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/MCSectionCOFF.h"
23 #include "llvm/MC/MCSymbol.h"
24 #include "llvm/MC/MCWin64EH.h"
25 #include "llvm/Support/COFF.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/LEB128.h"
28 #include "llvm/Support/raw_ostream.h"
32 // Pin the vtables to this file.
33 MCTargetStreamer::~MCTargetStreamer() {}
35 MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
36 S.setTargetStreamer(this);
39 void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
41 void MCTargetStreamer::finish() {}
43 void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
45 MCStreamer::MCStreamer(MCContext &Ctx)
46 : Context(Ctx), CurrentWinFrameInfo(nullptr) {
47 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
50 MCStreamer::~MCStreamer() {
51 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
52 delete WinFrameInfos[i];
55 void MCStreamer::reset() {
56 DwarfFrameInfos.clear();
57 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
58 delete WinFrameInfos[i];
59 WinFrameInfos.clear();
60 CurrentWinFrameInfo = nullptr;
61 SymbolOrdering.clear();
63 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
66 raw_ostream &MCStreamer::GetCommentOS() {
67 // By default, discard comments.
71 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
73 void MCStreamer::addExplicitComment(const Twine &T) {}
74 void MCStreamer::emitExplicitComments() {}
76 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
77 for (auto &FI : DwarfFrameInfos)
78 FI.CompactUnwindEncoding =
79 (MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
82 /// EmitIntValue - Special case of EmitValue that avoids the client having to
83 /// pass in a MCExpr for constant integers.
84 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
85 assert(1 <= Size && Size <= 8 && "Invalid size");
86 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
89 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
90 for (unsigned i = 0; i != Size; ++i) {
91 unsigned index = isLittleEndian ? i : (Size - i - 1);
92 buf[i] = uint8_t(Value >> (index * 8));
94 EmitBytes(StringRef(buf, Size));
97 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
98 /// client having to pass in a MCExpr for constant integers.
99 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
100 SmallString<128> Tmp;
101 raw_svector_ostream OSE(Tmp);
102 encodeULEB128(Value, OSE, Padding);
103 EmitBytes(OSE.str());
106 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
107 /// client having to pass in a MCExpr for constant integers.
108 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
109 SmallString<128> Tmp;
110 raw_svector_ostream OSE(Tmp);
111 encodeSLEB128(Value, OSE);
112 EmitBytes(OSE.str());
115 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, SMLoc Loc) {
116 EmitValueImpl(Value, Size, Loc);
119 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
120 bool IsSectionRelative) {
121 assert((!IsSectionRelative || Size == 4) &&
122 "SectionRelative value requires 4-bytes");
124 if (!IsSectionRelative)
125 EmitValueImpl(MCSymbolRefExpr::create(Sym, getContext()), Size);
127 EmitCOFFSecRel32(Sym);
130 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
131 report_fatal_error("unsupported directive in streamer");
134 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
135 report_fatal_error("unsupported directive in streamer");
138 /// Emit NumBytes bytes worth of the value specified by FillValue.
139 /// This implements directives such as '.space'.
140 void MCStreamer::emitFill(uint64_t NumBytes, uint8_t FillValue) {
141 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
142 EmitIntValue(FillValue, 1);
145 void MCStreamer::emitFill(uint64_t NumValues, int64_t Size, int64_t Expr) {
146 int64_t NonZeroSize = Size > 4 ? 4 : Size;
147 Expr &= ~0ULL >> (64 - NonZeroSize * 8);
148 for (uint64_t i = 0, e = NumValues; i != e; ++i) {
149 EmitIntValue(Expr, NonZeroSize);
150 if (NonZeroSize < Size)
151 EmitIntValue(0, Size - NonZeroSize);
155 /// The implementation in this class just redirects to emitFill.
