524 lines
18 KiB
Scheme
524 lines
18 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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;(module primops (primop? cogen-primop)
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; (define (primop? x) #f)
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; (define cogen-primop (lambda args (error 'cogen-primop "not yet"))))
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;
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;#!eof
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;(define-syntax export-all-module
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; (syntax-rules (define)
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; [(_ M (define name* v*) ...)
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; (module M (name* ...)
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; (define name* v*) ...)]))
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;
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;(export-all-module object-representation
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; (define fixnum-scale 4)
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; (define fixnum-shift 2)
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; (define fixnum-tag 0)
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; (define fixnum-mask 3))
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(module primops (primop? get-primop set-primop!)
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(define cookie (gensym))
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(define (primop? x)
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(and (getprop x cookie) #t))
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(define (get-primop x)
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(or (getprop x cookie)
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(error 'getprimop "not a primitive" x)))
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(define (set-primop! x v)
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(putprop x cookie v))
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)
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(module (specify-representation)
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;(import object-representation)
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(import primops)
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(define-struct PH
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(interruptable? p-handler p-handled? v-handler v-handled? e-handler e-handled?))
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(define interrupt-handler
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(make-parameter (lambda () (error 'interrupt-handler "uninitialized"))))
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(define (interrupt)
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((interrupt-handler))
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(prm 'interrupt))
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(define (primop-interrupt-handler x)
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(case x
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[(fx+) 'error@fx+]
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[(fx-) 'error@fx-]
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[(fx*) 'error@fx*]
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[(add1) 'error@add1]
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[(sub1) 'error@sub1]
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[(fxadd1) 'error@fxadd1]
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[(fxsub1) 'error@fxsub1]
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[(fxarithmetic-shift-left) 'error@fxarithmetic-shift-left]
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[else x]))
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(define (make-interrupt-call op args)
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(make-funcall
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(V (make-primref (primop-interrupt-handler op)))
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args))
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(define (make-no-interrupt-call op args)
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(make-funcall (V (make-primref op)) args))
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(define (with-interrupt-handler p x ctxt args k)
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(cond
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[(not (PH-interruptable? p))
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(parameterize ([interrupt-handler
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(lambda ()
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(error 'cogen "uninterruptable"
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x args ctxt))])
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(k))]
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[else
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(let ([interrupted? #f])
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(let ([body
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(parameterize ([interrupt-handler
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(lambda () (set! interrupted? #t))])
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(k))])
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(cond
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[(not interrupted?) body]
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[(eq? ctxt 'V)
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(let ([h (make-interrupt-call x args)])
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(if (struct-case body
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[(primcall op) (eq? op 'interrupt)]
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[else #f])
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(make-no-interrupt-call x args)
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(make-shortcut body h)))]
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[(eq? ctxt 'E)
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(let ([h (make-interrupt-call x args)])
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(if (struct-case body
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[(primcall op) (eq? op 'interrupt)]
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[else #f])
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(make-no-interrupt-call x args)
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(make-shortcut body h)))]
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[(eq? ctxt 'P)
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(let ([h (prm '!= (make-interrupt-call x args) (K bool-f))])
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(if (struct-case body
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[(primcall op) (eq? op 'interrupt)]
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[else #f])
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(prm '!= (make-no-interrupt-call x args) (K bool-f))
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(make-shortcut body h)))]
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[else (error 'with-interrupt-handler "invalid context" ctxt)])))]))
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(define-syntax with-tmp
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(lambda (x)
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(syntax-case x ()
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[(_ ([lhs* rhs*] ...) b b* ...)
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(with-syntax ([(n* ...) (generate-temporaries #'(lhs* ...))])
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#'(let ([lhs* rhs*] ...)
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(let ([n* (unique-var 'lhs*)] ...)
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(make-bind (list n* ...) (list lhs* ...)
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(let ([lhs* n*] ...)
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(seq* b b* ...))))))])))
