1 ;;;; the VM definition of function call for the PPC
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* register-arg-scn
22 (elt *register-arg-offsets* n))
23 (make-wired-tn *backend-t-primitive-type* control-stack-arg-scn n)))
26 ;;; Make a passing location TN for a local call return PC. If
27 ;;; standard is true, then use the standard (full call) location,
28 ;;; otherwise use any legal location. Even in the non-standard case,
29 ;;; this may be restricted by a desire to use a subroutine call
31 (!def-vm-support-routine make-return-pc-passing-location (standard)
33 (make-wired-tn *backend-t-primitive-type* register-arg-scn lra-offset)
34 (make-restricted-tn *backend-t-primitive-type* register-arg-scn)))
36 ;;; This is similar to MAKE-RETURN-PC-PASSING-LOCATION, but makes a
37 ;;; location to pass OLD-FP in. This is (obviously) wired in the
38 ;;; standard convention, but is totally unrestricted in non-standard
39 ;;; conventions, since we can always fetch it off of the stack using
41 (!def-vm-support-routine make-old-fp-passing-location (standard)
43 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn ocfp-offset)
44 (make-normal-tn *fixnum-primitive-type*)))
46 ;;; Make the TNs used to hold OLD-FP and RETURN-PC within the current
47 ;;; function. We treat these specially so that the debugger can find
48 ;;; them at a known location.
49 (!def-vm-support-routine make-old-fp-save-location (env)
51 (physenv-debug-live-tn (make-normal-tn *fixnum-primitive-type*) env)
52 (make-wired-tn *fixnum-primitive-type*
55 (!def-vm-support-routine make-return-pc-save-location (env)
57 (physenv-debug-live-tn (make-normal-tn *backend-t-primitive-type*) env)
58 (make-wired-tn *backend-t-primitive-type*
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 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*)))
87 ;;; This function is called by the ENTRY-ANALYZE phase, allowing
88 ;;; VM-dependent initialization of the IR2-COMPONENT structure. We push
89 ;;; placeholder entries in the Constants to leave room for additional
90 ;;; noise in the code object header.
91 (!def-vm-support-routine select-component-format (component)
92 (declare (type component component))
93 (dotimes (i code-constants-offset)
94 (vector-push-extend nil
95 (ir2-component-constants (component-info component))))
100 ;;; this is the first function in this file that differs materially from
101 ;;; ../alpha/call.lisp
102 (defun bytes-needed-for-non-descriptor-stack-frame ()
103 (logandc2 (+ +stack-alignment-bytes+ number-stack-displacement
104 (* (sb-allocated-size 'non-descriptor-stack) n-word-bytes))
105 +stack-alignment-bytes+))
108 ;;; Used for setting up the Old-FP in local call.
109 (define-vop (current-fp)
110 (:results (val :scs (any-reg)))
114 ;;; Used for computing the caller's NFP for use in known-values return. Only
115 ;;; works assuming there is no variable size stuff on the nstack.
116 (define-vop (compute-old-nfp)
117 (:results (val :scs (any-reg)))
120 (let ((nfp (current-nfp-tn vop)))
122 (inst addi val nfp (bytes-needed-for-non-descriptor-stack-frame))))))
124 (define-vop (xep-allocate-frame)
125 (:info start-lab copy-more-arg-follows)
126 (:ignore copy-more-arg-follows)
128 (:temporary (:scs (non-descriptor-reg)) temp)
130 ;; Make sure the function is aligned, and drop a label pointing to this
132 (align n-lowtag-bits)
133 (trace-table-entry trace-table-fun-prologue)
134 (emit-label start-lab)
135 ;; Allocate function header.
136 (inst simple-fun-header-word)
137 (dotimes (i (1- simple-fun-code-offset))
139 (let* ((entry-point (gen-label)))
140 (emit-label entry-point)
141 (inst compute-code-from-fn code-tn lip-tn entry-point temp))
142 ;; FIXME alpha port has a ### note here saying we should "save it
143 ;; on the stack" so that GC sees it. No idea what "it" is -dan 20020110
144 ;; Build our stack frames.
145 (inst addi csp-tn cfp-tn
146 (* n-word-bytes (sb-allocated-size 'control-stack)))
147 (let ((nfp-tn (current-nfp-tn vop)))
149 (let* ((nbytes (bytes-needed-for-non-descriptor-stack-frame)))
150 (when (> nbytes number-stack-displacement)
151 (inst stwu nsp-tn nsp-tn (- nbytes))
152 (inst addi nfp-tn nsp-tn number-stack-displacement)))))
153 (trace-table-entry trace-table-normal)))
155 (define-vop (allocate-frame)
156 (:results (res :scs (any-reg))
157 (nfp :scs (any-reg)))
160 (trace-table-entry trace-table-fun-prologue)
162 (inst addi csp-tn csp-tn
163 (* n-word-bytes (sb-allocated-size 'control-stack)))
164 (when (ir2-physenv-number-stack-p callee)
165 (let* ((nbytes (bytes-needed-for-non-descriptor-stack-frame)))
166 (when (> nbytes number-stack-displacement)
167 (inst stwu nsp-tn nsp-tn (- (bytes-needed-for-non-descriptor-stack-frame)))
168 (inst addi nfp nsp-tn number-stack-displacement))))
169 (trace-table-entry trace-table-normal)))
171 ;;; Allocate a partial frame for passing stack arguments in a full call. Nargs
172 ;;; is the number of arguments passed. If no stack arguments are passed, then
173 ;;; we don't have to do anything.
