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Revision 1.26 - (show annotations)
Mon Dec 16 18:47:09 1991 UTC (22 years, 4 months ago) by wlott
Branch: MAIN
Changes since 1.25: +27 -7 lines
Added noise to support load-time-value and make-load-form in the kernel
core.
1 ;;; -*- Mode: Lisp; Package: Lisp; Log: code.log -*-
2 ;;;
3 ;;; **********************************************************************
4 ;;; This code was written as part of the CMU Common Lisp project at
5 ;;; Carnegie Mellon University, and has been placed in the public domain.
6 ;;; If you want to use this code or any part of CMU Common Lisp, please contact
7 ;;; Scott Fahlman or slisp-group@cs.cmu.edu.
8 ;;;
9 (ext:file-comment
10 "$Header: /tiger/var/lib/cvsroots/cmucl/src/code/lispinit.lisp,v 1.26 1991/12/16 18:47:09 wlott Exp $")
11 ;;;
12 ;;; **********************************************************************
13 ;;;
14 ;;; Initialization stuff for CMU Common Lisp, plus some other random functions
15 ;;; that we don't have any better place for.
16 ;;;
17 ;;; Written by Skef Wholey and Rob MacLachlan.
18 ;;;
19 (in-package "LISP" :use '("SYSTEM" "DEBUG"))
20
21 (export '(most-positive-fixnum most-negative-fixnum sleep
22 ++ +++ ** *** // ///))
23
24
25 (in-package "SYSTEM" :nicknames '("SYS"))
26 (export '(add-port-death-handler remove-port-death-handler sap-int
27 int-sap sap-ref-8 sap-ref-16 sap-ref-32 without-gcing
28 *in-the-compiler* compiler-version *pornography-of-death*
29 *port-receive-rights-handlers* *port-ownership-rights-handlers*
30 without-interrupts with-reply-port map-port add-port-object
31 remove-port-object make-object-set object-set-operation
32 server-message *xwindow-table* map-xwindow add-xwindow-object
33 remove-xwindow-object server-event coerce-to-key-event
34 coerce-to-motion-event coerce-to-expose-event
35 coerece-to-exposecopy-event coerce-to-focuschange-event server
36 *task-self* *task-data* *task-notify* with-interrupts
37 with-enabled-interrupts enable-interrupt ignore-interrupt
38 default-interrupt scrub-control-stack))
39
40 (in-package "EXTENSIONS")
41 (export '(quit *prompt* save-lisp gc-on gc-off *clx-server-displays*))
42
43 (in-package "LISP")
44
45 ;;; Make the error system enable interrupts.
46
47 (defconstant most-positive-fixnum #.vm:target-most-positive-fixnum
48 "The fixnum closest in value to positive infinity.")
49
50 (defconstant most-negative-fixnum #.vm:target-most-negative-fixnum
51 "The fixnum closest in value to negative infinity.")
52
53
54 ;;; Random information:
55
56 (defvar *lisp-implementation-version* "4.0(?)")
57
58 (defvar *in-the-compiler* nil
59 "Bound to T while running code inside the compiler. Macros may test this to
60 see where they are being expanded.")
61
62
63 ;;; Must be initialized in %INITIAL-FUNCTION before the DEFVAR runs...
64 (proclaim '(special *gc-inhibit* *already-maybe-gcing*
65 *need-to-collect-garbage* *gc-verbose*
66 *before-gc-hooks* *after-gc-hooks*
67 mach::*interrupts-enabled*
68 mach::*interrupt-pending*
69 c::*type-system-initialized*))
70
71
72 ;;;; Random magic specials.
73
74
75 ;;; These are filled in by Genesis.
76
77 (defvar *current-catch-block*)
78 (defvar *current-unwind-block*)
79 (defvar *free-interrupt-context-index*)
80
81
82
83 ;;;; Global ports:
84
85 (defvar *task-self* nil
86 "Port that refers to the current task.")
