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.ObjCARCWeak) { 251 Out << "template<typename _Tp>\n" 252 << "struct __is_scalar<__attribute__((objc_ownership(weak))) _Tp> {\n" 253 << " enum { __value = 0 };\n" 254 << " typedef __false_type __type;\n" 255 << "};\n" 256 << "\n"; 257 } 258 259 Out << "template<typename _Tp>\n" 260 << "struct __is_scalar<__attribute__((objc_ownership(autoreleasing)))" 261 << " _Tp> {\n" 262 << " enum { __value = 0 };\n" 263 << " typedef __false_type __type;\n" 264 << "};\n" 265 << "\n"; 266 267 Out << "}\n"; 268 } 269 Builder.append(Result); 270} 271 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 // C++11 [cpp.predefined]p1: 292 // The name __cplusplus is defined to the value 201103L when compiling a 293 // C++ translation unit. 294 if (LangOpts.CPlusPlus0x) 295 Builder.defineMacro("__cplusplus", "201103L"); 296 // C++03 [cpp.predefined]p1: 297 // The name __cplusplus is defined to the value 199711L when compiling a 298 // C++ translation unit. 299 else 300 Builder.defineMacro("__cplusplus", "199711L"); 301 } 302 303 if (LangOpts.ObjC1) 304 Builder.defineMacro("__OBJC__"); 305 306 // Not "standard" per se, but available even with the -undef flag. 307 if (LangOpts.AsmPreprocessor) 308 Builder.defineMacro("__ASSEMBLER__"); 309} 310 311static void InitializePredefinedMacros(const TargetInfo &TI, 312 const LangOptions &LangOpts, 313 const FrontendOptions &FEOpts, 314 MacroBuilder &Builder) { 315 // Compiler version introspection macros. 316 Builder.defineMacro("__llvm__"); // LLVM Backend 317 Builder.defineMacro("__clang__"); // Clang Frontend 318#define TOSTR2(X) #X 319#define TOSTR(X) TOSTR2(X) 320 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 321 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 322#ifdef CLANG_VERSION_PATCHLEVEL 323 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 324#else 325 Builder.defineMacro("__clang_patchlevel__", "0"); 326#endif 327 Builder.defineMacro("__clang_version__", 328 "\"" CLANG_VERSION_STRING " (" 329 + getClangFullRepositoryVersion() + ")\""); 330#undef TOSTR 331#undef TOSTR2 332 if (!LangOpts.MicrosoftMode) { 333 // Currently claim to be compatible with GCC 4.2.1-5621, but only if we're 334 // not compiling for MSVC compatibility 335 Builder.defineMacro("__GNUC_MINOR__", "2"); 336 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 337 Builder.defineMacro("__GNUC__", "4"); 338 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 339 } 340 341 // Define macros for the C11 / C++11 memory orderings 342 Builder.defineMacro("__ATOMIC_RELAXED", "0"); 343 Builder.defineMacro("__ATOMIC_CONSUME", "1"); 344 Builder.defineMacro("__ATOMIC_ACQUIRE", "2"); 345 Builder.defineMacro("__ATOMIC_RELEASE", "3"); 346 Builder.defineMacro("__ATOMIC_ACQ_REL", "4"); 347 Builder.defineMacro("__ATOMIC_SEQ_CST", "5"); 348 349 // Support for #pragma redefine_extname (Sun compatibility) 350 Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1"); 351 352 // As sad as it is, enough software depends on the __VERSION__ for version 353 // checks that it is necessary to report 4.2.1 (the base GCC version we claim 354 // compatibility with) first. 355 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible " + 356 Twine(getClangFullCPPVersion()) + "\""); 357 358 // Initialize language-specific preprocessor defines. 359 360 // Standard conforming mode? 361 if (!LangOpts.GNUMode) 362 Builder.defineMacro("__STRICT_ANSI__"); 363 364 if (LangOpts.CPlusPlus0x) 365 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 366 367 if (LangOpts.ObjC1) { 368 if (LangOpts.ObjCRuntime.isNonFragile()) { 369 Builder.defineMacro("__OBJC2__"); 370 371 if (LangOpts.ObjCExceptions) 372 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 373 } 374 375 if (LangOpts.getGC() != LangOptions::NonGC) 376 Builder.defineMacro("__OBJC_GC__"); 377 378 if (LangOpts.ObjCRuntime.isNeXTFamily()) 379 Builder.defineMacro("__NEXT_RUNTIME__"); 380 381 Builder.defineMacro("IBOutlet", "__attribute__((iboutlet))"); 382 Builder.defineMacro("IBOutletCollection(ClassName)", 383 "__attribute__((iboutletcollection(ClassName)))"); 384 Builder.defineMacro("IBAction", "void)__attribute__((ibaction)"); 385 } 386 387 // darwin_constant_cfstrings controls this. This is also dependent 388 // on other things like the runtime I believe. This is set even for C code. 389 if (!LangOpts.NoConstantCFStrings) 390 