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 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
84 const MCSymbol *Label, int PointerSize) {
85 // emit the sequence to set the address
86 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
87 EmitULEB128IntValue(PointerSize + 1);
88 EmitIntValue(dwarf::DW_LNE_set_address, 1);
89 EmitSymbolValue(Label, PointerSize);
91 // emit the sequence for the LineDelta (from 1) and a zero address delta.
92 MCDwarfLineAddr::Emit(this, LineDelta, 0);
95 /// EmitIntValue - Special case of EmitValue that avoids the client having to
96 /// pass in a MCExpr for constant integers.
97 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
98 assert(Size <= 8 && "Invalid size");
99 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
102 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
103 for (unsigned i = 0; i != Size; ++i) {
104 unsigned index = isLittleEndian ? i : (Size - i - 1);
105 buf[i] = uint8_t(Value >> (index * 8));
107 EmitBytes(StringRef(buf, Size));
110 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
111 /// client having to pass in a MCExpr for constant integers.
112 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
113 SmallString<128> Tmp;
114 raw_svector_ostream OSE(Tmp);
115 encodeULEB128(Value, OSE, Padding);
116 EmitBytes(OSE.str());
119 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
120 /// client having to pass in a MCExpr for constant integers.
121 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
122 SmallString<128> Tmp;
123 raw_svector_ostream OSE(Tmp);
124 encodeSLEB128(Value, OSE);
125 EmitBytes(OSE.str());
128 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
129 const MCExpr *ABS = forceExpAbs(*this, Value);
130 EmitValue(ABS, Size);
134 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
136 EmitValueImpl(Value, Size, Loc);
139 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
140 bool IsSectionRelative) {
141 assert((!IsSectionRelative || Size == 4) &&
142 "SectionRelative value requires 4-bytes");
144 if (!IsSectionRelative)
145 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
147 EmitCOFFSecRel32(Sym);
150 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
151 report_fatal_error("unsupported directive in streamer");
154 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
155 report_fatal_error("unsupported directive in streamer");
158 /// EmitFill - Emit NumBytes bytes worth of the value specified by
159 /// FillValue. This implements directives such as '.space'.
160 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
161 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
162 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
166 /// The implementation in this class just redirects to EmitFill.
167 void MCStreamer::EmitZeros(uint64_t NumBytes) {
168 EmitFill(NumBytes, 0);
171 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
173 StringRef Filename, unsigned CUID) {
174 return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID);
177 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
178 unsigned Column, unsigned Flags,
180 unsigned Discriminator,
181 StringRef FileName) {
182 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
186 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
187 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
188 if (!Table.getLabel()) {
189 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
191 Context.GetOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
193 return Table.getLabel();
196 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
197 if (DwarfFrameInfos.empty())
199 return &DwarfFrameInfos.back();
202 void MCStreamer::EnsureValidDwarfFrame() {
203 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
204 if (!CurFrame || CurFrame->End)
205 report_fatal_error("No open frame");
208 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
209 MCSymbol *EHSymbol) {
212 void MCStreamer::InitSections() {
213 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
216 void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
218 Symbol->setSection(*Section);
220 Symbol->setUndefined();
222 // As we emit symbols into a section, track the order so that they can
223 // be sorted upon later. Zero is reserved to mean 'unemitted'.