87
88 (defvar *task-data* nil
89 "Port used to receive data for the current task.")
90
91
92
93 ;;;; Reply port allocation.
94 ;;;
95 ;;; We maintain a global stack of reply ports which is shared among
96 ;;; all matchmaker interfaces, and could be used by other people as well.
97 ;;;
98
99 #| More stuff that will probably be drastically different.
100
101 ;;; The stack is represented by a vector, and a pointer to the first
102 ;;; free port. The stack grows upward. There is always at least one
103 ;;; NIL entry in the stack after the last allocated port.
104 ;;;
105 (defvar *reply-port-stack* (make-array 16)) ; Vector of reply ports.
106 (defvar *reply-port-pointer* 0) ; Index of first free port.
107 (defvar *reply-port-depth* 0) ; Dynamic depth in With-Reply-Port forms.
108
109 ;;; We use this as the reply port when allocating or deallocating reply
110 ;;; ports to get around potentially nasty interactions. Interrupts
111 ;;; are always off when we are doing this, so we don't have to have
112 ;;; more than one of these, or worry about unwinding.
113 (defvar *allocate-reply-port* (mach:mach-task_data))
114
115 ;;; Reset-Reply-Port-Stack -- Internal
116 ;;;
117 ;;; This is a before-save initialization which Nil's out the reply
118 ;;; port stack and sets *allocate-reply-port* back to DataPort so that
119 ;;; things initialize right at OS-Init time.
120 ;;;
121 (defun reset-reply-port-stack ()
122 (setf *reply-port-pointer* 0 *reply-port-depth* 0)
123 (fill (the simple-vector *reply-port-stack*) nil)
124 (setf *allocate-reply-port* (mach:mach-task_data)))
125 (pushnew 'reset-reply-port-stack *before-save-initializations*)
126
127 ;;; Allocate-New-Reply-Ports -- Internal
128 ;;;
129 ;;; If we run out of reply ports, we allocate another one, possibly
130 ;;; growing the stack.
131 ;;;
132 (defun allocate-new-reply-ports ()
133 (let* ((stack *reply-port-stack*)
134 (pointer *reply-port-pointer*)
135 (len (length stack)))
136 (declare (simple-vector stack) (fixnum len))
137 (when (eql pointer (1- len))
138 (let ((new (make-array (* len 2))))
139 (replace new stack :end1 len :end2 len)
140 (setf stack new *reply-port-stack* new)))
141 (setf (svref stack pointer) *allocate-reply-port*)
142 (let ((port (gr-call* mach:port_allocate (mach:mach-task_self))))
143 (gr-call mach:port_disable (mach:mach-task_self) port)
144 ;;
145 ;; Nil out the allocate reply port so it isn't used for mundane purposes.
146 (setf (svref stack pointer) nil)
147 (setf (svref stack (1- pointer)) port)
148 port)))
149
150 ;;; Reallocate-Reply-Ports -- Internal
151 ;;;
152 ;;; This function is called when With-Reply-Port finds the stack pointer
153 ;;; to be other than what it expected when it finishes. Reallocates all
154 ;;; of the ports on the stack from Start to *reply-port-pointer*. We
155 ;;; stick the *allocate-reply-port* out at *reply-port-pointer*, and
156 ;;; bind *reply-port-depth*, so that the allocation functions are happy.
157 ;;;
158 (defun reallocate-reply-ports (start)
159 (let* ((pointer *reply-port-pointer*)
160 (*reply-port-depth* pointer)
161 (stack *reply-port-stack*)
162 (save-port (svref stack pointer)))
163 (when (> start pointer)
164 (error "More ports in use than allocated???"))
