Preprocessor.cpp revision 6ad474f82f0cf32e13128d89fa5ad3a37ae73530
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 "clang/Lex/HeaderSearch.h" 30#include "clang/Lex/MacroInfo.h" 31#include "clang/Lex/Pragma.h" 32#include "clang/Lex/ScratchBuffer.h" 33#include "clang/Lex/LexDiagnostic.h" 34#include "clang/Basic/SourceManager.h" 35#include "clang/Basic/FileManager.h" 36#include "clang/Basic/TargetInfo.h" 37#include "llvm/ADT/APFloat.h" 38#include "llvm/ADT/SmallVector.h" 39#include "llvm/Support/MemoryBuffer.h" 40#include "llvm/Support/Streams.h" 41using namespace clang; 42 43//===----------------------------------------------------------------------===// 44 45PreprocessorFactory::~PreprocessorFactory() {} 46 47Preprocessor::Preprocessor(Diagnostic &diags, const LangOptions &opts, 48 TargetInfo &target, SourceManager &SM, 49 HeaderSearch &Headers, 50 IdentifierInfoLookup* IILookup) 51 : Diags(diags), Features(opts), Target(target), FileMgr(Headers.getFileMgr()), 52 SourceMgr(SM), HeaderInfo(Headers), Identifiers(opts, IILookup), 53 CurPPLexer(0), CurDirLookup(0), Callbacks(0) { 54 ScratchBuf = new ScratchBuffer(SourceMgr); 55 56 // Clear stats. 57 NumDirectives = NumDefined = NumUndefined = NumPragma = 0; 58 NumIf = NumElse = NumEndif = 0; 59 NumEnteredSourceFiles = 0; 60 NumMacroExpanded = NumFnMacroExpanded = NumBuiltinMacroExpanded = 0; 61 NumFastMacroExpanded = NumTokenPaste = NumFastTokenPaste = 0; 62 MaxIncludeStackDepth = 0; 63 NumSkipped = 0; 64 65 // Default to discarding comments. 66 KeepComments = false; 67 KeepMacroComments = false; 68 69 // Macro expansion is enabled. 70 DisableMacroExpansion = false; 71 InMacroArgs = false; 72 NumCachedTokenLexers = 0; 73 74 CachedLexPos = 0; 75 76 // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro. 77 // This gets unpoisoned where it is allowed. 78 (Ident__VA_ARGS__ = getIdentifierInfo("__VA_ARGS__"))->setIsPoisoned(); 79 80 // Initialize the pragma handlers. 81 PragmaHandlers = new PragmaNamespace(0); 82 RegisterBuiltinPragmas(); 83 84 // Initialize builtin macros like __LINE__ and friends. 85 RegisterBuiltinMacros(); 86} 87 88Preprocessor::~Preprocessor() { 89 assert(BacktrackPositions.empty() && "EnableBacktrack/Backtrack imbalance!"); 90 91 while (!IncludeMacroStack.empty()) { 92 delete IncludeMacroStack.back().TheLexer; 93 delete IncludeMacroStack.back().TheTokenLexer; 94 IncludeMacroStack.pop_back(); 95 } 96 97 // Free any macro definitions. 98 for (llvm::DenseMap<IdentifierInfo*, MacroInfo*>::iterator I = 99 Macros.begin(), E = Macros.end(); I != E; ++I) { 100 // We don't need to free the MacroInfo objects directly. These 101 // will be released when the BumpPtrAllocator 'BP' object gets 102 // destroyed. We still need to run the dstor, however, to free 103 // memory alocated by MacroInfo. 104 I->second->~MacroInfo(); 105 I->first->setHasMacroDefinition(false); 106 } 107 108 // Free any cached macro expanders. 109 for (unsigned i = 0, e = NumCachedTokenLexers; i != e; ++i) 110 delete TokenLexerCache[i]; 111 112 // Release pragma information. 