Start to clean up the process of defining command arguments. (#83097)

Partly, there's just a lot of unnecessary boiler plate. It's also
possible to define combinations of arguments that make no sense (e.g.
eArgRepeatPlus followed by eArgRepeatPlain...) but these are never
checked since we just push_back directly into the argument definitions.

This commit is step 1 of this cleanup - do the obvious stuff. In it, all
the simple homogenous argument lists and the breakpoint/watchpoint
ID/Range types, are set with common functions. This is an NFC change, it
just centralizes boiler plate. There's no checking yet because you can't
get a single argument wrong.

The end goal is that all argument definition goes through functions and
m_arguments is hidden so that you can't define inconsistent argument
sets.

28 files changed, 162 insertions, 987 deletions

diff --git a/lldb/include/lldb/Interpreter/CommandObject.h b/lldb/include/lldb/Interpreter/CommandObject.h
index a326c6d..a641a46 100644
--- a/lldb/include/lldb/Interpreter/CommandObject.h
+++ b/lldb/include/lldb/Interpreter/CommandObject.h
@@ -207,6 +207,20 @@ public:
   static const ArgumentTableEntry *
   FindArgumentDataByType(lldb::CommandArgumentType arg_type);
 
+  // Sets the argument list for this command to one homogenous argument type,
+  // with the repeat specified.
+  void AddSimpleArgumentList(
+      lldb::CommandArgumentType arg_type,
+      ArgumentRepetitionType repetition_type = eArgRepeatPlain);
+
+  // Helper function to set BP IDs or ID ranges as the command argument data
+  // for this command.
+  // This used to just populate an entry you could add to, but that was never
+  // used.  If we ever need that we can take optional extra args here.
+  // Use this to define a simple argument list:
+  enum IDType { eBreakpointArgs = 0, eWatchpointArgs = 1 };
+  void AddIDsArgumentData(IDType type);
+
   int GetNumArgumentEntries();
 
   CommandArgumentEntry *GetArgumentEntryAtIndex(int idx);
@@ -391,12 +405,6 @@ protected:
   lldb_private::CommandOverrideCallbackWithResult m_command_override_callback;
   void *m_command_override_baton;
   bool m_is_user_command = false;
-
-  // Helper function to populate IDs or ID ranges as the command argument data
-  // to the specified command argument entry.
-  static void AddIDsArgumentData(CommandArgumentEntry &arg,
-                                 lldb::CommandArgumentType ID,
-                                 lldb::CommandArgumentType IDRange);
 };
 
 class CommandObjectParsed : public CommandObject {
diff --git a/lldb/source/Commands/CommandObjectApropos.cpp b/lldb/source/Commands/CommandObjectApropos.cpp
index 88c214d..d663f2b 100644
--- a/lldb/source/Commands/CommandObjectApropos.cpp
+++ b/lldb/source/Commands/CommandObjectApropos.cpp
@@ -21,19 +21,7 @@ CommandObjectApropos::CommandObjectApropos(CommandInterpreter &interpreter)
     : CommandObjectParsed(
           interpreter, "apropos",
           "List debugger commands related to a word or subject.", nullptr) {
-  CommandArgumentEntry arg;
-  CommandArgumentData search_word_arg;
-
-  // Define the first (and only) variant of this arg.
-  search_word_arg.arg_type = eArgTypeSearchWord;
-  search_word_arg.arg_repetition = eArgRepeatPlain;
-
-  // There is only one variant this argument could be; put it into the argument
-  // entry.
-  arg.push_back(search_word_arg);
-
-  // Push the data for the first argument into the m_arguments vector.
-  m_arguments.push_back(arg);
+  AddSimpleArgumentList(eArgTypeSearchWord);
 }
 
 CommandObjectApropos::~CommandObjectApropos() = default;
diff --git a/lldb/source/Commands/CommandObjectBreakpoint.cpp b/lldb/source/Commands/CommandObjectBreakpoint.cpp
index cfb0b87..fbece86 100644
--- a/lldb/source/Commands/CommandObjectBreakpoint.cpp
+++ b/lldb/source/Commands/CommandObjectBreakpoint.cpp
@@ -813,12 +813,7 @@ public:
                             "With the exception of -e, -d and -i, passing an "
                             "empty argument clears the modification.",
                             nullptr) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeBreakpointID,
-                                      eArgTypeBreakpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eBreakpointArgs);
 
     m_options.Append(&m_bp_opts,
                      LLDB_OPT_SET_1 | LLDB_OPT_SET_2 | LLDB_OPT_SET_3,
@@ -890,12 +885,7 @@ public:
                             "Enable the specified disabled breakpoint(s). If "
                             "no breakpoints are specified, enable all of them.",
                             nullptr) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeBreakpointID,
-                                      eArgTypeBreakpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eBreakpointArgs);
   }
 
   ~CommandObjectBreakpointEnable() override = default;
@@ -1002,12 +992,7 @@ execution will NOT stop at location 1.1.  To achieve that, type:
         "The first command disables all locations for breakpoint 1, \
 the second re-enables the first location.");
 
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeBreakpointID,
-                                      eArgTypeBreakpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eBreakpointArgs);
   }
 
   ~CommandObjectBreakpointDisable() override = default;
@@ -1098,15 +1083,7 @@ public:
     CommandArgumentData bp_id_arg;
 
     // Define the first (and only) variant of this arg.
-    bp_id_arg.arg_type = eArgTypeBreakpointID;
-    bp_id_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(bp_id_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeBreakpointID, eArgRepeatOptional);
   }
 
   ~CommandObjectBreakpointList() override = default;
@@ -1372,12 +1349,7 @@ public:
                             "Delete the specified breakpoint(s).  If no "
                             "breakpoints are specified, delete them all.",
                             nullptr) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeBreakpointID,
-                                      eArgTypeBreakpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eBreakpointArgs);
   }
 
   ~CommandObjectBreakpointDelete() override = default;
@@ -1677,14 +1649,7 @@ public:
             "on the name.",
             "breakpoint name configure <command-options> "
             "<breakpoint-name-list>") {
-    // Create the first variant for the first (and only) argument for this
-    // command.
-    CommandArgumentEntry arg1;
-    CommandArgumentData id_arg;
-    id_arg.arg_type = eArgTypeBreakpointName;
-    id_arg.arg_repetition = eArgRepeatOptional;
-    arg1.push_back(id_arg);
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeBreakpointName, eArgRepeatOptional);
 
     m_option_group.Append(&m_bp_opts, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
     m_option_group.Append(&m_access_options, LLDB_OPT_SET_ALL,
@@ -1770,14 +1735,7 @@ public:
       : CommandObjectParsed(
             interpreter, "add", "Add a name to the breakpoints provided.",
             "breakpoint name add <command-options> <breakpoint-id-list>") {
-    // Create the first variant for the first (and only) argument for this
-    // command.
-    CommandArgumentEntry arg1;
-    CommandArgumentData id_arg;
-    id_arg.arg_type = eArgTypeBreakpointID;
-    id_arg.arg_repetition = eArgRepeatOptional;
-    arg1.push_back(id_arg);
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeBreakpointID, eArgRepeatOptional);
 
     m_option_group.Append(&m_name_options, LLDB_OPT_SET_1, LLDB_OPT_SET_ALL);
     m_option_group.Finalize();
@@ -1851,14 +1809,7 @@ public:
             interpreter, "delete",
             "Delete a name from the breakpoints provided.",
             "breakpoint name delete <command-options> <breakpoint-id-list>") {
-    // Create the first variant for the first (and only) argument for this
-    // command.
-    CommandArgumentEntry arg1;
-    CommandArgumentData id_arg;
-    id_arg.arg_type = eArgTypeBreakpointID;
-    id_arg.arg_repetition = eArgRepeatOptional;
-    arg1.push_back(id_arg);
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeBreakpointID, eArgRepeatOptional);
 
     m_option_group.Append(&m_name_options, LLDB_OPT_SET_1, LLDB_OPT_SET_ALL);
     m_option_group.Finalize();
@@ -2308,12 +2259,7 @@ public:
                             "be read in with \"breakpoint read\".  "
                             "If given no arguments, writes all breakpoints.",
                             nullptr) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeBreakpointID,
-                                      eArgTypeBreakpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eBreakpointArgs);
   }
 
   ~CommandObjectBreakpointWrite() override = default;
diff --git a/lldb/source/Commands/CommandObjectBreakpointCommand.cpp b/lldb/source/Commands/CommandObjectBreakpointCommand.cpp
index fefafcd..6ebe6e8 100644
--- a/lldb/source/Commands/CommandObjectBreakpointCommand.cpp
+++ b/lldb/source/Commands/CommandObjectBreakpointCommand.cpp
@@ -185,19 +185,7 @@ are no syntax errors may indicate that a function was declared but never called.
                          LLDB_OPT_SET_2);
     m_all_options.Finalize();
 
-    CommandArgumentEntry arg;
-    CommandArgumentData bp_id_arg;
-
-    // Define the first (and only) variant of this arg.
-    bp_id_arg.arg_type = eArgTypeBreakpointID;
-    bp_id_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(bp_id_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeBreakpointID, eArgRepeatOptional);
   }
 
   ~CommandObjectBreakpointCommandAdd() override = default;
@@ -449,19 +437,7 @@ public:
       : CommandObjectParsed(interpreter, "delete",
                             "Delete the set of commands from a breakpoint.",
                             nullptr) {
-    CommandArgumentEntry arg;
-    CommandArgumentData bp_id_arg;
-
-    // Define the first (and only) variant of this arg.
-    bp_id_arg.arg_type = eArgTypeBreakpointID;
-    bp_id_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(bp_id_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeBreakpointID);
   }
 
