/// A definition of a register may mark the end of a range.
void LiveDebugValues::transferRegisterDef(MachineInstr &MI,
                                          OpenRangesSet &OpenRanges,
                                          const VarLocMap &VarLocIDs) {
  MachineFunction *MF = MI.getParent()->getParent();
  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
  unsigned SP = TLI->getStackPointerRegisterToSaveRestore();
  SparseBitVector<> KillSet;
  for (const MachineOperand &MO : MI.operands()) {
    if (MO.isReg() && MO.isDef() && MO.getReg() &&
        TRI->isPhysicalRegister(MO.getReg())) {
      // Remove ranges of all aliased registers.
      for (MCRegAliasIterator RAI(MO.getReg(), TRI, true); RAI.isValid(); ++RAI)
        for (unsigned ID : OpenRanges.getVarLocs())
          if (VarLocIDs[ID].isDescribedByReg() == *RAI)
            KillSet.set(ID);
    } else if (MO.isRegMask()) {
      // Remove ranges of all clobbered registers. Register masks don't usually
      // list SP as preserved.  While the debug info may be off for an
      // instruction or two around callee-cleanup calls, transferring the
      // DEBUG_VALUE across the call is still a better user experience.
      for (unsigned ID : OpenRanges.getVarLocs()) {
        unsigned Reg = VarLocIDs[ID].isDescribedByReg();
        if (Reg && Reg != SP && MO.clobbersPhysReg(Reg))
          KillSet.set(ID);
      }
    }
  }
  OpenRanges.erase(KillSet, VarLocIDs);
}
void LazyLiveness::computeBackedgeChain(MachineFunction& mf, 
                                        MachineBasicBlock* MBB) {
  SparseBitVector<128> tmp = rv[MBB];
  tmp.set(preorder[MBB]);
  tmp &= backedge_source;
  calculated.set(preorder[MBB]);
  
  for (SparseBitVector<128>::iterator I = tmp.begin(); I != tmp.end(); ++I) {
    assert(rev_preorder.size() > *I && "Unknown block!");
    
    MachineBasicBlock* SrcMBB = rev_preorder[*I];
    
    for (MachineBasicBlock::succ_iterator SI = SrcMBB->succ_begin(),
         SE = SrcMBB->succ_end(); SI != SE; ++SI) {
      MachineBasicBlock* TgtMBB = *SI;
      
      if (backedges.count(std::make_pair(SrcMBB, TgtMBB)) &&
          !rv[MBB].test(preorder[TgtMBB])) {
        if (!calculated.test(preorder[TgtMBB]))
          computeBackedgeChain(mf, TgtMBB);
        
        tv[MBB].set(preorder[TgtMBB]);
        SparseBitVector<128> right = tv[TgtMBB];
        tv[MBB] |= right;
      }
    }
    
    tv[MBB].reset(preorder[MBB]);
  }
}
Exemple #3
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void SIFixWWMLiveness::addDefs(const MachineInstr &MI, SparseBitVector<> &Regs)
{
  for (const MachineOperand &Op : MI.defs()) {
    if (Op.isReg()) {
      unsigned Reg = Op.getReg();
      if (TRI->isVGPR(*MRI, Reg))
        Regs.set(Reg);
    }
  }
}
Exemple #4
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Error llvm::pdb::readSparseBitVector(BinaryStreamReader &Stream,
                                     SparseBitVector<> &V) {
  uint32_t NumWords;
  if (auto EC = Stream.readInteger(NumWords))
    return joinErrors(
        std::move(EC),
        make_error<RawError>(raw_error_code::corrupt_file,
                             "Expected hash table number of words"));

  for (uint32_t I = 0; I != NumWords; ++I) {
    uint32_t Word;
    if (auto EC = Stream.readInteger(Word))
      return joinErrors(std::move(EC),
                        make_error<RawError>(raw_error_code::corrupt_file,
                                             "Expected hash table word"));
    for (unsigned Idx = 0; Idx < 32; ++Idx)
      if (Word & (1U << Idx))
        V.set((I * 32) + Idx);
  }
  return Error::success();
}
Exemple #5
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Error NameMap::load(StreamReader &Stream) {
  // This is some sort of weird string-set/hash table encoded in the stream.
  // It starts with the number of bytes in the table.
  uint32_t NumberOfBytes;
  if (auto EC = Stream.readInteger(NumberOfBytes))
    return joinErrors(std::move(EC),
                      make_error<RawError>(raw_error_code::corrupt_file,
                                           "Expected name map length"));
  if (Stream.bytesRemaining() < NumberOfBytes)
    return make_error<RawError>(raw_error_code::corrupt_file,
                                "Invalid name map length");

