vendor/llvm/llvm-trunk-r366426

10 files changed, 909 insertions, 8 deletions

diff --git a/include/llvm/TextAPI/ELF/ELFStub.h b/include/llvm/TextAPI/ELF/ELFStub.h
index fa54e6f8b711..76b2af121662 100644
--- a/include/llvm/TextAPI/ELF/ELFStub.h
+++ b/include/llvm/TextAPI/ELF/ELFStub.h
@@ -1,9 +1,8 @@
 //===- ELFStub.h ------------------------------------------------*- C++ -*-===//
 //
-//                     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/include/llvm/TextAPI/ELF/TBEHandler.h b/include/llvm/TextAPI/ELF/TBEHandler.h
index 91521c656fa2..1748fd13f3dc 100644
--- a/include/llvm/TextAPI/ELF/TBEHandler.h
+++ b/include/llvm/TextAPI/ELF/TBEHandler.h
@@ -1,9 +1,8 @@
 //===- TBEHandler.h ---------------------------------------------*- C++ -*-===//
 //
-//                     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/include/llvm/TextAPI/MachO/Architecture.def b/include/llvm/TextAPI/MachO/Architecture.def
new file mode 100644
index 000000000000..4c695fe18eec
--- /dev/null
+++ b/include/llvm/TextAPI/MachO/Architecture.def
@@ -0,0 +1,38 @@
+//===- llvm/TextAPI/MachO/Architecture.def - Architecture -----------------===//
+//
+// 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 ARCHINFO
+#define ARCHINFO(arch)
+#endif
+
+///
+/// X86 architectures sorted by cpu type and sub type id.
+///
+ARCHINFO(i386, MachO::CPU_TYPE_I386, MachO::CPU_SUBTYPE_I386_ALL)
+ARCHINFO(x86_64, MachO::CPU_TYPE_X86_64, MachO::CPU_SUBTYPE_X86_64_ALL)
+ARCHINFO(x86_64h, MachO::CPU_TYPE_X86_64, MachO::CPU_SUBTYPE_X86_64_H)
+
+
+///
+/// ARM architectures sorted by cpu sub type id.
+///
+ARCHINFO(armv4t, MachO::CPU_TYPE_ARM, MachO::CPU_SUBTYPE_ARM_V4T)
+ARCHINFO(armv6, MachO::CPU_TYPE_ARM, MachO::CPU_SUBTYPE_ARM_V6)
+ARCHINFO(armv5, MachO::CPU_TYPE_ARM, MachO::CPU_SUBTYPE_ARM_V5TEJ)
+ARCHINFO(armv7, MachO::CPU_TYPE_ARM, MachO::CPU_SUBTYPE_ARM_V7)
+ARCHINFO(armv7s, MachO::CPU_TYPE_ARM, MachO::CPU_SUBTYPE_ARM_V7S)
+ARCHINFO(armv7k, MachO::CPU_TYPE_ARM, MachO::CPU_SUBTYPE_ARM_V7K)
+ARCHINFO(armv6m, MachO::CPU_TYPE_ARM, MachO::CPU_SUBTYPE_ARM_V6M)
+ARCHINFO(armv7m, MachO::CPU_TYPE_ARM, MachO::CPU_SUBTYPE_ARM_V7M)
+ARCHINFO(armv7em, MachO::CPU_TYPE_ARM, MachO::CPU_SUBTYPE_ARM_V7EM)
+
+
+///
+/// ARM64 architectures sorted by cpu sub type id.
+///
+ARCHINFO(arm64, MachO::CPU_TYPE_ARM64, MachO::CPU_SUBTYPE_ARM64_ALL)
diff --git a/include/llvm/TextAPI/MachO/Architecture.h b/include/llvm/TextAPI/MachO/Architecture.h
new file mode 100644
index 000000000000..055baeb0c0f0
--- /dev/null
+++ b/include/llvm/TextAPI/MachO/Architecture.h
@@ -0,0 +1,47 @@
+//===- llvm/TextAPI/MachO/Architecture.h - Architecture ---------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines the architecture enum and helper methods.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TEXTAPI_MACHO_ARCHITECTURE_H
+#define LLVM_TEXTAPI_MACHO_ARCHITECTURE_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+namespace MachO {
+
+/// Defines the architecture slices that are supported by Text-based Stub files.
