0.pre7.82:
[sbcl.git] / src / compiler / generic / genesis.lisp
index 9cf61ef..ed4db16 100644 (file)
 (defstruct (gspace (:constructor %make-gspace)
                   (:copier nil))
   ;; name and identifier for this GSPACE
-  (name (required-argument) :type symbol :read-only t)
-  (identifier (required-argument) :type fixnum :read-only t)
+  (name (missing-arg) :type symbol :read-only t)
+  (identifier (missing-arg) :type fixnum :read-only t)
   ;; the word address where the data will be loaded
-  (word-address (required-argument) :type unsigned-byte :read-only t)
+  (word-address (missing-arg) :type unsigned-byte :read-only t)
   ;; the data themselves. (Note that in CMU CL this was a pair
   ;; of fields SAP and WORDS-ALLOCATED, but that wasn't very portable.)
   (bytes (make-array target-space-alignment :element-type '(unsigned-byte 8))
         :type (simple-array (unsigned-byte 8) 1))
   ;; the index of the next unwritten word (i.e. chunk of
-  ;; SB!VM:WORD-BYTES bytes) in BYTES, or equivalently the number of
+  ;; SB!VM:N-WORD-BYTES bytes) in BYTES, or equivalently the number of
   ;; words actually written in BYTES. In order to convert to an actual
-  ;; index into BYTES, thus must be multiplied by SB!VM:WORD-BYTES.
+  ;; index into BYTES, thus must be multiplied by SB!VM:N-WORD-BYTES.
   (free-word-index 0))
 
 (defun gspace-byte-address (gspace)
   ;; the GSPACE that this descriptor is allocated in, or NIL if not set yet.
   (gspace nil :type (or gspace null))
   ;; the offset in words from the start of GSPACE, or NIL if not set yet
-  (word-offset nil :type (or (unsigned-byte #.sb!vm:word-bits) null))
+  (word-offset nil :type (or (unsigned-byte #.sb!vm:n-word-bits) null))
   ;; the high and low halves of the descriptor
   ;;
   ;; KLUDGE: Judging from the comments in genesis.lisp of the CMU CL
 (def!method print-object ((des descriptor) stream)
   (let ((lowtag (descriptor-lowtag des)))
     (print-unreadable-object (des stream :type t)
-      (cond ((or (= lowtag sb!vm:even-fixnum-type)
-                (= lowtag sb!vm:odd-fixnum-type))
+      (cond ((or (= lowtag sb!vm:even-fixnum-lowtag)
+                (= lowtag sb!vm:odd-fixnum-lowtag))
             (let ((unsigned (logior (ash (descriptor-high des)
                                          (1+ (- descriptor-low-bits
-                                                sb!vm:lowtag-bits)))
+                                                sb!vm:n-lowtag-bits)))
                                     (ash (descriptor-low des)
-                                         (- 1 sb!vm:lowtag-bits)))))
+                                         (- 1 sb!vm:n-lowtag-bits)))))
               (format stream
                       "for fixnum: ~D"
                       (if (> unsigned #x1FFFFFFF)
                           (- unsigned #x40000000)
                           unsigned))))
-           ((or (= lowtag sb!vm:other-immediate-0-type)
-                (= lowtag sb!vm:other-immediate-1-type))
+           ((or (= lowtag sb!vm:other-immediate-0-lowtag)
+                (= lowtag sb!vm:other-immediate-1-lowtag))
             (format stream
                     "for other immediate: #X~X, type #b~8,'0B"
-                    (ash (descriptor-bits des) (- sb!vm:type-bits))
-                    (logand (descriptor-low des) sb!vm:type-mask)))
+                    (ash (descriptor-bits des) (- sb!vm:n-widetag-bits))
+                    (logand (descriptor-low des) sb!vm:widetag-mask)))
            (t
             (format stream
                     "for pointer: #X~X, lowtag #b~3,'0B, ~A"
 ;;; is needed, we grow the GSPACE. The descriptor returned is a
 ;;; pointer of type LOWTAG.
 (defun allocate-cold-descriptor (gspace length lowtag)
-  (let* ((bytes (round-up length (ash 1 sb!vm:lowtag-bits)))
+  (let* ((bytes (round-up length (ash 1 sb!vm:n-lowtag-bits)))
         (old-free-word-index (gspace-free-word-index gspace))
         (new-free-word-index (+ old-free-word-index
                                 (ash bytes (- sb!vm:word-shift)))))
     ;; NEW-FREE-WORD-INDEX.
     (do ()
        ((>= (length (gspace-bytes gspace))
-            (* new-free-word-index sb!vm:word-bytes)))
+            (* new-free-word-index sb!vm:n-word-bytes)))
       (expand-gspace-bytes gspace))
     ;; Now that GSPACE is big enough, we can meaningfully grab a chunk of it.
     (setf (gspace-free-word-index gspace) new-free-word-index)
 
 (defun descriptor-fixnum (des)
   (let ((bits (descriptor-bits des)))
-    (if (logbitp (1- sb!vm:word-bits) bits)
-      ;; KLUDGE: The (- SB!VM:WORD-BITS 2) term here looks right to
-      ;; me, and it works, but in CMU CL it was (1- SB!VM:WORD-BITS),
+    (if (logbitp (1- sb!vm:n-word-bits) bits)
+      ;; KLUDGE: The (- SB!VM:N-WORD-BITS 2) term here looks right to
+      ;; me, and it works, but in CMU CL it was (1- SB!VM:N-WORD-BITS),
       ;; and although that doesn't make sense for me, or work for me,
       ;; it's hard to see how it could have been wrong, since CMU CL
       ;; genesis worked. It would be nice to understand how this came
       ;; to be.. -- WHN 19990901
-      (logior (ash bits -2) (ash -1 (- sb!vm:word-bits 2)))
+      (logior (ash bits -2) (ash -1 (- sb!vm:n-word-bits 2)))
       (ash bits -2))))
 
