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diff --git a/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.h b/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.h
new file mode 100644
index 000000000000..413d0d1dc554
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+++ b/contrib/llvm-project/llvm/lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.h
@@ -0,0 +1,235 @@
+// WebAssemblyMachineFunctionInfo.h-WebAssembly machine function info-*- C++ -*-
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file declares WebAssembly-specific per-machine-function
+/// information.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
+#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
+
+#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
+#include "llvm/CodeGen/MIRYamlMapping.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/MC/MCSymbolWasm.h"
+
+namespace llvm {
+
+struct WasmEHFuncInfo;
+
+namespace yaml {
+struct WebAssemblyFunctionInfo;
+}
+
+/// This class is derived from MachineFunctionInfo and contains private
+/// WebAssembly-specific information for each MachineFunction.
+class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
+  const MachineFunction &MF;
+
+  std::vector<MVT> Params;
+  std::vector<MVT> Results;
+  std::vector<MVT> Locals;
+
+  /// A mapping from CodeGen vreg index to WebAssembly register number.
+  std::vector<unsigned> WARegs;
+
+  /// A mapping from CodeGen vreg index to a boolean value indicating whether
+  /// the given register is considered to be "stackified", meaning it has been
+  /// determined or made to meet the stack requirements:
+  ///   - single use (per path)
+  ///   - single def (per path)
+  ///   - defined and used in LIFO order with other stack registers
+  BitVector VRegStackified;
+
+  // A virtual register holding the pointer to the vararg buffer for vararg
+  // functions. It is created and set in TLI::LowerFormalArguments and read by
+  // TLI::LowerVASTART
+  unsigned VarargVreg = -1U;
+
+  // A virtual register holding the base pointer for functions that have
+  // overaligned values on the user stack.
+  unsigned BasePtrVreg = -1U;
+  // A virtual register holding the frame base. This is either FP or SP
+  // after it has been replaced by a vreg
+  unsigned FrameBaseVreg = -1U;
+  // The local holding the frame base. This is either FP or SP
+  // after WebAssemblyExplicitLocals
+  unsigned FrameBaseLocal = -1U;
+
+  // Function properties.
+  bool CFGStackified = false;
+
+  // Catchpad unwind destination info for wasm EH.
+  WasmEHFuncInfo *WasmEHInfo = nullptr;
+
+public:
+  explicit WebAssemblyFunctionInfo(MachineFunction &MF)
+      : MF(MF), WasmEHInfo(MF.getWasmEHFuncInfo()) {}
+  ~WebAssemblyFunctionInfo() override;
+
+  const MachineFunction &getMachineFunction() const { return MF; }
+
+  void initializeBaseYamlFields(const yaml::WebAssemblyFunctionInfo &YamlMFI);
+
+  void addParam(MVT VT) { Params.push_back(VT); }
+  const std::vector<MVT> &getParams() const { return Params; }
+
+  void addResult(MVT VT) { Results.push_back(VT); }
+  const std::vector<MVT> &getResults() const { return Results; }
+
+  void clearParamsAndResults() {
+    Params.clear();
+    Results.clear();
+  }
+
+  void setNumLocals(size_t NumLocals) { Locals.resize(NumLocals, MVT::i32); }
+  void setLocal(size_t i, MVT VT) { Locals[i] = VT; }
+  void addLocal(MVT VT) { Locals.push_back(VT); }
+  const std::vector<MVT> &getLocals() const { return Locals; }
+
+  unsigned getVarargBufferVreg() const {
+    assert(VarargVreg != -1U && "Vararg vreg hasn't been set");
+    return VarargVreg;
+  }
+  void setVarargBufferVreg(unsigned Reg) { VarargVreg = Reg; }
+
+  unsigned getBasePointerVreg() const {
+    assert(BasePtrVreg != -1U && "Base ptr vreg hasn't been set");
+    return BasePtrVreg;
+  }
+  void setFrameBaseVreg(unsigned Reg) { FrameBaseVreg = Reg; }
+  unsigned getFrameBaseVreg() const {
+    assert(FrameBaseVreg != -1U && "Frame base vreg hasn't been set");
+    return FrameBaseVreg;
+  }
+  void clearFrameBaseVreg() { FrameBaseVreg = -1U; }
+  // Return true if the frame base physreg has been replaced by a virtual reg.