165 (setf (svref stack pointer) *allocate-reply-port*)
166 (do ((i start (1+ i)))
167 ((= i pointer)
168 (setf (svref stack pointer) save-port))
169 (let ((port (svref stack i)))
170 (gr-call mach:port_deallocate *task-self* port)
171 (setf (svref stack i)
172 (gr-call* mach:port_allocate *task-self*))))))
173 |#
174
175
176 ;;;; Server stuff:
177 ;;;
178 ;;; There is a fair amount of stuff to support Matchmaker RPC servers
179 ;;; and asynchonous message service. RPC message service needs to be
180 ;;; centralized since a server must receive on all ports, and there is
181 ;;; no way for a particular server to know about all other servers
182 ;;; in the same lisp.
183 ;;;
184 ;;; The idea is that you receive the message, and then dispatch off
185 ;;; of the port received on and the message ID received. Ports correspond
186 ;;; to objects that the server manages. Message ID's correspond to the
187 ;;; operations on the objects. Objects are grouped into object sets, which
188 ;;; are sets of objects having the same operations defined.
189 ;;;
190 ;;; The same mechanism is used for handling asynchronous messages.
191 ;;;
192
193 ;;; The current implementation uses standard eq[l] hashtables for both
194 ;;; levels of dispatching. Special purpose data structures would be more
195 ;;; efficient, but the ~1ms overhead will probably be lost in the noise.
196
197 ;;;
198 ;;; Hashtable from ports to objects. Each entry is a cons (object . set).
199 ;;;
200 (defvar *port-table* (make-hash-table :test #'eql))
201
202 ;;; Hashtable from windows to objects. Each entry is a cons (object . set).
203 ;;;
204 (defvar *xwindow-table* (make-hash-table :test #'eql))
205
206
207 (defstruct (object-set
208 (:constructor make-object-set
209 (name &optional
210 (default-handler #'default-default-handler)))
211 (:print-function
212 (lambda (s stream d)
213 (declare (ignore d))
214 (format stream "#<Object Set ~S>" (object-set-name s)))))
215 name ; Name, for descriptive purposes.
216 (table (make-hash-table :test #'eq)) ; Message-ID or xevent-type --> handler fun.
217 default-handler)
218
219 (setf (documentation 'make-object-set 'function)
220 "Make an object set for use by a RPC/xevent server. Name is for
221 descriptive purposes only.")
222
223 ;;; Default-Default-Handler -- Internal
224 ;;;
225 ;;; If no such operation defined, signal an error.
226 ;;;
227 (defun default-default-handler (object)
228 #+nil
229 (alien-bind ((msg (server-message-msg server-message)))
230 (error "No operation for ID ~D on ~S in ~S."
231 (alien-access (mach:msg-id (alien-value msg))) object
232 (car (gethash (alien-access (mach:msg-localport (alien-value msg)))
233 *port-table*))))
234 (error "You lose, object: ~S" object))
235
236
237 ;;; MAP-XWINDOW and MAP-PORT return as multiple values the object and
238 ;;; object set mapped to by a xwindow or port in *xwindow-table* or
239 ;;; *port-table*.
240 ;;;
241 (macrolet ((defmapper (name table)
242 `(defun ,(intern (concatenate 'simple-string
243 "MAP-" (symbol-name name)))
244 (,name)
245 ,(format nil "Return as multiple values the object and ~
246 object-set mapped to by ~A."
247 (string-downcase (symbol-name name)))
248 (let ((temp (gethash ,name ,table)))
249 (if temp
250 (values (car temp) (cdr temp))
251 (values nil nil))))))
252 (defmapper port *port-table*)
253 (defmapper xwindow *xwindow-table*))
254
255
256 ;;; ADD-PORT-OBJECT and ADD-XWINDOW-OBJECT store an object/object-set pair
257 ;;; mapped to by a port or xwindow in either *port-table* or *xwindow-table*.
258 ;;;
259 (macrolet ((def-add-object (name table)
260 `(defun ,(intern (concatenate 'simple-string
261 "ADD-" (symbol-name name)
262 "-OBJECT"))
263 (,name object object-set)
264 ,(format nil "Add a new ~A/object/object-set association."
