1 //===- lib/MC/MCAsmStreamer.cpp - Text Assembly 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/STLExtras.h"
12 #include "llvm/ADT/SmallString.h"
13 #include "llvm/ADT/StringExtras.h"
14 #include "llvm/ADT/Twine.h"
15 #include "llvm/MC/MCAsmBackend.h"
16 #include "llvm/MC/MCAsmInfo.h"
17 #include "llvm/MC/MCCodeEmitter.h"
18 #include "llvm/MC/MCContext.h"
19 #include "llvm/MC/MCExpr.h"
20 #include "llvm/MC/MCFixupKindInfo.h"
21 #include "llvm/MC/MCInst.h"
22 #include "llvm/MC/MCInstPrinter.h"
23 #include "llvm/MC/MCObjectFileInfo.h"
24 #include "llvm/MC/MCRegisterInfo.h"
25 #include "llvm/MC/MCSectionCOFF.h"
26 #include "llvm/MC/MCSectionMachO.h"
27 #include "llvm/MC/MCSymbolELF.h"
28 #include "llvm/Support/CommandLine.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Support/Format.h"
31 #include "llvm/Support/FormattedStream.h"
32 #include "llvm/Support/MathExtras.h"
33 #include "llvm/Support/Path.h"
39 class MCAsmStreamer final : public MCStreamer {
40 std::unique_ptr<formatted_raw_ostream> OSOwner;
41 formatted_raw_ostream &OS;
43 std::unique_ptr<MCInstPrinter> InstPrinter;
44 std::unique_ptr<MCCodeEmitter> Emitter;
45 std::unique_ptr<MCAsmBackend> AsmBackend;
47 SmallString<128> CommentToEmit;
48 raw_svector_ostream CommentStream;
50 unsigned IsVerboseAsm : 1;
51 unsigned ShowInst : 1;
52 unsigned UseDwarfDirectory : 1;
54 void EmitRegisterName(int64_t Register);
55 void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override;
56 void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override;
59 MCAsmStreamer(MCContext &Context, std::unique_ptr<formatted_raw_ostream> os,
60 bool isVerboseAsm, bool useDwarfDirectory,
61 MCInstPrinter *printer, MCCodeEmitter *emitter,
62 MCAsmBackend *asmbackend, bool showInst)
63 : MCStreamer(Context), OSOwner(std::move(os)), OS(*OSOwner),
64 MAI(Context.getAsmInfo()), InstPrinter(printer), Emitter(emitter),
65 AsmBackend(asmbackend), CommentStream(CommentToEmit),
66 IsVerboseAsm(isVerboseAsm), ShowInst(showInst),
67 UseDwarfDirectory(useDwarfDirectory) {
70 InstPrinter->setCommentStream(CommentStream);
73 inline void EmitEOL() {
74 // If we don't have any comments, just emit a \n.
81 void EmitCommentsAndEOL();
83 /// isVerboseAsm - Return true if this streamer supports verbose assembly at
85 bool isVerboseAsm() const override { return IsVerboseAsm; }
87 /// hasRawTextSupport - We support EmitRawText.
88 bool hasRawTextSupport() const override { return true; }
90 /// AddComment - Add a comment that can be emitted to the generated .s
91 /// file if applicable as a QoI issue to make the output of the compiler
92 /// more readable. This only affects the MCAsmStreamer, and only when
93 /// verbose assembly output is enabled.
94 void AddComment(const Twine &T) override;
96 /// AddEncodingComment - Add a comment showing the encoding of an instruction.
97 void AddEncodingComment(const MCInst &Inst, const MCSubtargetInfo &);
99 /// GetCommentOS - Return a raw_ostream that comments can be written to.
100 /// Unlike AddComment, you are required to terminate comments with \n if you
102 raw_ostream &GetCommentOS() override {
104 return nulls(); // Discard comments unless in verbose asm mode.
105 return CommentStream;
108 void emitRawComment(const Twine &T, bool TabPrefix = true) override;
110 /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
111 void AddBlankLine() override {
115 /// @name MCStreamer Interface
118 void ChangeSection(MCSection *Section, const MCExpr *Subsection) override;
120 void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override;
121 void EmitLabel(MCSymbol *Symbol) override;
123 void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
124 void EmitLinkerOptions(ArrayRef<std::string> Options) override;
125 void EmitDataRegion(MCDataRegionType Kind) override;
126 void EmitVersionMin(MCVersionMinType Kind, unsigned Major, unsigned Minor,
127 unsigned Update) override;
128 void EmitThumbFunc(MCSymbol *Func) override;
130 void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
131 void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
132 bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
134 void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
135 void BeginCOFFSymbolDef(const MCSymbol *Symbol) override;
136 void EmitCOFFSymbolStorageClass(int StorageClass) override;
137 void EmitCOFFSymbolType(int Type) override;
138 void EndCOFFSymbolDef() override;
139 void EmitCOFFSafeSEH(MCSymbol const *Symbol) override;
140 void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
141 void EmitCOFFSecRel32(MCSymbol const *Symbol) override;
142 void emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) override;
143 void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
144 unsigned ByteAlignment) override;
146 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
148 /// @param Symbol - The common symbol to emit.
