1 //===--- InitPreprocessor.cpp - PP initialization code. ---------*- C++ -*-===// 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 clang::InitializePreprocessor function. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/Basic/Version.h" 15 #include "clang/Frontend/Utils.h" 16 #include "clang/Basic/MacroBuilder.h" 17 #include "clang/Basic/TargetInfo.h" 18 #include "clang/Frontend/FrontendDiagnostic.h" 19 #include "clang/Frontend/FrontendOptions.h" 20 #include "clang/Frontend/PreprocessorOptions.h" 21 #include "clang/Lex/Preprocessor.h" 22 #include "clang/Basic/FileManager.h" 23 #include "clang/Basic/SourceManager.h" 24 #include "llvm/ADT/APFloat.h" 25 #include "llvm/Support/FileSystem.h" 26 #include "llvm/Support/MemoryBuffer.h" 27 #include "llvm/Support/Path.h" 28 using namespace clang; 29 30 // Append a #define line to Buf for Macro. Macro should be of the form XXX, 31 // in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit 32 // "#define XXX Y z W". To get a #define with no value, use "XXX=". 33 static void DefineBuiltinMacro(MacroBuilder &Builder, llvm::StringRef Macro, 34 Diagnostic &Diags) { 35 std::pair<llvm::StringRef, llvm::StringRef> MacroPair = Macro.split('='); 36 llvm::StringRef MacroName = MacroPair.first; 37 llvm::StringRef MacroBody = MacroPair.second; 38 if (MacroName.size() != Macro.size()) { 39 // Per GCC -D semantics, the macro ends at \n if it exists. 40 llvm::StringRef::size_type End = MacroBody.find_first_of("\n\r"); 41 if (End != llvm::StringRef::npos) 42 Diags.Report(diag::warn_fe_macro_contains_embedded_newline) 43 << MacroName; 44 Builder.defineMacro(MacroName, MacroBody.substr(0, End)); 45 } else { 46 // Push "macroname 1". 47 Builder.defineMacro(Macro); 48 } 49 } 50 51 std::string clang::NormalizeDashIncludePath(llvm::StringRef File, 52 FileManager &FileMgr) { 53 // Implicit include paths should be resolved relative to the current 54 // working directory first, and then use the regular header search 55 // mechanism. The proper way to handle this is to have the 56 // predefines buffer located at the current working directory, but 57 // it has no file entry. For now, workaround this by using an 58 // absolute path if we find the file here, and otherwise letting 59 // header search handle it. 60 llvm::SmallString<128> Path(File); 61 llvm::sys::fs::make_absolute(Path); 62 bool exists; 63 if (llvm::sys::fs::exists(Path.str(), exists) || !exists) 64 Path = File; 65 else if (exists) 66 FileMgr.getFile(File); 67 68 return Lexer::Stringify(Path.str()); 69 } 70 71 /// AddImplicitInclude - Add an implicit #include of the specified file to the 72 /// predefines buffer. 73 static void AddImplicitInclude(MacroBuilder &Builder, llvm::StringRef File, 74 FileManager &FileMgr) { 75 Builder.append("#include \"" + 76 llvm::Twine(NormalizeDashIncludePath(File, FileMgr)) + "\""); 77 } 78 79 static void AddImplicitIncludeMacros(MacroBuilder &Builder, 80 llvm::StringRef File, 81 FileManager &FileMgr) { 82 Builder.append("#__include_macros \"" + 83 llvm::Twine(NormalizeDashIncludePath(File, FileMgr)) + "\""); 84 // Marker token to stop the __include_macros fetch loop. 85 Builder.append("##"); // ##? 86 } 87 88 /// AddImplicitIncludePTH - Add an implicit #include using the original file 89 /// used to generate a PTH cache. 90 static void AddImplicitIncludePTH(MacroBuilder &Builder, Preprocessor &PP, 91 llvm::StringRef ImplicitIncludePTH) { 92 PTHManager *P = PP.getPTHManager(); 93 // Null check 'P' in the corner case where it couldn't be created. 94 const char *OriginalFile = P ? P->getOriginalSourceFile() : 0; 95 96 if (!OriginalFile) { 97 PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header) 98 << ImplicitIncludePTH; 99 return; 100 } 101 102 AddImplicitInclude(Builder, OriginalFile, PP.getFileManager()); 103 } 104 105 /// PickFP - This is used to pick a value based on the FP semantics of the 106 /// specified FP model. 