X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCStreamer.cpp;h=1ae1d51f2a32dc2de5528aa8d39afe0c5bdb9a37;hb=75af6938b24f1fd6c2db9f52d5b1fdc3164dcfc2;hp=0a69dab0b1f6995b894a2dc49b315c3d4cee577b;hpb=ac9f143a696f5d17bb97aee2230de67c002105b2;p=oota-llvm.git

diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp
index 0a69dab0b1f..1ae1d51f2a3 100644
--- a/lib/MC/MCStreamer.cpp
+++ b/lib/MC/MCStreamer.cpp
@@ -14,9 +14,13 @@
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstPrinter.h"
 #include "llvm/MC/MCObjectFileInfo.h"
 #include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCWin64EH.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/LEB128.h"
 #include "llvm/Support/raw_ostream.h"
@@ -34,52 +38,29 @@ void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
 
 void MCTargetStreamer::finish() {}
 
+void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
+
 MCStreamer::MCStreamer(MCContext &Ctx)
-    : Context(Ctx), EmitEHFrame(true), EmitDebugFrame(false),
-      CurrentW64UnwindInfo(0), LastSymbol(0) {
+    : Context(Ctx), CurrentWinFrameInfo(nullptr) {
   SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
 }
 
 MCStreamer::~MCStreamer() {
-  for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
-    delete W64UnwindInfos[i];
+  for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
+    delete WinFrameInfos[i];
 }
 
 void MCStreamer::reset() {
-  for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i)
-    delete W64UnwindInfos[i];
-  W64UnwindInfos.clear();
-  EmitEHFrame = true;
-  EmitDebugFrame = false;
-  CurrentW64UnwindInfo = 0;
-  LastSymbol = 0;
+  DwarfFrameInfos.clear();
+  for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
+    delete WinFrameInfos[i];
+  WinFrameInfos.clear();
+  CurrentWinFrameInfo = nullptr;
+  SymbolOrdering.clear();
   SectionStack.clear();
   SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
 }
 
-const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
-                                          const MCSymbol *A,
-                                          const MCSymbol *B) {
-  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
-  const MCExpr *ARef =
-    MCSymbolRefExpr::Create(A, Variant, Context);
-  const MCExpr *BRef =
-    MCSymbolRefExpr::Create(B, Variant, Context);
-  const MCExpr *AddrDelta =
-    MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
-  return AddrDelta;
-}
-
-const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
-  if (Context.getAsmInfo()->hasAggressiveSymbolFolding() ||
-      isa<MCSymbolRefExpr>(Expr))
-    return Expr;
-
-  MCSymbol *ABS = Context.CreateTempSymbol();
-  EmitAssignment(ABS, Expr);
-  return MCSymbolRefExpr::Create(ABS, Context);
-}
-
 raw_ostream &MCStreamer::GetCommentOS() {
   // By default, discard comments.
   return nulls();
@@ -88,28 +69,15 @@ raw_ostream &MCStreamer::GetCommentOS() {
 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
 
 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
-  for (std::vector<MCDwarfFrameInfo>::iterator I = FrameInfos.begin(),
-         E = FrameInfos.end(); I != E; ++I)
-    I->CompactUnwindEncoding =
-      (MAB ? MAB->generateCompactUnwindEncoding(I->Instructions) : 0);
-}
-
-void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
-                                      const MCSymbol *Label, int PointerSize) {
-  // emit the sequence to set the address
-  EmitIntValue(dwarf::DW_LNS_extended_op, 1);
-  EmitULEB128IntValue(PointerSize + 1);
-  EmitIntValue(dwarf::DW_LNE_set_address, 1);
-  EmitSymbolValue(Label, PointerSize);
-
-  // emit the sequence for the LineDelta (from 1) and a zero address delta.
-  MCDwarfLineAddr::Emit(this, LineDelta, 0);
+  for (auto &FI : DwarfFrameInfos)
+    FI.CompactUnwindEncoding =
+        (MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
 }
 
 /// EmitIntValue - Special case of EmitValue that avoids the client having to
 /// pass in a MCExpr for constant integers.
 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
-  assert(Size <= 8 && "Invalid size");
+  assert(1 <= Size && Size <= 8 && "Invalid size");
   assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
          "Invalid size");
   char buf[8];
@@ -139,18 +107,19 @@ void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
   EmitBytes(OSE.str());
 }
 
