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-rw-r--r--lib/compiler/src/beam_except.erl255
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diff --git a/lib/compiler/src/beam_except.erl b/lib/compiler/src/beam_except.erl
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index 2b9c1b0cf5..0000000000
--- a/lib/compiler/src/beam_except.erl
+++ /dev/null
@@ -1,255 +0,0 @@
-%%
-%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 2011-2018. All Rights Reserved.
-%%
-%% Licensed under the Apache License, Version 2.0 (the "License");
-%% you may not use this file except in compliance with the License.
-%% You may obtain a copy of the License at
-%%
-%% http://www.apache.org/licenses/LICENSE-2.0
-%%
-%% Unless required by applicable law or agreed to in writing, software
-%% distributed under the License is distributed on an "AS IS" BASIS,
-%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-%% See the License for the specific language governing permissions and
-%% limitations under the License.
-%%
-%% %CopyrightEnd%
-%%
-
--module(beam_except).
--export([module/2]).
-
-%%% Rewrite certain calls to erlang:error/{1,2} to specialized
-%%% instructions:
-%%%
-%%% erlang:error({badmatch,Value}) => badmatch Value
-%%% erlang:error({case_clause,Value}) => case_end Value
-%%% erlang:error({try_clause,Value}) => try_case_end Value
-%%% erlang:error(if_clause) => if_end
-%%% erlang:error(function_clause, Args) => jump FuncInfoLabel
-%%%
-
--import(lists, [reverse/1,reverse/2,seq/2,splitwith/2]).
-
--spec module(beam_utils:module_code(), [compile:option()]) ->
- {'ok',beam_utils:module_code()}.
-
-module({Mod,Exp,Attr,Fs0,Lc}, _Opt) ->
- Fs = [function(F) || F <- Fs0],
- {ok,{Mod,Exp,Attr,Fs,Lc}}.
-
-function({function,Name,Arity,CLabel,Is0}) ->
- try
- Is = function_1(Is0),
- {function,Name,Arity,CLabel,Is}
- catch
- Class:Error:Stack ->
- io:fwrite("Function: ~w/~w\n", [Name,Arity]),
- erlang:raise(Class, Error, Stack)
- end.
-
--record(st,
- {lbl :: beam_asm:label(), %func_info label
- loc :: [_], %location for func_info
- arity :: arity() %arity for function
- }).
-
-function_1(Is0) ->
- case Is0 of
- [{label,Lbl},{line,Loc},{func_info,_,_,Arity}|_] ->
- St = #st{lbl=Lbl,loc=Loc,arity=Arity},
- translate(Is0, St, []);
- [{label,_}|_] ->
- %% No line numbers. The source must be a .S file.
- %% There is no need to do anything.
- Is0
- end.
-
-translate([{call_ext,Ar,{extfunc,erlang,error,Ar}}=I|Is], St, Acc) ->
- translate_1(Ar, I, Is, St, Acc);
-translate([I|Is], St, Acc) ->
- translate(Is, St, [I|Acc]);
-translate([], _, Acc) ->
- reverse(Acc).
-
-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,Acc2} ->
- case {Is,Line,St} of
- {[return|_],{line,Loc},#st{lbl=Fi,loc=Loc}} ->
- Instr = {jump,{f,Fi}},
- translate(Is, St, [Instr|Acc2]);
- {_,_,_} ->
- %% Not a call_only instruction, or not the same
- %% location information as in in the line instruction
- %% before the func_info instruction. Not safe
- %% to translate to a jump.
- translate(Is, St, [I|Acc0])
- end;
- {yes,Instr,Acc2} ->
- translate(Is, St, [Instr,Line|Acc2])
- end.
-
-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,[]} ->
- {yes,What,Is};
- {yes,What,Bl} ->
- {yes,What,[{block,Bl}|Is]}
- end;
-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}],[{atom,Exc},Value],put_tuple2}|Is]) ->
- translate_exception(Exc, Value, Is, 3);
-dig_out_block(_) -> no.
