Preprocessor.cpp revision 55817afdf9d453a443262a733f6caf6692dca118
1//===--- Preprocess.cpp - C Language Family Preprocessor Implementation ---===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the Preprocessor interface. 11// 12//===----------------------------------------------------------------------===// 13// 14// Options to support: 15// -H - Print the name of each header file used. 16// -d[DNI] - Dump various things. 17// -fworking-directory - #line's with preprocessor's working dir. 18// -fpreprocessed 19// -dependency-file,-M,-MM,-MF,-MG,-MP,-MT,-MQ,-MD,-MMD 20// -W* 21// -w 22// 23// Messages to emit: 24// "Multiple include guards may be useful for:\n" 25// 26//===----------------------------------------------------------------------===// 27 28#include "clang/Lex/Preprocessor.h" 29#include "MacroArgs.h" 30#include "clang/Lex/ExternalPreprocessorSource.h" 31#include "clang/Lex/HeaderSearch.h" 32#include "clang/Lex/MacroInfo.h" 33#include "clang/Lex/Pragma.h" 34#include "clang/Lex/PreprocessingRecord.h" 35#include "clang/Lex/ScratchBuffer.h" 36#include "clang/Lex/LexDiagnostic.h" 37#include "clang/Lex/CodeCompletionHandler.h" 38#include "clang/Basic/SourceManager.h" 39#include "clang/Basic/FileManager.h" 40#include "clang/Basic/TargetInfo.h" 41#include "llvm/ADT/APFloat.h" 42#include "llvm/ADT/SmallVector.h" 43#include "llvm/Support/MemoryBuffer.h" 44#include "llvm/Support/raw_ostream.h" 45using namespace clang; 46 47//===----------------------------------------------------------------------===// 48ExternalPreprocessorSource::~ExternalPreprocessorSource() { } 49 50Preprocessor::Preprocessor(Diagnostic &diags, const LangOptions &opts, 51 const TargetInfo &target, SourceManager &SM, 52 HeaderSearch &Headers, 53 IdentifierInfoLookup* IILookup, 54 bool OwnsHeaders) 55 : Diags(&diags), Features(opts), Target(target),FileMgr(Headers.getFileMgr()), 56 SourceMgr(SM), HeaderInfo(Headers), ExternalSource(0), 57 Identifiers(opts, IILookup), BuiltinInfo(Target), CodeComplete(0), 58 CodeCompletionFile(0), SkipMainFilePreamble(0, true), CurPPLexer(0), 59 CurDirLookup(0), Callbacks(0), MacroArgCache(0), Record(0) { 60 ScratchBuf = new ScratchBuffer(SourceMgr); 61 CounterValue = 0; // __COUNTER__ starts at 0. 62 OwnsHeaderSearch = OwnsHeaders; 63 64 // Clear stats. 65 NumDirectives = NumDefined = NumUndefined = NumPragma = 0; 66 NumIf = NumElse = NumEndif = 0; 67 NumEnteredSourceFiles = 0; 68 NumMacroExpanded = NumFnMacroExpanded = NumBuiltinMacroExpanded = 0; 69 NumFastMacroExpanded = NumTokenPaste = NumFastTokenPaste = 0; 70 MaxIncludeStackDepth = 0; 71 NumSkipped = 0; 72 73 // Default to discarding comments. 74 KeepComments = false; 75 KeepMacroComments = false; 76 77 // Macro expansion is enabled. 78 DisableMacroExpansion = false; 79 InMacroArgs = false; 80 NumCachedTokenLexers = 0; 81 82 CachedLexPos = 0; 83 84 // We haven't read anything from the external source. 85 ReadMacrosFromExternalSource = false; 86 87 // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro. 88 // This gets unpoisoned where it is allowed. 89 (Ident__VA_ARGS__ = getIdentifierInfo("__VA_ARGS__"))->setIsPoisoned(); 90 91 // Initialize the pragma handlers. 92 PragmaHandlers = new PragmaNamespace(llvm::StringRef()); 93 RegisterBuiltinPragmas(); 94 95 // Initialize builtin macros like __LINE__ and friends. 