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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
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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.js.nodes.control;

import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.runtime.objects.Undefined;

import java.util.Set;

public class LabelNode extends StatementNode {

    @Child private JavaScriptNode block;
    private final BreakTarget target;

    LabelNode(JavaScriptNode block, BreakTarget target) {
        this.block = block;
        this.target = target;
    }

    public static LabelNode create(JavaScriptNode block, BreakTarget target) {
        return new LabelNode(block, target);
    }

    @Override
    public Object execute(VirtualFrame frame) {
        try {
            return block.execute(frame);
        } catch (LabelBreakException ex) {
            if (!ex.matchTarget(target)) {
                throw ex;
            }
        }
        return EMPTY;
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return create(cloneUninitialized(block, materializedTags), target);
    }

    @Override
    public boolean isResultAlwaysOfType(Class<?> clazz) {
        assert EMPTY == Undefined.instance;
        return clazz == Undefined.class;
    }
}