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/MCSymbol.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 formatted_raw_ostream &OS;
42 std::unique_ptr<MCInstPrinter> InstPrinter;
43 std::unique_ptr<MCCodeEmitter> Emitter;
44 std::unique_ptr<MCAsmBackend> AsmBackend;
46 SmallString<128> CommentToEmit;
47 raw_svector_ostream CommentStream;
49 unsigned IsVerboseAsm : 1;
50 unsigned ShowInst : 1;
51 unsigned UseDwarfDirectory : 1;
53 void EmitRegisterName(int64_t Register);
54 void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override;
55 void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override;
58 MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
59 bool isVerboseAsm, bool useDwarfDirectory,
60 MCInstPrinter *printer, MCCodeEmitter *emitter,
61 MCAsmBackend *asmbackend, bool showInst)
62 : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
63 InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
64 CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
65 ShowInst(showInst), UseDwarfDirectory(useDwarfDirectory) {
66 if (InstPrinter && IsVerboseAsm)
67 InstPrinter->setCommentStream(CommentStream);
70 inline void EmitEOL() {
71 // If we don't have any comments, just emit a \n.
78 void EmitCommentsAndEOL();
80 /// isVerboseAsm - Return true if this streamer supports verbose assembly at
82 bool isVerboseAsm() const override { return IsVerboseAsm; }
84 /// hasRawTextSupport - We support EmitRawText.
85 bool hasRawTextSupport() const override { return true; }
87 /// AddComment - Add a comment that can be emitted to the generated .s
88 /// file if applicable as a QoI issue to make the output of the compiler
89 /// more readable. This only affects the MCAsmStreamer, and only when
90 /// verbose assembly output is enabled.
91 void AddComment(const Twine &T) override;
93 /// AddEncodingComment - Add a comment showing the encoding of an instruction.
94 void AddEncodingComment(const MCInst &Inst, const MCSubtargetInfo &);
96 /// GetCommentOS - Return a raw_ostream that comments can be written to.
97 /// Unlike AddComment, you are required to terminate comments with \n if you
99 raw_ostream &GetCommentOS() override {
101 return nulls(); // Discard comments unless in verbose asm mode.
102 return CommentStream;
105 void emitRawComment(const Twine &T, bool TabPrefix = true) override;
107 /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
108 void AddBlankLine() override {
112 /// @name MCStreamer Interface
115 void ChangeSection(const MCSection *Section,
116 const MCExpr *Subsection) override;
118 void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override;
119 void EmitLabel(MCSymbol *Symbol) override;
121 void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
122 void EmitLinkerOptions(ArrayRef<std::string> Options) override;
123 void EmitDataRegion(MCDataRegionType Kind) override;
124 void EmitVersionMin(MCVersionMinType Kind, unsigned Major, unsigned Minor,
125 unsigned Update) override;
126 void EmitThumbFunc(MCSymbol *Func) override;
128 void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
129 void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
130 bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
132 void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
133 void BeginCOFFSymbolDef(const MCSymbol *Symbol) override;
134 void EmitCOFFSymbolStorageClass(int StorageClass) override;
135 void EmitCOFFSymbolType(int Type) override;
136 void EndCOFFSymbolDef() override;
137 void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
138 void EmitCOFFSecRel32(MCSymbol const *Symbol) override;
139 void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
140 void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
141 unsigned ByteAlignment) override;
143 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
145 /// @param Symbol - The common symbol to emit.
146 /// @param Size - The size of the common symbol.
147 /// @param ByteAlignment - The alignment of the common symbol in bytes.
