DebugInfo: Rename DwarfCompileUnit.* to DwarfUnit.* to match their contents.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196140 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 1983 deletions

diff --git a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
deleted file mode 100644
index eb7fcb4539..0000000000
--- a/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ /dev/null
@@ -1,1983 +0,0 @@
-//===-- llvm/CodeGen/DwarfUnit.cpp - Dwarf Type and Compile Units ---------===//
-//
-//                     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 constructing a dwarf compile unit.
-//
-//===----------------------------------------------------------------------===//
-
-#define DEBUG_TYPE "dwarfdebug"
-
-#include "DwarfCompileUnit.h"
-#include "DwarfAccelTable.h"
-#include "DwarfDebug.h"
-#include "llvm/ADT/APFloat.h"
-#include "llvm/DIBuilder.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/GlobalVariable.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCStreamer.h"
-#include "llvm/Target/Mangler.h"
-#include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetLoweringObjectFile.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Support/CommandLine.h"
-
-using namespace llvm;
-
-static cl::opt<bool> GenerateTypeUnits("generate-type-units", cl::Hidden,
-                                       cl::desc("Generate DWARF4 type units."),
-                                       cl::init(false));
-
-/// Unit - Compile unit constructor.
-Unit::Unit(unsigned UID, DIE *D, DICompileUnit Node, AsmPrinter *A,
-           DwarfDebug *DW, DwarfUnits *DWU)
-    : UniqueID(UID), Node(Node), CUDie(D), DebugInfoOffset(0), Asm(A), DD(DW),
-      DU(DWU), IndexTyDie(0) {
-  DIEIntegerOne = new (DIEValueAllocator) DIEInteger(1);
-}
-
-CompileUnit::CompileUnit(unsigned UID, DIE *D, DICompileUnit Node,
-                         AsmPrinter *A, DwarfDebug *DW, DwarfUnits *DWU)
-    : Unit(UID, D, Node, A, DW, DWU) {
-  insertDIE(Node, D);
-}
-
-TypeUnit::TypeUnit(unsigned UID, DIE *D, uint16_t Language, AsmPrinter *A,
-                   DwarfDebug *DW, DwarfUnits *DWU)
-    : Unit(UID, D, DICompileUnit(), A, DW, DWU), Language(Language) {}
-
-/// ~Unit - Destructor for compile unit.
-Unit::~Unit() {
-  for (unsigned j = 0, M = DIEBlocks.size(); j < M; ++j)
-    DIEBlocks[j]->~DIEBlock();
-}
-
-/// createDIEEntry - Creates a new DIEEntry to be a proxy for a debug
-/// information entry.
-DIEEntry *Unit::createDIEEntry(DIE *Entry) {
-  DIEEntry *Value = new (DIEValueAllocator) DIEEntry(Entry);
-  return Value;
-}
-
-/// getDefaultLowerBound - Return the default lower bound for an array. If the
-/// DWARF version doesn't handle the language, return -1.
-int64_t Unit::getDefaultLowerBound() const {
-  switch (getLanguage()) {
-  default:
-    break;
-
-  case dwarf::DW_LANG_C89:
-  case dwarf::DW_LANG_C99:
-  case dwarf::DW_LANG_C:
-  case dwarf::DW_LANG_C_plus_plus:
-  case dwarf::DW_LANG_ObjC:
-  case dwarf::DW_LANG_ObjC_plus_plus:
-    return 0;
-
-  case dwarf::DW_LANG_Fortran77:
-  case dwarf::DW_LANG_Fortran90:
-  case dwarf::DW_LANG_Fortran95:
-    return 1;
-
-  // The languages below have valid values only if the DWARF version >= 4.
-  case dwarf::DW_LANG_Java:
-  case dwarf::DW_LANG_Python:
-  case dwarf::DW_LANG_UPC:
-  case dwarf::DW_LANG_D:
-    if (dwarf::DWARF_VERSION >= 4)
-      return 0;
-    break;
-
-  case dwarf::DW_LANG_Ada83:
-  case dwarf::DW_LANG_Ada95:
-  case dwarf::DW_LANG_Cobol74:
-  case dwarf::DW_LANG_Cobol85:
-  case dwarf::DW_LANG_Modula2:
-  case dwarf::DW_LANG_Pascal83:
-  case dwarf::DW_LANG_PLI:
-    if (dwarf::DWARF_VERSION >= 4)
-      return 1;
-    break;
-  }
-
-  return -1;
-}
-
-/// Check whether the DIE for this MDNode can be shared across CUs.
-static bool isShareableAcrossCUs(DIDescriptor D) {
-  // When the MDNode can be part of the type system, the DIE can be shared
-  // across CUs.
-  // Combining type units and cross-CU DIE sharing is lower value (since
-  // cross-CU DIE sharing is used in LTO and removes type redundancy at that
-  // level already) but may be implementable for some value in projects
-  // building multiple independent libraries with LTO and then linking those
-  // together.
-  return (D.isType() ||
-          (D.isSubprogram() && !DISubprogram(D).isDefinition())) &&
-         !GenerateTypeUnits;
-}
-
-/// getDIE - Returns the debug information entry map slot for the
-/// specified debug variable. We delegate the request to DwarfDebug
-/// when the DIE for this MDNode can be shared across CUs. The mappings
-/// will be kept in DwarfDebug for shareable DIEs.
-DIE *Unit::getDIE(DIDescriptor D) const {
-  if (isShareableAcrossCUs(D))
-    return DD->getDIE(D);
-  return MDNodeToDieMap.lookup(D);
-}
-
-/// insertDIE - Insert DIE into the map. We delegate the request to DwarfDebug
-/// when the DIE for this MDNode can be shared across CUs. The mappings
-/// will be kept in DwarfDebug for shareable DIEs.
-void Unit::insertDIE(DIDescriptor Desc, DIE *D) {
-  if (isShareableAcrossCUs(Desc)) {
-    DD->insertDIE(Desc, D);
-    return;
-  }
-  MDNodeToDieMap.insert(std::make_pair(Desc, D));
-}
-
-/// addFlag - Add a flag that is true.
-void Unit::addFlag(DIE *Die, dwarf::Attribute Attribute) {
-  if (DD->getDwarfVersion() >= 4)
-    Die->addValue(Attribute, dwarf::DW_FORM_flag_present, DIEIntegerOne);
-  else
-    Die->addValue(Attribute, dwarf::DW_FORM_flag, DIEIntegerOne);
-}
-
-/// addUInt - Add an unsigned integer attribute data and value.
-///
-void Unit::addUInt(DIE *Die, dwarf::Attribute Attribute,
-                   Optional<dwarf::Form> Form, uint64_t Integer) {
-  if (!Form)
-    Form = DIEInteger::BestForm(false, Integer);
-  DIEValue *Value = Integer == 1 ? DIEIntegerOne : new (DIEValueAllocator)
-                        DIEInteger(Integer);
-  Die->addValue(Attribute, *Form, Value);
-}
-
-void Unit::addUInt(DIEBlock *Block, dwarf::Form Form, uint64_t Integer) {
-  addUInt(Block, (dwarf::Attribute)0, Form, Integer);
-}
-
-/// addSInt - Add an signed integer attribute data and value.
-///
-void Unit::addSInt(DIE *Die, dwarf::Attribute Attribute,
-                   Optional<dwarf::Form> Form, int64_t Integer) {
-  if (!Form)
-    Form = DIEInteger::BestForm(true, Integer);
-  DIEValue *Value = new (DIEValueAllocator) DIEInteger(Integer);
-  Die->addValue(Attribute, *Form, Value);
-}
-
-void Unit::addSInt(DIEBlock *Die, Optional<dwarf::Form> Form, int64_t Integer) {
-  addSInt(Die, (dwarf::Attribute)0, Form, Integer);
-}
-
-/// addString - Add a string attribute data and value. We always emit a
-/// reference to the string pool instead of immediate strings so that DIEs have
-/// more predictable sizes. In the case of split dwarf we emit an index
-/// into another table which gets us the static offset into the string
-/// table.
-void Unit::addString(DIE *Die, dwarf::Attribute Attribute, StringRef String) {
-  DIEValue *Value;
-  dwarf::Form Form;
-  if (!DD->useSplitDwarf()) {
-    MCSymbol *Symb = DU->getStringPoolEntry(String);
-    if (Asm->needsRelocationsForDwarfStringPool())
-      Value = new (DIEValueAllocator) DIELabel(Symb);
-    else {
-      MCSymbol *StringPool = DU->getStringPoolSym();
-      Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
-    }
-    Form = dwarf::DW_FORM_strp;
-  } else {
-    unsigned idx = DU->getStringPoolIndex(String);
-    Value = new (DIEValueAllocator) DIEInteger(idx);
-    Form = dwarf::DW_FORM_GNU_str_index;
-  }
-  DIEValue *Str = new (DIEValueAllocator) DIEString(Value, String);
-  Die->addValue(Attribute, Form, Str);
-}
-
-/// addLocalString - Add a string attribute data and value. This is guaranteed
-/// to be in the local string pool instead of indirected.
-void Unit::addLocalString(DIE *Die, dwarf::Attribute Attribute,
-                          StringRef String) {
-  MCSymbol *Symb = DU->getStringPoolEntry(String);
-  DIEValue *Value;
-  if (Asm->needsRelocationsForDwarfStringPool())
-    Value = new (DIEValueAllocator) DIELabel(Symb);
-  else {
-    MCSymbol *StringPool = DU->getStringPoolSym();
-    Value = new (DIEValueAllocator) DIEDelta(Symb, StringPool);
-  }
-  Die->addValue(Attribute, dwarf::DW_FORM_strp, Value);
-}
-
-/// addExpr - Add a Dwarf expression attribute data and value.
-///
-void Unit::addExpr(DIEBlock *Die, dwarf::Form Form, const MCExpr *Expr) {
-  DIEValue *Value = new (DIEValueAllocator) DIEExpr(Expr);
-  Die->addValue((dwarf::Attribute)0, Form, Value);
-}
-
-/// addLabel - Add a Dwarf label attribute data and value.
