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.ObjCRuntimeHasWeak) { 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 if (LangOpts.CPlusPlus0x) { 434 Builder.defineMacro("_HAS_CHAR16_T_LANGUAGE_SUPPORT", "1"); 435 } 436 } 437 438 if (LangOpts.Optimize) 439 Builder.defineMacro("__OPTIMIZE__"); 440 if (LangOpts.OptimizeSize) 441 Builder.defineMacro("__OPTIMIZE_SIZE__"); 442 443 if (LangOpts.FastMath) 444 Builder.defineMacro("__FAST_MATH__"); 445 446 // Initialize target-specific preprocessor defines. 447 448 // Define type sizing macros based on the target properties. 449 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 450 Builder.defineMacro("__CHAR_BIT__", "8"); 451 452 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 453 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 454 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 455 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 456 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 457 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 458 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 459 460 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 461 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 462 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 463 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 464 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 465 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 466 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 467 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 468 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 469 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 470 DefineTypeSizeof("__SIZEOF_SIZE_T__", 471 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 472 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 473 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 474 DefineTypeSizeof("__SIZEOF_WINT_T__", 475 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 476 477 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 478 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 479 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 480 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 481 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 482 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 483 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 484 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 485 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 486 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 487 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 488 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 489 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 490 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 491 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 492 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 493 494 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); 495 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); 496 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); 497 498 // Define a __POINTER_WIDTH__ macro for stdint.h. 499 Builder.defineMacro("__POINTER_WIDTH__", 500 Twine((int)TI.getPointerWidth(0))); 501 502 if (!LangOpts.CharIsSigned) 503 Builder.defineMacro("__CHAR_UNSIGNED__"); 504 505 if (!TargetInfo::isTypeSigned(TI.getWCharType())) 506 Builder.defineMacro("__WCHAR_UNSIGNED__"); 507 508 if (!TargetInfo::isTypeSigned(TI.getWIntType())) 509 Builder.defineMacro("__WINT_UNSIGNED__"); 510 511 // Define exact-width integer types for stdint.h 512 Builder.defineMacro("__INT" + Twine(TI.getCharWidth()) + "_TYPE__", 513 "char"); 514 515 if (TI.getShortWidth() > TI.getCharWidth()) 516 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 517 518 if (TI.getIntWidth() > TI.getShortWidth()) 519 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 520 521 if (TI.getLongWidth() > TI.getIntWidth()) 522 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 523 524 if (TI.getLongLongWidth() > TI.getLongWidth()) 525 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 526 527 if (const char *Prefix = TI.getUserLabelPrefix()) 528 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 529 530 if (LangOpts.FastMath || LangOpts.FiniteMathOnly) 531 Builder.defineMacro("__FINITE_MATH_ONLY__", "1"); 532 else 533 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 534 535 if (LangOpts.GNUInline) 536 Builder.defineMacro("__GNUC_GNU_INLINE__"); 537 else 538 Builder.defineMacro("__GNUC_STDC_INLINE__"); 539 540 // The value written by __atomic_test_and_set. 541 // FIXME: This is target-dependent. 