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 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
62 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
64 MCSymbolRefExpr::Create(A, Variant, Context);
66 MCSymbolRefExpr::Create(B, Variant, Context);
67 const MCExpr *AddrDelta =
68 MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
72 static const MCExpr *forceExpAbs(MCStreamer &OS, const MCExpr* Expr) {
73 MCContext &Context = OS.getContext();
74 assert(!isa<MCSymbolRefExpr>(Expr));
75 if (Context.getAsmInfo()->hasAggressiveSymbolFolding())
78 MCSymbol *ABS = Context.CreateTempSymbol();
79 OS.EmitAssignment(ABS, Expr);
80 return MCSymbolRefExpr::Create(ABS, Context);
83 raw_ostream &MCStreamer::GetCommentOS() {
84 // By default, discard comments.
88 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
90 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
91 for (auto &FI : DwarfFrameInfos)
92 FI.CompactUnwindEncoding =
93 (MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
96 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
97 const MCSymbol *Label, int PointerSize) {
98 // emit the sequence to set the address
99 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
100 EmitULEB128IntValue(PointerSize + 1);
101 EmitIntValue(dwarf::DW_LNE_set_address, 1);
102 EmitSymbolValue(Label, PointerSize);
104 // emit the sequence for the LineDelta (from 1) and a zero address delta.
105 MCDwarfLineAddr::Emit(this, LineDelta, 0);
108 /// EmitIntValue - Special case of EmitValue that avoids the client having to
109 /// pass in a MCExpr for constant integers.
110 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
111 assert(Size <= 8 && "Invalid size");
112 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
115 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
116 for (unsigned i = 0; i != Size; ++i) {
117 unsigned index = isLittleEndian ? i : (Size - i - 1);
118 buf[i] = uint8_t(Value >> (index * 8));
120 EmitBytes(StringRef(buf, Size));
123 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
124 /// client having to pass in a MCExpr for constant integers.
125 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
126 SmallString<128> Tmp;
127 raw_svector_ostream OSE(Tmp);
128 encodeULEB128(Value, OSE, Padding);
129 EmitBytes(OSE.str());
132 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
133 /// client having to pass in a MCExpr for constant integers.
134 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
135 SmallString<128> Tmp;
136 raw_svector_ostream OSE(Tmp);
137 encodeSLEB128(Value, OSE);
138 EmitBytes(OSE.str());
141 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
142 const MCExpr *ABS = forceExpAbs(*this, Value);
143 EmitValue(ABS, Size);
147 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
149 EmitValueImpl(Value, Size, Loc);
152 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
153 bool IsSectionRelative) {
154 assert((!IsSectionRelative || Size == 4) &&
155 "SectionRelative value requires 4-bytes");
157 if (!IsSectionRelative)
158 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
160 EmitCOFFSecRel32(Sym);
163 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
164 report_fatal_error("unsupported directive in streamer");
167 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
168 report_fatal_error("unsupported directive in streamer");
171 /// EmitFill - Emit NumBytes bytes worth of the value specified by
172 /// FillValue. This implements directives such as '.space'.
173 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
174 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
175 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
179 /// The implementation in this class just redirects to EmitFill.
180 void MCStreamer::EmitZeros(uint64_t NumBytes) {
181 EmitFill(NumBytes, 0);
184 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
186 StringRef Filename, unsigned CUID) {
187 return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID);
190 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
191 unsigned Column, unsigned Flags,
193 unsigned Discriminator,
194 StringRef FileName) {
195 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
199 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
200 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
201 if (!Table.getLabel()) {
202 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
204 Context.GetOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
206 return Table.getLabel();
209 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
210 if (DwarfFrameInfos.empty())
212 return &DwarfFrameInfos.back();
215 void MCStreamer::EnsureValidDwarfFrame() {
216 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
217 if (!CurFrame || CurFrame->End)
218 report_fatal_error("No open frame");
221 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
222 MCSymbol *EHSymbol) {
225 void MCStreamer::InitSections() {
226 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
229 void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
231 Symbol->setSection(*Section);
233 Symbol->setUndefined();
235 // As we emit symbols into a section, track the order so that they can
236 // be sorted upon later. Zero is reserved to mean 'unemitted'.
