1 ;;;; function call for the x86 VM
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 (defun standard-arg-location (n)
19 (declare (type unsigned-byte n
))
20 (if (< n register-arg-count
)
21 (make-wired-tn *backend-t-primitive-type
* descriptor-reg-sc-number
22 (nth n
*register-arg-offsets
*))
23 (make-wired-tn *backend-t-primitive-type
* control-stack-sc-number n
)))
25 (defun standard-arg-location-sc (n)
26 (declare (type unsigned-byte n
))
27 (if (< n register-arg-count
)
28 (make-sc-offset descriptor-reg-sc-number
29 (nth n
*register-arg-offsets
*))
30 (make-sc-offset control-stack-sc-number n
)))
32 (defconstant arg-count-sc
(make-sc-offset any-reg-sc-number rcx-offset
))
33 (defconstant closure-sc
(make-sc-offset any-reg-sc-number rax-offset
))
35 ;;; Make a passing location TN for a local call return PC.
37 ;;; Always wire the return PC location to the stack in its standard
39 (defun make-return-pc-passing-location (standard)
40 (declare (ignore standard
))
41 (make-wired-tn (primitive-type-or-lose 'system-area-pointer
)
42 sap-stack-sc-number return-pc-save-offset
))
44 (defconstant return-pc-passing-offset
45 (make-sc-offset sap-stack-sc-number return-pc-save-offset
))
47 ;;; This is similar to MAKE-RETURN-PC-PASSING-LOCATION, but makes a
48 ;;; location to pass OLD-FP in.
50 ;;; This is wired in both the standard and the local-call conventions,
51 ;;; because we want to be able to assume it's always there. Besides,
52 ;;; the x86 doesn't have enough registers to really make it profitable
53 ;;; to pass it in a register.
54 (defun make-old-fp-passing-location (standard)
55 (declare (ignore standard
))
56 (make-wired-tn *fixnum-primitive-type
* control-stack-sc-number
59 (defconstant old-fp-passing-offset
60 (make-sc-offset control-stack-sc-number ocfp-save-offset
))
62 ;;; Make the TNs used to hold OLD-FP and RETURN-PC within the current
63 ;;; function. We treat these specially so that the debugger can find
64 ;;; them at a known location.
66 ;;; Without using a save-tn - which does not make much sense if it is
67 ;;; wired to the stack?
68 (defun make-old-fp-save-location (physenv)
69 (physenv-debug-live-tn (make-wired-tn *fixnum-primitive-type
*
70 control-stack-sc-number
73 (defun make-return-pc-save-location (physenv)
74 (physenv-debug-live-tn
75 (make-wired-tn (primitive-type-or-lose 'system-area-pointer
)
76 sap-stack-sc-number return-pc-save-offset
)
79 ;;; Make a TN for the standard argument count passing location. We only
80 ;;; need to make the standard location, since a count is never passed when we
81 ;;; are using non-standard conventions.
82 (defun make-arg-count-location ()
83 (make-wired-tn *fixnum-primitive-type
* any-reg-sc-number rcx-offset
))
85 ;;; Make a TN to hold the number-stack frame pointer. This is allocated
86 ;;; once per component, and is component-live.
88 (make-restricted-tn *fixnum-primitive-type
* ignore-me-sc-number
))
90 (defun make-stack-pointer-tn ()
91 (make-normal-tn *fixnum-primitive-type
*))
93 (defun make-number-stack-pointer-tn ()
94 (make-restricted-tn *fixnum-primitive-type
* ignore-me-sc-number
))
96 ;;; Return a list of TNs that can be used to represent an unknown-values
97 ;;; continuation within a function.
98 (defun make-unknown-values-locations ()
99 (list (make-stack-pointer-tn)
100 (make-normal-tn *fixnum-primitive-type
*)))
102 ;;; This function is called by the ENTRY-ANALYZE phase, allowing
103 ;;; VM-dependent initialization of the IR2-COMPONENT structure. We
104 ;;; push placeholder entries in the CONSTANTS to leave room for
105 ;;; additional noise in the code object header.
106 (defun select-component-format (component)
107 (declare (type component component
))
108 (dotimes (i code-constants-offset
)
109 (vector-push-extend nil
110 (ir2-component-constants (component-info component
))))
115 ;;; This is used for setting up the Old-FP in local call.
116 (define-vop (current-fp)
117 (:results
(val :scs
(any-reg control-stack
)))
121 ;;; We don't have a separate NFP, so we don't need to do anything here.
122 (define-vop (compute-old-nfp)
128 ;;; Accessing a slot from an earlier stack frame is definite hackery.
129 (define-vop (ancestor-frame-ref)
130 (:args
(frame-pointer :scs
(descriptor-reg))
131 (variable-home-tn :load-if nil
))
132 (:results
(value :scs
(descriptor-reg any-reg
)))
135 (aver (sc-is variable-home-tn control-stack
))
136 (loadw value frame-pointer
137 (frame-word-offset (tn-offset variable-home-tn
)))))
138 (define-vop (ancestor-frame-set)
139 (:args
(frame-pointer :scs
(descriptor-reg))
140 (value :scs
(descriptor-reg any-reg
)))
141 (:results
(variable-home-tn :load-if nil
))
144 (aver (sc-is variable-home-tn control-stack
))
145 (storew value frame-pointer
146 (frame-word-offset (tn-offset variable-home-tn
)))))
148 (macrolet ((define-frame-op
149 (suffix sc stack-sc instruction
153 :disp
(frame-byte-offset
154 (tn-offset variable-home-tn
)))))
155 (let ((reffer (symbolicate 'ancestor-frame-ref
'/ suffix
))
156 (setter (symbolicate 'ancestor-frame-set
'/ suffix
)))
158 (define-vop (,reffer ancestor-frame-ref
)
159 (:results
(value :scs
(,sc
)))
161 (aver (sc-is variable-home-tn
,stack-sc
))
162 (inst ,instruction value
164 (define-vop (,setter ancestor-frame-set
)
165 (:args
(frame-pointer :scs
(descriptor-reg))
168 (aver (sc-is variable-home-tn
,stack-sc
))
169 (inst ,instruction
,ea value
)))))))
170 (define-frame-op double-float double-reg double-stack movsd
)
171 (define-frame-op single-float single-reg single-stack movss
)
172 (define-frame-op complex-double-float complex-double-reg complex-double-stack
173 movupd
(ea-for-cdf-data-stack variable-home-tn frame-pointer
))
174 (define-frame-op complex-single-float complex-single-reg complex-single-stack
175 movq
(ea-for-csf-data-stack variable-home-tn frame-pointer
))
176 (define-frame-op signed-byte-64 signed-reg signed-stack mov
)
177 (define-frame-op unsigned-byte-64 unsigned-reg unsigned-stack mov
)
178 (define-frame-op system-area-pointer sap-reg sap-stack mov
))
180 (defun primitive-type-indirect-cell-type (ptype)
181 (declare (type primitive-type ptype
))
182 (macrolet ((foo (&body data
)
183 `(case (primitive-type-name ptype
)
184 ,@(loop for
(name stack-sc ref set
) in data
188 (list (primitive-type-or-lose ',name
)
189 (sc-or-lose ',stack-sc
)
190 (lambda (node block fp value res
)
191 (sb!c
::vop
,ref node block
193 (lambda (node block fp new-val value
)
194 (sb!c
::vop
,set node block
195 fp new-val value
)))))))))
196 (foo (double-float double-stack
197 ancestor-frame-ref
/double-float
198 ancestor-frame-set
/double-float
)
199 (single-float single-stack
200 ancestor-frame-ref
/single-float
201 ancestor-frame-set
/single-float
)
202 (complex-double-float complex-double-stack
203 ancestor-frame-ref
/complex-double-float
204 ancestor-frame-set
/complex-double-float
)
205 (complex-single-float complex-single-stack
206 ancestor-frame-ref
/complex-single-float
207 ancestor-frame-set
/complex-single-float
)
208 (signed-byte-64 signed-stack
209 ancestor-frame-ref
/signed-byte-64
210 ancestor-frame-set
/signed-byte-64
)
211 (unsigned-byte-64 unsigned-stack
212 ancestor-frame-ref
/unsigned-byte-64
213 ancestor-frame-set
/unsigned-byte-64
)
214 (unsigned-byte-63 unsigned-stack
215 ancestor-frame-ref
/unsigned-byte-64
216 ancestor-frame-set
/unsigned-byte-64
)
217 (system-area-pointer sap-stack
218 ancestor-frame-ref
/system-area-pointer
219 ancestor-frame-set
/system-area-pointer
))))
221 (define-vop (xep-allocate-frame)
224 (emit-alignment n-lowtag-bits
)
225 (emit-label start-lab
)
226 ;; Skip space for the function header.
