1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 * vim: set ts=8 sts=2 et sw=2 tw=80:
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 #ifndef js_WasmModule_h
8 #define js_WasmModule_h
10 #include "mozilla/RefPtr.h" // RefPtr
12 #include "jstypes.h" // JS_PUBLIC_API
14 #include "js/RefCounted.h" // AtomicRefCounted
15 #include "js/TypeDecls.h" // HandleObject
20 * The WasmModule interface allows the embedding to hold a reference to the
21 * underying C++ implementation of a JS WebAssembly.Module object for purposes
22 * of efficient postMessage() and (de)serialization from a random thread.
24 * In particular, this allows postMessage() of a WebAssembly.Module:
25 * GetWasmModule() is called when making a structured clone of a payload
26 * containing a WebAssembly.Module object. The structured clone buffer holds a
27 * refcount of the JS::WasmModule until createObject() is called in the target
28 * agent's JSContext. The new WebAssembly.Module object continues to hold the
29 * JS::WasmModule and thus the final reference of a JS::WasmModule may be
30 * dropped from any thread and so the virtual destructor (and all internal
31 * methods of the C++ module) must be thread-safe.
34 struct WasmModule
: js::AtomicRefCounted
<WasmModule
> {
35 virtual ~WasmModule() = default;
36 virtual JSObject
* createObject(JSContext
* cx
) const = 0;
37 virtual JSObject
* createObjectForAsmJS(JSContext
* cx
) const = 0;
40 extern JS_PUBLIC_API
bool IsWasmModuleObject(HandleObject obj
);
42 extern JS_PUBLIC_API RefPtr
<WasmModule
> GetWasmModule(HandleObject obj
);
46 #endif /* js_WasmModule_h */