174 (define-vop (allocate-full-call-frame)
176 (:results (res :scs (any-reg)))
178 (when (> nargs register-arg-count)
180 (inst addi csp-tn csp-tn (* nargs n-word-bytes)))))
182 ;;; Emit code needed at the return-point from an unknown-values call
183 ;;; for a fixed number of values. Values is the head of the TN-REF
184 ;;; list for the locations that the values are to be received into.
185 ;;; Nvals is the number of values that are to be received (should
186 ;;; equal the length of Values).
188 ;;; MOVE-TEMP is a DESCRIPTOR-REG TN used as a temporary.
190 ;;; This code exploits the fact that in the unknown-values convention,
191 ;;; a single value return returns at the return PC + 8, whereas a
192 ;;; return of other than one value returns directly at the return PC.
194 ;;; If 0 or 1 values are expected, then we just emit an instruction to
195 ;;; reset the SP (which will only be executed when other than 1 value
198 ;;; In the general case, we have to do three things:
199 ;;; -- Default unsupplied register values. This need only be done when a
200 ;;; single value is returned, since register values are defaulted by the
201 ;;; callee in the non-single case.
202 ;;; -- Default unsupplied stack values. This needs to be done whenever there
203 ;;; are stack values.
204 ;;; -- Reset SP. This must be done whenever other than 1 value is returned,
205 ;;; regardless of the number of values desired.
207 ;;; The general-case code looks like this:
209 b regs-defaulted ; Skip if MVs
212 move a1 null-tn ; Default register values
214 loadi nargs 1 ; Force defaulting of stack values
215 move old-fp csp ; Set up args for SP resetting
218 subcc temp nargs register-arg-count
220 b :lt default-value-7 ; jump to default code
221 loadw move-temp ocfp-tn 6 ; Move value to correct location.
223 store-stack-tn val4-tn move-temp
225 b :lt default-value-8
226 loadw move-temp ocfp-tn 7
228 store-stack-tn val5-tn move-temp
233 move csp ocfp ; Reset SP.
238 store-stack-tn val4-tn null-tn ; Nil out 7'th value. (first on stack)
241 store-stack-tn val5-tn null-tn ; Nil out 8'th value.
248 ;;; differences from alpha: (1) alpha tests for lra-label before
249 ;;; compute-code-from-lra and skips if nil. (2) loop termination is
250 ;;; different when clearing stack defaults
252 (defun default-unknown-values (vop values nvals move-temp temp lra-label)
253 (declare (type (or tn-ref null) values)
254 (type unsigned-byte nvals) (type tn move-temp temp))
257 (sb!assem:without-scheduling ()
258 (note-this-location vop :single-value-return)
259 (move csp-tn ocfp-tn)
261 (inst compute-code-from-lra code-tn code-tn lra-label temp))
262 (let ((regs-defaulted (gen-label))
263 (defaulting-done (gen-label))
264 (default-stack-vals (gen-label)))
265 ;; Branch off to the MV case.
266 (sb!assem:without-scheduling ()
267 (note-this-location vop :unknown-return)
268 (if (> nvals register-arg-count)
269 (inst addic. temp nargs-tn (- (fixnumize register-arg-count)))
270 (move csp-tn ocfp-tn))
271 (inst b regs-defaulted))
273 ;; Do the single value case.
275 (val (tn-ref-across values) (tn-ref-across val)))
276 ((= i (min nvals register-arg-count)))
277 (move (tn-ref-tn val) null-tn))
278 (when (> nvals register-arg-count)
279 (move ocfp-tn csp-tn)
280 (inst b default-stack-vals))
282 (emit-label regs-defaulted)
283 (when (> nvals register-arg-count)
284 (collect ((defaults))
285 (do ((i register-arg-count (1+ i))
286 (val (do ((i 0 (1+ i))
287 (val values (tn-ref-across val)))
288 ((= i register-arg-count) val))
289 (tn-ref-across val)))
292 (let ((default-lab (gen-label))
293 (tn (tn-ref-tn val)))
294 (defaults (cons default-lab tn))
296 (inst lwz move-temp ocfp-tn (* i n-word-bytes))
297 (inst ble default-lab)
298 (inst addic. temp temp (- (fixnumize 1)))
299 (store-stack-tn tn move-temp)))
301 (emit-label defaulting-done)
302 (move csp-tn ocfp-tn)
304 (let ((defaults (defaults)))
306 (assemble (*elsewhere*)
307 (emit-label default-stack-vals)
308 (trace-table-entry trace-table-fun-prologue)
309 (do ((remaining defaults (cdr remaining)))
311 (let ((def (car remaining)))
312 (emit-label (car def))
313 (store-stack-tn (cdr def) null-tn)))
314 (inst b defaulting-done)
315 (trace-table-entry trace-table-normal))))))
317 (inst compute-code-from-lra code-tn code-tn lra-label temp)))
321 ;;;; Unknown values receiving:
323 ;;; Emit code needed at the return point for an unknown-values call for an
324 ;;; arbitrary number of values.
