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/StringRef.h"
13 #include "llvm/ADT/Twine.h"
14 #include "llvm/BinaryFormat/COFF.h"
15 #include "llvm/MC/MCAsmBackend.h"
16 #include "llvm/MC/MCAsmInfo.h"
17 #include "llvm/MC/MCCodeView.h"
18 #include "llvm/MC/MCContext.h"
19 #include "llvm/MC/MCDwarf.h"
20 #include "llvm/MC/MCExpr.h"
21 #include "llvm/MC/MCInst.h"
22 #include "llvm/MC/MCInstPrinter.h"
23 #include "llvm/MC/MCObjectFileInfo.h"
24 #include "llvm/MC/MCSection.h"
25 #include "llvm/MC/MCSectionCOFF.h"
26 #include "llvm/MC/MCSymbol.h"
27 #include "llvm/MC/MCWin64EH.h"
28 #include "llvm/MC/MCWinEH.h"
29 #include "llvm/Support/Casting.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/LEB128.h"
32 #include "llvm/Support/MathExtras.h"
33 #include "llvm/Support/raw_ostream.h"
41 MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
42 S.setTargetStreamer(this);
45 // Pin the vtables to this file.
46 MCTargetStreamer::~MCTargetStreamer() = default;
48 void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
50 void MCTargetStreamer::finish() {}
52 void MCTargetStreamer::changeSection(const MCSection *CurSection,
54 const MCExpr *Subsection,
56 Section->PrintSwitchToSection(
57 *Streamer.getContext().getAsmInfo(),
58 Streamer.getContext().getObjectFileInfo()->getTargetTriple(), OS,
62 void MCTargetStreamer::emitDwarfFileDirective(StringRef Directive) {
63 Streamer.EmitRawText(Directive);
66 void MCTargetStreamer::emitValue(const MCExpr *Value) {
68 raw_svector_ostream OS(Str);
70 Value->print(OS, Streamer.getContext().getAsmInfo());
71 Streamer.EmitRawText(OS.str());
74 void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
76 MCStreamer::MCStreamer(MCContext &Ctx)
77 : Context(Ctx), CurrentWinFrameInfo(nullptr) {
78 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
81 MCStreamer::~MCStreamer() {}
83 void MCStreamer::reset() {
84 DwarfFrameInfos.clear();
85 CurrentWinFrameInfo = nullptr;
86 WinFrameInfos.clear();
87 SymbolOrdering.clear();
89 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
92 raw_ostream &MCStreamer::GetCommentOS() {
93 // By default, discard comments.
97 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
99 void MCStreamer::addExplicitComment(const Twine &T) {}
100 void MCStreamer::emitExplicitComments() {}
102 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
103 for (auto &FI : DwarfFrameInfos)
104 FI.CompactUnwindEncoding =
105 (MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
108 /// EmitIntValue - Special case of EmitValue that avoids the client having to
109 /// pass in a MCExpr for constant integers.
110 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
111 assert(1 <= Size && Size <= 8 && "Invalid size");
112 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
115 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
116 for (unsigned i = 0; i != Size; ++i) {
117 unsigned index = isLittleEndian ? i : (Size - i - 1);
118 buf[i] = uint8_t(Value >> (index * 8));
120 EmitBytes(StringRef(buf, Size));
123 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
124 /// client having to pass in a MCExpr for constant integers.
125 void MCStreamer::EmitPaddedULEB128IntValue(uint64_t Value, unsigned PadTo) {
126 SmallString<128> Tmp;
127 raw_svector_ostream OSE(Tmp);
128 encodeULEB128(Value, OSE, PadTo);
129 EmitBytes(OSE.str());
132 void MCStreamer::EmitULEB128IntValue(uint64_t Value) {
133 EmitPaddedULEB128IntValue(Value, 0);
136 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
137 /// client having to pass in a MCExpr for constant integers.
