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
|
(* 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 Effective :> EFFECTIZE = struct
open Core
structure U = CoreUtil
structure IM = IntBinaryMap
structure SS = BinarySetFn(struct
type ord_key = string
val compare = String.compare
end)
fun effectful x = Settings.isEffectful x andalso not (Settings.isClientOnly x)
fun effectize file =
let
fun expOnload evs e =
case e of
EFfi f => effectful f
| EFfiApp (m, x, _) => effectful (m, x)
| ENamed n => IM.inDomain (evs, n)
| EServerCall (n, _, _, _, _) => IM.inDomain (evs, n)
| _ => false
fun couldWriteOnload evs = U.Exp.exists {kind = fn _ => false,
con = fn _ => false,
exp = expOnload evs}
fun exp evs e =
case e of
EFfi f => effectful f
| EFfiApp (m, x, _) => effectful (m, x)
| ENamed n => IM.inDomain (evs, n)
| ERecord xets => List.exists (fn ((CName "Onload", _), e, _) => couldWriteOnload evs e
| _ => false) xets
| _ => false
fun couldWrite evs = U.Exp.exists {kind = fn _ => false,
con = fn _ => false,
exp = exp evs}
fun exp evs e =
case e of
EFfi ("Basis", "getCookie") => true
| ENamed n => IM.inDomain (evs, n)
| EServerCall (n, _, _, _, _) => IM.inDomain (evs, n)
| _ => false
fun couldReadCookie evs = U.Exp.exists {kind = fn _ => false,
con = fn _ => false,
exp = exp evs}
fun doDecl (d, evs as (writers, readers)) =
case #1 d of
DVal (x, n, t, e, s) =>
(d, (if couldWrite writers e then
IM.insert (writers, n, (#2 d, s))
else
writers,
if couldReadCookie readers e then
IM.insert (readers, n, (#2 d, s))
else
readers))
| DValRec vis =>
let
fun oneRound evs =
foldl (fn ((_, n, _, e, s), (changed, (writers, readers))) =>
let
val (changed, writers) =
if couldWrite writers e andalso not (IM.inDomain (writers, n)) then
(true, IM.insert (writers, n, (#2 d, s)))
else
(changed, writers)
val (changed, readers) =
if couldReadCookie readers e andalso not (IM.inDomain (readers, n)) then
(true, IM.insert (readers, n, (#2 d, s)))
else
(changed, readers)
in
(changed, (writers, readers))
end) (false, evs) vis
fun loop evs =
let
val (b, evs) = oneRound evs
in
if b then
loop evs
else
evs
end
in
(d, loop (writers, readers))
end
| DExport (Link, n) =>
(case IM.find (writers, n) of
NONE => ()
| SOME (loc, s) => ErrorMsg.errorAt loc ("A link (" ^ s ^ ") could cause side effects; try implementing it with a form instead");
(d, evs))
| DExport (Action _, n) =>
((DExport (Action (if IM.inDomain (writers, n) then
if IM.inDomain (readers, n) then
ReadCookieWrite
else
ReadWrite
else
ReadOnly), n), #2 d),
evs)
| DExport (Rpc _, n) =>
((DExport (Rpc (if IM.inDomain (writers, n) then
if IM.inDomain (readers, n) then
ReadCookieWrite
else
ReadWrite
else
ReadOnly), n), #2 d),
evs)
| _ => (d, evs)
val (file, _) = ListUtil.foldlMap doDecl (IM.empty, IM.empty) file
in
file
end
end
|