-///
-void Unit::addLabel(DIE *Die, dwarf::Attribute Attribute, dwarf::Form Form,
-                    const MCSymbol *Label) {
-  DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
-  Die->addValue(Attribute, Form, Value);
-}
-
-void Unit::addLabel(DIEBlock *Die, dwarf::Form Form, const MCSymbol *Label) {
-  addLabel(Die, (dwarf::Attribute)0, Form, Label);
-}
-
-/// addSectionLabel - Add a Dwarf section label attribute data and value.
-///
-void Unit::addSectionLabel(DIE *Die, dwarf::Attribute Attribute,
-                           const MCSymbol *Label) {
-  if (DD->getDwarfVersion() >= 4)
-    addLabel(Die, Attribute, dwarf::DW_FORM_sec_offset, Label);
-  else
-    addLabel(Die, Attribute, dwarf::DW_FORM_data4, Label);
-}
-
-/// addSectionOffset - Add an offset into a section attribute data and value.
-///
-void Unit::addSectionOffset(DIE *Die, dwarf::Attribute Attribute,
-                            uint64_t Integer) {
-  if (DD->getDwarfVersion() >= 4)
-    addUInt(Die, Attribute, dwarf::DW_FORM_sec_offset, Integer);
-  else
-    addUInt(Die, Attribute, dwarf::DW_FORM_data4, Integer);
-}
-
-/// addLabelAddress - Add a dwarf label attribute data and value using
-/// DW_FORM_addr or DW_FORM_GNU_addr_index.
-///
-void CompileUnit::addLabelAddress(DIE *Die, dwarf::Attribute Attribute,
-                                  MCSymbol *Label) {
-  if (Label)
-    DD->addArangeLabel(SymbolCU(this, Label));
-
-  if (!DD->useSplitDwarf()) {
-    if (Label != NULL) {
-      DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
-      Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
-    } else {
-      DIEValue *Value = new (DIEValueAllocator) DIEInteger(0);
-      Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
-    }
-  } else {
-    unsigned idx = DU->getAddrPoolIndex(Label);
-    DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
-    Die->addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
-  }
-}
-
-/// addOpAddress - Add a dwarf op address data and value using the
-/// form given and an op of either DW_FORM_addr or DW_FORM_GNU_addr_index.
-///
-void Unit::addOpAddress(DIEBlock *Die, const MCSymbol *Sym) {
-  if (!DD->useSplitDwarf()) {
-    addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_addr);
-    addLabel(Die, dwarf::DW_FORM_udata, Sym);
-  } else {
-    addUInt(Die, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_addr_index);
-    addUInt(Die, dwarf::DW_FORM_GNU_addr_index, DU->getAddrPoolIndex(Sym));
-  }
-}
-
-/// addSectionDelta - Add a section label delta attribute data and value.
-///
-void Unit::addSectionDelta(DIE *Die, dwarf::Attribute Attribute,
-                           const MCSymbol *Hi, const MCSymbol *Lo) {
-  DIEValue *Value = new (DIEValueAllocator) DIEDelta(Hi, Lo);
-  if (DD->getDwarfVersion() >= 4)
-    Die->addValue(Attribute, dwarf::DW_FORM_sec_offset, Value);
-  else
-    Die->addValue(Attribute, dwarf::DW_FORM_data4, Value);
-}
-
-/// addDIEEntry - Add a DIE attribute data and value.
-///
-void Unit::addDIEEntry(DIE *Die, dwarf::Attribute Attribute, DIE *Entry) {
-  addDIEEntry(Die, Attribute, createDIEEntry(Entry));
-}
-
-void Unit::addDIEEntry(DIE *Die, dwarf::Attribute Attribute, DIEEntry *Entry) {
-  const DIE *DieCU = Die->getUnitOrNull();
-  const DIE *EntryCU = Entry->getEntry()->getUnitOrNull();
-  if (!DieCU)
-    // We assume that Die belongs to this CU, if it is not linked to any CU yet.
-    DieCU = getCUDie();
-  if (!EntryCU)
-    EntryCU = getCUDie();
-  Die->addValue(Attribute, EntryCU == DieCU ? dwarf::DW_FORM_ref4
-                                            : dwarf::DW_FORM_ref_addr,
-                Entry);
-}
-
-/// Create a DIE with the given Tag, add the DIE to its parent, and
-/// call insertDIE if MD is not null.
-DIE *Unit::createAndAddDIE(unsigned Tag, DIE &Parent, DIDescriptor N) {
-  DIE *Die = new DIE(Tag);
-  Parent.addChild(Die);
-  if (N)
-    insertDIE(N, Die);
-  return Die;
-}
-
-/// addBlock - Add block data.
-///
-void Unit::addBlock(DIE *Die, dwarf::Attribute Attribute, DIEBlock *Block) {
-  Block->ComputeSize(Asm);
-  DIEBlocks.push_back(Block); // Memoize so we can call the destructor later on.
-  Die->addValue(Attribute, Block->BestForm(), Block);
-}
-
-/// addSourceLine - Add location information to specified debug information
-/// entry.
-void Unit::addSourceLine(DIE *Die, DIVariable V) {
-  // Verify variable.
-  if (!V.isVariable())
-    return;
-
-  unsigned Line = V.getLineNumber();
-  if (Line == 0)
-    return;
-  unsigned FileID =
-      DD->getOrCreateSourceID(V.getContext().getFilename(),
-                              V.getContext().getDirectory(), getUniqueID());
-  assert(FileID && "Invalid file id");
-  addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
-  addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
-}
-
-/// addSourceLine - Add location information to specified debug information
-/// entry.
-void Unit::addSourceLine(DIE *Die, DIGlobalVariable G) {
-  // Verify global variable.
-  if (!G.isGlobalVariable())
-    return;
-
-  unsigned Line = G.getLineNumber();
-  if (Line == 0)
-    return;
-  unsigned FileID =
-      DD->getOrCreateSourceID(G.getFilename(), G.getDirectory(), getUniqueID());
-  assert(FileID && "Invalid file id");
-  addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
-  addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
-}
-
-/// addSourceLine - Add location information to specified debug information
-/// entry.
-void Unit::addSourceLine(DIE *Die, DISubprogram SP) {
-  // Verify subprogram.
-  if (!SP.isSubprogram())
-    return;
-
-  // If the line number is 0, don't add it.
-  unsigned Line = SP.getLineNumber();
-  if (Line == 0)
-    return;
-
-  unsigned FileID = DD->getOrCreateSourceID(SP.getFilename(), SP.getDirectory(),
-                                            getUniqueID());
-  assert(FileID && "Invalid file id");
-  addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
-  addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
-}
-
-/// addSourceLine - Add location information to specified debug information
-/// entry.
-void Unit::addSourceLine(DIE *Die, DIType Ty) {
-  // Verify type.
-  if (!Ty.isType())
-    return;
-
-  unsigned Line = Ty.getLineNumber();
-  if (Line == 0)
-    return;
-  unsigned FileID = DD->getOrCreateSourceID(Ty.getFilename(), Ty.getDirectory(),
-                                            getUniqueID());
-  assert(FileID && "Invalid file id");
-  addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
-  addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
-}
-
-/// addSourceLine - Add location information to specified debug information
-/// entry.
-void Unit::addSourceLine(DIE *Die, DIObjCProperty Ty) {
-  // Verify type.
-  if (!Ty.isObjCProperty())
-    return;
-
-  unsigned Line = Ty.getLineNumber();
-  if (Line == 0)
-    return;
-  DIFile File = Ty.getFile();
-  unsigned FileID = DD->getOrCreateSourceID(File.getFilename(),
-                                            File.getDirectory(), getUniqueID());
-  assert(FileID && "Invalid file id");
-  addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
-  addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
-}
-
-/// addSourceLine - Add location information to specified debug information
-/// entry.
-void Unit::addSourceLine(DIE *Die, DINameSpace NS) {
-  // Verify namespace.
-  if (!NS.Verify())
-    return;
-
-  unsigned Line = NS.getLineNumber();
-  if (Line == 0)
-    return;
-  StringRef FN = NS.getFilename();
-
-  unsigned FileID =
-      DD->getOrCreateSourceID(FN, NS.getDirectory(), getUniqueID());
-  assert(FileID && "Invalid file id");
-  addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
-  addUInt(Die, dwarf::DW_AT_decl_line, None, Line);
-}
-
-/// addVariableAddress - Add DW_AT_location attribute for a
-/// DbgVariable based on provided MachineLocation.
-void Unit::addVariableAddress(const DbgVariable &DV, DIE *Die,
-                              MachineLocation Location) {
-  if (DV.variableHasComplexAddress())
-    addComplexAddress(DV, Die, dwarf::DW_AT_location, Location);
-  else if (DV.isBlockByrefVariable())
-    addBlockByrefAddress(DV, Die, dwarf::DW_AT_location, Location);
-  else
-    addAddress(Die, dwarf::DW_AT_location, Location,
-               DV.getVariable().isIndirect());
-}
-
-/// addRegisterOp - Add register operand.
-void Unit::addRegisterOp(DIEBlock *TheDie, unsigned Reg) {
-  const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
-  unsigned DWReg = RI->getDwarfRegNum(Reg, false);
-  if (DWReg < 32)
-    addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_reg0 + DWReg);
-  else {
-    addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_regx);
-    addUInt(TheDie, dwarf::DW_FORM_udata, DWReg);
-  }
-}
-
-/// addRegisterOffset - Add register offset.
-void Unit::addRegisterOffset(DIEBlock *TheDie, unsigned Reg, int64_t Offset) {
-  const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
-  unsigned DWReg = RI->getDwarfRegNum(Reg, false);
-  const TargetRegisterInfo *TRI = Asm->TM.getRegisterInfo();
-  if (Reg == TRI->getFrameRegister(*Asm->MF))
-    // If variable offset is based in frame register then use fbreg.
-    addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_fbreg);
-  else if (DWReg < 32)
-    addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_breg0 + DWReg);
-  else {
-    addUInt(TheDie, dwarf::DW_FORM_data1, dwarf::DW_OP_bregx);
-    addUInt(TheDie, dwarf::DW_FORM_udata, DWReg);
-  }
-  addSInt(TheDie, dwarf::DW_FORM_sdata, Offset);
-}
-
-/// addAddress - Add an address attribute to a die based on the location
-/// provided.
