1 ;;;; the VM definition of function call for MIPS
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 is
29 ;;; true, then use the standard (full call) location, otherwise use any legal
30 ;;; location. Even in the non-standard case, this may be restricted by a
31 ;;; 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 ;;; Make the TNs used to hold OLD-FP and RETURN-PC within the current
48 ;;; function. We treat these specially so that the debugger can find
49 ;;; 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 only
63 ;;; need to make the standard location, since a count is never passed when we
64 ;;; 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 allocated
70 ;;; 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 unknown-values
82 ;;; 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 push
90 ;;; placeholder entries in the Constants to leave room for additional
91 ;;; 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 ;;; BYTES-NEEDED-FOR-NON-DESCRIPTOR-STACK-FRAME -- internal
104 ;;; Return the number of bytes needed for the current non-descriptor stack
105 ;;; frame. Non-descriptor stack frames must be multiples of 8 bytes on
108 (defun bytes-needed-for-non-descriptor-stack-frame ()
109 (* (logandc2 (1+ (sb-allocated-size 'non-descriptor-stack)) 1)
112 ;;; Used for setting up the Old-FP in local call.
114 (define-vop (current-fp)
115 (:results (val :scs (any-reg)))
119 ;;; Used for computing the caller's NFP for use in known-values return. Only
120 ;;; works assuming there is no variable size stuff on the nstack.
122 (define-vop (compute-old-nfp)
123 (:results (val :scs (any-reg)))
126 (let ((nfp (current-nfp-tn vop)))
128 (inst addu val nfp (bytes-needed-for-non-descriptor-stack-frame))))))
131 (define-vop (xep-allocate-frame)
132 (:info start-lab copy-more-arg-follows)
133 (:ignore copy-more-arg-follows)
135 (:temporary (:scs (non-descriptor-reg)) temp)
137 ;; Make sure the function is aligned, and drop a label pointing to this
139 (align n-lowtag-bits)
140 (trace-table-entry trace-table-fun-prologue)
141 (emit-label start-lab)
142 ;; Allocate function header.
143 (inst simple-fun-header-word)
144 (dotimes (i (1- simple-fun-code-offset))
146 ;; The start of the actual code.
147 ;; Compute CODE from the address of this entry point.
148 (let ((entry-point (gen-label)))
149 (emit-label entry-point)
150 (inst compute-code-from-lip code-tn lip-tn entry-point temp)
151 ;; ### We should also save it on the stack so that the garbage collector
152 ;; won't forget about us if we call anyone else.
154 ;; Build our stack frames.
155 (inst addu csp-tn cfp-tn
156 (* n-word-bytes (sb-allocated-size 'control-stack)))
157 (let ((nfp (current-nfp-tn vop)))
159 (inst addu nsp-tn nsp-tn
160 (- (bytes-needed-for-non-descriptor-stack-frame)))
162 (trace-table-entry trace-table-normal)))
164 (define-vop (allocate-frame)
165 (:results (res :scs (any-reg))
166 (nfp :scs (any-reg)))
169 (trace-table-entry trace-table-fun-prologue)
171 (inst addu csp-tn csp-tn
172 (* n-word-bytes (sb-allocated-size 'control-stack)))
173 (when (ir2-physenv-number-stack-p callee)
174 (inst addu nsp-tn nsp-tn
175 (- (bytes-needed-for-non-descriptor-stack-frame)))
177 (trace-table-entry trace-table-normal)))
179 ;;; Allocate a partial frame for passing stack arguments in a full call. Nargs
180 ;;; is the number of arguments passed. If no stack arguments are passed, then
181 ;;; we don't have to do anything.
183 (define-vop (allocate-full-call-frame)
185 (:results (res :scs (any-reg)))
187 (when (> nargs register-arg-count)
189 (inst addu csp-tn csp-tn (* nargs n-word-bytes)))))
194 ;;; Emit code needed at the return-point from an unknown-values call for a
195 ;;; fixed number of values. Values is the head of the TN-Ref list for the
196 ;;; locations that the values are to be received into. Nvals is the number of
197 ;;; values that are to be received (should equal the length of Values).
199 ;;; MOVE-TEMP is a DESCRIPTOR-REG TN used as a temporary.
201 ;;; This code exploits the fact that in the unknown-values convention, a
202 ;;; single value return returns at the return PC + 8, whereas a return of other
203 ;;; than one value returns directly at the return PC.
205 ;;; If 0 or 1 values are expected, then we just emit an instruction to reset
206 ;;; the SP (which will only be executed when other than 1 value is returned.)
208 ;;; In the general case, we have to do three things:
209 ;;; -- Default unsupplied register values. This need only be done when a
210 ;;; single value is returned, since register values are defaulted by the
211 ;;; callee in the non-single case.
