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What is the code that generates the ExtensionInterface suffixed classes ?

For example, there is this file that declares extension attribute on the product options (and others). Magento/Catalog/etc/extension_attributes.xml.

Here is a sample if it.

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
    <extension_attributes for="Magento\Quote\Api\Data\ProductOptionInterface">
        <attribute code="custom_options" type="Magento\Catalog\Api\Data\CustomOptionInterface[]" />
    </extension_attributes>
    ....
</config>

This declaration will add the methods getCustomOptions and getCustomOptions in the autogenrated interface Magento\Catalog\Api\Data\ProductOptionExtensionInterface and in the implementation of this class Magento\Catalog\Api\Data\ProductOptionExtension (both located in the generated/code folder).

My question is simple. What is the code that reads the extension_attributes.xml files and generates the interfaces and classes?

(PS. I don't want an explanation on how to add my own attributes).

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