1 files changed, 81 insertions, 0 deletions
diff --git a/lib/hipe/flow/hipe_bb.erl b/lib/hipe/flow/hipe_bb.erl
new file mode 100644
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+++ b/lib/hipe/flow/hipe_bb.erl
@@ -0,0 +1,81 @@
+%%
+%% %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([],_) -> [].