1 //===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCStreamer.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "llvm/ADT/Twine.h"
13 #include "llvm/MC/MCAsmBackend.h"
14 #include "llvm/MC/MCAsmInfo.h"
15 #include "llvm/MC/MCContext.h"
16 #include "llvm/MC/MCExpr.h"
17 #include "llvm/MC/MCObjectFileInfo.h"
18 #include "llvm/MC/MCObjectWriter.h"
19 #include "llvm/MC/MCSymbol.h"
20 #include "llvm/MC/MCWin64EH.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/LEB128.h"
23 #include "llvm/Support/raw_ostream.h"
27 // Pin the vtables to this file.
28 MCTargetStreamer::~MCTargetStreamer() {}
30 MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
31 S.setTargetStreamer(this);
34 void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
36 void MCTargetStreamer::finish() {}
38 void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
40 MCStreamer::MCStreamer(MCContext &Ctx)
41 : Context(Ctx), CurrentWinFrameInfo(nullptr) {
42 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
45 MCStreamer::~MCStreamer() {
46 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
47 delete WinFrameInfos[i];
50 void MCStreamer::reset() {
51 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
52 delete WinFrameInfos[i];
53 WinFrameInfos.clear();
54 CurrentWinFrameInfo = nullptr;
56 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
59 static const MCExpr *forceExpAbs(MCStreamer &OS, const MCExpr* Expr) {
60 MCContext &Context = OS.getContext();
61 assert(!isa<MCSymbolRefExpr>(Expr));
62 if (Context.getAsmInfo()->hasAggressiveSymbolFolding())
65 MCSymbol *ABS = Context.CreateTempSymbol();
66 OS.EmitAssignment(ABS, Expr);
67 return MCSymbolRefExpr::Create(ABS, Context);
70 raw_ostream &MCStreamer::GetCommentOS() {
71 // By default, discard comments.
75 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
77 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
78 for (auto &FI : DwarfFrameInfos)
79 FI.CompactUnwindEncoding =
80 (MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
83 /// EmitIntValue - Special case of EmitValue that avoids the client having to
84 /// pass in a MCExpr for constant integers.
85 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
86 assert(Size <= 8 && "Invalid size");
87 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
90 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
91 for (unsigned i = 0; i != Size; ++i) {
92 unsigned index = isLittleEndian ? i : (Size - i - 1);
93 buf[i] = uint8_t(Value >> (index * 8));
95 EmitBytes(StringRef(buf, Size));
98 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
99 /// client having to pass in a MCExpr for constant integers.
100 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
101 SmallString<128> Tmp;
102 raw_svector_ostream OSE(Tmp);
103 encodeULEB128(Value, OSE, Padding);
104 EmitBytes(OSE.str());
107 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
108 /// client having to pass in a MCExpr for constant integers.
109 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
110 SmallString<128> Tmp;
111 raw_svector_ostream OSE(Tmp);
112 encodeSLEB128(Value, OSE);
113 EmitBytes(OSE.str());
116 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
117 const MCExpr *ABS = forceExpAbs(*this, Value);
118 EmitValue(ABS, Size);
122 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
124 EmitValueImpl(Value, Size, Loc);
127 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
128 bool IsSectionRelative) {
129 assert((!IsSectionRelative || Size == 4) &&
130 "SectionRelative value requires 4-bytes");
132 if (!IsSectionRelative)
133 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
135 EmitCOFFSecRel32(Sym);
138 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
139 report_fatal_error("unsupported directive in streamer");
142 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
143 report_fatal_error("unsupported directive in streamer");
146 /// EmitFill - Emit NumBytes bytes worth of the value specified by
147 /// FillValue. This implements directives such as '.space'.
148 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
149 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
150 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
154 /// The implementation in this class just redirects to EmitFill.
155 void MCStreamer::EmitZeros(uint64_t NumBytes) {
156 EmitFill(NumBytes, 0);
159 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
161 StringRef Filename, unsigned CUID) {
162 return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID);
165 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
166 unsigned Column, unsigned Flags,
168 unsigned Discriminator,
169 StringRef FileName) {
170 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
174 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
175 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
176 if (!Table.getLabel()) {
177 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
179 Context.GetOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
181 return Table.getLabel();
184 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
185 if (DwarfFrameInfos.empty())
187 return &DwarfFrameInfos.back();
190 void MCStreamer::EnsureValidDwarfFrame() {
191 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
192 if (!CurFrame || CurFrame->End)
193 report_fatal_error("No open frame");
196 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
197 MCSymbol *EHSymbol) {
200 void MCStreamer::InitSections() {
201 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
204 void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
206 Symbol->setSection(*Section);
208 Symbol->setUndefined();
210 // As we emit symbols into a section, track the order so that they can
211 // be sorted upon later. Zero is reserved to mean 'unemitted'.
