C++ Thread::SetSelectedFrameByIndex方法代码示例

SBError SBThread::UnwindInnermostExpression() {
  SBError sb_error;

  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_API));

  std::unique_lock<std::recursive_mutex> lock;
  ExecutionContext exe_ctx(m_opaque_sp.get(), lock);

  if (log)
    log->Printf("SBThread(%p)::UnwindExpressionEvaluation",
                static_cast<void *>(exe_ctx.GetThreadPtr()));

  if (exe_ctx.HasThreadScope()) {
    Thread *thread = exe_ctx.GetThreadPtr();
    sb_error.SetError(thread->UnwindInnermostExpression());
    if (sb_error.Success())
      thread->SetSelectedFrameByIndex(0, false);
  }

  return sb_error;
}

void REPL::IOHandlerInputComplete(IOHandler &io_handler, std::string &code) {
  lldb::StreamFileSP output_sp(io_handler.GetOutputStreamFile());
  lldb::StreamFileSP error_sp(io_handler.GetErrorStreamFile());
  bool extra_line = false;
  bool did_quit = false;

  if (code.empty()) {
    m_code.AppendString("");
    static_cast<IOHandlerEditline &>(io_handler)
        .SetBaseLineNumber(m_code.GetSize() + 1);
  } else {
    Debugger &debugger = m_target.GetDebugger();
    CommandInterpreter &ci = debugger.GetCommandInterpreter();
    extra_line = ci.GetSpaceReplPrompts();

    ExecutionContext exe_ctx(m_target.GetProcessSP()
                                 ->GetThreadList()
                                 .GetSelectedThread()
                                 ->GetSelectedFrame()
                                 .get());

    lldb::ProcessSP process_sp(exe_ctx.GetProcessSP());

    if (code[0] == ':') {
      // Meta command
      // Strip the ':'
      code.erase(0, 1);
      if (Args::StripSpaces(code)) {
        // "lldb" was followed by arguments, so just execute the command dump
        // the results

        // Turn off prompt on quit in case the user types ":quit"
        const bool saved_prompt_on_quit = ci.GetPromptOnQuit();
        if (saved_prompt_on_quit)
          ci.SetPromptOnQuit(false);

        // Execute the command
        CommandReturnObject result;
        result.SetImmediateOutputStream(output_sp);
        result.SetImmediateErrorStream(error_sp);
        ci.HandleCommand(code.c_str(), eLazyBoolNo, result);

        if (saved_prompt_on_quit)
          ci.SetPromptOnQuit(true);

        if (result.GetStatus() == lldb::eReturnStatusQuit) {
          did_quit = true;
          io_handler.SetIsDone(true);
          if (debugger.CheckTopIOHandlerTypes(
                  IOHandler::Type::REPL, IOHandler::Type::CommandInterpreter)) {
            // We typed "quit" or an alias to quit so we need to check if the
            // command interpreter is above us and tell it that it is done as
            // well
            // so we don't drop back into the command interpreter if we have
            // already
            // quit
            lldb::IOHandlerSP io_handler_sp(ci.GetIOHandler());
            if (io_handler_sp)
              io_handler_sp->SetIsDone(true);
          }
        }
      } else {
        // ":" was followed by no arguments, so push the LLDB command prompt
        if (debugger.CheckTopIOHandlerTypes(
                IOHandler::Type::REPL, IOHandler::Type::CommandInterpreter)) {
          // If the user wants to get back to the command interpreter and the
          // command interpreter is what launched the REPL, then just let the
          // REPL exit and fall back to the command interpreter.
          io_handler.SetIsDone(true);
        } else {
          // The REPL wasn't launched the by the command interpreter, it is the
          // base IOHandler, so we need to get the command interpreter and
          lldb::IOHandlerSP io_handler_sp(ci.GetIOHandler());
          if (io_handler_sp) {
            io_handler_sp->SetIsDone(false);
            debugger.PushIOHandler(ci.GetIOHandler());
          }
        }
      }
    } else {
      // Unwind any expression we might have been running in case our REPL
      // expression crashed and the user was looking around
      if (m_dedicated_repl_mode) {
        Thread *thread = exe_ctx.GetThreadPtr();
        if (thread && thread->UnwindInnermostExpression().Success()) {
          thread->SetSelectedFrameByIndex(0, false);
          exe_ctx.SetFrameSP(thread->GetSelectedFrame());
        }
      }

      const bool colorize_err = error_sp->GetFile().GetIsTerminalWithColors();