237 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
240 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
241 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
242 assert(getCurrentSection().first && "Cannot emit before setting section!");
243 AssignSection(Symbol, getCurrentSection().first);
245 MCTargetStreamer *TS = getTargetStreamer();
247 TS->emitLabel(Symbol);
250 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
251 EnsureValidDwarfFrame();
252 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
253 CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
256 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
260 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
261 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
262 if (CurFrame && !CurFrame->End)
263 report_fatal_error("Starting a frame before finishing the previous one!");
265 MCDwarfFrameInfo Frame;
266 Frame.IsSimple = IsSimple;
267 EmitCFIStartProcImpl(Frame);
269 DwarfFrameInfos.push_back(Frame);
272 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
275 void MCStreamer::EmitCFIEndProc() {
276 EnsureValidDwarfFrame();
277 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
278 EmitCFIEndProcImpl(*CurFrame);
281 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
282 // Put a dummy non-null value in Frame.End to mark that this frame has been
284 Frame.End = (MCSymbol *) 1;
287 MCSymbol *MCStreamer::EmitCFICommon() {
288 EnsureValidDwarfFrame();
289 MCSymbol *Label = getContext().CreateTempSymbol();
294 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
295 MCSymbol *Label = EmitCFICommon();
296 MCCFIInstruction Instruction =
297 MCCFIInstruction::createDefCfa(Label, Register, Offset);
298 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
299 CurFrame->Instructions.push_back(Instruction);
302 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
303 MCSymbol *Label = EmitCFICommon();
304 MCCFIInstruction Instruction =
305 MCCFIInstruction::createDefCfaOffset(Label, Offset);
306 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
307 CurFrame->Instructions.push_back(Instruction);
310 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
311 MCSymbol *Label = EmitCFICommon();
312 MCCFIInstruction Instruction =
313 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
314 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
315 CurFrame->Instructions.push_back(Instruction);
318 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
319 MCSymbol *Label = EmitCFICommon();
320 MCCFIInstruction Instruction =
321 MCCFIInstruction::createDefCfaRegister(Label, Register);
322 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
323 CurFrame->Instructions.push_back(Instruction);
326 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
327 MCSymbol *Label = EmitCFICommon();
328 MCCFIInstruction Instruction =
329 MCCFIInstruction::createOffset(Label, Register, Offset);
330 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
331 CurFrame->Instructions.push_back(Instruction);
334 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
335 MCSymbol *Label = EmitCFICommon();
336 MCCFIInstruction Instruction =
337 MCCFIInstruction::createRelOffset(Label, Register, Offset);
338 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
339 CurFrame->Instructions.push_back(Instruction);
342 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
344 EnsureValidDwarfFrame();
345 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
346 CurFrame->Personality = Sym;
347 CurFrame->PersonalityEncoding = Encoding;
350 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
351 EnsureValidDwarfFrame();
352 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
353 CurFrame->Lsda = Sym;
354 CurFrame->LsdaEncoding = Encoding;
357 void MCStreamer::EmitCFIRememberState() {
358 MCSymbol *Label = EmitCFICommon();
359 MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
360 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
361 CurFrame->Instructions.push_back(Instruction);
364 void MCStreamer::EmitCFIRestoreState() {
365 // FIXME: Error if there is no matching cfi_remember_state.