-void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
-  const MCExpr *ABS = ForceExpAbs(Value);
-  EmitValue(ABS, Size);
+void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, SMLoc Loc) {
+  EmitValueImpl(Value, Size, Loc);
 }
 
+void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
+                                 bool IsSectionRelative) {
+  assert((!IsSectionRelative || Size == 4) &&
+         "SectionRelative value requires 4-bytes");
 
-void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size) {
-  EmitValueImpl(Value, Size);
-}
-
-void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size) {
-  EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
+  if (!IsSectionRelative)
+    EmitValueImpl(MCSymbolRefExpr::create(Sym, getContext()), Size);
+  else
+    EmitCOFFSecRel32(Sym);
 }
 
 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
@@ -164,7 +133,7 @@ void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
 /// EmitFill - Emit NumBytes bytes worth of the value specified by
 /// FillValue.  This implements directives such as '.space'.
 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
-  const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
+  const MCExpr *E = MCConstantExpr::create(FillValue, getContext());
   for (uint64_t i = 0, e = NumBytes; i != e; ++i)
     EmitValue(E, 1);
 }
@@ -174,10 +143,10 @@ void MCStreamer::EmitZeros(uint64_t NumBytes) {
   EmitFill(NumBytes, 0);
 }
 
-bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
-                                        StringRef Directory,
-                                        StringRef Filename, unsigned CUID) {
-  return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID) == 0;
+unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
+                                            StringRef Directory,
+                                            StringRef Filename, unsigned CUID) {
+  return getContext().getDwarfFile(Directory, Filename, FileNo, CUID);
 }
 
 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
@@ -189,14 +158,24 @@ void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
                                   Discriminator);
 }
 
-MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() {
-  if (FrameInfos.empty())
-    return 0;
-  return &FrameInfos.back();
+MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
+  MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
+  if (!Table.getLabel()) {
+    StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
+    Table.setLabel(
+        Context.getOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
+  }
+  return Table.getLabel();
 }
 
-void MCStreamer::EnsureValidFrame() {
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
+  if (DwarfFrameInfos.empty())
+    return nullptr;
+  return &DwarfFrameInfos.back();
+}
+
+void MCStreamer::EnsureValidDwarfFrame() {
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   if (!CurFrame || CurFrame->End)
     report_fatal_error("No open frame");
 }
@@ -205,15 +184,13 @@ void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
                                      MCSymbol *EHSymbol) {
 }
 
-void MCStreamer::InitSections(bool Force) {
+void MCStreamer::InitSections(bool NoExecStack) {
   SwitchSection(getContext().getObjectFileInfo()->getTextSection());
 }
 
-void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
-  if (Section)
-    Symbol->setSection(*Section);
-  else
-    Symbol->setUndefined();
+void MCStreamer::AssignFragment(MCSymbol *Symbol, MCFragment *Fragment) {
+  assert(Fragment);
+  Symbol->setFragment(Fragment);
 
   // As we emit symbols into a section, track the order so that they can
   // be sorted upon later. Zero is reserved to mean 'unemitted'.
@@ -223,35 +200,20 @@ void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
   assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
   assert(getCurrentSection().first && "Cannot emit before setting section!");
-  AssignSection(Symbol, getCurrentSection().first);
-  LastSymbol = Symbol;
+  assert(!Symbol->getFragment() && "Unexpected fragment on symbol data!");
+  Symbol->setFragment(&getCurrentSectionOnly()->getDummyFragment());
 
   MCTargetStreamer *TS = getTargetStreamer();
   if (TS)
     TS->emitLabel(Symbol);
 }
 
-void MCStreamer::EmitDebugLabel(MCSymbol *Symbol) {
-  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
-  assert(getCurrentSection().first && "Cannot emit before setting section!");
-  AssignSection(Symbol, getCurrentSection().first);
-  LastSymbol = Symbol;
-}
-
-void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
-  EnsureValidFrame();
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
-  CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
-}
-
 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
   assert(EH || Debug);
-  EmitEHFrame = EH;
-  EmitDebugFrame = Debug;
 }
 
