src/assembly/assemfile.lisp

   1 ;;;; the extra code necessary to feed an entire file of assembly code
   2 ;;;; to the assembler
   3
   4 ;;;; This software is part of the SBCL system. See the README file for
   5 ;;;; more information.
   6 ;;;;
   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.
  12
  13 (in-package "SB!C")
  14 \f
  15 ;;; If non-NIL, emit assembly code. If NIL, emit VOP templates.
  16 (defvar *emit-assembly-code-not-vops-p* nil)
  17
  18 ;;; a list of (NAME . LABEL) for every entry point
  19 (defvar *entry-points* nil)
  20
  21 ;;; Set this to NIL to inhibit assembly-level optimization. (For
  22 ;;; compiler debugging, rather than policy control.)
  23 (defvar *assembly-optimize* t)
  24
  25 ;;; Note: You might think from the name that this would act like
  26 ;;; COMPILE-FILE, but in fact it's arguably more like LOAD, even down
  27 ;;; to the return convention. It LOADs a file, then writes out any
  28 ;;; assembly code created by the process.
  29 (defun assemble-file (name
  30                       &key
  31                       (output-file (make-pathname :defaults name
  32                                                   :type "assem")))
  33   ;; FIXME: Consider nuking the filename defaulting logic here.
  34   (let* ((*emit-assembly-code-not-vops-p* t)
  35          (name (pathname name))
  36          ;; the fasl file currently being output to
  37          (lap-fasl-output (open-fasl-output (pathname output-file) name))
  38          (*entry-points* nil)
  39          (won nil)
  40          (*code-segment* nil)
  41          (*elsewhere* nil)
  42          (*assembly-optimize* nil)
  43          (*fixup-notes* nil))
  44     (unwind-protect
  45         (let ((*features* (cons :sb-assembling *features*)))
  46           (init-assembler)
  47           (load (merge-pathnames name (make-pathname :type "lisp")))
  48           (fasl-dump-cold-load-form `(in-package ,(package-name
  49                                                    (sane-package)))
  50                                     lap-fasl-output)
  51           (sb!assem:append-segment *code-segment* *elsewhere*)
  52           (setf *elsewhere* nil)
  53           (let ((length (sb!assem:finalize-segment *code-segment*)))
  54             (dump-assembler-routines *code-segment*
  55                                      length
  56                                      *fixup-notes*
  57                                      *entry-points*
  58                                      lap-fasl-output))
  59           (setq won t))
  60       (close-fasl-output lap-fasl-output (not won)))
  61     won))
  62
  63 (defstruct (reg-spec (:copier nil))
  64   (kind :temp :type (member :arg :temp :res))
  65   (name nil :type symbol)
  66   (temp nil :type symbol)
  67   (scs nil :type (or list symbol))
  68   (offset nil))
  69 (def!method print-object ((spec reg-spec) stream)
  70   (print-unreadable-object (spec stream :type t)
  71     (format stream
  72             ":KIND ~S :NAME ~S :SCS ~S :OFFSET ~S"
  73             (reg-spec-kind spec)
  74             (reg-spec-name spec)
  75             (reg-spec-scs spec)
  76             (reg-spec-offset spec))))
  77
  78 (defun reg-spec-sc (spec)
  79   (if (atom (reg-spec-scs spec))
  80       (reg-spec-scs spec)
  81       (car (reg-spec-scs spec))))
  82
  83 (defun parse-reg-spec (kind name sc offset)
  84   (let ((reg (make-reg-spec :kind kind :name name :scs sc :offset offset)))
  85     (ecase kind
  86       (:temp)
  87       ((:arg :res)
  88        (setf (reg-spec-temp reg) (make-symbol (symbol-name name)))))
  89     reg))
  90
  91 (defun emit-assemble (name options regs code)
  92   (collect ((decls))
  93     (loop
  94       (if (and (consp code) (consp (car code)) (eq (caar code) 'declare))
  95           (decls (pop code))
  96           (return)))
  97     `(let ,(mapcar (lambda (reg)
  98                      `(,(reg-spec-name reg)
  99                        (make-random-tn
 100                         :kind :normal
 101                         :sc (sc-or-lose ',(reg-spec-sc reg))
 102                         :offset ,(reg-spec-offset reg))))
 103                    regs)
 104        ,@(decls)
 105        (sb!assem:assemble (*code-segment* ',name)
 106          ,name
 107          (push (cons ',name ,name) *entry-points*)
 108          ,@code
 109          ,@(generate-return-sequence
 110             (or (cadr (assoc :return-style options)) :raw)))