-void Unit::addAddress(DIE *Die, dwarf::Attribute Attribute,
-                      const MachineLocation &Location, bool Indirect) {
-  DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
-
-  if (Location.isReg() && !Indirect)
-    addRegisterOp(Block, Location.getReg());
-  else {
-    addRegisterOffset(Block, Location.getReg(), Location.getOffset());
-    if (Indirect && !Location.isReg()) {
-      addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
-    }
-  }
-
-  // Now attach the location information to the DIE.
-  addBlock(Die, Attribute, Block);
-}
-
-/// addComplexAddress - Start with the address based on the location provided,
-/// and generate the DWARF information necessary to find the actual variable
-/// given the extra address information encoded in the DIVariable, starting from
-/// the starting location.  Add the DWARF information to the die.
-///
-void Unit::addComplexAddress(const DbgVariable &DV, DIE *Die,
-                             dwarf::Attribute Attribute,
-                             const MachineLocation &Location) {
-  DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
-  unsigned N = DV.getNumAddrElements();
-  unsigned i = 0;
-  if (Location.isReg()) {
-    if (N >= 2 && DV.getAddrElement(0) == DIBuilder::OpPlus) {
-      // If first address element is OpPlus then emit
-      // DW_OP_breg + Offset instead of DW_OP_reg + Offset.
-      addRegisterOffset(Block, Location.getReg(), DV.getAddrElement(1));
-      i = 2;
-    } else
-      addRegisterOp(Block, Location.getReg());
-  } else
-    addRegisterOffset(Block, Location.getReg(), Location.getOffset());
-
-  for (; i < N; ++i) {
-    uint64_t Element = DV.getAddrElement(i);
-    if (Element == DIBuilder::OpPlus) {
-      addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
-      addUInt(Block, dwarf::DW_FORM_udata, DV.getAddrElement(++i));
-    } else if (Element == DIBuilder::OpDeref) {
-      if (!Location.isReg())
-        addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
-    } else
-      llvm_unreachable("unknown DIBuilder Opcode");
-  }
-
-  // Now attach the location information to the DIE.
-  addBlock(Die, Attribute, Block);
-}
-
-/* Byref variables, in Blocks, are declared by the programmer as "SomeType
-   VarName;", but the compiler creates a __Block_byref_x_VarName struct, and
-   gives the variable VarName either the struct, or a pointer to the struct, as
-   its type.  This is necessary for various behind-the-scenes things the
-   compiler needs to do with by-reference variables in Blocks.
-
-   However, as far as the original *programmer* is concerned, the variable
-   should still have type 'SomeType', as originally declared.
-
-   The function getBlockByrefType dives into the __Block_byref_x_VarName
-   struct to find the original type of the variable, which is then assigned to
-   the variable's Debug Information Entry as its real type.  So far, so good.
-   However now the debugger will expect the variable VarName to have the type
-   SomeType.  So we need the location attribute for the variable to be an
-   expression that explains to the debugger how to navigate through the
-   pointers and struct to find the actual variable of type SomeType.
-
-   The following function does just that.  We start by getting
-   the "normal" location for the variable. This will be the location
-   of either the struct __Block_byref_x_VarName or the pointer to the
-   struct __Block_byref_x_VarName.
-
-   The struct will look something like:
-
-   struct __Block_byref_x_VarName {
-     ... <various fields>
-     struct __Block_byref_x_VarName *forwarding;
-     ... <various other fields>
-     SomeType VarName;
-     ... <maybe more fields>
-   };
-
-   If we are given the struct directly (as our starting point) we
-   need to tell the debugger to:
-
-   1).  Add the offset of the forwarding field.
-
-   2).  Follow that pointer to get the real __Block_byref_x_VarName
-   struct to use (the real one may have been copied onto the heap).
-
-   3).  Add the offset for the field VarName, to find the actual variable.
-
-   If we started with a pointer to the struct, then we need to
-   dereference that pointer first, before the other steps.
-   Translating this into DWARF ops, we will need to append the following
-   to the current location description for the variable:
-
-   DW_OP_deref                    -- optional, if we start with a pointer
-   DW_OP_plus_uconst <forward_fld_offset>
-   DW_OP_deref
-   DW_OP_plus_uconst <varName_fld_offset>
-
-   That is what this function does.  */
-
-/// addBlockByrefAddress - Start with the address based on the location
-/// provided, and generate the DWARF information necessary to find the
-/// actual Block variable (navigating the Block struct) based on the
-/// starting location.  Add the DWARF information to the die.  For
-/// more information, read large comment just above here.
-///
-void Unit::addBlockByrefAddress(const DbgVariable &DV, DIE *Die,
-                                dwarf::Attribute Attribute,
-                                const MachineLocation &Location) {
-  DIType Ty = DV.getType();
-  DIType TmpTy = Ty;
-  uint16_t Tag = Ty.getTag();
-  bool isPointer = false;
-
-  StringRef varName = DV.getName();
-
-  if (Tag == dwarf::DW_TAG_pointer_type) {
-    DIDerivedType DTy(Ty);
-    TmpTy = resolve(DTy.getTypeDerivedFrom());
-    isPointer = true;
-  }
-
-  DICompositeType blockStruct(TmpTy);
-
-  // Find the __forwarding field and the variable field in the __Block_byref
-  // struct.
-  DIArray Fields = blockStruct.getTypeArray();
-  DIDerivedType varField;
-  DIDerivedType forwardingField;
-
-  for (unsigned i = 0, N = Fields.getNumElements(); i < N; ++i) {
-    DIDerivedType DT(Fields.getElement(i));
-    StringRef fieldName = DT.getName();
-    if (fieldName == "__forwarding")
-      forwardingField = DT;
-    else if (fieldName == varName)
-      varField = DT;
-  }
-
-  // Get the offsets for the forwarding field and the variable field.
-  unsigned forwardingFieldOffset = forwardingField.getOffsetInBits() >> 3;
-  unsigned varFieldOffset = varField.getOffsetInBits() >> 2;
-
-  // Decode the original location, and use that as the start of the byref
-  // variable's location.
-  DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
-
-  if (Location.isReg())
-    addRegisterOp(Block, Location.getReg());
-  else
-    addRegisterOffset(Block, Location.getReg(), Location.getOffset());
-
-  // If we started with a pointer to the __Block_byref... struct, then
-  // the first thing we need to do is dereference the pointer (DW_OP_deref).
-  if (isPointer)
-    addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
-
-  // Next add the offset for the '__forwarding' field:
-  // DW_OP_plus_uconst ForwardingFieldOffset.  Note there's no point in
-  // adding the offset if it's 0.
-  if (forwardingFieldOffset > 0) {
-    addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
-    addUInt(Block, dwarf::DW_FORM_udata, forwardingFieldOffset);
-  }
-
-  // Now dereference the __forwarding field to get to the real __Block_byref
-  // struct:  DW_OP_deref.
-  addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
-
-  // Now that we've got the real __Block_byref... struct, add the offset
-  // for the variable's field to get to the location of the actual variable:
-  // DW_OP_plus_uconst varFieldOffset.  Again, don't add if it's 0.
-  if (varFieldOffset > 0) {
-    addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
-    addUInt(Block, dwarf::DW_FORM_udata, varFieldOffset);
-  }
-
-  // Now attach the location information to the DIE.
-  addBlock(Die, Attribute, Block);
-}
-
-/// isTypeSigned - Return true if the type is signed.
-static bool isTypeSigned(DwarfDebug *DD, DIType Ty, int *SizeInBits) {
-  if (Ty.isDerivedType())
-    return isTypeSigned(DD, DD->resolve(DIDerivedType(Ty).getTypeDerivedFrom()),
-                        SizeInBits);
-  if (Ty.isBasicType())
-    if (DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed ||
-        DIBasicType(Ty).getEncoding() == dwarf::DW_ATE_signed_char) {
-      *SizeInBits = Ty.getSizeInBits();
-      return true;
-    }
-  return false;
-}
-
-/// Return true if type encoding is unsigned.
-static bool isUnsignedDIType(DwarfDebug *DD, DIType Ty) {
-  DIDerivedType DTy(Ty);
-  if (DTy.isDerivedType())
-    return isUnsignedDIType(DD, DD->resolve(DTy.getTypeDerivedFrom()));
-
-  DIBasicType BTy(Ty);
-  if (BTy.isBasicType()) {
-    unsigned Encoding = BTy.getEncoding();
-    if (Encoding == dwarf::DW_ATE_unsigned ||
-        Encoding == dwarf::DW_ATE_unsigned_char ||
-        Encoding == dwarf::DW_ATE_boolean)
-      return true;
-  }
-  return false;
-}
-
-/// If this type is derived from a base type then return base type size.
-static uint64_t getBaseTypeSize(DwarfDebug *DD, DIDerivedType Ty) {
-  unsigned Tag = Ty.getTag();
-
-  if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
-      Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
-      Tag != dwarf::DW_TAG_restrict_type)
-    return Ty.getSizeInBits();
-
-  DIType BaseType = DD->resolve(Ty.getTypeDerivedFrom());
-
-  // If this type is not derived from any type then take conservative approach.
-  if (!BaseType.isValid())
-    return Ty.getSizeInBits();
-
-  // If this is a derived type, go ahead and get the base type, unless it's a
-  // reference then it's just the size of the field. Pointer types have no need
-  // of this since they're a different type of qualification on the type.
-  if (BaseType.getTag() == dwarf::DW_TAG_reference_type ||
-      BaseType.getTag() == dwarf::DW_TAG_rvalue_reference_type)
-    return Ty.getSizeInBits();
-
-  if (BaseType.isDerivedType())
-    return getBaseTypeSize(DD, DIDerivedType(BaseType));
-
-  return BaseType.getSizeInBits();
-}
-
-/// addConstantValue - Add constant value entry in variable DIE.
-void Unit::addConstantValue(DIE *Die, const MachineOperand &MO, DIType Ty) {
-  // FIXME: This is a bit conservative/simple - it emits negative values at
-  // their maximum bit width which is a bit unfortunate (& doesn't prefer
-  // udata/sdata over dataN as suggested by the DWARF spec)
-  assert(MO.isImm() && "Invalid machine operand!");
-  int SizeInBits = -1;
-  bool SignedConstant = isTypeSigned(DD, Ty, &SizeInBits);
-  dwarf::Form Form;
-
-  // If we're a signed constant definitely use sdata.