265 (string-downcase (symbol-name name)))
266 (check-type object-set object-set)
267 (setf (gethash ,name ,table) (cons object object-set))
268 object)))
269 (def-add-object port *port-table*)
270 (def-add-object xwindow *xwindow-table*))
271
272
273 ;;; REMOVE-PORT-OBJECT and REMOVE-XWINDOW-OBJECT remove a port or xwindow and
274 ;;; its associated object/object-set pair from *port-table* or *xwindow-table*.
275 ;;;
276 (macrolet ((def-remove-object (name table)
277 `(defun ,(intern (concatenate 'simple-string
278 "REMOVE-" (symbol-name name)
279 "-OBJECT"))
280 (,name)
281 ,(format nil
282 "Remove ~A and its associated object/object-set pair."
283 (string-downcase (symbol-name name)))
284 (remhash ,name ,table))))
285 (def-remove-object port *port-table*)
286 (def-remove-object xwindow *xwindow-table*))
287
288
289 ;;; Object-Set-Operation -- Public
290 ;;;
291 ;;; Look up the handler function for a given message ID.
292 ;;;
293 (defun object-set-operation (object-set message-id)
294 "Return the handler function in Object-Set for the operation specified by
295 Message-ID, if none, NIL is returned. The handler function is passed
296 the object. The received message is in server-Message."
297 (check-type object-set object-set)
298 (check-type message-id fixnum)
299 (values (gethash message-id (object-set-table object-set))))
300
301 ;;; %Set-Object-Set-Operation -- Internal
302 ;;;
303 ;;; The setf inverse for Object-Set-Operation.
304 ;;;
305 (defun %set-object-set-operation (object-set message-id new-value)
306 (check-type object-set object-set)
307 (check-type message-id fixnum)
308 (setf (gethash message-id (object-set-table object-set)) new-value))
309 ;;;
310 (defsetf object-set-operation %set-object-set-operation
311 "Sets the handler function for an object set operation.")
312
313
314
315 ;;;; Emergency Message Handling:
316 ;;;
317 ;;; We use the same mechanism for asynchronous messages as is used for
318 ;;; normal server messages. The only tricky part is that we don't want
319 ;;; some random server function being called when we really want to
320 ;;; receive an emergency message, so we can't receive on all ports.
321 ;;; Instead, we use MessagesWaiting to find the ports with emergency
322 ;;; messages.
323
324 #| still more noise that will be different.
325
326 (defalien waiting-ports nil (long-words 128))
327
328 ;;; Service-Emergency-Message-Interrupt -- Internal
329 ;;;
330 ;;; This is a lot like the server function, but we only receive on
331 ;;; ports with one emergency message. We only receive one message because
332 ;;; the handler function might have caused any other messages to be received.
333 ;;; When we re-enable interrupts, if any emergency messages are left, we
334 ;;; should be interrupted again.
335 ;;;
336 (defun service-emergency-message-interrupt ()
337 (grab-message-loop))
338
339 ;;;
340 ;;; This object set is used for DataPort, which is the port various magical
341 ;;; message from the kernel are received on...
342 (defvar *kernel-messages* (make-object-set "Kernel Messages"))
343
344 (compiler-let ((*alien-eval-when* '(compile eval)))
345 (defrecord port-death-msg
346 (msg mach:msg #.(record-size 'mach:msg))
347 (ex-port-tt pad (long-words 1))
348 (ex-port (signed-byte 32) (long-words 1)))
349
350 (defoperator (server-message-port-death-msg port-death-msg)
351 ((msg server-message))
352 `(alien-index (alien-value ,msg) 0 (record-size 'port-death-msg)))
353 ); Compiler-Let
354
355
356 ;;; *Port-Death-Handlers* is an EQ hash table of lists of functions that are
357 ;;; called upon port death. If a port dies that is not in the table, we print
358 ;;; out a message on *Trace-Output* describing its death. If
359 ;;; *Pornography-Of-Death* is true, we don't even print that message.
