使用VSCode对Golang程序进行调试时会遇到数据截断问题,string只显示前64个字符,array只显示前64个数据。经查dlv是支持以参数方式来控制的。
发现VSCode的Golang插件里面有个叫做go.delveConfig
的配置,是可以设置dlv参数的。分享一下我的整个Golang配置:
"go.buildOnSave": "off", "go.formatTool": "goimports", "go.lintTool": "golangci-lint", //go get -u github.com/golangci/golangci-lint/cmd/golangci-lint "go.autocompleteUnimportedPackages": true, "go.gotoSymbol.includeImports": true, "go.useLanguageServer": true, "go.delveConfig": { "dlvLoadConfig": { "followPointers": true, "maxVariableRecurse": 3, "maxStringLen": 1024, "maxArrayValues": 1024, "maxStructFields": -1 }, }, "[go]": { "editor.formatOnSave": true, "editor.codeActionsOnSave": { "source.organizeImports": true } },
需要改的主要是maxStringLen
、maxArrayValues
、maxVariableRecurse
这三个字段。
参考:https://stackoverflow.com/questions/52416263/how-do-i-print-the-full-value-of-a-string-variable-in-delve
ps:下面看下Golang dlv 工具debug 调试注意项
总结一下关于Go 的调试工具dlv:https://github.com/derekparker/delve 的使用注意项。
安装:
go get -u github.com/go-delve/delve/cmd/dlv
配置:
以Centos为例
export GOROOT=/usr/lib/golang export GOPATH=$HOME/go export PATH=$PATH:$GOPATH/bin
使用
以某go服务为例:
dlv debug xxx.go
指定需要debug的文件- 进入dlv交互式窗口后,
b <filename>:<line>
指定断点 - r arg 指定运行参数
- n 执行一行
- c 运行至断点或程序结束
dlv debug /home/xxx/server.go (dlv) b /home/xxx/server.go:258 (dlv) r 1 (dlv) n (dlv) c
注意: b <filename>:<line>
指定断点时,若该行号对应的代码内容为无具体语义的代码(括号、注释等),则会报错:
Command failed: could not find /home/xxx/server.go:258
此时可用list 命令先查看上下文代码,避免将无具体语义的代码设为断点。
命令集
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 ------------------- Shows or changes current goroutine
goroutines ------------------ List program goroutines.
help (alias: h) ------------- Prints the help message.
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.
总结
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