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Revision 1.25 - (hide annotations)
Sun Dec 15 10:21:38 1991 UTC (22 years, 4 months ago) by wlott
Branch: MAIN
Changes since 1.24: +77 -32 lines
Wrote SCRUB-CONTROL-STACK which zeros the unused non-zero portion of the
control stack, and added a call to it in %TOP-LEVEL.
1 ram 1.1 ;;; -*- Mode: Lisp; Package: Lisp; Log: code.log -*-
2     ;;;
3     ;;; **********************************************************************
4 ram 1.20 ;;; 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 wlott 1.25 "$Header: /tiger/var/lib/cvsroots/cmucl/src/code/lispinit.lisp,v 1.25 1991/12/15 10:21:38 wlott Exp $")
11 ram 1.20 ;;;
12 ram 1.1 ;;; **********************************************************************
13 wlott 1.10 ;;;
14 wlott 1.14 ;;; Initialization stuff for CMU Common Lisp, plus some other random functions
15     ;;; that we don't have any better place for.
16     ;;;
17 ram 1.1 ;;; 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 ram 1.4 (in-package "SYSTEM" :nicknames '("SYS"))
26 ram 1.1 (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 ram 1.8 *task-self* *task-data* *task-notify* with-interrupts
37     with-enabled-interrupts enable-interrupt ignore-interrupt
38 wlott 1.25 default-interrupt scrub-control-stack))
39 ram 1.1
40     (in-package "EXTENSIONS")
41 wlott 1.10 (export '(quit *prompt* save-lisp gc-on gc-off *clx-server-displays*))
42 ram 1.1
43     (in-package "LISP")
44    
45     ;;; Make the error system enable interrupts.
46    
47 wlott 1.10 (defconstant most-positive-fixnum #.vm:target-most-positive-fixnum
48 ram 1.1 "The fixnum closest in value to positive infinity.")
49    
50 wlott 1.10 (defconstant most-negative-fixnum #.vm:target-most-negative-fixnum
51 ram 1.1 "The fixnum closest in value to negative infinity.")
52    
53    
54     ;;; Random information:
55    
56 wlott 1.10 (defvar *lisp-implementation-version* "4.0(?)")
57 ram 1.1
58 wlott 1.10 (defvar *in-the-compiler* nil
59 ram 1.1 "Bound to T while running code inside the compiler. Macros may test this to
60     see where they are being expanded.")
61    
62    
63 ram 1.5 ;;; Must be initialized in %INITIAL-FUNCTION before the DEFVAR runs...
64     (proclaim '(special *gc-inhibit* *already-maybe-gcing*
65 ram 1.6 *need-to-collect-garbage* *gc-verbose*
66 ram 1.7 *before-gc-hooks* *after-gc-hooks*
67 wlott 1.12 mach::*interrupts-enabled*
68     mach::*interrupt-pending*
69 ram 1.7 c::*type-system-initialized*))
70 ram 1.1
71    
72 wlott 1.10 ;;;; Random magic specials.
73 ram 1.1
74    
75 wlott 1.10 ;;; These are filled in by Genesis.
76 ram 1.1
77 wlott 1.10 (defvar *current-catch-block*)
78     (defvar *current-unwind-block*)
79     (defvar *free-interrupt-context-index*)
80 ram 1.1
81    
82 wlott 1.10
83     ;;;; Global ports:
84    
85 wlott 1.16 (defvar *task-self* nil
86 wlott 1.10 "Port that refers to the current task.")
87 ram 1.1
88 wlott 1.16 (defvar *task-data* nil
89 wlott 1.10 "Port used to receive data for the current task.")
90 ram 1.1
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 wlott 1.10
99     #| More stuff that will probably be drastically different.
100    
101 ram 1.1 ;;; 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 wlott 1.12 (setf *reply-port-pointer* 0 *reply-port-depth* 0)
123 ram 1.1 (fill (the simple-vector *reply-port-stack*) nil)
124 wlott 1.12 (setf *allocate-reply-port* (mach:mach-task_data)))
125 ram 1.1 (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 wlott 1.12 (setf stack new *reply-port-stack* new)))
141 ram 1.1 (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 wlott 1.10 |#
174 ram 1.1
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 ram 1.5 ;;; Default-Default-Handler -- Internal
224     ;;;
225     ;;; If no such operation defined, signal an error.
