<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/140170>140170</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clangd language server crashing when using C++ #embed macro.
        </td>
    </tr>

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

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

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

<pre>
    I'm using the `#embed` macro in clangd to include some shader source into a header file. I have a setup like so:

shader/source.h:
```cpp
#pragma once

namespace frontend::shader {
const char source[] = {
// type declarations
#embed "type/camera.wgsl"
    , '\n',

// globals
#embed "bindings.wgsl"
 , '\n',

// logic

// entry points
#embed "visual.wgsl"
    , '\n', 0,
};
} // namespace frontend::shader
```

init_shader.cpp:
```cpp
#include "shader/source.h"
#include "frontend/engine.h"
#include "frontend/util/str.h"
#include "webgpu/webgpu.h"
#include <vector>

namespace frontend {
void engine::init_shader() {
    auto shader_src_desc = WGPUShaderSourceWGSL{
        .chain =
 WGPUChainedStruct{
                .next = nullptr,
                .sType = WGPUSType_ShaderSourceWGSL,
            },
        .code = util::string_view(shader::source),
    };
    auto shader_mod_desc = WGPUShaderModuleDescriptor{
        .nextInChain = &shader_src_desc.chain,
 .label = util::string_view("shader module"),
    };
}
} // namespace frontend
```

But Clangd repeatedly crashes with the error:

```
/usr/bin/clang++ --driver-mode=g++ -fdiagnostics-color=always -g -Iinclude -Iexternal/glfw/include -Iexternal/imgui -Iexternal/wgpu-native/dist/include -c -fPIC -MMD -x c++-header -resource-dir=/home/user/.config/VSCodium/User/globalStorage/llvm-vs-code-extensions.vscode-clangd/install/19.1.2/clangd_19.1.2/lib/clang/19 -- /home/user/Project5/src/shader/source.h
I[21:05:50.999] --> windowDoneProgress/create(0)
I[21:05:50.999] Enqueueing 11 commands for indexing
I[21:05:50.999] <-- reply(0)
I[21:05:50.999] --> $/progress
I[21:05:50.999] --> $/progress
I[21:05:51.000] --> textDocument/clangd.fileStatus
I[21:05:51.000] --> textDocument/clangd.fileStatus
I[21:05:51.002] <-- textDocument/documentLink(3)
I[21:05:51.003] <-- textDocument/inlayHint(4)
I[21:05:51.004] Built preamble of size 239148 for file /home/user/Project5/src/shader/source.h version 15 in 0.00 seconds
I[21:05:51.004] Indexing c++17 standard library in the context of /home/user/Project5/src/shader/source.h
I[21:05:51.005] --> workspace/semanticTokens/refresh(1)
I[21:05:51.005] --> textDocument/clangd.fileStatus
I[21:05:51.005] <-- reply(1)
I[21:05:51.008] --> textDocument/publishDiagnostics
I[21:05:51.009] --> textDocument/inactiveRegions
I[21:05:51.009] --> textDocument/clangd.fileStatus
I[21:05:51.011] <-- textDocument/semanticTokens/full(5)
I[21:05:51.087] --> $/progress
I[21:05:51.087] --> $/progress
I[21:05:51.087] --> $/progress
I[21:05:51.200] <-- textDocument/foldingRange(6)
I[21:05:51.200] --> reply:textDocument/foldingRange(6) 0 ms
I[21:05:51.299] <-- textDocument/documentSymbol(7)
I[21:05:51.324] Built preamble of size 6906136 for file /home/user/Project5/src/init_shader.cpp version 1 in 0.32 seconds
I[21:05:51.324] --> workspace/semanticTokens/refresh(2)
I[21:05:51.324] <-- reply(2)
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      /home/user/Project5/src/init_shader.cpp:15:43: current parser token 'source'
1.      /home/user/Project5/src/init_shader.cpp:7:1: parsing namespace 'frontend'
2.      /home/user/Project5/src/init_shader.cpp:8:28: parsing function body 'frontend::engine::init_shader'
3.      /home/user/Project5/src/init_shader.cpp:8:28: in compound statement ('{}')
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  clangd    0x000000000055715b
1 clangd    0x0000000000554fbe
2  clangd    0x0000000000557af6
3  libc.so.6 0x00007f9cb9932050
4  libc.so.6 0x00007f9ca0038fa0
Signalled during AST worker action: Build AST
  Filename: frontend/src/init_shader.cpp
 Directory: /home/user/Project5
  Command Line: /usr/bin/clang++ --driver-mode=g++ -fdiagnostics-color=always -g -Iinclude -Iexternal/glfw/include -Iexternal/imgui -Iexternal/wgpu-native/dist/include -o build/init/shader.o -c -fPIC -MMD -resource-dir=/home/user/.config/VSCodium/User/globalStorage/llvm-vs-code-extensions.vscode-clangd/install/19.1.2/clangd_19.1.2/lib/clang/19 -- /home/user/Project5/src/init_shader.cpp
  Version: 1
[Error - 9:05:52 PM] The Clang Language Server server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.
[Error - 9:05:52 PM] Request textDocument/documentSymbol failed.
[object Object]
[Error - 9:05:52 PM] Request textDocument/codeAction failed.
[object Object]
[Error - 9:05:52 PM] Request textDocument/documentLink failed.
[object Object]
[Error - 9:05:52 PM] Request textDocument/inlayHint failed.
[object Object]
[Error - 9:05:52 PM] Request textDocument/semanticTokens/full failed.
[object Object]
[Error - 9:05:52 PM] Request textDocument/documentSymbol failed.
[object Object]
```