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;;; if ctxt is V:
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;;; if cogen-value, then V
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;;; if cogen-pred, then (if P #f #t)
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;;; if cogen-effect, then (seq E (void))
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;;;
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;;; if ctxt is P:
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;;; if cogen-pred, then P
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;;; if cogen-value, then (!= V #f)
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;;; if cogen-effect, then (seq E #t)
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;;;
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;;; if ctxt is E:
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;;; if cogen-effect, then E
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;;; if cogen-value, then (let ([tmp V]) (nop))
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;;; if cogen-pred, then (if P (nop) (nop))
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(define (simplify* args k)
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(define (S* ls)
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(cond
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[(null? ls) (values '() '() '())]
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[else
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(let-values ([(lhs* rhs* arg*) (S* (cdr ls))])
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(let ([a (car ls)])
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(struct-case a
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[(known expr type v)
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(let ([tmp (unique-var 'tmp)])
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(values (cons tmp lhs*)
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(cons (V expr) rhs*)
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(cons (make-known tmp type v) arg*)))]
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[(constant i)
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(values lhs* rhs* (cons a arg*))]
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[else
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(let ([t (unique-var 'tmp)])
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(values (cons t lhs*) (cons (V a) rhs*) (cons t arg*)))])))]))
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(let-values ([(lhs* rhs* args) (S* args)])
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(cond
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[(null? lhs*) (k args)]
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[else
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(make-bind lhs* rhs* (k args))])))
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(define (cogen-primop x ctxt args)
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(define (interrupt? x)
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(struct-case x
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[(primcall x) (eq? x 'interrupt)]
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[else #f]))
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(let ([p (get-primop x)])
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(simplify* args
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(lambda (args)
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(with-interrupt-handler p x ctxt (map T args)
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(lambda ()
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(case ctxt
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[(P)
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(cond
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[(PH-p-handled? p)
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(apply (PH-p-handler p) args)]
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[(PH-v-handled? p)
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(let ([e (apply (PH-v-handler p) args)])
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(if (interrupt? e) e (prm '!= e (K bool-f))))]
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[(PH-e-handled? p)
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(let ([e (apply (PH-e-handler p) args)])
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(if (interrupt? e) e (make-seq e (K #t))))]
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[else (error 'cogen-primop "not handled" x)])]
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[(V)
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(cond
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[(PH-v-handled? p)
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(apply (PH-v-handler p) args)]
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[(PH-p-handled? p)
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(let ([e (apply (PH-p-handler p) args)])
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(if (interrupt? e)
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e
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(make-conditional e (K bool-t) (K bool-f))))]
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[(PH-e-handled? p)
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(let ([e (apply (PH-e-handler p) args)])
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(if (interrupt? e) e (make-seq e (K void-object))))]
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[else (error 'cogen-primop "not handled" x)])]
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[(E)
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(cond
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[(PH-e-handled? p)
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(apply (PH-e-handler p) args)]
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[(PH-p-handled? p)
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(let ([e (apply (PH-p-handler p) args)])
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(if (interrupt? e)
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e
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(make-conditional e (prm 'nop) (prm 'nop))))]
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[(PH-v-handled? p)
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(let ([e (apply (PH-v-handler p) args)])
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(if (interrupt? e)
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e
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(with-tmp ([t e]) (prm 'nop))))]
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[else (error 'cogen-primop "not handled" x)])]
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[else
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(error 'cogen-primop "invalid context" ctxt)])))))))
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(define-syntax define-primop
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(lambda (x)
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(define (cogen-name stx name suffix)
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(datum->syntax stx
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(string->symbol
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(format "cogen-~a-~a"
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suffix
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(syntax->datum name)))))
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(define (generate-handler name ctxt case*)
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(define (filter-cases case*)
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(syntax-case case* ()
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[() '()]
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[([(c . arg*) b b* ...] . rest)
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(free-identifier=? #'c ctxt)
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(cons #'[arg* b b* ...] (filter-cases #'rest))]
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[(c . rest) (filter-cases #'rest)]))
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(let ([case* (filter-cases case*)])
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(with-syntax ([ctxt ctxt] [name name]
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[(case* ...) case*]
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[handled? (not (null? case*))])
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#'[(case-lambda
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case* ...
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[args (interrupt)])
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handled?])))
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(syntax-case x ()
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[(stx name int? case* ...)
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(with-syntax ([cogen-p (cogen-name #'stx #'name "pred")]
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[cogen-e (cogen-name #'stx #'name "effect")]
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[cogen-v (cogen-name #'stx #'name "value")]
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[interruptable?
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(syntax-case #'int? (safe unsafe)
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[safe #t] [unsafe #f])]
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[(p-handler phandled?)
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(generate-handler #'name #'P #'(case* ...))]
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[(v-handler vhandled?)
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(generate-handler #'name #'V #'(case* ...))]
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[(e-handler ehandled?)
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(generate-handler #'name #'E #'(case* ...))])
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#'(begin
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(define cogen-p p-handler)
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(define cogen-v v-handler)
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(define cogen-e e-handler)
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(module ()
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(set-primop! 'name
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(make-PH interruptable?
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cogen-p phandled?
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cogen-v vhandled?
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cogen-e ehandled?)))))])))
