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

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 * The Universal Permissive License (UPL), Version 1.0
 *
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 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
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 * the Larger Works (as defined below), to deal in both
 *
 * (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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package com.oracle.truffle.sl.nodes.access;

import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.api.object.Location;
import com.oracle.truffle.api.object.Property;
import com.oracle.truffle.api.object.Shape;
import com.oracle.truffle.sl.runtime.SLUndefinedNameException;

public abstract class SLReadPropertyCacheNode extends SLPropertyCacheNode {

    public abstract Object executeRead(DynamicObject receiver, Object name);

    /**
     * Polymorphic inline cache for a limited number of distinct property names and shapes.
     */
    @Specialization(limit = "CACHE_LIMIT", //
                    guards = {
                                    "namesEqual(cachedName, name)",
                                    "shapeCheck(shape, receiver)"
                    }, //
                    assumptions = {
                                    "shape.getValidAssumption()"
                    })
    protected static Object readCached(DynamicObject receiver, @SuppressWarnings("unused") Object name,
                    @SuppressWarnings("unused") @Cached("name") Object cachedName,
                    @Cached("lookupShape(receiver)") Shape shape,
                    @Cached("lookupLocation(shape, name)") Location location) {

        return location.get(receiver, shape);
    }

    protected Location lookupLocation(Shape shape, Object name) {
        /* Initialization of cached values always happens in a slow path. */
        CompilerAsserts.neverPartOfCompilation();

        Property property = shape.getProperty(name);
        if (property == null) {
            /* Property does not exist. */
            throw SLUndefinedNameException.undefinedProperty(this, name);
        }

        return property.getLocation();
    }

    /**
     * The generic case is used if the number of shapes accessed overflows the limit of the
     * polymorphic inline cache.
     */
    @TruffleBoundary
    @Specialization(replaces = {"readCached"}, guards = "receiver.getShape().isValid()")
    protected Object readUncached(DynamicObject receiver, Object name) {
        Object result = receiver.get(name);
        if (result == null) {
            /* Property does not exist. */
            throw SLUndefinedNameException.undefinedProperty(this, name);
        }
        return result;
    }

    @Specialization(guards = "!receiver.getShape().isValid()")
    protected Object updateShape(DynamicObject receiver, Object name) {
        CompilerDirectives.transferToInterpreter();
        receiver.updateShape();
        return readUncached(receiver, name);
    }

    public static SLReadPropertyCacheNode create() {
        return SLReadPropertyCacheNodeGen.create();
    }

}