Preprocessor.cpp revision dbf15cb5709067b3d23b3cdd8d014610ba4a8783
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" 41#include <cstdio> 42using namespace clang; 43 44//===----------------------------------------------------------------------===// 45 46PreprocessorFactory::~PreprocessorFactory() {} 47 48Preprocessor::Preprocessor(Diagnostic &diags, const LangOptions &opts, 49 TargetInfo &target, SourceManager &SM, 50 HeaderSearch &Headers, 51 IdentifierInfoLookup* IILookup) 52 : Diags(&diags), Features(opts), Target(target),FileMgr(Headers.getFileMgr()), 53 SourceMgr(SM), HeaderInfo(Headers), Identifiers(opts, IILookup), 54 CurPPLexer(0), CurDirLookup(0), Callbacks(0) { 55 ScratchBuf = new ScratchBuffer(SourceMgr); 56 57 // Clear stats. 58 NumDirectives = NumDefined = NumUndefined = NumPragma = 0; 59 NumIf = NumElse = NumEndif = 0; 60 NumEnteredSourceFiles = 0; 61 NumMacroExpanded = NumFnMacroExpanded = NumBuiltinMacroExpanded = 0; 62 NumFastMacroExpanded = NumTokenPaste = NumFastTokenPaste = 0; 63 MaxIncludeStackDepth = 0; 64 NumSkipped = 0; 65 66 // Default to discarding comments. 67 KeepComments = false; 68 KeepMacroComments = false; 69 70 // Macro expansion is enabled. 71 DisableMacroExpansion = false; 72 InMacroArgs = false; 73 NumCachedTokenLexers = 0; 74 75 CachedLexPos = 0; 76 77 // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro. 78 // This gets unpoisoned where it is allowed. 79 (Ident__VA_ARGS__ = getIdentifierInfo("__VA_ARGS__"))->setIsPoisoned(); 80 81 // Initialize the pragma handlers. 82 PragmaHandlers = new PragmaNamespace(0); 83 RegisterBuiltinPragmas(); 84 85 // Initialize builtin macros like __LINE__ and friends. 86 RegisterBuiltinMacros(); 87} 88 89Preprocessor::~Preprocessor() { 90 assert(BacktrackPositions.empty() && "EnableBacktrack/Backtrack imbalance!"); 91 92 while (!IncludeMacroStack.empty()) { 93 delete IncludeMacroStack.back().TheLexer; 94 delete IncludeMacroStack.back().TheTokenLexer; 95 IncludeMacroStack.pop_back(); 96 } 97 98 // Free any macro definitions. 99 for (llvm::DenseMap<IdentifierInfo*, MacroInfo*>::iterator I = 100 Macros.begin(), E = Macros.end(); I != E; ++I) { 101 // We don't need to free the MacroInfo objects directly. These 102 // will be released when the BumpPtrAllocator 'BP' object gets 103 // destroyed. We still need to run the dstor, however, to free 104 // memory alocated by MacroInfo. 105 I->second->Destroy(BP); 106 I->first->setHasMacroDefinition(false); 107 } 108 109 // Free any cached macro expanders. 110 for (unsigned i = 0, e = NumCachedTokenLexers; i != e; ++i) 111 delete TokenLexerCache[i]; 112 113 // Release pragma information. 114 delete PragmaHandlers; 115 116 // Delete the scratch buffer info. 117 delete ScratchBuf; 118 119 delete Callbacks; 120} 121 122void Preprocessor::setPTHManager(PTHManager* pm) { 123 PTH.reset(pm); 124 FileMgr.setStatCache(PTH->createStatCache()); 125} 126 127void Preprocessor::DumpToken(const Token &Tok, bool DumpFlags) const { 128 llvm::cerr << tok::getTokenName(Tok.getKind()) << " '" 129 << getSpelling(Tok) << "'"; 130 131 if (!DumpFlags) return; 132 133 llvm::cerr << "\t"; 134 if (Tok.isAtStartOfLine()) 135 llvm::cerr << " [StartOfLine]"; 136 if (Tok.hasLeadingSpace()) 137 llvm::cerr << " [LeadingSpace]"; 138 if (Tok.isExpandDisabled()) 139 llvm::cerr << " [ExpandDisabled]"; 140 if (Tok.needsCleaning()) { 141 const char *Start = SourceMgr.getCharacterData(Tok.getLocation()); 142 llvm::cerr << " [UnClean='" << std::string(Start, Start+Tok.getLength()) 143 << "']"; 144 } 145 146 llvm::cerr << "\tLoc=<"; 147 DumpLocation(Tok.getLocation()); 148 llvm::cerr << ">"; 149} 150 151void Preprocessor::DumpLocation(SourceLocation Loc) const { 152 Loc.dump(SourceMgr); 153} 154 155void Preprocessor::DumpMacro(const MacroInfo &MI) const { 156 llvm::cerr << "MACRO: "; 157 for (unsigned i = 0, e = MI.getNumTokens(); i != e; ++i) { 158 DumpToken(MI.getReplacementToken(i)); 159 llvm::cerr << " "; 160 } 161 llvm::cerr << "\n"; 162} 163 164void Preprocessor::PrintStats() { 165 llvm::cerr << "\n*** Preprocessor Stats:\n"; 166 llvm::cerr << NumDirectives << " directives found:\n"; 167 llvm::cerr << " " << NumDefined << " #define.\n"; 168 llvm::cerr << " " << NumUndefined << " #undef.\n"; 169 llvm::cerr << " #include/#include_next/#import:\n"; 170 llvm::cerr << " " << NumEnteredSourceFiles << " source files entered.\n"; 171 llvm::cerr << " " << MaxIncludeStackDepth << " max include stack depth\n"; 172 llvm::cerr << " " << NumIf << " #if/#ifndef/#ifdef.\n"; 173 llvm::cerr << " " << NumElse << " #else/#elif.\n"; 174 llvm::cerr << " " << NumEndif << " #endif.\n"; 175 llvm::cerr << " " << NumPragma << " #pragma.\n"; 176 llvm::cerr << NumSkipped << " #if/#ifndef#ifdef regions skipped\n"; 177 178 llvm::cerr << NumMacroExpanded << "/" << NumFnMacroExpanded << "/" 179 << NumBuiltinMacroExpanded << " obj/fn/builtin macros expanded, " 180 << NumFastMacroExpanded << " on the fast path.\n"; 181 llvm::cerr << (NumFastTokenPaste+NumTokenPaste) 182 << " token paste (##) operations performed, " 183 << NumFastTokenPaste << " on the fast path.\n"; 184} 185 186//===----------------------------------------------------------------------===// 187// Token Spelling 188//===----------------------------------------------------------------------===// 189 190 191/// getSpelling() - Return the 'spelling' of this token. The spelling of a 192/// token are the characters used to represent the token in the source file 193/// after trigraph expansion and escaped-newline folding. In particular, this 194/// wants to get the true, uncanonicalized, spelling of things like digraphs 195/// UCNs, etc. 196std::string Preprocessor::getSpelling(const Token &Tok) const { 197 assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); 198 199 // If this token contains nothing interesting, return it directly. 200 const char* TokStart = SourceMgr.getCharacterData(Tok.getLocation()); 201 if (!Tok.needsCleaning()) 202 return std::string(TokStart, TokStart+Tok.getLength()); 203 204 std::string Result; 205 Result.reserve(Tok.getLength()); 206 207 // Otherwise, hard case, relex the characters into the string. 208 for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); 209 Ptr != End; ) { 210 unsigned CharSize; 211 Result.push_back(Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features)); 212 Ptr += CharSize; 213 } 214 assert(Result.size() != unsigned(Tok.getLength()) && 215 "NeedsCleaning flag set on something that didn't need cleaning!"); 216 return Result; 217} 218 219/// getSpelling - This method is used to get the spelling of a token into a 220/// preallocated buffer, instead of as an std::string. The caller is required 221/// to allocate enough space for the token, which is guaranteed to be at least 222/// Tok.getLength() bytes long. The actual length of the token is returned. 223/// 224/// Note that this method may do two possible things: it may either fill in 225/// the buffer specified with characters, or it may *change the input pointer* 226/// to point to a constant buffer with the data already in it (avoiding a 227/// copy). The caller is not allowed to modify the returned buffer pointer 228/// if an internal buffer is returned. 