1 //===--- Lexer.h - C Language Family Lexer ----------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines the Lexer interface. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CLANG_LEXER_H 15 #define LLVM_CLANG_LEXER_H 16 17 #include "clang/Basic/LangOptions.h" 18 #include "clang/Lex/PreprocessorLexer.h" 19 #include "llvm/ADT/SmallVector.h" 20 #include <cassert> 21 #include <string> 22 23 namespace clang { 24 class DiagnosticsEngine; 25 class SourceManager; 26 class Preprocessor; 27 class DiagnosticBuilder; 28 29 /// ConflictMarkerKind - Kinds of conflict marker which the lexer might be 30 /// recovering from. 31 enum ConflictMarkerKind { 32 /// Not within a conflict marker. 33 CMK_None, 34 /// A normal or diff3 conflict marker, initiated by at least 7 "<"s, 35 /// separated by at least 7 "="s or "|"s, and terminated by at least 7 ">"s. 36 CMK_Normal, 37 /// A Perforce-style conflict marker, initiated by 4 ">"s, 38 /// separated by 4 "="s, and terminated by 4 "<"s. 39 CMK_Perforce 40 }; 41 42 /// Lexer - This provides a simple interface that turns a text buffer into a 43 /// stream of tokens. This provides no support for file reading or buffering, 44 /// or buffering/seeking of tokens, only forward lexing is supported. It relies 45 /// on the specified Preprocessor object to handle preprocessor directives, etc. 46 class Lexer : public PreprocessorLexer { 47 virtual void anchor(); 48 49 //===--------------------------------------------------------------------===// 50 // Constant configuration values for this lexer. 51 const char *BufferStart; // Start of the buffer. 52 const char *BufferEnd; // End of the buffer. 53 SourceLocation FileLoc; // Location for start of file. 54 LangOptions LangOpts; // LangOpts enabled by this language (cache). 55 bool Is_PragmaLexer; // True if lexer for _Pragma handling. 56 57 //===--------------------------------------------------------------------===// 58 // Context-specific lexing flags set by the preprocessor. 59 // 60 61 /// ExtendedTokenMode - The lexer can optionally keep comments and whitespace 62 /// and return them as tokens. This is used for -C and -CC modes, and 63 /// whitespace preservation can be useful for some clients that want to lex 64 /// the file in raw mode and get every character from the file. 65 /// 66 /// When this is set to 2 it returns comments and whitespace. When set to 1 67 /// it returns comments, when it is set to 0 it returns normal tokens only. 68 unsigned char ExtendedTokenMode; 69 70 //===--------------------------------------------------------------------===// 71 // Context that changes as the file is lexed. 72 // NOTE: any state that mutates when in raw mode must have save/restore code 73 // in Lexer::isNextPPTokenLParen. 74 75 // BufferPtr - Current pointer into the buffer. This is the next character 76 // to be lexed. 77 const char *BufferPtr; 78 79 // IsAtStartOfLine - True if the next lexed token should get the "start of 80 // line" flag set on it. 81 bool IsAtStartOfLine; 82 83 // CurrentConflictMarkerState - The kind of conflict marker we are handling. 84 ConflictMarkerKind CurrentConflictMarkerState; 85 86 Lexer(const Lexer &) LLVM_DELETED_FUNCTION; 87 void operator=(const Lexer &) LLVM_DELETED_FUNCTION; 88 friend class Preprocessor; 89 90 void InitLexer(const char *BufStart, const char *BufPtr, const char *BufEnd); 91 public: 92 93 /// Lexer constructor - Create a new lexer object for the specified buffer 94 /// with the specified preprocessor managing the lexing process. This lexer 95 /// assumes that the associated file buffer and Preprocessor objects will 96 /// outlive it, so it doesn't take ownership of either of them. 97 Lexer(FileID FID, const llvm::MemoryBuffer *InputBuffer, Preprocessor &PP); 98 99 /// Lexer constructor - Create a new raw lexer object. This object is only 100 /// suitable for calls to 'LexFromRawLexer'. This lexer assumes that