1 ;;;; the VM definition of function call for the Alpha
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
14 ;;;; interfaces to IR2 conversion
16 ;;; Return a wired TN describing the N'th full call argument passing
18 (!def-vm-support-routine standard-arg-location (n)
19 (declare (type unsigned-byte n))
20 (if (< n register-arg-count)
21 (make-wired-tn *backend-t-primitive-type*
23 (elt *register-arg-offsets* n))
24 (make-wired-tn *backend-t-primitive-type*
25 control-stack-arg-scn n)))
28 ;;; Make a passing location TN for a local call return PC. If standard
29 ;;; is true, then use the standard (full call) location, otherwise use
30 ;;; any legal location. Even in the non-standard case, this may be
31 ;;; restricted by a desire to use a subroutine call instruction.
32 (!def-vm-support-routine make-return-pc-passing-location (standard)
34 (make-wired-tn *backend-t-primitive-type* register-arg-scn lra-offset)
35 (make-restricted-tn *backend-t-primitive-type* register-arg-scn)))
37 ;;; This is similar to MAKE-RETURN-PC-PASSING-LOCATION, but makes a
38 ;;; location to pass OLD-FP in. This is (obviously) wired in the
39 ;;; standard convention, but is totally unrestricted in non-standard
40 ;;; conventions, since we can always fetch it off of the stack using
42 (!def-vm-support-routine make-old-fp-passing-location (standard)
44 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn ocfp-offset)
45 (make-normal-tn *fixnum-primitive-type*)))
47 ;;; These functions make the TNs used to hold Old-FP and Return-PC
48 ;;; within the current function. We treat these specially so that the
49 ;;; debugger can find them at a known location.
50 (!def-vm-support-routine make-old-fp-save-location (env)
52 (physenv-debug-live-tn (make-normal-tn *fixnum-primitive-type*) env)
53 (make-wired-tn *fixnum-primitive-type*
56 (!def-vm-support-routine make-return-pc-save-location (env)
57 (let ((ptype *backend-t-primitive-type*))
59 (physenv-debug-live-tn (make-normal-tn ptype) env)
60 (make-wired-tn ptype control-stack-arg-scn lra-save-offset))))
62 ;;; Make a TN for the standard argument count passing location. We
63 ;;; only need to make the standard location, since a count is never
64 ;;; passed when we are using non-standard conventions.
65 (!def-vm-support-routine make-arg-count-location ()
66 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn nargs-offset))
69 ;;; Make a TN to hold the number-stack frame pointer. This is
70 ;;; allocated once per component, and is component-live.
71 (!def-vm-support-routine make-nfp-tn ()
73 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn nfp-offset)))
75 (!def-vm-support-routine make-stack-pointer-tn ()
76 (make-normal-tn *fixnum-primitive-type*))
78 (!def-vm-support-routine make-number-stack-pointer-tn ()
79 (make-normal-tn *fixnum-primitive-type*))
81 ;;; Return a list of TNs that can be used to represent an
82 ;;; unknown-values continuation within a function.
83 (!def-vm-support-routine make-unknown-values-locations ()
84 (list (make-stack-pointer-tn)
85 (make-normal-tn *fixnum-primitive-type*)))
88 ;;; This function is called by the ENTRY-ANALYZE phase, allowing
89 ;;; VM-dependent initialization of the IR2-COMPONENT structure. We
90 ;;; push placeholder entries in the CONSTANTS to leave room for
91 ;;; additional noise in the code object header.
92 (!def-vm-support-routine select-component-format (component)
93 (declare (type component component))
94 (dotimes (i code-constants-offset)
95 (vector-push-extend nil
96 (ir2-component-constants (component-info component))))
102 ;;; Return the number of bytes needed for the current non-descriptor
103 ;;; stack frame. Non-descriptor stack frames must be multiples of 8
104 ;;; bytes on the PMAX.
105 (defun bytes-needed-for-non-descriptor-stack-frame ()
106 (* (logandc2 (1+ (sb-allocated-size 'non-descriptor-stack)) 1)
109 ;;; This is used for setting up the Old-FP in local call.
110 (define-vop (current-fp)
111 (:results (val :scs (any-reg)))
115 ;;; This is used for computing the caller's NFP for use in
116 ;;; known-values return. It only works assuming there is no variable
117 ;;; size stuff on the nstack.
118 (define-vop (compute-old-nfp)
119 (:results (val :scs (any-reg)))
122 (let ((nfp (current-nfp-tn vop)))
124 (inst addq nfp (bytes-needed-for-non-descriptor-stack-frame) val)))))
126 ;;; Accessing a slot from an earlier stack frame is definite hackery.
127 (define-vop (ancestor-frame-ref)
128 (:args (frame-pointer :scs (descriptor-reg))
129 (variable-home-tn :load-if nil))
130 (:results (value :scs (descriptor-reg any-reg)))
133 (aver (sc-is variable-home-tn control-stack))
134 (loadw value frame-pointer (tn-offset variable-home-tn))))
135 (define-vop (ancestor-frame-set)
136 (:args (frame-pointer :scs (descriptor-reg))
137 (value :scs (descriptor-reg any-reg)))
138 (:results (variable-home-tn :load-if nil))
141 (aver (sc-is variable-home-tn control-stack))
142 (storew value frame-pointer (tn-offset variable-home-tn))))
144 (define-vop (xep-allocate-frame)
145 (:info start-lab copy-more-arg-follows)
146 (:ignore copy-more-arg-follows)
148 (:temporary (:scs (non-descriptor-reg)) temp)
150 ;; Make sure the function is aligned, and drop a label pointing to
151 ;; this function header.
