Remove dependency on llvm/Support/ELF.h by using linux's elf.h.

Change-Id: Iefe66af9958641ac7f08fdc22f438d976e5b4d54
diff --git a/compiler/elf_fixup.cc b/compiler/elf_fixup.cc
index 66c8da1..6fd4a73 100644
--- a/compiler/elf_fixup.cc
+++ b/compiler/elf_fixup.cc
@@ -16,6 +16,8 @@
 
 #include "elf_fixup.h"
 
+#include <inttypes.h>
+
 #include "base/logging.h"
 #include "base/stringprintf.h"
 #include "elf_file.h"
@@ -32,8 +34,8 @@
   CHECK(elf_file.get() != nullptr) << error_msg;
 
   // Lookup "oatdata" symbol address.
-  ::llvm::ELF::Elf32_Addr oatdata_address = ElfWriter::GetOatDataAddress(elf_file.get());
-  ::llvm::ELF::Elf32_Off base_address = oat_data_begin - oatdata_address;
+  Elf32_Addr oatdata_address = ElfWriter::GetOatDataAddress(elf_file.get());
+  Elf32_Off base_address = oat_data_begin - oatdata_address;
 
   if (!FixupDynamic(*elf_file.get(), base_address)) {
       LOG(WARNING) << "Failed fo fixup .dynamic in " << file->GetPath();
@@ -62,82 +64,65 @@
   return true;
 }
 
-// MIPS seems to break the rules d_val vs d_ptr even though their values are between DT_LOPROC and DT_HIPROC
-#define DT_MIPS_RLD_VERSION  0x70000001  // d_val
-#define DT_MIPS_TIME_STAMP   0x70000002  // d_val
-#define DT_MIPS_ICHECKSUM    0x70000003  // d_val
-#define DT_MIPS_IVERSION     0x70000004  // d_val
-#define DT_MIPS_FLAGS        0x70000005  // d_val
-#define DT_MIPS_BASE_ADDRESS 0x70000006  // d_ptr
-#define DT_MIPS_CONFLICT     0x70000008  // d_ptr
-#define DT_MIPS_LIBLIST      0x70000009  // d_ptr
-#define DT_MIPS_LOCAL_GOTNO  0x7000000A  // d_val
-#define DT_MIPS_CONFLICTNO   0x7000000B  // d_val
-#define DT_MIPS_LIBLISTNO    0x70000010  // d_val
-#define DT_MIPS_SYMTABNO     0x70000011  // d_val
-#define DT_MIPS_UNREFEXTNO   0x70000012  // d_val
-#define DT_MIPS_GOTSYM       0x70000013  // d_val
-#define DT_MIPS_HIPAGENO     0x70000014  // d_val
-#define DT_MIPS_RLD_MAP      0x70000016  // d_ptr
 
 bool ElfFixup::FixupDynamic(ElfFile& elf_file, uintptr_t base_address) {
-  for (::llvm::ELF::Elf32_Word i = 0; i < elf_file.GetDynamicNum(); i++) {
-    ::llvm::ELF::Elf32_Dyn& elf_dyn = elf_file.GetDynamic(i);
-    ::llvm::ELF::Elf32_Word d_tag = elf_dyn.d_tag;
+  for (Elf32_Word i = 0; i < elf_file.GetDynamicNum(); i++) {
+    Elf32_Dyn& elf_dyn = elf_file.GetDynamic(i);
+    Elf32_Word d_tag = elf_dyn.d_tag;
     bool elf_dyn_needs_fixup = false;
     switch (d_tag) {
       // case 1: well known d_tag values that imply Elf32_Dyn.d_un contains an address in d_ptr
-      case ::llvm::ELF::DT_PLTGOT:
-      case ::llvm::ELF::DT_HASH:
-      case ::llvm::ELF::DT_STRTAB:
-      case ::llvm::ELF::DT_SYMTAB:
-      case ::llvm::ELF::DT_RELA:
-      case ::llvm::ELF::DT_INIT:
-      case ::llvm::ELF::DT_FINI:
-      case ::llvm::ELF::DT_REL:
-      case ::llvm::ELF::DT_DEBUG:
-      case ::llvm::ELF::DT_JMPREL: {
+      case DT_PLTGOT:
+      case DT_HASH:
+      case DT_STRTAB:
+      case DT_SYMTAB:
+      case DT_RELA:
+      case DT_INIT:
+      case DT_FINI:
+      case DT_REL:
+      case DT_DEBUG:
+      case DT_JMPREL: {
         elf_dyn_needs_fixup = true;
         break;
       }
       // d_val or ignored values
-      case ::llvm::ELF::DT_NULL:
-      case ::llvm::ELF::DT_NEEDED:
-      case ::llvm::ELF::DT_PLTRELSZ:
-      case ::llvm::ELF::DT_RELASZ:
-      case ::llvm::ELF::DT_RELAENT:
-      case ::llvm::ELF::DT_STRSZ:
-      case ::llvm::ELF::DT_SYMENT:
-      case ::llvm::ELF::DT_SONAME:
-      case ::llvm::ELF::DT_RPATH:
-      case ::llvm::ELF::DT_SYMBOLIC:
-      case ::llvm::ELF::DT_RELSZ:
-      case ::llvm::ELF::DT_RELENT:
-      case ::llvm::ELF::DT_PLTREL:
-      case ::llvm::ELF::DT_TEXTREL:
-      case ::llvm::ELF::DT_BIND_NOW:
-      case ::llvm::ELF::DT_INIT_ARRAYSZ:
-      case ::llvm::ELF::DT_FINI_ARRAYSZ:
-      case ::llvm::ELF::DT_RUNPATH:
-      case ::llvm::ELF::DT_FLAGS: {
+      case DT_NULL:
+      case DT_NEEDED:
+      case DT_PLTRELSZ:
+      case DT_RELASZ:
+      case DT_RELAENT:
+      case DT_STRSZ:
+      case DT_SYMENT:
+      case DT_SONAME:
+      case DT_RPATH:
+      case DT_SYMBOLIC:
+      case DT_RELSZ:
+      case DT_RELENT:
+      case DT_PLTREL:
+      case DT_TEXTREL:
+      case DT_BIND_NOW:
+      case DT_INIT_ARRAYSZ:
+      case DT_FINI_ARRAYSZ:
+      case DT_RUNPATH:
+      case DT_FLAGS: {
         break;
       }
       // boundary values that should not be used
-      case ::llvm::ELF::DT_ENCODING:
-      case ::llvm::ELF::DT_LOOS:
-      case ::llvm::ELF::DT_HIOS:
-      case ::llvm::ELF::DT_LOPROC:
-      case ::llvm::ELF::DT_HIPROC: {
+      case DT_ENCODING:
+      case DT_LOOS:
+      case DT_HIOS:
+      case DT_LOPROC:
+      case DT_HIPROC: {
         LOG(FATAL) << "Illegal d_tag value 0x" << std::hex << d_tag;
         break;
       }
       default: {
         // case 2: "regular" DT_* ranges where even d_tag values imply an address in d_ptr
-        if ((::llvm::ELF::DT_ENCODING  < d_tag && d_tag < ::llvm::ELF::DT_LOOS)
-            || (::llvm::ELF::DT_LOOS   < d_tag && d_tag < ::llvm::ELF::DT_HIOS)
-            || (::llvm::ELF::DT_LOPROC < d_tag && d_tag < ::llvm::ELF::DT_HIPROC)) {
+        if ((DT_ENCODING  < d_tag && d_tag < DT_LOOS)
+            || (DT_LOOS   < d_tag && d_tag < DT_HIOS)
+            || (DT_LOPROC < d_tag && d_tag < DT_HIPROC)) {
           // Special case for MIPS which breaks the regular rules between DT_LOPROC and DT_HIPROC
-          if (elf_file.GetHeader().e_machine == ::llvm::ELF::EM_MIPS) {
+          if (elf_file.GetHeader().e_machine == EM_MIPS) {
             switch (d_tag) {
               case DT_MIPS_RLD_VERSION:
               case DT_MIPS_TIME_STAMP:
@@ -189,8 +174,8 @@
 }
 
