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%%% -*- erlang-indent-level: 2 -*-
%%%-------------------------------------------------------------------
%%% Author: Kostis Sagonas
%%%
%%% Contains tests that raise exceptions and catch them.
%%%-------------------------------------------------------------------
-module(basic_exceptions).
-export([test/0]).
%% functions used as arguments to spawn/3
-export([bad_guy/2]).
test() ->
ok = test_catch_exit(42),
ok = test_catch_throw(42),
ok = test_catch_element(),
ok = test_catch_merge(),
ok = test_pending_errors(),
ok = test_bad_fun_call(),
ok.
%%--------------------------------------------------------------------
test_catch_exit(N) ->
{'EXIT', N} = (catch exit(N)),
{'EXIT', 42} = (catch exit(42)),
42 = try exit(N) catch exit:R1 -> R1 end,
42 = try exit(42) catch exit:R2 -> R2 end,
ok.
%%--------------------------------------------------------------------
test_catch_throw(N) ->
N = (catch throw(N)),
42 = (catch throw(42)),
42 = try throw(N) catch throw:R1 -> R1 end,
42 = try throw(42) catch throw:R2 -> R2 end,
ok.
%%--------------------------------------------------------------------
test_catch_element() ->
'EXIT' = test_catch_element([]),
'EXIT' = test_catch_element(42),
ok.
test_catch_element(N) ->
element(1, catch element(N, {1,2,3,4,5,6,7,8,9,10,11})).
%%--------------------------------------------------------------------
%% Test that shows how BEAM can merge catch-end blocks that belong to
%% different catch-start instructions. Written by Richard Carlsson.
%%--------------------------------------------------------------------
test_catch_merge() ->
merge(get(whatever)).
merge(foo=X) ->
catch f(X),
catch g(X);
merge(X) ->
catch f(X),
catch g(X).
f(_) -> ok.
g(_) -> ok.
%%--------------------------------------------------------------------
%% Taken from exception_SUITE.erl
%%--------------------------------------------------------------------
test_pending_errors() ->
error_logger:tty(false), % disable printouts of error reports
pending_errors().
%% Test various exceptions, in the presence of a previous error
%% suppressed in a guard.
pending_errors() ->
pending(e_badmatch, {badmatch, b}),
pending(x, function_clause),
pending(e_case, {case_clause, xxx}),
pending(e_if, if_clause),
%% pending(e_badarith, badarith),
%% pending(e_undef, undef),
pending(e_timeoutval, timeout_value),
%% pending(e_badarg, badarg),
%% pending(e_badarg_spawn, badarg),
ok.
bad_guy(pe_badarith, Other) when Other+1 =:= 0 -> % badarith (suppressed)
ok;
bad_guy(pe_badarg, Other) when length(Other) > 0 -> % badarg (suppressed)
ok;
bad_guy(_, e_case) ->
case xxx() of
ok -> ok
end; % case_clause
bad_guy(_, e_if) ->
B = b(),
if
a == B -> ok
end; % if_clause
%% bad_guy(_, e_badarith) ->
%% 1+b; % badarith
bad_guy(_, e_undef) ->
non_existing_module:foo(); % undef
bad_guy(_, e_timeoutval) ->
receive
after gazonk -> ok % timeout_value
end;
bad_guy(_, e_badarg) ->
node(xxx); % badarg
bad_guy(_, e_badarg_spawn) ->
spawn({}, {}, {}); % badarg
bad_guy(_, e_badmatch) ->
a = b(). % badmatch
xxx() -> xxx.
b() -> b.
pending(Arg, Expected) ->
pending(pe_badarith, Arg, Expected),
pending(pe_badarg, Arg, Expected).
pending(First, Second, Expected) ->
pending_catched(First, Second, Expected),
pending_exit_message([First, Second], Expected).
pending_catched(First, Second, Expected) ->
%% ok = io:format("Catching bad_guy(~p, ~p)\n", [First, Second]),
case catch bad_guy(First, Second) of
{'EXIT', Reason} ->
pending(Reason, bad_guy, [First, Second], Expected);
Other ->
exit({not_exit, Other})
end.
pending_exit_message(Args, Expected) ->
%% ok = io:format("Trapping exits from spawn_link(~p, ~p, ~p)\n",
%% [?MODULE, bad_guy, Args]),
process_flag(trap_exit, true),
Pid = spawn_link(?MODULE, bad_guy, Args),
receive
{'EXIT', Pid, Reason} ->
pending(Reason, bad_guy, Args, Expected);
Other ->
exit({unexpected_message, Other})
after 10000 ->
exit(timeout)
end,
process_flag(trap_exit, false).
%% pending({badarg, [{erlang,Bif,BifArgs},{?MODULE,Func,Arity}|_]},
%% Func, Args, _Code)
%% when atom(Bif), list(BifArgs), length(Args) =:= Arity ->
%% ok;
pending({badarg,Trace}, _, _, _) when is_list(Trace) ->
ok;
%% pending({undef,[{non_existing_module,foo,[]}|_]}, _, _, _) ->
%% ok;
pending({undef,Trace}, _, _, _) when is_list(Trace) ->
ok;
%% pending({function_clause,[{?MODULE,Func,Args}|_]}, Func, Args, _Code) ->
%% ok;
pending({function_clause,Trace}, _, _, _) when is_list(Trace) ->
ok;
%% pending({Code,[{?MODULE,Func,Arity}|_]}, Func, Args, Code)
%% when length(Args) =:= Arity ->
%% ok;
pending({Code,Trace}, _, _, Code) when is_list(Trace) ->
ok;
pending(Reason, _Function, _Args, _Code) ->
exit({bad_exit_reason, Reason}).
%%--------------------------------------------------------------------
%% Taken from fun_SUITE.erl
%%
%% Checks correct exception throwing when calling a bad fun.
%%--------------------------------------------------------------------
test_bad_fun_call() ->
ok = bad_call_fc(42),
ok = bad_call_fc(xx),
ok = bad_call_fc({}),
ok = bad_call_fc({1}),
ok = bad_call_fc({1,2,3}),
ok = bad_call_fc({1,2,3}),
ok = bad_call_fc({1,2,3,4}),
ok = bad_call_fc({1,2,3,4,5,6}),
ok = bad_call_fc({1,2,3,4,5}),
ok = bad_call_fc({1,2}),
ok.
bad_call_fc(Fun) ->
Args = [some, stupid, args],
Res = (catch Fun(Fun(Args))),
case Res of
{'EXIT', {{badfun, Fun} ,_Where}} ->
ok; %% = io:format("~p(~p) -> ~p\n", [Fun, Args, Res]);
Other ->
io:format("~p(~p) -> ~p\n", [Fun, Args, Res]),
exit({bad_result, Other})
end.
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