1 ;;;; the VM definition of function call for the Alpha
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
14 ;;;; interfaces to IR2 conversion
16 ;;; Return a wired TN describing the N'th full call argument passing
18 (!def-vm-support-routine standard-arg-location (n)
19 (declare (type unsigned-byte n))
20 (if (< n register-arg-count)
21 (make-wired-tn *backend-t-primitive-type*
23 (elt *register-arg-offsets* n))
24 (make-wired-tn *backend-t-primitive-type*
25 control-stack-arg-scn n)))
28 ;;; Make a passing location TN for a local call return PC. If standard
29 ;;; is true, then use the standard (full call) location, otherwise use
30 ;;; any legal location. Even in the non-standard case, this may be
31 ;;; restricted by a desire to use a subroutine call instruction.
32 (!def-vm-support-routine make-return-pc-passing-location (standard)
34 (make-wired-tn *backend-t-primitive-type* register-arg-scn lra-offset)
35 (make-restricted-tn *backend-t-primitive-type* register-arg-scn)))
37 ;;; This is similar to MAKE-RETURN-PC-PASSING-LOCATION, but makes a
38 ;;; location to pass OLD-FP in. This is (obviously) wired in the
39 ;;; standard convention, but is totally unrestricted in non-standard
40 ;;; conventions, since we can always fetch it off of the stack using
42 (!def-vm-support-routine make-old-fp-passing-location (standard)
44 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn ocfp-offset)
45 (make-normal-tn *fixnum-primitive-type*)))
47 ;;; These functions make the TNs used to hold Old-FP and Return-PC
48 ;;; within the current function. We treat these specially so that the
49 ;;; debugger can find them at a known location.
50 (!def-vm-support-routine make-old-fp-save-location (env)
52 (physenv-debug-live-tn (make-normal-tn *fixnum-primitive-type*) env)
53 (make-wired-tn *fixnum-primitive-type*
56 (!def-vm-support-routine make-return-pc-save-location (env)
57 (let ((ptype *backend-t-primitive-type*))
59 (physenv-debug-live-tn (make-normal-tn ptype) env)
60 (make-wired-tn ptype control-stack-arg-scn lra-save-offset))))
62 ;;; Make a TN for the standard argument count passing location. We
63 ;;; only need to make the standard location, since a count is never
64 ;;; passed when we are using non-standard conventions.
65 (!def-vm-support-routine make-arg-count-location ()
66 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn nargs-offset))
69 ;;; Make a TN to hold the number-stack frame pointer. This is
70 ;;; allocated once per component, and is component-live.
71 (!def-vm-support-routine make-nfp-tn ()
73 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn nfp-offset)))
75 (!def-vm-support-routine make-stack-pointer-tn ()
76 (make-normal-tn *fixnum-primitive-type*))
78 (!def-vm-support-routine make-number-stack-pointer-tn ()
79 (make-normal-tn *fixnum-primitive-type*))
81 ;;; Return a list of TNs that can be used to represent an
82 ;;; unknown-values continuation within a function.
83 (!def-vm-support-routine make-unknown-values-locations ()
84 (list (make-stack-pointer-tn)
85 (make-normal-tn *fixnum-primitive-type*)))
88 ;;; This function is called by the ENTRY-ANALYZE phase, allowing
89 ;;; VM-dependent initialization of the IR2-COMPONENT structure. We
90 ;;; push placeholder entries in the CONSTANTS to leave room for
91 ;;; additional noise in the code object header.
92 (!def-vm-support-routine select-component-format (component)
93 (declare (type component component))
94 (dotimes (i code-constants-offset)
95 (vector-push-extend nil
96 (ir2-component-constants (component-info component))))
102 ;;; Return the number of bytes needed for the current non-descriptor
103 ;;; stack frame. Non-descriptor stack frames must be multiples of 8
104 ;;; bytes on the PMAX.
105 (defun bytes-needed-for-non-descriptor-stack-frame ()
106 (* (logandc2 (1+ (sb-allocated-size 'non-descriptor-stack)) 1)
109 ;;; This is used for setting up the Old-FP in local call.
110 (define-vop (current-fp)
111 (:results (val :scs (any-reg)))
115 ;;; This is used for computing the caller's NFP for use in
116 ;;; known-values return. It only works assuming there is no variable
117 ;;; size stuff on the nstack.
118 (define-vop (compute-old-nfp)
119 (:results (val :scs (any-reg)))
122 (let ((nfp (current-nfp-tn vop)))
124 (inst addq nfp (bytes-needed-for-non-descriptor-stack-frame) val)))))
126 (define-vop (xep-allocate-frame)
127 (:info start-lab copy-more-arg-follows)
128 (:ignore copy-more-arg-follows)
130 (:temporary (:scs (non-descriptor-reg)) temp)
132 ;; Make sure the function is aligned, and drop a label pointing to
133 ;; this function header.
134 (align n-lowtag-bits)
135 (trace-table-entry trace-table-fun-prologue)
136 (emit-label start-lab)
137 ;; Allocate function header.
138 (inst simple-fun-header-word)
139 (dotimes (i (1- simple-fun-code-offset))
141 ;; The start of the actual code.
142 ;; Compute CODE from the address of this entry point.
