52 lines
1.4 KiB
Factor
52 lines
1.4 KiB
Factor
! Copyright (C) 2008, 2010 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 stack-checker.values stack-checker.visitor
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stack-checker.errors ;
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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: input-count
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SYMBOL: inner-d-index
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DEFER: commit-literals
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! Compile-time data stack
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: meta-d ( -- stack ) commit-literals \ meta-d get ;
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! Compile-time retain stack
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: meta-r ( -- stack ) \ meta-r get ;
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! Uncommitted literals. This is a form of local dead-code
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! elimination; the goal is to reduce the number of IR nodes
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! which get constructed. Technically it is redundant since
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! we do global DCE later, but it speeds up compile time.
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SYMBOL: literals
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: (push-literal) ( obj -- )
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dup <literal> make-known
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[ nip \ meta-d get push ] [ #push, ] 2bi ;
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: commit-literals ( -- )
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literals get [
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[ [ (push-literal) ] each ] [ delete-all ] bi
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] unless-empty ;
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: current-stack-height ( -- n ) meta-d length input-count get - ;
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: current-effect ( -- effect )
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input-count get "x" <array>
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meta-d length "x" <array>
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terminated? get <terminated-effect> ;
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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 literals set
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0 input-count set
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0 inner-d-index set ;
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