Move Object format code to lib/BinaryFormat.

This creates a new library called BinaryFormat that has all of
the headers from llvm/Support containing structure and layout
definitions for various types of binary formats like dwarf, coff,
elf, etc as well as the code for identifying a file from its
magic.

Differential Revision: https://reviews.llvm.org/D33843

llvm-svn: 304864

3 files changed, 2 insertions, 716 deletions

diff --git a/llvm/lib/Support/CMakeLists.txt b/llvm/lib/Support/CMakeLists.txt
index 11c2a6bcf26..0a8e3897cce 100644
--- a/llvm/lib/Support/CMakeLists.txt
+++ b/llvm/lib/Support/CMakeLists.txt
@@ -58,7 +58,6 @@ add_llvm_library(LLVMSupport
   DebugCounter.cpp
   DeltaAlgorithm.cpp
   DAGDeltaAlgorithm.cpp
-  Dwarf.cpp
   Error.cpp
   ErrorHandling.cpp
   FileUtilities.cpp
diff --git a/llvm/lib/Support/Dwarf.cpp b/llvm/lib/Support/Dwarf.cpp
deleted file mode 100644
index 200546857de..00000000000
--- a/llvm/lib/Support/Dwarf.cpp
+++ /dev/null
@@ -1,541 +0,0 @@
-//===-- llvm/Support/Dwarf.cpp - Dwarf Framework ----------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains support for generic dwarf information.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Support/Dwarf.h"
-#include "llvm/ADT/StringSwitch.h"
-#include "llvm/Support/ErrorHandling.h"
-
-using namespace llvm;
-using namespace dwarf;
-
-StringRef llvm::dwarf::TagString(unsigned Tag) {
-  switch (Tag) {
-  default:
-    return StringRef();
-#define HANDLE_DW_TAG(ID, NAME, VERSION, VENDOR)                               \
-  case DW_TAG_##NAME:                                                          \
-    return "DW_TAG_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::getTag(StringRef TagString) {
-  return StringSwitch<unsigned>(TagString)
-#define HANDLE_DW_TAG(ID, NAME, VERSION, VENDOR)                               \
-      .Case("DW_TAG_" #NAME, DW_TAG_##NAME)
-#include "llvm/Support/Dwarf.def"
-      .Default(DW_TAG_invalid);
-}
-
-unsigned llvm::dwarf::TagVersion(dwarf::Tag Tag) {
-  switch (Tag) {
-  default:
-    return 0;
-#define HANDLE_DW_TAG(ID, NAME, VERSION, VENDOR)                               \
-  case DW_TAG_##NAME:                                                          \
-    return VERSION;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::TagVendor(dwarf::Tag Tag) {
-  switch (Tag) {
-  default:
-    return 0;
-#define HANDLE_DW_TAG(ID, NAME, VERSION, VENDOR)                               \
-  case DW_TAG_##NAME:                                                          \
-    return DWARF_VENDOR_##VENDOR;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::ChildrenString(unsigned Children) {
-  switch (Children) {
-  case DW_CHILDREN_no:                   return "DW_CHILDREN_no";
-  case DW_CHILDREN_yes:                  return "DW_CHILDREN_yes";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::AttributeString(unsigned Attribute) {
-  switch (Attribute) {
-  default:
-    return StringRef();
-#define HANDLE_DW_AT(ID, NAME, VERSION, VENDOR)                                \
-  case DW_AT_##NAME:                                                           \
-    return "DW_AT_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::AttributeVersion(dwarf::Attribute Attribute) {
-  switch (Attribute) {
-  default:
-    return 0;
-#define HANDLE_DW_AT(ID, NAME, VERSION, VENDOR)                                \
-  case DW_AT_##NAME:                                                           \
-    return VERSION;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::AttributeVendor(dwarf::Attribute Attribute) {
-  switch (Attribute) {
-  default:
-    return 0;
-#define HANDLE_DW_AT(ID, NAME, VERSION, VENDOR)                                \
-  case DW_AT_##NAME:                                                           \