149 /// @param Size - The size of the common symbol.
150 /// @param ByteAlignment - The alignment of the common symbol in bytes.
151 void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
152 unsigned ByteAlignment) override;
154 void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
155 uint64_t Size = 0, unsigned ByteAlignment = 0) override;
157 void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
158 unsigned ByteAlignment = 0) override;
160 void EmitBytes(StringRef Data) override;
162 void EmitValueImpl(const MCExpr *Value, unsigned Size,
163 const SMLoc &Loc = SMLoc()) override;
164 void EmitIntValue(uint64_t Value, unsigned Size) override;
166 void EmitULEB128Value(const MCExpr *Value) override;
168 void EmitSLEB128Value(const MCExpr *Value) override;
170 void EmitGPRel64Value(const MCExpr *Value) override;
172 void EmitGPRel32Value(const MCExpr *Value) override;
175 void EmitFill(uint64_t NumBytes, uint8_t FillValue) override;
177 void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
178 unsigned ValueSize = 1,
179 unsigned MaxBytesToEmit = 0) override;
181 void EmitCodeAlignment(unsigned ByteAlignment,
182 unsigned MaxBytesToEmit = 0) override;
184 bool EmitValueToOffset(const MCExpr *Offset,
185 unsigned char Value = 0) override;
187 void EmitFileDirective(StringRef Filename) override;
188 unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
190 unsigned CUID = 0) override;
191 void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
192 unsigned Column, unsigned Flags,
193 unsigned Isa, unsigned Discriminator,
194 StringRef FileName) override;
195 MCSymbol *getDwarfLineTableSymbol(unsigned CUID) override;
197 void EmitIdent(StringRef IdentString) override;
198 void EmitCFISections(bool EH, bool Debug) override;
199 void EmitCFIDefCfa(int64_t Register, int64_t Offset) override;
200 void EmitCFIDefCfaOffset(int64_t Offset) override;
201 void EmitCFIDefCfaRegister(int64_t Register) override;
202 void EmitCFIOffset(int64_t Register, int64_t Offset) override;
203 void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding) override;
204 void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) override;
205 void EmitCFIRememberState() override;
206 void EmitCFIRestoreState() override;
207 void EmitCFISameValue(int64_t Register) override;
208 void EmitCFIRelOffset(int64_t Register, int64_t Offset) override;
209 void EmitCFIAdjustCfaOffset(int64_t Adjustment) override;
210 void EmitCFISignalFrame() override;
211 void EmitCFIUndefined(int64_t Register) override;
212 void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
213 void EmitCFIWindowSave() override;
215 void EmitWinCFIStartProc(const MCSymbol *Symbol) override;
216 void EmitWinCFIEndProc() override;
217 void EmitWinCFIStartChained() override;
218 void EmitWinCFIEndChained() override;
219 void EmitWinCFIPushReg(unsigned Register) override;
220 void EmitWinCFISetFrame(unsigned Register, unsigned Offset) override;
221 void EmitWinCFIAllocStack(unsigned Size) override;
222 void EmitWinCFISaveReg(unsigned Register, unsigned Offset) override;
223 void EmitWinCFISaveXMM(unsigned Register, unsigned Offset) override;
224 void EmitWinCFIPushFrame(bool Code) override;
225 void EmitWinCFIEndProlog() override;
227 void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except) override;
228 void EmitWinEHHandlerData() override;
230 void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
232 void EmitBundleAlignMode(unsigned AlignPow2) override;
233 void EmitBundleLock(bool AlignToEnd) override;
234 void EmitBundleUnlock() override;
236 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
237 /// the specified string in the output .s file. This capability is
238 /// indicated by the hasRawTextSupport() predicate.
239 void EmitRawTextImpl(StringRef String) override;
241 void FinishImpl() override;
244 } // end anonymous namespace.
246 /// AddComment - Add a comment that can be emitted to the generated .s
247 /// file if applicable as a QoI issue to make the output of the compiler
248 /// more readable. This only affects the MCAsmStreamer, and only when
249 /// verbose assembly output is enabled.
250 void MCAsmStreamer::AddComment(const Twine &T) {
251 if (!IsVerboseAsm) return;
253 // Make sure that CommentStream is flushed.
254 CommentStream.flush();
256 T.toVector(CommentToEmit);
257 // Each comment goes on its own line.
258 CommentToEmit.push_back('\n');
260 // Tell the comment stream that the vector changed underneath it.
