1d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner//===--- TokenConcatenation.cpp - Token Concatenation Avoidance -----------===// 2d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner// 3d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner// The LLVM Compiler Infrastructure 4d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner// 5d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner// This file is distributed under the University of Illinois Open Source 6d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner// License. See LICENSE.TXT for details. 7d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner// 8d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner//===----------------------------------------------------------------------===// 9d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner// 10d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner// This file implements the TokenConcatenation class. 11d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner// 12d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner//===----------------------------------------------------------------------===// 13d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner 14d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner#include "clang/Lex/TokenConcatenation.h" 154a04d445af4d29440371800409babc98708d98aaJordan Rose#include "clang/Basic/CharInfo.h" 16d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner#include "clang/Lex/Preprocessor.h" 17c4bf2b9afb7d47445a9dc6bc848657098a4e3851Abramo Bagnara#include "llvm/Support/ErrorHandling.h" 181eb4433ac451dc16f4133a88af2d002ac26c58efMike Stumpusing namespace clang; 19d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner 20d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner 212fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// IsStringPrefix - Return true if Str is a string prefix. 222fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// 'L', 'u', 'U', or 'u8'. Including raw versions. 2380ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smithstatic bool IsStringPrefix(StringRef Str, bool CPlusPlus11) { 242fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 252fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (Str[0] == 'L' || 2680ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith (CPlusPlus11 && (Str[0] == 'u' || Str[0] == 'U' || Str[0] == 'R'))) { 272fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 282fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (Str.size() == 1) 292fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper return true; // "L", "u", "U", and "R" 302fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 312fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Check for raw flavors. Need to make sure the first character wasn't 3280ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith // already R. Need CPlusPlus11 check for "LR". 3380ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (Str[1] == 'R' && Str[0] != 'R' && Str.size() == 2 && CPlusPlus11) 342fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper return true; // "LR", "uR", "UR" 352fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 362fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper // Check for "u8" and "u8R" 372fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (Str[0] == 'u' && Str[1] == '8') { 382fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (Str.size() == 2) return true; // "u8" 392fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (Str.size() == 3 && Str[2] == 'R') return true; // "u8R" 402fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } 412fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper } 422fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 432fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper return false; 442fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper} 452fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper 465cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor/// IsIdentifierStringPrefix - Return true if the spelling of the token 472fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper/// is literally 'L', 'u', 'U', or 'u8'. Including raw versions. 485cee1195584fa8672253139c86e922daeda69b9eDouglas Gregorbool TokenConcatenation::IsIdentifierStringPrefix(const Token &Tok) const { 494e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie const LangOptions &LangOpts = PP.getLangOpts(); 50d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner 51d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner if (!Tok.needsCleaning()) { 522fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper if (Tok.getLength() < 1 || Tok.getLength() > 3) 53d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return false; 54d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner SourceManager &SM = PP.getSourceManager(); 555cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor const char *Ptr = SM.getCharacterData(SM.getSpellingLoc(Tok.getLocation())); 562fa4e86b4fdada3b9ecbbbd99965b83ed879f69bCraig Topper return IsStringPrefix(StringRef(Ptr, Tok.getLength()), 5780ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith LangOpts.CPlusPlus11); 58d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner } 591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 60d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner if (Tok.getLength() < 256) { 61d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner char Buffer[256]; 62d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner const char *TokPtr = Buffer; 635cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor unsigned length = PP.getSpelling(Tok, TokPtr); 6480ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith return IsStringPrefix(StringRef(TokPtr, length), LangOpts.CPlusPlus11); 65d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner } 661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 6780ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith return IsStringPrefix(StringRef(PP.getSpelling(Tok)), LangOpts.CPlusPlus11); 68d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner} 69d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner 70d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris LattnerTokenConcatenation::TokenConcatenation(Preprocessor &pp) : PP(pp) { 71d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner memset(TokenInfo, 0, sizeof(TokenInfo)); 721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 73d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // These tokens have custom code in AvoidConcat. 