+enum Architecture : uint8_t {
+#define ARCHINFO(Arch, Type, SubType) AK_##Arch,
+#include "llvm/TextAPI/MachO/Architecture.def"
+#undef ARCHINFO
+  AK_unknown, // this has to go last.
+};
+
+/// Convert a CPU Type and Subtype pair to an architecture slice.
+Architecture getArchitectureFromCpuType(uint32_t CPUType, uint32_t CPUSubType);
+
+/// Convert a name to an architecture slice.
+Architecture getArchitectureFromName(StringRef Name);
+
+/// Convert an architecture slice to a string.
+StringRef getArchitectureName(Architecture Arch);
+
+/// Convert an architecture slice to a CPU Type and Subtype pair.
+std::pair<uint32_t, uint32_t> getCPUTypeFromArchitecture(Architecture Arch);
+
+raw_ostream &operator<<(raw_ostream &OS, Architecture Arch);
+
+} // end namespace MachO.
+} // end namespace llvm.
+
+#endif // LLVM_TEXTAPI_MACHO_ARCHITECTURE_H
diff --git a/include/llvm/TextAPI/MachO/ArchitectureSet.h b/include/llvm/TextAPI/MachO/ArchitectureSet.h
new file mode 100644
index 000000000000..d8dfc7f1af21
--- /dev/null
+++ b/include/llvm/TextAPI/MachO/ArchitectureSet.h
@@ -0,0 +1,159 @@
+//===- llvm/TextAPI/MachO/ArchitectureSet.h - ArchitectureSet ---*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines the architecture set.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TEXTAPI_MACHO_ARCHITECTURE_SET_H
+#define LLVM_TEXTAPI_MACHO_ARCHITECTURE_SET_H
+
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/TextAPI/MachO/Architecture.h"
+#include <cstddef>
+#include <iterator>
+#include <limits>
+#include <vector>
+
+namespace llvm {
+namespace MachO {
+
+class ArchitectureSet {
+private:
+  using ArchSetType = uint32_t;
+
+  const static ArchSetType EndIndexVal =
+      std::numeric_limits<ArchSetType>::max();
+  ArchSetType ArchSet{0};
+
+public:
+  constexpr ArchitectureSet() = default;
+  constexpr ArchitectureSet(ArchSetType Raw) : ArchSet(Raw) {}
+  ArchitectureSet(Architecture Arch) : ArchitectureSet() { set(Arch); }
+  ArchitectureSet(const std::vector<Architecture> &Archs);
+
+  void set(Architecture Arch) {
+    if (Arch == AK_unknown)
+      return;
+    ArchSet |= 1U << static_cast<int>(Arch);
+  }
+
+  void clear(Architecture Arch) { ArchSet &= ~(1U << static_cast<int>(Arch)); }
+
+  bool has(Architecture Arch) const {
+    return ArchSet & (1U << static_cast<int>(Arch));
+  }
+
+  bool contains(ArchitectureSet Archs) const {
+    return (ArchSet & Archs.ArchSet) == Archs.ArchSet;
+  }
+
+  size_t count() const;
+
+  bool empty() const { return ArchSet == 0; }
+
+  ArchSetType rawValue() const { return ArchSet; }
+
+  template <typename Ty>
+  class arch_iterator
+      : public std::iterator<std::forward_iterator_tag, Architecture, size_t> {
+  private:
+    ArchSetType Index;
+    Ty *ArchSet;
+
+    void findNextSetBit() {
+      if (Index == EndIndexVal)
+        return;
+      while (++Index < sizeof(Ty) * 8) {
+        if (*ArchSet & (1UL << Index))
+          return;
+      }
+
+      Index = EndIndexVal;
+    }
+
+  public:
+    arch_iterator(Ty *ArchSet, ArchSetType Index = 0)
+        : Index(Index), ArchSet(ArchSet) {
+      if (Index != EndIndexVal && !(*ArchSet & (1UL << Index)))
+        findNextSetBit();
+    }
+
+    Architecture operator*() const { return static_cast<Architecture>(Index); }
+
+    arch_iterator &operator++() {
+      findNextSetBit();
+      return *this;
+    }
+
+    arch_iterator operator++(int) {