156 void MCStreamer::EmitZeros(uint64_t NumBytes) {
157 emitFill(NumBytes, 0);
160 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
162 StringRef Filename, unsigned CUID) {
163 return getContext().getDwarfFile(Directory, Filename, FileNo, CUID);
166 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
167 unsigned Column, unsigned Flags,
169 unsigned Discriminator,
170 StringRef FileName) {
171 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
175 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
176 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
177 if (!Table.getLabel()) {
178 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
180 Context.getOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
182 return Table.getLabel();
185 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
186 if (DwarfFrameInfos.empty())
188 return &DwarfFrameInfos.back();
191 bool MCStreamer::hasUnfinishedDwarfFrameInfo() {
192 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
193 return CurFrame && !CurFrame->End;
196 void MCStreamer::EnsureValidDwarfFrame() {
197 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
198 if (!CurFrame || CurFrame->End)
199 report_fatal_error("No open frame");
202 unsigned MCStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename) {
203 return getContext().getCVFile(Filename, FileNo);
206 void MCStreamer::EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
207 unsigned Line, unsigned Column,
208 bool PrologueEnd, bool IsStmt,
209 StringRef FileName) {
210 getContext().setCurrentCVLoc(FunctionId, FileNo, Line, Column, PrologueEnd,
214 void MCStreamer::EmitCVLinetableDirective(unsigned FunctionId,
215 const MCSymbol *Begin,
216 const MCSymbol *End) {}
218 void MCStreamer::EmitCVInlineLinetableDirective(
219 unsigned PrimaryFunctionId, unsigned SourceFileId, unsigned SourceLineNum,
220 const MCSymbol *FnStartSym, const MCSymbol *FnEndSym,
221 ArrayRef<unsigned> SecondaryFunctionIds) {}
223 void MCStreamer::EmitCVDefRangeDirective(
224 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
225 StringRef FixedSizePortion) {}
227 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
228 MCSymbol *EHSymbol) {
231 void MCStreamer::InitSections(bool NoExecStack) {
232 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
235 void MCStreamer::AssignFragment(MCSymbol *Symbol, MCFragment *Fragment) {
237 Symbol->setFragment(Fragment);
239 // As we emit symbols into a section, track the order so that they can
240 // be sorted upon later. Zero is reserved to mean 'unemitted'.
241 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
244 void MCStreamer::EmitLabel(MCSymbol *Symbol) {
245 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
246 assert(getCurrentSection().first && "Cannot emit before setting section!");
247 assert(!Symbol->getFragment() && "Unexpected fragment on symbol data!");
248 Symbol->setFragment(&getCurrentSectionOnly()->getDummyFragment());
250 MCTargetStreamer *TS = getTargetStreamer();
252 TS->emitLabel(Symbol);
255 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
259 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
260 if (hasUnfinishedDwarfFrameInfo())
261 report_fatal_error("Starting a frame before finishing the previous one!");
263 MCDwarfFrameInfo Frame;
264 Frame.IsSimple = IsSimple;
265 EmitCFIStartProcImpl(Frame);
267 const MCAsmInfo* MAI = Context.getAsmInfo();
269 for (const MCCFIInstruction& Inst : MAI->getInitialFrameState()) {
270 if (Inst.getOperation() == MCCFIInstruction::OpDefCfa ||
271 Inst.getOperation() == MCCFIInstruction::OpDefCfaRegister) {
272 Frame.CurrentCfaRegister = Inst.getRegister();
277 DwarfFrameInfos.push_back(Frame);
280 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
283 void MCStreamer::EmitCFIEndProc() {
284 EnsureValidDwarfFrame();
285 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
286 EmitCFIEndProcImpl(*CurFrame);
289 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
290 // Put a dummy non-null value in Frame.End to mark that this frame has been
