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erl_lint.erl
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erl_lint.erl
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%% -*- erlang-indent-level: 4 -*-
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2012. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%% Do necessary checking of Erlang code.
%% N.B. All the code necessary for checking structs (tagged tuples) is
%% here. Just comment out the lines in pattern/2, gexpr/3 and expr/3.
-module(erl_lint).
-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_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]).
%% bool_option(OnOpt, OffOpt, Default, Options) -> boolean().
%% value_option(Flag, Default, Options) -> Value.
%% value_option(Flag, Default, OnOpt, OnVal, OffOpt, OffVal, Options) ->
%% Value.
%% The option handling functions.
-spec bool_option(atom(), atom(), boolean(), [compile:option()]) -> boolean().
bool_option(On, Off, Default, Opts) ->
foldl(fun (Opt, _Def) when Opt =:= On -> true;
(Opt, _Def) when Opt =:= Off -> false;
(_Opt, Def) -> Def
end, Default, Opts).
value_option(Flag, Default, Opts) ->
foldl(fun ({Opt,Val}, _Def) when Opt =:= Flag -> Val;
(_Opt, Def) -> Def
end, Default, Opts).
value_option(Flag, Default, On, OnVal, Off, OffVal, Opts) ->
foldl(fun ({Opt,Val}, _Def) when Opt =:= Flag -> Val;
(Opt, _Def) when Opt =:= On -> OnVal;
(Opt, _Def) when Opt =:= Off -> OffVal;
(_Opt, Def) -> Def
end, Default, Opts).
%% The maximum number of arguments allowed for a function.
-define(MAX_ARGUMENTS, 255).
%% The error and warning info structures, {Line,Module,Descriptor},
%% are kept in their seperate fields in the lint state record together
%% with the name of the file (when a new file is entered, marked by
%% the 'file' attribute, then the field 'file' of the lint record is
%% set). At the end of the run these lists are packed into a list of
%% {FileName,ErrorDescList} pairs which are returned.
-include_lib("stdlib/include/erl_bits.hrl").
%%-define(DEBUGF(X,Y), io:format(X, Y)).
-define(DEBUGF(X,Y), void).
-type line() :: erl_scan:line(). % a convenient alias
-type fa() :: {atom(), arity()}. % function+arity
-type ta() :: {atom(), arity()}. % type+arity
%% Usage of records, functions, and imports. The variable table, which
%% is passed on as an argument, holds the usage of variables.
-record(usage, {
calls = dict:new(), %Who calls who
imported = [], %Actually imported functions
used_records=sets:new() :: set(), %Used record definitions
used_types = dict:new() :: dict() %Used type definitions
}).
%% 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
package="", %Module package
extends=[], %Extends
behaviour=[], %Behaviour
exports=gb_sets:empty() :: gb_set(), %Exports
imports=[], %Imports
mod_imports=dict:new() :: dict(), %Module Imports
compile=[], %Compile flags
records=dict:new() :: dict(), %Record definitions
locals=gb_sets:empty() :: gb_set(), %All defined functions (prescanned)
no_auto=gb_sets:empty() :: gb_set(), %Functions explicitly not autoimported
defined=gb_sets:empty() :: gb_set(), %Defined fuctions
on_load=[] :: [fa()], %On-load function
on_load_line=0 :: line(), %Line for on_load
clashes=[], %Exported functions named as BIFs
not_deprecated=[], %Not considered deprecated
func=[], %Current function
warn_format=0, %Warn format calls
enabled_warnings=[], %All enabled warnings (ordset).
errors=[], %Current errors
warnings=[], %Current warnings
global_vt=[], %The global VarTable
file = "" :: string(), %From last file attribute
recdef_top=false :: boolean(), %true in record initialisation
%outside any fun or lc
xqlc= false :: boolean(), %true if qlc.hrl included
new = false :: boolean(), %Has user-defined 'new/N'
called= [] :: [{fa(),line()}], %Called functions
usage = #usage{} :: #usage{},
specs = dict:new() :: dict(), %Type specifications
callbacks = dict:new() :: dict(), %Callback types
types = dict:new() :: dict(), %Type definitions
exp_types=gb_sets:empty():: gb_set() %Exported types
}).
-type lint_state() :: #lint{}.
-type error_description() :: term().
-type error_info() :: {erl_scan:line(), module(), error_description()}.
%% format_error(Error)
%% Return a string describing the error.
