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+%%% -*- erlang-indent-level: 2 -*-
+%%%---------------------------------------------------------------------
+%%% Author: Kostis Sagonas
+%%%
+%%% Contains tests cases for compilation of arithmetic.
+%%%---------------------------------------------------------------------
+-module(basic_arith).
+
+-export([test/0]).
+
+test() ->
+ ok = test_rem(),
+ ok = test_bit_ops(),
+ ok = test_uplus(),
+ ok = test_bsl_errors(),
+ ok.
+
+%%----------------------------------------------------------------------
+%% Tests the remainder operator.
+
+test_rem() ->
+ 2 = ret_rem(42, 20),
+ -2 = ret_rem(-42, 20),
+ -2 = ret_rem(-42, -20),
+ {'EXIT', {badarith, _}} = ret_rem(3.14, 2),
+ {'EXIT', {badarith, _}} = ret_rem(42, 3.14),
+ ok.
+
+ret_rem(X, Y) ->
+ catch X rem Y.
+
+%%----------------------------------------------------------------------
+%%
+
+test_bit_ops() ->
+ 2 = bbb(11, 2, 16#3ff),
+ ok.
+
+bbb(X, Y, Z) ->
+ ((1 bsl X) bor Y) band Z.
+
+%%----------------------------------------------------------------------
+%% Tests unary plus: it used to be the identity function but not anymore
+
+test_uplus() ->
+ badarith = try uplus(gazonk) catch error:Err -> Err end,
+ 42 = uplus(42),
+ ok.
+
+uplus(X) -> +(X).
+
+%%----------------------------------------------------------------------
+%% The first part of this test triggered a bug in the emulator as one
+%% of the arguments to bsl is not an integer.
+%%
+%% The second part triggered a compilation crash since an arithmetic
+%% expression resulting in a 'system_limit' exception was statically
+%% evaluated and an arithmetic result was expected.
+
+test_bsl_errors() ->
+ {'EXIT', {'badarith', _}} = (catch (t1(0, pad, 0))),
+ badarith = try t2(0, pad, 0) catch error:Err1 -> Err1 end,
+ system_limit = try (id(1) bsl 100000000) catch error:Err2 -> Err2 end,
+ ok.
+
+t1(_, X, _) ->
+ (1 bsl X) + 1.
+
+t2(_, X, _) ->
+ (X bsl 1) + 1.
+
+id(I) -> I.