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/MemoryBuffer.h" 26 #include "llvm/System/Path.h" 27 using namespace clang; 28 29 // Append a #define line to Buf for Macro. Macro should be of the form XXX, 30 // in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit 31 // "#define XXX Y z W". To get a #define with no value, use "XXX=". 32 static void DefineBuiltinMacro(MacroBuilder &Builder, llvm::StringRef Macro, 33 Diagnostic &Diags) { 34 std::pair<llvm::StringRef, llvm::StringRef> MacroPair = Macro.split('='); 35 llvm::StringRef MacroName = MacroPair.first; 36 llvm::StringRef MacroBody = MacroPair.second; 37 if (MacroName.size() != Macro.size()) { 38 // Per GCC -D semantics, the macro ends at \n if it exists. 39 llvm::StringRef::size_type End = MacroBody.find_first_of("\n\r"); 40 if (End != llvm::StringRef::npos) 41 Diags.Report(diag::warn_fe_macro_contains_embedded_newline) 42 << MacroName; 43 Builder.defineMacro(MacroName, MacroBody.substr(0, End)); 44 } else { 45 // Push "macroname 1". 46 Builder.defineMacro(Macro); 47 } 48 } 49 50 std::string clang::NormalizeDashIncludePath(llvm::StringRef File) { 51 // Implicit include paths should be resolved relative to the current 52 // working directory first, and then use the regular header search 53 // mechanism. The proper way to handle this is to have the 54 // predefines buffer located at the current working directory, but 55 // it has not file entry. For now, workaround this by using an 56 // absolute path if we find the file here, and otherwise letting 57 // header search handle it. 58 llvm::sys::Path Path(File); 59 Path.makeAbsolute(); 60 if (!Path.exists()) 61 Path = File; 62 63 return Lexer::Stringify(Path.str()); 64 } 65 66 /// AddImplicitInclude - Add an implicit #include of the specified file to the 67 /// predefines buffer. 68 static void AddImplicitInclude(MacroBuilder &Builder, llvm::StringRef File) { 69 Builder.append("#include \"" + 70 llvm::Twine(NormalizeDashIncludePath(File)) + "\""); 71 } 72 73 static void AddImplicitIncludeMacros(MacroBuilder &Builder, 74 llvm::StringRef File) { 75 Builder.append("#__include_macros \"" + 76 llvm::Twine(NormalizeDashIncludePath(File)) + "\""); 77 // Marker token to stop the __include_macros fetch loop. 78 Builder.append("##"); // ##? 79 } 80 81 /// AddImplicitIncludePTH - Add an implicit #include using the original file 82 /// used to generate a PTH cache. 83 static void AddImplicitIncludePTH(MacroBuilder &Builder, Preprocessor &PP, 84 llvm::StringRef ImplicitIncludePTH) { 85 PTHManager *P = PP.getPTHManager(); 86 assert(P && "No PTHManager."); 87 const char *OriginalFile = P->getOriginalSourceFile(); 88 89 if (!OriginalFile) { 90 PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header) 91 << ImplicitIncludePTH; 92 return; 93 } 94 95 AddImplicitInclude(Builder, OriginalFile); 96 } 97 98 /// PickFP - This is used to pick a value based on the FP semantics of the 99 /// specified FP model. 100 template <typename T> 101 static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, 102 T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal, 103 T IEEEQuadVal) { 104 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle) 105 return IEEESingleVal; 106 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble) 107 return IEEEDoubleVal; 108 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended) 109 return X87DoubleExtendedVal; 110 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble) 111 return PPCDoubleDoubleVal; 112 assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad); 113 return IEEEQuadVal; 114 } 115 116 static void DefineFloatMacros(MacroBuilder &Builder, llvm::StringRef Prefix, 117 const llvm::fltSemantics *Sem) { 118 const char *DenormMin, *Epsilon, *Max, *Min; 119 DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324", 120 "3.64519953188247460253e-4951L", 121 "4.94065645841246544176568792868221e-324L", 122 "6.47517511943802511092443895822764655e-4966L"); 123 int Digits = PickFP(Sem, 6, 15, 18, 31, 33); 124 Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16", 125 "1.08420217248550443401e-19L", 126 "4.94065645841246544176568792868221e-324L", 127 "1.92592994438723585305597794258492732e-34L"); 128 int MantissaDigits = PickFP(Sem, 24, 53, 64, 106, 113); 129 int Min10Exp = PickFP(Sem, -37, -307, -4931, -291, -4931); 130 int Max10Exp = PickFP(Sem, 38, 308, 4932, 308, 4932); 131 int MinExp = PickFP(Sem, -125, -1021, -16381, -968, -16381); 132 int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024, 16384); 133 Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308", 134 "3.36210314311209350626e-4932L", 135 "2.00416836000897277799610805135016e-292L", 136 "3.36210314311209350626267781732175260e-4932L"); 137 Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308", 138 "1.18973149535723176502e+4932L", 139 "1.79769313486231580793728971405301e+308L", 140 "1.18973149535723176508575932662800702e+4932L"); 141 142 llvm::SmallString<32> DefPrefix; 143 DefPrefix = "__"; 144 DefPrefix += Prefix; 145 DefPrefix += "_"; 146 147 Builder.defineMacro(DefPrefix + "DENORM_MIN__", DenormMin); 148 Builder.defineMacro(DefPrefix + "HAS_DENORM__"); 149 Builder.defineMacro(DefPrefix + "DIG__", llvm::Twine(Digits)); 150 Builder.defineMacro(DefPrefix + "EPSILON__", llvm::Twine(Epsilon)); 151 Builder.defineMacro(DefPrefix + "HAS_INFINITY__"); 152 Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__"); 153 Builder.defineMacro(DefPrefix + "MANT_DIG__", llvm::Twine(MantissaDigits)); 154 155 Builder.defineMacro(DefPrefix + "MAX_10_EXP__", llvm::Twine(Max10Exp)); 156 Builder.defineMacro(DefPrefix + "MAX_EXP__", llvm::Twine(MaxExp)); 157 Builder.defineMacro(DefPrefix + "MAX__", llvm::Twine(Max)); 158 159 Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+llvm::Twine(Min10Exp)+")"); 160 Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+llvm::Twine(MinExp)+")"); 161 Builder.defineMacro(DefPrefix + "MIN__", llvm::Twine(Min)); 162 } 163 164 165 /// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro 166 /// named MacroName with the max value for a type with width 'TypeWidth' a 167 /// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL). 168 static void DefineTypeSize(llvm::StringRef MacroName, unsigned TypeWidth, 169 llvm::StringRef ValSuffix, bool isSigned, 170 MacroBuilder& Builder) { 171 long long MaxVal; 172 if (isSigned) 173 MaxVal = (1LL << (TypeWidth - 1)) - 1; 174 else 175 MaxVal = ~0LL >> (64-TypeWidth); 176 177 Builder.defineMacro(MacroName, llvm::Twine(MaxVal) + ValSuffix); 178 } 179 180 /// DefineTypeSize - An overloaded helper that uses TargetInfo to determine 181 /// the width, suffix, and signedness of the given type 182 static void DefineTypeSize(llvm::StringRef MacroName, TargetInfo::IntType Ty, 183 const TargetInfo &TI, MacroBuilder &Builder) { 184 DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty), 185 TI.isTypeSigned(Ty), Builder); 186 } 187 188 static void DefineType(const llvm::Twine &MacroName, TargetInfo::IntType Ty, 189 MacroBuilder &Builder) { 190 Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty)); 191 } 192 193 static void DefineTypeWidth(llvm::StringRef MacroName, TargetInfo::IntType Ty, 194 const TargetInfo &TI, MacroBuilder &Builder) { 195 Builder.defineMacro(MacroName, llvm::Twine(TI.getTypeWidth(Ty))); 196 } 197 198 static void DefineTypeSizeof(llvm::StringRef MacroName, unsigned BitWidth, 199 const TargetInfo &TI, MacroBuilder &Builder) { 200 Builder.defineMacro(MacroName, 201 llvm::Twine(BitWidth / TI.getCharWidth())); 202 } 203 204 static void DefineExactWidthIntType(TargetInfo::IntType Ty, 205 const TargetInfo &TI, MacroBuilder &Builder) { 206 int TypeWidth = TI.getTypeWidth(Ty); 207 DefineType("__INT" + llvm::Twine(TypeWidth) + "_TYPE__", Ty, Builder); 208 209 llvm::StringRef ConstSuffix(TargetInfo::getTypeConstantSuffix(Ty)); 210 if (!ConstSuffix.empty()) 211 Builder.defineMacro("__INT" + llvm::Twine(TypeWidth) + "_C_SUFFIX__", 212 ConstSuffix); 213 } 214 215 static void InitializePredefinedMacros(const TargetInfo &TI, 216 const LangOptions &LangOpts, 217 const FrontendOptions &FEOpts, 218 MacroBuilder &Builder) { 219 // Compiler version introspection macros. 220 Builder.defineMacro("__llvm__"); // LLVM Backend 221 Builder.defineMacro("__clang__"); // Clang Frontend 222 #define TOSTR2(X) #X 223 #define TOSTR(X) TOSTR2(X) 224 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 225 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 226 #ifdef CLANG_VERSION_PATCHLEVEL 227 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 228 #else 229 Builder.defineMacro("__clang_patchlevel__", "0"); 230 #endif 231 Builder.defineMacro("__clang_version__", 232 "\"" CLANG_VERSION_STRING " (" 233 + getClangFullRepositoryVersion() + ")\""); 234 #undef TOSTR 235 #undef TOSTR2 236 // Currently claim to be compatible with GCC 4.2.1-5621. 237 Builder.defineMacro("__GNUC_MINOR__", "2"); 238 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 239 Builder.defineMacro("__GNUC__", "4"); 240 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 241 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible Clang Compiler\""); 242 243 // Initialize language-specific preprocessor defines. 