text: //===-- CommandObjectBreakpointCommand.cpp ----------------------*- C++ -*-===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  #include "CommandObjectBreakpointCommand.h"
  #include "CommandObjectBreakpoint.h"
  #include "lldb/Breakpoint/Breakpoint.h"
  #include "lldb/Breakpoint/BreakpointIDList.h"
  #include "lldb/Breakpoint/BreakpointLocation.h"
  #include "lldb/Breakpoint/StoppointCallbackContext.h"
  #include "lldb/Core/IOHandler.h"
  #include "lldb/Host/OptionParser.h"
  #include "lldb/Interpreter/CommandInterpreter.h"
  #include "lldb/Interpreter/CommandReturnObject.h"
  #include "lldb/Interpreter/OptionArgParser.h"
  #include "lldb/Target/Target.h"
  #include "lldb/Target/Thread.h"
  #include "lldb/Utility/State.h"
  
  #include "llvm/ADT/STLExtras.h"
  
  using namespace lldb;
  using namespace lldb_private;
  
  //-------------------------------------------------------------------------
  // CommandObjectBreakpointCommandAdd
  //-------------------------------------------------------------------------
  
  // FIXME: "script-type" needs to have its contents determined dynamically, so
  // somebody can add a new scripting
  // language to lldb and have it pickable here without having to change this
  // enumeration by hand and rebuild lldb proper.
  
  static constexpr OptionEnumValueElement g_script_option_enumeration[] = {
      {eScriptLanguageNone, "command",
       "Commands are in the lldb command interpreter language"},
      {eScriptLanguagePython, "python", "Commands are in the Python language."},
      {eSortOrderByName, "default-script",
       "Commands are in the default scripting language."} };
  
  static constexpr OptionEnumValues ScriptOptionEnum() {
    return OptionEnumValues(g_script_option_enumeration);
  }
  
  static constexpr OptionDefinition g_breakpoint_add_options[] = {
      // clang-format off
    { LLDB_OPT_SET_1,   false, "one-liner",         'o', OptionParser::eRequiredArgument, nullptr, {},                 0, eArgTypeOneLiner,       "Specify a one-line breakpoint command inline. Be sure to surround it with quotes." },
    { LLDB_OPT_SET_ALL, false, "stop-on-error",     'e', OptionParser::eRequiredArgument, nullptr, {},                 0, eArgTypeBoolean,        "Specify whether breakpoint command execution should terminate on error." },
    { LLDB_OPT_SET_ALL, false, "script-type",       's', OptionParser::eRequiredArgument, nullptr, ScriptOptionEnum(), 0, eArgTypeNone,           "Specify the language for the commands - if none is specified, the lldb command interpreter will be used." },
    { LLDB_OPT_SET_2,   false, "python-function",   'F', OptionParser::eRequiredArgument, nullptr, {},                 0, eArgTypePythonFunction, "Give the name of a Python function to run as command for this breakpoint. Be sure to give a module name if appropriate." },
    { LLDB_OPT_SET_ALL, false, "dummy-breakpoints", 'D', OptionParser::eNoArgument,       nullptr, {},                 0, eArgTypeNone,           "Sets Dummy breakpoints - i.e. breakpoints set before a file is provided, which prime new targets." },
      // clang-format on
  };
  
  class CommandObjectBreakpointCommandAdd : public CommandObjectParsed,
                                            public IOHandlerDelegateMultiline {
  public:
    CommandObjectBreakpointCommandAdd(CommandInterpreter &interpreter)
        : CommandObjectParsed(interpreter, "add",
                              "Add LLDB commands to a breakpoint, to be executed "
                              "whenever the breakpoint is hit."
                              "  If no breakpoint is specified, adds the "
                              "commands to the last created breakpoint.",
                              nullptr),
          IOHandlerDelegateMultiline("DONE",
                                     IOHandlerDelegate::Completion::LLDBCommand),
          m_options() {
      SetHelpLong(
          R"(
  General information about entering breakpoint commands
  ------------------------------------------------------
  
  )"
          "This command will prompt for commands to be executed when the specified \
  breakpoint is hit.  Each command is typed on its own line following the '> ' \
  prompt until 'DONE' is entered."
          R"(
  
  )"
          "Syntactic errors may not be detected when initially entered, and many \
  malformed commands can silently fail when executed.  If your breakpoint commands \
  do not appear to be executing, double-check the command syntax."
          R"(
  