 ;;; common idioms
     (let ((lowtag (descriptor-lowtag des))
          (high (descriptor-high des))
          (low (descriptor-low des)))
-      (if (or (eql lowtag sb!vm:function-pointer-type)
-             (eql lowtag sb!vm:instance-pointer-type)
-             (eql lowtag sb!vm:list-pointer-type)
-             (eql lowtag sb!vm:other-pointer-type))
+      (if (or (eql lowtag sb!vm:fun-pointer-lowtag)
+             (eql lowtag sb!vm:instance-pointer-lowtag)
+             (eql lowtag sb!vm:list-pointer-lowtag)
+             (eql lowtag sb!vm:other-pointer-lowtag))
        (dolist (gspace (list *dynamic* *static* *read-only*)
                        (error "couldn't find a GSPACE for ~S" des))
-         ;; This code relies on the fact that GSPACEs are aligned such that
-         ;; the descriptor-low-bits low bits are zero.
+         ;; This code relies on the fact that GSPACEs are aligned
+         ;; such that the descriptor-low-bits low bits are zero.
          (when (and (>= high (ash (gspace-word-address gspace)
                                   (- sb!vm:word-shift descriptor-low-bits)))
                     (<= high (ash (+ (gspace-word-address gspace)
 (defun make-random-descriptor (value)
   (make-descriptor (logand (ash value (- descriptor-low-bits))
                           (1- (ash 1
-                                   (- sb!vm:word-bits descriptor-low-bits))))
+                                   (- sb!vm:n-word-bits
+                                      descriptor-low-bits))))
                   (logand value (1- (ash 1 descriptor-low-bits)))))
 
 (defun make-fixnum-descriptor (num)
   (when (>= (integer-length num)
-           (1+ (- sb!vm:word-bits sb!vm:lowtag-bits)))
+           (1+ (- sb!vm:n-word-bits sb!vm:n-lowtag-bits)))
     (error "~D is too big for a fixnum." num))
-  (make-random-descriptor (ash num (1- sb!vm:lowtag-bits))))
+  (make-random-descriptor (ash num (1- sb!vm:n-lowtag-bits))))
 
 (defun make-other-immediate-descriptor (data type)
-  (make-descriptor (ash data (- sb!vm:type-bits descriptor-low-bits))
+  (make-descriptor (ash data (- sb!vm:n-widetag-bits descriptor-low-bits))
                   (logior (logand (ash data (- descriptor-low-bits
-                                               sb!vm:type-bits))
+                                               sb!vm:n-widetag-bits))
                                   (1- (ash 1 descriptor-low-bits)))
                           type)))
 
 (defun make-character-descriptor (data)
-  (make-other-immediate-descriptor data sb!vm:base-char-type))
+  (make-other-immediate-descriptor data sb!vm:base-char-widetag))
 
 (defun descriptor-beyond (des offset type)
   (let* ((low (logior (+ (logandc2 (descriptor-low des) sb!vm:lowtag-mask)
 
 ;;; a handle on the trap object
 (defvar *unbound-marker*)
-;; was:  (make-other-immediate-descriptor 0 sb!vm:unbound-marker-type)
+;; was:  (make-other-immediate-descriptor 0 sb!vm:unbound-marker-widetag)
 
 ;;; a handle on the NIL object
 (defvar *nil-descriptor*)
 
 (defun maybe-byte-swap (word)
   (declare (type (unsigned-byte 32) word))
-  (aver (= sb!vm:word-bits 32))
-  (aver (= sb!vm:byte-bits 8))
+  (aver (= sb!vm:n-word-bits 32))
+  (aver (= sb!vm:n-byte-bits 8))
   (if (not *genesis-byte-order-swap-p*)
       word
       (logior (ash (ldb (byte 8 0) word) 24)
 
