1 //===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output --------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
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/MCObjectFileInfo.h"
19 #include "llvm/MC/MCRegisterInfo.h"
20 #include "llvm/MC/MCSectionCOFF.h"
21 #include "llvm/MC/MCSectionMachO.h"
22 #include "llvm/MC/MCSymbol.h"
23 #include "llvm/MC/MCAsmBackend.h"
24 #include "llvm/ADT/OwningPtr.h"
25 #include "llvm/ADT/SmallString.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/ADT/Twine.h"
28 #include "llvm/Support/ErrorHandling.h"
29 #include "llvm/Support/MathExtras.h"
30 #include "llvm/Support/Format.h"
31 #include "llvm/Support/FormattedStream.h"
32 #include <cctype>
33 using namespace llvm;
34
35 namespace {
36
37 class MCAsmStreamer : public MCStreamer {
38 protected:
39 formatted_raw_ostream &OS;
40 const MCAsmInfo &MAI;
41 private:
42 OwningPtr<MCInstPrinter> InstPrinter;
43 OwningPtr<MCCodeEmitter> Emitter;
44 OwningPtr<MCAsmBackend> AsmBackend;
45
46 SmallString<128> CommentToEmit;
47 raw_svector_ostream CommentStream;
48
49 unsigned IsVerboseAsm : 1;
50 unsigned ShowInst : 1;
51 unsigned UseLoc : 1;
52 unsigned UseCFI : 1;
53
54 enum EHSymbolFlags { EHGlobal = 1,
55 EHWeakDefinition = 1 << 1,
56 EHPrivateExtern = 1 << 2 };
57 DenseMap<const MCSymbol*, unsigned> FlagMap;
58
59 bool needsSet(const MCExpr *Value);
60
61 void EmitRegisterName(int64_t Register);
62
63 public:
MCAsmStreamer(MCContext & Context,formatted_raw_ostream & os,bool isVerboseAsm,bool useLoc,bool useCFI,MCInstPrinter * printer,MCCodeEmitter * emitter,MCAsmBackend * asmbackend,bool showInst)64 MCAsmStreamer(MCContext &Context, formatted_raw_ostream &os,
65 bool isVerboseAsm, bool useLoc, bool useCFI,
66 MCInstPrinter *printer, MCCodeEmitter *emitter,
67 MCAsmBackend *asmbackend,
68 bool showInst)
69 : MCStreamer(Context), OS(os), MAI(Context.getAsmInfo()),
70 InstPrinter(printer), Emitter(emitter), AsmBackend(asmbackend),
71 CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
72 ShowInst(showInst), UseLoc(useLoc), UseCFI(useCFI) {
73 if (InstPrinter && IsVerboseAsm)
74 InstPrinter->setCommentStream(CommentStream);
75 }
~MCAsmStreamer()76 ~MCAsmStreamer() {}
77
EmitEOL()78 inline void EmitEOL() {
79 // If we don't have any comments, just emit a \n.
80 if (!IsVerboseAsm) {
81 OS << '\n';
82 return;
83 }
84 EmitCommentsAndEOL();
85 }
86 void EmitCommentsAndEOL();
87
88 /// isVerboseAsm - Return true if this streamer supports verbose assembly at
89 /// all.
isVerboseAsm() const90 virtual bool isVerboseAsm() const { return IsVerboseAsm; }
91
92 /// hasRawTextSupport - We support EmitRawText.
hasRawTextSupport() const93 virtual bool hasRawTextSupport() const { return true; }
94
95 /// AddComment - Add a comment that can be emitted to the generated .s
96 /// file if applicable as a QoI issue to make the output of the compiler
97 /// more readable. This only affects the MCAsmStreamer, and only when
98 /// verbose assembly output is enabled.
99 virtual void AddComment(const Twine &T);
100
101 /// AddEncodingComment - Add a comment showing the encoding of an instruction.
102 virtual void AddEncodingComment(const MCInst &Inst);
103
104 /// GetCommentOS - Return a raw_ostream that comments can be written to.
105 /// Unlike AddComment, you are required to terminate comments with \n if you
106 /// use this method.
GetCommentOS()107 virtual raw_ostream &GetCommentOS() {
108 if (!IsVerboseAsm)
109 return nulls(); // Discard comments unless in verbose asm mode.
110 return CommentStream;
111 }
112
113 /// AddBlankLine - Emit a blank line to a .s file to pretty it up.
AddBlankLine()114 virtual void AddBlankLine() {
115 EmitEOL();
116 }
117
118 /// @name MCStreamer Interface
119 /// @{
120
121 virtual void ChangeSection(const MCSection *Section);
122
InitSections()123 virtual void InitSections() {
124 // FIXME, this is MachO specific, but the testsuite
125 // expects this.
126 SwitchSection(getContext().getMachOSection("__TEXT", "__text",
127 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
128 0, SectionKind::getText()));
129 }
130
131 virtual void EmitLabel(MCSymbol *Symbol);
132 virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
133 MCSymbol *EHSymbol);
134 virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
135 virtual void EmitThumbFunc(MCSymbol *Func);
136
137 virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
138 virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
139 virtual void EmitDwarfAdvanceLineAddr(int64_t LineDelta,
140 const MCSymbol *LastLabel,
141 const MCSymbol *Label,
142 unsigned PointerSize);
143 virtual void EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
144 const MCSymbol *Label);
145
146 virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
147
148 virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
149 virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol);
150 virtual void EmitCOFFSymbolStorageClass(int StorageClass);
151 virtual void EmitCOFFSymbolType(int Type);
152 virtual void EndCOFFSymbolDef();
153 virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
154 virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
155 unsigned ByteAlignment);
156
157 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
158 ///
159 /// @param Symbol - The common symbol to emit.
160 /// @param Size - The size of the common symbol.
161 /// @param Size - The alignment of the common symbol in bytes.
