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-rw-r--r--lib/compiler/src/v3_kernel.erl168
1 files changed, 129 insertions, 39 deletions
diff --git a/lib/compiler/src/v3_kernel.erl b/lib/compiler/src/v3_kernel.erl
index 1fc05109c5..3eea058153 100644
--- a/lib/compiler/src/v3_kernel.erl
+++ b/lib/compiler/src/v3_kernel.erl
@@ -82,7 +82,8 @@
-export([module/2,format_error/1]).
-import(lists, [map/2,foldl/3,foldr/3,mapfoldl/3,splitwith/2,member/2,
- keymember/3,keyfind/3,partition/2,droplast/1,last/1,sort/1]).
+ keymember/3,keyfind/3,partition/2,droplast/1,last/1,sort/1,
+ reverse/1]).
-import(ordsets, [add_element/2,del_element/2,union/2,union/1,subtract/2]).
-import(cerl, [c_tuple/1]).
@@ -159,8 +160,7 @@ function({#c_var{name={F,Arity}=FA},Body}, St0) ->
{#ifun{anno=Ab,vars=Kvs,body=B0},[],St2} = expr(Body, new_sub(), St1),
{B1,_,St3} = ubody(B0, return, St2),
%%B1 = B0, St3 = St2, %Null second pass
- {#k_fdef{anno=#k{us=[],ns=[],a=Ab},
- func=F,arity=Arity,vars=Kvs,body=B1},St3}
+ {make_fdef(#k{us=[],ns=[],a=Ab}, F, Arity, Kvs, B1),St3}
catch
Class:Error ->
Stack = erlang:get_stacktrace(),
@@ -1589,23 +1589,18 @@ match_var([U|Us], Cs0, Def, St) ->
%% according to type, the order is really irrelevant but tries to be
%% smart.
-match_con(Us, [C], Def, St) ->
- %% There is only one clause. We can keep literal tuples and
- %% lists, but we must convert []/integer/float/atom literals
- %% to the proper record (#k_nil{} and so on).
- Cs = [expand_pat_lit_clause(C, false)],
- match_con_1(Us, Cs, Def, St);
match_con(Us, Cs0, Def, St) ->
- %% More than one clause. Remove literals at the top level.
- Cs = [expand_pat_lit_clause(C, true) || C <- Cs0],
+ %% 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) ->
%% Extract clauses for different constructors (types).
%%ok = io:format("match_con ~p~n", [Cs]),
- Ttcs = 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,k_literal], 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),
%%ok = io:format("ttcs = ~p~n", [Ttcs]),
{Scs,St1} =
mapfoldl(fun ({T,Tcs}, St) ->
@@ -1618,28 +1613,14 @@ match_con_1([U|_Us] = L, Cs, Def, St0) ->
select_types(Types, Cs) ->
[{T,Tcs} || T <- Types, begin Tcs = select(T, Cs), Tcs =/= [] end].
-
-expand_pat_lit_clause(#iclause{pats=[#ialias{pat=#k_literal{anno=A,val=Val}}=Alias|Ps]}=C, B) ->
- P = case B of
- true -> expand_pat_lit(Val, A);
- false -> literal(Val, A)
- end,
+
+expand_pat_lit_clause(#iclause{pats=[#ialias{pat=#k_literal{anno=A,val=Val}}=Alias|Ps]}=C) ->
+ P = expand_pat_lit(Val, A),
C#iclause{pats=[Alias#ialias{pat=P}|Ps]};
-expand_pat_lit_clause(#iclause{pats=[#k_literal{anno=A,val=Val}|Ps]}=C, B) ->
- P = case B of
- true -> expand_pat_lit(Val, A);
- false -> literal(Val, A)
- end,
+expand_pat_lit_clause(#iclause{pats=[#k_literal{anno=A,val=Val}|Ps]}=C) ->
+ P = expand_pat_lit(Val, A),
C#iclause{pats=[P|Ps]};
-expand_pat_lit_clause(#iclause{pats=[#k_binary{anno=A,segs=#k_bin_end{}}|Ps]}=C, B) ->
- case B of
- true ->
- C;
- false ->
- P = #k_literal{anno=A,val = <<>>},
- C#iclause{pats=[P|Ps]}
- end;
-expand_pat_lit_clause(C, _) -> C.
