C++ Error::Clear方法代码示例

std::unique_ptr<Acceptor>
Acceptor::Create(StringRef name, const bool child_processes_inherit, Error &error)
{
    error.Clear();

    LocalSocketIdFunc local_socket_id;
    std::unique_ptr<Socket> listener_socket = nullptr;
    std::string host_str;
    std::string port_str;
    int32_t port = INT32_MIN;
    if (Socket::DecodeHostAndPort (name, host_str, port_str, port, &error))
    {
        auto tcp_socket = new TCPSocket(child_processes_inherit, error);
        local_socket_id = [tcp_socket]() {
            auto local_port = tcp_socket->GetLocalPortNumber();
            return (local_port != 0) ? std::to_string(local_port) : "";
        };
        listener_socket.reset(tcp_socket);
    }
    else
    {
        const std::string socket_name = name;
        local_socket_id = [socket_name](){
            return socket_name;
        };
        listener_socket.reset(new DomainSocket(child_processes_inherit, error));
    }

    if (error.Success())
        return std::unique_ptr<Acceptor>(
            new Acceptor(std::move(listener_socket), name, local_socket_id));

    return std::unique_ptr<Acceptor>();
}

bool
lldb_private::formatters::NSDictionaryMSyntheticFrontEnd::Update()
{
    m_children.clear();
    ValueObjectSP valobj_sp = m_backend.GetSP();
    m_ptr_size = 0;
    delete m_data_32;
    m_data_32 = NULL;
    delete m_data_64;
    m_data_64 = NULL;
    if (!valobj_sp)
        return false;
    m_exe_ctx_ref = valobj_sp->GetExecutionContextRef();
    Error error;
    error.Clear();
    lldb::ProcessSP process_sp(valobj_sp->GetProcessSP());
    if (!process_sp)
        return false;
    m_ptr_size = process_sp->GetAddressByteSize();
    m_order = process_sp->GetByteOrder();
    uint64_t data_location = valobj_sp->GetValueAsUnsigned(0) + m_ptr_size;
    if (m_ptr_size == 4)
    {
        m_data_32 = new DataDescriptor_32();
        process_sp->ReadMemory (data_location, m_data_32, sizeof(DataDescriptor_32), error);
    }
    else
    {
        m_data_64 = new DataDescriptor_64();
        process_sp->ReadMemory (data_location, m_data_64, sizeof(DataDescriptor_64), error);
    }
    if (error.Fail())
        return false;
    return false;
}

void
IRMemoryMap::WriteScalarToMemory (lldb::addr_t process_address, Scalar &scalar, size_t size, Error &error)
{
    error.Clear();
    
    if (size == UINT32_MAX)
        size = scalar.GetByteSize();
    
    if (size > 0)
    {
        uint8_t buf[32];
        const size_t mem_size = scalar.GetAsMemoryData (buf, size, GetByteOrder(), error);
        if (mem_size > 0)
        {
            return WriteMemory(process_address, buf, mem_size, error);
        }
        else
        {
            error.SetErrorToGenericError();
            error.SetErrorString ("Couldn't write scalar: failed to get scalar as memory data");
        }
    }
    else
    {
        error.SetErrorToGenericError();
        error.SetErrorString ("Couldn't write scalar: its size was zero");
    }
    return;
}

addr_t
ProcessFreeBSD::DoAllocateMemory(size_t size, uint32_t permissions,
                               Error &error)
{
    addr_t allocated_addr = LLDB_INVALID_ADDRESS;

    unsigned prot = 0;
    if (permissions & lldb::ePermissionsReadable)
        prot |= eMmapProtRead;
    if (permissions & lldb::ePermissionsWritable)
        prot |= eMmapProtWrite;
    if (permissions & lldb::ePermissionsExecutable)
        prot |= eMmapProtExec;

    if (InferiorCallMmap(this, allocated_addr, 0, size, prot,
                         eMmapFlagsAnon | eMmapFlagsPrivate, -1, 0)) {
        m_addr_to_mmap_size[allocated_addr] = size;
        error.Clear();
    } else {
        allocated_addr = LLDB_INVALID_ADDRESS;
        error.SetErrorStringWithFormat("unable to allocate %zu bytes of memory with permissions %s", size, GetPermissionsAsCString (permissions));
    }

