//===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

#include "llvm/MC/MCStreamer.h"

#include "llvm/ADT/SmallString.h"

#include "llvm/ADT/Twine.h"

#include "llvm/MC/MCAsmBackend.h"

#include "llvm/MC/MCAsmInfo.h"

#include "llvm/MC/MCContext.h"

#include "llvm/MC/MCExpr.h"

#include "llvm/MC/MCInst.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"

#include <cstdlib>

//#include <iostream>

using namespace llvm_ks;

// Pin the vtables to this file.

MCTargetStreamer::~MCTargetStreamer() {}

MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {

  S.setTargetStreamer(this);

}

void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}

void MCTargetStreamer::finish() {}

void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}

MCStreamer::MCStreamer(MCContext &Ctx)

    : Context(Ctx), CurrentWinFrameInfo(nullptr) {

  SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());

}

MCStreamer::~MCStreamer() {

  for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)

    delete WinFrameInfos[i];

}

void MCStreamer::reset() {

  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>());

}

raw_ostream &MCStreamer::GetCommentOS() {

  // By default, discard comments.

  return nulls();

}

void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}

void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {

  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, bool &Error)

{

  Error = false;

  //assert(1 <= Size && Size <= 8 && "Invalid size");

  if (1 > Size || Size > 8) {

      Error = true;

      return;

  }

  //assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&

  //       "Invalid size");

  if (!isUIntN(8 * Size, Value) && !isIntN(8 * Size, Value)) {

      Error = true;

      return;

  }

  char buf[8];

  const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();

  for (unsigned i = 0; i != Size; ++i) {

    unsigned index = isLittleEndian ? i : (Size - i - 1);

    buf[i] = uint8_t(Value >> (index * 8));

  }

  EmitBytes(StringRef(buf, Size));

}

/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the

/// client having to pass in a MCExpr for constant integers.

void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {

  SmallString<128> Tmp;

  raw_svector_ostream OSE(Tmp);

  encodeULEB128(Value, OSE, Padding);

  EmitBytes(OSE.str());

}

/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the

/// client having to pass in a MCExpr for constant integers.

void MCStreamer::EmitSLEB128IntValue(int64_t Value) {

  SmallString<128> Tmp;

  raw_svector_ostream OSE(Tmp);

  encodeSLEB128(Value, OSE);

  EmitBytes(OSE.str());

}

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");

  if (!IsSectionRelative)

    EmitValueImpl(MCSymbolRefExpr::create(Sym, getContext()), Size);

  else

    EmitCOFFSecRel32(Sym);

}

void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {

  report_fatal_error("unsupported directive in streamer");

}

void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {

  report_fatal_error("unsupported directive in streamer");

}

/// 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());

  for (uint64_t i = 0, e = NumBytes; i != e; ++i)

    EmitValue(E, 1);

}

/// The implementation in this class just redirects to EmitFill.

void MCStreamer::EmitZeros(uint64_t NumBytes) {

  EmitFill(NumBytes, 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,

                                       unsigned Column, unsigned Flags,

                                       unsigned Isa,

                                       unsigned Discriminator,

                                       StringRef FileName) {

  getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,

                                  Discriminator);

}

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();

}

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");

}

unsigned MCStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename) {

  return getContext().getCVFile(Filename, FileNo);

}

void MCStreamer::EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,

                                    unsigned Line, unsigned Column,

                                    bool PrologueEnd, bool IsStmt,

                                    StringRef FileName) {

  getContext().setCurrentCVLoc(FunctionId, FileNo, Line, Column, PrologueEnd,

                               IsStmt);

}

void MCStreamer::EmitCVLinetableDirective(unsigned FunctionId,

                                          const MCSymbol *Begin,

                                          const MCSymbol *End) {}

void MCStreamer::EmitCVInlineLinetableDirective(

    unsigned PrimaryFunctionId, unsigned SourceFileId, unsigned SourceLineNum,

    ArrayRef<unsigned> SecondaryFunctionIds) {}

void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,

                                     MCSymbol *EHSymbol) {

}

void MCStreamer::InitSections(bool NoExecStack) {

    SwitchSection(getContext().getObjectFileInfo()->getTextSection());

}

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'.

  SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();

}

void MCStreamer::EmitLabel(MCSymbol *Symbol) {

  assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");

  assert(getCurrentSection().first && "Cannot emit before setting section!");

  assert(!Symbol->getFragment() && "Unexpected fragment on symbol data!");

  Symbol->setFragment(&getCurrentSectionOnly()->getDummyFragment());

  MCTargetStreamer *TS = getTargetStreamer();

  if (TS)

    TS->emitLabel(Symbol);

}

void MCStreamer::EmitCFISections(bool EH, bool Debug) {

  assert(EH || Debug);

}

void MCStreamer::EmitCFIStartProc(bool IsSimple) {

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  if (CurFrame && !CurFrame->End)

    report_fatal_error("Starting a frame before finishing the previous one!");

  MCDwarfFrameInfo Frame;

  Frame.IsSimple = IsSimple;

  EmitCFIStartProcImpl(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();

      }

    }

  }

  DwarfFrameInfos.push_back(Frame);

}

void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {

}

void MCStreamer::EmitCFIEndProc() {

  EnsureValidDwarfFrame();

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  EmitCFIEndProcImpl(*CurFrame);

}

void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {

  // Put a dummy non-null value in Frame.End to mark that this frame has been

  // closed.

  Frame.End = (MCSymbol *) 1;

}

MCSymbol *MCStreamer::EmitCFICommon() {

  EnsureValidDwarfFrame();

  MCSymbol *Label = getContext().createTempSymbol();

  EmitLabel(Label);

  return Label;

}

void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction =

    MCCFIInstruction::createDefCfa(Label, Register, Offset);

  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 = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction =

    MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction =

    MCCFIInstruction::createDefCfaRegister(Label, Register);

  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 = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction =

    MCCFIInstruction::createRelOffset(Label, Register, Offset);

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,

                                    unsigned Encoding) {

  EnsureValidDwarfFrame();

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Personality = Sym;

  CurFrame->PersonalityEncoding = Encoding;

}

void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {

  EnsureValidDwarfFrame();

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Lsda = Sym;

  CurFrame->LsdaEncoding = Encoding;

}

void MCStreamer::EmitCFIRememberState() {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFIRestoreState() {

  // FIXME: Error if there is no matching cfi_remember_state.

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFISameValue(int64_t Register) {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction =

    MCCFIInstruction::createSameValue(Label, Register);

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFIRestore(int64_t Register) {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction =

    MCCFIInstruction::createRestore(Label, Register);

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFIEscape(StringRef Values) {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);

  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() {

  EnsureValidDwarfFrame();

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->IsSignalFrame = true;

}

void MCStreamer::EmitCFIUndefined(int64_t Register) {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction =

    MCCFIInstruction::createUndefined(Label, Register);

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction =

    MCCFIInstruction::createRegister(Label, Register1, Register2);

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

void MCStreamer::EmitCFIWindowSave() {

  MCSymbol *Label = EmitCFICommon();

  MCCFIInstruction Instruction =

    MCCFIInstruction::createWindowSave(Label);

  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();

  CurFrame->Instructions.push_back(Instruction);

}

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::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!");

  MCSymbol *StartProc = getContext().createTempSymbol();

  EmitLabel(StartProc);

  WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));

  CurrentWinFrameInfo = WinFrameInfos.back();

}

void MCStreamer::EmitWinCFIEndProc() {

  EnsureValidWinFrameInfo();

  if (CurrentWinFrameInfo->ChainedParent)

    report_fatal_error("Not all chained regions terminated!");

  MCSymbol *Label = getContext().createTempSymbol();

  EmitLabel(Label);

  CurrentWinFrameInfo->End = Label;

}

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::EmitWinCFIEndChained() {

  EnsureValidWinFrameInfo();

  if (!CurrentWinFrameInfo->ChainedParent)

    report_fatal_error("End of a chained region outside a chained region!");

  MCSymbol *Label = getContext().createTempSymbol();

  EmitLabel(Label);

  CurrentWinFrameInfo->End = Label;

