Debugger Statementについて

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1. Debugger Statement
   

2. Name @brn (ꫬꅿ⨳ⵃ) Occupation ؿٗٝزؒٝسؒٝآص،٥ط؎ذ؍ـؒٝآص، Company Cyberagent ،سذؙأةآؔ AI Messenger

   OSS Contributor of V8 About http://info.b6n.ch

3. What is debugger?
   debugger statementהכ؝٦س⚥ח剅ֻֿהדرغحؖ׾饯⹛׃ـ ٖ؎ؙ׃גֻ׸׷堣腉
   

4. const ret = foo()! if (ret) {! debugger;! }!

5. None

6. In V8
   BytecodeהJIT؝٦سדⰟ鸐ךⳢ椚׾遤ֲ

7. Bytecode
   DebuggerعٝسָٓDebuggerغ؎ز؝٦س׾鋅אֽ׷ה Runtime_HandleDebuggerStatement׾ㄎן⳿׃גծ✲⵸ח涫 ꐮׁ׸גְ׷؝٦ٕغحؙ׾ㄎן⳿ׅ In V8
   

8. JIT Code
   JIT⻉ך麓玎דㄏ⟀ך⽃秪⻉הְֲ剑黝⻉ָ遤׻׸׷ָծ׉ך麓 玎דDebugger Statementכ⯓玎ך Runtime_HandleDebuggerStatementㄎן⳿׃ך؝٦سפה湫 䱸㢌䳔ׁ׸׷ In V8
   

9. Break Point
   אְדזךדBreakpointחאְג ـٓؐؠך؎ٝألؙةַ׵䭷㹀ׅ׷ֿהָדֹ׷ •  In V8

10. None

11. In V8
    DebugBreakכDebugger Statementה麩׏גוֿח䯏Ⰵׁ׸׷ַ ׻ַ׵זְךד✲⵸חRuntime_HandleDebuggerStatementהַח כ㢌䳔דֹזְ
    

12. Bytecode
    DebugBreakعٝسָٓDebug::HandleDebugBreak׾ㄎן⳿׃ גծ穠卓Debugger StatementהずׄⳢ椚׾遤ֲ
    In V8
    

13. JIT Code(X64)
    ـٖ؎ؙه؎ٝزכׅץגInt3ㄏ⟀ָ涪遤ׁ׸גSIGTRAP׾䒷ֹ 饯ֿׅ interruptָ饯ֿ׷הStackGuard::HandleInterruptsָㄎן⳿ׁ׸ גծ׉ַֿ׵Debug::HandleDebugBreakפ
    In V8
    

14. Future
    ⯓傈ךTC39 Meetingדproposal-debugger-operandָStage1ח ז׏׋
    

15. proposal-debugger-operand
    ـٖ؎ؙه؎ٝزךؚٕ٦ف⻉ח״׷♧俕ON/OFFծ勴⟝➰ֹـ ٖ؎ؙך鏣㹀瘝ָ遤ִ׷ Future
    

16. const log = (v) => {! debugger { group: 'logging'

    };! console.log(v);! };!

17. const route = (httpRequest) => {! debugger {! test: ()

    => httpRequest.tracing || !isProduction! };! console.log(v);! };!

18. 㹋騧
    Ꟛ涪儗חכDebugger׾㙵׭鴥׿דծٔٔ٦أ儗ח嶊ׅ Webpack׾⢪׏ג׷ז׵Uglifyָ嶊׃גֻ׸׷ v4ך㜥さכmode productionד⹧䩛ח嶊ִ׷
    

19. class Logger {! fatal() {! console.error("Error");! debugger;! }! }!

20. תה׭
    ⢪׏ג׷➂㼰זְ⽩韋דָׅꟚ涪儗ח⢪ֲה穠圓嚂דׅ