 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   if (CurFrame && !CurFrame->End)
     report_fatal_error("Starting a frame before finishing the previous one!");
 
@@ -259,42 +221,37 @@ void MCStreamer::EmitCFIStartProc(bool IsSimple) {
   Frame.IsSimple = IsSimple;
   EmitCFIStartProcImpl(Frame);
 
-  FrameInfos.push_back(Frame);
-}
+  const MCAsmInfo* MAI = Context.getAsmInfo();
+  if (MAI) {
+    for (const MCCFIInstruction& Inst : MAI->getInitialFrameState()) {
+      if (Inst.getOperation() == MCCFIInstruction::OpDefCfa ||
+          Inst.getOperation() == MCCFIInstruction::OpDefCfaRegister) {
+        Frame.CurrentCfaRegister = Inst.getRegister();
+      }
+    }
+  }
 
-void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
+  DwarfFrameInfos.push_back(Frame);
 }
 
-void MCStreamer::RecordProcStart(MCDwarfFrameInfo &Frame) {
-  Frame.Function = LastSymbol;
-  // If the function is externally visible, we need to create a local
-  // symbol to avoid relocations.
-  StringRef Prefix = getContext().getAsmInfo()->getPrivateGlobalPrefix();
-  if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
-    Frame.Begin = LastSymbol;
-  } else {
-    Frame.Begin = getContext().CreateTempSymbol();
-    EmitLabel(Frame.Begin);
-  }
+void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
 }
 
 void MCStreamer::EmitCFIEndProc() {
-  EnsureValidFrame();
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  EnsureValidDwarfFrame();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   EmitCFIEndProcImpl(*CurFrame);
 }
 
 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
-}
-
-void MCStreamer::RecordProcEnd(MCDwarfFrameInfo &Frame) {
-  Frame.End = getContext().CreateTempSymbol();
-  EmitLabel(Frame.End);
+  // Put a dummy non-null value in Frame.End to mark that this frame has been
+  // closed.
+  Frame.End = (MCSymbol *) 1;
 }
 
 MCSymbol *MCStreamer::EmitCFICommon() {
-  EnsureValidFrame();
-  MCSymbol *Label = getContext().CreateTempSymbol();
+  EnsureValidDwarfFrame();
+  MCSymbol *Label = getContext().createTempSymbol();
   EmitLabel(Label);
   return Label;
 }
@@ -303,15 +260,16 @@ void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createDefCfa(Label, Register, Offset);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
+  CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
 }
 
 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createDefCfaOffset(Label, Offset);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
@@ -319,7 +277,7 @@ void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
@@ -327,15 +285,16 @@ void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createDefCfaRegister(Label, Register);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
+  CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
 }
 
 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createOffset(Label, Register, Offset);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
@@ -343,21 +302,21 @@ void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createRelOffset(Label, Register, Offset);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
                                     unsigned Encoding) {
-  EnsureValidFrame();
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  EnsureValidDwarfFrame();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Personality = Sym;
   CurFrame->PersonalityEncoding = Encoding;
 }
 
 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
-  EnsureValidFrame();
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  EnsureValidDwarfFrame();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Lsda = Sym;
   CurFrame->LsdaEncoding = Encoding;
 }
@@ -365,7 +324,7 @@ void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
 void MCStreamer::EmitCFIRememberState() {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
@@ -373,7 +332,7 @@ void MCStreamer::EmitCFIRestoreState() {
   // FIXME: Error if there is no matching cfi_remember_state.
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
@@ -381,7 +340,7 @@ void MCStreamer::EmitCFISameValue(int64_t Register) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createSameValue(Label, Register);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
@@ -389,20 +348,28 @@ void MCStreamer::EmitCFIRestore(int64_t Register) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createRestore(Label, Register);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
 void MCStreamer::EmitCFIEscape(StringRef Values) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
+  CurFrame->Instructions.push_back(Instruction);
+}
+
+void MCStreamer::EmitCFIGnuArgsSize(int64_t Size) {
+  MCSymbol *Label = EmitCFICommon();
+  MCCFIInstruction Instruction = 
+    MCCFIInstruction::createGnuArgsSize(Label, Size);
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
 void MCStreamer::EmitCFISignalFrame() {
-  EnsureValidFrame();
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  EnsureValidDwarfFrame();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->IsSignalFrame = true;
 }
 
