How to debug Golang functions using breakpoints?

Use the breakpoint package for breakpoint debugging in Go: add breakpoint code before the line to be debugged to set a breakpoint. Use debugger.ClearBreakpoint(&breakpoint) to remove breakpoints. Debug by executing dlv debug, setting breakpoints, and stepping through the code.

#How to use breakpoints to debug Golang functions?

Breakpoint debugging is a powerful tool for identifying errors in your code and understanding its execution flow. In the Go language, you can use the breakpoint package to set and remove breakpoints.

Set a breakpoint

To set a breakpoint, add the following code before the line number of the line in the code where you want to stop execution:

import "github.com/derekparker/delve/cmd/dlv/cmds/headless/debugger"

var breakpoint = debugger.Breakpoint{
    Line: 10,
}

The Line field specifies the line number on which to set the breakpoint. You can also specify other fields, such as conditions or commands, to customize the breakpoint's behavior.

Remove breakpoints

To remove breakpoints, you can use the following code:

debugger.ClearBreakpoint(&breakpoint)

Practical case

Consider the following code, which adds numbers and returns the result:

package main

import "fmt"

func sum(a, b int) int {
    return a + b
}

func main() {
    fmt.Println(sum(1, 2))
}

To debug this code, you can perform the following steps:

1. Run dlv debug Order.
2. Set a breakpoint on line 10.
3. Use the n command to step through the code.

When execution reaches the breakpoint, the program will pause execution and display the following output:

 > #1  /home/username/code/main.go:10        sum(1, 2)
[resume] ...

This indicates that the program has stopped at line 10, where sum is called Function. You can also check the values ​​of variables and step through functions using the stepi and stepo commands.

Using breakpoints makes it easy to debug Go code and helps identify and resolve errors quickly.

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