1 /*
   2  * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.phases.common;
  24 
  25 import org.graalvm.compiler.graph.Node;
  26 import org.graalvm.compiler.nodes.StructuredGraph;
  27 import org.graalvm.compiler.nodes.ValueNode;
  28 import org.graalvm.compiler.nodes.memory.address.AddressNode;
  29 import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode;
  30 import org.graalvm.compiler.nodes.memory.address.RawAddressNode;
  31 import org.graalvm.compiler.nodes.util.GraphUtil;
  32 import org.graalvm.compiler.phases.Phase;
  33 
  34 public class AddressLoweringPhase extends Phase {
  35 
  36     public abstract static class AddressLowering {
  37 
  38         public abstract AddressNode lower(ValueNode address);
  39 
  40         public abstract AddressNode lower(ValueNode base, ValueNode offset);
  41     }
  42 
  43     private final AddressLowering lowering;
  44 
  45     public AddressLoweringPhase(AddressLowering lowering) {
  46         this.lowering = lowering;
  47         assert lowering != null;
  48     }
  49 
  50     @Override
  51     protected void run(StructuredGraph graph) {
  52         for (Node node : graph.getNodes()) {
  53             AddressNode lowered;
  54             if (node instanceof RawAddressNode) {
  55                 RawAddressNode address = (RawAddressNode) node;
  56                 lowered = lowering.lower(address.getAddress());
  57             } else if (node instanceof OffsetAddressNode) {
  58                 OffsetAddressNode address = (OffsetAddressNode) node;
  59                 lowered = lowering.lower(address.getBase(), address.getOffset());
  60             } else {
  61                 continue;
  62             }
  63             node.replaceAtUsages(lowered);
  64             GraphUtil.killWithUnusedFloatingInputs(node);
  65         }
  66     }
  67 }