busdiecker
;;;               1996 Marco Antoniotti and Rick Campbell
;;; Other authors' names for which this Copyright notice also holds
;;; may appear later in this file.
;;; Send mail to '' to be included in the
;;; ILISP mailing list. '' is the general ILISP
;;; mailing list were bugs and improvements are discussed.
;;; ILISP is freely redistributable under the terms found in the file

;;; Todd Kaufmann    May 1990
;;; Make CMU CL run better within GNU inferior-lisp (by ccm).

(in-package "ILISP")

;;;% CMU CL does not define defun as a macro
(defun ilisp-compile (form package filename)
  "Compile FORM in PACKAGE recording FILENAME as the source file."
    (format nil "(funcall (compile nil '(lambda () ~A)))" form)
    package filename)))

;;;% Stream settings, when running connected to pipes.
;;; This fixes a problem when running piped: When CMU is running as a piped
;;; process, *terminal-io* really is a terminal; ie, /dev/tty.  This means an
;;; error will cause lisp to stop and wait for input from /dev/tty, which it
;;; won't be able to grab, and you'll have to restart your lisp.  But we want
;;; it to use the same input that the user is typing in, ie, the pipe (stdin).
;;; This fixes that problem, which only occurs in the CMU cores of this year.

(defvar *Fix-pipe-streams* T
  "Set to Nil if you want them left alone.  And tell me you don't get stuck.")

(when (and *Fix-pipe-streams*
	   (lisp::synonym-stream-p *terminal-io*)
	   (eq (lisp::synonym-stream-symbol *terminal-io*)
  (setf *terminal-io* (make-two-way-stream system::*stdin* system::*stdout*))
  ;; *query-io* and *debug-io* are synonym streams to this, so this fixes
  ;; everything.

;;;% Debugger extensions

;;;%% Implementation of a :pop command for CMU CL debugger

;;; Normally, errors which occur while in the debugger are just ignored, unless
;;; the user issues the "flush" command, which toggles this behavior.
(setq debug:*flush-debug-errors* nil)  ;; allow multiple error levels.

;;; This implementation of "POP" simply looks for the first restart that says
;;; "Return to debug level n" or "Return to top level." and executes it.
(debug::def-debug-command "POP" #+:new-compiler ()
    ;; find the first "Return to ..." restart
    (if (not (boundp 'debug::*debug-restarts*))
	(error "You're not in the debugger; how can you call this!?")
	(labels ((find-return-to (restart-list num)
		 (let ((first
			 #'(lambda (restart)
			     (string= (funcall
				       (conditions::restart-report-function restart)
				      "Return to " :end1 10))
		   (cond ((zerop num) (car first))
			 ((cdr first) (find-return-to (cdr first) (1- num)))))))
	(let* ((level (debug::read-if-available 1))
	       (first-return-to (find-return-to 
				 debug::*debug-restarts* (1- level))))
	  (if (null first-return-to)
	      (format *debug-io* "pop: ~d is too far" level)
	      (debug::invoke-restart-interactively first-return-to)

;;;%% arglist/source-file utils.

(defun get-correct-fn-object (sym)
  "Deduce how to get the \"right\" function object and return it."
  (let ((fun (or (macro-function sym)
		 (and (fboundp sym) (symbol-function sym)))))
    (cond (fun
	   (when (and (= (lisp::get-type fun) #.vm:closure-header-type)
		      (not (eval:interpreted-function-p fun)))
	     (setq fun (lisp::%closure-function fun)))
	   (error "Unknown function ~a.  Check package." sym)

(export '(arglist source-file cmulisp-trace))

;;;%% arglist - return arglist of function

(defun arglist (symbol package)
   (let* ((x (ilisp-find-symbol symbol package))
	  (fun (get-correct-fn-object x)))
      (cond ((eval:interpreted-function-p fun) 
	     (eval:interpreted-function-arglist fun))
	    ((= (lisp::get-type fun)
	     ;; generic function / method
	     (pcl::generic-function-pretty-arglist fun))
	    ((compiled-function-p fun)
	     (let ((string-or-nil
		    (#+CMU17 lisp::%function-arglist
		     #-CMU17 lisp::%function-header-arglist
	       (if string-or-nil
		   (read-from-string string-or-nil)
		   "No argument info.")))
	    (t (error "Unknown type of function")))))))

;;; source-file symbol package type --
;;; New version provided by Richard Harris <> with
;;; suggestions by Larry Hunter <>.

