InitPreprocessor.cpp revision 234353
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" 29using 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=". 34static 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. 54static void AddImplicitInclude(MacroBuilder &Builder, StringRef File, 55 FileManager &FileMgr) { 56 Builder.append(Twine("#include \"") + 57 HeaderSearch::NormalizeDashIncludePath(File, FileMgr) + "\""); 58} 59 60static 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. 71static 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. 88template <typename T> 89static 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 104static 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). 156static 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 166static 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 172static void DefineType(const Twine &MacroName, TargetInfo::IntType Ty, 173 MacroBuilder &Builder) { 174 Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty)); 175} 176 177static void DefineTypeWidth(StringRef MacroName, TargetInfo::IntType Ty, 178 const TargetInfo &TI, MacroBuilder &Builder) { 179 Builder.defineMacro(MacroName, Twine(TI.getTypeWidth(Ty))); 180} 181 182static void DefineTypeSizeof(StringRef MacroName, unsigned BitWidth, 183 const TargetInfo &TI, MacroBuilder &Builder) { 184 Builder.defineMacro(MacroName, 185 Twine(BitWidth / TI.getCharWidth())); 186} 187 188static 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. 207static 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). 221static 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 272static 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 if (LangOpts.GNUMode) 292 Builder.defineMacro("__cplusplus"); 293 else { 294 // C++0x [cpp.predefined]p1: 295 // The name_ _cplusplus is defined to the value 201103L when compiling a 296 // C++ translation unit. 297 if (LangOpts.CPlusPlus0x) 298 Builder.defineMacro("__cplusplus", "201103L"); 299 // C++03 [cpp.predefined]p1: 300 // The name_ _cplusplus is defined to the value 199711L when compiling a 301 // C++ translation unit. 302 else 303 Builder.defineMacro("__cplusplus", "199711L"); 304 } 305 } 306 307 if (LangOpts.ObjC1) 308 Builder.defineMacro("__OBJC__"); 309 310 // Not "standard" per se, but available even with the -undef flag. 311 if (LangOpts.AsmPreprocessor) 312 Builder.defineMacro("__ASSEMBLER__"); 313} 314 315static void InitializePredefinedMacros(const TargetInfo &TI, 316 const LangOptions &LangOpts, 317 const FrontendOptions &FEOpts, 318 MacroBuilder &Builder) { 319 // Compiler version introspection macros. 320 Builder.defineMacro("__llvm__"); // LLVM Backend 321 Builder.defineMacro("__clang__"); // Clang Frontend 322#define TOSTR2(X) #X 323#define TOSTR(X) TOSTR2(X) 324 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 325 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 326#ifdef CLANG_VERSION_PATCHLEVEL 327 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 328#else 329 Builder.defineMacro("__clang_patchlevel__", "0"); 330#endif 331 Builder.defineMacro("__clang_version__", 332 "\"" CLANG_VERSION_STRING " (" 333 + getClangFullRepositoryVersion() + ")\""); 334#undef TOSTR 335#undef TOSTR2 336 if (!LangOpts.MicrosoftMode) { 337 // Currently claim to be compatible with GCC 4.2.1-5621, but only if we're 338 // not compiling for MSVC compatibility 339 Builder.defineMacro("__GNUC_MINOR__", "2"); 340 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 341 Builder.defineMacro("__GNUC__", "4"); 342 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 343 } 344 345 // Define macros for the C11 / C++11 memory orderings 346 Builder.defineMacro("__ATOMIC_RELAXED", "0"); 347 Builder.defineMacro("__ATOMIC_CONSUME", "1"); 348 Builder.defineMacro("__ATOMIC_ACQUIRE", "2"); 349 Builder.defineMacro("__ATOMIC_RELEASE", "3"); 350 Builder.defineMacro("__ATOMIC_ACQ_REL", "4"); 351 Builder.defineMacro("__ATOMIC_SEQ_CST", "5"); 352 353 // Support for #pragma redefine_extname (Sun compatibility) 354 Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1"); 355 356 // As sad as it is, enough software depends on the __VERSION__ for version 357 // checks that it is necessary to report 4.2.1 (the base GCC version we claim 358 // compatibility with) first. 359 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " + 360 Twine(getClangFullCPPVersion()) + "\""); 361 362 // Initialize language-specific preprocessor defines. 