%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1999-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
%%
-module(exception_SUITE).
-export([all/0, suite/0,groups/0,init_per_group/2,end_per_group/2,
init_per_testcase/2,end_per_testcase/2,
init_per_suite/1,end_per_suite/1,
badmatch/1,pending_errors/1,nil_arith/1,
stacktrace/1,nested_stacktrace/1,raise/1,gunilla/1,per/1]).
-export([bad_guy/2]).
-include_lib("common_test/include/ct.hrl").
suite() -> [{ct_hooks,[ts_install_cth]}].
%% Filler.
%%
%%
%%
%%
%% This is line 40.
even(N) when is_integer(N), N > 1, (N rem 2) == 0 ->
odd(N-1)++[N].
odd(N) when is_integer(N), N > 1, (N rem 2) == 1 ->
even(N-1)++[N].
all() ->
cases().
groups() ->
[].
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
cases() ->
[badmatch, pending_errors, nil_arith, stacktrace,
nested_stacktrace, raise, gunilla, per].
-define(try_match(E),
catch ?MODULE:bar(),
{'EXIT', {{badmatch, nomatch}, _}} = (catch E = nomatch)).
init_per_testcase(_Case, Config) ->
test_lib:interpret(?MODULE),
Dog = test_server:timetrap(?t:minutes(1)),
[{watchdog,Dog}|Config].
end_per_testcase(_Case, Config) ->
Dog = ?config(watchdog, Config),
?t:timetrap_cancel(Dog),
ok.
init_per_suite(Config) when is_list(Config) ->
?line test_lib:interpret(?MODULE),
?line true = lists:member(?MODULE, int:interpreted()),
Config.
end_per_suite(Config) when is_list(Config) ->
ok.
%% Test that deliberately bad matches are reported correctly.
badmatch(Config) when is_list(Config) ->
?line ?try_match(a),
?line ?try_match(42),
?line ?try_match({a, b, c}),
?line ?try_match([]),
?line ?try_match(1.0),
ok.
%% Test various exceptions, in the presence of a previous error suppressed
%% in a guard.
pending_errors(Config) when is_list(Config) ->
?line pending(e_badmatch, {badmatch, b}),
?line pending(x, function_clause),
?line pending(e_case, {case_clause, xxx}),
?line pending(e_if, if_clause),
?line pending(e_badarith, badarith),
?line pending(e_undef, undef),
?line pending(e_timeoutval, timeout_value),
?line pending(e_badarg, badarg),
?line 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 id(xxx) of
ok -> ok
end; % case_clause
bad_guy(_, e_if) ->
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 arne -> % timeout_value
ok
end;
bad_guy(_, e_badarg) ->
node(xxx); % badarg
bad_guy(_, e_badarg_spawn) ->
spawn({}, {}, {}); % badarg
bad_guy(_, e_badmatch) ->
a = id(b). % badmatch
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)", [First, Second]),
case catch bad_guy(First, Second) of
{'EXIT', Reason} ->
pending(Reason, bad_guy, [First, Second], Expected);
Other ->
test_server:fail({not_exit, Other})
end.
pending_exit_message(Args, Expected) ->
ok = io:format("Trapping EXITs from spawn_link(~p, ~p, ~p)",
[?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 ->
test_server:fail({unexpected_message, Other})
after 10000 ->
test_server:fail(timeout)
end,
process_flag(trap_exit, false).
pending({badarg, [{erlang,Bif,BifArgs,_},{?MODULE,Func,Arity,_}|_]},
Func, Args, _Code)
when is_atom(Bif), is_list(BifArgs), length(Args) == Arity ->
ok;
pending({undef,[{non_existing_module,foo,[],_}|_]}, _, _, _) ->
ok;
pending({function_clause,[{?MODULE,Func,Args,_}|_]}, Func, Args, _Code) ->
ok;
pending({Code,[{?MODULE,Func,Arity,_}|_]}, Func, Args, Code)
when length(Args) == Arity ->
ok;
pending(Reason, _Function, _Args, _Code) ->
test_server:fail({bad_exit_reason,Reason}).
