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allocated_buffer.h
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73 lines (55 loc) · 2.15 KB
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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_