138 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
139 SmallString<128> Tmp;
140 raw_svector_ostream OSE(Tmp);
141 encodeSLEB128(Value, OSE);
142 EmitBytes(OSE.str());
145 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, SMLoc Loc) {
146 EmitValueImpl(Value, Size, Loc);
149 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
150 bool IsSectionRelative) {
151 assert((!IsSectionRelative || Size == 4) &&
152 "SectionRelative value requires 4-bytes");
154 if (!IsSectionRelative)
155 EmitValueImpl(MCSymbolRefExpr::create(Sym, getContext()), Size);
157 EmitCOFFSecRel32(Sym, /*Offset=*/0);
160 void MCStreamer::EmitDTPRel64Value(const MCExpr *Value) {
161 report_fatal_error("unsupported directive in streamer");
164 void MCStreamer::EmitDTPRel32Value(const MCExpr *Value) {
165 report_fatal_error("unsupported directive in streamer");
168 void MCStreamer::EmitTPRel64Value(const MCExpr *Value) {
169 report_fatal_error("unsupported directive in streamer");
172 void MCStreamer::EmitTPRel32Value(const MCExpr *Value) {
173 report_fatal_error("unsupported directive in streamer");
176 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
177 report_fatal_error("unsupported directive in streamer");
180 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
181 report_fatal_error("unsupported directive in streamer");
184 /// Emit NumBytes bytes worth of the value specified by FillValue.
185 /// This implements directives such as '.space'.
186 void MCStreamer::emitFill(uint64_t NumBytes, uint8_t FillValue) {
187 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
188 EmitIntValue(FillValue, 1);
191 void MCStreamer::emitFill(uint64_t NumValues, int64_t Size, int64_t Expr) {
192 int64_t NonZeroSize = Size > 4 ? 4 : Size;
193 Expr &= ~0ULL >> (64 - NonZeroSize * 8);
194 for (uint64_t i = 0, e = NumValues; i != e; ++i) {
195 EmitIntValue(Expr, NonZeroSize);
196 if (NonZeroSize < Size)
197 EmitIntValue(0, Size - NonZeroSize);
201 /// The implementation in this class just redirects to emitFill.
202 void MCStreamer::EmitZeros(uint64_t NumBytes) {
203 emitFill(NumBytes, 0);
206 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
208 StringRef Filename, unsigned CUID) {
209 return getContext().getDwarfFile(Directory, Filename, FileNo, CUID);
212 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
213 unsigned Column, unsigned Flags,
215 unsigned Discriminator,
216 StringRef FileName) {
217 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
221 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
222 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
223 if (!Table.getLabel()) {
224 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
226 Context.getOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
228 return Table.getLabel();
231 bool MCStreamer::hasUnfinishedDwarfFrameInfo() {
232 return !DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End;
235 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
236 if (!hasUnfinishedDwarfFrameInfo()) {
237 getContext().reportError(SMLoc(), "this directive must appear between "
238 ".cfi_startproc and .cfi_endproc "
242 return &DwarfFrameInfos.back();
245 bool MCStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename,
246 ArrayRef<uint8_t> Checksum,
247 unsigned ChecksumKind) {
248 return getContext().getCVContext().addFile(*this, FileNo, Filename, Checksum,
252 bool MCStreamer::EmitCVFuncIdDirective(unsigned FunctionId) {
253 return getContext().getCVContext().recordFunctionId(FunctionId);
256 bool MCStreamer::EmitCVInlineSiteIdDirective(unsigned FunctionId,
257 unsigned IAFunc, unsigned IAFile,
258 unsigned IALine, unsigned IACol,
260 if (getContext().getCVContext().getCVFunctionInfo(IAFunc) == nullptr) {
