1 //===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output ----------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "llvm/ADT/Optional.h"
10 #include "llvm/ADT/STLExtras.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "llvm/ADT/StringExtras.h"
13 #include "llvm/ADT/Twine.h"
14 #include "llvm/DebugInfo/CodeView/SymbolRecord.h"
15 #include "llvm/MC/MCAsmBackend.h"
16 #include "llvm/MC/MCAsmInfo.h"
17 #include "llvm/MC/MCAssembler.h"
18 #include "llvm/MC/MCCodeEmitter.h"
19 #include "llvm/MC/MCCodeView.h"
20 #include "llvm/MC/MCContext.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCFixupKindInfo.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/MC/MCInstPrinter.h"
25 #include "llvm/MC/MCObjectFileInfo.h"
26 #include "llvm/MC/MCObjectWriter.h"
27 #include "llvm/MC/MCRegister.h"
28 #include "llvm/MC/MCRegisterInfo.h"
29 #include "llvm/MC/MCSectionMachO.h"
30 #include "llvm/MC/MCStreamer.h"
31 #include "llvm/MC/MCSymbolXCOFF.h"
32 #include "llvm/Support/ErrorHandling.h"
33 #include "llvm/Support/Format.h"
34 #include "llvm/Support/FormattedStream.h"
35 #include "llvm/Support/LEB128.h"
36 #include "llvm/Support/MathExtras.h"
37 #include "llvm/Support/Path.h"
38 #include "llvm/Support/TargetRegistry.h"
39 #include <cctype>
40
41 using namespace llvm;
42
43 namespace {
44
45 class MCAsmStreamer final : public MCStreamer {
46 std::unique_ptr<formatted_raw_ostream> OSOwner;
47 formatted_raw_ostream &OS;
48 const MCAsmInfo *MAI;
49 std::unique_ptr<MCInstPrinter> InstPrinter;
50 std::unique_ptr<MCAssembler> Assembler;
51
52 SmallString<128> ExplicitCommentToEmit;
53 SmallString<128> CommentToEmit;
54 raw_svector_ostream CommentStream;
55 raw_null_ostream NullStream;
56
57 unsigned IsVerboseAsm : 1;
58 unsigned ShowInst : 1;
59 unsigned UseDwarfDirectory : 1;
60
61 void EmitRegisterName(int64_t Register);
62 void emitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override;
63 void emitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override;
64
65 public:
MCAsmStreamer(MCContext & Context,std::unique_ptr<formatted_raw_ostream> os,bool isVerboseAsm,bool useDwarfDirectory,MCInstPrinter * printer,std::unique_ptr<MCCodeEmitter> emitter,std::unique_ptr<MCAsmBackend> asmbackend,bool showInst)66 MCAsmStreamer(MCContext &Context, std::unique_ptr<formatted_raw_ostream> os,
67 bool isVerboseAsm, bool useDwarfDirectory,
68 MCInstPrinter *printer, std::unique_ptr<MCCodeEmitter> emitter,
69 std::unique_ptr<MCAsmBackend> asmbackend, bool showInst)
70 : MCStreamer(Context), OSOwner(std::move(os)), OS(*OSOwner),
71 MAI(Context.getAsmInfo()), InstPrinter(printer),
72 Assembler(std::make_unique<MCAssembler>(
73 Context, std::move(asmbackend), std::move(emitter),
74 (asmbackend) ? asmbackend->createObjectWriter(NullStream)
75 : nullptr)),
76 CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
77 ShowInst(showInst), UseDwarfDirectory(useDwarfDirectory) {
78 assert(InstPrinter);
79 if (IsVerboseAsm)
80 InstPrinter->setCommentStream(CommentStream);
81 if (Assembler->getBackendPtr())
82 setAllowAutoPadding(Assembler->getBackend().allowAutoPadding());
83
84 Context.setUseNamesOnTempLabels(true);
85 }
86
getAssembler()87 MCAssembler &getAssembler() { return *Assembler; }
getAssemblerPtr()88 MCAssembler *getAssemblerPtr() override { return nullptr; }
89
EmitEOL()90 inline void EmitEOL() {
91 // Dump Explicit Comments here.
92 emitExplicitComments();
93 // If we don't have any comments, just emit a \n.
94 if (!IsVerboseAsm) {
95 OS << '\n';
96 return;
97 }
98 EmitCommentsAndEOL();
99 }
100
101 void emitSyntaxDirective() override;
102
103 void EmitCommentsAndEOL();
104
105 /// Return true if this streamer supports verbose assembly at all.
isVerboseAsm() const106 bool isVerboseAsm() const override { return IsVerboseAsm; }
107
108 /// Do we support EmitRawText?
hasRawTextSupport() const109 bool hasRawTextSupport() const override { return true; }
110
111 /// Add a comment that can be emitted to the generated .s file to make the
112 /// output of the compiler more readable. This only affects the MCAsmStreamer
113 /// and only when verbose assembly output is enabled.
114 void AddComment(const Twine &T, bool EOL = true) override;
115
116 /// Add a comment showing the encoding of an instruction.
117 void AddEncodingComment(const MCInst &Inst, const MCSubtargetInfo &);
118
119 /// Return a raw_ostream that comments can be written to.
120 /// Unlike AddComment, you are required to terminate comments with \n if you
121 /// use this method.
GetCommentOS()122 raw_ostream &GetCommentOS() override {
123 if (!IsVerboseAsm)
124 return nulls(); // Discard comments unless in verbose asm mode.
125 return CommentStream;
126 }
127
128 void emitRawComment(const Twine &T, bool TabPrefix = true) override;
129
130 void addExplicitComment(const Twine &T) override;
131 void emitExplicitComments() override;
132
133 /// Emit a blank line to a .s file to pretty it up.
AddBlankLine()134 void AddBlankLine() override {
135 EmitEOL();
136 }
137
138 /// @name MCStreamer Interface
139 /// @{
140
141 void changeSection(MCSection *Section, const MCExpr *Subsection) override;
142
143 void emitELFSymverDirective(StringRef AliasName,
144 const MCSymbol *Aliasee) override;
145
146 void emitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override;
147 void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
148
149 void emitAssemblerFlag(MCAssemblerFlag Flag) override;
150 void emitLinkerOptions(ArrayRef<std::string> Options) override;
151 void emitDataRegion(MCDataRegionType Kind) override;
152 void emitVersionMin(MCVersionMinType Kind, unsigned Major, unsigned Minor,
153 unsigned Update, VersionTuple SDKVersion) override;
154 void emitBuildVersion(unsigned Platform, unsigned Major, unsigned Minor,
155 unsigned Update, VersionTuple SDKVersion) override;
156 void emitThumbFunc(MCSymbol *Func) override;
157
158 void emitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
159 void emitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
160 bool emitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
161
162 void emitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
163 void BeginCOFFSymbolDef(const MCSymbol *Symbol) override;
164 void EmitCOFFSymbolStorageClass(int StorageClass) override;
165 void EmitCOFFSymbolType(int Type) override;
166 void EndCOFFSymbolDef() override;
167 void EmitCOFFSafeSEH(MCSymbol const *Symbol) override;
168 void EmitCOFFSymbolIndex(MCSymbol const *Symbol) override;
169 void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
170 void EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) override;
171 void EmitCOFFImgRel32(MCSymbol const *Symbol, int64_t Offset) override;
172 void emitXCOFFLocalCommonSymbol(MCSymbol *LabelSym, uint64_t Size,
173 MCSymbol *CsectSym,
174 unsigned ByteAlign) override;
175 void emitXCOFFSymbolLinkageWithVisibility(MCSymbol *Symbol,
176 MCSymbolAttr Linakge,
177 MCSymbolAttr Visibility) override;
178 void emitXCOFFRenameDirective(const MCSymbol *Name,
179 StringRef Rename) override;
180
181 void emitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
182 void emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
183 unsigned ByteAlignment) override;
184
185 /// Emit a local common (.lcomm) symbol.
186 ///
187 /// @param Symbol - The common symbol to emit.
188 /// @param Size - The size of the common symbol.
189 /// @param ByteAlignment - The alignment of the common symbol in bytes.
190 void emitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
191 unsigned ByteAlignment) override;
192
193 void emitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
194 uint64_t Size = 0, unsigned ByteAlignment = 0,
195 SMLoc Loc = SMLoc()) override;
196
197 void emitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
198 unsigned ByteAlignment = 0) override;
199
200 void emitBinaryData(StringRef Data) override;
201
202 void emitBytes(StringRef Data) override;
203
204 void emitValueImpl(const MCExpr *Value, unsigned Size,
205 SMLoc Loc = SMLoc()) override;
206 void emitIntValue(uint64_t Value, unsigned Size) override;
207 void emitIntValueInHex(uint64_t Value, unsigned Size) override;
208 void emitIntValueInHexWithPadding(uint64_t Value, unsigned Size) override;
209
210 void emitULEB128Value(const MCExpr *Value) override;
211
212 void emitSLEB128Value(const MCExpr *Value) override;
213
214 void emitDTPRel32Value(const MCExpr *Value) override;
215 void emitDTPRel64Value(const MCExpr *Value) override;
216 void emitTPRel32Value(const MCExpr *Value) override;
217 void emitTPRel64Value(const MCExpr *Value) override;
218
219 void emitGPRel64Value(const MCExpr *Value) override;
220
221 void emitGPRel32Value(const MCExpr *Value) override;
222
223 void emitFill(const MCExpr &NumBytes, uint64_t FillValue,
224 SMLoc Loc = SMLoc()) override;
225
226 void emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
227 SMLoc Loc = SMLoc()) override;
228
229 void emitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
230 unsigned ValueSize = 1,
231 unsigned MaxBytesToEmit = 0) override;
232
233 void emitCodeAlignment(unsigned ByteAlignment,
234 unsigned MaxBytesToEmit = 0) override;
235
236 void emitValueToOffset(const MCExpr *Offset,
237 unsigned char Value,
238 SMLoc Loc) override;
239
240 void emitFileDirective(StringRef Filename) override;
241 Expected<unsigned> tryEmitDwarfFileDirective(unsigned FileNo,
242 StringRef Directory,
243 StringRef Filename,
244 Optional<MD5::MD5Result> Checksum = None,
245 Optional<StringRef> Source = None,
246 unsigned CUID = 0) override;
247 void emitDwarfFile0Directive(StringRef Directory, StringRef Filename,
248 Optional<MD5::MD5Result> Checksum,
249 Optional<StringRef> Source,
250 unsigned CUID = 0) override;
251 void emitDwarfLocDirective(unsigned FileNo, unsigned Line, unsigned Column,
252 unsigned Flags, unsigned Isa,
253 unsigned Discriminator,
254 StringRef FileName) override;
255 MCSymbol *getDwarfLineTableSymbol(unsigned CUID) override;
256
257 bool EmitCVFileDirective(unsigned FileNo, StringRef Filename,
258 ArrayRef<uint8_t> Checksum,
259 unsigned ChecksumKind) override;
260 bool EmitCVFuncIdDirective(unsigned FuncId) override;
261 bool EmitCVInlineSiteIdDirective(unsigned FunctionId, unsigned IAFunc,
262 unsigned IAFile, unsigned IALine,
263 unsigned IACol, SMLoc Loc) override;
264 void emitCVLocDirective(unsigned FunctionId, unsigned FileNo, unsigned Line,
265 unsigned Column, bool PrologueEnd, bool IsStmt,
266 StringRef FileName, SMLoc Loc) override;
267 void emitCVLinetableDirective(unsigned FunctionId, const MCSymbol *FnStart,
268 const MCSymbol *FnEnd) override;
269 void emitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
270 unsigned SourceFileId,
271 unsigned SourceLineNum,
272 const MCSymbol *FnStartSym,
273 const MCSymbol *FnEndSym) override;
274
275 void PrintCVDefRangePrefix(
276 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges);
277
278 void emitCVDefRangeDirective(
279 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
280 codeview::DefRangeRegisterRelHeader DRHdr) override;
281
282 void emitCVDefRangeDirective(
283 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
284 codeview::DefRangeSubfieldRegisterHeader DRHdr) override;
285
286 void emitCVDefRangeDirective(
287 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
288 codeview::DefRangeRegisterHeader DRHdr) override;
289
290 void emitCVDefRangeDirective(
291 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
292 codeview::DefRangeFramePointerRelHeader DRHdr) override;
293
294 void emitCVStringTableDirective() override;
295 void emitCVFileChecksumsDirective() override;
296 void emitCVFileChecksumOffsetDirective(unsigned FileNo) override;
297 void EmitCVFPOData(const MCSymbol *ProcSym, SMLoc L) override;
298
299 void emitIdent(StringRef IdentString) override;
300 void emitCFIBKeyFrame() override;