212 ;;; -- Default unsupplied stack values. This needs to be done whenever there
213 ;;; are stack values.
214 ;;; -- Reset SP. This must be done whenever other than 1 value is returned,
215 ;;; regardless of the number of values desired.
217 ;;; The general-case code looks like this:
219 b regs-defaulted ; Skip if MVs
222 move a1 null-tn ; Default register values
224 loadi nargs 1 ; Force defaulting of stack values
225 move ocfp csp ; Set up args for SP resetting
228 subu temp nargs register-arg-count
230 bltz temp default-value-7 ; jump to default code
232 loadw move-temp ocfp-tn 6 ; Move value to correct location.
233 store-stack-tn val4-tn move-temp
235 bltz temp default-value-8
237 loadw move-temp ocfp-tn 7
238 store-stack-tn val5-tn move-temp
243 move csp ocfp ; Reset SP.
248 store-stack-tn val4-tn null-tn ; Nil out 7'th value. (first on stack)
251 store-stack-tn val5-tn null-tn ; Nil out 8'th value.
259 (defun default-unknown-values (vop values nvals move-temp temp lra-label)
260 (declare (type (or tn-ref null) values)
261 (type unsigned-byte nvals) (type tn move-temp temp))
264 ;; Note that this is a single-value return point. This is actually
265 ;; the multiple-value entry point for a single desired value, but
266 ;; the code location has to be here, or the debugger backtrace
268 (without-scheduling ()
269 (note-this-location vop :single-value-return)
270 (inst move csp-tn ocfp-tn)
273 (inst compute-code-from-lra code-tn code-tn lra-label temp)))
274 (let ((regs-defaulted (gen-label))
275 (defaulting-done (gen-label))
276 (default-stack-vals (gen-label)))
277 (without-scheduling ()
278 ;; Note that this is an unknown-values return point.
279 (note-this-location vop :unknown-return)
280 ;; Branch off to the MV case.
281 (inst b regs-defaulted)
282 ;; If there are no stack results, clear the stack now.
283 (if (> nvals register-arg-count)
284 (inst addu temp nargs-tn (fixnumize (- register-arg-count)))
285 (move csp-tn ocfp-tn t)))
287 ;; Do the single value case.
289 (val (tn-ref-across values) (tn-ref-across val)))
290 ((= i (min nvals register-arg-count)))
291 (move (tn-ref-tn val) null-tn))
292 (when (> nvals register-arg-count)
293 (inst b default-stack-vals)
294 (move ocfp-tn csp-tn t))
296 (emit-label regs-defaulted)
298 (when (> nvals register-arg-count)
299 ;; If there are stack results, we have to default them
300 ;; and clear the stack.
301 (collect ((defaults))
302 (do ((i register-arg-count (1+ i))
303 (val (do ((i 0 (1+ i))
304 (val values (tn-ref-across val)))
305 ((= i register-arg-count) val))
306 (tn-ref-across val)))
309 (let ((default-lab (gen-label))
310 (tn (tn-ref-tn val)))
311 (defaults (cons default-lab tn))
313 (inst blez temp default-lab)
314 (inst lw move-temp ocfp-tn (* i n-word-bytes))
315 (inst addu temp temp (fixnumize -1))
316 (store-stack-tn tn move-temp)))
318 (emit-label defaulting-done)
319 (move csp-tn ocfp-tn)
321 (let ((defaults (defaults)))
323 (assemble (*elsewhere*)
324 (emit-label default-stack-vals)
325 (trace-table-entry trace-table-fun-prologue)
326 (do ((remaining defaults (cdr remaining)))
328 (let ((def (car remaining)))
329 (emit-label (car def))
330 (when (null (cdr remaining))
331 (inst b defaulting-done))
332 (store-stack-tn (cdr def) null-tn)))
333 (trace-table-entry trace-table-normal)))))
336 (inst compute-code-from-lra code-tn code-tn lra-label temp))))
340 ;;;; Unknown values receiving:
342 ;;; Emit code needed at the return point for an unknown-values call for an
343 ;;; arbitrary number of values.
345 ;;; We do the single and non-single cases with no shared code: there doesn't
346 ;;; seem to be any potential overlap, and receiving a single value is more
347 ;;; important efficiency-wise.
349 ;;; When there is a single value, we just push it on the stack, returning
350 ;;; the old SP and 1.
352 ;;; When there is a variable number of values, we move all of the argument
353 ;;; registers onto the stack, and return Args and Nargs.
355 ;;; Args and Nargs are TNs wired to the named locations. We must
356 ;;; explicitly allocate these TNs, since their lifetimes overlap with the
357 ;;; results Start and Count (also, it's nice to be able to target them).
