diff --git a/llvm/include/llvm/ExecutionEngine/Orc/MemoryMapper.h b/llvm/include/llvm/ExecutionEngine/Orc/MemoryMapper.h
--- a/llvm/include/llvm/ExecutionEngine/Orc/MemoryMapper.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/MemoryMapper.h
@@ -109,6 +109,47 @@
   AllocationMap Allocations;
 };
 
+class SharedMemoryMapper final : public MemoryMapper {
+public:
+  struct SymbolAddrs {
+    ExecutorAddr Instance;
+    ExecutorAddr Reserve;
+    ExecutorAddr Initialize;
+    ExecutorAddr Deinitialize;
+    ExecutorAddr Release;
+  };
+
+  SharedMemoryMapper(ExecutorProcessControl &EPC, SymbolAddrs SAs)
+      : EPC(EPC), SAs(SAs) {}
+
+  void reserve(size_t NumBytes, OnReservedFunction OnReserved) override;
+
+  char *prepare(ExecutorAddr Addr, size_t ContentSize) override;
+
+  void initialize(AllocInfo &AI, OnInitializedFunction OnInitialized) override;
+
+  void deinitialize(ArrayRef<ExecutorAddr> Allocations,
+                    OnDeinitializedFunction OnDeInitialized) override;
+
+  void release(ArrayRef<ExecutorAddr> Reservations,
+               OnReleasedFunction OnRelease) override;
+
+  ~SharedMemoryMapper() override;
+
+private:
+  struct Reservation {
+    void *LocalAddr;
+    size_t Size;
+  };
+
+  ExecutorProcessControl &EPC;
+  SymbolAddrs SAs;
+
+  std::mutex Mutex;
+
+  std::map<ExecutorAddr, Reservation> Reservations;
+};
+
 } // namespace orc
 } // end namespace llvm
 
diff --git a/llvm/include/llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h b/llvm/include/llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h
--- a/llvm/include/llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h
@@ -31,6 +31,12 @@
 extern const char *SimpleExecutorMemoryManagerFinalizeWrapperName;
 extern const char *SimpleExecutorMemoryManagerDeallocateWrapperName;
 
+extern const char *ExecutorSharedMemoryMapperServiceInstanceName;
+extern const char *ExecutorSharedMemoryMapperServiceReserveWrapperName;
+extern const char *ExecutorSharedMemoryMapperServiceInitializeWrapperName;
+extern const char *ExecutorSharedMemoryMapperServiceDeinitializeWrapperName;
+extern const char *ExecutorSharedMemoryMapperServiceReleaseWrapperName;
+
 extern const char *MemoryWriteUInt8sWrapperName;
 extern const char *MemoryWriteUInt16sWrapperName;
 extern const char *MemoryWriteUInt32sWrapperName;
@@ -58,6 +64,21 @@
 using SPSSimpleExecutorMemoryManagerDeallocateSignature = shared::SPSError(
     shared::SPSExecutorAddr, shared::SPSSequence<shared::SPSExecutorAddr>);
 
+// ExecutorSharedMemoryMapperService
+using SPSExecutorSharedMemoryMapperServiceReserveSignature =
+    shared::SPSExpected<
+        shared::SPSTuple<shared::SPSExecutorAddr, shared::SPSString>>(
+        shared::SPSExecutorAddr, uint64_t);
+using SPSExecutorSharedMemoryMapperServiceInitializeSignature =
+    shared::SPSExpected<shared::SPSExecutorAddr>(
+        shared::SPSExecutorAddr, shared::SPSExecutorAddr,
+        shared::SPSSharedMemoryFinalizeRequest);
+using SPSExecutorSharedMemoryMapperServiceDeinitializeSignature =
+    shared::SPSError(shared::SPSExecutorAddr,
+                     shared::SPSSequence<shared::SPSExecutorAddr>);
+using SPSExecutorSharedMemoryMapperServiceReleaseSignature = shared::SPSError(
+    shared::SPSExecutorAddr, shared::SPSSequence<shared::SPSExecutorAddr>);
+
 using SPSRunAsMainSignature = int64_t(shared::SPSExecutorAddr,
                                       shared::SPSSequence<shared::SPSString>);
 
diff --git a/llvm/include/llvm/ExecutionEngine/Orc/Shared/TargetProcessControlTypes.h b/llvm/include/llvm/ExecutionEngine/Orc/Shared/TargetProcessControlTypes.h
--- a/llvm/include/llvm/ExecutionEngine/Orc/Shared/TargetProcessControlTypes.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/Shared/TargetProcessControlTypes.h
@@ -82,6 +82,17 @@
   shared::AllocActions Actions;
 };
 
+struct SharedMemorySegFinalizeRequest {
+  WireProtectionFlags Prot;
+  ExecutorAddr Addr;
+  uint64_t Size;
+};
+
+struct SharedMemoryFinalizeRequest {
+  std::vector<SharedMemorySegFinalizeRequest> Segments;
+  shared::AllocActions Actions;
+};
+
 template <typename T> struct UIntWrite {
   UIntWrite() = default;
   UIntWrite(ExecutorAddr Addr, T Value) : Addr(Addr), Value(Value) {}
@@ -131,6 +142,13 @@
 using SPSFinalizeRequest = SPSTuple<SPSSequence<SPSSegFinalizeRequest>,
                                     SPSSequence<SPSAllocActionCallPair>>;
 
