Initial support for the cfi directives. This is just enough to get

f:
        .cfi_startproc
        nop
        .cfi_endproc

assembled (on ELF).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121434 91177308-0d34-0410-b5e6-96231b3b80d8

19 files changed, 359 insertions, 145 deletions

diff --git a/lib/CodeGen/ELFWriter.cpp b/lib/CodeGen/ELFWriter.cpp
index d14728d8a3..2da6244932 100644
--- a/lib/CodeGen/ELFWriter.cpp
+++ b/lib/CodeGen/ELFWriter.cpp
@@ -45,6 +45,7 @@
 #include "llvm/MC/MCSectionELF.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetELFWriterInfo.h"
 #include "llvm/Target/TargetLowering.h"
@@ -64,7 +65,7 @@ char ELFWriter::ID = 0;
 
 ELFWriter::ELFWriter(raw_ostream &o, TargetMachine &tm)
   : MachineFunctionPass(ID), O(o), TM(tm),
-    OutContext(*new MCContext(*TM.getMCAsmInfo())),
+    OutContext(*new MCContext(*TM.getMCAsmInfo(), new TargetAsmInfo(tm))),
     TLOF(TM.getTargetLowering()->getObjFileLowering()),
     is64Bit(TM.getTargetData()->getPointerSizeInBits() == 64),
     isLittleEndian(TM.getTargetData()->isLittleEndian()),
diff --git a/lib/CodeGen/LLVMTargetMachine.cpp b/lib/CodeGen/LLVMTargetMachine.cpp
index 5954f62da9..af94365218 100644
--- a/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/lib/CodeGen/LLVMTargetMachine.cpp
@@ -24,6 +24,7 @@
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCStreamer.h"
+#include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetRegistry.h"
 #include "llvm/Transforms/Scalar.h"
@@ -145,27 +146,12 @@ bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
     if (ShowMCEncoding)
       MCE = getTarget().createCodeEmitter(*this, *Context);
 
-    const TargetLoweringObjectFile &TLOF =
-      getTargetLowering()->getObjFileLowering();
-    int PointerSize = getTargetData()->getPointerSize();
-
-    MCStreamer *S;
-    if (hasMCUseLoc())
-      S = getTarget().createAsmStreamer(*Context, Out,
-                                        getTargetData()->isLittleEndian(),
-                                        getVerboseAsm(),
-                                        InstPrinter,
-                                        MCE,
-                                        ShowMCInst);
-    else
-      S = createAsmStreamerNoLoc(*Context, Out,
-                                 getTargetData()->isLittleEndian(),
-                                 getVerboseAsm(),
-                                 &TLOF,
-                                 PointerSize,
-                                 InstPrinter,
-                                 MCE,
-                                 ShowMCInst);
+    MCStreamer *S = getTarget().createAsmStreamer(*Context, Out,
+                                                  getVerboseAsm(),
+                                                  hasMCUseLoc(),
+                                                  InstPrinter,
+                                                  MCE,
+                                                  ShowMCInst);
     AsmStreamer.reset(S);
     break;
   }
@@ -344,7 +330,8 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
 
   // Install a MachineModuleInfo class, which is an immutable pass that holds
   // all the per-module stuff we're generating, including MCContext.
-  MachineModuleInfo *MMI = new MachineModuleInfo(*getMCAsmInfo());
+  TargetAsmInfo *TAI = new TargetAsmInfo(*this);
+  MachineModuleInfo *MMI = new MachineModuleInfo(*getMCAsmInfo(), TAI);
   PM.add(MMI);
   OutContext = &MMI->getContext(); // Return the MCContext specifically by-ref.
 
diff --git a/lib/CodeGen/MachineModuleInfo.cpp b/lib/CodeGen/MachineModuleInfo.cpp
index 79622e8df3..fadc594efc 100644
--- a/lib/CodeGen/MachineModuleInfo.cpp
+++ b/lib/CodeGen/MachineModuleInfo.cpp
@@ -253,8 +253,9 @@ void MMIAddrLabelMapCallbackPtr::allUsesReplacedWith(Value *V2) {
 
 //===----------------------------------------------------------------------===//
 
-MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI)
-: ImmutablePass(ID), Context(MAI),
+MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI,
+                                     const TargetAsmInfo *TAI)
+: ImmutablePass(ID), Context(MAI, TAI),
   ObjFileMMI(0),
   CurCallSite(0), CallsEHReturn(0), CallsUnwindInit(0), DbgInfoAvailable(false),
   CallsExternalVAFunctionWithFloatingPointArguments(false) {
@@ -266,7 +267,7 @@ MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI)
 }
 
