Preprocessor.cpp revision 277faca30c9f8f72b79f55695cbe3395ec246e7c
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[MDNI] - 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/Basic/Diagnostic.h" 34#include "clang/Basic/SourceManager.h" 35#include "clang/Basic/TargetInfo.h" 36#include "llvm/ADT/APFloat.h" 37#include "llvm/ADT/SmallVector.h" 38#include "llvm/Support/MemoryBuffer.h" 39#include "llvm/Support/Streams.h" 40using namespace clang; 41 42//===----------------------------------------------------------------------===// 43 44PreprocessorFactory::~PreprocessorFactory() {} 45 46Preprocessor::Preprocessor(Diagnostic &diags, const LangOptions &opts, 47 TargetInfo &target, SourceManager &SM, 48 HeaderSearch &Headers, 49 IdentifierInfoLookup* IILookup) 50 : Diags(diags), Features(opts), Target(target), FileMgr(Headers.getFileMgr()), 51 SourceMgr(SM), HeaderInfo(Headers), Identifiers(opts, IILookup), 52 CurPPLexer(0), CurDirLookup(0), Callbacks(0) { 53 ScratchBuf = new ScratchBuffer(SourceMgr); 54 55 // Clear stats. 56 NumDirectives = NumDefined = NumUndefined = NumPragma = 0; 57 NumIf = NumElse = NumEndif = 0; 58 NumEnteredSourceFiles = 0; 59 NumMacroExpanded = NumFnMacroExpanded = NumBuiltinMacroExpanded = 0; 60 NumFastMacroExpanded = NumTokenPaste = NumFastTokenPaste = 0; 61 MaxIncludeStackDepth = 0; 62 NumSkipped = 0; 63 64 // Default to discarding comments. 65 KeepComments = false; 66 KeepMacroComments = false; 67 68 // Macro expansion is enabled. 69 DisableMacroExpansion = false; 70 InMacroArgs = false; 71 NumCachedTokenLexers = 0; 72 73 CachedLexPos = 0; 74 75 // "Poison" __VA_ARGS__, which can only appear in the expansion of a macro. 76 // This gets unpoisoned where it is allowed. 77 (Ident__VA_ARGS__ = getIdentifierInfo("__VA_ARGS__"))->setIsPoisoned(); 78 79 // Initialize the pragma handlers. 80 PragmaHandlers = new PragmaNamespace(0); 81 RegisterBuiltinPragmas(); 82 83 // Initialize builtin macros like __LINE__ and friends. 84 RegisterBuiltinMacros(); 85} 86 87Preprocessor::~Preprocessor() { 88 assert(BacktrackPositions.empty() && "EnableBacktrack/Backtrack imbalance!"); 89 90 while (!IncludeMacroStack.empty()) { 91 delete IncludeMacroStack.back().TheLexer; 92 delete IncludeMacroStack.back().TheTokenLexer; 93 IncludeMacroStack.pop_back(); 94 } 95 96 // Free any macro definitions. 97 for (llvm::DenseMap<IdentifierInfo*, MacroInfo*>::iterator I = 98 Macros.begin(), E = Macros.end(); I != E; ++I) { 99 // We don't need to free the MacroInfo objects directly. These 100 // will be released when the BumpPtrAllocator 'BP' object gets 101 // destroyed. We still need to run the dstor, however, to free 102 // memory alocated by MacroInfo. 103 I->second->~MacroInfo(); 104 I->first->setHasMacroDefinition(false); 105 } 106 107 // Free any cached macro expanders. 108 for (unsigned i = 0, e = NumCachedTokenLexers; i != e; ++i) 109 delete TokenLexerCache[i]; 110 111 // Release pragma information. 112 delete PragmaHandlers; 113 114 // Delete the scratch buffer info. 115 delete ScratchBuf; 116 117 delete Callbacks; 118} 119 120void Preprocessor::DumpToken(const Token &Tok, bool DumpFlags) const { 121 llvm::cerr << tok::getTokenName(Tok.getKind()) << " '" 122 << getSpelling(Tok) << "'"; 123 124 if (!DumpFlags) return; 125 126 llvm::cerr << "\t"; 127 if (Tok.isAtStartOfLine()) 128 llvm::cerr << " [StartOfLine]"; 129 if (Tok.hasLeadingSpace()) 130 llvm::cerr << " [LeadingSpace]"; 131 if (Tok.isExpandDisabled()) 132 llvm::cerr << " [ExpandDisabled]"; 133 if (Tok.needsCleaning()) { 134 const char *Start = SourceMgr.getCharacterData(Tok.getLocation()); 135 llvm::cerr << " [UnClean='" << std::string(Start, Start+Tok.getLength()) 