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%% -*- erlang-indent-level: 2 -*-
%%=============================================================================
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2003-2014. 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%
%%
-module(hipe_pack_constants).
-export([pack_constants/2, slim_refs/1, slim_constmap/1]).
-include("hipe_consttab.hrl").
-include("../../kernel/src/hipe_ext_format.hrl").
%%-----------------------------------------------------------------------------
-type raw_data() :: binary() | number() | list() | tuple().
-type tbl_ref() :: {hipe_constlbl(), non_neg_integer()}.
-record(pcm_entry, {mfa :: mfa(),
label :: hipe_constlbl(),
const_num :: non_neg_integer(),
start :: non_neg_integer(),
type :: 0 | 1 | 2,
raw_data :: raw_data()}).
%%-----------------------------------------------------------------------------
-spec pack_constants([{mfa(),[_],hipe_consttab()}], ct_alignment()) ->
{ct_alignment(),
non_neg_integer(),
[#pcm_entry{}],
[{mfa(),[tbl_ref() | {'sorted',non_neg_integer(),[tbl_ref()]}]}]}.
pack_constants(Data, Align) ->
pack_constants(Data, 0, Align, 0, [], []).
pack_constants([{MFA,_,ConstTab}|Rest], Size, Align, ConstNo, Acc, Refs) ->
Labels = hipe_consttab:labels(ConstTab),
%% RefToLabels = hipe_consttab:referred_labels(ConstTab),
{NewSize, NewAlign, Map, NewConstNo, RefToLabels} =
pack_labels(Labels, MFA, ConstTab, Size, Align, ConstNo, Acc, []),
NewRefs =
case RefToLabels of
[] -> Refs;
_ -> [{MFA,RefToLabels}|Refs]
end,
pack_constants(Rest, NewSize, NewAlign, NewConstNo, Map, NewRefs);
pack_constants([], Size, Align, _, Acc, Refs) ->
{Align, Size, Acc, Refs}.
%%
%% pack_labels converts a ConstTab to a packed ConstMap, which
%% maps {MFA,Label} pairs to information about individual constants,
%% including their ConstNo and start offset in the constants pool.
%%
pack_labels([{_Label,ref}|Labels],MFA,ConstTab,Size,Align,ConstNo,Acc, Refs) ->
pack_labels(Labels, MFA, ConstTab, Size, Align, ConstNo, Acc, Refs);
pack_labels([Label|Labels],MFA,ConstTab,AccSize,OldAlign,ConstNo, Acc, Refs) ->
Const = hipe_consttab:lookup(Label, ConstTab),
Align = hipe_consttab:const_align(Const),
NewAlign = erlang:max(Align, OldAlign),
Start =
case AccSize rem Align of
0 -> AccSize;
N -> AccSize + (Align - N)
end,
%% io:format("Const ~w\n", [Const]),
RawType = hipe_consttab:const_type(Const),
Type = ?CONST_TYPE2EXT(RawType),
RawData = hipe_consttab:const_data(Const),
case RawType of
term ->
%% If the constant term is already in the constant map we want
%% to use the same constant number so that, in the end, the
%% constant term is not duplicated.
case lists:keyfind(RawData, 7, Acc) of
false ->
NewInfo = #pcm_entry{mfa=MFA, label=Label, const_num=ConstNo,
start=0, type=Type, raw_data=RawData},
pack_labels(Labels, MFA, ConstTab, AccSize, OldAlign, ConstNo+1,
[NewInfo|Acc], Refs);
#pcm_entry{const_num=OtherConstNo, type=Type, raw_data=RawData} ->
NewInfo = #pcm_entry{mfa=MFA, label=Label, const_num=OtherConstNo,
start=0, type=Type, raw_data=RawData},
pack_labels(Labels, MFA, ConstTab, AccSize, OldAlign, ConstNo,
[NewInfo|Acc], Refs);
_ ->
NewInfo = #pcm_entry{mfa=MFA, label=Label, const_num=ConstNo,
start=0, type=Type, raw_data=RawData},
pack_labels(Labels, MFA, ConstTab, AccSize, OldAlign, ConstNo+1,
[NewInfo|Acc], Refs)
end;
sorted_block ->
Need = hipe_consttab:const_size(Const),
NewInfo = #pcm_entry{mfa=MFA, label=Label, const_num=ConstNo,
start=Start, type=Type, raw_data=RawData},
pack_labels(Labels, MFA, ConstTab, Start+Need, NewAlign, ConstNo+1,
[NewInfo|Acc], Refs);
block ->
Need = hipe_consttab:const_size(Const),
{Data, NewRefs} =
case RawData of
{ElementType, ElementData} ->
decompose_block(ElementType, ElementData, Start);
{ElementType, ElementData, SortOrder} ->
{TblData, TblRefs} = get_sorted_refs(ElementData, SortOrder),
{hipe_consttab:decompose({ElementType, TblData}),
[{sorted,Start,TblRefs}]}
end,
NewInfo = #pcm_entry{mfa=MFA, label=Label, const_num=ConstNo,
start=Start, type=Type, raw_data=Data},
pack_labels(Labels, MFA, ConstTab, Start+Need, NewAlign, ConstNo+1,
[NewInfo|Acc], NewRefs++Refs)
end;
pack_labels([], _, _, Size, Align, ConstNo, Acc, Refs) ->
{Size, Align, Acc, ConstNo, Refs}.
