108 lines
3.0 KiB
Factor
Executable File
108 lines
3.0 KiB
Factor
Executable File
! Copyright (C) 2007, 2009 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: arrays byte-arrays byte-vectors generic assocs hashtables
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io.binary kernel kernel.private math namespaces make sequences
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words quotations strings alien.accessors alien.strings layouts
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system combinators math.bitwise math.order
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accessors growable compiler.constants ;
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IN: compiler.codegen.fixup
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! Literal table
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SYMBOL: literal-table
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: add-literal ( obj -- ) literal-table get push ;
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! Labels
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SYMBOL: label-table
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TUPLE: label offset ;
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: <label> ( -- label ) label new ;
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: define-label ( name -- ) <label> swap set ;
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: compiled-offset ( -- n ) building get length ;
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: resolve-label ( label/name -- )
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dup label? [ get ] unless
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compiled-offset >>offset drop ;
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: offset-for-class ( class -- n )
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rc-absolute-cell = cell 4 ? compiled-offset swap - ;
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TUPLE: label-fixup { label label } { class integer } { offset integer } ;
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: label-fixup ( label class -- )
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dup offset-for-class \ label-fixup boa label-table get push ;
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! Relocation table
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SYMBOL: relocation-table
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: push-4 ( value vector -- )
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[ length ] [ B{ 0 0 0 0 } swap push-all ] [ underlying>> ] tri
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swap set-alien-unsigned-4 ;
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: add-relocation-entry ( type class offset -- )
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{ 0 24 28 } bitfield relocation-table get push-4 ;
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: rel-fixup ( class type -- )
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swap dup offset-for-class add-relocation-entry ;
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: add-dlsym-literals ( symbol dll -- )
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[ string>symbol add-literal ] [ add-literal ] bi* ;
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: rel-dlsym ( name dll class -- )
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[ add-dlsym-literals ] dip rt-dlsym rel-fixup ;
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: rel-word ( word class -- )
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[ add-literal ] dip rt-xt rel-fixup ;
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: rel-word-pic ( word class -- )
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[ add-literal ] dip rt-xt-pic rel-fixup ;
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: rel-word-pic-tail ( word class -- )
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[ add-literal ] dip rt-xt-pic-tail rel-fixup ;
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: rel-primitive ( word class -- )
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[ def>> first add-literal ] dip rt-primitive rel-fixup ;
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: rel-immediate ( literal class -- )
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[ add-literal ] dip rt-immediate rel-fixup ;
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: rel-this ( class -- )
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rt-this rel-fixup ;
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: rel-here ( offset class -- )
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[ add-literal ] dip rt-here rel-fixup ;
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! And the rest
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: resolve-offset ( label-fixup -- offset )
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label>> offset>> [ "Unresolved label" throw ] unless* ;
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: resolve-absolute-label ( label-fixup -- )
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dup resolve-offset neg add-literal
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[ rt-here ] dip [ class>> ] [ offset>> ] bi add-relocation-entry ;
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: resolve-relative-label ( label-fixup -- label )
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[ class>> ] [ offset>> ] [ resolve-offset ] tri 3array ;
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: resolve-labels ( label-fixups -- labels' )
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[ class>> rc-absolute? ] partition
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[ [ resolve-absolute-label ] each ]
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[ [ resolve-relative-label ] map concat ]
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bi* ;
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: init-fixup ( -- )
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V{ } clone literal-table set
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V{ } clone label-table set
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BV{ } clone relocation-table set ;
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: with-fixup ( quot -- code )
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[
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init-fixup
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call
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label-table [ resolve-labels ] change
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literal-table get >array
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relocation-table get >byte-array
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label-table get
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] B{ } make 4array ; inline
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