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
19 (!def-vm-support-routine standard-arg-location (n)
20 (declare (type unsigned-byte n))
21 (if (< n register-arg-count)
22 (make-wired-tn *backend-t-primitive-type* register-arg-scn
23 (elt *register-arg-offsets* n))
24 (make-wired-tn *backend-t-primitive-type* control-stack-arg-scn n)))
27 ;;; Make a passing location TN for a local call return PC. If
28 ;;; standard is true, then use the standard (full call) location,
29 ;;; otherwise use any legal location. Even in the non-standard case,
30 ;;; this may be restricted by a desire to use a subroutine call
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)
58 (physenv-debug-live-tn (make-normal-tn *backend-t-primitive-type*) env)
59 (make-wired-tn *backend-t-primitive-type*
63 ;;; Make a TN for the standard argument count passing location. We
64 ;;; only need to make the standard location, since a count is never
65 ;;; passed when we are using non-standard conventions.
66 (!def-vm-support-routine make-arg-count-location ()
67 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn nargs-offset))
70 ;;; Make a TN to hold the number-stack frame pointer. This is
71 ;;; allocated once per component, and is component-live.
72 (!def-vm-support-routine make-nfp-tn ()
74 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn nfp-offset)))
76 (!def-vm-support-routine make-stack-pointer-tn ()
77 (make-normal-tn *fixnum-primitive-type*))
79 (!def-vm-support-routine make-number-stack-pointer-tn ()
80 (make-normal-tn *fixnum-primitive-type*))
82 ;;; Return a list of TNs that can be used to represent an unknown-values
83 ;;; continuation within a function.
84 (!def-vm-support-routine make-unknown-values-locations ()
85 (list (make-stack-pointer-tn)
86 (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 ;;; this is the first function in this file that differs materially from
103 ;;; ../alpha/call.lisp
104 (defun bytes-needed-for-non-descriptor-stack-frame ()
105 (logandc2 (+ +stack-alignment-bytes+ number-stack-displacement
106 (* (sb-allocated-size 'non-descriptor-stack) n-word-bytes))
107 +stack-alignment-bytes+))
110 ;;; Used for setting up the Old-FP in local call.
112 (define-vop (current-fp)
113 (:results (val :scs (any-reg)))
117 ;;; Used for computing the caller's NFP for use in known-values return. Only
118 ;;; works assuming there is no variable size stuff on the nstack.
120 (define-vop (compute-old-nfp)
121 (:results (val :scs (any-reg)))
124 (let ((nfp (current-nfp-tn vop)))
126 (inst addi val nfp (bytes-needed-for-non-descriptor-stack-frame))))))
129 (define-vop (xep-allocate-frame)
130 (:info start-lab copy-more-arg-follows)
131 (:ignore copy-more-arg-follows)
133 (:temporary (:scs (non-descriptor-reg)) temp)
135 ;; Make sure the function is aligned, and drop a label pointing to this
137 (align n-lowtag-bits)
138 (trace-table-entry trace-table-fun-prologue)
139 (emit-label start-lab)
140 ;; Allocate function header.
141 (inst simple-fun-header-word)
142 (dotimes (i (1- simple-fun-code-offset))
144 (let* ((entry-point (gen-label)))
145 (emit-label entry-point)
146 (inst compute-code-from-fn code-tn lip-tn entry-point temp))
147 ;; FIXME alpha port has a ### note here saying we should "save it
148 ;; on the stack" so that GC sees it. No idea what "it" is -dan 20020110
149 ;; Build our stack frames.
150 (inst addi csp-tn cfp-tn
151 (* n-word-bytes (sb-allocated-size 'control-stack)))
152 (let ((nfp-tn (current-nfp-tn vop)))
154 (let* ((nbytes (bytes-needed-for-non-descriptor-stack-frame)))
155 (when (> nbytes number-stack-displacement)
156 (inst stwu nsp-tn nsp-tn (- nbytes))
157 (inst addi nfp-tn nsp-tn number-stack-displacement)))))
158 (trace-table-entry trace-table-normal)))
160 (define-vop (allocate-frame)
161 (:results (res :scs (any-reg))
162 (nfp :scs (any-reg)))
165 (trace-table-entry trace-table-fun-prologue)
167 (inst addi csp-tn csp-tn
168 (* n-word-bytes (sb-allocated-size 'control-stack)))
169 (when (ir2-physenv-number-stack-p callee)
170 (let* ((nbytes (bytes-needed-for-non-descriptor-stack-frame)))
171 (when (> nbytes number-stack-displacement)
172 (inst stwu nsp-tn nsp-tn (- (bytes-needed-for-non-descriptor-stack-frame)))
173 (inst addi nfp nsp-tn number-stack-displacement))))
174 (trace-table-entry trace-table-normal)))
176 ;;; Allocate a partial frame for passing stack arguments in a full call. Nargs
177 ;;; is the number of arguments passed. If no stack arguments are passed, then
178 ;;; we don't have to do anything.
