Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

11 files changed, 1359 insertions, 0 deletions

diff --git a/js/src/jit/none/Architecture-none.h b/js/src/jit/none/Architecture-none.h
new file mode 100644
index 0000000000..2433234fbf
--- /dev/null
+++ b/js/src/jit/none/Architecture-none.h
@@ -0,0 +1,171 @@
+/* -*- 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_none_Architecture_none_h
+#define jit_none_Architecture_none_h
+
+// JitSpewer.h is included through MacroAssembler implementations for other
+// platforms, so include it here to avoid inadvertent build bustage.
+#include "jit/JitSpewer.h"
+
+#include "jit/shared/Architecture-shared.h"
+
+namespace js {
+namespace jit {
+
+static const uint32_t SimdMemoryAlignment =
+    4;  // Make it 4 to avoid a bunch of div-by-zero warnings
+static const uint32_t WasmStackAlignment = 8;
+static const uint32_t WasmTrapInstructionLength = 0;
+
+// See comments in wasm::GenerateFunctionPrologue.
+static constexpr uint32_t WasmCheckedCallEntryOffset = 0u;
+
+class Registers {
+ public:
+  enum RegisterID {
+    r0 = 0,
+    invalid_reg,
+    invalid_reg2,  // To avoid silly static_assert failures.
+  };
+  typedef uint8_t Code;
+  typedef RegisterID Encoding;
+  union RegisterContent {
+    uintptr_t r;
+  };
+
+  typedef uint8_t SetType;
+
+  static uint32_t SetSize(SetType) { MOZ_CRASH(); }
+  static uint32_t FirstBit(SetType) { MOZ_CRASH(); }
+  static uint32_t LastBit(SetType) { MOZ_CRASH(); }
+  static const char* GetName(Code) { MOZ_CRASH(); }
+  static Code FromName(const char*) { MOZ_CRASH(); }
+
+  static const Encoding StackPointer = invalid_reg;
+  static const Encoding Invalid = invalid_reg;
+  static const uint32_t Total = 1;
+  static const uint32_t TotalPhys = 0;
+  static const uint32_t Allocatable = 0;
+  static const SetType AllMask = 0;
+  static const SetType ArgRegMask = 0;
+  static const SetType VolatileMask = 0;
+  static const SetType NonVolatileMask = 0;
+  static const SetType NonAllocatableMask = 0;
+  static const SetType AllocatableMask = 0;
+  static const SetType JSCallMask = 0;
+  static const SetType CallMask = 0;
+};
+
+typedef uint8_t PackedRegisterMask;
+
+class FloatRegisters {
+ public:
+  enum FPRegisterID { f0 = 0, invalid_reg };
+  typedef FPRegisterID Code;
+  typedef FPRegisterID Encoding;
+  union RegisterContent {
+    float s;
+    double d;
+  };
+
+  typedef uint32_t SetType;
+
+  static const char* GetName(Code) { MOZ_CRASH(); }
+  static Code FromName(const char*) { MOZ_CRASH(); }
+
+  static const Code Invalid = invalid_reg;
+  static const uint32_t Total = 0;
+  static const uint32_t TotalPhys = 0;
+  static const uint32_t Allocatable = 0;
+  static const SetType AllMask = 0;
+  static const SetType AllDoubleMask = 0;
+  static const SetType AllSingleMask = 0;
+  static const SetType VolatileMask = 0;
+  static const SetType NonVolatileMask = 0;
+  static const SetType NonAllocatableMask = 0;
+  static const SetType AllocatableMask = 0;
+};
+
+template <typename T>
+class TypedRegisterSet;
+
+struct FloatRegister {
+  typedef FloatRegisters Codes;
+  typedef Codes::Code Code;
+  typedef Codes::Encoding Encoding;
+  typedef Codes::SetType SetType;
+
+  Code _;
+
+  static uint32_t FirstBit(SetType) { MOZ_CRASH(); }
+  static uint32_t LastBit(SetType) { MOZ_CRASH(); }
+  static FloatRegister FromCode(uint32_t) { MOZ_CRASH(); }
+  bool isSingle() const { MOZ_CRASH(); }
+  bool isDouble() const { MOZ_CRASH(); }
+  bool isSimd128() const { MOZ_CRASH(); }
+  bool isInvalid() const { MOZ_CRASH(); }
+  FloatRegister asSingle() const { MOZ_CRASH(); }
+  FloatRegister asDouble() const { MOZ_CRASH(); }
+  FloatRegister asSimd128() const { MOZ_CRASH(); }
+  Code code() const { MOZ_CRASH(); }
+  Encoding encoding() const { MOZ_CRASH(); }
+  const char* name() const { MOZ_CRASH(); }
+  bool volatile_() const { MOZ_CRASH(); }
+  bool operator!=(FloatRegister) const { MOZ_CRASH(); }
+  bool operator==(FloatRegister) const { MOZ_CRASH(); }
+  bool aliases(FloatRegister) const { MOZ_CRASH(); }
+  uint32_t numAliased() const { MOZ_CRASH(); }
+  FloatRegister aliased(uint32_t) { MOZ_CRASH(); }
+  bool equiv(FloatRegister) const { MOZ_CRASH(); }
+  uint32_t size() const { MOZ_CRASH(); }
+  uint32_t numAlignedAliased() const { MOZ_CRASH(); }
+  FloatRegister alignedAliased(uint32_t) { MOZ_CRASH(); }
+  SetType alignedOrDominatedAliasedSet() const { MOZ_CRASH(); }
+
+  static constexpr RegTypeName DefaultType = RegTypeName::Float64;
+
+  template <RegTypeName = DefaultType>
+  static SetType LiveAsIndexableSet(SetType s) {
+    return SetType(0);
+  }
+
+  template <RegTypeName Name = DefaultType>
+  static SetType AllocatableAsIndexableSet(SetType s) {
+    static_assert(Name != RegTypeName::Any, "Allocatable set are not iterable");
+    return SetType(0);
+  }
+
+  template <typename T>
+  static T ReduceSetForPush(T) {
+    MOZ_CRASH();
+  }
+  uint32_t getRegisterDumpOffsetInBytes() { MOZ_CRASH(); }
+  static uint32_t SetSize(SetType x) { MOZ_CRASH(); }
+  static Code FromName(const char* name) { MOZ_CRASH(); }
+
+  // This is used in static initializers, so produce a bogus value instead of
+  // crashing.
