source: branches/lispworks/woodequ.lisp@ 41

;;;-*- Mode: Lisp; Package: WOOD -*-

;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; woodequ.lisp
;; Data representation constants
;; Largely copied from "ccl:library;lispequ.lisp"
;;
;; Portions Copyright © 2006 Clozure Associates
;; Copyright © 1996 Digitool, Inc.
;; Copyright © 1992-1995 Apple Computer, Inc.
;; All rights reserved.
;; Permission is given to use, copy, and modify this software provided
;; that Digitool is given credit in all derivative works.
;; This software is provided "as is". Digitool makes no warranty or
;; representation, either express or implied, with respect to this software,
;; its quality, accuracy, merchantability, or fitness for a particular
;; purpose.
;;

;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Modification History
;;
;; 02/01/06 gz    LispWorks port
;; -------------- 0.96
;; -------------- 0.95
;; 05/09/96 bill  use addr+ in dc-%arrayh-xxx
;; -------------- 0.94 = MCL-PPC 3.9
;; 03/21/96 bill  add $v_xstr
;; -------------- 0.93
;; -------------- 0.9
;; 01/18/95 bill  $btree.max-key-size
;; -------------- 0.8
;; 03/27/93 bill  $forwarding-pointer-header
;; -------------- 0.6
;; 08/27/92 bill  $v_load-function
;; 08/24/92 bill  $btree-type_string-equal-bit, $btree-type_string-equal
;;                (these are not yet supported by the btree code)
;; -------------- 0.5
;; 06/23/92 bill  persistent-clos equates, btree type bits
;; -------------- 0.1
;;


(in-package :wood)

; low 3 bits of an address are the tag.

(defmacro pointer-tag (pointer)
  `(the fixnum (logand ,pointer 7)))

(defmacro pointer-tagp (pointer tag)
  `(eql (pointer-tag ,pointer) ,tag))
            
(defmacro pointer-address (pointer)
  `(logand ,pointer -8))

#+ccl (progn
(defconstant $t_fixnum 0)
(defconstant $t_vector 1)
(defconstant $t_symbol 2)
(defconstant $t_dfloat 3)
(defconstant $t_cons 4)
(defconstant $t_sfloat 5)
(defconstant $t_lfun 6)
(defconstant $t_imm 7)

(defconstant $dfloat_size 8)

(defmacro tag-vector (&key fixnum vector symbol dfloat cons sfloat lfun imm)
  (vector fixnum vector symbol dfloat cons sfloat lfun imm))

) ;#+ccl

#+LispWorks (progn
(defconstant $t_pos_fixnum 0)
(defconstant $t_vector 1)
(defconstant $t_symbol 2)
(defconstant $t_dfloat 3)
(defconstant $t_cons 4)
(defconstant $t_neg_fixnum 5)
(defconstant $t_char 6)
(defconstant $t_imm 7)

(defconstant $undefined-imm 0)

(defmacro tag-vector (&key pos-fixnum vector symbol dfloat cons neg-fixnum char imm)
  (vector pos-fixnum vector symbol dfloat cons neg-fixnum char imm))

) ;#+LispWorks


; Non-cons cells have a header long-word for the garbage collector.
(defconstant $vector-header #x1ff)
(defconstant $symbol-header #x8ff)
; Need to find a value that can't be the first word of a float
(defconstant $forwarding-pointer-header #xfff)

; Vectors are a longword of block header, 1 byte of subtype, 3 bytes of length (in bytes)
; then the contents.
;
;  -------------------
; | 00 | 00 | 01 | FF |
; |-------------------|
; | ST |    Length    |
; |-------------------|
; |     Contents      |
; |         .         |
; |         .         |
; |         .         |
;  -------------------

