com.oracle.truffle.sl.nodes.access.SLReadPropertyNode Maven / Gradle / Ivy

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 * (a) the Software, and
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package com.oracle.truffle.sl.nodes.access;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.ImportStatic;
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.interop.ForeignAccess;
import com.oracle.truffle.api.interop.Message;
import com.oracle.truffle.api.interop.TruffleObject;
import com.oracle.truffle.api.interop.UnknownIdentifierException;
import com.oracle.truffle.api.interop.UnsupportedMessageException;
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.sl.nodes.SLExpressionNode;
import com.oracle.truffle.sl.nodes.interop.SLForeignToSLTypeNode;
import com.oracle.truffle.sl.runtime.SLContext;
import com.oracle.truffle.sl.runtime.SLUndefinedNameException;

/**
 * The node for reading a property of an object. When executed, this node:
 * 
 * evaluates the object expression on the left hand side of the object access operator
 * evaluated the property name
 * reads the named property
 * 
 */
@NodeInfo(shortName = ".")
@NodeChildren({@NodeChild("receiverNode"), @NodeChild("nameNode")})
@ImportStatic({SLContext.class, Message.class})
public abstract class SLReadPropertyNode extends SLExpressionNode {

    @Specialization(guards = "isSLObject(receiver)")
    protected Object read(DynamicObject receiver, Object name,
                    @Cached("create()") SLReadPropertyCacheNode readNode) {
        /**
         * The polymorphic cache node that performs the actual read. This is a separate node so that
         * it can be re-used in cases where the receiver and name are not nodes but already
         * evaluated values.
         */
        return readNode.executeRead(receiver, name);
    }

    /**
     * Language interoperability: if the receiver object is a foreign value we use Truffle's interop
     * API to access the foreign data.
     */
    @Specialization(guards = "!isSLObject(receiver)")
    protected Object readForeign(TruffleObject receiver, Object name,
                    // The child node to access the foreign object
                    @Cached("READ.createNode()") Node foreignReadNode,
                    // The child node to convert the result of the foreign read to a SL value
                    @Cached("create()") SLForeignToSLTypeNode toSLTypeNode) {

        try {
            /* Perform the foreign object access. */
            Object result = ForeignAccess.sendRead(foreignReadNode, receiver, name);
            /* Convert the result to a SL value. */
            return toSLTypeNode.executeConvert(result);

        } catch (UnknownIdentifierException | UnsupportedMessageException e) {
            /* Foreign access was not successful. */
            throw SLUndefinedNameException.undefinedProperty(this, name);
        }
    }

    /**
     * When no specialization fits, the receiver is either not an object (which is a type error), or
     * the object has a shape that has been invalidated.
     */
    @Fallback
    protected Object typeError(@SuppressWarnings("unused") Object r, Object name) {
        /* Non-object types do not have properties. */
        throw SLUndefinedNameException.undefinedProperty(this, name);
    }

}