@@ -410,7 +377,7 @@ void MCStreamer::EmitCFIUndefined(int64_t Register) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createUndefined(Label, Register);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
@@ -418,7 +385,7 @@ void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createRegister(Label, Register1, Register2);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
@@ -426,168 +393,184 @@ void MCStreamer::EmitCFIWindowSave() {
   MCSymbol *Label = EmitCFICommon();
   MCCFIInstruction Instruction =
     MCCFIInstruction::createWindowSave(Label);
-  MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
   CurFrame->Instructions.push_back(Instruction);
 }
 
-void MCStreamer::setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame) {
-  W64UnwindInfos.push_back(Frame);
-  CurrentW64UnwindInfo = W64UnwindInfos.back();
-}
-
-void MCStreamer::EnsureValidW64UnwindInfo() {
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  if (!CurFrame || CurFrame->End)
+void MCStreamer::EnsureValidWinFrameInfo() {
+  const MCAsmInfo *MAI = Context.getAsmInfo();
+  if (!MAI->usesWindowsCFI())
+    report_fatal_error(".seh_* directives are not supported on this target");
+  if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
     report_fatal_error("No open Win64 EH frame function!");
 }
 
-void MCStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  if (CurFrame && !CurFrame->End)
+void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
+  const MCAsmInfo *MAI = Context.getAsmInfo();
+  if (!MAI->usesWindowsCFI())
+    report_fatal_error(".seh_* directives are not supported on this target");
+  if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
     report_fatal_error("Starting a function before ending the previous one!");
-  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
-  Frame->Begin = getContext().CreateTempSymbol();
-  Frame->Function = Symbol;
-  EmitLabel(Frame->Begin);
-  setCurrentW64UnwindInfo(Frame);
+
+  MCSymbol *StartProc = getContext().createTempSymbol();
+  EmitLabel(StartProc);
+
+  WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));
+  CurrentWinFrameInfo = WinFrameInfos.back();
 }
 
-void MCStreamer::EmitWin64EHEndProc() {
-  EnsureValidW64UnwindInfo();
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  if (CurFrame->ChainedParent)
+void MCStreamer::EmitWinCFIEndProc() {
+  EnsureValidWinFrameInfo();
+  if (CurrentWinFrameInfo->ChainedParent)
     report_fatal_error("Not all chained regions terminated!");
-  CurFrame->End = getContext().CreateTempSymbol();
-  EmitLabel(CurFrame->End);
+
+  MCSymbol *Label = getContext().createTempSymbol();
+  EmitLabel(Label);
+  CurrentWinFrameInfo->End = Label;
 }
 
-void MCStreamer::EmitWin64EHStartChained() {
-  EnsureValidW64UnwindInfo();
-  MCWin64EHUnwindInfo *Frame = new MCWin64EHUnwindInfo;
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  Frame->Begin = getContext().CreateTempSymbol();
-  Frame->Function = CurFrame->Function;
-  Frame->ChainedParent = CurFrame;
-  EmitLabel(Frame->Begin);
-  setCurrentW64UnwindInfo(Frame);
+void MCStreamer::EmitWinCFIStartChained() {
+  EnsureValidWinFrameInfo();
+
+  MCSymbol *StartProc = getContext().createTempSymbol();
+  EmitLabel(StartProc);
+
+  WinFrameInfos.push_back(new WinEH::FrameInfo(CurrentWinFrameInfo->Function,
+                                               StartProc, CurrentWinFrameInfo));
+  CurrentWinFrameInfo = WinFrameInfos.back();
 }
 
-void MCStreamer::EmitWin64EHEndChained() {
-  EnsureValidW64UnwindInfo();
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  if (!CurFrame->ChainedParent)
+void MCStreamer::EmitWinCFIEndChained() {
+  EnsureValidWinFrameInfo();
+  if (!CurrentWinFrameInfo->ChainedParent)
     report_fatal_error("End of a chained region outside a chained region!");
-  CurFrame->End = getContext().CreateTempSymbol();
-  EmitLabel(CurFrame->End);
-  CurrentW64UnwindInfo = CurFrame->ChainedParent;
+
+  MCSymbol *Label = getContext().createTempSymbol();
+  EmitLabel(Label);
+
+  CurrentWinFrameInfo->End = Label;
+  CurrentWinFrameInfo =
+      const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->ChainedParent);
 }
 