113 delete PragmaHandlers; 114 115 // Delete the scratch buffer info. 116 delete ScratchBuf; 117 118 delete Callbacks; 119} 120 121void Preprocessor::setPTHManager(PTHManager* pm) { 122 PTH.reset(pm); 123 FileMgr.setStatCache(PTH->createStatCache()); 124} 125 126void Preprocessor::DumpToken(const Token &Tok, bool DumpFlags) const { 127 llvm::cerr << tok::getTokenName(Tok.getKind()) << " '" 128 << getSpelling(Tok) << "'"; 129 130 if (!DumpFlags) return; 131 132 llvm::cerr << "\t"; 133 if (Tok.isAtStartOfLine()) 134 llvm::cerr << " [StartOfLine]"; 135 if (Tok.hasLeadingSpace()) 136 llvm::cerr << " [LeadingSpace]"; 137 if (Tok.isExpandDisabled()) 138 llvm::cerr << " [ExpandDisabled]"; 139 if (Tok.needsCleaning()) { 140 const char *Start = SourceMgr.getCharacterData(Tok.getLocation()); 141 llvm::cerr << " [UnClean='" << std::string(Start, Start+Tok.getLength()) 142 << "']"; 143 } 144 145 llvm::cerr << "\tLoc=<"; 146 DumpLocation(Tok.getLocation()); 147 llvm::cerr << ">"; 148} 149 150void Preprocessor::DumpLocation(SourceLocation Loc) const { 151 Loc.dump(SourceMgr); 152} 153 154void Preprocessor::DumpMacro(const MacroInfo &MI) const { 155 llvm::cerr << "MACRO: "; 156 for (unsigned i = 0, e = MI.getNumTokens(); i != e; ++i) { 157 DumpToken(MI.getReplacementToken(i)); 158 llvm::cerr << " "; 159 } 160 llvm::cerr << "\n"; 161} 162 163void Preprocessor::PrintStats() { 164 llvm::cerr << "\n*** Preprocessor Stats:\n"; 165 llvm::cerr << NumDirectives << " directives found:\n"; 166 llvm::cerr << " " << NumDefined << " #define.\n"; 167 llvm::cerr << " " << NumUndefined << " #undef.\n"; 168 llvm::cerr << " #include/#include_next/#import:\n"; 169 llvm::cerr << " " << NumEnteredSourceFiles << " source files entered.\n"; 170 llvm::cerr << " " << MaxIncludeStackDepth << " max include stack depth\n"; 171 llvm::cerr << " " << NumIf << " #if/#ifndef/#ifdef.\n"; 172 llvm::cerr << " " << NumElse << " #else/#elif.\n"; 173 llvm::cerr << " " << NumEndif << " #endif.\n"; 174 llvm::cerr << " " << NumPragma << " #pragma.\n"; 175 llvm::cerr << NumSkipped << " #if/#ifndef#ifdef regions skipped\n"; 176 177 llvm::cerr << NumMacroExpanded << "/" << NumFnMacroExpanded << "/" 178 << NumBuiltinMacroExpanded << " obj/fn/builtin macros expanded, " 179 << NumFastMacroExpanded << " on the fast path.\n"; 180 llvm::cerr << (NumFastTokenPaste+NumTokenPaste) 181 << " token paste (##) operations performed, " 182 << NumFastTokenPaste << " on the fast path.\n"; 183} 184 185//===----------------------------------------------------------------------===// 186// Token Spelling 187//===----------------------------------------------------------------------===// 188 189 190/// getSpelling() - Return the 'spelling' of this token. The spelling of a 191/// token are the characters used to represent the token in the source file 192/// after trigraph expansion and escaped-newline folding. In particular, this 193/// wants to get the true, uncanonicalized, spelling of things like digraphs 194/// UCNs, etc. 195std::string Preprocessor::getSpelling(const Token &Tok) const { 196 assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); 197 198 // If this token contains nothing interesting, return it directly. 199 const char* TokStart = SourceMgr.getCharacterData(Tok.getLocation()); 200 if (!Tok.needsCleaning()) 201 return std::string(TokStart, TokStart+Tok.getLength()); 202 203 std::string Result; 204 Result.reserve(Tok.getLength()); 205 206 // Otherwise, hard case, relex the characters into the string. 207 for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); 208 Ptr != End; ) { 209 unsigned CharSize; 210 Result.push_back(Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features)); 211 Ptr += CharSize; 212 } 213 assert(Result.size() != unsigned(Tok.getLength()) && 214 "NeedsCleaning flag set on something that didn't need cleaning!"); 215 return Result; 216} 217 218/// getSpelling - This method is used to get the spelling of a token into a 219/// preallocated buffer, instead of as an std::string. The caller is required 220/// to allocate enough space for the token, which is guaranteed to be at least 221/// Tok.getLength() bytes long. The actual length of the token is returned. 