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 391 392 if (LangOpts.ObjC2) 393 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 394 395 if (LangOpts.PascalStrings) 396 Builder.defineMacro("__PASCAL_STRINGS__"); 397 398 if (LangOpts.Blocks) { 399 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 400 Builder.defineMacro("__BLOCKS__"); 401 } 402 403 if (LangOpts.CXXExceptions) 404 Builder.defineMacro("__EXCEPTIONS"); 405 if (LangOpts.RTTI) 406 Builder.defineMacro("__GXX_RTTI"); 407 if (LangOpts.SjLjExceptions) 408 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 409 410 if (LangOpts.Deprecated) 411 Builder.defineMacro("__DEPRECATED"); 412 413 if (LangOpts.CPlusPlus) { 414 Builder.defineMacro("__GNUG__", "4"); 415 Builder.defineMacro("__GXX_WEAK__"); 416 Builder.defineMacro("__private_extern__", "extern"); 417 } 418 419 if (LangOpts.MicrosoftExt) { 420 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 421 // VC++ appears to only like __FUNCTION__. 422 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 423 // Work around some issues with Visual C++ headers. 424 if (LangOpts.WChar) { 425 // wchar_t supported as a keyword. 426 Builder.defineMacro("_WCHAR_T_DEFINED"); 427 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 428 } 429 if (LangOpts.CPlusPlus) { 430 // FIXME: Support Microsoft's __identifier extension in the lexer. 431 Builder.append("#define __identifier(x) x"); 432 Builder.append("class type_info;"); 433 } 434 } 435 436 if (LangOpts.Optimize) 437 Builder.defineMacro("__OPTIMIZE__"); 438 if (LangOpts.OptimizeSize) 439 Builder.defineMacro("__OPTIMIZE_SIZE__"); 440 441 if (LangOpts.FastMath) 442 Builder.defineMacro("__FAST_MATH__"); 443 444 // Initialize target-specific preprocessor defines. 445 446 // __BYTE_ORDER__ was added in GCC 4.6. It's analogous 447 // to the macro __BYTE_ORDER (no trailing underscores) 448 // from glibc's <endian.h> header. 449 // We don't support the PDP-11 as a target, but include 450 // the define so it can still be compared against. 451 Builder.defineMacro("__ORDER_LITTLE_ENDIAN__", "1234"); 452 Builder.defineMacro("__ORDER_BIG_ENDIAN__", "4321"); 453 Builder.defineMacro("__ORDER_PDP_ENDIAN__", "3412"); 454 if (TI.isBigEndian()) 455 Builder.defineMacro("__BYTE_ORDER__", "__ORDER_BIG_ENDIAN__"); 456 else 457 Builder.defineMacro("__BYTE_ORDER__", "__ORDER_LITTLE_ENDIAN__"); 458 459 460 if (TI.getPointerWidth(0) == 64 && TI.getLongWidth() == 64 461 && TI.getIntWidth() == 32) { 462 Builder.defineMacro("_LP64"); 463 Builder.defineMacro("__LP64__"); 464 } 465 466 // Define type sizing macros based on the target properties. 467 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 468 Builder.defineMacro("__CHAR_BIT__", "8"); 469 470 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 471 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 472 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 473 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 474 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 475 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 476 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 477 478 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 479 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 480 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 481 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 482 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 483 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 484 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 485 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 486 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 487 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 488 DefineTypeSizeof("__SIZEOF_SIZE_T__", 489 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 490 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 491 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 492 DefineTypeSizeof("__SIZEOF_WINT_T__", 493 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 494 495 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 496 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 497 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 498 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 499 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 500 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 501 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 