+      auto tmp = *this;
+      findNextSetBit();
+      return tmp;
+    }
+
+    bool operator==(const arch_iterator &o) const {
+      return std::tie(Index, ArchSet) == std::tie(o.Index, o.ArchSet);
+    }
+
+    bool operator!=(const arch_iterator &o) const { return !(*this == o); }
+  };
+
+  ArchitectureSet operator&(const ArchitectureSet &o) {
+    return {ArchSet & o.ArchSet};
+  }
+
+  ArchitectureSet operator|(const ArchitectureSet &o) {
+    return {ArchSet | o.ArchSet};
+  }
+
+  ArchitectureSet &operator|=(const ArchitectureSet &o) {
+    ArchSet |= o.ArchSet;
+    return *this;
+  }
+
+  ArchitectureSet &operator|=(const Architecture &Arch) {
+    set(Arch);
+    return *this;
+  }
+
+  bool operator==(const ArchitectureSet &o) const {
+    return ArchSet == o.ArchSet;
+  }
+
+  bool operator!=(const ArchitectureSet &o) const {
+    return ArchSet != o.ArchSet;
+  }
+
+  bool operator<(const ArchitectureSet &o) const { return ArchSet < o.ArchSet; }
+
+  using iterator = arch_iterator<ArchSetType>;
+  using const_iterator = arch_iterator<const ArchSetType>;
+
+  iterator begin() { return {&ArchSet}; }
+  iterator end() { return {&ArchSet, EndIndexVal}; }
+
+  const_iterator begin() const { return {&ArchSet}; }
+  const_iterator end() const { return {&ArchSet, EndIndexVal}; }
+
+  operator std::string() const;
+  operator std::vector<Architecture>() const;
+  void print(raw_ostream &OS) const;
+};
+
+inline ArchitectureSet operator|(const Architecture &lhs,
+                                 const Architecture &rhs) {
+  return ArchitectureSet(lhs) | ArchitectureSet(rhs);
+}
+
+raw_ostream &operator<<(raw_ostream &OS, ArchitectureSet Set);
+
+} // end namespace MachO.
+} // end namespace llvm.
+
+#endif // LLVM_TEXTAPI_MACHO_ARCHITECTURE_SET_H
diff --git a/include/llvm/TextAPI/MachO/InterfaceFile.h b/include/llvm/TextAPI/MachO/InterfaceFile.h
new file mode 100644
index 000000000000..e722449d52f1
--- /dev/null
+++ b/include/llvm/TextAPI/MachO/InterfaceFile.h
@@ -0,0 +1,436 @@
+//===- llvm/TextAPI/MachO/IntefaceFile.h - TAPI Interface File --*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// A generic and abstract interface representation for linkable objects. This
+// could be an MachO executable, bundle, dylib, or text-based stub file.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TEXTAPI_MACHO_INTERFACE_FILE_H
+#define LLVM_TEXTAPI_MACHO_INTERFACE_FILE_H
+
+#include "llvm/ADT/BitmaskEnum.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/Hashing.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/iterator.h"
+#include "llvm/BinaryFormat/MachO.h"
+#include "llvm/BinaryFormat/Magic.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/Error.h"
+#include "llvm/TextAPI/MachO/Architecture.h"
+#include "llvm/TextAPI/MachO/ArchitectureSet.h"
+#include "llvm/TextAPI/MachO/PackedVersion.h"
+#include "llvm/TextAPI/MachO/Symbol.h"
+
+namespace llvm {
+namespace MachO {
+
+/// Defines the list of MachO platforms.
+enum class PlatformKind : unsigned {
+  unknown,
+  macOS = MachO::PLATFORM_MACOS,
+  iOS = MachO::PLATFORM_IOS,
+  tvOS = MachO::PLATFORM_TVOS,
+  watchOS = MachO::PLATFORM_WATCHOS,
+  bridgeOS = MachO::PLATFORM_BRIDGEOS,
+};
+
+/// Defines a list of Objective-C constraints.
+enum class ObjCConstraintType : unsigned {
+  /// No constraint.
+  None = 0,
+
+  /// Retain/Release.
+  Retain_Release = 1,
+
+  /// Retain/Release for Simulator.