 (defun maybe-byte-swap-short (short)
   (declare (type (unsigned-byte 16) short))
-  (aver (= sb!vm:word-bits 32))
-  (aver (= sb!vm:byte-bits 8))
+  (aver (= sb!vm:n-word-bits 32))
+  (aver (= sb!vm:n-byte-bits 8))
   (if (not *genesis-byte-order-swap-p*)
       short
       (logior (ash (ldb (byte 8 0) short) 8)
                             (ldb (byte 8 ,(* i 8)) new-value)))))
               `(progn
                  (defun ,name (byte-vector byte-index)
-  (aver (= sb!vm:word-bits 32))
-  (aver (= sb!vm:byte-bits 8))
+  (aver (= sb!vm:n-word-bits 32))
+  (aver (= sb!vm:n-byte-bits 8))
   (ecase sb!c:*backend-byte-order*
     (:little-endian
                       (logior ,@ash-list))
     (:big-endian
      (error "stub: no big-endian ports of SBCL (yet?)"))))
                  (defun (setf ,name) (new-value byte-vector byte-index)
-  (aver (= sb!vm:word-bits 32))
-  (aver (= sb!vm:byte-bits 8))
+  (aver (= sb!vm:n-word-bits 32))
+  (aver (= sb!vm:n-byte-bits 8))
   (ecase sb!c:*backend-byte-order*
     (:little-endian
                       (setf ,@setf-list))
   "Allocate LENGTH units of ELEMENT-BITS bits plus a header word in GSPACE and
   return an ``other-pointer'' descriptor to them. Initialize the header word
   with the resultant length and TYPE."
-  (let* ((bytes (/ (* element-bits length) sb!vm:byte-bits))
+  (let* ((bytes (/ (* element-bits length) sb!vm:n-byte-bits))
         (des (allocate-cold-descriptor gspace
-                                       (+ bytes sb!vm:word-bytes)
-                                       sb!vm:other-pointer-type)))
+                                       (+ bytes sb!vm:n-word-bytes)
+                                       sb!vm:other-pointer-lowtag)))
     (write-memory des
                  (make-other-immediate-descriptor (ash bytes
                                                        (- sb!vm:word-shift))
   header word with TYPE and the length slot with LENGTH."
   ;; FIXME: Here and in ALLOCATE-UNBOXED-OBJECT, BYTES is calculated using
   ;; #'/ instead of #'CEILING, which seems wrong.
-  (let* ((bytes (/ (* element-bits length) sb!vm:byte-bits))
+  (let* ((bytes (/ (* element-bits length) sb!vm:n-byte-bits))
         (des (allocate-cold-descriptor gspace
-                                       (+ bytes (* 2 sb!vm:word-bytes))
-                                       sb!vm:other-pointer-type)))
+                                       (+ bytes (* 2 sb!vm:n-word-bytes))
+                                       sb!vm:other-pointer-lowtag)))
     (write-memory des (make-other-immediate-descriptor 0 type))
     (write-wordindexed des
                       sb!vm:vector-length-slot
   ;; extra null byte at the end to aid in call-out to C.)
   (let* ((length (length string))
         (des (allocate-vector-object gspace
-                                     sb!vm:byte-bits
+                                     sb!vm:n-byte-bits
                                      (1+ length)
-                                     sb!vm:simple-string-type))
+                                     sb!vm:simple-string-widetag))
         (bytes (gspace-bytes gspace))
-        (offset (+ (* sb!vm:vector-data-offset sb!vm:word-bytes)
+        (offset (+ (* sb!vm:vector-data-offset sb!vm:n-word-bytes)
                    (descriptor-byte-offset des))))
     (write-wordindexed des
                       sb!vm:vector-length-slot
 (defun bignum-to-core (n)
   #!+sb-doc
   "Copy a bignum to the cold core."
-  (let* ((words (ceiling (1+ (integer-length n)) sb!vm:word-bits))
+  (let* ((words (ceiling (1+ (integer-length n)) sb!vm:n-word-bits))
         (handle (allocate-unboxed-object *dynamic*
-                                         sb!vm:word-bits
+                                         sb!vm:n-word-bits
                                          words
-                                         sb!vm:bignum-type)))
+                                         sb!vm:bignum-widetag)))
     (declare (fixnum words))
     (do ((index 1 (1+ index))
-        (remainder n (ash remainder (- sb!vm:word-bits))))
+        (remainder n (ash remainder (- sb!vm:n-word-bits))))
        ((> index words)
         (unless (zerop (integer-length remainder))
           ;; FIXME: Shouldn't this be a fatal error?
           (warn "~D words of ~D were written, but ~D bits were left over."
                 words n remainder)))
-      (let ((word (ldb (byte sb!vm:word-bits 0) remainder)))
+      (let ((word (ldb (byte sb!vm:n-word-bits 0) remainder)))
        (write-wordindexed handle index
                           (make-descriptor (ash word (- descriptor-low-bits))
                                            (ldb (byte descriptor-low-bits 0)
 (defun number-pair-to-core (first second type)
   #!+sb-doc
   "Makes a number pair of TYPE (ratio or complex) and fills it in."
-  (let ((des (allocate-unboxed-object *dynamic* sb!vm:word-bits 2 type)))
+  (let ((des (allocate-unboxed-object *dynamic* sb!vm:n-word-bits 2 type)))
     (write-wordindexed des 1 first)
     (write-wordindexed des 2 second)
     des))
   (etypecase x
     (single-float
      (let ((des (allocate-unboxed-object *dynamic*
-                                        sb!vm:word-bits
+                                        sb!vm:n-word-bits
                                         (1- sb!vm:single-float-size)
-                                        sb!vm:single-float-type)))
+                                        sb!vm:single-float-widetag)))
        (write-wordindexed des
                          sb!vm:single-float-value-slot
                          (make-random-descriptor (single-float-bits x)))
        des))
     (double-float
      (let ((des (allocate-unboxed-object *dynamic*
-                                        sb!vm:word-bits
+                                        sb!vm:n-word-bits
                                         (1- sb!vm:double-float-size)
-                                        sb!vm:double-float-type))
+                                        sb!vm:double-float-widetag))
           (high-bits (make-random-descriptor (double-float-high-bits x)))
           (low-bits (make-random-descriptor (double-float-low-bits x))))
        (ecase sb!c:*backend-byte-order*
     #!+(and long-float x86)
     (long-float
      (let ((des (allocate-unboxed-object *dynamic*
-                                        sb!vm:word-bits
+                                        sb!vm:n-word-bits
                                         (1- sb!vm:long-float-size)
-                                        sb!vm:long-float-type))
+                                        sb!vm:long-float-widetag))
           (exp-bits (make-random-descriptor (long-float-exp-bits x)))
           (high-bits (make-random-descriptor (long-float-high-bits x)))
           (low-bits (make-random-descriptor (long-float-low-bits x))))
 
 (defun complex-single-float-to-core (num)
   (declare (type (complex single-float) num))
-  (let ((des (allocate-unboxed-object *dynamic* sb!vm:word-bits
+  (let ((des (allocate-unboxed-object *dynamic* sb!vm:n-word-bits
                                      (1- sb!vm:complex-single-float-size)
-                                     sb!vm:complex-single-float-type)))
+                                     sb!vm:complex-single-float-widetag)))
     (write-wordindexed des sb!vm:complex-single-float-real-slot
                   (make-random-descriptor (single-float-bits (realpart num))))
     (write-wordindexed des sb!vm:complex-single-float-imag-slot
 
 (defun complex-double-float-to-core (num)
   (declare (type (complex double-float) num))
-  (let ((des (allocate-unboxed-object *dynamic* sb!vm:word-bits
+  (let ((des (allocate-unboxed-object *dynamic* sb!vm:n-word-bits
                                      (1- sb!vm:complex-double-float-size)
-                                     sb!vm:complex-double-float-type)))
+                                     sb!vm:complex-double-float-widetag)))
     (let* ((real (realpart num))
           (high-bits (make-random-descriptor (double-float-high-bits real)))
           (low-bits (make-random-descriptor (double-float-low-bits real))))
                 (bignum-to-core number)))
     (ratio (number-pair-to-core (number-to-core (numerator number))
                                (number-to-core (denominator number))
-                               sb!vm:ratio-type))
+                               sb!vm:ratio-widetag))
     ((complex single-float) (complex-single-float-to-core number))
     ((complex double-float) (complex-double-float-to-core number))
     #!+long-float
      (error "~S isn't a cold-loadable number at all!" number))
     (complex (number-pair-to-core (number-to-core (realpart number))
                                  (number-to-core (imagpart number))
-                                 sb!vm:complex-type))
+                                 sb!vm:complex-widetag))
     (float (float-to-core number))
     (t (error "~S isn't a cold-loadable number at all!" number))))
 