148 void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
149 unsigned ByteAlignment) override;
151 void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = nullptr,
152 uint64_t Size = 0, unsigned ByteAlignment = 0) override;
154 void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
155 uint64_t Size, unsigned ByteAlignment = 0) override;
157 void EmitBytes(StringRef Data) override;
159 void EmitValueImpl(const MCExpr *Value, unsigned Size,
160 const SMLoc &Loc = SMLoc()) override;
161 void EmitIntValue(uint64_t Value, unsigned Size) override;
163 void EmitULEB128Value(const MCExpr *Value) override;
165 void EmitSLEB128Value(const MCExpr *Value) override;
167 void EmitGPRel64Value(const MCExpr *Value) override;
169 void EmitGPRel32Value(const MCExpr *Value) override;
172 void EmitFill(uint64_t NumBytes, uint8_t FillValue) override;
174 void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
175 unsigned ValueSize = 1,
176 unsigned MaxBytesToEmit = 0) override;
178 void EmitCodeAlignment(unsigned ByteAlignment,
179 unsigned MaxBytesToEmit = 0) override;
181 bool EmitValueToOffset(const MCExpr *Offset,
182 unsigned char Value = 0) override;
184 void EmitFileDirective(StringRef Filename) override;
185 unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
187 unsigned CUID = 0) override;
188 void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
189 unsigned Column, unsigned Flags,
190 unsigned Isa, unsigned Discriminator,
191 StringRef FileName) override;
192 MCSymbol *getDwarfLineTableSymbol(unsigned CUID) override;
194 void EmitIdent(StringRef IdentString) override;
195 void EmitCFISections(bool EH, bool Debug) override;
196 void EmitCFIDefCfa(int64_t Register, int64_t Offset) override;
197 void EmitCFIDefCfaOffset(int64_t Offset) override;
198 void EmitCFIDefCfaRegister(int64_t Register) override;
199 void EmitCFIOffset(int64_t Register, int64_t Offset) override;
200 void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding) override;
201 void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) override;
202 void EmitCFIRememberState() override;
203 void EmitCFIRestoreState() override;
204 void EmitCFISameValue(int64_t Register) override;
205 void EmitCFIRelOffset(int64_t Register, int64_t Offset) override;
206 void EmitCFIAdjustCfaOffset(int64_t Adjustment) override;
207 void EmitCFISignalFrame() override;
208 void EmitCFIUndefined(int64_t Register) override;
209 void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
210 void EmitCFIWindowSave() override;
212 void EmitWinCFIStartProc(const MCSymbol *Symbol) override;
213 void EmitWinCFIEndProc() override;
214 void EmitWinCFIStartChained() override;
215 void EmitWinCFIEndChained() override;
216 void EmitWinCFIPushReg(unsigned Register) override;
217 void EmitWinCFISetFrame(unsigned Register, unsigned Offset) override;
218 void EmitWinCFIAllocStack(unsigned Size) override;
219 void EmitWinCFISaveReg(unsigned Register, unsigned Offset) override;
220 void EmitWinCFISaveXMM(unsigned Register, unsigned Offset) override;
221 void EmitWinCFIPushFrame(bool Code) override;
222 void EmitWinCFIEndProlog() override;
224 void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except) override;
225 void EmitWinEHHandlerData() override;
227 void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
229 void EmitBundleAlignMode(unsigned AlignPow2) override;
230 void EmitBundleLock(bool AlignToEnd) override;
231 void EmitBundleUnlock() override;
233 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
234 /// the specified string in the output .s file. This capability is
235 /// indicated by the hasRawTextSupport() predicate.
236 void EmitRawTextImpl(StringRef String) override;
238 void FinishImpl() override;
241 } // end anonymous namespace.
243 /// AddComment - Add a comment that can be emitted to the generated .s
244 /// file if applicable as a QoI issue to make the output of the compiler
245 /// more readable. This only affects the MCAsmStreamer, and only when
246 /// verbose assembly output is enabled.
247 void MCAsmStreamer::AddComment(const Twine &T) {
248 if (!IsVerboseAsm) return;
250 // Make sure that CommentStream is flushed.
251 CommentStream.flush();
253 T.toVector(CommentToEmit);
254 // Each comment goes on its own line.
255 CommentToEmit.push_back('\n');
257 // Tell the comment stream that the vector changed underneath it.
258 CommentStream.resync();
261 void MCAsmStreamer::EmitCommentsAndEOL() {
262 if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
267 CommentStream.flush();
268 StringRef Comments = CommentToEmit;
270 assert(Comments.back() == '\n' &&
271 "Comment array not newline terminated");
273 // Emit a line of comments.
274 OS.PadToColumn(MAI->getCommentColumn());
275 size_t Position = Comments.find('\n');
276 OS << MAI->getCommentString() << ' ' << Comments.substr(0, Position) <<'\n';
278 Comments = Comments.substr(Position+1);
279 } while (!Comments.empty());
281 CommentToEmit.clear();
282 // Tell the comment stream that the vector changed underneath it.
