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/MCInst.h"
16 #include "llvm/MC/MCInstPrinter.h"
17 #include "llvm/MC/MCSectionMachO.h"
18 #include "llvm/MC/MCSymbol.h"
19 #include "llvm/ADT/OwningPtr.h"
20 #include "llvm/ADT/SmallString.h"
21 #include "llvm/ADT/Twine.h"
22 #include "llvm/Support/ErrorHandling.h"
23 #include "llvm/Support/MathExtras.h"
24 #include "llvm/Support/Format.h"
25 #include "llvm/Support/FormattedStream.h"
26 #include "llvm/Target/TargetLoweringObjectFile.h"
31 class MCAsmStreamer : public MCStreamer {
32 formatted_raw_ostream &OS;
34 OwningPtr<MCInstPrinter> InstPrinter;
35 OwningPtr<MCCodeEmitter> Emitter;
37 SmallString<128> CommentToEmit;
38 raw_svector_ostream CommentStream;
40 const TargetLoweringObjectFile *TLOF;
43 unsigned IsLittleEndian : 1;
44 unsigned IsVerboseAsm : 1;
45 unsigned ShowInst : 1;
48 MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
49 bool isLittleEndian, bool isVerboseAsm,
50 const TargetLoweringObjectFile *tlof, int pointerSize,
51 MCInstPrinter *printer, MCCodeEmitter *emitter, bool showInst)
52 : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
53 InstPrinter(printer), Emitter(emitter), CommentStream(CommentToEmit),
54 TLOF(tlof), PointerSize(pointerSize),
55 IsLittleEndian(isLittleEndian), IsVerboseAsm(isVerboseAsm),
57 if (InstPrinter && IsVerboseAsm)
58 InstPrinter->setCommentStream(CommentStream);
62 bool isLittleEndian() const { return IsLittleEndian; }
64 inline void EmitEOL() {
65 // If we don't have any comments, just emit a \n.
72 void EmitCommentsAndEOL();
74 /// isVerboseAsm - Return true if this streamer supports verbose assembly at
76 virtual bool isVerboseAsm() const { return IsVerboseAsm; }
78 /// hasRawTextSupport - We support EmitRawText.
79 virtual bool hasRawTextSupport() const { return true; }
81 /// AddComment - Add a comment that can be emitted to the generated .s
82 /// file if applicable as a QoI issue to make the output of the compiler
83 /// more readable. This only affects the MCAsmStreamer, and only when
84 /// verbose assembly output is enabled.
85 virtual void AddComment(const Twine &T);
87 /// AddEncodingComment - Add a comment showing the encoding of an instruction.
88 virtual void AddEncodingComment(const MCInst &Inst);
90 /// GetCommentOS - Return a raw_ostream that comments can be written to.
91 /// Unlike AddComment, you are required to terminate comments with \n if you
93 virtual raw_ostream &GetCommentOS() {
95 return nulls(); // Discard comments unless in verbose asm mode.
99 /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
100 virtual void AddBlankLine() {
104 /// @name MCStreamer Interface
107 virtual void SwitchSection(const MCSection *Section);
109 virtual void InitSections() {
110 // FIXME, this is MachO specific, but the testsuite
112 SwitchSection(getContext().getMachOSection("__TEXT", "__text",
113 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
114 0, SectionKind::getText()));
117 virtual void EmitLabel(MCSymbol *Symbol);
119 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
120 virtual void EmitThumbFunc(MCSymbol *Func);
122 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
123 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
125 virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
127 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
128 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
129 virtual void EmitCOFFSymbolStorageClass(int StorageClass);
130 virtual void EmitCOFFSymbolType(int Type);
131 virtual void EndCOFFSymbolDef();
132 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
133 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
134 unsigned ByteAlignment);
136 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
138 /// @param Symbol - The common symbol to emit.
139 /// @param Size - The size of the common symbol.
