はじめてのconsole.log

by Edward Fox

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͸͡Ίͯͷconsole.log EDWARD FOX @Meguro.es 2017/02/07

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Edward Fox - Developer @ Repro Inc. - RoR, JavaScript, AWS - Vue.js, HTTP/2, WebAssembly

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ಥવͰ͕͢Έͳ͞Μ

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console.logɺͯ͠·͔͢ʁ

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JSΛॻ͘ਓͰ console.logΛ࣮ߦͨ͜͠ͱ ͕ͳ͍ਓ͸͍ͳ͍Ͱ͢ΑͶ

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ࠓ೔࿩͢͜ͱ

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consoleΦϒδΣΫτͷ ศརؔ਺ʹ͍ͭͯ

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- console.tableͱ͔ - console.proﬁleͱ͔

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৭ʑ͋ΔͷͰάά͍ͬͯͩ͘͞

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͓ΘΓ

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Ͱ͸ͳ͘

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ϒϥ΢βͷΠϯεϖΫλʹ console.log(‘foo’)ͱೖྗͯ͠ ͔Βɺfooͱग़ྗ͞ΕΔ·Ͱ

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ௐ΂Δํ๏

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1.ϒϥ΢βͷιʔείʔυಡΉ 2. ϒϥ΢βΛࣗલͰίϯύΠϧ ͯ͠ɺεςοϓ࣮ߦͯ͠௥͏

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1.ϒϥ΢βͷιʔείʔυಡΉ 2. ϒϥ΢βΛࣗલͰίϯύΠϧ ͯ͠ɺεςοϓ࣮ߦͯ͠௥͏

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ର৅͸WebKit ʢͷϛϥʔϦϙδτϦʣ https://github.com/WebKit/ webkit

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C++ॳ৺ऀ͕งғؾͰಡΜ ͩͷͰɺؒҧ͍ͬͯͨΒڭ ͍͑ͯͩ͘͞ && ͍ͩͿ୺ં͍ͬͯΔͷ Ͱɺͦͷล͸͝צหΛ

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ۦ͚଍Ͱ͍͖·͢

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Ͳ͔͜ΒಡΉ΂͖͔ Θ͔Βͳ͍

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ೖྗΛड͚औΔʹ΋ ΠϯεϖΫλͷUI͕ඞཁ

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WebInspectorUI

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jsͰॻ͔Ε͍ͯΔ͔Β ׂͱαΫαΫಡΊΔ

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ConsoleObserver͕ ϢʔβʔͷೖྗΛ ؂ࢹ͍ͯ͠Δ

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ೖྗΛؔ஌͢Δͱ LogManagerʹॲཧΛҕৡ

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LogManager.messageWasAdded()

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͜ͷmessageΛड͚औΔ ΠϯλʔϓϦλʔ͕͍Δ ͦͷ໊΋Interpreter

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Interpreter͔Βઌ͸ C++Ͱॻ͔Εͨ ϒϥ΢βͷωΠςΟϒ࣮૷

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Interpreter͸ UI͔ΒͷೖྗΛ callFrameͱͯ͠଴ͬͯΔ

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callFrame = InterpreterΛ ίʔϧͨ͠ɺJSͷίʔυ΍ ͦͷ࣮ߦ؀ڥͳͲ

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InterpreterͰ͸ɺevalؔ਺͕ callFrameΛड͚औͬͯධՁ JSValueܕͷ஋Λฦ͢

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͜ͷͱ͖ ࣮ߦ؀ڥͷείʔϓʹ΋ͱ͍ͮͨ LexicalGlobalObjectͳͲ΋ੜ੒ strict modeͰͷ࣮ߦͱ͔΋ ͜ͷ࣌఺Ͱ൑ผͯ͠ॲཧΛม͑Δ

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console.logͱ͍͏ JSͷίʔυΛC++ͷؔ਺ʹ Ϛοϐϯάͯ͠ ࣮ߦ͢Δඞཁ͕͋Δ

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େྔͷϚΫϩ

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putDirectNativeFunction- WithoutTransition()

