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_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
330 case MCSA_PrivateExtern: OS << "\t.private_extern\t"; break;
331 case MCSA_Protected: OS << "\t.protected\t"; break;
332 case MCSA_Reference: OS << "\t.reference\t"; break;
333 case MCSA_Weak: OS << "\t.weak\t"; break;
334 case MCSA_WeakDefinition: OS << "\t.weak_definition\t"; break;
336 case MCSA_WeakReference: OS << MAI.getWeakRefDirective(); break;
337 case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
344 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
345 OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
349 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
350 OS << "\t.def\t " << *Symbol << ';';
354 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
355 OS << "\t.scl\t" << StorageClass << ';';
359 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
360 OS << "\t.type\t" << Type << ';';
364 void MCAsmStreamer::EndCOFFSymbolDef() {
369 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
370 assert(MAI.hasDotTypeDotSizeDirective());
371 OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
374 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
375 unsigned ByteAlignment) {
376 OS << "\t.comm\t" << *Symbol << ',' << Size;
377 if (ByteAlignment != 0) {
378 if (MAI.getCOMMDirectiveAlignmentIsInBytes())
379 OS << ',' << ByteAlignment;
381 OS << ',' << Log2_32(ByteAlignment);
386 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
388 /// @param Symbol - The common symbol to emit.
389 /// @param Size - The size of the common symbol.
390 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
391 assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
392 OS << "\t.lcomm\t" << *Symbol << ',' << Size;
396 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
397 unsigned Size, unsigned ByteAlignment) {
398 // Note: a .zerofill directive does not switch sections.
401 // This is a mach-o specific directive.
402 const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
403 OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
405 if (Symbol != NULL) {
406 OS << ',' << *Symbol << ',' << Size;
407 if (ByteAlignment != 0)
408 OS << ',' << Log2_32(ByteAlignment);
413 // .tbss sym, size, align
414 // This depends that the symbol has already been mangled from the original,
416 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
417 uint64_t Size, unsigned ByteAlignment) {
418 assert(Symbol != NULL && "Symbol shouldn't be NULL!");
419 // Instead of using the Section we'll just use the shortcut.
420 // This is a mach-o specific directive and section.
421 OS << ".tbss " << *Symbol << ", " << Size;
423 // Output align if we have it. We default to 1 so don't bother printing
425 if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
430 static inline char toOctal(int X) { return (X&7)+'0'; }
432 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
435 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
436 unsigned char C = Data[i];
437 if (C == '"' || C == '\\') {
438 OS << '\\' << (char)C;
442 if (isprint((unsigned char)C)) {
448 case '\b': OS << "\\b"; break;
449 case '\f': OS << "\\f"; break;
450 case '\n': OS << "\\n"; break;
451 case '\r': OS << "\\r"; break;
452 case '\t': OS << "\\t"; break;
455 OS << toOctal(C >> 6);
456 OS << toOctal(C >> 3);
457 OS << toOctal(C >> 0);
466 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
467 assert(CurSection && "Cannot emit contents before setting section!");
468 if (Data.empty()) return;
470 if (Data.size() == 1) {
471 OS << MAI.getData8bitsDirective(AddrSpace);
472 OS << (unsigned)(unsigned char)Data[0];
477 // If the data ends with 0 and the target supports .asciz, use it, otherwise
479 if (MAI.getAscizDirective() && Data.back() == 0) {
480 OS << MAI.getAscizDirective();
481 Data = Data.substr(0, Data.size()-1);
483 OS << MAI.getAsciiDirective();
487 PrintQuotedString(Data, OS);
491 /// EmitIntValue - Special case of EmitValue that avoids the client having
492 /// to pass in a MCExpr for constant integers.
493 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
494 unsigned AddrSpace) {
495 assert(CurSection && "Cannot emit contents before setting section!");
496 const char *Directive = 0;
499 case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
500 case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
501 case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
503 Directive = MAI.getData64bitsDirective(AddrSpace);
504 // If the target doesn't support 64-bit data, emit as two 32-bit halves.
