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/MCInst.h"
18 #include "llvm/MC/MCInstPrinter.h"
19 #include "llvm/MC/MCObjectFileInfo.h"
20 #include "llvm/MC/MCObjectWriter.h"
21 #include "llvm/MC/MCSection.h"
22 #include "llvm/MC/MCSymbol.h"
23 #include "llvm/MC/MCWin64EH.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/LEB128.h"
26 #include "llvm/Support/raw_ostream.h"
30 // Pin the vtables to this file.
31 MCTargetStreamer::~MCTargetStreamer() {}
33 MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
34 S.setTargetStreamer(this);
37 void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
39 void MCTargetStreamer::finish() {}
41 void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
43 MCStreamer::MCStreamer(MCContext &Ctx)
44 : Context(Ctx), CurrentWinFrameInfo(nullptr) {
45 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
48 MCStreamer::~MCStreamer() {
49 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
50 delete WinFrameInfos[i];
53 void MCStreamer::reset() {
54 DwarfFrameInfos.clear();
55 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
56 delete WinFrameInfos[i];
57 WinFrameInfos.clear();
58 CurrentWinFrameInfo = nullptr;
59 SymbolOrdering.clear();
61 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
64 raw_ostream &MCStreamer::GetCommentOS() {
65 // By default, discard comments.
69 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
71 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
72 for (auto &FI : DwarfFrameInfos)
73 FI.CompactUnwindEncoding =
74 (MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
77 /// EmitIntValue - Special case of EmitValue that avoids the client having to
78 /// pass in a MCExpr for constant integers.
79 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
80 assert(1 <= Size && Size <= 8 && "Invalid size");
81 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
84 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
85 for (unsigned i = 0; i != Size; ++i) {
86 unsigned index = isLittleEndian ? i : (Size - i - 1);
87 buf[i] = uint8_t(Value >> (index * 8));
89 EmitBytes(StringRef(buf, Size));
92 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
93 /// client having to pass in a MCExpr for constant integers.
94 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
96 raw_svector_ostream OSE(Tmp);
97 encodeULEB128(Value, OSE, Padding);
101 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
102 /// client having to pass in a MCExpr for constant integers.
103 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
104 SmallString<128> Tmp;
105 raw_svector_ostream OSE(Tmp);
106 encodeSLEB128(Value, OSE);
107 EmitBytes(OSE.str());
110 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
112 EmitValueImpl(Value, Size, Loc);
115 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
116 bool IsSectionRelative) {
117 assert((!IsSectionRelative || Size == 4) &&
118 "SectionRelative value requires 4-bytes");
120 if (!IsSectionRelative)
121 EmitValueImpl(MCSymbolRefExpr::create(Sym, getContext()), Size);
123 EmitCOFFSecRel32(Sym);
126 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
127 report_fatal_error("unsupported directive in streamer");
130 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
131 report_fatal_error("unsupported directive in streamer");
134 /// EmitFill - Emit NumBytes bytes worth of the value specified by
135 /// FillValue. This implements directives such as '.space'.
136 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
137 const MCExpr *E = MCConstantExpr::create(FillValue, getContext());
138 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
142 /// The implementation in this class just redirects to EmitFill.
143 void MCStreamer::EmitZeros(uint64_t NumBytes) {
144 EmitFill(NumBytes, 0);
147 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
149 StringRef Filename, unsigned CUID) {
150 return getContext().getDwarfFile(Directory, Filename, FileNo, CUID);
153 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
154 unsigned Column, unsigned Flags,
156 unsigned Discriminator,
157 StringRef FileName) {
158 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
162 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
163 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
164 if (!Table.getLabel()) {
165 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
167 Context.getOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
169 return Table.getLabel();
172 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
173 if (DwarfFrameInfos.empty())
175 return &DwarfFrameInfos.back();
178 void MCStreamer::EnsureValidDwarfFrame() {
179 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
180 if (!CurFrame || CurFrame->End)
181 report_fatal_error("No open frame");
184 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
185 MCSymbol *EHSymbol) {
188 void MCStreamer::InitSections(bool NoExecStack) {
189 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
192 void MCStreamer::AssignSection(MCSymbol *Symbol, MCSection *Section) {
194 Symbol->setSection(*Section);
196 Symbol->setUndefined();
198 // As we emit symbols into a section, track the order so that they can
199 // be sorted upon later. Zero is reserved to mean 'unemitted'.
