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New pass to avoid free variable creation for self-recursion
* module/language/cps/self-references.scm: New pass, avoids the need for self-recursion to allocate free variables. * module/Makefile.am: * module/language/cps/compile-bytecode.scm: Wire up the new pass.
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@ -133,6 +133,7 @@ CPS_LANG_SOURCES = \
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language/cps/prune-top-level-scopes.scm \
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language/cps/reify-primitives.scm \
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language/cps/renumber.scm \
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language/cps/self-references.scm \
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language/cps/slot-allocation.scm \
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language/cps/simplify.scm \
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language/cps/spec.scm \
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@ -40,6 +40,7 @@
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#:use-module (language cps prune-top-level-scopes)
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#:use-module (language cps reify-primitives)
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#:use-module (language cps renumber)
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#:use-module (language cps self-references)
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#:use-module (language cps simplify)
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#:use-module (language cps slot-allocation)
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#:use-module (language cps specialize-primcalls)
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@ -72,6 +73,7 @@
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(exp (run-pass exp elide-values #:elide-values? #t))
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(exp (run-pass exp prune-bailouts #:prune-bailouts? #t))
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(exp (run-pass exp eliminate-common-subexpressions #:cse? #t))
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(exp (run-pass exp resolve-self-references #:resolve-self-references? #t))
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(exp (run-pass exp eliminate-dead-code #:eliminate-dead-code? #t))
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(exp (run-pass exp simplify #:simplify? #t)))
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;; Passes that are needed:
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79
module/language/cps/self-references.scm
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79
module/language/cps/self-references.scm
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@ -0,0 +1,79 @@
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;;; 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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;;; A pass that prunes successors of expressions that bail out.
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;;;
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;;; Code:
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(define-module (language cps self-references)
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#:use-module (ice-9 match)
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#:use-module (language cps)
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#:export (resolve-self-references))
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(define* (resolve-self-references fun #:optional (env '()))
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(define (subst var)
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(or (assq-ref env var) var))
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(define (visit-cont cont)
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(rewrite-cps-cont cont
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(($ $cont label ($ $kargs names vars body))
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(label ($kargs names vars ,(visit-term body))))
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(($ $cont label ($ $kentry self tail clause))
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(label ($kentry self ,tail
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,(and clause (visit-cont clause)))))
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(($ $cont label ($ $kclause arity body alternate))
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(label ($kclause ,arity ,(visit-cont body)
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,(and alternate (visit-cont alternate)))))
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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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(($ $letrec names vars funs body)
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($letrec names vars (map visit-recursive-fun funs vars)
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,(visit-term body)))
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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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(($ $continue k src exp)
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($continue k src ,(visit-exp exp)))))
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(define (visit-exp exp)
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(rewrite-cps-exp exp
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((or ($ $void) ($ $const) ($ $prim)) ,exp)
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(($ $fun) ,(resolve-self-references exp env))
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(($ $call proc args)
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($call (subst proc) ,(map subst args)))
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(($ $callk k proc args)
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($callk k (subst proc) ,(map subst args)))
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(($ $primcall name args)
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($primcall name ,(map subst args)))
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(($ $values args)
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($values ,(map subst args)))
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(($ $prompt escape? tag handler)
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($prompt escape? (subst tag) handler))))
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(define (visit-recursive-fun fun var)
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(match fun
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(($ $fun src meta free (and cont ($ $cont _ ($ $kentry self))))
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(resolve-self-references fun (acons var self env)))))
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(rewrite-cps-exp fun
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(($ $fun src meta free cont)
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($fun src meta (map subst free) ,(visit-cont cont)))))
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