505 if (Directive) break;
506 if (isLittleEndian()) {
507 EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
508 EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
510 EmitIntValue((uint32_t)(Value >> 32), 4, AddrSpace);
511 EmitIntValue((uint32_t)(Value >> 0 ), 4, AddrSpace);
516 assert(Directive && "Invalid size for machine code value!");
517 OS << Directive << truncateToSize(Value, Size);
521 void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
522 unsigned AddrSpace) {
523 assert(CurSection && "Cannot emit contents before setting section!");
524 const char *Directive = 0;
527 case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
528 case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
529 case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
530 case 8: Directive = MAI.getData64bitsDirective(AddrSpace); break;
533 assert(Directive && "Invalid size for machine code value!");
534 OS << Directive << *Value;
538 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace) {
540 if (Value->EvaluateAsAbsolute(IntValue)) {
542 raw_svector_ostream OSE(Tmp);
543 MCObjectWriter::EncodeULEB128(IntValue, OSE);
544 EmitBytes(OSE.str(), AddrSpace);
547 assert(MAI.hasLEB128() && "Cannot print a .uleb");
548 OS << ".uleb128 " << *Value;
552 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace) {
554 if (Value->EvaluateAsAbsolute(IntValue)) {
556 raw_svector_ostream OSE(Tmp);
557 MCObjectWriter::EncodeSLEB128(IntValue, OSE);
558 EmitBytes(OSE.str(), AddrSpace);
561 assert(MAI.hasLEB128() && "Cannot print a .sleb");
562 OS << ".sleb128 " << *Value;
566 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
567 assert(MAI.getGPRel32Directive() != 0);
568 OS << MAI.getGPRel32Directive() << *Value;
573 /// EmitFill - Emit NumBytes bytes worth of the value specified by
574 /// FillValue. This implements directives such as '.space'.
575 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
576 unsigned AddrSpace) {
577 if (NumBytes == 0) return;
580 if (const char *ZeroDirective = MAI.getZeroDirective()) {
581 OS << ZeroDirective << NumBytes;
583 OS << ',' << (int)FillValue;
588 // Emit a byte at a time.
589 MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
592 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
594 unsigned MaxBytesToEmit) {
595 // Some assemblers don't support non-power of two alignments, so we always
596 // emit alignments as a power of two if possible.
597 if (isPowerOf2_32(ByteAlignment)) {
599 default: llvm_unreachable("Invalid size for machine code value!");
600 case 1: OS << MAI.getAlignDirective(); break;
601 // FIXME: use MAI for this!
602 case 2: OS << ".p2alignw "; break;
603 case 4: OS << ".p2alignl "; break;
604 case 8: llvm_unreachable("Unsupported alignment size!");
607 if (MAI.getAlignmentIsInBytes())
610 OS << Log2_32(ByteAlignment);
612 if (Value || MaxBytesToEmit) {
614 OS.write_hex(truncateToSize(Value, ValueSize));
617 OS << ", " << MaxBytesToEmit;
623 // Non-power of two alignment. This is not widely supported by assemblers.
624 // FIXME: Parameterize this based on MAI.
626 default: llvm_unreachable("Invalid size for machine code value!");
627 case 1: OS << ".balign"; break;
628 case 2: OS << ".balignw"; break;
629 case 4: OS << ".balignl"; break;
630 case 8: llvm_unreachable("Unsupported alignment size!");
633 OS << ' ' << ByteAlignment;
634 OS << ", " << truncateToSize(Value, ValueSize);
636 OS << ", " << MaxBytesToEmit;
640 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
641 unsigned MaxBytesToEmit) {
642 // Emit with a text fill value.
643 EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
647 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
648 unsigned char Value) {
649 // FIXME: Verify that Offset is associated with the current section.
