| //===--- LiteralSupport.cpp - Code to parse and process literals ----------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the NumericLiteralParser, CharLiteralParser, and |
| // StringLiteralParser interfaces. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "clang/Lex/LiteralSupport.h" |
| #include "clang/Lex/Preprocessor.h" |
| #include "clang/Lex/LexDiagnostic.h" |
| #include "clang/Basic/TargetInfo.h" |
| #include "clang/Basic/ConvertUTF.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/Support/ErrorHandling.h" |
| using namespace clang; |
| |
| /// HexDigitValue - Return the value of the specified hex digit, or -1 if it's |
| /// not valid. |
| static int HexDigitValue(char C) { |
| if (C >= '0' && C <= '9') return C-'0'; |
| if (C >= 'a' && C <= 'f') return C-'a'+10; |
| if (C >= 'A' && C <= 'F') return C-'A'+10; |
| return -1; |
| } |
| |
| static unsigned getCharWidth(tok::TokenKind kind, const TargetInfo &Target) { |
| switch (kind) { |
| default: llvm_unreachable("Unknown token type!"); |
| case tok::char_constant: |
| case tok::string_literal: |
| case tok::utf8_string_literal: |
| return Target.getCharWidth(); |
| case tok::wide_char_constant: |
| case tok::wide_string_literal: |
| return Target.getWCharWidth(); |
| case tok::utf16_char_constant: |
| case tok::utf16_string_literal: |
| return Target.getChar16Width(); |
| case tok::utf32_char_constant: |
| case tok::utf32_string_literal: |
| return Target.getChar32Width(); |
| } |
| } |
| |
| static CharSourceRange MakeCharSourceRange(const LangOptions &Features, |
| FullSourceLoc TokLoc, |
| const char *TokBegin, |
| const char *TokRangeBegin, |
| const char *TokRangeEnd) { |
| SourceLocation Begin = |
| Lexer::AdvanceToTokenCharacter(TokLoc, TokRangeBegin - TokBegin, |
| TokLoc.getManager(), Features); |
| SourceLocation End = |
| Lexer::AdvanceToTokenCharacter(Begin, TokRangeEnd - TokRangeBegin, |
| TokLoc.getManager(), Features); |
| return CharSourceRange::getCharRange(Begin, End); |
| } |
| |
| /// \brief Produce a diagnostic highlighting some portion of a literal. |
| /// |
| /// Emits the diagnostic \p DiagID, highlighting the range of characters from |
| /// \p TokRangeBegin (inclusive) to \p TokRangeEnd (exclusive), which must be |
| /// a substring of a spelling buffer for the token beginning at \p TokBegin. |
| static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, |
| const LangOptions &Features, FullSourceLoc TokLoc, |
| const char *TokBegin, const char *TokRangeBegin, |
| const char *TokRangeEnd, unsigned DiagID) { |
| SourceLocation Begin = |
| Lexer::AdvanceToTokenCharacter(TokLoc, TokRangeBegin - TokBegin, |
| TokLoc.getManager(), Features); |
| return Diags->Report(Begin, DiagID) << |
| MakeCharSourceRange(Features, TokLoc, TokBegin, TokRangeBegin, TokRangeEnd); |
| } |
| |
| /// ProcessCharEscape - Parse a standard C escape sequence, which can occur in |
| /// either a character or a string literal. |
| static unsigned ProcessCharEscape(const char *ThisTokBegin, |
| const char *&ThisTokBuf, |
| const char *ThisTokEnd, bool &HadError, |
| FullSourceLoc Loc, unsigned CharWidth, |
| DiagnosticsEngine *Diags, |
| const LangOptions &Features) { |
| const char *EscapeBegin = ThisTokBuf; |
| |
| // Skip the '\' char. |
| ++ThisTokBuf; |
| |
| // We know that this character can't be off the end of the buffer, because |
| // that would have been \", which would not have been the end of string. |
| unsigned ResultChar = *ThisTokBuf++; |
| switch (ResultChar) { |
| // These map to themselves. |
| case '\\': case '\'': case '"': case '?': break; |
| |
| // These have fixed mappings. |
| case 'a': |
| // TODO: K&R: the meaning of '\\a' is different in traditional C |
| ResultChar = 7; |
| break; |
| case 'b': |
| ResultChar = 8; |
| break; |
| case 'e': |
| if (Diags) |
| Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, |
| diag::ext_nonstandard_escape) << "e"; |
| ResultChar = 27; |
| break; |
| case 'E': |
| if (Diags) |
| Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, |
| diag::ext_nonstandard_escape) << "E"; |
| ResultChar = 27; |
| break; |
| case 'f': |
| ResultChar = 12; |
| break; |
| case 'n': |
| ResultChar = 10; |
| break; |
| case 'r': |
| ResultChar = 13; |
| break; |
| case 't': |
| ResultChar = 9; |
| break; |
| case 'v': |
| ResultChar = 11; |
| break; |
| case 'x': { // Hex escape. |
| ResultChar = 0; |
| if (ThisTokBuf == ThisTokEnd || !isxdigit(*ThisTokBuf)) { |
| if (Diags) |
| Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, |
| diag::err_hex_escape_no_digits); |
| HadError = 1; |
| break; |
| } |
| |
| // Hex escapes are a maximal series of hex digits. |
| bool Overflow = false; |
| for (; ThisTokBuf != ThisTokEnd; ++ThisTokBuf) { |
| int CharVal = HexDigitValue(ThisTokBuf[0]); |
| if (CharVal == -1) break; |
| // About to shift out a digit? |
| Overflow |= (ResultChar & 0xF0000000) ? true : false; |
| ResultChar <<= 4; |
| ResultChar |= CharVal; |
| } |
| |
| // See if any bits will be truncated when evaluated as a character. |
| if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) { |
| Overflow = true; |
| ResultChar &= ~0U >> (32-CharWidth); |
| } |
| |
| // Check for overflow. |
| if (Overflow && Diags) // Too many digits to fit in |
| Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, |
| diag::warn_hex_escape_too_large); |
| break; |
| } |
| case '0': case '1': case '2': case '3': |
| case '4': case '5': case '6': case '7': { |
| // Octal escapes. |
| --ThisTokBuf; |
| ResultChar = 0; |
| |
| // Octal escapes are a series of octal digits with maximum length 3. |
| // "\0123" is a two digit sequence equal to "\012" "3". |
| unsigned NumDigits = 0; |
| do { |
| ResultChar <<= 3; |
| ResultChar |= *ThisTokBuf++ - '0'; |
| ++NumDigits; |
| } while (ThisTokBuf != ThisTokEnd && NumDigits < 3 && |
| ThisTokBuf[0] >= '0' && ThisTokBuf[0] <= '7'); |
| |
| // Check for overflow. Reject '\777', but not L'\777'. |
| if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) { |
| if (Diags) |
| Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, |
| diag::warn_octal_escape_too_large); |
| ResultChar &= ~0U >> (32-CharWidth); |
| } |
| break; |
| } |
| |
| // Otherwise, these are not valid escapes. |
| case '(': case '{': case '[': case '%': |
