diff options
Diffstat (limited to 'lib/compiler/src/v3_kernel.erl')
| -rw-r--r-- | lib/compiler/src/v3_kernel.erl | 48 |
1 files changed, 6 insertions, 42 deletions
diff --git a/lib/compiler/src/v3_kernel.erl b/lib/compiler/src/v3_kernel.erl index aef0b6cc9f..f7ca66b1da 100644 --- a/lib/compiler/src/v3_kernel.erl +++ b/lib/compiler/src/v3_kernel.erl @@ -82,8 +82,7 @@ -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, - reverse/1]). + 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]). @@ -1416,7 +1415,6 @@ is_remote_bif(_, _, _) -> false. %% called for effect only. bif_vals(dsetelement, 3) -> 0; -bif_vals(bs_context_to_binary, 1) -> 0; bif_vals(_, _) -> 1. bif_vals(_, _, _) -> 1. @@ -2043,9 +2041,6 @@ get_match(#k_cons{}, St0) -> get_match(#k_binary{}, St0) -> {[V]=Mes,St1} = new_vars(1, St0), {#k_binary{segs=V},Mes,St1}; -get_match(#k_bin_seg{size=#k_atom{val=all},next={k_bin_end,[]}}=Seg, St0) -> - {[S]=Vars,St1} = new_vars(1, St0), - {Seg#k_bin_seg{seg=S,next=[]},Vars,St1}; get_match(#k_bin_seg{}=Seg, St0) -> {[S,N0],St1} = new_vars(2, St0), N = set_kanno(N0, [no_usage]), @@ -2073,9 +2068,6 @@ new_clauses(Cs0, U, St) -> #k_cons{hd=H,tl=T} -> [H,T|As]; #k_tuple{es=Es} -> Es ++ As; #k_binary{segs=E} -> [E|As]; - #k_bin_seg{size=#k_atom{val=all}, - seg=S,next={k_bin_end,[]}} -> - [S|As]; #k_bin_seg{seg=S,next=N} -> [S,N|As]; #k_bin_int{next=N} -> @@ -2343,8 +2335,7 @@ uexpr(#k_bif{anno=A,op=Op,args=As}=Bif, {break,Rs}, St0) -> {Brs,St1} = bif_returns(Op, Rs, St0), {Bif#k_bif{anno=#k{us=Used,ns=lit_list_vars(Brs),a=A},ret=Brs}, Used,St1}; -uexpr(#k_match{anno=A,vars=Vs0,body=B0}, Br, St0) -> - Vs = handle_reuse_annos(Vs0, St0), +uexpr(#k_match{anno=A,vars=Vs,body=B0}, Br, St0) -> Rs = break_rets(Br), {B1,Bu,St1} = umatch(B0, Br, St0), case is_in_guard(St1) of @@ -2374,9 +2365,10 @@ uexpr(#k_try{anno=A,arg=A0,vars=Vs,body=B0,evars=Evs,handler=H0}, true -> {[#k_var{name=X}],#k_var{name=X}} = {Vs,B0}, %Assertion. #k_atom{val=false} = H0, %Assertion. - {A1,Bu,St1} = uexpr(A0, Br, St0), + {Avs,St1} = new_vars(length(Rs0), St0), + {A1,Bu,St} = uexpr(A0, {break,Avs}, St1), {#k_protected{anno=#k{us=Bu,ns=lit_list_vars(Rs0),a=A}, - arg=A1,ret=Rs0},Bu,St1}; + arg=A1,ret=Rs0,inner=Avs},Bu,St}; false -> {Avs,St1} = new_vars(length(Vs), St0), {A1,Au,St2} = ubody(A0, {break,Avs}, St1), @@ -2446,33 +2438,6 @@ make_fdef(Anno, Name, Arity, Vs, Body) -> 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. -%% -%% If a variable has been bound in an outer letrec and is therefore -%% free in the current function, the variable may still be used. -%% We don't bother to check whether the variable is actually used, -%% but simply clears the 'reuse_for_context' annotation for any variable -%% that is free. -handle_reuse_annos(Vs, St) -> - [handle_reuse_anno(V, St) || V <- Vs]. - -handle_reuse_anno(#k_var{anno=A}=V, St) -> - case member(reuse_for_context, A) of - false -> V; - true -> handle_reuse_anno_1(V, St) - end. - -handle_reuse_anno_1(#k_var{anno=Anno,name=Vname}=V, #kern{ff={F,A}}=St) -> - FreeVs = get_free(F, A, St), - case keymember(Vname, #k_var.name, FreeVs) of - true -> V#k_var{anno=Anno--[reuse_for_context]}; - false -> V - end; -handle_reuse_anno_1(V, _St) -> V. - %% get_free(Name, Arity, State) -> [Free]. %% store_free(Name, Arity, [Free], State) -> State. @@ -2516,8 +2481,7 @@ umatch(#k_alt{anno=A,first=F0,then=T0}, Br, St0) -> Used = union(Fu, Tu), {#k_alt{anno=#k{us=Used,ns=[],a=A},first=F1,then=T1}, Used,St2}; -umatch(#k_select{anno=A,var=V0,types=Ts0}, Br, St0) -> - V = handle_reuse_anno(V0, St0), +umatch(#k_select{anno=A,var=V,types=Ts0}, Br, St0) -> {Ts1,Tus,St1} = umatch_list(Ts0, Br, St0), Used = case member(no_usage, get_kanno(V)) of true -> Tus; |