<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63453>63453</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] clang crash when evaluate constant expression
        </td>
    </tr>

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

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

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

<pre>
    https://godbolt.org/z/fW4jW75Te
```
constexpr int foo(unsigned char c) {
    switch (f) {
    case 0:
 return 7;
    default:
        break;
    }
    return 0;
}

static_assert(foo('d'));
```
```
<source>:2:13: error: use of undeclared identifier 'f'
    2 |     switch (f) {
 |             ^
clang++: /root/llvm-project/llvm/lib/Support/APInt.cpp:282: int llvm::APInt::compareSigned(const llvm::APInt&) const: Assertion `BitWidth == RHS.BitWidth && "Bit widths must be same for comparison"' 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 -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -std=c++20 <source>
1.      <source>:11:1: current parser token 'static_assert'
2.      <source>:1:36: parsing function body 'foo'
 #0 0x000055cfeaf267ff llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c3a7ff)
 #1 0x000055cfeaf2456c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c3856c)
 #2 0x000055cfeae6e528 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f6bd7059420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007f6bd6b2600b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007f6bd6b05859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007f6bd6b05729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007f6bd6b16fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x000055cfeae461cd llvm::APInt::compareSigned(llvm::APInt const&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b5a1cd)
 #9 0x000055cfee84a705 EvaluateStmt((anonymous namespace)::StmtResult&, (anonymous namespace)::EvalInfo&, clang::Stmt const*, clang::SwitchCase const*) (.part.0) ExprConstant.cpp:0:0
#10 0x000055cfee84a25f EvaluateStmt((anonymous namespace)::StmtResult&, (anonymous namespace)::EvalInfo&, clang::Stmt const*, clang::SwitchCase const*) (.part.0) ExprConstant.cpp:0:0
#11 0x000055cfee84e961 HandleFunctionCall(clang::SourceLocation, clang::FunctionDecl const*, (anonymous namespace)::LValue const*, llvm::ArrayRef<clang::Expr const*>, (anonymous namespace)::CallRef, clang::Stmt const*, (anonymous namespace)::EvalInfo&, clang::APValue&, (anonymous namespace)::LValue const*) ExprConstant.cpp:0:0
#12 0x000055cfee8918d8 clang::Expr::isPotentialConstantExpr(clang::FunctionDecl const*, llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x75a58d8)
#13 0x000055cfedaae4de clang::Sema::CheckConstexprFunctionDefinition(clang::FunctionDecl const*, clang::Sema::CheckConstexprKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67c24de)