| // GCC accepts these as extensions. We warn about them as such though. |
| if (Diags) |
| Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, |
| diag::ext_nonstandard_escape) |
| << std::string(1, ResultChar); |
| break; |
| default: |
| if (Diags == 0) |
| break; |
| |
| if (isgraph(ResultChar)) |
| Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, |
| diag::ext_unknown_escape) |
| << std::string(1, ResultChar); |
| else |
| Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, |
| diag::ext_unknown_escape) |
| << "x" + llvm::utohexstr(ResultChar); |
| break; |
| } |
| |
| return ResultChar; |
| } |
| |
| /// ProcessUCNEscape - Read the Universal Character Name, check constraints and |
| /// return the UTF32. |
| static bool ProcessUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf, |
| const char *ThisTokEnd, |
| uint32_t &UcnVal, unsigned short &UcnLen, |
| FullSourceLoc Loc, DiagnosticsEngine *Diags, |
| const LangOptions &Features, |
| bool in_char_string_literal = false) { |
| const char *UcnBegin = ThisTokBuf; |
| |
| // Skip the '\u' char's. |
| ThisTokBuf += 2; |
| |
| if (ThisTokBuf == ThisTokEnd || !isxdigit(*ThisTokBuf)) { |
| if (Diags) |
| Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, |
| diag::err_ucn_escape_no_digits); |
| return false; |
| } |
| UcnLen = (ThisTokBuf[-1] == 'u' ? 4 : 8); |
| unsigned short UcnLenSave = UcnLen; |
| for (; ThisTokBuf != ThisTokEnd && UcnLenSave; ++ThisTokBuf, UcnLenSave--) { |
| int CharVal = HexDigitValue(ThisTokBuf[0]); |
| if (CharVal == -1) break; |
| UcnVal <<= 4; |
| UcnVal |= CharVal; |
| } |
| // If we didn't consume the proper number of digits, there is a problem. |
| if (UcnLenSave) { |
| if (Diags) |
| Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, |
| diag::err_ucn_escape_incomplete); |
| return false; |
| } |
| |
| // Check UCN constraints (C99 6.4.3p2) [C++11 lex.charset p2] |
| if ((0xD800 <= UcnVal && UcnVal <= 0xDFFF) || // surrogate codepoints |
| UcnVal > 0x10FFFF) { // maximum legal UTF32 value |
| if (Diags) |
| Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, |
| diag::err_ucn_escape_invalid); |
| return false; |
| } |
| |
| // C++11 allows UCNs that refer to control characters and basic source |
| // characters inside character and string literals |
| if (UcnVal < 0xa0 && |
| (UcnVal != 0x24 && UcnVal != 0x40 && UcnVal != 0x60)) { // $, @, ` |
| bool IsError = (!Features.CPlusPlus0x || !in_char_string_literal); |
| if (Diags) { |
| char BasicSCSChar = UcnVal; |
| if (UcnVal >= 0x20 && UcnVal < 0x7f) |
| Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, |
| IsError ? diag::err_ucn_escape_basic_scs : |
| diag::warn_cxx98_compat_literal_ucn_escape_basic_scs) |
| << StringRef(&BasicSCSChar, 1); |
| else |
| Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, |
| IsError ? diag::err_ucn_control_character : |
| diag::warn_cxx98_compat_literal_ucn_control_character); |
| } |
| if (IsError) |
| return false; |
| } |
| |
| if (!Features.CPlusPlus && !Features.C99 && Diags) |
| Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, |
| diag::warn_ucn_not_valid_in_c89); |
| |
| return true; |
| } |
| |
| /// MeasureUCNEscape - Determine the number of bytes within the resulting string |
| /// which this UCN will occupy. |
| static int MeasureUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf, |
| const char *ThisTokEnd, unsigned CharByteWidth, |
| const LangOptions &Features, bool &HadError) { |
| // UTF-32: 4 bytes per escape. |
| if (CharByteWidth == 4) |
| return 4; |
| |
| uint32_t UcnVal = 0; |
| unsigned short UcnLen = 0; |
| FullSourceLoc Loc; |
| |
| if (!ProcessUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, UcnVal, |
| UcnLen, Loc, 0, Features, true)) { |
| HadError = true; |
| return 0; |
| } |
| |
| // UTF-16: 2 bytes for BMP, 4 bytes otherwise. |
| if (CharByteWidth == 2) |
| return UcnVal <= 0xFFFF ? 2 : 4; |
| |
| // UTF-8. |
| if (UcnVal < 0x80) |
| return 1; |
| if (UcnVal < 0x800) |
| return 2; |
| if (UcnVal < 0x10000) |
| return 3; |
| return 4; |
| } |
| |
| /// EncodeUCNEscape - Read the Universal Character Name, check constraints and |
| /// convert the UTF32 to UTF8 or UTF16. This is a subroutine of |
| /// StringLiteralParser. When we decide to implement UCN's for identifiers, |
| /// we will likely rework our support for UCN's. |
| static void EncodeUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf, |
| const char *ThisTokEnd, |
| char *&ResultBuf, bool &HadError, |
| FullSourceLoc Loc, unsigned CharByteWidth, |
| DiagnosticsEngine *Diags, |
| const LangOptions &Features) { |
| typedef uint32_t UTF32; |
| UTF32 UcnVal = 0; |
| unsigned short UcnLen = 0; |
| if (!ProcessUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, UcnVal, UcnLen, |
| Loc, Diags, Features, true)) { |
| HadError = true; |
| return; |
| } |
| |
| assert((CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth) && |
| "only character widths of 1, 2, or 4 bytes supported"); |
| |
| (void)UcnLen; |
| assert((UcnLen== 4 || UcnLen== 8) && "only ucn length of 4 or 8 supported"); |
| |
| if (CharByteWidth == 4) { |
| // FIXME: Make the type of the result buffer correct instead of |
| // using reinterpret_cast. |
| UTF32 *ResultPtr = reinterpret_cast<UTF32*>(ResultBuf); |
| *ResultPtr = UcnVal; |
| ResultBuf += 4; |
| return; |
| } |
| |
| if (CharByteWidth == 2) { |
| // FIXME: Make the type of the result buffer correct instead of |
| // using reinterpret_cast. |
| UTF16 *ResultPtr = reinterpret_cast<UTF16*>(ResultBuf); |
| |
| if (UcnVal <= (UTF32)0xFFFF) { |
| *ResultPtr = UcnVal; |
| ResultBuf += 2; |
| return; |
| } |
| |
| // Convert to UTF16. |
| UcnVal -= 0x10000; |
| *ResultPtr = 0xD800 + (UcnVal >> 10); |
| *(ResultPtr+1) = 0xDC00 + (UcnVal & 0x3FF); |
| ResultBuf += 4; |
| return; |
| } |
| |
| assert(CharByteWidth == 1 && "UTF-8 encoding is only for 1 byte characters"); |
| |
| // Now that we've parsed/checked the UCN, we convert from UTF32->UTF8. |
| // The conversion below was inspired by: |
| // http://www.unicode.org/Public/PROGRAMS/CVTUTF/ConvertUTF.c |
| // First, we determine how many bytes the result will require. |
| typedef uint8_t UTF8; |
| |
| unsigned short bytesToWrite = 0; |
| if (UcnVal < (UTF32)0x80) |
| bytesToWrite = 1; |
| else if (UcnVal < (UTF32)0x800) |
| bytesToWrite = 2; |
| else if (UcnVal < (UTF32)0x10000) |