227 (inst simple-fun-header-word
)
228 (dotimes (i (* n-word-bytes
(1- simple-fun-code-offset
)))
231 ;; The start of the actual code.
232 ;; Save the return-pc.
233 (popw rbp-tn
(frame-word-offset return-pc-save-offset
))))
235 (define-vop (xep-setup-sp)
238 (make-ea :qword
:base rbp-tn
239 :disp
(- (* n-word-bytes
240 (- (max 3 (sb-allocated-size 'stack
))
243 ;;; This is emitted directly before either a known-call-local, call-local,
244 ;;; or a multiple-call-local. All it does is allocate stack space for the
245 ;;; callee (who has the same size stack as us).
246 (define-vop (allocate-frame)
247 (:results
(res :scs
(any-reg))
252 (inst lea res
(make-ea :qword
:base rsp-tn
253 :disp
(- (* sp-
>fp-offset n-word-bytes
))))
254 (inst sub rsp-tn
(* n-word-bytes
(sb-allocated-size 'stack
)))))
256 ;;; Allocate a partial frame for passing stack arguments in a full
257 ;;; call. NARGS is the number of arguments passed. We allocate at
258 ;;; least 3 slots, because the XEP noise is going to want to use them
259 ;;; before it can extend the stack.
260 (define-vop (allocate-full-call-frame)
262 (:results
(res :scs
(any-reg)))
264 (inst lea res
(make-ea :qword
:base rsp-tn
265 :disp
(- (* sp-
>fp-offset n-word-bytes
))))
266 (inst sub rsp-tn
(* (max nargs
3) n-word-bytes
))))
268 ;;; Emit code needed at the return-point from an unknown-values call
269 ;;; for a fixed number of values. Values is the head of the TN-REF
270 ;;; list for the locations that the values are to be received into.
271 ;;; Nvals is the number of values that are to be received (should
272 ;;; equal the length of Values).
274 ;;; If 0 or 1 values are expected, then we just emit an instruction to
275 ;;; reset the SP (which will only be executed when other than 1 value
278 ;;; In the general case we have to do three things:
279 ;;; -- Default unsupplied register values. This need only be done
280 ;;; when a single value is returned, since register values are
281 ;;; defaulted by the called in the non-single case.
282 ;;; -- Default unsupplied stack values. This needs to be done whenever
283 ;;; there are stack values.
284 ;;; -- Reset SP. This must be done whenever other than 1 value is
285 ;;; returned, regardless of the number of values desired.
286 (defun default-unknown-values (vop values nvals node
)
287 (declare (type (or tn-ref null
) values
)
288 (type unsigned-byte nvals
))
289 (let ((type (sb!c
::basic-combination-derived-type node
)))
292 (note-this-location vop
:single-value-return
)
294 ((<= (sb!kernel
:values-type-max-value-count type
)
296 (when (and (named-type-p type
)
297 (eq nil
(named-type-name type
)))
298 ;; The function never returns, it may happen that the code
299 ;; ends right here leavig the :SINGLE-VALUE-RETURN note
300 ;; dangling. Let's emit a NOP.
302 ((not (sb!kernel
:values-type-may-be-single-value-p type
))
303 (inst mov rsp-tn rbx-tn
))
305 (inst cmov
:c rsp-tn rbx-tn
))))
306 ((<= nvals register-arg-count
)
307 (note-this-location vop
:unknown-return
)
308 (when (sb!kernel
:values-type-may-be-single-value-p type
)
309 (let ((regs-defaulted (gen-label)))
310 (inst jmp
:c regs-defaulted
)
311 ;; Default the unsupplied registers.
312 (let* ((2nd-tn-ref (tn-ref-across values
))
313 (2nd-tn (tn-ref-tn 2nd-tn-ref
)))
314 (inst mov
2nd-tn nil-value
)
317 for tn-ref
= (tn-ref-across 2nd-tn-ref
)
318 then
(tn-ref-across tn-ref
)
319 for count from
2 below register-arg-count
320 do
(inst mov
(tn-ref-tn tn-ref
) 2nd-tn
))))
321 (inst mov rbx-tn rsp-tn
)
322 (emit-label regs-defaulted
)))
323 (when (< register-arg-count
324 (sb!kernel
:values-type-max-value-count type
))
325 (inst mov rsp-tn rbx-tn
)))
327 ;; The number of bytes depends on the relative jump instructions.
328 ;; Best case is 31+(n-3)*14, worst case is 35+(n-3)*18. For
329 ;; NVALS=6 that is 73/89 bytes, and for NVALS=7 that is 87/107
330 ;; bytes which is likely better than using the blt below.
331 (let ((regs-defaulted (gen-label))
332 (defaulting-done (gen-label))
333 (default-stack-slots (gen-label)))
334 (note-this-location vop
:unknown-return
)
335 ;; Branch off to the MV case.
336 (inst jmp
:c regs-defaulted
)
337 ;; Do the single value case.
338 ;; Default the register args
339 (inst mov rax-tn nil-value
)
341 (val (tn-ref-across values
) (tn-ref-across val
)))
342 ((= i
(min nvals register-arg-count
)))
343 (inst mov
(tn-ref-tn val
) rax-tn
))
344 ;; Fake other registers so it looks like we returned with all the
345 ;; registers filled in.
