// Split stacks is a feature to support a discontiguous stack,
    // commonly used in the programming language Go. For the details,
    // see https://gcc.gnu.org/wiki/SplitStacks. An object file compiled
    // for split stack will include a .note.GNU-split-stack section.
    if (name == ".note.GNU-split-stack") {
      if (config->relocatable) {
        error(
            "cannot mix split-stack and non-split-stack in a relocatable link");
        return &InputSection::discarded;
      }
      this->splitStack = true;
      return &InputSection::discarded;
    }

template <class ELFT>
void InputSectionBase::relocate(uint8_t *buf, uint8_t *bufEnd) {
  if ((flags & SHF_EXECINSTR) && LLVM_UNLIKELY(getFile<ELFT>()->splitStack))
    adjustSplitStackFunctionPrologues<ELFT>(buf, bufEnd);
  //...
}

// If a function compiled for split stack calls a function not
// compiled for split stack, then the caller needs its prologue
// adjusted to ensure that the called function will have enough stack
// available. Find those functions, and adjust their prologues.
template <class ELFT>
void InputSectionBase::adjustSplitStackFunctionPrologues(uint8_t *buf,
                                                         uint8_t *end) {
  //...

  if (target->needsMoreStackNonSplit)
    switchMorestackCallsToMorestackNonSplit(prologues, morestackCalls);
}

// For each function-defining prologue, find any calls to __morestack,
// and replace them with calls to __morestack_non_split.
static void switchMorestackCallsToMorestackNonSplit(
  //...

  // If the target adjusted a function's prologue, all calls to
  // __morestack inside that function should be switched to
  // __morestack_non_split.
  Symbol *moreStackNonSplit = symtab->find("__morestack_non_split");
  if (!moreStackNonSplit) {
    error("mixing split-stack objects requires a definition of "
          "__morestack_non_split");
    return;
  }

  //...
}