author | haftmann |
Tue, 19 Sep 2006 15:22:05 +0200 | |
changeset 20597 | 65fe827aa595 |
parent 19788 | be3a84d22a58 |
child 20680 | fd92d9310128 |
permissions | -rw-r--r-- |
12447 | 1 |
(* Title: HOL/recfun_codegen.ML |
2 |
ID: $Id$ |
|
3 |
Author: Stefan Berghofer, TU Muenchen |
|
4 |
||
5 |
Code generator for recursive functions. |
|
6 |
*) |
|
7 |
||
8 |
signature RECFUN_CODEGEN = |
|
9 |
sig |
|
18728 | 10 |
val add: string option -> attribute |
11 |
val del: attribute |
|
18708 | 12 |
val setup: theory -> theory |
12447 | 13 |
end; |
14 |
||
15 |
structure RecfunCodegen : RECFUN_CODEGEN = |
|
16 |
struct |
|
17 |
||
18 |
open Codegen; |
|
19 |
||
20597 | 20 |
structure RecCodegenData = TheoryDataFun |
16424 | 21 |
(struct |
12447 | 22 |
val name = "HOL/recfun_codegen"; |
16645 | 23 |
type T = (thm * string option) list Symtab.table; |
12447 | 24 |
val empty = Symtab.empty; |
25 |
val copy = I; |
|
16424 | 26 |
val extend = I; |
18931 | 27 |
fun merge _ = Symtab.merge_list (Drule.eq_thm_prop o pairself fst); |
12447 | 28 |
fun print _ _ = (); |
16424 | 29 |
end); |
12447 | 30 |
|
31 |
||
32 |
val dest_eqn = HOLogic.dest_eq o HOLogic.dest_Trueprop; |
|
15321
694f9d3ce90d
Reimplemented some operations on "code lemma" table to avoid that code
berghofe
parents:
15257
diff
changeset
|
33 |
val lhs_of = fst o dest_eqn o prop_of; |
12447 | 34 |
val const_of = dest_Const o head_of o fst o dest_eqn; |
35 |
||
36 |
fun warn thm = warning ("RecfunCodegen: Not a proper equation:\n" ^ |
|
37 |
string_of_thm thm); |
|
38 |
||
19344 | 39 |
fun add optmod = Thm.declaration_attribute (fn thm => Context.map_theory |
12447 | 40 |
let |
19344 | 41 |
fun add thm = |
42 |
if Pattern.pattern (lhs_of thm) then |
|
20597 | 43 |
RecCodegenData.map |
19344 | 44 |
(Symtab.update_list ((fst o const_of o prop_of) thm, (thm, optmod))) |
45 |
else tap (fn _ => warn thm) |
|
46 |
handle TERM _ => tap (fn _ => warn thm); |
|
15321
694f9d3ce90d
Reimplemented some operations on "code lemma" table to avoid that code
berghofe
parents:
15257
diff
changeset
|
47 |
in |
19344 | 48 |
add thm |
20597 | 49 |
#> CodegenData.add_func thm |
19344 | 50 |
end); |
12447 | 51 |
|
19344 | 52 |
fun del_thm thm thy = |
14196 | 53 |
let |
20597 | 54 |
val tab = RecCodegenData.get thy; |
14196 | 55 |
val (s, _) = const_of (prop_of thm); |
17412 | 56 |
in case Symtab.lookup tab s of |
18728 | 57 |
NONE => thy |
58 |
| SOME thms => |
|
20597 | 59 |
RecCodegenData.put (Symtab.update (s, gen_rem (eq_thm o apfst fst) (thms, thm)) tab) thy |
19344 | 60 |
end handle TERM _ => (warn thm; thy); |
61 |
||
62 |
val del = Thm.declaration_attribute |
|
20597 | 63 |
(fn thm => Context.map_theory (del_thm thm #> CodegenData.del_func thm)) |
14196 | 64 |
|
15321
694f9d3ce90d
Reimplemented some operations on "code lemma" table to avoid that code
berghofe
parents:
15257
diff
changeset
|
65 |
fun del_redundant thy eqs [] = eqs |
694f9d3ce90d
Reimplemented some operations on "code lemma" table to avoid that code
berghofe
parents:
