package main
import "fmt"
// dlv 断点调试法
/*
下载安装：
go get -u github.com/derekparker/delve/cmd/dlv
使用：
(base) ➜ dlv dlv debug ./learn2.go
Type 'help' for list of commands.
(dlv) help
The following commands are available:
args ------------------------ Print function arguments.
break (alias: b) ------------ Sets a breakpoint.
breakpoints (alias: bp) ----- Print out info for active breakpoints.
call ------------------------ Resumes process, injecting a function call (EXPERIMENTAL!!!)
clear ----------------------- Deletes breakpoint.
clearall -------------------- Deletes multiple breakpoints.
condition (alias: cond) ----- Set breakpoint condition.
config ---------------------- Changes configuration parameters.
continue (alias: c) --------- Run until breakpoint or program termination.
deferred -------------------- Executes command in the context of a deferred call.
disassemble (alias: disass) - Disassembler.
down ------------------------ Move the current frame down.
edit (alias: ed) ------------ Open where you are in $DELVE_EDITOR or $EDITOR
exit (alias: quit | q) ------ Exit the debugger.
frame ----------------------- Set the current frame, or execute command on a different frame.
funcs ----------------------- Print list of functions.
goroutine (alias: gr) ------- Shows or changes current goroutine
goroutines (alias: grs) ----- List program goroutines.
help (alias: h) ------------- Prints the help message.
libraries ------------------- List loaded dynamic libraries
list (alias: ls | l) -------- Show source code.
locals ---------------------- Print local variables.
next (alias: n) ------------- Step over to next source line.
on -------------------------- Executes a command when a breakpoint is hit.
print (alias: p) ------------ Evaluate an expression.
regs ------------------------ Print contents of CPU registers.
restart (alias: r) ---------- Restart process.
set ------------------------- Changes the value of a variable.
source ---------------------- Executes a file containing a list of delve commands
sources --------------------- Print list of source files.
stack (alias: bt) ----------- Print stack trace.
step (alias: s) ------------- Single step through program.
step-instruction (alias: si) Single step a single cpu instruction.
stepout --------------------- Step out of the current function.
thread (alias: tr) ---------- Switch to the specified thread.
threads --------------------- Print out info for every traced thread.
trace (alias: t) ------------ Set tracepoint.
types ----------------------- Print list of types
up -------------------------- Move the current frame up.
vars ------------------------ Print package variables.
whatis ---------------------- Prints type of an expression.
Type help followed by a command for full documentation.
以上为全部命令， 常用的有一下几个：
b 打断点
eg:
b main.main 或者使用文件:行号来打断点
p 打印：
eg:
p a 打印a变量
n: 执行到下一行
c: 跳过此断点
args: 打印所有的方法参数
locals 打印出所有的本地变量
l 列出断点最近几行的代码
bp: 展示出所有的断点
q: 退出
*/
func main() {
a := []string{"a", "b", "c", "D", "ef"}
for k, v := range a {
fmt.Println(k, v)
}
}
使用示例
(base) ➜ dlv dlv debug ./learn2.go
Type 'help' for list of commands.