%% Test that doing arithmetics on [] gives a badarith EXIT and not a crash.
nil_arith(Config) when is_list(Config) ->
?line ba_plus_minus_times([], []),
?line ba_plus_minus_times([], 0),
?line ba_plus_minus_times([], 42),
?line ba_plus_minus_times([], 38724978123478923784),
?line ba_plus_minus_times([], 38.72),
?line ba_plus_minus_times(0, []),
?line ba_plus_minus_times(334, []),
?line ba_plus_minus_times(387249797813478923784, []),
?line ba_plus_minus_times(344.22, []),
?line ba_div_rem([], []),
?line ba_div_rem([], 0),
?line ba_div_rem([], 1),
?line ba_div_rem([], 42),
?line ba_div_rem([], 38724978123478923784),
?line ba_div_rem(344.22, []),
?line ba_div_rem(0, []),
?line ba_div_rem(1, []),
?line ba_div_rem(334, []),
?line ba_div_rem(387249797813478923784, []),
?line ba_div_rem(344.22, []),
?line ba_div_rem(344.22, 0.0),
?line ba_div_rem(1, 0.0),
?line ba_div_rem(392873498733971, 0.0),
?line ba_bop([], []),
?line ba_bop(0, []),
?line ba_bop(42, []),
?line ba_bop(-42342742987343, []),
?line ba_bop(238.342, []),
?line ba_bop([], 0),
?line ba_bop([], -243),
?line ba_bop([], 243),
?line ba_bop([], 2438724982478933),
?line ba_bop([], 3987.37),
?line ba_bnot([]),
?line ba_bnot(23.33),
?line ba_shift([], []),
?line ba_shift([], 0),
?line ba_shift([], 4),
?line ba_shift([], -4),
?line ba_shift([], 2343333333333),
?line ba_shift([], -333333333),
?line ba_shift([], 234.00),
?line ba_shift(23, []),
?line ba_shift(0, []),
?line ba_shift(-3433443433433323, []),
?line ba_shift(433443433433323, []),
?line ba_shift(343.93, []),
ok.
ba_plus_minus_times(A, B) ->
io:format("~p + ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A + B),
io:format("~p - ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A - B),
io:format("~p * ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A * B).
ba_div_rem(A, B) ->
io:format("~p / ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A / B),
io:format("~p div ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A div B),
io:format("~p rem ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A rem B).
ba_bop(A, B) ->
io:format("~p band ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A band B),
io:format("~p bor ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A bor B),
io:format("~p bxor ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A bxor B).
ba_shift(A, B) ->
io:format("~p bsl ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A bsl B),
io:format("~p bsr ~p", [A, B]),
{'EXIT', {badarith, _}} = (catch A bsr B).
ba_bnot(A) ->
io:format("bnot ~p", [A]),
{'EXIT', {badarith, _}} = (catch bnot A).
stacktrace(Conf) when is_list(Conf) ->
Tag = make_ref(),
?line {_,Mref} = spawn_monitor(fun() -> exit({Tag,erlang:get_stacktrace()}) end),
?line {Tag,[]} = receive {'DOWN',Mref,_,_,Info} -> Info end,
V = [make_ref()|self()],
?line {value2,{caught1,badarg,[{erlang,abs,[V],_}|_]=St1}} =
stacktrace_1({'abs',V}, error, {value,V}),
?line St1 = erase(stacktrace1),
?line St1 = erase(stacktrace2),
?line St1 = erlang:get_stacktrace(),
?line {caught2,{error,badarith},[{?MODULE,my_add,2,_}|_]=St2} =
stacktrace_1({'div',{1,0}}, error, {'add',{0,a}}),
?line [{?MODULE,my_div,2,_}|_] = erase(stacktrace1),
?line St2 = erase(stacktrace2),
?line St2 = erlang:get_stacktrace(),
?line {caught2,{error,{try_clause,V}},[{?MODULE,stacktrace_1,3,_}|_]=St3} =
stacktrace_1({value,V}, error, {value,V}),
?line St3 = erase(stacktrace1),
?line St3 = erase(stacktrace2),
?line St3 = erlang:get_stacktrace(),
?line {caught2,{throw,V},[{?MODULE,foo,1,_}|_]=St4} =
stacktrace_1({value,V}, error, {throw,V}),
?line [{?MODULE,stacktrace_1,3,_}|_] = erase(stacktrace1),
?line St4 = erase(stacktrace2),
?line St4 = erlang:get_stacktrace(),
ok.
stacktrace_1(X, C1, Y) ->
erase(stacktrace1),
erase(stacktrace2),
try try foo(X) of
C1 -> value1
catch
C1:D1 -> {caught1,D1,erlang:get_stacktrace()}
after
put(stacktrace1, erlang:get_stacktrace()),
foo(Y)
end of
V2 -> {value2,V2}
catch
C2:D2 -> {caught2,{C2,D2},erlang:get_stacktrace()}
after
put(stacktrace2, erlang:get_stacktrace())
end.
