llvm-readobj: Print GNU style program headers

[khemant]

Summary

Terach llvm-readobj to print readelf equivalent of:
readelf -lW

[khemant]

test/tools/llvm-readobj/Inputs/phdrs-elf.exe-* files are checked in as Binary as they are fully formed executables. They also have sufficient mix of program headers which have TLS sections in permissible segments and some extra non PT_LOAD segments.

test/tools/llvm-readobj/gnu-phdrs.test

2

Forgot to add the source used to compile the binary. Will add it in a new patch.

[khemant]

Updated test.

[echristo]

Now that the general structure is there as long as you're following it I'm fine with anything you fill in to be post-commit reviewed.

Thanks!

-eric

test/tools/llvm-readobj/gnu-phdrs.test

+#Source :
+#__thread int a = 1;
+#__thread int b;
+#
+#int main () {
+#  b = 2;
+#  throw (a + b) ;
+#  return 0;
+#}
+# compiled as clang++ source.cpp
+# and  clang++ -m32 source.cpp
+
+RUN: llvm-readobj -program-headers %p/Inputs/phdrs-elf.exe-i386 --elf-output-style=GNU \
+RUN:   | FileCheck %s -check-prefix ELF32
+RUN: llvm-readobj -program-headers %p/Inputs/phdrs-elf.exe-x86_64 \
+RUN:  --elf-output-style=GNU | FileCheck %s -check-prefix ELF64
+
+ELF32: Elf file type is EXEC (Executable file)
+ELF32-NEXT: Entry point 0x8048460
+ELF32-NEXT: There are 10 program headers, starting at Offsetset 52
+ELF32: Program Headers:
+ELF32-NEXT:   Type           Offset   VirtAddr   PhysAddr   FileSiz  MemSiz   Flg Align
+ELF32-NEXT:   PHDR           0x000034 0x8048034  0x8048034  0x000140 0x000140 R E 0x4
+ELF32-NEXT:   INTERP         0x000174 0x8048174  0x8048174  0x000013 0x000013 R   0x1
+ELF32-NEXT:       [Requesting program interpreter: /lib/ld-linux.so.2]
+ELF32-NEXT:   LOAD           0x000000 0x8048000  0x8048000  0x0006d0 0x0006d0 R E 0x1000
+ELF32-NEXT:   LOAD           0x000ef0 0x8049ef0  0x8049ef0  0x000128 0x000140 RW  0x1000
+ELF32-NEXT:   DYNAMIC        0x000f08 0x8049f08  0x8049f08  0x0000e8 0x0000e8 RW  0x4
+ELF32-NEXT:   NOTE           0x000188 0x8048188  0x8048188  0x000044 0x000044 R   0x4
+ELF32-NEXT:   TLS            0x000ef0 0x8049ef0  0x8049ef0  0x000004 0x000008 R   0x4
+ELF32-NEXT:   GNU_EH_FRAME   0x000640 0x8048640  0x8048640  0x00001c 0x00001c R   0x4
+ELF32-NEXT:   GNU_STACK      0x000000 0x000000   0x000000   0x000000 0x000000 RW  0x4
+ELF32-NEXT:   GNU_RELRO      0x000ef0 0x8049ef0  0x8049ef0  0x000110 0x000110 R   0x1
+
+ELF32: Section to Segment mapping:
+ELF32-NEXT:   Segment Sections...
+ELF32-NEXT:     0
+ELF32-NEXT:     1     .interp
+ELF32-NEXT:     2     .interp .note.ABI-tag .note.gnu.build-id .hash .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rel.dyn .rel.plt .init .plt .text .fini .rodata .eh_frame_hdr .eh_frame
+ELF32-NEXT:     3     .tdata .ctors .dtors .jcr .dynamic .got .got.plt .data .bss
+ELF32-NEXT:     4     .dynamic
+ELF32-NEXT:     5     .note.ABI-tag .note.gnu.build-id
+ELF32-NEXT:     6     .tdata .tbss
+ELF32-NEXT:     7     .eh_frame_hdr
+ELF32-NEXT:     8
+ELF32-NEXT:     9     .tdata .ctors .dtors .jcr .dynamic .got 
+
+ELF64: Elf file type is EXEC (Executable file)
+ELF64-NEXT: Entry point 0x400610
+ELF64-NEXT: There are 10 program headers, starting at Offsetset 64
+
+ELF64: Program Headers:
+ELF64-NEXT:   Type           Offset   VirtAddr           PhysAddr         FileSiz  MemSiz   Flg Align
+ELF64-NEXT:   PHDR           0x000040 0x00000000400040   0x00000000400040 0x000230 0x000230 R E 0x8
+ELF64-NEXT:   INTERP         0x000270 0x00000000400270   0x00000000400270 0x00001c 0x00001c R   0x1
+ELF64-NEXT:       [Requesting program interpreter: /lib64/ld-linux-x86-64.so.2]
+ELF64-NEXT:   LOAD           0x000000 0x00000000400000   0x00000000400000 0x000924 0x000924 R E 0x200000
+ELF64-NEXT:   LOAD           0x000db4 0x00000000600db4   0x00000000600db4 0x000274 0x0002a4 RW  0x200000
+ELF64-NEXT:   DYNAMIC        0x000dd0 0x00000000600dd0   0x00000000600dd0 0x000210 0x000210 RW  0x8
+ELF64-NEXT:   NOTE           0x00028c 0x0000000040028c   0x0000000040028c 0x000044 0x000044 R   0x4
+ELF64-NEXT:   TLS            0x000db4 0x00000000600db4   0x00000000600db4 0x000004 0x000008 R   0x4
+ELF64-NEXT:   GNU_EH_FRAME   0x00083c 0x0000000040083c   0x0000000040083c 0x00002c 0x00002c R   0x4
+ELF64-NEXT:   GNU_STACK      0x000000 0x00000000000000   0x00000000000000 0x000000 0x000000 RW  0x8
+ELF64-NEXT:   GNU_RELRO      0x000db4 0x00000000600db4   0x00000000600db4 0x00024c 0x00024c R   0x1
+
+ELF64:  Section to Segment mapping:
+ELF64-NEXT:   Segment Sections...
+ELF64-NEXT:     0
+ELF64-NEXT:     1     .interp
+ELF64-NEXT:     2     .interp .note.ABI-tag .note.gnu.build-id .hash .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.dyn .rela.plt .init .plt .text .fini .rodata .eh_frame_hdr .eh_frame
+ELF64-NEXT:     3     .tdata .init_array .fini_array .jcr .dynamic .got .got.plt .data .bss
+ELF64-NEXT:     4     .dynamic
+ELF64-NEXT:     5     .note.ABI-tag .note.gnu.build-id
+ELF64-NEXT:     6     .tdata .tbss
+ELF64-NEXT:     7     .eh_frame_hdr
+ELF64-NEXT:     8
+ELF64-NEXT:     9     .tdata .init_array .fini_array .jcr .dynamic .got