226     ;;;
227     (defun default-default-handler (object)
228 wlott 1.11 #+nil
229 ram 1.5 (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 wlott 1.11 *port-table*))))
234     (error "You lose, object: ~S" object))
235 ram 1.1
236 ram 1.5
237 ram 1.1 ;;; 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 wlott 1.10
313    
314 ram 1.1
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 wlott 1.10 #| still more noise that will be different.
325    
326 ram 1.1 (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 wlott 1.10 |#
462    
463    
464 ram 1.1
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    
475     (eval-when (compile)
476     (defmacro print-and-call (name)
477     `(progn
478 wlott 1.10 (%primitive print ,(symbol-name name))
479 ram 1.1 (,name))))
480    
481 wlott 1.16 (def-c-variable "internal_errors_enabled" boolean)
482    
483 ram 1.1 (defun %initial-function ()
484     "Gives the world a shove and hopes it spins."
485 wlott 1.12 (setf *already-maybe-gcing* t)
486 ram 1.2 (setf *gc-inhibit* t)
487 ram 1.1 (setf *need-to-collect-garbage* nil)
488 wlott 1.12 (setf *gc-verbose* t)
489     (setf *before-gc-hooks* nil)
490     (setf *after-gc-hooks* nil)
491     (setf mach::*interrupts-enabled* t)
492     (setf mach::*interrupt-pending* nil)
493     (setf c::*type-system-initialized* nil)
494 ram 1.1 (%primitive print "In initial-function, and running.")
495    
496     ;; Many top-level forms call INFO, (SETF INFO).
497     (print-and-call c::globaldb-init)
498    
499     ;; Some of the random top-level forms call Make-Array, which calls Subtypep...
500 wlott 1.10 (print-and-call type-init)
501 ram 1.1
502 wlott 1.12 (setf *lisp-initialization-functions*
503 ram 1.1 (nreverse *lisp-initialization-functions*))
504     (%primitive print "Calling top-level forms.")
505     (dolist (fun *lisp-initialization-functions*)
506     (funcall fun))
507     (makunbound '*lisp-initialization-functions*) ; So it gets GC'ed.
508    
509 wlott 1.10 ;; Only do this after top level forms have run, 'cause thats where
510     ;; deftypes are.
511 wlott 1.12 (setf c::*type-system-initialized* t)
512 wlott 1.10
513 ram 1.1 (print-and-call os-init)
514     (print-and-call filesys-init)
515     (print-and-call conditions::error-init)
516    
517     (print-and-call reader-init)
518     (print-and-call backq-init)
519     (print-and-call sharp-init)
520     ;; After the various reader subsystems have done their thing to the standard
521     ;; readtable, copy it to *readtable*.
522 wlott 1.12 (setf *readtable* (copy-readtable std-lisp-readtable))
523 ram 1.1
524     (print-and-call stream-init)
525 wlott 1.10 (print-and-call loader-init)
526 ram 1.1 (print-and-call package-init)
527 wlott 1.16 (print-and-call kernel::signal-init)
528     (setf (alien-access (alien-value internal_errors_enabled)) t)
529 ram 1.17 (set-floating-point-modes :traps '(:overflow :underflow :invalid
530     :divide-by-zero))
531 ram 1.1
532 wlott 1.10 (%primitive print "Done initializing.")
533    
534 wlott 1.12 (setf *already-maybe-gcing* nil)
535 ram 1.1 (terpri)
536     (princ "CMU Common Lisp kernel core image ")
537     (princ (lisp-implementation-version))
538     (princ ".")
539     (terpri)
540     (princ "[You are in the LISP package.]")
541     (terpri)
542     (catch '%end-of-the-world
543     (loop
544     (%top-level)
545     (write-line "You're certainly a clever child.")))
546     (mach:unix-exit 0))
547    
548    
549     ;;;; Initialization functions:
550    
551     ;;; Reinit is called to reinitialize the world when a saved core image
552     ;;; is resumed.