 bool ElfFixup::FixupSectionHeaders(ElfFile& elf_file, uintptr_t base_address) {
-  for (::llvm::ELF::Elf32_Word i = 0; i < elf_file.GetSectionHeaderNum(); i++) {
-    ::llvm::ELF::Elf32_Shdr& sh = elf_file.GetSectionHeader(i);
+  for (Elf32_Word i = 0; i < elf_file.GetSectionHeaderNum(); i++) {
+    Elf32_Shdr& sh = elf_file.GetSectionHeader(i);
     // 0 implies that the section will not exist in the memory of the process
     if (sh.sh_addr == 0) {
       continue;
@@ -207,8 +192,8 @@
 
 bool ElfFixup::FixupProgramHeaders(ElfFile& elf_file, uintptr_t base_address) {
   // TODO: ELFObjectFile doesn't have give to Elf32_Phdr, so we do that ourselves for now.
-  for (::llvm::ELF::Elf32_Word i = 0; i < elf_file.GetProgramHeaderNum(); i++) {
-    ::llvm::ELF::Elf32_Phdr& ph = elf_file.GetProgramHeader(i);
+  for (Elf32_Word i = 0; i < elf_file.GetProgramHeaderNum(); i++) {
+    Elf32_Phdr& ph = elf_file.GetProgramHeader(i);
     CHECK_EQ(ph.p_vaddr, ph.p_paddr) << elf_file.GetFile().GetPath() << " i=" << i;
     CHECK((ph.p_align == 0) || (0 == ((ph.p_vaddr - ph.p_offset) & (ph.p_align - 1))))
             << elf_file.GetFile().GetPath() << " i=" << i;
@@ -226,16 +211,16 @@
 }
 
 bool ElfFixup::FixupSymbols(ElfFile& elf_file, uintptr_t base_address, bool dynamic) {
-  ::llvm::ELF::Elf32_Word section_type = dynamic ? ::llvm::ELF::SHT_DYNSYM : ::llvm::ELF::SHT_SYMTAB;
+  Elf32_Word section_type = dynamic ? SHT_DYNSYM : SHT_SYMTAB;
   // TODO: Unfortunate ELFObjectFile has protected symbol access, so use ElfFile
-  ::llvm::ELF::Elf32_Shdr* symbol_section = elf_file.FindSectionByType(section_type);
+  Elf32_Shdr* symbol_section = elf_file.FindSectionByType(section_type);
   if (symbol_section == NULL) {
     // file is missing optional .symtab
     CHECK(!dynamic) << elf_file.GetFile().GetPath();
     return true;
   }
   for (uint32_t i = 0; i < elf_file.GetSymbolNum(*symbol_section); i++) {
-    ::llvm::ELF::Elf32_Sym& symbol = elf_file.GetSymbol(section_type, i);
+    Elf32_Sym& symbol = elf_file.GetSymbol(section_type, i);
     if (symbol.st_value != 0) {
       if (DEBUG_FIXUP) {
         LOG(INFO) << StringPrintf("In %s moving Elf32_Sym[%d] from 0x%08x to 0x%08" PRIxPTR,
@@ -249,11 +234,11 @@
 }
 
