849 lines
35 KiB
Scheme
849 lines
35 KiB
Scheme
;;; Ikarus Scheme -- A compiler for R6RS Scheme.
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;;; Copyright (C) 2006,2007,2008 Abdulaziz Ghuloum
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;;;
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;;; This program is free software: you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License version 3 as
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;;; published by the Free Software Foundation.
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;;;
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;;; This program is distributed in the hope that it will be useful, but
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;;; 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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;;; General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Work in progress
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;;; Oscar Waddell. "Extending the Scope of Syntactic Abstraction". PhD.
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;;; Thesis. Indiana University Computer Science Department. August 1999.
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;;; Available online:
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;;; http://www.cs.indiana.edu/~owaddell/papers/thesis.ps.gz
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(module (source-optimize optimize-level cp0-effort-limit cp0-size-limit)
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(define who 'source-optimize)
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;;;
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(define-structure (app rand* ctxt)
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([inlined #f]))
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;;;
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(define-structure (operand expr env ec)
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([value #f]
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[residualize-for-effect #f]
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[size 0]
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[inner-pending #f]
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[outer-pending #f]))
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;;;
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(define-structure (counter value ctxt k))
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;;;
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(define (passive-counter)
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(make-counter (greatest-fixnum) #f
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(lambda args
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(error 'passive-counter "invalid abort"))))
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;;;
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(define (passive-counter-value x)
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(- (greatest-fixnum) (counter-value x)))
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;;;
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(define (active-counter? x)
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(and (counter? x) (counter-ctxt x)))
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;;;
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(define (decrement x amt)
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(let ([n (- (counter-value x) amt)])
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(set-counter-value! x n)
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(when (< n 0)
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(reset-integrated! (counter-ctxt x))
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((counter-k x) #f))))
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;;;
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(define (abort-counter! x)
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(reset-integrated! (counter-ctxt x))
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((counter-k x) #f))
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;;;
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(define (reset-integrated! ctxt)
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(set-app-inlined! ctxt #f)
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(let ([ctxt (app-ctxt ctxt)])
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(when (app? ctxt)
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(reset-integrated! ctxt))))
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;;;
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;;;
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(module (with-extended-env copy-var)
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(define (copy-var x)
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(let ([y (make-prelex (prelex-name x) #f)])
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(set-prelex-source-referenced?! y
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(prelex-source-referenced? x))
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(set-prelex-source-assigned?! y
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(prelex-source-assigned? x))
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(let ([loc (prelex-global-location x)])
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(when loc
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(set-prelex-global-location! y loc)
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(set-prelex-source-referenced?! y #t)
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(set-prelex-residual-referenced?! y #t)))
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y))
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(define (extend env lhs* rands)
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(if (null? lhs*)
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(values env '())
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(let ([nlhs* (map copy-var lhs*)])
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(when rands
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(for-each
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(lambda (lhs rhs)
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(set-prelex-operand! lhs rhs))
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nlhs* rands))
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(values (vector lhs* nlhs* env) nlhs*))))
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(define (copy-back ls)
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(for-each
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(lambda (x)
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(set-prelex-source-assigned?! x
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(prelex-residual-assigned? x))
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(set-prelex-source-referenced?! x
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(prelex-residual-referenced? x)))
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ls))
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(define-syntax with-extended-env
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(syntax-rules ()
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[(_ ((e2 args2) (e1 args1 rands)) b b* ...)
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(let-values ([(e2 args2) (extend e1 args1 rands)])
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(let ([v (let () b b* ...)])
