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 const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) {
73 assert(!isa<MCSymbolRefExpr>(Expr));
74 if (Context.getAsmInfo()->hasAggressiveSymbolFolding())
77 MCSymbol *ABS = Context.CreateTempSymbol();
78 EmitAssignment(ABS, Expr);
79 return MCSymbolRefExpr::Create(ABS, Context);
82 raw_ostream &MCStreamer::GetCommentOS() {
83 // By default, discard comments.
87 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
89 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
90 for (auto &FI : DwarfFrameInfos)
91 FI.CompactUnwindEncoding =
92 (MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
95 void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta,
96 const MCSymbol *Label, int PointerSize) {
97 // emit the sequence to set the address
98 EmitIntValue(dwarf::DW_LNS_extended_op, 1);
99 EmitULEB128IntValue(PointerSize + 1);
100 EmitIntValue(dwarf::DW_LNE_set_address, 1);
101 EmitSymbolValue(Label, PointerSize);
103 // emit the sequence for the LineDelta (from 1) and a zero address delta.
104 MCDwarfLineAddr::Emit(this, LineDelta, 0);
107 /// EmitIntValue - Special case of EmitValue that avoids the client having to
108 /// pass in a MCExpr for constant integers.
109 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
110 assert(Size <= 8 && "Invalid size");
111 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
114 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
115 for (unsigned i = 0; i != Size; ++i) {
116 unsigned index = isLittleEndian ? i : (Size - i - 1);
117 buf[i] = uint8_t(Value >> (index * 8));
119 EmitBytes(StringRef(buf, Size));
122 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
123 /// client having to pass in a MCExpr for constant integers.
124 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
125 SmallString<128> Tmp;
126 raw_svector_ostream OSE(Tmp);
127 encodeULEB128(Value, OSE, Padding);
128 EmitBytes(OSE.str());
131 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
132 /// client having to pass in a MCExpr for constant integers.
133 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
134 SmallString<128> Tmp;
135 raw_svector_ostream OSE(Tmp);
136 encodeSLEB128(Value, OSE);
137 EmitBytes(OSE.str());
140 void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
141 const MCExpr *ABS = ForceExpAbs(Value);
142 EmitValue(ABS, Size);
146 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size,
148 EmitValueImpl(Value, Size, Loc);
151 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
152 bool IsSectionRelative) {
153 assert((!IsSectionRelative || Size == 4) &&
154 "SectionRelative value requires 4-bytes");
156 if (!IsSectionRelative)
157 EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size);
159 EmitCOFFSecRel32(Sym);
162 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
163 report_fatal_error("unsupported directive in streamer");
166 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
167 report_fatal_error("unsupported directive in streamer");
170 /// EmitFill - Emit NumBytes bytes worth of the value specified by
171 /// FillValue. This implements directives such as '.space'.
172 void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
173 const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
174 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
178 /// The implementation in this class just redirects to EmitFill.
179 void MCStreamer::EmitZeros(uint64_t NumBytes) {
180 EmitFill(NumBytes, 0);
183 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
185 StringRef Filename, unsigned CUID) {
186 return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID);
189 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
190 unsigned Column, unsigned Flags,
192 unsigned Discriminator,
193 StringRef FileName) {
194 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
198 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
199 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
200 if (!Table.getLabel()) {
201 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
203 Context.GetOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
205 return Table.getLabel();
208 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
209 if (DwarfFrameInfos.empty())
211 return &DwarfFrameInfos.back();
214 void MCStreamer::EnsureValidDwarfFrame() {
215 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
216 if (!CurFrame || CurFrame->End)
217 report_fatal_error("No open frame");
220 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
221 MCSymbol *EHSymbol) {
224 void MCStreamer::InitSections() {
225 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
228 void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) {
230 Symbol->setSection(*Section);
232 Symbol->setUndefined();
234 // As we emit symbols into a section, track the order so that they can
235 // be sorted upon later. Zero is reserved to mean 'unemitted'.