15257
diff
changeset
|
66 |
| del_redundant thy eqs (eq :: eqs') = |
694f9d3ce90d
Reimplemented some operations on "code lemma" table to avoid that code
berghofe
parents:
15257
diff
changeset
|
67 |
let |
694f9d3ce90d
Reimplemented some operations on "code lemma" table to avoid that code
berghofe
parents:
15257
diff
changeset
|
68 |
val matches = curry |
17203 | 69 |
(Pattern.matches thy o pairself (lhs_of o fst)) |
15321
694f9d3ce90d
Reimplemented some operations on "code lemma" table to avoid that code
berghofe
parents:
15257
diff
changeset
|
70 |
in del_redundant thy (eq :: eqs) (filter_out (matches eq) eqs') end; |
694f9d3ce90d
Reimplemented some operations on "code lemma" table to avoid that code
berghofe
parents:
15257
diff
changeset
|
71 |
|
16645 | 72 |
fun get_equations thy defs (s, T) = |
20597 | 73 |
(case Symtab.lookup (RecCodegenData.get thy) s of |
16645 | 74 |
NONE => ([], "") |
75 |
| SOME thms => |
|
76 |
let val thms' = del_redundant thy [] |
|
77 |
(List.filter (fn (thm, _) => is_instance thy T |
|
78 |
(snd (const_of (prop_of thm)))) thms) |
|
79 |
in if null thms' then ([], "") |
|
80 |
else (preprocess thy (map fst thms'), |
|
81 |
case snd (snd (split_last thms')) of |
|
82 |
NONE => (case get_defn thy defs s T of |
|
83 |
NONE => thyname_of_const s thy |
|
84 |
| SOME ((_, (thyname, _)), _) => thyname) |
|
85 |
| SOME thyname => thyname) |
|
86 |
end); |
|
12447 | 87 |
|
16645 | 88 |
fun mk_suffix thy defs (s, T) = (case get_defn thy defs s T of |
17144 | 89 |
SOME (_, SOME i) => " def" ^ string_of_int i | _ => ""); |
12447 | 90 |
|
91 |
exception EQN of string * typ * string; |
|
92 |
||
93 |
fun cycle g (xs, x) = |
|
94 |
if x mem xs then xs |
|
19575
2d9940cd52d3
replaced Graph.find_paths by Graph.irreducible_paths;
wenzelm
parents:
19344
diff
changeset
|
95 |
else Library.foldl (cycle g) (x :: xs, List.concat (Graph.irreducible_paths (fst g) (x, x))); |
12447 | 96 |
|
17144 | 97 |
fun add_rec_funs thy defs gr dep eqs module = |
12447 | 98 |
let |
16645 | 99 |
fun dest_eq t = (fst (const_of t) ^ mk_suffix thy defs (const_of t), |
100 |
dest_eqn (rename_term t)); |
|
12447 | 101 |
val eqs' = map dest_eq eqs; |
102 |
val (dname, _) :: _ = eqs'; |
|
103 |
val (s, T) = const_of (hd eqs); |
|
104 |
||
17144 | 105 |
fun mk_fundef module fname prfx gr [] = (gr, []) |
106 |
| mk_fundef module fname prfx gr ((fname', (lhs, rhs)) :: xs) = |
|
12447 | 107 |
let |
17144 | 108 |
val (gr1, pl) = invoke_codegen thy defs dname module false (gr, lhs); |
109 |
val (gr2, pr) = invoke_codegen thy defs dname module false (gr1, rhs); |
|
110 |
val (gr3, rest) = mk_fundef module fname' "and " gr2 xs |
|
12447 | 111 |
in |
112 |
(gr3, Pretty.blk (4, [Pretty.str (if fname = fname' then " | " else prfx), |
|
113 |
pl, Pretty.str " =", Pretty.brk 1, pr]) :: rest) |
|
114 |
end; |
|
115 |
||
17144 | 116 |
fun put_code module fundef = map_node dname |
117 |
(K (SOME (EQN ("", dummyT, dname)), module, Pretty.string_of (Pretty.blk (0, |
|
12447 | 118 |
