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;;; -*- Package: HPPA -*-
;;;
;;; **********************************************************************
;;; This code was written as part of the CMU Common 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 CMU Common Lisp, please contact
;;; Scott Fahlman or slisp-group@cs.cmu.edu.
;;;
(ext:file-comment
"$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/hppa/nlx.lisp,v 1.2 1992/07/13 16:08:16 wlott Exp $")
;;;
;;; **********************************************************************
;;;
;;; This file contains the definitions of VOPs used for non-local exit
;;; (throw, lexical exit, etc.)
;;;
;;; Written by William Lott
;;;
(in-package "HPPA")
;;; 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 cur-nfp nfp)))
(move nsp-tn nsp)
(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 nfp cur-nfp)))
(move nsp nsp-tn)))
(define-vop (current-stack-pointer)
(:results (res :scs (any-reg descriptor-reg)))
(:generator 1
(move csp-tn res)))
(define-vop (current-binding-pointer)
(:results (res :scs (any-reg descriptor-reg)))
(:generator 1
(move bsp-tn res)))
;;;; 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 addi (* (tn-offset tn) word-bytes) cfp-tn block)
(load-symbol-value temp lisp::*current-unwind-protect-block*)
(storew temp block unwind-block-current-uwp-slot)
(storew cfp-tn block unwind-block-current-cont-slot)
(storew code-tn block unwind-block-current-code-slot)
(inst compute-lra-from-code code-tn entry-label ndescr temp)
(storew temp block 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) :from (:argument 0)))
(:temporary (:scs (descriptor-reg)) temp)
(:temporary (:scs (non-descriptor-reg)) ndescr)
(:generator 44
(inst addi (* (tn-offset tn) word-bytes) cfp-tn block)
(load-symbol-value temp lisp::*current-unwind-protect-block*)
(storew temp block catch-block-current-uwp-slot)
(storew cfp-tn block catch-block-current-cont-slot)
(storew code-tn block catch-block-current-code-slot)
(inst compute-lra-from-code code-tn entry-label ndescr temp)
(storew temp block catch-block-entry-pc-slot)
(storew tag block catch-block-tag-slot)
(load-symbol-value temp lisp::*current-catch-block*)
(storew temp block catch-block-previous-catch-slot)
(store-symbol-value block lisp::*current-catch-block*)))
;;; 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 addi (* (tn-offset tn) word-bytes) cfp-tn new-uwp)
(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 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 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)
(:vop-var vop)
(:generator 30
(emit-return-pc label)
(note-this-location vop :non-local-entry)
(cond ((zerop nvals))
((= nvals 1)
(inst comclr count zero-tn zero-tn :<>)
(inst move null-tn (tn-ref-tn values) :tr)
(loadw (tn-ref-tn values) start))
(t
(collect ((defaults))
(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 bci := nil (fixnum i) count default-lab)
(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*)
(do ((defs (defaults) (cdr defs)))
((null defs))
(let ((def (car defs)))
(emit-label (car def))
(unless (cdr defs)
(inst b defaulting-done))
(let ((tn (cdr def)))
(sc-case tn
((descriptor-reg any-reg)
(move null-tn tn))
(control-stack
(store-stack-tn tn null-tn)))))))))))
(load-stack-tn csp-tn sp)))
(define-vop (nlx-entry-multiple)
(:args (top :target dst) (start :target src) (count :target num))
;; Again, no SC restrictions for the args, 'cause the loading would
;; happen before the entry label.
(:info label)
(:temporary (:scs (any-reg) :from (:argument 0)) dst)
(:temporary (:scs (any-reg) :from (:argument 1)) src)
(:temporary (:scs (any-reg) :from (:argument 2)) num)
(:temporary (:scs (descriptor-reg)) temp)
(:results (new-start) (new-count))
(:save-p :force-to-stack)
(:vop-var vop)
(:generator 30
(emit-return-pc label)
(note-this-location vop :non-local-entry)
;; Copy args.
(load-stack-tn dst top)
(move start src)
(move count num)
;; Establish results.
(sc-case new-start
(any-reg (move dst new-start))
(control-stack (store-stack-tn new-start dst)))
(inst comb := num zero-tn done)
(sc-case new-count
(any-reg (inst move num new-count))
(control-stack (store-stack-tn new-count num)))
;; Load the first word.
(inst ldwm word-bytes src temp)
;; Copy stuff on stack.
LOOP
(inst stwm temp word-bytes dst)
(inst addib :<> (fixnum -1) num loop :nullify t)
(inst ldwm word-bytes src temp)
DONE
(inst move dst csp-tn)))
;;; 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)
(:vop-var vop)
(:generator 0
(emit-return-pc label)
(note-this-location vop :non-local-entry)))