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/HeaderSearch.h" 22 #include "clang/Lex/Preprocessor.h" 23 #include "clang/Basic/FileManager.h" 24 #include "clang/Basic/SourceManager.h" 25 #include "llvm/ADT/APFloat.h" 26 #include "llvm/Support/FileSystem.h" 27 #include "llvm/Support/MemoryBuffer.h" 28 #include "llvm/Support/Path.h" 29 using namespace clang; 30 31 // Append a #define line to Buf for Macro. Macro should be of the form XXX, 32 // in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit 33 // "#define XXX Y z W". To get a #define with no value, use "XXX=". 34 static void DefineBuiltinMacro(MacroBuilder &Builder, StringRef Macro, 35 DiagnosticsEngine &Diags) { 36 std::pair<StringRef, StringRef> MacroPair = Macro.split('='); 37 StringRef MacroName = MacroPair.first; 38 StringRef MacroBody = MacroPair.second; 39 if (MacroName.size() != Macro.size()) { 40 // Per GCC -D semantics, the macro ends at \n if it exists. 41 StringRef::size_type End = MacroBody.find_first_of("\n\r"); 42 if (End != StringRef::npos) 43 Diags.Report(diag::warn_fe_macro_contains_embedded_newline) 44 << MacroName; 45 Builder.defineMacro(MacroName, MacroBody.substr(0, End)); 46 } else { 47 // Push "macroname 1". 48 Builder.defineMacro(Macro); 49 } 50 } 51 52 /// AddImplicitInclude - Add an implicit \#include of the specified file to the 53 /// predefines buffer. 54 static void AddImplicitInclude(MacroBuilder &Builder, StringRef File, 55 FileManager &FileMgr) { 56 Builder.append(Twine("#include \"") + 57 HeaderSearch::NormalizeDashIncludePath(File, FileMgr) + "\""); 58 } 59 60 static void AddImplicitIncludeMacros(MacroBuilder &Builder, 61 StringRef File, 62 FileManager &FileMgr) { 63 Builder.append(Twine("#__include_macros \"") + 64 HeaderSearch::NormalizeDashIncludePath(File, FileMgr) + "\""); 65 // Marker token to stop the __include_macros fetch loop. 66 Builder.append("##"); // ##? 67 } 68 69 /// AddImplicitIncludePTH - Add an implicit \#include using the original file 70 /// used to generate a PTH cache. 71 static void AddImplicitIncludePTH(MacroBuilder &Builder, Preprocessor &PP, 72 StringRef ImplicitIncludePTH) { 73 PTHManager *P = PP.getPTHManager(); 74 // Null check 'P' in the corner case where it couldn't be created. 75 const char *OriginalFile = P ? P->getOriginalSourceFile() : 0; 76 77 if (!OriginalFile) { 78 PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header) 79 << ImplicitIncludePTH; 80 return; 81 } 82 83 AddImplicitInclude(Builder, OriginalFile, PP.getFileManager()); 84 } 85 86 /// PickFP - This is used to pick a value based on the FP semantics of the 87 /// specified FP model. 88 template <typename T> 89 static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, 90 T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal, 91 T IEEEQuadVal) { 92 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle) 93 return IEEESingleVal; 94 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble) 95 return IEEEDoubleVal; 96 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended) 97 return X87DoubleExtendedVal; 98 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble) 99 return PPCDoubleDoubleVal; 100 assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad); 101 return IEEEQuadVal; 102 } 103 104 static void DefineFloatMacros(MacroBuilder &Builder, StringRef Prefix, 105 const llvm::fltSemantics *Sem) { 106 const char *DenormMin, *Epsilon, *Max, *Min; 107 DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324", 108 "3.64519953188247460253e-4951L", 109 "4.94065645841246544176568792868221e-324L", 110 "6.47517511943802511092443895822764655e-4966L"); 111 int Digits = PickFP(Sem, 6, 15, 18, 31, 33); 112 Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16", 113 "1.08420217248550443401e-19L", 114 "4.94065645841246544176568792868221e-324L", 115 "1.92592994438723585305597794258492732e-34L"); 116 int MantissaDigits = PickFP(Sem, 24, 53, 64, 106, 113); 117 int Min10Exp = PickFP(Sem, -37, -307, -4931, -291, -4931); 118 int Max10Exp = PickFP(Sem, 38, 308, 4932, 308, 4932); 119 int MinExp = PickFP(Sem, -125, -1021, -16381, -968, -16381); 120 int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024, 16384); 121 Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308", 