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-rw-r--r--lib/compiler/src/v3_core.erl32
-rw-r--r--lib/compiler/test/warnings_SUITE.erl107
2 files changed, 131 insertions, 8 deletions
diff --git a/lib/compiler/src/v3_core.erl b/lib/compiler/src/v3_core.erl
index f40cf97f57..14cd41ae27 100644
--- a/lib/compiler/src/v3_core.erl
+++ b/lib/compiler/src/v3_core.erl
@@ -883,19 +883,33 @@ badmap_term(Map, #core{in_guard=false}) ->
c_tuple([#c_literal{val=badmap},Map]).
map_build_pairs(Map, Es0, Ann, St0) ->
- {Es,Pre,St1} = map_build_pairs_1(Es0, St0),
+ {Es,Pre,_,St1} = map_build_pairs_1(Es0, cerl_sets:new(), St0),
{ann_c_map(Ann, Map, Es),Pre,St1}.
-map_build_pairs_1([{Op0,L,K0,V0}|Es], St0) ->
+map_build_pairs_1([{Op0,L,K0,V0}|Es], Used0, St0) ->
{K,Pre0,St1} = safe(K0, St0),
{V,Pre1,St2} = safe(V0, St1),
- {Pairs,Pre2,St3} = map_build_pairs_1(Es, St2),
+ {Pairs,Pre2,Used1,St3} = map_build_pairs_1(Es, Used0, St2),
As = lineno_anno(L, St3),
Op = map_op(Op0),
+ {Used2,St4} = maybe_warn_repeated_keys(K, L, Used1, St3),
Pair = cerl:ann_c_map_pair(As, Op, K, V),
- {[Pair|Pairs],Pre0++Pre1++Pre2,St3};
-map_build_pairs_1([], St) ->
- {[],[],St}.
+ {[Pair|Pairs],Pre0++Pre1++Pre2,Used2,St4};
+map_build_pairs_1([], Used, St) ->
+ {[],[],Used,St}.
+
+maybe_warn_repeated_keys(Ck,Line,Used,St) ->
+ case cerl:is_literal(Ck) of
+ false -> {Used,St};
+ true ->
+ K = cerl:concrete(Ck),
+ case cerl_sets:is_element(K,Used) of
+ true ->
+ {Used, add_warning(Line, {map_key_repeated,K}, St)};
+ false ->
+ {cerl_sets:add_element(K,Used), St}
+ end
+ end.
map_op(map_field_assoc) -> #c_literal{val=assoc};
map_op(map_field_exact) -> #c_literal{val=exact}.
@@ -2603,7 +2617,11 @@ format_error(nomatch) ->
format_error(bad_binary) ->
"binary construction will fail because of a type mismatch";
format_error(badmap) ->
- "map construction will fail because of a type mismatch".
+ "map construction will fail because of a type mismatch";
+format_error({map_key_repeated,Key}) when is_atom(Key) ->
+ io_lib:format("key '~w' will be overridden in expression", [Key]);
+format_error({map_key_repeated,Key}) ->
+ io_lib:format("key ~p will be overridden in expression", [Key]).
add_warning(Anno, Term, #core{ws=Ws,file=[{file,File}]}=St) ->
case erl_anno:generated(Anno) of
diff --git a/lib/compiler/test/warnings_SUITE.erl b/lib/compiler/test/warnings_SUITE.erl
index 72ead22191..7c27750556 100644
--- a/lib/compiler/test/warnings_SUITE.erl
+++ b/lib/compiler/test/warnings_SUITE.erl
@@ -628,7 +628,112 @@ maps(Config) when is_list(Config) ->
id(I) -> I.
">>,
[],
- []}],
+ []},
+ {repeated_keys1,
+ <<"
+ foo1() ->
+ #{a=>1,
+ b=> 2,
+ a=>3}.
+
+ bar1(M) ->
+ M#{a=>1, b=> 2, a:=3}.
+
+ baz1(M) ->
+ M#{a=>1, b=> 2, a:=3}.
+
+ foo2() ->
+ #{\"a\"=>1, \"b\"=> 2, \"a\"=>3}.
+
+ bar2(M) ->
+ M#{\"a\"=>1, \"b\"=> 2, \"a\":=3}.