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(copy-back args2)
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v))])))
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(define cp0-effort-limit (make-parameter 50))
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(define cp0-size-limit (make-parameter 8))
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(define primitive-info-list
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'(
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[(cons _ _) effect-free result-true]
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[(cons* _) foldable effect-free ]
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[(cons* _ . _) effect-free result-true]
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[(list) foldable effect-free result-true]
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[(list . _) effect-free result-true]
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[(reverse ()) foldable effect-free result-true]
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[(string) foldable effect-free result-true]
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[(string . _) result-true]
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[(make-string 0) foldable effect-free result-true]
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[(make-string 0 _) foldable effect-free result-true]
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[(make-string . _) result-true]
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[(make-bytevector 0) foldable effect-free result-true]
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[(make-bytevector 0 _) foldable result-true]
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[(make-bytevector . _) result-true]
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[(string-length _) foldable result-true]
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[(string-ref _ _) foldable result-true]
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[(vector) foldable effect-free result-true]
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[(vector . _) effect-free result-true]
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[(make-vector 0) foldable effect-free result-true]
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[(make-vector 0 _) foldable effect-free result-true]
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[(make-vector . _) result-true]
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[(vector-length _) foldable result-true]
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[(vector-ref _ _) foldable ]
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[(eq? _ _) foldable effect-free ]
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[(eqv? _ _) foldable effect-free ]
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[(assq _ _) foldable ]
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[(assv _ _) foldable ]
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[(assoc _ _) foldable ]
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[(not _) foldable effect-free ]
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[(null? _) foldable effect-free ]
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[(pair? _) foldable effect-free ]
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[(fixnum? _) foldable effect-free ]
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[(vector? _) foldable effect-free ]
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[(string? _) foldable effect-free ]
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[(char? _) foldable effect-free ]
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[(symbol? _) foldable effect-free ]
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[(procedure? _) foldable effect-free ]
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[(eof-object? _) foldable effect-free ]
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[(flonum? _) foldable effect-free ]
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[(cflonum? _) foldable effect-free ]
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[(compnum? _) foldable effect-free ]
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[(integer? _) foldable effect-free ]
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[(bignum? _) foldable effect-free ]
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[(ratnum? _) foldable effect-free ]
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[(void) foldable effect-free result-true]
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[(car _) foldable ]
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[(cdr _) foldable ]
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[(caar _) foldable ]
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[(cadr _) foldable ]
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[(cdar _) foldable ]
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[(cddr _) foldable ]
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[(caaar _) foldable ]
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[(caadr _) foldable ]
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[(cadar _) foldable ]
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[(caddr _) foldable ]
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[(cdaar _) foldable ]
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[(cdadr _) foldable ]
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[(cddar _) foldable ]
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[(cdddr _) foldable ]
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[(caaaar _) foldable ]
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[(caaadr _) foldable ]
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[(caadar _) foldable ]
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[(caaddr _) foldable ]
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[(cadaar _) foldable ]
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[(cadadr _) foldable ]
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[(caddar _) foldable ]
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[(cadddr _) foldable ]
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[(cdaaar _) foldable ]
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[(cdaadr _) foldable ]
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[(cdadar _) foldable ]
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[(cdaddr _) foldable ]
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[(cddaar _) foldable ]
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[(cddadr _) foldable ]
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[(cdddar _) foldable ]
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[(cddddr _) foldable ]
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[(memq _ _) foldable ]
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[(memv _ _) foldable ]
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[(length _) foldable result-true]
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[(+ . _) foldable result-true]
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[(* . _) foldable result-true]
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[(/ _ . _) foldable result-true]
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[(- _ . _) foldable result-true]
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[(fx+ _ _) foldable result-true]
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[(fx- _ _) foldable result-true]
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[(fx* _ _) foldable result-true]
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[(fxior . _) foldable result-true]
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[(fxlogor . _) foldable result-true]
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[(fxnot _) foldable result-true]
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[(fxadd1 _) foldable result-true]
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[(fxsub1 _) foldable result-true]
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[(fxzero? _) foldable ]
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[(fx=? _ . _) foldable ]
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[(fx<? _ . _) foldable ]
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[(fx<=? _ . _) foldable ]
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[(fx>? _ . _) foldable ]
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[(fx>=? _ . _) foldable ]
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[(fx= _ . _) foldable ]
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[(fx< _ . _) foldable ]
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[(fx<= _ . _) foldable ]
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[(fx> _ . _) foldable ]
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[(fx>= _ . _) foldable ]
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[(real-part _) foldable result-true]
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[(imag-part _) foldable result-true]
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[(fxsll _ _) foldable result-true]
