Compiler Segfault: Running pass 'X86 AT&T-Style Assembly Printer' on function "..."

[dymk]

Environment: OSX Mavericks, 10.9
LDC ~master, LLVM 3.2

This seems to only occur with the -g and -gc switches

payload_ldc_bug.d:

import variant_ldc_bug;

struct RequestAddImageFromPixels {
  int[] pixels;
}

void doSomething()
{
  RequestAddImageFromPixels payload;

  payload.visit!(
    (RequestAddImageFromPixels response)
    {
      foreach(px; response.pixels) {}
    }
  );
}

variant_ldc_bug.d

template visit(Handler ...)
{
  auto visit(VariantType)(VariantType variant)
  {
    visitImpl!(true, VariantType, Handler)(variant);
  }
}

auto visitImpl(bool Strict, VariantType, Handler...)(VariantType )
{
  foreach(dgidx; Handler) {}
}

and command: ldmd2 -gc payload_ldc_bug.d variant_ldc_bug.d

Will result in the following compiler crash:

Codeinator:clean_itr2.reduced dymk$ ldmd2 -gc payload_ldc_bug.d variant_ldc_bug.d
0  ldc2                     0x000000010ce32a05 PrintStackTrace(void*) + 37
1  ldc2                     0x000000010ce32e34 SignalHandler(int) + 452
2  libsystem_platform.dylib 0x00007fff8c0815aa _sigtramp + 26
3  libsystem_malloc.dylib   0x00007fff92330286 tiny_malloc_from_free_list + 1502
4  ldc2                     0x000000010c9aceaa llvm::DwarfDebug::updateSubprogramScopeDIE(llvm::CompileUnit*, llvm::MDNode const*) + 1578
5  ldc2                     0x000000010c9aecfc llvm::DwarfDebug::constructScopeDIE(llvm::CompileUnit*, llvm::LexicalScope*) + 1708
6  ldc2                     0x000000010c9b5a68 llvm::DwarfDebug::endFunction(llvm::MachineFunction const*) + 1352
7  ldc2                     0x000000010c993fb7 llvm::AsmPrinter::EmitFunctionBody() + 3799
8  ldc2                     0x000000010c7ca6b2 llvm::X86AsmPrinter::runOnMachineFunction(llvm::MachineFunction&) + 178
9  ldc2                     0x000000010ca28803 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 99
10 ldc2                     0x000000010cddf899 llvm::FPPassManager::runOnFunction(llvm::Function&) + 313
11 ldc2                     0x000000010cddf0a4 llvm::FunctionPassManagerImpl::run(llvm::Function&) + 196
12 ldc2                     0x000000010cddefa6 llvm::FunctionPassManager::run(llvm::Function&) + 86
13 ldc2                     0x000000010c5c27b7 codegenModule(llvm::TargetMachine&, llvm::Module&, llvm::raw_fd_ostream&, llvm::TargetMachine::CodeGenFileType) + 327
14 ldc2                     0x000000010c5c22ca writeModule(llvm::Module*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) + 3018
15 ldc2                     0x000000010c5c832c main + 9308
16 libdyld.dylib            0x00007fff8a48d5fd start + 1
Stack dump:
0.  Running pass 'X86 AT&T-Style Assembly Printer' on function '@_D15payload_ldc_bug11doSomethingFZv9__lambda1FNaNbNfS15payload_ldc_bug25RequestAddImageFromPixelsZv'
Error: Error executing /usr/local/bin/ldc2: Segmentation fault: 11

[redstar]

Thanks for the excellent report. I can reproduce the crash using Linux/x86_64, too.

[dnadlinger]

Seems to be fixed in LDC master and/or LLVM 3.5 (tested with a debug build, and still no assertion is hit):

LDC - the LLVM D compiler (bff766):
  based on DMD v2.066 and LLVM 3.5.0svn
  Default target: x86_64-unknown-linux-gnu
  Host CPU: corei7-avx