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 // Null check 'P' in the corner case where it couldn't be created. 87 const char *OriginalFile = P ? P->getOriginalSourceFile() : 0; 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 assert(TypeWidth != 1); 174 MaxVal = ~0ULL >> (65-TypeWidth); 175 } else 176 MaxVal = ~0LL >> (64-TypeWidth); 177 178 Builder.defineMacro(MacroName, llvm::Twine(MaxVal) + ValSuffix); 179 } 180 181 /// DefineTypeSize - An overloaded helper that uses TargetInfo to determine 182 /// the width, suffix, and signedness of the given type 183 static void DefineTypeSize(llvm::StringRef MacroName, TargetInfo::IntType Ty, 184 const TargetInfo &TI, MacroBuilder &Builder) { 185 DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty), 186 TI.isTypeSigned(Ty), Builder); 187 } 188 189 static void DefineType(const llvm::Twine &MacroName, TargetInfo::IntType Ty, 190 MacroBuilder &Builder) { 191 Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty)); 192 } 193 194 static void DefineTypeWidth(llvm::StringRef MacroName, TargetInfo::IntType Ty, 195 const TargetInfo &TI, MacroBuilder &Builder) { 196 Builder.defineMacro(MacroName, llvm::Twine(TI.getTypeWidth(Ty))); 197 } 198 199 static void DefineTypeSizeof(llvm::StringRef MacroName, unsigned BitWidth, 200 const TargetInfo &TI, MacroBuilder &Builder) { 201 Builder.defineMacro(MacroName, 202 llvm::Twine(BitWidth / TI.getCharWidth())); 203 } 204 205 static void DefineExactWidthIntType(TargetInfo::IntType Ty, 206 const TargetInfo &TI, MacroBuilder &Builder) { 207 int TypeWidth = TI.getTypeWidth(Ty); 208 209 // Use the target specified int64 type, when appropriate, so that [u]int64_t 210 // ends up being defined in terms of the correct type. 211 if (TypeWidth == 64) 212 Ty = TI.getInt64Type(); 213 214 DefineType("__INT" + llvm::Twine(TypeWidth) + "_TYPE__", Ty, Builder); 215 216 llvm::StringRef ConstSuffix(TargetInfo::getTypeConstantSuffix(Ty)); 217 if (!ConstSuffix.empty()) 218 Builder.defineMacro("__INT" + llvm::Twine(TypeWidth) + "_C_SUFFIX__", 219 ConstSuffix); 220 } 221 222 static void InitializePredefinedMacros(const TargetInfo &TI, 223 const LangOptions &LangOpts, 224 const FrontendOptions &FEOpts, 225 MacroBuilder &Builder) { 226 // Compiler version introspection macros. 227 Builder.defineMacro("__llvm__"); // LLVM Backend 228 Builder.defineMacro("__clang__"); // Clang Frontend 229 #define TOSTR2(X) #X 230 #define TOSTR(X) TOSTR2(X) 231 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 232 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 233 #ifdef CLANG_VERSION_PATCHLEVEL 234 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 235 #else 236 Builder.defineMacro("__clang_patchlevel__", "0"); 237 #endif 238 Builder.defineMacro("__clang_version__", 239 "\"" CLANG_VERSION_STRING " (" 240 + getClangFullRepositoryVersion() + ")\""); 241 #undef TOSTR 242 #undef TOSTR2 243 // Currently claim to be compatible with GCC 4.2.1-5621. 244 Builder.defineMacro("__GNUC_MINOR__", "2"); 245 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 246 Builder.defineMacro("__GNUC__", "4"); 247 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 248 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible Clang Compiler\""); 249 250 // Initialize language-specific preprocessor defines. 251 252 // These should all be defined in the preprocessor according to the 253 // current language configuration. 254 if (!LangOpts.Microsoft) 255 Builder.defineMacro("__STDC__"); 256 if (LangOpts.AsmPreprocessor) 257 Builder.defineMacro("__ASSEMBLER__"); 258 259 if (!LangOpts.CPlusPlus) { 260 if (LangOpts.C99) 261 Builder.defineMacro("__STDC_VERSION__", "199901L"); 262 else if (!LangOpts.GNUMode && LangOpts.Digraphs) 263 Builder.defineMacro("__STDC_VERSION__", "199409L"); 264 } 265 266 // Standard conforming mode? 267 if (!LangOpts.GNUMode) 268 Builder.defineMacro("__STRICT_ANSI__"); 269 270 if (LangOpts.CPlusPlus0x) 271 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 272 273 if (LangOpts.Freestanding) 274 Builder.defineMacro("__STDC_HOSTED__", "0"); 275 else 276 Builder.defineMacro("__STDC_HOSTED__"); 277 278 if (LangOpts.ObjC1) { 279 Builder.defineMacro("__OBJC__"); 280 if (LangOpts.ObjCNonFragileABI) { 281 Builder.defineMacro("__OBJC2__"); 