200 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
203 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
204 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
205 assert(getCurrentSection().first && "Cannot emit before setting section!");
206 AssignSection(Symbol, getCurrentSection().first);
208 MCTargetStreamer *TS = getTargetStreamer();
210 TS->emitLabel(Symbol);
213 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
217 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
218 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
219 if (CurFrame && !CurFrame->End)
220 report_fatal_error("Starting a frame before finishing the previous one!");
222 MCDwarfFrameInfo Frame;
223 Frame.IsSimple = IsSimple;
224 EmitCFIStartProcImpl(Frame);
226 const MCAsmInfo* MAI = Context.getAsmInfo();
228 for (const MCCFIInstruction& Inst : MAI->getInitialFrameState()) {
229 if (Inst.getOperation() == MCCFIInstruction::OpDefCfa ||
230 Inst.getOperation() == MCCFIInstruction::OpDefCfaRegister) {
231 Frame.CurrentCfaRegister = Inst.getRegister();
236 DwarfFrameInfos.push_back(Frame);
239 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
242 void MCStreamer::EmitCFIEndProc() {
243 EnsureValidDwarfFrame();
244 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
245 EmitCFIEndProcImpl(*CurFrame);
248 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
249 // Put a dummy non-null value in Frame.End to mark that this frame has been
251 Frame.End = (MCSymbol *) 1;
254 MCSymbol *MCStreamer::EmitCFICommon() {
255 EnsureValidDwarfFrame();
256 MCSymbol *Label = getContext().createTempSymbol();
261 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
262 MCSymbol *Label = EmitCFICommon();
263 MCCFIInstruction Instruction =
264 MCCFIInstruction::createDefCfa(Label, Register, Offset);
265 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
266 CurFrame->Instructions.push_back(Instruction);
267 CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
270 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
271 MCSymbol *Label = EmitCFICommon();
272 MCCFIInstruction Instruction =
273 MCCFIInstruction::createDefCfaOffset(Label, Offset);
274 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
275 CurFrame->Instructions.push_back(Instruction);
278 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
279 MCSymbol *Label = EmitCFICommon();
280 MCCFIInstruction Instruction =
281 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
282 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
283 CurFrame->Instructions.push_back(Instruction);
286 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
287 MCSymbol *Label = EmitCFICommon();
288 MCCFIInstruction Instruction =
289 MCCFIInstruction::createDefCfaRegister(Label, Register);
290 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
291 CurFrame->Instructions.push_back(Instruction);
292 CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
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 const MCAsmInfo *MAI = Context.getAsmInfo();
396 if (!MAI->usesWindowsCFI())
397 report_fatal_error(".seh_* directives are not supported on this target");
398 if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
399 report_fatal_error("No open Win64 EH frame function!");
402 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
403 const MCAsmInfo *MAI = Context.getAsmInfo();
404 if (!MAI->usesWindowsCFI())
405 report_fatal_error(".seh_* directives are not supported on this target");
406 if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
407 report_fatal_error("Starting a function before ending the previous one!");
409 MCSymbol *StartProc = getContext().createTempSymbol();
410 EmitLabel(StartProc);
412 WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));
413 CurrentWinFrameInfo = WinFrameInfos.back();
416 void MCStreamer::EmitWinCFIEndProc() {
417 EnsureValidWinFrameInfo();
418 if (CurrentWinFrameInfo->ChainedParent)
419 report_fatal_error("Not all chained regions terminated!");
421 MCSymbol *Label = getContext().createTempSymbol();
423 CurrentWinFrameInfo->End = Label;
426 void MCStreamer::EmitWinCFIStartChained() {
427 EnsureValidWinFrameInfo();