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JSίʔυͷ࣮ߦঢ়ଶΛࣔ͢ ExecStateΛ΋ͱʹ࣮ߦ

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JSC_HOST_CALLͱ͍͏ ϚΫϩ͕͋Δ if CPU(X86) && COMPILER(GCC_OR_CLANG) Έ͍ͨͳίʔυ΋͋ͬͯ ຯΘ͍ਂ͍

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͔͜͜Βઌ͸ ConsoleObjectΫϥε ͷίʔυΛ௥͍·͢

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͞Βʹۦ͚଍Ͱ

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consoleProtoFuncLog()

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consoleLogWithLevel()

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logWithLevel()

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messageWithTypeAndLevel()

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WTFLogAlways()

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vprintf_stderr_with_trailing_ newline()

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ʢϝιου໊ͷงғؾ͕ มΘͬͨ…ʁʣ

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vprintf_stderr_common()

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logToStderr()

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fputs()

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…!!!

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ʹ͡Έग़Δ ௿ϨΠϠʔײ

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͕͜͜࠷ਂ෦͔ʁ

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fputs()ͷ࣮૷͸ WebKitʹͳ͍

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C++ʹ༻ҙ͞Ε͍ͯΔؔ਺

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> ϑΝΠϧϙΠϯλfpʹ จࣈྻstrΛग़ྗͯ͠ ੒ޭ͢Ε͹ෛͰ͸ແ͍஋Λ ΤϥʔͰ͋Ε͹EOF(-1)Λฦ͢

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ͭ·Γ

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fputs()͢Δͱ ϑΝΠϧʢ͔Կ͔ʣ΁ͷ ग़ྗ͸৭Μͳͱ͜ΖΛ ܦ༝ͯ͠Χʔωϧͷ γεςϜίʔϧΛ࣮ߦ͢Δ

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ग़ྗ͞Εͨ಺༰͸ ίʔϧ͞Εͨؔ਺Λ ͔͞ͷ΅ͬͯ஋Λฦ͢

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console.log(‘foo’) —— ೖྗͱೖྗΛड͚औΔڥք WebInspector ConsoleObserver LogManager messageWasAdded —— JSͱC++ͷڥք Interpreter#eval JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION JSFunction::Create consoleProtoFuncLog consoleLogWithLevel logWithLevel messageWithTypeAndLevel printConsoleMessageWithArguments WTFLogAlways vprintf_stderr_with_trailing_newline vprintf_stderr_common logToStderr fputs —— C++ͱCͷڥք? many C++ & C implementations —— CͱΧʔωϧͷڥք? Kernel system call

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Θ͔ͬͨ͜ͱ

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ϒϥ΢β͸ڊେͳ ϥϯλΠϜ+ίϯύΠϥ

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[native code] ා͘ͳ͍

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͓·͚ ʢ࣌ؒ͋ͬͨΒʣ

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WebKitͷ δϫδϫ͘Δͱ͜Ζ

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1. UIͷ෦෼͕es6Ͱ ॻ͔Ε͍ͯΔ

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= 1ͭͷϦϙδτϦʹ es6ࣗମͷ࣮૷ͱ es6ͷίʔυͱ es6ͷlintϑΝΠϧ͕͋Δ

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2. UIͷ෦෼ͷjsίʔυ͕ ͚ͬ͜͏console.assertΛ ࢖͍ͬͯΔ

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= ΫϥΠΞϯτͰى͖Δࣄ ͸৴༻Ͱ͖ͳ͍͠ ҉໧తͳܕม׵΋ා͍͠ = ͦ͏ͩconsoleʹ ศརͳؔ਺͋Δ͔Β ࢖ͬͪΌ͓͏ͥ

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3. rubyͱ͔pythonͷ εΫϦϓτ͕ͨ·ʹ͍Δ

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= ։ൃऀ͕༻ҙͨ͠ Ϗϧυ΍σόοά༻ͷ εΫϦϓτͳͲ = ͨͿΜ։ൃऀͷ޷ΈʹΑͬͯ rubyͱ͔pythonͰॻ͔Ε͍ͯΔ

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͓͠·͍