502 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 503 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 504 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 505 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 506 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 507 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 508 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 509 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 510 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 511 512 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); 513 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); 514 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); 515 516 // Define a __POINTER_WIDTH__ macro for stdint.h. 517 Builder.defineMacro("__POINTER_WIDTH__", 518 Twine((int)TI.getPointerWidth(0))); 519 520 if (!LangOpts.CharIsSigned) 521 Builder.defineMacro("__CHAR_UNSIGNED__"); 522 523 if (!TargetInfo::isTypeSigned(TI.getWCharType())) 524 Builder.defineMacro("__WCHAR_UNSIGNED__"); 525 526 if (!TargetInfo::isTypeSigned(TI.getWIntType())) 527 Builder.defineMacro("__WINT_UNSIGNED__"); 528 529 // Define exact-width integer types for stdint.h 530 Builder.defineMacro("__INT" + Twine(TI.getCharWidth()) + "_TYPE__", 531 "char"); 532 533 if (TI.getShortWidth() > TI.getCharWidth()) 534 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 535 536 if (TI.getIntWidth() > TI.getShortWidth()) 537 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 538 539 if (TI.getLongWidth() > TI.getIntWidth()) 540 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 541 542 if (TI.getLongLongWidth() > TI.getLongWidth()) 543 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 544 545 if (const char *Prefix = TI.getUserLabelPrefix()) 546 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 547 548 if (LangOpts.FastMath || LangOpts.FiniteMathOnly) 549 Builder.defineMacro("__FINITE_MATH_ONLY__", "1"); 550 else 551 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 552 553 if (LangOpts.GNUInline) 554 Builder.defineMacro("__GNUC_GNU_INLINE__"); 555 else 556 Builder.defineMacro("__GNUC_STDC_INLINE__"); 557 558 // The value written by __atomic_test_and_set. 559 // FIXME: This is target-dependent. 560 Builder.defineMacro("__GCC_ATOMIC_TEST_AND_SET_TRUEVAL", "1"); 561 562 // Used by libstdc++ to implement ATOMIC_<foo>_LOCK_FREE. 563 unsigned InlineWidthBits = TI.getMaxAtomicInlineWidth(); 564#define DEFINE_LOCK_FREE_MACRO(TYPE, Type) \ 565 Builder.defineMacro("__GCC_ATOMIC_" #TYPE "_LOCK_FREE", \ 566 getLockFreeValue(TI.get##Type##Width(), \ 567 TI.get##Type##Align(), \ 568 InlineWidthBits)); 569 DEFINE_LOCK_FREE_MACRO(BOOL, Bool); 570 DEFINE_LOCK_FREE_MACRO(CHAR, Char); 571 DEFINE_LOCK_FREE_MACRO(CHAR16_T, Char16); 572 DEFINE_LOCK_FREE_MACRO(CHAR32_T, Char32); 573 DEFINE_LOCK_FREE_MACRO(WCHAR_T, WChar); 574 DEFINE_LOCK_FREE_MACRO(SHORT, Short); 575 DEFINE_LOCK_FREE_MACRO(INT, Int); 576 DEFINE_LOCK_FREE_MACRO(LONG, Long); 577 DEFINE_LOCK_FREE_MACRO(LLONG, LongLong); 578 Builder.defineMacro("__GCC_ATOMIC_POINTER_LOCK_FREE", 579 getLockFreeValue(TI.getPointerWidth(0), 580 TI.getPointerAlign(0), 581 InlineWidthBits)); 582#undef DEFINE_LOCK_FREE_MACRO 583 584 if (LangOpts.NoInlineDefine) 585 Builder.defineMacro("__NO_INLINE__"); 586 587 if (unsigned PICLevel = LangOpts.PICLevel) { 588 Builder.defineMacro("__PIC__", Twine(PICLevel)); 589 Builder.defineMacro("__pic__", Twine(PICLevel)); 590 } 591 if (unsigned PIELevel = LangOpts.PIELevel) { 592 Builder.defineMacro("__PIE__", Twine(PIELevel)); 593 Builder.defineMacro("__pie__", Twine(PIELevel)); 594 } 595 596 // Macros to control C99 numerics and <float.h> 597 Builder.defineMacro("__FLT_EVAL_METHOD__", Twine(TI.getFloatEvalMethod())); 598 Builder.defineMacro("__FLT_RADIX__", "2"); 599 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 600 Builder.defineMacro("__DECIMAL_DIG__", Twine(Dig)); 601 602 if (LangOpts.getStackProtector() == LangOptions::SSPOn) 603 Builder.defineMacro("__SSP__"); 604 else if (LangOpts.getStackProtector() == LangOptions::SSPReq) 605 Builder.defineMacro("__SSP_ALL__", "2"); 606 607 if (FEOpts.ProgramAction == frontend::RewriteObjC) 608 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 609 610 // Define a macro that exists only when using the static analyzer. 