244 245 // These should all be defined in the preprocessor according to the 246 // current language configuration. 247 if (!LangOpts.Microsoft) 248 Builder.defineMacro("__STDC__"); 249 if (LangOpts.AsmPreprocessor) 250 Builder.defineMacro("__ASSEMBLER__"); 251 252 if (!LangOpts.CPlusPlus) { 253 if (LangOpts.C99) 254 Builder.defineMacro("__STDC_VERSION__", "199901L"); 255 else if (!LangOpts.GNUMode && LangOpts.Digraphs) 256 Builder.defineMacro("__STDC_VERSION__", "199409L"); 257 } 258 259 // Standard conforming mode? 260 if (!LangOpts.GNUMode) 261 Builder.defineMacro("__STRICT_ANSI__"); 262 263 if (LangOpts.CPlusPlus0x) 264 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 265 266 if (LangOpts.Freestanding) 267 Builder.defineMacro("__STDC_HOSTED__", "0"); 268 else 269 Builder.defineMacro("__STDC_HOSTED__"); 270 271 if (LangOpts.ObjC1) { 272 Builder.defineMacro("__OBJC__"); 273 if (LangOpts.ObjCNonFragileABI) { 274 Builder.defineMacro("__OBJC2__"); 275 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 276 } 277 278 if (LangOpts.getGCMode() != LangOptions::NonGC) 279 Builder.defineMacro("__OBJC_GC__"); 280 281 if (LangOpts.NeXTRuntime) 282 Builder.defineMacro("__NEXT_RUNTIME__"); 283 } 284 285 // darwin_constant_cfstrings controls this. This is also dependent 286 // on other things like the runtime I believe. This is set even for C code. 287 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 288 289 if (LangOpts.ObjC2) 290 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 291 292 if (LangOpts.PascalStrings) 293 Builder.defineMacro("__PASCAL_STRINGS__"); 294 295 if (LangOpts.Blocks) { 296 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 297 Builder.defineMacro("__BLOCKS__"); 298 } 299 300 if (LangOpts.Exceptions) 301 Builder.defineMacro("__EXCEPTIONS"); 302 if (LangOpts.RTTI) 303 Builder.defineMacro("__GXX_RTTI"); 304 if (LangOpts.SjLjExceptions) 305 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 306 307 if (LangOpts.CPlusPlus) { 308 Builder.defineMacro("__DEPRECATED"); 309 Builder.defineMacro("__GNUG__", "4"); 310 Builder.defineMacro("__GXX_WEAK__"); 311 if (LangOpts.GNUMode) 312 Builder.defineMacro("__cplusplus"); 313 else 314 // C++ [cpp.predefined]p1: 315 // The name_ _cplusplusis defined to the value199711Lwhen compiling a 316 // C++ translation unit. 317 Builder.defineMacro("__cplusplus", "199711L"); 318 Builder.defineMacro("__private_extern__", "extern"); 319 } 320 321 if (LangOpts.Microsoft) { 322 // Filter out some microsoft extensions when trying to parse in ms-compat 323 // mode. 324 Builder.defineMacro("__int8", "__INT8_TYPE__"); 325 Builder.defineMacro("__int16", "__INT16_TYPE__"); 326 Builder.defineMacro("__int32", "__INT32_TYPE__"); 327 Builder.defineMacro("__int64", "__INT64_TYPE__"); 328 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 329 // VC++ appears to only like __FUNCTION__. 330 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 331 // Work around some issues with Visual C++ headerws. 332 if (LangOpts.CPlusPlus) { 333 // Since we define wchar_t in C++ mode. 334 Builder.defineMacro("_WCHAR_T_DEFINED"); 335 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 336 // FIXME: This should be temporary until we have a __pragma 337 // solution, to avoid some errors flagged in VC++ headers. 338 Builder.defineMacro("_CRT_SECURE_CPP_OVERLOAD_SECURE_NAMES", "0"); 339 } 340 } 341 342 if (LangOpts.Optimize) 343 Builder.defineMacro("__OPTIMIZE__"); 344 if (LangOpts.OptimizeSize) 345 Builder.defineMacro("__OPTIMIZE_SIZE__"); 346 347 // Initialize target-specific preprocessor defines. 348 349 // Define type sizing macros based on the target properties. 350 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 351 Builder.defineMacro("__CHAR_BIT__", "8"); 352 353 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 354 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 355 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 356 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 357 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 358 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 359 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 360 361 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 362 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 363 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 364 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 