261 CommentStream.resync();
264 void MCAsmStreamer::EmitCommentsAndEOL() {
265 if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
270 CommentStream.flush();
271 StringRef Comments = CommentToEmit;
273 assert(Comments.back() == '\n' &&
274 "Comment array not newline terminated");
276 // Emit a line of comments.
277 OS.PadToColumn(MAI->getCommentColumn());
278 size_t Position = Comments.find('\n');
279 OS << MAI->getCommentString() << ' ' << Comments.substr(0, Position) <<'\n';
281 Comments = Comments.substr(Position+1);
282 } while (!Comments.empty());
284 CommentToEmit.clear();
285 // Tell the comment stream that the vector changed underneath it.
286 CommentStream.resync();
289 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
290 assert(Bytes && "Invalid size!");
291 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
294 void MCAsmStreamer::emitRawComment(const Twine &T, bool TabPrefix) {
297 OS << MAI->getCommentString() << T;
301 void MCAsmStreamer::ChangeSection(MCSection *Section,
302 const MCExpr *Subsection) {
303 assert(Section && "Cannot switch to a null section!");
304 Section->PrintSwitchToSection(*MAI, OS, Subsection);
307 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
308 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
309 MCStreamer::EmitLabel(Symbol);
311 Symbol->print(OS, MAI);
312 OS << MAI->getLabelSuffix();
317 void MCAsmStreamer::EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {
318 StringRef str = MCLOHIdToName(Kind);
321 int NbArgs = MCLOHIdToNbArgs(Kind);
322 assert(NbArgs != -1 && ((size_t)NbArgs) == Args.size() && "Malformed LOH!");
323 assert(str != "" && "Invalid LOH name");
326 OS << "\t" << MCLOHDirectiveName() << " " << str << "\t";
328 for (MCLOHArgs::const_iterator It = Args.begin(), EndIt = Args.end();
333 (*It)->print(OS, MAI);
338 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
340 case MCAF_SyntaxUnified: OS << "\t.syntax unified"; break;
341 case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
342 case MCAF_Code16: OS << '\t'<< MAI->getCode16Directive();break;
343 case MCAF_Code32: OS << '\t'<< MAI->getCode32Directive();break;
344 case MCAF_Code64: OS << '\t'<< MAI->getCode64Directive();break;
349 void MCAsmStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
350 assert(!Options.empty() && "At least one option is required!");
351 OS << "\t.linker_option \"" << Options[0] << '"';
352 for (ArrayRef<std::string>::iterator it = Options.begin() + 1,
353 ie = Options.end(); it != ie; ++it) {
354 OS << ", " << '"' << *it << '"';
359 void MCAsmStreamer::EmitDataRegion(MCDataRegionType Kind) {
360 if (!MAI->doesSupportDataRegionDirectives())
363 case MCDR_DataRegion: OS << "\t.data_region"; break;
364 case MCDR_DataRegionJT8: OS << "\t.data_region jt8"; break;
365 case MCDR_DataRegionJT16: OS << "\t.data_region jt16"; break;
366 case MCDR_DataRegionJT32: OS << "\t.data_region jt32"; break;
367 case MCDR_DataRegionEnd: OS << "\t.end_data_region"; break;
372 void MCAsmStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
373 unsigned Minor, unsigned Update) {
375 case MCVM_IOSVersionMin: OS << "\t.ios_version_min"; break;
376 case MCVM_OSXVersionMin: OS << "\t.macosx_version_min"; break;
378 OS << " " << Major << ", " << Minor;
380 OS << ", " << Update;
384 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
385 // This needs to emit to a temporary string to get properly quoted
386 // MCSymbols when they have spaces in them.