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[(fxsra _ _) foldable result-true]
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[(fxremainder _ _) foldable result-true]
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[(fxquotient _ _) foldable result-true]
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[(greatest-fixnum) foldable effect-free result-true]
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[(least-fixnum) foldable effect-free result-true]
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[(fixnum-width) foldable effect-free result-true]
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[(char->integer _) foldable result-true]
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[(integer->char _) foldable result-true]
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[(eof-object) foldable effect-free result-true]
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[(zero? _) foldable ]
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[(= _ . _) foldable ]
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[(< _ . _) foldable ]
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[(<= _ . _) foldable ]
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[(> _ . _) foldable ]
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[(>= _ . _) foldable ]
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[(expt _ _) foldable result-true]
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[(log _) foldable result-true]
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[(sll _ _) foldable result-true]
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[(sra _ _) foldable result-true]
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[(inexact _) foldable result-true]
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[(exact _) foldable result-true]
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[(add1 _) foldable result-true]
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[(sub1 _) foldable result-true]
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[(bitwise-and _ _) foldable result-true]
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[(make-rectangular _ _) foldable result-true]
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[(sin _) foldable result-true]
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[(cos _) foldable result-true]
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[(tan _) foldable result-true]
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[(asin _) foldable result-true]
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[(acos _) foldable result-true]
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[(atan _) foldable result-true]
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[(make-eq-hashtable) effect-free result-true]
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[(string->number _) foldable ]
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[(string->number _ _) foldable ]
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[($fixnum->flonum _) foldable effect-free result-true]
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[($char->fixnum _) foldable effect-free result-true]
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[($fixnum->char _) foldable effect-free result-true]
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[($fxzero? _) foldable effect-free ]
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[($fx+ _ _) foldable effect-free result-true]
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[($fx* _ _) foldable effect-free result-true]
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[($fx- _ _) foldable effect-free result-true]
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[($fx= _ _) foldable effect-free ]
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[($fx>= _ _) foldable effect-free ]
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[($fx> _ _) foldable effect-free ]
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[($fx<= _ _) foldable effect-free ]
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[($fx< _ _) foldable effect-free ]
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[($car _) foldable effect-free ]
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[($cdr _) foldable effect-free ]
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[($struct-ref _ _) foldable effect-free ]
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[($struct/rtd? _ _) foldable effect-free ]
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[($fxsll _ _) foldable effect-free result-true]
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[($fxsra _ _) foldable effect-free result-true]
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[($fxlogor _ _) foldable effect-free result-true]
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[($fxlogand _ _) foldable effect-free result-true]
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[($fxadd1 _) foldable effect-free result-true]
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[($fxsub1 _) foldable effect-free result-true]
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[($vector-length _) foldable effect-free result-true]
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[($vector-ref _ _) foldable effect-free result-true]
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[($make-bytevector 0) foldable effect-free result-true]
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[($make-bytevector 0 _) foldable effect-free result-true]
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[($make-bytevector . _) effect-free result-true]
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[($bytevector-u8-ref _ _) foldable effect-free result-true]
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[($bytevector-length _) foldable effect-free result-true]
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;;;
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[(annotation? #f) foldable effect-free result-false]
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[(annotation-stripped #f) foldable effect-free result-false]
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;;; unoptimizable
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[(condition . _)]
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[($make-flonum . _)]
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[(top-level-value . _)]
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[($struct . _)]
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[(make-message-condition . _)]
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[(make-lexical-violation . _)]
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[(make-who-condition . _)]
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[(make-error . _)]
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[(make-i/o-error . _)]
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[(make-i/o-write-error . _)]
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[(make-i/o-read-error . _)]
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[(make-i/o-file-already-exists-error . _)]
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[(make-i/o-file-is-read-only-error . _)]
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[(make-i/o-file-protection-error . _)]
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[(make-i/o-file-does-not-exist-error . _)]
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[(make-undefined-violation . _)]
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[(die . _)]
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[(gensym . _)]
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[(values . _)]
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[(error . _)]
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[(assertion-violation . _)]
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[(console-input-port . _)]
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[(console-output-port . _)]
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[(console-error-port . _)]
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[(printf . _)] ;;; FIXME: reduce to display
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[(newline . _)]
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[(native-transcoder . _)]
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[(open-string-output-port . _)]
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[(open-string-input-port . _)]
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[(environment . _)]
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[(print-gensym . _)]
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[(exit . _)]
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[(interrupt-handler . _)]
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[(display . _)]
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[(write-char . _)]
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[(current-input-port . _)]
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[(current-output-port . _)]