366 MCSymbol *Label = EmitCFICommon();
367 MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
368 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
369 CurFrame->Instructions.push_back(Instruction);
372 void MCStreamer::EmitCFISameValue(int64_t Register) {
373 MCSymbol *Label = EmitCFICommon();
374 MCCFIInstruction Instruction =
375 MCCFIInstruction::createSameValue(Label, Register);
376 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
377 CurFrame->Instructions.push_back(Instruction);
380 void MCStreamer::EmitCFIRestore(int64_t Register) {
381 MCSymbol *Label = EmitCFICommon();
382 MCCFIInstruction Instruction =
383 MCCFIInstruction::createRestore(Label, Register);
384 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
385 CurFrame->Instructions.push_back(Instruction);
388 void MCStreamer::EmitCFIEscape(StringRef Values) {
389 MCSymbol *Label = EmitCFICommon();
390 MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
391 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
392 CurFrame->Instructions.push_back(Instruction);
395 void MCStreamer::EmitCFISignalFrame() {
396 EnsureValidDwarfFrame();
397 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
398 CurFrame->IsSignalFrame = true;
401 void MCStreamer::EmitCFIUndefined(int64_t Register) {
402 MCSymbol *Label = EmitCFICommon();
403 MCCFIInstruction Instruction =
404 MCCFIInstruction::createUndefined(Label, Register);
405 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
406 CurFrame->Instructions.push_back(Instruction);
409 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
410 MCSymbol *Label = EmitCFICommon();
411 MCCFIInstruction Instruction =
412 MCCFIInstruction::createRegister(Label, Register1, Register2);
413 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
414 CurFrame->Instructions.push_back(Instruction);
417 void MCStreamer::EmitCFIWindowSave() {
418 MCSymbol *Label = EmitCFICommon();
419 MCCFIInstruction Instruction =
420 MCCFIInstruction::createWindowSave(Label);
421 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
422 CurFrame->Instructions.push_back(Instruction);
425 void MCStreamer::EnsureValidWinFrameInfo() {
426 if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
427 report_fatal_error("No open Win64 EH frame function!");
430 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
431 if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
432 report_fatal_error("Starting a function before ending the previous one!");
434 MCSymbol *StartProc = getContext().CreateTempSymbol();
435 EmitLabel(StartProc);
437 WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));
438 CurrentWinFrameInfo = WinFrameInfos.back();
441 void MCStreamer::EmitWinCFIEndProc() {
442 EnsureValidWinFrameInfo();
443 if (CurrentWinFrameInfo->ChainedParent)
444 report_fatal_error("Not all chained regions terminated!");
446 MCSymbol *Label = getContext().CreateTempSymbol();
448 CurrentWinFrameInfo->End = Label;
451 void MCStreamer::EmitWinCFIStartChained() {
452 EnsureValidWinFrameInfo();
454 MCSymbol *StartProc = getContext().CreateTempSymbol();
455 EmitLabel(StartProc);
457 WinFrameInfos.push_back(new WinEH::FrameInfo(CurrentWinFrameInfo->Function,
458 StartProc, CurrentWinFrameInfo));
459 CurrentWinFrameInfo = WinFrameInfos.back();
462 void MCStreamer::EmitWinCFIEndChained() {
463 EnsureValidWinFrameInfo();
464 if (!CurrentWinFrameInfo->ChainedParent)
465 report_fatal_error("End of a chained region outside a chained region!");
467 MCSymbol *Label = getContext().CreateTempSymbol();
470 CurrentWinFrameInfo->End = Label;
471 CurrentWinFrameInfo =
472 const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->ChainedParent);
475 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
477 EnsureValidWinFrameInfo();
478 if (CurrentWinFrameInfo->ChainedParent)
479 report_fatal_error("Chained unwind areas can't have handlers!");
480 CurrentWinFrameInfo->ExceptionHandler = Sym;
481 if (!Except && !Unwind)
482 report_fatal_error("Don't know what kind of handler this is!");
484 CurrentWinFrameInfo->HandlesUnwind = true;
486 CurrentWinFrameInfo->HandlesExceptions = true;
489 void MCStreamer::EmitWinEHHandlerData() {
490 EnsureValidWinFrameInfo();
491 if (CurrentWinFrameInfo->ChainedParent)
492 report_fatal_error("Chained unwind areas can't have handlers!");
495 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
496 EnsureValidWinFrameInfo();
498 MCSymbol *Label = getContext().CreateTempSymbol();
501 WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
502 CurrentWinFrameInfo->Instructions.push_back(Inst);
505 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
506 EnsureValidWinFrameInfo();
507 if (CurrentWinFrameInfo->LastFrameInst >= 0)
508 report_fatal_error("Frame register and offset already specified!");
510 report_fatal_error("Misaligned frame pointer offset!");
512 report_fatal_error("Frame offset must be less than or equal to 240!");
514 MCSymbol *Label = getContext().CreateTempSymbol();
517 WinEH::Instruction Inst =
518 Win64EH::Instruction::SetFPReg(Label, Register, Offset);