74d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::identifier ] |= aci_custom; 75d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::numeric_constant] |= aci_custom_firstchar; 76d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::period ] |= aci_custom_firstchar; 77d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::amp ] |= aci_custom_firstchar; 78d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::plus ] |= aci_custom_firstchar; 79d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::minus ] |= aci_custom_firstchar; 80d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::slash ] |= aci_custom_firstchar; 81d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::less ] |= aci_custom_firstchar; 82d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::greater ] |= aci_custom_firstchar; 83d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::pipe ] |= aci_custom_firstchar; 84d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::percent ] |= aci_custom_firstchar; 85d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::colon ] |= aci_custom_firstchar; 86d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::hash ] |= aci_custom_firstchar; 87d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::arrow ] |= aci_custom_firstchar; 881eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 8999831e4677a7e2e051af636221694d60ba31fcdbRichard Smith // These tokens have custom code in C++11 mode. 9080ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (PP.getLangOpts().CPlusPlus11) { 9199831e4677a7e2e051af636221694d60ba31fcdbRichard Smith TokenInfo[tok::string_literal ] |= aci_custom; 9299831e4677a7e2e051af636221694d60ba31fcdbRichard Smith TokenInfo[tok::wide_string_literal ] |= aci_custom; 9399831e4677a7e2e051af636221694d60ba31fcdbRichard Smith TokenInfo[tok::utf8_string_literal ] |= aci_custom; 9499831e4677a7e2e051af636221694d60ba31fcdbRichard Smith TokenInfo[tok::utf16_string_literal] |= aci_custom; 9599831e4677a7e2e051af636221694d60ba31fcdbRichard Smith TokenInfo[tok::utf32_string_literal] |= aci_custom; 9699831e4677a7e2e051af636221694d60ba31fcdbRichard Smith TokenInfo[tok::char_constant ] |= aci_custom; 9799831e4677a7e2e051af636221694d60ba31fcdbRichard Smith TokenInfo[tok::wide_char_constant ] |= aci_custom; 9899831e4677a7e2e051af636221694d60ba31fcdbRichard Smith TokenInfo[tok::utf16_char_constant ] |= aci_custom; 9999831e4677a7e2e051af636221694d60ba31fcdbRichard Smith TokenInfo[tok::utf32_char_constant ] |= aci_custom; 10099831e4677a7e2e051af636221694d60ba31fcdbRichard Smith } 10199831e4677a7e2e051af636221694d60ba31fcdbRichard Smith 102d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // These tokens change behavior if followed by an '='. 103d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::amp ] |= aci_avoid_equal; // &= 104d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::plus ] |= aci_avoid_equal; // += 105d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::minus ] |= aci_avoid_equal; // -= 106d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::slash ] |= aci_avoid_equal; // /= 107d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::less ] |= aci_avoid_equal; // <= 108d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::greater ] |= aci_avoid_equal; // >= 109d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::pipe ] |= aci_avoid_equal; // |= 110d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::percent ] |= aci_avoid_equal; // %= 111d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::star ] |= aci_avoid_equal; // *= 112d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::exclaim ] |= aci_avoid_equal; // != 113d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::lessless ] |= aci_avoid_equal; // <<= 11486851109b8f70eee7a743bc914219e4f0d8bf9f4Chris Lattner TokenInfo[tok::greatergreater] |= aci_avoid_equal; // >>= 115d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::caret ] |= aci_avoid_equal; // ^= 116d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner TokenInfo[tok::equal ] |= aci_avoid_equal; // == 117d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner} 118d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner 11999c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar/// GetFirstChar - Get the first character of the token \arg Tok, 12099c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar/// avoiding calls to getSpelling where possible. 12199c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbarstatic char GetFirstChar(Preprocessor &PP, const Token &Tok) { 12299c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar if (IdentifierInfo *II = Tok.getIdentifierInfo()) { 12399c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar // Avoid spelling identifiers, the most common form of token. 124e013d685c6689ac7ae103ee88acf573422d1ed6aDaniel Dunbar return II->getNameStart()[0]; 12599c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar } else if (!Tok.needsCleaning()) { 12699c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar if (Tok.isLiteral() && Tok.getLiteralData()) { 12799c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar return *Tok.getLiteralData(); 12899c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar } else { 12999c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar SourceManager &SM = PP.getSourceManager(); 13099c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar return *SM.getCharacterData(SM.getSpellingLoc(Tok.getLocation())); 13199c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar } 13299c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar } else if (Tok.getLength() < 256) { 13399c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar char Buffer[256]; 13499c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar const char *TokPtr = Buffer; 13599c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar PP.getSpelling(Tok, TokPtr); 13699c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar return TokPtr[0]; 13799c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar } else { 13899c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar return PP.getSpelling(Tok)[0]; 13999c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar } 14099c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar} 14199c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar 142d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// AvoidConcat - If printing PrevTok immediately followed by Tok would cause 143d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// the two individual tokens to be lexed as a single token, return true 144d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// (which causes a space to be printed between them). This allows the output 145d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// of -E mode to be lexed to the same token stream as lexing the input 146d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// directly would. 