326 ;;; We do the single and non-single cases with no shared code: there doesn't
327 ;;; seem to be any potential overlap, and receiving a single value is more
328 ;;; important efficiency-wise.
330 ;;; When there is a single value, we just push it on the stack, returning
331 ;;; the old SP and 1.
333 ;;; When there is a variable number of values, we move all of the argument
334 ;;; registers onto the stack, and return Args and Nargs.
336 ;;; Args and Nargs are TNs wired to the named locations. We must
337 ;;; explicitly allocate these TNs, since their lifetimes overlap with the
338 ;;; results Start and Count (also, it's nice to be able to target them).
339 (defun receive-unknown-values (args nargs start count lra-label temp)
340 (declare (type tn args nargs start count temp))
341 (let ((variable-values (gen-label))
343 (sb!assem:without-scheduling ()
344 (inst b variable-values)
347 (inst compute-code-from-lra code-tn code-tn lra-label temp)
348 (inst addi csp-tn csp-tn 4)
349 (storew (first *register-arg-tns*) csp-tn -1)
350 (inst subi start csp-tn 4)
351 (inst li count (fixnumize 1))
355 (assemble (*elsewhere*)
356 (trace-table-entry trace-table-fun-prologue)
357 (emit-label variable-values)
358 (inst compute-code-from-lra code-tn code-tn lra-label temp)
359 (do ((arg *register-arg-tns* (rest arg))
362 (storew (first arg) args i))
366 (trace-table-entry trace-table-normal)))
370 ;;; VOP that can be inherited by unknown values receivers. The main
371 ;;; thing this handles is allocation of the result temporaries.
372 (define-vop (unknown-values-receiver)
374 (start :scs (any-reg))
375 (count :scs (any-reg)))
376 (:temporary (:sc descriptor-reg :offset ocfp-offset
377 :from :eval :to (:result 0))
379 (:temporary (:sc any-reg :offset nargs-offset
380 :from :eval :to (:result 1))
382 (:temporary (:scs (non-descriptor-reg)) temp))
386 ;;;; Local call with unknown values convention return:
388 ;;; Non-TR local call for a fixed number of values passed according to the
389 ;;; unknown values convention.
391 ;;; Args are the argument passing locations, which are specified only to
392 ;;; terminate their lifetimes in the caller.
394 ;;; Values are the return value locations (wired to the standard passing
397 ;;; Save is the save info, which we can ignore since saving has been done.
398 ;;; Return-PC is the TN that the return PC should be passed in.
399 ;;; Target is a continuation pointing to the start of the called function.
400 ;;; Nvals is the number of values received.
402 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
403 ;;; registers may be tied up by the more operand. Instead, we use
404 ;;; MAYBE-LOAD-STACK-TN.
405 (define-vop (call-local)
409 (:results (values :more t))
411 (:move-args :local-call)
412 (:info arg-locs callee target nvals)
414 (:temporary (:scs (descriptor-reg) :from (:eval 0)) move-temp)
415 (:temporary (:scs (non-descriptor-reg)) temp)
416 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
417 (:temporary (:sc any-reg :offset ocfp-offset :from (:eval 0)) ocfp)
418 (:ignore arg-locs args ocfp)
420 (trace-table-entry trace-table-call-site)
421 (let ((label (gen-label))
422 (cur-nfp (current-nfp-tn vop)))
424 (store-stack-tn nfp-save cur-nfp))
425 (let ((callee-nfp (callee-nfp-tn callee)))
427 (maybe-load-stack-tn callee-nfp nfp)))
428 (maybe-load-stack-tn cfp-tn fp)
429 (inst compute-lra-from-code
430 (callee-return-pc-tn callee) code-tn label temp)
431 (note-this-location vop :call-site)
433 (emit-return-pc label)
434 (default-unknown-values vop values nvals move-temp temp label)
435 ;; alpha uses (maybe-load-stack-nfp-tn cur-nfp nfp-save temp)
436 ;; instead of the clause below
438 (load-stack-tn cur-nfp nfp-save)))
439 (trace-table-entry trace-table-normal)))
442 ;;; Non-TR local call for a variable number of return values passed according
443 ;;; to the unknown values convention. The results are the start of the values
444 ;;; glob and the number of values received.
446 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
447 ;;; registers may be tied up by the more operand. Instead, we use
448 ;;; MAYBE-LOAD-STACK-TN.