 bool ElfFixup::FixupRelocations(ElfFile& elf_file, uintptr_t base_address) {
-  for (llvm::ELF::Elf32_Word i = 0; i < elf_file.GetSectionHeaderNum(); i++) {
-    llvm::ELF::Elf32_Shdr& sh = elf_file.GetSectionHeader(i);
-    if (sh.sh_type == llvm::ELF::SHT_REL) {
+  for (Elf32_Word i = 0; i < elf_file.GetSectionHeaderNum(); i++) {
+    Elf32_Shdr& sh = elf_file.GetSectionHeader(i);
+    if (sh.sh_type == SHT_REL) {
       for (uint32_t i = 0; i < elf_file.GetRelNum(sh); i++) {
-        llvm::ELF::Elf32_Rel& rel = elf_file.GetRel(sh, i);
+        Elf32_Rel& rel = elf_file.GetRel(sh, i);
         if (DEBUG_FIXUP) {
           LOG(INFO) << StringPrintf("In %s moving Elf32_Rel[%d] from 0x%08x to 0x%08" PRIxPTR,
                                     elf_file.GetFile().GetPath().c_str(), i,
@@ -261,9 +246,9 @@
         }
         rel.r_offset += base_address;
       }
-    } else if (sh.sh_type == llvm::ELF::SHT_RELA) {
+    } else if (sh.sh_type == SHT_RELA) {
       for (uint32_t i = 0; i < elf_file.GetRelaNum(sh); i++) {
-        llvm::ELF::Elf32_Rela& rela = elf_file.GetRela(sh, i);
+        Elf32_Rela& rela = elf_file.GetRela(sh, i);
         if (DEBUG_FIXUP) {
           LOG(INFO) << StringPrintf("In %s moving Elf32_Rela[%d] from 0x%08x to 0x%08" PRIxPTR,
                                     elf_file.GetFile().GetPath().c_str(), i,
diff --git a/compiler/elf_stripper.cc b/compiler/elf_stripper.cc
index 7ee8d3c..b8cc5c0 100644
--- a/compiler/elf_stripper.cc
+++ b/compiler/elf_stripper.cc
@@ -18,11 +18,10 @@
 
 #include <vector>
 
-#include <llvm/Support/ELF.h>
-
 #include "UniquePtr.h"
 #include "base/logging.h"
 #include "elf_file.h"
+#include "elf_utils.h"
 #include "utils.h"
 
 namespace art {
@@ -65,14 +64,14 @@
   // - truncate rest of file
   //
 
-  std::vector<llvm::ELF::Elf32_Shdr> section_headers;
-  std::vector<llvm::ELF::Elf32_Word> section_headers_original_indexes;
+  std::vector<Elf32_Shdr> section_headers;
+  std::vector<Elf32_Word> section_headers_original_indexes;
   section_headers.reserve(elf_file->GetSectionHeaderNum());
 
 
-  llvm::ELF::Elf32_Shdr& string_section = elf_file->GetSectionNameStringSection();
-  for (llvm::ELF::Elf32_Word i = 0; i < elf_file->GetSectionHeaderNum(); i++) {
-    llvm::ELF::Elf32_Shdr& sh = elf_file->GetSectionHeader(i);
+  Elf32_Shdr& string_section = elf_file->GetSectionNameStringSection();
+  for (Elf32_Word i = 0; i < elf_file->GetSectionHeaderNum(); i++) {
+    Elf32_Shdr& sh = elf_file->GetSectionHeader(i);
     const char* name = elf_file->GetString(string_section, sh.sh_name);
     if (name == NULL) {
       CHECK_EQ(0U, i);
@@ -92,10 +91,10 @@
   CHECK_EQ(section_headers.size(), section_headers_original_indexes.size());
 
   // section 0 is the NULL section, sections start at offset of first section
-  llvm::ELF::Elf32_Off offset = elf_file->GetSectionHeader(1).sh_offset;
+  Elf32_Off offset = elf_file->GetSectionHeader(1).sh_offset;
   for (size_t i = 1; i < section_headers.size(); i++) {
-    llvm::ELF::Elf32_Shdr& new_sh = section_headers[i];
-    llvm::ELF::Elf32_Shdr& old_sh = elf_file->GetSectionHeader(section_headers_original_indexes[i]);
+    Elf32_Shdr& new_sh = section_headers[i];
+    Elf32_Shdr& old_sh = elf_file->GetSectionHeader(section_headers_original_indexes[i]);
     CHECK_EQ(new_sh.sh_name, old_sh.sh_name);
     if (old_sh.sh_addralign > 1) {
       offset = RoundUp(offset, old_sh.sh_addralign);
@@ -113,8 +112,8 @@
     offset += old_sh.sh_size;
   }
 
-  llvm::ELF::Elf32_Off shoff = offset;
-  size_t section_headers_size_in_bytes = section_headers.size() * sizeof(llvm::ELF::Elf32_Shdr);
+  Elf32_Off shoff = offset;
+  size_t section_headers_size_in_bytes = section_headers.size() * sizeof(Elf32_Shdr);
   memcpy(elf_file->Begin() + offset, &section_headers[0], section_headers_size_in_bytes);
   offset += section_headers_size_in_bytes;
 
diff --git a/compiler/elf_writer.cc b/compiler/elf_writer.cc
index 0bfe4a4..ba5f1cb 100644
--- a/compiler/elf_writer.cc
+++ b/compiler/elf_writer.cc
@@ -36,10 +36,10 @@
 
 ElfWriter::~ElfWriter() {}
 
-llvm::ELF::Elf32_Addr ElfWriter::GetOatDataAddress(ElfFile* elf_file) {
-  llvm::ELF::Elf32_Addr oatdata_address = elf_file->FindSymbolAddress(llvm::ELF::SHT_DYNSYM,
-                                                                      "oatdata",
-                                                                      false);
+Elf32_Addr ElfWriter::GetOatDataAddress(ElfFile* elf_file) {
+  Elf32_Addr oatdata_address = elf_file->FindSymbolAddress(SHT_DYNSYM,
+                                                           "oatdata",
+                                                           false);
   CHECK_NE(0U, oatdata_address);
   return oatdata_address;
 }
diff --git a/compiler/elf_writer.h b/compiler/elf_writer.h
index dbc986a..99dfc56 100644
--- a/compiler/elf_writer.h
+++ b/compiler/elf_writer.h
@@ -18,14 +18,12 @@
 #define ART_COMPILER_ELF_WRITER_H_
 