-spec format_error(ErrorDescriptor) -> io_lib:chars() when
ErrorDescriptor :: error_description().
format_error(undefined_module) ->
"no module definition";
format_error({bad_module_name, M}) ->
io_lib:format("bad module name '~s'", [M]);
format_error(redefine_module) ->
"redefining module";
format_error(redefine_extends) ->
"redefining extends attribute";
format_error(extends_self) ->
"cannot extend from self";
%% format_error({redefine_mod_import, M, P}) ->
%% io_lib:format("module '~s' already imported from package '~s'", [M, P]);
format_error(invalid_call) ->
"invalid function call";
format_error(invalid_record) ->
"invalid record expression";
format_error({attribute,A}) ->
io_lib:format("attribute '~w' 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,{bif,{F,A},M}}) ->
io_lib:format("function ~w/~w already auto-imported from ~w", [F,A,M]);
format_error({redefine_import,{{F,A},M}}) ->
io_lib:format("function ~w/~w already imported from ~w", [F,A,M]);
format_error({bad_inline,{F,A}}) ->
io_lib:format("inlined function ~w/~w undefined", [F,A]);
format_error({invalid_deprecated,D}) ->
io_lib:format("badly formed deprecated attribute ~w", [D]);
format_error(invalid_extends) ->
"badly formed extends attribute";
format_error(define_instance) ->
"defining instance function not allowed in abstract module";
format_error({bad_deprecated,{F,A}}) ->
io_lib:format("deprecated function ~w/~w undefined or not exported", [F,A]);
format_error({bad_nowarn_unused_function,{F,A}}) ->
io_lib:format("function ~w/~w undefined", [F,A]);
format_error({bad_nowarn_bif_clash,{F,A}}) ->
io_lib:format("function ~w/~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]);
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]);
format_error({undefined_on_load,{F,A}}) ->
io_lib:format("function ~w/~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]);
format_error({unused_import,{{F,A},M}}) ->
io_lib:format("import ~w:~w/~w is unused", [M,F,A]);
format_error({undefined_function,{F,A}}) ->
io_lib:format("function ~w/~w undefined", [F,A]);
format_error({redefine_function,{F,A}}) ->
io_lib:format("function ~w/~w already defined", [F,A]);
format_error({define_import,{F,A}}) ->
io_lib:format("defining imported function ~w/~w", [F,A]);
format_error({unused_function,{F,A}}) ->
io_lib:format("function ~w/~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]}).\" "
"to resolve name clash", [F,A,F,A,F,A]);
format_error({call_to_redefined_old_bif,{F,A}}) ->
io_lib:format("ambiguous call of overridden pre R14 auto-imported BIF ~w/~w~n"
" - use erlang:~w/~w or \"-compile({no_auto_import,[~w/~w]}).\" "
"to resolve name clash", [F,A,F,A,F,A]);
format_error({redefine_old_bif_import,{F,A}}) ->
io_lib:format("import directive overrides pre R14 auto-imported BIF ~w/~w~n"
" - use \"-compile({no_auto_import,[~w/~w]}).\" "
"to resolve name clash", [F,A,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({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)]);
format_error({deprecated, {M1, F1, A1}, String}) when is_list(String) ->
io_lib:format("~p:~p/~p: ~s", [M1, F1, A1, String]);
format_error({removed, MFA, ReplacementMFA, Rel}) ->
io_lib:format("call to ~s will fail, since it was removed in ~s; "
"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({obsolete_guard, {F, A}}) ->
io_lib:format("~p/~p obsolete", [F, A]);
format_error({reserved_for_future,K}) ->
io_lib:format("atom ~w: future reserved keyword - rename or quote", [K]);
format_error({too_many_arguments,Arity}) ->
io_lib:format("too many arguments (~w) - "
"maximum allowed is ~w", [Arity,?MAX_ARGUMENTS]);
%% --- patterns and guards ---
format_error(illegal_pattern) -> "illegal pattern";
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",
[F,A]);
format_error(illegal_guard_expr) -> "illegal guard expression";
format_error(deprecated_tuple_fun) ->
"tuple funs are deprecated and will be removed in R16";
%% --- exports ---
format_error({explicit_export,F,A}) ->
io_lib:format("in this release, the call to ~w/~w must be written "
"like this: erlang:~w/~w",
[F,A,F,A]);
%% --- records ---
format_error({undefined_record,T}) ->
io_lib:format("record ~w undefined", [T]);
format_error({redefine_record,T}) ->
io_lib:format("record ~w already defined", [T]);
format_error({redefine_field,T,F}) ->
io_lib:format("field ~w already defined in record ~w", [F,T]);
format_error({undefined_field,T,F}) ->
io_lib:format("field ~w undefined in record ~w", [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]);
format_error({wildcard_in_update,T}) ->
io_lib:format("meaningless use of _ in update of record ~w", [T]);
format_error({unused_record,T}) ->
