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Debugger Statementについて
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Taketoshi Aono(青野健利 a.k.a brn)
March 20, 2018
Programming
1
540
Debugger Statementについて
Debugger Statementの紹介と使い方
proposal-debugger-operandsについて
Taketoshi Aono(青野健利 a.k.a brn)
March 20, 2018
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Transcript
Debugger Statement
Name @brn (ꫬꅿ⨳ⵃ) Occupation ؿٗٝزؒٝسؒٝآص،٥ط؎ذ؍ـؒٝآص، Company Cyberagent ،سذؙأةآؔ AI Messenger
OSS Contributor of V8 About http://info.b6n.ch
What is debugger? debugger statementהכ؝٦س⚥ח剅ֻֿהדرغحؖ饯⹛׃ـ ٖ؎ؙ׃גֻ堣腉
const ret = foo()! if (ret) {! debugger;! }!
None
In V8 BytecodeהJIT؝٦سדⰟ鸐ךⳢ椚遤ֲ
Bytecode DebuggerعٝسָٓDebuggerغ؎ز؝٦س鋅אֽה Runtime_HandleDebuggerStatementㄎן⳿׃גծ✲ח涫 ꐮׁגְ؝٦ٕغحؙㄎן⳿ׅ In V8
JIT Code JIT⻉ך麓玎דㄏ⟀ך⽃秪⻉הְֲ剑黝⻉ָ遤ָծך麓 玎דDebugger Statementכ⯓玎ך Runtime_HandleDebuggerStatementㄎן⳿׃ך؝٦سפה湫 䱸㢌䳔ׁ In V8
Break Point אְדזךדBreakpointחאְג ـٓؐؠך؎ٝألؙةַ䭷㹀ֿׅהָדֹ • In V8
None
In V8 DebugBreakכDebugger Statementה麩גוֿח䯏Ⰵַׁ ַזְךד✲חRuntime_HandleDebuggerStatementהַח כ㢌䳔דֹזְ
Bytecode DebugBreakعٝسָٓDebug::HandleDebugBreakㄎן⳿׃ גծ穠卓Debugger StatementהずׄⳢ椚遤ֲ In V8
JIT Code(X64) ـٖ؎ؙه؎ٝزכׅץגInt3ㄏ⟀ָ涪遤ׁגSIGTRAP䒷ֹ 饯ֿׅ interruptָ饯ֿהStackGuard::HandleInterruptsָㄎן⳿ׁ גծַֿDebug::HandleDebugBreakפ In V8
Future ⯓傈ךTC39 Meetingדproposal-debugger-operandָStage1ח ז
proposal-debugger-operand ـٖ؎ؙه؎ٝزךؚٕ٦ف⻉ח״♧俕ON/OFFծ勴⟝➰ֹـ ٖ؎ؙך鏣㹀瘝ָ遤ִ Future
const log = (v) => {! debugger { group: 'logging'
};! console.log(v);! };!
const route = (httpRequest) => {! debugger {! test: ()
=> httpRequest.tracing || !isProduction! };! console.log(v);! };!
㹋騧 涪儗חכDebugger㙵鴥דծٔٔ٦أ儗ח嶊ׅ Webpack⢪גזUglifyָ嶊׃גֻ v4ך㜥さכmode productionד䩛ח嶊ִ
class Logger {! fatal() {! console.error("Error");! debugger;! }! }!
תה ⢪ג➂㼰זְ⽩韋דָׅ涪儗ח⢪ֲה穠圓嚂דׅ