-  if (SignedConstant) {
-    addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata, MO.getImm());
-    return;
-  }
-
-  // Else use data for now unless it's larger than we can deal with.
-  switch (SizeInBits) {
-  case 8:
-    Form = dwarf::DW_FORM_data1;
-    break;
-  case 16:
-    Form = dwarf::DW_FORM_data2;
-    break;
-  case 32:
-    Form = dwarf::DW_FORM_data4;
-    break;
-  case 64:
-    Form = dwarf::DW_FORM_data8;
-    break;
-  default:
-    Form = dwarf::DW_FORM_udata;
-    addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
-    return;
-  }
-  addUInt(Die, dwarf::DW_AT_const_value, Form, MO.getImm());
-}
-
-/// addConstantFPValue - Add constant value entry in variable DIE.
-void Unit::addConstantFPValue(DIE *Die, const MachineOperand &MO) {
-  assert(MO.isFPImm() && "Invalid machine operand!");
-  DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
-  APFloat FPImm = MO.getFPImm()->getValueAPF();
-
-  // Get the raw data form of the floating point.
-  const APInt FltVal = FPImm.bitcastToAPInt();
-  const char *FltPtr = (const char *)FltVal.getRawData();
-
-  int NumBytes = FltVal.getBitWidth() / 8; // 8 bits per byte.
-  bool LittleEndian = Asm->getDataLayout().isLittleEndian();
-  int Incr = (LittleEndian ? 1 : -1);
-  int Start = (LittleEndian ? 0 : NumBytes - 1);
-  int Stop = (LittleEndian ? NumBytes : -1);
-
-  // Output the constant to DWARF one byte at a time.
-  for (; Start != Stop; Start += Incr)
-    addUInt(Block, dwarf::DW_FORM_data1, (unsigned char)0xFF & FltPtr[Start]);
-
-  addBlock(Die, dwarf::DW_AT_const_value, Block);
-}
-
-/// addConstantFPValue - Add constant value entry in variable DIE.
-void Unit::addConstantFPValue(DIE *Die, const ConstantFP *CFP) {
-  // Pass this down to addConstantValue as an unsigned bag of bits.
-  addConstantValue(Die, CFP->getValueAPF().bitcastToAPInt(), true);
-}
-
-/// addConstantValue - Add constant value entry in variable DIE.
-void Unit::addConstantValue(DIE *Die, const ConstantInt *CI, bool Unsigned) {
-  addConstantValue(Die, CI->getValue(), Unsigned);
-}
-
-// addConstantValue - Add constant value entry in variable DIE.
-void Unit::addConstantValue(DIE *Die, const APInt &Val, bool Unsigned) {
-  unsigned CIBitWidth = Val.getBitWidth();
-  if (CIBitWidth <= 64) {
-    // If we're a signed constant definitely use sdata.
-    if (!Unsigned) {
-      addSInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata,
-              Val.getSExtValue());
-      return;
-    }
-
-    // Else use data for now unless it's larger than we can deal with.
-    dwarf::Form Form;
-    switch (CIBitWidth) {
-    case 8:
-      Form = dwarf::DW_FORM_data1;
-      break;
-    case 16:
-      Form = dwarf::DW_FORM_data2;
-      break;
-    case 32:
-      Form = dwarf::DW_FORM_data4;
-      break;
-    case 64:
-      Form = dwarf::DW_FORM_data8;
-      break;
-    default:
-      addUInt(Die, dwarf::DW_AT_const_value, dwarf::DW_FORM_udata,
-              Val.getZExtValue());
-      return;
-    }
-    addUInt(Die, dwarf::DW_AT_const_value, Form, Val.getZExtValue());
-    return;
-  }
-
-  DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
-
-  // Get the raw data form of the large APInt.
-  const uint64_t *Ptr64 = Val.getRawData();
-
-  int NumBytes = Val.getBitWidth() / 8; // 8 bits per byte.
-  bool LittleEndian = Asm->getDataLayout().isLittleEndian();
-
-  // Output the constant to DWARF one byte at a time.
-  for (int i = 0; i < NumBytes; i++) {
-    uint8_t c;
-    if (LittleEndian)
-      c = Ptr64[i / 8] >> (8 * (i & 7));
-    else
-      c = Ptr64[(NumBytes - 1 - i) / 8] >> (8 * ((NumBytes - 1 - i) & 7));
-    addUInt(Block, dwarf::DW_FORM_data1, c);
-  }
-
-  addBlock(Die, dwarf::DW_AT_const_value, Block);
-}
-
-/// addTemplateParams - Add template parameters into buffer.
-void Unit::addTemplateParams(DIE &Buffer, DIArray TParams) {
-  // Add template parameters.
-  for (unsigned i = 0, e = TParams.getNumElements(); i != e; ++i) {
-    DIDescriptor Element = TParams.getElement(i);
-    if (Element.isTemplateTypeParameter())
-      constructTemplateTypeParameterDIE(Buffer,
-                                        DITemplateTypeParameter(Element));
-    else if (Element.isTemplateValueParameter())
-      constructTemplateValueParameterDIE(Buffer,
-                                         DITemplateValueParameter(Element));
-  }
-}
-
-/// getOrCreateContextDIE - Get context owner's DIE.
-DIE *Unit::getOrCreateContextDIE(DIScope Context) {
-  if (!Context || Context.isFile())
-    return getCUDie();
-  if (Context.isType())
-    return getOrCreateTypeDIE(DIType(Context));
-  if (Context.isNameSpace())
-    return getOrCreateNameSpace(DINameSpace(Context));
-  if (Context.isSubprogram())
-    return getOrCreateSubprogramDIE(DISubprogram(Context));
-  return getDIE(Context);
-}
-
-DIE *Unit::createTypeDIE(DICompositeType Ty) {
-  DIScope Context = resolve(Ty.getContext());
-  DIE *ContextDIE = getOrCreateContextDIE(Context);
-
-  DIE *TyDIE = getDIE(Ty);
-  if (TyDIE)
-    return TyDIE;
-
-  // Create new type.
-  TyDIE = createAndAddDIE(Ty.getTag(), *ContextDIE, Ty);
-
-  constructTypeDIE(*TyDIE, Ty);
-
-  updateAcceleratorTables(Context, Ty, TyDIE);
-  return TyDIE;
-}
-
-/// Return true if the type is appropriately scoped to be contained inside
-/// its own type unit.
-static bool isTypeUnitScoped(DIType Ty, const DwarfDebug *DD) {
-  DIScope Parent = DD->resolve(Ty.getContext());
-  while (Parent) {
-    // Don't generate a hash for anything scoped inside a function.
-    if (Parent.isSubprogram())
-      return false;
-    Parent = DD->resolve(Parent.getContext());
-  }
-  return true;
-}
-
-/// Return true if the type should be split out into a type unit.
-static bool shouldCreateTypeUnit(DICompositeType CTy, const DwarfDebug *DD) {
-  if (!GenerateTypeUnits)
-    return false;
-
-  uint16_t Tag = CTy.getTag();
-
-  switch (Tag) {
-  case dwarf::DW_TAG_structure_type:
-  case dwarf::DW_TAG_union_type:
-  case dwarf::DW_TAG_enumeration_type:
-  case dwarf::DW_TAG_class_type:
-    // If this is a class, structure, union, or enumeration type
-    // that is a definition (not a declaration), and not scoped
-    // inside a function then separate this out as a type unit.
-    return !CTy.isForwardDecl() && isTypeUnitScoped(CTy, DD);
-  default:
-    return false;
-  }
-}
-
-/// getOrCreateTypeDIE - Find existing DIE or create new DIE for the
-/// given DIType.
-DIE *Unit::getOrCreateTypeDIE(const MDNode *TyNode) {
-  if (!TyNode)
-    return NULL;
-
-  DIType Ty(TyNode);
-  assert(Ty.isType());
-
-  // Construct the context before querying for the existence of the DIE in case
-  // such construction creates the DIE.
-  DIScope Context = resolve(Ty.getContext());
-  DIE *ContextDIE = getOrCreateContextDIE(Context);
-  assert(ContextDIE);
-
-  DIE *TyDIE = getDIE(Ty);
-  if (TyDIE)
-    return TyDIE;
-
-  // Create new type.
-  TyDIE = createAndAddDIE(Ty.getTag(), *ContextDIE, Ty);
-
-  if (Ty.isBasicType())
-    constructTypeDIE(*TyDIE, DIBasicType(Ty));
-  else if (Ty.isCompositeType()) {
-    DICompositeType CTy(Ty);
-    if (shouldCreateTypeUnit(CTy, DD)) {
-      DD->addTypeUnitType(getLanguage(), TyDIE, CTy);
-      // Skip updating the accellerator tables since this is not the full type
-      return TyDIE;
-    }
-    constructTypeDIE(*TyDIE, CTy);
-  } else {
-    assert(Ty.isDerivedType() && "Unknown kind of DIType");
-    constructTypeDIE(*TyDIE, DIDerivedType(Ty));
-  }
-
-  updateAcceleratorTables(Context, Ty, TyDIE);
-
-  return TyDIE;
-}
-
-void Unit::updateAcceleratorTables(DIScope Context, DIType Ty,
-                                   const DIE *TyDIE) {
-  if (!Ty.getName().empty() && !Ty.isForwardDecl()) {
-    bool IsImplementation = 0;
-    if (Ty.isCompositeType()) {
-      DICompositeType CT(Ty);
-      // A runtime language of 0 actually means C/C++ and that any
-      // non-negative value is some version of Objective-C/C++.
-      IsImplementation = (CT.getRunTimeLang() == 0) || CT.isObjcClassComplete();
-    }
-    unsigned Flags = IsImplementation ? dwarf::DW_FLAG_type_implementation : 0;
-    addAccelType(Ty.getName(), std::make_pair(TyDIE, Flags));
-
-    if (!Context || Context.isCompileUnit() || Context.isFile() ||
-        Context.isNameSpace())
-      GlobalTypes[getParentContextString(Context) + Ty.getName().str()] = TyDIE;
-  }
-}
-
-/// addType - Add a new type attribute to the specified entity.