224 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
227 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
228 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
229 assert(getCurrentSection().first && "Cannot emit before setting section!");
230 AssignSection(Symbol, getCurrentSection().first);
232 MCTargetStreamer *TS = getTargetStreamer();
234 TS->emitLabel(Symbol);
237 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
238 EnsureValidDwarfFrame();
239 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
240 CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
243 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
247 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
248 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
249 if (CurFrame && !CurFrame->End)
250 report_fatal_error("Starting a frame before finishing the previous one!");
252 MCDwarfFrameInfo Frame;
253 Frame.IsSimple = IsSimple;
254 EmitCFIStartProcImpl(Frame);
256 DwarfFrameInfos.push_back(Frame);
259 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
262 void MCStreamer::EmitCFIEndProc() {
263 EnsureValidDwarfFrame();
264 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
265 EmitCFIEndProcImpl(*CurFrame);
268 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
269 // Put a dummy non-null value in Frame.End to mark that this frame has been
271 Frame.End = (MCSymbol *) 1;
274 MCSymbol *MCStreamer::EmitCFICommon() {
275 EnsureValidDwarfFrame();
276 MCSymbol *Label = getContext().CreateTempSymbol();
281 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
282 MCSymbol *Label = EmitCFICommon();
283 MCCFIInstruction Instruction =
284 MCCFIInstruction::createDefCfa(Label, Register, Offset);
285 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
286 CurFrame->Instructions.push_back(Instruction);
289 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
290 MCSymbol *Label = EmitCFICommon();
291 MCCFIInstruction Instruction =
292 MCCFIInstruction::createDefCfaOffset(Label, Offset);
293 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
294 CurFrame->Instructions.push_back(Instruction);
297 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
298 MCSymbol *Label = EmitCFICommon();
299 MCCFIInstruction Instruction =
300 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
301 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
302 CurFrame->Instructions.push_back(Instruction);
305 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
306 MCSymbol *Label = EmitCFICommon();
307 MCCFIInstruction Instruction =
308 MCCFIInstruction::createDefCfaRegister(Label, Register);
309 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
310 CurFrame->Instructions.push_back(Instruction);
313 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
314 MCSymbol *Label = EmitCFICommon();
315 MCCFIInstruction Instruction =
316 MCCFIInstruction::createOffset(Label, Register, Offset);
317 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
318 CurFrame->Instructions.push_back(Instruction);
321 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
322 MCSymbol *Label = EmitCFICommon();
323 MCCFIInstruction Instruction =
324 MCCFIInstruction::createRelOffset(Label, Register, Offset);
325 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
326 CurFrame->Instructions.push_back(Instruction);
329 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
331 EnsureValidDwarfFrame();
332 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
333 CurFrame->Personality = Sym;
334 CurFrame->PersonalityEncoding = Encoding;
337 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
338 EnsureValidDwarfFrame();
339 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
340 CurFrame->Lsda = Sym;
341 CurFrame->LsdaEncoding = Encoding;
344 void MCStreamer::EmitCFIRememberState() {
345 MCSymbol *Label = EmitCFICommon();
346 MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
347 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
348 CurFrame->Instructions.push_back(Instruction);
351 void MCStreamer::EmitCFIRestoreState() {
352 // FIXME: Error if there is no matching cfi_remember_state.
353 MCSymbol *Label = EmitCFICommon();
354 MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
355 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
356 CurFrame->Instructions.push_back(Instruction);
359 void MCStreamer::EmitCFISameValue(int64_t Register) {
360 MCSymbol *Label = EmitCFICommon();
361 MCCFIInstruction Instruction =
362 MCCFIInstruction::createSameValue(Label, Register);
363 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
364 CurFrame->Instructions.push_back(Instruction);
367 void MCStreamer::EmitCFIRestore(int64_t Register) {
368 MCSymbol *Label = EmitCFICommon();
369 MCCFIInstruction Instruction =
