<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/62002>62002</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Crash with experimental constant expression interpreter on mildly horrifying but simple code
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            c++20,
            consteval
      </td>
    </tr>

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

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

<pre>
    Consider this incredibly strange example:
```
extern constexpr void func();

struct S {
  consteval S() { func(); }
};

constinit S s;
```
which generates this stack trace:
```
clang++: /root/llvm-project/clang/lib/AST/Interp/Function.cpp:38: clang::interp::SourceInfo clang::interp::Function::getSource(clang::interp::CodePtr) const: Assertion `It != SrcMap.end()' 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 -fexperimental-new-constant-interpreter <source>
1.      <source>:7:14: current parser token ';'
 #0 0x00005612ec8f183f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c6283f)
 #1 0x00005612ec8ef57c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c6057c)
 #2 0x00005612ec83c8c8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007f051d0bb420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007f051cb8800b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007f051cb67859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007f051cb67729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007f051cb78fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x00005612f01dfb26 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7550b26)
 #9 0x00005612f0217fbe clang::interp::SourceMapper::getLocation(clang::interp::Function const*, clang::interp::CodePtr) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7588fbe)
#10 0x00005612f01e2a64 clang::interp::CheckCallable(clang::interp::InterpState&, clang::interp::CodePtr, clang::interp::Function const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7553a64)
#11 0x00005612f0209e11 clang::interp::Call(clang::interp::InterpState&, clang::interp::CodePtr&, clang::interp::Function const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x757ae11)
#12 0x00005612f0207f33 clang::interp::Interpret(clang::interp::InterpState&, clang::APValue&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7578f33)
#13 0x00005612f01df59b clang::interp::EvalEmitter::emitCall(clang::interp::Function const*, clang::interp::SourceInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x755059b)
#14 0x00005612f03f8a31 clang::interp::ByteCodeExprGen<clang::interp::EvalEmitter>::visitRecordInitializer(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7769a31)
#15 0x00005612f03f9beb clang::interp::ByteCodeExprGen<clang::interp::EvalEmitter>::visitGlobalInitializer(clang::Expr const*, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x776abeb)
#16 0x00005612f03fb846 clang::interp::ByteCodeExprGen<clang::interp::EvalEmitter>::visitVarDecl(clang::VarDecl const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x776c846)
#17 0x00005612f03fb98a clang::interp::ByteCodeExprGen<clang::interp::EvalEmitter>::visitDecl(clang::VarDecl const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x776c98a)
#18 0x00005612f0178f6d clang::interp::EvalEmitter::interpretDecl(clang::VarDecl const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x74e9f6d)
