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/MC/MCAsmInfo.h"
12 #include "llvm/MC/MCCodeEmitter.h"
13 #include "llvm/MC/MCContext.h"
14 #include "llvm/MC/MCExpr.h"
15 #include "llvm/MC/MCFixupKindInfo.h"
16 #include "llvm/MC/MCInst.h"
17 #include "llvm/MC/MCInstPrinter.h"
18 #include "llvm/MC/MCSectionMachO.h"
19 #include "llvm/MC/MCSymbol.h"
20 #include "llvm/ADT/OwningPtr.h"
21 #include "llvm/ADT/SmallString.h"
22 #include "llvm/ADT/Twine.h"
23 #include "llvm/Support/ErrorHandling.h"
24 #include "llvm/Support/MathExtras.h"
25 #include "llvm/Support/Format.h"
26 #include "llvm/Support/FormattedStream.h"
27 #include "llvm/Target/TargetAsmBackend.h"
28 #include "llvm/Target/TargetAsmInfo.h"
29 #include "llvm/Target/TargetLoweringObjectFile.h"
35 class MCAsmStreamer : public MCStreamer {
36 formatted_raw_ostream &OS;
38 OwningPtr<MCInstPrinter> InstPrinter;
39 OwningPtr<MCCodeEmitter> Emitter;
40 OwningPtr<TargetAsmBackend> AsmBackend;
42 SmallString<128> CommentToEmit;
43 raw_svector_ostream CommentStream;
45 unsigned IsVerboseAsm : 1;
46 unsigned ShowInst : 1;
50 bool needsSet(const MCExpr *Value);
53 MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
54 bool isVerboseAsm, bool useLoc, bool useCFI,
55 MCInstPrinter *printer, MCCodeEmitter *emitter,
56 TargetAsmBackend *asmbackend,
58 : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
59 InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
60 CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
61 ShowInst(showInst), UseLoc(useLoc), UseCFI(useCFI) {
62 if (InstPrinter && IsVerboseAsm)
63 InstPrinter->setCommentStream(CommentStream);
67 inline void EmitEOL() {
68 // If we don't have any comments, just emit a \n.
75 void EmitCommentsAndEOL();
77 /// isVerboseAsm - Return true if this streamer supports verbose assembly at
79 virtual bool isVerboseAsm() const { return IsVerboseAsm; }
81 /// hasRawTextSupport - We support EmitRawText.
82 virtual bool hasRawTextSupport() const { return true; }
84 /// AddComment - Add a comment that can be emitted to the generated .s
85 /// file if applicable as a QoI issue to make the output of the compiler
86 /// more readable. This only affects the MCAsmStreamer, and only when
87 /// verbose assembly output is enabled.
88 virtual void AddComment(const Twine &T);
90 /// AddEncodingComment - Add a comment showing the encoding of an instruction.
91 virtual void AddEncodingComment(const MCInst &Inst);
93 /// GetCommentOS - Return a raw_ostream that comments can be written to.
94 /// Unlike AddComment, you are required to terminate comments with \n if you
96 virtual raw_ostream &GetCommentOS() {
98 return nulls(); // Discard comments unless in verbose asm mode.
102 /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
103 virtual void AddBlankLine() {
107 /// @name MCStreamer Interface
110 virtual void ChangeSection(const MCSection *Section);
112 virtual void InitSections() {
113 // FIXME, this is MachO specific, but the testsuite
115 SwitchSection(getContext().getMachOSection("__TEXT", "__text",
116 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
117 0, SectionKind::getText()));
120 virtual void EmitLabel(MCSymbol *Symbol);
122 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
123 virtual void EmitThumbFunc(MCSymbol *Func);
125 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
126 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
127 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
128 const MCSymbol *LastLabel,
129 const MCSymbol *Label);
130 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
131 const MCSymbol *Label);
133 virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
135 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
136 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
137 virtual void EmitCOFFSymbolStorageClass(int StorageClass);
138 virtual void EmitCOFFSymbolType(int Type);
139 virtual void EndCOFFSymbolDef();
140 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
141 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
142 unsigned ByteAlignment);
144 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
146 /// @param Symbol - The common symbol to emit.
147 /// @param Size - The size of the common symbol.