229unsigned Preprocessor::getSpelling(const Token &Tok, 230 const char *&Buffer) const { 231 assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); 232 233 // If this token is an identifier, just return the string from the identifier 234 // table, which is very quick. 235 if (const IdentifierInfo *II = Tok.getIdentifierInfo()) { 236 Buffer = II->getName(); 237 return II->getLength(); 238 } 239 240 // Otherwise, compute the start of the token in the input lexer buffer. 241 const char *TokStart = 0; 242 243 if (Tok.isLiteral()) 244 TokStart = Tok.getLiteralData(); 245 246 if (TokStart == 0) 247 TokStart = SourceMgr.getCharacterData(Tok.getLocation()); 248 249 // If this token contains nothing interesting, return it directly. 250 if (!Tok.needsCleaning()) { 251 Buffer = TokStart; 252 return Tok.getLength(); 253 } 254 255 // Otherwise, hard case, relex the characters into the string. 256 char *OutBuf = const_cast<char*>(Buffer); 257 for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); 258 Ptr != End; ) { 259 unsigned CharSize; 260 *OutBuf++ = Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features); 261 Ptr += CharSize; 262 } 263 assert(unsigned(OutBuf-Buffer) != Tok.getLength() && 264 "NeedsCleaning flag set on something that didn't need cleaning!"); 265 266 return OutBuf-Buffer; 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, 281 InstantiationLoc, Len); 282 Tok.setLocation(Loc); 283 284 // If this is a literal token, set the pointer data. 285 if (Tok.isLiteral()) 286 Tok.setLiteralData(DestPtr); 287} 288 289 290/// AdvanceToTokenCharacter - Given a location that specifies the start of a 291/// token, return a new location that specifies a character within the token. 292SourceLocation Preprocessor::AdvanceToTokenCharacter(SourceLocation TokStart, 293 unsigned CharNo) { 294 // If they request the first char of the token, we're trivially done. 295 if (CharNo == 0) return TokStart; 296 297 // Figure out how many physical characters away the specified instantiation 298 // character is. This needs to take into consideration newlines and 299 // trigraphs. 300 const char *TokPtr = SourceMgr.getCharacterData(TokStart); 301 unsigned PhysOffset = 0; 302 303 // The usual case is that tokens don't contain anything interesting. Skip 304 // over the uninteresting characters. If a token only consists of simple 305 // chars, this method is extremely fast. 306 while (CharNo && Lexer::isObviouslySimpleCharacter(*TokPtr)) 307 ++TokPtr, --CharNo, ++PhysOffset; 308 309 // If we have a character that may be a trigraph or escaped newline, use a 310 // lexer to parse it correctly. 311 if (CharNo != 0) { 312 // Skip over characters the remaining characters. 313 for (; CharNo; --CharNo) { 314 unsigned Size; 315 Lexer::getCharAndSizeNoWarn(TokPtr, Size, Features); 316 TokPtr += Size; 317 PhysOffset += Size; 318 } 319 } 320 321 return TokStart.getFileLocWithOffset(PhysOffset); 322} 323 324/// \brief Computes the source location just past the end of the 325/// token at this source location. 326/// 327/// This routine can be used to produce a source location that 328/// points just past the end of the token referenced by \p Loc, and 329/// is generally used when a diagnostic needs to point just after a 330/// token where it expected something different that it received. If 331/// the returned source location would not be meaningful (e.g., if 332/// it points into a macro), this routine returns an invalid 333/// source location. 