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 ;;; Return the number of bytes needed for the current non-descriptor stack
103 ;;; frame. Non-descriptor stack frames must be multiples of 16 bytes under
104 ;;; the PPC SVr4 ABI (though the EABI may be less restrictive.) Two words
105 ;;; are reserved for the stack backlink and saved LR (see SB!VM::NUMBER-STACK-
108 ;;; Duh. PPC Linux (and VxWorks) adhere to the EABI.
110 ;;; this is the first function in this file that differs materially from
111 ;;; ../alpha/call.lisp
112 (defun bytes-needed-for-non-descriptor-stack-frame ()
113 (logandc2 (+ 7 number-stack-displacement
114 (* (sb-allocated-size 'non-descriptor-stack) sb!vm:n-word-bytes))
118 ;;; Used for setting up the Old-FP in local call.
120 (define-vop (current-fp)
121 (:results (val :scs (any-reg)))
125 ;;; Used for computing the caller's NFP for use in known-values return. Only
126 ;;; works assuming there is no variable size stuff on the nstack.
128 (define-vop (compute-old-nfp)
129 (:results (val :scs (any-reg)))
132 (let ((nfp (current-nfp-tn vop)))
134 (inst addi val nfp (bytes-needed-for-non-descriptor-stack-frame))))))
137 (define-vop (xep-allocate-frame)
138 (:info start-lab copy-more-arg-follows)
139 (:ignore copy-more-arg-follows)
141 (:temporary (:scs (non-descriptor-reg)) temp)
143 ;; Make sure the function is aligned, and drop a label pointing to this
145 (align n-lowtag-bits)
146 (trace-table-entry trace-table-fun-prologue)
147 (emit-label start-lab)
148 ;; Allocate function header.
149 (inst simple-fun-header-word)
150 (dotimes (i (1- sb!vm:simple-fun-code-offset))
152 (let* ((entry-point (gen-label)))
153 (emit-label entry-point)
154 (inst compute-code-from-fn code-tn lip-tn entry-point temp))
155 ;; FIXME alpha port has a ### note here saying we should "save it
156 ;; on the stack" so that GC sees it. No idea what "it" is -dan 20020110
157 ;; Build our stack frames.
158 (inst addi csp-tn cfp-tn
159 (* n-word-bytes (sb-allocated-size 'control-stack)))
160 (let ((nfp-tn (current-nfp-tn vop)))
162 (let* ((nbytes (bytes-needed-for-non-descriptor-stack-frame)))
163 (when (> nbytes number-stack-displacement)
164 (inst stwu nsp-tn nsp-tn (- nbytes))
165 (inst addi nfp-tn nsp-tn number-stack-displacement)))))
166 (trace-table-entry trace-table-normal)))
168 (define-vop (allocate-frame)
169 (:results (res :scs (any-reg))
170 (nfp :scs (any-reg)))
173 (trace-table-entry trace-table-fun-prologue)
175 (inst addi csp-tn csp-tn
176 (* n-word-bytes (sb-allocated-size 'control-stack)))
177 (when (ir2-physenv-number-stack-p callee)
178 (let* ((nbytes (bytes-needed-for-non-descriptor-stack-frame)))
179 (when (> nbytes number-stack-displacement)
180 (inst stwu nsp-tn nsp-tn (- (bytes-needed-for-non-descriptor-stack-frame)))
181 (inst addi nfp nsp-tn number-stack-displacement))))
182 (trace-table-entry trace-table-normal)))
184 ;;; Allocate a partial frame for passing stack arguments in a full call. Nargs
185 ;;; is the number of arguments passed. If no stack arguments are passed, then
186 ;;; we don't have to do anything.
188 (define-vop (allocate-full-call-frame)
190 (:results (res :scs (any-reg)))
192 (when (> nargs register-arg-count)
194 (inst addi csp-tn csp-tn (* nargs n-word-bytes)))))
197 ;;; Emit code needed at the return-point from an unknown-values call
198 ;;; for a fixed number of values. Values is the head of the TN-REF
199 ;;; list for the locations that the values are to be received into.
200 ;;; Nvals is the number of values that are to be received (should
201 ;;; equal the length of Values).
203 ;;; MOVE-TEMP is a DESCRIPTOR-REG TN used as a temporary.
205 ;;; This code exploits the fact that in the unknown-values convention,
206 ;;; a single value return returns at the return PC + 8, whereas a
207 ;;; return of other than one value returns directly at the return PC.
209 ;;; If 0 or 1 values are expected, then we just emit an instruction to
210 ;;; reset the SP (which will only be executed when other than 1 value
213 ;;; In the general case, we have to do three things:
214 ;;; -- Default unsupplied register values. This need only be done when a
215 ;;; single value is returned, since register values are defaulted by the
216 ;;; callee in the non-single case.
