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diff --git a/js/src/jit/CompileWrappers.h b/js/src/jit/CompileWrappers.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:
+ * 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 http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_CompileWrappers_h
+#define jit_CompileWrappers_h
+
+#include "jscntxt.h"
+
+namespace js {
+namespace jit {
+
+class JitRuntime;
+
+// During Ion compilation we need access to various bits of the current
+// compartment, runtime and so forth. However, since compilation can run off
+// thread while the main thread is actively mutating the VM, this access needs
+// to be restricted. The classes below give the compiler an interface to access
+// all necessary information in a threadsafe fashion.
+
+class CompileRuntime
+{
+    JSRuntime* runtime();
+
+  public:
+    static CompileRuntime* get(JSRuntime* rt);
+
+    bool onMainThread();
+
+    js::PerThreadData* mainThread();
+
+    // &runtime()->jitTop
+    const void* addressOfJitTop();
+
+    // &runtime()->jitActivation
+    const void* addressOfJitActivation();
+
+    // &runtime()->profilingActivation
+    const void* addressOfProfilingActivation();
+
+    // rt->runtime()->jitStackLimit;
+    const void* addressOfJitStackLimit();
+
+#ifdef DEBUG
+    // rt->runtime()->addressOfIonBailAfter;
+    const void* addressOfIonBailAfter();
+#endif
+
+    // &runtime()->activation_
+    const void* addressOfActivation();
+
+#ifdef JS_GC_ZEAL
+    const void* addressOfGCZealModeBits();
+#endif
+
+    const void* addressOfInterruptUint32();
+
+    // We have to bake JSContext* into JIT code, but this pointer shouldn't be
+    // used/dereferenced on the background thread so we return it as void*.
+    const void* getJSContext();
+
+    const JitRuntime* jitRuntime();
+
+    // Compilation does not occur off thread when the SPS profiler is enabled.
+    SPSProfiler& spsProfiler();
+
+    bool jitSupportsFloatingPoint();
+    bool hadOutOfMemory();
+    bool profilingScripts();
+
+    const JSAtomState& names();
+    const PropertyName* emptyString();
+    const StaticStrings& staticStrings();
+    const Value& NaNValue();
+    const Value& positiveInfinityValue();
+    const WellKnownSymbols& wellKnownSymbols();
+
+#ifdef DEBUG
+    bool isInsideNursery(gc::Cell* cell);
+#endif
+
+    // DOM callbacks must be threadsafe (and will hopefully be removed soon).
+    const DOMCallbacks* DOMcallbacks();
+
+    const Nursery& gcNursery();
+    void setMinorGCShouldCancelIonCompilations();
+
+    bool runtimeMatches(JSRuntime* rt);
+};
+
+class CompileZone
+{
+    Zone* zone();
+
+  public:
+    static CompileZone* get(Zone* zone);
+
+    const void* addressOfNeedsIncrementalBarrier();
+
+    const void* addressOfFreeList(gc::AllocKind allocKind);
+};
+
+class JitCompartment;
+
+class CompileCompartment
+{
+    JSCompartment* compartment();
+
+  public:
+    static CompileCompartment* get(JSCompartment* comp);
+
+    CompileZone* zone();
+    CompileRuntime* runtime();
+
+    const void* addressOfEnumerators();
+    const void* addressOfRandomNumberGenerator();
+    const void* addressOfLastCachedNativeIterator();
+
+    const JitCompartment* jitCompartment();
+
+    const GlobalObject* maybeGlobal();
+
+    bool hasAllocationMetadataBuilder();
+
+    // Mirror CompartmentOptions.
+    void setSingletonsAsValues();
+};
+
+class JitCompileOptions
+{
+  public:
+    JitCompileOptions();
+    explicit JitCompileOptions(JSContext* cx);
+
+    bool cloneSingletons() const {
+        return cloneSingletons_;
+    }
+
+    bool spsSlowAssertionsEnabled() const {
+        return spsSlowAssertionsEnabled_;
+    }
+
+    bool offThreadCompilationAvailable() const {
+        return offThreadCompilationAvailable_;
+    }
+
+  private:
+    bool cloneSingletons_;
+    bool spsSlowAssertionsEnabled_;
+    bool offThreadCompilationAvailable_;
+};
+
+} // namespace jit
+} // namespace js
+
+#endif // jit_CompileWrappers_h