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, StringRef Macro, 34 DiagnosticsEngine &Diags) { 35 std::pair<StringRef, StringRef> MacroPair = Macro.split('='); 36 StringRef MacroName = MacroPair.first; 37 StringRef MacroBody = MacroPair.second; 38 if (MacroName.size() != Macro.size()) { 39 // Per GCC -D semantics, the macro ends at \n if it exists. 40 StringRef::size_type End = MacroBody.find_first_of("\n\r"); 41 if (End != 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(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, StringRef File, 74 FileManager &FileMgr) { 75 Builder.append("#include \"" + 76 Twine(NormalizeDashIncludePath(File, FileMgr)) + "\""); 77 } 78 79 static void AddImplicitIncludeMacros(MacroBuilder &Builder, 80 StringRef File, 81 FileManager &FileMgr) { 82 Builder.append("#__include_macros \"" + 83 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 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, 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__", Twine(Digits)); 157 Builder.defineMacro(DefPrefix + "EPSILON__", Twine(Epsilon)); 158 Builder.defineMacro(DefPrefix + "HAS_INFINITY__"); 159 Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__"); 160 Builder.defineMacro(DefPrefix + "MANT_DIG__", Twine(MantissaDigits)); 161 162 Builder.defineMacro(DefPrefix + "MAX_10_EXP__", Twine(Max10Exp)); 163 Builder.defineMacro(DefPrefix + "MAX_EXP__", Twine(MaxExp)); 164 Builder.defineMacro(DefPrefix + "MAX__", Twine(Max)); 165 166 Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+Twine(Min10Exp)+")"); 167 Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+Twine(MinExp)+")"); 168 Builder.defineMacro(DefPrefix + "MIN__", 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(StringRef MacroName, unsigned TypeWidth, 176 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(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 Twine &MacroName, TargetInfo::IntType Ty, 192 MacroBuilder &Builder) { 193 Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty)); 194 } 195 196 static void DefineTypeWidth(StringRef MacroName, TargetInfo::IntType Ty, 197 const TargetInfo &TI, MacroBuilder &Builder) { 198 Builder.defineMacro(MacroName, Twine(TI.getTypeWidth(Ty))); 199 } 200 201 static void DefineTypeSizeof(StringRef MacroName, unsigned BitWidth, 202 const TargetInfo &TI, MacroBuilder &Builder) { 203 Builder.defineMacro(MacroName, 204 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" + Twine(TypeWidth) + "_TYPE__", Ty, Builder); 217 218 StringRef ConstSuffix(TargetInfo::getTypeConstantSuffix(Ty)); 219 if (!ConstSuffix.empty()) 220 Builder.defineMacro("__INT" + Twine(TypeWidth) + "_C_SUFFIX__", 221 ConstSuffix); 222 } 223 224 /// \brief Add definitions required for a smooth interaction between 225 /// Objective-C++ automated reference counting and libstdc++ (4.2). 226 static void AddObjCXXARCLibstdcxxDefines(const LangOptions &LangOpts, 227 MacroBuilder &Builder) { 228 Builder.defineMacro("_GLIBCXX_PREDEFINED_OBJC_ARC_IS_SCALAR"); 229 230 std::string Result; 231 { 232 // Provide specializations for the __is_scalar type trait so that 233 // lifetime-qualified objects are not considered "scalar" types, which 234 // libstdc++ uses as an indicator of the presence of trivial copy, assign, 235 // default-construct, and destruct semantics (none of which hold for 236 // lifetime-qualified objects in ARC). 237 llvm::raw_string_ostream Out(Result); 238 239 Out << "namespace std {\n" 240 << "\n" 241 << "struct __true_type;\n" 242 << "struct __false_type;\n" 243 << "\n"; 244 245 Out << "template<typename _Tp> struct __is_scalar;\n" 246 << "\n"; 247 248 Out << "template<typename _Tp>\n" 249 << "struct __is_scalar<__attribute__((objc_ownership(strong))) _Tp> {\n" 250 << " enum { __value = 0 };\n" 251 << " typedef __false_type __type;\n" 252 << "};\n" 253 << "\n"; 254 255 if (LangOpts.ObjCRuntimeHasWeak) { 256 Out << "template<typename _Tp>\n" 257 << "struct __is_scalar<__attribute__((objc_ownership(weak))) _Tp> {\n" 258 << " enum { __value = 0 };\n" 259 << " typedef __false_type __type;\n" 260 << "};\n" 261 << "\n"; 262 } 263 264 Out << "template<typename _Tp>\n" 265 << "struct __is_scalar<__attribute__((objc_ownership(autoreleasing)))" 266 << " _Tp> {\n" 267 << " enum { __value = 0 };\n" 