217 ;;; -- Default unsupplied stack values. This needs to be done whenever there
218 ;;; are stack values.
219 ;;; -- Reset SP. This must be done whenever other than 1 value is returned,
220 ;;; regardless of the number of values desired.
222 ;;; The general-case code looks like this:
224 b regs-defaulted ; Skip if MVs
227 move a1 null-tn ; Default register values
229 loadi nargs 1 ; Force defaulting of stack values
230 move old-fp csp ; Set up args for SP resetting
233 subcc temp nargs register-arg-count
235 b :lt default-value-7 ; jump to default code
236 loadw move-temp ocfp-tn 6 ; Move value to correct location.
238 store-stack-tn val4-tn move-temp
240 b :lt default-value-8
241 loadw move-temp ocfp-tn 7
243 store-stack-tn val5-tn move-temp
248 move csp ocfp ; Reset SP.
253 store-stack-tn val4-tn null-tn ; Nil out 7'th value. (first on stack)
256 store-stack-tn val5-tn null-tn ; Nil out 8'th value.
263 ;;; differences from alpha: (1) alpha tests for lra-label before
264 ;;; compute-code-from-lra and skips if nil. (2) loop termination is
265 ;;; different when clearing stack defaults
267 (defun default-unknown-values (vop values nvals move-temp temp lra-label)
268 (declare (type (or tn-ref null) values)
269 (type unsigned-byte nvals) (type tn move-temp temp))
272 (sb!assem:without-scheduling ()
273 (note-this-location vop :single-value-return)
274 (move csp-tn ocfp-tn)
276 (inst compute-code-from-lra code-tn code-tn lra-label temp))
277 (let ((regs-defaulted (gen-label))
278 (defaulting-done (gen-label))
279 (default-stack-vals (gen-label)))
280 ;; Branch off to the MV case.
281 (sb!assem:without-scheduling ()
282 (note-this-location vop :unknown-return)
283 (if (> nvals register-arg-count)
284 (inst addic. temp nargs-tn (- (fixnumize register-arg-count)))
285 (move csp-tn ocfp-tn))
286 (inst b regs-defaulted))
288 ;; Do the single value case.
290 (val (tn-ref-across values) (tn-ref-across val)))
291 ((= i (min nvals register-arg-count)))
292 (move (tn-ref-tn val) null-tn))
293 (when (> nvals register-arg-count)
294 (move ocfp-tn csp-tn)
295 (inst b default-stack-vals))
297 (emit-label regs-defaulted)
298 (when (> nvals register-arg-count)
299 (collect ((defaults))
300 (do ((i register-arg-count (1+ i))
301 (val (do ((i 0 (1+ i))
302 (val values (tn-ref-across val)))
303 ((= i register-arg-count) val))
304 (tn-ref-across val)))
307 (let ((default-lab (gen-label))
308 (tn (tn-ref-tn val)))
309 (defaults (cons default-lab tn))
311 (inst lwz move-temp ocfp-tn (* i n-word-bytes))
312 (inst ble default-lab)
313 (inst addic. temp temp (- (fixnumize 1)))
314 (store-stack-tn tn move-temp)))
316 (emit-label defaulting-done)
317 (move csp-tn ocfp-tn)
319 (let ((defaults (defaults)))
321 (assemble (*elsewhere*)
322 (emit-label default-stack-vals)
323 (trace-table-entry trace-table-fun-prologue)
324 (do ((remaining defaults (cdr remaining)))
326 (let ((def (car remaining)))
327 (emit-label (car def))
328 (when (null (cdr remaining))
329 (inst b defaulting-done))
330 (store-stack-tn (cdr def) null-tn)))
331 (trace-table-entry trace-table-normal))))))
333 (inst compute-code-from-lra code-tn code-tn lra-label temp)))
337 ;;;; Unknown values receiving:
339 ;;; Emit code needed at the return point for an unknown-values call for an
340 ;;; arbitrary number of values.
342 ;;; We do the single and non-single cases with no shared code: there doesn't
343 ;;; seem to be any potential overlap, and receiving a single value is more
344 ;;; important efficiency-wise.
346 ;;; When there is a single value, we just push it on the stack, returning
347 ;;; the old SP and 1.
349 ;;; When there is a variable number of values, we move all of the argument
350 ;;; registers onto the stack, and return Args and Nargs.
352 ;;; Args and Nargs are TNs wired to the named locations. We must
353 ;;; explicitly allocate these TNs, since their lifetimes overlap with the
354 ;;; results Start and Count (also, it's nice to be able to target them).