96 RegisterBuiltinMacros(); 97} 98 99Preprocessor::~Preprocessor() { 100 assert(BacktrackPositions.empty() && "EnableBacktrack/Backtrack imbalance!"); 101 102 while (!IncludeMacroStack.empty()) { 103 delete IncludeMacroStack.back().TheLexer; 104 delete IncludeMacroStack.back().TheTokenLexer; 105 IncludeMacroStack.pop_back(); 106 } 107 108 // Free any macro definitions. 109 for (llvm::DenseMap<IdentifierInfo*, MacroInfo*>::iterator I = 110 Macros.begin(), E = Macros.end(); I != E; ++I) { 111 // We don't need to free the MacroInfo objects directly. These 112 // will be released when the BumpPtrAllocator 'BP' object gets 113 // destroyed. We still need to run the dtor, however, to free 114 // memory alocated by MacroInfo. 115 I->second->Destroy(); 116 I->first->setHasMacroDefinition(false); 117 } 118 for (std::vector<MacroInfo*>::iterator I = MICache.begin(), 119 E = MICache.end(); I != E; ++I) { 120 // We don't need to free the MacroInfo objects directly. These 121 // will be released when the BumpPtrAllocator 'BP' object gets 122 // destroyed. We still need to run the dtor, however, to free 123 // memory alocated by MacroInfo. 124 (*I)->Destroy(); 125 } 126 127 // Free any cached macro expanders. 128 for (unsigned i = 0, e = NumCachedTokenLexers; i != e; ++i) 129 delete TokenLexerCache[i]; 130 131 // Free any cached MacroArgs. 132 for (MacroArgs *ArgList = MacroArgCache; ArgList; ) 133 ArgList = ArgList->deallocate(); 134 135 // Release pragma information. 136 delete PragmaHandlers; 137 138 // Delete the scratch buffer info. 139 delete ScratchBuf; 140 141 // Delete the header search info, if we own it. 142 if (OwnsHeaderSearch) 143 delete &HeaderInfo; 144 145 delete Callbacks; 146} 147 148void Preprocessor::setPTHManager(PTHManager* pm) { 149 PTH.reset(pm); 150 FileMgr.addStatCache(PTH->createStatCache()); 151} 152 153void Preprocessor::DumpToken(const Token &Tok, bool DumpFlags) const { 154 llvm::errs() << tok::getTokenName(Tok.getKind()) << " '" 155 << getSpelling(Tok) << "'"; 156 157 if (!DumpFlags) return; 158 159 llvm::errs() << "\t"; 160 if (Tok.isAtStartOfLine()) 161 llvm::errs() << " [StartOfLine]"; 162 if (Tok.hasLeadingSpace()) 163 llvm::errs() << " [LeadingSpace]"; 164 if (Tok.isExpandDisabled()) 165 llvm::errs() << " [ExpandDisabled]"; 166 if (Tok.needsCleaning()) { 167 const char *Start = SourceMgr.getCharacterData(Tok.getLocation()); 168 llvm::errs() << " [UnClean='" << llvm::StringRef(Start, Tok.getLength()) 169 << "']"; 170 } 171 172 llvm::errs() << "\tLoc=<"; 173 DumpLocation(Tok.getLocation()); 174 llvm::errs() << ">"; 175} 176 177void Preprocessor::DumpLocation(SourceLocation Loc) const { 178 Loc.dump(SourceMgr); 179} 180 181void Preprocessor::DumpMacro(const MacroInfo &MI) const { 182 llvm::errs() << "MACRO: "; 183 for (unsigned i = 0, e = MI.getNumTokens(); i != e; ++i) { 184 DumpToken(MI.getReplacementToken(i)); 185 llvm::errs() << " "; 186 } 187 llvm::errs() << "\n"; 188} 189 190void Preprocessor::PrintStats() { 191 llvm::errs() << "\n*** Preprocessor Stats:\n"; 192 llvm::errs() << NumDirectives << " directives found:\n"; 193 llvm::errs() << " " << NumDefined << " #define.\n"; 194 llvm::errs() << " " << NumUndefined << " #undef.\n"; 195 llvm::errs() << " #include/#include_next/#import:\n"; 196 llvm::errs() << " " << NumEnteredSourceFiles << " source files entered.\n"; 197 llvm::errs() << " " << MaxIncludeStackDepth << " max include stack depth\n"; 198 llvm::errs() << " " << NumIf << " #if/#ifndef/#ifdef.\n"; 199 llvm::errs() << " " << NumElse << " #else/#elif.\n"; 200 llvm::errs() << " " << NumEndif << " #endif.\n"; 201 llvm::errs() << " " << NumPragma << " #pragma.