-    return DWARF_VENDOR_##VENDOR;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::FormEncodingString(unsigned Encoding) {
-  switch (Encoding) {
-  default:
-    return StringRef();
-#define HANDLE_DW_FORM(ID, NAME, VERSION, VENDOR)                              \
-  case DW_FORM_##NAME:                                                         \
-    return "DW_FORM_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::FormVersion(dwarf::Form Form) {
-  switch (Form) {
-  default:
-    return 0;
-#define HANDLE_DW_FORM(ID, NAME, VERSION, VENDOR)                              \
-  case DW_FORM_##NAME:                                                         \
-    return VERSION;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::FormVendor(dwarf::Form Form) {
-  switch (Form) {
-  default:
-    return 0;
-#define HANDLE_DW_FORM(ID, NAME, VERSION, VENDOR)                              \
-  case DW_FORM_##NAME:                                                         \
-    return DWARF_VENDOR_##VENDOR;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::OperationEncodingString(unsigned Encoding) {
-  switch (Encoding) {
-  default:
-    return StringRef();
-#define HANDLE_DW_OP(ID, NAME, VERSION, VENDOR)                                \
-  case DW_OP_##NAME:                                                           \
-    return "DW_OP_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  case DW_OP_LLVM_fragment:
-    return "DW_OP_LLVM_fragment";
-  }
-}
-
-unsigned llvm::dwarf::getOperationEncoding(StringRef OperationEncodingString) {
-  return StringSwitch<unsigned>(OperationEncodingString)
-#define HANDLE_DW_OP(ID, NAME, VERSION, VENDOR)                                \
-      .Case("DW_OP_" #NAME, DW_OP_##NAME)
-#include "llvm/Support/Dwarf.def"
-      .Case("DW_OP_LLVM_fragment", DW_OP_LLVM_fragment)
-      .Default(0);
-}
-
-unsigned llvm::dwarf::OperationVersion(dwarf::LocationAtom Op) {
-  switch (Op) {
-  default:
-    return 0;
-#define HANDLE_DW_OP(ID, NAME, VERSION, VENDOR)                                \
-  case DW_OP_##NAME:                                                           \
-    return VERSION;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::OperationVendor(dwarf::LocationAtom Op) {
-  switch (Op) {
-  default:
-    return 0;
-#define HANDLE_DW_OP(ID, NAME, VERSION, VENDOR)                                \
-  case DW_OP_##NAME:                                                           \
-    return DWARF_VENDOR_##VENDOR;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::AttributeEncodingString(unsigned Encoding) {
-  switch (Encoding) {
-  default:
-    return StringRef();
-#define HANDLE_DW_ATE(ID, NAME, VERSION, VENDOR)                               \
-  case DW_ATE_##NAME:                                                          \
-    return "DW_ATE_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::getAttributeEncoding(StringRef EncodingString) {
-  return StringSwitch<unsigned>(EncodingString)
-#define HANDLE_DW_ATE(ID, NAME, VERSION, VENDOR)                               \
-      .Case("DW_ATE_" #NAME, DW_ATE_##NAME)
-#include "llvm/Support/Dwarf.def"
-      .Default(0);
-}
-
-unsigned llvm::dwarf::AttributeEncodingVersion(dwarf::TypeKind ATE) {
-  switch (ATE) {
-  default:
-    return 0;
-#define HANDLE_DW_ATE(ID, NAME, VERSION, VENDOR)                               \
-  case DW_ATE_##NAME:                                                          \
-    return VERSION;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::AttributeEncodingVendor(dwarf::TypeKind ATE) {
-  switch (ATE) {
-  default:
-    return 0;
-#define HANDLE_DW_ATE(ID, NAME, VERSION, VENDOR)                               \
-  case DW_ATE_##NAME:                                                          \