429 MCSymbol *StartProc = getContext().createTempSymbol();
430 EmitLabel(StartProc);
432 WinFrameInfos.push_back(new WinEH::FrameInfo(CurrentWinFrameInfo->Function,
433 StartProc, CurrentWinFrameInfo));
434 CurrentWinFrameInfo = WinFrameInfos.back();
437 void MCStreamer::EmitWinCFIEndChained() {
438 EnsureValidWinFrameInfo();
439 if (!CurrentWinFrameInfo->ChainedParent)
440 report_fatal_error("End of a chained region outside a chained region!");
442 MCSymbol *Label = getContext().createTempSymbol();
445 CurrentWinFrameInfo->End = Label;
446 CurrentWinFrameInfo =
447 const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->ChainedParent);
450 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
452 EnsureValidWinFrameInfo();
453 if (CurrentWinFrameInfo->ChainedParent)
454 report_fatal_error("Chained unwind areas can't have handlers!");
455 CurrentWinFrameInfo->ExceptionHandler = Sym;
456 if (!Except && !Unwind)
457 report_fatal_error("Don't know what kind of handler this is!");
459 CurrentWinFrameInfo->HandlesUnwind = true;
461 CurrentWinFrameInfo->HandlesExceptions = true;
464 void MCStreamer::EmitWinEHHandlerData() {
465 EnsureValidWinFrameInfo();
466 if (CurrentWinFrameInfo->ChainedParent)
467 report_fatal_error("Chained unwind areas can't have handlers!");
470 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
471 EnsureValidWinFrameInfo();
473 MCSymbol *Label = getContext().createTempSymbol();
476 WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
477 CurrentWinFrameInfo->Instructions.push_back(Inst);
480 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
481 EnsureValidWinFrameInfo();
482 if (CurrentWinFrameInfo->LastFrameInst >= 0)
483 report_fatal_error("Frame register and offset already specified!");
485 report_fatal_error("Misaligned frame pointer offset!");
487 report_fatal_error("Frame offset must be less than or equal to 240!");
489 MCSymbol *Label = getContext().createTempSymbol();
492 WinEH::Instruction Inst =
493 Win64EH::Instruction::SetFPReg(Label, Register, Offset);
494 CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
495 CurrentWinFrameInfo->Instructions.push_back(Inst);
498 void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
499 EnsureValidWinFrameInfo();
501 report_fatal_error("Allocation size must be non-zero!");
503 report_fatal_error("Misaligned stack allocation!");
505 MCSymbol *Label = getContext().createTempSymbol();
508 WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
509 CurrentWinFrameInfo->Instructions.push_back(Inst);
512 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
513 EnsureValidWinFrameInfo();
515 report_fatal_error("Misaligned saved register offset!");
517 MCSymbol *Label = getContext().createTempSymbol();
520 WinEH::Instruction Inst =
521 Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
522 CurrentWinFrameInfo->Instructions.push_back(Inst);
525 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
526 EnsureValidWinFrameInfo();
528 report_fatal_error("Misaligned saved vector register offset!");
530 MCSymbol *Label = getContext().createTempSymbol();
533 WinEH::Instruction Inst =
534 Win64EH::Instruction::SaveXMM(Label, Register, Offset);
535 CurrentWinFrameInfo->Instructions.push_back(Inst);
538 void MCStreamer::EmitWinCFIPushFrame(bool Code) {
539 EnsureValidWinFrameInfo();
540 if (CurrentWinFrameInfo->Instructions.size() > 0)
541 report_fatal_error("If present, PushMachFrame must be the first UOP");
543 MCSymbol *Label = getContext().createTempSymbol();
546 WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
547 CurrentWinFrameInfo->Instructions.push_back(Inst);
550 void MCStreamer::EmitWinCFIEndProlog() {
551 EnsureValidWinFrameInfo();
553 MCSymbol *Label = getContext().createTempSymbol();
556 CurrentWinFrameInfo->PrologEnd = Label;
559 void MCStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
562 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
565 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
568 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
569 /// the specified string in the output .s file. This capability is
570 /// indicated by the hasRawTextSupport() predicate.