387 OS << "\t.thumb_func";
388 // Only Mach-O hasSubsectionsViaSymbols()
389 if (MAI->hasSubsectionsViaSymbols()) {
391 Func->print(OS, MAI);
396 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
397 Symbol->print(OS, MAI);
399 Value->print(OS, MAI);
403 MCStreamer::EmitAssignment(Symbol, Value);
406 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
408 Alias->print(OS, MAI);
410 Symbol->print(OS, MAI);
414 bool MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
415 MCSymbolAttr Attribute) {
417 case MCSA_Invalid: llvm_unreachable("Invalid symbol attribute");
418 case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC # aka @function
419 case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
420 case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT # aka @object
421 case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS # aka @tls_object
422 case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON # aka @common
423 case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE # aka @notype
424 case MCSA_ELF_TypeGnuUniqueObject: /// .type _foo, @gnu_unique_object
425 if (!MAI->hasDotTypeDotSizeDirective())
426 return false; // Symbol attribute not supported
428 Symbol->print(OS, MAI);
429 OS << ',' << ((MAI->getCommentString()[0] != '@') ? '@' : '%');
431 default: return false;
432 case MCSA_ELF_TypeFunction: OS << "function"; break;
433 case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
434 case MCSA_ELF_TypeObject: OS << "object"; break;
435 case MCSA_ELF_TypeTLS: OS << "tls_object"; break;
436 case MCSA_ELF_TypeCommon: OS << "common"; break;
437 case MCSA_ELF_TypeNoType: OS << "no_type"; break;
438 case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
442 case MCSA_Global: // .globl/.global
443 OS << MAI->getGlobalDirective();
445 case MCSA_Hidden: OS << "\t.hidden\t"; break;
446 case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
447 case MCSA_Internal: OS << "\t.internal\t"; break;
448 case MCSA_LazyReference: OS << "\t.lazy_reference\t"; break;
449 case MCSA_Local: OS << "\t.local\t"; break;
450 case MCSA_NoDeadStrip:
451 if (!MAI->hasNoDeadStrip())
453 OS << "\t.no_dead_strip\t";
455 case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
456 case MCSA_PrivateExtern:
457 OS << "\t.private_extern\t";
459 case MCSA_Protected: OS << "\t.protected\t"; break;
460 case MCSA_Reference: OS << "\t.reference\t"; break;
461 case MCSA_Weak: OS << MAI->getWeakDirective(); break;
462 case MCSA_WeakDefinition:
463 OS << "\t.weak_definition\t";
466 case MCSA_WeakReference: OS << MAI->getWeakRefDirective(); break;
467 case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
470 Symbol->print(OS, MAI);
476 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
477 OS << ".desc" << ' ';
478 Symbol->print(OS, MAI);
479 OS << ',' << DescValue;
483 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
485 Symbol->print(OS, MAI);
490 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
491 OS << "\t.scl\t" << StorageClass << ';';
495 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
496 OS << "\t.type\t" << Type << ';';
500 void MCAsmStreamer::EndCOFFSymbolDef() {
505 void MCAsmStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
506 OS << "\t.safeseh\t";
507 Symbol->print(OS, MAI);
511 void MCAsmStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
513 Symbol->print(OS, MAI);
517 void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
518 OS << "\t.secrel32\t";
519 Symbol->print(OS, MAI);
523 void MCAsmStreamer::emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) {
524 assert(MAI->hasDotTypeDotSizeDirective());
526 Symbol->print(OS, MAI);
528 Value->print(OS, MAI);
532 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
533 unsigned ByteAlignment) {
534 // Common symbols do not belong to any actual section.
535 AssignSection(Symbol, nullptr);
538 Symbol->print(OS, MAI);
541 if (ByteAlignment != 0) {
542 if (MAI->getCOMMDirectiveAlignmentIsInBytes())
543 OS << ',' << ByteAlignment;
545 OS << ',' << Log2_32(ByteAlignment);
550 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
552 /// @param Symbol - The common symbol to emit.
553 /// @param Size - The size of the common symbol.
554 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
555 unsigned ByteAlign) {
556 // Common symbols do not belong to any actual section.
557 AssignSection(Symbol, nullptr);
560 Symbol->print(OS, MAI);
564 switch (MAI->getLCOMMDirectiveAlignmentType()) {
565 case LCOMM::NoAlignment:
566 llvm_unreachable("alignment not supported on .lcomm!");
567 case LCOMM::ByteAlignment:
568 OS << ',' << ByteAlign;
570 case LCOMM::Log2Alignment:
571 assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
572 OS << ',' << Log2_32(ByteAlign);
579 void MCAsmStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
580 uint64_t Size, unsigned ByteAlignment) {
582 AssignSection(Symbol, Section);
584 // Note: a .zerofill directive does not switch sections.
587 // This is a mach-o specific directive.
588 const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
589 OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
593 Symbol->print(OS, MAI);
595 if (ByteAlignment != 0)
596 OS << ',' << Log2_32(ByteAlignment);
601 // .tbss sym, size, align
602 // This depends that the symbol has already been mangled from the original,
604 void MCAsmStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
605 uint64_t Size, unsigned ByteAlignment) {
606 AssignSection(Symbol, Section);
608 assert(Symbol && "Symbol shouldn't be NULL!");
609 // Instead of using the Section we'll just use the shortcut.
610 // This is a mach-o specific directive and section.