-void Unit::addType(DIE *Entity, DIType Ty, dwarf::Attribute Attribute) {
-  assert(Ty && "Trying to add a type that doesn't exist?");
-
-  // Check for pre-existence.
-  DIEEntry *Entry = getDIEEntry(Ty);
-  // If it exists then use the existing value.
-  if (Entry) {
-    addDIEEntry(Entity, Attribute, Entry);
-    return;
-  }
-
-  // Construct type.
-  DIE *Buffer = getOrCreateTypeDIE(Ty);
-
-  // Set up proxy.
-  Entry = createDIEEntry(Buffer);
-  insertDIEEntry(Ty, Entry);
-  addDIEEntry(Entity, Attribute, Entry);
-}
-
-// Accelerator table mutators - add each name along with its companion
-// DIE to the proper table while ensuring that the name that we're going
-// to reference is in the string table. We do this since the names we
-// add may not only be identical to the names in the DIE.
-void Unit::addAccelName(StringRef Name, const DIE *Die) {
-  DU->getStringPoolEntry(Name);
-  std::vector<const DIE *> &DIEs = AccelNames[Name];
-  DIEs.push_back(Die);
-}
-
-void Unit::addAccelObjC(StringRef Name, const DIE *Die) {
-  DU->getStringPoolEntry(Name);
-  std::vector<const DIE *> &DIEs = AccelObjC[Name];
-  DIEs.push_back(Die);
-}
-
-void Unit::addAccelNamespace(StringRef Name, const DIE *Die) {
-  DU->getStringPoolEntry(Name);
-  std::vector<const DIE *> &DIEs = AccelNamespace[Name];
-  DIEs.push_back(Die);
-}
-
-void Unit::addAccelType(StringRef Name, std::pair<const DIE *, unsigned> Die) {
-  DU->getStringPoolEntry(Name);
-  std::vector<std::pair<const DIE *, unsigned> > &DIEs = AccelTypes[Name];
-  DIEs.push_back(Die);
-}
-
-/// addGlobalName - Add a new global name to the compile unit.
-void Unit::addGlobalName(StringRef Name, DIE *Die, DIScope Context) {
-  std::string FullName = getParentContextString(Context) + Name.str();
-  GlobalNames[FullName] = Die;
-}
-
-/// getParentContextString - Walks the metadata parent chain in a language
-/// specific manner (using the compile unit language) and returns
-/// it as a string. This is done at the metadata level because DIEs may
-/// not currently have been added to the parent context and walking the
-/// DIEs looking for names is more expensive than walking the metadata.
-std::string Unit::getParentContextString(DIScope Context) const {
-  if (!Context)
-    return "";
-
-  // FIXME: Decide whether to implement this for non-C++ languages.
-  if (getLanguage() != dwarf::DW_LANG_C_plus_plus)
-    return "";
-
-  std::string CS;
-  SmallVector<DIScope, 1> Parents;
-  while (!Context.isCompileUnit()) {
-    Parents.push_back(Context);
-    if (Context.getContext())
-      Context = resolve(Context.getContext());
-    else
-      // Structure, etc types will have a NULL context if they're at the top
-      // level.
-      break;
-  }
-
-  // Reverse iterate over our list to go from the outermost construct to the
-  // innermost.
-  for (SmallVectorImpl<DIScope>::reverse_iterator I = Parents.rbegin(),
-                                                  E = Parents.rend();
-       I != E; ++I) {
-    DIScope Ctx = *I;
-    StringRef Name = Ctx.getName();
-    if (!Name.empty()) {
-      CS += Name;
-      CS += "::";
-    }
-  }
-  return CS;
-}
-
-/// constructTypeDIE - Construct basic type die from DIBasicType.
-void Unit::constructTypeDIE(DIE &Buffer, DIBasicType BTy) {
-  // Get core information.
-  StringRef Name = BTy.getName();
-  // Add name if not anonymous or intermediate type.
-  if (!Name.empty())
-    addString(&Buffer, dwarf::DW_AT_name, Name);
-
-  // An unspecified type only has a name attribute.
-  if (BTy.getTag() == dwarf::DW_TAG_unspecified_type)
-    return;
-
-  addUInt(&Buffer, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
-          BTy.getEncoding());
-
-  uint64_t Size = BTy.getSizeInBits() >> 3;
-  addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
-}
-
-/// constructTypeDIE - Construct derived type die from DIDerivedType.
-void Unit::constructTypeDIE(DIE &Buffer, DIDerivedType DTy) {
-  // Get core information.
-  StringRef Name = DTy.getName();
-  uint64_t Size = DTy.getSizeInBits() >> 3;
-  uint16_t Tag = Buffer.getTag();
-
-  // Map to main type, void will not have a type.
-  DIType FromTy = resolve(DTy.getTypeDerivedFrom());
-  if (FromTy)
-    addType(&Buffer, FromTy);
-
-  // Add name if not anonymous or intermediate type.
-  if (!Name.empty())
-    addString(&Buffer, dwarf::DW_AT_name, Name);
-
-  // Add size if non-zero (derived types might be zero-sized.)
-  if (Size && Tag != dwarf::DW_TAG_pointer_type)
-    addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
-
-  if (Tag == dwarf::DW_TAG_ptr_to_member_type)
-    addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
-                getOrCreateTypeDIE(resolve(DTy.getClassType())));
-  // Add source line info if available and TyDesc is not a forward declaration.
-  if (!DTy.isForwardDecl())
-    addSourceLine(&Buffer, DTy);
-}
-
-/// constructTypeDIE - Construct type DIE from DICompositeType.
-void Unit::constructTypeDIE(DIE &Buffer, DICompositeType CTy) {
-  // Add name if not anonymous or intermediate type.
-  StringRef Name = CTy.getName();
-
-  uint64_t Size = CTy.getSizeInBits() >> 3;
-  uint16_t Tag = Buffer.getTag();
-
-  switch (Tag) {
-  case dwarf::DW_TAG_array_type:
-    constructArrayTypeDIE(Buffer, CTy);
-    break;
-  case dwarf::DW_TAG_enumeration_type:
-    constructEnumTypeDIE(Buffer, CTy);
-    break;
-  case dwarf::DW_TAG_subroutine_type: {
-    // Add return type. A void return won't have a type.
-    DIArray Elements = CTy.getTypeArray();
-    DIType RTy(Elements.getElement(0));
-    if (RTy)
-      addType(&Buffer, RTy);
-
-    bool isPrototyped = true;
-    // Add arguments.
-    for (unsigned i = 1, N = Elements.getNumElements(); i < N; ++i) {
-      DIDescriptor Ty = Elements.getElement(i);
-      if (Ty.isUnspecifiedParameter()) {
-        createAndAddDIE(dwarf::DW_TAG_unspecified_parameters, Buffer);
-        isPrototyped = false;
-      } else {
-        DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, Buffer);
-        addType(Arg, DIType(Ty));
-        if (DIType(Ty).isArtificial())
-          addFlag(Arg, dwarf::DW_AT_artificial);
-      }
-    }
-    // Add prototype flag if we're dealing with a C language and the
-    // function has been prototyped.
-    uint16_t Language = getLanguage();
-    if (isPrototyped &&
-        (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
-         Language == dwarf::DW_LANG_ObjC))
-      addFlag(&Buffer, dwarf::DW_AT_prototyped);
-  } break;
-  case dwarf::DW_TAG_structure_type:
-  case dwarf::DW_TAG_union_type:
-  case dwarf::DW_TAG_class_type: {
-    // Add elements to structure type.
-    DIArray Elements = CTy.getTypeArray();
-    for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
-      DIDescriptor Element = Elements.getElement(i);
-      DIE *ElemDie = NULL;
-      if (Element.isSubprogram()) {
-        DISubprogram SP(Element);
-        ElemDie = getOrCreateSubprogramDIE(SP);
-        if (SP.isProtected())
-          addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
-                  dwarf::DW_ACCESS_protected);
-        else if (SP.isPrivate())
-          addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
-                  dwarf::DW_ACCESS_private);
-        else
-          addUInt(ElemDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
-                  dwarf::DW_ACCESS_public);
-        if (SP.isExplicit())
-          addFlag(ElemDie, dwarf::DW_AT_explicit);
-      } else if (Element.isDerivedType()) {
-        DIDerivedType DDTy(Element);
-        if (DDTy.getTag() == dwarf::DW_TAG_friend) {
-          ElemDie = createAndAddDIE(dwarf::DW_TAG_friend, Buffer);
-          addType(ElemDie, resolve(DDTy.getTypeDerivedFrom()),
-                  dwarf::DW_AT_friend);
-        } else if (DDTy.isStaticMember()) {
-          getOrCreateStaticMemberDIE(DDTy);
-        } else {
-          constructMemberDIE(Buffer, DDTy);
-        }
-      } else if (Element.isObjCProperty()) {
-        DIObjCProperty Property(Element);
-        ElemDie = createAndAddDIE(Property.getTag(), Buffer);
-        StringRef PropertyName = Property.getObjCPropertyName();
-        addString(ElemDie, dwarf::DW_AT_APPLE_property_name, PropertyName);
-        addType(ElemDie, Property.getType());
-        addSourceLine(ElemDie, Property);
-        StringRef GetterName = Property.getObjCPropertyGetterName();
-        if (!GetterName.empty())
-          addString(ElemDie, dwarf::DW_AT_APPLE_property_getter, GetterName);
-        StringRef SetterName = Property.getObjCPropertySetterName();
-        if (!SetterName.empty())
-          addString(ElemDie, dwarf::DW_AT_APPLE_property_setter, SetterName);
-        unsigned PropertyAttributes = 0;
-        if (Property.isReadOnlyObjCProperty())
-          PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readonly;
-        if (Property.isReadWriteObjCProperty())
-          PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_readwrite;
-        if (Property.isAssignObjCProperty())
-          PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_assign;
-        if (Property.isRetainObjCProperty())
-          PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_retain;
-        if (Property.isCopyObjCProperty())
-          PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_copy;
-        if (Property.isNonAtomicObjCProperty())
-          PropertyAttributes |= dwarf::DW_APPLE_PROPERTY_nonatomic;
-        if (PropertyAttributes)
-          addUInt(ElemDie, dwarf::DW_AT_APPLE_property_attribute, None,
-                  PropertyAttributes);
-
-        DIEEntry *Entry = getDIEEntry(Element);
-        if (!Entry) {
-          Entry = createDIEEntry(ElemDie);
-          insertDIEEntry(Element, Entry);
-        }
-      } else
-        continue;
-    }
-
-    if (CTy.isAppleBlockExtension())
-      addFlag(&Buffer, dwarf::DW_AT_APPLE_block);
-
-    DICompositeType ContainingType(resolve(CTy.getContainingType()));
-    if (ContainingType)
-      addDIEEntry(&Buffer, dwarf::DW_AT_containing_type,
-                  getOrCreateTypeDIE(ContainingType));
-
-    if (CTy.isObjcClassComplete())
-      addFlag(&Buffer, dwarf::DW_AT_APPLE_objc_complete_type);
-
-    // Add template parameters to a class, structure or union types.