   ~CommandObjectBreakpointCommandDelete() override = default;
@@ -565,19 +541,7 @@ public:
                             "List the script or set of commands to be "
                             "executed when the breakpoint is hit.",
                             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandArgumentData bp_id_arg;
-
-    // Define the first (and only) variant of this arg.
-    bp_id_arg.arg_type = eArgTypeBreakpointID;
-    bp_id_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(bp_id_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeBreakpointID);
   }
 
   ~CommandObjectBreakpointCommandList() override = default;
diff --git a/lldb/source/Commands/CommandObjectCommands.cpp b/lldb/source/Commands/CommandObjectCommands.cpp
index 7c459bd..f4903e3 100644
--- a/lldb/source/Commands/CommandObjectCommands.cpp
+++ b/lldb/source/Commands/CommandObjectCommands.cpp
@@ -41,19 +41,7 @@ public:
             interpreter, "command source",
             "Read and execute LLDB commands from the file <filename>.",
             nullptr) {
-    CommandArgumentEntry arg;
-    CommandArgumentData file_arg;
-
-    // Define the first (and only) variant of this arg.
-    file_arg.arg_type = eArgTypeFilename;
-    file_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(file_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeFilename);
   }
 
   ~CommandObjectCommandsSource() override = default;
@@ -614,19 +602,7 @@ public:
             interpreter, "command unalias",
             "Delete one or more custom commands defined by 'command alias'.",
             nullptr) {
-    CommandArgumentEntry arg;
-    CommandArgumentData alias_arg;
-
-    // Define the first (and only) variant of this arg.
-    alias_arg.arg_type = eArgTypeAliasName;
-    alias_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(alias_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeAliasName);
   }
 
   ~CommandObjectCommandsUnalias() override = default;
@@ -701,19 +677,7 @@ public:
             interpreter, "command delete",
             "Delete one or more custom commands defined by 'command regex'.",
             nullptr) {
-    CommandArgumentEntry arg;
-    CommandArgumentData alias_arg;
-
-    // Define the first (and only) variant of this arg.
-    alias_arg.arg_type = eArgTypeCommandName;
-    alias_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(alias_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeCommandName);
   }
 
   ~CommandObjectCommandsDelete() override = default;
@@ -815,8 +779,7 @@ a number follows 'f':"
         R"(
 
     (lldb) command regex f s/^$/finish/ 's/([0-9]+)/frame select %1/')");
-    CommandArgumentData thread_arg{eArgTypeSEDStylePair, eArgRepeatOptional};
-    m_arguments.push_back({thread_arg});
+    AddSimpleArgumentList(eArgTypeSEDStylePair, eArgRepeatOptional);
   }
 
   ~CommandObjectCommandsAddRegex() override = default;
@@ -1944,19 +1907,7 @@ public:
   CommandObjectCommandsScriptImport(CommandInterpreter &interpreter)
       : CommandObjectParsed(interpreter, "command script import",
                             "Import a scripting module in LLDB.", nullptr) {
-    CommandArgumentEntry arg1;
-    CommandArgumentData cmd_arg;
-
-    // Define the first (and only) variant of this arg.
-    cmd_arg.arg_type = eArgTypeFilename;
-    cmd_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(cmd_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeFilename, eArgRepeatPlus);
   }
 
   ~CommandObjectCommandsScriptImport() override = default;
@@ -2066,20 +2017,7 @@ public:
                             "command, and the last element will be the new "
                             "command name."),
         IOHandlerDelegateMultiline("DONE") {
-    CommandArgumentEntry arg1;
-    CommandArgumentData cmd_arg;
-
-    // This is one or more command names, which form the path to the command
-    // you want to add.
-    cmd_arg.arg_type = eArgTypeCommand;
-    cmd_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(cmd_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeCommand, eArgRepeatPlus);
   }
 
   ~CommandObjectCommandsScriptAdd() override = default;
@@ -2400,20 +2338,7 @@ public:
             interpreter, "command script delete",
             "Delete a scripted command by specifying the path to the command.",
             nullptr) {
-    CommandArgumentEntry arg1;
-    CommandArgumentData cmd_arg;
-
-    // This is a list of command names forming the path to the command
-    // to be deleted.
-    cmd_arg.arg_type = eArgTypeCommand;
-    cmd_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(cmd_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeCommand, eArgRepeatPlus);
   }
 
   ~CommandObjectCommandsScriptDelete() override = default;
@@ -2549,20 +2474,7 @@ public:
             "Add a container command to lldb.  Adding to built-"
             "in container commands is not allowed.",
             "command container add [[path1]...] container-name") {
-    CommandArgumentEntry arg1;
-    CommandArgumentData cmd_arg;
-
-    // This is one or more command names, which form the path to the command
-    // you want to add.
-    cmd_arg.arg_type = eArgTypeCommand;
-    cmd_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(cmd_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeCommand, eArgRepeatPlus);
   }
 
   ~CommandObjectCommandsContainerAdd() override = default;
@@ -2690,20 +2602,7 @@ public:
             "Delete a container command previously added to "
             "lldb.",
             "command container delete [[path1] ...] container-cmd") {
-    CommandArgumentEntry arg1;
-    CommandArgumentData cmd_arg;
-
-    // This is one or more command names, which form the path to the command
-    // you want to add.
-    cmd_arg.arg_type = eArgTypeCommand;
-    cmd_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(cmd_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeCommand, eArgRepeatPlus);
   }
 
   ~CommandObjectCommandsContainerDelete() override = default;
diff --git a/lldb/source/Commands/CommandObjectDWIMPrint.cpp b/lldb/source/Commands/CommandObjectDWIMPrint.cpp
index fb2cc106..b183cb4 100644
--- a/lldb/source/Commands/CommandObjectDWIMPrint.cpp
+++ b/lldb/source/Commands/CommandObjectDWIMPrint.cpp
@@ -37,8 +37,7 @@ CommandObjectDWIMPrint::CommandObjectDWIMPrint(CommandInterpreter &interpreter)
                        "dwim-print [<variable-name> | <expression>]",
                        eCommandProcessMustBePaused | eCommandTryTargetAPILock) {
 
-  CommandArgumentData var_name_arg(eArgTypeVarName, eArgRepeatPlain);
-  m_arguments.push_back({var_name_arg});
+  AddSimpleArgumentList(eArgTypeVarName);
 
   m_option_group.Append(&m_format_options,
                         OptionGroupFormat::OPTION_GROUP_FORMAT |
diff --git a/lldb/source/Commands/CommandObjectExpression.cpp b/lldb/source/Commands/CommandObjectExpression.cpp
index 3a2dc11..2319ddd 100644
--- a/lldb/source/Commands/CommandObjectExpression.cpp
+++ b/lldb/source/Commands/CommandObjectExpression.cpp
@@ -311,19 +311,7 @@ Examples:
     expr unsigned int $foo = 5
     expr char c[] = \"foo\"; c[0])");
 
-  CommandArgumentEntry arg;
-  CommandArgumentData expression_arg;
-
-  // Define the first (and only) variant of this arg.
-  expression_arg.arg_type = eArgTypeExpression;
-  expression_arg.arg_repetition = eArgRepeatPlain;
-
-  // There is only one variant this argument could be; put it into the argument
-  // entry.
-  arg.push_back(expression_arg);
-
-  // Push the data for the first argument into the m_arguments vector.
-  m_arguments.push_back(arg);
+  AddSimpleArgumentList(eArgTypeExpression);
 
   // Add the "--format" and "--gdb-format"
   m_option_group.Append(&m_format_options,
diff --git a/lldb/source/Commands/CommandObjectFrame.cpp b/lldb/source/Commands/CommandObjectFrame.cpp
index f092d54..b1d060b 100644
--- a/lldb/source/Commands/CommandObjectFrame.cpp
+++ b/lldb/source/Commands/CommandObjectFrame.cpp
@@ -113,19 +113,7 @@ public:
                             eCommandRequiresThread | eCommandTryTargetAPILock |
                                 eCommandProcessMustBeLaunched |
                                 eCommandProcessMustBePaused) {
-    CommandArgumentEntry arg;
-    CommandArgumentData index_arg;
-
-    // Define the first (and only) variant of this arg.
-    index_arg.arg_type = eArgTypeFrameIndex;
-    index_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(index_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeFrameIndex, eArgRepeatOptional);
   }
 
   ~CommandObjectFrameDiagnose() override = default;
@@ -269,19 +257,7 @@ public:
                             eCommandRequiresThread | eCommandTryTargetAPILock |
                                 eCommandProcessMustBeLaunched |
                                 eCommandProcessMustBePaused) {
-    CommandArgumentEntry arg;
-    CommandArgumentData index_arg;
-
-    // Define the first (and only) variant of this arg.
-    index_arg.arg_type = eArgTypeFrameIndex;
-    index_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(index_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeFrameIndex, eArgRepeatOptional);
   }
 
   ~CommandObjectFrameSelect() override = default;
@@ -409,19 +385,7 @@ However, 'frame variable' is more efficient, since it uses debug information and
 memory reads directly, rather than parsing and evaluating an expression, which
 may even involve JITing and running code in the target program.)");
 