\n"; 202 llvm::errs() << NumSkipped << " #if/#ifndef#ifdef regions skipped\n"; 203 204 llvm::errs() << NumMacroExpanded << "/" << NumFnMacroExpanded << "/" 205 << NumBuiltinMacroExpanded << " obj/fn/builtin macros expanded, " 206 << NumFastMacroExpanded << " on the fast path.\n"; 207 llvm::errs() << (NumFastTokenPaste+NumTokenPaste) 208 << " token paste (##) operations performed, " 209 << NumFastTokenPaste << " on the fast path.\n"; 210} 211 212Preprocessor::macro_iterator 213Preprocessor::macro_begin(bool IncludeExternalMacros) const { 214 if (IncludeExternalMacros && ExternalSource && 215 !ReadMacrosFromExternalSource) { 216 ReadMacrosFromExternalSource = true; 217 ExternalSource->ReadDefinedMacros(); 218 } 219 220 return Macros.begin(); 221} 222 223Preprocessor::macro_iterator 224Preprocessor::macro_end(bool IncludeExternalMacros) const { 225 if (IncludeExternalMacros && ExternalSource && 226 !ReadMacrosFromExternalSource) { 227 ReadMacrosFromExternalSource = true; 228 ExternalSource->ReadDefinedMacros(); 229 } 230 231 return Macros.end(); 232} 233 234bool Preprocessor::SetCodeCompletionPoint(const FileEntry *File, 235 unsigned TruncateAtLine, 236 unsigned TruncateAtColumn) { 237 using llvm::MemoryBuffer; 238 239 CodeCompletionFile = File; 240 241 // Okay to clear out the code-completion point by passing NULL. 242 if (!CodeCompletionFile) 243 return false; 244 245 // Load the actual file's contents. 246 bool Invalid = false; 247 const MemoryBuffer *Buffer = SourceMgr.getMemoryBufferForFile(File, &Invalid); 248 if (Invalid) 249 return true; 250 251 // Find the byte position of the truncation point. 252 const char *Position = Buffer->getBufferStart(); 253 for (unsigned Line = 1; Line < TruncateAtLine; ++Line) { 254 for (; *Position; ++Position) { 255 if (*Position != '\r' && *Position != '\n') 256 continue; 257 258 // Eat \r\n or \n\r as a single line. 259 if ((Position[1] == '\r' || Position[1] == '\n') && 260 Position[0] != Position[1]) 261 ++Position; 262 ++Position; 263 break; 264 } 265 } 266 267 Position += TruncateAtColumn - 1; 268 269 // Truncate the buffer. 270 if (Position < Buffer->getBufferEnd()) { 271 llvm::StringRef Data(Buffer->getBufferStart(), 272 Position-Buffer->getBufferStart()); 273 MemoryBuffer *TruncatedBuffer 274 = MemoryBuffer::getMemBufferCopy(Data, Buffer->getBufferIdentifier()); 275 SourceMgr.overrideFileContents(File, TruncatedBuffer); 276 } 277 278 return false; 279} 280 281bool Preprocessor::isCodeCompletionFile(SourceLocation FileLoc) const { 282 return CodeCompletionFile && FileLoc.isFileID() && 283 SourceMgr.getFileEntryForID(SourceMgr.getFileID(FileLoc)) 284 == CodeCompletionFile; 285} 286 287void Preprocessor::CodeCompleteNaturalLanguage() { 288 SetCodeCompletionPoint(0, 0, 0); 289 getDiagnostics().setSuppressAllDiagnostics(true); 290 if (CodeComplete) 291 CodeComplete->CodeCompleteNaturalLanguage(); 292} 293 294//===----------------------------------------------------------------------===// 295// Token Spelling 296//===----------------------------------------------------------------------===// 297 298/// getSpelling() - Return the 'spelling' of this token. The spelling of a 299/// token are the characters used to represent the token in the source file 300/// after trigraph expansion and escaped-newline folding. In particular, this 301/// wants to get the true, uncanonicalized, spelling of things like digraphs 302/// UCNs, etc. 303std::string Preprocessor::getSpelling(const Token &Tok, 304 const SourceManager &SourceMgr, 305 const LangOptions &Features, 306 bool *Invalid) { 307 assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); 308 309 // If this token contains nothing interesting, return it directly. 