1 ! Copyright (C) 2011 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs bit-arrays classes.tuple
4 compiler.codegen.relocation cpu.architecture fry kernel layouts make math
5 math.order namespaces sequences ;
6 IN: compiler.codegen.gc-maps
8 SYMBOLS: return-addresses gc-maps ;
10 : gc-map-needed? ( gc-map/f -- ? )
11 dup [ tuple-slots [ empty? ] all? not ] when ;
13 : gc-map-here ( gc-map -- )
16 compiled-offset return-addresses get push
19 : integers>bits ( seq n -- bit-array )
20 <bit-array> [ '[ [ t ] dip _ set-nth ] each ] keep ;
22 : largest-spill-slot ( seqs -- n )
23 concat [ 0 ] [ supremum 1 + ] if-empty ;
25 : emit-gc-roots ( seqs -- n )
26 ! seqs is a sequence of sequences of integers 0..n-1
27 dup largest-spill-slot [ '[ _ integers>bits % ] each ] keep ;
30 building get push-uint ;
35 : gc-root-offsets ( gc-map -- offsets )
36 gc-roots>> [ gc-root-offset ] map ;
38 : emit-gc-info-bitmap ( gc-maps -- spill-count )
39 [ gc-root-offsets ] map
40 [ emit-gc-roots ] ?{ } make underlying>> % ;
42 : emit-base-table ( alist longest -- )
43 -1 <array> <enumerated> swap assoc-union! seq>> emit-uints ;
45 : derived-root-offsets ( gc-map -- offsets )
46 derived-roots>> [ [ gc-root-offset ] bi@ ] assoc-map ;
48 : emit-base-tables ( gc-maps -- count )
49 [ derived-root-offsets ] map
50 dup [ keys ] map largest-spill-slot
51 [ '[ _ emit-base-table ] each ] keep ;
53 : serialize-gc-maps ( -- byte-array )
55 return-addresses get empty? [ { } ] [
56 gc-maps get [ emit-gc-info-bitmap ] [ emit-base-tables ] bi 2array
58 return-addresses get emit-uints
60 return-addresses get length emit-uint
65 length compiled-offset +
66 [ data-alignment get align ] keep -