42 lines
1.1 KiB
Scheme
42 lines
1.1 KiB
Scheme
; Copyright (c) 1993, 1994 Richard Kelsey and Jonathan Rees. See file COPYING.
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(define (describe x)
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(if (and (stob? x)
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(< (stob-type x) least-b-vector-type))
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(let ((tag (string-append (number->string x) ": "))
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(len (bytes->cells (stob-length-in-bytes x))))
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(do ((i -1 (+ i 1)))
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((= i len))
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(describe-1 (stob-ref x i) tag)))
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(describe-1 x "")))
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(define (describe-1 x addr)
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(cond ((fixnum? x) (display " fixnum ") (write (extract-fixnum x)))
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((header? x)
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(display addr)
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(if (immutable-header? x)
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(display " immutable"))
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(display " header ")
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(let ((type (header-type x)))
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(if (< type stob-count)
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(write (vector-ref stob type))
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(write type)))
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(display " ")
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(write (header-length-in-bytes x)))
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((immediate? x)
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(cond (else
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(display " immediate ")
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(let ((type (immediate-type x)))
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(if (< type imm-count)
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(write (vector-ref imm type))
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(write type)))
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(display " ")
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(write (immediate-info x)))))
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((stob? x)
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(display " stob ") (write x))
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(else (display " ? ") (write x)))
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(newline))
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