148 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
150 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
151 unsigned Size = 0, unsigned ByteAlignment = 0);
153 virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
154 uint64_t Size, unsigned ByteAlignment = 0);
156 virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
158 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
159 bool isPCRel, unsigned AddrSpace);
160 virtual void EmitIntValue(uint64_t Value, unsigned Size,
161 unsigned AddrSpace = 0);
163 virtual void EmitULEB128Value(const MCExpr *Value);
165 virtual void EmitSLEB128Value(const MCExpr *Value);
167 virtual void EmitGPRel32Value(const MCExpr *Value);
170 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
173 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
174 unsigned ValueSize = 1,
175 unsigned MaxBytesToEmit = 0);
177 virtual void EmitCodeAlignment(unsigned ByteAlignment,
178 unsigned MaxBytesToEmit = 0);
180 virtual void EmitValueToOffset(const MCExpr *Offset,
181 unsigned char Value = 0);
183 virtual void EmitFileDirective(StringRef Filename);
184 virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
185 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
186 unsigned Column, unsigned Flags,
187 unsigned Isa, unsigned Discriminator,
190 virtual void EmitCFIStartProc();
191 virtual void EmitCFIEndProc();
192 virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
193 virtual void EmitCFIDefCfaOffset(int64_t Offset);
194 virtual void EmitCFIDefCfaRegister(int64_t Register);
195 virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
196 virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
197 virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
198 virtual void EmitCFIRememberState();
199 virtual void EmitCFIRestoreState();
200 virtual void EmitCFISameValue(int64_t Register);
201 virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
202 virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
204 virtual void EmitFnStart();
205 virtual void EmitFnEnd();
206 virtual void EmitCantUnwind();
207 virtual void EmitPersonality(const MCSymbol *Personality);
208 virtual void EmitHandlerData();
209 virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
210 virtual void EmitPad(int64_t Offset);
211 virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
214 virtual void EmitInstruction(const MCInst &Inst);
216 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
217 /// the specified string in the output .s file. This capability is
218 /// indicated by the hasRawTextSupport() predicate.
219 virtual void EmitRawText(StringRef String);
221 virtual void Finish();
226 } // end anonymous namespace.
228 /// AddComment - Add a comment that can be emitted to the generated .s
229 /// file if applicable as a QoI issue to make the output of the compiler
230 /// more readable. This only affects the MCAsmStreamer, and only when
231 /// verbose assembly output is enabled.
232 void MCAsmStreamer::AddComment(const Twine &T) {
233 if (!IsVerboseAsm) return;
235 // Make sure that CommentStream is flushed.
236 CommentStream.flush();
238 T.toVector(CommentToEmit);
239 // Each comment goes on its own line.
240 CommentToEmit.push_back('\n');
242 // Tell the comment stream that the vector changed underneath it.
243 CommentStream.resync();
246 void MCAsmStreamer::EmitCommentsAndEOL() {
247 if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
252 CommentStream.flush();
253 StringRef Comments = CommentToEmit.str();
255 assert(Comments.back() == '\n' &&
256 "Comment array not newline terminated");
258 // Emit a line of comments.
259 OS.PadToColumn(MAI.getCommentColumn());
260 size_t Position = Comments.find('\n');
261 OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
263 Comments = Comments.substr(Position+1);
264 } while (!Comments.empty());
266 CommentToEmit.clear();
267 // Tell the comment stream that the vector changed underneath it.
268 CommentStream.resync();
271 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
272 assert(Bytes && "Invalid size!");
273 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
276 void MCAsmStreamer::ChangeSection(const MCSection *Section) {
277 assert(Section && "Cannot switch to a null section!");
278 Section->PrintSwitchToSection(MAI, OS);
281 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
282 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
283 MCStreamer::EmitLabel(Symbol);
285 OS << *Symbol << MAI.getLabelSuffix();
289 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
291 default: assert(0 && "Invalid flag!");
292 case MCAF_SyntaxUnified: OS << "\t.syntax unified"; break;
293 case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
294 case MCAF_Code16: OS << "\t.code\t16"; break;
295 case MCAF_Code32: OS << "\t.code\t32"; break;
300 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
301 // This needs to emit to a temporary string to get properly quoted
302 // MCSymbols when they have spaces in them.