+  bool isFrameBaseVirtual() const { return FrameBaseVreg != -1U; }
+  void setFrameBaseLocal(unsigned Local) { FrameBaseLocal = Local; }
+  unsigned getFrameBaseLocal() const {
+    assert(FrameBaseLocal != -1U && "Frame base local hasn't been set");
+    return FrameBaseLocal;
+  }
+  void setBasePointerVreg(unsigned Reg) { BasePtrVreg = Reg; }
+
+  static const unsigned UnusedReg = -1u;
+
+  void stackifyVReg(MachineRegisterInfo &MRI, unsigned VReg) {
+    assert(MRI.getUniqueVRegDef(VReg));
+    auto I = Register::virtReg2Index(VReg);
+    if (I >= VRegStackified.size())
+      VRegStackified.resize(I + 1);
+    VRegStackified.set(I);
+  }
+  void unstackifyVReg(unsigned VReg) {
+    auto I = Register::virtReg2Index(VReg);
+    if (I < VRegStackified.size())
+      VRegStackified.reset(I);
+  }
+  bool isVRegStackified(unsigned VReg) const {
+    auto I = Register::virtReg2Index(VReg);
+    if (I >= VRegStackified.size())
+      return false;
+    return VRegStackified.test(I);
+  }
+
+  void initWARegs(MachineRegisterInfo &MRI);
+  void setWAReg(unsigned VReg, unsigned WAReg) {
+    assert(WAReg != UnusedReg);
+    auto I = Register::virtReg2Index(VReg);
+    assert(I < WARegs.size());
+    WARegs[I] = WAReg;
+  }
+  unsigned getWAReg(unsigned VReg) const {
+    auto I = Register::virtReg2Index(VReg);
+    assert(I < WARegs.size());
+    return WARegs[I];
+  }
+
+  // For a given stackified WAReg, return the id number to print with push/pop.
+  static unsigned getWARegStackId(unsigned Reg) {
+    assert(Reg & INT32_MIN);
+    return Reg & INT32_MAX;
+  }
+
+  bool isCFGStackified() const { return CFGStackified; }
+  void setCFGStackified(bool Value = true) { CFGStackified = Value; }
+
+  WasmEHFuncInfo *getWasmEHFuncInfo() const { return WasmEHInfo; }
+  void setWasmEHFuncInfo(WasmEHFuncInfo *Info) { WasmEHInfo = Info; }
+};
+
+void computeLegalValueVTs(const WebAssemblyTargetLowering &TLI,
+                          LLVMContext &Ctx, const DataLayout &DL, Type *Ty,
+                          SmallVectorImpl<MVT> &ValueVTs);
+
+void computeLegalValueVTs(const Function &F, const TargetMachine &TM, Type *Ty,
+                          SmallVectorImpl<MVT> &ValueVTs);
+
+// Compute the signature for a given FunctionType (Ty). Note that it's not the
+// signature for ContextFunc (ContextFunc is just used to get varous context)
+void computeSignatureVTs(const FunctionType *Ty, const Function *TargetFunc,
+                         const Function &ContextFunc, const TargetMachine &TM,
+                         SmallVectorImpl<MVT> &Params,
+                         SmallVectorImpl<MVT> &Results);
+
+void valTypesFromMVTs(const ArrayRef<MVT> &In,
+                      SmallVectorImpl<wasm::ValType> &Out);
+
+std::unique_ptr<wasm::WasmSignature>
+signatureFromMVTs(const SmallVectorImpl<MVT> &Results,
+                  const SmallVectorImpl<MVT> &Params);
+
+namespace yaml {
+
+using BBNumberMap = DenseMap<int, int>;
+
+struct WebAssemblyFunctionInfo final : public yaml::MachineFunctionInfo {
+  std::vector<FlowStringValue> Params;
+  std::vector<FlowStringValue> Results;
+  bool CFGStackified = false;
+  // The same as WasmEHFuncInfo's SrcToUnwindDest, but stored in the mapping of
+  // BB numbers
+  BBNumberMap SrcToUnwindDest;
+
+  WebAssemblyFunctionInfo() = default;
+  WebAssemblyFunctionInfo(const llvm::WebAssemblyFunctionInfo &MFI);
+
+  void mappingImpl(yaml::IO &YamlIO) override;
+  ~WebAssemblyFunctionInfo() = default;
+};
+
+template <> struct MappingTraits<WebAssemblyFunctionInfo> {
+  static void mapping(IO &YamlIO, WebAssemblyFunctionInfo &MFI) {
+    YamlIO.mapOptional("params", MFI.Params, std::vector<FlowStringValue>());
+    YamlIO.mapOptional("results", MFI.Results, std::vector<FlowStringValue>());
+    YamlIO.mapOptional("isCFGStackified", MFI.CFGStackified, false);
+    YamlIO.mapOptional("wasmEHFuncInfo", MFI.SrcToUnwindDest);
+  }
+};
+
+template <> struct CustomMappingTraits<BBNumberMap> {
+  static void inputOne(IO &YamlIO, StringRef Key,
+                       BBNumberMap &SrcToUnwindDest) {
+    YamlIO.mapRequired(Key.str().c_str(),
+                       SrcToUnwindDest[std::atoi(Key.str().c_str())]);
+  }
+
+  static void output(IO &YamlIO, BBNumberMap &SrcToUnwindDest) {
+    for (auto KV : SrcToUnwindDest)
+      YamlIO.mapRequired(std::to_string(KV.first).c_str(), KV.second);
+  }
+};
+
+} // end namespace yaml
+
+} // end namespace llvm
+
+#endif