122 "3.36210314311209350626e-4932L", 123 "2.00416836000897277799610805135016e-292L", 124 "3.36210314311209350626267781732175260e-4932L"); 125 Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308", 126 "1.18973149535723176502e+4932L", 127 "1.79769313486231580793728971405301e+308L", 128 "1.18973149535723176508575932662800702e+4932L"); 129 130 SmallString<32> DefPrefix; 131 DefPrefix = "__"; 132 DefPrefix += Prefix; 133 DefPrefix += "_"; 134 135 Builder.defineMacro(DefPrefix + "DENORM_MIN__", DenormMin); 136 Builder.defineMacro(DefPrefix + "HAS_DENORM__"); 137 Builder.defineMacro(DefPrefix + "DIG__", Twine(Digits)); 138 Builder.defineMacro(DefPrefix + "EPSILON__", Twine(Epsilon)); 139 Builder.defineMacro(DefPrefix + "HAS_INFINITY__"); 140 Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__"); 141 Builder.defineMacro(DefPrefix + "MANT_DIG__", Twine(MantissaDigits)); 142 143 Builder.defineMacro(DefPrefix + "MAX_10_EXP__", Twine(Max10Exp)); 144 Builder.defineMacro(DefPrefix + "MAX_EXP__", Twine(MaxExp)); 145 Builder.defineMacro(DefPrefix + "MAX__", Twine(Max)); 146 147 Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+Twine(Min10Exp)+")"); 148 Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+Twine(MinExp)+")"); 149 Builder.defineMacro(DefPrefix + "MIN__", Twine(Min)); 150 } 151 152 153 /// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro 154 /// named MacroName with the max value for a type with width 'TypeWidth' a 155 /// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL). 156 static void DefineTypeSize(StringRef MacroName, unsigned TypeWidth, 157 StringRef ValSuffix, bool isSigned, 158 MacroBuilder &Builder) { 159 llvm::APInt MaxVal = isSigned ? llvm::APInt::getSignedMaxValue(TypeWidth) 160 : llvm::APInt::getMaxValue(TypeWidth); 161 Builder.defineMacro(MacroName, MaxVal.toString(10, isSigned) + ValSuffix); 162 } 163 164 /// DefineTypeSize - An overloaded helper that uses TargetInfo to determine 165 /// the width, suffix, and signedness of the given type 166 static void DefineTypeSize(StringRef MacroName, TargetInfo::IntType Ty, 167 const TargetInfo &TI, MacroBuilder &Builder) { 168 DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty), 169 TI.isTypeSigned(Ty), Builder); 170 } 171 172 static void DefineType(const Twine &MacroName, TargetInfo::IntType Ty, 173 MacroBuilder &Builder) { 174 Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty)); 175 } 176 177 static void DefineTypeWidth(StringRef MacroName, TargetInfo::IntType Ty, 178 const TargetInfo &TI, MacroBuilder &Builder) { 179 Builder.defineMacro(MacroName, Twine(TI.getTypeWidth(Ty))); 180 } 181 182 static void DefineTypeSizeof(StringRef MacroName, unsigned BitWidth, 183 const TargetInfo &TI, MacroBuilder &Builder) { 184 Builder.defineMacro(MacroName, 185 Twine(BitWidth / TI.getCharWidth())); 186 } 187 188 static void DefineExactWidthIntType(TargetInfo::IntType Ty, 189 const TargetInfo &TI, MacroBuilder &Builder) { 190 int TypeWidth = TI.getTypeWidth(Ty); 191 192 // Use the target specified int64 type, when appropriate, so that [u]int64_t 193 // ends up being defined in terms of the correct type. 194 if (TypeWidth == 64) 195 Ty = TI.getInt64Type(); 196 197 DefineType("__INT" + Twine(TypeWidth) + "_TYPE__", Ty, Builder); 198 199 StringRef ConstSuffix(TargetInfo::getTypeConstantSuffix(Ty)); 200 if (!ConstSuffix.empty()) 201 Builder.defineMacro("__INT" + Twine(TypeWidth) + "_C_SUFFIX__", 202 ConstSuffix); 203 } 204 205 /// Get the value the ATOMIC_*_LOCK_FREE macro should have for a type with 206 /// the specified properties. 207 static const char *getLockFreeValue(unsigned TypeWidth, unsigned TypeAlign, 208 unsigned InlineWidth) { 209 // Fully-aligned, power-of-2 sizes no larger than the inline 210 // width will be inlined as lock-free operations. 211 if (TypeWidth == TypeAlign && (TypeWidth & (TypeWidth - 1)) == 0 && 212 TypeWidth <= InlineWidth) 213 return "2"; // "always lock free" 214 // We cannot be certain what operations the lib calls might be 215 // able to implement as lock-free on future processors. 216 return "1"; // "sometimes lock free" 217 } 218 219 /// \brief Add definitions required for a smooth interaction between 220 /// Objective-C++ automated reference counting and libstdc++ (4.2). 