1 ! Copyright (C) 2008 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: arrays namespaces sequences kernel generic assocs
4 classes vectors accessors combinators sets
8 compiler.tree.combinators ;
9 IN: compiler.tree.def-use
13 TUPLE: definition value node uses ;
15 : <definition> ( node value -- definition )
21 ERROR: no-def-error value ;
23 : def-of ( value -- definition )
24 def-use get ?at [ no-def-error ] unless ;
26 ERROR: multiple-defs-error ;
28 : def-value ( node value -- )
29 def-use get 2dup key? [
32 [ [ <definition> ] keep ] dip set-at
35 : used-by ( value -- nodes ) def-of uses>> ;
37 : use-value ( node value -- ) used-by push ;
39 : defined-by ( value -- node ) def-of node>> ;
41 GENERIC: node-uses-values ( node -- values )
43 M: #introduce node-uses-values drop f ;
44 M: #push node-uses-values drop f ;
45 M: #phi node-uses-values phi-in-d>> concat remove-bottom prune ;
46 M: #declare node-uses-values drop f ;
47 M: #terminate node-uses-values [ in-d>> ] [ in-r>> ] bi append ;
48 M: #shuffle node-uses-values [ in-d>> ] [ in-r>> ] bi append ;
49 M: #alien-callback node-uses-values drop f ;
50 M: node node-uses-values in-d>> ;
52 GENERIC: node-defs-values ( node -- values )
54 M: #shuffle node-defs-values [ out-d>> ] [ out-r>> ] bi append ;
55 M: #branch node-defs-values drop f ;
56 M: #declare node-defs-values drop f ;
57 M: #return node-defs-values drop f ;
58 M: #recursive node-defs-values drop f ;
59 M: #terminate node-defs-values drop f ;
60 M: #alien-callback node-defs-values drop f ;
61 M: node node-defs-values out-d>> ;
63 : node-def-use ( node -- )
64 [ dup node-uses-values [ use-value ] with each ]
65 [ dup node-defs-values [ def-value ] with each ] bi ;
67 : compute-def-use ( node -- node )
68 H{ } clone def-use set
69 dup [ node-def-use ] each-node ;