553     (defvar *task-notify* NIL)
554    
555     (defun reinit ()
556     (without-interrupts
557 wlott 1.12 (setf *already-maybe-gcing* t)
558 wlott 1.14 (os-init)
559 wlott 1.16 (stream-reinit)
560 wlott 1.14 (kernel::signal-init)
561 wlott 1.16 (setf (alien-access (alien-value internal_errors_enabled)) t)
562 wlott 1.12 (setf *already-maybe-gcing* nil))
563 ram 1.18 (set-floating-point-modes :traps '(:overflow :underflow :invalid
564     :divide-by-zero))
565 wlott 1.10 #+nil
566 ram 1.1 (mach:port_enable (mach:mach-task_self) *task-notify*)
567 wlott 1.10 #+nil
568     (add-port-object *task-notify* nil *kernel-messages*))
569 ram 1.1
570     ;;; OS-Init initializes our operating-system interface. It sets the values
571     ;;; of the global port variables to what they should be and calls the functions
572     ;;; that set up the argument blocks for the server interfaces.
573    
574     (defun os-init ()
575 wlott 1.12 (setf *task-self* (mach:mach-task_self))
576     (setf *task-data* (mach:mach-task_data))
577     (setf *task-notify* (mach:mach-task_notify)))
578 ram 1.1
579    
580     ;;;; Miscellaneous external functions:
581    
582     ;;; Quit gets us out, one way or another.
583    
584     (defun quit (&optional recklessly-p)
585     "Terminates the current Lisp. Things are cleaned up unless Recklessly-P is
586     non-Nil."
587     (if recklessly-p
588     (mach:unix-exit 0)
589     (throw '%end-of-the-world nil)))
590    
591    
592     (defun sleep (n)
593     "This function causes execution to be suspended for N seconds. N may
594     be any non-negative, non-complex number."
595 wlott 1.13 (when (or (not (realp n))
596     (minusp n))
597     (error "Invalid argument to SLEEP: ~S.~%~
598     Must be a non-negative, non-complex number."
599     n))
600     (multiple-value-bind (sec usec)
601     (if (integerp n)
602     (values n 0)
603     (values (truncate n)
604     (truncate (* n 1000000))))
605     (mach:unix-select 0 0 0 0 sec usec))
606 ram 1.1 nil)
607    
608    
609 wlott 1.25 ;;;; SCRUB-CONTROL-STACK
610    
611    
612     (defconstant words-per-scrub-unit 512)
613    
614     (defun scrub-control-stack ()
615     "Zero the unused portion of the control stack so that old objects are not
616     kept alive because of uninitialized stack variables."
617     (declare (optimize (speed 3) (safety 0))
618     (values (unsigned-byte 20)))
619     (labels
620     ((scrub (ptr offset count)
621     (declare (type system-area-pointer ptr)
622     (type (unsigned-byte 16) offset)
623     (type (unsigned-byte 20) count)
624     (values (unsigned-byte 20)))
625     (cond ((= offset words-per-scrub-unit)
626     (look (sap+ ptr (* words-per-scrub-unit vm:word-bytes))
627     0
628     count))
629     (t
630     (setf (sap-ref-32 ptr offset) 0)
631     (scrub ptr (1+ offset) count))))
632     (look (ptr offset count)
633     (declare (type system-area-pointer ptr)
634     (type (unsigned-byte 16) offset)
635     (type (unsigned-byte 20) count)
636     (values (unsigned-byte 20)))
637     (cond ((= offset words-per-scrub-unit)
638     count)
639     ((zerop (sap-ref-32 ptr offset))
640     (look ptr (1+ offset) count))
641     (t
642     (scrub ptr offset (1+ count))))))
643     (let* ((csp (sap-int (c::control-stack-pointer-sap)))
644     (initial-offset
645     (logand csp (1- (* words-per-scrub-unit vm:word-bytes)))))
646     (declare (type (unsigned-byte 32) csp))
647     (scrub (int-sap (- csp initial-offset))
648     (floor initial-offset vm:word-bytes)
649     0))))
650    
651    
652    
653 ram 1.1 ;;;; TOP-LEVEL loop.
