;;; 'def.*even-fixnum-lowtag' can find them.
;;; Tags for the main low-level types are stored in the low n (usually three)
-;;; bits to identify the type of a machine word. Certain constraints
+;;; bits to identify the type of a machine word. Certain constraints
;;; apply:
;;; * EVEN-FIXNUM-LOWTAG and ODD-FIXNUM-LOWTAG must be 0 and 4: code
;;; which shifts left two places to convert raw integers to tagged
;;; fixnums is ubiquitous.
-;;; * LIST-POINTER-LOWTAG + N-WORD-BYTES = OTHER-POINTER-LOWTAG: NIL
+;;; * LIST-POINTER-LOWTAG + N-WORD-BYTES = OTHER-POINTER-LOWTAG: NIL
;;; is both a cons and a symbol (at the same address) and depends on this.
;;; See the definition of SYMBOL in objdef.lisp
;;; * OTHER-POINTER-LOWTAG > 4: Some code in the SPARC backend,
;;; PSEUDO-ATOMIC is on, doesn't strip the low bits of reg_ALLOC
;;; before ORing in OTHER-POINTER-LOWTAG within a PSEUDO-ATOMIC
;;; section.
-;;; * OTHER-IMMEDIATE-0-LOWTAG are spaced 4 apart: various code wants to
+;;; * OTHER-IMMEDIATE-0-LOWTAG are spaced 4 apart: various code wants to
;;; iterate through these
+;;; * Allocation code on Alpha wants lowtags for heap-allocated
+;;; objects to be odd.
;;; (These are just the ones we know about as of sbcl-0.7.1.22. There
;;; might easily be more, since these values have stayed highly
;;; constrained for more than a decade, an inviting target for
;; The EVAL-WHEN is necessary (at least for Lispworks), because the
;; second DEFENUM uses the value of OTHER-IMMEDIATE-0-LOWTAG, which is
;; defined in the first DEFENUM. -- AL 20000216
- #!+x86-64
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
(defenum (:suffix -lowtag)
even-fixnum
instance-pointer
pad3 pad4 pad5
other-immediate-3
other-pointer)
- #!-x86-64
+ #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
(defenum (:suffix -lowtag)
even-fixnum
instance-pointer
;;; ANDcc tag, 0xA6, tag
;;; JNE tag, label
;;;
-;;; rather than two separate tests and jumps
+;;; rather than two separate tests and jumps
(defenum (:suffix -widetag
- :start (+ (ash 1 n-lowtag-bits) other-immediate-0-lowtag)
- :step 4)
+ ;; The first widetag must be greater than SB!VM:LOWTAG-LIMIT
+ ;; otherwise code in generic/early-type-vops will suffer
+ ;; a long, horrible death. --njf, 2004-08-09
+ :start (+ (ash 1 n-lowtag-bits) other-immediate-0-lowtag)
+ :step 4)
+ ;; NOTE: the binary numbers off to the side are only valid for 32-bit
+ ;; ports; add #b1000 if you want to know the values for 64-bit ports.
+ ;; And note that the numbers get a little scrambled further down.
+ ;; --njf, 2004-08-09
bignum ; 00001010
ratio ; 00001110
single-float ; 00010010
return-pc-header ; 00110110
value-cell-header ; 00111010
symbol-header ; 00111110
- base-char ; 01000010
+ character ; 01000010
sap ; 01000110
unbound-marker ; 01001010
weak-pointer ; 01001110
instance-header ; 01010010
fdefn ; 01010110
- unused00 ; 01011010
+ no-tls-value-marker ; 01011010
unused01 ; 01011110
unused02 ; 01100010
unused03 ; 01100110
unused05 ; 01101110
unused06 ; 01110010
unused07 ; 01110110
+ #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
unused08 ; 01111010
+ #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
unused09 ; 01111110
-
+
+ #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
unused10 ; 10000010
+ #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
unused11 ; 10000110
simple-array-unsigned-byte-2 ; 10001010
simple-array-unsigned-byte-16 ; 10011110
simple-array-nil ; 10100010
simple-base-string ; 10100110
+ #!+sb-unicode simple-character-string
simple-bit-vector ; 10101010
simple-vector ; 10101110
+ #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
simple-array-unsigned-byte-29 ; 10110010
simple-array-unsigned-byte-31 ; 10110110
simple-array-unsigned-byte-32 ; 10111010
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ simple-array-unsigned-byte-60
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ simple-array-unsigned-byte-63
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ simple-array-unsigned-byte-64
simple-array-signed-byte-8 ; 10111110
simple-array-signed-byte-16 ; 11000010
+ #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
simple-array-signed-byte-30 ; 11000110
simple-array-signed-byte-32 ; 11001010
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ simple-array-signed-byte-61
+ #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or))
+ simple-array-signed-byte-64
simple-array-single-float ; 11001110
simple-array-double-float ; 11010010
simple-array-complex-single-float ; 11010110
simple-array ; 11011110
complex-vector-nil ; 11100010
complex-base-string ; 11100110
+ #!+sb-unicode complex-character-string
complex-bit-vector ; 11101010
complex-vector ; 11101110
complex-array ; 11110010
+ #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
unused12 ; 11110110
+ #!+(and #.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
+ (not sb-unicode))
unused13 ; 11111010
+ #!+(and #.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or))
+ (not sb-unicode))
unused14 ; 11111110
)
projects / sbcl.git / blobdiff