+using SPSSharedMemorySegFinalizeRequest =
+    SPSTuple<SPSMemoryProtectionFlags, SPSExecutorAddr, uint64_t>;
+
+using SPSSharedMemoryFinalizeRequest =
+    SPSTuple<SPSSequence<SPSSharedMemorySegFinalizeRequest>,
+             SPSSequence<SPSAllocActionCallPair>>;
+
 template <typename T>
 using SPSMemoryAccessUIntWrite = SPSTuple<SPSExecutorAddr, T>;
 
@@ -204,6 +222,48 @@
   }
 };
 
+template <>
+class SPSSerializationTraits<SPSSharedMemorySegFinalizeRequest,
+                             tpctypes::SharedMemorySegFinalizeRequest> {
+  using SFRAL = SPSSharedMemorySegFinalizeRequest::AsArgList;
+
+public:
+  static size_t size(const tpctypes::SharedMemorySegFinalizeRequest &SFR) {
+    return SFRAL::size(SFR.Prot, SFR.Addr, SFR.Size);
+  }
+
+  static bool serialize(SPSOutputBuffer &OB,
+                        const tpctypes::SharedMemorySegFinalizeRequest &SFR) {
+    return SFRAL::serialize(OB, SFR.Prot, SFR.Addr, SFR.Size);
+  }
+
+  static bool deserialize(SPSInputBuffer &IB,
+                          tpctypes::SharedMemorySegFinalizeRequest &SFR) {
+    return SFRAL::deserialize(IB, SFR.Prot, SFR.Addr, SFR.Size);
+  }
+};
+
+template <>
+class SPSSerializationTraits<SPSSharedMemoryFinalizeRequest,
+                             tpctypes::SharedMemoryFinalizeRequest> {
+  using FRAL = SPSSharedMemoryFinalizeRequest::AsArgList;
+
+public:
+  static size_t size(const tpctypes::SharedMemoryFinalizeRequest &FR) {
+    return FRAL::size(FR.Segments, FR.Actions);
+  }
+
+  static bool serialize(SPSOutputBuffer &OB,
+                        const tpctypes::SharedMemoryFinalizeRequest &FR) {
+    return FRAL::serialize(OB, FR.Segments, FR.Actions);
+  }
+
+  static bool deserialize(SPSInputBuffer &IB,
+                          tpctypes::SharedMemoryFinalizeRequest &FR) {
+    return FRAL::deserialize(IB, FR.Segments, FR.Actions);
+  }
+};
+
 template <typename T>
 class SPSSerializationTraits<SPSMemoryAccessUIntWrite<T>,
                              tpctypes::UIntWrite<T>> {
@@ -244,7 +304,6 @@
   }
 };
 
-
 } // end namespace shared
 } // end namespace orc
 } // end namespace llvm
diff --git a/llvm/include/llvm/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.h b/llvm/include/llvm/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.h
new file mode 100644
--- /dev/null
+++ b/llvm/include/llvm/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.h
@@ -0,0 +1,78 @@
+//===----------- ExecutorSharedMemoryMapperService.h ------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_EXECUTORSHAREDMEMORYMAPPERSERVICE
+#define LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_EXECUTORSHAREDMEMORYMAPPERSERVICE
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ExecutionEngine/Orc/Shared/TargetProcessControlTypes.h"
+#include "llvm/ExecutionEngine/Orc/TargetProcess/ExecutorBootstrapService.h"
+
+#include <atomic>
+#include <mutex>
+
+#if defined(_WIN32)
+#include <windows.h>
+#endif
+
+namespace llvm {
+namespace orc {
+namespace rt_bootstrap {
+
+class ExecutorSharedMemoryMapperService final
+    : public ExecutorBootstrapService {
+public:
+  ~ExecutorSharedMemoryMapperService(){};
+
+  Expected<std::pair<ExecutorAddr, std::string>> reserve(uint64_t Size);
+  Expected<ExecutorAddr> initialize(ExecutorAddr Reservation,
+                                    tpctypes::SharedMemoryFinalizeRequest &FR);
+
+  Error deinitialize(const std::vector<ExecutorAddr> &Bases);
+  Error release(const std::vector<ExecutorAddr> &Bases);
+
+  Error shutdown() override;
+  void addBootstrapSymbols(StringMap<ExecutorAddr> &M) override;
+
+private:
+  struct Allocation {
+    std::vector<shared::WrapperFunctionCall> DeinitializationActions;
+  };
+  using AllocationMap = DenseMap<ExecutorAddr, Allocation>;
+
+  struct Reservation {
+    size_t Size;
+    std::vector<ExecutorAddr> Allocations;
+#if defined(_WIN32)
+    HANDLE SharedMemoryFile;
+#endif
+  };
+  using ReservationMap = DenseMap<void *, Reservation>;
+
+  static llvm::orc::shared::CWrapperFunctionResult
+  reserveWrapper(const char *ArgData, size_t ArgSize);
+
+  static llvm::orc::shared::CWrapperFunctionResult
+  initializeWrapper(const char *ArgData, size_t ArgSize);
+
+  static llvm::orc::shared::CWrapperFunctionResult
+  deinitializeWrapper(const char *ArgData, size_t ArgSize);
+
+  static llvm::orc::shared::CWrapperFunctionResult
+  releaseWrapper(const char *ArgData, size_t ArgSize);
+
+  std::atomic<int> SharedMemoryCount{0};
+  std::mutex Mutex;
+  ReservationMap Reservations;
+  AllocationMap Allocations;
+};
+
+} // namespace rt_bootstrap
+} // namespace orc
+} // namespace llvm
+#endif // LLVM_EXECUTIONENGINE_ORC_TARGETPROCESS_EXECUTORSHAREDMEMORYMAPPERSERVICE
diff --git a/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt b/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
--- a/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
+++ b/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
@@ -1,3 +1,7 @@
+if( CMAKE_HOST_UNIX AND HAVE_LIBRT )
+  set(rt_lib rt)
+endif()
+
 add_llvm_component_library(LLVMOrcJIT
   CompileOnDemandLayer.cpp
   CompileUtils.cpp
@@ -45,6 +49,7 @@
 