+  static uint32_t GetPushSizeInBytes(const TypedRegisterSet<FloatRegister>&) {
+    return 0;
+  }
+};
+
+inline bool hasUnaliasedDouble() { MOZ_CRASH(); }
+inline bool hasMultiAlias() { MOZ_CRASH(); }
+
+static const uint32_t ShadowStackSpace = 0;
+static const uint32_t JumpImmediateRange = INT32_MAX;
+
+#ifdef JS_NUNBOX32
+static const int32_t NUNBOX32_TYPE_OFFSET = 4;
+static const int32_t NUNBOX32_PAYLOAD_OFFSET = 0;
+#endif
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_Architecture_none_h */
diff --git a/js/src/jit/none/Assembler-none.h b/js/src/jit/none/Assembler-none.h
new file mode 100644
index 0000000000..4c16334703
--- /dev/null
+++ b/js/src/jit/none/Assembler-none.h
@@ -0,0 +1,220 @@
+/* -*- 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_none_Assembler_none_h
+#define jit_none_Assembler_none_h
+
+#include "mozilla/Assertions.h"
+
+#include <stdint.h>
+
+#include "jit/none/Architecture-none.h"
+#include "jit/Registers.h"
+#include "jit/RegisterSets.h"
+#include "jit/shared/Assembler-shared.h"
+
+namespace js {
+namespace jit {
+
+class MacroAssembler;
+
+static constexpr Register StackPointer{Registers::invalid_reg};
+static constexpr Register FramePointer{Registers::invalid_reg};
+static constexpr Register ReturnReg{Registers::invalid_reg2};
+static constexpr FloatRegister ReturnFloat32Reg = {FloatRegisters::invalid_reg};
+static constexpr FloatRegister ReturnDoubleReg = {FloatRegisters::invalid_reg};
+static constexpr FloatRegister ReturnSimd128Reg = {FloatRegisters::invalid_reg};
+static constexpr FloatRegister ScratchSimd128Reg = {
+    FloatRegisters::invalid_reg};
+static constexpr FloatRegister InvalidFloatReg = {FloatRegisters::invalid_reg};
+
+struct ScratchFloat32Scope : FloatRegister {
+  explicit ScratchFloat32Scope(MacroAssembler& masm) {}
+};
+
+struct ScratchDoubleScope : FloatRegister {
+  explicit ScratchDoubleScope(MacroAssembler& masm) {}
+};
+
+static constexpr Register OsrFrameReg{Registers::invalid_reg};
+static constexpr Register PreBarrierReg{Registers::invalid_reg};
+static constexpr Register InterpreterPCReg{Registers::invalid_reg};
+static constexpr Register CallTempReg0{Registers::invalid_reg};
+static constexpr Register CallTempReg1{Registers::invalid_reg};
+static constexpr Register CallTempReg2{Registers::invalid_reg};
+static constexpr Register CallTempReg3{Registers::invalid_reg};
+static constexpr Register CallTempReg4{Registers::invalid_reg};
+static constexpr Register CallTempReg5{Registers::invalid_reg};
+static constexpr Register InvalidReg{Registers::invalid_reg};
+static constexpr Register CallTempNonArgRegs[] = {InvalidReg, InvalidReg};
+static const uint32_t NumCallTempNonArgRegs = std::size(CallTempNonArgRegs);
+
+static constexpr Register IntArgReg0{Registers::invalid_reg};
+static constexpr Register IntArgReg1{Registers::invalid_reg};
+static constexpr Register IntArgReg2{Registers::invalid_reg};
+static constexpr Register IntArgReg3{Registers::invalid_reg};
+static constexpr Register HeapReg{Registers::invalid_reg};
+
+static constexpr Register RegExpMatcherRegExpReg{Registers::invalid_reg};
+static constexpr Register RegExpMatcherStringReg{Registers::invalid_reg};
+static constexpr Register RegExpMatcherLastIndexReg{Registers::invalid_reg};
+
+static constexpr Register RegExpExecTestRegExpReg{Registers::invalid_reg};
+static constexpr Register RegExpExecTestStringReg{Registers::invalid_reg};
+
+static constexpr Register RegExpSearcherRegExpReg{Registers::invalid_reg};
+static constexpr Register RegExpSearcherStringReg{Registers::invalid_reg};
+static constexpr Register RegExpSearcherLastIndexReg{Registers::invalid_reg};
+
+// Uses |invalid_reg2| to avoid static_assert failures.
+static constexpr Register JSReturnReg_Type{Registers::invalid_reg2};
+static constexpr Register JSReturnReg_Data{Registers::invalid_reg2};
+static constexpr Register JSReturnReg{Registers::invalid_reg2};
+
+#if defined(JS_NUNBOX32)
+static constexpr ValueOperand JSReturnOperand(InvalidReg, InvalidReg);
+static constexpr Register64 ReturnReg64(InvalidReg, InvalidReg);
+#elif defined(JS_PUNBOX64)
+static constexpr ValueOperand JSReturnOperand(InvalidReg);
+static constexpr Register64 ReturnReg64(InvalidReg);
+#else
+#  error "Bad architecture"
+#endif
+
+static constexpr Register ABINonArgReg0{Registers::invalid_reg};
+static constexpr Register ABINonArgReg1{Registers::invalid_reg};
+static constexpr Register ABINonArgReg2{Registers::invalid_reg};
+static constexpr Register ABINonArgReg3{Registers::invalid_reg};
+static constexpr Register ABINonArgReturnReg0{Registers::invalid_reg};
+static constexpr Register ABINonArgReturnReg1{Registers::invalid_reg};
+static constexpr Register ABINonVolatileReg{Registers::invalid_reg};
+static constexpr Register ABINonArgReturnVolatileReg{Registers::invalid_reg};
+
+static constexpr FloatRegister ABINonArgDoubleReg = {
+    FloatRegisters::invalid_reg};
+
+static constexpr Register WasmTableCallScratchReg0{Registers::invalid_reg};
+static constexpr Register WasmTableCallScratchReg1{Registers::invalid_reg};
+static constexpr Register WasmTableCallSigReg{Registers::invalid_reg};
+static constexpr Register WasmTableCallIndexReg{Registers::invalid_reg};
+static constexpr Register InstanceReg{Registers::invalid_reg};
+static constexpr Register WasmJitEntryReturnScratch{Registers::invalid_reg};