    return allocated_addr;
}

bool
CommunicationKDP::SendRawRequest (uint8_t command_byte,
                                  const void *src,  // Raw packet payload bytes
                                  uint32_t src_len, // Raw packet payload length
                                  DataExtractor &reply_packet,
                                  Error &error)
{
    PacketStreamType request_packet (Stream::eBinary, m_addr_byte_size, m_byte_order);
    // Size is header + address size + uint32_t length
    const uint32_t command_length = 8 + src_len;
    const CommandType command = (CommandType)command_byte;
    const uint32_t request_sequence_id = m_request_sequence_id;
    MakeRequestPacketHeader (command, request_packet, command_length);
    request_packet.PutRawBytes(src, src_len);

    if (SendRequestAndGetReply (command, request_sequence_id, request_packet, reply_packet))
    {
        uint32_t offset = 8;
        uint32_t kdp_error = reply_packet.GetU32 (&offset);
        if (kdp_error)
            error.SetErrorStringWithFormat ("request packet 0x%8.8x failed (error %u)", command_byte, kdp_error);
        else
        {
            error.Clear();
            return true;
        }
    }
    else
    {
        error.SetErrorString ("failed to send packet");
    }
    return false;
}

std::unique_ptr<Socket> Socket::Create(const SocketProtocol protocol, bool child_processes_inherit, Error &error)
{
    error.Clear();

    std::unique_ptr<Socket> socket_up;
    switch (protocol)
    {
    case ProtocolTcp:
        socket_up.reset(new TCPSocket(child_processes_inherit, error));
        break;
    case ProtocolUdp:
        socket_up.reset(new UDPSocket(child_processes_inherit, error));
        break;
    case ProtocolUnixDomain:
#ifndef LLDB_DISABLE_POSIX
        socket_up.reset(new DomainSocket(child_processes_inherit, error));
#else
        error.SetErrorString("Unix domain sockets are not supported on this platform.");
#endif
        break;
    case ProtocolUnixAbstract:
#ifdef __linux__
        socket_up.reset(new AbstractSocket(child_processes_inherit, error));
#else
        error.SetErrorString("Abstract domain sockets are not supported on this platform.");
#endif
        break;
    }

    if (error.Fail())
        socket_up.reset();

    return socket_up;
}

void IRMemoryMap::WritePointerToMemory(lldb::addr_t process_address,
                                       lldb::addr_t address, Error &error) {
  error.Clear();

  Scalar scalar(address);

  WriteScalarToMemory(process_address, scalar, GetAddressByteSize(), error);
}

OperatingSystemGo::Goroutine
OperatingSystemGo::CreateGoroutineAtIndex(uint64_t idx, Error &err)
{
    err.Clear();
    Goroutine result;
    ValueObjectSP g = m_allg_sp->GetSyntheticArrayMember(idx, true)->Dereference(err);
    if (err.Fail())
    {
        return result;
    }

    ConstString name("goid");
    ValueObjectSP val = g->GetChildMemberWithName(name, true);
    bool success = false;
    result.m_goid = val->GetValueAsUnsigned(0, &success);
    if (!success)
    {
        err.SetErrorToGenericError();
        err.SetErrorString("unable to read goid");
        return result;
    }
    name.SetCString("atomicstatus");
    val = g->GetChildMemberWithName(name, true);
    result.m_status = (uint32_t)val->GetValueAsUnsigned(0, &success);
    if (!success)
    {
        err.SetErrorToGenericError();
        err.SetErrorString("unable to read atomicstatus");
        return result;
    }
    name.SetCString("sched");
    val = g->GetChildMemberWithName(name, true);
    result.m_gobuf = val->GetAddressOf(false);
    name.SetCString("stack");
    val = g->GetChildMemberWithName(name, true);
    name.SetCString("lo");
    ValueObjectSP child = val->GetChildMemberWithName(name, true);
    result.m_lostack = child->GetValueAsUnsigned(0, &success);
    if (!success)
    {
        err.SetErrorToGenericError();
        err.SetErrorString("unable to read stack.lo");
        return result;
    }
    name.SetCString("hi");
    child = val->GetChildMemberWithName(name, true);
    result.m_histack = child->GetValueAsUnsigned(0, &success);
    if (!success)
    {
        err.SetErrorToGenericError();
        err.SetErrorString("unable to read stack.hi");
        return result;
    }
    return result;
}

Error
ClangExpressionParser::MakeDWARF ()
{
    Error err;
    
    llvm::Module *module = m_code_generator->GetModule();
    
    if (!module)
    {
        err.SetErrorToGenericError();
        err.SetErrorString("IR doesn't contain a module");
        return err;
    }
    