tools/llvm-readobj/ELFDumper.cpp

public:
   virtual void printDynamicRelocations(const ELFFile<ELFT> *Obj) = 0;
   virtual void printSymtabMessage(const ELFFile<ELFT> *obj, StringRef Name,
                                   size_t Offset) {
     return;
   }
   virtual void printSymbol(const ELFFile<ELFT> *Obj, const Elf_Sym *Symbol,
                            const Elf_Sym *FirstSym, StringRef StrTable,
                            bool IsDynamic) = 0;
+  virtual void printProgramHeaders(const ELFFile<ELFT> *Obj) = 0;
   const ELFDumper<ELFT> *dumper() const { return Dumper; }
 private:
   const ELFDumper<ELFT> *Dumper;
 };
 
 template <typename ELFT> class GNUStyle : public DumpStyle<ELFT> {
   formatted_raw_ostream OS;
 public:
   TYPEDEF_ELF_TYPES(ELFT)
   GNUStyle(StreamWriter &W, ELFDumper<ELFT> *Dumper)
       : DumpStyle<ELFT>(Dumper), OS(W.getOStream()) {}
   void printFileHeaders(const ELFO *Obj) override;
   void printGroupSections(const ELFFile<ELFT> *Obj) override;
   void printRelocations(const ELFO *Obj) override;
   void printSections(const ELFO *Obj) override;
   void printSymbols(const ELFO *Obj) override;
   void printDynamicSymbols(const ELFO *Obj) override;
   void printDynamicRelocations(const ELFO *Obj) override;
   virtual void printSymtabMessage(const ELFO *Obj, StringRef Name,
                                   size_t Offset) override;
+  void printProgramHeaders(const ELFO *Obj) override;
 
 private:
   struct Field {
     StringRef Str;
     unsigned Column;
     Field(StringRef S, unsigned Col) : Str(S), Column(Col) {}
     Field(unsigned Col) : Str(""), Column(Col) {}
   };
formatted_raw_ostream &printField(struct Field F) {
     return OS;
   }
   void printRelocation(const ELFO *Obj, const Elf_Shdr *SymTab,
                        const Elf_Rela &R, bool IsRela);
   void printSymbol(const ELFO *Obj, const Elf_Sym *Symbol, const Elf_Sym *First,
                    StringRef StrTable, bool IsDynamic) override;
   std::string getSymbolSectionNdx(const ELFO *Obj, const Elf_Sym *Symbol,
                                   const Elf_Sym *FirstSym);
+  bool checkTLSSections(const Elf_Phdr &Phdr, const Elf_Shdr &Sec);
+  bool checkoffsets(const Elf_Phdr &Phdr, const Elf_Shdr &Sec);
+  bool checkVMA(const Elf_Phdr &Phdr, const Elf_Shdr &Sec);
+  bool checkPTDynamic(const Elf_Phdr &Phdr, const Elf_Shdr &Sec);
 };
 
 template <typename ELFT> class LLVMStyle : public DumpStyle<ELFT> {
 public:
   TYPEDEF_ELF_TYPES(ELFT)
   LLVMStyle(StreamWriter &W, ELFDumper<ELFT> *Dumper)
       : DumpStyle<ELFT>(Dumper), W(W) {}
 
   void printFileHeaders(const ELFO *Obj) override;
   void printGroupSections(const ELFFile<ELFT> *Obj) override;
   void printRelocations(const ELFO *Obj) override;
   void printRelocations(const Elf_Shdr *Sec, const ELFO *Obj);
   void printSections(const ELFO *Obj) override;
   void printSymbols(const ELFO *Obj) override;
   void printDynamicSymbols(const ELFO *Obj) override;
   void printDynamicRelocations(const ELFO *Obj) override;
+  void printProgramHeaders(const ELFO *Obj) override;
 
 private:
   void printRelocation(const ELFO *Obj, Elf_Rela Rel, const Elf_Shdr *SymTab);
   void printDynamicRelocation(const ELFO *Obj, Elf_Rela Rel);
   void printSymbol(const ELFO *Obj, const Elf_Sym *Symbol, const Elf_Sym *First,
                    StringRef StrTable, bool IsDynamic) override;
   StreamWriter &W;
 };
static const char *getElfSegmentType(unsigned Arch, unsigned Type) {
   LLVM_READOBJ_ENUM_CASE(ELF, PT_SUNW_UNWIND);
 
