factor/library/inference/kill-literals.factor

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! Copyright (C) 2004, 2005 Slava Pestov.
! See http://factor.sf.net/license.txt for BSD license.
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IN: optimizer
USING: arrays generic hashtables inference kernel
namespaces sequences ;
: node-union ( node quot -- hash | quot: node -- seq )
#! Build a hash with equal keys/values, effectively taking
#! the set union over all return values of the quotation.
[
swap [ swap call [ dup set ] each ] each-node-with
] make-hash ; inline
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GENERIC: literals* ( node -- seq )
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: literals ( node -- hash )
[ literals* ] node-union ;
GENERIC: live-values* ( node -- seq )
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: live-values ( node -- hash )
#! All values that are returned or passed to calls.
[ live-values* ] node-union ;
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GENERIC: returns*
: returns ( node -- hash )
#! Trace all control flow paths, build a hash of
#! final #return nodes.
[ returns* ] node-union ;
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: kill-set ( node -- seq )
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#! Push a list of literals that may be killed in the IR.
dup live-values swap literals hash-diff hash-keys ;
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: remove-values ( values node -- )
2dup [ node-in-d remove-all ] keep set-node-in-d
2dup [ node-out-d remove-all ] keep set-node-out-d
2dup [ node-in-r remove-all ] keep set-node-in-r
[ node-out-r remove-all ] keep set-node-out-r ;
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: kill-node ( literals node -- )
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[ remove-values ] each-node-with ;
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! Generic nodes
M: node literals* ( node -- seq ) drop @{ }@ ;
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M: node live-values* ( node -- seq ) node-values ;
M: node returns* ( node -- seq ) drop @{ }@ ;
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! #shuffle
M: #shuffle literals* ( node -- seq )
node-out-d [ literal? ] subset ;
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! #return
M: #return returns* 1array ;
M: #return live-values* ( node -- seq )
#! Values returned by local labels can be killed.
dup node-param [ drop @{ }@ ] [ delegate live-values* ] ifte ;
! nodes that don't use their input values directly
UNION: #killable #shuffle #call-label #merge #entry #values ;
M: #killable live-values* ( node -- seq ) drop @{ }@ ;
! branching
UNION: #branch #ifte #dispatch ;
M: #branch live-values* ( node -- seq )
#! This assumes that the last element of each branch is a
#! #return node.
returns hash-keys [ node-in-d ] map unify-lengths flip
[ [ eq? ] monotonic? not ] subset concat ;