v8
8.6.395 (node 15.0.1)
V8 is Google's open source JavaScript engine
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#include <v8.h>
Public Types | |
enum class | AllocationMode { kNormal , kReservation } |
Public Member Functions | |
virtual | ~Allocator ()=default |
virtual void * | Allocate (size_t length)=0 |
virtual void * | AllocateUninitialized (size_t length)=0 |
virtual void | Free (void *data, size_t length)=0 |
virtual void * | Reallocate (void *data, size_t old_length, size_t new_length) |
Static Public Member Functions | |
static Allocator * | NewDefaultAllocator () |
A thread-safe allocator that V8 uses to allocate |ArrayBuffer|'s memory. The allocator is a global V8 setting. It has to be set via Isolate::CreateParams.
Memory allocated through this allocator by V8 is accounted for as external memory by V8. Note that V8 keeps track of the memory for all internalized |ArrayBuffer|s. Responsibility for tracking external memory (using Isolate::AdjustAmountOfExternalAllocatedMemory) is handed over to the embedder upon externalization and taken over upon internalization (creating an internalized buffer from an existing buffer).
Note that it is unsafe to call back into V8 from any of the allocator functions.
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strong |
ArrayBuffer allocation mode. kNormal is a malloc/free style allocation, while kReservation is for larger allocations with the ability to set access permissions.
Enumerator | |
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kNormal | |
kReservation |
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virtualdefault |
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pure virtual |
Allocate |length| bytes. Return nullptr if allocation is not successful. Memory should be initialized to zeroes.
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pure virtual |
Allocate |length| bytes. Return nullptr if allocation is not successful. Memory does not have to be initialized.
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pure virtual |
Free the memory block of size |length|, pointed to by |data|. That memory is guaranteed to be previously allocated by |Allocate|.
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static |
malloc/free based convenience allocator.
Caller takes ownership, i.e. the returned object needs to be freed using |delete allocator| once it is no longer in use.
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virtual |
Reallocate the memory block of size |old_length| to a memory block of size |new_length| by expanding, contracting, or copying the existing memory block. If |new_length| > |old_length|, then the new part of the memory must be initialized to zeros. Return nullptr if reallocation is not successful.
The caller guarantees that the memory block was previously allocated using Allocate or AllocateUninitialized.
The default implementation allocates a new block and copies data.