65 lines
2.2 KiB
Factor
65 lines
2.2 KiB
Factor
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! :folding=indent:collapseFolds=1:
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! $Id$
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!
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! Copyright (C) 2004 Slava Pestov.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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IN: compiler
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USE: combinators
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USE: words
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USE: stack
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USE: kernel
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USE: math
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USE: lists
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: compile-f-test ( -- fixup )
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#! Push addr where we write the branch target address.
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POP-DS
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! ptr to condition is now in EAX
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f address EAX CMP-I-[R]
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! jump w/ address added later
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JE ;
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: branch-target ( fixup -- )
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compiled-offset swap JUMP-FIXUP ;
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: compile-else ( fixup -- fixup )
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#! Push addr where we write the branch target address,
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#! and fixup branch target address from compile-f-test.
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#! Push f for the fixup if we're tail position.
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tail? [ RET f ] [ JUMP ] ifte swap branch-target ;
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: end-if ( fixup -- )
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tail? [ drop RET ] [ branch-target ] ifte ;
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: compile-ifte ( compile-time: true false -- )
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pop-literal pop-literal commit-literals
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compile-f-test >r
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( t -- ) compile-quot
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r> compile-else >r
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( f -- ) compile-quot
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r> end-if ;
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[ compile-ifte ] \ ifte "compiling" set-word-property
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