15f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===--- LiteralSupport.cpp - Code to parse and process literals ----------===// 25f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 35f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// The LLVM Compiler Infrastructure 45f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 75f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 85f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 95f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// This file implements the NumericLiteralParser, CharLiteralParser, and 115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// StringLiteralParser interfaces. 125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer// 135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer//===----------------------------------------------------------------------===// 145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Lex/LiteralSupport.h" 165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "clang/Lex/Preprocessor.h" 17500d3297d2a21edeac4d46cbcbe21bc2352c2a28Chris Lattner#include "clang/Lex/LexDiagnostic.h" 18136f93a2b660fc780fc2dba82a6f42ca4dc9164aChris Lattner#include "clang/Basic/TargetInfo.h" 19f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman#include "clang/Basic/ConvertUTF.h" 205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "llvm/ADT/StringExtras.h" 219fe8c74a93ac8e92512615c5f83e7a328b3b0544David Blaikie#include "llvm/Support/ErrorHandling.h" 225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// HexDigitValue - Return the value of the specified hex digit, or -1 if it's 255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// not valid. 265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstatic int HexDigitValue(char C) { 275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (C >= '0' && C <= '9') return C-'0'; 285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (C >= 'a' && C <= 'f') return C-'a'+10; 295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (C >= 'A' && C <= 'F') return C-'A'+10; 305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return -1; 315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 335cee1195584fa8672253139c86e922daeda69b9eDouglas Gregorstatic unsigned getCharWidth(tok::TokenKind kind, const TargetInfo &Target) { 345cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor switch (kind) { 35b219cfc4d75f0a03630b7c4509ef791b7e97b2c8David Blaikie default: llvm_unreachable("Unknown token type!"); 365cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::char_constant: 375cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::string_literal: 385cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::utf8_string_literal: 395cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor return Target.getCharWidth(); 405cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::wide_char_constant: 415cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::wide_string_literal: 425cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor return Target.getWCharWidth(); 435cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::utf16_char_constant: 445cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::utf16_string_literal: 455cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor return Target.getChar16Width(); 465cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::utf32_char_constant: 475cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor case tok::utf32_string_literal: 485cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor return Target.getChar32Width(); 495cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } 505cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor} 515cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor 52e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith/// \brief Produce a diagnostic highlighting some portion of a literal. 53e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith/// 54e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith/// Emits the diagnostic \p DiagID, highlighting the range of characters from 55e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith/// \p TokRangeBegin (inclusive) to \p TokRangeEnd (exclusive), which must be 56e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith/// a substring of a spelling buffer for the token beginning at \p TokBegin. 57e5f0588840b20897631cc8110344fd2745ef4caaRichard Smithstatic DiagnosticBuilder Diag(DiagnosticsEngine *Diags, 58e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith const LangOptions &Features, FullSourceLoc TokLoc, 59e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith const char *TokBegin, const char *TokRangeBegin, 60e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith const char *TokRangeEnd, unsigned DiagID) { 61e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith SourceLocation Begin = 62e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Lexer::AdvanceToTokenCharacter(TokLoc, TokRangeBegin - TokBegin, 63e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith TokLoc.getManager(), Features); 64e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith SourceLocation End = 65e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Lexer::AdvanceToTokenCharacter(Begin, TokRangeEnd - TokRangeBegin, 66e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith TokLoc.getManager(), Features); 67e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith return Diags->Report(Begin, DiagID) 68e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith << CharSourceRange::getCharRange(Begin, End); 69e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith} 70e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith 715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// ProcessCharEscape - Parse a standard C escape sequence, which can occur in 725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// either a character or a string literal. 73e5f0588840b20897631cc8110344fd2745ef4caaRichard Smithstatic unsigned ProcessCharEscape(const char *ThisTokBegin, 74e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith const char *&ThisTokBuf, 755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *ThisTokEnd, bool &HadError, 765cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor FullSourceLoc Loc, unsigned CharWidth, 77e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith DiagnosticsEngine *Diags, 78e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith const LangOptions &Features) { 79e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith const char *EscapeBegin = ThisTokBuf; 80e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith 815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Skip the '\' char. 825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // We know that this character can't be off the end of the buffer, because 855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // that would have been \", which would not have been the end of string. 865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned ResultChar = *ThisTokBuf++; 875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (ResultChar) { 885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // These map to themselves. 895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '\\': case '\'': case '"': case '?': break; 901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // These have fixed mappings. 925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'a': 935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // TODO: K&R: the meaning of '\\a' is different in traditional C 945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 7; 955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'b': 975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 8; 985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'e': 10091f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 101e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, 102e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::ext_nonstandard_escape) << "e"; 1035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 27; 1045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1053c54801fbc67d8df2fed0711a2e2022db6b1bbcfEli Friedman case 'E': 10691f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 107e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, 108e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::ext_nonstandard_escape) << "E"; 1093c54801fbc67d8df2fed0711a2e2022db6b1bbcfEli Friedman ResultChar = 27; 1103c54801fbc67d8df2fed0711a2e2022db6b1bbcfEli Friedman break; 1115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'f': 1125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 12; 1135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'n': 1155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 10; 1165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'r': 1185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 13; 1195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 't': 1215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 9; 1225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'v': 1245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 11; 1255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'x': { // Hex escape. 1275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 0; 1285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ThisTokBuf == ThisTokEnd || !isxdigit(*ThisTokBuf)) { 12991f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 130e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, 131e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::err_hex_escape_no_digits); 1325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer HadError = 1; 1335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Hex escapes are a maximal series of hex digits. 1375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool Overflow = false; 1385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (; ThisTokBuf != ThisTokEnd; ++ThisTokBuf) { 1395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer int CharVal = HexDigitValue(ThisTokBuf[0]); 1405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CharVal == -1) break; 141c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // About to shift out a digit? 142c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner Overflow |= (ResultChar & 0xF0000000) ? true : false; 1435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar <<= 4; 1445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar |= CharVal; 1455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // See if any bits will be truncated when evaluated as a character. 1485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) { 1495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Overflow = true; 1505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar &= ~0U >> (32-CharWidth); 1515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Check for overflow. 15491f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Overflow && Diags) // Too many digits to fit in 155e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, 156e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::warn_hex_escape_too_large); 1575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '0': case '1': case '2': case '3': 1605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '4': case '5': case '6': case '7': { 1615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Octal escapes. 1625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer --ThisTokBuf; 1635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 0; 1645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Octal escapes are a series of octal digits with maximum length 3. 1665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // "\0123" is a two digit sequence equal to "\012" "3". 1675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned NumDigits = 0; 1685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer do { 1695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar <<= 3; 1705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar |= *ThisTokBuf++ - '0'; 1715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++NumDigits; 1725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } while (ThisTokBuf != ThisTokEnd && NumDigits < 3 && 1735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ThisTokBuf[0] >= '0' && ThisTokBuf[0] <= '7'); 1741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Check for overflow. Reject '\777', but not L'\777'. 1765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) { 17791f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 178e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, 179e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::warn_octal_escape_too_large); 1805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar &= ~0U >> (32-CharWidth); 1815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1841eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, these are not valid escapes. 1865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '(': case '{': case '[': case '%': 1875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // GCC accepts these as extensions. We warn about them as such though. 18891f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 189e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, 190e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::ext_nonstandard_escape) 191e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith << std::string(1, ResultChar); 192f01fdff97b245caac98100d232c760b4d0531411Eli Friedman break; 1935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer default: 19491f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags == 0) 195b90f4b3fb94056609da9cca5eef7358d95a363b2Douglas Gregor break; 196e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith 19723ef69d197ba3b5e9602f7161fee50990059502aTed Kremenek if (isgraph(ResultChar)) 198e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, 199e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::ext_unknown_escape) 200e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith << std::string(1, ResultChar); 201ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner else 202e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, EscapeBegin, ThisTokBuf, 203e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::ext_unknown_escape) 204e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith << "x" + llvm::utohexstr(ResultChar); 2055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 2065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 2071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return ResultChar; 2095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 2105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 2110e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff/// ProcessUCNEscape - Read the Universal Character Name, check constraints and 21259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// return the UTF32. 