347 (inst jmp default-stack-slots
)
348 (emit-label regs-defaulted
)
349 (inst mov rax-tn nil-value
)
350 (collect ((defaults))
351 (do ((i register-arg-count
(1+ i
))
352 (val (do ((i 0 (1+ i
))
353 (val values
(tn-ref-across val
)))
354 ((= i register-arg-count
) val
))
355 (tn-ref-across val
)))
357 (let ((default-lab (gen-label))
359 (first-stack-arg-p (= i register-arg-count
)))
360 (defaults (cons default-lab
361 (cons tn first-stack-arg-p
)))
362 (inst cmp rcx-tn
(fixnumize i
))
363 (inst jmp
:be default-lab
)
364 (when first-stack-arg-p
365 ;; There are stack args so the frame of the callee is
366 ;; still there, save RDX in its first slot temporalily.
367 (storew rdx-tn rbx-tn
(frame-word-offset sp-
>fp-offset
)))
368 (loadw rdx-tn rbx-tn
(frame-word-offset (+ sp-
>fp-offset i
)))
369 (inst mov tn rdx-tn
)))
370 (emit-label defaulting-done
)
371 (loadw rdx-tn rbx-tn
(frame-word-offset sp-
>fp-offset
))
373 (let ((defaults (defaults)))
375 (assemble (*elsewhere
*)
376 (emit-label default-stack-slots
)
377 (dolist (default defaults
)
378 (emit-label (car default
))
380 ;; We are setting the first stack argument to NIL.
381 ;; The callee's stack frame is dead, save RDX by
382 ;; pushing it to the stack, it will end up at same
383 ;; place as in the (STOREW RDX-TN RBX-TN -1) case
386 (inst mov
(second default
) rax-tn
))
387 (inst jmp defaulting-done
)))))))
389 (let ((regs-defaulted (gen-label))
390 (restore-edi (gen-label))
391 (no-stack-args (gen-label))
392 (default-stack-vals (gen-label))
393 (count-okay (gen-label)))
394 (note-this-location vop
:unknown-return
)
395 ;; Branch off to the MV case.
396 (inst jmp
:c regs-defaulted
)
397 ;; Default the register args, and set up the stack as if we
398 ;; entered the MV return point.
399 (inst mov rbx-tn rsp-tn
)
400 (inst mov rdi-tn nil-value
)
401 (inst mov rsi-tn rdi-tn
)
402 ;; Compute a pointer to where to put the [defaulted] stack values.
403 (emit-label no-stack-args
)
407 (make-ea :qword
:base rbp-tn
408 :disp
(frame-byte-offset register-arg-count
)))
409 ;; Load RAX with NIL so we can quickly store it, and set up
410 ;; stuff for the loop.
411 (inst mov rax-tn nil-value
)
413 (inst mov rcx-tn
(- nvals register-arg-count
))
414 ;; Jump into the default loop.
415 (inst jmp default-stack-vals
)
416 ;; The regs are defaulted. We need to copy any stack arguments,
417 ;; and then default the remaining stack arguments.
418 (emit-label regs-defaulted
)
419 ;; Compute the number of stack arguments, and if it's zero or
420 ;; less, don't copy any stack arguments.
421 (inst sub rcx-tn
(fixnumize register-arg-count
))
422 (inst jmp
:le no-stack-args
)
424 (storew rdi-tn rbx-tn
(frame-word-offset (+ sp-
>fp-offset
1)))
425 ;; Throw away any unwanted args.
426 (inst cmp rcx-tn
(fixnumize (- nvals register-arg-count
)))
427 (inst jmp
:be count-okay
)
428 (inst mov rcx-tn
(fixnumize (- nvals register-arg-count
)))
429 (emit-label count-okay
)
430 ;; Save the number of stack values.
431 (inst mov rax-tn rcx-tn
)
432 ;; Compute a pointer to where the stack args go.
434 (make-ea :qword
:base rbp-tn
435 :disp
(frame-byte-offset register-arg-count
)))
436 ;; Save ESI, and compute a pointer to where the args come from.
437 (storew rsi-tn rbx-tn
(frame-word-offset (+ sp-
>fp-offset
2)))
439 (make-ea :qword
:base rbx-tn
440 :disp
(frame-byte-offset
441 (+ sp-
>fp-offset register-arg-count
))))
443 (inst shr rcx-tn n-fixnum-tag-bits
) ; make word count
448 (loadw rsi-tn rbx-tn
(frame-word-offset (+ sp-
>fp-offset
2)))
449 ;; Now we have to default the remaining args. Find out how many.
450 (inst sub rax-tn
(fixnumize (- nvals register-arg-count
)))
452 ;; If none, then just blow out of here.
453 (inst jmp
:le restore-edi
)
454 (inst mov rcx-tn rax-tn
)
455 (inst shr rcx-tn n-fixnum-tag-bits
) ; word count
456 ;; Load RAX with NIL for fast storing.
457 (inst mov rax-tn nil-value
)
459 (emit-label default-stack-vals
)
462 ;; Restore EDI, and reset the stack.
463 (emit-label restore-edi
)
464 (loadw rdi-tn rbx-tn
(frame-word-offset (+ sp-
>fp-offset
1)))
465 (inst mov rsp-tn rbx-tn
)
469 ;;;; unknown values receiving
471 ;;; Emit code needed at the return point for an unknown-values call
472 ;;; for an arbitrary number of values.
474 ;;; We do the single and non-single cases with no shared code: there
475 ;;; doesn't seem to be any potential overlap, and receiving a single
476 ;;; value is more important efficiency-wise.
478 ;;; When there is a single value, we just push it on the stack,
479 ;;; returning the old SP and 1.
481 ;;; When there is a variable number of values, we move all of the
482 ;;; argument registers onto the stack, and return ARGS and NARGS.
484 ;;; ARGS and NARGS are TNs wired to the named locations. We must
485 ;;; explicitly allocate these TNs, since their lifetimes overlap with
486 ;;; the results start and count. (Also, it's nice to be able to target
488 (defun receive-unknown-values (args nargs start count node
)
489 (declare (type tn args nargs start count
))
490 (let ((type (sb!c
::basic-combination-derived-type node
))
491 (variable-values (gen-label))
492 (stack-values (gen-label))
494 (when (sb!kernel
:values-type-may-be-single-value-p type
)
495 (inst jmp
:c variable-values
)
496 (cond ((location= start
(first *register-arg-tns
*))
497 (inst push
(first *register-arg-tns
*))
498 (inst lea start
(make-ea :qword
:base rsp-tn
:disp n-word-bytes
)))
499 (t (inst mov start rsp-tn
)
500 (inst push
(first *register-arg-tns
*))))
501 (inst mov count
(fixnumize 1))
503 (emit-label variable-values
))
504 ;; The stack frame is burnt and RETurned from if there are no
505 ;; stack values. In this case quickly reallocate sufficient space.
506 (when (<= (sb!kernel
:values-type-min-value-count type
)
508 (inst cmp nargs
(fixnumize register-arg-count
))
509 (inst jmp
:g stack-values
)
510 #!+#.
(cl:if
(cl:= sb
!vm
:word-shift sb
!vm
:n-fixnum-tag-bits
) '(and) '(or))
511 (inst sub rsp-tn nargs
)
512 #!-
#.
