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/ADT/SmallString.h"
11 #include "llvm/ADT/StringRef.h"
12 #include "llvm/ADT/Twine.h"
13 #include "llvm/MC/MCAsmBackend.h"
14 #include "llvm/MC/MCAsmInfo.h"
15 #include "llvm/MC/MCCodeView.h"
16 #include "llvm/MC/MCContext.h"
17 #include "llvm/MC/MCDwarf.h"
18 #include "llvm/MC/MCExpr.h"
19 #include "llvm/MC/MCInst.h"
20 #include "llvm/MC/MCInstPrinter.h"
21 #include "llvm/MC/MCObjectFileInfo.h"
22 #include "llvm/MC/MCSection.h"
23 #include "llvm/MC/MCSectionCOFF.h"
24 #include "llvm/MC/MCStreamer.h"
25 #include "llvm/MC/MCSymbol.h"
26 #include "llvm/MC/MCWin64EH.h"
27 #include "llvm/MC/MCWinEH.h"
28 #include "llvm/Support/Casting.h"
29 #include "llvm/Support/COFF.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::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
54 MCStreamer::MCStreamer(MCContext &Ctx)
55 : Context(Ctx), CurrentWinFrameInfo(nullptr) {
56 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
59 MCStreamer::~MCStreamer() {
60 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
61 delete WinFrameInfos[i];
64 void MCStreamer::reset() {
65 DwarfFrameInfos.clear();
66 for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
67 delete WinFrameInfos[i];
68 WinFrameInfos.clear();
69 CurrentWinFrameInfo = nullptr;
70 SymbolOrdering.clear();
72 SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
75 raw_ostream &MCStreamer::GetCommentOS() {
76 // By default, discard comments.
80 void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
82 void MCStreamer::addExplicitComment(const Twine &T) {}
83 void MCStreamer::emitExplicitComments() {}
85 void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
86 for (auto &FI : DwarfFrameInfos)
87 FI.CompactUnwindEncoding =
88 (MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
91 /// EmitIntValue - Special case of EmitValue that avoids the client having to
92 /// pass in a MCExpr for constant integers.
93 void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
94 assert(1 <= Size && Size <= 8 && "Invalid size");
95 assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
98 const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
99 for (unsigned i = 0; i != Size; ++i) {
100 unsigned index = isLittleEndian ? i : (Size - i - 1);
101 buf[i] = uint8_t(Value >> (index * 8));
103 EmitBytes(StringRef(buf, Size));
106 /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
107 /// client having to pass in a MCExpr for constant integers.
108 void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
109 SmallString<128> Tmp;
110 raw_svector_ostream OSE(Tmp);
111 encodeULEB128(Value, OSE, Padding);
112 EmitBytes(OSE.str());
115 /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
116 /// client having to pass in a MCExpr for constant integers.
117 void MCStreamer::EmitSLEB128IntValue(int64_t Value) {
118 SmallString<128> Tmp;
119 raw_svector_ostream OSE(Tmp);
120 encodeSLEB128(Value, OSE);
121 EmitBytes(OSE.str());
124 void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, SMLoc Loc) {
125 EmitValueImpl(Value, Size, Loc);
128 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
129 bool IsSectionRelative) {
130 assert((!IsSectionRelative || Size == 4) &&
131 "SectionRelative value requires 4-bytes");
133 if (!IsSectionRelative)
134 EmitValueImpl(MCSymbolRefExpr::create(Sym, getContext()), Size);
136 EmitCOFFSecRel32(Sym, /*Offset=*/0);
139 void MCStreamer::EmitDTPRel64Value(const MCExpr *Value) {
140 report_fatal_error("unsupported directive in streamer");
143 void MCStreamer::EmitDTPRel32Value(const MCExpr *Value) {
144 report_fatal_error("unsupported directive in streamer");
147 void MCStreamer::EmitTPRel64Value(const MCExpr *Value) {
148 report_fatal_error("unsupported directive in streamer");
151 void MCStreamer::EmitTPRel32Value(const MCExpr *Value) {
152 report_fatal_error("unsupported directive in streamer");
155 void MCStreamer::EmitGPRel64Value(const MCExpr *Value) {
156 report_fatal_error("unsupported directive in streamer");
159 void MCStreamer::EmitGPRel32Value(const MCExpr *Value) {
160 report_fatal_error("unsupported directive in streamer");
163 /// Emit NumBytes bytes worth of the value specified by FillValue.
164 /// This implements directives such as '.space'.