359 (defun receive-unknown-values (args nargs start count lra-label temp)
360 (declare (type tn args nargs start count temp))
361 (let ((variable-values (gen-label))
363 (without-scheduling ()
364 (inst b variable-values)
368 (inst compute-code-from-lra code-tn code-tn lra-label temp))
369 (inst addu csp-tn csp-tn 4)
370 (storew (first *register-arg-tns*) csp-tn -1)
371 (inst addu start csp-tn -4)
372 (inst li count (fixnumize 1))
376 (assemble (*elsewhere*)
377 (trace-table-entry trace-table-fun-prologue)
378 (emit-label variable-values)
380 (inst compute-code-from-lra code-tn code-tn lra-label temp))
381 (do ((arg *register-arg-tns* (rest arg))
384 (storew (first arg) args i))
388 (trace-table-entry trace-table-normal)))
392 ;;; VOP that can be inherited by unknown values receivers. The main thing this
393 ;;; handles is allocation of the result temporaries.
395 (define-vop (unknown-values-receiver)
397 (start :scs (any-reg))
398 (count :scs (any-reg)))
399 (:temporary (:sc descriptor-reg :offset ocfp-offset
400 :from :eval :to (:result 0))
402 (:temporary (:sc any-reg :offset nargs-offset
403 :from :eval :to (:result 1))
405 (:temporary (:scs (non-descriptor-reg)) temp))
409 ;;;; Local call with unknown values convention return:
411 ;;; Non-TR local call for a fixed number of values passed according to the
412 ;;; unknown values convention.
414 ;;; Args are the argument passing locations, which are specified only to
415 ;;; terminate their lifetimes in the caller.
417 ;;; Values are the return value locations (wired to the standard passing
420 ;;; Save is the save info, which we can ignore since saving has been done.
421 ;;; Return-PC is the TN that the return PC should be passed in.
422 ;;; Target is a continuation pointing to the start of the called function.
423 ;;; Nvals is the number of values received.
425 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
426 ;;; registers may be tied up by the more operand. Instead, we use
427 ;;; MAYBE-LOAD-STACK-TN.
429 (define-vop (call-local)
433 (:results (values :more t))
435 (:move-args :local-call)
436 (:info arg-locs callee target nvals)
438 (:temporary (:scs (descriptor-reg) :from :eval) move-temp)
439 (:temporary (:scs (non-descriptor-reg)) temp)
440 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
441 (:temporary (:sc any-reg :offset ocfp-offset :from :eval) ocfp)
442 (:ignore arg-locs args ocfp)
444 (let ((label (gen-label))
445 (cur-nfp (current-nfp-tn vop)))
447 (store-stack-tn nfp-save cur-nfp))
448 (let ((callee-nfp (callee-nfp-tn callee)))
450 (maybe-load-stack-tn callee-nfp nfp)))
451 (maybe-load-stack-tn cfp-tn fp)
452 (trace-table-entry trace-table-call-site)
453 (inst compute-lra-from-code
454 (callee-return-pc-tn callee) code-tn label temp)
455 (note-this-location vop :call-site)
458 (trace-table-entry trace-table-normal)
459 (emit-return-pc label)
460 (default-unknown-values vop values nvals move-temp temp label)
462 (load-stack-tn cur-nfp nfp-save)))))
465 ;;; Non-TR local call for a variable number of return values passed according
466 ;;; to the unknown values convention. The results are the start of the values
467 ;;; glob and the number of values received.
469 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
470 ;;; registers may be tied up by the more operand. Instead, we use
471 ;;; MAYBE-LOAD-STACK-TN.
473 (define-vop (multiple-call-local unknown-values-receiver)
478 (:move-args :local-call)
479 (:info save callee target)
482 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
484 (let ((label (gen-label))
485 (cur-nfp (current-nfp-tn vop)))
487 (store-stack-tn nfp-save cur-nfp))
488 (let ((callee-nfp (callee-nfp-tn callee)))
490 (maybe-load-stack-tn callee-nfp nfp)))
491 (maybe-load-stack-tn cfp-tn fp)
492 (trace-table-entry trace-table-call-site)
493 (inst compute-lra-from-code
494 (callee-return-pc-tn callee) code-tn label temp)
495 (note-this-location vop :call-site)
498 (trace-table-entry trace-table-normal)
499 (emit-return-pc label)
500 (note-this-location vop :unknown-return)
501 (receive-unknown-values values-start nvals start count label temp)
503 (load-stack-tn cur-nfp nfp-save)))))
506 ;;;; Local call with known values return:
508 ;;; Non-TR local call with known return locations. Known-value return works
509 ;;; just like argument passing in local call.
511 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
512 ;;; registers may be tied up by the more operand. Instead, we use
513 ;;; MAYBE-LOAD-STACK-TN.