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[(current-error-port . _)]
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[(standard-input-port . _)]
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[(standard-output-port . _)]
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[(standard-error-port . _)]
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[($current-frame . _)]
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[(pretty-width . _)]
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[($fp-at-base . _)]
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[(read-annotated . _)]
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[($collect-key . _)]
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[(make-non-continuable-violation . _)]
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[(format . _)] ;;; FIXME, reduce to string-copy
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[(uuid . _)]
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[(print-graph . _)]
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[(interaction-environment . _)]
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[(make-guardian)]
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[(command-line-arguments)]
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[(make-record-type-descriptor . _)] ;;; FIXME
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[(make-assertion-violation . _)]
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[(new-cafe . _)]
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[(getenv . _)]
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[(gensym-prefix . _)]
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[($arg-list . _)]
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[($make-symbol . _)]
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[(string->utf8 . _)]
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[($make-call-with-values-procedure . _)]
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[($make-values-procedure . _)]
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[($unset-interrupted! . _)]
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[(make-interrupted-condition . _)]
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[($interrupted? . _)]
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[($symbol-value . _)]
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[(library-extensions . _)]
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[(base-rtd . _)]
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[($data->transcoder . _)]
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[(current-time . _)]
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))
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(module (primprop)
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(define-syntax ct-gensym
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(lambda (x)
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(with-syntax ([g (datum->syntax #'here (gensym))])
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#'(quote g))))
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(define g (ct-gensym))
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(define (primprop p)
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(or (getprop p g) '()))
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(define (get prim ls)
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(cond
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[(null? ls) (values '() '())]
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[else
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(let ([a (car ls)])
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(let ([cc (car a)])
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(cond
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[(eq? (car cc) prim)
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(let-values ([(p* ls) (get prim (cdr ls))])
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(values (cons (cons (cdr cc) (cdr a)) p*) ls))]
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[else (values '() ls)])))]))
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(let f ([ls primitive-info-list])
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(unless (null? ls)
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(let ([a (car ls)])
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(let ([cc (car a)] [cv (cdr a)])
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(let ([prim (car cc)] [args (cdr cc)])
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(let-values ([(p* ls) (get prim (cdr ls))])
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(putprop prim g
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(cons (cons args cv) p*))
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(f ls))))))))
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(define (primitive-info op args)
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(define (matches? x)
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(let f ([args args] [params (car x)])
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(cond
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[(pair? params)
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(and (pair? args)
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(case (car params)
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[(_) (f (cdr args) (cdr params))]
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[(#f 0 ())
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(let ([v (value-visit-operand! (car args))])
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(and (constant? v)
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(equal? (constant-value v) (car params))
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(f (cdr args) (cdr params))))]
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[else
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(error 'primitive-info "cannot happen" op (car params))]))]
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[(eq? params '_) #t]
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[(null? params) (null? args)]
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[else (error 'primitive-info "cannot happen" op params)])))
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(cond
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[(find matches? (primprop op))]
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[else '()]))
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(define (info-foldable? info) (memq 'foldable info))
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(define (info-effect-free? info) (memq 'effect-free info))
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(define (info-result-true? info) (memq 'result-true info))
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(define (info-result-false? info) (memq 'result-false info))
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(define-syntax ctxt-case
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(lambda (stx)
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(define (test x)
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(case (syntax->datum x)
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[(p) #'(eq? t 'p)]
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[(v) #'(eq? t 'v)]
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[(e) #'(eq? t 'e)]
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[(app) #'(app? t)]
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[else (syntax-violation stx "invalid ctxt" x)]))
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(define (extract cls*)
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(syntax-case cls* (else)
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[() #'(error 'extract "unmatched ctxt" t)]
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[([else e e* ...]) #'(begin e e* ...)]
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[([(t* ...) e e* ...] rest ...)
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(with-syntax ([(t* ...) (map test #'(t* ...))]
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[body (extract #'(rest ...))])
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#'(if (or t* ...)
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(begin e e* ...)
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body))]))
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(syntax-case stx ()
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[(_ expr cls* ...)
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(with-syntax ([body (extract #'(cls* ...))])
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#'(let ([t expr])
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body))])))
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(define (mkseq e0 e1)
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;;; returns a (seq e0 e1) with a seq-less e1 if both
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;;; e0 and e1 are constructed properly.
