LiteralSupport.cpp revision 5f9e272e632e951b1efe824cd16acb4d96077930
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" 195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer#include "llvm/ADT/StringExtras.h" 205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerusing namespace clang; 215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// HexDigitValue - Return the value of the specified hex digit, or -1 if it's 235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// not valid. 245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstatic int HexDigitValue(char C) { 255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (C >= '0' && C <= '9') return C-'0'; 265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (C >= 'a' && C <= 'f') return C-'a'+10; 275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (C >= 'A' && C <= 'F') return C-'A'+10; 285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return -1; 295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// ProcessCharEscape - Parse a standard C escape sequence, which can occur in 325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// either a character or a string literal. 335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerstatic unsigned ProcessCharEscape(const char *&ThisTokBuf, 345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *ThisTokEnd, bool &HadError, 3591f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner FullSourceLoc Loc, bool IsWide, 3691f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diagnostic *Diags, const TargetInfo &Target) { 375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Skip the '\' char. 385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // We know that this character can't be off the end of the buffer, because 415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // that would have been \", which would not have been the end of string. 425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned ResultChar = *ThisTokBuf++; 435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer switch (ResultChar) { 445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // These map to themselves. 455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '\\': case '\'': case '"': case '?': break; 461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 475f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // These have fixed mappings. 485f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'a': 495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // TODO: K&R: the meaning of '\\a' is different in traditional C 505f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 7; 515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'b': 535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 8; 545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'e': 5691f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 5791f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_nonstandard_escape) << "e"; 585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 27; 595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 603c54801fbc67d8df2fed0711a2e2022db6b1bbcfEli Friedman case 'E': 6191f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 6291f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_nonstandard_escape) << "E"; 633c54801fbc67d8df2fed0711a2e2022db6b1bbcfEli Friedman ResultChar = 27; 643c54801fbc67d8df2fed0711a2e2022db6b1bbcfEli Friedman break; 655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'f': 665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 12; 675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'n': 695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 10; 705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'r': 725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 13; 735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 't': 755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 9; 765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'v': 785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 11; 795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case 'x': { // Hex escape. 815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 0; 825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ThisTokBuf == ThisTokEnd || !isxdigit(*ThisTokBuf)) { 8391f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 8491f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::err_hex_escape_no_digits); 855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer HadError = 1; 865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 875f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Hex escapes are a maximal series of hex digits. 905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool Overflow = false; 915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (; ThisTokBuf != ThisTokEnd; ++ThisTokBuf) { 925f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer int CharVal = HexDigitValue(ThisTokBuf[0]); 935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CharVal == -1) break; 94c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // About to shift out a digit? 95c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner Overflow |= (ResultChar & 0xF0000000) ? true : false; 965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar <<= 4; 975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar |= CharVal; 985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // See if any bits will be truncated when evaluated as a character. 10191f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner unsigned CharWidth = 10291f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner IsWide ? Target.getWCharWidth() : Target.getCharWidth(); 1031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) { 1055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Overflow = true; 1065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar &= ~0U >> (32-CharWidth); 1075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Check for overflow. 11091f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Overflow && Diags) // Too many digits to fit in 11191f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::warn_hex_escape_too_large); 1125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '0': case '1': case '2': case '3': 1155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '4': case '5': case '6': case '7': { 1165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Octal escapes. 1175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer --ThisTokBuf; 1185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = 0; 1195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Octal escapes are a series of octal digits with maximum length 3. 1215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // "\0123" is a two digit sequence equal to "\012" "3". 1225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned NumDigits = 0; 1235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer do { 1245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar <<= 3; 1255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar |= *ThisTokBuf++ - '0'; 1265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++NumDigits; 1275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } while (ThisTokBuf != ThisTokEnd && NumDigits < 3 && 1285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ThisTokBuf[0] >= '0' && ThisTokBuf[0] <= '7'); 1291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Check for overflow. Reject '\777', but not L'\777'. 13191f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner unsigned CharWidth = 13291f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner IsWide ? Target.getWCharWidth() : Target.getCharWidth(); 1331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (CharWidth != 32 && (ResultChar >> CharWidth) != 0) { 13591f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 13691f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::warn_octal_escape_too_large); 1375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar &= ~0U >> (32-CharWidth); 1385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1411eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Otherwise, these are not valid escapes. 1435f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer case '(': case '{': case '[': case '%': 1445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // GCC accepts these as extensions. We warn about them as such though. 14591f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags) 14691f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_nonstandard_escape) 147b90f4b3fb94056609da9cca5eef7358d95a363b2Douglas Gregor << std::string()+(char)ResultChar; 148f01fdff97b245caac98100d232c760b4d0531411Eli Friedman break; 1495f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer default: 15091f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (Diags == 0) 151b90f4b3fb94056609da9cca5eef7358d95a363b2Douglas Gregor break; 152b90f4b3fb94056609da9cca5eef7358d95a363b2Douglas Gregor 15323ef69d197ba3b5e9602f7161fee50990059502aTed Kremenek if (isgraph(ResultChar)) 15491f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_unknown_escape) 15591f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner << std::string()+(char)ResultChar; 156ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner else 15791f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner Diags->Report(Loc, diag::ext_unknown_escape) 15891f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner << "x"+llvm::utohexstr(ResultChar); 1595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer break; 1605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 1611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return ResultChar; 1635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 1650e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff/// ProcessUCNEscape - Read the Universal Character Name, check constraints and 16659705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// return the UTF32. 16759705aee3fe01aa6fb6962dd11350161b47983d9Nico Weberstatic bool ProcessUCNEscape(const char *&ThisTokBuf, const char *ThisTokEnd, 16859705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber uint32_t &UcnVal, unsigned short &UcnLen, 169872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner FullSourceLoc Loc, Diagnostic *Diags, 1706c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner const LangOptions &Features) { 1716c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner if (!Features.CPlusPlus && !Features.C99 && Diags) 172872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner Diags->Report(Loc, diag::warn_ucn_not_valid_in_c89); 1731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1744e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff // Save the beginning of the string (for error diagnostics). 