-    CommandArgumentEntry arg;
-    CommandArgumentData var_name_arg;
-
-    // Define the first (and only) variant of this arg.
-    var_name_arg.arg_type = eArgTypeVarName;
-    var_name_arg.arg_repetition = eArgRepeatStar;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(var_name_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeVarName, eArgRepeatStar);
 
     m_option_group.Append(&m_option_variable, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
     m_option_group.Append(&m_option_format,
@@ -939,8 +903,7 @@ public:
       : CommandObjectParsed(interpreter, "frame recognizer delete",
                             "Delete an existing frame recognizer by id.",
                             nullptr) {
-    CommandArgumentData thread_arg{eArgTypeRecognizerID, eArgRepeatPlain};
-    m_arguments.push_back({thread_arg});
+    AddSimpleArgumentList(eArgTypeRecognizerID);
   }
 
   ~CommandObjectFrameRecognizerDelete() override = default;
@@ -1065,19 +1028,7 @@ public:
             interpreter, "frame recognizer info",
             "Show which frame recognizer is applied a stack frame (if any).",
             nullptr) {
-    CommandArgumentEntry arg;
-    CommandArgumentData index_arg;
-
-    // Define the first (and only) variant of this arg.
-    index_arg.arg_type = eArgTypeFrameIndex;
-    index_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(index_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeFrameIndex);
   }
 
   ~CommandObjectFrameRecognizerInfo() override = default;
diff --git a/lldb/source/Commands/CommandObjectHelp.cpp b/lldb/source/Commands/CommandObjectHelp.cpp
index ddb006e..f1dbd03 100644
--- a/lldb/source/Commands/CommandObjectHelp.cpp
+++ b/lldb/source/Commands/CommandObjectHelp.cpp
@@ -48,20 +48,9 @@ CommandObjectHelp::CommandObjectHelp(CommandInterpreter &interpreter)
                           "commands, or give details "
                           "about a specific command.",
                           "help [<cmd-name>]") {
-  CommandArgumentEntry arg;
-  CommandArgumentData command_arg;
-
   // A list of command names forming a path to the command we want help on.
   // No names is allowed - in which case we dump the top-level help.
-  command_arg.arg_type = eArgTypeCommand;
-  command_arg.arg_repetition = eArgRepeatStar;
-
-  // There is only one variant this argument could be; put it into the argument
-  // entry.
-  arg.push_back(command_arg);
-
-  // Push the data for the first argument into the m_arguments vector.
-  m_arguments.push_back(arg);
+  AddSimpleArgumentList(eArgTypeCommand, eArgRepeatStar);
 }
 
 CommandObjectHelp::~CommandObjectHelp() = default;
diff --git a/lldb/source/Commands/CommandObjectLog.cpp b/lldb/source/Commands/CommandObjectLog.cpp
index 6bfbf98..48dfd94 100644
--- a/lldb/source/Commands/CommandObjectLog.cpp
+++ b/lldb/source/Commands/CommandObjectLog.cpp
@@ -288,19 +288,7 @@ public:
                             "List the log categories for one or more log "
                             "channels.  If none specified, lists them all.",
                             nullptr) {
-    CommandArgumentEntry arg;
-    CommandArgumentData channel_arg;
-
-    // Define the first (and only) variant of this arg.
-    channel_arg.arg_type = eArgTypeLogChannel;
-    channel_arg.arg_repetition = eArgRepeatStar;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(channel_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeLogChannel, eArgRepeatStar);
   }
 
   ~CommandObjectLogList() override = default;
@@ -335,19 +323,7 @@ public:
   CommandObjectLogDump(CommandInterpreter &interpreter)
       : CommandObjectParsed(interpreter, "log dump",
                             "dump circular buffer logs", nullptr) {
-    CommandArgumentEntry arg1;
-    CommandArgumentData channel_arg;
-
-    // Define the first (and only) variant of this arg.
-    channel_arg.arg_type = eArgTypeLogChannel;
-    channel_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(channel_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeLogChannel);
   }
 
   ~CommandObjectLogDump() override = default;
@@ -444,19 +420,7 @@ public:
       : CommandObjectParsed(interpreter, "log timers enable",
                             "enable LLDB internal performance timers",
                             "log timers enable <depth>") {
-    CommandArgumentEntry arg;
-    CommandArgumentData depth_arg;
-
-    // Define the first (and only) variant of this arg.
-    depth_arg.arg_type = eArgTypeCount;
-    depth_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(depth_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeCount, eArgRepeatOptional);
   }
 
   ~CommandObjectLogTimerEnable() override = default;
@@ -559,19 +523,7 @@ public:
       : CommandObjectParsed(interpreter, "log timers increment",
                             "increment LLDB internal performance timers",
                             "log timers increment <bool>") {
-    CommandArgumentEntry arg;
-    CommandArgumentData bool_arg;
-
-    // Define the first (and only) variant of this arg.
-    bool_arg.arg_type = eArgTypeBoolean;
-    bool_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(bool_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeBoolean);
   }
 
   ~CommandObjectLogTimerIncrement() override = default;
diff --git a/lldb/source/Commands/CommandObjectPlatform.cpp b/lldb/source/Commands/CommandObjectPlatform.cpp
index b25c391..5b18f2b 100644
--- a/lldb/source/Commands/CommandObjectPlatform.cpp
+++ b/lldb/source/Commands/CommandObjectPlatform.cpp
@@ -155,8 +155,7 @@ public:
   {
     m_option_group.Append(&m_platform_options, LLDB_OPT_SET_ALL, 1);
     m_option_group.Finalize();
-    CommandArgumentData platform_arg{eArgTypePlatform, eArgRepeatPlain};
-    m_arguments.push_back({platform_arg});
+    AddSimpleArgumentList(eArgTypePlatform);
   }
 
   ~CommandObjectPlatformSelect() override = default;
@@ -276,8 +275,7 @@ public:
             interpreter, "platform connect",
             "Select the current platform by providing a connection URL.",
             "platform connect <connect-url>", 0) {
-    CommandArgumentData platform_arg{eArgTypeConnectURL, eArgRepeatPlain};
-    m_arguments.push_back({platform_arg});
+    AddSimpleArgumentList(eArgTypeConnectURL);
   }
 
   ~CommandObjectPlatformConnect() override = default;
@@ -418,8 +416,7 @@ public:
       : CommandObjectParsed(interpreter, "platform mkdir",
                             "Make a new directory on the remote end.", nullptr,
                             0) {
-    CommandArgumentData thread_arg{eArgTypeRemotePath, eArgRepeatPlain};
-    m_arguments.push_back({thread_arg});
+    AddSimpleArgumentList(eArgTypeRemotePath);
   }
 
   ~CommandObjectPlatformMkDir() override = default;
@@ -467,8 +464,7 @@ public:
   CommandObjectPlatformFOpen(CommandInterpreter &interpreter)
       : CommandObjectParsed(interpreter, "platform file open",
                             "Open a file on the remote end.", nullptr, 0) {
-    CommandArgumentData path_arg{eArgTypeRemotePath, eArgRepeatPlain};
-    m_arguments.push_back({path_arg});
+    AddSimpleArgumentList(eArgTypeRemotePath);
   }
 
   ~CommandObjectPlatformFOpen() override = default;
@@ -521,8 +517,7 @@ public:
   CommandObjectPlatformFClose(CommandInterpreter &interpreter)
       : CommandObjectParsed(interpreter, "platform file close",
                             "Close a file on the remote end.", nullptr, 0) {
-    CommandArgumentData path_arg{eArgTypeUnsignedInteger, eArgRepeatPlain};
-    m_arguments.push_back({path_arg});
+    AddSimpleArgumentList(eArgTypeUnsignedInteger);
   }
 
   ~CommandObjectPlatformFClose() override = default;
@@ -564,8 +559,7 @@ public:
       : CommandObjectParsed(interpreter, "platform file read",
                             "Read data from a file on the remote end.", nullptr,
                             0) {
-    CommandArgumentData path_arg{eArgTypeUnsignedInteger, eArgRepeatPlain};
-    m_arguments.push_back({path_arg});
+    AddSimpleArgumentList(eArgTypeUnsignedInteger);
   }
 
   ~CommandObjectPlatformFRead() override = default;
@@ -659,8 +653,7 @@ public:
       : CommandObjectParsed(interpreter, "platform file write",
                             "Write data to a file on the remote end.", nullptr,
                             0) {
-    CommandArgumentData path_arg{eArgTypeUnsignedInteger, eArgRepeatPlain};
-    m_arguments.push_back({path_arg});
+    AddSimpleArgumentList(eArgTypeUnsignedInteger);
   }
 
   ~CommandObjectPlatformFWrite() override = default;
@@ -863,18 +856,7 @@ public:
 
     Get the file size from the remote end with path /the/remote/file/path.)");
 
-    CommandArgumentEntry arg1;
-    CommandArgumentData file_arg_remote;
-
-    // Define the first (and only) variant of this arg.
-    file_arg_remote.arg_type = eArgTypeRemoteFilename;
-    file_arg_remote.arg_repetition = eArgRepeatPlain;
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(file_arg_remote);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeRemoteFilename);
   }
 
   ~CommandObjectPlatformGetSize() override = default;
@@ -922,18 +904,7 @@ public:
 
     Get the file permissions from the remote end with path /the/remote/file/path.)");
 
-    CommandArgumentEntry arg1;
-    CommandArgumentData file_arg_remote;
-
-    // Define the first (and only) variant of this arg.
-    file_arg_remote.arg_type = eArgTypeRemoteFilename;
-    file_arg_remote.arg_repetition = eArgRepeatPlain;
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(file_arg_remote);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeRemoteFilename);
   }
 
   ~CommandObjectPlatformGetPermissions() override = default;
@@ -980,18 +951,7 @@ public:
 