360
361 (defvar *port-death-handlers* (make-hash-table :test #'eql)
362 "Don't use this --- use Add-Port-Death-Handler instead.")
363
364 ;;; Add-Port-Death-Handler, Remove-Port-Death-Handler -- Public
365 ;;;
366 (defun add-port-death-handler (port function)
367 "Make Function a handler for port death on Port. When the port dies,
368 Function is called with the port and an argument. See also
369 Remove-Port-Death-Handler."
370 (pushnew function (gethash port *port-death-handlers*))
371 nil)
372 ;;;
373 (defun remove-port-death-handler (port function)
374 "Undoes the effect of Add-Port-Death-Handler."
375 (setf (gethash port *port-death-handlers*)
376 (delete function (gethash port *port-death-handlers*)))
377 nil)
378
379 (setf (object-set-operation *kernel-messages* mach:notify-port-deleted)
380 #'(lambda (obj)
381 (declare (ignore obj))
382 (let* ((ex-port (alien-access
383 (port-death-msg-ex-port
384 (server-message-port-death-msg server-message))))
385 (handlers (gethash ex-port *port-death-handlers*)))
386 (remhash ex-port *port-table*)
387 (remhash ex-port *port-death-handlers*)
388 (if (null handlers)
389 (handle-unclaimed-port-death ex-port)
390 (dolist (fun handlers) (funcall fun ex-port))))
391 mach:kern-success))
392
393 (defvar *pornography-of-death* t
394 "If true, nothing is said about port deaths.")
395
396 (defun handle-unclaimed-port-death (port)
397 (unless *pornography-of-death*
398 (format *trace-output* "~&[Port ~S just bit the dust.]~%" port)))
399
400 ;;; Port receive and ownership rights messages are handled simlarly, but
401 ;;; by default we deallocate the port to make sure it's really dead. This
402 ;;; gets around problems with ports being exhausted because some servers
403 ;;; don't really nuke the port when the deallocate the object.
404 ;;;
405
406 (defvar *port-receive-rights-handlers* (make-hash-table :test #'eql)
407 "This is a hashtable from ports to functions. The function is called with
408 the port as its argument when a port receive rights message for that port
409 is received from the kernel.")
410
411 (defvar *port-ownership-rights-handlers* (make-hash-table :test #'eql)
412 "This is a hashtable from ports to functions. The function is called with
413 the port as its argument when a port ownership rights message for that port
414 is received from the kernel.")
415
416 (setf (object-set-operation *kernel-messages* mach:notify-receive-rights)
417 #'(lambda (obj)
418 (declare (ignore obj))
419 (let ((ex-port (alien-access
420 (port-death-msg-ex-port
421 (server-message-port-death-msg server-message)))))
422 (funcall (gethash ex-port *port-receive-rights-handlers*
423 #'handle-unclaimed-port-rights)
424 ex-port))
425 mach:kern-success))
426
427 (setf (object-set-operation *kernel-messages* mach:notify-ownership-rights)
428 #'(lambda (obj)
429 (declare (ignore obj))
430 (let ((ex-port (alien-access
431 (port-death-msg-ex-port
432 (server-message-port-death-msg server-message)))))
433 (funcall (gethash ex-port *port-ownership-rights-handlers*
434 #'handle-unclaimed-port-rights)
435 ex-port))
436 mach:kern-success))
437
438 (defun handle-unclaimed-port-rights (port)
439 (unless *pornography-of-death*
440 (format *trace-output* "~&[Rights received for port ~D, deallocating it.]~%"
441 port))
442 (mach:port_deallocate *task-self* port)
443 (remhash port *port-receive-rights-handlers*)
444 (remhash port *port-ownership-rights-handlers*)
445 (remhash port *port-table*))
446
447 (add-port-object *task-data* nil *kernel-messages*)
448
449 ;;; Clear-Port-Tables -- Internal
450 ;;;
451 ;;; A before-save initialization which clears all of the port hashtables.