143 (let ((entry-point (gen-label)))
144 (emit-label entry-point)
145 (inst compute-code-from-fn code-tn lip-tn entry-point temp)
146 ;; ### We should also save it on the stack so that the garbage
147 ;; collector won't forget about us if we call anyone else.
149 ;; Build our stack frames.
152 (* n-word-bytes (sb-allocated-size 'control-stack))
154 (let ((nfp (current-nfp-tn vop)))
156 (inst subq nsp-tn (bytes-needed-for-non-descriptor-stack-frame)
159 (trace-table-entry trace-table-normal)))
161 (define-vop (allocate-frame)
162 (:results (res :scs (any-reg))
163 (nfp :scs (any-reg)))
166 (trace-table-entry trace-table-fun-prologue)
170 (* n-word-bytes (sb-allocated-size 'control-stack))
172 (when (ir2-physenv-number-stack-p callee)
173 (inst subq nsp-tn (bytes-needed-for-non-descriptor-stack-frame)
176 (trace-table-entry trace-table-normal)))
178 ;;; Allocate a partial frame for passing stack arguments in a full
179 ;;; call. NARGS is the number of arguments passed. If no stack
180 ;;; arguments are passed, then we don't have to do anything.
181 (define-vop (allocate-full-call-frame)
183 (:results (res :scs (any-reg)))
185 (when (> nargs register-arg-count)
187 (inst lda csp-tn (* nargs n-word-bytes) csp-tn))))
189 ;;; Emit code needed at the return-point from an unknown-values call
190 ;;; for a fixed number of values. Values is the head of the TN-REF
191 ;;; list for the locations that the values are to be received into.
192 ;;; Nvals is the number of values that are to be received (should
193 ;;; equal the length of Values).
195 ;;; Move-Temp is a Descriptor-Reg TN used as a temporary.
197 ;;; This code exploits the fact that in the unknown-values convention,
198 ;;; a single value return returns at the return PC + 8, whereas a
199 ;;; return of other than one value returns directly at the return PC.
201 ;;; If 0 or 1 values are expected, then we just emit an instruction to
202 ;;; reset the SP (which will only be executed when other than 1 value
205 ;;; In the general case, we have to do three things:
206 ;;; -- Default unsupplied register values. This need only be done when a
207 ;;; single value is returned, since register values are defaulted by the
208 ;;; called in the non-single case.
209 ;;; -- Default unsupplied stack values. This needs to be done whenever there
210 ;;; are stack values.
211 ;;; -- Reset SP. This must be done whenever other than 1 value is returned,
212 ;;; regardless of the number of values desired.
214 ;;; The general-case code looks like this:
216 b regs-defaulted ; Skip if MVs
219 move a1 null-tn ; Default register values
221 loadi nargs 1 ; Force defaulting of stack values
222 move ocfp csp ; Set up args for SP resetting
225 subu temp nargs register-arg-count
227 bltz temp default-value-7 ; jump to default code
229 loadw move-temp ocfp-tn 6 ; Move value to correct location.
230 store-stack-tn val4-tn move-temp
232 bltz temp default-value-8
234 loadw move-temp ocfp-tn 7
235 store-stack-tn val5-tn move-temp
240 move sp ocfp ; Reset SP.
245 store-stack-tn val4-tn null-tn ; Nil out 7'th value. (first on stack)
248 store-stack-tn val5-tn null-tn ; Nil out 8'th value.
255 (defun default-unknown-values (vop values nvals move-temp temp lra-label)
256 (declare (type (or tn-ref null) values)
257 (type unsigned-byte nvals) (type tn move-temp temp))
260 ;; Note that this is a single-value return point. This is
261 ;; actually the multiple-value entry point for a single
262 ;; desired value, but the code location has to be here, or the
263 ;; debugger backtrace gets confused.
264 (without-scheduling ()
265 (note-this-location vop :single-value-return)
266 (move ocfp-tn csp-tn)
269 (inst compute-code-from-lra code-tn code-tn lra-label temp)))
270 (let ((regs-defaulted (gen-label))
271 (defaulting-done (gen-label))
272 (default-stack-vals (gen-label)))
273 (without-scheduling ()
274 ;; Note that this is an unknown-values return point.
275 (note-this-location vop :unknown-return)
276 ;; If there are no stack results, clear the stack now.
277 (if (> nvals register-arg-count)
278 (inst subq nargs-tn (fixnumize register-arg-count) temp)
279 (move ocfp-tn csp-tn))
280 ;; Branch off to the MV case.
281 (inst br zero-tn regs-defaulted))
283 ;; Do the single value case.
285 (val (tn-ref-across values) (tn-ref-across val)))
286 ((= i (min nvals register-arg-count)))
287 (move null-tn (tn-ref-tn val)))
288 (when (> nvals register-arg-count)
289 (move csp-tn ocfp-tn)
290 (inst br zero-tn default-stack-vals))
292 (emit-label regs-defaulted)
294 (when (> nvals register-arg-count)
295 ;; If there are stack results, we have to default them
296 ;; and clear the stack.