363 364 // Standard conforming mode? 365 if (!LangOpts.GNUMode) 366 Builder.defineMacro("__STRICT_ANSI__"); 367 368 if (LangOpts.CPlusPlus0x) 369 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 370 371 if (LangOpts.ObjC1) { 372 if (LangOpts.ObjCNonFragileABI) { 373 Builder.defineMacro("__OBJC2__"); 374 375 if (LangOpts.ObjCExceptions) 376 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 377 } 378 379 if (LangOpts.getGC() != LangOptions::NonGC) 380 Builder.defineMacro("__OBJC_GC__"); 381 382 if (LangOpts.NeXTRuntime) 383 Builder.defineMacro("__NEXT_RUNTIME__"); 384 } 385 386 // darwin_constant_cfstrings controls this. This is also dependent 387 // on other things like the runtime I believe. This is set even for C code. 388 if (!LangOpts.NoConstantCFStrings) 389 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 390 391 if (LangOpts.ObjC2) 392 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 393 394 if (LangOpts.PascalStrings) 395 Builder.defineMacro("__PASCAL_STRINGS__"); 396 397 if (LangOpts.Blocks) { 398 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 399 Builder.defineMacro("__BLOCKS__"); 400 } 401 402 if (LangOpts.CXXExceptions) 403 Builder.defineMacro("__EXCEPTIONS"); 404 if (LangOpts.RTTI) 405 Builder.defineMacro("__GXX_RTTI"); 406 if (LangOpts.SjLjExceptions) 407 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 408 409 if (LangOpts.Deprecated) 410 Builder.defineMacro("__DEPRECATED"); 411 412 if (LangOpts.CPlusPlus) { 413 Builder.defineMacro("__GNUG__", "4"); 414 Builder.defineMacro("__GXX_WEAK__"); 415 Builder.defineMacro("__private_extern__", "extern"); 416 } 417 418 if (LangOpts.MicrosoftExt) { 419 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 420 // VC++ appears to only like __FUNCTION__. 421 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 422 // Work around some issues with Visual C++ headerws. 423 if (LangOpts.CPlusPlus) { 424 // Since we define wchar_t in C++ mode. 425 Builder.defineMacro("_WCHAR_T_DEFINED"); 426 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 427 // FIXME: Support Microsoft's __identifier extension in the lexer. 428 Builder.append("#define __identifier(x) x"); 429 Builder.append("class type_info;"); 430 } 431 432 if (LangOpts.CPlusPlus0x) { 433 Builder.defineMacro("_HAS_CHAR16_T_LANGUAGE_SUPPORT", "1"); 434 } 435 } 436 437 if (LangOpts.Optimize) 438 Builder.defineMacro("__OPTIMIZE__"); 439 if (LangOpts.OptimizeSize) 440 Builder.defineMacro("__OPTIMIZE_SIZE__"); 441 442 if (LangOpts.FastMath) 443 Builder.defineMacro("__FAST_MATH__"); 444 445 // Initialize target-specific preprocessor defines. 446 447 // Define type sizing macros based on the target properties. 448 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 449 Builder.defineMacro("__CHAR_BIT__", "8"); 450 451 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 452 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 453 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 454 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 455 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 456 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 457 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 458 459 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 460 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 461 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 462 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 463 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 464 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 465 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 466 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 467 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 468 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 469 DefineTypeSizeof("__SIZEOF_SIZE_T__", 470 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 471 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 472 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 473 DefineTypeSizeof("__SIZEOF_WINT_T__", 474 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 475 476 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 477 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 478 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 479 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 480 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 481 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 482 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 483 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 484 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 485 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 486 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 487 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 488 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 489 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 490 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 491 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 492 493 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); 494 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); 495 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); 496 497 // Define a __POINTER_WIDTH__ macro for stdint.h. 498 Builder.defineMacro("__POINTER_WIDTH__", 499 