How to module debug golang

Golang is a strongly typed language, it is a compiled execution language, which means that users need to compile the code to execute it. When writing quality software, debugging your code is very important. When a bug in the code is discovered, it can cause the program to fail or produce unexpected results. This article will introduce how to debug modules in Golang.

1. Debugging with GDB

GDB is a powerful debugging tool that can be used in a variety of programming languages. In Golang, GDB can be used in conjunction with the golang runtime library to track the running status of the process, memory leaks and other issues. The first step in using GDB is to use the -g flag when compiling your code to save symbols and debugging information. For example:

go build -gcflags "-N -l" -o myapp main.go

Then, use GDB to run the program and set breakpoints. For example, to set a breakpoint in function myFunc, run the following command:

(gdb) break myFunc

Next, run the program:

(gdb) run

Once the program stops running at the myFunc breakpoint, you can use GDB to check Variables and the call stack, continue stepping through your program, or modify variables directly in your code.

2. Debugging with Delve

Delve is a fast, flexible and easy-to-use debugger that can be used with Golang. Unlike GDB, Delve was developed specifically for Golang, so it is very easy to use and has many Golang-specific features. Delve provides command line tools and debugging APIs that can be used from the command line or in an IDE.

First you need to use the go get tool to install Delve:

go get github.com/go-delve/delve/cmd/dlv

Next, use the following command to start the program in the debugger:

dlv debug <your_program.go>

During the process of starting the program, Delve will It will automatically stop on the first line of code. To set a breakpoint, you can press Ctrl-C at any time or enter the break myFunc command to set a breakpoint on function myFunc. After starting the program, when the program enters this function, it will stop at this breakpoint.

You can use many commands to view and modify program status. Some common commands are as follows:

• Modify the value of a variable: set 4427259a143dae059a7f20af7ef733ee = 8487820b627113dd990f63dd2ef215f3
• Print the value of a variable: print 4427259a143dae059a7f20af7ef733ee
• Display the source code of the function: list 8fd0b0dd077e9e3b89425c7034f15437
• Continue executing the program to the next breakpoint: continue

Delve also has some other features, for example, it can be used in the IDE Install the Delve plug-in, enable DEBUG mode, start the program with one click, and easily add breakpoints.

3. Debugging with Log

In some cases, if you have a large code base or use a different architecture, the debugger may become too complex or too Difficult to use. In this case, it might be better to use log debugging. In Golang, you can add logs to your code using the built-in log module to capture issues that occur during program execution.

The log module mainly has four log levels, namely INFO, WARNING, ERROR and FATAL. You can use this module to log to a file or output to the console.

For example, in the main function of the program, you can use the following code to enable DEBUG level logging:

import "log"

func main() {
    log.SetFlags(log.LstdFlags | log.Lshortfile)
    log.SetLevel(log.DebugLevel)

    log.Debug("Starting program...")
    // ...
}

Then, you can log anywhere in the code:

log.Debugf("x=%d", x)

When the program is running, calling any log function will write the corresponding message to the standard output, such as the terminal or output file.

Summary

No matter which tool you choose to use or which style of debugging you prefer, debugging is an essential tool for finding and solving problems with all programs. In Golang, you can use GDB, Delve or log to debug and tune your code. Use these tools and techniques to improve code readability, performance, and robustness, making your software more reliable.

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