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(define (handle-fix lhs* rhs* body)
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(define (closure-size x)
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(struct-case x
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[(closure code free*)
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(if (null? free*)
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0
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(align (+ disp-closure-data
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(* (length free*) wordsize))))]))
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(define (partition p? lhs* rhs*)
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(cond
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[(null? lhs*) (values '() '() '() '())]
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[else
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(let-values ([(a* b* c* d*)
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(partition p? (cdr lhs*) (cdr rhs*))]
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[(x y) (values (car lhs*) (car rhs*))])
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(cond
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[(p? x y)
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(values (cons x a*) (cons y b*) c* d*)]
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[else
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(values a* b* (cons x c*) (cons y d*))]))]))
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(define (combinator? lhs rhs)
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(struct-case rhs
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[(closure code free*) (null? free*)]))
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(define (sum n* n)
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(cond
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[(null? n*) n]
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[else (sum (cdr n*) (+ n (car n*)))]))
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(define (adders lhs n n*)
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(cond
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[(null? n*) '()]
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[else
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(cons (prm 'int+ lhs (K n))
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(adders lhs (+ n (car n*)) (cdr n*)))]))
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(define (build-closures lhs* rhs* body)
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(let ([lhs (car lhs*)] [rhs (car rhs*)]
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[lhs* (cdr lhs*)] [rhs* (cdr rhs*)])
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(let ([n (closure-size rhs)]
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[n* (map closure-size rhs*)])
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(make-bind (list lhs)
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(list (prm 'alloc
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(K (sum n* n))
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(K closure-tag)))
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(make-bind lhs* (adders lhs n n*)
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body)))))
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(define (build-setters lhs* rhs* body)
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(define (build-setter lhs rhs body)
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(struct-case rhs
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[(closure code free*)
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(make-seq
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(prm 'mset lhs
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(K (- disp-closure-code closure-tag))
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(V code))
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(let f ([ls free*]
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[i (- disp-closure-data closure-tag)])
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(cond
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[(null? ls) body]
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[else
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(make-seq
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(prm 'mset lhs (K i) (V (car ls)))
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(f (cdr ls) (+ i wordsize)))])))]))
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(cond
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[(null? lhs*) body]
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[else
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(build-setter (car lhs*) (car rhs*)
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(build-setters (cdr lhs*) (cdr rhs*) body))]))
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(let-values ([(flhs* frhs* clhs* crhs*)
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(partition combinator? lhs* rhs*)])
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(cond
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[(null? clhs*) (make-bind flhs* (map V frhs*) body)]
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[(null? flhs*)
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(build-closures clhs* crhs*
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(build-setters clhs* crhs* body))]
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[else
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(make-bind flhs* (map V frhs*)
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(build-closures clhs* crhs*
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(build-setters clhs* crhs* body)))])))
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(define (constant-rep x)
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(let ([c (constant-value x)])
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(cond
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[(fx? c) (make-constant (* c fx-scale))]
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[(boolean? c) (make-constant (if c bool-t bool-f))]
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[(eq? c (void)) (make-constant void-object)]
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[(bwp-object? c) (make-constant bwp-object)]
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[(char? c) (make-constant
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(fxlogor char-tag
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(fxsll (char->integer c) char-shift)))]
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[(null? c) (make-constant nil)]
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[(eof-object? c) (make-constant eof)]
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[(object? c) (error 'constant-rep "double-wrap")]
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[else (make-constant (make-object c))])))
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(define (V x) ;;; erase known values
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(struct-case x
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[(known x type value)
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(unknown-V x)]
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[else (unknown-V x)]))
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(define (unknown-V x)
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(struct-case x
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[(constant) (constant-rep x)]
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[(var) x]
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[(primref name)
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(prm 'mref
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(K (make-object (primref->symbol name)))
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(K (- disp-symbol-record-value symbol-ptag)))]
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[(code-loc) (make-constant x)]
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[(closure) (make-constant x)]
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[(bind lhs* rhs* body)
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(make-bind lhs* (map V rhs*) (V body))]
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[(fix lhs* rhs* body)
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(handle-fix lhs* rhs* (V body))]