| bytesToWrite = 3; |
| else |
| bytesToWrite = 4; |
| |
| const unsigned byteMask = 0xBF; |
| const unsigned byteMark = 0x80; |
| |
| // Once the bits are split out into bytes of UTF8, this is a mask OR-ed |
| // into the first byte, depending on how many bytes follow. |
| static const UTF8 firstByteMark[5] = { |
| 0x00, 0x00, 0xC0, 0xE0, 0xF0 |
| }; |
| // Finally, we write the bytes into ResultBuf. |
| ResultBuf += bytesToWrite; |
| switch (bytesToWrite) { // note: everything falls through. |
| case 4: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; |
| case 3: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; |
| case 2: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; |
| case 1: *--ResultBuf = (UTF8) (UcnVal | firstByteMark[bytesToWrite]); |
| } |
| // Update the buffer. |
| ResultBuf += bytesToWrite; |
| } |
| |
| |
| /// integer-constant: [C99 6.4.4.1] |
| /// decimal-constant integer-suffix |
| /// octal-constant integer-suffix |
| /// hexadecimal-constant integer-suffix |
| /// user-defined-integer-literal: [C++11 lex.ext] |
| /// decimal-literal ud-suffix |
| /// octal-literal ud-suffix |
| /// hexadecimal-literal ud-suffix |
| /// decimal-constant: |
| /// nonzero-digit |
| /// decimal-constant digit |
| /// octal-constant: |
| /// 0 |
| /// octal-constant octal-digit |
| /// hexadecimal-constant: |
| /// hexadecimal-prefix hexadecimal-digit |
| /// hexadecimal-constant hexadecimal-digit |
| /// hexadecimal-prefix: one of |
| /// 0x 0X |
| /// integer-suffix: |
| /// unsigned-suffix [long-suffix] |
| /// unsigned-suffix [long-long-suffix] |
| /// long-suffix [unsigned-suffix] |
| /// long-long-suffix [unsigned-sufix] |
| /// nonzero-digit: |
| /// 1 2 3 4 5 6 7 8 9 |
| /// octal-digit: |
| /// 0 1 2 3 4 5 6 7 |
| /// hexadecimal-digit: |
| /// 0 1 2 3 4 5 6 7 8 9 |
| /// a b c d e f |
| /// A B C D E F |
| /// unsigned-suffix: one of |
| /// u U |
| /// long-suffix: one of |
| /// l L |
| /// long-long-suffix: one of |
| /// ll LL |
| /// |
| /// floating-constant: [C99 6.4.4.2] |
| /// TODO: add rules... |
| /// |
| NumericLiteralParser::NumericLiteralParser(StringRef TokSpelling, |
| SourceLocation TokLoc, |
| Preprocessor &PP) |
| : PP(PP), ThisTokBegin(TokSpelling.begin()), ThisTokEnd(TokSpelling.end()) { |
| |
| // This routine assumes that the range begin/end matches the regex for integer |
| // and FP constants (specifically, the 'pp-number' regex), and assumes that |
| // the byte at "*end" is both valid and not part of the regex. Because of |
| // this, it doesn't have to check for 'overscan' in various places. |
| assert(!isalnum(*ThisTokEnd) && *ThisTokEnd != '.' && *ThisTokEnd != '_' && |
| "Lexer didn't maximally munch?"); |
| |
| s = DigitsBegin = ThisTokBegin; |
| saw_exponent = false; |
| saw_period = false; |
| saw_ud_suffix = false; |
| isLong = false; |
| isUnsigned = false; |
| isLongLong = false; |
| isFloat = false; |
| isImaginary = false; |
| isMicrosoftInteger = false; |
| hadError = false; |
| |
| if (*s == '0') { // parse radix |
| ParseNumberStartingWithZero(TokLoc); |
| if (hadError) |
| return; |
| } else { // the first digit is non-zero |
| radix = 10; |
| s = SkipDigits(s); |
| if (s == ThisTokEnd) { |
| // Done. |
| } else if (isxdigit(*s) && !(*s == 'e' || *s == 'E')) { |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s - ThisTokBegin), |
| diag::err_invalid_decimal_digit) << StringRef(s, 1); |
| hadError = true; |
| return; |
| } else if (*s == '.') { |
| s++; |
| saw_period = true; |
| s = SkipDigits(s); |
| } |
| if ((*s == 'e' || *s == 'E')) { // exponent |
| const char *Exponent = s; |
| s++; |
| saw_exponent = true; |
| if (*s == '+' || *s == '-') s++; // sign |
| const char *first_non_digit = SkipDigits(s); |
| if (first_non_digit != s) { |
| s = first_non_digit; |
| } else { |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent - ThisTokBegin), |
| diag::err_exponent_has_no_digits); |
| hadError = true; |
| return; |
| } |
| } |
| } |
| |
| SuffixBegin = s; |
| |
| // Parse the suffix. At this point we can classify whether we have an FP or |
| // integer constant. |
| bool isFPConstant = isFloatingLiteral(); |
| |
| // Loop over all of the characters of the suffix. If we see something bad, |
| // we break out of the loop. |
| for (; s != ThisTokEnd; ++s) { |
| switch (*s) { |
| case 'f': // FP Suffix for "float" |
| case 'F': |
| if (!isFPConstant) break; // Error for integer constant. |
| if (isFloat || isLong) break; // FF, LF invalid. |
| isFloat = true; |
| continue; // Success. |
| case 'u': |
| case 'U': |
| if (isFPConstant) break; // Error for floating constant. |
| if (isUnsigned) break; // Cannot be repeated. |
| isUnsigned = true; |
| continue; // Success. |
| case 'l': |
| case 'L': |
| if (isLong || isLongLong) break; // Cannot be repeated. |
| if (isFloat) break; // LF invalid. |
| |
| // Check for long long. The L's need to be adjacent and the same case. |
| if (s+1 != ThisTokEnd && s[1] == s[0]) { |
| if (isFPConstant) break; // long long invalid for floats. |
| isLongLong = true; |
| ++s; // Eat both of them. |
| } else { |
| isLong = true; |
| } |
| continue; // Success. |
| case 'i': |
| case 'I': |
| if (PP.getLangOpts().MicrosoftExt) { |
| if (isFPConstant || isLong || isLongLong) break; |
| |
| // Allow i8, i16, i32, i64, and i128. |
| if (s + 1 != ThisTokEnd) { |
| switch (s[1]) { |
| case '8': |
| s += 2; // i8 suffix |
| isMicrosoftInteger = true; |
| break; |
| case '1': |
| if (s + 2 == ThisTokEnd) break; |
| if (s[2] == '6') { |
| s += 3; // i16 suffix |
| isMicrosoftInteger = true; |
| } |
| else if (s[2] == '2') { |
| if (s + 3 == ThisTokEnd) break; |
| if (s[3] == '8') { |
| s += 4; // i128 suffix |
| isMicrosoftInteger = true; |
| } |
| } |
| break; |
| case '3': |
| if (s + 2 == ThisTokEnd) break; |
| if (s[2] == '2') { |
| s += 3; // i32 suffix |
| isLong = true; |
| isMicrosoftInteger = true; |
| } |
| break; |
| case '6': |
| if (s + 2 == ThisTokEnd) break; |
| if (s[2] == '4') { |
| s += 3; // i64 suffix |
| isLongLong = true; |
| isMicrosoftInteger = true; |
| } |
| break; |
| default: |
| break; |
| } |
| break; |
| } |
| } |
| // fall through. |
| case 'j': |
| case 'J': |
| if (isImaginary) break; // Cannot be repeated. |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s - ThisTokBegin), |