 (declaim (ftype (function (sb!vm:word) descriptor) sap-to-core))
 (defun sapint-to-core (sapint)
   (let ((des (allocate-unboxed-object *dynamic*
-                                     sb!vm:word-bits
+                                     sb!vm:n-word-bits
                                      (1- sb!vm:sap-size)
-                                     sb!vm:sap-type)))
+                                     sb!vm:sap-widetag)))
     (write-wordindexed des
                       sb!vm:sap-pointer-slot
                       (make-random-descriptor sapint))
 
 ;;; Allocate a cons cell in GSPACE and fill it in with CAR and CDR.
 (defun cold-cons (car cdr &optional (gspace *dynamic*))
-  (let ((dest (allocate-boxed-object gspace 2 sb!vm:list-pointer-type)))
+  (let ((dest (allocate-boxed-object gspace 2 sb!vm:list-pointer-lowtag)))
     (write-memory dest car)
     (write-wordindexed dest 1 cdr)
     dest))
 ;;; descriptor.
 (defun vector-in-core (&rest objects)
   (let* ((size (length objects))
-        (result (allocate-vector-object *dynamic* sb!vm:word-bits size
-                                        sb!vm:simple-vector-type)))
+        (result (allocate-vector-object *dynamic* sb!vm:n-word-bits size
+                                        sb!vm:simple-vector-widetag)))
     (dotimes (index size)
       (write-wordindexed result (+ index sb!vm:vector-data-offset)
                         (pop objects)))
   (declare (simple-string name))
   (let ((symbol (allocate-unboxed-object (or *cold-symbol-allocation-gspace*
                                             *dynamic*)
-                                        sb!vm:word-bits
+                                        sb!vm:n-word-bits
                                         (1- sb!vm:symbol-size)
-                                        sb!vm:symbol-header-type)))
+                                        sb!vm:symbol-header-widetag)))
     (write-wordindexed symbol sb!vm:symbol-value-slot *unbound-marker*)
     #!+x86
     (write-wordindexed symbol
   (let ((result (allocate-boxed-object *dynamic*
                                       ;; KLUDGE: Why 1+? -- WHN 19990901
                                       (1+ target-layout-length)
-                                      sb!vm:instance-pointer-type)))
+                                      sb!vm:instance-pointer-lowtag)))
     (write-memory result
-                 (make-other-immediate-descriptor target-layout-length
-                                                  sb!vm:instance-header-type))
+                 (make-other-immediate-descriptor
+                  target-layout-length sb!vm:instance-header-widetag))
 
     ;; KLUDGE: The offsets into LAYOUT below should probably be pulled out
     ;; of the cross-compiler's tables at genesis time instead of inserted
 (defun make-nil-descriptor ()
   (let* ((des (allocate-unboxed-object
               *static*
-              sb!vm:word-bits
+              sb!vm:n-word-bits
               sb!vm:symbol-size
               0))
         (result (make-descriptor (descriptor-high des)
                                  (+ (descriptor-low des)
-                                    (* 2 sb!vm:word-bytes)
-                                    (- sb!vm:list-pointer-type
-                                       sb!vm:other-pointer-type)))))
+                                    (* 2 sb!vm:n-word-bytes)
+                                    (- sb!vm:list-pointer-lowtag
+                                       sb!vm:other-pointer-lowtag)))))
     (write-wordindexed des
                       1
                       (make-other-immediate-descriptor
                        0
-                       sb!vm:symbol-header-type))
+                       sb!vm:symbol-header-widetag))
     (write-wordindexed des
                       (+ 1 sb!vm:symbol-value-slot)
                       result)
   
 ;;; like CL:CAR, CL:CDR, and CL:NULL but for cold values
 (defun cold-car (des)
-  (aver (= (descriptor-lowtag des) sb!vm:list-pointer-type))
+  (aver (= (descriptor-lowtag des) sb!vm:list-pointer-lowtag))
   (read-wordindexed des sb!vm:cons-car-slot))
 (defun cold-cdr (des)
-  (aver (= (descriptor-lowtag des) sb!vm:list-pointer-type))
+  (aver (= (descriptor-lowtag des) sb!vm:list-pointer-lowtag))
   (read-wordindexed des sb!vm:cons-cdr-slot))
 (defun cold-null (des)
   (= (descriptor-bits des)
 (defun warm-fun-name (des)
   (let ((result
         (ecase (descriptor-lowtag des)
-          (#.sb!vm:list-pointer-type
+          (#.sb!vm:list-pointer-lowtag
            (aver (not (cold-null des))) ; function named NIL? please no..
            ;; Do cold (DESTRUCTURING-BIND (COLD-CAR COLD-CADR) DES ..).
            (let* ((car-des (cold-car des))
              (aver (cold-null cddr-des))
              (list (warm-symbol car-des)
                    (warm-symbol cadr-des))))
-          (#.sb!vm:other-pointer-type
+          (#.sb!vm:other-pointer-lowtag
            (warm-symbol des)))))
-    (unless (legal-function-name-p result)
+    (unless (legal-fun-name-p result)
       (error "not a legal function name: ~S" result))
     result))
 
     (or (gethash warm-name *cold-fdefn-objects*)
        (let ((fdefn (allocate-boxed-object (or *cold-fdefn-gspace* *dynamic*)
                                            (1- sb!vm:fdefn-size)
-                                           sb!vm:other-pointer-type)))
+                                           sb!vm:other-pointer-lowtag)))
 
