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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2001-2009. 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%
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Basic Block Module
%%
%% Exports:
%% ~~~~~~~~
%% mk_bb(Code) - construct a basic block.
%% code(BB) - returns the code.
%% code_update(BB, NewCode) - replace the code in a basic block.
%% last(BB) - returns the last instruction.
%% butlast(BB) - returns the code with the last instruction removed.
%%
-module(hipe_bb).
-export([mk_bb/1,
code/1,
code_update/2,
is_bb/1,
last/1,
butlast/1]).
-include("hipe_bb.hrl").
%%
%% Constructs a basic block.
%% Returns a basic block: {bb, Code}
%% * Code is a list of instructions
-spec mk_bb([_]) -> bb().
mk_bb(Code) ->
#bb{code=Code}.
-spec is_bb(_) -> boolean().
is_bb(#bb{}) -> true;
is_bb(_) -> false.
-spec code_update(bb(), [_]) -> bb().
code_update(BB, Code) ->
BB#bb{code = Code}.
-spec code(bb()) -> [_].
code(#bb{code = Code}) ->
Code.
-spec last(bb()) -> _.
last(#bb{code = Code}) ->
lists:last(Code).
-spec butlast(bb()) -> [_].
butlast(#bb{code = Code}) ->
butlast_1(Code).
butlast_1([X|Xs]) -> butlast_1(Xs,X).
butlast_1([X|Xs],Y) -> [Y|butlast_1(Xs,X)];
butlast_1([],_) -> [].
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