268 << " typedef __false_type __type;\n" 269 << "};\n" 270 << "\n"; 271 272 Out << "}\n"; 273 } 274 Builder.append(Result); 275 } 276 277 static void InitializeStandardPredefinedMacros(const TargetInfo &TI, 278 const LangOptions &LangOpts, 279 const FrontendOptions &FEOpts, 280 MacroBuilder &Builder) { 281 if (!LangOpts.MicrosoftMode && !LangOpts.TraditionalCPP) 282 Builder.defineMacro("__STDC__"); 283 if (LangOpts.Freestanding) 284 Builder.defineMacro("__STDC_HOSTED__", "0"); 285 else 286 Builder.defineMacro("__STDC_HOSTED__"); 287 288 if (!LangOpts.CPlusPlus) { 289 // FIXME: C1x doesn't have a defined version number yet, so pick something 290 // that is the minimum possible according to their placeholder scheme 291 // 201ymmL. 292 if (LangOpts.C1X) 293 Builder.defineMacro("__STDC_VERSION__", "201001L"); 294 else if (LangOpts.C99) 295 Builder.defineMacro("__STDC_VERSION__", "199901L"); 296 else if (!LangOpts.GNUMode && LangOpts.Digraphs) 297 Builder.defineMacro("__STDC_VERSION__", "199409L"); 298 } else { 299 if (LangOpts.GNUMode) 300 Builder.defineMacro("__cplusplus"); 301 else { 302 // C++0x [cpp.predefined]p1: 303 // The name_ _cplusplus is defined to the value 201103L when compiling a 304 // C++ translation unit. 305 if (LangOpts.CPlusPlus0x) 306 Builder.defineMacro("__cplusplus", "201103L"); 307 // C++03 [cpp.predefined]p1: 308 // The name_ _cplusplus is defined to the value 199711L when compiling a 309 // C++ translation unit. 310 else 311 Builder.defineMacro("__cplusplus", "199711L"); 312 } 313 } 314 315 if (LangOpts.ObjC1) 316 Builder.defineMacro("__OBJC__"); 317 318 // Not "standard" per se, but available even with the -undef flag. 319 if (LangOpts.AsmPreprocessor) 320 Builder.defineMacro("__ASSEMBLER__"); 321 } 322 323 static void InitializePredefinedMacros(const TargetInfo &TI, 324 const LangOptions &LangOpts, 325 const FrontendOptions &FEOpts, 326 MacroBuilder &Builder) { 327 // Compiler version introspection macros. 328 Builder.defineMacro("__llvm__"); // LLVM Backend 329 Builder.defineMacro("__clang__"); // Clang Frontend 330 #define TOSTR2(X) #X 331 #define TOSTR(X) TOSTR2(X) 332 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 333 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 334 #ifdef CLANG_VERSION_PATCHLEVEL 335 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 336 #else 337 Builder.defineMacro("__clang_patchlevel__", "0"); 338 #endif 339 Builder.defineMacro("__clang_version__", 340 "\"" CLANG_VERSION_STRING " (" 341 + getClangFullRepositoryVersion() + ")\""); 342 #undef TOSTR 343 #undef TOSTR2 344 // Currently claim to be compatible with GCC 4.2.1-5621. 345 Builder.defineMacro("__GNUC_MINOR__", "2"); 346 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 347 Builder.defineMacro("__GNUC__", "4"); 348 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 349 350 // As sad as it is, enough software depends on the __VERSION__ for version 351 // checks that it is necessary to report 4.2.1 (the base GCC version we claim 352 // compatibility with) first. 353 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " + 354 Twine(getClangFullCPPVersion()) + "\""); 355 356 // Initialize language-specific preprocessor defines. 357 358 // Standard conforming mode? 359 if (!LangOpts.GNUMode) 360 Builder.defineMacro("__STRICT_ANSI__"); 361 362 if (LangOpts.CPlusPlus0x) 363 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 364 365 if (LangOpts.ObjC1) { 366 if (LangOpts.ObjCNonFragileABI) { 367 Builder.defineMacro("__OBJC2__"); 368 369 if (LangOpts.ObjCExceptions) 370 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 371 } 372 373 if (LangOpts.getGC() != LangOptions::NonGC) 374 Builder.defineMacro("__OBJC_GC__"); 375 376 if (LangOpts.NeXTRuntime) 377 Builder.defineMacro("__NEXT_RUNTIME__"); 378 } 379 380 // darwin_constant_cfstrings controls this. This is also dependent 381 // on other things like the runtime I believe. This is set even for C code. 382 if (!LangOpts.NoConstantCFStrings) 383 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 384 385 if (LangOpts.ObjC2) 386 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 387 388 if (LangOpts.PascalStrings) 389 Builder.defineMacro("__PASCAL_STRINGS__"); 390 391 if (LangOpts.Blocks) { 392 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 