35 lines
1.2 KiB
Scheme
35 lines
1.2 KiB
Scheme
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; Copyright (c) 1993-1999 by Richard Kelsey and Jonathan Rees. See file COPYING.
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; Hairier exceptions & interrupts.
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; Enable generic arithmetic, informative error messages, etc.
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; Deal with optional arguments, etc. to primitives.
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; This is not necessarily the cleanest way to do this, and certainly not
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; the most efficient, but for the time being it's the most expedient.
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; We don't want to depend on tables. But if we did, we might do this:
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;(define (closure-hash closure)
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; (let ((cv (vector-ref (closure-template closure) 0))) ;template-ref
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; (do ((h 0 (+ h (code-vector-ref cv i)))
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; (i (- (code-vector-length cv) 1) (- i 1)))
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; ((< i 0) h))))
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;(define wna-handlers (make-table closure-hash))
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;(define-exception-handler (enum op check-nargs=)
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; (lambda (opcode reason proc args)
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; (let ((probe (assq proc *wna-handlers*)))
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; (if probe
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; ((cdr probe) args)
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; (signal-exception opcode reason proc args)))))
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(define *wna-handlers* '())
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(define (define-wna-handler proc handler)
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(set! *wna-handlers* (cons (cons proc handler) *wna-handlers*)))
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(define op/check-nargs= (enum op protocol)) ; temporary hack
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(define (wna-lose proc args)
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(signal-exception op/check-nargs= #f proc args)) ; lost our reason
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