LLVM  15.0.0git
AsmParser.cpp
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1 //===- AsmParser.cpp - Parser for Assembly Files --------------------------===//
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 // This class implements a parser for assembly files similar to gas syntax.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "llvm/ADT/APFloat.h"
14 #include "llvm/ADT/APInt.h"
15 #include "llvm/ADT/ArrayRef.h"
16 #include "llvm/ADT/None.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/SmallSet.h"
19 #include "llvm/ADT/SmallString.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/ADT/StringExtras.h"
22 #include "llvm/ADT/StringMap.h"
23 #include "llvm/ADT/StringRef.h"
24 #include "llvm/ADT/Twine.h"
27 #include "llvm/MC/MCAsmInfo.h"
28 #include "llvm/MC/MCCodeView.h"
29 #include "llvm/MC/MCContext.h"
30 #include "llvm/MC/MCDirectives.h"
31 #include "llvm/MC/MCDwarf.h"
32 #include "llvm/MC/MCExpr.h"
33 #include "llvm/MC/MCInstPrinter.h"
34 #include "llvm/MC/MCInstrDesc.h"
35 #include "llvm/MC/MCInstrInfo.h"
44 #include "llvm/MC/MCRegisterInfo.h"
45 #include "llvm/MC/MCSection.h"
46 #include "llvm/MC/MCStreamer.h"
47 #include "llvm/MC/MCSymbol.h"
49 #include "llvm/MC/MCValue.h"
50 #include "llvm/Support/Casting.h"
53 #include "llvm/Support/MD5.h"
56 #include "llvm/Support/SMLoc.h"
57 #include "llvm/Support/SourceMgr.h"
59 #include <algorithm>
60 #include <cassert>
61 #include <cctype>
62 #include <climits>
63 #include <cstddef>
64 #include <cstdint>
65 #include <deque>
66 #include <memory>
67 #include <sstream>
68 #include <string>
69 #include <tuple>
70 #include <utility>
71 #include <vector>
72 
73 using namespace llvm;
74 
76 
78 
79 namespace {
80 
81 /// Helper types for tracking macro definitions.
82 typedef std::vector<AsmToken> MCAsmMacroArgument;
83 typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments;
84 
85 /// Helper class for storing information about an active macro
86 /// instantiation.
87 struct MacroInstantiation {
88  /// The location of the instantiation.
89  SMLoc InstantiationLoc;
90 
91  /// The buffer where parsing should resume upon instantiation completion.
92  unsigned ExitBuffer;
93 
94  /// The location where parsing should resume upon instantiation completion.
95  SMLoc ExitLoc;
96 
97  /// The depth of TheCondStack at the start of the instantiation.
98  size_t CondStackDepth;
99 };
100 
101 struct ParseStatementInfo {
102  /// The parsed operands from the last parsed statement.
104 
105  /// The opcode from the last parsed instruction.
106  unsigned Opcode = ~0U;
107 
108  /// Was there an error parsing the inline assembly?
109  bool ParseError = false;
110 
111  SmallVectorImpl<AsmRewrite> *AsmRewrites = nullptr;
112 
113  ParseStatementInfo() = delete;
114  ParseStatementInfo(SmallVectorImpl<AsmRewrite> *rewrites)
115  : AsmRewrites(rewrites) {}
116 };
117 
118 /// The concrete assembly parser instance.
119 class AsmParser : public MCAsmParser {
120 private:
121  AsmLexer Lexer;
122  MCContext &Ctx;
123  MCStreamer &Out;
124  const MCAsmInfo &MAI;
125  SourceMgr &SrcMgr;
126  SourceMgr::DiagHandlerTy SavedDiagHandler;
127  void *SavedDiagContext;
128  std::unique_ptr<MCAsmParserExtension> PlatformParser;
129  SMLoc StartTokLoc;
130 
131  /// This is the current buffer index we're lexing from as managed by the
132  /// SourceMgr object.
133  unsigned CurBuffer;
134 
135  AsmCond TheCondState;
136  std::vector<AsmCond> TheCondStack;
137 
138  /// maps directive names to handler methods in parser
139  /// extensions. Extensions register themselves in this map by calling
140  /// addDirectiveHandler.
141  StringMap<ExtensionDirectiveHandler> ExtensionDirectiveMap;
142 
143  /// Stack of active macro instantiations.
144  std::vector<MacroInstantiation*> ActiveMacros;
145 
146  /// List of bodies of anonymous macros.
147  std::deque<MCAsmMacro> MacroLikeBodies;
148 
149  /// Boolean tracking whether macro substitution is enabled.
150  unsigned MacrosEnabledFlag : 1;
151 
152  /// Keeps track of how many .macro's have been instantiated.
153  unsigned NumOfMacroInstantiations;
154 
155  /// The values from the last parsed cpp hash file line comment if any.
156  struct CppHashInfoTy {
157  StringRef Filename;
158  int64_t LineNumber;
159  SMLoc Loc;
160  unsigned Buf;
161  CppHashInfoTy() : LineNumber(0), Buf(0) {}
162  };
163  CppHashInfoTy CppHashInfo;
164 
165  /// The filename from the first cpp hash file line comment, if any.
166  StringRef FirstCppHashFilename;
167 
168  /// List of forward directional labels for diagnosis at the end.
170 
171  SmallSet<StringRef, 2> LTODiscardSymbols;
172 
173  /// AssemblerDialect. ~OU means unset value and use value provided by MAI.
174  unsigned AssemblerDialect = ~0U;
175 
176  /// is Darwin compatibility enabled?
177  bool IsDarwin = false;
178 
179  /// Are we parsing ms-style inline assembly?
180  bool ParsingMSInlineAsm = false;
181 
182  /// Did we already inform the user about inconsistent MD5 usage?
183  bool ReportedInconsistentMD5 = false;
184 
185  // Is alt macro mode enabled.
186  bool AltMacroMode = false;
187 
188 protected:
189  virtual bool parseStatement(ParseStatementInfo &Info,
191 
192  /// This routine uses the target specific ParseInstruction function to
193  /// parse an instruction into Operands, and then call the target specific
194  /// MatchAndEmit function to match and emit the instruction.
195  bool parseAndMatchAndEmitTargetInstruction(ParseStatementInfo &Info,
196  StringRef IDVal, AsmToken ID,
197  SMLoc IDLoc);
198 
199  /// Should we emit DWARF describing this assembler source? (Returns false if
200  /// the source has .file directives, which means we don't want to generate
201  /// info describing the assembler source itself.)
202  bool enabledGenDwarfForAssembly();
203 
204 public:
205  AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
206  const MCAsmInfo &MAI, unsigned CB);
207  AsmParser(const AsmParser &) = delete;
208  AsmParser &operator=(const AsmParser &) = delete;
209  ~AsmParser() override;
210 
211  bool Run(bool NoInitialTextSection, bool NoFinalize = false) override;
212 
213  void addDirectiveHandler(StringRef Directive,
214  ExtensionDirectiveHandler Handler) override {
215  ExtensionDirectiveMap[Directive] = Handler;
216  }
217 
218  void addAliasForDirective(StringRef Directive, StringRef Alias) override {
219  DirectiveKindMap[Directive.lower()] = DirectiveKindMap[Alias.lower()];
220  }
221 
222  /// @name MCAsmParser Interface
223  /// {
224 
225  SourceMgr &getSourceManager() override { return SrcMgr; }
226  MCAsmLexer &getLexer() override { return Lexer; }
227  MCContext &getContext() override { return Ctx; }
228  MCStreamer &getStreamer() override { return Out; }
229 
230  CodeViewContext &getCVContext() { return Ctx.getCVContext(); }
231 
232  unsigned getAssemblerDialect() override {
233  if (AssemblerDialect == ~0U)
234  return MAI.getAssemblerDialect();
235  else
236  return AssemblerDialect;
237  }
238  void setAssemblerDialect(unsigned i) override {
239  AssemblerDialect = i;
240  }
241 
242  void Note(SMLoc L, const Twine &Msg, SMRange Range = None) override;
243  bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) override;
244  bool printError(SMLoc L, const Twine &Msg, SMRange Range = None) override;
245 
246  const AsmToken &Lex() override;
247 
248  void setParsingMSInlineAsm(bool V) override {
249  ParsingMSInlineAsm = V;
250  // When parsing MS inline asm, we must lex 0b1101 and 0ABCH as binary and
251  // hex integer literals.
252  Lexer.setLexMasmIntegers(V);
253  }
254  bool isParsingMSInlineAsm() override { return ParsingMSInlineAsm; }
255 
256  bool discardLTOSymbol(StringRef Name) const override {
257  return LTODiscardSymbols.contains(Name);
258  }
259 
260  bool parseMSInlineAsm(std::string &AsmString, unsigned &NumOutputs,
261  unsigned &NumInputs,
262  SmallVectorImpl<std::pair<void *, bool>> &OpDecls,
263  SmallVectorImpl<std::string> &Constraints,
265  const MCInstrInfo *MII, const MCInstPrinter *IP,
266  MCAsmParserSemaCallback &SI) override;
267 
268  bool parseExpression(const MCExpr *&Res);
269  bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
270  bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc,
271  AsmTypeInfo *TypeInfo) override;
272  bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) override;
273  bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
274  SMLoc &EndLoc) override;
275  bool parseAbsoluteExpression(int64_t &Res) override;
276 
277  /// Parse a floating point expression using the float \p Semantics
278  /// and set \p Res to the value.
279  bool parseRealValue(const fltSemantics &Semantics, APInt &Res);
280 
281  /// Parse an identifier or string (as a quoted identifier)
282  /// and set \p Res to the identifier contents.
283  bool parseIdentifier(StringRef &Res) override;
284  void eatToEndOfStatement() override;
285 
286  bool checkForValidSection() override;
287 
288  /// }
289 
290 private:
291  bool parseCurlyBlockScope(SmallVectorImpl<AsmRewrite>& AsmStrRewrites);
292  bool parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo = true);
293 
294  void checkForBadMacro(SMLoc DirectiveLoc, StringRef Name, StringRef Body,
295  ArrayRef<MCAsmMacroParameter> Parameters);
296  bool expandMacro(raw_svector_ostream &OS, StringRef Body,
298  ArrayRef<MCAsmMacroArgument> A, bool EnableAtPseudoVariable,
299  SMLoc L);
300 
301  /// Are macros enabled in the parser?
302  bool areMacrosEnabled() {return MacrosEnabledFlag;}
303 
304  /// Control a flag in the parser that enables or disables macros.
305  void setMacrosEnabled(bool Flag) {MacrosEnabledFlag = Flag;}
306 
307  /// Are we inside a macro instantiation?
308  bool isInsideMacroInstantiation() {return !ActiveMacros.empty();}
309 
310  /// Handle entry to macro instantiation.
311  ///
312  /// \param M The macro.
313  /// \param NameLoc Instantiation location.
314  bool handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc);
315 
316  /// Handle exit from macro instantiation.
317  void handleMacroExit();
318 
319  /// Extract AsmTokens for a macro argument.
320  bool parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg);
321 
322  /// Parse all macro arguments for a given macro.
323  bool parseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A);
324 
325  void printMacroInstantiations();
326  void printMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg,
327  SMRange Range = None) const {
328  ArrayRef<SMRange> Ranges(Range);
329  SrcMgr.PrintMessage(Loc, Kind, Msg, Ranges);
330  }
331  static void DiagHandler(const SMDiagnostic &Diag, void *Context);
332 
333  /// Enter the specified file. This returns true on failure.
334  bool enterIncludeFile(const std::string &Filename);
335 
336  /// Process the specified file for the .incbin directive.
337  /// This returns true on failure.
338  bool processIncbinFile(const std::string &Filename, int64_t Skip = 0,
339  const MCExpr *Count = nullptr, SMLoc Loc = SMLoc());
340 
341  /// Reset the current lexer position to that given by \p Loc. The
342  /// current token is not set; clients should ensure Lex() is called
343  /// subsequently.
344  ///
345  /// \param InBuffer If not 0, should be the known buffer id that contains the
346  /// location.
347  void jumpToLoc(SMLoc Loc, unsigned InBuffer = 0);
348 
349  /// Parse up to the end of statement and a return the contents from the
350  /// current token until the end of the statement; the current token on exit
351  /// will be either the EndOfStatement or EOF.
352  StringRef parseStringToEndOfStatement() override;
353 
354  /// Parse until the end of a statement or a comma is encountered,
355  /// return the contents from the current token up to the end or comma.
356  StringRef parseStringToComma();
357 
358  enum class AssignmentKind {
359  Set,
360  Equiv,
361  Equal,
362  LTOSetConditional,
363  };
364 
365  bool parseAssignment(StringRef Name, AssignmentKind Kind);
366 
367  unsigned getBinOpPrecedence(AsmToken::TokenKind K,
369 
370  bool parseBinOpRHS(unsigned Precedence, const MCExpr *&Res, SMLoc &EndLoc);
371  bool parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc);
372  bool parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc);
373 
374  bool parseRegisterOrRegisterNumber(int64_t &Register, SMLoc DirectiveLoc);
375 
376  bool parseCVFunctionId(int64_t &FunctionId, StringRef DirectiveName);
377  bool parseCVFileId(int64_t &FileId, StringRef DirectiveName);
378 
379  // Generic (target and platform independent) directive parsing.
380  enum DirectiveKind {
381  DK_NO_DIRECTIVE, // Placeholder
382  DK_SET,
383  DK_EQU,
384  DK_EQUIV,
385  DK_ASCII,
386  DK_ASCIZ,
387  DK_STRING,
388  DK_BYTE,
389  DK_SHORT,
390  DK_RELOC,
391  DK_VALUE,
392  DK_2BYTE,
393  DK_LONG,
394  DK_INT,
395  DK_4BYTE,
396  DK_QUAD,
397  DK_8BYTE,
398  DK_OCTA,
399  DK_DC,
400  DK_DC_A,
401  DK_DC_B,
402  DK_DC_D,
403  DK_DC_L,
404  DK_DC_S,
405  DK_DC_W,
406  DK_DC_X,
407  DK_DCB,
408  DK_DCB_B,
409  DK_DCB_D,
410  DK_DCB_L,
411  DK_DCB_S,
412  DK_DCB_W,
413  DK_DCB_X,
414  DK_DS,
415  DK_DS_B,
416  DK_DS_D,
417  DK_DS_L,
418  DK_DS_P,
419  DK_DS_S,
420  DK_DS_W,
421  DK_DS_X,
422  DK_SINGLE,
423  DK_FLOAT,
424  DK_DOUBLE,
425  DK_ALIGN,
426  DK_ALIGN32,
427  DK_BALIGN,
428  DK_BALIGNW,
429  DK_BALIGNL,
430  DK_P2ALIGN,
431  DK_P2ALIGNW,
432  DK_P2ALIGNL,
433  DK_ORG,
434  DK_FILL,
435  DK_ENDR,
436  DK_BUNDLE_ALIGN_MODE,
437  DK_BUNDLE_LOCK,
438  DK_BUNDLE_UNLOCK,
439  DK_ZERO,
440  DK_EXTERN,
441  DK_GLOBL,
442  DK_GLOBAL,
443  DK_LAZY_REFERENCE,
444  DK_NO_DEAD_STRIP,
445  DK_SYMBOL_RESOLVER,
446  DK_PRIVATE_EXTERN,
447  DK_REFERENCE,
448  DK_WEAK_DEFINITION,
449  DK_WEAK_REFERENCE,
450  DK_WEAK_DEF_CAN_BE_HIDDEN,
451  DK_COLD,
452  DK_COMM,
453  DK_COMMON,
454  DK_LCOMM,
455  DK_ABORT,
456  DK_INCLUDE,
457  DK_INCBIN,
458  DK_CODE16,
459  DK_CODE16GCC,
460  DK_REPT,
461  DK_IRP,
462  DK_IRPC,
463  DK_IF,
464  DK_IFEQ,
465  DK_IFGE,
466  DK_IFGT,
467  DK_IFLE,
468  DK_IFLT,
469  DK_IFNE,
470  DK_IFB,
471  DK_IFNB,
472  DK_IFC,
473  DK_IFEQS,
474  DK_IFNC,
475  DK_IFNES,
476  DK_IFDEF,
477  DK_IFNDEF,
478  DK_IFNOTDEF,
479  DK_ELSEIF,
480  DK_ELSE,
481  DK_ENDIF,
482  DK_SPACE,
483  DK_SKIP,
484  DK_FILE,
485  DK_LINE,
486  DK_LOC,
487  DK_STABS,
488  DK_CV_FILE,
489  DK_CV_FUNC_ID,
490  DK_CV_INLINE_SITE_ID,
491  DK_CV_LOC,
492  DK_CV_LINETABLE,
493  DK_CV_INLINE_LINETABLE,
494  DK_CV_DEF_RANGE,
495  DK_CV_STRINGTABLE,
496  DK_CV_STRING,
497  DK_CV_FILECHECKSUMS,
498  DK_CV_FILECHECKSUM_OFFSET,
499  DK_CV_FPO_DATA,
500  DK_CFI_SECTIONS,
501  DK_CFI_STARTPROC,
502  DK_CFI_ENDPROC,
503  DK_CFI_DEF_CFA,
504  DK_CFI_DEF_CFA_OFFSET,
505  DK_CFI_ADJUST_CFA_OFFSET,
506  DK_CFI_DEF_CFA_REGISTER,
507  DK_CFI_LLVM_DEF_ASPACE_CFA,
508  DK_CFI_OFFSET,
509  DK_CFI_REL_OFFSET,
510  DK_CFI_PERSONALITY,
511  DK_CFI_LSDA,
512  DK_CFI_REMEMBER_STATE,
513  DK_CFI_RESTORE_STATE,
514  DK_CFI_SAME_VALUE,
515  DK_CFI_RESTORE,
516  DK_CFI_ESCAPE,
517  DK_CFI_RETURN_COLUMN,
518  DK_CFI_SIGNAL_FRAME,
519  DK_CFI_UNDEFINED,
520  DK_CFI_REGISTER,
521  DK_CFI_WINDOW_SAVE,
522  DK_CFI_B_KEY_FRAME,
523  DK_MACROS_ON,
524  DK_MACROS_OFF,
525  DK_ALTMACRO,
526  DK_NOALTMACRO,
527  DK_MACRO,
528  DK_EXITM,
529  DK_ENDM,
530  DK_ENDMACRO,
531  DK_PURGEM,
532  DK_SLEB128,
533  DK_ULEB128,
534  DK_ERR,
535  DK_ERROR,
536  DK_WARNING,
537  DK_PRINT,
538  DK_ADDRSIG,
539  DK_ADDRSIG_SYM,
540  DK_PSEUDO_PROBE,
541  DK_LTO_DISCARD,
542  DK_LTO_SET_CONDITIONAL,
543  DK_END
544  };
545 
546  /// Maps directive name --> DirectiveKind enum, for
547  /// directives parsed by this class.
548  StringMap<DirectiveKind> DirectiveKindMap;
549 
550  // Codeview def_range type parsing.
551  enum CVDefRangeType {
552  CVDR_DEFRANGE = 0, // Placeholder
553  CVDR_DEFRANGE_REGISTER,
554  CVDR_DEFRANGE_FRAMEPOINTER_REL,
555  CVDR_DEFRANGE_SUBFIELD_REGISTER,
556  CVDR_DEFRANGE_REGISTER_REL
557  };
558 
559  /// Maps Codeview def_range types --> CVDefRangeType enum, for
560  /// Codeview def_range types parsed by this class.
561  StringMap<CVDefRangeType> CVDefRangeTypeMap;
562 
563  // ".ascii", ".asciz", ".string"
564  bool parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated);
565  bool parseDirectiveReloc(SMLoc DirectiveLoc); // ".reloc"
566  bool parseDirectiveValue(StringRef IDVal,
567  unsigned Size); // ".byte", ".long", ...
568  bool parseDirectiveOctaValue(StringRef IDVal); // ".octa", ...
569  bool parseDirectiveRealValue(StringRef IDVal,
570  const fltSemantics &); // ".single", ...
571  bool parseDirectiveFill(); // ".fill"
572  bool parseDirectiveZero(); // ".zero"
573  // ".set", ".equ", ".equiv", ".lto_set_conditional"
574  bool parseDirectiveSet(StringRef IDVal, AssignmentKind Kind);
575  bool parseDirectiveOrg(); // ".org"
576  // ".align{,32}", ".p2align{,w,l}"
577  bool parseDirectiveAlign(bool IsPow2, unsigned ValueSize);
578 
579  // ".file", ".line", ".loc", ".stabs"
580  bool parseDirectiveFile(SMLoc DirectiveLoc);
581  bool parseDirectiveLine();
582  bool parseDirectiveLoc();
583  bool parseDirectiveStabs();
584 
585  // ".cv_file", ".cv_func_id", ".cv_inline_site_id", ".cv_loc", ".cv_linetable",
586  // ".cv_inline_linetable", ".cv_def_range", ".cv_string"
587  bool parseDirectiveCVFile();
588  bool parseDirectiveCVFuncId();
589  bool parseDirectiveCVInlineSiteId();
590  bool parseDirectiveCVLoc();
591  bool parseDirectiveCVLinetable();
592  bool parseDirectiveCVInlineLinetable();
593  bool parseDirectiveCVDefRange();
594  bool parseDirectiveCVString();
595  bool parseDirectiveCVStringTable();
596  bool parseDirectiveCVFileChecksums();
597  bool parseDirectiveCVFileChecksumOffset();
598  bool parseDirectiveCVFPOData();
599 
600  // .cfi directives
601  bool parseDirectiveCFIRegister(SMLoc DirectiveLoc);
602  bool parseDirectiveCFIWindowSave();
603  bool parseDirectiveCFISections();
604  bool parseDirectiveCFIStartProc();
605  bool parseDirectiveCFIEndProc();
606  bool parseDirectiveCFIDefCfaOffset();
607  bool parseDirectiveCFIDefCfa(SMLoc DirectiveLoc);
608  bool parseDirectiveCFIAdjustCfaOffset();
609  bool parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc);
610  bool parseDirectiveCFILLVMDefAspaceCfa(SMLoc DirectiveLoc);
611  bool parseDirectiveCFIOffset(SMLoc DirectiveLoc);
612  bool parseDirectiveCFIRelOffset(SMLoc DirectiveLoc);
613  bool parseDirectiveCFIPersonalityOrLsda(bool IsPersonality);
614  bool parseDirectiveCFIRememberState();
615  bool parseDirectiveCFIRestoreState();
616  bool parseDirectiveCFISameValue(SMLoc DirectiveLoc);
617  bool parseDirectiveCFIRestore(SMLoc DirectiveLoc);
618  bool parseDirectiveCFIEscape();
619  bool parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc);
620  bool parseDirectiveCFISignalFrame();
621  bool parseDirectiveCFIUndefined(SMLoc DirectiveLoc);
622 
623  // macro directives
624  bool parseDirectivePurgeMacro(SMLoc DirectiveLoc);
625  bool parseDirectiveExitMacro(StringRef Directive);
626  bool parseDirectiveEndMacro(StringRef Directive);
627  bool parseDirectiveMacro(SMLoc DirectiveLoc);
628  bool parseDirectiveMacrosOnOff(StringRef Directive);
629  // alternate macro mode directives
630  bool parseDirectiveAltmacro(StringRef Directive);
631  // ".bundle_align_mode"
632  bool parseDirectiveBundleAlignMode();
633  // ".bundle_lock"
634  bool parseDirectiveBundleLock();
635  // ".bundle_unlock"
636  bool parseDirectiveBundleUnlock();
637 
638  // ".space", ".skip"
639  bool parseDirectiveSpace(StringRef IDVal);
640 
641  // ".dcb"
642  bool parseDirectiveDCB(StringRef IDVal, unsigned Size);
643  bool parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &);
644  // ".ds"
645  bool parseDirectiveDS(StringRef IDVal, unsigned Size);
646 
647  // .sleb128 (Signed=true) and .uleb128 (Signed=false)
648  bool parseDirectiveLEB128(bool Signed);
649 
650  /// Parse a directive like ".globl" which
651  /// accepts a single symbol (which should be a label or an external).
652  bool parseDirectiveSymbolAttribute(MCSymbolAttr Attr);
653 
654  bool parseDirectiveComm(bool IsLocal); // ".comm" and ".lcomm"
655 
656  bool parseDirectiveAbort(); // ".abort"
657  bool parseDirectiveInclude(); // ".include"
658  bool parseDirectiveIncbin(); // ".incbin"
659 
660  // ".if", ".ifeq", ".ifge", ".ifgt" , ".ifle", ".iflt" or ".ifne"
661  bool parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind);
662  // ".ifb" or ".ifnb", depending on ExpectBlank.
663  bool parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank);
664  // ".ifc" or ".ifnc", depending on ExpectEqual.
665  bool parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual);
666  // ".ifeqs" or ".ifnes", depending on ExpectEqual.
667  bool parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual);
668  // ".ifdef" or ".ifndef", depending on expect_defined
669  bool parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined);
670  bool parseDirectiveElseIf(SMLoc DirectiveLoc); // ".elseif"
671  bool parseDirectiveElse(SMLoc DirectiveLoc); // ".else"
672  bool parseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
673  bool parseEscapedString(std::string &Data) override;
674  bool parseAngleBracketString(std::string &Data) override;
675 
676  const MCExpr *applyModifierToExpr(const MCExpr *E,
678 
679  // Macro-like directives
680  MCAsmMacro *parseMacroLikeBody(SMLoc DirectiveLoc);
681  void instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
682  raw_svector_ostream &OS);
683  bool parseDirectiveRept(SMLoc DirectiveLoc, StringRef Directive);
684  bool parseDirectiveIrp(SMLoc DirectiveLoc); // ".irp"
685  bool parseDirectiveIrpc(SMLoc DirectiveLoc); // ".irpc"
686  bool parseDirectiveEndr(SMLoc DirectiveLoc); // ".endr"
687 
688  // "_emit" or "__emit"
689  bool parseDirectiveMSEmit(SMLoc DirectiveLoc, ParseStatementInfo &Info,
690  size_t Len);
691 
692  // "align"
693  bool parseDirectiveMSAlign(SMLoc DirectiveLoc, ParseStatementInfo &Info);
694 
695  // "end"
696  bool parseDirectiveEnd(SMLoc DirectiveLoc);
697 
698  // ".err" or ".error"
699  bool parseDirectiveError(SMLoc DirectiveLoc, bool WithMessage);
700 
701  // ".warning"
702  bool parseDirectiveWarning(SMLoc DirectiveLoc);
703 
704  // .print <double-quotes-string>
705  bool parseDirectivePrint(SMLoc DirectiveLoc);
706 
707  // .pseudoprobe
708  bool parseDirectivePseudoProbe();
709 
710  // ".lto_discard"
711  bool parseDirectiveLTODiscard();
712 
713  // Directives to support address-significance tables.
714  bool parseDirectiveAddrsig();
715  bool parseDirectiveAddrsigSym();
716 
717  void initializeDirectiveKindMap();
718  void initializeCVDefRangeTypeMap();
719 };
720 
721 class HLASMAsmParser final : public AsmParser {
722 private:
723  MCAsmLexer &Lexer;
724  MCStreamer &Out;
725 
726  void lexLeadingSpaces() {
727  while (Lexer.is(AsmToken::Space))
728  Lexer.Lex();
729  }
730 
731  bool parseAsHLASMLabel(ParseStatementInfo &Info, MCAsmParserSemaCallback *SI);
732  bool parseAsMachineInstruction(ParseStatementInfo &Info,
734 
735 public:
736  HLASMAsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
737  const MCAsmInfo &MAI, unsigned CB = 0)
738  : AsmParser(SM, Ctx, Out, MAI, CB), Lexer(getLexer()), Out(Out) {
739  Lexer.setSkipSpace(false);
740  Lexer.setAllowHashInIdentifier(true);
741  Lexer.setLexHLASMIntegers(true);
742  Lexer.setLexHLASMStrings(true);
743  }
744 
745  ~HLASMAsmParser() { Lexer.setSkipSpace(true); }
746 
747  bool parseStatement(ParseStatementInfo &Info,
748  MCAsmParserSemaCallback *SI) override;
749 };
750 
751 } // end anonymous namespace
752 
753 namespace llvm {
754 
761 
762 } // end namespace llvm
763 
764 enum { DEFAULT_ADDRSPACE = 0 };
765 
766 AsmParser::AsmParser(SourceMgr &SM, MCContext &Ctx, MCStreamer &Out,
767  const MCAsmInfo &MAI, unsigned CB = 0)
768  : Lexer(MAI), Ctx(Ctx), Out(Out), MAI(MAI), SrcMgr(SM),
769  CurBuffer(CB ? CB : SM.getMainFileID()), MacrosEnabledFlag(true) {
770  HadError = false;
771  // Save the old handler.
772  SavedDiagHandler = SrcMgr.getDiagHandler();
773  SavedDiagContext = SrcMgr.getDiagContext();
774  // Set our own handler which calls the saved handler.
776  Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
777  // Make MCStreamer aware of the StartTokLoc for locations in diagnostics.
778  Out.setStartTokLocPtr(&StartTokLoc);
779 
780  // Initialize the platform / file format parser.
781  switch (Ctx.getObjectFileType()) {
782  case MCContext::IsCOFF:
783  PlatformParser.reset(createCOFFAsmParser());
784  break;
785  case MCContext::IsMachO:
786  PlatformParser.reset(createDarwinAsmParser());
787  IsDarwin = true;
788  break;
789  case MCContext::IsELF:
790  PlatformParser.reset(createELFAsmParser());
791  break;
792  case MCContext::IsGOFF:
793  PlatformParser.reset(createGOFFAsmParser());
794  break;
795  case MCContext::IsSPIRV:
797  "Need to implement createSPIRVAsmParser for SPIRV format.");
798  break;
799  case MCContext::IsWasm:
800  PlatformParser.reset(createWasmAsmParser());
801  break;
802  case MCContext::IsXCOFF:
803  PlatformParser.reset(createXCOFFAsmParser());
804  break;
805  case MCContext::IsDXContainer:
806  llvm_unreachable("DXContainer is not supported yet");
807  break;
808  }
809 
810  PlatformParser->Initialize(*this);
811  initializeDirectiveKindMap();
812  initializeCVDefRangeTypeMap();
813 
814  NumOfMacroInstantiations = 0;
815 }
816 
817 AsmParser::~AsmParser() {
818  assert((HadError || ActiveMacros.empty()) &&
819  "Unexpected active macro instantiation!");
820 
821  // Remove MCStreamer's reference to the parser SMLoc.
