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Diffstat (limited to 'include/clang/Lex/Lexer.h')
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diff --git a/include/clang/Lex/Lexer.h b/include/clang/Lex/Lexer.h deleted file mode 100644 index 12565d0..0000000 --- a/include/clang/Lex/Lexer.h +++ /dev/null @@ -1,665 +0,0 @@ -//===--- Lexer.h - C Language Family Lexer ----------------------*- C++ -*-===// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file defines the Lexer interface. -// -//===----------------------------------------------------------------------===// - -#ifndef LLVM_CLANG_LEX_LEXER_H -#define LLVM_CLANG_LEX_LEXER_H - -#include "clang/Basic/LangOptions.h" -#include "clang/Lex/PreprocessorLexer.h" -#include "llvm/ADT/SmallVector.h" -#include <cassert> -#include <string> - -namespace clang { -class DiagnosticsEngine; -class SourceManager; -class Preprocessor; -class DiagnosticBuilder; - -/// ConflictMarkerKind - Kinds of conflict marker which the lexer might be -/// recovering from. -enum ConflictMarkerKind { - /// Not within a conflict marker. - CMK_None, - /// A normal or diff3 conflict marker, initiated by at least 7 "<"s, - /// separated by at least 7 "="s or "|"s, and terminated by at least 7 ">"s. - CMK_Normal, - /// A Perforce-style conflict marker, initiated by 4 ">"s, - /// separated by 4 "="s, and terminated by 4 "<"s. - CMK_Perforce -}; - -/// Lexer - This provides a simple interface that turns a text buffer into a -/// stream of tokens. This provides no support for file reading or buffering, -/// or buffering/seeking of tokens, only forward lexing is supported. It relies -/// on the specified Preprocessor object to handle preprocessor directives, etc. -class Lexer : public PreprocessorLexer { - void anchor() override; - - //===--------------------------------------------------------------------===// - // Constant configuration values for this lexer. - const char *BufferStart; // Start of the buffer. - const char *BufferEnd; // End of the buffer. - SourceLocation FileLoc; // Location for start of file. - LangOptions LangOpts; // LangOpts enabled by this language (cache). - bool Is_PragmaLexer; // True if lexer for _Pragma handling. - - //===--------------------------------------------------------------------===// - // Context-specific lexing flags set by the preprocessor. - // - - /// ExtendedTokenMode - The lexer can optionally keep comments and whitespace - /// and return them as tokens. This is used for -C and -CC modes, and - /// whitespace preservation can be useful for some clients that want to lex - /// the file in raw mode and get every character from the file. - /// - /// When this is set to 2 it returns comments and whitespace. When set to 1 - /// it returns comments, when it is set to 0 it returns normal tokens only. - unsigned char ExtendedTokenMode; - - //===--------------------------------------------------------------------===// - // Context that changes as the file is lexed. - // NOTE: any state that mutates when in raw mode must have save/restore code - // in Lexer::isNextPPTokenLParen. - - // BufferPtr - Current pointer into the buffer. This is the next character - // to be lexed. - const char *BufferPtr; - - // IsAtStartOfLine - True if the next lexed token should get the "start of - // line" flag set on it. - bool IsAtStartOfLine; - - bool IsAtPhysicalStartOfLine; - - bool HasLeadingSpace; - - bool HasLeadingEmptyMacro; - - // CurrentConflictMarkerState - The kind of conflict marker we are handling. - ConflictMarkerKind CurrentConflictMarkerState; - - Lexer(const Lexer &) = delete; - void operator=(const Lexer &) = delete; - friend class Preprocessor; - - void InitLexer(const char *BufStart, const char *BufPtr, const char *BufEnd); -public: - - /// Lexer constructor - Create a new lexer object for the specified buffer - /// with the specified preprocessor managing the lexing process. This lexer - /// assumes that the associated file buffer and Preprocessor objects will - /// outlive it, so it doesn't take ownership of either of them. - Lexer(FileID FID, const