286 lines
9.6 KiB
Scheme
286 lines
9.6 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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;;; FASL
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;;;
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;;; A fasl object is a header followed by one or more objects followed by an
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;;; end-of-fasl marker
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;;;
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;;; The header is the string "#@IK01"
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;;; The end of fasl marker is "@"
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;;;
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;;; An object is either:
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;;; "N" : denoting the empty list
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;;; "T" : denoting #t
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;;; "F" : denoting #f
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;;; "E" : denoting the end of file object
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;;; "U" : denoting the unspecified value
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;;; "I" + 4-bytes : denoting a fixnum (in host byte order)
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;;; "c" + 1-byte : denoting a small character (<= 255)
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;;; "C" + 4-byte word: big char.
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;;; "P" + object1 + object2 : a pair
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;;; "V" + 4-bytes(n) + object ... : a vector of length n followed by n objects
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;;; "v" + 4-byte(n) + octet ... : a bytevector of length n followed by n octets
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;;; "s" + 4-bytes(n) + octet ... : an ascii string
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;;; "S" + 4-bytes(n) + int ... : a unicode string
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;;; "M" + symbol-name : a symbol
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;;; "G" + pretty-name + unique-name : a gensym
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;;; "R" + rtd-name + rtd-symbol + field-count + field-names
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;;; "{" + field-count + rtd + fields
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;;; ">" + 4-bytes(i) : mark the next object with index i
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;;; "<" + 4-bytes(i) : dereference the object marked with index i
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;;; "x" : denotes code
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;;; "T" : Thunk; followed by code.
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;;; "r" + numerator + denominator : ratnum
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;;; "f" + 8-byte : IEEE flonum
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;;; "b" + 4-byte(n) + n-bytes denotes a bignum (sign is sign of n).
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(library (ikarus fasl read)
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(export fasl-read)
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(import (ikarus)
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(except (ikarus.code-objects) procedure-annotation)
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(ikarus system $codes)
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(ikarus system $structs))
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(define who 'fasl-read)
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(define (assert-eq? x y)
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(unless (eq? x y)
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(die who
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(format "Expected ~s, got ~s\n" y x))))
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(define (char->int x)
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(if (char? x)
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(char->integer x)
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(die who "unexpected eof inside a fasl object")))
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(define (read-fixnum p)
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(let ([c0 (char->int (read-char p))]
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[c1 (char->int (read-char p))]
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[c2 (char->int (read-char p))]
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[c3 (char->int (read-char p))])
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(cond
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[(fx<= c3 127)
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(fxlogor (fxlogor (fxsra c0 2) (fxsll c1 6))
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(fxlogor (fxsll c2 14) (fxsll c3 22)))]
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[else
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(let ([c0 (fxlogand #xFF (fxlognot c0))]
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[c1 (fxlogand #xFF (fxlognot c1))]
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[c2 (fxlogand #xFF (fxlognot c2))]
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[c3 (fxlogand #xFF (fxlognot c3))])
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(fx- -1
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(fxlogor (fxlogor (fxsra c0 2)
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(fxsll c1 6))
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(fxlogor (fxsll c2 14)
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(fxsll c3 22)))))])))
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(define (read-int p)
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(let ([c0 (char->int (read-char p))]
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[c1 (char->int (read-char p))]
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[c2 (char->int (read-char p))]
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[c3 (char->int (read-char p))])
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(cond
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[(fx<= c3 127)
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(fxlogor (fxlogor c0 (fxsll c1 8))
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(fxlogor (fxsll c2 16) (fxsll c3 24)))]
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[else
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(let ([c0 (fxlogand #xFF (fxlognot c0))]
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[c1 (fxlogand #xFF (fxlognot c1))]
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[c2 (fxlogand #xFF (fxlognot c2))]
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[c3 (fxlogand #xFF (fxlognot c3))])
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(fx- -1
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(fxlogor (fxlogor c0
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(fxsll c1 8))
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(fxlogor (fxsll c2 16)
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(fxsll c3 24)))))])))
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(define (do-read p)
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(define marks (make-vector 1 #f))
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(define (max x y)
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(if (fx> x y) x y))
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(define (put-mark m obj)
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(cond
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[(fx< m (vector-length marks))
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(when (vector-ref marks m)
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(die 'fasl-read "mark set twice" m))
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(vector-set! marks m obj)]
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[else
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(let ([n (vector-length marks)])
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(let ([v (make-vector
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(max (fx* n 2) (fx+ m 1))
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#f)])
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(let f ([i 0])
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(cond
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[(fx= i n)
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(set! marks v)
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(vector-set! marks m obj)]
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[else
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(vector-set! v i (vector-ref marks i))
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(f (fxadd1 i))]))))]))
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(define (read) (read/mark #f))
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(define (read-code code-m clos-m)
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(let* ([code-size (read-int p)]
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[freevars (read-fixnum p)])
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(let ([code (make-code code-size freevars)])
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(when code-m (put-mark code-m code))
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(let f ([i 0])
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(unless (fx= i code-size)
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(code-set! code i (char->int (read-char p)))
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(f (fxadd1 i))))
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(cond
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[clos-m
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(let ([clos ($code->closure code)])