(cl:if
(cl:= sb
!vm
:word-shift sb
!vm
:n-fixnum-tag-bits
) '(and) '(or))
514 ;; FIXME: This can't be efficient, but LEA (my first choice)
515 ;; doesn't do subtraction.
516 (inst shl nargs
(- word-shift n-fixnum-tag-bits
))
517 (inst sub rsp-tn nargs
)
518 (inst shr nargs
(- word-shift n-fixnum-tag-bits
)))
519 (emit-label stack-values
))
520 ;; dtc: this writes the registers onto the stack even if they are
521 ;; not needed, only the number specified in rcx are used and have
522 ;; stack allocated to them. No harm is done.
524 for arg in
*register-arg-tns
*
526 for j below
(sb!kernel
:values-type-max-value-count type
)
527 do
(storew arg args i
))
534 ;;; VOP that can be inherited by unknown values receivers. The main thing this
535 ;;; handles is allocation of the result temporaries.
536 (define-vop (unknown-values-receiver)
537 (:temporary
(:sc descriptor-reg
:offset rbx-offset
538 :from
:eval
:to
(:result
0))
540 (:temporary
(:sc any-reg
:offset rcx-offset
541 :from
:eval
:to
(:result
1))
543 (:results
(start :scs
(any-reg control-stack
))
544 (count :scs
(any-reg control-stack
))))
546 ;;;; local call with unknown values convention return
548 (defun check-ocfp-and-return-pc (old-fp return-pc
)
550 (format t
"*known-return: old-fp ~S, tn-kind ~S; ~S ~S~%"
551 old-fp
(sb!c
::tn-kind old-fp
) (sb!c
::tn-save-tn old-fp
)
552 (sb!c
::tn-kind
(sb!c
::tn-save-tn old-fp
)))
554 (format t
"*known-return: return-pc ~S, tn-kind ~S; ~S ~S~%"
555 return-pc
(sb!c
::tn-kind return-pc
)
556 (sb!c
::tn-save-tn return-pc
)
557 (sb!c
::tn-kind
(sb!c
::tn-save-tn return-pc
)))
558 (unless (and (sc-is old-fp control-stack
)
559 (= (tn-offset old-fp
) ocfp-save-offset
))
560 (error "ocfp not on stack in standard save location?"))
561 (unless (and (sc-is return-pc sap-stack
)
562 (= (tn-offset return-pc
) return-pc-save-offset
))
563 (error "return-pc not on stack in standard save location?")))
565 ;;; The local call convention doesn't fit that well with x86-style
566 ;;; calls. Emit a header for local calls to pop the return address
567 ;;; in the right place.
568 (defun emit-block-header (start-label trampoline-label fall-thru-p alignp
)
569 (when (and fall-thru-p trampoline-label
)
570 (inst jmp start-label
))
571 (when trampoline-label
572 (emit-label trampoline-label
)
573 (popw rbp-tn
(frame-word-offset return-pc-save-offset
)))
575 (emit-alignment n-lowtag-bits
:long-nop
))
576 (emit-label start-label
))
578 ;;; Non-TR local call for a fixed number of values passed according to
579 ;;; the unknown values convention.
581 ;;; FP is the frame pointer in install before doing the call.
583 ;;; NFP would be the number-stack frame pointer if we had a separate
586 ;;; Args are the argument passing locations, which are specified only
587 ;;; to terminate their lifetimes in the caller.
589 ;;; VALUES are the return value locations (wired to the standard
590 ;;; passing locations). NVALS is the number of values received.
592 ;;; Save is the save info, which we can ignore since saving has been
595 ;;; TARGET is a continuation pointing to the start of the called
597 (define-vop (call-local)
601 (:results
(values :more t
))
603 (:move-args
:local-call
)
604 (:info arg-locs callee target nvals
)
606 (:ignore nfp arg-locs args callee
)
610 (note-this-location vop
:call-site
)
612 (default-unknown-values vop values nvals node
)))
614 ;;; Non-TR local call for a variable number of return values passed according
615 ;;; to the unknown values convention. The results are the start of the values
616 ;;; glob and the number of values received.
617 (define-vop (multiple-call-local unknown-values-receiver
)
622 (:move-args
:local-call
)
623 (:info save callee target
)
624 (:ignore args save nfp callee
)
629 (note-this-location vop
:call-site
)
631 (note-this-location vop
:unknown-return
)
632 (receive-unknown-values values-start nvals start count node
)))
634 ;;;; local call with known values return
636 ;;; Non-TR local call with known return locations. Known-value return
637 ;;; works just like argument passing in local call.
639 ;;; Note: we can't use normal load-tn allocation for the fixed args,
640 ;;; since all registers may be tied up by the more operand. Instead,
641 ;;; we use MAYBE-LOAD-STACK-TN.
642 (define-vop (known-call-local)
646 (:results
(res :more t
))
647 (:move-args
:local-call
)
649 (:info save callee target
)
650 (:ignore args res save nfp callee
)
654 (note-this-location vop
:call-site
)
656 (note-this-location vop
:known-return
)))
658 ;;; From Douglas Crosher
659 ;;; Return from known values call. We receive the return locations as
660 ;;; arguments to terminate their lifetimes in the returning function. We
661 ;;; restore FP and CSP and jump to the Return-PC.
662 (define-vop (known-return)
666 (:move-args
:known-return
)
668 (:ignore val-locs vals
)
671 (check-ocfp-and-return-pc old-fp return-pc
)
672 ;; Zot all of the stack except for the old-fp and return-pc.
673 (inst mov rsp-tn rbp-tn
)
679 ;;; There is something of a cross-product effect with full calls.
680 ;;; Different versions are used depending on whether we know the
681 ;;; number of arguments or the name of the called function, and
682 ;;; whether we want fixed values, unknown values, or a tail call.
684 ;;; In full call, the arguments are passed creating a partial frame on
685 ;;; the stack top and storing stack arguments into that frame. On
686 ;;; entry to the callee, this partial frame is pointed to by FP.
688 ;;; This macro helps in the definition of full call VOPs by avoiding
689 ;;; code replication in defining the cross-product VOPs.
691 ;;; NAME is the name of the VOP to define.
693 ;;; NAMED is true if the first argument is an fdefinition object whose
694 ;;; definition is to be called.
696 ;;; RETURN is either :FIXED, :UNKNOWN or :TAIL:
697 ;;; -- If :FIXED, then the call is for a fixed number of values, returned in
698 ;;; the standard passing locations (passed as result operands).
699 ;;; -- If :UNKNOWN, then the result values are pushed on the stack, and the
700 ;;; result values are specified by the Start and Count as in the
701 ;;; unknown-values continuation representation.
702 ;;; -- If :TAIL, then do a tail-recursive call. No values are returned.
703 ;;; The Old-Fp and Return-PC are passed as the second and third arguments.
705 ;;; In non-tail calls, the pointer to the stack arguments is passed as
706 ;;; the last fixed argument. If Variable is false, then the passing
707 ;;; locations are passed as a more arg. Variable is true if there are
708 ;;; a variable number of arguments passed on the stack. Variable
709 ;;; cannot be specified with :TAIL return. TR variable argument call
710 ;;; is implemented separately.