 #include <stdint.h>
-
 #include <cstddef>
 #include <string>
 #include <vector>
 
-#include <llvm/Support/ELF.h>
-
 #include "base/macros.h"
+#include "elf_utils.h"
 #include "os.h"
 
 namespace art {
@@ -44,7 +42,7 @@
                                    size_t& oat_data_offset);
 
   // Returns runtime oat_data runtime address for an opened ElfFile.
-  static ::llvm::ELF::Elf32_Addr GetOatDataAddress(ElfFile* elf_file);
+  static Elf32_Addr GetOatDataAddress(ElfFile* elf_file);
 
  protected:
   ElfWriter(const CompilerDriver& driver, File* elf_file);
diff --git a/compiler/elf_writer_quick.cc b/compiler/elf_writer_quick.cc
index 04342fd..3191374 100644
--- a/compiler/elf_writer_quick.cc
+++ b/compiler/elf_writer_quick.cc
@@ -20,6 +20,7 @@
 #include "base/unix_file/fd_file.h"
 #include "buffered_output_stream.h"
 #include "driver/compiler_driver.h"
+#include "elf_utils.h"
 #include "file_output_stream.h"
 #include "globals.h"
 #include "oat.h"
@@ -117,10 +118,10 @@
   uint32_t expected_offset = 0;
 
   // Elf32_Ehdr
-  expected_offset += sizeof(llvm::ELF::Elf32_Ehdr);
+  expected_offset += sizeof(Elf32_Ehdr);
 
   // PHDR
-  uint32_t phdr_alignment = sizeof(llvm::ELF::Elf32_Word);
+  uint32_t phdr_alignment = sizeof(Elf32_Word);
   uint32_t phdr_offset = expected_offset;
   const uint8_t PH_PHDR     = 0;
   const uint8_t PH_LOAD_R__ = 1;
@@ -128,7 +129,7 @@
   const uint8_t PH_LOAD_RW_ = 3;
   const uint8_t PH_DYNAMIC  = 4;
   const uint8_t PH_NUM      = 5;
-  uint32_t phdr_size = sizeof(llvm::ELF::Elf32_Phdr) * PH_NUM;
+  uint32_t phdr_size = sizeof(Elf32_Phdr) * PH_NUM;
   expected_offset += phdr_size;
   if (debug) {
     LOG(INFO) << "phdr_offset=" << phdr_offset << std::hex << " " << phdr_offset;
@@ -136,14 +137,14 @@
   }
 
   // .dynsym
-  uint32_t dynsym_alignment = sizeof(llvm::ELF::Elf32_Word);
+  uint32_t dynsym_alignment = sizeof(Elf32_Word);
   uint32_t dynsym_offset = expected_offset = RoundUp(expected_offset, dynsym_alignment);
   const uint8_t SYM_UNDEF       = 0;  // aka STN_UNDEF
   const uint8_t SYM_OATDATA     = 1;
   const uint8_t SYM_OATEXEC     = 2;
   const uint8_t SYM_OATLASTWORD = 3;
   const uint8_t SYM_NUM         = 4;
-  uint32_t dynsym_size = sizeof(llvm::ELF::Elf32_Sym) * SYM_NUM;
+  uint32_t dynsym_size = sizeof(Elf32_Sym) * SYM_NUM;
   expected_offset += dynsym_size;
   if (debug) {
     LOG(INFO) << "dynsym_offset=" << dynsym_offset << std::hex << " " << dynsym_offset;
@@ -180,13 +181,13 @@
   }
 
   // .hash
-  uint32_t hash_alignment = sizeof(llvm::ELF::Elf32_Word);  // Even for 64-bit
+  uint32_t hash_alignment = sizeof(Elf32_Word);  // Even for 64-bit
   uint32_t hash_offset = expected_offset = RoundUp(expected_offset, hash_alignment);
   const uint8_t HASH_NBUCKET = 0;
   const uint8_t HASH_NCHAIN  = 1;
   const uint8_t HASH_BUCKET0 = 2;
   const uint8_t HASH_NUM     = HASH_BUCKET0 + 1 + SYM_NUM;
-  uint32_t hash_size = sizeof(llvm::ELF::Elf32_Word) * HASH_NUM;
+  uint32_t hash_size = sizeof(Elf32_Word) * HASH_NUM;
   expected_offset += hash_size;
   if (debug) {
     LOG(INFO) << "hash_offset=" << hash_offset << std::hex << " " << hash_offset;
@@ -218,7 +219,7 @@
   }
 
   // .dynamic
-  // alignment would naturally be sizeof(llvm::ELF::Elf32_Word), but we want this in a new segment
+  // alignment would naturally be sizeof(Elf32_Word), but we want this in a new segment
   uint32_t dynamic_alignment = kPageSize;
   uint32_t dynamic_offset = expected_offset = RoundUp(expected_offset, dynamic_alignment);
   const uint8_t DH_SONAME = 0;
@@ -229,7 +230,7 @@
   const uint8_t DH_STRSZ  = 5;
   const uint8_t DH_NULL   = 6;
   const uint8_t DH_NUM    = 7;
-  uint32_t dynamic_size = sizeof(llvm::ELF::Elf32_Dyn) * DH_NUM;
+  uint32_t dynamic_size = sizeof(Elf32_Dyn) * DH_NUM;
   expected_offset += dynamic_size;
   if (debug) {
     LOG(INFO) << "dynamic_offset=" << dynamic_offset << std::hex << " " << dynamic_offset;
@@ -271,7 +272,7 @@
   }
 
