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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
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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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
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package com.oracle.truffle.js.nodes.access;

import com.oracle.truffle.api.frame.Frame;
import com.oracle.truffle.api.frame.FrameSlot;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.api.nodes.NodeUtil;
import com.oracle.truffle.api.nodes.UnexpectedResultException;
import com.oracle.truffle.api.profiles.BranchProfile;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.runtime.JSFrameUtil;

import java.util.Set;

public final class TemporalDeadZoneCheckNode extends FrameSlotNode {
    @Child private JavaScriptNode child;
    @Child private ScopeFrameNode levelFrameNode;
    private final BranchProfile deadBranch = BranchProfile.create();

    private TemporalDeadZoneCheckNode(FrameSlot frameSlot, ScopeFrameNode levelFrameNode, JavaScriptNode child) {
        super(frameSlot);
        this.levelFrameNode = levelFrameNode;
        this.child = child;
        assert JSFrameUtil.hasTemporalDeadZone(frameSlot);
    }

    private void checkNotDead(VirtualFrame frame) {
        Frame levelFrame = levelFrameNode.executeFrame(frame);
        if (levelFrame.isObject(frameSlot)) {
            checkNotDead(super.getObject(levelFrame), deadBranch);
        }
    }

    @Override
    public Object execute(VirtualFrame frame) {
        checkNotDead(frame);
        return child.execute(frame);
    }

    @Override
    public int executeInt(VirtualFrame frame) throws UnexpectedResultException {
        checkNotDead(frame);
        return child.executeInt(frame);
    }

    @Override
    public double executeDouble(VirtualFrame frame) throws UnexpectedResultException {
        checkNotDead(frame);
        return child.executeDouble(frame);
    }

    @Override
    public boolean executeBoolean(VirtualFrame frame) throws UnexpectedResultException {
        checkNotDead(frame);
        return child.executeBoolean(frame);
    }

    @Override
    public ScopeFrameNode getLevelFrameNode() {
        return levelFrameNode;
    }

    @Override
    public boolean hasTemporalDeadZone() {
        return true;
    }

    public static TemporalDeadZoneCheckNode create(FrameSlot frameSlot, ScopeFrameNode levelFrameNode, JavaScriptNode rhs) {
        return new TemporalDeadZoneCheckNode(frameSlot, levelFrameNode, rhs);
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return new TemporalDeadZoneCheckNode(frameSlot, NodeUtil.cloneNode(levelFrameNode), cloneUninitialized(child, materializedTags));
    }
}