297 (collect ((defaults))
298 (do ((i register-arg-count (1+ i))
299 (val (do ((i 0 (1+ i))
300 (val values (tn-ref-across val)))
301 ((= i register-arg-count) val))
302 (tn-ref-across val)))
305 (let ((default-lab (gen-label))
306 (tn (tn-ref-tn val)))
307 (defaults (cons default-lab tn))
309 (inst blt temp default-lab)
310 (inst ldl move-temp (* i n-word-bytes) ocfp-tn)
311 (inst subq temp (fixnumize 1) temp)
312 (store-stack-tn tn move-temp)))
314 (emit-label defaulting-done)
315 (move ocfp-tn csp-tn)
317 (let ((defaults (defaults)))
319 (assemble (*elsewhere*)
320 (emit-label default-stack-vals)
321 (do ((remaining defaults (cdr remaining)))
323 (let ((def (car remaining)))
324 (emit-label (car def))
325 (when (null (cdr remaining))
326 (inst br zero-tn defaulting-done))
327 (store-stack-tn (cdr def) null-tn)))))))
330 (inst compute-code-from-lra code-tn code-tn lra-label temp))))
333 ;;;; unknown values receiving
335 ;;; Emit code needed at the return point for an unknown-values call
336 ;;; for an arbitrary number of values.
338 ;;; We do the single and non-single cases with no shared code: there
339 ;;; doesn't seem to be any potential overlap, and receiving a single
340 ;;; value is more important efficiency-wise.
342 ;;; When there is a single value, we just push it on the stack,
343 ;;; returning the old SP and 1.
345 ;;; When there is a variable number of values, we move all of the
346 ;;; argument registers onto the stack, and return Args and Nargs.
348 ;;; Args and Nargs are TNs wired to the named locations. We must
349 ;;; explicitly allocate these TNs, since their lifetimes overlap with
350 ;;; the results Start and Count (also, it's nice to be able to target
352 (defun receive-unknown-values (args nargs start count lra-label temp)
353 (declare (type tn args nargs start count temp))
354 (let ((variable-values (gen-label))
356 (without-scheduling ()
357 (inst br zero-tn variable-values)
361 (inst compute-code-from-lra code-tn code-tn lra-label temp))
362 (inst addq csp-tn 4 csp-tn)
363 (storew (first *register-arg-tns*) csp-tn -1)
364 (inst subq csp-tn 4 start)
365 (inst li (fixnumize 1) count)
369 (assemble (*elsewhere*)
370 (emit-label variable-values)
372 (inst compute-code-from-lra code-tn code-tn lra-label temp))
373 (do ((arg *register-arg-tns* (rest arg))
376 (storew (first arg) args i))
379 (inst br zero-tn done)))
382 ;;; a VOP that can be inherited by unknown values receivers. The main
383 ;;; thing this handles is allocation of the result temporaries.
384 (define-vop (unknown-values-receiver)
386 (start :scs (any-reg))
387 (count :scs (any-reg)))
388 (:temporary (:sc descriptor-reg :offset ocfp-offset
389 :from :eval :to (:result 0))
391 (:temporary (:sc any-reg :offset nargs-offset
392 :from :eval :to (:result 1))
394 (:temporary (:scs (non-descriptor-reg)) temp))
396 ;;;; local call with unknown values convention return
398 ;;; Non-TR local call for a fixed number of values passed according to the
399 ;;; unknown values convention.
401 ;;; Args are the argument passing locations, which are specified only to
402 ;;; terminate their lifetimes in the caller.
404 ;;; Values are the return value locations (wired to the standard passing
407 ;;; Save is the save info, which we can ignore since saving has been
408 ;;; done. Return-PC is the TN that the return PC should be passed in.
409 ;;; Target is a continuation pointing to the start of the called
410 ;;; function. Nvals is the number of values received.
412 ;;; Note: we can't use normal load-tn allocation for the fixed args,
413 ;;; since all registers may be tied up by the more operand. Instead,
414 ;;; we use MAYBE-LOAD-STACK-TN.
415 (define-vop (call-local)
419 (:results (values :more t))
421 (:move-args :local-call)
422 (:info arg-locs callee target nvals)
424 (:temporary (:scs (descriptor-reg) :from :eval) move-temp)
425 (:temporary (:scs (non-descriptor-reg)) temp)
426 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
427 (:temporary (:sc any-reg :offset ocfp-offset :from :eval) ocfp)
428 (:ignore arg-locs args ocfp)
430 (let ((label (gen-label))
431 (cur-nfp (current-nfp-tn vop)))
433 (store-stack-tn nfp-save cur-nfp))
434 (let ((callee-nfp (callee-nfp-tn callee)))
435 (maybe-load-stack-nfp-tn callee-nfp nfp temp))
436 (maybe-load-stack-tn cfp-tn fp)
437 (trace-table-entry trace-table-call-site)
438 (inst compute-lra-from-code
439 (callee-return-pc-tn callee) code-tn label temp)
440 (note-this-location vop :call-site)
441 (inst br zero-tn target)
442 (trace-table-entry trace-table-normal)
443 (emit-return-pc label)
444 (default-unknown-values vop values nvals move-temp temp label)
445 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp))))
448 ;;; Non-TR local call for a variable number of return values passed
449 ;;; according to the unknown values convention. The results are the
450 ;;; start of the values glob and the number of values received.
452 ;;; Note: we can't use normal load-tn allocation for the fixed args,
453 ;;; since all registers may be tied up by the more operand. Instead,
454 ;;; we use MAYBE-LOAD-STACK-TN.