356 (defun receive-unknown-values (args nargs start count lra-label temp)
357 (declare (type tn args nargs start count temp))
358 (let ((variable-values (gen-label))
360 (sb!assem:without-scheduling ()
361 (inst b variable-values)
364 (inst compute-code-from-lra code-tn code-tn lra-label temp)
365 (inst addi csp-tn csp-tn 4)
366 (storew (first *register-arg-tns*) csp-tn -1)
367 (inst subi start csp-tn 4)
368 (inst li count (fixnumize 1))
372 (assemble (*elsewhere*)
373 (trace-table-entry trace-table-fun-prologue)
374 (emit-label variable-values)
375 (inst compute-code-from-lra code-tn code-tn lra-label temp)
376 (do ((arg *register-arg-tns* (rest arg))
379 (storew (first arg) args i))
383 (trace-table-entry trace-table-normal)))
387 ;;; VOP that can be inherited by unknown values receivers. The main thing this
388 ;;; handles is allocation of the result temporaries.
390 (define-vop (unknown-values-receiver)
392 (start :scs (any-reg))
393 (count :scs (any-reg)))
394 (:temporary (:sc descriptor-reg :offset ocfp-offset
395 :from :eval :to (:result 0))
397 (:temporary (:sc any-reg :offset nargs-offset
398 :from :eval :to (:result 1))
400 (:temporary (:scs (non-descriptor-reg)) temp))
404 ;;;; Local call with unknown values convention return:
406 ;;; Non-TR local call for a fixed number of values passed according to the
407 ;;; unknown values convention.
409 ;;; Args are the argument passing locations, which are specified only to
410 ;;; terminate their lifetimes in the caller.
412 ;;; Values are the return value locations (wired to the standard passing
415 ;;; Save is the save info, which we can ignore since saving has been done.
416 ;;; Return-PC is the TN that the return PC should be passed in.
417 ;;; Target is a continuation pointing to the start of the called function.
418 ;;; Nvals is the number of values received.
420 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
421 ;;; registers may be tied up by the more operand. Instead, we use
422 ;;; MAYBE-LOAD-STACK-TN.
424 (define-vop (call-local)
428 (:results (values :more t))
430 (:move-args :local-call)
431 (:info arg-locs callee target nvals)
433 (:temporary (:scs (descriptor-reg) :from (:eval 0)) move-temp)
434 (:temporary (:scs (non-descriptor-reg)) temp)
435 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
436 (:temporary (:sc any-reg :offset ocfp-offset :from (:eval 0)) ocfp)
437 (:ignore arg-locs args ocfp)
439 (trace-table-entry trace-table-call-site)
440 (let ((label (gen-label))
441 (cur-nfp (current-nfp-tn vop)))
443 (store-stack-tn nfp-save cur-nfp))
444 (let ((callee-nfp (callee-nfp-tn callee)))
446 (maybe-load-stack-tn callee-nfp nfp)))
447 (maybe-load-stack-tn cfp-tn fp)
448 (inst compute-lra-from-code
449 (callee-return-pc-tn callee) code-tn label temp)
450 (note-this-location vop :call-site)
452 (emit-return-pc label)
453 (default-unknown-values vop values nvals move-temp temp label)
454 ;; alpha uses (maybe-load-stack-nfp-tn cur-nfp nfp-save temp)
455 ;; instead of the clause below
457 (load-stack-tn cur-nfp nfp-save)))
458 (trace-table-entry trace-table-normal)))
461 ;;; Non-TR local call for a variable number of return values passed according
462 ;;; to the unknown values convention. The results are the start of the values
463 ;;; glob and the number of values received.
465 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
466 ;;; registers may be tied up by the more operand. Instead, we use
467 ;;; MAYBE-LOAD-STACK-TN.
469 (define-vop (multiple-call-local unknown-values-receiver)
474 (:move-args :local-call)
475 (:info save callee target)
478 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
479 (:temporary (:scs (non-descriptor-reg)) temp)
481 (trace-table-entry trace-table-call-site)
482 (let ((label (gen-label))
483 (cur-nfp (current-nfp-tn vop)))
485 (store-stack-tn nfp-save cur-nfp))
486 (let ((callee-nfp (callee-nfp-tn callee)))
487 ;; alpha doesn't test this before the maybe-load
489 (maybe-load-stack-tn callee-nfp nfp)))
490 (maybe-load-stack-tn cfp-tn fp)
491 (inst compute-lra-from-code
492 (callee-return-pc-tn callee) code-tn label temp)
493 (note-this-location vop :call-site)
495 (emit-return-pc label)
496 (note-this-location vop :unknown-return)
497 (receive-unknown-values values-start nvals start count label temp)
499 (load-stack-tn cur-nfp nfp-save)))
500 (trace-table-entry trace-table-normal)))
503 ;;;; Local call with known values return:
505 ;;; Non-TR local call with known return locations. Known-value return works
506 ;;; 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.