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(if (simple? e0)
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e1
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(let ([e0 (struct-case e0
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[(seq e0a e0b) (if (simple? e0b) e0a e0)]
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[else e0])])
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(struct-case e1
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[(seq e1a e1b) (make-seq (make-seq e0 e1a) e1b)]
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[else (make-seq e0 e1)]))))
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;;; simple?: check quickly whether something is effect-free
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(define (simple? x)
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|
(struct-case x
|
|
[(constant) #t]
|
|
[(prelex) #t]
|
|
[(primref) #t]
|
|
[(clambda) #t]
|
|
[else #f]))
|
|
;;; result returns the "last" value of an expression
|
|
(define (result-expr x)
|
|
(struct-case x
|
|
[(seq e0 e1) e1]
|
|
[else x]))
|
|
;;;
|
|
(define (records-equal? x y ctxt)
|
|
(struct-case x
|
|
[(constant kx)
|
|
(struct-case y
|
|
[(constant ky)
|
|
(ctxt-case ctxt
|
|
[(e) #t]
|
|
[(p) (if kx ky (not ky))]
|
|
[else (eq? kx ky)])]
|
|
[else #f])]
|
|
[else #f]))
|
|
;;;
|
|
(define (residualize-operands e rand* sc)
|
|
(cond
|
|
[(null? rand*) e]
|
|
[(not (operand-residualize-for-effect (car rand*)))
|
|
(residualize-operands e (cdr rand*) sc)]
|
|
[else
|
|
(let ([opnd (car rand*)])
|
|
(let ([e1 (or (operand-value opnd)
|
|
(struct-case opnd
|
|
[(operand expr env ec)
|
|
(E expr 'e env ec sc)]))])
|
|
(if (simple? e1)
|
|
(residualize-operands e (cdr rand*) sc)
|
|
(begin
|
|
(decrement sc (operand-size opnd))
|
|
(mkseq e1 (residualize-operands e (cdr rand*) sc))))))]))
|
|
(define (value-visit-operand! rand)
|
|
(or (operand-value rand)
|
|
(let ([sc (passive-counter)])
|
|
(let ([e (struct-case rand
|
|
[(operand expr env ec)
|
|
(E expr 'v env sc ec)])])
|
|
(set-operand-value! rand e)
|
|
(set-operand-size! rand (passive-counter-value sc))
|
|
e))))
|
|
(define (score-value-visit-operand! rand sc)
|
|
(let ([val (value-visit-operand! rand)])
|
|
(let ([score (operand-size rand)])
|
|
(decrement sc score))
|
|
val))
|
|
(define (E-call rator rand* env ctxt ec sc)
|
|
(let ([ctxt (make-app rand* ctxt)])
|
|
(let ([rator (E rator ctxt env ec sc)])
|
|
(if (app-inlined ctxt)
|
|
(residualize-operands rator rand* sc)
|
|
(begin
|
|
(decrement sc (if (primref? rator) 1 3))
|
|
(make-funcall rator
|
|
(map (lambda (x) (score-value-visit-operand! x sc))
|
|
rand*)))))))
|
|
;;;
|
|
(define (E-var x ctxt env ec sc)
|
|
(ctxt-case ctxt
|
|
[(e) (make-constant (void))]
|
|
[else
|
|
(let ([x (lookup x env)])
|
|
(let ([opnd (prelex-operand x)])
|
|
(if (and opnd (not (operand-inner-pending opnd)))
|
|
(begin
|
|
(dynamic-wind
|
|
(lambda () (set-operand-inner-pending! opnd #t))
|
|
(lambda () (value-visit-operand! opnd))