455 (define-vop (multiple-call-local unknown-values-receiver)
460 (:move-args :local-call)
461 (:info save callee target)
464 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
465 (:temporary (:scs (non-descriptor-reg)) temp)
467 (let ((label (gen-label))
468 (cur-nfp (current-nfp-tn vop)))
470 (store-stack-tn nfp-save cur-nfp))
471 (let ((callee-nfp (callee-nfp-tn callee)))
472 (maybe-load-stack-nfp-tn callee-nfp nfp temp))
473 (maybe-load-stack-tn cfp-tn fp)
474 (trace-table-entry trace-table-call-site)
475 (inst compute-lra-from-code
476 (callee-return-pc-tn callee) code-tn label temp)
477 (note-this-location vop :call-site)
478 (inst bsr zero-tn target)
479 (trace-table-entry trace-table-normal)
480 (emit-return-pc label)
481 (note-this-location vop :unknown-return)
482 (receive-unknown-values values-start nvals start count label temp)
483 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp))))
486 ;;;; local call with known values return
488 ;;; Non-TR local call with known return locations. Known-value return
489 ;;; works just like argument passing in local call.
491 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
492 ;;; registers may be tied up by the more operand. Instead, we use
493 ;;; MAYBE-LOAD-STACK-TN.
494 (define-vop (known-call-local)
498 (:results (res :more t))
499 (:move-args :local-call)
501 (:info save callee target)
502 (:ignore args res save)
504 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
505 (:temporary (:scs (non-descriptor-reg)) temp)
507 (let ((label (gen-label))
508 (cur-nfp (current-nfp-tn vop)))
510 (store-stack-tn nfp-save cur-nfp))
511 (let ((callee-nfp (callee-nfp-tn callee)))
512 (maybe-load-stack-nfp-tn callee-nfp nfp temp))
513 (maybe-load-stack-tn cfp-tn fp)
514 (trace-table-entry trace-table-call-site)
515 (inst compute-lra-from-code
516 (callee-return-pc-tn callee) code-tn label temp)
517 (note-this-location vop :call-site)
518 (inst bsr zero-tn target)
519 (trace-table-entry trace-table-normal)
520 (emit-return-pc label)
521 (note-this-location vop :known-return)
522 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp))))
524 ;;; Return from known values call. We receive the return locations as
525 ;;; arguments to terminate their lifetimes in the returning function.
526 ;;; We restore FP and CSP and jump to the Return-PC.
528 ;;; Note: we can't use normal load-tn allocation for the fixed args,
529 ;;; since all registers may be tied up by the more operand. Instead,
530 ;;; we use MAYBE-LOAD-STACK-TN.
531 (define-vop (known-return)
532 (:args (ocfp :target ocfp-temp)
533 (return-pc :target return-pc-temp)
535 (:temporary (:sc any-reg :from (:argument 0)) ocfp-temp)
536 (:temporary (:sc any-reg :from (:argument 1))
538 (:temporary (:scs (interior-reg)) lip)
539 (:move-args :known-return)
541 (:ignore val-locs vals)
544 (trace-table-entry trace-table-fun-epilogue)
545 (maybe-load-stack-tn ocfp-temp ocfp)
546 (maybe-load-stack-tn return-pc-temp return-pc)
548 (let ((cur-nfp (current-nfp-tn vop)))
550 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
552 (inst subq return-pc-temp (- other-pointer-lowtag n-word-bytes) lip)
553 (move ocfp-temp cfp-tn)
554 (inst ret zero-tn lip 1)
555 (trace-table-entry trace-table-normal)))
559 ;;;; There is something of a cross-product effect with full calls.
560 ;;;; Different versions are used depending on whether we know the
561 ;;;; number of arguments or the name of the called function, and
562 ;;;; whether we want fixed values, unknown values, or a tail call.
564 ;;;; In full call, the arguments are passed creating a partial frame on
565 ;;;; the stack top and storing stack arguments into that frame. On
566 ;;;; entry to the callee, this partial frame is pointed to by FP. If
567 ;;;; there are no stack arguments, we don't bother allocating a partial
568 ;;;; frame, and instead set FP to SP just before the call.
570 ;;; This macro helps in the definition of full call VOPs by avoiding
571 ;;; code replication in defining the cross-product VOPs.
573 ;;; Name is the name of the VOP to define.
575 ;;; Named is true if the first argument is a symbol whose global
576 ;;; function definition is to be called.
578 ;;; Return is either :FIXED, :UNKNOWN or :TAIL:
579 ;;; -- If :FIXED, then the call is for a fixed number of values, returned
580 ;;; in the standard passing locations (passed as result operands).
581 ;;; -- If :UNKNOWN, then the result values are pushed on the stack, and
582 ;;; the result values are specified by the Start and Count as in the
583 ;;; unknown-values continuation representation.
584 ;;; -- If :TAIL, then do a tail-recursive call. No values are returned.
585 ;;; The Ocfp and Return-PC are passed as the second and third arguments.
587 ;;; In non-tail calls, the pointer to the stack arguments is passed as
588 ;;; the last fixed argument. If Variable is false, then the passing
589 ;;; locations are passed as a more arg. Variable is true if there are
590 ;;; a variable number of arguments passed on the stack. Variable
591 ;;; cannot be specified with :TAIL return. TR variable argument call
592 ;;; is implemented separately.
