<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/146512>146512</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang] ICE with large constexpr array of std::variant triggers LLVM ERROR: out of memory
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          mariete1223
      </td>
    </tr>
</table>

<pre>
    When defining a very large array of std::variant elements as a constexpr local variable, Clang triggers an internal failure:

## Stack dump

```
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++ <source>
1.      <eof> parser at end of file
2.      <source>:2:12: parsing function body 'main'
 #0 0x0000000003f78848 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f78848)
 #1 0x0000000003f764d4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3f764d4)
 #2 0x0000000003ebb048 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000079f5a0c42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000079f5a0c969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x000079f5a0c42476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x000079f5a0c287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x0000000003ec685b (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ec685b)
 #8 0x0000000003ec6875 (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ec6875)
 #9 0x000079f5a10ae9a3 operator new(unsigned long) (/lib/x86_64-linux-gnu/libstdc++.so.6+0xae9a3)
#10 0x000000000748b1dc clang::APValue::MakeArray(unsigned int, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x748b1dc)
#11 0x00000000078a4205 (anonymous namespace)::ArrayExprEvaluator::VisitCXXConstructExpr(clang::CXXConstructExpr const*, (anonymous namespace)::LValue const&, clang::APValue*, clang::QualType) ExprConstant.cpp:0:0
#12 0x00000000078a69fd clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::ArrayExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
#13 0x00000000078a869d EvaluateArray(clang::Expr const*, (anonymous namespace)::LValue const&, clang::APValue&, (anonymous namespace)::EvalInfo&) ExprConstant.cpp:0:0
#14 0x000000000786a280 EvaluateInPlace(clang::APValue&, (anonymous namespace)::EvalInfo&, (anonymous namespace)::LValue const&, clang::Expr const*, bool) (.part.0) ExprConstant.cpp:0:0
#15 0x00000000078ad3c1 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+++0x78ad3c1)
#16 0x00000000076cad42 clang::VarDecl::evaluateValueImpl(llvm::SmallVectorImpl<std::pair<clang::SourceLocation, clang::PartialDiagnostic>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x76cad42)
#17 0x00000000076caeba clang::VarDecl::evaluateValue() const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x76caeba)
#18 0x00000000069d1249 clang::Sema::DiagnoseUnusedDecl(clang::NamedDecl const*, llvm::function_ref<void (clang::SourceLocation, clang::PartialDiagnostic)>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69d1249)
#19 0x00000000069d2d0d clang::Sema::ActOnPopScope(clang::SourceLocation, clang::Scope*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69d2d0d)
#20 0x0000000006625815 clang::Parser::ExitScope() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6625815)
#21 0x000000000673b351 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x673b351)
#22 0x0000000006633bd3 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6633bd3)
#23 0x000000000666987d 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+++0x666987d)
#24 0x00000000066276be clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66276be)
#25 0x0000000006627e69 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6627e69)
#26 0x000000000662f7aa clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x662f7aa)
#27 0x000000000663077d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x663077d)
#28 0x0000000006622aea clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6622aea)
#29 0x000000000492ed48 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x492ed48)
#30 0x0000000004c28c65 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c28c65)
#31 0x0000000004ba5ffe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ba5ffe)
#32 0x0000000004d1b441 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4d1b441)
#33 0x0000000000d8e81f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd8e81f)
#34 0x0000000000d853fa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#35 0x0000000004995b49 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 0x0000000003ebb4e4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3ebb4e4)
#37 0x000000000499615f 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 0x0000000004957f8d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4957f8d)
#39 0x000000000495901e 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+++0x495901e)
#40 0x00000000049614d5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x49614d5)
#41 0x0000000000d8accf clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd8accf)
#42 0x0000000000c41924 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc41924)
#43 0x000079f5a0c29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#44 0x000079f5a0c29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#45 0x0000000000d84ea5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd84ea5)
```

## Program

```
#include <variant>
int main() {
    constexpr int size = 1000000000;
    std::variant<int, int, double, char> numbers[size];
 return 0;
}
```

