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;
47 bool needsSet(const MCExpr *Value);
50 MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
51 bool isLittleEndian, bool isVerboseAsm,
52 const TargetLoweringObjectFile *tlof, int pointerSize,
53 MCInstPrinter *printer, MCCodeEmitter *emitter, bool showInst)
54 : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
55 InstPrinter(printer), Emitter(emitter), CommentStream(CommentToEmit),
56 TLOF(tlof), PointerSize(pointerSize),
57 IsLittleEndian(isLittleEndian), IsVerboseAsm(isVerboseAsm),
59 if (InstPrinter && IsVerboseAsm)
60 InstPrinter->setCommentStream(CommentStream);
64 bool isLittleEndian() const { return IsLittleEndian; }
66 inline void EmitEOL() {
67 // If we don't have any comments, just emit a \n.
74 void EmitCommentsAndEOL();
76 /// isVerboseAsm - Return true if this streamer supports verbose assembly at
78 virtual bool isVerboseAsm() const { return IsVerboseAsm; }
80 /// hasRawTextSupport - We support EmitRawText.
81 virtual bool hasRawTextSupport() const { return true; }
83 /// AddComment - Add a comment that can be emitted to the generated .s
84 /// file if applicable as a QoI issue to make the output of the compiler
85 /// more readable. This only affects the MCAsmStreamer, and only when
86 /// verbose assembly output is enabled.
87 virtual void AddComment(const Twine &T);
89 /// AddEncodingComment - Add a comment showing the encoding of an instruction.
90 virtual void AddEncodingComment(const MCInst &Inst);
92 /// GetCommentOS - Return a raw_ostream that comments can be written to.
93 /// Unlike AddComment, you are required to terminate comments with \n if you
95 virtual raw_ostream &GetCommentOS() {
97 return nulls(); // Discard comments unless in verbose asm mode.
101 /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
102 virtual void AddBlankLine() {
106 /// @name MCStreamer Interface
109 virtual void SwitchSection(const MCSection *Section);
111 virtual void InitSections() {
112 // FIXME, this is MachO specific, but the testsuite
114 SwitchSection(getContext().getMachOSection("__TEXT", "__text",
115 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
116 0, SectionKind::getText()));
119 virtual void EmitLabel(MCSymbol *Symbol);
121 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
122 virtual void EmitThumbFunc(MCSymbol *Func);
124 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
125 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
126 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
127 const MCSymbol *LastLabel,
128 const MCSymbol *Label);
130 virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
132 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
133 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
134 virtual void EmitCOFFSymbolStorageClass(int StorageClass);
135 virtual void EmitCOFFSymbolType(int Type);
136 virtual void EndCOFFSymbolDef();
137 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
138 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
139 unsigned ByteAlignment);
141 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
143 /// @param Symbol - The common symbol to emit.
144 /// @param Size - The size of the common symbol.
145 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
147 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
148 unsigned Size = 0, unsigned ByteAlignment = 0);
150 virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
151 uint64_t Size, unsigned ByteAlignment = 0);
153 virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
155 virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
156 virtual void EmitIntValue(uint64_t Value, unsigned Size,
157 unsigned AddrSpace = 0);
159 virtual void EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
161 virtual void EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace = 0);
163 virtual void EmitGPRel32Value(const MCExpr *Value);
166 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
169 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
170 unsigned ValueSize = 1,
171 unsigned MaxBytesToEmit = 0);
173 virtual void EmitCodeAlignment(unsigned ByteAlignment,
174 unsigned MaxBytesToEmit = 0);
176 virtual void EmitValueToOffset(const MCExpr *Offset,
177 unsigned char Value = 0);
179 virtual void EmitFileDirective(StringRef Filename);
180 virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
181 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
182 unsigned Column, unsigned Flags,
183 unsigned Isa, unsigned Discriminator);
185 virtual bool EmitCFIStartProc();
186 virtual bool EmitCFIEndProc();
187 virtual bool EmitCFIDefCfaOffset(int64_t Offset);
188 virtual bool EmitCFIDefCfaRegister(int64_t Register);
189 virtual bool EmitCFIOffset(int64_t Register, int64_t Offset);
190 virtual bool EmitCFIPersonality(const MCSymbol *Sym);
191 virtual bool EmitCFILsda(const MCSymbol *Sym);
193 virtual void EmitInstruction(const MCInst &Inst);
195 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
196 /// the specified string in the output .s file. This capability is
197 /// indicated by the hasRawTextSupport() predicate.