     Check if /the/remote/file/path exists on the remote end.)");
 
-    CommandArgumentEntry arg1;
-    CommandArgumentData file_arg_remote;
-
-    // Define the first (and only) variant of this arg.
-    file_arg_remote.arg_type = eArgTypeRemoteFilename;
-    file_arg_remote.arg_repetition = eArgRepeatPlain;
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(file_arg_remote);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeRemoteFilename);
   }
 
   ~CommandObjectPlatformFileExists() override = default;
@@ -1093,8 +1053,7 @@ public:
     m_all_options.Append(&m_class_options, LLDB_OPT_SET_1 | LLDB_OPT_SET_2,
                          LLDB_OPT_SET_ALL);
     m_all_options.Finalize();
-    CommandArgumentData run_arg_arg{eArgTypeRunArgs, eArgRepeatStar};
-    m_arguments.push_back({run_arg_arg});
+    AddSimpleArgumentList(eArgTypeRunArgs, eArgRepeatStar);
   }
 
   void
@@ -1503,19 +1462,7 @@ public:
             interpreter, "platform process info",
             "Get detailed information for one or more process by process ID.",
             "platform process info <pid> [<pid> <pid> ...]", 0) {
-    CommandArgumentEntry arg;
-    CommandArgumentData pid_args;
-
-    // Define the first (and only) variant of this arg.
-    pid_args.arg_type = eArgTypePid;
-    pid_args.arg_repetition = eArgRepeatStar;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(pid_args);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypePid, eArgRepeatStar);
   }
 
   ~CommandObjectPlatformProcessInfo() override = default;
@@ -1721,8 +1668,7 @@ public:
       : CommandObjectRaw(interpreter, "platform shell",
                          "Run a shell command on the current platform.",
                          "platform shell <shell-command>", 0) {
-    CommandArgumentData thread_arg{eArgTypeNone, eArgRepeatStar};
-    m_arguments.push_back({thread_arg});
+    AddSimpleArgumentList(eArgTypeNone, eArgRepeatStar);
   }
 
   ~CommandObjectPlatformShell() override = default;
diff --git a/lldb/source/Commands/CommandObjectPlugin.cpp b/lldb/source/Commands/CommandObjectPlugin.cpp
index da3b5f0..f3108b8 100644
--- a/lldb/source/Commands/CommandObjectPlugin.cpp
+++ b/lldb/source/Commands/CommandObjectPlugin.cpp
@@ -19,19 +19,7 @@ public:
       : CommandObjectParsed(interpreter, "plugin load",
                             "Import a dylib that implements an LLDB plugin.",
                             nullptr) {
-    CommandArgumentEntry arg1;
-    CommandArgumentData cmd_arg;
-
-    // Define the first (and only) variant of this arg.
-    cmd_arg.arg_type = eArgTypeFilename;
-    cmd_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(cmd_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeFilename);
   }
 
   ~CommandObjectPluginLoad() override = default;
diff --git a/lldb/source/Commands/CommandObjectProcess.cpp b/lldb/source/Commands/CommandObjectProcess.cpp
index 7cd5ad6..9ac97eb 100644
--- a/lldb/source/Commands/CommandObjectProcess.cpp
+++ b/lldb/source/Commands/CommandObjectProcess.cpp
@@ -126,19 +126,7 @@ public:
                          LLDB_OPT_SET_ALL);
     m_all_options.Finalize();
 
-    CommandArgumentEntry arg;
-    CommandArgumentData run_args_arg;
-
-    // Define the first (and only) variant of this arg.
-    run_args_arg.arg_type = eArgTypeRunArgs;
-    run_args_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(run_args_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeRunArgs, eArgRepeatOptional);
   }
 
   ~CommandObjectProcessLaunch() override = default;
@@ -870,8 +858,7 @@ public:
       : CommandObjectParsed(interpreter, "process connect",
                             "Connect to a remote debug service.",
                             "process connect <remote-url>", 0) {
-    CommandArgumentData connect_arg{eArgTypeConnectURL, eArgRepeatPlain};
-    m_arguments.push_back({connect_arg});
+    AddSimpleArgumentList(eArgTypeConnectURL);
   }
 
   ~CommandObjectProcessConnect() override = default;
@@ -996,8 +983,7 @@ public:
                             eCommandRequiresProcess | eCommandTryTargetAPILock |
                                 eCommandProcessMustBeLaunched |
                                 eCommandProcessMustBePaused) {
-    CommandArgumentData file_arg{eArgTypePath, eArgRepeatPlus};
-    m_arguments.push_back({file_arg});
+    AddSimpleArgumentList(eArgTypePath, eArgRepeatPlus);
   }
 
   ~CommandObjectProcessLoad() override = default;
@@ -1070,8 +1056,7 @@ public:
             "process unload <index>",
             eCommandRequiresProcess | eCommandTryTargetAPILock |
                 eCommandProcessMustBeLaunched | eCommandProcessMustBePaused) {
-    CommandArgumentData load_idx_arg{eArgTypeUnsignedInteger, eArgRepeatPlain};
-    m_arguments.push_back({load_idx_arg});
+    AddSimpleArgumentList(eArgTypeUnsignedInteger);
   }
 
   ~CommandObjectProcessUnload() override = default;
@@ -1131,19 +1116,7 @@ public:
             interpreter, "process signal",
             "Send a UNIX signal to the current target process.", nullptr,
             eCommandRequiresProcess | eCommandTryTargetAPILock) {
-    CommandArgumentEntry arg;
-    CommandArgumentData signal_arg;
-
-    // Define the first (and only) variant of this arg.
-    signal_arg.arg_type = eArgTypeUnixSignal;
-    signal_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(signal_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeUnixSignal);
   }
 
   ~CommandObjectProcessSignal() override = default;
@@ -1274,8 +1247,7 @@ public:
             "process save-core [-s corefile-style -p plugin-name] FILE",
             eCommandRequiresProcess | eCommandTryTargetAPILock |
                 eCommandProcessMustBeLaunched) {
-    CommandArgumentData file_arg{eArgTypePath, eArgRepeatPlain};
-    m_arguments.push_back({file_arg});
+    AddSimpleArgumentList(eArgTypePath);
   }
 
   ~CommandObjectProcessSaveCore() override = default;
@@ -1559,15 +1531,7 @@ public:
                 "by passing the -t option."
                 "\nYou can also clear the target modification for a signal"
                 "by passing the -c option");
-    CommandArgumentEntry arg;
-    CommandArgumentData signal_arg;
-
-    signal_arg.arg_type = eArgTypeUnixSignal;
-    signal_arg.arg_repetition = eArgRepeatStar;
-
-    arg.push_back(signal_arg);
-
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeUnixSignal, eArgRepeatStar);
   }
 
   ~CommandObjectProcessHandle() override = default;
diff --git a/lldb/source/Commands/CommandObjectQuit.cpp b/lldb/source/Commands/CommandObjectQuit.cpp
index d7caf15..8e7830b 100644
--- a/lldb/source/Commands/CommandObjectQuit.cpp
+++ b/lldb/source/Commands/CommandObjectQuit.cpp
@@ -21,8 +21,7 @@ using namespace lldb_private;
 CommandObjectQuit::CommandObjectQuit(CommandInterpreter &interpreter)
     : CommandObjectParsed(interpreter, "quit", "Quit the LLDB debugger.",
                           "quit [exit-code]") {
-  CommandArgumentData exit_code_arg{eArgTypeUnsignedInteger, eArgRepeatPlain};
-  m_arguments.push_back({exit_code_arg});
+  AddSimpleArgumentList(eArgTypeUnsignedInteger);
 }
 
 CommandObjectQuit::~CommandObjectQuit() = default;
diff --git a/lldb/source/Commands/CommandObjectRegister.cpp b/lldb/source/Commands/CommandObjectRegister.cpp
index 4ffdde1..4e047cc 100644
--- a/lldb/source/Commands/CommandObjectRegister.cpp
+++ b/lldb/source/Commands/CommandObjectRegister.cpp
@@ -50,19 +50,7 @@ public:
                          {{CommandArgumentType::eArgTypeFormat,
                            "Specify a format to be used for display. If this "
                            "is set, register fields will not be displayed."}}) {
-    CommandArgumentEntry arg;
-    CommandArgumentData register_arg;
-
-    // Define the first (and only) variant of this arg.
-    register_arg.arg_type = eArgTypeRegisterName;
-    register_arg.arg_repetition = eArgRepeatStar;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(register_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeRegisterName, eArgRepeatStar);
 
     // Add the "--format"
     m_option_group.Append(&m_format_options,
@@ -422,13 +410,7 @@ Fields      (*)  A table of the names and bit positions of the values contained
 Fields marked with (*) may not always be present. Some information may be
 different for the same register when connected to different debug servers.)");
 
-    CommandArgumentData register_arg;
-    register_arg.arg_type = eArgTypeRegisterName;
-    register_arg.arg_repetition = eArgRepeatPlain;
-
-    CommandArgumentEntry arg1;
-    arg1.push_back(register_arg);
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeRegisterName);
   }
 
   ~CommandObjectRegisterInfo() override = default;
diff --git a/lldb/source/Commands/CommandObjectSession.cpp b/lldb/source/Commands/CommandObjectSession.cpp
index 28506d6..c381ba4 100644
--- a/lldb/source/Commands/CommandObjectSession.cpp
+++ b/lldb/source/Commands/CommandObjectSession.cpp
@@ -21,9 +21,7 @@ public:
                             "If no file if specified, transcripts will be "
                             "saved to a temporary file.",
                             "session save [file]") {
-    CommandArgumentEntry arg1;
-    arg1.emplace_back(eArgTypePath, eArgRepeatOptional);
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypePath, eArgRepeatOptional);
   }
 