515 (define-vop (known-call-local)
519 (:results (res :more t))
520 (:move-args :local-call)
522 (:info save callee target)
523 (:ignore args res save)
525 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
526 (:temporary (:scs (non-descriptor-reg)) temp)
528 (let ((label (gen-label))
529 (cur-nfp (current-nfp-tn vop)))
531 (store-stack-tn nfp-save cur-nfp))
532 (let ((callee-nfp (callee-nfp-tn callee)))
534 (maybe-load-stack-tn callee-nfp nfp)))
535 (maybe-load-stack-tn cfp-tn fp)
536 (trace-table-entry trace-table-call-site)
537 (inst compute-lra-from-code
538 (callee-return-pc-tn callee) code-tn label temp)
539 (note-this-location vop :call-site)
542 (trace-table-entry trace-table-normal)
543 (emit-return-pc label)
544 (note-this-location vop :known-return)
546 (load-stack-tn cur-nfp nfp-save)))))
548 ;;; Return from known values call. We receive the return locations as
549 ;;; arguments to terminate their lifetimes in the returning function. We
550 ;;; restore FP and CSP and jump to the Return-PC.
552 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
553 ;;; registers may be tied up by the more operand. Instead, we use
554 ;;; MAYBE-LOAD-STACK-TN.
556 (define-vop (known-return)
557 (:args (ocfp :target ocfp-temp)
558 (return-pc :target return-pc-temp)
560 (:temporary (:sc any-reg :from (:argument 0)) ocfp-temp)
561 (:temporary (:sc descriptor-reg :from (:argument 1))
563 (:temporary (:scs (interior-reg)) lip)
564 (:move-args :known-return)
566 (:ignore val-locs vals)
569 (trace-table-entry trace-table-fun-epilogue)
570 (maybe-load-stack-tn ocfp-temp ocfp)
571 (maybe-load-stack-tn return-pc-temp return-pc)
573 (let ((cur-nfp (current-nfp-tn vop)))
575 (inst addu nsp-tn cur-nfp
576 (bytes-needed-for-non-descriptor-stack-frame))))
577 (inst addu lip return-pc-temp (- n-word-bytes other-pointer-lowtag))
579 (move cfp-tn ocfp-temp t)
580 (trace-table-entry trace-table-normal)))
585 ;;; There is something of a cross-product effect with full calls. Different
586 ;;; versions are used depending on whether we know the number of arguments or
587 ;;; the name of the called function, and whether we want fixed values, unknown
588 ;;; values, or a tail call.
590 ;;; In full call, the arguments are passed creating a partial frame on the
591 ;;; stack top and storing stack arguments into that frame. On entry to the
592 ;;; callee, this partial frame is pointed to by FP. If there are no stack
593 ;;; arguments, we don't bother allocating a partial frame, and instead set FP
594 ;;; to SP just before the call.
596 ;;; This macro helps in the definition of full call VOPs by avoiding code
597 ;;; replication in defining the cross-product VOPs.
599 ;;; Name is the name of the VOP to define.
601 ;;; Named is true if the first argument is a symbol whose global function
602 ;;; definition is to be called.
604 ;;; Return is either :Fixed, :Unknown or :Tail:
605 ;;; -- If :Fixed, then the call is for a fixed number of values, returned in
606 ;;; the standard passing locations (passed as result operands).
607 ;;; -- If :Unknown, then the result values are pushed on the stack, and the
608 ;;; result values are specified by the Start and Count as in the
609 ;;; unknown-values continuation representation.
610 ;;; -- If :Tail, then do a tail-recursive call. No values are returned.
611 ;;; The Ocfp and Return-PC are passed as the second and third arguments.
613 ;;; In non-tail calls, the pointer to the stack arguments is passed as the last
614 ;;; fixed argument. If Variable is false, then the passing locations are
615 ;;; passed as a more arg. Variable is true if there are a variable number of
616 ;;; arguments passed on the stack. Variable cannot be specified with :Tail
617 ;;; return. TR variable argument call is implemented separately.
619 ;;; In tail call with fixed arguments, the passing locations are passed as a
620 ;;; more arg, but there is no new-FP, since the arguments have been set up in
621 ;;; the current frame.
