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/Frontend/Utils.h" 15 #include "clang/Basic/FileManager.h" 16 #include "clang/Basic/MacroBuilder.h" 17 #include "clang/Basic/SourceManager.h" 18 #include "clang/Basic/TargetInfo.h" 19 #include "clang/Basic/Version.h" 20 #include "clang/Frontend/FrontendDiagnostic.h" 21 #include "clang/Frontend/FrontendOptions.h" 22 #include "clang/Lex/HeaderSearch.h" 23 #include "clang/Lex/Preprocessor.h" 24 #include "clang/Lex/PreprocessorOptions.h" 25 #include "clang/Serialization/ASTReader.h" 26 #include "llvm/ADT/APFloat.h" 27 #include "llvm/Support/FileSystem.h" 28 #include "llvm/Support/MemoryBuffer.h" 29 #include "llvm/Support/Path.h" 30 using namespace clang; 31 32 // Append a #define line to Buf for Macro. Macro should be of the form XXX, 33 // in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit 34 // "#define XXX Y z W". To get a #define with no value, use "XXX=". 35 static void DefineBuiltinMacro(MacroBuilder &Builder, StringRef Macro, 36 DiagnosticsEngine &Diags) { 37 std::pair<StringRef, StringRef> MacroPair = Macro.split('='); 38 StringRef MacroName = MacroPair.first; 39 StringRef MacroBody = MacroPair.second; 40 if (MacroName.size() != Macro.size()) { 41 // Per GCC -D semantics, the macro ends at \n if it exists. 42 StringRef::size_type End = MacroBody.find_first_of("\n\r"); 43 if (End != StringRef::npos) 44 Diags.Report(diag::warn_fe_macro_contains_embedded_newline) 45 << MacroName; 46 Builder.defineMacro(MacroName, MacroBody.substr(0, End)); 47 } else { 48 // Push "macroname 1". 49 Builder.defineMacro(Macro); 50 } 51 } 52 53 /// AddImplicitInclude - Add an implicit \#include of the specified file to the 54 /// predefines buffer. 55 static void AddImplicitInclude(MacroBuilder &Builder, StringRef File, 56 FileManager &FileMgr) { 57 Builder.append(Twine("#include \"") + 58 HeaderSearch::NormalizeDashIncludePath(File, FileMgr) + "\""); 59 } 60 61 static void AddImplicitIncludeMacros(MacroBuilder &Builder, 62 StringRef File, 63 FileManager &FileMgr) { 64 Builder.append(Twine("#__include_macros \"") + 65 HeaderSearch::NormalizeDashIncludePath(File, FileMgr) + "\""); 66 // Marker token to stop the __include_macros fetch loop. 67 Builder.append("##"); // ##? 68 } 69 70 /// AddImplicitIncludePTH - Add an implicit \#include using the original file 71 /// used to generate a PTH cache. 72 static void AddImplicitIncludePTH(MacroBuilder &Builder, Preprocessor &PP, 73 StringRef ImplicitIncludePTH) { 74 PTHManager *P = PP.getPTHManager(); 75 // Null check 'P' in the corner case where it couldn't be created. 76 const char *OriginalFile = P ? P->getOriginalSourceFile() : 0; 77 78 if (!OriginalFile) { 79 PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header) 80 << ImplicitIncludePTH; 81 return; 82 } 83 84 AddImplicitInclude(Builder, OriginalFile, PP.getFileManager()); 85 } 86 87 /// \brief Add an implicit \#include using the original file used to generate 88 /// a PCH file. 89 static void AddImplicitIncludePCH(MacroBuilder &Builder, Preprocessor &PP, 90 StringRef ImplicitIncludePCH) { 91 std::string OriginalFile = 92 ASTReader::getOriginalSourceFile(ImplicitIncludePCH, PP.getFileManager(), 93 PP.getDiagnostics()); 94 if (OriginalFile.empty()) 95 return; 96 97 AddImplicitInclude(Builder, OriginalFile, PP.getFileManager()); 98 } 99 100 /// PickFP - This is used to pick a value based on the FP semantics of the 101 /// specified FP model. 