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: LangOpts.CPlusPlus1y 306 307 // C++11 [cpp.predefined]p1: 308 // The name __cplusplus is defined to the value 201103L when compiling a 309 // C++ translation unit. 310 if (LangOpts.CPlusPlus11) 311 Builder.defineMacro("__cplusplus", "201103L"); 312 // C++03 [cpp.predefined]p1: 313 // The name __cplusplus is defined to the value 199711L when compiling a 314 // C++ translation unit. 315 else 316 Builder.defineMacro("__cplusplus", "199711L"); 317 } 318 319 if (LangOpts.ObjC1) 320 Builder.defineMacro("__OBJC__"); 321 322 // Not "standard" per se, but available even with the -undef flag. 323 if (LangOpts.AsmPreprocessor) 324 Builder.defineMacro("__ASSEMBLER__"); 325 } 326 327 static void InitializePredefinedMacros(const TargetInfo &TI, 328 const LangOptions &LangOpts, 329 const FrontendOptions &FEOpts, 330 MacroBuilder &Builder) { 331 // Compiler version introspection macros. 332 Builder.defineMacro("__llvm__"); // LLVM Backend 333 Builder.defineMacro("__clang__"); // Clang Frontend 334 #define TOSTR2(X) #X 335 #define TOSTR(X) TOSTR2(X) 336 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 337 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 338 #ifdef CLANG_VERSION_PATCHLEVEL 339 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 340 #else 341 Builder.defineMacro("__clang_patchlevel__", "0"); 342 #endif 343 Builder.defineMacro("__clang_version__", 344 "\"" CLANG_VERSION_STRING " " 345 + getClangFullRepositoryVersion() + "\""); 346 #undef TOSTR 347 #undef TOSTR2 348 if (!LangOpts.MicrosoftMode) { 349 // Currently claim to be compatible with GCC 4.2.1-5621, but only if we're 350 // not compiling for MSVC compatibility 351 Builder.defineMacro("__GNUC_MINOR__", "2"); 352 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 353 Builder.defineMacro("__GNUC__", "4"); 354 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 355 } 356 357 // Define macros for the C11 / C++11 memory orderings 358 Builder.defineMacro("__ATOMIC_RELAXED", "0"); 359 Builder.defineMacro("__ATOMIC_CONSUME", "1"); 360 Builder.defineMacro("__ATOMIC_ACQUIRE", "2"); 361 Builder.defineMacro("__ATOMIC_RELEASE", "3"); 362 Builder.defineMacro("__ATOMIC_ACQ_REL", "4"); 363 Builder.defineMacro("__ATOMIC_SEQ_CST", "5"); 364 365 // Support for #pragma redefine_extname (Sun compatibility) 366 Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1"); 367 368 // As sad as it is, enough software depends on the __VERSION__ for version 369 // checks that it is necessary to report 4.2.1 (the base GCC version we claim 370 // compatibility with) first. 371 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " + 372 Twine(getClangFullCPPVersion()) + "\""); 373 374 // Initialize language-specific preprocessor defines. 375 376 // Standard conforming mode? 377 if (!LangOpts.GNUMode) 378 Builder.defineMacro("__STRICT_ANSI__"); 379 380 if (LangOpts.CPlusPlus11) 381 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 382 383 if (LangOpts.ObjC1) { 384 if (LangOpts.ObjCRuntime.isNonFragile()) { 385 Builder.defineMacro("__OBJC2__"); 386 387 if (LangOpts.ObjCExceptions) 388 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 389 } 390 391 if (LangOpts.getGC() != LangOptions::NonGC) 392 Builder.defineMacro("__OBJC_GC__"); 393 394 if (LangOpts.ObjCRuntime.isNeXTFamily()) 395 Builder.defineMacro("__NEXT_RUNTIME__"); 396 397 Builder.defineMacro("IBOutlet", "__attribute__((iboutlet))"); 398 Builder.defineMacro("IBOutletCollection(ClassName)", 399 "__attribute__((iboutletcollection(ClassName)))"); 400 Builder.defineMacro("IBAction", "void)__attribute__((ibaction)"); 401 } 402 403 // darwin_constant_cfstrings controls this. This is also dependent 404 // on other things like the runtime I believe. This is set even for C code. 405 if (!LangOpts.NoConstantCFStrings) 406 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 407 408 if (LangOpts.ObjC2) 409 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 410 411 if (LangOpts.PascalStrings) 412 Builder.defineMacro("__PASCAL_STRINGS__"); 413 414 if (LangOpts.Blocks) { 415 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 416 Builder.defineMacro("__BLOCKS__"); 417 } 418 419 if (LangOpts.CXXExceptions) 420 Builder.defineMacro("__EXCEPTIONS"); 421 if (LangOpts.RTTI) 422 Builder.defineMacro("__GXX_RTTI"); 423 if (LangOpts.SjLjExceptions) 424 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 425 426 if (LangOpts.Deprecated) 427 Builder.defineMacro("__DEPRECATED"); 428 429 if (LangOpts.CPlusPlus) { 430 Builder.defineMacro("__GNUG__", "4"); 431 Builder.defineMacro("__GXX_WEAK__"); 432 Builder.defineMacro("__private_extern__", "extern"); 433 } 434 435 if (LangOpts.MicrosoftExt) { 436 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 437 // VC++ appears to only like __FUNCTION__. 438 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 439 // Work around some issues with Visual C++ headers. 