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 }