152 (emit-alignment n-lowtag-bits)
153 (trace-table-entry trace-table-fun-prologue)
154 (emit-label start-lab)
155 ;; Allocate function header.
156 (inst simple-fun-header-word)
157 (dotimes (i (1- simple-fun-code-offset))
159 ;; The start of the actual code.
160 ;; Compute CODE from the address of this entry point.
161 (let ((entry-point (gen-label)))
162 (emit-label entry-point)
163 (inst compute-code-from-lip code-tn lip-tn entry-point temp)
164 ;; ### We should also save it on the stack so that the garbage
165 ;; collector won't forget about us if we call anyone else.
167 ;; Build our stack frames.
170 (* n-word-bytes (sb-allocated-size 'control-stack))
172 (let ((nfp (current-nfp-tn vop)))
174 (inst subq nsp-tn (bytes-needed-for-non-descriptor-stack-frame)
177 (trace-table-entry trace-table-normal)))
179 (define-vop (allocate-frame)
180 (:results (res :scs (any-reg))
181 (nfp :scs (any-reg)))
184 (trace-table-entry trace-table-fun-prologue)
188 (* n-word-bytes (sb-allocated-size 'control-stack))
190 (when (ir2-physenv-number-stack-p callee)
191 (inst subq nsp-tn (bytes-needed-for-non-descriptor-stack-frame)
194 (trace-table-entry trace-table-normal)))
196 ;;; Allocate a partial frame for passing stack arguments in a full
197 ;;; call. NARGS is the number of arguments passed. If no stack
198 ;;; arguments are passed, then we don't have to do anything.
199 (define-vop (allocate-full-call-frame)
201 (:results (res :scs (any-reg)))
203 (when (> nargs register-arg-count)
205 (inst lda csp-tn (* nargs n-word-bytes) csp-tn))))
207 ;;; Emit code needed at the return-point from an unknown-values call
208 ;;; for a fixed number of values. Values is the head of the TN-REF
209 ;;; list for the locations that the values are to be received into.
210 ;;; Nvals is the number of values that are to be received (should
211 ;;; equal the length of Values).
213 ;;; Move-Temp is a Descriptor-Reg TN used as a temporary.
215 ;;; This code exploits the fact that in the unknown-values convention,
216 ;;; a single value return returns at the return PC + 8, whereas a
217 ;;; return of other than one value returns directly at the return PC.
219 ;;; If 0 or 1 values are expected, then we just emit an instruction to
220 ;;; reset the SP (which will only be executed when other than 1 value
223 ;;; In the general case, we have to do three things:
224 ;;; -- Default unsupplied register values. This need only be done when a
225 ;;; single value is returned, since register values are defaulted by the
226 ;;; called in the non-single case.
227 ;;; -- Default unsupplied stack values. This needs to be done whenever there
228 ;;; are stack values.
229 ;;; -- Reset SP. This must be done whenever other than 1 value is returned,
230 ;;; regardless of the number of values desired.
232 ;;; The general-case code looks like this:
234 b regs-defaulted ; Skip if MVs
237 move a1 null-tn ; Default register values
239 loadi nargs 1 ; Force defaulting of stack values
240 move ocfp csp ; Set up args for SP resetting
243 subu temp nargs register-arg-count
245 bltz temp default-value-7 ; jump to default code
247 loadw move-temp ocfp-tn 6 ; Move value to correct location.
248 store-stack-tn val4-tn move-temp
250 bltz temp default-value-8
252 loadw move-temp ocfp-tn 7
253 store-stack-tn val5-tn move-temp
258 move sp ocfp ; Reset SP.
263 store-stack-tn val4-tn null-tn ; Nil out 7'th value. (first on stack)
266 store-stack-tn val5-tn null-tn ; Nil out 8'th value.
273 (defun default-unknown-values (vop values nvals move-temp temp lra-label)
274 (declare (type (or tn-ref null) values)
275 (type unsigned-byte nvals) (type tn move-temp temp))
278 ;; Note that this is a single-value return point. This is
279 ;; actually the multiple-value entry point for a single
280 ;; desired value, but the code location has to be here, or the
281 ;; debugger backtrace gets confused.
282 (without-scheduling ()
283 (note-this-location vop :single-value-return)
284 (move ocfp-tn csp-tn)
287 (inst compute-code-from-lra code-tn code-tn lra-label temp)))
288 (let ((regs-defaulted (gen-label))
289 (defaulting-done (gen-label))
290 (default-stack-vals (gen-label)))
291 (without-scheduling ()
292 ;; Note that this is an unknown-values return point.
293 (note-this-location vop :unknown-return)
294 ;; If there are no stack results, clear the stack now.
295 (if (> nvals register-arg-count)
296 (inst subq nargs-tn (fixnumize register-arg-count) temp)
297 (move ocfp-tn csp-tn))
298 ;; Branch off to the MV case.
299 (inst br zero-tn regs-defaulted))
301 ;; Do the single value case.
303 (val (tn-ref-across values) (tn-ref-across val)))
304 ((= i (min nvals register-arg-count)))
305 (move null-tn (tn-ref-tn val)))
306 (when (> nvals register-arg-count)
307 (move csp-tn ocfp-tn)
308 (inst br zero-tn default-stack-vals))
310 (emit-label regs-defaulted)
312 (when (> nvals register-arg-count)
313 ;; If there are stack results, we have to default them
314 ;; and clear the stack.