301 void emitCFISections(bool EH, bool Debug) override;
302 void emitCFIDefCfa(int64_t Register, int64_t Offset) override;
303 void emitCFIDefCfaOffset(int64_t Offset) override;
304 void emitCFIDefCfaRegister(int64_t Register) override;
305 void emitCFIOffset(int64_t Register, int64_t Offset) override;
306 void emitCFIPersonality(const MCSymbol *Sym, unsigned Encoding) override;
307 void emitCFILsda(const MCSymbol *Sym, unsigned Encoding) override;
308 void emitCFIRememberState() override;
309 void emitCFIRestoreState() override;
310 void emitCFIRestore(int64_t Register) override;
311 void emitCFISameValue(int64_t Register) override;
312 void emitCFIRelOffset(int64_t Register, int64_t Offset) override;
313 void emitCFIAdjustCfaOffset(int64_t Adjustment) override;
314 void emitCFIEscape(StringRef Values) override;
315 void emitCFIGnuArgsSize(int64_t Size) override;
316 void emitCFISignalFrame() override;
317 void emitCFIUndefined(int64_t Register) override;
318 void emitCFIRegister(int64_t Register1, int64_t Register2) override;
319 void emitCFIWindowSave() override;
320 void emitCFINegateRAState() override;
321 void emitCFIReturnColumn(int64_t Register) override;
322
323 void EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) override;
324 void EmitWinCFIEndProc(SMLoc Loc) override;
325 void EmitWinCFIFuncletOrFuncEnd(SMLoc Loc) override;
326 void EmitWinCFIStartChained(SMLoc Loc) override;
327 void EmitWinCFIEndChained(SMLoc Loc) override;
328 void EmitWinCFIPushReg(MCRegister Register, SMLoc Loc) override;
329 void EmitWinCFISetFrame(MCRegister Register, unsigned Offset,
330 SMLoc Loc) override;
331 void EmitWinCFIAllocStack(unsigned Size, SMLoc Loc) override;
332 void EmitWinCFISaveReg(MCRegister Register, unsigned Offset,
333 SMLoc Loc) override;
334 void EmitWinCFISaveXMM(MCRegister Register, unsigned Offset,
335 SMLoc Loc) override;
336 void EmitWinCFIPushFrame(bool Code, SMLoc Loc) override;
337 void EmitWinCFIEndProlog(SMLoc Loc) override;
338
339 void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except,
340 SMLoc Loc) override;
341 void EmitWinEHHandlerData(SMLoc Loc) override;
342
343 void emitCGProfileEntry(const MCSymbolRefExpr *From,
344 const MCSymbolRefExpr *To, uint64_t Count) override;
345
346 void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
347
348 void emitBundleAlignMode(unsigned AlignPow2) override;
349 void emitBundleLock(bool AlignToEnd) override;
350 void emitBundleUnlock() override;
351
352 Optional<std::pair<bool, std::string>>
353 emitRelocDirective(const MCExpr &Offset, StringRef Name, const MCExpr *Expr,
354 SMLoc Loc, const MCSubtargetInfo &STI) override;
355
356 void emitAddrsig() override;
357 void emitAddrsigSym(const MCSymbol *Sym) override;
358
359 /// If this file is backed by an assembly streamer, this dumps the specified
360 /// string in the output .s file. This capability is indicated by the
361 /// hasRawTextSupport() predicate.
362 void emitRawTextImpl(StringRef String) override;
363
364 void finishImpl() override;
365 };
366
367 } // end anonymous namespace.
368
AddComment(const Twine & T,bool EOL)369 void MCAsmStreamer::AddComment(const Twine &T, bool EOL) {
370 if (!IsVerboseAsm) return;
371
372 T.toVector(CommentToEmit);
373
374 if (EOL)
375 CommentToEmit.push_back('\n'); // Place comment in a new line.
376 }
377
EmitCommentsAndEOL()378 void MCAsmStreamer::EmitCommentsAndEOL() {
379 if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
380 OS << '\n';
381 return;
382 }
383
384 StringRef Comments = CommentToEmit;
385
386 assert(Comments.back() == '\n' &&
387 "Comment array not newline terminated");
388 do {
389 // Emit a line of comments.
390 OS.PadToColumn(MAI->getCommentColumn());
391 size_t Position = Comments.find('\n');
392 OS << MAI->getCommentString() << ' ' << Comments.substr(0, Position) <<'\n';
393
394 Comments = Comments.substr(Position+1);
395 } while (!Comments.empty());
396
397 CommentToEmit.clear();
398 }
399
truncateToSize(int64_t Value,unsigned Bytes)400 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
401 assert(Bytes > 0 && Bytes <= 8 && "Invalid size!");
402 return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
403 }
404
emitRawComment(const Twine & T,bool TabPrefix)405 void MCAsmStreamer::emitRawComment(const Twine &T, bool TabPrefix) {
406 if (TabPrefix)
407 OS << '\t';
408 OS << MAI->getCommentString() << T;
409 EmitEOL();
410 }
411
addExplicitComment(const Twine & T)412 void MCAsmStreamer::addExplicitComment(const Twine &T) {
413 StringRef c = T.getSingleStringRef();
414 if (c.equals(StringRef(MAI->getSeparatorString())))
415 return;
416 if (c.startswith(StringRef("//"))) {
417 ExplicitCommentToEmit.append("\t");
418 ExplicitCommentToEmit.append(MAI->getCommentString());
419 // drop //
420 ExplicitCommentToEmit.append(c.slice(2, c.size()).str());
421 } else if (c.startswith(StringRef("/*"))) {
422 size_t p = 2, len = c.size() - 2;
423 // emit each line in comment as separate newline.
424 do {
425 size_t newp = std::min(len, c.find_first_of("\r\n", p));
426 ExplicitCommentToEmit.append("\t");
427 ExplicitCommentToEmit.append(MAI->getCommentString());
428 ExplicitCommentToEmit.append(c.slice(p, newp).str());
429 // If we have another line in this comment add line
430 if (newp < len)
431 ExplicitCommentToEmit.append("\n");
432 p = newp + 1;
433 } while (p < len);
434 } else if (c.startswith(StringRef(MAI->getCommentString()))) {
435 ExplicitCommentToEmit.append("\t");
436 ExplicitCommentToEmit.append(c.str());
437 } else if (c.front() == '#') {
438
439 ExplicitCommentToEmit.append("\t");
440 ExplicitCommentToEmit.append(MAI->getCommentString());
441 ExplicitCommentToEmit.append(c.slice(1, c.size()).str());
442 } else
443 assert(false && "Unexpected Assembly Comment");
444 // full line comments immediately output
445 if (c.back() == '\n')
446 emitExplicitComments();
447 }
448
emitExplicitComments()449 void MCAsmStreamer::emitExplicitComments() {
450 StringRef Comments = ExplicitCommentToEmit;
451 if (!Comments.empty())
452 OS << Comments;
453 ExplicitCommentToEmit.clear();
454 }
455
changeSection(MCSection * Section,const MCExpr * Subsection)456 void MCAsmStreamer::changeSection(MCSection *Section,
457 const MCExpr *Subsection) {
458 assert(Section && "Cannot switch to a null section!");
459 if (MCTargetStreamer *TS = getTargetStreamer()) {
460 TS->changeSection(getCurrentSectionOnly(), Section, Subsection, OS);
461 } else {
462 Section->PrintSwitchToSection(
463 *MAI, getContext().getObjectFileInfo()->getTargetTriple(), OS,
464 Subsection);
465 }
466 }
467
emitELFSymverDirective(StringRef AliasName,const MCSymbol * Aliasee)468 void MCAsmStreamer::emitELFSymverDirective(StringRef AliasName,
469 const MCSymbol *Aliasee) {
470 OS << ".symver ";
471 Aliasee->print(OS, MAI);
472 OS << ", " << AliasName;
473 EmitEOL();
474 }
475
emitLabel(MCSymbol * Symbol,SMLoc Loc)476 void MCAsmStreamer::emitLabel(MCSymbol *Symbol, SMLoc Loc) {
477 MCStreamer::emitLabel(Symbol, Loc);
478
479 Symbol->print(OS, MAI);
480 OS << MAI->getLabelSuffix();
481
482 EmitEOL();
483 }
484
emitLOHDirective(MCLOHType Kind,const MCLOHArgs & Args)485 void MCAsmStreamer::emitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {
486 StringRef str = MCLOHIdToName(Kind);
487
488 #ifndef NDEBUG
489 int NbArgs = MCLOHIdToNbArgs(Kind);
490 assert(NbArgs != -1 && ((size_t)NbArgs) == Args.size() && "Malformed LOH!");
491 assert(str != "" && "Invalid LOH name");
492 #endif
493
494 OS << "\t" << MCLOHDirectiveName() << " " << str << "\t";
495 bool IsFirst = true;
496 for (const MCSymbol *Arg : Args) {
497 if (!IsFirst)
498 OS << ", ";
499 IsFirst = false;
500 Arg->print(OS, MAI);
501 }
502 EmitEOL();
503 }
504
emitAssemblerFlag(MCAssemblerFlag Flag)505 void MCAsmStreamer::emitAssemblerFlag(MCAssemblerFlag Flag) {
506 switch (Flag) {
507 case MCAF_SyntaxUnified: OS << "\t.syntax unified"; break;
508 case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
509 case MCAF_Code16: OS << '\t'<< MAI->getCode16Directive();break;
510 case MCAF_Code32: OS << '\t'<< MAI->getCode32Directive();break;
511 case MCAF_Code64: OS << '\t'<< MAI->getCode64Directive();break;
512 }
513 EmitEOL();
514 }
515
emitLinkerOptions(ArrayRef<std::string> Options)516 void MCAsmStreamer::emitLinkerOptions(ArrayRef<std::string> Options) {
517 assert(!Options.empty() && "At least one option is required!");
518 OS << "\t.linker_option \"" << Options[0] << '"';
519 for (ArrayRef<std::string>::iterator it = Options.begin() + 1,
520 ie = Options.end(); it != ie; ++it) {
521 OS << ", " << '"' << *it << '"';
522 }
523 EmitEOL();
524 }
525
emitDataRegion(MCDataRegionType Kind)526 void MCAsmStreamer::emitDataRegion(MCDataRegionType Kind) {
527 if (!MAI->doesSupportDataRegionDirectives())
528 return;
529 switch (Kind) {
530 case MCDR_DataRegion: OS << "\t.data_region"; break;
531 case MCDR_DataRegionJT8: OS << "\t.data_region jt8"; break;
532 case MCDR_DataRegionJT16: OS << "\t.data_region jt16"; break;
533 case MCDR_DataRegionJT32: OS << "\t.data_region jt32"; break;
534 case MCDR_DataRegionEnd: OS << "\t.end_data_region"; break;
535 }
536 EmitEOL();
537 }
538
getVersionMinDirective(MCVersionMinType Type)539 static const char *getVersionMinDirective(MCVersionMinType Type) {
540 switch (Type) {
541 case MCVM_WatchOSVersionMin: return ".watchos_version_min";
542 case MCVM_TvOSVersionMin: return ".tvos_version_min";
543 case MCVM_IOSVersionMin: return ".ios_version_min";
544 case MCVM_OSXVersionMin: return ".macosx_version_min";
545 }
546 llvm_unreachable("Invalid MC version min type");
547 }
548
EmitSDKVersionSuffix(raw_ostream & OS,const VersionTuple & SDKVersion)549 static void EmitSDKVersionSuffix(raw_ostream &OS,
550 const VersionTuple &SDKVersion) {
551 if (SDKVersion.empty())
552 return;
553 OS << '\t' << "sdk_version " << SDKVersion.getMajor();
554 if (auto Minor = SDKVersion.getMinor()) {
555 OS << ", " << *Minor;
556 if (auto Subminor = SDKVersion.getSubminor()) {
557 OS << ", " << *Subminor;
558 }
559 }
560 }
561
emitVersionMin(MCVersionMinType Type,unsigned Major,unsigned Minor,unsigned Update,VersionTuple SDKVersion)562 void MCAsmStreamer::emitVersionMin(MCVersionMinType Type, unsigned Major,
563 unsigned Minor, unsigned Update,
564 VersionTuple SDKVersion) {
565 OS << '\t' << getVersionMinDirective(Type) << ' ' << Major << ", " << Minor;
566 if (Update)
567 OS << ", " << Update;
568 EmitSDKVersionSuffix(OS, SDKVersion);
569 EmitEOL();
570 }
571
getPlatformName(MachO::PlatformType Type)572 static const char *getPlatformName(MachO::PlatformType Type) {
573 switch (Type) {
574 case MachO::PLATFORM_MACOS: return "macos";
575 case MachO::PLATFORM_IOS: return "ios";
576 case MachO::PLATFORM_TVOS: return "tvos";
577 case MachO::PLATFORM_WATCHOS: return "watchos";
578 case MachO::PLATFORM_BRIDGEOS: return "bridgeos";
579 case MachO::PLATFORM_MACCATALYST: return "macCatalyst";
580 case MachO::PLATFORM_IOSSIMULATOR: return "iossimulator";
581 case MachO::PLATFORM_TVOSSIMULATOR: return "tvossimulator";
582 case MachO::PLATFORM_WATCHOSSIMULATOR: return "watchossimulator";
583 }
584 llvm_unreachable("Invalid Mach-O platform type");
585 }
586
emitBuildVersion(unsigned Platform,unsigned Major,unsigned Minor,unsigned Update,VersionTuple SDKVersion)587 void MCAsmStreamer::emitBuildVersion(unsigned Platform, unsigned Major,
588 unsigned Minor, unsigned Update,
589 VersionTuple SDKVersion) {
590 const char *PlatformName = getPlatformName((MachO::PlatformType)Platform);
591 OS << "\t.build_version " << PlatformName << ", " << Major << ", " << Minor;
592 if (Update)
593 OS << ", " << Update;
594 EmitSDKVersionSuffix(OS, SDKVersion);
595 EmitEOL();
596 }
597
emitThumbFunc(MCSymbol * Func)598 void MCAsmStreamer::emitThumbFunc(MCSymbol *Func) {
599 // This needs to emit to a temporary string to get properly quoted
600 // MCSymbols when they have spaces in them.