21326b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smithstatic bool ProcessUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf, 21426b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *ThisTokEnd, 21559705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber uint32_t &UcnVal, unsigned short &UcnLen, 216d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie FullSourceLoc Loc, DiagnosticsEngine *Diags, 217be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell const LangOptions &Features, 218be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell bool in_char_string_literal = false) { 21926b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *UcnBegin = ThisTokBuf; 2201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2210e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Skip the '\u' char's. 2220e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff ThisTokBuf += 2; 2230e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff 2240e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (ThisTokBuf == ThisTokEnd || !isxdigit(*ThisTokBuf)) { 2256c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner if (Diags) 226e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, 227e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::err_ucn_escape_no_digits); 22859705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return false; 2290e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 23059705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber UcnLen = (ThisTokBuf[-1] == 'u' ? 4 : 8); 23156bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian unsigned short UcnLenSave = UcnLen; 23259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber for (; ThisTokBuf != ThisTokEnd && UcnLenSave; ++ThisTokBuf, UcnLenSave--) { 2330e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff int CharVal = HexDigitValue(ThisTokBuf[0]); 2340e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (CharVal == -1) break; 2350e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff UcnVal <<= 4; 2360e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff UcnVal |= CharVal; 2370e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 2380e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // If we didn't consume the proper number of digits, there is a problem. 23959705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber if (UcnLenSave) { 240e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith if (Diags) 241e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, 242e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::err_ucn_escape_incomplete); 24359705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return false; 2440e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 24526b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith 246be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Check UCN constraints (C99 6.4.3p2) [C++11 lex.charset p2] 24726b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if ((0xD800 <= UcnVal && UcnVal <= 0xDFFF) || // surrogate codepoints 24826b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith UcnVal > 0x10FFFF) { // maximum legal UTF32 value 24926b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (Diags) 250e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, 251e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::err_ucn_escape_invalid); 25226b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith return false; 25326b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith } 254be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 255be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // C++11 allows UCNs that refer to control characters and basic source 256be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // characters inside character and string literals 25726b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (UcnVal < 0xa0 && 25826b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith (UcnVal != 0x24 && UcnVal != 0x40 && UcnVal != 0x60)) { // $, @, ` 25926b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith bool IsError = (!Features.CPlusPlus0x || !in_char_string_literal); 26026b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (Diags) { 26126b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith char BasicSCSChar = UcnVal; 26226b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (UcnVal >= 0x20 && UcnVal < 0x7f) 263e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, 264e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith IsError ? diag::err_ucn_escape_basic_scs : 265e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::warn_cxx98_compat_literal_ucn_escape_basic_scs) 266e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith << StringRef(&BasicSCSChar, 1); 26726b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith else 268e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, 269e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith IsError ? diag::err_ucn_control_character : 270e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::warn_cxx98_compat_literal_ucn_control_character); 271be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 27226b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (IsError) 27326b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith return false; 274be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 275be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 276e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith if (!Features.CPlusPlus && !Features.C99 && Diags) 277e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, Loc, ThisTokBegin, UcnBegin, ThisTokBuf, 278e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith diag::warn_ucn_not_valid_in_c89); 279e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith 28059705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return true; 28159705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber} 28259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber 283df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith/// MeasureUCNEscape - Determine the number of bytes within the resulting string 284df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith/// which this UCN will occupy. 285df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smithstatic int MeasureUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf, 286df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const char *ThisTokEnd, unsigned CharByteWidth, 287df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const LangOptions &Features, bool &HadError) { 288df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // UTF-32: 4 bytes per escape. 289df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (CharByteWidth == 4) 290df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 4; 291df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 292df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith uint32_t UcnVal = 0; 293df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith unsigned short UcnLen = 0; 294df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith FullSourceLoc Loc; 295df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 296df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (!ProcessUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, UcnVal, 297df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith UcnLen, Loc, 0, Features, true)) { 298df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith HadError = true; 299df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 0; 300df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 301df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 302df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // UTF-16: 2 bytes for BMP, 4 bytes otherwise. 303df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (CharByteWidth == 2) 304df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return UcnVal <= 0xFFFF ? 2 : 4; 305df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 306df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // UTF-8. 307df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (UcnVal < 0x80) 308df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 1; 309df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (UcnVal < 0x800) 310df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 2; 311df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (UcnVal < 0x10000) 312df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 3; 313df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 4; 314df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith} 315df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 31659705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// EncodeUCNEscape - Read the Universal Character Name, check constraints and 31759705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// convert the UTF32 to UTF8 or UTF16. This is a subroutine of 31859705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// StringLiteralParser. When we decide to implement UCN's for identifiers, 31959705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// we will likely rework our support for UCN's. 32026b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smithstatic void EncodeUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf, 32126b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *ThisTokEnd, 322a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner char *&ResultBuf, bool &HadError, 3235cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor FullSourceLoc Loc, unsigned CharByteWidth, 324d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie DiagnosticsEngine *Diags, 325d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie const LangOptions &Features) { 32659705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber typedef uint32_t UTF32; 32759705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber UTF32 UcnVal = 0; 32859705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber unsigned short UcnLen = 0; 32926b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (!ProcessUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, UcnVal, UcnLen, 33026b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith Loc, Diags, Features, true)) { 331df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith HadError = true; 3320e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff return; 3330e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 33459705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber 3355cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert((CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth) && 3365cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor "only character widths of 1, 2, or 4 bytes supported"); 337a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber 3385cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor (void)UcnLen; 3395cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert((UcnLen== 4 || UcnLen== 8) && "only ucn length of 4 or 8 supported"); 3405cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor 3415cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (CharByteWidth == 4) { 342caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // FIXME: Make the type of the result buffer correct instead of 343caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // using reinterpret_cast. 344caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman UTF32 *ResultPtr = reinterpret_cast<UTF32*>(ResultBuf); 345caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *ResultPtr = UcnVal; 346caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultBuf += 4; 3475cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor return; 3485cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } 349a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber 3505cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (CharByteWidth == 2) { 351caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // FIXME: Make the type of the result buffer correct instead of 352caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // using reinterpret_cast. 353caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman UTF16 *ResultPtr = reinterpret_cast<UTF16*>(ResultBuf); 354caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman 35559b26d84b64510158e23d80eba077b844b7e0b04Richard Smith if (UcnVal <= (UTF32)0xFFFF) { 356caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *ResultPtr = UcnVal; 357caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultBuf += 2; 358a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber return; 359a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber } 360a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber 361caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // Convert to UTF16. 362a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber UcnVal -= 0x10000; 363caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *ResultPtr = 0xD800 + (UcnVal >> 10); 364caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *(ResultPtr+1) = 0xDC00 + (UcnVal & 0x3FF); 365caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultBuf += 4; 36656bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian return; 36756bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian } 3685cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor 3695cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert(CharByteWidth == 1 && "UTF-8 encoding is only for 1 byte characters"); 3705cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor 3710e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Now that we've parsed/checked the UCN, we convert from UTF32->UTF8. 3720e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // The conversion below was inspired by: 3730e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // http://www.unicode.org/Public/PROGRAMS/CVTUTF/ConvertUTF.c 3741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // First, we determine how many bytes the result will require. 3754e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff typedef uint8_t UTF8; 3760e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff 3770e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff unsigned short bytesToWrite = 0; 3780e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (UcnVal < (UTF32)0x80) 3790e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 1; 3800e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff else if (UcnVal < (UTF32)0x800) 3810e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 2; 3820e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff else if (UcnVal < (UTF32)0x10000) 3830e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 3; 3840e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff else 3850e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 4; 3861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3870e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff const unsigned byteMask = 0xBF; 3880e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff const unsigned byteMark = 0x80; 3891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3900e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Once the bits are split out into bytes of UTF8, this is a mask OR-ed 3918a5c0cd90b8d607ca284274000ed8716b836d253Steve Naroff // into the first byte, depending on how many bytes follow. 3921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump static const UTF8 firstByteMark[5] = { 3938a5c0cd90b8d607ca284274000ed8716b836d253Steve Naroff 0x00, 0x00, 0xC0, 0xE0, 0xF0 3940e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff }; 3950e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Finally, we write the bytes into ResultBuf. 