Twine((int)TI.getPointerWidth(0))); 500 501 if (!LangOpts.CharIsSigned) 502 Builder.defineMacro("__CHAR_UNSIGNED__"); 503 504 if (!TargetInfo::isTypeSigned(TI.getWIntType())) 505 Builder.defineMacro("__WINT_UNSIGNED__"); 506 507 // Define exact-width integer types for stdint.h 508 Builder.defineMacro("__INT" + Twine(TI.getCharWidth()) + "_TYPE__", 509 "char"); 510 511 if (TI.getShortWidth() > TI.getCharWidth()) 512 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 513 514 if (TI.getIntWidth() > TI.getShortWidth()) 515 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 516 517 if (TI.getLongWidth() > TI.getIntWidth()) 518 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 519 520 if (TI.getLongLongWidth() > TI.getLongWidth()) 521 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 522 523 // Add __builtin_va_list typedef. 524 Builder.append(TI.getVAListDeclaration()); 525 526 if (const char *Prefix = TI.getUserLabelPrefix()) 527 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 528 529 // Build configuration options. FIXME: these should be controlled by 530 // command line options or something. 531 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 532 533 if (LangOpts.GNUInline) 534 Builder.defineMacro("__GNUC_GNU_INLINE__"); 535 else 536 Builder.defineMacro("__GNUC_STDC_INLINE__"); 537 538 // The value written by __atomic_test_and_set. 539 // FIXME: This is target-dependent. 540 Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1"); 541 542 // Used by libstdc++ to implement ATOMIC_<foo>_LOCK_FREE. 543 unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth(); 544#define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \ 545 Builder.defineMacro("__GCC_ATOMIC_" #TYPE "_LOCK_FREE", \ 546 getLockFreeValue(TI.get##Type##Width(), \ 547 TI.get##Type##Align(), \ 548 InlineWidthBits)); 549 DEFINE_LOCK_FREE_MACRO(BOOL, Bool); 550 DEFINE_LOCK_FREE_MACRO(CHAR, Char); 551 DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16); 552 DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32); 553 DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar); 554 DEFINE_LOCK_FREE_MACRO(SHORT, Short); 555 DEFINE_LOCK_FREE_MACRO(INT, Int); 556 DEFINE_LOCK_FREE_MACRO(LONG, Long); 557 DEFINE_LOCK_FREE_MACRO(LLONG, LongLong); 558 Builder.defineMacro("__GCC_ATOMIC_POINTER_LOCK_FREE", 559 getLockFreeValue(TI.getPointerWidth(0), 560 TI.getPointerAlign(0), 561 InlineWidthBits)); 562#undef DEFINE_LOCK_FREE_MACRO 563 564 if (LangOpts.NoInlineDefine) 565 Builder.defineMacro("__NO_INLINE__"); 566 567 if (unsigned PICLevel = LangOpts.PICLevel) { 568 Builder.defineMacro("__PIC__", Twine(PICLevel)); 569 Builder.defineMacro("__pic__", Twine(PICLevel)); 570 } 571 if (unsigned PIELevel = LangOpts.PIELevel) { 572 Builder.defineMacro("__PIE__", Twine(PIELevel)); 573 Builder.defineMacro("__pie__", Twine(PIELevel)); 574 } 575 576 // Macros to control C99 numerics and <float.h> 577 Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod())); 578 Builder.defineMacro("__FLT_RADIX__", "2"); 579 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 580 Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig)); 581 582 if (LangOpts.getStackProtector() == LangOptions::SSPOn) 583 Builder.defineMacro("__SSP__"); 584 else if (LangOpts.getStackProtector() == LangOptions::SSPReq) 585 Builder.defineMacro("__SSP_ALL__", "2"); 586 587 if (FEOpts.ProgramAction == frontend::RewriteObjC) 588 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 589 590 // Define a macro that exists only when using the static analyzer. 591 if (FEOpts.ProgramAction == frontend::RunAnalysis) 592 Builder.defineMacro("__clang_analyzer__"); 593 594 if (LangOpts.FastRelaxedMath) 595 Builder.defineMacro("__FAST_RELAXED_MATH__"); 596 597 if (LangOpts.ObjCAutoRefCount) { 598 Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))"); 599 Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))"); 600 Builder.defineMacro("__autoreleasing", 601 "__attribute__((objc_ownership(autoreleasing)))"); 602 Builder.defineMacro("__unsafe_unretained", 603 "__attribute__((objc_ownership(none)))"); 604 } 605 606 // Get other target #defines. 607 TI.getTargetDefines(LangOpts, Builder); 608} 609 610// Initialize the remapping of files to alternative contents, e.g., 611// those specified through other files. 612static void InitializeFileRemapping(DiagnosticsEngine &Diags, 613 SourceManager &SourceMgr, 614 FileManager &FileMgr, 615 const PreprocessorOptions &InitOpts) { 616 // Remap files in the source manager (with buffers). 