delve调试运行时go程序

环境和代码参考gdb调试篇

delve是go官方推荐的一个调试器，由go语言开发，也被很多代码编辑器集成为debug的插件，比如goland，vscode
官方文档戳这里

程序例子

环境和代码参考gdb调试篇

delve安装

delve安装参考环境安装篇

调试go运行时程序

• 启动程序
  go run test.go 或 go build -o test test.go
• 调试程序
  • 连接运行时程序

    dlv attach `ps aux|grep test|grep -v "grep"|awk  '{print $2}'`
    

  • 查看当前进程所有线程信息(即MPG中的M)

    (dlv) threads
    * Thread 130 at 0x45f0a3 .usr/local/go/src/runtime/sys_linux_amd64.s:536 runtime.futex
    ......
        Thread 136 at 0x45f250 .usr/local/go/src/runtime/sys_linux_amd64.s:675 runtime.epollwait
    

  • 切换线程

    (dlv) thread 135
    Switched from 130 to 135
    

  • 查看当前线程栈详细信息

    (dlv) stack
    0  0x000000000045f0a3 in runtime.futex at .usr/local/go/src/runtime/sys_linux_amd64.s:536
       ......
    7  0x0000000000401893 in ??? at ?:-1
    

  • 查看当前线程运行栈中的某一个函数信息

    (dlv) frame 1
    > runtime.futex() .usr/local/go/src/runtime/sys_linux_amd64.s:536 (PC: 0x45f0a3)
    Warning: debugging optimized function
    Frame 1: .usr/local/go/src/runtime/os_linux.go:63 (PC: 42c4b2)
    58:           ts.set_nsec(int32(ns % 1000000000))
    59:       } else {
    60:           ts.tv_nsec = 0
    61:           ts.set_sec(int64(timediv(ns, 1000000000, (*int32)(unsafe.Pointer(&ts.tv_nsec)))))
    62:       }
    =>  63:     futex(unsafe.Pointer(addr), _FUTEX_WAIT_PRIVATE, val, unsafe.Pointer(&ts), nil, 0)
    64:   }
    65:
    66:   // If any procs are sleeping on addr, wake up at most cnt.
    67:   //go:nosplit
    68:   func futexwakeup(addr *uint32, cnt uint32) {
    

  • 查看所有的协程

    (dlv) goroutines #或者grs
      Goroutine 1 - User: .root/go/src/github.com/saileifeng/go-socket-test/example/test/test.go:41 main.ShutDownHook (0x735829)
      Goroutine 2 - User: .usr/local/go/src/runtime/proc.go:302 runtime.gopark (0x43036f)
      Goroutine 3 - User: .usr/local/go/src/runtime/proc.go:302 runtime.gopark (0x43036f)
      Goroutine 4 - User: .usr/local/go/src/runtime/proc.go:302 runtime.gopark (0x43036f)
      Goroutine 6 - User: .usr/local/go/src/runtime/proc.go:302 runtime.gopark (0x43036f)
      Goroutine 18 - User: .usr/local/go/src/runtime/sigqueue.go:139 os/signal.signal_recv (0x44450c)
      Goroutine 19 - User: .usr/local/go/src/runtime/netpoll.go:182 internal/poll.runtime_pollWait (0x42b0a6)
      Goroutine 20 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 21 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 22 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 23 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 24 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 25 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 26 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 27 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 28 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 29 - User: .usr/local/go/src/runtime/sema.go:71 sync.runtime_SemacquireMutex (0x4402ad)
      Goroutine 30 - User: .usr/local/go/src/runtime/proc.go:302 runtime.gopark (0x43036f)
      Goroutine 31 - User: .usr/local/go/src/runtime/proc.go:302 runtime.gopark (0x43036f)
    [19 goroutines]
    

  • 切换协程

    (dlv) goroutine 1   #或者gr 1
    Switched from 0 to 1 (thread 131) #可以看到当前协程是在131线程上被运行
    

  • 查看协程栈信息

    (dlv) goroutine 1 stack #或者直接stack
    0  0x000000000043036f in runtime.gopark
       at .usr/local/go/src/runtime/proc.go:302
    1  0x00000000004075a0 in runtime.goparkunlock
       at .usr/local/go/src/runtime/proc.go:307
    2  0x00000000004075a0 in runtime.chanrecv
       at .usr/local/go/src/runtime/chan.go:524
    3  0x000000000040727b in runtime.chanrecv1
       at .usr/local/go/src/runtime/chan.go:406
    4  0x0000000000735829 in main.ShutDownHook
       at .root/go/src/github.com/saileifeng/go-socket-test/example/test/test.go:41
    5  0x0000000000735747 in main.main
       at .root/go/src/github.com/saileifeng/go-socket-test/example/test/test.go:34
    6  0x000000000042ff7c in runtime.main
       at .usr/local/go/src/runtime/proc.go:200
    7  0x000000000045d241 in runtime.goexit
       at .usr/local/go/src/runtime/asm_amd64.s:1337
    

  • 查看协程栈中运行的函数详细信息

    (dlv) gr 1 frame 4
    

待续......