LiteralSupport.cpp revision df9ef1bc8c3780307ab2ed81bf5e31c23310b936
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 525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// ProcessCharEscape - Parse a standard C escape sequence, which can occur in 535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// either a character or a string literal. 545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstatic unsigned ProcessCharEscape(const char *&ThisTokBuf, 555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *ThisTokEnd, bool &HadError, 565cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor FullSourceLoc Loc, unsigned CharWidth, 57d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie DiagnosticsEngine *Diags) { 585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Skip the '\' char. 595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // We know that this character can't be off the end of the buffer, because 625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // that would have been \", which would not have been the end of string. 635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned ResultChar = *ThisTokBuf++; 645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (ResultChar) { 655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // These map to themselves. 665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '\\': case '\'': case '"': case '?': break; 671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // These have fixed mappings. 695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'a': 705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // TODO: K&R: the meaning of '\\a' is different in traditional C 715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 7; 725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'b': 745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 8; 755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'e': 7791f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 7891f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_nonstandard_escape) << "e"; 795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 27; 805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 813c54801fbc67d8df2fed0711a2e2022db6b1bbcfEli Friedman case 'E': 8291f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 8391f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_nonstandard_escape) << "E"; 843c54801fbc67d8df2fed0711a2e2022db6b1bbcfEli Friedman ResultChar = 27; 853c54801fbc67d8df2fed0711a2e2022db6b1bbcfEli Friedman break; 865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'f': 875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 12; 885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'n': 905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 10; 915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'r': 935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 13; 945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 't': 965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 9; 975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'v': 995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 11; 1005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'x': { // Hex escape. 1025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 0; 1035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ThisTokBuf == ThisTokEnd || !isxdigit(*ThisTokBuf)) { 10491f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 10591f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::err_hex_escape_no_digits); 1065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer HadError = 1; 1075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Hex escapes are a maximal series of hex digits. 1115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool Overflow = false; 1125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (; ThisTokBuf != ThisTokEnd; ++ThisTokBuf) { 1135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer int CharVal = HexDigitValue(ThisTokBuf[0]); 1145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CharVal == -1) break; 115c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // About to shift out a digit? 116c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner Overflow |= (ResultChar & 0xF0000000) ? true : false; 1175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar <<= 4; 1185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar |= CharVal; 1195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // See if any bits will be truncated when evaluated as a character. 1225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) { 1235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Overflow = true; 1245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar &= ~0U >> (32-CharWidth); 1255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Check for overflow. 12891f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Overflow && Diags) // Too many digits to fit in 12991f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::warn_hex_escape_too_large); 1305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '0': case '1': case '2': case '3': 1335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '4': case '5': case '6': case '7': { 1345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Octal escapes. 1355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer --ThisTokBuf; 1365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 0; 1375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Octal escapes are a series of octal digits with maximum length 3. 1395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // "\0123" is a two digit sequence equal to "\012" "3". 1405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned NumDigits = 0; 1415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer do { 1425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar <<= 3; 1435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar |= *ThisTokBuf++ - '0'; 1445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++NumDigits; 1455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } while (ThisTokBuf != ThisTokEnd && NumDigits < 3 && 1465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ThisTokBuf[0] >= '0' && ThisTokBuf[0] <= '7'); 1471eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Check for overflow. Reject '\777', but not L'\777'. 1495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) { 15091f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 15191f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::warn_octal_escape_too_large); 1525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar &= ~0U >> (32-CharWidth); 1535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, these are not valid escapes. 1585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '(': case '{': case '[': case '%': 1595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // GCC accepts these as extensions. We warn about them as such though. 16091f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 16191f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_nonstandard_escape) 162b90f4b3fb94056609da9cca5eef7358d95a363b2Douglas Gregor << std::string()+(char)ResultChar; 163f01fdff97b245caac98100d232c760b4d0531411Eli Friedman break; 1645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer default: 16591f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags == 0) 166b90f4b3fb94056609da9cca5eef7358d95a363b2Douglas Gregor break; 167b90f4b3fb94056609da9cca5eef7358d95a363b2Douglas Gregor 16823ef69d197ba3b5e9602f7161fee50990059502aTed Kremenek if (isgraph(ResultChar)) 16991f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_unknown_escape) 17091f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner << std::string()+(char)ResultChar; 171ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner else 17291f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_unknown_escape) 17391f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner << "x"+llvm::utohexstr(ResultChar); 1745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return ResultChar; 1785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1800e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff/// ProcessUCNEscape - Read the Universal Character Name, check constraints and 18159705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// return the UTF32. 18226b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smithstatic bool ProcessUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf, 18326b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *ThisTokEnd, 18459705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber uint32_t &UcnVal, unsigned short &UcnLen, 185d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie FullSourceLoc Loc, DiagnosticsEngine *Diags, 186be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell const LangOptions &Features, 187be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell bool in_char_string_literal = false) { 1886c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner if (!Features.CPlusPlus && !Features.C99 && Diags) 189872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner Diags->Report(Loc, diag::warn_ucn_not_valid_in_c89); 1901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 19126b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *UcnBegin = ThisTokBuf; 1921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1930e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Skip the '\u' char's. 1940e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff ThisTokBuf += 2; 1950e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff 1960e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (ThisTokBuf == ThisTokEnd || !isxdigit(*ThisTokBuf)) { 1976c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner if (Diags) 198872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner Diags->Report(Loc, diag::err_ucn_escape_no_digits); 19959705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return false; 2000e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 20159705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber UcnLen = (ThisTokBuf[-1] == 'u' ? 4 : 8); 20256bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian unsigned short UcnLenSave = UcnLen; 20359705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber for (; ThisTokBuf != ThisTokEnd && UcnLenSave; ++ThisTokBuf, UcnLenSave--) { 2040e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff int CharVal = HexDigitValue(ThisTokBuf[0]); 2050e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (CharVal == -1) break; 2060e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff UcnVal <<= 4; 2070e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff UcnVal |= CharVal; 2080e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 2090e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // If we didn't consume the proper number of digits, there is a problem. 21059705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber if (UcnLenSave) { 211872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner if (Diags) { 2127ef5c27eb6e8ebe58b52013246c06753c3613263Chris Lattner SourceLocation L = 21326b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith Lexer::AdvanceToTokenCharacter(Loc, UcnBegin - ThisTokBegin, 2147ef5c27eb6e8ebe58b52013246c06753c3613263Chris Lattner Loc.getManager(), Features); 21526b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith Diags->Report(L, diag::err_ucn_escape_incomplete); 216872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner } 21759705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return false; 2180e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 21926b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith 220be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Check UCN constraints (C99 6.4.3p2) [C++11 lex.charset p2] 22126b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if ((0xD800 <= UcnVal && UcnVal <= 0xDFFF) || // surrogate codepoints 22226b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith UcnVal > 0x10FFFF) { // maximum legal UTF32 value 22326b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (Diags) 22426b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith Diags->Report(Loc, diag::err_ucn_escape_invalid); 22526b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith return false; 22626b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith } 227be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 228be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // C++11 allows UCNs that refer to control characters and basic source 229be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // characters inside character and string literals 23026b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (UcnVal < 0xa0 && 23126b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith (UcnVal != 0x24 && UcnVal != 0x40 && UcnVal != 0x60)) { // $, @, ` 23226b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith bool IsError = (!Features.CPlusPlus0x || !in_char_string_literal); 23326b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (Diags) { 23426b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith SourceLocation UcnBeginLoc = 23526b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith Lexer::AdvanceToTokenCharacter(Loc, UcnBegin - ThisTokBegin, 23626b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith Loc.getManager(), Features); 23726b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith char BasicSCSChar = UcnVal; 23826b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (UcnVal >= 0x20 && UcnVal < 0x7f) 23926b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith Diags->Report(UcnBeginLoc, IsError ? diag::err_ucn_escape_basic_scs : 24026b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith diag::warn_cxx98_compat_literal_ucn_escape_basic_scs) 24126b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith << StringRef(&BasicSCSChar, 1); 24226b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith else 24326b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith Diags->Report(UcnBeginLoc, IsError ? diag::err_ucn_control_character : 24426b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith diag::warn_cxx98_compat_literal_ucn_control_character); 245be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 24626b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (IsError) 24726b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith return false; 248be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 249be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 25059705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return true; 25159705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber} 25259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber 253df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith/// MeasureUCNEscape - Determine the number of bytes within the resulting string 254df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith/// which this UCN will occupy. 