1 /*
   2  * Copyright (c) 2015, 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.hotspot.amd64;
  24 
  25 import org.graalvm.compiler.core.amd64.AMD64MoveFactory;
  26 import org.graalvm.compiler.lir.amd64.AMD64LIRInstruction;
  27 
  28 import jdk.vm.ci.hotspot.HotSpotCompressedNullConstant;
  29 import jdk.vm.ci.hotspot.HotSpotConstant;
  30 import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant;
  31 import jdk.vm.ci.hotspot.HotSpotObjectConstant;
  32 import jdk.vm.ci.meta.AllocatableValue;
  33 import jdk.vm.ci.meta.Constant;
  34 import jdk.vm.ci.meta.JavaConstant;
  35 
  36 public class AMD64HotSpotMoveFactory extends AMD64MoveFactory {
  37 
  38     public AMD64HotSpotMoveFactory(BackupSlotProvider backupSlotProvider) {
  39         super(backupSlotProvider);
  40     }
  41 
  42     @Override
  43     public boolean canInlineConstant(JavaConstant c) {
  44         if (HotSpotCompressedNullConstant.COMPRESSED_NULL.equals(c)) {
  45             return true;
  46         } else if (c instanceof HotSpotObjectConstant) {
  47             return ((HotSpotObjectConstant) c).isCompressed();
  48         } else {
  49             return super.canInlineConstant(c);
  50         }
  51     }
  52 
  53     @Override
  54     public boolean allowConstantToStackMove(Constant value) {
  55         if (value instanceof HotSpotConstant) {
  56             return ((HotSpotConstant) value).isCompressed();
  57         }
  58         return true;
  59     }
  60 
  61     @Override
  62     public AMD64LIRInstruction createLoad(AllocatableValue dst, Constant src) {
  63         if (HotSpotCompressedNullConstant.COMPRESSED_NULL.equals(src)) {
  64             return super.createLoad(dst, JavaConstant.INT_0);
  65         } else if (src instanceof HotSpotObjectConstant) {
  66             return new AMD64HotSpotMove.HotSpotLoadObjectConstantOp(dst, (HotSpotObjectConstant) src);
  67         } else if (src instanceof HotSpotMetaspaceConstant) {
  68             return new AMD64HotSpotMove.HotSpotLoadMetaspaceConstantOp(dst, (HotSpotMetaspaceConstant) src);
  69         } else {
  70             return super.createLoad(dst, src);
  71         }
  72     }
  73 }