the 101 /// text range will outlive it, so it doesn't take ownership of it. 102 Lexer(SourceLocation FileLoc, const LangOptions &LangOpts, 103 const char *BufStart, const char *BufPtr, const char *BufEnd); 104 105 /// Lexer constructor - Create a new raw lexer object. This object is only 106 /// suitable for calls to 'LexFromRawLexer'. This lexer assumes that the 107 /// text range will outlive it, so it doesn't take ownership of it. 108 Lexer(FileID FID, const llvm::MemoryBuffer *InputBuffer, 109 const SourceManager &SM, const LangOptions &LangOpts); 110 111 /// Create_PragmaLexer: Lexer constructor - Create a new lexer object for 112 /// _Pragma expansion. This has a variety of magic semantics that this method 113 /// sets up. It returns a new'd Lexer that must be delete'd when done. 114 static Lexer *Create_PragmaLexer(SourceLocation SpellingLoc, 115 SourceLocation ExpansionLocStart, 116 SourceLocation ExpansionLocEnd, 117 unsigned TokLen, Preprocessor &PP); 118 119 120 /// getLangOpts - Return the language features currently enabled. 121 /// NOTE: this lexer modifies features as a file is parsed! 122 const LangOptions &getLangOpts() const { return LangOpts; } 123 124 /// getFileLoc - Return the File Location for the file we are lexing out of. 125 /// The physical location encodes the location where the characters come from, 126 /// the virtual location encodes where we should *claim* the characters came 127 /// from. Currently this is only used by _Pragma handling. 128 SourceLocation getFileLoc() const { return FileLoc; } 129 130 /// Lex - Return the next token in the file. If this is the end of file, it 131 /// return the tok::eof token. This implicitly involves the preprocessor. 132 void Lex(Token &Result) { 133 // Start a new token. 134 Result.startToken(); 135 136 // NOTE, any changes here should also change code after calls to 137 // Preprocessor::HandleDirective 138 if (IsAtStartOfLine) { 139 Result.setFlag(Token::StartOfLine); 140 IsAtStartOfLine = false; 141 } 142 143 // Get a token. Note that this may delete the current lexer if the end of 144 // file is reached. 145 LexTokenInternal(Result); 146 } 147 148 /// isPragmaLexer - Returns true if this Lexer is being used to lex a pragma. 149 bool isPragmaLexer() const { return Is_PragmaLexer; } 150 151 /// IndirectLex - An indirect call to 'Lex' that can be invoked via 152 /// the PreprocessorLexer interface. 153 void IndirectLex(Token &Result) { Lex(Result); } 154 155 /// LexFromRawLexer - Lex a token from a designated raw lexer (one with no 156 /// associated preprocessor object. Return true if the 'next character to 157 /// read' pointer points at the end of the lexer buffer, false otherwise. 158 bool LexFromRawLexer(Token &Result) { 159 assert(LexingRawMode && "Not already in raw mode!"); 160 Lex(Result); 161 // Note that lexing to the end of the buffer doesn't implicitly delete the 162 // lexer when in raw mode. 163 return BufferPtr == BufferEnd; 164 } 165 166 /// isKeepWhitespaceMode - Return true if the lexer should return tokens for 167 /// every character in the file, including whitespace and comments. This 168 /// should only be used in raw mode, as the preprocessor is not prepared to 169 /// deal with the excess tokens. 170 bool isKeepWhitespaceMode() const { 171 return ExtendedTokenMode > 1; 172 } 173 174 /// SetKeepWhitespaceMode - This method lets clients enable or disable 175 /// whitespace retention mode. 176 void SetKeepWhitespaceMode(bool Val) { 177 assert((!Val || LexingRawMode || LangOpts.TraditionalCPP) && 178 "Can only retain whitespace in raw mode or -traditional-cpp"); 179 ExtendedTokenMode = Val ? 2 : 0; 180 } 181 182 /// inKeepCommentMode - Return true if the lexer should return comments as 183 /// tokens. 