 111        (when sb!xc:*compile-print*
 112          (format *error-output* "~S assembled~%" ',name)))))
 113
 114 (defun arg-or-res-spec (reg)
 115   `(,(reg-spec-name reg)
 116     :scs ,(if (atom (reg-spec-scs reg))
 117               (list (reg-spec-scs reg))
 118               (reg-spec-scs reg))
 119     ,@(unless (eq (reg-spec-kind reg) :res)
 120         `(:target ,(reg-spec-temp reg)))))
 121
 122 (defun emit-vop (name options vars)
 123   (let* ((args (remove :arg vars :key #'reg-spec-kind :test #'neq))
 124          (temps (remove :temp vars :key #'reg-spec-kind :test #'neq))
 125          (results (remove :res vars :key #'reg-spec-kind :test #'neq))
 126          (return-style (or (cadr (assoc :return-style options)) :raw))
 127          (cost (or (cadr (assoc :cost options)) 247))
 128          (vop (make-symbol "VOP")))
 129     (unless (member return-style '(:raw :full-call :none))
 130       (error "unknown return-style for ~S: ~S" name return-style))
 131     (multiple-value-bind
 132         (call-sequence call-temps)
 133         (generate-call-sequence name return-style vop)
 134       `(define-vop ,(if (atom name) (list name) name)
 135          (:args ,@(mapcar #'arg-or-res-spec args))
 136          ,@(let ((index -1))
 137              (mapcar (lambda (arg)
 138                        `(:temporary (:sc ,(reg-spec-sc arg)
 139                                      :offset ,(reg-spec-offset arg)
 140                                      :from (:argument ,(incf index))
 141                                      :to (:eval 2))
 142                                     ,(reg-spec-temp arg)))
 143                      args))
 144          ,@(mapcar (lambda (temp)
 145                      `(:temporary (:sc ,(reg-spec-sc temp)
 146                                    :offset ,(reg-spec-offset temp)
 147                                    :from (:eval 1)
 148                                    :to (:eval 3))
 149                                   ,(reg-spec-name temp)))
 150                    temps)
 151          ,@call-temps
 152          (:vop-var ,vop)
 153          ,@(let ((index -1))
 154              (mapcar (lambda (res)
 155                        `(:temporary (:sc ,(reg-spec-sc res)
 156                                      :offset ,(reg-spec-offset res)
 157                                      :from (:eval 2)
 158                                      :to (:result ,(incf index))
 159                                      :target ,(reg-spec-name res))
 160                                     ,(reg-spec-temp res)))
 161                      results))
 162          (:results ,@(mapcar #'arg-or-res-spec results))
 163          (:ignore ,@(mapcar #'reg-spec-name temps)
 164                   ,@(apply #'append
 165                            (mapcar #'cdr
 166                                    (remove :ignore call-temps
 167                                            :test #'neq :key #'car))))
 168          ,@(remove-if (lambda (x)
 169                         (member x '(:return-style :cost)))
 170                       options
 171                       :key #'car)
 172          (:generator ,cost
 173            ,@(mapcar (lambda (arg)
 174                        #!+(or hppa alpha) `(move ,(reg-spec-name arg)
 175                                                  ,(reg-spec-temp arg))
 176                        #!-(or hppa alpha) `(move ,(reg-spec-temp arg)
 177                                                  ,(reg-spec-name arg)))
 178                      args)
 179            ,@call-sequence
 180            ,@(mapcar (lambda (res)
 181                        #!+(or hppa alpha) `(move ,(reg-spec-temp res)
 182                                                  ,(reg-spec-name res))
 183                        #!-(or hppa alpha) `(move ,(reg-spec-name res)
 184                                                  ,(reg-spec-temp res)))
 185                      results))))))
 186
 187 (def!macro define-assembly-routine (name&options vars &body code)
 188   (multiple-value-bind (name options)
 189       (if (atom name&options)
 190           (values name&options nil)
 191           (values (car name&options)
 192                   (cdr name&options)))
 193     (let ((regs (mapcar (lambda (var) (apply #'parse-reg-spec var)) vars)))
 194       (if *emit-assembly-code-not-vops-p*
 195           (emit-assemble name options regs code)
 196           (emit-vop name options regs)))))