WasmModule.h (1786B)
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/. */ 6 7 #ifndef js_WasmModule_h 8 #define js_WasmModule_h 9 10 #include "mozilla/RefPtr.h" // RefPtr 11 12 #include "jstypes.h" // JS_PUBLIC_API 13 14 #include "js/RefCounted.h" // AtomicRefCounted 15 #include "js/TypeDecls.h" // HandleObject 16 17 namespace JS { 18 19 /** 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. 23 * 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. 32 */ 33 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; 38 }; 39 40 extern JS_PUBLIC_API bool IsWasmModuleObject(HandleObject obj); 41 42 extern JS_PUBLIC_API RefPtr<WasmModule> GetWasmModule(HandleObject obj); 43 44 } // namespace JS 45 46 #endif /* js_WasmModule_h */