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 * The Universal Permissive License (UPL), Version 1.0
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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.js.nodes.access;

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.nodes.control.RuntimeErrorNode;
import com.oracle.truffle.js.runtime.Errors;
import com.oracle.truffle.js.runtime.JSErrorType;

import java.util.Set;

public class ConstantVariableWriteNode extends JavaScriptNode implements WriteNode {
    @Child protected JavaScriptNode rhs;
    @Child protected JavaScriptNode errorNode;

    protected ConstantVariableWriteNode(JavaScriptNode rhs, boolean doThrow) {
        this.rhs = rhs;
        this.errorNode = doThrow ? RuntimeErrorNode.create(JSErrorType.TypeError, "Assignment to constant variable.") : null;
    }

    public static ConstantVariableWriteNode create(JavaScriptNode rhs, boolean doThrow) {
        return new ConstantVariableWriteNode(rhs, doThrow);
    }

    @Override
    public Object execute(VirtualFrame frame) {
        Object result = rhs.execute(frame);
        return (errorNode == null) ? result : errorNode.execute(frame);
    }

    @Override
    public JavaScriptNode getRhs() {
        return rhs;
    }

    @Override
    public Object executeWrite(VirtualFrame frame, Object value) {
        throw Errors.shouldNotReachHere();
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return create(cloneUninitialized(rhs, materializedTags), errorNode != null);
    }

}