440 if (LangOpts.WChar) { 441 // wchar_t supported as a keyword. 442 Builder.defineMacro("_WCHAR_T_DEFINED"); 443 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 444 } 445 if (LangOpts.CPlusPlus) { 446 // FIXME: Support Microsoft's __identifier extension in the lexer. 447 Builder.append("#define __identifier(x) x"); 448 Builder.append("class type_info;"); 449 } 450 } 451 452 if (LangOpts.Optimize) 453 Builder.defineMacro("__OPTIMIZE__"); 454 if (LangOpts.OptimizeSize) 455 Builder.defineMacro("__OPTIMIZE_SIZE__"); 456 457 if (LangOpts.FastMath) 458 Builder.defineMacro("__FAST_MATH__"); 459 460 // Initialize target-specific preprocessor defines. 461 462 // __BYTE_ORDER__ was added in GCC 4.6. It's analogous 463 // to the macro __BYTE_ORDER (no trailing underscores) 464 // from glibc's <endian.h> header. 465 // We don't support the PDP-11 as a target, but include 466 // the define so it can still be compared against. 467 Builder.defineMacro("__ORDER_LITTLE_ENDIAN__", "1234"); 468 Builder.defineMacro("__ORDER_BIG_ENDIAN__", "4321"); 469 Builder.defineMacro("__ORDER_PDP_ENDIAN__", "3412"); 470 if (TI.isBigEndian()) 471 Builder.defineMacro("__BYTE_ORDER__", "__ORDER_BIG_ENDIAN__"); 472 else 473 Builder.defineMacro("__BYTE_ORDER__", "__ORDER_LITTLE_ENDIAN__"); 474 475 476 if (TI.getPointerWidth(0) == 64 && TI.getLongWidth() == 64 477 && TI.getIntWidth() == 32) { 478 Builder.defineMacro("_LP64"); 479 Builder.defineMacro("__LP64__"); 480 } 481 482 // Define type sizing macros based on the target properties. 483 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 484 Builder.defineMacro("__CHAR_BIT__", "8"); 485 486 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 487 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 488 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 489 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 490 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 491 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 492 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 493 494 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 495 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 496 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 497 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 498 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 499 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 500 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 501 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 502 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 503 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 504 DefineTypeSizeof("__SIZEOF_SIZE_T__", 505 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 506 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 507 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 508 DefineTypeSizeof("__SIZEOF_WINT_T__", 509 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 510 if (TI.hasInt128Type()) 511 DefineTypeSizeof("__SIZEOF_INT128__", 128, TI, Builder); 512 513 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 514 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 515 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 516 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 517 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 518 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 519 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 520 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 521 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 522 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 523 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 524 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 525 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 526 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 527 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 528 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 529 530 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat(), "F"); 531 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat(), ""); 532 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat(), "L"); 533 534 // Define a __POINTER_WIDTH__ macro for stdint.h. 535 Builder.defineMacro("__POINTER_WIDTH__", 536 Twine((int)TI.getPointerWidth(0))); 537 538 if (!LangOpts.CharIsSigned) 539 Builder.defineMacro("__CHAR_UNSIGNED__"); 540 541 if (!TargetInfo::isTypeSigned(TI.getWCharType())) 542 Builder.defineMacro("__WCHAR_UNSIGNED__"); 543 544 if (!TargetInfo::isTypeSigned(TI.getWIntType())) 545 Builder.defineMacro("__WINT_UNSIGNED__"); 546 547 // Define exact-width integer types for stdint.h 548 Builder.defineMacro("__INT" + Twine(TI.getCharWidth()) + "_TYPE__", 549 "char"); 550 551 if (TI.getShortWidth() > TI.getCharWidth()) 552 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 553 554 if (TI.getIntWidth() > TI.getShortWidth()) 555 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 556 557 if (TI.getLongWidth() > TI.getIntWidth()) 558 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 559 560 if (TI.getLongLongWidth() > TI.getLongWidth()) 561 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 562 563 if (const char *Prefix = TI.getUserLabelPrefix()) 564 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 565 566 if (LangOpts.FastMath || LangOpts.FiniteMathOnly) 567 Builder.defineMacro("__FINITE_MATH_ONLY__", "1"); 568 else 569 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 570 571 if (LangOpts.GNUInline) 572 Builder.defineMacro("__GNUC_GNU_INLINE__"); 573 else 574 Builder.defineMacro("__GNUC_STDC_INLINE__"); 575 576 // The value written by __atomic_test_and_set. 577 // FIXME: This is target-dependent. 578 Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1"); 579 580 // Used by libstdc++ to implement ATOMIC_<foo>_LOCK_FREE. 581 unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth(); 582 #define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \ 583 Builder.defineMacro("__GCC_ATOMIC_" #TYPE "_LOCK_FREE", \ 584 getLockFreeValue(TI.get##Type##Width(), \ 585 TI.get##Type##Align(), \ 586 InlineWidthBits)); 587 DEFINE_LOCK_FREE_MACRO(BOOL, Bool); 588 DEFINE_LOCK_FREE_MACRO(CHAR, Char); 589 DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16); 590 DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32); 591 DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar); 592 DEFINE_LOCK_FREE_MACRO(SHORT, Short); 593 DEFINE_LOCK_FREE_MACRO(INT, Int); 594 DEFINE_LOCK_FREE_MACRO(LONG, Long); 595 DEFINE_LOCK_FREE_MACRO(LLONG, LongLong); 596 Builder.defineMacro("__GCC_ATOMIC_POINTER_LOCK_FREE", 597 getLockFreeValue(TI.getPointerWidth(0), 598 TI.getPointerAlign(0), 599 InlineWidthBits)); 600 #undef DEFINE_LOCK_FREE_MACRO 601 602 if (LangOpts.NoInlineDefine) 603 Builder.defineMacro("__NO_INLINE__"); 604 605 if (unsigned PICLevel = LangOpts.PICLevel) { 606 Builder.defineMacro("__PIC__", Twine(PICLevel)); 607 Builder.defineMacro("__pic__", Twine(PICLevel)); 608 } 609 if (unsigned PIELevel = LangOpts.PIELevel) { 610 Builder.defineMacro("__PIE__", Twine(PIELevel)); 611 Builder.defineMacro("__pie__", Twine(PIELevel)); 612 } 613 614 // Macros to control C99 numerics and <float.h> 615 Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod())); 616 Builder.defineMacro("__FLT_RADIX__", "2"); 617 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 618 Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig)); 619 620 if (LangOpts.getStackProtector() == LangOptions::SSPOn) 621 Builder.defineMacro("__SSP__"); 622 else if (LangOpts.getStackProtector() == LangOptions::SSPReq) 623 Builder.defineMacro("__SSP_ALL__", "2"); 624 625 if (FEOpts.ProgramAction == frontend::RewriteObjC) 626 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 627 628 // Define a macro that exists only when using the static analyzer. 629 if (FEOpts.ProgramAction == frontend::RunAnalysis) 630 Builder.defineMacro("__clang_analyzer__"); 631 632 if (LangOpts.FastRelaxedMath) 633 Builder.defineMacro("__FAST_RELAXED_MATH__"); 634 635 if (LangOpts.ObjCAutoRefCount) { 636 Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))"); 637 Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))"); 638 Builder.defineMacro("__autoreleasing", 639 "__attribute__((objc_ownership(autoreleasing)))"); 640 Builder.defineMacro("__unsafe_unretained", 641 "__attribute__((objc_ownership(none)))"); 642 } 643 644 // OpenMP definition 645 if (LangOpts.OpenMP) { 646 // OpenMP 2.2: 647 // In implementations that support a preprocessor, the _OPENMP 648 // macro name is defined to have the decimal value yyyymm where 649 // yyyy and mm are the year and the month designations of the 650 // version of the OpenMP API that the implementation support. 651 Builder.defineMacro("_OPENMP", "201107"); 652 } 653 654 // Get other target #defines. 655 TI.getTargetDefines(LangOpts, Builder); 656 } 657 658 // Initialize the remapping of files to alternative contents, e.g., 659 // those specified through other files. 660 static void InitializeFileRemapping(DiagnosticsEngine &Diags, 661 SourceManager &SourceMgr, 662 FileManager &FileMgr, 663 const PreprocessorOptions &InitOpts) { 664 // Remap files in the source manager (with buffers). 665 for (PreprocessorOptions::const_remapped_file_buffer_iterator 666 Remap = InitOpts.remapped_file_buffer_begin(), 667 RemapEnd = InitOpts.remapped_file_buffer_end(); 668 Remap != RemapEnd; 669 ++Remap) { 670 // Create the file entry for the file that we're mapping from. 671 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 672 Remap->second->getBufferSize(), 673 0); 674 if (!FromFile) { 675 Diags.Report(diag::err_fe_remap_missing_from_file) 676 << Remap->first; 677 if (!InitOpts.RetainRemappedFileBuffers) 678 delete Remap->second; 679 continue; 680 } 681 682 // Override the contents of the "from" file with the contents of 683 // the "to" file. 684 SourceMgr.overrideFileContents(FromFile, Remap->second, 685 InitOpts.RetainRemappedFileBuffers); 686 } 687 688 // Remap files in the source manager (with other files). 