<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/119011>119011</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [HLSL] Parse and generate AST for Root Signatures
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          inbelic
      </td>
    </tr>
</table>

<pre>
    This issue handles the parsing of a root signature and generating the AST info from it.

Root signatures are defined as a list of "root elements" and so the in-memory representation will retain this form.

AC:
- [ ] Define `HLSLRootSignatureAttr` in `Attr.td`
- [ ] Use `AdditionalMembers` to hold a list of `HLSLRootElement`s
- [ ] Define `HLSLRootElement` in `HLSLResource.h`
- [ ] Define `ParseHLSLRootSignature` in `Parse/Parser.h`
- [ ] Implement parsing of a root signature (`ParseHLSLRootSignature`) to `Parse/ParseHLSL.cpp`
- [ ] Add usage of `ParseHLSLRootSignature` during function definition parsing to `Parse/Parser.cpp`
- [ ] Add tests of generated AST with `ast-dump` in `AST/HLSL/RootSignatures-AST.hlsl`
</pre>
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