<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/122119>122119</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] Assertion `(isUnevaluated() || getCharByteWidth() == 1) && "This function is used in places that assume strings use char"' failed
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          wxie7
      </td>
    </tr>
</table>

<pre>
    code
```c
volatile float x = __builtin_nan("st    %1,%0"
 "Alpha Component"
                                 "%Lb"
 "aEgiH"
 u"foo");
```
just crash on assertions trunk
https://godbolt.org/z/4qsrvdqqh
generated via fuzzing
No related issues were found by searching [issue](https://github.com/llvm/llvm-project/issues?q=sort%3Aupdated-desc%20is%3Aissue%20is%3Aopen%20assertion%20This%20function%20is%20used%20in%20places%20that%20assume%20strings%20use%20char)
<details><summary><strong>Backtrace</strong></summary>
<p>

```
clang: /root/llvm-project/clang/include/clang/AST/Expr.h:1856: llvm::StringRef clang::StringLiteral::getString() const: Assertion `(isUnevaluated() || getCharByteWidth() == 1) && "This function is used in places that assume strings use char"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -x c -std=c2x -c <source>
1.      <source>:5:41: current parser token ';'
 #0 0x0000000003c8d758 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3c8d758)
 #1 0x0000000003c8b464 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3c8b464)
 #2 0x0000000003bd89a8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x0000799ace842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x0000799ace8969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x0000799ace842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x0000799ace8287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x0000799ace82871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x0000799ace839e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000077a2ece (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x77a2ece)
#10 0x000000000780cb1c (anonymous namespace)::FloatExprEvaluator::VisitCallExpr(clang::CallExpr const*) ExprConstant.cpp:0:0
#11 0x0000000007805313 clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::FloatExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#12 0x00000000078073a1 EvaluateFloat(clang::Expr const*, llvm::APFloat&, (anonymous namespace)::EvalInfo&) ExprConstant.cpp:0:0
#13 0x00000000077ca3db Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
#14 0x00000000077d2ddb EvaluateAsRValue((anonymous namespace)::EvalInfo&, clang::Expr const*, clang::APValue&) ExprConstant.cpp:0:0
#15 0x00000000077d5fa7 clang::Expr::EvaluateAsRValue(clang::Expr::EvalResult&, clang::ASTContext const&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x77d5fa7)
#16 0x0000000006895647 clang::Sema::CheckImplicitConversion(clang::Expr*, clang::QualType, clang::SourceLocation, bool*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6895647)
#17 0x0000000006897325 AnalyzeImplicitConversions(clang::Sema&, clang::Expr*, clang::SourceLocation, bool) (.constprop.0) SemaChecking.cpp:0:0