+expand_pat_lit_clause(C) -> C.
expand_pat_lit([H|T], A) ->
#k_cons{anno=A,hd=literal(H, A),tl=literal(T, A)};
@@ -1659,6 +1640,107 @@ literal(Val, A) when is_atom(Val) ->
literal(Val, A) when is_list(Val); is_tuple(Val) ->
#k_literal{anno=A,val=Val}.
+%% opt_singled_valued([{Type,Clauses}]) -> [{Type,Clauses}].
+%% If a type only has one clause and if the pattern is literal,
+%% the matching can be done more efficiently by directly comparing
+%% with the literal (that is especially true for binaries).
+
+opt_single_valued(Ttcs) ->
+ opt_single_valued(Ttcs, [], []).
+
+opt_single_valued([{_,[#iclause{pats=[P0|Ps]}=Tc]}=Ttc|Ttcs], TtcAcc, LitAcc) ->
+ try combine_lit_pat(P0) of
+ P ->
+ LitTtc = Tc#iclause{pats=[P|Ps]},
+ opt_single_valued(Ttcs, TtcAcc, [LitTtc|LitAcc])
+ catch
+ not_possible ->
+ opt_single_valued(Ttcs, [Ttc|TtcAcc], LitAcc)
+ end;
+opt_single_valued([Ttc|Ttcs], TtcAcc, LitAcc) ->
+ opt_single_valued(Ttcs, [Ttc|TtcAcc], LitAcc);
+opt_single_valued([], TtcAcc, []) ->
+ reverse(TtcAcc);
+opt_single_valued([], TtcAcc, LitAcc) ->
+ Literals = {k_literal,reverse(LitAcc)},
+ %% Test the literals as early as possible.
+ case reverse(TtcAcc) of
+ [{k_binary,_}=Bin|Ttcs] ->
+ %% The delayed creation of sub binaries requires
+ %% bs_start_match2 to be the first instruction in the
+ %% function.
+ [Bin,Literals|Ttcs];
+ Ttcs ->
+ [Literals|Ttcs]
+ end.
+
+combine_lit_pat(#ialias{pat=Pat0}=Alias) ->
+ Pat = combine_lit_pat(Pat0),
+ Alias#ialias{pat=Pat};
+combine_lit_pat(Pat) ->
+ case do_combine_lit_pat(Pat) of
+ #k_literal{val=Val} when is_atom(Val) ->
+ throw(not_possible);
+ #k_literal{val=Val} when is_number(Val) ->
+ throw(not_possible);
+ #k_literal{val=[]} ->
+ throw(not_possible);
+ #k_literal{}=Lit ->
+ Lit
+ end.
+
+do_combine_lit_pat(#k_atom{anno=A,val=Val}) ->
+ #k_literal{anno=A,val=Val};
+do_combine_lit_pat(#k_float{anno=A,val=Val}) ->
+ #k_literal{anno=A,val=Val};
+do_combine_lit_pat(#k_int{anno=A,val=Val}) ->
+ #k_literal{anno=A,val=Val};
+do_combine_lit_pat(#k_nil{anno=A}) ->
+ #k_literal{anno=A,val=[]};
+do_combine_lit_pat(#k_binary{anno=A,segs=Segs}) ->
+ Bin = combine_bin_segs(Segs),
+ #k_literal{anno=A,val=Bin};
+do_combine_lit_pat(#k_cons{anno=A,hd=Hd0,tl=Tl0}) ->
+ #k_literal{val=Hd} = do_combine_lit_pat(Hd0),
+ #k_literal{val=Tl} = do_combine_lit_pat(Tl0),
+ #k_literal{anno=A,val=[Hd|Tl]};
+do_combine_lit_pat(#k_literal{}=Lit) ->
+ Lit;
+do_combine_lit_pat(#k_tuple{anno=A,es=Es0}) ->
+ Es = [begin
+ #k_literal{val=Lit} = do_combine_lit_pat(El),
+ Lit
+ end || El <- Es0],
+ #k_literal{anno=A,val=list_to_tuple(Es)};
+do_combine_lit_pat(_) ->
+ throw(not_possible).
