SLWritePropertyNode.java

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package com.oracle.truffle.sl.nodes.access;

import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.NodeChildren;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.sl.nodes.SLExpressionNode;

/**
 * The node for writing a property of an object. When executed, this node:
 * <ol>
 * <li>evaluates the object expression on the left hand side of the object access operator</li>
 * <li>evaluates the property name</li>
 * <li>evaluates the value expression on the right hand side of the assignment operator</li>
 * <li>writes the named property</li>
 * <li>returns the written value</li>
 * </ol>
 */
@NodeInfo(shortName = ".=")
@NodeChildren({@NodeChild("receiverNode"), @NodeChild("nameNode"), @NodeChild("valueNode")})
public abstract class SLWritePropertyNode extends SLExpressionNode {

    /**
     * The polymorphic cache node that performs the actual write. This is a separate node so that it
     * can be re-used in cases where the receiver, name, and value are not nodes but already
     * evaluated values.
     */
    @Child private SLWritePropertyCacheNode writeNode = SLWritePropertyCacheNodeGen.create();

    @Specialization
    protected Object write(Object receiver, Object name, Object value) {
        writeNode.executeWrite(receiver, name, value);
        return value;
    }
}