   ~CommandObjectSessionSave() override = default;
diff --git a/lldb/source/Commands/CommandObjectSettings.cpp b/lldb/source/Commands/CommandObjectSettings.cpp
index 0cf3d1d..7bbb0dd 100644
--- a/lldb/source/Commands/CommandObjectSettings.cpp
+++ b/lldb/source/Commands/CommandObjectSettings.cpp
@@ -245,19 +245,7 @@ public:
                             "Show matching debugger settings and their current "
                             "values.  Defaults to showing all settings.",
                             nullptr) {
-    CommandArgumentEntry arg1;
-    CommandArgumentData var_name_arg;
-
-    // Define the first (and only) variant of this arg.
-    var_name_arg.arg_type = eArgTypeSettingVariableName;
-    var_name_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(var_name_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeSettingVariableName, eArgRepeatOptional);
   }
 
   ~CommandObjectSettingsShow() override = default;
@@ -297,19 +285,7 @@ public:
             "current values to a file that can be read in with "
             "\"settings read\". Defaults to writing all settings.",
             nullptr) {
-    CommandArgumentEntry arg1;
-    CommandArgumentData var_name_arg;
-
-    // Define the first (and only) variant of this arg.
-    var_name_arg.arg_type = eArgTypeSettingVariableName;
-    var_name_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg1.push_back(var_name_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg1);
+    AddSimpleArgumentList(eArgTypeSettingVariableName, eArgRepeatOptional);
   }
 
   ~CommandObjectSettingsWrite() override = default;
@@ -997,19 +973,7 @@ public:
             interpreter, "settings clear",
             "Clear a debugger setting array, dictionary, or string. "
             "If '-a' option is specified, it clears all settings.", nullptr) {
-    CommandArgumentEntry arg;
-    CommandArgumentData var_name_arg;
-
-    // Define the first (and only) variant of this arg.
-    var_name_arg.arg_type = eArgTypeSettingVariableName;
-    var_name_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(var_name_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeSettingVariableName);
   }
 
   ~CommandObjectSettingsClear() override = default;
diff --git a/lldb/source/Commands/CommandObjectTarget.cpp b/lldb/source/Commands/CommandObjectTarget.cpp
index 4e006e4..4526557 100644
--- a/lldb/source/Commands/CommandObjectTarget.cpp
+++ b/lldb/source/Commands/CommandObjectTarget.cpp
@@ -229,19 +229,8 @@ public:
         m_remote_file(
             LLDB_OPT_SET_1, false, "remote-file", 'r', 0, eArgTypeFilename,
             "Fullpath to the file on the remote host if debugging remotely.") {
-    CommandArgumentEntry arg;
-    CommandArgumentData file_arg;
-
-    // Define the first (and only) variant of this arg.
-    file_arg.arg_type = eArgTypeFilename;
-    file_arg.arg_repetition = eArgRepeatPlain;
 
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(file_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeFilename);
 
     m_option_group.Append(&m_arch_option, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
     m_option_group.Append(&m_platform_options, LLDB_OPT_SET_ALL, 1);
@@ -503,8 +492,7 @@ public:
       : CommandObjectParsed(
             interpreter, "target select",
             "Select a target as the current target by target index.", nullptr) {
-    CommandArgumentData target_arg{eArgTypeTargetID, eArgRepeatPlain};
-    m_arguments.push_back({target_arg});
+    AddSimpleArgumentList(eArgTypeTargetID);
   }
 
   ~CommandObjectTargetSelect() override = default;
@@ -586,8 +574,7 @@ public:
     m_option_group.Append(&m_all_option, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
     m_option_group.Append(&m_cleanup_option, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
     m_option_group.Finalize();
-    CommandArgumentData target_arg{eArgTypeTargetID, eArgRepeatStar};
-    m_arguments.push_back({target_arg});
+    AddSimpleArgumentList(eArgTypeTargetID, eArgRepeatStar);
   }
 
   ~CommandObjectTargetDelete() override = default;
@@ -729,19 +716,7 @@ public:
             "A basename or fullpath to a shared library to use in the search "
             "for global "
             "variables. This option can be specified multiple times.") {
-    CommandArgumentEntry arg;
-    CommandArgumentData var_name_arg;
-
-    // Define the first (and only) variant of this arg.
-    var_name_arg.arg_type = eArgTypeVarName;
-    var_name_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(var_name_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeVarName, eArgRepeatPlus);
 
     m_option_group.Append(&m_varobj_options, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
     m_option_group.Append(&m_option_variable, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
@@ -1243,19 +1218,7 @@ public:
             interpreter, "target modules search-paths query",
             "Transform a path using the first applicable image search path.",
             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandArgumentData path_arg;
-
-    // Define the first (and only) variant of this arg.
-    path_arg.arg_type = eArgTypeDirectoryName;
-    path_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(path_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeDirectoryName);
   }
 
   ~CommandObjectTargetModulesSearchPathsQuery() override = default;
@@ -1881,19 +1844,7 @@ public:
                                                const char *syntax,
                                                uint32_t flags = 0)
       : CommandObjectParsed(interpreter, name, help, syntax, flags) {
-    CommandArgumentEntry arg;
-    CommandArgumentData file_arg;
-
-    // Define the first (and only) variant of this arg.
-    file_arg.arg_type = eArgTypeFilename;
-    file_arg.arg_repetition = eArgRepeatStar;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(file_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeFilename, eArgRepeatStar);
   }
 
   ~CommandObjectTargetModulesModuleAutoComplete() override = default;
@@ -1918,19 +1869,7 @@ public:
       CommandInterpreter &interpreter, const char *name, const char *help,
       const char *syntax, uint32_t flags)
       : CommandObjectParsed(interpreter, name, help, syntax, flags) {
-    CommandArgumentEntry arg;
-    CommandArgumentData source_file_arg;
-
-    // Define the first (and only) variant of this arg.
-    source_file_arg.arg_type = eArgTypeSourceFile;
-    source_file_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(source_file_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeSourceFile, eArgRepeatPlus);
   }
 
   ~CommandObjectTargetModulesSourceFileAutoComplete() override = default;
@@ -2234,8 +2173,7 @@ public:
             interpreter, "target modules dump pcm-info",
             "Dump information about the given clang module (pcm).") {
     // Take a single file argument.
-    CommandArgumentData arg{eArgTypeFilename, eArgRepeatPlain};
-    m_arguments.push_back({arg});
+    AddSimpleArgumentList(eArgTypeFilename);
   }
 
   ~CommandObjectTargetModulesDumpClangPCMInfo() override = default;
@@ -2774,8 +2712,7 @@ public:
                           LLDB_OPT_SET_1);
     m_option_group.Append(&m_symbol_file, LLDB_OPT_SET_ALL, LLDB_OPT_SET_1);
     m_option_group.Finalize();
-    CommandArgumentData module_arg{eArgTypePath, eArgRepeatStar};
-    m_arguments.push_back({module_arg});
+    AddSimpleArgumentList(eArgTypePath, eArgRepeatStar);
   }
 
   ~CommandObjectTargetModulesAdd() override = default;
@@ -3219,8 +3156,7 @@ public:
       : CommandObjectParsed(
             interpreter, "target modules list",
             "List current executable and dependent shared library images.") {
-    CommandArgumentData module_arg{eArgTypeModule, eArgRepeatStar};
-    m_arguments.push_back({module_arg});
+    AddSimpleArgumentList(eArgTypeModule, eArgRepeatStar);
   }
 
   ~CommandObjectTargetModulesList() override = default;
@@ -3992,19 +3928,7 @@ public:
                             "Look up information within executable and "
                             "dependent shared library images.",
                             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandArgumentData file_arg;
-
-    // Define the first (and only) variant of this arg.
-    file_arg.arg_type = eArgTypeFilename;
-    file_arg.arg_repetition = eArgRepeatStar;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(file_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeFilename, eArgRepeatStar);
   }
 
   ~CommandObjectTargetModulesLookup() override = default;
@@ -4323,8 +4247,7 @@ public:
     m_option_group.Append(&m_current_stack_option, LLDB_OPT_SET_2,
                           LLDB_OPT_SET_2);
     m_option_group.Finalize();
-    CommandArgumentData module_arg{eArgTypeShlibName, eArgRepeatPlain};
-    m_arguments.push_back({module_arg});
+    AddSimpleArgumentList(eArgTypeShlibName);
   }
 
   ~CommandObjectTargetSymbolsAdd() override = default;
@@ -5163,8 +5086,7 @@ public:
       : CommandObjectParsed(interpreter, "target stop-hook delete",
                             "Delete a stop-hook.",
                             "target stop-hook delete [<idx>]") {
-    CommandArgumentData hook_arg{eArgTypeStopHookID, eArgRepeatStar};
-    m_arguments.push_back({hook_arg});
+    AddSimpleArgumentList(eArgTypeStopHookID, eArgRepeatStar);
   }
 
   ~CommandObjectTargetStopHookDelete() override = default;
@@ -5218,8 +5140,7 @@ public:
                                            bool enable, const char *name,
                                            const char *help, const char *syntax)
       : CommandObjectParsed(interpreter, name, help, syntax), m_enable(enable) {
-    CommandArgumentData hook_arg{eArgTypeStopHookID, eArgRepeatStar};
-    m_arguments.push_back({hook_arg});
+    AddSimpleArgumentList(eArgTypeStopHookID, eArgRepeatStar);
   }
 