393 Builder.defineMacro("__BLOCKS__"); 394 } 395 396 if (LangOpts.CXXExceptions) 397 Builder.defineMacro("__EXCEPTIONS"); 398 if (LangOpts.RTTI) 399 Builder.defineMacro("__GXX_RTTI"); 400 if (LangOpts.SjLjExceptions) 401 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 402 403 if (LangOpts.Deprecated) 404 Builder.defineMacro("__DEPRECATED"); 405 406 if (LangOpts.CPlusPlus) { 407 Builder.defineMacro("__GNUG__", "4"); 408 Builder.defineMacro("__GXX_WEAK__"); 409 Builder.defineMacro("__private_extern__", "extern"); 410 } 411 412 if (LangOpts.MicrosoftExt) { 413 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 414 // VC++ appears to only like __FUNCTION__. 415 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 416 // Work around some issues with Visual C++ headerws. 417 if (LangOpts.CPlusPlus) { 418 // Since we define wchar_t in C++ mode. 419 Builder.defineMacro("_WCHAR_T_DEFINED"); 420 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 421 // FIXME: Support Microsoft's __identifier extension in the lexer. 422 Builder.append("#define __identifier(x) x"); 423 Builder.append("class type_info;"); 424 } 425 426 if (LangOpts.CPlusPlus0x) { 427 Builder.defineMacro("_HAS_CHAR16_T_LANGUAGE_SUPPORT", "1"); 428 } 429 } 430 431 if (LangOpts.Optimize) 432 Builder.defineMacro("__OPTIMIZE__"); 433 if (LangOpts.OptimizeSize) 434 Builder.defineMacro("__OPTIMIZE_SIZE__"); 435 436 // Initialize target-specific preprocessor defines. 437 438 // Define type sizing macros based on the target properties. 439 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 440 Builder.defineMacro("__CHAR_BIT__", "8"); 441 442 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 443 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 444 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 445 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 446 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 447 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 448 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 449 450 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 451 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 452 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 453 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 454 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 455 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 456 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 457 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 458 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 459 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 460 DefineTypeSizeof("__SIZEOF_SIZE_T__", 461 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 462 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 463 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 464 DefineTypeSizeof("__SIZEOF_WINT_T__", 465 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 466 467 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 468 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 469 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 470 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 471 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 472 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 473 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 474 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 475 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 476 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 477 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 478 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 479 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 480 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 481 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 482 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 483 484 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); 485 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); 486 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); 487 488 // Define a __POINTER_WIDTH__ macro for stdint.h. 489 Builder.defineMacro("__POINTER_WIDTH__", 490 Twine((int)TI.getPointerWidth(0))); 491 492 if (!LangOpts.CharIsSigned) 493 Builder.defineMacro("__CHAR_UNSIGNED__"); 