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 * The Universal Permissive License (UPL), Version 1.0
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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
 * one is included with the Software each a "Larger Work" to which the Software
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
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 * This license is subject to the following condition:
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 * portions of the Software.
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package com.oracle.truffle.sl.nodes;

import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.frame.FrameDescriptor;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrument.Probe;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.sl.SLLanguage;
import com.oracle.truffle.sl.builtins.SLBuiltinNode;
import com.oracle.truffle.sl.nodes.controlflow.SLFunctionBodyNode;
import com.oracle.truffle.sl.runtime.SLContext;

/**
 * The root of all SL execution trees. It is a Truffle requirement that the tree root extends the
 * class {@link RootNode}. This class is used for both builtin and user-defined functions. For
 * builtin functions, the {@link #bodyNode} is a subclass of {@link SLBuiltinNode}. For user-defined
 * functions, the {@link #bodyNode} is a {@link SLFunctionBodyNode}.
 */
@NodeInfo(language = "Simple Language", description = "The root of all Simple Language execution trees")
public final class SLRootNode extends RootNode {

    /** The function body that is executed, and specialized during execution. */
    @Child private SLExpressionNode bodyNode;

    /** The name of the function, for printing purposes only. */
    private final String name;

    @CompilationFinal private boolean isCloningAllowed;

    @SuppressWarnings("unused")
    public SLRootNode(SLContext ignore, FrameDescriptor frameDescriptor, SLExpressionNode bodyNode, String name) {
        super(SLLanguage.class, null, frameDescriptor);
        this.bodyNode = bodyNode;
        this.name = name;
    }

    @Override
    public Object execute(VirtualFrame frame) {
        assert SLLanguage.INSTANCE.findContext0(SLLanguage.INSTANCE.createFindContextNode0()) != null;
        return bodyNode.executeGeneric(frame);
    }

    public String getName() {
        return name;
    }

    public void setCloningAllowed(boolean isCloningAllowed) {
        this.isCloningAllowed = isCloningAllowed;
    }

    public SLExpressionNode getBodyNode() {
        return bodyNode;
    }

    @Override
    public boolean isCloningAllowed() {
        return isCloningAllowed;
    }

    @Override
    public void applyInstrumentation() {
        Probe.applyASTProbers(bodyNode);
    }

    @Override
    public String toString() {
        return "root " + name;
    }
}