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