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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% 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/1 :: ([_]) -> bb()).
mk_bb(Code) ->
#bb{code=Code}.
-spec(is_bb/1 :: (_) -> bool()).
is_bb(#bb{}) -> true;
is_bb(_) -> false.
-spec(code_update/2 :: (bb(), [_]) -> bb()).
code_update(BB, Code) ->
BB#bb{code = Code}.
-spec(code/1 :: (bb()) -> [_]).
code(#bb{code = Code}) ->
Code.
-spec(last/1 :: (bb()) -> _).
last(#bb{code = Code}) ->
lists:last(Code).
-spec(butlast/1 :: (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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