822  Out.setStartTokLocPtr(nullptr);
823  // Restore the saved diagnostics handler and context for use during
824  // finalization.
825  SrcMgr.setDiagHandler(SavedDiagHandler, SavedDiagContext);
826 }
827 
828 void AsmParser::printMacroInstantiations() {
829  // Print the active macro instantiation stack.
830  for (std::vector<MacroInstantiation *>::const_reverse_iterator
831  it = ActiveMacros.rbegin(),
832  ie = ActiveMacros.rend();
833  it != ie; ++it)
834  printMessage((*it)->InstantiationLoc, SourceMgr::DK_Note,
835  "while in macro instantiation");
836 }
837 
838 void AsmParser::Note(SMLoc L, const Twine &Msg, SMRange Range) {
839  printPendingErrors();
840  printMessage(L, SourceMgr::DK_Note, Msg, Range);
841  printMacroInstantiations();
842 }
843 
844 bool AsmParser::Warning(SMLoc L, const Twine &Msg, SMRange Range) {
845  if(getTargetParser().getTargetOptions().MCNoWarn)
846  return false;
847  if (getTargetParser().getTargetOptions().MCFatalWarnings)
848  return Error(L, Msg, Range);
849  printMessage(L, SourceMgr::DK_Warning, Msg, Range);
850  printMacroInstantiations();
851  return false;
852 }
853 
854 bool AsmParser::printError(SMLoc L, const Twine &Msg, SMRange Range) {
855  HadError = true;
856  printMessage(L, SourceMgr::DK_Error, Msg, Range);
857  printMacroInstantiations();
858  return true;
859 }
860 
861 bool AsmParser::enterIncludeFile(const std::string &Filename) {
862  std::string IncludedFile;
863  unsigned NewBuf =
864  SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
865  if (!NewBuf)
866  return true;
867 
868  CurBuffer = NewBuf;
869  Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
870  return false;
871 }
872 
873 /// Process the specified .incbin file by searching for it in the include paths
874 /// then just emitting the byte contents of the file to the streamer. This
875 /// returns true on failure.
876 bool AsmParser::processIncbinFile(const std::string &Filename, int64_t Skip,
877  const MCExpr *Count, SMLoc Loc) {
878  std::string IncludedFile;
879  unsigned NewBuf =
880  SrcMgr.AddIncludeFile(Filename, Lexer.getLoc(), IncludedFile);
881  if (!NewBuf)
882  return true;
883 
884  // Pick up the bytes from the file and emit them.
885  StringRef Bytes = SrcMgr.getMemoryBuffer(NewBuf)->getBuffer();
886  Bytes = Bytes.drop_front(Skip);
887  if (Count) {
888  int64_t Res;
889  if (!Count->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr()))
890  return Error(Loc, "expected absolute expression");
891  if (Res < 0)
892  return Warning(Loc, "negative count has no effect");
893  Bytes = Bytes.take_front(Res);
894  }
895  getStreamer().emitBytes(Bytes);
896  return false;
897 }
898 
899 void AsmParser::jumpToLoc(SMLoc Loc, unsigned InBuffer) {
900  CurBuffer = InBuffer ? InBuffer : SrcMgr.FindBufferContainingLoc(Loc);
901  Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer(),
902  Loc.getPointer());
903 }
904 
905 const AsmToken &AsmParser::Lex() {
906  if (Lexer.getTok().is(AsmToken::Error))
907  Error(Lexer.getErrLoc(), Lexer.getErr());
908 
909  // if it's a end of statement with a comment in it
910  if (getTok().is(AsmToken::EndOfStatement)) {
911  // if this is a line comment output it.
912  if (!getTok().getString().empty() && getTok().getString().front() != '\n' &&
913  getTok().getString().front() != '\r' && MAI.preserveAsmComments())
914  Out.addExplicitComment(Twine(getTok().getString()));
915  }
916 
917  const AsmToken *tok = &Lexer.Lex();
918 
919  // Parse comments here to be deferred until end of next statement.
920  while (tok->is(AsmToken::Comment)) {
921  if (MAI.preserveAsmComments())
922  Out.addExplicitComment(Twine(tok->getString()));
923  tok = &Lexer.Lex();
924  }
925 
926  if (tok->is(AsmToken::Eof)) {
927  // If this is the end of an included file, pop the parent file off the
928  // include stack.
929  SMLoc ParentIncludeLoc = SrcMgr.getParentIncludeLoc(CurBuffer);
930  if (ParentIncludeLoc != SMLoc()) {
931  jumpToLoc(ParentIncludeLoc);
932  return Lex();
933  }
934  }
935 
936  return *tok;
937 }
938 
939 bool AsmParser::enabledGenDwarfForAssembly() {
940  // Check whether the user specified -g.
941  if (!getContext().getGenDwarfForAssembly())
942  return false;
943  // If we haven't encountered any .file directives (which would imply that
944  // the assembler source was produced with debug info already) then emit one
945  // describing the assembler source file itself.
946  if (getContext().getGenDwarfFileNumber() == 0) {
947  // Use the first #line directive for this, if any. It's preprocessed, so
948  // there is no checksum, and of course no source directive.
949  if (!FirstCppHashFilename.empty())
950  getContext().setMCLineTableRootFile(/*CUID=*/0,
951  getContext().getCompilationDir(),
952  FirstCppHashFilename,
953  /*Cksum=*/None, /*Source=*/None);
954  const MCDwarfFile &RootFile =
955  getContext().getMCDwarfLineTable(/*CUID=*/0).getRootFile();
956  getContext().setGenDwarfFileNumber(getStreamer().emitDwarfFileDirective(
957  /*CUID=*/0, getContext().getCompilationDir(), RootFile.Name,
958  RootFile.Checksum, RootFile.Source));
959  }
960  return true;
961 }
962 
963 bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
964  LTODiscardSymbols.clear();
965 
966  // Create the initial section, if requested.
967  if (!NoInitialTextSection)
968  Out.initSections(false, getTargetParser().getSTI());
969 
970  // Prime the lexer.
971  Lex();
972 
973  HadError = false;
974  AsmCond StartingCondState = TheCondState;
975  SmallVector<AsmRewrite, 4> AsmStrRewrites;
976 
977  // If we are generating dwarf for assembly source files save the initial text
978  // section. (Don't use enabledGenDwarfForAssembly() here, as we aren't
979  // emitting any actual debug info yet and haven't had a chance to parse any
980  // embedded .file directives.)
981  if (getContext().getGenDwarfForAssembly()) {
982  MCSection *Sec = getStreamer().getCurrentSectionOnly();
983  if (!Sec->getBeginSymbol()) {
984  MCSymbol *SectionStartSym = getContext().createTempSymbol();
985  getStreamer().emitLabel(SectionStartSym);
986  Sec->setBeginSymbol(SectionStartSym);
987  }
988  bool InsertResult = getContext().addGenDwarfSection(Sec);
989  assert(InsertResult && ".text section should not have debug info yet");
990  (void)InsertResult;
991  }
992 
993  getTargetParser().onBeginOfFile();
994 
995  // While we have input, parse each statement.
996  while (Lexer.isNot(AsmToken::Eof)) {
997  ParseStatementInfo Info(&AsmStrRewrites);
998  bool Parsed = parseStatement(Info, nullptr);
999 
1000  // If we have a Lexer Error we are on an Error Token. Load in Lexer Error
1001  // for printing ErrMsg via Lex() only if no (presumably better) parser error
1002  // exists.
1003  if (Parsed && !hasPendingError() && Lexer.getTok().is(AsmToken::Error)) {
1004  Lex();
1005  }
1006 
1007  // parseStatement returned true so may need to emit an error.
1008  printPendingErrors();
1009 
1010  // Skipping to the next line if needed.
1011  if (Parsed && !getLexer().isAtStartOfStatement())
1012  eatToEndOfStatement();
1013  }
1014 
1015  getTargetParser().onEndOfFile();
1016  printPendingErrors();
1017 
1018  // All errors should have been emitted.
1019  assert(!hasPendingError() && "unexpected error from parseStatement");
1020 
1021  getTargetParser().flushPendingInstructions(getStreamer());
1022 
1023  if (TheCondState.TheCond != StartingCondState.TheCond ||
1024  TheCondState.Ignore != StartingCondState.Ignore)
1025  printError(getTok().getLoc(), "unmatched .ifs or .elses");
1026  // Check to see there are no empty DwarfFile slots.
1027  const auto &LineTables = getContext().getMCDwarfLineTables();
1028  if (!LineTables.empty()) {
1029  unsigned Index = 0;
1030  for (const auto &File : LineTables.begin()->second.getMCDwarfFiles()) {
1031  if (File.Name.empty() && Index != 0)
1032  printError(getTok().getLoc(), "unassigned file number: " +
1033  Twine(Index) +
1034  " for .file directives");
1035  ++Index;
1036  }
1037  }
1038 
1039  // Check to see that all assembler local symbols were actually defined.
1040  // Targets that don't do subsections via symbols may not want this, though,
1041  // so conservatively exclude them. Only do this if we're finalizing, though,
1042  // as otherwise we won't necessarilly have seen everything yet.
1043  if (!NoFinalize) {
1044  if (MAI.hasSubsectionsViaSymbols()) {
1045  for (const auto &TableEntry : getContext().getSymbols()) {
1046  MCSymbol *Sym = TableEntry.getValue();
1047  // Variable symbols may not be marked as defined, so check those
1048  // explicitly. If we know it's a variable, we have a definition for
1049  // the purposes of this check.
1050  if (Sym->isTemporary() && !Sym->isVariable() && !Sym->isDefined())
1051  // FIXME: We would really like to refer back to where the symbol was
1052  // first referenced for a source location. We need to add something
1053  // to track that. Currently, we just point to the end of the file.
1054  printError(getTok().getLoc(), "assembler local symbol '" +
1055  Sym->getName() + "' not defined");
1056  }
1057  }
1058 
1059  // Temporary symbols like the ones for directional jumps don't go in the
1060  // symbol table. They also need to be diagnosed in all (final) cases.
1061  for (std::tuple<SMLoc, CppHashInfoTy, MCSymbol *> &LocSym : DirLabels) {
1062  if (std::get<2>(LocSym)->isUndefined()) {
1063  // Reset the state of any "# line file" directives we've seen to the
1064  // context as it was at the diagnostic site.
1065  CppHashInfo = std::get<1>(LocSym);
1066  printError(std::get<0>(LocSym), "directional label undefined");
1067  }
1068  }
1069  }
1070  // Finalize the output stream if there are no errors and if the client wants
1071  // us to.
1072  if (!HadError && !NoFinalize) {
1073  if (auto *TS = Out.getTargetStreamer())
1074  TS->emitConstantPools();
1075 
1076  Out.Finish(Lexer.getLoc());
1077  }
1078 
1079  return HadError || getContext().hadError();
1080 }
1081 
1082 bool AsmParser::checkForValidSection() {
1083  if (!ParsingMSInlineAsm && !getStreamer().getCurrentSectionOnly()) {
1084  Out.initSections(false, getTargetParser().getSTI());
1085  return Error(getTok().getLoc(),
1086  "expected section directive before assembly directive");
1087  }
1088  return false;
1089 }
1090 
1091 /// Throw away the rest of the line for testing purposes.
1092 void AsmParser::eatToEndOfStatement() {
1093  while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
1094  Lexer.Lex();
1095 
1096  // Eat EOL.
1097  if (Lexer.is(AsmToken::EndOfStatement))
1098  Lexer.Lex();
1099 }
1100 
1101 StringRef AsmParser::parseStringToEndOfStatement() {
1102  const char *Start = getTok().getLoc().getPointer();
1103 
1104  while (Lexer.isNot(AsmToken::EndOfStatement) && Lexer.isNot(AsmToken::Eof))
1105  Lexer.Lex();
1106 
1107  const char *End = getTok().getLoc().getPointer();
1108  return StringRef(Start, End - Start);
1109 }
1110 
1111 StringRef AsmParser::parseStringToComma() {
1112  const char *Start = getTok().getLoc().getPointer();
1113 
1114  while (Lexer.isNot(AsmToken::EndOfStatement) &&
1115  Lexer.isNot(AsmToken::Comma) && Lexer.isNot(AsmToken::Eof))
1116  Lexer.Lex();
1117 
1118  const char *End = getTok().getLoc().getPointer();
1119  return StringRef(Start, End - Start);
1120 }
1121 
1122 /// Parse a paren expression and return it.
1123 /// NOTE: This assumes the leading '(' has already been consumed.
1124 ///
1125 /// parenexpr ::= expr)
1126 ///
1127 bool AsmParser::parseParenExpr(const MCExpr *&Res, SMLoc &EndLoc) {
1128  if (parseExpression(Res))
1129  return true;
1130  EndLoc = Lexer.getTok().getEndLoc();
1131  return parseRParen();
1132 }
1133 
1134 /// Parse a bracket expression and return it.
1135 /// NOTE: This assumes the leading '[' has already been consumed.
1136 ///
1137 /// bracketexpr ::= expr]
1138 ///
1139 bool AsmParser::parseBracketExpr(const MCExpr *&Res, SMLoc &EndLoc) {
1140  if (parseExpression(Res))
1141  return true;
1142  EndLoc = getTok().getEndLoc();
1143  if (parseToken(AsmToken::RBrac, "expected ']' in brackets expression"))
1144  return true;
1145  return false;
1146 }
1147 
1148 /// Parse a primary expression and return it.
1149 /// primaryexpr ::= (parenexpr
1150 /// primaryexpr ::= symbol
1151 /// primaryexpr ::= number
1152 /// primaryexpr ::= '.'
1153 /// primaryexpr ::= ~,+,- primaryexpr
1154 bool AsmParser::parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc,
1155  AsmTypeInfo *TypeInfo) {
1156  SMLoc FirstTokenLoc = getLexer().getLoc();
1157  AsmToken::TokenKind FirstTokenKind = Lexer.getKind();
1158  switch (FirstTokenKind) {
1159  default:
1160  return TokError("unknown token in expression");
1161  // If we have an error assume that we've already handled it.
1162  case AsmToken::Error:
1163  return true;
1164  case AsmToken::Exclaim:
1165  Lex(); // Eat the operator.
1166  if (parsePrimaryExpr(Res, EndLoc, TypeInfo))
1167  return true;
1168  Res = MCUnaryExpr::createLNot(Res, getContext(), FirstTokenLoc);
1169  return false;
1170  case AsmToken::Dollar:
1171  case AsmToken::Star:
1172  case AsmToken::At:
1173  case AsmToken::String:
1174  case AsmToken::Identifier: {
1176  if (parseIdentifier(Identifier)) {
1177  // We may have failed but '$'|'*' may be a valid token in context of
1178  // the current PC.
1179  if (getTok().is(AsmToken::Dollar) || getTok().is(AsmToken::Star)) {
1180  bool ShouldGenerateTempSymbol = false;
1181  if ((getTok().is(AsmToken::Dollar) && MAI.getDollarIsPC()) ||
1182  (getTok().is(AsmToken::Star) && MAI.getStarIsPC()))
1183  ShouldGenerateTempSymbol = true;
1184 
1185  if (!ShouldGenerateTempSymbol)
1186  return Error(FirstTokenLoc, "invalid token in expression");
1187 
1188  // Eat the '$'|'*' token.
1189  Lex();
1190  // This is either a '$'|'*' reference, which references the current PC.
1191  // Emit a temporary label to the streamer and refer to it.
1192  MCSymbol *Sym = Ctx.createTempSymbol();
1193  Out.emitLabel(Sym);
1194  Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None,
1195  getContext());
1196  EndLoc = FirstTokenLoc;
1197  return false;
1198  }
1199  }
1200  // Parse symbol variant
1201  std::pair<StringRef, StringRef> Split;
1202  if (!MAI.useParensForSymbolVariant()) {
1203  if (FirstTokenKind == AsmToken::String) {
1204  if (Lexer.is(AsmToken::At)) {
1205  Lex(); // eat @
1206  SMLoc AtLoc = getLexer().getLoc();
1207  StringRef VName;
1208  if (parseIdentifier(VName))
1209  return Error(AtLoc, "expected symbol variant after '@'");
1210 
1211  Split = std::make_pair(Identifier, VName);
1212  }
1213  } else {
1214  Split = Identifier.split('@');
1215  }
1216  } else if (Lexer.is(AsmToken::LParen)) {
1217  Lex(); // eat '('.
1218  StringRef VName;
1219  parseIdentifier(VName);
1220  if (parseRParen())
1221  return true;
1222  Split = std::make_pair(Identifier, VName);
1223  }
1224 
1225  EndLoc = SMLoc::getFromPointer(Identifier.end());
1226 
1227  // This is a symbol reference.
1229  if (SymbolName.empty())
1230  return Error(getLexer().getLoc(), "expected a symbol reference");
1231 
1232  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
1233 
1234  // Lookup the symbol variant if used.
1235  if (!Split.second.empty()) {
1236  Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
1237  if (Variant != MCSymbolRefExpr::VK_Invalid) {
1238  SymbolName = Split.first;
1239  } else if (MAI.doesAllowAtInName() && !MAI.useParensForSymbolVariant()) {
1240  Variant = MCSymbolRefExpr::VK_None;
1241  } else {
1242  return Error(SMLoc::getFromPointer(Split.second.begin()),
1243  "invalid variant '" + Split.second + "'");
1244  }
1245  }
1246 
1247  MCSymbol *Sym = getContext().getInlineAsmLabel(SymbolName);
1248  if (!Sym)
1249  Sym = getContext().getOrCreateSymbol(
1251 
1252  // If this is an absolute variable reference, substitute it now to preserve
1253  // semantics in the face of reassignment.
1254  if (Sym->isVariable()) {
1255  auto V = Sym->getVariableValue(/*SetUsed*/ false);
1256  bool DoInline = isa<MCConstantExpr>(V) && !Variant;
1257  if (auto TV = dyn_cast<MCTargetExpr>(V))
1258  DoInline = TV->inlineAssignedExpr();
1259  if (DoInline) {
1260  if (Variant)
1261  return Error(EndLoc, "unexpected modifier on variable reference");
1262  Res = Sym->getVariableValue(/*SetUsed*/ false);
1263  return false;
1264  }
1265  }
1266 
1267  // Otherwise create a symbol ref.
1268  Res = MCSymbolRefExpr::create(Sym, Variant, getContext(), FirstTokenLoc);
1269  return false;
1270  }
1271  case AsmToken::BigNum:
1272  return TokError("literal value out of range for directive");
1273  case AsmToken::Integer: {
1274  SMLoc Loc = getTok().getLoc();
1275  int64_t IntVal = getTok().getIntVal();
1276  Res = MCConstantExpr::create(IntVal, getContext());
1277  EndLoc = Lexer.getTok().getEndLoc();
1278  Lex(); // Eat token.
1279  // Look for 'b' or 'f' following an Integer as a directional label
1280  if (Lexer.getKind() == AsmToken::Identifier) {
1281  StringRef IDVal = getTok().getString();
1282  // Lookup the symbol variant if used.
1283  std::pair<StringRef, StringRef> Split = IDVal.split('@');
1284  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
1285  if (Split.first.size() != IDVal.size()) {
1286  Variant = MCSymbolRefExpr::getVariantKindForName(Split.second);
1287  if (Variant == MCSymbolRefExpr::VK_Invalid)
1288  return TokError("invalid variant '" + Split.second + "'");
1289  IDVal = Split.first;
1290  }
1291  if (IDVal == "f" || IDVal == "b") {
1292  MCSymbol *Sym =
1293  Ctx.getDirectionalLocalSymbol(IntVal, IDVal == "b");
1294  Res = MCSymbolRefExpr::create(Sym, Variant, getContext());
1295  if (IDVal == "b" && Sym->isUndefined())
1296  return Error(Loc, "directional label undefined");
1297  DirLabels.push_back(std::make_tuple(Loc, CppHashInfo, Sym));
1298  EndLoc = Lexer.getTok().getEndLoc();
1299  Lex(); // Eat identifier.
1300  }
1301  }
1302  return false;
1303  }
1304  case AsmToken::Real: {
1305  APFloat RealVal(APFloat::IEEEdouble(), getTok().getString());
1306  uint64_t IntVal = RealVal.bitcastToAPInt().getZExtValue();
1307  Res = MCConstantExpr::create(IntVal, getContext());
1308  EndLoc = Lexer.getTok().getEndLoc();
1309  Lex(); // Eat token.
1310  return false;
1311  }
1312  case AsmToken::Dot: {
1313  if (!MAI.getDotIsPC())
1314  return TokError("cannot use . as current PC");
1315 
1316  // This is a '.' reference, which references the current PC. Emit a
1317  // temporary label to the streamer and refer to it.
1318  MCSymbol *Sym = Ctx.createTempSymbol();
1319  Out.emitLabel(Sym);
1320  Res = MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
1321  EndLoc = Lexer.getTok().getEndLoc();
1322  Lex(); // Eat identifier.
1323  return false;
1324  }
1325  case AsmToken::LParen:
1326  Lex(); // Eat the '('.
1327  return parseParenExpr(Res, EndLoc);
1328  case AsmToken::LBrac:
1329  if (!PlatformParser->HasBracketExpressions())
1330  return TokError("brackets expression not supported on this target");
1331  Lex(); // Eat the '['.
1332  return parseBracketExpr(Res, EndLoc);
1333  case AsmToken::Minus:
1334  Lex(); // Eat the operator.
1335  if (parsePrimaryExpr(Res, EndLoc, TypeInfo))
1336  return true;
1337  Res = MCUnaryExpr::createMinus(Res, getContext(), FirstTokenLoc);
1338  return false;
1339  case AsmToken::Plus:
1340  Lex(); // Eat the operator.
1341  if (parsePrimaryExpr(Res, EndLoc, TypeInfo))
1342  return true;
1343  Res = MCUnaryExpr::createPlus(Res, getContext(), FirstTokenLoc);
1344  return false;
1345  case AsmToken::Tilde:
1346  Lex(); // Eat the operator.
1347  if (parsePrimaryExpr(Res, EndLoc, TypeInfo))
1348  return true;
1349  Res = MCUnaryExpr::createNot(Res, getContext(), FirstTokenLoc);
1350  return false;
1351  // MIPS unary expression operators. The lexer won't generate these tokens if
1352  // MCAsmInfo::HasMipsExpressions is false for the target.
1353  case AsmToken::PercentCall16:
1354  case AsmToken::PercentCall_Hi:
1355  case AsmToken::PercentCall_Lo:
1356  case AsmToken::PercentDtprel_Hi:
1357  case AsmToken::PercentDtprel_Lo:
1358  case AsmToken::PercentGot:
1359  case AsmToken::PercentGot_Disp:
1360  case AsmToken::PercentGot_Hi:
1361  case AsmToken::PercentGot_Lo:
1362  case AsmToken::PercentGot_Ofst:
1363  case AsmToken::PercentGot_Page:
1364  case AsmToken::PercentGottprel:
1365  case AsmToken::PercentGp_Rel:
1366  case AsmToken::PercentHi:
1367  case AsmToken::PercentHigher:
1368  case AsmToken::PercentHighest:
1369  case AsmToken::PercentLo:
1370  case AsmToken::PercentNeg:
1371  case AsmToken::PercentPcrel_Hi:
1372  case AsmToken::PercentPcrel_Lo:
1373  case AsmToken::PercentTlsgd:
1374  case AsmToken::PercentTlsldm:
1375  case AsmToken::PercentTprel_Hi:
1376  case AsmToken::PercentTprel_Lo:
1377  Lex(); // Eat the operator.
1378  if (Lexer.isNot(AsmToken::LParen))
1379  return TokError("expected '(' after operator");
1380  Lex(); // Eat the operator.
1381  if (parseExpression(Res, EndLoc))
1382  return true;
1383  if (parseRParen())
1384  return true;
1385  Res = getTargetParser().createTargetUnaryExpr(Res, FirstTokenKind, Ctx);
1386  return !Res;
1387  }
1388 }
1389 
1390 bool AsmParser::parseExpression(const MCExpr *&Res) {
1391  SMLoc EndLoc;
1392  return parseExpression(Res, EndLoc);
1393 }
1394 
1395 const MCExpr *
1396 AsmParser::applyModifierToExpr(const MCExpr *E,
1397  MCSymbolRefExpr::VariantKind Variant) {
1398  // Ask the target implementation about this expression first.
1399  const MCExpr *NewE = getTargetParser().applyModifierToExpr(E, Variant, Ctx);
1400  if (NewE)
1401  return NewE;
1402  // Recurse over the given expression, rebuilding it to apply the given variant
1403  // if there is exactly one symbol.
1404  switch (E->getKind()) {
1405  case MCExpr::Target:
1406  case MCExpr::Constant:
1407  return nullptr;
1408 
1409  case MCExpr::SymbolRef: {
1410  const MCSymbolRefExpr *SRE = cast<MCSymbolRefExpr>(E);
1411 
1412  if (SRE->getKind() != MCSymbolRefExpr::VK_None) {
1413  TokError("invalid variant on expression '" + getTok().getIdentifier() +
1414  "' (already modified)");
1415  return E;
1416  }
1417 
1418  return MCSymbolRefExpr::create(&SRE->getSymbol(), Variant, getContext());
1419  }
1420 
1421  case MCExpr::Unary: {
1422  const MCUnaryExpr *UE = cast<MCUnaryExpr>(E);
1423  const MCExpr *Sub = applyModifierToExpr(UE->getSubExpr(), Variant);
1424  if (!Sub)
1425  return nullptr;
1426  return MCUnaryExpr::create(UE->getOpcode(), Sub, getContext());
1427  }
1428 
1429  case MCExpr::Binary: {
1430  const MCBinaryExpr *BE = cast<MCBinaryExpr>(E);
1431  const MCExpr *LHS = applyModifierToExpr(BE->getLHS(), Variant);
1432  const MCExpr *RHS = applyModifierToExpr(BE->getRHS(), Variant);
1433 
1434  if (!LHS && !RHS)
1435  return nullptr;
1436 
1437  if (!LHS)
1438  LHS = BE->getLHS();
1439  if (!RHS)
1440  RHS = BE->getRHS();
1441 
1442  return MCBinaryExpr::create(BE->getOpcode(), LHS, RHS, getContext());
1443  }
1444  }
1445 
1446  llvm_unreachable("Invalid expression kind!");
1447 }
1448 
1449 /// This function checks if the next token is <string> type or arithmetic.
1450 /// string that begin with character '<' must end with character '>'.
1451 /// otherwise it is arithmetics.
1452 /// If the function returns a 'true' value,
1453 /// the End argument will be filled with the last location pointed to the '>'
1454 /// character.
1455 
1456 /// There is a gap between the AltMacro's documentation and the single quote
1457 /// implementation. GCC does not fully support this feature and so we will not
1458 /// support it.
1459 /// TODO: Adding single quote as a string.
1460 static bool isAngleBracketString(SMLoc &StrLoc, SMLoc &EndLoc) {
1461  assert((StrLoc.getPointer() != nullptr) &&
1462  "Argument to the function cannot be a NULL value");
1463  const char *CharPtr = StrLoc.getPointer();
1464  while ((*CharPtr != '>') && (*CharPtr != '\n') && (*CharPtr != '\r') &&
1465  (*CharPtr != '\0')) {
1466  if (*CharPtr == '!')
1467  CharPtr++;
1468  CharPtr++;
1469  }
1470  if (*CharPtr == '>') {
1471  EndLoc = StrLoc.getFromPointer(CharPtr + 1);
1472  return true;
1473  }
1474  return false;
1475 }
1476 
1477 /// creating a string without the escape characters '!'.
1478 static std::string angleBracketString(StringRef AltMacroStr) {
1479  std::string Res;
1480  for (size_t Pos = 0; Pos < AltMacroStr.size(); Pos++) {
1481  if (AltMacroStr[Pos] == '!')
1482  Pos++;
1483  Res += AltMacroStr[Pos];
1484  }
1485  return Res;
1486 }
1487 
1488 /// Parse an expression and return it.
1489 ///
1490 /// expr ::= expr &&,|| expr -> lowest.
1491 /// expr ::= expr |,^,&,! expr
1492 /// expr ::= expr ==,!=,<>,<,<=,>,>= expr
1493 /// expr ::= expr <<,>> expr
1494 /// expr ::= expr +,- expr
1495 /// expr ::= expr *,/,% expr -> highest.
1496 /// expr ::= primaryexpr
1497 ///
1498 bool AsmParser::parseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1499  // Parse the expression.
1500  Res = nullptr;
1501  if (getTargetParser().parsePrimaryExpr(Res, EndLoc) ||
1502  parseBinOpRHS(1, Res, EndLoc))
1503  return true;
1504 
1505  // As a special case, we support 'a op b @ modifier' by rewriting the
1506  // expression to include the modifier. This is inefficient, but in general we
1507  // expect users to use 'a@modifier op b'.
1508  if (Lexer.getKind() == AsmToken::At) {
1509  Lex();
1510 
1511  if (Lexer.isNot(AsmToken::Identifier))
1512  return TokError("unexpected symbol modifier following '@'");
1513 
1515  MCSymbolRefExpr::getVariantKindForName(getTok().getIdentifier());
1516  if (Variant == MCSymbolRefExpr::VK_Invalid)
1517  return TokError("invalid variant '" + getTok().getIdentifier() + "'");
1518 
1519  const MCExpr *ModifiedRes = applyModifierToExpr(Res, Variant);
1520  if (!ModifiedRes) {
1521  return TokError("invalid modifier '" + getTok().getIdentifier() +
1522  "' (no symbols present)");
1523  }
1524 
1525  Res = ModifiedRes;
1526  Lex();
1527  }
1528 
1529  // Try to constant fold it up front, if possible. Do not exploit
1530  // assembler here.