162 virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
163 unsigned ByteAlignment);
164
165 virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
166 unsigned Size = 0, unsigned ByteAlignment = 0);
167
168 virtual void EmitTBSSSymbol (const MCSection *Section, MCSymbol *Symbol,
169 uint64_t Size, unsigned ByteAlignment = 0);
170
171 virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
172
173 virtual void EmitValueImpl(const MCExpr *Value, unsigned Size,
174 unsigned AddrSpace);
175 virtual void EmitIntValue(uint64_t Value, unsigned Size,
176 unsigned AddrSpace = 0);
177
178 virtual void EmitULEB128Value(const MCExpr *Value);
179
180 virtual void EmitSLEB128Value(const MCExpr *Value);
181
182 virtual void EmitGPRel32Value(const MCExpr *Value);
183
184
185 virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
186 unsigned AddrSpace);
187
188 virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
189 unsigned ValueSize = 1,
190 unsigned MaxBytesToEmit = 0);
191
192 virtual void EmitCodeAlignment(unsigned ByteAlignment,
193 unsigned MaxBytesToEmit = 0);
194
195 virtual void EmitValueToOffset(const MCExpr *Offset,
196 unsigned char Value = 0);
197
198 virtual void EmitFileDirective(StringRef Filename);
199 virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Filename);
200 virtual void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
201 unsigned Column, unsigned Flags,
202 unsigned Isa, unsigned Discriminator,
203 StringRef FileName);
204
205 virtual void EmitCFISections(bool EH, bool Debug);
206 virtual void EmitCFIStartProc();
207 virtual void EmitCFIEndProc();
208 virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset);
209 virtual void EmitCFIDefCfaOffset(int64_t Offset);
210 virtual void EmitCFIDefCfaRegister(int64_t Register);
211 virtual void EmitCFIOffset(int64_t Register, int64_t Offset);
212 virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
213 virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding);
214 virtual void EmitCFIRememberState();
215 virtual void EmitCFIRestoreState();
216 virtual void EmitCFISameValue(int64_t Register);
217 virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset);
218 virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment);
219
220 virtual void EmitWin64EHStartProc(const MCSymbol *Symbol);
221 virtual void EmitWin64EHEndProc();
222 virtual void EmitWin64EHStartChained();
223 virtual void EmitWin64EHEndChained();
224 virtual void EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
225 bool Except);
226 virtual void EmitWin64EHHandlerData();
227 virtual void EmitWin64EHPushReg(unsigned Register);
228 virtual void EmitWin64EHSetFrame(unsigned Register, unsigned Offset);
229 virtual void EmitWin64EHAllocStack(unsigned Size);
230 virtual void EmitWin64EHSaveReg(unsigned Register, unsigned Offset);
231 virtual void EmitWin64EHSaveXMM(unsigned Register, unsigned Offset);
232 virtual void EmitWin64EHPushFrame(bool Code);
233 virtual void EmitWin64EHEndProlog();
234
235 virtual void EmitFnStart();
236 virtual void EmitFnEnd();
237 virtual void EmitCantUnwind();
238 virtual void EmitPersonality(const MCSymbol *Personality);
239 virtual void EmitHandlerData();
240 virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
241 virtual void EmitPad(int64_t Offset);
242 virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
243
244
245 virtual void EmitInstruction(const MCInst &Inst);
246
247 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
248 /// the specified string in the output .s file. This capability is
249 /// indicated by the hasRawTextSupport() predicate.
250 virtual void EmitRawText(StringRef String);
251
252 virtual void Finish();
253
254 /// @}
255 };
256
257 } // end anonymous namespace.
258
259 /// AddComment - Add a comment that can be emitted to the generated .s
260 /// file if applicable as a QoI issue to make the output of the compiler
261 /// more readable. This only affects the MCAsmStreamer, and only when
262 /// verbose assembly output is enabled.
AddComment(const Twine & T)263 void MCAsmStreamer::AddComment(const Twine &T) {
264 if (!IsVerboseAsm) return;
265
266 // Make sure that CommentStream is flushed.
267 CommentStream.flush();
268
269 T.toVector(CommentToEmit);
270 // Each comment goes on its own line.
271 CommentToEmit.push_back('\n');
272
273 // Tell the comment stream that the vector changed underneath it.
274 CommentStream.resync();
275 }
276
EmitCommentsAndEOL()277 void MCAsmStreamer::EmitCommentsAndEOL() {
278 if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
279 OS << '\n';
280 return;
281 }
282
283 CommentStream.flush();
284 StringRef Comments = CommentToEmit.str();
285
286 assert(Comments.back() == '\n' &&
287 "Comment array not newline terminated");
288 do {
289 // Emit a line of comments.
290 OS.PadToColumn(MAI.getCommentColumn());
291 size_t Position = Comments.find('\n');
292 OS << MAI.getCommentString() << ' ' << Comments.substr(0, Position) << '\n';
293
294 Comments = Comments.substr(Position+1);
295 } while (!Comments.empty());
296
297 CommentToEmit.clear();
298 // Tell the comment stream that the vector changed underneath it.
299 CommentStream.resync();
300 }
301
truncateToSize(int64_t Value,unsigned Bytes)302 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
303 assert(Bytes && "Invalid size!");
304 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
305 }
306
ChangeSection(const MCSection * Section)307 void MCAsmStreamer::ChangeSection(const MCSection *Section) {
308 assert(Section && "Cannot switch to a null section!");
309 Section->PrintSwitchToSection(MAI, OS);
310 }
311
EmitEHSymAttributes(const MCSymbol * Symbol,MCSymbol * EHSymbol)312 void MCAsmStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
313 MCSymbol *EHSymbol) {
314 if (UseCFI)
315 return;
316
317 unsigned Flags = FlagMap.lookup(Symbol);
318
319 if (Flags & EHGlobal)
320 EmitSymbolAttribute(EHSymbol, MCSA_Global);
321 if (Flags & EHWeakDefinition)
322 EmitSymbolAttribute(EHSymbol, MCSA_WeakDefinition);
323 if (Flags & EHPrivateExtern)
324 EmitSymbolAttribute(EHSymbol, MCSA_PrivateExtern);
325 }
326
EmitLabel(MCSymbol * Symbol)327 void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
328 assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
329 MCStreamer::EmitLabel(Symbol);
330
331 OS << *Symbol << MAI.getLabelSuffix();
332 EmitEOL();
333 }
334
EmitAssemblerFlag(MCAssemblerFlag Flag)335 void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
336 switch (Flag) {
337 default: assert(0 && "Invalid flag!");
338 case MCAF_SyntaxUnified: OS << "\t.syntax unified"; break;
339 case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
340 case MCAF_Code16: OS << '\t'<< MAI.getCode16Directive(); break;
341 case MCAF_Code32: OS << '\t'<< MAI.getCode32Directive(); break;
342 case MCAF_Code64: OS << '\t'<< MAI.getCode64Directive(); break;
343 }
344 EmitEOL();
345 }
346
EmitThumbFunc(MCSymbol * Func)347 void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
348 // This needs to emit to a temporary string to get properly quoted
349 // MCSymbols when they have spaces in them.