  )"
          "Note: You may enter any debugger command exactly as you would at the debugger \
  prompt.  There is no limit to the number of commands supplied, but do NOT enter \
  more than one command per line."
          R"(
  
  Special information about PYTHON breakpoint commands
  ----------------------------------------------------
  
  )"
          "You may enter either one or more lines of Python, including function \
  definitions or calls to functions that will have been imported by the time \
  the code executes.  Single line breakpoint commands will be interpreted 'as is' \
  when the breakpoint is hit.  Multiple lines of Python will be wrapped in a \
  generated function, and a call to the function will be attached to the breakpoint."
          R"(
  
  This auto-generated function is passed in three arguments:
  
      frame:  an lldb.SBFrame object for the frame which hit breakpoint.
  
      bp_loc: an lldb.SBBreakpointLocation object that represents the breakpoint location that was hit.
  
      dict:   the python session dictionary hit.
  
  )"
          "When specifying a python function with the --python-function option, you need \
  to supply the function name prepended by the module name:"
          R"(
  
      --python-function myutils.breakpoint_callback
  
  The function itself must have the following prototype:
  
  def breakpoint_callback(frame, bp_loc, dict):
    # Your code goes here
  
  )"
          "The arguments are the same as the arguments passed to generated functions as \
  described above.  Note that the global variable 'lldb.frame' will NOT be updated when \
  this function is called, so be sure to use the 'frame' argument. The 'frame' argument \
  can get you to the thread via frame.GetThread(), the thread can get you to the \
  process via thread.GetProcess(), and the process can get you back to the target \
  via process.GetTarget()."
          R"(
  
  )"
          "Important Note: As Python code gets collected into functions, access to global \
  variables requires explicit scoping using the 'global' keyword.  Be sure to use correct \
  Python syntax, including indentation, when entering Python breakpoint commands."
          R"(
  
  Example Python one-line breakpoint command:
  
  (lldb) breakpoint command add -s python 1
  Enter your Python command(s). Type 'DONE' to end.
  > print "Hit this breakpoint!"
  > DONE
  
  As a convenience, this also works for a short Python one-liner:
  
  (lldb) breakpoint command add -s python 1 -o 'import time; print time.asctime()'
  (lldb) run
  Launching '.../a.out'  (x86_64)
  (lldb) Fri Sep 10 12:17:45 2010
  Process 21778 Stopped
  * thread #1: tid = 0x2e03, 0x0000000100000de8 a.out`c + 7 at main.c:39, stop reason = breakpoint 1.1, queue = com.apple.main-thread
    36
    37   	int c(int val)
    38   	{
    39 ->	    return val + 3;
    40   	}
    41
    42   	int main (int argc, char const *argv[])
  
  Example multiple line Python breakpoint command:
  
  (lldb) breakpoint command add -s p 1
  Enter your Python command(s). Type 'DONE' to end.
  > global bp_count
  > bp_count = bp_count + 1
  > print "Hit this breakpoint " + repr(bp_count) + " times!"
  > DONE
  
  Example multiple line Python breakpoint command, using function definition:
  
  (lldb) breakpoint command add -s python 1
  Enter your Python command(s). Type 'DONE' to end.
  > def breakpoint_output (bp_no):
  >     out_string = "Hit breakpoint number " + repr (bp_no)
  >     print out_string
  >     return True
  > breakpoint_output (1)
  > DONE
  
  )"
          "In this case, since there is a reference to a global variable, \
  'bp_count', you will also need to make sure 'bp_count' exists and is \
  initialized:"
          R"(
  
  (lldb) script
  >>> bp_count = 0
  >>> quit()
  
  )"
          "Your Python code, however organized, can optionally return a value.  \
  If the returned value is False, that tells LLDB not to stop at the breakpoint \
  to which the code is associated. Returning anything other than False, or even \
  returning None, or even omitting a return statement entirely, will cause \
  LLDB to stop."
          R"(
  
  )"
          "Final Note: A warning that no breakpoint command was generated when there \
  are no syntax errors may indicate that a function was declared but never called.");
  
      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);
    }
  
    ~CommandObjectBreakpointCommandAdd() override = default;
  