io_lib:format("record ~w is unused", [T]);
format_error({untyped_record,T}) ->
io_lib:format("record ~w has field(s) without type information", [T]);
%% --- variables ----
format_error({unbound_var,V}) ->
io_lib:format("variable ~w is unbound", [V]);
format_error({unsafe_var,V,{What,Where}}) ->
io_lib:format("variable ~w unsafe in ~w ~s",
[V,What,format_where(Where)]);
format_error({exported_var,V,{What,Where}}) ->
io_lib:format("variable ~w exported from ~w ~s",
[V,What,format_where(Where)]);
format_error({shadowed_var,V,In}) ->
io_lib:format("variable ~w shadowed in ~w", [V,In]);
format_error({unused_var, V}) ->
io_lib:format("variable ~w is unused", [V]);
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]);
format_error({bittype_mismatch,T1,T2,What}) ->
io_lib:format("bit type mismatch (~s) between ~p and ~p", [What,T1,T2]);
format_error(bittype_unit) ->
"a bit unit size must not be specified unless a size is specified too";
format_error(illegal_bitsize) ->
"illegal bit size";
format_error(unsized_binary_not_at_end) ->
"a binary field without size is only allowed at the end of a binary pattern";
format_error(typed_literal_string) ->
"a literal string in a binary pattern must not have a type or a size";
format_error(utf_bittype_size_or_unit) ->
"neither size nor unit must be given for segments of type utf8/utf16/utf32";
format_error({bad_bitsize,Type}) ->
io_lib:format("bad ~s bit size", [Type]);
%% --- behaviours ---
format_error({conflicting_behaviours,{Name,Arity},B,FirstL,FirstB}) ->
io_lib:format("conflicting behaviours - callback ~w/~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')",
[Func,Arity,Behaviour]);
format_error({undefined_behaviour,Behaviour}) ->
io_lib:format("behaviour ~w undefined", [Behaviour]);
format_error({undefined_behaviour_callbacks,Behaviour}) ->
io_lib:format("behaviour ~w callback functions are undefined",
[Behaviour]);
format_error({ill_defined_behaviour_callbacks,Behaviour}) ->
io_lib:format("behaviour ~w callback functions erroneously defined",
[Behaviour]);
format_error({behaviour_info, {_M,F,A}}) ->
io_lib:format("cannot define callback attibute for ~w/~w when "
"behaviour_info is defined",[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]);
format_error({undefined_type, {TypeName, Arity}}) ->
io_lib:format("type ~w~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)]);
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",
[TypeName, gen_type_paren(Arity)]);
format_error({builtin_type, {TypeName, Arity}}) ->
io_lib:format("type ~w~s is a builtin type; it cannot be redefined",
[TypeName, gen_type_paren(Arity)]);
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",
[TypeName, gen_type_paren(Arity)]);
format_error({type_syntax, Constr}) ->
io_lib:format("bad ~w type", [Constr]);
format_error({redefine_spec, {M, F, A}}) ->
io_lib:format("spec for ~w:~w/~w already defined", [M, F, A]);
format_error({redefine_callback, {M, F, A}}) ->
io_lib:format("callback ~w:~w/~w already defined", [M, F, A]);
format_error({spec_fun_undefined, {M, F, A}}) ->
io_lib:format("spec for undefined function ~w:~w/~w", [M, F, A]);
format_error({missing_spec, {F,A}}) ->
io_lib:format("missing specification for function ~w/~w", [F, A]);
format_error(spec_wrong_arity) ->
"spec has the wrong arity";
format_error(callback_wrong_arity) ->
"callback has the wrong arity";
format_error({imported_predefined_type, Name}) ->
io_lib:format("referring to built-in type ~w as a remote type; "
"please take out the module name", [Name]);
%% --- obsolete? unused? ---
format_error({format_error, {Fmt, Args}}) ->
io_lib:format(Fmt, Args);
format_error({mnemosyne, What}) ->
"mnemosyne " ++ What ++ ", missing transformation".
gen_type_paren(Arity) when is_integer(Arity), Arity >= 0 ->
gen_type_paren_1(Arity, ")").
gen_type_paren_1(0, Acc) -> "(" ++ Acc;
gen_type_paren_1(1, Acc) -> "(_" ++ Acc;
gen_type_paren_1(N, Acc) -> gen_type_paren_1(N - 1, ",_" ++ Acc).
format_mfa({M, F, [_|_]=As}) ->
","++ArityString = lists:append([[$,|integer_to_list(A)] || A <- As]),
format_mf(M, F, ArityString);
format_mfa({M, F, A}) when is_integer(A) ->
format_mf(M, F, integer_to_list(A)).
format_mf(M, F, ArityString) when is_atom(M), is_atom(F) ->
atom_to_list(M) ++ ":" ++ atom_to_list(F) ++ "/" ++ ArityString.
format_where(L) when is_integer(L) ->
io_lib:format("(line ~p)", [L]);
format_where({L,C}) when is_integer(L), is_integer(C) ->
io_lib:format("(line ~p, column ~p)", [L, C]).
%% Local functions that are somehow automatically generated.
pseudolocals() ->
[{module_info,0}, {module_info,1}, {record_info,2}].
%%
%% Used by erl_eval.erl to check commands.