1531  int64_t Value;
1532  if (Res->evaluateAsAbsolute(Value))
1533  Res = MCConstantExpr::create(Value, getContext());
1534 
1535  return false;
1536 }
1537 
1538 bool AsmParser::parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
1539  Res = nullptr;
1540  return parseParenExpr(Res, EndLoc) || parseBinOpRHS(1, Res, EndLoc);
1541 }
1542 
1543 bool AsmParser::parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
1544  SMLoc &EndLoc) {
1545  if (parseParenExpr(Res, EndLoc))
1546  return true;
1547 
1548  for (; ParenDepth > 0; --ParenDepth) {
1549  if (parseBinOpRHS(1, Res, EndLoc))
1550  return true;
1551 
1552  // We don't Lex() the last RParen.
1553  // This is the same behavior as parseParenExpression().
1554  if (ParenDepth - 1 > 0) {
1555  EndLoc = getTok().getEndLoc();
1556  if (parseRParen())
1557  return true;
1558  }
1559  }
1560  return false;
1561 }
1562 
1563 bool AsmParser::parseAbsoluteExpression(int64_t &Res) {
1564  const MCExpr *Expr;
1565 
1566  SMLoc StartLoc = Lexer.getLoc();
1567  if (parseExpression(Expr))
1568  return true;
1569 
1570  if (!Expr->evaluateAsAbsolute(Res, getStreamer().getAssemblerPtr()))
1571  return Error(StartLoc, "expected absolute expression");
1572 
1573  return false;
1574 }
1575 
1578  bool ShouldUseLogicalShr) {
1579  switch (K) {
1580  default:
1581  return 0; // not a binop.
1582 
1583  // Lowest Precedence: &&, ||
1584  case AsmToken::AmpAmp:
1585  Kind = MCBinaryExpr::LAnd;
1586  return 1;
1587  case AsmToken::PipePipe:
1588  Kind = MCBinaryExpr::LOr;
1589  return 1;
1590 
1591  // Low Precedence: |, &, ^
1592  case AsmToken::Pipe:
1593  Kind = MCBinaryExpr::Or;
1594  return 2;
1595  case AsmToken::Caret:
1596  Kind = MCBinaryExpr::Xor;
1597  return 2;
1598  case AsmToken::Amp:
1599  Kind = MCBinaryExpr::And;
1600  return 2;
1601 
1602  // Low Intermediate Precedence: ==, !=, <>, <, <=, >, >=
1603  case AsmToken::EqualEqual:
1605  return 3;
1606  case AsmToken::ExclaimEqual:
1607  case AsmToken::LessGreater:
1609  return 3;
1610  case AsmToken::Less:
1612  return 3;
1613  case AsmToken::LessEqual:
1614  Kind = MCBinaryExpr::LTE;
1615  return 3;
1616  case AsmToken::Greater:
1618  return 3;
1619  case AsmToken::GreaterEqual:
1620  Kind = MCBinaryExpr::GTE;
1621  return 3;
1622 
1623  // Intermediate Precedence: <<, >>
1624  case AsmToken::LessLess:
1625  Kind = MCBinaryExpr::Shl;
1626  return 4;
1627  case AsmToken::GreaterGreater:
1628  Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
1629  return 4;
1630 
1631  // High Intermediate Precedence: +, -
1632  case AsmToken::Plus:
1634  return 5;
1635  case AsmToken::Minus:
1636  Kind = MCBinaryExpr::Sub;
1637  return 5;
1638 
1639  // Highest Precedence: *, /, %
1640  case AsmToken::Star:
1642  return 6;
1643  case AsmToken::Slash:
1644  Kind = MCBinaryExpr::Div;
1645  return 6;
1646  case AsmToken::Percent:
1648  return 6;
1649  }
1650 }
1651 
1652 static unsigned getGNUBinOpPrecedence(const MCAsmInfo &MAI,
1655  bool ShouldUseLogicalShr) {
1656  switch (K) {
1657  default:
1658  return 0; // not a binop.
1659 
1660  // Lowest Precedence: &&, ||
1661  case AsmToken::AmpAmp:
1662  Kind = MCBinaryExpr::LAnd;
1663  return 2;
1664  case AsmToken::PipePipe:
1665  Kind = MCBinaryExpr::LOr;
1666  return 1;
1667 
1668  // Low Precedence: ==, !=, <>, <, <=, >, >=
1669  case AsmToken::EqualEqual:
1671  return 3;
1672  case AsmToken::ExclaimEqual:
1673  case AsmToken::LessGreater:
1675  return 3;
1676  case AsmToken::Less:
1678  return 3;
1679  case AsmToken::LessEqual:
1680  Kind = MCBinaryExpr::LTE;
1681  return 3;
1682  case AsmToken::Greater:
1684  return 3;
1685  case AsmToken::GreaterEqual:
1686  Kind = MCBinaryExpr::GTE;
1687  return 3;
1688 
1689  // Low Intermediate Precedence: +, -
1690  case AsmToken::Plus:
1692  return 4;
1693  case AsmToken::Minus:
1694  Kind = MCBinaryExpr::Sub;
1695  return 4;
1696 
1697  // High Intermediate Precedence: |, !, &, ^
1698  //
1699  case AsmToken::Pipe:
1700  Kind = MCBinaryExpr::Or;
1701  return 5;
1702  case AsmToken::Exclaim:
1703  // Hack to support ARM compatible aliases (implied 'sp' operand in 'srs*'
1704  // instructions like 'srsda #31!') and not parse ! as an infix operator.
1705  if (MAI.getCommentString() == "@")
1706  return 0;
1707  Kind = MCBinaryExpr::OrNot;
1708  return 5;
1709  case AsmToken::Caret:
1710  Kind = MCBinaryExpr::Xor;
1711  return 5;
1712  case AsmToken::Amp:
1713  Kind = MCBinaryExpr::And;
1714  return 5;
1715 
1716  // Highest Precedence: *, /, %, <<, >>
1717  case AsmToken::Star:
1719  return 6;
1720  case AsmToken::Slash:
1721  Kind = MCBinaryExpr::Div;
1722  return 6;
1723  case AsmToken::Percent:
1725  return 6;
1726  case AsmToken::LessLess:
1727  Kind = MCBinaryExpr::Shl;
1728  return 6;
1729  case AsmToken::GreaterGreater:
1730  Kind = ShouldUseLogicalShr ? MCBinaryExpr::LShr : MCBinaryExpr::AShr;
1731  return 6;
1732  }
1733 }
1734 
1735 unsigned AsmParser::getBinOpPrecedence(AsmToken::TokenKind K,
1737  bool ShouldUseLogicalShr = MAI.shouldUseLogicalShr();
1738  return IsDarwin ? getDarwinBinOpPrecedence(K, Kind, ShouldUseLogicalShr)
1739  : getGNUBinOpPrecedence(MAI, K, Kind, ShouldUseLogicalShr);
1740 }
1741 
1742 /// Parse all binary operators with precedence >= 'Precedence'.
1743 /// Res contains the LHS of the expression on input.
1744 bool AsmParser::parseBinOpRHS(unsigned Precedence, const MCExpr *&Res,
1745  SMLoc &EndLoc) {
1746  SMLoc StartLoc = Lexer.getLoc();
1747  while (true) {
1749  unsigned TokPrec = getBinOpPrecedence(Lexer.getKind(), Kind);
1750 
1751  // If the next token is lower precedence than we are allowed to eat, return
1752  // successfully with what we ate already.
1753  if (TokPrec < Precedence)
1754  return false;
1755 
1756  Lex();
1757 
1758  // Eat the next primary expression.
1759  const MCExpr *RHS;
1760  if (getTargetParser().parsePrimaryExpr(RHS, EndLoc))
1761  return true;
1762 
1763  // If BinOp binds less tightly with RHS than the operator after RHS, let
1764  // the pending operator take RHS as its LHS.
1766  unsigned NextTokPrec = getBinOpPrecedence(Lexer.getKind(), Dummy);
1767  if (TokPrec < NextTokPrec && parseBinOpRHS(TokPrec + 1, RHS, EndLoc))
1768  return true;
1769 
1770  // Merge LHS and RHS according to operator.
1771  Res = MCBinaryExpr::create(Kind, Res, RHS, getContext(), StartLoc);
1772  }
1773 }
1774 
1775 /// ParseStatement:
1776 /// ::= EndOfStatement
1777 /// ::= Label* Directive ...Operands... EndOfStatement
1778 /// ::= Label* Identifier OperandList* EndOfStatement
1779 bool AsmParser::parseStatement(ParseStatementInfo &Info,
1781  assert(!hasPendingError() && "parseStatement started with pending error");
1782  // Eat initial spaces and comments
1783  while (Lexer.is(AsmToken::Space))
1784  Lex();
1785  if (Lexer.is(AsmToken::EndOfStatement)) {
1786  // if this is a line comment we can drop it safely
1787  if (getTok().getString().empty() || getTok().getString().front() == '\r' ||
1788  getTok().getString().front() == '\n')
1789  Out.AddBlankLine();
1790  Lex();
1791  return false;
1792  }
1793  // Statements always start with an identifier.
1794  AsmToken ID = getTok();
1795  SMLoc IDLoc = ID.getLoc();
1796  StringRef IDVal;
1797  int64_t LocalLabelVal = -1;
1798  StartTokLoc = ID.getLoc();
1799  if (Lexer.is(AsmToken::HashDirective))
1800  return parseCppHashLineFilenameComment(IDLoc,
1801  !isInsideMacroInstantiation());
1802 
1803  // Allow an integer followed by a ':' as a directional local label.
1804  if (Lexer.is(AsmToken::Integer)) {
1805  LocalLabelVal = getTok().getIntVal();
1806  if (LocalLabelVal < 0) {
1807  if (!TheCondState.Ignore) {
1808  Lex(); // always eat a token
1809  return Error(IDLoc, "unexpected token at start of statement");
1810  }
1811  IDVal = "";
1812  } else {
1813  IDVal = getTok().getString();
1814  Lex(); // Consume the integer token to be used as an identifier token.
1815  if (Lexer.getKind() != AsmToken::Colon) {
1816  if (!TheCondState.Ignore) {
1817  Lex(); // always eat a token
1818  return Error(IDLoc, "unexpected token at start of statement");
1819  }
1820  }
1821  }
1822  } else if (Lexer.is(AsmToken::Dot)) {
1823  // Treat '.' as a valid identifier in this context.
1824  Lex();
1825  IDVal = ".";
1826  } else if (Lexer.is(AsmToken::LCurly)) {
1827  // Treat '{' as a valid identifier in this context.
1828  Lex();
1829  IDVal = "{";
1830 
1831  } else if (Lexer.is(AsmToken::RCurly)) {
1832  // Treat '}' as a valid identifier in this context.
1833  Lex();
1834  IDVal = "}";
1835  } else if (Lexer.is(AsmToken::Star) &&
1836  getTargetParser().starIsStartOfStatement()) {
1837  // Accept '*' as a valid start of statement.
1838  Lex();
1839  IDVal = "*";
1840  } else if (parseIdentifier(IDVal)) {
1841  if (!TheCondState.Ignore) {
1842  Lex(); // always eat a token
1843  return Error(IDLoc, "unexpected token at start of statement");
1844  }
1845  IDVal = "";
1846  }
1847 
1848  // Handle conditional assembly here before checking for skipping. We
1849  // have to do this so that .endif isn't skipped in a ".if 0" block for
1850  // example.
1852  DirectiveKindMap.find(IDVal.lower());
1853  DirectiveKind DirKind = (DirKindIt == DirectiveKindMap.end())
1854  ? DK_NO_DIRECTIVE
1855  : DirKindIt->getValue();
1856  switch (DirKind) {
1857  default:
1858  break;
1859  case DK_IF:
1860  case DK_IFEQ:
1861  case DK_IFGE:
1862  case DK_IFGT:
1863  case DK_IFLE:
1864  case DK_IFLT:
1865  case DK_IFNE:
1866  return parseDirectiveIf(IDLoc, DirKind);
1867  case DK_IFB:
1868  return parseDirectiveIfb(IDLoc, true);
1869  case DK_IFNB:
1870  return parseDirectiveIfb(IDLoc, false);
1871  case DK_IFC:
1872  return parseDirectiveIfc(IDLoc, true);
1873  case DK_IFEQS:
1874  return parseDirectiveIfeqs(IDLoc, true);
1875  case DK_IFNC:
1876  return parseDirectiveIfc(IDLoc, false);
1877  case DK_IFNES:
1878  return parseDirectiveIfeqs(IDLoc, false);
1879  case DK_IFDEF:
1880  return parseDirectiveIfdef(IDLoc, true);
1881  case DK_IFNDEF:
1882  case DK_IFNOTDEF:
1883  return parseDirectiveIfdef(IDLoc, false);
1884  case DK_ELSEIF:
1885  return parseDirectiveElseIf(IDLoc);
1886  case DK_ELSE:
1887  return parseDirectiveElse(IDLoc);
1888  case DK_ENDIF:
1889  return parseDirectiveEndIf(IDLoc);
1890  }
1891 
1892  // Ignore the statement if in the middle of inactive conditional
1893  // (e.g. ".if 0").
1894  if (TheCondState.Ignore) {
1895  eatToEndOfStatement();
1896  return false;
1897  }
1898 
1899  // FIXME: Recurse on local labels?
1900 
1901  // See what kind of statement we have.
1902  switch (Lexer.getKind()) {
1903  case AsmToken::Colon: {
1904  if (!getTargetParser().isLabel(ID))
1905  break;
1906  if (checkForValidSection())
1907  return true;
1908 
1909  // identifier ':' -> Label.
1910  Lex();
1911 
1912  // Diagnose attempt to use '.' as a label.
1913  if (IDVal == ".")
1914  return Error(IDLoc, "invalid use of pseudo-symbol '.' as a label");
1915 
1916  // Diagnose attempt to use a variable as a label.
1917  //
1918  // FIXME: Diagnostics. Note the location of the definition as a label.
1919  // FIXME: This doesn't diagnose assignment to a symbol which has been
1920  // implicitly marked as external.
1921  MCSymbol *Sym;
1922  if (LocalLabelVal == -1) {
1923  if (ParsingMSInlineAsm && SI) {
1924  StringRef RewrittenLabel =
1925  SI->LookupInlineAsmLabel(IDVal, getSourceManager(), IDLoc, true);
1926  assert(!RewrittenLabel.empty() &&
1927  "We should have an internal name here.");
1928  Info.AsmRewrites->emplace_back(AOK_Label, IDLoc, IDVal.size(),
1929  RewrittenLabel);
1930  IDVal = RewrittenLabel;
1931  }
1932  Sym = getContext().getOrCreateSymbol(IDVal);
1933  } else
1934  Sym = Ctx.createDirectionalLocalSymbol(LocalLabelVal);
1935  // End of Labels should be treated as end of line for lexing
1936  // purposes but that information is not available to the Lexer who
1937  // does not understand Labels. This may cause us to see a Hash
1938  // here instead of a preprocessor line comment.
1939  if (getTok().is(AsmToken::Hash)) {
1940  StringRef CommentStr = parseStringToEndOfStatement();
1941  Lexer.Lex();
1942  Lexer.UnLex(AsmToken(AsmToken::EndOfStatement, CommentStr));
1943  }
1944 
1945  // Consume any end of statement token, if present, to avoid spurious
1946  // AddBlankLine calls().
1947  if (getTok().is(AsmToken::EndOfStatement)) {
1948  Lex();
1949  }
1950 
1951  if (discardLTOSymbol(IDVal))
1952  return false;
1953 
1954  getTargetParser().doBeforeLabelEmit(Sym);
1955 
1956  // Emit the label.
1957  if (!getTargetParser().isParsingMSInlineAsm())
1958  Out.emitLabel(Sym, IDLoc);
1959 
1960  // If we are generating dwarf for assembly source files then gather the
1961  // info to make a dwarf label entry for this label if needed.
1962  if (enabledGenDwarfForAssembly())
1963  MCGenDwarfLabelEntry::Make(Sym, &getStreamer(), getSourceManager(),
1964  IDLoc);
1965 
1966  getTargetParser().onLabelParsed(Sym);
1967 
1968  return false;
1969  }
1970 
1971  case AsmToken::Equal:
1972  if (!getTargetParser().equalIsAsmAssignment())
1973  break;
1974  // identifier '=' ... -> assignment statement
1975  Lex();
1976 
1977  return parseAssignment(IDVal, AssignmentKind::Equal);
1978 
1979  default: // Normal instruction or directive.
1980  break;
1981  }
1982 
1983  // If macros are enabled, check to see if this is a macro instantiation.
1984  if (areMacrosEnabled())
1985  if (const MCAsmMacro *M = getContext().lookupMacro(IDVal)) {
1986  return handleMacroEntry(M, IDLoc);
1987  }
1988 
1989  // Otherwise, we have a normal instruction or directive.
1990 
1991  // Directives start with "."
1992  if (IDVal.startswith(".") && IDVal != ".") {
1993  // There are several entities interested in parsing directives:
1994  //
1995  // 1. The target-specific assembly parser. Some directives are target
1996  // specific or may potentially behave differently on certain targets.
1997  // 2. Asm parser extensions. For example, platform-specific parsers
1998  // (like the ELF parser) register themselves as extensions.
1999  // 3. The generic directive parser implemented by this class. These are
2000  // all the directives that behave in a target and platform independent
2001  // manner, or at least have a default behavior that's shared between
2002  // all targets and platforms.
2003 
2004  getTargetParser().flushPendingInstructions(getStreamer());
2005 
2006  SMLoc StartTokLoc = getTok().getLoc();
2007  bool TPDirectiveReturn = getTargetParser().ParseDirective(ID);
2008 
2009  if (hasPendingError())
2010  return true;
2011  // Currently the return value should be true if we are
2012  // uninterested but as this is at odds with the standard parsing
2013  // convention (return true = error) we have instances of a parsed
2014  // directive that fails returning true as an error. Catch these
2015  // cases as best as possible errors here.
2016  if (TPDirectiveReturn && StartTokLoc != getTok().getLoc())
2017  return true;
2018  // Return if we did some parsing or believe we succeeded.
2019  if (!TPDirectiveReturn || StartTokLoc != getTok().getLoc())
2020  return false;
2021 
2022  // Next, check the extension directive map to see if any extension has
2023  // registered itself to parse this directive.
2024  std::pair<MCAsmParserExtension *, DirectiveHandler> Handler =
2025  ExtensionDirectiveMap.lookup(IDVal);
2026  if (Handler.first)
2027  return (*Handler.second)(Handler.first, IDVal, IDLoc);
2028 
2029  // Finally, if no one else is interested in this directive, it must be
2030  // generic and familiar to this class.
2031  switch (DirKind) {
2032  default:
2033  break;
2034  case DK_SET:
2035  case DK_EQU:
2036  return parseDirectiveSet(IDVal, AssignmentKind::Set);
2037  case DK_EQUIV:
2038  return parseDirectiveSet(IDVal, AssignmentKind::Equiv);
2039  case DK_LTO_SET_CONDITIONAL:
2040  return parseDirectiveSet(IDVal, AssignmentKind::LTOSetConditional);
2041  case DK_ASCII:
2042  return parseDirectiveAscii(IDVal, false);
2043  case DK_ASCIZ:
2044  case DK_STRING:
2045  return parseDirectiveAscii(IDVal, true);
2046  case DK_BYTE:
2047  case DK_DC_B:
2048  return parseDirectiveValue(IDVal, 1);
2049  case DK_DC:
2050  case DK_DC_W:
2051  case DK_SHORT:
2052  case DK_VALUE:
2053  case DK_2BYTE:
2054  return parseDirectiveValue(IDVal, 2);
2055  case DK_LONG:
2056  case DK_INT:
2057  case DK_4BYTE:
2058  case DK_DC_L:
2059  return parseDirectiveValue(IDVal, 4);
2060  case DK_QUAD:
2061  case DK_8BYTE:
2062  return parseDirectiveValue(IDVal, 8);
2063  case DK_DC_A:
2064  return parseDirectiveValue(
2065  IDVal, getContext().getAsmInfo()->getCodePointerSize());
2066  case DK_OCTA:
2067  return parseDirectiveOctaValue(IDVal);
2068  case DK_SINGLE:
2069  case DK_FLOAT:
2070  case DK_DC_S:
2071  return parseDirectiveRealValue(IDVal, APFloat::IEEEsingle());
2072  case DK_DOUBLE:
2073  case DK_DC_D:
2074  return parseDirectiveRealValue(IDVal, APFloat::IEEEdouble());
2075  case DK_ALIGN: {
2076  bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
2077  return parseDirectiveAlign(IsPow2, /*ExprSize=*/1);
2078  }
2079  case DK_ALIGN32: {
2080  bool IsPow2 = !getContext().getAsmInfo()->getAlignmentIsInBytes();
2081  return parseDirectiveAlign(IsPow2, /*ExprSize=*/4);
2082  }
2083  case DK_BALIGN:
2084  return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/1);
2085  case DK_BALIGNW:
2086  return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/2);
2087  case DK_BALIGNL:
2088  return parseDirectiveAlign(/*IsPow2=*/false, /*ExprSize=*/4);
2089  case DK_P2ALIGN:
2090  return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/1);
2091  case DK_P2ALIGNW:
2092  return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/2);
2093  case DK_P2ALIGNL:
2094  return parseDirectiveAlign(/*IsPow2=*/true, /*ExprSize=*/4);
2095  case DK_ORG:
2096  return parseDirectiveOrg();
2097  case DK_FILL:
2098  return parseDirectiveFill();
2099  case DK_ZERO:
2100  return parseDirectiveZero();
2101  case DK_EXTERN:
2102  eatToEndOfStatement(); // .extern is the default, ignore it.
2103  return false;
2104  case DK_GLOBL:
2105  case DK_GLOBAL:
2106  return parseDirectiveSymbolAttribute(MCSA_Global);
2107  case DK_LAZY_REFERENCE:
2108  return parseDirectiveSymbolAttribute(MCSA_LazyReference);
2109  case DK_NO_DEAD_STRIP:
2110  return parseDirectiveSymbolAttribute(MCSA_NoDeadStrip);
2111  case DK_SYMBOL_RESOLVER:
2112  return parseDirectiveSymbolAttribute(MCSA_SymbolResolver);
2113  case DK_PRIVATE_EXTERN:
2114  return parseDirectiveSymbolAttribute(MCSA_PrivateExtern);
2115  case DK_REFERENCE:
2116  return parseDirectiveSymbolAttribute(MCSA_Reference);
2117  case DK_WEAK_DEFINITION:
2118  return parseDirectiveSymbolAttribute(MCSA_WeakDefinition);
2119  case DK_WEAK_REFERENCE:
2120  return parseDirectiveSymbolAttribute(MCSA_WeakReference);
2121  case DK_WEAK_DEF_CAN_BE_HIDDEN:
2122  return parseDirectiveSymbolAttribute(MCSA_WeakDefAutoPrivate);
2123  case DK_COLD:
2124  return parseDirectiveSymbolAttribute(MCSA_Cold);
2125  case DK_COMM:
2126  case DK_COMMON:
2127  return parseDirectiveComm(/*IsLocal=*/false);
2128  case DK_LCOMM:
2129  return parseDirectiveComm(/*IsLocal=*/true);
2130  case DK_ABORT:
2131  return parseDirectiveAbort();
2132  case DK_INCLUDE:
2133  return parseDirectiveInclude();
2134  case DK_INCBIN:
2135  return parseDirectiveIncbin();
2136  case DK_CODE16:
2137  case DK_CODE16GCC:
2138  return TokError(Twine(IDVal) +
2139  " not currently supported for this target");
2140  case DK_REPT:
2141  return parseDirectiveRept(IDLoc, IDVal);
2142  case DK_IRP:
2143  return parseDirectiveIrp(IDLoc);
2144  case DK_IRPC:
2145  return parseDirectiveIrpc(IDLoc);
2146  case DK_ENDR:
2147  return parseDirectiveEndr(IDLoc);
2148  case DK_BUNDLE_ALIGN_MODE:
2149  return parseDirectiveBundleAlignMode();
2150  case DK_BUNDLE_LOCK:
2151  return parseDirectiveBundleLock();
2152  case DK_BUNDLE_UNLOCK:
2153  return parseDirectiveBundleUnlock();
2154  case DK_SLEB128:
2155  return parseDirectiveLEB128(true);
2156  case DK_ULEB128:
2157  return parseDirectiveLEB128(false);
2158  case DK_SPACE:
2159  case DK_SKIP:
2160  return parseDirectiveSpace(IDVal);
2161  case DK_FILE:
2162  return parseDirectiveFile(IDLoc);
2163  case DK_LINE:
2164  return parseDirectiveLine();
2165  case DK_LOC:
2166  return parseDirectiveLoc();
2167  case DK_STABS:
2168  return parseDirectiveStabs();
2169  case DK_CV_FILE:
2170  return parseDirectiveCVFile();
2171  case DK_CV_FUNC_ID:
2172  return parseDirectiveCVFuncId();
2173  case DK_CV_INLINE_SITE_ID:
2174  return parseDirectiveCVInlineSiteId();
2175  case DK_CV_LOC:
2176  return parseDirectiveCVLoc();
2177  case DK_CV_LINETABLE:
2178  return parseDirectiveCVLinetable();
2179  case DK_CV_INLINE_LINETABLE:
2180  return parseDirectiveCVInlineLinetable();
2181  case DK_CV_DEF_RANGE:
2182  return parseDirectiveCVDefRange();
2183  case DK_CV_STRING:
2184  return parseDirectiveCVString();
2185  case DK_CV_STRINGTABLE:
2186  return parseDirectiveCVStringTable();
2187  case DK_CV_FILECHECKSUMS:
2188  return parseDirectiveCVFileChecksums();
2189  case DK_CV_FILECHECKSUM_OFFSET:
2190  return parseDirectiveCVFileChecksumOffset();
2191  case DK_CV_FPO_DATA:
2192  return parseDirectiveCVFPOData();
2193  case DK_CFI_SECTIONS:
2194  return parseDirectiveCFISections();
2195  case DK_CFI_STARTPROC:
2196  return parseDirectiveCFIStartProc();
2197  case DK_CFI_ENDPROC:
2198  return parseDirectiveCFIEndProc();
2199  case DK_CFI_DEF_CFA:
2200  return parseDirectiveCFIDefCfa(IDLoc);
2201  case DK_CFI_DEF_CFA_OFFSET:
2202  return parseDirectiveCFIDefCfaOffset();
2203  case DK_CFI_ADJUST_CFA_OFFSET:
2204  return parseDirectiveCFIAdjustCfaOffset();
2205  case DK_CFI_DEF_CFA_REGISTER:
2206  return parseDirectiveCFIDefCfaRegister(IDLoc);
2207  case DK_CFI_LLVM_DEF_ASPACE_CFA:
2208  return parseDirectiveCFILLVMDefAspaceCfa(IDLoc);
2209  case DK_CFI_OFFSET:
2210  return parseDirectiveCFIOffset(IDLoc);
2211  case DK_CFI_REL_OFFSET:
2212  return parseDirectiveCFIRelOffset(IDLoc);
2213  case DK_CFI_PERSONALITY:
2214  return parseDirectiveCFIPersonalityOrLsda(true);
2215  case DK_CFI_LSDA:
2216  return parseDirectiveCFIPersonalityOrLsda(false);
2217  case DK_CFI_REMEMBER_STATE:
2218  return parseDirectiveCFIRememberState();
2219  case DK_CFI_RESTORE_STATE:
2220  return parseDirectiveCFIRestoreState();
2221  case DK_CFI_SAME_VALUE:
2222  return parseDirectiveCFISameValue(IDLoc);
2223  case DK_CFI_RESTORE:
2224  return parseDirectiveCFIRestore(IDLoc);
2225  case DK_CFI_ESCAPE:
2226  return parseDirectiveCFIEscape();
2227  case DK_CFI_RETURN_COLUMN:
2228  return parseDirectiveCFIReturnColumn(IDLoc);
2229  case DK_CFI_SIGNAL_FRAME:
2230  return parseDirectiveCFISignalFrame();
2231  case DK_CFI_UNDEFINED:
2232  return parseDirectiveCFIUndefined(IDLoc);
2233  case DK_CFI_REGISTER:
2234  return parseDirectiveCFIRegister(IDLoc);
2235  case DK_CFI_WINDOW_SAVE:
2236  return parseDirectiveCFIWindowSave();
2237  case DK_MACROS_ON:
2238  case DK_MACROS_OFF:
2239  return parseDirectiveMacrosOnOff(IDVal);
2240  case DK_MACRO:
2241  return parseDirectiveMacro(IDLoc);
2242  case DK_ALTMACRO:
2243  case DK_NOALTMACRO:
2244  return parseDirectiveAltmacro(IDVal);
2245  case DK_EXITM:
2246  return parseDirectiveExitMacro(IDVal);
2247  case DK_ENDM:
2248  case DK_ENDMACRO:
2249  return parseDirectiveEndMacro(IDVal);
2250  case DK_PURGEM:
2251  return parseDirectivePurgeMacro(IDLoc);
2252  case DK_END:
2253  return parseDirectiveEnd(IDLoc);
2254  case DK_ERR:
2255  return parseDirectiveError(IDLoc, false);
2256  case DK_ERROR:
2257  return parseDirectiveError(IDLoc, true);
2258  case DK_WARNING:
2259  return parseDirectiveWarning(IDLoc);
2260  case DK_RELOC:
2261  return parseDirectiveReloc(IDLoc);
2262  case DK_DCB:
2263  case DK_DCB_W:
2264  return parseDirectiveDCB(IDVal, 2);
2265  case DK_DCB_B:
2266  return parseDirectiveDCB(IDVal, 1);
2267  case DK_DCB_D:
2268  return parseDirectiveRealDCB(IDVal, APFloat::IEEEdouble());
2269  case DK_DCB_L:
2270  return parseDirectiveDCB(IDVal, 4);
2271  case DK_DCB_S:
2272  return parseDirectiveRealDCB(IDVal, APFloat::IEEEsingle());
2273  case DK_DC_X:
2274  case DK_DCB_X:
2275  return TokError(Twine(IDVal) +
2276  " not currently supported for this target");
2277  case DK_DS:
2278  case DK_DS_W:
2279  return parseDirectiveDS(IDVal, 2);
2280  case DK_DS_B:
2281  return parseDirectiveDS(IDVal, 1);
2282  case DK_DS_D:
2283  return parseDirectiveDS(IDVal, 8);
2284  case DK_DS_L:
2285  case DK_DS_S:
2286  return parseDirectiveDS(IDVal, 4);
2287  case DK_DS_P:
2288  case DK_DS_X:
2289  return parseDirectiveDS(IDVal, 12);
2290  case DK_PRINT:
2291  return parseDirectivePrint(IDLoc);
2292  case DK_ADDRSIG:
2293  return parseDirectiveAddrsig();
2294  case DK_ADDRSIG_SYM:
2295  return parseDirectiveAddrsigSym();
2296  case DK_PSEUDO_PROBE:
2297  return parseDirectivePseudoProbe();
2298  case DK_LTO_DISCARD:
2299  return parseDirectiveLTODiscard();
2300  }
2301 
2302  return Error(IDLoc, "unknown directive");
2303  }
2304 
2305  // __asm _emit or __asm __emit
2306  if (ParsingMSInlineAsm && (IDVal == "_emit" || IDVal == "__emit" ||
2307  IDVal == "_EMIT" || IDVal == "__EMIT"))
2308  return parseDirectiveMSEmit(IDLoc, Info, IDVal.size());
2309 
2310  // __asm align
2311  if (ParsingMSInlineAsm && (IDVal == "align" || IDVal == "ALIGN"))
2312  return parseDirectiveMSAlign(IDLoc, Info);
2313 
2314  if (ParsingMSInlineAsm && (IDVal == "even" || IDVal == "EVEN"))
2315  Info.AsmRewrites->emplace_back(AOK_EVEN, IDLoc, 4);
2316  if (checkForValidSection())
2317  return true;
2318 
2319  return parseAndMatchAndEmitTargetInstruction(Info, IDVal, ID, IDLoc);
2320 }
2321 
2322 bool AsmParser::parseAndMatchAndEmitTargetInstruction(ParseStatementInfo &Info,
2323  StringRef IDVal,
2324  AsmToken ID,
2325  SMLoc IDLoc) {
2326  // Canonicalize the opcode to lower case.