    Options *GetOptions() override { return &m_options; }
  
    void IOHandlerActivated(IOHandler &io_handler) override {
      StreamFileSP output_sp(io_handler.GetOutputStreamFile());
      if (output_sp) {
        output_sp->PutCString(g_reader_instructions);
        output_sp->Flush();
      }
    }
  
    void IOHandlerInputComplete(IOHandler &io_handler,
                                std::string &line) override {
      io_handler.SetIsDone(true);
  
      std::vector<BreakpointOptions *> *bp_options_vec =
          (std::vector<BreakpointOptions *> *)io_handler.GetUserData();
      for (BreakpointOptions *bp_options : *bp_options_vec) {
        if (!bp_options)
          continue;
  
        auto cmd_data = llvm::make_unique<BreakpointOptions::CommandData>();
        cmd_data->user_source.SplitIntoLines(line.c_str(), line.size());
        bp_options->SetCommandDataCallback(cmd_data);
      }
    }
  
    void CollectDataForBreakpointCommandCallback(
        std::vector<BreakpointOptions *> &bp_options_vec,
        CommandReturnObject &result) {
      m_interpreter.GetLLDBCommandsFromIOHandler(
          "> ",             // Prompt
          *this,            // IOHandlerDelegate
          true,             // Run IOHandler in async mode
          &bp_options_vec); // Baton for the "io_handler" that will be passed back
                            // into our IOHandlerDelegate functions
    }
  
    /// Set a one-liner as the callback for the breakpoint.
    void
    SetBreakpointCommandCallback(std::vector<BreakpointOptions *> &bp_options_vec,
                                 const char *oneliner) {
      for (auto bp_options : bp_options_vec) {
        auto cmd_data = llvm::make_unique<BreakpointOptions::CommandData>();
  
        cmd_data->user_source.AppendString(oneliner);
        cmd_data->stop_on_error = m_options.m_stop_on_error;
  
        bp_options->SetCommandDataCallback(cmd_data);
      }
    }
  
    class CommandOptions : public Options {
    public:
      CommandOptions()
          : Options(), m_use_commands(false), m_use_script_language(false),
            m_script_language(eScriptLanguageNone), m_use_one_liner(false),
            m_one_liner(), m_function_name() {}
  
      ~CommandOptions() override = default;
  
      Status SetOptionValue(uint32_t option_idx, llvm::StringRef option_arg,
                            ExecutionContext *execution_context) override {
        Status error;
        const int short_option = m_getopt_table[option_idx].val;
  
        switch (short_option) {
        case 'o':
          m_use_one_liner = true;
          m_one_liner = option_arg;
          break;
  
        case 's':
          m_script_language = (lldb::ScriptLanguage)OptionArgParser::ToOptionEnum(
              option_arg, g_breakpoint_add_options[option_idx].enum_values,
              eScriptLanguageNone, error);
  
          if (m_script_language == eScriptLanguagePython ||
              m_script_language == eScriptLanguageDefault) {
            m_use_script_language = true;
          } else {
            m_use_script_language = false;
          }
          break;
  
        case 'e': {
          bool success = false;
          m_stop_on_error =
              OptionArgParser::ToBoolean(option_arg, false, &success);
          if (!success)
            error.SetErrorStringWithFormat(
                "invalid value for stop-on-error: \"%s\"",
                option_arg.str().c_str());
        } break;
  
        case 'F':
          m_use_one_liner = false;
          m_use_script_language = true;
          m_function_name.assign(option_arg);
          break;
  
        case 'D':
          m_use_dummy = true;
          break;
  
        default:
          break;
        }
        return error;
      }
  
      void OptionParsingStarting(ExecutionContext *execution_context) override {
        m_use_commands = true;
        m_use_script_language = false;
        m_script_language = eScriptLanguageNone;
  
        m_use_one_liner = false;
        m_stop_on_error = true;
        m_one_liner.clear();
        m_function_name.clear();
        m_use_dummy = false;
      }
  
      llvm::ArrayRef<OptionDefinition> GetDefinitions() override {
        return llvm::makeArrayRef(g_breakpoint_add_options);
      }
  
      // Instance variables to hold the values for command options.
  
      bool m_use_commands;
      bool m_use_script_language;
      lldb::ScriptLanguage m_script_language;
  