1754e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff const char *ThisTokBegin = ThisTokBuf; 1761eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1770e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Skip the '\u' char's. 1780e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff ThisTokBuf += 2; 1790e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff 1800e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (ThisTokBuf == ThisTokEnd || !isxdigit(*ThisTokBuf)) { 1816c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner if (Diags) 182872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner Diags->Report(Loc, diag::err_ucn_escape_no_digits); 18359705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return false; 1840e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 18559705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber UcnLen = (ThisTokBuf[-1] == 'u' ? 4 : 8); 18656bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian unsigned short UcnLenSave = UcnLen; 18759705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber for (; ThisTokBuf != ThisTokEnd && UcnLenSave; ++ThisTokBuf, UcnLenSave--) { 1880e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff int CharVal = HexDigitValue(ThisTokBuf[0]); 1890e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (CharVal == -1) break; 1900e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff UcnVal <<= 4; 1910e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff UcnVal |= CharVal; 1920e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 1930e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // If we didn't consume the proper number of digits, there is a problem. 19459705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber if (UcnLenSave) { 195872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner if (Diags) { 1967ef5c27eb6e8ebe58b52013246c06753c3613263Chris Lattner SourceLocation L = 1977ef5c27eb6e8ebe58b52013246c06753c3613263Chris Lattner Lexer::AdvanceToTokenCharacter(Loc, ThisTokBuf-ThisTokBegin, 1987ef5c27eb6e8ebe58b52013246c06753c3613263Chris Lattner Loc.getManager(), Features); 1997ef5c27eb6e8ebe58b52013246c06753c3613263Chris Lattner Diags->Report(FullSourceLoc(L, Loc.getManager()), 2007ef5c27eb6e8ebe58b52013246c06753c3613263Chris Lattner diag::err_ucn_escape_incomplete); 201872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner } 20259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return false; 2030e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 2041eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // Check UCN constraints (C99 6.4.3p2). 2050e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if ((UcnVal < 0xa0 && 2060e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff (UcnVal != 0x24 && UcnVal != 0x40 && UcnVal != 0x60 )) // $, @, ` 2071eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump || (UcnVal >= 0xD800 && UcnVal <= 0xDFFF) 2088a5c0cd90b8d607ca284274000ed8716b836d253Steve Naroff || (UcnVal > 0x10FFFF)) /* the maximum legal UTF32 value */ { 2096c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner if (Diags) 210872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner Diags->Report(Loc, diag::err_ucn_escape_invalid); 21159705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return false; 21259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber } 21359705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber return true; 21459705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber} 21559705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber 21659705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// EncodeUCNEscape - Read the Universal Character Name, check constraints and 21759705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// convert the UTF32 to UTF8 or UTF16. This is a subroutine of 21859705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// StringLiteralParser. When we decide to implement UCN's for identifiers, 21959705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber/// we will likely rework our support for UCN's. 22059705aee3fe01aa6fb6962dd11350161b47983d9Nico Weberstatic void EncodeUCNEscape(const char *&ThisTokBuf, const char *ThisTokEnd, 221a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner char *&ResultBuf, bool &HadError, 222a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner FullSourceLoc Loc, bool wide, Diagnostic *Diags, 223a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner const LangOptions &Features) { 22459705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber typedef uint32_t UTF32; 22559705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber UTF32 UcnVal = 0; 22659705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber unsigned short UcnLen = 0; 227a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner if (!ProcessUCNEscape(ThisTokBuf, ThisTokEnd, UcnVal, UcnLen, Loc, Diags, 228a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner Features)) { 2290e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff HadError = 1; 2300e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff return; 2310e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 23259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber 23356bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian if (wide) { 23459705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber (void)UcnLen; 235a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner assert((UcnLen== 4 || UcnLen== 8) && "only ucn length of 4 or 8 supported"); 236a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber 237a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner if (!Features.ShortWChar) { 238a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber // Note: our internal rep of wide char tokens is always little-endian. 239a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (UcnVal & 0x000000FF); 240a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (UcnVal & 0x0000FF00) >> 8; 241a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (UcnVal & 0x00FF0000) >> 16; 242a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (UcnVal & 0xFF000000) >> 24; 243a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber return; 244a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber } 245a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber 246a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber // Convert to UTF16. 247a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber if (UcnVal < (UTF32)0xFFFF) { 248a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (UcnVal & 0x000000FF); 249a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (UcnVal & 0x0000FF00) >> 8; 250a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber return; 251a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber } 252a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner if (Diags) Diags->Report(Loc, diag::warn_ucn_escape_too_large); 253a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber 254a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber typedef uint16_t UTF16; 255a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber UcnVal -= 0x10000; 256a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber UTF16 surrogate1 = 0xD800 + (UcnVal >> 10); 257a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber UTF16 surrogate2 = 0xDC00 + (UcnVal & 0x3FF); 258a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (surrogate1 & 0x000000FF); 259a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (surrogate1 & 0x0000FF00) >> 8; 260a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (surrogate2 & 0x000000FF); 261a0f15b0848405ae16d63bd5d78c862a6526b338aNico Weber *ResultBuf++ = (surrogate2 & 0x0000FF00) >> 8; 26256bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian return; 26356bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian } 2640e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Now that we've parsed/checked the UCN, we convert from UTF32->UTF8. 2650e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // The conversion below was inspired by: 2660e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // http://www.unicode.org/Public/PROGRAMS/CVTUTF/ConvertUTF.c 2671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // First, we determine how many bytes the result will require. 2684e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff typedef uint8_t UTF8; 2690e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff 2700e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff unsigned short bytesToWrite = 0; 2710e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (UcnVal < (UTF32)0x80) 2720e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 1; 2730e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff else if (UcnVal < (UTF32)0x800) 2740e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 2; 2750e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff else if (UcnVal < (UTF32)0x10000) 2760e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 3; 2770e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff else 2780e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff bytesToWrite = 4; 2791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2800e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff const unsigned byteMask = 0xBF; 2810e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff const unsigned byteMark = 0x80; 2821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 2830e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Once the bits are split out into bytes of UTF8, this is a mask OR-ed 2848a5c0cd90b8d607ca284274000ed8716b836d253Steve Naroff // into the first byte, depending on how many bytes follow. 2851eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump static const UTF8 firstByteMark[5] = { 2868a5c0cd90b8d607ca284274000ed8716b836d253Steve Naroff 0x00, 0x00, 0xC0, 0xE0, 0xF0 2870e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff }; 2880e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Finally, we write the bytes into ResultBuf. 2890e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff ResultBuf += bytesToWrite; 2900e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff switch (bytesToWrite) { // note: everything falls through. 2910e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 4: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; 2920e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 3: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; 2930e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 2: *--ResultBuf = (UTF8)((UcnVal | byteMark) & byteMask); UcnVal >>= 6; 2940e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff case 1: *--ResultBuf = (UTF8) (UcnVal | firstByteMark[bytesToWrite]); 2950e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff } 2960e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff // Update the buffer. 