<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/55542>55542</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            HLSL ExternalSema/AST source
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            HLSL
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          llvm-beanz
      </td>
    </tr>
</table>

<pre>
    Some HLSL data types and methods are not expressible in the source language, but are expressible in clang ASTs. In DXC this was implemented using an ExternalSema/AST source, which also allows for lazily fleshing out the AST entries. We'll need a similar ExternalAST/Sema source in clang.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJx1kk2PnDAMhn8NXKwiCGQoBw7b3a620t6mUnsNxEAqk4zi0NnZX1-DOq1UqVIUJ7L9vk8-hmBv_TmsCC-v51ewJhlItwsyGG9hxbQEK-uI4EMCfLtEZHYDITgPaUHgsMURgYyfNzNjph5h2NLR8U_1uNfAw_krF_DFw9P3RxFwDFfD4NYL4Yo-oYWNndQZD5_fEkZv6IyrydSzdP52202uixsXMMRBJgpXhilEwXh3dIOJkJddJQjKTrn3inp0KObfRKAlAo_iZoDd6sjEP3ZSK2676f1wd_git31tu7ozeXKJsD_u7L-Y-RapX1K6cFY_SEbG7NKyDcUYVtkQ_byHD5cYfuCYZOuYN2RZaK0blS992Y7t6aSatu60xm6s7HQa6rbUdmj2kJMZkLjP9KdMqR1JQqafcterUqlSV231USvdFVWnK1t11VQN7VRWTdaUwuyo2BGKEOc89gfNsM0sSXKc-G_SyFvOcmmHk-ibTX7HvQONf88P9v4A_wUYksi2">