1 ;;;; implementation-independent facilities used for defining the
2 ;;;; compiler's interface to the VM in a given implementation
4 ;;;; This software is part of the SBCL system. See the README file for
7 ;;;; This software is derived from the CMU CL system, which was
8 ;;;; written at Carnegie Mellon University and released into the
9 ;;;; public domain. The software is in the public domain and is
10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
11 ;;;; files for more information.
15 ;;; Return the template having the specified name, or die trying.
16 (defun template-or-lose (x)
18 (or (gethash x *backend-template-names*)
19 (error "~S is not a defined template." x))))
21 ;;; Return the SC structure, SB structure or SC number corresponding
22 ;;; to a name, or die trying.
25 (or (gethash x *backend-sc-names*)
26 (error "~S is not a defined storage class." x))))
29 (or (gethash x *backend-sb-names*)
30 (error "~S is not a defined storage base." x))))
31 (defun sc-number-or-lose (x)
32 (the sc-number (sc-number (sc-or-lose x))))
34 ;;; This is like the non-meta versions, except we go for the
35 ;;; meta-compile-time info. These should not be used after load time,
36 ;;; since compiling the compiler changes the definitions.
37 (defun meta-sc-or-lose (x)
39 (or (gethash x *backend-meta-sc-names*)
40 (error "~S is not a defined storage class." x))))
41 (defun meta-sb-or-lose (x)
43 (or (gethash x *backend-meta-sb-names*)
44 (error "~S is not a defined storage base." x))))
45 (defun meta-sc-number-or-lose (x)
46 (the sc-number (sc-number (meta-sc-or-lose x))))
48 ;;;; side effect classes
50 (!def-boolean-attribute vop
53 ;;;; move/coerce definition
55 ;;; Compute at compiler load time the costs for moving between all SCs that
56 ;;; can be loaded from FROM-SC and to TO-SC given a base move cost Cost.
57 (defun compute-move-costs (from-sc to-sc cost)
58 (declare (type sc from-sc to-sc) (type index cost))
59 (let ((to-scn (sc-number to-sc))
60 (from-costs (sc-load-costs from-sc)))
61 (dolist (dest-sc (cons to-sc (sc-alternate-scs to-sc)))
62 (let ((vec (sc-move-costs dest-sc))
63 (dest-costs (sc-load-costs dest-sc)))
64 (setf (svref vec (sc-number from-sc)) cost)
65 (dolist (sc (append (sc-alternate-scs from-sc)
66 (sc-constant-scs from-sc)))
67 (let* ((scn (sc-number sc))
68 (total (+ (svref from-costs scn)
69 (svref dest-costs to-scn)
71 (old (svref vec scn)))
72 (unless (and old (< old total))
73 (setf (svref vec scn) total))))))))
75 ;;;; primitive type definition
77 ;;; Return the primitive type corresponding to the specified name, or
79 (defun primitive-type-or-lose (name)
81 (or (gethash name *backend-primitive-type-names*)
82 (error "~S is not a defined primitive type." name))))
84 ;;; Return true if SC is either one of PTYPE's SC's, or one of those
85 ;;; SC's alternate or constant SCs.
86 (defun sc-allowed-by-primitive-type (sc ptype)
87 (declare (type sc sc) (type primitive-type ptype))
88 (let ((scn (sc-number sc)))
89 (dolist (allowed (primitive-type-scs ptype) nil)
90 (when (eql allowed scn)
92 (let ((allowed-sc (svref *backend-sc-numbers* allowed)))
93 (when (or (member sc (sc-alternate-scs allowed-sc))
94 (member sc (sc-constant-scs allowed-sc)))
97 ;;;; generation of emit functions
99 (eval-when (:compile-toplevel :load-toplevel :execute)
100 ;; We need the EVAL-WHEN because %EMIT-GENERIC-VOP (below)
101 ;; uses #.MAX-VOP-TN-REFS, not just MAX-VOP-TN-REFS.
104 ;; See also the description of VOP-INFO-TARGETS. -- APD, 2002-01-30
105 (def!constant max-vop-tn-refs 256))
107 ;;; FIXME: This is a remarkably eccentric way of implementing what
108 ;;; would appear to be by nature a closure. A closure isn't any more
109 ;;; threadsafe than this special variable implementation, but at least
110 ;;; it's more idiomatic, and one could imagine closing over an
111 ;;; extensible pool to make a thread-safe implementation.