350 OS << "\t.thumb_func";
351 // Only Mach-O hasSubsectionsViaSymbols()
352 if (MAI.hasSubsectionsViaSymbols())
353 OS << '\t' << *Func;
354 EmitEOL();
355 }
356
EmitAssignment(MCSymbol * Symbol,const MCExpr * Value)357 void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
358 OS << *Symbol << " = " << *Value;
359 EmitEOL();
360
361 // FIXME: Lift context changes into super class.
362 Symbol->setVariableValue(Value);
363 }
364
EmitWeakReference(MCSymbol * Alias,const MCSymbol * Symbol)365 void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
366 OS << ".weakref " << *Alias << ", " << *Symbol;
367 EmitEOL();
368 }
369
EmitDwarfAdvanceLineAddr(int64_t LineDelta,const MCSymbol * LastLabel,const MCSymbol * Label,unsigned PointerSize)370 void MCAsmStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
371 const MCSymbol *LastLabel,
372 const MCSymbol *Label,
373 unsigned PointerSize) {
374 EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
375 }
376
EmitDwarfAdvanceFrameAddr(const MCSymbol * LastLabel,const MCSymbol * Label)377 void MCAsmStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
378 const MCSymbol *Label) {
379 EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
380 const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
381 AddrDelta = ForceExpAbs(AddrDelta);
382 EmitValue(AddrDelta, 4);
383 }
384
385
EmitSymbolAttribute(MCSymbol * Symbol,MCSymbolAttr Attribute)386 void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
387 MCSymbolAttr Attribute) {
388 switch (Attribute) {
389 case MCSA_Invalid: assert(0 && "Invalid symbol attribute");
390 case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC # aka @function
391 case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
392 case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT # aka @object
393 case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS # aka @tls_object
394 case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON # aka @common
395 case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE # aka @notype
396 case MCSA_ELF_TypeGnuUniqueObject: /// .type _foo, @gnu_unique_object
397 assert(MAI.hasDotTypeDotSizeDirective() && "Symbol Attr not supported");
398 OS << "\t.type\t" << *Symbol << ','
399 << ((MAI.getCommentString()[0] != '@') ? '@' : '%');
400 switch (Attribute) {
401 default: assert(0 && "Unknown ELF .type");
402 case MCSA_ELF_TypeFunction: OS << "function"; break;
403 case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
404 case MCSA_ELF_TypeObject: OS << "object"; break;
405 case MCSA_ELF_TypeTLS: OS << "tls_object"; break;
406 case MCSA_ELF_TypeCommon: OS << "common"; break;
407 case MCSA_ELF_TypeNoType: OS << "no_type"; break;
408 case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
409 }
410 EmitEOL();
411 return;
412 case MCSA_Global: // .globl/.global
413 OS << MAI.getGlobalDirective();
414 FlagMap[Symbol] |= EHGlobal;
415 break;
416 case MCSA_Hidden: OS << "\t.hidden\t"; break;
417 case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
418 case MCSA_Internal: OS << "\t.internal\t"; break;
419 case MCSA_LazyReference: OS << "\t.lazy_reference\t"; break;
420 case MCSA_Local: OS << "\t.local\t"; break;
421 case MCSA_NoDeadStrip: OS << "\t.no_dead_strip\t"; break;
422 case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
423 case MCSA_PrivateExtern:
424 OS << "\t.private_extern\t";
425 FlagMap[Symbol] |= EHPrivateExtern;
426 break;
427 case MCSA_Protected: OS << "\t.protected\t"; break;
428 case MCSA_Reference: OS << "\t.reference\t"; break;
429 case MCSA_Weak: OS << "\t.weak\t"; break;
430 case MCSA_WeakDefinition:
431 OS << "\t.weak_definition\t";
432 FlagMap[Symbol] |= EHWeakDefinition;
433 break;
434 // .weak_reference
435 case MCSA_WeakReference: OS << MAI.getWeakRefDirective(); break;
436 case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
437 }
438
439 OS << *Symbol;
440 EmitEOL();
441 }
442
EmitSymbolDesc(MCSymbol * Symbol,unsigned DescValue)443 void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
444 OS << ".desc" << ' ' << *Symbol << ',' << DescValue;
445 EmitEOL();
446 }
447
BeginCOFFSymbolDef(const MCSymbol * Symbol)448 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
449 OS << "\t.def\t " << *Symbol << ';';
450 EmitEOL();
451 }
452
EmitCOFFSymbolStorageClass(int StorageClass)453 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
454 OS << "\t.scl\t" << StorageClass << ';';
455 EmitEOL();
456 }
457
EmitCOFFSymbolType(int Type)458 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
459 OS << "\t.type\t" << Type << ';';
460 EmitEOL();
461 }
462
EndCOFFSymbolDef()463 void MCAsmStreamer::EndCOFFSymbolDef() {
464 OS << "\t.endef";
465 EmitEOL();
466 }
467
EmitELFSize(MCSymbol * Symbol,const MCExpr * Value)468 void MCAsmStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
469 assert(MAI.hasDotTypeDotSizeDirective());
470 OS << "\t.size\t" << *Symbol << ", " << *Value << '\n';
471 }
472
EmitCommonSymbol(MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)473 void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
474 unsigned ByteAlignment) {
475 OS << "\t.comm\t" << *Symbol << ',' << Size;
476 if (ByteAlignment != 0) {
477 if (MAI.getCOMMDirectiveAlignmentIsInBytes())
478 OS << ',' << ByteAlignment;
479 else
480 OS << ',' << Log2_32(ByteAlignment);
481 }
482 EmitEOL();
483 }
484
485 /// EmitLocalCommonSymbol - Emit a local common (.lcomm) symbol.