512 (define-vop (known-call-local)
516 (:results (res :more t))
517 (:move-args :local-call)
519 (:info save callee target)
520 (:ignore args res save)
522 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
523 (:temporary (:scs (non-descriptor-reg)) temp)
525 (trace-table-entry trace-table-call-site)
526 (let ((label (gen-label))
527 (cur-nfp (current-nfp-tn vop)))
529 (store-stack-tn nfp-save cur-nfp))
530 (let ((callee-nfp (callee-nfp-tn callee)))
532 (maybe-load-stack-tn callee-nfp nfp)))
533 (maybe-load-stack-tn cfp-tn fp)
534 (inst compute-lra-from-code
535 (callee-return-pc-tn callee) code-tn label temp)
536 (note-this-location vop :call-site)
538 (emit-return-pc label)
539 (note-this-location vop :known-return)
541 (load-stack-tn cur-nfp nfp-save)))
542 (trace-table-entry trace-table-normal)))
544 ;;; Return from known values call. We receive the return locations as
545 ;;; arguments to terminate their lifetimes in the returning function. We
546 ;;; restore FP and CSP and jump to the Return-PC.
548 ;;; Note: we can't use normal load-tn allocation for the fixed args, since all
549 ;;; registers may be tied up by the more operand. Instead, we use
550 ;;; MAYBE-LOAD-STACK-TN.
552 (define-vop (known-return)
553 (:args (old-fp :target old-fp-temp)
554 (return-pc :target return-pc-temp)
556 (:temporary (:sc any-reg :from (:argument 0)) old-fp-temp)
557 (:temporary (:sc descriptor-reg :from (:argument 1)) return-pc-temp)
558 (:move-args :known-return)
560 (:ignore val-locs vals)
563 (trace-table-entry trace-table-fun-epilogue)
564 (maybe-load-stack-tn old-fp-temp old-fp)
565 (maybe-load-stack-tn return-pc-temp return-pc)
567 (let ((cur-nfp (current-nfp-tn vop)))
569 (inst addi nsp-tn cur-nfp
570 (- (bytes-needed-for-non-descriptor-stack-frame)
571 number-stack-displacement))))
572 (move cfp-tn old-fp-temp)
573 (inst j return-pc-temp (- n-word-bytes other-pointer-lowtag))
574 (trace-table-entry trace-table-normal)))
579 ;;; There is something of a cross-product effect with full calls. Different
580 ;;; versions are used depending on whether we know the number of arguments or
581 ;;; the name of the called function, and whether we want fixed values, unknown
582 ;;; values, or a tail call.
584 ;;; In full call, the arguments are passed creating a partial frame on the
585 ;;; stack top and storing stack arguments into that frame. On entry to the
586 ;;; callee, this partial frame is pointed to by FP. If there are no stack
587 ;;; arguments, we don't bother allocating a partial frame, and instead set FP
588 ;;; to SP just before the call.
590 ;;; This macro helps in the definition of full call VOPs by avoiding code
591 ;;; replication in defining the cross-product VOPs.
593 ;;; NAME is the name of the VOP to define.
595 ;;; NAMED is true if the first argument is a symbol whose global function
596 ;;; definition is to be called.
598 ;;; RETURN is either :FIXED, :UNKNOWN or :TAIL:
599 ;;; -- If :FIXED, then the call is for a fixed number of values, returned in
600 ;;; the standard passing locations (passed as result operands).
601 ;;; -- If :UNKNOWN, then the result values are pushed on the stack, and the
602 ;;; result values are specified by the Start and Count as in the
603 ;;; unknown-values continuation representation.
604 ;;; -- If :TAIL, then do a tail-recursive call. No values are returned.
605 ;;; The Old-Fp and Return-PC are passed as the second and third arguments.
607 ;;; In non-tail calls, the pointer to the stack arguments is passed as the last
608 ;;; fixed argument. If VARIABLE is false, then the passing locations are
609 ;;; passed as a more arg. VARIABLE is true if there are a variable number of
610 ;;; arguments passed on the stack. VARIABLE cannot be specified with :TAIL
611 ;;; return. TR variable argument call is implemented separately.
613 ;;; In tail call with fixed arguments, the passing locations are passed as a
614 ;;; more arg, but there is no new-FP, since the arguments have been set up in
615 ;;; the current frame.
