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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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 */
#ifndef js_experimental_CTypes_h
#define js_experimental_CTypes_h
#include "mozilla/Attributes.h" // MOZ_RAII
#include <stddef.h> // size_t
#include "jstypes.h" // JS_PUBLIC_API
#include "js/TypeDecls.h"
namespace JS {
* Initialize the 'ctypes' object on a global variable 'obj'. The 'ctypes'
* object will be sealed.
extern JS_PUBLIC_API bool InitCTypesClass(JSContext* cx,
Handle<JSObject*> global);
#endif // JS_HAS_CTYPES
* The type of ctypes activity that is occurring.
enum class CTypesActivityType {
* The signature of a function invoked at the leading or trailing edge of ctypes
* activity.
using CTypesActivityCallback = void (*)(JSContext*, CTypesActivityType);
* Sets a callback that is run whenever js-ctypes is about to be used when
* calling into C.
extern JS_PUBLIC_API void SetCTypesActivityCallback(JSContext* cx,
CTypesActivityCallback cb);
class MOZ_RAII JS_PUBLIC_API AutoCTypesActivityCallback {
JSContext* cx;
CTypesActivityCallback callback;
CTypesActivityType endType;
AutoCTypesActivityCallback(JSContext* cx, CTypesActivityType beginType,
CTypesActivityType endType);
~AutoCTypesActivityCallback() { DoEndCallback(); }
void DoEndCallback() {
if (callback) {
callback(cx, endType);
callback = nullptr;
* Convert a unicode string 'source' of length 'slen' to the platform native
* charset, returning a null-terminated string allocated with JS_malloc. On
* failure, this function should report an error.
using CTypesUnicodeToNativeFun = char* (*)(JSContext*, const char16_t*, size_t);
* Set of function pointers that ctypes can use for various internal functions.
* See JS::SetCTypesCallbacks below. Providing nullptr for a function is safe
* and will result in the applicable ctypes functionality not being available.
struct CTypesCallbacks {
CTypesUnicodeToNativeFun unicodeToNative;
* Set the callbacks on the provided 'ctypesObj' object. 'callbacks' should be a
* pointer to static data that exists for the lifetime of 'ctypesObj', but it
* may safely be altered after calling this function and without having
* to call this function again.
extern JS_PUBLIC_API void SetCTypesCallbacks(JSObject* ctypesObj,
const CTypesCallbacks* callbacks);
#endif // JS_HAS_CTYPES
} // namespace JS
#endif // js_experimental_CTypes_h