255df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smithstatic int MeasureUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf, 256df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const char *ThisTokEnd, unsigned CharByteWidth, 257df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const LangOptions &Features, bool &HadError) { 258df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // UTF-32: 4 bytes per escape. 259df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (CharByteWidth == 4) 260df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 4; 261df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 262df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith uint32_t UcnVal = 0; 263df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith unsigned short UcnLen = 0; 264df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith FullSourceLoc Loc; 265df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 266df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (!ProcessUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, UcnVal, 267df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith UcnLen, Loc, 0, Features, true)) { 268df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith HadError = true; 269df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 0; 270df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 271df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 272df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // UTF-16: 2 bytes for BMP, 4 bytes otherwise. 273df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (CharByteWidth == 2) 274df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return UcnVal <= 0xFFFF ? 2 : 4; 275df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 276df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // UTF-8. 277df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (UcnVal < 0x80) 278df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 1; 279df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (UcnVal < 0x800) 280df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 2; 281df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (UcnVal < 0x10000) 282df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 3; 283df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return 4; 284df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith} 285df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 28659705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// EncodeUCNEscape - Read the Universal Character Name, check constraints and 28759705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// convert the UTF32 to UTF8 or UTF16. This is a subroutine of 28859705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// StringLiteralParser. When we decide to implement UCN's for identifiers, 28959705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// we will likely rework our support for UCN's. 29026b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smithstatic void EncodeUCNEscape(const char *ThisTokBegin, const char *&ThisTokBuf, 29126b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *ThisTokEnd, 292a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner char *&ResultBuf, bool &HadError, 2935cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor FullSourceLoc Loc, unsigned CharByteWidth, 294d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie DiagnosticsEngine *Diags, 295d6471f7c1921c7802804ce3ff6fe9768310f72b9David Blaikie const LangOptions &Features) { 29659705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber typedef uint32_t UTF32; 29759705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber UTF32 UcnVal = 0; 29859705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber unsigned short UcnLen = 0; 29926b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (!ProcessUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, UcnVal, UcnLen, 30026b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith Loc, Diags, Features, true)) { 301df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith HadError = true; 3020e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff return; 3030e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 30459705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber 3055cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert((CharByteWidth == 1 || CharByteWidth == 2 || CharByteWidth) && 3065cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor "only character widths of 1, 2, or 4 bytes supported"); 307a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber 3085cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor (void)UcnLen; 3095cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert((UcnLen== 4 || UcnLen== 8) && "only ucn length of 4 or 8 supported"); 3105cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor 3115cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (CharByteWidth == 4) { 312caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // FIXME: Make the type of the result buffer correct instead of 313caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // using reinterpret_cast. 314caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman UTF32 *ResultPtr = reinterpret_cast<UTF32*>(ResultBuf); 315caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *ResultPtr = UcnVal; 316caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultBuf += 4; 3175cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor return; 3185cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } 319a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber 3205cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (CharByteWidth == 2) { 321caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // FIXME: Make the type of the result buffer correct instead of 322caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // using reinterpret_cast. 323caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman UTF16 *ResultPtr = reinterpret_cast<UTF16*>(ResultBuf); 324caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman 325a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber if (UcnVal < (UTF32)0xFFFF) { 326caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *ResultPtr = UcnVal; 327caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultBuf += 2; 328a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber return; 329a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber } 330a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber 331caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // Convert to UTF16. 332a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber UcnVal -= 0x10000; 333caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *ResultPtr = 0xD800 + (UcnVal >> 10); 334caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *(ResultPtr+1) = 0xDC00 + (UcnVal & 0x3FF); 335caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultBuf += 4; 33656bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian return; 33756bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian } 3385cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor 3395cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert(CharByteWidth == 1 && "UTF-8 encoding is only for 1 byte characters"); 3405cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor 3410e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Now that we've parsed/checked the UCN, we convert from UTF32->UTF8. 3420e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // The conversion below was inspired by: 3430e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // http://www.unicode.org/Public/PROGRAMS/CVTUTF/ConvertUTF.c 3441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // First, we determine how many bytes the result will require. 3454e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff typedef uint8_t UTF8; 3460e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff 3470e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff unsigned short bytesToWrite = 0; 3480e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (UcnVal < (UTF32)0x80) 3490e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 1; 3500e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff else if (UcnVal < (UTF32)0x800) 3510e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 2; 3520e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff else if (UcnVal < (UTF32)0x10000) 3530e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 3; 3540e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff else 3550e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 4; 3561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3570e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff const unsigned byteMask = 0xBF; 3580e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff const unsigned byteMark = 0x80; 3591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3600e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Once the bits are split out into bytes of UTF8, this is a mask OR-ed 3618a5c0cd90b8d607ca284274000ed8716b836d253Steve Naroff // into the first byte, depending on how many bytes follow. 3621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump static const UTF8 firstByteMark[5] = { 3638a5c0cd90b8d607ca284274000ed8716b836d253Steve Naroff 0x00, 0x00, 0xC0, 0xE0, 0xF0 3640e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff }; 3650e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Finally, we write the bytes into ResultBuf. 3660e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff ResultBuf += bytesToWrite; 3670e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff switch (bytesToWrite) { // note: everything falls through. 3680e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 4: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; 3690e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 3: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; 3700e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 2: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; 3710e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 1: *--ResultBuf = (UTF8) (UcnVal | firstByteMark[bytesToWrite]); 3720e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 3730e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Update the buffer. 3740e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff ResultBuf += bytesToWrite; 3750e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff} 3765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// integer-constant: [C99 6.4.4.1] 3795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// decimal-constant integer-suffix 3805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-constant integer-suffix 3815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-constant integer-suffix 38249d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith/// user-defined-integer-literal: [C++11 lex.ext] 383b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith/// decimal-literal ud-suffix 384b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith/// octal-literal ud-suffix 385b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith/// hexadecimal-literal ud-suffix 3861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// decimal-constant: 3875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// nonzero-digit 3885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// decimal-constant digit 3891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// octal-constant: 3905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0 3915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-constant octal-digit 3921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// hexadecimal-constant: 3935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-prefix hexadecimal-digit 3945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-constant hexadecimal-digit 3955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-prefix: one of 3965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0x 0X 3975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// integer-suffix: 3985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// unsigned-suffix [long-suffix] 3995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// unsigned-suffix [long-long-suffix] 4005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// long-suffix [unsigned-suffix] 4015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// long-long-suffix [unsigned-sufix] 4025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// nonzero-digit: 4035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 1 2 3 4 5 6 7 8 9 4045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-digit: 4055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0 1 2 3 4 5 6 7 4065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-digit: 4075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0 1 2 3 4 5 6 7 8 9 4085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// a b c d e f 4095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// A B C D E F 4105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// unsigned-suffix: one of 4115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// u U 4125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// long-suffix: one of 4135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// l L 4141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// long-long-suffix: one of 4155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// ll LL 4165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 4175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// floating-constant: [C99 6.4.4.2] 4185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// TODO: add rules... 4195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 4205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerNumericLiteralParser:: 4215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerNumericLiteralParser(const char *begin, const char *end, 4225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SourceLocation TokLoc, Preprocessor &pp) 4235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer : PP(pp), ThisTokBegin(begin), ThisTokEnd(end) { 4241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 425c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // This routine assumes that the range begin/end matches the regex for integer 426c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // and FP constants (specifically, the 'pp-number' regex), and assumes that 427c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // the byte at "*end" is both valid and not part of the regex. Because of 428c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // this, it doesn't have to check for 'overscan' in various places. 