    ClangExpressionVariableList *local_variables = m_expr.LocalVariables();
    ClangExpressionDeclMap *decl_map = m_expr.DeclMap();
    
    if (!local_variables)
    {
        err.SetErrorToGenericError();
        err.SetErrorString("Can't convert an expression without a VariableList to DWARF");
        return err;
    }
    
    if (!decl_map)
    {
        err.SetErrorToGenericError();
        err.SetErrorString("Can't convert an expression without a DeclMap to DWARF");
        return err;
    }
    
    std::string function_name;
    
    if (!FindFunctionInModule(function_name, module, m_expr.FunctionName()))
    {
        err.SetErrorToGenericError();
        err.SetErrorStringWithFormat("Couldn't find %s() in the module", m_expr.FunctionName());
        return err;
    }
    
    IRToDWARF ir_to_dwarf(*local_variables, decl_map, m_expr.DwarfOpcodeStream(), function_name.c_str());
    
    if (!ir_to_dwarf.runOnModule(*module))
    {
        err.SetErrorToGenericError();
        err.SetErrorString("Couldn't convert the expression to DWARF");
        return err;
    }
    
    err.Clear();
    return err;
}

lldb::ProcessSP PlatformRemoteGDBServer::Attach(
    ProcessAttachInfo &attach_info, Debugger &debugger,
    Target *target, // Can be NULL, if NULL create a new target, else use
                    // existing one
    Error &error) {
  lldb::ProcessSP process_sp;
  if (IsRemote()) {
    if (IsConnected()) {
      lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
      std::string connect_url;
      if (!LaunchGDBServer(debugserver_pid, connect_url)) {
        error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
                                       GetHostname());
      } else {
        if (target == NULL) {
          TargetSP new_target_sp;

          error = debugger.GetTargetList().CreateTarget(
              debugger, NULL, NULL, false, NULL, new_target_sp);
          target = new_target_sp.get();
        } else
          error.Clear();

        if (target && error.Success()) {
          debugger.GetTargetList().SetSelectedTarget(target);

          // The darwin always currently uses the GDB remote debugger plug-in
          // so even when debugging locally we are debugging remotely!
          process_sp = target->CreateProcess(
              attach_info.GetListenerForProcess(debugger), "gdb-remote", NULL);
          if (process_sp) {
            error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
            if (error.Success()) {
              ListenerSP listener_sp = attach_info.GetHijackListener();
              if (listener_sp)
                process_sp->HijackProcessEvents(listener_sp);
              error = process_sp->Attach(attach_info);
            }

            if (error.Fail() && debugserver_pid != LLDB_INVALID_PROCESS_ID) {
              KillSpawnedProcess(debugserver_pid);
            }
          }
        }
      }
    } else {
      error.SetErrorString("not connected to remote gdb server");
    }
  }
  return process_sp;
}

std::unique_ptr<Acceptor> Acceptor::Create(StringRef name,
                                           const bool child_processes_inherit,
                                           Error &error) {
  error.Clear();

  Socket::SocketProtocol socket_protocol = Socket::ProtocolUnixDomain;
  int port;
  std::string scheme, host, path;
  // Try to match socket name as URL - e.g., tcp://localhost:5555
  if (UriParser::Parse(name.str(), scheme, host, port, path)) {
    if (!FindProtocolByScheme(scheme.c_str(), socket_protocol))
      error.SetErrorStringWithFormat("Unknown protocol scheme \"%s\"",
                                     scheme.c_str());
    else
      name = name.drop_front(scheme.size() + strlen("://"));
  } else {
    std::string host_str;
    std::string port_str;
    int32_t port = INT32_MIN;
    // Try to match socket name as $host:port - e.g., localhost:5555
    if (Socket::DecodeHostAndPort(name, host_str, port_str, port, nullptr))
      socket_protocol = Socket::ProtocolTcp;
  }

  if (error.Fail())
    return std::unique_ptr<Acceptor>();

  std::unique_ptr<Socket> listener_socket_up =
      Socket::Create(socket_protocol, child_processes_inherit, error);