147d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// 148d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// This code must conservatively return true if it doesn't want to be 100% 149d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// accurate. This will cause the output to include extra space characters, 150d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// but the resulting output won't have incorrect concatenations going on. 151d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// Examples include "..", which we print with a space between, because we 152d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner/// don't want to track enough to tell "x.." from "...". 1538877321ca66b2887c2f377a7f724a62f34fdf1cdChris Lattnerbool TokenConcatenation::AvoidConcat(const Token &PrevPrevTok, 1548877321ca66b2887c2f377a7f724a62f34fdf1cdChris Lattner const Token &PrevTok, 155d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner const Token &Tok) const { 156e1614bb01cc429658b414a9e00603c66ae96d8f5Chris Lattner // First, check to see if the tokens were directly adjacent in the original 157e1614bb01cc429658b414a9e00603c66ae96d8f5Chris Lattner // source. If they were, it must be okay to stick them together: if there 158e1614bb01cc429658b414a9e00603c66ae96d8f5Chris Lattner // were an issue, the tokens would have been lexed differently. 159fcf896078e58aeb7adecb1a0ae5c8e0052b17f9fArgyrios Kyrtzidis SourceManager &SM = PP.getSourceManager(); 160fcf896078e58aeb7adecb1a0ae5c8e0052b17f9fArgyrios Kyrtzidis SourceLocation PrevSpellLoc = SM.getSpellingLoc(PrevTok.getLocation()); 161fcf896078e58aeb7adecb1a0ae5c8e0052b17f9fArgyrios Kyrtzidis SourceLocation SpellLoc = SM.getSpellingLoc(Tok.getLocation()); 162fcf896078e58aeb7adecb1a0ae5c8e0052b17f9fArgyrios Kyrtzidis if (PrevSpellLoc.getLocWithOffset(PrevTok.getLength()) == SpellLoc) 163e1614bb01cc429658b414a9e00603c66ae96d8f5Chris Lattner return false; 1641eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 165d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner tok::TokenKind PrevKind = PrevTok.getKind(); 166d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner if (PrevTok.getIdentifierInfo()) // Language keyword or named operator. 167d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner PrevKind = tok::identifier; 1681eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 169d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // Look up information on when we should avoid concatenation with prevtok. 170d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner unsigned ConcatInfo = TokenInfo[PrevKind]; 1711eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 172d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // If prevtok never causes a problem for anything after it, return quickly. 173d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner if (ConcatInfo == 0) return false; 1741eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 175d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner if (ConcatInfo & aci_avoid_equal) { 176d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // If the next token is '=' or '==', avoid concatenation. 177d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner if (Tok.is(tok::equal) || Tok.is(tok::equalequal)) 178d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return true; 179d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner ConcatInfo &= ~aci_avoid_equal; 180d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner } 1811eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 182d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner if (ConcatInfo == 0) return false; 1831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 184d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // Basic algorithm: we look at the first character of the second token, and 185d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // determine whether it, if appended to the first token, would form (or 186d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // would contribute) to a larger token if concatenated. 187d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner char FirstChar = 0; 188d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner if (ConcatInfo & aci_custom) { 189d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // If the token does not need to know the first character, don't get it. 190d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner } else { 19199c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar FirstChar = GetFirstChar(PP, Tok); 192d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner } 1931eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 194d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner switch (PrevKind) { 195c4bf2b9afb7d47445a9dc6bc848657098a4e3851Abramo Bagnara default: 196c4bf2b9afb7d47445a9dc6bc848657098a4e3851Abramo Bagnara llvm_unreachable("InitAvoidConcatTokenInfo built wrong"); 197c4bf2b9afb7d47445a9dc6bc848657098a4e3851Abramo Bagnara 198c4bf2b9afb7d47445a9dc6bc848657098a4e3851Abramo Bagnara case tok::raw_identifier: 199c4bf2b9afb7d47445a9dc6bc848657098a4e3851Abramo Bagnara llvm_unreachable("tok::raw_identifier in non-raw lexing mode!"); 200c4bf2b9afb7d47445a9dc6bc848657098a4e3851Abramo Bagnara 20199831e4677a7e2e051af636221694d60ba31fcdbRichard Smith case tok::string_literal: 20299831e4677a7e2e051af636221694d60ba31fcdbRichard Smith case tok::wide_string_literal: 20399831e4677a7e2e051af636221694d60ba31fcdbRichard Smith case