486 ///
487 /// @param Symbol - The common symbol to emit.
488 /// @param Size - The size of the common symbol.
EmitLocalCommonSymbol(MCSymbol * Symbol,uint64_t Size,unsigned ByteAlign)489 void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
490 unsigned ByteAlign) {
491 assert(MAI.getLCOMMDirectiveType() != LCOMM::None &&
492 "Doesn't have .lcomm, can't emit it!");
493 OS << "\t.lcomm\t" << *Symbol << ',' << Size;
494 if (ByteAlign > 1) {
495 assert(MAI.getLCOMMDirectiveType() == LCOMM::ByteAlignment &&
496 "Alignment not supported on .lcomm!");
497 OS << ',' << ByteAlign;
498 }
499 EmitEOL();
500 }
501
EmitZerofill(const MCSection * Section,MCSymbol * Symbol,unsigned Size,unsigned ByteAlignment)502 void MCAsmStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
503 unsigned Size, unsigned ByteAlignment) {
504 // Note: a .zerofill directive does not switch sections.
505 OS << ".zerofill ";
506
507 // This is a mach-o specific directive.
508 const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
509 OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
510
511 if (Symbol != NULL) {
512 OS << ',' << *Symbol << ',' << Size;
513 if (ByteAlignment != 0)
514 OS << ',' << Log2_32(ByteAlignment);
515 }
516 EmitEOL();
517 }
518
519 // .tbss sym, size, align
520 // This depends that the symbol has already been mangled from the original,
521 // e.g. _a.
EmitTBSSSymbol(const MCSection * Section,MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)522 void MCAsmStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
523 uint64_t Size, unsigned ByteAlignment) {
524 assert(Symbol != NULL && "Symbol shouldn't be NULL!");
525 // Instead of using the Section we'll just use the shortcut.
526 // This is a mach-o specific directive and section.
527 OS << ".tbss " << *Symbol << ", " << Size;
528
529 // Output align if we have it. We default to 1 so don't bother printing
530 // that.
531 if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
532
533 EmitEOL();
534 }
535
toOctal(int X)536 static inline char toOctal(int X) { return (X&7)+'0'; }
537
PrintQuotedString(StringRef Data,raw_ostream & OS)538 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
539 OS << '"';
540
541 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
542 unsigned char C = Data[i];
543 if (C == '"' || C == '\\') {
544 OS << '\\' << (char)C;
545 continue;
546 }
547
548 if (isprint((unsigned char)C)) {
549 OS << (char)C;
550 continue;
551 }
552
553 switch (C) {
554 case '\b': OS << "\\b"; break;
555 case '\f': OS << "\\f"; break;
556 case '\n': OS << "\\n"; break;
557 case '\r': OS << "\\r"; break;
558 case '\t': OS << "\\t"; break;
559 default:
560 OS << '\\';
561 OS << toOctal(C >> 6);
562 OS << toOctal(C >> 3);
563 OS << toOctal(C >> 0);
564 break;
565 }
566 }
567
568 OS << '"';
569 }
570
571
EmitBytes(StringRef Data,unsigned AddrSpace)572 void MCAsmStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
573 assert(getCurrentSection() && "Cannot emit contents before setting section!");
574 if (Data.empty()) return;
575
576 if (Data.size() == 1) {
577 OS << MAI.getData8bitsDirective(AddrSpace);
578 OS << (unsigned)(unsigned char)Data[0];
579 EmitEOL();
580 return;
581 }
582
583 // If the data ends with 0 and the target supports .asciz, use it, otherwise
584 // use .ascii
585 if (MAI.getAscizDirective() && Data.back() == 0) {
586 OS << MAI.getAscizDirective();
587 Data = Data.substr(0, Data.size()-1);
588 } else {
589 OS << MAI.getAsciiDirective();
590 }
591
592 OS << ' ';
593 PrintQuotedString(Data, OS);
594 EmitEOL();
595 }
596
EmitIntValue(uint64_t Value,unsigned Size,unsigned AddrSpace)597 void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size,
598 unsigned AddrSpace) {
599 EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
600 }
601
EmitValueImpl(const MCExpr * Value,unsigned Size,unsigned AddrSpace)602 void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
603 unsigned AddrSpace) {
604 assert(getCurrentSection() && "Cannot emit contents before setting section!");
605 const char *Directive = 0;
606 switch (Size) {
607 default: break;
608 case 1: Directive = MAI.getData8bitsDirective(AddrSpace); break;
609 case 2: Directive = MAI.getData16bitsDirective(AddrSpace); break;
610 case 4: Directive = MAI.getData32bitsDirective(AddrSpace); break;
611 case 8:
612 Directive = MAI.getData64bitsDirective(AddrSpace);
613 // If the target doesn't support 64-bit data, emit as two 32-bit halves.