712 ;;; In tail call with fixed arguments, the passing locations are
713 ;;; passed as a more arg, but there is no new-FP, since the arguments
714 ;;; have been set up in the current frame.
715 (macrolet ((define-full-call (name named return variable
)
716 (aver (not (and variable
(eq return
:tail
))))
718 ,@(when (eq return
:unknown
)
719 '(unknown-values-receiver)))
721 ,@(unless (eq return
:tail
)
722 '((new-fp :scs
(any-reg) :to
(:argument
1))))
724 (fun :scs
(descriptor-reg control-stack
)
725 :target rax
:to
(:argument
0))
727 ,@(when (eq return
:tail
)
731 ,@(unless variable
'((args :more t
:scs
(descriptor-reg)))))
733 ,@(when (eq return
:fixed
)
734 '((:results
(values :more t
))))
736 (:save-p
,(if (eq return
:tail
) :compute-only t
))
738 ,@(unless (or (eq return
:tail
) variable
)
739 '((:move-args
:full-call
)))
743 ,@(unless (or variable
(eq return
:tail
)) '(arg-locs))
744 ,@(unless variable
'(nargs))
745 ,@(when (eq return
:fixed
) '(nvals))
749 ,@(unless (or variable
(eq return
:tail
)) '(arg-locs))
750 ,@(unless variable
'(args)))
752 ;; We pass either the fdefn object (for named call) or
753 ;; the actual function object (for unnamed call) in
754 ;; RAX. With named call, closure-tramp will replace it
755 ;; with the real function and invoke the real function
756 ;; for closures. Non-closures do not need this value,
757 ;; so don't care what shows up in it.
765 ;; We pass the number of arguments in RCX.
766 (:temporary
(:sc unsigned-reg
:offset rcx-offset
:to
:eval
) rcx
)
768 ;; With variable call, we have to load the
769 ;; register-args out of the (new) stack frame before
770 ;; doing the call. Therefore, we have to tell the
771 ;; lifetime stuff that we need to use them.
773 (mapcar (lambda (name offset
)
774 `(:temporary
(:sc descriptor-reg
779 *register-arg-names
* *register-arg-offsets
*))
781 ,@(when (eq return
:tail
)
782 '((:temporary
(:sc unsigned-reg
786 ,@(unless (eq return
:tail
)
789 (:generator
,(+ (if named
5 0)
791 (if (eq return
:tail
) 0 10)
793 (if (eq return
:unknown
) 25 0))
794 ;; This has to be done before the frame pointer is
795 ;; changed! RAX stores the 'lexical environment' needed
801 ;; For variable call, compute the number of
802 ;; arguments and move some of the arguments to
805 ;; Compute the number of arguments.
806 (noise '(inst mov rcx new-fp
))
807 (noise '(inst sub rcx rsp-tn
))
808 #.
(unless (= word-shift n-fixnum-tag-bits
)
809 '(noise '(inst shr rcx
810 (- word-shift n-fixnum-tag-bits
))))
811 ;; Move the necessary args to registers,
812 ;; this moves them all even if they are
815 for name in
*register-arg-names
*
816 for index downfrom -
1
817 do
(noise `(loadw ,name new-fp
,index
)))
821 (inst mov rcx
(fixnumize nargs
)))))
822 ,@(cond ((eq return
:tail
)
823 '(;; Python has figured out what frame we should
824 ;; return to so might as well use that clue.
825 ;; This seems really important to the
826 ;; implementation of things like
827 ;; (without-interrupts ...)
829 ;; dtc; Could be doing a tail call from a
830 ;; known-local-call etc in which the old-fp
831 ;; or ret-pc are in regs or in non-standard
832 ;; places. If the passing location were
833 ;; wired to the stack in standard locations
834 ;; then these moves will be un-necessary;
835 ;; this is probably best for the x86.
838 (unless (= ocfp-save-offset
840 ;; FIXME: FORMAT T for stale
841 ;; diagnostic output (several of
842 ;; them around here), ick
843 (error "** tail-call old-fp not S0~%")
844 (move old-fp-tmp old-fp
)
847 (frame-word-offset ocfp-save-offset
))))
848 ((any-reg descriptor-reg
)
849 (error "** tail-call old-fp in reg not S0~%")
852 (frame-word-offset ocfp-save-offset
))))
854 ;; For tail call, we have to push the
855 ;; return-pc so that it looks like we CALLed
856 ;; despite the fact that we are going to JMP.
857 (inst push return-pc
)
860 ;; For non-tail call, we have to save our
861 ;; frame pointer and install the new frame
862 ;; pointer. We can't load stack tns after this
864 `(;; Python doesn't seem to allocate a frame
865 ;; here which doesn't leave room for the
868 ;; The variable args are on the stack and
869 ;; become the frame, but there may be <3
870 ;; args and 3 stack slots are assumed
871 ;; allocate on the call. So need to ensure
872 ;; there are at least 3 slots. This hack
875 '(inst sub rsp-tn
(* 3 n-word-bytes
)))
877 ;; Bias the new-fp for use as an fp
879 '(inst sub new-fp
(* sp-
>fp-offset n-word-bytes
)))
882 (storew rbp-tn new-fp
883 (frame-word-offset ocfp-save-offset
))
885 (move rbp-tn new-fp
) ; NB - now on new stack frame.
888 (when step-instrumenting
889 (emit-single-step-test)
891 (inst break single-step-around-trap
))
894 (note-this-location vop
:call-site
)
896 (inst ,(if (eq return
:tail
) 'jmp
'call
)
897 (make-ea :qword
:base rax
899 '(- (* fdefn-raw-addr-slot
901 other-pointer-lowtag
)
902 '(- (* closure-fun-slot n-word-bytes
)
903 fun-pointer-lowtag
))))
906 '((default-unknown-values vop values nvals node
)))
908 '((note-this-location vop
:unknown-return
)
909 (receive-unknown-values values-start nvals start count
913 (define-full-call call nil
:fixed nil
)
914 (define-full-call call-named t
:fixed nil
)
915 (define-full-call multiple-call nil
:unknown nil
)
916 (define-full-call multiple-call-named t
:unknown nil
)
917 (define-full-call tail-call nil
:tail nil
)
918 (define-full-call tail-call-named t
:tail nil
)
920 (define-full-call call-variable nil
:fixed t
)
921 (define-full-call multiple-call-variable nil
:unknown t
))
923 ;;; This is defined separately, since it needs special code that BLT's
924 ;;; the arguments down. All the real work is done in the assembly
925 ;;; routine. We just set things up so that it can find what it needs.
926 (define-vop (tail-call-variable)
927 (:args
(args :scs
(any-reg control-stack
) :target rsi
)
928 (function :scs
(descriptor-reg control-stack
) :target rax
)
931 (:temporary
(:sc unsigned-reg
:offset rsi-offset
:from
(:argument
0)) rsi
)
932 (:temporary
(:sc unsigned-reg
:offset rax-offset
:from
(:argument
1)) rax
)
933 (:temporary
(:sc unsigned-reg
) call-target
)
935 (check-ocfp-and-return-pc old-fp return-pc
)
936 ;; Move these into the passing locations if they are not already there.
939 ;; And jump to the assembly routine.
