1 ;;;; this file centralizes information about the array types
2 ;;;; implemented by the system, where previously such information was
3 ;;;; spread over several files.
5 ;;;; This software is part of the SBCL system. See the README file for
8 ;;;; This software is derived from the CMU CL system, which was
9 ;;;; written at Carnegie Mellon University and released into the
10 ;;;; public domain. The software is in the public domain and is
11 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
12 ;;;; files for more information.
16 (defstruct (specialized-array-element-type-properties
21 initial-element-default
24 &key (n-pad-elements 0) complex-typecode (importance 0)
26 (eval (symbolicate primitive-type-name "-WIDETAG")))))
28 ;; the element specifier, e.g. BASE-CHAR or (UNSIGNED-BYTE 4)
29 (specifier (missing-arg) :type type-specifier :read-only t)
30 ;; the element type, e.g. #<BUILT-IN-CLASS BASE-CHAR (sealed)> or
31 ;; #<SB-KERNEL:NUMERIC-TYPE (UNSIGNED-BYTE 4)>
32 (ctype nil :type (or ctype null))
33 ;; what we get when the low-level vector-creation logic zeroes all
34 ;; the bits (which also serves as the default value of MAKE-ARRAY's
35 ;; :INITIAL-ELEMENT keyword)
36 (initial-element-default (missing-arg) :read-only t)
37 ;; how many bits per element
38 (n-bits (missing-arg) :type index :read-only t)
39 ;; the low-level type code (aka "widetag")
40 (typecode (missing-arg) :type index :read-only t)
41 ;; if an integer, a typecode corresponding to a complex vector
42 ;; specialized on this element type.
43 (complex-typecode nil :type (or index null) :read-only t)
44 ;; the name of the primitive type of data vectors specialized on
46 (primitive-type-name (missing-arg) :type symbol :read-only t)
47 ;; the number of extra elements we use at the end of the array for
48 ;; low level hackery (e.g., one element for arrays of BASE-CHAR,
49 ;; which is used for a fixed #\NULL so that when we call out to C
50 ;; we don't need to cons a new copy)
51 (n-pad-elements (missing-arg) :type index :read-only t)
52 ;; the relative importance of this array type. Used for determining
53 ;; the order of the TYPECASE in HAIRY-DATA-VECTOR-{REF,SET}. High
54 ;; positive numbers are near the top; low negative numbers near the
56 (importance (missing-arg) :type fixnum :read-only t))
58 (defparameter *specialized-array-element-type-properties*
61 (apply #'!make-saetp args))
62 `(;; Erm. Yeah. There aren't a lot of things that make sense
63 ;; for an initial element for (ARRAY NIL). -- CSR, 2002-03-07
64 (nil #:mu 0 simple-array-nil
65 :complex-typecode #.sb!vm:complex-vector-nil-widetag
67 (base-char ,(code-char 0) 8 simple-base-string
68 ;; (SIMPLE-BASE-STRINGs are stored with an extra
69 ;; trailing #\NULL for convenience in calling out
72 :complex-typecode #.sb!vm:complex-base-string-widetag
74 (single-float 0.0f0 32 simple-array-single-float
76 (double-float 0.0d0 64 simple-array-double-float
78 (bit 0 1 simple-bit-vector
79 :complex-typecode #.sb!vm:complex-bit-vector-widetag
81 ;; KLUDGE: The fact that these UNSIGNED-BYTE entries come
82 ;; before their SIGNED-BYTE partners is significant in the
83 ;; implementation of the compiler; some of the cross-compiler
84 ;; code (see e.g. COERCE-TO-SMALLEST-ELTYPE in
85 ;; src/compiler/debug-dump.lisp) attempts to create an array
86 ;; specialized on (UNSIGNED-BYTE FOO), where FOO could be 7;
87 ;; (UNSIGNED-BYTE 7) is SUBTYPEP (SIGNED-BYTE 8), so if we're
88 ;; not careful we could get the wrong specialized array when
89 ;; we try to FIND-IF, below. -- CSR, 2002-07-08
90 ((unsigned-byte 2) 0 2 simple-array-unsigned-byte-2
92 ((unsigned-byte 4) 0 4 simple-array-unsigned-byte-4
94 ((unsigned-byte 7) 0 8 simple-array-unsigned-byte-7
96 ((unsigned-byte 8) 0 8 simple-array-unsigned-byte-8
98 ((unsigned-byte 15) 0 16 simple-array-unsigned-byte-15
100 ((unsigned-byte 16) 0 16 simple-array-unsigned-byte-16
102 ((unsigned-byte 29) 0 32 simple-array-unsigned-byte-29
104 ((unsigned-byte 31) 0 32 simple-array-unsigned-byte-31
106 ((unsigned-byte 32) 0 32 simple-array-unsigned-byte-32
108 ((signed-byte 8) 0 8 simple-array-signed-byte-8
110 ((signed-byte 16) 0 16 simple-array-signed-byte-16
112 ;; KLUDGE: See the comment in PRIMITIVE-TYPE-AUX,
113 ;; compiler/generic/primtype.lisp, for why this is FIXNUM and
114 ;; not (SIGNED-BYTE 30)
115 (fixnum 0 32 simple-array-signed-byte-30
117 ((signed-byte 32) 0 32 simple-array-signed-byte-32
119 ((complex single-float) #C(0.0f0 0.0f0) 64
120 simple-array-complex-single-float
122 ((complex double-float) #C(0.0d0 0.0d0) 128
123 simple-array-complex-double-float
126 ((complex long-float) #C(0.0l0 0.0l0) #!+x86 192 #!+sparc 256
127 simple-array-complex-long-float
129 (t 0 32 simple-vector :importance 18))))
131 (defvar sb!kernel::*specialized-array-element-types*
134 *specialized-array-element-type-properties*))
137 (defun !vm-type-cold-init ()
138 (setf sb!kernel::*specialized-array-element-types*
139 '#.sb!kernel::*specialized-array-element-types*))
141 (defvar *simple-array-primitive-types*
144 (cons (saetp-specifier saetp)
145 (saetp-primitive-type-name saetp)))
146 *specialized-array-element-type-properties*)
148 "An alist for mapping simple array element types to their
149 corresponding primitive types.")