   LINK_LIBS
   ${LLVM_PTHREAD_LIB}
+  ${rt_lib}
 
   LINK_COMPONENTS
   Core
diff --git a/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp b/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp
--- a/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/MemoryMapper.cpp
@@ -8,6 +8,17 @@
 
 #include "llvm/ExecutionEngine/Orc/MemoryMapper.h"
 
+#include "llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h"
+#include "llvm/Support/WindowsError.h"
+
+#if defined(LLVM_ON_UNIX)
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#elif defined(_WIN32)
+#include <windows.h>
+#endif
+
 namespace llvm {
 namespace orc {
 
@@ -147,6 +158,225 @@
   cantFail(F.get());
 }
 
+// SharedMemoryMapper
+
+void SharedMemoryMapper::reserve(size_t NumBytes,
+                                 OnReservedFunction OnReserved) {
+#if defined(LLVM_ON_UNIX) || defined(_WIN32)
+
+  EPC.callSPSWrapperAsync<
+      rt::SPSExecutorSharedMemoryMapperServiceReserveSignature>(
+      SAs.Reserve,
+      [this, NumBytes, OnReserved = std::move(OnReserved)](
+          Error SerializationErr,
+          Expected<std::pair<ExecutorAddr, std::string>> Result) mutable {
+        if (SerializationErr) {
+          cantFail(Result.takeError());
+          return OnReserved(std::move(SerializationErr));
+        }
+
+        if (!Result)
+          return OnReserved(Result.takeError());
+
+        ExecutorAddr RemoteAddr;
+        std::string SharedMemoryName;
+        std::tie(RemoteAddr, SharedMemoryName) = std::move(*Result);
+
+        void *LocalAddr = nullptr;
+
+#if defined(LLVM_ON_UNIX)
+
+        int SharedMemoryFile = shm_open(SharedMemoryName.c_str(), O_RDWR, 0700);
+        if (SharedMemoryFile < 0) {
+          return OnReserved(errorCodeToError(
+              std::error_code(errno, std::generic_category())));
+        }
+
+        // this prevents other processes from accessing it by name
+        shm_unlink(SharedMemoryName.c_str());
+
+        LocalAddr = mmap(nullptr, NumBytes, PROT_READ | PROT_WRITE, MAP_SHARED,
+                         SharedMemoryFile, 0);
+        if (LocalAddr == MAP_FAILED) {
+          return OnReserved(errorCodeToError(
+              std::error_code(errno, std::generic_category())));
+        }
+
+        close(SharedMemoryFile);
+
+#elif defined(_WIN32)
+
+        std::wstring WideSharedMemoryName(SharedMemoryName.begin(),
+                                          SharedMemoryName.end());
+        HANDLE SharedMemoryFile = OpenFileMappingW(FILE_MAP_ALL_ACCESS, FALSE,
+                                                  WideSharedMemoryName.c_str());
+        if (!SharedMemoryFile)
+          return OnReserved(errorCodeToError(mapWindowsError(GetLastError())));
+
+        LocalAddr =
+            MapViewOfFile(SharedMemoryFile, FILE_MAP_ALL_ACCESS, 0, 0, 0);
+        if (!LocalAddr) {
+          CloseHandle(SharedMemoryFile);
+          return OnReserved(errorCodeToError(mapWindowsError(GetLastError())));
+        }
+
+        CloseHandle(SharedMemoryFile);
+
+#endif
+        {
+          std::lock_guard<std::mutex> Lock(Mutex);
+          Reservations.insert({RemoteAddr, {LocalAddr, NumBytes}});
+        }
+
+        OnReserved(ExecutorAddrRange(RemoteAddr, NumBytes));
+      },
+      SAs.Instance, static_cast<uint64_t>(NumBytes));
+
+#else
+  OnReserved(make_error<StringError>(
+      "SharedMemoryMapper is not supported on this platform yet",
+      inconvertibleErrorCode()));
+#endif
+}
+
+char *SharedMemoryMapper::prepare(ExecutorAddr Addr, size_t ContentSize) {
+  auto R = Reservations.upper_bound(Addr);
+  assert(R != Reservations.begin() && "Attempt to prepare unknown range");
+  R--;
+
+  ExecutorAddrDiff Offset = Addr - R->first;
+
+  return static_cast<char *>(R->second.LocalAddr) + Offset;
+}
+
+void SharedMemoryMapper::initialize(MemoryMapper::AllocInfo &AI,
+                                    OnInitializedFunction OnInitialized) {
+  auto Reservation = Reservations.find(AI.MappingBase);
+  assert(Reservation != Reservations.end() &&
+         "Attempt to initialize unreserved range");
+
+  tpctypes::SharedMemoryFinalizeRequest FR;
+
+  AI.Actions.swap(FR.Actions);
+
+  FR.Segments.reserve(AI.Segments.size());
+
+  for (auto Segment : AI.Segments) {
+    char *Base =
+        static_cast<char *>(Reservation->second.LocalAddr) + Segment.Offset;
+    std::memset(Base + Segment.ContentSize, 0, Segment.ZeroFillSize);
+
+    tpctypes::SharedMemorySegFinalizeRequest SegReq;
+    SegReq.Prot = tpctypes::toWireProtectionFlags(
+        static_cast<sys::Memory::ProtectionFlags>(Segment.Prot));
+    SegReq.Addr = AI.MappingBase + Segment.Offset;
+    SegReq.Size = Segment.ContentSize + Segment.ZeroFillSize;
+
+    FR.Segments.push_back(SegReq);
+  }
+
+  EPC.callSPSWrapperAsync<
+      rt::SPSExecutorSharedMemoryMapperServiceInitializeSignature>(
+      SAs.Initialize,
+      [OnInitialized = std::move(OnInitialized)](
+          Error SerializationErr, Expected<ExecutorAddr> Result) mutable {
+        if (SerializationErr) {
+          cantFail(Result.takeError());
+          return OnInitialized(std::move(SerializationErr));
+        }
+
+        OnInitialized(std::move(Result));
+      },
+      SAs.Instance, AI.MappingBase, std::move(FR));
+}
+
+void SharedMemoryMapper::deinitialize(
+    ArrayRef<ExecutorAddr> Allocations,
+    MemoryMapper::OnDeinitializedFunction OnDeinitialized) {
+  EPC.callSPSWrapperAsync<
+      rt::SPSExecutorSharedMemoryMapperServiceDeinitializeSignature>(
+      SAs.Deinitialize,
+      [OnDeinitialized = std::move(OnDeinitialized)](Error SerializationErr,
+                                                     Error Result) mutable {
+        if (SerializationErr) {
+          cantFail(std::move(Result));
+          return OnDeinitialized(std::move(SerializationErr));
+        }
+
+        OnDeinitialized(std::move(Result));
+      },
+      SAs.Instance, Allocations);
+}
+
+void SharedMemoryMapper::release(ArrayRef<ExecutorAddr> Bases,
+                                 OnReleasedFunction OnReleased) {
+#if defined(LLVM_ON_UNIX) || defined(_WIN32)
+  Error Err = Error::success();
+
+  {
+    std::lock_guard<std::mutex> Lock(Mutex);
+
+    for (auto Base : Bases) {
+
+#if defined(LLVM_ON_UNIX)
+
+      if (munmap(Reservations[Base].LocalAddr, Reservations[Base].Size) != 0)
+        Err = joinErrors(std::move(Err), errorCodeToError(std::error_code(
+                                             errno, std::generic_category())));
+
+#elif defined(_WIN32)
+
+      if (!UnmapViewOfFile(Reservations[Base].LocalAddr))
+        joinErrors(std::move(Err),
+                   errorCodeToError(mapWindowsError(GetLastError())));
+
+#endif
+
+      Reservations.erase(Base);
+    }
+  }
+
+  EPC.callSPSWrapperAsync<
+      rt::SPSExecutorSharedMemoryMapperServiceReleaseSignature>(
+      SAs.Release,
+      [OnReleased = std::move(OnReleased),
+       Err = std::move(Err)](Error SerializationErr, Error Result) mutable {
+        if (SerializationErr) {
+          cantFail(std::move(Result));
+          return OnReleased(
+              joinErrors(std::move(Err), std::move(SerializationErr)));
+        }
+
+        return OnReleased(joinErrors(std::move(Err), std::move(Result)));
+      },
+      SAs.Instance, Bases);
+#else
+  OnReleased(make_error<StringError>(
+      "SharedMemoryMapper is not supported on this platform yet",
+      inconvertibleErrorCode()));
+#endif
+}
+
+SharedMemoryMapper::~SharedMemoryMapper() {
+  std::vector<ExecutorAddr> ReservationAddrs;
+  if (!Reservations.empty()) {
+    std::lock_guard<std::mutex> Lock(Mutex);
+    {
+      ReservationAddrs.reserve(Reservations.size());
+      for (const auto &R : Reservations) {
+        ReservationAddrs.push_back(R.first);
+      }
+    }
+  }
+
+  std::promise<MSVCPError> P;
+  auto F = P.get_future();
+  release(ReservationAddrs, [&](Error Err) { P.set_value(std::move(Err)); });
+  // FIXME: Release can actually fail. The error should be propagated.
+  // Meanwhile, a better option is to explicitly call release().
+  cantFail(F.get());
+}
+
 } // namespace orc
 