102 template <typename T> 103 static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, 104 T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal, 105 T IEEEQuadVal) { 106 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle) 107 return IEEESingleVal; 108 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble) 109 return IEEEDoubleVal; 110 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended) 111 return X87DoubleExtendedVal; 112 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble) 113 return PPCDoubleDoubleVal; 114 assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad); 115 return IEEEQuadVal; 116 } 117 118 static void DefineFloatMacros(MacroBuilder &Builder, StringRef Prefix, 119 const llvm::fltSemantics *Sem, StringRef Ext) { 120 const char *DenormMin, *Epsilon, *Max, *Min; 121 DenormMin = PickFP(Sem, "1.40129846e-45", "4.9406564584124654e-324", 122 "3.64519953188247460253e-4951", 123 "4.94065645841246544176568792868221e-324", 124 "6.47517511943802511092443895822764655e-4966"); 125 int Digits = PickFP(Sem, 6, 15, 18, 31, 33); 126 Epsilon = PickFP(Sem, "1.19209290e-7", "2.2204460492503131e-16", 127 "1.08420217248550443401e-19", 128 "4.94065645841246544176568792868221e-324", 129 "1.92592994438723585305597794258492732e-34"); 130 int MantissaDigits = PickFP(Sem, 24, 53, 64, 106, 113); 131 int Min10Exp = PickFP(Sem, -37, -307, -4931, -291, -4931); 132 int Max10Exp = PickFP(Sem, 38, 308, 4932, 308, 4932); 133 int MinExp = PickFP(Sem, -125, -1021, -16381, -968, -16381); 134 int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024, 16384); 135 Min = PickFP(Sem, "1.17549435e-38", "2.2250738585072014e-308", 136 "3.36210314311209350626e-4932", 137 "2.00416836000897277799610805135016e-292", 138 "3.36210314311209350626267781732175260e-4932"); 139 Max = PickFP(Sem, "3.40282347e+38", "1.7976931348623157e+308", 140 "1.18973149535723176502e+4932", 141 "1.79769313486231580793728971405301e+308", 142 "1.18973149535723176508575932662800702e+4932"); 143 144 SmallString<32> DefPrefix; 145 DefPrefix = "__"; 146 DefPrefix += Prefix; 147 DefPrefix += "_"; 148 149 Builder.defineMacro(DefPrefix + "DENORM_MIN__", Twine(DenormMin)+Ext); 150 Builder.defineMacro(DefPrefix + "HAS_DENORM__"); 151 Builder.defineMacro(DefPrefix + "DIG__", Twine(Digits)); 152 Builder.defineMacro(DefPrefix + "EPSILON__", Twine(Epsilon)+Ext); 153 Builder.defineMacro(DefPrefix + "HAS_INFINITY__"); 154 Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__"); 155 Builder.defineMacro(DefPrefix + "MANT_DIG__", Twine(MantissaDigits)); 156 157 Builder.defineMacro(DefPrefix + "MAX_10_EXP__", Twine(Max10Exp)); 158 Builder.defineMacro(DefPrefix + "MAX_EXP__", Twine(MaxExp)); 159 Builder.defineMacro(DefPrefix + "MAX__", Twine(Max)+Ext); 160 161 Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+Twine(Min10Exp)+")"); 162 Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+Twine(MinExp)+")"); 163 Builder.defineMacro(DefPrefix + "MIN__", Twine(Min)+Ext); 164 } 165 166 167 /// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro 168 /// named MacroName with the max value for a type with width 'TypeWidth' a 169 /// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL). 170 static void DefineTypeSize(StringRef MacroName, unsigned TypeWidth, 171 StringRef ValSuffix, bool isSigned, 172 MacroBuilder &Builder) { 173 llvm::APInt MaxVal = isSigned ? llvm::APInt::getSignedMaxValue(TypeWidth) 174 : llvm::APInt::getMaxValue(TypeWidth); 175 Builder.defineMacro(MacroName, MaxVal.toString(10, isSigned) + ValSuffix); 176 } 177 178 /// DefineTypeSize - An overloaded helper that uses TargetInfo to determine 179 /// the width, suffix, and signedness of the given type 180 static void DefineTypeSize(StringRef MacroName, TargetInfo::IntType Ty, 181 const TargetInfo &TI, MacroBuilder &Builder) { 182 DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty), 183 TI.isTypeSigned(Ty), Builder); 184 } 185 186 static void DefineType(const Twine &MacroName, TargetInfo::IntType Ty, 187 MacroBuilder &Builder) { 188 Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty)); 189 } 190 191 static void DefineTypeWidth(StringRef MacroName, TargetInfo::IntType Ty, 192 const TargetInfo &TI, MacroBuilder &Builder) { 193 Builder.defineMacro(MacroName, Twine(TI.getTypeWidth(Ty))); 194 } 195 196 static void DefineTypeSizeof(StringRef MacroName, unsigned BitWidth, 197 const TargetInfo &TI, MacroBuilder &Builder) { 198 Builder.defineMacro(MacroName, 199 Twine(BitWidth / TI.getCharWidth())); 200 } 201 202 static void DefineExactWidthIntType(TargetInfo::IntType Ty, 203 const TargetInfo &TI, MacroBuilder &Builder) { 204 int TypeWidth = TI.getTypeWidth(Ty); 205 206 // Use the target specified int64 type, when appropriate, so that [u]int64_t 207 // ends up being defined in terms of the correct type. 208 if (TypeWidth == 64) 209 Ty = TI.getInt64Type(); 210 211 DefineType("__INT" + Twine(TypeWidth) + "_TYPE__", Ty, Builder); 212 213 StringRef ConstSuffix(TargetInfo::getTypeConstantSuffix(Ty)); 214 if (!ConstSuffix.empty()) 215 Builder.defineMacro("__INT" + Twine(TypeWidth) + "_C_SUFFIX__", 216 ConstSuffix); 217 } 218 219 /// Get the value the ATOMIC_*_LOCK_FREE macro should have for a type with 220 /// the specified properties. 221 static const char *getLockFreeValue(unsigned TypeWidth, unsigned TypeAlign, 222 unsigned InlineWidth) { 223 // Fully-aligned, power-of-2 sizes no larger than the inline 224 // width will be inlined as lock-free operations. 225 if (TypeWidth == TypeAlign && (TypeWidth & (TypeWidth - 1)) == 0 && 226 TypeWidth <= InlineWidth) 227 return "2"; // "always lock free" 228 // We cannot be certain what operations the lib calls might be 229 // able to implement as lock-free on future processors. 230 return "1"; // "sometimes lock free" 231 } 232 233 /// \brief Add definitions required for a smooth interaction between 234 /// Objective-C++ automated reference counting and libstdc++ (4.2). 235 static void AddObjCXXARCLibstdcxxDefines(const LangOptions &LangOpts, 236 MacroBuilder &Builder) { 237 Builder.defineMacro("_GLIBCXX_PREDEFINED_OBJC_ARC_IS_SCALAR"); 238 239 std::string Result; 240 { 241 // Provide specializations for the __is_scalar type trait so that 242 // lifetime-qualified objects are not considered "scalar" types, which 243 // libstdc++ uses as an indicator of the presence of trivial copy, assign, 244 // default-construct, and destruct semantics (none of which hold for 245 // lifetime-qualified objects in ARC). 246 llvm::raw_string_ostream Out(Result); 247 248 Out << "namespace std {\n" 249 << "\n" 250 << "struct __true_type;\n" 251 << "struct __false_type;\n" 252 << "\n"; 253 254 Out << "template<typename _Tp> struct __is_scalar;\n" 255 << "\n"; 256 257 Out << "template<typename _Tp>\n" 258 << "struct __is_scalar<__attribute__((objc_ownership(strong))) _Tp> {\n" 259 << " enum { __value = 0 };\n" 260 << " typedef __false_type __type;\n" 261 << "};\n" 262 << "\n"; 263 264 if (LangOpts.ObjCARCWeak) { 265 Out << "template<typename _Tp>\n" 266 << "struct __is_scalar<__attribute__((objc_ownership(weak))) _Tp> {\n" 267 << " enum { __value = 0 };\n" 268 << " typedef __false_type __type;\n" 269 << "};\n" 270 << "\n"; 271 } 272 273 Out << "template<typename _Tp>\n" 274 << "struct __is_scalar<__attribute__((objc_ownership(autoreleasing)))" 275 << " _Tp> {\n" 276 << " enum { __value = 0 };\n" 277 << " typedef __false_type __type;\n" 278 << "};\n" 279 << "\n"; 280 281 Out << "}\n"; 282 } 283 Builder.append(Result); 284 } 285 286 static void InitializeStandardPredefinedMacros(const TargetInfo &TI, 287 const LangOptions &LangOpts, 288 const FrontendOptions &FEOpts, 289 MacroBuilder &Builder) { 290 if (!LangOpts.MicrosoftMode && !LangOpts.TraditionalCPP) 291 Builder.defineMacro("__STDC__"); 292 if (LangOpts.Freestanding) 293 Builder.defineMacro("__STDC_HOSTED__", "0"); 294 else 295 Builder.defineMacro("__STDC_HOSTED__"); 296 297 if (!LangOpts.CPlusPlus) { 298 if (LangOpts.C11) 299 Builder.defineMacro("__STDC_VERSION__", "201112L"); 300 else if (LangOpts.C99) 301 Builder.defineMacro("__STDC_VERSION__", "199901L"); 302 else if (!LangOpts.GNUMode && LangOpts.Digraphs) 303 Builder.defineMacro("__STDC_VERSION__", "199409L"); 304 } else { 305 // FIXME: Use the right value for __cplusplus for C++1y once one is chosen. 