-    return DWARF_VENDOR_##VENDOR;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::DecimalSignString(unsigned Sign) {
-  switch (Sign) {
-  case DW_DS_unsigned:                   return "DW_DS_unsigned";
-  case DW_DS_leading_overpunch:          return "DW_DS_leading_overpunch";
-  case DW_DS_trailing_overpunch:         return "DW_DS_trailing_overpunch";
-  case DW_DS_leading_separate:           return "DW_DS_leading_separate";
-  case DW_DS_trailing_separate:          return "DW_DS_trailing_separate";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::EndianityString(unsigned Endian) {
-  switch (Endian) {
-  case DW_END_default:                   return "DW_END_default";
-  case DW_END_big:                       return "DW_END_big";
-  case DW_END_little:                    return "DW_END_little";
-  case DW_END_lo_user:                   return "DW_END_lo_user";
-  case DW_END_hi_user:                   return "DW_END_hi_user";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::AccessibilityString(unsigned Access) {
-  switch (Access) {
-  // Accessibility codes
-  case DW_ACCESS_public:                 return "DW_ACCESS_public";
-  case DW_ACCESS_protected:              return "DW_ACCESS_protected";
-  case DW_ACCESS_private:                return "DW_ACCESS_private";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::VisibilityString(unsigned Visibility) {
-  switch (Visibility) {
-  case DW_VIS_local:                     return "DW_VIS_local";
-  case DW_VIS_exported:                  return "DW_VIS_exported";
-  case DW_VIS_qualified:                 return "DW_VIS_qualified";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::VirtualityString(unsigned Virtuality) {
-  switch (Virtuality) {
-  default:
-    return StringRef();
-#define HANDLE_DW_VIRTUALITY(ID, NAME)                                         \
-  case DW_VIRTUALITY_##NAME:                                                   \
-    return "DW_VIRTUALITY_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::getVirtuality(StringRef VirtualityString) {
-  return StringSwitch<unsigned>(VirtualityString)
-#define HANDLE_DW_VIRTUALITY(ID, NAME)                                         \
-  .Case("DW_VIRTUALITY_" #NAME, DW_VIRTUALITY_##NAME)
-#include "llvm/Support/Dwarf.def"
-      .Default(DW_VIRTUALITY_invalid);
-}
-
-StringRef llvm::dwarf::LanguageString(unsigned Language) {
-  switch (Language) {
-  default:
-    return StringRef();
-#define HANDLE_DW_LANG(ID, NAME, VERSION, VENDOR)                              \
-  case DW_LANG_##NAME:                                                         \
-    return "DW_LANG_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::getLanguage(StringRef LanguageString) {
-  return StringSwitch<unsigned>(LanguageString)
-#define HANDLE_DW_LANG(ID, NAME, VERSION, VENDOR)                              \
-  .Case("DW_LANG_" #NAME, DW_LANG_##NAME)
-#include "llvm/Support/Dwarf.def"
-      .Default(0);
-}
-
-unsigned llvm::dwarf::LanguageVersion(dwarf::SourceLanguage Lang) {
-  switch (Lang) {
-  default:
-    return 0;
-#define HANDLE_DW_LANG(ID, NAME, VERSION, VENDOR)                              \
-  case DW_LANG_##NAME:                                                         \
-    return VERSION;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::LanguageVendor(dwarf::SourceLanguage Lang) {
-  switch (Lang) {
-  default:
-    return 0;
-#define HANDLE_DW_LANG(ID, NAME, VERSION, VENDOR)                              \
-  case DW_LANG_##NAME:                                                         \
-    return DWARF_VENDOR_##VENDOR;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::CaseString(unsigned Case) {
-  switch (Case) {
-  case DW_ID_case_sensitive:             return "DW_ID_case_sensitive";
-  case DW_ID_up_case:                    return "DW_ID_up_case";