236 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
239 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
240 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
241 assert(getCurrentSection().first && "Cannot emit before setting section!");
242 AssignSection(Symbol, getCurrentSection().first);
244 MCTargetStreamer *TS = getTargetStreamer();
246 TS->emitLabel(Symbol);
249 void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
250 EnsureValidDwarfFrame();
251 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
252 CurFrame->CompactUnwindEncoding = CompactUnwindEncoding;
255 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
259 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
260 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
261 if (CurFrame && !CurFrame->End)
262 report_fatal_error("Starting a frame before finishing the previous one!");
264 MCDwarfFrameInfo Frame;
265 Frame.IsSimple = IsSimple;
266 EmitCFIStartProcImpl(Frame);
268 DwarfFrameInfos.push_back(Frame);
271 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
274 void MCStreamer::EmitCFIEndProc() {
275 EnsureValidDwarfFrame();
276 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
277 EmitCFIEndProcImpl(*CurFrame);
280 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
281 // Put a dummy non-null value in Frame.End to mark that this frame has been
283 Frame.End = (MCSymbol *) 1;
286 MCSymbol *MCStreamer::EmitCFICommon() {
287 EnsureValidDwarfFrame();
288 MCSymbol *Label = getContext().CreateTempSymbol();
293 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
294 MCSymbol *Label = EmitCFICommon();
295 MCCFIInstruction Instruction =
296 MCCFIInstruction::createDefCfa(Label, Register, Offset);
297 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
298 CurFrame->Instructions.push_back(Instruction);
301 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
302 MCSymbol *Label = EmitCFICommon();
303 MCCFIInstruction Instruction =
304 MCCFIInstruction::createDefCfaOffset(Label, Offset);
305 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
306 CurFrame->Instructions.push_back(Instruction);
309 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
310 MCSymbol *Label = EmitCFICommon();
311 MCCFIInstruction Instruction =
312 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
313 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
314 CurFrame->Instructions.push_back(Instruction);
317 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
318 MCSymbol *Label = EmitCFICommon();
319 MCCFIInstruction Instruction =
320 MCCFIInstruction::createDefCfaRegister(Label, Register);
321 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
322 CurFrame->Instructions.push_back(Instruction);
325 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
326 MCSymbol *Label = EmitCFICommon();
327 MCCFIInstruction Instruction =
328 MCCFIInstruction::createOffset(Label, Register, Offset);
329 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
330 CurFrame->Instructions.push_back(Instruction);
333 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
334 MCSymbol *Label = EmitCFICommon();
335 MCCFIInstruction Instruction =
336 MCCFIInstruction::createRelOffset(Label, Register, Offset);
337 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
338 CurFrame->Instructions.push_back(Instruction);
341 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
343 EnsureValidDwarfFrame();
344 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
345 CurFrame->Personality = Sym;
346 CurFrame->PersonalityEncoding = Encoding;
349 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
350 EnsureValidDwarfFrame();
351 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
352 CurFrame->Lsda = Sym;
353 CurFrame->LsdaEncoding = Encoding;
356 void MCStreamer::EmitCFIRememberState() {
357 MCSymbol *Label = EmitCFICommon();
358 MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
359 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
360 CurFrame->Instructions.push_back(Instruction);
363 void MCStreamer::EmitCFIRestoreState() {
364 // FIXME: Error if there is no matching cfi_remember_state.