310 bool CharDataInvalid = false; 311 const char* TokStart = SourceMgr.getCharacterData(Tok.getLocation(), 312 &CharDataInvalid); 313 if (Invalid) 314 *Invalid = CharDataInvalid; 315 if (CharDataInvalid) 316 return std::string(); 317 318 if (!Tok.needsCleaning()) 319 return std::string(TokStart, TokStart+Tok.getLength()); 320 321 std::string Result; 322 Result.reserve(Tok.getLength()); 323 324 // Otherwise, hard case, relex the characters into the string. 325 for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); 326 Ptr != End; ) { 327 unsigned CharSize; 328 Result.push_back(Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features)); 329 Ptr += CharSize; 330 } 331 assert(Result.size() != unsigned(Tok.getLength()) && 332 "NeedsCleaning flag set on something that didn't need cleaning!"); 333 return Result; 334} 335 336/// getSpelling() - Return the 'spelling' of this token. The spelling of a 337/// token are the characters used to represent the token in the source file 338/// after trigraph expansion and escaped-newline folding. In particular, this 339/// wants to get the true, uncanonicalized, spelling of things like digraphs 340/// UCNs, etc. 341std::string Preprocessor::getSpelling(const Token &Tok, bool *Invalid) const { 342 return getSpelling(Tok, SourceMgr, Features, Invalid); 343} 344 345/// getSpelling - This method is used to get the spelling of a token into a 346/// preallocated buffer, instead of as an std::string. The caller is required 347/// to allocate enough space for the token, which is guaranteed to be at least 348/// Tok.getLength() bytes long. The actual length of the token is returned. 349/// 350/// Note that this method may do two possible things: it may either fill in 351/// the buffer specified with characters, or it may *change the input pointer* 352/// to point to a constant buffer with the data already in it (avoiding a 353/// copy). The caller is not allowed to modify the returned buffer pointer 354/// if an internal buffer is returned. 355unsigned Preprocessor::getSpelling(const Token &Tok, 356 const char *&Buffer, bool *Invalid) const { 357 assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); 358 359 // If this token is an identifier, just return the string from the identifier 360 // table, which is very quick. 361 if (const IdentifierInfo *II = Tok.getIdentifierInfo()) { 362 Buffer = II->getNameStart(); 363 return II->getLength(); 364 } 365 366 // Otherwise, compute the start of the token in the input lexer buffer. 367 const char *TokStart = 0; 368 369 if (Tok.isLiteral()) 370 TokStart = Tok.getLiteralData(); 371 372 if (TokStart == 0) { 373 bool CharDataInvalid = false; 374 TokStart = SourceMgr.getCharacterData(Tok.getLocation(), &CharDataInvalid); 375 if (Invalid) 376 *Invalid = CharDataInvalid; 377 if (CharDataInvalid) { 378 Buffer = ""; 379 return 0; 380 } 381 } 382 383 // If this token contains nothing interesting, return it directly. 384 if (!Tok.needsCleaning()) { 385 Buffer = TokStart; 386 return Tok.getLength(); 387 } 388 389 // Otherwise, hard case, relex the characters into the string. 