+static constexpr Register WasmCallRefCallScratchReg0{Registers::invalid_reg};
+static constexpr Register WasmCallRefCallScratchReg1{Registers::invalid_reg};
+static constexpr Register WasmCallRefReg{Registers::invalid_reg};
+static constexpr Register WasmTailCallInstanceScratchReg{
+    Registers::invalid_reg};
+static constexpr Register WasmTailCallRAScratchReg{Registers::invalid_reg};
+static constexpr Register WasmTailCallFPScratchReg{Registers::invalid_reg};
+
+static constexpr uint32_t ABIStackAlignment = 4;
+static constexpr uint32_t CodeAlignment = 16;
+#ifdef ENABLE_PORTABLE_BASELINE_INTERP
+static constexpr uint32_t JitStackAlignment = sizeof(void*);
+static constexpr uint32_t JitStackValueAlignment = 1;
+#else
+static constexpr uint32_t JitStackAlignment = 8;
+static constexpr uint32_t JitStackValueAlignment =
+    JitStackAlignment / sizeof(Value);
+#endif
+
+static const Scale ScalePointer = TimesOne;
+
+class Assembler : public AssemblerShared {
+ public:
+  enum Condition {
+    Equal,
+    NotEqual,
+    Above,
+    AboveOrEqual,
+    Below,
+    BelowOrEqual,
+    GreaterThan,
+    GreaterThanOrEqual,
+    LessThan,
+    LessThanOrEqual,
+    Overflow,
+    CarrySet,
+    CarryClear,
+    Signed,
+    NotSigned,
+    Zero,
+    NonZero,
+    Always,
+  };
+
+  enum DoubleCondition {
+    DoubleOrdered,
+    DoubleEqual,
+    DoubleNotEqual,
+    DoubleGreaterThan,
+    DoubleGreaterThanOrEqual,
+    DoubleLessThan,
+    DoubleLessThanOrEqual,
+    DoubleUnordered,
+    DoubleEqualOrUnordered,
+    DoubleNotEqualOrUnordered,
+    DoubleGreaterThanOrUnordered,
+    DoubleGreaterThanOrEqualOrUnordered,
+    DoubleLessThanOrUnordered,
+    DoubleLessThanOrEqualOrUnordered
+  };
+
+  static Condition InvertCondition(Condition) { MOZ_CRASH(); }
+
+  static DoubleCondition InvertCondition(DoubleCondition) { MOZ_CRASH(); }
+
+  template <typename T, typename S>
+  static void PatchDataWithValueCheck(CodeLocationLabel, T, S) {
+    MOZ_CRASH();
+  }
+  static void PatchWrite_Imm32(CodeLocationLabel, Imm32) { MOZ_CRASH(); }
+
+  static void PatchWrite_NearCall(CodeLocationLabel, CodeLocationLabel) {
+    MOZ_CRASH();
+  }
+  static uint32_t PatchWrite_NearCallSize() { MOZ_CRASH(); }
+
+  static void ToggleToJmp(CodeLocationLabel) { MOZ_CRASH(); }
+  static void ToggleToCmp(CodeLocationLabel) { MOZ_CRASH(); }
+  static void ToggleCall(CodeLocationLabel, bool) { MOZ_CRASH(); }
+
+  static void Bind(uint8_t*, const CodeLabel&) { MOZ_CRASH(); }
+
+  static uintptr_t GetPointer(uint8_t*) { MOZ_CRASH(); }
+
+  static bool HasRoundInstruction(RoundingMode) { return false; }
+
+  void verifyHeapAccessDisassembly(uint32_t begin, uint32_t end,
+                                   const Disassembler::HeapAccess& heapAccess) {
+    MOZ_CRASH();
+  }
+
+  void setUnlimitedBuffer() { MOZ_CRASH(); }
+};
+
+class Operand {
+ public:
+  explicit Operand(const Address&) { MOZ_CRASH(); }
+  explicit Operand(const Register) { MOZ_CRASH(); }
+  explicit Operand(const FloatRegister) { MOZ_CRASH(); }
+  explicit Operand(Register, Imm32) { MOZ_CRASH(); }
+  explicit Operand(Register, int32_t) { MOZ_CRASH(); }
+};
+
+class ABIArgGenerator {
+ public:
+  ABIArgGenerator() { MOZ_CRASH(); }
+  ABIArg next(MIRType) { MOZ_CRASH(); }
+  ABIArg& current() { MOZ_CRASH(); }
+  uint32_t stackBytesConsumedSoFar() const { MOZ_CRASH(); }
+  void increaseStackOffset(uint32_t) { MOZ_CRASH(); }
+};
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_Assembler_none_h */
diff --git a/js/src/jit/none/CodeGenerator-none.h b/js/src/jit/none/CodeGenerator-none.h
new file mode 100644
index 0000000000..6efd71555e
--- /dev/null
+++ b/js/src/jit/none/CodeGenerator-none.h
@@ -0,0 +1,78 @@
+/* -*- 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_none_CodeGenerator_none_h
+#define jit_none_CodeGenerator_none_h
+
+#include "jit/shared/CodeGenerator-shared.h"
+
+namespace js {
+namespace jit {
+
+class CodeGeneratorNone : public CodeGeneratorShared {
+ protected:
+  CodeGeneratorNone(MIRGenerator* gen, LIRGraph* graph, MacroAssembler* masm)
+      : CodeGeneratorShared(gen, graph, masm) {
+    MOZ_CRASH();
+  }
+
+  MoveOperand toMoveOperand(LAllocation) const { MOZ_CRASH(); }
+  template <typename T1, typename T2>
+  void bailoutCmp32(Assembler::Condition, T1, T2, LSnapshot*) {
+    MOZ_CRASH();
+  }
+  template <typename T1, typename T2>
+  void bailoutTest32(Assembler::Condition, T1, T2, LSnapshot*) {
+    MOZ_CRASH();
+  }
+  template <typename T1, typename T2>
+  void bailoutCmpPtr(Assembler::Condition, T1, T2, LSnapshot*) {
+    MOZ_CRASH();
+  }
+  void bailoutTestPtr(Assembler::Condition, Register, Register, LSnapshot*) {
+    MOZ_CRASH();
+  }
+  void bailoutIfFalseBool(Register, LSnapshot*) { MOZ_CRASH(); }
+  void bailoutFrom(Label*, LSnapshot*) { MOZ_CRASH(); }
+  void bailout(LSnapshot*) { MOZ_CRASH(); }
+  void bailoutIf(Assembler::Condition, LSnapshot*) { MOZ_CRASH(); }
+  bool generateOutOfLineCode() { MOZ_CRASH(); }
+  void testNullEmitBranch(Assembler::Condition, ValueOperand, MBasicBlock*,
+                          MBasicBlock*) {
+    MOZ_CRASH();
+  }
+  void testUndefinedEmitBranch(Assembler::Condition, ValueOperand, MBasicBlock*,
+                               MBasicBlock*) {
+    MOZ_CRASH();
+  }
+  void testObjectEmitBranch(Assembler::Condition, ValueOperand, MBasicBlock*,