-void MCStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
-                                    bool Except) {
-  EnsureValidW64UnwindInfo();
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  if (CurFrame->ChainedParent)
+void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
+                                  bool Except) {
+  EnsureValidWinFrameInfo();
+  if (CurrentWinFrameInfo->ChainedParent)
     report_fatal_error("Chained unwind areas can't have handlers!");
-  CurFrame->ExceptionHandler = Sym;
+  CurrentWinFrameInfo->ExceptionHandler = Sym;
   if (!Except && !Unwind)
     report_fatal_error("Don't know what kind of handler this is!");
   if (Unwind)
-    CurFrame->HandlesUnwind = true;
+    CurrentWinFrameInfo->HandlesUnwind = true;
   if (Except)
-    CurFrame->HandlesExceptions = true;
+    CurrentWinFrameInfo->HandlesExceptions = true;
 }
 
-void MCStreamer::EmitWin64EHHandlerData() {
-  EnsureValidW64UnwindInfo();
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  if (CurFrame->ChainedParent)
+void MCStreamer::EmitWinEHHandlerData() {
+  EnsureValidWinFrameInfo();
+  if (CurrentWinFrameInfo->ChainedParent)
     report_fatal_error("Chained unwind areas can't have handlers!");
 }
 
-void MCStreamer::EmitWin64EHPushReg(unsigned Register) {
-  EnsureValidW64UnwindInfo();
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  MCSymbol *Label = getContext().CreateTempSymbol();
-  MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
+void MCStreamer::EmitSyntaxDirective() {}
+
+void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
+  EnsureValidWinFrameInfo();
+
+  MCSymbol *Label = getContext().createTempSymbol();
   EmitLabel(Label);
-  CurFrame->Instructions.push_back(Inst);
+
+  WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
+  CurrentWinFrameInfo->Instructions.push_back(Inst);
 }
 
-void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
-  EnsureValidW64UnwindInfo();
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  if (CurFrame->LastFrameInst >= 0)
+void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
+  EnsureValidWinFrameInfo();
+  if (CurrentWinFrameInfo->LastFrameInst >= 0)
     report_fatal_error("Frame register and offset already specified!");
   if (Offset & 0x0F)
     report_fatal_error("Misaligned frame pointer offset!");
-  MCSymbol *Label = getContext().CreateTempSymbol();
-  MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Label, Register, Offset);
+  if (Offset > 240)
+    report_fatal_error("Frame offset must be less than or equal to 240!");
+
+  MCSymbol *Label = getContext().createTempSymbol();
   EmitLabel(Label);
-  CurFrame->LastFrameInst = CurFrame->Instructions.size();
-  CurFrame->Instructions.push_back(Inst);
+
+  WinEH::Instruction Inst =
+      Win64EH::Instruction::SetFPReg(Label, Register, Offset);
+  CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
+  CurrentWinFrameInfo->Instructions.push_back(Inst);
 }
 
-void MCStreamer::EmitWin64EHAllocStack(unsigned Size) {
-  EnsureValidW64UnwindInfo();
+void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
+  EnsureValidWinFrameInfo();
+  if (Size == 0)
+    report_fatal_error("Allocation size must be non-zero!");
   if (Size & 7)
     report_fatal_error("Misaligned stack allocation!");
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  MCSymbol *Label = getContext().CreateTempSymbol();
-  MCWin64EHInstruction Inst(Label, Size);
+
+  MCSymbol *Label = getContext().createTempSymbol();
   EmitLabel(Label);
-  CurFrame->Instructions.push_back(Inst);
+
+  WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
+  CurrentWinFrameInfo->Instructions.push_back(Inst);
 }
 
