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resurrected LLVM "C Backend", with improvements
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llvm-cbe crashes at .ll ouput from clang++-10 (plzip-1.9 lzip_index.c) #133

Open makise-homura opened 3 years ago

makise-homura commented 3 years ago

Say, we have LLVM 10.0.0, and just have built llvm-cbe in current directory.

Trying to build lzip_index.cc from plzip-1.9 with lzlib-1.12:

wget -q http://download.savannah.gnu.org/releases/lzip/lzlib/lzlib-1.12.tar.gz
wget -q http://download.savannah.gnu.org/releases/lzip/plzip/plzip-1.9.tar.gz
tar xf plzip-1.9.tar.gz
tar xf lzlib-1.12.tar.gz
clang++-10 -S -emit-llvm -g -Iplzip-1.9 -Ilzlib-1.12 -o lzip_index.ll plzip-1.9/lzip_index.cc
./llvm-cbe lzip_index.ll

And it crashes with SIGSEGV with the following stack trace:

#0 0x00007f369d0a44ff llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/usr/lib/llvm-10/lib/libLLVM-10.so.1+0x9814ff)
#1 0x00007f369d0a2782 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-10/lib/libLLVM-10.so.1+0x97f782)
#2 0x00007f369d0a4ac5 (/usr/lib/llvm-10/lib/libLLVM-10.so.1+0x981ac5)
#3 0x00007f369c34a210 (/lib/x86_64-linux-gnu/libc.so.6+0x46210)
#4 0x00007f369d1355fc llvm::DataLayout::getAlignmentInfo(llvm::AlignTypeEnum, unsigned int, bool, llvm::Type*) const (/usr/lib/llvm-10/lib/libLLVM-10.so.1+0xa125fc)
#5 0x00005558f07d71b0
Stack dump:
0.      Program arguments: ./llvm-cbe lzip_index.ll

The same is on LLVM 11.0.0 and 9.0.0 (but no stack trace somehow). Interestingly, on LLVM 8.0.0, there is no failure, .cbe.c output is being produced correctly, but issue #132 occurs then.

makise-homura commented 3 years ago

Simple reproduction example (lzip_index.cc):

class Lzip_index
{
  const long long insize;
public:
  Lzip_index();
};
Lzip_index::Lzip_index() : insize(0) {;}

Build: clang++-10 -S -emit-llvm -g -o lzip_index.ll lzip_index.cc && ./llvm-cbe lzip_index.ll

YenForYang commented 3 years ago

I seem to be getting a similar error with archive.cpp from UnRAR source (https://www.rarlab.com/rar/unrarsrc-6.0.6.tar.gz).

/usr/lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamE+0x1f)[0x7f35a5700c8f]
/usr/lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZN4llvm3sys17RunSignalHandlersEv+0x22)[0x7f35a56fef22]
/usr/lib/x86_64-linux-gnu/libLLVM-10.so.1(+0xb21255)[0x7f35a5701255]
/lib/x86_64-linux-gnu/libc.so.6(+0x3bd60)[0x7f35a470bd60]
/usr/lib/x86_64-linux-gnu/libLLVM-10.so.1(_ZNK4llvm10DataLayout16getAlignmentInfoENS_13AlignTypeEnumEjbPNS_4TypeE+0x4c)[0x7f35a579289c]
[0xe94600]
Stack dump:
0.      Program arguments: ./llvm-cbe --cbe-declare-locals-late archive.ll
[1]    23956 segmentation fault (core dumped)  ./llvm-cbe --cbe-declare-locals-late