180 (define-vop (allocate-full-call-frame)
182 (:results (res :scs (any-reg)))
184 (when (> nargs register-arg-count)
186 (inst addi csp-tn csp-tn (* nargs n-word-bytes)))))
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 ;;; callee 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 old-fp csp ; Set up args for SP resetting
225 subcc temp nargs register-arg-count
227 b :lt default-value-7 ; jump to default code
228 loadw move-temp ocfp-tn 6 ; Move value to correct location.
230 store-stack-tn val4-tn move-temp
232 b :lt default-value-8
233 loadw move-temp ocfp-tn 7
235 store-stack-tn val5-tn move-temp
240 move csp 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 ;;; differences from alpha: (1) alpha tests for lra-label before
256 ;;; compute-code-from-lra and skips if nil. (2) loop termination is
257 ;;; different when clearing stack defaults
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 (sb!assem:without-scheduling ()
265 (note-this-location vop :single-value-return)
266 (move csp-tn ocfp-tn)
268 (inst compute-code-from-lra code-tn code-tn lra-label temp))
269 (let ((regs-defaulted (gen-label))
270 (defaulting-done (gen-label))
271 (default-stack-vals (gen-label)))
272 ;; Branch off to the MV case.
273 (sb!assem:without-scheduling ()
274 (note-this-location vop :unknown-return)
275 (if (> nvals register-arg-count)
276 (inst addic. temp nargs-tn (- (fixnumize register-arg-count)))
277 (move csp-tn ocfp-tn))
278 (inst b regs-defaulted))
280 ;; Do the single value case.
282 (val (tn-ref-across values) (tn-ref-across val)))
283 ((= i (min nvals register-arg-count)))
284 (move (tn-ref-tn val) null-tn))
285 (when (> nvals register-arg-count)
286 (move ocfp-tn csp-tn)
287 (inst b default-stack-vals))
289 (emit-label regs-defaulted)
290 (when (> nvals register-arg-count)
291 (collect ((defaults))
292 (do ((i register-arg-count (1+ i))
293 (val (do ((i 0 (1+ i))
294 (val values (tn-ref-across val)))
295 ((= i register-arg-count) val))
296 (tn-ref-across val)))
299 (let ((default-lab (gen-label))
300 (tn (tn-ref-tn val)))
301 (defaults (cons default-lab tn))
303 (inst lwz move-temp ocfp-tn (* i n-word-bytes))
304 (inst ble default-lab)
305 (inst addic. temp temp (- (fixnumize 1)))
306 (store-stack-tn tn move-temp)))
308 (emit-label defaulting-done)
309 (move csp-tn ocfp-tn)
311 (let ((defaults (defaults)))
313 (assemble (*elsewhere*)
314 (emit-label default-stack-vals)
315 (trace-table-entry trace-table-fun-prologue)
316 (do ((remaining defaults (cdr remaining)))
318 (let ((def (car remaining)))
319 (emit-label (car def))
320 (when (null (cdr remaining))
321 (inst b defaulting-done))
322 (store-stack-tn (cdr def) null-tn)))
323 (trace-table-entry trace-table-normal))))))
325 (inst compute-code-from-lra code-tn code-tn lra-label temp)))
329 ;;;; Unknown values receiving:
331 ;;; Emit code needed at the return point for an unknown-values call for an
332 ;;; arbitrary number of values.
334 ;;; We do the single and non-single cases with no shared code: there doesn't
335 ;;; seem to be any potential overlap, and receiving a single value is more
336 ;;; important efficiency-wise.
338 ;;; When there is a single value, we just push it on the stack, returning
339 ;;; the old SP and 1.
341 ;;; When there is a variable number of values, we move all of the argument
342 ;;; registers onto the stack, and return Args and Nargs.
344 ;;; Args and Nargs are TNs wired to the named locations. We must
345 ;;; explicitly allocate these TNs, since their lifetimes overlap with the
346 ;;; results Start and Count (also, it's nice to be able to target them).