334SourceLocation Preprocessor::getLocForEndOfToken(SourceLocation Loc) { 335 if (Loc.isInvalid() || !Loc.isFileID()) 336 return SourceLocation(); 337 338 unsigned Len = Lexer::MeasureTokenLength(Loc, getSourceManager()); 339 return AdvanceToTokenCharacter(Loc, Len); 340} 341 342 343 344//===----------------------------------------------------------------------===// 345// Preprocessor Initialization Methods 346//===----------------------------------------------------------------------===// 347 348// Append a #define line to Buf for Macro. Macro should be of the form XXX, 349// in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit 350// "#define XXX Y z W". To get a #define with no value, use "XXX=". 351static void DefineBuiltinMacro(std::vector<char> &Buf, const char *Macro, 352 const char *Command = "#define ") { 353 Buf.insert(Buf.end(), Command, Command+strlen(Command)); 354 if (const char *Equal = strchr(Macro, '=')) { 355 // Turn the = into ' '. 356 Buf.insert(Buf.end(), Macro, Equal); 357 Buf.push_back(' '); 358 Buf.insert(Buf.end(), Equal+1, Equal+strlen(Equal)); 359 } else { 360 // Push "macroname 1". 361 Buf.insert(Buf.end(), Macro, Macro+strlen(Macro)); 362 Buf.push_back(' '); 363 Buf.push_back('1'); 364 } 365 Buf.push_back('\n'); 366} 367 368/// PickFP - This is used to pick a value based on the FP semantics of the 369/// specified FP model. 370template <typename T> 371static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, 372 T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal) { 373 if (Sem == &llvm::APFloat::IEEEsingle) 374 return IEEESingleVal; 375 if (Sem == &llvm::APFloat::IEEEdouble) 376 return IEEEDoubleVal; 377 if (Sem == &llvm::APFloat::x87DoubleExtended) 378 return X87DoubleExtendedVal; 379 assert(Sem == &llvm::APFloat::PPCDoubleDouble); 380 return PPCDoubleDoubleVal; 381} 382 383static void DefineFloatMacros(std::vector<char> &Buf, const char *Prefix, 384 const llvm::fltSemantics *Sem) { 385 const char *DenormMin, *Epsilon, *Max, *Min; 386 DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324", 387 "3.64519953188247460253e-4951L", 388 "4.94065645841246544176568792868221e-324L"); 389 int Digits = PickFP(Sem, 6, 15, 18, 31); 390 Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16", 391 "1.08420217248550443401e-19L", 392 "4.94065645841246544176568792868221e-324L"); 393 int HasInifinity = 1, HasQuietNaN = 1; 394 int MantissaDigits = PickFP(Sem, 24, 53, 64, 106); 395 int Min10Exp = PickFP(Sem, -37, -307, -4931, -291); 396 int Max10Exp = PickFP(Sem, 38, 308, 4932, 308); 397 int MinExp = PickFP(Sem, -125, -1021, -16381, -968); 398 int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024); 399 Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308", 400 "3.36210314311209350626e-4932L", 401 "2.00416836000897277799610805135016e-292L"); 402 Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308", 403 "1.18973149535723176502e+4932L", 404 "1.79769313486231580793728971405301e+308L"); 405 406 char MacroBuf[60]; 407 sprintf(MacroBuf, "__%s_DENORM_MIN__=%s", Prefix, DenormMin); 408 DefineBuiltinMacro(Buf, MacroBuf); 409 sprintf(MacroBuf, "__%s_DIG__=%d", Prefix, Digits); 410 DefineBuiltinMacro(Buf, MacroBuf); 411 sprintf(MacroBuf, "__%s_EPSILON__=%s", Prefix, Epsilon); 412 DefineBuiltinMacro(Buf, MacroBuf); 413 sprintf(MacroBuf, "__%s_HAS_INFINITY__=%d", Prefix, HasInifinity); 414 DefineBuiltinMacro(Buf, MacroBuf); 415 sprintf(MacroBuf, "__%s_HAS_QUIET_NAN__=%d", Prefix, HasQuietNaN); 416 DefineBuiltinMacro(Buf, MacroBuf); 417 sprintf(MacroBuf, "__%s_MANT_DIG__=%d", Prefix, MantissaDigits); 418 DefineBuiltinMacro(Buf, MacroBuf); 419 sprintf(MacroBuf, "__%s_MAX_10_EXP__=%d", Prefix, Max10Exp); 420 DefineBuiltinMacro(Buf, MacroBuf); 421 sprintf(MacroBuf, "__%s_MAX_EXP__=%d", Prefix, MaxExp); 422 