+
+combine_bin_segs(#k_bin_seg{size=Size0,unit=Unit,type=integer,
+ flags=[unsigned,big],seg=Seg,next=Next}) ->
+ #k_literal{val=Size1} = do_combine_lit_pat(Size0),
+ #k_literal{val=Int} = do_combine_lit_pat(Seg),
+ Size = Size1 * Unit,
+ if
+ 0 < Size, Size < 64 ->
+ Bin = <<Int:Size>>,
+ case Bin of
+ <<Int:Size>> ->
+ NextBin = combine_bin_segs(Next),
+ <<Bin/bits,NextBin/bits>>;
+ _ ->
+ %% The integer Int does not fit in the segment,
+ %% thus it will not match.
+ throw(not_possible)
+ end;
+ true ->
+ %% Avoid creating huge binary literals.
+ throw(not_possible)
+ end;
+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
%% matching can overlap, the k_bin_seg constructors cannot be
@@ -2179,9 +2261,8 @@ iletrec_funs_gen(Fs, FreeVs, St) ->
Arity0 = length(Vs),
{Fb1,_,Lst1} = ubody(Fb0, return, Lst0#kern{ff={N,Arity0}}),
Arity = Arity0 + length(FreeVs),
- Fun = #k_fdef{anno=#k{us=[],ns=[],a=Fa},
- func=N,arity=Arity,
- vars=Vs ++ FreeVs,body=Fb1},
+ Fun = make_fdef(#k{us=[],ns=[],a=Fa}, N, Arity,
+ Vs++FreeVs, Fb1),
Lst1#kern{funs=[Fun|Lst1#kern.funs]}
end, St, Fs).
@@ -2325,8 +2406,7 @@ uexpr(#ifun{anno=A,vars=Vs,body=B0}, {break,Rs}, St0) ->
%% No id annotation. Must invent a fun name.
new_fun_name(St1)
end,
- Fun = #k_fdef{anno=#k{us=[],ns=[],a=A},func=Fname,arity=Arity,
- vars=Vs ++ Fvs,body=B1},
+ Fun = make_fdef(#k{us=[],ns=[],a=A}, Fname, Arity, Vs++Fvs, B1),
{#k_bif{anno=#k{us=Free,ns=lit_list_vars(Rs),a=A},
op=#k_internal{name=make_fun,arity=length(Free)+2},
args=[#k_atom{val=Fname},#k_int{val=Arity}|Fvs],
@@ -2343,6 +2423,16 @@ uexpr(Lit, {break,Rs0}, St0) ->
add_local_function(_, #kern{funs=ignore}=St) -> St;
add_local_function(F, #kern{funs=Funs}=St) -> St#kern{funs=[F|Funs]}.
+%% Make a #k_fdef{}, making sure that the body is always a #k_match{}.
+make_fdef(Anno, Name, Arity, Vs, #k_match{}=Body) ->
+ #k_fdef{anno=Anno,func=Name,arity=Arity,vars=Vs,body=Body};
+make_fdef(Anno, Name, Arity, Vs, Body) ->
+ Ka = get_kanno(Body),
+ Match = #k_match{anno=#k{us=Ka#k.us,ns=[],a=Ka#k.a},
+ vars=Vs,body=Body,ret=[]},
+ #k_fdef{anno=Anno,func=Name,arity=Arity,vars=Vs,body=Match}.
+
+
%% handle_reuse_annos([#k_var{}], State) -> State.
%% In general, it is only safe to reuse a variable for a match context
%% if the original value of the variable will no longer be needed.
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-06 05:41:36 +0000