348 (defun receive-unknown-values (args nargs start count lra-label temp)
349 (declare (type tn args nargs start count temp))
350 (let ((variable-values (gen-label))
352 (sb!assem:without-scheduling ()
353 (inst b variable-values)
356 (inst compute-code-from-lra code-tn code-tn lra-label temp)
357 (inst addi csp-tn csp-tn 4)
358 (storew (first *register-arg-tns*) csp-tn -1)
359 (inst subi start csp-tn 4)
360 (inst li count (fixnumize 1))
364 (assemble (*elsewhere*)
365 (trace-table-entry trace-table-fun-prologue)
366 (emit-label variable-values)
367 (inst compute-code-from-lra code-tn code-tn lra-label temp)
368 (do ((arg *register-arg-tns* (rest arg))
371 (storew (first arg) args i))
375 (trace-table-entry trace-table-normal)))
379 ;;; VOP that can be inherited by unknown values receivers. The main thing this
380 ;;; handles is allocation of the result temporaries.
382 (define-vop (unknown-values-receiver)
384 (start :scs (any-reg))
385 (count :scs (any-reg)))
386 (:temporary (:sc descriptor-reg :offset ocfp-offset
387 :from :eval :to (:result 0))
389 (:temporary (:sc any-reg :offset nargs-offset
390 :from :eval :to (:result 1))
392 (: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 done.
408 ;;; 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 function.
410 ;;; Nvals is the number of values received.
412 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
413 ;;; registers may be tied up by the more operand. Instead, we use
414 ;;; MAYBE-LOAD-STACK-TN.
416 (define-vop (call-local)
420 (:results (values :more t))
422 (:move-args :local-call)
423 (:info arg-locs callee target nvals)
425 (:temporary (:scs (descriptor-reg) :from (:eval 0)) move-temp)
426 (:temporary (:scs (non-descriptor-reg)) temp)
427 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
428 (:temporary (:sc any-reg :offset ocfp-offset :from (:eval 0)) ocfp)
429 (:ignore arg-locs args ocfp)
431 (trace-table-entry trace-table-call-site)
432 (let ((label (gen-label))
433 (cur-nfp (current-nfp-tn vop)))
435 (store-stack-tn nfp-save cur-nfp))
436 (let ((callee-nfp (callee-nfp-tn callee)))
438 (maybe-load-stack-tn callee-nfp nfp)))
439 (maybe-load-stack-tn cfp-tn fp)
440 (inst compute-lra-from-code
441 (callee-return-pc-tn callee) code-tn label temp)
442 (note-this-location vop :call-site)
444 (emit-return-pc label)
445 (default-unknown-values vop values nvals move-temp temp label)
446 ;; alpha uses (maybe-load-stack-nfp-tn cur-nfp nfp-save temp)
447 ;; instead of the clause below
449 (load-stack-tn cur-nfp nfp-save)))
450 (trace-table-entry trace-table-normal)))
453 ;;; Non-TR local call for a variable number of return values passed according
454 ;;; to the unknown values convention. The results are the start of the values
455 ;;; glob and the number of values received.
457 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
458 ;;; registers may be tied up by the more operand. Instead, we use
459 ;;; MAYBE-LOAD-STACK-TN.
461 (define-vop (multiple-call-local unknown-values-receiver)
466 (:move-args :local-call)
467 (:info save callee target)
470 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
471 (:temporary (:scs (non-descriptor-reg)) temp)
473 (trace-table-entry trace-table-call-site)
474 (let ((label (gen-label))
475 (cur-nfp (current-nfp-tn vop)))
477 (store-stack-tn nfp-save cur-nfp))
478 (let ((callee-nfp (callee-nfp-tn callee)))
479 ;; alpha doesn't test this before the maybe-load
481 (maybe-load-stack-tn callee-nfp nfp)))
482 (maybe-load-stack-tn cfp-tn fp)
483 (inst compute-lra-from-code
484 (callee-return-pc-tn callee) code-tn label temp)
485 (note-this-location vop :call-site)
487 (emit-return-pc label)
488 (note-this-location vop :unknown-return)
489 (receive-unknown-values values-start nvals start count label temp)
491 (load-stack-tn cur-nfp nfp-save)))
492 (trace-table-entry trace-table-normal)))
495 ;;;; Local call with known values return:
497 ;;; Non-TR local call with known return locations. Known-value return works
498 ;;; just like argument passing in local call.
500 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
501 ;;; registers may be tied up by the more operand. Instead, we use
502 ;;; MAYBE-LOAD-STACK-TN.