222/// 223/// Note that this method may do two possible things: it may either fill in 224/// the buffer specified with characters, or it may *change the input pointer* 225/// to point to a constant buffer with the data already in it (avoiding a 226/// copy). The caller is not allowed to modify the returned buffer pointer 227/// if an internal buffer is returned. 228unsigned Preprocessor::getSpelling(const Token &Tok, 229 const char *&Buffer) const { 230 assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); 231 232 // If this token is an identifier, just return the string from the identifier 233 // table, which is very quick. 234 if (const IdentifierInfo *II = Tok.getIdentifierInfo()) { 235 Buffer = II->getName(); 236 return II->getLength(); 237 } 238 239 // Otherwise, compute the start of the token in the input lexer buffer. 240 const char *TokStart = 0; 241 242 if (Tok.isLiteral()) 243 TokStart = Tok.getLiteralData(); 244 245 if (TokStart == 0) 246 TokStart = SourceMgr.getCharacterData(Tok.getLocation()); 247 248 // If this token contains nothing interesting, return it directly. 249 if (!Tok.needsCleaning()) { 250 Buffer = TokStart; 251 return Tok.getLength(); 252 } 253 254 // Otherwise, hard case, relex the characters into the string. 255 char *OutBuf = const_cast<char*>(Buffer); 256 for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); 257 Ptr != End; ) { 258 unsigned CharSize; 259 *OutBuf++ = Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features); 260 Ptr += CharSize; 261 } 262 assert(unsigned(OutBuf-Buffer) != Tok.getLength() && 263 "NeedsCleaning flag set on something that didn't need cleaning!"); 264 265 return OutBuf-Buffer; 266} 267 268 269/// CreateString - Plop the specified string into a scratch buffer and return a 270/// location for it. If specified, the source location provides a source 271/// location for the token. 272void Preprocessor::CreateString(const char *Buf, unsigned Len, Token &Tok, 273 SourceLocation InstantiationLoc) { 274 Tok.setLength(Len); 275 276 const char *DestPtr; 277 SourceLocation Loc = ScratchBuf->getToken(Buf, Len, DestPtr); 278 279 if (InstantiationLoc.isValid()) 280 Loc = SourceMgr.createInstantiationLoc(Loc, InstantiationLoc, Len); 281 Tok.setLocation(Loc); 282 283 // If this is a literal token, set the pointer data. 284 if (Tok.isLiteral()) 285 Tok.setLiteralData(DestPtr); 286} 287 288 289/// AdvanceToTokenCharacter - Given a location that specifies the start of a 290/// token, return a new location that specifies a character within the token. 291SourceLocation Preprocessor::AdvanceToTokenCharacter(SourceLocation TokStart, 292 unsigned CharNo) { 293 // If they request the first char of the token, we're trivially done. If this 294 // is a macro expansion, it doesn't make sense to point to a character within 295 // the instantiation point (the name). We could point to the source 296 // character, but without also pointing to instantiation info, this is 297 // confusing. 298 if (CharNo == 0 || TokStart.isMacroID()) return TokStart; 299 300 // Figure out how many physical characters away the specified instantiation 301 // character is. This needs to take into consideration newlines and 302 // trigraphs. 303 const char *TokPtr = SourceMgr.getCharacterData(TokStart); 304 unsigned PhysOffset = 0; 305 306 // The usual case is that tokens don't contain anything interesting. Skip 307 // over the uninteresting characters. If a token only consists of simple 308 // chars, this method is extremely fast. 309 while (CharNo && Lexer::isObviouslySimpleCharacter(*TokPtr)) 310 ++TokPtr, --CharNo, ++PhysOffset; 311 312 // If we have a character that may be a trigraph or escaped newline, use a 313 // lexer to parse it correctly. 