hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/UnaryArithmeticNode.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.graalvm.compiler.nodes.calc;

import java.io.Serializable;
import java.util.function.Function;

import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
import org.graalvm.compiler.core.common.type.ArithmeticOpTable.UnaryOp;
import org.graalvm.compiler.core.common.type.Stamp;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.graph.spi.CanonicalizerTool;
import org.graalvm.compiler.nodeinfo.NodeInfo;
import org.graalvm.compiler.nodes.ArithmeticOperation;
import org.graalvm.compiler.nodes.ConstantNode;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.nodes.spi.ArithmeticLIRLowerable;

@NodeInfo
public abstract class UnaryArithmeticNode<OP> extends UnaryNode implements ArithmeticOperation, ArithmeticLIRLowerable {

    @SuppressWarnings("rawtypes") public static final NodeClass<UnaryArithmeticNode> TYPE = NodeClass.create(UnaryArithmeticNode.class);

    protected interface SerializableUnaryFunction<T> extends Function<ArithmeticOpTable, UnaryOp<T>>, Serializable {
    }

    protected final SerializableUnaryFunction<OP> getOp;

    protected UnaryArithmeticNode(NodeClass<? extends UnaryArithmeticNode<OP>> c, SerializableUnaryFunction<OP> getOp, ValueNode value) {
        super(c, getOp.apply(ArithmeticOpTable.forStamp(value.stamp())).foldStamp(value.stamp()), value);
        this.getOp = getOp;
    }

    protected final UnaryOp<OP> getOp(ValueNode forValue) {
        return getOp.apply(ArithmeticOpTable.forStamp(forValue.stamp()));
    }

    @Override
    public final UnaryOp<OP> getArithmeticOp() {
        return getOp(getValue());
    }

    @Override
    public Stamp foldStamp(Stamp newStamp) {
        assert newStamp.isCompatible(getValue().stamp());
        return getOp(getValue()).foldStamp(newStamp);
    }

    @Override
    public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
        ValueNode synonym = findSynonym(forValue, getOp(forValue));
        if (synonym != null) {
            return synonym;
        }
        return this;
    }

    protected static <OP> ValueNode findSynonym(ValueNode forValue, UnaryOp<OP> op) {
        if (forValue.isConstant()) {
            return ConstantNode.forPrimitive(op.foldStamp(forValue.stamp()), op.foldConstant(forValue.asConstant()));
        }
        return null;
    }
}