282 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 283 } 284 285 if (LangOpts.getGCMode() != LangOptions::NonGC) 286 Builder.defineMacro("__OBJC_GC__"); 287 288 if (LangOpts.NeXTRuntime) 289 Builder.defineMacro("__NEXT_RUNTIME__"); 290 } 291 292 // darwin_constant_cfstrings controls this. This is also dependent 293 // on other things like the runtime I believe. This is set even for C code. 294 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 295 296 if (LangOpts.ObjC2) 297 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 298 299 if (LangOpts.PascalStrings) 300 Builder.defineMacro("__PASCAL_STRINGS__"); 301 302 if (LangOpts.Blocks) { 303 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 304 Builder.defineMacro("__BLOCKS__"); 305 } 306 307 if (LangOpts.Exceptions) 308 Builder.defineMacro("__EXCEPTIONS"); 309 if (LangOpts.RTTI) 310 Builder.defineMacro("__GXX_RTTI"); 311 if (LangOpts.SjLjExceptions) 312 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 313 314 if (LangOpts.CPlusPlus) { 315 Builder.defineMacro("__DEPRECATED"); 316 Builder.defineMacro("__GNUG__", "4"); 317 Builder.defineMacro("__GXX_WEAK__"); 318 if (LangOpts.GNUMode) 319 Builder.defineMacro("__cplusplus"); 320 else 321 // C++ [cpp.predefined]p1: 322 // The name_ _cplusplusis defined to the value199711Lwhen compiling a 323 // C++ translation unit. 324 Builder.defineMacro("__cplusplus", "199711L"); 325 Builder.defineMacro("__private_extern__", "extern"); 326 } 327 328 if (LangOpts.Microsoft) { 329 // Filter out some microsoft extensions when trying to parse in ms-compat 330 // mode. 331 Builder.defineMacro("__int8", "__INT8_TYPE__"); 332 Builder.defineMacro("__int16", "__INT16_TYPE__"); 333 Builder.defineMacro("__int32", "__INT32_TYPE__"); 334 Builder.defineMacro("__int64", "__INT64_TYPE__"); 335 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 336 // VC++ appears to only like __FUNCTION__. 337 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 338 // Work around some issues with Visual C++ headerws. 339 if (LangOpts.CPlusPlus) { 340 // Since we define wchar_t in C++ mode. 341 Builder.defineMacro("_WCHAR_T_DEFINED"); 342 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 343 // FIXME: This should be temporary until we have a __pragma 344 // solution, to avoid some errors flagged in VC++ headers. 345 Builder.defineMacro("_CRT_SECURE_CPP_OVERLOAD_SECURE_NAMES", "0"); 346 } 347 } 348 349 if (LangOpts.Optimize) 350 Builder.defineMacro("__OPTIMIZE__"); 351 if (LangOpts.OptimizeSize) 352 Builder.defineMacro("__OPTIMIZE_SIZE__"); 353 354 // Initialize target-specific preprocessor defines. 355 356 // Define type sizing macros based on the target properties. 357 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 358 Builder.defineMacro("__CHAR_BIT__", "8"); 359 360 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 361 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 362 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 363 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 364 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 365 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 366 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 367 368 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 369 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 370 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 371 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 372 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 373 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 374 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 375 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 376 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 377 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 378 DefineTypeSizeof("__SIZEOF_SIZE_T__", 379 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 380 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 381 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 382 DefineTypeSizeof("__SIZEOF_WINT_T__", 383 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 384 385 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 386 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 387 