184 bool inKeepCommentMode() const { 185 return ExtendedTokenMode > 0; 186 } 187 188 /// SetCommentRetentionMode - Change the comment retention mode of the lexer 189 /// to the specified mode. This is really only useful when lexing in raw 190 /// mode, because otherwise the lexer needs to manage this. 191 void SetCommentRetentionState(bool Mode) { 192 assert(!isKeepWhitespaceMode() && 193 "Can't play with comment retention state when retaining whitespace"); 194 ExtendedTokenMode = Mode ? 1 : 0; 195 } 196 197 /// Sets the extended token mode back to its initial value, according to the 198 /// language options and preprocessor. This controls whether the lexer 199 /// produces comment and whitespace tokens. 200 /// 201 /// This requires the lexer to have an associated preprocessor. A standalone 202 /// lexer has nothing to reset to. 203 void resetExtendedTokenMode(); 204 205 const char *getBufferStart() const { return BufferStart; } 206 207 /// ReadToEndOfLine - Read the rest of the current preprocessor line as an 208 /// uninterpreted string. This switches the lexer out of directive mode. 209 void ReadToEndOfLine(SmallVectorImpl<char> *Result = 0); 210 211 212 /// Diag - Forwarding function for diagnostics. This translate a source 213 /// position in the current buffer into a SourceLocation object for rendering. 214 DiagnosticBuilder Diag(const char *Loc, unsigned DiagID) const; 215 216 /// getSourceLocation - Return a source location identifier for the specified 217 /// offset in the current file. 218 SourceLocation getSourceLocation(const char *Loc, unsigned TokLen = 1) const; 219 220 /// getSourceLocation - Return a source location for the next character in 221 /// the current file. 222 SourceLocation getSourceLocation() { return getSourceLocation(BufferPtr); } 223 224 /// \brief Return the current location in the buffer. 225 const char *getBufferLocation() const { return BufferPtr; } 226 227 /// Stringify - Convert the specified string into a C string by escaping '\' 228 /// and " characters. This does not add surrounding ""'s to the string. 229 /// If Charify is true, this escapes the ' character instead of ". 230 static std::string Stringify(const std::string &Str, bool Charify = false); 231 232 /// Stringify - Convert the specified string into a C string by escaping '\' 233 /// and " characters. This does not add surrounding ""'s to the string. 234 static void Stringify(SmallVectorImpl<char> &Str); 235 236 237 /// getSpelling - This method is used to get the spelling of a token into a 238 /// preallocated buffer, instead of as an std::string. The caller is required 239 /// to allocate enough space for the token, which is guaranteed to be at least 240 /// Tok.getLength() bytes long. The length of the actual result is returned. 241 /// 242 /// Note that this method may do two possible things: it may either fill in 243 /// the buffer specified with characters, or it may *change the input pointer* 244 /// to point to a constant buffer with the data already in it (avoiding a 245 /// copy). The caller is not allowed to modify the returned buffer pointer 246 /// if an internal buffer is returned. 247 static unsigned getSpelling(const Token &Tok, const char *&Buffer, 248 const SourceManager &SourceMgr, 249 const LangOptions &LangOpts, 250 bool *Invalid = 0); 251 252 /// getSpelling() - Return the 'spelling' of the Tok token. The spelling of a 253 /// token is the characters used to represent the token in the source file 254 /// after trigraph expansion and escaped-newline folding. In particular, this 255 /// wants to get the true, uncanonicalized, spelling of things like digraphs 256 /// UCNs, etc. 257 static std::string getSpelling(const Token &Tok, 258 const SourceManager &SourceMgr, 259 const LangOptions &LangOpts, 260 bool *Invalid = 0); 261 262 /// getSpelling - This method is used to get the spelling of the 263 /// token at the given source location. If, as is usually true, it 264 /// is not necessary to copy any data, then the returned string may 265 /// not point into the provided buffer. 