| Issue |
173773
|
| Summary |
[Clang ICE] LLVM IR generation crash in CodeGenFunction::EmitVAArg for variable-length array in va_arg
|
| Labels |
clang:codegen,
crash-on-valid
|
| Assignees |
|
| Reporter |
AbyssStaror
|
### Link for quick verification: https://godbolt.org/z/fdd46TWcn
```c
#include <stdarg.h>
#include <stdio.h>
void vf_caller(size_t cnt, ...) {
va_list args;
va_start(args, cnt);
for (size_t i = 0; i < cnt; ++i) {
int *a = va_arg(args, int[i]); // need a flexible size vector
}
va_end(args);
}
```
Go back to `clang 3.1 (assertions)`. Share the same error path but distinct stack dump with https://github.com/llvm/llvm-project/issues/111610.
## Stack dump
```console
clang++: /root/llvm-project/llvm/lib/IR/Type.cpp:319: static llvm::IntegerType* llvm::IntegerType::get(llvm::LLVMContext&, unsigned int): Assertion `NumBits >= MIN_INT_BITS && "bitwidth too small"' 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++ -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 -O3 <source>
1. <eof> parser at end of file
2. <source>:4:6: LLVM IR generation of declaration 'vf_caller'
3. <source>:4:6: Generating code for declaration 'vf_caller'
4. <source>:7:38: LLVM IR generation of compound statement ('{}')
#0 0x00000000042ef648 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42ef648)
#1 0x00000000042eca74 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42eca74)
#2 0x0000000004231818 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x0000787a79642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000787a796969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x0000787a79642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x0000787a796287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x0000787a7962871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x0000787a79639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x0000000003c4ed59 llvm::IntegerType::get(llvm::LLVMContext&, unsigned int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3c4ed59)
#10 0x0000000004ab94ff (anonymous namespace)::X86_64ABIInfo::getIndirectResult(clang::QualType, unsigned int) const X86.cpp:0:0
#11 0x0000000004ac12e6 (anonymous namespace)::X86_64ABIInfo::classifyArgumentType(clang::QualType, unsigned int, unsigned int&, unsigned int&, bool, bool) const X86.cpp:0:0
#12 0x0000000004ac3122 (anonymous namespace)::X86_64ABIInfo::EmitVAArg(clang::CodeGen::CodeGenFunction&, clang::CodeGen::Address, clang::QualType, clang::CodeGen::AggValueSlot) const X86.cpp:0:0
#13 0x0000000004b45adb clang::CodeGen::CodeGenFunction::EmitVAArg(clang::VAArgExpr*, clang::CodeGen::Address&, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b45adb)
#14 0x000000000467e8c1 (anonymous namespace)::AggExprEmitter::Visit(clang::Expr*) CGExprAgg.cpp:0:0
#15 0x000000000467f1ae clang::CodeGen::CodeGenFunction::EmitAggExpr(clang::Expr const*, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x467f1ae)
#16 0x0000000004658fd5 clang::CodeGen::CodeGenFunction::EmitAnyExprToMem(clang::Expr const*, clang::CodeGen::Address, clang::Qualifiers, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4658fd5)
#17 0x000000000466a62c clang::CodeGen::CodeGenFunction::EmitMaterializeTemporaryExpr(clang::MaterializeTemporaryExpr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x466a62c)
#18 0x000000000466b1ac clang::CodeGen::CodeGenFunction::EmitLValueHelper(clang::Expr const*, clang::CodeGen::KnownNonNull_t) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x466b1ac)
#19 0x000000000466b777 void llvm::function_ref<void ()>::callback_fn<clang::CodeGen::CodeGenFunction::EmitLValue(clang::Expr const*, clang::CodeGen::KnownNonNull_t)::'lambda'()>(long) CGExpr.cpp:0:0
#20 0x00000000084fa911 clang::StackExhaustionHandler::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x84fa911)
#21 0x0000000004636573 clang::CodeGen::CodeGenFunction::EmitLValue(clang::Expr const*, clang::CodeGen::KnownNonNull_t) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4636573)
#22 0x0000000004653dbf clang::CodeGen::CodeGenFunction::EmitArrayToPointerDecay(clang::Expr const*, clang::CodeGen::LValueBaseInfo*, clang::CodeGen::TBAAAccessInfo*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4653dbf)
#23 0x00000000046d7074 (anonymous namespace)::ScalarExprEmitter::VisitCastExpr(clang::CastExpr*) CGExprScalar.cpp:0:0
#24 0x00000000046cd916 clang::StmtVisitorBase<std::add_pointer, (anonymous namespace)::ScalarExprEmitter, llvm::Value*>::Visit(clang::Stmt*) CGExprScalar.cpp:0:0