 } // namespace llvm
diff --git a/llvm/lib/ExecutionEngine/Orc/Shared/OrcRTBridge.cpp b/llvm/lib/ExecutionEngine/Orc/Shared/OrcRTBridge.cpp
--- a/llvm/lib/ExecutionEngine/Orc/Shared/OrcRTBridge.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/Shared/OrcRTBridge.cpp
@@ -18,6 +18,7 @@
     "__llvm_orc_SimpleExecutorDylibManager_open_wrapper";
 const char *SimpleExecutorDylibManagerLookupWrapperName =
     "__llvm_orc_SimpleExecutorDylibManager_lookup_wrapper";
+
 const char *SimpleExecutorMemoryManagerInstanceName =
     "__llvm_orc_SimpleExecutorMemoryManager_Instance";
 const char *SimpleExecutorMemoryManagerReserveWrapperName =
@@ -26,6 +27,18 @@
     "__llvm_orc_SimpleExecutorMemoryManager_finalize_wrapper";
 const char *SimpleExecutorMemoryManagerDeallocateWrapperName =
     "__llvm_orc_SimpleExecutorMemoryManager_deallocate_wrapper";
+
+const char *ExecutorSharedMemoryMapperServiceInstanceName =
+    "__llvm_orc_ExecutorSharedMemoryMapperService_Instance";
+const char *ExecutorSharedMemoryMapperServiceReserveWrapperName =
+    "__llvm_orc_ExecutorSharedMemoryMapperService_Reserve";
+const char *ExecutorSharedMemoryMapperServiceInitializeWrapperName =
+    "__llvm_orc_ExecutorSharedMemoryMapperService_Initialize";
+const char *ExecutorSharedMemoryMapperServiceDeinitializeWrapperName =
+    "__llvm_orc_ExecutorSharedMemoryMapperService_Deinitialize";
+const char *ExecutorSharedMemoryMapperServiceReleaseWrapperName =
+    "__llvm_orc_ExecutorSharedMemoryMapperService_Release";
+
 const char *MemoryWriteUInt8sWrapperName =
     "__llvm_orc_bootstrap_mem_write_uint8s_wrapper";
 const char *MemoryWriteUInt16sWrapperName =
@@ -36,10 +49,12 @@
     "__llvm_orc_bootstrap_mem_write_uint64s_wrapper";
 const char *MemoryWriteBuffersWrapperName =
     "__llvm_orc_bootstrap_mem_write_buffers_wrapper";
+
 const char *RegisterEHFrameSectionWrapperName =
     "__llvm_orc_bootstrap_register_ehframe_section_wrapper";
 const char *DeregisterEHFrameSectionWrapperName =
     "__llvm_orc_bootstrap_deregister_ehframe_section_wrapper";
+
 const char *RunAsMainWrapperName = "__llvm_orc_bootstrap_run_as_main_wrapper";
 