nested_stacktrace(Conf) when is_list(Conf) ->
V = [{make_ref()}|[self()]],
?line value1 =
nested_stacktrace_1({{value,{V,x1}},void,{V,x1}},
{void,void,void}),
?line {caught1,
[{?MODULE,my_add,2,_}|_],
value2,
[{?MODULE,my_add,2,_}|_]} =
nested_stacktrace_1({{'add',{V,x1}},error,badarith},
{{value,{V,x2}},void,{V,x2}}),
?line {caught1,
[{?MODULE,my_add,2,_}|_],
{caught2,[{erlang,abs,[V],_}|_]},
[{erlang,abs,[V],_}|_]} =
nested_stacktrace_1({{'add',{V,x1}},error,badarith},
{{'abs',V},error,badarg}),
ok.
nested_stacktrace_1({X1,C1,V1}, {X2,C2,V2}) ->
try foo(X1) of
V1 -> value1
catch
C1:V1 ->
S1 = erlang:get_stacktrace(),
T2 =
try foo(X2) of
V2 -> value2
catch
C2:V2 -> {caught2,erlang:get_stacktrace()}
end,
{caught1,S1,T2,erlang:get_stacktrace()}
end.
raise(Conf) when is_list(Conf) ->
?line erase(raise),
?line A =
try
?line try foo({'div',{1,0}})
catch
error:badarith ->
put(raise, A0 = erlang:get_stacktrace()),
?line erlang:raise(error, badarith, A0)
end
catch
error:badarith ->
?line A1 = erlang:get_stacktrace(),
?line A1 = get(raise)
end,
?line A = erlang:get_stacktrace(),
?line A = get(raise),
?line [{?MODULE,my_div,2,_}|_] = A,
%%
N = 8, % Must be even
?line N = erlang:system_flag(backtrace_depth, N),
?line try even(N)
catch error:function_clause -> ok
end,
?line B = odd_even(N, []),
?line B = erlang:get_stacktrace(),
%%
?line C0 = odd_even(N+1, []),
?line C = lists:sublist(C0, N),
?line try odd(N+1)
catch error:function_clause -> ok
end,
?line C = erlang:get_stacktrace(),
?line try erlang:raise(error, function_clause, C0)
catch error:function_clause -> ok
end,
?line C = erlang:get_stacktrace(),
ok.
odd_even(N, R) when is_integer(N), N > 1 ->
odd_even(N-1,
[if (N rem 2) == 0 ->
{?MODULE,even,1,[{file,?MODULE_STRING++".erl"},
{line,42}]};
true ->
{?MODULE,odd,1,[{file,?MODULE_STRING++".erl"},
{line,45}]}
end|R]);
odd_even(1, R) ->
[{?MODULE,odd,[1],[{file,?MODULE_STRING++".erl"},
{line,44}]}|R].
foo({value,Value}) -> Value;
foo({'div',{A,B}}) ->
my_div(A, B);
foo({'add',{A,B}}) ->
my_add(A, B);
foo({'abs',X}) ->
my_abs(X);
foo({error,Error}) ->
erlang:error(Error);
foo({throw,Throw}) ->
erlang:throw(Throw);
foo({exit,Exit}) ->
erlang:exit(Exit);
foo({raise,{Class,Reason,Stacktrace}}) ->
erlang:raise(Class, Reason, Stacktrace).
%%foo(function_clause) -> % must not be defined!
my_div(A, B) ->
A div B.
my_add(A, B) ->
A + B.
my_abs(X) -> abs(X).
gunilla(Config) when is_list(Config) ->
?line {throw,kalle} = gunilla_1(),
?line [] = erlang:get_stacktrace(),
ok.
gunilla_1() ->
try try arne()
after
pelle
end
catch
C:R ->
{C,R}
end.
arne() ->
%% Empty stack trace used to cause change the error class to 'error'.
erlang:raise(throw, kalle, []).
per(Config) when is_list(Config) ->
try
t1(0,pad,0),
t2(0,pad,0)
catch
error:badarith ->
ok
end.
t1(_,X,_) ->
(1 bsl X) + 1.
t2(_,X,_) ->
(X bsl 1) + 1.
id(I) -> I.
