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authorBjörn Gustavsson <[email protected]>2012-01-17 15:27:26 +0100
committerBjörn Gustavsson <[email protected]>2012-01-17 18:00:21 +0100
commite3b658cbc9b5838ed2596cc30790c26bfa90953f (patch)
tree832eed48aa35e345cee7e17edbe7245a0eecdbc2 /lib/stdlib
parentf8815dc88bd86d6508d2a3dad031ea939fb2b443 (diff)
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erl_lint: Consistently reject local calls from guards
If a guard test (such as is_list/1) has a local definition in a module (or is imported), erl_lint will reject a call to it from a guard if the call is not at the top-level: foo(L) when is_list(L) =:= true -> %% Will be rejected. ok. is_list(_) -> ok. But if the call is at the top-level, it will be accepted (and cause a crash in a later compiler pass): foo(L) when is_list(L) -> %% Will be accepted by erl_lint ok. is_list(_) -> ok. This inconsistency was an oversight introduced when it became possible to override BIFs with local definitions.
Diffstat (limited to 'lib/stdlib')
-rw-r--r--lib/stdlib/src/erl_lint.erl13
-rw-r--r--lib/stdlib/test/erl_lint_SUITE.erl19
2 files changed, 28 insertions, 4 deletions
diff --git a/lib/stdlib/src/erl_lint.erl b/lib/stdlib/src/erl_lint.erl
index e5adb84932..2f29954dc9 100644
--- a/lib/stdlib/src/erl_lint.erl
+++ b/lib/stdlib/src/erl_lint.erl
@@ -1804,12 +1804,19 @@ guard_test(G, Vt, St0) ->
%% Specially handle record type test here.
guard_test2({call,Line,{atom,Lr,record},[E,A]}, Vt, St0) ->
gexpr({call,Line,{atom,Lr,is_record},[E,A]}, Vt, St0);
-guard_test2({call,_Line,{atom,_La,F},As}=G, Vt, St0) ->
+guard_test2({call,Line,{atom,_La,F},As}=G, Vt, St0) ->
{Asvt,St1} = gexpr_list(As, Vt, St0), %Always check this.
A = length(As),
case erl_internal:type_test(F, A) of
- true when F =/= is_record -> {Asvt,St1};
- _ -> gexpr(G, Vt, St0)
+ true when F =/= is_record ->
+ case no_guard_bif_clash(St1, {F,A}) of
+ false ->
+ {Asvt,add_error(Line, {illegal_guard_local_call,{F,A}}, St1)};
+ true ->
+ {Asvt,St1}
+ end;
+ _ ->
+ gexpr(G, Vt, St0)
end;
guard_test2(G, Vt, St) ->
%% Everything else is a guard expression.
diff --git a/lib/stdlib/test/erl_lint_SUITE.erl b/lib/stdlib/test/erl_lint_SUITE.erl
index 9041adbe5c..e4c7fd5b02 100644
--- a/lib/stdlib/test/erl_lint_SUITE.erl
+++ b/lib/stdlib/test/erl_lint_SUITE.erl
@@ -2631,7 +2631,24 @@ bif_clash(Config) when is_list(Config) ->
binary_part(A,B,C).
">>,
[warn_unused_import],
- {warnings,[{2,erl_lint,{redefine_bif_import,{binary_part,3}}}]}}
+ {warnings,[{2,erl_lint,{redefine_bif_import,{binary_part,3}}}]}},
+ %% Don't accept call to a guard BIF if there is a local definition
+ %% or an import with the same name.
+ {clash21,
+ <<"-export([is_list/1]).
+ -import(x, [is_tuple/1]).
+ x(T) when is_tuple(T) -> ok;
+ x(T) when is_list(T) -> ok.
+ y(T) when is_tuple(T) =:= true -> ok;
+ y(T) when is_list(T) =:= true -> ok.
+ is_list(_) ->
+ ok.
+ ">>,
+ [{no_auto_import,[{is_tuple,1}]}],
+ {errors,[{3,erl_lint,{illegal_guard_local_call,{is_tuple,1}}},
+ {4,erl_lint,{illegal_guard_local_call,{is_list,1}}},
+ {5,erl_lint,{illegal_guard_local_call,{is_tuple,1}}},
+ {6,erl_lint,{illegal_guard_local_call,{is_list,1}}}],[]}}
],
?line [] = run(Config, Ts),