From 05d9c45e7295243f897f3e423ee4540d4c6d9bc5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Thu, 16 Aug 2018 11:50:40 +0200 Subject: Remove retired compiler passes --- lib/compiler/src/Makefile | 1 - lib/compiler/src/beam_receive.erl | 416 ------ lib/compiler/src/beam_record.erl | 131 -- lib/compiler/src/beam_reorder.erl | 150 -- lib/compiler/src/beam_type.erl | 1117 -------------- lib/compiler/src/v3_codegen.erl | 2925 ------------------------------------- 6 files changed, 4740 deletions(-) delete mode 100644 lib/compiler/src/beam_receive.erl delete mode 100644 lib/compiler/src/beam_record.erl delete mode 100644 lib/compiler/src/beam_reorder.erl delete mode 100644 lib/compiler/src/beam_type.erl delete mode 100644 lib/compiler/src/v3_codegen.erl (limited to 'lib') diff --git a/lib/compiler/src/Makefile b/lib/compiler/src/Makefile index f036a2d8dc..bd35f20442 100644 --- a/lib/compiler/src/Makefile +++ b/lib/compiler/src/Makefile @@ -211,7 +211,6 @@ $(EBIN)/sys_core_dsetel.beam: core_parse.hrl $(EBIN)/sys_core_fold.beam: core_parse.hrl $(EBIN)/sys_core_fold_lists.beam: core_parse.hrl $(EBIN)/sys_core_inline.beam: core_parse.hrl -$(EBIN)/v3_codegen.beam: v3_kernel.hrl $(EBIN)/v3_core.beam: core_parse.hrl $(EBIN)/v3_kernel.beam: core_parse.hrl v3_kernel.hrl $(EBIN)/v3_kernel_pp.beam: v3_kernel.hrl diff --git a/lib/compiler/src/beam_receive.erl b/lib/compiler/src/beam_receive.erl deleted file mode 100644 index ddbe67605a..0000000000 --- a/lib/compiler/src/beam_receive.erl +++ /dev/null @@ -1,416 +0,0 @@ -%% -%% %CopyrightBegin% -%% -%% Copyright Ericsson AB 2010-2018. 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_receive). --export([module/2]). --import(lists, [foldl/3,reverse/1,reverse/2]). - -%%% -%%% In code such as: -%%% -%%% Ref = make_ref(), %Or erlang:monitor(process, Pid) -%%% . -%%% . -%%% . -%%% receive -%%% {Ref,Reply} -> Reply -%%% end. -%%% -%%% we know that none of the messages that exist in the message queue -%%% before the call to make_ref/0 can be matched out in the receive -%%% statement. Therefore we can avoid going through the entire message -%%% queue if we introduce two new instructions (here written as -%%% BIFs in pseudo-Erlang): -%%% -%%% recv_mark(SomeUniqInteger), -%%% Ref = make_ref(), -%%% . -%%% . -%%% . -%%% recv_set(SomeUniqInteger), -%%% receive -%%% {Ref,Reply} -> Reply -%%% end. -%%% -%%% The recv_mark/1 instruction will save the current position and -%%% SomeUniqInteger in the process context. The recv_set -%%% instruction will verify that SomeUniqInteger is still stored -%%% in the process context. If it is, it will set the current pointer -%%% for the message queue (the next message to be read out) to the -%%% position that was saved by recv_mark/1. -%%% -%%% The remove_message instruction must be modified to invalidate -%%% the information stored by the previous recv_mark/1, in case there -%%% is another receive executed between the calls to recv_mark/1 and -%%% recv_set/1. -%%% -%%% We use a reference to a label (i.e. a position in the loaded code) -%%% as the SomeUniqInteger. -%%% - --spec module(beam_utils:module_code(), [compile:option()]) -> - {'ok',beam_utils:module_code()}. - -module({Mod,Exp,Attr,Fs0,Lc}, _Opts) -> - Fs = [function(F) || F <- Fs0], - Code = {Mod,Exp,Attr,Fs,Lc}, - {ok,Code}. - -%%% -%%% Local functions. -%%% - -function({function,Name,Arity,Entry,Is}) -> - try - D = beam_utils:index_labels(Is), - {function,Name,Arity,Entry,opt(Is, D, [])} - catch - Class:Error:Stack -> - io:fwrite("Function: ~w/~w\n", [Name,Arity]), - erlang:raise(Class, Error, Stack) - end. - -opt([{call_ext,A,{extfunc,erlang,spawn_monitor,A}}=I0|Is0], D, Acc) - when A =:= 1; A =:= 3 -> - case ref_in_tuple(Is0) of - no -> - opt(Is0, D, [I0|Acc]); - {yes,Regs,Is1,MatchReversed} -> - %% The call creates a brand new reference. Now - %% search for a receive statement in the same - %% function that will match against the reference. - case opt_recv(Is1, Regs, D) of - no -> - opt(Is0, D, [I0|Acc]); - {yes,Is,Lbl} -> - opt(Is, D, MatchReversed++[I0,{recv_mark,{f,Lbl}}|Acc]) - end - end; -opt([{call_ext,Arity,{extfunc,erlang,Name,Arity}}=I|Is0], D, Acc) -> - case creates_new_ref(Name, Arity) of - true -> - %% The call creates a brand new reference. Now - %% search for a receive statement in the same - %% function that will match against the reference. - case opt_recv(Is0, regs_init_x0(), D) of - no -> - opt(Is0, D, [I|Acc]); - {yes,Is,Lbl} -> - opt(Is, D, [I,{recv_mark,{f,Lbl}}|Acc]) - end; - false -> - opt(Is0, D, [I|Acc]) - end; -opt([I|Is], D, Acc) -> - opt(Is, D, [I|Acc]); -opt([], _, Acc) -> - reverse(Acc). - -ref_in_tuple([{test,is_tuple,_,[{x,0}]}=I1, - {test,test_arity,_,[{x,0},2]}=I2, - {block,[{set,[_],[{x,0}],{get_tuple_element,0}}, - {set,[Dst],[{x,0}],{get_tuple_element,1}}|Bl]}=I3|Is]) -> - ref_in_tuple_1(Bl, Dst, Is, [I3,I2,I1]); -ref_in_tuple([{test,is_tuple,_,[{x,0}]}=I1, - {test,test_arity,_,[{x,0},2]}=I2, - {block,[{set,[Dst],[{x,0}],{get_tuple_element,1}}|Bl]}=I3|Is]) -> - ref_in_tuple_1(Bl, Dst, Is, [I3,I2,I1]); -ref_in_tuple(_) -> no. - -ref_in_tuple_1(Bl, Dst, Is, MatchReversed) -> - Regs0 = regs_init_singleton(Dst), - Regs = opt_update_regs_bl(Bl, Regs0), - {yes,Regs,Is,MatchReversed}. - -%% creates_new_ref(Name, Arity) -> true|false. -%% Return 'true' if the BIF Name/Arity will create a new reference. -creates_new_ref(monitor, 2) -> true; -creates_new_ref(make_ref, 0) -> true; -creates_new_ref(_, _) -> false. - -%% opt_recv([Instruction], Regs, LabelIndex) -> no|{yes,[Instruction]} -%% Search for a receive statement that will only retrieve messages -%% that contain the newly created reference (which is currently in {x,0}). -opt_recv(Is, Regs, D) -> - L = gb_sets:empty(), - opt_recv(Is, D, Regs, L, []). - -opt_recv([{label,L}=Lbl,{loop_rec,{f,Fail},_}=Loop|Is], D, R0, _, Acc) -> - R = regs_kill_not_live(0, R0), - case regs_empty(R) of - false -> - %% We now have the new reference in Y registers - %% and the current instruction is the beginning of a - %% receive statement. We must now verify that only messages - %% that contain the reference will be matched. - case opt_ref_used(Is, R, Fail, D) of - false -> - no; - true -> - RecvSet = {recv_set,{f,L}}, - {yes,reverse(Acc, [RecvSet,Lbl,Loop|Is]),L} - end; - true -> - no - end; -opt_recv([I|Is], D, R0, L0, Acc) -> - {R,L} = opt_update_regs(I, R0, L0), - case regs_empty(R) of - true -> - %% The reference is no longer alive. There is no - %% point in continuing the search. - no; - false -> - opt_recv(Is, D, R, L, [I|Acc]) - end; -opt_recv([], _, _, _, _) -> no. - -opt_update_regs({block,Bl}, R, L) -> - {opt_update_regs_bl(Bl, R),L}; -opt_update_regs({call,_,_}, R, L) -> - {regs_kill_not_live(0, R),L}; -opt_update_regs({call_ext,_,_}, R, L) -> - {regs_kill_not_live(0, R),L}; -opt_update_regs({call_fun,_}, R, L) -> - {regs_kill_not_live(0, R),L}; -opt_update_regs({kill,Y}, R, L) -> - {regs_kill([Y], R),L}; -opt_update_regs({'catch',_,{f,Lbl}}, R, L) -> - {R,gb_sets:add(Lbl, L)}; -opt_update_regs({catch_end,_}, R, L) -> - {R,L}; -opt_update_regs({label,Lbl}, R, L) -> - case gb_sets:is_member(Lbl, L) of - false -> - %% We can't allow arbitrary labels (since the receive - %% could be entered without first creating the reference). - {regs_init(),L}; - true -> - %% A catch label for a previously seen catch instruction is OK. - {R,L} - end; -opt_update_regs({'try',_,{f,Lbl}}, R, L) -> - {R,gb_sets:add(Lbl, L)}; -opt_update_regs({try_end,_}, R, L) -> - {R,L}; -opt_update_regs({line,_}, R, L) -> - {R,L}; -opt_update_regs(_I, _R, L) -> - %% Unrecognized instruction. Abort the search. - {regs_init(),L}. - -opt_update_regs_bl([{set,Ds,_,{alloc,Live,_}}|Is], Regs0) -> - Regs1 = regs_kill_not_live(Live, Regs0), - Regs = regs_kill(Ds, Regs1), - opt_update_regs_bl(Is, Regs); -opt_update_regs_bl([{set,[Dst]=Ds,[Src],move}|Is], Regs0) -> - Regs1 = regs_kill(Ds, Regs0), - Regs = case regs_is_member(Src, Regs1) of - false -> Regs1; - true -> regs_add(Dst, Regs1) - end, - opt_update_regs_bl(Is, Regs); -opt_update_regs_bl([{set,Ds,_,_}|Is], Regs0) -> - Regs = regs_kill(Ds, Regs0), - opt_update_regs_bl(Is, Regs); -opt_update_regs_bl([], Regs) -> Regs. - -%% opt_ref_used([Instruction], RefRegs, FailLabel, LabelIndex) -> true|false -%% Return 'true' if it is certain that only messages that contain the same -%% reference as in RefRegs can be matched out. Otherwise return 'false'. -%% -%% Basically, we follow all possible paths through the receive statement. -%% If all paths are safe, we return 'true'. -%% -%% A branch to FailLabel is safe, because it exits the receive statement -%% and no further message may be matched out. -%% -%% If a path hits an comparision between RefRegs and part of the message, -%% that path is safe (any messages that may be matched further down the -%% path is guaranteed to contain the reference). -%% -%% Otherwise, if we hit a 'remove_message' instruction, we give up -%% and return 'false' (the optimization is definitely unsafe). If -%% we hit an unrecognized instruction, we also give up and return -%% 'false' (the optimization may be unsafe). - -opt_ref_used(Is, RefRegs, Fail, D) -> - Done = gb_sets:singleton(Fail), - Regs = regs_init_x0(), - try - _ = opt_ref_used_1(Is, RefRegs, D, Done, Regs), - true - catch - throw:not_used -> - false - end. - -%% This functions only returns if all paths through the receive -%% statement are safe, and throws an 'not_used' term otherwise. -opt_ref_used_1([{block,Bl}|Is], RefRegs, D, Done, Regs0) -> - Regs = opt_ref_used_bl(Bl, Regs0), - opt_ref_used_1(Is, RefRegs, D, Done, Regs); -opt_ref_used_1([{test,is_eq_exact,{f,Fail},Args}|Is], - RefRegs, D, Done0, Regs) -> - Done = opt_ref_used_at(Fail, RefRegs, D, Done0, Regs), - case is_ref_msg_comparison(Args, RefRegs, Regs) of - false -> - opt_ref_used_1(Is, RefRegs, D, Done, Regs); - true -> - %% The instructions that follow (Is) can only be executed - %% if the message contains the same reference as in RefRegs. - Done - end; -opt_ref_used_1([{test,is_ne_exact,{f,Fail},Args}|Is], - RefRegs, D, Done0, Regs) -> - Done = opt_ref_used_1(Is, RefRegs, D, Done0, Regs), - case is_ref_msg_comparison(Args, RefRegs, Regs) of - false -> - opt_ref_used_at(Fail, RefRegs, D, Done, Regs); - true -> - Done - end; -opt_ref_used_1([{test,_,{f,Fail},_}|Is], RefRegs, D, Done0, Regs) -> - Done = opt_ref_used_at(Fail, RefRegs, D, Done0, Regs), - opt_ref_used_1(Is, RefRegs, D, Done, Regs); -opt_ref_used_1([{select,_,_,{f,Fail},List}|_], RefRegs, D, Done, Regs) -> - Lbls = [F || {f,F} <- List] ++ [Fail], - opt_ref_used_in_all(Lbls, RefRegs, D, Done, Regs); -opt_ref_used_1([{label,Lbl}|Is], RefRegs, D, Done, Regs) -> - case gb_sets:is_member(Lbl, Done) of - true -> Done; - false -> opt_ref_used_1(Is, RefRegs, D, Done, Regs) - end; -opt_ref_used_1([{loop_rec_end,_}|_], _, _, Done, _) -> - Done; -opt_ref_used_1([_I|_], _RefReg, _D, _Done, _Regs) -> - %% The optimization may be unsafe. - throw(not_used). - -%% is_ref_msg_comparison(Args, RefRegs, RegisterSet) -> true|false. -%% Return 'true' if Args denotes a comparison between the -%% reference and message or part of the message. -is_ref_msg_comparison([R1,R2], RefRegs, Regs) -> - (regs_is_member(R2, RefRegs) andalso regs_is_member(R1, Regs)) orelse - (regs_is_member(R1, RefRegs) andalso regs_is_member(R2, Regs)). - -opt_ref_used_in_all([L|Ls], RefRegs, D, Done0, Regs) -> - Done = opt_ref_used_at(L, RefRegs, D, Done0, Regs), - opt_ref_used_in_all(Ls, RefRegs, D, Done, Regs); -opt_ref_used_in_all([], _, _, Done, _) -> Done. - -opt_ref_used_at(Fail, RefRegs, D, Done0, Regs) -> - case gb_sets:is_member(Fail, Done0) of - true -> - Done0; - false -> - Is = beam_utils:code_at(Fail, D), - Done = opt_ref_used_1(Is, RefRegs, D, Done0, Regs), - gb_sets:add(Fail, Done) - end. - -opt_ref_used_bl([{set,[],[],remove_message}|_], _) -> - %% We have proved that a message that does not depend on the - %% reference can be matched out. - throw(not_used); -opt_ref_used_bl([{set,Ds,Ss,_}|Is], Regs0) -> - case regs_all_members(Ss, Regs0) of - false -> - %% The destination registers may be assigned values that - %% are not dependent on the message being matched. - Regs = regs_kill(Ds, Regs0), - opt_ref_used_bl(Is, Regs); - true -> - %% All the sources depend on the message directly or - %% indirectly. - Regs = regs_add_list(Ds, Regs0), - opt_ref_used_bl(Is, Regs) - end; -opt_ref_used_bl([], Regs) -> Regs. - -%%% -%%% Functions for keeping track of a set of registers. -%%% - -%% regs_init() -> RegisterSet -%% Return an empty set of registers. - -regs_init() -> - {0,0}. - -%% regs_init_singleton(Register) -> RegisterSet -%% Return a set that only contains one register. - -regs_init_singleton(Reg) -> - regs_add(Reg, regs_init()). - -%% regs_init_x0() -> RegisterSet -%% Return a set that only contains the {x,0} register. - -regs_init_x0() -> - {1 bsl 0,0}. - -%% regs_empty(Register) -> true|false -%% Test whether the register set is empty. - -regs_empty(R) -> - R =:= {0,0}. - -%% regs_kill_not_live(Live, RegisterSet) -> RegisterSet' -%% Kill all registers indicated not live by Live. - -regs_kill_not_live(Live, {Xregs,Yregs}) -> - {Xregs band ((1 bsl Live)-1),Yregs}. - -%% regs_kill([Register], RegisterSet) -> RegisterSet' -%% Kill all registers mentioned in the list of registers. - -regs_kill([{x,N}|Rs], {Xregs,Yregs}) -> - regs_kill(Rs, {Xregs band (bnot (1 bsl N)),Yregs}); -regs_kill([{y,N}|Rs], {Xregs,Yregs}) -> - regs_kill(Rs, {Xregs,Yregs band (bnot (1 bsl N))}); -regs_kill([{fr,_}|Rs], Regs) -> - regs_kill(Rs, Regs); -regs_kill([], Regs) -> Regs. - -regs_add_list(List, Regs) -> - foldl(fun(R, A) -> regs_add(R, A) end, Regs, List). - -%% regs_add(Register, RegisterSet) -> RegisterSet' -%% Add a new register to the set of registers. - -regs_add({x,N}, {Xregs,Yregs}) -> - {Xregs bor (1 bsl N),Yregs}; -regs_add({y,N}, {Xregs,Yregs}) -> - {Xregs,Yregs bor (1 bsl N)}. - -%% regs_all_members([Register], RegisterSet) -> true|false -%% Test whether all of the registers are part of the register set. - -regs_all_members([R|Rs], Regs) -> - regs_is_member(R, Regs) andalso regs_all_members(Rs, Regs); -regs_all_members([], _) -> true. - -%% regs_is_member(Register, RegisterSet) -> true|false -%% Test whether Register is part of the register set. - -regs_is_member({x,N}, {Regs,_}) -> Regs band (1 bsl N) =/= 0; -regs_is_member({y,N}, {_,Regs}) -> Regs band (1 bsl N) =/= 0; -regs_is_member(_, _) -> false. diff --git a/lib/compiler/src/beam_record.erl b/lib/compiler/src/beam_record.erl deleted file mode 100644 index 58a6de6775..0000000000 --- a/lib/compiler/src/beam_record.erl +++ /dev/null @@ -1,131 +0,0 @@ -%% %CopyrightBegin% -%% -%% Copyright Ericsson AB 2014-2017. All Rights Reserved. -%% -%% The contents of this file are subject to the Erlang Public License, -%% Version 1.1, (the "License"); you may not use this file except in -%% compliance with the License. You should have received a copy of the -%% Erlang Public License along with this software. If not, it can be -%% retrieved online at http://www.erlang.org/. -%% -%% Software distributed under the License is distributed on an "AS IS" -%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See -%% the License for the specific language governing rights and limitations -%% under the License. -%% -%% %CopyrightEnd% -%% - -%% Rewrite the instruction stream on tagged tuple tests. -%% Tagged tuples means a tuple of any arity with an atom as its -%% first element, such as records and error tuples. -%% -%% From: -%% ... -%% {test,is_tuple,Fail,[Src]}. -%% {test,test_arity,Fail,[Src,Sz]}. -%% ... -%% {get_tuple_element,Src,0,Dst}. -%% ... -%% {test,is_eq_exact,Fail,[Dst,Atom]}. -%% ... -%% To: -%% ... -%% {test,is_tagged_tuple,Fail,[Src,Sz,Atom]}. -%% ... -%% - --module(beam_record). --export([module/2]). - --import(lists, [reverse/1,reverse/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 - Is1 = beam_utils:anno_defs(Is0), - Idx = beam_utils:index_labels(Is1), - Is = rewrite(reverse(Is1), Idx), - {function,Name,Arity,CLabel,Is} - catch - Class:Error:Stack -> - io:fwrite("Function: ~w/~w\n", [Name,Arity]), - erlang:raise(Class, Error, Stack) - end. - -rewrite(Is, Idx) -> - rewrite(Is, Idx, 0, []). - -rewrite([{test,test_arity,Fail,[Src,N]}=TA, - {test,is_tuple,Fail,[Src]}=TT|Is], Idx, Def, Acc0) -> - case is_tagged_tuple(Acc0, Def, Fail, Src, Idx) of - no -> - rewrite(Is, Idx, 0, [TT,TA|Acc0]); - {yes,Atom,Acc} -> - I = {test,is_tagged_tuple,Fail,[Src,N,Atom]}, - rewrite(Is, Idx, Def, [I|Acc]) - end; -rewrite([{block,[{'%anno',{def,Def}}|Bl]}|Is], Idx, _Def, Acc) -> - rewrite(Is, Idx, Def, [{block,Bl}|Acc]); -rewrite([{label,L}=I|Is], Idx0, Def, Acc) -> - Idx = beam_utils:index_label(L, Acc, Idx0), - rewrite(Is, Idx, Def, [I|Acc]); -rewrite([I|Is], Idx, Def, Acc) -> - rewrite(Is, Idx, Def, [I|Acc]); -rewrite([], _, _, Acc) -> Acc. - -is_tagged_tuple([{block,Bl}, - {test,is_eq_exact,Fail,[Dst,{atom,_}=Atom]}|Is], - Def, Fail, Src, Idx) -> - case is_tagged_tuple_1(Bl, Is, Fail, Src, Dst, Idx, Def, []) of - no -> - no; - {yes,[]} -> - {yes,Atom,Is}; - {yes,[_|_]=Block} -> - {yes,Atom,[{block,Block}|Is]} - end; -is_tagged_tuple(_, _, _, _, _) -> - no. - -is_tagged_tuple_1([{set,[Dst],[Src],{get_tuple_element,0}}=I|Bl], - Is, Fail, Src, Dst, Idx, Def, Acc) -> - %% Check usage of Dst to find out whether the get_tuple_element - %% is needed. - case usage(Dst, Is, Fail, Idx) of - killed -> - %% Safe to remove the get_tuple_element instruction. - {yes,reverse(Acc, Bl)}; - used -> - %% Actively used. Must keep instruction. - {yes,reverse(Acc, [I|Bl])}; - not_used -> - %% Not actually used (but must be initialized). - case is_defined(Dst, Def) of - false -> - %% Dst must be initialized, but the - %% actual value does not matter. - Kill = {set,[Dst],[nil],move}, - {yes,reverse(Acc, [Kill|Bl])}; - true -> - %% The register is previously initialized. - %% We can remove the instruction. - {yes,reverse(Acc, Bl)} - end - end; -is_tagged_tuple_1([I|Bl], Is, Fail, Src, Dst, Idx, Def, Acc) -> - is_tagged_tuple_1(Bl, Is, Fail, Src, Dst, Idx, Def, [I|Acc]); -is_tagged_tuple_1(_, _, _, _, _, _, _, _) -> - no. - -usage(Dst, Is, Fail, Idx) -> - beam_utils:usage(Dst, [{test,is_number,Fail,[nil]}|Is], Idx). - -is_defined({x,X}, Def) -> - (Def bsr X) band 1 =:= 1. diff --git a/lib/compiler/src/beam_reorder.erl b/lib/compiler/src/beam_reorder.erl deleted file mode 100644 index 8d2ef5a431..0000000000 --- a/lib/compiler/src/beam_reorder.erl +++ /dev/null @@ -1,150 +0,0 @@ -%% -%% %CopyrightBegin% -%% -%% Copyright Ericsson AB 1999-2018. 