#19 0x00005612f0177bc2 clang::interp::Context::evaluateAsInitializer(clang::interp::State&, clang::VarDecl const*, clang::APValue&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x74e8bc2)
#20 0x00005612f014f36c clang::Expr::EvaluateAsInitializer(clang::APValue&, clang::ASTContext const&, clang::VarDecl const*, llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x74c036c)
#21 0x00005612f00221a2 clang::VarDecl::evaluateValueImpl(llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x73931a2)
#22 0x00005612f0022510 clang::VarDecl::checkForConstantInitialization(llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7393510)
#23 0x00005612ef337fd5 clang::Sema::CheckCompleteVariableDeclaration(clang::VarDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a8fd5)
#24 0x00005612ef338e9a clang::Sema::ActOnUninitializedDecl(clang::Decl*) (.part.0) SemaDecl.cpp:0:0
#25 0x00005612ef0134a4 clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63844a4)
#26 0x00005612ef024e18 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6395e18)
#27 0x00005612eefed582 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x635e582)
#28 0x00005612eefede3f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.0) Parser.cpp:0:0
#29 0x00005612eeff47f9 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63657f9)
#30 0x00005612eeff515d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x636615d)
#31 0x00005612eefe913a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x635a13a)
#32 0x00005612edb1b138 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4e8c138)
#33 0x00005612ed37c119 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x46ed119)
#34 0x00005612ed300716 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4671716)
#35 0x00005612ed460ba7 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47d1ba7)
#36 0x00005612e9e67c26 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x11d8c26)
#37 0x00005612e9e63a4a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#38 0x00005612ed167e6d 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
#39 0x00005612ec83cdb0 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3baddb0)
#40 0x00005612ed16872f 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
#41 0x00005612ed13016c clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44a116c)
#42 0x00005612ed130c0d 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+++0x44a1c0d)
#43 0x00005612ed138add clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44a9add)
#44 0x00005612e9e660d0 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x11d70d0)
#45 0x00005612e9d71615 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x10e2615)
#46 0x00007f051cb69083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#47 0x00005612e9e5e75e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x11cf75e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
Live link: https://godbolt.org/z/Ps1qd7jaG