940 (inst mov call-target
(make-fixup 'tail-call-variable
:assembly-routine
))
941 (inst jmp call-target
)))
943 ;;;; unknown values return
945 ;;; Return a single-value using the Unknown-Values convention.
947 ;;; pfw--get wired-tn conflicts sometimes if register sc specd for args
948 ;;; having problems targeting args to regs -- using temps instead.
950 ;;; First off, modifying the return-pc defeats the branch-prediction
951 ;;; optimizations on modern CPUs quite handily. Second, we can do all
952 ;;; this without needing a temp register. Fixed the latter, at least.
953 ;;; -- AB 2006/Feb/04
954 (define-vop (return-single)
960 (check-ocfp-and-return-pc old-fp return-pc
)
961 ;; Drop stack above old-fp
962 (inst mov rsp-tn rbp-tn
)
963 ;; Clear the multiple-value return flag
965 ;; Restore the old frame pointer
970 ;;; Do unknown-values return of a fixed (other than 1) number of
971 ;;; values. The VALUES are required to be set up in the standard
972 ;;; passing locations. NVALS is the number of values returned.
974 ;;; Basically, we just load RCX with the number of values returned and
975 ;;; RBX with a pointer to the values, set RSP to point to the end of
976 ;;; the values, and jump directly to return-pc.
979 (return-pc :to
(:eval
1))
983 ;; In the case of other than one value, we need these registers to
984 ;; tell the caller where they are and how many there are.
985 (:temporary
(:sc unsigned-reg
:offset rbx-offset
) rbx
)
986 (:temporary
(:sc unsigned-reg
:offset rcx-offset
) rcx
)
987 ;; We need to stretch the lifetime of return-pc past the argument
988 ;; registers so that we can default the argument registers without
989 ;; trashing return-pc.
990 (:temporary
(:sc unsigned-reg
:offset
(first *register-arg-offsets
*)
992 (:temporary
(:sc unsigned-reg
:offset
(second *register-arg-offsets
*)
994 (:temporary
(:sc unsigned-reg
:offset
(third *register-arg-offsets
*)
998 (check-ocfp-and-return-pc old-fp return-pc
)
1000 ;; This is handled in RETURN-SINGLE.
1001 (error "nvalues is 1"))
1002 ;; Establish the values pointer and values count.
1003 (inst lea rbx
(make-ea :qword
:base rbp-tn
1004 :disp
(* sp-
>fp-offset n-word-bytes
)))
1006 (zeroize rcx
) ; smaller
1007 (inst mov rcx
(fixnumize nvals
)))
1008 ;; Pre-default any argument register that need it.
1009 (when (< nvals register-arg-count
)
1010 (let* ((arg-tns (nthcdr nvals
(list a0 a1 a2
)))
1011 (first (first arg-tns
)))
1012 (inst mov first nil-value
)
1013 (dolist (tn (cdr arg-tns
))
1014 (inst mov tn first
))))
1015 ;; Set the multiple value return flag.
1017 ;; And away we go. Except that return-pc is still on the
1018 ;; stack and we've changed the stack pointer. So we have to
1019 ;; tell it to index off of RBX instead of RBP.
1020 (cond ((<= nvals register-arg-count
)
1021 (inst mov rsp-tn rbp-tn
)
1025 ;; Some values are on the stack after RETURN-PC and OLD-FP,
1026 ;; can't return normally and some slots of the frame will
1027 ;; be used as temporaries by the receiver.
1029 ;; Clear as much of the stack as possible, but not past the
1030 ;; old frame address.
1032 (make-ea :qword
:base rbp-tn
1033 :disp
(frame-byte-offset (1- nvals
))))
1034 (move rbp-tn old-fp
)
1035 (inst push
(make-ea :qword
:base rbx
1036 :disp
(frame-byte-offset
1038 (tn-offset return-pc
)))))
1041 ;;; Do unknown-values return of an arbitrary number of values (passed
1042 ;;; on the stack.) We check for the common case of a single return
1043 ;;; value, and do that inline using the normal single value return
1044 ;;; convention. Otherwise, we branch off to code that calls an
1045 ;;; assembly-routine.
1047 ;;; The assembly routine takes the following args:
1048 ;;; RCX -- number of values to find there.
1049 ;;; RSI -- pointer to where to find the values.
1050 (define-vop (return-multiple)
1053 (vals :scs
(any-reg) :target rsi
)
1054 (nvals :scs
(any-reg) :target rcx
))
1055 (:temporary
(:sc unsigned-reg
:offset rsi-offset
:from
(:argument
2)) rsi
)
1056 (:temporary
(:sc unsigned-reg
:offset rcx-offset
:from
(:argument
3)) rcx
)
1057 (:temporary
(:sc unsigned-reg
) return-asm
)
1058 (:temporary
(:sc descriptor-reg
:offset
(first *register-arg-offsets
*)
1059 :from
(:eval
0)) a0
)
1062 (check-ocfp-and-return-pc old-fp return-pc
)
1063 (unless (policy node
(> space speed
))
1064 ;; Check for the single case.
1065 (let ((not-single (gen-label)))
1066 (inst cmp nvals
(fixnumize 1))
1067 (inst jmp
:ne not-single
)
1068 ;; Return with one value.
1070 ;; Clear the stack until ocfp.
1071 (inst mov rsp-tn rbp-tn
)
1072 ;; clear the multiple-value return flag
1077 ;; Nope, not the single case. Jump to the assembly routine.
1078 (emit-label not-single
)))
1081 (inst mov return-asm
(make-fixup 'return-multiple
:assembly-routine
))
1082 (inst jmp return-asm
)))
1086 ;;; Get the lexical environment from its passing location.
1087 (define-vop (setup-closure-environment)
1088 (:results
(closure :scs
(descriptor-reg)))
1093 (move closure rax-tn
)))
1095 ;;; Copy a &MORE arg from the argument area to the end of the current
1096 ;;; frame. FIXED is the number of non-&MORE arguments.
1097 (define-vop (copy-more-arg)
1098 (:temporary
(:sc any-reg
:offset r8-offset
) copy-index
)
1099 (:temporary
(:sc any-reg
:offset r9-offset
) source
)
1100 (:temporary
(:sc descriptor-reg
:offset r10-offset
) temp
)
1103 ;; Avoid the copy if there are no more args.
1104 (cond ((zerop fixed
)
1105 (inst jrcxz JUST-ALLOC-FRAME
))
1107 (inst cmp rcx-tn
(fixnumize fixed
))
1108 (inst jmp
:be JUST-ALLOC-FRAME
)))
1110 ;; Create a negated copy of the number of arguments to allow us to
1111 ;; use EA calculations in order to do scaled subtraction.
1112 (inst mov temp rcx-tn
)
1115 ;; Allocate the space on the stack.
1116 ;; stack = rbp + sp->fp-offset - (max 3 frame-size) - (nargs - fixed)
1117 ;; if we'd move SP backward, swap the meaning of rsp and source;
1118 ;; otherwise, we'd be accessing values below SP, and that's no good
1119 ;; if a signal interrupts this code sequence. In that case, store
1120 ;; the final value in rsp after the stack-stack memmove loop.