449 (define-vop (multiple-call-local unknown-values-receiver)
454 (:move-args :local-call)
455 (:info save callee target)
458 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
459 (:temporary (:scs (non-descriptor-reg)) temp)
461 (trace-table-entry trace-table-call-site)
462 (let ((label (gen-label))
463 (cur-nfp (current-nfp-tn vop)))
465 (store-stack-tn nfp-save cur-nfp))
466 (let ((callee-nfp (callee-nfp-tn callee)))
467 ;; alpha doesn't test this before the maybe-load
469 (maybe-load-stack-tn callee-nfp nfp)))
470 (maybe-load-stack-tn cfp-tn fp)
471 (inst compute-lra-from-code
472 (callee-return-pc-tn callee) code-tn label temp)
473 (note-this-location vop :call-site)
475 (emit-return-pc label)
476 (note-this-location vop :unknown-return)
477 (receive-unknown-values values-start nvals start count label temp)
479 (load-stack-tn cur-nfp nfp-save)))
480 (trace-table-entry trace-table-normal)))
483 ;;;; Local call with known values return:
485 ;;; Non-TR local call with known return locations. Known-value return works
486 ;;; just like argument passing in local call.
488 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
489 ;;; registers may be tied up by the more operand. Instead, we use
490 ;;; MAYBE-LOAD-STACK-TN.
491 (define-vop (known-call-local)
495 (:results (res :more t))
496 (:move-args :local-call)
498 (:info save callee target)
499 (:ignore args res save)
501 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
502 (:temporary (:scs (non-descriptor-reg)) temp)
504 (trace-table-entry trace-table-call-site)
505 (let ((label (gen-label))
506 (cur-nfp (current-nfp-tn vop)))
508 (store-stack-tn nfp-save cur-nfp))
509 (let ((callee-nfp (callee-nfp-tn callee)))
511 (maybe-load-stack-tn callee-nfp nfp)))
512 (maybe-load-stack-tn cfp-tn fp)
513 (inst compute-lra-from-code
514 (callee-return-pc-tn callee) code-tn label temp)
515 (note-this-location vop :call-site)
517 (emit-return-pc label)
518 (note-this-location vop :known-return)
520 (load-stack-tn cur-nfp nfp-save)))
521 (trace-table-entry trace-table-normal)))
523 ;;; Return from known values call. We receive the return locations as
524 ;;; arguments to terminate their lifetimes in the returning function. We
525 ;;; restore FP and CSP and jump to the Return-PC.
527 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
528 ;;; registers may be tied up by the more operand. Instead, we use
529 ;;; MAYBE-LOAD-STACK-TN.
530 (define-vop (known-return)
531 (:args (old-fp :target old-fp-temp)
532 (return-pc :target return-pc-temp)
534 (:temporary (:sc any-reg :from (:argument 0)) old-fp-temp)
535 (:temporary (:sc descriptor-reg :from (:argument 1)) return-pc-temp)
536 (:move-args :known-return)
538 (:ignore val-locs vals)
541 (trace-table-entry trace-table-fun-epilogue)
542 (maybe-load-stack-tn old-fp-temp old-fp)
543 (maybe-load-stack-tn return-pc-temp return-pc)
545 (let ((cur-nfp (current-nfp-tn vop)))
547 (inst addi nsp-tn cur-nfp
548 (- (bytes-needed-for-non-descriptor-stack-frame)
549 number-stack-displacement))))
550 (move cfp-tn old-fp-temp)
551 (inst j return-pc-temp (- n-word-bytes other-pointer-lowtag))
552 (trace-table-entry trace-table-normal)))
557 ;;; There is something of a cross-product effect with full calls. Different
558 ;;; versions are used depending on whether we know the number of arguments or
559 ;;; the name of the called function, and whether we want fixed values, unknown
560 ;;; values, or a tail call.
562 ;;; In full call, the arguments are passed creating a partial frame on the
563 ;;; stack top and storing stack arguments into that frame. On entry to the
564 ;;; callee, this partial frame is pointed to by FP. If there are no stack
565 ;;; arguments, we don't bother allocating a partial frame, and instead set FP
566 ;;; to SP just before the call.
568 ;;; This macro helps in the definition of full call VOPs by avoiding code
569 ;;; replication in defining the cross-product VOPs.
571 ;;; NAME is the name of the VOP to define.
573 ;;; NAMED is true if the first argument is a symbol whose global function
574 ;;; definition is to be called.
576 ;;; RETURN is either :FIXED, :UNKNOWN or :TAIL:
577 ;;; -- If :FIXED, then the call is for a fixed number of values, returned in
578 ;;; the standard passing locations (passed as result operands).
579 ;;; -- If :UNKNOWN, then the result values are pushed on the stack, and the
580 ;;; result values are specified by the Start and Count as in the
581 ;;; unknown-values continuation representation.
582 ;;; -- If :TAIL, then do a tail-recursive call. No values are returned.
583 ;;; The Old-Fp and Return-PC are passed as the second and third arguments.