221 static void AddObjCXXARCLibstdcxxDefines(const LangOptions &LangOpts, 222 MacroBuilder &Builder) { 223 Builder.defineMacro("_GLIBCXX_PREDEFINED_OBJC_ARC_IS_SCALAR"); 224 225 std::string Result; 226 { 227 // Provide specializations for the __is_scalar type trait so that 228 // lifetime-qualified objects are not considered "scalar" types, which 229 // libstdc++ uses as an indicator of the presence of trivial copy, assign, 230 // default-construct, and destruct semantics (none of which hold for 231 // lifetime-qualified objects in ARC). 232 llvm::raw_string_ostream Out(Result); 233 234 Out << "namespace std {\n" 235 << "\n" 236 << "struct __true_type;\n" 237 << "struct __false_type;\n" 238 << "\n"; 239 240 Out << "template<typename _Tp> struct __is_scalar;\n" 241 << "\n"; 242 243 Out << "template<typename _Tp>\n" 244 << "struct __is_scalar<__attribute__((objc_ownership(strong))) _Tp> {\n" 245 << " enum { __value = 0 };\n" 246 << " typedef __false_type __type;\n" 247 << "};\n" 248 << "\n"; 249 250 if (LangOpts.ObjCARCWeak) { 251 Out << "template<typename _Tp>\n" 252 << "struct __is_scalar<__attribute__((objc_ownership(weak))) _Tp> {\n" 253 << " enum { __value = 0 };\n" 254 << " typedef __false_type __type;\n" 255 << "};\n" 256 << "\n"; 257 } 258 259 Out << "template<typename _Tp>\n" 260 << "struct __is_scalar<__attribute__((objc_ownership(autoreleasing)))" 261 << " _Tp> {\n" 262 << " enum { __value = 0 };\n" 263 << " typedef __false_type __type;\n" 264 << "};\n" 265 << "\n"; 266 267 Out << "}\n"; 268 } 269 Builder.append(Result); 270 } 271 272 static void InitializeStandardPredefinedMacros(const TargetInfo &TI, 273 const LangOptions &LangOpts, 274 const FrontendOptions &FEOpts, 275 MacroBuilder &Builder) { 276 if (!LangOpts.MicrosoftMode && !LangOpts.TraditionalCPP) 277 Builder.defineMacro("__STDC__"); 278 if (LangOpts.Freestanding) 279 Builder.defineMacro("__STDC_HOSTED__", "0"); 280 else 281 Builder.defineMacro("__STDC_HOSTED__"); 282 283 if (!LangOpts.CPlusPlus) { 284 if (LangOpts.C11) 285 Builder.defineMacro("__STDC_VERSION__", "201112L"); 286 else if (LangOpts.C99) 287 Builder.defineMacro("__STDC_VERSION__", "199901L"); 288 else if (!LangOpts.GNUMode && LangOpts.Digraphs) 289 Builder.defineMacro("__STDC_VERSION__", "199409L"); 290 } else { 291 // C++11 [cpp.predefined]p1: 292 // The name __cplusplus is defined to the value 201103L when compiling a 293 // C++ translation unit. 294 if (LangOpts.CPlusPlus0x) 295 Builder.defineMacro("__cplusplus", "201103L"); 296 // C++03 [cpp.predefined]p1: 297 // The name __cplusplus is defined to the value 199711L when compiling a 298 // C++ translation unit. 299 else 300 Builder.defineMacro("__cplusplus", "199711L"); 301 } 302 303 if (LangOpts.ObjC1) 304 Builder.defineMacro("__OBJC__"); 305 306 // Not "standard" per se, but available even with the -undef flag. 307 if (LangOpts.AsmPreprocessor) 308 Builder.defineMacro("__ASSEMBLER__"); 309 } 310 311 static void InitializePredefinedMacros(const TargetInfo &TI, 312 const LangOptions &LangOpts, 313 const FrontendOptions &FEOpts, 314 MacroBuilder &Builder) { 315 // Compiler version introspection macros. 316 Builder.defineMacro("__llvm__"); // LLVM Backend 317 Builder.defineMacro("__clang__"); // Clang Frontend 318 #define TOSTR2(X) #X 319 #define TOSTR(X) TOSTR2(X) 320 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 321 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 322 #ifdef CLANG_VERSION_PATCHLEVEL 323 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 324 #else 325 Builder.defineMacro("__clang_patchlevel__", "0"); 326 #endif 327 Builder.defineMacro("__clang_version__", 328 "\"" CLANG_VERSION_STRING " (" 329 + getClangFullRepositoryVersion() + ")\""); 330 #undef TOSTR 331 #undef TOSTR2 332 if (!LangOpts.MicrosoftMode) { 333 // Currently claim to be compatible with GCC 4.2.1-5621, but only if we're 334 // not compiling for MSVC compatibility 335 Builder.defineMacro("__GNUC_MINOR__", "2"); 336 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 337 Builder.defineMacro("__GNUC__", "4"); 338 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 339 } 340 341 // Define macros for the C11 / C++11 memory