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%% Module responsible for tracking lexical information.
-module(elixir_lexical).
-export([run/3, with_file/3, trace/2, format_error/1]).
-include("elixir.hrl").
-define(tracker, 'Elixir.Kernel.LexicalTracker').
run(#{tracers := Tracers} = E, ExecutionCallback, AfterExecutionCallback) ->
case elixir_config:is_bootstrap() of
false ->
{ok, Pid} = ?tracker:start_link(),
LexEnv = E#{lexical_tracker := Pid, tracers := [?MODULE | Tracers]},
elixir_env:trace(start, LexEnv),
try ExecutionCallback(LexEnv) of
Res ->
warn_unused_aliases(Pid, LexEnv),
warn_unused_imports(Pid, LexEnv),
AfterExecutionCallback(LexEnv),
Res
after
elixir_env:trace(stop, LexEnv),
unlink(Pid),
?tracker:stop(Pid)
end;
true ->
ExecutionCallback(E),
AfterExecutionCallback(E)
end.
trace({import, Meta, Module, Opts}, #{lexical_tracker := Pid}) ->
{imported, Imported} = lists:keyfind(imported, 1, Meta),
Only =
case lists:keyfind(only, 1, Opts) of
{only, List} when is_list(List) -> List;
_ -> []
end,
?tracker:add_import(Pid, Module, Only, ?line(Meta), Imported and should_warn(Meta, Opts)),
ok;
trace({alias, Meta, _Old, New, Opts}, #{lexical_tracker := Pid}) ->
?tracker:add_alias(Pid, New, ?line(Meta), should_warn(Meta, Opts)),
ok;
trace({alias_expansion, _Meta, Lookup, _Result}, #{lexical_tracker := Pid}) ->
?tracker:alias_dispatch(Pid, Lookup),
ok;
trace({require, Meta, Module, _Opts}, #{lexical_tracker := Pid}) ->
case lists:keyfind(from_macro, 1, Meta) of
{from_macro, true} -> ?tracker:remote_dispatch(Pid, Module, compile);
_ -> ?tracker:add_export(Pid, Module)
end,
ok;
trace({struct_expansion, _Meta, Module, _Keys}, #{lexical_tracker := Pid}) ->
?tracker:add_export(Pid, Module),
ok;
trace({alias_reference, _Meta, Module}, #{lexical_tracker := Pid} = E) ->
case E of
%% Alias references inside patterns and guards in functions are not
%% compile time dependencies.
#{function := nil} -> ?tracker:remote_dispatch(Pid, Module, compile);
#{context := nil} -> ?tracker:remote_dispatch(Pid, Module, runtime);
#{} -> ok
end,
ok;
trace({remote_function, _Meta, Module, _Function, _Arity}, #{lexical_tracker := Pid} = E) ->
?tracker:remote_dispatch(Pid, Module, mode(E)),
ok;
trace({remote_macro, _Meta, Module, _Function, _Arity}, #{lexical_tracker := Pid}) ->
?tracker:remote_dispatch(Pid, Module, compile),
ok;
trace({imported_function, _Meta, Module, Function, Arity}, #{lexical_tracker := Pid} = E) ->
?tracker:import_dispatch(Pid, Module, {Function, Arity}, mode(E)),
ok;
trace({imported_macro, _Meta, Module, Function, Arity}, #{lexical_tracker := Pid}) ->
?tracker:import_dispatch(Pid, Module, {Function, Arity}, compile),
ok;
trace({imported_quoted, _Meta, Module, Function, Arities}, #{lexical_tracker := Pid}) ->
?tracker:import_quoted(Pid, Module, Function, Arities),
ok;
trace({compile_env, App, Path, Return}, #{lexical_tracker := Pid}) ->
?tracker:add_compile_env(Pid, App, Path, Return),
ok;
trace(_, _) ->
ok.
mode(#{function := nil}) -> compile;
mode(#{}) -> runtime.
should_warn(Meta, Opts) ->
case lists:keyfind(warn, 1, Opts) of
{warn, false} -> false;
{warn, true} -> true;
false -> not lists:keymember(context, 1, Meta)
end.
%% EXTERNAL SOURCES
with_file(File, #{lexical_tracker := nil} = E, Callback) ->
Callback(E#{file := File});
with_file(File, #{lexical_tracker := Pid} = E, Callback) ->
try
?tracker:set_file(Pid, File),
Callback(E#{file := File})
after
?tracker:reset_file(Pid)
end.
%% ERROR HANDLING
warn_unused_imports(Pid, E) ->
[elixir_errors:file_warn([{line, Line}], ?key(E, file), ?MODULE, {unused_import, ModOrMFA})
|| {Module, Imports} <- ?tracker:collect_unused_imports(Pid),
{ModOrMFA, Line} <- unused_imports_for_module(Module, Imports)],
ok.
unused_imports_for_module(Module, Imports) ->
case Imports of
#{Module := Line} -> [{Module, Line}];
#{} -> [{{Module, Fun, Arity}, Line} || {{Fun, Arity}, Line} <- maps:to_list(Imports)]
end.
warn_unused_aliases(Pid, E) ->
[elixir_errors:file_warn([{line, Line}], ?key(E, file), ?MODULE, {unused_alias, Module})
|| {Module, Line} <- ?tracker:collect_unused_aliases(Pid)],
ok.
format_error({unused_alias, Module}) ->
io_lib:format("unused alias ~ts", [elixir_aliases:inspect(Module)]);
format_error({unused_import, {Module, Function, Arity}}) ->
io_lib:format("unused import ~ts.~ts/~w", [elixir_aliases:inspect(Module), Function, Arity]);
format_error({unused_import, Module}) ->
io_lib:format("unused import ~ts", [elixir_aliases:inspect(Module)]).
|
