vendor/llvm/llvm-trunk-r366426

11 files changed, 1347 insertions, 8 deletions

diff --git a/lib/TextAPI/ELF/ELFStub.cpp b/lib/TextAPI/ELF/ELFStub.cpp
index 248a078a2404..f8463497093b 100644
--- a/lib/TextAPI/ELF/ELFStub.cpp
+++ b/lib/TextAPI/ELF/ELFStub.cpp
@@ -1,9 +1,8 @@
 //===- ELFStub.cpp --------------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// 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
 //
 //===-----------------------------------------------------------------------===/
 
diff --git a/lib/TextAPI/ELF/TBEHandler.cpp b/lib/TextAPI/ELF/TBEHandler.cpp
index b621829d9358..cb597d8896e8 100644
--- a/lib/TextAPI/ELF/TBEHandler.cpp
+++ b/lib/TextAPI/ELF/TBEHandler.cpp
@@ -1,9 +1,8 @@
 //===- TBEHandler.cpp -----------------------------------------------------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// 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
 //
 //===-----------------------------------------------------------------------===/
 
diff --git a/lib/TextAPI/MachO/Architecture.cpp b/lib/TextAPI/MachO/Architecture.cpp
new file mode 100644
index 000000000000..a66a982fa153
--- /dev/null
+++ b/lib/TextAPI/MachO/Architecture.cpp
@@ -0,0 +1,77 @@
+//===- Architecture.cpp ---------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the architecture helper functions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/TextAPI/MachO/Architecture.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/BinaryFormat/MachO.h"
+
+namespace llvm {
+namespace MachO {
+
+Architecture getArchitectureFromCpuType(uint32_t CPUType, uint32_t CPUSubType) {
+#define ARCHINFO(Arch, Type, Subtype)                                          \
+  if (CPUType == (Type) &&                                                     \
+      (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) == (Subtype))                    \
+    return AK_##Arch;
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+
+  return AK_unknown;
+}
+
+Architecture getArchitectureFromName(StringRef Name) {
+  return StringSwitch<Architecture>(Name)
+#define ARCHINFO(Arch, Type, Subtype) .Case(#Arch, AK_##Arch)
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+      .Default(AK_unknown);
+}
+
+StringRef getArchitectureName(Architecture Arch) {
+  switch (Arch) {
+#define ARCHINFO(Arch, Type, Subtype)                                          \
+  case AK_##Arch:                                                              \
+    return #Arch;
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+  case AK_unknown:
+    return "unknown";
+  }
+
+  // Appease some compilers that cannot figure out that this is a fully covered
+  // switch statement.
+  return "unknown";
+}
+
+std::pair<uint32_t, uint32_t> getCPUTypeFromArchitecture(Architecture Arch) {
+  switch (Arch) {
+#define ARCHINFO(Arch, Type, Subtype)                                          \
+  case AK_##Arch:                                                              \
+    return std::make_pair(Type, Subtype);
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+  case AK_unknown:
+    return std::make_pair(0, 0);
+  }
+
+  // Appease some compilers that cannot figure out that this is a fully covered
+  // switch statement.
+  return std::make_pair(0, 0);
+}
+
+raw_ostream &operator<<(raw_ostream &OS, Architecture Arch) {
+  OS << getArchitectureName(Arch);
+  return OS;
+}
+
+} // end namespace MachO.
+} // end namespace llvm.
diff --git a/lib/TextAPI/MachO/ArchitectureSet.cpp b/lib/TextAPI/MachO/ArchitectureSet.cpp
new file mode 100644
index 000000000000..c589671199b7
--- /dev/null
+++ b/lib/TextAPI/MachO/ArchitectureSet.cpp
@@ -0,0 +1,69 @@
+//===- ArchitectureSet.cpp ------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the architecture set.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/TextAPI/MachO/ArchitectureSet.h"
+
+namespace llvm {
+namespace MachO {
+
+ArchitectureSet::ArchitectureSet(const std::vector<Architecture> &Archs)
+    : ArchitectureSet() {
+  for (auto Arch : Archs) {
+    if (Arch == AK_unknown)
+      continue;
+    set(Arch);
+  }
+}
+
+size_t ArchitectureSet::count() const {
+  // popcnt
+  size_t Cnt = 0;
+  for (unsigned i = 0; i < sizeof(ArchSetType) * 8; ++i)
+    if (ArchSet & (1U << i))
+      ++Cnt;
+  return Cnt;
+}
+
+ArchitectureSet::operator std::string() const {
+  if (empty())
+    return "[(empty)]";
+
+  std::string result;
+  auto size = count();
+  for (auto arch : *this) {
+    result.append(getArchitectureName(arch));
+    size -= 1;
+    if (size)
+      result.append(" ");
+  }
+  return result;
+}
+
+ArchitectureSet::operator std::vector<Architecture>() const {
+  std::vector<Architecture> archs;
+  for (auto arch : *this) {
+    if (arch == AK_unknown)
+      continue;
+    archs.emplace_back(arch);
+  }
+  return archs;
+}
+
+void ArchitectureSet::print(raw_ostream &os) const { os << std::string(*this); }
+
+raw_ostream &operator<<(raw_ostream &os, ArchitectureSet set) {
+  set.print(os);
+  return os;
+}
+
+} // end namespace MachO.
+} // end namespace llvm.
diff --git a/lib/TextAPI/MachO/InterfaceFile.cpp b/lib/TextAPI/MachO/InterfaceFile.cpp
new file mode 100644
index 000000000000..54ba8cc31267
--- /dev/null
+++ b/lib/TextAPI/MachO/InterfaceFile.cpp
@@ -0,0 +1,81 @@
+//===- InterfaceFile.cpp --------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the Interface File.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/TextAPI/MachO/InterfaceFile.h"
+#include <iomanip>
+#include <sstream>
+
+namespace llvm {
+namespace MachO {
+namespace detail {
+template <typename C>
+typename C::iterator addEntry(C &Container, StringRef InstallName) {
+  auto I = partition_point(Container, [=](const InterfaceFileRef &O) {
+    return O.getInstallName() < InstallName;
+  });
+  if (I != Container.end() && I->getInstallName() == InstallName)
+    return I;
+
+  return Container.emplace(I, InstallName);
+}
+} // end namespace detail.
