<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/59034>59034</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang assertion trunk crash on va_arg (aarch64)
        </td>
    </tr>

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

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

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

<pre>
    https://godbolt.org/z/Mqnaj1fq3

main.c
```
typedef __builtin_va_list va_list;
#define va_start(ap, param) __builtin_va_start(ap, param)
#define va_end(ap)          __builtin_va_end(ap)
#define va_arg(ap, type)    __builtin_va_arg(ap, type)

struct T {int a;};

struct T A(int x, ...)
{
    va_list args;
    va_start(args, x);

    struct T val = va_arg(args, struct T);

    va_end(args);

    return val;
}
```

```
clang: /root/llvm-project/clang/include/clang/CodeGen/CGFunctionInfo.h:349: llvm::Type* clang::CodeGen::ABIArgInfo::getCoerceToType() const: Assertion `canHaveCoerceToType() && "Invalid kind!"' 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 -S --gcc-toolchain=/opt/compiler-explorer/gcc-9.2.0 -fcolor-diagnostics -fno-crash-diagnostics -target aarch64-linux-gnu <source>
1.      <eof> parser at end of file
2.      <source>:8:10: LLVM IR generation of declaration 'A'
3.      <source>:8:10: Generating code for declaration 'A'
 #0 0x000055d38026d764 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
 #1 0x000055d38026b4fc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f7c4fc)
 #2 0x000055d3801a6e48 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007faa6dc83420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
 #4 0x00007faa6d75000b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
 #5 0x00007faa6d72f859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
 #6 0x00007faa6d72f729 (/lib/x86_64-linux-gnu/libc.so.6+0x22729)
 #7 0x00007faa6d740fd6 (/lib/x86_64-linux-gnu/libc.so.6+0x33fd6)
 #8 0x000055d38088613f (anonymous namespace)::AArch64ABIInfo::EmitAAPCSVAArg(clang::CodeGen::Address, clang::QualType, clang::CodeGen::CodeGenFunction&) const TargetInfo.cpp:0:0
 #9 0x000055d380886425 (anonymous namespace)::AArch64ABIInfo::EmitVAArg(clang::CodeGen::CodeGenFunction&, clang::CodeGen::Address, clang::QualType) const TargetInfo.cpp:0:0
#10 0x000055d380a9450f (anonymous namespace)::AggExprEmitter::Visit(clang::Expr*) CGExprAgg.cpp:0:0
#11 0x000055d380a96103 clang::CodeGen::CodeGenFunction::EmitAggExpr(clang::Expr const*, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x47a7103)
#12 0x000055d380a3cb4c clang::CodeGen::CodeGenFunction::EmitExprAsInit(clang::Expr const*, clang::ValueDecl const*, clang::CodeGen::LValue, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x474db4c)
#13 0x000055d380a473f9 clang::CodeGen::CodeGenFunction::EmitAutoVarInit(clang::CodeGen::CodeGenFunction::AutoVarEmission const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x47583f9)
#14 0x000055d380a488d2 clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (.part.0) CGDecl.cpp:0:0