-  case DW_ID_down_case:                  return "DW_ID_down_case";
-  case DW_ID_case_insensitive:           return "DW_ID_case_insensitive";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::ConventionString(unsigned CC) {
-  switch (CC) {
-  default:
-    return StringRef();
-#define HANDLE_DW_CC(ID, NAME)                                               \
-  case DW_CC_##NAME:                                                         \
-    return "DW_CC_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-unsigned llvm::dwarf::getCallingConvention(StringRef CCString) {
-  return StringSwitch<unsigned>(CCString)
-#define HANDLE_DW_CC(ID, NAME) .Case("DW_CC_" #NAME, DW_CC_##NAME)
-#include "llvm/Support/Dwarf.def"
-      .Default(0);
-}
-
-StringRef llvm::dwarf::InlineCodeString(unsigned Code) {
-  switch (Code) {
-  case DW_INL_not_inlined:               return "DW_INL_not_inlined";
-  case DW_INL_inlined:                   return "DW_INL_inlined";
-  case DW_INL_declared_not_inlined:      return "DW_INL_declared_not_inlined";
-  case DW_INL_declared_inlined:          return "DW_INL_declared_inlined";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::ArrayOrderString(unsigned Order) {
-  switch (Order) {
-  case DW_ORD_row_major:                 return "DW_ORD_row_major";
-  case DW_ORD_col_major:                 return "DW_ORD_col_major";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::DiscriminantString(unsigned Discriminant) {
-  switch (Discriminant) {
-  case DW_DSC_label:                     return "DW_DSC_label";
-  case DW_DSC_range:                     return "DW_DSC_range";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::LNStandardString(unsigned Standard) {
-  switch (Standard) {
-  default:
-    return StringRef();
-#define HANDLE_DW_LNS(ID, NAME)                                               \
-  case DW_LNS_##NAME:                                                         \
-    return "DW_LNS_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::LNExtendedString(unsigned Encoding) {
-  switch (Encoding) {
-  default:
-    return StringRef();
-#define HANDLE_DW_LNE(ID, NAME)                                               \
-  case DW_LNE_##NAME:                                                         \
-    return "DW_LNE_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::MacinfoString(unsigned Encoding) {
-  switch (Encoding) {
-  // Macinfo Type Encodings
-  case DW_MACINFO_define:                return "DW_MACINFO_define";
-  case DW_MACINFO_undef:                 return "DW_MACINFO_undef";
-  case DW_MACINFO_start_file:            return "DW_MACINFO_start_file";
-  case DW_MACINFO_end_file:              return "DW_MACINFO_end_file";
-  case DW_MACINFO_vendor_ext:            return "DW_MACINFO_vendor_ext";
-  case DW_MACINFO_invalid:               return "DW_MACINFO_invalid";
-  }
-  return StringRef();
-}
-
-unsigned llvm::dwarf::getMacinfo(StringRef MacinfoString) {
-  return StringSwitch<unsigned>(MacinfoString)
-      .Case("DW_MACINFO_define", DW_MACINFO_define)
-      .Case("DW_MACINFO_undef", DW_MACINFO_undef)
-      .Case("DW_MACINFO_start_file", DW_MACINFO_start_file)
-      .Case("DW_MACINFO_end_file", DW_MACINFO_end_file)
-      .Case("DW_MACINFO_vendor_ext", DW_MACINFO_vendor_ext)
-      .Default(DW_MACINFO_invalid);
-}
-
-StringRef llvm::dwarf::CallFrameString(unsigned Encoding) {
-  switch (Encoding) {
-  default:
-    return StringRef();
-#define HANDLE_DW_CFA(ID, NAME)                                               \
-  case DW_CFA_##NAME:                                                         \
-    return "DW_CFA_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::ApplePropertyString(unsigned Prop) {
-  switch (Prop) {
-  default:
-    return StringRef();
