Vs2013在Linux开发中的应用(19): 启动gdb

快乐虾

http://blog.csdn.net/lights_joy/

欢迎转载，但请保留作者信息

1.1    载入调试引擎

因为我们无法干预VC的调试引擎载入。但能够侦听VC的调试引擎载入事件，在此事件处理中能够调用自己的调试引擎：

        publicvoid LaunchDebugTarget(string filePath, string env)

        {

            varserver = (IDebugCoreServer3)GetService(typeof(IDebugCoreServer3));

            vardebugger = (IVsDebugger3)GetService(typeof(IVsDebugger));

            VsDebugTargetInfo3[] debugTargets = new VsDebugTargetInfo3[1];

            debugTargets[0].dlo = (uint)DEBUG_LAUNCH_OPERATION.DLO_CreateProcess;

            debugTargets[0].bstrExe = filePath;

            debugTargets[0].bstrEnv = env;

            debugTargets[0].guidLaunchDebugEngine = new Guid(lights.EmbedLinux.Debugger.Engine.EngineConstants.EngineId);

            VsDebugTargetProcessInfo[] processInfo = new VsDebugTargetProcessInfo[debugTargets.Length];

            try

            {

                debugger.LaunchDebugTargets3(1, debugTargets, processInfo);

            }

            catch(Exceptione)

            {

                Debug.WriteLine("Exception when Launch debugger: " + e.Message);

            }

        }

在此使用了IVsDebugger.LaunchDebugTarget3。在此调用中，SDM将依据EngineId查找此Engine所在的文件并进行引擎的创建。

1.2    LaunchSuspended

在SDM创建引擎后调用的第一个函数是LauchSuspended：

        // Launches a process by means of the debug engine.

        // Normally, Visual Studio launches a program using theIDebugPortEx2::LaunchSuspended method and then attaches the debugger

        // to the suspended program. However, there arecircumstances in which the debug engine may need to launch a program

        // (for example, if the debug engine is part of aninterpreter and the program being debugged is an interpreted language),

        // in which case Visual Studio uses theIDebugEngineLaunch2::LaunchSuspended method

        // The IDebugEngineLaunch2::ResumeProcess method iscalled to start the process after the process has been successfully launched ina suspended state.

        intIDebugEngineLaunch2.LaunchSuspended(string pszServer, IDebugPort2 port, string exe, string args, string dir, string env, string options, enum_LAUNCH_FLAGS launchFlags, uint hStdInput, uint hStdOutput, uint hStdError, IDebugEventCallback2 ad7Callback, out IDebugProcess2 process)

在此函数中，我们能够让python通过某个连接载入虚拟机里的gdb。再将python进程的ID号返回给SDM：

            AD_PROCESS_ID adProcessId = new AD_PROCESS_ID();

            adProcessId.ProcessIdType = (uint)enum_AD_PROCESS_ID.AD_PROCESS_ID_SYSTEM;

            adProcessId.dwProcessId= (uint)_process.Id;

            EngineUtils.RequireOk(port.GetProcess(adProcessId,out process));

1.3    ResumeProcess

SDM调用的第二个关键函数是ResumeProcess：

        // Resume a process launched byIDebugEngineLaunch2.LaunchSuspended

        intIDebugEngineLaunch2.ResumeProcess(IDebugProcess2 process)

这个函数感觉有点歧义，似乎应该在这里让gdb里载入的应用执行起来，但实际上，在这个函数里应该做的是创建ProgramNode：

            // Send a program node to the SDM. This will cause theSDM to turn around and call IDebugEngine2.Attach

            // which will complete the hookup with AD7

            IDebugPort2port;

            EngineUtils.RequireOk(process.GetPort(outport));

            IDebugDefaultPort2 defaultPort = (IDebugDefaultPort2)port;

            IDebugPortNotify2 portNotify;

            EngineUtils.RequireOk(defaultPort.GetPortNotify(out portNotify));

            EngineUtils.RequireOk(portNotify.AddProgramNode(new AD7ProgramNode(_process.Id)));

1.4    Attach

下一个关键函数：

        // Attach the debug engine to a program.

        intIDebugEngine2.Attach(IDebugProgram2[] rgpPrograms, IDebugProgramNode2[] rgpProgramNodes, uint celtPrograms, IDebugEventCallback2 ad7Callback, enum_ATTACH_REASON dwReason)

在这个函数中。我们须要发送两个事件给SDM：

            AD7EngineCreateEvent.Send(this);

            AD7ProgramCreateEvent.Send(this);

1.5    LoadComplete

当gdb成功载入应用程序后，我们须要发送LoadComplete通知SDM：

            Send(newAD7LoadCompleteEvent(), AD7LoadCompleteEvent.IID, thread);

1.6    设置断点

设置断点的工作后面单独说，在此先跳过。

1.7    Continue

在断点设置完毕后，SDM将调用Continue：

        // Continue is called from the SDM when it wantsexecution to continue in the debugee

        // but have stepping state remain. An example is when atracepoint is executed,

        // and the debugger does not want to actually enter breakmode.

        publicint Continue(IDebugThread2 pThread)

在这个函数中就能够让gdb执行run命令了。

至此，SDM成功载入gdb及要调试的应用。