623 (defmacro define-full-call (name named return variable)
624 (aver (not (and variable (eq return :tail))))
626 ,@(when (eq return :unknown)
627 '(unknown-values-receiver)))
629 ,@(unless (eq return :tail)
630 '((new-fp :scs (any-reg) :to :eval)))
633 '(name :target name-pass)
634 '(arg-fun :target lexenv))
636 ,@(when (eq return :tail)
637 '((ocfp :target ocfp-pass)
638 (return-pc :target return-pc-pass)))
640 ,@(unless variable '((args :more t :scs (descriptor-reg)))))
642 ,@(when (eq return :fixed)
643 '((:results (values :more t))))
645 (:save-p ,(if (eq return :tail) :compute-only t))
647 ,@(unless (or (eq return :tail) variable)
648 '((:move-args :full-call)))
651 (:info ,@(unless (or variable (eq return :tail)) '(arg-locs))
652 ,@(unless variable '(nargs))
653 ,@(when (eq return :fixed) '(nvals)))
655 (:ignore ,@(unless (or variable (eq return :tail)) '(arg-locs))
656 ,@(unless variable '(args)))
658 (:temporary (:sc descriptor-reg
661 ,@(unless (eq return :fixed)
665 (:temporary (:sc descriptor-reg
667 :from (:argument ,(if (eq return :tail) 2 1))
672 `((:temporary (:sc descriptor-reg :offset fdefn-offset
673 :from (:argument ,(if (eq return :tail) 0 1))
677 `((:temporary (:sc descriptor-reg :offset lexenv-offset
678 :from (:argument ,(if (eq return :tail) 0 1))
681 (:temporary (:scs (descriptor-reg) :from (:argument 0) :to :eval)
684 (:temporary (:sc any-reg :offset nargs-offset :to :eval)
688 (mapcar #'(lambda (name offset)
689 `(:temporary (:sc descriptor-reg
693 register-arg-names *register-arg-offsets*))
694 ,@(when (eq return :fixed)
695 '((:temporary (:scs (descriptor-reg) :from :eval) move-temp)))
697 ,@(unless (eq return :tail)
698 '((:temporary (:scs (non-descriptor-reg)) temp)
699 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)))
701 (:temporary (:sc interior-reg :offset lip-offset) entry-point)
703 (:generator ,(+ (if named 5 0)
705 (if (eq return :tail) 0 10)
707 (if (eq return :unknown) 25 0))
708 (let* ((cur-nfp (current-nfp-tn vop))
709 ,@(unless (eq return :tail)
710 '((lra-label (gen-label))))
714 ,@(if (eq return :tail)
715 '((unless (location= ocfp ocfp-pass)
717 (unless (location= return-pc
727 (flet ((do-next-filler ()
728 (let* ((next (pop filler))
729 (what (if (consp next) (car next) next)))
733 `((inst subu nargs-pass csp-tn new-fp)
735 (mapcar #'(lambda (name)
736 `(inst lw ,name new-fp
739 register-arg-names)))
740 '((inst li nargs-pass (fixnumize nargs)))))
741 ,@(if (eq return :tail)
745 (move ocfp-pass ocfp t))
747 (inst lw ocfp-pass cfp-tn
748 (ash (tn-offset ocfp)
753 (move return-pc-pass return-pc t))
755 (inst lw return-pc-pass cfp-tn
756 (ash (tn-offset return-pc)
759 (inst addu nsp-tn cur-nfp
760 (bytes-needed-for-non-descriptor-stack-frame))))
762 (inst compute-lra-from-code
763 return-pc-pass code-tn lra-label temp))
765 (store-stack-tn nfp-save cur-nfp))
767 (move ocfp-pass cfp-tn t))
770 '(move cfp-tn new-fp)
771 '(if (> nargs register-arg-count)
773 (move cfp-tn csp-tn)))
774 (trace-table-entry trace-table-call-site))))
780 (descriptor-reg (move name-pass name))
782 (inst lw name-pass cfp-tn
783 (ash (tn-offset name) word-shift))
786 (inst lw name-pass code-tn
787 (- (ash (tn-offset name) word-shift)
788 other-pointer-lowtag))
790 (inst lw entry-point name-pass
791 (- (ash fdefn-raw-addr-slot word-shift)
792 other-pointer-lowtag))
795 (descriptor-reg (move lexenv arg-fun))
797 (inst lw lexenv cfp-tn
798 (ash (tn-offset arg-fun) word-shift))
801 (inst lw lexenv code-tn
802 (- (ash (tn-offset arg-fun) word-shift)
803 other-pointer-lowtag))
805 (inst lw function lexenv
806 (- (ash closure-fun-slot word-shift)
809 (inst addu entry-point function
810 (- (ash simple-fun-code-offset word-shift)
811 fun-pointer-lowtag))))
818 (note-this-location vop :call-site)
824 '((trace-table-entry trace-table-normal)
825 (emit-return-pc lra-label)
826 (default-unknown-values vop values nvals
827 move-temp temp lra-label)
829 (load-stack-tn cur-nfp nfp-save))))
831 '((trace-table-entry trace-table-normal)
832 (emit-return-pc lra-label)
833 (note-this-location vop :unknown-return)
834 (receive-unknown-values values-start nvals start count
837 (load-stack-tn cur-nfp nfp-save))))
841 (define-full-call call nil :fixed nil)
842 (define-full-call call-named t :fixed nil)
843 (define-full-call multiple-call nil :unknown nil)
844 (define-full-call multiple-call-named t :unknown nil)
845 (define-full-call tail-call nil :tail nil)
846 (define-full-call tail-call-named t :tail nil)
848 (define-full-call call-variable nil :fixed t)
849 (define-full-call multiple-call-variable nil :unknown t)
852 ;;; Defined separately, since needs special code that BLT's the arguments
855 (define-vop (tail-call-variable)
857 (args-arg :scs (any-reg) :target args)
858 (function-arg :scs (descriptor-reg) :target lexenv)
859 (ocfp-arg :scs (any-reg) :target ocfp)
860 (lra-arg :scs (descriptor-reg) :target lra))
862 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 0)) args)
863 (:temporary (:sc any-reg :offset lexenv-offset :from (:argument 1)) lexenv)
864 (:temporary (:sc any-reg :offset ocfp-offset :from (:argument 2)) ocfp)
865 (:temporary (:sc any-reg :offset lra-offset :from (:argument 3)) lra)
871 ;; Move these into the passing locations if they are not already there.
