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 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 }