   ~CommandObjectTargetStopHookEnableDisable() override = default;
diff --git a/lldb/source/Commands/CommandObjectThread.cpp b/lldb/source/Commands/CommandObjectThread.cpp
index 52e493b..9cfff05 100644
--- a/lldb/source/Commands/CommandObjectThread.cpp
+++ b/lldb/source/Commands/CommandObjectThread.cpp
@@ -374,19 +374,7 @@ public:
                                 eCommandProcessMustBePaused),
         m_step_type(step_type), m_step_scope(step_scope),
         m_class_options("scripted step") {
-    CommandArgumentEntry arg;
-    CommandArgumentData thread_id_arg;
-
-    // Define the first (and only) variant of this arg.
-    thread_id_arg.arg_type = eArgTypeThreadID;
-    thread_id_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(thread_id_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeThreadID, eArgRepeatOptional);
 
     if (step_type == eStepTypeScripted) {
       m_all_options.Append(&m_class_options, LLDB_OPT_SET_1 | LLDB_OPT_SET_2,
@@ -643,19 +631,7 @@ public:
             nullptr,
             eCommandRequiresThread | eCommandTryTargetAPILock |
                 eCommandProcessMustBeLaunched | eCommandProcessMustBePaused) {
-    CommandArgumentEntry arg;
-    CommandArgumentData thread_idx_arg;
-
-    // Define the first (and only) variant of this arg.
-    thread_idx_arg.arg_type = eArgTypeThreadIndex;
-    thread_idx_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(thread_idx_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeThreadIndex, eArgRepeatPlus);
   }
 
   ~CommandObjectThreadContinue() override = default;
@@ -886,19 +862,7 @@ public:
             nullptr,
             eCommandRequiresThread | eCommandTryTargetAPILock |
                 eCommandProcessMustBeLaunched | eCommandProcessMustBePaused) {
-    CommandArgumentEntry arg;
-    CommandArgumentData line_num_arg;
-
-    // Define the first (and only) variant of this arg.
-    line_num_arg.arg_type = eArgTypeLineNum;
-    line_num_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(line_num_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeLineNum);
   }
 
   ~CommandObjectThreadUntil() override = default;
@@ -1539,19 +1503,7 @@ public:
                          eCommandRequiresFrame | eCommandTryTargetAPILock |
                              eCommandProcessMustBeLaunched |
                              eCommandProcessMustBePaused) {
-    CommandArgumentEntry arg;
-    CommandArgumentData expression_arg;
-
-    // Define the first (and only) variant of this arg.
-    expression_arg.arg_type = eArgTypeExpression;
-    expression_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(expression_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeExpression, eArgRepeatOptional);
   }
 
   ~CommandObjectThreadReturn() override = default;
@@ -1919,19 +1871,7 @@ public:
                                 eCommandTryTargetAPILock |
                                 eCommandProcessMustBeLaunched |
                                 eCommandProcessMustBePaused) {
-    CommandArgumentEntry arg;
-    CommandArgumentData plan_index_arg;
-
-    // Define the first (and only) variant of this arg.
-    plan_index_arg.arg_type = eArgTypeUnsignedInteger;
-    plan_index_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(plan_index_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeUnsignedInteger);
   }
 
   ~CommandObjectThreadPlanDiscard() override = default;
@@ -1992,19 +1932,7 @@ public:
                                 eCommandTryTargetAPILock |
                                 eCommandProcessMustBeLaunched |
                                 eCommandProcessMustBePaused) {
-    CommandArgumentEntry arg;
-    CommandArgumentData tid_arg;
-
-    // Define the first (and only) variant of this arg.
-    tid_arg.arg_type = eArgTypeThreadID;
-    tid_arg.arg_repetition = eArgRepeatStar;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(tid_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeThreadID, eArgRepeatStar);
   }
 
   ~CommandObjectThreadPlanPrune() override = default;
@@ -2221,8 +2149,7 @@ public:
             eCommandRequiresProcess | eCommandRequiresThread |
                 eCommandTryTargetAPILock | eCommandProcessMustBeLaunched |
                 eCommandProcessMustBePaused | eCommandProcessMustBeTraced) {
-    CommandArgumentData thread_arg{eArgTypeThreadIndex, eArgRepeatOptional};
-    m_arguments.push_back({thread_arg});
+    AddSimpleArgumentList(eArgTypeThreadIndex, eArgRepeatOptional);
   }
 
   ~CommandObjectTraceDumpFunctionCalls() override = default;
@@ -2395,8 +2322,7 @@ public:
             eCommandRequiresProcess | eCommandRequiresThread |
                 eCommandTryTargetAPILock | eCommandProcessMustBeLaunched |
                 eCommandProcessMustBePaused | eCommandProcessMustBeTraced) {
-    CommandArgumentData thread_arg{eArgTypeThreadIndex, eArgRepeatOptional};
-    m_arguments.push_back({thread_arg});
+    AddSimpleArgumentList(eArgTypeThreadIndex, eArgRepeatOptional);
   }
 
   ~CommandObjectTraceDumpInstructions() override = default;
diff --git a/lldb/source/Commands/CommandObjectThreadUtil.cpp b/lldb/source/Commands/CommandObjectThreadUtil.cpp
index d7fa419..cdc5946 100644
--- a/lldb/source/Commands/CommandObjectThreadUtil.cpp
+++ b/lldb/source/Commands/CommandObjectThreadUtil.cpp
@@ -21,8 +21,7 @@ CommandObjectIterateOverThreads::CommandObjectIterateOverThreads(
     const char *syntax, uint32_t flags)
     : CommandObjectParsed(interpreter, name, help, syntax, flags) {
   // These commands all take thread ID's as arguments.
-  CommandArgumentData thread_arg{eArgTypeThreadIndex, eArgRepeatStar};
-  m_arguments.push_back({thread_arg});
+  AddSimpleArgumentList(eArgTypeThreadIndex, eArgRepeatStar);
 }
 
 CommandObjectMultipleThreads::CommandObjectMultipleThreads(
@@ -30,8 +29,7 @@ CommandObjectMultipleThreads::CommandObjectMultipleThreads(
     const char *syntax, uint32_t flags)
     : CommandObjectParsed(interpreter, name, help, syntax, flags) {
   // These commands all take thread ID's as arguments.
-  CommandArgumentData thread_arg{eArgTypeThreadIndex, eArgRepeatStar};
-  m_arguments.push_back({thread_arg});
+  AddSimpleArgumentList(eArgTypeThreadIndex, eArgRepeatStar);
 }
 
 void CommandObjectIterateOverThreads::DoExecute(Args &command,
diff --git a/lldb/source/Commands/CommandObjectTrace.cpp b/lldb/source/Commands/CommandObjectTrace.cpp
index e0c74e2..5bcbc23 100644
--- a/lldb/source/Commands/CommandObjectTrace.cpp
+++ b/lldb/source/Commands/CommandObjectTrace.cpp
@@ -89,8 +89,7 @@ public:
             eCommandRequiresProcess | eCommandTryTargetAPILock |
                 eCommandProcessMustBeLaunched | eCommandProcessMustBePaused |
                 eCommandProcessMustBeTraced) {
-    CommandArgumentData bundle_dir{eArgTypeDirectoryName, eArgRepeatPlain};
-    m_arguments.push_back({bundle_dir});
+    AddSimpleArgumentList(eArgTypeDirectoryName);
   }
 
   void
@@ -176,8 +175,7 @@ public:
             interpreter, "trace load",
             "Load a post-mortem processor trace session from a trace bundle.",
             "trace load <trace_description_file>") {
-    CommandArgumentData session_file_arg{eArgTypeFilename, eArgRepeatPlain};
-    m_arguments.push_back({session_file_arg});
+    AddSimpleArgumentList(eArgTypeFilename);
   }
 
   void
@@ -332,8 +330,7 @@ public:
                             "Show the schema of the given trace plugin.",
                             "trace schema <plug-in>. Use the plug-in name "
                             "\"all\" to see all schemas.\n") {
-    CommandArgumentData plugin_arg{eArgTypeNone, eArgRepeatPlain};
-    m_arguments.push_back({plugin_arg});
+    AddSimpleArgumentList(eArgTypeNone);
   }
 
   ~CommandObjectTraceSchema() override = default;
diff --git a/lldb/source/Commands/CommandObjectType.cpp b/lldb/source/Commands/CommandObjectType.cpp
index 036b8e9..97489bd 100644
--- a/lldb/source/Commands/CommandObjectType.cpp
+++ b/lldb/source/Commands/CommandObjectType.cpp
@@ -589,15 +589,7 @@ public:
       : CommandObjectParsed(interpreter, "type format add",
                             "Add a new formatting style for a type.", nullptr),
         m_format_options(eFormatInvalid) {
-    CommandArgumentEntry type_arg;
-    CommandArgumentData type_style_arg;
-
-    type_style_arg.arg_type = eArgTypeName;
-    type_style_arg.arg_repetition = eArgRepeatPlus;
-
-    type_arg.push_back(type_style_arg);
-
-    m_arguments.push_back(type_arg);
+    AddSimpleArgumentList(eArgTypeName, eArgRepeatPlus);
 