          (setf (gethash warm-name *cold-fdefn-objects*) fdefn)
          (write-memory fdefn (make-other-immediate-descriptor
-                              (1- sb!vm:fdefn-size) sb!vm:fdefn-type))
+                              (1- sb!vm:fdefn-size) sb!vm:fdefn-widetag))
          (write-wordindexed fdefn sb!vm:fdefn-name-slot cold-name)
          (unless leave-fn-raw
-           (write-wordindexed fdefn sb!vm:fdefn-function-slot
+           (write-wordindexed fdefn sb!vm:fdefn-fun-slot
                               *nil-descriptor*)
            (write-wordindexed fdefn
                               sb!vm:fdefn-raw-addr-slot
 (defun static-fset (cold-name defn)
   (declare (type descriptor cold-name))
   (let ((fdefn (cold-fdefinition-object cold-name t))
-       (type (logand (descriptor-low (read-memory defn)) sb!vm:type-mask)))
-    (write-wordindexed fdefn sb!vm:fdefn-function-slot defn)
+       (type (logand (descriptor-low (read-memory defn)) sb!vm:widetag-mask)))
+    (write-wordindexed fdefn sb!vm:fdefn-fun-slot defn)
     (write-wordindexed fdefn
                       sb!vm:fdefn-raw-addr-slot
                       (ecase type
-                        (#.sb!vm:function-header-type
+                        (#.sb!vm:simple-fun-header-widetag
                          #!+sparc
                          defn
                          #!-sparc
                          (make-random-descriptor
                           (+ (logandc2 (descriptor-bits defn)
                                        sb!vm:lowtag-mask)
-                             (ash sb!vm:function-code-offset
+                             (ash sb!vm:simple-fun-code-offset
                                   sb!vm:word-shift))))
-                        (#.sb!vm:closure-header-type
+                        (#.sb!vm:closure-header-widetag
                          (make-random-descriptor
                           (cold-foreign-symbol-address-as-integer "closure_tramp")))))
     fdefn))
 
 (defun initialize-static-fns ()
   (let ((*cold-fdefn-gspace* *static*))
-    (dolist (sym sb!vm:*static-functions*)
+    (dolist (sym sb!vm:*static-funs*)
       (let* ((fdefn (cold-fdefinition-object (cold-intern sym)))
             (offset (- (+ (- (descriptor-low fdefn)
-                             sb!vm:other-pointer-type)
-                          (* sb!vm:fdefn-raw-addr-slot sb!vm:word-bytes))
+                             sb!vm:other-pointer-lowtag)
+                          (* sb!vm:fdefn-raw-addr-slot sb!vm:n-word-bytes))
                        (descriptor-low *nil-descriptor*)))
-            (desired (sb!vm:static-function-offset sym)))
+            (desired (sb!vm:static-fun-offset sym)))
        (unless (= offset desired)
          ;; FIXME: should be fatal
          (warn "Offset from FDEFN ~S to ~S is ~D, not ~D."
 (declaim (ftype (function (descriptor sb!vm:word)) calc-offset))
 (defun calc-offset (code-object offset-from-tail-of-header)
   (let* ((header (read-memory code-object))
-        (header-n-words (ash (descriptor-bits header) (- sb!vm:type-bits)))
+        (header-n-words (ash (descriptor-bits header)
+                             (- sb!vm:n-widetag-bits)))
         (header-n-bytes (ash header-n-words sb!vm:word-shift))
         (result (+ offset-from-tail-of-header header-n-bytes)))
     result))
            (let ((fixed-up (- (+ value un-fixed-up)
                               gspace-byte-address
                               gspace-byte-offset
-                              sb!vm:word-bytes))) ; length of CALL argument
+                              sb!vm:n-word-bytes))) ; length of CALL argument
              (setf (byte-vector-ref-32 gspace-bytes gspace-byte-offset)
                    fixed-up)
              ;; Note relative fixups that point outside the code
   (let* ((size (clone-arg))
         (result (allocate-boxed-object *dynamic*
                                        (1+ size)
-                                       sb!vm:instance-pointer-type)))
+                                       sb!vm:instance-pointer-lowtag)))
     (write-memory result (make-other-immediate-descriptor
-                         size
-                         sb!vm:instance-header-type))
+                         size sb!vm:instance-header-widetag))
     (do ((index (1- size) (1- index)))
        ((minusp index))
       (declare (fixnum index))
                (fop-small-vector)
   (let* ((size (clone-arg))
         (result (allocate-vector-object *dynamic*
-                                        sb!vm:word-bits
+                                        sb!vm:n-word-bits
                                         size
-                                        sb!vm:simple-vector-type)))
+                                        sb!vm:simple-vector-widetag)))
     (do ((index (1- size) (1- index)))
        ((minusp index))
       (declare (fixnum index))
   (let* ((len (read-arg 4))
         (sizebits (read-arg 1))
         (type (case sizebits
-                (1 sb!vm:simple-bit-vector-type)
-                (2 sb!vm:simple-array-unsigned-byte-2-type)
-                (4 sb!vm:simple-array-unsigned-byte-4-type)
-                (8 sb!vm:simple-array-unsigned-byte-8-type)
-                (16 sb!vm:simple-array-unsigned-byte-16-type)
-                (32 sb!vm:simple-array-unsigned-byte-32-type)
+                (1 sb!vm:simple-bit-vector-widetag)
+                (2 sb!vm:simple-array-unsigned-byte-2-widetag)
+                (4 sb!vm:simple-array-unsigned-byte-4-widetag)
+                (8 sb!vm:simple-array-unsigned-byte-8-widetag)
+                (16 sb!vm:simple-array-unsigned-byte-16-widetag)
+                (32 sb!vm:simple-array-unsigned-byte-32-widetag)
                 (t (error "losing element size: ~D" sizebits))))
         (result (allocate-vector-object *dynamic* sizebits len type))
         (start (+ (descriptor-byte-offset result)
                   (ash sb!vm:vector-data-offset sb!vm:word-shift)))
         (end (+ start
                 (ceiling (* len sizebits)
-                         sb!vm:byte-bits))))
+                         sb!vm:n-byte-bits))))
     (read-sequence-or-die (descriptor-bytes result)
                          *fasl-input-stream*
                          :start start
 