140 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
142 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
143 unsigned Size = 0, unsigned ByteAlignment = 0);
145 virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
146 uint64_t Size, unsigned ByteAlignment = 0);
148 virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
150 virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
152 virtual void EmitIntValue(uint64_t Value, unsigned Size, unsigned AddrSpace);
154 virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
156 virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
158 virtual void EmitGPRel32Value(const MCExpr *Value);
161 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
164 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
165 unsigned ValueSize = 1,
166 unsigned MaxBytesToEmit = 0);
168 virtual void EmitCodeAlignment(unsigned ByteAlignment,
169 unsigned MaxBytesToEmit = 0);
171 virtual void EmitValueToOffset(const MCExpr *Offset,
172 unsigned char Value = 0);
174 virtual void EmitFileDirective(StringRef Filename);
175 virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
176 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
177 unsigned Column, unsigned Flags,
178 unsigned Isa, unsigned Discriminator);
180 virtual void EmitInstruction(const MCInst &Inst);
182 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
183 /// the specified string in the output .s file. This capability is
184 /// indicated by the hasRawTextSupport() predicate.
185 virtual void EmitRawText(StringRef String);
187 virtual void Finish();
192 } // end anonymous namespace.
194 /// AddComment - Add a comment that can be emitted to the generated .s
195 /// file if applicable as a QoI issue to make the output of the compiler
196 /// more readable. This only affects the MCAsmStreamer, and only when
197 /// verbose assembly output is enabled.
198 void MCAsmStreamer::AddComment(const Twine &T) {
199 if (!IsVerboseAsm) return;
201 // Make sure that CommentStream is flushed.
202 CommentStream.flush();
204 T.toVector(CommentToEmit);
205 // Each comment goes on its own line.
206 CommentToEmit.push_back('\n');
208 // Tell the comment stream that the vector changed underneath it.
209 CommentStream.resync();
212 void MCAsmStreamer::EmitCommentsAndEOL() {
213 if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
218 CommentStream.flush();
219 StringRef Comments = CommentToEmit.str();
221 assert(Comments.back() == '\n' &&
222 "Comment array not newline terminated");
224 // Emit a line of comments.
225 OS.PadToColumn(MAI.getCommentColumn());
226 size_t Position = Comments.find('\n');
227 OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
229 Comments = Comments.substr(Position+1);
230 } while (!Comments.empty());
232 CommentToEmit.clear();
233 // Tell the comment stream that the vector changed underneath it.
234 CommentStream.resync();
237 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
238 assert(Bytes && "Invalid size!");
239 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
242 void MCAsmStreamer::SwitchSection(const MCSection *Section) {
243 assert(Section && "Cannot switch to a null section!");
244 if (Section != CurSection) {
245 PrevSection = CurSection;
246 CurSection = Section;
247 Section->PrintSwitchToSection(MAI, OS);
251 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
252 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
253 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
254 assert(CurSection && "Cannot emit before setting section!");
256 OS << *Symbol << MAI.getLabelSuffix();
258 Symbol->setSection(*CurSection);
261 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
263 default: assert(0 && "Invalid flag!");
264 case MCAF_SyntaxUnified: OS << "\t.syntax unified"; break;
265 case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
266 case MCAF_Code16: OS << "\t.code\t16"; break;
267 case MCAF_Code32: OS << "\t.code\t32"; break;
272 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
273 // This needs to emit to a temporary string to get properly quoted
274 // MCSymbols when they have spaces in them.
275 OS << "\t.thumb_func";
281 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
282 OS << *Symbol << " = " << *Value;
285 // FIXME: Lift context changes into super class.