165 void MCStreamer::emitFill(uint64_t NumBytes, uint8_t FillValue) {
166 for (uint64_t i = 0, e = NumBytes; i != e; ++i)
167 EmitIntValue(FillValue, 1);
170 void MCStreamer::emitFill(uint64_t NumValues, int64_t Size, int64_t Expr) {
171 int64_t NonZeroSize = Size > 4 ? 4 : Size;
172 Expr &= ~0ULL >> (64 - NonZeroSize * 8);
173 for (uint64_t i = 0, e = NumValues; i != e; ++i) {
174 EmitIntValue(Expr, NonZeroSize);
175 if (NonZeroSize < Size)
176 EmitIntValue(0, Size - NonZeroSize);
180 /// The implementation in this class just redirects to emitFill.
181 void MCStreamer::EmitZeros(uint64_t NumBytes) {
182 emitFill(NumBytes, 0);
185 unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
187 StringRef Filename, unsigned CUID) {
188 return getContext().getDwarfFile(Directory, Filename, FileNo, CUID);
191 void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
192 unsigned Column, unsigned Flags,
194 unsigned Discriminator,
195 StringRef FileName) {
196 getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
200 MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
201 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
202 if (!Table.getLabel()) {
203 StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
205 Context.getOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
207 return Table.getLabel();
210 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
211 if (DwarfFrameInfos.empty())
213 return &DwarfFrameInfos.back();
216 bool MCStreamer::hasUnfinishedDwarfFrameInfo() {
217 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
218 return CurFrame && !CurFrame->End;
221 void MCStreamer::EnsureValidDwarfFrame() {
222 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
223 if (!CurFrame || CurFrame->End)
224 report_fatal_error("No open frame");
227 bool MCStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename) {
228 return getContext().getCVContext().addFile(FileNo, Filename);
231 bool MCStreamer::EmitCVFuncIdDirective(unsigned FunctionId) {
232 return getContext().getCVContext().recordFunctionId(FunctionId);
235 bool MCStreamer::EmitCVInlineSiteIdDirective(unsigned FunctionId,
236 unsigned IAFunc, unsigned IAFile,
237 unsigned IALine, unsigned IACol,
239 if (getContext().getCVContext().getCVFunctionInfo(IAFunc) == nullptr) {
240 getContext().reportError(Loc, "parent function id not introduced by "
241 ".cv_func_id or .cv_inline_site_id");
245 return getContext().getCVContext().recordInlinedCallSiteId(
246 FunctionId, IAFunc, IAFile, IALine, IACol);
249 void MCStreamer::EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
250 unsigned Line, unsigned Column,
251 bool PrologueEnd, bool IsStmt,
252 StringRef FileName, SMLoc Loc) {
253 CodeViewContext &CVC = getContext().getCVContext();
254 MCCVFunctionInfo *FI = CVC.getCVFunctionInfo(FunctionId);
256 return getContext().reportError(
257 Loc, "function id not introduced by .cv_func_id or .cv_inline_site_id");
260 if (FI->Section == nullptr)
261 FI->Section = getCurrentSectionOnly();
262 else if (FI->Section != getCurrentSectionOnly())
263 return getContext().reportError(
265 "all .cv_loc directives for a function must be in the same section");
267 CVC.setCurrentCVLoc(FunctionId, FileNo, Line, Column, PrologueEnd, IsStmt);
270 void MCStreamer::EmitCVLinetableDirective(unsigned FunctionId,
271 const MCSymbol *Begin,
272 const MCSymbol *End) {}
274 void MCStreamer::EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
275 unsigned SourceFileId,
276 unsigned SourceLineNum,
277 const MCSymbol *FnStartSym,
278 const MCSymbol *FnEndSym) {}
280 void MCStreamer::EmitCVDefRangeDirective(
281 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
282 StringRef FixedSizePortion) {}
284 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
285 MCSymbol *EHSymbol) {
288 void MCStreamer::InitSections(bool NoExecStack) {
289 SwitchSection(getContext().getObjectFileInfo()->getTextSection());
292 void MCStreamer::AssignFragment(MCSymbol *Symbol, MCFragment *Fragment) {
294 Symbol->setFragment(Fragment);
296 // As we emit symbols into a section, track the order so that they can
297 // be sorted upon later. Zero is reserved to mean 'unemitted'.