303 OS << "\t.thumb_func";
309 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
310 OS << *Symbol << " = " << *Value;
313 // FIXME: Lift context changes into super class.
314 Symbol->setVariableValue(Value);
317 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
318 OS << ".weakref " << *Alias << ", " << *Symbol;
322 void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
323 const MCSymbol *LastLabel,
324 const MCSymbol *Label) {
325 EmitDwarfSetLineAddr(LineDelta, Label,
326 getContext().getTargetAsmInfo().getPointerSize());
329 void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
330 const MCSymbol *Label) {
331 EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
332 const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
333 AddrDelta = ForceExpAbs(this, getContext(), AddrDelta);
334 EmitValue(AddrDelta, 4);
338 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
339 MCSymbolAttr Attribute) {
341 case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
342 case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC # aka @function
343 case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
344 case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT # aka @object
345 case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS # aka @tls_object
346 case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON # aka @common
347 case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE # aka @notype
348 case MCSA_ELF_TypeGnuUniqueObject: /// .type _foo, @gnu_unique_object
349 assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
350 OS << "\t.type\t" << *Symbol << ','
351 << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
353 default: assert(0 && "Unknown ELF .type");
354 case MCSA_ELF_TypeFunction: OS << "function"; break;
355 case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
356 case MCSA_ELF_TypeObject: OS << "object"; break;
357 case MCSA_ELF_TypeTLS: OS << "tls_object"; break;
358 case MCSA_ELF_TypeCommon: OS << "common"; break;
359 case MCSA_ELF_TypeNoType: OS << "no_type"; break;
360 case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
364 case MCSA_Global: // .globl/.global
365 OS << MAI.getGlobalDirective();
367 case MCSA_Hidden: OS << "\t.hidden\t"; break;
368 case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
369 case MCSA_Internal: OS << "\t.internal\t"; break;
370 case MCSA_LazyReference: OS << "\t.lazy_reference\t"; break;
371 case MCSA_Local: OS << "\t.local\t"; break;
372 case MCSA_NoDeadStrip: OS << "\t.no_dead_strip\t"; break;
373 case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
374 case MCSA_PrivateExtern: OS << "\t.private_extern\t"; break;
375 case MCSA_Protected: OS << "\t.protected\t"; break;
376 case MCSA_Reference: OS << "\t.reference\t"; break;
377 case MCSA_Weak: OS << "\t.weak\t"; break;
378 case MCSA_WeakDefinition: OS << "\t.weak_definition\t"; break;
380 case MCSA_WeakReference: OS << MAI.getWeakRefDirective(); break;
381 case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
388 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
389 OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
393 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
394 OS << "\t.def\t " << *Symbol << ';';
398 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
399 OS << "\t.scl\t" << StorageClass << ';';
403 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
404 OS << "\t.type\t" << Type << ';';
408 void MCAsmStreamer::EndCOFFSymbolDef() {
413 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
414 assert(MAI.hasDotTypeDotSizeDirective());
415 OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
418 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
419 unsigned ByteAlignment) {
420 OS << "\t.comm\t" << *Symbol << ',' << Size;
421 if (ByteAlignment != 0) {
422 if (MAI.getCOMMDirectiveAlignmentIsInBytes())
423 OS << ',' << ByteAlignment;
425 OS << ',' << Log2_32(ByteAlignment);
430 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
432 /// @param Symbol - The common symbol to emit.
433 /// @param Size - The size of the common symbol.
434 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
435 assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
436 OS << "\t.lcomm\t" << *Symbol << ',' << Size;
440 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
441 unsigned Size, unsigned ByteAlignment) {
442 // Note: a .zerofill directive does not switch sections.
445 // This is a mach-o specific directive.
446 const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
447 OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
449 if (Symbol != NULL) {
450 OS << ',' << *Symbol << ',' << Size;
451 if (ByteAlignment != 0)
452 OS << ',' << Log2_32(ByteAlignment);
457 // .tbss sym, size, align
458 // This depends that the symbol has already been mangled from the original,
460 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
461 uint64_t Size, unsigned ByteAlignment) {
462 assert(Symbol != NULL && "Symbol shouldn't be NULL!");
463 // Instead of using the Section we'll just use the shortcut.