-#define HANDLE_DW_APPLE_PROPERTY(ID, NAME)                                               \
-  case DW_APPLE_PROPERTY_##NAME:                                                         \
-    return "DW_APPLE_PROPERTY_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::UnitTypeString(unsigned UT) {
-  switch (UT) {
-  default:
-    return StringRef();
-#define HANDLE_DW_UT(ID, NAME)                                                 \
-  case DW_UT_##NAME:                                                           \
-    return "DW_UT_" #NAME;
-#include "llvm/Support/Dwarf.def"
-  }
-}
-
-StringRef llvm::dwarf::AtomTypeString(unsigned AT) {
-  switch (AT) {
-  case dwarf::DW_ATOM_null:
-    return "DW_ATOM_null";
-  case dwarf::DW_ATOM_die_offset:
-    return "DW_ATOM_die_offset";
-  case DW_ATOM_cu_offset:
-    return "DW_ATOM_cu_offset";
-  case DW_ATOM_die_tag:
-    return "DW_ATOM_die_tag";
-  case DW_ATOM_type_flags:
-    return "DW_ATOM_type_flags";
-  }
-  return StringRef();
-}
-
-StringRef llvm::dwarf::GDBIndexEntryKindString(GDBIndexEntryKind Kind) {
-  switch (Kind) {
-  case GIEK_NONE:
-    return "NONE";
-  case GIEK_TYPE:
-    return "TYPE";
-  case GIEK_VARIABLE:
-    return "VARIABLE";
-  case GIEK_FUNCTION:
-    return "FUNCTION";
-  case GIEK_OTHER:
-    return "OTHER";
-  case GIEK_UNUSED5:
-    return "UNUSED5";
-  case GIEK_UNUSED6:
-    return "UNUSED6";
-  case GIEK_UNUSED7:
-    return "UNUSED7";
-  }
-  llvm_unreachable("Unknown GDBIndexEntryKind value");
-}
-
-StringRef
-llvm::dwarf::GDBIndexEntryLinkageString(GDBIndexEntryLinkage Linkage) {
-  switch (Linkage) {
-  case GIEL_EXTERNAL:
-    return "EXTERNAL";
-  case GIEL_STATIC:
-    return "STATIC";
-  }
-  llvm_unreachable("Unknown GDBIndexEntryLinkage value");
-}
-
-StringRef llvm::dwarf::AttributeValueString(uint16_t Attr, unsigned Val) {
-  switch (Attr) {
-  case DW_AT_accessibility:
-    return AccessibilityString(Val);
-  case DW_AT_virtuality:
-    return VirtualityString(Val);
-  case DW_AT_language:
-    return LanguageString(Val);
-  case DW_AT_encoding:
-    return AttributeEncodingString(Val);
-  case DW_AT_decimal_sign:
-    return DecimalSignString(Val);
-  case DW_AT_endianity:
-    return EndianityString(Val);
-  case DW_AT_visibility:
-    return VisibilityString(Val);
-  case DW_AT_identifier_case:
-    return CaseString(Val);
-  case DW_AT_calling_convention:
-    return ConventionString(Val);
-  case DW_AT_inline:
-    return InlineCodeString(Val);
-  case DW_AT_ordering:
-    return ArrayOrderString(Val);
-  case DW_AT_discr_value:
-    return DiscriminantString(Val);
-  }
-
-  return StringRef();
-}
-
-bool llvm::dwarf::isValidFormForVersion(Form F, unsigned Version,
-                                        bool ExtensionsOk) {
-  if (FormVendor(F) == DWARF_VENDOR_DWARF) {
-    unsigned FV = FormVersion(F);
-    return FV > 0 && FV <= Version;
-  }
-  return ExtensionsOk;
-}
diff --git a/llvm/lib/Support/Path.cpp b/llvm/lib/Support/Path.cpp
index 80bef558258..e58f856ca24 100644
--- a/llvm/lib/Support/Path.cpp
+++ b/llvm/lib/Support/Path.cpp
@@ -13,12 +13,12 @@
 
 #include "llvm/Support/Path.h"
 #include "llvm/ADT/ArrayRef.h"
-#include "llvm/Support/COFF.h"
+#include "llvm/BinaryFormat/COFF.h"
+#include "llvm/BinaryFormat/MachO.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/Errc.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
-#include "llvm/Support/MachO.h"
 #include "llvm/Support/Process.h"
 #include <cctype>
 #include <cstring>
@@ -1027,178 +1027,6 @@ void directory_entry::replace_filename(const Twine &filename, file_status st) {
   Status = st;
 }
 
-template <size_t N>
-static bool startswith(StringRef Magic, const char (&S)[N]) {
-  return Magic.startswith(StringRef(S, N - 1));
-}
-
-/// @brief Identify the magic in magic.