%%
exprs(Exprs, BindingsList) ->
exprs_opt(Exprs, BindingsList, []).
exprs_opt(Exprs, BindingsList, Opts) ->
{St0,Vs} = foldl(fun({{record,_SequenceNumber,_Name},Attr0}, {St1,Vs1}) ->
Attr = zip_file_and_line(Attr0, "none"),
{attribute_state(Attr, St1),Vs1};
({V,_}, {St1,Vs1}) ->
{St1,[{V,{bound,unused,[]}} | Vs1]}
end, {start("nofile",Opts),[]}, BindingsList),
Vt = orddict:from_list(Vs),
{_Evt,St} = exprs(zip_file_and_line(Exprs, "nofile"), Vt, St0),
return_status(St).
used_vars(Exprs, BindingsList) ->
Vs = foldl(fun({{record,_SequenceNumber,_Name},_Attr}, Vs0) -> Vs0;
({V,_Val}, Vs0) -> [{V,{bound,unused,[]}} | Vs0]
end, [], BindingsList),
Vt = orddict:from_list(Vs),
{Evt,_St} = exprs(zip_file_and_line(Exprs, "nofile"), Vt, start()),
{ok, foldl(fun({V,{_,used,_}}, L) -> [V | L];
(_, L) -> L
end, [], Evt)}.
%% module([Form]) ->
%% module([Form], FileName) ->
%% module([Form], FileName, [CompileOption]) ->
%% {ok,[Warning]} | {error,[Error],[Warning]}
%% Start processing a module. Define predefined functions and exports and
%% apply_lambda/2 has been called to shut lint up. N.B. these lists are
%% really all ordsets!
-spec(module(AbsForms) -> {ok, Warnings} | {error, Errors, Warnings} when
AbsForms :: [erl_parse:abstract_form()],
Warnings :: [{file:filename(),[ErrorInfo]}],
Errors :: [{FileName2 :: file:filename(),[ErrorInfo]}],
ErrorInfo :: error_info()).
module(Forms) ->
Opts = compiler_options(Forms),
St = forms(Forms, start("nofile", Opts)),
return_status(St).
-spec(module(AbsForms, FileName) ->
{ok, Warnings} | {error, Errors, Warnings} when
AbsForms :: [erl_parse:abstract_form()],
FileName :: atom() | string(),
Warnings :: [{file:filename(),[ErrorInfo]}],
Errors :: [{FileName2 :: file:filename(),[ErrorInfo]}],
ErrorInfo :: error_info()).
module(Forms, FileName) ->
Opts = compiler_options(Forms),
St = forms(Forms, start(FileName, Opts)),
return_status(St).
-spec(module(AbsForms, FileName, CompileOptions) ->
{ok, Warnings} | {error, Errors, Warnings} when
AbsForms :: [erl_parse:abstract_form()],
FileName :: atom() | string(),
CompileOptions :: [compile:option()],
Warnings :: [{file:filename(),[ErrorInfo]}],
Errors :: [{FileName2 :: file:filename(),[ErrorInfo]}],
ErrorInfo :: error_info()).
module(Forms, FileName, Opts0) ->
%% We want the options given on the command line to take
%% precedence over options in the module.
Opts = compiler_options(Forms) ++ Opts0,
St = forms(Forms, start(FileName, Opts)),
return_status(St).
compiler_options(Forms) ->
lists:flatten([C || {attribute,_,compile,C} <- Forms]).
%% start() -> State
%% start(FileName, [Option]) -> State
start() ->
start("nofile", []).
start(File, Opts) ->
Enabled0 =
[{unused_vars,
bool_option(warn_unused_vars, nowarn_unused_vars,
true, Opts)},
{export_all,
bool_option(warn_export_all, nowarn_export_all,
false, Opts)},
{export_vars,
bool_option(warn_export_vars, nowarn_export_vars,
false, Opts)},
{shadow_vars,
bool_option(warn_shadow_vars, nowarn_shadow_vars,
true, Opts)},
{unused_import,
bool_option(warn_unused_import, nowarn_unused_import,
false, Opts)},
{unused_function,
bool_option(warn_unused_function, nowarn_unused_function,
true, Opts)},
{bif_clash,
bool_option(warn_bif_clash, nowarn_bif_clash,
true, Opts)},
{unused_record,
bool_option(warn_unused_record, nowarn_unused_record,
true, Opts)},
{deprecated_function,
bool_option(warn_deprecated_function, nowarn_deprecated_function,
true, Opts)},
{obsolete_guard,
bool_option(warn_obsolete_guard, nowarn_obsolete_guard,
true, Opts)},
{untyped_record,
bool_option(warn_untyped_record, nowarn_untyped_record,
false, Opts)},
{missing_spec,
bool_option(warn_missing_spec, nowarn_missing_spec,
false, Opts)},
{missing_spec_all,
bool_option(warn_missing_spec_all, nowarn_missing_spec_all,
false, Opts)}
],
Enabled1 = [Category || {Category,true} <- Enabled0],
Enabled = ordsets:from_list(Enabled1),
Calls = case ordsets:is_element(unused_function, Enabled) of
true ->
dict:from_list([{{module_info,1},pseudolocals()}]);
false ->
undefined
end,
#lint{state = start,
exports = gb_sets:from_list([{module_info,0},{module_info,1}]),
mod_imports = dict:from_list([{erlang,erlang}]),
compile = Opts,
%% Internal pseudo-functions must appear as defined/reached.