+  Retain_Release_For_Simulator = 2,
+
+  /// Retain/Release or Garbage Collection.
+  Retain_Release_Or_GC = 3,
+
+  /// Garbage Collection.
+  GC = 4,
+};
+
+// clang-format off
+
+/// Defines the file type this file represents.
+enum FileType : unsigned {
+  /// Invalid file type.
+  Invalid = 0U,
+
+  /// Text-based stub file (.tbd) version 1.0
+  TBD_V1  = 1U <<  0,
+
+  /// Text-based stub file (.tbd) version 2.0
+  TBD_V2  = 1U <<  1,
+
+  /// Text-based stub file (.tbd) version 3.0
+  TBD_V3  = 1U <<  2,
+
+  All     = ~0U,
+
+  LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/All),
+};
+
+// clang-format on
+
+/// Reference to an interface file.
+class InterfaceFileRef {
+public:
+  InterfaceFileRef() = default;
+
+  InterfaceFileRef(StringRef InstallName) : InstallName(InstallName) {}
+
+  InterfaceFileRef(StringRef InstallName, ArchitectureSet Archs)
+      : InstallName(InstallName), Architectures(Archs) {}
+
+  StringRef getInstallName() const { return InstallName; };
+  void addArchitectures(ArchitectureSet Archs) { Architectures |= Archs; }
+  ArchitectureSet getArchitectures() const { return Architectures; }
+  bool hasArchitecture(Architecture Arch) const {
+    return Architectures.has(Arch);
+  }
+
+  bool operator==(const InterfaceFileRef &O) const {
+    return std::tie(InstallName, Architectures) ==
+           std::tie(O.InstallName, O.Architectures);
+  }
+
+  bool operator<(const InterfaceFileRef &O) const {
+    return std::tie(InstallName, Architectures) <
+           std::tie(O.InstallName, O.Architectures);
+  }
+
+private:
+  std::string InstallName;
+  ArchitectureSet Architectures;
+};
+
+} // end namespace MachO.
+
+struct SymbolsMapKey {
+  MachO::SymbolKind Kind;
+  StringRef Name;
+
+  SymbolsMapKey(MachO::SymbolKind Kind, StringRef Name)
+      : Kind(Kind), Name(Name) {}
+};
+template <> struct DenseMapInfo<SymbolsMapKey> {
+  static inline SymbolsMapKey getEmptyKey() {
+    return SymbolsMapKey(MachO::SymbolKind::GlobalSymbol, StringRef{});
+  }
+
+  static inline SymbolsMapKey getTombstoneKey() {
+    return SymbolsMapKey(MachO::SymbolKind::ObjectiveCInstanceVariable,
+                         StringRef{});
+  }
+
+  static unsigned getHashValue(const SymbolsMapKey &Key) {
+    return hash_combine(hash_value(Key.Kind), hash_value(Key.Name));
+  }
+
+  static bool isEqual(const SymbolsMapKey &LHS, const SymbolsMapKey &RHS) {
+    return std::tie(LHS.Kind, LHS.Name) == std::tie(RHS.Kind, RHS.Name);
+  }
+};
+
+namespace MachO {
+
+/// Defines the interface file.
+class InterfaceFile {
+public:
+  /// Set the path from which this file was generated (if applicable).
+  ///
+  /// \param Path_ The path to the source file.
+  void setPath(StringRef Path_) { Path = Path_; }
+
+  /// Get the path from which this file was generated (if applicable).
+  ///
+  /// \return The path to the source file or empty.
+  StringRef getPath() const { return Path; }
+
+  /// Set the file type.
+  ///
+  /// This is used by the YAML writer to identify the specification it should
+  /// use for writing the file.
+  ///
+  /// \param Kind The file type.
+  void setFileType(FileType Kind) { FileKind = Kind; }
+
+  /// Get the file type.
+  ///
+  /// \return The file type.
+  FileType getFileType() const { return FileKind; }
+
+  /// Set the platform.
+  void setPlatform(PlatformKind Platform_) { Platform = Platform_; }
+
+  /// Get the platform.
+  PlatformKind getPlatform() const { return Platform; }
+
+  /// Specify the set of supported architectures by this file.