601 OS << "\t.thumb_func";
602 // Only Mach-O hasSubsectionsViaSymbols()
603 if (MAI->hasSubsectionsViaSymbols()) {
604 OS << '\t';
605 Func->print(OS, MAI);
606 }
607 EmitEOL();
608 }
609
emitAssignment(MCSymbol * Symbol,const MCExpr * Value)610 void MCAsmStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
611 // Do not emit a .set on inlined target assignments.
612 bool EmitSet = true;
613 if (auto *E = dyn_cast<MCTargetExpr>(Value))
614 if (E->inlineAssignedExpr())
615 EmitSet = false;
616 if (EmitSet) {
617 OS << ".set ";
618 Symbol->print(OS, MAI);
619 OS << ", ";
620 Value->print(OS, MAI);
621
622 EmitEOL();
623 }
624
625 MCStreamer::emitAssignment(Symbol, Value);
626 }
627
emitWeakReference(MCSymbol * Alias,const MCSymbol * Symbol)628 void MCAsmStreamer::emitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
629 OS << ".weakref ";
630 Alias->print(OS, MAI);
631 OS << ", ";
632 Symbol->print(OS, MAI);
633 EmitEOL();
634 }
635
emitSymbolAttribute(MCSymbol * Symbol,MCSymbolAttr Attribute)636 bool MCAsmStreamer::emitSymbolAttribute(MCSymbol *Symbol,
637 MCSymbolAttr Attribute) {
638 switch (Attribute) {
639 case MCSA_Invalid: llvm_unreachable("Invalid symbol attribute");
640 case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC # aka @function
641 case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
642 case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT # aka @object
643 case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS # aka @tls_object
644 case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON # aka @common
645 case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE # aka @notype
646 case MCSA_ELF_TypeGnuUniqueObject: /// .type _foo, @gnu_unique_object
647 if (!MAI->hasDotTypeDotSizeDirective())
648 return false; // Symbol attribute not supported
649 OS << "\t.type\t";
650 Symbol->print(OS, MAI);
651 OS << ',' << ((MAI->getCommentString()[0] != '@') ? '@' : '%');
652 switch (Attribute) {
653 default: return false;
654 case MCSA_ELF_TypeFunction: OS << "function"; break;
655 case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
656 case MCSA_ELF_TypeObject: OS << "object"; break;
657 case MCSA_ELF_TypeTLS: OS << "tls_object"; break;
658 case MCSA_ELF_TypeCommon: OS << "common"; break;
659 case MCSA_ELF_TypeNoType: OS << "notype"; break;
660 case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
661 }
662 EmitEOL();
663 return true;
664 case MCSA_Global: // .globl/.global
665 OS << MAI->getGlobalDirective();
666 break;
667 case MCSA_LGlobal: OS << "\t.lglobl\t"; break;
668 case MCSA_Hidden: OS << "\t.hidden\t"; break;
669 case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
670 case MCSA_Internal: OS << "\t.internal\t"; break;
671 case MCSA_LazyReference: OS << "\t.lazy_reference\t"; break;
672 case MCSA_Local: OS << "\t.local\t"; break;
673 case MCSA_NoDeadStrip:
674 if (!MAI->hasNoDeadStrip())
675 return false;
676 OS << "\t.no_dead_strip\t";
677 break;
678 case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
679 case MCSA_AltEntry: OS << "\t.alt_entry\t"; break;
680 case MCSA_PrivateExtern:
681 OS << "\t.private_extern\t";
682 break;
683 case MCSA_Protected: OS << "\t.protected\t"; break;
684 case MCSA_Reference: OS << "\t.reference\t"; break;
685 case MCSA_Extern:
686 OS << "\t.extern\t";
687 break;
688 case MCSA_Weak: OS << MAI->getWeakDirective(); break;
689 case MCSA_WeakDefinition:
690 OS << "\t.weak_definition\t";
691 break;
692 // .weak_reference
693 case MCSA_WeakReference: OS << MAI->getWeakRefDirective(); break;
694 case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
695 case MCSA_Cold:
696 // Assemblers currently do not support a .cold directive.
697 return false;
698 }
699
700 Symbol->print(OS, MAI);
701 EmitEOL();
702
703 return true;
704 }
705
emitSymbolDesc(MCSymbol * Symbol,unsigned DescValue)706 void MCAsmStreamer::emitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
707 OS << ".desc" << ' ';
708 Symbol->print(OS, MAI);
709 OS << ',' << DescValue;
710 EmitEOL();
711 }
712
emitSyntaxDirective()713 void MCAsmStreamer::emitSyntaxDirective() {
714 if (MAI->getAssemblerDialect() == 1) {
715 OS << "\t.intel_syntax noprefix";
716 EmitEOL();
717 }
718 // FIXME: Currently emit unprefix'ed registers.
719 // The intel_syntax directive has one optional argument
720 // with may have a value of prefix or noprefix.
721 }
722
BeginCOFFSymbolDef(const MCSymbol * Symbol)723 void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
724 OS << "\t.def\t ";
725 Symbol->print(OS, MAI);
726 OS << ';';
727 EmitEOL();
728 }
729
EmitCOFFSymbolStorageClass(int StorageClass)730 void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
731 OS << "\t.scl\t" << StorageClass << ';';
732 EmitEOL();
733 }
734
EmitCOFFSymbolType(int Type)735 void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
736 OS << "\t.type\t" << Type << ';';
737 EmitEOL();
738 }
739
EndCOFFSymbolDef()740 void MCAsmStreamer::EndCOFFSymbolDef() {
741 OS << "\t.endef";
742 EmitEOL();
743 }
744
EmitCOFFSafeSEH(MCSymbol const * Symbol)745 void MCAsmStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
746 OS << "\t.safeseh\t";
747 Symbol->print(OS, MAI);
748 EmitEOL();
749 }
750
EmitCOFFSymbolIndex(MCSymbol const * Symbol)751 void MCAsmStreamer::EmitCOFFSymbolIndex(MCSymbol const *Symbol) {
752 OS << "\t.symidx\t";
753 Symbol->print(OS, MAI);
754 EmitEOL();
755 }
756
EmitCOFFSectionIndex(MCSymbol const * Symbol)757 void MCAsmStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
758 OS << "\t.secidx\t";
759 Symbol->print(OS, MAI);
760 EmitEOL();
761 }
762
EmitCOFFSecRel32(MCSymbol const * Symbol,uint64_t Offset)763 void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) {
764 OS << "\t.secrel32\t";
765 Symbol->print(OS, MAI);
766 if (Offset != 0)
767 OS << '+' << Offset;
768 EmitEOL();
769 }
770
EmitCOFFImgRel32(MCSymbol const * Symbol,int64_t Offset)771 void MCAsmStreamer::EmitCOFFImgRel32(MCSymbol const *Symbol, int64_t Offset) {
772 OS << "\t.rva\t";
773 Symbol->print(OS, MAI);
774 if (Offset > 0)
775 OS << '+' << Offset;
776 else if (Offset < 0)
777 OS << '-' << -Offset;
778 EmitEOL();
779 }
780
781 // We need an XCOFF-specific version of this directive as the AIX syntax
782 // requires a QualName argument identifying the csect name and storage mapping
783 // class to appear before the alignment if we are specifying it.
emitXCOFFLocalCommonSymbol(MCSymbol * LabelSym,uint64_t Size,MCSymbol * CsectSym,unsigned ByteAlignment)784 void MCAsmStreamer::emitXCOFFLocalCommonSymbol(MCSymbol *LabelSym,
785 uint64_t Size,
786 MCSymbol *CsectSym,
787 unsigned ByteAlignment) {
788 assert(MAI->getLCOMMDirectiveAlignmentType() == LCOMM::Log2Alignment &&
789 "We only support writing log base-2 alignment format with XCOFF.");
790 assert(isPowerOf2_32(ByteAlignment) && "Alignment must be a power of 2.");
791
792 OS << "\t.lcomm\t";
793 LabelSym->print(OS, MAI);
794 OS << ',' << Size << ',';
795 CsectSym->print(OS, MAI);
796 OS << ',' << Log2_32(ByteAlignment);
797
798 EmitEOL();
799 }
800
emitXCOFFSymbolLinkageWithVisibility(MCSymbol * Symbol,MCSymbolAttr Linkage,MCSymbolAttr Visibility)801 void MCAsmStreamer::emitXCOFFSymbolLinkageWithVisibility(
802 MCSymbol *Symbol, MCSymbolAttr Linkage, MCSymbolAttr Visibility) {
803 // Print symbol's rename (original name contains invalid character(s)) if
804 // there is one.
