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.

Features

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

Usage

The debugger can be launched in three ways:

• Compile, run, and attach in one step:

  $ delve -run
  

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

  $ delve -proc path/to/program
  

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

  $ sudo delve -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 the status of all traced goroutines.

• goroutines - Print status of all goroutines.

• print $var - Evaluate a variable.

Upcoming features

• In-scope variable setting
• Support for OS X

License

MIT