614 if (Directive) break;
615 int64_t IntValue;
616 if (!Value->EvaluateAsAbsolute(IntValue))
617 report_fatal_error("Don't know how to emit this value.");
618 if (getContext().getAsmInfo().isLittleEndian()) {
619 EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
620 EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
621 } else {
622 EmitIntValue((uint32_t)(IntValue >> 32), 4, AddrSpace);
623 EmitIntValue((uint32_t)(IntValue >> 0 ), 4, AddrSpace);
624 }
625 return;
626 }
627
628 assert(Directive && "Invalid size for machine code value!");
629 OS << Directive << *Value;
630 EmitEOL();
631 }
632
EmitULEB128Value(const MCExpr * Value)633 void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
634 int64_t IntValue;
635 if (Value->EvaluateAsAbsolute(IntValue)) {
636 EmitULEB128IntValue(IntValue);
637 return;
638 }
639 assert(MAI.hasLEB128() && "Cannot print a .uleb");
640 OS << ".uleb128 " << *Value;
641 EmitEOL();
642 }
643
EmitSLEB128Value(const MCExpr * Value)644 void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
645 int64_t IntValue;
646 if (Value->EvaluateAsAbsolute(IntValue)) {
647 EmitSLEB128IntValue(IntValue);
648 return;
649 }
650 assert(MAI.hasLEB128() && "Cannot print a .sleb");
651 OS << ".sleb128 " << *Value;
652 EmitEOL();
653 }
654
EmitGPRel32Value(const MCExpr * Value)655 void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
656 assert(MAI.getGPRel32Directive() != 0);
657 OS << MAI.getGPRel32Directive() << *Value;
658 EmitEOL();
659 }
660
661
662 /// EmitFill - Emit NumBytes bytes worth of the value specified by
663 /// FillValue. This implements directives such as '.space'.
EmitFill(uint64_t NumBytes,uint8_t FillValue,unsigned AddrSpace)664 void MCAsmStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
665 unsigned AddrSpace) {
666 if (NumBytes == 0) return;
667
668 if (AddrSpace == 0)
669 if (const char *ZeroDirective = MAI.getZeroDirective()) {
670 OS << ZeroDirective << NumBytes;
671 if (FillValue != 0)
672 OS << ',' << (int)FillValue;
673 EmitEOL();
674 return;
675 }
676
677 // Emit a byte at a time.
678 MCStreamer::EmitFill(NumBytes, FillValue, AddrSpace);
679 }
680
EmitValueToAlignment(unsigned ByteAlignment,int64_t Value,unsigned ValueSize,unsigned MaxBytesToEmit)681 void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
682 unsigned ValueSize,
683 unsigned MaxBytesToEmit) {
684 // Some assemblers don't support non-power of two alignments, so we always
685 // emit alignments as a power of two if possible.
686 if (isPowerOf2_32(ByteAlignment)) {
687 switch (ValueSize) {
688 default: llvm_unreachable("Invalid size for machine code value!");
689 case 1: OS << MAI.getAlignDirective(); break;
690 // FIXME: use MAI for this!
691 case 2: OS << ".p2alignw "; break;
692 case 4: OS << ".p2alignl "; break;
693 case 8: llvm_unreachable("Unsupported alignment size!");
694 }
695
696 if (MAI.getAlignmentIsInBytes())
697 OS << ByteAlignment;
698 else
699 OS << Log2_32(ByteAlignment);
700
701 if (Value || MaxBytesToEmit) {
702 OS << ", 0x";
703 OS.write_hex(truncateToSize(Value, ValueSize));
704
705 if (MaxBytesToEmit)
706 OS << ", " << MaxBytesToEmit;
707 }
708 EmitEOL();
709 return;
710 }
711
712 // Non-power of two alignment. This is not widely supported by assemblers.
713 // FIXME: Parameterize this based on MAI.
714 switch (ValueSize) {
715 default: llvm_unreachable("Invalid size for machine code value!");
716 case 1: OS << ".balign"; break;
717 case 2: OS << ".balignw"; break;
718 case 4: OS << ".balignl"; break;
719 case 8: llvm_unreachable("Unsupported alignment size!");
720 }
721
722 OS << ' ' << ByteAlignment;
723 OS << ", " << truncateToSize(Value, ValueSize);
724 if (MaxBytesToEmit)
725 OS << ", " << MaxBytesToEmit;
726 EmitEOL();
727 }
728
EmitCodeAlignment(unsigned ByteAlignment,unsigned MaxBytesToEmit)729 void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
730 unsigned MaxBytesToEmit) {
731 // Emit with a text fill value.
732 EmitValueToAlignment(ByteAlignment, MAI.getTextAlignFillValue(),
733 1, MaxBytesToEmit);
734 }
735
EmitValueToOffset(const MCExpr * Offset,unsigned char Value)736 void MCAsmStreamer::EmitValueToOffset(const MCExpr *Offset,
737 unsigned char Value) {
738 // FIXME: Verify that Offset is associated with the current section.
