'Let’s Understand Chrome V8 — Chapter 16: What is Runtime? Why is it important?' cc: hackernoon qing_8391 javascript javascriptdevelopment
From the view of implementation: the builtins are implemented by Runtime, Torque , JavaScript, and ASM. Below is the official description of the V8:Platform-dependent assembly language: can be highly efficient, but need manual ports to all platforms and are difficult to maintain.
In this article, I will talk about the initialization and call of Runtime. By learning them, we will have a comprehensive understanding of the workflow of Runtime.Runtime is the foundation component of V8, which is initialized during the V8 startup and is managed by the ExternalReferenceTable which is a pointer array for holding external resources. The below Init is responsible for the initialization of ExternalReferenceTable.
In the above code, the 7th line is the initialization of the Runtime AddRuntimeFunctions where is below. Figure 1 is adding a Runtime function into the ExternalReferenceTable and gives you a chance to watch runtime_functions in the local variable window. kIntrinsicFunctions []={ //..................... { Runtime::kDebugPrint, Runtime::RUNTIME, "DebugPrint", ), 1, 1 }, //.....................1. class ExternalReferenceTable { 2. public: 3. static constexpr int kSpecialReferenceCount=1; 4. static constexpr int kExternalReferenceCount= 5. ExternalReference::kExternalReferenceCount; 6. static constexpr int kBuiltinsReferenceCount= 7. #define COUNT_C_BUILTIN +1 8. BUILTIN_LIST_C; 9. #undef COUNT_C_BUILTIN 10.
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