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_reorder). - --export([module/2]). --import(lists, [member/2,reverse/1]). - --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 = reorder(Is0), - {function,Name,Arity,CLabel,Is} - catch - Class:Error:Stack -> - io:fwrite("Function: ~w/~w\n", [Name,Arity]), - erlang:raise(Class, Error, Stack) - end. - -%% reorder(Instructions0) -> Instructions -%% Reorder instructions before the beam_block pass, because reordering -%% will be more cumbersome when the blocks are in place. -%% -%% Execution of get_tuple_element instructions can be delayed until -%% they are actually needed. Consider the sequence: -%% -%% get_tuple_element Tuple Pos Dst -%% test Test Fail Operands -%% -%% If Dst is killed at label Fail (and not referenced in Operands), -%% we can can swap the instructions: -%% -%% test Test Fail Operands -%% get_tuple_element Tuple Pos Dst -%% -%% That can be beneficial in two ways: Firstly, if the branch is taken -%% we have avoided execution of the get_tuple_element instruction. -%% Secondly, even if the branch is not taken, subsequent optimization -%% (opt_blocks/1) may be able to change Dst to the final destination -%% register and eliminate a 'move' instruction. - -reorder(Is) -> - D = beam_utils:index_labels(Is), - reorder_1(Is, D, []). - -reorder_1([{Op,_,_}=TryCatch|[I|Is]=Is0], D, Acc) - when Op =:= 'catch'; Op =:= 'try' -> - %% Don't allow 'try' or 'catch' instructions to split blocks if - %% it can be avoided. - case is_safe(I) of - false -> - reorder_1(Is0, D, [TryCatch|Acc]); - true -> - reorder_1([TryCatch|Is], D, [I|Acc]) - end; -reorder_1([{label,L}=I|_], D, Acc) -> - Is = beam_utils:code_at(L, D), - reorder_1(Is, D, [I|Acc]); -reorder_1([{test,is_nonempty_list,_,_}=I|Is], D, Acc) -> - %% The run-time system may combine the is_nonempty_list test with - %% the following get_list instruction. - reorder_1(Is, D, [I|Acc]); -reorder_1([{test,_,_,_}=I, - {select,_,_,_,_}=S|Is], D, Acc) -> - %% There is nothing to gain by inserting a get_tuple_element - %% instruction between the test instruction and the select - %% instruction. - reorder_1(Is, D, [S,I|Acc]); -reorder_1([{test,_,{f,_},[Src|_]}=I|Is], D, - [{get_tuple_element,Src,_,_}|_]=Acc) -> - %% We want to avoid code that can confuse beam_validator such as: - %% is_tuple Fail Src - %% test_arity Fail Src Arity - %% is_map Fail Src - %% get_tuple_element Src Pos Dst - %% Therefore, don't reorder the instructions in such cases. - reorder_1(Is, D, [I|Acc]); -reorder_1([{test,_,{f,L},Ss}=I|Is0], D0, - [{get_tuple_element,_,_,El}=G|Acc0]=Acc) -> - case member(El, Ss) of - true -> - reorder_1(Is0, D0, [I|Acc]); - false -> - case beam_utils:is_killed_at(El, L, D0) of - true -> - Is = [I,G|Is0], - reorder_1(Is, D0, Acc0); - false -> - case beam_utils:is_killed(El, Is0, D0) of - true -> - Code0 = beam_utils:code_at(L, D0), - Code = [G|Code0], - D = beam_utils:index_label(L, Code, D0), - Is = [I|Is0], - reorder_1(Is, D, Acc0); - false -> - reorder_1(Is0, D0, [I|Acc]) - end - end - end; -reorder_1([{allocate_zero,N,Live}=I0|Is], D, - [{get_tuple_element,{x,Tup},_,{x,Dst}}=G|Acc]=Acc0) -> - case Tup < Dst andalso Dst+1 =:= Live of - true -> - %% Move allocation instruction upwards past - %% get_tuple_element instructions to create more - %% opportunities for moving get_tuple_element - %% instructions. - I = {allocate_zero,N,Dst}, - reorder_1([I,G|Is], D, Acc); - false -> - reorder_1(Is, D, [I0|Acc0]) - end; -reorder_1([I|Is], D, Acc) -> - reorder_1(Is, D, [I|Acc]); -reorder_1([], _, Acc) -> reverse(Acc). - -%% is_safe(Instruction) -> true|false -%% Test whether an instruction is safe (cannot cause an exception). - -is_safe({kill,_}) -> true; -is_safe({move,_,_}) -> true; -is_safe({put,_}) -> true; -is_safe({put_list,_,_,_}) -> true; -is_safe({put_tuple,_,_}) -> true; -is_safe({test_heap,_,_}) -> true; -is_safe(_) -> false. diff --git a/lib/compiler/src/beam_type.erl b/lib/compiler/src/beam_type.erl deleted file mode 100644 index b5c979e529..0000000000 --- a/lib/compiler/src/beam_type.erl +++ /dev/null @@ -1,1117 +0,0 @@ -%% -%% %CopyrightBegin% -%% -%% Copyright Ericsson AB 1999-2018. 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% -%% -%% Purpose: Type-based optimisations. See the comment for verified_type/1 -%% the very end of this file for a description of the types in the -%% type database. - --module(beam_type). - --export([module/2]). - --import(lists, [foldl/3,member/2,reverse/1,reverse/2,sort/1]). - --define(UNICODE_INT, {integer,{0,16#10FFFF}}). - --spec module(beam_utils:module_code(), [compile:option()]) -> - {'ok',beam_utils:module_code()}. - -module({Mod,Exp,Attr,Fs0,Lc}, _Opts) -> - Fs = [function(F) || F <- Fs0], - {ok,{Mod,Exp,Attr,Fs,Lc}}. - -function({function,Name,Arity,CLabel,Asm0}) -> - try - Asm1 = beam_utils:live_opt(Asm0), - Asm2 = opt(Asm1, [], tdb_new()), - Asm3 = beam_utils:live_opt(Asm2), - Asm = beam_utils:delete_annos(Asm3), - {function,Name,Arity,CLabel,Asm} - catch - Class:Error:Stack -> - io:fwrite("Function: ~w/~w\n", [Name,Arity]), - erlang:raise(Class, Error, Stack) - end. - -%% opt([Instruction], Accumulator, TypeDb) -> {[Instruction'],TypeDb'} -%% Keep track of type information; try to simplify. - -opt([{block,Body1}|Is], [{block,Body0}|Acc], Ts0) -> - {Body2,Ts} = simplify(Body1, Ts0), - Body = merge_blocks(Body0, Body2), - opt(Is, [{block,Body}|Acc], Ts); -opt([{block,Body0}|Is], Acc, Ts0) -> - {Body,Ts} = simplify(Body0, Ts0), - opt(Is, [{block,Body}|Acc], Ts); -opt([I0|Is], Acc, Ts0) -> - case simplify_basic([I0], Ts0) of - {[],Ts} -> opt(Is, Acc, Ts); - {[I],Ts} -> opt(Is, [I|Acc], Ts) - end; -opt([], Acc, _) -> reverse(Acc). - -%% simplify(Instruction, TypeDb) -> NewInstruction -%% Simplify an instruction using type information (this is -%% technically a "strength reduction"). - -simplify(Is0, TypeDb0) -> - {Is,_} = BasicRes = simplify_basic(Is0, TypeDb0), - case simplify_float(Is, TypeDb0) of - not_possible -> BasicRes; - {_,_}=Res -> Res - end. - -%% simplify_basic([Instruction], TypeDatabase) -> {[Instruction],TypeDatabase'} -%% Basic simplification, mostly tuples, no floating point optimizations. - -simplify_basic(Is, Ts) -> - simplify_basic(Is, Ts, []). - -simplify_basic([I0|Is], Ts0, Acc) -> - case simplify_instr(I0, Ts0) of - [] -> - simplify_basic(Is, Ts0, Acc); - [I] -> - Ts = update(I, Ts0), - simplify_basic(Is, Ts, [I|Acc]) - end; -simplify_basic([], Ts, Acc) -> - {reverse(Acc),Ts}. - -%% simplify_instr(Instruction, Ts) -> [Instruction]. - -%% Simplify a simple instruction using type information. Return an -%% empty list if the instruction should be removed, or a list with -%% the original or modified instruction. - -simplify_instr({set,[D],[{integer,Index},Reg],{bif,element,_}}=I, Ts) -> - case max_tuple_size(Reg, Ts) of - Sz when 0 < Index, Index =< Sz -> - [{set,[D],[Reg],{get_tuple_element,Index-1}}]; - _ -> [I] - end; -simplify_instr({test,Test,Fail,[R]}=I, Ts) -> - case tdb_find(R, Ts) of - any -> - [I]; - Type -> - case will_succeed(Test, Type) of - yes -> []; - no -> [{jump,Fail}]; - maybe -> [I] - end - end; -simplify_instr({set,[D],[TupleReg],{get_tuple_element,0}}=I, Ts) -> - case tdb_find(TupleReg, Ts) of - {tuple,_,_,[Contents]} -> - [{set,[D],[Contents],move}]; - _ -> - [I] - end; -simplify_instr({test,test_arity,_,[R,Arity]}=I, Ts) -> - case tdb_find(R, Ts) of - {tuple,exact_size,Arity,_} -> []; - _ -> [I] - end; -simplify_instr({test,is_eq_exact,Fail,[R,{atom,A}=Atom]}=I, Ts) -> - case tdb_find(R, Ts) of - {atom,_}=Atom -> []; - boolean when is_boolean(A) -> [I]; - any -> [I]; - _ -> [{jump,Fail}] - end; -simplify_instr({test,is_record,_,[R,{atom,_}=Tag,{integer,Arity}]}=I, Ts) -> - case tdb_find(R, Ts) of - {tuple,exact_size,Arity,[Tag]} -> []; - _ -> [I] - end; -simplify_instr({select,select_val,Reg,_,_}=I, Ts) -> - [case tdb_find(Reg, Ts) of - {integer,Range} -> - simplify_select_val_int(I, Range); - boolean -> - simplify_select_val_bool(I); - _ -> - I - end]; -simplify_instr({test,bs_test_unit,_,[Src,Unit]}=I, Ts) -> - case tdb_find(Src, Ts) of - {binary,U} when U rem Unit =:= 0 -> []; - _ -> [I] - end; -simplify_instr(I, _) -> [I]. - -simplify_select_val_int({select,select_val,R,_,L0}=I, {Min,Max}) -> - Vs = sort([V || {integer,V} <- L0]), - case eq_ranges(Vs, Min, Max) of - false -> I; - true -> simplify_select_val_1(L0, {integer,Max}, R, []) - end. - -simplify_select_val_bool({select,select_val,R,_,L}=I) -> - Vs = sort([V || {atom,V} <- L]), - case Vs of - [false,true] -> - simplify_select_val_1(L, {atom,false}, R, []); - _ -> - I - end. - -simplify_select_val_1([Val,F|T], Val, R, Acc) -> - L = reverse(Acc, T), - {select,select_val,R,F,L}; -simplify_select_val_1([V,F|T], Val, R, Acc) -> - simplify_select_val_1(T, Val, R, [F,V|Acc]). - -eq_ranges([H], H, H) -> true; -eq_ranges([H|T], H, Max) -> eq_ranges(T, H+1, Max); -eq_ranges(_, _, _) -> false. - -%% will_succeed(TestOperation, Type) -> yes|no|maybe. -%% Test whether TestOperation applied to an argument of type Type -%% will succeed. Return yes, no, or maybe. -%% -%% Type is a type as described in the comment for verified_type/1 at -%% the very end of this file, but it will *never* be 'any'. - -will_succeed(is_atom, Type) -> - case Type of - {atom,_} -> yes; - boolean -> yes; - _ -> no - end; -will_succeed(is_binary, Type) -> - case Type of - {binary,U} when U rem 8 =:= 0 -> yes; - {binary,_} -> maybe; - _ -> no - end; -will_succeed(is_bitstr, Type) -> - case Type of - {binary,_} -> yes; - _ -> no - end; -will_succeed(is_integer, Type) -> - case Type of - integer -> yes; - {integer,_} -> yes; - _ -> no - end; -will_succeed(is_map, Type) -> - case Type of - map -> yes; - _ -> no - end; -will_succeed(is_nonempty_list, Type) -> - case Type of - nonempty_list -> yes; - _ -> no - end; -will_succeed(is_tuple, Type) -> - case Type of - {tuple,_,_,_} -> yes; - _ -> no - end; -will_succeed(_, _) -> maybe. - -%% simplify_float([Instruction], TypeDatabase) -> -%% {[Instruction],TypeDatabase'} | not_possible -%% Simplify floating point operations in blocks. -%% -simplify_float(Is0, Ts0) -> - {Is1,Ts} = simplify_float_1(Is0, Ts0, [], []), - Is2 = opt_fmoves(Is1, []), - Is3 = flt_need_heap(Is2), - try - {flt_liveness(Is3),Ts} - catch - throw:not_possible -> not_possible - end. - -simplify_float_1([{set,[],[],fclearerror}|Is], Ts, Rs, Acc) -> - simplify_float_1(Is, Ts, Rs, clearerror(Acc)); -simplify_float_1([{set,[],[],fcheckerror}|Is], Ts, Rs, Acc) -> - simplify_float_1(Is, Ts, Rs, checkerror(Acc)); -simplify_float_1([{set,[{fr,_}],_,_}=I|Is], Ts, Rs, Acc) -> - simplify_float_1(Is, Ts, Rs, [I|Acc]); -simplify_float_1([{set,[D0],[A0],{alloc,_,{gc_bif,'-',{f,0}}}}=I|Is]=Is0, - Ts0, Rs0, Acc0) -> - case tdb_find(A0, Ts0) of - float -> - A = coerce_to_float(A0), - {Rs1,Acc1} = load_reg(A, Ts0, Rs0, Acc0), - {D,Rs} = find_dest(D0, Rs1), - Areg = fetch_reg(A, Rs), - Acc = [{set,[D],[Areg],{bif,fnegate,{f,0}}}|clearerror(Acc1)], - Ts = tdb_store(D0, float, Ts0), - simplify_float_1(Is, Ts, Rs, Acc); - _Other -> - Ts = update(I, Ts0), - {Rs,Acc} = flush(Rs0, Is0, Acc0), - simplify_float_1(Is, Ts, Rs, [I|checkerror(Acc)]) - end; -simplify_float_1([{set,[D0],[A0,B0],{alloc,_,{gc_bif,Op0,{f,0}}}}=I|Is]=Is0, - Ts0, Rs0, Acc0) -> - case float_op(Op0, A0, B0, Ts0) of - no -> - Ts = update(I, Ts0), - {Rs,Acc} = flush(Rs0, Is0, Acc0), - simplify_float_1(Is, Ts, Rs, [I|checkerror(Acc)]); - {yes,Op} -> - A = coerce_to_float(A0), - B = coerce_to_float(B0), - {Rs1,Acc1} = load_reg(A, Ts0, Rs0, Acc0), - {Rs2,Acc2} = load_reg(B, Ts0, Rs1, Acc1), - {D,Rs} = find_dest(D0, Rs2), - Areg = fetch_reg(A, Rs), - Breg = fetch_reg(B, Rs), - Acc = [{set,[D],[Areg,Breg],{bif,Op,{f,0}}}|clearerror(Acc2)], - Ts = tdb_store(D0, float, Ts0), - simplify_float_1(Is, Ts, Rs, Acc) - end; -simplify_float_1([{set,_,_,{try_catch,_,_}}=I|Is]=Is0, _Ts, Rs0, Acc0) -> - Acc = flush_all(Rs0, Is0, Acc0), - simplify_float_1(Is, tdb_new(), Rs0, [I|Acc]); -simplify_float_1([{set,_,_,{line,_}}=I|Is], Ts, Rs, Acc) -> - simplify_float_1(Is, Ts, Rs, [I|Acc]); -simplify_float_1([I|Is], Ts0, [], Acc) -> - Ts = update(I, Ts0), - simplify_float_1(Is, Ts, [], [I|Acc]); -simplify_float_1([I|Is]=Is0, Ts0, Rs0, Acc0) -> - Ts = update(I, Ts0), - {Rs,Acc} = flush(Rs0, Is0, Acc0), - simplify_float_1(Is, Ts, Rs, [I|checkerror(Acc)]); -simplify_float_1([], Ts, [], Acc) -> - Is = reverse(Acc), - {Is,Ts}. - -coerce_to_float({integer,I}=Int) -> - try float(I) of - F -> - {float,F} - catch _:_ -> - %% Let the overflow happen at run-time. - Int - end; -coerce_to_float(Other) -> Other. - -opt_fmoves([{set,[{x,_}=R],[{fr,_}]=Src,fmove}=I1, - {set,[_]=Dst,[{x,_}=R],move}=I2|Is], Acc) -> - case beam_utils:is_killed_block(R, Is) of - false -> opt_fmoves(Is, [I2,I1|Acc]); - true -> opt_fmoves(Is, [{set,Dst,Src,fmove}|Acc]) - end; -opt_fmoves([I|Is], Acc) -> - opt_fmoves(Is, [I|Acc]); -opt_fmoves([], Acc) -> reverse(Acc). - -clearerror(Is) -> - clearerror(Is, Is). - -clearerror([{set,[],[],fclearerror}|_], OrigIs) -> OrigIs; -clearerror([{set,[],[],fcheckerror}|_], OrigIs) -> [{set,[],[],fclearerror}|OrigIs]; -clearerror([_|Is], OrigIs) -> clearerror(Is, OrigIs); -clearerror([], OrigIs) -> [{set,[],[],fclearerror}|OrigIs]. - -%% merge_blocks(Block1, Block2) -> Block. -%% Combine two blocks and eliminate any move instructions that assign -%% to registers that are killed later in the block. -%% -merge_blocks(B1, [{'%anno',_}|B2]) -> - merge_blocks_1(B1++[{set,[],[],stop_here}|B2]). - -merge_blocks_1([{set,[],_,stop_here}|Is]) -> Is; -merge_blocks_1([{set,[D],_,move}=I|Is]) -> - case beam_utils:is_killed_block(D, Is) of - true -> merge_blocks_1(Is); - false -> [I|merge_blocks_1(Is)] - end; -merge_blocks_1([I|Is]) -> [I|merge_blocks_1(Is)]. - -%% flt_need_heap([Instruction]) -> [Instruction] -%% Insert need heap allocation instructions in the instruction stream -%% to properly account for both inserted floating point operations and -%% normal term build operations (such as put_list/3). -%% -%% Ignore old heap allocation instructions (except if they allocate a stack -%% frame too), as they may be in the wrong place (because gc_bif instructions -%% could have been converted to floating point operations). - -flt_need_heap(Is) -> - flt_need_heap_1(reverse(Is), 0, 0, []). - -flt_need_heap_1([{set,[],[],{alloc,_,Alloc}}|Is], H, Fl, Acc) -> - case Alloc of - {_,nostack,_,_} -> - %% Remove any existing test_heap/2 instruction. - flt_need_heap_1(Is, H, Fl, Acc); - {Z,Stk,_,Inits} when is_integer(Stk) -> - %% Keep any allocate*/2 instruction and recalculate heap need. - I = {set,[],[],{alloc,regs,{Z,Stk,build_alloc(H, Fl),Inits}}}, - flt_need_heap_1(Is, 0, 0, [I|Acc]) - end; -flt_need_heap_1([I|Is], H0, Fl0, Acc) -> - {Ns,H1,Fl1} = flt_need_heap_2(I, H0, Fl0), - flt_need_heap_1(Is, H1, Fl1, [I|Ns]++Acc); -flt_need_heap_1([], H, Fl, Acc) -> - flt_alloc(H, Fl) ++ Acc. - -%% First come all instructions that build. We pass through, while we -%% add to the need for heap words and floats on the heap. -flt_need_heap_2({set,[_],[{fr,_}],fmove}, H, Fl) -> - {[],H,Fl+1}; -flt_need_heap_2({set,_,_,put_list}, H, Fl) -> - {[],H+2,Fl}; -flt_need_heap_2({set,_,_,{put_tuple,_}}, H, Fl) -> - {[],H+1,Fl}; -flt_need_heap_2({set,_,_,put}, H, Fl) -> - {[],H+1,Fl}; -%% The following instructions cause the insertion of an allocation -%% instruction if needed. -flt_need_heap_2({set,_,_,{alloc,_,_}}, H, Fl) -> - {flt_alloc(H, Fl),0,0}; -flt_need_heap_2({set,_,_,{set_tuple_element,_}}, H, Fl) -> - {flt_alloc(H, Fl),0,0}; -flt_need_heap_2({'%anno',_}, H, Fl) -> - {flt_alloc(H, Fl),0,0}; -%% All other instructions are "neutral". We just pass them. -flt_need_heap_2(_, H, Fl) -> - {[],H,Fl}. - -flt_alloc(0, 0) -> - []; -flt_alloc(H, 0) -> - [{set,[],[],{alloc,regs,{nozero,nostack,H,[]}}}]; -flt_alloc(H, F) -> - [{set,[],[],{alloc,regs,{nozero,nostack, - build_alloc(H, F),[]}}}]. - -build_alloc(Words, 0) -> Words; -build_alloc(Words, Floats) -> {alloc,[{words,Words},{floats,Floats}]}. - - -%% flt_liveness([Instruction]) -> [Instruction] -%% (Re)calculate the number of live registers for each heap allocation -%% function. We base liveness of the number of register map at the -%% beginning of the instruction sequence. -%% -%% A 'not_possible' term will be thrown if the set of live registers -%% is not continous at an allocation function (e.g. if {x,0} and {x,2} -%% are live, but not {x,1}). - -flt_liveness([{'%anno',{used,Regs}}=LiveInstr|Is]) -> - flt_liveness_1(Is, Regs, [LiveInstr]). - -flt_liveness_1([{set,Ds,Ss,{alloc,Live0,Alloc}}|Is], Regs0, Acc) -> - Live = min(Live0, live_regs(Regs0)), - I = {set,Ds,Ss,{alloc,Live,Alloc}}, - Regs1 = init_regs(Live), - Regs = x_live(Ds, Regs1), - flt_liveness_1(Is, Regs, [I|Acc]); -flt_liveness_1([{set,Ds,_,_}=I|Is], Regs0, Acc) -> - Regs = x_live(Ds, Regs0), - flt_liveness_1(Is, Regs, [I|Acc]); -flt_liveness_1([{'%anno',_}], _Regs, Acc) -> - reverse(Acc). - -init_regs(Live) -> - (1 bsl Live) - 1. - -live_regs(Regs) -> - live_regs_1(Regs, 0). - -live_regs_1(0, N) -> N; -live_regs_1(R, N) -> - case R band 1 of - 0 -> throw(not_possible); - 1 -> live_regs_1(R bsr 1, N+1) - end. - -x_live([{x,N}|Rs], Regs) -> x_live(Rs, Regs bor (1 bsl N)); -x_live([_|Rs], Regs) -> x_live(Rs, Regs); -x_live([], Regs) -> Regs. - -%% update(Instruction, TypeDb) -> NewTypeDb -%% Update the type database to account for executing an instruction. -%% -%% First the cases for instructions inside basic blocks. -update({'%anno',_}, Ts) -> - Ts; -update({set,[D],[S],move}, Ts) -> - tdb_copy(S, D, Ts); -update({set,[D],[Index,Reg],{bif,element,_}}, Ts0) -> - MinSize = case Index of - {integer,I} -> I; - _ -> 0 - end, - Ts = tdb_meet(Reg, {tuple,min_size,MinSize,[]}, Ts0), - tdb_store(D, any, Ts); -update({set,[D],[_Key,Map],{bif,map_get,_}}, Ts0) -> - Ts = tdb_meet(Map, map, Ts0), - tdb_store(D, any, Ts); -update({set,[D],Args,{bif,N,_}}, Ts) -> - Ar = length(Args), - BoolOp = erl_internal:new_type_test(N, Ar) orelse - erl_internal:comp_op(N, Ar) orelse - erl_internal:bool_op(N, Ar), - Type = case BoolOp of - true -> boolean; - false -> unary_op_type(N) - end, - tdb_store(D, Type, Ts); -update({set,[D],[S],{get_tuple_element,0}}, Ts0) -> - if - D =:= S -> - tdb_store(D, any, Ts0); - true -> - Ts = tdb_store(D, {tuple_element,S,0}, Ts0), - tdb_store(S, {tuple,min_size,1,[]}, Ts) - end; -update({set,[D],[S],{alloc,_,{gc_bif,float,{f,0}}}}, Ts0) -> - %% Make sure we reject non-numeric literal argument. - case possibly_numeric(S) of - true -> tdb_store(D, float, Ts0); - false -> Ts0 - end; -update({set,[D],[S1,S2],{alloc,_,{gc_bif,'band',{f,0}}}}, Ts) -> - Type = band_type(S1, S2, Ts), - tdb_store(D, Type, Ts); -update({set,[D],[S1,S2],{alloc,_,{gc_bif,'/',{f,0}}}}, Ts) -> - %% Make sure we reject non-numeric literals. - case possibly_numeric(S1) andalso possibly_numeric(S2) of - true -> tdb_store(D, float, Ts); - false -> Ts - end; -update({set,[D],[S1,S2],{alloc,_,{gc_bif,Op,{f,0}}}}, Ts0) -> - case op_type(Op) of - integer -> - tdb_store(D, integer, Ts0); - {float,_} -> - case {tdb_find(S1, Ts0),tdb_find(S2, Ts0)} of - {float,_} -> tdb_store(D, float, Ts0); - {_,float} -> tdb_store(D, float, Ts0); - {_,_} -> tdb_store(D, any, Ts0) - end; - Type -> - tdb_store(D, Type, Ts0) - end; -update({set,[D],[_],{alloc,_,{gc_bif,Op,{f,0}}}}, Ts) -> - tdb_store(D, unary_op_type(Op), Ts); -update({set,[],_Src,_Op}, Ts) -> - Ts; -update({set,[D],_Src,_Op}, Ts) -> - tdb_store(D, any, Ts); -update({kill,D}, Ts) -> - tdb_store(D, any, Ts); - -%% Instructions outside of blocks. -update({test,test_arity,_Fail,[Src,Arity]}, Ts) -> - tdb_meet(Src, {tuple,exact_size,Arity,[]}, Ts); -update({get_map_elements,_,Src,{list,Elems0}}, Ts0) -> - Ts1 = tdb_meet(Src, map, Ts0), - {_Ss,Ds} = beam_utils:split_even(Elems0), - foldl(fun(Dst, A) -> tdb_store(Dst, any, A) end, Ts1, Ds); -update({test,is_eq_exact,_,[Reg,{atom,_}=Atom]}, Ts0) -> - Ts = case tdb_find_source_tuple(Reg, Ts0) of - {source_tuple,TupleReg} -> - tdb_meet(TupleReg, {tuple,min_size,1,[Atom]}, Ts0); - none -> - Ts0 - end, - tdb_meet(Reg, Atom, Ts); -update({test,is_record,_Fail,[Src,Tag,{integer,Arity}]}, Ts) -> - tdb_meet(Src, {tuple,exact_size,Arity,[Tag]}, Ts); - -%% Binaries and binary matching. - -update({test,bs_get_integer2,_,_,Args,Dst}, Ts) -> - tdb_store(Dst, get_bs_integer_type(Args), Ts); -update({test,bs_get_utf8,_,_,_,Dst}, Ts) -> - tdb_store(Dst, ?UNICODE_INT, Ts); -update({test,bs_get_utf16,_,_,_,Dst}, Ts) -> - tdb_store(Dst, ?UNICODE_INT, Ts); -update({test,bs_get_utf32,_,_,_,Dst}, Ts) -> - tdb_store(Dst, ?UNICODE_INT, Ts); -update({bs_init,_,{bs_init2,_,_},_,_,Dst}, Ts) -> - tdb_store(Dst, {binary,8}, Ts); -update({bs_init,_,_,_,_,Dst}, Ts) -> - tdb_store(Dst, {binary,1}, Ts); -update({bs_put,_,_,_}, Ts) -> - Ts; -update({bs_save2,_,_}, Ts) -> - Ts; -update({bs_restore2,_,_}, Ts) -> - Ts; -update({bs_context_to_binary,Dst}, Ts) -> - tdb_store(Dst, any, Ts); -update({test,bs_start_match2,_,_,[Src,_],Dst}, Ts0) -> - Ts = tdb_meet(Src, {binary,1}, Ts0), - tdb_copy(Src, Dst, Ts); -update({test,bs_get_binary2,_,_,[_,_,Unit,_],Dst}, Ts) -> - true = is_integer(Unit), %Assertion. - tdb_store(Dst, {binary,Unit}, Ts); -update({test,bs_get_float2,_,_,_,Dst}, Ts) -> - tdb_store(Dst, float, Ts); -update({test,bs_test_unit,_,[Src,Unit]}, Ts) -> - tdb_meet(Src, {binary,Unit}, Ts); - -%% Other test instructions -update({test,Test,_Fail,[Src]}, Ts) -> - Type = case Test of - is_binary -> {binary,8}; - is_bitstr -> {binary,1}; - is_boolean -> boolean; - is_float -> float; - is_integer -> integer; - is_map -> map; - is_nonempty_list -> nonempty_list; - _ -> any - end, - tdb_meet(Src, Type, Ts); -update({test,_Test,_Fail,_Other}, Ts) -> - Ts; - -%% Calls - -update({call_ext,Ar,{extfunc,math,Math,Ar}}, Ts) -> - case is_math_bif(Math, Ar) of - true -> tdb_store({x,0}, float, Ts); - false -> tdb_kill_xregs(Ts) - end; -update({call_ext,3,{extfunc,erlang,setelement,3}}, Ts0) -> - Ts = tdb_kill_xregs(Ts0), - case tdb_find({x,1}, Ts0) of - {tuple,SzKind,Sz,_}=T0 -> - T = case tdb_find({x,0}, Ts0) of - {integer,{I,I}} when I > 1 -> - %% First element is not changed. The result - %% will have the same type. - T0; - _ -> - %% Position is 1 or unknown. May change the - %% first element of the tuple. - {tuple,SzKind,Sz,[]} - end, - tdb_store({x,0}, T, Ts); - _ -> - Ts - end; -update({call,_Arity,_Func}, Ts) -> tdb_kill_xregs(Ts); -update({call_ext,_Arity,_Func}, Ts) -> tdb_kill_xregs(Ts); -update({make_fun2,_,_,_,_}, Ts) -> tdb_kill_xregs(Ts); -update({call_fun, _}, Ts) -> tdb_kill_xregs(Ts); -update({apply, _}, Ts) -> tdb_kill_xregs(Ts); - -update({line,_}, Ts) -> Ts; -update({'%',_}, Ts) -> Ts; - -%% The instruction is unknown. Kill all information. -update(_I, _Ts) -> tdb_new(). - -band_type({integer,Int}, Other, Ts) -> - band_type_1(Int, Other, Ts); -band_type(Other, {integer,Int}, Ts) -> - band_type_1(Int, Other, Ts); -band_type(_, _, _) -> integer. - -band_type_1(Int, OtherSrc, Ts) -> - Type = band_type_2(Int, 0), - OtherType = tdb_find(OtherSrc, Ts), - meet(Type, OtherType). - -band_type_2(N, Bits) when Bits < 64 -> - case 1 bsl Bits of - P when P =:= N + 1 -> - {integer,{0,N}}; - P when P > N + 1 -> - integer; - _ -> - band_type_2(N, Bits+1) - end; -band_type_2(_, _) -> - %% Negative or large positive number. Give up. - integer. - -get_bs_integer_type([_,{integer,N},U,{field_flags,Fl}]) - when N*U < 64 -> - NumBits = N*U, - case member(unsigned, Fl) of - true -> - {integer,{0,(1 bsl NumBits)-1}}; - false -> - %% Signed integer. Don't bother. - integer - end; -get_bs_integer_type(_) -> - %% Avoid creating ranges with a huge upper limit. - integer. - -is_math_bif(cos, 1) -> true; -is_math_bif(cosh, 1) -> true; -is_math_bif(sin, 1) -> true; -is_math_bif(sinh, 1) -> true; -is_math_bif(tan, 1) -> true; -is_math_bif(tanh, 1) -> true; -is_math_bif(acos, 1) -> true; -is_math_bif(acosh, 1) -> true; -is_math_bif(asin, 1) -> true; -is_math_bif(asinh, 1) -> true; -is_math_bif(atan, 1) -> true; -is_math_bif(atanh, 1) -> true; -is_math_bif(erf, 1) -> true; -is_math_bif(erfc, 1) -> true; -is_math_bif(exp, 1) -> true; -is_math_bif(log, 1) -> true; -is_math_bif(log2, 1) -> true; -is_math_bif(log10, 1) -> true; -is_math_bif(sqrt, 1) -> true; -is_math_bif(atan2, 2) -> true; -is_math_bif(pow, 2) -> true; -is_math_bif(ceil, 1) -> true; -is_math_bif(floor, 1) -> true; -is_math_bif(fmod, 2) -> true; -is_math_bif(pi, 0) -> true; -is_math_bif(_, _) -> false. - -%% Reject non-numeric literals. -possibly_numeric({x,_}) -> true; -possibly_numeric({y,_}) -> true; -possibly_numeric({integer,_}) -> true; -possibly_numeric({float,_}) -> true; -possibly_numeric(_) -> false. - -max_tuple_size(Reg, Ts) -> - case tdb_find(Reg, Ts) of - {tuple,_,Sz,_} -> Sz; - _Other -> 0 - end. - -float_op('/', A, B, _) -> - case possibly_numeric(A) andalso possibly_numeric(B) of - true -> {yes,fdiv}; - false -> no - end; -float_op(Op, {float,_}, B, _) -> - case possibly_numeric(B) of - true -> arith_op(Op); - false -> no - end; -float_op(Op, A, {float,_}, _) -> - case possibly_numeric(A) of - true -> arith_op(Op); - false -> no - end; -float_op(Op, A, B, Ts) -> - case {tdb_find(A, Ts),tdb_find(B, Ts)} of - {float,_} -> arith_op(Op); - {_,float} -> arith_op(Op); - {_,_} -> no - end. - -find_dest(V, Rs0) -> - case find_reg(V, Rs0) of - {ok,FR} -> - {FR,mark(V, Rs0, dirty)}; - error -> - Rs = put_reg(V, Rs0, dirty), - {ok,FR} = find_reg(V, Rs), - {FR,Rs} - end. - -load_reg({float,_}=F, _, Rs0, Is0) -> - Rs = put_reg(F, Rs0, clean), - {ok,FR} = find_reg(F, Rs), - Is = [{set,[FR],[F],fmove}|Is0], - {Rs,Is}; -load_reg(V, Ts, Rs0, Is0) -> - case find_reg(V, Rs0) of - {ok,_FR} -> {Rs0,Is0}; - error -> - Rs = put_reg(V, Rs0, clean), - {ok,FR} = find_reg(V, Rs), - Op = case tdb_find(V, Ts) of - float -> fmove; - _ -> fconv - end, - Is = [{set,[FR],[V],Op}|Is0], - {Rs,Is} - end. - -arith_op(Op) -> - case op_type(Op) of - {float,Instr} -> {yes,Instr}; - _ -> no - end. - -op_type('+') -> {float,fadd}; -op_type('-') -> {float,fsub}; -op_type('*') -> {float,fmul}; -%% '/' and 'band' are specially handled. -op_type('bor') -> integer; -op_type('bxor') -> integer; -op_type('bsl') -> integer; -op_type('bsr') -> integer; -op_type('div') -> integer; -op_type(_) -> any. - -unary_op_type(bit_size) -> integer; -unary_op_type(byte_size) -> integer; -unary_op_type(length) -> integer; -unary_op_type(map_size) -> integer; -unary_op_type(size) -> integer; -unary_op_type(tuple_size) -> integer; -unary_op_type(_) -> any. - -flush(Rs, [{set,[_],[_,_,_],{bif,is_record,_}}|_]=Is0, Acc0) -> - Acc = flush_all(Rs, Is0, Acc0), - {[],Acc}; -flush(Rs, [{set,[_],[],{put_tuple,_}}|_]=Is0, Acc0) -> - Acc = flush_all(Rs, Is0, Acc0), - {[],Acc}; -flush(Rs0, [{set,Ds,Ss,_Op}|_], Acc0) -> - Save = cerl_sets:from_list(Ss), - Acc = save_regs(Rs0, Save, Acc0), - Rs1 = foldl(fun(S, A) -> mark(S, A, clean) end, Rs0, Ss), - Kill = cerl_sets:from_list(Ds), - Rs = kill_regs(Rs1, Kill), - {Rs,Acc}; -flush(Rs0, Is, Acc0) -> - Acc = flush_all(Rs0, Is, Acc0), - {[],Acc}. - -flush_all([{_,{float,_},_}|Rs], Is, Acc) -> - flush_all(Rs, Is, Acc); -flush_all([{I,V,dirty}|Rs], Is, Acc0) -> - Acc = checkerror(Acc0), - case beam_utils:is_killed_block(V, Is) of - true -> flush_all(Rs, Is, Acc); - false -> flush_all(Rs, Is, [{set,[V],[{fr,I}],fmove}|Acc]) - end; -flush_all([{_,_,clean}|Rs], Is, Acc) -> flush_all(Rs, Is, Acc); -flush_all([free|Rs], Is, Acc) -> flush_all(Rs, Is, Acc); -flush_all([], _, Acc) -> Acc. - -save_regs(Rs, Save, Acc) -> - foldl(fun(R, A) -> save_reg(R, Save, A) end, Acc, Rs). - -save_reg({I,V,dirty}, Save, Acc) -> - case cerl_sets:is_element(V, Save) of - true -> [{set,[V],[{fr,I}],fmove}|checkerror(Acc)]; - false -> Acc - end; -save_reg(_, _, Acc) -> Acc. - -kill_regs(Rs, Kill) -> - [kill_reg(R, Kill) || R <- Rs]. - -kill_reg({_,V,_}=R, Kill) -> - case cerl_sets:is_element(V, Kill) of - true -> free; - false -> R - end; -kill_reg(R, _) -> R. - -mark(V, [{I,V,_}|Rs], Mark) -> [{I,V,Mark}|Rs]; -mark(V, [R|Rs], Mark) -> [R|mark(V, Rs, Mark)]; -mark(_, [], _) -> []. - -fetch_reg(V, [{I,V,_}|_]) -> {fr,I}; -fetch_reg(V, [_|SRs]) -> fetch_reg(V, SRs). - -find_reg(V, [{I,V,_}|_]) -> {ok,{fr,I}}; -find_reg(V, [_|SRs]) -> find_reg(V, SRs); -find_reg(_, []) -> error. - -put_reg(V, Rs, Dirty) -> put_reg_1(V, Rs, Dirty, 0). - -put_reg_1(V, [free|Rs], Dirty, I) -> [{I,V,Dirty}|Rs]; -put_reg_1(V, [R|Rs], Dirty, I) -> [R|put_reg_1(V, Rs, Dirty, I+1)]; -put_reg_1(V, [], Dirty, I) -> [{I,V,Dirty}]. - -checkerror(Is) -> - checkerror_1(Is, Is). - -checkerror_1([{set,[],[],fcheckerror}|_], OrigIs) -> OrigIs; -checkerror_1([{set,_,_,{bif,fadd,_}}|_], OrigIs) -> checkerror_2(OrigIs); -checkerror_1([{set,_,_,{bif,fsub,_}}|_], OrigIs) -> checkerror_2(OrigIs); -checkerror_1([{set,_,_,{bif,fmul,_}}|_], OrigIs) -> checkerror_2(OrigIs); -checkerror_1([{set,_,_,{bif,fdiv,_}}|_], OrigIs) -> checkerror_2(OrigIs); -checkerror_1([{set,_,_,{bif,fnegate,_}}|_], OrigIs) -> checkerror_2(OrigIs); -checkerror_1([_|Is], OrigIs) -> checkerror_1(Is, OrigIs); -checkerror_1([], OrigIs) -> OrigIs. - -checkerror_2(OrigIs) -> [{set,[],[],fcheckerror}|OrigIs]. - - -%%% Routines for maintaining a type database. The type database -%%% associates type information with registers. -%%% -%%% See the comment for verified_type/1 at the end of module for -%%% a description of the possible types. - -%% tdb_new() -> EmptyDataBase -%% Creates a new, empty type database. - -tdb_new() -> []. - -%% tdb_find(Register, Db) -> Type -%% Returns type information or the atom error if there is no type -%% information available for Register. -%% -%% See the comment for verified_type/1 at the end of module for -%% a description of the possible types. - -tdb_find(Reg, Ts) -> - case tdb_find_raw(Reg, Ts) of - {tuple_element,_,_} -> any; - Type -> Type - end. - -%% tdb_find_source_tuple(Register, Ts) -> {source_tuple,Register} | 'none'. -%% Find the tuple whose first element was fetched to the register Register. - -tdb_find_source_tuple(Reg, Ts) -> - case tdb_find_raw(Reg, Ts) of - {tuple_element,Src,0} -> - {source_tuple,Src}; - _ -> - none - end. - -%% tdb_copy(Source, Dest, Db) -> Db' -%% Update the type information for Dest to have the same type -%% as the Source. - -tdb_copy({Tag,_}=S, D, Ts) when Tag =:= x; Tag =:= y -> - case tdb_find_raw(S, Ts) of - any -> orddict:erase(D, Ts); - Type -> orddict:store(D, Type, Ts) - end; -tdb_copy(Literal, D, Ts) -> - Type = case Literal of - {atom,_} -> Literal; - {float,_} -> float; - {integer,Int} -> {integer,{Int,Int}}; - {literal,[_|_]} -> nonempty_list; - {literal,#{}} -> map; - {literal,Tuple} when tuple_size(Tuple) >= 1 -> - Lit = tag_literal(element(1, Tuple)), - {tuple,exact_size,tuple_size(Tuple),[Lit]}; - _ -> any - end, - tdb_store(D, verified_type(Type), Ts). - -%% tdb_store(Register, Type, Ts0) -> Ts. -%% Store a new type for register Register. Return the update type -%% database. Use this function when a new value is assigned to -%% a register. -%% -%% See the comment for verified_type/1 at the end of module for -%% a description of the possible types. - -tdb_store(Reg, any, Ts) -> - erase(Reg, Ts); -tdb_store(Reg, Type, Ts) -> - store(Reg, verified_type(Type), Ts). - -store(Key, New, [{K,_}|_]=Dict) when Key < K -> - [{Key,New}|Dict]; -store(Key, New, [{K,Val}=E|Dict]) when Key > K -> - case Val of - {tuple_element,Key,_} -> store(Key, New, Dict); - _ -> [E|store(Key, New, Dict)] - end; -store(Key, New, [{_K,Old}|Dict]) -> %Key == K - case Old of - {tuple,_,_,_} -> - [{Key,New}|erase_tuple_element(Key, Dict)]; - _ -> - [{Key,New}|Dict] - end; -store(Key, New, []) -> [{Key,New}]. - -erase(Key, [{K,_}=E|Dict]) when Key < K -> - [E|Dict]; -erase(Key, [{K,Val}=E|Dict]) when Key > K -> - case Val of - {tuple_element,Key,_} -> erase(Key, Dict); - _ -> [E|erase(Key, Dict)] - end; -erase(Key, [{_K,Val}|Dict]) -> %Key == K - case Val of - {tuple,_,_,_} -> erase_tuple_element(Key, Dict); - _ -> Dict - end; -erase(_, []) -> []. - -erase_tuple_element(Key, [{_,{tuple_element,Key,_}}|Dict]) -> - erase_tuple_element(Key, Dict); -erase_tuple_element(Key, [E|Dict]) -> - [E|erase_tuple_element(Key, Dict)]; -erase_tuple_element(_Key, []) -> []. - -%% tdb_meet(Register, Type, Ts0) -> Ts. -%% Update information of a register that is used as the source for an -%% instruction. The type Type will be combined using the meet operation -%% with the previous type information for the register, resulting in -%% narrower (more specific) type. -%% -%% For example, if the previous type is {tuple,min_size,2,[]} and the -%% the new type is {tuple,exact_size,5,[]}, the meet of the types will -%% be {tuple,exact_size,5,[]}. -%% -%% See the comment for verified_type/1 at the end of module for -%% a description of the possible types. - -tdb_meet(Reg, NewType, Ts) -> - Update = fun(Type0) -> meet(Type0, NewType) end, - orddict:update(Reg, Update, NewType, Ts). - -%%% -%%% Here follows internal helper functions for accessing and -%%% updating the type database. -%%% - -tdb_find_raw({x,_}=K, Ts) -> tdb_find_raw_1(K, Ts); -tdb_find_raw({y,_}=K, Ts) -> tdb_find_raw_1(K, Ts); -tdb_find_raw(_, _) -> any. - -tdb_find_raw_1(K, Ts) -> - case orddict:find(K, Ts) of - {ok,Val} -> Val; - error -> any - end. - -tag_literal(A) when is_atom(A) -> {atom,A}; -tag_literal(F) when is_float(F) -> {float,F}; -tag_literal(I) when is_integer(I) -> {integer,I}; -tag_literal([]) -> nil; -tag_literal(Lit) -> {literal,Lit}. - -%% tdb_kill_xregs(Db) -> NewDb -%% Kill all information about x registers. Also kill all tuple_element -%% dependencies from y registers to x registers. - -tdb_kill_xregs([{{x,_},_Type}|Db]) -> tdb_kill_xregs(Db); -tdb_kill_xregs([{{y,_},{tuple_element,{x,_},_}}|Db]) -> tdb_kill_xregs(Db); -tdb_kill_xregs([Any|Db]) -> [Any|tdb_kill_xregs(Db)]; -tdb_kill_xregs([]) -> []. - -%% meet(Type1, Type2) -> Type -%% Returns the "meet" of Type1 and Type2. The meet is a narrower -%% type than Type1 and Type2. For example: -%% -%% meet(integer, {integer,{0,3}}) -> {integer,{0,3}} -%% -%% The meet for two different types result in 'none', which is -%% the bottom element for our type lattice: -%% -%% meet(integer, map) -> none - -meet(T, T) -> - T; -meet({integer,_}=T, integer) -> - T; -meet(integer, {integer,_}=T) -> - T; -meet({integer,{Min1,Max1}}, {integer,{Min2,Max2}}) -> - {integer,{max(Min1, Min2),min(Max1, Max2)}}; -meet({tuple,min_size,Sz1,Same}, {tuple,min_size,Sz2,Same}=Max) when Sz1 < Sz2 -> - Max; -meet({tuple,min_size,Sz1,Same}=Max, {tuple,min_size,Sz2,Same}) when Sz1 > Sz2 -> - Max; -meet({tuple,exact_size,_,Same}=Exact, {tuple,_,_,Same}) -> - Exact; -meet({tuple,_,_,Same},{tuple,exact_size,_,Same}=Exact) -> - Exact; -meet({tuple,SzKind1,Sz1,[]}, {tuple,_SzKind2,_Sz2,First}=Tuple2) -> - meet({tuple,SzKind1,Sz1,First}, Tuple2); -meet({tuple,_SzKind1,_Sz1,First}=Tuple1, {tuple,SzKind2,Sz2,_}) -> - meet(Tuple1, {tuple,SzKind2,Sz2,First}); -meet({binary,U1}, {binary,U2}) -> - {binary,max(U1, U2)}; -meet(T1, T2) -> - case is_any(T1) of - true -> - verified_type(T2); - false -> - case is_any(T2) of - true -> - verified_type(T1); - false -> - none %The bottom element. - end - end. - -is_any(any) -> true; -is_any({tuple_element,_,_}) -> true; -is_any(_) -> false. - -%% verified_type(Type) -> Type -%% Returns the passed in type if it is one of the defined types. -%% Crashes if there is anything wrong with the type. -%% -%% Here are all possible types: -%% -%% any Any Erlang term (top element for the type lattice). -%% -%% {atom,Atom} The specific atom Atom. -%% {binary,Unit} Binary/bitstring aligned to unit Unit. -%% boolean 'true' | 'false' -%% float Floating point number. -%% integer Integer. -%% {integer,{Min,Max}} Integer in the inclusive range Min through Max. -%% map Map. -%% nonempty_list Nonempty list. -%% {tuple,_,_,_} Tuple (see below). -%% -%% none No type (bottom element for the type lattice). -%% -%% {tuple,min_size,Size,First} means that the corresponding register -%% contains a tuple with *at least* Size elements (conversely, -%% {tuple,exact_size,Size,First} means that it contains a tuple with -%% *exactly* Size elements). An tuple with unknown size is -%% represented as {tuple,min_size,0,[]}. First is either [] (meaning -%% that the tuple's first element is unknown) or [FirstElement] (the -%% contents of the first element). -%% -%% There is also a pseudo-type called {tuple_element,_,_}: -%% -%% {tuple_element,SrcTuple,ElementNumber} -%% -%% that does not provide any information about the type of the -%% register itself, but provides a link back to the source tuple that -%% the register got its value from. -%% -%% Note that {tuple_element,_,_} will *never* be returned by tdb_find/2. -%% Use tdb_find_source_tuple/2 to locate the source tuple for a register. - -verified_type(any=T) -> T; -verified_type({atom,_}=T) -> T; -verified_type({binary,U}=T) when is_integer(U) -> T; -verified_type(boolean=T) -> T; -verified_type(integer=T) -> T; -verified_type({integer,{Min,Max}}=T) - when is_integer(Min), is_integer(Max) -> T; -verified_type(map=T) -> T; -verified_type(nonempty_list=T) -> T; -verified_type({tuple,_,Sz,[]}=T) when is_integer(Sz) -> T; -verified_type({tuple,_,Sz,[_]}=T) when is_integer(Sz) -> T; -verified_type({tuple_element,_,_}=T) -> T; -verified_type(float=T) -> T. diff --git a/lib/compiler/src/v3_codegen.erl b/lib/compiler/src/v3_codegen.erl deleted file mode 100644 index e9152ba88f..0000000000 --- a/lib/compiler/src/v3_codegen.erl +++ /dev/null @@ -1,2925 +0,0 @@ -%% -%% %CopyrightBegin% -%% -%% Copyright Ericsson AB 1999-2018. 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% -%% -%% Purpose : Code generator for Beam. - --module(v3_codegen). - -%% The main interface. --export([module/2]). - --import(lists, [member/2,keymember/3,keysort/2,keydelete/3, - append/1,flatmap/2,filter/2,foldl/3,foldr/3,mapfoldl/3, - sort/1,reverse/1,reverse/2,map/2]). --import(ordsets, [add_element/2,intersection/2,union/2]). - --include("v3_kernel.hrl"). - -%% These are not defined in v3_kernel.hrl. -get_kanno(Kthing) -> element(2, Kthing). -set_kanno(Kthing, Anno) -> setelement(2, Kthing, Anno). - -%% Main codegen structure. --record(cg, {lcount=1, %Label counter - bfail, %Fail label for BIFs - break, %Break label - recv, %Receive label - is_top_block, %Boolean: top block or not - functable=#{}, %Map of local functions: {Name,Arity}=>Label - in_catch=false, %Inside a catch or not. - need_frame, %Need a stack frame. - ultimate_failure, %Label for ultimate match failure. - ctx %Match context. - }). - -%% Stack/register state record. --record(sr, {reg=[], %Register table - stk=[], %Stack table - res=[]}). %Registers to reserve - -%% Internal records. --record(cg_need_heap, {anno=[] :: term(), - h=0 :: integer()}). --record(cg_block, {anno=[] :: term(), - es=[] :: [term()]}). - --type vdb_entry() :: {atom(),non_neg_integer(),non_neg_integer()}. - --record(l, {i=0 :: non_neg_integer(), %Op number - vdb=[] :: [vdb_entry()], %Variable database - a=[] :: [term()]}). %Core annotation - --spec module(#k_mdef{}, [compile:option()]) -> {'ok',beam_asm:module_code()}. - -module(#k_mdef{name=Mod,exports=Es,attributes=Attr,body=Forms}, _Opts) -> - {Asm,St} = functions(Forms, {atom,Mod}), - {ok,{Mod,Es,Attr,Asm,St#cg.lcount}}. - -functions(Forms, AtomMod) -> - mapfoldl(fun (F, St) -> function(F, AtomMod, St) end, #cg{lcount=1}, Forms). - -function(#k_fdef{anno=#k{a=Anno},func=Name,arity=Arity, - vars=As,body=Kb}, AtomMod, St0) -> - try - #k_match{} = Kb, %Assertion. - - %% Try to suppress the stack frame unless it is - %% really needed. - Body0 = avoid_stack_frame(Kb), - - %% Annotate kernel records with variable usage. - Vdb0 = init_vars(As), - {Body,_,Vdb} = body(Body0, 1, Vdb0), - - %% Generate the BEAM assembly code. - {Asm,EntryLabel,St} = cg_fun(Body, As, Vdb, AtomMod, - {Name,Arity}, Anno, St0), - Func = {function,Name,Arity,EntryLabel,Asm}, - {Func,St} - catch - Class:Error:Stack -> - io:fwrite("Function: ~w/~w\n", [Name,Arity]), - erlang:raise(Class, Error, Stack) - end. - - -%% avoid_stack_frame(Kernel) -> Kernel' -%% If possible, avoid setting up a stack frame. Functions -%% that only do matching, calls to guard BIFs, and tail-recursive -%% calls don't need a stack frame. - -avoid_stack_frame(#k_match{body=Body}=M) -> - try - M#k_match{body=avoid_stack_frame_1(Body)} - catch - impossible -> - M - end. - -avoid_stack_frame_1(#k_alt{first=First0,then=Then0}=Alt) -> - First = avoid_stack_frame_1(First0), - Then = avoid_stack_frame_1(Then0), - Alt#k_alt{first=First,then=Then}; -avoid_stack_frame_1(#k_bif{op=Op}=Bif) -> - case Op of - #k_internal{} -> - %% Most internal BIFs clobber the X registers. - throw(impossible); - _ -> - Bif - end; -avoid_stack_frame_1(#k_break{anno=Anno,args=Args}) -> - #k_guard_break{anno=Anno,args=Args}; -avoid_stack_frame_1(#k_guard_break{}=Break) -> - Break; -avoid_stack_frame_1(#k_enter{}=Enter) -> - %% Tail-recursive calls don't need a stack frame. - Enter; -avoid_stack_frame_1(#k_guard{clauses=Cs0}=Guard) -> - Cs = avoid_stack_frame_list(Cs0), - Guard#k_guard{clauses=Cs}; -avoid_stack_frame_1(#k_guard_clause{guard=G0,body=B0}=C) -> - G = avoid_stack_frame_1(G0), - B = avoid_stack_frame_1(B0), - C#k_guard_clause{guard=G,body=B}; -avoid_stack_frame_1(#k_match{anno=A,vars=Vs,body=B0,ret=Ret}) -> - %% Use #k_guard_match{} instead to avoid saving the X registers - %% to the stack before matching. - B = avoid_stack_frame_1(B0), - #k_guard_match{anno=A,vars=Vs,body=B,ret=Ret}; -avoid_stack_frame_1(#k_guard_match{body=B0}=M) -> - B = avoid_stack_frame_1(B0), - M#k_guard_match{body=B}; -avoid_stack_frame_1(#k_protected{arg=Arg0}=Prot) -> - Arg = avoid_stack_frame_1(Arg0), - Prot#k_protected{arg=Arg}; -avoid_stack_frame_1(#k_put{}=Put) -> - Put; -avoid_stack_frame_1(#k_return{}=Ret) -> - Ret; -avoid_stack_frame_1(#k_select{var=#k_var{anno=Vanno},types=Types0}=Select) -> - case member(reuse_for_context, Vanno) of - false -> - Types = avoid_stack_frame_list(Types0), - Select#k_select{types=Types}; - true -> - %% Including binary patterns that overwrite the register containing - %% the