286 Symbol->setVariableValue(Value);
289 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
290 OS << ".weakref " << *Alias << ", " << *Symbol;
294 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
295 MCSymbolAttr Attribute) {
297 case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
298 case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC # aka @function
299 case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
300 case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT # aka @object
301 case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS # aka @tls_object
302 case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON # aka @common
303 case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE # aka @notype
304 case MCSA_ELF_TypeGnuUniqueObject: /// .type _foo, @gnu_unique_object
305 assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
306 OS << "\t.type\t" << *Symbol << ','
307 << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
309 default: assert(0 && "Unknown ELF .type");
310 case MCSA_ELF_TypeFunction: OS << "function"; break;
311 case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
312 case MCSA_ELF_TypeObject: OS << "object"; break;
313 case MCSA_ELF_TypeTLS: OS << "tls_object"; break;
314 case MCSA_ELF_TypeCommon: OS << "common"; break;
315 case MCSA_ELF_TypeNoType: OS << "no_type"; break;
316 case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
320 case MCSA_Global: // .globl/.global
321 OS << MAI.getGlobalDirective();
323 case MCSA_Hidden: OS << "\t.hidden\t"; break;
324 case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
325 case MCSA_Internal: OS << "\t.internal\t"; break;
326 case MCSA_LazyReference: OS << "\t.lazy_reference\t"; break;
327 case MCSA_Local: OS << "\t.local\t"; break;
328 case MCSA_NoDeadStrip: OS << "\t.no_dead_strip\t"; break;
329 case MCSA_PrivateExtern: OS << "\t.private_extern\t"; break;
330 case MCSA_Protected: OS << "\t.protected\t"; break;
331 case MCSA_Reference: OS << "\t.reference\t"; break;
332 case MCSA_Weak: OS << "\t.weak\t"; break;
333 case MCSA_WeakDefinition: OS << "\t.weak_definition\t"; break;
335 case MCSA_WeakReference: OS << MAI.getWeakRefDirective(); break;
336 case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
343 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
344 OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
348 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
349 OS << "\t.def\t " << *Symbol << ';';
353 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
354 OS << "\t.scl\t" << StorageClass << ';';
358 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
359 OS << "\t.type\t" << Type << ';';
363 void MCAsmStreamer::EndCOFFSymbolDef() {
368 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
369 assert(MAI.hasDotTypeDotSizeDirective());
370 OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
373 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
374 unsigned ByteAlignment) {
375 OS << "\t.comm\t" << *Symbol << ',' << Size;
376 if (ByteAlignment != 0) {
377 if (MAI.getCOMMDirectiveAlignmentIsInBytes())
378 OS << ',' << ByteAlignment;
380 OS << ',' << Log2_32(ByteAlignment);
385 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
387 /// @param Symbol - The common symbol to emit.
388 /// @param Size - The size of the common symbol.
389 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
390 assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
391 OS << "\t.lcomm\t" << *Symbol << ',' << Size;
395 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
396 unsigned Size, unsigned ByteAlignment) {
397 // Note: a .zerofill directive does not switch sections.
400 // This is a mach-o specific directive.
401 const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
402 OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
404 if (Symbol != NULL) {
405 OS << ',' << *Symbol << ',' << Size;
406 if (ByteAlignment != 0)
407 OS << ',' << Log2_32(ByteAlignment);
412 // .tbss sym, size, align
413 // This depends that the symbol has already been mangled from the original,
415 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
416 uint64_t Size, unsigned ByteAlignment) {
417 assert(Symbol != NULL && "Symbol shouldn't be NULL!");
418 // Instead of using the Section we'll just use the shortcut.
419 // This is a mach-o specific directive and section.
420 OS << ".tbss " << *Symbol << ", " << Size;
422 // Output align if we have it. We default to 1 so don't bother printing
424 if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
429 static inline char toOctal(int X) { return (X&7)+'0'; }
431 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
434 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
435 unsigned char C = Data[i];
436 if (C == '"' || C == '\\') {
437 OS << '\\' << (char)C;
441 if (isprint((unsigned char)C)) {
447 case '\b': OS << "\\b"; break;
448 case '\f': OS << "\\f"; break;
449 case '\n': OS << "\\n"; break;
450 case '\r': OS << "\\r"; break;
451 case '\t': OS << "\\t"; break;
454 OS << toOctal(C >> 6);
455 OS << toOctal(C >> 3);
456 OS << toOctal(C >> 0);
465 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
466 assert(CurSection && "Cannot emit contents before setting section!");
467 if (Data.empty()) return;
469 if (Data.size() == 1) {
470 OS << MAI.getData8bitsDirective(AddrSpace);
471 OS << (unsigned)(unsigned char)Data[0];
476 // If the data ends with 0 and the target supports .asciz, use it, otherwise
478 if (MAI.getAscizDirective() && Data.back() == 0) {
479 OS << MAI.getAscizDirective();
480 Data = Data.substr(0, Data.size()-1);
482 OS << MAI.getAsciiDirective();
486 PrintQuotedString(Data, OS);
490 /// EmitIntValue - Special case of EmitValue that avoids the client having
491 /// to pass in a MCExpr for constant integers.