  CurrentWinFrameInfo =

      const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->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!");

  CurrentWinFrameInfo->ExceptionHandler = Sym;

  if (!Except && !Unwind)

    report_fatal_error("Don't know what kind of handler this is!");

  if (Unwind)

    CurrentWinFrameInfo->HandlesUnwind = true;

  if (Except)

    CurrentWinFrameInfo->HandlesExceptions = true;

}

void MCStreamer::EmitWinEHHandlerData() {

  EnsureValidWinFrameInfo();

  if (CurrentWinFrameInfo->ChainedParent)

    report_fatal_error("Chained unwind areas can't have handlers!");

}

void MCStreamer::EmitSyntaxDirective() {}

void MCStreamer::EmitWinCFIPushReg(unsigned Register) {

  EnsureValidWinFrameInfo();

  MCSymbol *Label = getContext().createTempSymbol();

  EmitLabel(Label);

  WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);

  CurrentWinFrameInfo->Instructions.push_back(Inst);

}

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!");

  if (Offset > 240)

    report_fatal_error("Frame offset must be less than or equal to 240!");

  MCSymbol *Label = getContext().createTempSymbol();

  EmitLabel(Label);

  WinEH::Instruction Inst =

      Win64EH::Instruction::SetFPReg(Label, Register, Offset);

  CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();

  CurrentWinFrameInfo->Instructions.push_back(Inst);

}

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!");

  MCSymbol *Label = getContext().createTempSymbol();

  EmitLabel(Label);

  WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);

  CurrentWinFrameInfo->Instructions.push_back(Inst);

}

void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {

  EnsureValidWinFrameInfo();

  if (Offset & 7)

    report_fatal_error("Misaligned saved register offset!");

  MCSymbol *Label = getContext().createTempSymbol();

  EmitLabel(Label);

  WinEH::Instruction Inst =

      Win64EH::Instruction::SaveNonVol(Label, Register, Offset);

  CurrentWinFrameInfo->Instructions.push_back(Inst);

}

void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {

  EnsureValidWinFrameInfo();

  if (Offset & 0x0F)

    report_fatal_error("Misaligned saved vector register offset!");

  MCSymbol *Label = getContext().createTempSymbol();

  EmitLabel(Label);

  WinEH::Instruction Inst =

      Win64EH::Instruction::SaveXMM(Label, Register, Offset);

  CurrentWinFrameInfo->Instructions.push_back(Inst);

}

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();

  EmitLabel(Label);

  WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);

  CurrentWinFrameInfo->Instructions.push_back(Inst);

}

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) {

}

void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {

}

/// EmitRawText - If this file is backed by an assembly streamer, this dumps

/// the specified string in the output .s file.  This capability is

/// indicated by the hasRawTextSupport() predicate.

void MCStreamer::EmitRawTextImpl(StringRef String) {

  errs() << "EmitRawText called on an MCStreamer that doesn't support it, "

  " something must not be fully mc'ized\n";

  abort();

}

void MCStreamer::EmitRawText(const Twine &T) {

  SmallString<128> Str;

  EmitRawTextImpl(T.toStringRef(Str));

}

void MCStreamer::EmitWindowsUnwindTables() {

}

unsigned int MCStreamer::Finish() {

  if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)

    report_fatal_error("Unfinished frame!");

  MCTargetStreamer *TS = getTargetStreamer();

  if (TS)

    TS->finish();

  return FinishImpl();

}

bool MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {

  visitUsedExpr(*Value);

  bool valid;

  Symbol->setVariableValue(Value, valid);

  if (!valid)

      return false;

  MCTargetStreamer *TS = getTargetStreamer();

  if (TS)

    TS->emitAssignment(Symbol, Value);

  return true;

}

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(MCInst &Inst,

                                 const MCSubtargetInfo &STI,

                                 unsigned int &KsError) {

  // 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) {}

void MCStreamer::emitValueToOffset(const MCExpr *Offset, unsigned char Value) {}

void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}

void MCStreamer::EmitBundleLock(bool AlignToEnd) {}

unsigned int MCStreamer::FinishImpl() { return 0; }

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;

}