464 // This is a mach-o specific directive and section.
465 OS << ".tbss " << *Symbol << ", " << Size;
467 // Output align if we have it. We default to 1 so don't bother printing
469 if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
474 static inline char toOctal(int X) { return (X&7)+'0'; }
476 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
479 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
480 unsigned char C = Data[i];
481 if (C == '"' || C == '\\') {
482 OS << '\\' << (char)C;
486 if (isprint((unsigned char)C)) {
492 case '\b': OS << "\\b"; break;
493 case '\f': OS << "\\f"; break;
494 case '\n': OS << "\\n"; break;
495 case '\r': OS << "\\r"; break;
496 case '\t': OS << "\\t"; break;
499 OS << toOctal(C >> 6);
500 OS << toOctal(C >> 3);
501 OS << toOctal(C >> 0);
510 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
511 assert(getCurrentSection() && "Cannot emit contents before setting section!");
512 if (Data.empty()) return;
514 if (Data.size() == 1) {
515 OS << MAI.getData8bitsDirective(AddrSpace);
516 OS << (unsigned)(unsigned char)Data[0];
521 // If the data ends with 0 and the target supports .asciz, use it, otherwise
523 if (MAI.getAscizDirective() && Data.back() == 0) {
524 OS << MAI.getAscizDirective();
525 Data = Data.substr(0, Data.size()-1);
527 OS << MAI.getAsciiDirective();
531 PrintQuotedString(Data, OS);
535 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
536 unsigned AddrSpace) {
537 EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
540 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
541 bool isPCRel, unsigned AddrSpace) {
542 assert(getCurrentSection() && "Cannot emit contents before setting section!");
543 assert(!isPCRel && "Cannot emit pc relative relocations!");
544 const char *Directive = 0;
547 case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
548 case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
549 case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
551 Directive = MAI.getData64bitsDirective(AddrSpace);
552 // If the target doesn't support 64-bit data, emit as two 32-bit halves.
553 if (Directive) break;
555 if (!Value->EvaluateAsAbsolute(IntValue))
556 report_fatal_error("Don't know how to emit this value.");
557 if (getContext().getTargetAsmInfo().isLittleEndian()) {
558 EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
559 EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
561 EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
562 EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
567 assert(Directive && "Invalid size for machine code value!");
568 OS << Directive << *Value;
572 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
574 if (Value->EvaluateAsAbsolute(IntValue)) {
575 EmitULEB128IntValue(IntValue);
578 assert(MAI.hasLEB128() && "Cannot print a .uleb");
579 OS << ".uleb128 " << *Value;
583 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
585 if (Value->EvaluateAsAbsolute(IntValue)) {
586 EmitSLEB128IntValue(IntValue);
589 assert(MAI.hasLEB128() && "Cannot print a .sleb");
590 OS << ".sleb128 " << *Value;
594 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
595 assert(MAI.getGPRel32Directive() != 0);
596 OS << MAI.getGPRel32Directive() << *Value;
601 /// EmitFill - Emit NumBytes bytes worth of the value specified by
602 /// FillValue. This implements directives such as '.space'.
603 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
604 unsigned AddrSpace) {
605 if (NumBytes == 0) return;
608 if (const char *ZeroDirective = MAI.getZeroDirective()) {
609 OS << ZeroDirective << NumBytes;
611 OS << ',' << (int)FillValue;
616 // Emit a byte at a time.
617 MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
620 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
622 unsigned MaxBytesToEmit) {
623 // Some assemblers don't support non-power of two alignments, so we always
624 // emit alignments as a power of two if possible.
625 if (isPowerOf2_32(ByteAlignment)) {
627 default: llvm_unreachable("Invalid size for machine code value!");
628 case 1: OS << MAI.getAlignDirective(); break;
629 // FIXME: use MAI for this!
630 case 2: OS << ".p2alignw "; break;
631 case 4: OS << ".p2alignl "; break;
632 case 8: llvm_unreachable("Unsupported alignment size!");
635 if (MAI.getAlignmentIsInBytes())
638 OS << Log2_32(ByteAlignment);
640 if (Value || MaxBytesToEmit) {
642 OS.write_hex(truncateToSize(Value, ValueSize));
645 OS << ", " << MaxBytesToEmit;
651 // Non-power of two alignment. This is not widely supported by assemblers.