315 (collect ((defaults))
316 (do ((i register-arg-count (1+ i))
317 (val (do ((i 0 (1+ i))
318 (val values (tn-ref-across val)))
319 ((= i register-arg-count) val))
320 (tn-ref-across val)))
323 (let ((default-lab (gen-label))
324 (tn (tn-ref-tn val)))
325 (defaults (cons default-lab tn))
327 (inst ble temp default-lab)
328 (inst ldl move-temp (* i n-word-bytes) ocfp-tn)
329 (inst subq temp (fixnumize 1) temp)
330 (store-stack-tn tn move-temp)))
332 (emit-label defaulting-done)
333 (move ocfp-tn csp-tn)
335 (let ((defaults (defaults)))
337 (assemble (*elsewhere*)
338 (emit-label default-stack-vals)
339 (do ((remaining defaults (cdr remaining)))
341 (let ((def (car remaining)))
342 (emit-label (car def))
343 (store-stack-tn (cdr def) null-tn)))
344 (inst br zero-tn defaulting-done)))))
347 (inst compute-code-from-lra code-tn code-tn lra-label temp))))
350 ;;;; unknown values receiving
352 ;;; Emit code needed at the return point for an unknown-values call
353 ;;; for an arbitrary number of values.
355 ;;; We do the single and non-single cases with no shared code: there
356 ;;; doesn't seem to be any potential overlap, and receiving a single
357 ;;; value is more important efficiency-wise.
359 ;;; When there is a single value, we just push it on the stack,
360 ;;; returning the old SP and 1.
362 ;;; When there is a variable number of values, we move all of the
363 ;;; argument registers onto the stack, and return Args and Nargs.
365 ;;; Args and Nargs are TNs wired to the named locations. We must
366 ;;; explicitly allocate these TNs, since their lifetimes overlap with
367 ;;; the results Start and Count (also, it's nice to be able to target
369 (defun receive-unknown-values (args nargs start count lra-label temp)
370 (declare (type tn args nargs start count temp))
371 (let ((variable-values (gen-label))
373 (without-scheduling ()
374 (inst br zero-tn variable-values)
378 (inst compute-code-from-lra code-tn code-tn lra-label temp))
379 (inst addq csp-tn 4 csp-tn)
380 (storew (first *register-arg-tns*) csp-tn -1)
381 (inst subq csp-tn 4 start)
382 (inst li (fixnumize 1) count)
386 (assemble (*elsewhere*)
387 (emit-label variable-values)
389 (inst compute-code-from-lra code-tn code-tn lra-label temp))
390 (do ((arg *register-arg-tns* (rest arg))
393 (storew (first arg) args i))
396 (inst br zero-tn done)))
399 ;;; a VOP that can be inherited by unknown values receivers. The main
400 ;;; thing this handles is allocation of the result temporaries.
401 (define-vop (unknown-values-receiver)
403 (start :scs (any-reg))
404 (count :scs (any-reg)))
405 (:temporary (:sc descriptor-reg :offset ocfp-offset
406 :from :eval :to (:result 0))
408 (:temporary (:sc any-reg :offset nargs-offset
409 :from :eval :to (:result 1))
411 (:temporary (:scs (non-descriptor-reg)) temp))
413 ;;;; local call with unknown values convention return
415 ;;; Non-TR local call for a fixed number of values passed according to the
416 ;;; unknown values convention.
418 ;;; Args are the argument passing locations, which are specified only to
419 ;;; terminate their lifetimes in the caller.
421 ;;; Values are the return value locations (wired to the standard passing
424 ;;; Save is the save info, which we can ignore since saving has been
425 ;;; done. Return-PC is the TN that the return PC should be passed in.
426 ;;; Target is a continuation pointing to the start of the called
427 ;;; function. Nvals is the number of values received.
429 ;;; Note: we can't use normal load-tn allocation for the fixed args,
430 ;;; since all registers may be tied up by the more operand. Instead,
431 ;;; we use MAYBE-LOAD-STACK-TN.
432 (define-vop (call-local)
436 (:results (values :more t))
438 (:move-args :local-call)
439 (:info arg-locs callee target nvals)
441 (:temporary (:scs (descriptor-reg) :from :eval) move-temp)
442 (:temporary (:scs (non-descriptor-reg)) temp)
443 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
444 (:temporary (:sc any-reg :offset ocfp-offset :from :eval) ocfp)
445 (:ignore arg-locs args ocfp)
447 (let ((label (gen-label))
448 (cur-nfp (current-nfp-tn vop)))
450 (store-stack-tn nfp-save cur-nfp))
451 (let ((callee-nfp (callee-nfp-tn callee)))
452 (maybe-load-stack-nfp-tn callee-nfp nfp temp))
453 (maybe-load-stack-tn cfp-tn fp)
454 (trace-table-entry trace-table-call-site)
455 (inst compute-lra-from-code
456 (callee-return-pc-tn callee) code-tn label temp)
457 (note-this-location vop :call-site)
458 (inst br zero-tn target)
459 (trace-table-entry trace-table-normal)
460 (emit-return-pc label)
461 (default-unknown-values vop values nvals move-temp temp label)
462 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp))))
465 ;;; Non-TR local call for a variable number of return values passed
466 ;;; according to the unknown values convention. The results are the
467 ;;; start of the values glob and the number of values received.