+                            MBasicBlock*) {
+    MOZ_CRASH();
+  }
+  void testZeroEmitBranch(Assembler::Condition, Register, MBasicBlock*,
+                          MBasicBlock*) {
+    MOZ_CRASH();
+  }
+  void emitTableSwitchDispatch(MTableSwitch*, Register, Register) {
+    MOZ_CRASH();
+  }
+  void emitBigIntDiv(LBigIntDiv*, Register, Register, Register, Label*) {
+    MOZ_CRASH();
+  }
+  void emitBigIntMod(LBigIntMod*, Register, Register, Register, Label*) {
+    MOZ_CRASH();
+  }
+  ValueOperand ToValue(LInstruction*, size_t) { MOZ_CRASH(); }
+  ValueOperand ToTempValue(LInstruction*, size_t) { MOZ_CRASH(); }
+  void generateInvalidateEpilogue() { MOZ_CRASH(); }
+};
+
+typedef CodeGeneratorNone CodeGeneratorSpecific;
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_CodeGenerator_none_h */
diff --git a/js/src/jit/none/LIR-none.h b/js/src/jit/none/LIR-none.h
new file mode 100644
index 0000000000..c04578630e
--- /dev/null
+++ b/js/src/jit/none/LIR-none.h
@@ -0,0 +1,111 @@
+/* -*- 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_none_LIR_none_h
+#define jit_none_LIR_none_h
+
+namespace js {
+namespace jit {
+
+class LUnboxFloatingPoint : public LInstruction {
+ public:
+  LIR_HEADER(UnboxFloatingPoint)
+  static const size_t Input = 0;
+
+  MUnbox* mir() const { MOZ_CRASH(); }
+
+  const LDefinition* output() const { MOZ_CRASH(); }
+  MIRType type() const { MOZ_CRASH(); }
+};
+
+class LTableSwitch : public LInstruction {
+ public:
+  LIR_HEADER(TableSwitch)
+  MTableSwitch* mir() { MOZ_CRASH(); }
+
+  const LAllocation* index() { MOZ_CRASH(); }
+  const LDefinition* tempInt() { MOZ_CRASH(); }
+  const LDefinition* tempPointer() { MOZ_CRASH(); }
+};
+
+class LTableSwitchV : public LInstruction {
+ public:
+  LIR_HEADER(TableSwitchV)
+  MTableSwitch* mir() { MOZ_CRASH(); }
+
+  const LDefinition* tempInt() { MOZ_CRASH(); }
+  const LDefinition* tempFloat() { MOZ_CRASH(); }
+  const LDefinition* tempPointer() { MOZ_CRASH(); }
+
+  static const size_t InputValue = 0;
+};
+
+class LWasmUint32ToFloat32 : public LInstructionHelper<1, 1, 0> {
+ public:
+  explicit LWasmUint32ToFloat32(const LAllocation&)
+      : LInstructionHelper(Opcode::Invalid) {
+    MOZ_CRASH();
+  }
+};
+
+class LUnbox : public LInstructionHelper<1, 2, 0> {
+ public:
+  MUnbox* mir() const { MOZ_CRASH(); }
+  const LAllocation* payload() { MOZ_CRASH(); }
+  const LAllocation* type() { MOZ_CRASH(); }
+  const char* extraName() const { MOZ_CRASH(); }
+};
+class LDivI : public LBinaryMath<1> {
+ public:
+  LDivI(const LAllocation&, const LAllocation&, const LDefinition&)
+      : LBinaryMath(Opcode::Invalid) {
+    MOZ_CRASH();
+  }
+  MDiv* mir() const { MOZ_CRASH(); }
+};
+class LDivPowTwoI : public LInstructionHelper<1, 1, 0> {
+ public:
+  LDivPowTwoI(const LAllocation&, int32_t)
+      : LInstructionHelper(Opcode::Invalid) {
+    MOZ_CRASH();
+  }
+  const LAllocation* numerator() { MOZ_CRASH(); }
+  int32_t shift() { MOZ_CRASH(); }
+  MDiv* mir() const { MOZ_CRASH(); }
+};
+class LModI : public LBinaryMath<1> {
+ public:
+  LModI(const LAllocation&, const LAllocation&, const LDefinition&)
+      : LBinaryMath(Opcode::Invalid) {
+    MOZ_CRASH();
+  }
+
+  const LDefinition* callTemp() { MOZ_CRASH(); }
+  MMod* mir() const { MOZ_CRASH(); }
+};
+class LWasmUint32ToDouble : public LInstructionHelper<1, 1, 0> {
+ public:
+  explicit LWasmUint32ToDouble(const LAllocation&)
+      : LInstructionHelper(Opcode::Invalid) {
+    MOZ_CRASH();
+  }
+};
+class LModPowTwoI : public LInstructionHelper<1, 1, 0> {
+ public:
+  int32_t shift() { MOZ_CRASH(); }
+  LModPowTwoI(const LAllocation& lhs, int32_t shift)
+      : LInstructionHelper(Opcode::Invalid) {
+    MOZ_CRASH();
+  }
+  MMod* mir() const { MOZ_CRASH(); }
+};
+
+class LMulI : public LInstruction {};
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_LIR_none_h */
diff --git a/js/src/jit/none/Lowering-none.h b/js/src/jit/none/Lowering-none.h
new file mode 100644
index 0000000000..ad804b970b
--- /dev/null
+++ b/js/src/jit/none/Lowering-none.h
@@ -0,0 +1,130 @@
+/* -*- 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_none_Lowering_none_h
+#define jit_none_Lowering_none_h
+
+#include "jit/shared/Lowering-shared.h"
+
+namespace js {
+namespace jit {
+
+class LIRGeneratorNone : public LIRGeneratorShared {
+ protected:
+  LIRGeneratorNone(MIRGenerator* gen, MIRGraph& graph, LIRGraph& lirGraph)
+      : LIRGeneratorShared(gen, graph, lirGraph) {
+    MOZ_CRASH();
+  }
+
+  LBoxAllocation useBoxFixed(MDefinition*, Register, Register,
+                             bool useAtStart = false) {
+    MOZ_CRASH();
+  }
+
+  LAllocation useByteOpRegister(MDefinition*) { MOZ_CRASH(); }
+  LAllocation useByteOpRegisterAtStart(MDefinition*) { MOZ_CRASH(); }
+  LAllocation useByteOpRegisterOrNonDoubleConstant(MDefinition*) {
+    MOZ_CRASH();
+  }
+  LDefinition tempByteOpRegister() { MOZ_CRASH(); }
+  LDefinition tempToUnbox() { MOZ_CRASH(); }
+  bool needTempForPostBarrier() { MOZ_CRASH(); }
+  void lowerUntypedPhiInput(MPhi*, uint32_t, LBlock*, size_t) { MOZ_CRASH(); }
+  void lowerInt64PhiInput(MPhi*, uint32_t, LBlock*, size_t) { MOZ_CRASH(); }
+  void defineInt64Phi(MPhi*, size_t) { MOZ_CRASH(); }
+  void lowerForShift(LInstructionHelper<1, 2, 0>*, MDefinition*, MDefinition*,