-    // FIXME: The support isn't in the metadata for this yet.
-    if (Tag == dwarf::DW_TAG_class_type ||
-        Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type)
-      addTemplateParams(Buffer, CTy.getTemplateParams());
-
-    break;
-  }
-  default:
-    break;
-  }
-
-  // Add name if not anonymous or intermediate type.
-  if (!Name.empty())
-    addString(&Buffer, dwarf::DW_AT_name, Name);
-
-  if (Tag == dwarf::DW_TAG_enumeration_type ||
-      Tag == dwarf::DW_TAG_class_type || Tag == dwarf::DW_TAG_structure_type ||
-      Tag == dwarf::DW_TAG_union_type) {
-    // Add size if non-zero (derived types might be zero-sized.)
-    // TODO: Do we care about size for enum forward declarations?
-    if (Size)
-      addUInt(&Buffer, dwarf::DW_AT_byte_size, None, Size);
-    else if (!CTy.isForwardDecl())
-      // Add zero size if it is not a forward declaration.
-      addUInt(&Buffer, dwarf::DW_AT_byte_size, None, 0);
-
-    // If we're a forward decl, say so.
-    if (CTy.isForwardDecl())
-      addFlag(&Buffer, dwarf::DW_AT_declaration);
-
-    // Add source line info if available.
-    if (!CTy.isForwardDecl())
-      addSourceLine(&Buffer, CTy);
-
-    // No harm in adding the runtime language to the declaration.
-    unsigned RLang = CTy.getRunTimeLang();
-    if (RLang)
-      addUInt(&Buffer, dwarf::DW_AT_APPLE_runtime_class, dwarf::DW_FORM_data1,
-              RLang);
-  }
-}
-
-/// constructTemplateTypeParameterDIE - Construct new DIE for the given
-/// DITemplateTypeParameter.
-void Unit::constructTemplateTypeParameterDIE(DIE &Buffer,
-                                             DITemplateTypeParameter TP) {
-  DIE *ParamDIE =
-      createAndAddDIE(dwarf::DW_TAG_template_type_parameter, Buffer);
-  // Add the type if it exists, it could be void and therefore no type.
-  if (TP.getType())
-    addType(ParamDIE, resolve(TP.getType()));
-  if (!TP.getName().empty())
-    addString(ParamDIE, dwarf::DW_AT_name, TP.getName());
-}
-
-/// constructTemplateValueParameterDIE - Construct new DIE for the given
-/// DITemplateValueParameter.
-void Unit::constructTemplateValueParameterDIE(DIE &Buffer,
-                                              DITemplateValueParameter VP) {
-  DIE *ParamDIE = createAndAddDIE(VP.getTag(), Buffer);
-
-  // Add the type if there is one, template template and template parameter
-  // packs will not have a type.
-  if (VP.getTag() == dwarf::DW_TAG_template_value_parameter)
-    addType(ParamDIE, resolve(VP.getType()));
-  if (!VP.getName().empty())
-    addString(ParamDIE, dwarf::DW_AT_name, VP.getName());
-  if (Value *Val = VP.getValue()) {
-    if (ConstantInt *CI = dyn_cast<ConstantInt>(Val))
-      addConstantValue(ParamDIE, CI,
-                       isUnsignedDIType(DD, resolve(VP.getType())));
-    else if (GlobalValue *GV = dyn_cast<GlobalValue>(Val)) {
-      // For declaration non-type template parameters (such as global values and
-      // functions)
-      DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
-      addOpAddress(Block, Asm->getSymbol(GV));
-      // Emit DW_OP_stack_value to use the address as the immediate value of the
-      // parameter, rather than a pointer to it.
-      addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_stack_value);
-      addBlock(ParamDIE, dwarf::DW_AT_location, Block);
-    } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_template_param) {
-      assert(isa<MDString>(Val));
-      addString(ParamDIE, dwarf::DW_AT_GNU_template_name,
-                cast<MDString>(Val)->getString());
-    } else if (VP.getTag() == dwarf::DW_TAG_GNU_template_parameter_pack) {
-      assert(isa<MDNode>(Val));
-      DIArray A(cast<MDNode>(Val));
-      addTemplateParams(*ParamDIE, A);
-    }
-  }
-}
-
-/// getOrCreateNameSpace - Create a DIE for DINameSpace.
-DIE *Unit::getOrCreateNameSpace(DINameSpace NS) {
-  // Construct the context before querying for the existence of the DIE in case
-  // such construction creates the DIE.
-  DIE *ContextDIE = getOrCreateContextDIE(NS.getContext());
-
-  DIE *NDie = getDIE(NS);
-  if (NDie)
-    return NDie;
-  NDie = createAndAddDIE(dwarf::DW_TAG_namespace, *ContextDIE, NS);
-
-  if (!NS.getName().empty()) {
-    addString(NDie, dwarf::DW_AT_name, NS.getName());
-    addAccelNamespace(NS.getName(), NDie);
-    addGlobalName(NS.getName(), NDie, NS.getContext());
-  } else
-    addAccelNamespace("(anonymous namespace)", NDie);
-  addSourceLine(NDie, NS);
-  return NDie;
-}
-
-/// getOrCreateSubprogramDIE - Create new DIE using SP.
-DIE *Unit::getOrCreateSubprogramDIE(DISubprogram SP) {
-  // Construct the context before querying for the existence of the DIE in case
-  // such construction creates the DIE (as is the case for member function
-  // declarations).
-  DIE *ContextDIE = getOrCreateContextDIE(resolve(SP.getContext()));
-
-  DIE *SPDie = getDIE(SP);
-  if (SPDie)
-    return SPDie;
-
-  DISubprogram SPDecl = SP.getFunctionDeclaration();
-  if (SPDecl.isSubprogram())
-    // Add subprogram definitions to the CU die directly.
-    ContextDIE = CUDie.get();
-
-  // DW_TAG_inlined_subroutine may refer to this DIE.
-  SPDie = createAndAddDIE(dwarf::DW_TAG_subprogram, *ContextDIE, SP);
-
-  DIE *DeclDie = NULL;
-  if (SPDecl.isSubprogram())
-    DeclDie = getOrCreateSubprogramDIE(SPDecl);
-
-  // Add function template parameters.
-  addTemplateParams(*SPDie, SP.getTemplateParams());
-
-  // If this DIE is going to refer declaration info using AT_specification
-  // then there is no need to add other attributes.
-  if (DeclDie) {
-    // Refer function declaration directly.
-    addDIEEntry(SPDie, dwarf::DW_AT_specification, DeclDie);
-
-    return SPDie;
-  }
-
-  // Add the linkage name if we have one.
-  StringRef LinkageName = SP.getLinkageName();
-  if (!LinkageName.empty())
-    addString(SPDie, dwarf::DW_AT_MIPS_linkage_name,
-              GlobalValue::getRealLinkageName(LinkageName));
-
-  // Constructors and operators for anonymous aggregates do not have names.
-  if (!SP.getName().empty())
-    addString(SPDie, dwarf::DW_AT_name, SP.getName());
-
-  addSourceLine(SPDie, SP);
-
-  // Add the prototype if we have a prototype and we have a C like
-  // language.
-  uint16_t Language = getLanguage();
-  if (SP.isPrototyped() &&
-      (Language == dwarf::DW_LANG_C89 || Language == dwarf::DW_LANG_C99 ||
-       Language == dwarf::DW_LANG_ObjC))
-    addFlag(SPDie, dwarf::DW_AT_prototyped);
-
-  DICompositeType SPTy = SP.getType();
-  assert(SPTy.getTag() == dwarf::DW_TAG_subroutine_type &&
-         "the type of a subprogram should be a subroutine");
-
-  DIArray Args = SPTy.getTypeArray();
-  // Add a return type. If this is a type like a C/C++ void type we don't add a
-  // return type.
-  if (Args.getElement(0))
-    addType(SPDie, DIType(Args.getElement(0)));
-
-  unsigned VK = SP.getVirtuality();
-  if (VK) {
-    addUInt(SPDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1, VK);
-    DIEBlock *Block = getDIEBlock();
-    addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
-    addUInt(Block, dwarf::DW_FORM_udata, SP.getVirtualIndex());
-    addBlock(SPDie, dwarf::DW_AT_vtable_elem_location, Block);
-    ContainingTypeMap.insert(
-        std::make_pair(SPDie, resolve(SP.getContainingType())));
-  }
-
-  if (!SP.isDefinition()) {
-    addFlag(SPDie, dwarf::DW_AT_declaration);
-
-    // Add arguments. Do not add arguments for subprogram definition. They will
-    // be handled while processing variables.
-    for (unsigned i = 1, N = Args.getNumElements(); i < N; ++i) {
-      DIE *Arg = createAndAddDIE(dwarf::DW_TAG_formal_parameter, *SPDie);
-      DIType ATy(Args.getElement(i));
-      addType(Arg, ATy);
-      if (ATy.isArtificial())
-        addFlag(Arg, dwarf::DW_AT_artificial);
-    }
-  }
-
-  if (SP.isArtificial())
-    addFlag(SPDie, dwarf::DW_AT_artificial);
-
-  if (!SP.isLocalToUnit())
-    addFlag(SPDie, dwarf::DW_AT_external);
-
-  if (SP.isOptimized())
-    addFlag(SPDie, dwarf::DW_AT_APPLE_optimized);
-
-  if (unsigned isa = Asm->getISAEncoding()) {
-    addUInt(SPDie, dwarf::DW_AT_APPLE_isa, dwarf::DW_FORM_flag, isa);
-  }
-
-  return SPDie;
-}
-
-// Return const expression if value is a GEP to access merged global
-// constant. e.g.
