diff options
Diffstat (limited to 'lib/stdlib/src/erl_lint.erl')
| -rw-r--r-- | lib/stdlib/src/erl_lint.erl | 676 |
1 files changed, 456 insertions, 220 deletions
diff --git a/lib/stdlib/src/erl_lint.erl b/lib/stdlib/src/erl_lint.erl index c4cb5fdc80..9cd4727dc3 100644 --- a/lib/stdlib/src/erl_lint.erl +++ b/lib/stdlib/src/erl_lint.erl @@ -2,7 +2,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1996-2015. All Rights Reserved. +%% Copyright Ericsson AB 1996-2017. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. @@ -27,16 +27,12 @@ -export([module/1,module/2,module/3,format_error/1]). -export([exprs/2,exprs_opt/3,used_vars/2]). % Used from erl_eval.erl. --export([is_pattern_expr/1,is_guard_test/1,is_guard_test/2]). +-export([is_pattern_expr/1,is_guard_test/1,is_guard_test/2,is_guard_test/3]). -export([is_guard_expr/1]). -export([bool_option/4,value_option/3,value_option/7]). --export([modify_line/2]). - -import(lists, [member/2,map/2,foldl/3,foldr/3,mapfoldl/3,all/2,reverse/1]). --deprecated([{modify_line, 2, next_major_release}]). - %% bool_option(OnOpt, OffOpt, Default, Options) -> boolean(). %% value_option(Flag, Default, Options) -> Value. %% value_option(Flag, Default, OnOpt, OnVal, OffOpt, OffVal, Options) -> @@ -79,7 +75,7 @@ value_option(Flag, Default, On, OnVal, Off, OffVal, Opts) -> %%-define(DEBUGF(X,Y), io:format(X, Y)). -define(DEBUGF(X,Y), void). --type line() :: erl_anno:line(). % a convenient alias +-type line() :: erl_anno:anno(). % a convenient alias -type fa() :: {atom(), arity()}. % function+arity -type ta() :: {atom(), arity()}. % type+arity @@ -96,14 +92,22 @@ value_option(Flag, Default, On, OnVal, Off, OffVal, Opts) -> :: dict:dict(ta(), line()) }). + +%% Are we outside or inside a catch or try/catch? +-type catch_scope() :: 'none' + | 'after_old_catch' + | 'after_try' + | 'wrong_part_of_try' + | 'try_catch'. + %% Define the lint state record. %% 'called' and 'exports' contain {Line, {Function, Arity}}, %% the other function collections contain {Function, Arity}. -record(lint, {state=start :: 'start' | 'attribute' | 'function', - module=[], %Module + module='', %Module behaviour=[], %Behaviour exports=gb_sets:empty() :: gb_sets:set(fa()),%Exports - imports=[] :: [fa()], %Imports, an orddict() + imports=[] :: orddict:orddict(fa(), module()),%Imports compile=[], %Compile flags records=dict:new() %Record definitions :: dict:dict(atom(), {line(),Fields :: term()}), @@ -139,7 +143,9 @@ value_option(Flag, Default, On, OnVal, Off, OffVal, Opts) -> types = dict:new() %Type definitions :: dict:dict(ta(), #typeinfo{}), exp_types=gb_sets:empty() %Exported types - :: gb_sets:set(ta()) + :: gb_sets:set(ta()), + catch_scope = none %Inside/outside try or catch + :: catch_scope() }). -type lint_state() :: #lint{}. @@ -160,6 +166,8 @@ format_error(pmod_unsupported) -> "parameterized modules are no longer supported"; %% format_error({redefine_mod_import, M, P}) -> %% io_lib:format("module '~s' already imported from package '~s'", [M, P]); +format_error(non_latin1_module_unsupported) -> + "module names with non-latin1 characters are not supported"; format_error(invalid_call) -> "invalid function call"; @@ -167,49 +175,48 @@ format_error(invalid_record) -> "invalid record expression"; format_error({attribute,A}) -> - io_lib:format("attribute '~w' after function definitions", [A]); + io_lib:format("attribute ~tw after function definitions", [A]); format_error({missing_qlc_hrl,A}) -> io_lib:format("qlc:q/~w called, but \"qlc.hrl\" not included", [A]); format_error({redefine_import,{{F,A},M}}) -> - io_lib:format("function ~w/~w already imported from ~w", [F,A,M]); + io_lib:format("function ~tw/~w already imported from ~w", [F,A,M]); format_error({bad_inline,{F,A}}) -> - io_lib:format("inlined function ~w/~w undefined", [F,A]); + io_lib:format("inlined function ~tw/~w undefined", [F,A]); format_error({invalid_deprecated,D}) -> - io_lib:format("badly formed deprecated attribute ~w", [D]); + io_lib:format("badly formed deprecated attribute ~tw", [D]); format_error({bad_deprecated,{F,A}}) -> - io_lib:format("deprecated function ~w/~w undefined or not exported", [F,A]); + io_lib:format("deprecated function ~tw/~w undefined or not exported", + [F,A]); format_error({bad_nowarn_unused_function,{F,A}}) -> - io_lib:format("function ~w/~w undefined", [F,A]); + io_lib:format("function ~tw/~w undefined", [F,A]); format_error({bad_nowarn_bif_clash,{F,A}}) -> - io_lib:format("function ~w/~w undefined", [F,A]); + io_lib:format("function ~tw/~w undefined", [F,A]); format_error(disallowed_nowarn_bif_clash) -> io_lib:format("compile directive nowarn_bif_clash is no longer allowed,~n" " - use explicit module names or -compile({no_auto_import, [F/A]})", []); -format_error({bad_nowarn_deprecated_function,{M,F,A}}) -> - io_lib:format("~w:~w/~w is not a deprecated function", [M,F,A]); format_error({bad_on_load,Term}) -> - io_lib:format("badly formed on_load attribute: ~w", [Term]); + io_lib:format("badly formed on_load attribute: ~tw", [Term]); format_error(multiple_on_loads) -> "more than one on_load attribute"; format_error({bad_on_load_arity,{F,A}}) -> - io_lib:format("function ~w/~w has wrong arity (must be 0)", [F,A]); + io_lib:format("function ~tw/~w has wrong arity (must be 0)", [F,A]); format_error({undefined_on_load,{F,A}}) -> - io_lib:format("function ~w/~w undefined", [F,A]); + io_lib:format("function ~tw/~w undefined", [F,A]); format_error(export_all) -> "export_all flag enabled - all functions will be exported"; format_error({duplicated_export, {F,A}}) -> - io_lib:format("function ~w/~w already exported", [F,A]); + io_lib:format("function ~tw/~w already exported", [F,A]); format_error({unused_import,{{F,A},M}}) -> - io_lib:format("import ~w:~w/~w is unused", [M,F,A]); + io_lib:format("import ~w:~tw/~w is unused", [M,F,A]); format_error({undefined_function,{F,A}}) -> - io_lib:format("function ~w/~w undefined", [F,A]); + io_lib:format("function ~tw/~w undefined", [F,A]); format_error({redefine_function,{F,A}}) -> - io_lib:format("function ~w/~w already defined", [F,A]); + io_lib:format("function ~tw/~w already defined", [F,A]); format_error({define_import,{F,A}}) -> - io_lib:format("defining imported function ~w/~w", [F,A]); + io_lib:format("defining imported function ~tw/~w", [F,A]); format_error({unused_function,{F,A}}) -> - io_lib:format("function ~w/~w is unused", [F,A]); + io_lib:format("function ~tw/~w is unused", [F,A]); format_error({call_to_redefined_bif,{F,A}}) -> io_lib:format("ambiguous call of overridden auto-imported BIF ~w/~w~n" " - use erlang:~w/~w or \"-compile({no_auto_import,[~w/~w]}).