| diag::ext_imaginary_constant); |
| isImaginary = true; |
| continue; // Success. |
| } |
| // If we reached here, there was an error or a ud-suffix. |
| break; |
| } |
| |
| if (s != ThisTokEnd) { |
| if (PP.getLangOpts().CPlusPlus0x && s == SuffixBegin && *s == '_') { |
| // We have a ud-suffix! By C++11 [lex.ext]p10, ud-suffixes not starting |
| // with an '_' are ill-formed. |
| saw_ud_suffix = true; |
| return; |
| } |
| |
| // Report an error if there are any. |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, SuffixBegin - ThisTokBegin), |
| isFPConstant ? diag::err_invalid_suffix_float_constant : |
| diag::err_invalid_suffix_integer_constant) |
| << StringRef(SuffixBegin, ThisTokEnd-SuffixBegin); |
| hadError = true; |
| return; |
| } |
| } |
| |
| /// ParseNumberStartingWithZero - This method is called when the first character |
| /// of the number is found to be a zero. This means it is either an octal |
| /// number (like '04') or a hex number ('0x123a') a binary number ('0b1010') or |
| /// a floating point number (01239.123e4). Eat the prefix, determining the |
| /// radix etc. |
| void NumericLiteralParser::ParseNumberStartingWithZero(SourceLocation TokLoc) { |
| assert(s[0] == '0' && "Invalid method call"); |
| s++; |
| |
| // Handle a hex number like 0x1234. |
| if ((*s == 'x' || *s == 'X') && (isxdigit(s[1]) || s[1] == '.')) { |
| s++; |
| radix = 16; |
| DigitsBegin = s; |
| s = SkipHexDigits(s); |
| bool noSignificand = (s == DigitsBegin); |
| if (s == ThisTokEnd) { |
| // Done. |
| } else if (*s == '.') { |
| s++; |
| saw_period = true; |
| const char *floatDigitsBegin = s; |
| s = SkipHexDigits(s); |
| noSignificand &= (floatDigitsBegin == s); |
| } |
| |
| if (noSignificand) { |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s - ThisTokBegin), |
| diag::err_hexconstant_requires_digits); |
| hadError = true; |
| return; |
| } |
| |
| // A binary exponent can appear with or with a '.'. If dotted, the |
| // binary exponent is required. |
| if (*s == 'p' || *s == 'P') { |
| const char *Exponent = s; |
| s++; |
| saw_exponent = true; |
| if (*s == '+' || *s == '-') s++; // sign |
| const char *first_non_digit = SkipDigits(s); |
| if (first_non_digit == s) { |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-ThisTokBegin), |
| diag::err_exponent_has_no_digits); |
| hadError = true; |
| return; |
| } |
| s = first_non_digit; |
| |
| if (!PP.getLangOpts().HexFloats) |
| PP.Diag(TokLoc, diag::ext_hexconstant_invalid); |
| } else if (saw_period) { |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), |
| diag::err_hexconstant_requires_exponent); |
| hadError = true; |
| } |
| return; |
| } |
| |
| // Handle simple binary numbers 0b01010 |
| if (*s == 'b' || *s == 'B') { |
| // 0b101010 is a GCC extension. |
| PP.Diag(TokLoc, diag::ext_binary_literal); |
| ++s; |
| radix = 2; |
| DigitsBegin = s; |
| s = SkipBinaryDigits(s); |
| if (s == ThisTokEnd) { |
| // Done. |
| } else if (isxdigit(*s)) { |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), |
| diag::err_invalid_binary_digit) << StringRef(s, 1); |
| hadError = true; |
| } |
| // Other suffixes will be diagnosed by the caller. |
| return; |
| } |
| |
| // For now, the radix is set to 8. If we discover that we have a |
| // floating point constant, the radix will change to 10. Octal floating |
| // point constants are not permitted (only decimal and hexadecimal). |
| radix = 8; |
| DigitsBegin = s; |
| s = SkipOctalDigits(s); |
| if (s == ThisTokEnd) |
| return; // Done, simple octal number like 01234 |
| |
| // If we have some other non-octal digit that *is* a decimal digit, see if |
| // this is part of a floating point number like 094.123 or 09e1. |
| if (isdigit(*s)) { |
| const char *EndDecimal = SkipDigits(s); |
| if (EndDecimal[0] == '.' || EndDecimal[0] == 'e' || EndDecimal[0] == 'E') { |
| s = EndDecimal; |
| radix = 10; |
| } |
| } |
| |
| // If we have a hex digit other than 'e' (which denotes a FP exponent) then |
| // the code is using an incorrect base. |
| if (isxdigit(*s) && *s != 'e' && *s != 'E') { |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), |
| diag::err_invalid_octal_digit) << StringRef(s, 1); |
| hadError = true; |
| return; |
| } |
| |
| if (*s == '.') { |
| s++; |
| radix = 10; |
| saw_period = true; |
| s = SkipDigits(s); // Skip suffix. |
| } |
| if (*s == 'e' || *s == 'E') { // exponent |
| const char *Exponent = s; |
| s++; |
| radix = 10; |
| saw_exponent = true; |
| if (*s == '+' || *s == '-') s++; // sign |
| const char *first_non_digit = SkipDigits(s); |
| if (first_non_digit != s) { |
| s = first_non_digit; |
| } else { |
| PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-ThisTokBegin), |
| diag::err_exponent_has_no_digits); |
| hadError = true; |
| return; |
| } |
| } |
| } |
| |
| static bool alwaysFitsInto64Bits(unsigned Radix, unsigned NumDigits) { |
| switch (Radix) { |
| case 2: |
| return NumDigits <= 64; |
| case 8: |
| return NumDigits <= 64 / 3; // Digits are groups of 3 bits. |
| case 10: |
| return NumDigits <= 19; // floor(log10(2^64)) |
| case 16: |
| return NumDigits <= 64 / 4; // Digits are groups of 4 bits. |
| default: |
| llvm_unreachable("impossible Radix"); |
| } |
| } |
| |
| /// GetIntegerValue - Convert this numeric literal value to an APInt that |
| /// matches Val's input width. If there is an overflow, set Val to the low bits |
| /// of the result and return true. Otherwise, return false. |
| bool NumericLiteralParser::GetIntegerValue(llvm::APInt &Val) { |
| // Fast path: Compute a conservative bound on the maximum number of |
| // bits per digit in this radix. If we can't possibly overflow a |
| // uint64 based on that bound then do the simple conversion to |
| // integer. This avoids the expensive overflow checking below, and |
| // handles the common cases that matter (small decimal integers and |
| // hex/octal values which don't overflow). |
| const unsigned NumDigits = SuffixBegin - DigitsBegin; |
| if (alwaysFitsInto64Bits(radix, NumDigits)) { |
| uint64_t N = 0; |
| for (const char *Ptr = DigitsBegin; Ptr != SuffixBegin; ++Ptr) |
| N = N * radix + HexDigitValue(*Ptr); |
| |
| // This will truncate the value to Val's input width. Simply check |
| // for overflow by comparing. |
| Val = N; |
| return Val.getZExtValue() != N; |