298 SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
301 void MCStreamer::EmitLabel(MCSymbol *Symbol, SMLoc Loc) {
302 Symbol->redefineIfPossible();
304 if (!Symbol->isUndefined() || Symbol->isVariable())
305 return getContext().reportError(Loc, "invalid symbol redefinition");
307 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
308 assert(getCurrentSectionOnly() && "Cannot emit before setting section!");
309 assert(!Symbol->getFragment() && "Unexpected fragment on symbol data!");
310 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
312 Symbol->setFragment(&getCurrentSectionOnly()->getDummyFragment());
314 MCTargetStreamer *TS = getTargetStreamer();
316 TS->emitLabel(Symbol);
319 void MCStreamer::EmitCFISections(bool EH, bool Debug) {
323 void MCStreamer::EmitCFIStartProc(bool IsSimple) {
324 if (hasUnfinishedDwarfFrameInfo())
325 report_fatal_error("Starting a frame before finishing the previous one!");
327 MCDwarfFrameInfo Frame;
328 Frame.IsSimple = IsSimple;
329 EmitCFIStartProcImpl(Frame);
331 const MCAsmInfo* MAI = Context.getAsmInfo();
333 for (const MCCFIInstruction& Inst : MAI->getInitialFrameState()) {
334 if (Inst.getOperation() == MCCFIInstruction::OpDefCfa ||
335 Inst.getOperation() == MCCFIInstruction::OpDefCfaRegister) {
336 Frame.CurrentCfaRegister = Inst.getRegister();
341 DwarfFrameInfos.push_back(Frame);
344 void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
347 void MCStreamer::EmitCFIEndProc() {
348 EnsureValidDwarfFrame();
349 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
350 EmitCFIEndProcImpl(*CurFrame);
353 void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
354 // Put a dummy non-null value in Frame.End to mark that this frame has been
356 Frame.End = (MCSymbol *) 1;
359 MCSymbol *MCStreamer::EmitCFILabel() {
360 MCSymbol *Label = getContext().createTempSymbol("cfi", true);
365 MCSymbol *MCStreamer::EmitCFICommon() {
366 EnsureValidDwarfFrame();
367 return EmitCFILabel();
370 void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
371 MCSymbol *Label = EmitCFICommon();
372 MCCFIInstruction Instruction =
373 MCCFIInstruction::createDefCfa(Label, Register, Offset);
374 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
375 CurFrame->Instructions.push_back(Instruction);
376 CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
379 void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
380 MCSymbol *Label = EmitCFICommon();
381 MCCFIInstruction Instruction =
382 MCCFIInstruction::createDefCfaOffset(Label, Offset);
383 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
384 CurFrame->Instructions.push_back(Instruction);
387 void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
388 MCSymbol *Label = EmitCFICommon();
389 MCCFIInstruction Instruction =
390 MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
391 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
392 CurFrame->Instructions.push_back(Instruction);
395 void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
396 MCSymbol *Label = EmitCFICommon();
397 MCCFIInstruction Instruction =
398 MCCFIInstruction::createDefCfaRegister(Label, Register);
399 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
400 CurFrame->Instructions.push_back(Instruction);
401 CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
404 void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
405 MCSymbol *Label = EmitCFICommon();
406 MCCFIInstruction Instruction =
407 MCCFIInstruction::createOffset(Label, Register, Offset);
408 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
409 CurFrame->Instructions.push_back(Instruction);
412 void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
413 MCSymbol *Label = EmitCFICommon();
414 MCCFIInstruction Instruction =
415 MCCFIInstruction::createRelOffset(Label, Register, Offset);
416 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
417 CurFrame->Instructions.push_back(Instruction);
420 void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
422 EnsureValidDwarfFrame();
423 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
424 CurFrame->Personality = Sym;
425 CurFrame->PersonalityEncoding = Encoding;
428 void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
429 EnsureValidDwarfFrame();
430 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
431 CurFrame->Lsda = Sym;
432 CurFrame->LsdaEncoding = Encoding;
435 void MCStreamer::EmitCFIRememberState() {
436 MCSymbol *Label = EmitCFICommon();
437 MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
438 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
439 CurFrame->Instructions.push_back(Instruction);
442 void MCStreamer::EmitCFIRestoreState() {
443 // FIXME: Error if there is no matching cfi_remember_state.