#15 0x000055d380a48b90 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4759b90)
#16 0x000055d3806df4f7 clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x43f04f7)
#17 0x000055d3806f34c7 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x44044c7)
#18 0x000055d3806ec83c clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x43fd83c)
#19 0x000055d3806f2dc4 clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4403dc4)
#20 0x000055d380751d9e clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4462d9e)
#21 0x000055d3807642d4 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x44752d4)
#22 0x000055d3807c2e69 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x44d3e69)
#23 0x000055d3807be0d5 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x44cf0d5)
#24 0x000055d3807be773 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x44cf773)
#25 0x000055d3807c74d2 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#26 0x000055d3815a3c59 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#27 0x000055d381595a40 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x52a6a40)
#28 0x000055d38286ba14 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x657ca14)
#29 0x000055d3815a0c28 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x52b1c28)
#30 0x000055d380e319d9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4b429d9)
#31 0x000055d380db84ce clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4ac94ce)
#32 0x000055d380f170c3 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c280c3)
#33 0x000055d37d76aae4 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x147bae4)
#34 0x000055d37d766907 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#35 0x000055d380c22549 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#36 0x000055d3801a75ea llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3eb85ea)
#37 0x000055d380c22d9f clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#38 0x000055d380bec0f9 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x48fd0f9)
#39 0x000055d380becb7d 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+0x48fdb7d)
#40 0x000055d380bf661c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x490761c)
#41 0x000055d37d7690f2 clang_main(int, char**) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x147a0f2)
#42 0x00007faa6d731083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#43 0x000055d37d76223e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x147323e)
clang-16: 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/eJzlWllv4zgS_jXOC2FD9_GQB8c5JoseTG87yD4aFEnZ6pZFDUWlnf31U6RoW1TkXOveHWADJ7F4FOv7WKwqisw4fb7cSFk3E38-8W7hs-Y046WccbGGp3_D7-9_Vvi7m__pT5zriTPv_m5xUc2IKYkc89GP8rlmlOVotcraopRFtXrCq7JoJDL_J_6V6ej50LComKppJBZy4iW4nngLVGOBtxMvtaWMtxkRxipqmqXo8GOJ6rUY6Y8VejOMwmPkWBJG2vQZaqRoiUQPaBJfFZVEWMGOr4_g7VYwfqKa7ZS42Wx2lBabDkqBPZMwdnOQZCoO5Kg6ELJTIuzRVMvDiE-4RBP_ugfXdNy3GO9_5E43H2simGxFpQY4VgLyMWMZLSQlrtZgkQisT3AOoG7L8mk7rQX_zoh67Fp4t0VFypayXsmCU3