212 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
215 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
216 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
217 assert(getCurrentSection().first && "Cannot emit before setting section!");
218 AssignSection(Symbol, getCurrentSection().first);
220 MCTargetStreamer *TS = getTargetStreamer();
222 TS->emitLabel(Symbol);
225 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
229 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
230 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
231 if (CurFrame && !CurFrame->End)
232 report_fatal_error("Starting a frame before finishing the previous one!");
234 MCDwarfFrameInfo Frame;
235 Frame.IsSimple = IsSimple;
236 EmitCFIStartProcImpl(Frame);
238 DwarfFrameInfos.push_back(Frame);
241 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
244 void MCStreamer::EmitCFIEndProc() {
245 EnsureValidDwarfFrame();
246 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
247 EmitCFIEndProcImpl(*CurFrame);
250 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
251 // Put a dummy non-null value in Frame.End to mark that this frame has been
253 Frame.End = (MCSymbol *) 1;
256 MCSymbol *MCStreamer::EmitCFICommon() {
257 EnsureValidDwarfFrame();
258 MCSymbol *Label = getContext().CreateTempSymbol();
263 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
264 MCSymbol *Label = EmitCFICommon();
265 MCCFIInstruction Instruction =
266 MCCFIInstruction::createDefCfa(Label, Register, Offset);
267 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
268 CurFrame->Instructions.push_back(Instruction);
271 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
272 MCSymbol *Label = EmitCFICommon();
273 MCCFIInstruction Instruction =
274 MCCFIInstruction::createDefCfaOffset(Label, Offset);
275 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
276 CurFrame->Instructions.push_back(Instruction);
279 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
280 MCSymbol *Label = EmitCFICommon();
281 MCCFIInstruction Instruction =
282 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
283 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
284 CurFrame->Instructions.push_back(Instruction);
287 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
288 MCSymbol *Label = EmitCFICommon();
289 MCCFIInstruction Instruction =
290 MCCFIInstruction::createDefCfaRegister(Label, Register);
291 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
292 CurFrame->Instructions.push_back(Instruction);
295 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
296 MCSymbol *Label = EmitCFICommon();
297 MCCFIInstruction Instruction =
298 MCCFIInstruction::createOffset(Label, Register, Offset);
299 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
300 CurFrame->Instructions.push_back(Instruction);
303 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
304 MCSymbol *Label = EmitCFICommon();
305 MCCFIInstruction Instruction =
306 MCCFIInstruction::createRelOffset(Label, Register, Offset);
307 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
308 CurFrame->Instructions.push_back(Instruction);
311 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
313 EnsureValidDwarfFrame();
314 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
315 CurFrame->Personality = Sym;
316 CurFrame->PersonalityEncoding = Encoding;
319 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
320 EnsureValidDwarfFrame();
321 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
322 CurFrame->Lsda = Sym;
323 CurFrame->LsdaEncoding = Encoding;
326 void MCStreamer::EmitCFIRememberState() {
327 MCSymbol *Label = EmitCFICommon();
328 MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
329 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
330 CurFrame->Instructions.push_back(Instruction);
333 void MCStreamer::EmitCFIRestoreState() {
334 // FIXME: Error if there is no matching cfi_remember_state.