612 Symbol->print(OS, MAI);
615 // Output align if we have it. We default to 1 so don't bother printing
617 if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
622 static inline char toOctal(int X) { return (X&7)+'0'; }
624 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
627 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
628 unsigned char C = Data[i];
629 if (C == '"' || C == '\\') {
630 OS << '\\' << (char)C;
634 if (isprint((unsigned char)C)) {
640 case '\b': OS << "\\b"; break;
641 case '\f': OS << "\\f"; break;
642 case '\n': OS << "\\n"; break;
643 case '\r': OS << "\\r"; break;
644 case '\t': OS << "\\t"; break;
647 OS << toOctal(C >> 6);
648 OS << toOctal(C >> 3);
649 OS << toOctal(C >> 0);
658 void MCAsmStreamer::EmitBytes(StringRef Data) {
659 assert(getCurrentSection().first &&
660 "Cannot emit contents before setting section!");
661 if (Data.empty()) return;
663 if (Data.size() == 1) {
664 OS << MAI->getData8bitsDirective();
665 OS << (unsigned)(unsigned char)Data[0];
670 // If the data ends with 0 and the target supports .asciz, use it, otherwise
672 if (MAI->getAscizDirective() && Data.back() == 0) {
673 OS << MAI->getAscizDirective();
674 Data = Data.substr(0, Data.size()-1);
676 OS << MAI->getAsciiDirective();
679 PrintQuotedString(Data, OS);
683 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
684 EmitValue(MCConstantExpr::create(Value, getContext()), Size);
687 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
689 assert(Size <= 8 && "Invalid size");
690 assert(getCurrentSection().first &&
691 "Cannot emit contents before setting section!");
692 const char *Directive = nullptr;
695 case 1: Directive = MAI->getData8bitsDirective(); break;
696 case 2: Directive = MAI->getData16bitsDirective(); break;
697 case 4: Directive = MAI->getData32bitsDirective(); break;
698 case 8: Directive = MAI->getData64bitsDirective(); break;
703 if (!Value->evaluateAsAbsolute(IntValue))
704 report_fatal_error("Don't know how to emit this value.");
706 // We couldn't handle the requested integer size so we fallback by breaking
707 // the request down into several, smaller, integers. Since sizes greater
708 // than eight are invalid and size equivalent to eight should have been
709 // handled earlier, we use four bytes as our largest piece of granularity.
710 bool IsLittleEndian = MAI->isLittleEndian();
711 for (unsigned Emitted = 0; Emitted != Size;) {
712 unsigned Remaining = Size - Emitted;
713 // The size of our partial emission must be a power of two less than
715 unsigned EmissionSize = PowerOf2Floor(Remaining);
716 if (EmissionSize > 4)
718 // Calculate the byte offset of our partial emission taking into account
719 // the endianness of the target.
720 unsigned ByteOffset =
721 IsLittleEndian ? Emitted : (Remaining - EmissionSize);
722 uint64_t ValueToEmit = IntValue >> (ByteOffset * 8);
723 // We truncate our partial emission to fit within the bounds of the
724 // emission domain. This produces nicer output and silences potential
725 // truncation warnings when round tripping through another assembler.
726 uint64_t Shift = 64 - EmissionSize * 8;
727 assert(Shift < static_cast<uint64_t>(
728 std::numeric_limits<unsigned long long>::digits) &&
729 "undefined behavior");
730 ValueToEmit &= ~0ULL >> Shift;
731 EmitIntValue(ValueToEmit, EmissionSize);
732 Emitted += EmissionSize;
737 assert(Directive && "Invalid size for machine code value!");
739 Value->print(OS, MAI);
743 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
745 if (Value->evaluateAsAbsolute(IntValue)) {
746 EmitULEB128IntValue(IntValue);
750 Value->print(OS, MAI);
754 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
756 if (Value->evaluateAsAbsolute(IntValue)) {
757 EmitSLEB128IntValue(IntValue);
761 Value->print(OS, MAI);
765 void MCAsmStreamer::EmitGPRel64Value(const MCExpr *Value) {
766 assert(MAI->getGPRel64Directive() != nullptr);
767 OS << MAI->getGPRel64Directive();
768 Value->print(OS, MAI);
772 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
773 assert(MAI->getGPRel32Directive() != nullptr);
774 OS << MAI->getGPRel32Directive();
775 Value->print(OS, MAI);
780 /// EmitFill - Emit NumBytes bytes worth of the value specified by
781 /// FillValue. This implements directives such as '.space'.
782 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
783 if (NumBytes == 0) return;
785 if (const char *ZeroDirective = MAI->getZeroDirective()) {
786 OS << ZeroDirective << NumBytes;
788 OS << ',' << (int)FillValue;
793 // Emit a byte at a time.
794 MCStreamer::EmitFill(NumBytes, FillValue);
797 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
799 unsigned MaxBytesToEmit) {
800 // Some assemblers don't support non-power of two alignments, so we always
801 // emit alignments as a power of two if possible.