739 OS << ".org " << *Offset << ", " << (unsigned) Value;
740 EmitEOL();
741 }
742
743
EmitFileDirective(StringRef Filename)744 void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
745 assert(MAI.hasSingleParameterDotFile());
746 OS << "\t.file\t";
747 PrintQuotedString(Filename, OS);
748 EmitEOL();
749 }
750
EmitDwarfFileDirective(unsigned FileNo,StringRef Filename)751 bool MCAsmStreamer::EmitDwarfFileDirective(unsigned FileNo, StringRef Filename){
752 if (UseLoc) {
753 OS << "\t.file\t" << FileNo << ' ';
754 PrintQuotedString(Filename, OS);
755 EmitEOL();
756 }
757 return this->MCStreamer::EmitDwarfFileDirective(FileNo, Filename);
758 }
759
EmitDwarfLocDirective(unsigned FileNo,unsigned Line,unsigned Column,unsigned Flags,unsigned Isa,unsigned Discriminator,StringRef FileName)760 void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
761 unsigned Column, unsigned Flags,
762 unsigned Isa,
763 unsigned Discriminator,
764 StringRef FileName) {
765 this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
766 Isa, Discriminator, FileName);
767 if (!UseLoc)
768 return;
769
770 OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
771 if (Flags & DWARF2_FLAG_BASIC_BLOCK)
772 OS << " basic_block";
773 if (Flags & DWARF2_FLAG_PROLOGUE_END)
774 OS << " prologue_end";
775 if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
776 OS << " epilogue_begin";
777
778 unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
779 if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
780 OS << " is_stmt ";
781
782 if (Flags & DWARF2_FLAG_IS_STMT)
783 OS << "1";
784 else
785 OS << "0";
786 }
787
788 if (Isa)
789 OS << "isa " << Isa;
790 if (Discriminator)
791 OS << "discriminator " << Discriminator;
792
793 if (IsVerboseAsm) {
794 OS.PadToColumn(MAI.getCommentColumn());
795 OS << MAI.getCommentString() << ' ' << FileName << ':'
796 << Line << ':' << Column;
797 }
798 EmitEOL();
799 }
800
EmitCFISections(bool EH,bool Debug)801 void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
802 MCStreamer::EmitCFISections(EH, Debug);
803
804 if (!UseCFI)
805 return;
806
807 OS << "\t.cfi_sections ";
808 if (EH) {
809 OS << ".eh_frame";
810 if (Debug)
811 OS << ", .debug_frame";
812 } else if (Debug) {
813 OS << ".debug_frame";
814 }
815
816 EmitEOL();
817 }
818
EmitCFIStartProc()819 void MCAsmStreamer::EmitCFIStartProc() {
820 MCStreamer::EmitCFIStartProc();
821
822 if (!UseCFI)
823 return;
824
825 OS << "\t.cfi_startproc";
826 EmitEOL();
827 }
828
EmitCFIEndProc()829 void MCAsmStreamer::EmitCFIEndProc() {
830 MCStreamer::EmitCFIEndProc();
831
832 if (!UseCFI)
833 return;
834
835 OS << "\t.cfi_endproc";
836 EmitEOL();
837 }
838
EmitRegisterName(int64_t Register)839 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
840 if (InstPrinter && !MAI.useDwarfRegNumForCFI()) {
841 const MCRegisterInfo &MRI = getContext().getRegisterInfo();
842 unsigned LLVMRegister = MRI.getLLVMRegNum(Register, true);
843 InstPrinter->printRegName(OS, LLVMRegister);
844 } else {
845 OS << Register;
846 }
847 }
848
EmitCFIDefCfa(int64_t Register,int64_t Offset)849 void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
850 MCStreamer::EmitCFIDefCfa(Register, Offset);
851
852 if (!UseCFI)
853 return;
854
855 OS << "\t.cfi_def_cfa ";
856 EmitRegisterName(Register);
857 OS << ", " << Offset;
858 EmitEOL();
859 }
860
EmitCFIDefCfaOffset(int64_t Offset)861 void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
862 MCStreamer::EmitCFIDefCfaOffset(Offset);
863
864 if (!UseCFI)
865 return;
866
867 OS << "\t.cfi_def_cfa_offset " << Offset;
868 EmitEOL();
869 }
870
EmitCFIDefCfaRegister(int64_t Register)871 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
872 MCStreamer::EmitCFIDefCfaRegister(Register);
873
874 if (!UseCFI)
875 return;
876
877 OS << "\t.cfi_def_cfa_register ";
878 EmitRegisterName(Register);
879 EmitEOL();
880 }
881
EmitCFIOffset(int64_t Register,int64_t Offset)882 void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
883 this->MCStreamer::EmitCFIOffset(Register, Offset);
884
885 if (!UseCFI)
886 return;
887
888 OS << "\t.cfi_offset ";
889 EmitRegisterName(Register);
890 OS << ", " << Offset;
891 EmitEOL();
892 }
893
EmitCFIPersonality(const MCSymbol * Sym,unsigned Encoding)894 void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
895 unsigned Encoding) {
896 MCStreamer::EmitCFIPersonality(Sym, Encoding);
897
898 if (!UseCFI)
899 return;
900
901 OS << "\t.cfi_personality " << Encoding << ", " << *Sym;
902 EmitEOL();
903 }
904
EmitCFILsda(const MCSymbol * Sym,unsigned Encoding)905 void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
906 MCStreamer::EmitCFILsda(Sym, Encoding);
907
908 if (!UseCFI)
909 return;
910
911 OS << "\t.cfi_lsda " << Encoding << ", " << *Sym;
912 EmitEOL();
913 }
914
EmitCFIRememberState()915 void MCAsmStreamer::EmitCFIRememberState() {
916 MCStreamer::EmitCFIRememberState();
917
918 if (!UseCFI)
919 return;
920
921 OS << "\t.cfi_remember_state";
922 EmitEOL();
923 }
924
EmitCFIRestoreState()925 void MCAsmStreamer::EmitCFIRestoreState() {
926 MCStreamer::EmitCFIRestoreState();
927
928 if (!UseCFI)
929 return;
930
931 OS << "\t.cfi_restore_state";
932 EmitEOL();
933 }
934
EmitCFISameValue(int64_t Register)935 void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
936 MCStreamer::EmitCFISameValue(Register);
937
938 if (!UseCFI)
939 return;
940
941 OS << "\t.cfi_same_value ";
942 EmitRegisterName(Register);
943 EmitEOL();
944 }
945
EmitCFIRelOffset(int64_t Register,int64_t Offset)946 void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
947 MCStreamer::EmitCFIRelOffset(Register, Offset);
948
949 if (!UseCFI)
950 return;
951
952 OS << "\t.cfi_rel_offset ";
953 EmitRegisterName(Register);
954 OS << ", " << Offset;
955 EmitEOL();
956 }
957
EmitCFIAdjustCfaOffset(int64_t Adjustment)958 void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
959 MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
960
961 if (!UseCFI)
962 return;
963
964 OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
965 EmitEOL();
966 }
967
EmitWin64EHStartProc(const MCSymbol * Symbol)968 void MCAsmStreamer::EmitWin64EHStartProc(const MCSymbol *Symbol) {
969 MCStreamer::EmitWin64EHStartProc(Symbol);
970
971 OS << ".seh_proc " << *Symbol;
972 EmitEOL();
973 }
974
EmitWin64EHEndProc()975 void MCAsmStreamer::EmitWin64EHEndProc() {
976 MCStreamer::EmitWin64EHEndProc();
977
978 OS << "\t.seh_endproc";
979 EmitEOL();
980 }
981
EmitWin64EHStartChained()982 void MCAsmStreamer::EmitWin64EHStartChained() {
983 MCStreamer::EmitWin64EHStartChained();
984
985 OS << "\t.seh_startchained";
986 EmitEOL();
987 }
988
EmitWin64EHEndChained()989 void MCAsmStreamer::EmitWin64EHEndChained() {
990 MCStreamer::EmitWin64EHEndChained();
991
992 OS << "\t.seh_endchained";
993 EmitEOL();
994 }
995
EmitWin64EHHandler(const MCSymbol * Sym,bool Unwind,bool Except)996 void MCAsmStreamer::EmitWin64EHHandler(const MCSymbol *Sym, bool Unwind,
997 bool Except) {
998 MCStreamer::EmitWin64EHHandler(Sym, Unwind, Except);
999
1000 OS << "\t.seh_handler " << *Sym;
1001 if (Unwind)
1002 OS << ", @unwind";
1003 if (Except)
1004 OS << ", @except";
1005 EmitEOL();
1006 }
1007
getWin64EHTableSection(StringRef suffix,MCContext & context)1008 static const MCSection *getWin64EHTableSection(StringRef suffix,
1009 MCContext &context) {
1010 // FIXME: This doesn't belong in MCObjectFileInfo. However,
1011 /// this duplicate code in MCWin64EH.cpp.