3960e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff ResultBuf += bytesToWrite; 3970e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff switch (bytesToWrite) { // note: everything falls through. 3980e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 4: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; 3990e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 3: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; 4000e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 2: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; 4010e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 1: *--ResultBuf = (UTF8) (UcnVal | firstByteMark[bytesToWrite]); 4020e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 4030e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Update the buffer. 4040e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff ResultBuf += bytesToWrite; 4050e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff} 4065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// integer-constant: [C99 6.4.4.1] 4095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// decimal-constant integer-suffix 4105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-constant integer-suffix 4115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-constant integer-suffix 41249d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith/// user-defined-integer-literal: [C++11 lex.ext] 413b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith/// decimal-literal ud-suffix 414b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith/// octal-literal ud-suffix 415b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith/// hexadecimal-literal ud-suffix 4161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// decimal-constant: 4175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// nonzero-digit 4185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// decimal-constant digit 4191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// octal-constant: 4205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0 4215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-constant octal-digit 4221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// hexadecimal-constant: 4235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-prefix hexadecimal-digit 4245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-constant hexadecimal-digit 4255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-prefix: one of 4265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0x 0X 4275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// integer-suffix: 4285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// unsigned-suffix [long-suffix] 4295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// unsigned-suffix [long-long-suffix] 4305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// long-suffix [unsigned-suffix] 4315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// long-long-suffix [unsigned-sufix] 4325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// nonzero-digit: 4335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 1 2 3 4 5 6 7 8 9 4345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-digit: 4355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0 1 2 3 4 5 6 7 4365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-digit: 4375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0 1 2 3 4 5 6 7 8 9 4385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// a b c d e f 4395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// A B C D E F 4405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// unsigned-suffix: one of 4415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// u U 4425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// long-suffix: one of 4435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// l L 4441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// long-long-suffix: one of 4455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// ll LL 4465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 4475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// floating-constant: [C99 6.4.4.2] 4485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// TODO: add rules... 4495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 4505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerNumericLiteralParser:: 4515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerNumericLiteralParser(const char *begin, const char *end, 4525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SourceLocation TokLoc, Preprocessor &pp) 4535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer : PP(pp), ThisTokBegin(begin), ThisTokEnd(end) { 4541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 455c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // This routine assumes that the range begin/end matches the regex for integer 456c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // and FP constants (specifically, the 'pp-number' regex), and assumes that 457c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // the byte at "*end" is both valid and not part of the regex. Because of 458c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // this, it doesn't have to check for 'overscan' in various places. 459c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner assert(!isalnum(*end) && *end != '.' && *end != '_' && 460c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner "Lexer didn't maximally munch?"); 4611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = DigitsBegin = begin; 4635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_exponent = false; 4645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_period = false; 465b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith saw_ud_suffix = false; 4665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isLong = false; 4675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isUnsigned = false; 4685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isLongLong = false; 4696e400c286b485e28d04a742ea87860ddfefa672eChris Lattner isFloat = false; 470506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isImaginary = false; 471b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump isMicrosoftInteger = false; 4725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer hadError = false; 4731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (*s == '0') { // parse radix 475368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner ParseNumberStartingWithZero(TokLoc); 476368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (hadError) 477368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 4785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { // the first digit is non-zero 4795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer radix = 10; 4805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = SkipDigits(s); 4815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (s == ThisTokEnd) { 4825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Done. 483016765e3453db2e302efe53905e99cdb25501234Christopher Lamb } else if (isxdigit(*s) && !(*s == 'e' || *s == 'E')) { 484ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-begin), 4855f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner diag::err_invalid_decimal_digit) << StringRef(s, 1); 486ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 4875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return; 4885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else if (*s == '.') { 4895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s++; 4905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_period = true; 4915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = SkipDigits(s); 4921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 4934411f46050216a139ab2fc7ff145ec384d11ec7fChris Lattner if ((*s == 'e' || *s == 'E')) { // exponent 49470f66ab053f36ab3df7a778d09bcb2b4b0fec1f8Chris Lattner const char *Exponent = s; 4955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s++; 4965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_exponent = true; 4975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (*s == '+' || *s == '-') s++; // sign 4985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *first_non_digit = SkipDigits(s); 4990b7f69d789ca1f76582ee9a336e25861fd0c1416Chris Lattner if (first_non_digit != s) { 5005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = first_non_digit; 5010b7f69d789ca1f76582ee9a336e25861fd0c1416Chris Lattner } else { 502ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-begin), 503ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_exponent_has_no_digits); 504ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 5050b7f69d789ca1f76582ee9a336e25861fd0c1416Chris Lattner return; 5065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 5105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SuffixBegin = s; 5111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 512506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Parse the suffix. At this point we can classify whether we have an FP or 513506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // integer constant. 514506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner bool isFPConstant = isFloatingLiteral(); 5151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 516506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Loop over all of the characters of the suffix. If we see something bad, 517506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // we break out of the loop. 518506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner for (; s != ThisTokEnd; ++s) { 519506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner switch (*s) { 520506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'f': // FP Suffix for "float" 521506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'F': 522506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (!isFPConstant) break; // Error for integer constant. 5236e400c286b485e28d04a742ea87860ddfefa672eChris Lattner if (isFloat || isLong) break; // FF, LF invalid. 5246e400c286b485e28d04a742ea87860ddfefa672eChris Lattner isFloat = true; 525506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 526506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'u': 527506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'U': 528506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isFPConstant) break; // Error for floating constant. 529506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isUnsigned) break; // Cannot be repeated. 530506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isUnsigned = true; 531506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 532506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'l': 533506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'L': 534506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isLong || isLongLong) break; // Cannot be repeated. 5356e400c286b485e28d04a742ea87860ddfefa672eChris Lattner if (isFloat) break; // LF invalid. 5361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 537506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Check for long long. The L's need to be adjacent and the same case. 538506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (s+1 != ThisTokEnd && s[1] == s[0]) { 539506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isFPConstant) break; // long long invalid for floats. 540506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isLongLong = true; 541506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner ++s; // Eat both of them. 542506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner } else { 5435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isLong = true; 5445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 545506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 546506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'i': 547c637415a96c16abc7e28ef83c6c105716f7e8936Chris Lattner case 'I': 5484e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (PP.getLangOpts().MicrosoftExt) { 549a8be02b655b76e4dbe776b0c62bc3c450dc6feabFariborz Jahanian if (isFPConstant || isLong || isLongLong) break; 5506e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes 5510c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff // Allow i8, i16, i32, i64, and i128. 552b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump if (s + 1 != ThisTokEnd) { 553b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump switch (s[1]) { 554b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '8': 555b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump s += 2; // i8 suffix 556b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump isMicrosoftInteger = true; 5576e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 558b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '1': 5596e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 2 == ThisTokEnd) break; 560d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[2] == '6') { 561d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 3; // i16 suffix 562d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 563d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 5646e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes else if (s[2] == '2') { 5656e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 3 == ThisTokEnd) break; 566d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[3] == '8') { 567d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 4; // i128 suffix 568d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 569d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 570b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump } 5716e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 572b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '3': 5736e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 2 == ThisTokEnd) break; 574d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[2] == '2') { 575d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 3; // i32 suffix 576d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isLong = true; 577d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 578d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 5796e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 580b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '6': 5816e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 2 == ThisTokEnd) break; 582d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[2] == '4') { 583d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 3; // i64 suffix 584d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isLongLong = true; 585d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 586d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 5876e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 588b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump default: 589b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump break; 590b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump } 591b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump break; 5920c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff } 5930c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff } 5940c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff // fall through. 