198 virtual void EmitRawText(StringRef String);
200 virtual void Finish();
205 } // end anonymous namespace.
207 /// AddComment - Add a comment that can be emitted to the generated .s
208 /// file if applicable as a QoI issue to make the output of the compiler
209 /// more readable. This only affects the MCAsmStreamer, and only when
210 /// verbose assembly output is enabled.
211 void MCAsmStreamer::AddComment(const Twine &T) {
212 if (!IsVerboseAsm) return;
214 // Make sure that CommentStream is flushed.
215 CommentStream.flush();
217 T.toVector(CommentToEmit);
218 // Each comment goes on its own line.
219 CommentToEmit.push_back('\n');
221 // Tell the comment stream that the vector changed underneath it.
222 CommentStream.resync();
225 void MCAsmStreamer::EmitCommentsAndEOL() {
226 if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
231 CommentStream.flush();
232 StringRef Comments = CommentToEmit.str();
234 assert(Comments.back() == '\n' &&
235 "Comment array not newline terminated");
237 // Emit a line of comments.
238 OS.PadToColumn(MAI.getCommentColumn());
239 size_t Position = Comments.find('\n');
240 OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
242 Comments = Comments.substr(Position+1);
243 } while (!Comments.empty());
245 CommentToEmit.clear();
246 // Tell the comment stream that the vector changed underneath it.
247 CommentStream.resync();
250 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
251 assert(Bytes && "Invalid size!");
252 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
255 void MCAsmStreamer::SwitchSection(const MCSection *Section) {
256 assert(Section && "Cannot switch to a null section!");
257 if (Section != CurSection) {
258 PrevSection = CurSection;
259 CurSection = Section;
260 Section->PrintSwitchToSection(MAI, OS);
264 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
265 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
266 assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
267 assert(CurSection && "Cannot emit before setting section!");
269 OS << *Symbol << MAI.getLabelSuffix();
271 Symbol->setSection(*CurSection);
274 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
276 default: assert(0 && "Invalid flag!");
277 case MCAF_SyntaxUnified: OS << "\t.syntax unified"; break;
278 case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
279 case MCAF_Code16: OS << "\t.code\t16"; break;
280 case MCAF_Code32: OS << "\t.code\t32"; break;
285 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
286 // This needs to emit to a temporary string to get properly quoted
287 // MCSymbols when they have spaces in them.
288 OS << "\t.thumb_func";
294 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
295 OS << *Symbol << " = " << *Value;
298 // FIXME: Lift context changes into super class.
299 Symbol->setVariableValue(Value);
302 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
303 OS << ".weakref " << *Alias << ", " << *Symbol;
307 void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
308 const MCSymbol *LastLabel,
309 const MCSymbol *Label) {
310 EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
313 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
314 MCSymbolAttr Attribute) {
316 case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
317 case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC # aka @function
318 case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
319 case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT # aka @object
320 case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS # aka @tls_object
321 case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON # aka @common
322 case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE # aka @notype
323 case MCSA_ELF_TypeGnuUniqueObject: /// .type _foo, @gnu_unique_object
324 assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
325 OS << "\t.type\t" << *Symbol << ','
326 << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
328 default: assert(0 && "Unknown ELF .type");
329 case MCSA_ELF_TypeFunction: OS << "function"; break;
330 case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
331 case MCSA_ELF_TypeObject: OS << "object"; break;
332 case MCSA_ELF_TypeTLS: OS << "tls_object"; break;
333 case MCSA_ELF_TypeCommon: OS << "common"; break;
334 case MCSA_ELF_TypeNoType: OS << "no_type"; break;
335 case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
339 case MCSA_Global: // .globl/.global
340 OS << MAI.getGlobalDirective();
342 case MCSA_Hidden: OS << "\t.hidden\t"; break;
343 case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
344 case MCSA_Internal: OS << "\t.internal\t"; break;
345 case MCSA_LazyReference: OS << "\t.lazy_reference\t"; break;
346 case MCSA_Local: OS << "\t.local\t"; break;
347 case MCSA_NoDeadStrip: OS << "\t.no_dead_strip\t"; break;
348 case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
349 case MCSA_PrivateExtern: OS << "\t.private_extern\t"; break;
350 case MCSA_Protected: OS << "\t.protected\t"; break;
351 case MCSA_Reference: OS << "\t.reference\t"; break;
352 case MCSA_Weak: OS << "\t.weak\t"; break;
353 case MCSA_WeakDefinition: OS << "\t.weak_definition\t"; break;
355 case MCSA_WeakReference: OS << MAI.getWeakRefDirective(); break;
356 case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
363 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
364 OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
368 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
369 OS << "\t.def\t " << *Symbol << ';';
373 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
374 OS << "\t.scl\t" << StorageClass << ';';
378 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
379 OS << "\t.type\t" << Type << ';';
383 void MCAsmStreamer::EndCOFFSymbolDef() {
388 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
389 assert(MAI.hasDotTypeDotSizeDirective());
390 OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
393 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
394 unsigned ByteAlignment) {
395 OS << "\t.comm\t" << *Symbol << ',' << Size;
396 if (ByteAlignment != 0) {
397 if (MAI.getCOMMDirectiveAlignmentIsInBytes())
398 OS << ',' << ByteAlignment;
400 OS << ',' << Log2_32(ByteAlignment);
405 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
407 /// @param Symbol - The common symbol to emit.
