1 /*
   2  * Copyright (c) 2016, 2016, 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.lir.util;
  24 
  25 import java.util.function.BiConsumer;
  26 
  27 import jdk.vm.ci.code.Architecture;
  28 import jdk.vm.ci.code.Register;
  29 import jdk.vm.ci.code.RegisterArray;
  30 
  31 public class RegisterMap<T> {
  32     private final Object[] values;
  33     private final Architecture architecture;
  34 
  35     public RegisterMap(Architecture arch) {
  36         assert checkArchitecture(arch);
  37         this.values = new Object[arch.getRegisters().size()];
  38         this.architecture = arch;
  39     }
  40 
  41     @SuppressWarnings("unchecked")
  42     public T get(Register reg) {
  43         return (T) values[index(reg)];
  44     }
  45 
  46     public void remove(Register reg) {
  47         values[index(reg)] = null;
  48     }
  49 
  50     public void put(Register reg, T value) {
  51         values[index(reg)] = value;
  52     }
  53 
  54     @SuppressWarnings("unchecked")
  55     public void forEach(BiConsumer<? super Register, ? super T> consumer) {
  56         for (int i = 0; i < values.length; ++i) {
  57             T value = (T) values[i];
  58             if (value != null) {
  59                 consumer.accept(architecture.getRegisters().get(i), value);
  60             }
  61         }
  62     }
  63 
  64     private static int index(Register reg) {
  65         return reg.number;
  66     }
  67 
  68     private static boolean checkArchitecture(Architecture arch) {
  69         RegisterArray registers = arch.getRegisters();
  70         for (int i = 0; i < registers.size(); ++i) {
  71             assert registers.get(i).number == i : registers.get(i) + ": " + registers.get(i).number + "!=" + i;
  72         }
  73         return true;
  74     }
  75 }