35 lines
659 B
Factor
35 lines
659 B
Factor
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! Copyright (C) 2007 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: namespaces math words kernel assocs system classes ;
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IN: layouts
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SYMBOL: tag-mask
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SYMBOL: num-tags
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SYMBOL: tag-bits
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SYMBOL: num-types
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SYMBOL: tag-numbers
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SYMBOL: type-numbers
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: tag-number ( class -- n )
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tag-numbers get at [ object tag-number ] unless* ;
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: type-number ( class -- n )
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type-numbers get at ;
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: tag-header ( n -- tagged )
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tag-bits get shift ;
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: first-bignum ( -- n )
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bootstrap-cell-bits tag-bits get - 1 - 2^ ;
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: most-positive-fixnum ( -- n )
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first-bignum 1- ;
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: most-negative-fixnum ( -- n )
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first-bignum neg ;
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