2970e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff ResultBuf += bytesToWrite; 2980e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff} 2995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// integer-constant: [C99 6.4.4.1] 3025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// decimal-constant integer-suffix 3035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-constant integer-suffix 3045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-constant integer-suffix 3051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// decimal-constant: 3065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// nonzero-digit 3075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// decimal-constant digit 3081eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// octal-constant: 3095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0 3105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-constant octal-digit 3111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// hexadecimal-constant: 3125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-prefix hexadecimal-digit 3135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-constant hexadecimal-digit 3145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-prefix: one of 3155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0x 0X 3165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// integer-suffix: 3175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// unsigned-suffix [long-suffix] 3185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// unsigned-suffix [long-long-suffix] 3195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// long-suffix [unsigned-suffix] 3205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// long-long-suffix [unsigned-sufix] 3215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// nonzero-digit: 3225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 1 2 3 4 5 6 7 8 9 3235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-digit: 3245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0 1 2 3 4 5 6 7 3255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hexadecimal-digit: 3265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 0 1 2 3 4 5 6 7 8 9 3275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// a b c d e f 3285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// A B C D E F 3295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// unsigned-suffix: one of 3305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// u U 3315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// long-suffix: one of 3325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// l L 3331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// long-long-suffix: one of 3345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// ll LL 3355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 3365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// floating-constant: [C99 6.4.4.2] 3375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// TODO: add rules... 3385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 3395f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerNumericLiteralParser:: 3405f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerNumericLiteralParser(const char *begin, const char *end, 3415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SourceLocation TokLoc, Preprocessor &pp) 3425f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer : PP(pp), ThisTokBegin(begin), ThisTokEnd(end) { 3431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 344c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // This routine assumes that the range begin/end matches the regex for integer 345c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // and FP constants (specifically, the 'pp-number' regex), and assumes that 346c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // the byte at "*end" is both valid and not part of the regex. Because of 347c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner // this, it doesn't have to check for 'overscan' in various places. 348c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner assert(!isalnum(*end) && *end != '.' && *end != '_' && 349c29bbde0a14a664d6843b21d3791478d1f4d2833Chris Lattner "Lexer didn't maximally munch?"); 3501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = DigitsBegin = begin; 3525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_exponent = false; 3535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_period = false; 3545f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isLong = false; 3555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isUnsigned = false; 3565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isLongLong = false; 3576e400c286b485e28d04a742ea87860ddfefa672eChris Lattner isFloat = false; 358506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isImaginary = false; 359b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump isMicrosoftInteger = false; 3605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer hadError = false; 3611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 3625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (*s == '0') { // parse radix 363368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner ParseNumberStartingWithZero(TokLoc); 364368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (hadError) 365368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 3665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { // the first digit is non-zero 3675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer radix = 10; 3685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = SkipDigits(s); 3695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (s == ThisTokEnd) { 3705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Done. 371016765e3453db2e302efe53905e99cdb25501234Christopher Lamb } else if (isxdigit(*s) && !(*s == 'e' || *s == 'E')) { 372ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-begin), 3735f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner diag::err_invalid_decimal_digit) << StringRef(s, 1); 374ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 3755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return; 3765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else if (*s == '.') { 3775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s++; 3785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_period = true; 3795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = SkipDigits(s); 3801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump } 3814411f46050216a139ab2fc7ff145ec384d11ec7fChris Lattner if ((*s == 'e' || *s == 'E')) { // exponent 38270f66ab053f36ab3df7a778d09bcb2b4b0fec1f8Chris Lattner const char *Exponent = s; 3835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s++; 3845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer saw_exponent = true; 3855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (*s == '+' || *s == '-') s++; // sign 3865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *first_non_digit = SkipDigits(s); 3870b7f69d789ca1f76582ee9a336e25861fd0c1416Chris Lattner if (first_non_digit != s) { 3885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = first_non_digit; 3890b7f69d789ca1f76582ee9a336e25861fd0c1416Chris Lattner } else { 390ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-begin), 391ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_exponent_has_no_digits); 392ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 3930b7f69d789ca1f76582ee9a336e25861fd0c1416Chris Lattner return; 3945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 3975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 3985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SuffixBegin = s; 3991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 400506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Parse the suffix. At this point we can classify whether we have an FP or 401506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // integer constant. 402506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner bool isFPConstant = isFloatingLiteral(); 4031eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 404506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Loop over all of the characters of the suffix. If we see something bad, 405506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // we break out of the loop. 406506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner for (; s != ThisTokEnd; ++s) { 407506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner switch (*s) { 408506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'f': // FP Suffix for "float" 409506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'F': 410506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (!isFPConstant) break; // Error for integer constant. 4116e400c286b485e28d04a742ea87860ddfefa672eChris Lattner if (isFloat || isLong) break; // FF, LF invalid. 4126e400c286b485e28d04a742ea87860ddfefa672eChris Lattner isFloat = true; 413506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 414506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'u': 415506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'U': 416506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isFPConstant) break; // Error for floating constant. 417506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isUnsigned) break; // Cannot be repeated. 418506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isUnsigned = true; 419506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 420506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'l': 421506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'L': 422506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isLong || isLongLong) break; // Cannot be repeated. 4236e400c286b485e28d04a742ea87860ddfefa672eChris Lattner if (isFloat) break; // LF invalid. 4241eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 425506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Check for long long. The L's need to be adjacent and the same case. 426506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (s+1 != ThisTokEnd && s[1] == s[0]) { 427506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isFPConstant) break; // long long invalid for floats. 428506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isLongLong = true; 429506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner ++s; // Eat both of them. 430506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner } else { 4315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer isLong = true; 4325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 433506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 434506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'i': 435c637415a96c16abc7e28ef83c6c105716f7e8936Chris Lattner case 'I': 4360c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff if (PP.getLangOptions().Microsoft) { 437a8be02b655b76e4dbe776b0c62bc3c450dc6feabFariborz Jahanian if (isFPConstant || isLong || isLongLong) break; 4386e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes 4390c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff // Allow i8, i16, i32, i64, and i128. 