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-rw-r--r--erts/emulator/test/bif_SUITE.erl71
1 files changed, 70 insertions, 1 deletions
diff --git a/erts/emulator/test/bif_SUITE.erl b/erts/emulator/test/bif_SUITE.erl
index 1255ff3c38..90c89cc12b 100644
--- a/erts/emulator/test/bif_SUITE.erl
+++ b/erts/emulator/test/bif_SUITE.erl
@@ -26,6 +26,7 @@
init_per_testcase/2,end_per_testcase/2,
display/1, display_huge/0,
erl_bif_types/1,guard_bifs_in_erl_bif_types/1,
+ shadow_comments/1,
specs/1,improper_bif_stubs/1,auto_imports/1,
t_list_to_existing_atom/1,os_env/1,otp_7526/1,
binary_to_atom/1,binary_to_existing_atom/1,
@@ -34,7 +35,7 @@
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
- [erl_bif_types, guard_bifs_in_erl_bif_types,
+ [erl_bif_types, guard_bifs_in_erl_bif_types, shadow_comments,
specs, improper_bif_stubs, auto_imports,
t_list_to_existing_atom, os_env, otp_7526,
display,
@@ -162,6 +163,74 @@ guard_bifs_in_erl_bif_types(_Config) ->
?t:fail()
end.
+shadow_comments(_Config) ->
+ ensure_erl_bif_types_compiled(),
+
+ List0 = erlang:system_info(snifs),
+ List1 = [MFA || {M,_,_}=MFA <- List0, M =/= hipe_bifs],
+ List = [MFA || MFA <- List1, not is_operator(MFA)],
+ HasTypes = [MFA || {M,F,A}=MFA <- List,
+ erl_bif_types:is_known(M, F, A)],
+ Path = get_code_path(),
+ BifRel = sofs:relation(HasTypes, [{m,f,a}]),
+ BifModules = sofs:to_external(sofs:projection(1, BifRel)),
+ AbstrByModule = [extract_abstract(Mod, Path) || Mod <- BifModules],
+ Specs0 = [extract_specs(Mod, Abstr) ||
+ {Mod,Abstr} <- AbstrByModule],
+ Specs = lists:append(Specs0),
+ SpecFuns0 = [F || {F,_} <- Specs],
+ SpecFuns = sofs:relation(SpecFuns0, [{m,f,a}]),
+ HasTypesAndSpecs = sofs:intersection(BifRel, SpecFuns),
+ Commented0 = lists:append([extract_comments(Mod, Path) ||
+ Mod <- BifModules]),
+ Commented = sofs:relation(Commented0, [{m,f,a}]),
+ {NoComments0,_,NoBifSpecs0} =
+ sofs:symmetric_partition(HasTypesAndSpecs, Commented),
+ NoComments = sofs:to_external(NoComments0),
+ NoBifSpecs = sofs:to_external(NoBifSpecs0),
+
+ case NoComments of
+ [] ->
+ ok;
+ [_|_] ->
+ io:put_chars(
+ ["If a BIF stub has both a spec and has type information in "
+ "erl_bif_types, there *must*\n"
+ "be a comment in the source file to make that immediately "
+ "obvious.\n\nThe following comments are missing:\n\n",
+ [io_lib:format("%% Shadowed by erl_bif_types: ~p:~p/~p\n",
+ [M,F,A]) || {M,F,A} <- NoComments]]),
+ ?t:fail()
+ end,
+
+ case NoBifSpecs of
+ [] ->
+ ok;
+ [_|_] ->
+ io:put_chars(
+ ["The following functions have \"shadowed\" comments "
+ "claiming that there is type information in erl_bif_types,\n"
+ "but actually there is no such type information.\n\n"
+ "Therefore, the following comments should be removed:\n\n",
+ [io_lib:format("%% Shadowed by erl_bif_types: ~p:~p/~p\n",
+ [M,F,A]) || {M,F,A} <- NoBifSpecs]]),
+ ?t:fail()
+ end.
+
+extract_comments(Mod, Path) ->
+ Beam = which(Mod, Path),
+ SrcDir = filename:join(filename:dirname(filename:dirname(Beam)), "src"),
+ Src = filename:join(SrcDir, atom_to_list(Mod) ++ ".erl"),
+ {ok,Bin} = file:read_file(Src),
+ Lines0 = binary:split(Bin, <<"\n">>, [global]),
+ Lines1 = [T || <<"%% Shadowed by erl_bif_types: ",T/binary>> <- Lines0],
+ {ok,ReMFA} = re:compile("([^:]*):([^/]*)/(\\d*)"),
+ Lines = [L || L <- Lines1, re:run(L, ReMFA, [{capture,[]}]) =:= match],
+ [begin
+ {match,[M,F,A]} = re:run(L, ReMFA, [{capture,all_but_first,list}]),
+ {list_to_atom(M),list_to_atom(F),list_to_integer(A)}
+ end || L <- Lines].
+
ensure_erl_bif_types_compiled() ->
c:l(erl_bif_types),
case erlang:function_exported(erl_bif_types, module_info, 0) of