408 /// @param Size - The size of the common symbol.
409 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
410 assert(MAI.hasLCOMMDirective() && "Doesn't have .lcomm, can't emit it!");
411 OS << "\t.lcomm\t" << *Symbol << ',' << Size;
415 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
416 unsigned Size, unsigned ByteAlignment) {
417 // Note: a .zerofill directive does not switch sections.
420 // This is a mach-o specific directive.
421 const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
422 OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
424 if (Symbol != NULL) {
425 OS << ',' << *Symbol << ',' << Size;
426 if (ByteAlignment != 0)
427 OS << ',' << Log2_32(ByteAlignment);
432 // .tbss sym, size, align
433 // This depends that the symbol has already been mangled from the original,
435 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
436 uint64_t Size, unsigned ByteAlignment) {
437 assert(Symbol != NULL && "Symbol shouldn't be NULL!");
438 // Instead of using the Section we'll just use the shortcut.
439 // This is a mach-o specific directive and section.
440 OS << ".tbss " << *Symbol << ", " << Size;
442 // Output align if we have it. We default to 1 so don't bother printing
444 if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
449 static inline char toOctal(int X) { return (X&7)+'0'; }
451 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
454 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
455 unsigned char C = Data[i];
456 if (C == '"' || C == '\\') {
457 OS << '\\' << (char)C;
461 if (isprint((unsigned char)C)) {
467 case '\b': OS << "\\b"; break;
468 case '\f': OS << "\\f"; break;
469 case '\n': OS << "\\n"; break;
470 case '\r': OS << "\\r"; break;
471 case '\t': OS << "\\t"; break;
474 OS << toOctal(C >> 6);
475 OS << toOctal(C >> 3);
476 OS << toOctal(C >> 0);
485 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
486 assert(CurSection && "Cannot emit contents before setting section!");
487 if (Data.empty()) return;
489 if (Data.size() == 1) {
490 OS << MAI.getData8bitsDirective(AddrSpace);
491 OS << (unsigned)(unsigned char)Data[0];
496 // If the data ends with 0 and the target supports .asciz, use it, otherwise
498 if (MAI.getAscizDirective() && Data.back() == 0) {
499 OS << MAI.getAscizDirective();
500 Data = Data.substr(0, Data.size()-1);
502 OS << MAI.getAsciiDirective();
506 PrintQuotedString(Data, OS);
510 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
511 unsigned AddrSpace) {
512 EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
515 static bool hasSymbolDifference(const MCExpr *Value) {
516 switch (Value->getKind()) {
517 case MCExpr::Target: llvm_unreachable("Can't handle target exprs yet!");
518 case MCExpr::Constant:
519 case MCExpr::SymbolRef:
522 return hasSymbolDifference(cast<MCUnaryExpr>(Value)->getSubExpr());
523 case MCExpr::Binary: {
524 const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
525 if (BE->getOpcode() == MCBinaryExpr::Sub &&
526 BE->getLHS()->getKind() == MCExpr::SymbolRef &&
527 BE->getRHS()->getKind() == MCExpr::SymbolRef)
529 return hasSymbolDifference(BE->getLHS()) ||
530 hasSymbolDifference(BE->getRHS());
533 llvm_unreachable("Switch covers all cases");
536 bool MCAsmStreamer::needsSet(const MCExpr *Value) {
537 return getContext().getAsmInfo().needsSetToChangeDiffSize() &&
538 hasSymbolDifference(Value);
541 void MCAsmStreamer::EmitValue(const MCExpr *Value, unsigned Size,
542 unsigned AddrSpace) {
543 assert(CurSection && "Cannot emit contents before setting section!");
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 (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 if (needsSet(Value)) {
569 MCSymbol *SetLabel = getContext().CreateTempSymbol();
570 EmitAssignment(SetLabel, Value);
571 OS << Directive << *SetLabel;
576 OS << Directive << *Value;
580 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value, unsigned AddrSpace) {
582 if (Value->EvaluateAsAbsolute(IntValue)) {
583 EmitULEB128IntValue(IntValue, AddrSpace);
586 assert(MAI.hasLEB128() && "Cannot print a .uleb");
587 OS << ".uleb128 " << *Value;
591 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value, unsigned AddrSpace) {
593 if (Value->EvaluateAsAbsolute(IntValue)) {
594 EmitSLEB128IntValue(IntValue, AddrSpace);
597 assert(MAI.hasLEB128() && "Cannot print a .sleb");
598 OS << ".sleb128 " << *Value;
602 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
603 assert(MAI.getGPRel32Directive() != 0);
604 OS << MAI.getGPRel32Directive() << *Value;
609 /// EmitFill - Emit NumBytes bytes worth of the value specified by
610 /// FillValue. This implements directives such as '.space'.