469 ;;; Note: we can't use normal load-tn allocation for the fixed args,
470 ;;; since all registers may be tied up by the more operand. Instead,
471 ;;; we use MAYBE-LOAD-STACK-TN.
472 (define-vop (multiple-call-local unknown-values-receiver)
477 (:move-args :local-call)
478 (:info save callee target)
481 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
482 (:temporary (:scs (non-descriptor-reg)) temp)
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)))
489 (maybe-load-stack-nfp-tn callee-nfp nfp temp))
490 (maybe-load-stack-tn cfp-tn fp)
491 (trace-table-entry trace-table-call-site)
492 (inst compute-lra-from-code
493 (callee-return-pc-tn callee) code-tn label temp)
494 (note-this-location vop :call-site)
495 (inst bsr zero-tn target)
496 (trace-table-entry trace-table-normal)
497 (emit-return-pc label)
498 (note-this-location vop :unknown-return)
499 (receive-unknown-values values-start nvals start count label temp)
500 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp))))
503 ;;;; local call with known values return
505 ;;; Non-TR local call with known return locations. Known-value return
506 ;;; works just like argument passing in local call.
508 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
509 ;;; registers may be tied up by the more operand. Instead, we use
510 ;;; MAYBE-LOAD-STACK-TN.
511 (define-vop (known-call-local)
515 (:results (res :more t))
516 (:move-args :local-call)
518 (:info save callee target)
519 (:ignore args res save)
521 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
522 (:temporary (:scs (non-descriptor-reg)) temp)
524 (let ((label (gen-label))
525 (cur-nfp (current-nfp-tn vop)))
527 (store-stack-tn nfp-save cur-nfp))
528 (let ((callee-nfp (callee-nfp-tn callee)))
529 (maybe-load-stack-nfp-tn callee-nfp nfp temp))
530 (maybe-load-stack-tn cfp-tn fp)
531 (trace-table-entry trace-table-call-site)
532 (inst compute-lra-from-code
533 (callee-return-pc-tn callee) code-tn label temp)
534 (note-this-location vop :call-site)
535 (inst bsr zero-tn target)
536 (trace-table-entry trace-table-normal)
537 (emit-return-pc label)
538 (note-this-location vop :known-return)
539 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp))))
541 ;;; Return from known values call. We receive the return locations as
542 ;;; arguments to terminate their lifetimes in the returning function.
543 ;;; We restore FP and CSP and jump to the Return-PC.
545 ;;; Note: we can't use normal load-tn allocation for the fixed args,
546 ;;; since all registers may be tied up by the more operand. Instead,
547 ;;; we use MAYBE-LOAD-STACK-TN.
548 (define-vop (known-return)
549 (:args (ocfp :target ocfp-temp)
550 (return-pc :target return-pc-temp)
552 (:temporary (:sc any-reg :from (:argument 0)) ocfp-temp)
553 (:temporary (:sc any-reg :from (:argument 1))
555 (:temporary (:scs (interior-reg)) lip)
556 (:move-args :known-return)
558 (:ignore val-locs vals)
561 (trace-table-entry trace-table-fun-epilogue)
562 (maybe-load-stack-tn ocfp-temp ocfp)
563 (maybe-load-stack-tn return-pc-temp return-pc)
565 (let ((cur-nfp (current-nfp-tn vop)))
567 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
569 (inst subq return-pc-temp (- other-pointer-lowtag n-word-bytes) lip)
570 (move ocfp-temp cfp-tn)
571 (inst ret zero-tn lip 1)
572 (trace-table-entry trace-table-normal)))
576 ;;;; There is something of a cross-product effect with full calls.
577 ;;;; Different versions are used depending on whether we know the
578 ;;;; number of arguments or the name of the called function, and
579 ;;;; whether we want fixed values, unknown values, or a tail call.
581 ;;;; In full call, the arguments are passed creating a partial frame on
582 ;;;; the stack top and storing stack arguments into that frame. On
583 ;;;; entry to the callee, this partial frame is pointed to by FP. If
584 ;;;; there are no stack arguments, we don't bother allocating a partial
585 ;;;; frame, and instead set FP to SP just before the call.
587 ;;; This macro helps in the definition of full call VOPs by avoiding
588 ;;; code replication in defining the cross-product VOPs.
590 ;;; Name is the name of the VOP to define.
592 ;;; Named is true if the first argument is a symbol whose global
593 ;;; function definition is to be called.
595 ;;; Return is either :FIXED, :UNKNOWN or :TAIL:
596 ;;; -- If :FIXED, then the call is for a fixed number of values, returned
597 ;;; in the standard passing locations (passed as result operands).
598 ;;; -- If :UNKNOWN, then the result values are pushed on the stack, and
599 ;;; the result values are specified by the Start and Count as in the
600 ;;; unknown-values continuation representation.
601 ;;; -- If :TAIL, then do a tail-recursive call. No values are returned.
602 ;;; The Ocfp and Return-PC are passed as the second and third arguments.
604 ;;; In non-tail calls, the pointer to the stack arguments is passed as
605 ;;; the last fixed argument. If Variable is false, then the passing
606 ;;; locations are passed as a more arg. Variable is true if there are
607 ;;; a variable number of arguments passed on the stack. Variable
608 ;;; cannot be specified with :TAIL return. TR variable argument call
609 ;;; is implemented separately.
611 ;;; In tail call with fixed arguments, the passing locations are
612 ;;; passed as a more arg, but there is no new-FP, since the arguments
613 ;;; have been set up in the current frame.