(defun source-file (symbol package type)
  (declare (ignore type))
   (let* ((x (ilisp-find-symbol symbol package))
	  (fun (get-correct-fn-object x)))
     (when (and fun (not (eval:interpreted-function-p fun)))
	   ;; The hack above is necessary because CMUCL does not
	   ;; correctly record source file information when 'loading'
	   ;; a non compiled file.
	   ;; In this case we fall back on the TAGS machinery.
	   ;; (At least as I underestand the code).
	   ;; Marco Antoniotti 11/22/94.
	   (cond (#+CMU17 (pcl::generic-function-p fun)
			  (= (lisp::get-type fun)
			  (dolist (method (pcl::generic-function-methods fun))
				   (or #+CMU17
				       (pcl::method-fast-function method)
				       (pcl::method-function method))))
		 (t (print-simple-source-info fun)))))))

;;; Old version. Left here for the time being.
;(defun source-file (symbol package type)
;  (declare (ignore type))
;  (ilisp-errors
;   (let* ((x (ilisp-find-symbol symbol package))
;	  (fun (get-correct-fn-object x)))
;     (when fun
;       (cond ((= (lisp::get-type fun)
;		 #.vm:funcallable-instance-header-type)
;	      ;; A PCL method! Uh boy!
;	      (dolist (method (pcl::generic-function-methods fun))
;		(print-simple-source-info
;		 (lisp::%closure-function (pcl::method-function method))))
;	      t)
;	     (t (print-simple-source-info fun)))))))

;;; Patch suggested by Richard Harris <>

;;; FUN-DEFINED-FROM-PATHNAME takes a symbol or function object.  It
;;; returns a pathname for the file the function was defined in.  If it was
;;; not defined in some file, then nil is returned.
;;; FUN-DEFINED-FROM-PATHNAME is from hemlock/rompsite.lisp (cmucl17f), 
;;; with added read-time conditionalization to work in older versions
;;; of cmucl.  It may need a little bit more conditionalization for
;;; some older versions of cmucl.

(defun fun-defined-from-pathname (function)
  "Returns the file where FUNCTION is defined in (if the file can be found).
Takes a symbol or function and returns the pathname for the file the
function was defined in.  If it was not defined in some file, nil is
  (flet ((frob (code)
	       (let ((info #+CMU17 (kernel:%code-debug-info code)
			   #-CMU17 (kernel:code-debug-info code)))
		 (when info
		       (let ((sources (c::debug-info-source info)))
			 (when sources
			       (let ((source (car sources)))
				 (when (eq (c::debug-source-from source) :file)
				       (c::debug-source-name source)))))))))
	(typecase function
		  (symbol (fun-defined-from-pathname (fdefinition function)))
		    (kernel:byte-closure-function function)))
		   (frob (c::byte-function-component function)))
		   (frob (kernel:function-code-header
			  (kernel:%function-self function))))
		  (t nil))))

;;; print-simple-source-info --
;;; Patches suggested by Larry Hunter <> and
;;; Richard Harris <>
;;; Nov 21, 1994.

(defun print-simple-source-info (fun)
  (let ((path (fun-defined-from-pathname fun)))
    (when (and path (probe-file path))
      (print (namestring (truename path)))

;;; Old version (semi patched). Left here for the time being.
;(defun print-simple-source-info (fun)
;  (let ((info (#+CMU17
;	       kernel:%code-debug-info
;	       #-CMU17
;	       kernel:code-debug-info       
;	       (kernel:function-code-header fun))))
;    (when info
;	  (let ((sources (c::compiled-debug-info-source info)))
;	    (when sources
;		  (dolist (source sources)
;			  (let ((name (c::debug-source-name source)))
;			    (when (eq (c::debug-source-from source) :file)
;				  ;; Patch suggested by
;				  ;; (Larry
;				  ;; Hunter) 
;				  ;; (print (namestring name)) ; old
;				  (print (truename name))
;				  )))
;		  t)))))

(defun cmulisp-trace (symbol package breakp)
  "Trace SYMBOL in PACKAGE."
   (let ((real-symbol (ilisp-find-symbol symbol package)))
     (setq breakp (read-from-string breakp))
     (when real-symbol (eval `(trace ,real-symbol :break ,breakp))))))