136 << "']"; 137 } 138 139 llvm::cerr << "\tLoc=<"; 140 DumpLocation(Tok.getLocation()); 141 llvm::cerr << ">"; 142} 143 144void Preprocessor::DumpLocation(SourceLocation Loc) const { 145 SourceLocation LogLoc = SourceMgr.getInstantiationLoc(Loc); 146 llvm::cerr << SourceMgr.getSourceName(LogLoc) << ':' 147 << SourceMgr.getLineNumber(LogLoc) << ':' 148 << SourceMgr.getColumnNumber(LogLoc); 149 150 SourceLocation SpellingLoc = SourceMgr.getSpellingLoc(Loc); 151 if (SpellingLoc != LogLoc) { 152 llvm::cerr << " <SpellingLoc="; 153 DumpLocation(SpellingLoc); 154 llvm::cerr << ">"; 155 } 156} 157 158void Preprocessor::DumpMacro(const MacroInfo &MI) const { 159 llvm::cerr << "MACRO: "; 160 for (unsigned i = 0, e = MI.getNumTokens(); i != e; ++i) { 161 DumpToken(MI.getReplacementToken(i)); 162 llvm::cerr << " "; 163 } 164 llvm::cerr << "\n"; 165} 166 167void Preprocessor::PrintStats() { 168 llvm::cerr << "\n*** Preprocessor Stats:\n"; 169 llvm::cerr << NumDirectives << " directives found:\n"; 170 llvm::cerr << " " << NumDefined << " #define.\n"; 171 llvm::cerr << " " << NumUndefined << " #undef.\n"; 172 llvm::cerr << " #include/#include_next/#import:\n"; 173 llvm::cerr << " " << NumEnteredSourceFiles << " source files entered.\n"; 174 llvm::cerr << " " << MaxIncludeStackDepth << " max include stack depth\n"; 175 llvm::cerr << " " << NumIf << " #if/#ifndef/#ifdef.\n"; 176 llvm::cerr << " " << NumElse << " #else/#elif.\n"; 177 llvm::cerr << " " << NumEndif << " #endif.\n"; 178 llvm::cerr << " " << NumPragma << " #pragma.\n"; 179 llvm::cerr << NumSkipped << " #if/#ifndef#ifdef regions skipped\n"; 180 181 llvm::cerr << NumMacroExpanded << "/" << NumFnMacroExpanded << "/" 182 << NumBuiltinMacroExpanded << " obj/fn/builtin macros expanded, " 183 << NumFastMacroExpanded << " on the fast path.\n"; 184 llvm::cerr << (NumFastTokenPaste+NumTokenPaste) 185 << " token paste (##) operations performed, " 186 << NumFastTokenPaste << " on the fast path.\n"; 187} 188 189//===----------------------------------------------------------------------===// 190// Token Spelling 191//===----------------------------------------------------------------------===// 192 193 194/// getSpelling() - Return the 'spelling' of this token. The spelling of a 195/// token are the characters used to represent the token in the source file 196/// after trigraph expansion and escaped-newline folding. In particular, this 197/// wants to get the true, uncanonicalized, spelling of things like digraphs 198/// UCNs, etc. 199std::string Preprocessor::getSpelling(const Token &Tok) const { 200 assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); 201 202 // If this token contains nothing interesting, return it directly. 203 const char* TokStart = SourceMgr.getCharacterData(Tok.getLocation()); 204 if (!Tok.needsCleaning()) 205 return std::string(TokStart, TokStart+Tok.getLength()); 206 207 std::string Result; 208 Result.reserve(Tok.getLength()); 209 210 // Otherwise, hard case, relex the characters into the string. 211 for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); 212 Ptr != End; ) { 213 unsigned CharSize; 214 Result.push_back(Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features)); 215 Ptr += CharSize; 216 } 217 assert(Result.size() != unsigned(Tok.getLength()) && 218 "NeedsCleaning flag set on something that didn't need cleaning!"); 219 return Result; 220} 221 222/// getSpelling - This method is used to get the spelling of a token into a 223/// preallocated buffer, instead of as an std::string. The caller is required 224/// to allocate enough space for the token, which is guaranteed to be at least 225/// Tok.getLength() bytes long. The actual length of the token is returned. 