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
diff --git a/llvm/lib/BinaryFormat/CMakeLists.txt b/llvm/lib/BinaryFormat/CMakeLists.txt
new file mode 100644
index 0000000..cb78ea6
--- /dev/null
+++ b/llvm/lib/BinaryFormat/CMakeLists.txt
@@ -0,0 +1,8 @@
+add_llvm_library(LLVMBinaryFormat
+ Dwarf.cpp
+ Magic.cpp
+
+ ADDITIONAL_HEADER_DIRS
+ ${LLVM_MAIN_INCLUDE_DIR}/llvm/BinaryFormat
+ )
+
\ No newline at end of file
diff --git a/llvm/lib/BinaryFormat/Dwarf.cpp b/llvm/lib/BinaryFormat/Dwarf.cpp
new file mode 100644
index 0000000..37c4579
--- /dev/null
+++ b/llvm/lib/BinaryFormat/Dwarf.cpp
@@ -0,0 +1,577 @@
+//===-- llvm/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/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/BinaryFormat/LLVMBuild.txt b/llvm/lib/BinaryFormat/LLVMBuild.txt
new file mode 100644
index 0000000..d7d4dcb
--- /dev/null
+++ b/llvm/lib/BinaryFormat/LLVMBuild.txt
@@ -0,0 +1,22 @@
+;===- ./lib/BinaryFormat/LLVMBuild.txt -------------------------*- Conf -*--===;
+;
+; The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+; http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = BinaryFormat
+parent = Libraries
+required_libraries = Support
diff --git a/llvm/lib/BinaryFormat/Magic.cpp b/llvm/lib/BinaryFormat/Magic.cpp
new file mode 100644
index 0000000..ca4d93f
--- /dev/null
+++ b/llvm/lib/BinaryFormat/Magic.cpp
@@ -0,0 +1,216 @@
+//===- llvm/BinaryFormat/Magic.cpp - File magic identification --*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/BinaryFormat/Magic.h"
+
+#include "llvm/BinaryFormat/COFF.h"
+#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/BinaryFormat/MachO.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/FileSystem.h"
+
+#if !defined(_MSC_VER) && !defined(__MINGW32__)
+#include <unistd.h>
+#else
+#include <io.h>
+#endif
+
+using namespace llvm;
+using namespace llvm::support::endian;
+using namespace llvm::sys::fs;
+
+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 llvm::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 llvm::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();
+}