orderings 342 Builder.defineMacro("__ATOMIC_RELAXED", "0"); 343 Builder.defineMacro("__ATOMIC_CONSUME", "1"); 344 Builder.defineMacro("__ATOMIC_ACQUIRE", "2"); 345 Builder.defineMacro("__ATOMIC_RELEASE", "3"); 346 Builder.defineMacro("__ATOMIC_ACQ_REL", "4"); 347 Builder.defineMacro("__ATOMIC_SEQ_CST", "5"); 348 349 // Support for #pragma redefine_extname (Sun compatibility) 350 Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1"); 351 352 // As sad as it is, enough software depends on the __VERSION__ for version 353 // checks that it is necessary to report 4.2.1 (the base GCC version we claim 354 // compatibility with) first. 355 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " + 356 Twine(getClangFullCPPVersion()) + "\""); 357 358 // Initialize language-specific preprocessor defines. 359 360 // Standard conforming mode? 361 if (!LangOpts.GNUMode) 362 Builder.defineMacro("__STRICT_ANSI__"); 363 364 if (LangOpts.CPlusPlus0x) 365 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 366 367 if (LangOpts.ObjC1) { 368 if (LangOpts.ObjCRuntime.isNonFragile()) { 369 Builder.defineMacro("__OBJC2__"); 370 371 if (LangOpts.ObjCExceptions) 372 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 373 } 374 375 if (LangOpts.getGC() != LangOptions::NonGC) 376 Builder.defineMacro("__OBJC_GC__"); 377 378 if (LangOpts.ObjCRuntime.isNeXTFamily()) 379 Builder.defineMacro("__NEXT_RUNTIME__"); 380 381 Builder.defineMacro("IBOutlet", "__attribute__((iboutlet))"); 382 Builder.defineMacro("IBOutletCollection(ClassName)", 383 "__attribute__((iboutletcollection(ClassName)))"); 384 Builder.defineMacro("IBAction", "void)__attribute__((ibaction)"); 385 } 386 387 // darwin_constant_cfstrings controls this. This is also dependent 388 // on other things like the runtime I believe. This is set even for C code. 389 if (!LangOpts.NoConstantCFStrings) 390 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 391 392 if (LangOpts.ObjC2) 393 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 394 395 if (LangOpts.PascalStrings) 396 Builder.defineMacro("__PASCAL_STRINGS__"); 397 398 if (LangOpts.Blocks) { 399 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 400 Builder.defineMacro("__BLOCKS__"); 401 } 402 403 if (LangOpts.CXXExceptions) 404 Builder.defineMacro("__EXCEPTIONS"); 405 if (LangOpts.RTTI) 406 Builder.defineMacro("__GXX_RTTI"); 407 if (LangOpts.SjLjExceptions) 408 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 409 410 if (LangOpts.Deprecated) 411 Builder.defineMacro("__DEPRECATED"); 412 413 if (LangOpts.CPlusPlus) { 414 Builder.defineMacro("__GNUG__", "4"); 415 Builder.defineMacro("__GXX_WEAK__"); 416 Builder.defineMacro("__private_extern__", "extern"); 417 } 418 419 if (LangOpts.MicrosoftExt) { 420 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 421 // VC++ appears to only like __FUNCTION__. 422 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 423 // Work around some issues with Visual C++ headerws. 424 if (LangOpts.CPlusPlus) { 425 // Since we define wchar_t in C++ mode. 426 Builder.defineMacro("_WCHAR_T_DEFINED"); 427 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 428 // FIXME: Support Microsoft's __identifier extension in the lexer. 429 Builder.append("#define __identifier(x) x"); 430 Builder.append("class type_info;"); 431 } 432 } 433 434 if (LangOpts.Optimize) 435 Builder.defineMacro("__OPTIMIZE__"); 436 if (LangOpts.OptimizeSize) 437 Builder.defineMacro("__OPTIMIZE_SIZE__"); 438 439 if (LangOpts.FastMath) 440 Builder.defineMacro("__FAST_MATH__"); 441 442 // Initialize target-specific preprocessor defines. 443 444 // __BYTE_ORDER__ was added in GCC 4.6. It's analogous 445 // to the macro __BYTE_ORDER (no trailing underscores) 446 // from glibc's <endian.h> header. 447 // We don't support the PDP-11 as a target, but include 448 // the define so it can still be compared against. 449 Builder.defineMacro("__ORDER_LITTLE_ENDIAN__", "1234"); 450 Builder.defineMacro("__ORDER_BIG_ENDIAN__", "4321"); 451 Builder.defineMacro("__ORDER_PDP_ENDIAN__", "3412"); 452 if (TI.isBigEndian()) 453 Builder.defineMacro("__BYTE_ORDER__", "__ORDER_BIG_ENDIAN__"); 454 else 455 Builder.defineMacro("__BYTE_ORDER__", "__ORDER_LITTLE_ENDIAN__"); 456 457 458 if (TI.getPointerWidth(0) == 64 && TI.getLongWidth() == 64 459 && TI.getIntWidth() == 32) { 460 Builder.defineMacro("_LP64"); 461 Builder.defineMacro("__LP64__"); 462 } 463 464 // Define type sizing macros based on the target properties. 