802 if (isPowerOf2_32(ByteAlignment)) {
805 llvm_unreachable("Invalid size for machine code value!");
816 llvm_unreachable("Unsupported alignment size!");
819 if (MAI->getAlignmentIsInBytes())
822 OS << Log2_32(ByteAlignment);
824 if (Value || MaxBytesToEmit) {
826 OS.write_hex(truncateToSize(Value, ValueSize));
829 OS << ", " << MaxBytesToEmit;
835 // Non-power of two alignment. This is not widely supported by assemblers.
836 // FIXME: Parameterize this based on MAI.
838 default: llvm_unreachable("Invalid size for machine code value!");
839 case 1: OS << ".balign"; break;
840 case 2: OS << ".balignw"; break;
841 case 4: OS << ".balignl"; break;
842 case 8: llvm_unreachable("Unsupported alignment size!");
845 OS << ' ' << ByteAlignment;
846 OS << ", " << truncateToSize(Value, ValueSize);
848 OS << ", " << MaxBytesToEmit;
852 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
853 unsigned MaxBytesToEmit) {
854 // Emit with a text fill value.
855 EmitValueToAlignment(ByteAlignment, MAI->getTextAlignFillValue(),
859 bool MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
860 unsigned char Value) {
861 // FIXME: Verify that Offset is associated with the current section.
863 Offset->print(OS, MAI);
864 OS << ", " << (unsigned)Value;
870 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
871 assert(MAI->hasSingleParameterDotFile());
873 PrintQuotedString(Filename, OS);
877 unsigned MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo,
883 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
884 unsigned NumFiles = Table.getMCDwarfFiles().size();
885 FileNo = Table.getFile(Directory, Filename, FileNo);
888 if (NumFiles == Table.getMCDwarfFiles().size())
891 SmallString<128> FullPathName;
893 if (!UseDwarfDirectory && !Directory.empty()) {
894 if (sys::path::is_absolute(Filename))
897 FullPathName = Directory;
898 sys::path::append(FullPathName, Filename);
900 Filename = FullPathName;
904 OS << "\t.file\t" << FileNo << ' ';
905 if (!Directory.empty()) {
906 PrintQuotedString(Directory, OS);
909 PrintQuotedString(Filename, OS);
915 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
916 unsigned Column, unsigned Flags,
918 unsigned Discriminator,
919 StringRef FileName) {
920 OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
921 if (Flags & DWARF2_FLAG_BASIC_BLOCK)
922 OS << " basic_block";
923 if (Flags & DWARF2_FLAG_PROLOGUE_END)
924 OS << " prologue_end";
925 if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
926 OS << " epilogue_begin";
928 unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
929 if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
932 if (Flags & DWARF2_FLAG_IS_STMT)
939 OS << " isa " << Isa;
941 OS << " discriminator " << Discriminator;
944 OS.PadToColumn(MAI->getCommentColumn());
945 OS << MAI->getCommentString() << ' ' << FileName << ':'
946 << Line << ':' << Column;
949 this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
950 Isa, Discriminator, FileName);
953 MCSymbol *MCAsmStreamer::getDwarfLineTableSymbol(unsigned CUID) {
954 // Always use the zeroth line table, since asm syntax only supports one line
956 return MCStreamer::getDwarfLineTableSymbol(0);
959 void MCAsmStreamer::EmitIdent(StringRef IdentString) {
960 assert(MAI->hasIdentDirective() && ".ident directive not supported");
962 PrintQuotedString(IdentString, OS);
966 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
967 MCStreamer::EmitCFISections(EH, Debug);
968 OS << "\t.cfi_sections ";
972 OS << ", .debug_frame";
974 OS << ".debug_frame";
980 void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
981 OS << "\t.cfi_startproc";
987 void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
988 MCStreamer::EmitCFIEndProcImpl(Frame);
989 OS << "\t.cfi_endproc";
993 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
994 if (!MAI->useDwarfRegNumForCFI()) {
995 const MCRegisterInfo *MRI = getContext().getRegisterInfo();
996 unsigned LLVMRegister = MRI->getLLVMRegNum(Register, true);
997 InstPrinter->printRegName(OS, LLVMRegister);
1003 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
1004 MCStreamer::EmitCFIDefCfa(Register, Offset);
1005 OS << "\t.cfi_def_cfa ";
1006 EmitRegisterName(Register);
1007 OS << ", " << Offset;
1011 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
1012 MCStreamer::EmitCFIDefCfaOffset(Offset);
1013 OS << "\t.cfi_def_cfa_offset " << Offset;
1017 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
1018 MCStreamer::EmitCFIDefCfaRegister(Register);
1019 OS << "\t.cfi_def_cfa_register ";
1020 EmitRegisterName(Register);
1024 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
1025 this->MCStreamer::EmitCFIOffset(Register, Offset);
1026 OS << "\t.cfi_offset ";