390 char *OutBuf = const_cast<char*>(Buffer); 391 for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); 392 Ptr != End; ) { 393 unsigned CharSize; 394 *OutBuf++ = Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features); 395 Ptr += CharSize; 396 } 397 assert(unsigned(OutBuf-Buffer) != Tok.getLength() && 398 "NeedsCleaning flag set on something that didn't need cleaning!"); 399 400 return OutBuf-Buffer; 401} 402 403/// getSpelling - This method is used to get the spelling of a token into a 404/// SmallVector. Note that the returned StringRef may not point to the 405/// supplied buffer if a copy can be avoided. 406llvm::StringRef Preprocessor::getSpelling(const Token &Tok, 407 llvm::SmallVectorImpl<char> &Buffer, 408 bool *Invalid) const { 409 // Try the fast path. 410 if (const IdentifierInfo *II = Tok.getIdentifierInfo()) 411 return II->getName(); 412 413 // Resize the buffer if we need to copy into it. 414 if (Tok.needsCleaning()) 415 Buffer.resize(Tok.getLength()); 416 417 const char *Ptr = Buffer.data(); 418 unsigned Len = getSpelling(Tok, Ptr, Invalid); 419 return llvm::StringRef(Ptr, Len); 420} 421 422/// CreateString - Plop the specified string into a scratch buffer and return a 423/// location for it. If specified, the source location provides a source 424/// location for the token. 425void Preprocessor::CreateString(const char *Buf, unsigned Len, Token &Tok, 426 SourceLocation InstantiationLoc) { 427 Tok.setLength(Len); 428 429 const char *DestPtr; 430 SourceLocation Loc = ScratchBuf->getToken(Buf, Len, DestPtr); 431 432 if (InstantiationLoc.isValid()) 433 Loc = SourceMgr.createInstantiationLoc(Loc, InstantiationLoc, 434 InstantiationLoc, Len); 435 Tok.setLocation(Loc); 436 437 // If this is a literal token, set the pointer data. 438 if (Tok.isLiteral()) 439 Tok.setLiteralData(DestPtr); 440} 441 442 443/// AdvanceToTokenCharacter - Given a location that specifies the start of a 444/// token, return a new location that specifies a character within the token. 445SourceLocation Preprocessor::AdvanceToTokenCharacter(SourceLocation TokStart, 446 unsigned CharNo) { 447 // Figure out how many physical characters away the specified instantiation 448 // character is. This needs to take into consideration newlines and 449 // trigraphs. 450 bool Invalid = false; 451 const char *TokPtr = SourceMgr.getCharacterData(TokStart, &Invalid); 452 453 // If they request the first char of the token, we're trivially done. 454 if (Invalid || (CharNo == 0 && Lexer::isObviouslySimpleCharacter(*TokPtr))) 455 return TokStart; 456 457 unsigned PhysOffset = 0; 458 459 // The usual case is that tokens don't contain anything interesting. Skip 460 // over the uninteresting characters. If a token only consists of simple 461 // chars, this method is extremely fast. 462 while (Lexer::isObviouslySimpleCharacter(*TokPtr)) { 463 if (CharNo == 0) 464 return TokStart.getFileLocWithOffset(PhysOffset); 465 ++TokPtr, --CharNo, ++PhysOffset; 466 } 467 468 // If we have a character that may be a trigraph or escaped newline, use a 469 // lexer to parse it correctly. 470 for (; CharNo; --CharNo) { 471 unsigned Size; 472 Lexer::getCharAndSizeNoWarn(TokPtr, Size, Features); 473 TokPtr += Size; 474 PhysOffset += Size; 475 } 476 477 // Final detail: if we end up on an escaped newline, we want to return the 478 // location of the actual byte of the token. For example foo\<newline>bar 479 // advanced by 3 should return the location of b, not of \\. One compounding 480 // detail of this is that the escape may be made by a trigraph. 