2327  std::string OpcodeStr = IDVal.lower();
2328  ParseInstructionInfo IInfo(Info.AsmRewrites);
2329  bool ParseHadError = getTargetParser().ParseInstruction(IInfo, OpcodeStr, ID,
2330  Info.ParsedOperands);
2331  Info.ParseError = ParseHadError;
2332 
2333  // Dump the parsed representation, if requested.
2334  if (getShowParsedOperands()) {
2335  SmallString<256> Str;
2336  raw_svector_ostream OS(Str);
2337  OS << "parsed instruction: [";
2338  for (unsigned i = 0; i != Info.ParsedOperands.size(); ++i) {
2339  if (i != 0)
2340  OS << ", ";
2341  Info.ParsedOperands[i]->print(OS);
2342  }
2343  OS << "]";
2344 
2345  printMessage(IDLoc, SourceMgr::DK_Note, OS.str());
2346  }
2347 
2348  // Fail even if ParseInstruction erroneously returns false.
2349  if (hasPendingError() || ParseHadError)
2350  return true;
2351 
2352  // If we are generating dwarf for the current section then generate a .loc
2353  // directive for the instruction.
2354  if (!ParseHadError && enabledGenDwarfForAssembly() &&
2355  getContext().getGenDwarfSectionSyms().count(
2356  getStreamer().getCurrentSectionOnly())) {
2357  unsigned Line;
2358  if (ActiveMacros.empty())
2359  Line = SrcMgr.FindLineNumber(IDLoc, CurBuffer);
2360  else
2361  Line = SrcMgr.FindLineNumber(ActiveMacros.front()->InstantiationLoc,
2362  ActiveMacros.front()->ExitBuffer);
2363 
2364  // If we previously parsed a cpp hash file line comment then make sure the
2365  // current Dwarf File is for the CppHashFilename if not then emit the
2366  // Dwarf File table for it and adjust the line number for the .loc.
2367  if (!CppHashInfo.Filename.empty()) {
2368  unsigned FileNumber = getStreamer().emitDwarfFileDirective(
2369  0, StringRef(), CppHashInfo.Filename);
2370  getContext().setGenDwarfFileNumber(FileNumber);
2371 
2372  unsigned CppHashLocLineNo =
2373  SrcMgr.FindLineNumber(CppHashInfo.Loc, CppHashInfo.Buf);
2374  Line = CppHashInfo.LineNumber - 1 + (Line - CppHashLocLineNo);
2375  }
2376 
2377  getStreamer().emitDwarfLocDirective(
2378  getContext().getGenDwarfFileNumber(), Line, 0,
2380  StringRef());
2381  }
2382 
2383  // If parsing succeeded, match the instruction.
2384  if (!ParseHadError) {
2386  if (getTargetParser().MatchAndEmitInstruction(
2387  IDLoc, Info.Opcode, Info.ParsedOperands, Out, ErrorInfo,
2388  getTargetParser().isParsingMSInlineAsm()))
2389  return true;
2390  }
2391  return false;
2392 }
2393 
2394 // Parse and erase curly braces marking block start/end
2395 bool
2396 AsmParser::parseCurlyBlockScope(SmallVectorImpl<AsmRewrite> &AsmStrRewrites) {
2397  // Identify curly brace marking block start/end
2398  if (Lexer.isNot(AsmToken::LCurly) && Lexer.isNot(AsmToken::RCurly))
2399  return false;
2400 
2401  SMLoc StartLoc = Lexer.getLoc();
2402  Lex(); // Eat the brace
2403  if (Lexer.is(AsmToken::EndOfStatement))
2404  Lex(); // Eat EndOfStatement following the brace
2405 
2406  // Erase the block start/end brace from the output asm string
2407  AsmStrRewrites.emplace_back(AOK_Skip, StartLoc, Lexer.getLoc().getPointer() -
2408  StartLoc.getPointer());
2409  return true;
2410 }
2411 
2412 /// parseCppHashLineFilenameComment as this:
2413 /// ::= # number "filename"
2414 bool AsmParser::parseCppHashLineFilenameComment(SMLoc L, bool SaveLocInfo) {
2415  Lex(); // Eat the hash token.
2416  // Lexer only ever emits HashDirective if it fully formed if it's
2417  // done the checking already so this is an internal error.
2418  assert(getTok().is(AsmToken::Integer) &&
2419  "Lexing Cpp line comment: Expected Integer");
2420  int64_t LineNumber = getTok().getIntVal();
2421  Lex();
2422  assert(getTok().is(AsmToken::String) &&
2423  "Lexing Cpp line comment: Expected String");
2424  StringRef Filename = getTok().getString();
2425  Lex();
2426 
2427  if (!SaveLocInfo)
2428  return false;
2429 
2430  // Get rid of the enclosing quotes.
2431  Filename = Filename.substr(1, Filename.size() - 2);
2432 
2433  // Save the SMLoc, Filename and LineNumber for later use by diagnostics
2434  // and possibly DWARF file info.
2435  CppHashInfo.Loc = L;
2436  CppHashInfo.Filename = Filename;
2437  CppHashInfo.LineNumber = LineNumber;
2438  CppHashInfo.Buf = CurBuffer;
2439  if (FirstCppHashFilename.empty())
2440  FirstCppHashFilename = Filename;
2441  return false;
2442 }
2443 
2444 /// will use the last parsed cpp hash line filename comment
2445 /// for the Filename and LineNo if any in the diagnostic.
2446 void AsmParser::DiagHandler(const SMDiagnostic &Diag, void *Context) {
2447  auto *Parser = static_cast<AsmParser *>(Context);
2448  raw_ostream &OS = errs();
2449 
2450  const SourceMgr &DiagSrcMgr = *Diag.getSourceMgr();
2451  SMLoc DiagLoc = Diag.getLoc();
2452  unsigned DiagBuf = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
2453  unsigned CppHashBuf =
2454  Parser->SrcMgr.FindBufferContainingLoc(Parser->CppHashInfo.Loc);
2455 
2456  // Like SourceMgr::printMessage() we need to print the include stack if any
2457  // before printing the message.
2458  unsigned DiagCurBuffer = DiagSrcMgr.FindBufferContainingLoc(DiagLoc);
2459  if (!Parser->SavedDiagHandler && DiagCurBuffer &&
2460  DiagCurBuffer != DiagSrcMgr.getMainFileID()) {
2461  SMLoc ParentIncludeLoc = DiagSrcMgr.getParentIncludeLoc(DiagCurBuffer);
2462  DiagSrcMgr.PrintIncludeStack(ParentIncludeLoc, OS);
2463  }
2464 
2465  // If we have not parsed a cpp hash line filename comment or the source
2466  // manager changed or buffer changed (like in a nested include) then just
2467  // print the normal diagnostic using its Filename and LineNo.
2468  if (!Parser->CppHashInfo.LineNumber || DiagBuf != CppHashBuf) {
2469  if (Parser->SavedDiagHandler)
2470  Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
2471  else
2472  Parser->getContext().diagnose(Diag);
2473  return;
2474  }
2475 
2476  // Use the CppHashFilename and calculate a line number based on the
2477  // CppHashInfo.Loc and CppHashInfo.LineNumber relative to this Diag's SMLoc
2478  // for the diagnostic.
2479  const std::string &Filename = std::string(Parser->CppHashInfo.Filename);
2480 
2481  int DiagLocLineNo = DiagSrcMgr.FindLineNumber(DiagLoc, DiagBuf);
2482  int CppHashLocLineNo =
2483  Parser->SrcMgr.FindLineNumber(Parser->CppHashInfo.Loc, CppHashBuf);
2484  int LineNo =
2485  Parser->CppHashInfo.LineNumber - 1 + (DiagLocLineNo - CppHashLocLineNo);
2486 
2487  SMDiagnostic NewDiag(*Diag.getSourceMgr(), Diag.getLoc(), Filename, LineNo,
2488  Diag.getColumnNo(), Diag.getKind(), Diag.getMessage(),
2489  Diag.getLineContents(), Diag.getRanges());
2490 
2491  if (Parser->SavedDiagHandler)
2492  Parser->SavedDiagHandler(Diag, Parser->SavedDiagContext);
2493  else
2494  Parser->getContext().diagnose(NewDiag);
2495 }
2496 
2497 // FIXME: This is mostly duplicated from the function in AsmLexer.cpp. The
2498 // difference being that that function accepts '@' as part of identifiers and
2499 // we can't do that. AsmLexer.cpp should probably be changed to handle
2500 // '@' as a special case when needed.
2501 static bool isIdentifierChar(char c) {
2502  return isalnum(static_cast<unsigned char>(c)) || c == '_' || c == '$' ||
2503  c == '.';
2504 }
2505 
2506 bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
2507  ArrayRef<MCAsmMacroParameter> Parameters,
2509  bool EnableAtPseudoVariable, SMLoc L) {
2510  unsigned NParameters = Parameters.size();
2511  bool HasVararg = NParameters ? Parameters.back().Vararg : false;
2512  if ((!IsDarwin || NParameters != 0) && NParameters != A.size())
2513  return Error(L, "Wrong number of arguments");
2514 
2515  // A macro without parameters is handled differently on Darwin:
2516  // gas accepts no arguments and does no substitutions
2517  while (!Body.empty()) {
2518  // Scan for the next substitution.
2519  std::size_t End = Body.size(), Pos = 0;
2520  for (; Pos != End; ++Pos) {
2521  // Check for a substitution or escape.
2522  if (IsDarwin && !NParameters) {
2523  // This macro has no parameters, look for $0, $1, etc.
2524  if (Body[Pos] != '$' || Pos + 1 == End)
2525  continue;
2526 
2527  char Next = Body[Pos + 1];
2528  if (Next == '$' || Next == 'n' ||
2529  isdigit(static_cast<unsigned char>(Next)))
2530  break;
2531  } else {
2532  // This macro has parameters, look for \foo, \bar, etc.
2533  if (Body[Pos] == '\\' && Pos + 1 != End)
2534  break;
2535  }
2536  }
2537 
2538  // Add the prefix.
2539  OS << Body.slice(0, Pos);
2540 
2541  // Check if we reached the end.
2542  if (Pos == End)
2543  break;
2544 
2545  if (IsDarwin && !NParameters) {
2546  switch (Body[Pos + 1]) {
2547  // $$ => $
2548  case '$':
2549  OS << '$';
2550  break;
2551 
2552  // $n => number of arguments
2553  case 'n':
2554  OS << A.size();
2555  break;
2556 
2557  // $[0-9] => argument
2558  default: {
2559  // Missing arguments are ignored.
2560  unsigned Index = Body[Pos + 1] - '0';
2561  if (Index >= A.size())
2562  break;
2563 
2564  // Otherwise substitute with the token values, with spaces eliminated.
2565  for (const AsmToken &Token : A[Index])
2566  OS << Token.getString();
2567  break;
2568  }
2569  }
2570  Pos += 2;
2571  } else {
2572  unsigned I = Pos + 1;
2573 
2574  // Check for the \@ pseudo-variable.
2575  if (EnableAtPseudoVariable && Body[I] == '@' && I + 1 != End)
2576  ++I;
2577  else
2578  while (isIdentifierChar(Body[I]) && I + 1 != End)
2579  ++I;
2580 
2581  const char *Begin = Body.data() + Pos + 1;
2582  StringRef Argument(Begin, I - (Pos + 1));
2583  unsigned Index = 0;
2584 
2585  if (Argument == "@") {
2586  OS << NumOfMacroInstantiations;
2587  Pos += 2;
2588  } else {
2589  for (; Index < NParameters; ++Index)
2590  if (Parameters[Index].Name == Argument)
2591  break;
2592 
2593  if (Index == NParameters) {
2594  if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
2595  Pos += 3;
2596  else {
2597  OS << '\\' << Argument;
2598  Pos = I;
2599  }
2600  } else {
2601  bool VarargParameter = HasVararg && Index == (NParameters - 1);
2602  for (const AsmToken &Token : A[Index])
2603  // For altmacro mode, you can write '%expr'.
2604  // The prefix '%' evaluates the expression 'expr'
2605  // and uses the result as a string (e.g. replace %(1+2) with the
2606  // string "3").
2607  // Here, we identify the integer token which is the result of the
2608  // absolute expression evaluation and replace it with its string
2609  // representation.
2610  if (AltMacroMode && Token.getString().front() == '%' &&
2611  Token.is(AsmToken::Integer))
2612  // Emit an integer value to the buffer.
2613  OS << Token.getIntVal();
2614  // Only Token that was validated as a string and begins with '<'
2615  // is considered altMacroString!!!
2616  else if (AltMacroMode && Token.getString().front() == '<' &&
2617  Token.is(AsmToken::String)) {
2618  OS << angleBracketString(Token.getStringContents());
2619  }
2620  // We expect no quotes around the string's contents when
2621  // parsing for varargs.
2622  else if (Token.isNot(AsmToken::String) || VarargParameter)
2623  OS << Token.getString();
2624  else
2625  OS << Token.getStringContents();
2626 
2627  Pos += 1 + Argument.size();
2628  }
2629  }
2630  }
2631  // Update the scan point.
2632  Body = Body.substr(Pos);
2633  }
2634 
2635  return false;
2636 }
2637 
2638 static bool isOperator(AsmToken::TokenKind kind) {
2639  switch (kind) {
2640  default:
2641  return false;
2642  case AsmToken::Plus:
2643  case AsmToken::Minus:
2644  case AsmToken::Tilde:
2645  case AsmToken::Slash:
2646  case AsmToken::Star:
2647  case AsmToken::Dot:
2648  case AsmToken::Equal:
2649  case AsmToken::EqualEqual:
2650  case AsmToken::Pipe:
2651  case AsmToken::PipePipe:
2652  case AsmToken::Caret:
2653  case AsmToken::Amp:
2654  case AsmToken::AmpAmp:
2655  case AsmToken::Exclaim:
2656  case AsmToken::ExclaimEqual:
2657  case AsmToken::Less:
2658  case AsmToken::LessEqual:
2659  case AsmToken::LessLess:
2660  case AsmToken::LessGreater:
2661  case AsmToken::Greater:
2662  case AsmToken::GreaterEqual:
2663  case AsmToken::GreaterGreater:
2664  return true;
2665  }
2666 }
2667 
2668 namespace {
2669 
2670 class AsmLexerSkipSpaceRAII {
2671 public:
2672  AsmLexerSkipSpaceRAII(AsmLexer &Lexer, bool SkipSpace) : Lexer(Lexer) {
2673  Lexer.setSkipSpace(SkipSpace);
2674  }
2675 
2676  ~AsmLexerSkipSpaceRAII() {
2677  Lexer.setSkipSpace(true);
2678  }
2679 
2680 private:
2681  AsmLexer &Lexer;
2682 };
2683 
2684 } // end anonymous namespace
2685 
2686 bool AsmParser::parseMacroArgument(MCAsmMacroArgument &MA, bool Vararg) {
2687 
2688  if (Vararg) {
2689  if (Lexer.isNot(AsmToken::EndOfStatement)) {
2690  StringRef Str = parseStringToEndOfStatement();
2691  MA.emplace_back(AsmToken::String, Str);
2692  }
2693  return false;
2694  }
2695 
2696  unsigned ParenLevel = 0;
2697 
2698  // Darwin doesn't use spaces to delmit arguments.
2699  AsmLexerSkipSpaceRAII ScopedSkipSpace(Lexer, IsDarwin);
2700 
2701  bool SpaceEaten;
2702 
2703  while (true) {
2704  SpaceEaten = false;
2705  if (Lexer.is(AsmToken::Eof) || Lexer.is(AsmToken::Equal))
2706  return TokError("unexpected token in macro instantiation");
2707 
2708  if (ParenLevel == 0) {
2709 
2710  if (Lexer.is(AsmToken::Comma))
2711  break;
2712 
2713  if (Lexer.is(AsmToken::Space)) {
2714  SpaceEaten = true;
2715  Lexer.Lex(); // Eat spaces
2716  }
2717 
2718  // Spaces can delimit parameters, but could also be part an expression.
2719  // If the token after a space is an operator, add the token and the next
2720  // one into this argument
2721  if (!IsDarwin) {
2722  if (isOperator(Lexer.getKind())) {
2723  MA.push_back(getTok());
2724  Lexer.Lex();
2725 
2726  // Whitespace after an operator can be ignored.
2727  if (Lexer.is(AsmToken::Space))
2728  Lexer.Lex();
2729 
2730  continue;
2731  }
2732  }
2733  if (SpaceEaten)
2734  break;
2735  }
2736 
2737  // handleMacroEntry relies on not advancing the lexer here
2738  // to be able to fill in the remaining default parameter values
2739  if (Lexer.is(AsmToken::EndOfStatement))
2740  break;
2741 
2742  // Adjust the current parentheses level.
2743  if (Lexer.is(AsmToken::LParen))
2744  ++ParenLevel;
2745  else if (Lexer.is(AsmToken::RParen) && ParenLevel)
2746  --ParenLevel;
2747 
2748  // Append the token to the current argument list.
2749  MA.push_back(getTok());
2750  Lexer.Lex();
2751  }
2752 
2753  if (ParenLevel != 0)
2754  return TokError("unbalanced parentheses in macro argument");
2755  return false;
2756 }
2757 
2758 // Parse the macro instantiation arguments.
2759 bool AsmParser::parseMacroArguments(const MCAsmMacro *M,
2760  MCAsmMacroArguments &A) {
2761  const unsigned NParameters = M ? M->Parameters.size() : 0;
2762  bool NamedParametersFound = false;
2763  SmallVector<SMLoc, 4> FALocs;
2764 
2765  A.resize(NParameters);
2766  FALocs.resize(NParameters);
2767 
2768  // Parse two kinds of macro invocations:
2769  // - macros defined without any parameters accept an arbitrary number of them
2770  // - macros defined with parameters accept at most that many of them
2771  bool HasVararg = NParameters ? M->Parameters.back().Vararg : false;
2772  for (unsigned Parameter = 0; !NParameters || Parameter < NParameters;
2773  ++Parameter) {
2774  SMLoc IDLoc = Lexer.getLoc();
2776 
2777  if (Lexer.is(AsmToken::Identifier) && Lexer.peekTok().is(AsmToken::Equal)) {
2778  if (parseIdentifier(FA.Name))
2779  return Error(IDLoc, "invalid argument identifier for formal argument");
2780 
2781  if (Lexer.isNot(AsmToken::Equal))
2782  return TokError("expected '=' after formal parameter identifier");
2783 
2784  Lex();
2785 
2786  NamedParametersFound = true;
2787  }
2788  bool Vararg = HasVararg && Parameter == (NParameters - 1);
2789 
2790  if (NamedParametersFound && FA.Name.empty())
2791  return Error(IDLoc, "cannot mix positional and keyword arguments");
2792 
2793  SMLoc StrLoc = Lexer.getLoc();
2794  SMLoc EndLoc;
2795  if (AltMacroMode && Lexer.is(AsmToken::Percent)) {
2796  const MCExpr *AbsoluteExp;
2797  int64_t Value;
2798  /// Eat '%'
2799  Lex();
2800  if (parseExpression(AbsoluteExp, EndLoc))
2801  return false;
2802  if (!AbsoluteExp->evaluateAsAbsolute(Value,
2803  getStreamer().getAssemblerPtr()))
2804  return Error(StrLoc, "expected absolute expression");
2805  const char *StrChar = StrLoc.getPointer();
2806  const char *EndChar = EndLoc.getPointer();
2807  AsmToken newToken(AsmToken::Integer,
2808  StringRef(StrChar, EndChar - StrChar), Value);
2809  FA.Value.push_back(newToken);
2810  } else if (AltMacroMode && Lexer.is(AsmToken::Less) &&
2811  isAngleBracketString(StrLoc, EndLoc)) {
2812  const char *StrChar = StrLoc.getPointer();
2813  const char *EndChar = EndLoc.getPointer();
2814  jumpToLoc(EndLoc, CurBuffer);
2815  /// Eat from '<' to '>'
2816  Lex();
2817  AsmToken newToken(AsmToken::String,
2818  StringRef(StrChar, EndChar - StrChar));
2819  FA.Value.push_back(newToken);
2820  } else if(parseMacroArgument(FA.Value, Vararg))
2821  return true;
2822 
2823  unsigned PI = Parameter;
2824  if (!FA.Name.empty()) {
2825  unsigned FAI = 0;
2826  for (FAI = 0; FAI < NParameters; ++FAI)
2827  if (M->Parameters[FAI].Name == FA.Name)
2828  break;
2829 
2830  if (FAI >= NParameters) {
2831  assert(M && "expected macro to be defined");
2832  return Error(IDLoc, "parameter named '" + FA.Name +
2833  "' does not exist for macro '" + M->Name + "'");
2834  }
2835  PI = FAI;
2836  }
2837 
2838  if (!FA.Value.empty()) {
2839  if (A.size() <= PI)
2840  A.resize(PI + 1);
2841  A[PI] = FA.Value;
2842 
2843  if (FALocs.size() <= PI)
2844  FALocs.resize(PI + 1);
2845 
2846  FALocs[PI] = Lexer.getLoc();
2847  }
2848 
2849  // At the end of the statement, fill in remaining arguments that have
2850  // default values. If there aren't any, then the next argument is
2851  // required but missing
2852  if (Lexer.is(AsmToken::EndOfStatement)) {
2853  bool Failure = false;
2854  for (unsigned FAI = 0; FAI < NParameters; ++FAI) {
2855  if (A[FAI].empty()) {
2856  if (M->Parameters[FAI].Required) {
2857  Error(FALocs[FAI].isValid() ? FALocs[FAI] : Lexer.getLoc(),
2858  "missing value for required parameter "
2859  "'" + M->Parameters[FAI].Name + "' in macro '" + M->Name + "'");
2860  Failure = true;
2861  }
2862 
2863  if (!M->Parameters[FAI].Value.empty())
2864  A[FAI] = M->Parameters[FAI].Value;
2865  }
2866  }
2867  return Failure;
2868  }
2869 
2870  if (Lexer.is(AsmToken::Comma))
2871  Lex();
2872  }
2873 
2874  return TokError("too many positional arguments");
2875 }
2876 
2877 bool AsmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
2878  // Arbitrarily limit macro nesting depth (default matches 'as'). We can
2879  // eliminate this, although we should protect against infinite loops.
2880  unsigned MaxNestingDepth = AsmMacroMaxNestingDepth;
2881  if (ActiveMacros.size() == MaxNestingDepth) {
2882  std::ostringstream MaxNestingDepthError;
2883  MaxNestingDepthError << "macros cannot be nested more than "
2884  << MaxNestingDepth << " levels deep."
2885  << " Use -asm-macro-max-nesting-depth to increase "
2886  "this limit.";
2887  return TokError(MaxNestingDepthError.str());
2888  }
2889 
2890  MCAsmMacroArguments A;
2891  if (parseMacroArguments(M, A))
2892  return true;
2893 
2894  // Macro instantiation is lexical, unfortunately. We construct a new buffer
2895  // to hold the macro body with substitutions.
2896  SmallString<256> Buf;
2897  StringRef Body = M->Body;
2898  raw_svector_ostream OS(Buf);
2899 
2900  if (expandMacro(OS, Body, M->Parameters, A, true, getTok().getLoc()))
2901  return true;
2902 
2903  // We include the .endmacro in the buffer as our cue to exit the macro
2904  // instantiation.
2905  OS << ".endmacro\n";
2906 
2907  std::unique_ptr<MemoryBuffer> Instantiation =
2908  MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
2909 
2910  // Create the macro instantiation object and add to the current macro
2911  // instantiation stack.
2912  MacroInstantiation *MI = new MacroInstantiation{
2913  NameLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()};
2914  ActiveMacros.push_back(MI);
2915 
2916  ++NumOfMacroInstantiations;
2917 
2918  // Jump to the macro instantiation and prime the lexer.
2919  CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
2920  Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
2921  Lex();
2922 
2923  return false;
2924 }
2925 
2926 void AsmParser::handleMacroExit() {
2927  // Jump to the EndOfStatement we should return to, and consume it.
2928  jumpToLoc(ActiveMacros.back()->ExitLoc, ActiveMacros.back()->ExitBuffer);
2929  Lex();
2930 
2931  // Pop the instantiation entry.
2932  delete ActiveMacros.back();
2933  ActiveMacros.pop_back();
2934 }
2935 
2936 bool AsmParser::parseAssignment(StringRef Name, AssignmentKind Kind) {
2937  MCSymbol *Sym;
2938  const MCExpr *Value;
2939  SMLoc ExprLoc = getTok().getLoc();
2940  bool AllowRedef =
2941  Kind == AssignmentKind::Set || Kind == AssignmentKind::Equal;
2942  if (MCParserUtils::parseAssignmentExpression(Name, AllowRedef, *this, Sym,
2943  Value))
2944  return true;
2945 
2946  if (!Sym) {
2947  // In the case where we parse an expression starting with a '.', we will
2948  // not generate an error, nor will we create a symbol. In this case we
2949  // should just return out.
2950  return false;
2951  }
2952 
2953  if (discardLTOSymbol(Name))
2954  return false;
2955 
2956  // Do the assignment.
2957  switch (Kind) {
2958  case AssignmentKind::Equal:
2959  Out.emitAssignment(Sym, Value);
2960  break;
2961  case AssignmentKind::Set:
2962  case AssignmentKind::Equiv:
2963  Out.emitAssignment(Sym, Value);
2965  break;
2966  case AssignmentKind::LTOSetConditional:
2967  if (Value->getKind() != MCExpr::SymbolRef)
2968  return Error(ExprLoc, "expected identifier");
2969 
2970  Out.emitConditionalAssignment(Sym, Value);
2971  break;
2972  }
2973 
2974  return false;
2975 }
2976 
2977 /// parseIdentifier:
2978 /// ::= identifier
2979 /// ::= string
2980 bool AsmParser::parseIdentifier(StringRef &Res) {
2981  // The assembler has relaxed rules for accepting identifiers, in particular we
2982  // allow things like '.globl $foo' and '.def @feat.00', which would normally be
2983  // separate tokens. At this level, we have already lexed so we cannot (currently)
2984  // handle this as a context dependent token, instead we detect adjacent tokens
2985  // and return the combined identifier.
2986  if (Lexer.is(AsmToken::Dollar) || Lexer.is(AsmToken::At)) {
2987  SMLoc PrefixLoc = getLexer().getLoc();
2988 
2989  // Consume the prefix character, and check for a following identifier.
2990 
2991  AsmToken Buf[1];
2992  Lexer.peekTokens(Buf, false);
2993 
2994  if (Buf[0].isNot(AsmToken::Identifier) && Buf[0].isNot(AsmToken::Integer))
2995  return true;
2996 
2997  // We have a '$' or '@' followed by an identifier or integer token, make
2998  // sure they are adjacent.
2999  if (PrefixLoc.getPointer() + 1 != Buf[0].getLoc().getPointer())
3000  return true;
3001 
3002  // eat $ or @
3003  Lexer.Lex(); // Lexer's Lex guarantees consecutive token.
3004  // Construct the joined identifier and consume the token.
3005  Res = StringRef(PrefixLoc.getPointer(), getTok().getString().size() + 1);
3006  Lex(); // Parser Lex to maintain invariants.
3007  return false;
3008  }
3009 
3010  if (Lexer.isNot(AsmToken::Identifier) && Lexer.isNot(AsmToken::String))
3011  return true;
3012 
3013  Res = getTok().getIdentifier();
3014 
3015  Lex(); // Consume the identifier token.
3016 
3017  return false;
3018 }
3019 
3020 /// parseDirectiveSet:
3021 /// ::= .equ identifier ',' expression
3022 /// ::= .equiv identifier ',' expression
3023 /// ::= .set identifier ',' expression
3024 /// ::= .lto_set_conditional identifier ',' expression
3025 bool AsmParser::parseDirectiveSet(StringRef IDVal, AssignmentKind Kind) {
3026  StringRef Name;
3027  if (check(parseIdentifier(Name), "expected identifier") || parseComma() ||
3028  parseAssignment(Name, Kind))
3029  return true;
3030  return false;
3031 }
3032 
3033 bool AsmParser::parseEscapedString(std::string &Data) {
3034  if (check(getTok().isNot(AsmToken::String), "expected string"))
3035  return true;
3036 
3037  Data = "";
3038  StringRef Str = getTok().getStringContents();
3039  for (unsigned i = 0, e = Str.size(); i != e; ++i) {
3040  if (Str[i] != '\\') {
3041  Data += Str[i];
3042  continue;
3043  }
3044 
3045  // Recognize escaped characters. Note that this escape semantics currently
3046  // loosely follows Darwin 'as'.