1027 EmitRegisterName(Register);
1028 OS << ", " << Offset;
1032 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
1033 unsigned Encoding) {
1034 MCStreamer::EmitCFIPersonality(Sym, Encoding);
1035 OS << "\t.cfi_personality " << Encoding << ", ";
1036 Sym->print(OS, MAI);
1040 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
1041 MCStreamer::EmitCFILsda(Sym, Encoding);
1042 OS << "\t.cfi_lsda " << Encoding << ", ";
1043 Sym->print(OS, MAI);
1047 void MCAsmStreamer::EmitCFIRememberState() {
1048 MCStreamer::EmitCFIRememberState();
1049 OS << "\t.cfi_remember_state";
1053 void MCAsmStreamer::EmitCFIRestoreState() {
1054 MCStreamer::EmitCFIRestoreState();
1055 OS << "\t.cfi_restore_state";
1059 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
1060 MCStreamer::EmitCFISameValue(Register);
1061 OS << "\t.cfi_same_value ";
1062 EmitRegisterName(Register);
1066 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
1067 MCStreamer::EmitCFIRelOffset(Register, Offset);
1068 OS << "\t.cfi_rel_offset ";
1069 EmitRegisterName(Register);
1070 OS << ", " << Offset;
1074 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
1075 MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
1076 OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
1080 void MCAsmStreamer::EmitCFISignalFrame() {
1081 MCStreamer::EmitCFISignalFrame();
1082 OS << "\t.cfi_signal_frame";
1086 void MCAsmStreamer::EmitCFIUndefined(int64_t Register) {
1087 MCStreamer::EmitCFIUndefined(Register);
1088 OS << "\t.cfi_undefined " << Register;
1092 void MCAsmStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
1093 MCStreamer::EmitCFIRegister(Register1, Register2);
1094 OS << "\t.cfi_register " << Register1 << ", " << Register2;
1098 void MCAsmStreamer::EmitCFIWindowSave() {
1099 MCStreamer::EmitCFIWindowSave();
1100 OS << "\t.cfi_window_save";
1104 void MCAsmStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
1105 MCStreamer::EmitWinCFIStartProc(Symbol);
1108 Symbol->print(OS, MAI);
1112 void MCAsmStreamer::EmitWinCFIEndProc() {
1113 MCStreamer::EmitWinCFIEndProc();
1115 OS << "\t.seh_endproc";
1119 void MCAsmStreamer::EmitWinCFIStartChained() {
1120 MCStreamer::EmitWinCFIStartChained();
1122 OS << "\t.seh_startchained";
1126 void MCAsmStreamer::EmitWinCFIEndChained() {
1127 MCStreamer::EmitWinCFIEndChained();
1129 OS << "\t.seh_endchained";
1133 void MCAsmStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
1135 MCStreamer::EmitWinEHHandler(Sym, Unwind, Except);
1137 OS << "\t.seh_handler ";
1138 Sym->print(OS, MAI);
1146 void MCAsmStreamer::EmitWinEHHandlerData() {
1147 MCStreamer::EmitWinEHHandlerData();
1149 // Switch sections. Don't call SwitchSection directly, because that will
1150 // cause the section switch to be visible in the emitted assembly.
1151 // We only do this so the section switch that terminates the handler
1152 // data block is visible.
1153 WinEH::FrameInfo *CurFrame = getCurrentWinFrameInfo();
1155 WinEH::UnwindEmitter::getXDataSection(CurFrame->Function, getContext());
1156 SwitchSectionNoChange(XData);
1158 OS << "\t.seh_handlerdata";
1162 void MCAsmStreamer::EmitWinCFIPushReg(unsigned Register) {
1163 MCStreamer::EmitWinCFIPushReg(Register);
1165 OS << "\t.seh_pushreg " << Register;
1169 void MCAsmStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
1170 MCStreamer::EmitWinCFISetFrame(Register, Offset);
1172 OS << "\t.seh_setframe " << Register << ", " << Offset;
1176 void MCAsmStreamer::EmitWinCFIAllocStack(unsigned Size) {
1177 MCStreamer::EmitWinCFIAllocStack(Size);
1179 OS << "\t.seh_stackalloc " << Size;
1183 void MCAsmStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
1184 MCStreamer::EmitWinCFISaveReg(Register, Offset);
1186 OS << "\t.seh_savereg " << Register << ", " << Offset;
1190 void MCAsmStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
1191 MCStreamer::EmitWinCFISaveXMM(Register, Offset);
1193 OS << "\t.seh_savexmm " << Register << ", " << Offset;
1197 void MCAsmStreamer::EmitWinCFIPushFrame(bool Code) {
1198 MCStreamer::EmitWinCFIPushFrame(Code);
1200 OS << "\t.seh_pushframe";
1206 void MCAsmStreamer::EmitWinCFIEndProlog(void) {
1207 MCStreamer::EmitWinCFIEndProlog();
1209 OS << "\t.seh_endprologue";
1213 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst,
1214 const MCSubtargetInfo &STI) {
1215 raw_ostream &OS = GetCommentOS();
1216 SmallString<256> Code;
1217 SmallVector<MCFixup, 4> Fixups;
1218 raw_svector_ostream VecOS(Code);
1219 Emitter->encodeInstruction(Inst, VecOS, Fixups, STI);
1222 // If we are showing fixups, create symbolic markers in the encoded
1223 // representation. We do this by making a per-bit map to the fixup item index,
1224 // then trying to display it as nicely as possible.
