C++ Args::empty方法代码示例

  bool DoExecute(Args &args, CommandReturnObject &result) override {
    if (args.empty()) {
      Log::ListAllLogChannels(&result.GetOutputStream());
      result.SetStatus(eReturnStatusSuccessFinishResult);
    } else {
      for (auto &entry : args.entries()) {
        Log::Callbacks log_callbacks;

        if (Log::GetLogChannelCallbacks(ConstString(entry.ref),
                                        log_callbacks)) {
          log_callbacks.list_categories(&result.GetOutputStream());
          result.SetStatus(eReturnStatusSuccessFinishResult);
        } else if (entry.ref == "all") {
          Log::ListAllLogChannels(&result.GetOutputStream());
          result.SetStatus(eReturnStatusSuccessFinishResult);
        } else {
          LogChannelSP log_channel_sp(LogChannel::FindPlugin(entry.c_str()));
          if (log_channel_sp) {
            log_channel_sp->ListCategories(&result.GetOutputStream());
            result.SetStatus(eReturnStatusSuccessFinishNoResult);
          } else
            result.AppendErrorWithFormat("Invalid log channel '%s'.\n",
                                         entry.c_str());
        }
      }
    }
    return result.Succeeded();
  }

  bool DoExecute(Args &command, CommandReturnObject &result) override {
    if (!command.empty()) {
      result.AppendErrorWithFormat("'%s' takes no arguments",
                                   m_cmd_name.c_str());
      return false;
    }

    auto &r = repro::Reproducer::Instance();
    if (auto generator = r.GetGenerator()) {
      generator->Keep();
    } else if (r.GetLoader()) {
      // Make this operation a NOP in replay mode.
      result.SetStatus(eReturnStatusSuccessFinishNoResult);
      return result.Succeeded();
    } else {
      result.AppendErrorWithFormat("Unable to get the reproducer generator");
      result.SetStatus(eReturnStatusFailed);
      return false;
    }

    result.GetOutputStream()
        << "Reproducer written to '" << r.GetReproducerPath() << "'\n";

    result.SetStatus(eReturnStatusSuccessFinishResult);
    return result.Succeeded();
  }

bool CommandObjectArgs::DoExecute(Args &args, CommandReturnObject &result) {
  ConstString target_triple;

  Process *process = m_exe_ctx.GetProcessPtr();
  if (!process) {
    result.AppendError("Args found no process.");
    result.SetStatus(eReturnStatusFailed);
    return false;
  }

  const ABI *abi = process->GetABI().get();
  if (!abi) {
    result.AppendError("The current process has no ABI.");
    result.SetStatus(eReturnStatusFailed);
    return false;
  }

  if (args.empty()) {
    result.AppendError("args requires at least one argument");
    result.SetStatus(eReturnStatusFailed);
    return false;
  }

  Thread *thread = m_exe_ctx.GetThreadPtr();

  if (!thread) {
    result.AppendError("args found no thread.");
    result.SetStatus(eReturnStatusFailed);
    return false;
  }

  lldb::StackFrameSP thread_cur_frame = thread->GetSelectedFrame();
  if (!thread_cur_frame) {
    result.AppendError("The current thread has no current frame.");
    result.SetStatus(eReturnStatusFailed);
    return false;
  }

  ModuleSP thread_module_sp(
      thread_cur_frame->GetFrameCodeAddress().GetModule());
  if (!thread_module_sp) {
    result.AppendError("The PC has no associated module.");
    result.SetStatus(eReturnStatusFailed);
    return false;
  }

  TypeSystem *type_system =
      thread_module_sp->GetTypeSystemForLanguage(eLanguageTypeC);
  if (type_system == nullptr) {
    result.AppendError("Unable to create C type system.");
    result.SetStatus(eReturnStatusFailed);
    return false;
  }