llvm::MemoryBuffer *InputBuffer, Preprocessor &PP); - - /// Lexer constructor - Create a new raw lexer object. This object is only - /// suitable for calls to 'LexFromRawLexer'. This lexer assumes that the - /// text range will outlive it, so it doesn't take ownership of it. - Lexer(SourceLocation FileLoc, const LangOptions &LangOpts, - const char *BufStart, const char *BufPtr, const char *BufEnd); - - /// Lexer constructor - Create a new raw lexer object. This object is only - /// suitable for calls to 'LexFromRawLexer'. This lexer assumes that the - /// text range will outlive it, so it doesn't take ownership of it. - Lexer(FileID FID, const llvm::MemoryBuffer *InputBuffer, - const SourceManager &SM, const LangOptions &LangOpts); - - /// Create_PragmaLexer: Lexer constructor - Create a new lexer object for - /// _Pragma expansion. This has a variety of magic semantics that this method - /// sets up. It returns a new'd Lexer that must be delete'd when done. - static Lexer *Create_PragmaLexer(SourceLocation SpellingLoc, - SourceLocation ExpansionLocStart, - SourceLocation ExpansionLocEnd, - unsigned TokLen, Preprocessor &PP); - - - /// getLangOpts - Return the language features currently enabled. - /// NOTE: this lexer modifies features as a file is parsed! - const LangOptions &getLangOpts() const { return LangOpts; } - - /// getFileLoc - Return the File Location for the file we are lexing out of. - /// The physical location encodes the location where the characters come from, - /// the virtual location encodes where we should *claim* the characters came - /// from. Currently this is only used by _Pragma handling. - SourceLocation getFileLoc() const { return FileLoc; } - -private: - /// Lex - Return the next token in the file. If this is the end of file, it - /// return the tok::eof token. This implicitly involves the preprocessor. - bool Lex(Token &Result); - -public: - /// isPragmaLexer - Returns true if this Lexer is being used to lex a pragma. - bool isPragmaLexer() const { return Is_PragmaLexer; } - -private: - /// IndirectLex - An indirect call to 'Lex' that can be invoked via - /// the PreprocessorLexer interface. - void IndirectLex(Token &Result) override { Lex(Result); } - -public: - /// LexFromRawLexer - Lex a token from a designated raw lexer (one with no - /// associated preprocessor object. Return true if the 'next character to - /// read' pointer points at the end of the lexer buffer, false otherwise. - bool LexFromRawLexer(Token &Result) { - assert(LexingRawMode && "Not already in raw mode!"); - Lex(Result); - // Note that lexing to the end of the buffer doesn't implicitly delete the - // lexer when in raw mode. - return BufferPtr == BufferEnd; - } - - /// isKeepWhitespaceMode - Return true if the lexer should return tokens for - /// every character in the file, including whitespace and comments. This - /// should only be used in raw mode, as the preprocessor is not prepared to - /// deal with the excess tokens. - bool isKeepWhitespaceMode() const { - return ExtendedTokenMode > 1; - } - - /// SetKeepWhitespaceMode - This method lets clients enable or disable - /// whitespace retention mode. - void SetKeepWhitespaceMode(bool Val) { - assert((!Val || LexingRawMode || LangOpts.TraditionalCPP) && - "Can only retain whitespace in raw mode or -traditional-cpp"); - ExtendedTokenMode = Val ? 2 : 0; - } - - /// inKeepCommentMode - Return true if the lexer should return comments as - /// tokens. - bool inKeepCommentMode() const { - return ExtendedTokenMode > 0; - } - - /// SetCommentRetentionMode - Change the comment retention mode of the lexer - /// to the specified mode. This is really only useful when lexing in raw - /// mode, because otherwise the lexer needs to manage this. - void SetCommentRetentionState(bool Mode) { - assert(!isKeepWhitespaceMode() && - "Can't play with comment retention state when retaining whitespace"); - ExtendedTokenMode = Mode ? 