283 CommentStream.resync();
286 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
287 assert(Bytes && "Invalid size!");
288 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
291 void MCAsmStreamer::emitRawComment(const Twine &T, bool TabPrefix) {
294 OS << MAI->getCommentString() << T;
298 void MCAsmStreamer::ChangeSection(const MCSection *Section,
299 const MCExpr *Subsection) {
300 assert(Section && "Cannot switch to a null section!");
301 Section->PrintSwitchToSection(*MAI, OS, Subsection);
304 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
305 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
306 MCStreamer::EmitLabel(Symbol);
308 OS << *Symbol << MAI->getLabelSuffix();
312 void MCAsmStreamer::EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {
313 StringRef str = MCLOHIdToName(Kind);
316 int NbArgs = MCLOHIdToNbArgs(Kind);
317 assert(NbArgs != -1 && ((size_t)NbArgs) == Args.size() && "Malformed LOH!");
318 assert(str != "" && "Invalid LOH name");
321 OS << "\t" << MCLOHDirectiveName() << " " << str << "\t";
323 for (MCLOHArgs::const_iterator It = Args.begin(), EndIt = Args.end();
333 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
335 case MCAF_SyntaxUnified: OS << "\t.syntax unified"; break;
336 case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
337 case MCAF_Code16: OS << '\t'<< MAI->getCode16Directive();break;
338 case MCAF_Code32: OS << '\t'<< MAI->getCode32Directive();break;
339 case MCAF_Code64: OS << '\t'<< MAI->getCode64Directive();break;
344 void MCAsmStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
345 assert(!Options.empty() && "At least one option is required!");
346 OS << "\t.linker_option \"" << Options[0] << '"';
347 for (ArrayRef<std::string>::iterator it = Options.begin() + 1,
348 ie = Options.end(); it != ie; ++it) {
349 OS << ", " << '"' << *it << '"';
354 void MCAsmStreamer::EmitDataRegion(MCDataRegionType Kind) {
355 if (!MAI->doesSupportDataRegionDirectives())
358 case MCDR_DataRegion: OS << "\t.data_region"; break;
359 case MCDR_DataRegionJT8: OS << "\t.data_region jt8"; break;
360 case MCDR_DataRegionJT16: OS << "\t.data_region jt16"; break;
361 case MCDR_DataRegionJT32: OS << "\t.data_region jt32"; break;
362 case MCDR_DataRegionEnd: OS << "\t.end_data_region"; break;
367 void MCAsmStreamer::EmitVersionMin(MCVersionMinType Kind, unsigned Major,
368 unsigned Minor, unsigned Update) {
370 case MCVM_IOSVersionMin: OS << "\t.ios_version_min"; break;
371 case MCVM_OSXVersionMin: OS << "\t.macosx_version_min"; break;
373 OS << " " << Major << ", " << Minor;
375 OS << ", " << Update;
379 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
380 // This needs to emit to a temporary string to get properly quoted
381 // MCSymbols when they have spaces in them.
382 OS << "\t.thumb_func";
383 // Only Mach-O hasSubsectionsViaSymbols()
384 if (MAI->hasSubsectionsViaSymbols())
389 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
390 OS << *Symbol << " = " << *Value;
393 MCStreamer::EmitAssignment(Symbol, Value);
396 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
397 OS << ".weakref " << *Alias << ", " << *Symbol;
401 bool MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
402 MCSymbolAttr Attribute) {
404 case MCSA_Invalid: llvm_unreachable("Invalid symbol attribute");
405 case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC # aka @function
406 case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
407 case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT # aka @object
408 case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS # aka @tls_object
409 case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON # aka @common
410 case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE # aka @notype
411 case MCSA_ELF_TypeGnuUniqueObject: /// .type _foo, @gnu_unique_object
412 if (!MAI->hasDotTypeDotSizeDirective())
413 return false; // Symbol attribute not supported
414 OS << "\t.type\t" << *Symbol << ','
415 << ((MAI->getCommentString()[0] != '@') ? '@' : '%');
417 default: return false;
418 case MCSA_ELF_TypeFunction: OS << "function"; break;
419 case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
420 case MCSA_ELF_TypeObject: OS << "object"; break;
421 case MCSA_ELF_TypeTLS: OS << "tls_object"; break;
422 case MCSA_ELF_TypeCommon: OS << "common"; break;
423 case MCSA_ELF_TypeNoType: OS << "no_type"; break;
424 case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
428 case MCSA_Global: // .globl/.global
429 OS << MAI->getGlobalDirective();
431 case MCSA_Hidden: OS << "\t.hidden\t"; break;
432 case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
433 case MCSA_Internal: OS << "\t.internal\t"; break;
434 case MCSA_LazyReference: OS << "\t.lazy_reference\t"; break;
435 case MCSA_Local: OS << "\t.local\t"; break;
436 case MCSA_NoDeadStrip:
437 if (!MAI->hasNoDeadStrip())
439 OS << "\t.no_dead_strip\t";
441 case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
442 case MCSA_PrivateExtern:
443 OS << "\t.private_extern\t";
445 case MCSA_Protected: OS << "\t.protected\t"; break;
446 case MCSA_Reference: OS << "\t.reference\t"; break;
447 case MCSA_Weak: OS << MAI->getWeakDirective(); break;
448 case MCSA_WeakDefinition:
449 OS << "\t.weak_definition\t";
452 case MCSA_WeakReference: OS << MAI->getWeakRefDirective(); break;
453 case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
462 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
463 OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
467 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
468 OS << "\t.def\t " << *Symbol << ';';
472 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
473 OS << "\t.scl\t" << StorageClass << ';';
477 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
478 OS << "\t.type\t" << Type << ';';
482 void MCAsmStreamer::EndCOFFSymbolDef() {
487 void MCAsmStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
488 OS << "\t.secidx\t" << *Symbol;
492 void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
493 OS << "\t.secrel32\t" << *Symbol;
497 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
498 assert(MAI->hasDotTypeDotSizeDirective());
499 OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
502 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
503 unsigned ByteAlignment) {
504 // Common symbols do not belong to any actual section.
