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- ;;; -*- Package: SPARC -*-
- ;;;
- ;;; **********************************************************************
- ;;; This code was written as part of the Spice Lisp project at
- ;;; Carnegie-Mellon University, and has been placed in the public domain.
- ;;; If you want to use this code or any part of Spice Lisp, please contact
- ;;; Scott Fahlman (FAHLMAN@CMUC).
- ;;; **********************************************************************
- ;;;
- ;;; $Header: nlx.lisp,v 1.4 91/08/31 22:11:00 wlott Exp $
- ;;;
- ;;; This file contains the definitions of VOPs used for non-local exit
- ;;; (throw, lexical exit, etc.)
- ;;;
- ;;; Written by Rob MacLachlan
- ;;;
- (in-package "SPARC")
-
- ;;; MAKE-NLX-SP-TN -- Interface
- ;;;
- ;;; Make an environment-live stack TN for saving the SP for NLX entry.
- ;;;
- (def-vm-support-routine make-nlx-sp-tn (env)
- (environment-live-tn
- (make-representation-tn *fixnum-primitive-type* immediate-arg-scn)
- env))
-
-
-
- ;;; Save and restore dynamic environment.
- ;;;
- ;;; These VOPs are used in the reentered function to restore the appropriate
- ;;; dynamic environment. Currently we only save the Current-Catch and binding
- ;;; stack pointer. We don't need to save/restore the current unwind-protect,
- ;;; since unwind-protects are implicitly processed during unwinding. If there
- ;;; were any additional stacks, then this would be the place to restore the top
- ;;; pointers.
-
-
- ;;; Make-Dynamic-State-TNs -- Interface
- ;;;
- ;;; Return a list of TNs that can be used to snapshot the dynamic state for
- ;;; use with the Save/Restore-Dynamic-Environment VOPs.
- ;;;
- (def-vm-support-routine make-dynamic-state-tns ()
- (make-n-tns 4 *any-primitive-type*))
-
- (define-vop (save-dynamic-state)
- (:results (catch :scs (descriptor-reg))
- (nfp :scs (descriptor-reg))
- (nsp :scs (descriptor-reg))
- (eval :scs (descriptor-reg)))
- (:vop-var vop)
- (:generator 13
- (load-symbol-value catch lisp::*current-catch-block*)
- (let ((cur-nfp (current-nfp-tn vop)))
- (when cur-nfp
- (move nfp cur-nfp)))
- (move nsp nsp-tn)
- (load-symbol-value eval lisp::*eval-stack-top*)))
-
- (define-vop (restore-dynamic-state)
- (:args (catch :scs (descriptor-reg))
- (nfp :scs (descriptor-reg))
- (nsp :scs (descriptor-reg))
- (eval :scs (descriptor-reg)))
- (:vop-var vop)
- (:generator 10
- (store-symbol-value catch lisp::*current-catch-block*)
- (store-symbol-value eval lisp::*eval-stack-top*)
- (let ((cur-nfp (current-nfp-tn vop)))
- (when cur-nfp
- (move cur-nfp nfp)))
- (move nsp-tn nsp)))
-
- (define-vop (current-stack-pointer)
- (:results (res :scs (any-reg descriptor-reg)))
- (:generator 1
- (move res csp-tn)))
-
- (define-vop (current-binding-pointer)
- (:results (res :scs (any-reg descriptor-reg)))
- (:generator 1
- (move res bsp-tn)))
-
-
-
- ;;;; Unwind block hackery:
-
- ;;; Compute the address of the catch block from its TN, then store into the
- ;;; block the current Fp, Env, Unwind-Protect, and the entry PC.
- ;;;
- (define-vop (make-unwind-block)
- (:args (tn))
- (:info entry-label)
- (:results (block :scs (any-reg)))
- (:temporary (:scs (descriptor-reg)) temp)
- (:temporary (:scs (non-descriptor-reg)) ndescr)
- (:generator 22
- (inst add block cfp-tn (* (tn-offset tn) vm:word-bytes))
- (load-symbol-value temp lisp::*current-unwind-protect-block*)
- (storew temp block vm:unwind-block-current-uwp-slot)
- (storew cfp-tn block vm:unwind-block-current-cont-slot)
- (storew code-tn block vm:unwind-block-current-code-slot)
- (inst compute-lra-from-code temp code-tn entry-label ndescr)
- (storew temp block vm:catch-block-entry-pc-slot)))
-
-
- ;;; Like Make-Unwind-Block, except that we also store in the specified tag, and
- ;;; link the block into the Current-Catch list.