 } // end namespace rt
diff --git a/llvm/lib/ExecutionEngine/Orc/TargetProcess/CMakeLists.txt b/llvm/lib/ExecutionEngine/Orc/TargetProcess/CMakeLists.txt
--- a/llvm/lib/ExecutionEngine/Orc/TargetProcess/CMakeLists.txt
+++ b/llvm/lib/ExecutionEngine/Orc/TargetProcess/CMakeLists.txt
@@ -1,4 +1,9 @@
+if( CMAKE_HOST_UNIX AND HAVE_LIBRT )
+  set(rt_lib rt)
+endif()
+
 add_llvm_component_library(LLVMOrcTargetProcess
+  ExecutorSharedMemoryMapperService.cpp
   JITLoaderGDB.cpp
   OrcRTBootstrap.cpp
   RegisterEHFrames.cpp
@@ -12,6 +17,7 @@
 
   LINK_LIBS
   ${LLVM_PTHREAD_LIB}
+  ${rt_lib}
 
   LINK_COMPONENTS
   OrcShared
diff --git a/llvm/lib/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.cpp b/llvm/lib/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.cpp
new file mode 100644
--- /dev/null
+++ b/llvm/lib/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.cpp
@@ -0,0 +1,341 @@
+//===---------- ExecutorSharedMemoryMapperService.cpp -----------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.h"
+
+#include "llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/WindowsError.h"
+
+#include <sstream>
+
+#if defined(LLVM_ON_UNIX)
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#endif
+
+#if defined(_WIN32)
+static DWORD getWindowsProtectionFlags(unsigned Flags) {
+  switch (Flags & llvm::sys::Memory::MF_RWE_MASK) {
+  case llvm::sys::Memory::MF_READ:
+    return PAGE_READONLY;
+  case llvm::sys::Memory::MF_WRITE:
+    // Note: PAGE_WRITE is not supported by VirtualProtect
+    return PAGE_READWRITE;
+  case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_WRITE:
+    return PAGE_READWRITE;
+  case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_EXEC:
+    return PAGE_EXECUTE_READ;
+  case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_WRITE |
+      llvm::sys::Memory::MF_EXEC:
+    return PAGE_EXECUTE_READWRITE;
+  case llvm::sys::Memory::MF_EXEC:
+    return PAGE_EXECUTE;
+  default:
+    llvm_unreachable("Illegal memory protection flag specified!");
+  }
+  // Provide a default return value as required by some compilers.
+  return PAGE_NOACCESS;
+}
+#endif
+
+namespace llvm {
+namespace orc {
+namespace rt_bootstrap {
+
+Expected<std::pair<ExecutorAddr, std::string>>
+ExecutorSharedMemoryMapperService::reserve(uint64_t Size) {
+#if defined(LLVM_ON_UNIX) || defined(_WIN32)
+
+#if defined(LLVM_ON_UNIX)
+
+  std::string SharedMemoryName;
+  {
+    std::stringstream SharedMemoryNameStream;
+    SharedMemoryNameStream << "/jitlink_" << sys::Process::getProcessId() << '_'
+                           << (++SharedMemoryCount);
+    SharedMemoryName = SharedMemoryNameStream.str();
+  }
+
+  int SharedMemoryFile =
+      shm_open(SharedMemoryName.c_str(), O_RDWR | O_CREAT | O_EXCL, 0700);
+  if (SharedMemoryFile < 0)
+    return errorCodeToError(std::error_code(errno, std::generic_category()));
+
+  // by default size is 0
+  if (ftruncate(SharedMemoryFile, Size) < 0)
+    return errorCodeToError(std::error_code(errno, std::generic_category()));
+
+  void *Addr = mmap(nullptr, Size, PROT_NONE, MAP_SHARED, SharedMemoryFile, 0);
+  if (Addr == MAP_FAILED)
+    return errorCodeToError(std::error_code(errno, std::generic_category()));
+
+  close(SharedMemoryFile);
+
+#elif defined(_WIN32)
+
+  std::string SharedMemoryName;
+  {
+    std::stringstream SharedMemoryNameStream;
+    SharedMemoryNameStream << "jitlink_" << sys::Process::getProcessId() << '_'
+                           << (++SharedMemoryCount);
+    SharedMemoryName = SharedMemoryNameStream.str();
+  }
+
+  std::wstring WideSharedMemoryName(SharedMemoryName.begin(),
+                                    SharedMemoryName.end());
+  HANDLE SharedMemoryFile = CreateFileMappingW(
+      INVALID_HANDLE_VALUE, NULL, PAGE_EXECUTE_READWRITE, Size >> 32,
+      Size & 0xffffffff, WideSharedMemoryName.c_str());
+  if (!SharedMemoryFile)
+    return errorCodeToError(mapWindowsError(GetLastError()));
+
+  void *Addr = MapViewOfFile(SharedMemoryFile,
+                             FILE_MAP_ALL_ACCESS | FILE_MAP_EXECUTE, 0, 0, 0);
+  if (!Addr) {
+    CloseHandle(SharedMemoryFile);
+    return errorCodeToError(mapWindowsError(GetLastError()));
+  }
+
+#endif
+
+  {
+    std::lock_guard<std::mutex> Lock(Mutex);