594 ;;; In tail call with fixed arguments, the passing locations are
595 ;;; passed as a more arg, but there is no new-FP, since the arguments
596 ;;; have been set up in the current frame.
597 (defmacro define-full-call (name named return variable)
598 (assert (not (and variable (eq return :tail))))
600 ,@(when (eq return :unknown)
601 '(unknown-values-receiver)))
603 ,@(unless (eq return :tail)
604 '((new-fp :scs (any-reg) :to :eval)))
607 '(name :target name-pass)
608 '(arg-fun :target lexenv))
610 ,@(when (eq return :tail)
611 '((ocfp :target ocfp-pass)
612 (return-pc :target return-pc-pass)))
614 ,@(unless variable '((args :more t :scs (descriptor-reg)))))
616 ,@(when (eq return :fixed)
617 '((:results (values :more t))))
619 (:save-p ,(if (eq return :tail) :compute-only t))
621 ,@(unless (or (eq return :tail) variable)
622 '((:move-args :full-call)))
625 (:info ,@(unless (or variable (eq return :tail)) '(arg-locs))
626 ,@(unless variable '(nargs))
627 ,@(when (eq return :fixed) '(nvals)))
629 (:ignore #!+gengc ,@(unless (eq return :tail) '(return-pc-pass))
630 ,@(unless (or variable (eq return :tail)) '(arg-locs))
631 ,@(unless variable '(args)))
633 (:temporary (:sc descriptor-reg
636 ,@(unless (eq return :fixed)
640 (:temporary (:sc descriptor-reg
641 :offset #!-gengc lra-offset #!+gengc ra-offset
642 :from (:argument ,(if (eq return :tail) 2 1))
647 `((:temporary (:sc descriptor-reg :offset fdefn-offset
648 :from (:argument ,(if (eq return :tail) 0 1))
652 `((:temporary (:sc descriptor-reg :offset lexenv-offset
653 :from (:argument ,(if (eq return :tail) 0 1))
657 (:temporary (:scs (descriptor-reg) :from (:argument 0) :to :eval)
660 (:temporary (:sc any-reg :offset nargs-offset :to :eval)
664 (mapcar (lambda (name offset)
665 `(:temporary (:sc descriptor-reg
669 register-arg-names *register-arg-offsets*))
670 ,@(when (eq return :fixed)
671 '((:temporary (:scs (descriptor-reg) :from :eval) move-temp)))
673 ,@(unless (eq return :tail)
674 '((:temporary (:scs (non-descriptor-reg)) temp)
675 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)))
677 (:temporary (:sc interior-reg :offset lip-offset) entry-point)
679 (:generator ,(+ (if named 5 0)
681 (if (eq return :tail) 0 10)
683 (if (eq return :unknown) 25 0))
684 (let* ((cur-nfp (current-nfp-tn vop))
685 ,@(unless (eq return :tail)
686 '((lra-label (gen-label))))
690 ,@(if (eq return :tail)
691 '((unless (location= ocfp ocfp-pass)
693 (unless (location= return-pc
704 (flet ((do-next-filler ()
705 (let* ((next (pop filler))
706 (what (if (consp next) (car next) next)))
710 `((inst subq csp-tn new-fp nargs-pass)
712 (mapcar (lambda (name)
717 register-arg-names)))
718 '((inst li (fixnumize nargs) nargs-pass))))
719 ,@(if (eq return :tail)
723 (inst move ocfp ocfp-pass))
726 (ash (tn-offset ocfp)
731 (#!-gengc descriptor-reg #!+gengc any-reg
732 (inst move return-pc return-pc-pass))
734 (inst ldl return-pc-pass
735 (ash (tn-offset return-pc)
740 (bytes-needed-for-non-descriptor-stack-frame)
744 (inst compute-lra-from-code
745 return-pc-pass code-tn lra-label temp))
747 (store-stack-tn nfp-save cur-nfp))
749 (inst move cfp-tn ocfp-pass))
752 '(move new-fp cfp-tn)
753 '(if (> nargs register-arg-count)
755 (move csp-tn cfp-tn)))
756 (trace-table-entry trace-table-call-site))))
761 (descriptor-reg (move name name-pass))
764 (ash (tn-offset name) word-shift) cfp-tn)
768 (- (ash (tn-offset name) word-shift)
769 other-pointer-lowtag) code-tn)
771 (inst ldl entry-point
772 (- (ash fdefn-raw-addr-slot word-shift)
773 other-pointer-lowtag) name-pass)
776 (descriptor-reg (move arg-fun lexenv))
779 (ash (tn-offset arg-fun) word-shift) cfp-tn)
783 (- (ash (tn-offset arg-fun) word-shift)
784 other-pointer-lowtag) code-tn)
788 (- (ash closure-fun-slot word-shift)
789 fun-pointer-lowtag) lexenv)
794 (- (ash simple-fun-code-offset word-shift)
795 fun-pointer-lowtag) entry-point)
797 (inst ldl entry-point
798 (- (ash closure-entry-point-slot word-shift)
799 fun-pointer-lowtag) lexenv)
807 (note-this-location vop :call-site)
809 (inst jsr zero-tn entry-point))
813 '((trace-table-entry trace-table-normal)
814 (emit-return-pc lra-label)
815 (default-unknown-values vop values nvals
816 move-temp temp lra-label)
817 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp)))
819 '((trace-table-entry trace-table-normal)
820 (emit-return-pc lra-label)
821 (note-this-location vop :unknown-return)
822 (receive-unknown-values values-start nvals start count
824 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp)))
827 (define-full-call call nil :fixed nil)
828 (define-full-call call-named t :fixed nil)
829 (define-full-call multiple-call nil :unknown nil)
830 (define-full-call multiple-call-named t :unknown nil)
831 (define-full-call tail-call nil :tail nil)
832 (define-full-call tail-call-named t :tail nil)
834 (define-full-call call-variable nil :fixed t)
835 (define-full-call multiple-call-variable nil :unknown t)
837 ;;; This is defined separately, since it needs special code that blits
838 ;;; the arguments down.