+                     MDefinition*) {
+    MOZ_CRASH();
+  }
+  void lowerUrshD(MUrsh*) { MOZ_CRASH(); }
+  void lowerPowOfTwoI(MPow*) { MOZ_CRASH(); }
+  template <typename T>
+  void lowerForALU(T, MDefinition*, MDefinition*, MDefinition* v = nullptr) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void lowerForFPU(T, MDefinition*, MDefinition*, MDefinition* v = nullptr) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void lowerForALUInt64(T, MDefinition*, MDefinition*,
+                        MDefinition* v = nullptr) {
+    MOZ_CRASH();
+  }
+  void lowerForMulInt64(LMulI64*, MMul*, MDefinition*,
+                        MDefinition* v = nullptr) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void lowerForShiftInt64(T, MDefinition*, MDefinition*,
+                          MDefinition* v = nullptr) {
+    MOZ_CRASH();
+  }
+  void lowerForBitAndAndBranch(LBitAndAndBranch*, MInstruction*, MDefinition*,
+                               MDefinition*) {
+    MOZ_CRASH();
+  }
+  void lowerForCompareI64AndBranch(MTest*, MCompare*, JSOp, MDefinition*,
+                                   MDefinition*, MBasicBlock*, MBasicBlock*) {
+    MOZ_CRASH();
+  }
+
+  void lowerConstantDouble(double, MInstruction*) { MOZ_CRASH(); }
+  void lowerConstantFloat32(float, MInstruction*) { MOZ_CRASH(); }
+  void lowerTruncateDToInt32(MTruncateToInt32*) { MOZ_CRASH(); }
+  void lowerTruncateFToInt32(MTruncateToInt32*) { MOZ_CRASH(); }
+  void lowerBuiltinInt64ToFloatingPoint(MBuiltinInt64ToFloatingPoint* ins) {
+    MOZ_CRASH();
+  }
+  void lowerWasmBuiltinTruncateToInt64(MWasmBuiltinTruncateToInt64* ins) {
+    MOZ_CRASH();
+  }
+  void lowerWasmBuiltinTruncateToInt32(MWasmBuiltinTruncateToInt32* ins) {
+    MOZ_CRASH();
+  }
+  void lowerDivI(MDiv*) { MOZ_CRASH(); }
+  void lowerModI(MMod*) { MOZ_CRASH(); }
+  void lowerDivI64(MDiv*) { MOZ_CRASH(); }
+  void lowerWasmBuiltinDivI64(MWasmBuiltinDivI64* div) { MOZ_CRASH(); }
+  void lowerModI64(MMod*) { MOZ_CRASH(); }
+  void lowerWasmBuiltinModI64(MWasmBuiltinModI64* mod) { MOZ_CRASH(); }
+  void lowerNegI(MInstruction*, MDefinition*) { MOZ_CRASH(); }
+  void lowerNegI64(MInstruction*, MDefinition*) { MOZ_CRASH(); }
+  void lowerMulI(MMul*, MDefinition*, MDefinition*) { MOZ_CRASH(); }
+  void lowerUDiv(MDiv*) { MOZ_CRASH(); }
+  void lowerUMod(MMod*) { MOZ_CRASH(); }
+  void lowerWasmSelectI(MWasmSelect* select) { MOZ_CRASH(); }
+  void lowerWasmSelectI64(MWasmSelect* select) { MOZ_CRASH(); }
+  void lowerWasmCompareAndSelect(MWasmSelect* ins, MDefinition* lhs,
+                                 MDefinition* rhs, MCompare::CompareType compTy,
+                                 JSOp jsop) {
+    MOZ_CRASH();
+  }
+  bool canSpecializeWasmCompareAndSelect(MCompare::CompareType compTy,
+                                         MIRType insTy) {
+    MOZ_CRASH();
+  }
+
+  void lowerBigIntLsh(MBigIntLsh*) { MOZ_CRASH(); }
+  void lowerBigIntRsh(MBigIntRsh*) { MOZ_CRASH(); }
+  void lowerBigIntDiv(MBigIntDiv*) { MOZ_CRASH(); }
+  void lowerBigIntMod(MBigIntMod*) { MOZ_CRASH(); }
+
+  void lowerAtomicLoad64(MLoadUnboxedScalar*) { MOZ_CRASH(); }
+  void lowerAtomicStore64(MStoreUnboxedScalar*) { MOZ_CRASH(); }
+
+  LTableSwitch* newLTableSwitch(LAllocation, LDefinition, MTableSwitch*) {
+    MOZ_CRASH();
+  }
+  LTableSwitchV* newLTableSwitchV(MTableSwitch*) { MOZ_CRASH(); }
+};
+
+typedef LIRGeneratorNone LIRGeneratorSpecific;
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_Lowering_none_h */
diff --git a/js/src/jit/none/MacroAssembler-none.h b/js/src/jit/none/MacroAssembler-none.h
new file mode 100644
index 0000000000..fb9e757631
--- /dev/null
+++ b/js/src/jit/none/MacroAssembler-none.h
@@ -0,0 +1,479 @@
+/* -*- 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_none_MacroAssembler_none_h
+#define jit_none_MacroAssembler_none_h
+
+#include <iterator>
+
+#include "jit/MoveResolver.h"
+#include "jit/none/Assembler-none.h"
+#include "wasm/WasmCodegenTypes.h"
+#include "wasm/WasmTypeDecls.h"
+
+using js::wasm::FaultingCodeOffsetPair;
+
+namespace js {
+namespace jit {
+
+class CompactBufferReader;
+
+class ScratchTagScope {
+ public:
+  ScratchTagScope(MacroAssembler&, const ValueOperand) {}
+  operator Register() { MOZ_CRASH(); }
+  void release() { MOZ_CRASH(); }
+  void reacquire() { MOZ_CRASH(); }
+};
+
+class ScratchTagScopeRelease {
+ public:
+  explicit ScratchTagScopeRelease(ScratchTagScope*) {}
+};
+
+class MacroAssemblerNone : public Assembler {
+ public:
+  MacroAssemblerNone() { MOZ_CRASH(); }
+
+  MoveResolver moveResolver_;
+
+  size_t size() const { MOZ_CRASH(); }
+  size_t bytesNeeded() const { MOZ_CRASH(); }
+  size_t jumpRelocationTableBytes() const { MOZ_CRASH(); }
+  size_t dataRelocationTableBytes() const { MOZ_CRASH(); }
+  size_t preBarrierTableBytes() const { MOZ_CRASH(); }
+
+  size_t numCodeLabels() const { MOZ_CRASH(); }
+  CodeLabel codeLabel(size_t) { MOZ_CRASH(); }
+
+  bool reserve(size_t size) { MOZ_CRASH(); }
+  bool appendRawCode(const uint8_t* code, size_t numBytes) { MOZ_CRASH(); }
+  bool swapBuffer(wasm::Bytes& bytes) { MOZ_CRASH(); }
+
+  void assertNoGCThings() const { MOZ_CRASH(); }
+
+  static void TraceJumpRelocations(JSTracer*, JitCode*, CompactBufferReader&) {
+    MOZ_CRASH();
+  }
+  static void TraceDataRelocations(JSTracer*, JitCode*, CompactBufferReader&) {
+    MOZ_CRASH();