   LLVM_READOBJ_ENUM_CASE(ELF, PT_GNU_STACK);
   LLVM_READOBJ_ENUM_CASE(ELF, PT_GNU_RELRO);
   default: return "";
   }
 }
 
+static std::string getElfPtType(unsigned Arch, unsigned Type) {
+  switch (Type) {
+  case ELF::PT_NULL:
+    return "NULL";
+  case ELF::PT_LOAD:
+    return "LOAD";
+  case ELF::PT_DYNAMIC:
+    return "DYNAMIC";
+  case ELF::PT_INTERP:
+    return "INTERP";
+  case ELF::PT_NOTE:
+    return "NOTE";
+  case ELF::PT_SHLIB:
+    return "SHLIB";
+  case ELF::PT_PHDR:
+    return "PHDR";
+  case ELF::PT_TLS:
+    return "TLS";
+  case ELF::PT_GNU_EH_FRAME:
+    return "GNU_EH_FRAME";
+  case ELF::PT_SUNW_UNWIND:
+    return "SUNW_UNWIND";
+  case ELF::PT_GNU_STACK:
+    return "GNU_STACK";
+  case ELF::PT_GNU_RELRO:
+    return "GNU_RELRO";
+  default:
+    // All machine specific PT_* types
+    switch (Arch) {
+    case ELF::EM_AMDGPU:
+      switch (Type) {
+        LLVM_READOBJ_ENUM_CASE(ELF, PT_AMDGPU_HSA_LOAD_GLOBAL_PROGRAM);
+        LLVM_READOBJ_ENUM_CASE(ELF, PT_AMDGPU_HSA_LOAD_GLOBAL_AGENT);
+        LLVM_READOBJ_ENUM_CASE(ELF, PT_AMDGPU_HSA_LOAD_READONLY_AGENT);
+        LLVM_READOBJ_ENUM_CASE(ELF, PT_AMDGPU_HSA_LOAD_CODE_AGENT);
+      }
+      return "";
+    case ELF::EM_ARM:
+      if (Type == ELF::PT_ARM_EXIDX)
+        return "EXIDX";
+      return "";
+    case ELF::EM_MIPS:
+    case ELF::EM_MIPS_RS3_LE:
+      switch (Type) {
+      case PT_MIPS_REGINFO:
+        return "REGINFO";
+      case PT_MIPS_RTPROC:
+        return "RTPROC";
+      case PT_MIPS_OPTIONS:
+        return "OPTIONS";
+      case PT_MIPS_ABIFLAGS:
+        return "ABIFLAGS";
+      }
+      return "";
+    }
+  }
+  return std::string("<unknown>: ") + to_string(format_hex(Type, 1));
+}
+
 static const EnumEntry<unsigned> ElfSegmentFlags[] = {
   LLVM_READOBJ_ENUM_ENT(ELF, PF_X),
   LLVM_READOBJ_ENUM_ENT(ELF, PF_W),
   LLVM_READOBJ_ENUM_ENT(ELF, PF_R)
 };
 
 static const EnumEntry<unsigned> ElfHeaderMipsFlags[] = {
   LLVM_READOBJ_ENUM_ENT(ELF, EF_MIPS_NOREORDER),
void ELFDumper<ELFT>::printSections() {
   ELFDumperStyle->printSections(Obj);
 }
 
 template<class ELFT>
 void ELFDumper<ELFT>::printRelocations() {
   ELFDumperStyle->printRelocations(Obj);
 }
 
+template <class ELFT> void ELFDumper<ELFT>::printProgramHeaders() {
+  ELFDumperStyle->printProgramHeaders(Obj);
+}
+
 template <class ELFT> void ELFDumper<ELFT>::printDynamicRelocations() {
   ELFDumperStyle->printDynamicRelocations(Obj);
 }
 
-
 template<class ELFT>
 void ELFDumper<ELFT>::printSymbols() {
   ELFDumperStyle->printSymbols(Obj);
 }
 
 template<class ELFT>
 void ELFDumper<ELFT>::printDynamicSymbols() {
   ELFDumperStyle->printDynamicSymbols(Obj);
 }
 
