How to use Delve debugger in Visual Studio Code

Question

I have installed the Go extension for VS Code, but unable to make it work.

"dlv debug" works alright from the terminal.

dlv debug src/github.com/user/hello

The launch.json:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch",
            "type": "go",
            "request": "launch",
            "mode": "debug",
            "program": "${workspaceRoot}",
            "env": {},
            "args": []
        }
    ]
}

Do you know how to set it up?

Answer 1

For using Delve debugger in Visual Studio Code with Golang, do the following steps:

( Note: for Windows OS replace all $GOPATH with %GOPATH% )

• Install Latest Golang and set GOROOT and GOPATH
• Add $GOPATH/bin to your OS PATH environment variable.
• set environment variable: GO15VENDOREXPERIMENT = 1
• run: go get github.com/derekparker/delve/cmd/dlv and make sure dlv binary generated in your $GOPATH/bin
• Install Visual Studio Code
• Launch VS Code Quick Open (Ctrl+P), paste this command: ext install Go , and press enter.
• click install Rich Go language support for Visual Studio Code
• click Enable and restart Visual Studio Code
• Inside Visual Studio Code Open Folder Ctrl+Shift+E , e.g.: $GOPATH\src\hello\
• Then Open hello.go from that folder (or make new file Ctrl+N and save it on this folder):

package main

import "fmt"

func main() {
    fmt.Println("Hello World!")
    i := 101
    fmt.Println(i)
}

• Then Open Debugger Ctrl+Shift+D
• on this line: i := 101 press F9 to set or toggle beakpoint.
• Press F5 to start debugging or to Run the application, if asked to select environment: select Go.
• Press F10 to Step Over.
• Press F11 to Step Into.
• Press Shift+F11 to Step Out.
• Press Shift+F5 to Stop Debugging.
• Press Ctrl+Shift+F5 to Restart Debugging.

My launch.json untouched:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch",
            "type": "go",
            "request": "launch",
            "mode": "debug",
            "remotePath": "",
            "port": 2345,
            "host": "127.0.0.1",
            "program": "${workspaceRoot}",
            "env": {},
            "args": [],
            "showLog": true
        }
    ]
}

Result:

Answer 2

FTA (in case it is hard to find), if when using delve and you get cannot find package error even though your GOPATH is set correctly, check out this bug of vscode-go, it is affecting both MAC OS and Linux, as of October, 2017.

The solution is posted there as well:

... adding the GOPATH as an env var in the env property in the launch.json file solved the problem

Answer 3

Content launch.json for gdb and delve

{
// Используйте IntelliSense, чтобы узнать о возможных атрибутах.
// Наведите указатель мыши, чтобы просмотреть описания существующих атрибутов.
// Для получения дополнительной информации посетите: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
    {
        "name": "Delve",
        "type": "go",
        "request": "launch",
        "mode": "debug",
        "remotePath": "",
        "port": 2345,
        "host": "127.0.0.1",
        "program": "${workspaceRoot}/src/hello/hello.go",
        "env": {},
        "args": [],
        "showLog": true
    }
   ,
    {
        "type": "gdb",
        "request": "launch",
        "name": "GDB",

        "target": "${workspaceRoot}/src/hello/hello",
        "cwd": "${workspaceRoot}",
        "linux": {
            "MIMode": "gdb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ]
        },
    }
]

}