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/Support/ErrorHandling.h"
21 #include "llvm/Support/LEB128.h"
22 #include "llvm/Support/raw_ostream.h"
26 // Pin the vtables to this file.
27 MCTargetStreamer::~MCTargetStreamer() {}
29 MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
30 S.setTargetStreamer(this);
33 void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
35 void MCTargetStreamer::finish() {}
37 void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
39 MCStreamer::MCStreamer(MCContext &Ctx)
40 : Context(Ctx), CurrentWinFrameInfo(nullptr) {
41 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
44 MCStreamer::~MCStreamer() {
45 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
46 delete WinFrameInfos[i];
49 void MCStreamer::reset() {
50 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
51 delete WinFrameInfos[i];
52 WinFrameInfos.clear();
53 CurrentWinFrameInfo = nullptr;
55 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
58 const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context,
61 MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
63 MCSymbolRefExpr::Create(A, Variant, Context);
65 MCSymbolRefExpr::Create(B, Variant, Context);
66 const MCExpr *AddrDelta =
67 MCBinaryExpr::Create(MCBinaryExpr::Sub, ARef, BRef, Context);
71 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
72 assert(!isa<MCSymbolRefExpr>(Expr));
73 if (Context.getAsmInfo()->hasAggressiveSymbolFolding())
76 MCSymbol *ABS = Context.CreateTempSymbol();
77 EmitAssignment(ABS, Expr);
78 return MCSymbolRefExpr::Create(ABS, Context);
81 raw_ostream &MCStreamer::GetCommentOS() {
82 // By default, discard comments.
86 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
88 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
89 for (auto &FI : DwarfFrameInfos)
90 FI.CompactUnwindEncoding =
91 (MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
94 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
95 const MCSymbol *Label, int PointerSize) {
96 // emit the sequence to set the address
97 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
98 EmitULEB128IntValue(PointerSize + 1);
99 EmitIntValue(dwarf::DW_LNE_set_address, 1);
100 EmitSymbolValue(Label, PointerSize);
102 // emit the sequence for the LineDelta (from 1) and a zero address delta.
103 MCDwarfLineAddr::Emit(this, LineDelta, 0);
106 /// EmitIntValue - Special case of EmitValue that avoids the client having to
107 /// pass in a MCExpr for constant integers.
108 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
109 assert(Size <= 8 && "Invalid size");
110 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
113 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
114 for (unsigned i = 0; i != Size; ++i) {
115 unsigned index = isLittleEndian ? i : (Size - i - 1);
116 buf[i] = uint8_t(Value >> (index * 8));
118 EmitBytes(StringRef(buf, Size));
121 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
122 /// client having to pass in a MCExpr for constant integers.
123 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
124 SmallString<128> Tmp;
125 raw_svector_ostream OSE(Tmp);
126 encodeULEB128(Value, OSE, Padding);
127 EmitBytes(OSE.str());
130 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
131 /// client having to pass in a MCExpr for constant integers.
132 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
133 SmallString<128> Tmp;
134 raw_svector_ostream OSE(Tmp);
135 encodeSLEB128(Value, OSE);
136 EmitBytes(OSE.str());
139 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
140 const MCExpr *ABS = ForceExpAbs(Value);
141 EmitValue(ABS, Size);
145 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
147 EmitValueImpl(Value, Size, Loc);
150 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size) {
151 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
154 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
155 report_fatal_error("unsupported directive in streamer");
158 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
159 report_fatal_error("unsupported directive in streamer");
162 /// EmitFill - Emit NumBytes bytes worth of the value specified by
163 /// FillValue. This implements directives such as '.space'.
164 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
165 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
166 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
170 /// The implementation in this class just redirects to EmitFill.
171 void MCStreamer::EmitZeros(uint64_t NumBytes) {
172 EmitFill(NumBytes, 0);
175 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
177 StringRef Filename, unsigned CUID) {
178 return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID);
181 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
182 unsigned Column, unsigned Flags,
184 unsigned Discriminator,
185 StringRef FileName) {
186 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
190 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
191 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
192 if (!Table.getLabel()) {
193 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
195 Context.GetOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
197 return Table.getLabel();
200 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
201 if (DwarfFrameInfos.empty())
203 return &DwarfFrameInfos.back();
206 void MCStreamer::EnsureValidDwarfFrame() {
207 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
208 if (!CurFrame || CurFrame->End)
209 report_fatal_error("No open frame");
212 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
213 MCSymbol *EHSymbol) {
216 void MCStreamer::InitSections() {
217 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
220 void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
222 Symbol->setSection(*Section);
224 Symbol->setUndefined();
226 // As we emit symbols into a section, track the order so that they can
227 // be sorted upon later. Zero is reserved to mean 'unemitted'.