 (define-cold-fop (fop-single-float-vector)
   (let* ((len (read-arg 4))
-        (result (allocate-vector-object *dynamic*
-                                        sb!vm:word-bits
-                                        len
-                                        sb!vm:simple-array-single-float-type))
+        (result (allocate-vector-object
+                 *dynamic*
+                 sb!vm:n-word-bits
+                 len
+                 sb!vm:simple-array-single-float-widetag))
         (start (+ (descriptor-byte-offset result)
                   (ash sb!vm:vector-data-offset sb!vm:word-shift)))
-        (end (+ start (* len sb!vm:word-bytes))))
+        (end (+ start (* len sb!vm:n-word-bytes))))
     (read-sequence-or-die (descriptor-bytes result)
                          *fasl-input-stream*
                          :start start
         (data-vector (pop-stack))
         (result (allocate-boxed-object *dynamic*
                                        (+ sb!vm:array-dimensions-offset rank)
-                                       sb!vm:other-pointer-type)))
+                                       sb!vm:other-pointer-lowtag)))
     (write-memory result
                  (make-other-immediate-descriptor rank
-                                                  sb!vm:simple-array-type))
+                                                  sb!vm:simple-array-widetag))
     (write-wordindexed result sb!vm:array-fill-pointer-slot *nil-descriptor*)
     (write-wordindexed result sb!vm:array-data-slot data-vector)
     (write-wordindexed result sb!vm:array-displacement-slot *nil-descriptor*)
     (let ((total-elements 1))
       (dotimes (axis rank)
        (let ((dim (pop-stack)))
-         (unless (or (= (descriptor-lowtag dim) sb!vm:even-fixnum-type)
-                     (= (descriptor-lowtag dim) sb!vm:odd-fixnum-type))
+         (unless (or (= (descriptor-lowtag dim) sb!vm:even-fixnum-lowtag)
+                     (= (descriptor-lowtag dim) sb!vm:odd-fixnum-lowtag))
            (error "non-fixnum dimension? (~S)" dim))
          (setf total-elements
                (* total-elements
                   (logior (ash (descriptor-high dim)
-                               (- descriptor-low-bits (1- sb!vm:lowtag-bits)))
+                               (- descriptor-low-bits
+                                  (1- sb!vm:n-lowtag-bits)))
                           (ash (descriptor-low dim)
-                               (- 1 sb!vm:lowtag-bits)))))
+                               (- 1 sb!vm:n-lowtag-bits)))))
          (write-wordindexed result
                             (+ sb!vm:array-dimensions-offset axis)
                             dim)))
   (ecase +backend-fasl-file-implementation+
     (:x86 ; (which has 80-bit long-float format)
      (prepare-for-fast-read-byte *fasl-input-stream*
-       (let* ((des (allocate-unboxed-object *dynamic* sb!vm:word-bits
+       (let* ((des (allocate-unboxed-object *dynamic* sb!vm:n-word-bits
                                            (1- sb!vm:long-float-size)
-                                           sb!vm:long-float-type))
+                                           sb!vm:long-float-widetag))
              (low-bits (make-random-descriptor (fast-read-u-integer 4)))
              (high-bits (make-random-descriptor (fast-read-u-integer 4)))
              (exp-bits (make-random-descriptor (fast-read-s-integer 2))))
     #+nil
     (#.sb!c:sparc-fasl-file-implementation ; 128 bit long-float format
      (prepare-for-fast-read-byte *fasl-input-stream*
-       (let* ((des (allocate-unboxed-object *dynamic* sb!vm:word-bits
+       (let* ((des (allocate-unboxed-object *dynamic* sb!vm:n-word-bits
                                            (1- sb!vm:long-float-size)
-                                           sb!vm:long-float-type))
+                                           sb!vm:long-float-widetag))
              (low-bits (make-random-descriptor (fast-read-u-integer 4)))
              (mid-bits (make-random-descriptor (fast-read-u-integer 4)))
              (high-bits (make-random-descriptor (fast-read-u-integer 4)))
   (ecase +backend-fasl-file-implementation+
     (:x86 ; (which has 80-bit long-float format)
      (prepare-for-fast-read-byte *fasl-input-stream*
-       (let* ((des (allocate-unboxed-object *dynamic* sb!vm:word-bits
+       (let* ((des (allocate-unboxed-object *dynamic* sb!vm:n-word-bits
                                            (1- sb!vm:complex-long-float-size)
-                                           sb!vm:complex-long-float-type))
+                                           sb!vm:complex-long-float-widetag))
              (real-low-bits (make-random-descriptor (fast-read-u-integer 4)))
              (real-high-bits (make-random-descriptor (fast-read-u-integer 4)))
              (real-exp-bits (make-random-descriptor (fast-read-s-integer 2)))
     #+nil
     (#.sb!c:sparc-fasl-file-implementation ; 128 bit long-float format
      (prepare-for-fast-read-byte *fasl-input-stream*
-       (let* ((des (allocate-unboxed-object *dynamic* sb!vm:word-bits
+       (let* ((des (allocate-unboxed-object *dynamic* sb!vm:n-word-bits
                                            (1- sb!vm:complex-long-float-size)
-                                           sb!vm:complex-long-float-type))
+                                           sb!vm:complex-long-float-widetag))
              (real-low-bits (make-random-descriptor (fast-read-u-integer 4)))
              (real-mid-bits (make-random-descriptor (fast-read-u-integer 4)))
              (real-high-bits (make-random-descriptor (fast-read-u-integer 4)))
 
 (define-cold-fop (fop-ratio)
   (let ((den (pop-stack)))
-    (number-pair-to-core (pop-stack) den sb!vm:ratio-type)))
+    (number-pair-to-core (pop-stack) den sb!vm:ratio-widetag)))
 
 (define-cold-fop (fop-complex)
   (let ((im (pop-stack)))
-    (number-pair-to-core (pop-stack) im sb!vm:complex-type)))
+    (number-pair-to-core (pop-stack) im sb!vm:complex-widetag)))
 \f
 ;;;; cold fops for calling (or not calling)
 
 (defun finalize-load-time-value-noise ()
   (cold-set (cold-intern '*!load-time-values*)
            (allocate-vector-object *dynamic*
-                                   sb!vm:word-bits
+                                   sb!vm:n-word-bits
                                    *load-time-value-counter*
-                                   sb!vm:simple-vector-type)))
+                                   sb!vm:simple-vector-widetag)))
 
 (define-cold-fop (fop-funcall-for-effect nil)
   (if (= (read-arg 1) 0)
     (write-wordindexed obj
                   (+ idx
                      (ecase (descriptor-lowtag obj)
-                       (#.sb!vm:instance-pointer-type 1)
-                       (#.sb!vm:other-pointer-type 2)))
+                       (#.sb!vm:instance-pointer-lowtag 1)
+                       (#.sb!vm:other-pointer-lowtag 2)))
                   (pop-stack))))
 