465 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 466 Builder.defineMacro("__CHAR_BIT__", "8"); 467 468 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 469 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 470 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 471 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 472 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 473 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 474 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 475 476 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 477 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 478 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 479 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 480 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 481 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 482 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 483 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 484 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 485 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 486 DefineTypeSizeof("__SIZEOF_SIZE_T__", 487 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 488 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 489 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 490 DefineTypeSizeof("__SIZEOF_WINT_T__", 491 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 492 493 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 494 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 495 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 496 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 497 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 498 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 499 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 500 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 501 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 502 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 503 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 504 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 505 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 506 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 507 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 508 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 509 510 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); 511 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); 512 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); 513 514 // Define a __POINTER_WIDTH__ macro for stdint.h. 515 Builder.defineMacro("__POINTER_WIDTH__", 516 Twine((int)TI.getPointerWidth(0))); 517 518 if (!LangOpts.CharIsSigned) 519 Builder.defineMacro("__CHAR_UNSIGNED__"); 520 521 if (!TargetInfo::isTypeSigned(TI.getWCharType())) 522 Builder.defineMacro("__WCHAR_UNSIGNED__"); 523 524 if (!TargetInfo::isTypeSigned(TI.getWIntType())) 525 Builder.defineMacro("__WINT_UNSIGNED__"); 526 527 // Define exact-width integer types for stdint.h 528 Builder.defineMacro("__INT" + Twine(TI.getCharWidth()) + "_TYPE__", 529 "char"); 530 531 if (TI.getShortWidth() > TI.getCharWidth()) 532 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 533 534 if (TI.getIntWidth() > TI.getShortWidth()) 535 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 536 537 if (TI.getLongWidth() > TI.getIntWidth()) 538 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 539 540 if (TI.getLongLongWidth() > TI.getLongWidth()) 541 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 542 543 if (const char *Prefix = TI.getUserLabelPrefix()) 544 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 545 546 if (LangOpts.FastMath || LangOpts.FiniteMathOnly) 547 Builder.defineMacro("__FINITE_MATH_ONLY__", "1"); 548 else 549 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 550 551 if (LangOpts.GNUInline) 552 Builder.defineMacro("__GNUC_GNU_INLINE__"); 553 else 554 Builder.defineMacro("__GNUC_STDC_INLINE__"); 555 556 // The value written by __atomic_test_and_set. 557 // FIXME: This is target-dependent. 