585 ;;; In non-tail calls, the pointer to the stack arguments is passed as the last
586 ;;; fixed argument. If VARIABLE is false, then the passing locations are
587 ;;; passed as a more arg. VARIABLE is true if there are a variable number of
588 ;;; arguments passed on the stack. VARIABLE cannot be specified with :TAIL
589 ;;; return. TR variable argument call is implemented separately.
591 ;;; In tail call with fixed arguments, the passing locations are passed as a
592 ;;; more arg, but there is no new-FP, since the arguments have been set up in
593 ;;; the current frame.
594 (defmacro define-full-call (name named return variable)
595 (aver (not (and variable (eq return :tail))))
597 ,@(when (eq return :unknown)
598 '(unknown-values-receiver)))
600 ,@(unless (eq return :tail)
601 '((new-fp :scs (any-reg) :to :eval)))
604 '(name :target name-pass)
605 '(arg-fun :target lexenv))
607 ,@(when (eq return :tail)
608 '((old-fp :target old-fp-pass)
609 (return-pc :target return-pc-pass)))
611 ,@(unless variable '((args :more t :scs (descriptor-reg)))))
613 ,@(when (eq return :fixed)
614 '((:results (values :more t))))
616 (:save-p ,(if (eq return :tail) :compute-only t))
618 ,@(unless (or (eq return :tail) variable)
619 '((:move-args :full-call)))
622 (:info ,@(unless (or variable (eq return :tail)) '(arg-locs))
623 ,@(unless variable '(nargs))
624 ,@(when (eq return :fixed) '(nvals)))
627 ,@(unless (or variable (eq return :tail)) '(arg-locs))
628 ,@(unless variable '(args)))
630 (:temporary (:sc descriptor-reg
633 ,@(unless (eq return :fixed)
637 (:temporary (:sc descriptor-reg
639 :from (:argument ,(if (eq return :tail) 2 1))
644 `(:temporary (:sc descriptor-reg :offset fdefn-offset ; -dan
645 :from (:argument ,(if (eq return :tail) 0 1))
648 `(:temporary (:sc descriptor-reg :offset lexenv-offset
649 :from (:argument ,(if (eq return :tail) 0 1))
653 '((:temporary (:scs (descriptor-reg) :from (:argument 0) :to :eval)
655 (:temporary (:sc any-reg :offset nargs-offset :to :eval)
659 (mapcar #'(lambda (name offset)
660 `(:temporary (:sc descriptor-reg
664 register-arg-names *register-arg-offsets*))
665 ,@(when (eq return :fixed)
666 '((:temporary (:scs (descriptor-reg) :from :eval) move-temp)))
668 ,@(unless (eq return :tail)
669 '((:temporary (:scs (non-descriptor-reg)) temp)
670 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)))
672 (:temporary (:sc interior-reg :offset lip-offset) entry-point)
674 (:generator ,(+ (if named 5 0)
676 (if (eq return :tail) 0 10)
678 (if (eq return :unknown) 25 0))
679 (trace-table-entry trace-table-call-site)
680 (let* ((cur-nfp (current-nfp-tn vop))
681 ,@(unless (eq return :tail)
682 '((lra-label (gen-label))))
686 ,@(if (eq return :tail)
687 '((unless (location= old-fp old-fp-pass)
689 (unless (location= return-pc
699 (flet ((do-next-filler ()
700 (let* ((next (pop filler))
701 (what (if (consp next) (car next) next)))
705 `((inst sub nargs-pass csp-tn new-fp)
707 (mapcar #'(lambda (name)
710 register-arg-names)))
711 '((inst lr nargs-pass (fixnumize nargs)))))
712 ,@(if (eq return :tail)
716 (inst mr old-fp-pass old-fp))
718 (loadw old-fp-pass cfp-tn
719 (tn-offset old-fp)))))
723 (inst mr return-pc-pass return-pc))
725 (loadw return-pc-pass cfp-tn
726 (tn-offset return-pc)))))
728 (inst addi nsp-tn cur-nfp
729 (- (bytes-needed-for-non-descriptor-stack-frame)
730 number-stack-displacement))))
732 (inst compute-lra-from-code
733 return-pc-pass code-tn lra-label temp))
735 (store-stack-tn nfp-save cur-nfp))
737 (inst mr old-fp-pass cfp-tn))
740 '(move cfp-tn new-fp)
741 '(if (> nargs register-arg-count)
743 (move cfp-tn csp-tn))))))
747 (descriptor-reg (move name-pass name))
749 (loadw name-pass cfp-tn (tn-offset name))
752 (loadw name-pass code-tn (tn-offset name)
753 other-pointer-lowtag)
755 (loadw entry-point name-pass fdefn-raw-addr-slot
756 other-pointer-lowtag)
759 (descriptor-reg (move lexenv arg-fun))
761 (loadw lexenv cfp-tn (tn-offset arg-fun))
764 (loadw lexenv code-tn (tn-offset arg-fun)
765 other-pointer-lowtag)
767 (loadw function lexenv closure-fun-slot
770 (inst addi entry-point function
771 (- (ash simple-fun-code-offset word-shift)
779 (note-this-location vop :call-site)
780 (inst mtctr entry-point)
781 ;; this following line is questionable. or else the alpha