-// i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
-static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
-  const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
-  if (!CE || CE->getNumOperands() != 3 ||
-      CE->getOpcode() != Instruction::GetElementPtr)
-    return NULL;
-
-  // First operand points to a global struct.
-  Value *Ptr = CE->getOperand(0);
-  if (!isa<GlobalValue>(Ptr) ||
-      !isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
-    return NULL;
-
-  // Second operand is zero.
-  const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
-  if (!CI || !CI->isZero())
-    return NULL;
-
-  // Third operand is offset.
-  if (!isa<ConstantInt>(CE->getOperand(2)))
-    return NULL;
-
-  return CE;
-}
-
-/// createGlobalVariableDIE - create global variable DIE.
-void CompileUnit::createGlobalVariableDIE(DIGlobalVariable GV) {
-  // Check for pre-existence.
-  if (getDIE(GV))
-    return;
-
-  if (!GV.isGlobalVariable())
-    return;
-
-  DIScope GVContext = GV.getContext();
-  DIType GTy = GV.getType();
-
-  // If this is a static data member definition, some attributes belong
-  // to the declaration DIE.
-  DIE *VariableDIE = NULL;
-  bool IsStaticMember = false;
-  DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
-  if (SDMDecl.Verify()) {
-    assert(SDMDecl.isStaticMember() && "Expected static member decl");
-    // We need the declaration DIE that is in the static member's class.
-    VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
-    IsStaticMember = true;
-  }
-
-  // If this is not a static data member definition, create the variable
-  // DIE and add the initial set of attributes to it.
-  if (!VariableDIE) {
-    // Construct the context before querying for the existence of the DIE in
-    // case such construction creates the DIE.
-    DIE *ContextDIE = getOrCreateContextDIE(GVContext);
-
-    // Add to map.
-    VariableDIE = createAndAddDIE(GV.getTag(), *ContextDIE, GV);
-
-    // Add name and type.
-    addString(VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
-    addType(VariableDIE, GTy);
-
-    // Add scoping info.
-    if (!GV.isLocalToUnit())
-      addFlag(VariableDIE, dwarf::DW_AT_external);
-
-    // Add line number info.
-    addSourceLine(VariableDIE, GV);
-  }
-
-  // Add location.
-  bool addToAccelTable = false;
-  DIE *VariableSpecDIE = NULL;
-  bool isGlobalVariable = GV.getGlobal() != NULL;
-  if (isGlobalVariable) {
-    addToAccelTable = true;
-    DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
-    const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
-    if (GV.getGlobal()->isThreadLocal()) {
-      // FIXME: Make this work with -gsplit-dwarf.
-      unsigned PointerSize = Asm->getDataLayout().getPointerSize();
-      assert((PointerSize == 4 || PointerSize == 8) &&
-             "Add support for other sizes if necessary");
-      const MCExpr *Expr =
-          Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym);
-      // Based on GCC's support for TLS:
-      if (!DD->useSplitDwarf()) {
-        // 1) Start with a constNu of the appropriate pointer size
-        addUInt(Block, dwarf::DW_FORM_data1,
-                PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
-        // 2) containing the (relocated) offset of the TLS variable
-        //    within the module's TLS block.
-        addExpr(Block, dwarf::DW_FORM_udata, Expr);
-      } else {
-        addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
-        addUInt(Block, dwarf::DW_FORM_udata, DU->getAddrPoolIndex(Expr));
-      }
-      // 3) followed by a custom OP to make the debugger do a TLS lookup.
-      addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
-    } else {
-      DD->addArangeLabel(SymbolCU(this, Sym));
-      addOpAddress(Block, Sym);
-    }
-    // Do not create specification DIE if context is either compile unit
-    // or a subprogram.
-    if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
-        !GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
-      // Create specification DIE.
-      VariableSpecDIE = createAndAddDIE(dwarf::DW_TAG_variable, *CUDie);
-      addDIEEntry(VariableSpecDIE, dwarf::DW_AT_specification, VariableDIE);
-      addBlock(VariableSpecDIE, dwarf::DW_AT_location, Block);
-      // A static member's declaration is already flagged as such.
-      if (!SDMDecl.Verify())
-        addFlag(VariableDIE, dwarf::DW_AT_declaration);
-    } else {
-      addBlock(VariableDIE, dwarf::DW_AT_location, Block);
-    }
-    // Add the linkage name.
-    StringRef LinkageName = GV.getLinkageName();
-    if (!LinkageName.empty())
-      // From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
-      // TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
-      // TAG_variable.
-      addString(IsStaticMember && VariableSpecDIE ? VariableSpecDIE
-                                                  : VariableDIE,
-                dwarf::DW_AT_MIPS_linkage_name,
-                GlobalValue::getRealLinkageName(LinkageName));
-  } else if (const ConstantInt *CI =
-                 dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
-    // AT_const_value was added when the static member was created. To avoid
-    // emitting AT_const_value multiple times, we only add AT_const_value when
-    // it is not a static member.
-    if (!IsStaticMember)
-      addConstantValue(VariableDIE, CI, isUnsignedDIType(DD, GTy));
-  } else if (const ConstantExpr *CE = getMergedGlobalExpr(GV->getOperand(11))) {
-    addToAccelTable = true;
-    // GV is a merged global.
-    DIEBlock *Block = new (DIEValueAllocator) DIEBlock();
-    Value *Ptr = CE->getOperand(0);
-    MCSymbol *Sym = Asm->getSymbol(cast<GlobalValue>(Ptr));
-    DD->addArangeLabel(SymbolCU(this, Sym));
-    addOpAddress(Block, Sym);
-    addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
-    SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
-    addUInt(Block, dwarf::DW_FORM_udata,
-            Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
-    addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
-    addBlock(VariableDIE, dwarf::DW_AT_location, Block);
-  }
-
-  if (addToAccelTable) {
-    DIE *AddrDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
-    addAccelName(GV.getName(), AddrDIE);
-
-    // If the linkage name is different than the name, go ahead and output
-    // that as well into the name table.
-    if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
-      addAccelName(GV.getLinkageName(), AddrDIE);
-  }
-
-  if (!GV.isLocalToUnit())
-    addGlobalName(GV.getName(), VariableSpecDIE ? VariableSpecDIE : VariableDIE,
-                  GV.getContext());
-}
-
-/// constructSubrangeDIE - Construct subrange DIE from DISubrange.
-void Unit::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy) {
-  DIE *DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
-  addDIEEntry(DW_Subrange, dwarf::DW_AT_type, IndexTy);
-
-  // The LowerBound value defines the lower bounds which is typically zero for
-  // C/C++. The Count value is the number of elements.  Values are 64 bit. If
-  // Count == -1 then the array is unbounded and we do not emit
-  // DW_AT_lower_bound and DW_AT_upper_bound attributes. If LowerBound == 0 and
-  // Count == 0, then the array has zero elements in which case we do not emit
-  // an upper bound.
-  int64_t LowerBound = SR.getLo();
-  int64_t DefaultLowerBound = getDefaultLowerBound();
-  int64_t Count = SR.getCount();
-
-  if (DefaultLowerBound == -1 || LowerBound != DefaultLowerBound)
-    addUInt(DW_Subrange, dwarf::DW_AT_lower_bound, None, LowerBound);
-
-  if (Count != -1 && Count != 0)
-    // FIXME: An unbounded array should reference the expression that defines
-    // the array.
-    addUInt(DW_Subrange, dwarf::DW_AT_upper_bound, None,
-            LowerBound + Count - 1);
-}
-
-/// constructArrayTypeDIE - Construct array type DIE from DICompositeType.
-void Unit::constructArrayTypeDIE(DIE &Buffer, DICompositeType CTy) {
-  if (CTy.isVector())
-    addFlag(&Buffer, dwarf::DW_AT_GNU_vector);
-
-  // Emit the element type.
-  addType(&Buffer, resolve(CTy.getTypeDerivedFrom()));
-
-  // Get an anonymous type for index type.
-  // FIXME: This type should be passed down from the front end
-  // as different languages may have different sizes for indexes.
-  DIE *IdxTy = getIndexTyDie();
-  if (!IdxTy) {
-    // Construct an anonymous type for index type.
-    IdxTy = createAndAddDIE(dwarf::DW_TAG_base_type, *CUDie.get());
-    addString(IdxTy, dwarf::DW_AT_name, "int");
-    addUInt(IdxTy, dwarf::DW_AT_byte_size, None, sizeof(int32_t));
-    addUInt(IdxTy, dwarf::DW_AT_encoding, dwarf::DW_FORM_data1,
-            dwarf::DW_ATE_signed);
-    setIndexTyDie(IdxTy);
-  }
-
-  // Add subranges to array type.
-  DIArray Elements = CTy.getTypeArray();
-  for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
-    DIDescriptor Element = Elements.getElement(i);
-    if (Element.getTag() == dwarf::DW_TAG_subrange_type)
-      constructSubrangeDIE(Buffer, DISubrange(Element), IdxTy);
-  }
-}
-
-/// constructEnumTypeDIE - Construct an enum type DIE from DICompositeType.
-void Unit::constructEnumTypeDIE(DIE &Buffer, DICompositeType CTy) {
-  DIArray Elements = CTy.getTypeArray();
-
-  // Add enumerators to enumeration type.
-  for (unsigned i = 0, N = Elements.getNumElements(); i < N; ++i) {
-    DIEnumerator Enum(Elements.getElement(i));
-    if (Enum.isEnumerator()) {
-      DIE *Enumerator = createAndAddDIE(dwarf::DW_TAG_enumerator, Buffer);
-      StringRef Name = Enum.getName();
-      addString(Enumerator, dwarf::DW_AT_name, Name);
-      int64_t Value = Enum.getEnumValue();
-      addSInt(Enumerator, dwarf::DW_AT_const_value, dwarf::DW_FORM_sdata,
-              Value);
-    }
-  }
-  DIType DTy = resolve(CTy.getTypeDerivedFrom());
-  if (DTy) {
-    addType(&Buffer, DTy);
-    addFlag(&Buffer, dwarf::DW_AT_enum_class);
-  }
-}
-
-/// constructContainingTypeDIEs - Construct DIEs for types that contain
-/// vtables.