452 ;;;
453 (defun clear-port-tables ()
454 (clrhash *port-table*)
455 (clrhash *port-death-handlers*)
456 (clrhash *port-receive-rights-handlers*)
457 (clrhash *port-ownership-rights-handlers*))
458
459 (pushnew 'clear-port-tables *before-save-initializations*)
460
461 |#
462
463
464
465 ;;; %Initial-Function is called when a cold system starts up. First we zoom
466 ;;; down the *Lisp-Initialization-Functions* doing things that wanted to happen
467 ;;; at "load time." Then we initialize the various subsystems and call the
468 ;;; read-eval-print loop. The top-level Read-Eval-Print loop is executed until
469 ;;; someone (most likely the Quit function) throws to the tag
470 ;;; %End-Of-The-World. We quit this way so that all outstanding cleanup forms
471 ;;; in Unwind-Protects will get executed.
472
473 (proclaim '(special *lisp-initialization-functions*
474 *load-time-values*))
475
476 (eval-when (compile)
477 (defmacro print-and-call (name)
478 `(progn
479 (%primitive print ,(symbol-name name))
480 (,name))))
481
482 (def-c-variable "internal_errors_enabled" boolean)
483
484 (defun %initial-function ()
485 "Gives the world a shove and hopes it spins."
486 (setf *already-maybe-gcing* t)
487 (setf *gc-inhibit* t)
488 (setf *need-to-collect-garbage* nil)
489 (setf *gc-verbose* t)
490 (setf *before-gc-hooks* nil)
491 (setf *after-gc-hooks* nil)
492 (setf mach::*interrupts-enabled* t)
493 (setf mach::*interrupt-pending* nil)
494 (setf c::*type-system-initialized* nil)
495 (%primitive print "In initial-function, and running.")
496
497 ;; Many top-level forms call INFO, (SETF INFO).
498 (print-and-call c::globaldb-init)
499
500 ;; Some of the random top-level forms call Make-Array, which calls Subtypep...
501 (print-and-call type-init)
502
503 (let ((funs (nreverse *lisp-initialization-functions*)))
504 (%primitive print "Calling top-level forms.")
505 (dolist (fun funs)
506 (typecase fun
507 (function
508 (funcall fun))
509 (cons
510 (case (car fun)
511 (:load-time-value
512 (setf (svref *load-time-values* (third fun))
513 (funcall (second fun))))
514 (:load-time-value-fixup
515 (setf (sap-ref-32 (second fun) 0)
516 (get-lisp-obj-address
517 (svref *load-time-values* (third fun)))))
518 (t
519 (%primitive print
520 "Bogus fixup in *lisp-initialization-functions*")
521 (%halt))))
522 (t
523 (%primitive print
524 "Bogus function in *lisp-initialization-functions*")
525 (%halt)))))
526 (makunbound '*lisp-initialization-functions*) ; So it gets GC'ed.
527 (makunbound '*load-time-values*)
528
529 ;; Only do this after top level forms have run, 'cause thats where
530 ;; deftypes are.
531 (setf c::*type-system-initialized* t)
532
533 (print-and-call os-init)
534 (print-and-call filesys-init)
535 (print-and-call conditions::error-init)
536
537 (print-and-call reader-init)
538 (print-and-call backq-init)
539 (print-and-call sharp-init)
540 ;; After the various reader subsystems have done their thing to the standard
541 ;; readtable, copy it to *readtable*.
542 (setf *readtable* (copy-readtable std-lisp-readtable))
543
544 (print-and-call stream-init)
545 (print-and-call loader-init)
546 (print-and-call package-init)
547 (print-and-call kernel::signal-init)
548 (setf (alien-access (alien-value internal_errors_enabled)) t)
549 (set-floating-point-modes :traps '(:overflow :underflow :invalid
550 :divide-by-zero))
551
552 (%primitive print "Done initializing.")
553
554 (setf *already-maybe-gcing* nil)
555 (terpri)
556 (princ "CMU Common Lisp kernel core image ")
557 (princ (lisp-implementation-version))
558 (princ ".")
