From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/hipe/rtl/hipe_rtl_liveness.erl | 145 +++++++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 lib/hipe/rtl/hipe_rtl_liveness.erl

(limited to 'lib/hipe/rtl/hipe_rtl_liveness.erl')

diff --git a/lib/hipe/rtl/hipe_rtl_liveness.erl b/lib/hipe/rtl/hipe_rtl_liveness.erl
new file mode 100644
index 0000000000..3cfada9d6c
--- /dev/null
+++ b/lib/hipe/rtl/hipe_rtl_liveness.erl
@@ -0,0 +1,145 @@
+%% $Id$
+%%
+%% %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%
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%
+%% LIVENESS ANALYSIS
+%%
+%% Exports:
+%% ~~~~~~~
+%% analyze(CFG) - returns a liveness analysis of CFG.
+%% liveout(Liveness, Label) - returns a set of variables that are live on
+%%      exit from basic block named Label.
+%% livein(Liveness, Label) - returns a set of variables that are live on
+%%      entry to the basic block named Label.
+%% list(Instructions, LiveOut) - Given a list of instructions and a liveout
+%%      set, returns a set of variables live at the first instruction.
+%%
+
+-module(hipe_rtl_liveness).
+
+%% -define(LIVEOUT_NEEDED,true).	% needed for liveness.inc below.
+-define(PRETTY_PRINT,false).
+
+-include("hipe_rtl.hrl").
+-include("../flow/liveness.inc").
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%
+%% Interface to CFG and RTL.
+%%
+
+cfg_bb(CFG, L) ->
+   hipe_rtl_cfg:bb(CFG, L).
+
+cfg_postorder(CFG) ->
+   hipe_rtl_cfg:postorder(CFG).
+
+cfg_succ(CFG, L) ->
+   hipe_rtl_cfg:succ(CFG, L).
+
+uses(Instr) ->
+  hipe_rtl:uses(Instr).
+
+defines(Instr) ->
+  hipe_rtl:defines(Instr).
+
+%%
+%% This is the list of registers that are live at exit from a function
+%%
+
+liveout_no_succ() ->
+  hipe_rtl_arch:live_at_return().
+
+%%
+%% The following are used only if annotation of the code is requested.
+%%
+
+cfg_labels(CFG) ->
+   hipe_rtl_cfg:reverse_postorder(CFG).
+
+pp_block(Label, CFG) ->
+  BB=hipe_rtl_cfg:bb(CFG, Label),
+  Code=hipe_bb:code(BB),
+  hipe_rtl:pp_block(Code).
+
+pp_liveness_info(LiveList) ->
+  NewList=remove_precoloured(LiveList),
+  print_live_list(NewList).
+
+print_live_list([]) ->
+  io:format(" none~n", []);
+print_live_list([Last]) ->
+  io:format(" ", []),
+  print_var(Last),
+  io:format("~n", []);
+print_live_list([Var|Rest]) ->
+  io:format(" ", []),
+  print_var(Var),
+  io:format(",", []), 
+  print_live_list(Rest).
+
+print_var(A) ->
+  case hipe_rtl:is_var(A) of
+    true -> 
+      pp_var(A);
+    false ->
+      case hipe_rtl:is_reg(A) of
+	true ->
+	  pp_reg(A);
+	false ->
+	  case hipe_rtl:is_fpreg(A) of
+	    true ->
+	      io:format("f~w", [hipe_rtl:fpreg_index(A)]);
+	    false ->
+	      io:format("unknown:~w", [A])
+	  end
+      end
+  end.
+
+pp_hard_reg(N) ->
+  io:format("~s", [hipe_rtl_arch:reg_name(N)]).
+
+pp_reg(Arg) ->
+  case hipe_rtl_arch:is_precoloured(Arg) of
+    true ->
+      pp_hard_reg(hipe_rtl:reg_index(Arg));
+    false ->
+      io:format("r~w", [hipe_rtl:reg_index(Arg)])
+  end.
+
+pp_var(Arg) ->
+  case hipe_rtl_arch:is_precoloured(Arg) of
+    true ->
+      pp_hard_reg(hipe_rtl:var_index(Arg));
+    false ->
+      io:format("v~w", [hipe_rtl:var_index(Arg)])
+  end.	      
+
+remove_precoloured(List) ->
+  List.  
+  %% [X || X <- List, not hipe_rtl_arch:is_precoloured(X)].
+
+-ifdef(DEBUG_LIVENESS).
+cfg_bb_add(CFG, L, NewBB) ->
+  hipe_rtl_cfg:bb_add(CFG, L, NewBB).
+
+mk_comment(Text) ->
+  hipe_rtl:mk_comment(Text).
+-endif.
-- 
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