node/src/allocated_buffer.h at master · dev-script/node · GitHub

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#ifndef SRC_ALLOCATED_BUFFER_H_

#define SRC_ALLOCATED_BUFFER_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "base_object.h"

#include "uv.h"

#include "v8.h"

#include "env.h"

namespace node {

class Environment;

// Disables zero-filling for ArrayBuffer allocations in this scope. This is

// similar to how we implement Buffer.allocUnsafe() in JS land.

class NoArrayBufferZeroFillScope{

public:

inline explicit NoArrayBufferZeroFillScope(IsolateData* isolate_data);

inline ~NoArrayBufferZeroFillScope();

private:

NodeArrayBufferAllocator* node_allocator_;

friend class Environment;

};

// A unique-pointer-ish object that is compatible with the JS engine's

// ArrayBuffer::Allocator.

// TODO(addaleax): We may want to start phasing this out as it's only a

// thin wrapper around v8::BackingStore at this point

struct AllocatedBuffer {

public:

// Utilities that allocate memory using the Isolate's ArrayBuffer::Allocator.

// In particular, using AllocateManaged() will provide a RAII-style object

// with easy conversion to `Buffer` and `ArrayBuffer` objects.

inline static AllocatedBuffer AllocateManaged(Environment* env, size_t size);

AllocatedBuffer() = default;

inline AllocatedBuffer(

Environment* env, std::unique_ptr<v8::BackingStore> bs);

// For this constructor variant, `buffer` *must* come from an earlier call

// to .release

inline AllocatedBuffer(Environment* env, uv_buf_t buffer);

inline void Resize(size_t len);

inline uv_buf_t release();

inline char* data();

inline const char* data() const;

inline size_t size() const;

inline void clear();

inline v8::MaybeLocal<v8::Object> ToBuffer();

inline v8::Local<v8::ArrayBuffer> ToArrayBuffer();

AllocatedBuffer(AllocatedBuffer&& other) = default;

AllocatedBuffer& operator=(AllocatedBuffer&& other) = default;

AllocatedBuffer(const AllocatedBuffer& other) = delete;

AllocatedBuffer& operator=(const AllocatedBuffer& other) = delete;

private:

Environment* env_ = nullptr;

std::unique_ptr<v8::BackingStore> backing_store_;

friend class Environment;

};

} // namespace node

#endif // NODE_WANT_INTERNALS

#endif // SRC_ALLOCATED_BUFFER_H_

node/src/allocated_buffer.h at master · dev-script/node · GitHub

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