314 if (CharNo != 0) { 315 // Skip over characters the remaining characters. 316 for (; CharNo; --CharNo) { 317 unsigned Size; 318 Lexer::getCharAndSizeNoWarn(TokPtr, Size, Features); 319 TokPtr += Size; 320 PhysOffset += Size; 321 } 322 } 323 324 return TokStart.getFileLocWithOffset(PhysOffset); 325} 326 327 328//===----------------------------------------------------------------------===// 329// Preprocessor Initialization Methods 330//===----------------------------------------------------------------------===// 331 332// Append a #define line to Buf for Macro. Macro should be of the form XXX, 333// in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit 334// "#define XXX Y z W". To get a #define with no value, use "XXX=". 335static void DefineBuiltinMacro(std::vector<char> &Buf, const char *Macro, 336 const char *Command = "#define ") { 337 Buf.insert(Buf.end(), Command, Command+strlen(Command)); 338 if (const char *Equal = strchr(Macro, '=')) { 339 // Turn the = into ' '. 340 Buf.insert(Buf.end(), Macro, Equal); 341 Buf.push_back(' '); 342 Buf.insert(Buf.end(), Equal+1, Equal+strlen(Equal)); 343 } else { 344 // Push "macroname 1". 345 Buf.insert(Buf.end(), Macro, Macro+strlen(Macro)); 346 Buf.push_back(' '); 347 Buf.push_back('1'); 348 } 349 Buf.push_back('\n'); 350} 351 352/// PickFP - This is used to pick a value based on the FP semantics of the 353/// specified FP model. 354template <typename T> 355static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, 356 T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal) { 357 if (Sem == &llvm::APFloat::IEEEsingle) 358 return IEEESingleVal; 359 if (Sem == &llvm::APFloat::IEEEdouble) 360 return IEEEDoubleVal; 361 if (Sem == &llvm::APFloat::x87DoubleExtended) 362 return X87DoubleExtendedVal; 363 assert(Sem == &llvm::APFloat::PPCDoubleDouble); 364 return PPCDoubleDoubleVal; 365} 366 367static void DefineFloatMacros(std::vector<char> &Buf, const char *Prefix, 368 const llvm::fltSemantics *Sem) { 369 const char *DenormMin, *Epsilon, *Max, *Min; 370 DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324", 371 "3.64519953188247460253e-4951L", 372 "4.94065645841246544176568792868221e-324L"); 373 int Digits = PickFP(Sem, 6, 15, 18, 31); 374 Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16", 375 "1.08420217248550443401e-19L", 376 "4.94065645841246544176568792868221e-324L"); 377 int HasInifinity = 1, HasQuietNaN = 1; 378 int MantissaDigits = PickFP(Sem, 24, 53, 64, 106); 379 int Min10Exp = PickFP(Sem, -37, -307, -4931, -291); 380 int Max10Exp = PickFP(Sem, 38, 308, 4932, 308); 381 int MinExp = PickFP(Sem, -125, -1021, -16381, -968); 382 int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024); 383 Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308", 384 "3.36210314311209350626e-4932L", 385 "2.00416836000897277799610805135016e-292L"); 386 Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308", 387 "1.18973149535723176502e+4932L", 388 "1.79769313486231580793728971405301e+308L"); 389 390 char MacroBuf[60]; 391 sprintf(MacroBuf, "__%s_DENORM_MIN__=%s", Prefix, DenormMin); 392 DefineBuiltinMacro(Buf, MacroBuf); 393 sprintf(MacroBuf, "__%s_DIG__=%d", Prefix, Digits); 394 DefineBuiltinMacro(Buf, MacroBuf); 395 sprintf(MacroBuf, "__%s_EPSILON__=%s", Prefix, Epsilon); 396 DefineBuiltinMacro(Buf, MacroBuf); 