261 getContext().reportError(Loc, "parent function id not introduced by "
262 ".cv_func_id or .cv_inline_site_id");
266 return getContext().getCVContext().recordInlinedCallSiteId(
267 FunctionId, IAFunc, IAFile, IALine, IACol);
270 void MCStreamer::EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
271 unsigned Line, unsigned Column,
272 bool PrologueEnd, bool IsStmt,
273 StringRef FileName, SMLoc Loc) {
274 CodeViewContext &CVC = getContext().getCVContext();
275 MCCVFunctionInfo *FI = CVC.getCVFunctionInfo(FunctionId);
277 return getContext().reportError(
278 Loc, "function id not introduced by .cv_func_id or .cv_inline_site_id");
281 if (FI->Section == nullptr)
282 FI->Section = getCurrentSectionOnly();
283 else if (FI->Section != getCurrentSectionOnly())
284 return getContext().reportError(
286 "all .cv_loc directives for a function must be in the same section");
288 CVC.setCurrentCVLoc(FunctionId, FileNo, Line, Column, PrologueEnd, IsStmt);
291 void MCStreamer::EmitCVLinetableDirective(unsigned FunctionId,
292 const MCSymbol *Begin,
293 const MCSymbol *End) {}
295 void MCStreamer::EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
296 unsigned SourceFileId,
297 unsigned SourceLineNum,
298 const MCSymbol *FnStartSym,
299 const MCSymbol *FnEndSym) {}
301 void MCStreamer::EmitCVDefRangeDirective(
302 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
303 StringRef FixedSizePortion) {}
305 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
306 MCSymbol *EHSymbol) {
309 void MCStreamer::InitSections(bool NoExecStack) {
310 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
313 void MCStreamer::AssignFragment(MCSymbol *Symbol, MCFragment *Fragment) {
315 Symbol->setFragment(Fragment);
317 // As we emit symbols into a section, track the order so that they can
318 // be sorted upon later. Zero is reserved to mean 'unemitted'.
319 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
322 void MCStreamer::EmitLabel(MCSymbol *Symbol, SMLoc Loc) {
323 Symbol->redefineIfPossible();
325 if (!Symbol->isUndefined() || Symbol->isVariable())
326 return getContext().reportError(Loc, "invalid symbol redefinition");
328 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
329 assert(getCurrentSectionOnly() && "Cannot emit before setting section!");
330 assert(!Symbol->getFragment() && "Unexpected fragment on symbol data!");
331 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
333 Symbol->setFragment(&getCurrentSectionOnly()->getDummyFragment());
335 MCTargetStreamer *TS = getTargetStreamer();
337 TS->emitLabel(Symbol);
340 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
344 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
345 if (hasUnfinishedDwarfFrameInfo())
346 getContext().reportError(
347 SMLoc(), "starting new .cfi frame before finishing the previous one");
349 MCDwarfFrameInfo Frame;
350 Frame.IsSimple = IsSimple;
351 EmitCFIStartProcImpl(Frame);
353 const MCAsmInfo* MAI = Context.getAsmInfo();
355 for (const MCCFIInstruction& Inst : MAI->getInitialFrameState()) {
356 if (Inst.getOperation() == MCCFIInstruction::OpDefCfa ||
357 Inst.getOperation() == MCCFIInstruction::OpDefCfaRegister) {
358 Frame.CurrentCfaRegister = Inst.getRegister();
363 DwarfFrameInfos.push_back(Frame);
366 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
369 void MCStreamer::EmitCFIEndProc() {
370 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
373 EmitCFIEndProcImpl(*CurFrame);
376 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
377 // Put a dummy non-null value in Frame.End to mark that this frame has been
379 Frame.End = (MCSymbol *)1;
382 MCSymbol *MCStreamer::EmitCFILabel() {
383 // Return a dummy non-null value so that label fields appear filled in when
384 // generating textual assembly.