444 MCSymbol *Label = EmitCFICommon();
445 MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
446 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
447 CurFrame->Instructions.push_back(Instruction);
450 void MCStreamer::EmitCFISameValue(int64_t Register) {
451 MCSymbol *Label = EmitCFICommon();
452 MCCFIInstruction Instruction =
453 MCCFIInstruction::createSameValue(Label, Register);
454 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
455 CurFrame->Instructions.push_back(Instruction);
458 void MCStreamer::EmitCFIRestore(int64_t Register) {
459 MCSymbol *Label = EmitCFICommon();
460 MCCFIInstruction Instruction =
461 MCCFIInstruction::createRestore(Label, Register);
462 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
463 CurFrame->Instructions.push_back(Instruction);
466 void MCStreamer::EmitCFIEscape(StringRef Values) {
467 MCSymbol *Label = EmitCFICommon();
468 MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
469 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
470 CurFrame->Instructions.push_back(Instruction);
473 void MCStreamer::EmitCFIGnuArgsSize(int64_t Size) {
474 MCSymbol *Label = EmitCFICommon();
475 MCCFIInstruction Instruction =
476 MCCFIInstruction::createGnuArgsSize(Label, Size);
477 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
478 CurFrame->Instructions.push_back(Instruction);
481 void MCStreamer::EmitCFISignalFrame() {
482 EnsureValidDwarfFrame();
483 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
484 CurFrame->IsSignalFrame = true;
487 void MCStreamer::EmitCFIUndefined(int64_t Register) {
488 MCSymbol *Label = EmitCFICommon();
489 MCCFIInstruction Instruction =
490 MCCFIInstruction::createUndefined(Label, Register);
491 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
492 CurFrame->Instructions.push_back(Instruction);
495 void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
496 MCSymbol *Label = EmitCFICommon();
497 MCCFIInstruction Instruction =
498 MCCFIInstruction::createRegister(Label, Register1, Register2);
499 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
500 CurFrame->Instructions.push_back(Instruction);
503 void MCStreamer::EmitCFIWindowSave() {
504 MCSymbol *Label = EmitCFICommon();
505 MCCFIInstruction Instruction =
506 MCCFIInstruction::createWindowSave(Label);
507 MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
508 CurFrame->Instructions.push_back(Instruction);
511 void MCStreamer::EnsureValidWinFrameInfo() {
512 const MCAsmInfo *MAI = Context.getAsmInfo();
513 if (!MAI->usesWindowsCFI())
514 report_fatal_error(".seh_* directives are not supported on this target");
515 if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
516 report_fatal_error("No open Win64 EH frame function!");
519 void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
520 const MCAsmInfo *MAI = Context.getAsmInfo();
521 if (!MAI->usesWindowsCFI())
522 report_fatal_error(".seh_* directives are not supported on this target");
523 if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
524 report_fatal_error("Starting a function before ending the previous one!");
526 MCSymbol *StartProc = EmitCFILabel();
528 WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));
529 CurrentWinFrameInfo = WinFrameInfos.back();
530 CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
533 void MCStreamer::EmitWinCFIEndProc() {
534 EnsureValidWinFrameInfo();
535 if (CurrentWinFrameInfo->ChainedParent)
536 report_fatal_error("Not all chained regions terminated!");
538 MCSymbol *Label = EmitCFILabel();
539 CurrentWinFrameInfo->End = Label;
542 void MCStreamer::EmitWinCFIStartChained() {
543 EnsureValidWinFrameInfo();
545 MCSymbol *StartProc = EmitCFILabel();
547 WinFrameInfos.push_back(new WinEH::FrameInfo(CurrentWinFrameInfo->Function,
548 StartProc, CurrentWinFrameInfo));
549 CurrentWinFrameInfo = WinFrameInfos.back();
550 CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
553 void MCStreamer::EmitWinCFIEndChained() {
554 EnsureValidWinFrameInfo();
555 if (!CurrentWinFrameInfo->ChainedParent)
556 report_fatal_error("End of a chained region outside a chained region!");
558 MCSymbol *Label = EmitCFILabel();
560 CurrentWinFrameInfo->End = Label;
561 CurrentWinFrameInfo =
562 const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->ChainedParent);
565 void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
567 EnsureValidWinFrameInfo();
568 if (CurrentWinFrameInfo->ChainedParent)
569 report_fatal_error("Chained unwind areas can't have handlers!");
570 CurrentWinFrameInfo->ExceptionHandler = Sym;
571 if (!Except && !Unwind)
572 report_fatal_error("Don't know what kind of handler this is!");
574 CurrentWinFrameInfo->HandlesUnwind = true;
576 CurrentWinFrameInfo->HandlesExceptions = true;
579 void MCStreamer::EmitWinEHHandlerData() {
580 EnsureValidWinFrameInfo();
581 if (CurrentWinFrameInfo->ChainedParent)
582 report_fatal_error("Chained unwind areas can't have handlers!");
585 static MCSection *getWinCFISection(MCContext &Context, unsigned *NextWinCFIID,
586 MCSection *MainCFISec,
587 const MCSection *TextSec) {
588 // If this is the main .text section, use the main unwind info section.