-
 #define LLVM_READOBJ_TYPE_CASE(name) \
   case DT_##name: return #name
 
 static const char *getTypeString(uint64_t Type) {
   switch (Type) {
   LLVM_READOBJ_TYPE_CASE(BIND_NOW);
   LLVM_READOBJ_TYPE_CASE(DEBUG);
   LLVM_READOBJ_TYPE_CASE(FINI);
void ELFDumper<ELFT>::printNeededLibraries() {
 
   std::stable_sort(Libs.begin(), Libs.end());
 
   for (const auto &L : Libs) {
     outs() << "  " << L << "\n";
   }
 }
 
-template<class ELFT>
-void ELFDumper<ELFT>::printProgramHeaders() {
-  ListScope L(W, "ProgramHeaders");
-
-  for (const Elf_Phdr &Phdr : Obj->program_headers()) {
-    DictScope P(W, "ProgramHeader");
-    W.printHex("Type",
-               getElfSegmentType(Obj->getHeader()->e_machine, Phdr.p_type),
-               Phdr.p_type);
-    W.printHex("Offset", Phdr.p_offset);
-    W.printHex("VirtualAddress", Phdr.p_vaddr);
-    W.printHex("PhysicalAddress", Phdr.p_paddr);
-    W.printNumber("FileSize", Phdr.p_filesz);
-    W.printNumber("MemSize", Phdr.p_memsz);
-    W.printFlags("Flags", Phdr.p_flags, makeArrayRef(ElfSegmentFlags));
-    W.printNumber("Alignment", Phdr.p_align);
-  }
-}
 
 template <typename ELFT>
 void ELFDumper<ELFT>::printHashTable() {
   DictScope D(W, "HashTable");
   if (!HashTable)
     return;
   W.printNumber("Num Buckets", HashTable->nbucket);
   W.printNumber("Num Chains", HashTable->nchain);
template <class ELFT> void GNUStyle<ELFT>::printSymbols(const ELFO *Obj) {
   this->dumper()->printSymbolsHelper(false);
 }
 
 template <class ELFT>
 void GNUStyle<ELFT>::printDynamicSymbols(const ELFO *Obj) {
   this->dumper()->printSymbolsHelper(true);
 }
 