839 (define-vop (tail-call-variable)
841 (args-arg :scs (any-reg) :target args)
842 (function-arg :scs (descriptor-reg) :target lexenv)
843 (ocfp-arg :scs (any-reg) :target ocfp)
844 (lra-arg :scs (#!-gengc descriptor-reg #!+gengc any-reg) :target lra))
846 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 0)) args)
847 (:temporary (:sc any-reg :offset lexenv-offset :from (:argument 1)) lexenv)
848 (:temporary (:sc any-reg :offset ocfp-offset :from (:argument 2)) ocfp)
849 (:temporary (:sc any-reg :offset #!-gengc lra-offset #!+gengc ra-offset
850 :from (:argument 3)) lra)
851 (:temporary (:scs (non-descriptor-reg)) temp)
857 ;; Move these into the passing locations if they are not already there.
859 (move function-arg lexenv)
863 ;; Clear the number stack if anything is there.
864 (let ((cur-nfp (current-nfp-tn vop)))
866 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
869 ;; And jump to the assembly-routine that does the bliting.
870 (inst li (make-fixup 'tail-call-variable :assembly-routine) temp)
871 (inst jmp zero-tn temp)))
873 ;;;; unknown values return
875 ;;; Return a single value using the unknown-values convention.
876 (define-vop (return-single)
877 (:args (ocfp :scs (any-reg))
878 #!-gengc (return-pc :scs (descriptor-reg))
879 #!+gengc (return-pc :scs (any-reg) :target ra)
882 #!-gengc (:temporary (:scs (interior-reg)) lip)
883 #!+gengc (:temporary (:sc any-reg :offset ra-offset :from (:argument 1)) ra)
884 #!+gengc (:temporary (:scs (any-reg) :from (:argument 1)) temp)
887 ;; Clear the number stack.
888 (trace-table-entry trace-table-fun-epilogue)
889 (let ((cur-nfp (current-nfp-tn vop)))
891 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
893 ;; Clear the control stack, and restore the frame pointer.
897 #!-gengc (lisp-return return-pc lip :offset 2)
900 (inst addq return-pc (* 2 n-word-bytes) temp)
901 (unless (location= ra return-pc)
902 (inst move ra return-pc))
903 (inst ret zero-tn temp 1))
904 (trace-table-entry trace-table-normal)))
906 ;;; Do unknown-values return of a fixed number of values. The Values
907 ;;; are required to be set up in the standard passing locations. Nvals
908 ;;; is the number of values returned.
910 ;;; If returning a single value, then deallocate the current frame,
911 ;;; restore FP and jump to the single-value entry at Return-PC + 8.
913 ;;; If returning other than one value, then load the number of values
914 ;;; returned, NIL out unsupplied values registers, restore FP and
915 ;;; return at Return-PC. When there are stack values, we must
916 ;;; initialize the argument pointer to point to the beginning of the
917 ;;; values block (which is the beginning of the current frame.)
919 (:args (ocfp :scs (any-reg))
920 (return-pc :scs (#!-gengc descriptor-reg #!+gengc any-reg)
922 #!+gengc :target #!+gengc ra)
926 (:temporary (:sc descriptor-reg :offset a0-offset :from (:eval 0)) a0)
927 (:temporary (:sc descriptor-reg :offset a1-offset :from (:eval 0)) a1)
928 (:temporary (:sc descriptor-reg :offset a2-offset :from (:eval 0)) a2)
929 (:temporary (:sc descriptor-reg :offset a3-offset :from (:eval 0)) a3)
930 (:temporary (:sc descriptor-reg :offset a4-offset :from (:eval 0)) a4)
931 (:temporary (:sc descriptor-reg :offset a5-offset :from (:eval 0)) a5)
932 (:temporary (:sc any-reg :offset nargs-offset) nargs)
933 (:temporary (:sc any-reg :offset ocfp-offset) val-ptr)
934 #!-gengc (:temporary (:scs (interior-reg)) lip)
935 #!+gengc (:temporary (:sc any-reg :offset ra-offset :from (:eval 1)) ra)
938 ;; Clear the number stack.
939 (trace-table-entry trace-table-fun-epilogue)
940 (let ((cur-nfp (current-nfp-tn vop)))
942 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
944 ;; Establish the values pointer and values count.
945 (move cfp-tn val-ptr)
946 (inst li (fixnumize nvals) nargs)
947 ;; restore the frame pointer and clear as much of the control
948 ;; stack as possible.