; Array subtypes. Multiply by two to get the MCL subtype
;(defconstant $v_packed_sstr 0)          ; used in image loader/dumper
(defconstant $v_bignum 1)
(defconstant $v_macptr 2)
(defconstant $v_badptr 3)
(defconstant $v_nlfunv 4)               ; Lisp FUNction vector
;subtype 5 unused
(defconstant $v_min_arr 6)
(defconstant $v_xstr 6)      ;16-bit character vector
(defconstant $v_ubytev 7)    ;unsigned byte vector
(defconstant $v_uwordv 8)    ;unsigned word vector
(defconstant $v_floatv 9)    ;float vector
(defconstant $v_slongv 10)   ;Signed long vector
(defconstant $v_ulongv 11)   ;Unsigned long vector
(defconstant $v_bitv 12)     ;Bit vector
(defconstant $v_sbytev 13)   ;Signed byte vector
(defconstant $v_swordv 14)   ;Signed word vector
(defconstant $v_sstr 15)     ;simple string
(defconstant $v_genv 16)     ;simple general vector
(defconstant $v_arrayh 17)   ;complex array header
(defconstant $v_struct 18)   ;structure
(defconstant $v_mark 19)     ;buffer mark
(defconstant $v_pkg 20)
;subtype 21 unused
(defconstant $v_istruct 22)
(defconstant $v_ratio 23)
(defconstant $v_complex 24)
(defconstant $v_instance 25) ;clos instance
; subtypes 26, 27, 28 unused in ccl
#+LispWorks (defconstant $v_garrayh 26)
#+LispWorks (defconstant $v_iarrayh 27)
(defconstant $v_weakh 29)
(defconstant $v_poolfreelist 30)
(defconstant $v_nhash 31)

; Types that exist only in the database
(defconstant $v_area 32)                ; area descriptor
(defconstant $v_segment 33)             ; area segment
(defconstant $v_random-bits 34)         ; used for vectors of random bits, e.g. resources
(defconstant $v_dbheader 35)            ; database header
(defconstant $v_segment-headers 36)     ; Segment headers page.
(defconstant $v_btree 37)               ; a BTREE
(defconstant $v_btree-node 38)          ; one node of a BTREE's tree.
(defconstant $v_class 39)               ; class
(defconstant $v_load-function 40)       ; result of P-MAKE-LOAD-FUNCTION-OBJECT
(defconstant $v_pload-barrier 41)       ; result of P-MAKE-PLOAD-BARRIER

(defconstant $v_link (- $t_vector))
(defconstant $V_SUBTYPE 3)
(defconstant $V_DATA 7)
(defconstant $V_LOG 3)
(defconstant $vector-header-size 8)

(defconstant $vnodebit 5)               ; set for arrays containing pointers
(defconstant $vnode (ash 1 $vnodebit))

; NIL is tagged as a cons with and address of 0
(defconstant $pheap-nil $t_cons)

(defmacro vtype-vector (&key unused
                             (bignum unused) (badptr unused) (nlfunv unused)
                             (xstr unused) (ubytev unused) (uwordv unused)
                             (floatv unused) (slongv unused) (ulongv unused)
                             (bitv unused) (sbytev unused) (swordv unused)
                             (sstr unused) (genv unused) (arrayh unused)
                             (struct unused) (pkg unused) (istruct unused)
                             (ratio unused) (complex unused) (instance unused)
                             (weakh unused) (poolfreelist unused) (nhash unused)
                             ;; Simple-arrays other than special vectors above
                             (garrayh unused) (iarrayh unused)
                             ;; internal subtypes
                             area segment random-bits dbheader segment-headers
                             btree btree-node class load-function pload-barrier)
  (vector unused          ; 0 - unused
          bignum          ; 1 - $v_bignum
          unused          ; 2 - $v_macptr - not supported
          badptr          ; 3 - $v_badptr
          nlfunv          ; 4 - $v_nlfunv
          unused          ; 5 - unused
          xstr            ; 6 - $v_xstr - extended string
          ubytev          ; 7 - $v_ubytev - unsigned byte vector
          uwordv          ; 8 - $v_uwordv - unsigned word vector
          floatv          ; 9 - $v_floatv - float vector
          slongv          ; 10 - $v_slongv - Signed long vector
          ulongv          ; 11 - $v_ulongv - Unsigned long vector
          bitv            ; 12 - $v_bitv - Bit vector (handled specially)
          sbytev          ; 13 - $v_sbytev - Signed byte vector
          swordv          ; 14 - $v_swordv - Signed word vector
          sstr            ; 15 - $v_sstr - simple string
          genv            ; 16 - $v_genv - simple general vector
          arrayh          ; 17 - $v_arrayh - complex array header
          struct          ; 18 - $v_struct - structure
          unused          ; 19 - $v_mark - buffer mark unimplemented
          pkg             ; 20 - $v_pkg
          unused          ; 21 - unused
          istruct         ; 22 - $v_istruct - type in first element
          ratio           ; 23 - $v_ratio
          complex         ; 24 - $v_complex
          instance        ; 25 - $v_instance - clos instance
          garrayh         ; 26 - $v_garrayh - simple general array header
          iarrayh         ; 27 - $v_iarrayh - simple immediate array header
          unused          ; 28 - unused
          weakh           ; 29 - $v_weakh - weak list header
          poolfreelist    ; 30 - $v_poolfreelist - free pool header
          nhash           ; 31 - $v_nhash
         ; WOOD specific subtypes
          area            ; 32 - $v_area - area descriptor
          segment         ; 33 - $v_segment - area segment
          random-bits     ; 34 - $v_random-bits - vectors of random bits, e.g. resources
          dbheader        ; 35 - $v_dbheader - database header
          segment-headers ; 36 - $v_segment-headers - specially allocated
          btree           ; 37 - $v_btree
          btree-node      ; 38 - $v_btree-node - specially allocated
          class           ; 39 - $v_class
          load-function   ; 40 - $v_load-function
          pload-barrier   ;41 - $v_pload-barrier
    ))