266 /// 267 /// This method lexes at the expansion depth of the given 268 /// location and does not jump to the expansion or spelling 269 /// location. 270 static StringRef getSpelling(SourceLocation loc, 271 SmallVectorImpl<char> &buffer, 272 const SourceManager &SourceMgr, 273 const LangOptions &LangOpts, 274 bool *invalid = 0); 275 276 /// MeasureTokenLength - Relex the token at the specified location and return 277 /// its length in bytes in the input file. If the token needs cleaning (e.g. 278 /// includes a trigraph or an escaped newline) then this count includes bytes 279 /// that are part of that. 280 static unsigned MeasureTokenLength(SourceLocation Loc, 281 const SourceManager &SM, 282 const LangOptions &LangOpts); 283 284 /// \brief Relex the token at the specified location. 285 /// \returns true if there was a failure, false on success. 286 static bool getRawToken(SourceLocation Loc, Token &Result, 287 const SourceManager &SM, 288 const LangOptions &LangOpts); 289 290 /// \brief Given a location any where in a source buffer, find the location 291 /// that corresponds to the beginning of the token in which the original 292 /// source location lands. 293 static SourceLocation GetBeginningOfToken(SourceLocation Loc, 294 const SourceManager &SM, 295 const LangOptions &LangOpts); 296 297 /// AdvanceToTokenCharacter - If the current SourceLocation specifies a 298 /// location at the start of a token, return a new location that specifies a 299 /// character within the token. This handles trigraphs and escaped newlines. 300 static SourceLocation AdvanceToTokenCharacter(SourceLocation TokStart, 301 unsigned Character, 302 const SourceManager &SM, 303 const LangOptions &LangOpts); 304 305 /// \brief Computes the source location just past the end of the 306 /// token at this source location. 307 /// 308 /// This routine can be used to produce a source location that 309 /// points just past the end of the token referenced by \p Loc, and 310 /// is generally used when a diagnostic needs to point just after a 311 /// token where it expected something different that it received. If 312 /// the returned source location would not be meaningful (e.g., if 313 /// it points into a macro), this routine returns an invalid 314 /// source location. 315 /// 316 /// \param Offset an offset from the end of the token, where the source 317 /// location should refer to. The default offset (0) produces a source 318 /// location pointing just past the end of the token; an offset of 1 produces 319 /// a source location pointing to the last character in the token, etc. 320 static SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset, 321 const SourceManager &SM, 322 const LangOptions &LangOpts); 323 324 /// \brief Returns true if the given MacroID location points at the first 325 /// token of the macro expansion. 326 /// 327 /// \param MacroBegin If non-null and function returns true, it is set to 328 /// begin location of the macro. 329 static bool isAtStartOfMacroExpansion(SourceLocation loc, 330 const SourceManager &SM, 331 const LangOptions &LangOpts, 332 SourceLocation *MacroBegin = 0); 333 334 /// \brief Returns true if the given MacroID location points at the last 335 /// token of the macro expansion. 336 /// 337 /// \param MacroEnd If non-null and function returns true, it is set to 338 /// end location of the macro. 339 static bool isAtEndOfMacroExpansion(SourceLocation loc, 340 const SourceManager &SM, 341 const LangOptions &LangOpts, 342 SourceLocation *MacroEnd = 0); 343 344 /// \brief Accepts a range and returns a character range with file locations. 345 /// 346 /// Returns a null range if a part of the range resides inside a macro 347 /// expansion or the range does not reside on the same FileID. 