+    Reservations[Addr].Size = Size;
+#if defined(_WIN32)
+    Reservations[Addr].SharedMemoryFile = SharedMemoryFile;
+#endif
+  }
+
+  return std::make_pair(ExecutorAddr::fromPtr(Addr),
+                        std::move(SharedMemoryName));
+#else
+  return make_error<StringError>(
+      "SharedMemoryMapper is not supported on this platform yet",
+      inconvertibleErrorCode());
+#endif
+}
+
+Expected<ExecutorAddr> ExecutorSharedMemoryMapperService::initialize(
+    ExecutorAddr Reservation, tpctypes::SharedMemoryFinalizeRequest &FR) {
+#if defined(LLVM_ON_UNIX) || defined(_WIN32)
+
+  ExecutorAddr MinAddr(~0ULL);
+
+  // Contents are already in place
+  for (auto &Segment : FR.Segments) {
+    if (Segment.Addr < MinAddr)
+      MinAddr = Segment.Addr;
+
+#if defined(LLVM_ON_UNIX)
+
+    int NativeProt = 0;
+    if (Segment.Prot & tpctypes::WPF_Read)
+      NativeProt |= PROT_READ;
+    if (Segment.Prot & tpctypes::WPF_Write)
+      NativeProt |= PROT_WRITE;
+    if (Segment.Prot & tpctypes::WPF_Exec)
+      NativeProt |= PROT_EXEC;
+
+    if (mprotect(Segment.Addr.toPtr<void *>(), Segment.Size, NativeProt))
+      return errorCodeToError(std::error_code(errno, std::generic_category()));
+
+#elif defined(_WIN32)
+
+    DWORD NativeProt =
+        getWindowsProtectionFlags(fromWireProtectionFlags(Segment.Prot));
+
+    if (!VirtualProtect(Segment.Addr.toPtr<void *>(), Segment.Size, NativeProt,
+                        &NativeProt))
+      return errorCodeToError(mapWindowsError(GetLastError()));
+
+#endif
+
+    if (Segment.Prot & tpctypes::WPF_Exec)
+      sys::Memory::InvalidateInstructionCache(Segment.Addr.toPtr<void *>(),
+                                              Segment.Size);
+  }
+
+  // Run finalization actions and get deinitlization action list.
+  auto DeinitializeActions = shared::runFinalizeActions(FR.Actions);
+  if (!DeinitializeActions) {
+    return DeinitializeActions.takeError();
+  }
+
+  {
+    std::lock_guard<std::mutex> Lock(Mutex);
+    Allocations[MinAddr].DeinitializationActions =
+        std::move(*DeinitializeActions);
+    Reservations[Reservation.toPtr<void *>()].Allocations.push_back(MinAddr);
+  }
+
+  return MinAddr;
+
+#else
+  return make_error<StringError>(
+      "SharedMemoryMapper is not supported on this platform yet",
+      inconvertibleErrorCode());
+#endif
+}
+
+Error ExecutorSharedMemoryMapperService::deinitialize(
+    const std::vector<ExecutorAddr> &Bases) {
+  Error AllErr = Error::success();
+
+  {
+    std::lock_guard<std::mutex> Lock(Mutex);
+
+    for (auto Base : Bases) {
+      if (Error Err = shared::runDeallocActions(
+              Allocations[Base].DeinitializationActions)) {
+        AllErr = joinErrors(std::move(AllErr), std::move(Err));
+      }
+
+      Allocations.erase(Base);
+    }
+  }
+
+  return AllErr;
+}
+
+Error ExecutorSharedMemoryMapperService::release(
+    const std::vector<ExecutorAddr> &Bases) {
+#if defined(LLVM_ON_UNIX) || defined(_WIN32)
+  Error Err = Error::success();
+
+  for (auto Base : Bases) {
+    std::vector<ExecutorAddr> AllocAddrs;
+    size_t Size;
+
+#if defined(_WIN32)
+    HANDLE SharedMemoryFile;
+#endif
+
+    {
+      std::lock_guard<std::mutex> Lock(Mutex);
+      auto &R = Reservations[Base.toPtr<void *>()];
+      Size = R.Size;
+
+#if defined(_WIN32)
+      SharedMemoryFile = R.SharedMemoryFile;
+#endif
+
+      AllocAddrs.swap(R.Allocations);
+    }
+
+    // deinitialize sub allocations
+    if (Error E = deinitialize(AllocAddrs))
+      Err = joinErrors(std::move(Err), std::move(E));
+
+#if defined(LLVM_ON_UNIX)
+
+    if (munmap(Base.toPtr<void *>(), Size) != 0)
+      Err = joinErrors(std::move(Err), errorCodeToError(std::error_code(
+                                           errno, std::generic_category())));
+
+#elif defined(_WIN32)
+
+    if (!UnmapViewOfFile(Base.toPtr<void *>()))
+      Err = joinErrors(std::move(Err),
+                       errorCodeToError(mapWindowsError(GetLastError())));
+
+    CloseHandle(SharedMemoryFile);
+
+#endif
+
+    std::lock_guard<std::mutex> Lock(Mutex);
+    Reservations.erase(Base.toPtr<void *>());
+  }
+
+  return Err;
+#else
+  return make_error<StringError>(
+      "SharedMemoryMapper is not supported on this platform yet",