  // Following that field is the starting offset of strings in the name table.
  uint32_t StringsOffset = Stream.getOffset();
  Stream.setOffset(StringsOffset + NumberOfBytes);

  // This appears to be equivalent to the total number of strings *actually*
  // in the name table.
  uint32_t HashSize;
  if (auto EC = Stream.readInteger(HashSize))
    return joinErrors(std::move(EC),
                      make_error<RawError>(raw_error_code::corrupt_file,
                                           "Expected name map hash size"));

  // This appears to be an upper bound on the number of strings in the name
  // table.
  uint32_t MaxNumberOfStrings;
  if (auto EC = Stream.readInteger(MaxNumberOfStrings))
    return joinErrors(std::move(EC),
                      make_error<RawError>(raw_error_code::corrupt_file,
                                           "Expected name map max strings"));

  if (MaxNumberOfStrings > (UINT32_MAX / sizeof(uint32_t)))
    return make_error<RawError>(raw_error_code::corrupt_file,
                                "Implausible number of strings");

  const uint32_t MaxNumberOfWords = UINT32_MAX / (sizeof(uint32_t) * 8);

  // This appears to be a hash table which uses bitfields to determine whether
  // or not a bucket is 'present'.
  uint32_t NumPresentWords;
  if (auto EC = Stream.readInteger(NumPresentWords))
    return joinErrors(std::move(EC),
                      make_error<RawError>(raw_error_code::corrupt_file,
                                           "Expected name map num words"));

  if (NumPresentWords > MaxNumberOfWords)
    return make_error<RawError>(raw_error_code::corrupt_file,
                                "Number of present words is too large");

  SparseBitVector<> Present;
  for (uint32_t I = 0; I != NumPresentWords; ++I) {
    uint32_t Word;
    if (auto EC = Stream.readInteger(Word))
      return joinErrors(std::move(EC),
                        make_error<RawError>(raw_error_code::corrupt_file,
                                             "Expected name map word"));
    for (unsigned Idx = 0; Idx < 32; ++Idx)
      if (Word & (1U << Idx))
        Present.set((I * 32) + Idx);
  }

  // This appears to be a hash table which uses bitfields to determine whether
  // or not a bucket is 'deleted'.
  uint32_t NumDeletedWords;
  if (auto EC = Stream.readInteger(NumDeletedWords))
    return joinErrors(
        std::move(EC),
        make_error<RawError>(raw_error_code::corrupt_file,
                             "Expected name map num deleted words"));

  if (NumDeletedWords > MaxNumberOfWords)
    return make_error<RawError>(raw_error_code::corrupt_file,
                                "Number of deleted words is too large");

  SparseBitVector<> Deleted;
  for (uint32_t I = 0; I != NumDeletedWords; ++I) {
    uint32_t Word;
    if (auto EC = Stream.readInteger(Word))
      return joinErrors(std::move(EC),
                        make_error<RawError>(raw_error_code::corrupt_file,
                                             "Expected name map word"));
    for (unsigned Idx = 0; Idx < 32; ++Idx)
      if (Word & (1U << Idx))
        Deleted.set((I * 32) + Idx);
  }

  for (unsigned I : Present) {
    // For all present entries, dump out their mapping.
    (void)I;

    // This appears to be an offset relative to the start of the strings.
    // It tells us where the null-terminated string begins.
    uint32_t NameOffset;
    if (auto EC = Stream.readInteger(NameOffset))
      return joinErrors(std::move(EC),
                        make_error<RawError>(raw_error_code::corrupt_file,
                                             "Expected name map name offset"));

    // This appears to be a stream number into the stream directory.
    uint32_t NameIndex;
    if (auto EC = Stream.readInteger(NameIndex))
      return joinErrors(std::move(EC),
                        make_error<RawError>(raw_error_code::corrupt_file,
                                             "Expected name map name index"));

    // Compute the offset of the start of the string relative to the stream.
    uint32_t StringOffset = StringsOffset + NameOffset;
    uint32_t OldOffset = Stream.getOffset();
    // Pump out our c-string from the stream.
    StringRef Str;
    Stream.setOffset(StringOffset);
    if (auto EC = Stream.readZeroString(Str))
      return joinErrors(std::move(EC),
                        make_error<RawError>(raw_error_code::corrupt_file,
                                             "Expected name map name"));

    Stream.setOffset(OldOffset);
    // Add this to a string-map from name to stream number.
    Mapping.insert({Str, NameIndex});
  }

  return Error::success();
}