1012 if (suffix == "")
1013 return context.getObjectFileInfo()->getXDataSection();
1014 return context.getCOFFSection((".xdata"+suffix).str(),
1015 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
1016 COFF::IMAGE_SCN_MEM_READ |
1017 COFF::IMAGE_SCN_MEM_WRITE,
1018 SectionKind::getDataRel());
1019 }
1020
EmitWin64EHHandlerData()1021 void MCAsmStreamer::EmitWin64EHHandlerData() {
1022 MCStreamer::EmitWin64EHHandlerData();
1023
1024 // Switch sections. Don't call SwitchSection directly, because that will
1025 // cause the section switch to be visible in the emitted assembly.
1026 // We only do this so the section switch that terminates the handler
1027 // data block is visible.
1028 MCWin64EHUnwindInfo *CurFrame = getCurrentW64UnwindInfo();
1029 StringRef suffix=MCWin64EHUnwindEmitter::GetSectionSuffix(CurFrame->Function);
1030 const MCSection *xdataSect = getWin64EHTableSection(suffix, getContext());
1031 if (xdataSect)
1032 SwitchSectionNoChange(xdataSect);
1033
1034 OS << "\t.seh_handlerdata";
1035 EmitEOL();
1036 }
1037
EmitWin64EHPushReg(unsigned Register)1038 void MCAsmStreamer::EmitWin64EHPushReg(unsigned Register) {
1039 MCStreamer::EmitWin64EHPushReg(Register);
1040
1041 OS << "\t.seh_pushreg " << Register;
1042 EmitEOL();
1043 }
1044
EmitWin64EHSetFrame(unsigned Register,unsigned Offset)1045 void MCAsmStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) {
1046 MCStreamer::EmitWin64EHSetFrame(Register, Offset);
1047
1048 OS << "\t.seh_setframe " << Register << ", " << Offset;
1049 EmitEOL();
1050 }
1051
EmitWin64EHAllocStack(unsigned Size)1052 void MCAsmStreamer::EmitWin64EHAllocStack(unsigned Size) {
1053 MCStreamer::EmitWin64EHAllocStack(Size);
1054
1055 OS << "\t.seh_stackalloc " << Size;
1056 EmitEOL();
1057 }
1058
EmitWin64EHSaveReg(unsigned Register,unsigned Offset)1059 void MCAsmStreamer::EmitWin64EHSaveReg(unsigned Register, unsigned Offset) {
1060 MCStreamer::EmitWin64EHSaveReg(Register, Offset);
1061
1062 OS << "\t.seh_savereg " << Register << ", " << Offset;
1063 EmitEOL();
1064 }
1065
EmitWin64EHSaveXMM(unsigned Register,unsigned Offset)1066 void MCAsmStreamer::EmitWin64EHSaveXMM(unsigned Register, unsigned Offset) {
1067 MCStreamer::EmitWin64EHSaveXMM(Register, Offset);
1068
1069 OS << "\t.seh_savexmm " << Register << ", " << Offset;
1070 EmitEOL();
1071 }
1072
EmitWin64EHPushFrame(bool Code)1073 void MCAsmStreamer::EmitWin64EHPushFrame(bool Code) {
1074 MCStreamer::EmitWin64EHPushFrame(Code);
1075
1076 OS << "\t.seh_pushframe";
1077 if (Code)
1078 OS << " @code";
1079 EmitEOL();
1080 }
1081
EmitWin64EHEndProlog(void)1082 void MCAsmStreamer::EmitWin64EHEndProlog(void) {
1083 MCStreamer::EmitWin64EHEndProlog();
1084
1085 OS << "\t.seh_endprologue";
1086 EmitEOL();
1087 }
1088
AddEncodingComment(const MCInst & Inst)1089 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst) {
1090 raw_ostream &OS = GetCommentOS();
1091 SmallString<256> Code;
1092 SmallVector<MCFixup, 4> Fixups;
1093 raw_svector_ostream VecOS(Code);
1094 Emitter->EncodeInstruction(Inst, VecOS, Fixups);
1095 VecOS.flush();
1096
1097 // If we are showing fixups, create symbolic markers in the encoded
1098 // representation. We do this by making a per-bit map to the fixup item index,
1099 // then trying to display it as nicely as possible.
1100 SmallVector<uint8_t, 64> FixupMap;
1101 FixupMap.resize(Code.size() * 8);
1102 for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1103 FixupMap[i] = 0;
1104
1105 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1106 MCFixup &F = Fixups[i];
1107 const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1108 for (unsigned j = 0; j != Info.TargetSize; ++j) {
1109 unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1110 assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1111 FixupMap[Index] = 1 + i;
1112 }
1113 }
1114
1115 // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1116 // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1117 OS << "encoding: [";
1118 for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1119 if (i)
1120 OS << ',';
1121
1122 // See if all bits are the same map entry.