\" " @@ -225,7 +232,15 @@ format_error({redefine_old_bif_import,{F,A}}) -> format_error({redefine_bif_import,{F,A}}) -> io_lib:format("import directive overrides auto-imported BIF ~w/~w~n" " - use \"-compile({no_auto_import,[~w/~w]}).\" to resolve name clash", [F,A,F,A]); - +format_error({get_stacktrace,wrong_part_of_try}) -> + "erlang:get_stacktrace/0 used in the wrong part of 'try' expression. " + "(Use it in the block between 'catch' and 'end'.)"; +format_error({get_stacktrace,after_old_catch}) -> + "erlang:get_stacktrace/0 used following an old-style 'catch' " + "may stop working in a future release. (Use it inside 'try'.)"; +format_error({get_stacktrace,after_try}) -> + "erlang:get_stacktrace/0 used following a 'try' expression " + "may stop working in a future release. (Use it inside 'try'.)"; format_error({deprecated, MFA, ReplacementMFA, Rel}) -> io_lib:format("~s is deprecated and will be removed in ~s; use ~s", [format_mfa(MFA), Rel, format_mfa(ReplacementMFA)]); @@ -238,8 +253,15 @@ format_error({removed, MFA, ReplacementMFA, Rel}) -> "use ~s", [format_mfa(MFA), Rel, format_mfa(ReplacementMFA)]); format_error({removed, MFA, String}) when is_list(String) -> io_lib:format("~s: ~s", [format_mfa(MFA), String]); +format_error({removed_type, MNA, ReplacementMNA, Rel}) -> + io_lib:format("the type ~s was removed in ~s; use ~s instead", + [format_mna(MNA), Rel, format_mna(ReplacementMNA)]); format_error({obsolete_guard, {F, A}}) -> - io_lib:format("~p/~p obsolete", [F, A]); + io_lib:format("~p/~p obsolete (use is_~p/~p)", [F, A, F, A]); +format_error({obsolete_guard_overridden,Test}) -> + io_lib:format("obsolete ~s/1 (meaning is_~s/1) is illegal when " + "there is a local/imported function named is_~p/1 ", + [Test,Test,Test]); format_error({too_many_arguments,Arity}) -> io_lib:format("too many arguments (~w) - " "maximum allowed is ~w", [Arity,?MAX_ARGUMENTS]); @@ -250,7 +272,7 @@ format_error(illegal_bin_pattern) -> "binary patterns cannot be matched in parallel using '='"; format_error(illegal_expr) -> "illegal expression"; format_error({illegal_guard_local_call, {F,A}}) -> - io_lib:format("call to local/imported function ~w/~w is illegal in guard", + io_lib:format("call to local/imported function ~tw/~w is illegal in guard", [F,A]); format_error(illegal_guard_expr) -> "illegal guard expression"; %% --- maps --- @@ -258,23 +280,23 @@ format_error(illegal_map_construction) -> "only association operators '=>' are allowed in map construction"; %% --- records --- format_error({undefined_record,T}) -> - io_lib:format("record ~w undefined", [T]); + io_lib:format("record ~tw undefined", [T]); format_error({redefine_record,T}) -> - io_lib:format("record ~w already defined", [T]); + io_lib:format("record ~tw already defined", [T]); format_error({redefine_field,T,F}) -> - io_lib:format("field ~w already defined in record ~w", [F,T]); + io_lib:format("field ~tw already defined in record ~tw", [F,T]); format_error({undefined_field,T,F}) -> - io_lib:format("field ~w undefined in record ~w", [F,T]); + io_lib:format("field ~tw undefined in record ~tw", [F,T]); format_error(illegal_record_info) -> "illegal record info"; format_error({field_name_is_variable,T,F}) -> - io_lib:format("field ~w is not an atom or _ in record ~w", [F,T]); + io_lib:format("field ~tw is not an atom or _ in record ~tw", [F,T]); format_error({wildcard_in_update,T}) -> - io_lib:format("meaningless use of _ in update of record ~w", [T]); + io_lib:format("meaningless use of _ in update of record ~tw", [T]); format_error({unused_record,T}) -> - io_lib:format("record ~w is unused", [T]); + io_lib:format("record ~tw is unused", [T]); format_error({untyped_record,T}) -> - io_lib:format("record ~w has field(s) without type information", [T]); + io_lib:format("record ~tw has field(s) without type information", [T]); %% --- variables ---- format_error({unbound_var,V}) -> io_lib:format("variable ~w is unbound", [V]); @@ -292,7 +314,10 @@ format_error({variable_in_record_def,V}) -> io_lib:format("variable ~w in record definition", [V]); %% --- binaries --- format_error({undefined_bittype,Type}) -> - io_lib:format("bit type ~w undefined", [Type]); + io_lib:format("bit type ~tw undefined", [Type]); +format_error({bittype_mismatch,Val1,Val2,What}) -> + io_lib:format("conflict in ~s specification for bit field: '~p' and '~p'", + [What,Val1,Val2]); format_error(bittype_unit) -> "a bit unit size must not be specified unless a size is specified too"; format_error(illegal_bitsize) -> @@ -309,13 +334,13 @@ format_error(unsized_binary_in_bin_gen_pattern) -> "binary fields without size are not allowed in patterns of bit string generators"; %% --- behaviours --- format_error({conflicting_behaviours,{Name,Arity},B,FirstL,FirstB}) -> - io_lib:format("conflicting behaviours - callback ~w/~w required by both '~p' " + io_lib:format("conflicting behaviours - callback ~tw/~w required by both '~p' " "and '~p' ~s", [Name,Arity,B,FirstB,format_where(FirstL)]); format_error({undefined_behaviour_func, {Func,Arity}, Behaviour}) -> - io_lib:format("undefined callback function ~w/~w (behaviour '~w')", + io_lib:format("undefined callback function ~tw/~w (behaviour '~w')", [Func,Arity,Behaviour]); format_error({undefined_behaviour,Behaviour}) -> - io_lib:format("behaviour ~w undefined", [Behaviour]); + io_lib:format("behaviour ~tw undefined", [Behaviour]); format_error({undefined_behaviour_callbacks,Behaviour}) -> io_lib:format("behaviour ~w callback functions are undefined", [Behaviour]); @@ -326,23 +351,23 @@ format_error({ill_defined_optional_callbacks,Behaviour}) -> io_lib:format("behaviour ~w optional callback functions erroneously defined", [Behaviour]); format_error({behaviour_info, {_M,F,A}}) -> - io_lib:format("cannot define callback attibute for ~w/~w when " + io_lib:format("cannot define callback attibute for ~tw/~w when " "behaviour_info is defined",[F,A]); format_error({redefine_optional_callback, {F, A}}) -> - io_lib:format("optional callback ~w/~w duplicated", [F, A]); + io_lib:format("optional callback ~tw/~w duplicated", [F, A]); format_error({undefined_callback, {_M, F, A}}) -> - io_lib:format("callback ~w/~w is undefined", [F, A]); + io_lib:format("callback ~tw/~w is undefined", [F, A]); %% --- types and specs --- format_error({singleton_typevar, Name}) -> io_lib:format("type variable ~w is only used once (is unbound)", [Name]); format_error({bad_export_type, _ETs}) -> io_lib:format("bad