1 : 0; - } - - /// Sets the extended token mode back to its initial value, according to the - /// language options and preprocessor. This controls whether the lexer - /// produces comment and whitespace tokens. - /// - /// This requires the lexer to have an associated preprocessor. A standalone - /// lexer has nothing to reset to. - void resetExtendedTokenMode(); - - /// Gets source code buffer. - StringRef getBuffer() const { - return StringRef(BufferStart, BufferEnd - BufferStart); - } - - /// ReadToEndOfLine - Read the rest of the current preprocessor line as an - /// uninterpreted string. This switches the lexer out of directive mode. - void ReadToEndOfLine(SmallVectorImpl<char> *Result = nullptr); - - - /// Diag - Forwarding function for diagnostics. This translate a source - /// position in the current buffer into a SourceLocation object for rendering. - DiagnosticBuilder Diag(const char *Loc, unsigned DiagID) const; - - /// getSourceLocation - Return a source location identifier for the specified - /// offset in the current file. - SourceLocation getSourceLocation(const char *Loc, unsigned TokLen = 1) const; - - /// getSourceLocation - Return a source location for the next character in - /// the current file. - SourceLocation getSourceLocation() override { - return getSourceLocation(BufferPtr); - } - - /// \brief Return the current location in the buffer. - const char *getBufferLocation() const { return BufferPtr; } - - /// Stringify - Convert the specified string into a C string by escaping '\' - /// and " characters. This does not add surrounding ""'s to the string. - /// If Charify is true, this escapes the ' character instead of ". - static std::string Stringify(StringRef Str, bool Charify = false); - - /// Stringify - Convert the specified string into a C string by escaping '\' - /// and " characters. This does not add surrounding ""'s to the string. - static void Stringify(SmallVectorImpl<char> &Str); - - - /// getSpelling - This method is used to get the spelling of a token into a - /// preallocated buffer, instead of as an std::string. The caller is required - /// to allocate enough space for the token, which is guaranteed to be at least - /// Tok.getLength() bytes long. The length of the actual result is returned. - /// - /// Note that this method may do two possible things: it may either fill in - /// the buffer specified with characters, or it may *change the input pointer* - /// to point to a constant buffer with the data already in it (avoiding a - /// copy). The caller is not allowed to modify the returned buffer pointer - /// if an internal buffer is returned. - static unsigned getSpelling(const Token &Tok, const char *&Buffer, - const SourceManager &SourceMgr, - const LangOptions &LangOpts, - bool *Invalid = nullptr); - - /// getSpelling() - Return the 'spelling' of the Tok token. The spelling of a - /// token is the characters used to represent the token in the source file - /// after trigraph expansion and escaped-newline folding. In particular, this - /// wants to get the true, uncanonicalized, spelling of things like digraphs - /// UCNs, etc. - static std::string getSpelling(const Token &Tok, - const SourceManager &SourceMgr, - const LangOptions &LangOpts, - bool *Invalid = nullptr); - - /// getSpelling - This method is used to get the spelling of the - /// token at the given source location. If, as is usually true, it - /// is not necessary to copy any data, then the returned string may - /// not point into the provided buffer. - /// - /// This method lexes at the expansion depth of the given - /// location and does not jump to the expansion or spelling - /// location. - static StringRef getSpelling(SourceLocation loc, - SmallVectorImpl<char> &buffer, - const SourceManager &SourceMgr, - const LangOptions &LangOpts, - bool *invalid = nullptr); - - /// MeasureTokenLength - Relex the token at the specified location and return - /// its length in bytes in the input file. If the token needs cleaning (e.g. - /// includes a trigraph or an escaped newline) then this count includes bytes - /// that are part of that. - static unsigned MeasureTokenLength(SourceLocation Loc, - const SourceManager &SM, - const LangOptions &LangOpts); - - /// \brief Relex the token at the specified