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_varmap.erl | 161 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 lib/hipe/rtl/hipe_rtl_varmap.erl

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

diff --git a/lib/hipe/rtl/hipe_rtl_varmap.erl b/lib/hipe/rtl/hipe_rtl_varmap.erl
new file mode 100644
index 0000000000..9bd5e88611
--- /dev/null
+++ b/lib/hipe/rtl/hipe_rtl_varmap.erl
@@ -0,0 +1,161 @@
+%% -*- erlang-indent-level: 2 -*-
+%%
+%% %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%
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Copyright (c) 2001 by Erik Johansson.  All Rights Reserved 
+%% Time-stamp: <2008-04-20 14:55:35 richard>
+%% ====================================================================
+%%  Module   :	hipe_rtl_varmap
+%%  Purpose  :  
+%%  Notes    : 
+%%  History  :	* 2001-04-10 Erik Johansson (happi@it.uu.se): Created.
+%% ====================================================================
+%%  Exports  :
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+-module(hipe_rtl_varmap).
+
+-export([init/1,
+	 ivs2rvs/2,
+	 icode_var2rtl_var/2,
+	 icode_label2rtl_label/2]).
+
+%-------------------------------------------------------------------------
+
+-include("../main/hipe.hrl").
+-include("../icode/hipe_icode.hrl").
+
+%-------------------------------------------------------------------------
+
+%% @spec init(IcodeRecord::#icode{}) -> {Args, VarMap}
+%%
+%% @doc Initializes gensym for RTL.
+
+-spec init(#icode{}) -> {[_], _}.  % XXX: fix me please
+
+init(IcodeRecord) ->
+  hipe_gensym:init(rtl),
+  hipe_gensym:set_var(rtl, hipe_rtl_arch:first_virtual_reg()),
+  hipe_gensym:set_label(rtl, 0),
+  VarMap = new_var_map(),
+  {_Args, _VarMap1} = ivs2rvs(hipe_icode:icode_params(IcodeRecord), VarMap).
+
+
+%%------------------------------------------------------------------------
+%%
+%% Mapping of labels and variables from Icode to RTL.
+%%
+%%------------------------------------------------------------------------
+
+
+%% @spec icode_label2rtl_label(Icode_Label::term(), LabelMap::term()) ->
+%%           {RTL_Label, NewLabelMap}
+%%
+%% @doc Converts an Icode label to an RTL label.
+
+icode_label2rtl_label(LabelName, Map) ->
+  case lookup(LabelName, Map) of
+    {value, NewLabel} ->
+      {NewLabel, Map};
+    none ->
+      NewLabel = hipe_rtl:mk_new_label(),
+      {NewLabel, insert(LabelName, NewLabel, Map)}
+  end.
+
+
+%% @spec ivs2rvs(Icode_Vars::[term()], VarMap::term()) -> {[RTL_Var],NewVarMap}
+%%
+%% @doc Converts a list of Icode variables to a list of RTL variables.
+
+ivs2rvs([], VarMap) ->
+  {[], VarMap};
+ivs2rvs([V|Vs], VarMap) ->
+  {NewV, VarMap0} = icode_var2rtl_var(V, VarMap),
+  {NewVs, VarMap1} = ivs2rvs(Vs, VarMap0),
+  {[NewV|NewVs], VarMap1}.
+
+
+%% @spec icode_var2rtl_var(Icode_Var::term(), VarMap::term()) ->
+%%           {RTL_Var, NewVarMap}
+%%
+%% @doc Converts an Icode variable to an RTL variable.
+
+icode_var2rtl_var(Var, Map) ->
+  Value = lookup(Var, Map),
+  case Value of
+    none ->
+      case type_of_var(Var) of
+	fvar ->
+	  NewVar = hipe_rtl:mk_new_fpreg(),
+	  {NewVar, insert(Var, NewVar, Map)};
+	var ->
+	  NewVar = hipe_rtl:mk_new_var(),
+	  {NewVar, insert(Var, NewVar, Map)};
+	{reg, IsGcSafe} ->
+	  NewVar =
+	    case IsGcSafe of
+	      %% true -> hipe_rtl:mk_new_reg_gcsafe();
+	      false -> hipe_rtl:mk_new_reg()
+	    end,
+	  {NewVar, insert(Var, NewVar, Map)}
+      end;
+    {value, NewVar} ->
+      {NewVar, Map}
+  end.
+
+%%
+%% Simple type test
+%%
+
+type_of_var(X) ->
+  case hipe_icode:is_fvar(X) of
+    true ->
+      fvar;
+    false ->
+      case hipe_icode:is_var(X) of
+	true ->
+	  var;
+	false ->
+	  case hipe_icode:is_reg(X) of
+	    true ->
+	      {reg, hipe_icode:reg_is_gcsafe(X)};
+	    false ->
+	      %% Sanity check
+	      case hipe_icode:is_const(X) of
+		true -> const;
+		false ->
+		  exit({"Unknown Icode variable", X})
+	      end
+	  end
+      end
+  end.
+
+%%
+%% Helping utilities
+%% 
+
+new_var_map() ->
+  gb_trees:empty().
+
+lookup(V, Map) ->
+  gb_trees:lookup(V, Map).
+
+insert(Key, Val, Map) ->
+  gb_trees:insert(Key, Val, Map).
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