87 lines
2.3 KiB
Factor
87 lines
2.3 KiB
Factor
! Copyright (C) 2004, 2006 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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IN: inference
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USING: arrays errors generic hashtables kernel math
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namespaces parser prettyprint sequences strings vectors words ;
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: unify-lengths ( seq -- newseq )
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dup [ length ] map supremum
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swap [ add-inputs nip ] map-with ;
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: unify-values ( seq -- value )
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dup all-eq? [ first ] [ drop <computed> ] if ;
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: unify-stacks ( seq -- stack ) flip [ unify-values ] map ;
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: balanced? ( in out -- ? )
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[ dup [ length - ] [ 2drop f ] if ] 2map
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[ ] subset all-equal? ;
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TUPLE: unbalanced-branches-error in out ;
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: unbalanced-branches-error ( in out -- * )
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<unbalanced-branches-error> inference-error ;
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: unify-inputs ( max-d-in d-in meta-d -- meta-d )
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dup [
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[ >r - r> length + ] keep add-inputs nip
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] [
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2nip
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] if ;
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: unify-effect ( in out -- newin newout )
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#! in is a sequence of integers, out is a sequence of
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#! stacks.
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2dup balanced? [
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over supremum -rot
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[ >r dupd r> unify-inputs ] 2map
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[ ] subset unify-stacks
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] [
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unbalanced-branches-error
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] if ;
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: active-variable ( seq symbol -- seq )
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swap [
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terminated? over hash [ 2drop f ] [ hash ] if
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] map-with ;
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: datastack-effect ( seq -- )
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d-in over [ hash ] map-with
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swap meta-d active-variable
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unify-effect meta-d set d-in set ;
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: callstack-effect ( seq -- )
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dup length 0 <array>
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swap meta-r active-variable
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unify-effect meta-r set drop ;
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: unify-effects ( seq -- )
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dup datastack-effect dup callstack-effect
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[ terminated? swap hash ] all? terminated? set ;
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: unify-dataflow ( effects -- nodes )
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[ dataflow-graph swap hash ] map ;
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: copy-inference ( -- )
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meta-r [ clone ] change
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meta-d [ clone ] change
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d-in [ ] change
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dataflow-graph off
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current-node off ;
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: infer-branch ( value -- namespace )
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[
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copy-inference
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dup value-recursion recursive-state set
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value-literal infer-quot
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terminated? get [ #values node, ] unless
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] make-hash ;
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: (infer-branches) ( branchlist -- list )
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[ infer-branch ] map dup unify-effects unify-dataflow ;
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: infer-branches ( branches node -- )
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dup node,
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>r (infer-branches) r> set-node-children
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#merge node, ;
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