-
-translate_exception(badmatch, Val, Is, Words) ->
- {yes,{badmatch,Val},fix_block(Is, Words)};
-translate_exception(case_clause, Val, Is, Words) ->
- {yes,{case_end,Val},fix_block(Is, Words)};
-translate_exception(try_clause, Val, Is, Words) ->
- {yes,{try_case_end,Val},fix_block(Is, Words)};
-translate_exception(_, _, _, _) -> no.
-
-fix_block(Is, 0) ->
- reverse(Is);
-fix_block(Is, Words) ->
- reverse(fix_block_1(Is, Words)).
-
-fix_block_1([{set,[],[],{alloc,Live,{F1,F2,Needed0,F3}}}|Is], Words) ->
- 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)];
-fix_block_1([], _Words) ->
- %% Rare. The heap allocation was probably done by a binary
- %% construction instruction.
- [].
-
-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), Arity, Regs0, Acc0),
- case Regs of
- #{{x,0}:={atom,function_clause},{x,1}:=Args} ->
- case moves_from_stack(Args, 0, []) of
- {Moves,Arity} ->
- {yes,function_clause,reverse(Moves, Acc)};
- {_,_} ->
- no
- end;
- #{} ->
- no
- end.
-
-dig_out_fc_1([{block,Bl}|Is], Arity, Regs0, Acc) ->
- Regs = dig_out_fc_block(Bl, Regs0),
- dig_out_fc_1(Is, Arity, Regs, Acc);
-dig_out_fc_1([{bs_set_position,_,_}=I|Is], Arity, Regs, Acc) ->
- dig_out_fc_1(Is, Arity, Regs, [I|Acc]);
-dig_out_fc_1([{bs_get_tail,Src,Dst,Live0}|Is], Arity, Regs0, Acc) ->
- case Src of
- {x,X} when X < Arity ->
- %% The heuristic for determining the number of live
- %% registers is likely to give an incorrect result.
- %% Give up.
- {#{},[]};
- _ ->
- Regs = prune_xregs(Live0, Regs0),
- Live = dig_out_stack_live(Regs, Live0),
- I = {bs_get_tail,Src,Dst,Live},
- dig_out_fc_1(Is, Arity, Regs, [I|Acc])
- end;
-dig_out_fc_1([_|_], _Arity, _Regs, _Acc) ->
- {#{},[]};
-dig_out_fc_1([], _Arity, 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.
-
-dig_out_stack_live(Regs, Default) ->
- Reg = {x,2},
- case Regs of
- #{Reg:=List} ->
- dig_out_stack_live_1(List, Default);
- #{} ->
- Default
- end.
-
-dig_out_stack_live_1({cons,{arg,N},T}, Live) ->
- dig_out_stack_live_1(T, max(N + 1, Live));
-dig_out_stack_live_1({cons,_,T}, Live) ->
- dig_out_stack_live_1(T, Live);
-dig_out_stack_live_1(nil, Live) ->
- Live;
-dig_out_stack_live_1(_, Live) -> Live.
-
-prune_xregs(Live, Regs) ->
- maps:filter(fun({x,X}, _) -> X < Live end, Regs).
-
-moves_from_stack({cons,{arg,N},_}, I, _Acc) when N =/= I ->
- %% Wrong argument. Give up.
- {[],-1};
-moves_from_stack({cons,H,T}, I, Acc) ->
- case H of
- {arg,I} ->
- moves_from_stack(T, I+1, Acc);
- _ ->
- moves_from_stack(T, I+1, [{move,H,{x,I}}|Acc])
- end;
-moves_from_stack(nil, I, Acc) ->
- {reverse(Acc),I};
-moves_from_stack({literal,[H|T]}, I, Acc) ->
- Cons = {cons,tag_literal(H),tag_literal(T)},
- moves_from_stack(Cons, I, Acc);
-moves_from_stack(_, _, _) ->
- %% Not understood. Give up.
- {[],-1}.
-
-
-get_reg(R, Regs) ->
- case Regs of
- #{R:=Val} -> Val;
- #{} -> R
- end.
-
-tag_literal([]) -> nil;
-tag_literal(T) when is_atom(T) -> {atom,T};
-tag_literal(T) when is_float(T) -> {float,T};
-tag_literal(T) when is_integer(T) -> {integer,T};
-tag_literal(T) -> {literal,T}.
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-19 15:54:08 +0000