385 return (MCSymbol *)1;
388 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
389 MCSymbol *Label = EmitCFILabel();
390 MCCFIInstruction Instruction =
391 MCCFIInstruction::createDefCfa(Label, Register, Offset);
392 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
395 CurFrame->Instructions.push_back(Instruction);
396 CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
399 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
400 MCSymbol *Label = EmitCFILabel();
401 MCCFIInstruction Instruction =
402 MCCFIInstruction::createDefCfaOffset(Label, Offset);
403 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
406 CurFrame->Instructions.push_back(Instruction);
409 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
410 MCSymbol *Label = EmitCFILabel();
411 MCCFIInstruction Instruction =
412 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
413 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
416 CurFrame->Instructions.push_back(Instruction);
419 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
420 MCSymbol *Label = EmitCFILabel();
421 MCCFIInstruction Instruction =
422 MCCFIInstruction::createDefCfaRegister(Label, Register);
423 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
426 CurFrame->Instructions.push_back(Instruction);
427 CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
430 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
431 MCSymbol *Label = EmitCFILabel();
432 MCCFIInstruction Instruction =
433 MCCFIInstruction::createOffset(Label, Register, Offset);
434 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
437 CurFrame->Instructions.push_back(Instruction);
440 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
441 MCSymbol *Label = EmitCFILabel();
442 MCCFIInstruction Instruction =
443 MCCFIInstruction::createRelOffset(Label, Register, Offset);
444 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
447 CurFrame->Instructions.push_back(Instruction);
450 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
452 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
455 CurFrame->Personality = Sym;
456 CurFrame->PersonalityEncoding = Encoding;
459 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
460 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
463 CurFrame->Lsda = Sym;
464 CurFrame->LsdaEncoding = Encoding;
467 void MCStreamer::EmitCFIRememberState() {
468 MCSymbol *Label = EmitCFILabel();
469 MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
470 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
473 CurFrame->Instructions.push_back(Instruction);
476 void MCStreamer::EmitCFIRestoreState() {
477 // FIXME: Error if there is no matching cfi_remember_state.
478 MCSymbol *Label = EmitCFILabel();
479 MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
480 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
483 CurFrame->Instructions.push_back(Instruction);
486 void MCStreamer::EmitCFISameValue(int64_t Register) {
487 MCSymbol *Label = EmitCFILabel();
488 MCCFIInstruction Instruction =
489 MCCFIInstruction::createSameValue(Label, Register);
490 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
493 CurFrame->Instructions.push_back(Instruction);
496 void MCStreamer::EmitCFIRestore(int64_t Register) {
497 MCSymbol *Label = EmitCFILabel();
498 MCCFIInstruction Instruction =
499 MCCFIInstruction::createRestore(Label, Register);
500 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
503 CurFrame->Instructions.push_back(Instruction);
506 void MCStreamer::EmitCFIEscape(StringRef Values) {
507 MCSymbol *Label = EmitCFILabel();
508 MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
509 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
512 CurFrame->Instructions.push_back(Instruction);
515 void MCStreamer::EmitCFIGnuArgsSize(int64_t Size) {
516 MCSymbol *Label = EmitCFILabel();
517 MCCFIInstruction Instruction =
518 MCCFIInstruction::createGnuArgsSize(Label, Size);
519 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
522 CurFrame->Instructions.push_back(Instruction);
525 void MCStreamer::EmitCFISignalFrame() {
526 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
529 CurFrame->IsSignalFrame = true;
532 void MCStreamer::EmitCFIUndefined(int64_t Register) {
533 MCSymbol *Label = EmitCFILabel();
534 MCCFIInstruction Instruction =
535 MCCFIInstruction::createUndefined(Label, Register);
536 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
539 CurFrame->Instructions.push_back(Instruction);
542 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
543 MCSymbol *Label = EmitCFILabel();
544 MCCFIInstruction Instruction =
545 MCCFIInstruction::createRegister(Label, Register1, Register2);
546 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