DefineBuiltinMacro(Buf, MacroBuf); 423 sprintf(MacroBuf, "__%s_MAX__=%s", Prefix, Max); 424 DefineBuiltinMacro(Buf, MacroBuf); 425 sprintf(MacroBuf, "__%s_MIN_10_EXP__=(%d)", Prefix, Min10Exp); 426 DefineBuiltinMacro(Buf, MacroBuf); 427 sprintf(MacroBuf, "__%s_MIN_EXP__=(%d)", Prefix, MinExp); 428 DefineBuiltinMacro(Buf, MacroBuf); 429 sprintf(MacroBuf, "__%s_MIN__=%s", Prefix, Min); 430 DefineBuiltinMacro(Buf, MacroBuf); 431 sprintf(MacroBuf, "__%s_HAS_DENORM__=1", Prefix); 432 DefineBuiltinMacro(Buf, MacroBuf); 433} 434 435 436/// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro 437/// named MacroName with the max value for a type with width 'TypeWidth' a 438/// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL). 439static void DefineTypeSize(const char *MacroName, unsigned TypeWidth, 440 const char *ValSuffix, bool isSigned, 441 std::vector<char> &Buf) { 442 char MacroBuf[60]; 443 long long MaxVal; 444 if (isSigned) 445 MaxVal = (1LL << (TypeWidth - 1)) - 1; 446 else 447 MaxVal = ~0LL >> (64-TypeWidth); 448 449 sprintf(MacroBuf, "%s=%llu%s", MacroName, MaxVal, ValSuffix); 450 DefineBuiltinMacro(Buf, MacroBuf); 451} 452 453static void DefineType(const char *MacroName, TargetInfo::IntType Ty, 454 std::vector<char> &Buf) { 455 char MacroBuf[60]; 456 sprintf(MacroBuf, "%s=%s", MacroName, TargetInfo::getTypeName(Ty)); 457 DefineBuiltinMacro(Buf, MacroBuf); 458} 459 460 461static void InitializePredefinedMacros(Preprocessor &PP, 462 std::vector<char> &Buf) { 463 char MacroBuf[60]; 464 // Compiler version introspection macros. 465 DefineBuiltinMacro(Buf, "__llvm__=1"); // LLVM Backend 466 DefineBuiltinMacro(Buf, "__clang__=1"); // Clang Frontend 467 468 // Currently claim to be compatible with GCC 4.2.1-5621. 469 DefineBuiltinMacro(Buf, "__APPLE_CC__=5621"); 470 DefineBuiltinMacro(Buf, "__GNUC_MINOR__=2"); 471 DefineBuiltinMacro(Buf, "__GNUC_PATCHLEVEL__=1"); 472 DefineBuiltinMacro(Buf, "__GNUC__=4"); 473 DefineBuiltinMacro(Buf, "__GXX_ABI_VERSION=1002"); 474 DefineBuiltinMacro(Buf, "__VERSION__=\"4.2.1 Compatible Clang Compiler\""); 475 476 477 // Initialize language-specific preprocessor defines. 478 479 // These should all be defined in the preprocessor according to the 480 // current language configuration. 481 if (!PP.getLangOptions().Microsoft) 482 DefineBuiltinMacro(Buf, "__STDC__=1"); 483 if (PP.getLangOptions().AsmPreprocessor) 484 DefineBuiltinMacro(Buf, "__ASSEMBLER__=1"); 485 if (PP.getLangOptions().C99 && !PP.getLangOptions().CPlusPlus) 486 DefineBuiltinMacro(Buf, "__STDC_VERSION__=199901L"); 487 else if (0) // STDC94 ? 488 DefineBuiltinMacro(Buf, "__STDC_VERSION__=199409L"); 489 490 if (PP.getLangOptions().CPlusPlus0x) 491 DefineBuiltinMacro(Buf, "__GXX_EXPERIMENTAL_CXX0X__"); 492 493 if (PP.getLangOptions().Freestanding) 494 DefineBuiltinMacro(Buf, "__STDC_HOSTED__=0"); 495 else 496 DefineBuiltinMacro(Buf, "__STDC_HOSTED__=1"); 497 498 if (PP.getLangOptions().ObjC1) { 499 DefineBuiltinMacro(Buf, "__OBJC__=1"); 500#if 0 501// FIXME. This flag controls declaration of ivars which is 502// needed since we do not support synthesize ivars yet. 503 if (PP.getLangOptions().ObjCNonFragileABI) 504 DefineBuiltinMacro(Buf, "__OBJC2__=1"); 505#endif 506 507 if (PP.getLangOptions().getGCMode() == LangOptions::NonGC) { 508 DefineBuiltinMacro(Buf, "__weak="); 509 DefineBuiltinMacro(Buf, "__strong="); 510 } else { 511 DefineBuiltinMacro(Buf, "__weak=__attribute__((objc_gc(weak)))"); 512 DefineBuiltinMacro(Buf, "__strong=__attribute__((objc_gc(strong)))"); 513 DefineBuiltinMacro(Buf, "__OBJC_GC__=1"); 514 } 515 516 if (PP.getLangOptions().NeXTRuntime) 517 