589 if (TextSec == Context.getObjectFileInfo()->getTextSection())
592 const auto *TextSecCOFF = cast<MCSectionCOFF>(TextSec);
593 unsigned UniqueID = TextSecCOFF->getOrAssignWinCFISectionID(NextWinCFIID);
595 // If this section is COMDAT, this unwind section should be COMDAT associative
597 const MCSymbol *KeySym = nullptr;
598 if (TextSecCOFF->getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT)
599 KeySym = TextSecCOFF->getCOMDATSymbol();
601 return Context.getAssociativeCOFFSection(cast<MCSectionCOFF>(MainCFISec),
605 MCSection *MCStreamer::getAssociatedPDataSection(const MCSection *TextSec) {
606 return getWinCFISection(getContext(), &NextWinCFIID,
607 getContext().getObjectFileInfo()->getPDataSection(),
611 MCSection *MCStreamer::getAssociatedXDataSection(const MCSection *TextSec) {
612 return getWinCFISection(getContext(), &NextWinCFIID,
613 getContext().getObjectFileInfo()->getXDataSection(),
617 void MCStreamer::EmitSyntaxDirective() {}
619 void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
620 EnsureValidWinFrameInfo();
622 MCSymbol *Label = EmitCFILabel();
624 WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
625 CurrentWinFrameInfo->Instructions.push_back(Inst);
628 void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
629 EnsureValidWinFrameInfo();
630 if (CurrentWinFrameInfo->LastFrameInst >= 0)
631 report_fatal_error("Frame register and offset already specified!");
633 report_fatal_error("Misaligned frame pointer offset!");
635 report_fatal_error("Frame offset must be less than or equal to 240!");
637 MCSymbol *Label = EmitCFILabel();
639 WinEH::Instruction Inst =
640 Win64EH::Instruction::SetFPReg(Label, Register, Offset);
641 CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
642 CurrentWinFrameInfo->Instructions.push_back(Inst);
645 void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
646 EnsureValidWinFrameInfo();
648 report_fatal_error("Allocation size must be non-zero!");
650 report_fatal_error("Misaligned stack allocation!");
652 MCSymbol *Label = EmitCFILabel();
654 WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
655 CurrentWinFrameInfo->Instructions.push_back(Inst);
658 void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
659 EnsureValidWinFrameInfo();
661 report_fatal_error("Misaligned saved register offset!");
663 MCSymbol *Label = EmitCFILabel();
665 WinEH::Instruction Inst =
666 Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
667 CurrentWinFrameInfo->Instructions.push_back(Inst);
670 void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
671 EnsureValidWinFrameInfo();
673 report_fatal_error("Misaligned saved vector register offset!");
675 MCSymbol *Label = EmitCFILabel();
677 WinEH::Instruction Inst =
678 Win64EH::Instruction::SaveXMM(Label, Register, Offset);
679 CurrentWinFrameInfo->Instructions.push_back(Inst);
682 void MCStreamer::EmitWinCFIPushFrame(bool Code) {
683 EnsureValidWinFrameInfo();
684 if (!CurrentWinFrameInfo->Instructions.empty())
685 report_fatal_error("If present, PushMachFrame must be the first UOP");
687 MCSymbol *Label = EmitCFILabel();
689 WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
690 CurrentWinFrameInfo->Instructions.push_back(Inst);
693 void MCStreamer::EmitWinCFIEndProlog() {
694 EnsureValidWinFrameInfo();
696 MCSymbol *Label = EmitCFILabel();
698 CurrentWinFrameInfo->PrologEnd = Label;
701 void MCStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
704 void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
707 void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) {}
709 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
710 /// the specified string in the output .s file. This capability is
711 /// indicated by the hasRawTextSupport() predicate.
