The graphical user interface GUI domainates the current operating environments for personal computing. However, there are still tons of powerful tools, such as gcc and gdb, using the traditional text-based interface.
If you have problem login these machines, please contact Hung-Wei. It is widely adopted as the default compiler of UNIX-like systems. Assume that we have a C source file "garbage. If you are interested about how the assembly code of garbage. You may use any text editor to browser the content of the assembly code. To figure out what the assembly code does, you may reference the following documents. Handout on x86 ISA. A good document on x86 ISA. Gdb can step through your source code line-by-line or even instruction by instruction.
You may also watch the value of any variable at run-time. In additon, it also helps to identify the place and the reason making the program crash.
All program to be debugged in gdb must be compiled by gcc with the option "-g" turning on. Continue with the "garbage" example, if we want to debug the program "garbage", we can simply start gdb by: gdb. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "iredhat-linux-gnu" To show the current breakpoints we have, we may use the "info breakpoint" command as: gdb info breakpoint Num Type Disp Enb Address What 1 breakpoint keep y 0xf7b in main at garbage.
Once a running program is interrupted in gdb, we can also inspect the value of a variable using the "print" command.
If we are interested about all the register values, we can use "info registers" command to display the value in all registers.The most common application errors are called exceptions.
These include access violations, division-by-zero errors, numerical overflows, CLR exceptions, and many other kinds of errors. Applications can also cause breakpoint interrupts. These occur when Windows is unable to run the application for example, when a necessary module cannot be loaded or when a breakpoint is encountered.
Breakpoints can be inserted into the code by a debugger, or invoked through a function such as DebugBreak. Based on configuration values and which debuggers are active, Windows handles user-mode errors in a variety of ways. The following sequence shows the precedence used for user mode error handling:. If a user-mode debugger is currently attached to the faulting process, all errors will cause the target to break into this debugger.
As long as the user-mode debugger is attached, no other error-handling methods will be used -- even if the gn Go With Exception Not Handled command is used.
If no user-mode debugger is attached and the executing code has its own exception handling routines for example, try - exceptthis exception handling routine will attempt to deal with the error.
If no user-mode debugger is attached, and Windows has an open kernel-debugging connection, and the error is a breakpoint interrupt, Windows will attempt to contact the kernel debugger. Kernel debugging connections must be opened during Windows' boot process.
If you wish to prevent a user-mode interrupt from breaking into the kernel debugger, you can use the KDbgCtrl utility with the -du parameter. In the kernel debugger, you can use gh Go With Exception Handled to disregard the error and continue running the target. If the conditions in steps 1, 2, and 3 do not apply, Windows will activate a debugging tool configured in the AeDebug registry values. Any program can be selected in advance as the tool to use in this situation.
The chosen program is referred to as the postmortem debugger. If the conditions in steps 1, 2, and 3 do not apply, and there is no postmortem debugger registered, Windows Error Reporting WER displays a message and provides solutions if any are available.
WER also writes a memory dump file if the appropriate values are set in the Registry. If a postmortem debugger has been installed, you can deliberately break into the debugger from a user-mode application by calling the DebugBreak function. This section describes how to configure tools such as WinDbg as the postmortem debugger. Once configured, the postmortem debugger will be automatically started whenever an application crashes. There are two primary registry values of interest, Debugger and Auto.
The Debugger registry value specifies the command line for the postmortem debugger.This article introduces the features of the Visual Studio debugger in a step-by-step walkthrough. If you want a higher-level view of the debugger features, see First look at the debugger. When you debug your appit usually means that you are running your application with the debugger attached.
The screenshots are in Visual Basic. You must have Visual Studio installed and the.
Enabling Postmortem Debugging
NET Core cross-platform development workload. If you haven't already installed Visual Studio, go to the Visual Studio downloads page to install it for free. The Visual Studio Installer launches. Choose the. NET Core cross-platform development workload, then choose Modify. First, you'll create a. NET Core console application project.
The project type comes with all the template files you'll need, before you've even added anything!
In the New Project dialog box in the left pane, expand Visual Basicand then choose. NET Core. In the middle pane, choose Console App.
Tutorial of gcc and gdb
Then name the project get-started-debugging. If you don't see the Console App. NET Core cross-platform development workload, and then choose Modify. On the Create a new project window, enter or type console in the search box. After you apply the language and platform filters, choose the Console App.
NET Core template, and then choose Next. If you do not see the Console App. NET Core template, you can install it from the Create a new project window. In the Not finding what you're looking for? Then, in the Visual Studio Installer, choose the.