-file_magic identify_magic(StringRef Magic) {
-  if (Magic.size() < 4)
-    return file_magic::unknown;
-  switch ((unsigned char)Magic[0]) {
-    case 0x00: {
-      // COFF bigobj, CL.exe's LTO object file, or short import library file
-      if (startswith(Magic, "\0\0\xFF\xFF")) {
-        size_t MinSize = offsetof(COFF::BigObjHeader, UUID) + sizeof(COFF::BigObjMagic);
-        if (Magic.size() < MinSize)
-          return file_magic::coff_import_library;
-
-        const char *Start = Magic.data() + offsetof(COFF::BigObjHeader, UUID);
-        if (memcmp(Start, COFF::BigObjMagic, sizeof(COFF::BigObjMagic)) == 0)
-          return file_magic::coff_object;
-        if (memcmp(Start, COFF::ClGlObjMagic, sizeof(COFF::BigObjMagic)) == 0)
-          return file_magic::coff_cl_gl_object;
-        return file_magic::coff_import_library;
-      }
-      // Windows resource file
-      if (startswith(Magic, "\0\0\0\0\x20\0\0\0\xFF"))
-        return file_magic::windows_resource;
-      // 0x0000 = COFF unknown machine type
-      if (Magic[1] == 0)
-        return file_magic::coff_object;
-      if (startswith(Magic, "\0asm"))
-        return file_magic::wasm_object;
-      break;
-    }
-    case 0xDE:  // 0x0B17C0DE = BC wraper
-      if (startswith(Magic, "\xDE\xC0\x17\x0B"))
-        return file_magic::bitcode;
-      break;
-    case 'B':
-      if (startswith(Magic, "BC\xC0\xDE"))
-        return file_magic::bitcode;
-      break;
-    case '!':
-      if (startswith(Magic, "!<arch>\n") || startswith(Magic, "!<thin>\n"))
-        return file_magic::archive;
-      break;
-
-    case '\177':
-      if (startswith(Magic, "\177ELF") && Magic.size() >= 18) {
-        bool Data2MSB = Magic[5] == 2;
-        unsigned high = Data2MSB ? 16 : 17;
-        unsigned low  = Data2MSB ? 17 : 16;
-        if (Magic[high] == 0) {
-          switch (Magic[low]) {
-            default: return file_magic::elf;
-            case 1: return file_magic::elf_relocatable;
-            case 2: return file_magic::elf_executable;
-            case 3: return file_magic::elf_shared_object;
-            case 4: return file_magic::elf_core;
-          }
-        }
-        // It's still some type of ELF file.
-        return file_magic::elf;
-      }
-      break;
-
-    case 0xCA:
-      if (startswith(Magic, "\xCA\xFE\xBA\xBE") ||
-          startswith(Magic, "\xCA\xFE\xBA\xBF")) {
-        // This is complicated by an overlap with Java class files.
-        // See the Mach-O section in /usr/share/file/magic for details.