107 template <typename T> 108 static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, 109 T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal, 110 T IEEEQuadVal) { 111 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle) 112 return IEEESingleVal; 113 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble) 114 return IEEEDoubleVal; 115 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended) 116 return X87DoubleExtendedVal; 117 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble) 118 return PPCDoubleDoubleVal; 119 assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad); 120 return IEEEQuadVal; 121 } 122 123 static void DefineFloatMacros(MacroBuilder &Builder, llvm::StringRef Prefix, 124 const llvm::fltSemantics *Sem) { 125 const char *DenormMin, *Epsilon, *Max, *Min; 126 DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324", 127 "3.64519953188247460253e-4951L", 128 "4.94065645841246544176568792868221e-324L", 129 "6.47517511943802511092443895822764655e-4966L"); 130 int Digits = PickFP(Sem, 6, 15, 18, 31, 33); 131 Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16", 132 "1.08420217248550443401e-19L", 133 "4.94065645841246544176568792868221e-324L", 134 "1.92592994438723585305597794258492732e-34L"); 135 int MantissaDigits = PickFP(Sem, 24, 53, 64, 106, 113); 136 int Min10Exp = PickFP(Sem, -37, -307, -4931, -291, -4931); 137 int Max10Exp = PickFP(Sem, 38, 308, 4932, 308, 4932); 138 int MinExp = PickFP(Sem, -125, -1021, -16381, -968, -16381); 139 int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024, 16384); 140 Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308", 141 "3.36210314311209350626e-4932L", 142 "2.00416836000897277799610805135016e-292L", 143 "3.36210314311209350626267781732175260e-4932L"); 144 Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308", 145 "1.18973149535723176502e+4932L", 146 "1.79769313486231580793728971405301e+308L", 147 "1.18973149535723176508575932662800702e+4932L"); 148 149 llvm::SmallString<32> DefPrefix; 150 DefPrefix = "__"; 151 DefPrefix += Prefix; 152 DefPrefix += "_"; 153 154 Builder.defineMacro(DefPrefix + "DENORM_MIN__", DenormMin); 155 Builder.defineMacro(DefPrefix + "HAS_DENORM__"); 156 Builder.defineMacro(DefPrefix + "DIG__", llvm::Twine(Digits)); 157 Builder.defineMacro(DefPrefix + "EPSILON__", llvm::Twine(Epsilon)); 158 Builder.defineMacro(DefPrefix + "HAS_INFINITY__"); 159 Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__"); 160 Builder.defineMacro(DefPrefix + "MANT_DIG__", llvm::Twine(MantissaDigits)); 161 162 Builder.defineMacro(DefPrefix + "MAX_10_EXP__", llvm::Twine(Max10Exp)); 163 Builder.defineMacro(DefPrefix + "MAX_EXP__", llvm::Twine(MaxExp)); 164 Builder.defineMacro(DefPrefix + "MAX__", llvm::Twine(Max)); 165 166 Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+llvm::Twine(Min10Exp)+")"); 167 Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+llvm::Twine(MinExp)+")"); 168 Builder.defineMacro(DefPrefix + "MIN__", llvm::Twine(Min)); 169 } 170 171 172 /// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro 173 /// named MacroName with the max value for a type with width 'TypeWidth' a 174 /// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL). 175 static void DefineTypeSize(llvm::StringRef MacroName, unsigned TypeWidth, 176 llvm::StringRef ValSuffix, bool isSigned, 177 MacroBuilder &Builder) { 178 llvm::APInt MaxVal = isSigned ? llvm::APInt::getSignedMaxValue(TypeWidth) 179 : llvm::APInt::getMaxValue(TypeWidth); 180 Builder.defineMacro(MacroName, MaxVal.toString(10, isSigned) + ValSuffix); 181 } 182 183 /// DefineTypeSize - An overloaded helper that uses TargetInfo to determine 184 /// the width, suffix, and signedness of the given type 185 static void DefineTypeSize(llvm::StringRef MacroName, TargetInfo::IntType Ty, 186 const TargetInfo &TI, MacroBuilder &Builder) { 187 DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty), 188 TI.isTypeSigned(Ty), Builder); 189 } 190 191 static void DefineType(const llvm::Twine &MacroName, TargetInfo::IntType Ty, 192 MacroBuilder &Builder) { 193 Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty)); 194 } 195 196 static void DefineTypeWidth(llvm::StringRef MacroName, TargetInfo::IntType Ty, 197 const TargetInfo &TI, MacroBuilder &Builder) { 198 