-void Unit::constructContainingTypeDIEs() {
-  for (DenseMap<DIE *, const MDNode *>::iterator CI = ContainingTypeMap.begin(),
-                                                 CE = ContainingTypeMap.end();
-       CI != CE; ++CI) {
-    DIE *SPDie = CI->first;
-    DIDescriptor D(CI->second);
-    if (!D)
-      continue;
-    DIE *NDie = getDIE(D);
-    if (!NDie)
-      continue;
-    addDIEEntry(SPDie, dwarf::DW_AT_containing_type, NDie);
-  }
-}
-
-/// constructVariableDIE - Construct a DIE for the given DbgVariable.
-DIE *Unit::constructVariableDIE(DbgVariable &DV, bool isScopeAbstract) {
-  StringRef Name = DV.getName();
-
-  // Define variable debug information entry.
-  DIE *VariableDie = new DIE(DV.getTag());
-  DbgVariable *AbsVar = DV.getAbstractVariable();
-  DIE *AbsDIE = AbsVar ? AbsVar->getDIE() : NULL;
-  if (AbsDIE)
-    addDIEEntry(VariableDie, dwarf::DW_AT_abstract_origin, AbsDIE);
-  else {
-    if (!Name.empty())
-      addString(VariableDie, dwarf::DW_AT_name, Name);
-    addSourceLine(VariableDie, DV.getVariable());
-    addType(VariableDie, DV.getType());
-  }
-
-  if (DV.isArtificial())
-    addFlag(VariableDie, dwarf::DW_AT_artificial);
-
-  if (isScopeAbstract) {
-    DV.setDIE(VariableDie);
-    return VariableDie;
-  }
-
-  // Add variable address.
-
-  unsigned Offset = DV.getDotDebugLocOffset();
-  if (Offset != ~0U) {
-    addSectionLabel(VariableDie, dwarf::DW_AT_location,
-                    Asm->GetTempSymbol("debug_loc", Offset));
-    DV.setDIE(VariableDie);
-    return VariableDie;
-  }
-
-  // Check if variable is described by a DBG_VALUE instruction.
-  if (const MachineInstr *DVInsn = DV.getMInsn()) {
-    assert(DVInsn->getNumOperands() == 3);
-    if (DVInsn->getOperand(0).isReg()) {
-      const MachineOperand RegOp = DVInsn->getOperand(0);
-      // If the second operand is an immediate, this is an indirect value.
-      if (DVInsn->getOperand(1).isImm()) {
-        MachineLocation Location(RegOp.getReg(),
-                                 DVInsn->getOperand(1).getImm());
-        addVariableAddress(DV, VariableDie, Location);
-      } else if (RegOp.getReg())
-        addVariableAddress(DV, VariableDie, MachineLocation(RegOp.getReg()));
-    } else if (DVInsn->getOperand(0).isImm())
-      addConstantValue(VariableDie, DVInsn->getOperand(0), DV.getType());
-    else if (DVInsn->getOperand(0).isFPImm())
-      addConstantFPValue(VariableDie, DVInsn->getOperand(0));
-    else if (DVInsn->getOperand(0).isCImm())
-      addConstantValue(VariableDie, DVInsn->getOperand(0).getCImm(),
-                       isUnsignedDIType(DD, DV.getType()));
-
-    DV.setDIE(VariableDie);
-    return VariableDie;
-  } else {
-    // .. else use frame index.
-    int FI = DV.getFrameIndex();
-    if (FI != ~0) {
-      unsigned FrameReg = 0;
-      const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
-      int Offset = TFI->getFrameIndexReference(*Asm->MF, FI, FrameReg);
-      MachineLocation Location(FrameReg, Offset);
-      addVariableAddress(DV, VariableDie, Location);
-    }
-  }
-
-  DV.setDIE(VariableDie);
-  return VariableDie;
-}
-
-/// constructMemberDIE - Construct member DIE from DIDerivedType.
-void Unit::constructMemberDIE(DIE &Buffer, DIDerivedType DT) {
-  DIE *MemberDie = createAndAddDIE(DT.getTag(), Buffer);
-  StringRef Name = DT.getName();
-  if (!Name.empty())
-    addString(MemberDie, dwarf::DW_AT_name, Name);
-
-  addType(MemberDie, resolve(DT.getTypeDerivedFrom()));
-
-  addSourceLine(MemberDie, DT);
-
-  DIEBlock *MemLocationDie = new (DIEValueAllocator) DIEBlock();
-  addUInt(MemLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus_uconst);
-
-  if (DT.getTag() == dwarf::DW_TAG_inheritance && DT.isVirtual()) {
-
-    // For C++, virtual base classes are not at fixed offset. Use following
-    // expression to extract appropriate offset from vtable.
-    // BaseAddr = ObAddr + *((*ObAddr) - Offset)
-
-    DIEBlock *VBaseLocationDie = new (DIEValueAllocator) DIEBlock();
-    addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_dup);
-    addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
-    addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
-    addUInt(VBaseLocationDie, dwarf::DW_FORM_udata, DT.getOffsetInBits());
-    addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_minus);
-    addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_deref);
-    addUInt(VBaseLocationDie, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
-
-    addBlock(MemberDie, dwarf::DW_AT_data_member_location, VBaseLocationDie);
-  } else {
-    uint64_t Size = DT.getSizeInBits();
-    uint64_t FieldSize = getBaseTypeSize(DD, DT);
-    uint64_t OffsetInBytes;
-
-    if (Size != FieldSize) {
-      // Handle bitfield.
-      addUInt(MemberDie, dwarf::DW_AT_byte_size, None,
-              getBaseTypeSize(DD, DT) >> 3);
-      addUInt(MemberDie, dwarf::DW_AT_bit_size, None, DT.getSizeInBits());
-
-      uint64_t Offset = DT.getOffsetInBits();
-      uint64_t AlignMask = ~(DT.getAlignInBits() - 1);
-      uint64_t HiMark = (Offset + FieldSize) & AlignMask;
-      uint64_t FieldOffset = (HiMark - FieldSize);
-      Offset -= FieldOffset;
-
-      // Maybe we need to work from the other end.
-      if (Asm->getDataLayout().isLittleEndian())
-        Offset = FieldSize - (Offset + Size);
-      addUInt(MemberDie, dwarf::DW_AT_bit_offset, None, Offset);
-
-      // Here WD_AT_data_member_location points to the anonymous
-      // field that includes this bit field.
-      OffsetInBytes = FieldOffset >> 3;
-    } else
-      // This is not a bitfield.
-      OffsetInBytes = DT.getOffsetInBits() >> 3;
-    addUInt(MemberDie, dwarf::DW_AT_data_member_location, None, OffsetInBytes);
-  }
-
-  if (DT.isProtected())
-    addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
-            dwarf::DW_ACCESS_protected);
-  else if (DT.isPrivate())
-    addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
-            dwarf::DW_ACCESS_private);
-  // Otherwise C++ member and base classes are considered public.
-  else
-    addUInt(MemberDie, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
-            dwarf::DW_ACCESS_public);
-  if (DT.isVirtual())
-    addUInt(MemberDie, dwarf::DW_AT_virtuality, dwarf::DW_FORM_data1,
-            dwarf::DW_VIRTUALITY_virtual);
-
-  // Objective-C properties.
-  if (MDNode *PNode = DT.getObjCProperty())
-    if (DIEEntry *PropertyDie = getDIEEntry(PNode))
-      MemberDie->addValue(dwarf::DW_AT_APPLE_property, dwarf::DW_FORM_ref4,
-                          PropertyDie);
-
-  if (DT.isArtificial())
-    addFlag(MemberDie, dwarf::DW_AT_artificial);
-}
-
-/// getOrCreateStaticMemberDIE - Create new DIE for C++ static member.
-DIE *Unit::getOrCreateStaticMemberDIE(DIDerivedType DT) {
-  if (!DT.Verify())
-    return NULL;
-
-  // Construct the context before querying for the existence of the DIE in case
-  // such construction creates the DIE.
-  DIE *ContextDIE = getOrCreateContextDIE(resolve(DT.getContext()));
-  assert(dwarf::isType(ContextDIE->getTag()) &&
-         "Static member should belong to a type.");
-
-  DIE *StaticMemberDIE = getDIE(DT);
-  if (StaticMemberDIE)
-    return StaticMemberDIE;
-
-  StaticMemberDIE = createAndAddDIE(DT.getTag(), *ContextDIE, DT);
-
-  DIType Ty = resolve(DT.getTypeDerivedFrom());
-
-  addString(StaticMemberDIE, dwarf::DW_AT_name, DT.getName());
-  addType(StaticMemberDIE, Ty);
-  addSourceLine(StaticMemberDIE, DT);
-  addFlag(StaticMemberDIE, dwarf::DW_AT_external);
-  addFlag(StaticMemberDIE, dwarf::DW_AT_declaration);
-
-  // FIXME: We could omit private if the parent is a class_type, and
-  // public if the parent is something else.
-  if (DT.isProtected())
-    addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
-            dwarf::DW_ACCESS_protected);
-  else if (DT.isPrivate())
-    addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
-            dwarf::DW_ACCESS_private);
-  else
-    addUInt(StaticMemberDIE, dwarf::DW_AT_accessibility, dwarf::DW_FORM_data1,
-            dwarf::DW_ACCESS_public);
-
-  if (const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(DT.getConstant()))
-    addConstantValue(StaticMemberDIE, CI, isUnsignedDIType(DD, Ty));
-  if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT.getConstant()))
-    addConstantFPValue(StaticMemberDIE, CFP);
-
-  return StaticMemberDIE;
-}
-
-void Unit::emitHeader(const MCSection *ASection, const MCSymbol *ASectionSym) {
-  Asm->OutStreamer.AddComment("DWARF version number");
-  Asm->EmitInt16(DD->getDwarfVersion());
-  Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
-  Asm->EmitSectionOffset(Asm->GetTempSymbol(ASection->getLabelBeginName()),
-                         ASectionSym);
-  Asm->OutStreamer.AddComment("Address Size (in bytes)");
-  Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
-}