<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/223598>223598</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [lldb][meta] Support building and embedding LLDB under Emscripten
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          anutosh491
      </td>
    </tr>
</table>

<pre>
    Meta-issue to track the work required to build and embed LLDB under an Emscripten host.

This is related to, but distinct from #150449. That issue tracks LLDB support for debugging WebAssembly targets. This issue tracks LLDB itself running under Emscripten—for example, embedding `liblldb`, LLDB's command interpreter and
`lldb-dap` inside a browser application such as [WasmBolt](https://github.com/anutosh491/WasmBolt) (try [here](https://anutosh21.github.io/WasmBolt/))

## Current prototype

The browser-hosted prototype can currently:

- build and load `liblldb` under Emscripten;
- inspect Wasm symbols, DWARF source information and disassembly through the
  SB API;
- connect LLDB's existing `ProcessWasm` support to an in-process WAMR runtime;
- set breakpoints, inspect local variables, step and continue;
- drive the same session through LLDB's command interpreter and `lldb-dap`.

These experiments are currently downstream prototypes. The patches below are intended to make the underlying LLDB build and host abstractions cleanly support this use case upstream. See demos below

https://github.com/user-attachments/assets/ff73f87f-0f9e-422a-aaba-5af6daa4bbb1

https://github.com/user-attachments/assets/2e35e88e-142c-4b69-a40c-5a943ead158c





## Upstream patch series

The patches should be reviewed and merged in this order:

- [ ] #223169 — `[lldb] Add HostInfoEmscripten`
- [ ] #223200 — `[lldb] Add PlatformEmscripten`
- [ ] #223206 — `[lldb] Support building lldbHost under Emscripten`
- [ ] #223210 — `[lldb] Add an option to build liblldb statically`

#223162 was the initial bootstrap that selected `PlatformLinux` as the Emscripten host platform. It is superseded by the dedicated
`HostInfoEmscripten` and `PlatformEmscripten` split above and is not intended to remain part of the final series.
</pre>
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