950 (inst addq val-ptr (* nvals n-word-bytes) csp-tn)
951 ;; pre-default any argument register that need it.
952 (when (< nvals register-arg-count)
953 (dolist (reg (subseq (list a0 a1 a2 a3 a4 a5) nvals))
956 (lisp-return return-pc lip)
957 (trace-table-entry trace-table-normal)))
959 ;;; Do unknown-values return of an arbitrary number of values (passed
960 ;;; on the stack.) We check for the common case of a single return
961 ;;; value, and do that inline using the normal single value return
962 ;;; convention. Otherwise, we branch off to code that calls an
963 ;;; assembly-routine.
964 (define-vop (return-multiple)
965 (:args (ocfp-arg :scs (any-reg) :target ocfp)
966 #!-gengc (lra-arg :scs (descriptor-reg) :target lra)
967 #!+gengc (return-pc :scs (any-reg) :target ra)
968 (vals-arg :scs (any-reg) :target vals)
969 (nvals-arg :scs (any-reg) :target nvals))
971 (:temporary (:sc any-reg :offset nl1-offset :from (:argument 0)) ocfp)
973 (:temporary (:sc descriptor-reg :offset lra-offset :from (:argument 1)) lra)
975 (:temporary (:sc any-reg :offset ra-offset :from (:argument 1)) ra)
976 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 2)) vals)
977 (:temporary (:sc any-reg :offset nargs-offset :from (:argument 3)) nvals)
978 (:temporary (:sc descriptor-reg :offset a0-offset) a0)
979 (:temporary (:scs (non-descriptor-reg)) temp)
980 #!-gengc (:temporary (:scs (interior-reg)) lip)
981 #!+gengc (:temporary (:scs (any-reg) :from (:argument 0)) temp)
986 (trace-table-entry trace-table-fun-epilogue)
987 (let ((not-single (gen-label)))
988 ;; Clear the number stack.
989 (let ((cur-nfp (current-nfp-tn vop)))
991 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
994 ;; Check for the single case.
995 (inst li (fixnumize 1) a0)
996 (inst cmpeq nvals-arg a0 temp)
997 (inst ldl a0 0 vals-arg)
998 (inst beq temp not-single)
1000 ;; Return with one value.
1001 (move cfp-tn csp-tn)
1002 (move ocfp-arg cfp-tn)
1003 (lisp-return lra-arg lip :offset 2)
1005 ;; Nope, not the single case.
1006 (emit-label not-single)
1007 (move ocfp-arg ocfp)
1009 (move vals-arg vals)
1010 (move nvals-arg nvals)
1011 (inst li (make-fixup 'return-multiple :assembly-routine) temp)
1012 (inst jmp zero-tn temp))
1013 (trace-table-entry trace-table-normal)))
1017 ;;; We don't need to do anything special for regular functions.
1018 (define-vop (setup-environment)
1022 ;; Don't bother doing anything.
1025 ;;; Get the lexical environment from its passing location.
1026 (define-vop (setup-closure-environment)
1027 (:temporary (:sc descriptor-reg :offset lexenv-offset :target closure
1030 (:results (closure :scs (descriptor-reg)))
1035 (move lexenv closure)))
1037 ;;; Copy a &MORE arg from the argument area to the end of the current
1038 ;;; frame. FIXED is the number of non-&MORE arguments.
1039 (define-vop (copy-more-arg)
1040 (:temporary (:sc any-reg :offset nl0-offset) result)
1041 (:temporary (:sc any-reg :offset nl1-offset) count)
1042 (:temporary (:sc any-reg :offset nl2-offset) src)
1043 (:temporary (:sc any-reg :offset nl4-offset) dst)
1044 (:temporary (:sc descriptor-reg :offset l0-offset) temp)
1047 (let ((loop (gen-label))
1048 (do-regs (gen-label))
1050 (when (< fixed register-arg-count)
1051 ;; Save a pointer to the results so we can fill in register
1052 ;; args. We don't need this if there are more fixed args than
1054 (move csp-tn result))
1055 ;; Allocate the space on the stack.
1056 (cond ((zerop fixed)
1057 (inst addq csp-tn nargs-tn csp-tn)
1058 (inst beq nargs-tn done))
1060 (inst subq nargs-tn (fixnumize fixed) count)
1061 (inst ble count done)
1062 (inst addq csp-tn count csp-tn)))
1063 (when (< fixed register-arg-count)
1064 ;; We must stop when we run out of stack args, not when we run
1065 ;; out of &MORE args.
1066 (inst subq nargs-tn (fixnumize register-arg-count) count))
1067 ;; Initialize dst to be end of stack.
1069 ;; Everything of interest in registers.
1070 (inst ble count do-regs)
1071 ;; Initialize SRC to be end of args.
1072 (inst addq cfp-tn nargs-tn src)
1075 ;; *--dst = *--src, --count
1076 (inst subq src n-word-bytes src)
1077 (inst subq count (fixnumize 1) count)
1079 (inst subq dst n-word-bytes dst)
1081 (inst bgt count loop)
1083 (emit-label do-regs)
1084 (when (< fixed register-arg-count)
1085 ;; Now we have to deposit any more args that showed up in
1086 ;; registers. We know there is at least one &MORE arg,
1087 ;; otherwise we would have branched to DONE up at the top.