226/// 227/// Note that this method may do two possible things: it may either fill in 228/// the buffer specified with characters, or it may *change the input pointer* 229/// to point to a constant buffer with the data already in it (avoiding a 230/// copy). The caller is not allowed to modify the returned buffer pointer 231/// if an internal buffer is returned. 232unsigned Preprocessor::getSpelling(const Token &Tok, 233 const char *&Buffer) const { 234 assert((int)Tok.getLength() >= 0 && "Token character range is bogus!"); 235 236 // If this token is an identifier, just return the string from the identifier 237 // table, which is very quick. 238 if (const IdentifierInfo *II = Tok.getIdentifierInfo()) { 239 Buffer = II->getName(); 240 return II->getLength(); 241 } 242 243 // Otherwise, compute the start of the token in the input lexer buffer. 244 const char *TokStart = 0; 245 246 if (Tok.isLiteral()) 247 TokStart = Tok.getLiteralData(); 248 249 if (TokStart == 0) 250 TokStart = SourceMgr.getCharacterData(Tok.getLocation()); 251 252 // If this token contains nothing interesting, return it directly. 253 if (!Tok.needsCleaning()) { 254 Buffer = TokStart; 255 return Tok.getLength(); 256 } 257 258 // Otherwise, hard case, relex the characters into the string. 259 char *OutBuf = const_cast<char*>(Buffer); 260 for (const char *Ptr = TokStart, *End = TokStart+Tok.getLength(); 261 Ptr != End; ) { 262 unsigned CharSize; 263 *OutBuf++ = Lexer::getCharAndSizeNoWarn(Ptr, CharSize, Features); 264 Ptr += CharSize; 265 } 266 assert(unsigned(OutBuf-Buffer) != Tok.getLength() && 267 "NeedsCleaning flag set on something that didn't need cleaning!"); 268 269 return OutBuf-Buffer; 270} 271 272 273/// CreateString - Plop the specified string into a scratch buffer and return a 274/// location for it. If specified, the source location provides a source 275/// location for the token. 276void Preprocessor::CreateString(const char *Buf, unsigned Len, Token &Tok, 277 SourceLocation InstantiationLoc) { 278 Tok.setLength(Len); 279 280 const char *DestPtr; 281 SourceLocation Loc = ScratchBuf->getToken(Buf, Len, DestPtr); 282 283 if (InstantiationLoc.isValid()) 284 Loc = SourceMgr.createInstantiationLoc(Loc, InstantiationLoc, Len); 285 Tok.setLocation(Loc); 286 287 // If this is a literal token, set the pointer data. 288 if (Tok.isLiteral()) 289 Tok.setLiteralData(DestPtr); 290} 291 292 293/// AdvanceToTokenCharacter - Given a location that specifies the start of a 294/// token, return a new location that specifies a character within the token. 295SourceLocation Preprocessor::AdvanceToTokenCharacter(SourceLocation TokStart, 296 unsigned CharNo) { 297 // If they request the first char of the token, we're trivially done. If this 298 // is a macro expansion, it doesn't make sense to point to a character within 299 // the instantiation point (the name). We could point to the source 300 // character, but without also pointing to instantiation info, this is 301 // confusing. 302 if (CharNo == 0 || TokStart.isMacroID()) return TokStart; 303 304 // Figure out how many physical characters away the specified instantiation 305 // character is. This needs to take into consideration newlines and 306 // trigraphs. 307 const char *TokPtr = SourceMgr.getCharacterData(TokStart); 308 unsigned PhysOffset = 0; 309 310 // The usual case is that tokens don't contain anything interesting. Skip 311 // over the uninteresting characters. If a token only consists of simple 312 // chars, this method is extremely fast. 313 while (CharNo && Lexer::isObviouslySimpleCharacter(*TokPtr)) 314 ++TokPtr, --CharNo, ++PhysOffset; 315 316 // If we have a character that may be a trigraph or escaped newline, use a 317 // lexer to parse it correctly. 