aboutsummaryrefslogtreecommitdiffstats
path: root/lib/dialyzer
diff options
context:
space:
mode:
authorStavros Aronis <[email protected]>2012-03-16 18:33:05 +0100
committerStavros Aronis <[email protected]>2012-03-26 23:46:27 +0200
commit982d6706df475dc28535d0fe7922573c618bbc36 (patch)
tree05450ca5452905ffe2be08b2bc937e21e146b483 /lib/dialyzer
parent154b98e876256310b3832334695094487da6ea3a (diff)
downloadotp-982d6706df475dc28535d0fe7922573c618bbc36.tar.gz
otp-982d6706df475dc28535d0fe7922573c618bbc36.tar.bz2
otp-982d6706df475dc28535d0fe7922573c618bbc36.zip
Fix bug related with infinitely looping functions
Depending of the ordering of the functions during dataflow, a function with an infinite loop might be identified as one that always crashes. This is fixed now, by allowing restoration of the infinitely-looping status.
Diffstat (limited to 'lib/dialyzer')
-rw-r--r--lib/dialyzer/src/dialyzer_dataflow.erl14
-rw-r--r--lib/dialyzer/test/small_SUITE_data/src/maybe_servers.erl31
2 files changed, 43 insertions, 2 deletions
diff --git a/lib/dialyzer/src/dialyzer_dataflow.erl b/lib/dialyzer/src/dialyzer_dataflow.erl
index aba13278ff..d1dd7e1c34 100644
--- a/lib/dialyzer/src/dialyzer_dataflow.erl
+++ b/lib/dialyzer/src/dialyzer_dataflow.erl
@@ -761,7 +761,13 @@ handle_apply_or_call([{TypeOfApply, {Fun, Sig, Contr, LocalRet}}|Left],
true -> AccArgTypes;
false -> [t_sup(X, Y) || {X, Y} <- lists:zip(NewArgTypes, AccArgTypes)]
end,
- NewAccRet = t_sup(AccRet, t_inf(RetWithoutLocal, LocalRet, opaque)),
+ TotalRet =
+ case t_is_none(LocalRet) andalso t_is_unit(RetWithoutLocal) of
+ true -> RetWithoutLocal;
+ false -> t_inf(RetWithoutLocal, LocalRet, opaque)
+ end,
+ NewAccRet = t_sup(AccRet, TotalRet),
+ ?debug("NewAccRet: ~s\n", [t_to_string(NewAccRet)]),
handle_apply_or_call(Left, Args, ArgTypes, Map, Tree,
State3, NewAccArgTypes, NewAccRet);
handle_apply_or_call([], Args, _ArgTypes, Map, _Tree, State,
@@ -3109,6 +3115,7 @@ init_fun_tab([Fun|Left], Dict, TreeMap, Callgraph, Plt, Opaques) ->
NewDict = dict:store(Fun, FunEntry, Dict),
init_fun_tab(Left, NewDict, TreeMap, Callgraph, Plt, Opaques);
init_fun_tab([], Dict, _TreeMap, _Callgraph, _Plt, _Opaques) ->
+ ?debug("DICT:~p\n",[dict:to_list(Dict)]),
Dict.
state__update_fun_env(Tree, Map, #state{envs = Envs} = State) ->
@@ -3140,7 +3147,9 @@ state__fun_type(Fun, #state{fun_tab = FunTab}) ->
if is_integer(Fun) -> Fun;
true -> get_label(Fun)
end,
- case dict:find(Label, FunTab) of
+ Entry = dict:find(Label, FunTab),
+ ?debug("FunType ~p:~p\n",[Label, Entry]),
+ case Entry of
{ok, {not_handled, {A, R}}} ->
t_fun(A, R);
{ok, {A, R}} ->
@@ -3248,6 +3257,7 @@ state__fun_info(Fun, #state{callgraph = CG, fun_tab = FunTab, plt = PLT}) ->
{not_handled, {_Args, Ret}} -> Ret;
{_Args, Ret} -> Ret
end,
+ ?debug("LocalRet: ~s\n", [t_to_string(LocalRet)]),
{Fun, Sig, Contract, LocalRet}.
state__find_apply_return(Tree, #state{callgraph = Callgraph} = State) ->
diff --git a/lib/dialyzer/test/small_SUITE_data/src/maybe_servers.erl b/lib/dialyzer/test/small_SUITE_data/src/maybe_servers.erl
new file mode 100644
index 0000000000..237f43b1a6
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/src/maybe_servers.erl
@@ -0,0 +1,31 @@
+-module(maybe_servers).
+
+-export([maybe_server/2, mirror_maybe_server/2]).
+
+maybe_server(O, I) ->
+ case O of
+ no ->
+ maybe_loop(fun(_) -> fin end, I);
+ yes ->
+ maybe_loop(fun(X) -> {ok, X} end, I)
+ end.
+
+maybe_loop(F, X)->
+ case F(X) of
+ {ok, Y} -> maybe_loop(F, Y);
+ fin -> exit(n)
+ end.
+
+mirror_maybe_loop(F, X)->
+ case F(X) of
+ {ok, Y} -> mirror_maybe_loop(F, Y);
+ fin -> exit(n)
+ end.
+
+mirror_maybe_server(O, I) ->
+ case O of
+ no ->
+ mirror_maybe_loop(fun(_) -> fin end, I);
+ yes ->
+ mirror_maybe_loop(fun(X) -> {ok, X} end, I)
+ end.