614 (defmacro define-full-call (name named return variable)
615 (aver (not (and variable (eq return :tail))))
617 ,@(when (eq return :unknown)
618 '(unknown-values-receiver)))
620 ,@(unless (eq return :tail)
621 '((new-fp :scs (any-reg) :to :eval)))
624 '(name :target name-pass)
625 '(arg-fun :target lexenv))
627 ,@(when (eq return :tail)
628 '((ocfp :target ocfp-pass)
629 (return-pc :target return-pc-pass)))
631 ,@(unless variable '((args :more t :scs (descriptor-reg)))))
633 ,@(when (eq return :fixed)
634 '((:results (values :more t))))
636 (:save-p ,(if (eq return :tail) :compute-only t))
638 ,@(unless (or (eq return :tail) variable)
639 '((:move-args :full-call)))
642 (:info ,@(unless (or variable (eq return :tail)) '(arg-locs))
643 ,@(unless variable '(nargs))
644 ,@(when (eq return :fixed) '(nvals))
647 (:ignore #!+gengc ,@(unless (eq return :tail) '(return-pc-pass))
648 ,@(unless (or variable (eq return :tail)) '(arg-locs))
649 ,@(unless variable '(args))
650 ;; Step instrumentation for full calls not implemented yet.
651 ;; See the PPC backend for an example.
654 (:temporary (:sc descriptor-reg
657 ,@(unless (eq return :fixed)
661 (:temporary (:sc descriptor-reg
662 :offset #!-gengc lra-offset #!+gengc ra-offset
663 :from (:argument ,(if (eq return :tail) 2 1))
668 `((:temporary (:sc descriptor-reg :offset fdefn-offset
669 :from (:argument ,(if (eq return :tail) 0 1))
673 `((:temporary (:sc descriptor-reg :offset lexenv-offset
674 :from (:argument ,(if (eq return :tail) 0 1))
678 (:temporary (:scs (descriptor-reg) :from (:argument 0) :to :eval)
681 (:temporary (:sc any-reg :offset nargs-offset :to :eval)
685 (mapcar (lambda (name offset)
686 `(:temporary (:sc descriptor-reg
690 register-arg-names *register-arg-offsets*))
691 ,@(when (eq return :fixed)
692 '((:temporary (:scs (descriptor-reg) :from :eval) move-temp)))
694 ,@(unless (eq return :tail)
695 '((:temporary (:scs (non-descriptor-reg)) temp)
696 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)))
698 (:temporary (:sc interior-reg :offset lip-offset) entry-point)
700 (:generator ,(+ (if named 5 0)
702 (if (eq return :tail) 0 10)
704 (if (eq return :unknown) 25 0))
705 (let* ((cur-nfp (current-nfp-tn vop))
706 ,@(unless (eq return :tail)
707 '((lra-label (gen-label))))
711 ,@(if (eq return :tail)
712 '((unless (location= ocfp ocfp-pass)
714 (unless (location= return-pc
725 (flet ((do-next-filler ()
726 (let* ((next (pop filler))
727 (what (if (consp next) (car next) next)))
731 `((inst subq csp-tn new-fp nargs-pass)
733 (mapcar (lambda (name)
738 register-arg-names)))
739 '((inst li (fixnumize nargs) nargs-pass))))
740 ,@(if (eq return :tail)
744 (inst move ocfp ocfp-pass))
747 (ash (tn-offset ocfp)
752 (#!-gengc descriptor-reg #!+gengc any-reg
753 (inst move return-pc return-pc-pass))
755 (inst ldl return-pc-pass
756 (ash (tn-offset return-pc)
761 (bytes-needed-for-non-descriptor-stack-frame)
765 (inst compute-lra-from-code
766 return-pc-pass code-tn lra-label temp))
768 (store-stack-tn nfp-save cur-nfp))
770 (inst move cfp-tn ocfp-pass))
773 '(move new-fp cfp-tn)
774 '(if (> nargs register-arg-count)
776 (move csp-tn cfp-tn)))
777 (trace-table-entry trace-table-call-site))))
782 (descriptor-reg (move name name-pass))
785 (ash (tn-offset name) word-shift) cfp-tn)
789 (- (ash (tn-offset name) word-shift)
790 other-pointer-lowtag) code-tn)
792 (inst ldl entry-point
793 (- (ash fdefn-raw-addr-slot word-shift)
794 other-pointer-lowtag) name-pass)
797 (descriptor-reg (move arg-fun lexenv))
800 (ash (tn-offset arg-fun) word-shift) cfp-tn)
804 (- (ash (tn-offset arg-fun) word-shift)
805 other-pointer-lowtag) code-tn)
809 (- (ash closure-fun-slot word-shift)
810 fun-pointer-lowtag) lexenv)
815 (- (ash simple-fun-code-offset word-shift)
816 fun-pointer-lowtag) entry-point)
818 (inst ldl entry-point
819 (- (ash closure-entry-point-slot word-shift)
820 fun-pointer-lowtag) lexenv)
828 (note-this-location vop :call-site)
830 (inst jsr zero-tn entry-point))
834 '((trace-table-entry trace-table-normal)
835 (emit-return-pc lra-label)
836 (default-unknown-values vop values nvals
837 move-temp temp lra-label)
838 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp)))
840 '((trace-table-entry trace-table-normal)
841 (emit-return-pc lra-label)
842 (note-this-location vop :unknown-return)
843 (receive-unknown-values values-start nvals start count
845 (maybe-load-stack-nfp-tn cur-nfp nfp-save temp)))
848 (define-full-call call nil :fixed nil)
849 (define-full-call call-named t :fixed nil)
850 (define-full-call multiple-call nil :unknown nil)
851 (define-full-call multiple-call-named t :unknown nil)
852 (define-full-call tail-call nil :tail nil)
853 (define-full-call tail-call-named t :tail nil)
855 (define-full-call call-variable nil :fixed t)
856 (define-full-call multiple-call-variable nil :unknown t)
858 ;;; This is defined separately, since it needs special code that blits
859 ;;; the arguments down.