440b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump if (s + 1 != ThisTokEnd) { 441b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump switch (s[1]) { 442b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '8': 443b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump s += 2; // i8 suffix 444b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump isMicrosoftInteger = true; 4456e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 446b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '1': 4476e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 2 == ThisTokEnd) break; 448d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[2] == '6') { 449d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 3; // i16 suffix 450d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 451d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 4526e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes else if (s[2] == '2') { 4536e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 3 == ThisTokEnd) break; 454d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[3] == '8') { 455d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 4; // i128 suffix 456d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 457d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 458b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump } 4596e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 460b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '3': 4616e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 2 == ThisTokEnd) break; 462d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[2] == '2') { 463d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 3; // i32 suffix 464d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isLong = true; 465d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 466d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 4676e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 468b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump case '6': 4696e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes if (s + 2 == ThisTokEnd) break; 470d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet if (s[2] == '4') { 471d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet s += 3; // i64 suffix 472d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isLongLong = true; 473d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet isMicrosoftInteger = true; 474d062b604548be6e2f85f6f63a461702e5ea14115Francois Pichet } 4756e8c7acb61b2c7f421d6e1aba8a7a84e96ab6981Nuno Lopes break; 476b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump default: 477b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump break; 478b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump } 479b79fe2d28777652a4df4f49dc876cbec060ca90eMike Stump break; 4800c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff } 4810c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff } 4820c29b22f4384500cc0d04f3072cc5d5d58d10d6cSteve Naroff // fall through. 483506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'j': 484506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner case 'J': 485506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (isImaginary) break; // Cannot be repeated. 486506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-begin), 487506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner diag::ext_imaginary_constant); 488506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner isImaginary = true; 489506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner continue; // Success. 4905f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 491506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // If we reached here, there was an error. 492506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner break; 493506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner } 4941eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 495506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner // Report an error if there are any. 496506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner if (s != ThisTokEnd) { 497ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-begin), 498ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner isFPConstant ? diag::err_invalid_suffix_float_constant : 499ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_invalid_suffix_integer_constant) 5005f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner << StringRef(SuffixBegin, ThisTokEnd-SuffixBegin); 501ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 502506b8dec4ed3db3c60bf9e0dd37901f0cf3d6749Chris Lattner return; 5035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 5045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 5055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 506368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// ParseNumberStartingWithZero - This method is called when the first character 507368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// of the number is found to be a zero. This means it is either an octal 508368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// number (like '04') or a hex number ('0x123a') a binary number ('0b1010') or 5091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump/// a floating point number (01239.123e4). Eat the prefix, determining the 510368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner/// radix etc. 511368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattnervoid NumericLiteralParser::ParseNumberStartingWithZero(SourceLocation TokLoc) { 512368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner assert(s[0] == '0' && "Invalid method call"); 513368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 5141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 515368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Handle a hex number like 0x1234. 516368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if ((*s == 'x' || *s == 'X') && (isxdigit(s[1]) || s[1] == '.')) { 517368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 518368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 16; 519368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner DigitsBegin = s; 520368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipHexDigits(s); 521368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (s == ThisTokEnd) { 522368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Done. 523368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else if (*s == '.') { 524368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 525368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_period = true; 526368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipHexDigits(s); 527368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 528368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // A binary exponent can appear with or with a '.'. If dotted, the 5291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // binary exponent is required. 5308c723404c34e9347fae473489194e8c200c4ac83Sean Hunt if ((*s == 'p' || *s == 'P') && !PP.getLangOptions().CPlusPlus0x) { 531368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *Exponent = s; 532368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 533368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_exponent = true; 534368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == '+' || *s == '-') s++; // sign 535368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *first_non_digit = SkipDigits(s); 5366ea623823f8532670480425b573f35115404b4a0Chris Lattner if (first_non_digit == s) { 537ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-ThisTokBegin), 538ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_exponent_has_no_digits); 539ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 5406ea623823f8532670480425b573f35115404b4a0Chris Lattner return; 541368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 5426ea623823f8532670480425b573f35115404b4a0Chris Lattner s = first_non_digit; 5431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 5448c723404c34e9347fae473489194e8c200c4ac83Sean Hunt // In C++0x, we cannot support hexadecmial floating literals because 5458c723404c34e9347fae473489194e8c200c4ac83Sean Hunt // they conflict with user-defined literals, so we warn in previous 5468c723404c34e9347fae473489194e8c200c4ac83Sean Hunt // versions of C++ by default. 5478c723404c34e9347fae473489194e8c200c4ac83Sean Hunt if (PP.getLangOptions().CPlusPlus) 5488c723404c34e9347fae473489194e8c200c4ac83Sean Hunt PP.Diag(TokLoc, diag::ext_hexconstant_cplusplus); 5498c723404c34e9347fae473489194e8c200c4ac83Sean Hunt else if (!PP.getLangOptions().HexFloats) 550ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(TokLoc, diag::ext_hexconstant_invalid); 551368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else if (saw_period) { 552ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), 553ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_hexconstant_requires_exponent); 554ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 555368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 556368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 557368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 5581eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 559368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Handle simple binary numbers 0b01010 560368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == 'b' || *s == 'B') { 561368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // 0b101010 is a GCC extension. 562413d355e38755a71f106dbc0ac900ca989070916Chris Lattner PP.Diag(TokLoc, diag::ext_binary_literal); 563368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner ++s; 564368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 2; 565368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner DigitsBegin = s; 566368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipBinaryDigits(s); 567368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (s == ThisTokEnd) { 568368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // Done. 569368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else if (isxdigit(*s)) { 570ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), 5715f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner diag::err_invalid_binary_digit) << StringRef(s, 1); 572ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 573368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 574413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // Other suffixes will be diagnosed by the caller. 575368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 576368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 5771eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 578368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // For now, the radix is set to 8. If we discover that we have a 579368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner // floating point constant, the radix will change to 10. Octal floating 5801eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // point constants are not permitted (only decimal and hexadecimal). 