3047  ++i;
3048  if (i == e)
3049  return TokError("unexpected backslash at end of string");
3050 
3051  // Recognize hex sequences similarly to GNU 'as'.
3052  if (Str[i] == 'x' || Str[i] == 'X') {
3053  size_t length = Str.size();
3054  if (i + 1 >= length || !isHexDigit(Str[i + 1]))
3055  return TokError("invalid hexadecimal escape sequence");
3056 
3057  // Consume hex characters. GNU 'as' reads all hexadecimal characters and
3058  // then truncates to the lower 16 bits. Seems reasonable.
3059  unsigned Value = 0;
3060  while (i + 1 < length && isHexDigit(Str[i + 1]))
3061  Value = Value * 16 + hexDigitValue(Str[++i]);
3062 
3063  Data += (unsigned char)(Value & 0xFF);
3064  continue;
3065  }
3066 
3067  // Recognize octal sequences.
3068  if ((unsigned)(Str[i] - '0') <= 7) {
3069  // Consume up to three octal characters.
3070  unsigned Value = Str[i] - '0';
3071 
3072  if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
3073  ++i;
3074  Value = Value * 8 + (Str[i] - '0');
3075 
3076  if (i + 1 != e && ((unsigned)(Str[i + 1] - '0')) <= 7) {
3077  ++i;
3078  Value = Value * 8 + (Str[i] - '0');
3079  }
3080  }
3081 
3082  if (Value > 255)
3083  return TokError("invalid octal escape sequence (out of range)");
3084 
3085  Data += (unsigned char)Value;
3086  continue;
3087  }
3088 
3089  // Otherwise recognize individual escapes.
3090  switch (Str[i]) {
3091  default:
3092  // Just reject invalid escape sequences for now.
3093  return TokError("invalid escape sequence (unrecognized character)");
3094 
3095  case 'b': Data += '\b'; break;
3096  case 'f': Data += '\f'; break;
3097  case 'n': Data += '\n'; break;
3098  case 'r': Data += '\r'; break;
3099  case 't': Data += '\t'; break;
3100  case '"': Data += '"'; break;
3101  case '\\': Data += '\\'; break;
3102  }
3103  }
3104 
3105  Lex();
3106  return false;
3107 }
3108 
3109 bool AsmParser::parseAngleBracketString(std::string &Data) {
3110  SMLoc EndLoc, StartLoc = getTok().getLoc();
3111  if (isAngleBracketString(StartLoc, EndLoc)) {
3112  const char *StartChar = StartLoc.getPointer() + 1;
3113  const char *EndChar = EndLoc.getPointer() - 1;
3114  jumpToLoc(EndLoc, CurBuffer);
3115  /// Eat from '<' to '>'
3116  Lex();
3117 
3118  Data = angleBracketString(StringRef(StartChar, EndChar - StartChar));
3119  return false;
3120  }
3121  return true;
3122 }
3123 
3124 /// parseDirectiveAscii:
3125 // ::= .ascii [ "string"+ ( , "string"+ )* ]
3126 /// ::= ( .asciz | .string ) [ "string" ( , "string" )* ]
3127 bool AsmParser::parseDirectiveAscii(StringRef IDVal, bool ZeroTerminated) {
3128  auto parseOp = [&]() -> bool {
3129  std::string Data;
3130  if (checkForValidSection())
3131  return true;
3132  // Only support spaces as separators for .ascii directive for now. See the
3133  // discusssion at https://reviews.llvm.org/D91460 for more details.
3134  do {
3135  if (parseEscapedString(Data))
3136  return true;
3137  getStreamer().emitBytes(Data);
3138  } while (!ZeroTerminated && getTok().is(AsmToken::String));
3139  if (ZeroTerminated)
3140  getStreamer().emitBytes(StringRef("\0", 1));
3141  return false;
3142  };
3143 
3144  return parseMany(parseOp);
3145 }
3146 
3147 /// parseDirectiveReloc
3148 /// ::= .reloc expression , identifier [ , expression ]
3149 bool AsmParser::parseDirectiveReloc(SMLoc DirectiveLoc) {
3150  const MCExpr *Offset;
3151  const MCExpr *Expr = nullptr;
3152  SMLoc OffsetLoc = Lexer.getTok().getLoc();
3153 
3154  if (parseExpression(Offset))
3155  return true;
3156  if (parseComma() ||
3157  check(getTok().isNot(AsmToken::Identifier), "expected relocation name"))
3158  return true;
3159 
3160  SMLoc NameLoc = Lexer.getTok().getLoc();
3161  StringRef Name = Lexer.getTok().getIdentifier();
3162  Lex();
3163 
3164  if (Lexer.is(AsmToken::Comma)) {
3165  Lex();
3166  SMLoc ExprLoc = Lexer.getLoc();
3167  if (parseExpression(Expr))
3168  return true;
3169 
3170  MCValue Value;
3171  if (!Expr->evaluateAsRelocatable(Value, nullptr, nullptr))
3172  return Error(ExprLoc, "expression must be relocatable");
3173  }
3174 
3175  if (parseEOL())
3176  return true;
3177 
3178  const MCTargetAsmParser &MCT = getTargetParser();
3179  const MCSubtargetInfo &STI = MCT.getSTI();
3180  if (Optional<std::pair<bool, std::string>> Err =
3181  getStreamer().emitRelocDirective(*Offset, Name, Expr, DirectiveLoc,
3182  STI))
3183  return Error(Err->first ? NameLoc : OffsetLoc, Err->second);
3184 
3185  return false;
3186 }
3187 
3188 /// parseDirectiveValue
3189 /// ::= (.byte | .short | ... ) [ expression (, expression)* ]
3190 bool AsmParser::parseDirectiveValue(StringRef IDVal, unsigned Size) {
3191  auto parseOp = [&]() -> bool {
3192  const MCExpr *Value;
3193  SMLoc ExprLoc = getLexer().getLoc();
3194  if (checkForValidSection() || parseExpression(Value))
3195  return true;
3196  // Special case constant expressions to match code generator.
3197  if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
3198  assert(Size <= 8 && "Invalid size");
3199  uint64_t IntValue = MCE->getValue();
3200  if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
3201  return Error(ExprLoc, "out of range literal value");
3202  getStreamer().emitIntValue(IntValue, Size);
3203  } else
3204  getStreamer().emitValue(Value, Size, ExprLoc);
3205  return false;
3206  };
3207 
3208  return parseMany(parseOp);
3209 }
3210 
3211 static bool parseHexOcta(AsmParser &Asm, uint64_t &hi, uint64_t &lo) {
3212  if (Asm.getTok().isNot(AsmToken::Integer) &&
3213  Asm.getTok().isNot(AsmToken::BigNum))
3214  return Asm.TokError("unknown token in expression");
3215  SMLoc ExprLoc = Asm.getTok().getLoc();
3216  APInt IntValue = Asm.getTok().getAPIntVal();
3217  Asm.Lex();
3218  if (!IntValue.isIntN(128))
3219  return Asm.Error(ExprLoc, "out of range literal value");
3220  if (!IntValue.isIntN(64)) {
3221  hi = IntValue.getHiBits(IntValue.getBitWidth() - 64).getZExtValue();
3222  lo = IntValue.getLoBits(64).getZExtValue();
3223  } else {
3224  hi = 0;
3225  lo = IntValue.getZExtValue();
3226  }
3227  return false;
3228 }
3229 
3230 /// ParseDirectiveOctaValue
3231 /// ::= .octa [ hexconstant (, hexconstant)* ]
3232 
3233 bool AsmParser::parseDirectiveOctaValue(StringRef IDVal) {
3234  auto parseOp = [&]() -> bool {
3235  if (checkForValidSection())
3236  return true;
3237  uint64_t hi, lo;
3238  if (parseHexOcta(*this, hi, lo))
3239  return true;
3240  if (MAI.isLittleEndian()) {
3241  getStreamer().emitInt64(lo);
3242  getStreamer().emitInt64(hi);
3243  } else {
3244  getStreamer().emitInt64(hi);
3245  getStreamer().emitInt64(lo);
3246  }
3247  return false;
3248  };
3249 
3250  return parseMany(parseOp);
3251 }
3252 
3253 bool AsmParser::parseRealValue(const fltSemantics &Semantics, APInt &Res) {
3254  // We don't truly support arithmetic on floating point expressions, so we
3255  // have to manually parse unary prefixes.
3256  bool IsNeg = false;
3257  if (getLexer().is(AsmToken::Minus)) {
3258  Lexer.Lex();
3259  IsNeg = true;
3260  } else if (getLexer().is(AsmToken::Plus))
3261  Lexer.Lex();
3262 
3263  if (Lexer.is(AsmToken::Error))
3264  return TokError(Lexer.getErr());
3265  if (Lexer.isNot(AsmToken::Integer) && Lexer.isNot(AsmToken::Real) &&
3266  Lexer.isNot(AsmToken::Identifier))
3267  return TokError("unexpected token in directive");
3268 
3269  // Convert to an APFloat.
3270  APFloat Value(Semantics);
3271  StringRef IDVal = getTok().getString();
3272  if (getLexer().is(AsmToken::Identifier)) {
3273  if (!IDVal.compare_insensitive("infinity") ||
3274  !IDVal.compare_insensitive("inf"))
3275  Value = APFloat::getInf(Semantics);
3276  else if (!IDVal.compare_insensitive("nan"))
3277  Value = APFloat::getNaN(Semantics, false, ~0);
3278  else
3279  return TokError("invalid floating point literal");
3280  } else if (errorToBool(
3281  Value.convertFromString(IDVal, APFloat::rmNearestTiesToEven)
3282  .takeError()))
3283  return TokError("invalid floating point literal");
3284  if (IsNeg)
3285  Value.changeSign();
3286 
3287  // Consume the numeric token.
3288  Lex();
3289 
3290  Res = Value.bitcastToAPInt();
3291 
3292  return false;
3293 }
3294 
3295 /// parseDirectiveRealValue
3296 /// ::= (.single | .double) [ expression (, expression)* ]
3297 bool AsmParser::parseDirectiveRealValue(StringRef IDVal,
3298  const fltSemantics &Semantics) {
3299  auto parseOp = [&]() -> bool {
3300  APInt AsInt;
3301  if (checkForValidSection() || parseRealValue(Semantics, AsInt))
3302  return true;
3303  getStreamer().emitIntValue(AsInt.getLimitedValue(),
3304  AsInt.getBitWidth() / 8);
3305  return false;
3306  };
3307 
3308  return parseMany(parseOp);
3309 }
3310 
3311 /// parseDirectiveZero
3312 /// ::= .zero expression
3313 bool AsmParser::parseDirectiveZero() {
3314  SMLoc NumBytesLoc = Lexer.getLoc();
3315  const MCExpr *NumBytes;
3316  if (checkForValidSection() || parseExpression(NumBytes))
3317  return true;
3318 
3319  int64_t Val = 0;
3320  if (getLexer().is(AsmToken::Comma)) {
3321  Lex();
3322  if (parseAbsoluteExpression(Val))
3323  return true;
3324  }
3325 
3326  if (parseEOL())
3327  return true;
3328  getStreamer().emitFill(*NumBytes, Val, NumBytesLoc);
3329 
3330  return false;
3331 }
3332 
3333 /// parseDirectiveFill
3334 /// ::= .fill expression [ , expression [ , expression ] ]
3335 bool AsmParser::parseDirectiveFill() {
3336  SMLoc NumValuesLoc = Lexer.getLoc();
3337  const MCExpr *NumValues;
3338  if (checkForValidSection() || parseExpression(NumValues))
3339  return true;
3340 
3341  int64_t FillSize = 1;
3342  int64_t FillExpr = 0;
3343 
3344  SMLoc SizeLoc, ExprLoc;
3345 
3346  if (parseOptionalToken(AsmToken::Comma)) {
3347  SizeLoc = getTok().getLoc();
3348  if (parseAbsoluteExpression(FillSize))
3349  return true;
3350  if (parseOptionalToken(AsmToken::Comma)) {
3351  ExprLoc = getTok().getLoc();
3352  if (parseAbsoluteExpression(FillExpr))
3353  return true;
3354  }
3355  }
3356  if (parseEOL())
3357  return true;
3358 
3359  if (FillSize < 0) {
3360  Warning(SizeLoc, "'.fill' directive with negative size has no effect");
3361  return false;
3362  }
3363  if (FillSize > 8) {
3364  Warning(SizeLoc, "'.fill' directive with size greater than 8 has been truncated to 8");
3365  FillSize = 8;
3366  }
3367 
3368  if (!isUInt<32>(FillExpr) && FillSize > 4)
3369  Warning(ExprLoc, "'.fill' directive pattern has been truncated to 32-bits");
3370 
3371  getStreamer().emitFill(*NumValues, FillSize, FillExpr, NumValuesLoc);
3372 
3373  return false;
3374 }
3375 
3376 /// parseDirectiveOrg
3377 /// ::= .org expression [ , expression ]
3378 bool AsmParser::parseDirectiveOrg() {
3379  const MCExpr *Offset;
3380  SMLoc OffsetLoc = Lexer.getLoc();
3381  if (checkForValidSection() || parseExpression(Offset))
3382  return true;
3383 
3384  // Parse optional fill expression.
3385  int64_t FillExpr = 0;
3386  if (parseOptionalToken(AsmToken::Comma))
3387  if (parseAbsoluteExpression(FillExpr))
3388  return true;
3389  if (parseEOL())
3390  return true;
3391 
3392  getStreamer().emitValueToOffset(Offset, FillExpr, OffsetLoc);
3393  return false;
3394 }
3395 
3396 /// parseDirectiveAlign
3397 /// ::= {.align, ...} expression [ , expression [ , expression ]]
3398 bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
3399  SMLoc AlignmentLoc = getLexer().getLoc();
3400  int64_t Alignment;
3401  SMLoc MaxBytesLoc;
3402  bool HasFillExpr = false;
3403  int64_t FillExpr = 0;
3404  int64_t MaxBytesToFill = 0;
3405 
3406  auto parseAlign = [&]() -> bool {
3407  if (parseAbsoluteExpression(Alignment))
3408  return true;
3409  if (parseOptionalToken(AsmToken::Comma)) {
3410  // The fill expression can be omitted while specifying a maximum number of
3411  // alignment bytes, e.g:
3412  // .align 3,,4
3413  if (getTok().isNot(AsmToken::Comma)) {
3414  HasFillExpr = true;
3415  if (parseAbsoluteExpression(FillExpr))
3416  return true;
3417  }
3418  if (parseOptionalToken(AsmToken::Comma))
3419  if (parseTokenLoc(MaxBytesLoc) ||
3420  parseAbsoluteExpression(MaxBytesToFill))
3421  return true;
3422  }
3423  return parseEOL();
3424  };
3425 
3426  if (checkForValidSection())
3427  return true;
3428  // Ignore empty '.p2align' directives for GNU-as compatibility
3429  if (IsPow2 && (ValueSize == 1) && getTok().is(AsmToken::EndOfStatement)) {
3430  Warning(AlignmentLoc, "p2align directive with no operand(s) is ignored");
3431  return parseEOL();
3432  }
3433  if (parseAlign())
3434  return true;
3435 
3436  // Always emit an alignment here even if we thrown an error.
3437  bool ReturnVal = false;
3438 
3439  // Compute alignment in bytes.
3440  if (IsPow2) {
3441  // FIXME: Diagnose overflow.
3442  if (Alignment >= 32) {
3443  ReturnVal |= Error(AlignmentLoc, "invalid alignment value");
3444  Alignment = 31;
3445  }
3446 
3447  Alignment = 1ULL << Alignment;
3448  } else {
3449  // Reject alignments that aren't either a power of two or zero,
3450  // for gas compatibility. Alignment of zero is silently rounded
3451  // up to one.
3452  if (Alignment == 0)
3453  Alignment = 1;
3454  if (!isPowerOf2_64(Alignment))
3455  ReturnVal |= Error(AlignmentLoc, "alignment must be a power of 2");
3456  if (!isUInt<32>(Alignment))
3457  ReturnVal |= Error(AlignmentLoc, "alignment must be smaller than 2**32");
3458  }
3459 
3460  // Diagnose non-sensical max bytes to align.
3461  if (MaxBytesLoc.isValid()) {
3462  if (MaxBytesToFill < 1) {
3463  ReturnVal |= Error(MaxBytesLoc,
3464  "alignment directive can never be satisfied in this "
3465  "many bytes, ignoring maximum bytes expression");
3466  MaxBytesToFill = 0;
3467  }
3468 
3469  if (MaxBytesToFill >= Alignment) {
3470  Warning(MaxBytesLoc, "maximum bytes expression exceeds alignment and "
3471  "has no effect");
3472  MaxBytesToFill = 0;
3473  }
3474  }
3475 
3476  // Check whether we should use optimal code alignment for this .align
3477  // directive.
3478  const MCSection *Section = getStreamer().getCurrentSectionOnly();
3479  assert(Section && "must have section to emit alignment");
3480  bool useCodeAlign = Section->useCodeAlign();
3481  if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
3482  ValueSize == 1 && useCodeAlign) {
3483  getStreamer().emitCodeAlignment(Alignment, &getTargetParser().getSTI(),
3484  MaxBytesToFill);
3485  } else {
3486  // FIXME: Target specific behavior about how the "extra" bytes are filled.
3487  getStreamer().emitValueToAlignment(Alignment, FillExpr, ValueSize,
3488  MaxBytesToFill);
3489  }
3490 
3491  return ReturnVal;
3492 }
3493 
3494 /// parseDirectiveFile
3495 /// ::= .file filename
3496 /// ::= .file number [directory] filename [md5 checksum] [source source-text]
3497 bool AsmParser::parseDirectiveFile(SMLoc DirectiveLoc) {
3498  // FIXME: I'm not sure what this is.
3499  int64_t FileNumber = -1;
3500  if (getLexer().is(AsmToken::Integer)) {
3501  FileNumber = getTok().getIntVal();
3502  Lex();
3503 
3504  if (FileNumber < 0)
3505  return TokError("negative file number");
3506  }
3507 
3508  std::string Path;
3509 
3510  // Usually the directory and filename together, otherwise just the directory.
3511  // Allow the strings to have escaped octal character sequence.
3512  if (parseEscapedString(Path))
3513  return true;
3514 
3515  StringRef Directory;
3516  StringRef Filename;
3517  std::string FilenameData;
3518  if (getLexer().is(AsmToken::String)) {
3519  if (check(FileNumber == -1,
3520  "explicit path specified, but no file number") ||
3521  parseEscapedString(FilenameData))
3522  return true;
3523  Filename = FilenameData;
3524  Directory = Path;
3525  } else {
3526  Filename = Path;
3527  }
3528 
3529  uint64_t MD5Hi, MD5Lo;
3530  bool HasMD5 = false;
3531 
3533  bool HasSource = false;
3534  std::string SourceString;
3535 
3536  while (!parseOptionalToken(AsmToken::EndOfStatement)) {
3538  if (check(getTok().isNot(AsmToken::Identifier),
3539  "unexpected token in '.file' directive") ||
3540  parseIdentifier(Keyword))
3541  return true;
3542  if (Keyword == "md5") {
3543  HasMD5 = true;
3544  if (check(FileNumber == -1,
3545  "MD5 checksum specified, but no file number") ||
3546  parseHexOcta(*this, MD5Hi, MD5Lo))
3547  return true;
3548  } else if (Keyword == "source") {
3549  HasSource = true;
3550  if (check(FileNumber == -1,
3551  "source specified, but no file number") ||
3552  check(getTok().isNot(AsmToken::String),
3553  "unexpected token in '.file' directive") ||
3554  parseEscapedString(SourceString))
3555  return true;
3556  } else {
3557  return TokError("unexpected token in '.file' directive");
3558  }
3559  }
3560 
3561  if (FileNumber == -1) {
3562  // Ignore the directive if there is no number and the target doesn't support
3563  // numberless .file directives. This allows some portability of assembler
3564  // between different object file formats.
3565  if (getContext().getAsmInfo()->hasSingleParameterDotFile())
3566  getStreamer().emitFileDirective(Filename);
3567  } else {
3568  // In case there is a -g option as well as debug info from directive .file,
3569  // we turn off the -g option, directly use the existing debug info instead.
3570  // Throw away any implicit file table for the assembler source.
3571  if (Ctx.getGenDwarfForAssembly()) {
3573  Ctx.setGenDwarfForAssembly(false);
3574  }
3575 
3577  if (HasMD5) {
3578  MD5::MD5Result Sum;
3579  for (unsigned i = 0; i != 8; ++i) {
3580  Sum[i] = uint8_t(MD5Hi >> ((7 - i) * 8));
3581  Sum[i + 8] = uint8_t(MD5Lo >> ((7 - i) * 8));
3582  }
3583  CKMem = Sum;
3584  }
3585  if (HasSource) {
3586  char *SourceBuf = static_cast<char *>(Ctx.allocate(SourceString.size()));
3587  memcpy(SourceBuf, SourceString.data(), SourceString.size());
3588  Source = StringRef(SourceBuf, SourceString.size());
3589  }
3590  if (FileNumber == 0) {
3591  // Upgrade to Version 5 for assembly actions like clang -c a.s.
3592  if (Ctx.getDwarfVersion() < 5)
3593  Ctx.setDwarfVersion(5);
3594  getStreamer().emitDwarfFile0Directive(Directory, Filename, CKMem, Source);
3595  } else {
3596  Expected<unsigned> FileNumOrErr = getStreamer().tryEmitDwarfFileDirective(
3597  FileNumber, Directory, Filename, CKMem, Source);
3598  if (!FileNumOrErr)
3599  return Error(DirectiveLoc, toString(FileNumOrErr.takeError()));
3600  }
3601  // Alert the user if there are some .file directives with MD5 and some not.
3602  // But only do that once.
3603  if (!ReportedInconsistentMD5 && !Ctx.isDwarfMD5UsageConsistent(0)) {
3604  ReportedInconsistentMD5 = true;
3605  return Warning(DirectiveLoc, "inconsistent use of MD5 checksums");
3606  }
3607  }
3608 
3609  return false;
3610 }
3611 
3612 /// parseDirectiveLine
3613 /// ::= .line [number]
3614 bool AsmParser::parseDirectiveLine() {
3615  int64_t LineNumber;
3616  if (getLexer().is(AsmToken::Integer)) {
3617  if (parseIntToken(LineNumber, "unexpected token in '.line' directive"))
3618  return true;
3619  (void)LineNumber;
3620  // FIXME: Do something with the .line.
3621  }
3622  return parseEOL();
3623 }
3624 
3625 /// parseDirectiveLoc
3626 /// ::= .loc FileNumber [LineNumber] [ColumnPos] [basic_block] [prologue_end]
3627 /// [epilogue_begin] [is_stmt VALUE] [isa VALUE]
3628 /// The first number is a file number, must have been previously assigned with
3629 /// a .file directive, the second number is the line number and optionally the
3630 /// third number is a column position (zero if not specified). The remaining
3631 /// optional items are .loc sub-directives.
3632 bool AsmParser::parseDirectiveLoc() {
3633  int64_t FileNumber = 0, LineNumber = 0;
3634  SMLoc Loc = getTok().getLoc();
3635  if (parseIntToken(FileNumber, "unexpected token in '.loc' directive") ||
3636  check(FileNumber < 1 && Ctx.getDwarfVersion() < 5, Loc,
3637  "file number less than one in '.loc' directive") ||
3638  check(!getContext().isValidDwarfFileNumber(FileNumber), Loc,
3639  "unassigned file number in '.loc' directive"))
3640  return true;
3641 
3642  // optional
3643  if (getLexer().is(AsmToken::Integer)) {
3644  LineNumber = getTok().getIntVal();
3645  if (LineNumber < 0)
3646  return TokError("line number less than zero in '.loc' directive");
3647  Lex();
3648  }
3649 
3650  int64_t ColumnPos = 0;
3651  if (getLexer().is(AsmToken::Integer)) {
3652  ColumnPos = getTok().getIntVal();
3653  if (ColumnPos < 0)
3654  return TokError("column position less than zero in '.loc' directive");
3655  Lex();
3656  }
3657 
3658  auto PrevFlags = getContext().getCurrentDwarfLoc().getFlags();
3659  unsigned Flags = PrevFlags & DWARF2_FLAG_IS_STMT;
3660  unsigned Isa = 0;
3661  int64_t Discriminator = 0;
3662 
3663  auto parseLocOp = [&]() -> bool {
3664  StringRef Name;
3665  SMLoc Loc = getTok().getLoc();
3666  if (parseIdentifier(Name))
3667  return TokError("unexpected token in '.loc' directive");
3668 
3669  if (Name == "basic_block")
3670  Flags |= DWARF2_FLAG_BASIC_BLOCK;
3671  else if (Name == "prologue_end")
3672  Flags |= DWARF2_FLAG_PROLOGUE_END;
3673  else if (Name == "epilogue_begin")
3674  Flags |= DWARF2_FLAG_EPILOGUE_BEGIN;
3675  else if (Name == "is_stmt") {
3676  Loc = getTok().getLoc();
3677  const MCExpr *Value;
3678  if (parseExpression(Value))
3679  return true;
3680  // The expression must be the constant 0 or 1.
3681  if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
3682  int Value = MCE->getValue();
3683  if (Value == 0)
3684  Flags &= ~DWARF2_FLAG_IS_STMT;
3685  else if (Value == 1)
3686  Flags |= DWARF2_FLAG_IS_STMT;
3687  else
3688  return Error(Loc, "is_stmt value not 0 or 1");
3689  } else {
3690  return Error(Loc, "is_stmt value not the constant value of 0 or 1");
3691  }
3692  } else if (Name == "isa") {
3693  Loc = getTok().getLoc();
3694  const MCExpr *Value;
3695  if (parseExpression(Value))
3696  return true;
3697  // The expression must be a constant greater or equal to 0.
3698  if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
3699  int Value = MCE->getValue();
3700  if (Value < 0)
3701  return Error(Loc, "isa number less than zero");
3702  Isa = Value;
3703  } else {
3704  return Error(Loc, "isa number not a constant value");
3705  }
3706  } else if (Name == "discriminator") {
3707  if (parseAbsoluteExpression(Discriminator))
3708  return true;
3709  } else {
3710  return Error(Loc, "unknown sub-directive in '.loc' directive");
3711  }
3712  return false;
3713  };
3714 
3715  if (parseMany(parseLocOp, false /*hasComma*/))
3716  return true;
3717 
3718  getStreamer().emitDwarfLocDirective(FileNumber, LineNumber, ColumnPos, Flags,
3719  Isa, Discriminator, StringRef());
3720 
3721  return false;
3722 }
3723 
3724 /// parseDirectiveStabs
3725 /// ::= .stabs string, number, number, number
3726 bool AsmParser::parseDirectiveStabs() {
3727  return TokError("unsupported directive '.stabs'");
3728 }
3729 
3730 /// parseDirectiveCVFile
3731 /// ::= .cv_file number filename [checksum] [checksumkind]
3732 bool AsmParser::parseDirectiveCVFile() {
3733  SMLoc FileNumberLoc = getTok().getLoc();
3734  int64_t FileNumber;
3735  std::string Filename;
3736  std::string Checksum;
3737  int64_t ChecksumKind = 0;
3738 
3739  if (parseIntToken(FileNumber,
3740  "expected file number in '.cv_file' directive") ||
3741  check(FileNumber < 1, FileNumberLoc, "file number less than one") ||
3742  check(getTok().isNot(AsmToken::String),
3743  "unexpected token in '.cv_file' directive") ||
3744  parseEscapedString(Filename))
3745  return true;
3746  if (!parseOptionalToken(AsmToken::EndOfStatement)) {
3747  if (check(getTok().isNot(AsmToken::String),
3748  "unexpected token in '.cv_file' directive") ||
3749  parseEscapedString(Checksum) ||
3750  parseIntToken(ChecksumKind,
3751  "expected checksum kind in '.cv_file' directive") ||
3752  parseToken(AsmToken::EndOfStatement,
3753  "unexpected token in '.cv_file' directive"))
3754  return true;
3755  }
3756 
3757  Checksum = fromHex(Checksum);
3758  void *CKMem = Ctx.allocate(Checksum.size(), 1);
3759  memcpy(CKMem, Checksum.data(), Checksum.size());
3760  ArrayRef<uint8_t> ChecksumAsBytes(reinterpret_cast<const uint8_t *>(CKMem),
3761  Checksum.size());
3762 
3763  if (!getStreamer().EmitCVFileDirective(FileNumber, Filename, ChecksumAsBytes,
3764  static_cast<uint8_t>(ChecksumKind)))
3765  return Error(FileNumberLoc, "file number already allocated");
3766 
3767  return false;
3768 }
3769 
3770 bool AsmParser::parseCVFunctionId(int64_t &FunctionId,
3771  StringRef DirectiveName) {
3772  SMLoc Loc;
3773  return parseTokenLoc(Loc) ||
3774  parseIntToken(FunctionId, "expected function id in '" + DirectiveName +
3775  "' directive") ||
3776  check(FunctionId < 0 || FunctionId >= UINT_MAX, Loc,
3777  "expected function id within range [0, UINT_MAX)");
3778 }
3779 
3780 bool AsmParser::parseCVFileId(int64_t &FileNumber, StringRef DirectiveName) {
3781  SMLoc Loc;
3782  return parseTokenLoc(Loc) ||
3783  parseIntToken(FileNumber, "expected integer in '" + DirectiveName +
3784  "' directive") ||
3785  check(FileNumber < 1, Loc, "file number less than one in '" +
3786  DirectiveName + "' directive") ||
3787  check(!getCVContext().isValidFileNumber(FileNumber), Loc,
3788  "unassigned file number in '" + DirectiveName + "' directive");
3789 }
3790 
3791 /// parseDirectiveCVFuncId
3792 /// ::= .cv_func_id FunctionId
3793 ///
3794 /// Introduces a function ID that can be used with .cv_loc.