+static inline std::string printPhdrFlags(unsigned Flag) {
+  std::string Str;
+  Str = (Flag & PF_R) ? "R" : " ";
+  Str += (Flag & PF_W) ? "W" : " ";
+  Str += (Flag & PF_X) ? "E" : " ";
+  return Str;
+}
+
+// SHF_TLS sections are only in PT_TLS, PT_LOAD or PT_GNU_RELRO
+// PT_TLS must only have SHF_TLS sections
+template <class ELFT>
+bool GNUStyle<ELFT>::checkTLSSections(const Elf_Phdr &Phdr,
+                                      const Elf_Shdr &Sec) {
+  return (((Sec.sh_flags & ELF::SHF_TLS) &&
+           ((Phdr.p_type == ELF::PT_TLS) || (Phdr.p_type == ELF::PT_LOAD) ||
+            (Phdr.p_type == ELF::PT_GNU_RELRO))) ||
+          (!(Sec.sh_flags & ELF::SHF_TLS) && Phdr.p_type != ELF::PT_TLS));
+}
+
+// Non-SHT_NOBITS must have its offset inside the segment
+// Only non-zero section can be at end of segment
+template <class ELFT>
+bool GNUStyle<ELFT>::checkoffsets(const Elf_Phdr &Phdr, const Elf_Shdr &Sec) {
+  if (Sec.sh_type == ELF::SHT_NOBITS)
+    return true;
+  bool IsSpecial =
+      (Sec.sh_type == ELF::SHT_NOBITS) && ((Sec.sh_flags & ELF::SHF_TLS) != 0);
+  // .tbss is special, it only has memory in PT_TLS and has NOBITS properties
+  auto SectionSize =
+      (IsSpecial && Phdr.p_type != ELF::PT_TLS) ? 0 : Sec.sh_size;
+  if (Sec.sh_offset >= Phdr.p_offset)
+    return ((Sec.sh_offset + SectionSize <= Phdr.p_filesz + Phdr.p_offset)
+            /*only non-zero sized sections at end*/ &&
+            (Sec.sh_offset + 1 <= Phdr.p_offset + Phdr.p_filesz));
+  return false;
+}
+
+// SHF_ALLOC must have VMA inside segment
+// Only non-zero section can be at end of segment
+template <class ELFT>
+bool GNUStyle<ELFT>::checkVMA(const Elf_Phdr &Phdr, const Elf_Shdr &Sec) {
+  if (!(Sec.sh_flags & ELF::SHF_ALLOC))
+    return true;
+  bool IsSpecial =
+      (Sec.sh_type == ELF::SHT_NOBITS) && ((Sec.sh_flags & ELF::SHF_TLS) != 0);
+  // .tbss is special, it only has memory in PT_TLS and has NOBITS properties
+  auto SectionSize =
+      (IsSpecial && Phdr.p_type != ELF::PT_TLS) ? 0 : Sec.sh_size;
+  if (Sec.sh_addr >= Phdr.p_vaddr)
+    return ((Sec.sh_addr + SectionSize <= Phdr.p_vaddr + Phdr.p_memsz) &&
+            (Sec.sh_addr + 1 <= Phdr.p_vaddr + Phdr.p_memsz));
+  return false;
+}
+
+// No section with zero size must be at start or end of PT_DYNAMIC
+template <class ELFT>
+bool GNUStyle<ELFT>::checkPTDynamic(const Elf_Phdr &Phdr, const Elf_Shdr &Sec) {
+  if (Phdr.p_type != ELF::PT_DYNAMIC || Sec.sh_size != 0 || Phdr.p_memsz == 0)
+    return true;
+  // Is section within the phdr both based on offset and VMA ?
+  return ((Sec.sh_type == ELF::SHT_NOBITS) ||
+          (Sec.sh_offset > Phdr.p_offset &&
+           Sec.sh_offset < Phdr.p_offset + Phdr.p_filesz)) &&
+         (!(Sec.sh_flags & ELF::SHF_ALLOC) ||
+          (Sec.sh_addr > Phdr.p_vaddr && Sec.sh_addr < Phdr.p_memsz));
+}
+
+template <class ELFT>
+void GNUStyle<ELFT>::printProgramHeaders(const ELFO *Obj) {
+  int Bias = (ELFT::Is64Bits) ? 8 : 0;
+  unsigned Width = (ELFT::Is64Bits) ? 18 : 10;
+  unsigned SizeWidth = (ELFT::Is64Bits) ? 8 : 7;