      EvaluateExpressionOptions expr_options;
      expr_options.SetCoerceToId(m_varobj_options.use_objc);
      expr_options.SetUnwindOnError(m_command_options.unwind_on_error);
      expr_options.SetIgnoreBreakpoints(m_command_options.ignore_breakpoints);
      expr_options.SetKeepInMemory(true);
      expr_options.SetUseDynamic(m_varobj_options.use_dynamic);
      expr_options.SetTryAllThreads(m_command_options.try_all_threads);
      expr_options.SetGenerateDebugInfo(true);
//.........这里部分代码省略.........

    bool
    DoExecute (Args& command,
             CommandReturnObject &result)
    {
        ExecutionContext exe_ctx (m_interpreter.GetExecutionContext());
        Thread *thread = exe_ctx.GetThreadPtr();
        if (thread)
        {
            uint32_t frame_idx = UINT32_MAX;
            if (m_options.relative_frame_offset != INT32_MIN)
            {
                // The one and only argument is a signed relative frame index
                frame_idx = thread->GetSelectedFrameIndex ();
                if (frame_idx == UINT32_MAX)
                    frame_idx = 0;
                
                if (m_options.relative_frame_offset < 0)
                {
                    if (frame_idx >= -m_options.relative_frame_offset)
                        frame_idx += m_options.relative_frame_offset;
                    else
                    {
                        if (frame_idx == 0)
                        {
                            //If you are already at the bottom of the stack, then just warn and don't reset the frame.
                            result.AppendError("Already at the bottom of the stack");
                            result.SetStatus(eReturnStatusFailed);
                            return false;
                        }
                        else
                            frame_idx = 0;
                    }
                }
                else if (m_options.relative_frame_offset > 0)
                {
                    // I don't want "up 20" where "20" takes you past the top of the stack to produce
                    // an error, but rather to just go to the top.  So I have to count the stack here...
                    const uint32_t num_frames = thread->GetStackFrameCount();
                    if (num_frames - frame_idx > m_options.relative_frame_offset)
                        frame_idx += m_options.relative_frame_offset;
                    else
                    {
                        if (frame_idx == num_frames - 1)
                        {
                            //If we are already at the top of the stack, just warn and don't reset the frame.
                            result.AppendError("Already at the top of the stack");
                            result.SetStatus(eReturnStatusFailed);
                            return false;
                        }
                        else
                            frame_idx = num_frames - 1;
                    }
                }
            }
            else 
            {
                if (command.GetArgumentCount() == 1)
                {
                    const char *frame_idx_cstr = command.GetArgumentAtIndex(0);
                    frame_idx = Args::StringToUInt32 (frame_idx_cstr, UINT32_MAX, 0);
                }
                else if (command.GetArgumentCount() == 0)
                {
                    frame_idx = thread->GetSelectedFrameIndex ();
                    if (frame_idx == UINT32_MAX)
                    {
                        frame_idx = 0;
                    }
                }
                else
                {
                    result.AppendError ("invalid arguments.\n");
                    m_options.GenerateOptionUsage (result.GetErrorStream(), this);
                }
            }

            const bool broadcast = true;
            bool success = thread->SetSelectedFrameByIndex (frame_idx, broadcast);
            if (success)
            {
                exe_ctx.SetFrameSP(thread->GetSelectedFrame ());
                StackFrame *frame = exe_ctx.GetFramePtr();
                if (frame)
                {
                    bool already_shown = false;
                    SymbolContext frame_sc(frame->GetSymbolContext(eSymbolContextLineEntry));
                    if (m_interpreter.GetDebugger().GetUseExternalEditor() && frame_sc.line_entry.file && frame_sc.line_entry.line != 0)
                    {
                        already_shown = Host::OpenFileInExternalEditor (frame_sc.line_entry.file, frame_sc.line_entry.line);
                    }

                    bool show_frame_info = true;
                    bool show_source = !already_shown;
                    if (frame->GetStatus (result.GetOutputStream(), show_frame_info, show_source))
                    {
                        result.SetStatus (eReturnStatusSuccessFinishResult);
                        return result.Succeeded();
                    }
                }
            }
//.........这里部分代码省略.........