<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/155438>155438</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [llvm-profgen] Support vtable type profiles for context-sensitive LBR perf data or pseudo-probe based profile generation
        </td>
    </tr>

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

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

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

<pre>
    Currently, llvm-profgen supports 4 settings of SamplePGO profile generation -- {LBR without callgraph, LBR with call graph} x {binary using line + discriminator, binary enabling pseudo-probe based mapping}, in [ProfileGenerator::generateProfile](https://github.com/llvm/llvm-project/blob/665da0a1649814471739c41a702e0e9447316b20/llvm/tools/llvm-profgen/ProfileGenerator.cpp#L497C6-L497C40) and [CSProfileGenerator::generateProfile](https://github.com/llvm/llvm-project/blob/665da0a1649814471739c41a702e0e9447316b20/llvm/tools/llvm-profgen/ProfileGenerator.cpp#L878) respectively. 

https://discourse.llvm.org/t/rfc-vtable-type-profiling-for-samplefdo/87283 is an RFC to extend SamplePGO profile format to store the vtable targets of indirect calls and update llvm-profgen to produce the profile. https://github.com/llvm/llvm-project/pull/148013 implements the llvm-profgen change for one setting (LBR without call graph && binary using line + discriminator) and reports unimplemented error for the other three settings.

This is a feature request to support vtable type profiles for context-sensitive LBR profiles (LBR with call graphs) or pseudo-probe based profile generation. 



</pre>
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