616 (defmacro define-full-call (name named return variable)
617 (assert (not (and variable (eq return :tail))))
619 ,@(when (eq return :unknown)
620 '(unknown-values-receiver)))
622 ,@(unless (eq return :tail)
623 '((new-fp :scs (any-reg) :to :eval)))
626 '(name :target name-pass)
627 '(arg-fun :target lexenv))
629 ,@(when (eq return :tail)
630 '((old-fp :target old-fp-pass)
631 (return-pc :target return-pc-pass)))
633 ,@(unless variable '((args :more t :scs (descriptor-reg)))))
635 ,@(when (eq return :fixed)
636 '((:results (values :more t))))
638 (:save-p ,(if (eq return :tail) :compute-only t))
640 ,@(unless (or (eq return :tail) variable)
641 '((:move-args :full-call)))
644 (:info ,@(unless (or variable (eq return :tail)) '(arg-locs))
645 ,@(unless variable '(nargs))
646 ,@(when (eq return :fixed) '(nvals)))
649 ,@(unless (or variable (eq return :tail)) '(arg-locs))
650 ,@(unless variable '(args)))
652 (:temporary (:sc descriptor-reg
655 ,@(unless (eq return :fixed)
659 (:temporary (:sc descriptor-reg
661 :from (:argument ,(if (eq return :tail) 2 1))
666 `(:temporary (:sc descriptor-reg :offset fdefn-offset ; -dan
667 :from (:argument ,(if (eq return :tail) 0 1))
670 `(:temporary (:sc descriptor-reg :offset lexenv-offset
671 :from (:argument ,(if (eq return :tail) 0 1))
674 ;; alpha code suggests that function tn is not needed for named call
675 (:temporary (:scs (descriptor-reg) :from (:argument 0) :to :eval)
677 (:temporary (:sc any-reg :offset nargs-offset :to :eval)
681 (mapcar #'(lambda (name offset)
682 `(:temporary (:sc descriptor-reg
686 register-arg-names *register-arg-offsets*))
687 ,@(when (eq return :fixed)
688 '((:temporary (:scs (descriptor-reg) :from :eval) move-temp)))
690 ,@(unless (eq return :tail)
691 '((:temporary (:scs (non-descriptor-reg)) temp)
692 (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)))
694 (:temporary (:sc interior-reg :offset lip-offset) entry-point)
696 (:generator ,(+ (if named 5 0)
698 (if (eq return :tail) 0 10)
700 (if (eq return :unknown) 25 0))
701 (trace-table-entry trace-table-call-site)
702 (let* ((cur-nfp (current-nfp-tn vop))
703 ,@(unless (eq return :tail)
704 '((lra-label (gen-label))))
708 ,@(if (eq return :tail)
709 '((unless (location= old-fp old-fp-pass)
711 (unless (location= return-pc
721 (flet ((do-next-filler ()
722 (let* ((next (pop filler))
723 (what (if (consp next) (car next) next)))
727 `((inst sub nargs-pass csp-tn new-fp)
729 (mapcar #'(lambda (name)
732 register-arg-names)))
733 '((inst lr nargs-pass (fixnumize nargs)))))
734 ,@(if (eq return :tail)
738 (inst mr old-fp-pass old-fp))
740 (loadw old-fp-pass cfp-tn
741 (tn-offset old-fp)))))
745 (inst mr return-pc-pass return-pc))
747 (loadw return-pc-pass cfp-tn
748 (tn-offset return-pc)))))
750 (inst addi nsp-tn cur-nfp
751 (- (bytes-needed-for-non-descriptor-stack-frame)
752 number-stack-displacement))))
754 (inst compute-lra-from-code
755 return-pc-pass code-tn lra-label temp))
757 (store-stack-tn nfp-save cur-nfp))
759 (inst mr old-fp-pass cfp-tn))
762 '(move cfp-tn new-fp)
763 '(if (> nargs register-arg-count)
765 (move cfp-tn csp-tn))))))
769 (descriptor-reg (move name-pass name))
771 (loadw name-pass cfp-tn (tn-offset name))
774 (loadw name-pass code-tn (tn-offset name)
775 other-pointer-lowtag)
777 (loadw entry-point name-pass fdefn-raw-addr-slot
778 other-pointer-lowtag)
781 (descriptor-reg (move lexenv arg-fun))
783 (loadw lexenv cfp-tn (tn-offset arg-fun))
786 (loadw lexenv code-tn (tn-offset arg-fun)
787 sb!vm:other-pointer-lowtag)
789 (loadw function lexenv sb!vm:closure-fun-slot
790 sb!vm:fun-pointer-lowtag)
792 (inst addi entry-point function
793 (- (ash simple-fun-code-offset word-shift)
801 (note-this-location vop :call-site)
802 (inst mtctr entry-point)
803 ;; this following line is questionable. or else the alpha
804 ;; code (which doesn't do it) is questionable
805 ;; (inst mr code-tn function)
810 '((emit-return-pc lra-label)
811 (default-unknown-values vop values nvals move-temp
814 (load-stack-tn cur-nfp nfp-save))))
816 '((emit-return-pc lra-label)
817 (note-this-location vop :unknown-return)
818 (receive-unknown-values values-start nvals start count
821 (load-stack-tn cur-nfp nfp-save))))
823 (trace-table-entry trace-table-normal))))
826 (define-full-call call nil :fixed nil)
827 (define-full-call call-named t :fixed nil)
828 (define-full-call multiple-call nil :unknown nil)
829 (define-full-call multiple-call-named t :unknown nil)
830 (define-full-call tail-call nil :tail nil)
831 (define-full-call tail-call-named t :tail nil)
833 (define-full-call call-variable nil :fixed t)
834 (define-full-call multiple-call-variable nil :unknown t)
837 ;;; Defined separately, since needs special code that BLT's the arguments
840 (define-vop (tail-call-variable)
842 (args-arg :scs (any-reg) :target args)
843 (function-arg :scs (descriptor-reg) :target lexenv)
844 (old-fp-arg :scs (any-reg) :target old-fp)
845 (lra-arg :scs (descriptor-reg) :target lra))
847 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 0)) args)
848 (:temporary (:sc any-reg :offset lexenv-offset :from (:argument 1)) lexenv)
849 (:temporary (:sc any-reg :offset ocfp-offset :from (:argument 2)) old-fp)
850 (:temporary (:sc any-reg :offset lra-offset :from (:argument 3)) lra)
857 ;; Move these into the passing locations if they are not already there.