505 AssignSection(Symbol, nullptr);
507 OS << "\t.comm\t" << *Symbol << ',' << Size;
508 if (ByteAlignment != 0) {
509 if (MAI->getCOMMDirectiveAlignmentIsInBytes())
510 OS << ',' << ByteAlignment;
512 OS << ',' << Log2_32(ByteAlignment);
517 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
519 /// @param Symbol - The common symbol to emit.
520 /// @param Size - The size of the common symbol.
521 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
522 unsigned ByteAlign) {
523 // Common symbols do not belong to any actual section.
524 AssignSection(Symbol, nullptr);
526 OS << "\t.lcomm\t" << *Symbol << ',' << Size;
528 switch (MAI->getLCOMMDirectiveAlignmentType()) {
529 case LCOMM::NoAlignment:
530 llvm_unreachable("alignment not supported on .lcomm!");
531 case LCOMM::ByteAlignment:
532 OS << ',' << ByteAlign;
534 case LCOMM::Log2Alignment:
535 assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
536 OS << ',' << Log2_32(ByteAlign);
543 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
544 uint64_t Size, unsigned ByteAlignment) {
546 AssignSection(Symbol, Section);
548 // Note: a .zerofill directive does not switch sections.
551 // This is a mach-o specific directive.
552 const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
553 OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
556 OS << ',' << *Symbol << ',' << Size;
557 if (ByteAlignment != 0)
558 OS << ',' << Log2_32(ByteAlignment);
563 // .tbss sym, size, align
564 // This depends that the symbol has already been mangled from the original,
566 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
567 uint64_t Size, unsigned ByteAlignment) {
568 AssignSection(Symbol, Section);
570 assert(Symbol && "Symbol shouldn't be NULL!");
571 // Instead of using the Section we'll just use the shortcut.
572 // This is a mach-o specific directive and section.
573 OS << ".tbss " << *Symbol << ", " << Size;
575 // Output align if we have it. We default to 1 so don't bother printing
577 if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
582 static inline char toOctal(int X) { return (X&7)+'0'; }
584 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
587 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
588 unsigned char C = Data[i];
589 if (C == '"' || C == '\\') {
590 OS << '\\' << (char)C;
594 if (isprint((unsigned char)C)) {
600 case '\b': OS << "\\b"; break;
601 case '\f': OS << "\\f"; break;
602 case '\n': OS << "\\n"; break;
603 case '\r': OS << "\\r"; break;
604 case '\t': OS << "\\t"; break;
607 OS << toOctal(C >> 6);
608 OS << toOctal(C >> 3);
609 OS << toOctal(C >> 0);
618 void MCAsmStreamer::EmitBytes(StringRef Data) {
619 assert(getCurrentSection().first &&
620 "Cannot emit contents before setting section!");
621 if (Data.empty()) return;
623 if (Data.size() == 1) {
624 OS << MAI->getData8bitsDirective();
625 OS << (unsigned)(unsigned char)Data[0];
630 // If the data ends with 0 and the target supports .asciz, use it, otherwise
632 if (MAI->getAscizDirective() && Data.back() == 0) {
633 OS << MAI->getAscizDirective();
634 Data = Data.substr(0, Data.size()-1);
636 OS << MAI->getAsciiDirective();
639 PrintQuotedString(Data, OS);
643 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
644 EmitValue(MCConstantExpr::Create(Value, getContext()), Size);
647 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
649 assert(Size <= 8 && "Invalid size");
650 assert(getCurrentSection().first &&
651 "Cannot emit contents before setting section!");
652 const char *Directive = nullptr;
655 case 1: Directive = MAI->getData8bitsDirective(); break;
656 case 2: Directive = MAI->getData16bitsDirective(); break;
657 case 4: Directive = MAI->getData32bitsDirective(); break;
658 case 8: Directive = MAI->getData64bitsDirective(); break;
663 if (!Value->EvaluateAsAbsolute(IntValue))
664 report_fatal_error("Don't know how to emit this value.");
666 // We couldn't handle the requested integer size so we fallback by breaking
667 // the request down into several, smaller, integers. Since sizes greater
668 // than eight are invalid and size equivalent to eight should have been
669 // handled earlier, we use four bytes as our largest piece of granularity.