+
+void InterfaceFile::addAllowableClient(StringRef Name,
+                                       ArchitectureSet Architectures) {
+  auto Client = detail::addEntry(AllowableClients, Name);
+  Client->addArchitectures(Architectures);
+}
+
+void InterfaceFile::addReexportedLibrary(StringRef InstallName,
+                                         ArchitectureSet Architectures) {
+  auto Lib = detail::addEntry(ReexportedLibraries, InstallName);
+  Lib->addArchitectures(Architectures);
+}
+
+void InterfaceFile::addUUID(Architecture Arch, StringRef UUID) {
+  auto I = partition_point(UUIDs,
+                           [=](const std::pair<Architecture, std::string> &O) {
+                             return O.first < Arch;
+                           });
+
+  if (I != UUIDs.end() && Arch == I->first) {
+    I->second = UUID;
+    return;
+  }
+
+  UUIDs.emplace(I, Arch, UUID);
+  return;
+}
+
+void InterfaceFile::addUUID(Architecture Arch, uint8_t UUID[16]) {
+  std::stringstream Stream;
+  for (unsigned i = 0; i < 16; ++i) {
+    if (i == 4 || i == 6 || i == 8 || i == 10)
+      Stream << '-';
+    Stream << std::setfill('0') << std::setw(2) << std::uppercase << std::hex
+           << static_cast<int>(UUID[i]);
+  }
+  addUUID(Arch, Stream.str());
+}
+
+void InterfaceFile::addSymbol(SymbolKind Kind, StringRef Name,
+                              ArchitectureSet Archs, SymbolFlags Flags) {
+  Name = copyString(Name);
+  auto result = Symbols.try_emplace(SymbolsMapKey{Kind, Name}, nullptr);
+  if (result.second)
+    result.first->second = new (Allocator) Symbol{Kind, Name, Archs, Flags};
+  else
+    result.first->second->addArchitectures(Archs);
+}
+
+} // end namespace MachO.
+} // end namespace llvm.
diff --git a/lib/TextAPI/MachO/PackedVersion.cpp b/lib/TextAPI/MachO/PackedVersion.cpp
new file mode 100644
index 000000000000..8405aba90ed6
--- /dev/null
+++ b/lib/TextAPI/MachO/PackedVersion.cpp
@@ -0,0 +1,113 @@
+//===- PackedVersion.cpp --------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the Mach-O packed version.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/TextAPI/MachO/PackedVersion.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+namespace MachO {
+
+bool PackedVersion::parse32(StringRef Str) {
+  Version = 0;
+
+  if (Str.empty())
+    return false;
+
+  SmallVector<StringRef, 3> Parts;
+  SplitString(Str, Parts, ".");
+
+  if (Parts.size() > 3)
+    return false;
+
+  unsigned long long Num;
+  if (getAsUnsignedInteger(Parts[0], 10, Num))
+    return false;
+
+  if (Num > UINT16_MAX)
+    return false;
+
+  Version = Num << 16;
+
+  for (unsigned i = 1, ShiftNum = 8; i < Parts.size(); ++i, ShiftNum -= 8) {
+    if (getAsUnsignedInteger(Parts[i], 10, Num))
+      return false;
+
+    if (Num > UINT8_MAX)
+      return false;
+
+    Version |= (Num << ShiftNum);
+  }
+
+  return true;
+}
+
+std::pair<bool, bool> PackedVersion::parse64(StringRef Str) {
+  bool Truncated = false;
+  Version = 0;
+
+  if (Str.empty())
+    return std::make_pair(false, Truncated);
+
+  SmallVector<StringRef, 5> Parts;
+  SplitString(Str, Parts, ".");
+
+  if (Parts.size() > 5)
+    return std::make_pair(false, Truncated);
+
+  unsigned long long Num;
+  if (getAsUnsignedInteger(Parts[0], 10, Num))
+    return std::make_pair(false, Truncated);
+
+  if (Num > 0xFFFFFFULL)
+    return std::make_pair(false, Truncated);
+
+  if (Num > 0xFFFFULL) {
+    Num = 0xFFFFULL;
+    Truncated = true;
+  }
+  Version = Num << 16;
+
+  for (unsigned i = 1, ShiftNum = 8; i < Parts.size() && i < 3;
+       ++i, ShiftNum -= 8) {
+    if (getAsUnsignedInteger(Parts[i], 10, Num))
+      return std::make_pair(false, Truncated);
+
+    if (Num > 0x3FFULL)
+      return std::make_pair(false, Truncated);
+
+    if (Num > 0xFFULL) {
+      Num = 0xFFULL;
+      Truncated = true;
+    }
+    Version |= (Num << ShiftNum);
+  }
+
+  if (Parts.size() > 3)
+    Truncated = true;
+
+  return std::make_pair(true, Truncated);
+}
+
+void PackedVersion::print(raw_ostream &OS) const {
+  OS << format("%d", getMajor());
+  if (getMinor() || getSubminor())
+    OS << format(".%d", getMinor());
+  if (getSubminor())
+    OS << format(".%d", getSubminor());
+}
+
+} // end namespace MachO.
+} // end namespace llvm.
diff --git a/lib/TextAPI/MachO/Symbol.cpp b/lib/TextAPI/MachO/Symbol.cpp
new file mode 100644
index 000000000000..731b264f6082
--- /dev/null
+++ b/lib/TextAPI/MachO/Symbol.cpp
@@ -0,0 +1,49 @@
+//===- Symbol.cpp ---------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the Symbol.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/TextAPI/MachO/Symbol.h"
+#include <string>
+
+namespace llvm {
+namespace MachO {
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+LLVM_DUMP_METHOD void Symbol::dump(raw_ostream &OS) const {
+  std::string Result;
+  if (isUndefined())
+    Result += "(undef) ";
+  if (isWeakDefined())
+    Result += "(weak-def) ";
+  if (isWeakReferenced())
+    Result += "(weak-ref) ";
+  if (isThreadLocalValue())
+    Result += "(tlv) ";
+  switch (Kind) {
+  case SymbolKind::GlobalSymbol:
+    Result += Name.str();
+    break;
+  case SymbolKind::ObjectiveCClass:
+    Result += "(ObjC Class) " + Name.str();
+    break;
+  case SymbolKind::ObjectiveCClassEHType:
+    Result += "(ObjC Class EH) " + Name.str();
+    break;
+  case SymbolKind::ObjectiveCInstanceVariable:
+    Result += "(ObjC IVar) " + Name.str();
+    break;
+  }
+  OS << Result;
+}
+#endif
+
+} // end namespace MachO.