 MachineModuleInfo::MachineModuleInfo()
-: ImmutablePass(ID), Context(*(MCAsmInfo*)0) {
+: ImmutablePass(ID), Context(*(MCAsmInfo*)0, NULL) {
   assert(0 && "This MachineModuleInfo constructor should never be called, MMI "
          "should always be explicitly constructed by LLVMTargetMachine");
   abort();
diff --git a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 944ed26f54..abc01a2877 100644
--- a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -135,7 +135,7 @@ void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
                                SectionKind::getReadOnly());
   EHFrameSection =
     getContext().getELFSection(".eh_frame", MCSectionELF::SHT_PROGBITS,
-                               MCSectionELF::SHF_ALLOC |MCSectionELF::SHF_WRITE,
+                               MCSectionELF::SHF_ALLOC,
                                SectionKind::getDataRel());
 
   // Debug Info Sections.
diff --git a/lib/MC/MCAsmStreamer.cpp b/lib/MC/MCAsmStreamer.cpp
index ce85e462b3..a1c02208a0 100644
--- a/lib/MC/MCAsmStreamer.cpp
+++ b/lib/MC/MCAsmStreamer.cpp
@@ -24,6 +24,7 @@
 #include "llvm/Support/Format.h"
 #include "llvm/Support/FormattedStream.h"
 #include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetAsmInfo.h"
 using namespace llvm;
 
 namespace {
@@ -37,32 +38,26 @@ class MCAsmStreamer : public MCStreamer {
   SmallString<128> CommentToEmit;
   raw_svector_ostream CommentStream;
 
-  const TargetLoweringObjectFile *TLOF;
-  int PointerSize;
-
-  unsigned IsLittleEndian : 1;
   unsigned IsVerboseAsm : 1;
   unsigned ShowInst : 1;
+  unsigned UseLoc : 1;
 
   bool needsSet(const MCExpr *Value);
 
 public:
   MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
-                bool isLittleEndian, bool isVerboseAsm,
-                const TargetLoweringObjectFile *tlof, int pointerSize,
+                bool isVerboseAsm,
+                bool useLoc,
                 MCInstPrinter *printer, MCCodeEmitter *emitter, bool showInst)
     : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
       InstPrinter(printer), Emitter(emitter), CommentStream(CommentToEmit),
-      TLOF(tlof), PointerSize(pointerSize),
-      IsLittleEndian(isLittleEndian), IsVerboseAsm(isVerboseAsm),
-      ShowInst(showInst) {
+      IsVerboseAsm(isVerboseAsm),
+      ShowInst(showInst), UseLoc(useLoc) {
     if (InstPrinter && IsVerboseAsm)
       InstPrinter->setCommentStream(CommentStream);
   }
   ~MCAsmStreamer() {}
 
-  bool isLittleEndian() const { return IsLittleEndian; }
-
   inline void EmitEOL() {
     // If we don't have any comments, just emit a \n.
     if (!IsVerboseAsm) {
@@ -152,7 +147,8 @@ public:
 
   virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
 
-  virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
+  virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
+                             bool isPCRel, unsigned AddrSpace);
   virtual void EmitIntValue(uint64_t Value, unsigned Size,
                             unsigned AddrSpace = 0);
 
@@ -307,7 +303,8 @@ void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
 void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
                                              const MCSymbol *LastLabel,
                                              const MCSymbol *Label) {
-  EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
+  EmitDwarfSetLineAddr(LineDelta, Label,
+                       getContext().getTargetAsmInfo().getPointerSize());
 }
 
 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
@@ -512,9 +509,10 @@ void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
   EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
 }
 
-void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
-                              unsigned AddrSpace) {
+void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
+                                  bool isPCRel, unsigned AddrSpace) {
   assert(CurSection && "Cannot emit contents before setting section!");
+  assert(!isPCRel && "Cannot emit pc relative relocations!");
   const char *Directive = 0;
   switch (Size) {
   default: break;
@@ -528,7 +526,7 @@ void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
     int64_t IntValue;
     if (!Value->EvaluateAsAbsolute(IntValue))
       report_fatal_error("Don't know how to emit this value.");
-    if (isLittleEndian()) {
+    if (getContext().getTargetAsmInfo().isLittleEndian()) {
       EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
       EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
     } else {
@@ -662,7 +660,7 @@ void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
 }
 