binary with the match context may not be safe. For example, - %% bs_match_SUITE:bin_tail_e/1 with inlining will be rejected by - %% beam_validator. - %% - %% Essentially the following code is produced: - %% - %% bs_match {x,0} => {x,0} - %% ... - %% bs_match {x,0} => {x,1} %% ILLEGAL - %% - %% A bs_match instruction will only accept a match context as the - %% source operand if the source and destination registers are the - %% the same (as in the first bs_match instruction above). - %% The second bs_match instruction is therefore illegal. - %% - %% This situation is avoided if there is a stack frame: - %% - %% move {x,0} => {y,0} - %% bs_match {x,0} => {x,0} - %% ... - %% bs_match {y,0} => {x,1} %% LEGAL - %% - throw(impossible) - end; -avoid_stack_frame_1(#k_seq{arg=#k_call{anno=Anno,op=Op}=Call, - body=#k_break{args=BrArgs0}}=Seq) -> - case Op of - #k_remote{mod=#k_atom{val=Mod}, - name=#k_atom{val=Name}, - arity=Arity} -> - case erl_bifs:is_exit_bif(Mod, Name, Arity) of - false -> - %% Will clobber X registers. Must have a stack frame. - throw(impossible); - true -> - %% The call to this BIF will never return. It is safe - %% to suppress the stack frame. - Bif = #k_bif{anno=Anno, - op=#k_internal{name=guard_error,arity=1}, - args=[Call],ret=[]}, - BrArgs = lists:duplicate(length(BrArgs0), #k_nil{}), - GB = #k_guard_break{anno=#k{us=[],ns=[],a=[]},args=BrArgs}, - Seq#k_seq{arg=Bif,body=GB} - end; - _ -> - %% Will clobber X registers. Must have a stack frame. - throw(impossible) - end; -avoid_stack_frame_1(#k_seq{arg=A0,body=B0}=Seq) -> - A = avoid_stack_frame_1(A0), - B = avoid_stack_frame_1(B0), - Seq#k_seq{arg=A,body=B}; -avoid_stack_frame_1(#k_test{}=Test) -> - Test; -avoid_stack_frame_1(#k_type_clause{values=Values0}=TC) -> - Values = avoid_stack_frame_list(Values0), - TC#k_type_clause{values=Values}; -avoid_stack_frame_1(#k_val_clause{body=B0}=VC) -> - B = avoid_stack_frame_1(B0), - VC#k_val_clause{body=B}; -avoid_stack_frame_1(_Body) -> - throw(impossible). - -avoid_stack_frame_list([H|T]) -> - [avoid_stack_frame_1(H)|avoid_stack_frame_list(T)]; -avoid_stack_frame_list([]) -> []. - - -%% This pass creates beam format annotated with variable lifetime -%% information. Each thing is given an index and for each variable we -%% store the first and last index for its occurrence. The variable -%% database, VDB, attached to each thing is only relevant internally -%% for that thing. -%% -%% For nested things like matches the numbering continues locally and -%% the VDB for that thing refers to the variable usage within that -%% thing. Variables which live through a such a thing are internally -%% given a very large last index. Internally the indexes continue -%% after the index of that thing. This creates no problems as the -%% internal variable info never escapes and externally we only see -%% variable which are alive both before or after. -%% -%% This means that variables never "escape" from a thing and the only -%% way to get values from a thing is to "return" them, with 'break' or -%% 'return'. Externally these values become the return values of the -%% thing. This is no real limitation as most nested things have -%% multiple threads so working out a common best variable usage is -%% difficult. - -%% body(Kbody, I, Vdb) -> {[Expr],MaxI,Vdb}. -%% Handle a body. - -body(#k_seq{arg=Ke,body=Kb}, I, Vdb0) -> - %%ok = io:fwrite("life ~w:~p~n", [?LINE,{Ke,I,Vdb0}]), - A = get_kanno(Ke), - Vdb1 = use_vars(union(A#k.us, A#k.ns), I, Vdb0), - {Es,MaxI,Vdb2} = body(Kb, I+1, Vdb1), - E = expr(Ke, I, Vdb2), - {[E|Es],MaxI,Vdb2}; -body(Ke, I, Vdb0) -> - %%ok = io:fwrite("life ~w:~p~n", [?LINE,{Ke,I,Vdb0}]), - A = get_kanno(Ke), - Vdb1 = use_vars(union(A#k.us, A#k.ns), I, Vdb0), - E = expr(Ke, I, Vdb1), - {[E],I,Vdb1}. - -%% expr(Kexpr, I, Vdb) -> Expr. - -expr(#k_test{anno=A}=Test, I, _Vdb) -> - Test#k_test{anno=#l{i=I,a=A#k.a}}; -expr(#k_call{anno=A}=Call, I, _Vdb) -> - Call#k_call{anno=#l{i=I,a=A#k.a}}; -expr(#k_enter{anno=A}=Enter, I, _Vdb) -> - Enter#k_enter{anno=#l{i=I,a=A#k.a}}; -expr(#k_bif{anno=A}=Bif, I, _Vdb) -> - Bif#k_bif{anno=#l{i=I,a=A#k.a}}; -expr(#k_match{anno=A,body=Kb,ret=Rs}, I, Vdb) -> - %% Work out imported variables which need to be locked. - Mdb = vdb_sub(I, I+1, Vdb), - M = match(Kb, A#k.us, I+1, Mdb), - L = #l{i=I,vdb=use_vars(A#k.us, I+1, Mdb),a=A#k.a}, - #k_match{anno=L,body=M,ret=Rs}; -expr(#k_guard_match{anno=A,body=Kb,ret=Rs}, I, Vdb) -> - %% Work out imported variables which need to be locked. - Mdb = vdb_sub(I, I+1, Vdb), - M = match(Kb, A#k.us, I+1, Mdb), - L = #l{i=I,vdb=use_vars(A#k.us, I+1, Mdb),a=A#k.a}, - #k_guard_match{anno=L,body=M,ret=Rs}; -expr(#k_protected{}=Protected, I, Vdb) -> - protected(Protected, I, Vdb); -expr(#k_try{anno=A,arg=Ka,vars=Vs,body=Kb,evars=Evs,handler=Kh}=Try, I, Vdb) -> - %% Lock variables that are alive before the catch and used afterwards. - %% Don't lock variables that are only used inside the try. - Tdb0 = vdb_sub(I, I+1, Vdb), - %% This is the tricky bit. Lock variables in Arg that are used in - %% the body and handler. Add try tag 'variable'. - Ab = get_kanno(Kb), - Ah = get_kanno(Kh), - Tdb1 = use_vars(union(Ab#k.us, Ah#k.us), I+3, Tdb0), - Tdb2 = vdb_sub(I, I+2, Tdb1), - Vnames = fun (Kvar) -> Kvar#k_var.name end, %Get the variable names - {Aes,_,Adb} = body(Ka, I+2, add_var({catch_tag,I+1}, I+1, locked, Tdb2)), - {Bes,_,Bdb} = body(Kb, I+4, new_vars(sort(map(Vnames, Vs)), I+3, Tdb2)), - {Hes,_,Hdb} = body(Kh, I+4, new_vars(sort(map(Vnames, Evs)), I+3, Tdb2)), - L = #l{i=I,vdb=Tdb1,a=A#k.a}, - Try#k_try{anno=L, - arg=#cg_block{es=Aes,anno=#l{i=I+1,vdb=Adb,a=[]}}, - vars=Vs,body=#cg_block{es=Bes,anno=#l{i=I+3,vdb=Bdb,a=[]}}, - evars=Evs,handler=#cg_block{es=Hes,anno=#l{i=I+3,vdb=Hdb,a=[]}}}; -expr(#k_try_enter{anno=A,arg=Ka,vars=Vs,body=Kb,evars=Evs,handler=Kh}, I, Vdb) -> - %% Lock variables that are alive before the catch and used afterwards. - %% Don't lock variables that are only used inside the try. - Tdb0 = vdb_sub(I, I+1, Vdb), - %% This is the tricky bit. Lock variables in Arg that are used in - %% the body and handler. Add try tag 'variable'. - Ab = get_kanno(Kb), - Ah = get_kanno(Kh), - Tdb1 = use_vars(union(Ab#k.us, Ah#k.us), I+3, Tdb0), - Tdb2 = vdb_sub(I, I+2, Tdb1), - Vnames = fun (Kvar) -> Kvar#k_var.name end, %Get the variable names - {Aes,_,Adb} = body(Ka, I+2, add_var({catch_tag,I+1}, I+1, 1000000, Tdb2)), - {Bes,_,Bdb} = body(Kb, I+4, new_vars(sort(map(Vnames, Vs)), I+3, Tdb2)), - {Hes,_,Hdb} = body(Kh, I+4, new_vars(sort(map(Vnames, Evs)), I+3, Tdb2)), - L = #l{i=I,vdb=Tdb1,a=A#k.a}, - #k_try_enter{anno=L, - arg=#cg_block{es=Aes,anno=#l{i=I+1,vdb=Adb,a=[]}}, - vars=Vs,body=#cg_block{es=Bes,anno=#l{i=I+3,vdb=Bdb,a=[]}}, - evars=Evs,handler=#cg_block{es=Hes,anno=#l{i=I+3,vdb=Hdb,a=[]}}}; -expr(#k_catch{anno=A,body=Kb}=Catch, I, Vdb) -> - %% Lock variables that are alive before the catch and used afterwards. - %% Don't lock variables that are only used inside the catch. - %% Add catch tag 'variable'. - Cdb0 = vdb_sub(I, I+1, Vdb), - {Es,_,Cdb1} = body(Kb, I+1, add_var({catch_tag,I}, I, locked, Cdb0)), - L = #l{i=I,vdb=Cdb1,a=A#k.a}, - Catch#k_catch{anno=L,body=#cg_block{es=Es}}; -expr(#k_receive{anno=A,var=V,body=Kb,action=Ka}=Recv, I, Vdb) -> - %% Work out imported variables which need to be locked. - Rdb = vdb_sub(I, I+1, Vdb), - M = match(Kb, add_element(V#k_var.name, A#k.us), I+1, - new_vars([V#k_var.name], I, Rdb)), - {Tes,_,Adb} = body(Ka, I+1, Rdb), - Le = #l{i=I,vdb=use_vars(A#k.us, I+1, Vdb),a=A#k.a}, - Recv#k_receive{anno=Le,body=M, - action=#cg_block{anno=#l{i=I+1,vdb=Adb,a=[]},es=Tes}}; -expr(#k_receive_accept{anno=A}, I, _Vdb) -> - #k_receive_accept{anno=#l{i=I,a=A#k.a}}; -expr(#k_receive_next{anno=A}, I, _Vdb) -> - #k_receive_next{anno=#l{i=I,a=A#k.a}}; -expr(#k_put{anno=A}=Put, I, _Vdb) -> - Put#k_put{anno=#l{i=I,a=A#k.a}}; -expr(#k_break{anno=A}=Break, I, _Vdb) -> - Break#k_break{anno=#l{i=I,a=A#k.a}}; -expr(#k_guard_break{anno=A}=Break, I, _Vdb) -> - Break#k_guard_break{anno=#l{i=I,a=A#k.a}}; -expr(#k_return{anno=A}=Ret, I, _Vdb) -> - Ret#k_return{anno=#l{i=I,a=A#k.a}}. - -%% protected(Kprotected, I, Vdb) -> Protected. -%% Only used in guards. - -protected(#k_protected{anno=A,arg=Ts}=Prot, I, Vdb) -> - %% Lock variables that are alive before try and used afterwards. - %% Don't lock variables that are only used inside the protected - %% expression. - Pdb0 = vdb_sub(I, I+1, Vdb), - {T,MaxI,Pdb1} = body(Ts, I+1, Pdb0), - Pdb2 = use_vars(A#k.ns, MaxI+1, Pdb1), %Save "return" values - Prot#k_protected{arg=T,anno=#l{i=I,a=A#k.a,vdb=Pdb2}}. - -%% match(Kexpr, [LockVar], I, Vdb) -> Expr. -%% Convert match tree to old format. - -match(#k_alt{anno=A,first=Kf,then=Kt}, Ls, I, Vdb0) -> - Vdb1 = use_vars(union(A#k.us, Ls), I, Vdb0), - F = match(Kf, Ls, I+1, Vdb1), - T = match(Kt, Ls, I+1, Vdb1), - #k_alt{anno=[],first=F,then=T}; -match(#k_select{anno=A,types=Kts}=Select, Ls, I, Vdb0) -> - Vdb1 = use_vars(union(A#k.us, Ls), I, Vdb0), - Ts = [type_clause(Tc, Ls, I+1, Vdb1) || Tc <- Kts], - Select#k_select{anno=[],types=Ts}; -match(#k_guard{anno=A,clauses=Kcs}, Ls, I, Vdb0) -> - Vdb1 = use_vars(union(A#k.us, Ls), I, Vdb0), - Cs = [guard_clause(G, Ls, I+1, Vdb1) || G <- Kcs], - #k_guard{anno=[],clauses=Cs}; -match(Other, Ls, I, Vdb0) -> - Vdb1 = use_vars(Ls, I, Vdb0), - {B,_,Vdb2} = body(Other, I+1, Vdb1), - Le = #l{i=I,vdb=Vdb2,a=[]}, - #cg_block{anno=Le,es=B}. - -type_clause(#k_type_clause{anno=A,type=T,values=Kvs}, Ls, I, Vdb0) -> - %%ok = io:format("life ~w: ~p~n", [?LINE,{T,Kvs}]), - Vdb1 = use_vars(union(A#k.us, Ls), I+1, Vdb0), - Vs = [val_clause(Vc, Ls, I+1, Vdb1) || Vc <- Kvs], - #k_type_clause{anno=[],type=T,values=Vs}. - -val_clause(#k_val_clause{anno=A,val=V,body=Kb}, Ls0, I, Vdb0) -> - New = (get_kanno(V))#k.ns, - Bus = (get_kanno(Kb))#k.us, - %%ok = io:format("Ls0 = ~p, Used=~p\n New=~p, Bus=~p\n", [Ls0,Used,New,Bus]), - Ls1 = union(intersection(New, Bus), Ls0), %Lock for safety - Vdb1 = use_vars(union(A#k.us, Ls1), I+1, new_vars(New, I, Vdb0)), - B = match(Kb, Ls1, I+1, Vdb1), - Le = #l{i=I,vdb=use_vars(Bus, I+1, Vdb1),a=A#k.a}, - #k_val_clause{anno=Le,val=V,body=B}. - -guard_clause(#k_guard_clause{anno=A,guard=Kg,body=Kb}, Ls, I, Vdb0) -> - Vdb1 = use_vars(union(A#k.us, Ls), I+2, Vdb0), - Gdb = vdb_sub(I+1, I+2, Vdb1), - G = protected(Kg, I+1, Gdb), - B = match(Kb, Ls, I+2, Vdb1), - Le = #l{i=I,vdb=use_vars((get_kanno(Kg))#k.us, I+2, Vdb1),a=A#k.a}, - #k_guard_clause{anno=Le,guard=G,body=B}. - - -%% Here follows the code generator pass. -%% -%% The following assumptions have been made: -%% -%% 1. Matches, i.e. things with {match,M,Ret} wrappers, only return -%% values; no variables are exported. If the match would have returned -%% extra variables then these have been transformed to multiple return -%% values. -%% -%% 2. All BIF's called in guards are gc-safe so there is no need to -%% put thing on the stack in the guard. While this would in principle -%% work it would be difficult to keep track of the stack depth when -%% trimming. -%% -%% The code generation uses variable lifetime information added by -%% the previous pass to save variables, allocate registers and -%% move registers to the stack when necessary. -%% -%% We try to use a consistent variable name scheme throughout. The -%% StackReg record is always called Bef,Int,Aft. - -%% cg_fun([Lkexpr], [HeadVar], Vdb, State) -> {[Ainstr],State} - -cg_fun(Les, Hvs, Vdb, AtomMod, NameArity, Anno, St0) -> - {Fi,St1} = new_label(St0), %FuncInfo label - {Fl,St2} = local_func_label(NameArity, St1), - - %% - %% The pattern matching compiler (in v3_kernel) no longer - %% provides its own catch-all clause, because the - %% call to erlang:exit/1 caused problem when cases were - %% used in guards. Therefore, there may be tests that - %% cannot fail (providing that there is not a bug in a - %% previous optimzation pass), but still need to provide - %% a label (there are instructions, such as is_tuple/2, - %% that do not allow {f,0}). - %% - %% We will generate an ultimate failure label and put it - %% at the end of function, followed by an 'if_end' instruction. - %% Note that and 'if_end' instruction does not need any - %% live x registers, so it will always be safe to jump to - %% it. (We never ever expect the jump to be taken, and in - %% most functions there will never be any references to - %% the label in the first place.) - %% - - {UltimateMatchFail,St3} = new_label(St2), - - %% Create initial stack/register state, clear unused arguments. - Bef = clear_dead(#sr{reg=foldl(fun (#k_var{name=V}, Reg) -> - put_reg(V, Reg) - end, [], Hvs), - stk=[]}, 0, Vdb), - {B,_Aft,St} = cg_list(Les, Vdb, Bef, - St3#cg{bfail=0, - ultimate_failure=UltimateMatchFail, - is_top_block=true}), - {Name,Arity} = NameArity, - Asm = [{label,Fi},line(Anno),{func_info,AtomMod,{atom,Name},Arity}, - {label,Fl}|B++[{label,UltimateMatchFail},if_end]], - {Asm,Fl,St}. - -%% cg(Lkexpr, Vdb, StackReg, State) -> {[Ainstr],StackReg,State}. -%% Generate code for a kexpr. - -cg(#cg_block{anno=Le,es=Es}, Vdb, Bef, St) -> - block_cg(Es, Le, Vdb, Bef, St); -cg(#k_match{anno=Le,body=M,ret=Rs}, Vdb, Bef, St) -> - match_cg(M, Rs, Le, Vdb, Bef, St); -cg(#k_guard_match{anno=Le,body=M,ret=Rs}, Vdb, Bef, St) -> - guard_match_cg(M, Rs, Le, Vdb, Bef, St); -cg(#k_call{anno=Le,op=Func,args=As,ret=Rs}, Vdb, Bef, St) -> - call_cg(Func, As, Rs, Le, Vdb, Bef, St); -cg(#k_enter{anno=Le,op=Func,args=As}, Vdb, Bef, St) -> - enter_cg(Func, As, Le, Vdb, Bef, St); -cg(#k_bif{anno=Le}=Bif, Vdb, Bef, St) -> - bif_cg(Bif, Le, Vdb, Bef, St); -cg(#k_receive{anno=Le,timeout=Te,var=Rvar,body=Rm,action=Tes,ret=Rs}, - Vdb, Bef, St) -> - recv_loop_cg(Te, Rvar, Rm, Tes, Rs, Le, Vdb, Bef, St); -cg(#k_receive_next{anno=Le}, Vdb, Bef, St) -> - recv_next_cg(Le, Vdb, Bef, St); -cg(#k_receive_accept{}, _Vdb, Bef, St) -> - {[remove_message],Bef,St}; -cg(#k_try{anno=Le,arg=Ta,vars=Vs,body=Tb,evars=Evs,handler=Th,ret=Rs}, - Vdb, Bef, St) -> - try_cg(Ta, Vs, Tb, Evs, Th, Rs, Le, Vdb, Bef, St); -cg(#k_try_enter{anno=Le,arg=Ta,vars=Vs,body=Tb,evars=Evs,handler=Th}, - Vdb, Bef, St) -> - try_enter_cg(Ta, Vs, Tb, Evs, Th, Le, Vdb, Bef, St); -cg(#k_catch{anno=Le,body=Cb,ret=[R]}, Vdb, Bef, St) -> - catch_cg(Cb, R, Le, Vdb, Bef, St); -cg(#k_put{anno=Le,arg=Con,ret=Var}, Vdb, Bef, St) -> - put_cg(Var, Con, Le, Vdb, Bef, St); -cg(#k_return{anno=Le,args=Rs}, Vdb, Bef, St) -> - return_cg(Rs, Le, Vdb, Bef, St); -cg(#k_break{anno=Le,args=Bs}, Vdb, Bef, St) -> - break_cg(Bs, Le, Vdb, Bef, St); -cg(#k_guard_break{anno=Le,args=Bs}, Vdb, Bef, St) -> - guard_break_cg(Bs, Le, Vdb, Bef, St); -cg(#cg_need_heap{h=H}, _Vdb, Bef, St) -> - {[{test_heap,H,max_reg(Bef#sr.reg)}],Bef,St}. - -%% cg_list([Kexpr], FirstI, Vdb, StackReg, St) -> {[Ainstr],StackReg,St}. - -cg_list(Kes, Vdb, Bef, St0) -> - {Keis,{Aft,St1}} = - flatmapfoldl(fun (Ke, {Inta,Sta}) -> - {Keis,Intb,Stb} = cg(Ke, Vdb, Inta, Sta), - {Keis,{Intb,Stb}} - end, {Bef,St0}, need_heap(Kes)), - {Keis,Aft,St1}. - -%% need_heap([Lkexpr], I, St) -> [Lkexpr]. -%% Insert need_heap instructions in Kexpr list. Try to be smart and -%% collect them together as much as possible. - -need_heap(Kes0) -> - {Kes,H} = need_heap_0(reverse(Kes0), 0, []), - - %% Prepend need_heap if necessary. - need_heap_need(H) ++ Kes. - -need_heap_0([Ke|Kes], H0, Acc) -> - {Ns,H} = need_heap_1(Ke, H0), - need_heap_0(Kes, H, [Ke|Ns]++Acc); -need_heap_0([], H, Acc) -> - {Acc,H}. - -need_heap_1(#k_put{arg=#k_binary{}}, H) -> - {need_heap_need(H),0}; -need_heap_1(#k_put{arg=#k_map{}}, H) -> - {need_heap_need(H),0}; -need_heap_1(#k_put{arg=Val}, H) -> - %% Just pass through adding to needed heap. - {[],H + case Val of - #k_cons{} -> 2; - #k_tuple{es=Es} -> 1 + length(Es); - _Other -> 0 - end}; -need_heap_1(#k_bif{}=Bif, H) -> - case is_gc_bif(Bif) of - false -> - {[],H}; - true -> - {need_heap_need(H),0} - end; -need_heap_1(_Ke, H) -> - %% Call or call-like instruction such as set_tuple_element/3. - {need_heap_need(H),0}. - -need_heap_need(0) -> []; -need_heap_need(H) -> [#cg_need_heap{h=H}]. - -%% is_gc_bif(#k_bif{}) -> true|false. -%% is_gc_bif(Name, Arity) -> true|false. -%% Determines whether the BIF Name/Arity might do a GC. - -is_gc_bif(#k_bif{op=#k_remote{name=#k_atom{val=Name}},args=Args}) -> - is_gc_bif(Name, length(Args)); -is_gc_bif(#k_bif{op=#k_internal{}}) -> - true. - -is_gc_bif(hd, 1) -> false; -is_gc_bif(tl, 1) -> false; -is_gc_bif(self, 0) -> false; -is_gc_bif(node, 0) -> false; -is_gc_bif(node, 1) -> false; -is_gc_bif(element, 2) -> false; -is_gc_bif(get, 1) -> false; -is_gc_bif(tuple_size, 1) -> false; -is_gc_bif(map_get, 2) -> false; -is_gc_bif(is_map_key, 2) -> false; -is_gc_bif(Bif, Arity) -> - not (erl_internal:bool_op(Bif, Arity) orelse - erl_internal:new_type_test(Bif, Arity) orelse - erl_internal:comp_op(Bif, Arity)). - -%% match_cg(Matc, [Ret], Le, Vdb, StackReg, State) -> -%% {[Ainstr],StackReg,State}. -%% Generate code for a match. First save all variables on the stack -%% that are to survive after the match. We leave saved variables in -%% their registers as they might actually be in the right place. - -match_cg(M, Rs, Le, Vdb, Bef, St0) -> - I = Le#l.i, - {Sis,Int0} = adjust_stack(Bef, I, I+1, Vdb), - {B,St1} = new_label(St0), - {Mis,Int1,St2} = match_cg(M, St1#cg.ultimate_failure, - Int0, St1#cg{break=B}), - %% Put return values in registers. - Reg = load_vars(Rs, Int1#sr.reg), - {Sis ++ Mis ++ [{label,B}], - clear_dead(Int1#sr{reg=Reg}, I, Vdb), - St2#cg{break=St1#cg.break}}. - -guard_match_cg(M, Rs, Le, Vdb, Bef, St0) -> - I = Le#l.i, - {B,St1} = new_label(St0), - Fail = case St0 of - #cg{bfail=0,ultimate_failure=Fail0} -> Fail0; - #cg{bfail=Fail0} -> Fail0 - end, - {Mis,Aft,St2} = match_cg(M, Fail, Bef, St1#cg{break=B}), - %% Update the register descriptors for the return registers. - Reg = guard_match_regs(Aft#sr.reg, Rs), - {Mis ++ [{label,B}], - clear_dead(Aft#sr{reg=Reg}, I, Vdb), - St2#cg{break=St1#cg.break}}. - -guard_match_regs([{I,gbreakvar}|Rs], [#k_var{name=V}|Vs]) -> - [{I,V}|guard_match_regs(Rs, Vs)]; -guard_match_regs([R|Rs], Vs) -> - [R|guard_match_regs(Rs, Vs)]; -guard_match_regs([], []) -> []. - - -%% match_cg(Match, Fail, StackReg, State) -> {[Ainstr],StackReg,State}. -%% Generate code for a match tree. N.B. there is no need pass Vdb -%% down as each level which uses this takes its own internal Vdb not -%% the outer one. - -match_cg(#k_alt{first=F,then=S}, Fail, Bef, St0) -> - {Tf,St1} = new_label(St0), - {Fis,Faft,St2} = match_cg(F, Tf, Bef, St1), - {Sis,Saft,St3} = match_cg(S, Fail, Bef, St2), - Aft = sr_merge(Faft, Saft), - {Fis ++ [{label,Tf}] ++ Sis,Aft,St3}; -match_cg(#k_select{var=#k_var{anno=Vanno,name=Vname}=V,types=Scs0}, Fail, Bef, St) -> - ReuseForContext = member(reuse_for_context, Vanno) andalso - find_reg(Vname, Bef#sr.reg) =/= error, - Scs = case ReuseForContext of - false -> Scs0; - true -> bsm_rename_ctx(Scs0, Vname) - end, - match_fmf(fun (S, F, Sta) -> - select_cg(S, V, F, Fail, Bef, Sta) end, - Fail, St, Scs); -match_cg(#k_guard{clauses=Gcs}, Fail, Bef, St) -> - match_fmf(fun (G, F, Sta) -> guard_clause_cg(G, F, Bef, Sta) end, - Fail, St, Gcs); -match_cg(#cg_block{anno=Le,es=Es}, _Fail, Bef, St) -> - %% Must clear registers and stack of dead variables. - Int = clear_dead(Bef, Le#l.i, Le#l.vdb), - block_cg(Es, Le, Int, St). - -%% bsm_rename_ctx([Clause], Var) -> [Clause] -%% We know from an annotation that the register for a binary can -%% be reused for the match context because the two are not truly -%% alive at the same time (even though the life time information -%% says so). -%% -%% The easiest way to have those variables share the same register is -%% to rename the variable with the shortest life-span (the match -%% context) to the variable for the binary (which can have a very -%% long life-time because it is locked during matching). We KNOW that -%% the match state variable will only be alive during the matching. -%% -%% We must also remove all information about the match context -%% variable from all life-time information databases (Vdb). - -bsm_rename_ctx([#k_type_clause{type=k_binary,values=Vcs}=TC|Cs], New) -> - [#k_val_clause{val=#k_binary{segs=#k_var{name=Old}}=Bin, - body=Ke0}=VC0] = Vcs, - Ke = bsm_rename_ctx(Ke0, Old, New, false), - VC = VC0#k_val_clause{val=Bin#k_binary{segs=#k_var{name=New}}, - body=Ke}, - [TC#k_type_clause{values=[VC]}|bsm_rename_ctx(Cs, New)]; -bsm_rename_ctx([C|Cs], New) -> - [C|bsm_rename_ctx(Cs, New)]; -bsm_rename_ctx([], _) -> []. - -%% bsm_rename_ctx(Ke, OldName, NewName, InProt) -> Ke' -%% Rename and clear OldName from life-time information. We must -%% recurse into any block contained in a protected, but it would -%% only complicatate things to recurse into blocks not in a protected -%% (the match context variable is not live inside them). - -bsm_rename_ctx(#k_select{var=#k_var{name=V},types=Cs0}=Sel, - Old, New, InProt) -> - Cs = bsm_rename_ctx_list(Cs0, Old, New, InProt), - Sel#k_select{var=#k_var{name=bsm_rename_var(V, Old, New)},types=Cs}; -bsm_rename_ctx(#k_type_clause{values=Cs0}=TC, Old, New, InProt) -> - Cs = bsm_rename_ctx_list(Cs0, Old, New, InProt), - TC#k_type_clause{values=Cs}; -bsm_rename_ctx(#k_val_clause{body=Ke0}=VC, Old, New, InProt) -> - Ke = bsm_rename_ctx(Ke0, Old, New, InProt), - VC#k_val_clause{body=Ke}; -bsm_rename_ctx(#k_alt{first=F0,then=S0}=Alt, Old, New, InProt) -> - F = bsm_rename_ctx(F0, Old, New, InProt), - S = bsm_rename_ctx(S0, Old, New, InProt), - Alt#k_alt{first=F,then=S}; -bsm_rename_ctx(#k_guard{clauses=Gcs0}=Guard, Old, New, InProt) -> - Gcs = bsm_rename_ctx_list(Gcs0, Old, New, InProt), - Guard#k_guard{clauses=Gcs}; -bsm_rename_ctx(#k_guard_clause{guard=G0,body=B0}=GC, Old, New, InProt) -> - G = bsm_rename_ctx(G0, Old, New, InProt), - B = bsm_rename_ctx(B0, Old, New, InProt), - %% A guard clause may cause unsaved variables to be saved on the stack. - %% Since the match state variable Old is an alias for New (uses the - %% same register), it is neither in the stack nor register descriptor - %% lists and we would crash when we didn't find it unless we remove - %% it from the database. - bsm_forget_var(GC#k_guard_clause{guard=G,body=B}, Old); -bsm_rename_ctx(#k_protected{arg=Ts0}=Prot, Old, New, _InProt) -> - InProt = true, - Ts = bsm_rename_ctx_list(Ts0, Old, New, InProt), - bsm_forget_var(Prot#k_protected{arg=Ts}, Old); -bsm_rename_ctx(#k_guard_match{body=Ms0}=Match, Old, New, InProt) -> - Ms = bsm_rename_ctx(Ms0, Old, New, InProt), - Match#k_guard_match{body=Ms}; -bsm_rename_ctx(#k_test{}=Test, _, _, _) -> Test; -bsm_rename_ctx(#k_bif{}=Bif, _, _, _) -> Bif; -bsm_rename_ctx(#k_put{}=Put, _, _, _) -> Put; -bsm_rename_ctx(#k_call{}=Call, _, _, _) -> Call; -bsm_rename_ctx(#cg_block{}=Block, Old, _, false) -> - %% This block is not inside a protected. The match context variable cannot - %% possibly be live inside the block. - bsm_forget_var(Block, Old); -bsm_rename_ctx(#cg_block{es=Es0}=Block, Old, New, true) -> - %% A block in a protected. We must recursively rename the variable - %% inside the block. - Es = bsm_rename_ctx_list(Es0, Old, New, true), - bsm_forget_var(Block#cg_block{es=Es}, Old); -bsm_rename_ctx(#k_guard_break{}=Break, Old, _New, _InProt) -> - bsm_forget_var(Break, Old). - -bsm_rename_ctx_list([C|Cs], Old, New, InProt) -> - [bsm_rename_ctx(C, Old, New, InProt)| - bsm_rename_ctx_list(Cs, Old, New, InProt)]; -bsm_rename_ctx_list([], _, _, _) -> []. - -bsm_rename_var(Old, Old, New) -> New; -bsm_rename_var(V, _, _) -> V. - -%% bsm_forget_var(#l{}, Variable) -> #l{} -%% Remove a variable from the variable life-time database. - -bsm_forget_var(Ke, V) -> - #l{vdb=Vdb} = L0 = get_kanno(Ke), - L = L0#l{vdb=keydelete(V, 1, Vdb)}, - set_kanno(Ke, L). - -%% block_cg([Kexpr], Le, Vdb, StackReg, St) -> {[Ainstr],StackReg,St}. -%% block_cg([Kexpr], Le, StackReg, St) -> {[Ainstr],StackReg,St}. - -block_cg(Es, Le, _Vdb, Bef, St) -> - block_cg(Es, Le, Bef, St). - -block_cg(Es, Le, Bef, #cg{is_top_block=false}=St) -> - cg_block(Es, Le#l.vdb, Bef, St); -block_cg(Es, Le, Bef, #cg{is_top_block=true}=St0) -> - %% No stack frame has been established yet. Do we need one? - case need_stackframe(Es) of - true -> - %% We need a stack frame. Generate the code and add the - %% code for creating and deallocating the stack frame. - {Is0,Aft,St} = cg_block(Es, Le#l.vdb, Bef, - St0#cg{is_top_block=false,need_frame=false}), - Is = top_level_block(Is0, Aft, max_reg(Bef#sr.reg), St), - {Is,Aft,St#cg{is_top_block=true}}; - false -> - %% This sequence of instructions ending in a #k_match{} (a - %% 'case' or 'if') in the Erlang code does not need a - %% stack frame yet. Delay the creation (if a stack frame - %% is needed at all, it will be created inside the - %% #k_match{}). - cg_list(Es, Le#l.vdb, Bef, St0) - end. - -%% need_stackframe([Kexpr]) -> true|false. -%% Does this list of instructions need a stack frame? -%% -%% A sequence of instructions that don't clobber the X registers -%% followed by a single #k_match{} doesn't need a stack frame. - -need_stackframe([H|T]) -> - case H of - #k_bif{op=#k_internal{}} -> true; - #k_put{arg=#k_binary{}} -> true; - #k_bif{} -> need_stackframe(T); - #k_put{} -> need_stackframe(T); - #k_guard_match{} -> need_stackframe(T); - #k_match{} when T =:= [] -> false; - _ -> true - end; -need_stackframe([]) -> false. - -cg_block([], _Vdb, Bef, St0) -> - {[],Bef,St0}; -cg_block(Kes0, Vdb, Bef, St0) -> - {Kes2,Int1,St1} = - case basic_block(Kes0) of - {Kes1,LastI,Args,Rest} -> - cg_basic_block(Kes1, LastI, Args, Vdb, Bef, St0); - {Kes1,Rest} -> - cg_list(Kes1, Vdb, Bef, St0) - end, - {Kes3,Int2,St2} = cg_block(Rest, Vdb, Int1, St1), - {Kes2 ++ Kes3,Int2,St2}. - -basic_block(Kes) -> basic_block(Kes, []). - -basic_block([Ke|Kes], Acc) -> - case collect_block(Ke) of - include -> basic_block(Kes, [Ke|Acc]); - {block_end,As} -> - case Acc of - [] -> - %% If the basic block does not contain any #k_put{} instructions, - %% it serves no useful purpose to do basic block optimizations. - {[Ke],Kes}; - _ -> - #l{i=I} = get_kanno(Ke), - {reverse(Acc, [Ke]),I,As,Kes} - end; - no_block -> {reverse(Acc, [Ke]),Kes} - end. - -collect_block(#k_put{arg=Arg}) -> - %% #k_put{} instructions that may garbage collect are not allowed - %% in basic blocks. - case Arg of - #k_binary{} -> no_block; - #k_map{} -> no_block; - _ -> include - end; -collect_block(#k_call{op=Func,args=As}) -> - {block_end,As++func_vars(Func)}; -collect_block(#k_enter{op=Func,args=As}) -> - {block_end,As++func_vars(Func)}; -collect_block(#k_return{args=Rs}) -> - {block_end,Rs}; -collect_block(#k_break{args=Bs}) -> - {block_end,Bs}; -collect_block(_) -> no_block. - -func_vars(#k_var{}=Var) -> - [Var]; -func_vars(#k_remote{mod=M,name=F}) - when is_record(M, k_var); is_record(F, k_var) -> - [M,F]; -func_vars(_) -> []. - -%% cg_basic_block([Kexpr], FirstI, LastI, Arguments, Vdb, StackReg, State) -> -%% {[Ainstr],StackReg,State}. -%% -%% Do a specialized code generation for a basic block of #put{} -%% instructions (that don't do any garbage collection) followed by a -%% call, break, or return. -%% -%% 'Arguments' is a list of the variables that must be loaded into -%% consecutive X registers before the last instruction in the block. -%% The point of this specialized code generation is to try put the -%% all of the variables in 'Arguments' into the correct X register -%% to begin with, instead of putting them into the first available -%% X register and having to move them to the correct X register -%% later. -%% -%% To achieve that, we attempt to reserve the X registers that the -%% variables in 'Arguments' will need to be in when the block ends. -%% -%% To make it more likely that reservations will be successful, we -%% will try to save variables that need to be saved to the stack as -%% early as possible (if an X register needed by a variable in -%% Arguments is occupied by another variable, the value in the -%% X register can be evicted if it is saved on the stack). -%% -%% We will take care not to increase the size of stack frame compared -%% to what the standard code generator would have done (that is, to -%% save all X registers at the last possible moment). We will do that -%% by extending the stack frame to the minimal size needed to save -%% all that needs to be saved using extend_stack/4, and use -%% save_carefully/4 during code generation to only save the variables -%% that can be saved without growing the stack frame. - -cg_basic_block(Kes, Lf, As, Vdb, Bef, St0) -> - Int0 = reserve_arg_regs(As, Bef), - Int = extend_stack(Int0, Lf, Lf+1, Vdb), - {Keis,{Aft,St1}} = - flatmapfoldl(fun(Ke, St) -> cg_basic_block(Ke, St, Lf, Vdb) end, - {Int,St0}, need_heap(Kes)), - {Keis,Aft,St1}. - -cg_basic_block(#cg_need_heap{}=Ke, {Bef,St0}, _Lf, Vdb) -> - {Keis,Aft,St1} = cg(Ke, Vdb, Bef, St0), - {Keis,{Aft,St1}}; -cg_basic_block(Ke, {Bef,St0}, Lf, Vdb) -> - #l{i=I} = get_kanno(Ke), - - %% Save all we can to increase the possibility that reserving - %% registers will succeed. - {Sis,Int0} = save_carefully(Bef, I, Lf+1, Vdb), - Int1 = reserve(Int0), - {Keis,Aft,St1} = cg(Ke, Vdb, Int1, St0), - {Sis ++ Keis,{Aft,St1}}. - -%% reserve_arg_regs([Argument], Bef) -> Aft. -%% Try to reserve the X registers for all arguments. All registers -%% that we wish to reserve will be saved in Bef#sr.res. - -reserve_arg_regs(As, Bef) -> - Res = reserve_arg_regs_1(As, 0), - reserve(Bef#sr{res=Res}). - -reserve_arg_regs_1([#k_var{name=V}|As], I) -> - [{I,V}|reserve_arg_regs_1(As, I+1)]; -reserve_arg_regs_1([A|As], I) -> - [{I,A}|reserve_arg_regs_1(As, I+1)]; -reserve_arg_regs_1([], _) -> []. - -%% reserve(Bef) -> Aft. -%% Try to reserve more registers. The registers we wish to reserve -%% are found in Bef#sr.res. - -reserve(#sr{reg=Regs,stk=Stk,res=Res}=Sr) -> - Sr#sr{reg=reserve_1(Res, Regs, Stk)}. - -reserve_1([{I,V}|Rs], [free|Regs], Stk) -> - [{reserved,I,V}|reserve_1(Rs, Regs, Stk)]; -reserve_1([{I,V}|Rs], [{I,V}|Regs], Stk) -> - [{I,V}|reserve_1(Rs, Regs, Stk)]; -reserve_1([{I,V}|Rs], [{I,Var}|Regs], Stk) -> - case on_stack(Var, Stk) of - true -> [{reserved,I,V}|reserve_1(Rs, Regs, Stk)]; - false -> [{I,Var}|reserve_1(Rs, Regs, Stk)] - end; -reserve_1([{I,V}|Rs], [{reserved,I,_}|Regs], Stk) -> - [{reserved,I,V}|reserve_1(Rs, Regs, Stk)]; -reserve_1([{I,V}|Rs], [], Stk) -> - [{reserved,I,V}|reserve_1(Rs, [], Stk)]; -reserve_1([], Regs, _) -> Regs. - -%% extend_stack(Bef, FirstBefore, LastFrom, Vdb) -> Aft. -%% Extend the stack enough to fit all variables alive past LastFrom -%% and not already on the stack. - -extend_stack(#sr{stk=Stk0}=Bef, Fb, Lf, Vdb) -> - Stk1 = clear_dead_stk(Stk0, Fb, Vdb), - New = new_not_on_stack(Stk1, Fb, Lf, Vdb), - Stk2 = foldl(fun ({V,_,_}, Stk) -> put_stack(V, Stk) end, Stk1, New), - Stk = Stk0 ++ lists:duplicate(length(Stk2) - length(Stk0), free), - Bef#sr{stk=Stk}. - -%% save_carefully(Bef, FirstBefore, LastFrom, Vdb) -> {[SaveVar],Aft}. -%% Save variables which are used past current point and which are not -%% already on the stack, but only if the variables can be saved without -%% growing the stack frame. - -save_carefully(#sr{stk=Stk}=Bef, Fb, Lf, Vdb) -> - New0 = new_not_on_stack(Stk, Fb, Lf, Vdb), - New = keysort(2, New0), - save_carefully_1(New, Bef, []). - -save_carefully_1([{V,_,_}|Vs], #sr{reg=Regs,stk=Stk0}=Bef, Acc) -> - case put_stack_carefully(V, Stk0) of - error -> - {reverse(Acc),Bef}; - Stk1 -> - SrcReg = fetch_reg(V, Regs), - Move = {move,SrcReg,fetch_stack(V, Stk1)}, - {x,_} = SrcReg, %Assertion - must be X register. - save_carefully_1(Vs, Bef#sr{stk=Stk1}, [Move|Acc]) - end; -save_carefully_1([], Bef, Acc) -> - {reverse(Acc),Bef}. - -%% top_level_block([Instruction], Bef, MaxRegs, St) -> [Instruction]. -%% For the top-level block, allocate a stack frame a necessary, -%% adjust Y register numbering and instructions that return -%% from the function. - -top_level_block(Keis, #sr{stk=[]}, _MaxRegs, #cg{need_frame=false}) -> - Keis; -top_level_block(Keis, Bef, MaxRegs, _St) -> - %% This top block needs an allocate instruction before it, and a - %% deallocate instruction before each return. - FrameSz = length(Bef#sr.stk), - MaxY = FrameSz-1, - Keis1 = flatmap(fun ({call_only,Arity,Func}) -> - [{call_last,Arity,Func,FrameSz}]; - ({call_ext_only,Arity,Func}) -> - [{call_ext_last,Arity,Func,FrameSz}]; - ({apply_only,Arity}) -> - [{apply_last,Arity,FrameSz}]; - (return) -> - [{deallocate,FrameSz},return]; - (Tuple) when is_tuple(Tuple) -> - [turn_yregs(Tuple, MaxY)]; - (Other) -> - [Other] - end, Keis), - [{allocate_zero,FrameSz,MaxRegs}|Keis1]. - -%% turn_yregs(Size, Tuple, MaxY) -> Tuple' -%% Renumber y register so that {y,0} becomes {y,FrameSize-1}, -%% {y,FrameSize-1} becomes {y,0} and so on. This is to make nested -%% catches work. The code generation algorithm gives a lower register -%% number to the outer catch, which is wrong. - -turn_yregs({call,_,_}=I, _MaxY) -> I; -turn_yregs({call_ext,_,_}=I, _MaxY) -> I; -turn_yregs({jump,_}=I, _MaxY) -> I; -turn_yregs({label,_}=I, _MaxY) -> I; -turn_yregs({line,_}=I, _MaxY) -> I; -turn_yregs({test_heap,_,_}=I, _MaxY) -> I; -turn_yregs({bif,Op,F,A,B}, MaxY) -> - {bif,Op,F,turn_yreg(A, MaxY),turn_yreg(B, MaxY)}; -turn_yregs({gc_bif,Op,F,Live,A,B}, MaxY) when is_integer(Live) -> - {gc_bif,Op,F,Live,turn_yreg(A, MaxY),turn_yreg(B, MaxY)}; -turn_yregs({get_tuple_element,S,N,D}, MaxY) -> - {get_tuple_element,turn_yreg(S, MaxY),N,turn_yreg(D, MaxY)}; -turn_yregs({put_tuple,Arity,D}, MaxY) -> - {put_tuple,Arity,turn_yreg(D, MaxY)}; -turn_yregs({select_val,R,F,L}, MaxY) -> - {select_val,turn_yreg(R, MaxY),F,L}; -turn_yregs({test,Op,F,L}, MaxY) -> - {test,Op,F,turn_yreg(L, MaxY)}; -turn_yregs({test,Op,F,Live,A,B}, MaxY) when is_integer(Live) -> - {test,Op,F,Live,turn_yreg(A, MaxY),turn_yreg(B, MaxY)}; -turn_yregs({Op,A}, MaxY) -> - {Op,turn_yreg(A, MaxY)}; -turn_yregs({Op,A,B}, MaxY) -> - {Op,turn_yreg(A, MaxY),turn_yreg(B, MaxY)}; -turn_yregs({Op,A,B,C}, MaxY) -> - {Op,turn_yreg(A, MaxY),turn_yreg(B, MaxY),turn_yreg(C, MaxY)}; -turn_yregs(Tuple, MaxY) -> - turn_yregs(tuple_size(Tuple), Tuple, MaxY). - -turn_yregs(1, Tp, _) -> - Tp; -turn_yregs(N, Tp, MaxY) -> - E = turn_yreg(element(N, Tp), MaxY), - turn_yregs(N-1, setelement(N, Tp, E), MaxY). - -turn_yreg({yy,YY}, MaxY) -> - {y,MaxY-YY}; -turn_yreg({list,Ls},MaxY) -> - {list,turn_yreg(Ls, MaxY)}; -turn_yreg([_|_]=Ts, MaxY) -> - [turn_yreg(T, MaxY) || T <- Ts]; -turn_yreg(Other, _MaxY) -> - Other. - -%% select_cg(Sclause, V, TypeFail, ValueFail, StackReg, State) -> -%% {Is,StackReg,State}. -%% Selecting type and value needs two failure labels, TypeFail is the -%% label to jump to of the next type test when this type fails, and -%% ValueFail is the label when this type is correct but the value is -%% wrong. These are different as in the second case there is no need -%% to try the next type, it will always fail. - -select_cg(#k_type_clause{type=Type,values=Vs}, Var, Tf, Vf, Bef, St) -> - #k_var{name=V} = Var, - select_cg(Type, Vs, V, Tf, Vf, Bef, St). - -select_cg(k_cons, [S], V, Tf, Vf, Bef, St) -> - select_cons(S, V, Tf, Vf, Bef, St); -select_cg(k_nil, [S], V, Tf, Vf, Bef, St) -> - select_nil(S, V, Tf, Vf, Bef, St); -select_cg(k_binary, [S], V, Tf, Vf, Bef, St) -> - select_binary(S, V, Tf, Vf, Bef, St); -select_cg(k_bin_seg, S, V, Tf, _Vf, Bef, St) -> - select_bin_segs(S, V, Tf, Bef, St); -select_cg(k_bin_int, S, V, Tf, _Vf, Bef, St) -> - select_bin_segs(S, V, Tf, Bef, St); -select_cg(k_bin_end, [S], V, Tf, _Vf, Bef, St) -> - select_bin_end(S, V, Tf, Bef, St); -select_cg(k_map, S, V, Tf, Vf, Bef, St) -> - select_map(S, V, Tf, Vf, Bef, St); -select_cg(k_literal, S, V, Tf, Vf, Bef, St) -> - select_literal(S, V, Tf, Vf, Bef, St); -select_cg(Type, Scs, V, Tf, Vf, Bef, St0) -> - {Vis,{Aft,St1}} = - mapfoldl(fun (S, {Int,Sta}) -> - {Val,Is,Inta,Stb} = select_val(S, V, Vf, Bef, Sta), - {{Is,[Val]},{sr_merge(Int, Inta),Stb}} - end, {void,St0}, Scs), - OptVls = combine(lists:sort(combine(Vis))), - {Vls,Sis,St2} = select_labels(OptVls, St1, [], []), - {select_val_cg(Type, fetch_var(V, Bef), Vls, Tf, Vf, Sis), Aft, St2}. - -select_val_cg(k_tuple, R, [Arity,{f,Lbl}], Tf, Vf, [{label,Lbl}|Sis]) -> - [{test,is_tuple,{f,Tf},[R]},{test,test_arity,{f,Vf},[R,Arity]}|Sis]; -select_val_cg(k_tuple, R, Vls, Tf, Vf, Sis) -> - [{test,is_tuple,{f,Tf},[R]},{select_tuple_arity,R,{f,Vf},{list,Vls}}|Sis]; -select_val_cg(Type, R, [Val, {f,Lbl}], Fail, Fail, [{label,Lbl}|Sis]) -> - [{test,is_eq_exact,{f,Fail},[R,{type(Type),Val}]}|Sis]; -select_val_cg(Type, R, [Val, {f,Lbl}], Tf, Vf, [{label,Lbl}|Sis]) -> - [{test,select_type_test(Type),{f,Tf},[R]}, - {test,is_eq_exact,{f,Vf},[R,{type(Type),Val}]}|Sis]; -select_val_cg(Type, R, Vls0, Tf, Vf, Sis) -> - Vls1 = [case Value of - {f,_Lbl} -> Value; - _ -> {type(Type),Value} - end || Value <- Vls0], - [{test,select_type_test(Type),{f,Tf},[R]}, {select_val,R,{f,Vf},{list,Vls1}}|Sis]. - -type(k_atom) -> atom; -type(k_float) -> float; -type(k_int) -> integer. - -select_type_test(k_int) -> is_integer; -select_type_test(k_atom) -> is_atom; -select_type_test(k_float) -> is_float. - -combine([{Is,Vs1}, {Is,Vs2}|Vis]) -> combine([{Is,Vs1 ++ Vs2}|Vis]); -combine([V|Vis]) -> [V|combine(Vis)]; -combine([]) -> []. - -select_labels([{Is,Vs}|Vis], St0, Vls, Sis) -> - {Lbl,St1} = new_label(St0), - select_labels(Vis, St1, add_vls(Vs, Lbl, Vls), [[{label,Lbl}|Is]|Sis]); -select_labels([], St, Vls, Sis) -> - {Vls,append(Sis),St}. - -add_vls([V|Vs], Lbl, Acc) -> - add_vls(Vs, Lbl, [V, {f,Lbl}|Acc]); -add_vls([], _, Acc) -> Acc. - -select_literal(S, V, Tf, Vf, Bef, St) -> - Reg = fetch_var(V, Bef), - F = fun(ValClause, Fail, St0) -> - {Val,Is,Aft,St1} = select_val(ValClause, V, Vf, Bef, St0), - Test = {test,is_eq_exact,{f,Fail},[Reg,{literal,Val}]}, - {[Test|Is],Aft,St1} - end, - match_fmf(F, Tf, St, S). - -select_cons(#k_val_clause{val=#k_cons{hd=Hd,tl=Tl},body=B,anno=#l{i=I,vdb=Vdb}}, - V, Tf, Vf, Bef, St0) -> - Es = [Hd,Tl], - {Eis,Int,St1} = select_extract_cons(V, Es, I, Vdb, Bef, St0), - {Bis,Aft,St2} = match_cg(B, Vf, Int, St1), - {[{test,is_nonempty_list,{f,Tf},[fetch_var(V, Bef)]}] ++ Eis ++ Bis,Aft,St2}. - -select_nil(#k_val_clause{val=#k_nil{},body=B}, V, Tf, Vf, Bef, St0) -> - {Bis,Aft,St1} = match_cg(B, Vf, Bef, St0), - {[{test,is_nil,{f,Tf},[fetch_var(V, Bef)]}] ++ Bis,Aft,St1}. - -select_binary(#k_val_clause{val=#k_binary{segs=#k_var{name=V}},body=B, - anno=#l{i=I,vdb=Vdb}}, V, Tf, Vf, Bef, St0) -> - #cg{ctx=OldCtx} = St0, - Int0 = clear_dead(Bef#sr{reg=Bef#sr.reg}, I, Vdb), - {Bis0,Aft,St1} = match_cg(B, Vf, Int0, St0#cg{ctx=V}), - CtxReg = fetch_var(V, Int0), - Live = max_reg(Bef#sr.reg), - Bis1 = [{test,bs_start_match2,{f,Tf},Live,[CtxReg,{context,V}],CtxReg}, - {bs_save2,CtxReg,{V,V}}|Bis0], - Bis = finish_select_binary(Bis1), - {Bis,Aft,St1#cg{ctx=OldCtx}}; -select_binary(#k_val_clause{val=#k_binary{segs=#k_var{name=Ivar}},body=B, - anno=#l{i=I,vdb=Vdb}}, V, Tf, Vf, Bef, St0) -> - #cg{ctx=OldCtx} = St0, - Regs = put_reg(Ivar, Bef#sr.reg), - Int0 = clear_dead(Bef#sr{reg=Regs}, I, Vdb), - {Bis0,Aft,St1} = match_cg(B, Vf, Int0, St0#cg{ctx=Ivar}), - CtxReg = fetch_var(Ivar, Int0), - Live = max_reg(Bef#sr.reg), - Bis1 = [{test,bs_start_match2,{f,Tf},Live, - [fetch_var(V, Bef),{context,Ivar}],CtxReg}, - {bs_save2,CtxReg,{Ivar,Ivar}}|Bis0], - Bis = finish_select_binary(Bis1), - {Bis,Aft,St1#cg{ctx=OldCtx}}. - -finish_select_binary([{bs_save2,R,Point}=I,{bs_restore2,R,Point}|Is]) -> - [I|finish_select_binary(Is)]; -finish_select_binary([{bs_save2,R,Point}=I,{test,is_eq_exact,_,_}=Test, - {bs_restore2,R,Point}|Is]) -> - [I,Test|finish_select_binary(Is)]; -finish_select_binary([{test,bs_match_string,F,[Ctx,BinList]}|Is]) - when is_list(BinList) -> - I = {test,bs_match_string,F,[Ctx,list_to_bitstring(BinList)]}, - [I|finish_select_binary(Is)]; -finish_select_binary([I|Is]) -> - [I|finish_select_binary(Is)]; -finish_select_binary([]) -> []. - -%% New instructions for selection of binary segments. - -select_bin_segs(Scs, Ivar, Tf, Bef, St) -> - match_fmf(fun(S, Fail, Sta) -> - select_bin_seg(S, Ivar, Fail, Bef, Sta) end, - Tf, St, Scs). - -select_bin_seg(#k_val_clause{val=#k_bin_seg{size=Size,unit=U,type=T, - seg=Seg,flags=Fs0,next=Next}, - body=B, - anno=#l{i=I,vdb=Vdb,a=A}}, Ivar, Fail, Bef, St0) -> - Ctx = St0#cg.ctx, - Fs = [{anno,A}|Fs0], - Es = case Next of - [] -> [Seg]; - _ -> [Seg,Next] - end, - {Mis,Int,St1} = select_extract_bin(Es, Size, U, T, Fs, Fail, - I, Vdb, Bef, Ctx, B, St0), - {Bis,Aft,St2} = match_cg(B, Fail, Int, St1), - CtxReg = fetch_var(Ctx, Bef), - Is = if - Mis =:= [] -> - %% No bs_restore2 instruction needed if no match instructions. - Bis; - true -> - [{bs_restore2,CtxReg,{Ctx,Ivar}}|Mis++Bis] - end, - {Is,Aft,St2}; -select_bin_seg(#k_val_clause{val=#k_bin_int{size=Sz,unit=U,flags=Fs, - val=Val,next=Next}, - body=B, - anno=#l{i=I,vdb=Vdb}}, Ivar, Fail, Bef, St0) -> - Ctx = St0#cg.ctx, - {Mis,Int,St1} = select_extract_int(Next, Val, Sz, U, Fs, Fail, - I, Vdb, Bef, Ctx, St0), - {Bis,Aft,St2} = match_cg(B, Fail, Int, St1), - CtxReg = fetch_var(Ctx, Bef), - Is = case Mis ++ Bis of - [{test,bs_match_string,F,[OtherCtx,Bin1]}, - {bs_save2,OtherCtx,_}, - {bs_restore2,OtherCtx,_}, - {test,bs_match_string,F,[OtherCtx,Bin2]}|Is0] -> - %% We used to do this optimization later, but it - %% turns out that in huge functions with many - %% bs_match_string instructions, it's a big win - %% to do the combination now. To avoid copying the - %% binary data again and again, we'll combine bitstrings - %% in a list and convert all of it to a bitstring later. - [{test,bs_match_string,F,[OtherCtx,[Bin1,Bin2]]}|Is0]; - Is0 -> - Is0 - end, - {[{bs_restore2,CtxReg,{Ctx,Ivar}}|Is],Aft,St2}. - -select_extract_int(#k_var{name=Tl}, Val, #k_int{val=Sz}, U, Fs, Vf, - I, Vdb, Bef, Ctx, St) -> - Bits = U*Sz, - Bin = case member(big, Fs) of - true -> - <>; - false -> - true = member(little, Fs), %Assertion. - <> - end, - Bits = bit_size(Bin), %Assertion. - CtxReg = fetch_var(Ctx, Bef), - Is = if - Bits =:= 0 -> - [{bs_save2,CtxReg,{Ctx,Tl}}]; - true -> - [{test,bs_match_string,{f,Vf},[CtxReg,Bin]}, - {bs_save2,CtxReg,{Ctx,Tl}}] - end, - {Is,clear_dead(Bef, I, Vdb),St}. - -select_extract_bin([#k_var{name=Hd},#k_var{name=Tl}], Size0, Unit, Type, Flags, Vf, - I, Vdb, Bef, Ctx, _Body, St) -> - SizeReg = get_bin_size_reg(Size0, Bef), - {Es,Aft} = - case vdb_find(Hd, Vdb) of - {_,_,Lhd} when Lhd =< I -> - %% The extracted value will not be used. - CtxReg = fetch_var(Ctx, Bef), - Live = max_reg(Bef#sr.reg), - Skip = build_skip_instr(Type, Vf, CtxReg, Live, - SizeReg, Unit, Flags), - {[Skip,{bs_save2,CtxReg,{Ctx,Tl}}],Bef}; - {_,_,_} -> - Reg = put_reg(Hd, Bef#sr.reg), - Int1 = Bef#sr{reg=Reg}, - Rhd = fetch_reg(Hd, Reg), - CtxReg = fetch_reg(Ctx, Reg), - Live = max_reg(Bef#sr.reg), - {[build_bs_instr(Type, Vf, CtxReg, Live, SizeReg, - Unit, Flags, Rhd), - {bs_save2,CtxReg,{Ctx,Tl}}],Int1} - end, - {Es,clear_dead(Aft, I, Vdb),St}; -select_extract_bin([#k_var{name=Hd}], Size, Unit, binary, Flags, Vf, - I, Vdb, Bef, Ctx, Body, St) -> - %% Match the last segment of a binary. We KNOW that the size - %% must be 'all'. - #k_atom{val=all} = Size, %Assertion. - {Es,Aft} = - case vdb_find(Hd, Vdb) of - {_,_,Lhd} when Lhd =< I -> - %% The result will not be used. Furthermore, since we - %% we are at the end of the binary, the position will - %% not be used again; thus, it is safe to do a cheaper - %% test of the unit. - CtxReg = fetch_var(Ctx, Bef), - {case Unit of - 1 -> - []; - _ -> - [{test,bs_test_unit,{f,Vf},[CtxReg,Unit]}] - end,Bef}; - {_,_,_} -> - case is_context_unused(Body) of - false -> - Reg = put_reg(Hd, Bef#sr.reg), - Int1 = Bef#sr{reg=Reg}, - Rhd = fetch_reg(Hd, Reg), - CtxReg = fetch_reg(Ctx, Reg), - Name = bs_get_binary2, - Live = max_reg(Bef#sr.reg), - {[{test,Name,{f,Vf},Live, - [CtxReg,atomic(Size),Unit,{field_flags,Flags}],Rhd}], - Int1}; - true -> - %% Since the matching context will not be used again, - %% we can reuse its register. Reusing the register - %% opens some interesting optimizations in the - %% run-time system. - - Reg0 = Bef#sr.reg, - CtxReg = fetch_reg(Ctx, Reg0), - Reg = replace_reg_contents(Ctx, Hd, Reg0), - Int1 = Bef#sr{reg=Reg}, - Name = bs_get_binary2, - Live = max_reg(Int1#sr.reg), - {[{test,Name,{f,Vf},Live, - [CtxReg,atomic(Size),Unit,{field_flags,Flags}],CtxReg}], - Int1} - end - end, - {Es,clear_dead(Aft, I, Vdb),St}. - -%% is_context_unused(Ke) -> true | false -%% Simple heurististic to determine whether the code that follows -%% will use the current matching context again. (The liveness -%% information is too conservative to be useful for this purpose.) -%% 'true' means that the code that follows will definitely not use -%% the context again (because it is a block, not guard or matching -%% code); 'false' that we are not sure (there could be more -%% matching). - -is_context_unused(#k_alt{then=Then}) -> - %% #k_alt{} can be used for different purposes. If the Then part - %% is a block, it means that matching has finished and is used for a guard - %% to choose between the matched clauses. - is_context_unused(Then); -is_context_unused(#cg_block{}) -> - true; -is_context_unused(_) -> - false. - -select_bin_end(#k_val_clause{val=#k_bin_end{},body=B}, Ivar, Tf, Bef, St0) -> - Ctx = St0#cg.ctx, - {Bis,Aft,St2} = match_cg(B, Tf, Bef, St0), - CtxReg = fetch_var(Ctx, Bef), - {[{bs_restore2,CtxReg,{Ctx,Ivar}}, - {test,bs_test_tail2,{f,Tf},[CtxReg,0]}|Bis],Aft,St2}. - -get_bin_size_reg(#k_var{name=V}, Bef) -> - fetch_var(V, Bef); -get_bin_size_reg(Literal, _Bef) -> - atomic(Literal). - -build_bs_instr(Type, Vf, CtxReg, Live, SizeReg, Unit, Flags, Rhd) -> - {Format,Name} = case Type of - integer -> {plain,bs_get_integer2}; - float -> {plain,bs_get_float2}; - binary -> {plain,bs_get_binary2}; - utf8 -> {utf,bs_get_utf8}; - utf16 -> {utf,bs_get_utf16}; - utf32 -> {utf,bs_get_utf32} - end, - case Format of - plain -> - {test,Name,{f,Vf},Live, - [CtxReg,SizeReg,Unit,{field_flags,Flags}],Rhd}; - utf -> - {test,Name,{f,Vf},Live, - [CtxReg,{field_flags,Flags}],Rhd} - end. - -build_skip_instr(Type, Vf, CtxReg, Live, SizeReg, Unit, Flags) -> - {Format,Name} = case Type of - utf8 -> {utf,bs_skip_utf8}; - utf16 -> {utf,bs_skip_utf16}; - utf32 -> {utf,bs_skip_utf32}; - _ -> {plain,bs_skip_bits2} - end, - case Format of - plain -> - {test,Name,{f,Vf},[CtxReg,SizeReg,Unit,{field_flags,Flags}]}; - utf -> - {test,Name,{f,Vf},[CtxReg,Live,{field_flags,Flags}]} - end. - -select_val(#k_val_clause{val=#k_tuple{es=Es},body=B,anno=#l{i=I,vdb=Vdb}}, - V, Vf, Bef, St0) -> - {Eis,Int,St1} = select_extract_tuple(V, Es, I, Vdb, Bef, St0), - {Bis,Aft,St2} = match_cg(B, Vf, Int, St1), - {length(Es),Eis ++ Bis,Aft,St2}; -select_val(#k_val_clause{val=Val0,body=B}, _V, Vf, Bef, St0) -> - Val = case Val0 of - #k_atom{val=Lit} -> Lit; - #k_float{val=Lit} -> Lit; - #k_int{val=Lit} -> Lit; - #k_literal{val=Lit} -> Lit - end, - {Bis,Aft,St1} = match_cg(B, Vf, Bef, St0), - {Val,Bis,Aft,St1}. - -%% select_extract_tuple(Src, [V], I, Vdb, StackReg, State) -> -%% {[E],StackReg,State}. -%% Extract tuple elements, but only if they do not immediately die. - -select_extract_tuple(Src, Vs, I, Vdb, Bef, St) -> - F = fun (#k_var{name=V}, {Int0,Elem}) -> - case vdb_find(V, Vdb) of - {V,_,L} when L =< I -> {[], {Int0,Elem+1}}; - _Other -> - Reg1 = put_reg(V, Int0#sr.reg), - Int1 = Int0#sr{reg=Reg1}, - Rsrc = fetch_var(Src, Int1), - {[{get_tuple_element,Rsrc,Elem,fetch_reg(V, Reg1)}], - {Int1,Elem+1}} - end - end, - {Es,{Aft,_}} = flatmapfoldl(F, {Bef,0}, Vs), - {Es,Aft,St}. - -select_map(Scs, V, Tf, Vf, Bef, St0) -> - Reg = fetch_var(V, Bef), - {Is,Aft,St1} = - match_fmf(fun(#k_val_clause{val=#k_map{op=exact,es=Es}, - body=B,anno=#l{i=I,vdb=Vdb}}, Fail, St1) -> - select_map_val(V, Es, B, Fail, I, Vdb, Bef, St1) - end, Vf, St0, Scs), - {[{test,is_map,{f,Tf},[Reg]}|Is],Aft,St1}. - -select_map_val(V, Es, B, Fail, I, Vdb, Bef, St0) -> - {Eis,Int,St1} = select_extract_map(V, Es, Fail, I, Vdb, Bef, St0), - {Bis,Aft,St2} = match_cg(B, Fail, Int, St1), - {Eis++Bis,Aft,St2}. - -select_extract_map(_, [], _, _, _, Bef, St) -> {[],Bef,St}; -select_extract_map(Src, Vs, Fail, I, Vdb, Bef, St) -> - %% First split the instruction flow - %% We want one set of each - %% 1) has_map_fields (no target registers) - %% 2) get_map_elements (with target registers) - %% Assume keys are term-sorted - Rsrc = fetch_var(Src, Bef), - - {{HasKs,GetVs,HasVarKs,GetVarVs},Aft} = - foldr(fun(#k_map_pair{key=#k_var{name=K},val=#k_var{name=V}}, - {{HasKsi,GetVsi,HasVarVsi,GetVarVsi},Int0}) -> - case vdb_find(V, Vdb) of - {V,_,L} when L =< I -> - RK = fetch_var(K,Int0), - {{HasKsi,GetVsi,[RK|HasVarVsi],GetVarVsi},Int0}; - _Other -> - Reg1 = put_reg(V, Int0#sr.reg), - Int1 = Int0#sr{reg=Reg1}, - RK = fetch_var(K,Int0), - RV = fetch_reg(V,Reg1), - {{HasKsi,GetVsi,HasVarVsi,[[RK,RV]|GetVarVsi]},Int1} - end; - (#k_map_pair{key=Key,val=#k_var{name=V}}, - {{HasKsi,GetVsi,HasVarVsi,GetVarVsi},Int0}) -> - case vdb_find(V, Vdb) of - {V,_,L} when L =< I -> - {{[atomic(Key)|HasKsi],GetVsi,HasVarVsi,GetVarVsi},Int0}; - _Other -> - Reg1 = put_reg(V, Int0#sr.reg), - Int1 = Int0#sr{reg=Reg1}, - {{HasKsi,[atomic(Key),fetch_reg(V, Reg1)|GetVsi], - HasVarVsi,GetVarVsi},Int1} - end - end, {{[],[],[],[]},Bef}, Vs), - - Code = [{test,has_map_fields,{f,Fail},Rsrc,{list,HasKs}} || HasKs =/= []] ++ - [{test,has_map_fields,{f,Fail},Rsrc,{list,[K]}} || K <- HasVarKs] ++ - [{get_map_elements, {f,Fail},Rsrc,{list,GetVs}} || GetVs =/= []] ++ - [{get_map_elements, {f,Fail},Rsrc,{list,[K,V]}} || [K,V] <- GetVarVs], - {Code, Aft, St}. - - -select_extract_cons(Src, [#k_var{name=Hd},#k_var{name=Tl}], I, Vdb, Bef, St) -> - Rsrc = fetch_var(Src, Bef), - Int = clear_dead(Bef, I, Vdb), - {{_,_,Lhd},{_,_,Ltl}} = {vdb_find(Hd, Vdb),vdb_find(Tl, Vdb)}, - case {Lhd =< I, Ltl =< I} of - {true,true} -> - %% Both dead. - {[],Bef,St}; - {true,false} -> - %% Head dead. - Reg0 = put_reg(Tl, Bef#sr.reg), - Aft = Int#sr{reg=Reg0}, - Rtl = fetch_reg(Tl, Reg0), - {[{get_tl,Rsrc,Rtl}],Aft,St}; - {false,true} -> - %% Tail dead. - Reg0 = put_reg(Hd, Bef#sr.reg), - Aft = Int#sr{reg=Reg0}, - Rhd = fetch_reg(Hd, Reg0), - {[{get_hd,Rsrc,Rhd}],Aft,St}; - {false,false} -> - %% Both used. - Reg0 = put_reg(Tl, put_reg(Hd, Bef#sr.reg)), - Aft = Bef#sr{reg=Reg0}, - Rhd = fetch_reg(Hd, Reg0), - Rtl = fetch_reg(Tl, Reg0), - {[{get_hd,Rsrc,Rhd},{get_tl,Rsrc,Rtl}],Aft,St} - end. - -guard_clause_cg(#k_guard_clause{anno=#l{vdb=Vdb},guard=G,body=B}, Fail, Bef, St0) -> - {Gis,Int,St1} = guard_cg(G, Fail, Vdb, Bef, St0), - {Bis,Aft,St} = match_cg(B, Fail, Int, St1), - {Gis ++ Bis,Aft,St}. - -%% guard_cg(Guard, Fail, Vdb, StackReg, State) -> -%% {[Ainstr],StackReg,State}. -%% A guard is a boolean expression of tests. Tests return true or -%% false. A fault in a test causes the test to return false. Tests -%% never return the boolean, instead we generate jump code to go to -%% the correct exit point. Primops and tests all go to the next -%% instruction on success or jump to a failure label. - -guard_cg(#k_protected{arg=Ts,ret=Rs,anno=#l{vdb=Pdb}}, Fail, _Vdb, Bef, St) -> - protected_cg(Ts, Rs, Fail, Pdb, Bef, St); -guard_cg(#k_test{anno=#l{i=I},op=Test0,args=As,inverted=Inverted}, - Fail, Vdb, Bef, St0) -> - #k_remote{mod=#k_atom{val=erlang},name=#k_atom{val=Test}} = Test0, - case Inverted of - false -> - test_cg(Test, As, Fail, I, Vdb, Bef, St0); - true -> - {Psucc,St1} = new_label(St0), - {Is,Aft,St2} = test_cg(Test, As, Psucc, I, Vdb, Bef, St1), - {Is++[{jump,{f,Fail}},{label,Psucc}],Aft,St2} - end; -guard_cg(G, _Fail, Vdb, Bef, St) -> - %%ok = io:fwrite("cg ~w: ~p~n", [?LINE,{G,Fail,Vdb,Bef}]), - {Gis,Aft,St1} = cg(G, Vdb, Bef, St), - %%ok = io:fwrite("cg ~w: ~p~n", [?LINE,{Aft}]), - {Gis,Aft,St1}. - -%% guard_cg_list([Kexpr], Fail, I, Vdb, StackReg, St) -> -%% {[Ainstr],StackReg,St}. - -guard_cg_list(Kes, Fail, Vdb, Bef, St0) -> - {Keis,{Aft,St1}} = - flatmapfoldl(fun (Ke, {Inta,Sta}) -> - {Keis,Intb,Stb} = - guard_cg(Ke, Fail, Vdb, Inta, Sta), - {Keis,{Intb,Stb}} - end, {Bef,St0}, need_heap(Kes)), - {Keis,Aft,St1}. - -%% protected_cg([Kexpr], [Ret], Fail, I, Vdb, Bef, St) -> {[Ainstr],Aft,St}. -%% Do a protected. Protecteds without return values are just done -%% for effect, the return value is not checked, success passes on to -%% the next instruction and failure jumps to Fail. If there are -%% return values then these must be set to 'false' on failure, -%% control always passes to the next instruction. - -protected_cg(Ts, [], Fail, Vdb, Bef, St0) -> - %% Protect these calls, revert when done. - {Tis,Aft,St1} = guard_cg_list(Ts, Fail, Vdb, Bef, St0#cg{bfail=Fail}), - {Tis,Aft,St1#cg{bfail=St0#cg.bfail}}; -protected_cg(Ts, Rs, _Fail, Vdb, Bef, St0) -> - {Pfail,St1} = new_label(St0), - {Psucc,St2} = new_label(St1), - {Tis,Aft,St3} = guard_cg_list(Ts, Pfail, Vdb, Bef, - St2#cg{bfail=Pfail}), - %%ok = io:fwrite("cg ~w: ~p~n", [?LINE,{Rs,I,Vdb,Aft}]), - %% Set return values to false. - Mis = [{move,{atom,false},fetch_var(V,Aft)}||#k_var{name=V} <- Rs], - {Tis ++ [{jump,{f,Psucc}}, - {label,Pfail}] ++ Mis ++ [{label,Psucc}], - Aft,St3#cg{bfail=St0#cg.bfail}}. - -%% test_cg(TestName, Args, Fail, I, Vdb, Bef, St) -> {[Ainstr],Aft,St}. -%% Generate test instruction. Use explicit fail label here. - -test_cg(is_map, [A], Fail, I, Vdb, Bef, St) -> - %% We must avoid creating code like this: - %% - %% move x(0) y(0) - %% is_map Fail [x(0)] - %% make_fun => x(0) %% Overwrite x(0) - %% put_map_assoc y(0) ... - %% - %% The code is safe, but beam_validator does not understand that. - %% Extending beam_validator to handle such (rare) code as the - %% above would make it slower for all programs. Instead, change - %% the code generator to always prefer the Y register for is_map() - %% and put_map_assoc() instructions, ensuring that they use the - %% same register. - Arg = cg_reg_arg_prefer_y(A, Bef), - Aft = clear_dead(Bef, I, Vdb), - {[{test,is_map,{f,Fail},[Arg]}],Aft,St}; -test_cg(is_boolean, [#k_atom{val=Val}], Fail, I, Vdb, Bef, St) -> - Aft = clear_dead(Bef, I, Vdb), - Is = case is_boolean(Val) of - true -> []; - false -> [{jump,{f,Fail}}] - end, - {Is,Aft,St}; -test_cg(Test, As, Fail, I, Vdb, Bef, St) -> - Args = cg_reg_args(As, Bef), - Aft = clear_dead(Bef, I, Vdb), - {[beam_utils:bif_to_test(Test, Args, {f,Fail})],Aft,St}. - -%% match_fmf(Fun, LastFail, State, [Clause]) -> {Is,Aft,State}. -%% This is a special flatmapfoldl for match code gen where we -%% generate a "failure" label for each clause. The last clause uses -%% an externally generated failure label, LastFail. N.B. We do not -%% know or care how the failure labels are used. - -match_fmf(F, LastFail, St, [H]) -> - F(H, LastFail, St); -match_fmf(F, LastFail, St0, [H|T]) -> - {Fail,St1} = new_label(St0), - {R,Aft1,St2} = F(H, Fail, St1), - {Rs,Aft2,St3} = match_fmf(F, LastFail, St2, T), - {R ++ [{label,Fail}] ++ Rs,sr_merge(Aft1, Aft2),St3}. - -%% call_cg(Func, [Arg], [Ret], Le, Vdb, StackReg, State) -> -%% {[Ainstr],StackReg,State}. -%% enter_cg(Func, [Arg], Le, Vdb, Bef, St) -> {[Ainstr],Aft,St}. -%% Call and enter first put the arguments into registers and save any -%% other registers, then clean up and compress the stack and set the -%% frame size. Finally the actual call is made. Call then needs the -%% return values filled in. - -call_cg(#k_var{}=Var, As, Rs, Le, Vdb, Bef, St0) -> - {Sis,Int} = cg_setup_call(As++[Var], Bef, Le#l.i, Vdb), - %% Put return values in registers. - Reg = load_vars(Rs, clear_regs(Int#sr.reg)), - %% Build complete code and final stack/register state. - Arity = length(As), - {Frees,Aft} = free_dead(clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb)), - {Sis ++ Frees ++ [line(Le),{call_fun,Arity}],Aft, - need_stack_frame(St0)}; -call_cg(#k_remote{mod=Mod,name=Name}, As, Rs, Le, Vdb, Bef, St0) - when is_record(Mod, k_var); is_record(Name, k_var) -> - {Sis,Int} = cg_setup_call(As++[Mod,Name], Bef, Le#l.i, Vdb), - %% Put return values in registers. - Reg = load_vars(Rs, clear_regs(Int#sr.reg)), - %% Build complete code and final stack/register state. - Arity = length(As), - St = need_stack_frame(St0), - %%{Call,St1} = build_call(Func, Arity, St0), - {Frees,Aft} = free_dead(clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb)), - {Sis ++ Frees ++ [line(Le),{apply,Arity}],Aft,St}; -call_cg(Func, As, Rs, Le, Vdb, Bef, St0) -> - case St0 of - #cg{bfail=Fail} when Fail =/= 0 -> - %% Inside a guard. The only allowed function call is to - %% erlang:error/1,2. We will generate the following code: - %% - %% move {atom,ok} DestReg - %% jump FailureLabel - #k_remote{mod=#k_atom{val=erlang}, - name=#k_atom{val=error}} = Func, %Assertion. - [#k_var{name=DestVar}] = Rs, - Int0 = clear_dead(Bef, Le#l.i, Vdb), - Reg = put_reg(DestVar, Int0#sr.reg), - Int = Int0#sr{reg=Reg}, - Dst = fetch_reg(DestVar, Reg), - {[{move,{atom,ok},Dst},{jump,{f,Fail}}], - clear_dead(Int, Le#l.i, Vdb),St0}; - #cg{} -> - %% Ordinary function call in a function body. - {Sis,Int} = cg_setup_call(As, Bef, Le#l.i, Vdb), - %% Put return values in registers. - Reg = load_vars(Rs, clear_regs(Int#sr.reg)), - %% Build complete code and final stack/register state. - Arity = length(As), - {Call,St1} = build_call(Func, Arity, St0), - {Frees,Aft} = free_dead(clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb)), - {Sis ++ Frees ++ [line(Le)|Call],Aft,St1} - end. - -build_call(#k_remote{mod=#k_atom{val=erlang},name=#k_atom{val='!'}}, 2, St0) -> - {[send],need_stack_frame(St0)}; -build_call(#k_remote{mod=#k_atom{val=Mod},name=#k_atom{val=Name}}, Arity, St0) -> - {[{call_ext,Arity,{extfunc,Mod,Name,Arity}}],need_stack_frame(St0)}; -build_call(#k_local{name=Name}, Arity, St0) when is_atom(Name) -> - {Lbl,St1} = local_func_label(Name, Arity, need_stack_frame(St0)), - {[{call,Arity,{f,Lbl}}],St1}. - -free_dead(#sr{stk=Stk0}=Aft) -> - {Instr,Stk} = free_dead(Stk0, 0, [], []), - {Instr,Aft#sr{stk=Stk}}. - -free_dead([dead|Stk], Y, Instr, StkAcc) -> - %% Note: kill/1 is equivalent to init/1 (translated by beam_asm). - %% We use kill/1 to help further optimisation passes. - free_dead(Stk, Y+1, [{kill,{yy,Y}}|Instr], [free|StkAcc]); -free_dead([Any|Stk], Y, Instr, StkAcc) -> - free_dead(Stk, Y+1, Instr, [Any|StkAcc]); -free_dead([], _, Instr, StkAcc) -> {Instr,reverse(StkAcc)}. - -enter_cg(#k_var{} = Var, As, Le, Vdb, Bef, St0) -> - {Sis,Int} = cg_setup_call(As++[Var], Bef, Le#l.i, Vdb), - %% Build complete code and final stack/register state. - Arity = length(As), - {Sis ++ [line(Le),{call_fun,Arity},return], - clear_dead(Int#sr{reg=clear_regs(Int#sr.reg)}, Le#l.i, Vdb), - need_stack_frame(St0)}; -enter_cg(#k_remote{mod=Mod,name=Name}, As, Le, Vdb, Bef, St0) - when is_record(Mod, k_var); is_record(Name, k_var) -> - {Sis,Int} = cg_setup_call(As++[Mod,Name], Bef, Le#l.i, Vdb), - %% Build complete code and final stack/register state. - Arity = length(As), - St = need_stack_frame(St0), - {Sis ++ [line(Le),{apply_only,Arity}], - clear_dead(Int#sr{reg=clear_regs(Int#sr.reg)}, Le#l.i, Vdb), - St}; -enter_cg(Func, As, Le, Vdb, Bef, St0) -> - {Sis,Int} = cg_setup_call(As, Bef, Le#l.i, Vdb), - %% Build complete code and final stack/register state. - Arity = length(As), - {Call,St1} = build_enter(Func, Arity, St0), - Line = enter_line(Func, Arity, Le), - {Sis ++ Line ++ Call, - clear_dead(Int#sr{reg=clear_regs(Int#sr.reg)}, Le#l.i, Vdb), - St1}. - -build_enter(#k_remote{mod=#k_atom{val=erlang},name=#k_atom{val='!'