     SetHelpLong(
         R"(
@@ -784,15 +776,7 @@ public:
       : CommandObjectParsed(interpreter,
                             FormatCategoryToString(formatter_kind, false)),
         m_formatter_kind(formatter_kind) {
-    CommandArgumentEntry type_arg;
-    CommandArgumentData type_style_arg;
-
-    type_style_arg.arg_type = eArgTypeName;
-    type_style_arg.arg_repetition = eArgRepeatPlain;
-
-    type_arg.push_back(type_style_arg);
-
-    m_arguments.push_back(type_arg);
+    AddSimpleArgumentList(eArgTypeName);
 
     const char *kind = FormatCategoryToString(formatter_kind, true);
     const char *short_kind = FormatCategoryToString(formatter_kind, false);
@@ -929,8 +913,7 @@ public:
                                   const char *name, const char *help)
       : CommandObjectParsed(interpreter, name, help, nullptr),
         m_formatter_kind(formatter_kind) {
-    CommandArgumentData category_arg{eArgTypeName, eArgRepeatOptional};
-    m_arguments.push_back({category_arg});
+    AddSimpleArgumentList(eArgTypeName, eArgRepeatOptional);
   }
 
   ~CommandObjectTypeFormatterClear() override = default;
@@ -1045,15 +1028,7 @@ public:
   CommandObjectTypeFormatterList(CommandInterpreter &interpreter,
                                  const char *name, const char *help)
       : CommandObjectParsed(interpreter, name, help, nullptr), m_options() {
-    CommandArgumentEntry type_arg;
-    CommandArgumentData type_style_arg;
-
-    type_style_arg.arg_type = eArgTypeName;
-    type_style_arg.arg_repetition = eArgRepeatOptional;
-
-    type_arg.push_back(type_style_arg);
-
-    m_arguments.push_back(type_arg);
+    AddSimpleArgumentList(eArgTypeName, eArgRepeatOptional);
   }
 
   ~CommandObjectTypeFormatterList() override = default;
@@ -1445,15 +1420,7 @@ CommandObjectTypeSummaryAdd::CommandObjectTypeSummaryAdd(
     : CommandObjectParsed(interpreter, "type summary add",
                           "Add a new summary style for a type.", nullptr),
       IOHandlerDelegateMultiline("DONE"), m_options(interpreter) {
-  CommandArgumentEntry type_arg;
-  CommandArgumentData type_style_arg;
-
-  type_style_arg.arg_type = eArgTypeName;
-  type_style_arg.arg_repetition = eArgRepeatPlus;
-
-  type_arg.push_back(type_style_arg);
-
-  m_arguments.push_back(type_arg);
+  AddSimpleArgumentList(eArgTypeName, eArgRepeatPlus);
 
   SetHelpLong(
       R"(
@@ -1745,15 +1712,7 @@ public:
       : CommandObjectParsed(interpreter, "type category define",
                             "Define a new category as a source of formatters.",
                             nullptr) {
-    CommandArgumentEntry type_arg;
-    CommandArgumentData type_style_arg;
-
-    type_style_arg.arg_type = eArgTypeName;
-    type_style_arg.arg_repetition = eArgRepeatPlus;
-
-    type_arg.push_back(type_style_arg);
-
-    m_arguments.push_back(type_arg);
+    AddSimpleArgumentList(eArgTypeName, eArgRepeatPlus);
   }
 
   ~CommandObjectTypeCategoryDefine() override = default;
@@ -1838,15 +1797,7 @@ public:
       : CommandObjectParsed(interpreter, "type category enable",
                             "Enable a category as a source of formatters.",
                             nullptr) {
-    CommandArgumentEntry type_arg;
-    CommandArgumentData type_style_arg;
-
-    type_style_arg.arg_type = eArgTypeName;
-    type_style_arg.arg_repetition = eArgRepeatPlus;
-
-    type_arg.push_back(type_style_arg);
-
-    m_arguments.push_back(type_arg);
+    AddSimpleArgumentList(eArgTypeName, eArgRepeatPlus);
   }
 
   ~CommandObjectTypeCategoryEnable() override = default;
@@ -1897,15 +1848,7 @@ public:
       : CommandObjectParsed(interpreter, "type category delete",
                             "Delete a category and all associated formatters.",
                             nullptr) {
-    CommandArgumentEntry type_arg;
-    CommandArgumentData type_style_arg;
-
-    type_style_arg.arg_type = eArgTypeName;
-    type_style_arg.arg_repetition = eArgRepeatPlus;
-
-    type_arg.push_back(type_style_arg);
-
-    m_arguments.push_back(type_arg);
+    AddSimpleArgumentList(eArgTypeName, eArgRepeatPlus);
   }
 
   ~CommandObjectTypeCategoryDelete() override = default;
@@ -1996,15 +1939,7 @@ public:
       : CommandObjectParsed(interpreter, "type category disable",
                             "Disable a category as a source of formatters.",
                             nullptr) {
-    CommandArgumentEntry type_arg;
-    CommandArgumentData type_style_arg;
-
-    type_style_arg.arg_type = eArgTypeName;
-    type_style_arg.arg_repetition = eArgRepeatPlus;
-
-    type_arg.push_back(type_style_arg);
-
-    m_arguments.push_back(type_arg);
+    AddSimpleArgumentList(eArgTypeName, eArgRepeatPlus);
   }
 
   ~CommandObjectTypeCategoryDisable() override = default;
@@ -2050,15 +1985,7 @@ public:
       : CommandObjectParsed(interpreter, "type category list",
                             "Provide a list of all existing categories.",
                             nullptr) {
-    CommandArgumentEntry type_arg;
-    CommandArgumentData type_style_arg;
-
-    type_style_arg.arg_type = eArgTypeName;
-    type_style_arg.arg_repetition = eArgRepeatOptional;
-
-    type_arg.push_back(type_style_arg);
-
-    m_arguments.push_back(type_arg);
+    AddSimpleArgumentList(eArgTypeName, eArgRepeatOptional);
   }
 
   ~CommandObjectTypeCategoryList() override = default;
@@ -2271,15 +2198,7 @@ CommandObjectTypeSynthAdd::CommandObjectTypeSynthAdd(
     : CommandObjectParsed(interpreter, "type synthetic add",
                           "Add a new synthetic provider for a type.", nullptr),
       IOHandlerDelegateMultiline("DONE"), m_options() {
-  CommandArgumentEntry type_arg;
-  CommandArgumentData type_style_arg;
-
-  type_style_arg.arg_type = eArgTypeName;
-  type_style_arg.arg_repetition = eArgRepeatPlus;
-
-  type_arg.push_back(type_style_arg);
-
-  m_arguments.push_back(type_arg);
+  AddSimpleArgumentList(eArgTypeName, eArgRepeatPlus);
 }
 
 bool CommandObjectTypeSynthAdd::AddSynth(ConstString type_name,
@@ -2476,15 +2395,7 @@ public:
   CommandObjectTypeFilterAdd(CommandInterpreter &interpreter)
       : CommandObjectParsed(interpreter, "type filter add",
                             "Add a new filter for a type.", nullptr) {
-    CommandArgumentEntry type_arg;
-    CommandArgumentData type_style_arg;
-
-    type_style_arg.arg_type = eArgTypeName;
-    type_style_arg.arg_repetition = eArgRepeatPlus;
-
-    type_arg.push_back(type_style_arg);
-
-    m_arguments.push_back(type_arg);
+    AddSimpleArgumentList(eArgTypeName, eArgRepeatPlus);
 
     SetHelpLong(
         R"(
diff --git a/lldb/source/Commands/CommandObjectWatchpoint.cpp b/lldb/source/Commands/CommandObjectWatchpoint.cpp
index 5b74b1a..f123211 100644
--- a/lldb/source/Commands/CommandObjectWatchpoint.cpp
+++ b/lldb/source/Commands/CommandObjectWatchpoint.cpp
@@ -153,12 +153,7 @@ public:
             interpreter, "watchpoint list",
             "List all watchpoints at configurable levels of detail.", nullptr,
             eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeWatchpointID,
-                                      eArgTypeWatchpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eWatchpointArgs);
   }
 
   ~CommandObjectWatchpointList() override = default;
@@ -276,12 +271,7 @@ public:
                             "Enable the specified disabled watchpoint(s). If "
                             "no watchpoints are specified, enable all of them.",
                             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeWatchpointID,
-                                      eArgTypeWatchpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eWatchpointArgs);
   }
 
   ~CommandObjectWatchpointEnable() override = default;
@@ -350,12 +340,7 @@ public:
                             "removing it/them.  If no watchpoints are "
                             "specified, disable them all.",
                             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeWatchpointID,
-                                      eArgTypeWatchpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eWatchpointArgs);
   }
 
   ~CommandObjectWatchpointDisable() override = default;
@@ -429,12 +414,7 @@ public:
                             "Delete the specified watchpoint(s).  If no "
                             "watchpoints are specified, delete them all.",
                             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeWatchpointID,
-                                      eArgTypeWatchpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eWatchpointArgs);
   }
 
   ~CommandObjectWatchpointDelete() override = default;
@@ -550,12 +530,7 @@ public:
                             "Set ignore count on the specified watchpoint(s).  "
                             "If no watchpoints are specified, set them all.",
                             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeWatchpointID,
-                                      eArgTypeWatchpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eWatchpointArgs);
   }
 
   ~CommandObjectWatchpointIgnore() override = default;
@@ -673,12 +648,7 @@ public:
             "watchpoint.  "
             "Passing an empty argument clears the modification.",
             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandObject::AddIDsArgumentData(arg, eArgTypeWatchpointID,
-                                      eArgTypeWatchpointIDRange);
-    // Add the entry for the first argument for this command to the object's
-    // arguments vector.
-    m_arguments.push_back(arg);
+    CommandObject::AddIDsArgumentData(eWatchpointArgs);
   }
 