defined = gb_sets:from_list(pseudolocals()),
called = [{F,0} || F <- pseudolocals()],
usage = #usage{calls=Calls},
warn_format = value_option(warn_format, 1, warn_format, 1,
nowarn_format, 0, Opts),
enabled_warnings = Enabled,
file = File,
types = default_types()
}.
%% is_warn_enabled(Category, St) -> boolean().
%% Check whether a warning of category Category is enabled.
is_warn_enabled(Type, #lint{enabled_warnings=Enabled}) ->
ordsets:is_element(Type, Enabled).
%% return_status(State) ->
%% {ok,[Warning]} | {error,[Error],[Warning]}
%% Pack errors and warnings properly and return ok | error.
return_status(St) ->
Ws = pack_warnings(St#lint.warnings),
case pack_errors(St#lint.errors) of
[] -> {ok,Ws};
Es -> {error,Es,Ws}
end.
%% pack_errors([{File,ErrD}]) -> [{File,[ErrD]}].
%% Sort on (reversed) insertion order.
pack_errors(Es) ->
{Es1,_} = mapfoldl(fun ({File,E}, I) -> {{File,{I,E}}, I-1} end, -1, Es),
map(fun ({File,EIs}) -> {File, map(fun ({_I,E}) -> E end, EIs)} end,
pack_warnings(Es1)).
%% pack_warnings([{File,ErrD}]) -> [{File,[ErrD]}]
%% Sort on line number.
pack_warnings(Ws) ->
[{File,lists:sort([W || {F,W} <- Ws, F =:= File])} ||
File <- lists:usort([F || {F,_} <- Ws])].
%% add_error(ErrorDescriptor, State) -> State'
%% add_error(Line, Error, State) -> State'
%% add_warning(ErrorDescriptor, State) -> State'
%% add_warning(Line, Error, State) -> State'
add_error(E, St) -> St#lint{errors=[{St#lint.file,E}|St#lint.errors]}.
add_error(FileLine, E, St) ->
{File,Location} = loc(FileLine),
add_error({Location,erl_lint,E}, St#lint{file = File}).
add_warning(W, St) -> St#lint{warnings=[{St#lint.file,W}|St#lint.warnings]}.
add_warning(FileLine, W, St) ->
{File,Location} = loc(FileLine),
add_warning({Location,erl_lint,W}, St#lint{file = File}).
loc(L) ->
case erl_parse:get_attribute(L, location) of
{location,{{File,Line},Column}} ->
{File,{Line,Column}};
{location,{File,Line}} ->
{File,Line}
end.
%% forms([Form], State) -> State'
forms(Forms0, St0) ->
Forms = eval_file_attribute(Forms0, St0),
Locals = local_functions(Forms),
AutoImportSuppressed = auto_import_suppressed(St0#lint.compile),
StDeprecated = disallowed_compile_flags(Forms,St0),
%% Line numbers are from now on pairs {File,Line}.
St1 = includes_qlc_hrl(Forms, StDeprecated#lint{locals = Locals,
no_auto = AutoImportSuppressed}),
St2 = bif_clashes(Forms, St1),
St3 = not_deprecated(Forms, St2),
St4 = foldl(fun form/2, pre_scan(Forms, St3), Forms),
post_traversal_check(Forms, St4).
pre_scan([{function,_L,new,_A,_Cs} | Fs], St) ->
pre_scan(Fs, St#lint{new=true});
pre_scan([{attribute,_L,extends,M} | Fs], St) when is_atom(M) ->
pre_scan(Fs, St#lint{extends=true});
pre_scan([{attribute,L,compile,C} | Fs], St) ->
case is_warn_enabled(export_all, St) andalso
member(export_all, lists:flatten([C])) of
true ->
pre_scan(Fs, add_warning(L, export_all, St));
false ->
pre_scan(Fs, St)
end;
pre_scan([_ | Fs], St) ->
pre_scan(Fs, St);
pre_scan([], St) ->
St.
includes_qlc_hrl(Forms, St) ->
%% QLC calls erl_lint several times, sometimes with the compile
%% attribute removed. The file attribute, however, is left as is.
