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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.sl.nodes.access;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.interop.ForeignAccess;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.source.SourceSection;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import com.oracle.truffle.sl.nodes.interop.SLForeignToSLTypeNode;
import com.oracle.truffle.sl.nodes.interop.SLForeignToSLTypeNodeGen;
import com.oracle.truffle.sl.runtime.SLContext;

/**
 * The node for accessing a property of an object. When executed, this node first evaluates the
 * object expression on the left side of the dot operator and then reads the named property.
 */
@NodeInfo(shortName = ".")
@NodeChild(value = "receiver", type = SLExpressionNode.class)
public abstract class SLReadPropertyNode extends SLExpressionNode {

    @Child private SLReadPropertyCacheNode cacheNode;
    private final String propertyName;

    public SLReadPropertyNode(SourceSection src, String propertyName) {
        super(src);
        this.propertyName = propertyName;
        this.cacheNode = SLReadPropertyCacheNode.create(propertyName);
    }

    @Specialization(guards = "isSLObject(object)")
    public Object doSLObject(DynamicObject object) {
        return cacheNode.executeObject(SLContext.castSLObject(object));
    }

    @Child private Node foreignRead;
    @Child private SLForeignToSLTypeNode toSLType;

    @Specialization
    public Object doForeignObject(VirtualFrame frame, TruffleObject object) {
        if (foreignRead == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            this.foreignRead = insert(Message.READ.createNode());
            this.toSLType = insert(SLForeignToSLTypeNodeGen.create(getSourceSection(), null));
        }
        Object result = ForeignAccess.execute(foreignRead, frame, object, new Object[]{propertyName});
        Object slValue = toSLType.executeWithTarget(frame, result);
        return slValue;
    }
}