+} // end namespace llvm.
diff --git a/lib/TextAPI/MachO/TextAPIContext.h b/lib/TextAPI/MachO/TextAPIContext.h
new file mode 100644
index 000000000000..3df40f09f7f7
--- /dev/null
+++ b/lib/TextAPI/MachO/TextAPIContext.h
@@ -0,0 +1,33 @@
+//===- TextAPIContext.h ---------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines the YAML Context for the TextAPI Reader/Writer.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TEXTAPI_MACHO_CONTEXT_H
+#define LLVM_TEXTAPI_MACHO_CONTEXT_H
+
+#include "llvm/Support/MemoryBuffer.h"
+#include <string>
+
+namespace llvm {
+namespace MachO {
+
+enum FileType : unsigned;
+
+struct TextAPIContext {
+  std::string ErrorMessage;
+  std::string Path;
+  FileType FileKind;
+};
+
+} // end namespace MachO.
+} // end namespace llvm.
+
+#endif // LLVM_TEXTAPI_MACHO_CONTEXT_H
diff --git a/lib/TextAPI/MachO/TextStub.cpp b/lib/TextAPI/MachO/TextStub.cpp
new file mode 100644
index 000000000000..799ebdc883ab
--- /dev/null
+++ b/lib/TextAPI/MachO/TextStub.cpp
@@ -0,0 +1,660 @@
+//===- TextStub.cpp -------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implements the text stub file reader/writer.
+//
+//===----------------------------------------------------------------------===//
+
+#include "TextAPIContext.h"
+#include "TextStubCommon.h"
+#include "llvm/ADT/BitmaskEnum.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/YAMLTraits.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/TextAPI/MachO/Architecture.h"
+#include "llvm/TextAPI/MachO/ArchitectureSet.h"
+#include "llvm/TextAPI/MachO/InterfaceFile.h"
+#include "llvm/TextAPI/MachO/PackedVersion.h"
+#include "llvm/TextAPI/MachO/TextAPIReader.h"
+#include "llvm/TextAPI/MachO/TextAPIWriter.h"
+#include <algorithm>
+#include <set>
+
+// clang-format off
+/*
+
+ YAML Format specification.
+
+ The TBD v1 format only support two level address libraries and is per
+ definition application extension safe.
+
+---                              # the tag !tapi-tbd-v1 is optional and
+                                 # shouldn't be emitted to support older linker.
+archs: [ armv7, armv7s, arm64 ]  # the list of architecture slices that are
+                                 # supported by this file.
+platform: ios                    # Specifies the platform (macosx, ios, etc)
+install-name: /u/l/libfoo.dylib  #
+current-version: 1.2.3           # Optional: defaults to 1.0
+compatibility-version: 1.0       # Optional: defaults to 1.0
+swift-version: 0                 # Optional: defaults to 0
+objc-constraint: none            # Optional: defaults to none
+exports:                         # List of export sections
+...
+
+Each export section is defined as following:
+
+ - archs: [ arm64 ]                   # the list of architecture slices
+   allowed-clients: [ client ]        # Optional: List of clients
+   re-exports: [ ]                    # Optional: List of re-exports
+   symbols: [ _sym ]                  # Optional: List of symbols
+   objc-classes: []                   # Optional: List of Objective-C classes
+   objc-ivars: []                     # Optional: List of Objective C Instance
+                                      #           Variables
+   weak-def-symbols: []               # Optional: List of weak defined symbols
+   thread-local-symbols: []           # Optional: List of thread local symbols
+*/
+
+/*
+
+ YAML Format specification.
+
+--- !tapi-tbd-v2
+archs: [ armv7, armv7s, arm64 ]  # the list of architecture slices that are
+                                 # supported by this file.
+uuids: [ armv7:... ]             # Optional: List of architecture and UUID pairs.
+platform: ios                    # Specifies the platform (macosx, ios, etc)
+flags: []                        # Optional:
+install-name: /u/l/libfoo.dylib  #
+current-version: 1.2.3           # Optional: defaults to 1.0
+compatibility-version: 1.0       # Optional: defaults to 1.0
+swift-version: 0                 # Optional: defaults to 0
+objc-constraint: retain_release  # Optional: defaults to retain_release
+parent-umbrella:                 # Optional:
+exports:                         # List of export sections
+...
+undefineds:                      # List of undefineds sections
+...
+
+Each export section is defined as following:
+
+- archs: [ arm64 ]                   # the list of architecture slices
+  allowed-clients: [ client ]        # Optional: List of clients
+  re-exports: [ ]                    # Optional: List of re-exports
+  symbols: [ _sym ]                  # Optional: List of symbols
+  objc-classes: []                   # Optional: List of Objective-C classes
+  objc-ivars: []                     # Optional: List of Objective C Instance
+                                     #           Variables
+  weak-def-symbols: []               # Optional: List of weak defined symbols
+  thread-local-symbols: []           # Optional: List of thread local symbols
+
+Each undefineds section is defined as following:
+- archs: [ arm64 ]     # the list of architecture slices
+  symbols: [ _sym ]    # Optional: List of symbols
+  objc-classes: []     # Optional: List of Objective-C classes
+  objc-ivars: []       # Optional: List of Objective C Instance Variables
+  weak-ref-symbols: [] # Optional: List of weak defined symbols
+*/
+
+/*
+
+ YAML Format specification.
+
+--- !tapi-tbd-v3
+archs: [ armv7, armv7s, arm64 ]  # the list of architecture slices that are
+                                 # supported by this file.
+uuids: [ armv7:... ]             # Optional: List of architecture and UUID pairs.
+platform: ios                    # Specifies the platform (macosx, ios, etc)
+flags: []                        # Optional:
+install-name: /u/l/libfoo.dylib  #
+current-version: 1.2.3           # Optional: defaults to 1.0
+compatibility-version: 1.0       # Optional: defaults to 1.0
+swift-abi-version: 0             # Optional: defaults to 0
+objc-constraint: retain_release  # Optional: defaults to retain_release
+parent-umbrella:                 # Optional:
+exports:                         # List of export sections
+...
+undefineds:                      # List of undefineds sections
+...