542 Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1"); 543 544 // Used by libstdc++ to implement ATOMIC_<foo>_LOCK_FREE. 545 unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth(); 546 #define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \ 547 Builder.defineMacro("__GCC_ATOMIC_" #TYPE "_LOCK_FREE", \ 548 getLockFreeValue(TI.get##Type##Width(), \ 549 TI.get##Type##Align(), \ 550 InlineWidthBits)); 551 DEFINE_LOCK_FREE_MACRO(BOOL, Bool); 552 DEFINE_LOCK_FREE_MACRO(CHAR, Char); 553 DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16); 554 DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32); 555 DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar); 556 DEFINE_LOCK_FREE_MACRO(SHORT, Short); 557 DEFINE_LOCK_FREE_MACRO(INT, Int); 558 DEFINE_LOCK_FREE_MACRO(LONG, Long); 559 DEFINE_LOCK_FREE_MACRO(LLONG, LongLong); 560 Builder.defineMacro("__GCC_ATOMIC_POINTER_LOCK_FREE", 561 getLockFreeValue(TI.getPointerWidth(0), 562 TI.getPointerAlign(0), 563 InlineWidthBits)); 564 #undef DEFINE_LOCK_FREE_MACRO 565 566 if (LangOpts.NoInlineDefine) 567 Builder.defineMacro("__NO_INLINE__"); 568 569 if (unsigned PICLevel = LangOpts.PICLevel) { 570 Builder.defineMacro("__PIC__", Twine(PICLevel)); 571 Builder.defineMacro("__pic__", Twine(PICLevel)); 572 } 573 if (unsigned PIELevel = LangOpts.PIELevel) { 574 Builder.defineMacro("__PIE__", Twine(PIELevel)); 575 Builder.defineMacro("__pie__", Twine(PIELevel)); 576 } 577 578 // Macros to control C99 numerics and <float.h> 579 Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod())); 580 Builder.defineMacro("__FLT_RADIX__", "2"); 581 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 582 Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig)); 583 584 if (LangOpts.getStackProtector() == LangOptions::SSPOn) 585 Builder.defineMacro("__SSP__"); 586 else if (LangOpts.getStackProtector() == LangOptions::SSPReq) 587 Builder.defineMacro("__SSP_ALL__", "2"); 588 589 if (FEOpts.ProgramAction == frontend::RewriteObjC) 590 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 591 592 // Define a macro that exists only when using the static analyzer. 593 if (FEOpts.ProgramAction == frontend::RunAnalysis) 594 Builder.defineMacro("__clang_analyzer__"); 595 596 if (LangOpts.FastRelaxedMath) 597 Builder.defineMacro("__FAST_RELAXED_MATH__"); 598 599 if (LangOpts.ObjCAutoRefCount) { 600 Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))"); 601 Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))"); 602 Builder.defineMacro("__autoreleasing", 603 "__attribute__((objc_ownership(autoreleasing)))"); 604 Builder.defineMacro("__unsafe_unretained", 605 "__attribute__((objc_ownership(none)))"); 606 } 607 608 // Get other target #defines. 609 TI.getTargetDefines(LangOpts, Builder); 610 } 611 612 // Initialize the remapping of files to alternative contents, e.g., 613 // those specified through other files. 614 static void InitializeFileRemapping(DiagnosticsEngine &Diags, 615 SourceManager &SourceMgr, 616 FileManager &FileMgr, 617 const PreprocessorOptions &InitOpts) { 618 // Remap files in the source manager (with buffers). 619 for (PreprocessorOptions::const_remapped_file_buffer_iterator 620 Remap = InitOpts.remapped_file_buffer_begin(), 621 RemapEnd = InitOpts.remapped_file_buffer_end(); 622 Remap != RemapEnd; 623 ++Remap) { 624 // Create the file entry for the file that we're mapping from. 625 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 626 Remap->second->getBufferSize(), 627 0); 628 if (!FromFile) { 629 Diags.Report(diag::err_fe_remap_missing_from_file) 630 << Remap->first; 631 if (!InitOpts.RetainRemappedFileBuffers) 632 delete Remap->second; 633 continue; 634 } 635 636 // Override the contents of the "from" file with the contents of 637 // the "to" file. 638 SourceMgr.overrideFileContents(FromFile, Remap->second, 639 InitOpts.RetainRemappedFileBuffers); 640 } 641 642 // Remap files in the source manager (with other files). 