306 if (LangOpts.CPlusPlus1y) 307 Builder.defineMacro("__cplusplus", "201305L"); 308 // C++11 [cpp.predefined]p1: 309 // The name __cplusplus is defined to the value 201103L when compiling a 310 // C++ translation unit. 311 else if (LangOpts.CPlusPlus11) 312 Builder.defineMacro("__cplusplus", "201103L"); 313 // C++03 [cpp.predefined]p1: 314 // The name __cplusplus is defined to the value 199711L when compiling a 315 // C++ translation unit. 316 else 317 Builder.defineMacro("__cplusplus", "199711L"); 318 } 319 320 if (LangOpts.ObjC1) 321 Builder.defineMacro("__OBJC__"); 322 323 // Not "standard" per se, but available even with the -undef flag. 324 if (LangOpts.AsmPreprocessor) 325 Builder.defineMacro("__ASSEMBLER__"); 326 } 327 328 static void InitializePredefinedMacros(const TargetInfo &TI, 329 const LangOptions &LangOpts, 330 const FrontendOptions &FEOpts, 331 MacroBuilder &Builder) { 332 // Compiler version introspection macros. 333 Builder.defineMacro("__llvm__"); // LLVM Backend 334 Builder.defineMacro("__clang__"); // Clang Frontend 335 #define TOSTR2(X) #X 336 #define TOSTR(X) TOSTR2(X) 337 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 338 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 339 #ifdef CLANG_VERSION_PATCHLEVEL 340 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 341 #else 342 Builder.defineMacro("__clang_patchlevel__", "0"); 343 #endif 344 Builder.defineMacro("__clang_version__", 345 "\"" CLANG_VERSION_STRING " " 346 + getClangFullRepositoryVersion() + "\""); 347 #undef TOSTR 348 #undef TOSTR2 349 if (!LangOpts.MicrosoftMode) { 350 // Currently claim to be compatible with GCC 4.2.1-5621, but only if we're 351 // not compiling for MSVC compatibility 352 Builder.defineMacro("__GNUC_MINOR__", "2"); 353 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 354 Builder.defineMacro("__GNUC__", "4"); 355 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 356 } 357 358 // Define macros for the C11 / C++11 memory orderings 359 Builder.defineMacro("__ATOMIC_RELAXED", "0"); 360 Builder.defineMacro("__ATOMIC_CONSUME", "1"); 361 Builder.defineMacro("__ATOMIC_ACQUIRE", "2"); 362 Builder.defineMacro("__ATOMIC_RELEASE", "3"); 363 Builder.defineMacro("__ATOMIC_ACQ_REL", "4"); 364 Builder.defineMacro("__ATOMIC_SEQ_CST", "5"); 365 366 // Support for #pragma redefine_extname (Sun compatibility) 367 Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1"); 368 369 // As sad as it is, enough software depends on the __VERSION__ for version 370 // checks that it is necessary to report 4.2.1 (the base GCC version we claim 371 // compatibility with) first. 372 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " + 373 Twine(getClangFullCPPVersion()) + "\""); 374 375 // Initialize language-specific preprocessor defines. 376 377 // Standard conforming mode? 378 if (!LangOpts.GNUMode) 379 Builder.defineMacro("__STRICT_ANSI__"); 380 381 if (LangOpts.CPlusPlus11) 382 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 383 384 if (LangOpts.ObjC1) { 385 if (LangOpts.ObjCRuntime.isNonFragile()) { 386 Builder.defineMacro("__OBJC2__"); 387 388 if (LangOpts.ObjCExceptions) 389 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 390 } 391 392 if (LangOpts.getGC() != LangOptions::NonGC) 393 Builder.defineMacro("__OBJC_GC__"); 394 395 if (LangOpts.ObjCRuntime.isNeXTFamily()) 396 Builder.defineMacro("__NEXT_RUNTIME__"); 397 398 Builder.defineMacro("IBOutlet", "__attribute__((iboutlet))"); 399 Builder.defineMacro("IBOutletCollection(ClassName)", 400 "__attribute__((iboutletcollection(ClassName)))"); 401 Builder.defineMacro("IBAction", "void)__attribute__((ibaction)"); 402 } 403 404 // darwin_constant_cfstrings controls this. This is also dependent 405 // on other things like the runtime I believe. This is set even for C code. 406 if (!LangOpts.NoConstantCFStrings) 407 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 408 409 if (LangOpts.ObjC2) 410 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 