481 if (!Lexer::isObviouslySimpleCharacter(*TokPtr)) 482 PhysOffset += Lexer::SkipEscapedNewLines(TokPtr)-TokPtr; 483 484 return TokStart.getFileLocWithOffset(PhysOffset); 485} 486 487SourceLocation Preprocessor::getLocForEndOfToken(SourceLocation Loc, 488 unsigned Offset) { 489 if (Loc.isInvalid() || !Loc.isFileID()) 490 return SourceLocation(); 491 492 unsigned Len = Lexer::MeasureTokenLength(Loc, getSourceManager(), Features); 493 if (Len > Offset) 494 Len = Len - Offset; 495 else 496 return Loc; 497 498 return AdvanceToTokenCharacter(Loc, Len); 499} 500 501 502 503//===----------------------------------------------------------------------===// 504// Preprocessor Initialization Methods 505//===----------------------------------------------------------------------===// 506 507 508/// EnterMainSourceFile - Enter the specified FileID as the main source file, 509/// which implicitly adds the builtin defines etc. 510void Preprocessor::EnterMainSourceFile() { 511 // We do not allow the preprocessor to reenter the main file. Doing so will 512 // cause FileID's to accumulate information from both runs (e.g. #line 513 // information) and predefined macros aren't guaranteed to be set properly. 514 assert(NumEnteredSourceFiles == 0 && "Cannot reenter the main file!"); 515 FileID MainFileID = SourceMgr.getMainFileID(); 516 517 // Enter the main file source buffer. 518 EnterSourceFile(MainFileID, 0, SourceLocation()); 519 520 // If we've been asked to skip bytes in the main file (e.g., as part of a 521 // precompiled preamble), do so now. 522 if (SkipMainFilePreamble.first > 0) 523 CurLexer->SkipBytes(SkipMainFilePreamble.first, 524 SkipMainFilePreamble.second); 525 526 // Tell the header info that the main file was entered. If the file is later 527 // #imported, it won't be re-entered. 528 if (const FileEntry *FE = SourceMgr.getFileEntryForID(MainFileID)) 529 HeaderInfo.IncrementIncludeCount(FE); 530 531 // Preprocess Predefines to populate the initial preprocessor state. 532 llvm::MemoryBuffer *SB = 533 llvm::MemoryBuffer::getMemBufferCopy(Predefines, "<built-in>"); 534 assert(SB && "Cannot fail to create predefined source buffer"); 535 FileID FID = SourceMgr.createFileIDForMemBuffer(SB); 536 assert(!FID.isInvalid() && "Could not create FileID for predefines?"); 537 538 // Start parsing the predefines. 539 EnterSourceFile(FID, 0, SourceLocation()); 540} 541 542void Preprocessor::EndSourceFile() { 543 // Notify the client that we reached the end of the source file. 544 if (Callbacks) 545 Callbacks->EndOfMainFile(); 546} 547 548//===----------------------------------------------------------------------===// 549// Lexer Event Handling. 550//===----------------------------------------------------------------------===// 551 552/// LookUpIdentifierInfo - Given a tok::identifier token, look up the 553/// identifier information for the token and install it into the token. 554IdentifierInfo *Preprocessor::LookUpIdentifierInfo(Token &Identifier, 555 const char *BufPtr) const { 556 assert(Identifier.is(tok::identifier) && "Not an identifier!"); 557 assert(Identifier.getIdentifierInfo() == 0 && "Identinfo already exists!"); 558 559 // Look up this token, see if it is a macro, or if it is a language keyword. 560 IdentifierInfo *II; 561 if (BufPtr && !Identifier.needsCleaning()) { 562 // No cleaning needed, just use the characters from the lexed buffer. 563 II = getIdentifierInfo(llvm::StringRef(BufPtr, Identifier.getLength())); 564 } else { 565 // Cleaning needed, alloca a buffer, clean into it, then use the buffer. 