summaryrefslogtreecommitdiff
path: root/src/checknest.sml
blob: a53c7083c0a8082f604057bef0631294205a506e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
(* Copyright (c) 2009, Adam Chlipala
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - The names of contributors may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *)

structure Checknest :> CHECKNEST = struct

open Cjr

structure IS = IntBinarySet
structure IM = IntBinaryMap

fun expUses globals =
    let
        fun eu (e, _) =
            case e of
                EPrim _ => IS.empty
              | ERel _ => IS.empty
              | ENamed n => Option.getOpt (IM.find (globals, n), IS.empty)
              | ECon (_, _, NONE) => IS.empty
              | ECon (_, _, SOME e) => eu e
              | ENone _ => IS.empty
              | ESome (_, e) => eu e
              | EFfi _ => IS.empty
              | EFfiApp (_, _, es) => foldl IS.union IS.empty (map eu es)
              | EApp (e, es) => foldl IS.union (eu e) (map eu es)

              | EUnop (_, e) => eu e
              | EBinop (_, e1, e2) => IS.union (eu e1, eu e2)

              | ERecord (_, xes) => foldl (fn ((_, e), s) => IS.union (eu e, s)) IS.empty xes
              | EField (e, _) => eu e

              | ECase (e, pes, _) => foldl (fn ((_, e), s) => IS.union (eu e, s)) (eu e) pes

              | EError (e, _) => eu e
              | EReturnBlob {blob, mimeType, ...} => IS.union (eu blob, eu mimeType)
              | ERedirect (e, _) => eu e

              | EWrite e => eu e
              | ESeq (e1, e2) => IS.union (eu e1, eu e2)
              | ELet (_, _, e1, e2) => IS.union (eu e1, eu e2)

              | EQuery {query, body, initial, prepared, ...} =>
                let
                    val s = IS.union (eu query, IS.union (eu body, eu initial))
                in
                    case prepared of
                        SOME {id, ...} => IS.add (s, id)
                      | _ => s
                end
              | EDml {dml, prepared, ...} =>
                let
                    val s = eu dml
                in
                    case prepared of
                        SOME {id, ...} => IS.add (s, id)
                      | _ => s
                end
              | ENextval {seq, prepared, ...} =>
                let
                    val s = eu seq
                in
                    case prepared of
                        SOME {id, ...} => IS.add (s, id)
                      | _ => s
                end
              | ESetval {seq, count} => IS.union (eu seq, eu count)

              | EUnurlify (e, _, _) => eu e
    in
        eu
    end

fun annotateExp globals =
    let
        fun ae (e as (_, loc)) =
            case #1 e of
                EPrim _ => e
              | ERel _ => e
              | ENamed n => e
              | ECon (_, _, NONE) => e
              | ECon (dk, pc, SOME e) => (ECon (dk, pc, SOME (ae e)), loc)
              | ENone _ => e
              | ESome (t, e) => (ESome (t, ae e), loc)
              | EFfi _ => e
              | EFfiApp (m, f, es) => (EFfiApp (m, f, map ae es), loc)
              | EApp (e, es) => (EApp (ae e, map ae es), loc)

              | EUnop (uo, e) => (EUnop (uo, ae e), loc)
              | EBinop (bo, e1, e2) => (EBinop (bo, ae e1, ae e2), loc)

              | ERecord (n, xes) => (ERecord (n, map (fn (x, e) => (x, ae e)) xes), loc)
              | EField (e, f) => (EField (ae e, f), loc)

              | ECase (e, pes, ts) => (ECase (ae e, map (fn (p, e) => (p, ae e)) pes, ts), loc)

              | EError (e, t) => (EError (ae e, t), loc)
              | EReturnBlob {blob, mimeType, t} => (EReturnBlob {blob = ae blob, mimeType = ae mimeType, t = t}, loc)
              | ERedirect (e, t) => (ERedirect (ae e, t), loc)

              | EWrite e => (EWrite (ae e), loc)
              | ESeq (e1, e2) => (ESeq (ae e1, ae e2), loc)
              | ELet (x, t, e1, e2) => (ELet (x, t, ae e1, ae e2), loc)

              | EQuery {exps, tables, rnum, state, query, body, initial, prepared} =>
                (EQuery {exps = exps,
                         tables = tables,
                         rnum = rnum,
                         state = state,
                         query = ae query,
                         body = ae body,
                         initial = ae initial,
                         prepared = case prepared of
                                        NONE => NONE
                                      | SOME {id, query, ...} => SOME {id = id, query = query,
                                                                       nested = IS.member (expUses globals body, id)}},
                 loc)
              | EDml {dml, prepared} =>
                (EDml {dml = ae dml,
                       prepared = prepared}, loc)

              | ENextval {seq, prepared} =>
                (ENextval {seq = ae seq,
                           prepared = prepared}, loc)
              | ESetval {seq, count} =>
                (ESetval {seq = ae seq,
                          count = ae count}, loc)

              | EUnurlify (e, t, b) => (EUnurlify (ae e, t, b), loc)
    in
        ae
    end

fun annotate (ds, syms) =
    let
        val globals =
            foldl (fn ((d, _), globals) =>
                      case d of
                          DVal (_, n, _, e) => IM.insert (globals, n, expUses globals e)
                        | DFun (_, n, _, _, e) => IM.insert (globals, n, expUses globals e)
                        | DFunRec fs =>
                          let
                              val s = foldl (fn ((_, _, _, _, e), s) => IS.union (expUses globals e, s)) IS.empty fs
                          in
                              foldl (fn ((_, n, _, _, _), globals) => IM.insert (globals, n, s)) globals fs
                          end
                        | _ => globals) IM.empty ds

        val ds =
            map (fn d as (_, loc) =>
                    case #1 d of
                        DVal (x, n, t, e) => (DVal (x, n, t, annotateExp globals e), loc)
                      | DFun (x, n, ts, t, e) => (DFun (x, n, ts, t, annotateExp globals e), loc)
                      | DFunRec fs => (DFunRec
                                           (map (fn (x, n, ts, t, e) => (x, n, ts, t, annotateExp globals e)) fs), loc)
                      | _ => d) ds
    in
        (ds, syms)
    end

end