1088 (inst subq nargs-tn (fixnumize (1+ fixed)) count)
1089 (do ((i fixed (1+ i)))
1090 ((>= i register-arg-count))
1091 ;; Store it relative to the pointer saved at the start.
1092 (storew (nth i *register-arg-tns*) result (- i fixed))
1093 ;; Is this the last one?
1094 (inst beq count done)
1096 (inst subq count (fixnumize 1) count)))
1097 (emit-label done))))
1099 ;;; &MORE args are stored consecutively on the stack, starting
1100 ;;; immediately at the context pointer. The context pointer is not
1101 ;;; typed, so the lowtag is 0.
1102 (define-full-reffer more-arg * 0 0 (descriptor-reg any-reg) * %more-arg)
1104 ;;; Turn &MORE arg (context, count) into a list.
1105 (define-vop (listify-rest-args)
1106 (:args (context-arg :target context :scs (descriptor-reg))
1107 (count-arg :target count :scs (any-reg)))
1108 (:arg-types * tagged-num)
1109 (:temporary (:scs (any-reg) :from (:argument 0)) context)
1110 (:temporary (:scs (any-reg) :from (:argument 1)) count)
1111 (:temporary (:scs (descriptor-reg) :from :eval) temp dst)
1112 (:results (result :scs (descriptor-reg)))
1113 (:translate %listify-rest-args)
1116 (let ((enter (gen-label))
1119 (move context-arg context)
1120 (move count-arg count)
1121 ;; Check to see if there are any arguments.
1122 (move null-tn result)
1123 (inst beq count done)
1125 ;; We need to do this atomically.
1127 ;; Allocate a cons (2 words) for each item.
1128 (inst bis alloc-tn list-pointer-lowtag result)
1130 (inst sll count 1 temp)
1131 (inst addq alloc-tn temp alloc-tn)
1132 (inst br zero-tn enter)
1134 ;; Store the current cons in the cdr of the previous cons.
1136 (inst addq dst (* 2 n-word-bytes) dst)
1137 (storew dst dst -1 list-pointer-lowtag)
1141 (loadw temp context)
1142 (inst addq context n-word-bytes context)
1144 ;; Store the value in the car (in delay slot)
1145 (storew temp dst 0 list-pointer-lowtag)
1147 ;; Decrement count, and if != zero, go back for more.
1148 (inst subq count (fixnumize 1) count)
1149 (inst bne count loop)
1151 ;; NIL out the last cons.
1152 (storew null-tn dst 1 list-pointer-lowtag))
1153 (emit-label done))))
1155 ;;; Return the location and size of the &MORE arg glob created by
1156 ;;; COPY-MORE-ARG. Supplied is the total number of arguments supplied
1157 ;;; (originally passed in NARGS.) Fixed is the number of non-&rest
1160 ;;; We must duplicate some of the work done by COPY-MORE-ARG, since at
1161 ;;; that time the environment is in a pretty brain-damaged state,
1162 ;;; preventing this info from being returned as values. What we do is
1163 ;;; compute supplied - fixed, and return a pointer that many words
1164 ;;; below the current stack top.
1165 (define-vop (more-arg-context)
1166 (:policy :fast-safe)
1167 (:translate sb!c::%more-arg-context)
1168 (:args (supplied :scs (any-reg)))
1169 (:arg-types tagged-num (:constant fixnum))
1171 (:results (context :scs (descriptor-reg))
1172 (count :scs (any-reg)))
1173 (:result-types t tagged-num)
1174 (:note "more-arg-context")
1176 (inst subq supplied (fixnumize fixed) count)
1177 (inst subq csp-tn count context)))
1179 ;;; Signal wrong argument count error if NARGS isn't equal to COUNT.
1180 (define-vop (verify-arg-count)
1181 (:policy :fast-safe)
1182 (:translate sb!c::%verify-arg-count)
1183 (:args (nargs :scs (any-reg)))
1184 (:arg-types positive-fixnum (:constant t))
1185 (:temporary (:scs (any-reg) :type fixnum) temp)
1188 (:save-p :compute-only)
1191 (generate-error-code vop invalid-arg-count-error nargs)))
1192 (cond ((zerop count)
1193 (inst bne nargs err-lab))
1195 (inst subq nargs (fixnumize count) temp)
1196 (inst bne temp err-lab))))))
1198 ;;; various other error signalers
1199 (macrolet ((frob (name error translate &rest args)
1200 `(define-vop (,name)
1202 `((:policy :fast-safe)
1203 (:translate ,translate)))
1204 (:args ,@(mapcar (lambda (arg)
1205 `(,arg :scs (any-reg descriptor-reg)))
1208 (:save-p :compute-only)
1210 (error-call vop ,error ,@args)))))
1211 (frob arg-count-error invalid-arg-count-error
1212 sb!c::%arg-count-error nargs)
1213 (frob type-check-error object-not-type-error sb!c::%type-check-error
1215 (frob layout-invalid-error layout-invalid-error sb!c::%layout-invalid-error
1217 (frob odd-key-args-error odd-key-args-error
1218 sb!c::%odd-key-args-error)
1219 (frob unknown-key-arg-error unknown-key-arg-error
1220 sb!c::%unknown-key-arg-error key)
1221 (frob nil-fun-returned-error nil-fun-returned-error nil fun))