873 (move lexenv function-arg)
877 ;; Clear the number stack if anything is there and jump to the
878 ;; assembly-routine that does the bliting.
879 (inst j (make-fixup 'tail-call-variable :assembly-routine))
880 (let ((cur-nfp (current-nfp-tn vop)))
882 (inst addu nsp-tn cur-nfp
883 (bytes-needed-for-non-descriptor-stack-frame))
887 ;;;; Unknown values return:
889 ;;; Return a single value using the unknown-values convention.
891 (define-vop (return-single)
892 (:args (ocfp :scs (any-reg))
893 (return-pc :scs (descriptor-reg))
896 (:temporary (:scs (interior-reg)) lip)
899 ;; Clear the number stack.
900 (trace-table-entry trace-table-fun-epilogue)
901 (let ((cur-nfp (current-nfp-tn vop)))
903 (inst addu nsp-tn cur-nfp
904 (bytes-needed-for-non-descriptor-stack-frame))))
905 ;; Clear the control stack, and restore the frame pointer.
909 (lisp-return return-pc lip :offset 2)
910 (trace-table-entry trace-table-normal)))
913 ;;; Do unknown-values return of a fixed number of values. The Values are
914 ;;; required to be set up in the standard passing locations. Nvals is the
915 ;;; number of values returned.
917 ;;; If returning a single value, then deallocate the current frame, restore
918 ;;; FP and jump to the single-value entry at Return-PC + 8.
920 ;;; If returning other than one value, then load the number of values returned,
921 ;;; NIL out unsupplied values registers, restore FP and return at Return-PC.
922 ;;; When there are stack values, we must initialize the argument pointer to
923 ;;; point to the beginning of the values block (which is the beginning of the
927 (:args (ocfp :scs (any-reg))
928 (return-pc :scs (descriptor-reg) :to (:eval 1))
932 (:temporary (:sc descriptor-reg :offset a0-offset :from (:eval 0)) a0)
933 (:temporary (:sc descriptor-reg :offset a1-offset :from (:eval 0)) a1)
934 (:temporary (:sc descriptor-reg :offset a2-offset :from (:eval 0)) a2)
935 (:temporary (:sc descriptor-reg :offset a3-offset :from (:eval 0)) a3)
936 (:temporary (:sc descriptor-reg :offset a4-offset :from (:eval 0)) a4)
937 (:temporary (:sc descriptor-reg :offset a5-offset :from (:eval 0)) a5)
938 (:temporary (:sc any-reg :offset nargs-offset) nargs)
939 (:temporary (:sc any-reg :offset ocfp-offset) val-ptr)
940 (:temporary (:scs (interior-reg)) lip)
943 ;; Clear the number stack.
944 (trace-table-entry trace-table-fun-epilogue)
945 (let ((cur-nfp (current-nfp-tn vop)))
947 (inst addu nsp-tn cur-nfp
948 (bytes-needed-for-non-descriptor-stack-frame))))
949 ;; Establish the values pointer and values count.
950 (move val-ptr cfp-tn)
951 (inst li nargs (fixnumize nvals))
952 ;; restore the frame pointer and clear as much of the control
953 ;; stack as possible.
955 (inst addu csp-tn val-ptr (* nvals n-word-bytes))
956 ;; pre-default any argument register that need it.
957 (when (< nvals register-arg-count)
958 (dolist (reg (subseq (list a0 a1 a2 a3 a4 a5) nvals))
961 (lisp-return return-pc lip)
962 (trace-table-entry trace-table-normal)))
964 ;;; Do unknown-values return of an arbitrary number of values (passed on the
965 ;;; stack.) We check for the common case of a single return value, and do that
966 ;;; inline using the normal single value return convention. Otherwise, we
967 ;;; branch off to code that calls an assembly-routine.