+
+Each export section is defined as following:
+
+- archs: [ arm64 ]                   # the list of architecture slices
+  allowed-clients: [ client ]        # Optional: List of clients
+  re-exports: [ ]                    # Optional: List of re-exports
+  symbols: [ _sym ]                  # Optional: List of symbols
+  objc-classes: []                   # Optional: List of Objective-C classes
+  objc-eh-types: []                  # Optional: List of Objective-C classes
+                                     #           with EH
+  objc-ivars: []                     # Optional: List of Objective C Instance
+                                     #           Variables
+  weak-def-symbols: []               # Optional: List of weak defined symbols
+  thread-local-symbols: []           # Optional: List of thread local symbols
+
+Each undefineds section is defined as following:
+- archs: [ arm64 ]     # the list of architecture slices
+  symbols: [ _sym ]    # Optional: List of symbols
+  objc-classes: []     # Optional: List of Objective-C classes
+  objc-eh-types: []                  # Optional: List of Objective-C classes
+                                     #           with EH
+  objc-ivars: []       # Optional: List of Objective C Instance Variables
+  weak-ref-symbols: [] # Optional: List of weak defined symbols
+*/
+// clang-format on
+
+using namespace llvm;
+using namespace llvm::yaml;
+using namespace llvm::MachO;
+
+namespace {
+struct ExportSection {
+  std::vector<Architecture> Architectures;
+  std::vector<FlowStringRef> AllowableClients;
+  std::vector<FlowStringRef> ReexportedLibraries;
+  std::vector<FlowStringRef> Symbols;
+  std::vector<FlowStringRef> Classes;
+  std::vector<FlowStringRef> ClassEHs;
+  std::vector<FlowStringRef> IVars;
+  std::vector<FlowStringRef> WeakDefSymbols;
+  std::vector<FlowStringRef> TLVSymbols;
+};
+
+struct UndefinedSection {
+  std::vector<Architecture> Architectures;
+  std::vector<FlowStringRef> Symbols;
+  std::vector<FlowStringRef> Classes;
+  std::vector<FlowStringRef> ClassEHs;
+  std::vector<FlowStringRef> IVars;
+  std::vector<FlowStringRef> WeakRefSymbols;
+};
+
+// clang-format off
+enum TBDFlags : unsigned {
+  None                         = 0U,
+  FlatNamespace                = 1U << 0,
+  NotApplicationExtensionSafe  = 1U << 1,
+  InstallAPI                   = 1U << 2,
+  LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/InstallAPI),
+};
+// clang-format on
+} // end anonymous namespace.
+
+LLVM_YAML_IS_FLOW_SEQUENCE_VECTOR(Architecture)
+LLVM_YAML_IS_SEQUENCE_VECTOR(ExportSection)
+LLVM_YAML_IS_SEQUENCE_VECTOR(UndefinedSection)
+
+namespace llvm {
+namespace yaml {
+
+template <> struct MappingTraits<ExportSection> {
+  static void mapping(IO &IO, ExportSection &Section) {
+    const auto *Ctx = reinterpret_cast<TextAPIContext *>(IO.getContext());
+    assert((!Ctx || (Ctx && Ctx->FileKind != FileType::Invalid)) &&
+           "File type is not set in YAML context");
+
+    IO.mapRequired("archs", Section.Architectures);
+    if (Ctx->FileKind == FileType::TBD_V1)
+      IO.mapOptional("allowed-clients", Section.AllowableClients);
+    else
+      IO.mapOptional("allowable-clients", Section.AllowableClients);
+    IO.mapOptional("re-exports", Section.ReexportedLibraries);
+    IO.mapOptional("symbols", Section.Symbols);
+    IO.mapOptional("objc-classes", Section.Classes);
+    if (Ctx->FileKind == FileType::TBD_V3)
+      IO.mapOptional("objc-eh-types", Section.ClassEHs);
+    IO.mapOptional("objc-ivars", Section.IVars);
+    IO.mapOptional("weak-def-symbols", Section.WeakDefSymbols);
+    IO.mapOptional("thread-local-symbols", Section.TLVSymbols);
+  }
+};
+
+template <> struct MappingTraits<UndefinedSection> {
+  static void mapping(IO &IO, UndefinedSection &Section) {
+    const auto *Ctx = reinterpret_cast<TextAPIContext *>(IO.getContext());
+    assert((!Ctx || (Ctx && Ctx->FileKind != FileType::Invalid)) &&
+           "File type is not set in YAML context");
+
+    IO.mapRequired("archs", Section.Architectures);
+    IO.mapOptional("symbols", Section.Symbols);
+    IO.mapOptional("objc-classes", Section.Classes);
+    if (Ctx->FileKind == FileType::TBD_V3)
+      IO.mapOptional("objc-eh-types", Section.ClassEHs);
+    IO.mapOptional("objc-ivars", Section.IVars);
+    IO.mapOptional("weak-ref-symbols", Section.WeakRefSymbols);
+  }
+};
+
+template <> struct ScalarBitSetTraits<TBDFlags> {
+  static void bitset(IO &IO, TBDFlags &Flags) {
+    IO.bitSetCase(Flags, "flat_namespace", TBDFlags::FlatNamespace);
+    IO.bitSetCase(Flags, "not_app_extension_safe",
+                  TBDFlags::NotApplicationExtensionSafe);
+    IO.bitSetCase(Flags, "installapi", TBDFlags::InstallAPI);
+  }
+};
+
+template <> struct MappingTraits<const InterfaceFile *> {
+  struct NormalizedTBD {
+    explicit NormalizedTBD(IO &IO) {}
+    NormalizedTBD(IO &IO, const InterfaceFile *&File) {
+      Architectures = File->getArchitectures();
+      UUIDs = File->uuids();
+      Platform = File->getPlatform();
+      InstallName = File->getInstallName();
+      CurrentVersion = PackedVersion(File->getCurrentVersion());
+      CompatibilityVersion = PackedVersion(File->getCompatibilityVersion());
+      SwiftABIVersion = File->getSwiftABIVersion();
+      ObjCConstraint = File->getObjCConstraint();
+
+      Flags = TBDFlags::None;
+      if (!File->isApplicationExtensionSafe())
+        Flags |= TBDFlags::NotApplicationExtensionSafe;
+
+      if (!File->isTwoLevelNamespace())
+        Flags |= TBDFlags::FlatNamespace;
+
+      if (File->isInstallAPI())
+        Flags |= TBDFlags::InstallAPI;
+
+      ParentUmbrella = File->getParentUmbrella();
+
+      std::set<ArchitectureSet> ArchSet;
+      for (const auto &Library : File->allowableClients())
+        ArchSet.insert(Library.getArchitectures());
+
+      for (const auto &Library : File->reexportedLibraries())
+        ArchSet.insert(Library.getArchitectures());
+
+      std::map<const Symbol *, ArchitectureSet> SymbolToArchSet;
+      for (const auto *Symbol : File->exports()) {
+        auto Architectures = Symbol->getArchitectures();
+        SymbolToArchSet[Symbol] = Architectures;
+        ArchSet.insert(Architectures);
+      }
+
+      for (auto Architectures : ArchSet) {
+        ExportSection Section;
+        Section.Architectures = Architectures;
+
+        for (const auto &Library : File->allowableClients())
+          if (Library.getArchitectures() == Architectures)
+            Section.AllowableClients.emplace_back(Library.getInstallName());
+
+        for (const auto &Library : File->reexportedLibraries())
