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-rw-r--r--lib/dialyzer/src/dialyzer_dataflow.erl44
1 files changed, 42 insertions, 2 deletions
diff --git a/lib/dialyzer/src/dialyzer_dataflow.erl b/lib/dialyzer/src/dialyzer_dataflow.erl
index 9827fda6e3..f0fa9fbb4e 100644
--- a/lib/dialyzer/src/dialyzer_dataflow.erl
+++ b/lib/dialyzer/src/dialyzer_dataflow.erl
@@ -1794,9 +1794,49 @@ bind_guard(Guard, Map, Env, Eval, State) ->
'try' ->
Arg = cerl:try_arg(Guard),
[Var] = cerl:try_vars(Guard),
+ EVars = cerl:try_evars(Guard),
%%?debug("Storing: ~w\n", [Var]),
- NewEnv = dict:store(get_label(Var), Arg, Env),
- bind_guard(cerl:try_body(Guard), Map, NewEnv, Eval, State);
+ Map1 = join_maps_begin(Map),
+ Map2 = mark_as_fresh(EVars, Map1),
+ %% Visit handler first so we know if it should be ignored
+ {{HandlerMap, HandlerType}, HandlerE} =
+ try {bind_guard(cerl:try_handler(Guard), Map2, Env, Eval, State), none}
+ catch throw:HE ->
+ {{Map2, t_none()}, HE}
+ end,
+ BodyEnv = dict:store(get_label(Var), Arg, Env),
+ Wanted = case Eval of pos -> t_atom(true); neg -> t_atom(false);
+ dont_know -> t_any() end,
+ case t_is_none(t_inf(HandlerType, Wanted)) of
+ %% Handler won't save us; pretend it does not exist
+ true -> bind_guard(cerl:try_body(Guard), Map, BodyEnv, Eval, State);
+ false ->
+ {{BodyMap, BodyType}, BodyE} =
+ try {bind_guard(cerl:try_body(Guard), Map1, BodyEnv,
+ Eval, State), none}
+ catch throw:BE ->
+ {{Map1, t_none()}, BE}
+ end,
+ Map3 = join_maps_end([BodyMap, HandlerMap], Map1),
+ case t_is_none(Sup = t_sup(BodyType, HandlerType)) of
+ true ->
+ %% Pick a reason. N.B. We assume that the handler is always
+ %% compiler-generated if the body is; that way, we won't need to
+ %% check.
+ Fatality = case {BodyE, HandlerE} of
+ {{fatal_fail, _}, _} -> fatal_fail;
+ {_, {fatal_fail, _}} -> fatal_fail;
+ _ -> fail
+ end,
+ throw({Fatality,
+ case {BodyE, HandlerE} of
+ {{_, Rsn}, _} when Rsn =/= none -> Rsn;
+ {_, {_,Rsn}} -> Rsn;
+ _ -> none
+ end});
+ false -> {Map3, Sup}
+ end
+ end;
tuple ->
Es0 = cerl:tuple_es(Guard),
{Map1, Es} = bind_guard_list(Es0, Map, Env, dont_know, State),