| } |
| |
| Val = 0; |
| const char *Ptr = DigitsBegin; |
| |
| llvm::APInt RadixVal(Val.getBitWidth(), radix); |
| llvm::APInt CharVal(Val.getBitWidth(), 0); |
| llvm::APInt OldVal = Val; |
| |
| bool OverflowOccurred = false; |
| while (Ptr < SuffixBegin) { |
| unsigned C = HexDigitValue(*Ptr++); |
| |
| // If this letter is out of bound for this radix, reject it. |
| assert(C < radix && "NumericLiteralParser ctor should have rejected this"); |
| |
| CharVal = C; |
| |
| // Add the digit to the value in the appropriate radix. If adding in digits |
| // made the value smaller, then this overflowed. |
| OldVal = Val; |
| |
| // Multiply by radix, did overflow occur on the multiply? |
| Val *= RadixVal; |
| OverflowOccurred |= Val.udiv(RadixVal) != OldVal; |
| |
| // Add value, did overflow occur on the value? |
| // (a + b) ult b <=> overflow |
| Val += CharVal; |
| OverflowOccurred |= Val.ult(CharVal); |
| } |
| return OverflowOccurred; |
| } |
| |
| llvm::APFloat::opStatus |
| NumericLiteralParser::GetFloatValue(llvm::APFloat &Result) { |
| using llvm::APFloat; |
| |
| unsigned n = std::min(SuffixBegin - ThisTokBegin, ThisTokEnd - ThisTokBegin); |
| return Result.convertFromString(StringRef(ThisTokBegin, n), |
| APFloat::rmNearestTiesToEven); |
| } |
| |
| |
| /// \verbatim |
| /// user-defined-character-literal: [C++11 lex.ext] |
| /// character-literal ud-suffix |
| /// ud-suffix: |
| /// identifier |
| /// character-literal: [C++11 lex.ccon] |
| /// ' c-char-sequence ' |
| /// u' c-char-sequence ' |
| /// U' c-char-sequence ' |
| /// L' c-char-sequence ' |
| /// c-char-sequence: |
| /// c-char |
| /// c-char-sequence c-char |
| /// c-char: |
| /// any member of the source character set except the single-quote ', |
| /// backslash \, or new-line character |
| /// escape-sequence |
| /// universal-character-name |
| /// escape-sequence: |
| /// simple-escape-sequence |
| /// octal-escape-sequence |
| /// hexadecimal-escape-sequence |
| /// simple-escape-sequence: |
| /// one of \' \" \? \\ \a \b \f \n \r \t \v |
| /// octal-escape-sequence: |
| /// \ octal-digit |
| /// \ octal-digit octal-digit |
| /// \ octal-digit octal-digit octal-digit |
| /// hexadecimal-escape-sequence: |
| /// \x hexadecimal-digit |
| /// hexadecimal-escape-sequence hexadecimal-digit |
| /// universal-character-name: [C++11 lex.charset] |
| /// \u hex-quad |
| /// \U hex-quad hex-quad |
| /// hex-quad: |
| /// hex-digit hex-digit hex-digit hex-digit |
| /// \endverbatim |
| /// |
| CharLiteralParser::CharLiteralParser(const char *begin, const char *end, |
| SourceLocation Loc, Preprocessor &PP, |
| tok::TokenKind kind) { |
| // At this point we know that the character matches the regex "(L|u|U)?'.*'". |
| HadError = false; |
| |
| Kind = kind; |
| |
| const char *TokBegin = begin; |
| |
| // Skip over wide character determinant. |
| if (Kind != tok::char_constant) { |
| ++begin; |
| } |
| |
| // Skip over the entry quote. |
| assert(begin[0] == '\'' && "Invalid token lexed"); |
| ++begin; |
| |
| // Remove an optional ud-suffix. |
| if (end[-1] != '\'') { |
| const char *UDSuffixEnd = end; |
| do { |
| --end; |
| } while (end[-1] != '\''); |
| UDSuffixBuf.assign(end, UDSuffixEnd); |
| UDSuffixOffset = end - TokBegin; |
| } |
| |
| // Trim the ending quote. |
| assert(end != begin && "Invalid token lexed"); |
| --end; |
| |
| // FIXME: The "Value" is an uint64_t so we can handle char literals of |
| // up to 64-bits. |
| // FIXME: This extensively assumes that 'char' is 8-bits. |
| assert(PP.getTargetInfo().getCharWidth() == 8 && |
| "Assumes char is 8 bits"); |
| assert(PP.getTargetInfo().getIntWidth() <= 64 && |
| (PP.getTargetInfo().getIntWidth() & 7) == 0 && |
| "Assumes sizeof(int) on target is <= 64 and a multiple of char"); |
| assert(PP.getTargetInfo().getWCharWidth() <= 64 && |
| "Assumes sizeof(wchar) on target is <= 64"); |
| |
| SmallVector<uint32_t,4> codepoint_buffer; |
| codepoint_buffer.resize(end-begin); |
| uint32_t *buffer_begin = &codepoint_buffer.front(); |
| uint32_t *buffer_end = buffer_begin + codepoint_buffer.size(); |
| |
| // Unicode escapes representing characters that cannot be correctly |
| // represented in a single code unit are disallowed in character literals |
| // by this implementation. |
| uint32_t largest_character_for_kind; |
| if (tok::wide_char_constant == Kind) { |
| largest_character_for_kind = 0xFFFFFFFFu >> (32-PP.getTargetInfo().getWCharWidth()); |
| } else if (tok::utf16_char_constant == Kind) { |
| largest_character_for_kind = 0xFFFF; |
| } else if (tok::utf32_char_constant == Kind) { |
| largest_character_for_kind = 0x10FFFF; |
| } else { |
| largest_character_for_kind = 0x7Fu; |
| } |
| |
| while (begin!=end) { |
| // Is this a span of non-escape characters? |
| if (begin[0] != '\\') { |
| char const *start = begin; |
| do { |
| ++begin; |
| } while (begin != end && *begin != '\\'); |
| |
| char const *tmp_in_start = start; |
| uint32_t *tmp_out_start = buffer_begin; |
| ConversionResult res = |
| ConvertUTF8toUTF32(reinterpret_cast<UTF8 const **>(&start), |
| reinterpret_cast<UTF8 const *>(begin), |
| &buffer_begin,buffer_end,strictConversion); |
| if (res!=conversionOK) { |
| // If we see bad encoding for unprefixed character literals, warn and |
| // simply copy the byte values, for compatibility with gcc and |
| // older versions of clang. |
| bool NoErrorOnBadEncoding = isAscii(); |
| unsigned Msg = diag::err_bad_character_encoding; |
| if (NoErrorOnBadEncoding) |
| Msg = diag::warn_bad_character_encoding; |
| PP.Diag(Loc, Msg); |
| if (NoErrorOnBadEncoding) { |
| start = tmp_in_start; |
| buffer_begin = tmp_out_start; |
| for ( ; start != begin; ++start, ++buffer_begin) |
| *buffer_begin = static_cast<uint8_t>(*start); |
| } else { |
| HadError = true; |
| } |
| } else { |
| for (; tmp_out_start <buffer_begin; ++tmp_out_start) { |
| if (*tmp_out_start > largest_character_for_kind) { |
| HadError = true; |
| PP.Diag(Loc, diag::err_character_too_large); |
| } |
| } |
| } |
| |
| continue; |
| } |
| // Is this a Universal Character Name excape? |
| if (begin[1] == 'u' || begin[1] == 'U') { |
| unsigned short UcnLen = 0; |
| if (!ProcessUCNEscape(TokBegin, begin, end, *buffer_begin, UcnLen, |
| FullSourceLoc(Loc, PP.getSourceManager()), |
