'Let’s Understand Chrome V8 — Chapter 12: What is JSFunction? ' javascript nodejs
The data structure that saves bytecodes is SharedFunction, and the SharedFunction bound to the context is JSFunction. What is the difference? In my opinion, a SharedFunction is like a DLL, a common library that can be shared by multiple programs; and, a JSFunction is a specific executable program. In this paper, we’ll talk about the JSFunction’s code and the memory layout.1. class JSFunction : public JSObject { 2. public: 3. DECL_ACCESSORS 4. DECL_ACCESSORS 5.
1. Local UnboundScript::BindToCurrentContext { 2. auto function_info= 3. i::Handle::cast); 4. i::Isolate* isolate=function_info->GetIsolate; 5. i::Handle function= 6. isolate->factory->NewFunctionFromSharedFunctionInfo); 8. return ToApiHandle; 9. } 10. //................omit...................................... 11. Handle Factory::NewFunctionFromSharedFunctionInfo { 14. DCHECK_EQ); 15. Handle result= 16. NewFunction; 17. // Give compiler a chance to pre-initialize. 18.
Our test case is the bytecode array, so the return value of GetCode is kInterpreterEntryTrampoline. The role of GetCode is to return an entry method according to the type of SharedFunctionInfo, which is used to jump to the corresponding bytecode and execute it . The TORQUE_GENERATED_JSFUNCTION_FIELDS defines the offset of all members, and StartOffset is the base address. V8 reads and writes members by StartOffset+offset. Take set_code as an example to explain, the code is below.
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