  ValueList value_list;

  for (auto &arg_entry : args.entries()) {
    llvm::StringRef arg_type = arg_entry.ref;
    Value value;
    value.SetValueType(Value::eValueTypeScalar);
    CompilerType compiler_type;

    std::size_t int_pos = arg_type.find("int");
    if (int_pos != llvm::StringRef::npos) {
      Encoding encoding = eEncodingSint;

      int width = 0;

      if (int_pos > 1) {
        result.AppendErrorWithFormat("Invalid format: %s.\n",
                                     arg_entry.c_str());
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
      if (int_pos == 1 && arg_type[0] != 'u') {
        result.AppendErrorWithFormat("Invalid format: %s.\n",
                                     arg_entry.c_str());
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
      if (arg_type[0] == 'u') {
        encoding = eEncodingUint;
      }

      llvm::StringRef width_spec = arg_type.drop_front(int_pos + 3);

      auto exp_result = llvm::StringSwitch<llvm::Optional<int>>(width_spec)
                            .Case("8_t", 8)
                            .Case("16_t", 16)
                            .Case("32_t", 32)
                            .Case("64_t", 64)
                            .Default(llvm::None);
      if (!exp_result.hasValue()) {
        result.AppendErrorWithFormat("Invalid format: %s.\n",
                                     arg_entry.c_str());
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
      width = *exp_result;

//.........这里部分代码省略.........

  bool DoExecute(Args &command, CommandReturnObject &result) override {
    // No need to check "frame" for validity as eCommandRequiresFrame ensures it
    // is valid
    StackFrame *frame = m_exe_ctx.GetFramePtr();

    Stream &s = result.GetOutputStream();

    // Be careful about the stack frame, if any summary formatter runs code, it
    // might clear the StackFrameList
    // for the thread.  So hold onto a shared pointer to the frame so it stays
    // alive.

    VariableList *variable_list =
        frame->GetVariableList(m_option_variable.show_globals);

    VariableSP var_sp;
    ValueObjectSP valobj_sp;

    const char *name_cstr = nullptr;
    size_t idx;

    TypeSummaryImplSP summary_format_sp;
    if (!m_option_variable.summary.IsCurrentValueEmpty())
      DataVisualization::NamedSummaryFormats::GetSummaryFormat(
          ConstString(m_option_variable.summary.GetCurrentValue()),
          summary_format_sp);
    else if (!m_option_variable.summary_string.IsCurrentValueEmpty())
      summary_format_sp.reset(new StringSummaryFormat(
          TypeSummaryImpl::Flags(),
          m_option_variable.summary_string.GetCurrentValue()));

    DumpValueObjectOptions options(m_varobj_options.GetAsDumpOptions(
        eLanguageRuntimeDescriptionDisplayVerbosityFull, eFormatDefault,
        summary_format_sp));

    const SymbolContext &sym_ctx =
        frame->GetSymbolContext(eSymbolContextFunction);
    if (sym_ctx.function && sym_ctx.function->IsTopLevelFunction())
      m_option_variable.show_globals = true;

    if (variable_list) {
      const Format format = m_option_format.GetFormat();
      options.SetFormat(format);

      if (!command.empty()) {
        VariableList regex_var_list;

        // If we have any args to the variable command, we will make
        // variable objects from them...
        for (idx = 0; (name_cstr = command.GetArgumentAtIndex(idx)) != nullptr;
             ++idx) {
          if (m_option_variable.use_regex) {
            const size_t regex_start_index = regex_var_list.GetSize();
            llvm::StringRef name_str(name_cstr);
            RegularExpression regex(name_str);
            if (regex.Compile(name_str)) {
              size_t num_matches = 0;
              const size_t num_new_regex_vars =
                  variable_list->AppendVariablesIfUnique(regex, regex_var_list,
                                                         num_matches);
              if (num_new_regex_vars > 0) {
                for (size_t regex_idx = regex_start_index,
                            end_index = regex_var_list.GetSize();
                     regex_idx < end_index; ++regex_idx) {
                  var_sp = regex_var_list.GetVariableAtIndex(regex_idx);
                  if (var_sp) {
                    valobj_sp = frame->GetValueObjectForFrameVariable(
                        var_sp, m_varobj_options.use_dynamic);
                    if (valobj_sp) {
                      //                                            if (format
                      //                                            !=
                      //                                            eFormatDefault)
                      //                                                valobj_sp->SetFormat
                      //                                                (format);