bHKvXt7ratiCx4dV_lfLYBgX6QKrFKmDJ4f_6g522O9iPCZy9AP8yv7udirfp3z2smF5wJwh541zVRlkF4pax6juZNw4QaEQEWgqvf8BMbaT_xIvjAP---ApIKin4UilIXSiZejHJclIzOOjK-frmZL29Q02bbAiYeZe0aCK65kEhyNFi8hdy02YzwraHsJXNF07QM5u0W4Yoiwx-SG4aIwM0GZZj8kAITplcYDCQ4YQCLooa3oitWPXHTcFJgCRWirVBDRFFLo_JSghBE222tNNNFDlSlXwVfw5JV1ttuWSUbM8e81nPKtzXgFlO2q0sumNjP6hTvaW2mYJrVD6jIimpfjaZr-hOLfBrANzTlSiKuayW3lXUrZw2aLtF0uiZkKjkvyQZ8Fxj-qwOrxunMmzlomhMOpVNa4HXFG1kQkJdXfKr5sothBYKFIIwF2UTBtCyqdjddVy2ss4Whz7_pCHEVIVDMeA5lypcBRoQlgsWFeI5y0Khr6ZmWRwH-PIFf11H0ffny-Du6_4bWrGICa9uD3pQBNeYRLArMI-6E-a8KuzNCgFQCywDlXJwWBU--g5ydAz9hSP3E8SIaRwH6KsCRaRt4UIa0LNYVLn8DoykVtckTL8DW52ohdFXNjNTKUhz9e5DtDmRnQU56S7d5bsyCLRmu2vqPqpMGI7RVA1_BMkuufIJacMl_bGYT78rZ-XlMQI2Dc1Z6epaeLo5YkKCFMo5vjPAnJp6HDAA9SiurzYJXku3kOBW-GSLOMY4oSfzAcyAYCdZIQLACV9AhLIsM_u6SaNW3vq6ilhvBMJ01fOZoLG4AUiwkgTVMHMLXDAlcNOwd8omSHGnJgQ8dLcmhLdnLkzBFOOPv0rwn2fOgoyU5GkqOD_P9bpnQxZIZ2zIDJ6fRx2T6PnSxZCaWlSRJ5Pq5kokrXj1vedugCm9ZU2vPm5roM9d-BILQMQLdQBSYz78ulo9Qq6L2ydBFKdiHDui9Jv9scdlFosXJoGce9tFTRysT5NCD9nA6oI5aajqEGXjhZ2G-hXBMz9Oo3uLjPQiVV7JdHk6D0Hl7Itfrm10tFCgJHkCXPRZNIW10qo3xjIs79QD9xpVwB0pEruO_ez6PdtSp9VIJk9EoVV4hdL1-xGXLliWXZ3WyQYxjwNPPzF3byWKfZAH5OGDNaXNfjRF_CrPGeA1B8F2kfNHNVYsMUo0z0xJQQG3R4tu0BLGfp5-wg1byRyxe8vJ2d9MVpDSNyhAMR9GZkYcJALOQBwPkSUK9jyMH1dXU2qhN4RDLDHI0qWKnWp2qwfjSDIeKZanzccVeajWm0tnoTUFJi97IQhHRPMjjz6FYyq18iUSV_iI0fu6Ashaa2EaT-wH5BJplsa1L9hJPH4t2DsckdS4Efv7GIMVf9DrMpey5G8jBz4o_cAKAZ-G3k4-IQQb5Ce_5t0cOSRcAs5Cng5n3KAk-jnwBavG2ogrvv2CPDRvLJeF6P2_JOrbq2fY-FPwvImng-AC4z4hn5y9x6NKUfZyRfckVp8-v2sRZ0UQeKGuhsRMh2H169IPza_a8TFXaSO5KnuGy88R90z4mnK-mAvb7p1_k7MB3A2KLEjtVionHojdzgt85bUt2nN4O-l7_a_VetOggv4egrtxkQue2AeoDHguwnQTFGXNo-DnAfyugJAccFtBgCDSO38z6x4GehndmCKChBSEcGCfktG-mbUMID7z-wp5YOZ4jHSein7D1JY3mbZ6V8bghbDHC9K19nRGr_AcX95AddMXdm57X1bwTvK1VfATtOrWu2qKkTIxrF9vapSEOrKzyCpMfrKILmI92u99iflSPs8186OEIFLRm3spBvCTKsGt56q_qDeh8-TCIJmyLB1H07BurKIwJKGNpmw6swSEA4KWdzvthccdIK5kp2r_pPxujmUu0zIOOg5evDJIdajn6W6HeKVZ0RMlzqxdkgQejW-rZoZlmSUAGiUY34D3ERVwRNs7iaTznDqWYpAGxsovBq93cjR1iOVyj7BHJEyf4peIvkJ47VoBlgGaW6v2gGNM4wpjBciPuSp3cwsjjmfoGD9JzSG-sMijovb8_GwI3iDNQ0EIQDBBEqROjPeML90G7gR6O5RaX5SMjB1c8AkebDBXF0wk_69vxiXheGKQacS_q5yYtWglNmq7tFlR3ngIfAqqok7RVXtkboG5sYxYLFyxjC056uDZHJ-dY-Eethlenq73CpRRFtdZNb8zUNdJIXq3Ibue63UOGm4KsGt3ckGQ1VgUrKXChzue66oE4AKfsnItevWoyP7rnef9cVH28uMTbjGJ1fHTgCpCaE5p_8Gx8QuwXES6OQ4Z7czF2htLVfGurJc5Z-Wzx-frcnfWoiGUJ6GqZdDy0Lprm6P_aOgZ52kkzsN9gZIw49otOizk9bfhF0NvTafnmQUfVwNq7v6_p3MpRetjO5OCTnDr2C9DBSQswksX0o4wA3c1pOqD2i7ps0qfjNXd7sIAaF2ry9THn-xk0ZvKreQSa-jwGdhaV5VHkklM6X_e-W7F_JOif4v-_yOM5UwwIvkCMxZw7CNCpk5u93D7J2Guuncj8FyQNGIa0dNpnbObo1nedxEerlTqd7S5IadU-eEAcgBBrlGFy5Xk-Q538s8LzQe5h4K6jG8GcIyaE8q_m4hLKTWYMRtAZQ3eDCP0s5AaxXSG76xwu5FTqekTD0PRJ3R5qGENFL2k1I-3zVXORiylzVJ0Hl7Uu2KUbRUkEfwLvgl76NPVTfCELWbLLhVbsABNplOaOEa_MpTO9v-4uy8DgF60oh7cRP3ChKUwdP7jYXCYhrEOSUEwJc2EbEmbMjyGzx3EchQl1L0qcsbK5nIRXE8-r2E-kRai7V-H1RXHpOZ7nui7A8mPPnbEkdqE7zjzwsZSySeDAnrQoZ0oPdU3yQlxqlbJ23UClup_XHCuBAXUXhenhQD5u5YaLS559__m8udAjX2rN_wJi5LJz">