+      inconvertibleErrorCode());
+#endif
+}
+
+Error ExecutorSharedMemoryMapperService::shutdown() {
+  std::vector<ExecutorAddr> ReservationAddrs;
+  if (!Reservations.empty()) {
+    std::lock_guard<std::mutex> Lock(Mutex);
+    {
+      ReservationAddrs.reserve(Reservations.size());
+      for (const auto &R : Reservations) {
+        ReservationAddrs.push_back(ExecutorAddr::fromPtr(R.getFirst()));
+      }
+    }
+  }
+  return release(ReservationAddrs);
+
+  return Error::success();
+}
+
+void ExecutorSharedMemoryMapperService::addBootstrapSymbols(
+    StringMap<ExecutorAddr> &M) {
+  M[rt::ExecutorSharedMemoryMapperServiceInstanceName] =
+      ExecutorAddr::fromPtr(this);
+  M[rt::ExecutorSharedMemoryMapperServiceReserveWrapperName] =
+      ExecutorAddr::fromPtr(&reserveWrapper);
+  M[rt::ExecutorSharedMemoryMapperServiceInitializeWrapperName] =
+      ExecutorAddr::fromPtr(&initializeWrapper);
+  M[rt::ExecutorSharedMemoryMapperServiceDeinitializeWrapperName] =
+      ExecutorAddr::fromPtr(&deinitializeWrapper);
+  M[rt::ExecutorSharedMemoryMapperServiceReleaseWrapperName] =
+      ExecutorAddr::fromPtr(&releaseWrapper);
+}
+
+llvm::orc::shared::CWrapperFunctionResult
+ExecutorSharedMemoryMapperService::reserveWrapper(const char *ArgData,
+                                                  size_t ArgSize) {
+  return shared::WrapperFunction<
+             rt::SPSExecutorSharedMemoryMapperServiceReserveSignature>::
+      handle(ArgData, ArgSize,
+             shared::makeMethodWrapperHandler(
+                 &ExecutorSharedMemoryMapperService::reserve))
+          .release();
+}
+
+llvm::orc::shared::CWrapperFunctionResult
+ExecutorSharedMemoryMapperService::initializeWrapper(const char *ArgData,
+                                                     size_t ArgSize) {
+  return shared::WrapperFunction<
+             rt::SPSExecutorSharedMemoryMapperServiceInitializeSignature>::
+      handle(ArgData, ArgSize,
+             shared::makeMethodWrapperHandler(
+                 &ExecutorSharedMemoryMapperService::initialize))
+          .release();
+}
+
+llvm::orc::shared::CWrapperFunctionResult
+ExecutorSharedMemoryMapperService::deinitializeWrapper(const char *ArgData,
+                                                       size_t ArgSize) {
+  return shared::WrapperFunction<
+             rt::SPSExecutorSharedMemoryMapperServiceDeinitializeSignature>::
+      handle(ArgData, ArgSize,
+             shared::makeMethodWrapperHandler(
+                 &ExecutorSharedMemoryMapperService::deinitialize))
+          .release();
+}
+
+llvm::orc::shared::CWrapperFunctionResult
+ExecutorSharedMemoryMapperService::releaseWrapper(const char *ArgData,
+                                                  size_t ArgSize) {
+  return shared::WrapperFunction<
+             rt::SPSExecutorSharedMemoryMapperServiceReleaseSignature>::
+      handle(ArgData, ArgSize,
+             shared::makeMethodWrapperHandler(
+                 &ExecutorSharedMemoryMapperService::release))
+          .release();
+}
+
+} // namespace rt_bootstrap
+} // end namespace orc
+} // end namespace llvm
diff --git a/llvm/unittests/ExecutionEngine/Orc/CMakeLists.txt b/llvm/unittests/ExecutionEngine/Orc/CMakeLists.txt
--- a/llvm/unittests/ExecutionEngine/Orc/CMakeLists.txt
+++ b/llvm/unittests/ExecutionEngine/Orc/CMakeLists.txt
@@ -30,6 +30,7 @@
   OrcTestCommon.cpp
   ResourceTrackerTest.cpp
   RTDyldObjectLinkingLayerTest.cpp
+  SharedMemoryMapperTest.cpp
   SimpleExecutorMemoryManagerTest.cpp
   SimplePackedSerializationTest.cpp
   SymbolStringPoolTest.cpp
diff --git a/llvm/unittests/ExecutionEngine/Orc/SharedMemoryMapperTest.cpp b/llvm/unittests/ExecutionEngine/Orc/SharedMemoryMapperTest.cpp
new file mode 100644
--- /dev/null
+++ b/llvm/unittests/ExecutionEngine/Orc/SharedMemoryMapperTest.cpp
@@ -0,0 +1,133 @@
+//===- SharedMemoryMapperTest.cpp -- Tests for SharedMemoryMapper ---------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "OrcTestCommon.h"
+
+#include "llvm/ExecutionEngine/Orc/MemoryMapper.h"
+#include "llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h"
+#include "llvm/ExecutionEngine/Orc/TargetProcess/ExecutorSharedMemoryMapperService.h"
+#include "llvm/Testing/Support/Error.h"