595506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'j': 596506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'J': 597506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isImaginary) break; // Cannot be repeated. 598506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-begin), 599506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner diag::ext_imaginary_constant); 600506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isImaginary = true; 601506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 6025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 603b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith // If we reached here, there was an error or a ud-suffix. 604506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner break; 605506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner } 6061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 607506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (s != ThisTokEnd) { 6084e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (PP.getLangOpts().CPlusPlus0x && s == SuffixBegin && *s == '_') { 609b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith // We have a ud-suffix! By C++11 [lex.ext]p10, ud-suffixes not starting 610b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith // with an '_' are ill-formed. 611b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith saw_ud_suffix = true; 612b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith return; 613b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith } 614b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith 615b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith // Report an error if there are any. 616b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, SuffixBegin-begin), 617ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner isFPConstant ? diag::err_invalid_suffix_float_constant : 618ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_invalid_suffix_integer_constant) 6195f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner << StringRef(SuffixBegin, ThisTokEnd-SuffixBegin); 620ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 621506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner return; 6225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 625368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// ParseNumberStartingWithZero - This method is called when the first character 626368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// of the number is found to be a zero. This means it is either an octal 627368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// number (like '04') or a hex number ('0x123a') a binary number ('0b1010') or 6281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// a floating point number (01239.123e4). Eat the prefix, determining the 629368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// radix etc. 630368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattnervoid NumericLiteralParser::ParseNumberStartingWithZero(SourceLocation TokLoc) { 631368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner assert(s[0] == '0' && "Invalid method call"); 632368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 6331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 634368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Handle a hex number like 0x1234. 635368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if ((*s == 'x' || *s == 'X') && (isxdigit(s[1]) || s[1] == '.')) { 636368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 637368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 16; 638368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner DigitsBegin = s; 639368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipHexDigits(s); 64066b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman bool noSignificand = (s == DigitsBegin); 641368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (s == ThisTokEnd) { 642368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Done. 643368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else if (*s == '.') { 644368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 645368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_period = true; 64666b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman const char *floatDigitsBegin = s; 647368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipHexDigits(s); 64866b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman noSignificand &= (floatDigitsBegin == s); 64966b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman } 65066b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman 65166b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman if (noSignificand) { 65266b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), \ 65366b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman diag::err_hexconstant_requires_digits); 65466b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman hadError = true; 65566b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman return; 656368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 65766b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman 658368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // A binary exponent can appear with or with a '.'. If dotted, the 6591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // binary exponent is required. 6601155c42e7b1b4e401bb0a331a6d715d637958c75Douglas Gregor if (*s == 'p' || *s == 'P') { 661368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *Exponent = s; 662368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 663368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_exponent = true; 664368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == '+' || *s == '-') s++; // sign 665368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *first_non_digit = SkipDigits(s); 6666ea623823f8532670480425b573f35115404b4a0Chris Lattner if (first_non_digit == s) { 667ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-ThisTokBegin), 668ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_exponent_has_no_digits); 669ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 6706ea623823f8532670480425b573f35115404b4a0Chris Lattner return; 671368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 6726ea623823f8532670480425b573f35115404b4a0Chris Lattner s = first_non_digit; 6731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6744e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (!PP.getLangOpts().HexFloats) 675ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(TokLoc, diag::ext_hexconstant_invalid); 676368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else if (saw_period) { 677ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), 678ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_hexconstant_requires_exponent); 679ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 680368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 681368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 682368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 6831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 684368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Handle simple binary numbers 0b01010 685368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == 'b' || *s == 'B') { 686368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // 0b101010 is a GCC extension. 687413d355e38755a71f106dbc0ac900ca989070916Chris Lattner PP.Diag(TokLoc, diag::ext_binary_literal); 688368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner ++s; 689368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 2; 690368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner DigitsBegin = s; 691368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipBinaryDigits(s); 692368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (s == ThisTokEnd) { 693368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Done. 694368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else if (isxdigit(*s)) { 695ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), 6965f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner diag::err_invalid_binary_digit) << StringRef(s, 1); 697ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 698368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 699413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // Other suffixes will be diagnosed by the caller. 700368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 701368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 7021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 703368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // For now, the radix is set to 8. If we discover that we have a 704368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // floating point constant, the radix will change to 10. Octal floating 7051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // point constants are not permitted (only decimal and hexadecimal). 706368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 8; 707368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner DigitsBegin = s; 708368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipOctalDigits(s); 709368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (s == ThisTokEnd) 710368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; // Done, simple octal number like 01234 7111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 712413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // If we have some other non-octal digit that *is* a decimal digit, see if 713413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // this is part of a floating point number like 094.123 or 09e1. 714413d355e38755a71f106dbc0ac900ca989070916Chris Lattner if (isdigit(*s)) { 715413d355e38755a71f106dbc0ac900ca989070916Chris Lattner const char *EndDecimal = SkipDigits(s); 716413d355e38755a71f106dbc0ac900ca989070916Chris Lattner if (EndDecimal[0] == '.' || EndDecimal[0] == 'e' || EndDecimal[0] == 'E') { 717413d355e38755a71f106dbc0ac900ca989070916Chris Lattner s = EndDecimal; 718413d355e38755a71f106dbc0ac900ca989070916Chris Lattner radix = 10; 719413d355e38755a71f106dbc0ac900ca989070916Chris Lattner } 720413d355e38755a71f106dbc0ac900ca989070916Chris Lattner } 7211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 722413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // If we have a hex digit other than 'e' (which denotes a FP exponent) then 723413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // the code is using an incorrect base. 724368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (isxdigit(*s) && *s != 'e' && *s != 'E') { 725ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), 7265f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner diag::err_invalid_octal_digit) << StringRef(s, 1); 727ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 728368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 729368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 7301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 731368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == '.') { 732368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 733368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 10; 734368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_period = true; 735413d355e38755a71f106dbc0ac900ca989070916Chris Lattner s = SkipDigits(s); // Skip suffix. 736368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 737368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == 'e' || *s == 'E') { // exponent 738368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *Exponent = s; 739368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 740368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 10; 741368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_exponent = true; 742368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == '+' || *s == '-') s++; // sign 743368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *first_non_digit = SkipDigits(s); 744368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (first_non_digit != s) { 745368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = first_non_digit; 746368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else { 7471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-ThisTokBegin), 748ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_exponent_has_no_digits); 749ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 750368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 751368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 752368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 753368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner} 754368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner 755368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner 7565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// GetIntegerValue - Convert this numeric literal value to an APInt that 7575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// matches Val's input width. If there is an overflow, set Val to the low bits 7585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// of the result and return true. Otherwise, return false. 7595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerbool NumericLiteralParser::GetIntegerValue(llvm::APInt &Val) { 760a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // Fast path: Compute a conservative bound on the maximum number of 761a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // bits per digit in this radix. If we can't possibly overflow a 762a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // uint64 based on that bound then do the simple conversion to 763a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // integer. This avoids the expensive overflow checking below, and 764a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // handles the common cases that matter (small decimal integers and 765a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // hex/octal values which don't overflow). 766a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar unsigned MaxBitsPerDigit = 1; 7671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump while ((1U << MaxBitsPerDigit) < radix) 768a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar MaxBitsPerDigit += 1; 769a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar if ((SuffixBegin - DigitsBegin) * MaxBitsPerDigit <= 64) { 770a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar uint64_t N = 0; 771a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar for (s = DigitsBegin; s != SuffixBegin; ++s) 772a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar N = N*radix + HexDigitValue(*s); 773a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar 774a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // This will truncate the value to Val's input width. Simply check 775a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // for overflow by comparing. 