-void MCStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
-  EnsureValidW64UnwindInfo();
+void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
+  EnsureValidWinFrameInfo();
   if (Offset & 7)
     report_fatal_error("Misaligned saved register offset!");
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  MCSymbol *Label = getContext().CreateTempSymbol();
-  MCWin64EHInstruction Inst(
-     Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
-                            Label, Register, Offset);
+
+  MCSymbol *Label = getContext().createTempSymbol();
   EmitLabel(Label);
-  CurFrame->Instructions.push_back(Inst);
+
+  WinEH::Instruction Inst =
+      Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
+  CurrentWinFrameInfo->Instructions.push_back(Inst);
 }
 
-void MCStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
-  EnsureValidW64UnwindInfo();
+void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
+  EnsureValidWinFrameInfo();
   if (Offset & 0x0F)
     report_fatal_error("Misaligned saved vector register offset!");
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  MCSymbol *Label = getContext().CreateTempSymbol();
-  MCWin64EHInstruction Inst(
-    Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
-                            Label, Register, Offset);
+
+  MCSymbol *Label = getContext().createTempSymbol();
   EmitLabel(Label);
-  CurFrame->Instructions.push_back(Inst);
+
+  WinEH::Instruction Inst =
+      Win64EH::Instruction::SaveXMM(Label, Register, Offset);
+  CurrentWinFrameInfo->Instructions.push_back(Inst);
 }
 
-void MCStreamer::EmitWin64EHPushFrame(bool Code) {
-  EnsureValidW64UnwindInfo();
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  if (CurFrame->Instructions.size() > 0)
+void MCStreamer::EmitWinCFIPushFrame(bool Code) {
+  EnsureValidWinFrameInfo();
+  if (CurrentWinFrameInfo->Instructions.size() > 0)
     report_fatal_error("If present, PushMachFrame must be the first UOP");
-  MCSymbol *Label = getContext().CreateTempSymbol();
-  MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
+
+  MCSymbol *Label = getContext().createTempSymbol();
   EmitLabel(Label);
-  CurFrame->Instructions.push_back(Inst);
+
+  WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
+  CurrentWinFrameInfo->Instructions.push_back(Inst);
 }
 
-void MCStreamer::EmitWin64EHEndProlog() {
-  EnsureValidW64UnwindInfo();
-  MCWin64EHUnwindInfo *CurFrame = CurrentW64UnwindInfo;
-  CurFrame->PrologEnd = getContext().CreateTempSymbol();
-  EmitLabel(CurFrame->PrologEnd);
+void MCStreamer::EmitWinCFIEndProlog() {
+  EnsureValidWinFrameInfo();
+
+  MCSymbol *Label = getContext().createTempSymbol();
+  EmitLabel(Label);
+
+  CurrentWinFrameInfo->PrologEnd = Label;
+}
+
+void MCStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
 }
 
 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
-  llvm_unreachable("This file format doesn't support this directive");
 }
 
 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
-  llvm_unreachable("This file format doesn't support this directive");
 }
 
 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
@@ -604,26 +587,11 @@ void MCStreamer::EmitRawText(const Twine &T) {
   EmitRawTextImpl(T.toStringRef(Str));
 }
 
-void MCStreamer::EmitFrames(MCAsmBackend *MAB, bool usingCFI) {
-  if (!getNumFrameInfos())
-    return;
-
-  if (EmitEHFrame)
-    MCDwarfFrameEmitter::Emit(*this, MAB, usingCFI, true);
-
-  if (EmitDebugFrame)
-    MCDwarfFrameEmitter::Emit(*this, MAB, usingCFI, false);
-}
-
-void MCStreamer::EmitW64Tables() {
-  if (!getNumW64UnwindInfos())
-    return;
-
-  MCWin64EHUnwindEmitter::Emit(*this);
+void MCStreamer::EmitWindowsUnwindTables() {
 }
 
 void MCStreamer::Finish() {
-  if (!FrameInfos.empty() && !FrameInfos.back().End)
+  if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
     report_fatal_error("Unfinished frame!");
 
   MCTargetStreamer *TS = getTargetStreamer();
@@ -633,7 +601,132 @@ void MCStreamer::Finish() {
   FinishImpl();
 }
 