QH = [File || {attribute,_,file,{File,_line}} <- Forms,
filename:basename(File) =:= "qlc.hrl"],
St#lint{xqlc = QH =/= []}.
eval_file_attribute(Forms, St) ->
eval_file_attr(Forms, St#lint.file).
eval_file_attr([{attribute,_L,file,{File,_Line}}=Form | Forms], _File) ->
[Form | eval_file_attr(Forms, File)];
eval_file_attr([Form0 | Forms], File) ->
Form = zip_file_and_line(Form0, File),
[Form | eval_file_attr(Forms, File)];
eval_file_attr([], _File) ->
[].
zip_file_and_line(T, File) ->
F0 = fun(Line) -> {File,Line} end,
F = fun(L) -> erl_parse:set_line(L, F0) end,
modify_line(T, F).
%% form(Form, State) -> State'
%% Check a form returning the updated State. Handle generic cases here.
form({error,E}, St) -> add_error(E, St);
form({warning,W}, St) -> add_warning(W, St);
form({attribute,_L,file,{File,_Line}}, St) ->
St#lint{file = File};
form({attribute,_L,compile,_}, St) ->
St;
form(Form, #lint{state=State}=St) ->
case State of
start -> start_state(Form, St);
attribute -> attribute_state(Form, St);
function -> function_state(Form, St)
end.
%% start_state(Form, State) -> State'
start_state({attribute,L,module,{M,Ps}}, St) ->
St1 = set_module(M, L, St),
Arity = length(Ps),
Ps1 = if is_atom(St1#lint.extends) ->
['BASE', 'THIS' | Ps];
true ->
['THIS' | Ps]
end,
Vt = orddict:from_list([{V, {bound, used, []}} || V <- Ps1]),
St2 = add_instance(Arity, St1),
St3 = ensure_new(Arity, St2),
St3#lint{state=attribute, extends=[], global_vt=Vt};
start_state({attribute,L,module,M}, St) ->
St1 = set_module(M, L, St),
St1#lint{state=attribute, extends=[]};
start_state(Form, St) ->
St1 = add_error(element(2, Form), undefined_module, St),
attribute_state(Form, St1#lint{state=attribute, extends=[]}).
set_module(M, L, St) ->
M1 = package_to_string(M),
case packages:is_valid(M1) of
true ->
St#lint{module=list_to_atom(M1),
package=packages:strip_last(M1)};
false ->
add_error(L, {bad_module_name, M1}, St)
end.
ensure_new(Arity, St) ->
case St#lint.new of
true ->
St;
false ->
add_func(new, Arity, St)
end.
add_instance(Arity, St) ->
A = Arity + (if is_atom(St#lint.extends) -> 1; true -> 0 end),
add_func(instance, A, St).
add_func(Name, Arity, St) ->
F = {Name, Arity},
St#lint{exports = gb_sets:add_element(F, St#lint.exports),
defined = gb_sets:add_element(F, St#lint.defined)}.
%% attribute_state(Form, State) ->
%% State'
attribute_state({attribute,_L,module,_M}, #lint{module=[]}=St) ->
St;
attribute_state({attribute,L,module,_M}, St) ->
add_error(L, redefine_module, St);
attribute_state({attribute,L,extends,M}, #lint{module=M}=St) when is_atom(M) ->
add_error(L, extends_self, St);
attribute_state({attribute,_L,extends,M}, #lint{extends=[]}=St)
when is_atom(M) ->
St#lint{extends=M};
attribute_state({attribute,L,extends,M}, St) when is_atom(M) ->
add_error(L, redefine_extends, St);
attribute_state({attribute,L,extends,_M}, St) ->
add_error(L, invalid_extends, St);
attribute_state({attribute,L,export,Es}, St) ->
export(L, Es, St);
attribute_state({attribute,L,export_type,Es}, St) ->
export_type(L, Es, St);
attribute_state({attribute,L,import,Is}, St) ->
import(L, Is, St);
attribute_state({attribute,L,record,{Name,Fields}}, St) ->
record_def(L, Name, Fields, St);
attribute_state({attribute,La,behaviour,Behaviour}, St) ->
St#lint{behaviour=St#lint.behaviour ++ [{La,Behaviour}]};
attribute_state({attribute,La,behavior,Behaviour}, St) ->
St#lint{behaviour=St#lint.behaviour ++ [{La,Behaviour}]};
attribute_state({attribute,L,type,{TypeName,TypeDef,Args}}, St) ->
type_def(type, L, TypeName, TypeDef, Args, St);
attribute_state({attribute,L,opaque,{TypeName,TypeDef,Args}}, St) ->
type_def(opaque, L, TypeName, TypeDef, Args, St);
attribute_state({attribute,L,spec,{Fun,Types}}, St) ->
spec_decl(L, Fun, Types, St);
attribute_state({attribute,L,callback,{Fun,Types}}, St) ->
callback_decl(L, Fun, Types, St);
attribute_state({attribute,L,on_load,Val}, St) ->
on_load(L, Val, St);
attribute_state({attribute,_L,_Other,_Val}, St) -> % Ignore others
St;
attribute_state(Form, St) ->
function_state(Form, St#lint{state=function}).