397 sprintf(MacroBuf, "__%s_HAS_INFINITY__=%d", Prefix, HasInifinity); 398 DefineBuiltinMacro(Buf, MacroBuf); 399 sprintf(MacroBuf, "__%s_HAS_QUIET_NAN__=%d", Prefix, HasQuietNaN); 400 DefineBuiltinMacro(Buf, MacroBuf); 401 sprintf(MacroBuf, "__%s_MANT_DIG__=%d", Prefix, MantissaDigits); 402 DefineBuiltinMacro(Buf, MacroBuf); 403 sprintf(MacroBuf, "__%s_MAX_10_EXP__=%d", Prefix, Max10Exp); 404 DefineBuiltinMacro(Buf, MacroBuf); 405 sprintf(MacroBuf, "__%s_MAX_EXP__=%d", Prefix, MaxExp); 406 DefineBuiltinMacro(Buf, MacroBuf); 407 sprintf(MacroBuf, "__%s_MAX__=%s", Prefix, Max); 408 DefineBuiltinMacro(Buf, MacroBuf); 409 sprintf(MacroBuf, "__%s_MIN_10_EXP__=(%d)", Prefix, Min10Exp); 410 DefineBuiltinMacro(Buf, MacroBuf); 411 sprintf(MacroBuf, "__%s_MIN_EXP__=(%d)", Prefix, MinExp); 412 DefineBuiltinMacro(Buf, MacroBuf); 413 sprintf(MacroBuf, "__%s_MIN__=%s", Prefix, Min); 414 DefineBuiltinMacro(Buf, MacroBuf); 415 sprintf(MacroBuf, "__%s_HAS_DENORM__=1", Prefix); 416 DefineBuiltinMacro(Buf, MacroBuf); 417} 418 419 420/// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro 421/// named MacroName with the max value for a type with width 'TypeWidth' a 422/// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL). 423static void DefineTypeSize(const char *MacroName, unsigned TypeWidth, 424 const char *ValSuffix, bool isSigned, 425 std::vector<char> &Buf) { 426 char MacroBuf[60]; 427 uint64_t MaxVal; 428 if (isSigned) 429 MaxVal = (1LL << (TypeWidth - 1)) - 1; 430 else 431 MaxVal = ~0LL >> (64-TypeWidth); 432 433 sprintf(MacroBuf, "%s=%llu%s", MacroName, MaxVal, ValSuffix); 434 DefineBuiltinMacro(Buf, MacroBuf); 435} 436 437static void DefineType(const char *MacroName, TargetInfo::IntType Ty, 438 std::vector<char> &Buf) { 439 char MacroBuf[60]; 440 sprintf(MacroBuf, "%s=%s", MacroName, TargetInfo::getTypeName(Ty)); 441 DefineBuiltinMacro(Buf, MacroBuf); 442} 443 444 445static void InitializePredefinedMacros(Preprocessor &PP, 446 std::vector<char> &Buf) { 447 char MacroBuf[60]; 448 // Compiler version introspection macros. 449 DefineBuiltinMacro(Buf, "__llvm__=1"); // LLVM Backend 450 DefineBuiltinMacro(Buf, "__clang__=1"); // Clang Frontend 451 452 // Currently claim to be compatible with GCC 4.2.1-5621. 453 DefineBuiltinMacro(Buf, "__APPLE_CC__=5621"); 454 DefineBuiltinMacro(Buf, "__GNUC_MINOR__=2"); 455 DefineBuiltinMacro(Buf, "__GNUC_PATCHLEVEL__=1"); 456 DefineBuiltinMacro(Buf, "__GNUC__=4"); 457 DefineBuiltinMacro(Buf, "__GXX_ABI_VERSION=1002"); 458 DefineBuiltinMacro(Buf, "__VERSION__=\"4.2.1 (Apple Computer, Inc. " 459 "build 5621) (dot 3)\""); 460 461 462 // Initialize language-specific preprocessor defines. 463 464 // FIXME: Implement magic like cpp_init_builtins for things like __STDC__ 465 // and __DATE__ etc. 466 // These should all be defined in the preprocessor according to the 467 // current language configuration. 468 if (!PP.getLangOptions().Microsoft) 469 DefineBuiltinMacro(Buf, "__STDC__=1"); 470 if (PP.getLangOptions().AsmPreprocessor) 471 DefineBuiltinMacro(Buf, "__ASSEMBLER__=1"); 472 if (PP.getLangOptions().C99 && !PP.getLangOptions().CPlusPlus) 473 DefineBuiltinMacro(Buf, "__STDC_VERSION__=199901L"); 474 else if (0) // STDC94 ? 