504 (define-vop (known-call-local)
508 (:results (res :more t))
509 (:move-args :local-call)
511 (:info save callee target)
512 (:ignore args res save)
514 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
515 (:temporary (:scs (non-descriptor-reg)) temp)
517 (trace-table-entry trace-table-call-site)
518 (let ((label (gen-label))
519 (cur-nfp (current-nfp-tn vop)))
521 (store-stack-tn nfp-save cur-nfp))
522 (let ((callee-nfp (callee-nfp-tn callee)))
524 (maybe-load-stack-tn callee-nfp nfp)))
525 (maybe-load-stack-tn cfp-tn fp)
526 (inst compute-lra-from-code
527 (callee-return-pc-tn callee) code-tn label temp)
528 (note-this-location vop :call-site)
530 (emit-return-pc label)
531 (note-this-location vop :known-return)
533 (load-stack-tn cur-nfp nfp-save)))
534 (trace-table-entry trace-table-normal)))
536 ;;; Return from known values call. We receive the return locations as
537 ;;; arguments to terminate their lifetimes in the returning function. We
538 ;;; restore FP and CSP and jump to the Return-PC.
540 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
541 ;;; registers may be tied up by the more operand. Instead, we use
542 ;;; MAYBE-LOAD-STACK-TN.
544 (define-vop (known-return)
545 (:args (old-fp :target old-fp-temp)
546 (return-pc :target return-pc-temp)
548 (:temporary (:sc any-reg :from (:argument 0)) old-fp-temp)
549 (:temporary (:sc descriptor-reg :from (:argument 1)) return-pc-temp)
550 (:move-args :known-return)
552 (:ignore val-locs vals)
555 (trace-table-entry trace-table-fun-epilogue)
556 (maybe-load-stack-tn old-fp-temp old-fp)
557 (maybe-load-stack-tn return-pc-temp return-pc)
559 (let ((cur-nfp (current-nfp-tn vop)))
561 (inst addi nsp-tn cur-nfp
562 (- (bytes-needed-for-non-descriptor-stack-frame)
563 number-stack-displacement))))
564 (move cfp-tn old-fp-temp)
565 (inst j return-pc-temp (- n-word-bytes other-pointer-lowtag))
566 (trace-table-entry trace-table-normal)))
571 ;;; There is something of a cross-product effect with full calls. Different
572 ;;; versions are used depending on whether we know the number of arguments or
573 ;;; the name of the called function, and whether we want fixed values, unknown
574 ;;; values, or a tail call.
576 ;;; In full call, the arguments are passed creating a partial frame on the
577 ;;; stack top and storing stack arguments into that frame. On entry to the
578 ;;; callee, this partial frame is pointed to by FP. If there are no stack
579 ;;; arguments, we don't bother allocating a partial frame, and instead set FP
580 ;;; to SP just before the call.
582 ;;; This macro helps in the definition of full call VOPs by avoiding code
583 ;;; replication in defining the cross-product VOPs.
585 ;;; NAME is the name of the VOP to define.
587 ;;; NAMED is true if the first argument is a symbol whose global function
588 ;;; definition is to be called.
590 ;;; RETURN is either :FIXED, :UNKNOWN or :TAIL:
591 ;;; -- If :FIXED, then the call is for a fixed number of values, returned in
592 ;;; the standard passing locations (passed as result operands).
593 ;;; -- If :UNKNOWN, then the result values are pushed on the stack, and the
594 ;;; result values are specified by the Start and Count as in the
595 ;;; unknown-values continuation representation.
596 ;;; -- If :TAIL, then do a tail-recursive call. No values are returned.
597 ;;; The Old-Fp and Return-PC are passed as the second and third arguments.
599 ;;; In non-tail calls, the pointer to the stack arguments is passed as the last
600 ;;; fixed argument. If VARIABLE is false, then the passing locations are
601 ;;; passed as a more arg. VARIABLE is true if there are a variable number of
602 ;;; arguments passed on the stack. VARIABLE cannot be specified with :TAIL
603 ;;; return. TR variable argument call is implemented separately.
605 ;;; In tail call with fixed arguments, the passing locations are passed as a
606 ;;; more arg, but there is no new-FP, since the arguments have been set up in
607 ;;; the current frame.