571 void MCStreamer::EmitRawTextImpl(StringRef String) {
572 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
573 " something must not be fully mc'ized\n";
577 void MCStreamer::EmitRawText(const Twine &T) {
578 SmallString<128> Str;
579 EmitRawTextImpl(T.toStringRef(Str));
582 void MCStreamer::EmitWindowsUnwindTables() {
585 void MCStreamer::Finish() {
586 if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
587 report_fatal_error("Unfinished frame!");
589 MCTargetStreamer *TS = getTargetStreamer();
596 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
597 visitUsedExpr(*Value);
598 Symbol->setVariableValue(Value);
600 MCTargetStreamer *TS = getTargetStreamer();
602 TS->emitAssignment(Symbol, Value);
605 void MCTargetStreamer::prettyPrintAsm(MCInstPrinter &InstPrinter, raw_ostream &OS,
606 const MCInst &Inst, const MCSubtargetInfo &STI) {
607 InstPrinter.printInst(&Inst, OS, "", STI);
610 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
613 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
614 switch (Expr.getKind()) {
616 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
619 case MCExpr::Constant:
622 case MCExpr::Binary: {
623 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
624 visitUsedExpr(*BE.getLHS());
625 visitUsedExpr(*BE.getRHS());
629 case MCExpr::SymbolRef:
630 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
634 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
639 void MCStreamer::EmitInstruction(const MCInst &Inst,
640 const MCSubtargetInfo &STI) {
642 for (unsigned i = Inst.getNumOperands(); i--;)
643 if (Inst.getOperand(i).isExpr())
644 visitUsedExpr(*Inst.getOperand(i).getExpr());
647 void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
649 // Get the Hi-Lo expression.
651 MCBinaryExpr::createSub(MCSymbolRefExpr::create(Hi, Context),
652 MCSymbolRefExpr::create(Lo, Context), Context);
654 const MCAsmInfo *MAI = Context.getAsmInfo();
655 if (!MAI->doesSetDirectiveSuppressesReloc()) {
656 EmitValue(Diff, Size);
660 // Otherwise, emit with .set (aka assignment).
661 MCSymbol *SetLabel = Context.createTempSymbol("set", true);
662 EmitAssignment(SetLabel, Diff);
663 EmitSymbolValue(SetLabel, Size);
666 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
667 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
668 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
669 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
670 void MCStreamer::EndCOFFSymbolDef() {}
671 void MCStreamer::EmitFileDirective(StringRef Filename) {}
672 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
673 void MCStreamer::EmitCOFFSymbolType(int Type) {}
674 void MCStreamer::emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) {}
675 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
676 unsigned ByteAlignment) {}
677 void MCStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
678 uint64_t Size, unsigned ByteAlignment) {}
679 void MCStreamer::ChangeSection(MCSection *, const MCExpr *) {}
680 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
681 void MCStreamer::EmitBytes(StringRef Data) {}
682 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
684 visitUsedExpr(*Value);
686 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
687 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
688 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
690 unsigned MaxBytesToEmit) {}
691 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
692 unsigned MaxBytesToEmit) {}
693 bool MCStreamer::EmitValueToOffset(const MCExpr *Offset, unsigned char Value) {
696 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
697 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
698 void MCStreamer::FinishImpl() {}
699 void MCStreamer::EmitBundleUnlock() {}
701 void MCStreamer::SwitchSection(MCSection *Section, const MCExpr *Subsection) {
702 assert(Section && "Cannot switch to a null section!");
703 MCSectionSubPair curSection = SectionStack.back().first;
704 SectionStack.back().second = curSection;
705 if (MCSectionSubPair(Section, Subsection) != curSection) {
706 ChangeSection(Section, Subsection);
707 SectionStack.back().first = MCSectionSubPair(Section, Subsection);
708 assert(!Section->hasEnded() && "Section already ended");
709 MCSymbol *Sym = Section->getBeginSymbol();
710 if (Sym && !Sym->isInSection())
715 MCSymbol *MCStreamer::endSection(MCSection *Section) {
716 // TODO: keep track of the last subsection so that this symbol appears in the
718 MCSymbol *Sym = Section->getEndSymbol(Context);
719 if (Sym->isInSection())
722 SwitchSection(Section);