   // section headers (after all sections)
-  uint32_t shdr_alignment = sizeof(llvm::ELF::Elf32_Word);
+  uint32_t shdr_alignment = sizeof(Elf32_Word);
   uint32_t shdr_offset = expected_offset = RoundUp(expected_offset, shdr_alignment);
   const uint8_t SH_NULL     = 0;
   const uint8_t SH_DYNSYM   = 1;
@@ -282,7 +283,7 @@
   const uint8_t SH_DYNAMIC  = 6;
   const uint8_t SH_SHSTRTAB = 7;
   const uint8_t SH_NUM      = 8;
-  uint32_t shdr_size = sizeof(llvm::ELF::Elf32_Shdr) * SH_NUM;
+  uint32_t shdr_size = sizeof(Elf32_Shdr) * SH_NUM;
   expected_offset += shdr_size;
   if (debug) {
     LOG(INFO) << "shdr_offset=" << shdr_offset << std::hex << " " << shdr_offset;
@@ -292,36 +293,36 @@
   // phase 2: initializing data
 
   // Elf32_Ehdr
-  llvm::ELF::Elf32_Ehdr elf_header;
+  Elf32_Ehdr elf_header;
   memset(&elf_header, 0, sizeof(elf_header));
-  elf_header.e_ident[llvm::ELF::EI_MAG0]       = llvm::ELF::ElfMagic[0];
-  elf_header.e_ident[llvm::ELF::EI_MAG1]       = llvm::ELF::ElfMagic[1];
-  elf_header.e_ident[llvm::ELF::EI_MAG2]       = llvm::ELF::ElfMagic[2];
-  elf_header.e_ident[llvm::ELF::EI_MAG3]       = llvm::ELF::ElfMagic[3];
-  elf_header.e_ident[llvm::ELF::EI_CLASS]      = llvm::ELF::ELFCLASS32;
-  elf_header.e_ident[llvm::ELF::EI_DATA]       = llvm::ELF::ELFDATA2LSB;
-  elf_header.e_ident[llvm::ELF::EI_VERSION]    = llvm::ELF::EV_CURRENT;
-  elf_header.e_ident[llvm::ELF::EI_OSABI]      = llvm::ELF::ELFOSABI_LINUX;
-  elf_header.e_ident[llvm::ELF::EI_ABIVERSION] = 0;
-  elf_header.e_type = llvm::ELF::ET_DYN;
+  elf_header.e_ident[EI_MAG0]       = ELFMAG0;
+  elf_header.e_ident[EI_MAG1]       = ELFMAG1;
+  elf_header.e_ident[EI_MAG2]       = ELFMAG2;
+  elf_header.e_ident[EI_MAG3]       = ELFMAG3;
+  elf_header.e_ident[EI_CLASS]      = ELFCLASS32;
+  elf_header.e_ident[EI_DATA]       = ELFDATA2LSB;
+  elf_header.e_ident[EI_VERSION]    = EV_CURRENT;
+  elf_header.e_ident[EI_OSABI]      = ELFOSABI_LINUX;
+  elf_header.e_ident[EI_ABIVERSION] = 0;
+  elf_header.e_type = ET_DYN;
   switch (compiler_driver_->GetInstructionSet()) {
     case kThumb2: {
-      elf_header.e_machine = llvm::ELF::EM_ARM;
-      elf_header.e_flags = llvm::ELF::EF_ARM_EABI_VER5;
+      elf_header.e_machine = EM_ARM;
+      elf_header.e_flags = EF_ARM_EABI_VER5;
       break;
     }
     case kX86: {
-      elf_header.e_machine = llvm::ELF::EM_386;
+      elf_header.e_machine = EM_386;
       elf_header.e_flags = 0;
       break;
     }
     case kMips: {
-      elf_header.e_machine = llvm::ELF::EM_MIPS;
-      elf_header.e_flags = (llvm::ELF::EF_MIPS_NOREORDER |
-                            llvm::ELF::EF_MIPS_PIC       |
-                            llvm::ELF::EF_MIPS_CPIC      |
-                            llvm::ELF::EF_MIPS_ABI_O32   |
-                            llvm::ELF::EF_MIPS_ARCH_32R2);
+      elf_header.e_machine = EM_MIPS;
+      elf_header.e_flags = (EF_MIPS_NOREORDER |
+                            EF_MIPS_PIC       |
+                            EF_MIPS_CPIC      |
+                            EF_MIPS_ABI_O32   |
+                            EF_MIPS_ARCH_32R2);
       break;
     }
     case kArm:
@@ -334,66 +335,66 @@
   elf_header.e_entry = 0;
   elf_header.e_phoff = phdr_offset;
   elf_header.e_shoff = shdr_offset;
-  elf_header.e_ehsize = sizeof(llvm::ELF::Elf32_Ehdr);
-  elf_header.e_phentsize = sizeof(llvm::ELF::Elf32_Phdr);
+  elf_header.e_ehsize = sizeof(Elf32_Ehdr);
+  elf_header.e_phentsize = sizeof(Elf32_Phdr);
   elf_header.e_phnum = PH_NUM;
-  elf_header.e_shentsize = sizeof(llvm::ELF::Elf32_Shdr);
+  elf_header.e_shentsize = sizeof(Elf32_Shdr);
   elf_header.e_shnum = SH_NUM;
   elf_header.e_shstrndx = SH_SHSTRTAB;
 
   // PHDR
-  llvm::ELF::Elf32_Phdr program_headers[PH_NUM];
+  Elf32_Phdr program_headers[PH_NUM];
   memset(&program_headers, 0, sizeof(program_headers));
 
-  program_headers[PH_PHDR].p_type    = llvm::ELF::PT_PHDR;
+  program_headers[PH_PHDR].p_type    = PT_PHDR;
   program_headers[PH_PHDR].p_offset  = phdr_offset;
   program_headers[PH_PHDR].p_vaddr   = phdr_offset;
   program_headers[PH_PHDR].p_paddr   = phdr_offset;
   program_headers[PH_PHDR].p_filesz  = sizeof(program_headers);
   program_headers[PH_PHDR].p_memsz   = sizeof(program_headers);
-  program_headers[PH_PHDR].p_flags   = llvm::ELF::PF_R;
+  program_headers[PH_PHDR].p_flags   = PF_R;
   program_headers[PH_PHDR].p_align   = phdr_alignment;
 