location. - /// \returns true if there was a failure, false on success. - static bool getRawToken(SourceLocation Loc, Token &Result, - const SourceManager &SM, - const LangOptions &LangOpts, - bool IgnoreWhiteSpace = false); - - /// \brief Given a location any where in a source buffer, find the location - /// that corresponds to the beginning of the token in which the original - /// source location lands. - static SourceLocation GetBeginningOfToken(SourceLocation Loc, - const SourceManager &SM, - const LangOptions &LangOpts); - - /// AdvanceToTokenCharacter - If the current SourceLocation specifies a - /// location at the start of a token, return a new location that specifies a - /// character within the token. This handles trigraphs and escaped newlines. - static SourceLocation AdvanceToTokenCharacter(SourceLocation TokStart, - unsigned Character, - const SourceManager &SM, - const LangOptions &LangOpts); - - /// \brief Computes the source location just past the end of the - /// token at this source location. - /// - /// This routine can be used to produce a source location that - /// points just past the end of the token referenced by \p Loc, and - /// is generally used when a diagnostic needs to point just after a - /// token where it expected something different that it received. If - /// the returned source location would not be meaningful (e.g., if - /// it points into a macro), this routine returns an invalid - /// source location. - /// - /// \param Offset an offset from the end of the token, where the source - /// location should refer to. The default offset (0) produces a source - /// location pointing just past the end of the token; an offset of 1 produces - /// a source location pointing to the last character in the token, etc. - static SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset, - const SourceManager &SM, - const LangOptions &LangOpts); - - /// \brief Given a token range, produce a corresponding CharSourceRange that - /// is not a token range. This allows the source range to be used by - /// components that don't have access to the lexer and thus can't find the - /// end of the range for themselves. - static CharSourceRange getAsCharRange(SourceRange Range, - const SourceManager &SM, - const LangOptions &LangOpts) { - SourceLocation End = getLocForEndOfToken(Range.getEnd(), 0, SM, LangOpts); - return End.isInvalid() ? CharSourceRange() - : CharSourceRange::getCharRange( - Range.getBegin(), End.getLocWithOffset(-1)); - } - static CharSourceRange getAsCharRange(CharSourceRange Range, - const SourceManager &SM, - const LangOptions &LangOpts) { - return Range.isTokenRange() - ? getAsCharRange(Range.getAsRange(), SM, LangOpts) - : Range; - } - - /// \brief Returns true if the given MacroID location points at the first - /// token of the macro expansion. - /// - /// \param MacroBegin If non-null and function returns true, it is set to - /// begin location of the macro. - static bool isAtStartOfMacroExpansion(SourceLocation loc, - const SourceManager &SM, - const LangOptions &LangOpts, - SourceLocation *MacroBegin = nullptr); - - /// \brief Returns true if the given MacroID location points at the last - /// token of the macro expansion. - /// - /// \param MacroEnd If non-null and function returns true, it is set to - /// end location of the macro. - static bool isAtEndOfMacroExpansion(SourceLocation loc, - const SourceManager &SM, - const LangOptions &LangOpts, - SourceLocation *MacroEnd = nullptr); - - /// \brief Accepts a range and returns a character range with file locations. - /// - /// Returns a null range if a part of the range resides inside a macro - /// expansion or the range does not reside on the same FileID. - /// - /// This function is trying to deal with macros and return a range based on - /// file locations. The cases where it can successfully handle macros are: - /// - /// -begin or end range lies at the start or end of a macro expansion, in - /// which case the location will be set to the expansion point, e.g: - /// \#define M 1 2 - /// a M - /// If you have a range [a, 2] (where 