318 if (CharNo != 0) { 319 // Skip over characters the remaining characters. 320 for (; CharNo; --CharNo) { 321 unsigned Size; 322 Lexer::getCharAndSizeNoWarn(TokPtr, Size, Features); 323 TokPtr += Size; 324 PhysOffset += Size; 325 } 326 } 327 328 return TokStart.getFileLocWithOffset(PhysOffset); 329} 330 331 332//===----------------------------------------------------------------------===// 333// Preprocessor Initialization Methods 334//===----------------------------------------------------------------------===// 335 336// Append a #define line to Buf for Macro. Macro should be of the form XXX, 337// in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit 338// "#define XXX Y z W". To get a #define with no value, use "XXX=". 339static void DefineBuiltinMacro(std::vector<char> &Buf, const char *Macro, 340 const char *Command = "#define ") { 341 Buf.insert(Buf.end(), Command, Command+strlen(Command)); 342 if (const char *Equal = strchr(Macro, '=')) { 343 // Turn the = into ' '. 344 Buf.insert(Buf.end(), Macro, Equal); 345 Buf.push_back(' '); 346 Buf.insert(Buf.end(), Equal+1, Equal+strlen(Equal)); 347 } else { 348 // Push "macroname 1". 349 Buf.insert(Buf.end(), Macro, Macro+strlen(Macro)); 350 Buf.push_back(' '); 351 Buf.push_back('1'); 352 } 353 Buf.push_back('\n'); 354} 355 356/// PickFP - This is used to pick a value based on the FP semantics of the 357/// specified FP model. 358template <typename T> 359static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, 360 T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal) { 361 if (Sem == &llvm::APFloat::IEEEsingle) 362 return IEEESingleVal; 363 if (Sem == &llvm::APFloat::IEEEdouble) 364 return IEEEDoubleVal; 365 if (Sem == &llvm::APFloat::x87DoubleExtended) 366 return X87DoubleExtendedVal; 367 assert(Sem == &llvm::APFloat::PPCDoubleDouble); 368 return PPCDoubleDoubleVal; 369} 370 371static void DefineFloatMacros(std::vector<char> &Buf, const char *Prefix, 372 const llvm::fltSemantics *Sem) { 373 const char *DenormMin, *Epsilon, *Max, *Min; 374 DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324", 375 "3.64519953188247460253e-4951L", 376 "4.94065645841246544176568792868221e-324L"); 377 int Digits = PickFP(Sem, 6, 15, 18, 31); 378 Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16", 379 "1.08420217248550443401e-19L", 380 "4.94065645841246544176568792868221e-324L"); 381 int HasInifinity = 1, HasQuietNaN = 1; 382 int MantissaDigits = PickFP(Sem, 24, 53, 64, 106); 383 int Min10Exp = PickFP(Sem, -37, -307, -4931, -291); 384 int Max10Exp = PickFP(Sem, 38, 308, 4932, 308); 385 int MinExp = PickFP(Sem, -125, -1021, -16381, -968); 386 int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024); 387 Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308", 388 "3.36210314311209350626e-4932L", 389 "2.00416836000897277799610805135016e-292L"); 390 Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308", 391 "1.18973149535723176502e+4932L", 392 "1.79769313486231580793728971405301e+308L"); 393 394 char MacroBuf[60]; 395 sprintf(MacroBuf, "__%s_DENORM_MIN__=%s", Prefix, DenormMin); 396 DefineBuiltinMacro(Buf, MacroBuf); 397 sprintf(MacroBuf, "__%s_DIG__=%d", Prefix, Digits); 398 DefineBuiltinMacro(Buf, MacroBuf); 399 sprintf(MacroBuf, "__%s_EPSILON__=%s", Prefix, Epsilon); 400 DefineBuiltinMacro(Buf, MacroBuf); 401 sprintf(MacroBuf, "__%s_HAS_INFINITY__=%d", Prefix, HasInifinity); 402 DefineBuiltinMacro(Buf, MacroBuf); 403 sprintf(MacroBuf, "__%s_HAS_QUIET_NAN__=%d", Prefix, HasQuietNaN); 404 DefineBuiltinMacro(Buf, MacroBuf); 405 