650 OS << ".org " << *Offset << ", " << (unsigned) Value;
655 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
656 assert(MAI.hasSingleParameterDotFile());
658 PrintQuotedString(Filename, OS);
662 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
664 OS << "\t.file\t" << FileNo << ' ';
665 PrintQuotedString(Filename, OS);
668 return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
671 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
672 unsigned Column, unsigned Flags,
674 unsigned Discriminator) {
675 this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
680 OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
681 if (Flags & DWARF2_FLAG_BASIC_BLOCK)
682 OS << " basic_block";
683 if (Flags & DWARF2_FLAG_PROLOGUE_END)
684 OS << " prologue_end";
685 if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
686 OS << " epilogue_begin";
688 unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
689 if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
692 if (Flags & DWARF2_FLAG_IS_STMT)
701 OS << "discriminator " << Discriminator;
705 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
706 raw_ostream &OS = GetCommentOS();
707 SmallString<256> Code;
708 SmallVector<MCFixup, 4> Fixups;
709 raw_svector_ostream VecOS(Code);
710 Emitter->EncodeInstruction(Inst, VecOS, Fixups);
713 // If we are showing fixups, create symbolic markers in the encoded
714 // representation. We do this by making a per-bit map to the fixup item index,
715 // then trying to display it as nicely as possible.
716 SmallVector<uint8_t, 64> FixupMap;
717 FixupMap.resize(Code.size() * 8);
718 for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
721 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
722 MCFixup &F = Fixups[i];
723 const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
724 for (unsigned j = 0; j != Info.TargetSize; ++j) {
725 unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
726 assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
727 FixupMap[Index] = 1 + i;
732 for (unsigned i = 0, e = Code.size(); i != e; ++i) {
736 // See if all bits are the same map entry.
737 uint8_t MapEntry = FixupMap[i * 8 + 0];
738 for (unsigned j = 1; j != 8; ++j) {
739 if (FixupMap[i * 8 + j] == MapEntry)
742 MapEntry = uint8_t(~0U);
746 if (MapEntry != uint8_t(~0U)) {
748 OS << format("0x%02x", uint8_t(Code[i]));
750 assert(Code[i] == 0 && "Encoder wrote into fixed up bit!");
751 OS << char('A' + MapEntry - 1);
754 // Otherwise, write out in binary.
756 for (unsigned j = 8; j--;) {
757 unsigned Bit = (Code[i] >> j) & 1;
761 FixupBit = i * 8 + j;
763 FixupBit = i * 8 + (7-j);
765 if (uint8_t MapEntry = FixupMap[FixupBit]) {
766 assert(Bit == 0 && "Encoder wrote into fixed up bit!");
767 OS << char('A' + MapEntry - 1);
775 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
776 MCFixup &F = Fixups[i];
777 const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
778 OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
779 << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
783 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
784 assert(CurSection && "Cannot emit contents before setting section!");
787 MCLineEntry::Make(this, getCurrentSection());
789 // Show the encoding in a comment if we have a code emitter.
791 AddEncodingComment(Inst);
793 // Show the MCInst if enabled.
795 Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
796 GetCommentOS() << "\n";
799 // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
801 InstPrinter->printInst(&Inst, OS);
803 Inst.print(OS, &MAI);
807 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
808 /// the specified string in the output .s file. This capability is
809 /// indicated by the hasRawTextSupport() predicate.
810 void MCAsmStreamer::EmitRawText(StringRef String) {
811 if (!String.empty() && String.back() == '\n')
812 String = String.substr(0, String.size()-1);
817 void MCAsmStreamer::Finish() {
818 // Dump out the dwarf file & directory tables and line tables.
819 if (getContext().hasDwarfFiles() && TLOF) {
820 MCDwarfFileTable::Emit(this, TLOF->getDwarfLineSection(), NULL,
825 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
826 formatted_raw_ostream &OS,
828 bool isVerboseAsm, MCInstPrinter *IP,
829 MCCodeEmitter *CE, bool ShowInst) {
830 return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
831 NULL, 0, IP, CE, ShowInst);
835 MCStreamer *llvm::createAsmStreamerNoLoc(MCContext &Context,
836 formatted_raw_ostream &OS,
839 const TargetLoweringObjectFile *TLOF,
842 MCCodeEmitter *CE, bool ShowInst) {
843 return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
844 TLOF, PointerSize, IP, CE, ShowInst);