805 if (cast<MCSymbolXCOFF>(Symbol)->hasRename())
806 emitXCOFFRenameDirective(Symbol,
807 cast<MCSymbolXCOFF>(Symbol)->getSymbolTableName());
808
809 switch (Linkage) {
810 case MCSA_Global:
811 OS << MAI->getGlobalDirective();
812 break;
813 case MCSA_Weak:
814 OS << MAI->getWeakDirective();
815 break;
816 case MCSA_Extern:
817 OS << "\t.extern\t";
818 break;
819 case MCSA_LGlobal:
820 OS << "\t.lglobl\t";
821 break;
822 default:
823 report_fatal_error("unhandled linkage type");
824 }
825
826 Symbol->print(OS, MAI);
827
828 switch (Visibility) {
829 case MCSA_Invalid:
830 // Nothing to do.
831 break;
832 case MCSA_Hidden:
833 OS << ",hidden";
834 break;
835 case MCSA_Protected:
836 OS << ",protected";
837 break;
838 default:
839 report_fatal_error("unexpected value for Visibility type");
840 }
841 EmitEOL();
842 }
843
emitXCOFFRenameDirective(const MCSymbol * Name,StringRef Rename)844 void MCAsmStreamer::emitXCOFFRenameDirective(const MCSymbol *Name,
845 StringRef Rename) {
846 OS << "\t.rename\t";
847 Name->print(OS, MAI);
848 const char DQ = '"';
849 OS << ',' << DQ;
850 for (char C : Rename) {
851 // To escape a double quote character, the character should be doubled.
852 if (C == DQ)
853 OS << DQ;
854 OS << C;
855 }
856 OS << DQ;
857 EmitEOL();
858 }
859
emitELFSize(MCSymbol * Symbol,const MCExpr * Value)860 void MCAsmStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
861 assert(MAI->hasDotTypeDotSizeDirective());
862 OS << "\t.size\t";
863 Symbol->print(OS, MAI);
864 OS << ", ";
865 Value->print(OS, MAI);
866 EmitEOL();
867 }
868
emitCommonSymbol(MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)869 void MCAsmStreamer::emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
870 unsigned ByteAlignment) {
871 // Print symbol's rename (original name contains invalid character(s)) if
872 // there is one.
873 MCSymbolXCOFF *XSym = dyn_cast<MCSymbolXCOFF>(Symbol);
874 if (XSym && XSym->hasRename())
875 emitXCOFFRenameDirective(XSym, XSym->getSymbolTableName());
876
877 OS << "\t.comm\t";
878 Symbol->print(OS, MAI);
879 OS << ',' << Size;
880
881 if (ByteAlignment != 0) {
882 if (MAI->getCOMMDirectiveAlignmentIsInBytes())
883 OS << ',' << ByteAlignment;
884 else
885 OS << ',' << Log2_32(ByteAlignment);
886 }
887 EmitEOL();
888 }
889
emitLocalCommonSymbol(MCSymbol * Symbol,uint64_t Size,unsigned ByteAlign)890 void MCAsmStreamer::emitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
891 unsigned ByteAlign) {
892 OS << "\t.lcomm\t";
893 Symbol->print(OS, MAI);
894 OS << ',' << Size;
895
896 if (ByteAlign > 1) {
897 switch (MAI->getLCOMMDirectiveAlignmentType()) {
898 case LCOMM::NoAlignment:
899 llvm_unreachable("alignment not supported on .lcomm!");
900 case LCOMM::ByteAlignment:
901 OS << ',' << ByteAlign;
902 break;
903 case LCOMM::Log2Alignment:
904 assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
905 OS << ',' << Log2_32(ByteAlign);
906 break;
907 }
908 }
909 EmitEOL();
910 }
911
emitZerofill(MCSection * Section,MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment,SMLoc Loc)912 void MCAsmStreamer::emitZerofill(MCSection *Section, MCSymbol *Symbol,
913 uint64_t Size, unsigned ByteAlignment,
914 SMLoc Loc) {
915 if (Symbol)
916 AssignFragment(Symbol, &Section->getDummyFragment());
917
918 // Note: a .zerofill directive does not switch sections.
919 OS << ".zerofill ";
920
921 assert(Section->getVariant() == MCSection::SV_MachO &&
922 ".zerofill is a Mach-O specific directive");
923 // This is a mach-o specific directive.
924
925 const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
926 OS << MOSection->getSegmentName() << "," << MOSection->getName();
927
928 if (Symbol) {
929 OS << ',';
930 Symbol->print(OS, MAI);
931 OS << ',' << Size;
932 if (ByteAlignment != 0)
933 OS << ',' << Log2_32(ByteAlignment);
934 }
935 EmitEOL();
936 }
937
938 // .tbss sym, size, align
939 // This depends that the symbol has already been mangled from the original,
940 // e.g. _a.
emitTBSSSymbol(MCSection * Section,MCSymbol * Symbol,uint64_t Size,unsigned ByteAlignment)941 void MCAsmStreamer::emitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
942 uint64_t Size, unsigned ByteAlignment) {
943 AssignFragment(Symbol, &Section->getDummyFragment());
944
945 assert(Symbol && "Symbol shouldn't be NULL!");
946 // Instead of using the Section we'll just use the shortcut.
947
948 assert(Section->getVariant() == MCSection::SV_MachO &&
949 ".zerofill is a Mach-O specific directive");
950 // This is a mach-o specific directive and section.
951
952 OS << ".tbss ";
953 Symbol->print(OS, MAI);
954 OS << ", " << Size;
955
956 // Output align if we have it. We default to 1 so don't bother printing
957 // that.
958 if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
959
960 EmitEOL();
961 }
962
toOctal(int X)963 static inline char toOctal(int X) { return (X&7)+'0'; }
964
PrintQuotedString(StringRef Data,raw_ostream & OS)965 static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
966 OS << '"';
967
968 for (unsigned i = 0, e = Data.size(); i != e; ++i) {
969 unsigned char C = Data[i];
970 if (C == '"' || C == '\\') {
971 OS << '\\' << (char)C;
972 continue;
973 }
974
975 if (isPrint((unsigned char)C)) {
976 OS << (char)C;
977 continue;
978 }
979
980 switch (C) {
981 case '\b': OS << "\\b"; break;
982 case '\f': OS << "\\f"; break;
983 case '\n': OS << "\\n"; break;
984 case '\r': OS << "\\r"; break;
985 case '\t': OS << "\\t"; break;
986 default:
987 OS << '\\';
988 OS << toOctal(C >> 6);
989 OS << toOctal(C >> 3);
990 OS << toOctal(C >> 0);
991 break;
992 }
993 }
994
995 OS << '"';
996 }
997
emitBytes(StringRef Data)998 void MCAsmStreamer::emitBytes(StringRef Data) {
999 assert(getCurrentSectionOnly() &&
1000 "Cannot emit contents before setting section!");
1001 if (Data.empty()) return;
1002
1003 // If only single byte is provided or no ascii or asciz directives is
1004 // supported, emit as vector of 8bits data.
1005 if (Data.size() == 1 ||
1006 !(MAI->getAscizDirective() || MAI->getAsciiDirective())) {
1007 if (MCTargetStreamer *TS = getTargetStreamer()) {
1008 TS->emitRawBytes(Data);
1009 } else {
1010 const char *Directive = MAI->getData8bitsDirective();
1011 for (const unsigned char C : Data.bytes()) {
1012 OS << Directive << (unsigned)C;
1013 EmitEOL();
1014 }
1015 }
1016 return;
1017 }
1018
1019 // If the data ends with 0 and the target supports .asciz, use it, otherwise
1020 // use .ascii
1021 if (MAI->getAscizDirective() && Data.back() == 0) {
1022 OS << MAI->getAscizDirective();
1023 Data = Data.substr(0, Data.size()-1);
1024 } else {
1025 OS << MAI->getAsciiDirective();
1026 }
1027
1028 PrintQuotedString(Data, OS);
1029 EmitEOL();
1030 }
1031
emitBinaryData(StringRef Data)1032 void MCAsmStreamer::emitBinaryData(StringRef Data) {
1033 // This is binary data. Print it in a grid of hex bytes for readability.
1034 const size_t Cols = 4;
1035 for (size_t I = 0, EI = alignTo(Data.size(), Cols); I < EI; I += Cols) {
1036 size_t J = I, EJ = std::min(I + Cols, Data.size());
1037 assert(EJ > 0);
1038 OS << MAI->getData8bitsDirective();
1039 for (; J < EJ - 1; ++J)
1040 OS << format("0x%02x", uint8_t(Data[J])) << ", ";
1041 OS << format("0x%02x", uint8_t(Data[J]));
1042 EmitEOL();
1043 }
1044 }
1045
emitIntValue(uint64_t Value,unsigned Size)1046 void MCAsmStreamer::emitIntValue(uint64_t Value, unsigned Size) {
1047 emitValue(MCConstantExpr::create(Value, getContext()), Size);
1048 }
1049
emitIntValueInHex(uint64_t Value,unsigned Size)1050 void MCAsmStreamer::emitIntValueInHex(uint64_t Value, unsigned Size) {
1051 emitValue(MCConstantExpr::create(Value, getContext(), true), Size);
1052 }
1053
emitIntValueInHexWithPadding(uint64_t Value,unsigned Size)1054 void MCAsmStreamer::emitIntValueInHexWithPadding(uint64_t Value,
1055 unsigned Size) {
1056 emitValue(MCConstantExpr::create(Value, getContext(), true, Size), Size);
1057 }
1058
emitValueImpl(const MCExpr * Value,unsigned Size,SMLoc Loc)1059 void MCAsmStreamer::emitValueImpl(const MCExpr *Value, unsigned Size,
1060 SMLoc Loc) {
1061 assert(Size <= 8 && "Invalid size");
1062 assert(getCurrentSectionOnly() &&
1063 "Cannot emit contents before setting section!");
1064 const char *Directive = nullptr;
1065 switch (Size) {
1066 default: break;
1067 case 1: Directive = MAI->getData8bitsDirective(); break;
1068 case 2: Directive = MAI->getData16bitsDirective(); break;
1069 case 4: Directive = MAI->getData32bitsDirective(); break;
1070 case 8: Directive = MAI->getData64bitsDirective(); break;
1071 }
1072
1073 if (!Directive) {
1074 int64_t IntValue;
1075 if (!Value->evaluateAsAbsolute(IntValue))
1076 report_fatal_error("Don't know how to emit this value.");
1077
1078 // We couldn't handle the requested integer size so we fallback by breaking
1079 // the request down into several, smaller, integers.
1080 // Since sizes greater or equal to "Size" are invalid, we use the greatest
1081 // power of 2 that is less than "Size" as our largest piece of granularity.
1082 bool IsLittleEndian = MAI->isLittleEndian();
1083 for (unsigned Emitted = 0; Emitted != Size;) {
1084 unsigned Remaining = Size - Emitted;
1085 // The size of our partial emission must be a power of two less than
1086 // Size.
1087 unsigned EmissionSize = PowerOf2Floor(std::min(Remaining, Size - 1));
1088 // Calculate the byte offset of our partial emission taking into account
1089 // the endianness of the target.
1090 unsigned ByteOffset =
1091 IsLittleEndian ? Emitted : (Remaining - EmissionSize);
1092 uint64_t ValueToEmit = IntValue >> (ByteOffset * 8);
1093 // We truncate our partial emission to fit within the bounds of the
1094 // emission domain. This produces nicer output and silences potential
1095 // truncation warnings when round tripping through another assembler.
