Esempio n. 1
0
/// Does this instruction write some memory?  This only returns true for things
/// that we can analyze with other helpers below.
static bool hasMemoryWrite(Instruction *I, const TargetLibraryInfo &TLI) {
  if (isa<StoreInst>(I))
    return true;
  if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(I)) {
    switch (II->getIntrinsicID()) {
    default:
      return false;
    case Intrinsic::memset:
    case Intrinsic::memmove:
    case Intrinsic::memcpy:
    case Intrinsic::init_trampoline:
    case Intrinsic::lifetime_end:
      return true;
    }
  }
  if (auto CS = CallSite(I)) {
    if (Function *F = CS.getCalledFunction()) {
      StringRef FnName = F->getName();
      if (TLI.has(LibFunc::strcpy) && FnName == TLI.getName(LibFunc::strcpy))
        return true;
      if (TLI.has(LibFunc::strncpy) && FnName == TLI.getName(LibFunc::strncpy))
        return true;
      if (TLI.has(LibFunc::strcat) && FnName == TLI.getName(LibFunc::strcat))
        return true;
      if (TLI.has(LibFunc::strncat) && FnName == TLI.getName(LibFunc::strncat))
        return true;
    }
  }
  return false;
}
Esempio n. 2
0
// Collect names of runtime library functions. User-defined functions with the
// same names are added to llvm.compiler.used to prevent them from being
// deleted by optimizations.
static void accumulateAndSortLibcalls(std::vector<StringRef> &Libcalls,
                                      const TargetLibraryInfo& TLI,
                                      const Module &Mod,
                                      const TargetMachine &TM) {
  // TargetLibraryInfo has info on C runtime library calls on the current
  // target.
  for (unsigned I = 0, E = static_cast<unsigned>(LibFunc::NumLibFuncs);
       I != E; ++I) {
    LibFunc::Func F = static_cast<LibFunc::Func>(I);
    if (TLI.has(F))
      Libcalls.push_back(TLI.getName(F));
  }

  SmallPtrSet<const TargetLowering *, 1> TLSet;

  for (const Function &F : Mod) {
    const TargetLowering *Lowering =
        TM.getSubtargetImpl(F)->getTargetLowering();

    if (Lowering && TLSet.insert(Lowering).second)
      // TargetLowering has info on library calls that CodeGen expects to be
      // available, both from the C runtime and compiler-rt.
      for (unsigned I = 0, E = static_cast<unsigned>(RTLIB::UNKNOWN_LIBCALL);
           I != E; ++I)
        if (const char *Name =
                Lowering->getLibcallName(static_cast<RTLIB::Libcall>(I)))
          Libcalls.push_back(Name);
  }

  array_pod_sort(Libcalls.begin(), Libcalls.end());
  Libcalls.erase(std::unique(Libcalls.begin(), Libcalls.end()),
                 Libcalls.end());
}
Esempio n. 3
0
static void accumulateAndSortLibcalls(std::vector<StringRef> &Libcalls,
                                      const TargetLibraryInfo& TLI,
                                      const TargetLowering *Lowering)
{
  // TargetLibraryInfo has info on C runtime library calls on the current
  // target.
  for (unsigned I = 0, E = static_cast<unsigned>(LibFunc::NumLibFuncs);
       I != E; ++I) {
    LibFunc::Func F = static_cast<LibFunc::Func>(I);
    if (TLI.has(F))
      Libcalls.push_back(TLI.getName(F));
  }

  // TargetLowering has info on library calls that CodeGen expects to be
  // available, both from the C runtime and compiler-rt.
  if (Lowering)
    for (unsigned I = 0, E = static_cast<unsigned>(RTLIB::UNKNOWN_LIBCALL);
         I != E; ++I)
      if (const char *Name
          = Lowering->getLibcallName(static_cast<RTLIB::Libcall>(I)))
        Libcalls.push_back(Name);

  array_pod_sort(Libcalls.begin(), Libcalls.end());
  Libcalls.erase(std::unique(Libcalls.begin(), Libcalls.end()),
                 Libcalls.end());
}
static void createLibraryFunction(llvm::LibFunc::Func funcId,
        llvm::FunctionType *funcType, Module* module)
{
    TargetLibraryInfo targetLib;

    if (targetLib.has(funcId))
    {
        Function::Create(funcType, Function::ExternalLinkage,
                targetLib.getName(funcId), module);
    }
    else
    {
        string msg = "native target does not have library function for ";
        msg += targetLib.getName(funcId);
        throw_llvm_exception(msg);
    }
}