969 (define-vop (return-multiple)
970 (:args (ocfp-arg :scs (any-reg) :target ocfp)
971 (lra-arg :scs (descriptor-reg) :target lra)
972 (vals-arg :scs (any-reg) :target vals)
973 (nvals-arg :scs (any-reg) :target nvals))
975 (:temporary (:sc any-reg :offset nl1-offset :from (:argument 0)) ocfp)
976 (:temporary (:sc descriptor-reg :offset lra-offset :from (:argument 1)) lra)
977 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 2)) vals)
978 (:temporary (:sc any-reg :offset nargs-offset :from (:argument 3)) nvals)
979 (:temporary (:sc descriptor-reg :offset a0-offset) a0)
980 (:temporary (:scs (interior-reg)) lip)
985 (trace-table-entry trace-table-fun-epilogue)
986 (let ((not-single (gen-label)))
987 ;; Clear the number stack.
988 (let ((cur-nfp (current-nfp-tn vop)))
990 (inst addu nsp-tn cur-nfp
991 (bytes-needed-for-non-descriptor-stack-frame))))
993 ;; Check for the single case.
994 (inst li a0 (fixnumize 1))
995 (inst bne nvals-arg a0 not-single)
996 (inst lw a0 vals-arg)
998 ;; Return with one value.
1000 (move cfp-tn ocfp-arg)
1001 (lisp-return lra-arg lip :offset 2)
1003 ;; Nope, not the single case.
1004 (emit-label not-single)
1005 (move ocfp ocfp-arg)
1007 (move vals vals-arg)
1009 (inst j (make-fixup 'return-multiple :assembly-routine))
1010 (move nvals nvals-arg t))
1011 (trace-table-entry trace-table-normal)))
1018 ;;; We don't need to do anything special for regular functions.
1020 (define-vop (setup-environment)
1024 ;; Don't bother doing anything.
1027 ;;; Get the lexical environment from its passing location.
1029 (define-vop (setup-closure-environment)
1030 (:temporary (:sc descriptor-reg :offset lexenv-offset :target closure
1033 (:results (closure :scs (descriptor-reg)))
1038 (move closure lexenv)))
1040 ;;; Copy a more arg from the argument area to the end of the current frame.
1041 ;;; Fixed is the number of non-more arguments.
1043 (define-vop (copy-more-arg)
1044 (:temporary (:sc any-reg :offset nl0-offset) result)
1045 (:temporary (:sc any-reg :offset nl1-offset) count)
1046 (:temporary (:sc any-reg :offset nl2-offset) src)
1047 (:temporary (:sc any-reg :offset nl3-offset) dst)
1048 (:temporary (:sc descriptor-reg :offset l0-offset) temp)
1051 (let ((loop (gen-label))
1052 (do-regs (gen-label))
1054 (when (< fixed register-arg-count)
1055 ;; Save a pointer to the results so we can fill in register args.
1056 ;; We don't need this if there are more fixed args than reg args.
1057 (move result csp-tn))
1058 ;; Allocate the space on the stack.
1059 (cond ((zerop fixed)
1060 (inst beq nargs-tn done)
1061 (inst addu csp-tn csp-tn nargs-tn))
1063 (inst addu count nargs-tn (fixnumize (- fixed)))
1064 (inst blez count done)
1066 (inst addu csp-tn csp-tn count)))
1067 (when (< fixed register-arg-count)
1068 ;; We must stop when we run out of stack args, not when we run out of
1070 (inst addu count nargs-tn (fixnumize (- register-arg-count))))
1071 ;; Everything of interest in registers.
1072 (inst blez count do-regs)
1073 ;; Initialize dst to be end of stack.
1075 ;; Initialize src to be end of args.
1076 (inst addu src cfp-tn nargs-tn)
1079 ;; *--dst = *--src, --count
1080 (inst addu src src (- n-word-bytes))
1081 (inst addu count count (fixnumize -1))
1083 (inst addu dst dst (- n-word-bytes))
1084 (inst bgtz count loop)
1087 (emit-label do-regs)
1088 (when (< fixed register-arg-count)
1089 ;; Now we have to deposit any more args that showed up in registers.
1090 ;; We know there is at least one more arg, otherwise we would have
1091 ;; branched to done up at the top.
1092 (inst subu count nargs-tn (fixnumize (1+ fixed)))
1093 (do ((i fixed (1+ i)))
1094 ((>= i register-arg-count))
1095 ;; Is this the last one?
1096 (inst beq count done)
1097 ;; Store it relative to the pointer saved at the start.
1098 (storew (nth i *register-arg-tns*) result (- i fixed))
1100 (inst subu count (fixnumize 1))))
1101 (emit-label done))))
1104 ;;; More args are stored consequtively on the stack, starting immediately at
1105 ;;; the context pointer. The context pointer is not typed, so the lowtag is 0.