494 495 if (!TargetInfo::isTypeSigned(TI.getWIntType())) 496 Builder.defineMacro("__WINT_UNSIGNED__"); 497 498 // Define exact-width integer types for stdint.h 499 Builder.defineMacro("__INT" + Twine(TI.getCharWidth()) + "_TYPE__", 500 "char"); 501 502 if (TI.getShortWidth() > TI.getCharWidth()) 503 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 504 505 if (TI.getIntWidth() > TI.getShortWidth()) 506 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 507 508 if (TI.getLongWidth() > TI.getIntWidth()) 509 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 510 511 if (TI.getLongLongWidth() > TI.getLongWidth()) 512 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 513 514 // Add __builtin_va_list typedef. 515 Builder.append(TI.getVAListDeclaration()); 516 517 if (const char *Prefix = TI.getUserLabelPrefix()) 518 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 519 520 // Build configuration options. FIXME: these should be controlled by 521 // command line options or something. 522 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 523 524 if (LangOpts.GNUInline) 525 Builder.defineMacro("__GNUC_GNU_INLINE__"); 526 else 527 Builder.defineMacro("__GNUC_STDC_INLINE__"); 528 529 if (LangOpts.NoInline) 530 Builder.defineMacro("__NO_INLINE__"); 531 532 if (unsigned PICLevel = LangOpts.PICLevel) { 533 Builder.defineMacro("__PIC__", Twine(PICLevel)); 534 Builder.defineMacro("__pic__", Twine(PICLevel)); 535 } 536 537 // Macros to control C99 numerics and <float.h> 538 Builder.defineMacro("__FLT_EVAL_METHOD__", "0"); 539 Builder.defineMacro("__FLT_RADIX__", "2"); 540 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 541 Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig)); 542 543 if (LangOpts.getStackProtector() == LangOptions::SSPOn) 544 Builder.defineMacro("__SSP__"); 545 else if (LangOpts.getStackProtector() == LangOptions::SSPReq) 546 Builder.defineMacro("__SSP_ALL__", "2"); 547 548 if (FEOpts.ProgramAction == frontend::RewriteObjC) 549 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 550 551 // Define a macro that exists only when using the static analyzer. 552 if (FEOpts.ProgramAction == frontend::RunAnalysis) 553 Builder.defineMacro("__clang_analyzer__"); 554 555 if (LangOpts.FastRelaxedMath) 556 Builder.defineMacro("__FAST_RELAXED_MATH__"); 557 558 if (LangOpts.ObjCAutoRefCount) { 559 Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))"); 560 Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))"); 561 Builder.defineMacro("__autoreleasing", 562 "__attribute__((objc_ownership(autoreleasing)))"); 563 Builder.defineMacro("__unsafe_unretained", 564 "__attribute__((objc_ownership(none)))"); 565 } 566 567 // Get other target #defines. 568 TI.getTargetDefines(LangOpts, Builder); 569 } 570 571 // Initialize the remapping of files to alternative contents, e.g., 572 // those specified through other files. 573 static void InitializeFileRemapping(DiagnosticsEngine &Diags, 574 SourceManager &SourceMgr, 575 FileManager &FileMgr, 576 const PreprocessorOptions &InitOpts) { 577 // Remap files in the source manager (with buffers). 578 for (PreprocessorOptions::const_remapped_file_buffer_iterator 579 Remap = InitOpts.remapped_file_buffer_begin(), 580 RemapEnd = InitOpts.remapped_file_buffer_end(); 581 Remap != RemapEnd; 582 ++Remap) { 583 // Create the file entry for the file that we're mapping from. 584 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 585 Remap->second->getBufferSize(), 586 0); 587 if (!FromFile) { 588 Diags.Report(diag::err_fe_remap_missing_from_file) 589 << Remap->first; 590 if (!InitOpts.RetainRemappedFileBuffers) 591 delete Remap->second; 592 continue; 593 } 594 595 // Override the contents of the "from" file with the contents of 596 // the "to" file. 597 SourceMgr.overrideFileContents(FromFile, Remap->second, 598 InitOpts.RetainRemappedFileBuffers); 599 } 600 601 // Remap files in the source manager (with other files). 