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-rw-r--r--src/iflow.sml19
1 files changed, 19 insertions, 0 deletions
diff --git a/src/iflow.sml b/src/iflow.sml
index 77f25a91..721a6c25 100644
--- a/src/iflow.sml
+++ b/src/iflow.sml
@@ -1984,6 +1984,21 @@ fun addUpdate (t : t, c) = {Var = #Var t,
end
+fun havocReln r =
+ let
+ fun hr p =
+ case p of
+ True => p
+ | False => p
+ | Unknown => p
+ | And (p1, p2) => And (hr p1, hr p2)
+ | Or (p1, p2) => Or (hr p1, hr p2)
+ | Reln (r', _) => if r' = r then True else p
+ | Cond (e, p) => Cond (e, hr p)
+ in
+ hr
+ end
+
fun evalExp env (e as (_, loc), st) =
let
fun default () =
@@ -2259,6 +2274,8 @@ fun evalExp env (e as (_, loc), st) =
val p = And (p,
And (Reln (Sql "$Old", [Var old]),
Reln (Sql tab, [Var old])))
+
+ val st = St.setAmbient (st, havocReln (Sql tab) (St.ambient st))
in
(Recd [], St.addDelete (st, (loc, And (St.ambient st, p))))
end
@@ -2308,6 +2325,8 @@ fun evalExp env (e as (_, loc), st) =
And (Reln (Sql (tab ^ "$New"), [Recd fs]),
And (Reln (Sql "$Old", [Var old]),
Reln (Sql tab, [Var old]))))
+
+ val st = St.setAmbient (st, havocReln (Sql tab) (St.ambient st))
in
(Recd [], St.addUpdate (st, (loc, And (St.ambient st, p))))
end)