An article introducing Golang’s breakpoint debugging tool

Golang is a rapidly growing programming language whose power lies in its simplicity and efficiency. Golang's community and ecosystem are growing rapidly as more and more programmers use it as the language of choice for writing backend services and distributed systems.

When using Golang, a very important feature is debugging code. Golang's breakpoint debugging tool is a powerful helper when debugging large and complex systems. This article will introduce Golang's breakpoint debugging tools and how to use these tools to debug our code.

1. Breakpoint debugging tool

In Golang, we can use the built-in breakpoint debugging tool to debug our code. There are mainly two ways:

1.1 Delve

Delve is an open source Golang debugger. It is a powerful command line tool that can help us insert breakpoints and debug during debugging. View variables, functions, and stack trace information. Delve runs on Linux, Mac and Windows operating systems and supports remote debugging. Its installation is very simple, just use the following command to install:

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

1.2 Visual Studio Code

Visual Studio Code is a very popular code editor that also provides built-in debugging tools. Using Visual Studio Code for Golang debugging is very simple. You only need to use the following command to install its Golang extension:

code --install-extension golang.go

After installing the extension, when you enable debugging in Visual Studio Code, the built-in Debugging tools.

2. Use Golang breakpoint debugging tools

The following is a simple sample program. We will use the above two breakpoint debugging tools to view the execution status of this program:

package main

import "fmt"

func main() {
    s := []int{6,5,4,3,2,1}
    fmt.Println(bubbleSort(s))
}

func bubbleSort(s []int) []int {
    for i := 0; i < len(s)-1; i++ {
        for j := 0; j < len(s)-i-1; j++ {
            if s[j] > s[j+1] {
                s[j], s[j+1] = s[j+1], s[j]
            }
        }
    }
    return s
}

2.1 Use Delve for breakpoint debugging

We can use Delve to insert breakpoints and view the values ​​of variables, function execution status and stack traces.

First, we need to use the following command to start the program and enter Delve debugging mode:

dlv debug main.go

Next, use the following command to insert a breakpoint where we want to debug:

break main.go:8

Now, we can start debugging and enter the breakpoint using the following command:

continue

Delve will stop when the program execution reaches the breakpoint we set and display the current stack trace information. We can use the following command to view the variable value or execute the specified function:

print s
next
print i
next
print j
next
print s
continue

After the continue command, the program will continue to execute. In addition, Delve also supports many other commands. Please refer to the official documentation for details.

2.2 Use Visual Studio Code for breakpoint debugging

We can also use Visual Studio Code’s built-in debugging tools to debug Golang code. First, open our program file and insert a breakpoint into the code by clicking on the line of code we want to debug.

Next, use the following steps to start debugging:

1. Select the debugging option in the sidebar of Visual Studio Code;
2. Click the Start button, Visual Studio Code The program will be started and entered into debugging mode;
3. In debugging mode, the program will execute to the breakpoint we set and display variables and stack trace information;
4. You can use the debugging console window to Execute the specified function or view the value of the variable;
5. The program will pause at the breakpoint before we continue executing the code.

3. Summary

Golang’s breakpoint debugging tool can help us detect problems and analyze code when debugging large and complex systems. This article introduces Golang's built-in Delve and Visual Studio Code debugging tools, and provides a simple sample program to demonstrate how to use these tools to view variable values, function execution status, and stack trace information when debugging a program.

In the actual development process, we can also use these breakpoint debugging tools in conjunction with other tools such as logging and unit testing to ensure the quality and correctness of the code and improve development efficiency.

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