export_type declaration", []); format_error({duplicated_export_type, {T, A}}) -> - io_lib:format("type ~w/~w already exported", [T, A]); + io_lib:format("type ~tw/~w already exported", [T, A]); format_error({undefined_type, {TypeName, Arity}}) -> - io_lib:format("type ~w~s undefined", [TypeName, gen_type_paren(Arity)]); + io_lib:format("type ~tw~s undefined", [TypeName, gen_type_paren(Arity)]); format_error({unused_type, {TypeName, Arity}}) -> - io_lib:format("type ~w~s is unused", [TypeName, gen_type_paren(Arity)]); + io_lib:format("type ~tw~s is unused", [TypeName, gen_type_paren(Arity)]); format_error({new_builtin_type, {TypeName, Arity}}) -> io_lib:format("type ~w~s is a new builtin type; " "its (re)definition is allowed only until the next release", @@ -354,26 +379,30 @@ format_error({renamed_type, OldName, NewName}) -> io_lib:format("type ~w() is now called ~w(); " "please use the new name instead", [OldName, NewName]); format_error({redefine_type, {TypeName, Arity}}) -> - io_lib:format("type ~w~s already defined", + io_lib:format("type ~tw~s already defined", [TypeName, gen_type_paren(Arity)]); format_error({type_syntax, Constr}) -> - io_lib:format("bad ~w type", [Constr]); + io_lib:format("bad ~tw type", [Constr]); +format_error(old_abstract_code) -> + io_lib:format("abstract code generated before Erlang/OTP 19.0 and " + "having typed record fields cannot be compiled", []); format_error({redefine_spec, {M, F, A}}) -> - io_lib:format("spec for ~w:~w/~w already defined", [M, F, A]); + io_lib:format("spec for ~tw:~tw/~w already defined", [M, F, A]); format_error({redefine_spec, {F, A}}) -> - io_lib:format("spec for ~w/~w already defined", [F, A]); + io_lib:format("spec for ~tw/~w already defined", [F, A]); format_error({redefine_callback, {F, A}}) -> - io_lib:format("callback ~w/~w already defined", [F, A]); + io_lib:format("callback ~tw/~w already defined", [F, A]); format_error({bad_callback, {M, F, A}}) -> - io_lib:format("explicit module not allowed for callback ~w:~w/~w ", [M, F, A]); + io_lib:format("explicit module not allowed for callback ~tw:~tw/~w", + [M, F, A]); format_error({spec_fun_undefined, {F, A}}) -> - io_lib:format("spec for undefined function ~w/~w", [F, A]); + io_lib:format("spec for undefined function ~tw/~w", [F, A]); format_error({missing_spec, {F,A}}) -> - io_lib:format("missing specification for function ~w/~w", [F, A]); + io_lib:format("missing specification for function ~tw/~w", [F, A]); format_error(spec_wrong_arity) -> - "spec has the wrong arity"; + "spec has wrong arity"; format_error(callback_wrong_arity) -> - "callback has the wrong arity"; + "callback has wrong arity"; format_error({deprecated_builtin_type, {Name, Arity}, Replacement, Rel}) -> UseS = case Replacement of @@ -388,11 +417,15 @@ format_error({deprecated_builtin_type, {Name, Arity}, "removed in ~s; use ~s", [Name, Arity, Rel, UseS]); format_error({not_exported_opaque, {TypeName, Arity}}) -> - io_lib:format("opaque type ~w~s is not exported", + io_lib:format("opaque type ~tw~s is not exported", [TypeName, gen_type_paren(Arity)]); format_error({underspecified_opaque, {TypeName, Arity}}) -> - io_lib:format("opaque type ~w~s is underspecified and therefore meaningless", + io_lib:format("opaque type ~tw~s is underspecified and therefore meaningless", [TypeName, gen_type_paren(Arity)]); +format_error({bad_dialyzer_attribute,Term}) -> + io_lib:format("badly formed dialyzer attribute: ~tw", [Term]); +format_error({bad_dialyzer_option,Term}) -> + io_lib:format("unknown dialyzer warning option: ~tw", [Term]); %% --- obsolete? unused? --- format_error({format_error, {Fmt, Args}}) -> io_lib:format(Fmt, Args). @@ -413,6 +446,9 @@ format_mfa({M, F, A}) when is_integer(A) -> format_mf(M, F, ArityString) when is_atom(M), is_atom(F) -> atom_to_list(M) ++ ":" ++ atom_to_list(F) ++ "/" ++ ArityString. +format_mna({M, N, A}) when is_integer(A) -> + atom_to_list(M) ++ ":" ++ atom_to_list(N) ++ gen_type_paren(A). + format_where(L) when is_integer(L) -> io_lib:format("(line ~p)", [L]); format_where({L,C}) when is_integer(L), is_integer(C) -> @@ -459,7 +495,7 @@ used_vars(Exprs, BindingsList) -> %% really all ordsets! -spec(module(AbsForms) -> {ok, Warnings} | {error, Errors, Warnings} when - AbsForms :: [erl_parse:abstract_form()], + AbsForms :: [erl_parse:abstract_form() | erl_parse:form_info()], Warnings :: [{file:filename(),[ErrorInfo]}], Errors :: [{FileName2 :: file:filename(),[ErrorInfo]}], ErrorInfo :: error_info()). @@ -471,7 +507,7 @@ module(Forms) -> -spec(module(AbsForms, FileName) -> {ok, Warnings} | {error, Errors, Warnings} when - AbsForms :: [erl_parse:abstract_form()], + AbsForms :: [erl_parse:abstract_form() | erl_parse:form_info()], FileName :: atom() | string(), Warnings :: [{file:filename(),[ErrorInfo]}], Errors :: [{FileName2 :: file:filename(),[ErrorInfo]}], @@ -484,7 +520,7 @@ module(Forms, FileName) -> -spec(module(AbsForms, FileName, CompileOptions) -> {ok, Warnings} | {error, Errors, Warnings} when - AbsForms :: [erl_parse:abstract_form()], + AbsForms :: [erl_parse:abstract_form() | erl_parse:form_info()], FileName :: atom() | string(), CompileOptions :: [compile:option()], Warnings :: [{file:filename(),[ErrorInfo]}], @@ -514,7 +550,7 @@ start(File, Opts) -> true, Opts)}, {export_all, bool_option(warn_export_all, nowarn_export_all, - false, Opts)}, + true, Opts)}, {export_vars, bool_option(warn_export_vars, nowarn_export_vars, false, Opts)}, @@ -550,7 +586,10 @@ start(File, Opts) -> false, Opts)}, {missing_spec_all, bool_option(warn_missing_spec_all, nowarn_missing_spec_all, - false, Opts)} + false, Opts)}, + {get_stacktrace, + bool_option(warn_get_stacktrace, nowarn_get_stacktrace, + true, Opts)} ], Enabled1 = [Category || {Category,true} <- Enabled0], Enabled = ordsets:from_list(Enabled1), @@ -691,7 +730,12 @@ set_form_file({function,L,N,A,C}, File) -> set_form_file(Form, _File) -> Form. +set_file(Ts, File) when is_list(Ts) -> + [anno_set_file(T, File) || T <- Ts]; set_file(T, File) -> + anno_set_file(T, File). + +anno_set_file(T, File) -> F = fun(Anno) -> erl_anno:set_file(File, Anno) end, erl_parse:map_anno(F, T). @@ -716,17 +760,23 @@ form(Form, #lint{state=State}=St) -> start_state({attribute,Line,module,{_,_}}=Form, St0) -> St1 = add_error(Line, pmod_unsupported, St0), attribute_state(Form, St1#lint{state=attribute}); -start_state({attribute,_,module,M}, St0) -> +start_state({attribute,Line,module,M}, St0) -> St1 = St0#lint{module=M}, - St1#lint{state=attribute}; + St2 = St1#lint{state=attribute}, + check_module_name(M, Line, St2); start_state(Form, St) -> - St1 = add_error(element(2, Form), undefined_module, St), + Anno = case Form of + {eof, L} -> erl_anno:new(L); + %% {warning, Warning} and {error, Error} not possible here. + _ -> element(2, Form) + end, + St1 = add_error(Anno, undefined_module, St), attribute_state(Form, St1#lint{state=attribute}). %% attribute_state(Form, State) -> %% State' -attribute_state({attribute,_L,module,_M}, #lint{module=[]}=St) -> +attribute_state({attribute,_L,module,_M}, #lint{module=''}=St) -> St; attribute_state({attribute,L,module,_M}, St) -> add_error(L, redefine_module, St); @@ -763,8 +813,7 @@ attribute_state(Form, St) -> %% State' %% Allow for record, type and opaque type definitions and spec %% declarations to be intersperced within function definitions. -%% Dialyzer attributes are also allowed everywhere, but are not -%% checked at all. +%% Dialyzer attributes are also allowed everywhere. function_state({attribute,L,record,{Name,Fields}}, St) -> record_def(L, Name, Fields, St); @@ -805,9 +854,10 @@ not_deprecated(Forms, St0) -> {nowarn_deprecated_function, MFAs0} <- lists:flatten([Args]), MFA <- lists:flatten([MFAs0])], Nowarn = [MFA || {MFA,_L} <- MFAsL], - Bad = [MFAL || {{M,F,A},_L}=MFAL <- MFAsL, - otp_internal:obsolete(M, F, A) =:= no], - St1 = func_line_warning(bad_nowarn_deprecated_function, Bad, St0), + ML = [{M,L} || {{M,_F,_A},L} <- MFAsL, is_atom(M)], + St1 = foldl(fun ({M,L}, St2) -> + check_module_name(M, L, St2) + end, St0, ML), St1#lint{not_deprecated = ordsets:from_list(Nowarn)}. %% The nowarn_bif_clash directive is not only deprecated, it's actually an error from R14A @@ -850,7 +900,8 @@ post_traversal_check(Forms, St0) -> StD = check_on_load(StC), StE = check_unused_records(Forms, StD), StF = check_local_opaque_types(StE), - check_callback_information(StF). + StG = check_dialyzer_attribute(Forms, StF), + check_callback_information(StG). %% check_behaviour(State0) -> State %% Check that the behaviour attribute is valid. @@ -914,7 +965,8 @@ behaviour_callbacks(Line, B, St0) -> catch _:_ -> St1 = add_warning(Line, {undefined_behaviour, B}, St0), - {[], [], St1} + St2 = check_module_name(B, Line, St1), + {[], [], St2} end. behaviour_missing_callbacks([{{Line,B},Bfs0,OBfs}|T], St0) -> @@ -1133,7 +1185,7 @@ check_untyped_records(Forms, St0) -> RecNames = dict:fetch_keys(St0#lint.records), %% these are the records with field(s) containing type info TRecNames = [Name || - {attribute,_,type,{{record,Name},Fields,_}} <- Forms, + {attribute,_,record,{Name,Fields}} <- Forms, lists:all(fun ({typed_record_field,_,_}) -> true; (_) -> false end, Fields)], @@ -1143,7 +1195,8 @@ check_untyped_records(Forms, St0) -> [] -> St; % exclude records with no fields [_|_] -> add_warning(L, {untyped_record, N}, St) end - end, St0, RecNames -- TRecNames); + end, St0, ordsets:subtract(ordsets:from_list(RecNames), + ordsets:from_list(TRecNames))); false -> St0 end. @@ -1251,7 +1304,8 @@ exports(#lint{compile = Opts, defined = Defs, exports = Es}) -> -type import() :: {module(), [fa()]} | module(). -spec import(line(), import(), lint_state()) -> lint_state(). -import(Line, {Mod,Fs}, St) -> +import(Line, {Mod,Fs}, St00) -> + St = check_module_name(Mod, Line, St00), Mfs = ordsets:from_list(Fs), case check_imports(Line, Mfs, St#lint.imports) of [] -> @@ -1367,8 +1421,9 @@ call_function(Line, F, A, #lint{usage=Usage0,called=Cd,func=Func,file=File}=St) %% function(Line, Name, Arity, Clauses, State) -> State. function(Line, Name, Arity, Cs, St0) -> - St1 = define_function(Line, Name, Arity, St0#lint{func={Name,Arity}}), - clauses(Cs, St1). + St1 = St0#lint{func={Name,Arity},catch_scope=none}, + St2 = define_function(Line, Name, Arity, St1), + clauses(Cs, St2). -spec define_function(line(), atom(), arity(), lint_state()) -> lint_state(). @@ -1488,7 +1543,7 @@ pattern({op,_Line,'++',{string,_Li,_S},R}, Vt, Old, Bvt, St) -> pattern({match,_Line,Pat1,Pat2}, Vt, Old, Bvt, St0) -> {Lvt,Bvt1,St1} = pattern(Pat1, Vt, Old, Bvt, St0), {Rvt,Bvt2,St2} = pattern(Pat2, Vt, Old, Bvt, St1), - St3 = reject_bin_alias(Pat1, Pat2, St2), + St3 = reject_invalid_alias(Pat1, Pat2, Vt, St2), {vtmerge_pat(Lvt, Rvt),vtmerge_pat(Bvt1,Bvt2),St3}; %% Catch legal constant expressions, including unary +,-. pattern(Pat, _Vt, _Old, _Bvt, St) -> @@ -1503,56 +1558,77 @@ pattern_list(Ps, Vt, Old, Bvt0, St) -> {vtmerge_pat(Pvt, Psvt),vtmerge_pat(Bvt,Bvt1),St1} end, {[],[],St}, Ps). -%% reject_bin_alias(Pat, Expr, St) -> St' + + +%% reject_invalid_alias(Pat, Expr, Vt, St) -> St' %% Reject aliases for binary patterns at the top level. +%% Reject aliases for maps patterns at the top level. +%% The variables table (Vt) are for maps checkking. -reject_bin_alias_expr({bin,_,_}=P, {match,_,P0,E}, St0) -> - St = reject_bin_alias(P, P0, St0), - reject_bin_alias_expr(P, E, St); -reject_bin_alias_expr({match,_,_,_}=P, {match,_,P0,E}, St0) -> - St = reject_bin_alias(P, P0, St0), - reject_bin_alias_expr(P, E, St); -reject_bin_alias_expr(_, _, St) -> St. +reject_invalid_alias_expr({bin,_,_}=P, {match,_,P0,E}, Vt, St0) -> + St = reject_invalid_alias(P, P0, Vt, St0), + reject_invalid_alias_expr(P, E, Vt, St); +reject_invalid_alias_expr({map,_,_}=P, {match,_,P0,E}, Vt, St0) -> + St = reject_invalid_alias(P, P0, Vt, St0), + reject_invalid_alias_expr(P, E, Vt, St); +reject_invalid_alias_expr({match,_,_,_}=P, {match,_,P0,E}, Vt, St0) -> + St = reject_invalid_alias(P, P0, Vt, St0), + reject_invalid_alias_expr(P, E, Vt, St); +reject_invalid_alias_expr(_, _, _, St) -> St. -%% reject_bin_alias(Pat1, Pat2, St) -> St' + +%% reject_invalid_alias(Pat1, Pat2, St) -> St' %% Aliases of binary patterns, such as <<A:8>> = <<B:4,C:4>> or even %% <<A:8>> = <<A:8>>, are not allowed. Traverse the patterns in parallel %% and generate an error if any binary aliases are found. %% We generate an error even if is obvious that the overall pattern can't %% possibly match, for instance, {a,<<A:8>>,c}={x,<<A:8>>} WILL generate an %% error. +%% Maps should reject unbound variables here. -reject_bin_alias({bin,Line,_}, {bin,_,_}, St) -> +reject_invalid_alias({bin,Line,_}, {bin,_,_}, _, St) -> add_error(Line, illegal_bin_pattern, St); -reject_bin_alias({cons,_,H1,T1}, {cons,_,H2,T2}, St0) -> - St = reject_bin_alias(H1, H2, St0), - reject_bin_alias(T1, T2, St); -reject_bin_alias({tuple,_,Es1}, {tuple,_,Es2}, St) -> - reject_bin_alias_list(Es1, Es2, St); -reject_bin_alias({record,_,Name1,Pfs1}, {record,_,Name2,Pfs2}, +reject_invalid_alias({map,_Line,Ps1}, {map,_,Ps2}, Vt, St0) -> + Fun = fun ({map_field_exact,L,{var,_,K},_V}, Sti) -> + case is_var_bound(K,Vt) of + true -> + Sti; + false -> + add_error(L, {unbound_var,K}, Sti) + end; + ({map_field_exact,_L,_K,_V}, Sti) -> + Sti + end, + foldl(Fun, foldl(Fun, St0, Ps1), Ps2); +reject_invalid_alias({cons,_,H1,T1}, {cons,_,H2,T2}, Vt, St0) -> + St = reject_invalid_alias(H1, H2, Vt, St0), + reject_invalid_alias(T1, T2, Vt, St); +reject_invalid_alias({tuple,_,Es1}, {tuple,_,Es2}, Vt, St) -> + reject_invalid_alias_list(Es1, Es2, Vt, St); +reject_invalid_alias({record,_,Name1,Pfs1}, {record,_,Name2,Pfs2}, Vt, #lint{records=Recs}=St) -> case {dict:find(Name1, Recs),dict:find(Name2, Recs)} of {{ok,{_Line1,Fields1}},{ok,{_Line2,Fields2}}} -> - reject_bin_alias_rec(Pfs1, Pfs2, Fields1, Fields2, St); + reject_invalid_alias_rec(Pfs1, Pfs2, Fields1, Fields2, Vt, St); {_,_} -> %% One or more non-existing records. (An error messages has %% already been generated, so we are done here.) St end; -reject_bin_alias({match,_,P1,P2}, P, St0) -> - St = reject_bin_alias(P1, P, St0), - reject_bin_alias(P2, P, St); -reject_bin_alias(P, {match,_,_,_}=M, St) -> - reject_bin_alias(M, P, St); -reject_bin_alias(_P1, _P2, St) -> St. - -reject_bin_alias_list([E1|Es1], [E2|Es2], St0) -> - St = reject_bin_alias(E1, E2, St0), - reject_bin_alias_list(Es1, Es2, St); -reject_bin_alias_list(_, _, St) -> St. - -reject_bin_alias_rec(PfsA0, PfsB0, FieldsA0, FieldsB0, St) -> +reject_invalid_alias({match,_,P1,P2}, P, Vt, St0) -> + St = reject_invalid_alias(P1, P, Vt, St0), + reject_invalid_alias(P2, P, Vt, St); +reject_invalid_alias(P, {match,_,_,_}=M, Vt, St) -> + reject_invalid_alias(M, P, Vt, St); +reject_invalid_alias(_P1, _P2, _Vt, St) -> St. + +reject_invalid_alias_list([E1|Es1], [E2|Es2], Vt, St0) -> + St = reject_invalid_alias(E1, E2, Vt, St0), + reject_invalid_alias_list(Es1, Es2, Vt, St); +reject_invalid_alias_list(_, _, _, St) -> St. + +reject_invalid_alias_rec(PfsA0, PfsB0, FieldsA0, FieldsB0, Vt, St) -> %% We treat records as if they have been converted to tuples. PfsA1 = rbia_field_vars(PfsA0), PfsB1 = rbia_field_vars(PfsB0), @@ -1568,7 +1644,7 @@ reject_bin_alias_rec(PfsA0, PfsB0, FieldsA0, FieldsB0, St) -> D = sofs:projection({external,fun({_,_,P1,_,P2}) -> {P1,P2} end}, C), E = sofs:to_external(D), {Ps1,Ps2} = lists:unzip(E), - reject_bin_alias_list(Ps1, Ps2, St). + reject_invalid_alias_list(Ps1, Ps2, Vt, St). rbia_field_vars(Fs) -> [{Name,Pat} || {record_field,_,{atom,_,Name},Pat} <- Fs]. @@ -1730,7 +1806,8 @@ bit_size({atom,_Line,all}, _Vt, St, _Check) -> {all,[],St}; bit_size(Size, Vt, St, Check) -> %% Try to safely evaluate Size if constant to get size, %% otherwise just treat it as an expression. - case is_gexpr(Size, St#lint.records) of + Info = is_guard_test2_info(St), + case is_gexpr(Size, Info) of true -> case erl_eval:partial_eval(Size) of {integer,_ILn,I} -> {I,[],St}; @@ -1965,77 +2042,104 @@ gexpr_list(Es, Vt, St) -> %% is_guard_test(Expression) -> boolean(). %% Test if a general expression is a guard test. +%% +%% Note: Only use this function in contexts where there can be +%% no definition of a local function that may override a guard BIF +%% (for example, in the shell). -spec is_guard_test(Expr) -> boolean() when Expr :: erl_parse:abstract_expr(). is_guard_test(E) -> - is_guard_test2(E, dict:new()). + is_guard_test2(E, {dict:new(),fun(_) -> false end}). %% is_guard_test(Expression, Forms) -> boolean(). is_guard_test(Expression, Forms) -> + is_guard_test(Expression, Forms, fun(_) -> false end). + + +%% is_guard_test(Expression, Forms, IsOverridden) -> boolean(). +%% Test if a general expression is a guard test. +%% +%% IsOverridden({Name,Arity}) should return 'true' if Name/Arity is +%% a local or imported function in the module. If the abstract code has +%% passed through erl_expand_records, any call without an explicit +%% module is to a local function, so IsOverridden can be defined as: +%% +%% fun(_) -> true end +%% +-spec is_guard_test(Expr, Forms, IsOverridden) -> boolean() when + Expr :: erl_parse:abstract_expr(), + Forms :: [erl_parse:abstract_form() | erl_parse:form_info()], + IsOverridden :: fun((fa()) -> boolean()). + +is_guard_test(Expression, Forms, IsOverridden) -> RecordAttributes = [A || A = {attribute, _, record, _D} <- Forms], St0 = foldl(fun(Attr0, St1) -> Attr = set_file(Attr0, "none"), attribute_state(Attr, St1) end, start(), RecordAttributes), - is_guard_test2(set_file(Expression, "nofile"), St0#lint.records). + is_guard_test2(set_file(Expression, "nofile"), + {St0#lint.records,IsOverridden}). %% is_guard_test2(Expression, RecordDefs :: dict:dict()) -> boolean(). -is_guard_test2({call,Line,{atom,Lr,record},[E,A]}, RDs) -> - is_gexpr({call,Line,{atom,Lr,is_record},[E,A]}, RDs); -is_guard_test2({call,_Line,{atom,_La,Test},As}=Call, RDs) -> - case erl_internal:type_test(Test, length(As)) of - true -> is_gexpr_list(As, RDs); - false -> is_gexpr(Call, RDs) - end; -is_guard_test2(G, RDs) -> +is_guard_test2({call,Line,{atom,Lr,record},[E,A]}, Info) -> + is_gexpr({call,Line,{atom,Lr,is_record},[E,A]}, Info); +is_guard_test2({call,_Line,{atom,_La,Test},As}=Call, {_,IsOverridden}=Info) -> + A = length(As), + not IsOverridden({Test,A}) andalso + case erl_internal:type_test(Test, A) of + true -> is_gexpr_list(As, Info); + false -> is_gexpr(Call, Info) + end; +is_guard_test2(G, Info) -> %%Everything else is a guard expression. - is_gexpr(G, RDs). + is_gexpr(G, Info). %% is_guard_expr(Expression) -> boolean(). %% Test if an expression is a guard expression. is_guard_expr(E) -> is_gexpr(E, []). -is_gexpr({var,_L,_V}, _RDs) -> true; -is_gexpr({char,_L,_C}, _RDs) -> true; -is_gexpr({integer,_L,_I}, _RDs) -> true; -is_gexpr({float,_L,_F}, _RDs) -> true; -is_gexpr({atom,_L,_A}, _RDs) -> true; -is_gexpr({string,_L,_S}, _RDs) -> true; -is_gexpr({nil,_L}, _RDs) -> true; -is_gexpr({cons,_L,H,T}, RDs) -> is_gexpr_list([H,T], RDs); -is_gexpr({tuple,_L,Es}, RDs) -> is_gexpr_list(Es, RDs); -%%is_gexpr({struct,_L,_Tag,Es}, RDs) -> -%% is_gexpr_list(Es, RDs); -is_gexpr({record_index,_L,_Name,Field}, RDs) -> - is_gexpr(Field, RDs); -is_gexpr({record_field,_L,Rec,_Name,Field}, RDs) -> - is_gexpr_list([Rec,Field], RDs); -is_gexpr({record,L,Name,Inits}, RDs) -> - is_gexpr_fields(Inits, L, Name, RDs); -is_gexpr({bin,_L,Fs}, RDs) -> +is_gexpr({var,_L,_V}, _Info) -> true; +is_gexpr({char,_L,_C}, _Info) -> true; +is_gexpr({integer,_L,_I}, _Info) -> true; +is_gexpr({float,_L,_F}, _Info) -> true; +is_gexpr({atom,_L,_A}, _Info) -> true; +is_gexpr({string,_L,_S}, _Info) -> true; +is_gexpr({nil,_L}, _Info) -> true; +is_gexpr({cons,_L,H,T}, Info) -> is_gexpr_list([H,T], Info); +is_gexpr({tuple,_L,Es}, Info) -> is_gexpr_list(Es, Info); +%%is_gexpr({struct,_L,_Tag,Es}, Info) -> +%% is_gexpr_list(Es, Info); +is_gexpr({record_index,_L,_Name,Field}, Info) -> + is_gexpr(Field, Info); +is_gexpr({record_field,_L,Rec,_Name,Field}, Info) -> + is_gexpr_list([Rec,Field], Info); +is_gexpr({record,L,Name,Inits}, Info) -> + is_gexpr_fields(Inits, L, Name, Info); +is_gexpr({bin,_L,Fs}, Info) -> all(fun ({bin_element,_Line,E,Sz,_Ts}) -> - is_gexpr(E, RDs) and (Sz =:= default orelse is_gexpr(Sz, RDs)) + is_gexpr(E, Info) and (Sz =:= default orelse is_gexpr(Sz, Info)) end, Fs); -is_gexpr({call,_L,{atom,_Lf,F},As}, RDs) -> +is_gexpr({call,_L,{atom,_Lf,F},As}, {_,IsOverridden}=Info) -> A = length(As), - erl_internal:guard_bif(F, A) andalso is_gexpr_list(As, RDs); -is_gexpr({call,_L,{remote,_Lr,{atom,_Lm,erlang},{atom,_Lf,F}},As}, RDs) -> + not IsOverridden({F,A}) andalso erl_internal:guard_bif(F, A) + andalso is_gexpr_list(As, Info); +is_gexpr({call,_L,{remote,_Lr,{atom,_Lm,erlang},{atom,_Lf,F}},As}, Info) -> A = length(As), (erl_internal:guard_bif(F, A) orelse is_gexpr_op(F, A)) - andalso is_gexpr_list(As, RDs); -is_gexpr({call,L,{tuple,Lt,[{atom,Lm,erlang},{atom,Lf,F}]},As}, RDs) -> - is_gexpr({call,L,{remote,Lt,{atom,Lm,erlang},{atom,Lf,F}},As}, RDs); -is_gexpr({op,_L,Op,A}, RDs) -> - is_gexpr_op(Op, 1) andalso is_gexpr(A, RDs); -is_gexpr({op,_L,'andalso',A1,A2}, RDs) -> - is_gexpr_list([A1,A2], RDs); -is_gexpr({op,_L,'orelse',A1,A2}, RDs) -> - is_gexpr_list([A1,A2], RDs); -is_gexpr({op,_L,Op,A1,A2}, RDs) -> - is_gexpr_op(Op, 2) andalso is_gexpr_list([A1,A2], RDs); -is_gexpr(_Other, _RDs) -> false. + andalso is_gexpr_list(As, Info); +is_gexpr({call,L,{tuple,Lt,[{atom,Lm,erlang},{atom,Lf,F}]},As}, Info) -> + is_gexpr({call,L,{remote,Lt,{atom,Lm,erlang},{atom,Lf,F}},As}, Info); +is_gexpr({op,_L,Op,A}, Info) -> + is_gexpr_op(Op, 1) andalso is_gexpr(A, Info); +is_gexpr({op,_L,'andalso',A1,A2}, Info) -> + is_gexpr_list([A1,A2], Info); +is_gexpr({op,_L,'orelse',A1,A2}, Info) -> + is_gexpr_list([A1,A2], Info); +is_gexpr({op,_L,Op,A1,A2}, Info) -> + is_gexpr_op(Op, 2) andalso is_gexpr_list([A1,A2], Info); +is_gexpr(_Other, _Info) -> false. is_gexpr_op(Op, A) -> try erl_internal:op_type(Op, A) of @@ -2047,14 +2151,14 @@ is_gexpr_op(Op, A) -> catch _:_ -> false end. -is_gexpr_list(Es, RDs) -> all(fun (E) -> is_gexpr(E, RDs) end, Es). +is_gexpr_list(Es, Info) -> all(fun (E) -> is_gexpr(E, Info) end, Es). -is_gexpr_fields(Fs, L, Name, RDs) -> +is_gexpr_fields(Fs, L, Name, {RDs,_}=Info) -> IFs = case dict:find(Name, RDs) of {ok,{_Line,Fields}} -> Fs ++ init_fields(Fs, L, Fields); error -> Fs end, - all(fun ({record_field,_Lf,_Name,V}) -> is_gexpr(V, RDs); + all(fun ({record_field,_Lf,_Name,V}) -> is_gexpr(V, Info); (_Other) -> false end, IFs). %% exprs(Sequence, VarTable, State) -> @@ -2185,11 +2289,18 @@ expr({call,L,{tuple,Lt,[{atom,Lm,erlang},{atom,Lf,is_record}]},As}, Vt, St) -> expr({call,Line,{remote,_Lr,{atom,_Lm,M},{atom,Lf,F}},As}, Vt, St0) -> St1 = keyword_warning(Lf, F, St0), St2 = check_remote_function(Line, M, F, As, St1), - expr_list(As, Vt, St2); + St3 = check_module_name(M, Line, St2), + expr_list(As, Vt, St3); expr({call,Line,{remote,_Lr,M,F},As}, Vt, St0) -> St1 = keyword_warning(Line, M, St0), St2 = keyword_warning(Line, F, St1), - expr_list([M,F|As], Vt, St2); + St3 = case M of + {atom,Lm,Mod} -> + check_module_name(Mod, Lm, St2); + _ -> + St2 + end, + expr_list([M,F|As], Vt, St3); expr({call,Line,{atom,La,F},As}, Vt, St0) -> St1 = keyword_warning(La, F, St0), {Asvt,St2} = expr_list(As, Vt, St1), @@ -2251,26 +2362,28 @@ expr({call,Line,F,As}, Vt, St0) -> expr({'try',Line,Es,Scs,Ccs,As}, Vt, St0) -> %% Currently, we don't allow any exports because later %% passes cannot handle exports in combination with 'after'. - {Evt0,St1} = exprs(Es, Vt, St0), + {Evt0,St1} = exprs(Es, Vt, St0#lint{catch_scope=wrong_part_of_try}), TryLine = {'try',Line}, Uvt = vtunsafe(TryLine, Evt0, Vt), Evt1 = vtupdate(Uvt, Evt0), - {Sccs,St2} = icrt_clauses(Scs++Ccs, TryLine, vtupdate(Evt1, Vt), St1), + {Sccs,St2} = try_clauses(Scs, Ccs, TryLine, + vtupdate(Evt1, Vt), St1), Rvt0 = Sccs, Rvt1 = vtupdate(vtunsafe(TryLine, Rvt0, Vt), Rvt0), Evt2 = vtmerge(Evt1, Rvt1), {Avt0,St} = exprs(As, vtupdate(Evt2, Vt), St2), Avt1 = vtupdate(vtunsafe(TryLine, Avt0, Vt), Avt0), Avt = vtmerge(Evt2, Avt1), - {Avt,St}; + {Avt,St#lint{catch_scope=after_try}}; expr({'catch',Line,E}, Vt, St0) -> %% No new variables added, flag new variables as unsafe. {Evt,St} = expr(E, Vt, St0), - {vtupdate(vtunsafe({'catch',Line}, Evt, Vt), Evt),St}; + {vtupdate(vtunsafe({'catch',Line}, Evt, Vt), Evt), + St#lint{catch_scope=after_old_catch}}; expr({match,_Line,P,E}, Vt, St0) -> {Evt,St1} = expr(E, Vt, St0), {Pvt,Bvt,St2} = pattern(P, vtupdate(Evt, Vt), St1), - St = reject_bin_alias_expr(P, E, St2), + St = reject_invalid_alias_expr(P, E, Vt, St2), {vtupdate(Bvt, vtmerge(Evt, Pvt)),St}; %% No comparison or boolean operators yet. expr({op,_Line,_Op,A}, Vt, St) -> @@ -2367,7 +2480,7 @@ is_valid_call(Call) -> _ -> true end. -%% is_valid_map_key(K,St) -> true | false +%% is_valid_map_key(K) -> true | false %% variables are allowed for patterns only at the top of the tree is_valid_map_key({var,_,_}) -> true; @@ -2433,7 +2546,10 @@ record_def(Line, Name, Fs0, St0) -> true -> add_error(Line, {redefine_record,Name}, St0); false -> {Fs1,St1} = def_fields(normalise_fields(Fs0), Name, St0), - St1#lint{records=dict:store(Name, {Line,Fs1}, St1#lint.records)} + St2 = St1#lint{records=dict:store(Name, {Line,Fs1}, + St1#lint.records)}, + Types = [T || {typed_record_field, _, T} <- Fs0], + check_type({type, nowarn(), product, Types}, St2) end. %% def_fields([RecDef], RecordName, State) -> {[DefField],State}. @@ -2636,11 +2752,8 @@ find_field(_F, []) -> error. %% Attr :: 'type' | 'opaque' %% Checks that a type definition is valid. -type_def(_Attr, _Line, {record, _RecName}, Fields, [], St0) -> - %% The record field names and such are checked in the record format. - %% We only need to check the types. - Types = [T || {typed_record_field, _, T} <- Fields], - check_type({type, nowarn(), product, Types}, St0); +-dialyzer({no_match, type_def/6}). + type_def(Attr, Line, TypeName, ProtoType, Args, St0) -> TypeDefs = St0#lint.types, Arity = length(Args), @@ -2702,10 +2815,9 @@ check_type(Types, St) -> check_type({ann_type, _L, [_Var, Type]}, SeenVars, St) -> check_type(Type, SeenVars, St); -check_type({paren_type, _L, [Type]}, SeenVars, St) -> - check_type(Type, SeenVars, St); check_type({remote_type, L, [{atom, _, Mod}, {atom, _, Name}, Args]}, - SeenVars, St0) -> + SeenVars, St00) -> + St0 = check_module_name(Mod, L, St00), St = deprecated_type(L, Mod, Name, Args, St0), CurrentMod = St#lint.module, case Mod =:= CurrentMod of @@ -2743,10 +2855,8 @@ check_type({type, L, range, [From, To]}, SeenVars, St) -> _ -> add_error(L, {type_syntax, range}, St) end, {SeenVars, St1}; -check_type({type, L, map, any}, SeenVars, St) -> - %% To get usage right while map/0 is a newly_introduced_builtin_type. - St1 = used_type({map, 0}, L, St), - {SeenVars, St1}; +check_type({type, _L, map, any}, SeenVars, St) -> + {SeenVars, St}; check_type({type, _L, map, Pairs}, SeenVars, St) -> lists:foldl(fun(Pair, {AccSeenVars, AccSt}) -> check_type(Pair, AccSeenVars, AccSt) @@ -2803,6 +2913,8 @@ check_type({user_type, L, TypeName, Args}, SeenVars, St) -> lists:foldl(fun(T, {AccSeenVars, AccSt}) -> check_type(T, AccSeenVars, AccSt) end, {SeenVars, St1}, Args); +check_type([{typed_record_field,Field,_T}|_], SeenVars, St) -> + {SeenVars, add_error(element(2, Field), old_abstract_code, St)}; check_type(I, SeenVars, St) -> case erl_eval:partial_eval(I) of {integer,_ILn,_Integer} -> {SeenVars, St}; @@ -2852,7 +2964,6 @@ used_type(TypePair, L, #lint{usage = Usage, file = File} = St) -> is_default_type({Name, NumberOfTypeVariables}) -> erl_internal:is_type(Name, NumberOfTypeVariables). -is_newly_introduced_builtin_type({map, 0}) -> true; is_newly_introduced_builtin_type({Name, _}) when is_atom(Name) -> false. is_obsolete_builtin_type(TypePair) -> @@ -2865,15 +2976,16 @@ obsolete_builtin_type({Name, A}) when is_atom(Name), is_integer(A) -> no. %% spec_decl(Line, Fun, Types, State) -> State. -spec_decl(Line, MFA0, TypeSpecs, St0 = #lint{specs = Specs, module = Mod}) -> +spec_decl(Line, MFA0, TypeSpecs, St00 = #lint{specs = Specs, module = Mod}) -> MFA = case MFA0 of {F, Arity} -> {Mod, F, Arity}; {_M, _F, Arity} -> MFA0 end, + St0 = check_module_name(element(1, MFA), Line, St00), St1 = St0#lint{specs = dict:store(MFA, Line, Specs)}, case dict:is_key(MFA, Specs) of true -> add_error(Line, {redefine_spec, MFA0}, St1); - false -> check_specs(TypeSpecs, Arity, St1) + false -> check_specs(TypeSpecs, spec_wrong_arity, Arity, St1) end. %% callback_decl(Line, Fun, Types, State) -> State. @@ -2881,13 +2993,16 @@ spec_decl(Line, MFA0, TypeSpecs, St0 = #lint{specs = Specs, module = Mod}) -> callback_decl(Line, MFA0, TypeSpecs, St0 = #lint{callbacks = Callbacks, module = Mod}) -> case MFA0 of - {_M, _F, _A} -> add_error(Line, {bad_callback, MFA0}, St0); + {M, _F, _A} -> + St1 = check_module_name(M, Line, St0), + add_error(Line, {bad_callback, MFA0}, St1); {F, Arity} -> MFA = {Mod, F, Arity}, St1 = St0#lint{callbacks = dict:store(MFA, Line, Callbacks)}, case dict:is_key(MFA, Callbacks) of true -> add_error(Line, {redefine_callback, MFA0}, St1); - false -> check_specs(TypeSpecs, Arity, St1) + false -> check_specs(TypeSpecs, callback_wrong_arity, + Arity, St1) end end. @@ -2924,7 +3039,17 @@ is_fa({FuncName, Arity}) when is_atom(FuncName), is_integer(Arity), Arity >= 0 -> true; is_fa(_) -> false. -check_specs([FunType|Left], Arity, St0) -> +check_module_name(M, Line, St) -> + case is_latin1_name(M) of + true -> St; + false -> + add_error(Line, non_latin1_module_unsupported, St) + end. + +is_latin1_name(Name) -> + io_lib:latin1_char_list(atom_to_list(Name)). + +check_specs([FunType|Left], ETag, Arity, St0) -> {FunType1, CTypes} = case FunType of {type, _, bounded_fun, [FT = {type, _, 'fun', _}, Cs]} -> @@ -2932,18 +3057,16 @@ check_specs([FunType|Left], Arity, St0) -> {FT, lists:append(Types0)}; {type, _, 'fun', _} = FT -> {FT, []} end, - SpecArity = - case FunType1 of - {type, L, 'fun', [any, _]} -> any; - {type, L, 'fun', [{type, _, product, D}, _]} -> length(D) - end, + {type, L, 'fun', [{type, _, product, D}, _]} = FunType1, + SpecArity = length(D), St1 = case Arity =:= SpecArity of true -> St0; - false -> add_error(L, spec_wrong_arity, St0) + false -> %% Cannot happen if called from the compiler. + add_error(L, ETag, St0) end, St2 = check_type({type, nowarn(), product, [FunType1|CTypes]}, St1), - check_specs(Left, Arity, St2); -check_specs([], _Arity, St) -> + check_specs(Left, ETag, Arity, St2); +check_specs([], _ETag, _Arity, St) -> St. nowarn() -> @@ -2985,9 +3108,10 @@ add_missing_spec_warnings(Forms, St0, Type) -> [{FA,L} || {function,L,F,A,_} <- Forms, not lists:member(FA = {F,A}, Specs)]; exported -> - Exps = gb_sets:to_list(St0#lint.exports) -- pseudolocals(), + Exps0 = gb_sets:to_list(St0#lint.exports) -- pseudolocals(), + Exps = Exps0 -- Specs, [{FA,L} || {function,L,F,A,_} <- Forms, - member(FA = {F,A}, Exps -- Specs)] + member(FA = {F,A}, Exps)] end, foldl(fun ({FA,L}, St) -> add_warning(L, {missing_spec,FA}, St) @@ -3000,7 +3124,9 @@ check_unused_types(Forms, #lint{usage=Usage, types=Ts, exp_types=ExpTs}=St) -> L = gb_sets:to_list(ExpTs) ++ dict:fetch_keys(D), UsedTypes = gb_sets:from_list(L), FoldFun = - fun(Type, #typeinfo{line = FileLine}, AccSt) -> + fun({{record, _}=_Type, 0}, _, AccSt) -> + AccSt; % Before Erlang/OTP 19.0 + (Type, #typeinfo{line = FileLine}, AccSt) -> case loc(FileLine, AccSt) of {FirstFile, _} -> case gb_sets:is_member(Type, UsedTypes) of @@ -3034,6 +3160,70 @@ check_local_opaque_types(St) -> end, dict:fold(FoldFun, St, Ts). +check_dialyzer_attribute(Forms, St0) -> + Vals = [{L,V} || + {attribute,L,dialyzer,Val} <- Forms, + V0 <- lists:flatten([Val]), + V <- case V0 of + {O,F} -> + [{A,B} || + A <- lists:flatten([O]), + B <- lists:flatten([F])]; + T -> [T] + end], + {Wellformed, Bad} = + lists:partition(fun ({_,{Option,FA}}) when is_atom(Option) -> + is_fa(FA); + ({_,Option}) when is_atom(Option) -> true; + (_) -> false + end, Vals), + St1 = foldl(fun ({L,Term}, St) -> + add_error(L, {bad_dialyzer_attribute,Term}, St) + end, St0, Bad), + DefFunctions = (gb_sets:to_list(St0#lint.defined) -- pseudolocals()), + Fun = fun ({L,{Option,FA}}, St) -> + case is_function_dialyzer_option(Option) of + true -> + case lists:member(FA, DefFunctions) of + true -> St; + false -> + add_error(L, {undefined_function,FA}, St) + end; + false -> + add_error(L, {bad_dialyzer_option,Option}, St) + end; + ({L,Option}, St) -> + case is_module_dialyzer_option(Option) of + true -> St; + false -> + add_error(L, {bad_dialyzer_option,Option}, St) + end + end, + foldl(Fun, St1, Wellformed). + +is_function_dialyzer_option(nowarn_function) -> true; +is_function_dialyzer_option(Option) -> + is_module_dialyzer_option(Option). + +is_module_dialyzer_option(Option) -> + lists:member(Option, + [no_return,no_unused,no_improper_lists,no_fun_app, + no_match,no_opaque,no_fail_call,no_contracts, + no_behaviours,no_undefined_callbacks,unmatched_returns, + error_handling,race_conditions,no_missing_calls, + specdiffs,overspecs,underspecs,unknown]). + +%% try_catch_clauses(Scs, Ccs, In, ImportVarTable, State) -> +%% {UpdVt,State}. + +try_clauses(Scs, Ccs, In, Vt, St0) -> + {Csvt0,St1} = icrt_clauses(Scs, Vt, St0), + St2 = St1#lint{catch_scope=try_catch}, + {Csvt1,St3} = icrt_clauses(Ccs, Vt, St2), + Csvt = Csvt0 ++ Csvt1, + UpdVt = icrt_export(Csvt, Vt, In, St3), + {UpdVt,St3}. + %% icrt_clauses(Clauses, In, ImportVarTable, State) -> %% {UpdVt,State}. @@ -3048,13 +3238,13 @@ icrt_clauses(Cs, In, Vt, St0) -> icrt_clauses(Cs, Vt, St) -> mapfoldl(fun (C, St0) -> icrt_clause(C, Vt, St0) end, St, Cs). -icrt_clause({clause,_Line,H,G,B}, Vt0, St0) -> +icrt_clause({clause,_Line,H,G,B}, Vt0, #lint{catch_scope=Scope}=St0) -> {Hvt,Binvt,St1} = head(H, Vt0, St0), Vt1 = vtupdate(Hvt, Binvt), {Gvt,St2} = guard(G, vtupdate(Vt1, Vt0), St1), Vt2 = vtupdate(Gvt, Vt1), {Bvt,St3} = exprs(B, vtupdate(Vt2, Vt0), St2), - {vtupdate(Bvt, Vt2),St3}. + {vtupdate(Bvt, Vt2),St3#lint{catch_scope=Scope}}. icrt_export(Vts, Vt, {Tag,Attrs}, St) -> {_File,Loc} = loc(Attrs, St), @@ -3159,7 +3349,8 @@ lc_quals([{b_generate,_Line,P,E} | Qs], Vt0, Uvt0, St0) -> {Vt,Uvt,St} = handle_generator(P,E,Vt0,Uvt0,St1), lc_quals(Qs, Vt, Uvt, St); lc_quals([F|Qs], Vt, Uvt, St0) -> - {Fvt,St1} = case is_guard_test2(F, St0#lint.records) of + Info = is_guard_test2_info(St0), + {Fvt,St1} = case is_guard_test2(F, Info) of true -> guard_test(F, Vt, St0); false -> expr(F, Vt, St0) end, @@ -3167,6 +3358,12 @@ lc_quals([F|Qs], Vt, Uvt, St0) -> lc_quals([], Vt, Uvt, St) -> {Vt, Uvt, St}. +is_guard_test2_info(#lint{records=RDs,locals=Locals,imports=Imports}) -> + {RDs,fun(FA) -> + is_local_function(Locals, FA) orelse + is_imported_function(Imports, FA) + end}. + handle_generator(P,E,Vt,Uvt,St0) -> {Evt,St1} = expr(E, Vt, St0), %% Forget variables local to E immediately. @@ -3187,8 +3384,8 @@ handle_generator(P,E,Vt,Uvt,St0) -> handle_bitstring_gen_pat({bin,_,Segments=[_|_]},St) -> case lists:last(Segments) of {bin_element,Line,{var,_,_},default,Flags} when is_list(Flags) -> - case member(binary, Flags) orelse member(bits, Flags) - orelse member(bitstring, Flags) of + case member(binary, Flags) orelse member(bytes, Flags) + orelse member(bits, Flags) orelse member(bitstring, Flags) of true -> add_error(Line, unsized_binary_in_bin_gen_pattern, St); false -> @@ -3400,6 +3597,14 @@ warn_unused_vars(U, Vt, St0) -> UVt = map(fun ({V,{State,_,Ls}}) -> {V,{State,used,Ls}} end, U), {vtmerge(Vt, UVt), St1}. + +is_var_bound(V, Vt) -> + case orddict:find(V, Vt) of + {ok,{bound,_Usage,_}} -> true; + _ -> false + end. + + %% vtupdate(UpdVarTable, VarTable) -> VarTable. %% Add the variables in the updated vartable to VarTable. The variables %% will be updated with their property in UpdVarTable. The state of @@ -3482,13 +3687,6 @@ vt_no_unused(Vt) -> [V || {_,{_,U,_L}}=V <- Vt, U =/= unused]. copy_expr(Expr, Anno) -> erl_parse:map_anno(fun(_A) -> Anno end, Expr). -%% modify_line(Form, Fun) -> Form -%% modify_line(Expression, Fun) -> Expression -%% Applies Fun to each line number occurrence. - -modify_line(T, F0) -> - erl_parse:map_anno(F0, T). - %% Check a record_info call. We have already checked that it is not %% shadowed by an import. @@ -3510,7 +3708,8 @@ has_wildcard_field([]) -> false. check_remote_function(Line, M, F, As, St0) -> St1 = deprecated_function(Line, M, F, As, St0), St2 = check_qlc_hrl(Line, M, F, As, St1), - format_function(Line, M, F, As, St2). + St3 = check_get_stacktrace(Line, M, F, As, St2), + format_function(Line, M, F, As, St3). %% check_qlc_hrl(Line, ModName, FuncName, [Arg], State) -> State %% Add warning if qlc:q/1,2 has been called but qlc.hrl has not @@ -3529,6 +3728,8 @@ check_qlc_hrl(Line, M, F, As, St) -> %% deprecated_function(Line, ModName, FuncName, [Arg], State) -> State. %% Add warning for calls to deprecated functions. +-dialyzer({no_match, deprecated_function/5}). + deprecated_function(Line, M, F, As, St) -> Arity = length(As), MFA = {M, F, Arity}, @@ -3557,6 +3758,25 @@ deprecated_function(Line, M, F, As, St) -> St end. +check_get_stacktrace(Line, erlang, get_stacktrace, [], St) -> + case St of + #lint{catch_scope=none} -> + St; + #lint{catch_scope=try_catch} -> + St; + #lint{catch_scope=Scope} -> + case is_warn_enabled(get_stacktrace, St) of + false -> + St; + true -> + add_warning(Line, {get_stacktrace,Scope}, St) + end + end; +check_get_stacktrace(_, _, _, _, St) -> + St. + +-dialyzer({no_match, deprecated_type/5}). + deprecated_type(L, M, N, As, St) -> NAs = length(As), case otp_internal:obsolete_type(M, N, NAs) of @@ -3567,6 +3787,8 @@ deprecated_type(L, M, N, As, St) -> false -> St end; + {removed, Replacement, Rel} -> + add_warning(L, {removed_type, {M,N,NAs}, Replacement, Rel}, St); no -> St end. @@ -3577,16 +3799,26 @@ obsolete_guard({call,Line,{atom,Lr,F},As}, St0) -> false -> deprecated_function(Line, erlang, F, As, St0); true -> - case is_warn_enabled(obsolete_guard, St0) of - true -> - add_warning(Lr,{obsolete_guard, {F, Arity}}, St0); - false -> - St0 - end + St = case is_warn_enabled(obsolete_guard, St0) of + true -> + add_warning(Lr, {obsolete_guard, {F, Arity}}, St0); + false -> + St0 + end, + test_overriden_by_local(Lr, F, Arity, St) end; obsolete_guard(_G, St) -> St. +test_overriden_by_local(Line, OldTest, Arity, St) -> + ModernTest = list_to_atom("is_"++atom_to_list(OldTest)), + case is_local_function(St#lint.locals, {ModernTest, Arity}) of + true -> + add_error(Line, {obsolete_guard_overridden,OldTest}, St); + false -> + St + end. + %% keyword_warning(Line, Atom, State) -> State. %% Add warning for atoms that will be reserved keywords in the future. %% (Currently, no such keywords to warn for.) @@ -3720,6 +3952,10 @@ extract_sequence(4, [$t, $p | Fmt], Need) -> extract_sequence(5, [$p|Fmt], Need); extract_sequence(4, [$t, $P | Fmt], Need) -> extract_sequence(5, [$P|Fmt], Need); +extract_sequence(4, [$t, $w | Fmt], Need) -> + extract_sequence(5, [$w|Fmt], Need); +extract_sequence(4, [$t, $W | Fmt], Need) -> + extract_sequence(5, [$W|Fmt], Need); extract_sequence(4, [$t, C | _Fmt], _Need) -> {error,"invalid control ~t" ++ [C]}; extract_sequence(4, [$l, $p | Fmt], Need) -> |