581368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 8; 582368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner DigitsBegin = s; 583368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = SkipOctalDigits(s); 584368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (s == ThisTokEnd) 585368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; // Done, simple octal number like 01234 5861eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 587413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // If we have some other non-octal digit that *is* a decimal digit, see if 588413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // this is part of a floating point number like 094.123 or 09e1. 589413d355e38755a71f106dbc0ac900ca989070916Chris Lattner if (isdigit(*s)) { 590413d355e38755a71f106dbc0ac900ca989070916Chris Lattner const char *EndDecimal = SkipDigits(s); 591413d355e38755a71f106dbc0ac900ca989070916Chris Lattner if (EndDecimal[0] == '.' || EndDecimal[0] == 'e' || EndDecimal[0] == 'E') { 592413d355e38755a71f106dbc0ac900ca989070916Chris Lattner s = EndDecimal; 593413d355e38755a71f106dbc0ac900ca989070916Chris Lattner radix = 10; 594413d355e38755a71f106dbc0ac900ca989070916Chris Lattner } 595413d355e38755a71f106dbc0ac900ca989070916Chris Lattner } 5961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 597413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // If we have a hex digit other than 'e' (which denotes a FP exponent) then 598413d355e38755a71f106dbc0ac900ca989070916Chris Lattner // the code is using an incorrect base. 599368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (isxdigit(*s) && *s != 'e' && *s != 'E') { 600ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, s-ThisTokBegin), 6015f9e272e632e951b1efe824cd16acb4d96077930Chris Lattner diag::err_invalid_octal_digit) << StringRef(s, 1); 602ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 603368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 604368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 6051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 606368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == '.') { 607368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 608368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 10; 609368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_period = true; 610413d355e38755a71f106dbc0ac900ca989070916Chris Lattner s = SkipDigits(s); // Skip suffix. 611368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 612368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == 'e' || *s == 'E') { // exponent 613368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *Exponent = s; 614368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s++; 615368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner radix = 10; 616368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner saw_exponent = true; 617368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (*s == '+' || *s == '-') s++; // sign 618368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner const char *first_non_digit = SkipDigits(s); 619368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner if (first_non_digit != s) { 620368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner s = first_non_digit; 621368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } else { 6221eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump PP.Diag(PP.AdvanceToTokenCharacter(TokLoc, Exponent-ThisTokBegin), 623ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner diag::err_exponent_has_no_digits); 624ac92d829111bc19d1cc97cd85c3c04bc39b969d1Chris Lattner hadError = true; 625368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner return; 626368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 627368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner } 628368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner} 629368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner 630368328c88bd46f471bbf85f05438b4f2eb95df5bChris Lattner 6315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// GetIntegerValue - Convert this numeric literal value to an APInt that 6325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// matches Val's input width. If there is an overflow, set Val to the low bits 6335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// of the result and return true. Otherwise, return false. 6345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencerbool NumericLiteralParser::GetIntegerValue(llvm::APInt &Val) { 635a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // Fast path: Compute a conservative bound on the maximum number of 636a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // bits per digit in this radix. If we can't possibly overflow a 637a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // uint64 based on that bound then do the simple conversion to 638a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // integer. This avoids the expensive overflow checking below, and 639a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // handles the common cases that matter (small decimal integers and 640a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // hex/octal values which don't overflow). 641a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar unsigned MaxBitsPerDigit = 1; 6421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump while ((1U << MaxBitsPerDigit) < radix) 643a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar MaxBitsPerDigit += 1; 644a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar if ((SuffixBegin - DigitsBegin) * MaxBitsPerDigit <= 64) { 645a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar uint64_t N = 0; 646a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar for (s = DigitsBegin; s != SuffixBegin; ++s) 647a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar N = N*radix + HexDigitValue(*s); 648a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar 649a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // This will truncate the value to Val's input width. Simply check 650a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar // for overflow by comparing. 651a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar Val = N; 652a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar return Val.getZExtValue() != N; 653a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar } 654a179be34c1a3c0190e6b9e39dee2197651f44a5dDaniel Dunbar 6555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val = 0; 6565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer s = DigitsBegin; 6575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APInt RadixVal(Val.getBitWidth(), radix); 6595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APInt CharVal(Val.getBitWidth(), 0); 6605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::APInt OldVal = Val; 6611eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer bool OverflowOccurred = false; 6635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer while (s < SuffixBegin) { 6645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned C = HexDigitValue(*s++); 6651eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this letter is out of bound for this radix, reject it. 6675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(C < radix && "NumericLiteralParser ctor should have rejected this"); 6681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer CharVal = C; 6701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Add the digit to the value in the appropriate radix. If adding in digits 6725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // made the value smaller, then this overflowed. 6735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer OldVal = Val; 6745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Multiply by radix, did overflow occur on the multiply? 6765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val *= RadixVal; 6775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer OverflowOccurred |= Val.udiv(RadixVal) != OldVal; 6785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6795f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Add value, did overflow occur on the value? 680d70cb645702bdbb42aee58403306a7c47e0d901cDaniel Dunbar // (a + b) ult b <=> overflow 6815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Val += CharVal; 6825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer OverflowOccurred |= Val.ult(CharVal); 6835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 6845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer return OverflowOccurred; 6855f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 68794c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCallllvm::APFloat::opStatus 68894c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCallNumericLiteralParser::GetFloatValue(llvm::APFloat &Result) { 689427d5af5b601985093b6b4b33ba1e30fc24d86dcTed Kremenek using llvm::APFloat; 6901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 691e9f195f15ffe96d0a220c872ab12d0630a633c44Erick Tryzelaar unsigned n = std::min(SuffixBegin - ThisTokBegin, ThisTokEnd - ThisTokBegin); 69294c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCall return Result.convertFromString(StringRef(ThisTokBegin, n), 69394c939dc1d4958b62ea5a89294dd8b2905f3191fJohn McCall APFloat::rmNearestTiesToEven); 6945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 6955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 6975f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerCharLiteralParser::CharLiteralParser(const char *begin, const char *end, 6985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SourceLocation Loc, Preprocessor &PP) { 6995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // At this point we know that the character matches the regex "L?'.*'". 7005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer HadError = false; 7011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Determine if this is a wide character. 7035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer IsWide = begin[0] == 'L'; 7045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (IsWide) ++begin; 7051eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Skip over the entry quote. 