617 for (PreprocessorOptions::const_remapped_file_buffer_iterator 618 Remap = InitOpts.remapped_file_buffer_begin(), 619 RemapEnd = InitOpts.remapped_file_buffer_end(); 620 Remap != RemapEnd; 621 ++Remap) { 622 // Create the file entry for the file that we're mapping from. 623 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 624 Remap->second->getBufferSize(), 625 0); 626 if (!FromFile) { 627 Diags.Report(diag::err_fe_remap_missing_from_file) 628 << Remap->first; 629 if (!InitOpts.RetainRemappedFileBuffers) 630 delete Remap->second; 631 continue; 632 } 633 634 // Override the contents of the "from" file with the contents of 635 // the "to" file. 636 SourceMgr.overrideFileContents(FromFile, Remap->second, 637 InitOpts.RetainRemappedFileBuffers); 638 } 639 640 // Remap files in the source manager (with other files). 641 for (PreprocessorOptions::const_remapped_file_iterator 642 Remap = InitOpts.remapped_file_begin(), 643 RemapEnd = InitOpts.remapped_file_end(); 644 Remap != RemapEnd; 645 ++Remap) { 646 // Find the file that we're mapping to. 647 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 648 if (!ToFile) { 649 Diags.Report(diag::err_fe_remap_missing_to_file) 650 << Remap->first << Remap->second; 651 continue; 652 } 653 654 // Create the file entry for the file that we're mapping from. 655 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 656 ToFile->getSize(), 0); 657 if (!FromFile) { 658 Diags.Report(diag::err_fe_remap_missing_from_file) 659 << Remap->first; 660 continue; 661 } 662 663 // Override the contents of the "from" file with the contents of 664 // the "to" file. 665 SourceMgr.overrideFileContents(FromFile, ToFile); 666 } 667 668 SourceMgr.setOverridenFilesKeepOriginalName( 669 InitOpts.RemappedFilesKeepOriginalName); 670} 671 672/// InitializePreprocessor - Initialize the preprocessor getting it and the 673/// environment ready to process a single file. This returns true on error. 674/// 675void clang::InitializePreprocessor(Preprocessor &PP, 676 const PreprocessorOptions &InitOpts, 677 const HeaderSearchOptions &HSOpts, 678 const FrontendOptions &FEOpts) { 679 const LangOptions &LangOpts = PP.getLangOpts(); 680 std::string PredefineBuffer; 681 PredefineBuffer.reserve(4080); 682 llvm::raw_string_ostream Predefines(PredefineBuffer); 683 MacroBuilder Builder(Predefines); 684 685 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 686 PP.getFileManager(), InitOpts); 687 688 // Emit line markers for various builtin sections of the file. We don't do 689 // this in asm preprocessor mode, because "# 4" is not a line marker directive 690 // in this mode. 691 if (!PP.getLangOpts().AsmPreprocessor) 692 Builder.append("# 1 \"<built-in>\" 3"); 693 694 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 695 if (InitOpts.UsePredefines) { 696 InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder); 697 698 // Install definitions to make Objective-C++ ARC work well with various 699 // C++ Standard Library implementations. 700 if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) { 701 switch (InitOpts.ObjCXXARCStandardLibrary) { 702 case ARCXX_nolib: 703 case ARCXX_libcxx: 704 break; 705 706 case ARCXX_libstdcxx: 707 AddObjCXXARCLibstdcxxDefines(LangOpts, Builder); 708 break; 709 } 710 } 711 } 712 713 // Even with predefines off, some macros are still predefined. 714 // These should all be defined in the preprocessor according to the 715 // current language configuration. 716 InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(), 717 FEOpts, Builder); 718 719 // Add on the predefines from the driver. Wrap in a #line directive to report 720 // that they come from the command line. 721 if (!PP.getLangOpts().AsmPreprocessor) 722 Builder.append("# 1 \"<command line>\" 1"); 723 724 // Process #define's and #undef's in the order they are given. 725 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 726 if (InitOpts.Macros[i].second) // isUndef 727 Builder.undefineMacro(InitOpts.Macros[i].first); 728 else 729 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 730 PP.getDiagnostics()); 731 } 732 733 // If -imacros are specified, include them now. These are processed before 734 // any -include directives. 735 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 736 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i], 737 PP.getFileManager()); 738 739 // Process -include directives. 740 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 741 const std::string &Path = InitOpts.Includes[i]; 742 if (Path == InitOpts.ImplicitPTHInclude) 743 AddImplicitIncludePTH(Builder, PP, Path); 744 else 745 AddImplicitInclude(Builder, Path, PP.getFileManager()); 746 } 747 748 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 749 if (!PP.getLangOpts().AsmPreprocessor) 750 Builder.append("# 1 \"<built-in>\" 2"); 751 752 // Instruct the preprocessor to skip the preamble. 753 PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, 754 InitOpts.PrecompiledPreambleBytes.second); 755 756 // Copy PredefinedBuffer into the Preprocessor. 757 PP.setPredefines(Predefines.str()); 758 759 // Initialize the header search object. 760 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 761 PP.getLangOpts(), 762 PP.getTargetInfo().getTriple()); 763} 764