1107 (define-full-reffer more-arg * 0 0 (descriptor-reg any-reg) * %more-arg)
1110 ;;; Turn more arg (context, count) into a list.
1112 (define-vop (listify-rest-args)
1113 (:args (context-arg :target context :scs (descriptor-reg))
1114 (count-arg :target count :scs (any-reg)))
1115 (:arg-types * tagged-num)
1116 (:temporary (:scs (any-reg) :from (:argument 0)) context)
1117 (:temporary (:scs (any-reg) :from (:argument 1)) count)
1118 (:temporary (:scs (descriptor-reg) :from :eval) temp dst)
1119 (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
1120 (:results (result :scs (descriptor-reg)))
1121 (:translate %listify-rest-args)
1124 (let ((enter (gen-label))
1127 (move context context-arg)
1128 (move count count-arg)
1129 ;; Check to see if there are any arguments.
1130 (inst beq count zero-tn done)
1131 (move result null-tn t)
1133 ;; We need to do this atomically.
1134 (pseudo-atomic (pa-flag)
1135 ;; Allocate a cons (2 words) for each item.
1136 (inst or result alloc-tn list-pointer-lowtag)
1138 (inst sll temp count 1)
1140 (inst addu alloc-tn alloc-tn temp)
1142 ;; Store the current cons in the cdr of the previous cons.
1144 (inst addu dst dst (* 2 n-word-bytes))
1145 (storew dst dst -1 list-pointer-lowtag)
1149 (loadw temp context)
1150 (inst addu context context n-word-bytes)
1152 ;; Dec count, and if != zero, go back for more.
1153 (inst addu count count (fixnumize -1))
1154 (inst bne count zero-tn loop)
1156 ;; Store the value in the car (in delay slot)
1157 (storew temp dst 0 list-pointer-lowtag)
1159 ;; NIL out the last cons.
1160 (storew null-tn dst 1 list-pointer-lowtag))
1161 (emit-label done))))
1163 ;;; Return the location and size of the more arg glob created by Copy-More-Arg.
1164 ;;; Supplied is the total number of arguments supplied (originally passed in
1165 ;;; NARGS.) Fixed is the number of non-rest arguments.
1167 ;;; We must duplicate some of the work done by Copy-More-Arg, since at that
1168 ;;; time the environment is in a pretty brain-damaged state, preventing this
1169 ;;; info from being returned as values. What we do is compute
1170 ;;; supplied - fixed, and return a pointer that many words below the current
1173 (define-vop (more-arg-context)
1174 (:policy :fast-safe)
1175 (:translate sb!c::%more-arg-context)
1176 (:args (supplied :scs (any-reg)))
1177 (:arg-types tagged-num (:constant fixnum))
1179 (:results (context :scs (descriptor-reg))
1180 (count :scs (any-reg)))
1181 (:result-types t tagged-num)
1182 (:note "more-arg-context")
1184 (inst addu count supplied (fixnumize (- fixed)))
1185 (inst subu context csp-tn count)))
1188 ;;; Signal wrong argument count error if Nargs isn't = to Count.
1190 (define-vop (verify-arg-count)
1191 (:policy :fast-safe)
1192 (:translate sb!c::%verify-arg-count)
1193 (:args (nargs :scs (any-reg)))
1194 (:arg-types positive-fixnum (:constant t))
1195 (:temporary (:scs (any-reg) :type fixnum) temp)
1198 (:save-p :compute-only)
1201 (generate-error-code vop invalid-arg-count-error nargs)))
1202 (cond ((zerop count)
1203 (inst bne nargs zero-tn err-lab)
1206 (inst li temp (fixnumize count))
1207 (inst bne nargs temp err-lab)
1210 ;;; Various other error signalers.
1212 (macrolet ((frob (name error translate &rest args)
1213 `(define-vop (,name)
1215 `((:policy :fast-safe)
1216 (:translate ,translate)))
1217 (:args ,@(mapcar #'(lambda (arg)
1218 `(,arg :scs (any-reg descriptor-reg)))
1221 (:save-p :compute-only)
1223 (error-call vop ,error ,@args)))))
1224 (frob arg-count-error invalid-arg-count-error
1225 sb!c::%arg-count-error nargs)
1226 (frob type-check-error object-not-type-error sb!c::%type-check-error
1228 (frob layout-invalid-error layout-invalid-error sb!c::%layout-invalid-error
1230 (frob odd-key-args-error odd-key-args-error
1231 sb!c::%odd-key-args-error)
1232 (frob unknown-key-arg-error unknown-key-arg-error
1233 sb!c::%unknown-key-arg-error key)
1234 (frob nil-fun-returned-error nil-fun-returned-error nil fun))