Builder.defineMacro(MacroName, llvm::Twine(TI.getTypeWidth(Ty))); 199 } 200 201 static void DefineTypeSizeof(llvm::StringRef MacroName, unsigned BitWidth, 202 const TargetInfo &TI, MacroBuilder &Builder) { 203 Builder.defineMacro(MacroName, 204 llvm::Twine(BitWidth / TI.getCharWidth())); 205 } 206 207 static void DefineExactWidthIntType(TargetInfo::IntType Ty, 208 const TargetInfo &TI, MacroBuilder &Builder) { 209 int TypeWidth = TI.getTypeWidth(Ty); 210 211 // Use the target specified int64 type, when appropriate, so that [u]int64_t 212 // ends up being defined in terms of the correct type. 213 if (TypeWidth == 64) 214 Ty = TI.getInt64Type(); 215 216 DefineType("__INT" + llvm::Twine(TypeWidth) + "_TYPE__", Ty, Builder); 217 218 llvm::StringRef ConstSuffix(TargetInfo::getTypeConstantSuffix(Ty)); 219 if (!ConstSuffix.empty()) 220 Builder.defineMacro("__INT" + llvm::Twine(TypeWidth) + "_C_SUFFIX__", 221 ConstSuffix); 222 } 223 224 static void InitializeStandardPredefinedMacros(const TargetInfo &TI, 225 const LangOptions &LangOpts, 226 const FrontendOptions &FEOpts, 227 MacroBuilder &Builder) { 228 if (!LangOpts.Microsoft && !LangOpts.TraditionalCPP) 229 Builder.defineMacro("__STDC__"); 230 if (LangOpts.Freestanding) 231 Builder.defineMacro("__STDC_HOSTED__", "0"); 232 else 233 Builder.defineMacro("__STDC_HOSTED__"); 234 235 if (!LangOpts.CPlusPlus) { 236 if (LangOpts.C99) 237 Builder.defineMacro("__STDC_VERSION__", "199901L"); 238 else if (!LangOpts.GNUMode && LangOpts.Digraphs) 239 Builder.defineMacro("__STDC_VERSION__", "199409L"); 240 } else { 241 if (LangOpts.GNUMode) 242 Builder.defineMacro("__cplusplus"); 243 else 244 // C++ [cpp.predefined]p1: 245 // The name_ _cplusplus is defined to the value 199711L when compiling a 246 // C++ translation unit. 247 Builder.defineMacro("__cplusplus", "199711L"); 248 } 249 250 if (LangOpts.ObjC1) 251 Builder.defineMacro("__OBJC__"); 252 253 // Not "standard" per se, but available even with the -undef flag. 254 if (LangOpts.AsmPreprocessor) 255 Builder.defineMacro("__ASSEMBLER__"); 256 } 257 258 static void InitializePredefinedMacros(const TargetInfo &TI, 259 const LangOptions &LangOpts, 260 const FrontendOptions &FEOpts, 261 MacroBuilder &Builder) { 262 // Compiler version introspection macros. 263 Builder.defineMacro("__llvm__"); // LLVM Backend 264 Builder.defineMacro("__clang__"); // Clang Frontend 265 #define TOSTR2(X) #X 266 #define TOSTR(X) TOSTR2(X) 267 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 268 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 269 #ifdef CLANG_VERSION_PATCHLEVEL 270 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 271 #else 272 Builder.defineMacro("__clang_patchlevel__", "0"); 273 #endif 274 Builder.defineMacro("__clang_version__", 275 "\"" CLANG_VERSION_STRING " (" 276 + getClangFullRepositoryVersion() + ")\""); 277 #undef TOSTR 278 #undef TOSTR2 279 // Currently claim to be compatible with GCC 4.2.1-5621. 280 Builder.defineMacro("__GNUC_MINOR__", "2"); 281 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 282 Builder.defineMacro("__GNUC__", "4"); 283 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 284 285 // As sad as it is, enough software depends on the __VERSION__ for version 286 // checks that it is necessary to report 4.2.1 (the base GCC version we claim 287 // compatibility with) first. 288 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " + 289 llvm::Twine(getClangFullCPPVersion()) + "\""); 290 291 // Initialize language-specific preprocessor defines. 