348 /// 349 /// This function is trying to deal with macros and return a range based on 350 /// file locations. The cases where it can successfully handle macros are: 351 /// 352 /// -begin or end range lies at the start or end of a macro expansion, in 353 /// which case the location will be set to the expansion point, e.g: 354 /// \#define M 1 2 355 /// a M 356 /// If you have a range [a, 2] (where 2 came from the macro), the function 357 /// will return a range for "a M" 358 /// if you have range [a, 1], the function will fail because the range 359 /// overlaps with only a part of the macro 360 /// 361 /// -The macro is a function macro and the range can be mapped to the macro 362 /// arguments, e.g: 363 /// \#define M 1 2 364 /// \#define FM(x) x 365 /// FM(a b M) 366 /// if you have range [b, 2], the function will return the file range "b M" 367 /// inside the macro arguments. 368 /// if you have range [a, 2], the function will return the file range 369 /// "FM(a b M)" since the range includes all of the macro expansion. 370 static CharSourceRange makeFileCharRange(CharSourceRange Range, 371 const SourceManager &SM, 372 const LangOptions &LangOpts); 373 374 /// \brief Returns a string for the source that the range encompasses. 375 static StringRef getSourceText(CharSourceRange Range, 376 const SourceManager &SM, 377 const LangOptions &LangOpts, 378 bool *Invalid = 0); 379 380 /// \brief Retrieve the name of the immediate macro expansion. 381 /// 382 /// This routine starts from a source location, and finds the name of the macro 383 /// responsible for its immediate expansion. It looks through any intervening 384 /// macro argument expansions to compute this. It returns a StringRef which 385 /// refers to the SourceManager-owned buffer of the source where that macro 386 /// name is spelled. Thus, the result shouldn't out-live that SourceManager. 387 static StringRef getImmediateMacroName(SourceLocation Loc, 388 const SourceManager &SM, 389 const LangOptions &LangOpts); 390 391 /// \brief Compute the preamble of the given file. 392 /// 393 /// The preamble of a file contains the initial comments, include directives, 394 /// and other preprocessor directives that occur before the code in this 395 /// particular file actually begins. The preamble of the main source file is 396 /// a potential prefix header. 397 /// 398 /// \param Buffer The memory buffer containing the file's contents. 399 /// 400 /// \param MaxLines If non-zero, restrict the length of the preamble 401 /// to fewer than this number of lines. 402 /// 403 /// \returns The offset into the file where the preamble ends and the rest 404 /// of the file begins along with a boolean value indicating whether 405 /// the preamble ends at the beginning of a new line. 406 static std::pair<unsigned, bool> 407 ComputePreamble(const llvm::MemoryBuffer *Buffer, const LangOptions &LangOpts, 408 unsigned MaxLines = 0); 409 410 /// \brief Checks that the given token is the first token that occurs after 411 /// the given location (this excludes comments and whitespace). Returns the 412 /// location immediately after the specified token. If the token is not found 413 /// or the location is inside a macro, the returned source location will be 414 /// invalid. 415 static SourceLocation findLocationAfterToken(SourceLocation loc, 416 tok::TokenKind TKind, 417 const SourceManager &SM, 418 const LangOptions &LangOpts, 419 bool SkipTrailingWhitespaceAndNewLine); 420 421 /// \brief Returns true if the given character could appear in an identifier. 422 static bool isIdentifierBodyChar(char c, const LangOptions &LangOpts); 423 424 /// getCharAndSizeNoWarn - Like the getCharAndSize method, but does not ever 425 /// emit a warning. 426 static inline char getCharAndSizeNoWarn(const char *Ptr, unsigned &Size, 427 const LangOptions &LangOpts) { 428 // If this is not a trigraph and not a UCN or escaped newline, return 429 // quickly. 