In the Configure your new project window, type or enter get-started-debugging in the Project name box.Version 1. Read about the new features and fixes from June.
One of the key features of Visual Studio Code is its great debugging support. VS Code's built-in debugger helps accelerate your edit, compile and debug loop.
VS Code has built-in debugging support for the Node. Tip: The extensions shown above are dynamically queried. Select an extension tile above to read the description and reviews to decide which extension is best for you.
The following documentation is based on the built-in Node. It is helpful to first create a sample Node. You can follow the Node. Once you have a simple application set up, this page will take you through VS Code debugging features. The Run view displays all information related to running and debugging and has a top bar with debugging commands and configuration settings.
If running and debugging is not yet configured no launch. However, for most debugging scenarios, creating a launch configuration file is beneficial because it allows you to configure and save debugging setup details. VS Code keeps debugging configuration information in a launch. To create a launch. VS Code will try to automatically detect your debug environment, but if this fails, you will have to choose it manually:. Note : You can debug a simple application even if you don't have a folder open in VS Code, but it is not possible to manage launch configurations and set up advanced debugging.
Note that the attributes available in launch configurations vary from debugger to debugger. Hover help is also available for all attributes. Do not assume that an attribute that is available for one debugger automatically works for other debuggers too. If you see green squiggles in your launch configuration, hover over them to learn what the problem is and try to fix them before launching a debug session. Review all automatically generated values and make sure that they make sense for your project and debugging environment.Debugging allows you to run a program interactively while watching the source code and the variables during the execution.
A breakpoint in the source code specifies where the execution of the program should stop during debugging. Once the program is stopped you can investigate variables, change their content, etc. Eclipse provides a Debug perspective which gives you a pre-configured set of views. Eclipse allows you to control the execution flow via debug commands. To define a breakpoint in your source code, right-click in the left margin in the Java editor and select Toggle Breakpoint. Alternatively you can double-click on this position.
To debug your application, select a Java file with a main method. If you started an application once via the context menu, you can use the created launch configuration again via the Debug button in the Eclipse toolbar.
If you have not defined any breakpoints, program as normally. To debug the program you need to define breakpoints. Eclipse asks you if you want to switch to the Debug perspective once a stop point is reached. Answer Yes in the corresponding dialog. Afterwards Eclipse opens this perspective.
Eclipse provides buttons in the toolbar for controlling the execution of the program you are debugging. Typically, it is easier to use the corresponding keys to control this execution. You can use allow use shortcut key to step through your coding. The meaning of these keys is explained in the following table. Executes the currently selected line and goes to the next line in your program. If the selected line is a method call the debugger steps into the associated code.
F6 steps over the call, i. F7 steps out to the caller of the currently executed method. This finishes the execution of the current method and returns to the caller of this method. F8 tells the Eclipse debugger to resume the execution of the program code until is reaches the next breakpoint or watchpoint. The call stack shows the parts of the program which are currently executed and how they relate to each other.Skip to main content.
Tous les produits. This step-by-step article describes how to debug a Windows service by using the WinDbg debugger windbg.
To debug a Windows service, you can attach the WinDbg debugger to the process that hosts the service after the service starts, or you can configure the service to start with the WinDbg debugger attached so that you can troubleshoot service-startup-related problems. This article describes both these methods. Use the process ID of the process that hosts the service that you want to debug To determine the process ID PID of the process that hosts the service that you want to debug, use one of the following methods.
The Windows Task Manager dialog box appears. Click the Processes tab of the Windows Task Manager dialog box. Under Image Nameclick the image name of the process that hosts the service that you want to debug.
Method 2: Use the Task List Utility tlist.
The Run dialog box appears. In the Open box, type cmdand then click OK. At the command prompt, change the directory path to reflect the location of the tlist.
Note The tlist. Note Make a note of the process ID of the process that hosts the service that you want to debug. At a command prompt, change the directory path to reflect the location of the windbg. Note If a command prompt is not open, follow steps a and b of Method 1.
The windbg. Note ProcessID is a placeholder for the process ID of the process that hosts the service that you want to debug. To do this, follow these steps: Click Startand then click Run. In the Open box, type cmdand then click OK to open a command prompt. At the command prompt, change the directory path to reflect the location of the windbg.
Note The windbg. Note ImageName is a placeholder for the image name of the process that hosts the service that you want to debug. The "-pn" command-line option specifies that the ImageName command-line argument is the image name of a process. Locate the windbg. Click to select the node that corresponds to the process that hosts the service that you want to debug, and then click OK. In the dialog box that appears, click Yes to save base workspace information.