I ran llvm-cbe archive.ll through valgrind's memcheck as well, 

 Invalid read of size 4
    at 0x541389C: operator() (llvm/lib/IR/DataLayout.cpp:481)
    by 0x541389C: partition_point<llvm::LayoutAlignElem *, (lambda at /build/llvm-toolchain-10-10.0.1~++20210313014605+ef32c611aa21/llvm/lib/IR/DataLayout.cpp:480:38)> (stl_algo.h:626)
    by 0x541389C: partition_point<llvm::SmallVector<llvm::LayoutAlignElem, 16> &, (lambda at /build/llvm-toolchain-10-10.0.1~++20210313014605+ef32c611aa21/llvm/lib/IR/DataLayout.cpp:480:38), llvm::LayoutAlignElem &> (llvm/include/llvm/ADT/STLExtras.h:1320)
    by 0x541389C: findAlignmentLowerBound (llvm/lib/IR/DataLayout.cpp:480)
    by 0x541389C: findAlignmentLowerBound (llvm/include/llvm/IR/DataLayout.h:149)
    by 0x541389C: llvm::DataLayout::getAlignmentInfo(llvm::AlignTypeEnum, unsigned int, bool, llvm::Type*) const (llvm/lib/IR/DataLayout.cpp:542)
    by 0x9A9B59F: ???
    by 0x44ABF7: llvm_cbe::CWriter::doFinalization(llvm::Module&) (lib/Target/CBackend/CBackend.cpp:2322)
    by 0x5488100: llvm::FPPassManager::doFinalization(llvm::Module&) (llvm/lib/IR/LegacyPassManager.cpp:1535)
    by 0x54885C1: runOnModule (llvm/lib/IR/LegacyPassManager.cpp:1611)
    by 0x54885C1: llvm::legacy::PassManagerImpl::run(llvm::Module&) (llvm/lib/IR/LegacyPassManager.cpp:1694)
    by 0x416744: compileModule(char**, llvm::LLVMContext&) (tools/llvm-cbe/llvm-cbe.cpp:427)
    by 0x415524: main (tools/llvm-cbe/llvm-cbe.cpp:242)
  Address 0xfdc8e647f4ed9308 is not stack'd, malloc'd or (recently) free'd

 Process terminating with default action of signal 11 (SIGSEGV)
  General Protection Fault
    at 0x541389C: operator() (llvm/lib/IR/DataLayout.cpp:481)
    by 0x541389C: partition_point<llvm::LayoutAlignElem *, (lambda at /build/llvm-toolchain-10-10.0.1~++20210313014605+ef32c611aa21/llvm/lib/IR/DataLayout.cpp:480:38)> (stl_algo.h:626)
    by 0x541389C: partition_point<llvm::SmallVector<llvm::LayoutAlignElem, 16> &, (lambda at /build/llvm-toolchain-10-10.0.1~++20210313014605+ef32c611aa21/llvm/lib/IR/DataLayout.cpp:480:38), llvm::LayoutAlignElem &> (llvm/include/llvm/ADT/STLExtras.h:1320)
    by 0x541389C: findAlignmentLowerBound (llvm/lib/IR/DataLayout.cpp:480)
    by 0x541389C: findAlignmentLowerBound (llvm/include/llvm/IR/DataLayout.h:149)
    by 0x541389C: llvm::DataLayout::getAlignmentInfo(llvm::AlignTypeEnum, unsigned int, bool, llvm::Type*) const (llvm/lib/IR/DataLayout.cpp:542)
    by 0x9A9B59F: ???
    by 0x44ABF7: llvm_cbe::CWriter::doFinalization(llvm::Module&) (lib/Target/CBackend/CBackend.cpp:2322)
    by 0x5488100: llvm::FPPassManager::doFinalization(llvm::Module&) (llvm/lib/IR/LegacyPassManager.cpp:1535)
    by 0x54885C1: runOnModule (llvm/lib/IR/LegacyPassManager.cpp:1611)
    by 0x54885C1: llvm::legacy::PassManagerImpl::run(llvm::Module&) (llvm/lib/IR/LegacyPassManager.cpp:1694)
    by 0x416744: compileModule(char**, llvm::LLVMContext&) (tools/llvm-cbe/llvm-cbe.cpp:427)
    by 0x415524: main (tools/llvm-cbe/llvm-cbe.cpp:242)