608 (defmacro define-full-call (name named return variable)
609 (assert (not (and variable (eq return :tail))))
611 ,@(when (eq return :unknown)
612 '(unknown-values-receiver)))
614 ,@(unless (eq return :tail)
615 '((new-fp :scs (any-reg) :to :eval)))
618 '(name :target name-pass)
619 '(arg-fun :target lexenv))
621 ,@(when (eq return :tail)
622 '((old-fp :target old-fp-pass)
623 (return-pc :target return-pc-pass)))
625 ,@(unless variable '((args :more t :scs (descriptor-reg)))))
627 ,@(when (eq return :fixed)
628 '((:results (values :more t))))
630 (:save-p ,(if (eq return :tail) :compute-only t))
632 ,@(unless (or (eq return :tail) variable)
633 '((:move-args :full-call)))
636 (:info ,@(unless (or variable (eq return :tail)) '(arg-locs))
637 ,@(unless variable '(nargs))
638 ,@(when (eq return :fixed) '(nvals)))
641 ,@(unless (or variable (eq return :tail)) '(arg-locs))
642 ,@(unless variable '(args)))
644 (:temporary (:sc descriptor-reg
647 ,@(unless (eq return :fixed)
651 (:temporary (:sc descriptor-reg
653 :from (:argument ,(if (eq return :tail) 2 1))
658 `(:temporary (:sc descriptor-reg :offset fdefn-offset ; -dan
659 :from (:argument ,(if (eq return :tail) 0 1))
662 `(:temporary (:sc descriptor-reg :offset lexenv-offset
663 :from (:argument ,(if (eq return :tail) 0 1))
666 ;; alpha code suggests that function tn is not needed for named call
667 (:temporary (:scs (descriptor-reg) :from (:argument 0) :to :eval)
669 (:temporary (:sc any-reg :offset nargs-offset :to :eval)
673 (mapcar #'(lambda (name offset)
674 `(:temporary (:sc descriptor-reg
678 register-arg-names *register-arg-offsets*))
679 ,@(when (eq return :fixed)
680 '((:temporary (:scs (descriptor-reg) :from :eval) move-temp)))
682 ,@(unless (eq return :tail)
683 '((:temporary (:scs (non-descriptor-reg)) temp)
684 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)))
686 (:temporary (:sc interior-reg :offset lip-offset) entry-point)
688 (:generator ,(+ (if named 5 0)
690 (if (eq return :tail) 0 10)
692 (if (eq return :unknown) 25 0))
693 (trace-table-entry trace-table-call-site)
694 (let* ((cur-nfp (current-nfp-tn vop))
695 ,@(unless (eq return :tail)
696 '((lra-label (gen-label))))
700 ,@(if (eq return :tail)
701 '((unless (location= old-fp old-fp-pass)
703 (unless (location= return-pc
713 (flet ((do-next-filler ()
714 (let* ((next (pop filler))
715 (what (if (consp next) (car next) next)))
719 `((inst sub nargs-pass csp-tn new-fp)
721 (mapcar #'(lambda (name)
724 register-arg-names)))
725 '((inst lr nargs-pass (fixnumize nargs)))))
726 ,@(if (eq return :tail)
730 (inst mr old-fp-pass old-fp))
732 (loadw old-fp-pass cfp-tn
733 (tn-offset old-fp)))))
737 (inst mr return-pc-pass return-pc))
739 (loadw return-pc-pass cfp-tn
740 (tn-offset return-pc)))))
742 (inst addi nsp-tn cur-nfp
743 (- (bytes-needed-for-non-descriptor-stack-frame)
744 number-stack-displacement))))
746 (inst compute-lra-from-code
747 return-pc-pass code-tn lra-label temp))
749 (store-stack-tn nfp-save cur-nfp))
751 (inst mr old-fp-pass cfp-tn))
754 '(move cfp-tn new-fp)
755 '(if (> nargs register-arg-count)
757 (move cfp-tn csp-tn))))))
761 (descriptor-reg (move name-pass name))
763 (loadw name-pass cfp-tn (tn-offset name))
766 (loadw name-pass code-tn (tn-offset name)
767 other-pointer-lowtag)
769 (loadw entry-point name-pass fdefn-raw-addr-slot
770 other-pointer-lowtag)
773 (descriptor-reg (move lexenv arg-fun))
775 (loadw lexenv cfp-tn (tn-offset arg-fun))
778 (loadw lexenv code-tn (tn-offset arg-fun)
779 other-pointer-lowtag)
781 (loadw function lexenv closure-fun-slot
784 (inst addi entry-point function
785 (- (ash simple-fun-code-offset word-shift)
793 (note-this-location vop :call-site)
794 (inst mtctr entry-point)
795 ;; this following line is questionable. or else the alpha
796 ;; code (which doesn't do it) is questionable
797 ;; (inst mr code-tn function)
802 '((emit-return-pc lra-label)
803 (default-unknown-values vop values nvals move-temp
806 (load-stack-tn cur-nfp nfp-save))))
808 '((emit-return-pc lra-label)
809 (note-this-location vop :unknown-return)
810 (receive-unknown-values values-start nvals start count
813 (load-stack-tn cur-nfp nfp-save))))
815 (trace-table-entry trace-table-normal))))
818 (define-full-call call nil :fixed nil)
819 (define-full-call call-named t :fixed nil)
820 (define-full-call multiple-call nil :unknown nil)
821 (define-full-call multiple-call-named t :unknown nil)
822 (define-full-call tail-call nil :tail nil)
823 (define-full-call tail-call-named t :tail nil)
825 (define-full-call call-variable nil :fixed t)
826 (define-full-call multiple-call-variable nil :unknown t)
829 ;;; Defined separately, since needs special code that BLT's the arguments
832 (define-vop (tail-call-variable)
834 (args-arg :scs (any-reg) :target args)
835 (function-arg :scs (descriptor-reg) :target lexenv)
836 (old-fp-arg :scs (any-reg) :target old-fp)
837 (lra-arg :scs (descriptor-reg) :target lra))
839 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 0)) args)
840 (:temporary (:sc any-reg :offset lexenv-offset :from (:argument 1)) lexenv)
841 (:temporary (:sc any-reg :offset ocfp-offset :from (:argument 2)) old-fp)
842 (:temporary (:sc any-reg :offset lra-offset :from (:argument 3)) lra)
849 ;; Move these into the passing locations if they are not already there.
