SLInvokeNode.java

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

import com.oracle.truffle.api.CompilerAsserts;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.StandardTags;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import com.oracle.truffle.sl.runtime.SLFunction;

/**
 * The node for function invocation in SL. Since SL has first class functions, the {@link SLFunction
 * target function} can be computed by an arbitrary expression. This node is responsible for
 * evaluating this expression, as well as evaluating the {@link #argumentNodes arguments}. The
 * actual dispatch is then delegated to a chain of {@link SLDispatchNode} that form a polymorphic
 * inline cache.
 */
@NodeInfo(shortName = "invoke")
public final class SLInvokeNode extends SLExpressionNode {

    @Child private SLExpressionNode functionNode;
    @Children private final SLExpressionNode[] argumentNodes;
    @Child private SLDispatchNode dispatchNode;

    public SLInvokeNode(SLExpressionNode functionNode, SLExpressionNode[] argumentNodes) {
        this.functionNode = functionNode;
        this.argumentNodes = argumentNodes;
        this.dispatchNode = SLDispatchNodeGen.create();
    }

    @ExplodeLoop
    @Override
    public Object executeGeneric(VirtualFrame frame) {
        Object function = functionNode.executeGeneric(frame);

        /*
         * The number of arguments is constant for one invoke node. During compilation, the loop is
         * unrolled and the execute methods of all arguments are inlined. This is triggered by the
         * ExplodeLoop annotation on the method. The compiler assertion below illustrates that the
         * array length is really constant.
         */
        CompilerAsserts.compilationConstant(argumentNodes.length);

        Object[] argumentValues = new Object[argumentNodes.length];
        for (int i = 0; i < argumentNodes.length; i++) {
            argumentValues[i] = argumentNodes[i].executeGeneric(frame);
        }
        return dispatchNode.executeDispatch(function, argumentValues);
    }

    @Override
    protected boolean isTaggedWith(Class<?> tag) {
        if (tag == StandardTags.CallTag.class) {
            return true;
        }
        return super.isTaggedWith(tag);
    }
}