292 293 // Standard conforming mode? 294 if (!LangOpts.GNUMode) 295 Builder.defineMacro("__STRICT_ANSI__"); 296 297 if (LangOpts.CPlusPlus0x) 298 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 299 300 if (LangOpts.ObjC1) { 301 if (LangOpts.ObjCNonFragileABI) { 302 Builder.defineMacro("__OBJC2__"); 303 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 304 } 305 306 if (LangOpts.getGCMode() != LangOptions::NonGC) 307 Builder.defineMacro("__OBJC_GC__"); 308 309 if (LangOpts.NeXTRuntime) 310 Builder.defineMacro("__NEXT_RUNTIME__"); 311 } 312 313 // darwin_constant_cfstrings controls this. This is also dependent 314 // on other things like the runtime I believe. This is set even for C code. 315 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 316 317 if (LangOpts.ObjC2) 318 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 319 320 if (LangOpts.PascalStrings) 321 Builder.defineMacro("__PASCAL_STRINGS__"); 322 323 if (LangOpts.Blocks) { 324 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 325 Builder.defineMacro("__BLOCKS__"); 326 } 327 328 if (LangOpts.Exceptions) 329 Builder.defineMacro("__EXCEPTIONS"); 330 if (LangOpts.RTTI) 331 Builder.defineMacro("__GXX_RTTI"); 332 if (LangOpts.SjLjExceptions) 333 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 334 335 if (LangOpts.Deprecated) 336 Builder.defineMacro("__DEPRECATED"); 337 338 if (LangOpts.CPlusPlus) { 339 Builder.defineMacro("__GNUG__", "4"); 340 Builder.defineMacro("__GXX_WEAK__"); 341 Builder.defineMacro("__private_extern__", "extern"); 342 } 343 344 if (LangOpts.Microsoft) { 345 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 346 // VC++ appears to only like __FUNCTION__. 347 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 348 // Work around some issues with Visual C++ headerws. 349 if (LangOpts.CPlusPlus) { 350 // Since we define wchar_t in C++ mode. 351 Builder.defineMacro("_WCHAR_T_DEFINED"); 352 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 353 // FIXME: Support Microsoft's __identifier extension in the lexer. 354 Builder.append("#define __identifier(x) x"); 355 Builder.append("class type_info;"); 356 } 357 358 if (LangOpts.CPlusPlus0x) { 359 Builder.defineMacro("_HAS_CHAR16_T_LANGUAGE_SUPPORT", "1"); 360 } 361 } 362 363 if (LangOpts.Optimize) 364 Builder.defineMacro("__OPTIMIZE__"); 365 if (LangOpts.OptimizeSize) 366 Builder.defineMacro("__OPTIMIZE_SIZE__"); 367 368 // Initialize target-specific preprocessor defines. 369 370 // Define type sizing macros based on the target properties. 371 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 372 Builder.defineMacro("__CHAR_BIT__", "8"); 373 374 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 375 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 376 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 377 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 378 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 379 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 380 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 381 382 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 383 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 384 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 385 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 386 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 387 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 388 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 389 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 390 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 391 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 392 DefineTypeSizeof("__SIZEOF_SIZE_T__", 393 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 394 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 395 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 396 DefineTypeSizeof("__SIZEOF_WINT_T__", 397 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 398 399 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 400 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 401 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 402 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 403 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 404 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 405 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 406 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 407 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 408 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 409 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 410 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 411 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 