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diff --git a/js/src/wasm/WasmTable.h b/js/src/wasm/WasmTable.h
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+++ b/js/src/wasm/WasmTable.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 2016 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_table_h
+#define wasm_table_h
+
+#include "gc/Policy.h"
+#include "wasm/WasmCode.h"
+
+namespace js {
+namespace wasm {
+
+// A Table is an indexable array of opaque values. Tables are first-class
+// stateful objects exposed to WebAssembly. asm.js also uses Tables to represent
+// its homogeneous function-pointer tables.
+//
+// A table of FuncRef holds FunctionTableElems, which are (code*,tls*) pairs,
+// where the tls must be traced.
+//
+// A table of AnyRef holds JSObject pointers, which must be traced.
+
+// TODO/AnyRef-boxing: With boxed immediates and strings, JSObject* is no longer
+// the most appropriate representation for Cell::anyref.
+STATIC_ASSERT_ANYREF_IS_JSOBJECT;
+
+typedef GCVector<HeapPtr<JSObject*>, 0, SystemAllocPolicy> TableAnyRefVector;
+
+class Table : public ShareableBase<Table> {
+  using InstanceSet =
+      JS::WeakCache<GCHashSet<WeakHeapPtrWasmInstanceObject,
+                              MovableCellHasher<WeakHeapPtrWasmInstanceObject>,
+                              SystemAllocPolicy>>;
+  using UniqueFuncRefArray = UniquePtr<FunctionTableElem[], JS::FreePolicy>;
+
+  WeakHeapPtrWasmTableObject maybeObject_;
+  InstanceSet observers_;
+  UniqueFuncRefArray functions_;  // either functions_ has data
+  TableAnyRefVector objects_;     //   or objects_, but not both
+  const RefType elemType_;
+  const bool isAsmJS_;
+  uint32_t length_;
+  const Maybe<uint32_t> maximum_;
+
+  template <class>
+  friend struct js::MallocProvider;
+  Table(JSContext* cx, const TableDesc& td, HandleWasmTableObject maybeObject,
+        UniqueFuncRefArray functions);
+  Table(JSContext* cx, const TableDesc& td, HandleWasmTableObject maybeObject,
+        TableAnyRefVector&& objects);
+
+  void tracePrivate(JSTracer* trc);
+  friend class js::WasmTableObject;
+
+ public:
+  static RefPtr<Table> create(JSContext* cx, const TableDesc& desc,
+                              HandleWasmTableObject maybeObject);
+  void trace(JSTracer* trc);
+
+  RefType elemType() const { return elemType_; }
+  TableRepr repr() const { return elemType_.tableRepr(); }
+
+  bool isAsmJS() const {
+    MOZ_ASSERT(elemType_.isFunc());
+    return isAsmJS_;
+  }
+  bool isFunction() const { return elemType().isFunc(); }
+  uint32_t length() const { return length_; }
+  Maybe<uint32_t> maximum() const { return maximum_; }
+
+  // Only for function values.  Raw pointer to the table.
+  uint8_t* functionBase() const;
+
+  // set/get/fillFuncRef is allowed only on table-of-funcref.
+  // get/fillAnyRef is allowed only on table-of-anyref.
+  // setNull is allowed on either.
+
+  const FunctionTableElem& getFuncRef(uint32_t index) const;
+  bool getFuncRef(JSContext* cx, uint32_t index,
+                  MutableHandleFunction fun) const;
+  void setFuncRef(uint32_t index, void* code, const Instance* instance);
+  void fillFuncRef(uint32_t index, uint32_t fillCount, FuncRef ref,
+                   JSContext* cx);
+
+  AnyRef getAnyRef(uint32_t index) const;
+  void fillAnyRef(uint32_t index, uint32_t fillCount, AnyRef ref);
+
+  void setNull(uint32_t index);
+
+  // Copy entry from |srcTable| at |srcIndex| to this table at |dstIndex|.  Used
+  // by table.copy.  May OOM if it needs to box up a function during an upcast.
+  bool copy(const Table& srcTable, uint32_t dstIndex, uint32_t srcIndex);
+
+  // grow() returns (uint32_t)-1 if it could not grow.
+  uint32_t grow(uint32_t delta);
+  bool movingGrowable() const;
+  bool addMovingGrowObserver(JSContext* cx, WasmInstanceObject* instance);
+
+  // about:memory reporting:
+
+  size_t sizeOfExcludingThis(MallocSizeOf mallocSizeOf) const;
+
+  size_t gcMallocBytes() const;
+};
+
+using SharedTable = RefPtr<Table>;
+typedef Vector<SharedTable, 0, SystemAllocPolicy> SharedTableVector;
+
+}  // namespace wasm
+}  // namespace js
+
+#endif  // wasm_table_h