+
+ baz2(M) ->
+ M#{\"a\"=>1, \"b\"=> 2, \"a\":=3}.
+
+ foo3() ->
+ #{\"a\"=>1,
+ \"b\"=> 2,
+ \"a\"=>3}.
+
+ bar3(M) ->
+ M#{\"a\"=>1, \"b\"=> 2, \"a\":=3}.
+
+ baz3(M) ->
+ M#{<<\"a\">>=>1, <<\"b\">>=> 2, <<\"a\">>:=3}.
+ ">>,
+ [],
+ {warnings,[{3,v3_core,{map_key_repeated,a}},
+ {8,v3_core,{map_key_repeated,a}},
+ {11,v3_core,{map_key_repeated,a}},
+ {14,v3_core,{map_key_repeated,"a"}},
+ {17,v3_core,{map_key_repeated,"a"}},
+ {20,v3_core,{map_key_repeated,"a"}},
+ {23,v3_core,{map_key_repeated,"a"}},
+ {28,v3_core,{map_key_repeated,"a"}},
+ {31,v3_core,{map_key_repeated,<<"a">>}}]}},
+ {repeated_keys2,
+ <<"
+ foo4(K) ->
+ #{\"a\"=>1, K => 1, \"b\"=> 2, \"a\"=>3, K=>2}.
+
+ bar4(M,K) ->
+ M#{a=>1, K =>1, b=> 2, a:=3, K=>2}.
+
+ baz4(M,K) ->
+ M#{<<\"a\">>=>1,
+ K => 1, <<\"b\">>=> 2,
+ <<\"a\">>:=3, K=>2}.
+
+ foo5(K) ->
+ #{{\"a\",1}=>1, K => 1, \"b\"=> 2, {\"a\",1}=>3, K=>2}.
+
+ bar5(M,K) ->
+ M#{{\"a\",<<\"b\">>}=>1, K =>1,
+ \"b\"=> 2, {\"a\",<<\"b\">>}:=3, K=>2}.
+
+ baz5(M,K) ->
+ M#{{<<\"a\">>,1}=>1, K => 1,
+ <<\"b\">>=> 2, {<<\"a\">>,1}:=3,K=>2}.
+
+ foo6(K) ->
+ #{#{\"a\"=>1}=>1, K => 1, \"b\"=> 2, #{\"a\"=>1}=>3, K=>2}.
+
+ bar6(M,K) ->
+ M#{#{\"a\"=><<\"b\">>}=>1, K =>1,
+ \"b\"=> 2, #{\"a\"=><<\"b\">>}:=3, K=>2}.
+
+ baz6(M,K) ->
+ M#{#{<<\"a\">>=>1}=>1,
+ K => 1,
+ <<\"b\">>=> 2,
+ #{<<\"a\">>=>1}:=3,K=>2}.
+
+ foo7(K) ->
+ M1 = #{#{\"a\"=>1}=>1, K => 1, \"b\"=> 2},
+ M1#{#{\"a\"=>1}=>3, K=>2}.
+
+ bar7(M,K) ->
+ M1 = M#{#{\"a\"=><<\"b\">>}=>1, K =>1, \"b\"=> 2},
+ M1#{#{\"a\"=><<\"b\">>}:=3, K=>2}.
+
+ baz7(M,K) ->
+ M1 = M#{#{<<\"a\">>=>1}=>1,
+ K => 1,
+ <<\"b\">>=> 2},
+ M1#{#{<<\"a\">>=>1}:=3,K=>2}.
+ ">>,
+ [],
+ {warnings,[{3,v3_core,{map_key_repeated,"a"}},
+ {6,v3_core,{map_key_repeated,a}},
+ {9,v3_core,{map_key_repeated,<<"a">>}},
+ {14,v3_core,{map_key_repeated,{"a",1}}},
+ {17,v3_core,{map_key_repeated,{"a",<<"b">>}}},
+ {21,v3_core,{map_key_repeated,{<<"a">>,1}}},
+ {25,v3_core,{map_key_repeated,#{"a" => 1}}},
+ {28,v3_core,{map_key_repeated,#{"a" => <<"b">>}}},
+ {32,v3_core,{map_key_repeated,#{<<"a">> => 1}}}]}}
+ ],
run(Config, Ts),
ok.