| &PP.getDiagnostics(), PP.getLangOpts(), |
| true)) |
| { |
| HadError = true; |
| } else if (*buffer_begin > largest_character_for_kind) { |
| HadError = true; |
| PP.Diag(Loc, diag::err_character_too_large); |
| } |
| |
| ++buffer_begin; |
| continue; |
| } |
| unsigned CharWidth = getCharWidth(Kind, PP.getTargetInfo()); |
| uint64_t result = |
| ProcessCharEscape(TokBegin, begin, end, HadError, |
| FullSourceLoc(Loc,PP.getSourceManager()), |
| CharWidth, &PP.getDiagnostics(), PP.getLangOpts()); |
| *buffer_begin++ = result; |
| } |
| |
| unsigned NumCharsSoFar = buffer_begin-&codepoint_buffer.front(); |
| |
| if (NumCharsSoFar > 1) { |
| if (isWide()) |
| PP.Diag(Loc, diag::warn_extraneous_char_constant); |
| else if (isAscii() && NumCharsSoFar == 4) |
| PP.Diag(Loc, diag::ext_four_char_character_literal); |
| else if (isAscii()) |
| PP.Diag(Loc, diag::ext_multichar_character_literal); |
| else |
| PP.Diag(Loc, diag::err_multichar_utf_character_literal); |
| IsMultiChar = true; |
| } else |
| IsMultiChar = false; |
| |
| llvm::APInt LitVal(PP.getTargetInfo().getIntWidth(), 0); |
| |
| // Narrow character literals act as though their value is concatenated |
| // in this implementation, but warn on overflow. |
| bool multi_char_too_long = false; |
| if (isAscii() && isMultiChar()) { |
| LitVal = 0; |
| for (size_t i=0;i<NumCharsSoFar;++i) { |
| // check for enough leading zeros to shift into |
| multi_char_too_long |= (LitVal.countLeadingZeros() < 8); |
| LitVal <<= 8; |
| LitVal = LitVal + (codepoint_buffer[i] & 0xFF); |
| } |
| } else if (NumCharsSoFar > 0) { |
| // otherwise just take the last character |
| LitVal = buffer_begin[-1]; |
| } |
| |
| if (!HadError && multi_char_too_long) { |
| PP.Diag(Loc,diag::warn_char_constant_too_large); |
| } |
| |
| // Transfer the value from APInt to uint64_t |
| Value = LitVal.getZExtValue(); |
| |
| // If this is a single narrow character, sign extend it (e.g. '\xFF' is "-1") |
| // if 'char' is signed for this target (C99 6.4.4.4p10). Note that multiple |
| // character constants are not sign extended in the this implementation: |
| // '\xFF\xFF' = 65536 and '\x0\xFF' = 255, which matches GCC. |
| if (isAscii() && NumCharsSoFar == 1 && (Value & 128) && |
| PP.getLangOpts().CharIsSigned) |
| Value = (signed char)Value; |
| } |
| |
| /// \verbatim |
| /// string-literal: [C++0x lex.string] |
| /// encoding-prefix " [s-char-sequence] " |
| /// encoding-prefix R raw-string |
| /// encoding-prefix: |
| /// u8 |
| /// u |
| /// U |
| /// L |
| /// s-char-sequence: |
| /// s-char |
| /// s-char-sequence s-char |
| /// s-char: |
| /// any member of the source character set except the double-quote ", |
| /// backslash \, or new-line character |
| /// escape-sequence |
| /// universal-character-name |
| /// raw-string: |
| /// " d-char-sequence ( r-char-sequence ) d-char-sequence " |
| /// r-char-sequence: |
| /// r-char |
| /// r-char-sequence r-char |
| /// r-char: |
| /// any member of the source character set, except a right parenthesis ) |
| /// followed by the initial d-char-sequence (which may be empty) |
| /// followed by a double quote ". |
| /// d-char-sequence: |
| /// d-char |
| /// d-char-sequence d-char |
| /// d-char: |
| /// any member of the basic source character set except: |
| /// space, the left parenthesis (, the right parenthesis ), |
| /// the backslash \, and the control characters representing horizontal |
| /// tab, vertical tab, form feed, and newline. |
| /// escape-sequence: [C++0x lex.ccon] |
| /// simple-escape-sequence |
| /// octal-escape-sequence |
| /// hexadecimal-escape-sequence |
| /// simple-escape-sequence: |
| /// one of \' \" \? \\ \a \b \f \n \r \t \v |
| /// octal-escape-sequence: |
| /// \ octal-digit |
| /// \ octal-digit octal-digit |
| /// \ octal-digit octal-digit octal-digit |
| /// hexadecimal-escape-sequence: |
| /// \x hexadecimal-digit |
| /// hexadecimal-escape-sequence hexadecimal-digit |
| /// universal-character-name: |
| /// \u hex-quad |
| /// \U hex-quad hex-quad |
| /// hex-quad: |
| /// hex-digit hex-digit hex-digit hex-digit |
| /// \endverbatim |
| /// |
| StringLiteralParser:: |
| StringLiteralParser(const Token *StringToks, unsigned NumStringToks, |
| Preprocessor &PP, bool Complain) |
| : SM(PP.getSourceManager()), Features(PP.getLangOpts()), |
| Target(PP.getTargetInfo()), Diags(Complain ? &PP.getDiagnostics() : 0), |
| MaxTokenLength(0), SizeBound(0), CharByteWidth(0), Kind(tok::unknown), |
| ResultPtr(ResultBuf.data()), hadError(false), Pascal(false) { |
| init(StringToks, NumStringToks); |
| } |
| |
| void StringLiteralParser::init(const Token *StringToks, unsigned NumStringToks){ |
| // The literal token may have come from an invalid source location (e.g. due |
| // to a PCH error), in which case the token length will be 0. |
| if (NumStringToks == 0 || StringToks[0].getLength() < 2) |
| return DiagnoseLexingError(SourceLocation()); |
| |
| // Scan all of the string portions, remember the max individual token length, |
| // computing a bound on the concatenated string length, and see whether any |
| // piece is a wide-string. If any of the string portions is a wide-string |
| // literal, the result is a wide-string literal [C99 6.4.5p4]. |
| assert(NumStringToks && "expected at least one token"); |
| MaxTokenLength = StringToks[0].getLength(); |
| assert(StringToks[0].getLength() >= 2 && "literal token is invalid!"); |
| SizeBound = StringToks[0].getLength()-2; // -2 for "". |
| Kind = StringToks[0].getKind(); |
| |
| hadError = false; |
| |
| // Implement Translation Phase #6: concatenation of string literals |
| /// (C99 5.1.1.2p1). The common case is only one string fragment. |
| for (unsigned i = 1; i != NumStringToks; ++i) { |
| if (StringToks[i].getLength() < 2) |
| return DiagnoseLexingError(StringToks[i].getLocation()); |
| |
| // The string could be shorter than this if it needs cleaning, but this is a |
| // reasonable bound, which is all we need. |
| assert(StringToks[i].getLength() >= 2 && "literal token is invalid!"); |
| SizeBound += StringToks[i].getLength()-2; // -2 for "". |
| |
| // Remember maximum string piece length. |
| if (StringToks[i].getLength() > MaxTokenLength) |
| MaxTokenLength = StringToks[i].getLength(); |
| |
| // Remember if we see any wide or utf-8/16/32 strings. |