292 Frame.End = (MCSymbol *) 1;
295 MCSymbol *MCStreamer::EmitCFICommon() {
296 EnsureValidDwarfFrame();
297 MCSymbol *Label = getContext().createTempSymbol();
302 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
303 MCSymbol *Label = EmitCFICommon();
304 MCCFIInstruction Instruction =
305 MCCFIInstruction::createDefCfa(Label, Register, Offset);
306 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
307 CurFrame->Instructions.push_back(Instruction);
308 CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
311 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
312 MCSymbol *Label = EmitCFICommon();
313 MCCFIInstruction Instruction =
314 MCCFIInstruction::createDefCfaOffset(Label, Offset);
315 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
316 CurFrame->Instructions.push_back(Instruction);
319 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
320 MCSymbol *Label = EmitCFICommon();
321 MCCFIInstruction Instruction =
322 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
323 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
324 CurFrame->Instructions.push_back(Instruction);
327 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
328 MCSymbol *Label = EmitCFICommon();
329 MCCFIInstruction Instruction =
330 MCCFIInstruction::createDefCfaRegister(Label, Register);
331 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
332 CurFrame->Instructions.push_back(Instruction);
333 CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
336 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
337 MCSymbol *Label = EmitCFICommon();
338 MCCFIInstruction Instruction =
339 MCCFIInstruction::createOffset(Label, Register, Offset);
340 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
341 CurFrame->Instructions.push_back(Instruction);
344 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
345 MCSymbol *Label = EmitCFICommon();
346 MCCFIInstruction Instruction =
347 MCCFIInstruction::createRelOffset(Label, Register, Offset);
348 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
349 CurFrame->Instructions.push_back(Instruction);
352 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
354 EnsureValidDwarfFrame();
355 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
356 CurFrame->Personality = Sym;
357 CurFrame->PersonalityEncoding = Encoding;
360 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
361 EnsureValidDwarfFrame();
362 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
363 CurFrame->Lsda = Sym;
364 CurFrame->LsdaEncoding = Encoding;
367 void MCStreamer::EmitCFIRememberState() {
368 MCSymbol *Label = EmitCFICommon();
369 MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
370 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
371 CurFrame->Instructions.push_back(Instruction);
374 void MCStreamer::EmitCFIRestoreState() {
375 // FIXME: Error if there is no matching cfi_remember_state.
376 MCSymbol *Label = EmitCFICommon();
377 MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
378 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
379 CurFrame->Instructions.push_back(Instruction);
382 void MCStreamer::EmitCFISameValue(int64_t Register) {
383 MCSymbol *Label = EmitCFICommon();
384 MCCFIInstruction Instruction =
385 MCCFIInstruction::createSameValue(Label, Register);
386 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
387 CurFrame->Instructions.push_back(Instruction);
390 void MCStreamer::EmitCFIRestore(int64_t Register) {
391 MCSymbol *Label = EmitCFICommon();
392 MCCFIInstruction Instruction =
393 MCCFIInstruction::createRestore(Label, Register);
394 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
395 CurFrame->Instructions.push_back(Instruction);
398 void MCStreamer::EmitCFIEscape(StringRef Values) {
399 MCSymbol *Label = EmitCFICommon();
400 MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
401 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
402 CurFrame->Instructions.push_back(Instruction);
405 void MCStreamer::EmitCFIGnuArgsSize(int64_t Size) {
406 MCSymbol *Label = EmitCFICommon();
407 MCCFIInstruction Instruction =