370 MCCFIInstruction::createRestore(Label, Register);
371 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
372 CurFrame->Instructions.push_back(Instruction);
375 void MCStreamer::EmitCFIEscape(StringRef Values) {
376 MCSymbol *Label = EmitCFICommon();
377 MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
378 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
379 CurFrame->Instructions.push_back(Instruction);
382 void MCStreamer::EmitCFISignalFrame() {
383 EnsureValidDwarfFrame();
384 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
385 CurFrame->IsSignalFrame = true;
388 void MCStreamer::EmitCFIUndefined(int64_t Register) {
389 MCSymbol *Label = EmitCFICommon();
390 MCCFIInstruction Instruction =
391 MCCFIInstruction::createUndefined(Label, Register);
392 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
393 CurFrame->Instructions.push_back(Instruction);
396 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
397 MCSymbol *Label = EmitCFICommon();
398 MCCFIInstruction Instruction =
399 MCCFIInstruction::createRegister(Label, Register1, Register2);
400 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
401 CurFrame->Instructions.push_back(Instruction);
404 void MCStreamer::EmitCFIWindowSave() {
405 MCSymbol *Label = EmitCFICommon();
406 MCCFIInstruction Instruction =
407 MCCFIInstruction::createWindowSave(Label);
408 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
409 CurFrame->Instructions.push_back(Instruction);
412 void MCStreamer::EnsureValidWinFrameInfo() {
413 if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
414 report_fatal_error("No open Win64 EH frame function!");
417 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
418 if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
419 report_fatal_error("Starting a function before ending the previous one!");
421 MCSymbol *StartProc = getContext().CreateTempSymbol();
422 EmitLabel(StartProc);
424 WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));
425 CurrentWinFrameInfo = WinFrameInfos.back();
428 void MCStreamer::EmitWinCFIEndProc() {
429 EnsureValidWinFrameInfo();
430 if (CurrentWinFrameInfo->ChainedParent)
431 report_fatal_error("Not all chained regions terminated!");
433 MCSymbol *Label = getContext().CreateTempSymbol();
435 CurrentWinFrameInfo->End = Label;
438 void MCStreamer::EmitWinCFIStartChained() {
439 EnsureValidWinFrameInfo();
441 MCSymbol *StartProc = getContext().CreateTempSymbol();
442 EmitLabel(StartProc);
444 WinFrameInfos.push_back(new WinEH::FrameInfo(CurrentWinFrameInfo->Function,
445 StartProc, CurrentWinFrameInfo));
446 CurrentWinFrameInfo = WinFrameInfos.back();
449 void MCStreamer::EmitWinCFIEndChained() {
450 EnsureValidWinFrameInfo();
451 if (!CurrentWinFrameInfo->ChainedParent)
452 report_fatal_error("End of a chained region outside a chained region!");
454 MCSymbol *Label = getContext().CreateTempSymbol();
457 CurrentWinFrameInfo->End = Label;
458 CurrentWinFrameInfo =
459 const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->ChainedParent);
462 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
464 EnsureValidWinFrameInfo();
465 if (CurrentWinFrameInfo->ChainedParent)
466 report_fatal_error("Chained unwind areas can't have handlers!");
467 CurrentWinFrameInfo->ExceptionHandler = Sym;
468 if (!Except && !Unwind)
469 report_fatal_error("Don't know what kind of handler this is!");
471 CurrentWinFrameInfo->HandlesUnwind = true;
473 CurrentWinFrameInfo->HandlesExceptions = true;
476 void MCStreamer::EmitWinEHHandlerData() {
477 EnsureValidWinFrameInfo();
478 if (CurrentWinFrameInfo->ChainedParent)
479 report_fatal_error("Chained unwind areas can't have handlers!");
482 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
483 EnsureValidWinFrameInfo();
485 MCSymbol *Label = getContext().CreateTempSymbol();
488 WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
489 CurrentWinFrameInfo->Instructions.push_back(Inst);
492 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
493 EnsureValidWinFrameInfo();
494 if (CurrentWinFrameInfo->LastFrameInst >= 0)
495 report_fatal_error("Frame register and offset already specified!");
497 report_fatal_error("Misaligned frame pointer offset!");
499 report_fatal_error("Frame offset must be less than or equal to 240!");
501 MCSymbol *Label = getContext().CreateTempSymbol();
504 WinEH::Instruction Inst =
505 Win64EH::Instruction::SetFPReg(Label, Register, Offset);
506 CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
507 CurrentWinFrameInfo->Instructions.push_back(Inst);
510 void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
511 EnsureValidWinFrameInfo();
513 report_fatal_error("Allocation size must be non-zero!");
515 report_fatal_error("Misaligned stack allocation!");