-  program_headers[PH_LOAD_R__].p_type    = llvm::ELF::PT_LOAD;
+  program_headers[PH_LOAD_R__].p_type    = PT_LOAD;
   program_headers[PH_LOAD_R__].p_offset  = 0;
   program_headers[PH_LOAD_R__].p_vaddr   = 0;
   program_headers[PH_LOAD_R__].p_paddr   = 0;
   program_headers[PH_LOAD_R__].p_filesz  = oat_data_offset + oat_data_size;
   program_headers[PH_LOAD_R__].p_memsz   = oat_data_offset + oat_data_size;
-  program_headers[PH_LOAD_R__].p_flags   = llvm::ELF::PF_R;
+  program_headers[PH_LOAD_R__].p_flags   = PF_R;
   program_headers[PH_LOAD_R__].p_align   = oat_data_alignment;
 
-  program_headers[PH_LOAD_R_X].p_type    = llvm::ELF::PT_LOAD;
+  program_headers[PH_LOAD_R_X].p_type    = PT_LOAD;
   program_headers[PH_LOAD_R_X].p_offset  = oat_exec_offset;
   program_headers[PH_LOAD_R_X].p_vaddr   = oat_exec_offset;
   program_headers[PH_LOAD_R_X].p_paddr   = oat_exec_offset;
   program_headers[PH_LOAD_R_X].p_filesz  = oat_exec_size;
   program_headers[PH_LOAD_R_X].p_memsz   = oat_exec_size;
-  program_headers[PH_LOAD_R_X].p_flags   = llvm::ELF::PF_R | llvm::ELF::PF_X;
+  program_headers[PH_LOAD_R_X].p_flags   = PF_R | PF_X;
   program_headers[PH_LOAD_R_X].p_align   = oat_exec_alignment;
 
   // TODO: PF_W for DYNAMIC is considered processor specific, do we need it?
-  program_headers[PH_LOAD_RW_].p_type    = llvm::ELF::PT_LOAD;
+  program_headers[PH_LOAD_RW_].p_type    = PT_LOAD;
   program_headers[PH_LOAD_RW_].p_offset  = dynamic_offset;
   program_headers[PH_LOAD_RW_].p_vaddr   = dynamic_offset;
   program_headers[PH_LOAD_RW_].p_paddr   = dynamic_offset;
   program_headers[PH_LOAD_RW_].p_filesz  = dynamic_size;
   program_headers[PH_LOAD_RW_].p_memsz   = dynamic_size;
-  program_headers[PH_LOAD_RW_].p_flags   = llvm::ELF::PF_R | llvm::ELF::PF_W;
+  program_headers[PH_LOAD_RW_].p_flags   = PF_R | PF_W;
   program_headers[PH_LOAD_RW_].p_align   = dynamic_alignment;
 
   // TODO: PF_W for DYNAMIC is considered processor specific, do we need it?
-  program_headers[PH_DYNAMIC].p_type    = llvm::ELF::PT_DYNAMIC;
+  program_headers[PH_DYNAMIC].p_type    = PT_DYNAMIC;
   program_headers[PH_DYNAMIC].p_offset  = dynamic_offset;
   program_headers[PH_DYNAMIC].p_vaddr   = dynamic_offset;
   program_headers[PH_DYNAMIC].p_paddr   = dynamic_offset;
   program_headers[PH_DYNAMIC].p_filesz  = dynamic_size;
   program_headers[PH_DYNAMIC].p_memsz   = dynamic_size;
-  program_headers[PH_DYNAMIC].p_flags   = llvm::ELF::PF_R | llvm::ELF::PF_W;
+  program_headers[PH_DYNAMIC].p_flags   = PF_R | PF_W;
   program_headers[PH_DYNAMIC].p_align   = dynamic_alignment;
 
   // .dynsym
-  llvm::ELF::Elf32_Sym dynsym[SYM_NUM];
+  Elf32_Sym dynsym[SYM_NUM];
   memset(&dynsym, 0, sizeof(dynsym));
 
   dynsym[SYM_UNDEF].st_name  = 0;
@@ -406,28 +407,28 @@
   dynsym[SYM_OATDATA].st_name  = dynstr_oatdata_offset;
   dynsym[SYM_OATDATA].st_value = oat_data_offset;
   dynsym[SYM_OATDATA].st_size  = oat_data_size;
-  dynsym[SYM_OATDATA].setBindingAndType(llvm::ELF::STB_GLOBAL, llvm::ELF::STT_OBJECT);
-  dynsym[SYM_OATDATA].st_other = llvm::ELF::STV_DEFAULT;
+  SetBindingAndType(&dynsym[SYM_OATDATA], STB_GLOBAL, STT_OBJECT);
+  dynsym[SYM_OATDATA].st_other = STV_DEFAULT;
   dynsym[SYM_OATDATA].st_shndx = SH_RODATA;
 
   dynsym[SYM_OATEXEC].st_name  = dynstr_oatexec_offset;
   dynsym[SYM_OATEXEC].st_value = oat_exec_offset;
   dynsym[SYM_OATEXEC].st_size  = oat_exec_size;
-  dynsym[SYM_OATEXEC].setBindingAndType(llvm::ELF::STB_GLOBAL, llvm::ELF::STT_OBJECT);
-  dynsym[SYM_OATEXEC].st_other = llvm::ELF::STV_DEFAULT;
+  SetBindingAndType(&dynsym[SYM_OATEXEC], STB_GLOBAL, STT_OBJECT);
+  dynsym[SYM_OATEXEC].st_other = STV_DEFAULT;
   dynsym[SYM_OATEXEC].st_shndx = SH_TEXT;
 
   dynsym[SYM_OATLASTWORD].st_name  = dynstr_oatlastword_offset;
   dynsym[SYM_OATLASTWORD].st_value = oat_exec_offset + oat_exec_size - 4;
   dynsym[SYM_OATLASTWORD].st_size  = 4;
-  dynsym[SYM_OATLASTWORD].setBindingAndType(llvm::ELF::STB_GLOBAL, llvm::ELF::STT_OBJECT);
-  dynsym[SYM_OATLASTWORD].st_other = llvm::ELF::STV_DEFAULT;
+  SetBindingAndType(&dynsym[SYM_OATLASTWORD], STB_GLOBAL, STT_OBJECT);
+  dynsym[SYM_OATLASTWORD].st_other = STV_DEFAULT;
   dynsym[SYM_OATLASTWORD].st_shndx = SH_TEXT;
 