1121 (inst lea
(if (<= fixed
(max 3 (sb-allocated-size 'stack
)))
1124 (make-ea :qword
:base rbp-tn
1125 :index temp
:scale
(ash 1 (- word-shift n-fixnum-tag-bits
))
1126 :disp
(* n-word-bytes
1127 (- (+ sp-
>fp-offset fixed
)
1128 (max 3 (sb-allocated-size 'stack
))))))
1130 ;; Now: nargs>=1 && nargs>fixed
1132 ;; Save the original count of args.
1133 (inst mov rbx-tn rcx-tn
)
1135 (cond ((< fixed register-arg-count
)
1136 ;; the code above only moves the final value of rsp in
1137 ;; rsp directly if that condition is satisfied. Currently,
1138 ;; r-a-c is 3, so the aver is OK. If the calling convention
1139 ;; ever changes, the logic above with LEA will have to be
1141 (aver (<= fixed
(max 3 (sb-allocated-size 'stack
))))
1142 ;; We must stop when we run out of stack args, not when we
1143 ;; run out of more args.
1144 ;; Number to copy = nargs-3
1145 (inst sub rbx-tn
(fixnumize register-arg-count
))
1146 ;; Everything of interest in registers.
1147 (inst jmp
:be DO-REGS
))
1149 ;; Number to copy = nargs-fixed
1150 (inst sub rbx-tn
(fixnumize fixed
))))
1152 ;; Initialize R8 to be the end of args.
1153 ;; Swap with SP if necessary to mirror the previous condition
1154 (inst lea
(if (<= fixed
(max 3 (sb-allocated-size 'stack
)))
1157 (make-ea :qword
:base rbp-tn
1158 :index temp
:scale
(ash 1 (- word-shift n-fixnum-tag-bits
))
1159 :disp
(* sp-
>fp-offset n-word-bytes
)))
1161 ;; src: rbp + temp + sp->fp
1162 ;; dst: rbp + temp + sp->fp + (fixed - (max 3 [stack-size]))
1163 (let ((delta (- fixed
(max 3 (sb-allocated-size 'stack
))))
1165 (fixnum->word
(ash 1 (- word-shift n-fixnum-tag-bits
))))
1166 (cond ((zerop delta
)) ; no-op move
1168 ;; dst is lower than src, copy forward
1169 (zeroize copy-index
)
1170 ;; We used to use REP MOVS here, but on modern x86 it performs
1171 ;; much worse than an explicit loop for small blocks.
1174 (inst mov temp
(make-ea :qword
:base source
:index copy-index
))
1175 (inst mov
(make-ea :qword
:base rsp-tn
:index copy-index
) temp
)
1176 (inst add copy-index n-word-bytes
)
1177 (inst sub rbx-tn
(fixnumize 1))
1178 (inst jmp
:nz loop
))
1180 ;; dst is higher than src; copy backward
1182 (inst sub rbx-tn
(fixnumize 1))
1183 (inst mov temp
(make-ea :qword
:base rsp-tn
1184 :index rbx-tn
:scale fixnum-
>word
))
1185 (inst mov
(make-ea :qword
:base source
1186 :index rbx-tn
:scale fixnum-
>word
)
1189 ;; done with the stack--stack copy. Reset RSP to its final
1191 (inst mov rsp-tn source
))))
1194 ;; Here: nargs>=1 && nargs>fixed
1195 (when (< fixed register-arg-count
)
1196 ;; Now we have to deposit any more args that showed up in
1200 ;; Store it relative to rbp
1201 (inst mov
(make-ea :qword
:base rbp-tn
1202 :disp
(* n-word-bytes
1206 (max 3 (sb-allocated-size
1208 (nth i
*register-arg-tns
*))
1211 (when (>= i register-arg-count
)
1214 ;; Don't deposit any more than there are.
1216 (inst test rcx-tn rcx-tn
)
1217 (inst cmp rcx-tn
(fixnumize i
)))
1218 (inst jmp
:eq DONE
)))
1224 (make-ea :qword
:base rbp-tn
1225 :disp
(* n-word-bytes
1227 (max 3 (sb-allocated-size 'stack
))))))
1231 (define-vop (more-kw-arg)
1232 (:translate sb
!c
::%more-kw-arg
)
1233 (:policy
:fast-safe
)
1234 (:args
(object :scs
(descriptor-reg) :to
(:result
1))
1235 (index :scs
(any-reg) :to
(:result
1) :target keyword
))
1236 (:arg-types
* tagged-num
)
1237 (:results
(value :scs
(descriptor-reg any-reg
))
1238 (keyword :scs
(descriptor-reg any-reg
)))
1241 (inst mov value
(make-ea :qword
:base object
:index index
1242 :scale
(ash 1 (- word-shift n-fixnum-tag-bits
))))
1243 (inst mov keyword
(make-ea :qword
:base object
:index index
1244 :scale
(ash 1 (- word-shift n-fixnum-tag-bits
))
1245 :disp n-word-bytes
))))
1247 (define-vop (more-arg/c
)
1248 (:translate sb
!c
::%more-arg
)
1249 (:policy
:fast-safe
)
1250 (:args
(object :scs
(descriptor-reg) :to
(:result
1)))
1252 (:arg-types
* (:constant
(signed-byte 32)))
1253 (:results
(value :scs
(descriptor-reg any-reg
)))
1256 (inst mov value
(make-ea :qword
:base object
1257 :disp
(- (* index n-word-bytes
))))))
1259 (define-vop (more-arg)
1260 (:translate sb
!c
::%more-arg
)
1261 (:policy
:fast-safe
)
1262 (:args
(object :scs
(descriptor-reg) :to
(:result
1))
1263 (index :scs
(any-reg) :to
(:result
1) :target value
))
1264 (:arg-types
* tagged-num
)
1265 (:results
(value :scs
(descriptor-reg any-reg
)))
1270 (inst mov value
(make-ea :qword
:base object
:index value
1271 :scale
(ash 1 (- word-shift n-fixnum-tag-bits
))))))
1273 ;;; Turn more arg (context, count) into a list.
1274 (define-vop (listify-rest-args)
1275 (:translate %listify-rest-args
)
1277 (:args
(context :scs
(descriptor-reg) :target src
)
1278 (count :scs
(any-reg) :target rcx
))
1279 (:arg-types
* tagged-num
)
1280 (:temporary
(:sc unsigned-reg
:offset rsi-offset
:from
(:argument
0)) src
)
1281 (:temporary
(:sc unsigned-reg
:offset rcx-offset
:from
(:argument
1)) rcx
)
1282 (:temporary
(:sc unsigned-reg
:offset rax-offset
) rax
)
1283 (:temporary
(:sc unsigned-reg
) dst
)
1284 (:results
(result :scs
(descriptor-reg)))
1287 (let ((enter (gen-label))
1290 (stack-allocate-p (node-stack-allocate-p node
)))
1293 ;; Check to see whether there are no args, and just return NIL if so.