611 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
612 unsigned AddrSpace) {
613 if (NumBytes == 0) return;
616 if (const char *ZeroDirective = MAI.getZeroDirective()) {
617 OS << ZeroDirective << NumBytes;
619 OS << ',' << (int)FillValue;
624 // Emit a byte at a time.
625 MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
628 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
630 unsigned MaxBytesToEmit) {
631 // Some assemblers don't support non-power of two alignments, so we always
632 // emit alignments as a power of two if possible.
633 if (isPowerOf2_32(ByteAlignment)) {
635 default: llvm_unreachable("Invalid size for machine code value!");
636 case 1: OS << MAI.getAlignDirective(); break;
637 // FIXME: use MAI for this!
638 case 2: OS << ".p2alignw "; break;
639 case 4: OS << ".p2alignl "; break;
640 case 8: llvm_unreachable("Unsupported alignment size!");
643 if (MAI.getAlignmentIsInBytes())
646 OS << Log2_32(ByteAlignment);
648 if (Value || MaxBytesToEmit) {
650 OS.write_hex(truncateToSize(Value, ValueSize));
653 OS << ", " << MaxBytesToEmit;
659 // Non-power of two alignment. This is not widely supported by assemblers.
660 // FIXME: Parameterize this based on MAI.
662 default: llvm_unreachable("Invalid size for machine code value!");
663 case 1: OS << ".balign"; break;
664 case 2: OS << ".balignw"; break;
665 case 4: OS << ".balignl"; break;
666 case 8: llvm_unreachable("Unsupported alignment size!");
669 OS << ' ' << ByteAlignment;
670 OS << ", " << truncateToSize(Value, ValueSize);
672 OS << ", " << MaxBytesToEmit;
676 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
677 unsigned MaxBytesToEmit) {
678 // Emit with a text fill value.
679 EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
683 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
684 unsigned char Value) {
685 // FIXME: Verify that Offset is associated with the current section.
686 OS << ".org " << *Offset << ", " << (unsigned) Value;
691 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
692 assert(MAI.hasSingleParameterDotFile());
694 PrintQuotedString(Filename, OS);
698 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
700 OS << "\t.file\t" << FileNo << ' ';
701 PrintQuotedString(Filename, OS);
704 return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
707 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
708 unsigned Column, unsigned Flags,
710 unsigned Discriminator) {
711 this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
716 OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
717 if (Flags & DWARF2_FLAG_BASIC_BLOCK)
718 OS << " basic_block";
719 if (Flags & DWARF2_FLAG_PROLOGUE_END)
720 OS << " prologue_end";
721 if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
722 OS << " epilogue_begin";
724 unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
725 if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
728 if (Flags & DWARF2_FLAG_IS_STMT)
737 OS << "discriminator " << Discriminator;
741 bool MCAsmStreamer::EmitCFIStartProc() {
742 if (this->MCStreamer::EmitCFIStartProc())
745 OS << ".cfi_startproc";
751 bool MCAsmStreamer::EmitCFIEndProc() {
752 if (this->MCStreamer::EmitCFIEndProc())
755 OS << ".cfi_endproc";
761 bool MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
762 if (this->MCStreamer::EmitCFIDefCfaOffset(Offset))
765 OS << ".cfi_def_cfa_offset " << Offset;
771 bool MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
772 if (this->MCStreamer::EmitCFIDefCfaRegister(Register))
775 OS << ".cfi_def_cfa_register " << Register;
781 bool MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
782 if (this->MCStreamer::EmitCFIOffset(Register, Offset))
785 OS << ".cfi_offset " << Register << ", " << Offset;
791 bool MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym) {
792 if (this->MCStreamer::EmitCFIPersonality(Sym))
795 OS << ".cfi_personality 0, " << *Sym;
801 bool MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym) {
802 if (this->MCStreamer::EmitCFILsda(Sym))
805 OS << ".cfi_lsda 0, " << *Sym;
811 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
812 raw_ostream &OS = GetCommentOS();
813 SmallString<256> Code;
814 SmallVector<MCFixup, 4> Fixups;
815 raw_svector_ostream VecOS(Code);
816 Emitter->EncodeInstruction(Inst, VecOS, Fixups);
819 // If we are showing fixups, create symbolic markers in the encoded
820 // representation. We do this by making a per-bit map to the fixup item index,
821 // then trying to display it as nicely as possible.