475 DefineBuiltinMacro(Buf, "__STDC_VERSION__=199409L"); 476 477 DefineBuiltinMacro(Buf, "__STDC_HOSTED__=1"); 478 if (PP.getLangOptions().ObjC1) { 479 DefineBuiltinMacro(Buf, "__OBJC__=1"); 480 481 if (PP.getLangOptions().getGCMode() == LangOptions::NonGC) { 482 DefineBuiltinMacro(Buf, "__weak="); 483 DefineBuiltinMacro(Buf, "__strong="); 484 } else { 485 DefineBuiltinMacro(Buf, "__weak=__attribute__((objc_gc(weak)))"); 486 DefineBuiltinMacro(Buf, "__strong=__attribute__((objc_gc(strong)))"); 487 DefineBuiltinMacro(Buf, "__OBJC_GC__=1"); 488 } 489 490 if (PP.getLangOptions().NeXTRuntime) 491 DefineBuiltinMacro(Buf, "__NEXT_RUNTIME__=1"); 492 } 493 494 // darwin_constant_cfstrings controls this. This is also dependent 495 // on other things like the runtime I believe. This is set even for C code. 496 DefineBuiltinMacro(Buf, "__CONSTANT_CFSTRINGS__=1"); 497 498 if (PP.getLangOptions().ObjC2) 499 DefineBuiltinMacro(Buf, "OBJC_NEW_PROPERTIES"); 500 501 if (PP.getLangOptions().PascalStrings) 502 DefineBuiltinMacro(Buf, "__PASCAL_STRINGS__"); 503 504 if (PP.getLangOptions().Blocks) { 505 DefineBuiltinMacro(Buf, "__block=__attribute__((__blocks__(byref)))"); 506 DefineBuiltinMacro(Buf, "__BLOCKS__=1"); 507 } 508 509 if (PP.getLangOptions().CPlusPlus) { 510 DefineBuiltinMacro(Buf, "__DEPRECATED=1"); 511 DefineBuiltinMacro(Buf, "__EXCEPTIONS=1"); 512 DefineBuiltinMacro(Buf, "__GNUG__=4"); 513 DefineBuiltinMacro(Buf, "__GXX_WEAK__=1"); 514 DefineBuiltinMacro(Buf, "__cplusplus=1"); 515 DefineBuiltinMacro(Buf, "__private_extern__=extern"); 516 } 517 518 // Filter out some microsoft extensions when trying to parse in ms-compat 519 // mode. 520 if (PP.getLangOptions().Microsoft) { 521 DefineBuiltinMacro(Buf, "_cdecl=__cdecl"); 522 DefineBuiltinMacro(Buf, "__int8=__INT8_TYPE__"); 523 DefineBuiltinMacro(Buf, "__int16=__INT16_TYPE__"); 524 DefineBuiltinMacro(Buf, "__int32=__INT32_TYPE__"); 525 DefineBuiltinMacro(Buf, "__int64=__INT64_TYPE__"); 526 } 527 528 // Initialize target-specific preprocessor defines. 529 const TargetInfo &TI = PP.getTargetInfo(); 530 531 // Define type sizing macros based on the target properties. 532 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 533 DefineBuiltinMacro(Buf, "__CHAR_BIT__=8"); 534 535 unsigned IntMaxWidth; 536 const char *IntMaxSuffix; 537 if (TI.getIntMaxType() == TargetInfo::SignedLongLong) { 538 IntMaxWidth = TI.getLongLongWidth(); 539 IntMaxSuffix = "LL"; 540 } else if (TI.getIntMaxType() == TargetInfo::SignedLong) { 541 IntMaxWidth = TI.getLongWidth(); 542 IntMaxSuffix = "L"; 543 } else { 544 assert(TI.getIntMaxType() == TargetInfo::SignedInt); 545 IntMaxWidth = TI.getIntWidth(); 546 IntMaxSuffix = ""; 547 } 548 549 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Buf); 550 DefineTypeSize("__SHRT_MAX__", TI.getShortWidth(), "", true, Buf); 551 DefineTypeSize("__INT_MAX__", TI.getIntWidth(), "", true, Buf); 552 DefineTypeSize("__LONG_MAX__", TI.getLongWidth(), "L", true, Buf); 553 DefineTypeSize("__LONG_LONG_MAX__", TI.getLongLongWidth(), "LL", true, Buf); 554 DefineTypeSize("__WCHAR_MAX__", TI.getWCharWidth(), "", true, Buf); 555 DefineTypeSize("__INTMAX_MAX__", IntMaxWidth, IntMaxSuffix, true, Buf); 556 557 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Buf); 558 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Buf); 559 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Buf); 560 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Buf); 561 DefineType("__SIZE_TYPE__", TI.getSizeType(), Buf); 562 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Buf); 563 // FIXME: TargetInfo hookize __WINT_TYPE__. 