|
|
(lambda () (set-operand-inner-pending! opnd #f)))
|
|
(if (prelex-source-assigned? x)
|
|
(residualize-ref x sc)
|
|
(copy x opnd ctxt ec sc)))
|
|
(residualize-ref x sc))))]))
|
|
;;;
|
|
(define (copy x opnd ctxt ec sc)
|
|
(let ([rhs (result-expr (operand-value opnd))])
|
|
(struct-case rhs
|
|
[(constant) rhs]
|
|
[(prelex)
|
|
(if (prelex-source-assigned? rhs)
|
|
(residualize-ref x sc)
|
|
(let ([opnd (prelex-operand rhs)])
|
|
(if (and opnd (operand-value opnd))
|
|
(copy2 rhs opnd ctxt ec sc)
|
|
(residualize-ref rhs sc))))]
|
|
[else (copy2 x opnd ctxt ec sc)])))
|
|
;;;
|
|
(define (copy2 x opnd ctxt ec sc)
|
|
(let ([rhs (result-expr (operand-value opnd))])
|
|
(struct-case rhs
|
|
[(clambda)
|
|
(ctxt-case ctxt
|
|
[(v) (residualize-ref x sc)]
|
|
[(p) (make-constant #t)]
|
|
[(e) (make-constant (void))]
|
|
[(app)
|
|
(or (and (not (operand-outer-pending opnd))
|
|
(dynamic-wind
|
|
(lambda () (set-operand-outer-pending! opnd #t))
|
|
(lambda ()
|
|
(call/cc
|
|
(lambda (abort)
|
|
(inline rhs ctxt empty-env
|
|
(if (active-counter? ec)
|
|
ec
|
|
(make-counter
|
|
(cp0-effort-limit)
|
|
ctxt abort))
|
|
(make-counter
|
|
(if (active-counter? sc)
|
|
(counter-value sc)
|
|
(cp0-size-limit))
|
|
ctxt abort)))))
|
|
(lambda () (set-operand-outer-pending! opnd #f))))
|
|
(residualize-ref x sc))])]
|
|
[(primref p)
|
|
(ctxt-case ctxt
|
|
[(v) rhs]
|
|
[(p) (make-constant #t)]
|
|
[(e) (make-constant (void))]
|
|
[(app) (fold-prim p ctxt ec sc)])]
|
|
[else (residualize-ref x sc)])))
|
|
(define (inline proc ctxt env ec sc)
|
|
(define (get-case cases rand*)
|
|
(define (compatible? x)
|
|
(struct-case (clambda-case-info x)
|
|
[(case-info label args proper)
|
|
(cond
|
|
[proper (= (length rand*) (length args))]
|
|
[else (>= (length rand*) (- (length args) 1))])]))
|
|
(cond
|
|
[(memp compatible? cases) => car]
|
|
[else #f]))
|
|
(define (partition args rand*)
|
|
(cond
|
|
[(null? (cdr args))
|
|
(let ([r (car args)])
|
|
(let ([t* (map (lambda (x) (copy-var r)) rand*)])
|
|
(values '() t* r)))]
|
|
[else
|
|
(let ([x (car args)])
|
|
(let-values ([(x* t* r) (partition (cdr args) (cdr rand*))])
|
|
(values (cons x x*) t* r)))]))
|
|
(struct-case proc
|
|
[(clambda g cases cp free name)
|
|
(let ([rand* (app-rand* ctxt)])
|
|
(struct-case (get-case cases rand*)
|
|
[(clambda-case info body)
|
|
(struct-case info
|
|
[(case-info label args proper)
|
|
(cond
|
|
[proper
|
|
(with-extended-env ((env args) (env args rand*))
|
|
(let ([body (E body (app-ctxt ctxt) env ec sc)])
|
|
(let ([result (make-let-binding args rand* body sc)])
|
|
(set-app-inlined! ctxt #t)
|
|
result)))]
|
|
[else
|
|
(let-values ([(x* t* r) (partition args rand*)])
|
|
(with-extended-env ((env a*)
|
|
(env (append x* t*) rand*))
|
|
(let ([rarg (make-operand
|
|
(make-funcall (make-primref 'list) t*)
|
|
env ec)])
|
|
(with-extended-env ((env b*)
|
|
(env (list r) (list rarg)))
|
|
(let ([result
|
|
(make-let-binding a* rand*
|
|
(make-let-binding b* (list rarg)
|
|