+  void setArchitectures(ArchitectureSet Architectures_) {
+    Architectures = Architectures_;
+  }
+
+  /// Add the set of supported architectures by this file.
+  void addArchitectures(ArchitectureSet Architectures_) {
+    Architectures |= Architectures_;
+  }
+
+  /// Add supported architecture by this file..
+  void addArch(Architecture Arch) { Architectures.set(Arch); }
+
+  /// Get the set of supported architectures.
+  ArchitectureSet getArchitectures() const { return Architectures; }
+
+  /// Set the install name of the library.
+  void setInstallName(StringRef InstallName_) { InstallName = InstallName_; }
+
+  /// Get the install name of the library.
+  StringRef getInstallName() const { return InstallName; }
+
+  /// Set the current version of the library.
+  void setCurrentVersion(PackedVersion Version) { CurrentVersion = Version; }
+
+  /// Get the current version of the library.
+  PackedVersion getCurrentVersion() const { return CurrentVersion; }
+
+  /// Set the compatibility version of the library.
+  void setCompatibilityVersion(PackedVersion Version) {
+    CompatibilityVersion = Version;
+  }
+
+  /// Get the compatibility version of the library.
+  PackedVersion getCompatibilityVersion() const { return CompatibilityVersion; }
+
+  /// Set the Swift ABI version of the library.
+  void setSwiftABIVersion(uint8_t Version) { SwiftABIVersion = Version; }
+
+  /// Get the Swift ABI version of the library.
+  uint8_t getSwiftABIVersion() const { return SwiftABIVersion; }
+
+  /// Specify if the library uses two-level namespace (or flat namespace).
+  void setTwoLevelNamespace(bool V = true) { IsTwoLevelNamespace = V; }
+
+  /// Check if the library uses two-level namespace.
+  bool isTwoLevelNamespace() const { return IsTwoLevelNamespace; }
+
+  /// Specify if the library is application extension safe (or not).
+  void setApplicationExtensionSafe(bool V = true) { IsAppExtensionSafe = V; }
+
+  /// Check if the library is application extension safe.
+  bool isApplicationExtensionSafe() const { return IsAppExtensionSafe; }
+
+  /// Set the Objective-C constraint.
+  void setObjCConstraint(ObjCConstraintType Constraint) {
+    ObjcConstraint = Constraint;
+  }
+
+  /// Get the Objective-C constraint.
+  ObjCConstraintType getObjCConstraint() const { return ObjcConstraint; }
+
+  /// Specify if this file was generated during InstallAPI (or not).
+  void setInstallAPI(bool V = true) { IsInstallAPI = V; }
+
+  /// Check if this file was generated during InstallAPI.
+  bool isInstallAPI() const { return IsInstallAPI; }
+
+  /// Set the parent umbrella framework.
+  void setParentUmbrella(StringRef Parent) { ParentUmbrella = Parent; }
+
+  /// Get the parent umbrella framework.
+  StringRef getParentUmbrella() const { return ParentUmbrella; }
+
+  /// Add an allowable client.
+  ///
+  /// Mach-O Dynamic libraries have the concept of allowable clients that are
+  /// checked during static link time. The name of the application or library
+  /// that is being generated needs to match one of the allowable clients or the
+  /// linker refuses to link this library.
+  ///
+  /// \param Name The name of the client that is allowed to link this library.
+  /// \param Architectures The set of architecture for which this applies.
+  void addAllowableClient(StringRef Name, ArchitectureSet Architectures);
+
+  /// Get the list of allowable clients.
+  ///
+  /// \return Returns a list of allowable clients.
+  const std::vector<InterfaceFileRef> &allowableClients() const {
+    return AllowableClients;
+  }
+
+  /// Add a re-exported library.
+  ///
+  /// \param InstallName The name of the library to re-export.
+  /// \param Architectures The set of architecture for which this applies.
+  void addReexportedLibrary(StringRef InstallName,
+                            ArchitectureSet Architectures);
+
+  /// Get the list of re-exported libraries.
+  ///
+  /// \return Returns a list of re-exported libraries.
+  const std::vector<InterfaceFileRef> &reexportedLibraries() const {
+    return ReexportedLibraries;
+  }
+
+  /// Add an architecture/UUID pair.