411 412 if (LangOpts.PascalStrings) 413 Builder.defineMacro("__PASCAL_STRINGS__"); 414 415 if (LangOpts.Blocks) { 416 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 417 Builder.defineMacro("__BLOCKS__"); 418 } 419 420 if (LangOpts.CXXExceptions) 421 Builder.defineMacro("__EXCEPTIONS"); 422 if (LangOpts.RTTI) 423 Builder.defineMacro("__GXX_RTTI"); 424 if (LangOpts.SjLjExceptions) 425 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 426 427 if (LangOpts.Deprecated) 428 Builder.defineMacro("__DEPRECATED"); 429 430 if (LangOpts.CPlusPlus) { 431 Builder.defineMacro("__GNUG__", "4"); 432 Builder.defineMacro("__GXX_WEAK__"); 433 Builder.defineMacro("__private_extern__", "extern"); 434 } 435 436 if (LangOpts.MicrosoftExt) { 437 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 438 // VC++ appears to only like __FUNCTION__. 439 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 440 // Work around some issues with Visual C++ headers. 441 if (LangOpts.WChar) { 442 // wchar_t supported as a keyword. 443 Builder.defineMacro("_WCHAR_T_DEFINED"); 444 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 445 } 446 if (LangOpts.CPlusPlus) { 447 // FIXME: Support Microsoft's __identifier extension in the lexer. 448 Builder.append("#define __identifier(x) x"); 449 Builder.append("class type_info;"); 450 } 451 } 452 453 if (LangOpts.Optimize) 454 Builder.defineMacro("__OPTIMIZE__"); 455 if (LangOpts.OptimizeSize) 456 Builder.defineMacro("__OPTIMIZE_SIZE__"); 457 458 if (LangOpts.FastMath) 459 Builder.defineMacro("__FAST_MATH__"); 460 461 // Initialize target-specific preprocessor defines. 462 463 // __BYTE_ORDER__ was added in GCC 4.6. It's analogous 464 // to the macro __BYTE_ORDER (no trailing underscores) 465 // from glibc's <endian.h> header. 466 // We don't support the PDP-11 as a target, but include 467 // the define so it can still be compared against. 468 Builder.defineMacro("__ORDER_LITTLE_ENDIAN__", "1234"); 469 Builder.defineMacro("__ORDER_BIG_ENDIAN__", "4321"); 470 Builder.defineMacro("__ORDER_PDP_ENDIAN__", "3412"); 471 if (TI.isBigEndian()) 472 Builder.defineMacro("__BYTE_ORDER__", "__ORDER_BIG_ENDIAN__"); 473 else 474 Builder.defineMacro("__BYTE_ORDER__", "__ORDER_LITTLE_ENDIAN__"); 475 476 477 if (TI.getPointerWidth(0) == 64 && TI.getLongWidth() == 64 478 && TI.getIntWidth() == 32) { 479 Builder.defineMacro("_LP64"); 480 Builder.defineMacro("__LP64__"); 481 } 482 483 // Define type sizing macros based on the target properties. 484 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 485 Builder.defineMacro("__CHAR_BIT__", "8"); 486 487 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 488 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 489 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 490 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 491 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 492 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 493 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 494 DefineTypeSize("__SIZE_MAX__", TI.getSizeType(), TI, Builder); 495 496 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 497 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 498 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 499 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 500 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 501 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 502 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 503 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 504 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 505 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 506 DefineTypeSizeof("__SIZEOF_SIZE_T__", 507 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 508 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 509 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 510 DefineTypeSizeof("__SIZEOF_WINT_T__", 511 