549 CurFrame->Instructions.push_back(Instruction);
552 void MCStreamer::EmitCFIWindowSave() {
553 MCSymbol *Label = EmitCFILabel();
554 MCCFIInstruction Instruction =
555 MCCFIInstruction::createWindowSave(Label);
556 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
559 CurFrame->Instructions.push_back(Instruction);
562 void MCStreamer::EmitCFIReturnColumn(int64_t Register) {
563 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
566 CurFrame->RAReg = Register;
569 WinEH::FrameInfo *MCStreamer::EnsureValidWinFrameInfo(SMLoc Loc) {
570 const MCAsmInfo *MAI = Context.getAsmInfo();
571 if (!MAI->usesWindowsCFI()) {
572 getContext().reportError(
573 Loc, ".seh_* directives are not supported on this target");
576 if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End) {
577 getContext().reportError(
578 Loc, ".seh_ directive must appear within an active frame");
581 return CurrentWinFrameInfo;
584 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) {
585 const MCAsmInfo *MAI = Context.getAsmInfo();
586 if (!MAI->usesWindowsCFI())
587 return getContext().reportError(
588 Loc, ".seh_* directives are not supported on this target");
589 if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
590 getContext().reportError(
591 Loc, "Starting a function before ending the previous one!");
593 MCSymbol *StartProc = EmitCFILabel();
595 WinFrameInfos.emplace_back(
596 llvm::make_unique<WinEH::FrameInfo>(Symbol, StartProc));
597 CurrentWinFrameInfo = WinFrameInfos.back().get();
598 CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
601 void MCStreamer::EmitWinCFIEndProc(SMLoc Loc) {
602 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
605 if (CurFrame->ChainedParent)
606 getContext().reportError(Loc, "Not all chained regions terminated!");
608 MCSymbol *Label = EmitCFILabel();
609 CurFrame->End = Label;
612 void MCStreamer::EmitWinCFIStartChained(SMLoc Loc) {
613 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
617 MCSymbol *StartProc = EmitCFILabel();
619 WinFrameInfos.emplace_back(llvm::make_unique<WinEH::FrameInfo>(
620 CurFrame->Function, StartProc, CurFrame));
621 CurrentWinFrameInfo = WinFrameInfos.back().get();
622 CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
625 void MCStreamer::EmitWinCFIEndChained(SMLoc Loc) {
626 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
629 if (!CurFrame->ChainedParent)
630 return getContext().reportError(
631 Loc, "End of a chained region outside a chained region!");
633 MCSymbol *Label = EmitCFILabel();
635 CurFrame->End = Label;
636 CurrentWinFrameInfo = const_cast<WinEH::FrameInfo *>(CurFrame->ChainedParent);
639 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except,
641 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
644 if (CurFrame->ChainedParent)
645 return getContext().reportError(
646 Loc, "Chained unwind areas can't have handlers!");
647 CurFrame->ExceptionHandler = Sym;
648 if (!Except && !Unwind)
649 getContext().reportError(Loc, "Don't know what kind of handler this is!");
651 CurFrame->HandlesUnwind = true;
653 CurFrame->HandlesExceptions = true;
656 void MCStreamer::EmitWinEHHandlerData(SMLoc Loc) {
657 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
660 if (CurFrame->ChainedParent)
661 getContext().reportError(Loc, "Chained unwind areas can't have handlers!");
664 static MCSection *getWinCFISection(MCContext &Context, unsigned *NextWinCFIID,
665 MCSection *MainCFISec,
666 const MCSection *TextSec) {
667 // If this is the main .text section, use the main unwind info section.
668 if (TextSec == Context.getObjectFileInfo()->getTextSection())
671 const auto *TextSecCOFF = cast<MCSectionCOFF>(TextSec);
672 unsigned UniqueID = TextSecCOFF->getOrAssignWinCFISectionID(NextWinCFIID);
674 // If this section is COMDAT, this unwind section should be COMDAT associative
676 const MCSymbol *KeySym = nullptr;
677 if (TextSecCOFF->getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT)
678 KeySym = TextSecCOFF->getCOMDATSymbol();
680 return Context.getAssociativeCOFFSection(cast<MCSectionCOFF>(MainCFISec),
684 MCSection *MCStreamer::getAssociatedPDataSection(const MCSection *TextSec) {
685 return getWinCFISection(getContext(), &NextWinCFIID,
686 getContext().getObjectFileInfo()->getPDataSection(),
690 MCSection *MCStreamer::getAssociatedXDataSection(const MCSection *TextSec) {
691 return getWinCFISection(getContext(), &NextWinCFIID,
692 getContext().getObjectFileInfo()->getXDataSection(),
696 void MCStreamer::EmitSyntaxDirective() {}
698 void MCStreamer::EmitWinCFIPushReg(unsigned Register, SMLoc Loc) {
699 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
703 MCSymbol *Label = EmitCFILabel();
705 WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