I believe this is due to using `#embed`, because removing them stops the crashing. Strangely, I am allowed to use one or two `#embed` macros, but using three causes a crash.
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzcWVtv47ju_zTqC2HDluNcHvKQJs1ugQ62mMzu4v9_KWSLcXQqS1lJTtr99Ae03aSXpN2ZOX04pwgaR6JIipefSFl4ryqDOGX5JcsXF6IJG-umM3Ov_tZ4UVj5OL1mfFRD45WpIGwQ2DBhPMO6QMmGCdSidBaUgVILU0kI9KPUjUTwtkbwGyHRgbeNKxGUCRYEbLAdXCuNMVzDRuwQBHgMzRa0uqelLJuxhD4dA8aXHYt4088Mk-5Tbrf0k2dbJ6pagDUldiuNqNFvRYmwdtYENJKWZj1HYKNLlsxKa3yAciOedOxMASxb9BSMLxlfQnjcIkgstXAiKGt8J7U1BDDOaZ7xZSlqdCLeV14zzlkyAwBgfA6Mj1g-N_TF552CPedK20Lo1_wKZaQylX_O6n0-2laqfDGCJrhH2Fplwmv2O-UboT_SE5JeyGjBssvuAXrm75v3uYs6nZRR4a6bjMlpZ9z4FD2M87eubzV9SXQQzpdoKmU-JmuC0sQ0uNOkeyyqbcP4sns4RZTNd1gG61h2dS7W-ujZWSWhU6wzzzMzMD5mfNITkv1FE2yfMXfelXcSfdlG4p-_3P6-asdXrSn-_GV1c1xGf3G5EcoQMQ0S_ZwGUK6Ca8rwkviwyOBDaAWYRuttcJ2335D5bxT8B0Xo190bdd4spaB5MRiXVnZsWhd00RKcMtXdTuGe8XFvl26mS0c-OTI5hOFrY9VWnjLWFysbjQv0pVNbctdLk9Hur838yXDA-PCV8Tur9grEWhSo39X_ELRQt6Ipck5ugB4-yqY3GXTZBJh3MOtwiyKg1I9QOuE36GGvwqZFaHTOugN-vuDBl42nhCpoU8sWshm_ZPwSokg6tUMX1VYiyxaH8bVUojLWB1X6qLSaWC-E3otHD1EF0fVTUkTX-BDQGUHJVen1nvHlyTlVV416ObSvtk1kRFA7wlCpfHi-uIRofXs9h-jLlwVED1B2ukX9MRI57GIlkoqUY3y5sTW2m23hIy6tWauK8eUfq7mVqqkZX_7ezXXguwrWiYqWaL2rox3tVGJEGhpPYB_vfDvSnXKtcj4ITbqnkziN-ZM55d3ht1bF0cjLdAJRBG90u3X2X1iGnADJlfT_Degls2uWX_KUZbMkZ9ksT-LJZEKHVBSx7Ar2yki7X1iDt85WDr0nsY7ig_FxQgF4nsWV-avBBul0T1MobV0LIz2srQNlJD4oU72zmmXzKKJg1I8fi-q0ZXzA-HL7pOnPkqdxkiRH8oAPYWHLpkYTDi6JqdBYBRGaz2LAj8