| // Also check for illegal concatenations. |
| if (StringToks[i].isNot(Kind) && StringToks[i].isNot(tok::string_literal)) { |
| if (isAscii()) { |
| Kind = StringToks[i].getKind(); |
| } else { |
| if (Diags) |
| Diags->Report(StringToks[i].getLocation(), |
| diag::err_unsupported_string_concat); |
| hadError = true; |
| } |
| } |
| } |
| |
| // Include space for the null terminator. |
| ++SizeBound; |
| |
| // TODO: K&R warning: "traditional C rejects string constant concatenation" |
| |
| // Get the width in bytes of char/wchar_t/char16_t/char32_t |
| CharByteWidth = getCharWidth(Kind, Target); |
| assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple"); |
| CharByteWidth /= 8; |
| |
| // The output buffer size needs to be large enough to hold wide characters. |
| // This is a worst-case assumption which basically corresponds to L"" "long". |
| SizeBound *= CharByteWidth; |
| |
| // Size the temporary buffer to hold the result string data. |
| ResultBuf.resize(SizeBound); |
| |
| // Likewise, but for each string piece. |
| SmallString<512> TokenBuf; |
| TokenBuf.resize(MaxTokenLength); |
| |
| // Loop over all the strings, getting their spelling, and expanding them to |
| // wide strings as appropriate. |
| ResultPtr = &ResultBuf[0]; // Next byte to fill in. |
| |
| Pascal = false; |
| |
| SourceLocation UDSuffixTokLoc; |
| |
| for (unsigned i = 0, e = NumStringToks; i != e; ++i) { |
| const char *ThisTokBuf = &TokenBuf[0]; |
| // Get the spelling of the token, which eliminates trigraphs, etc. We know |
| // that ThisTokBuf points to a buffer that is big enough for the whole token |
| // and 'spelled' tokens can only shrink. |
| bool StringInvalid = false; |
| unsigned ThisTokLen = |
| Lexer::getSpelling(StringToks[i], ThisTokBuf, SM, Features, |
| &StringInvalid); |
| if (StringInvalid) |
| return DiagnoseLexingError(StringToks[i].getLocation()); |
| |
| const char *ThisTokBegin = ThisTokBuf; |
| const char *ThisTokEnd = ThisTokBuf+ThisTokLen; |
| |
| // Remove an optional ud-suffix. |
| if (ThisTokEnd[-1] != '"') { |
| const char *UDSuffixEnd = ThisTokEnd; |
| do { |
| --ThisTokEnd; |
| } while (ThisTokEnd[-1] != '"'); |
| |
| StringRef UDSuffix(ThisTokEnd, UDSuffixEnd - ThisTokEnd); |
| |
| if (UDSuffixBuf.empty()) { |
| UDSuffixBuf.assign(UDSuffix); |
| UDSuffixToken = i; |
| UDSuffixOffset = ThisTokEnd - ThisTokBuf; |
| UDSuffixTokLoc = StringToks[i].getLocation(); |
| } else if (!UDSuffixBuf.equals(UDSuffix)) { |
| // C++11 [lex.ext]p8: At the end of phase 6, if a string literal is the |
| // result of a concatenation involving at least one user-defined-string- |
| // literal, all the participating user-defined-string-literals shall |
| // have the same ud-suffix. |
| if (Diags) { |
| SourceLocation TokLoc = StringToks[i].getLocation(); |
| Diags->Report(TokLoc, diag::err_string_concat_mixed_suffix) |
| << UDSuffixBuf << UDSuffix |
| << SourceRange(UDSuffixTokLoc, UDSuffixTokLoc) |
| << SourceRange(TokLoc, TokLoc); |
| } |
| hadError = true; |
| } |
| } |
| |
| // Strip the end quote. |
| --ThisTokEnd; |
| |
| // TODO: Input character set mapping support. |
| |
| // Skip marker for wide or unicode strings. |
| if (ThisTokBuf[0] == 'L' || ThisTokBuf[0] == 'u' || ThisTokBuf[0] == 'U') { |
| ++ThisTokBuf; |
| // Skip 8 of u8 marker for utf8 strings. |
| if (ThisTokBuf[0] == '8') |
| ++ThisTokBuf; |
| } |
| |
| // Check for raw string |
| if (ThisTokBuf[0] == 'R') { |
| ThisTokBuf += 2; // skip R" |
| |
| const char *Prefix = ThisTokBuf; |
| while (ThisTokBuf[0] != '(') |
| ++ThisTokBuf; |
| ++ThisTokBuf; // skip '(' |
| |
| // Remove same number of characters from the end |
| ThisTokEnd -= ThisTokBuf - Prefix; |
| assert(ThisTokEnd >= ThisTokBuf && "malformed raw string literal"); |
| |
| // Copy the string over |
| if (CopyStringFragment(StringToks[i], ThisTokBegin, |
| StringRef(ThisTokBuf, ThisTokEnd - ThisTokBuf))) |
| hadError = true; |
| } else { |
| if (ThisTokBuf[0] != '"') { |
| // The file may have come from PCH and then changed after loading the |
| // PCH; Fail gracefully. |
| return DiagnoseLexingError(StringToks[i].getLocation()); |
| } |
| ++ThisTokBuf; // skip " |
| |
| // Check if this is a pascal string |
| if (Features.PascalStrings && ThisTokBuf + 1 != ThisTokEnd && |
| ThisTokBuf[0] == '\\' && ThisTokBuf[1] == 'p') { |
| |
| // If the \p sequence is found in the first token, we have a pascal string |
| // Otherwise, if we already have a pascal string, ignore the first \p |
| if (i == 0) { |
| ++ThisTokBuf; |
| Pascal = true; |
| } else if (Pascal) |
| ThisTokBuf += 2; |
| } |
| |
| while (ThisTokBuf != ThisTokEnd) { |
| // Is this a span of non-escape characters? |
| if (ThisTokBuf[0] != '\\') { |
| const char *InStart = ThisTokBuf; |
| do { |
| ++ThisTokBuf; |
| } while (ThisTokBuf != ThisTokEnd && ThisTokBuf[0] != '\\'); |
| |
| // Copy the character span over. |
| if (CopyStringFragment(StringToks[i], ThisTokBegin, |
| StringRef(InStart, ThisTokBuf - InStart))) |
| hadError = true; |
| continue; |
| } |
| // Is this a Universal Character Name escape? |
| if (ThisTokBuf[1] == 'u' || ThisTokBuf[1] == 'U') { |
| EncodeUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, |
| ResultPtr, hadError, |
| FullSourceLoc(StringToks[i].getLocation(), SM), |
| CharByteWidth, Diags, Features); |
| continue; |
| } |
| // Otherwise, this is a non-UCN escape character. Process it. |
| unsigned ResultChar = |
| ProcessCharEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, hadError, |
| FullSourceLoc(StringToks[i].getLocation(), SM), |
| CharByteWidth*8, Diags, Features); |
| |
| if (CharByteWidth == 4) { |
| // FIXME: Make the type of the result buffer correct instead of |
| // using reinterpret_cast. |
| UTF32 *ResultWidePtr = reinterpret_cast<UTF32*>(ResultPtr); |
| *ResultWidePtr = ResultChar; |
| ResultPtr += 4; |
| } else if (CharByteWidth == 2) { |
| // FIXME: Make the type of the result buffer correct instead of |
| // using reinterpret_cast. |
| UTF16 *ResultWidePtr = reinterpret_cast<UTF16*>(ResultPtr); |
| *ResultWidePtr = ResultChar & 0xFFFF; |
| ResultPtr += 2; |
| } else { |
| assert(CharByteWidth == 1 && "Unexpected char width"); |
| *ResultPtr++ = ResultChar & 0xFF; |
| } |
| } |
| } |
| } |
| |
| if (Pascal) { |
| if (CharByteWidth == 4) { |
| // FIXME: Make the type of the result buffer correct instead of |