652 // FIXME: Parameterize this based on MAI.
654 default: llvm_unreachable("Invalid size for machine code value!");
655 case 1: OS << ".balign"; break;
656 case 2: OS << ".balignw"; break;
657 case 4: OS << ".balignl"; break;
658 case 8: llvm_unreachable("Unsupported alignment size!");
661 OS << ' ' << ByteAlignment;
662 OS << ", " << truncateToSize(Value, ValueSize);
664 OS << ", " << MaxBytesToEmit;
668 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
669 unsigned MaxBytesToEmit) {
670 // Emit with a text fill value.
671 EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
675 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
676 unsigned char Value) {
677 // FIXME: Verify that Offset is associated with the current section.
678 OS << ".org " << *Offset << ", " << (unsigned) Value;
683 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
684 assert(MAI.hasSingleParameterDotFile());
686 PrintQuotedString(Filename, OS);
690 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
692 OS << "\t.file\t" << FileNo << ' ';
693 PrintQuotedString(Filename, OS);
696 return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
699 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
700 unsigned Column, unsigned Flags,
702 unsigned Discriminator,
703 StringRef FileName) {
704 this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
705 Isa, Discriminator, FileName);
709 OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
710 if (Flags & DWARF2_FLAG_BASIC_BLOCK)
711 OS << " basic_block";
712 if (Flags & DWARF2_FLAG_PROLOGUE_END)
713 OS << " prologue_end";
714 if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
715 OS << " epilogue_begin";
717 unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
718 if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
721 if (Flags & DWARF2_FLAG_IS_STMT)
730 OS << "discriminator " << Discriminator;
733 OS.PadToColumn(MAI.getCommentColumn());
734 OS << MAI.getCommentString() << ' ' << FileName << ':'
735 << Line << ':' << Column;
740 void MCAsmStreamer::EmitCFIStartProc() {
741 MCStreamer::EmitCFIStartProc();
746 OS << "\t.cfi_startproc";
750 void MCAsmStreamer::EmitCFIEndProc() {
751 MCStreamer::EmitCFIEndProc();
756 OS << "\t.cfi_endproc";
760 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
761 MCStreamer::EmitCFIDefCfa(Register, Offset);
766 OS << ".cfi_def_cfa " << Register << ", " << Offset;
770 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
771 MCStreamer::EmitCFIDefCfaOffset(Offset);
776 OS << "\t.cfi_def_cfa_offset " << Offset;
780 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
781 MCStreamer::EmitCFIDefCfaRegister(Register);
786 OS << "\t.cfi_def_cfa_register " << Register;
790 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
791 this->MCStreamer::EmitCFIOffset(Register, Offset);
796 OS << "\t.cfi_offset " << Register << ", " << Offset;
800 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
802 MCStreamer::EmitCFIPersonality(Sym, Encoding);
807 OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
811 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
812 MCStreamer::EmitCFILsda(Sym, Encoding);
817 OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
821 void MCAsmStreamer::EmitCFIRememberState() {
822 MCStreamer::EmitCFIRememberState();
827 OS << "\t.cfi_remember_state";
831 void MCAsmStreamer::EmitCFIRestoreState() {
832 MCStreamer::EmitCFIRestoreState();
837 OS << "\t.cfi_restore_state";
841 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
842 MCStreamer::EmitCFISameValue(Register);
847 OS << "\t.cfi_same_value " << Register;
851 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
852 MCStreamer::EmitCFIRelOffset(Register, Offset);
857 OS << "\t.cfi_rel_offset " << Register << ", " << Offset;
861 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
862 MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
867 OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
871 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
872 raw_ostream &OS = GetCommentOS();
873 SmallString<256> Code;
874 SmallVector<MCFixup, 4> Fixups;
875 raw_svector_ostream VecOS(Code);
876 Emitter->EncodeInstruction(Inst, VecOS, Fixups);
879 // If we are showing fixups, create symbolic markers in the encoded
880 // representation. We do this by making a per-bit map to the fixup item index,
881 // then trying to display it as nicely as possible.
