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828ed94469
* .dir-locals.el: Add with-fresh-name-state. * module/language/cps.scm (fresh-label, fresh-var): Signal an error if the counters are not initialized. (with-fresh-name-state): New macro. (make-cont-folder): New macro, generates an n-ary folder. (compute-max-label-and-var): New function, uses make-cont-folder. (fold-conts): Use make-cont-folder. (let-gensyms): Remove. * module/language/cps/arities.scm: * module/language/cps/closure-conversion.scm: * module/language/cps/constructors.scm: * module/language/cps/dce.scm: * module/language/cps/elide-values.scm: * module/language/cps/reify-primitives.scm: * module/language/cps/specialize-primcalls.scm: Use let-fresh instead of let-gensyms, and wrap in a with-fresh-name-state as needed. * module/language/tree-il/compile-cps.scm: Remove hack to avoid importing let-gensyms from (language tree-il).
102 lines
4 KiB
Scheme
102 lines
4 KiB
Scheme
;;; Continuation-passing style (CPS) intermediate language (IL)
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;; Copyright (C) 2013, 2014 Free Software Foundation, Inc.
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;; Commentary:
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;;;
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;;; Constructor inlining turns "list" primcalls into a series of conses,
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;;; and does similar transformations for "vector".
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;;;
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;;; Code:
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(define-module (language cps constructors)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-26)
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#:use-module (language cps)
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#:export (inline-constructors))
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(define (inline-constructors* fun)
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(define (visit-cont cont)
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(rewrite-cps-cont cont
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(($ $cont sym ($ $kargs names syms body))
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(sym ($kargs names syms ,(visit-term body))))
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(($ $cont sym ($ $kentry self tail clauses))
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(sym ($kentry self ,tail ,(map visit-cont clauses))))
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(($ $cont sym ($ $kclause arity body))
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(sym ($kclause ,arity ,(visit-cont body))))
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(($ $cont)
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,cont)))
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(define (visit-term term)
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(rewrite-cps-term term
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(($ $letk conts body)
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($letk ,(map visit-cont conts)
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,(visit-term body)))
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(($ $letrec names syms funs body)
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($letrec names syms (map inline-constructors* funs)
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,(visit-term body)))
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(($ $continue k src ($ $primcall 'list args))
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,(let-fresh (kvalues) (val)
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(build-cps-term
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($letk ((kvalues ($kargs ('val) (val)
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($continue k src
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($primcall 'values (val))))))
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,(let lp ((args args) (k kvalues))
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(match args
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(()
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(build-cps-term
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($continue k src ($const '()))))
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((arg . args)
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(let-fresh (ktail) (tail)
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(build-cps-term
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($letk ((ktail ($kargs ('tail) (tail)
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($continue k src
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($primcall 'cons (arg tail))))))
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,(lp args ktail)))))))))))
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(($ $continue k src ($ $primcall 'vector args))
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,(let-fresh (kalloc) (vec len init)
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(define (initialize args n)
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(match args
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(()
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(build-cps-term
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($continue k src ($primcall 'values (vec)))))
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((arg . args)
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(let-fresh (knext) (idx)
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(build-cps-term
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($letk ((knext ($kargs () ()
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,(initialize args (1+ n)))))
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($letconst (('idx idx n))
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($continue knext src
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($primcall 'vector-set! (vec idx arg))))))))))
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(build-cps-term
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($letk ((kalloc ($kargs ('vec) (vec)
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,(initialize args 0))))
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($letconst (('len len (length args))
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('init init #f))
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($continue kalloc src
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($primcall 'make-vector (len init))))))))
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(($ $continue k src (and fun ($ $fun)))
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($continue k src ,(inline-constructors* fun)))
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(($ $continue)
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,term)))
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(rewrite-cps-exp fun
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(($ $fun src meta free body)
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($fun src meta free ,(visit-cont body)))))
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(define (inline-constructors fun)
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(with-fresh-name-state fun
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(inline-constructors* fun)))
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