! :folding=indent:collapseFolds=1:

! $Id$
!
! Copyright (C) 2004 Slava Pestov.
! 
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! modification, are permitted provided that the following conditions are met:
! 
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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IN: compiler
USE: math
USE: stack
USE: lists
USE: combinators
USE: words
USE: namespaces
USE: unparser
USE: errors
USE: strings
USE: logic
USE: kernel
USE: vectors

: compile-word ( word -- )
    #! Compile a JMP at the end (tail call optimization)
    word-xt "compile-last" get [ JMP ] [ CALL ] ifte ;

: compile-literal ( obj -- )
    dup fixnum? [
        address-of LITERAL
    ] [
        intern-literal [LITERAL]
    ] ifte ;

: commit-literals ( -- )
    "compile-datastack" get dup [ compile-literal ] vector-each
    0 swap set-vector-length ;

: postpone ( obj -- )
    "compile-datastack" get vector-push ;

: compile-atom ( obj -- )
    [
        [ word? ] [ commit-literals compile-word ]
        [ drop t ] [ postpone ]
    ] cond ;

: compile-loop ( quot -- )
    dup [
        unswons
        over not "compile-last" set
        compile-atom
        compile-loop
    ] [
        commit-literals drop RET
    ] ifte ;

: compile-quot ( quot -- xt )
    [
        "compile-last" off
        10 <vector> "compile-datastack" set
        compiled-offset swap compile-loop
    ] with-scope ;

: compile ( word -- )
    intern dup word-parameter compile-quot swap set-word-xt ;

: call-xt ( xt -- )
    #! For testing.
    0 f f <word> [ set-word-xt ] keep execute ;