851 (move lexenv function-arg)
852 (move old-fp old-fp-arg)
856 ;; Clear the number stack if anything is there.
857 (let ((cur-nfp (current-nfp-tn vop)))
859 (inst addi nsp-tn cur-nfp
860 (- (bytes-needed-for-non-descriptor-stack-frame)
861 number-stack-displacement))))
864 (inst ba (make-fixup 'tail-call-variable :assembly-routine))))
867 ;;;; Unknown values return:
870 ;;; Return a single value using the unknown-values convention.
872 (define-vop (return-single)
873 (:args (old-fp :scs (any-reg))
874 (return-pc :scs (descriptor-reg))
877 (:temporary (:scs (interior-reg)) lip)
880 (trace-table-entry trace-table-fun-epilogue)
881 ;; Clear the number stack.
882 (let ((cur-nfp (current-nfp-tn vop)))
884 (inst addi nsp-tn cur-nfp
885 (- (bytes-needed-for-non-descriptor-stack-frame)
886 number-stack-displacement))))
887 ;; Clear the control stack, and restore the frame pointer.
891 (lisp-return return-pc lip :offset 2)
892 (trace-table-entry trace-table-normal)))
894 ;;; Do unknown-values return of a fixed number of values. The Values are
895 ;;; required to be set up in the standard passing locations. Nvals is the
896 ;;; number of values returned.
898 ;;; If returning a single value, then deallocate the current frame, restore
899 ;;; FP and jump to the single-value entry at Return-PC + 8.
901 ;;; If returning other than one value, then load the number of values returned,
902 ;;; NIL out unsupplied values registers, restore FP and return at Return-PC.
903 ;;; When there are stack values, we must initialize the argument pointer to
904 ;;; point to the beginning of the values block (which is the beginning of the
909 (old-fp :scs (any-reg))
910 (return-pc :scs (descriptor-reg) :to (:eval 1))
914 (:temporary (:sc descriptor-reg :offset a0-offset :from (:eval 0)) a0)
915 (:temporary (:sc descriptor-reg :offset a1-offset :from (:eval 0)) a1)
916 (:temporary (:sc descriptor-reg :offset a2-offset :from (:eval 0)) a2)
917 (:temporary (:sc descriptor-reg :offset a3-offset :from (:eval 0)) a3)
918 (:temporary (:sc any-reg :offset nargs-offset) nargs)
919 (:temporary (:sc any-reg :offset ocfp-offset) val-ptr)
920 (:temporary (:scs (interior-reg)) lip)
923 (trace-table-entry trace-table-fun-epilogue)
924 ;; Clear the number stack.
925 (let ((cur-nfp (current-nfp-tn vop)))
927 (inst addi nsp-tn cur-nfp
928 (- (bytes-needed-for-non-descriptor-stack-frame)
929 number-stack-displacement))))
931 ;; Clear the control stack, and restore the frame pointer.
935 (lisp-return return-pc lip :offset 2))
937 ;; Establish the values pointer and values count.
938 (move val-ptr cfp-tn)
939 (inst lr nargs (fixnumize nvals))
940 ;; restore the frame pointer and clear as much of the control
941 ;; stack as possible.
943 (inst addi csp-tn val-ptr (* nvals n-word-bytes))
944 ;; pre-default any argument register that need it.
945 (when (< nvals register-arg-count)
946 (dolist (reg (subseq (list a0 a1 a2 a3) nvals))
949 (lisp-return return-pc lip)))
950 (trace-table-entry trace-table-normal)))
952 ;;; Do unknown-values return of an arbitrary number of values (passed on the
953 ;;; stack.) We check for the common case of a single return value, and do that
954 ;;; inline using the normal single value return convention. Otherwise, we
955 ;;; branch off to code that calls an assembly-routine.