430 if (isObviouslySimpleCharacter(Ptr[0])) { 431 Size = 1; 432 return *Ptr; 433 } 434 435 Size = 0; 436 return getCharAndSizeSlowNoWarn(Ptr, Size, LangOpts); 437 } 438 439 //===--------------------------------------------------------------------===// 440 // Internal implementation interfaces. 441 private: 442 443 /// LexTokenInternal - Internal interface to lex a preprocessing token. Called 444 /// by Lex. 445 /// 446 void LexTokenInternal(Token &Result); 447 448 /// Given that a token begins with the Unicode character \p C, figure out 449 /// what kind of token it is and dispatch to the appropriate lexing helper 450 /// function. 451 void LexUnicode(Token &Result, uint32_t C, const char *CurPtr); 452 453 /// FormTokenWithChars - When we lex a token, we have identified a span 454 /// starting at BufferPtr, going to TokEnd that forms the token. This method 455 /// takes that range and assigns it to the token as its location and size. In 456 /// addition, since tokens cannot overlap, this also updates BufferPtr to be 457 /// TokEnd. 458 void FormTokenWithChars(Token &Result, const char *TokEnd, 459 tok::TokenKind Kind) { 460 unsigned TokLen = TokEnd-BufferPtr; 461 Result.setLength(TokLen); 462 Result.setLocation(getSourceLocation(BufferPtr, TokLen)); 463 Result.setKind(Kind); 464 BufferPtr = TokEnd; 465 } 466 467 /// isNextPPTokenLParen - Return 1 if the next unexpanded token will return a 468 /// tok::l_paren token, 0 if it is something else and 2 if there are no more 469 /// tokens in the buffer controlled by this lexer. 470 unsigned isNextPPTokenLParen(); 471 472 //===--------------------------------------------------------------------===// 473 // Lexer character reading interfaces. 474 475 // This lexer is built on two interfaces for reading characters, both of which 476 // automatically provide phase 1/2 translation. getAndAdvanceChar is used 477 // when we know that we will be reading a character from the input buffer and 478 // that this character will be part of the result token. This occurs in (f.e.) 479 // string processing, because we know we need to read until we find the 480 // closing '"' character. 481 // 482 // The second interface is the combination of getCharAndSize with 483 // ConsumeChar. getCharAndSize reads a phase 1/2 translated character, 484 // returning it and its size. If the lexer decides that this character is 485 // part of the current token, it calls ConsumeChar on it. This two stage 486 // approach allows us to emit diagnostics for characters (e.g. warnings about 487 // trigraphs), knowing that they only are emitted if the character is 488 // consumed. 489 490 /// isObviouslySimpleCharacter - Return true if the specified character is 491 /// obviously the same in translation phase 1 and translation phase 3. This 492 /// can return false for characters that end up being the same, but it will 493 /// never return true for something that needs to be mapped. 494 static bool isObviouslySimpleCharacter(char C) { 495 return C != '?' && C != '\\'; 496 } 497 498 /// getAndAdvanceChar - Read a single 'character' from the specified buffer, 499 /// advance over it, and return it. This is tricky in several cases. Here we 500 /// just handle the trivial case and fall-back to the non-inlined 501 /// getCharAndSizeSlow method to handle the hard case. 502 inline char getAndAdvanceChar(const char *&Ptr, Token &Tok) { 503 // If this is not a trigraph and not a UCN or escaped newline, return 504 // quickly. 