882 SmallVector<uint8_t, 64> FixupMap;
883 FixupMap.resize(Code.size() * 8);
884 for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
887 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
888 MCFixup &F = Fixups[i];
889 const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
890 for (unsigned j = 0; j != Info.TargetSize; ++j) {
891 unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
892 assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
893 FixupMap[Index] = 1 + i;
897 // FIXME: Node the fixup comments for Thumb2 are completely bogus since the
898 // high order halfword of a 32-bit Thumb2 instruction is emitted first.
900 for (unsigned i = 0, e = Code.size(); i != e; ++i) {
904 // See if all bits are the same map entry.
905 uint8_t MapEntry = FixupMap[i * 8 + 0];
906 for (unsigned j = 1; j != 8; ++j) {
907 if (FixupMap[i * 8 + j] == MapEntry)
910 MapEntry = uint8_t(~0U);
914 if (MapEntry != uint8_t(~0U)) {
916 OS << format("0x%02x", uint8_t(Code[i]));
919 // FIXME: Some of the 8 bits require fix up.
920 OS << format("0x%02x", uint8_t(Code[i])) << '\''
921 << char('A' + MapEntry - 1) << '\'';
923 OS << char('A' + MapEntry - 1);
926 // Otherwise, write out in binary.
928 for (unsigned j = 8; j--;) {
929 unsigned Bit = (Code[i] >> j) & 1;
932 if (getContext().getTargetAsmInfo().isLittleEndian())
933 FixupBit = i * 8 + j;
935 FixupBit = i * 8 + (7-j);
937 if (uint8_t MapEntry = FixupMap[FixupBit]) {
938 assert(Bit == 0 && "Encoder wrote into fixed up bit!");
939 OS << char('A' + MapEntry - 1);
947 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
948 MCFixup &F = Fixups[i];
949 const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
950 OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
951 << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
955 void MCAsmStreamer::EmitFnStart() {
960 void MCAsmStreamer::EmitFnEnd() {
965 void MCAsmStreamer::EmitCantUnwind() {
966 OS << "\t.cantunwind";
970 void MCAsmStreamer::EmitHandlerData() {
971 OS << "\t.handlerdata";
975 void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
976 OS << "\t.personality " << Personality->getName();
980 void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
981 OS << "\t.setfp\t" << InstPrinter->getRegName(FpReg)
982 << ", " << InstPrinter->getRegName(SpReg);
984 OS << ", #" << Offset;
988 void MCAsmStreamer::EmitPad(int64_t Offset) {
989 OS << "\t.pad\t#" << Offset;
993 void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
995 assert(RegList.size() && "RegList should not be empty");
1001 OS << InstPrinter->getRegName(RegList[0]);
1003 for (unsigned i = 1, e = RegList.size(); i != e; ++i)
1004 OS << ", " << InstPrinter->getRegName(RegList[i]);
1010 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
1011 assert(getCurrentSection() && "Cannot emit contents before setting section!");
1013 // Show the encoding in a comment if we have a code emitter.
1015 AddEncodingComment(Inst);
1017 // Show the MCInst if enabled.
1019 Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
1020 GetCommentOS() << "\n";
1023 // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1025 InstPrinter->printInst(&Inst, OS);
1027 Inst.print(OS, &MAI);
1031 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
1032 /// the specified string in the output .s file. This capability is
1033 /// indicated by the hasRawTextSupport() predicate.
1034 void MCAsmStreamer::EmitRawText(StringRef String) {
1035 if (!String.empty() && String.back() == '\n')
1036 String = String.substr(0, String.size()-1);
1041 void MCAsmStreamer::Finish() {
1042 // Dump out the dwarf file & directory tables and line tables.
1043 if (getContext().hasDwarfFiles() && !UseLoc)
1044 MCDwarfFileTable::Emit(this);
1047 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1048 formatted_raw_ostream &OS,
1049 bool isVerboseAsm, bool useLoc,
1051 MCInstPrinter *IP, MCCodeEmitter *CE,
1052 TargetAsmBackend *TAB, bool ShowInst) {
1053 return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
1054 IP, CE, TAB, ShowInst);