(E body (app-ctxt ctxt) env ec sc)
|
|
sc)
|
|
sc)])
|
|
(set-app-inlined! ctxt #t)
|
|
result)))))])])]
|
|
[else
|
|
(E proc 'v env ec sc)]))]))
|
|
;;;
|
|
(define (do-bind lhs* rhs* body ctxt env ec sc)
|
|
(let ([rand* (map (lambda (x) (make-operand x env ec)) rhs*)])
|
|
(with-extended-env ((env lhs*) (env lhs* rand*))
|
|
(residualize-operands
|
|
(make-let-binding lhs* rand*
|
|
(E body ctxt env ec sc)
|
|
sc)
|
|
rand* sc))))
|
|
;;;
|
|
(define (make-let-binding var* rand* body sc)
|
|
(define (process1 var rand lhs* rhs*)
|
|
(cond
|
|
[(prelex-residual-referenced? var)
|
|
(values
|
|
(cons var lhs*)
|
|
(cons (score-value-visit-operand! rand sc) rhs*))]
|
|
[(prelex-residual-assigned? var)
|
|
(set-operand-residualize-for-effect! rand #t)
|
|
(values
|
|
(cons var lhs*)
|
|
(cons (make-constant (void)) rhs*))]
|
|
[else
|
|
(set-operand-residualize-for-effect! rand #t)
|
|
(values lhs* rhs*)]))
|
|
(define (process var* rand*)
|
|
(cond
|
|
[(null? var*) (values '() '())]
|
|
[else
|
|
(let ([var (car var*)] [rand (car rand*)])
|
|
(let-values ([(lhs* rhs*) (process (cdr var*) (cdr rand*))])
|
|
(process1 var rand lhs* rhs*)))]))
|
|
(let-values ([(lhs* rhs*) (process var* rand*)])
|
|
(if (null? lhs*) body (make-bind lhs* rhs* body))))
|
|
;;;
|
|
(define (fold-prim p ctxt ec sc)
|
|
(define (get-value p ls)
|
|
(call/cc
|
|
(lambda (k)
|
|
(with-exception-handler
|
|
(lambda (con)
|
|
(decrement ec 10)
|
|
(k #f))
|
|
(lambda ()
|
|
(make-constant (apply (system-value p) ls)))))))
|
|
(let ([rand* (app-rand* ctxt)])
|
|
(let ([info (primitive-info p rand*)])
|
|
(let ([result
|
|
(or (and (info-effect-free? info)
|
|
(ctxt-case (app-ctxt ctxt)
|
|
[(e) (make-constant (void))]
|
|
[(p)
|
|
(cond
|
|
[(info-result-true? info)
|
|
(make-constant #t)]
|
|
[(info-result-false? info)
|
|
(make-constant #f)]
|
|
[else #f])]
|
|
[else #f]))
|
|
(and (info-foldable? info)
|
|
(let ([val*
|
|
(map (lambda (x) (value-visit-operand! x)) rand*)])
|
|
(cond
|
|
[(andmap constant? val*)
|
|
(get-value p (map constant-value val*))]
|
|
[else #f]))))])
|
|
(if result
|
|
(begin
|
|
(decrement ec 1)
|
|
(for-each
|
|
(lambda (x)
|
|
(set-operand-residualize-for-effect! x #t))
|
|
rand*)
|
|
(set-app-inlined! ctxt #t)
|
|
result)
|
|
(begin
|
|
(decrement sc 1)
|
|
(make-primref p)))))))
|
|
;;;
|
|
(define (residualize-ref x sc)
|
|
(decrement sc 1)
|
|
(set-prelex-residual-referenced?! x #t)
|
|
x)
|
|
;;;
|
|
(define (build-conditional e0 e1 e2)
|
|
(or (struct-case e0
|
|
[(funcall rator rand*)
|
|
(struct-case rator
|
|
[(primref op)
|
|
(and (eq? op 'not)
|
|
(= (length rand*) 1)
|
|
(build-conditional (car rand*) e2 e1))]
|
|
[else #f])]
|
|
[else #f])
|
|
(make-conditional e0 e1 e2)))
|
|
|
|
(define (E x ctxt env ec sc)
|
|
(decrement ec 1)
|
|
(struct-case x
|
|
[(constant) (decrement sc 1) x]
|
|
[(prelex) (E-var x ctxt env ec sc)]
|
|
[(seq e0 e1)
|
|
(mkseq (E e0 'e env ec sc) (E e1 ctxt env ec sc))]
|
|
[(conditional e0 e1 e2)
|
|
(let ([e0 (E e0 'p env ec sc)])