                      std::string scope_string;
                      if (m_option_variable.show_scope)
                        scope_string = GetScopeString(var_sp).str();

                      if (!scope_string.empty())
                        s.PutCString(scope_string);

                      if (m_option_variable.show_decl &&
                          var_sp->GetDeclaration().GetFile()) {
                        bool show_fullpaths = false;
                        bool show_module = true;
                        if (var_sp->DumpDeclaration(&s, show_fullpaths,
                                                    show_module))
                          s.PutCString(": ");
                      }
                      valobj_sp->Dump(result.GetOutputStream(), options);
                    }
                  }
                }
              } else if (num_matches == 0) {
                result.GetErrorStream().Printf("error: no variables matched "
                                               "the regular expression '%s'.\n",
                                               name_cstr);
              }
            } else {
//.........这里部分代码省略.........

bool CommandObjectDisassemble::DoExecute(Args &command,
                                         CommandReturnObject &result) {
  Target *target = m_interpreter.GetDebugger().GetSelectedTarget().get();
  if (target == nullptr) {
    result.AppendError("invalid target, create a debug target using the "
                       "'target create' command");
    result.SetStatus(eReturnStatusFailed);
    return false;
  }
  if (!m_options.arch.IsValid())
    m_options.arch = target->GetArchitecture();

  if (!m_options.arch.IsValid()) {
    result.AppendError(
        "use the --arch option or set the target architecture to disassemble");
    result.SetStatus(eReturnStatusFailed);
    return false;
  }

  const char *plugin_name = m_options.GetPluginName();
  const char *flavor_string = m_options.GetFlavorString();

  DisassemblerSP disassembler =
      Disassembler::FindPlugin(m_options.arch, flavor_string, plugin_name);

  if (!disassembler) {
    if (plugin_name) {
      result.AppendErrorWithFormat(
          "Unable to find Disassembler plug-in named '%s' that supports the "
          "'%s' architecture.\n",
          plugin_name, m_options.arch.GetArchitectureName());
    } else
      result.AppendErrorWithFormat(
          "Unable to find Disassembler plug-in for the '%s' architecture.\n",
          m_options.arch.GetArchitectureName());
    result.SetStatus(eReturnStatusFailed);
    return false;
  } else if (flavor_string != nullptr &&
             !disassembler->FlavorValidForArchSpec(m_options.arch,
                                                   flavor_string))
    result.AppendWarningWithFormat(
        "invalid disassembler flavor \"%s\", using default.\n", flavor_string);

  result.SetStatus(eReturnStatusSuccessFinishResult);

  if (!command.empty()) {
    result.AppendErrorWithFormat(
        "\"disassemble\" arguments are specified as options.\n");
    const int terminal_width =
        GetCommandInterpreter().GetDebugger().GetTerminalWidth();
    GetOptions()->GenerateOptionUsage(result.GetErrorStream(), this,
                                      terminal_width);
    result.SetStatus(eReturnStatusFailed);
    return false;
  }

  if (m_options.show_mixed && m_options.num_lines_context == 0)
    m_options.num_lines_context = 2;

  // Always show the PC in the disassembly
  uint32_t options = Disassembler::eOptionMarkPCAddress;