670 bool IsLittleEndian = MAI->isLittleEndian();
671 for (unsigned Emitted = 0; Emitted != Size;) {
672 unsigned Remaining = Size - Emitted;
673 // The size of our partial emission must be a power of two less than
675 unsigned EmissionSize = PowerOf2Floor(Remaining);
676 if (EmissionSize > 4)
678 // Calculate the byte offset of our partial emission taking into account
679 // the endianness of the target.
680 unsigned ByteOffset =
681 IsLittleEndian ? Emitted : (Remaining - EmissionSize);
682 uint64_t ValueToEmit = IntValue >> (ByteOffset * 8);
683 // We truncate our partial emission to fit within the bounds of the
684 // emission domain. This produces nicer output and silences potential
685 // truncation warnings when round tripping through another assembler.
686 uint64_t Shift = 64 - EmissionSize * 8;
687 assert(Shift < static_cast<uint64_t>(
688 std::numeric_limits<unsigned long long>::digits) &&
689 "undefined behavior");
690 ValueToEmit &= ~0ULL >> Shift;
691 EmitIntValue(ValueToEmit, EmissionSize);
692 Emitted += EmissionSize;
697 assert(Directive && "Invalid size for machine code value!");
698 OS << Directive << *Value;
702 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
704 if (Value->EvaluateAsAbsolute(IntValue)) {
705 EmitULEB128IntValue(IntValue);
708 OS << ".uleb128 " << *Value;
712 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
714 if (Value->EvaluateAsAbsolute(IntValue)) {
715 EmitSLEB128IntValue(IntValue);
718 OS << ".sleb128 " << *Value;
722 void MCAsmStreamer::EmitGPRel64Value(const MCExpr *Value) {
723 assert(MAI->getGPRel64Directive() != nullptr);
724 OS << MAI->getGPRel64Directive() << *Value;
728 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
729 assert(MAI->getGPRel32Directive() != nullptr);
730 OS << MAI->getGPRel32Directive() << *Value;
735 /// EmitFill - Emit NumBytes bytes worth of the value specified by
736 /// FillValue. This implements directives such as '.space'.
737 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
738 if (NumBytes == 0) return;
740 if (const char *ZeroDirective = MAI->getZeroDirective()) {
741 OS << ZeroDirective << NumBytes;
743 OS << ',' << (int)FillValue;
748 // Emit a byte at a time.
749 MCStreamer::EmitFill(NumBytes, FillValue);
752 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
754 unsigned MaxBytesToEmit) {
755 // Some assemblers don't support non-power of two alignments, so we always
756 // emit alignments as a power of two if possible.
757 if (isPowerOf2_32(ByteAlignment)) {
760 llvm_unreachable("Invalid size for machine code value!");
771 llvm_unreachable("Unsupported alignment size!");
774 if (MAI->getAlignmentIsInBytes())
777 OS << Log2_32(ByteAlignment);
779 if (Value || MaxBytesToEmit) {
781 OS.write_hex(truncateToSize(Value, ValueSize));
784 OS << ", " << MaxBytesToEmit;
790 // Non-power of two alignment. This is not widely supported by assemblers.
791 // FIXME: Parameterize this based on MAI.