|
|
(struct-case (result-expr e0)
|
|
[(constant k)
|
|
(mkseq e0 (E (if k e1 e2) ctxt env ec sc))]
|
|
[else
|
|
(let ([ctxt (ctxt-case ctxt [(app) 'v] [else ctxt])])
|
|
(let ([e1 (E e1 ctxt env ec sc)]
|
|
[e2 (E e2 ctxt env ec sc)])
|
|
(if (records-equal? e1 e2 ctxt)
|
|
(mkseq e0 e1)
|
|
(begin
|
|
(decrement sc 1)
|
|
(build-conditional e0 e1 e2)))))]))]
|
|
[(assign x v)
|
|
(mkseq
|
|
(let ([x (lookup x env)])
|
|
(cond
|
|
[(not (prelex-source-referenced? x))
|
|
;;; dead on arrival
|
|
(E v 'e env ec sc)]
|
|
[else
|
|
(decrement sc 1)
|
|
(set-prelex-residual-assigned?! x
|
|
(prelex-source-assigned? x))
|
|
(make-assign x (E v 'v env ec sc))]))
|
|
(make-constant (void)))]
|
|
[(funcall rator rand*)
|
|
(E-call rator
|
|
(map (lambda (x) (make-operand x env ec)) rand*)
|
|
env ctxt ec sc)]
|
|
[(forcall name rand*)
|
|
(decrement sc 1)
|
|
(make-forcall name (map (lambda (x) (E x 'v env ec sc)) rand*))]
|
|
[(primref name)
|
|
(ctxt-case ctxt
|
|
[(app) (fold-prim name ctxt ec sc)]
|
|
[(v) (decrement sc 1) x]
|
|
[else (make-constant #t)])]
|
|
[(clambda g cases cp free name)
|
|
(ctxt-case ctxt
|
|
[(app) (inline x ctxt env ec sc)]
|
|
[(p e) (make-constant #t)]
|
|
[else
|
|
(decrement sc 2)
|
|
(make-clambda (gensym)
|
|
(map
|
|
(lambda (x)
|
|
(struct-case x
|
|
[(clambda-case info body)
|
|
(struct-case info
|
|
[(case-info label args proper)
|
|
(with-extended-env ((env args) (env args #f))
|
|
(make-clambda-case
|
|
(make-case-info (gensym) args proper)
|
|
(E body 'v env ec sc)))])]))
|
|
cases)
|
|
cp free name)])]
|
|
[(bind lhs* rhs* body)
|
|
(do-bind lhs* rhs* body ctxt env ec sc)]
|
|
[(fix lhs* rhs* body)
|
|
(with-extended-env ((env lhs*) (env lhs* #f))
|
|
(for-each
|
|
(lambda (lhs rhs)
|
|
(set-prelex-operand! lhs (make-operand rhs env ec)))
|
|
lhs* rhs*)
|
|
(let ([body (E body ctxt env ec sc)])
|
|
(let ([lhs* (remp
|
|
(lambda (x)
|
|
(not (prelex-residual-referenced? x)))
|
|
lhs*)])
|
|
(cond
|
|
[(null? lhs*) body]
|
|
[else
|
|
(decrement sc 1)
|
|
(make-fix lhs*
|
|
(map (lambda (x)
|
|
(let ([opnd (prelex-operand x)])
|
|
(decrement sc (+ (operand-size opnd) 1))
|
|
(value-visit-operand! opnd)))
|
|
lhs*)
|
|
body)]))))]
|
|
[else
|
|
(error who "invalid expression" x)]))
|
|
(define empty-env '())
|
|
(define (lookup x env)
|
|
(cond
|
|
[(vector? env)
|
|
(let f ([lhs* (vector-ref env 0)] [rhs* (vector-ref env 1)])
|
|
(cond
|
|
[(null? lhs*) (lookup x (vector-ref env 2))]
|
|
[(eq? x (car lhs*)) (car rhs*)]
|
|
[else (f (cdr lhs*) (cdr rhs*))]))]
|
|
[else x]))
|
|
(define optimize-level
|
|
(make-parameter 1
|
|
(lambda (x)
|
|
(if (memv x '(0 1 2))
|
|
x
|
|
(die 'optimize-level "valid levels are 0, 1, and 2")))))
|
|
(define (source-optimize expr)
|
|
(define (source-optimize expr)
|
|
(E expr 'v empty-env (passive-counter) (passive-counter)))
|
|
(case (optimize-level)
|
|
[(2) (source-optimize expr)]
|
|
[(1)
|
|
(parameterize ([cp0-size-limit 0])
|
|
(source-optimize expr))]
|
|
[else expr]))
|
|
)
|
|
|
|
|
|
|
|
|