1096 uint64_t Shift = 64 - EmissionSize * 8;
1097 assert(Shift < static_cast<uint64_t>(
1098 std::numeric_limits<unsigned long long>::digits) &&
1099 "undefined behavior");
1100 ValueToEmit &= ~0ULL >> Shift;
1101 emitIntValue(ValueToEmit, EmissionSize);
1102 Emitted += EmissionSize;
1103 }
1104 return;
1105 }
1106
1107 assert(Directive && "Invalid size for machine code value!");
1108 OS << Directive;
1109 if (MCTargetStreamer *TS = getTargetStreamer()) {
1110 TS->emitValue(Value);
1111 } else {
1112 Value->print(OS, MAI);
1113 EmitEOL();
1114 }
1115 }
1116
emitULEB128Value(const MCExpr * Value)1117 void MCAsmStreamer::emitULEB128Value(const MCExpr *Value) {
1118 int64_t IntValue;
1119 if (Value->evaluateAsAbsolute(IntValue)) {
1120 emitULEB128IntValue(IntValue);
1121 return;
1122 }
1123 OS << "\t.uleb128 ";
1124 Value->print(OS, MAI);
1125 EmitEOL();
1126 }
1127
emitSLEB128Value(const MCExpr * Value)1128 void MCAsmStreamer::emitSLEB128Value(const MCExpr *Value) {
1129 int64_t IntValue;
1130 if (Value->evaluateAsAbsolute(IntValue)) {
1131 emitSLEB128IntValue(IntValue);
1132 return;
1133 }
1134 OS << "\t.sleb128 ";
1135 Value->print(OS, MAI);
1136 EmitEOL();
1137 }
1138
emitDTPRel64Value(const MCExpr * Value)1139 void MCAsmStreamer::emitDTPRel64Value(const MCExpr *Value) {
1140 assert(MAI->getDTPRel64Directive() != nullptr);
1141 OS << MAI->getDTPRel64Directive();
1142 Value->print(OS, MAI);
1143 EmitEOL();
1144 }
1145
emitDTPRel32Value(const MCExpr * Value)1146 void MCAsmStreamer::emitDTPRel32Value(const MCExpr *Value) {
1147 assert(MAI->getDTPRel32Directive() != nullptr);
1148 OS << MAI->getDTPRel32Directive();
1149 Value->print(OS, MAI);
1150 EmitEOL();
1151 }
1152
emitTPRel64Value(const MCExpr * Value)1153 void MCAsmStreamer::emitTPRel64Value(const MCExpr *Value) {
1154 assert(MAI->getTPRel64Directive() != nullptr);
1155 OS << MAI->getTPRel64Directive();
1156 Value->print(OS, MAI);
1157 EmitEOL();
1158 }
1159
emitTPRel32Value(const MCExpr * Value)1160 void MCAsmStreamer::emitTPRel32Value(const MCExpr *Value) {
1161 assert(MAI->getTPRel32Directive() != nullptr);
1162 OS << MAI->getTPRel32Directive();
1163 Value->print(OS, MAI);
1164 EmitEOL();
1165 }
1166
emitGPRel64Value(const MCExpr * Value)1167 void MCAsmStreamer::emitGPRel64Value(const MCExpr *Value) {
1168 assert(MAI->getGPRel64Directive() != nullptr);
1169 OS << MAI->getGPRel64Directive();
1170 Value->print(OS, MAI);
1171 EmitEOL();
1172 }
1173
emitGPRel32Value(const MCExpr * Value)1174 void MCAsmStreamer::emitGPRel32Value(const MCExpr *Value) {
1175 assert(MAI->getGPRel32Directive() != nullptr);
1176 OS << MAI->getGPRel32Directive();
1177 Value->print(OS, MAI);
1178 EmitEOL();
1179 }
1180
emitFill(const MCExpr & NumBytes,uint64_t FillValue,SMLoc Loc)1181 void MCAsmStreamer::emitFill(const MCExpr &NumBytes, uint64_t FillValue,
1182 SMLoc Loc) {
1183 int64_t IntNumBytes;
1184 const bool IsAbsolute = NumBytes.evaluateAsAbsolute(IntNumBytes);
1185 if (IsAbsolute && IntNumBytes == 0)
1186 return;
1187
1188 if (const char *ZeroDirective = MAI->getZeroDirective()) {
1189 if (MAI->doesZeroDirectiveSupportNonZeroValue() || FillValue == 0) {
1190 // FIXME: Emit location directives
1191 OS << ZeroDirective;
1192 NumBytes.print(OS, MAI);
1193 if (FillValue != 0)
1194 OS << ',' << (int)FillValue;
1195 EmitEOL();
1196 } else {
1197 if (!IsAbsolute)
1198 report_fatal_error(
1199 "Cannot emit non-absolute expression lengths of fill.");
1200 for (int i = 0; i < IntNumBytes; ++i) {
1201 OS << MAI->getData8bitsDirective() << (int)FillValue;
1202 EmitEOL();
1203 }
1204 }
1205 return;
1206 }
1207
1208 MCStreamer::emitFill(NumBytes, FillValue);
1209 }
1210
emitFill(const MCExpr & NumValues,int64_t Size,int64_t Expr,SMLoc Loc)1211 void MCAsmStreamer::emitFill(const MCExpr &NumValues, int64_t Size,
1212 int64_t Expr, SMLoc Loc) {
1213 // FIXME: Emit location directives
1214 OS << "\t.fill\t";
1215 NumValues.print(OS, MAI);
1216 OS << ", " << Size << ", 0x";
1217 OS.write_hex(truncateToSize(Expr, 4));
1218 EmitEOL();
1219 }
1220
emitValueToAlignment(unsigned ByteAlignment,int64_t Value,unsigned ValueSize,unsigned MaxBytesToEmit)1221 void MCAsmStreamer::emitValueToAlignment(unsigned ByteAlignment, int64_t Value,
1222 unsigned ValueSize,
1223 unsigned MaxBytesToEmit) {
1224 if (MAI->useDotAlignForAlignment()) {
1225 if (!isPowerOf2_32(ByteAlignment))
1226 report_fatal_error("Only power-of-two alignments are supported "
1227 "with .align.");
1228 OS << "\t.align\t";
1229 OS << Log2_32(ByteAlignment);
1230 EmitEOL();
1231 return;
1232 }
1233
1234 // Some assemblers don't support non-power of two alignments, so we always
1235 // emit alignments as a power of two if possible.
1236 if (isPowerOf2_32(ByteAlignment)) {
1237 switch (ValueSize) {
1238 default:
1239 llvm_unreachable("Invalid size for machine code value!");
1240 case 1:
1241 OS << "\t.p2align\t";
1242 break;
1243 case 2:
1244 OS << ".p2alignw ";
1245 break;
1246 case 4:
1247 OS << ".p2alignl ";
1248 break;
1249 case 8:
1250 llvm_unreachable("Unsupported alignment size!");
1251 }
1252
1253 OS << Log2_32(ByteAlignment);
1254
1255 if (Value || MaxBytesToEmit) {
1256 OS << ", 0x";
1257 OS.write_hex(truncateToSize(Value, ValueSize));
1258
1259 if (MaxBytesToEmit)
1260 OS << ", " << MaxBytesToEmit;
1261 }
1262 EmitEOL();
1263 return;
1264 }
1265
1266 // Non-power of two alignment. This is not widely supported by assemblers.
1267 // FIXME: Parameterize this based on MAI.
1268 switch (ValueSize) {
1269 default: llvm_unreachable("Invalid size for machine code value!");
1270 case 1: OS << ".balign"; break;
1271 case 2: OS << ".balignw"; break;
1272 case 4: OS << ".balignl"; break;
1273 case 8: llvm_unreachable("Unsupported alignment size!");
1274 }
1275
1276 OS << ' ' << ByteAlignment;
1277 OS << ", " << truncateToSize(Value, ValueSize);
1278 if (MaxBytesToEmit)
1279 OS << ", " << MaxBytesToEmit;
1280 EmitEOL();
1281 }
1282
emitCodeAlignment(unsigned ByteAlignment,unsigned MaxBytesToEmit)1283 void MCAsmStreamer::emitCodeAlignment(unsigned ByteAlignment,
1284 unsigned MaxBytesToEmit) {
1285 // Emit with a text fill value.
1286 emitValueToAlignment(ByteAlignment, MAI->getTextAlignFillValue(),
1287 1, MaxBytesToEmit);
1288 }
1289
emitValueToOffset(const MCExpr * Offset,unsigned char Value,SMLoc Loc)1290 void MCAsmStreamer::emitValueToOffset(const MCExpr *Offset,
1291 unsigned char Value,
1292 SMLoc Loc) {
1293 // FIXME: Verify that Offset is associated with the current section.
1294 OS << ".org ";
1295 Offset->print(OS, MAI);
1296 OS << ", " << (unsigned)Value;
1297 EmitEOL();
1298 }
1299
emitFileDirective(StringRef Filename)1300 void MCAsmStreamer::emitFileDirective(StringRef Filename) {
1301 assert(MAI->hasSingleParameterDotFile());
1302 OS << "\t.file\t";
1303 PrintQuotedString(Filename, OS);
1304 EmitEOL();
1305 }
1306
printDwarfFileDirective(unsigned FileNo,StringRef Directory,StringRef Filename,Optional<MD5::MD5Result> Checksum,Optional<StringRef> Source,bool UseDwarfDirectory,raw_svector_ostream & OS)1307 static void printDwarfFileDirective(unsigned FileNo, StringRef Directory,
1308 StringRef Filename,
1309 Optional<MD5::MD5Result> Checksum,
1310 Optional<StringRef> Source,
1311 bool UseDwarfDirectory,
1312 raw_svector_ostream &OS) {
1313 SmallString<128> FullPathName;
1314
1315 if (!UseDwarfDirectory && !Directory.empty()) {
1316 if (sys::path::is_absolute(Filename))
1317 Directory = "";
1318 else {
1319 FullPathName = Directory;
1320 sys::path::append(FullPathName, Filename);
1321 Directory = "";
1322 Filename = FullPathName;
1323 }
1324 }
1325
1326 OS << "\t.file\t" << FileNo << ' ';
1327 if (!Directory.empty()) {
1328 PrintQuotedString(Directory, OS);
1329 OS << ' ';
1330 }
1331 PrintQuotedString(Filename, OS);
1332 if (Checksum)
1333 OS << " md5 0x" << Checksum->digest();
1334 if (Source) {
1335 OS << " source ";
1336 PrintQuotedString(*Source, OS);
1337 }
1338 }
1339
tryEmitDwarfFileDirective(unsigned FileNo,StringRef Directory,StringRef Filename,Optional<MD5::MD5Result> Checksum,Optional<StringRef> Source,unsigned CUID)1340 Expected<unsigned> MCAsmStreamer::tryEmitDwarfFileDirective(
1341 unsigned FileNo, StringRef Directory, StringRef Filename,
1342 Optional<MD5::MD5Result> Checksum, Optional<StringRef> Source, unsigned CUID) {
1343 assert(CUID == 0 && "multiple CUs not supported by MCAsmStreamer");
1344
1345 MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
1346 unsigned NumFiles = Table.getMCDwarfFiles().size();
1347 Expected<unsigned> FileNoOrErr =
1348 Table.tryGetFile(Directory, Filename, Checksum, Source,
1349 getContext().getDwarfVersion(), FileNo);
1350 if (!FileNoOrErr)
1351 return FileNoOrErr.takeError();
1352 FileNo = FileNoOrErr.get();
1353 if (NumFiles == Table.getMCDwarfFiles().size())
1354 return FileNo;
1355
1356 SmallString<128> Str;
1357 raw_svector_ostream OS1(Str);
1358 printDwarfFileDirective(FileNo, Directory, Filename, Checksum, Source,
1359 UseDwarfDirectory, OS1);
1360
1361 if (MCTargetStreamer *TS = getTargetStreamer())
1362 TS->emitDwarfFileDirective(OS1.str());
1363 else
1364 emitRawText(OS1.str());
1365
1366 return FileNo;
1367 }
1368
emitDwarfFile0Directive(StringRef Directory,StringRef Filename,Optional<MD5::MD5Result> Checksum,Optional<StringRef> Source,unsigned CUID)1369 void MCAsmStreamer::emitDwarfFile0Directive(StringRef Directory,
1370 StringRef Filename,
1371 Optional<MD5::MD5Result> Checksum,
1372 Optional<StringRef> Source,
1373 unsigned CUID) {
1374 assert(CUID == 0);
1375 // .file 0 is new for DWARF v5.
1376 if (getContext().getDwarfVersion() < 5)
1377 return;
1378 // Inform MCDwarf about the root file.