776a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar Val = N; 777a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar return Val.getZExtValue() != N; 778a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar } 779a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar 7805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val = 0; 7815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = DigitsBegin; 7825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APInt RadixVal(Val.getBitWidth(), radix); 7845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APInt CharVal(Val.getBitWidth(), 0); 7855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APInt OldVal = Val; 7861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool OverflowOccurred = false; 7885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer while (s < SuffixBegin) { 7895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned C = HexDigitValue(*s++); 7901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this letter is out of bound for this radix, reject it. 7925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(C < radix && "NumericLiteralParser ctor should have rejected this"); 7931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer CharVal = C; 7951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Add the digit to the value in the appropriate radix. If adding in digits 7975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // made the value smaller, then this overflowed. 7985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer OldVal = Val; 7995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Multiply by radix, did overflow occur on the multiply? 8015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val *= RadixVal; 8025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer OverflowOccurred |= Val.udiv(RadixVal) != OldVal; 8035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Add value, did overflow occur on the value? 805d70cb645702bdbb42aee58403306a7c47e0d901cDaniel Dunbar // (a + b) ult b <=> overflow 8065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val += CharVal; 8075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer OverflowOccurred |= Val.ult(CharVal); 8085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 8095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return OverflowOccurred; 8105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 81294c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCallllvm::APFloat::opStatus 81394c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCallNumericLiteralParser::GetFloatValue(llvm::APFloat &Result) { 814427d5af5b601985093b6b4b33ba1e30fc24d86dcTed Kremenek using llvm::APFloat; 8151eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 816e9f195f15ffe96d0a220c872ab12d0630a633c44Erick Tryzelaar unsigned n = std::min(SuffixBegin - ThisTokBegin, ThisTokEnd - ThisTokBegin); 81794c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCall return Result.convertFromString(StringRef(ThisTokBegin, n), 81894c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCall APFloat::rmNearestTiesToEven); 8195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 82258f9ce1664cd4fa67da48679a11df6aed25ce1fcJames Dennett/// \verbatim 8235cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// user-defined-character-literal: [C++11 lex.ext] 8245cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// character-literal ud-suffix 8255cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// ud-suffix: 8265cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// identifier 8275cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// character-literal: [C++11 lex.ccon] 8282fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// ' c-char-sequence ' 8292fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// u' c-char-sequence ' 8302fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// U' c-char-sequence ' 8312fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// L' c-char-sequence ' 8322fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// c-char-sequence: 8332fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// c-char 8342fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// c-char-sequence c-char 8352fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// c-char: 8362fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// any member of the source character set except the single-quote ', 8372fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// backslash \, or new-line character 8382fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// escape-sequence 8392fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// universal-character-name 8405cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// escape-sequence: 8412fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// simple-escape-sequence 8422fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// octal-escape-sequence 8432fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence 8442fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// simple-escape-sequence: 845ddddd48da72bc29d1c3f388ed91ea5549328129eNAKAMURA Takumi/// one of \' \" \? \\ \a \b \f \n \r \t \v 8462fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// octal-escape-sequence: 8472fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit 8482fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit octal-digit 8492fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit octal-digit octal-digit 8502fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence: 8512fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \x hexadecimal-digit 8522fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence hexadecimal-digit 8535cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// universal-character-name: [C++11 lex.charset] 8542fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \u hex-quad 8552fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \U hex-quad hex-quad 8562fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hex-quad: 8572fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hex-digit hex-digit hex-digit hex-digit 85858f9ce1664cd4fa67da48679a11df6aed25ce1fcJames Dennett/// \endverbatim 8592fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// 8605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerCharLiteralParser::CharLiteralParser(const char *begin, const char *end, 8615cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor SourceLocation Loc, Preprocessor &PP, 8625cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor tok::TokenKind kind) { 863be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // At this point we know that the character matches the regex "(L|u|U)?'.*'". 8645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer HadError = false; 8651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8665cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Kind = kind; 8675cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor 86826b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *TokBegin = begin; 86926b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith 870be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Skip over wide character determinant. 871be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (Kind != tok::char_constant) { 8725cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor ++begin; 8735cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } 8741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Skip over the entry quote. 8765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(begin[0] == '\'' && "Invalid token lexed"); 8775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++begin; 8785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8795cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // Remove an optional ud-suffix. 8805cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith if (end[-1] != '\'') { 8815cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith const char *UDSuffixEnd = end; 8825cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith do { 8835cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith --end; 8845cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } while (end[-1] != '\''); 8855cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith UDSuffixBuf.assign(end, UDSuffixEnd); 88626b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith UDSuffixOffset = end - TokBegin; 8875cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } 8885cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 889be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Trim the ending quote. 8905cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith assert(end != begin && "Invalid token lexed"); 891be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell --end; 892be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 8931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // FIXME: The "Value" is an uint64_t so we can handle char literals of 894fc8f0e14ad142ed811e90fbd9a30e419e301c717Chris Lattner // up to 64-bits. 8955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // FIXME: This extensively assumes that 'char' is 8-bits. 89698be4943e8dc4f3905629a7102668960873cf863Chris Lattner assert(PP.getTargetInfo().getCharWidth() == 8 && 8975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer "Assumes char is 8 bits"); 898e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner assert(PP.getTargetInfo().getIntWidth() <= 64 && 899e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner (PP.getTargetInfo().getIntWidth() & 7) == 0 && 900e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner "Assumes sizeof(int) on target is <= 64 and a multiple of char"); 901e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner assert(PP.getTargetInfo().getWCharWidth() <= 64 && 902e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner "Assumes sizeof(wchar) on target is <= 64"); 9034bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta 904be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell SmallVector<uint32_t,4> codepoint_buffer; 905be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell codepoint_buffer.resize(end-begin); 906be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell uint32_t *buffer_begin = &codepoint_buffer.front(); 907be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell uint32_t *buffer_end = buffer_begin + codepoint_buffer.size(); 908be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 909be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Unicode escapes representing characters that cannot be correctly 910be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // represented in a single code unit are disallowed in character literals 911be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // by this implementation. 912be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell uint32_t largest_character_for_kind; 913be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (tok::wide_char_constant == Kind) { 914be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell largest_character_for_kind = 0xFFFFFFFFu >> (32-PP.getTargetInfo().getWCharWidth()); 915be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else if (tok::utf16_char_constant == Kind) { 916be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell largest_character_for_kind = 0xFFFF; 917be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else if (tok::utf32_char_constant == Kind) { 918be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell largest_character_for_kind = 0x10FFFF; 919be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else { 920be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell largest_character_for_kind = 0x7Fu; 921be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 9225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 923be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell while (begin!=end) { 924be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Is this a span of non-escape characters? 925be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (begin[0] != '\\') { 926be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell char const *start = begin; 927be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell do { 928be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell ++begin; 929be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } while (begin != end && *begin != '\\'); 930be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 93191359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman char const *tmp_in_start = start; 93291359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman uint32_t *tmp_out_start = buffer_begin; 933be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell ConversionResult res = 934be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell ConvertUTF8toUTF32(reinterpret_cast<UTF8 const **>(&start), 935be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell reinterpret_cast<UTF8 const *>(begin), 936be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell &buffer_begin,buffer_end,strictConversion); 937be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (res!=conversionOK) { 93891359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // If we see bad encoding for unprefixed character literals, warn and 93991359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // simply copy the byte values, for compatibility with gcc and 94091359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // older versions of clang. 94191359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman bool NoErrorOnBadEncoding = isAscii(); 94291359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman unsigned Msg = diag::err_bad_character_encoding; 94391359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman if (NoErrorOnBadEncoding) 94491359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman Msg = diag::warn_bad_character_encoding; 94591359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman PP.Diag(Loc, Msg); 94691359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman if (NoErrorOnBadEncoding) { 94791359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman start = tmp_in_start; 94891359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman buffer_begin = tmp_out_start; 94991359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman for ( ; start != begin; ++start, ++buffer_begin) 95091359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman *buffer_begin = static_cast<uint8_t>(*start); 95191359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman } else { 95291359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman HadError = true; 95391359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman } 9545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 95591359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman for (; tmp_out_start <buffer_begin; ++tmp_out_start) { 95691359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman if (*tmp_out_start > largest_character_for_kind) { 957be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell HadError = true; 958be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell PP.Diag(Loc, diag::err_character_too_large); 959be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 9601c6c64b5181a960c7d4cace4995a938d4dfa6fbfChris Lattner } 9615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 962be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 963be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell continue; 9645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 965be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Is this a Universal Character Name excape? 