      // Instance variables to hold the values for one_liner options.
      bool m_use_one_liner;
      std::string m_one_liner;
      bool m_stop_on_error;
      std::string m_function_name;
      bool m_use_dummy;
    };
  
  protected:
    bool DoExecute(Args &command, CommandReturnObject &result) override {
      Target *target = GetSelectedOrDummyTarget(m_options.m_use_dummy);
  
      if (target == nullptr) {
        result.AppendError("There is not a current executable; there are no "
                           "breakpoints to which to add commands");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
  
      const BreakpointList &breakpoints = target->GetBreakpointList();
      size_t num_breakpoints = breakpoints.GetSize();
  
      if (num_breakpoints == 0) {
        result.AppendError("No breakpoints exist to have commands added");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
  
      if (!m_options.m_use_script_language &&
          !m_options.m_function_name.empty()) {
        result.AppendError("need to enable scripting to have a function run as a "
                           "breakpoint command");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
  
      BreakpointIDList valid_bp_ids;
      CommandObjectMultiwordBreakpoint::VerifyBreakpointOrLocationIDs(
          command, target, result, &valid_bp_ids,
          BreakpointName::Permissions::PermissionKinds::listPerm);
  
      m_bp_options_vec.clear();
  
      if (result.Succeeded()) {
        const size_t count = valid_bp_ids.GetSize();
  
        for (size_t i = 0; i < count; ++i) {
          BreakpointID cur_bp_id = valid_bp_ids.GetBreakpointIDAtIndex(i);
          if (cur_bp_id.GetBreakpointID() != LLDB_INVALID_BREAK_ID) {
            Breakpoint *bp =
                target->GetBreakpointByID(cur_bp_id.GetBreakpointID()).get();
            BreakpointOptions *bp_options = nullptr;
            if (cur_bp_id.GetLocationID() == LLDB_INVALID_BREAK_ID) {
              // This breakpoint does not have an associated location.
              bp_options = bp->GetOptions();
            } else {
              BreakpointLocationSP bp_loc_sp(
                  bp->FindLocationByID(cur_bp_id.GetLocationID()));
              // This breakpoint does have an associated location. Get its
              // breakpoint options.
              if (bp_loc_sp)
                bp_options = bp_loc_sp->GetLocationOptions();
            }
            if (bp_options)
              m_bp_options_vec.push_back(bp_options);
          }
        }
  
        // If we are using script language, get the script interpreter in order
        // to set or collect command callback.  Otherwise, call the methods
        // associated with this object.
        if (m_options.m_use_script_language) {
          ScriptInterpreter *script_interp = m_interpreter.GetScriptInterpreter();
          // Special handling for one-liner specified inline.
          if (m_options.m_use_one_liner) {
            script_interp->SetBreakpointCommandCallback(
                m_bp_options_vec, m_options.m_one_liner.c_str());
          } else if (!m_options.m_function_name.empty()) {
            script_interp->SetBreakpointCommandCallbackFunction(
                m_bp_options_vec, m_options.m_function_name.c_str());
          } else {
            script_interp->CollectDataForBreakpointCommandCallback(
                m_bp_options_vec, result);
          }
        } else {
          // Special handling for one-liner specified inline.
          if (m_options.m_use_one_liner)
            SetBreakpointCommandCallback(m_bp_options_vec,
                                         m_options.m_one_liner.c_str());
          else
            CollectDataForBreakpointCommandCallback(m_bp_options_vec, result);
        }
      }
  
      return result.Succeeded();
    }
  
  private:
    CommandOptions m_options;
    std::vector<BreakpointOptions *> m_bp_options_vec; // This stores the
                                                       // breakpoint options that
                                                       // we are currently
    // collecting commands for.  In the CollectData... calls we need to hand this
    // off to the IOHandler, which may run asynchronously. So we have to have
    // some way to keep it alive, and not leak it. Making it an ivar of the
    // command object, which never goes away achieves this.  Note that if we were
    // able to run the same command concurrently in one interpreter we'd have to
    // make this "per invocation".  But there are many more reasons why it is not
    // in general safe to do that in lldb at present, so it isn't worthwhile to
    // come up with a more complex mechanism to address this particular weakness
    // right now.
    static const char *g_reader_instructions;
  };
  
  const char *CommandObjectBreakpointCommandAdd::g_reader_instructions =
      "Enter your debugger command(s).  Type 'DONE' to end.\n";
  