 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
-  if (!TLOF) {
+  if (UseLoc) {
     OS << "\t.file\t" << FileNo << ' ';
     PrintQuotedString(Filename, OS);
     EmitEOL();
@@ -676,7 +674,7 @@ void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
                                           unsigned Discriminator) {
   this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
                                           Isa, Discriminator);
-  if (TLOF)
+  if (!UseLoc)
     return;
 
   OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
@@ -829,7 +827,7 @@ void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
         unsigned Bit = (Code[i] >> j) & 1;
         
         unsigned FixupBit;
-        if (IsLittleEndian)
+        if (getContext().getTargetAsmInfo().isLittleEndian())
           FixupBit = i * 8 + j;
         else
           FixupBit = i * 8 + (7-j);
@@ -855,7 +853,7 @@ void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
   assert(CurSection && "Cannot emit contents before setting section!");
 
-  if (TLOF)
+  if (!UseLoc)
     MCLineEntry::Make(this, getCurrentSection());
 
   // Show the encoding in a comment if we have a code emitter.
@@ -888,28 +886,15 @@ void MCAsmStreamer::EmitRawText(StringRef String) {
 
 void MCAsmStreamer::Finish() {
   // Dump out the dwarf file & directory tables and line tables.
-  if (getContext().hasDwarfFiles() && TLOF)
-    MCDwarfFileTable::Emit(this, TLOF->getDwarfLineSection());
+  if (getContext().hasDwarfFiles() && !UseLoc)
+    MCDwarfFileTable::Emit(this);
 }
 
 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
                                     formatted_raw_ostream &OS,
-                                    bool isLittleEndian,
-                                    bool isVerboseAsm, MCInstPrinter *IP,
+                                    bool isVerboseAsm, bool useLoc,
+                                    MCInstPrinter *IP,
                                     MCCodeEmitter *CE, bool ShowInst) {
-  return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
-                           NULL, 0, IP, CE, ShowInst);
-}
-
-
-MCStreamer *llvm::createAsmStreamerNoLoc(MCContext &Context,
-                                         formatted_raw_ostream &OS,
-                                         bool isLittleEndian,
-                                         bool isVerboseAsm,
-                                         const TargetLoweringObjectFile *TLOF,
-                                         int PointerSize,
-                                         MCInstPrinter *IP,
-                                         MCCodeEmitter *CE, bool ShowInst) {
-  return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
-                           TLOF, PointerSize, IP, CE, ShowInst);
+  return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc,
+                           IP, CE, ShowInst);
 }
diff --git a/lib/MC/MCContext.cpp b/lib/MC/MCContext.cpp
index a1bc9d8b6f..d3a4a27cef 100644
--- a/lib/MC/MCContext.cpp
+++ b/lib/MC/MCContext.cpp
@@ -24,8 +24,9 @@ typedef StringMap<const MCSectionELF*> ELFUniqueMapTy;
 typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy;
 
 
-MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0),
-                     CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0) {
+MCContext::MCContext(const MCAsmInfo &mai, const TargetAsmInfo *tai) :
+  MAI(mai), TAI(tai), NextUniqueID(0),
+  CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0) {
   MachOUniquingMap = 0;
   ELFUniquingMap = 0;
   COFFUniquingMap = 0;
diff --git a/lib/MC/MCDisassembler/EDDisassembler.cpp b/lib/MC/MCDisassembler/EDDisassembler.cpp
index 697b3d9c05..2fd14db2a4 100644
--- a/lib/MC/MCDisassembler/EDDisassembler.cpp
+++ b/lib/MC/MCDisassembler/EDDisassembler.cpp
@@ -354,7 +354,7 @@ int EDDisassembler::parseInst(SmallVectorImpl<MCParsedAsmOperand*> &operands,
   