654    
655     (defvar / nil
656     "Holds a list of all the values returned by the most recent top-level EVAL.")
657     (defvar // nil "Gets the previous value of / when a new value is computed.")
658     (defvar /// nil "Gets the previous value of // when a new value is computed.")
659     (defvar * nil "Holds the value of the most recent top-level EVAL.")
660     (defvar ** nil "Gets the previous value of * when a new value is computed.")
661     (defvar *** nil "Gets the previous value of ** when a new value is computed.")
662     (defvar + nil "Holds the value of the most recent top-level READ.")
663     (defvar ++ nil "Gets the previous value of + when a new value is read.")
664     (defvar +++ nil "Gets the previous value of ++ when a new value is read.")
665     (defvar - nil "Holds the form curently being evaluated.")
666 ram 1.3 (defvar *prompt* "* "
667     "The top-level prompt string. This also may be a function of no arguments
668     that returns a simple-string.")
669 ram 1.1 (defvar *in-top-level-catcher* nil
670     "True if we are within the Top-Level-Catcher. This is used by interrupt
671     handlers to see whether it is o.k. to throw.")
672    
673 ram 1.3 (defun interactive-eval (form)
674     "Evaluate FORM, returning whatever it returns but adjust ***, **, *, +++, ++,
675     +, ///, //, /, and -."
676 ram 1.21 (setf - form)
677 ram 1.3 (let ((results (multiple-value-list (eval form))))
678     (setf /// //
679     // /
680     / results
681     *** **
682     ** *
683     * (car results)))
684 ram 1.21 (setf +++ ++
685     ++ +
686     + -)
687 ram 1.3 (unless (boundp '*)
688     ;; The bogon returned an unbound marker.
689     (setf * nil)
690     (cerror "Go on with * set to NIL."
691     "EVAL returned an unbound marker."))
692     (values-list /))
693 ram 1.21
694 ram 1.3
695     (defconstant eofs-before-quit 10)
696    
697 ram 1.1 (defun %top-level ()
698     "Top-level READ-EVAL-PRINT loop. Do not call this."
699 ram 1.3 (let ((* nil) (** nil) (*** nil)
700 ram 1.1 (- nil) (+ nil) (++ nil) (+++ nil)
701 ram 1.3 (/// nil) (// nil) (/ nil)
702     (magic-eof-cookie (cons :eof nil))
703     (number-of-eofs 0))
704 ram 1.1 (loop
705 wlott 1.25 (with-simple-restart (abort "Return to Top-Level.")
706     (catch 'top-level-catcher
707     (mach:unix-sigsetmask 0)
708     (let ((*in-top-level-catcher* t))
709     (loop
710     (scrub-control-stack)
711     (fresh-line)
712     (princ (if (functionp *prompt*)
713     (funcall *prompt*)
714     *prompt*))
715     (force-output)
716     (let ((form (read *standard-input* nil magic-eof-cookie)))
717     (cond ((not (eq form magic-eof-cookie))
718     (let ((results
719     (multiple-value-list (interactive-eval form))))
720     (dolist (result results)
721     (fresh-line)
722     (prin1 result)))
723     (setf number-of-eofs 0))
724     ((eql (incf number-of-eofs) 1)
725     (let ((stream (make-synonym-stream '*terminal-io*)))
726     (setf *standard-input* stream)
727     (setf *standard-output* stream)
728     (format t "~&Received EOF on *standard-input*, ~
729     switching to *terminal-io*.~%")))
730     ((> number-of-eofs eofs-before-quit)
731     (format t "~&Received more than ~D EOFs; Aborting.~%"
732     eofs-before-quit)
733     (quit))
734     (t
735     (format t "~&Received EOF.~%")))))))))))
736 ram 1.1
737    
738 ram 1.3
739 ram 1.1 ;;; %Halt -- Interface
740     ;;;
741     ;;; A convenient way to get into the assembly level debugger.
742     ;;;
743     (defun %halt ()
744     (%primitive halt))

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