(dlv) b main.main
Breakpoint 1 set at 0x4a243b for main.main() ./learn2.go:67
(dlv) c
> main.main() ./learn2.go:67 (hits goroutine(1):1 total:1) (PC: 0x4a243b)
62: c: 跳过此断点
63: args: 打印所有的方法参数
64: locals 打印出所有的本地变量
65: */
66:
=> 67: func main() {
68: a := []string{"a", "b", "c", "D", "ef"}
69: for k, v := range a {
70: fmt.Println(k, v)
71: }
72: }
(dlv) l
> main.main() ./learn2.go:67 (hits goroutine(1):1 total:1) (PC: 0x4a243b)
62: c: 跳过此断点
63: args: 打印所有的方法参数
64: locals 打印出所有的本地变量
65: */
66:
=> 67: func main() {
68: a := []string{"a", "b", "c", "D", "ef"}
69: for k, v := range a {
70: fmt.Println(k, v)
71: }
72: }
(dlv) b 70
Breakpoint 2 set at 0x4a253c for main.main() ./learn2.go:70
(dlv) bp
Breakpoint runtime-fatal-throw at 0x42c4a0 for runtime.fatalthrow() /home/yz/go/src/runtime/panic.go:663 (0)
Breakpoint unrecovered-panic at 0x42c510 for runtime.fatalpanic() /home/yz/go/src/runtime/panic.go:690 (0)
print runtime.curg._panic.arg
Breakpoint 1 at 0x4a243b for main.main() ./learn2.go:67 (1)
Breakpoint 2 at 0x4a253c for main.main() ./learn2.go:70 (0)
(dlv) c
> main.main() ./learn2.go:70 (hits goroutine(1):1 total:1) (PC: 0x4a253c)
Warning: listing may not match stale executable
65: l 列出断点最近几行的代码
66: bp: 展示出所有的断点
67:
68:
69: */
=> 70:
71: func main() {
72: a := []string{"a", "b", "c", "D", "ef"}
73: for k, v := range a {
74: fmt.Println(k, v)
75: }
(dlv) p k
0
(dlv) p v
"a"
(dlv) n
0 a
> main.main() ./learn2.go:69 (PC: 0x4a261b)
Warning: listing may not match stale executable
64: locals 打印出所有的本地变量
65: l 列出断点最近几行的代码
66: bp: 展示出所有的断点
67:
68:
=> 69: */
70:
71: func main() {
72: a := []string{"a", "b", "c", "D", "ef"}
73: for k, v := range a {
74: fmt.Println(k, v)
(dlv) p k
0
(dlv) n
> main.main() ./learn2.go:70 (hits goroutine(1):2 total:2) (PC: 0x4a253c)
Warning: listing may not match stale executable
65: l 列出断点最近几行的代码
66: bp: 展示出所有的断点
67:
68:
69: */
=> 70:
71: func main() {
72: a := []string{"a", "b", "c", "D", "ef"}
73: for k, v := range a {
74: fmt.Println(k, v)
75: }
(dlv) n
1 b
> main.main() ./learn2.go:69 (PC: 0x4a261b)
Warning: listing may not match stale executable
64: locals 打印出所有的本地变量
65: l 列出断点最近几行的代码
66: bp: 展示出所有的断点
67:
68:
=> 69: */
70:
71: func main() {
72: a := []string{"a", "b", "c", "D", "ef"}
73: for k, v := range a {
74: fmt.Println(k, v)
(dlv) p k
1
(dlv) p v
"b"
(dlv) c
> main.main() ./learn2.go:70 (hits goroutine(1):3 total:3) (PC: 0x4a253c)
Warning: listing may not match stale executable
65: l 列出断点最近几行的代码
66: bp: 展示出所有的断点
67:
68:
69: */
=> 70:
71: func main() {
72: a := []string{"a", "b", "c", "D", "ef"}
73: for k, v := range a {
74: fmt.Println(k, v)
75: }
(dlv) c
2 c
> main.main() ./learn2.go:70 (hits goroutine(1):4 total:4) (PC: 0x4a253c)
Warning: listing may not match stale executable
65: l 列出断点最近几行的代码
66: bp: 展示出所有的断点
67:
68:
69: */
=> 70:
71: func main() {
72: a := []string{"a", "b", "c", "D", "ef"}
73: for k, v := range a {
74: fmt.Println(k, v)
75: }
(dlv) c
3 D
> main.main() ./learn2.go:70 (hits goroutine(1):5 total:5) (PC: 0x4a253c)
Warning: listing may not match stale executable
65: l 列出断点最近几行的代码
66: bp: 展示出所有的断点
67:
68:
69: */
=> 70:
71: func main() {
72: a := []string{"a", "b", "c", "D", "ef"}
73: for k, v := range a {
74: fmt.Println(k, v)
75: }
(dlv) c
4 ef
Process 16382 has exited with status 0
(dlv) q
Process 16382 has exited with status 0
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