(defmacro def-indices (&body indices)
  (let ((index 0)
        res)
    (dolist (spec indices)
      (labels ((f (spec)
                 (etypecase spec
                   (symbol (push `(defconstant ,spec ,index) res))
                   (list (dolist (sub-spec spec)
                           (f sub-spec))))))
        (declare (dynamic-extent #'f))
        (f spec)
        (incf index)))
    `(progn ,@(nreverse res))))

; Symbols are not regular vectors.
(defconstant $sym_header -2)            ; $symbol-header
(defconstant $sym_pname 2)
(defconstant $sym_package 6)
(defconstant $sym_values 10)            ; place for (value function . plist)
(defconstant $symbol-size 16)

; Packages do not support inheritance.
; maybe they should.
(def-indices
  $pkg.names
  $pkg.btree
  $pkg-length)

; Weak lists. Subtype $v_weakh
(def-indices
  $population.gclink
  $population.type
  $population.data
  $population-size)

;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; A PHEAP file starts with a single vector containing
;; the root objects and the file-wide information.
;;
(defconstant $block-overhead 8)         ; commit-lsn + segment-ptr
(defconstant $block-commit-lsn 0)
(defconstant $block-segment-ptr 4)

(defconstant $root-vector (+ $block-overhead $t_vector))

(def-indices
  $pheap.version                        ; version number
  $pheap.free-page                      ; free pointer in pages
  $pheap.root                           ; root object
  $pheap.default-consing-area           ; a pointer to an area descriptor
  $pheap.class-hash                     ; class hash table
  $pheap.page-size                      ; size of a page in bytes
  $pheap.btree-free-list                ; head of linked list of btree nodes
  $pheap.package-btree                  ; string->package table
  $pheap.page-write-count               ; pages written since open
  $pheap-free9
  $pheap-free10
  $pheap-free11
  $pheap-free12
  $pheap-free13
  $pheap-free14
  $pheap-free15
  $pheap-header-size
  )

; A segment headers page header. Subtype is $v_segment-headers
; The header in the first page of headers for an area
; contains the $area.xxx information as well.
(def-indices
  $segment-headers.area                 ; my area
  $segment-headers.link                 ; next segment headers page
  $area.flags                           ; fixnum
  $area.segment-size                    ; default size for segments
  $area.last-headers                    ; last segment headers page
  $area.free-count                      ; number of headers left in $area.last-headers
  $area.free-ptr                        ; cons pointing at current header
  $area-descriptor-size
  )

(defconstant $segment-headers-size $area.flags)

; A segment header page entry
; Pointers to these are typed as conses
(defconstant $segment-header_free -4)   ; pointer to free space. Tagged as a cons
(defconstant $segment-header_freebytes 0)       ; number of bytes left
(defconstant $segment-header_free-link 4)       ; header entry with free space
(defconstant $segment-header_segment 8)         ; beginning of the segment
(defconstant $segment-header-entry-bytes (* 4 4))       ; must be a multiple of 8

; The header of a segment. Subtype is $v_segment
; This vector contains all other types of objects
(def-indices
  $segment.area                         ; my area
  $segment.header                       ; my header entry
  $segment-header-size
  )

