[PATCH] D105519: [WebAssembly] Deduplicate imports of the same module name, field name, and type

[Nick Fitzgerald via Phabricator via llvm-commits]

fitzgen added a comment.

Is there documentation anywhere on how to build `wasm-ld` with memory sanitizer enabled?

I've tried this:

  $ cmake -DLLVM_USE_SANITIZER=MemoryWithOrigins -DLLVM_ENABLE_PROJECTS=lld path/to/llvm
  $ make -j8

but then I get memory sanitizer errors while running `make` like this:

  [  5%] Building Attributes.inc...
  Uninitialized bytes in __interceptor_memchr at offset 6 inside [0x7020000006c0, 7)
  ==1094381==WARNING: MemorySanitizer: use-of-uninitialized-value
      #0 0x52842d in llvm::StringRef::find(char, unsigned long) const /home/nick/llvm-project/llvm/include/llvm/ADT/StringRef.h:319:29
      #1 0x11b0ccf in llvm::StringRef::split(llvm::SmallVectorImpl<llvm::StringRef>&, char, int, bool) const /home/nick/llvm-project/llvm/lib/Support/StringRef.cpp:341:20
      #2 0x11da056 in llvm::Triple::Triple(llvm::Twine const&) /home/nick/llvm-project/llvm/lib/Support/Triple.cpp:770:19
      #3 0x12f4e33 in llvm::sys::getProcessTriple[abi:cxx11]() /home/nick/llvm-project/llvm/lib/Support/Host.cpp:1727:10
      #4 0x10b1bd5 in (anonymous namespace)::CommandLineParser::ParseCommandLineOptions(int, char const* const*, llvm::StringRef, llvm::raw_ostream*, bool) /home/nick/llvm-project/llvm/lib/Support/CommandLine.cpp:1345:17
      #5 0x10b1570 in llvm::cl::ParseCommandLineOptions(int, char const* const*, llvm::StringRef, llvm::raw_ostream*, char const*, bool) /home/nick/llvm-project/llvm/lib/Support/CommandLine.cpp:1320:24
      #6 0xff18e5 in main /home/nick/llvm-project/llvm/utils/TableGen/TableGen.cpp:283:3
      #7 0x7f773ee7acb1 in __libc_start_main csu/../csu/libc-start.c:314:16
      #8 0x428a1d in _start (/home/nick/llvm-project/obj/bin/llvm-tblgen+0x428a1d)
  
    Uninitialized value was stored to memory at
      #0 0x42e7c9 in __msan_memcpy (/home/nick/llvm-project/obj/bin/llvm-tblgen+0x42e7c9)
      #1 0x527135 in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char*>(char*, char*, std::forward_iterator_tag) /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/bits/basic_string.tcc:225:6
      #2 0x11f977f in llvm::Twine::str[abi:cxx11]() const /home/nick/llvm-project/llvm/lib/Support/Twine.cpp:20:12
      #3 0x11d9f3d in llvm::Triple::Triple(llvm::Twine const&) /home/nick/llvm-project/llvm/lib/Support/Triple.cpp:765:16
      #4 0x12f4e33 in llvm::sys::getProcessTriple[abi:cxx11]() /home/nick/llvm-project/llvm/lib/Support/Host.cpp:1727:10
      #5 0x10b1bd5 in (anonymous namespace)::CommandLineParser::ParseCommandLineOptions(int, char const* const*, llvm::StringRef, llvm::raw_ostream*, bool) /home/nick/llvm-project/llvm/lib/Support/CommandLine.cpp:1345:17
      #6 0x10b1570 in llvm::cl::ParseCommandLineOptions(int, char const* const*, llvm::StringRef, llvm::raw_ostream*, char const*, bool) /home/nick/llvm-project/llvm/lib/Support/CommandLine.cpp:1320:24
      #7 0xff18e5 in main /home/nick/llvm-project/llvm/utils/TableGen/TableGen.cpp:283:3
      #8 0x7f773ee7acb1 in __libc_start_main csu/../csu/libc-start.c:314:16
  
    Uninitialized value was created by a heap allocation
      #0 0x4a30a9 in operator new(unsigned long) (/home/nick/llvm-project/obj/bin/llvm-tblgen+0x4a30a9)
      #1 0x7f773f19c87f in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::reserve(unsigned long) (/lib/x86_64-linux-gnu/libstdc++.so.6+0x14387f)
      #2 0xffffffffffffef9f  (<unknown module>)
  
  SUMMARY: MemorySanitizer: use-of-uninitialized-value /home/nick/llvm-project/llvm/include/llvm/ADT/StringRef.h:319:29 in llvm::StringRef::find(char, unsigned long) const
  Exiting
  make[2]: *** [include/llvm/IR/CMakeFiles/intrinsics_gen.dir/build.make:136: include/llvm/IR/Attributes.inc] Error 77
  make[2]: Leaving directory '/home/nick/llvm-project/obj'
  make[1]: *** [CMakeFiles/Makefile2:11564: include/llvm/IR/CMakeFiles/intrinsics_gen.dir/all] Error 2
  make[1]: Leaving directory '/home/nick/llvm-project/obj'
  make: *** [Makefile:152: all] Error 2


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