1225 SmallVector<uint8_t, 64> FixupMap;
1226 FixupMap.resize(Code.size() * 8);
1227 for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1230 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1231 MCFixup &F = Fixups[i];
1232 const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1233 for (unsigned j = 0; j != Info.TargetSize; ++j) {
1234 unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1235 assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1236 FixupMap[Index] = 1 + i;
1240 // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1241 // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1242 OS << "encoding: [";
1243 for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1247 // See if all bits are the same map entry.
1248 uint8_t MapEntry = FixupMap[i * 8 + 0];
1249 for (unsigned j = 1; j != 8; ++j) {
1250 if (FixupMap[i * 8 + j] == MapEntry)
1253 MapEntry = uint8_t(~0U);
1257 if (MapEntry != uint8_t(~0U)) {
1258 if (MapEntry == 0) {
1259 OS << format("0x%02x", uint8_t(Code[i]));
1262 // FIXME: Some of the 8 bits require fix up.
1263 OS << format("0x%02x", uint8_t(Code[i])) << '\''
1264 << char('A' + MapEntry - 1) << '\'';
1266 OS << char('A' + MapEntry - 1);
1269 // Otherwise, write out in binary.
1271 for (unsigned j = 8; j--;) {
1272 unsigned Bit = (Code[i] >> j) & 1;
1275 if (MAI->isLittleEndian())
1276 FixupBit = i * 8 + j;
1278 FixupBit = i * 8 + (7-j);
1280 if (uint8_t MapEntry = FixupMap[FixupBit]) {
1281 assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1282 OS << char('A' + MapEntry - 1);
1290 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1291 MCFixup &F = Fixups[i];
1292 const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1293 OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1294 << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1298 void MCAsmStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) {
1299 assert(getCurrentSection().first &&
1300 "Cannot emit contents before setting section!");
1302 // Show the encoding in a comment if we have a code emitter.
1304 AddEncodingComment(Inst, STI);
1306 // Show the MCInst if enabled.
1308 Inst.dump_pretty(GetCommentOS(), InstPrinter.get(), "\n ");
1309 GetCommentOS() << "\n";
1312 if(getTargetStreamer())
1313 getTargetStreamer()->prettyPrintAsm(*InstPrinter, OS, Inst, STI);
1315 InstPrinter->printInst(&Inst, OS, "", STI);
1320 void MCAsmStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
1321 OS << "\t.bundle_align_mode " << AlignPow2;
1325 void MCAsmStreamer::EmitBundleLock(bool AlignToEnd) {
1326 OS << "\t.bundle_lock";
1328 OS << " align_to_end";
1332 void MCAsmStreamer::EmitBundleUnlock() {
1333 OS << "\t.bundle_unlock";
1337 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
1338 /// the specified string in the output .s file. This capability is
1339 /// indicated by the hasRawTextSupport() predicate.
1340 void MCAsmStreamer::EmitRawTextImpl(StringRef String) {
1341 if (!String.empty() && String.back() == '\n')
1342 String = String.substr(0, String.size()-1);
1347 void MCAsmStreamer::FinishImpl() {
1348 // If we are generating dwarf for assembly source files dump out the sections.
1349 if (getContext().getGenDwarfForAssembly())
1350 MCGenDwarfInfo::Emit(this);
1352 // Emit the label for the line table, if requested - since the rest of the
1353 // line table will be defined by .loc/.file directives, and not emitted
1354 // directly, the label is the only work required here.
1355 auto &Tables = getContext().getMCDwarfLineTables();
1356 if (!Tables.empty()) {
1357 assert(Tables.size() == 1 && "asm output only supports one line table");
1358 if (auto *Label = Tables.begin()->second.getLabel()) {
1359 SwitchSection(getContext().getObjectFileInfo()->getDwarfLineSection());
1365 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1366 std::unique_ptr<formatted_raw_ostream> OS,
1367 bool isVerboseAsm, bool useDwarfDirectory,
1368 MCInstPrinter *IP, MCCodeEmitter *CE,
1369 MCAsmBackend *MAB, bool ShowInst) {
1370 return new MCAsmStreamer(Context, std::move(OS), isVerboseAsm,
1371 useDwarfDirectory, IP, CE, MAB, ShowInst);