429c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner assert(!isalnum(*end) && *end != '.' && *end != '_' && 430c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner "Lexer didn't maximally munch?"); 4311eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = DigitsBegin = begin; 4335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_exponent = false; 4345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_period = false; 435b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith saw_ud_suffix = false; 4365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isLong = false; 4375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isUnsigned = false; 4385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isLongLong = false; 4396e400c286b485e28d04a742ea87860ddfefa672eChris Lattner isFloat = false; 440506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isImaginary = false; 441b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump isMicrosoftInteger = false; 4425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer hadError = false; 4431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 4445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (*s == '0') { // parse radix 445368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner ParseNumberStartingWithZero(TokLoc); 446368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (hadError) 447368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 4485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { // the first digit is non-zero 4495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer radix = 10; 4505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = SkipDigits(s); 4515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (s == ThisTokEnd) { 4525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Done. 453016765e3453db2e302efe53905e99cdb25501234Christopher Lamb } else if (isxdigit(*s) && !(*s == 'e' || *s == 'E')) { 454ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-begin), 4555f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner diag::err_invalid_decimal_digit) << StringRef(s, 1); 456ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 4575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return; 4585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else if (*s == '.') { 4595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s++; 4605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_period = true; 4615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = SkipDigits(s); 4621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 4634411f46050216a139ab2fc7ff145ec384d11ec7fChris Lattner if ((*s == 'e' || *s == 'E')) { // exponent 46470f66ab053f36ab3df7a778d09bcb2b4b0fec1f8Chris Lattner const char *Exponent = s; 4655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s++; 4665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_exponent = true; 4675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (*s == '+' || *s == '-') s++; // sign 4685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *first_non_digit = SkipDigits(s); 4690b7f69d789ca1f76582ee9a336e25861fd0c1416Chris Lattner if (first_non_digit != s) { 4705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = first_non_digit; 4710b7f69d789ca1f76582ee9a336e25861fd0c1416Chris Lattner } else { 472ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-begin), 473ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_exponent_has_no_digits); 474ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 4750b7f69d789ca1f76582ee9a336e25861fd0c1416Chris Lattner return; 4765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 4795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 4805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SuffixBegin = s; 4811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 482506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Parse the suffix. At this point we can classify whether we have an FP or 483506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // integer constant. 484506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner bool isFPConstant = isFloatingLiteral(); 4851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 486506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Loop over all of the characters of the suffix. If we see something bad, 487506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // we break out of the loop. 488506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner for (; s != ThisTokEnd; ++s) { 489506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner switch (*s) { 490506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'f': // FP Suffix for "float" 491506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'F': 492506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (!isFPConstant) break; // Error for integer constant. 4936e400c286b485e28d04a742ea87860ddfefa672eChris Lattner if (isFloat || isLong) break; // FF, LF invalid. 4946e400c286b485e28d04a742ea87860ddfefa672eChris Lattner isFloat = true; 495506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 496506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'u': 497506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'U': 498506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isFPConstant) break; // Error for floating constant. 499506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isUnsigned) break; // Cannot be repeated. 500506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isUnsigned = true; 501506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 502506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'l': 503506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'L': 504506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isLong || isLongLong) break; // Cannot be repeated. 5056e400c286b485e28d04a742ea87860ddfefa672eChris Lattner if (isFloat) break; // LF invalid. 5061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 507506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Check for long long. The L's need to be adjacent and the same case. 508506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (s+1 != ThisTokEnd && s[1] == s[0]) { 509506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isFPConstant) break; // long long invalid for floats. 510506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isLongLong = true; 511506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner ++s; // Eat both of them. 512506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner } else { 5135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isLong = true; 5145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 515506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 516506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'i': 517c637415a96c16abc7e28ef83c6c105716f7e8936Chris Lattner case 'I': 5184e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (PP.getLangOpts().MicrosoftExt) { 519a8be02b655b76e4dbe776b0c62bc3c450dc6feabFariborz Jahanian if (isFPConstant || isLong || isLongLong) break; 5206e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes 5210c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff // Allow i8, i16, i32, i64, and i128. 522b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump if (s + 1 != ThisTokEnd) { 523b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump switch (s[1]) { 524b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '8': 525b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump s += 2; // i8 suffix 526b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump isMicrosoftInteger = true; 5276e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 528b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '1': 5296e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 2 == ThisTokEnd) break; 530d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[2] == '6') { 531d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 3; // i16 suffix 532d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 533d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 5346e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes else if (s[2] == '2') { 5356e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 3 == ThisTokEnd) break; 536d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[3] == '8') { 537d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 4; // i128 suffix 538d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 539d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 540b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump } 5416e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 542b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '3': 5436e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 2 == ThisTokEnd) break; 544d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[2] == '2') { 545d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 3; // i32 suffix 546d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isLong = true; 547d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 548d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 5496e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 550b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '6': 5516e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 2 == ThisTokEnd) break; 552d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[2] == '4') { 553d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 3; // i64 suffix 554d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isLongLong = true; 555d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 556d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 5576e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 558b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump default: 559b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump break; 560b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump } 561b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump break; 5620c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff } 5630c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff } 5640c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff // fall through. 565506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'j': 566506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'J': 567506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isImaginary) break; // Cannot be repeated. 568506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-begin), 569506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner diag::ext_imaginary_constant); 570506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isImaginary = true; 571506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 5725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 573b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith // If we reached here, there was an error or a ud-suffix. 574506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner break; 575506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner } 5761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 577506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (s != ThisTokEnd) { 5784e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (PP.getLangOpts().CPlusPlus0x && s == SuffixBegin && *s == '_') { 579b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith // We have a ud-suffix! By C++11 [lex.ext]p10, ud-suffixes not starting 580b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith // with an '_' are ill-formed. 581b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith saw_ud_suffix = true; 582b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith return; 583b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith } 584b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith 585b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith // Report an error if there are any. 586b453ad3214d00acc51c9aa702c76c58354d84b84Richard Smith PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, SuffixBegin-begin), 587ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner isFPConstant ? diag::err_invalid_suffix_float_constant : 588ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_invalid_suffix_integer_constant) 5895f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner << StringRef(SuffixBegin, ThisTokEnd-SuffixBegin); 590ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 591506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner return; 5925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 595368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// ParseNumberStartingWithZero - This method is called when the first character 596368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// of the number is found to be a zero. This means it is either an octal 597368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// number (like '04') or a hex number ('0x123a') a binary number ('0b1010') or 5981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// a floating point number (01239.123e4). Eat the prefix, determining the 599368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// radix etc. 600368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattnervoid NumericLiteralParser::ParseNumberStartingWithZero(SourceLocation TokLoc) { 601368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner assert(s[0] == '0' && "Invalid method call"); 602368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 6031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 604368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Handle a hex number like 0x1234. 605368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if ((*s == 'x' || *s == 'X') && (isxdigit(s[1]) || s[1] == '.')) { 606368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 607368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 16; 608368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner DigitsBegin = s; 609368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipHexDigits(s); 61066b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman bool noSignificand = (s == DigitsBegin); 611368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (s == ThisTokEnd) { 612368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Done. 613368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else if (*s == '.') { 614368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 615368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_period = true; 61666b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman const char *floatDigitsBegin = s; 617368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipHexDigits(s); 61866b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman noSignificand &= (floatDigitsBegin == s); 61966b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman } 62066b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman 62166b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman if (noSignificand) { 62266b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), \ 62366b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman diag::err_hexconstant_requires_digits); 62466b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman hadError = true; 62566b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman return; 626368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 62766b0ebac276353f3ff7d41eaba3e6d24d48663b7Aaron Ballman 628368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // A binary exponent can appear with or with a '.'