689 for (PreprocessorOptions::const_remapped_file_iterator 690 Remap = InitOpts.remapped_file_begin(), 691 RemapEnd = InitOpts.remapped_file_end(); 692 Remap != RemapEnd; 693 ++Remap) { 694 // Find the file that we're mapping to. 695 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 696 if (!ToFile) { 697 Diags.Report(diag::err_fe_remap_missing_to_file) 698 << Remap->first << Remap->second; 699 continue; 700 } 701 702 // Create the file entry for the file that we're mapping from. 703 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 704 ToFile->getSize(), 0); 705 if (!FromFile) { 706 Diags.Report(diag::err_fe_remap_missing_from_file) 707 << Remap->first; 708 continue; 709 } 710 711 // Override the contents of the "from" file with the contents of 712 // the "to" file. 713 SourceMgr.overrideFileContents(FromFile, ToFile); 714 } 715 716 SourceMgr.setOverridenFilesKeepOriginalName( 717 InitOpts.RemappedFilesKeepOriginalName); 718 } 719 720 /// InitializePreprocessor - Initialize the preprocessor getting it and the 721 /// environment ready to process a single file. This returns true on error. 722 /// 723 void clang::InitializePreprocessor(Preprocessor &PP, 724 const PreprocessorOptions &InitOpts, 725 const HeaderSearchOptions &HSOpts, 726 const FrontendOptions &FEOpts) { 727 const LangOptions &LangOpts = PP.getLangOpts(); 728 std::string PredefineBuffer; 729 PredefineBuffer.reserve(4080); 730 llvm::raw_string_ostream Predefines(PredefineBuffer); 731 MacroBuilder Builder(Predefines); 732 733 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 734 PP.getFileManager(), InitOpts); 735 736 // Emit line markers for various builtin sections of the file. We don't do 737 // this in asm preprocessor mode, because "# 4" is not a line marker directive 738 // in this mode. 739 if (!PP.getLangOpts().AsmPreprocessor) 740 Builder.append("# 1 \"<built-in>\" 3"); 741 742 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 743 if (InitOpts.UsePredefines) { 744 InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder); 745 746 // Install definitions to make Objective-C++ ARC work well with various 747 // C++ Standard Library implementations. 748 if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) { 749 switch (InitOpts.ObjCXXARCStandardLibrary) { 750 case ARCXX_nolib: 751 case ARCXX_libcxx: 752 break; 753 754 case ARCXX_libstdcxx: 755 AddObjCXXARCLibstdcxxDefines(LangOpts, Builder); 756 break; 757 } 758 } 759 } 760 761 // Even with predefines off, some macros are still predefined. 762 // These should all be defined in the preprocessor according to the 763 // current language configuration. 764 InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(), 765 FEOpts, Builder); 766 767 // Add on the predefines from the driver. Wrap in a #line directive to report 768 // that they come from the command line. 769 if (!PP.getLangOpts().AsmPreprocessor) 770 Builder.append("# 1 \"<command line>\" 1"); 771 772 // Process #define's and #undef's in the order they are given. 773 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 774 if (InitOpts.Macros[i].second) // isUndef 775 Builder.undefineMacro(InitOpts.Macros[i].first); 776 else 777 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 778 PP.getDiagnostics()); 779 } 780 781 // If -imacros are specified, include them now. These are processed before 782 // any -include directives. 783 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 784 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i], 785 PP.getFileManager()); 786 787 // Process -include-pch/-include-pth directives. 788 if (!InitOpts.ImplicitPCHInclude.empty()) 789 AddImplicitIncludePCH(Builder, PP, InitOpts.ImplicitPCHInclude); 790 if (!InitOpts.ImplicitPTHInclude.empty()) 791 AddImplicitIncludePTH(Builder, PP, InitOpts.ImplicitPTHInclude); 792 793 // Process -include directives. 794 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 795 const std::string &Path = InitOpts.Includes[i]; 796 AddImplicitInclude(Builder, Path, PP.getFileManager()); 797 } 798 799 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 800 if (!PP.getLangOpts().AsmPreprocessor) 801 Builder.append("# 1 \"<built-in>\" 2"); 802 803 // Instruct the preprocessor to skip the preamble. 804 PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, 805 InitOpts.PrecompiledPreambleBytes.second); 806 807 // Copy PredefinedBuffer into the Preprocessor. 808 PP.setPredefines(Predefines.str()); 809 810 // Initialize the header search object. 811 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 812 PP.getLangOpts(), 813 PP.getTargetInfo().getTriple()); 814 } 815