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+%%% -*- erlang-indent-level: 2 -*-
+%%%-------------------------------------------------------------------
+%%% Author: Kostis Sagonas
+%%%
+%%% Tests for correct translation of various BEAM instructions.
+%%%-------------------------------------------------------------------
+-module(basic_beam_instrs).
+
+-export([test/0]).
+
+test() ->
+ ok = test_make_fun(),
+ ok = test_switch_val(),
+ ok = test_put_literal(),
+ ok = test_set_tuple_element(),
+ ok = test_unguarded_unsafe_element(),
+ ok.
+
+%%--------------------------------------------------------------------
+%% Tests whether the translation of make_fun works.
+
+test_make_fun() ->
+ {F, G} = double_the_fun(),
+ ok = F(),
+ {ok, 42} = G(42),
+ FV1 = {ok, free_var1},
+ FV2 = {also, {free, var2}},
+ {FV1, {ok, [bv]}, FV2} = contains_fun(FV1, ignored, FV2),
+ ok.
+
+double_the_fun() ->
+ {fun () -> ok end, fun (V) -> {ok, V} end}.
+
+contains_fun(X, _IGNORED_ARG, Y) ->
+ calls_fun(fun(Term) -> {X, Term, Y} end).
+
+calls_fun(F) ->
+ F({ok, [bv]}).
+
+%%--------------------------------------------------------------------
+%% Tests whether the translation of switch_val works.
+
+test_switch_val() ->
+ 'A' = sv(a),
+ 'B' = sv(b),
+ 'C' = sv(c),
+ foo = sv(d),
+ ok.
+
+sv(a) -> 'A';
+sv(b) -> 'B';
+sv(c) -> 'C';
+sv(_) -> foo.
+
+%%--------------------------------------------------------------------
+%% Tests correct handling of literals (statically constant terms)
+
+-define(QUADRUPLE, {a,b,c,42}).
+-define(DEEP_LIST, [42,[42,[42]]]).
+
+test_put_literal() ->
+ ?QUADRUPLE = mk_literal_quadruple(),
+ ?DEEP_LIST = mk_literal_deep_list(),
+ ok.
+
+mk_literal_quadruple() ->
+ ?QUADRUPLE.
+
+mk_literal_deep_list() ->
+ ?DEEP_LIST.
+
+%%--------------------------------------------------------------------
+%% Tests whether the translation of set_tuple_element works.
+
+-record(rec, {f1, f2, f3, f4, f5}).
+
+test_set_tuple_element() ->
+ F2 = [a,b,c], F4 = {a,b},
+ State0 = init_rec(F2, F4),
+ State1 = simple_set(State0, 42),
+ #rec{f1 = foo, f2 = F2, f3 = 42, f4 = F4, f5 = 42.0} = odd_set(State1, 21),
+ ok.
+
+init_rec(F2, F4) ->
+ #rec{f1 = bar, f2 = F2, f3 = 10, f4 = F4, f5 = 3.14}.
+
+simple_set(State, Val) -> %% f3 = Val is the one used in set_element;
+ State#rec{f3 = Val, f5 = Val*2}. %% this checks the case of variable
+
+odd_set(State, Val) -> %% f3 = foo is the one used in set_element;
+ State#rec{f1 = foo, f5 = Val*2.0}. %% this checks the case of constant
+
+%%--------------------------------------------------------------------
+%% Tests the handling of unguarded unsafe_element operations that BEAM
+%% can sometimes construct on records (when it has enough context).
+
+test_unguarded_unsafe_element() ->
+ {badrecord, rec} = try unguarded_unsafe_element(42) catch error:E -> E end,
+ ok.
+
+unguarded_unsafe_element(X) ->
+ X#rec{f1 = X#rec.f3}.