1379 getContext().setMCLineTableRootFile(CUID, Directory, Filename, Checksum,
1380 Source);
1381
1382 SmallString<128> Str;
1383 raw_svector_ostream OS1(Str);
1384 printDwarfFileDirective(0, Directory, Filename, Checksum, Source,
1385 UseDwarfDirectory, OS1);
1386
1387 if (MCTargetStreamer *TS = getTargetStreamer())
1388 TS->emitDwarfFileDirective(OS1.str());
1389 else
1390 emitRawText(OS1.str());
1391 }
1392
emitDwarfLocDirective(unsigned FileNo,unsigned Line,unsigned Column,unsigned Flags,unsigned Isa,unsigned Discriminator,StringRef FileName)1393 void MCAsmStreamer::emitDwarfLocDirective(unsigned FileNo, unsigned Line,
1394 unsigned Column, unsigned Flags,
1395 unsigned Isa, unsigned Discriminator,
1396 StringRef FileName) {
1397 OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
1398 if (MAI->supportsExtendedDwarfLocDirective()) {
1399 if (Flags & DWARF2_FLAG_BASIC_BLOCK)
1400 OS << " basic_block";
1401 if (Flags & DWARF2_FLAG_PROLOGUE_END)
1402 OS << " prologue_end";
1403 if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
1404 OS << " epilogue_begin";
1405
1406 unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
1407 if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
1408 OS << " is_stmt ";
1409
1410 if (Flags & DWARF2_FLAG_IS_STMT)
1411 OS << "1";
1412 else
1413 OS << "0";
1414 }
1415
1416 if (Isa)
1417 OS << " isa " << Isa;
1418 if (Discriminator)
1419 OS << " discriminator " << Discriminator;
1420 }
1421
1422 if (IsVerboseAsm) {
1423 OS.PadToColumn(MAI->getCommentColumn());
1424 OS << MAI->getCommentString() << ' ' << FileName << ':'
1425 << Line << ':' << Column;
1426 }
1427 EmitEOL();
1428 this->MCStreamer::emitDwarfLocDirective(FileNo, Line, Column, Flags, Isa,
1429 Discriminator, FileName);
1430 }
1431
getDwarfLineTableSymbol(unsigned CUID)1432 MCSymbol *MCAsmStreamer::getDwarfLineTableSymbol(unsigned CUID) {
1433 // Always use the zeroth line table, since asm syntax only supports one line
1434 // table for now.
1435 return MCStreamer::getDwarfLineTableSymbol(0);
1436 }
1437
EmitCVFileDirective(unsigned FileNo,StringRef Filename,ArrayRef<uint8_t> Checksum,unsigned ChecksumKind)1438 bool MCAsmStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename,
1439 ArrayRef<uint8_t> Checksum,
1440 unsigned ChecksumKind) {
1441 if (!getContext().getCVContext().addFile(*this, FileNo, Filename, Checksum,
1442 ChecksumKind))
1443 return false;
1444
1445 OS << "\t.cv_file\t" << FileNo << ' ';
1446 PrintQuotedString(Filename, OS);
1447
1448 if (!ChecksumKind) {
1449 EmitEOL();
1450 return true;
1451 }
1452
1453 OS << ' ';
1454 PrintQuotedString(toHex(Checksum), OS);
1455 OS << ' ' << ChecksumKind;
1456
1457 EmitEOL();
1458 return true;
1459 }
1460
EmitCVFuncIdDirective(unsigned FuncId)1461 bool MCAsmStreamer::EmitCVFuncIdDirective(unsigned FuncId) {
1462 OS << "\t.cv_func_id " << FuncId << '\n';
1463 return MCStreamer::EmitCVFuncIdDirective(FuncId);
1464 }
1465
EmitCVInlineSiteIdDirective(unsigned FunctionId,unsigned IAFunc,unsigned IAFile,unsigned IALine,unsigned IACol,SMLoc Loc)1466 bool MCAsmStreamer::EmitCVInlineSiteIdDirective(unsigned FunctionId,
1467 unsigned IAFunc,
1468 unsigned IAFile,
1469 unsigned IALine, unsigned IACol,
1470 SMLoc Loc) {
1471 OS << "\t.cv_inline_site_id " << FunctionId << " within " << IAFunc
1472 << " inlined_at " << IAFile << ' ' << IALine << ' ' << IACol << '\n';
1473 return MCStreamer::EmitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile,
1474 IALine, IACol, Loc);
1475 }
1476
emitCVLocDirective(unsigned FunctionId,unsigned FileNo,unsigned Line,unsigned Column,bool PrologueEnd,bool IsStmt,StringRef FileName,SMLoc Loc)1477 void MCAsmStreamer::emitCVLocDirective(unsigned FunctionId, unsigned FileNo,
1478 unsigned Line, unsigned Column,
1479 bool PrologueEnd, bool IsStmt,
1480 StringRef FileName, SMLoc Loc) {
1481 // Validate the directive.
1482 if (!checkCVLocSection(FunctionId, FileNo, Loc))
1483 return;
1484
1485 OS << "\t.cv_loc\t" << FunctionId << " " << FileNo << " " << Line << " "
1486 << Column;
1487 if (PrologueEnd)
1488 OS << " prologue_end";
1489
1490 if (IsStmt)
1491 OS << " is_stmt 1";
1492
1493 if (IsVerboseAsm) {
1494 OS.PadToColumn(MAI->getCommentColumn());
1495 OS << MAI->getCommentString() << ' ' << FileName << ':' << Line << ':'
1496 << Column;
1497 }
1498 EmitEOL();
1499 }
1500
emitCVLinetableDirective(unsigned FunctionId,const MCSymbol * FnStart,const MCSymbol * FnEnd)1501 void MCAsmStreamer::emitCVLinetableDirective(unsigned FunctionId,
1502 const MCSymbol *FnStart,
1503 const MCSymbol *FnEnd) {
1504 OS << "\t.cv_linetable\t" << FunctionId << ", ";
1505 FnStart->print(OS, MAI);
1506 OS << ", ";
1507 FnEnd->print(OS, MAI);
1508 EmitEOL();
1509 this->MCStreamer::emitCVLinetableDirective(FunctionId, FnStart, FnEnd);
1510 }
1511
emitCVInlineLinetableDirective(unsigned PrimaryFunctionId,unsigned SourceFileId,unsigned SourceLineNum,const MCSymbol * FnStartSym,const MCSymbol * FnEndSym)1512 void MCAsmStreamer::emitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
1513 unsigned SourceFileId,
1514 unsigned SourceLineNum,
1515 const MCSymbol *FnStartSym,
1516 const MCSymbol *FnEndSym) {
1517 OS << "\t.cv_inline_linetable\t" << PrimaryFunctionId << ' ' << SourceFileId
1518 << ' ' << SourceLineNum << ' ';
1519 FnStartSym->print(OS, MAI);
1520 OS << ' ';
1521 FnEndSym->print(OS, MAI);
1522 EmitEOL();
1523 this->MCStreamer::emitCVInlineLinetableDirective(
1524 PrimaryFunctionId, SourceFileId, SourceLineNum, FnStartSym, FnEndSym);
1525 }
1526
PrintCVDefRangePrefix(ArrayRef<std::pair<const MCSymbol *,const MCSymbol * >> Ranges)1527 void MCAsmStreamer::PrintCVDefRangePrefix(
1528 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges) {
1529 OS << "\t.cv_def_range\t";
1530 for (std::pair<const MCSymbol *, const MCSymbol *> Range : Ranges) {
1531 OS << ' ';
1532 Range.first->print(OS, MAI);
1533 OS << ' ';
1534 Range.second->print(OS, MAI);
1535 }
1536 }
1537
emitCVDefRangeDirective(ArrayRef<std::pair<const MCSymbol *,const MCSymbol * >> Ranges,codeview::DefRangeRegisterRelHeader DRHdr)1538 void MCAsmStreamer::emitCVDefRangeDirective(
1539 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
1540 codeview::DefRangeRegisterRelHeader DRHdr) {
1541 PrintCVDefRangePrefix(Ranges);
1542 OS << ", reg_rel, ";
1543 OS << DRHdr.Register << ", " << DRHdr.Flags << ", "
1544 << DRHdr.BasePointerOffset;
1545 EmitEOL();
1546 }
1547
emitCVDefRangeDirective(ArrayRef<std::pair<const MCSymbol *,const MCSymbol * >> Ranges,codeview::DefRangeSubfieldRegisterHeader DRHdr)1548 void MCAsmStreamer::emitCVDefRangeDirective(
1549 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
1550 codeview::DefRangeSubfieldRegisterHeader DRHdr) {
1551 PrintCVDefRangePrefix(Ranges);
1552 OS << ", subfield_reg, ";
1553 OS << DRHdr.Register << ", " << DRHdr.OffsetInParent;
1554 EmitEOL();
1555 }
1556
emitCVDefRangeDirective(ArrayRef<std::pair<const MCSymbol *,const MCSymbol * >> Ranges,codeview::DefRangeRegisterHeader DRHdr)1557 void MCAsmStreamer::emitCVDefRangeDirective(
1558 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
1559 codeview::DefRangeRegisterHeader DRHdr) {
1560 PrintCVDefRangePrefix(Ranges);
1561 OS << ", reg, ";
1562 OS << DRHdr.Register;
1563 EmitEOL();
1564 }
1565
emitCVDefRangeDirective(ArrayRef<std::pair<const MCSymbol *,const MCSymbol * >> Ranges,codeview::DefRangeFramePointerRelHeader DRHdr)1566 void MCAsmStreamer::emitCVDefRangeDirective(
1567 ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
1568 codeview::DefRangeFramePointerRelHeader DRHdr) {
1569 PrintCVDefRangePrefix(Ranges);
1570 OS << ", frame_ptr_rel, ";
1571 OS << DRHdr.Offset;
1572 EmitEOL();
1573 }
1574
emitCVStringTableDirective()1575 void MCAsmStreamer::emitCVStringTableDirective() {
1576 OS << "\t.cv_stringtable";
1577 EmitEOL();
1578 }
1579
emitCVFileChecksumsDirective()1580 void MCAsmStreamer::emitCVFileChecksumsDirective() {
1581 OS << "\t.cv_filechecksums";
1582 EmitEOL();
1583 }
1584
emitCVFileChecksumOffsetDirective(unsigned FileNo)1585 void MCAsmStreamer::emitCVFileChecksumOffsetDirective(unsigned FileNo) {
1586 OS << "\t.cv_filechecksumoffset\t" << FileNo;
1587 EmitEOL();
1588 }
1589
EmitCVFPOData(const MCSymbol * ProcSym,SMLoc L)1590 void MCAsmStreamer::EmitCVFPOData(const MCSymbol *ProcSym, SMLoc L) {
1591 OS << "\t.cv_fpo_data\t";
1592 ProcSym->print(OS, MAI);
1593 EmitEOL();
1594 }
1595
emitIdent(StringRef IdentString)1596 void MCAsmStreamer::emitIdent(StringRef IdentString) {
1597 assert(MAI->hasIdentDirective() && ".ident directive not supported");
1598 OS << "\t.ident\t";
1599 PrintQuotedString(IdentString, OS);
1600 EmitEOL();
1601 }
1602
emitCFISections(bool EH,bool Debug)1603 void MCAsmStreamer::emitCFISections(bool EH, bool Debug) {
1604 MCStreamer::emitCFISections(EH, Debug);
1605 OS << "\t.cfi_sections ";
1606 if (EH) {
1607 OS << ".eh_frame";
1608 if (Debug)
1609 OS << ", .debug_frame";
1610 } else if (Debug) {
1611 OS << ".debug_frame";
1612 }
1613
1614 EmitEOL();
1615 }
1616
emitCFIStartProcImpl(MCDwarfFrameInfo & Frame)1617 void MCAsmStreamer::emitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
1618 OS << "\t.cfi_startproc";
1619 if (Frame.IsSimple)
1620 OS << " simple";
1621 EmitEOL();
1622 }
1623
emitCFIEndProcImpl(MCDwarfFrameInfo & Frame)1624 void MCAsmStreamer::emitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
1625 MCStreamer::emitCFIEndProcImpl(Frame);
1626 OS << "\t.cfi_endproc";
1627 EmitEOL();
1628 }
1629
EmitRegisterName(int64_t Register)1630 void MCAsmStreamer::EmitRegisterName(int64_t Register) {
1631 if (!MAI->useDwarfRegNumForCFI()) {
1632 // User .cfi_* directives can use arbitrary DWARF register numbers, not
1633 // just ones that map to LLVM register numbers and have known names.