859 (move lexenv function-arg)
860 (move old-fp old-fp-arg)
864 ;; Clear the number stack if anything is there.
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))))
872 (inst ba (make-fixup 'tail-call-variable :assembly-routine))))
875 ;;;; Unknown values return:
878 ;;; Return a single value using the unknown-values convention.
880 (define-vop (return-single)
881 (:args (old-fp :scs (any-reg))
882 (return-pc :scs (descriptor-reg))
885 (:temporary (:scs (interior-reg)) lip)
888 (trace-table-entry trace-table-fun-epilogue)
889 ;; Clear the number stack.
890 (let ((cur-nfp (current-nfp-tn vop)))
892 (inst addi nsp-tn cur-nfp
893 (- (bytes-needed-for-non-descriptor-stack-frame)
894 number-stack-displacement))))
895 ;; Clear the control stack, and restore the frame pointer.
899 (lisp-return return-pc lip :offset 2)
900 (trace-table-entry trace-table-normal)))
902 ;;; Do unknown-values return of a fixed number of values. The Values are
903 ;;; required to be set up in the standard passing locations. Nvals is the
904 ;;; number of values returned.
906 ;;; If returning a single value, then deallocate the current frame, restore
907 ;;; FP and jump to the single-value entry at Return-PC + 8.
909 ;;; If returning other than one value, then load the number of values returned,
910 ;;; NIL out unsupplied values registers, restore FP and return at Return-PC.
911 ;;; When there are stack values, we must initialize the argument pointer to
912 ;;; point to the beginning of the values block (which is the beginning of the
917 (old-fp :scs (any-reg))
918 (return-pc :scs (descriptor-reg) :to (:eval 1))
922 (:temporary (:sc descriptor-reg :offset a0-offset :from (:eval 0)) a0)
923 (:temporary (:sc descriptor-reg :offset a1-offset :from (:eval 0)) a1)
924 (:temporary (:sc descriptor-reg :offset a2-offset :from (:eval 0)) a2)
925 (:temporary (:sc descriptor-reg :offset a3-offset :from (:eval 0)) a3)
926 (:temporary (:sc any-reg :offset nargs-offset) nargs)
927 (:temporary (:sc any-reg :offset ocfp-offset) val-ptr)
928 (:temporary (:scs (interior-reg)) lip)
931 (trace-table-entry trace-table-fun-epilogue)
932 ;; Clear the number stack.
933 (let ((cur-nfp (current-nfp-tn vop)))
935 (inst addi nsp-tn cur-nfp
936 (- (bytes-needed-for-non-descriptor-stack-frame)
937 number-stack-displacement))))
939 ;; Clear the control stack, and restore the frame pointer.
943 (lisp-return return-pc lip :offset 2))
945 ;; Establish the values pointer and values count.
946 (move val-ptr cfp-tn)
947 (inst lr nargs (fixnumize nvals))
948 ;; restore the frame pointer and clear as much of the control
949 ;; stack as possible.
951 (inst addi csp-tn val-ptr (* nvals n-word-bytes))
952 ;; pre-default any argument register that need it.
953 (when (< nvals register-arg-count)
954 (dolist (reg (subseq (list a0 a1 a2 a3) nvals))
957 (lisp-return return-pc lip)))
958 (trace-table-entry trace-table-normal)))
960 ;;; Do unknown-values return of an arbitrary number of values (passed on the
961 ;;; stack.) We check for the common case of a single return value, and do that
962 ;;; inline using the normal single value return convention. Otherwise, we
963 ;;; branch off to code that calls an assembly-routine.
