使用VSCode對(duì)Golang程序進(jìn)行調(diào)試時(shí)會(huì)遇到數(shù)據(jù)截?cái)鄦栴},string只顯示前64個(gè)字符,array只顯示前64個(gè)數(shù)據(jù)。經(jīng)查dlv是支持以參數(shù)方式來控制的。
發(fā)現(xiàn)VSCode的Golang插件里面有個(gè)叫做go.delveConfig
的配置,是可以設(shè)置dlv參數(shù)的。分享一下我的整個(gè)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
這三個(gè)字段。
參考: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 調(diào)試注意項(xiàng)
總結(jié)一下關(guān)于Go 的調(diào)試工具dlv:https://github.com/derekparker/delve 的使用注意項(xiàng)。
安裝:
go get -u github.com/go-delve/delve/cmd/dlv
配置:
以Centos為例
export GOROOT=/usr/lib/golang
export GOPATH=$HOME/go
export PATH=$PATH:$GOPATH/bin
使用
以某go服務(wù)為例:
dlv debug xxx.go
指定需要debug的文件
- 進(jìn)入dlv交互式窗口后,
b filename>:line>
指定斷點(diǎn)
- r arg 指定運(yùn)行參數(shù)
- n 執(zhí)行一行
- c 運(yùn)行至斷點(diǎn)或程序結(jié)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>
指定斷點(diǎn)時(shí),若該行號(hào)對(duì)應(yīng)的代碼內(nèi)容為無具體語義的代碼(括號(hào)、注釋等),則會(huì)報(bào)錯(cuò):
Command failed: could not find /home/xxx/server.go:258
此時(shí)可用list 命令先查看上下文代碼,避免將無具體語義的代碼設(shè)為斷點(diǎn)。
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.
總結(jié)
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