+  std::string Type, Offset, VMA, LMA, FileSz, MemSz, Flag, Align;
+
+  const Elf_Ehdr *Header = Obj->getHeader();
+  Field Fields[8] = {2,         17,        26,        37 + Bias,
+                     48 + Bias, 56 + Bias, 64 + Bias, 68 + Bias};
+  OS << "\nElf file type is "
+     << printEnum(Header->e_type, makeArrayRef(ElfObjectFileType)) << "\n"
+     << "Entry point " << format_hex(Header->e_entry, 1) << "\n"
+     << "There are " << Header->e_phnum << " program headers,"
+     << " starting at offset " << Header->e_phoff << "\n\n"
+     << "Program Headers:\n";
+  if (ELFT::Is64Bits)
+    OS << "  Type           Offset   VirtAddr           PhysAddr         "
+       << "  FileSiz  MemSiz   Flg Align\n";
+  else
+    OS << "  Type           Offset   VirtAddr   PhysAddr   FileSiz "
+       << "MemSiz  Flg Align\n";
+  for (const auto &Phdr : Obj->program_headers()) {
+    Type = getElfPtType(Header->e_machine, Phdr.p_type);
+    Offset = to_string(format_hex(Phdr.p_offset, 8));
+    VMA = to_string(format_hex(Phdr.p_vaddr, Width));
+    LMA = to_string(format_hex(Phdr.p_paddr, Width));
+    FileSz = to_string(format_hex(Phdr.p_filesz, SizeWidth));
+    MemSz = to_string(format_hex(Phdr.p_memsz, SizeWidth));
+    Flag = printPhdrFlags(Phdr.p_flags);
+    Align = to_string(format_hex(Phdr.p_align, 1));
+    Fields[0].Str = Type;
+    Fields[1].Str = Offset;
+    Fields[2].Str = VMA;
+    Fields[3].Str = LMA;
+    Fields[4].Str = FileSz;
+    Fields[5].Str = MemSz;
+    Fields[6].Str = Flag;
+    Fields[7].Str = Align;
+    for (auto Field : Fields)
+      printField(Field);
+    if (Phdr.p_type == ELF::PT_INTERP) {
+      OS << "\n      [Requesting program interpreter: ";
+      OS << reinterpret_cast<const char *>(Obj->base()) + Phdr.p_offset << "]";
+    }
+    OS << "\n";
+  }
+  OS << "\n Section to Segment mapping:\n  Segment Sections...\n";
+  int Phnum = 0;
+  for (const Elf_Phdr &Phdr : Obj->program_headers()) {
+    std::string Sections;
+    OS << format("   %2.2d     ", Phnum++);
+    for (const Elf_Shdr &Sec : Obj->sections()) {
+      // Check if each section is in a segment and then print mapping.
+      // readelf additionally makes sure it does not print zero sized sections
+      // at end of segments and for PT_DYNAMIC both start and end of section
+      // .tbss must only be shown in PT_TLS section.
+      bool TbssInNonTLS = (Sec.sh_type == ELF::SHT_NOBITS) &&
+                          ((Sec.sh_flags & ELF::SHF_TLS) != 0) &&
+                          Phdr.p_type != ELF::PT_TLS;
+      if (!TbssInNonTLS && checkTLSSections(Phdr, Sec) &&
+          checkoffsets(Phdr, Sec) && checkVMA(Phdr, Sec) &&
+          checkPTDynamic(Phdr, Sec) && (Sec.sh_type != ELF::SHT_NULL))
+        Sections += unwrapOrError(Obj->getSectionName(&Sec)).str() + " ";
+    }
+    OS << Sections << "\n";
+    OS.flush();
+  }
+}
+
 template <class ELFT>
 void GNUStyle<ELFT>::printDynamicRelocations(const ELFO *Obj) {
   OS << "GNU style dynamic relocations not implemented!\n";
 }
 