%% function_state(Form, State) ->
%% State'
%% Allow for record, type and opaque type definitions and spec
%% declarations to be intersperced within function definitions.
function_state({attribute,L,record,{Name,Fields}}, St) ->
record_def(L, Name, Fields, St);
function_state({attribute,L,type,{TypeName,TypeDef,Args}}, St) ->
type_def(type, L, TypeName, TypeDef, Args, St);
function_state({attribute,L,opaque,{TypeName,TypeDef,Args}}, St) ->
type_def(opaque, L, TypeName, TypeDef, Args, St);
function_state({attribute,L,spec,{Fun,Types}}, St) ->
spec_decl(L, Fun, Types, St);
function_state({attribute,La,Attr,_Val}, St) ->
add_error(La, {attribute,Attr}, St);
function_state({function,L,N,A,Cs}, St) ->
function(L, N, A, Cs, St);
function_state({rule,L,_N,_A,_Cs}, St) ->
add_error(L, {mnemosyne,"rule"}, St);
function_state({eof,L}, St) -> eof(L, St).
%% eof(LastLine, State) ->
%% State'
eof(_Line, St0) ->
St0.
%% bif_clashes(Forms, State0) -> State.
bif_clashes(Forms, St) ->
Nowarn = nowarn_function(nowarn_bif_clash, St#lint.compile),
Clashes0 = [{Name,Arity} || {function,_L,Name,Arity,_Cs} <- Forms,
erl_internal:bif(Name, Arity)],
Clashes = ordsets:subtract(ordsets:from_list(Clashes0), Nowarn),
St#lint{clashes=Clashes}.
%% not_deprecated(Forms, State0) -> State
not_deprecated(Forms, St0) ->
%% There are no line numbers in St0#lint.compile.
MFAsL = [{MFA,L} ||
{attribute, L, compile, Args} <- Forms,
{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),
St1#lint{not_deprecated = ordsets:from_list(Nowarn)}.
%% The nowarn_bif_clash directive is not only deprecated, it's actually an error from R14A
disallowed_compile_flags(Forms, St0) ->
%% There are (still) no line numbers in St0#lint.compile.
Errors0 = [ {St0#lint.file,{L,erl_lint,disallowed_nowarn_bif_clash}} ||
{attribute,[{line,{_,L}}],compile,nowarn_bif_clash} <- Forms ],
Errors1 = [ {St0#lint.file,{L,erl_lint,disallowed_nowarn_bif_clash}} ||
{attribute,[{line,{_,L}}],compile,{nowarn_bif_clash, {_,_}}} <- Forms ],
Disabled = (not is_warn_enabled(bif_clash, St0)),
Errors = if
Disabled andalso Errors0 =:= [] ->
[{St0#lint.file,{erl_lint,disallowed_nowarn_bif_clash}} | St0#lint.errors];
Disabled ->
Errors0 ++ Errors1 ++ St0#lint.errors;
true ->
Errors1 ++ St0#lint.errors
end,
St0#lint{errors=Errors}.
%% post_traversal_check(Forms, State0) -> State.
%% Do some further checking after the forms have been traversed and
%% data about calls etc. have been collected.
post_traversal_check(Forms, St0) ->
St1 = check_behaviour(St0),
St2 = check_deprecated(Forms, St1),
St3 = check_imports(Forms, St2),
St4 = check_inlines(Forms, St3),
St5 = check_undefined_functions(St4),
St6 = check_unused_functions(Forms, St5),
St7 = check_bif_clashes(Forms, St6),
St8 = check_specs_without_function(St7),
St9 = check_functions_without_spec(Forms, St8),
StA = check_undefined_types(St9),
StB = check_unused_types(Forms, StA),
StC = check_untyped_records(Forms, StB),
StD = check_on_load(StC),
StE = check_unused_records(Forms, StD),
check_callback_information(StE).
%% check_behaviour(State0) -> State
%% Check that the behaviour attribute is valid.
check_behaviour(St0) ->
behaviour_check(St0#lint.behaviour, St0).