793 default: llvm_unreachable("Invalid size for machine code value!");
794 case 1: OS << ".balign"; break;
795 case 2: OS << ".balignw"; break;
796 case 4: OS << ".balignl"; break;
797 case 8: llvm_unreachable("Unsupported alignment size!");
800 OS << ' ' << ByteAlignment;
801 OS << ", " << truncateToSize(Value, ValueSize);
803 OS << ", " << MaxBytesToEmit;
807 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
808 unsigned MaxBytesToEmit) {
809 // Emit with a text fill value.
810 EmitValueToAlignment(ByteAlignment, MAI->getTextAlignFillValue(),
814 bool MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
815 unsigned char Value) {
816 // FIXME: Verify that Offset is associated with the current section.
817 OS << ".org " << *Offset << ", " << (unsigned) Value;
823 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
824 assert(MAI->hasSingleParameterDotFile());
826 PrintQuotedString(Filename, OS);
830 unsigned MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo,
836 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
837 unsigned NumFiles = Table.getMCDwarfFiles().size();
838 FileNo = Table.getFile(Directory, Filename, FileNo);
841 if (NumFiles == Table.getMCDwarfFiles().size())
844 SmallString<128> FullPathName;
846 if (!UseDwarfDirectory && !Directory.empty()) {
847 if (sys::path::is_absolute(Filename))
850 FullPathName = Directory;
851 sys::path::append(FullPathName, Filename);
853 Filename = FullPathName;
857 OS << "\t.file\t" << FileNo << ' ';
858 if (!Directory.empty()) {
859 PrintQuotedString(Directory, OS);
862 PrintQuotedString(Filename, OS);
868 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
869 unsigned Column, unsigned Flags,
871 unsigned Discriminator,
872 StringRef FileName) {
873 OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
874 if (Flags & DWARF2_FLAG_BASIC_BLOCK)
875 OS << " basic_block";
876 if (Flags & DWARF2_FLAG_PROLOGUE_END)
877 OS << " prologue_end";
878 if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
879 OS << " epilogue_begin";
881 unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
882 if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
885 if (Flags & DWARF2_FLAG_IS_STMT)
892 OS << " isa " << Isa;
894 OS << " discriminator " << Discriminator;
897 OS.PadToColumn(MAI->getCommentColumn());
898 OS << MAI->getCommentString() << ' ' << FileName << ':'
899 << Line << ':' << Column;
902 this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
903 Isa, Discriminator, FileName);
906 MCSymbol *MCAsmStreamer::getDwarfLineTableSymbol(unsigned CUID) {
907 // Always use the zeroth line table, since asm syntax only supports one line
909 return MCStreamer::getDwarfLineTableSymbol(0);
912 void MCAsmStreamer::EmitIdent(StringRef IdentString) {
913 assert(MAI->hasIdentDirective() && ".ident directive not supported");
915 PrintQuotedString(IdentString, OS);
919 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
920 MCStreamer::EmitCFISections(EH, Debug);
921 OS << "\t.cfi_sections ";
925 OS << ", .debug_frame";
927 OS << ".debug_frame";
933 void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
934 OS << "\t.cfi_startproc";
940 void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
941 MCStreamer::EmitCFIEndProcImpl(Frame);
942 OS << "\t.cfi_endproc";
946 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
947 if (InstPrinter && !MAI->useDwarfRegNumForCFI()) {
948 const MCRegisterInfo *MRI = getContext().getRegisterInfo();
949 unsigned LLVMRegister = MRI->getLLVMRegNum(Register, true);
950 InstPrinter->printRegName(OS, LLVMRegister);
956 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
957 MCStreamer::EmitCFIDefCfa(Register, Offset);
958 OS << "\t.cfi_def_cfa ";
959 EmitRegisterName(Register);
960 OS << ", " << Offset;
964 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
965 MCStreamer::EmitCFIDefCfaOffset(Offset);
966 OS << "\t.cfi_def_cfa_offset " << Offset;
970 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
971 MCStreamer::EmitCFIDefCfaRegister(Register);
972 OS << "\t.cfi_def_cfa_register ";
973 EmitRegisterName(Register);
977 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
978 this->MCStreamer::EmitCFIOffset(Register, Offset);
979 OS << "\t.cfi_offset ";
980 EmitRegisterName(Register);
981 OS << ", " << Offset;
985 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
987 MCStreamer::EmitCFIPersonality(Sym, Encoding);
988 OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