335 MCSymbol *Label = EmitCFICommon();
336 MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
337 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
338 CurFrame->Instructions.push_back(Instruction);
341 void MCStreamer::EmitCFISameValue(int64_t Register) {
342 MCSymbol *Label = EmitCFICommon();
343 MCCFIInstruction Instruction =
344 MCCFIInstruction::createSameValue(Label, Register);
345 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
346 CurFrame->Instructions.push_back(Instruction);
349 void MCStreamer::EmitCFIRestore(int64_t Register) {
350 MCSymbol *Label = EmitCFICommon();
351 MCCFIInstruction Instruction =
352 MCCFIInstruction::createRestore(Label, Register);
353 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
354 CurFrame->Instructions.push_back(Instruction);
357 void MCStreamer::EmitCFIEscape(StringRef Values) {
358 MCSymbol *Label = EmitCFICommon();
359 MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
360 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
361 CurFrame->Instructions.push_back(Instruction);
364 void MCStreamer::EmitCFISignalFrame() {
365 EnsureValidDwarfFrame();
366 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
367 CurFrame->IsSignalFrame = true;
370 void MCStreamer::EmitCFIUndefined(int64_t Register) {
371 MCSymbol *Label = EmitCFICommon();
372 MCCFIInstruction Instruction =
373 MCCFIInstruction::createUndefined(Label, Register);
374 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
375 CurFrame->Instructions.push_back(Instruction);
378 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
379 MCSymbol *Label = EmitCFICommon();
380 MCCFIInstruction Instruction =
381 MCCFIInstruction::createRegister(Label, Register1, Register2);
382 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
383 CurFrame->Instructions.push_back(Instruction);
386 void MCStreamer::EmitCFIWindowSave() {
387 MCSymbol *Label = EmitCFICommon();
388 MCCFIInstruction Instruction =
389 MCCFIInstruction::createWindowSave(Label);
390 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
391 CurFrame->Instructions.push_back(Instruction);
394 void MCStreamer::EnsureValidWinFrameInfo() {
395 if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
396 report_fatal_error("No open Win64 EH frame function!");
399 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
400 if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
401 report_fatal_error("Starting a function before ending the previous one!");
403 MCSymbol *StartProc = getContext().CreateTempSymbol();
404 EmitLabel(StartProc);
406 WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));
407 CurrentWinFrameInfo = WinFrameInfos.back();
410 void MCStreamer::EmitWinCFIEndProc() {
411 EnsureValidWinFrameInfo();
412 if (CurrentWinFrameInfo->ChainedParent)
413 report_fatal_error("Not all chained regions terminated!");
415 MCSymbol *Label = getContext().CreateTempSymbol();
417 CurrentWinFrameInfo->End = Label;
420 void MCStreamer::EmitWinCFIStartChained() {
421 EnsureValidWinFrameInfo();
423 MCSymbol *StartProc = getContext().CreateTempSymbol();
424 EmitLabel(StartProc);
426 WinFrameInfos.push_back(new WinEH::FrameInfo(CurrentWinFrameInfo->Function,
427 StartProc, CurrentWinFrameInfo));
428 CurrentWinFrameInfo = WinFrameInfos.back();
431 void MCStreamer::EmitWinCFIEndChained() {
432 EnsureValidWinFrameInfo();
433 if (!CurrentWinFrameInfo->ChainedParent)
434 report_fatal_error("End of a chained region outside a chained region!");
436 MCSymbol *Label = getContext().CreateTempSymbol();
439 CurrentWinFrameInfo->End = Label;
440 CurrentWinFrameInfo =
441 const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->ChainedParent);
444 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
446 EnsureValidWinFrameInfo();
447 if (CurrentWinFrameInfo->ChainedParent)
448 report_fatal_error("Chained unwind areas can't have handlers!");
449 CurrentWinFrameInfo->ExceptionHandler = Sym;
450 if (!Except && !Unwind)
451 report_fatal_error("Don't know what kind of handler this is!");
453 CurrentWinFrameInfo->HandlesUnwind = true;
455 CurrentWinFrameInfo->HandlesExceptions = true;
458 void MCStreamer::EmitWinEHHandlerData() {
459 EnsureValidWinFrameInfo();
460 if (CurrentWinFrameInfo->ChainedParent)
461 report_fatal_error("Chained unwind areas can't have handlers!");
464 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
465 EnsureValidWinFrameInfo();
467 MCSymbol *Label = getContext().CreateTempSymbol();
470 WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
471 CurrentWinFrameInfo->Instructions.push_back(Inst);
474 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
475 EnsureValidWinFrameInfo();
476 if (CurrentWinFrameInfo->LastFrameInst >= 0)
477 report_fatal_error("Frame register and offset already specified!");
479 report_fatal_error("Misaligned frame pointer offset!");
481 report_fatal_error("Frame offset must be less than or equal to 240!");
483 MCSymbol *Label = getContext().CreateTempSymbol();
486 WinEH::Instruction Inst =
487 Win64EH::Instruction::SetFPReg(Label, Register, Offset);