492 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
493 unsigned AddrSpace) {
494 assert(CurSection && "Cannot emit contents before setting section!");
495 const char *Directive = 0;
498 case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
499 case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
500 case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
502 Directive = MAI.getData64bitsDirective(AddrSpace);
503 // If the target doesn't support 64-bit data, emit as two 32-bit halves.
504 if (Directive) break;
505 if (isLittleEndian()) {
506 EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
507 EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
509 EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
510 EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
515 assert(Directive && "Invalid size for machine code value!");
516 OS << Directive << truncateToSize(Value, Size);
520 void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
521 unsigned AddrSpace) {
522 assert(CurSection && "Cannot emit contents before setting section!");
523 const char *Directive = 0;
526 case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
527 case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
528 case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
529 case 8: Directive = MAI.getData64bitsDirective(AddrSpace); break;
532 assert(Directive && "Invalid size for machine code value!");
533 OS << Directive << *Value;
537 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace) {
539 if (Value->EvaluateAsAbsolute(IntValue)) {
541 raw_svector_ostream OSE(Tmp);
542 MCObjectWriter::EncodeULEB128(IntValue, OSE);
543 EmitBytes(OSE.str(), AddrSpace);
546 assert(MAI.hasLEB128() && "Cannot print a .uleb");
547 OS << ".uleb128 " << *Value;
551 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace) {
553 if (Value->EvaluateAsAbsolute(IntValue)) {
555 raw_svector_ostream OSE(Tmp);
556 MCObjectWriter::EncodeSLEB128(IntValue, OSE);
557 EmitBytes(OSE.str(), AddrSpace);
560 assert(MAI.hasLEB128() && "Cannot print a .sleb");
561 OS << ".sleb128 " << *Value;
565 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
566 assert(MAI.getGPRel32Directive() != 0);
567 OS << MAI.getGPRel32Directive() << *Value;
572 /// EmitFill - Emit NumBytes bytes worth of the value specified by
573 /// FillValue. This implements directives such as '.space'.
574 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
575 unsigned AddrSpace) {
576 if (NumBytes == 0) return;
579 if (const char *ZeroDirective = MAI.getZeroDirective()) {
580 OS << ZeroDirective << NumBytes;
582 OS << ',' << (int)FillValue;
587 // Emit a byte at a time.
588 MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
591 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
593 unsigned MaxBytesToEmit) {
594 // Some assemblers don't support non-power of two alignments, so we always
595 // emit alignments as a power of two if possible.
596 if (isPowerOf2_32(ByteAlignment)) {
598 default: llvm_unreachable("Invalid size for machine code value!");
599 case 1: OS << MAI.getAlignDirective(); break;
600 // FIXME: use MAI for this!
601 case 2: OS << ".p2alignw "; break;
602 case 4: OS << ".p2alignl "; break;
603 case 8: llvm_unreachable("Unsupported alignment size!");
606 if (MAI.getAlignmentIsInBytes())
609 OS << Log2_32(ByteAlignment);
611 if (Value || MaxBytesToEmit) {
613 OS.write_hex(truncateToSize(Value, ValueSize));
616 OS << ", " << MaxBytesToEmit;
622 // Non-power of two alignment. This is not widely supported by assemblers.
623 // FIXME: Parameterize this based on MAI.
625 default: llvm_unreachable("Invalid size for machine code value!");
626 case 1: OS << ".balign"; break;
627 case 2: OS << ".balignw"; break;
628 case 4: OS << ".balignl"; break;
629 case 8: llvm_unreachable("Unsupported alignment size!");
632 OS << ' ' << ByteAlignment;
633 OS << ", " << truncateToSize(Value, ValueSize);
635 OS << ", " << MaxBytesToEmit;
639 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
640 unsigned MaxBytesToEmit) {
641 // Emit with a text fill value.
642 EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
646 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
647 unsigned char Value) {
648 // FIXME: Verify that Offset is associated with the current section.
