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authorBjörn-Egil Dahlberg <[email protected]>2014-02-27 17:50:58 +0100
committerBjörn-Egil Dahlberg <[email protected]>2014-02-27 18:39:07 +0100
commit615e41b3810cecc7a30668193ce1fb0207cc42c7 (patch)
tree681b4ee32a3a603bca9d0a04c2373f9e542f2850 /erts
parent2202a8880f5472ce4bf65afdb967c70a12f35703 (diff)
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erts: Fix Map cmp exact equal of an empty map
The expression, #{} =:= M where M was any Map, would always result in 'true'. This commit fixes this issue by first comparing sizes for both terms and then checking for size zero.
Diffstat (limited to 'erts')
-rw-r--r--erts/emulator/beam/utils.c6
-rw-r--r--erts/emulator/test/map_SUITE.erl19
2 files changed, 24 insertions, 1 deletions
diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index 5b43d25e3c..738f793020 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -2125,7 +2125,11 @@ tailrecur_ne:
if (!is_boxed(b) || *boxed_val_rel(b,b_base) != *aa)
goto not_equal;
bb = map_val_rel(b,b_base);
- if ((sz = map_get_size((map_t*)aa)) == 0) goto pop_next;
+ sz = map_get_size((map_t*)aa);
+
+ if (sz != map_get_size((map_t*)bb)) goto not_equal;
+ if (sz == 0) goto pop_next;
+
aa += 2;
bb += 2;
sz += 1; /* increment for tuple-keys */
diff --git a/erts/emulator/test/map_SUITE.erl b/erts/emulator/test/map_SUITE.erl
index 8cc5621181..753d6f7727 100644
--- a/erts/emulator/test/map_SUITE.erl
+++ b/erts/emulator/test/map_SUITE.erl
@@ -29,6 +29,7 @@
t_guard_receive/1, t_guard_fun/1,
t_list_comprehension/1,
t_map_sort_literals/1,
+ t_map_equal/1,
%t_size/1,
t_map_size/1,
@@ -74,6 +75,7 @@ all() -> [
t_update_assoc,t_update_exact,
t_guard_bifs, t_guard_sequence, t_guard_update,
t_guard_receive,t_guard_fun, t_list_comprehension,
+ t_map_equal,
t_map_sort_literals,
%% Specific Map BIFs
@@ -450,6 +452,23 @@ t_map_sort_literals(Config) when is_list(Config) ->
ok.
+t_map_equal(Config) when is_list(Config) ->
+ true = id(#{}) =:= id(#{}),
+ false = id(#{}) =:= id(#{a=>1}),
+ false = id(#{a=>1}) =:= id(#{}),
+ true = id(#{ "a" => "hi", b => 134 }) =:= id(#{ b => 134,"a" => "hi"}),
+
+ false = id(#{ a => 1 }) =:= id(#{ a => 2}),
+ false = id(#{ a => 2 }) =:= id(#{ a => 1}),
+ false = id(#{ a => 2, b => 1 }) =:= id(#{ a => 1, b => 3}),
+ false = id(#{ a => 1, b => 1 }) =:= id(#{ a => 1, b => 3}),
+
+ true = id(#{ a => 1 }) =:= id(#{ a => 1}),
+ true = id(#{ "a" => 2 }) =:= id(#{ "a" => 2}),
+ true = id(#{ "a" => 2, b => 3 }) =:= id(#{ "a" => 2, b => 3}),
+ true = id(#{ a => 1, b => 3, c => <<"wat">> }) =:= id(#{ a => 1, b => 3, c=><<"wat">>}),
+ ok.
+
%% BIFs
t_bif_map_get(Config) when is_list(Config) ->