Debugger Statementについて

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Debugger Statement

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Name @brn (ꫬꅿ⨳ⵃ) Occupation ؿٗٝزؒٝسؒٝآص،٥ط؎ذ؍ـؒٝآص، Company Cyberagent ،سذؙأةآؔ AI Messenger OSS Contributor of V8 About http://info.b6n.ch

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

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

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In V8 BytecodeהJIT؝٦سדⰟ鸐ךⳢ椚׾遤ֲ

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

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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

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

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

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

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

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

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

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const log = (v) => {! debugger { group: 'logging' };! console.log(v);! };!

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const route = (httpRequest) => {! debugger {! test: () => httpRequest.tracing || !isProduction! };! console.log(v);! };!

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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嶊ִ׷