+
+using namespace llvm;
+using namespace llvm::orc;
+using namespace llvm::orc::shared;
+using namespace llvm::orc::rt_bootstrap;
+
+#if defined(LLVM_ON_UNIX) || defined(_WIN32)
+
+// A basic function to be used as both initializer/deinitializer
+orc::shared::CWrapperFunctionResult incrementWrapper(const char *ArgData,
+                                                     size_t ArgSize) {
+  return WrapperFunction<SPSError(SPSExecutorAddr)>::handle(
+             ArgData, ArgSize,
+             [](ExecutorAddr A) -> Error {
+               *A.toPtr<int *>() += 1;
+               return Error::success();
+             })
+      .release();
+}
+
+TEST(SharedMemoryMapperTest, MemReserveInitializeDeinitializeRelease) {
+  // These counters are used to track how many times the initializer and
+  // deinitializer functions are called
+  int InitializeCounter = 0;
+  int DeinitializeCounter = 0;
+
+  auto SelfEPC = cantFail(SelfExecutorProcessControl::Create());
+
+  ExecutorSharedMemoryMapperService MapperService;
+
+  SharedMemoryMapper::SymbolAddrs SAs;
+  {
+    StringMap<ExecutorAddr> Map;
+    MapperService.addBootstrapSymbols(Map);
+    SAs.Instance = Map[rt::ExecutorSharedMemoryMapperServiceInstanceName];
+    SAs.Reserve = Map[rt::ExecutorSharedMemoryMapperServiceReserveWrapperName];
+    SAs.Initialize =
+        Map[rt::ExecutorSharedMemoryMapperServiceInitializeWrapperName];
+    SAs.Deinitialize =
+        Map[rt::ExecutorSharedMemoryMapperServiceDeinitializeWrapperName];
+    SAs.Release = Map[rt::ExecutorSharedMemoryMapperServiceReleaseWrapperName];
+  }
+
+  std::string TestString = "Hello, World!";
+
+  // barrier
+  std::promise<void> P;
+  auto F = P.get_future();
+
+  {
+    auto PageSize = cantFail(sys::Process::getPageSize());
+    size_t ReqSize = PageSize;
+
+    std::unique_ptr<MemoryMapper> Mapper =
+        std::make_unique<SharedMemoryMapper>(*SelfEPC, SAs);
+
+    Mapper->reserve(ReqSize, [&](Expected<ExecutorAddrRange> Result) {
+      EXPECT_THAT_ERROR(Result.takeError(), Succeeded());
+      auto Reservation = std::move(*Result);
+      {
+        char *Addr = Mapper->prepare(Reservation.Start, TestString.size() + 1);
+        std::strcpy(Addr, TestString.c_str());
+      }
+      MemoryMapper::AllocInfo AI;
+      {
+        MemoryMapper::AllocInfo::SegInfo SI;
+        SI.Offset = 0;
+        SI.ContentSize = TestString.size() + 1;
+        SI.ZeroFillSize = PageSize - SI.ContentSize;
+        SI.Prot = sys::Memory::MF_READ | sys::Memory::MF_WRITE;
+
+        AI.MappingBase = Reservation.Start;
+        AI.Segments.push_back(SI);
+        AI.Actions.push_back(
+            {cantFail(WrapperFunctionCall::Create<SPSArgList<SPSExecutorAddr>>(
+                 ExecutorAddr::fromPtr(incrementWrapper),
+                 ExecutorAddr::fromPtr(&InitializeCounter))),
+             cantFail(WrapperFunctionCall::Create<SPSArgList<SPSExecutorAddr>>(
+                 ExecutorAddr::fromPtr(incrementWrapper),
+                 ExecutorAddr::fromPtr(&DeinitializeCounter)))});
+      }
+
+      EXPECT_EQ(InitializeCounter, 0);
+      EXPECT_EQ(DeinitializeCounter, 0);
+
+      Mapper->initialize(AI, [&, Reservation](Expected<ExecutorAddr> Result) {
+        EXPECT_THAT_ERROR(Result.takeError(), Succeeded());
+
+        EXPECT_EQ(TestString, std::string(static_cast<char *>(
+                                  Reservation.Start.toPtr<char *>())));
+
+        EXPECT_EQ(InitializeCounter, 1);
+        EXPECT_EQ(DeinitializeCounter, 0);
+
+        Mapper->deinitialize({*Result}, [&, Reservation](Error Err) {
+          EXPECT_THAT_ERROR(std::move(Err), Succeeded());
+
+          EXPECT_EQ(InitializeCounter, 1);
+          EXPECT_EQ(DeinitializeCounter, 1);
+
+          Mapper->release({Reservation.Start}, [&](Error Err) {
+            EXPECT_THAT_ERROR(std::move(Err), Succeeded());
+
+            P.set_value();
+          });
+        });
+      });
+    });
+
+    // This will block the test if any of the above callbacks are not executed
+    F.wait();
+    // Mapper must be destructed before calling shutdown to avoid double free
+  }
+
+  EXPECT_THAT_ERROR(MapperService.shutdown(), Succeeded());
+  cantFail(SelfEPC->disconnect());
+}
+
+#endif