- ;;;
- (define-vop (make-catch-block)
- (:args (tn)
- (tag :scs (descriptor-reg)))
- (:info entry-label)
- (:results (block :scs (any-reg)))
- (:temporary (:scs (descriptor-reg)) temp)
- (:temporary (:scs (descriptor-reg) :target block :to (:result 0)) result)
- (:temporary (:scs (non-descriptor-reg)) ndescr)
- (:generator 44
- (inst add result cfp-tn (* (tn-offset tn) vm:word-bytes))
- (load-symbol-value temp lisp::*current-unwind-protect-block*)
- (storew temp result vm:catch-block-current-uwp-slot)
- (storew cfp-tn result vm:catch-block-current-cont-slot)
- (storew code-tn result vm:catch-block-current-code-slot)
- (inst compute-lra-from-code temp code-tn entry-label ndescr)
- (storew temp result vm:catch-block-entry-pc-slot)
-
- (storew tag result vm:catch-block-tag-slot)
- (load-symbol-value temp lisp::*current-catch-block*)
- (storew temp result vm:catch-block-previous-catch-slot)
- (store-symbol-value result lisp::*current-catch-block*)
-
- (move block result)))
-
-
- ;;; Just set the current unwind-protect to TN's address. This instantiates an
- ;;; unwind block as an unwind-protect.
- ;;;
- (define-vop (set-unwind-protect)
- (:args (tn))
- (:temporary (:scs (descriptor-reg)) new-uwp)
- (:generator 7
- (inst add new-uwp cfp-tn (* (tn-offset tn) vm:word-bytes))
- (store-symbol-value new-uwp lisp::*current-unwind-protect-block*)))
-
-
- (define-vop (unlink-catch-block)
- (:temporary (:scs (any-reg)) block)
- (:policy :fast-safe)
- (:translate %catch-breakup)
- (:generator 17
- (load-symbol-value block lisp::*current-catch-block*)
- (loadw block block vm:catch-block-previous-catch-slot)
- (store-symbol-value block lisp::*current-catch-block*)))
-
- (define-vop (unlink-unwind-protect)
- (:temporary (:scs (any-reg)) block)
- (:policy :fast-safe)
- (:translate %unwind-protect-breakup)
- (:generator 17
- (load-symbol-value block lisp::*current-unwind-protect-block*)
- (loadw block block vm:unwind-block-current-uwp-slot)
- (store-symbol-value block lisp::*current-unwind-protect-block*)))
-
-
- ;;;; NLX entry VOPs:
-
-
- (define-vop (nlx-entry)
- (:args (sp) ; Note: we can't list an sc-restriction, 'cause any load vops
- ; would be inserted before the LRA.
- (start)
- (count))
- (:results (values :more t))
- (:temporary (:scs (descriptor-reg)) move-temp)
- (:info label nvals)
- (:save-p :force-to-stack)
- (:generator 30
- (emit-return-pc label)
- (cond ((zerop nvals))
- ((= nvals 1)
- (let ((no-values (gen-label)))
- (inst cmp count)
- (inst b :eq no-values)
- (move (tn-ref-tn values) null-tn)
- (loadw (tn-ref-tn values) start)
- (emit-label no-values)))
- (t
- (collect ((defaults))
- (inst subcc count (fixnum 1))
- (do ((i 0 (1+ i))
- (tn-ref values (tn-ref-across tn-ref)))
- ((null tn-ref))
- (let ((default-lab (gen-label))
- (tn (tn-ref-tn tn-ref)))
- (defaults (cons default-lab tn))
-
- (inst b :lt default-lab)
- (inst subcc count (fixnum 1))
- (sc-case tn
- ((descriptor-reg any-reg)
- (loadw tn start i))
- (control-stack
- (loadw move-temp start i)
- (store-stack-tn tn move-temp)))))
-
- (let ((defaulting-done (gen-label)))
-
- (emit-label defaulting-done)
-
- (assemble (*elsewhere*)
- (dolist (def (defaults))
- (emit-label (car def))
- (let ((tn (cdr def)))
- (sc-case tn
- ((descriptor-reg any-reg)
- (move tn null-tn))
- (control-stack
- (store-stack-tn tn null-tn)))))
- (inst b defaulting-done)
- (inst nop))))))
- (load-stack-tn csp-tn sp)))
-
-
- (define-vop (nlx-entry-multiple)
- (:args (top :target result) (src) (count))
- ;; Again, no SC restrictions for the args, 'cause the loading would
- ;; happen before the entry label.
- (:info label)
- (:temporary (:scs (any-reg)) dst)
- (:temporary (:scs (descriptor-reg)) temp)
- (:results (result :scs (any-reg) :from (:argument 0))
- (num :scs (any-reg) :from (:argument 0)))
- (:save-p :force-to-stack)
- (:generator 30
- (emit-return-pc label)
- (let ((loop (gen-label))
- (done (gen-label)))
-
- ;; Setup results, and test for the zero value case.
- (load-stack-tn result top)
- (inst cmp count)
- (inst b :eq done)
- (inst li num 0)
-
- ;; Compute dst as one slot down from result, because we inc the index
- ;; before we use it.
- (inst sub dst result 4)
-
- ;; Copy stuff down the stack.
- (emit-label loop)
- (inst ld temp src num)
- (inst add num (fixnum 1))
- (inst cmp num count)
- (inst b :ne loop)
- (inst st temp dst num)
-
- ;; Reset the CSP.
- (emit-label done)
- (inst add csp-tn result num))))
-
-
- ;;; This VOP is just to force the TNs used in the cleanup onto the stack.
- ;;;
- (define-vop (uwp-entry)
- (:info label)
- (:save-p :force-to-stack)
- (:results (block) (start) (count))
- (:ignore block start count)
- (:generator 0
- (emit-return-pc label)))
-
-