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sys_core_bsm: specs #10098

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8 changes: 8 additions & 0 deletions lib/compiler/src/sys_core_bsm.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,7 @@


-module(sys_core_bsm).
-compile(warn_missing_spec_all).
-moduledoc false.
-export([module/2]).

Expand All @@ -33,6 +34,7 @@
module(#c_module{defs=Ds}=Mod, _Opts) ->
{ok,Mod#c_module{defs=function(Ds)}}.

-spec function([{cerl:c_var(), cerl:cerl()}]) -> [{cerl:c_var(), cerl:cerl()}].
function([{#c_var{name={F,Arity}}=Name,B0}|Fs]) ->
try cerl_trees:map(fun bsm_reorder/1, B0) of
B -> [{Name,B} | function(Fs)]
Expand All @@ -46,13 +48,15 @@ function([]) ->

%%% Reorder bit syntax matching to facilitate optimization in further passes.

-spec bsm_reorder(cerl:cerl()) -> cerl:cerl().
bsm_reorder(#c_case{arg=#c_var{}=V}=Case) ->
bsm_reorder_1([V], Case);
bsm_reorder(#c_case{arg=#c_values{es=Es}}=Case) ->
bsm_reorder_1(Es, Case);
bsm_reorder(Core) ->
Core.

-spec bsm_reorder_1([cerl:cerl()], cerl:c_case()) -> cerl:cerl().
bsm_reorder_1(Vs0, #c_case{clauses=Cs0}=Case) ->
case bsm_leftmost(Cs0) of
Pos when Pos > 0, Pos =/= none ->
Expand All @@ -64,6 +68,7 @@ bsm_reorder_1(Vs0, #c_case{clauses=Cs0}=Case) ->
Case
end.

-spec move_from_col(integer(), [cerl:cerl()]) -> [cerl:cerl()].
move_from_col(Pos, L) ->
{First,[Col|Rest]} = lists:split(Pos - 1, L),
[Col|First] ++ Rest.
Expand All @@ -72,15 +77,18 @@ move_from_col(Pos, L) ->
%% Find the leftmost argument that matches a nonempty binary.
%% Return either 'none' or the argument number (1-N).

-spec bsm_leftmost([cerl:c_clause()]) -> integer() | none.
bsm_leftmost(Cs) ->
bsm_leftmost_1(Cs, none).

-spec bsm_leftmost_1([cerl:c_clause()], integer() | none) -> integer() | none.
bsm_leftmost_1([_|_], 1) ->
1;
bsm_leftmost_1([#c_clause{pats=Ps}|Cs], Pos) ->
bsm_leftmost_2(Ps, Cs, 1, Pos);
bsm_leftmost_1([], Pos) -> Pos.

-spec bsm_leftmost_2([cerl:cerl()], [cerl:c_clause()], integer(), integer() | none) -> integer() | none.
bsm_leftmost_2(_, Cs, Pos, Pos) ->
bsm_leftmost_1(Cs, Pos);
bsm_leftmost_2([#c_binary{segments=[_|_]}|_], Cs, N, _) ->
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