   SourceMgr sourceMgr;
   sourceMgr.AddNewSourceBuffer(buf, SMLoc()); // ownership of buf handed over
-  MCContext context(*AsmInfo);
+  MCContext context(*AsmInfo, NULL);
   OwningPtr<MCStreamer> streamer(createNullStreamer(context));
   OwningPtr<MCAsmParser> genericParser(createMCAsmParser(*Tgt, sourceMgr,
                                                          context, *streamer,
diff --git a/lib/MC/MCDwarf.cpp b/lib/MC/MCDwarf.cpp
index d7540ce077..c1de31bf06 100644
--- a/lib/MC/MCDwarf.cpp
+++ b/lib/MC/MCDwarf.cpp
@@ -19,6 +19,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/Target/TargetAsmInfo.h"
 using namespace llvm;
 
 // Given a special op, return the address skip amount (in units of
@@ -125,8 +126,7 @@ static inline const MCExpr *MakeStartMinusEndExpr(const MCStreamer &MCOS,
 //
 static inline void EmitDwarfLineTable(MCStreamer *MCOS,
                                       const MCSection *Section,
-                                      const MCLineSection *LineSection,
-                                      const MCSection *DwarfLineSection) {
+                                      const MCLineSection *LineSection) {
   unsigned FileNum = 1;
   unsigned LastLine = 1;
   unsigned Column = 0;
@@ -185,13 +185,15 @@ static inline void EmitDwarfLineTable(MCStreamer *MCOS,
 
   // Switch to the section to be able to create a symbol at its end.
   MCOS->SwitchSection(Section);
+
+  MCContext &context = MCOS->getContext();
   // Create a symbol at the end of the section.
-  MCSymbol *SectionEnd = MCOS->getContext().CreateTempSymbol();
+  MCSymbol *SectionEnd = context.CreateTempSymbol();
   // Set the value of the symbol, as we are at the end of the section.
   MCOS->EmitLabel(SectionEnd);
 
   // Switch back the the dwarf line section.
-  MCOS->SwitchSection(DwarfLineSection);
+  MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection());
 
   MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd);
 }
@@ -199,18 +201,18 @@ static inline void EmitDwarfLineTable(MCStreamer *MCOS,
 //
 // This emits the Dwarf file and the line tables.
 //
-void MCDwarfFileTable::Emit(MCStreamer *MCOS,
-                            const MCSection *DwarfLineSection) {
+void MCDwarfFileTable::Emit(MCStreamer *MCOS) {
+  MCContext &context = MCOS->getContext();
   // Switch to the section where the table will be emitted into.
-  MCOS->SwitchSection(DwarfLineSection);
+  MCOS->SwitchSection(context.getTargetAsmInfo().getDwarfLineSection());
 
   // Create a symbol at the beginning of this section.
-  MCSymbol *LineStartSym = MCOS->getContext().CreateTempSymbol();
+  MCSymbol *LineStartSym = context.CreateTempSymbol();
   // Set the value of the symbol, as we are at the start of the section.
   MCOS->EmitLabel(LineStartSym);
 
   // Create a symbol for the end of the section (to be set when we get there).
-  MCSymbol *LineEndSym = MCOS->getContext().CreateTempSymbol();
+  MCSymbol *LineEndSym = context.CreateTempSymbol();
 
   // The first 4 bytes is the total length of the information for this
   // compilation unit (not including these 4 bytes for the length).
@@ -221,7 +223,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS,
   MCOS->EmitIntValue(2, 2);
 
   // Create a symbol for the end of the prologue (to be set when we get there).
-  MCSymbol *ProEndSym = MCOS->getContext().CreateTempSymbol(); // Lprologue_end
+  MCSymbol *ProEndSym = context.CreateTempSymbol(); // Lprologue_end
 
   // Length of the prologue, is the next 4 bytes.  Which is the start of the
   // section to the end of the prologue.  Not including the 4 bytes for the
@@ -256,7 +258,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS,
 
   // First the directory table.
   const std::vector<StringRef> &MCDwarfDirs =
-    MCOS->getContext().getMCDwarfDirs();
+    context.getMCDwarfDirs();
   for (unsigned i = 0; i < MCDwarfDirs.size(); i++) {
     MCOS->EmitBytes(MCDwarfDirs[i], 0); // the DirectoryName
     MCOS->EmitBytes(StringRef("\0", 1), 0); // the null term. of the string
@@ -290,7 +292,7 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS,
        ++it) {
     const MCSection *Sec = *it;
     const MCLineSection *Line = MCLineSections.lookup(Sec);
-    EmitDwarfLineTable(MCOS, Sec, Line, DwarfLineSection);
+    EmitDwarfLineTable(MCOS, Sec, Line);
 