DefineBuiltinMacro(Buf, "__NEXT_RUNTIME__=1"); 518 } 519 520 // darwin_constant_cfstrings controls this. This is also dependent 521 // on other things like the runtime I believe. This is set even for C code. 522 DefineBuiltinMacro(Buf, "__CONSTANT_CFSTRINGS__=1"); 523 524 if (PP.getLangOptions().ObjC2) 525 DefineBuiltinMacro(Buf, "OBJC_NEW_PROPERTIES"); 526 527 if (PP.getLangOptions().PascalStrings) 528 DefineBuiltinMacro(Buf, "__PASCAL_STRINGS__"); 529 530 if (PP.getLangOptions().Blocks) { 531 DefineBuiltinMacro(Buf, "__block=__attribute__((__blocks__(byref)))"); 532 DefineBuiltinMacro(Buf, "__BLOCKS__=1"); 533 } 534 535 if (PP.getLangOptions().CPlusPlus) { 536 DefineBuiltinMacro(Buf, "__DEPRECATED=1"); 537 DefineBuiltinMacro(Buf, "__EXCEPTIONS=1"); 538 DefineBuiltinMacro(Buf, "__GNUG__=4"); 539 DefineBuiltinMacro(Buf, "__GXX_WEAK__=1"); 540 DefineBuiltinMacro(Buf, "__cplusplus=1"); 541 DefineBuiltinMacro(Buf, "__private_extern__=extern"); 542 } 543 544 // Filter out some microsoft extensions when trying to parse in ms-compat 545 // mode. 546 if (PP.getLangOptions().Microsoft) { 547 DefineBuiltinMacro(Buf, "_cdecl=__cdecl"); 548 DefineBuiltinMacro(Buf, "__int8=__INT8_TYPE__"); 549 DefineBuiltinMacro(Buf, "__int16=__INT16_TYPE__"); 550 DefineBuiltinMacro(Buf, "__int32=__INT32_TYPE__"); 551 DefineBuiltinMacro(Buf, "__int64=__INT64_TYPE__"); 552 } 553 554 // Initialize target-specific preprocessor defines. 555 const TargetInfo &TI = PP.getTargetInfo(); 556 557 // Define type sizing macros based on the target properties. 558 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 559 DefineBuiltinMacro(Buf, "__CHAR_BIT__=8"); 560 561 unsigned IntMaxWidth; 562 const char *IntMaxSuffix; 563 if (TI.getIntMaxType() == TargetInfo::SignedLongLong) { 564 IntMaxWidth = TI.getLongLongWidth(); 565 IntMaxSuffix = "LL"; 566 } else if (TI.getIntMaxType() == TargetInfo::SignedLong) { 567 IntMaxWidth = TI.getLongWidth(); 568 IntMaxSuffix = "L"; 569 } else { 570 assert(TI.getIntMaxType() == TargetInfo::SignedInt); 571 IntMaxWidth = TI.getIntWidth(); 572 IntMaxSuffix = ""; 573 } 574 575 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Buf); 576 DefineTypeSize("__SHRT_MAX__", TI.getShortWidth(), "", true, Buf); 577 DefineTypeSize("__INT_MAX__", TI.getIntWidth(), "", true, Buf); 578 DefineTypeSize("__LONG_MAX__", TI.getLongWidth(), "L", true, Buf); 579 DefineTypeSize("__LONG_LONG_MAX__", TI.getLongLongWidth(), "LL", true, Buf); 580 DefineTypeSize("__WCHAR_MAX__", TI.getWCharWidth(), "", true, Buf); 581 DefineTypeSize("__INTMAX_MAX__", IntMaxWidth, IntMaxSuffix, true, Buf); 582 583 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Buf); 584 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Buf); 585 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Buf); 586 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Buf); 587 DefineType("__SIZE_TYPE__", TI.getSizeType(), Buf); 588 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Buf); 589 // FIXME: TargetInfo hookize __WINT_TYPE__. 590 DefineBuiltinMacro(Buf, "__WINT_TYPE__=int"); 591 592 DefineFloatMacros(Buf, "FLT", &TI.getFloatFormat()); 593 DefineFloatMacros(Buf, "DBL", &TI.getDoubleFormat()); 594 DefineFloatMacros(Buf, "LDBL", &TI.getLongDoubleFormat()); 595 596 // Define a __POINTER_WIDTH__ macro for stdint.h. 597 sprintf(MacroBuf, "__POINTER_WIDTH__=%d", (int)TI.getPointerWidth(0)); 598 DefineBuiltinMacro(Buf, MacroBuf); 599 600 if (!TI.isCharSigned()) 601 DefineBuiltinMacro(Buf, "__CHAR_UNSIGNED__"); 602 603 // Define fixed-sized integer types for stdint.h 604 assert(TI.getCharWidth() == 8 && "unsupported target