966be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (begin[1] == 'u' || begin[1] == 'U') { 967be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell unsigned short UcnLen = 0; 96826b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (!ProcessUCNEscape(TokBegin, begin, end, *buffer_begin, UcnLen, 969be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell FullSourceLoc(Loc, PP.getSourceManager()), 9704e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie &PP.getDiagnostics(), PP.getLangOpts(), 971be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell true)) 972be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell { 973be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell HadError = true; 974be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else if (*buffer_begin > largest_character_for_kind) { 975be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell HadError = true; 976e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith PP.Diag(Loc, diag::err_character_too_large); 977be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 9781eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 979be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell ++buffer_begin; 980be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell continue; 981be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 982be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell unsigned CharWidth = getCharWidth(Kind, PP.getTargetInfo()); 983be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell uint64_t result = 984e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith ProcessCharEscape(TokBegin, begin, end, HadError, 985e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith FullSourceLoc(Loc,PP.getSourceManager()), 986e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith CharWidth, &PP.getDiagnostics(), PP.getLangOpts()); 987be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell *buffer_begin++ = result; 988e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner } 989e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner 990be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell unsigned NumCharsSoFar = buffer_begin-&codepoint_buffer.front(); 991be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 992e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner if (NumCharsSoFar > 1) { 993be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (isWide()) 9945cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor PP.Diag(Loc, diag::warn_extraneous_char_constant); 995be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell else if (isAscii() && NumCharsSoFar == 4) 996be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell PP.Diag(Loc, diag::ext_four_char_character_literal); 997be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell else if (isAscii()) 998e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner PP.Diag(Loc, diag::ext_multichar_character_literal); 999e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner else 1000be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell PP.Diag(Loc, diag::err_multichar_utf_character_literal); 10012a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman IsMultiChar = true; 1002930b71a4a7dedf70a73e5fd875bae7df452b80a9Daniel Dunbar } else 1003930b71a4a7dedf70a73e5fd875bae7df452b80a9Daniel Dunbar IsMultiChar = false; 10044bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta 1005be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell llvm::APInt LitVal(PP.getTargetInfo().getIntWidth(), 0); 1006be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 1007be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Narrow character literals act as though their value is concatenated 1008be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // in this implementation, but warn on overflow. 1009be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell bool multi_char_too_long = false; 1010be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (isAscii() && isMultiChar()) { 1011be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell LitVal = 0; 1012be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell for (size_t i=0;i<NumCharsSoFar;++i) { 1013be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // check for enough leading zeros to shift into 1014be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell multi_char_too_long |= (LitVal.countLeadingZeros() < 8); 1015be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell LitVal <<= 8; 1016be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell LitVal = LitVal + (codepoint_buffer[i] & 0xFF); 1017be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 1018be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else if (NumCharsSoFar > 0) { 1019be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // otherwise just take the last character 1020be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell LitVal = buffer_begin[-1]; 1021be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 1022be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 1023be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (!HadError && multi_char_too_long) { 1024be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell PP.Diag(Loc,diag::warn_char_constant_too_large); 1025be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 1026be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 10274bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta // Transfer the value from APInt to uint64_t 10284bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta Value = LitVal.getZExtValue(); 10291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is a single narrow character, sign extend it (e.g. '\xFF' is "-1") 10315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // if 'char' is signed for this target (C99 6.4.4.4p10). Note that multiple 10325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // character constants are not sign extended in the this implementation: 10335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // '\xFF\xFF' = 65536 and '\x0\xFF' = 255, which matches GCC. 10345cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (isAscii() && NumCharsSoFar == 1 && (Value & 128) && 10354e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie PP.getLangOpts().CharIsSigned) 10365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Value = (signed char)Value; 10375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1039a1263cfb87151771fd74a1d2b676ae2ba172b72cJames Dennett/// \verbatim 10402fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// string-literal: [C++0x lex.string] 10412fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// encoding-prefix " [s-char-sequence] " 10422fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// encoding-prefix R raw-string 10432fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// encoding-prefix: 10442fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// u8 10452fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// u 10462fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// U 10472fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// L 10485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char-sequence: 10495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char 10505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char-sequence s-char 10515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char: 10522fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// any member of the source character set except the double-quote ", 10532fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// backslash \, or new-line character 10542fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// escape-sequence 10555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// universal-character-name 10562fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// raw-string: 10572fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// " d-char-sequence ( r-char-sequence ) d-char-sequence " 10582fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// r-char-sequence: 10592fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// r-char 10602fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// r-char-sequence r-char 10612fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// r-char: 10622fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// any member of the source character set, except a right parenthesis ) 10632fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// followed by the initial d-char-sequence (which may be empty) 10642fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// followed by a double quote ". 10652fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// d-char-sequence: 10662fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// d-char 10672fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// d-char-sequence d-char 10682fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// d-char: 10692fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// any member of the basic source character set except: 10702fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// space, the left parenthesis (, the right parenthesis ), 10712fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// the backslash \, and the control characters representing horizontal 10722fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// tab, vertical tab, form feed, and newline. 10732fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// escape-sequence: [C++0x lex.ccon] 10742fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// simple-escape-sequence 10752fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// octal-escape-sequence 10762fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence 10772fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// simple-escape-sequence: 1078ddddd48da72bc29d1c3f388ed91ea5549328129eNAKAMURA Takumi/// one of \' \" \? \\ \a \b \f \n \r \t \v 10792fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// octal-escape-sequence: 10802fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit 10812fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit octal-digit 10822fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit octal-digit octal-digit 10832fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence: 10842fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \x hexadecimal-digit 10852fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence hexadecimal-digit 10865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// universal-character-name: 10875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// \u hex-quad 10885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// \U hex-quad hex-quad 10895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hex-quad: 10905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hex-digit hex-digit hex-digit hex-digit 1091a1263cfb87151771fd74a1d2b676ae2ba172b72cJames Dennett/// \endverbatim 10925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 10935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerStringLiteralParser:: 1094d217773f106856a11879ec79dc468efefaf2ee75Chris LattnerStringLiteralParser(const Token *StringToks, unsigned NumStringToks, 10950833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner Preprocessor &PP, bool Complain) 10964e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie : SM(PP.getSourceManager()), Features(PP.getLangOpts()), 1097403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis Target(PP.getTargetInfo()), Diags(Complain ? &PP.getDiagnostics() : 0), 10985cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor MaxTokenLength(0), SizeBound(0), CharByteWidth(0), Kind(tok::unknown), 10995cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor ResultPtr(ResultBuf.data()), hadError(false), Pascal(false) { 11000833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner init(StringToks, NumStringToks); 11010833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner} 11020833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner 11030833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattnervoid StringLiteralParser::init(const Token *StringToks, unsigned NumStringToks){ 1104403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis // The literal token may have come from an invalid source location (e.g. due 1105403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis // to a PCH error), in which case the token length will be 0. 11063144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis if (NumStringToks == 0 || StringToks[0].getLength() < 2) 11073144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis return DiagnoseLexingError(SourceLocation()); 1108403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis 11095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Scan all of the string portions, remember the max individual token length, 11105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // computing a bound on the concatenated string length, and see whether any 11115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // piece is a wide-string. If any of the string portions is a wide-string 11125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // literal, the result is a wide-string literal [C99 6.4.5p4]. 1113403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis assert(NumStringToks && "expected at least one token"); 11146cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt MaxTokenLength = StringToks[0].getLength(); 1115403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis assert(StringToks[0].getLength() >= 2 && "literal token is invalid!"); 11166cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt SizeBound = StringToks[0].getLength()-2; // -2 for "". 11175cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Kind = StringToks[0].getKind(); 11186cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt 11196cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt hadError = false; 11205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 11215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Implement Translation Phase #6: concatenation of string literals 11225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// (C99 5.1.1.2p1). The common case is only one string fragment. 11235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 1; i != NumStringToks; ++i) { 11243144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis if (StringToks[i].getLength() < 2) 11253144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis return DiagnoseLexingError(StringToks[i].getLocation()); 1126403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis 11275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // The string could be shorter than this if it needs cleaning, but this is a 11285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // reasonable bound, which is all we need. 1129403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis assert(StringToks[i].getLength() >= 2 && "literal token is invalid!"); 11306cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt SizeBound += StringToks[i].getLength()-2; // -2 for "". 11311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remember maximum string piece length. 