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diff --git a/js/src/jit/CompileWrappers.h b/js/src/jit/CompileWrappers.h
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+++ b/js/src/jit/CompileWrappers.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:
+ * 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 <stdint.h>
+
+#include "gc/Pretenuring.h"
+#include "js/TypeDecls.h"
+
+struct JSAtomState;
+
+namespace mozilla::non_crypto {
+class XorShift128PlusRNG;
+}
+
+namespace JS {
+enum class TraceKind;
+}
+
+namespace js {
+
+class GeckoProfilerRuntime;
+class GlobalObject;
+struct JSDOMCallbacks;
+class PropertyName;
+class StaticStrings;
+struct WellKnownSymbols;
+
+using DOMCallbacks = struct JSDOMCallbacks;
+
+namespace gc {
+
+enum class AllocKind : uint8_t;
+
+class FreeSpan;
+
+}  // namespace gc
+
+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 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);
+
+#ifdef JS_GC_ZEAL
+  const uint32_t* addressOfGCZealModeBits();
+#endif
+
+  const JitRuntime* jitRuntime();
+
+  // Compilation does not occur off thread when the Gecko Profiler is enabled.
+  GeckoProfilerRuntime& geckoProfiler();
+
+  bool hadOutOfMemory();
+  bool profilingScripts();
+
+  const JSAtomState& names();
+  const PropertyName* emptyString();
+  const StaticStrings& staticStrings();
+  const WellKnownSymbols& wellKnownSymbols();
+  const JSClass* maybeWindowProxyClass();
+
+  const void* mainContextPtr();
+  const void* addressOfJitStackLimit();
+  const void* addressOfInterruptBits();
+  const void* addressOfZone();
+  const void* addressOfMegamorphicCache();
+  const void* addressOfStringToAtomCache();
+
+#ifdef DEBUG
+  const void* addressOfIonBailAfterCounter();
+#endif
+
+  // DOM callbacks must be threadsafe (and will hopefully be removed soon).
+  const DOMCallbacks* DOMcallbacks();
+
+  bool runtimeMatches(JSRuntime* rt);
+};
+
+class CompileZone {
+  friend class MacroAssembler;
+  JS::Zone* zone();
+
+ public:
+  static CompileZone* get(JS::Zone* zone);
+
+  CompileRuntime* runtime();
+  bool isAtomsZone();
+
+  const uint32_t* addressOfNeedsIncrementalBarrier();
+  uint32_t* addressOfTenuredAllocCount();
+  gc::FreeSpan** addressOfFreeList(gc::AllocKind allocKind);
+  void* addressOfNurseryPosition();
+  void* addressOfStringNurseryPosition();
+  void* addressOfBigIntNurseryPosition();
+  const void* addressOfNurseryCurrentEnd();
+  const void* addressOfStringNurseryCurrentEnd();
+  const void* addressOfBigIntNurseryCurrentEnd();
+
+  uint32_t* addressOfNurseryAllocCount();
+
+  void* addressOfNurseryAllocatedSites();
+
+  bool canNurseryAllocateStrings();
+  bool canNurseryAllocateBigInts();
+
+  uintptr_t nurseryCellHeader(JS::TraceKind traceKind,
+                              gc::CatchAllAllocSite siteKind);
+};
+
+class JitRealm;
+
+class CompileRealm {
+  JS::Realm* realm();
+
+ public:
+  static CompileRealm* get(JS::Realm* realm);
+
+  CompileZone* zone();
+  CompileRuntime* runtime();
+
+  const void* realmPtr() { return realm(); }
+
+  const mozilla::non_crypto::XorShift128PlusRNG*
+  addressOfRandomNumberGenerator();
+
+  const JitRealm* jitRealm();
+
+  const GlobalObject* maybeGlobal();
+  const uint32_t* addressOfGlobalWriteBarriered();
+
+  bool hasAllocationMetadataBuilder();
+};
+
+class JitCompileOptions {
+ public:
+  JitCompileOptions();
+  explicit JitCompileOptions(JSContext* cx);
+
+  bool profilerSlowAssertionsEnabled() const {
+    return profilerSlowAssertionsEnabled_;
+  }
+
+  bool offThreadCompilationAvailable() const {
+    return offThreadCompilationAvailable_;
+  }
+
+#ifdef DEBUG
+  bool ionBailAfterEnabled() const { return ionBailAfterEnabled_; }
+#endif
+
+ private:
+  bool profilerSlowAssertionsEnabled_;
+  bool offThreadCompilationAvailable_;
+#ifdef DEBUG
+  bool ionBailAfterEnabled_ = false;
+#endif
+};
+
+}  // namespace jit
+}  // namespace js
+
+#endif  // jit_CompileWrappers_h