diff options
Diffstat (limited to 'lib/compiler/src/beam_except.erl')
| -rw-r--r-- | lib/compiler/src/beam_except.erl | 122 |
1 files changed, 84 insertions, 38 deletions
diff --git a/lib/compiler/src/beam_except.erl b/lib/compiler/src/beam_except.erl index 05c0f4fbc7..49bfb5606f 100644 --- a/lib/compiler/src/beam_except.erl +++ b/lib/compiler/src/beam_except.erl @@ -31,7 +31,7 @@ %%% erlang:error(function_clause, Args) => jump FuncInfoLabel %%% --import(lists, [reverse/1]). +-import(lists, [reverse/1,seq/2,splitwith/2]). -spec module(beam_utils:module_code(), [compile:option()]) -> {'ok',beam_utils:module_code()}. @@ -74,13 +74,13 @@ translate([I|Is], St, Acc) -> translate([], _, Acc) -> reverse(Acc). -translate_1(Ar, I, Is, St, [{line,_}=Line|Acc1]=Acc0) -> - case dig_out(Ar, Acc1) of +translate_1(Ar, I, Is, #st{arity=Arity}=St, [{line,_}=Line|Acc1]=Acc0) -> + case dig_out(Ar, Arity, Acc1) of no -> translate(Is, St, [I|Acc0]); - {yes,{function_clause,Arity},Acc2} -> + {yes,function_clause,Acc2} -> case {Line,St} of - {{line,Loc},#st{lbl=Fi,loc=Loc,arity=Arity}} -> + {{line,Loc},#st{lbl=Fi,loc=Loc}} -> Instr = {jump,{f,Fi}}, translate(Is, St, [Instr|Acc2]); {_,_} -> @@ -92,9 +92,13 @@ translate_1(Ar, I, Is, St, [{line,_}=Line|Acc1]=Acc0) -> translate(Is, St, [Instr,Line|Acc2]) end. -dig_out(Ar, [{kill,_}|Is]) -> - dig_out(Ar, Is); -dig_out(1, [{block,Bl0}|Is]) -> +dig_out(1, _Arity, Is) -> + dig_out(Is); +dig_out(2, Arity, Is) -> + dig_out_fc(Arity, Is); +dig_out(_, _, _) -> no. + +dig_out([{block,Bl0}|Is]) -> case dig_out_block(reverse(Bl0)) of no -> no; {yes,What,[]} -> @@ -102,25 +106,13 @@ dig_out(1, [{block,Bl0}|Is]) -> {yes,What,Bl} -> {yes,What,[{block,Bl}|Is]} end; -dig_out(2, [{block,Bl}|Is]) -> - case dig_out_block_fc(Bl) of - no -> no; - {yes,What} -> {yes,What,Is} - end; -dig_out(_, _) -> no. +dig_out(_) -> no. dig_out_block([{set,[{x,0}],[{atom,if_clause}],move}]) -> {yes,if_end,[]}; dig_out_block([{set,[{x,0}],[{literal,{Exc,Value}}],move}|Is]) -> translate_exception(Exc, {literal,Value}, Is, 0); -dig_out_block([{set,[{x,0}],[Tuple],move}, - {set,[],[Value],put}, - {set,[],[{atom,Exc}],put}, - {set,[Tuple],[],{put_tuple,2}}|Is]) -> - translate_exception(Exc, Value, Is, 3); -dig_out_block([{set,[],[Value],put}, - {set,[],[{atom,Exc}],put}, - {set,[{x,0}],[],{put_tuple,2}}|Is]) -> +dig_out_block([{set,[{x,0}],[{atom,Exc},Value],put_tuple2}|Is]) -> translate_exception(Exc, Value, Is, 3); dig_out_block(_) -> no. @@ -138,23 +130,77 @@ fix_block(Is, Words) -> reverse(fix_block_1(Is, Words)). fix_block_1([{set,[],[],{alloc,Live,{F1,F2,Needed0,F3}}}|Is], Words) -> - Needed = Needed0 - Words, - true = Needed >= 0, %Assertion. - [{set,[],[],{alloc,Live,{F1,F2,Needed,F3}}}|Is]; + case Needed0 - Words of + 0 -> + Is; + Needed -> + true = Needed >= 0, %Assertion. + [{set,[],[],{alloc,Live,{F1,F2,Needed,F3}}}|Is] + end; fix_block_1([I|Is], Words) -> [I|fix_block_1(Is, Words)]. -dig_out_block_fc([{set,[],[],{alloc,Live,_}}|Bl]) -> - case dig_out_fc(Bl, Live-1, nil) of - no -> - no; - yes -> - {yes,{function_clause,Live}} - end; -dig_out_block_fc(_) -> no. -dig_out_fc([{set,[Dst],[{x,Reg},Dst0],put_list}|Is], Reg, Dst0) -> - dig_out_fc(Is, Reg-1, Dst); -dig_out_fc([{set,[{x,0}],[{atom,function_clause}],move}], -1, {x,1}) -> - yes; -dig_out_fc(_, _, _) -> no. +dig_out_fc(Arity, Is0) -> + Regs0 = maps:from_list([{{x,X},{arg,X}} || X <- seq(0, Arity-1)]), + {Is,Acc0} = splitwith(fun({label,_}) -> false; + ({test,_,_,_}) -> false; + (_) -> true + end, Is0), + {Regs,Acc} = dig_out_fc_1(reverse(Is), Regs0, Acc0), + case is_fc(Arity, Regs) of + true -> + {yes,function_clause,Acc}; + false -> + no + end. + +dig_out_fc_1([{block,Bl}|Is], Regs0, Acc) -> + Regs = dig_out_fc_block(Bl, Regs0), + dig_out_fc_1(Is, Regs, Acc); +dig_out_fc_1([{bs_set_position,_,_}=I|Is], Regs, Acc) -> + dig_out_fc_1(Is, Regs, [I|Acc]); +dig_out_fc_1([{bs_get_tail,_,_,Live}=I|Is], Regs0, Acc) -> + Regs = prune_xregs(Live, Regs0), + dig_out_fc_1(Is, Regs, [I|Acc]); +dig_out_fc_1([_|_], _Regs, _Acc) -> + {#{},[]}; +dig_out_fc_1([], Regs, Acc) -> + {Regs,Acc}. + +dig_out_fc_block([{set,[],[],{alloc,Live,_}}|Is], Regs0) -> + Regs = prune_xregs(Live, Regs0), + dig_out_fc_block(Is, Regs); +dig_out_fc_block([{set,[Dst],[Hd,Tl],put_list}|Is], Regs0) -> + Regs = Regs0#{Dst=>{cons,get_reg(Hd, Regs0),get_reg(Tl, Regs0)}}, + dig_out_fc_block(Is, Regs); +dig_out_fc_block([{set,[Dst],[Src],move}|Is], Regs0) -> + Regs = Regs0#{Dst=>get_reg(Src, Regs0)}, + dig_out_fc_block(Is, Regs); +dig_out_fc_block([{set,_,_,_}|_], _Regs) -> + %% Unknown instruction. Fail. + #{}; +dig_out_fc_block([], Regs) -> Regs. + +prune_xregs(Live, Regs) -> + maps:filter(fun({x,X}, _) -> X < Live end, Regs). + +is_fc(Arity, Regs) -> + case Regs of + #{{x,0}:={atom,function_clause},{x,1}:=Args} -> + is_fc_1(Args, 0) =:= Arity; + #{} -> + false + end. + +is_fc_1({cons,{arg,I},T}, I) -> + is_fc_1(T, I+1); +is_fc_1(nil, I) -> + I; +is_fc_1(_, _) -> -1. + +get_reg(R, Regs) -> + case Regs of + #{R:=Val} -> Val; + #{} -> R + end. |