1634 // Fall back to using the original number directly if no name is known.
1635 const MCRegisterInfo *MRI = getContext().getRegisterInfo();
1636 if (Optional<unsigned> LLVMRegister = MRI->getLLVMRegNum(Register, true)) {
1637 InstPrinter->printRegName(OS, *LLVMRegister);
1638 return;
1639 }
1640 }
1641 OS << Register;
1642 }
1643
emitCFIDefCfa(int64_t Register,int64_t Offset)1644 void MCAsmStreamer::emitCFIDefCfa(int64_t Register, int64_t Offset) {
1645 MCStreamer::emitCFIDefCfa(Register, Offset);
1646 OS << "\t.cfi_def_cfa ";
1647 EmitRegisterName(Register);
1648 OS << ", " << Offset;
1649 EmitEOL();
1650 }
1651
emitCFIDefCfaOffset(int64_t Offset)1652 void MCAsmStreamer::emitCFIDefCfaOffset(int64_t Offset) {
1653 MCStreamer::emitCFIDefCfaOffset(Offset);
1654 OS << "\t.cfi_def_cfa_offset " << Offset;
1655 EmitEOL();
1656 }
1657
PrintCFIEscape(llvm::formatted_raw_ostream & OS,StringRef Values)1658 static void PrintCFIEscape(llvm::formatted_raw_ostream &OS, StringRef Values) {
1659 OS << "\t.cfi_escape ";
1660 if (!Values.empty()) {
1661 size_t e = Values.size() - 1;
1662 for (size_t i = 0; i < e; ++i)
1663 OS << format("0x%02x", uint8_t(Values[i])) << ", ";
1664 OS << format("0x%02x", uint8_t(Values[e]));
1665 }
1666 }
1667
emitCFIEscape(StringRef Values)1668 void MCAsmStreamer::emitCFIEscape(StringRef Values) {
1669 MCStreamer::emitCFIEscape(Values);
1670 PrintCFIEscape(OS, Values);
1671 EmitEOL();
1672 }
1673
emitCFIGnuArgsSize(int64_t Size)1674 void MCAsmStreamer::emitCFIGnuArgsSize(int64_t Size) {
1675 MCStreamer::emitCFIGnuArgsSize(Size);
1676
1677 uint8_t Buffer[16] = { dwarf::DW_CFA_GNU_args_size };
1678 unsigned Len = encodeULEB128(Size, Buffer + 1) + 1;
1679
1680 PrintCFIEscape(OS, StringRef((const char *)&Buffer[0], Len));
1681 EmitEOL();
1682 }
1683
emitCFIDefCfaRegister(int64_t Register)1684 void MCAsmStreamer::emitCFIDefCfaRegister(int64_t Register) {
1685 MCStreamer::emitCFIDefCfaRegister(Register);
1686 OS << "\t.cfi_def_cfa_register ";
1687 EmitRegisterName(Register);
1688 EmitEOL();
1689 }
1690
emitCFIOffset(int64_t Register,int64_t Offset)1691 void MCAsmStreamer::emitCFIOffset(int64_t Register, int64_t Offset) {
1692 this->MCStreamer::emitCFIOffset(Register, Offset);
1693 OS << "\t.cfi_offset ";
1694 EmitRegisterName(Register);
1695 OS << ", " << Offset;
1696 EmitEOL();
1697 }
1698
emitCFIPersonality(const MCSymbol * Sym,unsigned Encoding)1699 void MCAsmStreamer::emitCFIPersonality(const MCSymbol *Sym,
1700 unsigned Encoding) {
1701 MCStreamer::emitCFIPersonality(Sym, Encoding);
1702 OS << "\t.cfi_personality " << Encoding << ", ";
1703 Sym->print(OS, MAI);
1704 EmitEOL();
1705 }
1706
emitCFILsda(const MCSymbol * Sym,unsigned Encoding)1707 void MCAsmStreamer::emitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
1708 MCStreamer::emitCFILsda(Sym, Encoding);
1709 OS << "\t.cfi_lsda " << Encoding << ", ";
1710 Sym->print(OS, MAI);
1711 EmitEOL();
1712 }
1713
emitCFIRememberState()1714 void MCAsmStreamer::emitCFIRememberState() {
1715 MCStreamer::emitCFIRememberState();
1716 OS << "\t.cfi_remember_state";
1717 EmitEOL();
1718 }
1719
emitCFIRestoreState()1720 void MCAsmStreamer::emitCFIRestoreState() {
1721 MCStreamer::emitCFIRestoreState();
1722 OS << "\t.cfi_restore_state";
1723 EmitEOL();
1724 }
1725
emitCFIRestore(int64_t Register)1726 void MCAsmStreamer::emitCFIRestore(int64_t Register) {
1727 MCStreamer::emitCFIRestore(Register);
1728 OS << "\t.cfi_restore ";
1729 EmitRegisterName(Register);
1730 EmitEOL();
1731 }
1732
emitCFISameValue(int64_t Register)1733 void MCAsmStreamer::emitCFISameValue(int64_t Register) {
1734 MCStreamer::emitCFISameValue(Register);
1735 OS << "\t.cfi_same_value ";
1736 EmitRegisterName(Register);
1737 EmitEOL();
1738 }
1739
emitCFIRelOffset(int64_t Register,int64_t Offset)1740 void MCAsmStreamer::emitCFIRelOffset(int64_t Register, int64_t Offset) {
1741 MCStreamer::emitCFIRelOffset(Register, Offset);
1742 OS << "\t.cfi_rel_offset ";
1743 EmitRegisterName(Register);
1744 OS << ", " << Offset;
1745 EmitEOL();
1746 }
1747
emitCFIAdjustCfaOffset(int64_t Adjustment)1748 void MCAsmStreamer::emitCFIAdjustCfaOffset(int64_t Adjustment) {
1749 MCStreamer::emitCFIAdjustCfaOffset(Adjustment);
1750 OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
1751 EmitEOL();
1752 }
1753
emitCFISignalFrame()1754 void MCAsmStreamer::emitCFISignalFrame() {
1755 MCStreamer::emitCFISignalFrame();
1756 OS << "\t.cfi_signal_frame";
1757 EmitEOL();
1758 }
1759
emitCFIUndefined(int64_t Register)1760 void MCAsmStreamer::emitCFIUndefined(int64_t Register) {
1761 MCStreamer::emitCFIUndefined(Register);
1762 OS << "\t.cfi_undefined ";
1763 EmitRegisterName(Register);
1764 EmitEOL();
1765 }
1766
emitCFIRegister(int64_t Register1,int64_t Register2)1767 void MCAsmStreamer::emitCFIRegister(int64_t Register1, int64_t Register2) {
1768 MCStreamer::emitCFIRegister(Register1, Register2);
1769 OS << "\t.cfi_register ";
1770 EmitRegisterName(Register1);
1771 OS << ", ";
1772 EmitRegisterName(Register2);
1773 EmitEOL();
1774 }
1775
emitCFIWindowSave()1776 void MCAsmStreamer::emitCFIWindowSave() {
1777 MCStreamer::emitCFIWindowSave();
1778 OS << "\t.cfi_window_save";
1779 EmitEOL();
1780 }
1781
emitCFINegateRAState()1782 void MCAsmStreamer::emitCFINegateRAState() {
1783 MCStreamer::emitCFINegateRAState();
1784 OS << "\t.cfi_negate_ra_state";
1785 EmitEOL();
1786 }
1787
emitCFIReturnColumn(int64_t Register)1788 void MCAsmStreamer::emitCFIReturnColumn(int64_t Register) {
1789 MCStreamer::emitCFIReturnColumn(Register);
1790 OS << "\t.cfi_return_column ";
1791 EmitRegisterName(Register);
1792 EmitEOL();
1793 }
1794
emitCFIBKeyFrame()1795 void MCAsmStreamer::emitCFIBKeyFrame() {
1796 MCStreamer::emitCFIBKeyFrame();
1797 OS << "\t.cfi_b_key_frame";
1798 EmitEOL();
1799 }
1800
EmitWinCFIStartProc(const MCSymbol * Symbol,SMLoc Loc)1801 void MCAsmStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) {
1802 MCStreamer::EmitWinCFIStartProc(Symbol, Loc);
1803
1804 OS << ".seh_proc ";
1805 Symbol->print(OS, MAI);
1806 EmitEOL();
1807 }
1808
EmitWinCFIEndProc(SMLoc Loc)1809 void MCAsmStreamer::EmitWinCFIEndProc(SMLoc Loc) {
1810 MCStreamer::EmitWinCFIEndProc(Loc);
1811
1812 OS << "\t.seh_endproc";
1813 EmitEOL();
1814 }
1815
1816 // TODO: Implement
EmitWinCFIFuncletOrFuncEnd(SMLoc Loc)1817 void MCAsmStreamer::EmitWinCFIFuncletOrFuncEnd(SMLoc Loc) {
1818 }
1819
EmitWinCFIStartChained(SMLoc Loc)1820 void MCAsmStreamer::EmitWinCFIStartChained(SMLoc Loc) {
1821 MCStreamer::EmitWinCFIStartChained(Loc);
1822
1823 OS << "\t.seh_startchained";
1824 EmitEOL();
1825 }
1826
EmitWinCFIEndChained(SMLoc Loc)1827 void MCAsmStreamer::EmitWinCFIEndChained(SMLoc Loc) {
1828 MCStreamer::EmitWinCFIEndChained(Loc);
1829
1830 OS << "\t.seh_endchained";
1831 EmitEOL();
1832 }
1833
EmitWinEHHandler(const MCSymbol * Sym,bool Unwind,bool Except,SMLoc Loc)1834 void MCAsmStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
1835 bool Except, SMLoc Loc) {
1836 MCStreamer::EmitWinEHHandler(Sym, Unwind, Except, Loc);
1837
1838 OS << "\t.seh_handler ";
1839 Sym->print(OS, MAI);
1840 if (Unwind)
1841 OS << ", @unwind";
1842 if (Except)
1843 OS << ", @except";
1844 EmitEOL();
1845 }
1846
EmitWinEHHandlerData(SMLoc Loc)1847 void MCAsmStreamer::EmitWinEHHandlerData(SMLoc Loc) {
1848 MCStreamer::EmitWinEHHandlerData(Loc);
1849
1850 // Switch sections. Don't call SwitchSection directly, because that will
1851 // cause the section switch to be visible in the emitted assembly.
1852 // We only do this so the section switch that terminates the handler
1853 // data block is visible.
1854 WinEH::FrameInfo *CurFrame = getCurrentWinFrameInfo();
1855
1856 // Do nothing if no frame is open. MCStreamer should've already reported an
1857 // error.