. If dotted, the 6291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // binary exponent is required. 6301155c42e7b1b4e401bb0a331a6d715d637958c75Douglas Gregor if (*s == 'p' || *s == 'P') { 631368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *Exponent = s; 632368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 633368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_exponent = true; 634368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == '+' || *s == '-') s++; // sign 635368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *first_non_digit = SkipDigits(s); 6366ea623823f8532670480425b573f35115404b4a0Chris Lattner if (first_non_digit == s) { 637ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-ThisTokBegin), 638ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_exponent_has_no_digits); 639ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 6406ea623823f8532670480425b573f35115404b4a0Chris Lattner return; 641368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 6426ea623823f8532670480425b573f35115404b4a0Chris Lattner s = first_non_digit; 6431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6444e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie if (!PP.getLangOpts().HexFloats) 645ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(TokLoc, diag::ext_hexconstant_invalid); 646368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else if (saw_period) { 647ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), 648ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_hexconstant_requires_exponent); 649ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 650368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 651368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 652368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 6531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 654368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Handle simple binary numbers 0b01010 655368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == 'b' || *s == 'B') { 656368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // 0b101010 is a GCC extension. 657413d355e38755a71f106dbc0ac900ca989070916Chris Lattner PP.Diag(TokLoc, diag::ext_binary_literal); 658368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner ++s; 659368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 2; 660368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner DigitsBegin = s; 661368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipBinaryDigits(s); 662368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (s == ThisTokEnd) { 663368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Done. 664368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else if (isxdigit(*s)) { 665ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), 6665f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner diag::err_invalid_binary_digit) << StringRef(s, 1); 667ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 668368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 669413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // Other suffixes will be diagnosed by the caller. 670368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 671368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 6721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 673368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // For now, the radix is set to 8. If we discover that we have a 674368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // floating point constant, the radix will change to 10. Octal floating 6751eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // point constants are not permitted (only decimal and hexadecimal). 676368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 8; 677368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner DigitsBegin = s; 678368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipOctalDigits(s); 679368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (s == ThisTokEnd) 680368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; // Done, simple octal number like 01234 6811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 682413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // If we have some other non-octal digit that *is* a decimal digit, see if 683413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // this is part of a floating point number like 094.123 or 09e1. 684413d355e38755a71f106dbc0ac900ca989070916Chris Lattner if (isdigit(*s)) { 685413d355e38755a71f106dbc0ac900ca989070916Chris Lattner const char *EndDecimal = SkipDigits(s); 686413d355e38755a71f106dbc0ac900ca989070916Chris Lattner if (EndDecimal[0] == '.' || EndDecimal[0] == 'e' || EndDecimal[0] == 'E') { 687413d355e38755a71f106dbc0ac900ca989070916Chris Lattner s = EndDecimal; 688413d355e38755a71f106dbc0ac900ca989070916Chris Lattner radix = 10; 689413d355e38755a71f106dbc0ac900ca989070916Chris Lattner } 690413d355e38755a71f106dbc0ac900ca989070916Chris Lattner } 6911eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 692413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // If we have a hex digit other than 'e' (which denotes a FP exponent) then 693413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // the code is using an incorrect base. 694368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (isxdigit(*s) && *s != 'e' && *s != 'E') { 695ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), 6965f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner diag::err_invalid_octal_digit) << StringRef(s, 1); 697ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 698368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 699368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 7001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 701368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == '.') { 702368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 703368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 10; 704368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_period = true; 705413d355e38755a71f106dbc0ac900ca989070916Chris Lattner s = SkipDigits(s); // Skip suffix. 706368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 707368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == 'e' || *s == 'E') { // exponent 708368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *Exponent = s; 709368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 710368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 10; 711368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_exponent = true; 712368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == '+' || *s == '-') s++; // sign 713368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *first_non_digit = SkipDigits(s); 714368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (first_non_digit != s) { 715368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = first_non_digit; 716368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else { 7171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-ThisTokBegin), 718ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_exponent_has_no_digits); 719ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 720368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 721368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 722368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 723368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner} 724368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner 725368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner 7265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// GetIntegerValue - Convert this numeric literal value to an APInt that 7275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// matches Val's input width. If there is an overflow, set Val to the low bits 7285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// of the result and return true. Otherwise, return false. 7295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerbool NumericLiteralParser::GetIntegerValue(llvm::APInt &Val) { 730a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // Fast path: Compute a conservative bound on the maximum number of 731a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // bits per digit in this radix. If we can't possibly overflow a 732a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // uint64 based on that bound then do the simple conversion to 733a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // integer. This avoids the expensive overflow checking below, and 734a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // handles the common cases that matter (small decimal integers and 735a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // hex/octal values which don't overflow). 736a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar unsigned MaxBitsPerDigit = 1; 7371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump while ((1U << MaxBitsPerDigit) < radix) 738a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar MaxBitsPerDigit += 1; 739a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar if ((SuffixBegin - DigitsBegin) * MaxBitsPerDigit <= 64) { 740a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar uint64_t N = 0; 741a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar for (s = DigitsBegin; s != SuffixBegin; ++s) 742a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar N = N*radix + HexDigitValue(*s); 743a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar 744a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // This will truncate the value to Val's input width. Simply check 745a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // for overflow by comparing. 746a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar Val = N; 747a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar return Val.getZExtValue() != N; 748a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar } 749a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar 7505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val = 0; 7515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = DigitsBegin; 7525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APInt RadixVal(Val.getBitWidth(), radix); 7545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APInt CharVal(Val.getBitWidth(), 0); 7555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APInt OldVal = Val; 7561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool OverflowOccurred = false; 7585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer while (s < SuffixBegin) { 7595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned C = HexDigitValue(*s++); 7601eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this letter is out of bound for this radix, reject it. 7625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(C < radix && "NumericLiteralParser ctor should have rejected this"); 7631eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer CharVal = C; 7651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Add the digit to the value in the appropriate radix. If adding in digits 7675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // made the value smaller, then this overflowed. 7685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer OldVal = Val; 7695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Multiply by radix, did overflow occur on the multiply? 7715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val *= RadixVal; 7725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer OverflowOccurred |= Val.udiv(RadixVal) != OldVal; 7735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Add value, did overflow occur on the value? 775d70cb645702bdbb42aee58403306a7c47e0d901cDaniel Dunbar // (a + b) ult b <=> overflow 7765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val += CharVal; 7775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer OverflowOccurred |= Val.ult(CharVal); 7785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return OverflowOccurred; 7805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 78294c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCallllvm::APFloat::opStatus 78394c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCallNumericLiteralParser::GetFloatValue(llvm::APFloat &Result) { 784427d5af5b601985093b6b4b33ba1e30fc24d86dcTed Kremenek using llvm::APFloat; 7851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 786e9f195f15ffe96d0a220c872ab12d0630a633c44Erick Tryzelaar unsigned n = std::min(SuffixBegin - ThisTokBegin, ThisTokEnd - ThisTokBegin); 78794c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCall return Result.convertFromString(StringRef(ThisTokBegin, n), 78894c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCall APFloat::rmNearestTiesToEven); 7895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 7905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7925cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// user-defined-character-literal: [C++11 lex.ext] 7935cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// character-literal ud-suffix 7945cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// ud-suffix: 7955cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// identifier 7965cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// character-literal: [C++11 lex.ccon] 7972fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// ' c-char-sequence ' 7982fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// u' c-char-sequence ' 7992fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// U' c-char-sequence ' 8002fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// L' c-char-sequence ' 8012fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// c-char-sequence: 8022fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// c-char 8032fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// c-char-sequence c-char 8042fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// c-char: 8052fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// any member of the source character set except the single-quote ', 8062fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// backslash \, or new-line character 8072fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// escape-sequence 8082fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// universal-character-name 8095cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// escape-sequence: 8102fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// simple-escape-sequence 8112fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// octal-escape-sequence 8122fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence 8132fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// simple-escape-sequence: 814ddddd48da72bc29d1c3f388ed91ea5549328129eNAKAMURA Takumi/// one of \' \" \? \\ \a \b \f \n \r \t \v 8152fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// octal-escape-sequence: 8162fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit 8172fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit octal-digit 8182fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit octal-digit octal-digit 8192fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence: 8202fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \x hexadecimal-digit 8212fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence hexadecimal-digit 8225cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith/// universal-character-name: [C++11 lex.charset] 8232fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \u hex-quad 8242fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \U hex-quad hex-quad 8252fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hex-quad: 8262fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hex-digit hex-digit hex-digit hex-digit 8272fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// 8285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerCharLiteralParser::CharLiteralParser(const char *begin, const char *end, 8295cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor SourceLocation Loc, Preprocessor &PP, 8305cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor tok::TokenKind kind) { 831be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // At this point we know that the character matches the regex "(L|u|U)?'