sprintf(MacroBuf, "__%s_MANT_DIG__=%d", Prefix, MantissaDigits); 406 DefineBuiltinMacro(Buf, MacroBuf); 407 sprintf(MacroBuf, "__%s_MAX_10_EXP__=%d", Prefix, Max10Exp); 408 DefineBuiltinMacro(Buf, MacroBuf); 409 sprintf(MacroBuf, "__%s_MAX_EXP__=%d", Prefix, MaxExp); 410 DefineBuiltinMacro(Buf, MacroBuf); 411 sprintf(MacroBuf, "__%s_MAX__=%s", Prefix, Max); 412 DefineBuiltinMacro(Buf, MacroBuf); 413 sprintf(MacroBuf, "__%s_MIN_10_EXP__=(%d)", Prefix, Min10Exp); 414 DefineBuiltinMacro(Buf, MacroBuf); 415 sprintf(MacroBuf, "__%s_MIN_EXP__=(%d)", Prefix, MinExp); 416 DefineBuiltinMacro(Buf, MacroBuf); 417 sprintf(MacroBuf, "__%s_MIN__=%s", Prefix, Min); 418 DefineBuiltinMacro(Buf, MacroBuf); 419} 420 421 422static void InitializePredefinedMacros(Preprocessor &PP, 423 std::vector<char> &Buf) { 424 // Compiler version introspection macros. 425 DefineBuiltinMacro(Buf, "__llvm__=1"); // LLVM Backend 426 DefineBuiltinMacro(Buf, "__clang__=1"); // Clang Frontend 427 428 // Currently claim to be compatible with GCC 4.2.1-5621. 429 DefineBuiltinMacro(Buf, "__APPLE_CC__=5621"); 430 DefineBuiltinMacro(Buf, "__GNUC_MINOR__=2"); 431 DefineBuiltinMacro(Buf, "__GNUC_PATCHLEVEL__=1"); 432 DefineBuiltinMacro(Buf, "__GNUC__=4"); 433 DefineBuiltinMacro(Buf, "__GXX_ABI_VERSION=1002"); 434 DefineBuiltinMacro(Buf, "__VERSION__=\"4.2.1 (Apple Computer, Inc. " 435 "build 5621) (dot 3)\""); 436 437 438 // Initialize language-specific preprocessor defines. 439 440 // FIXME: Implement magic like cpp_init_builtins for things like __STDC__ 441 // and __DATE__ etc. 442 // These should all be defined in the preprocessor according to the 443 // current language configuration. 444 if (!PP.getLangOptions().Microsoft) 445 DefineBuiltinMacro(Buf, "__STDC__=1"); 446 if (PP.getLangOptions().AsmPreprocessor) 447 DefineBuiltinMacro(Buf, "__ASSEMBLER__=1"); 448 if (PP.getLangOptions().C99 && !PP.getLangOptions().CPlusPlus) 449 DefineBuiltinMacro(Buf, "__STDC_VERSION__=199901L"); 450 else if (0) // STDC94 ? 451 DefineBuiltinMacro(Buf, "__STDC_VERSION__=199409L"); 452 453 DefineBuiltinMacro(Buf, "__STDC_HOSTED__=1"); 454 if (PP.getLangOptions().ObjC1) { 455 DefineBuiltinMacro(Buf, "__OBJC__=1"); 456 457 if (PP.getLangOptions().getGCMode() == LangOptions::NonGC) { 458 DefineBuiltinMacro(Buf, "__weak="); 459 DefineBuiltinMacro(Buf, "__strong="); 460 } else { 461 DefineBuiltinMacro(Buf, "__weak=__attribute__((objc_gc(weak)))"); 462 DefineBuiltinMacro(Buf, "__strong=__attribute__((objc_gc(strong)))"); 463 DefineBuiltinMacro(Buf, "__OBJC_GC__=1"); 464 } 465 466 if (PP.getLangOptions().NeXTRuntime) 467 DefineBuiltinMacro(Buf, "__NEXT_RUNTIME__=1"); 468 } 469 470 // darwin_constant_cfstrings controls this. This is also dependent 471 // on other things like the runtime I believe. This is set even for C code. 472 DefineBuiltinMacro(Buf, "__CONSTANT_CFSTRINGS__=1"); 473 474 if (PP.getLangOptions().ObjC2) 475 DefineBuiltinMacro(Buf, "OBJC_NEW_PROPERTIES"); 476 477 if (PP.getLangOptions().PascalStrings) 478 DefineBuiltinMacro(Buf, "__PASCAL_STRINGS__"); 479 480 if (PP.getLangOptions().Blocks) { 481 DefineBuiltinMacro(Buf, "__block=__attribute__((__blocks__(byref)))"); 482 DefineBuiltinMacro(Buf, "__BLOCKS__=1"); 483 } 484 485 if (PP.getLangOptions().CPlusPlus) { 486 DefineBuiltinMacro(Buf, "__DEPRECATED=1"); 487 DefineBuiltinMacro(Buf, "__EXCEPTIONS=1"); 488 DefineBuiltinMacro(Buf, "__GNUG__=4"); 489 DefineBuiltinMacro(Buf, "__GXX_WEAK__=1"); 490 DefineBuiltinMacro(Buf, "__cplusplus=1"); 491 DefineBuiltinMacro(Buf, "__private_extern__=extern"); 492 } 493 494 // Filter out some microsoft extensions when trying to parse in ms-compat 495 // mode. 496 if (PP.getLangOptions().Microsoft) { 497 DefineBuiltinMacro(Buf, "_cdecl=__cdecl"); 498 DefineBuiltinMacro(Buf, "__int8=char"); 499 DefineBuiltinMacro(Buf, "__int16=short"); 500 DefineBuiltinMacro(Buf, "__int32=int"); 501 DefineBuiltinMacro(Buf, "__int64=long long"); 502 } 503 504 505 // Initialize target-specific preprocessor defines. 