  //-------------------------------------------------------------------------
  // CommandObjectBreakpointCommandDelete
  //-------------------------------------------------------------------------
  
  static constexpr OptionDefinition g_breakpoint_delete_options[] = {
      // clang-format off
    { LLDB_OPT_SET_1, false, "dummy-breakpoints", 'D', OptionParser::eNoArgument, nullptr, {}, 0, eArgTypeNone, "Delete commands from Dummy breakpoints - i.e. breakpoints set before a file is provided, which prime new targets." },
      // clang-format on
  };
  
  class CommandObjectBreakpointCommandDelete : public CommandObjectParsed {
  public:
    CommandObjectBreakpointCommandDelete(CommandInterpreter &interpreter)
        : CommandObjectParsed(interpreter, "delete",
                              "Delete the set of commands from a breakpoint.",
                              nullptr),
          m_options() {
      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);
    }
  
    ~CommandObjectBreakpointCommandDelete() override = default;
  
    Options *GetOptions() override { return &m_options; }
  
    class CommandOptions : public Options {
    public:
      CommandOptions() : Options(), m_use_dummy(false) {}
  
      ~CommandOptions() override = default;
  
      Status SetOptionValue(uint32_t option_idx, llvm::StringRef option_arg,
                            ExecutionContext *execution_context) override {
        Status error;
        const int short_option = m_getopt_table[option_idx].val;
  
        switch (short_option) {
        case 'D':
          m_use_dummy = true;
          break;
  
        default:
          error.SetErrorStringWithFormat("unrecognized option '%c'",
                                         short_option);
          break;
        }
  
        return error;
      }
  
      void OptionParsingStarting(ExecutionContext *execution_context) override {
        m_use_dummy = false;
      }
  
      llvm::ArrayRef<OptionDefinition> GetDefinitions() override {
        return llvm::makeArrayRef(g_breakpoint_delete_options);
      }
  
      // Instance variables to hold the values for command options.
      bool m_use_dummy;
    };
  
  protected:
    bool DoExecute(Args &command, CommandReturnObject &result) override {
      Target *target = GetSelectedOrDummyTarget(m_options.m_use_dummy);
  
      if (target == nullptr) {
        result.AppendError("There is not a current executable; there are no "
                           "breakpoints from which to delete commands");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
  
      const BreakpointList &breakpoints = target->GetBreakpointList();
      size_t num_breakpoints = breakpoints.GetSize();
  
      if (num_breakpoints == 0) {
        result.AppendError("No breakpoints exist to have commands deleted");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
  
      if (command.empty()) {
        result.AppendError(
            "No breakpoint specified from which to delete the commands");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
  
      BreakpointIDList valid_bp_ids;
      CommandObjectMultiwordBreakpoint::VerifyBreakpointOrLocationIDs(
          command, target, result, &valid_bp_ids, 
          BreakpointName::Permissions::PermissionKinds::listPerm);
  
      if (result.Succeeded()) {
        const size_t count = valid_bp_ids.GetSize();
        for (size_t i = 0; i < count; ++i) {
          BreakpointID cur_bp_id = valid_bp_ids.GetBreakpointIDAtIndex(i);
          if (cur_bp_id.GetBreakpointID() != LLDB_INVALID_BREAK_ID) {
            Breakpoint *bp =
                target->GetBreakpointByID(cur_bp_id.GetBreakpointID()).get();
            if (cur_bp_id.GetLocationID() != LLDB_INVALID_BREAK_ID) {
              BreakpointLocationSP bp_loc_sp(
                  bp->FindLocationByID(cur_bp_id.GetLocationID()));
              if (bp_loc_sp)
                bp_loc_sp->ClearCallback();
              else {
                result.AppendErrorWithFormat("Invalid breakpoint ID: %u.%u.\n",
                                             cur_bp_id.GetBreakpointID(),
                                             cur_bp_id.GetLocationID());
                result.SetStatus(eReturnStatusFailed);
                return false;
              }
            } else {
              bp->ClearCallback();
            }
          }
        }
      }
      return result.Succeeded();
    }
  
  private:
    CommandOptions m_options;
  };
  
  //-------------------------------------------------------------------------
  // CommandObjectBreakpointCommandList
  //-------------------------------------------------------------------------
  
  class CommandObjectBreakpointCommandList : public CommandObjectParsed {
  public:
    CommandObjectBreakpointCommandList(CommandInterpreter &interpreter)
        : CommandObjectParsed(interpreter, "list", "List the script or set of "
                                                   "commands to be executed when "
                                                   "the breakpoint is hit.",
                              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);
    }
  