-MCSymbolData &MCStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
-  report_fatal_error("Not supported!");
-  return *(static_cast<MCSymbolData*>(0));
+void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+  visitUsedExpr(*Value);
+  Symbol->setVariableValue(Value);
+
+  MCTargetStreamer *TS = getTargetStreamer();
+  if (TS)
+    TS->emitAssignment(Symbol, Value);
+}
+
+void MCTargetStreamer::prettyPrintAsm(MCInstPrinter &InstPrinter, raw_ostream &OS,
+                              const MCInst &Inst, const MCSubtargetInfo &STI) {
+  InstPrinter.printInst(&Inst, OS, "", STI);
+}
+
+void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
+}
+
+void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
+  switch (Expr.getKind()) {
+  case MCExpr::Target:
+    cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
+    break;
+
+  case MCExpr::Constant:
+    break;
+
+  case MCExpr::Binary: {
+    const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
+    visitUsedExpr(*BE.getLHS());
+    visitUsedExpr(*BE.getRHS());
+    break;
+  }
+
+  case MCExpr::SymbolRef:
+    visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
+    break;
+
+  case MCExpr::Unary:
+    visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
+    break;
+  }
+}
+
+void MCStreamer::EmitInstruction(const MCInst &Inst,
+                                 const MCSubtargetInfo &STI) {
+  // Scan for values.
+  for (unsigned i = Inst.getNumOperands(); i--;)
+    if (Inst.getOperand(i).isExpr())
+      visitUsedExpr(*Inst.getOperand(i).getExpr());
+}
+
+void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
+                                        unsigned Size) {
+  // Get the Hi-Lo expression.
+  const MCExpr *Diff =
+      MCBinaryExpr::createSub(MCSymbolRefExpr::create(Hi, Context),
+                              MCSymbolRefExpr::create(Lo, Context), Context);
+
+  const MCAsmInfo *MAI = Context.getAsmInfo();
+  if (!MAI->doesSetDirectiveSuppressesReloc()) {
+    EmitValue(Diff, Size);
+    return;
+  }
+
+  // Otherwise, emit with .set (aka assignment).
+  MCSymbol *SetLabel = Context.createTempSymbol("set", true);
+  EmitAssignment(SetLabel, Diff);
+  EmitSymbolValue(SetLabel, Size);
+}
+
+void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
+void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
+void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
+void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
+void MCStreamer::EndCOFFSymbolDef() {}
+void MCStreamer::EmitFileDirective(StringRef Filename) {}
+void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
+void MCStreamer::EmitCOFFSymbolType(int Type) {}
+void MCStreamer::emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) {}
+void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                                       unsigned ByteAlignment) {}
+void MCStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
+                                uint64_t Size, unsigned ByteAlignment) {}
+void MCStreamer::ChangeSection(MCSection *, const MCExpr *) {}
+void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
+void MCStreamer::EmitBytes(StringRef Data) {}
+void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) {
+  visitUsedExpr(*Value);
+}
+void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
+void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
+void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
+                                      unsigned ValueSize,
+                                      unsigned MaxBytesToEmit) {}
+void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
+                                   unsigned MaxBytesToEmit) {}
+bool MCStreamer::EmitValueToOffset(const MCExpr *Offset, unsigned char Value) {
+  return false;
+}
+void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
+void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
+void MCStreamer::FinishImpl() {}
+void MCStreamer::EmitBundleUnlock() {}
+
+void MCStreamer::SwitchSection(MCSection *Section, const MCExpr *Subsection) {
+  assert(Section && "Cannot switch to a null section!");
+  MCSectionSubPair curSection = SectionStack.back().first;
+  SectionStack.back().second = curSection;
+  if (MCSectionSubPair(Section, Subsection) != curSection) {
+    ChangeSection(Section, Subsection);
+    SectionStack.back().first = MCSectionSubPair(Section, Subsection);
+    assert(!Section->hasEnded() && "Section already ended");
+    MCSymbol *Sym = Section->getBeginSymbol();
+    if (Sym && !Sym->isInSection())
+      EmitLabel(Sym);
+  }
+}
+
+MCSymbol *MCStreamer::endSection(MCSection *Section) {
+  // TODO: keep track of the last subsection so that this symbol appears in the
+  // correct place.
+  MCSymbol *Sym = Section->getEndSymbol(Context);
+  if (Sym->isInSection())
+    return Sym;
+
+  SwitchSection(Section);
+  EmitLabel(Sym);
+  return Sym;
 }