782 ;; code (which doesn't do it) is questionable
783 ;; (inst mr code-tn function)
788 '((emit-return-pc lra-label)
789 (default-unknown-values vop values nvals move-temp
792 (load-stack-tn cur-nfp nfp-save))))
794 '((emit-return-pc lra-label)
795 (note-this-location vop :unknown-return)
796 (receive-unknown-values values-start nvals start count
799 (load-stack-tn cur-nfp nfp-save))))
801 (trace-table-entry trace-table-normal))))
804 (define-full-call call nil :fixed nil)
805 (define-full-call call-named t :fixed nil)
806 (define-full-call multiple-call nil :unknown nil)
807 (define-full-call multiple-call-named t :unknown nil)
808 (define-full-call tail-call nil :tail nil)
809 (define-full-call tail-call-named t :tail nil)
811 (define-full-call call-variable nil :fixed t)
812 (define-full-call multiple-call-variable nil :unknown t)
815 ;;; Defined separately, since needs special code that BLT's the
817 (define-vop (tail-call-variable)
819 (args-arg :scs (any-reg) :target args)
820 (function-arg :scs (descriptor-reg) :target lexenv)
821 (old-fp-arg :scs (any-reg) :target old-fp)
822 (lra-arg :scs (descriptor-reg) :target lra))
824 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 0)) args)
825 (:temporary (:sc any-reg :offset lexenv-offset :from (:argument 1)) lexenv)
826 (:temporary (:sc any-reg :offset ocfp-offset :from (:argument 2)) old-fp)
827 (:temporary (:sc any-reg :offset lra-offset :from (:argument 3)) lra)
834 ;; Move these into the passing locations if they are not already there.
836 (move lexenv function-arg)
837 (move old-fp old-fp-arg)
841 ;; Clear the number stack if anything is there.
842 (let ((cur-nfp (current-nfp-tn vop)))
844 (inst addi nsp-tn cur-nfp
845 (- (bytes-needed-for-non-descriptor-stack-frame)
846 number-stack-displacement))))
849 (inst ba (make-fixup 'tail-call-variable :assembly-routine))))
852 ;;;; Unknown values return:
854 ;;; Return a single value using the unknown-values convention.
855 (define-vop (return-single)
856 (:args (old-fp :scs (any-reg))
857 (return-pc :scs (descriptor-reg))
860 (:temporary (:scs (interior-reg)) lip)
863 (trace-table-entry trace-table-fun-epilogue)
864 ;; Clear the number stack.
865 (let ((cur-nfp (current-nfp-tn vop)))
867 (inst addi nsp-tn cur-nfp
868 (- (bytes-needed-for-non-descriptor-stack-frame)
869 number-stack-displacement))))
870 ;; Clear the control stack, and restore the frame pointer.
874 (lisp-return return-pc lip :offset 2)
875 (trace-table-entry trace-table-normal)))
877 ;;; Do unknown-values return of a fixed number of values. The Values are
878 ;;; required to be set up in the standard passing locations. Nvals is the
879 ;;; number of values returned.
881 ;;; If returning a single value, then deallocate the current frame, restore
882 ;;; FP and jump to the single-value entry at Return-PC + 8.
884 ;;; If returning other than one value, then load the number of values returned,
885 ;;; NIL out unsupplied values registers, restore FP and return at Return-PC.
886 ;;; When there are stack values, we must initialize the argument pointer to
887 ;;; point to the beginning of the values block (which is the beginning of the
891 (old-fp :scs (any-reg))
892 (return-pc :scs (descriptor-reg) :to (:eval 1))
896 (:temporary (:sc descriptor-reg :offset a0-offset :from (:eval 0)) a0)
897 (:temporary (:sc descriptor-reg :offset a1-offset :from (:eval 0)) a1)
898 (:temporary (:sc descriptor-reg :offset a2-offset :from (:eval 0)) a2)
899 (:temporary (:sc descriptor-reg :offset a3-offset :from (:eval 0)) a3)
900 (:temporary (:sc any-reg :offset nargs-offset) nargs)
901 (:temporary (:sc any-reg :offset ocfp-offset) val-ptr)
902 (:temporary (:scs (interior-reg)) lip)
905 (trace-table-entry trace-table-fun-epilogue)
906 ;; Clear the number stack.
907 (let ((cur-nfp (current-nfp-tn vop)))
909 (inst addi nsp-tn cur-nfp
910 (- (bytes-needed-for-non-descriptor-stack-frame)
911 number-stack-displacement))))
913 ;; Clear the control stack, and restore the frame pointer.
917 (lisp-return return-pc lip :offset 2))
919 ;; Establish the values pointer and values count.
920 (move val-ptr cfp-tn)
921 (inst lr nargs (fixnumize nvals))
922 ;; restore the frame pointer and clear as much of the control
923 ;; stack as possible.