408 MCCFIInstruction::createGnuArgsSize(Label, Size);
409 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
410 CurFrame->Instructions.push_back(Instruction);
413 void MCStreamer::EmitCFISignalFrame() {
414 EnsureValidDwarfFrame();
415 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
416 CurFrame->IsSignalFrame = true;
419 void MCStreamer::EmitCFIUndefined(int64_t Register) {
420 MCSymbol *Label = EmitCFICommon();
421 MCCFIInstruction Instruction =
422 MCCFIInstruction::createUndefined(Label, Register);
423 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
424 CurFrame->Instructions.push_back(Instruction);
427 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
428 MCSymbol *Label = EmitCFICommon();
429 MCCFIInstruction Instruction =
430 MCCFIInstruction::createRegister(Label, Register1, Register2);
431 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
432 CurFrame->Instructions.push_back(Instruction);
435 void MCStreamer::EmitCFIWindowSave() {
436 MCSymbol *Label = EmitCFICommon();
437 MCCFIInstruction Instruction =
438 MCCFIInstruction::createWindowSave(Label);
439 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
440 CurFrame->Instructions.push_back(Instruction);
443 void MCStreamer::EnsureValidWinFrameInfo() {
444 const MCAsmInfo *MAI = Context.getAsmInfo();
445 if (!MAI->usesWindowsCFI())
446 report_fatal_error(".seh_* directives are not supported on this target");
447 if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
448 report_fatal_error("No open Win64 EH frame function!");
451 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
452 const MCAsmInfo *MAI = Context.getAsmInfo();
453 if (!MAI->usesWindowsCFI())
454 report_fatal_error(".seh_* directives are not supported on this target");
455 if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
456 report_fatal_error("Starting a function before ending the previous one!");
458 MCSymbol *StartProc = getContext().createTempSymbol();
459 EmitLabel(StartProc);
461 WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));
462 CurrentWinFrameInfo = WinFrameInfos.back();
463 CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
466 void MCStreamer::EmitWinCFIEndProc() {
467 EnsureValidWinFrameInfo();
468 if (CurrentWinFrameInfo->ChainedParent)
469 report_fatal_error("Not all chained regions terminated!");
471 MCSymbol *Label = getContext().createTempSymbol();
473 CurrentWinFrameInfo->End = Label;
476 void MCStreamer::EmitWinCFIStartChained() {
477 EnsureValidWinFrameInfo();
479 MCSymbol *StartProc = getContext().createTempSymbol();
480 EmitLabel(StartProc);
482 WinFrameInfos.push_back(new WinEH::FrameInfo(CurrentWinFrameInfo->Function,
483 StartProc, CurrentWinFrameInfo));
484 CurrentWinFrameInfo = WinFrameInfos.back();
485 CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
488 void MCStreamer::EmitWinCFIEndChained() {
489 EnsureValidWinFrameInfo();
490 if (!CurrentWinFrameInfo->ChainedParent)
491 report_fatal_error("End of a chained region outside a chained region!");
493 MCSymbol *Label = getContext().createTempSymbol();
496 CurrentWinFrameInfo->End = Label;
497 CurrentWinFrameInfo =
498 const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->ChainedParent);
501 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
503 EnsureValidWinFrameInfo();
504 if (CurrentWinFrameInfo->ChainedParent)
505 report_fatal_error("Chained unwind areas can't have handlers!");
506 CurrentWinFrameInfo->ExceptionHandler = Sym;
507 if (!Except && !Unwind)
508 report_fatal_error("Don't know what kind of handler this is!");
510 CurrentWinFrameInfo->HandlesUnwind = true;
512 CurrentWinFrameInfo->HandlesExceptions = true;
515 void MCStreamer::EmitWinEHHandlerData() {
516 EnsureValidWinFrameInfo();
517 if (CurrentWinFrameInfo->ChainedParent)
518 report_fatal_error("Chained unwind areas can't have handlers!");
521 static MCSection *getWinCFISection(MCContext &Context, unsigned *NextWinCFIID,
522 MCSection *MainCFISec,
523 const MCSection *TextSec) {
524 // If this is the main .text section, use the main unwind info section.