| // using reinterpret_cast. |
| UTF32 *ResultWidePtr = reinterpret_cast<UTF32*>(ResultBuf.data()); |
| ResultWidePtr[0] = GetNumStringChars() - 1; |
| } else if (CharByteWidth == 2) { |
| // FIXME: Make the type of the result buffer correct instead of |
| // using reinterpret_cast. |
| UTF16 *ResultWidePtr = reinterpret_cast<UTF16*>(ResultBuf.data()); |
| ResultWidePtr[0] = GetNumStringChars() - 1; |
| } else { |
| assert(CharByteWidth == 1 && "Unexpected char width"); |
| ResultBuf[0] = GetNumStringChars() - 1; |
| } |
| |
| // Verify that pascal strings aren't too large. |
| if (GetStringLength() > 256) { |
| if (Diags) |
| Diags->Report(StringToks[0].getLocation(), |
| diag::err_pascal_string_too_long) |
| << SourceRange(StringToks[0].getLocation(), |
| StringToks[NumStringToks-1].getLocation()); |
| hadError = true; |
| return; |
| } |
| } else if (Diags) { |
| // Complain if this string literal has too many characters. |
| unsigned MaxChars = Features.CPlusPlus? 65536 : Features.C99 ? 4095 : 509; |
| |
| if (GetNumStringChars() > MaxChars) |
| Diags->Report(StringToks[0].getLocation(), |
| diag::ext_string_too_long) |
| << GetNumStringChars() << MaxChars |
| << (Features.CPlusPlus ? 2 : Features.C99 ? 1 : 0) |
| << SourceRange(StringToks[0].getLocation(), |
| StringToks[NumStringToks-1].getLocation()); |
| } |
| } |
| |
| static const char *resyncUTF8(const char *Err, const char *End) { |
| if (Err == End) |
| return End; |
| End = Err + std::min<unsigned>(getNumBytesForUTF8(*Err), End-Err); |
| while (++Err != End && (*Err & 0xC0) == 0x80) |
| ; |
| return Err; |
| } |
| |
| /// \brief This function copies from Fragment, which is a sequence of bytes |
| /// within Tok's contents (which begin at TokBegin) into ResultPtr. |
| /// Performs widening for multi-byte characters. |
| bool StringLiteralParser::CopyStringFragment(const Token &Tok, |
| const char *TokBegin, |
| StringRef Fragment) { |
| const UTF8 *ErrorPtrTmp; |
| if (ConvertUTF8toWide(CharByteWidth, Fragment, ResultPtr, ErrorPtrTmp)) |
| return false; |
| |
| // If we see bad encoding for unprefixed string literals, warn and |
| // simply copy the byte values, for compatibility with gcc and older |
| // versions of clang. |
| bool NoErrorOnBadEncoding = isAscii(); |
| if (NoErrorOnBadEncoding) { |
| memcpy(ResultPtr, Fragment.data(), Fragment.size()); |
| ResultPtr += Fragment.size(); |
| } |
| |
| if (Diags) { |
| const char *ErrorPtr = reinterpret_cast<const char *>(ErrorPtrTmp); |
| |
| FullSourceLoc SourceLoc(Tok.getLocation(), SM); |
| const DiagnosticBuilder &Builder = |
| Diag(Diags, Features, SourceLoc, TokBegin, |
| ErrorPtr, resyncUTF8(ErrorPtr, Fragment.end()), |
| NoErrorOnBadEncoding ? diag::warn_bad_string_encoding |
| : diag::err_bad_string_encoding); |
| |
| const char *NextStart = resyncUTF8(ErrorPtr, Fragment.end()); |
| StringRef NextFragment(NextStart, Fragment.end()-NextStart); |
| |
| // Decode into a dummy buffer. |
| SmallString<512> Dummy; |
| Dummy.reserve(Fragment.size() * CharByteWidth); |
| char *Ptr = Dummy.data(); |
| |
| while (!Builder.hasMaxRanges() && |
| !ConvertUTF8toWide(CharByteWidth, NextFragment, Ptr, ErrorPtrTmp)) { |
| const char *ErrorPtr = reinterpret_cast<const char *>(ErrorPtrTmp); |
| NextStart = resyncUTF8(ErrorPtr, Fragment.end()); |
| Builder << MakeCharSourceRange(Features, SourceLoc, TokBegin, |
| ErrorPtr, NextStart); |
| NextFragment = StringRef(NextStart, Fragment.end()-NextStart); |
| } |
| } |
| return !NoErrorOnBadEncoding; |
| } |
| |
| void StringLiteralParser::DiagnoseLexingError(SourceLocation Loc) { |
| hadError = true; |
| if (Diags) |
| Diags->Report(Loc, diag::err_lexing_string); |
| } |
| |
| /// getOffsetOfStringByte - This function returns the offset of the |
| /// specified byte of the string data represented by Token. This handles |
| /// advancing over escape sequences in the string. |
| unsigned StringLiteralParser::getOffsetOfStringByte(const Token &Tok, |
| unsigned ByteNo) const { |
| // Get the spelling of the token. |
| SmallString<32> SpellingBuffer; |
| SpellingBuffer.resize(Tok.getLength()); |
| |
| bool StringInvalid = false; |
| const char *SpellingPtr = &SpellingBuffer[0]; |
| unsigned TokLen = Lexer::getSpelling(Tok, SpellingPtr, SM, Features, |
| &StringInvalid); |
| if (StringInvalid) |
| return 0; |
| |
| const char *SpellingStart = SpellingPtr; |
| const char *SpellingEnd = SpellingPtr+TokLen; |
| |
| // Handle UTF-8 strings just like narrow strings. |
| if (SpellingPtr[0] == 'u' && SpellingPtr[1] == '8') |
| SpellingPtr += 2; |
| |
| assert(SpellingPtr[0] != 'L' && SpellingPtr[0] != 'u' && |
| SpellingPtr[0] != 'U' && "Doesn't handle wide or utf strings yet"); |
| |
| // For raw string literals, this is easy. |
| if (SpellingPtr[0] == 'R') { |
| assert(SpellingPtr[1] == '"' && "Should be a raw string literal!"); |
| // Skip 'R"'. |
| SpellingPtr += 2; |
| while (*SpellingPtr != '(') { |
| ++SpellingPtr; |
| assert(SpellingPtr < SpellingEnd && "Missing ( for raw string literal"); |
| } |
| // Skip '('. |
| ++SpellingPtr; |
| return SpellingPtr - SpellingStart + ByteNo; |
| } |
| |
| // Skip over the leading quote |
| assert(SpellingPtr[0] == '"' && "Should be a string literal!"); |
| ++SpellingPtr; |
| |
| // Skip over bytes until we find the offset we're looking for. |
| while (ByteNo) { |
| assert(SpellingPtr < SpellingEnd && "Didn't find byte offset!"); |
| |
| // Step over non-escapes simply. |
| if (*SpellingPtr != '\\') { |
| ++SpellingPtr; |
| --ByteNo; |
| continue; |
| } |
| |
| // Otherwise, this is an escape character. Advance over it. |
| bool HadError = false; |
| if (SpellingPtr[1] == 'u' || SpellingPtr[1] == 'U') { |
| const char *EscapePtr = SpellingPtr; |
| unsigned Len = MeasureUCNEscape(SpellingStart, SpellingPtr, SpellingEnd, |
| 1, Features, HadError); |
| if (Len > ByteNo) { |
| // ByteNo is somewhere within the escape sequence. |
| SpellingPtr = EscapePtr; |
| break; |
| } |
| ByteNo -= Len; |
| } else { |
| ProcessCharEscape(SpellingStart, SpellingPtr, SpellingEnd, HadError, |
| FullSourceLoc(Tok.getLocation(), SM), |
| CharByteWidth*8, Diags, Features); |
| --ByteNo; |
| } |
| assert(!HadError && "This method isn't valid on erroneous strings"); |
| } |
| |
| return SpellingPtr-SpellingStart; |
| } |