75 lines
2.0 KiB
Factor
75 lines
2.0 KiB
Factor
! Copyright (C) 2004, 2005 Slava Pestov.
|
|
! See http://factor.sf.net/license.txt for BSD license.
|
|
IN: optimizer
|
|
USING: arrays generic hashtables inference kernel math
|
|
namespaces sequences words ;
|
|
|
|
: node-union ( node quot -- hash )
|
|
[
|
|
swap [ swap call [ dup set ] each ] each-node-with
|
|
] make-hash ; inline
|
|
|
|
GENERIC: literals* ( node -- seq )
|
|
|
|
: literals ( node -- hash )
|
|
[ literals* ] node-union ;
|
|
|
|
GENERIC: live-values* ( node -- seq )
|
|
|
|
: live-values ( node -- hash )
|
|
#! All values that are returned or passed to calls.
|
|
[ live-values* ] node-union ;
|
|
|
|
: kill-node* ( 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 ;
|
|
|
|
: kill-node ( values node -- )
|
|
over hash-empty?
|
|
[ 2drop ] [ [ kill-node* ] each-node-with ] if ;
|
|
|
|
: kill-values ( node -- )
|
|
dup live-values over literals hash-diff swap kill-node ;
|
|
|
|
! Generic nodes
|
|
M: node literals* drop { } ;
|
|
|
|
M: node live-values*
|
|
node-in-d [ value? ] subset ;
|
|
|
|
! #push
|
|
M: #push literals* node-out-d ;
|
|
|
|
! #return
|
|
M: #return live-values*
|
|
#! Values returned by local labels can be killed.
|
|
dup node-param [ drop { } ] [ delegate live-values* ] if ;
|
|
|
|
! nodes that don't use their values directly
|
|
UNION: #killable
|
|
#push #shuffle #call-label #merge #values #entry ;
|
|
|
|
M: #killable live-values* drop { } ;
|
|
|
|
: purge-invariants ( stacks -- seq )
|
|
#! Output a sequence of values which are not present in the
|
|
#! same position in each sequence of the stacks sequence.
|
|
unify-lengths flip [ all-eq? not ] subset concat ;
|
|
|
|
! #label
|
|
M: #label live-values*
|
|
dup node-child node-in-d over node-in-d 2array
|
|
swap collect-recursion append purge-invariants ;
|
|
|
|
! branching
|
|
UNION: #branch #if #dispatch ;
|
|
|
|
M: #branch live-values*
|
|
#! This assumes that the last element of each branch is a
|
|
#! #return node.
|
|
dup delegate live-values* >r
|
|
node-children [ last-node node-in-d ] map purge-invariants
|
|
r> append ;
|