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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.graalvm.compiler.nodes.memory;

import org.graalvm.compiler.core.common.LIRKind;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.graph.Node;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.Canonicalizable;
import org.graalvm.compiler.graph.spi.CanonicalizerTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.NodeView;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.memory.address.AddressNode;
import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
import jdk.internal.vm.compiler.word.LocationIdentity;

Writes a given value a memory location.
/** * Writes a given {@linkplain #value() value} a {@linkplain FixedAccessNode memory location}. */
@NodeInfo(nameTemplate = "Write#{p#location/s}") public class WriteNode extends AbstractWriteNode implements LIRLowerableAccess, Canonicalizable { public static final NodeClass<WriteNode> TYPE = NodeClass.create(WriteNode.class); public WriteNode(AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType) { super(TYPE, address, location, value, barrierType); } protected WriteNode(NodeClass<? extends WriteNode> c, AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType) { super(c, address, location, value, barrierType); } @Override public void generate(NodeLIRBuilderTool gen) { LIRKind writeKind = gen.getLIRGeneratorTool().getLIRKind(value().stamp(NodeView.DEFAULT)); gen.getLIRGeneratorTool().getArithmetic().emitStore(writeKind, gen.operand(address), gen.operand(value()), gen.state(this)); } @Override public Stamp getAccessStamp(NodeView view) { return value().stamp(view); } @Override public boolean canNullCheck() { return true; } @Override public boolean hasSideEffect() { /* * Writes to newly allocated objects don't have a visible side-effect to the interpreter */ if (getLocationIdentity().equals(LocationIdentity.INIT_LOCATION)) { return false; } return super.hasSideEffect(); } @Override public Node canonical(CanonicalizerTool tool) { if (tool.canonicalizeReads() && hasExactlyOneUsage() && next() instanceof WriteNode) { WriteNode write = (WriteNode) next(); if (write.lastLocationAccess == this && write.getAddress() == getAddress() && getAccessStamp(NodeView.DEFAULT).isCompatible(write.getAccessStamp(NodeView.DEFAULT))) { write.setLastLocationAccess(getLastLocationAccess()); return write; } } return this; } @Override public LocationIdentity getKilledLocationIdentity() { return getLocationIdentity(); } }