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diff --git a/js/src/jit/ICStubSpace.h b/js/src/jit/ICStubSpace.h
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+++ b/js/src/jit/ICStubSpace.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_ICStubSpace_h
+#define jit_ICStubSpace_h
+
+#include "ds/LifoAlloc.h"
+
+namespace js {
+namespace jit {
+
+// ICStubSpace is an abstraction for allocation policy and storage for CacheIR
+// stub data. There are two kinds of Baseline CacheIR stubs:
+//
+// (1) CacheIR stubs that can make non-tail calls that can GC. These are
+//     allocated in a LifoAlloc stored in JitScript.
+//     See JitScriptICStubSpace.
+//
+// (2) Other CacheIR stubs (aka optimized IC stubs). Allocated in a per-Zone
+//     LifoAlloc and purged when JIT-code is discarded.
+//     See OptimizedICStubSpace.
+class ICStubSpace {
+ protected:
+  LifoAlloc allocator_;
+
+  explicit ICStubSpace(size_t chunkSize) : allocator_(chunkSize) {}
+
+ public:
+  inline void* alloc(size_t size) { return allocator_.alloc(size); }
+
+  JS_DECLARE_NEW_METHODS(allocate, alloc, inline)
+
+  void freeAllAfterMinorGC(JS::Zone* zone);
+
+#ifdef DEBUG
+  bool isEmpty() const { return allocator_.isEmpty(); }
+#endif
+
+  size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
+    return allocator_.sizeOfExcludingThis(mallocSizeOf);
+  }
+};
+
+// Space for optimized stubs. Every JitZone has a single OptimizedICStubSpace.
+struct OptimizedICStubSpace : public ICStubSpace {
+  static const size_t STUB_DEFAULT_CHUNK_SIZE = 4096;
+
+ public:
+  OptimizedICStubSpace() : ICStubSpace(STUB_DEFAULT_CHUNK_SIZE) {}
+};
+
+// Space for Can-GC stubs. Every JitScript has a JitScriptICStubSpace.
+struct JitScriptICStubSpace : public ICStubSpace {
+  static const size_t STUB_DEFAULT_CHUNK_SIZE = 4096;
+
+ public:
+  JitScriptICStubSpace() : ICStubSpace(STUB_DEFAULT_CHUNK_SIZE) {}
+};
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_ICStubSpace_h */