506 const TargetInfo &TI = PP.getTargetInfo(); 507 508 // Define type sizing macros based on the target properties. 509 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 510 DefineBuiltinMacro(Buf, "__CHAR_BIT__=8"); 511 DefineBuiltinMacro(Buf, "__SCHAR_MAX__=127"); 512 513 assert(TI.getWCharWidth() == 32 && "Only support 32-bit wchar so far"); 514 DefineBuiltinMacro(Buf, "__WCHAR_MAX__=2147483647"); 515 DefineBuiltinMacro(Buf, "__WCHAR_TYPE__=int"); 516 DefineBuiltinMacro(Buf, "__WINT_TYPE__=int"); 517 518 assert(TI.getShortWidth() == 16 && "Only support 16-bit short so far"); 519 DefineBuiltinMacro(Buf, "__SHRT_MAX__=32767"); 520 521 if (TI.getIntWidth() == 32) 522 DefineBuiltinMacro(Buf, "__INT_MAX__=2147483647"); 523 else if (TI.getIntWidth() == 16) 524 DefineBuiltinMacro(Buf, "__INT_MAX__=32767"); 525 else 526 assert(0 && "Unknown integer size"); 527 528 if (TI.getLongLongWidth() == 64) 529 DefineBuiltinMacro(Buf, "__LONG_LONG_MAX__=9223372036854775807LL"); 530 else if (TI.getLongLongWidth() == 32) 531 DefineBuiltinMacro(Buf, "__LONG_LONG_MAX__=2147483647L"); 532 533 if (TI.getLongWidth() == 32) 534 DefineBuiltinMacro(Buf, "__LONG_MAX__=2147483647L"); 535 else if (TI.getLongWidth() == 64) 536 DefineBuiltinMacro(Buf, "__LONG_MAX__=9223372036854775807L"); 537 else if (TI.getLongWidth() == 16) 538 DefineBuiltinMacro(Buf, "__LONG_MAX__=32767L"); 539 else 540 assert(0 && "Unknown long size"); 541 char MacroBuf[60]; 542 sprintf(MacroBuf, "__INTMAX_MAX__=%lld", 543 (TI.getIntMaxType() == TargetInfo::UnsignedLongLong? 544 (1LL << (TI.getLongLongWidth() - 1)) : 545 ((1LL << (TI.getLongLongWidth() - 2)) - 1))); 546 DefineBuiltinMacro(Buf, MacroBuf); 547 548 if (TI.getIntMaxType() == TargetInfo::UnsignedLongLong) 549 DefineBuiltinMacro(Buf, "__INTMAX_TYPE__=unsigned long long int"); 550 else if (TI.getIntMaxType() == TargetInfo::SignedLongLong) 551 DefineBuiltinMacro(Buf, "__INTMAX_TYPE__=long long int"); 552 else if (TI.getIntMaxType() == TargetInfo::UnsignedLong) 553 DefineBuiltinMacro(Buf, "__INTMAX_TYPE__=unsigned long int"); 554 else if (TI.getIntMaxType() == TargetInfo::SignedLong) 555 DefineBuiltinMacro(Buf, "__INTMAX_TYPE__=long int"); 556 else if (TI.getIntMaxType() == TargetInfo::UnsignedInt) 557 DefineBuiltinMacro(Buf, "__INTMAX_TYPE__=unsigned int"); 558 else 559 DefineBuiltinMacro(Buf, "__INTMAX_TYPE__=int"); 560 561 if (TI.getUIntMaxType() == TargetInfo::UnsignedLongLong) 562 DefineBuiltinMacro(Buf, "__UINTMAX_TYPE__=unsigned long long int"); 563 else if (TI.getUIntMaxType() == TargetInfo::SignedLongLong) 564 DefineBuiltinMacro(Buf, "__UINTMAX_TYPE__=long long int"); 565 else if (TI.getUIntMaxType() == TargetInfo::UnsignedLong) 566 DefineBuiltinMacro(Buf, "__UINTMAX_TYPE__=unsigned long int"); 567 else if (TI.getUIntMaxType() == TargetInfo::SignedLong) 568 DefineBuiltinMacro(Buf, "__UINTMAX_TYPE__=long int"); 569 else if (TI.getUIntMaxType() == TargetInfo::UnsignedInt) 570 DefineBuiltinMacro(Buf, "__UINTMAX_TYPE__=unsigned int"); 571 else 572 DefineBuiltinMacro(Buf, "__UINTMAX_TYPE__=int"); 573 574 if (TI.getPtrDiffType(0) == TargetInfo::UnsignedLongLong) 575 DefineBuiltinMacro(Buf, "__PTRDIFF_TYPE__=unsigned long long int"); 576 else if (TI.getPtrDiffType(0) == TargetInfo::SignedLongLong) 577 DefineBuiltinMacro(Buf, "__PTRDIFF_TYPE__=long long int"); 578 else if (TI.getPtrDiffType(0) == TargetInfo::UnsignedLong) 