types"); 605 assert(TI.getShortWidth() == 16 && "unsupported target types"); 606 DefineBuiltinMacro(Buf, "__INT8_TYPE__=char"); 607 DefineBuiltinMacro(Buf, "__INT16_TYPE__=short"); 608 609 if (TI.getIntWidth() == 32) 610 DefineBuiltinMacro(Buf, "__INT32_TYPE__=int"); 611 else { 612 assert(TI.getLongLongWidth() == 32 && "unsupported target types"); 613 DefineBuiltinMacro(Buf, "__INT32_TYPE__=long long"); 614 } 615 616 // 16-bit targets doesn't necessarily have a 64-bit type. 617 if (TI.getLongLongWidth() == 64) 618 DefineBuiltinMacro(Buf, "__INT64_TYPE__=long long"); 619 620 // Add __builtin_va_list typedef. 621 { 622 const char *VAList = TI.getVAListDeclaration(); 623 Buf.insert(Buf.end(), VAList, VAList+strlen(VAList)); 624 Buf.push_back('\n'); 625 } 626 627 if (const char *Prefix = TI.getUserLabelPrefix()) { 628 sprintf(MacroBuf, "__USER_LABEL_PREFIX__=%s", Prefix); 629 DefineBuiltinMacro(Buf, MacroBuf); 630 } 631 632 // Build configuration options. FIXME: these should be controlled by 633 // command line options or something. 634 DefineBuiltinMacro(Buf, "__DYNAMIC__=1"); 635 DefineBuiltinMacro(Buf, "__FINITE_MATH_ONLY__=0"); 636 DefineBuiltinMacro(Buf, "__NO_INLINE__=1"); 637 DefineBuiltinMacro(Buf, "__PIC__=1"); 638 639 // Macros to control C99 numerics and <float.h> 640 DefineBuiltinMacro(Buf, "__FLT_EVAL_METHOD__=0"); 641 DefineBuiltinMacro(Buf, "__FLT_RADIX__=2"); 642 sprintf(MacroBuf, "__DECIMAL_DIG__=%d", 643 PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33)); 644 DefineBuiltinMacro(Buf, MacroBuf); 645 646 // Get other target #defines. 647 TI.getTargetDefines(PP.getLangOptions(), Buf); 648} 649 650 651/// EnterMainSourceFile - Enter the specified FileID as the main source file, 652/// which implicitly adds the builtin defines etc. 653void Preprocessor::EnterMainSourceFile() { 654 // We do not allow the preprocessor to reenter the main file. Doing so will 655 // cause FileID's to accumulate information from both runs (e.g. #line 656 // information) and predefined macros aren't guaranteed to be set properly. 657 assert(NumEnteredSourceFiles == 0 && "Cannot reenter the main file!"); 658 FileID MainFileID = SourceMgr.getMainFileID(); 659 660 // Enter the main file source buffer. 661 EnterSourceFile(MainFileID, 0); 662 663 // Tell the header info that the main file was entered. If the file is later 664 // #imported, it won't be re-entered. 665 if (const FileEntry *FE = SourceMgr.getFileEntryForID(MainFileID)) 666 HeaderInfo.IncrementIncludeCount(FE); 667 668 std::vector<char> PrologFile; 669 PrologFile.reserve(4080); 670 671 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 672 InitializePredefinedMacros(*this, PrologFile); 673 674 // Add on the predefines from the driver. Wrap in a #line directive to report 675 // that they come from the command line. 676 const char *LineDirective = "# 1 \"<command line>\" 1\n"; 677 PrologFile.insert(PrologFile.end(), 678 LineDirective, LineDirective+strlen(LineDirective)); 679 680 PrologFile.insert(PrologFile.end(), Predefines.begin(), Predefines.end()); 681 682 LineDirective = "# 2 \"<built-in>\" 2\n"; 683 PrologFile.insert(PrologFile.end(), 684 LineDirective, LineDirective+strlen(LineDirective)); 685 686 // Memory buffer must end with a null byte! 687 PrologFile.push_back(0); 688 689 // Now that we have emitted the predefined macros, #includes, etc into 690 // PrologFile, preprocess it to populate the initial preprocessor state. 