564 DefineBuiltinMacro(Buf, "__WINT_TYPE__=int"); 565 566 DefineFloatMacros(Buf, "FLT", &TI.getFloatFormat()); 567 DefineFloatMacros(Buf, "DBL", &TI.getDoubleFormat()); 568 DefineFloatMacros(Buf, "LDBL", &TI.getLongDoubleFormat()); 569 570 // Define a __POINTER_WIDTH__ macro for stdint.h. 571 sprintf(MacroBuf, "__POINTER_WIDTH__=%d", (int)TI.getPointerWidth(0)); 572 DefineBuiltinMacro(Buf, MacroBuf); 573 574 if (!TI.isCharSigned()) 575 DefineBuiltinMacro(Buf, "__CHAR_UNSIGNED__"); 576 577 // Define fixed-sized integer types for stdint.h 578 assert(TI.getCharWidth() == 8 && "unsupported target types"); 579 assert(TI.getShortWidth() == 16 && "unsupported target types"); 580 DefineBuiltinMacro(Buf, "__INT8_TYPE__=char"); 581 DefineBuiltinMacro(Buf, "__INT16_TYPE__=short"); 582 583 if (TI.getIntWidth() == 32) 584 DefineBuiltinMacro(Buf, "__INT32_TYPE__=int"); 585 else { 586 assert(TI.getLongLongWidth() == 32 && "unsupported target types"); 587 DefineBuiltinMacro(Buf, "__INT32_TYPE__=long long"); 588 } 589 590 // 16-bit targets doesn't necessarily have a 64-bit type. 591 if (TI.getLongLongWidth() == 64) 592 DefineBuiltinMacro(Buf, "__INT64_TYPE__=long long"); 593 594 // Add __builtin_va_list typedef. 595 { 596 const char *VAList = TI.getVAListDeclaration(); 597 Buf.insert(Buf.end(), VAList, VAList+strlen(VAList)); 598 Buf.push_back('\n'); 599 } 600 601 if (const char *Prefix = TI.getUserLabelPrefix()) { 602 sprintf(MacroBuf, "__USER_LABEL_PREFIX__=%s", Prefix); 603 DefineBuiltinMacro(Buf, MacroBuf); 604 } 605 606 // Build configuration options. FIXME: these should be controlled by 607 // command line options or something. 608 DefineBuiltinMacro(Buf, "__DYNAMIC__=1"); 609 DefineBuiltinMacro(Buf, "__FINITE_MATH_ONLY__=0"); 610 DefineBuiltinMacro(Buf, "__NO_INLINE__=1"); 611 DefineBuiltinMacro(Buf, "__PIC__=1"); 612 613 // Macros to control C99 numerics and <float.h> 614 DefineBuiltinMacro(Buf, "__FLT_EVAL_METHOD__=0"); 615 DefineBuiltinMacro(Buf, "__FLT_RADIX__=2"); 616 sprintf(MacroBuf, "__DECIMAL_DIG__=%d", 617 PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33)); 618 DefineBuiltinMacro(Buf, MacroBuf); 619 620 // Get other target #defines. 621 TI.getTargetDefines(Buf); 622 623 // FIXME: Should emit a #line directive here. 624} 625 626 627/// EnterMainSourceFile - Enter the specified FileID as the main source file, 628/// which implicitly adds the builtin defines etc. 629void Preprocessor::EnterMainSourceFile() { 630 // We do not allow the preprocessor to reenter the main file. Doing so will 631 // cause FileID's to accumulate information from both runs (e.g. #line 632 // information) and predefined macros aren't guaranteed to be set properly. 633 assert(NumEnteredSourceFiles == 0 && "Cannot reenter the main file!"); 634 FileID MainFileID = SourceMgr.getMainFileID(); 635 636 // Enter the main file source buffer. 637 EnterSourceFile(MainFileID, 0); 638 639 // Tell the header info that the main file was entered. If the file is later 640 // #imported, it won't be re-entered. 641 if (const FileEntry *FE = SourceMgr.getFileEntryForID(MainFileID)) 642 HeaderInfo.IncrementIncludeCount(FE); 643 644 std::vector<char> PrologFile; 645 PrologFile.reserve(4080); 646 647 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 648 InitializePredefinedMacros(*this, PrologFile); 649 650 // Add on the predefines from the driver. 651 PrologFile.insert(PrologFile.end(), Predefines.begin(), Predefines.end()); 652 653 // Memory buffer must end with a null byte! 654 PrologFile.push_back(0); 655 656 // Now that we have emitted the predefined macros, #includes, etc into 657 // PrologFile, preprocess it to populate the initial preprocessor state. 658 llvm::MemoryBuffer *SB = 659 llvm::MemoryBuffer::getMemBufferCopy(&PrologFile.front(),&PrologFile.back(), 660 "<predefines>"); 661 assert(SB && "Cannot fail to create predefined source buffer"); 662 FileID FID = SourceMgr.createFileIDForMemBuffer(SB); 663 assert(!FID.isInvalid() && "Could not create FileID for predefines?"); 664 665 // Start parsing the predefines. 