365 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 366 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 367 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 368 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 369 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 370 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 371 DefineTypeSizeof("__SIZEOF_SIZE_T__", 372 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 373 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 374 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 375 DefineTypeSizeof("__SIZEOF_WINT_T__", 376 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 377 378 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 379 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 380 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 381 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 382 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 383 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 384 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 385 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 386 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 387 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 388 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 389 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 390 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 391 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 392 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 393 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 394 395 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); 396 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); 397 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); 398 399 // Define a __POINTER_WIDTH__ macro for stdint.h. 400 Builder.defineMacro("__POINTER_WIDTH__", 401 llvm::Twine((int)TI.getPointerWidth(0))); 402 403 if (!LangOpts.CharIsSigned) 404 Builder.defineMacro("__CHAR_UNSIGNED__"); 405 406 // Define exact-width integer types for stdint.h 407 Builder.defineMacro("__INT" + llvm::Twine(TI.getCharWidth()) + "_TYPE__", 408 "char"); 409 410 if (TI.getShortWidth() > TI.getCharWidth()) 411 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 412 413 if (TI.getIntWidth() > TI.getShortWidth()) 414 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 415 416 if (TI.getLongWidth() > TI.getIntWidth()) 417 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 418 419 if (TI.getLongLongWidth() > TI.getLongWidth()) 420 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 421 422 // Add __builtin_va_list typedef. 423 Builder.append(TI.getVAListDeclaration()); 424 425 if (const char *Prefix = TI.getUserLabelPrefix()) 426 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 427 428 // Build configuration options. FIXME: these should be controlled by 429 // command line options or something. 430 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 431 432 if (LangOpts.GNUInline) 433 Builder.defineMacro("__GNUC_GNU_INLINE__"); 434 else 435 Builder.defineMacro("__GNUC_STDC_INLINE__"); 436 437 if (LangOpts.NoInline) 438 Builder.defineMacro("__NO_INLINE__"); 439 440 if (unsigned PICLevel = LangOpts.PICLevel) { 441 Builder.defineMacro("__PIC__", llvm::Twine(PICLevel)); 442 Builder.defineMacro("__pic__", llvm::Twine(PICLevel)); 443 } 444 445 // Macros to control C99 numerics and <float.h> 446 Builder.defineMacro("__FLT_EVAL_METHOD__", "0"); 447 Builder.defineMacro("__FLT_RADIX__", "2"); 448 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 449 Builder.defineMacro("__DECIMAL_DIG__", llvm::Twine(Dig)); 450 451 if (LangOpts.getStackProtectorMode() == LangOptions::SSPOn) 452 Builder.defineMacro("__SSP__"); 453 else if (LangOpts.getStackProtectorMode() == LangOptions::SSPReq) 454 Builder.defineMacro("__SSP_ALL__", "2"); 455 456 if (FEOpts.ProgramAction == frontend::RewriteObjC) 457 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 458 459 // Define a macro that exists only when using the static analyzer. 460 if (FEOpts.ProgramAction == frontend::RunAnalysis) 461 Builder.defineMacro("__clang_analyzer__"); 462 463 // Get other target #defines. 464 TI.getTargetDefines(LangOpts, Builder); 465 } 466 467 // Initialize the remapping of files to alternative contents, e.g., 468 // those specified through other files. 469 static void InitializeFileRemapping(Diagnostic &Diags, 470 SourceManager &SourceMgr, 471 FileManager &FileMgr, 472 const PreprocessorOptions &InitOpts) { 473 // Remap files in the source manager (with buffers). 