! :folding=none:collapseFolds=1:

! $Id$
!
! Copyright (C) 2004 Slava Pestov.
! 
! Redistribution and use in source and binary forms, with or without
! modification, are permitted provided that the following conditions are met:
! 
! 1. Redistributions of source code must retain the above copyright notice,
!    this list of conditions and the following disclaimer.
! 
! 2. Redistributions in binary form must reproduce the above copyright notice,
!    this list of conditions and the following disclaimer in the documentation
!    and/or other materials provided with the distribution.
! 
! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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IN: vectors
DEFER: vector=
DEFER: vector-hashcode

IN: kernel
USE: lists
USE: math
USE: math-internals
USE: strings
USE: vectors
USE: words
USE: vectors

: cpu ( -- arch )
    #! Returns one of "x86" or "unknown".
    7 getenv ;

! The 'fake vtable' used here speeds things up a lot.
! It is quite clumsy, however. A higher-level CLOS-style
! 'generic words' system will be built later.

: generic ( obj vtable -- )
    >r dup type r> vector-nth execute ;

: 2generic ( n n vtable -- )
    >r 2dup arithmetic-type r> vector-nth execute ;

: default-hashcode drop 0 ;

: hashcode ( obj -- hash )
    #! If two objects are =, they must have equal hashcodes.
    {
        nop                ! 0
        word-hashcode      ! 1
        cons-hashcode      ! 2
        default-hashcode   ! 3
        >fixnum            ! 4
        >fixnum            ! 5
        default-hashcode   ! 6
        default-hashcode   ! 7
        default-hashcode   ! 8
        >fixnum            ! 9 
        >fixnum            ! 10
        vector-hashcode    ! 11
        str-hashcode       ! 12
        sbuf-hashcode      ! 13
        default-hashcode   ! 14
        default-hashcode   ! 15
        default-hashcode   ! 16
    } generic ;

IN: math DEFER: number= ( defined later... )
IN: kernel
: = ( obj obj -- ? )
    #! Push t if a is isomorphic to b.
    {
        number= ! 0
        eq?     ! 1
        cons=   ! 2
        eq?     ! 3
        number= ! 4
        number= ! 5
        eq?     ! 6
        eq?     ! 7
        eq?     ! 8
        number= ! 9 
        number= ! 10
        vector= ! 11
        str=    ! 12
        sbuf=   ! 13
        eq?     ! 14
        eq?     ! 15 
        eq?     ! 16
    } generic ; 

: 2= ( a b c d -- ? )
    #! Test if a = c, b = d.
    rot = [ = ] [ 2drop f ] ifte ;

: set-boot ( quot -- )
    #! Set the boot quotation.
    8 setenv ;