860 (define-vop (tail-call-variable)
862 (args-arg :scs (any-reg) :target args)
863 (function-arg :scs (descriptor-reg) :target lexenv)
864 (ocfp-arg :scs (any-reg) :target ocfp)
865 (lra-arg :scs (#!-gengc descriptor-reg #!+gengc any-reg) :target lra))
867 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 0)) args)
868 (:temporary (:sc any-reg :offset lexenv-offset :from (:argument 1)) lexenv)
869 (:temporary (:sc any-reg :offset ocfp-offset :from (:argument 2)) ocfp)
870 (:temporary (:sc any-reg :offset #!-gengc lra-offset #!+gengc ra-offset
871 :from (:argument 3)) lra)
872 (:temporary (:scs (non-descriptor-reg)) temp)
878 ;; Move these into the passing locations if they are not already there.
880 (move function-arg lexenv)
884 ;; Clear the number stack if anything is there.
885 (let ((cur-nfp (current-nfp-tn vop)))
887 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
890 ;; And jump to the assembly-routine that does the bliting.
891 (inst li (make-fixup 'tail-call-variable :assembly-routine) temp)
892 (inst jmp zero-tn temp)))
894 ;;;; unknown values return
896 ;;; Return a single value using the unknown-values convention.
897 (define-vop (return-single)
898 (:args (ocfp :scs (any-reg))
899 #!-gengc (return-pc :scs (descriptor-reg))
900 #!+gengc (return-pc :scs (any-reg) :target ra)
903 #!-gengc (:temporary (:scs (interior-reg)) lip)
904 #!+gengc (:temporary (:sc any-reg :offset ra-offset :from (:argument 1)) ra)
905 #!+gengc (:temporary (:scs (any-reg) :from (:argument 1)) temp)
908 ;; Clear the number stack.
909 (trace-table-entry trace-table-fun-epilogue)
910 (let ((cur-nfp (current-nfp-tn vop)))
912 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
914 ;; Clear the control stack, and restore the frame pointer.
918 #!-gengc (lisp-return return-pc lip :offset 2)
921 (inst addq return-pc (* 2 n-word-bytes) temp)
922 (unless (location= ra return-pc)
923 (inst move ra return-pc))
924 (inst ret zero-tn temp 1))
925 (trace-table-entry trace-table-normal)))
927 ;;; Do unknown-values return of a fixed number of values. The Values
928 ;;; are required to be set up in the standard passing locations. Nvals
929 ;;; is the number of values returned.
931 ;;; If returning a single value, then deallocate the current frame,
932 ;;; restore FP and jump to the single-value entry at Return-PC + 8.
934 ;;; If returning other than one value, then load the number of values
935 ;;; returned, NIL out unsupplied values registers, restore FP and
936 ;;; return at Return-PC. When there are stack values, we must
937 ;;; initialize the argument pointer to point to the beginning of the
938 ;;; values block (which is the beginning of the current frame.)
940 (:args (ocfp :scs (any-reg))
941 (return-pc :scs (#!-gengc descriptor-reg #!+gengc any-reg)
943 #!+gengc :target #!+gengc ra)
947 (:temporary (:sc descriptor-reg :offset a0-offset :from (:eval 0)) a0)
948 (:temporary (:sc descriptor-reg :offset a1-offset :from (:eval 0)) a1)
949 (:temporary (:sc descriptor-reg :offset a2-offset :from (:eval 0)) a2)
950 (:temporary (:sc descriptor-reg :offset a3-offset :from (:eval 0)) a3)
951 (:temporary (:sc descriptor-reg :offset a4-offset :from (:eval 0)) a4)
952 (:temporary (:sc descriptor-reg :offset a5-offset :from (:eval 0)) a5)
953 (:temporary (:sc any-reg :offset nargs-offset) nargs)
954 (:temporary (:sc any-reg :offset ocfp-offset) val-ptr)
955 #!-gengc (:temporary (:scs (interior-reg)) lip)
956 #!+gengc (:temporary (:sc any-reg :offset ra-offset :from (:eval 1)) ra)
959 ;; Clear the number stack.
960 (trace-table-entry trace-table-fun-epilogue)
961 (let ((cur-nfp (current-nfp-tn vop)))
963 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
965 ;; Establish the values pointer and values count.
966 (move cfp-tn val-ptr)
967 (inst li (fixnumize nvals) nargs)
968 ;; restore the frame pointer and clear as much of the control
969 ;; stack as possible.
971 ;; ADDQ only accepts immediates of type (UNSIGNED-BYTE 8). Here,
972 ;; instead of adding (* NVALS N-WORD-BYTES), we use NARGS that
973 ;; we've carefully set up, but protect ourselves by averring that
974 ;; FIXNUMIZEation and multiplication by N-WORD-BYTES is the same.
975 (aver (= (* nvals n-word-bytes) (fixnumize nvals)))
976 (inst addq val-ptr nargs csp-tn)
977 ;; pre-default any argument register that need it.