 (define-cold-fop (fop-structset nil)
                                           (+ (ash header-n-words
                                                   sb!vm:word-shift)
                                              code-size)
-                                          sb!vm:other-pointer-type)))
+                                          sb!vm:other-pointer-lowtag)))
        (write-memory des
-                    (make-other-immediate-descriptor header-n-words
-                                                     sb!vm:code-header-type))
+                    (make-other-immediate-descriptor
+                     header-n-words sb!vm:code-header-widetag))
        (write-wordindexed des
                          sb!vm:code-code-size-slot
                          (make-fixnum-descriptor
                   "~&/raw code from code-fop ~D ~D:~%"
                   nconst
                   code-size)
-          (do ((i start (+ i sb!vm:word-bytes)))
+          (do ((i start (+ i sb!vm:n-word-bytes)))
               ((>= i end))
             (format *trace-output*
                     "/#X~8,'0x: #X~8,'0x~%"
         (offset (calc-offset code-object (read-arg 4)))
         (fn (descriptor-beyond code-object
                                offset
-                               sb!vm:function-pointer-type))
+                               sb!vm:fun-pointer-lowtag))
         (next (read-wordindexed code-object sb!vm:code-entry-points-slot)))
     (unless (zerop (logand offset sb!vm:lowtag-mask))
       ;; FIXME: This should probably become a fatal error.
       (warn "unaligned function entry: ~S at #X~X" name offset))
     (write-wordindexed code-object sb!vm:code-entry-points-slot fn)
     (write-memory fn
-                 (make-other-immediate-descriptor (ash offset
-                                                       (- sb!vm:word-shift))
-                                                  sb!vm:function-header-type))
+                 (make-other-immediate-descriptor
+                  (ash offset (- sb!vm:word-shift))
+                  sb!vm:simple-fun-header-widetag))
     (write-wordindexed fn
-                      sb!vm:function-self-slot
+                      sb!vm:simple-fun-self-slot
                       ;; KLUDGE: Wiring decisions like this in at
                       ;; this level ("if it's an x86") instead of a
                       ;; higher level of abstraction ("if it has such
                       ;; -- WHN 19990907
                       (make-random-descriptor
                        (+ (descriptor-bits fn)
-                          (- (ash sb!vm:function-code-offset sb!vm:word-shift)
+                          (- (ash sb!vm:simple-fun-code-offset
+                                  sb!vm:word-shift)
                              ;; FIXME: We should mask out the type
                              ;; bits, not assume we know what they
                              ;; are and subtract them out this way.
-                             sb!vm:function-pointer-type))))
-    (write-wordindexed fn sb!vm:function-next-slot next)
-    (write-wordindexed fn sb!vm:function-name-slot name)
-    (write-wordindexed fn sb!vm:function-arglist-slot arglist)
-    (write-wordindexed fn sb!vm:function-type-slot type)
+                             sb!vm:fun-pointer-lowtag))))
+    (write-wordindexed fn sb!vm:simple-fun-next-slot next)
+    (write-wordindexed fn sb!vm:simple-fun-name-slot name)
+    (write-wordindexed fn sb!vm:simple-fun-arglist-slot arglist)
+    (write-wordindexed fn sb!vm:simple-fun-type-slot type)
     fn))
 
 (define-cold-fop (fop-foreign-fixup)
                                        (+ (ash header-n-words
                                                sb!vm:word-shift)
                                           length)
-                                       sb!vm:other-pointer-type)))
+                                       sb!vm:other-pointer-lowtag)))
     (write-memory des
-                 (make-other-immediate-descriptor header-n-words
-                                                  sb!vm:code-header-type))
+                 (make-other-immediate-descriptor
+                  header-n-words sb!vm:code-header-widetag))
     (write-wordindexed des
                       sb!vm:code-code-size-slot
                       (make-fixnum-descriptor
 \f
 ;;;; emitting C header file
 
-(defun tail-comp (string tail)
+(defun tailwise-equal (string tail)
   (and (>= (length string) (length tail))
        (string= string tail :start1 (- (length string) (length tail)))))
 
-(defun head-comp (string head)
-  (and (>= (length string) (length head))
-       (string= string head :end1 (length head))))
-
 (defun write-c-header ()
 