525 if (TextSec == Context.getObjectFileInfo()->getTextSection())
528 const auto *TextSecCOFF = cast<MCSectionCOFF>(TextSec);
529 unsigned UniqueID = TextSecCOFF->getOrAssignWinCFISectionID(NextWinCFIID);
531 // If this section is COMDAT, this unwind section should be COMDAT associative
533 const MCSymbol *KeySym = nullptr;
534 if (TextSecCOFF->getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT)
535 KeySym = TextSecCOFF->getCOMDATSymbol();
537 return Context.getAssociativeCOFFSection(cast<MCSectionCOFF>(MainCFISec),
541 MCSection *MCStreamer::getAssociatedPDataSection(const MCSection *TextSec) {
542 return getWinCFISection(getContext(), &NextWinCFIID,
543 getContext().getObjectFileInfo()->getPDataSection(),
547 MCSection *MCStreamer::getAssociatedXDataSection(const MCSection *TextSec) {
548 return getWinCFISection(getContext(), &NextWinCFIID,
549 getContext().getObjectFileInfo()->getXDataSection(),
553 void MCStreamer::EmitSyntaxDirective() {}
555 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
556 EnsureValidWinFrameInfo();
558 MCSymbol *Label = getContext().createTempSymbol();
561 WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
562 CurrentWinFrameInfo->Instructions.push_back(Inst);
565 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
566 EnsureValidWinFrameInfo();
567 if (CurrentWinFrameInfo->LastFrameInst >= 0)
568 report_fatal_error("Frame register and offset already specified!");
570 report_fatal_error("Misaligned frame pointer offset!");
572 report_fatal_error("Frame offset must be less than or equal to 240!");
574 MCSymbol *Label = getContext().createTempSymbol();
577 WinEH::Instruction Inst =
578 Win64EH::Instruction::SetFPReg(Label, Register, Offset);
579 CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
580 CurrentWinFrameInfo->Instructions.push_back(Inst);
583 void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
584 EnsureValidWinFrameInfo();
586 report_fatal_error("Allocation size must be non-zero!");
588 report_fatal_error("Misaligned stack allocation!");
590 MCSymbol *Label = getContext().createTempSymbol();
593 WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
594 CurrentWinFrameInfo->Instructions.push_back(Inst);
597 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
598 EnsureValidWinFrameInfo();
600 report_fatal_error("Misaligned saved register offset!");
602 MCSymbol *Label = getContext().createTempSymbol();
605 WinEH::Instruction Inst =
606 Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
607 CurrentWinFrameInfo->Instructions.push_back(Inst);
610 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
611 EnsureValidWinFrameInfo();
613 report_fatal_error("Misaligned saved vector register offset!");
615 MCSymbol *Label = getContext().createTempSymbol();
618 WinEH::Instruction Inst =
619 Win64EH::Instruction::SaveXMM(Label, Register, Offset);
620 CurrentWinFrameInfo->Instructions.push_back(Inst);
623 void MCStreamer::EmitWinCFIPushFrame(bool Code) {
624 EnsureValidWinFrameInfo();
625 if (CurrentWinFrameInfo->Instructions.size() > 0)
626 report_fatal_error("If present, PushMachFrame must be the first UOP");
628 MCSymbol *Label = getContext().createTempSymbol();
631 WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
632 CurrentWinFrameInfo->Instructions.push_back(Inst);
635 void MCStreamer::EmitWinCFIEndProlog() {
636 EnsureValidWinFrameInfo();
638 MCSymbol *Label = getContext().createTempSymbol();
641 CurrentWinFrameInfo->PrologEnd = Label;
644 void MCStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
647 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
650 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
653 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
654 /// the specified string in the output .s file. This capability is
655 /// indicated by the hasRawTextSupport() predicate.