#18 0x0000000006898fcd clang::Sema::CheckCompletedExpr(clang::Expr*, clang::SourceLocation, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6898fcd)
#19 0x0000000006c3af1c clang::Sema::ActOnFinishFullExpr(clang::Expr*, clang::SourceLocation, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6c3af1c)
#20 0x00000000069cee65 clang::Sema::AddInitializerToDecl(clang::Decl*, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x69cee65)
#21 0x00000000066645ea clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x66645ea)
#22 0x0000000006673699 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x6673699)
#23 0x000000000663322e clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x663322e)
#24 0x00000000066339e9 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x66339e9)
#25 0x000000000663b193 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x663b193)
#26 0x000000000663c06d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x663c06d)
#27 0x000000000663c510 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x663c510)
#28 0x000000000662e493 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x662e493)
#29 0x000000000461f2b8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x461f2b8)
#30 0x00000000048dbab9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x48dbab9)
#31 0x000000000485e18e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x485e18e)
#32 0x00000000049c906e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49c906e)
#33 0x0000000000ceda5f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xceda5f)
#34 0x0000000000ce54fa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#35 0x0000000004664e49 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#36 0x0000000003bd8e54 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3bd8e54)
#37 0x000000000466543f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#38 0x000000000462902d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x462902d)
#39 0x000000000462a0ae clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x462a0ae)
#40 0x0000000004631bd5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4631bd5)
#41 0x0000000000cea8a3 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xcea8a3)
#42 0x0000000000bb6b84 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xbb6b84)
#43 0x0000799ace829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#44 0x0000799ace829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#45 0x0000000000ce4fa5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xce4fa5)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

```

</p>
</details>
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkWt1y2ziyfhr4BiUXCf5f-IKRrZlM5ZzkxD6zlyoQbEkYQwADgI6cp98CSIkiJdvjWWVqtzY1Uxbx0_31141GEyA1hq8lwA1KPqDk9oq2dqP0zfcdh-yqUvXzDVM1oKBEadD9x1BQPilBLReAV0JRi3cYRbd4uaxaLiyXS0klIjkixFiMMUYkCRGZI5IEiBAUlBgRUopmQ_FcbRslQdq-461_bhhJPlWDHHq35r_2jy0iZKWUH1Sg6MMxbBSUf7TGYqap2WAlMTUGtOVKGmx1Kx9RUG6sbQyKSkQWiCzWqq6UsNdKrxFZ_EBkEX8z-qn-9m2DgnINEjS1UOMnTvGq_fGDyzUKyv9VWIPwHdyYFgz-DhrwSrWyxtUzNkA123C5xij54Eeg5BaRfKKb201bXTO1RWQhxNP-z6zR6g9gFpFFJx1Fi28oujVKW0SSqGyb2ume1WAYIgkJuPHtnaajBtWA9M8HHvzTw8b3k2DVSnZo7dtaA3X33DU3gjLouuyG2r24dttpMlZzuT5M9X_ZhmrnnKBE0bwGS7kwKLpD0dy02y3Vz