7075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(begin[0] == '\'' && "Invalid token lexed"); 7085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++begin; 7095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // FIXME: The "Value" is an uint64_t so we can handle char literals of 711fc8f0e14ad142ed811e90fbd9a30e419e301c717Chris Lattner // up to 64-bits. 7125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // FIXME: This extensively assumes that 'char' is 8-bits. 71398be4943e8dc4f3905629a7102668960873cf863Chris Lattner assert(PP.getTargetInfo().getCharWidth() == 8 && 7145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer "Assumes char is 8 bits"); 715e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner assert(PP.getTargetInfo().getIntWidth() <= 64 && 716e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner (PP.getTargetInfo().getIntWidth() & 7) == 0 && 717e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner "Assumes sizeof(int) on target is <= 64 and a multiple of char"); 718e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner assert(PP.getTargetInfo().getWCharWidth() <= 64 && 719e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner "Assumes sizeof(wchar) on target is <= 64"); 7204bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta 7211eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump // This is what we will use for overflow detection 7224bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta llvm::APInt LitVal(PP.getTargetInfo().getIntWidth(), 0); 7231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 724e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner unsigned NumCharsSoFar = 0; 7251c6c64b5181a960c7d4cace4995a938d4dfa6fbfChris Lattner bool Warned = false; 7265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer while (begin[0] != '\'') { 7274bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta uint64_t ResultChar; 72859705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber 72959705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber // Is this a Universal Character Name escape? 7305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (begin[0] != '\\') // If this is a normal character, consume it. 7315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultChar = *begin++; 73259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber else { // Otherwise, this is an escape character. 73359705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber // Check for UCN. 73459705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber if (begin[1] == 'u' || begin[1] == 'U') { 73559705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber uint32_t utf32 = 0; 73659705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber unsigned short UcnLen = 0; 737872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner if (!ProcessUCNEscape(begin, end, utf32, UcnLen, 738872a45e91778eb0b706ff57272fe547d4512eb19Chris Lattner FullSourceLoc(Loc, PP.getSourceManager()), 7396c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner &PP.getDiagnostics(), PP.getLangOptions())) { 74059705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber HadError = 1; 74159705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber } 74259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber ResultChar = utf32; 74359705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber } else { 74459705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber // Otherwise, this is a non-UCN escape character. Process it. 74591f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner ResultChar = ProcessCharEscape(begin, end, HadError, 74691f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner FullSourceLoc(Loc,PP.getSourceManager()), 74791f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner IsWide, 74891f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner &PP.getDiagnostics(), PP.getTargetInfo()); 74959705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber } 75059705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber } 7515f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 7525f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is a multi-character constant (e.g. 'abc'), handle it. These are 7535f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // implementation defined (C99 6.4.4.4p10). 754e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner if (NumCharsSoFar) { 7555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (IsWide) { 7565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Emulate GCC's (unintentional?) behavior: L'ab' -> L'b'. 7574bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta LitVal = 0; 7585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 7595f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Narrow character literals act as though their value is concatenated 760e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner // in this implementation, but warn on overflow. 7611c6c64b5181a960c7d4cace4995a938d4dfa6fbfChris Lattner if (LitVal.countLeadingZeros() < 8 && !Warned) { 7625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer PP.Diag(Loc, diag::warn_char_constant_too_large); 7631c6c64b5181a960c7d4cace4995a938d4dfa6fbfChris Lattner Warned = true; 7641c6c64b5181a960c7d4cace4995a938d4dfa6fbfChris Lattner } 7654bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta LitVal <<= 8; 7665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 7681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 7694bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta LitVal = LitVal + ResultChar; 770e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner ++NumCharsSoFar; 771e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner } 772e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner 773e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner // If this is the second character being processed, do special handling. 774e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner if (NumCharsSoFar > 1) { 775e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner // Warn about discarding the top bits for multi-char wide-character 776e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner // constants (L'abcd'). 777e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner if (IsWide) 778e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner PP.Diag(Loc, diag::warn_extraneous_wide_char_constant); 779e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner else if (NumCharsSoFar != 4) 780e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner PP.Diag(Loc, diag::ext_multichar_character_literal); 781e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner else 782e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner PP.Diag(Loc, diag::ext_four_char_character_literal); 7832a1c363f38e59a5044fc349aa7e538a50954c244Eli Friedman IsMultiChar = true; 784930b71a4a7dedf70a73e5fd875bae7df452b80a9Daniel Dunbar } else 785930b71a4a7dedf70a73e5fd875bae7df452b80a9Daniel Dunbar IsMultiChar = false; 7864bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta 7874bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta // Transfer the value from APInt to uint64_t 7884bc11af9bed1d4a247e3db1fcb754d410ad99099Sanjiv Gupta Value = LitVal.getZExtValue(); 7891eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 79059705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber if (IsWide && PP.getLangOptions().ShortWChar && Value > 0xFFFF) 79159705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber PP.Diag(Loc, diag::warn_ucn_escape_too_large); 79259705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber 7935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // If this is a single narrow character, sign extend it (e.g. '\xFF' is "-1") 7945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // if 'char' is signed for this target (C99 6.4.4.4p10). Note that multiple 7955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // character constants are not sign extended in the this implementation: 7965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // '\xFF\xFF' = 65536 and '\x0\xFF' = 255, which matches GCC. 797e3ad881e4e9620e941dabd4e78dacdb028b85682Chris Lattner if (!IsWide && NumCharsSoFar == 1 && (Value & 128) && 79815b91764d08e886391c865c4a444d7b51141c284Eli Friedman PP.getLangOptions().CharIsSigned) 7995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer Value = (signed char)Value; 8005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 8015f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// string-literal: [C99 6.4.5] 8045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// " [s-char-sequence] " 8055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// L" [s-char-sequence] " 8065f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char-sequence: 8075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char 8085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char-sequence s-char 8095f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// s-char: 8105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// any source character except the double quote ", 8115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// backslash \, or newline character 8125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// escape-character 8135f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// universal-character-name 8145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// escape-character: [C99 6.4.4.4] 8155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// \ escape-code 8165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// universal-character-name 8175f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// escape-code: 8185f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// character-escape-code 8195f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-escape-code 8205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hex-escape-code 8215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// character-escape-code: one of 8225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// n t b r f v a 8235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// \ ' " ? 8245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-escape-code: 8255f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-digit 8265f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-digit octal-digit 8275f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// octal-digit octal-digit octal-digit 8285f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hex-escape-code: 8295f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// x hex-digit 8305f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hex-escape-code hex-digit 8315f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// universal-character-name: 8325f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// \u hex-quad 8335f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// \U hex-quad hex-quad 8345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hex-quad: 8355f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// hex-digit hex-digit hex-digit hex-digit 8365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer/// 8375f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid SpencerStringLiteralParser:: 838d217773f106856a11879ec79dc468efefaf2ee75Chris LattnerStringLiteralParser(const Token *StringToks, unsigned NumStringToks, 8390833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner Preprocessor &PP, bool Complain) 8400833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner : SM(PP.getSourceManager()), Features(PP.getLangOptions()), 841403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis Target(PP.getTargetInfo()), Diags(Complain ? &PP.getDiagnostics() : 0), 842403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis MaxTokenLength(0), SizeBound(0), wchar_tByteWidth(0), 843403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis ResultPtr(ResultBuf.data()), hadError(false), AnyWide(false), Pascal(false) { 8440833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner init(StringToks, NumStringToks); 8450833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner} 8460833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner 8470833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattnervoid StringLiteralParser::init(const Token *StringToks, unsigned NumStringToks){ 848403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis // The literal token may have come from an invalid source location (e.g. due 849403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis // to a PCH error), in which case the token length will be 0. 