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 512 if (TI.hasInt128Type()) 513 DefineTypeSizeof("__SIZEOF_INT128__", 128, TI, Builder); 514 515 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 516 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 517 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 518 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 519 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 520 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 521 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 522 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 523 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 524 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 525 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 526 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 527 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 528 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 529 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 530 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 531 532 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat(), "F"); 533 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat(), ""); 534 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat(), "L"); 535 536 // Define a __POINTER_WIDTH__ macro for stdint.h. 537 Builder.defineMacro("__POINTER_WIDTH__", 538 Twine((int)TI.getPointerWidth(0))); 539 540 if (!LangOpts.CharIsSigned) 541 Builder.defineMacro("__CHAR_UNSIGNED__"); 542 543 if (!TargetInfo::isTypeSigned(TI.getWCharType())) 544 Builder.defineMacro("__WCHAR_UNSIGNED__"); 545 546 if (!TargetInfo::isTypeSigned(TI.getWIntType())) 547 Builder.defineMacro("__WINT_UNSIGNED__"); 548 549 // Define exact-width integer types for stdint.h 550 Builder.defineMacro("__INT" + Twine(TI.getCharWidth()) + "_TYPE__", 551 "char"); 552 553 if (TI.getShortWidth() > TI.getCharWidth()) 554 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 555 556 if (TI.getIntWidth() > TI.getShortWidth()) 557 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 558 559 if (TI.getLongWidth() > TI.getIntWidth()) 560 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 561 562 if (TI.getLongLongWidth() > TI.getLongWidth()) 563 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 564 565 if (const char *Prefix = TI.getUserLabelPrefix()) 566 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 567 568 if (LangOpts.FastMath || LangOpts.FiniteMathOnly) 569 Builder.defineMacro("__FINITE_MATH_ONLY__", "1"); 570 else 571 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 572 573 if (LangOpts.GNUInline) 574 Builder.defineMacro("__GNUC_GNU_INLINE__"); 575 else 576 Builder.defineMacro("__GNUC_STDC_INLINE__"); 577 578 // The value written by __atomic_test_and_set. 579 // FIXME: This is target-dependent. 580 Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1"); 581 582 // Used by libstdc++ to implement ATOMIC_<foo>_LOCK_FREE. 583 unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth(); 584 #define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \ 585 Builder.defineMacro("__GCC_ATOMIC_" #TYPE "_LOCK_FREE", \ 586 getLockFreeValue(TI.get##Type##Width(), \ 587 TI.get##Type##Align(), \ 588 InlineWidthBits)); 589 DEFINE_LOCK_FREE_MACRO(BOOL, Bool); 590 DEFINE_LOCK_FREE_MACRO(CHAR, Char); 591 DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16); 592 DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32); 593 DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar); 594 DEFINE_LOCK_FREE_MACRO(SHORT, Short); 595 DEFINE_LOCK_FREE_MACRO(INT, Int); 596 DEFINE_LOCK_FREE_MACRO(LONG, Long); 597 DEFINE_LOCK_FREE_MACRO(LLONG, LongLong); 598 Builder.defineMacro("__GCC_ATOMIC_POINTER_LOCK_FREE", 599 getLockFreeValue(TI.getPointerWidth(0), 600 TI.getPointerAlign(0), 601 InlineWidthBits)); 602 #undef DEFINE_LOCK_FREE_MACRO 603 604 if (LangOpts.NoInlineDefine) 605 Builder.defineMacro("__NO_INLINE__"); 