C++ StackFrameSP::get方法代码示例

  void Materialize(lldb::StackFrameSP &frame_sp, IRMemoryMap &map,
                   lldb::addr_t process_address, Status &err) override {
    Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));

    const lldb::addr_t load_addr = process_address + m_offset;

    if (log) {
      log->Printf("EntityRegister::Materialize [address = 0x%" PRIx64
                  ", m_register_info = %s]",
                  (uint64_t)load_addr, m_register_info.name);
    }

    RegisterValue reg_value;

    if (!frame_sp.get()) {
      err.SetErrorStringWithFormat(
          "couldn't materialize register %s without a stack frame",
          m_register_info.name);
      return;
    }

    lldb::RegisterContextSP reg_context_sp = frame_sp->GetRegisterContext();

    if (!reg_context_sp->ReadRegister(&m_register_info, reg_value)) {
      err.SetErrorStringWithFormat("couldn't read the value of register %s",
                                   m_register_info.name);
      return;
    }

    DataExtractor register_data;

    if (!reg_value.GetData(register_data)) {
      err.SetErrorStringWithFormat("couldn't get the data for register %s",
                                   m_register_info.name);
      return;
    }

    if (register_data.GetByteSize() != m_register_info.byte_size) {
      err.SetErrorStringWithFormat(
          "data for register %s had size %llu but we expected %llu",
          m_register_info.name, (unsigned long long)register_data.GetByteSize(),
          (unsigned long long)m_register_info.byte_size);
      return;
    }

    m_register_contents.reset(new DataBufferHeap(register_data.GetDataStart(),
                                                 register_data.GetByteSize()));

    Status write_error;

    map.WriteMemory(load_addr, register_data.GetDataStart(),
                    register_data.GetByteSize(), write_error);

    if (!write_error.Success()) {
      err.SetErrorStringWithFormat(
          "couldn't write the contents of register %s: %s",
          m_register_info.name, write_error.AsCString());
      return;
    }
  }

  void Dematerialize(lldb::StackFrameSP &frame_sp, IRMemoryMap &map,
                     lldb::addr_t process_address, lldb::addr_t frame_top,
                     lldb::addr_t frame_bottom, Status &err) override {
    Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));

    const lldb::addr_t load_addr = process_address + m_offset;

    if (log) {
      log->Printf("EntityRegister::Dematerialize [address = 0x%" PRIx64
                  ", m_register_info = %s]",
                  (uint64_t)load_addr, m_register_info.name);
    }

    Status extract_error;

    DataExtractor register_data;

    if (!frame_sp.get()) {
      err.SetErrorStringWithFormat(
          "couldn't dematerialize register %s without a stack frame",
          m_register_info.name);
      return;
    }

    lldb::RegisterContextSP reg_context_sp = frame_sp->GetRegisterContext();

    map.GetMemoryData(register_data, load_addr, m_register_info.byte_size,
                      extract_error);

    if (!extract_error.Success()) {
      err.SetErrorStringWithFormat("couldn't get the data for register %s: %s",
                                   m_register_info.name,
                                   extract_error.AsCString());
      return;
    }

    if (!memcmp(register_data.GetDataStart(), m_register_contents->GetBytes(),
                register_data.GetByteSize())) {
      // No write required, and in particular we avoid errors if the register
      // wasn't writable

      m_register_contents.reset();
      return;
    }

    m_register_contents.reset();

    RegisterValue register_value(
        const_cast<uint8_t *>(register_data.GetDataStart()),
        register_data.GetByteSize(), register_data.GetByteOrder());

    if (!reg_context_sp->WriteRegister(&m_register_info, register_value)) {
      err.SetErrorStringWithFormat("couldn't write the value of register %s",
                                   m_register_info.name);
      return;
    }
  }