.*'". 8325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer HadError = false; 8331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8345cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Kind = kind; 8355cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor 83626b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *TokBegin = begin; 83726b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith 838be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Skip over wide character determinant. 839be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (Kind != tok::char_constant) { 8405cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor ++begin; 8415cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } 8421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Skip over the entry quote. 8445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(begin[0] == '\'' && "Invalid token lexed"); 8455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++begin; 8465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8475cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // Remove an optional ud-suffix. 8485cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith if (end[-1] != '\'') { 8495cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith const char *UDSuffixEnd = end; 8505cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith do { 8515cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith --end; 8525cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } while (end[-1] != '\''); 8535cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith UDSuffixBuf.assign(end, UDSuffixEnd); 85426b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith UDSuffixOffset = end - TokBegin; 8555cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } 8565cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 857be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Trim the ending quote. 8585cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith assert(end != begin && "Invalid token lexed"); 859be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell --end; 860be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 8611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // FIXME: The "Value" is an uint64_t so we can handle char literals of 862fc8f0e14ad142ed811e90fbd9a30e419e301c717Chris Lattner // up to 64-bits. 8635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // FIXME: This extensively assumes that 'char' is 8-bits. 86498be4943e8dc4f3905629a7102668960873cf863Chris Lattner assert(PP.getTargetInfo().getCharWidth() == 8 && 8655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer "Assumes char is 8 bits"); 866e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner assert(PP.getTargetInfo().getIntWidth() <= 64 && 867e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner (PP.getTargetInfo().getIntWidth() & 7) == 0 && 868e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner "Assumes sizeof(int) on target is <= 64 and a multiple of char"); 869e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner assert(PP.getTargetInfo().getWCharWidth() <= 64 && 870e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner "Assumes sizeof(wchar) on target is <= 64"); 8714bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta 872be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell SmallVector<uint32_t,4> codepoint_buffer; 873be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell codepoint_buffer.resize(end-begin); 874be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell uint32_t *buffer_begin = &codepoint_buffer.front(); 875be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell uint32_t *buffer_end = buffer_begin + codepoint_buffer.size(); 876be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 877be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Unicode escapes representing characters that cannot be correctly 878be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // represented in a single code unit are disallowed in character literals 879be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // by this implementation. 880be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell uint32_t largest_character_for_kind; 881be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (tok::wide_char_constant == Kind) { 882be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell largest_character_for_kind = 0xFFFFFFFFu >> (32-PP.getTargetInfo().getWCharWidth()); 883be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else if (tok::utf16_char_constant == Kind) { 884be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell largest_character_for_kind = 0xFFFF; 885be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else if (tok::utf32_char_constant == Kind) { 886be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell largest_character_for_kind = 0x10FFFF; 887be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else { 888be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell largest_character_for_kind = 0x7Fu; 889be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 8905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 891be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell while (begin!=end) { 892be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Is this a span of non-escape characters? 893be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (begin[0] != '\\') { 894be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell char const *start = begin; 895be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell do { 896be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell ++begin; 897be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } while (begin != end && *begin != '\\'); 898be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 89991359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman char const *tmp_in_start = start; 90091359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman uint32_t *tmp_out_start = buffer_begin; 901be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell ConversionResult res = 902be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell ConvertUTF8toUTF32(reinterpret_cast<UTF8 const **>(&start), 903be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell reinterpret_cast<UTF8 const *>(begin), 904be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell &buffer_begin,buffer_end,strictConversion); 905be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (res!=conversionOK) { 90691359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // If we see bad encoding for unprefixed character literals, warn and 90791359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // simply copy the byte values, for compatibility with gcc and 90891359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // older versions of clang. 90991359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman bool NoErrorOnBadEncoding = isAscii(); 91091359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman unsigned Msg = diag::err_bad_character_encoding; 91191359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman if (NoErrorOnBadEncoding) 91291359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman Msg = diag::warn_bad_character_encoding; 91391359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman PP.Diag(Loc, Msg); 91491359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman if (NoErrorOnBadEncoding) { 91591359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman start = tmp_in_start; 91691359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman buffer_begin = tmp_out_start; 91791359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman for ( ; start != begin; ++start, ++buffer_begin) 91891359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman *buffer_begin = static_cast<uint8_t>(*start); 91991359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman } else { 92091359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman HadError = true; 92191359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman } 9225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 92391359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman for (; tmp_out_start <buffer_begin; ++tmp_out_start) { 92491359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman if (*tmp_out_start > largest_character_for_kind) { 925be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell HadError = true; 926be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell PP.Diag(Loc, diag::err_character_too_large); 927be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 9281c6c64b5181a960c7d4cace4995a938d4dfa6fbfChris Lattner } 9295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 930be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 931be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell continue; 9325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 933be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Is this a Universal Character Name excape? 934be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (begin[1] == 'u' || begin[1] == 'U') { 935be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell unsigned short UcnLen = 0; 93626b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith if (!ProcessUCNEscape(TokBegin, begin, end, *buffer_begin, UcnLen, 937be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell FullSourceLoc(Loc, PP.getSourceManager()), 9384e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie &PP.getDiagnostics(), PP.getLangOpts(), 939be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell true)) 940be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell { 941be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell HadError = true; 942be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else if (*buffer_begin > largest_character_for_kind) { 943be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell HadError = true; 944be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell PP.Diag(Loc,diag::err_character_too_large); 945be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 9461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 947be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell ++buffer_begin; 948be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell continue; 949be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 950be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell unsigned CharWidth = getCharWidth(Kind, PP.getTargetInfo()); 951be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell uint64_t result = 952be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell ProcessCharEscape(begin, end, HadError, 953be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell FullSourceLoc(Loc,PP.getSourceManager()), 954be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell CharWidth, &PP.getDiagnostics()); 955be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell *buffer_begin++ = result; 956e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner } 957e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner 958be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell unsigned NumCharsSoFar = buffer_begin-&codepoint_buffer.front(); 959be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 960e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner if (NumCharsSoFar > 1) { 961be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (isWide()) 9625cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor PP.Diag(Loc, diag::warn_extraneous_char_constant); 963be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell else if (isAscii() && NumCharsSoFar == 4) 964be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell PP.Diag(Loc, diag::ext_four_char_character_literal); 965be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell else if (isAscii()) 966e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner PP.Diag(Loc, diag::ext_multichar_character_literal); 967e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner else 968be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell PP.Diag(Loc, diag::err_multichar_utf_character_literal); 9692a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman IsMultiChar = true; 970930b71a4a7dedf70a73e5fd875bae7df452b80a9Daniel Dunbar } else 971930b71a4a7dedf70a73e5fd875bae7df452b80a9Daniel Dunbar IsMultiChar = false; 9724bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta 973be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell llvm::APInt LitVal(PP.getTargetInfo().getIntWidth(), 0); 974be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 975be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // Narrow character literals act as though their value is concatenated 976be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // in this implementation, but warn on overflow. 