505 if (isObviouslySimpleCharacter(Ptr[0])) return *Ptr++; 506 507 unsigned Size = 0; 508 char C = getCharAndSizeSlow(Ptr, Size, &Tok); 509 Ptr += Size; 510 return C; 511 } 512 513 /// ConsumeChar - When a character (identified by getCharAndSize) is consumed 514 /// and added to a given token, check to see if there are diagnostics that 515 /// need to be emitted or flags that need to be set on the token. If so, do 516 /// it. 517 const char *ConsumeChar(const char *Ptr, unsigned Size, Token &Tok) { 518 // Normal case, we consumed exactly one token. Just return it. 519 if (Size == 1) 520 return Ptr+Size; 521 522 // Otherwise, re-lex the character with a current token, allowing 523 // diagnostics to be emitted and flags to be set. 524 Size = 0; 525 getCharAndSizeSlow(Ptr, Size, &Tok); 526 return Ptr+Size; 527 } 528 529 /// getCharAndSize - Peek a single 'character' from the specified buffer, 530 /// get its size, and return it. This is tricky in several cases. Here we 531 /// just handle the trivial case and fall-back to the non-inlined 532 /// getCharAndSizeSlow method to handle the hard case. 533 inline char getCharAndSize(const char *Ptr, unsigned &Size) { 534 // If this is not a trigraph and not a UCN or escaped newline, return 535 // quickly. 536 if (isObviouslySimpleCharacter(Ptr[0])) { 537 Size = 1; 538 return *Ptr; 539 } 540 541 Size = 0; 542 return getCharAndSizeSlow(Ptr, Size); 543 } 544 545 /// getCharAndSizeSlow - Handle the slow/uncommon case of the getCharAndSize 546 /// method. 547 char getCharAndSizeSlow(const char *Ptr, unsigned &Size, Token *Tok = 0); 548 549 /// getEscapedNewLineSize - Return the size of the specified escaped newline, 550 /// or 0 if it is not an escaped newline. P[-1] is known to be a "\" on entry 551 /// to this function. 552 static unsigned getEscapedNewLineSize(const char *P); 553 554 /// SkipEscapedNewLines - If P points to an escaped newline (or a series of 555 /// them), skip over them and return the first non-escaped-newline found, 556 /// otherwise return P. 557 static const char *SkipEscapedNewLines(const char *P); 558 559 /// getCharAndSizeSlowNoWarn - Same as getCharAndSizeSlow, but never emits a 560 /// diagnostic. 561 static char getCharAndSizeSlowNoWarn(const char *Ptr, unsigned &Size, 562 const LangOptions &LangOpts); 563 564 //===--------------------------------------------------------------------===// 565 // Other lexer functions. 566 567 void SkipBytes(unsigned Bytes, bool StartOfLine); 568 569 const char *LexUDSuffix(Token &Result, const char *CurPtr); 570 571 // Helper functions to lex the remainder of a token of the specific type. 572 void LexIdentifier (Token &Result, const char *CurPtr); 573 void LexNumericConstant (Token &Result, const char *CurPtr); 574 void LexStringLiteral (Token &Result, const char *CurPtr, 575 tok::TokenKind Kind); 576 void LexRawStringLiteral (Token &Result, const char *CurPtr, 577 tok::TokenKind Kind); 578 void LexAngledStringLiteral(Token &Result, const char *CurPtr); 579 void LexCharConstant (Token &Result, const char *CurPtr, 580 tok::TokenKind Kind); 581 bool LexEndOfFile (Token &Result, const char *CurPtr); 582 583 bool SkipWhitespace (Token &Result, const char *CurPtr); 584 bool SkipLineComment (Token &Result, const char *CurPtr); 585 bool SkipBlockComment (Token &Result, const char *CurPtr); 586 bool SaveLineComment (Token &Result, const char *CurPtr); 587 588 bool IsStartOfConflictMarker(const char *CurPtr); 589 bool HandleEndOfConflictMarker(const char *CurPtr); 590 591 bool isCodeCompletionPoint(const char *CurPtr) const; 592 void cutOffLexing() { BufferPtr = BufferEnd; } 593 594 bool isHexaLiteral(const char *Start, const LangOptions &LangOpts); 595 596 597 /// Read a universal character name. 598 /// 599 /// \param CurPtr The position in the source buffer after the initial '\'. 600 /// If the UCN is syntactically well-formed (but not necessarily 601 /// valid), this parameter will be updated to point to the 602 /// character after the UCN. 603 /// \param SlashLoc The position in the source buffer of the '\'. 604 /// \param Tok The token being formed. Pass \c NULL to suppress diagnostics 605 /// and handle token formation in the caller. 606 /// 607 /// \return The Unicode codepoint specified by the UCN, or 0 if the UCN is 608 /// invalid. 609 uint32_t tryReadUCN(const char *&CurPtr, const char *SlashLoc, Token *Tok); 610 }; 611 612 613 } // end namespace clang 614 615 #endif 616