579 DefineBuiltinMacro(Buf, "__PTRDIFF_TYPE__=unsigned long int"); 580 else if (TI.getPtrDiffType(0) == TargetInfo::SignedLong) 581 DefineBuiltinMacro(Buf, "__PTRDIFF_TYPE__=long int"); 582 else if (TI.getPtrDiffType(0) == TargetInfo::UnsignedInt) 583 DefineBuiltinMacro(Buf, "__PTRDIFF_TYPE__=unsigned int"); 584 else 585 DefineBuiltinMacro(Buf, "__PTRDIFF_TYPE__=int"); 586 587 if (TI.getSizeType() == TargetInfo::UnsignedLongLong) 588 DefineBuiltinMacro(Buf, "__SIZE_TYPE__=unsigned long long int"); 589 else if (TI.getSizeType() == TargetInfo::SignedLongLong) 590 DefineBuiltinMacro(Buf, "__SIZE_TYPE__=long long int"); 591 else if (TI.getSizeType() == TargetInfo::UnsignedLong) 592 DefineBuiltinMacro(Buf, "__SIZE_TYPE__=unsigned long int"); 593 else if (TI.getSizeType() == TargetInfo::SignedLong) 594 DefineBuiltinMacro(Buf, "__SIZE_TYPE__=long int"); 595 else if (TI.getSizeType() == TargetInfo::UnsignedInt) 596 DefineBuiltinMacro(Buf, "__SIZE_TYPE__=unsigned int"); 597 else if (TI.getSizeType() == TargetInfo::SignedInt) 598 DefineBuiltinMacro(Buf, "__SIZE_TYPE__=int"); 599 else 600 DefineBuiltinMacro(Buf, "__SIZE_TYPE__=unsigned short"); 601 602 DefineFloatMacros(Buf, "FLT", &TI.getFloatFormat()); 603 DefineFloatMacros(Buf, "DBL", &TI.getDoubleFormat()); 604 DefineFloatMacros(Buf, "LDBL", &TI.getLongDoubleFormat()); 605 606 607 // Add __builtin_va_list typedef. 608 { 609 const char *VAList = TI.getVAListDeclaration(); 610 Buf.insert(Buf.end(), VAList, VAList+strlen(VAList)); 611 Buf.push_back('\n'); 612 } 613 614 if (const char *Prefix = TI.getUserLabelPrefix()) { 615 sprintf(MacroBuf, "__USER_LABEL_PREFIX__=%s", Prefix); 616 DefineBuiltinMacro(Buf, MacroBuf); 617 } 618 619 // Build configuration options. FIXME: these should be controlled by 620 // command line options or something. 621 DefineBuiltinMacro(Buf, "__DYNAMIC__=1"); 622 DefineBuiltinMacro(Buf, "__FINITE_MATH_ONLY__=0"); 623 DefineBuiltinMacro(Buf, "__NO_INLINE__=1"); 624 DefineBuiltinMacro(Buf, "__PIC__=1"); 625 626 // Macros to control C99 numerics and <float.h> 627 DefineBuiltinMacro(Buf, "__FLT_EVAL_METHOD__=0"); 628 DefineBuiltinMacro(Buf, "__FLT_RADIX__=2"); 629 sprintf(MacroBuf, "__DECIMAL_DIG__=%d", 630 PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33)); 631 DefineBuiltinMacro(Buf, MacroBuf); 632 633 // Get other target #defines. 634 TI.getTargetDefines(Buf); 635 636 // FIXME: Should emit a #line directive here. 637} 638 639 640/// EnterMainSourceFile - Enter the specified FileID as the main source file, 641/// which implicitly adds the builtin defines etc. 642void Preprocessor::EnterMainSourceFile() { 643 644 FileID MainFileID = SourceMgr.getMainFileID(); 645 646 // Enter the main file source buffer. 647 EnterSourceFile(MainFileID, 0); 648 649 // Tell the header info that the main file was entered. If the file is later 650 // #imported, it won't be re-entered. 651 if (const FileEntry *FE = SourceMgr.getFileEntryForID(MainFileID)) 652 HeaderInfo.IncrementIncludeCount(FE); 653 654 std::vector<char> PrologFile; 655 PrologFile.reserve(4080); 656 657 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 658 InitializePredefinedMacros(*this, PrologFile); 659 660 // Add on the predefines from the driver. 661 PrologFile.insert(PrologFile.end(), Predefines.begin(), Predefines.end()); 662 663 // Memory buffer must end with a null byte! 664 PrologFile.push_back(0); 665 666 // Now that we have emitted the predefined macros, #includes, etc into 667 // PrologFile, preprocess it to populate the initial preprocessor state. 