228 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
231 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
232 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
233 assert(getCurrentSection().first && "Cannot emit before setting section!");
234 AssignSection(Symbol, getCurrentSection().first);
236 MCTargetStreamer *TS = getTargetStreamer();
238 TS->emitLabel(Symbol);
241 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
242 EnsureValidDwarfFrame();
243 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
244 CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
247 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
251 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
252 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
253 if (CurFrame && !CurFrame->End)
254 report_fatal_error("Starting a frame before finishing the previous one!");
256 MCDwarfFrameInfo Frame;
257 Frame.IsSimple = IsSimple;
258 EmitCFIStartProcImpl(Frame);
260 DwarfFrameInfos.push_back(Frame);
263 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
266 void MCStreamer::EmitCFIEndProc() {
267 EnsureValidDwarfFrame();
268 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
269 EmitCFIEndProcImpl(*CurFrame);
272 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
273 // Put a dummy non-null value in Frame.End to mark that this frame has been
275 Frame.End = (MCSymbol *) 1;
278 MCSymbol *MCStreamer::EmitCFICommon() {
279 EnsureValidDwarfFrame();
280 MCSymbol *Label = getContext().CreateTempSymbol();
285 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
286 MCSymbol *Label = EmitCFICommon();
287 MCCFIInstruction Instruction =
288 MCCFIInstruction::createDefCfa(Label, Register, Offset);
289 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
290 CurFrame->Instructions.push_back(Instruction);
293 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
294 MCSymbol *Label = EmitCFICommon();
295 MCCFIInstruction Instruction =
296 MCCFIInstruction::createDefCfaOffset(Label, Offset);
297 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
298 CurFrame->Instructions.push_back(Instruction);
301 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
302 MCSymbol *Label = EmitCFICommon();
303 MCCFIInstruction Instruction =
304 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
305 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
306 CurFrame->Instructions.push_back(Instruction);
309 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
310 MCSymbol *Label = EmitCFICommon();
311 MCCFIInstruction Instruction =
312 MCCFIInstruction::createDefCfaRegister(Label, Register);
313 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
314 CurFrame->Instructions.push_back(Instruction);
317 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
318 MCSymbol *Label = EmitCFICommon();
319 MCCFIInstruction Instruction =
320 MCCFIInstruction::createOffset(Label, Register, Offset);
321 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
322 CurFrame->Instructions.push_back(Instruction);
325 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
326 MCSymbol *Label = EmitCFICommon();
327 MCCFIInstruction Instruction =
328 MCCFIInstruction::createRelOffset(Label, Register, Offset);
329 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
330 CurFrame->Instructions.push_back(Instruction);
333 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
335 EnsureValidDwarfFrame();
336 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
337 CurFrame->Personality = Sym;
338 CurFrame->PersonalityEncoding = Encoding;
341 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
342 EnsureValidDwarfFrame();
343 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
344 CurFrame->Lsda = Sym;
345 CurFrame->LsdaEncoding = Encoding;
348 void MCStreamer::EmitCFIRememberState() {
349 MCSymbol *Label = EmitCFICommon();
350 MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
351 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
352 CurFrame->Instructions.push_back(Instruction);
355 void MCStreamer::EmitCFIRestoreState() {
356 // FIXME: Error if there is no matching cfi_remember_state.