+  }
+
+  static bool SupportsFloatingPoint() { return false; }
+  static bool SupportsUnalignedAccesses() { return false; }
+  static bool SupportsFastUnalignedFPAccesses() { return false; }
+
+  void executableCopy(void*, bool = true) { MOZ_CRASH(); }
+  void copyJumpRelocationTable(uint8_t*) { MOZ_CRASH(); }
+  void copyDataRelocationTable(uint8_t*) { MOZ_CRASH(); }
+  void copyPreBarrierTable(uint8_t*) { MOZ_CRASH(); }
+  void processCodeLabels(uint8_t*) { MOZ_CRASH(); }
+
+  void flushBuffer() { MOZ_CRASH(); }
+
+  template <typename T>
+  void bind(T) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void j(Condition, T) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void jump(T) {
+    MOZ_CRASH();
+  }
+  void writeCodePointer(CodeLabel* label) { MOZ_CRASH(); }
+  void haltingAlign(size_t) { MOZ_CRASH(); }
+  void nopAlign(size_t) { MOZ_CRASH(); }
+  void checkStackAlignment() { MOZ_CRASH(); }
+  uint32_t currentOffset() { MOZ_CRASH(); }
+
+  void nop() { MOZ_CRASH(); }
+  void breakpoint() { MOZ_CRASH(); }
+  void abiret() { MOZ_CRASH(); }
+  void ret() { MOZ_CRASH(); }
+
+  CodeOffset toggledJump(Label*) { MOZ_CRASH(); }
+  CodeOffset toggledCall(JitCode*, bool) { MOZ_CRASH(); }
+  static size_t ToggledCallSize(uint8_t*) { MOZ_CRASH(); }
+
+  void finish() { MOZ_CRASH(); }
+
+  template <typename T, typename S>
+  void moveValue(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S, typename U>
+  void moveValue(T, S, U) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void storeValue(const T&, const S&) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S, typename U>
+  void storeValue(T, S, U) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void storePrivateValue(const T&, const S&) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void loadValue(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void loadUnalignedValue(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void pushValue(const T&) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void pushValue(T, S) {
+    MOZ_CRASH();
+  }
+  void popValue(ValueOperand) { MOZ_CRASH(); }
+  void tagValue(JSValueType, Register, ValueOperand) { MOZ_CRASH(); }
+  void retn(Imm32 n) { MOZ_CRASH(); }
+  template <typename T>
+  void push(const T&) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void Push(T) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void pop(T) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void Pop(T) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  CodeOffset pushWithPatch(T) {
+    MOZ_CRASH();
+  }
+
+  void testNullSet(Condition, ValueOperand, Register) { MOZ_CRASH(); }
+  void testObjectSet(Condition, ValueOperand, Register) { MOZ_CRASH(); }
+  void testUndefinedSet(Condition, ValueOperand, Register) { MOZ_CRASH(); }
+
+  template <typename T, typename S>
+  void cmpPtrSet(Condition, T, S, Register) {
+    MOZ_CRASH();
+  }
+  void cmp8Set(Condition, Address, Imm32, Register) { MOZ_CRASH(); }
+  void cmp16Set(Condition, Address, Imm32, Register) { MOZ_CRASH(); }
+  template <typename T, typename S>
+  void cmp32Set(Condition, T, S, Register) {
+    MOZ_CRASH();
+  }
+  void cmp64Set(Condition, Address, Imm64, Register) { MOZ_CRASH(); }
+
+  template <typename T>
+  void mov(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void movePtr(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void move32(const T&, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void movq(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void moveFloat32(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void moveDouble(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void move64(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  CodeOffset movWithPatch(T, Register) {
+    MOZ_CRASH();
+  }
+
+  template <typename T>
+  FaultingCodeOffset loadPtr(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  FaultingCodeOffset load32(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void load32Unaligned(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  FaultingCodeOffset loadFloat32(T, FloatRegister) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  FaultingCodeOffset loadDouble(T, FloatRegister) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void loadPrivate(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  FaultingCodeOffset load8SignExtend(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  FaultingCodeOffset load8ZeroExtend(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  FaultingCodeOffset load16SignExtend(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void load16UnalignedSignExtend(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  FaultingCodeOffset load16ZeroExtend(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void load16UnalignedZeroExtend(T, Register) {
+    MOZ_CRASH();
+  }
+#ifdef JS_64BIT
+  template <typename T>
+  FaultingCodeOffset load64(T, Register64) {
+    MOZ_CRASH();
+  }
+#else
+  template <typename T>
+  FaultingCodeOffsetPair load64(T, Register64) {
+    MOZ_CRASH();
+  }
+#endif
+  template <typename T>
+  void load64Unaligned(T, Register64) {
+    MOZ_CRASH();
+  }
+
+  template <typename T, typename S>