691 llvm::MemoryBuffer *SB = 692 llvm::MemoryBuffer::getMemBufferCopy(&PrologFile.front(),&PrologFile.back(), 693 "<built-in>"); 694 assert(SB && "Cannot fail to create predefined source buffer"); 695 FileID FID = SourceMgr.createFileIDForMemBuffer(SB); 696 assert(!FID.isInvalid() && "Could not create FileID for predefines?"); 697 698 // Start parsing the predefines. 699 EnterSourceFile(FID, 0); 700} 701 702 703//===----------------------------------------------------------------------===// 704// Lexer Event Handling. 705//===----------------------------------------------------------------------===// 706 707/// LookUpIdentifierInfo - Given a tok::identifier token, look up the 708/// identifier information for the token and install it into the token. 709IdentifierInfo *Preprocessor::LookUpIdentifierInfo(Token &Identifier, 710 const char *BufPtr) { 711 assert(Identifier.is(tok::identifier) && "Not an identifier!"); 712 assert(Identifier.getIdentifierInfo() == 0 && "Identinfo already exists!"); 713 714 // Look up this token, see if it is a macro, or if it is a language keyword. 715 IdentifierInfo *II; 716 if (BufPtr && !Identifier.needsCleaning()) { 717 // No cleaning needed, just use the characters from the lexed buffer. 718 II = getIdentifierInfo(BufPtr, BufPtr+Identifier.getLength()); 719 } else { 720 // Cleaning needed, alloca a buffer, clean into it, then use the buffer. 721 llvm::SmallVector<char, 64> IdentifierBuffer; 722 IdentifierBuffer.resize(Identifier.getLength()); 723 const char *TmpBuf = &IdentifierBuffer[0]; 724 unsigned Size = getSpelling(Identifier, TmpBuf); 725 II = getIdentifierInfo(TmpBuf, TmpBuf+Size); 726 } 727 Identifier.setIdentifierInfo(II); 728 return II; 729} 730 731 732/// HandleIdentifier - This callback is invoked when the lexer reads an 733/// identifier. This callback looks up the identifier in the map and/or 734/// potentially macro expands it or turns it into a named token (like 'for'). 735/// 736/// Note that callers of this method are guarded by checking the 737/// IdentifierInfo's 'isHandleIdentifierCase' bit. If this method changes, the 738/// IdentifierInfo methods that compute these properties will need to change to 739/// match. 740void Preprocessor::HandleIdentifier(Token &Identifier) { 741 assert(Identifier.getIdentifierInfo() && 742 "Can't handle identifiers without identifier info!"); 743 744 IdentifierInfo &II = *Identifier.getIdentifierInfo(); 745 746 // If this identifier was poisoned, and if it was not produced from a macro 747 // expansion, emit an error. 748 if (II.isPoisoned() && CurPPLexer) { 749 if (&II != Ident__VA_ARGS__) // We warn about __VA_ARGS__ with poisoning. 750 Diag(Identifier, diag::err_pp_used_poisoned_id); 751 else 752 Diag(Identifier, diag::ext_pp_bad_vaargs_use); 753 } 754 755 // If this is a macro to be expanded, do it. 756 if (MacroInfo *MI = getMacroInfo(&II)) { 757 if (!DisableMacroExpansion && !Identifier.isExpandDisabled()) { 758 if (MI->isEnabled()) { 759 if (!HandleMacroExpandedIdentifier(Identifier, MI)) 760 return; 761 } else { 762 // C99 6.10.3.4p2 says that a disabled macro may never again be 763 // expanded, even if it's in a context where it could be expanded in the 764 // future. 765 Identifier.setFlag(Token::DisableExpand); 766 } 767 } 768 } 769 770 // C++ 2.11p2: If this is an alternative representation of a C++ operator, 771 // then we act as if it is the actual operator and not the textual 772 // representation of it. 773 if (II.isCPlusPlusOperatorKeyword()) 774 Identifier.setIdentifierInfo(0); 775 776 // If this is an extension token, diagnose its use. 777 // We avoid diagnosing tokens that originate from macro definitions. 778 if (II.isExtensionToken() && Features.C99 && !DisableMacroExpansion) 779 Diag(Identifier, diag::ext_token_used); 780} 781