978 (when (< nvals register-arg-count)
979 (dolist (reg (subseq (list a0 a1 a2 a3 a4 a5) nvals))
982 (lisp-return return-pc lip)
983 (trace-table-entry trace-table-normal)))
985 ;;; Do unknown-values return of an arbitrary number of values (passed
986 ;;; on the stack.) We check for the common case of a single return
987 ;;; value, and do that inline using the normal single value return
988 ;;; convention. Otherwise, we branch off to code that calls an
989 ;;; assembly-routine.
990 (define-vop (return-multiple)
991 (:args (ocfp-arg :scs (any-reg) :target ocfp)
992 #!-gengc (lra-arg :scs (descriptor-reg) :target lra)
993 #!+gengc (return-pc :scs (any-reg) :target ra)
994 (vals-arg :scs (any-reg) :target vals)
995 (nvals-arg :scs (any-reg) :target nvals))
997 (:temporary (:sc any-reg :offset nl1-offset :from (:argument 0)) ocfp)
999 (:temporary (:sc descriptor-reg :offset lra-offset :from (:argument 1)) lra)
1001 (:temporary (:sc any-reg :offset ra-offset :from (:argument 1)) ra)
1002 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 2)) vals)
1003 (:temporary (:sc any-reg :offset nargs-offset :from (:argument 3)) nvals)
1004 (:temporary (:sc descriptor-reg :offset a0-offset) a0)
1005 (:temporary (:scs (non-descriptor-reg)) temp)
1006 #!-gengc (:temporary (:scs (interior-reg)) lip)
1007 #!+gengc (:temporary (:scs (any-reg) :from (:argument 0)) temp)
1012 (trace-table-entry trace-table-fun-epilogue)
1013 (let ((not-single (gen-label)))
1014 ;; Clear the number stack.
1015 (let ((cur-nfp (current-nfp-tn vop)))
1017 (inst addq cur-nfp (bytes-needed-for-non-descriptor-stack-frame)
1020 ;; Check for the single case.
1021 (inst li (fixnumize 1) a0)
1022 (inst cmpeq nvals-arg a0 temp)
1023 (inst ldl a0 0 vals-arg)
1024 (inst beq temp not-single)
1026 ;; Return with one value.
1027 (move cfp-tn csp-tn)
1028 (move ocfp-arg cfp-tn)
1029 (lisp-return lra-arg lip :offset 2)
1031 ;; Nope, not the single case.
1032 (emit-label not-single)
1033 (move ocfp-arg ocfp)
1035 (move vals-arg vals)
1036 (move nvals-arg nvals)
1037 (inst li (make-fixup 'return-multiple :assembly-routine) temp)
1038 (inst jmp zero-tn temp))
1039 (trace-table-entry trace-table-normal)))
1043 ;;; We don't need to do anything special for regular functions.
1044 (define-vop (setup-environment)
1048 ;; Don't bother doing anything.
1051 ;;; Get the lexical environment from its passing location.
1052 (define-vop (setup-closure-environment)
1053 (:temporary (:sc descriptor-reg :offset lexenv-offset :target closure
1056 (:results (closure :scs (descriptor-reg)))
1061 (move lexenv closure)))
1063 ;;; Copy a &MORE arg from the argument area to the end of the current
1064 ;;; frame. FIXED is the number of non-&MORE arguments.
1065 (define-vop (copy-more-arg)
1066 (:temporary (:sc any-reg :offset nl0-offset) result)
1067 (:temporary (:sc any-reg :offset nl1-offset) count)
1068 (:temporary (:sc any-reg :offset nl2-offset) src)
1069 (:temporary (:sc any-reg :offset nl4-offset) dst)
1070 (:temporary (:sc descriptor-reg :offset l0-offset) temp)
1073 (let ((loop (gen-label))
1074 (do-regs (gen-label))
1076 (when (< fixed register-arg-count)
1077 ;; Save a pointer to the results so we can fill in register
1078 ;; args. We don't need this if there are more fixed args than
1080 (move csp-tn result))
1081 ;; Allocate the space on the stack.
1082 (cond ((zerop fixed)
1083 (inst addq csp-tn nargs-tn csp-tn)
1084 (inst beq nargs-tn done))
1086 (inst subq nargs-tn (fixnumize fixed) count)
1087 (inst ble count done)
1088 (inst addq csp-tn count csp-tn)))
1089 (when (< fixed register-arg-count)
1090 ;; We must stop when we run out of stack args, not when we run
1091 ;; out of &MORE args.
1092 (inst subq nargs-tn (fixnumize register-arg-count) count))
1093 ;; Initialize dst to be end of stack.
1095 ;; Everything of interest in registers.
1096 (inst ble count do-regs)
1097 ;; Initialize SRC to be end of args.
1098 (inst addq cfp-tn nargs-tn src)
1101 ;; *--dst = *--src, --count
1102 (inst subq src n-word-bytes src)
1103 (inst subq count (fixnumize 1) count)
1105 (inst subq dst n-word-bytes dst)
1107 (inst bgt count loop)
1109 (emit-label do-regs)
1110 (when (< fixed register-arg-count)
1111 ;; Now we have to deposit any more args that showed up in
1112 ;; registers. We know there is at least one &MORE arg,
1113 ;; otherwise we would have branched to DONE up at the top.
1114 (inst subq nargs-tn (fixnumize (1+ fixed)) count)
1115 (do ((i fixed (1+ i)))
1116 ((>= i register-arg-count))
1117 ;; Store it relative to the pointer saved at the start.