3795 bool AsmParser::parseDirectiveCVFuncId() {
3796  SMLoc FunctionIdLoc = getTok().getLoc();
3797  int64_t FunctionId;
3798 
3799  if (parseCVFunctionId(FunctionId, ".cv_func_id") ||
3800  parseToken(AsmToken::EndOfStatement,
3801  "unexpected token in '.cv_func_id' directive"))
3802  return true;
3803 
3804  if (!getStreamer().EmitCVFuncIdDirective(FunctionId))
3805  return Error(FunctionIdLoc, "function id already allocated");
3806 
3807  return false;
3808 }
3809 
3810 /// parseDirectiveCVInlineSiteId
3811 /// ::= .cv_inline_site_id FunctionId
3812 /// "within" IAFunc
3813 /// "inlined_at" IAFile IALine [IACol]
3814 ///
3815 /// Introduces a function ID that can be used with .cv_loc. Includes "inlined
3816 /// at" source location information for use in the line table of the caller,
3817 /// whether the caller is a real function or another inlined call site.
3818 bool AsmParser::parseDirectiveCVInlineSiteId() {
3819  SMLoc FunctionIdLoc = getTok().getLoc();
3820  int64_t FunctionId;
3821  int64_t IAFunc;
3822  int64_t IAFile;
3823  int64_t IALine;
3824  int64_t IACol = 0;
3825 
3826  // FunctionId
3827  if (parseCVFunctionId(FunctionId, ".cv_inline_site_id"))
3828  return true;
3829 
3830  // "within"
3831  if (check((getLexer().isNot(AsmToken::Identifier) ||
3832  getTok().getIdentifier() != "within"),
3833  "expected 'within' identifier in '.cv_inline_site_id' directive"))
3834  return true;
3835  Lex();
3836 
3837  // IAFunc
3838  if (parseCVFunctionId(IAFunc, ".cv_inline_site_id"))
3839  return true;
3840 
3841  // "inlined_at"
3842  if (check((getLexer().isNot(AsmToken::Identifier) ||
3843  getTok().getIdentifier() != "inlined_at"),
3844  "expected 'inlined_at' identifier in '.cv_inline_site_id' "
3845  "directive") )
3846  return true;
3847  Lex();
3848 
3849  // IAFile IALine
3850  if (parseCVFileId(IAFile, ".cv_inline_site_id") ||
3851  parseIntToken(IALine, "expected line number after 'inlined_at'"))
3852  return true;
3853 
3854  // [IACol]
3855  if (getLexer().is(AsmToken::Integer)) {
3856  IACol = getTok().getIntVal();
3857  Lex();
3858  }
3859 
3860  if (parseToken(AsmToken::EndOfStatement,
3861  "unexpected token in '.cv_inline_site_id' directive"))
3862  return true;
3863 
3864  if (!getStreamer().EmitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile,
3865  IALine, IACol, FunctionIdLoc))
3866  return Error(FunctionIdLoc, "function id already allocated");
3867 
3868  return false;
3869 }
3870 
3871 /// parseDirectiveCVLoc
3872 /// ::= .cv_loc FunctionId FileNumber [LineNumber] [ColumnPos] [prologue_end]
3873 /// [is_stmt VALUE]
3874 /// The first number is a file number, must have been previously assigned with
3875 /// a .file directive, the second number is the line number and optionally the
3876 /// third number is a column position (zero if not specified). The remaining
3877 /// optional items are .loc sub-directives.
3878 bool AsmParser::parseDirectiveCVLoc() {
3879  SMLoc DirectiveLoc = getTok().getLoc();
3880  int64_t FunctionId, FileNumber;
3881  if (parseCVFunctionId(FunctionId, ".cv_loc") ||
3882  parseCVFileId(FileNumber, ".cv_loc"))
3883  return true;
3884 
3885  int64_t LineNumber = 0;
3886  if (getLexer().is(AsmToken::Integer)) {
3887  LineNumber = getTok().getIntVal();
3888  if (LineNumber < 0)
3889  return TokError("line number less than zero in '.cv_loc' directive");
3890  Lex();
3891  }
3892 
3893  int64_t ColumnPos = 0;
3894  if (getLexer().is(AsmToken::Integer)) {
3895  ColumnPos = getTok().getIntVal();
3896  if (ColumnPos < 0)
3897  return TokError("column position less than zero in '.cv_loc' directive");
3898  Lex();
3899  }
3900 
3901  bool PrologueEnd = false;
3902  uint64_t IsStmt = 0;
3903 
3904  auto parseOp = [&]() -> bool {
3905  StringRef Name;
3906  SMLoc Loc = getTok().getLoc();
3907  if (parseIdentifier(Name))
3908  return TokError("unexpected token in '.cv_loc' directive");
3909  if (Name == "prologue_end")
3910  PrologueEnd = true;
3911  else if (Name == "is_stmt") {
3912  Loc = getTok().getLoc();
3913  const MCExpr *Value;
3914  if (parseExpression(Value))
3915  return true;
3916  // The expression must be the constant 0 or 1.
3917  IsStmt = ~0ULL;
3918  if (const auto *MCE = dyn_cast<MCConstantExpr>(Value))
3919  IsStmt = MCE->getValue();
3920 
3921  if (IsStmt > 1)
3922  return Error(Loc, "is_stmt value not 0 or 1");
3923  } else {
3924  return Error(Loc, "unknown sub-directive in '.cv_loc' directive");
3925  }
3926  return false;
3927  };
3928 
3929  if (parseMany(parseOp, false /*hasComma*/))
3930  return true;
3931 
3932  getStreamer().emitCVLocDirective(FunctionId, FileNumber, LineNumber,
3933  ColumnPos, PrologueEnd, IsStmt, StringRef(),
3934  DirectiveLoc);
3935  return false;
3936 }
3937 
3938 /// parseDirectiveCVLinetable
3939 /// ::= .cv_linetable FunctionId, FnStart, FnEnd
3940 bool AsmParser::parseDirectiveCVLinetable() {
3941  int64_t FunctionId;
3942  StringRef FnStartName, FnEndName;
3943  SMLoc Loc = getTok().getLoc();
3944  if (parseCVFunctionId(FunctionId, ".cv_linetable") || parseComma() ||
3945  parseTokenLoc(Loc) ||
3946  check(parseIdentifier(FnStartName), Loc,
3947  "expected identifier in directive") ||
3948  parseComma() || parseTokenLoc(Loc) ||
3949  check(parseIdentifier(FnEndName), Loc,
3950  "expected identifier in directive"))
3951  return true;
3952 
3953  MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName);
3954  MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName);
3955 
3956  getStreamer().emitCVLinetableDirective(FunctionId, FnStartSym, FnEndSym);
3957  return false;
3958 }
3959 
3960 /// parseDirectiveCVInlineLinetable
3961 /// ::= .cv_inline_linetable PrimaryFunctionId FileId LineNum FnStart FnEnd
3962 bool AsmParser::parseDirectiveCVInlineLinetable() {
3963  int64_t PrimaryFunctionId, SourceFileId, SourceLineNum;
3964  StringRef FnStartName, FnEndName;
3965  SMLoc Loc = getTok().getLoc();
3966  if (parseCVFunctionId(PrimaryFunctionId, ".cv_inline_linetable") ||
3967  parseTokenLoc(Loc) ||
3968  parseIntToken(
3969  SourceFileId,
3970  "expected SourceField in '.cv_inline_linetable' directive") ||
3971  check(SourceFileId <= 0, Loc,
3972  "File id less than zero in '.cv_inline_linetable' directive") ||
3973  parseTokenLoc(Loc) ||
3974  parseIntToken(
3975  SourceLineNum,
3976  "expected SourceLineNum in '.cv_inline_linetable' directive") ||
3977  check(SourceLineNum < 0, Loc,
3978  "Line number less than zero in '.cv_inline_linetable' directive") ||
3979  parseTokenLoc(Loc) || check(parseIdentifier(FnStartName), Loc,
3980  "expected identifier in directive") ||
3981  parseTokenLoc(Loc) || check(parseIdentifier(FnEndName), Loc,
3982  "expected identifier in directive"))
3983  return true;
3984 
3985  if (parseToken(AsmToken::EndOfStatement, "Expected End of Statement"))
3986  return true;
3987 
3988  MCSymbol *FnStartSym = getContext().getOrCreateSymbol(FnStartName);
3989  MCSymbol *FnEndSym = getContext().getOrCreateSymbol(FnEndName);
3990  getStreamer().emitCVInlineLinetableDirective(PrimaryFunctionId, SourceFileId,
3991  SourceLineNum, FnStartSym,
3992  FnEndSym);
3993  return false;
3994 }
3995 
3996 void AsmParser::initializeCVDefRangeTypeMap() {
3997  CVDefRangeTypeMap["reg"] = CVDR_DEFRANGE_REGISTER;
3998  CVDefRangeTypeMap["frame_ptr_rel"] = CVDR_DEFRANGE_FRAMEPOINTER_REL;
3999  CVDefRangeTypeMap["subfield_reg"] = CVDR_DEFRANGE_SUBFIELD_REGISTER;
4000  CVDefRangeTypeMap["reg_rel"] = CVDR_DEFRANGE_REGISTER_REL;
4001 }
4002 
4003 /// parseDirectiveCVDefRange
4004 /// ::= .cv_def_range RangeStart RangeEnd (GapStart GapEnd)*, bytes*
4005 bool AsmParser::parseDirectiveCVDefRange() {
4006  SMLoc Loc;
4007  std::vector<std::pair<const MCSymbol *, const MCSymbol *>> Ranges;
4008  while (getLexer().is(AsmToken::Identifier)) {
4009  Loc = getLexer().getLoc();
4010  StringRef GapStartName;
4011  if (parseIdentifier(GapStartName))
4012  return Error(Loc, "expected identifier in directive");
4013  MCSymbol *GapStartSym = getContext().getOrCreateSymbol(GapStartName);
4014 
4015  Loc = getLexer().getLoc();
4016  StringRef GapEndName;
4017  if (parseIdentifier(GapEndName))
4018  return Error(Loc, "expected identifier in directive");
4019  MCSymbol *GapEndSym = getContext().getOrCreateSymbol(GapEndName);
4020 
4021  Ranges.push_back({GapStartSym, GapEndSym});
4022  }
4023 
4024  StringRef CVDefRangeTypeStr;
4025  if (parseToken(
4027  "expected comma before def_range type in .cv_def_range directive") ||
4028  parseIdentifier(CVDefRangeTypeStr))
4029  return Error(Loc, "expected def_range type in directive");
4030 
4032  CVDefRangeTypeMap.find(CVDefRangeTypeStr);
4033  CVDefRangeType CVDRType = (CVTypeIt == CVDefRangeTypeMap.end())
4034  ? CVDR_DEFRANGE
4035  : CVTypeIt->getValue();
4036  switch (CVDRType) {
4037  case CVDR_DEFRANGE_REGISTER: {
4038  int64_t DRRegister;
4039  if (parseToken(AsmToken::Comma, "expected comma before register number in "
4040  ".cv_def_range directive") ||
4041  parseAbsoluteExpression(DRRegister))
4042  return Error(Loc, "expected register number");
4043 
4045  DRHdr.Register = DRRegister;
4046  DRHdr.MayHaveNoName = 0;
4047  getStreamer().emitCVDefRangeDirective(Ranges, DRHdr);
4048  break;
4049  }
4050  case CVDR_DEFRANGE_FRAMEPOINTER_REL: {
4051  int64_t DROffset;
4052  if (parseToken(AsmToken::Comma,
4053  "expected comma before offset in .cv_def_range directive") ||
4054  parseAbsoluteExpression(DROffset))
4055  return Error(Loc, "expected offset value");
4056 
4058  DRHdr.Offset = DROffset;
4059  getStreamer().emitCVDefRangeDirective(Ranges, DRHdr);
4060  break;
4061  }
4062  case CVDR_DEFRANGE_SUBFIELD_REGISTER: {
4063  int64_t DRRegister;
4064  int64_t DROffsetInParent;
4065  if (parseToken(AsmToken::Comma, "expected comma before register number in "
4066  ".cv_def_range directive") ||
4067  parseAbsoluteExpression(DRRegister))
4068  return Error(Loc, "expected register number");
4069  if (parseToken(AsmToken::Comma,
4070  "expected comma before offset in .cv_def_range directive") ||
4071  parseAbsoluteExpression(DROffsetInParent))
4072  return Error(Loc, "expected offset value");
4073 
4075  DRHdr.Register = DRRegister;
4076  DRHdr.MayHaveNoName = 0;
4077  DRHdr.OffsetInParent = DROffsetInParent;
4078  getStreamer().emitCVDefRangeDirective(Ranges, DRHdr);
4079  break;
4080  }
4081  case CVDR_DEFRANGE_REGISTER_REL: {
4082  int64_t DRRegister;
4083  int64_t DRFlags;
4084  int64_t DRBasePointerOffset;
4085  if (parseToken(AsmToken::Comma, "expected comma before register number in "
4086  ".cv_def_range directive") ||
4087  parseAbsoluteExpression(DRRegister))
4088  return Error(Loc, "expected register value");
4089  if (parseToken(
4091  "expected comma before flag value in .cv_def_range directive") ||
4092  parseAbsoluteExpression(DRFlags))
4093  return Error(Loc, "expected flag value");
4094  if (parseToken(AsmToken::Comma, "expected comma before base pointer offset "
4095  "in .cv_def_range directive") ||
4096  parseAbsoluteExpression(DRBasePointerOffset))
4097  return Error(Loc, "expected base pointer offset value");
4098 
4100  DRHdr.Register = DRRegister;
4101  DRHdr.Flags = DRFlags;
4102  DRHdr.BasePointerOffset = DRBasePointerOffset;
4103  getStreamer().emitCVDefRangeDirective(Ranges, DRHdr);
4104  break;
4105  }
4106  default:
4107  return Error(Loc, "unexpected def_range type in .cv_def_range directive");
4108  }
4109  return true;
4110 }
4111 
4112 /// parseDirectiveCVString
4113 /// ::= .cv_stringtable "string"
4114 bool AsmParser::parseDirectiveCVString() {
4115  std::string Data;
4116  if (checkForValidSection() || parseEscapedString(Data))
4117  return true;
4118 
4119  // Put the string in the table and emit the offset.
4120  std::pair<StringRef, unsigned> Insertion =
4121  getCVContext().addToStringTable(Data);
4122  getStreamer().emitInt32(Insertion.second);
4123  return false;
4124 }
4125 
4126 /// parseDirectiveCVStringTable
4127 /// ::= .cv_stringtable
4128 bool AsmParser::parseDirectiveCVStringTable() {
4129  getStreamer().emitCVStringTableDirective();
4130  return false;
4131 }
4132 
4133 /// parseDirectiveCVFileChecksums
4134 /// ::= .cv_filechecksums
4135 bool AsmParser::parseDirectiveCVFileChecksums() {
4136  getStreamer().emitCVFileChecksumsDirective();
4137  return false;
4138 }
4139 
4140 /// parseDirectiveCVFileChecksumOffset
4141 /// ::= .cv_filechecksumoffset fileno
4142 bool AsmParser::parseDirectiveCVFileChecksumOffset() {
4143  int64_t FileNo;
4144  if (parseIntToken(FileNo, "expected identifier in directive"))
4145  return true;
4146  if (parseToken(AsmToken::EndOfStatement, "Expected End of Statement"))
4147  return true;
4148  getStreamer().emitCVFileChecksumOffsetDirective(FileNo);
4149  return false;
4150 }
4151 
4152 /// parseDirectiveCVFPOData
4153 /// ::= .cv_fpo_data procsym
4154 bool AsmParser::parseDirectiveCVFPOData() {
4155  SMLoc DirLoc = getLexer().getLoc();
4156  StringRef ProcName;
4157  if (parseIdentifier(ProcName))
4158  return TokError("expected symbol name");
4159  if (parseEOL())
4160  return true;
4161  MCSymbol *ProcSym = getContext().getOrCreateSymbol(ProcName);
4162  getStreamer().EmitCVFPOData(ProcSym, DirLoc);
4163  return false;
4164 }
4165 
4166 /// parseDirectiveCFISections
4167 /// ::= .cfi_sections section [, section]
4168 bool AsmParser::parseDirectiveCFISections() {
4169  StringRef Name;
4170  bool EH = false;
4171  bool Debug = false;
4172 
4173  if (!parseOptionalToken(AsmToken::EndOfStatement)) {
4174  for (;;) {
4175  if (parseIdentifier(Name))
4176  return TokError("expected .eh_frame or .debug_frame");
4177  if (Name == ".eh_frame")
4178  EH = true;
4179  else if (Name == ".debug_frame")
4180  Debug = true;
4181  if (parseOptionalToken(AsmToken::EndOfStatement))
4182  break;
4183  if (parseComma())
4184  return true;
4185  }
4186  }
4187  getStreamer().emitCFISections(EH, Debug);
4188  return false;
4189 }
4190 
4191 /// parseDirectiveCFIStartProc
4192 /// ::= .cfi_startproc [simple]
4193 bool AsmParser::parseDirectiveCFIStartProc() {
4194  StringRef Simple;
4195  if (!parseOptionalToken(AsmToken::EndOfStatement)) {
4196  if (check(parseIdentifier(Simple) || Simple != "simple",
4197  "unexpected token") ||
4198  parseEOL())
4199  return true;
4200  }
4201 
4202  // TODO(kristina): Deal with a corner case of incorrect diagnostic context
4203  // being produced if this directive is emitted as part of preprocessor macro
4204  // expansion which can *ONLY* happen if Clang's cc1as is the API consumer.
4205  // Tools like llvm-mc on the other hand are not affected by it, and report
4206  // correct context information.
4207  getStreamer().emitCFIStartProc(!Simple.empty(), Lexer.getLoc());
4208  return false;
4209 }
4210 
4211 /// parseDirectiveCFIEndProc
4212 /// ::= .cfi_endproc
4213 bool AsmParser::parseDirectiveCFIEndProc() {
4214  if (parseEOL())
4215  return true;
4216  getStreamer().emitCFIEndProc();
4217  return false;
4218 }
4219 
4220 /// parse register name or number.
4221 bool AsmParser::parseRegisterOrRegisterNumber(int64_t &Register,
4222  SMLoc DirectiveLoc) {
4223  unsigned RegNo;
4224 
4225  if (getLexer().isNot(AsmToken::Integer)) {
4226  if (getTargetParser().ParseRegister(RegNo, DirectiveLoc, DirectiveLoc))
4227  return true;
4228  Register = getContext().getRegisterInfo()->getDwarfRegNum(RegNo, true);
4229  } else
4230  return parseAbsoluteExpression(Register);
4231 
4232  return false;
4233 }
4234 
4235 /// parseDirectiveCFIDefCfa
4236 /// ::= .cfi_def_cfa register, offset
4237 bool AsmParser::parseDirectiveCFIDefCfa(SMLoc DirectiveLoc) {
4238  int64_t Register = 0, Offset = 0;
4239  if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() ||
4240  parseAbsoluteExpression(Offset) || parseEOL())
4241  return true;
4242 
4243  getStreamer().emitCFIDefCfa(Register, Offset);
4244  return false;
4245 }
4246 
4247 /// parseDirectiveCFIDefCfaOffset
4248 /// ::= .cfi_def_cfa_offset offset
4249 bool AsmParser::parseDirectiveCFIDefCfaOffset() {
4250  int64_t Offset = 0;
4251  if (parseAbsoluteExpression(Offset) || parseEOL())
4252  return true;
4253 
4254  getStreamer().emitCFIDefCfaOffset(Offset);
4255  return false;
4256 }
4257 
4258 /// parseDirectiveCFIRegister
4259 /// ::= .cfi_register register, register
4260 bool AsmParser::parseDirectiveCFIRegister(SMLoc DirectiveLoc) {
4261  int64_t Register1 = 0, Register2 = 0;
4262  if (parseRegisterOrRegisterNumber(Register1, DirectiveLoc) || parseComma() ||
4263  parseRegisterOrRegisterNumber(Register2, DirectiveLoc) || parseEOL())
4264  return true;
4265 
4266  getStreamer().emitCFIRegister(Register1, Register2);
4267  return false;
4268 }
4269 
4270 /// parseDirectiveCFIWindowSave
4271 /// ::= .cfi_window_save
4272 bool AsmParser::parseDirectiveCFIWindowSave() {
4273  if (parseEOL())
4274  return true;
4275  getStreamer().emitCFIWindowSave();
4276  return false;
4277 }
4278 
4279 /// parseDirectiveCFIAdjustCfaOffset
4280 /// ::= .cfi_adjust_cfa_offset adjustment
4281 bool AsmParser::parseDirectiveCFIAdjustCfaOffset() {
4282  int64_t Adjustment = 0;
4283  if (parseAbsoluteExpression(Adjustment) || parseEOL())
4284  return true;
4285 
4286  getStreamer().emitCFIAdjustCfaOffset(Adjustment);
4287  return false;
4288 }
4289 
4290 /// parseDirectiveCFIDefCfaRegister
4291 /// ::= .cfi_def_cfa_register register
4292 bool AsmParser::parseDirectiveCFIDefCfaRegister(SMLoc DirectiveLoc) {
4293  int64_t Register = 0;
4294  if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
4295  return true;
4296 
4297  getStreamer().emitCFIDefCfaRegister(Register);
4298  return false;
4299 }
4300 
4301 /// parseDirectiveCFILLVMDefAspaceCfa
4302 /// ::= .cfi_llvm_def_aspace_cfa register, offset, address_space
4303 bool AsmParser::parseDirectiveCFILLVMDefAspaceCfa(SMLoc DirectiveLoc) {
4304  int64_t Register = 0, Offset = 0, AddressSpace = 0;
4305  if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() ||
4306  parseAbsoluteExpression(Offset) || parseComma() ||
4307  parseAbsoluteExpression(AddressSpace) || parseEOL())
4308  return true;
4309 
4310  getStreamer().emitCFILLVMDefAspaceCfa(Register, Offset, AddressSpace);
4311  return false;
4312 }
4313 
4314 /// parseDirectiveCFIOffset
4315 /// ::= .cfi_offset register, offset
4316 bool AsmParser::parseDirectiveCFIOffset(SMLoc DirectiveLoc) {
4317  int64_t Register = 0;
4318  int64_t Offset = 0;
4319 
4320  if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() ||
4321  parseAbsoluteExpression(Offset) || parseEOL())
4322  return true;
4323 
4324  getStreamer().emitCFIOffset(Register, Offset);
4325  return false;
4326 }
4327 
4328 /// parseDirectiveCFIRelOffset
4329 /// ::= .cfi_rel_offset register, offset
4330 bool AsmParser::parseDirectiveCFIRelOffset(SMLoc DirectiveLoc) {
4331  int64_t Register = 0, Offset = 0;
4332 
4333  if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseComma() ||
4334  parseAbsoluteExpression(Offset) || parseEOL())
4335  return true;
4336 
4337  getStreamer().emitCFIRelOffset(Register, Offset);
4338  return false;
4339 }
4340 
4341 static bool isValidEncoding(int64_t Encoding) {
4342  if (Encoding & ~0xff)
4343  return false;
4344 
4345  if (Encoding == dwarf::DW_EH_PE_omit)
4346  return true;
4347 
4348  const unsigned Format = Encoding & 0xf;
4353  return false;
4354 
4355  const unsigned Application = Encoding & 0x70;
4356  if (Application != dwarf::DW_EH_PE_absptr &&
4357  Application != dwarf::DW_EH_PE_pcrel)
4358  return false;
4359 
4360  return true;
4361 }
4362 
4363 /// parseDirectiveCFIPersonalityOrLsda
4364 /// IsPersonality true for cfi_personality, false for cfi_lsda
4365 /// ::= .cfi_personality encoding, [symbol_name]
4366 /// ::= .cfi_lsda encoding, [symbol_name]
4367 bool AsmParser::parseDirectiveCFIPersonalityOrLsda(bool IsPersonality) {
4368  int64_t Encoding = 0;
4369  if (parseAbsoluteExpression(Encoding))
4370  return true;
4371  if (Encoding == dwarf::DW_EH_PE_omit)
4372  return false;
4373 
4374  StringRef Name;
4375  if (check(!isValidEncoding(Encoding), "unsupported encoding.") ||
4376  parseComma() ||
4377  check(parseIdentifier(Name), "expected identifier in directive") ||
4378  parseEOL())
4379  return true;
4380 
4381  MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
4382 
4383  if (IsPersonality)
4384  getStreamer().emitCFIPersonality(Sym, Encoding);
4385  else
4386  getStreamer().emitCFILsda(Sym, Encoding);
4387  return false;
4388 }
4389 
4390 /// parseDirectiveCFIRememberState
4391 /// ::= .cfi_remember_state
4392 bool AsmParser::parseDirectiveCFIRememberState() {
4393  if (parseEOL())
4394  return true;
4395  getStreamer().emitCFIRememberState();
4396  return false;
4397 }
4398 
4399 /// parseDirectiveCFIRestoreState
4400 /// ::= .cfi_remember_state
4401 bool AsmParser::parseDirectiveCFIRestoreState() {
4402  if (parseEOL())
4403  return true;
4404  getStreamer().emitCFIRestoreState();
4405  return false;
4406 }
4407 
4408 /// parseDirectiveCFISameValue
4409 /// ::= .cfi_same_value register
4410 bool AsmParser::parseDirectiveCFISameValue(SMLoc DirectiveLoc) {
4411  int64_t Register = 0;
4412 
4413  if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
4414  return true;
4415 
4416  getStreamer().emitCFISameValue(Register);
4417  return false;
4418 }
4419 
4420 /// parseDirectiveCFIRestore
4421 /// ::= .cfi_restore register
4422 bool AsmParser::parseDirectiveCFIRestore(SMLoc DirectiveLoc) {
4423  int64_t Register = 0;
4424  if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
4425  return true;
4426 
4427  getStreamer().emitCFIRestore(Register);
4428  return false;
4429 }
4430 
4431 /// parseDirectiveCFIEscape
4432 /// ::= .cfi_escape expression[,...]
4433 bool AsmParser::parseDirectiveCFIEscape() {
4434  std::string Values;
4435  int64_t CurrValue;
4436  if (parseAbsoluteExpression(CurrValue))
4437  return true;
4438 
4439  Values.push_back((uint8_t)CurrValue);
4440 
4441  while (getLexer().is(AsmToken::Comma)) {
4442  Lex();
4443 
4444  if (parseAbsoluteExpression(CurrValue))
4445  return true;
4446 
4447  Values.push_back((uint8_t)CurrValue);
4448  }
4449 
4450  getStreamer().emitCFIEscape(Values);
4451  return false;
4452 }
4453 
4454 /// parseDirectiveCFIReturnColumn
4455 /// ::= .cfi_return_column register
4456 bool AsmParser::parseDirectiveCFIReturnColumn(SMLoc DirectiveLoc) {
4457  int64_t Register = 0;
4458  if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
4459  return true;
4460  getStreamer().emitCFIReturnColumn(Register);
4461  return false;
4462 }
4463 
4464 /// parseDirectiveCFISignalFrame
4465 /// ::= .cfi_signal_frame
4466 bool AsmParser::parseDirectiveCFISignalFrame() {
4467  if (parseEOL())
4468  return true;
4469 
4470  getStreamer().emitCFISignalFrame();
4471  return false;
4472 }
4473 
4474 /// parseDirectiveCFIUndefined
4475 /// ::= .cfi_undefined register
4476 bool AsmParser::parseDirectiveCFIUndefined(SMLoc DirectiveLoc) {
4477  int64_t Register = 0;
4478 
4479  if (parseRegisterOrRegisterNumber(Register, DirectiveLoc) || parseEOL())
4480  return true;
4481 
4482  getStreamer().emitCFIUndefined(Register);
4483  return false;
4484 }
4485 
4486 /// parseDirectiveAltmacro
4487 /// ::= .altmacro
4488 /// ::= .noaltmacro
4489 bool AsmParser::parseDirectiveAltmacro(StringRef Directive) {
4490  if (parseEOL())
4491  return true;
4492  AltMacroMode = (Directive == ".altmacro");
4493  return false;
4494 }
4495 
4496 /// parseDirectiveMacrosOnOff
4497 /// ::= .macros_on
4498 /// ::= .macros_off
4499 bool AsmParser::parseDirectiveMacrosOnOff(StringRef Directive) {
4500  if (parseEOL())
4501  return true;
4502  setMacrosEnabled(Directive == ".macros_on");
4503  return false;
4504 }
4505 
4506 /// parseDirectiveMacro
4507 /// ::= .macro name[,] [parameters]
4508 bool AsmParser::parseDirectiveMacro(SMLoc DirectiveLoc) {
4509  StringRef Name;
4510  if (parseIdentifier(Name))
4511  return TokError("expected identifier in '.macro' directive");
4512 
4513  if (getLexer().is(AsmToken::Comma))
4514  Lex();
4515 
4516  MCAsmMacroParameters Parameters;
4517  while (getLexer().isNot(AsmToken::EndOfStatement)) {
4518 
4519  if (!Parameters.empty() && Parameters.back().Vararg)
4520  return Error(Lexer.getLoc(), "vararg parameter '" +
4521  Parameters.back().Name +
4522  "' should be the last parameter");
4523 
4524  MCAsmMacroParameter Parameter;
4525  if (parseIdentifier(Parameter.Name))
4526  return TokError("expected identifier in '.macro' directive");
4527 
4528  // Emit an error if two (or more) named parameters share the same name
4529  for (const MCAsmMacroParameter& CurrParam : Parameters)
4530  if (CurrParam.Name.equals(Parameter.Name))
4531  return TokError("macro '" + Name + "' has multiple parameters"
4532  " named '" + Parameter.Name + "'");
4533 
4534  if (Lexer.is(AsmToken::Colon)) {
4535  Lex(); // consume ':'
4536 
4537  SMLoc QualLoc;
4538  StringRef Qualifier;
4539 
4540  QualLoc = Lexer.getLoc();
4541  if (parseIdentifier(Qualifier))
4542  return Error(QualLoc, "missing parameter qualifier for "
4543  "'" + Parameter.Name + "' in macro '" + Name + "'");
4544 
4545  if (Qualifier == "req")
4546  Parameter.Required = true;
4547  else if (Qualifier == "vararg")
4548  Parameter.Vararg = true;
4549  else
4550  return Error(QualLoc, Qualifier + " is not a valid parameter qualifier "
4551  "for '" + Parameter.Name + "' in macro '" + Name + "'");
4552  }
4553 
4554  if (getLexer().is(AsmToken::Equal)) {
4555  Lex();
4556 
4557  SMLoc ParamLoc;
4558 
4559  ParamLoc = Lexer.getLoc();
4560  if (parseMacroArgument(Parameter.Value, /*Vararg=*/false ))
4561  return true;
4562 
4563  if (Parameter.Required)
4564  Warning(ParamLoc, "pointless default value for required parameter "
4565  "'" + Parameter.Name + "' in macro '" + Name + "'");
4566  }
4567 
4568  Parameters.push_back(std::move(Parameter));
4569 
4570  if (getLexer().is(AsmToken::Comma))
4571  Lex();
4572  }
4573 
4574  // Eat just the end of statement.