11336cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt if (StringToks[i].getLength() > MaxTokenLength) 11346cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt MaxTokenLength = StringToks[i].getLength(); 11351eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11365cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // Remember if we see any wide or utf-8/16/32 strings. 11375cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // Also check for illegal concatenations. 11385cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (StringToks[i].isNot(Kind) && StringToks[i].isNot(tok::string_literal)) { 11395cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (isAscii()) { 11405cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Kind = StringToks[i].getKind(); 11415cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } else { 11425cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (Diags) 1143e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diags->Report(StringToks[i].getLocation(), 11445cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor diag::err_unsupported_string_concat); 11455cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor hadError = true; 11465cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } 11475cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } 11485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1149dbb1ecc32ca122b07b7c98fd0a8f6f53985adaccChris Lattner 11505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Include space for the null terminator. 11515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++SizeBound; 11521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // TODO: K&R warning: "traditional C rejects string constant concatenation" 11541eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11555cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // Get the width in bytes of char/wchar_t/char16_t/char32_t 11565cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor CharByteWidth = getCharWidth(Kind, Target); 11575cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple"); 11585cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor CharByteWidth /= 8; 11591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // The output buffer size needs to be large enough to hold wide characters. 11615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // This is a worst-case assumption which basically corresponds to L"" "long". 11625cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor SizeBound *= CharByteWidth; 11631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Size the temporary buffer to hold the result string data. 11655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultBuf.resize(SizeBound); 11661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Likewise, but for each string piece. 1168f7ccbad5d9949e7ddd1cbef43d482553b811e026Dylan Noblesmith SmallString<512> TokenBuf; 11695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer TokenBuf.resize(MaxTokenLength); 11701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Loop over all the strings, getting their spelling, and expanding them to 11725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // wide strings as appropriate. 11735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultPtr = &ResultBuf[0]; // Next byte to fill in. 11741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1175ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson Pascal = false; 11761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11775cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith SourceLocation UDSuffixTokLoc; 11785cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 11795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 0, e = NumStringToks; i != e; ++i) { 11805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *ThisTokBuf = &TokenBuf[0]; 11815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Get the spelling of the token, which eliminates trigraphs, etc. We know 11825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // that ThisTokBuf points to a buffer that is big enough for the whole token 11835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // and 'spelled' tokens can only shrink. 118450f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor bool StringInvalid = false; 11850833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner unsigned ThisTokLen = 1186b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner Lexer::getSpelling(StringToks[i], ThisTokBuf, SM, Features, 1187b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner &StringInvalid); 11883144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis if (StringInvalid) 11893144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis return DiagnoseLexingError(StringToks[i].getLocation()); 119050f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor 119126b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *ThisTokBegin = ThisTokBuf; 11925cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith const char *ThisTokEnd = ThisTokBuf+ThisTokLen; 11935cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 11945cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // Remove an optional ud-suffix. 11955cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith if (ThisTokEnd[-1] != '"') { 11965cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith const char *UDSuffixEnd = ThisTokEnd; 11975cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith do { 11985cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith --ThisTokEnd; 11995cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } while (ThisTokEnd[-1] != '"'); 12005cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 12015cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith StringRef UDSuffix(ThisTokEnd, UDSuffixEnd - ThisTokEnd); 12025cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 12035cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith if (UDSuffixBuf.empty()) { 12045cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith UDSuffixBuf.assign(UDSuffix); 1205dd66be718f23c8149d74ae8b011b002e11e8d5baRichard Smith UDSuffixToken = i; 1206dd66be718f23c8149d74ae8b011b002e11e8d5baRichard Smith UDSuffixOffset = ThisTokEnd - ThisTokBuf; 12075cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith UDSuffixTokLoc = StringToks[i].getLocation(); 12085cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } else if (!UDSuffixBuf.equals(UDSuffix)) { 12095cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // C++11 [lex.ext]p8: At the end of phase 6, if a string literal is the 12105cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // result of a concatenation involving at least one user-defined-string- 12115cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // literal, all the participating user-defined-string-literals shall 12125cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // have the same ud-suffix. 12135cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith if (Diags) { 12145cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith SourceLocation TokLoc = StringToks[i].getLocation(); 12155cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith Diags->Report(TokLoc, diag::err_string_concat_mixed_suffix) 12165cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith << UDSuffixBuf << UDSuffix 12175cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith << SourceRange(UDSuffixTokLoc, UDSuffixTokLoc) 12185cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith << SourceRange(TokLoc, TokLoc); 12195cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } 12205cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith hadError = true; 12215cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } 12225cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } 12235cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 12245cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // Strip the end quote. 12255cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith --ThisTokEnd; 12265cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 12275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // TODO: Input character set mapping support. 12281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12291661d717563d6a27dec3da69deba2b2efaa45802Craig Topper // Skip marker for wide or unicode strings. 12305cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (ThisTokBuf[0] == 'L' || ThisTokBuf[0] == 'u' || ThisTokBuf[0] == 'U') { 12315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 12325cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // Skip 8 of u8 marker for utf8 strings. 12335cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (ThisTokBuf[0] == '8') 12345cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor ++ThisTokBuf; 123556bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian } 12361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12372fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Check for raw string 12382fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (ThisTokBuf[0] == 'R') { 12392fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ThisTokBuf += 2; // skip R" 12401eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12412fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper const char *Prefix = ThisTokBuf; 12422fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper while (ThisTokBuf[0] != '(') 1243ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson ++ThisTokBuf; 12442fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ++ThisTokBuf; // skip '(' 12452fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 124649d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith // Remove same number of characters from the end 124749d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith ThisTokEnd -= ThisTokBuf - Prefix; 124849d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith assert(ThisTokEnd >= ThisTokBuf && "malformed raw string literal"); 12492fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 12502fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Copy the string over 1251e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith if (CopyStringFragment(StringToks[i], ThisTokBegin, 1252e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith StringRef(ThisTokBuf, ThisTokEnd - ThisTokBuf))) 1253e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith hadError = true; 12542fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } else { 125507a075870110a8376ddc1cd09412a0ec00987153Argyrios Kyrtzidis if (ThisTokBuf[0] != '"') { 125607a075870110a8376ddc1cd09412a0ec00987153Argyrios Kyrtzidis // The file may have come from PCH and then changed after loading the 125707a075870110a8376ddc1cd09412a0ec00987153Argyrios Kyrtzidis // PCH; Fail gracefully. 12583144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis return DiagnoseLexingError(StringToks[i].getLocation()); 125907a075870110a8376ddc1cd09412a0ec00987153Argyrios Kyrtzidis } 12602fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ++ThisTokBuf; // skip " 12612fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 12622fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Check if this is a pascal string 12632fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (Features.PascalStrings && ThisTokBuf + 1 != ThisTokEnd && 12642fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ThisTokBuf[0] == '\\' && ThisTokBuf[1] == 'p') { 12651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12662fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // If the \p sequence is found in the first token, we have a pascal string 12672fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Otherwise, if we already have a pascal string, ignore the first \p 12682fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (i == 0) { 12695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 12702fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper Pascal = true; 12712fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } else if (Pascal) 12722fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ThisTokBuf += 2; 12735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 12741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12752fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper while (ThisTokBuf != ThisTokEnd) { 12762fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Is this a span of non-escape characters? 12772fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (ThisTokBuf[0] != '\\') { 12782fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper const char *InStart = ThisTokBuf; 12792fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper do { 12802fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ++ThisTokBuf; 12812fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } while (ThisTokBuf != ThisTokEnd && ThisTokBuf[0] != '\\'); 12822fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 12832fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Copy the character span over. 1284e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith if (CopyStringFragment(StringToks[i], ThisTokBegin, 1285e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith StringRef(InStart, ThisTokBuf - InStart))) 1286e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith hadError = true; 12872fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper continue; 12882fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } 12892fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Is this a Universal Character Name escape? 