decompose_block(ElementType, Data, Addr) ->
ElementSize = hipe_consttab:size_of(ElementType),
{NewData, Refs} = get_refs(Data, Addr, ElementSize),
{hipe_consttab:decompose({ElementType, NewData}), Refs}.
get_refs([{label,L}|Rest], Pos, ElementSize) ->
{NewData, Refs} = get_refs(Rest, Pos+ElementSize, ElementSize),
{[0|NewData], [{L,Pos}|Refs]};
get_refs([D|Rest], Pos, ElementSize) ->
{NewData, Refs} = get_refs(Rest, Pos+ElementSize, ElementSize),
{[D|NewData], Refs};
get_refs([], _, _) ->
{[],[]}.
get_sorted_refs([{label,L}|Rest], [Ordering|Os]) ->
{NewData, Refs} = get_sorted_refs(Rest, Os),
{[0|NewData], [{L,Ordering}|Refs]};
get_sorted_refs([D|Rest], [_Ordering|Os]) ->
{NewData, Refs} = get_sorted_refs(Rest, Os),
{[D|NewData], Refs};
get_sorted_refs([], []) ->
{[], []}.
-type ref_type() :: 0..4.
-spec slim_refs([{ref_type(),non_neg_integer(),term()}]) ->
[{ref_type(), [{term(), [non_neg_integer()]}]}].
slim_refs([]) -> [];
slim_refs(Refs) ->
[Ref|Rest] = lists:keysort(1, Refs),
compact_ref_types(Rest, element(1, Ref), [Ref], []).
compact_ref_types([Ref|Refs], Type, AccofType, Acc) ->
case element(1, Ref) of
Type ->
compact_ref_types(Refs, Type, [Ref|AccofType], Acc);
NewType ->
compact_ref_types(Refs, NewType, [Ref],
[{Type,lists:sort(compact_dests(AccofType))}|Acc])
end;
compact_ref_types([], Type, AccofType ,Acc) ->
[{Type,lists:sort(compact_dests(AccofType))}|Acc].
%% compact_dests([]) -> []; % clause is redundant
compact_dests(Refs) ->
[Ref|Rest] = lists:keysort(3, Refs),
compact_dests(Rest, element(3,Ref), [element(2,Ref)], []).
compact_dests([Ref|Refs], Dest, AccofDest, Acc) ->
case element(3, Ref) of
Dest ->
compact_dests(Refs, Dest, [element(2,Ref)|AccofDest], Acc);
NewDest ->
compact_dests(Refs, NewDest, [element(2,Ref)], [{Dest,AccofDest}|Acc])
end;
compact_dests([], Dest, AccofDest, Acc) ->
[{Dest,AccofDest}|Acc].
%%
%% slim_constmap/1 takes a packed ConstMap, as produced by pack_labels
%% called from hipe_pack_constants:pack_constants/2, and converts it
%% to the slimmed and flattened format ConstMap which is put in object
%% files.
%%
-spec slim_constmap([#pcm_entry{}]) -> [raw_data()].
slim_constmap(Map) ->
slim_constmap(Map, gb_sets:new(), []).
-spec slim_constmap([#pcm_entry{}], gb_sets:set(), [raw_data()]) -> [raw_data()].
slim_constmap([#pcm_entry{const_num=ConstNo, start=Offset,
type=Type, raw_data=Term}|Rest], Inserted, Acc) ->
case gb_sets:is_member(ConstNo, Inserted) of
true ->
slim_constmap(Rest, Inserted, Acc);
false ->
NewInserted = gb_sets:insert(ConstNo, Inserted),
slim_constmap(Rest, NewInserted, [ConstNo, Offset, Type, Term|Acc])
end;
slim_constmap([], _Inserted, Acc) -> Acc.
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