  // Mark the source line for the current PC only if we are doing mixed source
  // and assembly
  if (m_options.show_mixed)
    options |= Disassembler::eOptionMarkPCSourceLine;

  if (m_options.show_bytes)
    options |= Disassembler::eOptionShowBytes;

  if (m_options.raw)
    options |= Disassembler::eOptionRawOuput;

  if (!m_options.func_name.empty()) {
    ConstString name(m_options.func_name.c_str());

    if (Disassembler::Disassemble(
            m_interpreter.GetDebugger(), m_options.arch, plugin_name,
            flavor_string, m_exe_ctx, name,
            nullptr, // Module *
            m_options.num_instructions, m_options.show_mixed,
            m_options.show_mixed ? m_options.num_lines_context : 0, options,
            result.GetOutputStream())) {
      result.SetStatus(eReturnStatusSuccessFinishResult);
    } else {
      result.AppendErrorWithFormat("Unable to find symbol with name '%s'.\n",
                                   name.GetCString());
      result.SetStatus(eReturnStatusFailed);
    }
  } else {
    std::vector<AddressRange> ranges;
    AddressRange range;
    StackFrame *frame = m_exe_ctx.GetFramePtr();
    if (m_options.frame_line) {
      if (frame == nullptr) {
        result.AppendError("Cannot disassemble around the current line without "
                           "a selected frame.\n");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
//.........这里部分代码省略.........

	integer ServiceApp::startCommand(ConstStrA command, const Args & args, SeqFileOutput &serr) {
		if (command == ConstStrA(startCmd)) {
			integer x = validateService(args,serr);
			if (x) return x;
			createInstanceFile();
			x = onMessage(command,args,serr);
			if (x) return x;
			x = initService(args,serr);
			if (x) return x;
			serr = nil;
			instance->enterDaemonMode(restartDelaySec);
			return startService();
		} else if (command == ConstStrA(startForeCmd)) {
			integer x = validateService(args,serr);
			if (x) return x;
			createInstanceFile();
			x = onMessage(command,args,serr);
			if (x) return x;
			x = initService(args,serr);
			if (x) return x;
			return startService();
		} else if (command == ConstStrA(restartCmd)){
			integer x = validateService(args,serr);
			if (x) return x;
			try {
				instance->open();
				postMessage(stopCmd,Args(), serr);
				instance->waitForTerminate(timeout);
			} catch (ProgInstance::NotRunningException &) {
			} catch (ProgInstance::TimeoutException &) {
				instance->terminate();
				instance->waitForTerminate(timeout);
			}
			createInstanceFile();
			x = onMessage(command,args,serr);
			if (x) return x;
			x = initService(args,serr);
			if (x) return x;
			serr = nil;
			instance->enterDaemonMode(restartDelaySec);
			return startService();
		} else if (command == ConstStrA(stopCmd)) {
			try {
				instance->open();
				integer res = postMessage(command,args, serr);
				if (res == 0) instance->waitForTerminate(timeout);
				return res;
			} catch (ProgInstance::TimeoutException &) {
				instance->terminate();
				return 0;
			}
		} else if (command == ConstStrA(waitCmd)) {
			natural timeout = naturalNull;
			if (!args.empty()) {
				TextParser<wchar_t> parser;
				if (parser(L" %u1 ",args[0])) timeout = parser[1];
			}
			instance->open();
			instance->waitForTerminate(timeout);
		}
		else if (command == ConstStrA(testCmd)) {
			integer x = validateService(args, serr);
			return x;
		} else if (command == ConstStrA(runTestsCmd)) {
			if (args.empty())
				return Singleton<TestCollector>::getInstance().runTests(ConstStrA(), serr);
			else if (args[0] == ConstStrW(L"list")) {
				SeqTextOutA out(serr);
				TextOut<SeqTextOutA> print(out);
				print("%1\n")<<(Singleton<TestCollector>::getInstance().listTests());
				return 0;
			}
			else
				return Singleton<TestCollector>::getInstance().runTests(args[1], serr);
		
		} else {
			instance->open();
			return postMessage(command,args, serr);
		}
		return 0;
	}