+          if (Library.getArchitectures() == Architectures)
+            Section.ReexportedLibraries.emplace_back(Library.getInstallName());
+
+        for (const auto &SymArch : SymbolToArchSet) {
+          if (SymArch.second != Architectures)
+            continue;
+
+          const auto *Symbol = SymArch.first;
+          switch (Symbol->getKind()) {
+          case SymbolKind::GlobalSymbol:
+            if (Symbol->isWeakDefined())
+              Section.WeakDefSymbols.emplace_back(Symbol->getName());
+            else if (Symbol->isThreadLocalValue())
+              Section.TLVSymbols.emplace_back(Symbol->getName());
+            else
+              Section.Symbols.emplace_back(Symbol->getName());
+            break;
+          case SymbolKind::ObjectiveCClass:
+            if (File->getFileType() != FileType::TBD_V3)
+              Section.Classes.emplace_back(
+                  copyString("_" + Symbol->getName().str()));
+            else
+              Section.Classes.emplace_back(Symbol->getName());
+            break;
+          case SymbolKind::ObjectiveCClassEHType:
+            if (File->getFileType() != FileType::TBD_V3)
+              Section.Symbols.emplace_back(
+                  copyString("_OBJC_EHTYPE_$_" + Symbol->getName().str()));
+            else
+              Section.ClassEHs.emplace_back(Symbol->getName());
+            break;
+          case SymbolKind::ObjectiveCInstanceVariable:
+            if (File->getFileType() != FileType::TBD_V3)
+              Section.IVars.emplace_back(
+                  copyString("_" + Symbol->getName().str()));
+            else
+              Section.IVars.emplace_back(Symbol->getName());
+            break;
+          }
+        }
+        llvm::sort(Section.Symbols.begin(), Section.Symbols.end());
+        llvm::sort(Section.Classes.begin(), Section.Classes.end());
+        llvm::sort(Section.ClassEHs.begin(), Section.ClassEHs.end());
+        llvm::sort(Section.IVars.begin(), Section.IVars.end());
+        llvm::sort(Section.WeakDefSymbols.begin(),
+                   Section.WeakDefSymbols.end());
+        llvm::sort(Section.TLVSymbols.begin(), Section.TLVSymbols.end());
+        Exports.emplace_back(std::move(Section));
+      }
+
+      ArchSet.clear();
+      SymbolToArchSet.clear();
+
+      for (const auto *Symbol : File->undefineds()) {
+        auto Architectures = Symbol->getArchitectures();
+        SymbolToArchSet[Symbol] = Architectures;
+        ArchSet.insert(Architectures);
+      }
+
+      for (auto Architectures : ArchSet) {
+        UndefinedSection Section;
+        Section.Architectures = Architectures;
+
+        for (const auto &SymArch : SymbolToArchSet) {
+          if (SymArch.second != Architectures)
+            continue;
+
+          const auto *Symbol = SymArch.first;
+          switch (Symbol->getKind()) {
+          case SymbolKind::GlobalSymbol:
+            if (Symbol->isWeakReferenced())
+              Section.WeakRefSymbols.emplace_back(Symbol->getName());
+            else
+              Section.Symbols.emplace_back(Symbol->getName());
+            break;
+          case SymbolKind::ObjectiveCClass:
+            if (File->getFileType() != FileType::TBD_V3)
+              Section.Classes.emplace_back(
+                  copyString("_" + Symbol->getName().str()));
+            else
+              Section.Classes.emplace_back(Symbol->getName());
+            break;
+          case SymbolKind::ObjectiveCClassEHType:
+            if (File->getFileType() != FileType::TBD_V3)
+              Section.Symbols.emplace_back(
+                  copyString("_OBJC_EHTYPE_$_" + Symbol->getName().str()));
+            else
+              Section.ClassEHs.emplace_back(Symbol->getName());
+            break;
+          case SymbolKind::ObjectiveCInstanceVariable:
+            if (File->getFileType() != FileType::TBD_V3)
+              Section.IVars.emplace_back(
+                  copyString("_" + Symbol->getName().str()));
+            else
+              Section.IVars.emplace_back(Symbol->getName());
+            break;
+          }
+        }
+        llvm::sort(Section.Symbols.begin(), Section.Symbols.end());
+        llvm::sort(Section.Classes.begin(), Section.Classes.end());
+        llvm::sort(Section.ClassEHs.begin(), Section.ClassEHs.end());
+        llvm::sort(Section.IVars.begin(), Section.IVars.end());
+        llvm::sort(Section.WeakRefSymbols.begin(),
+                   Section.WeakRefSymbols.end());
+        Undefineds.emplace_back(std::move(Section));
+      }
+    }
+
+    const InterfaceFile *denormalize(IO &IO) {
+      auto Ctx = reinterpret_cast<TextAPIContext *>(IO.getContext());
+      assert(Ctx);
+
+      auto *File = new InterfaceFile;
+      File->setPath(Ctx->Path);
+      File->setFileType(Ctx->FileKind);
+      for (auto &ID : UUIDs)
+        File->addUUID(ID.first, ID.second);
+      File->setPlatform(Platform);
+      File->setArchitectures(Architectures);
+      File->setInstallName(InstallName);
+      File->setCurrentVersion(CurrentVersion);
+      File->setCompatibilityVersion(CompatibilityVersion);
+      File->setSwiftABIVersion(SwiftABIVersion);
+      File->setObjCConstraint(ObjCConstraint);
+      File->setParentUmbrella(ParentUmbrella);
+
+      if (Ctx->FileKind == FileType::TBD_V1) {
+        File->setTwoLevelNamespace();
+        File->setApplicationExtensionSafe();
+      } else {
+        File->setTwoLevelNamespace(!(Flags & TBDFlags::FlatNamespace));
+        File->setApplicationExtensionSafe(
+            !(Flags & TBDFlags::NotApplicationExtensionSafe));
+        File->setInstallAPI(Flags & TBDFlags::InstallAPI);
+      }
+
+      for (const auto &Section : Exports) {
+        for (const auto &Library : Section.AllowableClients)
+          File->addAllowableClient(Library, Section.Architectures);
+        for (const auto &Library : Section.ReexportedLibraries)
+          File->addReexportedLibrary(Library, Section.Architectures);
+
+        for (const auto &Symbol : Section.Symbols) {
+          if (Ctx->FileKind != FileType::TBD_V3 &&
+              Symbol.value.startswith("_OBJC_EHTYPE_$_"))
+            File->addSymbol(SymbolKind::ObjectiveCClassEHType,
+                            Symbol.value.drop_front(15), Section.Architectures);
+          else
+            File->addSymbol(SymbolKind::GlobalSymbol, Symbol,
+                            Section.Architectures);
+        }
+        for (auto &Symbol : Section.Classes) {
+          auto Name = Symbol.value;
+          if (Ctx->FileKind != FileType::TBD_V3)
+            Name = Name.drop_front();