     // Now delete the MCLineSections that were created in MCLineEntry::Make()
     // and used to emit the line table.
@@ -425,3 +427,187 @@ void MCDwarfFile::dump() const {
   print(dbgs());
 }
 
+static int getDataAlignmentFactor(MCStreamer &streamer) {
+  MCContext &context = streamer.getContext();
+  const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
+  int size = asmInfo.getPointerSize();
+  if (asmInfo.getStackGrowthDirection() == TargetFrameInfo::StackGrowsUp)
+    return size;
+ else
+   return -size;
+}
+
+/// EmitFrameMoves - Emit frame instructions to describe the layout of the
+/// frame.
+static void EmitFrameMoves(MCStreamer &streamer,
+                           const std::vector<MachineMove> &Moves,
+                           MCSymbol *BaseLabel, bool isEH) {
+  MCContext &context = streamer.getContext();
+  const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
+  int dataAlignmentFactor = getDataAlignmentFactor(streamer);
+
+  for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
+    const MachineMove &Move = Moves[i];
+    MCSymbol *Label = Move.getLabel();
+    // Throw out move if the label is invalid.
+    if (Label && !Label->isDefined()) continue; // Not emitted, in dead code.
+
+    const MachineLocation &Dst = Move.getDestination();
+    const MachineLocation &Src = Move.getSource();
+
+    // Advance row if new location.
+    if (BaseLabel && Label) {
+      MCSymbol *ThisSym = Label;
+      if (ThisSym != BaseLabel) {
+        streamer.EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
+        const MCExpr *Length = MakeStartMinusEndExpr(streamer, *BaseLabel,
+                                                     *ThisSym, 4);
+        streamer.EmitValue(Length, 4);
+        BaseLabel = ThisSym;
+      }
+    }
+
+    // If advancing cfa.
+    if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
+      assert(!Src.isReg() && "Machine move not supported yet.");
+
+      if (Src.getReg() == MachineLocation::VirtualFP) {
+        streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1);
+      } else {
+        streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1);
+        streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Src.getReg(), isEH),
+                                     1);
+      }
+
+      streamer.EmitULEB128IntValue(-Src.getOffset(), 1);
+      continue;
+    }
+
+    if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
+      assert(Dst.isReg() && "Machine move not supported yet.");
+      streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1);
+      streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Dst.getReg(), isEH));
+      continue;
+    }
+
+    unsigned Reg = asmInfo.getDwarfRegNum(Src.getReg(), isEH);
+    int Offset = Dst.getOffset() / dataAlignmentFactor;
+
+    if (Offset < 0) {
+      streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1);
+      streamer.EmitULEB128IntValue(Reg);
+      streamer.EmitSLEB128IntValue(Offset);
+    } else if (Reg < 64) {
+      streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1);
+      streamer.EmitULEB128IntValue(Offset, 1);
+    } else {
+      streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1);
+      streamer.EmitULEB128IntValue(Reg, 1);
+      streamer.EmitULEB128IntValue(Offset, 1);
+    }
+  }
+}
+
+static const MCSymbol &EmitCIE(MCStreamer &streamer) {
+  MCContext &context = streamer.getContext();
+  const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
+  const MCSection &section = *asmInfo.getEHFrameSection();
+  streamer.SwitchSection(&section);
+  MCSymbol *sectionStart = streamer.getContext().CreateTempSymbol();
+  MCSymbol *sectionEnd = streamer.getContext().CreateTempSymbol();
+
+  // Length
+  const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart,
+                                               *sectionEnd, 4);
+  streamer.EmitLabel(sectionStart);
+  streamer.EmitValue(Length, 4);
+
+  // CIE ID
+  streamer.EmitIntValue(0, 4);
+
+  // Version
+  streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1);
+
+  // Augmentation String
+  SmallString<8> Augmentation;
+  Augmentation += "zR";
+  streamer.EmitBytes(Augmentation.str(), 0);
+  streamer.EmitIntValue(0, 1);
+
+  // Code Alignment Factor
+  streamer.EmitULEB128IntValue(1);
+
+  // Data Alignment Factor
+  streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer));
+
+  // Return Address Register
+  streamer.EmitULEB128IntValue(asmInfo.getDwarfRARegNum(true));
+
+  // Augmentation Data Length (optional)
+  MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol();
+  MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol();
+  const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer,
+                                                           *augmentationStart,
+                                                           *augmentationEnd, 0);
+  streamer.EmitULEB128Value(augmentationLength);
+
+  // Augmentation Data (optional)
+  streamer.EmitLabel(augmentationStart);
+  streamer.EmitIntValue(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4, 1);
+  streamer.EmitLabel(augmentationEnd);
+
+  // Initial Instructions
+
+  const std::vector<MachineMove> Moves = asmInfo.getInitialFrameState();
+
+  EmitFrameMoves(streamer, Moves, NULL, true);
+
+  // Padding
+  streamer.EmitValueToAlignment(asmInfo.getPointerSize());
+
+  streamer.EmitLabel(sectionEnd);
+  return *sectionStart;
+}
+
+static void EmitFDE(MCStreamer &streamer,
+                    const MCSymbol &cieStart,
+                    const MCDwarfFrameInfo &frame) {
+  MCContext &context = streamer.getContext();
+  const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
+  MCSymbol *fdeStart = streamer.getContext().CreateTempSymbol();
+  MCSymbol *fdeEnd = streamer.getContext().CreateTempSymbol();
+
+  // Length
+  const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0);
+  streamer.EmitValue(Length, 4);
+
+  streamer.EmitLabel(fdeStart);
+  // CIE Pointer
+  const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart,
+                                               0);
+  streamer.EmitValue(offset, 4);
+
+  // PC Begin
+  streamer.EmitPCRelSymbolValue(frame.Begin, 4);
+
+  // PC Range
+  const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin,
+                                              *frame.End, 0);
+  streamer.EmitValue(Range, 4);
+
+  // Augmentation Data Length
+  streamer.EmitULEB128IntValue(0);
+
+  // Augmentation Data
+  // Call Frame Instructions
+
+  // Padding
+  streamer.EmitValueToAlignment(asmInfo.getPointerSize());
+  streamer.EmitLabel(fdeEnd);
+}
+
+void MCDwarfFrameEmitter::Emit(MCStreamer &streamer) {
+  const MCSymbol &cieStart = EmitCIE(streamer);
+  for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i)
+    EmitFDE(streamer, cieStart, streamer.getFrameInfo(i));
+}
diff --git a/lib/MC/MCELFStreamer.cpp b/lib/MC/MCELFStreamer.cpp
index 18d8fa39ed..6900b247ce 100644
--- a/lib/MC/MCELFStreamer.cpp
+++ b/lib/MC/MCELFStreamer.cpp
@@ -30,6 +30,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/Target/TargetAsmInfo.h"
 