977be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell bool multi_char_too_long = false; 978be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (isAscii() && isMultiChar()) { 979be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell LitVal = 0; 980be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell for (size_t i=0;i<NumCharsSoFar;++i) { 981be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // check for enough leading zeros to shift into 982be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell multi_char_too_long |= (LitVal.countLeadingZeros() < 8); 983be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell LitVal <<= 8; 984be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell LitVal = LitVal + (codepoint_buffer[i] & 0xFF); 985be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 986be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } else if (NumCharsSoFar > 0) { 987be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell // otherwise just take the last character 988be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell LitVal = buffer_begin[-1]; 989be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 990be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 991be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell if (!HadError && multi_char_too_long) { 992be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell PP.Diag(Loc,diag::warn_char_constant_too_large); 993be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell } 994be773526230b5a7121a8b321b05f2e53fa473f5cSeth Cantrell 9954bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta // Transfer the value from APInt to uint64_t 9964bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta Value = LitVal.getZExtValue(); 9971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is a single narrow character, sign extend it (e.g. '\xFF' is "-1") 9995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // if 'char' is signed for this target (C99 6.4.4.4p10). Note that multiple 10005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // character constants are not sign extended in the this implementation: 10015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // '\xFF\xFF' = 65536 and '\x0\xFF' = 255, which matches GCC. 10025cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (isAscii() && NumCharsSoFar == 1 && (Value & 128) && 10034e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie PP.getLangOpts().CharIsSigned) 10045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Value = (signed char)Value; 10055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 10065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 10075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 10082fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// string-literal: [C++0x lex.string] 10092fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// encoding-prefix " [s-char-sequence] " 10102fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// encoding-prefix R raw-string 10112fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// encoding-prefix: 10122fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// u8 10132fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// u 10142fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// U 10152fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// L 10165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char-sequence: 10175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char 10185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char-sequence s-char 10195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char: 10202fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// any member of the source character set except the double-quote ", 10212fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// backslash \, or new-line character 10222fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// escape-sequence 10235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// universal-character-name 10242fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// raw-string: 10252fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// " d-char-sequence ( r-char-sequence ) d-char-sequence " 10262fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// r-char-sequence: 10272fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// r-char 10282fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// r-char-sequence r-char 10292fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// r-char: 10302fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// any member of the source character set, except a right parenthesis ) 10312fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// followed by the initial d-char-sequence (which may be empty) 10322fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// followed by a double quote ". 10332fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// d-char-sequence: 10342fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// d-char 10352fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// d-char-sequence d-char 10362fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// d-char: 10372fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// any member of the basic source character set except: 10382fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// space, the left parenthesis (, the right parenthesis ), 10392fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// the backslash \, and the control characters representing horizontal 10402fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// tab, vertical tab, form feed, and newline. 10412fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// escape-sequence: [C++0x lex.ccon] 10422fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// simple-escape-sequence 10432fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// octal-escape-sequence 10442fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence 10452fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// simple-escape-sequence: 1046ddddd48da72bc29d1c3f388ed91ea5549328129eNAKAMURA Takumi/// one of \' \" \? \\ \a \b \f \n \r \t \v 10472fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// octal-escape-sequence: 10482fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit 10492fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit octal-digit 10502fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \ octal-digit octal-digit octal-digit 10512fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence: 10522fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// \x hexadecimal-digit 10532fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// hexadecimal-escape-sequence hexadecimal-digit 10545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// universal-character-name: 10555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// \u hex-quad 10565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// \U hex-quad hex-quad 10575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hex-quad: 10585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hex-digit hex-digit hex-digit hex-digit 10595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 10605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerStringLiteralParser:: 1061d217773f106856a11879ec79dc468efefaf2ee75Chris LattnerStringLiteralParser(const Token *StringToks, unsigned NumStringToks, 10620833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner Preprocessor &PP, bool Complain) 10634e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie : SM(PP.getSourceManager()), Features(PP.getLangOpts()), 1064403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis Target(PP.getTargetInfo()), Diags(Complain ? &PP.getDiagnostics() : 0), 10655cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor MaxTokenLength(0), SizeBound(0), CharByteWidth(0), Kind(tok::unknown), 10665cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor ResultPtr(ResultBuf.data()), hadError(false), Pascal(false) { 10670833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner init(StringToks, NumStringToks); 10680833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner} 10690833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner 10700833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattnervoid StringLiteralParser::init(const Token *StringToks, unsigned NumStringToks){ 1071403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis // The literal token may have come from an invalid source location (e.g. due 1072403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis // to a PCH error), in which case the token length will be 0. 10733144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis if (NumStringToks == 0 || StringToks[0].getLength() < 2) 10743144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis return DiagnoseLexingError(SourceLocation()); 1075403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis 10765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Scan all of the string portions, remember the max individual token length, 10775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // computing a bound on the concatenated string length, and see whether any 10785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // piece is a wide-string. If any of the string portions is a wide-string 10795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // literal, the result is a wide-string literal [C99 6.4.5p4]. 1080403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis assert(NumStringToks && "expected at least one token"); 10816cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt MaxTokenLength = StringToks[0].getLength(); 1082403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis assert(StringToks[0].getLength() >= 2 && "literal token is invalid!"); 10836cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt SizeBound = StringToks[0].getLength()-2; // -2 for "". 10845cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Kind = StringToks[0].getKind(); 10856cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt 10866cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt hadError = false; 10875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 10885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Implement Translation Phase #6: concatenation of string literals 10895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// (C99 5.1.1.2p1). The common case is only one string fragment. 10905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 1; i != NumStringToks; ++i) { 10913144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis if (StringToks[i].getLength() < 2) 10923144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis return DiagnoseLexingError(StringToks[i].getLocation()); 1093403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis 10945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // The string could be shorter than this if it needs cleaning, but this is a 10955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // reasonable bound, which is all we need. 1096403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis assert(StringToks[i].getLength() >= 2 && "literal token is invalid!"); 10976cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt SizeBound += StringToks[i].getLength()-2; // -2 for "". 10981eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remember maximum string piece length. 11006cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt if (StringToks[i].getLength() > MaxTokenLength) 11016cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt MaxTokenLength = StringToks[i].getLength(); 11021eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11035cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // Remember if we see any wide or utf-8/16/32 strings. 11045cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // Also check for illegal concatenations. 11055cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (StringToks[i].isNot(Kind) && StringToks[i].isNot(tok::string_literal)) { 11065cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (isAscii()) { 11075cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Kind = StringToks[i].getKind(); 11085cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } else { 11095cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (Diags) 11105cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Diags->Report(FullSourceLoc(StringToks[i].getLocation(), SM), 11115cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor diag::err_unsupported_string_concat); 11125cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor hadError = true; 11135cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } 11145cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor } 11155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1116dbb1ecc32ca122b07b7c98fd0a8f6f53985adaccChris Lattner 11175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Include space for the null terminator. 11185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++SizeBound; 11191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // TODO: K&R warning: "traditional C rejects string constant concatenation" 11211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11225cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // Get the width in bytes of char/wchar_t/char16_t/char32_t 11235cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor CharByteWidth = getCharWidth(Kind, Target); 11245cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert((CharByteWidth & 7) == 0 && "Assumes character size is byte multiple"); 11255cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor CharByteWidth /= 8; 11261eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // The output buffer size needs to be large enough to hold wide characters. 11285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // This is a worst-case assumption which basically corresponds to L"" "long". 11295cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor SizeBound *= CharByteWidth; 11301eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Size the temporary buffer to hold the result string data. 11325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultBuf.resize(SizeBound); 11331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Likewise, but for each string piece. 1135f7ccbad5d9949e7ddd1cbef43d482553b811e026Dylan Noblesmith SmallString<512> TokenBuf; 11365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer TokenBuf.resize(MaxTokenLength); 11371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Loop over all the strings, getting their spelling, and expanding them to 11395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // wide strings as appropriate. 