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 388 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 389 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 390 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 391 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 392 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 393 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 394 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 395 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 396 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 397 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 398 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 399 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 400 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 401 402 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); 403 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); 404 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); 405 406 // Define a __POINTER_WIDTH__ macro for stdint.h. 407 Builder.defineMacro("__POINTER_WIDTH__", 408 llvm::Twine((int)TI.getPointerWidth(0))); 409 410 if (!LangOpts.CharIsSigned) 411 Builder.defineMacro("__CHAR_UNSIGNED__"); 412 413 // Define exact-width integer types for stdint.h 414 Builder.defineMacro("__INT" + llvm::Twine(TI.getCharWidth()) + "_TYPE__", 415 "char"); 416 417 if (TI.getShortWidth() > TI.getCharWidth()) 418 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 419 420 if (TI.getIntWidth() > TI.getShortWidth()) 421 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 422 423 if (TI.getLongWidth() > TI.getIntWidth()) 424 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 425 426 if (TI.getLongLongWidth() > TI.getLongWidth()) 427 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 428 429 // Add __builtin_va_list typedef. 430 Builder.append(TI.getVAListDeclaration()); 431 432 if (const char *Prefix = TI.getUserLabelPrefix()) 433 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 434 435 // Build configuration options. FIXME: these should be controlled by 436 // command line options or something. 437 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 438 439 if (LangOpts.GNUInline) 440 Builder.defineMacro("__GNUC_GNU_INLINE__"); 441 else 442 Builder.defineMacro("__GNUC_STDC_INLINE__"); 443 444 if (LangOpts.NoInline) 445 Builder.defineMacro("__NO_INLINE__"); 446 447 if (unsigned PICLevel = LangOpts.PICLevel) { 448 Builder.defineMacro("__PIC__", llvm::Twine(PICLevel)); 449 Builder.defineMacro("__pic__", llvm::Twine(PICLevel)); 450 } 451 452 // Macros to control C99 numerics and <float.h> 453 Builder.defineMacro("__FLT_EVAL_METHOD__", "0"); 454 Builder.defineMacro("__FLT_RADIX__", "2"); 455 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 456 Builder.defineMacro("__DECIMAL_DIG__", llvm::Twine(Dig)); 457 458 if (LangOpts.getStackProtectorMode() == LangOptions::SSPOn) 459 Builder.defineMacro("__SSP__"); 460 else if (LangOpts.getStackProtectorMode() == LangOptions::SSPReq) 461 Builder.defineMacro("__SSP_ALL__", "2"); 462 463 if (FEOpts.ProgramAction == frontend::RewriteObjC) 464 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 465 466 // Define a macro that exists only when using the static analyzer. 467 if (FEOpts.ProgramAction == frontend::RunAnalysis) 468 Builder.defineMacro("__clang_analyzer__"); 469 470 // Get other target #defines. 471 TI.getTargetDefines(LangOpts, Builder); 472 } 473 474 // Initialize the remapping of files to alternative contents, e.g., 475 // those specified through other files. 476 static void InitializeFileRemapping(Diagnostic &Diags, 477 SourceManager &SourceMgr, 478 FileManager &FileMgr, 479 const PreprocessorOptions &InitOpts) { 480 // Remap files in the source manager (with buffers). 481 for (PreprocessorOptions::const_remapped_file_buffer_iterator 482 Remap = InitOpts.remapped_file_buffer_begin(), 483 RemapEnd = InitOpts.remapped_file_buffer_end(); 484 Remap != RemapEnd; 485 ++Remap) { 486 // Create the file entry for the file that we're mapping from. 487 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 488 Remap->second->getBufferSize(), 489 0); 490 if (!FromFile) { 491 Diags.Report(diag::err_fe_remap_missing_from_file) 492 << Remap->first; 493 if (!InitOpts.RetainRemappedFileBuffers) 494 delete Remap->second; 495 continue; 496 } 497 498 // Override the contents of the "from" file with the contents of 499 // the "to" file. 500 SourceMgr.overrideFileContents(FromFile, Remap->second, 501 InitOpts.RetainRemappedFileBuffers); 502 } 503 504 // Remap files in the source manager (with other files). 