112 (declaim (type (simple-vector #.max-vop-tn-refs) *vop-tn-refs*))
113 (defvar *vop-tn-refs* (make-array max-vop-tn-refs :initial-element nil))
115 (def!constant sc-bits (integer-length (1- sc-number-limit)))
117 (defun emit-generic-vop (node block template args results &optional info)
118 (%emit-generic-vop node block template args results info))
120 (defun %emit-generic-vop (node block template args results info)
121 (let* ((vop (make-vop block node template args results))
122 (num-args (vop-info-num-args template))
123 (last-arg (1- num-args))
124 (num-results (vop-info-num-results template))
125 (num-operands (+ num-args num-results))
126 (last-result (1- num-operands))
127 (ref-ordering (vop-info-ref-ordering template)))
128 (declare (type vop vop)
129 (type (integer 0 #.max-vop-tn-refs)
130 num-args num-results num-operands)
131 (type (integer -1 #.(1- max-vop-tn-refs)) last-arg last-result))
132 (setf (vop-codegen-info vop) info)
134 (let ((refs *vop-tn-refs*))
135 (declare (type (simple-vector #.max-vop-tn-refs) refs))
136 (do ((index 0 (1+ index))
137 (ref args (and ref (tn-ref-across ref))))
139 (setf (svref refs index) ref))
140 (do ((index num-args (1+ index))
141 (ref results (and ref (tn-ref-across ref))))
142 ((= index num-operands))
143 (setf (svref refs index) ref))
144 (let ((temps (vop-info-temps template)))
146 (let ((index num-operands)
148 (dotimes (i (length temps))
149 (let* ((temp (aref temps i))
150 (tn (if (logbitp 0 temp)
152 (ldb (byte sc-bits 1) temp)
153 (ash temp (- (1+ sc-bits))))
154 (make-restricted-tn nil (ash temp -1))))
155 (write-ref (reference-tn tn t)))
156 ;; KLUDGE: These formulas must be consistent with
157 ;; those in COMPUTE-REF-ORDERING, and this is
158 ;; currently maintained by hand. -- WHN
159 ;; 2002-01-30, paraphrasing APD
160 (setf (aref refs index) (reference-tn tn nil))
161 (setf (aref refs (1+ index)) write-ref)
163 (setf (tn-ref-across prev) write-ref)
164 (setf (vop-temps vop) write-ref))
165 (setf prev write-ref)
168 (flet ((add-ref (ref)
169 (setf (tn-ref-vop ref) vop)
170 (setf (tn-ref-next-ref ref) prev)
172 (declare (inline add-ref))
173 (dotimes (i (length ref-ordering))
174 (let* ((index (aref ref-ordering i))
175 (ref (aref refs index)))
176 (if (or (= index last-arg) (= index last-result))
177 (do ((ref ref (tn-ref-across ref)))
181 (setf (vop-refs vop) prev))
182 (let ((targets (vop-info-targets template)))
184 (dotimes (i (length targets))
185 (let ((target (aref targets i)))
187 (aref refs (ldb (byte 8 8) target))
188 (aref refs (ldb (byte 8 0) target)))))))
190 (fill *vop-tn-refs* nil))))
192 ;;;; function translation stuff
194 ;;; Add Template into List, removing any old template with the same name.
195 ;;; We also maintain the increasing cost ordering.
196 (defun adjoin-template (template list)
197 (declare (type template template) (list list))
199 (remove (template-name template) list
200 :key #'template-name))
202 :key #'template-cost))
204 ;;; Return a function type specifier describing TEMPLATE's type computed
205 ;;; from the operand type restrictions.
206 (defun template-type-specifier (template)
207 (declare (type template template))
208 (flet ((convert (types more-types)
213 (:or `(or ,@(mapcar #'primitive-type-specifier
215 (:constant `(constant-arg ,(third x)))))))
216 `(,@(mapcar #'frob types)
218 `(&rest ,(frob more-types)))))))
219 (let* ((args (convert (template-arg-types template)
220 (template-more-args-type template)))
221 (result-restr (template-result-types template))
222 (results (if (template-conditional-p template)
224 (convert result-restr
225 (cond ((template-more-results-type template))
226 ((/= (length result-restr) 1) '*)
229 ,(if (= (length results) 1)
231 `(values ,@results))))))
233 #!-sb-fluid (declaim (inline template-conditional-p))
234 (defun template-conditional-p (template)
235 (declare (type template template))
236 (let ((rtypes (template-result-types template)))
237 (or (eq rtypes :conditional)
238 (eq (car rtypes) :conditional))))