v8對象機制

1.概述

???????? v8中每一個API對象都對應一個內部實現對象(堆對象)

2.對象創建過程

???????? (1)v8::internal::Factory類:創建各種內部對象(v8::internal::)

???????? (2)創建內部對象的內部Handle(v8::internal::Handle<T>),調用

?????????????????? i::Handle<T>::Handle(T* obj)->HandleScope::CreateHandle(obj);

?????????????????? 把(T*內部對象指針)放入static HandleScopeData;

???????? (3)把內部句柄轉化為API Handle(v8::internal::T**->v8::T*)，返回API Handle

??????????????????????????????????????????????

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V8內部類繼承層次

???? Object

???? |??? Smi????????? (immediate small integer)

???? |??? Failure????? (immediate for marking failed operation)

???? |??? HeapObject?? (superclass for everything allocated in the heap)

???? |??? |??? JSObject

???? |??? |??? |??? JSArray

???? |??? |??? |??? JSRegExp

???? |??? |??? |??? JSFunction

???? |??? |??? |??? GlobalObject

???? |??? |??? |??? |??? JSGlobalObject

???? |??? |??? |??? |??? JSBuiltinsObject

???? |??? |??? |??? JSGlobalProxy

???? |??? |??? |??? JSValue

???? |??? |??? ByteArray

???? |??? |??? PixelArray

???? |??? |??? ExternalArray

???? |??? |??? |??? ExternalByteArray

???? |??? |??? |??? ExternalUnsignedByteArray

???? |??? |??? |??? ExternalShortArray

???? |??? |??? |??? ExternalUnsignedShortArray

???? |??? |??? |??? ExternalIntArray

???? |??? |??? |??? ExternalUnsignedIntArray

???? |??? |??? |??? ExternalFloatArray

???? |??? |??? FixedArray

???? |??? |??? |??? DescriptorArray

???? |??? |??? |??? HashTable

???? |??? |??? |??? |??? Dictionary

???? |??? |??? |??? |??? |??? StringDictionary

???? |??? |??? |??? |??? |??? NumberDictionary

???? |??? |??? |??? |??? SymbolTable

???? |??? |??? |??? |??? CompilationCacheTable

???? |??? |??? |??? |??? CodeCacheHashTable

???? |??? |??? |??? |??? MapCache

???? |??? |??? |??? Context

???? |??? |??? |??? JSFunctionResultCache

???? |??? |??? |??? SerializedScopeInfo

???? |??? |??? String

???? |??? |??? |??? SeqString

???? |??? |??? |??? |??? SeqAsciiString

???? |??? |??? |??? |??? SeqTwoByteString

???? |??? |??? |??? ConsString

???? |??? |??? |??? ExternalString

???? |??? |??? |??? |??? ExternalAsciiString

???? |??? |??? |??? |??? ExternalTwoByteString

???? |??? |??? HeapNumber

???? |??? |??? Code

???? |??? |??? Map

???? |??? |??? Oddball

???? |??? |??? Proxy

???? |??? |??? SharedFunctionInfo

???? |??? |??? Struct

???? |??? |??? |??? AccessorInfo

???? |??? |??? |??? AccessCheckInfo

???? |??? |??? |??? InterceptorInfo

???? |??? |??? |??? CallHandlerInfo

???? |??? |??? |??? TemplateInfo

???? |??? |??? |??? |??? FunctionTemplateInfo

???? |??? |??? |??? |??? ObjectTemplateInfo

???? |??? |??? |??? Script

???? |??? |??? |??? SignatureInfo

???? |??? |??? |??? TypeSwitchInfo

???? |??? |??? |??? DebugInfo

???? |??? |??? |??? BreakPointInfo

???? |??? |??? |??? CodeCache

總結

以上是生活随笔為你收集整理的v8学习笔记(四) 对象机制的全部內容，希望文章能夠幫你解決所遇到的問題。

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