957 (define-vop (return-multiple)
959 (old-fp-arg :scs (any-reg) :to (:eval 1))
960 (lra-arg :scs (descriptor-reg) :to (:eval 1))
961 (vals-arg :scs (any-reg) :target vals)
962 (nvals-arg :scs (any-reg) :target nvals))
964 (:temporary (:sc any-reg :offset nl1-offset :from (:argument 0)) old-fp)
965 (:temporary (:sc descriptor-reg :offset lra-offset :from (:argument 1)) lra)
966 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 2)) vals)
967 (:temporary (:sc any-reg :offset nargs-offset :from (:argument 3)) nvals)
968 (:temporary (:sc descriptor-reg :offset a0-offset) a0)
969 (:temporary (:scs (interior-reg)) lip)
975 (trace-table-entry trace-table-fun-epilogue)
976 (let ((not-single (gen-label)))
977 ;; Clear the number stack.
978 (let ((cur-nfp (current-nfp-tn vop)))
980 (inst addi nsp-tn cur-nfp
981 (- (bytes-needed-for-non-descriptor-stack-frame)
982 number-stack-displacement))))
984 ;; Check for the single case.
985 (inst cmpwi nvals-arg (fixnumize 1))
986 (inst lwz a0 vals-arg 0)
987 (inst bne not-single)
989 ;; Return with one value.
991 (move cfp-tn old-fp-arg)
992 (lisp-return lra-arg lip :offset 2)
994 ;; Nope, not the single case.
995 (emit-label not-single)
996 (move old-fp old-fp-arg)
999 (move nvals nvals-arg)
1000 (inst ba (make-fixup 'return-multiple :assembly-routine)))
1001 (trace-table-entry trace-table-normal)))
1008 ;;; We don't need to do anything special for regular functions.
1010 (define-vop (setup-environment)
1014 ;; Don't bother doing anything.
1017 ;;; Get the lexical environment from its passing location.
1019 (define-vop (setup-closure-environment)
1020 (:temporary (:sc descriptor-reg :offset lexenv-offset :target closure
1023 (:results (closure :scs (descriptor-reg)))
1028 (move closure lexenv)))
1030 ;;; Copy a more arg from the argument area to the end of the current frame.
1031 ;;; Fixed is the number of non-more arguments.
1033 (define-vop (copy-more-arg)
1034 (:temporary (:sc any-reg :offset nl0-offset) result)
1035 (:temporary (:sc any-reg :offset nl1-offset) count)
1036 (:temporary (:sc any-reg :offset nl2-offset) src)
1037 (:temporary (:sc any-reg :offset nl3-offset) dst)
1038 (:temporary (:sc descriptor-reg :offset l0-offset) temp)
1041 (let ((loop (gen-label))
1042 (do-regs (gen-label))
1044 (when (< fixed register-arg-count)
1045 ;; Save a pointer to the results so we can fill in register args.
1046 ;; We don't need this if there are more fixed args than reg args.
1047 (move result csp-tn))
1048 ;; Allocate the space on the stack.
1049 (cond ((zerop fixed)
1050 (inst cmpwi nargs-tn 0)
1051 (inst add csp-tn csp-tn nargs-tn)
1054 (inst addic. count nargs-tn (- (fixnumize fixed)))
1056 (inst add csp-tn csp-tn count)))
1057 (when (< fixed register-arg-count)
1058 ;; We must stop when we run out of stack args, not when we run out of
1060 (inst addic. count nargs-tn (- (fixnumize register-arg-count)))
1061 ;; Everything of interest is in registers.
1063 ;; Initialize dst to be end of stack.
1065 ;; Initialize src to be end of args.
1066 (inst add src cfp-tn nargs-tn)
1069 ;; *--dst = *--src, --count
1070 (inst addi src src (- n-word-bytes))
1071 (inst addic. count count (- (fixnumize 1)))
1073 (inst addi dst dst (- n-word-bytes))
1077 (emit-label do-regs)
1078 (when (< fixed register-arg-count)
1079 ;; Now we have to deposit any more args that showed up in registers.
1080 (inst subic. count nargs-tn (fixnumize fixed))
1081 (do ((i fixed (1+ i)))
1082 ((>= i register-arg-count))
1083 ;; Don't deposit any more than there are.
1085 (inst subic. count count (fixnumize 1))
1086 ;; Store it relative to the pointer saved at the start.
1087 (storew (nth i *register-arg-tns*) result (- i fixed))))
1088 (emit-label done))))
1091 ;;; More args are stored consecutively on the stack, starting immediately at
1092 ;;; the context pointer. The context pointer is not typed, so the lowtag is 0.