357 MCSymbol *Label = EmitCFICommon();
358 MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
359 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
360 CurFrame->Instructions.push_back(Instruction);
363 void MCStreamer::EmitCFISameValue(int64_t Register) {
364 MCSymbol *Label = EmitCFICommon();
365 MCCFIInstruction Instruction =
366 MCCFIInstruction::createSameValue(Label, Register);
367 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
368 CurFrame->Instructions.push_back(Instruction);
371 void MCStreamer::EmitCFIRestore(int64_t Register) {
372 MCSymbol *Label = EmitCFICommon();
373 MCCFIInstruction Instruction =
374 MCCFIInstruction::createRestore(Label, Register);
375 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
376 CurFrame->Instructions.push_back(Instruction);
379 void MCStreamer::EmitCFIEscape(StringRef Values) {
380 MCSymbol *Label = EmitCFICommon();
381 MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
382 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
383 CurFrame->Instructions.push_back(Instruction);
386 void MCStreamer::EmitCFISignalFrame() {
387 EnsureValidDwarfFrame();
388 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
389 CurFrame->IsSignalFrame = true;
392 void MCStreamer::EmitCFIUndefined(int64_t Register) {
393 MCSymbol *Label = EmitCFICommon();
394 MCCFIInstruction Instruction =
395 MCCFIInstruction::createUndefined(Label, Register);
396 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
397 CurFrame->Instructions.push_back(Instruction);
400 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
401 MCSymbol *Label = EmitCFICommon();
402 MCCFIInstruction Instruction =
403 MCCFIInstruction::createRegister(Label, Register1, Register2);
404 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
405 CurFrame->Instructions.push_back(Instruction);
408 void MCStreamer::EmitCFIWindowSave() {
409 MCSymbol *Label = EmitCFICommon();
410 MCCFIInstruction Instruction =
411 MCCFIInstruction::createWindowSave(Label);
412 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
413 CurFrame->Instructions.push_back(Instruction);
416 void MCStreamer::EnsureValidWinFrameInfo() {
417 if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
418 report_fatal_error("No open Win64 EH frame function!");
421 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
422 if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
423 report_fatal_error("Starting a function before ending the previous one!");
424 MCWinFrameInfo *Frame = new MCWinFrameInfo;
425 Frame->Begin = getContext().CreateTempSymbol();
426 Frame->Function = Symbol;
427 EmitLabel(Frame->Begin);
428 WinFrameInfos.push_back(Frame);
429 CurrentWinFrameInfo = WinFrameInfos.back();
432 void MCStreamer::EmitWinCFIEndProc() {
433 EnsureValidWinFrameInfo();
434 if (CurrentWinFrameInfo->ChainedParent)
435 report_fatal_error("Not all chained regions terminated!");
436 CurrentWinFrameInfo->End = getContext().CreateTempSymbol();
437 EmitLabel(CurrentWinFrameInfo->End);
440 void MCStreamer::EmitWinCFIStartChained() {
441 EnsureValidWinFrameInfo();
442 MCWinFrameInfo *Frame = new MCWinFrameInfo;
443 Frame->Begin = getContext().CreateTempSymbol();
444 Frame->Function = CurrentWinFrameInfo->Function;
445 Frame->ChainedParent = CurrentWinFrameInfo;
446 EmitLabel(Frame->Begin);
447 WinFrameInfos.push_back(Frame);
448 CurrentWinFrameInfo = WinFrameInfos.back();
451 void MCStreamer::EmitWinCFIEndChained() {
452 EnsureValidWinFrameInfo();
453 if (!CurrentWinFrameInfo->ChainedParent)
454 report_fatal_error("End of a chained region outside a chained region!");
455 CurrentWinFrameInfo->End = getContext().CreateTempSymbol();
456 EmitLabel(CurrentWinFrameInfo->End);
457 CurrentWinFrameInfo = CurrentWinFrameInfo->ChainedParent;
460 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
462 EnsureValidWinFrameInfo();
463 if (CurrentWinFrameInfo->ChainedParent)
464 report_fatal_error("Chained unwind areas can't have handlers!");
465 CurrentWinFrameInfo->ExceptionHandler = Sym;
466 if (!Except && !Unwind)
467 report_fatal_error("Don't know what kind of handler this is!");
469 CurrentWinFrameInfo->HandlesUnwind = true;
471 CurrentWinFrameInfo->HandlesExceptions = true;
474 void MCStreamer::EmitWinEHHandlerData() {
475 EnsureValidWinFrameInfo();
476 if (CurrentWinFrameInfo->ChainedParent)
477 report_fatal_error("Chained unwind areas can't have handlers!");
480 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
481 EnsureValidWinFrameInfo();
482 MCSymbol *Label = getContext().CreateTempSymbol();
483 MCWin64EHInstruction Inst(Win64EH::UOP_PushNonVol, Label, Register);
485 CurrentWinFrameInfo->Instructions.push_back(Inst);
488 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
489 EnsureValidWinFrameInfo();
490 if (CurrentWinFrameInfo->LastFrameInst >= 0)
491 report_fatal_error("Frame register and offset already specified!");
493 report_fatal_error("Misaligned frame pointer offset!");
495 report_fatal_error("Frame offset must be less than or equal to 240!");
496 MCSymbol *Label = getContext().CreateTempSymbol();
497 MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Label, Register, Offset);
499 CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
