1 /* 2 * Copyright (c) 2019, 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.replacements.nodes; 26 27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_8; 28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_8; 29 30 import org.graalvm.compiler.core.common.type.StampFactory; 31 import org.graalvm.compiler.graph.NodeClass; 32 import org.graalvm.compiler.nodeinfo.InputType; 33 import org.graalvm.compiler.nodeinfo.NodeInfo; 34 import org.graalvm.compiler.nodes.ValueNode; 35 import org.graalvm.compiler.nodes.memory.FixedAccessNode; 36 import org.graalvm.compiler.nodes.memory.address.AddressNode; 37 import org.graalvm.compiler.nodes.memory.address.OffsetAddressNode; 38 import org.graalvm.compiler.nodes.spi.LIRLowerable; 39 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 40 import org.graalvm.compiler.word.Word; 41 import jdk.internal.vm.compiler.word.LocationIdentity; 42 43 /** 44 * Zeros a chunk of memory. 45 */ 46 @NodeInfo(nameTemplate = "ZeroMemory#{p#location/s}", allowedUsageTypes = {InputType.Memory}, cycles = CYCLES_8, size = SIZE_8) 47 public class ZeroMemoryNode extends FixedAccessNode implements LIRLowerable { 48 public static final NodeClass<ZeroMemoryNode> TYPE = NodeClass.create(ZeroMemoryNode.class); 49 50 @Input ValueNode length; 51 52 public ZeroMemoryNode(ValueNode address, ValueNode length, LocationIdentity locationIdentity) { 53 this(OffsetAddressNode.create(address), length, locationIdentity, BarrierType.NONE); 54 } 55 56 public ZeroMemoryNode(AddressNode address, ValueNode length, LocationIdentity locationIdentity, BarrierType type) { 57 super(TYPE, address, locationIdentity, StampFactory.forVoid(), type); 58 this.length = length; 59 } 60 61 @Override 62 public void generate(NodeLIRBuilderTool gen) { 63 gen.getLIRGeneratorTool().getArithmetic().emitZeroMemory(gen.operand(getAddress()), gen.operand(length)); 64 } 65 66 @Override 67 public boolean canNullCheck() { 68 return false; 69 } 70 71 @NodeIntrinsic 72 public static native void zero(Word address, long length, @ConstantNodeParameter LocationIdentity locationIdentity); 73 }