X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcompiler%2Fgeneric%2Fearly-objdef.lisp;h=eb6927509bbb286d175cbaa4b3ef4e7c1c410c53;hb=7f579b076a1fc54587538ead07e506e7f06f3fe8;hp=c99e7a8ed2ebf4b0f6f70eaa42a2c3d865652d5e;hpb=7646aefa188758e2892fea2ad02be4f29b3938f2;p=sbcl.git diff --git a/src/compiler/generic/early-objdef.lisp b/src/compiler/generic/early-objdef.lisp index c99e7a8..eb69275 100644 --- a/src/compiler/generic/early-objdef.lisp +++ b/src/compiler/generic/early-objdef.lisp @@ -11,20 +11,13 @@ (in-package "SB!VM") -;;; FIXME: It's clever using :SUFFIX -TYPE for these things, but it's -;;; a pain for people just learning to find their way around the code -;;; who want to use lexical search to figure out where things like -;;; EVEN-FIXNUM-LOWTAG are defined. Remove the :SUFFIXes and just expand -;;; out the full names. Or even define them in DEF EVEN-FIXNUM-LOWTAG -;;; style so searches like '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, @@ -32,44 +25,83 @@ ;;; 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 ;;; inventive abstraction-phobic maintainers.:-) +;;; +;;; Another way to look at lowtags is that there is no one lowtag +;;; length. On 32-bit platforms, fixnums and other-immediates have a +;;; lowtag length of two bits, and pointers have a lowtag length of +;;; three bits. On 64-bit platforms, fixnums and pointers gain an +;;; extra bit, and six "pad" lowtags waste the extra encoding space so +;;; obtained. +;;; +;;; x00 -- fixnum +;;; x10 -- other-immediate +;;; 001 -- instance-pointer +;;; 011 -- list-pointer +;;; 101 -- fun-pointer +;;; 111 -- other-pointer +;;; +;;; If you change the tag layout, check the various functions in +;;; src/runtime/runtime.h to see if they need to be updated, along +;;; with print_obj() in src/runtime/print.c, possibly gc_init_tables() +;;; in src/runtime/gc-common-c and possibly the code in src/code/room. (eval-when (:compile-toplevel :load-toplevel :execute) ;; 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 - (defenum (:suffix -lowtag) - even-fixnum - instance-pointer - other-immediate-0 - pad0 pad1 pad2 - other-immediate-1 - list-pointer - odd-fixnum - fun-pointer - other-immediate-2 - pad3 pad4 pad5 - other-immediate-3 - other-pointer) - #!-x86-64 - (defenum (:suffix -lowtag) - even-fixnum - instance-pointer - other-immediate-0 - list-pointer - odd-fixnum - fun-pointer - other-immediate-1 - other-pointer)) + #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or)) + (defenum () + even-fixnum-lowtag + other-immediate-0-lowtag + pad0-lowtag + instance-pointer-lowtag + pad1-lowtag + other-immediate-1-lowtag + pad2-lowtag + list-pointer-lowtag + odd-fixnum-lowtag + other-immediate-2-lowtag + pad3-lowtag + fun-pointer-lowtag + pad4-lowtag + other-immediate-3-lowtag + pad5-lowtag + other-pointer-lowtag) + #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + (defenum () + even-fixnum-lowtag + instance-pointer-lowtag + other-immediate-0-lowtag + list-pointer-lowtag + odd-fixnum-lowtag + fun-pointer-lowtag + other-immediate-1-lowtag + other-pointer-lowtag)) (def!constant nil-value (+ static-space-start n-word-bytes other-pointer-lowtag)) +(defconstant-eqx fixnum-lowtags + #.(let ((fixtags nil)) + (do-external-symbols (sym "SB!VM") + (let* ((name (symbol-name sym)) + (len (length name))) + (when (and (boundp sym) + (integerp (symbol-value sym)) + (> len 7) + (string= name "-LOWTAG" :start1 (- len 7)) + (zerop (logand (symbol-value sym) fixnum-tag-mask))) + (push sym fixtags)))) + `',(sort fixtags #'string< :key #'symbol-name)) + #'equal) + ;;; the heap types, stored in 8 bits of the header of an object on the ;;; heap, to identify the type of the heap object (which'll be at ;;; least two machine words, often more) @@ -107,79 +139,115 @@ ;;; ANDcc tag, 0xA6, tag ;;; JNE tag, label ;;; -;;; rather than two separate tests and jumps -(defenum (:suffix -widetag - :start (+ (ash 1 n-lowtag-bits) other-immediate-0-lowtag) - :step 4) - bignum - ratio - single-float - double-float - complex - complex-single-float - complex-double-float +;;; rather than two separate tests and jumps +(defenum (;; 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-widetag ; 00001010 + ratio-widetag ; 00001110 + single-float-widetag ; 00010010 + double-float-widetag ; 00010110 + complex-widetag ; 00011010 + complex-single-float-widetag ; 00011110 + complex-double-float-widetag ; 00100010 + + code-header-widetag ; 00100110 + + simple-fun-header-widetag ; 00101010 + closure-header-widetag ; 00101110 + funcallable-instance-header-widetag ; 00110010 + + return-pc-header-widetag ; 00110110 + value-cell-header-widetag ; 00111010 + symbol-header-widetag ; 00111110 + character-widetag ; 01000010 + sap-widetag ; 01000110 + unbound-marker-widetag ; 01001010 + weak-pointer-widetag ; 01001110 + instance-header-widetag ; 01010010 + fdefn-widetag ; 01010110 - code-header - simple-fun-header - closure-header - funcallable-instance-header + no-tls-value-marker-widetag ; 01011010 + #!