}}, 2, St0) -> - {[send,return],need_stack_frame(St0)}; -build_enter(#k_remote{mod=#k_atom{val=Mod},name=#k_atom{val=Name}}, Arity, St0) -> - St1 = case trap_bif(Mod, Name, Arity) of - true -> need_stack_frame(St0); - false -> St0 - end, - {[{call_ext_only,Arity,{extfunc,Mod,Name,Arity}}],St1}; -build_enter(#k_local{name=Name}, Arity, St0) when is_atom(Name) -> - {Lbl,St1} = local_func_label(Name, Arity, St0), - {[{call_only,Arity,{f,Lbl}}],St1}. - -enter_line(#k_remote{mod=#k_atom{val=Mod},name=#k_atom{val=Name}}, Arity, Le) -> - case erl_bifs:is_safe(Mod, Name, Arity) of - false -> - %% Tail-recursive call, possibly to a BIF. - %% We'll need a line instruction in case the - %% BIF call fails. - [line(Le)]; - true -> - %% Call to a safe BIF. Since it cannot fail, - %% we don't need any line instruction here. - [] - end; -enter_line(_, _, _) -> - %% Tail-recursive call to a local function. A line - %% instruction will not be useful. - []. - -%% local_func_label(Name, Arity, State) -> {Label,State'} -%% local_func_label({Name,Arity}, State) -> {Label,State'} -%% Get the function entry label for a local function. - -local_func_label(Name, Arity, St) -> - local_func_label({Name,Arity}, St). - -local_func_label(Key, #cg{functable=Map}=St0) -> - case Map of - #{Key := Label} -> {Label,St0}; - _ -> - {Label,St} = new_label(St0), - {Label,St#cg{functable=Map#{Key => Label}}} - end. - -%% need_stack_frame(State) -> State' -%% Make a note in the state that this function will need a stack frame. - -need_stack_frame(#cg{need_frame=true}=St) -> St; -need_stack_frame(St) -> St#cg{need_frame=true}. - -%% trap_bif(Mod, Name, Arity) -> true|false -%% Trap bifs that need a stack frame. - -trap_bif(erlang, link, 1) -> true; -trap_bif(erlang, unlink, 1) -> true; -trap_bif(erlang, monitor_node, 2) -> true; -trap_bif(erlang, group_leader, 2) -> true; -trap_bif(erlang, exit, 2) -> true; -trap_bif(_, _, _) -> false. - -%% bif_cg(#k_bif{}, Le, Vdb, StackReg, State) -> -%% {[Ainstr],StackReg,State}. -%% Generate code a BIF. - -bif_cg(#k_bif{op=#k_internal{name=Name},args=As,ret=Rs}, Le, Vdb, Bef, St) -> - internal_cg(Name, As, Rs, Le, Vdb, Bef, St); -bif_cg(#k_bif{op=#k_remote{mod=#k_atom{val=erlang},name=#k_atom{val=Name}}, - args=As,ret=Rs}, Le, Vdb, Bef, St) -> - Ar = length(As), - case is_gc_bif(Name, Ar) of - false -> - bif_cg(Name, As, Rs, Le, Vdb, Bef, St); - true -> - gc_bif_cg(Name, As, Rs, Le, Vdb, Bef, St) - end. - -%% internal_cg(Bif, [Arg], [Ret], Le, Vdb, StackReg, State) -> -%% {[Ainstr],StackReg,State}. - -internal_cg(bs_context_to_binary=Instr, [Src0], [], Le, Vdb, Bef, St0) -> - [Src] = cg_reg_args([Src0], Bef), - {[{Instr,Src}],clear_dead(Bef, Le#l.i, Vdb), St0}; -internal_cg(dsetelement, [Index0,Tuple0,New0], _Rs, Le, Vdb, Bef, St0) -> - [New,Tuple,{integer,Index1}] = cg_reg_args([New0,Tuple0,Index0], Bef), - Index = Index1-1, - {[{set_tuple_element,New,Tuple,Index}], - clear_dead(Bef, Le#l.i, Vdb), St0}; -internal_cg(make_fun, [Func0,Arity0|As], Rs, Le, Vdb, Bef, St0) -> - %% This behaves more like a function call. - #k_atom{val=Func} = Func0, - #k_int{val=Arity} = Arity0, - {Sis,Int} = cg_setup_call(As, Bef, Le#l.i, Vdb), - Reg = load_vars(Rs, clear_regs(Int#sr.reg)), - {FuncLbl,St1} = local_func_label(Func, Arity, St0), - MakeFun = {make_fun2,{f,FuncLbl},0,0,length(As)}, - {Sis ++ [MakeFun], - clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb), - St1}; -internal_cg(bs_init_writable=I, As, Rs, Le, Vdb, Bef, St) -> - %% This behaves like a function call. - {Sis,Int} = cg_setup_call(As, Bef, Le#l.i, Vdb), - Reg = load_vars(Rs, clear_regs(Int#sr.reg)), - {Sis++[I],clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb),St}; -internal_cg(build_stacktrace=I, As, Rs, Le, Vdb, Bef, St) -> - %% This behaves like a function call. - {Sis,Int} = cg_setup_call(As, Bef, Le#l.i, Vdb), - Reg = load_vars(Rs, clear_regs(Int#sr.reg)), - {Sis++[I],clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb),St}; -internal_cg(raise, As, Rs, Le, Vdb, Bef, St) -> - %% raise can be treated like a guard BIF. - bif_cg(raise, As, Rs, Le, Vdb, Bef, St); -internal_cg(guard_error, [ExitCall], _Rs, Le, Vdb, Bef, St) -> - %% A call an exit BIF from inside a #k_guard_match{}. - %% Generate a standard call, but leave the register descriptors - %% alone, effectively pretending that there was no call. - #k_call{op=#k_remote{mod=#k_atom{val=Mod},name=#k_atom{val=Name}}, - args=As} = ExitCall, - Arity = length(As), - {Ms,_} = cg_call_args(As, Bef, Le#l.i, Vdb), - Call = {call_ext,Arity,{extfunc,Mod,Name,Arity}}, - Is = Ms++[line(Le),Call], - {Is,Bef,St}; -internal_cg(raw_raise=I, As, Rs, Le, Vdb, Bef, St) -> - %% This behaves like a function call. - {Sis,Int} = cg_setup_call(As, Bef, Le#l.i, Vdb), - Reg = load_vars(Rs, clear_regs(Int#sr.reg)), - {Sis++[I],clear_dead(Int#sr{reg=Reg}, Le#l.i, Vdb),St}. - -%% bif_cg(Bif, [Arg], [Ret], Le, Vdb, StackReg, State) -> -%% {[Ainstr],StackReg,State}. - -bif_cg(Bif, As, [#k_var{name=V}], Le, Vdb, Bef, St0) -> - Ars = cg_reg_args(As, Bef), - - %% If we are inside a catch and in a body (not in guard) and the - %% BIF may fail, we must save everything that will be alive after - %% the catch (because the code after the code assumes that all - %% variables that are live are stored on the stack). - %% - %% Currently, we are somewhat pessimistic in - %% that we save any variable that will be live after this BIF call. - - MayFail = not erl_bifs:is_safe(erlang, Bif, length(As)), - {Sis,Int0} = - case MayFail of - true -> - maybe_adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb, St0); - false -> - {[],Bef} - end, - Int1 = clear_dead(Int0, Le#l.i, Vdb), - Reg = put_reg(V, Int1#sr.reg), - Int = Int1#sr{reg=Reg}, - Dst = fetch_reg(V, Reg), - BifFail = {f,St0#cg.bfail}, - %% We need a line instructions for BIFs that may fail in a body. - Line = case BifFail of - {f,0} when MayFail -> - [line(Le)]; - _ -> - [] - end, - {Sis++Line++[{bif,Bif,BifFail,Ars,Dst}], - clear_dead(Int, Le#l.i, Vdb), St0}. - - -%% gc_bif_cg(Bif, [Arg], [Ret], Le, Vdb, StackReg, State) -> -%% {[Ainstr],StackReg,State}. - -gc_bif_cg(Bif, As, [#k_var{name=V}], Le, Vdb, Bef, St0) -> - Ars = cg_reg_args(As, Bef), - - %% If we are inside a catch and in a body (not in guard) and the - %% BIF may fail, we must save everything that will be alive after - %% the catch (because the code after the code assumes that all - %% variables that are live are stored on the stack). - %% - %% Currently, we are somewhat pessimistic in - %% that we save any variable that will be live after this BIF call. - - {Sis,Int0} = maybe_adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb, St0), - - Int1 = clear_dead(Int0, Le#l.i, Vdb), - Reg = put_reg(V, Int1#sr.reg), - Int = Int1#sr{reg=Reg}, - Dst = fetch_reg(V, Reg), - BifFail = {f,St0#cg.bfail}, - Line = case BifFail of - {f,0} -> [line(Le)]; - {f,_} -> [] - end, - {Sis++Line++[{gc_bif,Bif,BifFail,max_reg(Bef#sr.reg),Ars,Dst}], - clear_dead(Int, Le#l.i, Vdb), St0}. - -%% recv_loop_cg(TimeOut, ReceiveVar, ReceiveMatch, TimeOutExprs, -%% [Ret], Le, Vdb, Bef, St) -> {[Ainstr],Aft,St}. - -recv_loop_cg(Te, Rvar, Rm, Tes, Rs, Le, Vdb, Bef, St0) -> - {Sis,Int0} = adjust_stack(Bef, Le#l.i, Le#l.i, Vdb), - Int1 = Int0#sr{reg=clear_regs(Int0#sr.reg)}, - %% Get labels. - {Rl,St1} = new_label(St0), - {Tl,St2} = new_label(St1), - {Bl,St3} = new_label(St2), - St4 = St3#cg{break=Bl,recv=Rl}, %Set correct receive labels - {Ris,Raft,St5} = cg_recv_mesg(Rvar, Rm, Tl, Int1, St4), - {Wis,Taft,St6} = cg_recv_wait(Te, Tes, Le#l.i, Int1, St5), - Int2 = sr_merge(Raft, Taft), %Merge stack/registers - Reg = load_vars(Rs, Int2#sr.reg), - {Sis ++ [line(Le)] ++ Ris ++ [{label,Tl}] ++ Wis ++ [{label,Bl}], - clear_dead(Int2#sr{reg=Reg}, Le#l.i, Vdb), - St6#cg{break=St0#cg.break,recv=St0#cg.recv}}. - -%% cg_recv_mesg( ) -> {[Ainstr],Aft,St}. - -cg_recv_mesg(#k_var{name=R}, Rm, Tl, Bef, St0) -> - Int0 = Bef#sr{reg=put_reg(R, Bef#sr.reg)}, - Ret = fetch_reg(R, Int0#sr.reg), - %% Int1 = clear_dead(Int0, I, Rm#l.vdb), - Int1 = Int0, - {Mis,Int2,St1} = match_cg(Rm, none, Int1, St0), - {[{label,St1#cg.recv},{loop_rec,{f,Tl},Ret}|Mis],Int2,St1}. - -%% cg_recv_wait(Te, Tes, I, Vdb, Int2, St3) -> {[Ainstr],Aft,St}. - -cg_recv_wait(#k_atom{val=infinity}, #cg_block{anno=Le,es=Tes}, I, Bef, St0) -> - %% We know that the 'after' body will never be executed. - %% But to keep the stack and register information up to date, - %% we will generate the code for the 'after' body, and then discard it. - Int1 = clear_dead(Bef, I, Le#l.vdb), - {_,Int2,St1} = cg_block(Tes, Le#l.vdb, - Int1#sr{reg=clear_regs(Int1#sr.reg)}, St0), - {[{wait,{f,St1#cg.recv}}],Int2,St1}; -cg_recv_wait(#k_int{val=0}, #cg_block{anno=Le,es=Tes}, _I, Bef, St0) -> - {Tis,Int,St1} = cg_block(Tes, Le#l.vdb, Bef, St0), - {[timeout|Tis],Int,St1}; -cg_recv_wait(Te, #cg_block{anno=Le,es=Tes}, I, Bef, St0) -> - Reg = cg_reg_arg(Te, Bef), - %% Must have empty registers here! Bug if anything in registers. - Int0 = clear_dead(Bef, I, Le#l.vdb), - {Tis,Int,St1} = cg_block(Tes, Le#l.vdb, - Int0#sr{reg=clear_regs(Int0#sr.reg)}, St0), - {[{wait_timeout,{f,St1#cg.recv},Reg},timeout] ++ Tis,Int,St1}. - -%% recv_next_cg(Le, Vdb, StackReg, St) -> {[Ainstr],StackReg,St}. -%% Use adjust stack to clear stack, but only need it for Aft. - -recv_next_cg(Le, Vdb, Bef, St) -> - {Sis,Aft} = adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb), - {[{loop_rec_end,{f,St#cg.recv}}] ++ Sis,Aft,St}. %Joke - -%% try_cg(TryBlock, [BodyVar], TryBody, [ExcpVar], TryHandler, [Ret], -%% Le, Vdb, StackReg, St) -> {[Ainstr],StackReg,St}. - -try_cg(Ta, Vs, Tb, Evs, Th, Rs, Le, Vdb, Bef, St0) -> - {B,St1} = new_label(St0), %Body label - {H,St2} = new_label(St1), %Handler label - {E,St3} = new_label(St2), %End label - #l{i=TryTag} = get_kanno(Ta), - Int1 = Bef#sr{stk=put_catch(TryTag, Bef#sr.stk)}, - TryReg = fetch_stack({catch_tag,TryTag}, Int1#sr.stk), - {Ais,Int2,St4} = cg(Ta, Vdb, Int1, St3#cg{break=B,in_catch=true}), - Int3 = Int2#sr{stk=drop_catch(TryTag, Int2#sr.stk)}, - St5 = St4#cg{break=E,in_catch=St3#cg.in_catch}, - {Bis,Baft,St6} = cg(Tb, Vdb, Int3#sr{reg=load_vars(Vs, Int3#sr.reg)}, St5), - {His,Haft,St7} = cg(Th, Vdb, Int3#sr{reg=load_vars(Evs, Int3#sr.reg)}, St6), - Int4 = sr_merge(Baft, Haft), %Merge stack/registers - Aft = Int4#sr{reg=load_vars(Rs, Int4#sr.reg)}, - {[{'try',TryReg,{f,H}}] ++ Ais ++ - [{label,B},{try_end,TryReg}] ++ Bis ++ - [{label,H},{try_case,TryReg}] ++ His ++ - [{label,E}], - clear_dead(Aft, Le#l.i, Vdb), - St7#cg{break=St0#cg.break}}. - -try_enter_cg(Ta, Vs, Tb, Evs, Th, Le, Vdb, Bef, St0) -> - {B,St1} = new_label(St0), %Body label - {H,St2} = new_label(St1), %Handler label - #l{i=TryTag} = get_kanno(Ta), - Int1 = Bef#sr{stk=put_catch(TryTag, Bef#sr.stk)}, - TryReg = fetch_stack({catch_tag,TryTag}, Int1#sr.stk), - {Ais,Int2,St3} = cg(Ta, Vdb, Int1, St2#cg{break=B,in_catch=true}), - Int3 = Int2#sr{stk=drop_catch(TryTag, Int2#sr.stk)}, - St4 = St3#cg{in_catch=St2#cg.in_catch}, - {Bis,Baft,St5} = cg(Tb, Vdb, Int3#sr{reg=load_vars(Vs, Int3#sr.reg)}, St4), - {His,Haft,St6} = cg(Th, Vdb, Int3#sr{reg=load_vars(Evs, Int3#sr.reg)}, St5), - Int4 = sr_merge(Baft, Haft), %Merge stack/registers - Aft = Int4, - {[{'try',TryReg,{f,H}}] ++ Ais ++ - [{label,B},{try_end,TryReg}] ++ Bis ++ - [{label,H},{try_case,TryReg}] ++ His, - clear_dead(Aft, Le#l.i, Vdb), - St6#cg{break=St0#cg.break}}. - -%% catch_cg(CatchBlock, Ret, Le, Vdb, Bef, St) -> {[Ainstr],Aft,St}. - -catch_cg(#cg_block{es=C}, #k_var{name=R}, Le, Vdb, Bef, St0) -> - {B,St1} = new_label(St0), - CatchTag = Le#l.i, - Int1 = Bef#sr{stk=put_catch(CatchTag, Bef#sr.stk)}, - CatchReg = fetch_stack({catch_tag,CatchTag}, Int1#sr.stk), - {Cis,Int2,St2} = cg_block(C, Le#l.vdb, Int1, - St1#cg{break=B,in_catch=true}), - [] = Int2#sr.reg, %Assertion. - Aft = Int2#sr{reg=[{0,R}],stk=drop_catch(CatchTag, Int2#sr.stk)}, - {[{'catch',CatchReg,{f,B}}] ++ Cis ++ - [{label,B},{catch_end,CatchReg}], - clear_dead(Aft, Le#l.i, Vdb), - St2#cg{break=St1#cg.break,in_catch=St1#cg.in_catch}}. - -%% put_cg([Var], Constr, Le, Vdb, Bef, St) -> {[Ainstr],Aft,St}. -%% We have to be careful how a 'put' works. First the structure is -%% built, then it is filled and finally things can be cleared. The -%% annotation must reflect this and make sure that the return -%% variable is allocated first. -%% -%% put_list and put_map are atomic instructions, both of -%% which can safely resuse one of the source registers as target. - -put_cg([#k_var{name=R}], #k_cons{hd=Hd,tl=Tl}, Le, Vdb, Bef, St) -> - [S1,S2] = cg_reg_args([Hd,Tl], Bef), - Int0 = clear_dead(Bef, Le#l.i, Vdb), - Int1 = Int0#sr{reg=put_reg(R, Int0#sr.reg)}, - Ret = fetch_reg(R, Int1#sr.reg), - {[{put_list,S1,S2,Ret}], Int1, St}; -put_cg([#k_var{name=R}], #k_binary{segs=Segs}, Le, Vdb, Bef, - #cg{bfail=Bfail}=St) -> - %% At run-time, binaries are constructed in three stages: - %% 1) First the size of the binary is calculated. - %% 2) Then the binary is allocated. - %% 3) Then each field in the binary is constructed. - %% For simplicity, we use the target register to also hold the - %% size of the binary. Therefore the target register must *not* - %% be one of the source registers. - - %% First allocate the target register. - Int0 = Bef#sr{reg=put_reg(R, Bef#sr.reg)}, - Target = fetch_reg(R, Int0#sr.reg), - - %% Also allocate a scratch register for size calculations. - Temp = find_scratch_reg(Int0#sr.reg), - - %% First generate the code that constructs each field. - Fail = {f,Bfail}, - PutCode = cg_bin_put(Segs, Fail, Bef), - {Sis,Int1} = maybe_adjust_stack(Int0, Le#l.i, Le#l.i+1, Vdb, St), - MaxRegs = max_reg(Bef#sr.reg), - Aft = clear_dead(Int1, Le#l.i, Vdb), - - %% Now generate the complete code for constructing the binary. - Code = cg_binary(PutCode, Target, Temp, Fail, MaxRegs, Le#l.a), - {Sis++Code,Aft,St}; - -%% Map: single variable key. -put_cg([#k_var{name=R}], #k_map{op=Op,var=Map, - es=[#k_map_pair{key=#k_var{}=K,val=V}]}, - Le, Vdb, Bef, St0) -> - {Sis,Int0} = maybe_adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb, St0), - - SrcReg = cg_reg_arg_prefer_y(Map, Int0), - Line = line(Le#l.a), - - List = [cg_reg_arg(K,Int0),cg_reg_arg(V,Int0)], - - Live = max_reg(Bef#sr.reg), - - %% The target register can reuse one of the source registers. - Aft0 = clear_dead(Int0, Le#l.i, Vdb), - Aft = Aft0#sr{reg=put_reg(R, Aft0#sr.reg)}, - Target = fetch_reg(R, Aft#sr.reg), - - {Is,St1} = put_cg_map(Line, Op, SrcReg, Target, Live, List, St0), - {Sis++Is,Aft,St1}; - -%% Map: (possibly) multiple literal keys. -put_cg([#k_var{name=R}], #k_map{op=Op,var=Map,es=Es}, Le, Vdb, Bef, St0) -> - - %% assert key literals - [] = [Var || #k_map_pair{key=#k_var{}=Var} <- Es], - - {Sis,Int0} = maybe_adjust_stack(Bef, Le#l.i, Le#l.i+1, Vdb, St0), - SrcReg = cg_reg_arg_prefer_y(Map, Int0), - Line = line(Le#l.a), - - %% fetch registers for values to be put into the map - List = flatmap(fun(#k_map_pair{key=K,val=V}) -> - [atomic(K),cg_reg_arg(V, Int0)] - end, Es), - - Live = max_reg(Bef#sr.reg), - - %% The target register can reuse one of the source registers. - Aft0 = clear_dead(Int0, Le#l.i, Vdb), - Aft = Aft0#sr{reg=put_reg(R, Aft0#sr.reg)}, - Target = fetch_reg(R, Aft#sr.reg), - - {Is,St1} = put_cg_map(Line, Op, SrcReg, Target, Live, List, St0), - {Sis++Is,Aft,St1}; - -%% Everything else. -put_cg([#k_var{name=R}], Con, Le, Vdb, Bef, St) -> - %% Find a place for the return register first. - Int = Bef#sr{reg=put_reg(R, Bef#sr.reg)}, - Ret = fetch_reg(R, Int#sr.reg), - Ais = case Con of - #k_tuple{es=Es} -> - [{put_tuple,length(Es),Ret}] ++ cg_build_args(Es, Bef); - Other -> - [{move,cg_reg_arg(Other, Int),Ret}] - end, - {Ais,clear_dead(Int, Le#l.i, Vdb),St}. - - -put_cg_map(Line, Op0, SrcReg, Target, Live, List, St0) -> - Bfail = St0#cg.bfail, - Fail = {f,St0#cg.bfail}, - Op = case Op0 of - assoc -> put_map_assoc; - exact -> put_map_exact - end, - {OkLbl,St1} = new_label(St0), - {BadLbl,St2} = new_label(St1), - Is = if - Bfail =:= 0 orelse Op =:= put_map_assoc -> - [Line,{Op,{f,0},SrcReg,Target,Live,{list,List}}]; - true -> - %% Ensure that Target is always set, even if - %% the map update operation fails. That is necessary - %% because Target may be included in a test_heap - %% instruction. - [Line, - {Op,{f,BadLbl},SrcReg,Target,Live,{list,List}}, - {jump,{f,OkLbl}}, - {label,BadLbl}, - {move,{atom,ok},Target}, - {jump,Fail}, - {label,OkLbl}] - end, - {Is,St2}. - -%%% -%%% Code generation for constructing binaries. -%%% - -cg_binary([{bs_put_binary,Fail,{atom,all},U,_Flags,Src}|PutCode], - Target, Temp, Fail, MaxRegs, Anno) -> - Line = line(Anno), - Live = cg_live(Target, MaxRegs), - SzCode = cg_bitstr_size(PutCode, Target, Temp, Fail, Live), - BinFlags = {field_flags,[]}, - Code = [Line|SzCode] ++ - [case member(single_use, Anno) of - true -> - {bs_private_append,Fail,Target,U,Src,BinFlags,Target}; - false -> - {bs_append,Fail,Target,0,MaxRegs,U,Src,BinFlags,Target} - end] ++ PutCode, - cg_bin_opt(Code); -cg_binary(PutCode, Target, Temp, Fail, MaxRegs, Anno) -> - Line = line(Anno), - Live = cg_live(Target, MaxRegs), - {InitOp,SzCode} = cg_binary_size(PutCode, Target, Temp, Fail, Live), - - Code = [Line|SzCode] ++ [{InitOp,Fail,Target,0,MaxRegs, - {field_flags,[]},Target}|PutCode], - cg_bin_opt(Code). - -cg_live({x,X}, MaxRegs) when X =:= MaxRegs -> MaxRegs+1; -cg_live({x,X}, MaxRegs) when X < MaxRegs -> MaxRegs. - -%% Generate code that calculate the size of the bitstr to be -%% built in BITS. - -cg_bitstr_size(PutCode, Target, Temp, Fail, Live) -> - {Bits,Es} = cg_bitstr_size_1(PutCode, 0, []), - reverse(cg_gen_binsize(Es, Target, Temp, Fail, Live, - [{move,{integer,Bits},Target}])). - -cg_bitstr_size_1([{bs_put_utf8,_,_,Src}|Next], Bits, Acc) -> - cg_bitstr_size_1(Next, Bits, [{'*',{bs_utf8_size,Src},8}|Acc]); -cg_bitstr_size_1([{bs_put_utf16,_,_,Src}|Next], Bits, Acc) -> - cg_bitstr_size_1(Next, Bits, [{'*',{bs_utf16_size,Src},8}|Acc]); -cg_bitstr_size_1([{bs_put_utf32,_,_,_}|Next], Bits, Acc) -> - cg_bitstr_size_1(Next, Bits+32, Acc); -cg_bitstr_size_1([{_,_,S,U,_,Src}|Next], Bits, Acc) -> - case S of - {integer,N} -> cg_bitstr_size_1(Next, Bits+N*U, Acc); - {atom,all} -> cg_bitstr_size_1(Next, Bits, [{bit_size,Src}|Acc]); - _ when U =:= 1 -> cg_bitstr_size_1(Next, Bits, [S|Acc]); - _ -> cg_bitstr_size_1(Next, Bits, [{'*',S,U}|Acc]) - end; -cg_bitstr_size_1([], Bits, Acc) -> {Bits,Acc}. - -%% Generate code that calculate the size of the bitstr to be -%% built in BYTES or BITS (depending on what is easiest). - -cg_binary_size(PutCode, Target, Temp, Fail, Live) -> - {InitInstruction,Szs} = cg_binary_size_1(PutCode, 0, []), - SizeExpr = reverse(cg_gen_binsize(Szs, Target, Temp, Fail, Live, [{move,{integer,0},Target}])), - {InitInstruction,SizeExpr}. - -cg_binary_size_1([{bs_put_utf8,_Fail,_Flags,Src}|T], Bits, Acc) -> - cg_binary_size_1(T, Bits, [{8,{bs_utf8_size,Src}}|Acc]); -cg_binary_size_1([{bs_put_utf16,_Fail,_Flags,Src}|T], Bits, Acc) -> - cg_binary_size_1(T, Bits, [{8,{bs_utf16_size,Src}}|Acc]); -cg_binary_size_1([{bs_put_utf32,_Fail,_Flags,_Src}|T], Bits, Acc) -> - cg_binary_size_1(T, Bits+32, Acc); -cg_binary_size_1([{_Put,_Fail,S,U,_Flags,Src}|T], Bits, Acc) -> - cg_binary_size_2(S, U, Src, T, Bits, Acc); -cg_binary_size_1([], Bits, Acc) -> - Bytes = Bits div 8, - RemBits = Bits rem 8, - Sizes0 = sort([{1,{integer,RemBits}},{8,{integer,Bytes}}|Acc]), - Sizes = filter(fun({_,{integer,0}}) -> false; - (_) -> true end, Sizes0), - case Sizes of - [{1,_}|_] -> - {bs_init_bits,cg_binary_bytes_to_bits(Sizes, [])}; - [{8,_}|_] -> - {bs_init2,[E || {8,E} <- Sizes]}; - [] -> - {bs_init_bits,[]} - end. - -cg_binary_size_2({integer,N}, U, _, Next, Bits, Acc) -> - cg_binary_size_1(Next, Bits+N*U, Acc); -cg_binary_size_2({atom,all}, U, E, Next, Bits, Acc) -> - if - U rem 8 =:= 0 -> - cg_binary_size_1(Next, Bits, [{8,{byte_size,E}}|Acc]); - true -> - cg_binary_size_1(Next, Bits, [{1,{bit_size,E}}|Acc]) - end; -cg_binary_size_2(Reg, 1, _, Next, Bits, Acc) -> - cg_binary_size_1(Next, Bits, [{1,Reg}|Acc]); -cg_binary_size_2(Reg, 8, _, Next, Bits, Acc) -> - cg_binary_size_1(Next, Bits, [{8,Reg}|Acc]); -cg_binary_size_2(Reg, U, _, Next, Bits, Acc) -> - cg_binary_size_1(Next, Bits, [{1,{'*',Reg,U}}|Acc]). - -cg_binary_bytes_to_bits([{8,{integer,N}}|T], Acc) -> - cg_binary_bytes_to_bits(T, [{integer,8*N}|Acc]); -cg_binary_bytes_to_bits([{8,{byte_size,Reg}}|T], Acc) -> - cg_binary_bytes_to_bits(T, [{bit_size,Reg}|Acc]); -cg_binary_bytes_to_bits([{8,Reg}|T], Acc) -> - cg_binary_bytes_to_bits(T, [{'*',Reg,8}|Acc]); -cg_binary_bytes_to_bits([{1,Sz}|T], Acc) -> - cg_binary_bytes_to_bits(T, [Sz|Acc]); -cg_binary_bytes_to_bits([], Acc) -> - cg_binary_bytes_to_bits_1(sort(Acc)). - -cg_binary_bytes_to_bits_1([{integer,I},{integer,J}|T]) -> - cg_binary_bytes_to_bits_1([{integer,I+J}|T]); -cg_binary_bytes_to_bits_1([H|T]) -> - [H|cg_binary_bytes_to_bits_1(T)]; -cg_binary_bytes_to_bits_1([]) -> []. - -cg_gen_binsize([{'*',{bs_utf8_size,Src},B}|T], Target, Temp, Fail, Live, Acc) -> - Size = {bs_utf8_size,Fail,Src,Temp}, - Add = {bs_add,Fail,[Target,Temp,B],Target}, - cg_gen_binsize(T, Target, Temp, Fail, Live, - [Add,Size|Acc]); -cg_gen_binsize([{'*',{bs_utf16_size,Src},B}|T], Target, Temp, Fail, Live, Acc) -> - Size = {bs_utf16_size,Fail,Src,Temp}, - Add = {bs_add,Fail,[Target,Temp,B],Target}, - cg_gen_binsize(T, Target, Temp, Fail, Live, - [Add,Size|Acc]); -cg_gen_binsize([{'*',A,B}|T], Target, Temp, Fail, Live, Acc) -> - cg_gen_binsize(T, Target, Temp, Fail, Live, - [{bs_add,Fail,[Target,A,B],Target}|Acc]); -cg_gen_binsize([{bit_size,B}|T], Target, Temp, Fail, Live, Acc) -> - cg_gen_binsize([Temp|T], Target, Temp, Fail, Live, - [{gc_bif,bit_size,Fail,Live,[B],Temp}|Acc]); -cg_gen_binsize([{byte_size,B}|T], Target, Temp, Fail, Live, Acc) -> - cg_gen_binsize([Temp|T], Target, Temp, Fail, Live, - [{gc_bif,byte_size,Fail,Live,[B],Temp}|Acc]); -cg_gen_binsize([{bs_utf8_size,B}|T], Target, Temp, Fail, Live, Acc) -> - cg_gen_binsize([Temp|T], Target, Temp, Fail, Live, - [{bs_utf8_size,Fail,B,Temp}|Acc]); -cg_gen_binsize([{bs_utf16_size,B}|T], Target, Temp, Fail, Live, Acc) -> - cg_gen_binsize([Temp|T], Target, Temp, Fail, Live, - [{bs_utf16_size,Fail,B,Temp}|Acc]); -cg_gen_binsize([E0|T], Target, Temp, Fail, Live, Acc) -> - cg_gen_binsize(T, Target, Temp, Fail, Live, - [{bs_add,Fail,[Target,E0,1],Target}|Acc]); -cg_gen_binsize([], _, _, _, _, Acc) -> Acc. - - -%% cg_bin_opt(Code0) -> Code -%% Optimize the size calculations for binary construction. - -cg_bin_opt([{move,S1,{x,X}=D},{gc_bif,Op,Fail,Live0,As,Dst}|Is]) -> - Live = if - X + 1 =:= Live0 -> X; - true -> Live0 - end, - [{gc_bif,Op,Fail,Live,As,D}|cg_bin_opt([{move,S1,Dst}|Is])]; -cg_bin_opt([{move,_,_}=I1,{Op,_,_,_}=I2|Is]) - when Op =:= bs_utf8_size orelse Op =:= bs_utf16_size -> - [I2|cg_bin_opt([I1|Is])]; -cg_bin_opt([{bs_add,_,[{integer,0},Src,1],Dst}|Is]) -> - cg_bin_opt_1([{move,Src,Dst}|Is]); -cg_bin_opt([{bs_add,_,[Src,{integer,0},_],Dst}|Is]) -> - cg_bin_opt_1([{move,Src,Dst}|Is]); -cg_bin_opt(Is) -> - cg_bin_opt_1(Is). - -cg_bin_opt_1([{move,Size,D},{bs_append,Fail,D,Extra,Regs,U,Bin,Flags,D}|Is]) -> - [{bs_append,Fail,Size,Extra,Regs,U,Bin,Flags,D}|cg_bin_opt(Is)]; -cg_bin_opt_1([{move,Size,D},{bs_private_append,Fail,D,U,Bin,Flags,D}|Is]) -> - [{bs_private_append,Fail,Size,U,Bin,Flags,D}|cg_bin_opt(Is)]; -cg_bin_opt_1([{move,Size,D},{Op,Fail,D,Extra,Regs,Flags,D}|Is]) - when Op =:= bs_init2; Op =:= bs_init_bits -> - Bytes = case Size of - {integer,Int} -> Int; - _ -> Size - end, - [{Op,Fail,Bytes,Extra,Regs,Flags,D}|cg_bin_opt(Is)]; -cg_bin_opt_1([{move,S1,D},{bs_add,Fail,[D,S2,U],Dst}|Is]) -> - cg_bin_opt([{bs_add,Fail,[S1,S2,U],Dst}|Is]); -cg_bin_opt_1([{move,S1,D},{bs_add,Fail,[S2,D,U],Dst}|Is]) -> - cg_bin_opt([{bs_add,Fail,[S2,S1,U],Dst}|Is]); -cg_bin_opt_1([I|Is]) -> - [I|cg_bin_opt(Is)]; -cg_bin_opt_1([]) -> - []. - -cg_bin_put(#k_bin_seg{size=S0,unit=U,type=T,flags=Fs,seg=E0,next=Next}, - Fail, Bef) -> - S1 = cg_reg_arg(S0, Bef), - E1 = cg_reg_arg(E0, Bef), - {Format,Op} = case T of - integer -> {plain,bs_put_integer}; - utf8 -> {utf,bs_put_utf8}; - utf16 -> {utf,bs_put_utf16}; - utf32 -> {utf,bs_put_utf32}; - binary -> {plain,bs_put_binary}; - float -> {plain,bs_put_float} - end, - case Format of - plain -> - [{Op,Fail,S1,U,{field_flags,Fs},E1}|cg_bin_put(Next, Fail, Bef)]; - utf -> - [{Op,Fail,{field_flags,Fs},E1}|cg_bin_put(Next, Fail, Bef)] - end; -cg_bin_put(#k_bin_end{}, _, _) -> []. - -cg_build_args(As, Bef) -> - [{put,cg_reg_arg(A, Bef)} || A <- As]. - -%% return_cg([Val], Le, Vdb, Bef, St) -> {[Ainstr],Aft,St}. -%% break_cg([Val], Le, Vdb, Bef, St) -> {[Ainstr],Aft,St}. -%% These are very simple, just put return/break values in registers -%% from 0, then return/break. Use the call setup to clean up stack, -%% but must clear registers to ensure sr_merge works correctly. - -return_cg(Rs, Le, Vdb, Bef, St) -> - {Ms,Int} = cg_setup_call(Rs, Bef, Le#l.i, Vdb), - {Ms ++ [return],Int#sr{reg=clear_regs(Int#sr.reg)},St}. - -break_cg(Bs, Le, Vdb, Bef, St) -> - {Ms,Int} = cg_setup_call(Bs, Bef, Le#l.i, Vdb), - {Ms ++ [{jump,{f,St#cg.break}}], - Int#sr{reg=clear_regs(Int#sr.reg)},St}. - -guard_break_cg(Bs, #l{i=I}, Vdb, #sr{reg=Reg0}=Bef, St) -> - #sr{reg=Reg1} = Int = clear_dead(Bef, I, Vdb), - Reg2 = trim_free(Reg1), - NumLocked = length(Reg2), - Moves0 = gen_moves(Bs, Bef, NumLocked, []), - Moves = order_moves(Moves0, find_scratch_reg(Reg0)), - {BreakVars,_} = mapfoldl(fun(_, RegNum) -> - {{RegNum,gbreakvar},RegNum+1} - end, length(Reg2), Bs), - Reg = Reg2 ++ BreakVars, - Aft = Int#sr{reg=Reg}, - {Moves ++ [{jump,{f,St#cg.break}}],Aft,St}. - -%% cg_reg_arg(Arg0, Info) -> Arg -%% cg_reg_args([Arg0], Info) -> [Arg] -%% Convert argument[s] into registers. Literal values are returned unchanged. - -cg_reg_args(As, Bef) -> [cg_reg_arg(A, Bef) || A <- As]. - -cg_reg_arg(#k_var{name=V}, Bef) -> fetch_var(V, Bef); -cg_reg_arg(Literal, _) -> atomic(Literal). - -cg_reg_arg_prefer_y(#k_var{name=V}, Bef) -> fetch_var_prefer_y(V, Bef); -cg_reg_arg_prefer_y(Literal, _) -> atomic(Literal). - -%% cg_setup_call([Arg], Bef, Cur, Vdb) -> {[Instr],Aft}. -%% Do the complete setup for a call/enter. - -cg_setup_call(As, Bef, I, Vdb) -> - {Ms,Int0} = cg_call_args(As, Bef, I, Vdb), - %% Have set up arguments, can now clean up, compress and save to stack. - Int1 = Int0#sr{stk=clear_dead_stk(Int0#sr.stk, I, Vdb),res=[]}, - {Sis,Int2} = adjust_stack(Int1, I, I+1, Vdb), - {Ms ++ Sis,Int2}. - -%% cg_call_args([Arg], SrState) -> {[Instr],SrState}. -%% Setup the arguments to a call/enter/bif. Put the arguments into -%% consecutive registers starting at {x,0} moving any data which -%% needs to be saved. Return a modified SrState structure with the -%% new register contents. N.B. the resultant register info will -%% contain non-variable values when there are non-variable values. -%% -%% This routine is complicated by unsaved values in x registers. -%% We'll move away any unsaved values that are in the registers -%% to be overwritten by the arguments. - -cg_call_args(As, Bef, I, Vdb) -> - Regs0 = load_arg_regs(Bef#sr.reg, As), - Unsaved = unsaved_registers(Regs0, Bef#sr.stk, I, I+1, Vdb), - {UnsavedMoves,Regs} = move_unsaved(Unsaved, Bef#sr.reg, Regs0), - Moves0 = gen_moves(As, Bef), - Moves = order_moves(Moves0, find_scratch_reg(Regs)), - {UnsavedMoves ++ Moves,Bef#sr{reg=Regs}}. - -%% load_arg_regs([Reg], Arguments) -> [Reg] -%% Update the register descriptor to include the arguments (from {x,0} -%% and upwards). Values in argument register are overwritten. -%% Values in x registers above the arguments are preserved. - -load_arg_regs(Regs, As) -> load_arg_regs(Regs, As, 0). - -load_arg_regs([_|Rs], [#k_var{name=V}|As], I) -> [{I,V}|load_arg_regs(Rs, As, I+1)]; -load_arg_regs([_|Rs], [A|As], I) -> [{I,A}|load_arg_regs(Rs, As, I+1)]; -load_arg_regs([], [#k_var{name=V}|As], I) -> [{I,V}|load_arg_regs([], As, I+1)]; -load_arg_regs([], [A|As], I) -> [{I,A}|load_arg_regs([], As, I+1)]; -load_arg_regs(Rs, [], _) -> Rs. - -%% Returns the variables must be saved and are currently in the -%% x registers that are about to be overwritten by the arguments. - -unsaved_registers(Regs, Stk, Fb, Lf, Vdb) -> - [V || {V,F,L} <- Vdb, - F < Fb, - L >= Lf, - not on_stack(V, Stk), - not in_reg(V, Regs)]. - -in_reg(V, Regs) -> keymember(V, 2, Regs). - -%% Move away unsaved variables from the registers that are to be -%% overwritten by the arguments. -move_unsaved(Vs, OrigRegs, NewRegs) -> - move_unsaved(Vs, OrigRegs, NewRegs, []). - -move_unsaved([V|Vs], OrigRegs, NewRegs0, Acc) -> - NewRegs = put_reg(V, NewRegs0), - Src = fetch_reg(V, OrigRegs), - Dst = fetch_reg(V, NewRegs), - move_unsaved(Vs, OrigRegs, NewRegs, [{move,Src,Dst}|Acc]); -move_unsaved([], _, Regs, Acc) -> {Acc,Regs}. - -%% gen_moves(As, Sr) -%% Generate the basic move instruction to move the arguments -%% to their proper registers. The list will be sorted on -%% destinations. (I.e. the move to {x,0} will be first -- -%% see the comment to order_moves/2.) - -gen_moves(As, Sr) -> gen_moves(As, Sr, 0, []). - -gen_moves([#k_var{name=V}|As], Sr, I, Acc) -> - case fetch_var(V, Sr) of - {x,I} -> gen_moves(As, Sr, I+1, Acc); - Reg -> gen_moves(As, Sr, I+1, [{move,Reg,{x,I}}|Acc]) - end; -gen_moves([A0|As], Sr, I, Acc) -> - A = atomic(A0), - gen_moves(As, Sr, I+1, [{move,A,{x,I}}|Acc]); -gen_moves([], _, _, Acc) -> lists:keysort(3, Acc). - -%% order_moves([Move], ScratchReg) -> [Move] -%% Orders move instruction so that source registers are not -%% destroyed before they are used. If there are cycles -%% (such as {move,{x,0},{x,1}}, {move,{x,1},{x,1}}), -%% the scratch register is used to break up the cycle. -%% If possible, the first move of the input list is placed -%% last in the result list (to make the move to {x,0} occur -%% just before the call to allow the Beam loader to coalesce -%% the instructions). - -order_moves(Ms, Scr) -> order_moves(Ms, Scr, []). - -order_moves([{move,_,_}=M|Ms0], ScrReg, Acc0) -> - {Chain,Ms} = collect_chain(Ms0, [M], ScrReg), - Acc = reverse(Chain, Acc0), - order_moves(Ms, ScrReg, Acc); -order_moves([], _, Acc) -> Acc. - -collect_chain(Ms, Path, ScrReg) -> - collect_chain(Ms, Path, [], ScrReg). - -collect_chain([{move,Src,Same}=M|Ms0], [{move,Same,_}|_]=Path, Others, ScrReg) -> - case lists:keyfind(Src, 3, Path) of - false -> - collect_chain(reverse(Others, Ms0), [M|Path], [], ScrReg); - _ -> % We have a cycle. - {break_up_cycle(M, Path, ScrReg),reverse(Others, Ms0)} - end; -collect_chain([M|Ms], Path, Others, ScrReg) -> - collect_chain(Ms, Path, [M|Others], ScrReg); -collect_chain([], Path, Others, _) -> - {Path,Others}. - -break_up_cycle({move,Src,_}=M, Path, ScrReg) -> - [{move,ScrReg,Src},M|break_up_cycle1(Src, Path, ScrReg)]. - -break_up_cycle1(Dst, [{move,Src,Dst}|Path], ScrReg) -> - [{move,Src,ScrReg}|Path]; -break_up_cycle1(Dst, [M|Path], LastMove) -> - [M|break_up_cycle1(Dst, Path, LastMove)]. - -%% clear_dead(Sr, Until, Vdb) -> Aft. -%% Remove all variables in Sr which have died AT ALL so far. - -clear_dead(#sr{stk=Stk}=Sr0, Until, Vdb) -> - Sr = Sr0#sr{reg=clear_dead_reg(Sr0, Until, Vdb), - stk=clear_dead_stk(Stk, Until, Vdb)}, - reserve(Sr). - -clear_dead_reg(Sr, Until, Vdb) -> - [case R of - {_I,V} = IV -> - case vdb_find(V, Vdb) of - {V,_,L} when L > Until -> IV; - _ -> free %Remove anything else - end; - {reserved,_I,_V}=Reserved -> Reserved; - free -> free - end || R <- Sr#sr.reg]. - -clear_dead_stk(Stk, Until, Vdb) -> - [case S of - {V} = T -> - case vdb_find(V, Vdb) of - {V,_,L} when L > Until -> T; - _ -> dead %Remove anything else - end; - free -> free; - dead -> dead - end || S <- Stk]. - - -%% sr_merge(Sr1, Sr2) -> Sr. -%% Merge two stack/register states keeping the longest of both stack -%% and register. Perform consistency check on both, elements must be -%% the same. Allow frame size 'void' to make easy creation of -%% "empty" frame. - -sr_merge(#sr{reg=R1,stk=S1,res=[]}, #sr{reg=R2,stk=S2,res=[]}) -> - #sr{reg=longest(R1, R2),stk=longest(S1, S2),res=[]}; -sr_merge(void, S2) -> S2#sr{res=[]}. - -longest([H|T1], [H|T2]) -> [H|longest(T1, T2)]; -longest([dead|T1], [free|T2]) -> [dead|longest(T1, T2)]; -longest([free|T1], [dead|T2]) -> [dead|longest(T1, T2)]; -longest([dead|_] = L, []) -> L; -longest([], [dead|_] = L) -> L; -longest([free|_] = L, []) -> L; -longest([], [free|_] = L) -> L; -longest([], []) -> []. - -trim_free([R|Rs0]) -> - case {trim_free(Rs0),R} of - {[],free} -> []; - {Rs,R} -> [R|Rs] - end; -trim_free([]) -> []. - -%% maybe_adjust_stack(Bef, FirstBefore, LastFrom, Vdb, St) -> {[Ainstr],Aft}. -%% Adjust the stack, but only if the code is inside a catch and not -%% inside a guard. Use this funtion before instructions that may -%% cause an exception. - -maybe_adjust_stack(Bef, Fb, Lf, Vdb, St) -> - case St of - #cg{in_catch=true,bfail=0} -> - adjust_stack(Bef, Fb, Lf, Vdb); - #cg{} -> - {[],Bef} - end. - -%% adjust_stack(Bef, FirstBefore, LastFrom, Vdb) -> {[Ainstr],Aft}. -%% Do complete stack adjustment by compressing stack and adding -%% variables to be saved. Try to optimise ordering on stack by -%% having reverse order to their lifetimes. -%% -%% In Beam, there is a fixed stack frame and no need to do stack compression. - -adjust_stack(Bef, Fb, Lf, Vdb) -> - Stk0 = Bef#sr.stk, - {Stk1,Saves} = save_stack(Stk0, Fb, Lf, Vdb), - {saves(Saves, Bef#sr.reg, Stk1), - Bef#sr{stk=Stk1}}. - -%% save_stack(Stack, FirstBefore, LastFrom, Vdb) -> {[SaveVar],NewStack}. -%% Save variables which are used past current point and which are not -%% already on the stack. - -save_stack(Stk0, Fb, Lf, Vdb) -> - %% New variables that are in use but not on stack. - New = new_not_on_stack(Stk0, Fb, Lf, Vdb), - - %% Add new variables that are not just dropped immediately. - %% N.B. foldr works backwards from the end!! - Saves = [V || {V,_,_} <- keysort(3, New)], - Stk1 = foldr(fun (V, Stk) -> put_stack(V, Stk) end, Stk0, Saves), - {Stk1,Saves}. - -%% new_not_on_stack(Stack, FirstBefore, LastFrom, Vdb) -> -%% [{Variable,First,Last}] -%% Return information about all variables that are used past current -%% point and that are not already on the stack. - -new_not_on_stack(Stk, Fb, Lf, Vdb) -> - [VFL || {V,F,L} = VFL <- Vdb, - F < Fb, - L >= Lf, - not on_stack(V, Stk)]. - -%% saves([SaveVar], Reg, Stk) -> [{move,Reg,Stk}]. -%% Generate move instructions to save variables onto stack. The -%% stack/reg info used is that after the new stack has been made. - -saves(Ss, Reg, Stk) -> - [{move,fetch_reg(V, Reg),fetch_stack(V, Stk)} || V <- Ss]. - -%% fetch_var(VarName, StkReg) -> r{R} | sp{Sp}. -%% find_var(VarName, StkReg) -> ok{r{R} | sp{Sp}} | error. -%% Fetch/find a variable in either the registers or on the -%% stack. Fetch KNOWS it's there. - -fetch_var(V, Sr) -> - case find_reg(V, Sr#sr.reg) of - {ok,R} -> R; - error -> fetch_stack(V, Sr#sr.stk) - end. - -fetch_var_prefer_y(V, #sr{reg=Reg,stk=Stk}) -> - case find_stack(V, Stk) of - {ok,R} -> R; - error -> fetch_reg(V, Reg) - end. - -load_vars(Vs, Regs) -> - foldl(fun (#k_var{name=V}, Rs) -> put_reg(V, Rs) end, Regs, Vs). - -%% put_reg(Val, Regs) -> Regs. -%% find_reg(Val, Regs) -> {ok,r{R}} | error. -%% fetch_reg(Val, Regs) -> r{R}. -%% Functions to interface the registers. - -% put_regs(Vs, Rs) -> foldl(fun put_reg/2, Rs, Vs). - -put_reg(V, Rs) -> put_reg_1(V, Rs, 0). - -put_reg_1(V, [free|Rs], I) -> [{I,V}|Rs]; -put_reg_1(V, [{reserved,I,V}|Rs], I) -> [{I,V}|Rs]; -put_reg_1(V, [R|Rs], I) -> [R|put_reg_1(V, Rs, I+1)]; -put_reg_1(V, [], I) -> [{I,V}]. - -fetch_reg(V, [{I,V}|_]) -> {x,I}; -fetch_reg(V, [_|SRs]) -> fetch_reg(V, SRs). - -find_reg(V, [{I,V}|_]) -> {ok,{x,I}}; -find_reg(V, [_|SRs]) -> find_reg(V, SRs); -find_reg(_, []) -> error. - -%% For the bit syntax, we need a scratch register if we are constructing -%% a binary that will not be used. - -find_scratch_reg(Rs) -> find_scratch_reg(Rs, 0). - -find_scratch_reg([free|_], I) -> {x,I}; -find_scratch_reg([_|Rs], I) -> find_scratch_reg(Rs, I+1); -find_scratch_reg([], I) -> {x,I}. - -replace_reg_contents(Old, New, [{I,Old}|Rs]) -> [{I,New}|Rs]; -replace_reg_contents(Old, New, [R|Rs]) -> [R|replace_reg_contents(Old, New, Rs)]. - -%%clear_regs(Regs) -> map(fun (R) -> free end, Regs). -clear_regs(_) -> []. - -max_reg(Regs) -> - foldl(fun ({I,_}, _) -> I; - (_, Max) -> Max end, - -1, Regs) + 1. - -%% put_stack(Val, [{Val}]) -> [{Val}]. -%% fetch_stack(Var, Stk) -> sp{S}. -%% find_stack(Var, Stk) -> ok{sp{S}} | error. -%% Functions to interface the stack. - -put_stack(Val, []) -> [{Val}]; -put_stack(Val, [dead|Stk]) -> [{Val}|Stk]; -put_stack(Val, [free|Stk]) -> [{Val}|Stk]; -put_stack(Val, [NotFree|Stk]) -> [NotFree|put_stack(Val, Stk)]. - -put_stack_carefully(Val, Stk0) -> - try - put_stack_carefully1(Val, Stk0) - catch - throw:error -> - error - end. - -put_stack_carefully1(_, []) -> throw(error); -put_stack_carefully1(Val, [dead|Stk]) -> [{Val}|Stk]; -put_stack_carefully1(Val, [free|Stk]) -> [{Val}|Stk]; -put_stack_carefully1(Val, [NotFree|Stk]) -> - [NotFree|put_stack_carefully1(Val, Stk)]. - -fetch_stack(Var, Stk) -> fetch_stack(Var, Stk, 0). - -fetch_stack(V, [{V}|_], I) -> {yy,I}; -fetch_stack(V, [_|Stk], I) -> fetch_stack(V, Stk, I+1). - -find_stack(Var, Stk) -> find_stack(Var, Stk, 0). - -find_stack(V, [{V}|_], I) -> {ok,{yy,I}}; -find_stack(V, [_|Stk], I) -> find_stack(V, Stk, I+1); -find_stack(_, [], _) -> error. - -on_stack(V, Stk) -> keymember(V, 1, Stk). - -%% put_catch(CatchTag, Stack) -> Stack' -%% drop_catch(CatchTag, Stack) -> Stack' -%% Special interface for putting and removing catch tags, to ensure that -%% catches nest properly. Also used for try tags. - -put_catch(Tag, Stk0) -> put_catch(Tag, reverse(Stk0), []). - -put_catch(Tag, [], Stk) -> - put_stack({catch_tag,Tag}, Stk); -put_catch(Tag, [{{catch_tag,_}}|_]=RevStk, Stk) -> - reverse(RevStk, put_stack({catch_tag,Tag}, Stk)); -put_catch(Tag, [Other|Stk], Acc) -> - put_catch(Tag, Stk, [Other|Acc]). - -drop_catch(Tag, [{{catch_tag,Tag}}|Stk]) -> [free|Stk]; -drop_catch(Tag, [Other|Stk]) -> [Other|drop_catch(Tag, Stk)]. - -%% atomic(Klit) -> Lit. -%% atomic_list([Klit]) -> [Lit]. - -atomic(#k_literal{val=V}) -> {literal,V}; -atomic(#k_int{val=I}) -> {integer,I}; -atomic(#k_float{val=F}) -> {float,F}; -atomic(#k_atom{val=A}) -> {atom,A}; -%%atomic(#k_char{val=C}) -> {char,C}; -atomic(#k_nil{}) -> nil. - -%% new_label(St) -> {L,St}. - -new_label(#cg{lcount=Next}=St) -> - {Next,St#cg{lcount=Next+1}}. - -%% line(Le) -> {line,[] | {location,File,Line}} -%% Create a line instruction, containing information about -%% the current filename and line number. A line information -%% instruction should be placed before any operation that could -%% cause an exception. - -line(#l{a=Anno}) -> - line(Anno); -line([Line,{file,Name}]) when is_integer(Line) -> - line_1(Name, Line); -line([_|_]=A) -> - {Name,Line} = find_loc(A, no_file, 0), - line_1(Name, Line); -line([]) -> - {line,[]}. - -line_1(no_file, _) -> - {line,[]}; -line_1(_, 0) -> - %% Missing line number or line number 0. - {line,[]}; -line_1(Name, Line) -> - {line,[{location,Name,Line}]}. - -find_loc([Line|T], File, _) when is_integer(Line) -> - find_loc(T, File, Line); -find_loc([{file,File}|T], _, Line) -> - find_loc(T, File, Line); -find_loc([_|T], File, Line) -> - find_loc(T, File, Line); -find_loc([], File, Line) -> {File,Line}. - -flatmapfoldl(F, Accu0, [Hd|Tail]) -> - {R,Accu1} = F(Hd, Accu0), - {Rs,Accu2} = flatmapfoldl(F, Accu1, Tail), - {R++Rs,Accu2}; -flatmapfoldl(_, Accu, []) -> {[],Accu}. - -%% Keep track of life time for variables. -%% -%% init_vars([{var,VarName}]) -> Vdb. -%% new_vars([VarName], I, Vdb) -> Vdb. -%% use_vars([VarName], I, Vdb) -> Vdb. -%% add_var(VarName, F, L, Vdb) -> Vdb. -%% -%% The list of variable names for new_vars/3 and use_vars/3 -%% must be sorted. - -init_vars(Vs) -> - vdb_new(Vs). - -new_vars([], _, Vdb) -> Vdb; -new_vars([V], I, Vdb) -> vdb_store_new(V, {V,I,I}, Vdb); -new_vars(Vs, I, Vdb) -> vdb_update_vars(Vs, Vdb, I). - -use_vars([], _, Vdb) -> - Vdb; -use_vars([V], I, Vdb) -> - case vdb_find(V, Vdb) of - {V,F,L} when I > L -> vdb_update(V, {V,F,I}, Vdb); - {V,_,_} -> Vdb; - error -> vdb_store_new(V, {V,I,I}, Vdb) - end; -use_vars(Vs, I, Vdb) -> vdb_update_vars(Vs, Vdb, I). - -add_var(V, F, L, Vdb) -> - vdb_store_new(V, {V,F,L}, Vdb). - -%% vdb - -vdb_new(Vs) -> - ordsets:from_list([{V,0,0} || #k_var{name=V} <- Vs]). - --type var() :: atom(). - --spec vdb_find(var(), [vdb_entry()]) -> 'error' | vdb_entry(). - -vdb_find(V, Vdb) -> - case lists:keyfind(V, 1, Vdb) of - false -> error; - Vd -> Vd - end. - -vdb_update(V, Update, [{V,_,_}|Vdb]) -> - [Update|Vdb]; -vdb_update(V, Update, [Vd|Vdb]) -> - [Vd|vdb_update(V, Update, Vdb)]. - -vdb_store_new(V, New, [{V1,_,_}=Vd|Vdb]) when V > V1 -> - [Vd|vdb_store_new(V, New, Vdb)]; -vdb_store_new(V, New, [{V1,_,_}|_]=Vdb) when V < V1 -> - [New|Vdb]; -vdb_store_new(_, New, []) -> [New]. - -vdb_update_vars([V|_]=Vs, [{V1,_,_}=Vd|Vdb], I) when V > V1 -> - [Vd|vdb_update_vars(Vs, Vdb, I)]; -vdb_update_vars([V|Vs], [{V1,_,_}|_]=Vdb, I) when V < V1 -> - %% New variable. - [{V,I,I}|vdb_update_vars(Vs, Vdb, I)]; -vdb_update_vars([V|Vs], [{_,F,L}=Vd|Vdb], I) -> - %% Existing variable. - if - I > L -> [{V,F,I}|vdb_update_vars(Vs, Vdb, I)]; - true -> [Vd|vdb_update_vars(Vs, Vdb, I)] - end; -vdb_update_vars([V|Vs], [], I) -> - %% New variable. - [{V,I,I}|vdb_update_vars(Vs, [], I)]; -vdb_update_vars([], Vdb, _) -> Vdb. - -%% vdb_sub(Min, Max, Vdb) -> Vdb. -%% Extract variables which are used before and after Min. Lock -%% variables alive after Max. - -vdb_sub(Min, Max, Vdb) -> - [ if L >= Max -> {V,F,locked}; - true -> Vd - end || {V,F,L}=Vd <- Vdb, - F < Min, - L >= Min ]. -- cgit v1.2.3