606 607 if (unsigned PICLevel = LangOpts.PICLevel) { 608 Builder.defineMacro("__PIC__", Twine(PICLevel)); 609 Builder.defineMacro("__pic__", Twine(PICLevel)); 610 } 611 if (unsigned PIELevel = LangOpts.PIELevel) { 612 Builder.defineMacro("__PIE__", Twine(PIELevel)); 613 Builder.defineMacro("__pie__", Twine(PIELevel)); 614 } 615 616 // Macros to control C99 numerics and <float.h> 617 Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod())); 618 Builder.defineMacro("__FLT_RADIX__", "2"); 619 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 620 Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig)); 621 622 if (LangOpts.getStackProtector() == LangOptions::SSPOn) 623 Builder.defineMacro("__SSP__"); 624 else if (LangOpts.getStackProtector() == LangOptions::SSPReq) 625 Builder.defineMacro("__SSP_ALL__", "2"); 626 627 if (FEOpts.ProgramAction == frontend::RewriteObjC) 628 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 629 630 // Define a macro that exists only when using the static analyzer. 631 if (FEOpts.ProgramAction == frontend::RunAnalysis) 632 Builder.defineMacro("__clang_analyzer__"); 633 634 if (LangOpts.FastRelaxedMath) 635 Builder.defineMacro("__FAST_RELAXED_MATH__"); 636 637 if (LangOpts.ObjCAutoRefCount) { 638 Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))"); 639 Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))"); 640 Builder.defineMacro("__autoreleasing", 641 "__attribute__((objc_ownership(autoreleasing)))"); 642 Builder.defineMacro("__unsafe_unretained", 643 "__attribute__((objc_ownership(none)))"); 644 } 645 646 // OpenMP definition 647 if (LangOpts.OpenMP) { 648 // OpenMP 2.2: 649 // In implementations that support a preprocessor, the _OPENMP 650 // macro name is defined to have the decimal value yyyymm where 651 // yyyy and mm are the year and the month designations of the 652 // version of the OpenMP API that the implementation support. 653 Builder.defineMacro("_OPENMP", "201107"); 654 } 655 656 // Get other target #defines. 657 TI.getTargetDefines(LangOpts, Builder); 658 } 659 660 // Initialize the remapping of files to alternative contents, e.g., 661 // those specified through other files. 662 static void InitializeFileRemapping(DiagnosticsEngine &Diags, 663 SourceManager &SourceMgr, 664 FileManager &FileMgr, 665 const PreprocessorOptions &InitOpts) { 666 // Remap files in the source manager (with buffers). 667 for (PreprocessorOptions::const_remapped_file_buffer_iterator 668 Remap = InitOpts.remapped_file_buffer_begin(), 669 RemapEnd = InitOpts.remapped_file_buffer_end(); 670 Remap != RemapEnd; 671 ++Remap) { 672 // Create the file entry for the file that we're mapping from. 673 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 674 Remap->second->getBufferSize(), 675 0); 676 if (!FromFile) { 677 Diags.Report(diag::err_fe_remap_missing_from_file) 678 << Remap->first; 679 if (!InitOpts.RetainRemappedFileBuffers) 680 delete Remap->second; 681 continue; 682 } 683 684 // Override the contents of the "from" file with the contents of 685 // the "to" file. 686 SourceMgr.overrideFileContents(FromFile, Remap->second, 687 InitOpts.RetainRemappedFileBuffers); 688 } 689 690 // Remap files in the source manager (with other files). 691 for (PreprocessorOptions::const_remapped_file_iterator 692 Remap = InitOpts.remapped_file_begin(), 693 RemapEnd = InitOpts.remapped_file_end(); 694 Remap != RemapEnd; 695 ++Remap) { 696 // Find the file that we're mapping to. 697 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 698 if (!ToFile) { 699 Diags.Report(diag::err_fe_remap_missing_to_file) 700 << Remap->first << Remap->second; 701 continue; 702 } 703 704 // Create the file entry for the file that we're mapping from. 705 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 706 ToFile->getSize(), 0); 707 if (!FromFile) { 708 Diags.Report(diag::err_fe_remap_missing_from_file) 709 << Remap->first; 710 continue; 711 } 712 713 // Override the contents of the "from" file with the contents of 714 // the "to" file. 715 SourceMgr.overrideFileContents(FromFile, ToFile); 716 } 717 718 SourceMgr.setOverridenFilesKeepOriginalName( 719 InitOpts.RemappedFilesKeepOriginalName); 720 } 721 722 /// InitializePreprocessor - Initialize the preprocessor getting it and the 723 /// environment ready to process a single file. This returns true on error. 