   // .dynstr initialized above as dynstr
 
   // .hash
-  llvm::ELF::Elf32_Word hash[HASH_NUM];  // Note this is Elf32_Word even on 64-bit
+  Elf32_Word hash[HASH_NUM];  // Note this is Elf32_Word even on 64-bit
   hash[HASH_NBUCKET] = 1;
   hash[HASH_NCHAIN]  = SYM_NUM;
   hash[HASH_BUCKET0] = SYM_OATDATA;
@@ -439,38 +440,38 @@
   // .rodata and .text content come from oat_contents
 
   // .dynamic
-  llvm::ELF::Elf32_Dyn dynamic_headers[DH_NUM];
+  Elf32_Dyn dynamic_headers[DH_NUM];
   memset(&dynamic_headers, 0, sizeof(dynamic_headers));
 
-  dynamic_headers[DH_SONAME].d_tag = llvm::ELF::DT_SONAME;
+  dynamic_headers[DH_SONAME].d_tag = DT_SONAME;
   dynamic_headers[DH_SONAME].d_un.d_val = dynstr_soname_offset;
 
-  dynamic_headers[DH_HASH].d_tag = llvm::ELF::DT_HASH;
+  dynamic_headers[DH_HASH].d_tag = DT_HASH;
   dynamic_headers[DH_HASH].d_un.d_ptr = hash_offset;
 
-  dynamic_headers[DH_SYMTAB].d_tag = llvm::ELF::DT_SYMTAB;
+  dynamic_headers[DH_SYMTAB].d_tag = DT_SYMTAB;
   dynamic_headers[DH_SYMTAB].d_un.d_ptr = dynsym_offset;
 
-  dynamic_headers[DH_SYMENT].d_tag = llvm::ELF::DT_SYMENT;
-  dynamic_headers[DH_SYMENT].d_un.d_val = sizeof(llvm::ELF::Elf32_Sym);
+  dynamic_headers[DH_SYMENT].d_tag = DT_SYMENT;
+  dynamic_headers[DH_SYMENT].d_un.d_val = sizeof(Elf32_Sym);
 
-  dynamic_headers[DH_STRTAB].d_tag = llvm::ELF::DT_STRTAB;
+  dynamic_headers[DH_STRTAB].d_tag = DT_STRTAB;
   dynamic_headers[DH_STRTAB].d_un.d_ptr = dynstr_offset;
 
-  dynamic_headers[DH_STRSZ].d_tag = llvm::ELF::DT_STRSZ;
+  dynamic_headers[DH_STRSZ].d_tag = DT_STRSZ;
   dynamic_headers[DH_STRSZ].d_un.d_val = dynstr_size;
 
-  dynamic_headers[DH_NULL].d_tag = llvm::ELF::DT_NULL;
+  dynamic_headers[DH_NULL].d_tag = DT_NULL;
   dynamic_headers[DH_NULL].d_un.d_val = 0;
 
   // .shstrtab initialized above as shstrtab
 
   // section headers (after all sections)
-  llvm::ELF::Elf32_Shdr section_headers[SH_NUM];
+  Elf32_Shdr section_headers[SH_NUM];
   memset(&section_headers, 0, sizeof(section_headers));
 
   section_headers[SH_NULL].sh_name      = 0;
-  section_headers[SH_NULL].sh_type      = llvm::ELF::SHT_NULL;
+  section_headers[SH_NULL].sh_type      = SHT_NULL;
   section_headers[SH_NULL].sh_flags     = 0;
   section_headers[SH_NULL].sh_addr      = 0;
   section_headers[SH_NULL].sh_offset    = 0;
@@ -481,19 +482,19 @@
   section_headers[SH_NULL].sh_entsize   = 0;
 
   section_headers[SH_DYNSYM].sh_name      = shstrtab_dynsym_offset;
-  section_headers[SH_DYNSYM].sh_type      = llvm::ELF::SHT_DYNSYM;
-  section_headers[SH_DYNSYM].sh_flags     = llvm::ELF::SHF_ALLOC;
+  section_headers[SH_DYNSYM].sh_type      = SHT_DYNSYM;
+  section_headers[SH_DYNSYM].sh_flags     = SHF_ALLOC;
   section_headers[SH_DYNSYM].sh_addr      = dynsym_offset;
   section_headers[SH_DYNSYM].sh_offset    = dynsym_offset;
   section_headers[SH_DYNSYM].sh_size      = dynsym_size;
   section_headers[SH_DYNSYM].sh_link      = SH_DYNSTR;
   section_headers[SH_DYNSYM].sh_info      = 1;  // 1 because we have not STB_LOCAL symbols
   section_headers[SH_DYNSYM].sh_addralign = dynsym_alignment;
-  section_headers[SH_DYNSYM].sh_entsize   = sizeof(llvm::ELF::Elf32_Sym);
+  section_headers[SH_DYNSYM].sh_entsize   = sizeof(Elf32_Sym);
 
