89 lines
2.9 KiB
Factor
89 lines
2.9 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: linearizer
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USE: lists
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USE: words
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USE: stack
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USE: namespaces
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USE: dataflow
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USE: combinators
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! Linear IR nodes. This is in addition to the symbols already
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! defined in dataflow vocab.
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SYMBOL: #branch-t ( branch if top of stack is true )
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SYMBOL: #branch ( unconditional branch )
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SYMBOL: #label ( branch target )
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SYMBOL: #jump ( tail-call )
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SYMBOL: #return ( return to caller )
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: linear, ( param op -- )
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swons , ;
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: >linear ( node -- )
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#! Dataflow OPs have a linearizer word property. This
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#! quotation is executed to convert the node into linear
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#! form.
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[ node-param get node-op get ] bind
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dup "linearizer" word-property dup [
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nip call
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] [
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drop linear,
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] ifte ;
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: (linearize) ( dataflow -- )
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[ >linear ] each ;
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: linearize ( dataflow -- linear )
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#! Transform dataflow IR into linear IR. This strips out
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#! stack flow information, flattens conditionals into
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#! jumps and labels, and turns dataflow IR nodes into
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#! lists where the first element is an operation, and the
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#! rest is arguments.
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[ (linearize) f #return linear, ] make-list ;
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: <label> ( -- label )
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gensym ;
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: label, ( label -- )
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#label linear, ;
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: linearize-ifte ( param -- )
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#! The parameter is a list of two lists, each one a dataflow
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#! IR.
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uncons car
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<label> [
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#branch-t linear,
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(linearize) ( false branch )
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<label> dup #branch linear,
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] keep label, ( branch target of BRANCH-T )
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swap (linearize) ( true branch )
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label, ( branch target of false branch end ) ;
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\ #ifte [ linearize-ifte ] "linearizer" set-word-property
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