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-rw-r--r--lib/compiler/src/sys_core_fold.erl61
1 files changed, 32 insertions, 29 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index 79a45b1c7c..b8df4e04f8 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -2018,10 +2018,10 @@ case_opt_lit_1(_, []) -> [].
%% the clauses where it is actually needed.
case_opt_data(E, Cs0) ->
- Es = cerl:data_es(E),
TypeSig = {cerl:data_type(E),cerl:data_arity(E)},
- try case_opt_data_1(Cs0, Es, TypeSig) of
+ try case_opt_data_1(Cs0, TypeSig) of
Cs ->
+ Es = cerl:data_es(E),
{ok,Es,Cs}
catch
throw:impossible ->
@@ -2029,44 +2029,47 @@ case_opt_data(E, Cs0) ->
{error,Cs0}
end.
-case_opt_data_1([{[P0|Ps0],C,PsAcc,Bs0}|Cs], Es, TypeSig) ->
+case_opt_data_1([{[P0|Ps0],C,PsAcc,Bs0}|Cs], TypeSig) ->
P = case_opt_compiler_generated(P0),
- BindTo = #c_var{name=dummy},
- {Ps1,[{BindTo,_}|Bs1]} = case_data_pat_alias(P, BindTo, TypeSig, []),
- [{Ps1++Ps0,C,PsAcc,Bs1++Bs0}|case_opt_data_1(Cs, Es, TypeSig)];
-case_opt_data_1([], _, _) -> [].
+ {Ps1,Bs} = case_opt_data_2(P, TypeSig, Bs0),
+ [{Ps1++Ps0,C,PsAcc,Bs}|case_opt_data_1(Cs, TypeSig)];
+case_opt_data_1([], _) -> [].
-case_data_pat_alias(P, BindTo0, TypeSig, Bs0) ->
- case cerl:type(P) of
- alias ->
- %% Recursively handle the pattern and bind to
- %% the alias variable.
- BindTo = cerl:alias_var(P),
- Apat0 = cerl:alias_pat(P),
- Ann = [compiler_generated],
- Apat = cerl:set_ann(Apat0, Ann),
- {Ps,Bs} = case_data_pat_alias(Apat, BindTo, TypeSig, Bs0),
- {Ps,[{BindTo0,BindTo}|Bs]};
- var ->
- %% Here we will need to actually build the data and bind
- %% it to the variable.
+case_opt_data_2(P, TypeSig, Bs0) ->
+ case case_analyze_pat(P) of
+ {[],Pat} when Pat =/= none ->
+ DataEs = cerl:data_es(P),
+ {DataEs,Bs0};
+ {[V|Vs],none} ->
{Type,Arity} = TypeSig,
Ann = [compiler_generated],
Vars = make_vars(Ann, Arity),
Data = cerl:ann_make_data(Ann, Type, Vars),
- Bs = [{BindTo0,P},{P,Data}|Bs0],
+ Bs = [{V,Data} | [{Var,V} || Var <- Vs] ++ Bs0],
{Vars,Bs};
- _ ->
- %% Since case_opt_nomatch/3 has removed all clauses that
- %% cannot match, we KNOW that this clause must match and
- %% that the pattern must be a data constructor.
- %% Here we must build the data and bind it to the variable.
+ {[V|Vs],Pat} when Pat =/= none ->
{Type,_} = TypeSig,
- DataEs = cerl:data_es(P),
+ DataEs = cerl:data_es(Pat),
Vars = pat_to_expr_list(DataEs),
Ann = [compiler_generated],
Data = cerl:ann_make_data(Ann, Type, Vars),
- {DataEs,[{BindTo0,Data}]}
+ Bs = [{V,Data} | [{Var,V} || Var <- Vs] ++ Bs0],
+ {DataEs,Bs}
+ end.
+
+case_analyze_pat(P) ->
+ case_analyze_pat_1(P, [], none).
+
+case_analyze_pat_1(P, Vs, Pat) ->
+ case cerl:type(P) of
+ alias ->
+ V = cerl:alias_var(P),
+ Apat = cerl:alias_pat(P),
+ case_analyze_pat_1(Apat, [V|Vs], Pat);
+ var ->
+ {[P|Vs],Pat};
+ _ ->
+ {Vs,P}
end.
%% pat_to_expr(Pattern) -> Expression.