559 (terpri)
560 (princ "[You are in the LISP package.]")
561 (terpri)
562 (catch '%end-of-the-world
563 (loop
564 (%top-level)
565 (write-line "You're certainly a clever child.")))
566 (mach:unix-exit 0))
567
568
569 ;;;; Initialization functions:
570
571 ;;; Reinit is called to reinitialize the world when a saved core image
572 ;;; is resumed.
573 (defvar *task-notify* NIL)
574
575 (defun reinit ()
576 (without-interrupts
577 (setf *already-maybe-gcing* t)
578 (os-init)
579 (stream-reinit)
580 (kernel::signal-init)
581 (setf (alien-access (alien-value internal_errors_enabled)) t)
582 (setf *already-maybe-gcing* nil))
583 (set-floating-point-modes :traps '(:overflow :underflow :invalid
584 :divide-by-zero))
585 #+nil
586 (mach:port_enable (mach:mach-task_self) *task-notify*)
587 #+nil
588 (add-port-object *task-notify* nil *kernel-messages*))
589
590 ;;; OS-Init initializes our operating-system interface. It sets the values
591 ;;; of the global port variables to what they should be and calls the functions
592 ;;; that set up the argument blocks for the server interfaces.
593
594 (defun os-init ()
595 (setf *task-self* (mach:mach-task_self))
596 (setf *task-data* (mach:mach-task_data))
597 (setf *task-notify* (mach:mach-task_notify)))
598
599
600 ;;;; Miscellaneous external functions:
601
602 ;;; Quit gets us out, one way or another.
603
604 (defun quit (&optional recklessly-p)
605 "Terminates the current Lisp. Things are cleaned up unless Recklessly-P is
606 non-Nil."
607 (if recklessly-p
608 (mach:unix-exit 0)
609 (throw '%end-of-the-world nil)))
610
611
612 (defun sleep (n)
613 "This function causes execution to be suspended for N seconds. N may
614 be any non-negative, non-complex number."
615 (when (or (not (realp n))
616 (minusp n))
617 (error "Invalid argument to SLEEP: ~S.~%~
618 Must be a non-negative, non-complex number."
619 n))
620 (multiple-value-bind (sec usec)
621 (if (integerp n)
622 (values n 0)
623 (values (truncate n)
624 (truncate (* n 1000000))))
625 (mach:unix-select 0 0 0 0 sec usec))
626 nil)
627
628
629 ;;;; SCRUB-CONTROL-STACK
630
631
632 (defconstant words-per-scrub-unit 512)
633
634 (defun scrub-control-stack ()
635 "Zero the unused portion of the control stack so that old objects are not
636 kept alive because of uninitialized stack variables."
637 (declare (optimize (speed 3) (safety 0))
638 (values (unsigned-byte 20)))
639 (labels
640 ((scrub (ptr offset count)
641 (declare (type system-area-pointer ptr)
642 (type (unsigned-byte 16) offset)
643 (type (unsigned-byte 20) count)
644 (values (unsigned-byte 20)))
645 (cond ((= offset words-per-scrub-unit)
646 (look (sap+ ptr (* words-per-scrub-unit vm:word-bytes))
647 0
648 count))
649 (t
650 (setf (sap-ref-32 ptr offset) 0)
651 (scrub ptr (1+ offset) count))))
652 (look (ptr offset count)
653 (declare (type system-area-pointer ptr)
654 (type (unsigned-byte 16) offset)
655 (type (unsigned-byte 20) count)
656 (values (unsigned-byte 20)))
657 (cond ((= offset words-per-scrub-unit)
658 count)
659 ((zerop (sap-ref-32 ptr offset))
660 (look ptr (1+ offset) count))
661 (t
662 (scrub ptr offset (1+ count))))))
663 (let* ((csp (sap-int (c::control-stack-pointer-sap)))
664 (initial-offset
665 (logand csp (1- (* words-per-scrub-unit vm:word-bytes)))))
666 (declare (type (unsigned-byte 32) csp))
667 (scrub (int-sap (- csp initial-offset))
668 (floor initial-offset vm:word-bytes)
669 0))))
670
671
672
673 ;;;; TOP-LEVEL loop.