706 CurFrame->Instructions.push_back(Inst);
709 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset,
711 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
714 if (CurFrame->LastFrameInst >= 0)
715 return getContext().reportError(
716 Loc, "frame register and offset can be set at most once");
718 return getContext().reportError(Loc, "offset is not a multiple of 16");
720 return getContext().reportError(
721 Loc, "frame offset must be less than or equal to 240");
723 MCSymbol *Label = EmitCFILabel();
725 WinEH::Instruction Inst =
726 Win64EH::Instruction::SetFPReg(Label, Register, Offset);
727 CurFrame->LastFrameInst = CurFrame->Instructions.size();
728 CurFrame->Instructions.push_back(Inst);
731 void MCStreamer::EmitWinCFIAllocStack(unsigned Size, SMLoc Loc) {
732 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
736 return getContext().reportError(Loc,
737 "stack allocation size must be non-zero");
739 return getContext().reportError(
740 Loc, "stack allocation size is not a multiple of 8");
742 MCSymbol *Label = EmitCFILabel();
744 WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
745 CurFrame->Instructions.push_back(Inst);
748 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset,
750 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
755 return getContext().reportError(
756 Loc, "register save offset is not 8 byte aligned");
758 MCSymbol *Label = EmitCFILabel();
760 WinEH::Instruction Inst =
761 Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
762 CurFrame->Instructions.push_back(Inst);
765 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset,
767 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
771 return getContext().reportError(Loc, "offset is not a multiple of 16");
773 MCSymbol *Label = EmitCFILabel();
775 WinEH::Instruction Inst =
776 Win64EH::Instruction::SaveXMM(Label, Register, Offset);
777 CurFrame->Instructions.push_back(Inst);
780 void MCStreamer::EmitWinCFIPushFrame(bool Code, SMLoc Loc) {
781 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
784 if (!CurFrame->Instructions.empty())
785 return getContext().reportError(
786 Loc, "If present, PushMachFrame must be the first UOP");
788 MCSymbol *Label = EmitCFILabel();
790 WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
791 CurFrame->Instructions.push_back(Inst);
794 void MCStreamer::EmitWinCFIEndProlog(SMLoc Loc) {
795 WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
799 MCSymbol *Label = EmitCFILabel();
801 CurFrame->PrologEnd = Label;
804 void MCStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
807 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
810 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) {}
812 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
813 /// the specified string in the output .s file. This capability is
814 /// indicated by the hasRawTextSupport() predicate.
815 void MCStreamer::EmitRawTextImpl(StringRef String) {
816 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
817 " something must not be fully mc'ized\n";
821 void MCStreamer::EmitRawText(const Twine &T) {
822 SmallString<128> Str;
823 EmitRawTextImpl(T.toStringRef(Str));
826 void MCStreamer::EmitWindowsUnwindTables() {
829 void MCStreamer::Finish() {
830 if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
831 getContext().reportError(SMLoc(), "Unfinished frame!");
832 if (!WinFrameInfos.empty() && !WinFrameInfos.back()->End)
833 getContext().reportError(SMLoc(), "Unfinished frame!");
835 MCTargetStreamer *TS = getTargetStreamer();
842 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
843 visitUsedExpr(*Value);
844 Symbol->setVariableValue(Value);
846 MCTargetStreamer *TS = getTargetStreamer();
848 TS->emitAssignment(Symbol, Value);
851 void MCTargetStreamer::prettyPrintAsm(MCInstPrinter &InstPrinter, raw_ostream &OS,
852 const MCInst &Inst, const MCSubtargetInfo &STI) {
853 InstPrinter.printInst(&Inst, OS, "", STI);
856 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
859 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
860 switch (Expr.getKind()) {
862 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
865 case MCExpr::Constant:
868 case MCExpr::Binary: {
869 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
870 visitUsedExpr(*BE.getLHS());
871 visitUsedExpr(*BE.getRHS());
875 case MCExpr::SymbolRef:
876 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
880 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
885 void MCStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
888 for (unsigned i = Inst.getNumOperands(); i--;)
889 if (Inst.getOperand(i).isExpr())
890 visitUsedExpr(*Inst.getOperand(i).getExpr());
893 void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
895 // Get the Hi-Lo expression.