505 for (PreprocessorOptions::const_remapped_file_iterator 506 Remap = InitOpts.remapped_file_begin(), 507 RemapEnd = InitOpts.remapped_file_end(); 508 Remap != RemapEnd; 509 ++Remap) { 510 // Find the file that we're mapping to. 511 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 512 if (!ToFile) { 513 Diags.Report(diag::err_fe_remap_missing_to_file) 514 << Remap->first << Remap->second; 515 continue; 516 } 517 518 // Create the file entry for the file that we're mapping from. 519 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 520 ToFile->getSize(), 521 0); 522 if (!FromFile) { 523 Diags.Report(diag::err_fe_remap_missing_from_file) 524 << Remap->first; 525 continue; 526 } 527 528 // Load the contents of the file we're mapping to. 529 std::string ErrorStr; 530 const llvm::MemoryBuffer *Buffer 531 = llvm::MemoryBuffer::getFile(ToFile->getName(), &ErrorStr); 532 if (!Buffer) { 533 Diags.Report(diag::err_fe_error_opening) 534 << Remap->second << ErrorStr; 535 continue; 536 } 537 538 // Override the contents of the "from" file with the contents of 539 // the "to" file. 540 SourceMgr.overrideFileContents(FromFile, Buffer); 541 } 542 } 543 544 /// InitializePreprocessor - Initialize the preprocessor getting it and the 545 /// environment ready to process a single file. This returns true on error. 546 /// 547 void clang::InitializePreprocessor(Preprocessor &PP, 548 const PreprocessorOptions &InitOpts, 549 const HeaderSearchOptions &HSOpts, 550 const FrontendOptions &FEOpts) { 551 std::string PredefineBuffer; 552 PredefineBuffer.reserve(4080); 553 llvm::raw_string_ostream Predefines(PredefineBuffer); 554 MacroBuilder Builder(Predefines); 555 556 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 557 PP.getFileManager(), InitOpts); 558 559 // Emit line markers for various builtin sections of the file. We don't do 560 // this in asm preprocessor mode, because "# 4" is not a line marker directive 561 // in this mode. 562 if (!PP.getLangOptions().AsmPreprocessor) 563 Builder.append("# 1 \"<built-in>\" 3"); 564 565 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 566 if (InitOpts.UsePredefines) 567 InitializePredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(), 568 FEOpts, Builder); 569 570 // Add on the predefines from the driver. Wrap in a #line directive to report 571 // that they come from the command line. 572 if (!PP.getLangOptions().AsmPreprocessor) 573 Builder.append("# 1 \"<command line>\" 1"); 574 575 // Process #define's and #undef's in the order they are given. 576 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 577 if (InitOpts.Macros[i].second) // isUndef 578 Builder.undefineMacro(InitOpts.Macros[i].first); 579 else 580 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 581 PP.getDiagnostics()); 582 } 583 584 // If -imacros are specified, include them now. These are processed before 585 // any -include directives. 586 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 587 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i]); 588 589 // Process -include directives. 590 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 591 const std::string &Path = InitOpts.Includes[i]; 592 if (Path == InitOpts.ImplicitPTHInclude) 593 AddImplicitIncludePTH(Builder, PP, Path); 594 else 595 AddImplicitInclude(Builder, Path); 596 } 597 598 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 599 if (!PP.getLangOptions().AsmPreprocessor) 600 Builder.append("# 1 \"<built-in>\" 2"); 601 602 // Instruct the preprocessor to skip the preamble. 603 PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, 604 InitOpts.PrecompiledPreambleBytes.second); 605 606 // Copy PredefinedBuffer into the Preprocessor. 607 PP.setPredefines(Predefines.str()); 608 609 // Initialize the header search object. 610 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 611 PP.getLangOptions(), 612 PP.getTargetInfo().getTriple()); 613 } 614