474 for (PreprocessorOptions::remapped_file_buffer_iterator 475 Remap = InitOpts.remapped_file_buffer_begin(), 476 RemapEnd = InitOpts.remapped_file_buffer_end(); 477 Remap != RemapEnd; 478 ++Remap) { 479 // Create the file entry for the file that we're mapping from. 480 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 481 Remap->second->getBufferSize(), 482 0); 483 if (!FromFile) { 484 Diags.Report(diag::err_fe_remap_missing_from_file) 485 << Remap->first; 486 delete Remap->second; 487 continue; 488 } 489 490 // Override the contents of the "from" file with the contents of 491 // the "to" file. 492 SourceMgr.overrideFileContents(FromFile, Remap->second); 493 } 494 495 // Remap files in the source manager (with other files). 496 for (PreprocessorOptions::remapped_file_iterator 497 Remap = InitOpts.remapped_file_begin(), 498 RemapEnd = InitOpts.remapped_file_end(); 499 Remap != RemapEnd; 500 ++Remap) { 501 // Find the file that we're mapping to. 502 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 503 if (!ToFile) { 504 Diags.Report(diag::err_fe_remap_missing_to_file) 505 << Remap->first << Remap->second; 506 continue; 507 } 508 509 // Create the file entry for the file that we're mapping from. 510 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 511 ToFile->getSize(), 512 0); 513 if (!FromFile) { 514 Diags.Report(diag::err_fe_remap_missing_from_file) 515 << Remap->first; 516 continue; 517 } 518 519 // Load the contents of the file we're mapping to. 520 std::string ErrorStr; 521 const llvm::MemoryBuffer *Buffer 522 = llvm::MemoryBuffer::getFile(ToFile->getName(), &ErrorStr); 523 if (!Buffer) { 524 Diags.Report(diag::err_fe_error_opening) 525 << Remap->second << ErrorStr; 526 continue; 527 } 528 529 // Override the contents of the "from" file with the contents of 530 // the "to" file. 531 SourceMgr.overrideFileContents(FromFile, Buffer); 532 } 533 } 534 535 /// InitializePreprocessor - Initialize the preprocessor getting it and the 536 /// environment ready to process a single file. This returns true on error. 537 /// 538 void clang::InitializePreprocessor(Preprocessor &PP, 539 const PreprocessorOptions &InitOpts, 540 const HeaderSearchOptions &HSOpts, 541 const FrontendOptions &FEOpts) { 542 std::string PredefineBuffer; 543 PredefineBuffer.reserve(4080); 544 llvm::raw_string_ostream Predefines(PredefineBuffer); 545 MacroBuilder Builder(Predefines); 546 547 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 548 PP.getFileManager(), InitOpts); 549 550 // Emit line markers for various builtin sections of the file. We don't do 551 // this in asm preprocessor mode, because "# 4" is not a line marker directive 552 // in this mode. 553 if (!PP.getLangOptions().AsmPreprocessor) 554 Builder.append("# 1 \"<built-in>\" 3"); 555 556 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 557 if (InitOpts.UsePredefines) 558 InitializePredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(), 559 FEOpts, Builder); 560 561 // Add on the predefines from the driver. Wrap in a #line directive to report 562 // that they come from the command line. 563 if (!PP.getLangOptions().AsmPreprocessor) 564 Builder.append("# 1 \"<command line>\" 1"); 565 566 // Process #define's and #undef's in the order they are given. 567 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 568 if (InitOpts.Macros[i].second) // isUndef 569 Builder.undefineMacro(InitOpts.Macros[i].first); 570 else 571 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 572 PP.getDiagnostics()); 573 } 574 575 // If -imacros are specified, include them now. These are processed before 576 // any -include directives. 577 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 578 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i]); 579 580 // Process -include directives. 581 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 582 const std::string &Path = InitOpts.Includes[i]; 583 if (Path == InitOpts.ImplicitPTHInclude) 584 AddImplicitIncludePTH(Builder, PP, Path); 585 else 586 AddImplicitInclude(Builder, Path); 587 } 588 589 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 590 if (!PP.getLangOptions().AsmPreprocessor) 591 Builder.append("# 1 \"<built-in>\" 2"); 592 593 // Copy PredefinedBuffer into the Preprocessor. 594 PP.setPredefines(Predefines.str()); 595 596 // Initialize the header search object. 597 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 598 PP.getLangOptions(), 599 PP.getTargetInfo().getTriple()); 600 } 601