822 SmallVector<uint8_t, 64> FixupMap;
823 FixupMap.resize(Code.size() * 8);
824 for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
827 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
828 MCFixup &F = Fixups[i];
829 const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
830 for (unsigned j = 0; j != Info.TargetSize; ++j) {
831 unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
832 assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
833 FixupMap[Index] = 1 + i;
838 for (unsigned i = 0, e = Code.size(); i != e; ++i) {
842 // See if all bits are the same map entry.
843 uint8_t MapEntry = FixupMap[i * 8 + 0];
844 for (unsigned j = 1; j != 8; ++j) {
845 if (FixupMap[i * 8 + j] == MapEntry)
848 MapEntry = uint8_t(~0U);
852 if (MapEntry != uint8_t(~0U)) {
854 OS << format("0x%02x", uint8_t(Code[i]));
856 assert(Code[i] == 0 && "Encoder wrote into fixed up bit!");
857 OS << char('A' + MapEntry - 1);
860 // Otherwise, write out in binary.
862 for (unsigned j = 8; j--;) {
863 unsigned Bit = (Code[i] >> j) & 1;
867 FixupBit = i * 8 + j;
869 FixupBit = i * 8 + (7-j);
871 if (uint8_t MapEntry = FixupMap[FixupBit]) {
872 assert(Bit == 0 && "Encoder wrote into fixed up bit!");
873 OS << char('A' + MapEntry - 1);
881 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
882 MCFixup &F = Fixups[i];
883 const MCFixupKindInfo &Info = Emitter->getFixupKindInfo(F.getKind());
884 OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
885 << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
889 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
890 assert(CurSection && "Cannot emit contents before setting section!");
893 MCLineEntry::Make(this, getCurrentSection());
895 // Show the encoding in a comment if we have a code emitter.
897 AddEncodingComment(Inst);
899 // Show the MCInst if enabled.
901 Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
902 GetCommentOS() << "\n";
905 // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
907 InstPrinter->printInst(&Inst, OS);
909 Inst.print(OS, &MAI);
913 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
914 /// the specified string in the output .s file. This capability is
915 /// indicated by the hasRawTextSupport() predicate.
916 void MCAsmStreamer::EmitRawText(StringRef String) {
917 if (!String.empty() && String.back() == '\n')
918 String = String.substr(0, String.size()-1);
923 void MCAsmStreamer::Finish() {
924 // Dump out the dwarf file & directory tables and line tables.
925 if (getContext().hasDwarfFiles() && TLOF)
926 MCDwarfFileTable::Emit(this, TLOF->getDwarfLineSection());
929 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
930 formatted_raw_ostream &OS,
932 bool isVerboseAsm, MCInstPrinter *IP,
933 MCCodeEmitter *CE, bool ShowInst) {
934 return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
935 NULL, 0, IP, CE, ShowInst);
939 MCStreamer *llvm::createAsmStreamerNoLoc(MCContext &Context,
940 formatted_raw_ostream &OS,
943 const TargetLoweringObjectFile *TLOF,
946 MCCodeEmitter *CE, bool ShowInst) {
947 return new MCAsmStreamer(Context, OS, isLittleEndian, isVerboseAsm,
948 TLOF, PointerSize, IP, CE, ShowInst);