+  ///
+  /// \param Arch The architecture for which this applies.
+  /// \param UUID The UUID of the library for the specified architecture.
+  void addUUID(Architecture Arch, StringRef UUID);
+
+  /// Add an architecture/UUID pair.
+  ///
+  /// \param Arch The architecture for which this applies.
+  /// \param UUID The UUID of the library for the specified architecture.
+  void addUUID(Architecture Arch, uint8_t UUID[16]);
+
+  /// Get the list of architecture/UUID pairs.
+  ///
+  /// \return Returns a list of architecture/UUID pairs.
+  const std::vector<std::pair<Architecture, std::string>> &uuids() const {
+    return UUIDs;
+  }
+
+  /// Add a symbol to the symbols list or extend an existing one.
+  void addSymbol(SymbolKind Kind, StringRef Name, ArchitectureSet Architectures,
+                 SymbolFlags Flags = SymbolFlags::None);
+
+  using SymbolMapType = DenseMap<SymbolsMapKey, Symbol *>;
+  struct const_symbol_iterator
+      : public iterator_adaptor_base<
+            const_symbol_iterator, SymbolMapType::const_iterator,
+            std::forward_iterator_tag, const Symbol *, ptrdiff_t,
+            const Symbol *, const Symbol *> {
+    const_symbol_iterator() = default;
+
+    template <typename U>
+    const_symbol_iterator(U &&u)
+        : iterator_adaptor_base(std::forward<U &&>(u)) {}
+
+    reference operator*() const { return I->second; }
+    pointer operator->() const { return I->second; }
+  };
+  using const_symbol_range = iterator_range<const_symbol_iterator>;
+
+  // Custom iterator to return only exported symbols.
+  struct const_export_iterator
+      : public iterator_adaptor_base<
+            const_export_iterator, const_symbol_iterator,
+            std::forward_iterator_tag, const Symbol *> {
+    const_symbol_iterator _end;
+
+    void skipToNextSymbol() {
+      while (I != _end && I->isUndefined())
+        ++I;
+    }
+
+    const_export_iterator() = default;
+    template <typename U>
+    const_export_iterator(U &&it, U &&end)
+        : iterator_adaptor_base(std::forward<U &&>(it)),
+          _end(std::forward<U &&>(end)) {
+      skipToNextSymbol();
+    }
+
+    const_export_iterator &operator++() {
+      ++I;
+      skipToNextSymbol();
+      return *this;
+    }
+
+    const_export_iterator operator++(int) {
+      const_export_iterator tmp(*this);
+      ++(*this);
+      return tmp;
+    }
+  };
+  using const_export_range = llvm::iterator_range<const_export_iterator>;
+
+  // Custom iterator to return only undefined symbols.
+  struct const_undefined_iterator
+      : public iterator_adaptor_base<
+            const_undefined_iterator, const_symbol_iterator,
+            std::forward_iterator_tag, const Symbol *> {
+    const_symbol_iterator _end;
+
+    void skipToNextSymbol() {
+      while (I != _end && !I->isUndefined())
+        ++I;
+    }
+
+    const_undefined_iterator() = default;
+    template <typename U>
+    const_undefined_iterator(U &&it, U &&end)
+        : iterator_adaptor_base(std::forward<U &&>(it)),
+          _end(std::forward<U &&>(end)) {
+      skipToNextSymbol();
+    }
+
+    const_undefined_iterator &operator++() {
+      ++I;
+      skipToNextSymbol();
+      return *this;
+    }
+
+    const_undefined_iterator operator++(int) {
+      const_undefined_iterator tmp(*this);
+      ++(*this);
+      return tmp;
+    }
+  };
+  using const_undefined_range = llvm::iterator_range<const_undefined_iterator>;
+
+  const_symbol_range symbols() const {
+    return {Symbols.begin(), Symbols.end()};
+  }
+  const_export_range exports() const {
+    return {{Symbols.begin(), Symbols.end()}, {Symbols.end(), Symbols.end()}};
+  }
+  const_undefined_range undefineds() const {
+    return {{Symbols.begin(), Symbols.end()}, {Symbols.end(), Symbols.end()}};
+  }
+
+private:
+  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::string Path;
+  FileType FileKind;
+  PlatformKind Platform;
+  ArchitectureSet Architectures;
+  std::string InstallName;
+  PackedVersion CurrentVersion;
+  PackedVersion CompatibilityVersion;
+  uint8_t SwiftABIVersion{0};
+  bool IsTwoLevelNamespace{false};
+  bool IsAppExtensionSafe{false};
+  bool IsInstallAPI{false};
+  ObjCConstraintType ObjcConstraint = ObjCConstraintType::None;
+  std::string ParentUmbrella;
+  std::vector<InterfaceFileRef> AllowableClients;
+  std::vector<InterfaceFileRef> ReexportedLibraries;
+  std::vector<std::pair<Architecture, std::string>> UUIDs;
+  SymbolMapType Symbols;
+};
+
+} // end namespace MachO.
