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diff --git a/src/third_party/mozjs-60/extract/js/src/wasm/WasmCompile.h b/src/third_party/mozjs-60/extract/js/src/wasm/WasmCompile.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ *
+ * Copyright 2015 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_compile_h
+#define wasm_compile_h
+
+#include "wasm/WasmModule.h"
+
+namespace js {
+namespace wasm {
+
+// Describes the JS scripted caller of a request to compile a wasm module.
+
+struct ScriptedCaller
+{
+    UniqueChars filename;
+    unsigned line;
+    unsigned column;
+};
+
+struct ResponseURLs
+{
+    UniqueChars baseURL;
+    UniqueChars sourceMapURL;
+};
+
+// Describes all the parameters that control wasm compilation.
+
+struct CompileArgs : ShareableBase<CompileArgs>
+{
+    Assumptions assumptions;
+    ScriptedCaller scriptedCaller;
+    ResponseURLs responseURLs;
+    bool baselineEnabled;
+    bool debugEnabled;
+    bool ionEnabled;
+    bool sharedMemoryEnabled;
+    bool testTiering;
+
+    CompileArgs(Assumptions&& assumptions, ScriptedCaller&& scriptedCaller)
+      : assumptions(Move(assumptions)),
+        scriptedCaller(Move(scriptedCaller)),
+        baselineEnabled(false),
+        debugEnabled(false),
+        ionEnabled(false),
+        sharedMemoryEnabled(false),
+        testTiering(false)
+    {}
+
+    // If CompileArgs is constructed without arguments, initFromContext() must
+    // be called to complete initialization.
+    CompileArgs() = default;
+    bool initFromContext(JSContext* cx, ScriptedCaller&& scriptedCaller);
+};
+
+typedef RefPtr<CompileArgs> MutableCompileArgs;
+typedef RefPtr<const CompileArgs> SharedCompileArgs;
+
+// Return the estimated compiled (machine) code size for the given bytecode size
+// compiled at the given tier.
+
+double
+EstimateCompiledCodeSize(Tier tier, size_t bytecodeSize);
+
+// Compile the given WebAssembly bytecode with the given arguments into a
+// wasm::Module. On success, the Module is returned. On failure, the returned
+// SharedModule pointer is null and either:
+//  - *error points to a string description of the error
+//  - *error is null and the caller should report out-of-memory.
+
+SharedModule
+CompileBuffer(const CompileArgs& args, const ShareableBytes& bytecode, UniqueChars* error);
+
+// Attempt to compile the second tier of the given wasm::Module, returning whether
+// tier-2 compilation succeeded and Module::finishTier2 was called.
+
+bool
+CompileTier2(const CompileArgs& args, Module& module, Atomic<bool>* cancelled);
+
+// Compile the given WebAssembly module which has been broken into three
+// partitions:
+//  - envBytes contains a complete ModuleEnvironment that has already been
+//    copied in from the stream.
+//  - codeBytes is pre-sized to hold the complete code section when the stream
+//    completes.
+//  - The range [codeBytes.begin(), codeStreamEnd) contains the bytes currently
+//    read from the stream and codeStreamEnd will advance until either
+//    the stream is cancelled or codeStreamEnd == codeBytes.end().
+//  - tailBytesPtr is null until the module has finished streaming at which
+//    point tailBytesPtr will point to the complete tail bytes.
+// The ExclusiveWaitableData are notified when CompileStreaming() can make
+// progress (i.e., codeStreamEnd advances or tailBytes is set to non-null).
+// If cancelled is set to true, compilation aborts and returns null. After
+// cancellation is set, both ExclusiveWaitableData will be notified and so every
+// wait() loop must check cancelled.
+
+typedef ExclusiveWaitableData<const uint8_t*> ExclusiveStreamEnd;
+typedef ExclusiveWaitableData<const Bytes*> ExclusiveTailBytesPtr;
+
+SharedModule
+CompileStreaming(const CompileArgs& args,
+                 const Bytes& envBytes,
+                 const Bytes& codeBytes,
+                 const ExclusiveStreamEnd& codeStreamEnd,
+                 const ExclusiveTailBytesPtr& tailBytesPtr,
+                 const Atomic<bool>& cancelled,
+                 UniqueChars* error);
+
+}  // namespace wasm
+}  // namespace js
+
+#endif // namespace wasm_compile_h