11405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultPtr = &ResultBuf[0]; // Next byte to fill in. 11411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1142ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson Pascal = false; 11431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11445cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith SourceLocation UDSuffixTokLoc; 11455cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 11465f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 0, e = NumStringToks; i != e; ++i) { 11475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *ThisTokBuf = &TokenBuf[0]; 11485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Get the spelling of the token, which eliminates trigraphs, etc. We know 11495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // that ThisTokBuf points to a buffer that is big enough for the whole token 11505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // and 'spelled' tokens can only shrink. 115150f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor bool StringInvalid = false; 11520833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner unsigned ThisTokLen = 1153b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner Lexer::getSpelling(StringToks[i], ThisTokBuf, SM, Features, 1154b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner &StringInvalid); 11553144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis if (StringInvalid) 11563144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis return DiagnoseLexingError(StringToks[i].getLocation()); 115750f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor 115826b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith const char *ThisTokBegin = ThisTokBuf; 11595cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith const char *ThisTokEnd = ThisTokBuf+ThisTokLen; 11605cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 11615cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // Remove an optional ud-suffix. 11625cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith if (ThisTokEnd[-1] != '"') { 11635cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith const char *UDSuffixEnd = ThisTokEnd; 11645cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith do { 11655cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith --ThisTokEnd; 11665cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } while (ThisTokEnd[-1] != '"'); 11675cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 11685cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith StringRef UDSuffix(ThisTokEnd, UDSuffixEnd - ThisTokEnd); 11695cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 11705cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith if (UDSuffixBuf.empty()) { 11715cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith UDSuffixBuf.assign(UDSuffix); 1172dd66be718f23c8149d74ae8b011b002e11e8d5baRichard Smith UDSuffixToken = i; 1173dd66be718f23c8149d74ae8b011b002e11e8d5baRichard Smith UDSuffixOffset = ThisTokEnd - ThisTokBuf; 11745cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith UDSuffixTokLoc = StringToks[i].getLocation(); 11755cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } else if (!UDSuffixBuf.equals(UDSuffix)) { 11765cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // C++11 [lex.ext]p8: At the end of phase 6, if a string literal is the 11775cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // result of a concatenation involving at least one user-defined-string- 11785cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // literal, all the participating user-defined-string-literals shall 11795cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // have the same ud-suffix. 11805cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith if (Diags) { 11815cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith SourceLocation TokLoc = StringToks[i].getLocation(); 11825cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith Diags->Report(TokLoc, diag::err_string_concat_mixed_suffix) 11835cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith << UDSuffixBuf << UDSuffix 11845cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith << SourceRange(UDSuffixTokLoc, UDSuffixTokLoc) 11855cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith << SourceRange(TokLoc, TokLoc); 11865cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } 11875cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith hadError = true; 11885cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } 11895cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith } 11905cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 11915cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith // Strip the end quote. 11925cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith --ThisTokEnd; 11935cc2c6eb67b6e5361bbe96f79b519fd62ec666d6Richard Smith 11945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // TODO: Input character set mapping support. 11951eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 11961661d717563d6a27dec3da69deba2b2efaa45802Craig Topper // Skip marker for wide or unicode strings. 11975cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (ThisTokBuf[0] == 'L' || ThisTokBuf[0] == 'u' || ThisTokBuf[0] == 'U') { 11985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 11995cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // Skip 8 of u8 marker for utf8 strings. 12005cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (ThisTokBuf[0] == '8') 12015cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor ++ThisTokBuf; 120256bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian } 12031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12042fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Check for raw string 12052fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (ThisTokBuf[0] == 'R') { 12062fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ThisTokBuf += 2; // skip R" 12071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12082fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper const char *Prefix = ThisTokBuf; 12092fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper while (ThisTokBuf[0] != '(') 1210ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson ++ThisTokBuf; 12112fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ++ThisTokBuf; // skip '(' 12122fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 121349d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith // Remove same number of characters from the end 121449d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith ThisTokEnd -= ThisTokBuf - Prefix; 121549d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith assert(ThisTokEnd >= ThisTokBuf && "malformed raw string literal"); 12162fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 12172fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Copy the string over 121849d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith if (CopyStringFragment(StringRef(ThisTokBuf, ThisTokEnd - ThisTokBuf))) 121991359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman if (DiagnoseBadString(StringToks[i])) 122091359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman hadError = true; 12212fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } else { 122207a075870110a8376ddc1cd09412a0ec00987153Argyrios Kyrtzidis if (ThisTokBuf[0] != '"') { 122307a075870110a8376ddc1cd09412a0ec00987153Argyrios Kyrtzidis // The file may have come from PCH and then changed after loading the 122407a075870110a8376ddc1cd09412a0ec00987153Argyrios Kyrtzidis // PCH; Fail gracefully. 12253144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis return DiagnoseLexingError(StringToks[i].getLocation()); 122607a075870110a8376ddc1cd09412a0ec00987153Argyrios Kyrtzidis } 12272fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ++ThisTokBuf; // skip " 12282fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 12292fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Check if this is a pascal string 12302fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (Features.PascalStrings && ThisTokBuf + 1 != ThisTokEnd && 12312fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ThisTokBuf[0] == '\\' && ThisTokBuf[1] == 'p') { 12321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12332fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // If the \p sequence is found in the first token, we have a pascal string 12342fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Otherwise, if we already have a pascal string, ignore the first \p 12352fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (i == 0) { 12365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 12372fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper Pascal = true; 12382fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } else if (Pascal) 12392fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ThisTokBuf += 2; 12405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 12411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 12422fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper while (ThisTokBuf != ThisTokEnd) { 12432fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Is this a span of non-escape characters? 12442fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (ThisTokBuf[0] != '\\') { 12452fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper const char *InStart = ThisTokBuf; 12462fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper do { 12472fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ++ThisTokBuf; 12482fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } while (ThisTokBuf != ThisTokEnd && ThisTokBuf[0] != '\\'); 12492fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 12502fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Copy the character span over. 125149d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith if (CopyStringFragment(StringRef(InStart, ThisTokBuf - InStart))) 125291359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman if (DiagnoseBadString(StringToks[i])) 125391359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman hadError = true; 12542fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper continue; 12552fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } 12562fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Is this a Universal Character Name escape? 12572fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (ThisTokBuf[1] == 'u' || ThisTokBuf[1] == 'U') { 125826b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith EncodeUCNEscape(ThisTokBegin, ThisTokBuf, ThisTokEnd, 125926b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith ResultPtr, hadError, 126026b75c07317a3b50a8a00a1623e3ef38af1d8349Richard Smith FullSourceLoc(StringToks[i].getLocation(), SM), 12612fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper CharByteWidth, Diags, Features); 12622fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper continue; 12632fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } 12642fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Otherwise, this is a non-UCN escape character. Process it. 12652fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper unsigned ResultChar = 12662fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ProcessCharEscape(ThisTokBuf, ThisTokEnd, hadError, 12672fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper FullSourceLoc(StringToks[i].getLocation(), SM), 12682fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper CharByteWidth*8, Diags); 12692fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 1270caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman if (CharByteWidth == 4) { 1271caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // FIXME: Make the type of the result buffer correct instead of 1272caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // using reinterpret_cast. 1273caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman UTF32 *ResultWidePtr = reinterpret_cast<UTF32*>(ResultPtr); 12749b483df983759d51d61d54e8ae34bff423d15403Nico Weber *ResultWidePtr = ResultChar; 1275caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultPtr += 4; 1276caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman } else if (CharByteWidth == 2) { 1277caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // FIXME: Make the type of the result buffer correct instead of 1278caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman // using reinterpret_cast. 1279caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman UTF16 *ResultWidePtr = reinterpret_cast<UTF16*>(ResultPtr); 12809b483df983759d51d61d54e8ae34bff423d15403Nico Weber *ResultWidePtr = ResultChar & 0xFFFF; 1281caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman ResultPtr += 2; 1282caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman } else { 1283caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman assert(CharByteWidth == 1 && "Unexpected char width"); 1284caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman *ResultPtr++ = ResultChar & 0xFF; 1285caf1f26777c3adf2556c3af7bf9e01bd8ead17d9Eli Friedman } 12862fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } 12875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 12885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 12891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1290bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner if (Pascal) { 129122508f410b3d727d5c557af3304c0a1bad94999eEli Friedman if (CharByteWidth == 4) { 129222508f410b3d727d5c557af3304c0a1bad94999eEli Friedman // FIXME: Make the type of the result buffer correct instead of 129322508f410b3d727d5c557af3304c0a1bad94999eEli Friedman // using reinterpret_cast. 129422508f410b3d727d5c557af3304c0a1bad94999eEli Friedman UTF32 *ResultWidePtr = reinterpret_cast<UTF32*>(ResultBuf.data()); 129522508f410b3d727d5c557af3304c0a1bad94999eEli Friedman ResultWidePtr[0] = GetNumStringChars() - 1; 129622508f410b3d727d5c557af3304c0a1bad94999eEli Friedman } else if (CharByteWidth == 2) { 129722508f410b3d727d5c557af3304c0a1bad94999eEli Friedman // FIXME: Make the type of the result buffer correct instead of 129822508f410b3d727d5c557af3304c0a1bad94999eEli Friedman // using reinterpret_cast. 129922508f410b3d727d5c557af3304c0a1bad94999eEli Friedman UTF16 *ResultWidePtr = reinterpret_cast<UTF16*>(ResultBuf.data()); 130022508f410b3d727d5c557af3304c0a1bad94999eEli Friedman ResultWidePtr[0] = GetNumStringChars() - 1; 130122508f410b3d727d5c557af3304c0a1bad94999eEli Friedman } else { 130222508f410b3d727d5c557af3304c0a1bad94999eEli Friedman assert(CharByteWidth == 1 && "Unexpected char width"); 130322508f410b3d727d5c557af3304c0a1bad94999eEli Friedman ResultBuf[0] = GetNumStringChars() - 1; 130422508f410b3d727d5c557af3304c0a1bad94999eEli Friedman } 1305bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner 1306bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner // Verify that pascal strings aren't too large. 