diff options
Diffstat (limited to 'lib/compiler/src/v3_kernel.erl')
| -rw-r--r-- | lib/compiler/src/v3_kernel.erl | 78 |
1 files changed, 46 insertions, 32 deletions
diff --git a/lib/compiler/src/v3_kernel.erl b/lib/compiler/src/v3_kernel.erl index 86351bc0c5..908d34e1b4 100644 --- a/lib/compiler/src/v3_kernel.erl +++ b/lib/compiler/src/v3_kernel.erl @@ -1590,19 +1590,12 @@ match_var([U|Us], Cs0, Def, St) -> %% constructor/constant as first argument. Group the constructors %% according to type, the order is really irrelevant but tries to be %% smart. - -match_con(Us, Cs0, Def, St) -> - %% Expand literals at the top level. - Cs = [expand_pat_lit_clause(C) || C <- Cs0], - match_con_1(Us, Cs, Def, St). - -match_con_1([U|_Us] = L, Cs, Def, St0) -> +match_con([U|_Us] = L, Cs, Def, St0) -> %% Extract clauses for different constructors (types). %%ok = io:format("match_con ~p~n", [Cs]), - Ttcs0 = select_types([k_binary], Cs) ++ select_bin_con(Cs) ++ - select_types([k_cons,k_tuple,k_map,k_atom,k_float, - k_int,k_nil], Cs), - Ttcs = opt_single_valued(Ttcs0), + Ttcs0 = select_types(Cs, [], [], [], [], [], [], [], [], []), + Ttcs1 = [{T, Types} || {T, [_ | _] = Types} <- Ttcs0], + Ttcs = opt_single_valued(Ttcs1), %%ok = io:format("ttcs = ~p~n", [Ttcs]), {Scs,St1} = mapfoldl(fun ({T,Tcs}, St) -> @@ -1613,8 +1606,41 @@ match_con_1([U|_Us] = L, Cs, Def, St0) -> St0, Ttcs), {build_alt_1st_no_fail(build_select(U, Scs), Def),St1}. -select_types(Types, Cs) -> - [{T,Tcs} || T <- Types, begin Tcs = select(T, Cs), Tcs =/= [] end]. +select_types([NoExpC | Cs], Bin, BinCon, Cons, Tuple, Map, Atom, Float, Int, Nil) -> + C = expand_pat_lit_clause(NoExpC), + case clause_con(C) of + k_binary -> + select_types(Cs, [C |Bin], BinCon, Cons, Tuple, Map, Atom, Float, Int, Nil); + k_bin_seg -> + select_types(Cs, Bin, [C | BinCon], Cons, Tuple, Map, Atom, Float, Int, Nil); + k_bin_end -> + select_types(Cs, Bin, [C | BinCon], Cons, Tuple, Map, Atom, Float, Int, Nil); + k_cons -> + select_types(Cs, Bin, BinCon, [C | Cons], Tuple, Map, Atom, Float, Int, Nil); + k_tuple -> + select_types(Cs, Bin, BinCon, Cons, [C | Tuple], Map, Atom, Float, Int, Nil); + k_map -> + select_types(Cs, Bin, BinCon, Cons, Tuple, [C | Map], Atom, Float, Int, Nil); + k_atom -> + select_types(Cs, Bin, BinCon, Cons, Tuple, Map, [C | Atom], Float, Int, Nil); + k_float -> + select_types(Cs, Bin, BinCon, Cons, Tuple, Map, Atom, [C | Float], Int, Nil); + k_int -> + select_types(Cs, Bin, BinCon, Cons, Tuple, Map, Atom, Float, [C | Int], Nil); + k_nil -> + select_types(Cs, Bin, BinCon, Cons, Tuple, Map, Atom, Float, Int, [C | Nil]) + end; +select_types([], Bin, BinCon, Cons, Tuple, Map, Atom, Float, Int, Nil) -> + [{k_binary, reverse(Bin)}] ++ handle_bin_con(reverse(BinCon)) ++ + [ + {k_cons, reverse(Cons)}, + {k_tuple, reverse(Tuple)}, + {k_map, reverse(Map)}, + {k_atom, reverse(Atom)}, + {k_float, reverse(Float)}, + {k_int, reverse(Int)}, + {k_nil, reverse(Nil)} + ]. expand_pat_lit_clause(#iclause{pats=[#ialias{pat=#k_literal{anno=A,val=Val}}=Alias|Ps]}=C) -> P = expand_pat_lit(Val, A), @@ -1743,20 +1769,12 @@ combine_bin_segs(#k_bin_end{}) -> combine_bin_segs(_) -> throw(not_possible). -%% select_bin_con([Clause]) -> [{Type,[Clause]}]. -%% Extract clauses for the k_bin_seg constructor. As k_bin_seg +%% handle_bin_con([Clause]) -> [{Type,[Clause]}]. +%% Handle clauses for the k_bin_seg constructor. As k_bin_seg %% matching can overlap, the k_bin_seg constructors cannot be %% reordered, only grouped. -select_bin_con(Cs0) -> - Cs1 = lists:filter(fun (C) -> - Con = clause_con(C), - (Con =:= k_bin_seg) or (Con =:= k_bin_end) - end, Cs0), - select_bin_con_1(Cs1). - - -select_bin_con_1(Cs) -> +handle_bin_con(Cs) -> try %% The usual way to match literals is to first extract the %% value to a register, and then compare the register to the @@ -1795,14 +1813,14 @@ select_bin_con_1(Cs) -> end catch throw:not_possible -> - select_bin_con_2(Cs) + handle_bin_con_not_possible(Cs) end. -select_bin_con_2([C1|Cs]) -> +handle_bin_con_not_possible([C1|Cs]) -> Con = clause_con(C1), {More,Rest} = splitwith(fun (C) -> clause_con(C) =:= Con end, Cs), - [{Con,[C1|More]}|select_bin_con_2(Rest)]; -select_bin_con_2([]) -> []. + [{Con,[C1|More]}|handle_bin_con_not_possible(Rest)]; +handle_bin_con_not_possible([]) -> []. %% select_bin_int([Clause]) -> {k_bin_int,[Clause]} %% If the first pattern in each clause selects the same integer, @@ -1902,10 +1920,6 @@ select_utf8(Val0) -> throw(not_possible) end. -%% select(Con, [Clause]) -> [Clause]. - -select(T, Cs) -> [ C || C <- Cs, clause_con(C) =:= T ]. - %% match_value([Var], Con, [Clause], Default, State) -> {SelectExpr,State}. %% At this point all the clauses have the same constructor, we must %% now separate them according to value. |