992 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
993 MCStreamer::EmitCFILsda(Sym, Encoding);
994 OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
998 void MCAsmStreamer::EmitCFIRememberState() {
999 MCStreamer::EmitCFIRememberState();
1000 OS << "\t.cfi_remember_state";
1004 void MCAsmStreamer::EmitCFIRestoreState() {
1005 MCStreamer::EmitCFIRestoreState();
1006 OS << "\t.cfi_restore_state";
1010 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
1011 MCStreamer::EmitCFISameValue(Register);
1012 OS << "\t.cfi_same_value ";
1013 EmitRegisterName(Register);
1017 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
1018 MCStreamer::EmitCFIRelOffset(Register, Offset);
1019 OS << "\t.cfi_rel_offset ";
1020 EmitRegisterName(Register);
1021 OS << ", " << Offset;
1025 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
1026 MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
1027 OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
1031 void MCAsmStreamer::EmitCFISignalFrame() {
1032 MCStreamer::EmitCFISignalFrame();
1033 OS << "\t.cfi_signal_frame";
1037 void MCAsmStreamer::EmitCFIUndefined(int64_t Register) {
1038 MCStreamer::EmitCFIUndefined(Register);
1039 OS << "\t.cfi_undefined " << Register;
1043 void MCAsmStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
1044 MCStreamer::EmitCFIRegister(Register1, Register2);
1045 OS << "\t.cfi_register " << Register1 << ", " << Register2;
1049 void MCAsmStreamer::EmitCFIWindowSave() {
1050 MCStreamer::EmitCFIWindowSave();
1051 OS << "\t.cfi_window_save";
1055 void MCAsmStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
1056 MCStreamer::EmitWinCFIStartProc(Symbol);
1058 OS << ".seh_proc " << *Symbol;
1062 void MCAsmStreamer::EmitWinCFIEndProc() {
1063 MCStreamer::EmitWinCFIEndProc();
1065 OS << "\t.seh_endproc";
1069 void MCAsmStreamer::EmitWinCFIStartChained() {
1070 MCStreamer::EmitWinCFIStartChained();
1072 OS << "\t.seh_startchained";
1076 void MCAsmStreamer::EmitWinCFIEndChained() {
1077 MCStreamer::EmitWinCFIEndChained();
1079 OS << "\t.seh_endchained";
1083 void MCAsmStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
1085 MCStreamer::EmitWinEHHandler(Sym, Unwind, Except);
1087 OS << "\t.seh_handler " << *Sym;
1095 void MCAsmStreamer::EmitWinEHHandlerData() {
1096 MCStreamer::EmitWinEHHandlerData();
1098 // Switch sections. Don't call SwitchSection directly, because that will
1099 // cause the section switch to be visible in the emitted assembly.
1100 // We only do this so the section switch that terminates the handler
1101 // data block is visible.
1102 WinEH::FrameInfo *CurFrame = getCurrentWinFrameInfo();
1103 if (const MCSection *XData = WinEH::UnwindEmitter::getXDataSection(
1104 CurFrame->Function, getContext()))
1105 SwitchSectionNoChange(XData);
1107 OS << "\t.seh_handlerdata";
1111 void MCAsmStreamer::EmitWinCFIPushReg(unsigned Register) {
1112 MCStreamer::EmitWinCFIPushReg(Register);
1114 OS << "\t.seh_pushreg " << Register;
1118 void MCAsmStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
1119 MCStreamer::EmitWinCFISetFrame(Register, Offset);
1121 OS << "\t.seh_setframe " << Register << ", " << Offset;
1125 void MCAsmStreamer::EmitWinCFIAllocStack(unsigned Size) {
1126 MCStreamer::EmitWinCFIAllocStack(Size);
1128 OS << "\t.seh_stackalloc " << Size;
1132 void MCAsmStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
1133 MCStreamer::EmitWinCFISaveReg(Register, Offset);
1135 OS << "\t.seh_savereg " << Register << ", " << Offset;
1139 void MCAsmStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
1140 MCStreamer::EmitWinCFISaveXMM(Register, Offset);
1142 OS << "\t.seh_savexmm " << Register << ", " << Offset;
1146 void MCAsmStreamer::EmitWinCFIPushFrame(bool Code) {
1147 MCStreamer::EmitWinCFIPushFrame(Code);
1149 OS << "\t.seh_pushframe";
1155 void MCAsmStreamer::EmitWinCFIEndProlog(void) {
1156 MCStreamer::EmitWinCFIEndProlog();
1158 OS << "\t.seh_endprologue";
1162 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst,
1163 const MCSubtargetInfo &STI) {
1164 raw_ostream &OS = GetCommentOS();
1165 SmallString<256> Code;
1166 SmallVector<MCFixup, 4> Fixups;
1167 raw_svector_ostream VecOS(Code);
1168 Emitter->EncodeInstruction(Inst, VecOS, Fixups, STI);
1171 // If we are showing fixups, create symbolic markers in the encoded
1172 // representation. We do this by making a per-bit map to the fixup item index,
1173 // then trying to display it as nicely as possible.