643 for (PreprocessorOptions::const_remapped_file_iterator 644 Remap = InitOpts.remapped_file_begin(), 645 RemapEnd = InitOpts.remapped_file_end(); 646 Remap != RemapEnd; 647 ++Remap) { 648 // Find the file that we're mapping to. 649 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 650 if (!ToFile) { 651 Diags.Report(diag::err_fe_remap_missing_to_file) 652 << Remap->first << Remap->second; 653 continue; 654 } 655 656 // Create the file entry for the file that we're mapping from. 657 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 658 ToFile->getSize(), 0); 659 if (!FromFile) { 660 Diags.Report(diag::err_fe_remap_missing_from_file) 661 << Remap->first; 662 continue; 663 } 664 665 // Override the contents of the "from" file with the contents of 666 // the "to" file. 667 SourceMgr.overrideFileContents(FromFile, ToFile); 668 } 669 670 SourceMgr.setOverridenFilesKeepOriginalName( 671 InitOpts.RemappedFilesKeepOriginalName); 672 } 673 674 /// InitializePreprocessor - Initialize the preprocessor getting it and the 675 /// environment ready to process a single file. This returns true on error. 676 /// 677 void clang::InitializePreprocessor(Preprocessor &PP, 678 const PreprocessorOptions &InitOpts, 679 const HeaderSearchOptions &HSOpts, 680 const FrontendOptions &FEOpts) { 681 const LangOptions &LangOpts = PP.getLangOpts(); 682 std::string PredefineBuffer; 683 PredefineBuffer.reserve(4080); 684 llvm::raw_string_ostream Predefines(PredefineBuffer); 685 MacroBuilder Builder(Predefines); 686 687 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 688 PP.getFileManager(), InitOpts); 689 690 // Emit line markers for various builtin sections of the file. We don't do 691 // this in asm preprocessor mode, because "# 4" is not a line marker directive 692 // in this mode. 693 if (!PP.getLangOpts().AsmPreprocessor) 694 Builder.append("# 1 \"<built-in>\" 3"); 695 696 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 697 if (InitOpts.UsePredefines) { 698 InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder); 699 700 // Install definitions to make Objective-C++ ARC work well with various 701 // C++ Standard Library implementations. 702 if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) { 703 switch (InitOpts.ObjCXXARCStandardLibrary) { 704 case ARCXX_nolib: 705 case ARCXX_libcxx: 706 break; 707 708 case ARCXX_libstdcxx: 709 AddObjCXXARCLibstdcxxDefines(LangOpts, Builder); 710 break; 711 } 712 } 713 } 714 715 // Even with predefines off, some macros are still predefined. 716 // These should all be defined in the preprocessor according to the 717 // current language configuration. 718 InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(), 719 FEOpts, Builder); 720 721 // Add on the predefines from the driver. Wrap in a #line directive to report 722 // that they come from the command line. 723 if (!PP.getLangOpts().AsmPreprocessor) 724 Builder.append("# 1 \"<command line>\" 1"); 725 726 // Process #define's and #undef's in the order they are given. 727 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 728 if (InitOpts.Macros[i].second) // isUndef 729 Builder.undefineMacro(InitOpts.Macros[i].first); 730 else 731 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 732 PP.getDiagnostics()); 733 } 734 735 // If -imacros are specified, include them now. These are processed before 736 // any -include directives. 737 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 738 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i], 739 PP.getFileManager()); 740 741 // Process -include directives. 742 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 743 const std::string &Path = InitOpts.Includes[i]; 744 if (Path == InitOpts.ImplicitPTHInclude) 745 AddImplicitIncludePTH(Builder, PP, Path); 746 else 747 AddImplicitInclude(Builder, Path, PP.getFileManager()); 748 } 749 750 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 751 if (!PP.getLangOpts().AsmPreprocessor) 752 Builder.append("# 1 \"<built-in>\" 2"); 753 754 // Instruct the preprocessor to skip the preamble. 755 PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, 756 InitOpts.PrecompiledPreambleBytes.second); 757 758 // Copy PredefinedBuffer into the Preprocessor. 759 PP.setPredefines(Predefines.str()); 760 761 // Initialize the header search object. 762 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 763 PP.getLangOpts(), 764 PP.getTargetInfo().getTriple()); 765 } 766