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diff --git a/js/src/wasm/AsmJS.h b/js/src/wasm/AsmJS.h
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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:
+ *
+ * Copyright 2014 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef wasm_AsmJS_h
+#define wasm_AsmJS_h
+
+#include "mozilla/Utf8.h"  // mozilla::Utf8Unit
+
+#include <stdint.h>  // uint32_t
+
+#include "jstypes.h"      // JS_PUBLIC_API
+#include "js/CallArgs.h"  // JSNative
+
+struct JS_PUBLIC_API JSContext;
+class JS_PUBLIC_API JSFunction;
+
+namespace JS {
+
+class JS_PUBLIC_API Value;
+
+template <typename T>
+class Handle;
+
+}  // namespace JS
+
+namespace js {
+
+class FrontendContext;
+
+namespace frontend {
+
+class ParserAtomsTable;
+class ParseContext;
+class ParseNode;
+
+template <class ParseHandler, typename CharT>
+class Parser;
+class FullParseHandler;
+
+}  // namespace frontend
+
+template <typename Unit>
+using AsmJSParser = frontend::Parser<frontend::FullParseHandler, Unit>;
+
+// This function takes over parsing of a function starting with "use asm". The
+// return value indicates whether an error was reported which the caller should
+// propagate. If no error was reported, the function may still fail to validate
+// as asm.js. In this case, the parser.tokenStream has been advanced an
+// indeterminate amount and the entire function should be reparsed from the
+// beginning.
+
+[[nodiscard]] extern bool CompileAsmJS(FrontendContext* fc,
+                                       frontend::ParserAtomsTable& parserAtoms,
+                                       AsmJSParser<mozilla::Utf8Unit>& parser,
+                                       frontend::ParseNode* stmtList,
+                                       bool* validated);
+
+[[nodiscard]] extern bool CompileAsmJS(FrontendContext* fc,
+                                       frontend::ParserAtomsTable& parserAtoms,
+                                       AsmJSParser<char16_t>& parser,
+                                       frontend::ParseNode* stmtList,
+                                       bool* validated);
+
+// asm.js module/export queries:
+
+extern bool IsAsmJSModuleNative(JSNative native);
+
+extern bool IsAsmJSModule(JSFunction* fun);
+
+extern bool IsAsmJSFunction(JSFunction* fun);
+
+extern bool IsAsmJSStrictModeModuleOrFunction(JSFunction* fun);
+
+extern bool InstantiateAsmJS(JSContext* cx, unsigned argc, JS::Value* vp);
+
+// asm.js testing natives:
+
+extern bool IsAsmJSCompilationAvailable(JSContext* cx, unsigned argc,
+                                        JS::Value* vp);
+
+extern bool IsAsmJSCompilationAvailable(JSContext* cx);
+
+extern bool IsAsmJSModule(JSContext* cx, unsigned argc, JS::Value* vp);
+
+extern bool IsAsmJSFunction(JSContext* cx, unsigned argc, JS::Value* vp);
+
+// asm.js toString/toSource support:
+
+extern JSString* AsmJSFunctionToString(JSContext* cx,
+                                       JS::Handle<JSFunction*> fun);
+
+extern JSString* AsmJSModuleToString(JSContext* cx, JS::Handle<JSFunction*> fun,
+                                     bool isToSource);
+
+// asm.js heap:
+
+extern bool IsValidAsmJSHeapLength(size_t length);
+
+}  // namespace js
+
+#endif  // wasm_AsmJS_h