_2D1UquUXT3gbJHqykDFM0RWRza-8dhjhfY9L_GfmeCujkuXBZaKXvKZTeCLLhkoq3hqKW8f0Bkcbdr9PUGRWWYJ6mT5F0SlSgq772RX2GF92oOjZ-4BU1F17QG27X6lVFgpqSxTlS55x87tCTn5v8lPFHROj_2g1E2R9kcr8HON1R_eLbwD17bzb43unXrL_S_SYpI6haG8yTeexFzg533MJe48xp2HsOdt3DvKTcEdx4iiGR4RbmA-hoF5ZdPd-X9HTZtteUWU1y1a6yhUdpiq_BfjV2ywFQ6TJ51bDfQL8_q4HUyx42GRisGxuE3qtVds5tJjVGM-8WmW4kN07yxDu-9pewR1-22cbCCMrhGQfFFq7WmW0z1ut2CtKaPCdX4GFDbhgvQM9g1QmnQ-yiYDZli1mUKsqjcCui68Wxdf6d6NYvxbI1nykmkTePktrZp7bXBs62zH89muzydUbOdmWdp6Q5Ft1xaEHi2kmr2BLpSBlw_nt3j2WzN2MwqJdiGcul8_BpSN9hI2piNsni2YkooPas5XUtlLGem0-HZHTfvMMMzY2sU3TKywzOG3fLrWPaLKXTUjdqiMkFRGYeOPtZqDdLihmoDGlv1CBIjkrnsS7IuR0cBDnbB_l_E8jpL8qMlZJ5N9-OL5tJ61z10zs-HQZp-XypjNdCtj_E55m7XcBGf_8s-RORDsOuBddnJwQ4nsKs4jc_Bngugsm0-y3u-llQgkrfS76o1Fi5bXRikgzGAJCOQVZ0XNMdz5-evwNQT6OcO1a9U1sLpynveRmPmSlrY2WvWuAUT-P87-VEvPysKyiCPXRLvzRG8QmSxy9NlGs8El-1utpZt18GujbpOPWQ_ZQAcjwUWabFiuLEbDbRePnIh3ifdzx-kJ1O4cZbitfEUvBd2nKWD4HQsmOTZKsK0chnwXWL9xEFsdiI2rN4tMKwGgflYYFRAkb5PoJ8yCCyOAyzLKAEGl4vnXmBfEpAoHOWKLA9YFTKnjkoln7eqNVjSLZiGdpP8Aly4KtTt0Xfdvql01_47N9zOqRCuD5H8aIfet_b7MCndknANc_dM5XQpOGjhBFoShdF4199ar1LpD9S4imVIFlv6CEuva9lY7dLX-20ic1wpJboUvDdvbJaD8B6TyMSkLKIh7jWChzCWP6FsfpQOyy_9-PRPWOdUfJQr5Ue_iTIahyCjUV0dUI4Bll9-p8JVuu9GMccv2_kmwniMsCb1EcLSfO1B5ZcCNOo7tvlNpMkEabKi2VTRAGYC_8VxX8G0wp7CLu8f-q1lDz49hPG-CL5kMvHmDMkkPTY2zYskjUfG3sOW9vlgA-zx47YRnHE7V_IJtPFvPyc2n9D_fy0VD88NTJrvfb30STHavUbtrS6PCbiY6b1xg-nZxPQsIgkuJRXPP-DUTjNJI46XszF4av5Ldnrjrr2HG62aa1cCYCfYU83l-kxw5hPQ-YrVr_hrrraNAAv1aX7_C1gv5giHenDEaP9MWURXITtvU8nsZ7ngkpvNoj23ab3PqOnfSxrZmXEwkox27bRgAGnygpF1_VFyy6ngP0A_qFtgYmxl1zK18sj2y5vTAR7MGe30aZrGCdBjMF_8287Rb4eZau-AcmVB75-VLmVdWqt51Vowp4Z2g07X2omG-gG2jaAW3P4wSqYvzFoo_ZXKNTi2-03scoR1lAyEkTFhWZQWxZuE_aJV24wpcX1crl3vfQPs1MKBs35fOcfAiPH3MXs6frq8poH593HuWR04j8acRxEh8Cbnn_WiPxK6hdVHaUF3b6zvp_DNEa_6sWQMjHF9fMUdERdlynMxMBVPmSrg7ejsl_OIMO4y17Qq-Cl8ndR4P5mvAo4iK5nwVYVF9Cpfd7sukI54-3s4uiwLzs6BhXTCAgvS-lUWHlTzCZ5AnG5pnxv6rYUvVqNoPklmPgl-hZV7qzvNPYdt839U3QpXuClt761_7Ukvbb4zcDA_m5qfhMGr5i-4NvY_noMkDAYOxvVoSiA-sxD8FcEL1fPPq8A6MAPUUZkZp-GKVPkx1Lmq4ReQZXep05dUwFoLfVN_l3ApgD2EA8DxIXCc1xWtRkl4od2GLuszCC-OrdM-YAvH2BIIcxiT12n76F-rGZzn72VjLhynPcIB_6j8igtWBCmMi2ePdDDj6VDO5K-ZeeEU2yMbcI9KmIBBTZMVZixcbqmbenT8X2pNn32KmLMNPToKcSljjsdtZI6fFK8vDb_DN6CPJ-iTeEXxnup5-ODX_JEN91sqxO_ArNLuDfysKen4UM3JOD1AKXCt-RPo0zfoKBmngTSGuPBkHAndXwoutefT93ZL7HC0yKgQFWWPy5Ucp-tOcR8u83Cutlsq6-lqPes3f8nk2lTjtFMxOiA93KN6DN6phwnLJdvtwrB7qKjhbNndWPYUjga7hqXVlFuz756Io0K48Ff6qN8NKUeHNMMVrb_ZzATdVjVFJBuoIvn-fuc3VZ1xRjq9m4Hk-ALp3A1M1_O1lfd0BeJ5xOXrfrvoLVOHdQj1bBJWSRyNLrz_68LCH241VNvuXOu8__Mxa6QISP0ia95f9GTv21M5StSTiW7AS0cCrwwtf-5pbG_wEESTEoXQgMJ76fhNVeZlLn5T1SduxmfNr-Xfg-8byp3b_dXon6evD5CfTKKj6UBiPC6j0iis6uQlwLdHv0clwJm9_yXy_0YSL1p9emIG2sLJXk1z2lfy-1pjD9snjvLkeuulnfiC1YXDNCAe1XRBVaVVHmOH9XIqO6GDysldPynq4p13_X7KIDCeCoQ4wMulm7M0lmq7PDLoT6uA-EhFMnFsvKIJ7oRf0jdObKd0H9cYtPYXzV0Y4VVf8mPWR3j39RT-zu0Gw467sKkBh1HscLUG8OwJW4UNAOZHBbnTsS_EsQbbaglugbmZp9-2dd-9IbJoDh_BIbIYPqy7qm-iuogKegU3YRalUZwlSXG1uYkqmhJGoIqjvKrzLKiyIImCuKYZpRkrrvgNCUgShEEexnGSFNesiAuowqRK4ySDKkdxAFvKxbVbJNdKr6_8Z103ISFhWFwJWoEw_rtSQnoqCUpur_SN_xqsatcGxYHgxppBhOVW-I9RuxnJ7b__93FXrRY3f_0TuJ6upxvyzwAAAP__yL1sXw">