   ~CommandObjectWatchpointModify() override = default;
@@ -811,18 +781,7 @@ Examples:
         "    Watches my_global_var for read/write access, with the region to watch \
 corresponding to the byte size of the data type.");
 
-    CommandArgumentEntry arg;
-    CommandArgumentData var_name_arg;
-
-    // Define the only variant of this arg.
-    var_name_arg.arg_type = eArgTypeVarName;
-    var_name_arg.arg_repetition = eArgRepeatPlain;
-
-    // Push the variant into the argument entry.
-    arg.push_back(var_name_arg);
-
-    // Push the data for the only argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeVarName);
 
     // Absorb the '-w' and '-s' options into our option group.
     m_option_group.Append(&m_option_watchpoint, LLDB_OPT_SET_1, LLDB_OPT_SET_1);
@@ -1009,18 +968,7 @@ Examples:
 
     Watches write access for the 1-byte region pointed to by the address 'foo + 32')");
 
-    CommandArgumentEntry arg;
-    CommandArgumentData expression_arg;
-
-    // Define the only variant of this arg.
-    expression_arg.arg_type = eArgTypeExpression;
-    expression_arg.arg_repetition = eArgRepeatPlain;
-
-    // Push the only variant into the argument entry.
-    arg.push_back(expression_arg);
-
-    // Push the data for the only argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeExpression);
 
     // Absorb the '-w' and '-s' options into our option group.
     m_option_group.Append(&m_option_watchpoint, LLDB_OPT_SET_ALL,
diff --git a/lldb/source/Commands/CommandObjectWatchpointCommand.cpp b/lldb/source/Commands/CommandObjectWatchpointCommand.cpp
index b1629ce..aaf1454 100644
--- a/lldb/source/Commands/CommandObjectWatchpointCommand.cpp
+++ b/lldb/source/Commands/CommandObjectWatchpointCommand.cpp
@@ -162,19 +162,7 @@ initialized:"
         "Final Note: A warning that no watchpoint command was generated when there \
 are no syntax errors may indicate that a function was declared but never called.");
 
-    CommandArgumentEntry arg;
-    CommandArgumentData wp_id_arg;
-
-    // Define the first (and only) variant of this arg.
-    wp_id_arg.arg_type = eArgTypeWatchpointID;
-    wp_id_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(wp_id_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeWatchpointID);
   }
 
   ~CommandObjectWatchpointCommandAdd() override = default;
@@ -455,19 +443,7 @@ public:
       : CommandObjectParsed(interpreter, "delete",
                             "Delete the set of commands from a watchpoint.",
                             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandArgumentData wp_id_arg;
-
-    // Define the first (and only) variant of this arg.
-    wp_id_arg.arg_type = eArgTypeWatchpointID;
-    wp_id_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(wp_id_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeWatchpointID);
   }
 
   ~CommandObjectWatchpointCommandDelete() override = default;
@@ -522,19 +498,7 @@ public:
                             "List the script or set of commands to be executed "
                             "when the watchpoint is hit.",
                             nullptr, eCommandRequiresTarget) {
-    CommandArgumentEntry arg;
-    CommandArgumentData wp_id_arg;
-
-    // Define the first (and only) variant of this arg.
-    wp_id_arg.arg_type = eArgTypeWatchpointID;
-    wp_id_arg.arg_repetition = eArgRepeatPlain;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(wp_id_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeWatchpointID);
   }
 
   ~CommandObjectWatchpointCommandList() override = default;
diff --git a/lldb/source/Interpreter/CommandObject.cpp b/lldb/source/Interpreter/CommandObject.cpp
index 93c53e8..4634b75 100644
--- a/lldb/source/Interpreter/CommandObject.cpp
+++ b/lldb/source/Interpreter/CommandObject.cpp
@@ -392,6 +392,24 @@ bool CommandObject::ParseOptionsAndNotify(Args &args,
   return true;
 }
 
+void CommandObject::AddSimpleArgumentList(
+    CommandArgumentType arg_type, ArgumentRepetitionType repetition_type) {
+
+  CommandArgumentEntry arg_entry;
+  CommandArgumentData simple_arg;
+
+  // Define the first (and only) variant of this arg.
+  simple_arg.arg_type = arg_type;
+  simple_arg.arg_repetition = repetition_type;
+
+  // There is only one variant this argument could be; put it into the argument
+  // entry.
+  arg_entry.push_back(simple_arg);
+
+  // Push the data for the first argument into the m_arguments vector.
+  m_arguments.push_back(arg_entry);
+}
+
 int CommandObject::GetNumArgumentEntries() { return m_arguments.size(); }
 
 CommandObject::CommandArgumentEntry *
@@ -694,20 +712,24 @@ void CommandObject::GenerateHelpText(Stream &output_strm) {
   }
 }
 
-void CommandObject::AddIDsArgumentData(CommandArgumentEntry &arg,
-                                       CommandArgumentType ID,
-                                       CommandArgumentType IDRange) {
+void CommandObject::AddIDsArgumentData(CommandObject::IDType type) {
+  CommandArgumentEntry arg;
   CommandArgumentData id_arg;
   CommandArgumentData id_range_arg;
 
   // Create the first variant for the first (and only) argument for this
   // command.
-  id_arg.arg_type = ID;
+  switch (type) {
+  case eBreakpointArgs:
+    id_arg.arg_type = eArgTypeBreakpointID;
+    id_range_arg.arg_type = eArgTypeBreakpointIDRange;
+    break;
+  case eWatchpointArgs:
+    id_arg.arg_type = eArgTypeWatchpointID;
+    id_range_arg.arg_type = eArgTypeWatchpointIDRange;
+    break;
+  }
   id_arg.arg_repetition = eArgRepeatOptional;
-
-  // Create the second variant for the first (and only) argument for this
-  // command.
-  id_range_arg.arg_type = IDRange;
   id_range_arg.arg_repetition = eArgRepeatOptional;
 
   // The first (and only) argument for this command could be either an id or an
@@ -715,6 +737,7 @@ void CommandObject::AddIDsArgumentData(CommandArgumentEntry &arg,
   // this command.
   arg.push_back(id_arg);
   arg.push_back(id_range_arg);
+  m_arguments.push_back(arg);
 }
 
 const char *CommandObject::GetArgumentTypeAsCString(
diff --git a/lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp b/lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp
index 47b1db1..7af768a 100644
--- a/lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.cpp
@@ -419,19 +419,7 @@ public:
       : CommandObjectParsed(
             interpreter, "demangle", "Demangle a C++ mangled name.",
             "language cplusplus demangle [<mangled-name> ...]") {
-    CommandArgumentEntry arg;
-    CommandArgumentData index_arg;
-
-    // Define the first (and only) variant of this arg.
-    index_arg.arg_type = eArgTypeSymbol;
-    index_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(index_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeSymbol, eArgRepeatPlus);
   }
 
   ~CommandObjectMultiwordItaniumABI_Demangle() override = default;
diff --git a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
index f380d6e..3e5ee6f 100644
--- a/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
+++ b/lldb/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCRuntimeV2.cpp
@@ -897,19 +897,7 @@ public:
                                 eCommandProcessMustBeLaunched |
                                 eCommandProcessMustBePaused),
         m_options() {
-    CommandArgumentEntry arg;
-    CommandArgumentData index_arg;
-
-    // Define the first (and only) variant of this arg.
-    index_arg.arg_type = eArgTypeRegularExpression;
-    index_arg.arg_repetition = eArgRepeatOptional;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(index_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeRegularExpression, eArgRepeatOptional);
   }
 
   ~CommandObjectObjC_ClassTable_Dump() override = default;
@@ -1015,19 +1003,7 @@ public:
             "language objc tagged-pointer info",
             eCommandRequiresProcess | eCommandProcessMustBeLaunched |
                 eCommandProcessMustBePaused) {
-    CommandArgumentEntry arg;
-    CommandArgumentData index_arg;
-
-    // Define the first (and only) variant of this arg.
-    index_arg.arg_type = eArgTypeAddress;
-    index_arg.arg_repetition = eArgRepeatPlus;
-
-    // There is only one variant this argument could be; put it into the
-    // argument entry.
-    arg.push_back(index_arg);
-
-    // Push the data for the first argument into the m_arguments vector.
-    m_arguments.push_back(arg);
+    AddSimpleArgumentList(eArgTypeAddress, eArgRepeatPlus);
   }
 
   ~CommandObjectMultiwordObjC_TaggedPointer_Info() override = default;
diff --git a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
index 3dc40ee..51ceb12 100644
--- a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
@@ -5354,8 +5354,7 @@ public:
             interpreter, "process plugin packet xfer-size",
             "Maximum size that lldb will try to read/write one one chunk.",
             nullptr) {
-    CommandArgumentData max_arg{eArgTypeUnsignedInteger, eArgRepeatPlain};
-    m_arguments.push_back({max_arg});
+    AddSimpleArgumentList(eArgTypeUnsignedInteger);
   }
 
   ~CommandObjectProcessGDBRemotePacketXferSize() override = default;
@@ -5397,8 +5396,7 @@ public:
                             "be added to the packet prior to sending and "
                             "stripped from the result.",
                             nullptr) {
-    CommandArgumentData packet_arg{eArgTypeNone, eArgRepeatStar};
-    m_arguments.push_back({packet_arg});
+    AddSimpleArgumentList(eArgTypeNone, eArgRepeatStar);
   }
 
   ~CommandObjectProcessGDBRemotePacketSend() override = default;