674
675 (defvar / nil
676 "Holds a list of all the values returned by the most recent top-level EVAL.")
677 (defvar // nil "Gets the previous value of / when a new value is computed.")
678 (defvar /// nil "Gets the previous value of // when a new value is computed.")
679 (defvar * nil "Holds the value of the most recent top-level EVAL.")
680 (defvar ** nil "Gets the previous value of * when a new value is computed.")
681 (defvar *** nil "Gets the previous value of ** when a new value is computed.")
682 (defvar + nil "Holds the value of the most recent top-level READ.")
683 (defvar ++ nil "Gets the previous value of + when a new value is read.")
684 (defvar +++ nil "Gets the previous value of ++ when a new value is read.")
685 (defvar - nil "Holds the form curently being evaluated.")
686 (defvar *prompt* "* "
687 "The top-level prompt string. This also may be a function of no arguments
688 that returns a simple-string.")
689 (defvar *in-top-level-catcher* nil
690 "True if we are within the Top-Level-Catcher. This is used by interrupt
691 handlers to see whether it is o.k. to throw.")
692
693 (defun interactive-eval (form)
694 "Evaluate FORM, returning whatever it returns but adjust ***, **, *, +++, ++,
695 +, ///, //, /, and -."
696 (setf - form)
697 (let ((results (multiple-value-list (eval form))))
698 (setf /// //
699 // /
700 / results
701 *** **
702 ** *
703 * (car results)))
704 (setf +++ ++
705 ++ +
706 + -)
707 (unless (boundp '*)
708 ;; The bogon returned an unbound marker.
709 (setf * nil)
710 (cerror "Go on with * set to NIL."
711 "EVAL returned an unbound marker."))
712 (values-list /))
713
714
715 (defconstant eofs-before-quit 10)
716
717 (defun %top-level ()
718 "Top-level READ-EVAL-PRINT loop. Do not call this."
719 (let ((* nil) (** nil) (*** nil)
720 (- nil) (+ nil) (++ nil) (+++ nil)
721 (/// nil) (// nil) (/ nil)
722 (magic-eof-cookie (cons :eof nil))
723 (number-of-eofs 0))
724 (loop
725 (with-simple-restart (abort "Return to Top-Level.")
726 (catch 'top-level-catcher
727 (mach:unix-sigsetmask 0)
728 (let ((*in-top-level-catcher* t))
729 (loop
730 (scrub-control-stack)
731 (fresh-line)
732 (princ (if (functionp *prompt*)
733 (funcall *prompt*)
734 *prompt*))
735 (force-output)
736 (let ((form (read *standard-input* nil magic-eof-cookie)))
737 (cond ((not (eq form magic-eof-cookie))
738 (let ((results
739 (multiple-value-list (interactive-eval form))))
740 (dolist (result results)
741 (fresh-line)
742 (prin1 result)))
743 (setf number-of-eofs 0))
744 ((eql (incf number-of-eofs) 1)
745 (let ((stream (make-synonym-stream '*terminal-io*)))
746 (setf *standard-input* stream)
747 (setf *standard-output* stream)
748 (format t "~&Received EOF on *standard-input*, ~
749 switching to *terminal-io*.~%")))
750 ((> number-of-eofs eofs-before-quit)
751 (format t "~&Received more than ~D EOFs; Aborting.~%"
752 eofs-before-quit)
753 (quit))
754 (t
755 (format t "~&Received EOF.~%")))))))))))
756
757
758
759 ;;; %Halt -- Interface
760 ;;;
761 ;;; A convenient way to get into the assembly level debugger.
762 ;;;
763 (defun %halt ()
764 (%primitive halt))

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