#14 0x000055cfeda05350 clang::Sema::ActOnFinishFunctionBody(clang::Decl*, clang::Stmt*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6719350)
#15 0x000055cfed77b2dd clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x648f2dd)
#16 0x000055cfed6a5dc1 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63b9dc1)
#17 0x000055cfed6cccd0 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63e0cd0)
#18 0x000055cfed699661 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63ad661)
#19 0x000055cfed699f1f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
#20 0x000055cfed6a08c1 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63b48c1)
#21 0x000055cfed6a1236 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63b5236)
#22 0x000055cfed6a16d4 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63b56d4)
#23 0x000055cfed694fca clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63a8fca)
#24 0x000055cfec1997d8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ead7d8)
#25 0x000055cfeb9e6a49 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x46faa49)
#26 0x000055cfeb96b996 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x467f996)
#27 0x000055cfebacac96 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47dec96)
#28 0x000055cfe83d4fed cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x10e8fed)
#29 0x000055cfe83d0cea ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#30 0x000055cfeb7ccd5d 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
#31 0x000055cfeae6ea30 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b82a30)
#32 0x000055cfeb7cd37f 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
#33 0x000055cfeb79472c clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44a872c)
#34 0x000055cfeb7951bd 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+++0x44a91bd)
#35 0x000055cfeb79d29d clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44b129d)
#36 0x000055cfe83d324a clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x10e724a)
#37 0x000055cfe82d95c5 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xfed5c5)
#38 0x00007f6bd6b07083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#39 0x000055cfe83cbace _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x10dface)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWl1z4yiz_jXKDeWUBPq8yIXHSXZnz5ya1GRq99KFoGWzI4MOoMQ5v_4USHaE4mQyp-K92DeVydjQNP08NE3zQY0RGwlwFWWfIoyftJKbVsgI4yi7vqC93Sp9dSi9qBV_utpa25mILCN8G-HbjeK1au2l0psI3_5vhG-bv9K__yqy7xDF11G8jPJ4_PVfmZLGwr7TSEiLGqUiXPbSG8ER21KNWIQrFBWfBnmEEDKPwrItinDZvKhj1ACKnTlDkQbba4mKiEyEODS0b-2z1PhTa6A_AsmouH7-MuqKjxLH2uGvsdQKtqbGgLbOOo8mwgWPcBHhyv0em4Y0zL-SlVG9ZhCRm4gscUSWCYnIEoHWSrsPvQGkGtRLDqylGjgSHKQVjQCNIlw0rsuj5RhFxQq9yd1B4PATZTfjCLVUbiL8yf2SJYrwrVbKRvi2bR92i06rv4Edvrr_RB3h2_u-65Qj4XZ591naS9Z1DkfpkPiR9tJkGZGlFxg-MrXrqIZ7P_oRLr1zvBDFubPc1zltS0-3UBJFefxJ2L8Et1sUkeuIXKNvv99fPpe5ljmKMP4kLHp0ZQbtemNRDcjQHaBGaTQYIYzyXo8L1FDRAr