4575  Lexer.Lex();
4576 
4577  // Consuming deferred text, so use Lexer.Lex to ignore Lexing Errors
4578  AsmToken EndToken, StartToken = getTok();
4579  unsigned MacroDepth = 0;
4580  // Lex the macro definition.
4581  while (true) {
4582  // Ignore Lexing errors in macros.
4583  while (Lexer.is(AsmToken::Error)) {
4584  Lexer.Lex();
4585  }
4586 
4587  // Check whether we have reached the end of the file.
4588  if (getLexer().is(AsmToken::Eof))
4589  return Error(DirectiveLoc, "no matching '.endmacro' in definition");
4590 
4591  // Otherwise, check whether we have reach the .endmacro or the start of a
4592  // preprocessor line marker.
4593  if (getLexer().is(AsmToken::Identifier)) {
4594  if (getTok().getIdentifier() == ".endm" ||
4595  getTok().getIdentifier() == ".endmacro") {
4596  if (MacroDepth == 0) { // Outermost macro.
4597  EndToken = getTok();
4598  Lexer.Lex();
4599  if (getLexer().isNot(AsmToken::EndOfStatement))
4600  return TokError("unexpected token in '" + EndToken.getIdentifier() +
4601  "' directive");
4602  break;
4603  } else {
4604  // Otherwise we just found the end of an inner macro.
4605  --MacroDepth;
4606  }
4607  } else if (getTok().getIdentifier() == ".macro") {
4608  // We allow nested macros. Those aren't instantiated until the outermost
4609  // macro is expanded so just ignore them for now.
4610  ++MacroDepth;
4611  }
4612  } else if (Lexer.is(AsmToken::HashDirective)) {
4613  (void)parseCppHashLineFilenameComment(getLexer().getLoc());
4614  }
4615 
4616  // Otherwise, scan til the end of the statement.
4617  eatToEndOfStatement();
4618  }
4619 
4620  if (getContext().lookupMacro(Name)) {
4621  return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
4622  }
4623 
4624  const char *BodyStart = StartToken.getLoc().getPointer();
4625  const char *BodyEnd = EndToken.getLoc().getPointer();
4626  StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
4627  checkForBadMacro(DirectiveLoc, Name, Body, Parameters);
4628  MCAsmMacro Macro(Name, Body, std::move(Parameters));
4629  DEBUG_WITH_TYPE("asm-macros", dbgs() << "Defining new macro:\n";
4630  Macro.dump());
4631  getContext().defineMacro(Name, std::move(Macro));
4632  return false;
4633 }
4634 
4635 /// checkForBadMacro
4636 ///
4637 /// With the support added for named parameters there may be code out there that
4638 /// is transitioning from positional parameters. In versions of gas that did
4639 /// not support named parameters they would be ignored on the macro definition.
4640 /// But to support both styles of parameters this is not possible so if a macro
4641 /// definition has named parameters but does not use them and has what appears
4642 /// to be positional parameters, strings like $1, $2, ... and $n, then issue a
4643 /// warning that the positional parameter found in body which have no effect.
4644 /// Hoping the developer will either remove the named parameters from the macro
4645 /// definition so the positional parameters get used if that was what was
4646 /// intended or change the macro to use the named parameters. It is possible
4647 /// this warning will trigger when the none of the named parameters are used
4648 /// and the strings like $1 are infact to simply to be passed trough unchanged.
4649 void AsmParser::checkForBadMacro(SMLoc DirectiveLoc, StringRef Name,
4650  StringRef Body,
4651  ArrayRef<MCAsmMacroParameter> Parameters) {
4652  // If this macro is not defined with named parameters the warning we are
4653  // checking for here doesn't apply.
4654  unsigned NParameters = Parameters.size();
4655  if (NParameters == 0)
4656  return;
4657 
4658  bool NamedParametersFound = false;
4659  bool PositionalParametersFound = false;
4660 
4661  // Look at the body of the macro for use of both the named parameters and what
4662  // are likely to be positional parameters. This is what expandMacro() is
4663  // doing when it finds the parameters in the body.
4664  while (!Body.empty()) {
4665  // Scan for the next possible parameter.
4666  std::size_t End = Body.size(), Pos = 0;
4667  for (; Pos != End; ++Pos) {
4668  // Check for a substitution or escape.
4669  // This macro is defined with parameters, look for \foo, \bar, etc.
4670  if (Body[Pos] == '\\' && Pos + 1 != End)
4671  break;
4672 
4673  // This macro should have parameters, but look for $0, $1, ..., $n too.
4674  if (Body[Pos] != '$' || Pos + 1 == End)
4675  continue;
4676  char Next = Body[Pos + 1];
4677  if (Next == '$' || Next == 'n' ||
4678  isdigit(static_cast<unsigned char>(Next)))
4679  break;
4680  }
4681 
4682  // Check if we reached the end.
4683  if (Pos == End)
4684  break;
4685 
4686  if (Body[Pos] == '$') {
4687  switch (Body[Pos + 1]) {
4688  // $$ => $
4689  case '$':
4690  break;
4691 
4692  // $n => number of arguments
4693  case 'n':
4694  PositionalParametersFound = true;
4695  break;
4696 
4697  // $[0-9] => argument
4698  default: {
4699  PositionalParametersFound = true;
4700  break;
4701  }
4702  }
4703  Pos += 2;
4704  } else {
4705  unsigned I = Pos + 1;
4706  while (isIdentifierChar(Body[I]) && I + 1 != End)
4707  ++I;
4708 
4709  const char *Begin = Body.data() + Pos + 1;
4710  StringRef Argument(Begin, I - (Pos + 1));
4711  unsigned Index = 0;
4712  for (; Index < NParameters; ++Index)
4713  if (Parameters[Index].Name == Argument)
4714  break;
4715 
4716  if (Index == NParameters) {
4717  if (Body[Pos + 1] == '(' && Body[Pos + 2] == ')')
4718  Pos += 3;
4719  else {
4720  Pos = I;
4721  }
4722  } else {
4723  NamedParametersFound = true;
4724  Pos += 1 + Argument.size();
4725  }
4726  }
4727  // Update the scan point.
4728  Body = Body.substr(Pos);
4729  }
4730 
4731  if (!NamedParametersFound && PositionalParametersFound)
4732  Warning(DirectiveLoc, "macro defined with named parameters which are not "
4733  "used in macro body, possible positional parameter "
4734  "found in body which will have no effect");
4735 }
4736 
4737 /// parseDirectiveExitMacro
4738 /// ::= .exitm
4739 bool AsmParser::parseDirectiveExitMacro(StringRef Directive) {
4740  if (parseEOL())
4741  return true;
4742 
4743  if (!isInsideMacroInstantiation())
4744  return TokError("unexpected '" + Directive + "' in file, "
4745  "no current macro definition");
4746 
4747  // Exit all conditionals that are active in the current macro.
4748  while (TheCondStack.size() != ActiveMacros.back()->CondStackDepth) {
4749  TheCondState = TheCondStack.back();
4750  TheCondStack.pop_back();
4751  }
4752 
4753  handleMacroExit();
4754  return false;
4755 }
4756 
4757 /// parseDirectiveEndMacro
4758 /// ::= .endm
4759 /// ::= .endmacro
4760 bool AsmParser::parseDirectiveEndMacro(StringRef Directive) {
4761  if (getLexer().isNot(AsmToken::EndOfStatement))
4762  return TokError("unexpected token in '" + Directive + "' directive");
4763 
4764  // If we are inside a macro instantiation, terminate the current
4765  // instantiation.
4766  if (isInsideMacroInstantiation()) {
4767  handleMacroExit();
4768  return false;
4769  }
4770 
4771  // Otherwise, this .endmacro is a stray entry in the file; well formed
4772  // .endmacro directives are handled during the macro definition parsing.
4773  return TokError("unexpected '" + Directive + "' in file, "
4774  "no current macro definition");
4775 }
4776 
4777 /// parseDirectivePurgeMacro
4778 /// ::= .purgem name
4779 bool AsmParser::parseDirectivePurgeMacro(SMLoc DirectiveLoc) {
4780  StringRef Name;
4781  SMLoc Loc;
4782  if (parseTokenLoc(Loc) ||
4783  check(parseIdentifier(Name), Loc,
4784  "expected identifier in '.purgem' directive") ||
4785  parseEOL())
4786  return true;
4787 
4788  if (!getContext().lookupMacro(Name))
4789  return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
4790 
4791  getContext().undefineMacro(Name);
4792  DEBUG_WITH_TYPE("asm-macros", dbgs()
4793  << "Un-defining macro: " << Name << "\n");
4794  return false;
4795 }
4796 
4797 /// parseDirectiveBundleAlignMode
4798 /// ::= {.bundle_align_mode} expression
4799 bool AsmParser::parseDirectiveBundleAlignMode() {
4800  // Expect a single argument: an expression that evaluates to a constant
4801  // in the inclusive range 0-30.
4802  SMLoc ExprLoc = getLexer().getLoc();
4803  int64_t AlignSizePow2;
4804  if (checkForValidSection() || parseAbsoluteExpression(AlignSizePow2) ||
4805  parseEOL() ||
4806  check(AlignSizePow2 < 0 || AlignSizePow2 > 30, ExprLoc,
4807  "invalid bundle alignment size (expected between 0 and 30)"))
4808  return true;
4809 
4810  // Because of AlignSizePow2's verified range we can safely truncate it to
4811  // unsigned.
4812  getStreamer().emitBundleAlignMode(static_cast<unsigned>(AlignSizePow2));
4813  return false;
4814 }
4815 
4816 /// parseDirectiveBundleLock
4817 /// ::= {.bundle_lock} [align_to_end]
4818 bool AsmParser::parseDirectiveBundleLock() {
4819  if (checkForValidSection())
4820  return true;
4821  bool AlignToEnd = false;
4822 
4823  StringRef Option;
4824  SMLoc Loc = getTok().getLoc();
4825  const char *kInvalidOptionError =
4826  "invalid option for '.bundle_lock' directive";
4827 
4828  if (!parseOptionalToken(AsmToken::EndOfStatement)) {
4829  if (check(parseIdentifier(Option), Loc, kInvalidOptionError) ||
4830  check(Option != "align_to_end", Loc, kInvalidOptionError) || parseEOL())
4831  return true;
4832  AlignToEnd = true;
4833  }
4834 
4835  getStreamer().emitBundleLock(AlignToEnd);
4836  return false;
4837 }
4838 
4839 /// parseDirectiveBundleLock
4840 /// ::= {.bundle_lock}
4841 bool AsmParser::parseDirectiveBundleUnlock() {
4842  if (checkForValidSection() || parseEOL())
4843  return true;
4844 
4845  getStreamer().emitBundleUnlock();
4846  return false;
4847 }
4848 
4849 /// parseDirectiveSpace
4850 /// ::= (.skip | .space) expression [ , expression ]
4851 bool AsmParser::parseDirectiveSpace(StringRef IDVal) {
4852  SMLoc NumBytesLoc = Lexer.getLoc();
4853  const MCExpr *NumBytes;
4854  if (checkForValidSection() || parseExpression(NumBytes))
4855  return true;
4856 
4857  int64_t FillExpr = 0;
4858  if (parseOptionalToken(AsmToken::Comma))
4859  if (parseAbsoluteExpression(FillExpr))
4860  return true;
4861  if (parseEOL())
4862  return true;
4863 
4864  // FIXME: Sometimes the fill expr is 'nop' if it isn't supplied, instead of 0.
4865  getStreamer().emitFill(*NumBytes, FillExpr, NumBytesLoc);
4866 
4867  return false;
4868 }
4869 
4870 /// parseDirectiveDCB
4871 /// ::= .dcb.{b, l, w} expression, expression
4872 bool AsmParser::parseDirectiveDCB(StringRef IDVal, unsigned Size) {
4873  SMLoc NumValuesLoc = Lexer.getLoc();
4874  int64_t NumValues;
4875  if (checkForValidSection() || parseAbsoluteExpression(NumValues))
4876  return true;
4877 
4878  if (NumValues < 0) {
4879  Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
4880  return false;
4881  }
4882 
4883  if (parseComma())
4884  return true;
4885 
4886  const MCExpr *Value;
4887  SMLoc ExprLoc = getLexer().getLoc();
4888  if (parseExpression(Value))
4889  return true;
4890 
4891  // Special case constant expressions to match code generator.
4892  if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value)) {
4893  assert(Size <= 8 && "Invalid size");
4894  uint64_t IntValue = MCE->getValue();
4895  if (!isUIntN(8 * Size, IntValue) && !isIntN(8 * Size, IntValue))
4896  return Error(ExprLoc, "literal value out of range for directive");
4897  for (uint64_t i = 0, e = NumValues; i != e; ++i)
4898  getStreamer().emitIntValue(IntValue, Size);
4899  } else {
4900  for (uint64_t i = 0, e = NumValues; i != e; ++i)
4901  getStreamer().emitValue(Value, Size, ExprLoc);
4902  }
4903 
4904  return parseEOL();
4905 }
4906 
4907 /// parseDirectiveRealDCB
4908 /// ::= .dcb.{d, s} expression, expression
4909 bool AsmParser::parseDirectiveRealDCB(StringRef IDVal, const fltSemantics &Semantics) {
4910  SMLoc NumValuesLoc = Lexer.getLoc();
4911  int64_t NumValues;
4912  if (checkForValidSection() || parseAbsoluteExpression(NumValues))
4913  return true;
4914 
4915  if (NumValues < 0) {
4916  Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
4917  return false;
4918  }
4919 
4920  if (parseComma())
4921  return true;
4922 
4923  APInt AsInt;
4924  if (parseRealValue(Semantics, AsInt) || parseEOL())
4925  return true;
4926 
4927  for (uint64_t i = 0, e = NumValues; i != e; ++i)
4928  getStreamer().emitIntValue(AsInt.getLimitedValue(),
4929  AsInt.getBitWidth() / 8);
4930 
4931  return false;
4932 }
4933 
4934 /// parseDirectiveDS
4935 /// ::= .ds.{b, d, l, p, s, w, x} expression
4936 bool AsmParser::parseDirectiveDS(StringRef IDVal, unsigned Size) {
4937  SMLoc NumValuesLoc = Lexer.getLoc();
4938  int64_t NumValues;
4939  if (checkForValidSection() || parseAbsoluteExpression(NumValues) ||
4940  parseEOL())
4941  return true;
4942 
4943  if (NumValues < 0) {
4944  Warning(NumValuesLoc, "'" + Twine(IDVal) + "' directive with negative repeat count has no effect");
4945  return false;
4946  }
4947 
4948  for (uint64_t i = 0, e = NumValues; i != e; ++i)
4949  getStreamer().emitFill(Size, 0);
4950 
4951  return false;
4952 }
4953 
4954 /// parseDirectiveLEB128
4955 /// ::= (.sleb128 | .uleb128) [ expression (, expression)* ]
4956 bool AsmParser::parseDirectiveLEB128(bool Signed) {
4957  if (checkForValidSection())
4958  return true;
4959 
4960  auto parseOp = [&]() -> bool {
4961  const MCExpr *Value;
4962  if (parseExpression(Value))
4963  return true;
4964  if (Signed)
4965  getStreamer().emitSLEB128Value(Value);
4966  else
4967  getStreamer().emitULEB128Value(Value);
4968  return false;
4969  };
4970 
4971  return parseMany(parseOp);
4972 }
4973 
4974 /// parseDirectiveSymbolAttribute
4975 /// ::= { ".globl", ".weak", ... } [ identifier ( , identifier )* ]
4976 bool AsmParser::parseDirectiveSymbolAttribute(MCSymbolAttr Attr) {
4977  auto parseOp = [&]() -> bool {
4978  StringRef Name;
4979  SMLoc Loc = getTok().getLoc();
4980  if (parseIdentifier(Name))
4981  return Error(Loc, "expected identifier");
4982 
4983  if (discardLTOSymbol(Name))
4984  return false;
4985 
4986  MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
4987 
4988  // Assembler local symbols don't make any sense here. Complain loudly.
4989  if (Sym->isTemporary())
4990  return Error(Loc, "non-local symbol required");
4991 
4992  if (!getStreamer().emitSymbolAttribute(Sym, Attr))
4993  return Error(Loc, "unable to emit symbol attribute");
4994  return false;
4995  };
4996 
4997  return parseMany(parseOp);
4998 }
4999 
5000 /// parseDirectiveComm
5001 /// ::= ( .comm | .lcomm ) identifier , size_expression [ , align_expression ]
5002 bool AsmParser::parseDirectiveComm(bool IsLocal) {
5003  if (checkForValidSection())
5004  return true;
5005 
5006  SMLoc IDLoc = getLexer().getLoc();
5007  StringRef Name;
5008  if (parseIdentifier(Name))
5009  return TokError("expected identifier in directive");
5010 
5011  // Handle the identifier as the key symbol.
5012  MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
5013 
5014  if (parseComma())
5015  return true;
5016 
5017  int64_t Size;
5018  SMLoc SizeLoc = getLexer().getLoc();
5019  if (parseAbsoluteExpression(Size))
5020  return true;
5021 
5022  int64_t Pow2Alignment = 0;
5023  SMLoc Pow2AlignmentLoc;
5024  if (getLexer().is(AsmToken::Comma)) {
5025  Lex();
5026  Pow2AlignmentLoc = getLexer().getLoc();
5027  if (parseAbsoluteExpression(Pow2Alignment))
5028  return true;
5029 
5030  LCOMM::LCOMMType LCOMM = Lexer.getMAI().getLCOMMDirectiveAlignmentType();
5031  if (IsLocal && LCOMM == LCOMM::NoAlignment)
5032  return Error(Pow2AlignmentLoc, "alignment not supported on this target");
5033 
5034  // If this target takes alignments in bytes (not log) validate and convert.
5035  if ((!IsLocal && Lexer.getMAI().getCOMMDirectiveAlignmentIsInBytes()) ||
5036  (IsLocal && LCOMM == LCOMM::ByteAlignment)) {
5037  if (!isPowerOf2_64(Pow2Alignment))
5038  return Error(Pow2AlignmentLoc, "alignment must be a power of 2");
5039  Pow2Alignment = Log2_64(Pow2Alignment);
5040  }
5041  }
5042 
5043  if (parseEOL())
5044  return true;
5045 
5046  // NOTE: a size of zero for a .comm should create a undefined symbol
5047  // but a size of .lcomm creates a bss symbol of size zero.
5048  if (Size < 0)
5049  return Error(SizeLoc, "size must be non-negative");
5050 
5051  Sym->redefineIfPossible();
5052  if (!Sym->isUndefined())
5053  return Error(IDLoc, "invalid symbol redefinition");
5054 
5055  // Create the Symbol as a common or local common with Size and Pow2Alignment
5056  if (IsLocal) {
5057  getStreamer().emitLocalCommonSymbol(Sym, Size, 1 << Pow2Alignment);
5058  return false;
5059  }
5060 
5061  getStreamer().emitCommonSymbol(Sym, Size, 1 << Pow2Alignment);
5062  return false;
5063 }
5064 
5065 /// parseDirectiveAbort
5066 /// ::= .abort [... message ...]
5067 bool AsmParser::parseDirectiveAbort() {
5068  // FIXME: Use loc from directive.
5069  SMLoc Loc = getLexer().getLoc();
5070 
5071  StringRef Str = parseStringToEndOfStatement();
5072  if (parseEOL())
5073  return true;
5074 
5075  if (Str.empty())
5076  return Error(Loc, ".abort detected. Assembly stopping.");
5077  else
5078  return Error(Loc, ".abort '" + Str + "' detected. Assembly stopping.");
5079  // FIXME: Actually abort assembly here.
5080 
5081  return false;
5082 }
5083 
5084 /// parseDirectiveInclude
5085 /// ::= .include "filename"
5086 bool AsmParser::parseDirectiveInclude() {
5087  // Allow the strings to have escaped octal character sequence.
5088  std::string Filename;
5089  SMLoc IncludeLoc = getTok().getLoc();
5090 
5091  if (check(getTok().isNot(AsmToken::String),
5092  "expected string in '.include' directive") ||
5093  parseEscapedString(Filename) ||
5094  check(getTok().isNot(AsmToken::EndOfStatement),
5095  "unexpected token in '.include' directive") ||
5096  // Attempt to switch the lexer to the included file before consuming the
5097  // end of statement to avoid losing it when we switch.
5098  check(enterIncludeFile(Filename), IncludeLoc,
5099  "Could not find include file '" + Filename + "'"))
5100  return true;
5101 
5102  return false;
5103 }
5104 
5105 /// parseDirectiveIncbin
5106 /// ::= .incbin "filename" [ , skip [ , count ] ]
5107 bool AsmParser::parseDirectiveIncbin() {
5108  // Allow the strings to have escaped octal character sequence.
5109  std::string Filename;
5110  SMLoc IncbinLoc = getTok().getLoc();
5111  if (check(getTok().isNot(AsmToken::String),
5112  "expected string in '.incbin' directive") ||
5113  parseEscapedString(Filename))
5114  return true;
5115 
5116  int64_t Skip = 0;
5117  const MCExpr *Count = nullptr;
5118  SMLoc SkipLoc, CountLoc;
5119  if (parseOptionalToken(AsmToken::Comma)) {
5120  // The skip expression can be omitted while specifying the count, e.g:
5121  // .incbin "filename",,4
5122  if (getTok().isNot(AsmToken::Comma)) {
5123  if (parseTokenLoc(SkipLoc) || parseAbsoluteExpression(Skip))
5124  return true;
5125  }
5126  if (parseOptionalToken(AsmToken::Comma)) {
5127  CountLoc = getTok().getLoc();
5128  if (parseExpression(Count))
5129  return true;
5130  }
5131  }
5132 
5133  if (parseEOL())
5134  return true;
5135 
5136  if (check(Skip < 0, SkipLoc, "skip is negative"))
5137  return true;
5138 
5139  // Attempt to process the included file.
5140  if (processIncbinFile(Filename, Skip, Count, CountLoc))
5141  return Error(IncbinLoc, "Could not find incbin file '" + Filename + "'");
5142  return false;
5143 }
5144 
5145 /// parseDirectiveIf
5146 /// ::= .if{,eq,ge,gt,le,lt,ne} expression
5147 bool AsmParser::parseDirectiveIf(SMLoc DirectiveLoc, DirectiveKind DirKind) {
5148  TheCondStack.push_back(TheCondState);
5149  TheCondState.TheCond = AsmCond::IfCond;
5150  if (TheCondState.Ignore) {
5151  eatToEndOfStatement();
5152  } else {
5153  int64_t ExprValue;
5154  if (parseAbsoluteExpression(ExprValue) || parseEOL())
5155  return true;
5156 
5157  switch (DirKind) {
5158  default:
5159  llvm_unreachable("unsupported directive");
5160  case DK_IF:
5161  case DK_IFNE:
5162  break;
5163  case DK_IFEQ:
5164  ExprValue = ExprValue == 0;
5165  break;
5166  case DK_IFGE:
5167  ExprValue = ExprValue >= 0;
5168  break;
5169  case DK_IFGT:
5170  ExprValue = ExprValue > 0;
5171  break;
5172  case DK_IFLE:
5173  ExprValue = ExprValue <= 0;
5174  break;
5175  case DK_IFLT:
5176  ExprValue = ExprValue < 0;
5177  break;
5178  }
5179 
5180  TheCondState.CondMet = ExprValue;
5181  TheCondState.Ignore = !TheCondState.CondMet;
5182  }
5183 
5184  return false;
5185 }
5186 
5187 /// parseDirectiveIfb
5188 /// ::= .ifb string
5189 bool AsmParser::parseDirectiveIfb(SMLoc DirectiveLoc, bool ExpectBlank) {
5190  TheCondStack.push_back(TheCondState);
5191  TheCondState.TheCond = AsmCond::IfCond;
5192 
5193  if (TheCondState.Ignore) {
5194  eatToEndOfStatement();
5195  } else {
5196  StringRef Str = parseStringToEndOfStatement();
5197 
5198  if (parseEOL())
5199  return true;
5200 
5201  TheCondState.CondMet = ExpectBlank == Str.empty();
5202  TheCondState.Ignore = !TheCondState.CondMet;
5203  }
5204 
5205  return false;
5206 }
5207 
5208 /// parseDirectiveIfc
5209 /// ::= .ifc string1, string2
5210 /// ::= .ifnc string1, string2
5211 bool AsmParser::parseDirectiveIfc(SMLoc DirectiveLoc, bool ExpectEqual) {
5212  TheCondStack.push_back(TheCondState);
5213  TheCondState.TheCond = AsmCond::IfCond;
5214 
5215  if (TheCondState.Ignore) {
5216  eatToEndOfStatement();
5217  } else {
5218  StringRef Str1 = parseStringToComma();
5219 
5220  if (parseComma())
5221  return true;
5222 
5223  StringRef Str2 = parseStringToEndOfStatement();
5224 
5225  if (parseEOL())
5226  return true;
5227 
5228  TheCondState.CondMet = ExpectEqual == (Str1.trim() == Str2.trim());
5229  TheCondState.Ignore = !TheCondState.CondMet;
5230  }
5231 
5232  return false;
5233 }
5234 
5235 /// parseDirectiveIfeqs
5236 /// ::= .ifeqs string1, string2
5237 bool AsmParser::parseDirectiveIfeqs(SMLoc DirectiveLoc, bool ExpectEqual) {
5238  if (Lexer.isNot(AsmToken::String)) {
5239  if (ExpectEqual)
5240  return TokError("expected string parameter for '.ifeqs' directive");
5241  return TokError("expected string parameter for '.ifnes' directive");
5242  }
5243 
5244  StringRef String1 = getTok().getStringContents();
5245  Lex();
5246 
5247  if (Lexer.isNot(AsmToken::Comma)) {
5248  if (ExpectEqual)
5249  return TokError(
5250  "expected comma after first string for '.ifeqs' directive");
5251  return TokError("expected comma after first string for '.ifnes' directive");
5252  }
5253 
5254  Lex();
5255 
5256  if (Lexer.isNot(AsmToken::String)) {
5257  if (ExpectEqual)
5258  return TokError("expected string parameter for '.ifeqs' directive");
5259  return TokError("expected string parameter for '.ifnes' directive");
5260  }
5261 
5262  StringRef String2 = getTok().getStringContents();
5263  Lex();
5264 
5265  TheCondStack.push_back(TheCondState);
5266  TheCondState.TheCond = AsmCond::IfCond;
5267  TheCondState.CondMet = ExpectEqual == (String1 == String2);
5268  TheCondState.Ignore = !TheCondState.CondMet;
5269 
5270  return false;
5271 }
5272 
5273 /// parseDirectiveIfdef
5274 /// ::= .ifdef symbol
5275 bool AsmParser::parseDirectiveIfdef(SMLoc DirectiveLoc, bool expect_defined) {
5276  StringRef Name;
5277  TheCondStack.push_back(TheCondState);
5278  TheCondState.TheCond = AsmCond::IfCond;
5279 
5280  if (TheCondState.Ignore) {
5281  eatToEndOfStatement();
5282  } else {
5283  if (check(parseIdentifier(Name), "expected identifier after '.ifdef'") ||
5284  parseEOL())
5285  return true;
5286 
5287  MCSymbol *Sym = getContext().lookupSymbol(Name);
5288 
5289  if (expect_defined)
5290  TheCondState.CondMet = (Sym && !Sym->isUndefined(false));
5291  else
5292  TheCondState.CondMet = (!Sym || Sym->isUndefined(false));
5293  TheCondState.Ignore = !TheCondState.CondMet;
5294  }
5295 
5296  return false;
5297 }
5298 
5299 /// parseDirectiveElseIf
5300 /// ::= .elseif expression
5301 bool AsmParser::parseDirectiveElseIf(SMLoc DirectiveLoc) {
5302  if (TheCondState.TheCond != AsmCond::IfCond &&
5303  TheCondState.TheCond != AsmCond::ElseIfCond)
5304  return Error(DirectiveLoc, "Encountered a .elseif that doesn't follow an"
5305  " .if or an .elseif");
5306  TheCondState.TheCond = AsmCond::ElseIfCond;
5307 
5308  bool LastIgnoreState = false;
5309  if (!TheCondStack.empty())
5310  LastIgnoreState = TheCondStack.back().Ignore;
5311  if (LastIgnoreState || TheCondState.CondMet) {
5312  TheCondState.Ignore = true;
5313  eatToEndOfStatement();
5314  } else {
5315  int64_t ExprValue;
5316  if (parseAbsoluteExpression(ExprValue))
5317  return true;
5318 
5319  if (parseEOL())
5320  return true;
5321 
5322  TheCondState.CondMet = ExprValue;
5323  TheCondState.Ignore = !TheCondState.CondMet;
5324  }
5325 
5326  return false;
5327 }
5328 
5329 /// parseDirectiveElse
5330 /// ::= .else
5331 bool AsmParser::parseDirectiveElse(SMLoc DirectiveLoc) {
5332  if (parseEOL())
5333  return true;
5334 
5335  if (TheCondState.TheCond != AsmCond::IfCond &&
5336  TheCondState.TheCond != AsmCond::ElseIfCond)
5337  return Error(DirectiveLoc, "Encountered a .else that doesn't follow "
5338  " an .if or an .elseif");
5339  TheCondState.TheCond = AsmCond::ElseCond;
5340  bool LastIgnoreState = false;
5341  if (!TheCondStack.empty())
5342  LastIgnoreState = TheCondStack.back().Ignore;
5343  if (LastIgnoreState || TheCondState.CondMet)
5344  TheCondState.Ignore = true;
5345  else
5346  TheCondState.Ignore = false;
5347 
5348  return false;
5349 }
5350 
5351 /// parseDirectiveEnd
5352 /// ::= .end
5353 bool AsmParser::parseDirectiveEnd(SMLoc DirectiveLoc) {
5354  if (parseEOL())
5355  return true;
5356 
5357  while (Lexer.isNot(AsmToken::Eof))
5358  Lexer.Lex();
5359 
5360  return false;
5361 }
5362 
5363 /// parseDirectiveError
5364 /// ::= .err
5365 /// ::= .error [string]
5366 bool AsmParser::parseDirectiveError(SMLoc L, bool WithMessage) {
5367  if (!TheCondStack.empty()) {
5368  if (TheCondStack.back().Ignore) {
5369  eatToEndOfStatement();
5370  return false;
5371  }
5372  }
5373 
5374  if (!WithMessage)
5375  return Error(L, ".err encountered");
5376 
5377  StringRef Message = ".error directive invoked in source file";
5378  if (Lexer.isNot(AsmToken::EndOfStatement)) {
5379  if (Lexer.isNot(AsmToken::String))
5380  return TokError(".error argument must be a string");
5381 
5382  Message = getTok().getStringContents();
5383  Lex();
5384  }
5385 
5386  return Error(L, Message);
5387 }
5388 
5389 /// parseDirectiveWarning
5390 /// ::= .warning [string]
5391 bool AsmParser::parseDirectiveWarning(SMLoc L) {
5392  if (!TheCondStack.empty()) {
5393  if (TheCondStack.back().Ignore) {
5394  eatToEndOfStatement();
5395  return false;
5396  }
5397  }
5398 
5399  StringRef Message = ".warning directive invoked in source file";
5400 
5401  if (!parseOptionalToken(AsmToken::EndOfStatement)) {
5402  if (Lexer.isNot(AsmToken::String))
5403  return TokError(".warning argument must be a string");
5404 
5405  Message = getTok().getStringContents();
5406  Lex();
5407  if (parseEOL())
5408  return true;
5409  }
5410 
5411  return Warning(L, Message);
5412 }
5413 
5414 /// parseDirectiveEndIf
5415 /// ::= .endif
5416 bool AsmParser::parseDirectiveEndIf(SMLoc DirectiveLoc) {
5417  if (parseEOL())
5418  return true;
5419 
5420  if ((TheCondState.TheCond == AsmCond::NoCond) || TheCondStack.empty())
5421  return Error(DirectiveLoc, "Encountered a .endif that doesn't follow "
5422  "an .if or .else");
5423  if (!TheCondStack.empty()) {
5424  TheCondState = TheCondStack.back();
5425  TheCondStack.pop_back();
5426  }
5427 
5428  return false;
5429 }
5430 
5431 void AsmParser::initializeDirectiveKindMap() {
5432  /* Lookup will be done with the directive
5433  * converted to lower case, so all these
5434  * keys should be lower case.