+  FaultingCodeOffset storePtr(const T&, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  FaultingCodeOffset store32(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void store32Unaligned(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void storeFloat32(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void storeDouble(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  FaultingCodeOffset store8(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  FaultingCodeOffset store16(T, S) {
+    MOZ_CRASH();
+  }
+  template <typename T, typename S>
+  void store16Unaligned(T, S) {
+    MOZ_CRASH();
+  }
+#ifdef JS_64BIT
+  template <typename T, typename S>
+  FaultingCodeOffset store64(T, S) {
+    MOZ_CRASH();
+  }
+#else
+  template <typename T, typename S>
+  FaultingCodeOffsetPair store64(T, S) {
+    MOZ_CRASH();
+  }
+#endif
+  template <typename T, typename S>
+  void store64Unaligned(T, S) {
+    MOZ_CRASH();
+  }
+
+  template <typename T>
+  void computeEffectiveAddress(T, Register) {
+    MOZ_CRASH();
+  }
+
+  void splitTagForTest(ValueOperand, ScratchTagScope&) { MOZ_CRASH(); }
+
+  void boxDouble(FloatRegister, ValueOperand, FloatRegister) { MOZ_CRASH(); }
+  void boxNonDouble(JSValueType, Register, ValueOperand) { MOZ_CRASH(); }
+  template <typename T>
+  void boxDouble(FloatRegister src, const T& dest) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void unboxInt32(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void unboxBoolean(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void unboxString(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void unboxSymbol(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void unboxBigInt(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void unboxObject(T, Register) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void unboxDouble(T, FloatRegister) {
+    MOZ_CRASH();
+  }
+  void unboxValue(const ValueOperand&, AnyRegister, JSValueType) {
+    MOZ_CRASH();
+  }
+  void unboxNonDouble(const ValueOperand&, Register, JSValueType) {
+    MOZ_CRASH();
+  }
+  void unboxNonDouble(const Address&, Register, JSValueType) { MOZ_CRASH(); }
+  template <typename T>
+  void unboxGCThingForGCBarrier(const T&, Register) {
+    MOZ_CRASH();
+  }
+
+  template <typename T>
+  void unboxWasmAnyRefGCThingForGCBarrier(const T&, Register) {
+    MOZ_CRASH();
+  }
+
+  void getWasmAnyRefGCThingChunk(Register, Register) { MOZ_CRASH(); }
+
+  template <typename T>
+  void unboxObjectOrNull(const T& src, Register dest) {
+    MOZ_CRASH();
+  }
+  void notBoolean(ValueOperand) { MOZ_CRASH(); }
+  [[nodiscard]] Register extractObject(Address, Register) { MOZ_CRASH(); }
+  [[nodiscard]] Register extractObject(ValueOperand, Register) { MOZ_CRASH(); }
+  [[nodiscard]] Register extractSymbol(ValueOperand, Register) { MOZ_CRASH(); }
+  [[nodiscard]] Register extractInt32(ValueOperand, Register) { MOZ_CRASH(); }
+  [[nodiscard]] Register extractBoolean(ValueOperand, Register) { MOZ_CRASH(); }
+  template <typename T>
+  [[nodiscard]] Register extractTag(T, Register) {
+    MOZ_CRASH();
+  }
+
+  void convertFloat32ToInt32(FloatRegister, Register, Label*, bool v = true) {
+    MOZ_CRASH();
+  }
+  void convertDoubleToInt32(FloatRegister, Register, Label*, bool v = true) {
+    MOZ_CRASH();
+  }
+  void convertDoubleToPtr(FloatRegister, Register, Label*, bool v = true) {
+    MOZ_CRASH();
+  }
+  void convertBoolToInt32(Register, Register) { MOZ_CRASH(); }
+
+  void convertDoubleToFloat32(FloatRegister, FloatRegister) { MOZ_CRASH(); }
+  void convertInt32ToFloat32(Register, FloatRegister) { MOZ_CRASH(); }
+
+  template <typename T>
+  void convertInt32ToDouble(T, FloatRegister) {
+    MOZ_CRASH();
+  }
+  void convertFloat32ToDouble(FloatRegister, FloatRegister) { MOZ_CRASH(); }
+
+  void boolValueToDouble(ValueOperand, FloatRegister) { MOZ_CRASH(); }
+  void boolValueToFloat32(ValueOperand, FloatRegister) { MOZ_CRASH(); }
+  void int32ValueToDouble(ValueOperand, FloatRegister) { MOZ_CRASH(); }
+  void int32ValueToFloat32(ValueOperand, FloatRegister) { MOZ_CRASH(); }
+
+  void loadConstantDouble(double, FloatRegister) { MOZ_CRASH(); }
+  void loadConstantFloat32(float, FloatRegister) { MOZ_CRASH(); }
+  Condition testInt32Truthy(bool, ValueOperand) { MOZ_CRASH(); }
+  Condition testStringTruthy(bool, ValueOperand) { MOZ_CRASH(); }
+  Condition testBigIntTruthy(bool, ValueOperand) { MOZ_CRASH(); }
+
+  template <typename T>
+  void loadUnboxedValue(T, MIRType, AnyRegister) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void storeUnboxedValue(const ConstantOrRegister&, MIRType, T) {
+    MOZ_CRASH();
+  }
+  template <typename T>
+  void storeUnboxedPayload(ValueOperand value, T, size_t, JSValueType) {
+    MOZ_CRASH();
+  }
+
+  void convertUInt32ToDouble(Register, FloatRegister) { MOZ_CRASH(); }
+  void convertUInt32ToFloat32(Register, FloatRegister) { MOZ_CRASH(); }
+  void incrementInt32Value(Address) { MOZ_CRASH(); }
+  void ensureDouble(ValueOperand, FloatRegister, Label*) { MOZ_CRASH(); }
+  void handleFailureWithHandlerTail(Label*, Label*) { MOZ_CRASH(); }
+
+  void buildFakeExitFrame(Register, uint32_t*) { MOZ_CRASH(); }
+  bool buildOOLFakeExitFrame(void*) { MOZ_CRASH(); }
+
+  void setPrinter(Sprinter*) { MOZ_CRASH(); }
+  Operand ToPayload(Operand base) { MOZ_CRASH(); }
+  Address ToPayload(Address) { MOZ_CRASH(); }
+
+  Register getStackPointer() const { MOZ_CRASH(); }
+
+  // Instrumentation for entering and leaving the profiler.