%% behaviour_check([{Line,Behaviour}], State) -> State'
%% Check behaviours for existence and defined functions.
behaviour_check(Bs, St0) ->
{AllBfs,St1} = all_behaviour_callbacks(Bs, [], St0),
St = behaviour_missing_callbacks(AllBfs, St1),
behaviour_conflicting(AllBfs, St).
all_behaviour_callbacks([{Line,B}|Bs], Acc, St0) ->
{Bfs0,St} = behaviour_callbacks(Line, B, St0),
all_behaviour_callbacks(Bs, [{{Line,B},Bfs0}|Acc], St);
all_behaviour_callbacks([], Acc, St) -> {reverse(Acc),St}.
behaviour_callbacks(Line, B, St0) ->
try B:behaviour_info(callbacks) of
Funcs when is_list(Funcs) ->
All = all(fun({FuncName, Arity}) ->
is_atom(FuncName) andalso is_integer(Arity);
({FuncName, Arity, Spec}) ->
is_atom(FuncName) andalso is_integer(Arity)
andalso is_list(Spec);
(_Other) ->
false
end,
Funcs),
MaybeRemoveSpec = fun({_F,_A}=FA) -> FA;
({F,A,_S}) -> {F,A};
(Other) -> Other
end,
if
All =:= true ->
{[MaybeRemoveSpec(F) || F <- Funcs], St0};
true ->
St1 = add_warning(Line,
{ill_defined_behaviour_callbacks,B},
St0),
{[], St1}
end;
undefined ->
St1 = add_warning(Line, {undefined_behaviour_callbacks,B}, St0),
{[], St1};
_Other ->
St1 = add_warning(Line, {ill_defined_behaviour_callbacks,B}, St0),
{[], St1}
catch
_:_ ->
St1 = add_warning(Line, {undefined_behaviour,B}, St0),
{[], St1}
end.
behaviour_missing_callbacks([{{Line,B},Bfs}|T], #lint{exports=Exp}=St0) ->
Missing = ordsets:subtract(ordsets:from_list(Bfs), gb_sets:to_list(Exp)),
St = foldl(fun (F, S0) ->
add_warning(Line, {undefined_behaviour_func,F,B}, S0)
end, St0, Missing),
behaviour_missing_callbacks(T, St);
behaviour_missing_callbacks([], St) -> St.
behaviour_conflicting(AllBfs, St) ->
R0 = sofs:relation(AllBfs, [{item,[callback]}]),
R1 = sofs:family_to_relation(R0),
R2 = sofs:converse(R1),
R3 = sofs:relation_to_family(R2),
R4 = sofs:family_specification(fun(S) -> sofs:no_elements(S) > 1 end, R3),
R = sofs:to_external(R4),
behaviour_add_conflicts(R, St).
behaviour_add_conflicts([{Cb,[{FirstLoc,FirstB}|Cs]}|T], St0) ->
FirstL = element(2, loc(FirstLoc)),
St = behaviour_add_conflict(Cs, Cb, FirstL, FirstB, St0),
behaviour_add_conflicts(T, St);
behaviour_add_conflicts([], St) -> St.
behaviour_add_conflict([{Line,B}|Cs], Cb, FirstL, FirstB, St0) ->
St = add_warning(Line, {conflicting_behaviours,Cb,B,FirstL,FirstB}, St0),
behaviour_add_conflict(Cs, Cb, FirstL, FirstB, St);
behaviour_add_conflict([], _, _, _, St) -> St.
%% check_deprecated(Forms, State0) -> State
check_deprecated(Forms, St0) ->
%% Get the correct list of exported functions.
Exports = case member(export_all, St0#lint.compile) of
true -> St0#lint.defined;
false -> St0#lint.exports
end,
X = gb_sets:to_list(Exports),
#lint{module = Mod} = St0,
Bad = [{E,L} || {attribute, L, deprecated, Depr} <- Forms,
D <- lists:flatten([Depr]),
E <- depr_cat(D, X, Mod)],
foldl(fun ({E,L}, St1) ->
add_error(L, E, St1)
end, St0, Bad).
depr_cat({F, A, Flg}=D, X, Mod) ->
case deprecated_flag(Flg) of
false -> [{invalid_deprecated,D}];
true -> depr_fa(F, A, X, Mod)
end;
depr_cat({F, A}, X, Mod) ->
depr_fa(F, A, X, Mod);
depr_cat(module, _X, _Mod) ->
[];
depr_cat(D, _X, _Mod) ->
[{invalid_deprecated,D}].
depr_fa('_', '_', _X, _Mod) ->
[];
depr_fa(F, '_', X, _Mod) when is_atom(F) ->
%% Don't use this syntax for built-in functions.
case lists:filter(fun({F1,_}) -> F1 =:= F end, X) of
[] -> [{bad_deprecated,{F,'_'}}];
_ -> []
end;
depr_fa(F, A, X, Mod) when is_atom(F), is_integer(A), A >= 0 ->
case lists:member({F,A}, X) of
true -> [];
false ->
case erlang:is_builtin(Mod, F, A) of
true -> [];
false -> [{bad_deprecated,{F,A}}]
end
end;
depr_fa(F, A, _X, _Mod) ->
[{invalid_deprecated,{F,A}}].
deprecated_flag(next_version) -> true;
deprecated_flag(next_major_release) -> true;
deprecated_flag(eventually) -> true;
deprecated_flag(_) -> false.
%% check_imports(Forms, State0) -> State
check_imports(Forms, St0) ->
case is_warn_enabled(unused_import, St0) of
false ->
St0;
true ->