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(put-mark clos-m clos)
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(set-code-reloc-vector! code (read))
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code)]
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[else
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(set-code-reloc-vector! code (read))
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code]))))
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(define (read-thunk m)
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(let ([c (read-char p)])
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(case c
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[(#\x)
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(let ([code (read-code #f m)])
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(if m (vector-ref marks m) ($code->closure code)))]
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[(#\<)
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(let ([cm (read-int p)])
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(unless (fx< cm (vector-length marks))
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(die who "invalid mark" m))
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(let ([code (vector-ref marks cm)])
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(let ([proc ($code->closure code)])
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(when m (put-mark m proc))
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proc)))]
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[(#\>)
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(let ([cm (read-int p)])
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(assert-eq? (read-char p) #\x)
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(let ([code (read-code cm m)])
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(if m (vector-ref marks m) ($code->closure code))))]
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[else (die who "invalid code header" c)])))
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(define (read/mark m)
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(define (nom)
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(when m (die who "unhandled mark")))
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(let ([h (read-char p)])
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(case h
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[(#\I)
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(nom)
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(read-fixnum p)]
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[(#\P)
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(if m
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(let ([x (cons #f #f)])
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(put-mark m x)
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(set-car! x (read))
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(set-cdr! x (read))
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x)
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(let ([a (read)])
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(cons a (read))))]
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[(#\N) '()]
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[(#\T) #t]
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[(#\F) #f]
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[(#\E) (eof-object)]
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[(#\U) (void)]
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[(#\S) ;;; string
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(let ([n (read-int p)])
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(let ([str (make-string n)])
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(let f ([i 0])
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(unless (fx= i n)
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(let ([c (read-char p)])
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(string-set! str i c)
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(f (fxadd1 i)))))
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(when m (put-mark m str))
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str))]
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[(#\M) ;;; symbol
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(let ([str (read)])
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(let ([sym (string->symbol str)])
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(when m (put-mark m sym))
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sym))]
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[(#\G)
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(let* ([pretty (read)]
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[unique (read)])
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(foreign-call "ikrt_strings_to_gensym" pretty unique))]
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[(#\V) ;;; vector
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(let ([n (read-int p)])
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(let ([v (make-vector n)])
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(when m (put-mark m v))
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(let f ([i 0])
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(unless (fx= i n)
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(vector-set! v i (read))
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(f (fxadd1 i))))
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v))]
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[(#\x) ;;; code
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(read-code m #f)]
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[(#\Q) ;;; thunk
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(read-thunk m)]
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[(#\R)
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(let* ([rtd-name (read)]
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[rtd-symbol (read)]
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[field-count (read-int p)])
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(let ([fields
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(let f ([i 0])
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(cond
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[(fx= i field-count) '()]
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[else
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(let ([a (read)])
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(cons a (f (fxadd1 i))))]))])
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(let ([rtd (make-struct-type
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rtd-name fields rtd-symbol)])
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(when m (put-mark m rtd))
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rtd)))]
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[(#\{)
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(let ([n (read-int p)])
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(let ([rtd (read)])
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(let ([x ($make-struct rtd n)])
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(when m (put-mark m x))
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(let f ([i 0])
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(unless (fx= i n)
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($struct-set! x i (read))
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(f (fxadd1 i))))
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x)))]
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[(#\C)
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(let ([c (read-char p)])
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(cond
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[(char? c) c]
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[else
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(die who "invalid eof inside a fasl object")]))]
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[(#\>)
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(let ([m (read-int p)])
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(read/mark m))]
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[(#\<)
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(let ([m (read-int p)])
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(unless (fx< m (vector-length marks))
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(die who "invalid mark" m))
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(vector-ref marks m))]
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[else
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(die who "Unexpected char as a fasl object header" h)])))
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(read))
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(define $fasl-read
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(lambda (p)
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(assert-eq? (read-char p) #\I)
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(assert-eq? (read-char p) #\K)
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(assert-eq? (read-char p) #\0)
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(assert-eq? (read-char p) #\1)
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(do-read p)))
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(define fasl-read
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(case-lambda
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[() ($fasl-read (current-input-port))]
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[(p)
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(if (input-port? p)
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($fasl-read p)
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(die 'fasl-read "not an input port" p))]))
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)
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