+} // end namespace llvm.
+
+#endif // LLVM_TEXTAPI_MACHO_INTERFACE_FILE_H
diff --git a/include/llvm/TextAPI/MachO/PackedVersion.h b/include/llvm/TextAPI/MachO/PackedVersion.h
new file mode 100644
index 000000000000..2d0138097dd9
--- /dev/null
+++ b/include/llvm/TextAPI/MachO/PackedVersion.h
@@ -0,0 +1,64 @@
+//===- llvm/TextAPI/MachO/PackedVersion.h - PackedVersion -------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// Defines the Mach-O packed version format.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TEXTAPI_MACHO_PACKED_VERSION_H
+#define LLVM_TEXTAPI_MACHO_PACKED_VERSION_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+namespace MachO {
+
+class PackedVersion {
+  uint32_t Version{0};
+
+public:
+  constexpr PackedVersion() = default;
+  explicit constexpr PackedVersion(uint32_t RawVersion) : Version(RawVersion) {}
+  PackedVersion(unsigned Major, unsigned Minor, unsigned Subminor)
+      : Version((Major << 16) | ((Minor & 0xff) << 8) | (Subminor & 0xff)) {}
+
+  bool empty() const { return Version == 0; }
+
+  /// Retrieve the major version number.
+  unsigned getMajor() const { return Version >> 16; }
+
+  /// Retrieve the minor version number, if provided.
+  unsigned getMinor() const { return (Version >> 8) & 0xff; }
+
+  /// Retrieve the subminor version number, if provided.
+  unsigned getSubminor() const { return Version & 0xff; }
+
+  bool parse32(StringRef Str);
+  std::pair<bool, bool> parse64(StringRef Str);
+
+  bool operator<(const PackedVersion &O) const { return Version < O.Version; }
+
+  bool operator==(const PackedVersion &O) const { return Version == O.Version; }
+
+  bool operator!=(const PackedVersion &O) const { return Version != O.Version; }
+
+  uint32_t rawValue() const { return Version; }
+
+  void print(raw_ostream &OS) const;
+};
+
+inline raw_ostream &operator<<(raw_ostream &OS, const PackedVersion &Version) {
+  Version.print(OS);
+  return OS;
+}
+
+} // end namespace MachO.
+} // end namespace llvm.
+
+#endif // LLVM_TEXTAPI_MACHO_PACKED_VERSION_H
diff --git a/include/llvm/TextAPI/MachO/Symbol.h b/include/llvm/TextAPI/MachO/Symbol.h
new file mode 100644
index 000000000000..3c7ff5e0f4ea
--- /dev/null
+++ b/include/llvm/TextAPI/MachO/Symbol.h
@@ -0,0 +1,96 @@
+//===- llvm/TextAPI/Symbol.h - TAPI Symbol ----------------------*- 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_TEXTAPI_MACHO_SYMBOL_H
+#define LLVM_TEXTAPI_MACHO_SYMBOL_H
+
+#include "llvm/ADT/BitmaskEnum.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/TextAPI/MachO/ArchitectureSet.h"
+
+namespace llvm {
+namespace MachO {
+
+// clang-format off
+
+/// Symbol flags.
