V8のコードベース

V8のC++コードベースについてなど

Transcript

1. V8 Codebase
   

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2. 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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3. Basic C++ code
   倜׋ז؝٦سכC++14ד鷄⸇ׁ׸גְ׷կ
   〢ְ؝٦سחC++03ךせ婍כ֮׷׮ךךlambdaהַכ穠圓⢪׻׸ג
   ְ׷կ
   遤侧כ882,616遤֮׷
   

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4. Build tools
   GNהְֲًةؽٕسخ٦ٕ׾ⵃ欽׃גְ׷կ
   㹋ꥷךؽٕسכninja
   ؝ٝػ؎ٓכخ٦ٕثؑ٦ٝ׾تؐٝٗ٦سׅ׷״ֲחז׏גְג
   clang7.0.0׾تؐٝٗ٦س׃גⵃ欽ׅ׷״ֲחז׏גְ׷
   

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5. Lint
   ؝ىحز⵸חcpplintָ饥׏גծؿؓ٦وحز麩⿾ך؝٦سכ؝ىح
   زדֹזְ
   

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6. Format
   clang-formatד✲⵸חؿؓ٦وحز׃זְה؝ىحزדֹזְ
   

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7. Problems
   -  وָؙٗ㢳ְ٥זַזַ搀蘠
   -  ؝٦سك٦أָ㣐ְֹךדIDE禸כ㔿ת׷✲ָ㢳ְ
   -  ؝٦سك٦أָ㣐ְֹךדؽٕسָ鹼ְ
   

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8. Complicated Macros
   وָؙٗ醱꧟
   وؙٗדؙٓأ׾㹀纏׃׋׶…
   Problems
   

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9. #define IGNITION_HANDLER(Name, BaseAssembler) \!
   class Name##Assembler : public BaseAssembler { \!
   public: \!
   explicit Name##Assembler(compiler::CodeAssemblerState* state, \!
   Bytecode bytecode, OperandScale scale) \!
   : BaseAssembler(state, bytecode, scale) {} \!
   static void Generate(compiler::CodeAssemblerState* state, \!
   OperandScale scale); \!
   \!
   private: \!
   void GenerateImpl(); \!
   DISALLOW_COPY_AND_ASSIGN(Name##Assembler); \!
   }; \!
   void Name##Assembler::Generate(compiler::CodeAssemblerState* state, \!
   OperandScale scale) { \!
   Name##Assembler assembler(state, Bytecode::k##Name, scale); \!
   state->SetInitialDebugInformation(#Name, __FILE__, __LINE__); \!
   assembler.GenerateImpl(); \!
   } \!
   void Name##Assembler::GenerateImpl()!
   

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10. IGNITION_HANDLER(LdaZero, InterpreterAssembler) {!
    Node* zero_value = NumberConstant(0.0);!
    SetAccumulator(zero_value);!
    Dispatch();!
    }!
    

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11. Reusable Enum member
    وؙٗדenumךًٝغ׾ⱄⵃ欽ׅ׷؛٦أָ㢳ְ
    Problems
    

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12. #define BYTECODE_LIST(V) \!
    /* Extended width operands */ \!
    V(Wide, AccumulatorUse::kNone) \!
    V(ExtraWide, AccumulatorUse::kNone) \!
    \!
    /* Loading the accumulator */ \!
    V(LdaZero, AccumulatorUse::kWrite) \!
    V(LdaSmi, AccumulatorUse::kWrite, OperandType::kImm) \!
    V(LdaUndefined, AccumulatorUse::kWrite) \!
    V(LdaNull, AccumulatorUse::kWrite) \!
    V(LdaTheHole, AccumulatorUse::kWrite) \!
    V(LdaTrue, AccumulatorUse::kWrite) \!
    .!
    .!
    .!
    

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13. const OperandTypeInfo*!
    const Bytecodes::kOperandTypeInfos[] = {!
    #define ENTRY(Name, ...)
    BytecodeTraits::kOperandTypeInfos,!
    BYTECODE_LIST(ENTRY)!
    #undef ENTRY!
    };!
    

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14. switch (bytecode) {!
    #define CASE(Name, ...) \!
    case Bytecode::k##Name: \!
    return #Name;!
    BYTECODE_LIST(CASE)!
    #undef CASE!
    }!
    

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15. IDE Frozen
    ⬁כEmacsזךדRtagsדְַֽאדׅ(^^)
    Problems
    

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16. Slow Build
    EC2׾㤍秈׃גrsyncד؝٦س㢌刿ָ֮׷׋ןח鷏⥋ׅ׷״ֲח
    ׃׋
    ؽٕسכEC2ךUbuntuדװ׷
    Problems
    

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17. Watch
    overlookהְֲ،فٔ׾⢪ֲה؝٦س㢌刿׾嗚濼׃גءٕؑ٥؝
    وٝس׾㹋遤דֹ׷
    v8/src׾湊鋔׃גrsyncׅ׷
    Problems
    

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