tok::utf8_string_literal: 20499831e4677a7e2e051af636221694d60ba31fcdbRichard Smith case tok::utf16_string_literal: 20599831e4677a7e2e051af636221694d60ba31fcdbRichard Smith case tok::utf32_string_literal: 20699831e4677a7e2e051af636221694d60ba31fcdbRichard Smith case tok::char_constant: 20799831e4677a7e2e051af636221694d60ba31fcdbRichard Smith case tok::wide_char_constant: 20899831e4677a7e2e051af636221694d60ba31fcdbRichard Smith case tok::utf16_char_constant: 20999831e4677a7e2e051af636221694d60ba31fcdbRichard Smith case tok::utf32_char_constant: 21080ad52f327b532bded5c5b0ee38779d841c6cd35Richard Smith if (!PP.getLangOpts().CPlusPlus11) 21199831e4677a7e2e051af636221694d60ba31fcdbRichard Smith return false; 21299831e4677a7e2e051af636221694d60ba31fcdbRichard Smith 21399831e4677a7e2e051af636221694d60ba31fcdbRichard Smith // In C++11, a string or character literal followed by an identifier is a 21499831e4677a7e2e051af636221694d60ba31fcdbRichard Smith // single token. 21599831e4677a7e2e051af636221694d60ba31fcdbRichard Smith if (Tok.getIdentifierInfo()) 21699831e4677a7e2e051af636221694d60ba31fcdbRichard Smith return true; 21799831e4677a7e2e051af636221694d60ba31fcdbRichard Smith 21899831e4677a7e2e051af636221694d60ba31fcdbRichard Smith // A ud-suffix is an identifier. If the previous token ends with one, treat 21999831e4677a7e2e051af636221694d60ba31fcdbRichard Smith // it as an identifier. 22099831e4677a7e2e051af636221694d60ba31fcdbRichard Smith if (!PrevTok.hasUDSuffix()) 22199831e4677a7e2e051af636221694d60ba31fcdbRichard Smith return false; 22299831e4677a7e2e051af636221694d60ba31fcdbRichard Smith // FALL THROUGH. 2231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump case tok::identifier: // id+id or id+number or id+L"foo". 22499c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar // id+'.'... will not append. 22599c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar if (Tok.is(tok::numeric_constant)) 22699c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar return GetFirstChar(PP, Tok) != '.'; 22799c7622d1f673e8929196cc6eec7825a42622d5fDaniel Dunbar 2285cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor if (Tok.getIdentifierInfo() || Tok.is(tok::wide_string_literal) || 2295cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Tok.is(tok::utf8_string_literal) || Tok.is(tok::utf16_string_literal) || 2305cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Tok.is(tok::utf32_string_literal) || Tok.is(tok::wide_char_constant) || 2315cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor Tok.is(tok::utf16_char_constant) || Tok.is(tok::utf32_char_constant)) 232d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return true; 2331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 234d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // If this isn't identifier + string, we're done. 235d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner if (Tok.isNot(tok::char_constant) && Tok.isNot(tok::string_literal)) 236d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return false; 2371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 238d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner // Otherwise, this is a narrow character or string. If the *identifier* 2395cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor // is a literal 'L', 'u8', 'u' or 'U', avoid pasting L "foo" -> L"foo". 2405cee1195584fa8672253139c86e922daeda69b9eDouglas Gregor return IsIdentifierStringPrefix(PrevTok); 24199831e4677a7e2e051af636221694d60ba31fcdbRichard Smith 242d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::numeric_constant: 2434a04d445af4d29440371800409babc98708d98aaJordan Rose return isPreprocessingNumberBody(FirstChar) || 2444a04d445af4d29440371800409babc98708d98aaJordan Rose FirstChar == '+' || FirstChar == '-'; 245d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::period: // ..., .*, .1234 2468877321ca66b2887c2f377a7f724a62f34fdf1cdChris Lattner return (FirstChar == '.' && PrevPrevTok.is(tok::period)) || 2474a04d445af4d29440371800409babc98708d98aaJordan Rose isDigit(FirstChar) || 2484a04d445af4d29440371800409babc98708d98aaJordan Rose (PP.getLangOpts().CPlusPlus && FirstChar == '*'); 249d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::amp: // && 250d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return FirstChar == '&'; 251d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::plus: // ++ 252d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return FirstChar == '+'; 253d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::minus: // --, ->, ->* 254d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return FirstChar == '-' || FirstChar == '>'; 255d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::slash: //, /*, // 256d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return FirstChar == '*' || FirstChar == '/'; 257d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::less: // <<, <<=, <:, <% 258d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return FirstChar == '<' || FirstChar == ':' || FirstChar == '%'; 259d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::greater: // >>, >>= 260d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return FirstChar == '>'; 261d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::pipe: // || 262d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return FirstChar == '|'; 263d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::percent: // %>, %: 264896ccf83eb1a575d596fe757a9b259429ce7ab16Eli Friedman return FirstChar == '>' || FirstChar == ':'; 265d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::colon: // ::, :> 2668849f1190330c493a89b0088557d1a2333465847Eli Friedman return FirstChar == '>' || 2674e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie (PP.getLangOpts().CPlusPlus && FirstChar == ':'); 268d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::hash: // ##, #@, %:%: 269d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner return FirstChar == '#' || FirstChar == '@' || FirstChar == '%'; 270d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner case tok::arrow: // ->* 2714e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie return PP.getLangOpts().CPlusPlus && FirstChar == '*'; 272d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner } 273d7038e18ef540a78fe6ce2a43125ce9b08fdbbc5Chris Lattner} 274