13070833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner if (GetStringLength() > 256) { 13080833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner if (Diags) 13090833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner Diags->Report(FullSourceLoc(StringToks[0].getLocation(), SM), 13100833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner diag::err_pascal_string_too_long) 13110833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner << SourceRange(StringToks[0].getLocation(), 13120833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner StringToks[NumStringToks-1].getLocation()); 13135cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor hadError = true; 131457d7dde770c67b282e7fb77b1b81e429910937b3Eli Friedman return; 131557d7dde770c67b282e7fb77b1b81e429910937b3Eli Friedman } 13160833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner } else if (Diags) { 1317427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor // Complain if this string literal has too many characters. 1318a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner unsigned MaxChars = Features.CPlusPlus? 65536 : Features.C99 ? 4095 : 509; 1319427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor 1320427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor if (GetNumStringChars() > MaxChars) 13210833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner Diags->Report(FullSourceLoc(StringToks[0].getLocation(), SM), 13220833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner diag::ext_string_too_long) 1323427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor << GetNumStringChars() << MaxChars 1324a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner << (Features.CPlusPlus ? 2 : Features.C99 ? 1 : 0) 1325427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor << SourceRange(StringToks[0].getLocation(), 1326427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor StringToks[NumStringToks-1].getLocation()); 1327bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner } 13285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1329719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1330719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 13312fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// copyStringFragment - This function copies from Start to End into ResultPtr. 13322fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// Performs widening for multi-byte characters. 1333f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedmanbool StringLiteralParser::CopyStringFragment(StringRef Fragment) { 1334f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman assert(CharByteWidth==1 || CharByteWidth==2 || CharByteWidth==4); 1335f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman ConversionResult result = conversionOK; 13362fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Copy the character span over. 13372fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (CharByteWidth == 1) { 133849d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith if (!isLegalUTF8String(reinterpret_cast<const UTF8*>(Fragment.begin()), 133949d517467c3dcd2c67e8a6c740ba5160e37625f7Richard Smith reinterpret_cast<const UTF8*>(Fragment.end()))) 134091359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman result = sourceIllegal; 13412fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper memcpy(ResultPtr, Fragment.data(), Fragment.size()); 13422fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper ResultPtr += Fragment.size(); 1343f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman } else if (CharByteWidth == 2) { 1344f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman UTF8 const *sourceStart = (UTF8 const *)Fragment.data(); 1345f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman // FIXME: Make the type of the result buffer correct instead of 1346f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman // using reinterpret_cast. 1347f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman UTF16 *targetStart = reinterpret_cast<UTF16*>(ResultPtr); 134891359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman ConversionFlags flags = strictConversion; 1349f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman result = ConvertUTF8toUTF16( 1350f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman &sourceStart,sourceStart + Fragment.size(), 1351f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman &targetStart,targetStart + 2*Fragment.size(),flags); 1352f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman if (result==conversionOK) 1353f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman ResultPtr = reinterpret_cast<char*>(targetStart); 1354f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman } else if (CharByteWidth == 4) { 1355f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman UTF8 const *sourceStart = (UTF8 const *)Fragment.data(); 1356f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman // FIXME: Make the type of the result buffer correct instead of 1357f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman // using reinterpret_cast. 1358f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman UTF32 *targetStart = reinterpret_cast<UTF32*>(ResultPtr); 135991359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman ConversionFlags flags = strictConversion; 1360f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman result = ConvertUTF8toUTF32( 1361f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman &sourceStart,sourceStart + Fragment.size(), 1362f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman &targetStart,targetStart + 4*Fragment.size(),flags); 1363f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman if (result==conversionOK) 1364f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman ResultPtr = reinterpret_cast<char*>(targetStart); 13652fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } 1366f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman assert((result != targetExhausted) 1367f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman && "ConvertUTF8toUTFXX exhausted target buffer"); 1368f74a4587629615ffd13bd0724868f86ba8c8f27bEli Friedman return result != conversionOK; 13692fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper} 13702fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 137191359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedmanbool StringLiteralParser::DiagnoseBadString(const Token &Tok) { 137291359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // If we see bad encoding for unprefixed string literals, warn and 137391359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // simply copy the byte values, for compatibility with gcc and older 137491359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman // versions of clang. 137591359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman bool NoErrorOnBadEncoding = isAscii(); 137691359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman unsigned Msg = NoErrorOnBadEncoding ? diag::warn_bad_string_encoding : 137791359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman diag::err_bad_string_encoding; 137891359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman if (Diags) 137991359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman Diags->Report(FullSourceLoc(Tok.getLocation(), SM), Msg); 138091359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman return !NoErrorOnBadEncoding; 138191359302b822d829afa93c0dadf5f7ce6e19fbc6Eli Friedman} 13822fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 13833144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidisvoid StringLiteralParser::DiagnoseLexingError(SourceLocation Loc) { 13843144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis hadError = true; 13853144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis if (Diags) 13863144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis Diags->Report(Loc, diag::err_lexing_string); 13873144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis} 13883144749f8bf9bbf7c027f2161a930bff80ad6f72Argyrios Kyrtzidis 1389719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner/// getOffsetOfStringByte - This function returns the offset of the 1390719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner/// specified byte of the string data represented by Token. This handles 1391719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner/// advancing over escape sequences in the string. 1392719e61573f27c11057ecfe0dd8f141621602c571Chris Lattnerunsigned StringLiteralParser::getOffsetOfStringByte(const Token &Tok, 13936c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner unsigned ByteNo) const { 1394719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Get the spelling of the token. 1395f7ccbad5d9949e7ddd1cbef43d482553b811e026Dylan Noblesmith SmallString<32> SpellingBuffer; 13966cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt SpellingBuffer.resize(Tok.getLength()); 13971eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 139850f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor bool StringInvalid = false; 1399719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner const char *SpellingPtr = &SpellingBuffer[0]; 1400b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner unsigned TokLen = Lexer::getSpelling(Tok, SpellingPtr, SM, Features, 1401b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner &StringInvalid); 140291f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (StringInvalid) 140350f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor return 0; 1404719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1405df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const char *SpellingStart = SpellingPtr; 1406df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const char *SpellingEnd = SpellingPtr+TokLen; 1407df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 1408df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // Handle UTF-8 strings just like narrow strings. 1409df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (SpellingPtr[0] == 'u' && SpellingPtr[1] == '8') 1410df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith SpellingPtr += 2; 1411df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 14125cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor assert(SpellingPtr[0] != 'L' && SpellingPtr[0] != 'u' && 14135cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor SpellingPtr[0] != 'U' && "Doesn't handle wide or utf strings yet"); 1414719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1415df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // For raw string literals, this is easy. 1416df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (SpellingPtr[0] == 'R') { 1417df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith assert(SpellingPtr[1] == '"' && "Should be a raw string literal!"); 1418df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // Skip 'R"'. 1419df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith SpellingPtr += 2; 1420df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith while (*SpellingPtr != '(') { 1421df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith ++SpellingPtr; 1422df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith assert(SpellingPtr < SpellingEnd && "Missing ( for raw string literal"); 1423df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 1424df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // Skip '('. 1425df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith ++SpellingPtr; 1426df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith return SpellingPtr - SpellingStart + ByteNo; 1427df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 14281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1429df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // Skip over the leading quote 1430719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(SpellingPtr[0] == '"' && "Should be a string literal!"); 1431719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner ++SpellingPtr; 14321eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1433719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Skip over bytes until we find the offset we're looking for. 1434719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner while (ByteNo) { 1435719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(SpellingPtr < SpellingEnd && "Didn't find byte offset!"); 14361eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1437719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Step over non-escapes simply. 1438719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner if (*SpellingPtr != '\\') { 1439719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner ++SpellingPtr; 1440719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner --ByteNo; 1441719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner continue; 1442719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner } 14431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1444719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Otherwise, this is an escape character. Advance over it. 1445719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner bool HadError = false; 1446df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (SpellingPtr[1] == 'u' || SpellingPtr[1] == 'U') { 1447df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith const char *EscapePtr = SpellingPtr; 1448df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith unsigned Len = MeasureUCNEscape(SpellingStart, SpellingPtr, SpellingEnd, 1449df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith 1, Features, HadError); 1450df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith if (Len > ByteNo) { 1451df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith // ByteNo is somewhere within the escape sequence. 1452df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith SpellingPtr = EscapePtr; 1453df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith break; 1454df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 1455df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith ByteNo -= Len; 1456df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } else { 1457df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith ProcessCharEscape(SpellingPtr, SpellingEnd, HadError, 1458df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith FullSourceLoc(Tok.getLocation(), SM), 1459df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith CharByteWidth*8, Diags); 1460df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith --ByteNo; 1461df9ef1bc8c3780307ab2ed81bf5e31c23310b936Richard Smith } 1462719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(!HadError && "This method isn't valid on erroneous strings"); 1463719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner } 14641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1465719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner return SpellingPtr-SpellingStart; 1466719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner} 1467