-sb-simd-pack + unused01-widetag + #!+sb-simd-pack + simd-pack-widetag ; 01011110 + unused02-widetag ; 01100010 + unused03-widetag ; 01100110 + unused04-widetag ; 01101010 + unused05-widetag ; 01101110 + unused06-widetag ; 01110010 + unused07-widetag ; 01110110 + #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + unused08-widetag ; 01111010 + #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + unused09-widetag ; 01111110 - return-pc-header - value-cell-header - symbol-header - base-char - sap - unbound-marker - weak-pointer - instance-header - fdefn + #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + unused10-widetag ; 10000010 + #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + unused11-widetag ; 10000110 - unused00 - unused01 - unused02 - unused03 - unused04 - unused05 - unused06 - unused07 - unused08 - unused09 - - unused10 - unused11 + simple-array-unsigned-byte-2-widetag ; 10001010 + simple-array-unsigned-byte-4-widetag ; 10001110 + simple-array-unsigned-byte-7-widetag ; 10010010 + simple-array-unsigned-byte-8-widetag ; 10010110 + simple-array-unsigned-byte-15-widetag ; 10011010 + simple-array-unsigned-byte-16-widetag ; 10011110 + simple-array-nil-widetag ; 10100010 + simple-base-string-widetag ; 10100110 + #!+sb-unicode simple-character-string-widetag + simple-bit-vector-widetag ; 10101010 + simple-vector-widetag ; 10101110 + #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + simple-array-unsigned-fixnum-widetag ; 10110010 + simple-array-unsigned-byte-31-widetag ; 10110110 + simple-array-unsigned-byte-32-widetag ; 10111010 + #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or)) + simple-array-unsigned-fixnum-widetag + #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or)) + simple-array-unsigned-byte-63-widetag + #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or)) + simple-array-unsigned-byte-64-widetag + simple-array-signed-byte-8-widetag ; 10111110 + simple-array-signed-byte-16-widetag ; 11000010 + #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + simple-array-fixnum-widetag ; 11000110 + simple-array-signed-byte-32-widetag ; 11001010 + #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or)) + simple-array-fixnum-widetag + #!+#.(cl:if (cl:= 64 sb!vm:n-word-bits) '(and) '(or)) + simple-array-signed-byte-64-widetag + simple-array-single-float-widetag ; 11001110 + simple-array-double-float-widetag ; 11010010 + simple-array-complex-single-float-widetag ; 11010110 + simple-array-complex-double-float-widetag ; 11011010 + simple-array-widetag ; 11011110 + complex-vector-nil-widetag ; 11100010 + complex-base-string-widetag ; 11100110 + #!+sb-unicode complex-character-string-widetag + complex-bit-vector-widetag ; 11101010 + complex-vector-widetag ; 11101110 + complex-array-widetag ; 11110010 - simple-array-unsigned-byte-2 - simple-array-unsigned-byte-4 - simple-array-unsigned-byte-7 - simple-array-unsigned-byte-8 - simple-array-unsigned-byte-15 - simple-array-unsigned-byte-16 - simple-array-nil - simple-base-string - simple-bit-vector - simple-vector - simple-array-unsigned-byte-29 - simple-array-unsigned-byte-31 - simple-array-unsigned-byte-32 - simple-array-signed-byte-8 - simple-array-signed-byte-16 - simple-array-signed-byte-30 - simple-array-signed-byte-32 - simple-array-single-float - simple-array-double-float - simple-array-complex-single-float - simple-array-complex-double-float - simple-array - complex-vector-nil - complex-base-string - complex-bit-vector - complex-vector - complex-array + #!+#.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + unused12-widetag ; 11110110 + #!+(and #.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + (not sb-unicode)) + unused13-widetag ; 11111010 + #!+(and #.(cl:if (cl:= 32 sb!vm:n-word-bits) '(and) '(or)) + (not sb-unicode)) + unused14-widetag ; 11111110 ) ;;; the different vector subtypes -(defenum (:prefix vector- :suffix -subtype) - normal - unused - valid-hashing - must-rehash) +(defenum () + vector-normal-subtype + vector-unused-subtype + vector-valid-hashing-subtype)