558 Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1"); 559 560 // Used by libstdc++ to implement ATOMIC_<foo>_LOCK_FREE. 561 unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth(); 562 #define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \ 563 Builder.defineMacro("__GCC_ATOMIC_" #TYPE "_LOCK_FREE", \ 564 getLockFreeValue(TI.get##Type##Width(), \ 565 TI.get##Type##Align(), \ 566 InlineWidthBits)); 567 DEFINE_LOCK_FREE_MACRO(BOOL, Bool); 568 DEFINE_LOCK_FREE_MACRO(CHAR, Char); 569 DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16); 570 DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32); 571 DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar); 572 DEFINE_LOCK_FREE_MACRO(SHORT, Short); 573 DEFINE_LOCK_FREE_MACRO(INT, Int); 574 DEFINE_LOCK_FREE_MACRO(LONG, Long); 575 DEFINE_LOCK_FREE_MACRO(LLONG, LongLong); 576 Builder.defineMacro("__GCC_ATOMIC_POINTER_LOCK_FREE", 577 getLockFreeValue(TI.getPointerWidth(0), 578 TI.getPointerAlign(0), 579 InlineWidthBits)); 580 #undef DEFINE_LOCK_FREE_MACRO 581 582 if (LangOpts.NoInlineDefine) 583 Builder.defineMacro("__NO_INLINE__"); 584 585 if (unsigned PICLevel = LangOpts.PICLevel) { 586 Builder.defineMacro("__PIC__", Twine(PICLevel)); 587 Builder.defineMacro("__pic__", Twine(PICLevel)); 588 } 589 if (unsigned PIELevel = LangOpts.PIELevel) { 590 Builder.defineMacro("__PIE__", Twine(PIELevel)); 591 Builder.defineMacro("__pie__", Twine(PIELevel)); 592 } 593 594 // Macros to control C99 numerics and <float.h> 595 Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod())); 596 Builder.defineMacro("__FLT_RADIX__", "2"); 597 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 598 Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig)); 599 600 if (LangOpts.getStackProtector() == LangOptions::SSPOn) 601 Builder.defineMacro("__SSP__"); 602 else if (LangOpts.getStackProtector() == LangOptions::SSPReq) 603 Builder.defineMacro("__SSP_ALL__", "2"); 604 605 if (FEOpts.ProgramAction == frontend::RewriteObjC) 606 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 607 608 // Define a macro that exists only when using the static analyzer. 609 if (FEOpts.ProgramAction == frontend::RunAnalysis) 610 Builder.defineMacro("__clang_analyzer__"); 611 612 if (LangOpts.FastRelaxedMath) 613 Builder.defineMacro("__FAST_RELAXED_MATH__"); 614 615 if (LangOpts.ObjCAutoRefCount) { 616 Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))"); 617 Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))"); 618 Builder.defineMacro("__autoreleasing", 619 "__attribute__((objc_ownership(autoreleasing)))"); 620 Builder.defineMacro("__unsafe_unretained", 621 "__attribute__((objc_ownership(none)))"); 622 } 623 624 // Get other target #defines. 625 TI.getTargetDefines(LangOpts, Builder); 626 } 627 628 // Initialize the remapping of files to alternative contents, e.g., 629 // those specified through other files. 630 static void InitializeFileRemapping(DiagnosticsEngine &Diags, 631 SourceManager &SourceMgr, 632 FileManager &FileMgr, 633 const PreprocessorOptions &InitOpts) { 634 // Remap files in the source manager (with buffers). 635 for (PreprocessorOptions::const_remapped_file_buffer_iterator 636 Remap = InitOpts.remapped_file_buffer_begin(), 637 RemapEnd = InitOpts.remapped_file_buffer_end(); 638 Remap != RemapEnd; 639 ++Remap) { 640 // Create the file entry for the file that we're mapping from. 641 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 642 Remap->second->getBufferSize(), 643 0); 644 if (!FromFile) { 645 Diags.Report(diag::err_fe_remap_missing_from_file) 646 << Remap->first; 647 if (!InitOpts.RetainRemappedFileBuffers) 648 delete Remap->second; 649 continue; 650 } 651 652 // Override the contents of the "from" file with the contents of 653 // the "to" file. 654 SourceMgr.overrideFileContents(FromFile, Remap->second, 655 InitOpts.RetainRemappedFileBuffers); 656 } 657 658 // Remap files in the source manager (with other files). 