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[(conditional e0 e1 e2)
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(make-conditional (P e0) (V e1) (V e2))]
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[(seq e0 e1)
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(make-seq (E e0) (V e1))]
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[(primcall op arg*)
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(cogen-primop op 'V arg*)]
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[(forcall op arg*)
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(make-forcall op (map V arg*))]
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[(funcall rator arg*)
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(make-funcall (Function rator) (map V arg*))]
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[(jmpcall label rator arg*)
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(make-jmpcall label (V rator) (map V arg*))]
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[else (error 'cogen-V "invalid value expr" x)]))
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(define (P x)
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(struct-case x
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[(constant c) (if c (K #t) (K #f))]
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[(primref) (K #t)]
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[(code-loc) (K #t)]
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[(closure) (K #t)]
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[(bind lhs* rhs* body)
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(make-bind lhs* (map V rhs*) (P body))]
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[(conditional e0 e1 e2)
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(make-conditional (P e0) (P e1) (P e2))]
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[(seq e0 e1)
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(make-seq (E e0) (P e1))]
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[(fix lhs* rhs* body)
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(handle-fix lhs* rhs* (P body))]
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[(primcall op arg*)
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(cogen-primop op 'P arg*)]
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[(var) (prm '!= (V x) (V (K #f)))]
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[(funcall) (prm '!= (V x) (V (K #f)))]
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[(jmpcall) (prm '!= (V x) (V (K #f)))]
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[(forcall) (prm '!= (V x) (V (K #f)))]
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[(known expr type val)
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;;; FIXME: suboptimal
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(P expr)]
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[else (error 'cogen-P "invalid pred expr" x)]))
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(define (E x)
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(struct-case x
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[(constant) (nop)]
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[(var) (nop)]
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[(primref) (nop)]
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[(code-loc) (nop)]
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[(closure) (nop)]
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[(bind lhs* rhs* body)
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(make-bind lhs* (map V rhs*) (E body))]
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[(conditional e0 e1 e2)
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(make-conditional (P e0) (E e1) (E e2))]
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[(seq e0 e1)
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(make-seq (E e0) (E e1))]
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[(fix lhs* rhs* body)
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(handle-fix lhs* rhs* (E body))]
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[(primcall op arg*)
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(cogen-primop op 'E arg*)]
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[(forcall op arg*)
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(make-forcall op (map V arg*))]
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[(funcall rator arg*)
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(make-funcall (Function rator) (map V arg*))]
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[(jmpcall label rator arg*)
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(make-jmpcall label (V rator) (map V arg*))]
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[(known expr type val)
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;;; FIXME: suboptimal
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(E expr)]
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[else (error 'cogen-E "invalid effect expr" x)]))
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(define (Function x)
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(define (nonproc x)
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(with-tmp ([x (V x)])
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(make-shortcut
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(make-seq
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(make-conditional
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(tag-test x closure-mask closure-tag)
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(prm 'nop)
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(prm 'interrupt))
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x)
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(V (make-funcall (make-primref 'error)
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(list (K 'apply) (K "not a procedure") x))))))
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(struct-case x
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[(primcall op args)
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(cond
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[(and (eq? op 'top-level-value)
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(= (length args) 1)
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(struct-case (car args)
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[(constant t)
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(and (symbol? t) t)]
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[else #f])) =>
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(lambda (sym)
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(record-symbol-call! sym)
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(reset-symbol-proc! sym)
|
|
(prm 'mref (T (K sym))
|
|
(K (- disp-symbol-record-proc symbol-ptag))))]
|
|
[else (nonproc x)])]
|
|
[(primref op) (V x)]
|
|
[else (nonproc x)]))
|
|
|
|
|
|
(define encountered-symbol-calls '())
|
|
(define (record-symbol-call! x)
|
|
|
|
(unless (memq x encountered-symbol-calls)
|
|
(set! encountered-symbol-calls
|
|
(cons x encountered-symbol-calls))))
|
|
|
|
|
|
;;;========================================================================
|
|
;;;
|
|
(define (interrupt-unless x)
|
|
(make-conditional x (prm 'nop) (interrupt)))
|
|
(define (interrupt-when x)
|
|
(make-conditional x (interrupt) (prm 'nop)))
|
|
(define (interrupt-unless-fixnum x)
|
|
(interrupt-unless (tag-test x fx-mask fx-tag)))
|
|
|
|
|
|
(define (T x)
|
|
(struct-case x
|
|
[(var) x]
|
|
[(constant i) (constant-rep x)]
|
|
[(known expr type val) (T expr)]
|
|
[else (error 'cogen-T "invalid" (unparse x))]))
|
|
|
|
(define (ClambdaCase x)
|
|
(struct-case x
|
|
[(clambda-case info body)
|
|
(make-clambda-case info (V body))]
|
|
[else (error 'specify-rep "invalid clambda-case" x)]))
|
|
;;;
|
|
(define (Clambda x)
|
|
(struct-case x
|
|
[(clambda label case* cp free* name)
|
|
(make-clambda label
|
|
(map ClambdaCase case*)
|
|
cp free* name)]
|
|
[else (error 'specify-rep "invalid clambda" x)]))
|
|
;;;
|
|
(define (Program x)
|
|
(struct-case x
|
|
[(codes code* body)
|
|
(let ([code* (map Clambda code*)]
|
|
[body (V body)])
|
|
(make-codes code* body))]
|
|
[else (error 'specify-rep "invalid program" x)]))
|
|
|
|
(define (specify-representation x)
|
|
(let ([x (Program x)])
|
|
x))
|
|
|
|
(include "pass-specify-rep-primops.ss"))
|