 template <class ELFT> void LLVMStyle<ELFT>::printFileHeaders(const ELFO *Obj) {
   const Elf_Ehdr *e = Obj->getHeader();
   {
if (opts::ExpandRelocs) {
     W.printHex("Addend", Rel.r_addend);
   } else {
     raw_ostream &OS = W.startLine();
     OS << W.hex(Rel.r_offset) << " " << RelocName << " "
        << (SymbolName.size() > 0 ? SymbolName : "-") << " "
        << W.hex(Rel.r_addend) << "\n";
   }
 }
+
+template <class ELFT>
+void LLVMStyle<ELFT>::printProgramHeaders(const ELFO *Obj) {
+  ListScope L(W, "ProgramHeaders");
+
+  for (const Elf_Phdr &Phdr : Obj->program_headers()) {
+    DictScope P(W, "ProgramHeader");
+    W.printHex("Type",
+               getElfSegmentType(Obj->getHeader()->e_machine, Phdr.p_type),
+               Phdr.p_type);
+    W.printHex("Offset", Phdr.p_offset);
+    W.printHex("VirtualAddress", Phdr.p_vaddr);
+    W.printHex("PhysicalAddress", Phdr.p_paddr);
+    W.printNumber("FileSize", Phdr.p_filesz);
+    W.printNumber("MemSize", Phdr.p_memsz);
+    W.printFlags("Flags", Phdr.p_flags, makeArrayRef(ElfSegmentFlags));
+    W.printNumber("Alignment", Phdr.p_align);
+  }
+}