850403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis if (NumStringToks == 0 || StringToks[0].getLength() < 2) { 851403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis hadError = true; 852403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis return; 853403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis } 854403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis 8555f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Scan all of the string portions, remember the max individual token length, 8565f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // computing a bound on the concatenated string length, and see whether any 8575f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // piece is a wide-string. If any of the string portions is a wide-string 8585f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // literal, the result is a wide-string literal [C99 6.4.5p4]. 859403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis assert(NumStringToks && "expected at least one token"); 8606cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt MaxTokenLength = StringToks[0].getLength(); 861403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis assert(StringToks[0].getLength() >= 2 && "literal token is invalid!"); 8626cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt SizeBound = StringToks[0].getLength()-2; // -2 for "". 86322f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner AnyWide = StringToks[0].is(tok::wide_string_literal); 8646cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt 8656cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt hadError = false; 8665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer 8675f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Implement Translation Phase #6: concatenation of string literals 8685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer /// (C99 5.1.1.2p1). The common case is only one string fragment. 8695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 1; i != NumStringToks; ++i) { 870403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis if (StringToks[i].getLength() < 2) { 871403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis hadError = true; 872403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis return; 873403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis } 874403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis 8755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // The string could be shorter than this if it needs cleaning, but this is a 8765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // reasonable bound, which is all we need. 877403de3f932b5d1d3e4e58f69960000911d04dd2aArgyrios Kyrtzidis assert(StringToks[i].getLength() >= 2 && "literal token is invalid!"); 8786cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt SizeBound += StringToks[i].getLength()-2; // -2 for "". 8791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remember maximum string piece length. 8816cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt if (StringToks[i].getLength() > MaxTokenLength) 8826cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt MaxTokenLength = StringToks[i].getLength(); 8831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8845f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Remember if we see any wide strings. 88522f6bbcafa8871f4f20c4402d9cbc5c024fee99aChris Lattner AnyWide |= StringToks[i].is(tok::wide_string_literal); 8865f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 887dbb1ecc32ca122b07b7c98fd0a8f6f53985adaccChris Lattner 8885f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Include space for the null terminator. 8895f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++SizeBound; 8901eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8915f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // TODO: K&R warning: "traditional C rejects string constant concatenation" 8921eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8935f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Get the width in bytes of wchar_t. If no wchar_t strings are used, do not 8945f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // query the target. As such, wchar_tByteWidth is only valid if AnyWide=true. 8955f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer wchar_tByteWidth = ~0U; 8965f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (AnyWide) { 897a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner wchar_tByteWidth = Target.getWCharWidth(); 8985f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert((wchar_tByteWidth & 7) == 0 && "Assumes wchar_t is byte multiple!"); 8995f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer wchar_tByteWidth /= 8; 9005f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9011eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9025f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // The output buffer size needs to be large enough to hold wide characters. 9035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // This is a worst-case assumption which basically corresponds to L"" "long". 9045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (AnyWide) 9055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer SizeBound *= wchar_tByteWidth; 9061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9075f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Size the temporary buffer to hold the result string data. 9085f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultBuf.resize(SizeBound); 9091eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9105f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Likewise, but for each string piece. 9115f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer llvm::SmallString<512> TokenBuf; 9125f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer TokenBuf.resize(MaxTokenLength); 9131eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9145f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Loop over all the strings, getting their spelling, and expanding them to 9155f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // wide strings as appropriate. 9165f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultPtr = &ResultBuf[0]; // Next byte to fill in. 9171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 918ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson Pascal = false; 9191eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9205f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 0, e = NumStringToks; i != e; ++i) { 9215f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *ThisTokBuf = &TokenBuf[0]; 9225f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Get the spelling of the token, which eliminates trigraphs, etc. We know 9235f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // that ThisTokBuf points to a buffer that is big enough for the whole token 9245f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // and 'spelled' tokens can only shrink. 92550f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor bool StringInvalid = false; 9260833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner unsigned ThisTokLen = 927b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner Lexer::getSpelling(StringToks[i], ThisTokBuf, SM, Features, 928b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner &StringInvalid); 92950f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor if (StringInvalid) { 93050f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor hadError = 1; 93150f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor continue; 93250f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor } 93350f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor 9345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *ThisTokEnd = ThisTokBuf+ThisTokLen-1; // Skip end quote. 93556bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian bool wide = false; 9365f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // TODO: Input character set mapping support. 9371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9385f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Skip L marker for wide strings. 93956bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian if (ThisTokBuf[0] == 'L') { 94056bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian wide = true; 9415f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 94256bedefe92ae8f604d14bea75cc3040ab32337c2Fariborz Jahanian } 9431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9445f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer assert(ThisTokBuf[0] == '"' && "Expected quote, lexer broken?"); 9455f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 9461eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 947ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson // Check if this is a pascal string 948a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner if (Features.PascalStrings && ThisTokBuf + 1 != ThisTokEnd && 949ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson ThisTokBuf[0] == '\\' && ThisTokBuf[1] == 'p') { 9501eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 951ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson // If the \p sequence is found in the first token, we have a pascal string 952ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson // Otherwise, if we already have a pascal string, ignore the first \p 953ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson if (i == 0) { 954ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson ++ThisTokBuf; 955ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson Pascal = true; 956ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson } else if (Pascal) 957ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson ThisTokBuf += 2; 958ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson } 9591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9605f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer while (ThisTokBuf != ThisTokEnd) { 9615f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Is this a span of non-escape characters? 