656 void MCStreamer::EmitRawTextImpl(StringRef String) {
657 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
658 " something must not be fully mc'ized\n";
662 void MCStreamer::EmitRawText(const Twine &T) {
663 SmallString<128> Str;
664 EmitRawTextImpl(T.toStringRef(Str));
667 void MCStreamer::EmitWindowsUnwindTables() {
670 void MCStreamer::Finish() {
671 if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
672 report_fatal_error("Unfinished frame!");
674 MCTargetStreamer *TS = getTargetStreamer();
681 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
682 visitUsedExpr(*Value);
683 Symbol->setVariableValue(Value);
685 MCTargetStreamer *TS = getTargetStreamer();
687 TS->emitAssignment(Symbol, Value);
690 void MCTargetStreamer::prettyPrintAsm(MCInstPrinter &InstPrinter, raw_ostream &OS,
691 const MCInst &Inst, const MCSubtargetInfo &STI) {
692 InstPrinter.printInst(&Inst, OS, "", STI);
695 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
698 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
699 switch (Expr.getKind()) {
701 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
704 case MCExpr::Constant:
707 case MCExpr::Binary: {
708 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
709 visitUsedExpr(*BE.getLHS());
710 visitUsedExpr(*BE.getRHS());
714 case MCExpr::SymbolRef:
715 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
719 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
724 void MCStreamer::EmitInstruction(const MCInst &Inst,
725 const MCSubtargetInfo &STI) {
727 for (unsigned i = Inst.getNumOperands(); i--;)
728 if (Inst.getOperand(i).isExpr())
729 visitUsedExpr(*Inst.getOperand(i).getExpr());
732 void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
734 // Get the Hi-Lo expression.
736 MCBinaryExpr::createSub(MCSymbolRefExpr::create(Hi, Context),
737 MCSymbolRefExpr::create(Lo, Context), Context);
739 const MCAsmInfo *MAI = Context.getAsmInfo();
740 if (!MAI->doesSetDirectiveSuppressReloc()) {
741 EmitValue(Diff, Size);
745 // Otherwise, emit with .set (aka assignment).
746 MCSymbol *SetLabel = Context.createTempSymbol("set", true);
747 EmitAssignment(SetLabel, Diff);
748 EmitSymbolValue(SetLabel, Size);
751 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
752 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
753 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
754 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
755 void MCStreamer::EndCOFFSymbolDef() {}
756 void MCStreamer::EmitFileDirective(StringRef Filename) {}
757 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
758 void MCStreamer::EmitCOFFSymbolType(int Type) {}
759 void MCStreamer::emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) {}
760 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
761 unsigned ByteAlignment) {}
762 void MCStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
763 uint64_t Size, unsigned ByteAlignment) {}
764 void MCStreamer::ChangeSection(MCSection *, const MCExpr *) {}
765 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
766 void MCStreamer::EmitBytes(StringRef Data) {}
767 void MCStreamer::EmitBinaryData(StringRef Data) { EmitBytes(Data); }
768 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) {
769 visitUsedExpr(*Value);
771 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
772 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
773 void MCStreamer::emitFill(const MCExpr &NumBytes, uint64_t Value, SMLoc Loc) {}
774 void MCStreamer::emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
776 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
778 unsigned MaxBytesToEmit) {}
779 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
780 unsigned MaxBytesToEmit) {}
781 void MCStreamer::emitValueToOffset(const MCExpr *Offset, unsigned char Value) {}
782 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
783 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
784 void MCStreamer::FinishImpl() {}
785 void MCStreamer::EmitBundleUnlock() {}
787 void MCStreamer::SwitchSection(MCSection *Section, const MCExpr *Subsection) {
788 assert(Section && "Cannot switch to a null section!");
789 MCSectionSubPair curSection = SectionStack.back().first;
790 SectionStack.back().second = curSection;
791 if (MCSectionSubPair(Section, Subsection) != curSection) {
792 ChangeSection(Section, Subsection);
793 SectionStack.back().first = MCSectionSubPair(Section, Subsection);
794 assert(!Section->hasEnded() && "Section already ended");
795 MCSymbol *Sym = Section->getBeginSymbol();
796 if (Sym && !Sym->isInSection())
801 MCSymbol *MCStreamer::endSection(MCSection *Section) {
802 // TODO: keep track of the last subsection so that this symbol appears in the
804 MCSymbol *Sym = Section->getEndSymbol(Context);
805 if (Sym->isInSection())
808 SwitchSection(Section);