    ~CommandObjectBreakpointCommandList() override = default;
  
  protected:
    bool DoExecute(Args &command, CommandReturnObject &result) override {
      Target *target = m_interpreter.GetDebugger().GetSelectedTarget().get();
  
      if (target == nullptr) {
        result.AppendError("There is not a current executable; there are no "
                           "breakpoints for which to list commands");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
  
      const BreakpointList &breakpoints = target->GetBreakpointList();
      size_t num_breakpoints = breakpoints.GetSize();
  
      if (num_breakpoints == 0) {
        result.AppendError("No breakpoints exist for which to list commands");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
  
      if (command.empty()) {
        result.AppendError(
            "No breakpoint specified for which to list the commands");
        result.SetStatus(eReturnStatusFailed);
        return false;
      }
  
      BreakpointIDList valid_bp_ids;
      CommandObjectMultiwordBreakpoint::VerifyBreakpointOrLocationIDs(
          command, target, result, &valid_bp_ids, 
          BreakpointName::Permissions::PermissionKinds::listPerm);
  
      if (result.Succeeded()) {
        const size_t count = valid_bp_ids.GetSize();
        for (size_t i = 0; i < count; ++i) {
          BreakpointID cur_bp_id = valid_bp_ids.GetBreakpointIDAtIndex(i);
          if (cur_bp_id.GetBreakpointID() != LLDB_INVALID_BREAK_ID) {
            Breakpoint *bp =
                target->GetBreakpointByID(cur_bp_id.GetBreakpointID()).get();
  
            if (bp) {
              BreakpointLocationSP bp_loc_sp;
              if (cur_bp_id.GetLocationID() != LLDB_INVALID_BREAK_ID) {
                    bp_loc_sp = bp->FindLocationByID(cur_bp_id.GetLocationID());
                if (!bp_loc_sp)
                {
                  result.AppendErrorWithFormat("Invalid breakpoint ID: %u.%u.\n",
                                               cur_bp_id.GetBreakpointID(),
                                               cur_bp_id.GetLocationID());
                  result.SetStatus(eReturnStatusFailed);
                  return false;
                }
              }
  
              StreamString id_str;
              BreakpointID::GetCanonicalReference(&id_str,
                                                  cur_bp_id.GetBreakpointID(),
                                                  cur_bp_id.GetLocationID());
              const Baton *baton = nullptr;
              if (bp_loc_sp)
                baton = bp_loc_sp
                 ->GetOptionsSpecifyingKind(BreakpointOptions::eCallback)
                 ->GetBaton();
              else
                baton = bp->GetOptions()->GetBaton();
  
              if (baton) {
                result.GetOutputStream().Printf("Breakpoint %s:\n",
                                                id_str.GetData());
                result.GetOutputStream().IndentMore();
                baton->GetDescription(&result.GetOutputStream(),
                                      eDescriptionLevelFull);
                result.GetOutputStream().IndentLess();
              } else {
                result.AppendMessageWithFormat(
                    "Breakpoint %s does not have an associated command.\n",
                    id_str.GetData());
              }
            }
            result.SetStatus(eReturnStatusSuccessFinishResult);
          } else {
            result.AppendErrorWithFormat("Invalid breakpoint ID: %u.\n",
                                         cur_bp_id.GetBreakpointID());
            result.SetStatus(eReturnStatusFailed);
          }
        }
      }
  
      return result.Succeeded();
    }
  };
  
  //-------------------------------------------------------------------------
  // CommandObjectBreakpointCommand
  //-------------------------------------------------------------------------
  
  CommandObjectBreakpointCommand::CommandObjectBreakpointCommand(
      CommandInterpreter &interpreter)
      : CommandObjectMultiword(
            interpreter, "command", "Commands for adding, removing and listing "
                                    "LLDB commands executed when a breakpoint is "
                                    "hit.",
            "command <sub-command> [<sub-command-options>] <breakpoint-id>") {
    CommandObjectSP add_command_object(
        new CommandObjectBreakpointCommandAdd(interpreter));
    CommandObjectSP delete_command_object(
        new CommandObjectBreakpointCommandDelete(interpreter));
    CommandObjectSP list_command_object(
        new CommandObjectBreakpointCommandList(interpreter));
  
    add_command_object->SetCommandName("breakpoint command add");
    delete_command_object->SetCommandName("breakpoint command delete");
    list_command_object->SetCommandName("breakpoint command list");
  
    LoadSubCommand("add", add_command_object);
    LoadSubCommand("delete", delete_command_object);
    LoadSubCommand("list", list_command_object);
  }
  
  CommandObjectBreakpointCommand::~CommandObjectBreakpointCommand() = default;
  