412 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 413 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 414 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 415 416 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); 417 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); 418 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); 419 420 // Define a __POINTER_WIDTH__ macro for stdint.h. 421 Builder.defineMacro("__POINTER_WIDTH__", 422 llvm::Twine((int)TI.getPointerWidth(0))); 423 424 if (!LangOpts.CharIsSigned) 425 Builder.defineMacro("__CHAR_UNSIGNED__"); 426 427 if (!TargetInfo::isTypeSigned(TI.getWIntType())) 428 Builder.defineMacro("__WINT_UNSIGNED__"); 429 430 // Define exact-width integer types for stdint.h 431 Builder.defineMacro("__INT" + llvm::Twine(TI.getCharWidth()) + "_TYPE__", 432 "char"); 433 434 if (TI.getShortWidth() > TI.getCharWidth()) 435 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 436 437 if (TI.getIntWidth() > TI.getShortWidth()) 438 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 439 440 if (TI.getLongWidth() > TI.getIntWidth()) 441 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 442 443 if (TI.getLongLongWidth() > TI.getLongWidth()) 444 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 445 446 // Add __builtin_va_list typedef. 447 Builder.append(TI.getVAListDeclaration()); 448 449 if (const char *Prefix = TI.getUserLabelPrefix()) 450 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 451 452 // Build configuration options. FIXME: these should be controlled by 453 // command line options or something. 454 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 455 456 if (LangOpts.GNUInline) 457 Builder.defineMacro("__GNUC_GNU_INLINE__"); 458 else 459 Builder.defineMacro("__GNUC_STDC_INLINE__"); 460 461 if (LangOpts.NoInline) 462 Builder.defineMacro("__NO_INLINE__"); 463 464 if (unsigned PICLevel = LangOpts.PICLevel) { 465 Builder.defineMacro("__PIC__", llvm::Twine(PICLevel)); 466 Builder.defineMacro("__pic__", llvm::Twine(PICLevel)); 467 } 468 469 // Macros to control C99 numerics and <float.h> 470 Builder.defineMacro("__FLT_EVAL_METHOD__", "0"); 471 Builder.defineMacro("__FLT_RADIX__", "2"); 472 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 473 Builder.defineMacro("__DECIMAL_DIG__", llvm::Twine(Dig)); 474 475 if (LangOpts.getStackProtectorMode() == LangOptions::SSPOn) 476 Builder.defineMacro("__SSP__"); 477 else if (LangOpts.getStackProtectorMode() == LangOptions::SSPReq) 478 Builder.defineMacro("__SSP_ALL__", "2"); 479 480 if (FEOpts.ProgramAction == frontend::RewriteObjC) 481 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 482 483 // Define a macro that exists only when using the static analyzer. 484 if (FEOpts.ProgramAction == frontend::RunAnalysis) 485 Builder.defineMacro("__clang_analyzer__"); 486 487 if (LangOpts.FastRelaxedMath) 488 Builder.defineMacro("__FAST_RELAXED_MATH__"); 489 490 // Get other target #defines. 491 TI.getTargetDefines(LangOpts, Builder); 492 } 493 494 // Initialize the remapping of files to alternative contents, e.g., 495 // those specified through other files. 496 static void InitializeFileRemapping(Diagnostic &Diags, 497 SourceManager &SourceMgr, 498 FileManager &FileMgr, 499 const PreprocessorOptions &InitOpts) { 500 // Remap files in the source manager (with buffers). 501 for (PreprocessorOptions::const_remapped_file_buffer_iterator 502 Remap = InitOpts.remapped_file_buffer_begin(), 503 RemapEnd = InitOpts.remapped_file_buffer_end(); 504 Remap != RemapEnd; 505 ++Remap) { 506 // Create the file entry for the file that we're mapping from. 507 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 508 Remap->second->getBufferSize(), 509 0); 510 if (!FromFile) { 511 Diags.Report(diag::err_fe_remap_missing_from_file) 512 << Remap->first; 513 if (!InitOpts.RetainRemappedFileBuffers) 514 delete Remap->second; 515 continue; 516 } 517 518 // Override the contents of the "from" file with the contents of 519 // the "to" file. 520 SourceMgr.overrideFileContents(FromFile, Remap->second, 521 InitOpts.RetainRemappedFileBuffers); 522 } 523 524 // Remap files in the source manager (with other files). 