+enum class SymbolFlags : uint8_t {
+  /// No flags
+  None             = 0,
+
+  /// Thread-local value symbol
+  ThreadLocalValue = 1U << 0,
+
+  /// Weak defined symbol
+  WeakDefined      = 1U << 1,
+
+  /// Weak referenced symbol
+  WeakReferenced   = 1U << 2,
+
+  /// Undefined
+  Undefined        = 1U << 3,
+
+  LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/Undefined),
+};
+
+// clang-format on
+
+enum class SymbolKind : uint8_t {
+  GlobalSymbol,
+  ObjectiveCClass,
+  ObjectiveCClassEHType,
+  ObjectiveCInstanceVariable,
+};
+
+class Symbol {
+public:
+  constexpr Symbol(SymbolKind Kind, StringRef Name,
+                   ArchitectureSet Architectures, SymbolFlags Flags)
+      : Name(Name), Architectures(Architectures), Kind(Kind), Flags(Flags) {}
+
+  SymbolKind getKind() const { return Kind; }
+  StringRef getName() const { return Name; }
+  ArchitectureSet getArchitectures() const { return Architectures; }
+  void addArchitectures(ArchitectureSet Archs) { Architectures |= Archs; }
+  SymbolFlags getFlags() const { return Flags; }
+
+  bool isWeakDefined() const {
+    return (Flags & SymbolFlags::WeakDefined) == SymbolFlags::WeakDefined;
+  }
+
+  bool isWeakReferenced() const {
+    return (Flags & SymbolFlags::WeakReferenced) == SymbolFlags::WeakReferenced;
+  }
+
+  bool isThreadLocalValue() const {
+    return (Flags & SymbolFlags::ThreadLocalValue) ==
+           SymbolFlags::ThreadLocalValue;
+  }
+
+  bool isUndefined() const {
+    return (Flags & SymbolFlags::Undefined) == SymbolFlags::Undefined;
+  }
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+  void dump(raw_ostream &OS) const;
+  void dump() const { dump(llvm::errs()); }
+#endif
+
+private:
+  StringRef Name;
+  ArchitectureSet Architectures;
+  SymbolKind Kind;
+  SymbolFlags Flags;
+};
+
+} // end namespace MachO.
+} // end namespace llvm.
+
+#endif // LLVM_TEXTAPI_MACHO_SYMBOL_H
diff --git a/include/llvm/TextAPI/MachO/TextAPIReader.h b/include/llvm/TextAPI/MachO/TextAPIReader.h
new file mode 100644
index 000000000000..6d9c09de5294
--- /dev/null
+++ b/include/llvm/TextAPI/MachO/TextAPIReader.h
@@ -0,0 +1,34 @@
+//===--- TextAPIReader.h - Text API Reader ----------------------*- 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_TEXTAPI_MACHO_READER_H
+#define LLVM_TEXTAPI_MACHO_READER_H
+
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+namespace llvm {
+namespace MachO {
+
+class InterfaceFile;
+
+class TextAPIReader {
+public:
+  static Expected<std::unique_ptr<InterfaceFile>>
+  get(std::unique_ptr<MemoryBuffer> InputBuffer);
+
+  static Expected<std::unique_ptr<InterfaceFile>>
+  getUnmanaged(llvm::MemoryBuffer *InputBuffer);
+
+  TextAPIReader() = delete;
+};
+
+} // end namespace MachO.
+} // end namespace llvm.
+
+#endif // LLVM_TEXTAPI_MACHO_READER_H
diff --git a/include/llvm/TextAPI/MachO/TextAPIWriter.h b/include/llvm/TextAPI/MachO/TextAPIWriter.h
new file mode 100644
index 000000000000..2a45bb86a332
--- /dev/null
+++ b/include/llvm/TextAPI/MachO/TextAPIWriter.h
@@ -0,0 +1,29 @@
+//===--- TextAPIWriter.h - Text API Writer ----------------------*- 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_TEXTAPI_MACHO_WRITER_H
+#define LLVM_TEXTAPI_MACHO_WRITER_H
+
+#include "llvm/Support/MemoryBuffer.h"
+
+namespace llvm {
+namespace MachO {
+
+class InterfaceFile;
+
+class TextAPIWriter {
+public:
+  TextAPIWriter() = delete;
+
+  static Error writeToStream(raw_ostream &os, const InterfaceFile &);
+};
+
+} // end namespace MachO.
+} // end namespace llvm.
+
+#endif // LLVM_TEXTAPI_MACHO_WRITER_H