Global Metrics

Spaces Data

Minimal test - lines (24, 63)

Code

void read_procmaps(lul::LUL* aLUL) {
  MOZ_ASSERT(aLUL->CountMappings() == 0);

#if defined(GP_OS_linux) || defined(GP_OS_android) || defined(GP_OS_freebsd)
  SharedLibraryInfo info = SharedLibraryInfo::GetInfoForSelf();

  for (size_t i = 0; i < info.GetSize(); i++) {
    const SharedLibrary& lib = info.GetEntry(i);

    std::string nativePath = lib.GetNativeDebugPath();

    // We can use the standard POSIX-based mapper.
    AutoObjectMapperPOSIX mapper(aLUL->mLog);

    // Ask |mapper| to map the object.  Then hand its mapped address
    // to NotifyAfterMap().
    void* image = nullptr;
    size_t size = 0;
    bool ok = mapper.Map(&image, &size, nativePath);
    if (ok && image && size > 0) {
      aLUL->NotifyAfterMap(lib.GetStart(), lib.GetEnd() - lib.GetStart(),
                           nativePath.c_str(), image);
    } else if (!ok && lib.GetDebugName().IsEmpty()) {
      // The object has no name and (as a consequence) the mapper failed to map
      // it.  This happens on Linux, where GetInfoForSelf() produces such a
      // mapping for the VDSO.  This is a problem on x86-{linux,android} because
      // lack of knowledge about the mapped area inhibits LUL's special
      // __kernel_syscall handling.  Hence notify |aLUL| at least of the
      // mapping, even though it can't read any unwind information for the area.
      aLUL->NotifyExecutableArea(lib.GetStart(), lib.GetEnd() - lib.GetStart());
    }

    // |mapper| goes out of scope at this point and so its destructor
    // unmaps the object.
  }

#else
#  error "Unknown platform"
#endif
}