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzkWltv27qy_jXKC-GAF10f8uA6cU8XurCKpme9BhQ5srkri9oklTr71x9Qki-U7TTdJ-4GzgHSwhLJ4cw3w7lQw61VqwbgLko-RJS6koMEYyJKo-T-hndurc3dnBvdfOB1veHNTanly91CN1ZJMMitlUWqEQakKusXZJ3hzQoQbPmmrSFi8wjfR3gepXj86x9h68A0SOjGOti2Bj1rJVHVNSKieUSLiH0Y1_X_W2c64dAjirLxPRrXPvMaPQ5r_GBIAkXZ_Ugmu5-Q7JerRnmq9jAWsvljrcQaraABwx3YQVrruPiOnOHionii5s0qoh_8H5ujiC6N1i6iy7p-3sxao_8Bwj-O85a1KiO6nD9-i-jyU-PAtBFdLrtGOKWbW9G2EZuz3JMaVrB5xOZqmNj_ftSdEfCpqfSlGTtqw9MK3LAkovmFBQst4YszHtgeK7_73FowngqKUvzJoYiSiN2jRyP-5O0tNHKEnmao4qoGeTvg8eXzw_zxAdmu3CiHOCq7FTLQauOQ02jtXGv9pnQZ0eVKuXVX3gq9GfE6hU1Z24GN6BLxRnrrqzsJyK0BCcPtGpVcfB_0QxeoNdAaLcBakMiOQi_6ldxaLRR3IJHpGmSFUa0bWX7stSy7TbtXMr6NcPHF6JXhG8TNqttA4-yoYN32CtWbVtVgZrBta23A7JQ84zvo7MyZrvke0WWpmoMNeFtBs5X8wU01i9FshWba0-WttwXdubZztxbNNh4LNJtt83TG7WZmXxrHtxG797qr0ewRzWYrIWZO61qsuWoidv8qe36ybXhr19qhWSV0rc1MKr5qtHVKWDSrGj3rgQ1fWycjdi8G1ilGswq2LRjlUeH1rIEfs95weONmg2EZcGBQxBajGtjDACzxwAav2TyL2JzEvcl3xkDjUMuN9R5Hf4cGRTTzh5ZmozuIKMMIbzHGOEkJBZFXJGcV6g2ot2f7YocfX4xqXK_eb4ON5IdJhv940tYZ4JuIpt5OVON63-IN-12UHNEPeMtESnNW-bOy55-E_EOVZOIc_4saeNO1fzWPatXwOqJ51_ROXKJa-12uwS1OMhFwS0NumchFjhbeSr6C0M9gXgb2_os3svab5iOSwZyFbhxs3ejicP9vvwUbt8gqnBCJyzKmGD09GbBOG3gybpRz8J7bPH1K41mtmm47WzXdMNC6tQEub62-xb0sJI4pDiSJj7cRZZ5jXCLDlYU30BeectpTjhnGZUA5CSmnWZ4UiJf6TZwfUaY0T4qAcjqlnO21_maaGQ1pZiHNLK9k-ms0GatkGtDMj6ykwkRWJU3f2zqzJMElDfctgn0pyaoSXo-df_K2BbOPjp-14H24vBgfdwF1jI507r3FG2Pp-0OQ51UJewi8N8Eh9EB5Gl_kbw3i-4LXNS_rV1KCITV5dNzB6B1_Ju_FGWfQe3e3lSUJ42kcoEJCw8AFEHJRCl7X7wnGa5N-Dx4ZB0ICPOgEj6xi7BKPn3ZB_N8EZf7lb153w8A1hMsrxgLh2NT7JEV5SbiHZ14_bJRzOycAG-Vet4Bf8QDHCfow-zogJDgpygCEOACBVTlnFy3-w4sDb64P29Z8hCZii7eg9TC8e1ZWOR_YjfzUKKd4rf7VB_4jGp7wVU08SwvOQhNPJgAUJVy0gv89AB9rXfL6rQAs0D53u06imWUpLyG0iHQCSJnH6fUA-ZubexCTYzS-vLIpiDxOA8mzqeRFzq8n-X9M7CLngdiTLCzLq1S-2Q_uS7f_jDgxFFUqA3GKiThZKejl4NsXGKNLf-Z1xx3M7cXzGfjs82HsVOrfGOViyEtBj-Ggk0Qvrlgq0MTlHHT7E_mPuQ_Fevw2YnkUwH6Ky6F8fdzwuv4bhNPm06atfbXv5DDUcmXC4zVEy0MOHuzzhRvP-_3-LqI_dQ8jQ6XW9fXy7FhglooA_jCjxJQSTs_AElpgD3KPw_Htw_8NjFjBCA9NlE4xSgi-iJHwxchSm8V4ebS31V1B9rsBuyJQCcEBUMcZK1SMZZVMjtl8hA0_Ltn0pq3Bm5NRvnTzIHJzpnDdB-Fr-Og05Xklk0CQeCJIDgU_L8hcuL-a_27U3iPJ00AT8n7bcuNuPXDIk_GDpxdInokkYAITFvN4onS7C3P97yP85pUDs3vWZt7IuXNGlZ0De8rcMOnUJ57sIL_Bpq25m5YCF1cttfnKmxX4U3Al9bE8jnlQJtM0RI7GQPKfIvfR6K4NsfFjqln50ccWxKmoB_B2kfoMFAH0UwrTYz2Nx78bzCIBkgdgHmedABXIJKc_BfMvsysv76Hqy-rhrveXsHnbjFcVNBcCrPVjqlJgrgJZAkkeBox8Chmw6q0nN0CudytTb3gV4E7ywLPAHfmuQYbznqsI5a_irCpelf9hO1jIxQhwLZmvYA5pklXFsTmEn3agqhKSyFfh-Kbbz_AM9Wko-avl_-z6-7ggOdj7r69QHRKlswHrTy272idv2rhDiXANHFKSBJVP-IkIKigI4yc49J-R8ynrx5nfIQN8_6PMCQuKz_BDkSxJSVgQSnyN_RGa-dHX6YctiM7B-Gr8uP--nMaQC8ICP82C5EuyTBASHLql8SGqkWdYvRKTKUhCwqMQh0xinJE0hHPY9lOfPA8tCqeIXpbqKrYcpxnJSHAXw4LkTMYpLnkWlq09ywd5ns9-kjmR9ypOKc4kKXkWCBDkSAWkmaApEoI8bbgKy5S5MfyldywLseZH93_e0SxQ-I4u-maY68hBiMwFDRWRTeRgPOZoh_6CfOtdxatF16lQaVj8exqntwcFkkY9XwiBwadDkCTNIJVDm9CBbjUG-ifTg9uP7rp_xps4weu65OL7UzW5whv2Ho1oQRZ6s-GNnJ7qs0rcF5m69btzj8ERPs6oZjXGkUHD-wVPT2K7JWR4KLlV4sn200cUg8n-xZMzXDm7G56Q43XtD4U2R-N-yvzg4-fHDTz-j2Y135SSRzQ7QEXzXevAH7o8r49i-sFflvhIFec-6w8jX7vmkVdQvwRwvq66K_QwlFzKMqi2YzwxsTyjQZb5_85EJhnqJVuISQgcwyS8cgyA63XHT0LmDs3Am08W-gmXiuRXps5_xz1XHHNCwrvAmE5xEVj-Ki5_6NJeBuUPXX5WNryD_ZX7sP4r09tx_G23hh5NgYNsN2YTNHMuL6J5f_Q7yBzOpAyXtPAb0Xz_BCXmBZchfvEksKdYjreuuxRlx3_vVuYnd_aXwvb7JyUZlqFrDrLDQmYkJQnyXL_75hhoSoLLy3jaXVXgnKGnp1qV3hdz456OOHlrv1WM86A7IZ7kXQlkCaCB_vsjLKosOfQHHY-zOQJjfHwYu4tRNVYESIwGPPTyoh_KrRFslTcGCYiw2PPZWUCzZ-Q0sgBIHaXp42a7DB0ZcJ1pwB8hv_hs5_Rn9QyoVs13P2nSGKxlqWt3q80qost_RXT5xZJ_yuwf_OONvGOyYAW_gTuS5jjP0hynN-u7qkgKCkmesZwBkQykoAAlTjiJU5nnN-qOYspwjDMSE0bZLSZFDCmhVEgMGaFRjGHDVX3rj4Xf-6bvPr5LKcb0puYl1HZsnt-3wkaURnTh3-x61Md-enPXdzKX3cpGMa6VdfZA1ylXw12fR-2gPrTTol0rrX9rwFqlG3TcVasbtFG1rF_QWhujqhfVrFDZOWTVpq2hV9lNZ-q7f7_buhf5fwIAAP__NQDWNQ">