separate Pretty.fbrk fundef @ [Pretty.str ";"])) ^ "\n\n")); |
119 |
||
120 |
in |
|
17144 | 121 |
(case try (get_node gr) dname of |
15531 | 122 |
NONE => |
12447 | 123 |
let |
17144 | 124 |
val gr1 = add_edge (dname, dep) |
125 |
(new_node (dname, (SOME (EQN (s, T, "")), module, "")) gr); |
|
126 |
val (gr2, fundef) = mk_fundef module "" "fun " gr1 eqs'; |
|
12447 | 127 |
val xs = cycle gr2 ([], dname); |
17144 | 128 |
val cs = map (fn x => case get_node gr2 x of |
16645 | 129 |
(SOME (EQN (s, T, _)), _, _) => (s, T) |
12447 | 130 |
| _ => error ("RecfunCodegen: illegal cyclic dependencies:\n" ^ |
131 |
implode (separate ", " xs))) xs |
|
132 |
in (case xs of |
|
17144 | 133 |
[_] => (put_code module fundef gr2, module) |
12447 | 134 |
| _ => |
135 |
if not (dep mem xs) then |
|
136 |
let |
|
16645 | 137 |
val thmss as (_, thyname) :: _ = map (get_equations thy defs) cs; |
17144 | 138 |
val module' = if_library thyname module; |
16645 | 139 |
val eqs'' = map (dest_eq o prop_of) (List.concat (map fst thmss)); |
17144 | 140 |
val (gr3, fundef') = mk_fundef module' "" "fun " |
141 |
(add_edge (dname, dep) |
|
142 |
(foldr (uncurry new_node) (del_nodes xs gr2) |
|
15574
b1d1b5bfc464
Removed practically all references to Library.foldr.
skalberg
parents:
15570
diff
changeset
|
143 |
(map (fn k => |
17144 | 144 |
(k, (SOME (EQN ("", dummyT, dname)), module', ""))) xs))) eqs'' |
145 |
in (put_code module' fundef' gr3, module') end |
|
146 |
else (gr2, module)) |
|
12447 | 147 |
end |
17144 | 148 |
| SOME (SOME (EQN (_, _, s)), module', _) => |
149 |
(if s = "" then |
|
150 |
if dname = dep then gr else add_edge (dname, dep) gr |
|
151 |
else if s = dep then gr else add_edge (s, dep) gr, |
|
152 |
module')) |
|
12447 | 153 |
end; |
154 |
||
17144 | 155 |
fun recfun_codegen thy defs gr dep module brack t = (case strip_comb t of |
16645 | 156 |
(Const (p as (s, T)), ts) => (case (get_equations thy defs p, get_assoc_code thy s T) of |
157 |
(([], _), _) => NONE |
|
15531 | 158 |
| (_, SOME _) => NONE |
17144 | 159 |
| ((eqns, thyname), NONE) => |
16645 | 160 |
let |
17144 | 161 |
val module' = if_library thyname module; |
16645 | 162 |
val (gr', ps) = foldl_map |
17144 | 163 |
(invoke_codegen thy defs dep module true) (gr, ts); |
164 |
val suffix = mk_suffix thy defs p; |
|
165 |
val (gr'', module'') = |
|
166 |
add_rec_funs thy defs gr' dep (map prop_of eqns) module'; |
|
167 |
val (gr''', fname) = mk_const_id module'' (s ^ suffix) gr'' |
|
12447 | 168 |
in |
17144 | 169 |
SOME (gr''', mk_app brack (Pretty.str (mk_qual_id module fname)) ps) |
12447 | 170 |
end) |
15531 | 171 |
| _ => NONE); |
12447 | 172 |
|
173 |
||
18708 | 174 |
val setup = |
20597 | 175 |
RecCodegenData.init #> |
18708 | 176 |
add_codegen "recfun" recfun_codegen #> |
18220 | 177 |
add_attribute "" |
19344 | 178 |
(Args.del |-- Scan.succeed del |
20597 | 179 |
|| Scan.option (Args.$$$ "target" |-- Args.colon |-- Args.name) >> (fn name => setmp CodegenData.strict_functyp false (add name))); |
12447 | 180 |
|
181 |
end; |