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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* ArrayBuffer functionality. */
#ifndef js_SharedArrayBuffer_h
#define js_SharedArrayBuffer_h
#include <stddef.h> // size_t
#include <stdint.h> // uint8_t
#include "jstypes.h" // JS_PUBLIC_API
struct JS_PUBLIC_API JSContext;
class JS_PUBLIC_API JSObject;
namespace JS {
class JS_PUBLIC_API AutoRequireNoGC;
// CREATION
/**
* Create a new SharedArrayBuffer with the given byte length. This
* may only be called if
* JS::RealmCreationOptionsRef(cx).getSharedMemoryAndAtomicsEnabled() is
* true.
*/
extern JS_PUBLIC_API JSObject* NewSharedArrayBuffer(JSContext* cx,
size_t nbytes);
// TYPE TESTING
/**
* Check whether obj supports the JS::GetSharedArrayBuffer* APIs. Note that
* this may return false if a security wrapper is encountered that denies the
* unwrapping. If this test succeeds, then it is safe to call the various
* accessor JSAPI calls defined below.
*/
extern JS_PUBLIC_API bool IsSharedArrayBufferObject(JSObject* obj);
// ACCESSORS
extern JS_PUBLIC_API JSObject* UnwrapSharedArrayBuffer(JSObject* obj);
extern JS_PUBLIC_API size_t GetSharedArrayBufferByteLength(JSObject* obj);
extern JS_PUBLIC_API uint8_t* GetSharedArrayBufferData(JSObject* obj,
bool* isSharedMemory,
const AutoRequireNoGC&);
// Ditto for SharedArrayBuffer.
//
// There is an isShared out argument for API consistency (eases use from DOM).
// It will always be set to true.
extern JS_PUBLIC_API void GetSharedArrayBufferLengthAndData(
JSObject* obj, size_t* length, bool* isSharedMemory, uint8_t** data);
/**
* Returns true if there are any live SharedArrayBuffer objects, including those
* for wasm memories, associated with the context. This is conservative,
* because it does not run GC. Some dead objects may not have been collected
* yet and thus will be thought live.
*/
extern JS_PUBLIC_API bool ContainsSharedArrayBuffer(JSContext* cx);
/**
* Return the isShared flag of a ArrayBufferView subtypes, which denotes whether
* the underlying buffer is a SharedArrayBuffer.
*
* |obj| must have passed a JS_IsArrayBufferViewObject test, or somehow
* be known that it would pass such a test: it is a ArrayBufferView subtypes or
* a wrapper of a ArrayBufferView subtypes, and the unwrapping will succeed.
*/
extern JS_PUBLIC_API bool IsArrayBufferViewShared(JSObject* obj);
} // namespace JS
#endif /* js_SharedArrayBuffer_h */
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