1858 if (!CurFrame)
1859 return;
1860
1861 MCSection *TextSec = &CurFrame->Function->getSection();
1862 MCSection *XData = getAssociatedXDataSection(TextSec);
1863 SwitchSectionNoChange(XData);
1864
1865 OS << "\t.seh_handlerdata";
1866 EmitEOL();
1867 }
1868
EmitWinCFIPushReg(MCRegister Register,SMLoc Loc)1869 void MCAsmStreamer::EmitWinCFIPushReg(MCRegister Register, SMLoc Loc) {
1870 MCStreamer::EmitWinCFIPushReg(Register, Loc);
1871
1872 OS << "\t.seh_pushreg ";
1873 InstPrinter->printRegName(OS, Register);
1874 EmitEOL();
1875 }
1876
EmitWinCFISetFrame(MCRegister Register,unsigned Offset,SMLoc Loc)1877 void MCAsmStreamer::EmitWinCFISetFrame(MCRegister Register, unsigned Offset,
1878 SMLoc Loc) {
1879 MCStreamer::EmitWinCFISetFrame(Register, Offset, Loc);
1880
1881 OS << "\t.seh_setframe ";
1882 InstPrinter->printRegName(OS, Register);
1883 OS << ", " << Offset;
1884 EmitEOL();
1885 }
1886
EmitWinCFIAllocStack(unsigned Size,SMLoc Loc)1887 void MCAsmStreamer::EmitWinCFIAllocStack(unsigned Size, SMLoc Loc) {
1888 MCStreamer::EmitWinCFIAllocStack(Size, Loc);
1889
1890 OS << "\t.seh_stackalloc " << Size;
1891 EmitEOL();
1892 }
1893
EmitWinCFISaveReg(MCRegister Register,unsigned Offset,SMLoc Loc)1894 void MCAsmStreamer::EmitWinCFISaveReg(MCRegister Register, unsigned Offset,
1895 SMLoc Loc) {
1896 MCStreamer::EmitWinCFISaveReg(Register, Offset, Loc);
1897
1898 OS << "\t.seh_savereg ";
1899 InstPrinter->printRegName(OS, Register);
1900 OS << ", " << Offset;
1901 EmitEOL();
1902 }
1903
EmitWinCFISaveXMM(MCRegister Register,unsigned Offset,SMLoc Loc)1904 void MCAsmStreamer::EmitWinCFISaveXMM(MCRegister Register, unsigned Offset,
1905 SMLoc Loc) {
1906 MCStreamer::EmitWinCFISaveXMM(Register, Offset, Loc);
1907
1908 OS << "\t.seh_savexmm ";
1909 InstPrinter->printRegName(OS, Register);
1910 OS << ", " << Offset;
1911 EmitEOL();
1912 }
1913
EmitWinCFIPushFrame(bool Code,SMLoc Loc)1914 void MCAsmStreamer::EmitWinCFIPushFrame(bool Code, SMLoc Loc) {
1915 MCStreamer::EmitWinCFIPushFrame(Code, Loc);
1916
1917 OS << "\t.seh_pushframe";
1918 if (Code)
1919 OS << " @code";
1920 EmitEOL();
1921 }
1922
EmitWinCFIEndProlog(SMLoc Loc)1923 void MCAsmStreamer::EmitWinCFIEndProlog(SMLoc Loc) {
1924 MCStreamer::EmitWinCFIEndProlog(Loc);
1925
1926 OS << "\t.seh_endprologue";
1927 EmitEOL();
1928 }
1929
emitCGProfileEntry(const MCSymbolRefExpr * From,const MCSymbolRefExpr * To,uint64_t Count)1930 void MCAsmStreamer::emitCGProfileEntry(const MCSymbolRefExpr *From,
1931 const MCSymbolRefExpr *To,
1932 uint64_t Count) {
1933 OS << "\t.cg_profile ";
1934 From->getSymbol().print(OS, MAI);
1935 OS << ", ";
1936 To->getSymbol().print(OS, MAI);
1937 OS << ", " << Count;
1938 EmitEOL();
1939 }
1940
AddEncodingComment(const MCInst & Inst,const MCSubtargetInfo & STI)1941 void MCAsmStreamer::AddEncodingComment(const MCInst &Inst,
1942 const MCSubtargetInfo &STI) {
1943 raw_ostream &OS = GetCommentOS();
1944 SmallString<256> Code;
1945 SmallVector<MCFixup, 4> Fixups;
1946 raw_svector_ostream VecOS(Code);
1947
1948 // If we have no code emitter, don't emit code.
1949 if (!getAssembler().getEmitterPtr())
1950 return;
1951
1952 getAssembler().getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
1953
1954 // If we are showing fixups, create symbolic markers in the encoded
1955 // representation. We do this by making a per-bit map to the fixup item index,
1956 // then trying to display it as nicely as possible.
1957 SmallVector<uint8_t, 64> FixupMap;
1958 FixupMap.resize(Code.size() * 8);
1959 for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
1960 FixupMap[i] = 0;
1961
1962 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
1963 MCFixup &F = Fixups[i];
1964 const MCFixupKindInfo &Info =
1965 getAssembler().getBackend().getFixupKindInfo(F.getKind());
1966 for (unsigned j = 0; j != Info.TargetSize; ++j) {
1967 unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
1968 assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
1969 FixupMap[Index] = 1 + i;
1970 }
1971 }
1972
1973 // FIXME: Note the fixup comments for Thumb2 are completely bogus since the
1974 // high order halfword of a 32-bit Thumb2 instruction is emitted first.
1975 OS << "encoding: [";
1976 for (unsigned i = 0, e = Code.size(); i != e; ++i) {
1977 if (i)
1978 OS << ',';
1979
1980 // See if all bits are the same map entry.
1981 uint8_t MapEntry = FixupMap[i * 8 + 0];
1982 for (unsigned j = 1; j != 8; ++j) {
1983 if (FixupMap[i * 8 + j] == MapEntry)
1984 continue;
1985
1986 MapEntry = uint8_t(~0U);
1987 break;
1988 }
1989
1990 if (MapEntry != uint8_t(~0U)) {
1991 if (MapEntry == 0) {
1992 OS << format("0x%02x", uint8_t(Code[i]));
1993 } else {
1994 if (Code[i]) {
1995 // FIXME: Some of the 8 bits require fix up.
1996 OS << format("0x%02x", uint8_t(Code[i])) << '\''
1997 << char('A' + MapEntry - 1) << '\'';
1998 } else
1999 OS << char('A' + MapEntry - 1);
2000 }
2001 } else {
2002 // Otherwise, write out in binary.
2003 OS << "0b";
2004 for (unsigned j = 8; j--;) {
2005 unsigned Bit = (Code[i] >> j) & 1;
2006
2007 unsigned FixupBit;
2008 if (MAI->isLittleEndian())
2009 FixupBit = i * 8 + j;
2010 else
2011 FixupBit = i * 8 + (7-j);
2012
2013 if (uint8_t MapEntry = FixupMap[FixupBit]) {
2014 assert(Bit == 0 && "Encoder wrote into fixed up bit!");
2015 OS << char('A' + MapEntry - 1);
2016 } else
2017 OS << Bit;
2018 }
2019 }
2020 }
2021 OS << "]\n";
2022
2023 for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
2024 MCFixup &F = Fixups[i];
2025 const MCFixupKindInfo &Info =
2026 getAssembler().getBackend().getFixupKindInfo(F.getKind());
2027 OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
2028 << ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
2029 }
2030 }
2031
emitInstruction(const MCInst & Inst,const MCSubtargetInfo & STI)2032 void MCAsmStreamer::emitInstruction(const MCInst &Inst,
2033 const MCSubtargetInfo &STI) {
2034 assert(getCurrentSectionOnly() &&
2035 "Cannot emit contents before setting section!");
2036
2037 // Show the encoding in a comment if we have a code emitter.
2038 AddEncodingComment(Inst, STI);
2039
2040 // Show the MCInst if enabled.
2041 if (ShowInst) {
2042 Inst.dump_pretty(GetCommentOS(), InstPrinter.get(), "\n ");
2043 GetCommentOS() << "\n";
2044 }
2045
2046 if(getTargetStreamer())
2047 getTargetStreamer()->prettyPrintAsm(*InstPrinter, 0, Inst, STI, OS);
2048 else
2049 InstPrinter->printInst(&Inst, 0, "", STI, OS);
2050
2051 StringRef Comments = CommentToEmit;
2052 if (Comments.size() && Comments.back() != '\n')
2053 GetCommentOS() << "\n";
2054
2055 EmitEOL();
2056 }
2057
emitBundleAlignMode(unsigned AlignPow2)2058 void MCAsmStreamer::emitBundleAlignMode(unsigned AlignPow2) {
2059 OS << "\t.bundle_align_mode " << AlignPow2;
2060 EmitEOL();
2061 }
2062
emitBundleLock(bool AlignToEnd)2063 void MCAsmStreamer::emitBundleLock(bool AlignToEnd) {
2064 OS << "\t.bundle_lock";
2065 if (AlignToEnd)
2066 OS << " align_to_end";
2067 EmitEOL();
2068 }
2069
emitBundleUnlock()2070 void MCAsmStreamer::emitBundleUnlock() {
2071 OS << "\t.bundle_unlock";
2072 EmitEOL();
2073 }
2074
2075 Optional<std::pair<bool, std::string>>
emitRelocDirective(const MCExpr & Offset,StringRef Name,const MCExpr * Expr,SMLoc,const MCSubtargetInfo & STI)2076 MCAsmStreamer::emitRelocDirective(const MCExpr &Offset, StringRef Name,
2077 const MCExpr *Expr, SMLoc,
2078 const MCSubtargetInfo &STI) {
2079 OS << "\t.reloc ";
2080 Offset.print(OS, MAI);
2081 OS << ", " << Name;
2082 if (Expr) {
2083 OS << ", ";
2084 Expr->print(OS, MAI);
2085 }
2086 EmitEOL();
2087 return None;
2088 }
2089
emitAddrsig()2090 void MCAsmStreamer::emitAddrsig() {
2091 OS << "\t.addrsig";
2092 EmitEOL();
2093 }
2094
emitAddrsigSym(const MCSymbol * Sym)2095 void MCAsmStreamer::emitAddrsigSym(const MCSymbol *Sym) {
2096 OS << "\t.addrsig_sym ";
2097 Sym->print(OS, MAI);
2098 EmitEOL();
2099 }
2100
2101 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
2102 /// the specified string in the output .s file. This capability is
2103 /// indicated by the hasRawTextSupport() predicate.
emitRawTextImpl(StringRef String)2104 void MCAsmStreamer::emitRawTextImpl(StringRef String) {
2105 if (!String.empty() && String.back() == '\n')
2106 String = String.substr(0, String.size()-1);
2107 OS << String;
2108 EmitEOL();
2109 }
2110
finishImpl()2111 void MCAsmStreamer::finishImpl() {
2112 // If we are generating dwarf for assembly source files dump out the sections.
2113 if (getContext().getGenDwarfForAssembly())
2114 MCGenDwarfInfo::Emit(this);
2115
2116 // Emit the label for the line table, if requested - since the rest of the
2117 // line table will be defined by .loc/.file directives, and not emitted
2118 // directly, the label is the only work required here.
2119 const auto &Tables = getContext().getMCDwarfLineTables();
2120 if (!Tables.empty()) {
2121 assert(Tables.size() == 1 && "asm output only supports one line table");
2122 if (auto *Label = Tables.begin()->second.getLabel()) {
2123 SwitchSection(getContext().getObjectFileInfo()->getDwarfLineSection());
2124 emitLabel(Label);
2125 }
2126 }
2127 }
2128
createAsmStreamer(MCContext & Context,std::unique_ptr<formatted_raw_ostream> OS,bool isVerboseAsm,bool useDwarfDirectory,MCInstPrinter * IP,std::unique_ptr<MCCodeEmitter> && CE,std::unique_ptr<MCAsmBackend> && MAB,bool ShowInst)2129 MCStreamer *llvm::createAsmStreamer(MCContext &Context,
2130 std::unique_ptr<formatted_raw_ostream> OS,
2131 bool isVerboseAsm, bool useDwarfDirectory,
2132 MCInstPrinter *IP,
2133 std::unique_ptr<MCCodeEmitter> &&CE,
2134 std::unique_ptr<MCAsmBackend> &&MAB,
2135 bool ShowInst) {
2136 return new MCAsmStreamer(Context, std::move(OS), isVerboseAsm,
2137 useDwarfDirectory, IP, std::move(CE), std::move(MAB),
2138 ShowInst);
2139 }
2140