To quickly reproduce:

https://godbolt.org/z/M1MnrGWsh
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzkWl1z4yjW_jXkhnJKQt8XuXCcZN5Mpd_OJtmeuXMhhGw2CDSA0s78-i2QbH3Yzkdt3Be7XenEluDwPM85HI4QWGu2EpRegOgSRFdnuDFrqS4qrBg11EcoOMtl8Xrxx5oKWNCSCSZWEMMXql4hx2pFIVYKv0JZQm0KEMxBMH_BimFhIOW0osJoiDXEkEihDd3UCnJJMIeuVc4pQAu44FisoFFstaJKQywgE4YqgTksMeONotay535QAFAAHw0mz7Boqrq7HHvdjzcf3HO9vHPgZfdKrhSuIFarxqECwRwCdCNrA9ANkVXNOFUzuqm5VFTZaxbUDGtNlWFS6JlRjXgG6CZnYnsboEuALuFsVfzEqpyFcLaCM2nt4rq21htTN-Zcw1nF-UsFZ7NNGs-wrmb6VRi8AcGVZcrhrBRy9kJVLjW19-HsEc5mK0JmRkpO1pgJEFy9idc21gLXei0NnJVEcqlmBcMrIbVhRLdjEIX1enx5A0nHAwQLLRtFKAiugTf3rXAgWFBZguAa1lhpqiA2kIrCerxknAJvjrpmfddgjkAw9-0v18sGTdkIYnWENqAgQEllOaEEeNYPgQe9jbf9F5RJmoYptJq1MaVfdfvhXjFhnIefFCYUoLRvpPDPpdRGUVwBFNvAYsIAlEGA0i9yNUCX3qaDB1DWgfcn4OOwCA-BX3CKRVN_F49sJTAHKG2Em4AF5NIOcQqoFkwPFY2g0jz3whQubFA8UCLtvG6x_R8WBbcjpp2GozYLKQzdmHNS2znmuf-t_aCzn2RlhD0Sogh5HSnOcoBuNmm8jMMZZ6LZzFaiaW-Qcy3PYwfZdekBh2ODWZyVBNZmrSguls-M889Zd_1769EUbpjEcKWdBJ-FHSZxbzgeG0ZpUgYQ51KZz5l1HXuzydh9JE6j_MtjpjXbD5ruDZpEJxk0ifpBs6GAvodphgMoa6qwkQoK-vP47HlLWm2KLtv1Gjvb7ch2Mo9SURKmuV8Q2OJ1s3h-_wPzhrZfvuFnOrdL4BCOmzILOP7-5XO7g9YDH6WhJMUh8pyfsJDitZKNhgJXVNcub2YdGYv9elOr6xfMG6tte_0H08ws_vxzYZdt1RBj2wCUDnSY3m2XeIDmlvs7w945Cbc9XK4-oHBranDjHw3mT6-1tQPtkG58LKaJyIqBJmLEWVkMTT2ayjiSUl1iTUGw6BN2hZ_p0mFb1kZ9gM4BFdEC5lLydjncCjoW0EIYiPYupWBCKY2zAnYj7oJwYP9ETok_YMqiuhWldK3fJRaOicUYpd6O2K245-1K_yVg_kMV9jR1Tm4n93mNlTn3PkA4mniyCIg_HaXH7tyrbwUzDHP2N1VvaTG88fjULdTH2PzA6ooSPiLUT4PHCnP-gxIj1W1Vc1vibWv8GjMFgsUwmF31dycJtrlrMs49Vhb71a7sdNPiugO0ldCh-PIs2arbZ8l4pH1McBGiA5q0X2gnv1PYiTAsOP87BGol6AVKpgLRHH9MIIfshDBpjnuYo6okzgofhdkowdMKt586Vek_RaNp4bCPJtD_46q9fGQebB9dloqWIFi8SFbASSb_nG9tqrk-QUXQqdBrlE00QoVXHNZoTsx3cS_rRyJr-glyXfv5adhYvDs2aFSYxTGKUj-aCK3pNm9umNlyOQW2dvQe26j2ipMgDyL_GDb3-aYLqkeDjdsnuZTFZP1uI3VaA-1Z6mjGp6DZEulporELgiAvgg_RvHKbR20ApZMOTKwsVazawmm6SO3ZLJ5oVXNXGpTy2NI27HWHDW17zo1Rd2xXcH15VDhBermCsVxxlibFm9SsDr8p2dRHVXqsKdln2-vXrfiH1HDsWd4Yqj-r8n77aVZ4K0xvpHrAYkVtCXMq5Z22vfLhJFckcU7fVf67GoTrbbcFue-JDwj5bos3vTknhGpt77GSWTlOkb-sIr1e0VQvGmfv6mUjjkkxku3oLP9y1aYR92tUo3G_vqJ4olqZYPymatebNqgG6v0apU6hhWXba5FMlgYveSfXPcn6jr5Qvl-Qfa_xXw29N5MKepccH2wddn0gJ-3KmW-yaLgt2KUyboU90frY0uxFSCcBgTDdD4j549OkwrK4h6X-6LHyi71mIfWARxVimCFahOkQ8EIW9Dcq5m56b0srShpDu0snKa86IDuY49cDIUEpiUel342yy54oDuA8EcIWQ49wVACGOY7Kko6FbMe8dZsChB7W8jilk8Rvh7NnMarvwsLPw3CyMeHw9mRedgVA-hbZk6SgDl-PflRueUVKU7-EhPjL9l3T4Mnd7Za5NLIgazzY0bFpZQHH19AC2me-05BoUfYcwgmHKCgx3Mq-8J9cXnhzD2KfUDx-nrU29jeGMlgo9kLV_nZVEI2TRBblYeYkef8huXvWdU0I5jzH5HlZinFibwfuQmfhL2RVYVFMZ_FB7-02XGRtR8d8tJH7aBQTq265aF2767Bcks3G99svOdaMLLVr3kk4amwvLI3CzOjt7Yk5zLmdClIN7tsmg03C-W5zpO0CUMJxlRcYoKSXCqXbtxm_y_yAM-LpG7yQDl82HnpP1955aMQjLil_HWn5tt9O8EayRdwHfDIJrtiPSvi_HByTreTDUZCOVYuSMi2Oqua8hvdWxq2Uo9Q96WgbHHvEfqPp_FfsXHa0-1CaFDNR5vn0s6L8LnN9XJHfZX7H9Hg__TP7wd2bwY-K-Ms2gTuxdlKG44Iri_2wiI7Bvhp8HhUIByqDYy74hVKeoFp18vTi-ZM1HBPSpbRtJbIF71LJfG_H-dgK_eW1h0XW4x5Vfx4J_QyF0CL-6oFb0_3Ak1MjKCuyT54acV16g-HUIA09uFzaPkttsDLLAa0PD0HDwRDRxMkhxRFsjX-9n6zxbujBSbf-PFx3vG3_MBxAAROENwWFdnVvj-a1x7uYMLALRxdbySXw5hDCwVE920Szv23fK-jvyIJg23R66K-fl92fQjbdIb9u3YOiqXKqNIgurWUQXXXWFDWNErAzDpKrfbJPEv7VMPLMX6GitZJFQ_qTgWtjanfOCt0AdLOSRS65OZdqBdDN3wDdfPO_CfXbH3p9VlwERRZk-Ixe-EnkB4nnpdnZ-sIrYy9CNM_LJIs8z089PyrTyA_CzItQGJyxC-ShyEs83_dDH6XntEBZkPtRGhcBwhSB0KMVZvzcTmU79hnTuqEXfhhHPjrjOKdcu8OWCHVORiC6OlMXtsMsb1YahB5n2ujehGGGuxOabY_oCt4uruFPZtbdEczeX8cPY-4OV97d_fgGrx8evj-AYA5lY2zzilZSvZ41il9MZGRm3eTnRFZ2Otj81P6Z1Ur-ixIb346hBuimI_lygf4dAAD__0tk_zo">