2 came from the macro), the function - /// will return a range for "a M" - /// if you have range [a, 1], the function will fail because the range - /// overlaps with only a part of the macro - /// - /// -The macro is a function macro and the range can be mapped to the macro - /// arguments, e.g: - /// \#define M 1 2 - /// \#define FM(x) x - /// FM(a b M) - /// if you have range [b, 2], the function will return the file range "b M" - /// inside the macro arguments. - /// if you have range [a, 2], the function will return the file range - /// "FM(a b M)" since the range includes all of the macro expansion. - static CharSourceRange makeFileCharRange(CharSourceRange Range, - const SourceManager &SM, - const LangOptions &LangOpts); - - /// \brief Returns a string for the source that the range encompasses. - static StringRef getSourceText(CharSourceRange Range, - const SourceManager &SM, - const LangOptions &LangOpts, - bool *Invalid = nullptr); - - /// \brief Retrieve the name of the immediate macro expansion. - /// - /// This routine starts from a source location, and finds the name of the macro - /// responsible for its immediate expansion. It looks through any intervening - /// macro argument expansions to compute this. It returns a StringRef which - /// refers to the SourceManager-owned buffer of the source where that macro - /// name is spelled. Thus, the result shouldn't out-live that SourceManager. - static StringRef getImmediateMacroName(SourceLocation Loc, - const SourceManager &SM, - const LangOptions &LangOpts); - - /// \brief Compute the preamble of the given file. - /// - /// The preamble of a file contains the initial comments, include directives, - /// and other preprocessor directives that occur before the code in this - /// particular file actually begins. The preamble of the main source file is - /// a potential prefix header. - /// - /// \param Buffer The memory buffer containing the file's contents. - /// - /// \param MaxLines If non-zero, restrict the length of the preamble - /// to fewer than this number of lines. - /// - /// \returns The offset into the file where the preamble ends and the rest - /// of the file begins along with a boolean value indicating whether - /// the preamble ends at the beginning of a new line. - static std::pair<unsigned, bool> ComputePreamble(StringRef Buffer, - const LangOptions &LangOpts, - unsigned MaxLines = 0); - - /// \brief Checks that the given token is the first token that occurs after - /// the given location (this excludes comments and whitespace). Returns the - /// location immediately after the specified token. If the token is not found - /// or the location is inside a macro, the returned source location will be - /// invalid. - static SourceLocation findLocationAfterToken(SourceLocation loc, - tok::TokenKind TKind, - const SourceManager &SM, - const LangOptions &LangOpts, - bool SkipTrailingWhitespaceAndNewLine); - - /// \brief Returns true if the given character could appear in an identifier. - static bool isIdentifierBodyChar(char c, const LangOptions &LangOpts); - - /// getCharAndSizeNoWarn - Like the getCharAndSize method, but does not ever - /// emit a warning. - static inline char getCharAndSizeNoWarn(const char *Ptr, unsigned &Size, - const LangOptions &LangOpts) { - // If this is not a trigraph and not a UCN or escaped newline, return - // quickly. - if (isObviouslySimpleCharacter(Ptr[0])) { - Size = 1; - return *Ptr; - } - - Size = 0; - return getCharAndSizeSlowNoWarn(Ptr, Size, LangOpts); - } - - //===--------------------------------------------------------------------===// - // Internal implementation interfaces. -private: - - /// LexTokenInternal - Internal interface to lex a preprocessing token. Called - /// by Lex. - /// - bool LexTokenInternal(Token &Result, bool TokAtPhysicalStartOfLine); - - bool CheckUnicodeWhitespace(Token &Result, uint32_t C, const char *CurPtr); - - /// Given that a token begins with the Unicode character \p C, figure out - /// what kind of token it is and dispatch to the appropriate lexing helper - /// function. - bool LexUnicode(Token &Result, uint32_t C, const char *CurPtr); - - /// FormTokenWithChars - When we lex a token, we have identified a span - /// starting at BufferPtr, going to TokEnd that forms the token. This method - /// takes that range and assigns it to the token as its location and size. In - /// addition, since tokens cannot overlap, this also updates BufferPtr to be - /// TokEnd. - void FormTokenWithChars(Token &Result, const char *TokEnd, - tok::TokenKind Kind) { - unsigned TokLen = TokEnd-BufferPtr; - Result.setLength(TokLen); - Result.setLocation(getSourceLocation(BufferPtr, TokLen)); - Result.setKind(Kind); - BufferPtr = TokEnd; - } - - /// isNextPPTokenLParen - Return 1 if the next unexpanded token will return a - /// tok::l_paren token, 0 if it is something else and 2 if there are no more - /// tokens in the buffer controlled by this lexer. - unsigned isNextPPTokenLParen(); - - //===--------------------------------------------------------------------===// - // Lexer character reading interfaces. - - // This lexer is built on two interfaces for reading characters, both of which - // automatically provide phase 1/2 translation. getAndAdvanceChar is used - // when we know that we will be reading a character from the input buffer and - // that this character will be part of the result token. This occurs in (f.e.) - // string processing, because we know we need to read until we find the - // closing '"' character. - // - // The second interface is the combination of getCharAndSize with - // ConsumeChar. getCharAndSize reads a phase 1/2 translated character, - // returning it and its size. If the lexer decides that this character is - // part of the current token, it calls ConsumeChar on it. This two stage - // approach allows us to emit diagnostics for characters (e.g. warnings about - // trigraphs), knowing that they only are emitted if the character is - // consumed. - - /// isObviouslySimpleCharacter - Return true if the specified character is - /// obviously the same in translation phase 1 and translation phase 3. This - /// can return false for characters that end up being the same, but it will - /// never return true for something that needs to be mapped. - static bool isObviouslySimpleCharacter(char C) { - return C != '?' && C != '\\'; - } - - /// getAndAdvanceChar - Read a single 'character' from the specified buffer, - /// advance over it, and return it. This is tricky in several cases. Here we - /// just handle the trivial case and fall-back to the non-inlined - /// getCharAndSizeSlow method to handle the hard case. - inline char getAndAdvanceChar(const char *&Ptr, Token &Tok) { - // If this is not a trigraph and not a UCN or escaped newline, return - // quickly. - if (isObviouslySimpleCharacter(Ptr[0])) return *Ptr++; - - unsigned Size = 0; - char C = getCharAndSizeSlow(Ptr, Size, &Tok); - Ptr += Size; - return C; - } - - /// ConsumeChar - When a character (identified by getCharAndSize) is consumed - /// and added to a given token, check to see if there are diagnostics that - /// need to be emitted or flags that need to be set on the token. If so, do - /// it. - const char *ConsumeChar(const char *Ptr, unsigned Size, Token &Tok) { - // Normal case, we consumed exactly one token. Just return it. - if (Size == 1) - return Ptr+Size; - - // Otherwise, re-lex the character with a current token, allowing - // diagnostics to be emitted and flags to be set. - Size = 0; - getCharAndSizeSlow(Ptr, Size, &Tok); - return Ptr+Size; - } - - /// getCharAndSize - Peek a single 'character' from the specified buffer, - /// get its size, and return it. This is tricky in several cases. Here we - /// just handle the trivial case and fall-back to the non-inlined - /// getCharAndSizeSlow method to handle the hard case. - inline char getCharAndSize(const char *Ptr, unsigned &Size) { - // If this is not a trigraph and not a UCN or escaped newline, return - // quickly. - if (isObviouslySimpleCharacter(Ptr[0])) { - Size = 1; - return *Ptr; - } - - Size = 0; - return getCharAndSizeSlow(Ptr, Size); - } - - /// getCharAndSizeSlow - Handle the