ikarus/scheme/ikarus.handlers.ss

130 lines
3.7 KiB
Scheme

;;; Ikarus Scheme -- A compiler for R6RS Scheme.
;;; Copyright (C) 2006,2007 Abdulaziz Ghuloum
;;;
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License version 3 as
;;; published by the Free Software Foundation.
;;;
;;; This program is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
(library (ikarus system parameters)
(export make-parameter)
(import (except (ikarus) make-parameter))
(define make-parameter
(case-lambda
[(x)
(case-lambda
[() x]
[(v) (set! x v)])]
[(x guard)
(unless (procedure? guard)
(error 'make-parameter "not a procedure" guard))
(set! x (guard x))
(case-lambda
[() x]
[(v) (set! x (guard v))])])))
(library (ikarus system handlers)
(export
interrupt-handler $apply-nonprocedure-error-handler
$incorrect-args-error-handler $multiple-values-error $debug
$underflow-misaligned-error top-level-value-error car-error
cdr-error fxadd1-error fxsub1-error cadr-error fx+-type-error
fx+-types-error fx+-overflow-error $do-event)
(import (except (ikarus) interrupt-handler)
(only (ikarus system $interrupts) $interrupted? $unset-interrupted!))
(define interrupt-handler
(make-parameter
(lambda ()
(set-port-output-index! (console-output-port) 0)
(error #f "interrupted"))
(lambda (x)
(if (procedure? x)
x
(error 'interrupt-handler "not a procedure" x)))))
(define $apply-nonprocedure-error-handler
(lambda (x)
(error 'apply "not a procedure" x)))
(define $incorrect-args-error-handler
(lambda (p n)
(error 'apply "incorrect number of arguments" n p)))
(define $multiple-values-error
(lambda args
(error 'apply
"incorrect number of values returned to single value context"
args)))
(define $debug
(lambda (x)
(foreign-call "ik_error" (cons "DEBUG" x))))
(define $underflow-misaligned-error
(lambda ()
(foreign-call "ik_error" "misaligned")))
(define top-level-value-error
(lambda (x)
(cond
[(symbol? x)
(if (symbol-bound? x)
(error 'top-level-value-error "BUG: should not happen" x)
(error #f "unbound" (string->symbol (symbol->string x))))]
[else
(error 'top-level-value "not a symbol" x)])))
(define car-error
(lambda (x)
(error 'car "not a pair" x)))
(define cdr-error
(lambda (x)
(error 'cdr "not a pair" x)))
(define fxadd1-error
(lambda (x)
(if (fixnum? x)
(error 'fxadd1 "overflow")
(error 'fxadd1 "not a fixnum" x))))
(define fxsub1-error
(lambda (x)
(if (fixnum? x)
(error 'fxsub1 "underflow")
(error 'fxsub1 "not a fixnum" x))))
(define cadr-error
(lambda (x)
(error 'cadr "invalid list structure" x)))
(define fx+-type-error
(lambda (x)
(error 'fx+ "not a fixnum" x)))
(define fx+-types-error
(lambda (x y)
(error 'fx+ "not a fixnum"
(if (fixnum? x) y x))))
(define fx+-overflow-error
(lambda (x y)
(error 'fx+ "overflow")))
(define $do-event
(lambda ()
(when ($interrupted?)
($unset-interrupted!)
((interrupt-handler)))))
)