   ;; writing beginning boilerplate
                                 (symbol-value symbol)
                                 (documentation symbol 'variable))
                           constants))
-                  ;; machinery for old-style CMU CL Lisp-to-C naming
+                  ;; machinery for old-style CMU CL Lisp-to-C
+                  ;; arbitrary renaming, being phased out in favor of
+                  ;; the newer systematic RECORD-WITH-TRANSLATED-NAME
+                  ;; renaming
                   (record-with-munged-name (prefix string priority)
                     (record (concatenate
                              'simple-string
                              prefix
                              (delete #\- (string-capitalize string)))
                             priority))
-                  (test-tail (tail prefix priority)
-                    (when (tail-comp name tail)
+                  (maybe-record-with-munged-name (tail prefix priority)
+                    (when (tailwise-equal name tail)
                       (record-with-munged-name prefix
                                                (subseq name 0
                                                        (- (length name)
                                                           (length tail)))
                                                priority)))
-                  (test-head (head prefix priority)
-                    (when (head-comp name head)
-                      (record-with-munged-name prefix
-                                               (subseq name (length head))
-                                               priority)))
                   ;; machinery for new-style SBCL Lisp-to-C naming
                   (record-with-translated-name (priority)
                     (record (substitute #\_ #\- name)
-                            priority)))
-           ;; This style of munging of names is used in the code
-           ;; inherited from CMU CL.
-           (test-tail "-TYPE" "type_" 0)
-           (test-tail "-FLAG" "flag_" 1)
-           (test-tail "-TRAP" "trap_" 2)
-           (test-tail "-SUBTYPE" "subtype_" 3)
-           (test-head "TRACE-TABLE-" "tracetab_" 4)
-           (test-tail "-SC-NUMBER" "sc_" 5)
-           ;; This simpler style of translation of names seems less
-           ;; confusing, and is used for newer code.
-           (when (some (lambda (suffix) (tail-comp name suffix))
-                       #("-START" "-END"))
-             (record-with-translated-name 6))))))
+                            priority))
+                  (maybe-record-with-translated-name (suffixes priority)
+                     (when (some (lambda (suffix)
+                                  (tailwise-equal name suffix))
+                                suffixes)
+                      (record-with-translated-name priority))))
+
+           (maybe-record-with-translated-name '("-LOWTAG") 0)
+           (maybe-record-with-translated-name '("-WIDETAG") 1)
+           (maybe-record-with-munged-name "-FLAG" "flag_" 2)
+           (maybe-record-with-munged-name "-TRAP" "trap_" 3)
+           (maybe-record-with-munged-name "-SUBTYPE" "subtype_" 4)
+           (maybe-record-with-munged-name "-SC-NUMBER" "sc_" 5)
+           (maybe-record-with-translated-name '("-START" "-END") 6)))))
     (setf constants
          (sort constants
                #'(lambda (const1 const2)
              "struct ~A {~%"
              (nsubstitute #\_ #\-
              (string-downcase (string (sb!vm:primitive-object-name obj)))))
-      (when (sb!vm:primitive-object-header obj)
+      (when (sb!vm:primitive-object-widetag obj)
        (format t "    lispobj header;~%"))
       (dolist (slot (sb!vm:primitive-object-slots obj))
        (format t "    ~A ~A~@[[1]~];~%"
          (format t "#define ~A_~A_OFFSET ~D~%"
                  (substitute #\_ #\- (string name))
                  (substitute #\_ #\- (string (sb!vm:slot-name slot)))
-                 (- (* (sb!vm:slot-offset slot) sb!vm:word-bytes) lowtag)))
+                 (- (* (sb!vm:slot-offset slot) sb!vm:n-word-bytes) lowtag)))
        (terpri))))
     (format t "#endif /* LANGUAGE_ASSEMBLY */~2%"))
 
              (descriptor-bits (cold-intern symbol))
              ;; We didn't run GENESIS, so guess at the address.
              (+ sb!vm:static-space-start
-                sb!vm:word-bytes
-                sb!vm:other-pointer-type
+                sb!vm:n-word-bytes
+                sb!vm:other-pointer-lowtag
                 (if symbol (sb!vm:static-symbol-offset symbol) 0)))))
 
   ;; Voila.
          (undefs nil))
       (maphash #'(lambda (name fdefn)
                   (let ((fun (read-wordindexed fdefn
-                                               sb!vm:fdefn-function-slot)))
+                                               sb!vm:fdefn-fun-slot)))
                     (if (= (descriptor-bits fun)
                            (descriptor-bits *nil-descriptor*))
                         (push name undefs)
@@ -2707,19 +2705,9 @@ that they were called before the out-of-line definition is installed,
 as is fairly common for structure accessors.)
 initially undefined function references:~2%")
 
-      (setf undefs (sort undefs #'string< :key #'function-name-block-name))
+      (setf undefs (sort undefs #'string< :key #'fun-name-block-name))
       (dolist (name undefs)
-        (format t "~S" name)
-       ;; FIXME: This ACCESSOR-FOR stuff should go away when the
-       ;; code has stabilized. (It's only here to help me
-       ;; categorize the flood of undefined functions caused by
-       ;; completely rewriting the bootstrap process. Hopefully any
-       ;; future maintainers will mostly have small numbers of
-       ;; undefined functions..)
-       (let ((accessor-for (info :function :accessor-for name)))
-         (when accessor-for
-           (format t " (accessor for ~S)" accessor-for)))
-       (format t "~%")))
+        (format t "~S~%" name)))
 
     (format t "~%~|~%layout names:~2%")
     (collect ((stuff))
@@ -2768,7 +2756,7 @@ initially undefined function references:~2%")
 (defun output-gspace (gspace)
   (force-output *core-file*)
   (let* ((posn (file-position *core-file*))
-        (bytes (* (gspace-free-word-index gspace) sb!vm:word-bytes))
+        (bytes (* (gspace-free-word-index gspace) sb!vm:n-word-bytes))
         (pages (ceiling bytes sb!c:*backend-page-size*))
         (total-bytes (* pages sb!c:*backend-page-size*)))
 
@@ -2850,7 +2838,7 @@ initially undefined function references:~2%")
       (let* ((cold-name (cold-intern '!cold-init))
             (cold-fdefn (cold-fdefinition-object cold-name))
             (initial-function (read-wordindexed cold-fdefn
-                                                sb!vm:fdefn-function-slot)))
+                                                sb!vm:fdefn-fun-slot)))
        (format t
                "~&/(DESCRIPTOR-BITS INITIAL-FUNCTION)=#X~X~%"
                (descriptor-bits initial-function))
@@ -2963,7 +2951,7 @@ initially undefined function references:~2%")
           (*current-reversed-cold-toplevels* *nil-descriptor*)
           (*unbound-marker* (make-other-immediate-descriptor
                              0
-                             sb!vm:unbound-marker-type))
+                             sb!vm:unbound-marker-widetag))
           *cold-assembler-fixups*
           *cold-assembler-routines*
           #!+x86 *load-time-code-fixups*)
@@ -3043,15 +3031,15 @@ initially undefined function references:~2%")
       (cold-set 'sb!vm:*read-only-space-free-pointer*
                (allocate-cold-descriptor *read-only*
                                          0
-                                         sb!vm:even-fixnum-type))
+                                         sb!vm:even-fixnum-lowtag))
       (cold-set 'sb!vm:*static-space-free-pointer*
                (allocate-cold-descriptor *static*
                                          0
-                                         sb!vm:even-fixnum-type))
+                                         sb!vm:even-fixnum-lowtag))
       (cold-set 'sb!vm:*initial-dynamic-space-free-pointer*
                (allocate-cold-descriptor *dynamic*
                                          0
-                                         sb!vm:even-fixnum-type))
+                                         sb!vm:even-fixnum-lowtag))
       (/show "done setting free pointers")
 
       ;; Write results to files.