965 (define-vop (return-multiple)
967 (old-fp-arg :scs (any-reg) :to (:eval 1))
968 (lra-arg :scs (descriptor-reg) :to (:eval 1))
969 (vals-arg :scs (any-reg) :target vals)
970 (nvals-arg :scs (any-reg) :target nvals))
972 (:temporary (:sc any-reg :offset nl1-offset :from (:argument 0)) old-fp)
973 (:temporary (:sc descriptor-reg :offset lra-offset :from (:argument 1)) lra)
974 (:temporary (:sc any-reg :offset nl0-offset :from (:argument 2)) vals)
975 (:temporary (:sc any-reg :offset nargs-offset :from (:argument 3)) nvals)
976 (:temporary (:sc descriptor-reg :offset a0-offset) a0)
977 (:temporary (:scs (interior-reg)) lip)
983 (trace-table-entry trace-table-fun-epilogue)
984 (let ((not-single (gen-label)))
985 ;; Clear the number stack.
986 (let ((cur-nfp (current-nfp-tn vop)))
988 (inst addi nsp-tn cur-nfp
989 (- (bytes-needed-for-non-descriptor-stack-frame)
990 number-stack-displacement))))
992 ;; Check for the single case.
993 (inst cmpwi nvals-arg (fixnumize 1))
994 (inst lwz a0 vals-arg 0)
995 (inst bne not-single)
997 ;; Return with one value.
999 (move cfp-tn old-fp-arg)
1000 (lisp-return lra-arg lip :offset 2)
1002 ;; Nope, not the single case.
1003 (emit-label not-single)
1004 (move old-fp old-fp-arg)
1006 (move vals vals-arg)
1007 (move nvals nvals-arg)
1008 (inst ba (make-fixup 'return-multiple :assembly-routine)))
1009 (trace-table-entry trace-table-normal)))
1016 ;;; We don't need to do anything special for regular functions.
1018 (define-vop (setup-environment)
1022 ;; Don't bother doing anything.
1025 ;;; Get the lexical environment from its passing location.
1027 (define-vop (setup-closure-environment)
1028 (:temporary (:sc descriptor-reg :offset lexenv-offset :target closure
1031 (:results (closure :scs (descriptor-reg)))
1036 (move closure lexenv)))
1038 ;;; Copy a more arg from the argument area to the end of the current frame.
1039 ;;; Fixed is the number of non-more arguments.
1041 (define-vop (copy-more-arg)
1042 (:temporary (:sc any-reg :offset nl0-offset) result)
1043 (:temporary (:sc any-reg :offset nl1-offset) count)
1044 (:temporary (:sc any-reg :offset nl2-offset) src)
1045 (:temporary (:sc any-reg :offset nl3-offset) dst)
1046 (:temporary (:sc descriptor-reg :offset l0-offset) temp)
1049 (let ((loop (gen-label))
1050 (do-regs (gen-label))
1052 (when (< fixed register-arg-count)
1053 ;; Save a pointer to the results so we can fill in register args.
1054 ;; We don't need this if there are more fixed args than reg args.
1055 (move result csp-tn))
1056 ;; Allocate the space on the stack.
1057 (cond ((zerop fixed)
1058 (inst cmpwi nargs-tn 0)
1059 (inst add csp-tn csp-tn nargs-tn)
1062 (inst addic. count nargs-tn (- (fixnumize fixed)))
1064 (inst add csp-tn csp-tn count)))
1065 (when (< fixed register-arg-count)
1066 ;; We must stop when we run out of stack args, not when we run out of
1068 (inst addic. count nargs-tn (- (fixnumize register-arg-count)))
1069 ;; Everything of interest is in registers.
1071 ;; Initialize dst to be end of stack.
1073 ;; Initialize src to be end of args.
1074 (inst add src cfp-tn nargs-tn)
1077 ;; *--dst = *--src, --count
1078 (inst addi src src (- sb!vm:n-word-bytes))
1079 (inst addic. count count (- (fixnumize 1)))
1081 (inst addi dst dst (- sb!vm:n-word-bytes))
1085 (emit-label do-regs)
1086 (when (< fixed register-arg-count)
1087 ;; Now we have to deposit any more args that showed up in registers.
1088 (inst subic. count nargs-tn (fixnumize fixed))
1089 (do ((i fixed (1+ i)))
1090 ((>= i register-arg-count))
1091 ;; Don't deposit any more than there are.
1093 (inst subic. count count (fixnumize 1))
1094 ;; Store it relative to the pointer saved at the start.
1095 (storew (nth i *register-arg-tns*) result (- i fixed))))
1096 (emit-label done))))
1099 ;;; More args are stored consecutively on the stack, starting immediately at
1100 ;;; the context pointer. The context pointer is not typed, so the lowtag is 0.
1102 (define-vop (more-arg word-index-ref)
1104 (:translate %more-arg))
1107 ;;; Turn more arg (context, count) into a list.
