Delve

What is Delve?

Delve is a Go debugger, written in Go.

Building

Currently, Delve requires the following patch, however this change is vendored until Go 1.4 lands, so the project is go get-able.

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

You will need readline installed on your system. With apt simply: sudo apt-get install libreadline-dev .

Features

• Attach to an already running process
• Launch a process and begin debug session
• Set breakpoints, single step, step over functions, print variable contents, print thread and goroutine information

Usage

The debugger can be launched in three ways:

• Compile, run, and attach in one step:

  $ dlv -run
  

• Provide the name of the program you want to debug, and the debugger will launch it for you.

  $ dlv path/to/program
  

• Provide the pid of a currently running process, and the debugger will attach and begin the session.

  $ sudo dlv -pid 44839
  

Breakpoints

Delve can insert breakpoints via the breakpoint command once inside a debug session, however for ease of debugging, you can also call runtime.Breakpoint() and Delve will handle the breakpoint and stop the program at the next source line.

Commands

Once inside a debugging session, the following commands may be used:

• break - Set break point at the entry point of a function, or at a specific file/line. Example: break foo.go:13.

• continue - Run until breakpoint or program termination.

• step - Single step through program.

• next - Step over to next source line.

• threads - Print status of all traced threads.

• goroutines - Print status of all goroutines.

• print $var - Evaluate a variable.

• exit - Exit the debugger.

Upcoming features

• In-scope variable setting
• Support for OS X
• Editor integration

License

MIT