517 MCSymbol *Label = getContext().CreateTempSymbol();
520 WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
521 CurrentWinFrameInfo->Instructions.push_back(Inst);
524 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
525 EnsureValidWinFrameInfo();
527 report_fatal_error("Misaligned saved register offset!");
529 MCSymbol *Label = getContext().CreateTempSymbol();
532 WinEH::Instruction Inst =
533 Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
534 CurrentWinFrameInfo->Instructions.push_back(Inst);
537 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
538 EnsureValidWinFrameInfo();
540 report_fatal_error("Misaligned saved vector register offset!");
542 MCSymbol *Label = getContext().CreateTempSymbol();
545 WinEH::Instruction Inst =
546 Win64EH::Instruction::SaveXMM(Label, Register, Offset);
547 CurrentWinFrameInfo->Instructions.push_back(Inst);
550 void MCStreamer::EmitWinCFIPushFrame(bool Code) {
551 EnsureValidWinFrameInfo();
552 if (CurrentWinFrameInfo->Instructions.size() > 0)
553 report_fatal_error("If present, PushMachFrame must be the first UOP");
555 MCSymbol *Label = getContext().CreateTempSymbol();
558 WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
559 CurrentWinFrameInfo->Instructions.push_back(Inst);
562 void MCStreamer::EmitWinCFIEndProlog() {
563 EnsureValidWinFrameInfo();
565 MCSymbol *Label = getContext().CreateTempSymbol();
568 CurrentWinFrameInfo->PrologEnd = Label;
571 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
574 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
577 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
578 /// the specified string in the output .s file. This capability is
579 /// indicated by the hasRawTextSupport() predicate.
580 void MCStreamer::EmitRawTextImpl(StringRef String) {
581 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
582 " something must not be fully mc'ized\n";
586 void MCStreamer::EmitRawText(const Twine &T) {
587 SmallString<128> Str;
588 EmitRawTextImpl(T.toStringRef(Str));
591 void MCStreamer::EmitWindowsUnwindTables() {
594 void MCStreamer::Finish() {
595 if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
596 report_fatal_error("Unfinished frame!");
598 MCTargetStreamer *TS = getTargetStreamer();
605 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
606 visitUsedExpr(*Value);
607 Symbol->setVariableValue(Value);
609 MCTargetStreamer *TS = getTargetStreamer();
611 TS->emitAssignment(Symbol, Value);
614 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
617 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
618 switch (Expr.getKind()) {
620 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
623 case MCExpr::Constant:
626 case MCExpr::Binary: {
627 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
628 visitUsedExpr(*BE.getLHS());
629 visitUsedExpr(*BE.getRHS());
633 case MCExpr::SymbolRef:
634 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
638 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
643 void MCStreamer::EmitInstruction(const MCInst &Inst,
644 const MCSubtargetInfo &STI) {
646 for (unsigned i = Inst.getNumOperands(); i--;)
647 if (Inst.getOperand(i).isExpr())
648 visitUsedExpr(*Inst.getOperand(i).getExpr());
651 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
652 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
653 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
654 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
655 void MCStreamer::EndCOFFSymbolDef() {}
656 void MCStreamer::EmitFileDirective(StringRef Filename) {}
657 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
658 void MCStreamer::EmitCOFFSymbolType(int Type) {}
659 void MCStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
660 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
661 unsigned ByteAlignment) {}
662 void MCStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
663 uint64_t Size, unsigned ByteAlignment) {}
664 void MCStreamer::ChangeSection(const MCSection *, const MCExpr *) {}
665 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
666 void MCStreamer::EmitBytes(StringRef Data) {}
667 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
669 visitUsedExpr(*Value);
671 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
672 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
673 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
675 unsigned MaxBytesToEmit) {}
676 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
677 unsigned MaxBytesToEmit) {}
678 bool MCStreamer::EmitValueToOffset(const MCExpr *Offset, unsigned char Value) {
681 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
682 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
683 void MCStreamer::FinishImpl() {}
684 void MCStreamer::EmitBundleUnlock() {}