55 lines
1.3 KiB
Factor
55 lines
1.3 KiB
Factor
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: assocs arrays namespaces sequences kernel definitions
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math effects accessors words fry classes.algebra
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compiler.units ;
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IN: stack-checker.state
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! Did the current control-flow path throw an error?
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SYMBOL: terminated?
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! Number of inputs current word expects from the stack
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SYMBOL: d-in
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! Compile-time data stack
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SYMBOL: meta-d
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! Compile-time retain stack
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SYMBOL: meta-r
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: current-stack-height ( -- n ) meta-d get length d-in get - ;
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: current-effect ( -- effect )
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d-in get
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meta-d get length <effect>
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terminated? get >>terminated? ;
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: init-inference ( -- )
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terminated? off
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V{ } clone meta-d set
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V{ } clone meta-r set
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0 d-in set ;
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! Words that the current quotation depends on
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SYMBOL: dependencies
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: depends-on ( word how -- )
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over primitive? [ 2drop ] [
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dependencies get dup [
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swap '[ _ strongest-dependency ] change-at
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] [ 3drop ] if
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] if ;
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! Generic words that the current quotation depends on
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SYMBOL: generic-dependencies
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: ?class-or ( class/f class -- class' )
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swap [ class-or ] when* ;
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: depends-on-generic ( generic class -- )
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generic-dependencies get dup
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[ swap '[ _ ?class-or ] change-at ] [ 3drop ] if ;
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! Words we've inferred the stack effect of, for rollback
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SYMBOL: recorded
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