365 MCSymbol *Label = EmitCFICommon();
366 MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
367 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
368 CurFrame->Instructions.push_back(Instruction);
371 void MCStreamer::EmitCFISameValue(int64_t Register) {
372 MCSymbol *Label = EmitCFICommon();
373 MCCFIInstruction Instruction =
374 MCCFIInstruction::createSameValue(Label, Register);
375 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
376 CurFrame->Instructions.push_back(Instruction);
379 void MCStreamer::EmitCFIRestore(int64_t Register) {
380 MCSymbol *Label = EmitCFICommon();
381 MCCFIInstruction Instruction =
382 MCCFIInstruction::createRestore(Label, Register);
383 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
384 CurFrame->Instructions.push_back(Instruction);
387 void MCStreamer::EmitCFIEscape(StringRef Values) {
388 MCSymbol *Label = EmitCFICommon();
389 MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
390 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
391 CurFrame->Instructions.push_back(Instruction);
394 void MCStreamer::EmitCFISignalFrame() {
395 EnsureValidDwarfFrame();
396 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
397 CurFrame->IsSignalFrame = true;
400 void MCStreamer::EmitCFIUndefined(int64_t Register) {
401 MCSymbol *Label = EmitCFICommon();
402 MCCFIInstruction Instruction =
403 MCCFIInstruction::createUndefined(Label, Register);
404 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
405 CurFrame->Instructions.push_back(Instruction);
408 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
409 MCSymbol *Label = EmitCFICommon();
410 MCCFIInstruction Instruction =
411 MCCFIInstruction::createRegister(Label, Register1, Register2);
412 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
413 CurFrame->Instructions.push_back(Instruction);
416 void MCStreamer::EmitCFIWindowSave() {
417 MCSymbol *Label = EmitCFICommon();
418 MCCFIInstruction Instruction =
419 MCCFIInstruction::createWindowSave(Label);
420 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
421 CurFrame->Instructions.push_back(Instruction);
424 void MCStreamer::EnsureValidWinFrameInfo() {
425 if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
426 report_fatal_error("No open Win64 EH frame function!");
429 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
430 if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
431 report_fatal_error("Starting a function before ending the previous one!");
432 MCWinFrameInfo *Frame = new MCWinFrameInfo;
433 Frame->Begin = getContext().CreateTempSymbol();
434 Frame->Function = Symbol;
435 EmitLabel(Frame->Begin);
436 WinFrameInfos.push_back(Frame);
437 CurrentWinFrameInfo = WinFrameInfos.back();
440 void MCStreamer::EmitWinCFIEndProc() {
441 EnsureValidWinFrameInfo();
442 if (CurrentWinFrameInfo->ChainedParent)
443 report_fatal_error("Not all chained regions terminated!");
444 CurrentWinFrameInfo->End = getContext().CreateTempSymbol();
445 EmitLabel(CurrentWinFrameInfo->End);
448 void MCStreamer::EmitWinCFIStartChained() {
449 EnsureValidWinFrameInfo();
450 MCWinFrameInfo *Frame = new MCWinFrameInfo;
451 Frame->Begin = getContext().CreateTempSymbol();
452 Frame->Function = CurrentWinFrameInfo->Function;
453 Frame->ChainedParent = CurrentWinFrameInfo;
454 EmitLabel(Frame->Begin);
455 WinFrameInfos.push_back(Frame);
456 CurrentWinFrameInfo = WinFrameInfos.back();
459 void MCStreamer::EmitWinCFIEndChained() {
460 EnsureValidWinFrameInfo();
461 if (!CurrentWinFrameInfo->ChainedParent)
462 report_fatal_error("End of a chained region outside a chained region!");
463 CurrentWinFrameInfo->End = getContext().CreateTempSymbol();
464 EmitLabel(CurrentWinFrameInfo->End);
465 CurrentWinFrameInfo = CurrentWinFrameInfo->ChainedParent;
468 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
470 EnsureValidWinFrameInfo();
471 if (CurrentWinFrameInfo->ChainedParent)
472 report_fatal_error("Chained unwind areas can't have handlers!");
473 CurrentWinFrameInfo->ExceptionHandler = Sym;
474 if (!Except && !Unwind)
475 report_fatal_error("Don't know what kind of handler this is!");
477 CurrentWinFrameInfo->HandlesUnwind = true;
479 CurrentWinFrameInfo->HandlesExceptions = true;
482 void MCStreamer::EmitWinEHHandlerData() {
483 EnsureValidWinFrameInfo();
484 if (CurrentWinFrameInfo->ChainedParent)
485 report_fatal_error("Chained unwind areas can't have handlers!");
488 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
489 EnsureValidWinFrameInfo();
491 MCSymbol *Label = getContext().CreateTempSymbol();
494 WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
495 CurrentWinFrameInfo->Instructions.push_back(Inst);
498 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
499 EnsureValidWinFrameInfo();
500 if (CurrentWinFrameInfo->LastFrameInst >= 0)
501 report_fatal_error("Frame register and offset already specified!");
503 report_fatal_error("Misaligned frame pointer offset!");
505 report_fatal_error("Frame offset must be less than or equal to 240!");
507 MCSymbol *Label = getContext().CreateTempSymbol();
510 WinEH::Instruction Inst =
511 Win64EH::Instruction::SetFPReg(Label, Register, Offset);