slow/uncommon case of the getCharAndSize - /// method. - char getCharAndSizeSlow(const char *Ptr, unsigned &Size, - Token *Tok = nullptr); - - /// getEscapedNewLineSize - Return the size of the specified escaped newline, - /// or 0 if it is not an escaped newline. P[-1] is known to be a "\" on entry - /// to this function. - static unsigned getEscapedNewLineSize(const char *P); - - /// SkipEscapedNewLines - If P points to an escaped newline (or a series of - /// them), skip over them and return the first non-escaped-newline found, - /// otherwise return P. - static const char *SkipEscapedNewLines(const char *P); - - /// getCharAndSizeSlowNoWarn - Same as getCharAndSizeSlow, but never emits a - /// diagnostic. - static char getCharAndSizeSlowNoWarn(const char *Ptr, unsigned &Size, - const LangOptions &LangOpts); - - //===--------------------------------------------------------------------===// - // Other lexer functions. - - void SkipBytes(unsigned Bytes, bool StartOfLine); - - void PropagateLineStartLeadingSpaceInfo(Token &Result); - - const char *LexUDSuffix(Token &Result, const char *CurPtr, - bool IsStringLiteral); - - // Helper functions to lex the remainder of a token of the specific type. - bool LexIdentifier (Token &Result, const char *CurPtr); - bool LexNumericConstant (Token &Result, const char *CurPtr); - bool LexStringLiteral (Token &Result, const char *CurPtr, - tok::TokenKind Kind); - bool LexRawStringLiteral (Token &Result, const char *CurPtr, - tok::TokenKind Kind); - bool LexAngledStringLiteral(Token &Result, const char *CurPtr); - bool LexCharConstant (Token &Result, const char *CurPtr, - tok::TokenKind Kind); - bool LexEndOfFile (Token &Result, const char *CurPtr); - bool SkipWhitespace (Token &Result, const char *CurPtr, - bool &TokAtPhysicalStartOfLine); - bool SkipLineComment (Token &Result, const char *CurPtr, - bool &TokAtPhysicalStartOfLine); - bool SkipBlockComment (Token &Result, const char *CurPtr, - bool &TokAtPhysicalStartOfLine); - bool SaveLineComment (Token &Result, const char *CurPtr); - - bool IsStartOfConflictMarker(const char *CurPtr); - bool HandleEndOfConflictMarker(const char *CurPtr); - - bool isCodeCompletionPoint(const char *CurPtr) const; - void cutOffLexing() { BufferPtr = BufferEnd; } - - bool isHexaLiteral(const char *Start, const LangOptions &LangOpts); - - - /// Read a universal character name. - /// - /// \param CurPtr The position in the source buffer after the initial '\'. - /// If the UCN is syntactically well-formed (but not necessarily - /// valid), this parameter will be updated to point to the - /// character after the UCN. - /// \param SlashLoc The position in the source buffer of the '\'. - /// \param Tok The token being formed. Pass \c NULL to suppress diagnostics - /// and handle token formation in the caller. - /// - /// \return The Unicode codepoint specified by the UCN, or 0 if the UCN is - /// invalid. - uint32_t tryReadUCN(const char *&CurPtr, const char *SlashLoc, Token *Tok); - - /// \brief Try to consume a UCN as part of an identifier at the current - /// location. - /// \param CurPtr Initially points to the range of characters in the source - /// buffer containing the '\'. Updated to point past the end of - /// the UCN on success. - /// \param Size The number of characters occupied by the '\' (including - /// trigraphs and escaped newlines). - /// \param Result The token being produced. Marked as containing a UCN on - /// success. - /// \return \c true if a UCN was lexed and it produced an acceptable - /// identifier character, \c false otherwise. - bool tryConsumeIdentifierUCN(const char *&CurPtr, unsigned Size, - Token &Result); - - /// \brief Try to consume an identifier character encoded in UTF-8. - /// \param CurPtr Points to the start of the (potential) UTF-8 code unit - /// sequence. On success, updated to point past the end of it. - /// \return \c true if a UTF-8 sequence mapping to an acceptable identifier - /// character was lexed, \c false otherwise. - bool tryConsumeIdentifierUTF8Char(const char *&CurPtr); -}; - -} // end namespace clang - -#endif |