12902fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (ThisTokBuf[1] == 'u' || ThisTokBuf[1] == 'U') { 129126b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith EncodeUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, 129226b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith ResultPtr, hadError, 129326b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith FullSourceLoc(StringToks[i].getLocation(), SM), 12942fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper CharByteWidth, Diags, Features); 12952fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper continue; 12962fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } 12972fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Otherwise, this is a non-UCN escape character. Process it. 12982fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper unsigned ResultChar = 1299e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith ProcessCharEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, hadError, 13002fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper FullSourceLoc(StringToks[i].getLocation(), SM), 1301e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith CharByteWidth*8, Diags, Features); 13022fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 1303caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman if (CharByteWidth == 4) { 1304caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // FIXME: Make the type of the result buffer correct instead of 1305caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // using reinterpret_cast. 1306caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman UTF32 *ResultWidePtr = reinterpret_cast<UTF32*>(ResultPtr); 13079b483df983759d51d61d54e8ae34bff423d15403Nico Weber *ResultWidePtr = ResultChar; 1308caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultPtr += 4; 1309caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman } else if (CharByteWidth == 2) { 1310caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // FIXME: Make the type of the result buffer correct instead of 1311caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // using reinterpret_cast. 1312caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman UTF16 *ResultWidePtr = reinterpret_cast<UTF16*>(ResultPtr); 13139b483df983759d51d61d54e8ae34bff423d15403Nico Weber *ResultWidePtr = ResultChar & 0xFFFF; 1314caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultPtr += 2; 1315caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman } else { 1316caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman assert(CharByteWidth == 1 && "Unexpected char width"); 1317caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *ResultPtr++ = ResultChar & 0xFF; 1318caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman } 13192fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } 13205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 13215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 13221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1323bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner if (Pascal) { 132422508f410b3d727d5c557af3304c0a1bad94999eEli Friedman if (CharByteWidth == 4) { 132522508f410b3d727d5c557af3304c0a1bad94999eEli Friedman // FIXME: Make the type of the result buffer correct instead of 132622508f410b3d727d5c557af3304c0a1bad94999eEli Friedman // using reinterpret_cast. 132722508f410b3d727d5c557af3304c0a1bad94999eEli Friedman UTF32 *ResultWidePtr = reinterpret_cast<UTF32*>(ResultBuf.data()); 132822508f410b3d727d5c557af3304c0a1bad94999eEli Friedman ResultWidePtr[0] = GetNumStringChars() - 1; 132922508f410b3d727d5c557af3304c0a1bad94999eEli Friedman } else if (CharByteWidth == 2) { 133022508f410b3d727d5c557af3304c0a1bad94999eEli Friedman // FIXME: Make the type of the result buffer correct instead of 133122508f410b3d727d5c557af3304c0a1bad94999eEli Friedman // using reinterpret_cast. 133222508f410b3d727d5c557af3304c0a1bad94999eEli Friedman UTF16 *ResultWidePtr = reinterpret_cast<UTF16*>(ResultBuf.data()); 133322508f410b3d727d5c557af3304c0a1bad94999eEli Friedman ResultWidePtr[0] = GetNumStringChars() - 1; 133422508f410b3d727d5c557af3304c0a1bad94999eEli Friedman } else { 133522508f410b3d727d5c557af3304c0a1bad94999eEli Friedman assert(CharByteWidth == 1 && "Unexpected char width"); 133622508f410b3d727d5c557af3304c0a1bad94999eEli Friedman ResultBuf[0] = GetNumStringChars() - 1; 133722508f410b3d727d5c557af3304c0a1bad94999eEli Friedman } 1338bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner 1339bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner // Verify that pascal strings aren't too large. 13400833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner if (GetStringLength() > 256) { 1341e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith if (Diags) 1342e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diags->Report(StringToks[0].getLocation(), 13430833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner diag::err_pascal_string_too_long) 13440833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner << SourceRange(StringToks[0].getLocation(), 13450833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner StringToks[NumStringToks-1].getLocation()); 13465cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor hadError = true; 134757d7dde770c67b282e7fb77b1b81e429910937b3Eli Friedman return; 134857d7dde770c67b282e7fb77b1b81e429910937b3Eli Friedman } 13490833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner } else if (Diags) { 1350427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor // Complain if this string literal has too many characters. 1351a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner unsigned MaxChars = Features.CPlusPlus? 65536 : Features.C99 ? 4095 : 509; 1352427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor 1353427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor if (GetNumStringChars() > MaxChars) 1354e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diags->Report(StringToks[0].getLocation(), 13550833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner diag::ext_string_too_long) 1356427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor << GetNumStringChars() << MaxChars 1357a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner << (Features.CPlusPlus ? 2 : Features.C99 ? 1 : 0) 1358427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor << SourceRange(StringToks[0].getLocation(), 1359427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor StringToks[NumStringToks-1].getLocation()); 1360bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner } 13615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1362719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1363e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith/// \brief This function copies from Fragment, which is a sequence of bytes 1364e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith/// within Tok's contents (which begin at TokBegin) into ResultPtr. 13652fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// Performs widening for multi-byte characters. 1366e5f0588840b20897631cc8110344fd2745ef4caaRichard Smithbool StringLiteralParser::CopyStringFragment(const Token &Tok, 1367e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith const char *TokBegin, 1368e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith StringRef Fragment) { 1369e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith const UTF8 *ErrorPtrTmp; 1370e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith if (ConvertUTF8toWide(CharByteWidth, Fragment, ResultPtr, ErrorPtrTmp)) 1371e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith return false; 1372e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith const char *ErrorPtr = reinterpret_cast<const char *>(ErrorPtrTmp); 13732fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 137491359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // If we see bad encoding for unprefixed string literals, warn and 137591359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // simply copy the byte values, for compatibility with gcc and older 137691359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // versions of clang. 137791359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman bool NoErrorOnBadEncoding = isAscii(); 1378e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith if (NoErrorOnBadEncoding) { 1379e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith memcpy(ResultPtr, Fragment.data(), Fragment.size()); 1380e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith ResultPtr += Fragment.size(); 1381e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith } 1382e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith if (Diags) { 1383e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Diag(Diags, Features, FullSourceLoc(Tok.getLocation(), SM), TokBegin, 1384e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith ErrorPtr, ErrorPtr + std::min<unsigned>(getNumBytesForUTF8(*ErrorPtr), 1385e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith Fragment.end() - ErrorPtr), 1386e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith NoErrorOnBadEncoding ? diag::warn_bad_string_encoding 1387e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith : diag::err_bad_string_encoding); 1388e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith } 138991359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman return !NoErrorOnBadEncoding; 139091359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman} 13912fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 13923144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidisvoid StringLiteralParser::DiagnoseLexingError(SourceLocation Loc) { 13933144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis hadError = true; 13943144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis if (Diags) 13953144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis Diags->Report(Loc, diag::err_lexing_string); 13963144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis} 13973144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis 1398719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner/// getOffsetOfStringByte - This function returns the offset of the 1399719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner/// specified byte of the string data represented by Token. This handles 1400719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner/// advancing over escape sequences in the string. 1401719e61573f27c11057ecfe0dd8f141621602c571Chris Lattnerunsigned StringLiteralParser::getOffsetOfStringByte(const Token &Tok, 14026c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner unsigned ByteNo) const { 1403719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Get the spelling of the token. 1404f7ccbad5d9949e7ddd1cbef43d482553b811e026Dylan Noblesmith SmallString<32> SpellingBuffer; 14056cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt SpellingBuffer.resize(Tok.getLength()); 14061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 140750f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor bool StringInvalid = false; 1408719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner const char *SpellingPtr = &SpellingBuffer[0]; 1409b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner unsigned TokLen = Lexer::getSpelling(Tok, SpellingPtr, SM, Features, 1410b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner &StringInvalid); 141191f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (StringInvalid) 141250f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor return 0; 1413719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1414df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const char *SpellingStart = SpellingPtr; 1415df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const char *SpellingEnd = SpellingPtr+TokLen; 1416df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 1417df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // Handle UTF-8 strings just like narrow strings. 1418df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (SpellingPtr[0] == 'u' && SpellingPtr[1] == '8') 1419df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith SpellingPtr += 2; 1420df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 14215cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert(SpellingPtr[0] != 'L' && SpellingPtr[0] != 'u' && 14225cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor SpellingPtr[0] != 'U' && "Doesn't handle wide or utf strings yet"); 1423719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1424df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // For raw string literals, this is easy. 1425df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (SpellingPtr[0] == 'R') { 1426df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith assert(SpellingPtr[1] == '"' && "Should be a raw string literal!"); 1427df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // Skip 'R"'. 1428df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith SpellingPtr += 2; 1429df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith while (*SpellingPtr != '(') { 1430df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith ++SpellingPtr; 1431df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith assert(SpellingPtr < SpellingEnd && "Missing ( for raw string literal"); 1432df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 1433df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // Skip '('. 1434df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith ++SpellingPtr; 1435df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return SpellingPtr - SpellingStart + ByteNo; 1436df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 14371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1438df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // Skip over the leading quote 1439719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(SpellingPtr[0] == '"' && "Should be a string literal!"); 1440719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner ++SpellingPtr; 14411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1442719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Skip over bytes until we find the offset we're looking for. 1443719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner while (ByteNo) { 1444719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(SpellingPtr < SpellingEnd && "Didn't find byte offset!"); 14451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1446719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Step over non-escapes simply. 1447719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner if (*SpellingPtr != '\\') { 1448719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner ++SpellingPtr; 1449719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner --ByteNo; 1450719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner continue; 1451719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner } 14521eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1453719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Otherwise, this is an escape character. Advance over it. 1454719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner bool HadError = false; 1455df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (SpellingPtr[1] == 'u' || SpellingPtr[1] == 'U') { 1456df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const char *EscapePtr = SpellingPtr; 1457df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith unsigned Len = MeasureUCNEscape(SpellingStart, SpellingPtr, SpellingEnd, 1458df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 1, Features, HadError); 1459df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (Len > ByteNo) { 1460df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // ByteNo is somewhere within the escape sequence. 1461df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith SpellingPtr = EscapePtr; 1462df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith break; 1463df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 1464df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith ByteNo -= Len; 1465df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } else { 1466e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith ProcessCharEscape(SpellingStart, SpellingPtr, SpellingEnd, HadError, 1467df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith FullSourceLoc(Tok.getLocation(), SM), 1468e5f0588840b20897631cc8110344fd2745ef4caaRichard Smith CharByteWidth*8, Diags, Features); 1469df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith --ByteNo; 1470df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 1471719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(!HadError && "This method isn't valid on erroneous strings"); 1472719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner } 14731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1474719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner return SpellingPtr-SpellingStart; 1475719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner} 1476