1 /*
   2  * Copyright (c) 2015, 2018, 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 
  24 
  25 package org.graalvm.compiler.hotspot.aarch64;
  26 
  27 import static jdk.vm.ci.hotspot.HotSpotCompressedNullConstant.COMPRESSED_NULL;
  28 import static jdk.vm.ci.meta.JavaConstant.INT_0;
  29 import static jdk.vm.ci.meta.JavaConstant.LONG_0;
  30 
  31 import org.graalvm.compiler.core.aarch64.AArch64MoveFactory;
  32 import org.graalvm.compiler.lir.aarch64.AArch64LIRInstruction;
  33 
  34 import jdk.vm.ci.hotspot.HotSpotCompressedNullConstant;
  35 import jdk.vm.ci.hotspot.HotSpotConstant;
  36 import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant;
  37 import jdk.vm.ci.hotspot.HotSpotObjectConstant;
  38 import jdk.vm.ci.meta.AllocatableValue;
  39 import jdk.vm.ci.meta.Constant;
  40 
  41 public class AArch64HotSpotMoveFactory extends AArch64MoveFactory {
  42 
  43     @Override
  44     public boolean canInlineConstant(Constant c) {
  45         if (HotSpotCompressedNullConstant.COMPRESSED_NULL.equals(c)) {
  46             return true;
  47         } else if (c instanceof HotSpotObjectConstant || c instanceof HotSpotMetaspaceConstant) {
  48             return false;
  49         } else {
  50             return super.canInlineConstant(c);
  51         }
  52     }
  53 
  54     @Override
  55     public AArch64LIRInstruction createLoad(AllocatableValue dst, Constant src) {
  56         Constant usedSource;
  57         if (COMPRESSED_NULL.equals(src)) {
  58             usedSource = INT_0;
  59         } else if (src instanceof HotSpotObjectConstant && ((HotSpotObjectConstant) src).isNull()) {
  60             usedSource = LONG_0;
  61         } else {
  62             usedSource = src;
  63         }
  64         if (usedSource instanceof HotSpotConstant) {
  65             HotSpotConstant constant = (HotSpotConstant) usedSource;
  66             if (constant.isCompressed()) {
  67                 return new AArch64HotSpotMove.LoadHotSpotObjectConstantInline(constant, dst);
  68             } else {
  69                 // XXX Do we need the constant table?
  70                 // return new SPARCHotSpotMove.LoadHotSpotObjectConstantFromTable(constant, dst,
  71                 // constantTableBaseProvider.getConstantTableBase());
  72                 return new AArch64HotSpotMove.LoadHotSpotObjectConstantInline(constant, dst);
  73             }
  74         } else {
  75             return super.createLoad(dst, usedSource);
  76         }
  77     }
  78 }