1094 (define-vop (more-arg word-index-ref)
1096 (:translate %more-arg))
1099 ;;; Turn more arg (context, count) into a list.
1101 (define-vop (listify-rest-args)
1102 (:args (context-arg :target context :scs (descriptor-reg))
1103 (count-arg :target count :scs (any-reg)))
1104 (:arg-types * tagged-num)
1105 (:temporary (:scs (any-reg) :from (:argument 0)) context)
1106 (:temporary (:scs (any-reg) :from (:argument 1)) count)
1107 (:temporary (:scs (descriptor-reg) :from :eval) temp)
1108 (:temporary (:scs (non-descriptor-reg) :from :eval) dst)
1109 (:temporary (:sc non-descriptor-reg :offset nl3-offset) pa-flag)
1110 (:results (result :scs (descriptor-reg)))
1111 (:translate %listify-rest-args)
1114 (move context context-arg)
1115 (move count count-arg)
1116 ;; Check to see if there are any arguments.
1117 (inst cmpwi count 0)
1118 (move result null-tn)
1121 ;; We need to do this atomically.
1122 (pseudo-atomic (pa-flag)
1124 ;; Allocate a cons (2 words) for each item.
1125 (inst clrrwi result alloc-tn n-lowtag-bits)
1126 (inst ori result result list-pointer-lowtag)
1128 (inst slwi temp count 1)
1129 (inst add alloc-tn alloc-tn temp)
1132 ;; Compute the next cons and store it in the current one.
1134 (inst addi dst dst (* 2 n-word-bytes))
1135 (storew dst dst -1 list-pointer-lowtag)
1139 (loadw temp context)
1140 (inst addi context context n-word-bytes)
1142 ;; Dec count, and if != zero, go back for more.
1143 (inst addic. count count (- (fixnumize 1)))
1144 ;; Store the value into the car of the current cons (in the delay
1146 (storew temp dst 0 list-pointer-lowtag)
1150 ;; NIL out the last cons.
1151 (storew null-tn dst 1 list-pointer-lowtag)))
1155 ;;; Return the location and size of the more arg glob created by Copy-More-Arg.
1156 ;;; Supplied is the total number of arguments supplied (originally passed in
1157 ;;; NARGS.) Fixed is the number of non-rest arguments.
1159 ;;; We must duplicate some of the work done by Copy-More-Arg, since at that
1160 ;;; time the environment is in a pretty brain-damaged state, preventing this
1161 ;;; info from being returned as values. What we do is compute
1162 ;;; supplied - fixed, and return a pointer that many words below the current
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 subi count supplied (fixnumize fixed))
1177 (inst sub context csp-tn count)))
1180 ;;; Signal wrong argument count error if Nargs isn't = to Count.
1183 (define-vop (verify-argument-count)
1184 (:policy :fast-safe)
1185 (:translate sb!c::%verify-argument-count)
1186 (:args (nargs :scs (any-reg)))
1187 (:arg-types positive-fixnum (:constant t))
1190 (:save-p :compute-only)
1193 (generate-error-code vop invalid-argument-count-error nargs)))
1194 (inst cmpwi nargs (fixnumize count))
1195 (inst bne err-lab))))
1197 (define-vop (verify-arg-count)
1198 (:policy :fast-safe)
1199 (:translate sb!c::%verify-arg-count)
1200 (:args (nargs :scs (any-reg)))
1201 (:arg-types positive-fixnum (:constant t))
1204 (:save-p :compute-only)
1206 (inst twi :ne nargs (fixnumize count))))
1209 ;;; Signal various errors.
1211 (macrolet ((frob (name error translate &rest args)
1212 `(define-vop (,name)
1214 `((:policy :fast-safe)
1215 (:translate ,translate)))
1216 (:args ,@(mapcar #'(lambda (arg)
1217 `(,arg :scs (any-reg descriptor-reg)))
1220 (:save-p :compute-only)
1222 (error-call vop ,error ,@args)))))
1223 (frob arg-count-error invalid-arg-count-error
1224 sb!c::%arg-count-error nargs)
1225 (frob type-check-error object-not-type-error sb!c::%type-check-error
1227 (frob layout-invalid-error layout-invalid-error sb!c::%layout-invalid-error
1229 (frob odd-key-args-error odd-key-args-error
1230 sb!c::%odd-key-args-error)
1231 (frob unknown-key-arg-error unknown-key-arg-error
1232 sb!c::%unknown-key-arg-error key)
1233 (frob nil-fun-returned-error nil-fun-returned-error nil fun))