   section_headers[SH_DYNSTR].sh_name      = shstrtab_dynstr_offset;
-  section_headers[SH_DYNSTR].sh_type      = llvm::ELF::SHT_STRTAB;
-  section_headers[SH_DYNSTR].sh_flags     = llvm::ELF::SHF_ALLOC;
+  section_headers[SH_DYNSTR].sh_type      = SHT_STRTAB;
+  section_headers[SH_DYNSTR].sh_flags     = SHF_ALLOC;
   section_headers[SH_DYNSTR].sh_addr      = dynstr_offset;
   section_headers[SH_DYNSTR].sh_offset    = dynstr_offset;
   section_headers[SH_DYNSTR].sh_size      = dynstr_size;
@@ -503,19 +504,19 @@
   section_headers[SH_DYNSTR].sh_entsize   = 0;
 
   section_headers[SH_HASH].sh_name      = shstrtab_hash_offset;
-  section_headers[SH_HASH].sh_type      = llvm::ELF::SHT_HASH;
-  section_headers[SH_HASH].sh_flags     = llvm::ELF::SHF_ALLOC;
+  section_headers[SH_HASH].sh_type      = SHT_HASH;
+  section_headers[SH_HASH].sh_flags     = SHF_ALLOC;
   section_headers[SH_HASH].sh_addr      = hash_offset;
   section_headers[SH_HASH].sh_offset    = hash_offset;
   section_headers[SH_HASH].sh_size      = hash_size;
   section_headers[SH_HASH].sh_link      = SH_DYNSYM;
   section_headers[SH_HASH].sh_info      = 0;
   section_headers[SH_HASH].sh_addralign = hash_alignment;
-  section_headers[SH_HASH].sh_entsize   = sizeof(llvm::ELF::Elf32_Word);  // This is Elf32_Word even on 64-bit
+  section_headers[SH_HASH].sh_entsize   = sizeof(Elf32_Word);  // This is Elf32_Word even on 64-bit
 
   section_headers[SH_RODATA].sh_name      = shstrtab_rodata_offset;
-  section_headers[SH_RODATA].sh_type      = llvm::ELF::SHT_PROGBITS;
-  section_headers[SH_RODATA].sh_flags     = llvm::ELF::SHF_ALLOC;
+  section_headers[SH_RODATA].sh_type      = SHT_PROGBITS;
+  section_headers[SH_RODATA].sh_flags     = SHF_ALLOC;
   section_headers[SH_RODATA].sh_addr      = oat_data_offset;
   section_headers[SH_RODATA].sh_offset    = oat_data_offset;
   section_headers[SH_RODATA].sh_size      = oat_data_size;
@@ -525,8 +526,8 @@
   section_headers[SH_RODATA].sh_entsize   = 0;
 
   section_headers[SH_TEXT].sh_name      = shstrtab_text_offset;
-  section_headers[SH_TEXT].sh_type      = llvm::ELF::SHT_PROGBITS;
-  section_headers[SH_TEXT].sh_flags     = llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_EXECINSTR;
+  section_headers[SH_TEXT].sh_type      = SHT_PROGBITS;
+  section_headers[SH_TEXT].sh_flags     = SHF_ALLOC | SHF_EXECINSTR;
   section_headers[SH_TEXT].sh_addr      = oat_exec_offset;
   section_headers[SH_TEXT].sh_offset    = oat_exec_offset;
   section_headers[SH_TEXT].sh_size      = oat_exec_size;
@@ -537,18 +538,18 @@
 
   // TODO: SHF_WRITE for .dynamic is considered processor specific, do we need it?
   section_headers[SH_DYNAMIC].sh_name      = shstrtab_dynamic_offset;
-  section_headers[SH_DYNAMIC].sh_type      = llvm::ELF::SHT_DYNAMIC;
-  section_headers[SH_DYNAMIC].sh_flags     = llvm::ELF::SHF_WRITE | llvm::ELF::SHF_ALLOC;
+  section_headers[SH_DYNAMIC].sh_type      = SHT_DYNAMIC;
+  section_headers[SH_DYNAMIC].sh_flags     = SHF_WRITE | SHF_ALLOC;
   section_headers[SH_DYNAMIC].sh_addr      = dynamic_offset;
   section_headers[SH_DYNAMIC].sh_offset    = dynamic_offset;
   section_headers[SH_DYNAMIC].sh_size      = dynamic_size;
   section_headers[SH_DYNAMIC].sh_link      = SH_DYNSTR;
   section_headers[SH_DYNAMIC].sh_info      = 0;
   section_headers[SH_DYNAMIC].sh_addralign = dynamic_alignment;
-  section_headers[SH_DYNAMIC].sh_entsize   = sizeof(llvm::ELF::Elf32_Dyn);
+  section_headers[SH_DYNAMIC].sh_entsize   = sizeof(Elf32_Dyn);
 
   section_headers[SH_SHSTRTAB].sh_name      = shstrtab_shstrtab_offset;
-  section_headers[SH_SHSTRTAB].sh_type      = llvm::ELF::SHT_STRTAB;
+  section_headers[SH_SHSTRTAB].sh_type      = SHT_STRTAB;
   section_headers[SH_SHSTRTAB].sh_flags     = 0;
   section_headers[SH_SHSTRTAB].sh_addr      = shstrtab_offset;
   section_headers[SH_SHSTRTAB].sh_offset    = shstrtab_offset;
diff --git a/compiler/elf_writer_test.cc b/compiler/elf_writer_test.cc
index 95e5f9f..5bad0d0 100644
--- a/compiler/elf_writer_test.cc
+++ b/compiler/elf_writer_test.cc
@@ -31,7 +31,7 @@
 
 #define EXPECT_ELF_FILE_ADDRESS(ef, expected_value, symbol_name, build_map) \
   do { \
-    void* addr = reinterpret_cast<void*>(ef->FindSymbolAddress(::llvm::ELF::SHT_DYNSYM, \
+    void* addr = reinterpret_cast<void*>(ef->FindSymbolAddress(SHT_DYNSYM, \
                                                                symbol_name, \
                                                                build_map)); \
     EXPECT_NE(nullptr, addr); \