525 for (PreprocessorOptions::const_remapped_file_iterator 526 Remap = InitOpts.remapped_file_begin(), 527 RemapEnd = InitOpts.remapped_file_end(); 528 Remap != RemapEnd; 529 ++Remap) { 530 // Find the file that we're mapping to. 531 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 532 if (!ToFile) { 533 Diags.Report(diag::err_fe_remap_missing_to_file) 534 << Remap->first << Remap->second; 535 continue; 536 } 537 538 // Create the file entry for the file that we're mapping from. 539 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 540 ToFile->getSize(), 0); 541 if (!FromFile) { 542 Diags.Report(diag::err_fe_remap_missing_from_file) 543 << Remap->first; 544 continue; 545 } 546 547 // Override the contents of the "from" file with the contents of 548 // the "to" file. 549 SourceMgr.overrideFileContents(FromFile, ToFile); 550 } 551 552 SourceMgr.setOverridenFilesKeepOriginalName( 553 InitOpts.RemappedFilesKeepOriginalName); 554 } 555 556 /// InitializePreprocessor - Initialize the preprocessor getting it and the 557 /// environment ready to process a single file. This returns true on error. 558 /// 559 void clang::InitializePreprocessor(Preprocessor &PP, 560 const PreprocessorOptions &InitOpts, 561 const HeaderSearchOptions &HSOpts, 562 const FrontendOptions &FEOpts) { 563 std::string PredefineBuffer; 564 PredefineBuffer.reserve(4080); 565 llvm::raw_string_ostream Predefines(PredefineBuffer); 566 MacroBuilder Builder(Predefines); 567 568 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 569 PP.getFileManager(), InitOpts); 570 571 // Emit line markers for various builtin sections of the file. We don't do 572 // this in asm preprocessor mode, because "# 4" is not a line marker directive 573 // in this mode. 574 if (!PP.getLangOptions().AsmPreprocessor) 575 Builder.append("# 1 \"<built-in>\" 3"); 576 577 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 578 if (InitOpts.UsePredefines) 579 InitializePredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(), 580 FEOpts, Builder); 581 582 // Even with predefines off, some macros are still predefined. 583 // These should all be defined in the preprocessor according to the 584 // current language configuration. 585 InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(), 586 FEOpts, Builder); 587 588 // Add on the predefines from the driver. Wrap in a #line directive to report 589 // that they come from the command line. 590 if (!PP.getLangOptions().AsmPreprocessor) 591 Builder.append("# 1 \"<command line>\" 1"); 592 593 // Process #define's and #undef's in the order they are given. 594 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 595 if (InitOpts.Macros[i].second) // isUndef 596 Builder.undefineMacro(InitOpts.Macros[i].first); 597 else 598 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 599 PP.getDiagnostics()); 600 } 601 602 // If -imacros are specified, include them now. These are processed before 603 // any -include directives. 604 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 605 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i], 606 PP.getFileManager()); 607 608 // Process -include directives. 609 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 610 const std::string &Path = InitOpts.Includes[i]; 611 if (Path == InitOpts.ImplicitPTHInclude) 612 AddImplicitIncludePTH(Builder, PP, Path); 613 else 614 AddImplicitInclude(Builder, Path, PP.getFileManager()); 615 } 616 617 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 618 if (!PP.getLangOptions().AsmPreprocessor) 619 Builder.append("# 1 \"<built-in>\" 2"); 620 621 // Instruct the preprocessor to skip the preamble. 622 PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, 623 InitOpts.PrecompiledPreambleBytes.second); 624 625 // Copy PredefinedBuffer into the Preprocessor. 626 PP.setPredefines(Predefines.str()); 627 628 // Initialize the header search object. 629 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 630 PP.getLangOptions(), 631 PP.getTargetInfo().getTriple()); 632 } 633