659 for (PreprocessorOptions::const_remapped_file_iterator 660 Remap = InitOpts.remapped_file_begin(), 661 RemapEnd = InitOpts.remapped_file_end(); 662 Remap != RemapEnd; 663 ++Remap) { 664 // Find the file that we're mapping to. 665 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 666 if (!ToFile) { 667 Diags.Report(diag::err_fe_remap_missing_to_file) 668 << Remap->first << Remap->second; 669 continue; 670 } 671 672 // Create the file entry for the file that we're mapping from. 673 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 674 ToFile->getSize(), 0); 675 if (!FromFile) { 676 Diags.Report(diag::err_fe_remap_missing_from_file) 677 << Remap->first; 678 continue; 679 } 680 681 // Override the contents of the "from" file with the contents of 682 // the "to" file. 683 SourceMgr.overrideFileContents(FromFile, ToFile); 684 } 685 686 SourceMgr.setOverridenFilesKeepOriginalName( 687 InitOpts.RemappedFilesKeepOriginalName); 688 } 689 690 /// InitializePreprocessor - Initialize the preprocessor getting it and the 691 /// environment ready to process a single file. This returns true on error. 692 /// 693 void clang::InitializePreprocessor(Preprocessor &PP, 694 const PreprocessorOptions &InitOpts, 695 const HeaderSearchOptions &HSOpts, 696 const FrontendOptions &FEOpts) { 697 const LangOptions &LangOpts = PP.getLangOpts(); 698 std::string PredefineBuffer; 699 PredefineBuffer.reserve(4080); 700 llvm::raw_string_ostream Predefines(PredefineBuffer); 701 MacroBuilder Builder(Predefines); 702 703 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 704 PP.getFileManager(), InitOpts); 705 706 // Emit line markers for various builtin sections of the file. We don't do 707 // this in asm preprocessor mode, because "# 4" is not a line marker directive 708 // in this mode. 709 if (!PP.getLangOpts().AsmPreprocessor) 710 Builder.append("# 1 \"<built-in>\" 3"); 711 712 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 713 if (InitOpts.UsePredefines) { 714 InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder); 715 716 // Install definitions to make Objective-C++ ARC work well with various 717 // C++ Standard Library implementations. 718 if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) { 719 switch (InitOpts.ObjCXXARCStandardLibrary) { 720 case ARCXX_nolib: 721 case ARCXX_libcxx: 722 break; 723 724 case ARCXX_libstdcxx: 725 AddObjCXXARCLibstdcxxDefines(LangOpts, Builder); 726 break; 727 } 728 } 729 } 730 731 // Even with predefines off, some macros are still predefined. 732 // These should all be defined in the preprocessor according to the 733 // current language configuration. 734 InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(), 735 FEOpts, Builder); 736 737 // Add on the predefines from the driver. Wrap in a #line directive to report 738 // that they come from the command line. 739 if (!PP.getLangOpts().AsmPreprocessor) 740 Builder.append("# 1 \"<command line>\" 1"); 741 742 // Process #define's and #undef's in the order they are given. 743 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 744 if (InitOpts.Macros[i].second) // isUndef 745 Builder.undefineMacro(InitOpts.Macros[i].first); 746 else 747 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 748 PP.getDiagnostics()); 749 } 750 751 // If -imacros are specified, include them now. These are processed before 752 // any -include directives. 753 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 754 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i], 755 PP.getFileManager()); 756 757 // Process -include directives. 758 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 759 const std::string &Path = InitOpts.Includes[i]; 760 if (Path == InitOpts.ImplicitPTHInclude) 761 AddImplicitIncludePTH(Builder, PP, Path); 762 else 763 AddImplicitInclude(Builder, Path, PP.getFileManager()); 764 } 765 766 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 767 if (!PP.getLangOpts().AsmPreprocessor) 768 Builder.append("# 1 \"<built-in>\" 2"); 769 770 // Instruct the preprocessor to skip the preamble. 771 PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, 772 InitOpts.PrecompiledPreambleBytes.second); 773 774 // Copy PredefinedBuffer into the Preprocessor. 775 PP.setPredefines(Predefines.str()); 776 777 // Initialize the header search object. 778 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 779 PP.getLangOpts(), 780 PP.getTargetInfo().getTriple()); 781 } 782