925 (inst addi csp-tn val-ptr (* nvals n-word-bytes))
926 ;; pre-default any argument register that need it.
927 (when (< nvals register-arg-count)
928 (dolist (reg (subseq (list a0 a1 a2 a3) nvals))
931 (lisp-return return-pc lip)))
932 (trace-table-entry trace-table-normal)))
934 ;;; Do unknown-values return of an arbitrary number of values (passed
935 ;;; on the stack.) We check for the common case of a single return
936 ;;; value, and do that inline using the normal single value return
937 ;;; convention. Otherwise, we branch off to code that calls an
938 ;;; assembly-routine.
939 (define-vop (return-multiple)
941 (old-fp-arg :scs (any-reg) :to (:eval 1))
942 (lra-arg :scs (descriptor-reg) :to (:eval 1))
943 (vals-arg :scs (any-reg) :target vals)
944 (nvals-arg :scs (any-reg) :target nvals))
946 (:temporary (:sc any-reg :offset nl1-offset :from (:argument 0)) old-fp)
947 (:temporary (:sc descriptor-reg :offset lra-offset :from (:argument 1)) lra)
948 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 2)) vals)
949 (:temporary (:sc any-reg :offset nargs-offset :from (:argument 3)) nvals)
950 (:temporary (:sc descriptor-reg :offset a0-offset) a0)
951 (:temporary (:scs (interior-reg)) lip)
957 (trace-table-entry trace-table-fun-epilogue)
958 (let ((not-single (gen-label)))
959 ;; Clear the number stack.
960 (let ((cur-nfp (current-nfp-tn vop)))
962 (inst addi nsp-tn cur-nfp
963 (- (bytes-needed-for-non-descriptor-stack-frame)
964 number-stack-displacement))))
966 ;; Check for the single case.
967 (inst cmpwi nvals-arg (fixnumize 1))
968 (inst lwz a0 vals-arg 0)
969 (inst bne not-single)
971 ;; Return with one value.
973 (move cfp-tn old-fp-arg)
974 (lisp-return lra-arg lip :offset 2)
976 ;; Nope, not the single case.
977 (emit-label not-single)
978 (move old-fp old-fp-arg)
981 (move nvals nvals-arg)
982 (inst ba (make-fixup 'return-multiple :assembly-routine)))
983 (trace-table-entry trace-table-normal)))
987 ;;; We don't need to do anything special for regular functions.
988 (define-vop (setup-environment)
992 ;; Don't bother doing anything.
995 ;;; Get the lexical environment from its passing location.
996 (define-vop (setup-closure-environment)
997 (:temporary (:sc descriptor-reg :offset lexenv-offset :target closure
1000 (:results (closure :scs (descriptor-reg)))
1005 (move closure lexenv)))
1007 ;;; Copy a more arg from the argument area to the end of the current frame.
1008 ;;; Fixed is the number of non-more arguments.
1009 (define-vop (copy-more-arg)
1010 (:temporary (:sc any-reg :offset nl0-offset) result)
1011 (:temporary (:sc any-reg :offset nl1-offset) count)
1012 (:temporary (:sc any-reg :offset nl2-offset) src)
1013 (:temporary (:sc any-reg :offset nl3-offset) dst)
1014 (:temporary (:sc descriptor-reg :offset l0-offset) temp)
1017 (let ((loop (gen-label))
1018 (do-regs (gen-label))
1020 (when (< fixed register-arg-count)
1021 ;; Save a pointer to the results so we can fill in register args.
1022 ;; We don't need this if there are more fixed args than reg args.
1023 (move result csp-tn))
1024 ;; Allocate the space on the stack.
1025 (cond ((zerop fixed)
1026 (inst cmpwi nargs-tn 0)
1027 (inst add csp-tn csp-tn nargs-tn)
1030 (inst addic. count nargs-tn (- (fixnumize fixed)))
1032 (inst add csp-tn csp-tn count)))
1033 (when (< fixed register-arg-count)
1034 ;; We must stop when we run out of stack args, not when we run out of
1036 (inst addic. count nargs-tn (- (fixnumize register-arg-count)))
1037 ;; Everything of interest is in registers.
1039 ;; Initialize dst to be end of stack.
1041 ;; Initialize src to be end of args.
1042 (inst add src cfp-tn nargs-tn)
1045 ;; *--dst = *--src, --count
1046 (inst addi src src (- n-word-bytes))
1047 (inst addic. count count (- (fixnumize 1)))
1049 (inst addi dst dst (- n-word-bytes))
1053 (emit-label do-regs)
1054 (when (< fixed register-arg-count)
1055 ;; Now we have to deposit any more args that showed up in registers.
1056 (inst subic. count nargs-tn (fixnumize fixed))
1057 (do ((i fixed (1+ i)))
1058 ((>= i register-arg-count))
1059 ;; Don't deposit any more than there are.
1061 (inst subic. count count (fixnumize 1))
1062 ;; Store it relative to the pointer saved at the start.