724 /// 725 void clang::InitializePreprocessor(Preprocessor &PP, 726 const PreprocessorOptions &InitOpts, 727 const HeaderSearchOptions &HSOpts, 728 const FrontendOptions &FEOpts) { 729 const LangOptions &LangOpts = PP.getLangOpts(); 730 std::string PredefineBuffer; 731 PredefineBuffer.reserve(4080); 732 llvm::raw_string_ostream Predefines(PredefineBuffer); 733 MacroBuilder Builder(Predefines); 734 735 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 736 PP.getFileManager(), InitOpts); 737 738 // Emit line markers for various builtin sections of the file. We don't do 739 // this in asm preprocessor mode, because "# 4" is not a line marker directive 740 // in this mode. 741 if (!PP.getLangOpts().AsmPreprocessor) 742 Builder.append("# 1 \"<built-in>\" 3"); 743 744 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 745 if (InitOpts.UsePredefines) { 746 InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder); 747 748 // Install definitions to make Objective-C++ ARC work well with various 749 // C++ Standard Library implementations. 750 if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) { 751 switch (InitOpts.ObjCXXARCStandardLibrary) { 752 case ARCXX_nolib: 753 case ARCXX_libcxx: 754 break; 755 756 case ARCXX_libstdcxx: 757 AddObjCXXARCLibstdcxxDefines(LangOpts, Builder); 758 break; 759 } 760 } 761 } 762 763 // Even with predefines off, some macros are still predefined. 764 // These should all be defined in the preprocessor according to the 765 // current language configuration. 766 InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(), 767 FEOpts, Builder); 768 769 // Add on the predefines from the driver. Wrap in a #line directive to report 770 // that they come from the command line. 771 if (!PP.getLangOpts().AsmPreprocessor) 772 Builder.append("# 1 \"<command line>\" 1"); 773 774 // Process #define's and #undef's in the order they are given. 775 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 776 if (InitOpts.Macros[i].second) // isUndef 777 Builder.undefineMacro(InitOpts.Macros[i].first); 778 else 779 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 780 PP.getDiagnostics()); 781 } 782 783 // If -imacros are specified, include them now. These are processed before 784 // any -include directives. 785 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 786 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i], 787 PP.getFileManager()); 788 789 // Process -include-pch/-include-pth directives. 790 if (!InitOpts.ImplicitPCHInclude.empty()) 791 AddImplicitIncludePCH(Builder, PP, InitOpts.ImplicitPCHInclude); 792 if (!InitOpts.ImplicitPTHInclude.empty()) 793 AddImplicitIncludePTH(Builder, PP, InitOpts.ImplicitPTHInclude); 794 795 // Process -include directives. 796 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 797 const std::string &Path = InitOpts.Includes[i]; 798 AddImplicitInclude(Builder, Path, PP.getFileManager()); 799 } 800 801 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 802 if (!PP.getLangOpts().AsmPreprocessor) 803 Builder.append("# 1 \"<built-in>\" 2"); 804 805 // Instruct the preprocessor to skip the preamble. 806 PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, 807 InitOpts.PrecompiledPreambleBytes.second); 808 809 // Copy PredefinedBuffer into the Preprocessor. 810 PP.setPredefines(Predefines.str()); 811 812 // Initialize the header search object. 813 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 814 PP.getLangOpts(), 815 PP.getTargetInfo().getTriple()); 816 } 817