1294 (inst mov result nil-value
)
1296 (inst lea dst
(make-ea :qword
:index rcx
:scale
(ash 2 (- word-shift n-fixnum-tag-bits
))))
1297 (maybe-pseudo-atomic stack-allocate-p
1298 (allocation dst dst node stack-allocate-p list-pointer-lowtag
)
1299 ;; Set up the result.
1301 ;; Jump into the middle of the loop, 'cause that's where we want
1305 ;; Compute a pointer to the next cons.
1306 (inst add dst
(* cons-size n-word-bytes
))
1307 ;; Store a pointer to this cons in the CDR of the previous cons.
1308 (storew dst dst -
1 list-pointer-lowtag
)
1310 ;; Grab one value and stash it in the car of this cons.
1311 (inst mov rax
(make-ea :qword
:base src
))
1312 (inst sub src n-word-bytes
)
1313 (storew rax dst
0 list-pointer-lowtag
)
1314 ;; Go back for more.
1315 (inst sub rcx
(fixnumize 1))
1317 ;; NIL out the last cons.
1318 (storew nil-value dst
1 list-pointer-lowtag
))
1319 (emit-label done
))))
1321 ;;; Return the location and size of the &MORE arg glob created by
1322 ;;; COPY-MORE-ARG. SUPPLIED is the total number of arguments supplied
1323 ;;; (originally passed in RCX). FIXED is the number of non-rest
1326 ;;; We must duplicate some of the work done by COPY-MORE-ARG, since at
1327 ;;; that time the environment is in a pretty brain-damaged state,
1328 ;;; preventing this info from being returned as values. What we do is
1329 ;;; compute supplied - fixed, and return a pointer that many words
1330 ;;; below the current stack top.
1331 (define-vop (more-arg-context)
1332 (:policy
:fast-safe
)
1333 (:translate sb
!c
::%more-arg-context
)
1334 (:args
(supplied :scs
(any-reg) :target count
))
1335 (:arg-types positive-fixnum
(:constant fixnum
))
1337 (:results
(context :scs
(descriptor-reg))
1338 (count :scs
(any-reg)))
1339 (:result-types t tagged-num
)
1340 (:note
"more-arg-context")
1342 (move count supplied
)
1343 ;; SP at this point points at the last arg pushed.
1344 ;; Point to the first more-arg, not above it.
1345 (inst lea context
(make-ea :qword
:base rsp-tn
1347 :scale
(ash 1 (- word-shift n-fixnum-tag-bits
))
1348 :disp
(- (* (1+ fixed
) n-word-bytes
))))
1349 (unless (zerop fixed
)
1350 (inst sub count
(fixnumize fixed
)))))
1352 (define-vop (verify-arg-count)
1353 (:policy
:fast-safe
)
1354 (:args
(nargs :scs
(any-reg)))
1355 (:arg-types positive-fixnum
(:constant t
) (:constant t
))
1358 (:save-p
:compute-only
)
1360 (let ((err-lab (generate-error-code vop
'invalid-arg-count-error
)))
1363 (inst test nargs nargs
)
1364 (inst cmp nargs
(fixnumize max
)))
1365 (inst jmp
:ne err-lab
))
1368 (inst cmp nargs
(fixnumize min
))
1369 (inst jmp
:b err-lab
))
1370 (inst cmp nargs
(fixnumize max
))
1371 (inst jmp
:a err-lab
))
1373 (inst cmp nargs
(fixnumize min
))
1374 (inst jmp
:b err-lab
))))))
1376 ;;; Various other error signallers.
1377 (macrolet ((def (name error translate
&rest args
)
1378 `(define-vop (,name
)
1380 `((:policy
:fast-safe
)
1381 (:translate
,translate
)))
1382 (:args
,@(mapcar (lambda (arg)
1383 `(,arg
:scs
(any-reg descriptor-reg
1384 control-stack constant
)))
1387 (:save-p
:compute-only
)
1389 (error-call vop
',error
,@args
)))))
1390 (def arg-count-error invalid-arg-count-error
1391 sb
!c
::%arg-count-error nargs fname
)
1392 (def type-check-error object-not-type-error sb
!c
::%type-check-error
1394 (def layout-invalid-error layout-invalid-error sb
!c
::%layout-invalid-error
1396 (def odd-key-args-error odd-key-args-error
1397 sb
!c
::%odd-key-args-error
)
1398 (def unknown-key-arg-error unknown-key-arg-error
1399 sb
!c
::%unknown-key-arg-error key
)
1400 (def nil-fun-returned-error nil-fun-returned-error nil fun
))
1402 ;; Signal an error about an untagged number.
1403 ;; These are pretty much boilerplate and could be generic except:
1404 ;; - the names of the SCs could differ between backends (or maybe not?)
1405 ;; - in the "/c" case, the older backends don't eval the errcode
1406 ;; And the 6 vops above ought to be generic too...
1407 ;; FIXME: there are still some occurrences of
1408 ;; note: doing signed word to integer coercion
1409 ;; in regard to SB-C::%TYPE-CHECK-ERROR. Figure out why.
1410 (define-vop (type-check-error/word
)
1411 (:policy
:fast-safe
)
1412 (:translate sb
!c
::%type-check-error
)
1413 (:args
(object :scs
(signed-reg unsigned-reg
))
1414 ;; Types are trees of symbols, so 'any-reg' is not
1416 (type :scs
(any-reg descriptor-reg
)))
1417 (:arg-types untagged-num
*)
1419 (:save-p
:compute-only
)
1420 ;; cost is a smidgen less than type-check-error
1421 ;; otherwise this does not get selected.
1423 (error-call vop
'object-not-type-error object type
)))
1424 (define-vop (type-check-error/word
/c
)
1425 (:policy
:fast-safe
)
1426 (:translate sb
!c
::%type-check-error
/c
)
1427 (:args
(object :scs
(signed-reg unsigned-reg
)))
1428 (:arg-types untagged-num
(:constant symbol
))
1431 (:save-p
:compute-only
)
1432 (:generator
899 ; smidgen less than type-check-error/c
1433 (error-call vop errcode object
)))
1437 (defun emit-single-step-test ()
1438 ;; We use different ways of representing whether stepping is on on
1439 ;; +SB-THREAD / -SB-THREAD: on +SB-THREAD, we use a slot in the
1440 ;; thread structure. On -SB-THREAD we use the value of a static
1441 ;; symbol. Things are done this way, since reading a thread-local
1442 ;; slot from a symbol would require an extra register on +SB-THREAD,
1443 ;; and reading a slot from a thread structure would require an extra
1444 ;; register on -SB-THREAD. While this isn't critical for x86-64,
1445 ;; it's more serious for x86.
1447 (inst cmp
(make-ea :qword
1448 :base thread-base-tn
1449 :disp
(* thread-stepping-slot n-word-bytes
))
1452 (inst cmp
(make-ea :qword
1453 :disp
(+ nil-value
(static-symbol-offset
1454 'sb
!impl
::*stepping
*)
1455 (* symbol-value-slot n-word-bytes
)
1456 (- other-pointer-lowtag
)))
1459 (define-vop (step-instrument-before-vop)
1460 (:policy
:fast-safe
)
1463 (emit-single-step-test)
1465 (inst break single-step-before-trap
)
1467 (note-this-location vop
:step-before-vop
)))