; Complex array headers
; Copied from lispequ.
(def-indices
  $arh.fixnum
  $arh.offs
  $arh.vect
  #+LispWorks $arh.etype
  ($arh.vlen $arh.dims)
  $arh.fill)

;byte offsets in arh.fixnum slot.
(defconstant $arh_rank4 0)              ;4*rank
(defconstant $arh_type 2)               ;vector subtype
(defconstant $arh_bits 3)               ;Flags

(defconstant $arh_one_dim 4)            ;arh.rank4 value of one-dim arrays

;Bits in $arh_bits.
(defconstant $arh_adjp_bit 7)           ;adjustable-p
(defconstant $arh_fill_bit 6)           ;fill-pointer-p
(defconstant $arh_disp_bit 5)           ;displaced to another array header -p
(defconstant $arh_simple_bit 4)         ;not adjustable, no fill-pointer and
                                        ; not user-visibly displaced -p

(defmacro dc-%arrayh-bits (disk-cache pointer)
  (setq disk-cache (require-type disk-cache 'symbol))
  `(the fixnum
        (read-8-bits ,disk-cache
                     (addr+ ,disk-cache
                            ,pointer
                            (+ $v_data (* 4 $arh.fixnum) $arh_bits)))))

(defmacro dc-%arrayh-type (disk-cache pointer)
  (setq disk-cache (require-type disk-cache 'symbol))
  `(the fixnum
        (read-8-bits ,disk-cache
                     (addr+ ,disk-cache
                            ,pointer
                            (+ $v_data (* 4 $arh.fixnum) $arh_type)))))

(defmacro dc-%arrayh-rank4 (disk-cache pointer)
  (setq disk-cache (require-type disk-cache 'symbol))
  `(the fixnum
        (read-unsigned-word
         ,disk-cache
         (addr+ ,disk-cache
                ,pointer
                (+ $v_data (* 4 $arh.fixnum) $arh_rank4)))))

(defmacro arh.fixnum_type-bytespec ()
  (byte 8 5))

(defmacro arh.fixnum_type (fixnum)
  `(ldb (arh.fixnum_type-bytespec) ,fixnum))

;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; btree vector - subtype $v_btree
;;;
(def-indices
  $btree.root                           ; the root node
  $btree.count                          ; number of leaf entries
  $btree.depth                          ; 0 means only the root exists
  $btree.nodes                          ; total number of nodes
  $btree.first-leaf                     ; first leaf node. A constant
  $btree.type                           ; type bits
  $btree.max-key-size                   ; maximum size of a key
  $btree-size                           ; length of a $v_btree vector
  )

;; Btree type bits
(defconstant $btree-type_eqhash-bit 0)          ; EQ hash table
(defconstant $btree-type_weak-bit 1)    ; weak hash table
(defconstant $btree-type_weak-value-bit 2)      ; weak on value, not key
(defconstant $btree-type_string-equal-bit 3)    ; use string-equal, not string=

; Btree type values
(defconstant $btree-type_normal 0)      ; normal string->value btree
(defconstant $btree-type_string-equal (ash 1 $btree-type_string-equal-bit))
(defconstant $btree-type_eqhash (ash 1 $btree-type_eqhash-bit))
(defconstant $btree-type_eqhash-weak-key
  (+ $btree-type_eqhash (ash 1 $btree-type_weak-bit)))
(defconstant $btree-type_eqhash-weak-value
  (+ $btree-type_eqhash-weak-key (ash 1 $btree-type_weak-value-bit)))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Persistent CLOS equates
;;;

; subtype $v_instance
(def-indices
  $instance.wrapper                     ; class wrapper
  $instance.slots                       ; slots vector
  $instance-size)

; A wrapper is a regular general vector
(def-indices
  $wrapper.class
  $wrapper.slots                        ; vector of slot names
  $wrapper-size)

; subtype $v_class
(def-indices
  $class.name
  $class.own-wrapper
  $class-size)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; $v_load-function subtype
;;;
(def-indices
  $load-function.load-list              ; load-function.args
  $load-function.init-list              ; init-function.args
  $load-function-size)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; $v_pload-barrier subtype
;;;

(def-indices
  $pload-barrier.object
  $pload-barrier-size)


(provide :woodequ)
;;;    1   3/10/94  bill         1.8d247
;;;    2   7/26/94  Derek        1.9d027
;;;    2   2/18/95  RŽti         1.10d019
;;;    3   3/23/95  bill         1.11d010