668 llvm::MemoryBuffer *SB = 669 llvm::MemoryBuffer::getMemBufferCopy(&PrologFile.front(),&PrologFile.back(), 670 "<predefines>"); 671 assert(SB && "Cannot fail to create predefined source buffer"); 672 FileID FID = SourceMgr.createFileIDForMemBuffer(SB); 673 assert(!FID.isInvalid() && "Could not create FileID for predefines?"); 674 675 // Start parsing the predefines. 676 EnterSourceFile(FID, 0); 677} 678 679 680//===----------------------------------------------------------------------===// 681// Lexer Event Handling. 682//===----------------------------------------------------------------------===// 683 684/// LookUpIdentifierInfo - Given a tok::identifier token, look up the 685/// identifier information for the token and install it into the token. 686IdentifierInfo *Preprocessor::LookUpIdentifierInfo(Token &Identifier, 687 const char *BufPtr) { 688 assert(Identifier.is(tok::identifier) && "Not an identifier!"); 689 assert(Identifier.getIdentifierInfo() == 0 && "Identinfo already exists!"); 690 691 // Look up this token, see if it is a macro, or if it is a language keyword. 692 IdentifierInfo *II; 693 if (BufPtr && !Identifier.needsCleaning()) { 694 // No cleaning needed, just use the characters from the lexed buffer. 695 II = getIdentifierInfo(BufPtr, BufPtr+Identifier.getLength()); 696 } else { 697 // Cleaning needed, alloca a buffer, clean into it, then use the buffer. 698 llvm::SmallVector<char, 64> IdentifierBuffer; 699 IdentifierBuffer.resize(Identifier.getLength()); 700 const char *TmpBuf = &IdentifierBuffer[0]; 701 unsigned Size = getSpelling(Identifier, TmpBuf); 702 II = getIdentifierInfo(TmpBuf, TmpBuf+Size); 703 } 704 Identifier.setIdentifierInfo(II); 705 return II; 706} 707 708 709/// HandleIdentifier - This callback is invoked when the lexer reads an 710/// identifier. This callback looks up the identifier in the map and/or 711/// potentially macro expands it or turns it into a named token (like 'for'). 712/// 713/// Note that callers of this method are guarded by checking the 714/// IdentifierInfo's 'isHandleIdentifierCase' bit. If this method changes, the 715/// IdentifierInfo methods that compute these properties will need to change to 716/// match. 717void Preprocessor::HandleIdentifier(Token &Identifier) { 718 assert(Identifier.getIdentifierInfo() && 719 "Can't handle identifiers without identifier info!"); 720 721 IdentifierInfo &II = *Identifier.getIdentifierInfo(); 722 723 // If this identifier was poisoned, and if it was not produced from a macro 724 // expansion, emit an error. 725 if (II.isPoisoned() && CurPPLexer) { 726 if (&II != Ident__VA_ARGS__) // We warn about __VA_ARGS__ with poisoning. 727 Diag(Identifier, diag::err_pp_used_poisoned_id); 728 else 729 Diag(Identifier, diag::ext_pp_bad_vaargs_use); 730 } 731 732 // If this is a macro to be expanded, do it. 733 if (MacroInfo *MI = getMacroInfo(&II)) { 734 if (!DisableMacroExpansion && !Identifier.isExpandDisabled()) { 735 if (MI->isEnabled()) { 736 if (!HandleMacroExpandedIdentifier(Identifier, MI)) 737 return; 738 } else { 739 // C99 6.10.3.4p2 says that a disabled macro may never again be 740 // expanded, even if it's in a context where it could be expanded in the 741 // future. 742 Identifier.setFlag(Token::DisableExpand); 743 } 744 } 745 } 746 747 // C++ 2.11p2: If this is an alternative representation of a C++ operator, 748 // then we act as if it is the actual operator and not the textual 749 // representation of it. 750 if (II.isCPlusPlusOperatorKeyword()) 751 Identifier.setIdentifierInfo(0); 752 753 // If this is an extension token, diagnose its use. 754 // We avoid diagnosing tokens that originate from macro definitions. 755 if (II.isExtensionToken() && Features.C99 && !DisableMacroExpansion) 756 Diag(Identifier, diag::ext_token_used); 757} 758