home *** CD-ROM | disk | FTP | other *** search
- ;;; -*- Package: RT; Log: c.log -*-
- ;;;
- ;;; **********************************************************************
- ;;; 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: memory.lisp,v 1.1 91/02/18 15:07:59 chiles Exp $
- ;;;
- ;;; This file contains the IBM RT definitions of some general purpose memory
- ;;; reference VOPs inherited by basic memory reference operations.
- ;;;
- ;;; Written by Rob MacLachlan
- ;;;
- ;;; Converted by Bill Chiles.
- ;;;
-
- (in-package "RT")
-
-
- ;;; CELL-REF -- VOP.
- ;;; CELL-SET -- VOP.
- ;;; CELL-SETF -- VOP.
- ;;; CELL-SETF-FUNCTION -- VOP.
- ;;;
- ;;; CELL-REF and CELL-SET are used to define VOPs like CAR, where the offset to
- ;;; be read or written is a property of the VOP used. CELL-SETF is similar to
- ;;; CELL-SET, but delivers the new value as the result. CELL-SETF-FUNCTION
- ;;; takes its arguments as if it were a setf function (new value first, as
- ;;; apposed to a setf macro, which takes the new value last).
- ;;;
- (define-vop (cell-ref)
- (:args (object :scs (descriptor-reg)))
- (:results (value :scs (word-pointer-reg descriptor-reg any-reg)))
- (:variant-vars offset lowtag)
- (:policy :fast-safe)
- (:generator 4
- (loadw value object offset lowtag)))
- ;;;
- (define-vop (cell-set)
- (:args (object :scs (descriptor-reg))
- (value :scs (word-pointer-reg descriptor-reg any-reg)))
- (:variant-vars offset lowtag)
- (:policy :fast-safe)
- (:generator 4
- (storew value object offset lowtag)))
- ;;;
- (define-vop (cell-setf)
- (:args (object :scs (descriptor-reg))
- (value :scs (word-pointer-reg descriptor-reg any-reg)
- :target result))
- (:results (result :scs (descriptor-reg any-reg)))
- (:variant-vars offset lowtag)
- (:policy :fast-safe)
- (:generator 4
- (storew value object offset lowtag)
- (move result value)))
- ;;;
- (define-vop (cell-setf-function)
- (:args (value :scs (word-pointer-reg descriptor-reg any-reg)
- :target result)
- (object :scs (descriptor-reg)))
- (:results (result :scs (descriptor-reg any-reg)))
- (:variant-vars offset lowtag)
- (:policy :fast-safe)
- (:generator 4
- (storew value object offset lowtag)
- (move result value)))
-
- ;;; DEFINE-CELL-ACCESSORS -- Interface.
- ;;;
- ;;; Define accessor VOPs for some cells in an object. If the operation name is
- ;;; NIL, then that operation isn't defined. If the translate function is null,
- ;;; then we don't define a translation.
- ;;;
- (defmacro define-cell-accessors (offset lowtag ref-op ref-trans set-op set-trans)
- `(progn
- ,@(when ref-op
- `((define-vop (,ref-op cell-ref)
- (:variant ,offset ,lowtag)
- ,@(when ref-trans
- `((:translate ,ref-trans))))))
- ,@(when set-op
- `((define-vop (,set-op cell-setf)
- (:variant ,offset ,lowtag)
- ,@(when set-trans
- `((:translate ,set-trans))))))))
-
-
- ;;; SLOT-REF -- VOP.
- ;;; SLOT-SET -- VOP.
- ;;;
- ;;; SLOT-REF and SLOT-SET are used to define VOPs like CLOSURE-REF, where the
- ;;; offset is constant at compile time, but varies for different uses. We add
- ;;; in the stardard g-vector overhead.
- ;;;
- (define-vop (slot-ref)
- (:args (object :scs (descriptor-reg)))
- (:results (value :scs (descriptor-reg any-reg)))
- (:variant-vars base lowtag)
- (:info offset)
- (:generator 4
- (loadw value object (+ base offset) lowtag)))
- ;;;
- (define-vop (slot-set)
- (:args (object :scs (descriptor-reg))
- (value :scs (descriptor-reg any-reg)))
- (:variant-vars base lowtag)
- (:info offset)
- (:generator 4
- (storew value object (+ base offset) lowtag)))
-
-
-
- ;;;; Indexed references:
-
- (eval-when (compile eval)
-
- ;;; DEFINE-INDEXER -- Internal.
- ;;;
- ;;; Define some VOPs for indexed memory reference. Unless the index is
- ;;; constant, we must compute an intermediate result in a boxed temporary,
- ;;; since the RT doesn't have any indexed addressing modes.
- ;;;
- (defmacro define-indexer (name write-p op shift &key gross-hack)
- `(define-vop (,name)
- (:args (object :scs (descriptor-reg) :to :eval)
- (index :scs (any-reg immediate)
- ,@(unless (zerop shift) '(:target temp)))
- ,@(when write-p
- '((value :scs (any-reg descriptor-reg) :target result))))
- (:arg-types * tagged-num ,@(when write-p '(*)))
- (:temporary (:scs (interior-reg) :type interior) lip)
- ,@(unless (zerop shift)
- `((:temporary (:scs (non-descriptor-reg)
- :type random :from (:argument 1))
- temp)))
- (:results (,(if write-p 'result 'value)
- :scs (any-reg descriptor-reg)))
- (:result-types *)
- (:variant-vars offset lowtag)
- (:policy :fast-safe)
- (:generator 5
- (sc-case index
- ((immediate)
- (inst ,op value object
- (- (+ (if (and (sc-is index immediate) (zerop (tn-value index)))
- 0
- (ash (tn-value index) (- word-shift ,shift)))
- (ash offset word-shift))
- lowtag))
- ,@(if write-p
- '((move result value))))
- (t
- ,@(if (zerop shift)
- ;; Object must be the last arg to CAS here since it is cannot
- ;; be in R0.
- `((inst cas lip index object))
- `((move temp index)
- (inst sr temp ,shift)
- (inst cas lip temp object)))
- (inst ,op value lip (- (ash offset word-shift) lowtag))
- ,@(if write-p
- '((move result value)))))
- ;; The RT lacks a signed-byte load instruction, so we have to sign
- ;; extend this case explicitly. This is gross but obvious and easy.
- ,@(when gross-hack
- '((inst sl value 24)
- (inst sar value 24))))))
-
- ) ;EVAL-WHEN
-
- (define-indexer word-index-ref nil l 0)
- (define-indexer word-index-set t st 0)
- (define-indexer halfword-index-ref nil lh 1)
- (define-indexer signed-halfword-index-ref nil lha 1)
- (define-indexer halfword-index-set t sth 1)
- (define-indexer byte-index-ref nil lc 2)
- (define-indexer signed-byte-index-ref nil lc 2 :gross-hack t)
- (define-indexer byte-index-set t stc 2)
-