-        if (Magic.size() >= 8 && Magic[7] < 43)
-          return file_magic::macho_universal_binary;
-      }
-      break;
-
-      // The two magic numbers for mach-o are:
-      // 0xfeedface - 32-bit mach-o
-      // 0xfeedfacf - 64-bit mach-o
-    case 0xFE:
-    case 0xCE:
-    case 0xCF: {
-      uint16_t type = 0;
-      if (startswith(Magic, "\xFE\xED\xFA\xCE") ||
-          startswith(Magic, "\xFE\xED\xFA\xCF")) {
-        /* Native endian */
-        size_t MinSize;
-        if (Magic[3] == char(0xCE))
-          MinSize = sizeof(MachO::mach_header);
-        else
-          MinSize = sizeof(MachO::mach_header_64);
-        if (Magic.size() >= MinSize)
-          type = Magic[12] << 24 | Magic[13] << 12 | Magic[14] << 8 | Magic[15];
-      } else if (startswith(Magic, "\xCE\xFA\xED\xFE") ||
-                 startswith(Magic, "\xCF\xFA\xED\xFE")) {
-        /* Reverse endian */
-        size_t MinSize;
-        if (Magic[0] == char(0xCE))
-          MinSize = sizeof(MachO::mach_header);
-        else
-          MinSize = sizeof(MachO::mach_header_64);
-        if (Magic.size() >= MinSize)
-          type = Magic[15] << 24 | Magic[14] << 12 |Magic[13] << 8 | Magic[12];
-      }
-      switch (type) {
-        default: break;
-        case 1: return file_magic::macho_object;
-        case 2: return file_magic::macho_executable;
-        case 3: return file_magic::macho_fixed_virtual_memory_shared_lib;
-        case 4: return file_magic::macho_core;
-        case 5: return file_magic::macho_preload_executable;
-        case 6: return file_magic::macho_dynamically_linked_shared_lib;
-        case 7: return file_magic::macho_dynamic_linker;
-        case 8: return file_magic::macho_bundle;
-        case 9: return file_magic::macho_dynamically_linked_shared_lib_stub;
-        case 10: return file_magic::macho_dsym_companion;
-        case 11: return file_magic::macho_kext_bundle;
-      }
-      break;
-    }
-    case 0xF0: // PowerPC Windows
-    case 0x83: // Alpha 32-bit
-    case 0x84: // Alpha 64-bit
-    case 0x66: // MPS R4000 Windows
-    case 0x50: // mc68K
-    case 0x4c: // 80386 Windows
-    case 0xc4: // ARMNT Windows
-      if (Magic[1] == 0x01)
-        return file_magic::coff_object;
-      LLVM_FALLTHROUGH;
-
-    case 0x90: // PA-RISC Windows
-    case 0x68: // mc68K Windows
-      if (Magic[1] == 0x02)
-        return file_magic::coff_object;
-      break;
-
-    case 'M': // Possible MS-DOS stub on Windows PE file
-      if (startswith(Magic, "MZ")) {
-        uint32_t off = read32le(Magic.data() + 0x3c);
-        // PE/COFF file, either EXE or DLL.
-        if (off < Magic.size() &&
-            memcmp(Magic.data()+off, COFF::PEMagic, sizeof(COFF::PEMagic)) == 0)
-          return file_magic::pecoff_executable;
-      }
-      break;
-
-    case 0x64: // x86-64 Windows.
-      if (Magic[1] == char(0x86))
-        return file_magic::coff_object;
-      break;
-
-    default:
-      break;
-  }
-  return file_magic::unknown;
-}
-
-std::error_code identify_magic(const Twine &Path, file_magic &Result) {
-  int FD;
-  if (std::error_code EC = openFileForRead(Path, FD))
-    return EC;
-
-  char Buffer[32];
-  int Length = read(FD, Buffer, sizeof(Buffer));
-  if (close(FD) != 0 || Length < 0)
-    return std::error_code(errno, std::generic_category());
-
-  Result = identify_magic(StringRef(Buffer, Length));
-  return std::error_code();
-}
-
 std::error_code directory_entry::status(file_status &result) const {
   return fs::status(Path, result, FollowSymlinks);
 }