8c2Lj7crO8v0Gmr3fCIorqfoM0OKzIKjSbC8Ju-_qSqd2EnpA0YUwPJsK3iEqOhGRtzwHZLSCmqdmimrIfVlMGEV6hTkOnFQNjgKPRP_DKt6TGKCaoBY50L5FhWnR2NPneUvYD8X7XHR0-vozi6k6rjaY7RPWm34G0Zhxe1TnLHA2iBb2AfdcqDdqVOVdY0APhZmF1L39E-LZ2IeJ24iloseGPVDeLFC02aKGcXtp1Tntvu95eGrTYOS7QYrEv8wU1u4V5kpbuI3ItpIUWLe7RYrFhbGGVatmWCunG9C3znLCRtDNbZdGiYapVesEF3UhlrGAGLRqpFp7YsNhYHpFrNpiOYxRMP09Y4gibzcokcX8caazXGqRFHdUGNLLqB0g3CWcBYZyQ-JSuiCxJ7nQ5HUJuUNNL5r3aBVk_o100OczpCJMYxfs4juMsYw3QBudF00zminkyw4c7LaT1PvB9cKTyWUjTx7UyVgPd-cmxcnPTxwUXtz7EEyL8Kd4TRmjRuIjzbH8ysz_NcnbK_lULVPbdV-nCAm2n60OrXC_nsLbMchZYiwNrIYcMl2jlXOkbMPUA-mkw73cqees6LUcmA5mVkhb2h3AY-3_HLsjYRdHkNS_irEpxjNZrDcYqDWttR5xDhN2X-TpPF62Q_X6xkf1Q0dmtBsovjbqMPZYkTXEcIEmn3eQ1zuO4RpoKA-_Qz5zm3GtOSRzXgeYs1BxnZVYhWqt3WT7RjHGZVYHmfK65OI76u3UWONRZhDqTvOH5r-kkpOF5oLMMvSTNE8bft9TNhMblbbLUfbiT1xlNGA_Mr6bmQ5nSIs7QzQNte2rh3u6st6GkUsmnneoNknQHpvNRpRqsd1LfwLjsaggoP5F32j_LRo3Sg5VHTQcalvM6n8WsXK73LOE94rKj2jrfr9DNvtMrV0vliRnnIlA8x4uz5t-MN5nhhSpP0BCxbsflZkVbF2Knfftl6oti1NXPDDs0uwbWBsb_hIYvf9K2h6DFZAZoTZ--QROR1aQrB--5Abl5Ry8OjNPzE6L_30O2vPMw3jfyLyC_Z8RwOGJVUvISzUgZPglzp6zbAdD2oNJXBmP56nA9k3-_o237JzCr9Odd17o8xWVHrqqjQodj8qZv3FHtrLk-Zlo-1bkZg9oHh7Mio1nJy2M4c-SRKXmcUkg5BI4AOzo6yhbYj9VhK_rMUiOkGJC9i8V36P4vIfkZ4OcFwymHAH4awo8zksWnTVwy-1XeCinM9oDtk-JPIWqH9gROHyV9aa1UexZoSUWyOICWBdCKosacz1zPgJ58PsC6t9SC2-y8F98LTfdMdXAeH87TssGcB0jzAGlOM86SdyF9zXnvhv3FtT82oFbpl2HthU7-HXZdSy24MDhJTV5t9YVaGFourdVfxHTF-lDGSF1xlgSMFSFjjDEev4nOUfGbVn33KlH3HbCXgJ8pHNP6U4R4AkTdW7fLf7Hkz8LnW853q_Q3KjfwWYqzkQkx4-FEK0MyqyrP33Y_R8rXaQT9LC3oYd_2S9y8T-LNAVoyBsa4On8sdhbKKM_z0P-qOWVN0vyUMudHQsmvP117zkLc3O9OEzdJNQcMJ1MWHM8iVlz-JGLd7AcPmfDwz2A-RzhKyzAc4WRGR-J2s2_R8V11X-AB2mE9mvLwtaP_08OdnSVhx_jlU-abE2HmuND_t-J9C593ndLWL4VnWshInWGSBzzgOQ85T99eyIQ29l9CRs7TgAwyixFpw-gLMpb332c7MWf6AGjItc6XcxFaNowGNgfpJEuqqgi3IivF4TeQSx--DrsTYL2FsciZ-OGWpkB5Eeb9OMgO6wpymlbBplW79VryE6aeyci8oTStAiPz0Mi8rqo8pHPo9rPfyzE4zejrqM7iy2leNFUVTuwg36opoywEMpr8jOfhmO-Ub-E9S4ROCw5sBiDIcUrC0wY4YixZ76jTUZ4-mPBXk-FpRFiGV-hBCX4eHEkMZQPBVgFXMxwxA4oO7K-S7z5UlG_t9F-CysPDAadjTHaDE0quxcMr-UB4T1EXjPGMe2Ymeg-XHWvtyfW1w1QcrkcismS0bWvKfqwbGUb8oe_RiVbJSu12VPL5rD45iMeTDdW53qnjYMKP1UJuxnVkGOFjg_Wa7ff-Aigiy5oawdbGi48sBsKuYG01FdYcqmfqaNu6SaH0pN6JTPbVy-mlp79iLFq6qzn1d8sHqnB5uBP5Q9WnxyOZ32RQEk-G4tR9xVDzrZf3tIH2KaDz7aE7w-VMXWJKgl1KeDlTF4yTIki5_-NcZJauv-oLJCSuSgvMXiXOjx19sWQe2Ayi-ayhE3jt3OAN0WWQ7ZzpIiRNaVlgFjhUOuMlS2r-q7z8oWrzOil_qPqLMDYg5VcOYf3t4vt5fD55PT-bVVIHCxPJZmxyXL3K5vXkc5A5nEgZXhuFf5DNj09Q0jrBVchfPlvYCU7H3cIhRTnY78PK8sWZ_mvL9scnJQVOg10DCbLDEvMqYxlyVn905w3wjGVB3-Xs1riIS4LW61bULhRTbdcTQ957j5zGJQl6maVdrKYM0KD_4wnmzXildOpp1vFxmC9HzbghQGz03-EhE3oUdotgL5wvcEAJSZ2dvQG0eEBWIQOAxCRLHzs7JOjjMzhwM8g1nj1gu-BXhFekohdwleRlkeYkLrOL7RXjAFWRxKQoIMlywjnFRVbyJK7TgrD0QlzhGJM4xzip0jTNLuMMZ3lSZpQlTVpAE6Ux7KhoL51nXyq9ufDPp65ykmbkoqU1tGZ8uCjhEfnK8eWivvIPr-p-Y6I0boWx5lmLFbb1Lx4HPrPrkcDhCdbjFiSC8VJ4mD5UWgT7ToMxQsmLXrfzV5C_8PLLW_9_AQAA__9acsR7">