 using namespace llvm;
 
@@ -478,14 +479,8 @@ void MCELFStreamer::EmitInstToData(const MCInst &Inst) {
 }
 
 void MCELFStreamer::Finish() {
-  // FIXME: duplicated code with the MachO streamer.
-  // Dump out the dwarf file & directory tables and line tables.
-  if (getContext().hasDwarfFiles()) {
-    const MCSection *DwarfLineSection =
-      getContext().getELFSection(".debug_line", 0, 0,
-                                 SectionKind::getDataRelLocal());
-    MCDwarfFileTable::Emit(this, DwarfLineSection);
-  }
+  if (!FrameInfos.empty())
+    MCDwarfFrameEmitter::Emit(*this);
 
   for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),
                                                 e = LocalCommons.end();
diff --git a/lib/MC/MCLoggingStreamer.cpp b/lib/MC/MCLoggingStreamer.cpp
index 134554b800..d947481383 100644
--- a/lib/MC/MCLoggingStreamer.cpp
+++ b/lib/MC/MCLoggingStreamer.cpp
@@ -154,9 +154,10 @@ public:
     return Child->EmitBytes(Data, AddrSpace);
   }
 
-  virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace){
+  virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
+                             bool isPCRel, unsigned AddrSpace){
     LogCall("EmitValue");
-    return Child->EmitValue(Value, Size, AddrSpace);
+    return Child->EmitValueImpl(Value, Size, isPCRel, AddrSpace);
   }
 
   virtual void EmitULEB128Value(const MCExpr *Value,
diff --git a/lib/MC/MCMachOStreamer.cpp b/lib/MC/MCMachOStreamer.cpp
index 47060234b3..df1e7d8e2b 100644
--- a/lib/MC/MCMachOStreamer.cpp
+++ b/lib/MC/MCMachOStreamer.cpp
@@ -24,6 +24,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/Target/TargetAsmInfo.h"
 
 using namespace llvm;
 