649 OS << ".org " << *Offset << ", " << (unsigned) Value;
654 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
655 assert(MAI.hasSingleParameterDotFile());
657 PrintQuotedString(Filename, OS);
661 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
663 OS << "\t.file\t" << FileNo << ' ';
664 PrintQuotedString(Filename, OS);
667 return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
670 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
671 unsigned Column, unsigned Flags,
673 unsigned Discriminator) {
674 this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
679 OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
680 if (Flags & DWARF2_FLAG_BASIC_BLOCK)
681 OS << " basic_block";
682 if (Flags & DWARF2_FLAG_PROLOGUE_END)
683 OS << " prologue_end";
684 if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
685 OS << " epilogue_begin";
687 unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
688 if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
691 if (Flags & DWARF2_FLAG_IS_STMT)
700 OS << "discriminator " << Discriminator;
704 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
705 raw_ostream &OS = GetCommentOS();
706 SmallString<256> Code;
707 SmallVector<MCFixup, 4> Fixups;
708 raw_svector_ostream VecOS(Code);
709 Emitter->EncodeInstruction(Inst, VecOS, Fixups);
712 // If we are showing fixups, create symbolic markers in the encoded
713 // representation. We do this by making a per-bit map to the fixup item index,
714 // then trying to display it as nicely as possible.
715 SmallVector<uint8_t, 64> FixupMap;
716 FixupMap.resize(Code.size() * 8);
717 for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
720 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
721 MCFixup &F = Fixups[i];
722 const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
723 for (unsigned j = 0; j != Info.TargetSize; ++j) {
724 unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
725 assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
726 FixupMap[Index] = 1 + i;
731 for (unsigned i = 0, e = Code.size(); i != e; ++i) {
735 // See if all bits are the same map entry.
736 uint8_t MapEntry = FixupMap[i * 8 + 0];
737 for (unsigned j = 1; j != 8; ++j) {
738 if (FixupMap[i * 8 + j] == MapEntry)
741 MapEntry = uint8_t(~0U);
745 if (MapEntry != uint8_t(~0U)) {
747 OS << format("0x%02x", uint8_t(Code[i]));
749 assert(Code[i] == 0 && "Encoder wrote into fixed up bit!");
750 OS << char('A' + MapEntry - 1);
753 // Otherwise, write out in binary.
755 for (unsigned j = 8; j--;) {
756 unsigned Bit = (Code[i] >> j) & 1;
760 FixupBit = i * 8 + j;
762 FixupBit = i * 8 + (7-j);
764 if (uint8_t MapEntry = FixupMap[FixupBit]) {
765 assert(Bit == 0 && "Encoder wrote into fixed up bit!");
766 OS << char('A' + MapEntry - 1);
774 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
775 MCFixup &F = Fixups[i];
776 const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
777 OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
778 << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
782 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
783 assert(CurSection && "Cannot emit contents before setting section!");
786 MCLineEntry::Make(this, getCurrentSection());
788 // Show the encoding in a comment if we have a code emitter.
790 AddEncodingComment(Inst);
792 // Show the MCInst if enabled.
794 Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
795 GetCommentOS() << "\n";
798 // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
800 InstPrinter->printInst(&Inst, OS);
802 Inst.print(OS, &MAI);
806 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
807 /// the specified string in the output .s file. This capability is
808 /// indicated by the hasRawTextSupport() predicate.
809 void MCAsmStreamer::EmitRawText(StringRef String) {
810 if (!String.empty() && String.back() == '\n')
811 String = String.substr(0, String.size()-1);
816 void MCAsmStreamer::Finish() {
817 // Dump out the dwarf file & directory tables and line tables.
818 if (getContext().hasDwarfFiles() && TLOF) {
819 MCDwarfFileTable::Emit(this, TLOF->getDwarfLineSection(), NULL,
824 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
825 formatted_raw_ostream &OS,
827 bool isVerboseAsm, MCInstPrinter *IP,
828 MCCodeEmitter *CE, bool ShowInst) {
829 return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
830 NULL, 0, IP, CE, ShowInst);
834 MCStreamer *llvm::createAsmStreamerNoLoc(MCContext &Context,
835 formatted_raw_ostream &OS,
838 const TargetLoweringObjectFile *TLOF,
841 MCCodeEmitter *CE, bool ShowInst) {
842 return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
843 TLOF, PointerSize, IP, CE, ShowInst);