1123 uint8_t MapEntry = FixupMap[i * 8 + 0];
1124 for (unsigned j = 1; j != 8; ++j) {
1125 if (FixupMap[i * 8 + j] == MapEntry)
1126 continue;
1127
1128 MapEntry = uint8_t(~0U);
1129 break;
1130 }
1131
1132 if (MapEntry != uint8_t(~0U)) {
1133 if (MapEntry == 0) {
1134 OS << format("0x%02x", uint8_t(Code[i]));
1135 } else {
1136 if (Code[i]) {
1137 // FIXME: Some of the 8 bits require fix up.
1138 OS << format("0x%02x", uint8_t(Code[i])) << '\''
1139 << char('A' + MapEntry - 1) << '\'';
1140 } else
1141 OS << char('A' + MapEntry - 1);
1142 }
1143 } else {
1144 // Otherwise, write out in binary.
1145 OS << "0b";
1146 for (unsigned j = 8; j--;) {
1147 unsigned Bit = (Code[i] >> j) & 1;
1148
1149 unsigned FixupBit;
1150 if (getContext().getAsmInfo().isLittleEndian())
1151 FixupBit = i * 8 + j;
1152 else
1153 FixupBit = i * 8 + (7-j);
1154
1155 if (uint8_t MapEntry = FixupMap[FixupBit]) {
1156 assert(Bit == 0 && "Encoder wrote into fixed up bit!");
1157 OS << char('A' + MapEntry - 1);
1158 } else
1159 OS << Bit;
1160 }
1161 }
1162 }
1163 OS << "]\n";
1164
1165 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1166 MCFixup &F = Fixups[i];
1167 const MCFixupKindInfo &Info = AsmBackend->getFixupKindInfo(F.getKind());
1168 OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
1169 << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
1170 }
1171 }
1172
EmitFnStart()1173 void MCAsmStreamer::EmitFnStart() {
1174 OS << "\t.fnstart";
1175 EmitEOL();
1176 }
1177
EmitFnEnd()1178 void MCAsmStreamer::EmitFnEnd() {
1179 OS << "\t.fnend";
1180 EmitEOL();
1181 }
1182
EmitCantUnwind()1183 void MCAsmStreamer::EmitCantUnwind() {
1184 OS << "\t.cantunwind";
1185 EmitEOL();
1186 }
1187
EmitHandlerData()1188 void MCAsmStreamer::EmitHandlerData() {
1189 OS << "\t.handlerdata";
1190 EmitEOL();
1191 }
1192
EmitPersonality(const MCSymbol * Personality)1193 void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
1194 OS << "\t.personality " << Personality->getName();
1195 EmitEOL();
1196 }
1197
EmitSetFP(unsigned FpReg,unsigned SpReg,int64_t Offset)1198 void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
1199 OS << "\t.setfp\t";
1200 InstPrinter->printRegName(OS, FpReg);
1201 OS << ", ";
1202 InstPrinter->printRegName(OS, SpReg);
1203 if (Offset)
1204 OS << ", #" << Offset;
1205 EmitEOL();
1206 }
1207
EmitPad(int64_t Offset)1208 void MCAsmStreamer::EmitPad(int64_t Offset) {
1209 OS << "\t.pad\t#" << Offset;
1210 EmitEOL();
1211 }
1212
EmitRegSave(const SmallVectorImpl<unsigned> & RegList,bool isVector)1213 void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
1214 bool isVector) {
1215 assert(RegList.size() && "RegList should not be empty");
1216 if (isVector)
1217 OS << "\t.vsave\t{";
1218 else
1219 OS << "\t.save\t{";
1220
1221 InstPrinter->printRegName(OS, RegList[0]);
1222
1223 for (unsigned i = 1, e = RegList.size(); i != e; ++i) {
1224 OS << ", ";
1225 InstPrinter->printRegName(OS, RegList[i]);
1226 }
1227
1228 OS << "}";
1229 EmitEOL();
1230 }
1231
EmitInstruction(const MCInst & Inst)1232 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
1233 assert(getCurrentSection() && "Cannot emit contents before setting section!");
1234
1235 // Show the encoding in a comment if we have a code emitter.
1236 if (Emitter)
1237 AddEncodingComment(Inst);
1238
1239 // Show the MCInst if enabled.
1240 if (ShowInst) {
1241 Inst.dump_pretty(GetCommentOS(), &MAI, InstPrinter.get(), "\n ");
1242 GetCommentOS() << "\n";
1243 }
1244
1245 // If we have an AsmPrinter, use that to print, otherwise print the MCInst.
1246 if (InstPrinter)
1247 InstPrinter->printInst(&Inst, OS, "");
1248 else
1249 Inst.print(OS, &MAI);
1250 EmitEOL();
1251 }
1252
1253 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
1254 /// the specified string in the output .s file. This capability is
1255 /// indicated by the hasRawTextSupport() predicate.
EmitRawText(StringRef String)1256 void MCAsmStreamer::EmitRawText(StringRef String) {
1257 if (!String.empty() && String.back() == '\n')
1258 String = String.substr(0, String.size()-1);
1259 OS << String;
1260 EmitEOL();
1261 }
1262
Finish()1263 void MCAsmStreamer::Finish() {
1264 // Dump out the dwarf file & directory tables and line tables.
1265 if (getContext().hasDwarfFiles() && !UseLoc)
1266 MCDwarfFileTable::Emit(this);
1267
1268 if (!UseCFI)
1269 EmitFrames(false);
1270 }
createAsmStreamer(MCContext & Context,formatted_raw_ostream & OS,bool isVerboseAsm,bool useLoc,bool useCFI,MCInstPrinter * IP,MCCodeEmitter * CE,MCAsmBackend * MAB,bool ShowInst)1271 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
1272 formatted_raw_ostream &OS,
1273 bool isVerboseAsm, bool useLoc,
1274 bool useCFI, MCInstPrinter *IP,
1275 MCCodeEmitter *CE, MCAsmBackend *MAB,
1276 bool ShowInst) {
1277 return new MCAsmStreamer(Context, OS, isVerboseAsm, useLoc, useCFI,
1278 IP, CE, MAB, ShowInst);
1279 }
1280