@@ -354,15 +355,6 @@ void MCMachOStreamer::EmitInstToData(const MCInst &Inst) {
 }
 
 void MCMachOStreamer::Finish() {
-  // Dump out the dwarf file & directory tables and line tables.
-  if (getContext().hasDwarfFiles()) {
-    const MCSection *DwarfLineSection = getContext().getMachOSection("__DWARF",
-                                         "__debug_line",
-                                         MCSectionMachO::S_ATTR_DEBUG,
-                                         0, SectionKind::getDataRelLocal());
-    MCDwarfFileTable::Emit(this, DwarfLineSection);
-  }
-
   // We have to set the fragment atom associations so we can relax properly for
   // Mach-O.
 
diff --git a/lib/MC/MCNullStreamer.cpp b/lib/MC/MCNullStreamer.cpp
index c8f9c63617..b9393ffd2e 100644
--- a/lib/MC/MCNullStreamer.cpp
+++ b/lib/MC/MCNullStreamer.cpp
@@ -68,8 +68,8 @@ namespace {
                                 uint64_t Size, unsigned ByteAlignment) {}
     virtual void EmitBytes(StringRef Data, unsigned AddrSpace) {}
 
-    virtual void EmitValue(const MCExpr *Value, unsigned Size,
-                           unsigned AddrSpace) {}
+    virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
+                               bool isPCRel, unsigned AddrSpace) {}
     virtual void EmitULEB128Value(const MCExpr *Value,
                                   unsigned AddrSpace = 0) {}
     virtual void EmitSLEB128Value(const MCExpr *Value,
diff --git a/lib/MC/MCObjectStreamer.cpp b/lib/MC/MCObjectStreamer.cpp
index 683f2c6adc..7d3006a712 100644
--- a/lib/MC/MCObjectStreamer.cpp
+++ b/lib/MC/MCObjectStreamer.cpp
@@ -12,10 +12,12 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCDwarf.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/Target/TargetAsmInfo.h"
 using namespace llvm;
 
 MCObjectStreamer::MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
@@ -74,8 +76,8 @@ const MCExpr *MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
   return Value;
 }
 
-void MCObjectStreamer::EmitValue(const MCExpr *Value, unsigned Size,
-                                 unsigned AddrSpace) {
+void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
+                                     bool isPCRel, unsigned AddrSpace) {
   assert(AddrSpace == 0 && "Address space must be 0!");
   MCDataFragment *DF = getOrCreateDataFragment();
 
@@ -87,7 +89,7 @@ void MCObjectStreamer::EmitValue(const MCExpr *Value, unsigned Size,
   }
   DF->addFixup(MCFixup::Create(DF->getContents().size(),
                                AddValueSymbols(Value),
-                               MCFixup::getKindForSize(Size, false)));
+                               MCFixup::getKindForSize(Size, isPCRel)));
   DF->getContents().resize(DF->getContents().size() + Size, 0);
 }
 
@@ -189,7 +191,7 @@ void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
                                                 const MCSymbol *LastLabel,
                                                 const MCSymbol *Label) {
   if (!LastLabel) {
-    int PointerSize = getAssembler().getBackend().getPointerSize();
+    int PointerSize = getContext().getTargetAsmInfo().getPointerSize();
     EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
     return;
   }
@@ -215,5 +217,9 @@ void MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
 }
 
 void MCObjectStreamer::Finish() {
+  // Dump out the dwarf file & directory tables and line tables.
+  if (getContext().hasDwarfFiles())
+    MCDwarfFileTable::Emit(this);
+
   getAssembler().Finish();
 }
diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp
index e003a953ad..6f9692d227 100644
--- a/lib/MC/MCStreamer.cpp
+++ b/lib/MC/MCStreamer.cpp
@@ -85,9 +85,31 @@ void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size,
   EmitSymbolValue(ABS, Size, AddrSpace);
 }
 
+
+void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
+                           unsigned AddrSpace) {
+  EmitValueImpl(Value, Size, false, AddrSpace);
+}
+
+void MCStreamer::EmitPCRelValue(const MCExpr *Value, unsigned Size,
+                                unsigned AddrSpace) {
+  EmitValueImpl(Value, Size, true, AddrSpace);
+}