519 CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
520 CurrentWinFrameInfo->Instructions.push_back(Inst);
523 void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
524 EnsureValidWinFrameInfo();
526 report_fatal_error("Allocation size must be non-zero!");
528 report_fatal_error("Misaligned stack allocation!");
530 MCSymbol *Label = getContext().CreateTempSymbol();
533 WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
534 CurrentWinFrameInfo->Instructions.push_back(Inst);
537 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
538 EnsureValidWinFrameInfo();
540 report_fatal_error("Misaligned saved register offset!");
542 MCSymbol *Label = getContext().CreateTempSymbol();
545 WinEH::Instruction Inst =
546 Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
547 CurrentWinFrameInfo->Instructions.push_back(Inst);
550 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
551 EnsureValidWinFrameInfo();
553 report_fatal_error("Misaligned saved vector register offset!");
555 MCSymbol *Label = getContext().CreateTempSymbol();
558 WinEH::Instruction Inst =
559 Win64EH::Instruction::SaveXMM(Label, Register, Offset);
560 CurrentWinFrameInfo->Instructions.push_back(Inst);
563 void MCStreamer::EmitWinCFIPushFrame(bool Code) {
564 EnsureValidWinFrameInfo();
565 if (CurrentWinFrameInfo->Instructions.size() > 0)
566 report_fatal_error("If present, PushMachFrame must be the first UOP");
568 MCSymbol *Label = getContext().CreateTempSymbol();
571 WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
572 CurrentWinFrameInfo->Instructions.push_back(Inst);
575 void MCStreamer::EmitWinCFIEndProlog() {
576 EnsureValidWinFrameInfo();
578 MCSymbol *Label = getContext().CreateTempSymbol();
581 CurrentWinFrameInfo->PrologEnd = Label;
584 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
587 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
590 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
591 /// the specified string in the output .s file. This capability is
592 /// indicated by the hasRawTextSupport() predicate.
593 void MCStreamer::EmitRawTextImpl(StringRef String) {
594 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
595 " something must not be fully mc'ized\n";
599 void MCStreamer::EmitRawText(const Twine &T) {
600 SmallString<128> Str;
601 EmitRawTextImpl(T.toStringRef(Str));
604 void MCStreamer::EmitWindowsUnwindTables() {
607 void MCStreamer::Finish() {
608 if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
609 report_fatal_error("Unfinished frame!");
611 MCTargetStreamer *TS = getTargetStreamer();
618 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
619 visitUsedExpr(*Value);
620 Symbol->setVariableValue(Value);
622 MCTargetStreamer *TS = getTargetStreamer();
624 TS->emitAssignment(Symbol, Value);
627 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
630 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
631 switch (Expr.getKind()) {
633 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
636 case MCExpr::Constant:
639 case MCExpr::Binary: {
640 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
641 visitUsedExpr(*BE.getLHS());
642 visitUsedExpr(*BE.getRHS());
646 case MCExpr::SymbolRef:
647 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
651 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
656 void MCStreamer::EmitInstruction(const MCInst &Inst,
657 const MCSubtargetInfo &STI) {
659 for (unsigned i = Inst.getNumOperands(); i--;)
660 if (Inst.getOperand(i).isExpr())
661 visitUsedExpr(*Inst.getOperand(i).getExpr());
664 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
665 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
666 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
667 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
668 void MCStreamer::EndCOFFSymbolDef() {}
669 void MCStreamer::EmitFileDirective(StringRef Filename) {}
670 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
671 void MCStreamer::EmitCOFFSymbolType(int Type) {}
672 void MCStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
673 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
674 unsigned ByteAlignment) {}
675 void MCStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
676 uint64_t Size, unsigned ByteAlignment) {}
677 void MCStreamer::ChangeSection(const MCSection *, const MCExpr *) {}
678 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
679 void MCStreamer::EmitBytes(StringRef Data) {}
680 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
682 visitUsedExpr(*Value);
684 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
685 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
686 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
688 unsigned MaxBytesToEmit) {}
689 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
690 unsigned MaxBytesToEmit) {}
691 bool MCStreamer::EmitValueToOffset(const MCExpr *Offset, unsigned char Value) {
694 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
695 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
696 void MCStreamer::FinishImpl() {}
697 void MCStreamer::EmitBundleUnlock() {}