[PATCH] D81631: Fix undefined behavior in Dwarf.

[zuojian lin via Phabricator via llvm-commits]

linzj added a comment.

Then the memory sanitizer finds another bug when compiling:

2397==WARNING: MemorySanitizer: use-of-uninitialized-value
----------------------------------------------------------

  #0 0xb210e7 in llvm::StringRef::find(char, unsigned long) const /home/linzj/ssdsrc/llvm-project2/llvm/building-release/../include/llvm/ADT/StringRef.h:322:29
  #1 0xb210e7 in llvm::StringRef::split(llvm::SmallVectorImpl<llvm::StringRef>&, char, int, bool) const /home/linzj/ssdsrc/llvm-project2/llvm/building-release/../lib/Support/StringRef.cpp:344:20
  #2 0xb2b6d4 in llvm::Triple::Triple(llvm::Twine const&) /home/linzj/ssdsrc/llvm-project2/llvm/building-release/../lib/Support/Triple.cpp:739:19
  #3 0xb63b3c in llvm::sys::getProcessTriple[abi:cxx11]() /home/linzj/ssdsrc/llvm-project2/llvm/building-release/../lib/Support/Host.cpp:1615:10
  #4 0xadecab in (anonymous namespace)::CommandLineParser::ParseCommandLineOptions(int, char const* const*, llvm::StringRef, llvm::raw_ostream*, bool) /home/linzj/ssdsrc/llvm-project2/llvm/building-release/../lib/Support/CommandLine.cpp:1347:17
  #5 0xadecab in llvm::cl::ParseCommandLineOptions(int, char const* const*, llvm::StringRef, llvm::raw_ostream*, char const*, bool) /home/linzj/ssdsrc/llvm-project2/llvm/building-release/../lib/Support/CommandLine.cpp:1322:24
  #6 0xa90283 in main /home/linzj/ssdsrc/llvm-project2/llvm/building-release/../utils/TableGen/TableGen.cpp:265:3
  #7 0x7fc23a9d4b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
  #8 0x426c69 in _start (/media/linzj/ff6fd1aa-94f2-4f61-9aba-67c6c99a0a59/home/linzj/src/llvm-project2/llvm/building-release/bin/llvm-tblgen+0x426c69)


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  https://reviews.llvm.org/D81631/new/

https://reviews.llvm.org/D81631