+          File->addSymbol(SymbolKind::ObjectiveCClass, Name,
+                          Section.Architectures);
+        }
+        for (auto &Symbol : Section.ClassEHs)
+          File->addSymbol(SymbolKind::ObjectiveCClassEHType, Symbol,
+                          Section.Architectures);
+        for (auto &Symbol : Section.IVars) {
+          auto Name = Symbol.value;
+          if (Ctx->FileKind != FileType::TBD_V3)
+            Name = Name.drop_front();
+          File->addSymbol(SymbolKind::ObjectiveCInstanceVariable, Name,
+                          Section.Architectures);
+        }
+        for (auto &Symbol : Section.WeakDefSymbols)
+          File->addSymbol(SymbolKind::GlobalSymbol, Symbol,
+                          Section.Architectures, SymbolFlags::WeakDefined);
+        for (auto &Symbol : Section.TLVSymbols)
+          File->addSymbol(SymbolKind::GlobalSymbol, Symbol,
+                          Section.Architectures, SymbolFlags::ThreadLocalValue);
+      }
+
+      for (const auto &Section : Undefineds) {
+        for (auto &Symbol : Section.Symbols) {
+          if (Ctx->FileKind != FileType::TBD_V3 &&
+              Symbol.value.startswith("_OBJC_EHTYPE_$_"))
+            File->addSymbol(SymbolKind::ObjectiveCClassEHType,
+                            Symbol.value.drop_front(15), Section.Architectures,
+                            SymbolFlags::Undefined);
+          else
+            File->addSymbol(SymbolKind::GlobalSymbol, Symbol,
+                            Section.Architectures, SymbolFlags::Undefined);
+        }
+        for (auto &Symbol : Section.Classes) {
+          auto Name = Symbol.value;
+          if (Ctx->FileKind != FileType::TBD_V3)
+            Name = Name.drop_front();
+          File->addSymbol(SymbolKind::ObjectiveCClass, Name,
+                          Section.Architectures, SymbolFlags::Undefined);
+        }
+        for (auto &Symbol : Section.ClassEHs)
+          File->addSymbol(SymbolKind::ObjectiveCClassEHType, Symbol,
+                          Section.Architectures, SymbolFlags::Undefined);
+        for (auto &Symbol : Section.IVars) {
+          auto Name = Symbol.value;
+          if (Ctx->FileKind != FileType::TBD_V3)
+            Name = Name.drop_front();
+          File->addSymbol(SymbolKind::ObjectiveCInstanceVariable, Name,
+                          Section.Architectures, SymbolFlags::Undefined);
+        }
+        for (auto &Symbol : Section.WeakRefSymbols)
+          File->addSymbol(SymbolKind::GlobalSymbol, Symbol,
+                          Section.Architectures,
+                          SymbolFlags::Undefined | SymbolFlags::WeakReferenced);
+      }
+
+      return File;
+    }
+
+    llvm::BumpPtrAllocator Allocator;
+    StringRef copyString(StringRef String) {
+      if (String.empty())
+        return {};
+
+      void *Ptr = Allocator.Allocate(String.size(), 1);
+      memcpy(Ptr, String.data(), String.size());
+      return StringRef(reinterpret_cast<const char *>(Ptr), String.size());
+    }
+
+    std::vector<Architecture> Architectures;
+    std::vector<UUID> UUIDs;
+    PlatformKind Platform{PlatformKind::unknown};
+    StringRef InstallName;
+    PackedVersion CurrentVersion;
+    PackedVersion CompatibilityVersion;
+    SwiftVersion SwiftABIVersion{0};
+    ObjCConstraintType ObjCConstraint{ObjCConstraintType::None};
+    TBDFlags Flags{TBDFlags::None};
+    StringRef ParentUmbrella;
+    std::vector<ExportSection> Exports;
+    std::vector<UndefinedSection> Undefineds;
+  };
+
+  static void mapping(IO &IO, const InterfaceFile *&File) {
+    auto *Ctx = reinterpret_cast<TextAPIContext *>(IO.getContext());
+    assert((!Ctx || !IO.outputting() ||
+            (Ctx && Ctx->FileKind != FileType::Invalid)) &&
+           "File type is not set in YAML context");
+    MappingNormalization<NormalizedTBD, const InterfaceFile *> Keys(IO, File);
+
+    // prope file type when reading.
+    if (!IO.outputting()) {
+      if (IO.mapTag("!tapi-tbd-v2", false))
+        Ctx->FileKind = FileType::TBD_V2;
+      else if (IO.mapTag("!tapi-tbd-v3", false))
+        Ctx->FileKind = FileType::TBD_V2;
+      else if (IO.mapTag("!tapi-tbd-v1", false) ||
+               IO.mapTag("tag:yaml.org,2002:map", false))
+        Ctx->FileKind = FileType::TBD_V1;
+      else {
+        IO.setError("unsupported file type");
+        return;
+      }
+    }
+
+    // Set file tyoe when writing.
+    if (IO.outputting()) {
+      switch (Ctx->FileKind) {
+      default:
+        llvm_unreachable("unexpected file type");
+      case FileType::TBD_V1:
+        // Don't write the tag into the .tbd file for TBD v1.
+        break;
+      case FileType::TBD_V2:
+        IO.mapTag("!tapi-tbd-v2", true);
+        break;
+      case FileType::TBD_V3:
+        IO.mapTag("!tapi-tbd-v3", true);
+        break;
+      }
+    }
+
+    IO.mapRequired("archs", Keys->Architectures);
+    if (Ctx->FileKind != FileType::TBD_V1)
+      IO.mapOptional("uuids", Keys->UUIDs);
+    IO.mapRequired("platform", Keys->Platform);
+    if (Ctx->FileKind != FileType::TBD_V1)
+      IO.mapOptional("flags", Keys->Flags, TBDFlags::None);
+    IO.mapRequired("install-name", Keys->InstallName);
+    IO.mapOptional("current-version", Keys->CurrentVersion,
+                   PackedVersion(1, 0, 0));
+    IO.mapOptional("compatibility-version", Keys->CompatibilityVersion,
+                   PackedVersion(1, 0, 0));
+    if (Ctx->FileKind != FileType::TBD_V3)
+      IO.mapOptional("swift-version", Keys->SwiftABIVersion, SwiftVersion(0));
+    else
+      IO.mapOptional("swift-abi-version", Keys->SwiftABIVersion,
+                     SwiftVersion(0));
+    IO.mapOptional("objc-constraint", Keys->ObjCConstraint,
+                   (Ctx->FileKind == FileType::TBD_V1)
+                       ? ObjCConstraintType::None
+                       : ObjCConstraintType::Retain_Release);
+    if (Ctx->FileKind != FileType::TBD_V1)
+      IO.mapOptional("parent-umbrella", Keys->ParentUmbrella, StringRef());
+    IO.mapOptional("exports", Keys->Exports);
+    if (Ctx->FileKind != FileType::TBD_V1)
+      IO.mapOptional("undefineds", Keys->Undefineds);
+  }
+};
+
+template <>
+struct DocumentListTraits<std::vector<const MachO::InterfaceFile *>> {
+  static size_t size(IO &IO, std::vector<const MachO::InterfaceFile *> &Seq) {
+    return Seq.size();
+  }
+  static const InterfaceFile *&
+  element(IO &IO, std::vector<const InterfaceFile *> &Seq, size_t Index) {
+    if (Index >= Seq.size())
+      Seq.resize(Index + 1);
+    return Seq[Index];
+  }
+};
+
+} // end namespace yaml.