5435  * (target specific directives are handled
5436  * elsewhere)
5437  */
5438  DirectiveKindMap[".set"] = DK_SET;
5439  DirectiveKindMap[".equ"] = DK_EQU;
5440  DirectiveKindMap[".equiv"] = DK_EQUIV;
5441  DirectiveKindMap[".ascii"] = DK_ASCII;
5442  DirectiveKindMap[".asciz"] = DK_ASCIZ;
5443  DirectiveKindMap[".string"] = DK_STRING;
5444  DirectiveKindMap[".byte"] = DK_BYTE;
5445  DirectiveKindMap[".short"] = DK_SHORT;
5446  DirectiveKindMap[".value"] = DK_VALUE;
5447  DirectiveKindMap[".2byte"] = DK_2BYTE;
5448  DirectiveKindMap[".long"] = DK_LONG;
5449  DirectiveKindMap[".int"] = DK_INT;
5450  DirectiveKindMap[".4byte"] = DK_4BYTE;
5451  DirectiveKindMap[".quad"] = DK_QUAD;
5452  DirectiveKindMap[".8byte"] = DK_8BYTE;
5453  DirectiveKindMap[".octa"] = DK_OCTA;
5454  DirectiveKindMap[".single"] = DK_SINGLE;
5455  DirectiveKindMap[".float"] = DK_FLOAT;
5456  DirectiveKindMap[".double"] = DK_DOUBLE;
5457  DirectiveKindMap[".align"] = DK_ALIGN;
5458  DirectiveKindMap[".align32"] = DK_ALIGN32;
5459  DirectiveKindMap[".balign"] = DK_BALIGN;
5460  DirectiveKindMap[".balignw"] = DK_BALIGNW;
5461  DirectiveKindMap[".balignl"] = DK_BALIGNL;
5462  DirectiveKindMap[".p2align"] = DK_P2ALIGN;
5463  DirectiveKindMap[".p2alignw"] = DK_P2ALIGNW;
5464  DirectiveKindMap[".p2alignl"] = DK_P2ALIGNL;
5465  DirectiveKindMap[".org"] = DK_ORG;
5466  DirectiveKindMap[".fill"] = DK_FILL;
5467  DirectiveKindMap[".zero"] = DK_ZERO;
5468  DirectiveKindMap[".extern"] = DK_EXTERN;
5469  DirectiveKindMap[".globl"] = DK_GLOBL;
5470  DirectiveKindMap[".global"] = DK_GLOBAL;
5471  DirectiveKindMap[".lazy_reference"] = DK_LAZY_REFERENCE;
5472  DirectiveKindMap[".no_dead_strip"] = DK_NO_DEAD_STRIP;
5473  DirectiveKindMap[".symbol_resolver"] = DK_SYMBOL_RESOLVER;
5474  DirectiveKindMap[".private_extern"] = DK_PRIVATE_EXTERN;
5475  DirectiveKindMap[".reference"] = DK_REFERENCE;
5476  DirectiveKindMap[".weak_definition"] = DK_WEAK_DEFINITION;
5477  DirectiveKindMap[".weak_reference"] = DK_WEAK_REFERENCE;
5478  DirectiveKindMap[".weak_def_can_be_hidden"] = DK_WEAK_DEF_CAN_BE_HIDDEN;
5479  DirectiveKindMap[".cold"] = DK_COLD;
5480  DirectiveKindMap[".comm"] = DK_COMM;
5481  DirectiveKindMap[".common"] = DK_COMMON;
5482  DirectiveKindMap[".lcomm"] = DK_LCOMM;
5483  DirectiveKindMap[".abort"] = DK_ABORT;
5484  DirectiveKindMap[".include"] = DK_INCLUDE;
5485  DirectiveKindMap[".incbin"] = DK_INCBIN;
5486  DirectiveKindMap[".code16"] = DK_CODE16;
5487  DirectiveKindMap[".code16gcc"] = DK_CODE16GCC;
5488  DirectiveKindMap[".rept"] = DK_REPT;
5489  DirectiveKindMap[".rep"] = DK_REPT;
5490  DirectiveKindMap[".irp"] = DK_IRP;
5491  DirectiveKindMap[".irpc"] = DK_IRPC;
5492  DirectiveKindMap[".endr"] = DK_ENDR;
5493  DirectiveKindMap[".bundle_align_mode"] = DK_BUNDLE_ALIGN_MODE;
5494  DirectiveKindMap[".bundle_lock"] = DK_BUNDLE_LOCK;
5495  DirectiveKindMap[".bundle_unlock"] = DK_BUNDLE_UNLOCK;
5496  DirectiveKindMap[".if"] = DK_IF;
5497  DirectiveKindMap[".ifeq"] = DK_IFEQ;
5498  DirectiveKindMap[".ifge"] = DK_IFGE;
5499  DirectiveKindMap[".ifgt"] = DK_IFGT;
5500  DirectiveKindMap[".ifle"] = DK_IFLE;
5501  DirectiveKindMap[".iflt"] = DK_IFLT;
5502  DirectiveKindMap[".ifne"] = DK_IFNE;
5503  DirectiveKindMap[".ifb"] = DK_IFB;
5504  DirectiveKindMap[".ifnb"] = DK_IFNB;
5505  DirectiveKindMap[".ifc"] = DK_IFC;
5506  DirectiveKindMap[".ifeqs"] = DK_IFEQS;
5507  DirectiveKindMap[".ifnc"] = DK_IFNC;
5508  DirectiveKindMap[".ifnes"] = DK_IFNES;
5509  DirectiveKindMap[".ifdef"] = DK_IFDEF;
5510  DirectiveKindMap[".ifndef"] = DK_IFNDEF;
5511  DirectiveKindMap[".ifnotdef"] = DK_IFNOTDEF;
5512  DirectiveKindMap[".elseif"] = DK_ELSEIF;
5513  DirectiveKindMap[".else"] = DK_ELSE;
5514  DirectiveKindMap[".end"] = DK_END;
5515  DirectiveKindMap[".endif"] = DK_ENDIF;
5516  DirectiveKindMap[".skip"] = DK_SKIP;
5517  DirectiveKindMap[".space"] = DK_SPACE;
5518  DirectiveKindMap[".file"] = DK_FILE;
5519  DirectiveKindMap[".line"] = DK_LINE;
5520  DirectiveKindMap[".loc"] = DK_LOC;
5521  DirectiveKindMap[".stabs"] = DK_STABS;
5522  DirectiveKindMap[".cv_file"] = DK_CV_FILE;
5523  DirectiveKindMap[".cv_func_id"] = DK_CV_FUNC_ID;
5524  DirectiveKindMap[".cv_loc"] = DK_CV_LOC;
5525  DirectiveKindMap[".cv_linetable"] = DK_CV_LINETABLE;
5526  DirectiveKindMap[".cv_inline_linetable"] = DK_CV_INLINE_LINETABLE;
5527  DirectiveKindMap[".cv_inline_site_id"] = DK_CV_INLINE_SITE_ID;
5528  DirectiveKindMap[".cv_def_range"] = DK_CV_DEF_RANGE;
5529  DirectiveKindMap[".cv_string"] = DK_CV_STRING;
5530  DirectiveKindMap[".cv_stringtable"] = DK_CV_STRINGTABLE;
5531  DirectiveKindMap[".cv_filechecksums"] = DK_CV_FILECHECKSUMS;
5532  DirectiveKindMap[".cv_filechecksumoffset"] = DK_CV_FILECHECKSUM_OFFSET;
5533  DirectiveKindMap[".cv_fpo_data"] = DK_CV_FPO_DATA;
5534  DirectiveKindMap[".sleb128"] = DK_SLEB128;
5535  DirectiveKindMap[".uleb128"] = DK_ULEB128;
5536  DirectiveKindMap[".cfi_sections"] = DK_CFI_SECTIONS;
5537  DirectiveKindMap[".cfi_startproc"] = DK_CFI_STARTPROC;
5538  DirectiveKindMap[".cfi_endproc"] = DK_CFI_ENDPROC;
5539  DirectiveKindMap[".cfi_def_cfa"] = DK_CFI_DEF_CFA;
5540  DirectiveKindMap[".cfi_def_cfa_offset"] = DK_CFI_DEF_CFA_OFFSET;
5541  DirectiveKindMap[".cfi_adjust_cfa_offset"] = DK_CFI_ADJUST_CFA_OFFSET;
5542  DirectiveKindMap[".cfi_def_cfa_register"] = DK_CFI_DEF_CFA_REGISTER;
5543  DirectiveKindMap[".cfi_llvm_def_aspace_cfa"] = DK_CFI_LLVM_DEF_ASPACE_CFA;
5544  DirectiveKindMap[".cfi_offset"] = DK_CFI_OFFSET;
5545  DirectiveKindMap[".cfi_rel_offset"] = DK_CFI_REL_OFFSET;
5546  DirectiveKindMap[".cfi_personality"] = DK_CFI_PERSONALITY;
5547  DirectiveKindMap[".cfi_lsda"] = DK_CFI_LSDA;
5548  DirectiveKindMap[".cfi_remember_state"] = DK_CFI_REMEMBER_STATE;
5549  DirectiveKindMap[".cfi_restore_state"] = DK_CFI_RESTORE_STATE;
5550  DirectiveKindMap[".cfi_same_value"] = DK_CFI_SAME_VALUE;
5551  DirectiveKindMap[".cfi_restore"] = DK_CFI_RESTORE;
5552  DirectiveKindMap[".cfi_escape"] = DK_CFI_ESCAPE;
5553  DirectiveKindMap[".cfi_return_column"] = DK_CFI_RETURN_COLUMN;
5554  DirectiveKindMap[".cfi_signal_frame"] = DK_CFI_SIGNAL_FRAME;
5555  DirectiveKindMap[".cfi_undefined"] = DK_CFI_UNDEFINED;
5556  DirectiveKindMap[".cfi_register"] = DK_CFI_REGISTER;
5557  DirectiveKindMap[".cfi_window_save"] = DK_CFI_WINDOW_SAVE;
5558  DirectiveKindMap[".cfi_b_key_frame"] = DK_CFI_B_KEY_FRAME;
5559  DirectiveKindMap[".macros_on"] = DK_MACROS_ON;
5560  DirectiveKindMap[".macros_off"] = DK_MACROS_OFF;
5561  DirectiveKindMap[".macro"] = DK_MACRO;
5562  DirectiveKindMap[".exitm"] = DK_EXITM;
5563  DirectiveKindMap[".endm"] = DK_ENDM;
5564  DirectiveKindMap[".endmacro"] = DK_ENDMACRO;
5565  DirectiveKindMap[".purgem"] = DK_PURGEM;
5566  DirectiveKindMap[".err"] = DK_ERR;
5567  DirectiveKindMap[".error"] = DK_ERROR;
5568  DirectiveKindMap[".warning"] = DK_WARNING;
5569  DirectiveKindMap[".altmacro"] = DK_ALTMACRO;
5570  DirectiveKindMap[".noaltmacro"] = DK_NOALTMACRO;
5571  DirectiveKindMap[".reloc"] = DK_RELOC;
5572  DirectiveKindMap[".dc"] = DK_DC;
5573  DirectiveKindMap[".dc.a"] = DK_DC_A;
5574  DirectiveKindMap[".dc.b"] = DK_DC_B;
5575  DirectiveKindMap[".dc.d"] = DK_DC_D;
5576  DirectiveKindMap[".dc.l"] = DK_DC_L;
5577  DirectiveKindMap[".dc.s"] = DK_DC_S;
5578  DirectiveKindMap[".dc.w"] = DK_DC_W;
5579  DirectiveKindMap[".dc.x"] = DK_DC_X;
5580  DirectiveKindMap[".dcb"] = DK_DCB;
5581  DirectiveKindMap[".dcb.b"] = DK_DCB_B;
5582  DirectiveKindMap[".dcb.d"] = DK_DCB_D;
5583  DirectiveKindMap[".dcb.l"] = DK_DCB_L;
5584  DirectiveKindMap[".dcb.s"] = DK_DCB_S;
5585  DirectiveKindMap[".dcb.w"] = DK_DCB_W;
5586  DirectiveKindMap[".dcb.x"] = DK_DCB_X;
5587  DirectiveKindMap[".ds"] = DK_DS;
5588  DirectiveKindMap[".ds.b"] = DK_DS_B;
5589  DirectiveKindMap[".ds.d"] = DK_DS_D;
5590  DirectiveKindMap[".ds.l"] = DK_DS_L;
5591  DirectiveKindMap[".ds.p"] = DK_DS_P;
5592  DirectiveKindMap[".ds.s"] = DK_DS_S;
5593  DirectiveKindMap[".ds.w"] = DK_DS_W;
5594  DirectiveKindMap[".ds.x"] = DK_DS_X;
5595  DirectiveKindMap[".print"] = DK_PRINT;
5596  DirectiveKindMap[".addrsig"] = DK_ADDRSIG;
5597  DirectiveKindMap[".addrsig_sym"] = DK_ADDRSIG_SYM;
5598  DirectiveKindMap[".pseudoprobe"] = DK_PSEUDO_PROBE;
5599  DirectiveKindMap[".lto_discard"] = DK_LTO_DISCARD;
5600  DirectiveKindMap[".lto_set_conditional"] = DK_LTO_SET_CONDITIONAL;
5601 }
5602 
5603 MCAsmMacro *AsmParser::parseMacroLikeBody(SMLoc DirectiveLoc) {
5604  AsmToken EndToken, StartToken = getTok();
5605 
5606  unsigned NestLevel = 0;
5607  while (true) {
5608  // Check whether we have reached the end of the file.
5609  if (getLexer().is(AsmToken::Eof)) {
5610  printError(DirectiveLoc, "no matching '.endr' in definition");
5611  return nullptr;
5612  }
5613 
5614  if (Lexer.is(AsmToken::Identifier) &&
5615  (getTok().getIdentifier() == ".rep" ||
5616  getTok().getIdentifier() == ".rept" ||
5617  getTok().getIdentifier() == ".irp" ||
5618  getTok().getIdentifier() == ".irpc")) {
5619  ++NestLevel;
5620  }
5621 
5622  // Otherwise, check whether we have reached the .endr.
5623  if (Lexer.is(AsmToken::Identifier) && getTok().getIdentifier() == ".endr") {
5624  if (NestLevel == 0) {
5625  EndToken = getTok();
5626  Lex();
5627  if (Lexer.isNot(AsmToken::EndOfStatement)) {
5628  printError(getTok().getLoc(),
5629  "unexpected token in '.endr' directive");
5630  return nullptr;
5631  }
5632  break;
5633  }
5634  --NestLevel;
5635  }
5636 
5637  // Otherwise, scan till the end of the statement.
5638  eatToEndOfStatement();
5639  }
5640 
5641  const char *BodyStart = StartToken.getLoc().getPointer();
5642  const char *BodyEnd = EndToken.getLoc().getPointer();
5643  StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
5644 
5645  // We Are Anonymous.
5646  MacroLikeBodies.emplace_back(StringRef(), Body, MCAsmMacroParameters());
5647  return &MacroLikeBodies.back();
5648 }
5649 
5650 void AsmParser::instantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
5651  raw_svector_ostream &OS) {
5652  OS << ".endr\n";
5653 
5654  std::unique_ptr<MemoryBuffer> Instantiation =
5655  MemoryBuffer::getMemBufferCopy(OS.str(), "<instantiation>");
5656 
5657  // Create the macro instantiation object and add to the current macro
5658  // instantiation stack.
5659  MacroInstantiation *MI = new MacroInstantiation{
5660  DirectiveLoc, CurBuffer, getTok().getLoc(), TheCondStack.size()};
5661  ActiveMacros.push_back(MI);
5662 
5663  // Jump to the macro instantiation and prime the lexer.
5664  CurBuffer = SrcMgr.AddNewSourceBuffer(std::move(Instantiation), SMLoc());
5665  Lexer.setBuffer(SrcMgr.getMemoryBuffer(CurBuffer)->getBuffer());
5666  Lex();
5667 }
5668 
5669 /// parseDirectiveRept
5670 /// ::= .rep | .rept count
5671 bool AsmParser::parseDirectiveRept(SMLoc DirectiveLoc, StringRef Dir) {
5672  const MCExpr *CountExpr;
5673  SMLoc CountLoc = getTok().getLoc();
5674  if (parseExpression(CountExpr))
5675  return true;
5676 
5677  int64_t Count;
5678  if (!CountExpr->evaluateAsAbsolute(Count, getStreamer().getAssemblerPtr())) {
5679  return Error(CountLoc, "unexpected token in '" + Dir + "' directive");
5680  }
5681 
5682  if (check(Count < 0, CountLoc, "Count is negative") || parseEOL())
5683  return true;
5684 
5685  // Lex the rept definition.
5686  MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
5687  if (!M)
5688  return true;
5689 
5690  // Macro instantiation is lexical, unfortunately. We construct a new buffer
5691  // to hold the macro body with substitutions.
5692  SmallString<256> Buf;
5693  raw_svector_ostream OS(Buf);
5694  while (Count--) {
5695  // Note that the AtPseudoVariable is disabled for instantiations of .rep(t).
5696  if (expandMacro(OS, M->Body, None, None, false, getTok().getLoc()))
5697  return true;
5698  }
5699  instantiateMacroLikeBody(M, DirectiveLoc, OS);
5700 
5701  return false;
5702 }
5703 
5704 /// parseDirectiveIrp
5705 /// ::= .irp symbol,values
5706 bool AsmParser::parseDirectiveIrp(SMLoc DirectiveLoc) {
5707  MCAsmMacroParameter Parameter;
5708  MCAsmMacroArguments A;
5709  if (check(parseIdentifier(Parameter.Name),
5710  "expected identifier in '.irp' directive") ||
5711  parseComma() || parseMacroArguments(nullptr, A) || parseEOL())
5712  return true;
5713 
5714  // Lex the irp definition.
5715  MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
5716  if (!M)
5717  return true;
5718 
5719  // Macro instantiation is lexical, unfortunately. We construct a new buffer
5720  // to hold the macro body with substitutions.
5721  SmallString<256> Buf;
5722  raw_svector_ostream OS(Buf);
5723 
5724  for (const MCAsmMacroArgument &Arg : A) {
5725  // Note that the AtPseudoVariable is enabled for instantiations of .irp.
5726  // This is undocumented, but GAS seems to support it.
5727  if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc()))
5728  return true;
5729  }
5730 
5731  instantiateMacroLikeBody(M, DirectiveLoc, OS);
5732 
5733  return false;
5734 }
5735 
5736 /// parseDirectiveIrpc
5737 /// ::= .irpc symbol,values
5738 bool AsmParser::parseDirectiveIrpc(SMLoc DirectiveLoc) {
5739  MCAsmMacroParameter Parameter;
5740  MCAsmMacroArguments A;
5741 
5742  if (check(parseIdentifier(Parameter.Name),
5743  "expected identifier in '.irpc' directive") ||
5744  parseComma() || parseMacroArguments(nullptr, A))
5745  return true;
5746 
5747  if (A.size() != 1 || A.front().size() != 1)
5748  return TokError("unexpected token in '.irpc' directive");
5749  if (parseEOL())
5750  return true;
5751 
5752  // Lex the irpc definition.
5753  MCAsmMacro *M = parseMacroLikeBody(DirectiveLoc);
5754  if (!M)
5755  return true;
5756 
5757  // Macro instantiation is lexical, unfortunately. We construct a new buffer
5758  // to hold the macro body with substitutions.
5759  SmallString<256> Buf;
5760  raw_svector_ostream OS(Buf);
5761 
5762  StringRef Values = A.front().front().getString();
5763  for (std::size_t I = 0, End = Values.size(); I != End; ++I) {
5764  MCAsmMacroArgument Arg;
5765  Arg.emplace_back(AsmToken::Identifier, Values.slice(I, I + 1));
5766 
5767  // Note that the AtPseudoVariable is enabled for instantiations of .irpc.
5768  // This is undocumented, but GAS seems to support it.
5769  if (expandMacro(OS, M->Body, Parameter, Arg, true, getTok().getLoc()))
5770  return true;
5771  }
5772 
5773  instantiateMacroLikeBody(M, DirectiveLoc, OS);
5774 
5775  return false;
5776 }
5777 
5778 bool AsmParser::parseDirectiveEndr(SMLoc DirectiveLoc) {
5779  if (ActiveMacros.empty())
5780  return TokError("unmatched '.endr' directive");
5781 
5782  // The only .repl that should get here are the ones created by
5783  // instantiateMacroLikeBody.
5784  assert(getLexer().is(AsmToken::EndOfStatement));
5785 
5786  handleMacroExit();
5787  return false;
5788 }
5789 
5790 bool AsmParser::parseDirectiveMSEmit(SMLoc IDLoc, ParseStatementInfo &Info,
5791  size_t Len) {
5792  const MCExpr *Value;
5793  SMLoc ExprLoc = getLexer().getLoc();
5794  if (parseExpression(Value))
5795  return true;
5796  const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
5797  if (!MCE)
5798  return Error(ExprLoc, "unexpected expression in _emit");
5799  uint64_t IntValue = MCE->getValue();
5800  if (!isUInt<8>(IntValue) && !isInt<8>(IntValue))
5801  return Error(ExprLoc, "literal value out of range for directive");
5802 
5803  Info.AsmRewrites->emplace_back(AOK_Emit, IDLoc, Len);
5804  return false;
5805 }
5806 
5807 bool AsmParser::parseDirectiveMSAlign(SMLoc IDLoc, ParseStatementInfo &Info) {
5808  const MCExpr *Value;
5809  SMLoc ExprLoc = getLexer().getLoc();
5810  if (parseExpression(Value))
5811  return true;
5812  const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(Value);
5813  if (!MCE)
5814  return Error(ExprLoc, "unexpected expression in align");
5815  uint64_t IntValue = MCE->getValue();
5816  if (!isPowerOf2_64(IntValue))
5817  return Error(ExprLoc, "literal value not a power of two greater then zero");
5818 
5819  Info.AsmRewrites->emplace_back(AOK_Align, IDLoc, 5, Log2_64(IntValue));
5820  return false;
5821 }
5822 
5823 bool AsmParser::parseDirectivePrint(SMLoc DirectiveLoc) {
5824  const AsmToken StrTok = getTok();
5825  Lex();
5826  if (StrTok.isNot(AsmToken::String) || StrTok.getString().front() != '"')
5827  return Error(DirectiveLoc, "expected double quoted string after .print");
5828  if (parseEOL())
5829  return true;
5830  llvm::outs() << StrTok.getStringContents() << '\n';
5831  return false;
5832 }
5833 
5834 bool AsmParser::parseDirectiveAddrsig() {
5835  if (parseEOL())
5836  return true;
5837  getStreamer().emitAddrsig();
5838  return false;
5839 }
5840 
5841 bool AsmParser::parseDirectiveAddrsigSym() {
5842  StringRef Name;
5843  if (check(parseIdentifier(Name), "expected identifier") || parseEOL())
5844  return true;
5845  MCSymbol *Sym = getContext().getOrCreateSymbol(Name);
5846  getStreamer().emitAddrsigSym(Sym);
5847  return false;
5848 }
5849 
5850 bool AsmParser::parseDirectivePseudoProbe() {
5851  int64_t Guid;
5852  int64_t Index;
5853  int64_t Type;
5854  int64_t Attr;
5855 
5856  if (getLexer().is(AsmToken::Integer)) {
5857  if (parseIntToken(Guid, "unexpected token in '.pseudoprobe' directive"))
5858  return true;
5859  }
5860 
5861  if (getLexer().is(AsmToken::Integer)) {
5862  if (parseIntToken(Index, "unexpected token in '.pseudoprobe' directive"))
5863  return true;
5864  }
5865 
5866  if (getLexer().is(AsmToken::Integer)) {
5867  if (parseIntToken(Type, "unexpected token in '.pseudoprobe' directive"))
5868  return true;
5869  }
5870 
5871  if (getLexer().is(AsmToken::Integer)) {
5872  if (parseIntToken(Attr, "unexpected token in '.pseudoprobe' directive"))
5873  return true;
5874  }
5875 
5876  // Parse inline stack like @ GUID:11:12 @ GUID:1:11 @ GUID:3:21
5877  MCPseudoProbeInlineStack InlineStack;
5878 
5879  while (getLexer().is(AsmToken::At)) {
5880  // eat @
5881  Lex();
5882 
5883  int64_t CallerGuid = 0;
5884  if (getLexer().is(AsmToken::Integer)) {
5885  if (parseIntToken(CallerGuid,
5886  "unexpected token in '.pseudoprobe' directive"))
5887  return true;
5888  }
5889 
5890  // eat colon
5891  if (getLexer().is(AsmToken::Colon))
5892  Lex();
5893 
5894  int64_t CallerProbeId = 0;
5895  if (getLexer().is(AsmToken::Integer)) {
5896  if (parseIntToken(CallerProbeId,
5897  "unexpected token in '.pseudoprobe' directive"))
5898  return true;
5899  }
5900 
5901  InlineSite Site(CallerGuid, CallerProbeId);
5902  InlineStack.push_back(Site);
5903  }
5904 
5905  if (parseEOL())
5906  return true;
5907 
5908  getStreamer().emitPseudoProbe(Guid, Index, Type, Attr, InlineStack);
5909  return false;
5910 }
5911 
5912 /// parseDirectiveLTODiscard
5913 /// ::= ".lto_discard" [ identifier ( , identifier )* ]
5914 /// The LTO library emits this directive to discard non-prevailing symbols.
5915 /// We ignore symbol assignments and attribute changes for the specified
5916 /// symbols.
5917 bool AsmParser::parseDirectiveLTODiscard() {
5918  auto ParseOp = [&]() -> bool {
5919  StringRef Name;
5920  SMLoc Loc = getTok().getLoc();
5921  if (parseIdentifier(Name))
5922  return Error(Loc, "expected identifier");
5923  LTODiscardSymbols.insert(Name);
5924  return false;
5925  };
5926 
5927  LTODiscardSymbols.clear();
5928  return parseMany(ParseOp);
5929 }
5930 
5931 // We are comparing pointers, but the pointers are relative to a single string.
5932 // Thus, this should always be deterministic.
5933 static int rewritesSort(const AsmRewrite *AsmRewriteA,
5934  const AsmRewrite *AsmRewriteB) {
5935  if (AsmRewriteA->Loc.getPointer() < AsmRewriteB->Loc.getPointer())
5936  return -1;
5937  if (AsmRewriteB->Loc.getPointer() < AsmRewriteA->Loc.getPointer())
5938  return 1;
5939 
5940  // It's possible to have a SizeDirective, Imm/ImmPrefix and an Input/Output
5941  // rewrite to the same location. Make sure the SizeDirective rewrite is
5942  // performed first, then the Imm/ImmPrefix and finally the Input/Output. This
5943  // ensures the sort algorithm is stable.
5944  if (AsmRewritePrecedence[AsmRewriteA->Kind] >
5945  AsmRewritePrecedence[AsmRewriteB->Kind])
5946  return -1;
5947 
5948  if (AsmRewritePrecedence[AsmRewriteA->Kind] <
5949  AsmRewritePrecedence[AsmRewriteB->Kind])
5950  return 1;
5951  llvm_unreachable("Unstable rewrite sort.");
5952 }
5953 
5954 bool AsmParser::parseMSInlineAsm(
5955  std::string &AsmString, unsigned &NumOutputs, unsigned &NumInputs,
5956  SmallVectorImpl<std::pair<vo