712 void MCStreamer::EmitRawTextImpl(StringRef String) {
713 errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
714 " something must not be fully mc'ized\n";
718 void MCStreamer::EmitRawText(const Twine &T) {
719 SmallString<128> Str;
720 EmitRawTextImpl(T.toStringRef(Str));
723 void MCStreamer::EmitWindowsUnwindTables() {
726 void MCStreamer::Finish() {
727 if (!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End)
728 report_fatal_error("Unfinished frame!");
730 MCTargetStreamer *TS = getTargetStreamer();
737 void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
738 visitUsedExpr(*Value);
739 Symbol->setVariableValue(Value);
741 MCTargetStreamer *TS = getTargetStreamer();
743 TS->emitAssignment(Symbol, Value);
746 void MCTargetStreamer::prettyPrintAsm(MCInstPrinter &InstPrinter, raw_ostream &OS,
747 const MCInst &Inst, const MCSubtargetInfo &STI) {
748 InstPrinter.printInst(&Inst, OS, "", STI);
751 void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
754 void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
755 switch (Expr.getKind()) {
757 cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
760 case MCExpr::Constant:
763 case MCExpr::Binary: {
764 const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
765 visitUsedExpr(*BE.getLHS());
766 visitUsedExpr(*BE.getRHS());
770 case MCExpr::SymbolRef:
771 visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
775 visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
780 void MCStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI,
783 for (unsigned i = Inst.getNumOperands(); i--;)
784 if (Inst.getOperand(i).isExpr())
785 visitUsedExpr(*Inst.getOperand(i).getExpr());
788 void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
790 // Get the Hi-Lo expression.
792 MCBinaryExpr::createSub(MCSymbolRefExpr::create(Hi, Context),
793 MCSymbolRefExpr::create(Lo, Context), Context);
795 const MCAsmInfo *MAI = Context.getAsmInfo();
796 if (!MAI->doesSetDirectiveSuppressReloc()) {
797 EmitValue(Diff, Size);
801 // Otherwise, emit with .set (aka assignment).
802 MCSymbol *SetLabel = Context.createTempSymbol("set", true);
803 EmitAssignment(SetLabel, Diff);
804 EmitSymbolValue(SetLabel, Size);
807 void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
808 void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
809 void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
810 void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
811 llvm_unreachable("this directive only supported on COFF targets");
813 void MCStreamer::EndCOFFSymbolDef() {
814 llvm_unreachable("this directive only supported on COFF targets");
816 void MCStreamer::EmitFileDirective(StringRef Filename) {}
817 void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
818 llvm_unreachable("this directive only supported on COFF targets");
820 void MCStreamer::EmitCOFFSymbolType(int Type) {
821 llvm_unreachable("this directive only supported on COFF targets");
823 void MCStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
824 void MCStreamer::emitELFSymverDirective(MCSymbol *Alias,
825 const MCSymbol *Aliasee) {}
826 void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
827 unsigned ByteAlignment) {}
828 void MCStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
829 uint64_t Size, unsigned ByteAlignment) {}
830 void MCStreamer::ChangeSection(MCSection *, const MCExpr *) {}
831 void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
832 void MCStreamer::EmitBytes(StringRef Data) {}
833 void MCStreamer::EmitBinaryData(StringRef Data) { EmitBytes(Data); }
834 void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) {
835 visitUsedExpr(*Value);
837 void MCStreamer::EmitULEB128Value(const MCExpr *Value) {}
838 void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {}
839 void MCStreamer::emitFill(const MCExpr &NumBytes, uint64_t Value, SMLoc Loc) {}
840 void MCStreamer::emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
842 void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
844 unsigned MaxBytesToEmit) {}
845 void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment,
846 unsigned MaxBytesToEmit) {}
847 void MCStreamer::emitValueToOffset(const MCExpr *Offset, unsigned char Value,
849 void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {}
850 void MCStreamer::EmitBundleLock(bool AlignToEnd) {}
851 void MCStreamer::FinishImpl() {}
852 void MCStreamer::EmitBundleUnlock() {}
854 void MCStreamer::SwitchSection(MCSection *Section, const MCExpr *Subsection) {
855 assert(Section && "Cannot switch to a null section!");
856 MCSectionSubPair curSection = SectionStack.back().first;
857 SectionStack.back().second = curSection;
858 if (MCSectionSubPair(Section, Subsection) != curSection) {
859 ChangeSection(Section, Subsection);
860 SectionStack.back().first = MCSectionSubPair(Section, Subsection);
861 assert(!Section->hasEnded() && "Section already ended");
862 MCSymbol *Sym = Section->getBeginSymbol();
863 if (Sym && !Sym->isInSection())
868 MCSymbol *MCStreamer::endSection(MCSection *Section) {
869 // TODO: keep track of the last subsection so that this symbol appears in the
871 MCSymbol *Sym = Section->getEndSymbol(Context);
872 if (Sym->isInSection())
875 SwitchSection(Section);