  LocalSocketIdFunc local_socket_id;
  if (error.Success()) {
    if (listener_socket_up->GetSocketProtocol() == Socket::ProtocolTcp) {
      TCPSocket *tcp_socket =
          static_cast<TCPSocket *>(listener_socket_up.get());
      local_socket_id = [tcp_socket]() {
        auto local_port = tcp_socket->GetLocalPortNumber();
        return (local_port != 0) ? llvm::to_string(local_port) : "";
      };
    } else {
      const std::string socket_name = name;
      local_socket_id = [socket_name]() { return socket_name; };
    }

    return std::unique_ptr<Acceptor>(
        new Acceptor(std::move(listener_socket_up), name, local_socket_id));
  }

  return std::unique_ptr<Acceptor>();
}

void
IRMemoryMap::Free (lldb::addr_t process_address, Error &error)
{
    error.Clear();
    
    AllocationMap::iterator iter = m_allocations.find(process_address);
    
    if (iter == m_allocations.end())
    {
        error.SetErrorToGenericError();
        error.SetErrorString("Couldn't free: allocation doesn't exist");
        return;
    }
    
    Allocation &allocation = iter->second;
        
    switch (allocation.m_policy)
    {
    default:
    case eAllocationPolicyHostOnly:
        {
            lldb::ProcessSP process_sp = m_process_wp.lock();
            if (process_sp)
            {
                if (process_sp->CanJIT() && process_sp->IsAlive())
                    process_sp->DeallocateMemory(allocation.m_process_alloc); // FindSpace allocated this for real
            }
    
            break;
        }
    case eAllocationPolicyMirror:
    case eAllocationPolicyProcessOnly:
        {
            lldb::ProcessSP process_sp = m_process_wp.lock();
            if (process_sp)
                process_sp->DeallocateMemory(allocation.m_process_alloc);
        }
    }
    
    if (lldb_private::Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS))
    {        
        log->Printf("IRMemoryMap::Free (0x%" PRIx64 ") freed [0x%" PRIx64 "..0x%" PRIx64 ")",
                    (uint64_t)process_address,
                    iter->second.m_process_start,
                    iter->second.m_process_start + iter->second.m_size);
    }
    
    m_allocations.erase(iter);
}

Error TCPSocket::Connect(llvm::StringRef name) {
  if (m_socket == kInvalidSocketValue)
    return Error("Invalid socket");

  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_COMMUNICATION));
  if (log)
    log->Printf("TCPSocket::%s (host/port = %s)", __FUNCTION__, name.data());

  Error error;
  std::string host_str;
  std::string port_str;
  int32_t port = INT32_MIN;
  if (!DecodeHostAndPort(name, host_str, port_str, port, &error))
    return error;

  struct sockaddr_in sa;
  ::memset(&sa, 0, sizeof(sa));
  sa.sin_family = kDomain;
  sa.sin_port = htons(port);

  int inet_pton_result = ::inet_pton(kDomain, host_str.c_str(), &sa.sin_addr);

  if (inet_pton_result <= 0) {
    struct hostent *host_entry = gethostbyname(host_str.c_str());
    if (host_entry)
      host_str = ::inet_ntoa(*(struct in_addr *)*host_entry->h_addr_list);
    inet_pton_result = ::inet_pton(kDomain, host_str.c_str(), &sa.sin_addr);
    if (inet_pton_result <= 0) {
      if (inet_pton_result == -1)
        SetLastError(error);
      else
        error.SetErrorStringWithFormat("invalid host string: '%s'",
                                       host_str.c_str());

      return error;
    }
  }

  if (-1 ==
      ::connect(GetNativeSocket(), (const struct sockaddr *)&sa, sizeof(sa))) {
    SetLastError(error);
    return error;
  }

  // Keep our TCP packets coming without any delays.
  SetOptionNoDelay();
  error.Clear();
  return error;
}

void IRMemoryMap::Leak(lldb::addr_t process_address, Error &error) {
  error.Clear();

  AllocationMap::iterator iter = m_allocations.find(process_address);

  if (iter == m_allocations.end()) {
    error.SetErrorToGenericError();
    error.SetErrorString("Couldn't leak: allocation doesn't exist");
    return;
  }

  Allocation &allocation = iter->second;

  allocation.m_leak = true;
}

void
IRMemoryMap::ReadPointerFromMemory (lldb::addr_t *address, lldb::addr_t process_address, Error &error)
{
    error.Clear();
    
    Scalar pointer_scalar;
    ReadScalarFromMemory(pointer_scalar, process_address, GetAddressByteSize(), error);
    
    if (!error.Success())
        return;
    
    *address = pointer_scalar.ULongLong();
    
    return;
}