+
+namespace MachO {
+static void DiagHandler(const SMDiagnostic &Diag, void *Context) {
+  auto *File = static_cast<TextAPIContext *>(Context);
+  SmallString<1024> Message;
+  raw_svector_ostream S(Message);
+
+  SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), File->Path,
+                       Diag.getLineNo(), Diag.getColumnNo(), Diag.getKind(),
+                       Diag.getMessage(), Diag.getLineContents(),
+                       Diag.getRanges(), Diag.getFixIts());
+
+  NewDiag.print(nullptr, S);
+  File->ErrorMessage = ("malformed file\n" + Message).str();
+}
+
+Expected<std::unique_ptr<InterfaceFile>>
+TextAPIReader::get(std::unique_ptr<MemoryBuffer> InputBuffer) {
+  TextAPIContext Ctx;
+  Ctx.Path = InputBuffer->getBufferIdentifier();
+  yaml::Input YAMLIn(InputBuffer->getBuffer(), &Ctx, DiagHandler, &Ctx);
+
+  // Fill vector with interface file objects created by parsing the YAML file.
+  std::vector<const InterfaceFile *> Files;
+  YAMLIn >> Files;
+
+  auto File = std::unique_ptr<InterfaceFile>(
+      const_cast<InterfaceFile *>(Files.front()));
+
+  if (YAMLIn.error())
+    return make_error<StringError>(Ctx.ErrorMessage, YAMLIn.error());
+
+  return std::move(File);
+}
+
+Error TextAPIWriter::writeToStream(raw_ostream &OS, const InterfaceFile &File) {
+  TextAPIContext Ctx;
+  Ctx.Path = File.getPath();
+  Ctx.FileKind = File.getFileType();
+  llvm::yaml::Output YAMLOut(OS, &Ctx, /*WrapColumn=*/80);
+
+  std::vector<const InterfaceFile *> Files;
+  Files.emplace_back(&File);
+
+  // Stream out yaml.
+  YAMLOut << Files;
+
+  return Error::success();
+}
+
+} // end namespace MachO.
+} // end namespace llvm.
diff --git a/lib/TextAPI/MachO/TextStubCommon.cpp b/lib/TextAPI/MachO/TextStubCommon.cpp
new file mode 100644
index 000000000000..00382cd24573
--- /dev/null
+++ b/lib/TextAPI/MachO/TextStubCommon.cpp
@@ -0,0 +1,178 @@
+//===- TextStubCommon.cpp -------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Implememts common Text Stub YAML mappings.
+//
+//===----------------------------------------------------------------------===//
+
+#include "TextStubCommon.h"
+#include "TextAPIContext.h"
+
+using namespace llvm::MachO;
+
+namespace llvm {
+namespace yaml {
+
+void ScalarTraits<FlowStringRef>::output(const FlowStringRef &Value, void *Ctx,
+                                         raw_ostream &OS) {
+  ScalarTraits<StringRef>::output(Value, Ctx, OS);
+}
+StringRef ScalarTraits<FlowStringRef>::input(StringRef Value, void *Ctx,
+                                             FlowStringRef &Out) {
+  return ScalarTraits<StringRef>::input(Value, Ctx, Out.value);
+}
+QuotingType ScalarTraits<FlowStringRef>::mustQuote(StringRef Name) {
+  return ScalarTraits<StringRef>::mustQuote(Name);
+}
+
+void ScalarEnumerationTraits<ObjCConstraintType>::enumeration(
+    IO &IO, ObjCConstraintType &Constraint) {
+  IO.enumCase(Constraint, "none", ObjCConstraintType::None);
+  IO.enumCase(Constraint, "retain_release", ObjCConstraintType::Retain_Release);
+  IO.enumCase(Constraint, "retain_release_for_simulator",
+              ObjCConstraintType::Retain_Release_For_Simulator);
+  IO.enumCase(Constraint, "retain_release_or_gc",
+              ObjCConstraintType::Retain_Release_Or_GC);
+  IO.enumCase(Constraint, "gc", ObjCConstraintType::GC);
+}
+
+void ScalarTraits<PlatformKind>::output(const PlatformKind &Value, void *,
+                                        raw_ostream &OS) {
+  switch (Value) {
+  default:
+    llvm_unreachable("unexpected platform");
+    break;
+  case PlatformKind::macOS:
+    OS << "macosx";
+    break;
+  case PlatformKind::iOS:
+    OS << "ios";
+    break;
+  case PlatformKind::watchOS:
+    OS << "watchos";
+    break;
+  case PlatformKind::tvOS:
+    OS << "tvos";
+    break;
+  case PlatformKind::bridgeOS:
+    OS << "bridgeos";
+    break;
+  }
+}
+StringRef ScalarTraits<PlatformKind>::input(StringRef Scalar, void *,
+                                            PlatformKind &Value) {
+  Value = StringSwitch<PlatformKind>(Scalar)
+              .Case("macosx", PlatformKind::macOS)
+              .Case("ios", PlatformKind::iOS)
+              .Case("watchos", PlatformKind::watchOS)
+              .Case("tvos", PlatformKind::tvOS)
+              .Case("bridgeos", PlatformKind::bridgeOS)
+              .Default(PlatformKind::unknown);
+
+  if (Value == PlatformKind::unknown)
+    return "unknown platform";
+  return {};
+}
+QuotingType ScalarTraits<PlatformKind>::mustQuote(StringRef) {
+  return QuotingType::None;
+}
+
+void ScalarBitSetTraits<ArchitectureSet>::bitset(IO &IO,
+                                                 ArchitectureSet &Archs) {
+#define ARCHINFO(arch, type, subtype)                                          \
+  IO.bitSetCase(Archs, #arch, 1U << static_cast<int>(AK_##arch));
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+}
+
+void ScalarTraits<Architecture>::output(const Architecture &Value, void *,
+                                        raw_ostream &OS) {
+  OS << Value;
+}
+StringRef ScalarTraits<Architecture>::input(StringRef Scalar, void *,
