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diff --git a/js/src/jit/arm64/Lowering-arm64.h b/js/src/jit/arm64/Lowering-arm64.h
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+++ b/js/src/jit/arm64/Lowering-arm64.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_arm64_Lowering_arm64_h
+#define jit_arm64_Lowering_arm64_h
+
+#include "jit/shared/Lowering-shared.h"
+
+namespace js {
+namespace jit {
+
+class LIRGeneratorARM64 : public LIRGeneratorShared
+{
+  public:
+    LIRGeneratorARM64(MIRGenerator* gen, MIRGraph& graph, LIRGraph& lirGraph)
+      : LIRGeneratorShared(gen, graph, lirGraph)
+    { }
+
+  protected:
+    // Returns a box allocation. reg2 is ignored on 64-bit platforms.
+    LBoxAllocation useBoxFixed(MDefinition* mir, Register reg1, Register reg2,
+                               bool useAtStart = false);
+
+    LAllocation useByteOpRegister(MDefinition* mir);
+    LAllocation useByteOpRegisterAtStart(MDefinition* mir);
+    LAllocation useByteOpRegisterOrNonDoubleConstant(MDefinition* mir);
+
+    inline LDefinition tempToUnbox() {
+        return temp();
+    }
+
+    bool needTempForPostBarrier() { return true; }
+
+    // ARM64 has a scratch register, so no need for another temp for dispatch ICs.
+    LDefinition tempForDispatchCache(MIRType outputType = MIRType::None) {
+        return LDefinition::BogusTemp();
+    }
+
+    void lowerUntypedPhiInput(MPhi* phi, uint32_t inputPosition, LBlock* block, size_t lirIndex);
+    void defineUntypedPhi(MPhi* phi, size_t lirIndex);
+    void lowerInt64PhiInput(MPhi*, uint32_t, LBlock*, size_t) { MOZ_CRASH("NYI"); }
+    void defineInt64Phi(MPhi*, size_t) { MOZ_CRASH("NYI"); }
+    void lowerForShift(LInstructionHelper<1, 2, 0>* ins, MDefinition* mir, MDefinition* lhs,
+                       MDefinition* rhs);
+    void lowerUrshD(MUrsh* mir);
+
+    void lowerForALU(LInstructionHelper<1, 1, 0>* ins, MDefinition* mir, MDefinition* input);
+    void lowerForALU(LInstructionHelper<1, 2, 0>* ins, MDefinition* mir,
+                     MDefinition* lhs, MDefinition* rhs);
+
+    void lowerForALUInt64(LInstructionHelper<INT64_PIECES, 2 * INT64_PIECES, 0>* ins,
+                          MDefinition* mir, MDefinition* lhs, MDefinition* rhs);
+    void lowerForMulInt64(LMulI64* ins, MMul* mir, MDefinition* lhs, MDefinition* rhs);
+    template<size_t Temps>
+    void lowerForShiftInt64(LInstructionHelper<INT64_PIECES, INT64_PIECES + 1, Temps>* ins,
+                            MDefinition* mir, MDefinition* lhs, MDefinition* rhs);
+
+    void lowerForFPU(LInstructionHelper<1, 1, 0>* ins, MDefinition* mir, MDefinition* input);
+
+    template <size_t Temps>
+    void lowerForFPU(LInstructionHelper<1, 2, Temps>* ins, MDefinition* mir,
+                     MDefinition* lhs, MDefinition* rhs);
+
+    void lowerForCompIx4(LSimdBinaryCompIx4* ins, MSimdBinaryComp* mir,
+                         MDefinition* lhs, MDefinition* rhs)
+    {
+        return lowerForFPU(ins, mir, lhs, rhs);
+    }
+
+    void lowerForCompFx4(LSimdBinaryCompFx4* ins, MSimdBinaryComp* mir,
+                         MDefinition* lhs, MDefinition* rhs)
+    {
+        return lowerForFPU(ins, mir, lhs, rhs);
+    }
+
+    void lowerForBitAndAndBranch(LBitAndAndBranch* baab, MInstruction* mir,
+                                 MDefinition* lhs, MDefinition* rhs);
+    void lowerTruncateDToInt32(MTruncateToInt32* ins);
+    void lowerTruncateFToInt32(MTruncateToInt32* ins);
+    void lowerDivI(MDiv* div);
+    void lowerModI(MMod* mod);
+    void lowerDivI64(MDiv* div);
+    void lowerModI64(MMod* mod);
+    void lowerMulI(MMul* mul, MDefinition* lhs, MDefinition* rhs);
+    void lowerUDiv(MDiv* div);
+    void lowerUMod(MMod* mod);
+    void visitPowHalf(MPowHalf* ins);
+    void visitAsmJSNeg(MAsmJSNeg* ins);
+    void visitWasmSelect(MWasmSelect* ins);
+
+    LTableSwitchV* newLTableSwitchV(MTableSwitch* ins);
+    LTableSwitch* newLTableSwitch(const LAllocation& in,
+                                  const LDefinition& inputCopy,
+                                  MTableSwitch* ins);
+
+  public:
+    void visitBox(MBox* box);
+    void visitUnbox(MUnbox* unbox);
+    void visitReturn(MReturn* ret);
+    void lowerPhi(MPhi* phi);
+    void visitGuardShape(MGuardShape* ins);
+    void visitGuardObjectGroup(MGuardObjectGroup* ins);
+    void visitWasmUnsignedToDouble(MWasmUnsignedToDouble* ins);
+    void visitWasmUnsignedToFloat32(MWasmUnsignedToFloat32* ins);
+    void visitAsmJSLoadHeap(MAsmJSLoadHeap* ins);
+    void visitAsmJSStoreHeap(MAsmJSStoreHeap* ins);
+    void visitAsmJSCompareExchangeHeap(MAsmJSCompareExchangeHeap* ins);
+    void visitAsmJSAtomicExchangeHeap(MAsmJSAtomicExchangeHeap* ins);
+    void visitAsmJSAtomicBinopHeap(MAsmJSAtomicBinopHeap* ins);
+    void visitStoreTypedArrayElementStatic(MStoreTypedArrayElementStatic* ins);
+    void visitCompareExchangeTypedArrayElement(MCompareExchangeTypedArrayElement* ins);
+    void visitAtomicExchangeTypedArrayElement(MAtomicExchangeTypedArrayElement* ins);
+    void visitAtomicTypedArrayElementBinop(MAtomicTypedArrayElementBinop* ins);
+    void visitSubstr(MSubstr* ins);
+    void visitRandom(MRandom* ins);
+    void visitWasmTruncateToInt64(MWasmTruncateToInt64* ins);
+    void visitWasmLoad(MWasmLoad* ins);
+    void visitWasmStore(MWasmStore* ins);
+    void visitInt64ToFloatingPoint(MInt64ToFloatingPoint* ins);
+    void visitCopySign(MCopySign* ins);
+    void visitExtendInt32ToInt64(MExtendInt32ToInt64* ins);
+};
+
+typedef LIRGeneratorARM64 LIRGeneratorSpecific;
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_arm64_Lowering_arm64_h */