Materializer::DematerializerSP
Materializer::Materialize(lldb::StackFrameSP &frame_sp, IRMemoryMap &map,
                          lldb::addr_t process_address, Status &error) {
  ExecutionContextScope *exe_scope = frame_sp.get();

  if (!exe_scope)
    exe_scope = map.GetBestExecutionContextScope();

  DematerializerSP dematerializer_sp = m_dematerializer_wp.lock();

  if (dematerializer_sp) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't materialize: already materialized");
  }

  DematerializerSP ret(
      new Dematerializer(*this, frame_sp, map, process_address));

  if (!exe_scope) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't materialize: target doesn't exist");
  }

  for (EntityUP &entity_up : m_entities) {
    entity_up->Materialize(frame_sp, map, process_address, error);

    if (!error.Success())
      return DematerializerSP();
  }

  if (Log *log =
          lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)) {
    log->Printf(
        "Materializer::Materialize (frame_sp = %p, process_address = 0x%" PRIx64
        ") materialized:",
        static_cast<void *>(frame_sp.get()), process_address);
    for (EntityUP &entity_up : m_entities)
      entity_up->DumpToLog(map, process_address, log);
  }

  m_dematerializer_wp = ret;

  return ret;
}

Status ABISysV_ppc64::SetReturnValueObject(lldb::StackFrameSP &frame_sp,
                                           lldb::ValueObjectSP &new_value_sp) {
  Status error;
  if (!new_value_sp) {
    error.SetErrorString("Empty value object for return value.");
    return error;
  }

  CompilerType compiler_type = new_value_sp->GetCompilerType();
  if (!compiler_type) {
    error.SetErrorString("Null clang type for return value.");
    return error;
  }

  Thread *thread = frame_sp->GetThread().get();

  bool is_signed;
  uint32_t count;
  bool is_complex;

  RegisterContext *reg_ctx = thread->GetRegisterContext().get();

  bool set_it_simple = false;
  if (compiler_type.IsIntegerOrEnumerationType(is_signed) ||
      compiler_type.IsPointerType()) {
    const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName("r3", 0);

    DataExtractor data;
    Status data_error;
    size_t num_bytes = new_value_sp->GetData(data, data_error);
    if (data_error.Fail()) {
      error.SetErrorStringWithFormat(
          "Couldn't convert return value to raw data: %s",
          data_error.AsCString());
      return error;
    }
    lldb::offset_t offset = 0;
    if (num_bytes <= 8) {
      uint64_t raw_value = data.GetMaxU64(&offset, num_bytes);

      if (reg_ctx->WriteRegisterFromUnsigned(reg_info, raw_value))
        set_it_simple = true;
    } else {
      error.SetErrorString("We don't support returning longer than 64 bit "
                           "integer values at present.");
    }
  } else if (compiler_type.IsFloatingPointType(count, is_complex)) {
    if (is_complex)
      error.SetErrorString(
          "We don't support returning complex values at present");
    else {
      size_t bit_width = compiler_type.GetBitSize(frame_sp.get());
      if (bit_width <= 64) {
        DataExtractor data;
        Status data_error;
        size_t num_bytes = new_value_sp->GetData(data, data_error);
        if (data_error.Fail()) {
          error.SetErrorStringWithFormat(
              "Couldn't convert return value to raw data: %s",
              data_error.AsCString());
          return error;
        }

        unsigned char buffer[16];
        ByteOrder byte_order = data.GetByteOrder();

        data.CopyByteOrderedData(0, num_bytes, buffer, 16, byte_order);
        set_it_simple = true;
      } else {
        // FIXME - don't know how to do 80 bit long doubles yet.
        error.SetErrorString(
            "We don't support returning float values > 64 bits at present");
      }
    }
  }

  if (!set_it_simple) {
    // Okay we've got a structure or something that doesn't fit in a simple
    // register.
    // We should figure out where it really goes, but we don't support this yet.
    error.SetErrorString("We only support setting simple integer and float "
                         "return types at present.");
  }

  return error;
}