Z4xUD2jzfK3DM-zk6aiFhkZ1koo8Xjr4qex4Oz6we0_rJROsDWoagLjWDX4NXfCDybpINx61TayY9EIezQUSZAmlO1l8RJAh5La-QZk7T6XPch9JSy6Qh8EEYKJ0Grwgn3SNwItUpCvYdAOv9HkoR0yJ8liXX3Lb7SIqyFCar8Zu_RULI4XDv0G8bH6Vn75j8bI_nbhDkvbXxW2rYptPKbxRGVT3OYnOWgjCgJab9i1dex37X8n203Tc_G8xvzrxsC0nF-zhrj0XfhwaeS8w4sTm5sbTWV7F-FoaNkPDyzH_4cb7pQyGYfs4IE6tMqPcfiM_CzeqwLS0YenVEq4-8ByHCSDNNs-D0I8qrcP-JHBx8Zfw8-em2-K3X5-zt7mXk98e3N1Wx1Bb4pahVAQNFURGJdoEZ2E8LWUyHVlmiVCpumiEtb92XCU7Ww7bZOe_a-QdIKhJGHPrhFNyrSoBDlfXCixJgls1UQ5T3Ipu5boSRmyeS77cqyWUobHWQsm0HZOIcmwFY4jw4CWYk6uqdaesSSWfqjckYki6QQdwL1Y83K-OjYYJEQ_qNCxiyb8fFzKevGlNRwQ2Hl4wtJbQF-trciNbKfV0MZqoq2tjGSzq6AlE7Q1voj6ieoyemT6ujRthi3TQDf5l1nKVqExjcO4dE23a1HG0AdkfobqeaiOQe3s2-_gnXgMXQ1vdkpZ00reyccsGFyc_PHl7vV_325_O3m-v-vvt7REjZMKHDbjr-9igmkWRde8HRFAwDJQ3L4y_NRmhcUGGcJBusCyanvsBDrIdkb6FgvY2_jYU8xWk_KYjLJeJJTCzI4TSGSJBuvBVGsVGWE1ihBNtRbwWz1rcUAdCDaSCC3EFBJmmo7q6XSSDammWed_mnvJjNYKNf274S872AZsZ53JTHcdFEG_6U9lIWCLNab41BCxfZ1e_U_1UydcD380R1E5MuUeuL88ooaZohgcjg1ONx-oUPj2wa7jhtuhKkaUSGs0O2QErP96ppvCTkERSneF7Na-AAZ1Mo0AX3c8ulX7JXWYGyAAsGhD8IFlDGssDsobBO2TWgP2to6BGXW1tXtjWP8kbZf8a8GfXi_BoC1UBplz8wWZDD4rf1i-eIHRZA7Zx1Kfwb7503Upwg4tFifwv1kwfuphvqnrn55v3QNBWqFO4pE5UF5kA3SMdLd_r-8-Wd8DgWWovEUx7Xd9S8IavDBbv2x6lGmimEVHJWyVHvN4RpEDUJru0fZsUewBum8C3t78g2Db8U14fAiwiFCK9yD6OTEF3KayUk2ERc4TUeDUZaPOR9ebKZS4qBMMpmORVIUw6wokmy4LhIuJjKTI7xQU57wPMnTYZKmo2QYF7Q-H8hSrrPxepiwQYK1UDomRIutqy7aUm-aDpJ0lFy0F4O-fYvCucE9tLOMc5YvLty0hcGiqTwbJFr54I9sggoap_2lnn7CmOfgQtvdb9D0O5_3Z8rhLr81T3zROD398Xq138duyv8dAAD__1US7hE">