500 CurrentWinFrameInfo->Instructions.push_back(Inst);
503 void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
504 EnsureValidWinFrameInfo();
506 report_fatal_error("Allocation size must be non-zero!");
508 report_fatal_error("Misaligned stack allocation!");
509 MCSymbol *Label = getContext().CreateTempSymbol();
510 MCWin64EHInstruction Inst(Label, Size);
512 CurrentWinFrameInfo->Instructions.push_back(Inst);
515 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
516 EnsureValidWinFrameInfo();
518 report_fatal_error("Misaligned saved register offset!");
519 MCSymbol *Label = getContext().CreateTempSymbol();
520 MCWin64EHInstruction Inst(
521 Offset > 512*1024-8 ? Win64EH::UOP_SaveNonVolBig : Win64EH::UOP_SaveNonVol,
522 Label, Register, Offset);
524 CurrentWinFrameInfo->Instructions.push_back(Inst);
527 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
528 EnsureValidWinFrameInfo();
530 report_fatal_error("Misaligned saved vector register offset!");
531 MCSymbol *Label = getContext().CreateTempSymbol();
532 MCWin64EHInstruction Inst(
533 Offset > 512*1024-16 ? Win64EH::UOP_SaveXMM128Big : Win64EH::UOP_SaveXMM128,
534 Label, Register, Offset);
536 CurrentWinFrameInfo->Instructions.push_back(Inst);
539 void MCStreamer::EmitWinCFIPushFrame(bool Code) {
540 EnsureValidWinFrameInfo();
541 if (CurrentWinFrameInfo->Instructions.size() > 0)
542 report_fatal_error("If present, PushMachFrame must be the first UOP");
543 MCSymbol *Label = getContext().CreateTempSymbol();
544 MCWin64EHInstruction Inst(Win64EH::UOP_PushMachFrame, Label, Code);
546 CurrentWinFrameInfo->Instructions.push_back(Inst);
549 void MCStreamer::EmitWinCFIEndProlog() {
550 EnsureValidWinFrameInfo();
551 CurrentWinFrameInfo->PrologEnd = getContext().CreateTempSymbol();
552 EmitLabel(CurrentWinFrameInfo->PrologEnd);
555 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
558 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
561 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
562 /// the specified string in the output .s file. This capability is
563 /// indicated by the hasRawTextSupport() predicate.
564 void MCStreamer::EmitRawTextImpl(StringRef String) {
565 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
566 " something must not be fully mc'ized\n";
570 void MCStreamer::EmitRawText(const Twine &T) {
571 SmallString<128> Str;
572 EmitRawTextImpl(T.toStringRef(Str));
575 void MCStreamer::EmitWindowsUnwindTables() {
576 if (!getNumWinFrameInfos())
579 MCWin64EHUnwindEmitter::Emit(*this);
582 void MCStreamer::Finish() {
583 if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
584 report_fatal_error("Unfinished frame!");
586 MCTargetStreamer *TS = getTargetStreamer();
593 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
594 visitUsedExpr(*Value);
595 Symbol->setVariableValue(Value);
597 MCTargetStreamer *TS = getTargetStreamer();
599 TS->emitAssignment(Symbol, Value);
602 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
605 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
606 switch (Expr.getKind()) {
608 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
611 case MCExpr::Constant:
614 case MCExpr::Binary: {
615 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
616 visitUsedExpr(*BE.getLHS());
617 visitUsedExpr(*BE.getRHS());
621 case MCExpr::SymbolRef:
622 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
626 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
631 void MCStreamer::EmitInstruction(const MCInst &Inst,
632 const MCSubtargetInfo &STI) {
634 for (unsigned i = Inst.getNumOperands(); i--;)
635 if (Inst.getOperand(i).isExpr())
636 visitUsedExpr(*Inst.getOperand(i).getExpr());
639 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
640 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
641 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
642 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
643 void MCStreamer::EndCOFFSymbolDef() {}
644 void MCStreamer::EmitFileDirective(StringRef Filename) {}
645 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
646 void MCStreamer::EmitCOFFSymbolType(int Type) {}
647 void MCStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
648 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
649 unsigned ByteAlignment) {}
650 void MCStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
651 uint64_t Size, unsigned ByteAlignment) {}
652 void MCStreamer::ChangeSection(const MCSection *, const MCExpr *) {}
653 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
654 void MCStreamer::EmitBytes(StringRef Data) {}
655 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
657 visitUsedExpr(*Value);
659 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
660 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
661 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
663 unsigned MaxBytesToEmit) {}
664 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
665 unsigned MaxBytesToEmit) {}
666 bool MCStreamer::EmitValueToOffset(const MCExpr *Offset, unsigned char Value) {
669 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
670 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
671 void MCStreamer::FinishImpl() {}
672 void MCStreamer::EmitBundleUnlock() {}