9625f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (ThisTokBuf[0] != '\\') { 9635f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer const char *InStart = ThisTokBuf; 9645f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer do { 9655f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ++ThisTokBuf; 9665f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } while (ThisTokBuf != ThisTokEnd && ThisTokBuf[0] != '\\'); 9671eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9685f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Copy the character span over. 9695f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer unsigned Len = ThisTokBuf-InStart; 9705f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer if (!AnyWide) { 9715f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer memcpy(ResultPtr, InStart, Len); 9725f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer ResultPtr += Len; 9735f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } else { 9745f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Note: our internal rep of wide char tokens is always little-endian. 9755f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (; Len; --Len, ++InStart) { 9765f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer *ResultPtr++ = InStart[0]; 9775f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer // Add zeros at the end. 9785f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer for (unsigned i = 1, e = wchar_tByteWidth; i != e; ++i) 9790e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff *ResultPtr++ = 0; 9805f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9815f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9825f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer continue; 9835f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 9844e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff // Is this a Universal Character Name escape? 9850e3e3eb3879d5a7aaca4a393706149ddef8544f1Steve Naroff if (ThisTokBuf[1] == 'u' || ThisTokBuf[1] == 'U') { 98659705aee3fe01aa6fb6962dd11350161b47983d9Nico Weber EncodeUCNEscape(ThisTokBuf, ThisTokEnd, ResultPtr, 987a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner hadError, FullSourceLoc(StringToks[i].getLocation(),SM), 988a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner wide, Diags, Features); 9894e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff continue; 9904e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff } 9914e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff // Otherwise, this is a non-UCN escape character. Process it. 99291f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner unsigned ResultChar = 99391f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner ProcessCharEscape(ThisTokBuf, ThisTokEnd, hadError, 9946c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner FullSourceLoc(StringToks[i].getLocation(), SM), 9956c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner AnyWide, Diags, Target); 9961eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 9974e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff // Note: our internal rep of wide char tokens is always little-endian. 9984e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff *ResultPtr++ = ResultChar & 0xFF; 9991eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 10004e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff if (AnyWide) { 10014e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff for (unsigned i = 1, e = wchar_tByteWidth; i != e; ++i) 10024e93b34fdb798abfa0534062a139f2c37cbf876eSteve Naroff *ResultPtr++ = ResultChar >> i*8; 10035f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10045f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10055f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer } 10061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1007bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner if (Pascal) { 1008ee98ac5a1330db432b188dd2d38b6631aac47bf1Anders Carlsson ResultBuf[0] = ResultPtr-&ResultBuf[0]-1; 100964a8034226e6529a7ba65c005c846a70e17a1664Fariborz Jahanian if (AnyWide) 101064a8034226e6529a7ba65c005c846a70e17a1664Fariborz Jahanian ResultBuf[0] /= wchar_tByteWidth; 1011bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner 1012bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner // Verify that pascal strings aren't too large. 10130833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner if (GetStringLength() > 256) { 10140833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner if (Diags) 10150833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner Diags->Report(FullSourceLoc(StringToks[0].getLocation(), SM), 10160833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner diag::err_pascal_string_too_long) 10170833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner << SourceRange(StringToks[0].getLocation(), 10180833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner StringToks[NumStringToks-1].getLocation()); 101957d7dde770c67b282e7fb77b1b81e429910937b3Eli Friedman hadError = 1; 102057d7dde770c67b282e7fb77b1b81e429910937b3Eli Friedman return; 102157d7dde770c67b282e7fb77b1b81e429910937b3Eli Friedman } 10220833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner } else if (Diags) { 1023427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor // Complain if this string literal has too many characters. 1024a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner unsigned MaxChars = Features.CPlusPlus? 65536 : Features.C99 ? 4095 : 509; 1025427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor 1026427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor if (GetNumStringChars() > MaxChars) 10270833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner Diags->Report(FullSourceLoc(StringToks[0].getLocation(), SM), 10280833dd0675c25cbb35671c7a2006d511d5c77ce3Chris Lattner diag::ext_string_too_long) 1029427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor << GetNumStringChars() << MaxChars 1030a95880d6513c617bb96634bcc1f16c6bdb80dedcChris Lattner << (Features.CPlusPlus ? 2 : Features.C99 ? 1 : 0) 1031427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor << SourceRange(StringToks[0].getLocation(), 1032427c492d368d6ecf409fa8053eecb5cd0e779c5bDouglas Gregor StringToks[NumStringToks-1].getLocation()); 1033bbee00b6456e90a09f63c83c20233e6c5ad6000aChris Lattner } 10345f016e2cb5d11daeb237544de1c5d59f20fe1a6eReid Spencer} 1035719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1036719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1037719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner/// getOffsetOfStringByte - This function returns the offset of the 1038719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner/// specified byte of the string data represented by Token. This handles 1039719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner/// advancing over escape sequences in the string. 1040719e61573f27c11057ecfe0dd8f141621602c571Chris Lattnerunsigned StringLiteralParser::getOffsetOfStringByte(const Token &Tok, 10416c66f07854c1334a1ce9eae1428d61d54182a6e1Chris Lattner unsigned ByteNo) const { 1042719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Get the spelling of the token. 1043ca1475ea0e76da6b852796610139ed9b49c8d4a6Chris Lattner llvm::SmallString<32> SpellingBuffer; 10446cf750298d3621d8a10a6dd07fcee8e274b9d94dSean Hunt SpellingBuffer.resize(Tok.getLength()); 10451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 104650f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor bool StringInvalid = false; 1047719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner const char *SpellingPtr = &SpellingBuffer[0]; 1048b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner unsigned TokLen = Lexer::getSpelling(Tok, SpellingPtr, SM, Features, 1049b0607279cb98bbf2bbfe0db170aed39ef91e86a2Chris Lattner &StringInvalid); 105091f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner if (StringInvalid) 105150f6af7a6d6951a63f3da7d4c5a7d3965bf73b63Douglas Gregor return 0; 1052719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1053719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(SpellingPtr[0] != 'L' && "Doesn't handle wide strings yet"); 1054719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 10551eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1056719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner const char *SpellingStart = SpellingPtr; 1057719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner const char *SpellingEnd = SpellingPtr+TokLen; 1058719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner 1059719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Skip over the leading quote. 1060719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(SpellingPtr[0] == '"' && "Should be a string literal!"); 1061719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner ++SpellingPtr; 10621eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1063719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Skip over bytes until we find the offset we're looking for. 1064719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner while (ByteNo) { 1065719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(SpellingPtr < SpellingEnd && "Didn't find byte offset!"); 10661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1067719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Step over non-escapes simply. 1068719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner if (*SpellingPtr != '\\') { 1069719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner ++SpellingPtr; 1070719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner --ByteNo; 1071719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner continue; 1072719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner } 10731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1074719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner // Otherwise, this is an escape character. Advance over it. 1075719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner bool HadError = false; 1076719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner ProcessCharEscape(SpellingPtr, SpellingEnd, HadError, 1077ca1475ea0e76da6b852796610139ed9b49c8d4a6Chris Lattner FullSourceLoc(Tok.getLocation(), SM), 107891f54ce93bec136fb9e18740b895cf1c1339524bChris Lattner false, Diags, Target); 1079719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner assert(!HadError && "This method isn't valid on erroneous strings"); 1080719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner --ByteNo; 1081719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner } 10821eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1083719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner return SpellingPtr-SpellingStart; 1084719e61573f27c11057ecfe0dd8f141621602c571Chris Lattner} 1085