566 llvm::SmallString<64> IdentifierBuffer; 567 llvm::StringRef CleanedStr = getSpelling(Identifier, IdentifierBuffer); 568 II = getIdentifierInfo(CleanedStr); 569 } 570 Identifier.setIdentifierInfo(II); 571 return II; 572} 573 574 575/// HandleIdentifier - This callback is invoked when the lexer reads an 576/// identifier. This callback looks up the identifier in the map and/or 577/// potentially macro expands it or turns it into a named token (like 'for'). 578/// 579/// Note that callers of this method are guarded by checking the 580/// IdentifierInfo's 'isHandleIdentifierCase' bit. If this method changes, the 581/// IdentifierInfo methods that compute these properties will need to change to 582/// match. 583void Preprocessor::HandleIdentifier(Token &Identifier) { 584 assert(Identifier.getIdentifierInfo() && 585 "Can't handle identifiers without identifier info!"); 586 587 IdentifierInfo &II = *Identifier.getIdentifierInfo(); 588 589 // If this identifier was poisoned, and if it was not produced from a macro 590 // expansion, emit an error. 591 if (II.isPoisoned() && CurPPLexer) { 592 if (&II != Ident__VA_ARGS__) // We warn about __VA_ARGS__ with poisoning. 593 Diag(Identifier, diag::err_pp_used_poisoned_id); 594 else 595 Diag(Identifier, diag::ext_pp_bad_vaargs_use); 596 } 597 598 // If this is a macro to be expanded, do it. 599 if (MacroInfo *MI = getMacroInfo(&II)) { 600 if (!DisableMacroExpansion && !Identifier.isExpandDisabled()) { 601 if (MI->isEnabled()) { 602 if (!HandleMacroExpandedIdentifier(Identifier, MI)) 603 return; 604 } else { 605 // C99 6.10.3.4p2 says that a disabled macro may never again be 606 // expanded, even if it's in a context where it could be expanded in the 607 // future. 608 Identifier.setFlag(Token::DisableExpand); 609 } 610 } 611 } 612 613 // C++ 2.11p2: If this is an alternative representation of a C++ operator, 614 // then we act as if it is the actual operator and not the textual 615 // representation of it. 616 if (II.isCPlusPlusOperatorKeyword()) 617 Identifier.setIdentifierInfo(0); 618 619 // If this is an extension token, diagnose its use. 620 // We avoid diagnosing tokens that originate from macro definitions. 621 // FIXME: This warning is disabled in cases where it shouldn't be, 622 // like "#define TY typeof", "TY(1) x". 623 if (II.isExtensionToken() && !DisableMacroExpansion) 624 Diag(Identifier, diag::ext_token_used); 625} 626 627void Preprocessor::AddCommentHandler(CommentHandler *Handler) { 628 assert(Handler && "NULL comment handler"); 629 assert(std::find(CommentHandlers.begin(), CommentHandlers.end(), Handler) == 630 CommentHandlers.end() && "Comment handler already registered"); 631 CommentHandlers.push_back(Handler); 632} 633 634void Preprocessor::RemoveCommentHandler(CommentHandler *Handler) { 635 std::vector<CommentHandler *>::iterator Pos 636 = std::find(CommentHandlers.begin(), CommentHandlers.end(), Handler); 637 assert(Pos != CommentHandlers.end() && "Comment handler not registered"); 638 CommentHandlers.erase(Pos); 639} 640 641bool Preprocessor::HandleComment(Token &result, SourceRange Comment) { 642 bool AnyPendingTokens = false; 643 for (std::vector<CommentHandler *>::iterator H = CommentHandlers.begin(), 644 HEnd = CommentHandlers.end(); 645 H != HEnd; ++H) { 646 if ((*H)->HandleComment(*this, Comment)) 647 AnyPendingTokens = true; 648 } 649 if (!AnyPendingTokens || getCommentRetentionState()) 650 return false; 651 Lex(result); 652 return true; 653} 654 655CommentHandler::~CommentHandler() { } 656 657CodeCompletionHandler::~CodeCompletionHandler() { } 658 659void Preprocessor::createPreprocessingRecord() { 660 if (Record) 661 return; 662 663 Record = new PreprocessingRecord; 664 addPPCallbacks(Record); 665} 666