897 MCBinaryExpr::createSub(MCSymbolRefExpr::create(Hi, Context),
898 MCSymbolRefExpr::create(Lo, Context), Context);
900 const MCAsmInfo *MAI = Context.getAsmInfo();
901 if (!MAI->doesSetDirectiveSuppressReloc()) {
902 EmitValue(Diff, Size);
906 // Otherwise, emit with .set (aka assignment).
907 MCSymbol *SetLabel = Context.createTempSymbol("set", true);
908 EmitAssignment(SetLabel, Diff);
909 EmitSymbolValue(SetLabel, Size);
912 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
913 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
914 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
915 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
916 llvm_unreachable("this directive only supported on COFF targets");
918 void MCStreamer::EndCOFFSymbolDef() {
919 llvm_unreachable("this directive only supported on COFF targets");
921 void MCStreamer::EmitFileDirective(StringRef Filename) {}
922 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
923 llvm_unreachable("this directive only supported on COFF targets");
925 void MCStreamer::EmitCOFFSymbolType(int Type) {
926 llvm_unreachable("this directive only supported on COFF targets");
928 void MCStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
929 void MCStreamer::emitELFSymverDirective(MCSymbol *Alias,
930 const MCSymbol *Aliasee) {}
931 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
932 unsigned ByteAlignment) {}
933 void MCStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
934 uint64_t Size, unsigned ByteAlignment) {}
935 void MCStreamer::ChangeSection(MCSection *, const MCExpr *) {}
936 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
937 void MCStreamer::EmitBytes(StringRef Data) {}
938 void MCStreamer::EmitBinaryData(StringRef Data) { EmitBytes(Data); }
939 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) {
940 visitUsedExpr(*Value);
942 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
943 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
944 void MCStreamer::emitFill(const MCExpr &NumBytes, uint64_t Value, SMLoc Loc) {}
945 void MCStreamer::emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
947 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
949 unsigned MaxBytesToEmit) {}
950 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
951 unsigned MaxBytesToEmit) {}
952 void MCStreamer::emitValueToOffset(const MCExpr *Offset, unsigned char Value,
954 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
955 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
956 void MCStreamer::FinishImpl() {}
957 void MCStreamer::EmitBundleUnlock() {}
959 void MCStreamer::SwitchSection(MCSection *Section, const MCExpr *Subsection) {
960 assert(Section && "Cannot switch to a null section!");
961 MCSectionSubPair curSection = SectionStack.back().first;
962 SectionStack.back().second = curSection;
963 if (MCSectionSubPair(Section, Subsection) != curSection) {
964 ChangeSection(Section, Subsection);
965 SectionStack.back().first = MCSectionSubPair(Section, Subsection);
966 assert(!Section->hasEnded() && "Section already ended");
967 MCSymbol *Sym = Section->getBeginSymbol();
968 if (Sym && !Sym->isInSection())
973 MCSymbol *MCStreamer::endSection(MCSection *Section) {
974 // TODO: keep track of the last subsection so that this symbol appears in the
976 MCSymbol *Sym = Section->getEndSymbol(Context);
977 if (Sym->isInSection())
980 SwitchSection(Section);
985 void MCStreamer::EmitVersionForTarget(const Triple &Target) {
986 if (!Target.isOSBinFormatMachO() || !Target.isOSDarwin())
988 // Do we even know the version?
989 if (Target.getOSMajorVersion() == 0)
995 MCVersionMinType VersionType;
996 if (Target.isWatchOS()) {
997 VersionType = MCVM_WatchOSVersionMin;
998 Target.getWatchOSVersion(Major, Minor, Update);
999 } else if (Target.isTvOS()) {
1000 VersionType = MCVM_TvOSVersionMin;
1001 Target.getiOSVersion(Major, Minor, Update);
1002 } else if (Target.isMacOSX()) {
1003 VersionType = MCVM_OSXVersionMin;
1004 if (!Target.getMacOSXVersion(Major, Minor, Update))
1007 VersionType = MCVM_IOSVersionMin;
1008 Target.getiOSVersion(Major, Minor, Update);
1011 EmitVersionMin(VersionType, Major, Minor, Update);