+  void profilerEnterFrame(Register, Register) { MOZ_CRASH(); }
+  void profilerExitFrame() { MOZ_CRASH(); }
+
+#ifdef JS_NUNBOX32
+  Address ToType(Address) { MOZ_CRASH(); }
+#endif
+};
+
+typedef MacroAssemblerNone MacroAssemblerSpecific;
+
+static inline bool GetTempRegForIntArg(uint32_t, uint32_t, Register*) {
+  MOZ_CRASH();
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_MacroAssembler_none_h */
diff --git a/js/src/jit/none/MoveEmitter-none.h b/js/src/jit/none/MoveEmitter-none.h
new file mode 100644
index 0000000000..39e60bfaee
--- /dev/null
+++ b/js/src/jit/none/MoveEmitter-none.h
@@ -0,0 +1,32 @@
+/* -*- 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_none_MoveEmitter_none_h
+#define jit_none_MoveEmitter_none_h
+
+#include "mozilla/Assertions.h"
+
+namespace js {
+namespace jit {
+
+class MacroAssemblerNone;
+class MoveResolver;
+struct Register;
+
+class MoveEmitterNone {
+ public:
+  explicit MoveEmitterNone(MacroAssemblerNone&) { MOZ_CRASH(); }
+  void emit(const MoveResolver&) { MOZ_CRASH(); }
+  void finish() { MOZ_CRASH(); }
+  void setScratchRegister(Register) { MOZ_CRASH(); }
+};
+
+typedef MoveEmitterNone MoveEmitter;
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_MoveEmitter_none_h */
diff --git a/js/src/jit/none/SharedICHelpers-none-inl.h b/js/src/jit/none/SharedICHelpers-none-inl.h
new file mode 100644
index 0000000000..2d63956ba7
--- /dev/null
+++ b/js/src/jit/none/SharedICHelpers-none-inl.h
@@ -0,0 +1,31 @@
+/* -*- 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_none_SharedICHelpers_none_inl_h
+#define jit_none_SharedICHelpers_none_inl_h
+
+#include "jit/SharedICHelpers.h"
+
+namespace js {
+namespace jit {
+
+inline void EmitBaselineTailCallVM(TrampolinePtr, MacroAssembler&, uint32_t) {
+  MOZ_CRASH();
+}
+inline void EmitBaselineCreateStubFrameDescriptor(MacroAssembler&, Register,
+                                                  uint32_t) {
+  MOZ_CRASH();
+}
+inline void EmitBaselineCallVM(TrampolinePtr, MacroAssembler&) { MOZ_CRASH(); }
+
+inline void EmitBaselineEnterStubFrame(MacroAssembler&, Register) {
+  MOZ_CRASH();
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_SharedICHelpers_none_inl_h */
diff --git a/js/src/jit/none/SharedICHelpers-none.h b/js/src/jit/none/SharedICHelpers-none.h
new file mode 100644
index 0000000000..8c2b4ee396
--- /dev/null
+++ b/js/src/jit/none/SharedICHelpers-none.h
@@ -0,0 +1,32 @@
+/* -*- 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_none_SharedICHelpers_none_h
+#define jit_none_SharedICHelpers_none_h
+
+namespace js {
+namespace jit {
+
+static const size_t ICStackValueOffset = 0;
+
+inline void EmitRestoreTailCallReg(MacroAssembler&) { MOZ_CRASH(); }
+inline void EmitRepushTailCallReg(MacroAssembler&) { MOZ_CRASH(); }
+inline void EmitCallIC(MacroAssembler&, CodeOffset*) { MOZ_CRASH(); }
+inline void EmitReturnFromIC(MacroAssembler&) { MOZ_CRASH(); }
+inline void EmitBaselineLeaveStubFrame(MacroAssembler&, bool v = false) {
+  MOZ_CRASH();
+}
+inline void EmitStubGuardFailure(MacroAssembler&) { MOZ_CRASH(); }
+
+template <typename T>
+inline void EmitPreBarrier(MacroAssembler&, T, MIRType) {
+  MOZ_CRASH();
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_SharedICHelpers_none_h */
diff --git a/js/src/jit/none/SharedICRegisters-none.h b/js/src/jit/none/SharedICRegisters-none.h
new file mode 100644
index 0000000000..170e5058a9
--- /dev/null
+++ b/js/src/jit/none/SharedICRegisters-none.h
@@ -0,0 +1,32 @@
+/* -*- 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_none_SharedICRegisters_none_h
+#define jit_none_SharedICRegisters_none_h
+
+#include "jit/none/MacroAssembler-none.h"
+#include "jit/Registers.h"
+#include "jit/RegisterSets.h"
+
+namespace js {
+namespace jit {
+
+static constexpr ValueOperand R0 = JSReturnOperand;
+static constexpr ValueOperand R1 = JSReturnOperand;
+static constexpr ValueOperand R2 = JSReturnOperand;
+
+static constexpr Register ICTailCallReg{Registers::invalid_reg};
+static constexpr Register ICStubReg{Registers::invalid_reg};
+
+static constexpr FloatRegister FloatReg0 = {FloatRegisters::invalid_reg};
+static constexpr FloatRegister FloatReg1 = {FloatRegisters::invalid_reg};
+static constexpr FloatRegister FloatReg2 = {FloatRegisters::invalid_reg};
+static constexpr FloatRegister FloatReg3 = {FloatRegisters::invalid_reg};
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_none_SharedICRegisters_none_h */
diff --git a/js/src/jit/none/Trampoline-none.cpp b/js/src/jit/none/Trampoline-none.cpp
new file mode 100644
index 0000000000..33265a2341
--- /dev/null
+++ b/js/src/jit/none/Trampoline-none.cpp
@@ -0,0 +1,43 @@
+/* -*- 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/. */
+
+#include "jit/Bailouts.h"
+#include "jit/BaselineIC.h"
+#include "jit/JitRuntime.h"
+#include "vm/Realm.h"
+
+using namespace js;
+using namespace js::jit;
+
+// This file includes stubs for generating the JIT trampolines when there is no
+// JIT backend, and also includes implementations for assorted random things
+// which can't be implemented in headers.
+
+void JitRuntime::generateEnterJIT(JSContext*, MacroAssembler&) { MOZ_CRASH(); }
+// static
+mozilla::Maybe<::JS::ProfilingFrameIterator::RegisterState>
+JitRuntime::getCppEntryRegisters(JitFrameLayout* frameStackAddress) {
+  return mozilla::Nothing{};
+}
+void JitRuntime::generateInvalidator(MacroAssembler&, Label*) { MOZ_CRASH(); }
+void JitRuntime::generateArgumentsRectifier(MacroAssembler&,
+                                            ArgumentsRectifierKind kind) {
+  MOZ_CRASH();
+}
+void JitRuntime::generateBailoutHandler(MacroAssembler&, Label*) {
+  MOZ_CRASH();
+}
+uint32_t JitRuntime::generatePreBarrier(JSContext*, MacroAssembler&, MIRType) {
+  MOZ_CRASH();
+}
+void JitRuntime::generateBailoutTailStub(MacroAssembler&, Label*) {
+  MOZ_CRASH();
+}
+
+bool JitRuntime::generateVMWrapper(JSContext*, MacroAssembler&, VMFunctionId,
+                                   const VMFunctionData&, DynFn, uint32_t*) {
+  MOZ_CRASH();
+}