488 CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
489 CurrentWinFrameInfo->Instructions.push_back(Inst);
492 void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
493 EnsureValidWinFrameInfo();
495 report_fatal_error("Allocation size must be non-zero!");
497 report_fatal_error("Misaligned stack allocation!");
499 MCSymbol *Label = getContext().CreateTempSymbol();
502 WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
503 CurrentWinFrameInfo->Instructions.push_back(Inst);
506 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
507 EnsureValidWinFrameInfo();
509 report_fatal_error("Misaligned saved register offset!");
511 MCSymbol *Label = getContext().CreateTempSymbol();
514 WinEH::Instruction Inst =
515 Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
516 CurrentWinFrameInfo->Instructions.push_back(Inst);
519 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
520 EnsureValidWinFrameInfo();
522 report_fatal_error("Misaligned saved vector register offset!");
524 MCSymbol *Label = getContext().CreateTempSymbol();
527 WinEH::Instruction Inst =
528 Win64EH::Instruction::SaveXMM(Label, Register, Offset);
529 CurrentWinFrameInfo->Instructions.push_back(Inst);
532 void MCStreamer::EmitWinCFIPushFrame(bool Code) {
533 EnsureValidWinFrameInfo();
534 if (CurrentWinFrameInfo->Instructions.size() > 0)
535 report_fatal_error("If present, PushMachFrame must be the first UOP");
537 MCSymbol *Label = getContext().CreateTempSymbol();
540 WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
541 CurrentWinFrameInfo->Instructions.push_back(Inst);
544 void MCStreamer::EmitWinCFIEndProlog() {
545 EnsureValidWinFrameInfo();
547 MCSymbol *Label = getContext().CreateTempSymbol();
550 CurrentWinFrameInfo->PrologEnd = Label;
553 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
556 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
559 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
560 /// the specified string in the output .s file. This capability is
561 /// indicated by the hasRawTextSupport() predicate.
562 void MCStreamer::EmitRawTextImpl(StringRef String) {
563 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
564 " something must not be fully mc'ized\n";
568 void MCStreamer::EmitRawText(const Twine &T) {
569 SmallString<128> Str;
570 EmitRawTextImpl(T.toStringRef(Str));
573 void MCStreamer::EmitWindowsUnwindTables() {
576 void MCStreamer::Finish() {
577 if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
578 report_fatal_error("Unfinished frame!");
580 MCTargetStreamer *TS = getTargetStreamer();
587 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
588 visitUsedExpr(*Value);
589 Symbol->setVariableValue(Value);
591 MCTargetStreamer *TS = getTargetStreamer();
593 TS->emitAssignment(Symbol, Value);
596 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
599 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
600 switch (Expr.getKind()) {
602 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
605 case MCExpr::Constant:
608 case MCExpr::Binary: {
609 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
610 visitUsedExpr(*BE.getLHS());
611 visitUsedExpr(*BE.getRHS());
615 case MCExpr::SymbolRef:
616 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
620 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
625 void MCStreamer::EmitInstruction(const MCInst &Inst,
626 const MCSubtargetInfo &STI) {
628 for (unsigned i = Inst.getNumOperands(); i--;)
629 if (Inst.getOperand(i).isExpr())
630 visitUsedExpr(*Inst.getOperand(i).getExpr());
633 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
634 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
635 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
636 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
637 void MCStreamer::EndCOFFSymbolDef() {}
638 void MCStreamer::EmitFileDirective(StringRef Filename) {}
639 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
640 void MCStreamer::EmitCOFFSymbolType(int Type) {}
641 void MCStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
642 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
643 unsigned ByteAlignment) {}
644 void MCStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
645 uint64_t Size, unsigned ByteAlignment) {}
646 void MCStreamer::ChangeSection(const MCSection *, const MCExpr *) {}
647 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
648 void MCStreamer::EmitBytes(StringRef Data) {}
649 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
651 visitUsedExpr(*Value);
653 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
654 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
655 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
657 unsigned MaxBytesToEmit) {}
658 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
659 unsigned MaxBytesToEmit) {}
660 bool MCStreamer::EmitValueToOffset(const MCExpr *Offset, unsigned char Value) {
663 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
664 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
665 void MCStreamer::FinishImpl() {}
666 void MCStreamer::EmitBundleUnlock() {}