golang 调试工具 dlv

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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