module/language/cps/reify-primitives.scm

   1 ;;; Continuation-passing style (CPS) intermediate language (IL)
   2
   3 ;; Copyright (C) 2013 Free Software Foundation, Inc.
   4
   5 ;;;; This library is free software; you can redistribute it and/or
   6 ;;;; modify it under the terms of the GNU Lesser General Public
   7 ;;;; License as published by the Free Software Foundation; either
   8 ;;;; version 3 of the License, or (at your option) any later version.
   9 ;;;;
  10 ;;;; This library is distributed in the hope that it will be useful,
  11 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 ;;;; Lesser General Public License for more details.
  14 ;;;;
  15 ;;;; You should have received a copy of the GNU Lesser General Public
  16 ;;;; License along with this library; if not, write to the Free Software
  17 ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18
  19 ;;; Commentary:
  20 ;;;
  21 ;;; A pass to reify lone $prim's that were never folded into a
  22 ;;; $primcall, and $primcall's to primitives that don't have a
  23 ;;; corresponding VM op.
  24 ;;;
  25 ;;; Code:
  26
  27 (define-module (language cps reify-primitives)
  28   #:use-module (ice-9 match)
  29   #:use-module (language cps)
  30   #:use-module (language cps dfg)
  31   #:use-module (language cps primitives)
  32   #:use-module (language rtl)
  33   #:export (reify-primitives))
  34
  35 (define (module-box src module name public? bound? val-proc)
  36   (let-gensyms (module-sym name-sym public?-sym bound?-sym kbox box)
  37     (build-cps-term
  38       ($letconst (('module module-sym module)
  39                   ('name name-sym name)
  40                   ('public? public?-sym public?)
  41                   ('bound? bound?-sym bound?))
  42         ($letk ((kbox src ($kargs ('box) (box) ,(val-proc box))))
  43           ($continue kbox
  44             ($primcall 'cached-module-box
  45                        (module-sym name-sym public?-sym bound?-sym))))))))
  46
  47 (define (primitive-module name)
  48   (case name
  49     ((bytevector-u8-ref bytevector-u8-set!
  50       bytevector-s8-ref bytevector-s8-set!
  51
  52       bytevector-u16-ref bytevector-u16-set!
  53       bytevector-u16-native-ref bytevector-u16-native-set!
  54       bytevector-s16-ref bytevector-s16-set!
  55       bytevector-s16-native-ref bytevector-s16-native-set!
  56
  57       bytevector-u32-ref bytevector-u32-set!
  58       bytevector-u32-native-ref bytevector-u32-native-set!
  59       bytevector-s32-ref bytevector-s32-set!
  60       bytevector-s32-native-ref bytevector-s32-native-set!
  61
  62       bytevector-u64-ref bytevector-u64-set!
  63       bytevector-u64-native-ref bytevector-u64-native-set!
  64       bytevector-s64-ref bytevector-s64-set!
  65       bytevector-s64-native-ref bytevector-s64-native-set!
  66
  67       bytevector-ieee-single-ref bytevector-ieee-single-set!
  68       bytevector-ieee-single-native-ref bytevector-ieee-single-native-set!
  69       bytevector-ieee-double-ref bytevector-ieee-double-set!
  70       bytevector-ieee-double-native-ref bytevector-ieee-double-native-set!)
  71      '(rnrs bytevectors))
  72     ((class-of @slot-ref @slot-set!) '(oop goops))
  73     (else '(guile))))
  74
  75 (define (primitive-ref name k)
  76   (module-box #f (primitive-module name) name #f #t
  77               (lambda (box)
  78                 (build-cps-term
  79                   ($continue k ($primcall 'box-ref (box)))))))
  80
  81 (define (builtin-ref idx k)
  82   (let-gensyms (idx-sym)
  83     (build-cps-term
  84       ($letconst (('idx idx-sym idx))
  85         ($continue k
  86           ($primcall 'builtin-ref (idx-sym)))))))
  87
  88 (define (reify-clause ktail)
  89   (let-gensyms (kclause kbody wna false str eol kthrow throw)
  90     (build-cps-cont
  91       (kclause #f ($kclause ('() '() #f '() #f)
  92                    (kbody
  93                     #f
  94                     ($kargs () ()
  95                       ($letconst (('wna wna 'wrong-number-of-args)
  96                                   ('false false #f)
  97                                   ('str str "Wrong number of arguments")
  98                                   ('eol eol '()))
  99                         ($letk ((kthrow
 100                                  #f
 101                                  ($kargs ('throw) (throw)
 102                                    ($continue ktail
 103                                      ($call throw
 104                                             (wna false str eol false))))))
 105                           ,(primitive-ref 'throw kthrow))))))))))
 106
 107 ;; FIXME: Operate on one function at a time, for efficiency.
 108 (define (reify-primitives fun)
 109   (let ((conts (build-cont-table fun)))
 110     (define (visit-fun term)
 111       (rewrite-cps-exp term
 112         (($ $fun meta free body)
 113          ($fun meta free ,(visit-cont body)))))
 114     (define (visit-cont cont)
 115       (rewrite-cps-cont cont
 116         (($ $cont sym src ($ $kargs names syms body))
 117          (sym src ($kargs names syms ,(visit-term body))))
 118         (($ $cont sym src ($ $kentry self (and tail ($ $cont ktail)) ()))
 119          ;; A case-lambda with no clauses.  Reify a clause.
 120          (sym src ($kentry self ,tail (,(reify-clause ktail)))))
 121         (($ $cont sym src ($ $kentry self tail clauses))
 122          (sym src ($kentry self ,tail ,(map visit-cont clauses))))
 123         (($ $cont sym src ($ $kclause arity body))
 124          (sym src ($kclause ,arity ,(visit-cont body))))
 125         (($ $cont)
 126          ,cont)))
 127     (define (visit-term term)
 128       (rewrite-cps-term term
 129         (($ $letk conts body)
 130          ($letk ,(map visit-cont conts) ,(visit-term body)))
 131         (($ $continue k exp)
 132          ,(match exp
 133             (($ $prim name)
 134              (match (lookup-cont k conts)
 135                (($ $kargs (_))
 136                 (cond
 137                  ((builtin-name->index name)
 138                   => (lambda (idx)
 139                        (builtin-ref idx k)))
 140                  (else (primitive-ref name k))))
 141                (_ (build-cps-term ($continue k ($void))))))
 142             (($ $fun)
 143              (build-cps-term ($continue k ,(visit-fun exp))))
 144             (($ $primcall 'call-thunk/no-inline (proc))
 145              (build-cps-term
 146                ($continue k ($call proc ()))))
 147             (($ $primcall name args)
 148              (cond
 149               ((or (prim-rtl-instruction name) (branching-primitive? name))
 150                ;; Assume arities are correct.
 151                term)
 152               (else
 153                (let-gensyms (k* v)
 154                  (build-cps-term
 155                    ($letk ((k* #f ($kargs (v) (v)
 156                                     ($continue k ($call v args)))))
 157                      ,(cond
 158                        ((builtin-name->index name)
 159                         => (lambda (idx)
 160                              (builtin-ref idx k*)))
 161                        (else (primitive-ref name k*)))))))))
 162             (_ term)))))
 163
 164     (visit-fun fun)))