512 CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
513 CurrentWinFrameInfo->Instructions.push_back(Inst);
516 void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
517 EnsureValidWinFrameInfo();
519 report_fatal_error("Allocation size must be non-zero!");
521 report_fatal_error("Misaligned stack allocation!");
523 MCSymbol *Label = getContext().CreateTempSymbol();
526 WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
527 CurrentWinFrameInfo->Instructions.push_back(Inst);
530 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
531 EnsureValidWinFrameInfo();
533 report_fatal_error("Misaligned saved register offset!");
535 MCSymbol *Label = getContext().CreateTempSymbol();
538 WinEH::Instruction Inst =
539 Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
540 CurrentWinFrameInfo->Instructions.push_back(Inst);
543 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
544 EnsureValidWinFrameInfo();
546 report_fatal_error("Misaligned saved vector register offset!");
548 MCSymbol *Label = getContext().CreateTempSymbol();
551 WinEH::Instruction Inst =
552 Win64EH::Instruction::SaveXMM(Label, Register, Offset);
553 CurrentWinFrameInfo->Instructions.push_back(Inst);
556 void MCStreamer::EmitWinCFIPushFrame(bool Code) {
557 EnsureValidWinFrameInfo();
558 if (CurrentWinFrameInfo->Instructions.size() > 0)
559 report_fatal_error("If present, PushMachFrame must be the first UOP");
561 MCSymbol *Label = getContext().CreateTempSymbol();
564 WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
565 CurrentWinFrameInfo->Instructions.push_back(Inst);
568 void MCStreamer::EmitWinCFIEndProlog() {
569 EnsureValidWinFrameInfo();
570 CurrentWinFrameInfo->PrologEnd = getContext().CreateTempSymbol();
571 EmitLabel(CurrentWinFrameInfo->PrologEnd);
574 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
577 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
580 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
581 /// the specified string in the output .s file. This capability is
582 /// indicated by the hasRawTextSupport() predicate.
583 void MCStreamer::EmitRawTextImpl(StringRef String) {
584 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
585 " something must not be fully mc'ized\n";
589 void MCStreamer::EmitRawText(const Twine &T) {
590 SmallString<128> Str;
591 EmitRawTextImpl(T.toStringRef(Str));
594 void MCStreamer::EmitWindowsUnwindTables() {
595 if (!getNumWinFrameInfos())
598 MCWin64EHUnwindEmitter::Emit(*this);
601 void MCStreamer::Finish() {
602 if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
603 report_fatal_error("Unfinished frame!");
605 MCTargetStreamer *TS = getTargetStreamer();
612 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
613 visitUsedExpr(*Value);
614 Symbol->setVariableValue(Value);
616 MCTargetStreamer *TS = getTargetStreamer();
618 TS->emitAssignment(Symbol, Value);
621 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
624 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
625 switch (Expr.getKind()) {
627 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
630 case MCExpr::Constant:
633 case MCExpr::Binary: {
634 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
635 visitUsedExpr(*BE.getLHS());
636 visitUsedExpr(*BE.getRHS());
640 case MCExpr::SymbolRef:
641 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
645 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
650 void MCStreamer::EmitInstruction(const MCInst &Inst,
651 const MCSubtargetInfo &STI) {
653 for (unsigned i = Inst.getNumOperands(); i--;)
654 if (Inst.getOperand(i).isExpr())
655 visitUsedExpr(*Inst.getOperand(i).getExpr());
658 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
659 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
660 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
661 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
662 void MCStreamer::EndCOFFSymbolDef() {}
663 void MCStreamer::EmitFileDirective(StringRef Filename) {}
664 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
665 void MCStreamer::EmitCOFFSymbolType(int Type) {}
666 void MCStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
667 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
668 unsigned ByteAlignment) {}
669 void MCStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
670 uint64_t Size, unsigned ByteAlignment) {}
671 void MCStreamer::ChangeSection(const MCSection *, const MCExpr *) {}
672 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
673 void MCStreamer::EmitBytes(StringRef Data) {}
674 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
676 visitUsedExpr(*Value);
678 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
679 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
680 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
682 unsigned MaxBytesToEmit) {}
683 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
684 unsigned MaxBytesToEmit) {}
685 bool MCStreamer::EmitValueToOffset(const MCExpr *Offset, unsigned char Value) {
688 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
689 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
690 void MCStreamer::FinishImpl() {}
691 void MCStreamer::EmitBundleUnlock() {}