602 for (PreprocessorOptions::const_remapped_file_iterator 603 Remap = InitOpts.remapped_file_begin(), 604 RemapEnd = InitOpts.remapped_file_end(); 605 Remap != RemapEnd; 606 ++Remap) { 607 // Find the file that we're mapping to. 608 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 609 if (!ToFile) { 610 Diags.Report(diag::err_fe_remap_missing_to_file) 611 << Remap->first << Remap->second; 612 continue; 613 } 614 615 // Create the file entry for the file that we're mapping from. 616 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 617 ToFile->getSize(), 0); 618 if (!FromFile) { 619 Diags.Report(diag::err_fe_remap_missing_from_file) 620 << Remap->first; 621 continue; 622 } 623 624 // Override the contents of the "from" file with the contents of 625 // the "to" file. 626 SourceMgr.overrideFileContents(FromFile, ToFile); 627 } 628 629 SourceMgr.setOverridenFilesKeepOriginalName( 630 InitOpts.RemappedFilesKeepOriginalName); 631 } 632 633 /// InitializePreprocessor - Initialize the preprocessor getting it and the 634 /// environment ready to process a single file. This returns true on error. 635 /// 636 void clang::InitializePreprocessor(Preprocessor &PP, 637 const PreprocessorOptions &InitOpts, 638 const HeaderSearchOptions &HSOpts, 639 const FrontendOptions &FEOpts) { 640 const LangOptions &LangOpts = PP.getLangOptions(); 641 std::string PredefineBuffer; 642 PredefineBuffer.reserve(4080); 643 llvm::raw_string_ostream Predefines(PredefineBuffer); 644 MacroBuilder Builder(Predefines); 645 646 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 647 PP.getFileManager(), InitOpts); 648 649 // Specify whether the preprocessor should replace #include/#import with 650 // module imports when plausible. 651 PP.setAutoModuleImport(InitOpts.AutoModuleImport); 652 653 // Emit line markers for various builtin sections of the file. We don't do 654 // this in asm preprocessor mode, because "# 4" is not a line marker directive 655 // in this mode. 656 if (!PP.getLangOptions().AsmPreprocessor) 657 Builder.append("# 1 \"<built-in>\" 3"); 658 659 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 660 if (InitOpts.UsePredefines) { 661 InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder); 662 663 // Install definitions to make Objective-C++ ARC work well with various 664 // C++ Standard Library implementations. 665 if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) { 666 switch (InitOpts.ObjCXXARCStandardLibrary) { 667 case ARCXX_nolib: 668 case ARCXX_libcxx: 669 break; 670 671 case ARCXX_libstdcxx: 672 AddObjCXXARCLibstdcxxDefines(LangOpts, Builder); 673 break; 674 } 675 } 676 } 677 678 // Even with predefines off, some macros are still predefined. 679 // These should all be defined in the preprocessor according to the 680 // current language configuration. 681 InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(), 682 FEOpts, Builder); 683 684 // Add on the predefines from the driver. Wrap in a #line directive to report 685 // that they come from the command line. 686 if (!PP.getLangOptions().AsmPreprocessor) 687 Builder.append("# 1 \"<command line>\" 1"); 688 689 // Process #define's and #undef's in the order they are given. 690 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 691 if (InitOpts.Macros[i].second) // isUndef 692 Builder.undefineMacro(InitOpts.Macros[i].first); 693 else 694 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 695 PP.getDiagnostics()); 696 } 697 698 // If -imacros are specified, include them now. These are processed before 699 // any -include directives. 700 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 701 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i], 702 PP.getFileManager()); 703 704 // Process -include directives. 705 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 706 const std::string &Path = InitOpts.Includes[i]; 707 if (Path == InitOpts.ImplicitPTHInclude) 708 AddImplicitIncludePTH(Builder, PP, Path); 709 else 710 AddImplicitInclude(Builder, Path, PP.getFileManager()); 711 } 712 713 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 714 if (!PP.getLangOptions().AsmPreprocessor) 715 Builder.append("# 1 \"<built-in>\" 2"); 716 717 // Instruct the preprocessor to skip the preamble. 718 PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, 719 InitOpts.PrecompiledPreambleBytes.second); 720 721 // Copy PredefinedBuffer into the Preprocessor. 722 PP.setPredefines(Predefines.str()); 723 724 // Initialize the header search object. 725 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 726 PP.getLangOptions(), 727 PP.getTargetInfo().getTriple()); 728 } 729