1118 (storew (nth i *register-arg-tns*) result (- i fixed))
1119 ;; Is this the last one?
1120 (inst beq count done)
1122 (inst subq count (fixnumize 1) count)))
1123 (emit-label done))))
1125 ;;; &MORE args are stored consecutively on the stack, starting
1126 ;;; immediately at the context pointer. The context pointer is not
1127 ;;; typed, so the lowtag is 0.
1128 (define-full-reffer more-arg * 0 0 (descriptor-reg any-reg) * %more-arg)
1130 ;;; Turn &MORE arg (context, count) into a list.
1131 (define-vop (listify-rest-args)
1132 (:args (context-arg :target context :scs (descriptor-reg))
1133 (count-arg :target count :scs (any-reg)))
1134 (:arg-types * tagged-num)
1135 (:temporary (:scs (any-reg) :from (:argument 0)) context)
1136 (:temporary (:scs (any-reg) :from (:argument 1)) count)
1137 (:temporary (:scs (descriptor-reg) :from :eval) temp dst)
1138 (:results (result :scs (descriptor-reg)))
1139 (:translate %listify-rest-args)
1143 (let* ((enter (gen-label))
1146 (dx-p (node-stack-allocate-p node))
1147 (alloc-area-tn (if dx-p csp-tn alloc-tn)))
1148 (move context-arg context)
1149 (move count-arg count)
1150 ;; Check to see if there are any arguments.
1151 (move null-tn result)
1152 (inst beq count done)
1154 ;; We need to do this atomically.
1157 (when dx-p (align-csp temp))
1158 ;; Allocate a cons (2 words) for each item.
1159 (inst bis alloc-area-tn list-pointer-lowtag result)
1161 (inst sll count 1 temp)
1162 (inst addq alloc-area-tn temp alloc-area-tn)
1163 (inst br zero-tn enter)
1165 ;; Store the current cons in the cdr of the previous cons.
1167 (inst addq dst (* 2 n-word-bytes) dst)
1168 (storew dst dst -1 list-pointer-lowtag)
1172 (loadw temp context)
1173 (inst addq context n-word-bytes context)
1175 ;; Store the value in the car (in delay slot)
1176 (storew temp dst 0 list-pointer-lowtag)
1178 ;; Decrement count, and if != zero, go back for more.
1179 (inst subq count (fixnumize 1) count)
1180 (inst bne count loop)
1182 ;; NIL out the last cons.
1183 (storew null-tn dst 1 list-pointer-lowtag))
1184 (emit-label done))))
1186 ;;; Return the location and size of the &MORE arg glob created by
1187 ;;; COPY-MORE-ARG. Supplied is the total number of arguments supplied
1188 ;;; (originally passed in NARGS.) Fixed is the number of non-&rest
1191 ;;; We must duplicate some of the work done by COPY-MORE-ARG, since at
1192 ;;; that time the environment is in a pretty brain-damaged state,
1193 ;;; preventing this info from being returned as values. What we do is
1194 ;;; compute supplied - fixed, and return a pointer that many words
1195 ;;; below the current stack top.
1196 (define-vop (more-arg-context)
1197 (:policy :fast-safe)
1198 (:translate sb!c::%more-arg-context)
1199 (:args (supplied :scs (any-reg)))
1200 (:arg-types tagged-num (:constant fixnum))
1202 (:results (context :scs (descriptor-reg))
1203 (count :scs (any-reg)))
1204 (:result-types t tagged-num)
1205 (:note "more-arg-context")
1207 (inst subq supplied (fixnumize fixed) count)
1208 (inst subq csp-tn count context)))
1210 ;;; Signal wrong argument count error if NARGS isn't equal to COUNT.
1211 (define-vop (verify-arg-count)
1212 (:policy :fast-safe)
1213 (:translate sb!c::%verify-arg-count)
1214 (:args (nargs :scs (any-reg)))
1215 (:arg-types positive-fixnum (:constant t))
1216 (:temporary (:scs (any-reg) :type fixnum) temp)
1219 (:save-p :compute-only)
1222 (generate-error-code vop invalid-arg-count-error nargs)))
1223 (cond ((zerop count)
1224 (inst bne nargs err-lab))
1226 (inst subq nargs (fixnumize count) temp)
1227 (inst bne temp err-lab))))))
1229 ;;; various other error signalers
1230 (macrolet ((frob (name error translate &rest args)
1231 `(define-vop (,name)
1233 `((:policy :fast-safe)
1234 (:translate ,translate)))
1235 (:args ,@(mapcar (lambda (arg)
1236 `(,arg :scs (any-reg descriptor-reg)))
1239 (:save-p :compute-only)
1241 (error-call vop ,error ,@args)))))
1242 (frob arg-count-error invalid-arg-count-error
1243 sb!c::%arg-count-error nargs)
1244 (frob type-check-error object-not-type-error sb!c::%type-check-error
1246 (frob layout-invalid-error layout-invalid-error sb!c::%layout-invalid-error
1248 (frob odd-key-args-error odd-key-args-error
1249 sb!c::%odd-key-args-error)
1250 (frob unknown-key-arg-error unknown-key-arg-error
1251 sb!c::%unknown-key-arg-error key)
1252 (frob nil-fun-returned-error nil-fun-returned-error nil fun))
1256 (define-vop (step-instrument-before-vop)
1257 (:policy :fast-safe)
1260 ;; Stub! See the PPC backend for an example.
1261 (note-this-location vop :step-before-vop)))