1174 SmallVector<uint8_t, 64> FixupMap;
1175 FixupMap.resize(Code.size() * 8);
1176 for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1179 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1180 MCFixup &F = Fixups[i];
1181 const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1182 for (unsigned j = 0; j != Info.TargetSize; ++j) {
1183 unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1184 assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1185 FixupMap[Index] = 1 + i;
1189 // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1190 // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1191 OS << "encoding: [";
1192 for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1196 // See if all bits are the same map entry.
1197 uint8_t MapEntry = FixupMap[i * 8 + 0];
1198 for (unsigned j = 1; j != 8; ++j) {
1199 if (FixupMap[i * 8 + j] == MapEntry)
1202 MapEntry = uint8_t(~0U);
1206 if (MapEntry != uint8_t(~0U)) {
1207 if (MapEntry == 0) {
1208 OS << format("0x%02x", uint8_t(Code[i]));
1211 // FIXME: Some of the 8 bits require fix up.
1212 OS << format("0x%02x", uint8_t(Code[i])) << '\''
1213 << char('A' + MapEntry - 1) << '\'';
1215 OS << char('A' + MapEntry - 1);
1218 // Otherwise, write out in binary.
1220 for (unsigned j = 8; j--;) {
1221 unsigned Bit = (Code[i] >> j) & 1;
1224 if (MAI->isLittleEndian())
1225 FixupBit = i * 8 + j;
1227 FixupBit = i * 8 + (7-j);
1229 if (uint8_t MapEntry = FixupMap[FixupBit]) {
1230 assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1231 OS << char('A' + MapEntry - 1);
1239 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1240 MCFixup &F = Fixups[i];
1241 const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1242 OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1243 << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1247 void MCAsmStreamer::EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) {
1248 assert(getCurrentSection().first &&
1249 "Cannot emit contents before setting section!");
1251 // Show the encoding in a comment if we have a code emitter.
1253 AddEncodingComment(Inst, STI);
1255 // Show the MCInst if enabled.
1257 Inst.dump_pretty(GetCommentOS(), InstPrinter.get(), "\n ");
1258 GetCommentOS() << "\n";
1261 // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1263 InstPrinter->printInst(&Inst, OS, "", STI);
1269 void MCAsmStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
1270 OS << "\t.bundle_align_mode " << AlignPow2;
1274 void MCAsmStreamer::EmitBundleLock(bool AlignToEnd) {
1275 OS << "\t.bundle_lock";
1277 OS << " align_to_end";
1281 void MCAsmStreamer::EmitBundleUnlock() {
1282 OS << "\t.bundle_unlock";
1286 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
1287 /// the specified string in the output .s file. This capability is
1288 /// indicated by the hasRawTextSupport() predicate.
1289 void MCAsmStreamer::EmitRawTextImpl(StringRef String) {
1290 if (!String.empty() && String.back() == '\n')
1291 String = String.substr(0, String.size()-1);
1296 void MCAsmStreamer::FinishImpl() {
1297 // If we are generating dwarf for assembly source files dump out the sections.
1298 if (getContext().getGenDwarfForAssembly())
1299 MCGenDwarfInfo::Emit(this);
1301 // Emit the label for the line table, if requested - since the rest of the
1302 // line table will be defined by .loc/.file directives, and not emitted
1303 // directly, the label is the only work required here.
1304 auto &Tables = getContext().getMCDwarfLineTables();
1305 if (!Tables.empty()) {
1306 assert(Tables.size() == 1 && "asm output only supports one line table");
1307 if (auto *Label = Tables.begin()->second.getLabel()) {
1308 SwitchSection(getContext().getObjectFileInfo()->getDwarfLineSection());
1314 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1315 formatted_raw_ostream &OS,
1316 bool isVerboseAsm, bool useDwarfDirectory,
1317 MCInstPrinter *IP, MCCodeEmitter *CE,
1318 MCAsmBackend *MAB, bool ShowInst) {
1319 return new MCAsmStreamer(Context, OS, isVerboseAsm, useDwarfDirectory, IP, CE,