1063 (storew (nth i *register-arg-tns*) result (- i fixed))))
1064 (emit-label done))))
1067 ;;; More args are stored consecutively on the stack, starting
1068 ;;; immediately at the context pointer. The context pointer is not
1069 ;;; typed, so the lowtag is 0.
1070 (define-vop (more-arg word-index-ref)
1072 (:translate %more-arg))
1074 ;;; Turn more arg (context, count) into a list.
1075 (defoptimizer (%listify-rest-args stack-allocate-result) ((&rest args))
1078 (define-vop (listify-rest-args)
1079 (:args (context-arg :target context :scs (descriptor-reg))
1080 (count-arg :target count :scs (any-reg)))
1081 (:arg-types * tagged-num)
1082 (:temporary (:scs (any-reg) :from (:argument 0)) context)
1083 (:temporary (:scs (any-reg) :from (:argument 1)) count)
1084 (:temporary (:scs (descriptor-reg) :from :eval) temp)
1085 (:temporary (:scs (non-descriptor-reg) :from :eval) dst)
1086 (:temporary (:sc non-descriptor-reg :offset nl3-offset) pa-flag)
1087 (:results (result :scs (descriptor-reg)))
1088 (:translate %listify-rest-args)
1092 (let* ((enter (gen-label))
1095 (dx-p (node-stack-allocate-p node))
1096 (alloc-area-tn (if dx-p csp-tn alloc-tn)))
1097 (move context context-arg)
1098 (move count count-arg)
1099 ;; Check to see if there are any arguments.
1100 (inst cmpwi count 0)
1101 (move result null-tn)
1104 ;; We need to do this atomically.
1105 (pseudo-atomic (pa-flag)
1108 ;; Allocate a cons (2 words) for each item.
1109 (inst clrrwi result alloc-area-tn n-lowtag-bits)
1110 (inst ori result result list-pointer-lowtag)
1112 (inst slwi temp count 1)
1113 (inst add alloc-area-tn alloc-area-tn temp)
1116 ;; Compute the next cons and store it in the current one.
1118 (inst addi dst dst (* 2 n-word-bytes))
1119 (storew dst dst -1 list-pointer-lowtag)
1123 (loadw temp context)
1124 (inst addi context context n-word-bytes)
1126 ;; Dec count, and if != zero, go back for more.
1127 (inst addic. count count (- (fixnumize 1)))
1128 ;; Store the value into the car of the current cons (in the delay
1130 (storew temp dst 0 list-pointer-lowtag)
1133 ;; NIL out the last cons.
1134 (storew null-tn dst 1 list-pointer-lowtag))
1135 (emit-label done))))
1138 ;;; Return the location and size of the more arg glob created by
1139 ;;; COPY-MORE-ARG. SUPPLIED is the total number of arguments supplied
1140 ;;; (originally passed in NARGS.) Fixed is the number of non-rest
1143 ;;; We must duplicate some of the work done by COPY-MORE-ARG, since at
1144 ;;; that time the environment is in a pretty brain-damaged state,
1145 ;;; preventing this info from being returned as values. What we do is
1146 ;;; compute (- SUPPLIED FIXED), and return a pointer that many words
1147 ;;; below the current stack top.
1148 (define-vop (more-arg-context)
1149 (:policy :fast-safe)
1150 (:translate sb!c::%more-arg-context)
1151 (:args (supplied :scs (any-reg)))
1152 (:arg-types tagged-num (:constant fixnum))
1154 (:results (context :scs (descriptor-reg))
1155 (count :scs (any-reg)))
1156 (:result-types t tagged-num)
1157 (:note "more-arg-context")
1159 (inst subi count supplied (fixnumize fixed))
1160 (inst sub context csp-tn count)))
1162 (define-vop (verify-arg-count)
1163 (:policy :fast-safe)
1164 (:translate sb!c::%verify-arg-count)
1165 (:args (nargs :scs (any-reg)))
1166 (:arg-types positive-fixnum (:constant t))
1169 (:save-p :compute-only)
1171 (inst twi :ne nargs (fixnumize count))))
1173 ;;; Signal various errors.
1174 (macrolet ((frob (name error translate &rest args)
1175 `(define-vop (,name)
1177 `((:policy :fast-safe)
1178 (:translate ,translate)))
1179 (:args ,@(mapcar #'(lambda (arg)
1180 `(,arg :scs (any-reg descriptor-reg)))
1183 (:save-p :compute-only)
1185 (error-call vop ,error ,@args)))))
1186 (frob arg-count-error invalid-arg-count-error
1187 sb!c::%arg-count-error nargs)
1188 (frob type-check-error object-not-type-error sb!c::%type-check-error
1190 (frob layout-invalid-error layout-invalid-error sb!c::%layout-invalid-error
1192 (frob odd-key-args-error odd-key-args-error
1193 sb!c::%odd-key-args-error)
1194 (frob unknown-key-arg-error unknown-key-arg-error
1195 sb!c::%unknown-key-arg-error key)
1196 (frob nil-fun-returned-error nil-fun-returned-error nil fun))