666 EnterSourceFile(FID, 0); 667} 668 669 670//===----------------------------------------------------------------------===// 671// Lexer Event Handling. 672//===----------------------------------------------------------------------===// 673 674/// LookUpIdentifierInfo - Given a tok::identifier token, look up the 675/// identifier information for the token and install it into the token. 676IdentifierInfo *Preprocessor::LookUpIdentifierInfo(Token &Identifier, 677 const char *BufPtr) { 678 assert(Identifier.is(tok::identifier) && "Not an identifier!"); 679 assert(Identifier.getIdentifierInfo() == 0 && "Identinfo already exists!"); 680 681 // Look up this token, see if it is a macro, or if it is a language keyword. 682 IdentifierInfo *II; 683 if (BufPtr && !Identifier.needsCleaning()) { 684 // No cleaning needed, just use the characters from the lexed buffer. 685 II = getIdentifierInfo(BufPtr, BufPtr+Identifier.getLength()); 686 } else { 687 // Cleaning needed, alloca a buffer, clean into it, then use the buffer. 688 llvm::SmallVector<char, 64> IdentifierBuffer; 689 IdentifierBuffer.resize(Identifier.getLength()); 690 const char *TmpBuf = &IdentifierBuffer[0]; 691 unsigned Size = getSpelling(Identifier, TmpBuf); 692 II = getIdentifierInfo(TmpBuf, TmpBuf+Size); 693 } 694 Identifier.setIdentifierInfo(II); 695 return II; 696} 697 698 699/// HandleIdentifier - This callback is invoked when the lexer reads an 700/// identifier. This callback looks up the identifier in the map and/or 701/// potentially macro expands it or turns it into a named token (like 'for'). 702/// 703/// Note that callers of this method are guarded by checking the 704/// IdentifierInfo's 'isHandleIdentifierCase' bit. If this method changes, the 705/// IdentifierInfo methods that compute these properties will need to change to 706/// match. 707void Preprocessor::HandleIdentifier(Token &Identifier) { 708 assert(Identifier.getIdentifierInfo() && 709 "Can't handle identifiers without identifier info!"); 710 711 IdentifierInfo &II = *Identifier.getIdentifierInfo(); 712 713 // If this identifier was poisoned, and if it was not produced from a macro 714 // expansion, emit an error. 715 if (II.isPoisoned() && CurPPLexer) { 716 if (&II != Ident__VA_ARGS__) // We warn about __VA_ARGS__ with poisoning. 717 Diag(Identifier, diag::err_pp_used_poisoned_id); 718 else 719 Diag(Identifier, diag::ext_pp_bad_vaargs_use); 720 } 721 722 // If this is a macro to be expanded, do it. 723 if (MacroInfo *MI = getMacroInfo(&II)) { 724 if (!DisableMacroExpansion && !Identifier.isExpandDisabled()) { 725 if (MI->isEnabled()) { 726 if (!HandleMacroExpandedIdentifier(Identifier, MI)) 727 return; 728 } else { 729 // C99 6.10.3.4p2 says that a disabled macro may never again be 730 // expanded, even if it's in a context where it could be expanded in the 731 // future. 732 Identifier.setFlag(Token::DisableExpand); 733 } 734 } 735 } 736 737 // C++ 2.11p2: If this is an alternative representation of a C++ operator, 738 // then we act as if it is the actual operator and not the textual 739 // representation of it. 740 if (II.isCPlusPlusOperatorKeyword()) 741 Identifier.setIdentifierInfo(0); 742 743 // If this is an extension token, diagnose its use. 744 // We avoid diagnosing tokens that originate from macro definitions. 745 if (II.isExtensionToken() && Features.C99 && !DisableMacroExpansion) 746 Diag(Identifier, diag::ext_token_used); 747} 748