1109 (define-vop (listify-rest-args)
1110 (:args (context-arg :target context :scs (descriptor-reg))
1111 (count-arg :target count :scs (any-reg)))
1112 (:arg-types * tagged-num)
1113 (:temporary (:scs (any-reg) :from (:argument 0)) context)
1114 (:temporary (:scs (any-reg) :from (:argument 1)) count)
1115 (:temporary (:scs (descriptor-reg) :from :eval) temp)
1116 (:temporary (:scs (non-descriptor-reg) :from :eval) dst)
1117 (:temporary (:sc non-descriptor-reg :offset nl3-offset) pa-flag)
1118 (:results (result :scs (descriptor-reg)))
1119 (:translate %listify-rest-args)
1122 (move context context-arg)
1123 (move count count-arg)
1124 ;; Check to see if there are any arguments.
1125 (inst cmpwi count 0)
1126 (move result null-tn)
1129 ;; We need to do this atomically.
1130 (pseudo-atomic (pa-flag)
1132 ;; Allocate a cons (2 words) for each item.
1133 (inst clrrwi result alloc-tn n-lowtag-bits)
1134 (inst ori result result list-pointer-lowtag)
1136 (inst slwi temp count 1)
1137 (inst add alloc-tn alloc-tn temp)
1140 ;; Compute the next cons and store it in the current one.
1142 (inst addi dst dst (* 2 n-word-bytes))
1143 (storew dst dst -1 list-pointer-lowtag)
1147 (loadw temp context)
1148 (inst addi context context n-word-bytes)
1150 ;; Dec count, and if != zero, go back for more.
1151 (inst addic. count count (- (fixnumize 1)))
1152 ;; Store the value into the car of the current cons (in the delay
1154 (storew temp dst 0 list-pointer-lowtag)
1158 ;; NIL out the last cons.
1159 (storew null-tn dst 1 list-pointer-lowtag)))
1163 ;;; Return the location and size of the more arg glob created by Copy-More-Arg.
1164 ;;; Supplied is the total number of arguments supplied (originally passed in
1165 ;;; NARGS.) Fixed is the number of non-rest arguments.
1167 ;;; We must duplicate some of the work done by Copy-More-Arg, since at that
1168 ;;; time the environment is in a pretty brain-damaged state, preventing this
1169 ;;; info from being returned as values. What we do is compute
1170 ;;; supplied - fixed, and return a pointer that many words below the current
1173 (define-vop (more-arg-context)
1174 (:policy :fast-safe)
1175 (:translate sb!c::%more-arg-context)
1176 (:args (supplied :scs (any-reg)))
1177 (:arg-types tagged-num (:constant fixnum))
1179 (:results (context :scs (descriptor-reg))
1180 (count :scs (any-reg)))
1181 (:result-types t tagged-num)
1182 (:note "more-arg-context")
1184 (inst subi count supplied (fixnumize fixed))
1185 (inst sub context csp-tn count)))
1188 ;;; Signal wrong argument count error if Nargs isn't = to Count.
1191 (define-vop (verify-argument-count)
1192 (:policy :fast-safe)
1193 (:translate sb!c::%verify-argument-count)
1194 (:args (nargs :scs (any-reg)))
1195 (:arg-types positive-fixnum (:constant t))
1198 (:save-p :compute-only)
1201 (generate-error-code vop invalid-argument-count-error nargs)))
1202 (inst cmpwi nargs (fixnumize count))
1203 (inst bne err-lab))))
1205 (define-vop (verify-arg-count)
1206 (:policy :fast-safe)
1207 (:translate sb!c::%verify-arg-count)
1208 (:args (nargs :scs (any-reg)))
1209 (:arg-types positive-fixnum (:constant t))
1212 (:save-p :compute-only)
1214 (inst twi :ne nargs (fixnumize count))))
1217 ;;; Signal various errors.
1219 (macrolet ((frob (name error translate &rest args)
1220 `(define-vop (,name)
1222 `((:policy :fast-safe)
1223 (:translate ,translate)))
1224 (:args ,@(mapcar #'(lambda (arg)
1225 `(,arg :scs (any-reg descriptor-reg)))
1228 (:save-p :compute-only)
1230 (error-call vop ,error ,@args)))))
1231 (frob arg-count-error invalid-arg-count-error
1232 sb!c::%arg-count-error nargs)
1233 (frob type-check-error object-not-type-error sb!c::%type-check-error
1235 (frob layout-invalid-error layout-invalid-error sb!c::%layout-invalid-error
1237 (frob odd-key-args-error odd-key-args-error
1238 sb!c::%odd-key-args-error)
1239 (frob unknown-key-arg-error unknown-key-arg-error
1240 sb!c::%unknown-key-arg-error key)
1241 (frob nil-fun-returned-error nil-fun-returned-error nil fun))