golang 调试篇 一、go delve 使用

一、安装  参考文档 https://github.com/go-delve/delve/blob/master/Documentation/installation/linux/install.md

二、使用

1. go build hello.go 生成二进制文件 hello

dlv exec ./hello -- server --config conf/config.toml

break main.go:52

(dlv) break main.go:52
Breakpoint 1 set at 0x109b901 for main.main() ./main.go:52

(dlv) bp
Breakpoint runtime-fatal-throw at 0x1028450 for runtime.fatalthrow() /usr/local/go/src/runtime/panic.go:663 (0)
Breakpoint unrecovered-panic at 0x10284c0 for runtime.fatalpanic() /usr/local/go/src/runtime/panic.go:690 (0)
	print runtime.curg._panic.arg
Breakpoint 1 at 0x109b901 for main.main() ./main.go:52 (0)


(dlv) c
> main.main() ./main.go:52 (hits goroutine(1):1 total:1) (PC: 0x109b901)
Warning: debugging optimized function
    47:		return n
    48:	}
    49:	
    50:	func main() {
    51:		// Create the network
=>  52:		net := NewGreetingApp()
    53:		// We need a channel to talk to it
    54:		in := make(chan string)
    55:		net.SetInPort("In", in)
    56:		// Run the net
    57:		wait := goflow.Run(net)

(dlv) b +2     //偏移量2加断点
Breakpoint 2 set at 0x109b90f for main.main() ./main.go:54

(dlv) next    //下一个断点
> main.main() ./main.go:54 (hits goroutine(1):1 total:1) (PC: 0x109b90f)
Warning: debugging optimized function
    49:	
    50:	func main() {
    51:		// Create the network
    52:		net := NewGreetingApp()
    53:		// We need a channel to talk to it
=>  54:		in := make(chan string)
    55:		net.SetInPort("In", in)
    56:		// Run the net
    57:		wait := goflow.Run(net)
    58:		// Now we can send some names and see what happens
    59:		in <- "John"

(dlv) n
> main.main() ./main.go:55 (PC: 0x10c1d82)
    50:	func main() {
    51:		// Create the network
    52:		net := NewGreetingApp()
    53:		// We need a channel to talk to it
    54:		in := make(chan string)
=>  55:		net.SetInPort("In", in)
    56:		// Run the net
    57:		wait := goflow.Run(net)
    58:		// Now we can send some names and see what happens
    59:		in <- "John"
    60:		in <- "Boris"

(dlv) p in  //打印变量
chan string {
	qcount: 0,
	dataqsiz: 0,
	buf: *[0]string [],
	elemsize: 16,
	closed: 0,
	elemtype: *runtime._type {
		size: 16,
		ptrdata: 8,
		hash: 3774831796,
		tflag: tflagUncommon|tflagExtraStar|tflagNamed (7),
		align: 8,
		fieldalign: 8,
		kind: 24,
		alg: *(*runtime.typeAlg)(0x11ae170),
		gcdata: *1,
		str: 7020,
		ptrToThis: 60992,},
	sendx: 0,
	recvx: 0,
	recvq: waitq<string> {
		first: *sudog<string> nil,
		last: *sudog<string> nil,},
	sendq: waitq<string> {
		first: *sudog<string> nil,
		last: *sudog<string> nil,},
	lock: runtime.mutex {key: 0},}

Commands

Command	Description
args	Print function arguments.
break	Sets a breakpoint.
breakpoints	Print out info for active breakpoints.
call	Resumes process, injecting a function call (EXPERIMENTAL!!!)
check	Creates a checkpoint at the current position.
checkpoints	Print out info for existing checkpoints.
clear	Deletes breakpoint.
clear-checkpoint	Deletes checkpoint.
clearall	Deletes multiple breakpoints.
condition	Set breakpoint condition.
config	Changes configuration parameters.
continue	Run until breakpoint or program termination.
deferred	Executes command in the context of a deferred call.
disassemble	Disassembler.
down	Move the current frame down.
edit	Open where you are in $DELVE_EDITOR or $EDITOR
exit	Exit the debugger.
frame	Set the current frame, or execute command on a different frame.
funcs	Print list of functions.
goroutine	Shows or changes current goroutine
goroutines	List program goroutines.
help	Prints the help message.
libraries	List loaded dynamic libraries
list	Show source code.
locals	Print local variables.
next	Step over to next source line.
on	Executes a command when a breakpoint is hit.
print	Evaluate an expression.
regs	Print contents of CPU registers.
restart	Restart process from a checkpoint or event.
rev	Reverses the execution of the target program for the command specified.
rewind	Run backwards until breakpoint or program termination.
set	Changes the value of a variable.
source	Executes a file containing a list of delve commands
sources	Print list of source files.
stack	Print stack trace.
step	Single step through program.
step-instruction	Single step a single cpu instruction.
stepout	Step out of the current function.
thread	Switch to the specified thread.
threads	Print out info for every traced thread.
trace	Set tracepoint.
types	Print list of types
up	Move the current frame up.
vars	Print package variables.
whatis	Prints type of an expression.

• dlv attach - Attach to running process and begin debugging.

• dlv connect - Connect to a headless debug server.

• dlv core - Examine a core dump.

• dlv debug - Compile and begin debugging main package in current directory, or the package specified.

• dlv exec - Execute a precompiled binary, and begin a debug session.

• dlv replay - Replays a rr trace.

• dlv run - Deprecated command. Use 'debug' instead.

• dlv test - Compile test binary and begin debugging program.

• dlv trace - Compile and begin tracing program.

• dlv version - Prints version.

• dlv log - Help about logging flags

• dlv backend - Help about the --backend flag