#25 0x00000000046de36a (anonymous namespace)::ScalarExprEmitter::VisitExprWithCleanups(clang::ExprWithCleanups*) CGExprScalar.cpp:0:0
#26 0x00000000046ce085 clang::StmtVisitorBase<std::add_pointer, (anonymous namespace)::ScalarExprEmitter, llvm::Value*>::Visit(clang::Stmt*) CGExprScalar.cpp:0:0
#27 0x00000000046d2f1c clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x46d2f1c)
#28 0x0000000004b9ddd9 clang::CodeGen::CodeGenFunction::EmitScalarInit(clang::Expr const*, clang::ValueDecl const*, clang::CodeGen::LValue, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b9ddd9)
#29 0x0000000004b9fc87 clang::CodeGen::CodeGenFunction::EmitExprAsInit(clang::Expr const*, clang::ValueDecl const*, clang::CodeGen::LValue, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b9fc87)
#30 0x0000000004bae127 clang::CodeGen::CodeGenFunction::EmitAutoVarInit(clang::CodeGen::CodeGenFunction::AutoVarEmission const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4bae127)
#31 0x0000000004bae7c6 clang::CodeGen::CodeGenFunction::EmitVarDecl(clang::VarDecl const&) (.part.0) CGDecl.cpp:0:0
#32 0x0000000004baee97 clang::CodeGen::CodeGenFunction::EmitDecl(clang::Decl const&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4baee97)
#33 0x00000000047eb5ec clang::CodeGen::CodeGenFunction::EmitDeclStmt(clang::DeclStmt const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47eb5ec)
#34 0x000000000480245d clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x480245d)
#35 0x00000000047f99c1 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47f99c1)
#36 0x0000000004801fbb clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4801fbb)
#37 0x0000000004802558 clang::CodeGen::CodeGenFunction::EmitSimpleStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4802558)
#38 0x00000000047f99c1 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47f99c1)
#39 0x00000000047fe762 clang::CodeGen::CodeGenFunction::EmitForStmt(clang::ForStmt const&, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47fe762)
#40 0x00000000047f9c5d clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47f9c5d)
#41 0x0000000004801fbb clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4801fbb)
#42 0x0000000004869ffe clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4869ffe)
#43 0x000000000487b454 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x487b454)
#44 0x00000000048e9340 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48e9340)
#45 0x00000000048e3fe4 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48e3fe4)
#46 0x00000000048e47c3 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48e47c3)
#47 0x00000000048efd53 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#48 0x0000000004c53569 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#49 0x0000000004c44094 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c44094)
#50 0x0000000006a0c304 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6a0c304)
#51 0x0000000004c50978 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c50978)
#52 0x0000000004f46ff5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f46ff5)
#53 0x0000000004ec728e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4ec728e)
#54 0x000000000504137d clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x504137d)
#55 0x0000000000de5c4c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde5c4c)
#56 0x0000000000ddc69a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#57 0x0000000000ddc81d int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#58 0x0000000004cc3049 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
#59 0x0000000004231cb4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4231cb4)
#60 0x0000000004cc365f 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
#61 0x0000000004c84142 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c84142)
#62 0x0000000004c850ee 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+++0x4c850ee)
#63 0x0000000004c8c545 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c8c545)
#64 0x0000000000de2041 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xde2041)
#65 0x0000000000c8d094 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc8d094)
#66 0x0000787a79629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#67 0x0000787a79629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#68 0x0000000000ddc135 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xddc135)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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