+                                            Architecture &Value) {
+  Value = getArchitectureFromName(Scalar);
+  return {};
+}
+QuotingType ScalarTraits<Architecture>::mustQuote(StringRef) {
+  return QuotingType::None;
+}
+
+void ScalarTraits<PackedVersion>::output(const PackedVersion &Value, void *,
+                                         raw_ostream &OS) {
+  OS << Value;
+}
+StringRef ScalarTraits<PackedVersion>::input(StringRef Scalar, void *,
+                                             PackedVersion &Value) {
+  if (!Value.parse32(Scalar))
+    return "invalid packed version string.";
+  return {};
+}
+QuotingType ScalarTraits<PackedVersion>::mustQuote(StringRef) {
+  return QuotingType::None;
+}
+
+void ScalarTraits<SwiftVersion>::output(const SwiftVersion &Value, void *,
+                                        raw_ostream &OS) {
+  switch (Value) {
+  case 1:
+    OS << "1.0";
+    break;
+  case 2:
+    OS << "1.1";
+    break;
+  case 3:
+    OS << "2.0";
+    break;
+  case 4:
+    OS << "3.0";
+    break;
+  default:
+    OS << (unsigned)Value;
+    break;
+  }
+}
+StringRef ScalarTraits<SwiftVersion>::input(StringRef Scalar, void *,
+                                            SwiftVersion &Value) {
+  Value = StringSwitch<SwiftVersion>(Scalar)
+              .Case("1.0", 1)
+              .Case("1.1", 2)
+              .Case("2.0", 3)
+              .Case("3.0", 4)
+              .Default(0);
+  if (Value != SwiftVersion(0))
+    return {};
+
+  if (Scalar.getAsInteger(10, Value))
+    return "invalid Swift ABI version.";
+
+  return StringRef();
+}
+QuotingType ScalarTraits<SwiftVersion>::mustQuote(StringRef) {
+  return QuotingType::None;
+}
+
+void ScalarTraits<UUID>::output(const UUID &Value, void *, raw_ostream &OS) {
+  OS << Value.first << ": " << Value.second;
+}
+StringRef ScalarTraits<UUID>::input(StringRef Scalar, void *, UUID &Value) {
+  auto Split = Scalar.split(':');
+  auto Arch = Split.first.trim();
+  auto UUID = Split.second.trim();
+  if (UUID.empty())
+    return "invalid uuid string pair";
+  Value.first = getArchitectureFromName(Arch);
+  Value.second = UUID;
+  return {};
+}
+QuotingType ScalarTraits<UUID>::mustQuote(StringRef) {
+  return QuotingType::Single;
+}
+
+} // end namespace yaml.
+} // end namespace llvm.
diff --git a/lib/TextAPI/MachO/TextStubCommon.h b/lib/TextAPI/MachO/TextStubCommon.h
new file mode 100644
index 000000000000..c4dd1075b1c8
--- /dev/null
+++ b/lib/TextAPI/MachO/TextStubCommon.h
@@ -0,0 +1,81 @@
+//===- TextStubCommon.h ---------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines common Text Stub YAML mappings.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TEXTAPI_TEXT_STUB_COMMON_H
+#define LLVM_TEXTAPI_TEXT_STUB_COMMON_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/Support/YAMLTraits.h"
+#include "llvm/TextAPI/MachO/Architecture.h"
+#include "llvm/TextAPI/MachO/ArchitectureSet.h"
+#include "llvm/TextAPI/MachO/InterfaceFile.h"
+#include "llvm/TextAPI/MachO/PackedVersion.h"
+
+using UUID = std::pair<llvm::MachO::Architecture, std::string>;
+
+LLVM_YAML_STRONG_TYPEDEF(llvm::StringRef, FlowStringRef)
+LLVM_YAML_STRONG_TYPEDEF(uint8_t, SwiftVersion)
+LLVM_YAML_IS_FLOW_SEQUENCE_VECTOR(UUID)
+LLVM_YAML_IS_FLOW_SEQUENCE_VECTOR(FlowStringRef)
+
+namespace llvm {
+namespace yaml {
+
+template <> struct ScalarTraits<FlowStringRef> {
+  static void output(const FlowStringRef &, void *, raw_ostream &);
+  static StringRef input(StringRef, void *, FlowStringRef &);
+  static QuotingType mustQuote(StringRef);
+};
+
+template <> struct ScalarEnumerationTraits<MachO::ObjCConstraintType> {
+  static void enumeration(IO &, MachO::ObjCConstraintType &);
+};
+
+template <> struct ScalarTraits<MachO::PlatformKind> {
+  static void output(const MachO::PlatformKind &, void *, raw_ostream &);
+  static StringRef input(StringRef, void *, MachO::PlatformKind &);
+  static QuotingType mustQuote(StringRef);
+};
+
+template <> struct ScalarBitSetTraits<MachO::ArchitectureSet> {
+  static void bitset(IO &, MachO::ArchitectureSet &);
+};
+
+template <> struct ScalarTraits<MachO::Architecture> {
+  static void output(const MachO::Architecture &, void *, raw_ostream &);
+  static StringRef input(StringRef, void *, MachO::Architecture &);
+  static QuotingType mustQuote(StringRef);
+};
+
+template <> struct ScalarTraits<MachO::PackedVersion> {
+  static void output(const MachO::PackedVersion &, void *, raw_ostream &);
+  static StringRef input(StringRef, void *, MachO::PackedVersion &);
+  static QuotingType mustQuote(StringRef);
+};
+
+template <> struct ScalarTraits<SwiftVersion> {
+  static void output(const SwiftVersion &, void *, raw_ostream &);
+  static StringRef input(StringRef, void *, SwiftVersion &);
+  static QuotingType mustQuote(StringRef);
+};
+
+template <> struct ScalarTraits<UUID> {
+  static void output(const UUID &, void *, raw_ostream &);
+  static StringRef input(StringRef, void *, UUID &);
+  static QuotingType mustQuote(StringRef);
+};
+
+} // end namespace yaml.
+} // end namespace llvm.
+
+#endif // LLVM_TEXTAPI_TEXT_STUB_COMMON_H