611 if (FEOpts.ProgramAction == frontend::RunAnalysis) 612 Builder.defineMacro("__clang_analyzer__"); 613 614 if (LangOpts.FastRelaxedMath) 615 Builder.defineMacro("__FAST_RELAXED_MATH__"); 616 617 if (LangOpts.ObjCAutoRefCount) { 618 Builder.defineMacro("__weak", "__attribute__((objc_ownership(weak)))"); 619 Builder.defineMacro("__strong", "__attribute__((objc_ownership(strong)))"); 620 Builder.defineMacro("__autoreleasing", 621 "__attribute__((objc_ownership(autoreleasing)))"); 622 Builder.defineMacro("__unsafe_unretained", 623 "__attribute__((objc_ownership(none)))"); 624 } 625 626 // Get other target #defines. 627 TI.getTargetDefines(LangOpts, Builder); 628} 629 630// Initialize the remapping of files to alternative contents, e.g., 631// those specified through other files. 632static void InitializeFileRemapping(DiagnosticsEngine &Diags, 633 SourceManager &SourceMgr, 634 FileManager &FileMgr, 635 const PreprocessorOptions &InitOpts) { 636 // Remap files in the source manager (with buffers). 637 for (PreprocessorOptions::const_remapped_file_buffer_iterator 638 Remap = InitOpts.remapped_file_buffer_begin(), 639 RemapEnd = InitOpts.remapped_file_buffer_end(); 640 Remap != RemapEnd; 641 ++Remap) { 642 // Create the file entry for the file that we're mapping from. 643 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 644 Remap->second->getBufferSize(), 645 0); 646 if (!FromFile) { 647 Diags.Report(diag::err_fe_remap_missing_from_file) 648 << Remap->first; 649 if (!InitOpts.RetainRemappedFileBuffers) 650 delete Remap->second; 651 continue; 652 } 653 654 // Override the contents of the "from" file with the contents of 655 // the "to" file. 656 SourceMgr.overrideFileContents(FromFile, Remap->second, 657 InitOpts.RetainRemappedFileBuffers); 658 } 659 660 // Remap files in the source manager (with other files). 661 for (PreprocessorOptions::const_remapped_file_iterator 662 Remap = InitOpts.remapped_file_begin(), 663 RemapEnd = InitOpts.remapped_file_end(); 664 Remap != RemapEnd; 665 ++Remap) { 666 // Find the file that we're mapping to. 667 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 668 if (!ToFile) { 669 Diags.Report(diag::err_fe_remap_missing_to_file) 670 << Remap->first << Remap->second; 671 continue; 672 } 673 674 // Create the file entry for the file that we're mapping from. 675 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 676 ToFile->getSize(), 0); 677 if (!FromFile) { 678 Diags.Report(diag::err_fe_remap_missing_from_file) 679 << Remap->first; 680 continue; 681 } 682 683 // Override the contents of the "from" file with the contents of 684 // the "to" file. 685 SourceMgr.overrideFileContents(FromFile, ToFile); 686 } 687 688 SourceMgr.setOverridenFilesKeepOriginalName( 689 InitOpts.RemappedFilesKeepOriginalName); 690} 691 692/// InitializePreprocessor - Initialize the preprocessor getting it and the 693/// environment ready to process a single file. This returns true on error. 694/// 695void clang::InitializePreprocessor(Preprocessor &PP, 696 const PreprocessorOptions &InitOpts, 697 const HeaderSearchOptions &HSOpts, 698 const FrontendOptions &FEOpts) { 699 const LangOptions &LangOpts = PP.getLangOpts(); 700 std::string PredefineBuffer; 701 PredefineBuffer.reserve(4080); 702 llvm::raw_string_ostream Predefines(PredefineBuffer); 703 MacroBuilder Builder(Predefines); 704 705 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 706 PP.getFileManager(), InitOpts); 707 708 // Emit line markers for various builtin sections of the file. We don't do 709 // this in asm preprocessor mode, because "# 4" is not a line marker directive 710 // in this mode. 711 if (!PP.getLangOpts().AsmPreprocessor) 712 Builder.append("# 1 \"<built-in>\" 3"); 713 714 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 715 if (InitOpts.UsePredefines) { 716 InitializePredefinedMacros(PP.getTargetInfo(), LangOpts, FEOpts, Builder); 717 718 // Install definitions to make Objective-C++ ARC work well with various 719 // C++ Standard Library implementations. 720 if (LangOpts.ObjC1 && LangOpts.CPlusPlus && LangOpts.ObjCAutoRefCount) { 721 switch (InitOpts.ObjCXXARCStandardLibrary) { 722 case ARCXX_nolib: 723 case ARCXX_libcxx: 724 break; 725 726 case ARCXX_libstdcxx: 727 AddObjCXXARCLibstdcxxDefines(LangOpts, Builder); 728 break; 729 } 730 } 731 } 732 733 // Even with predefines off, some macros are still predefined. 734 // These should all be defined in the preprocessor according to the 735 // current language configuration. 736 InitializeStandardPredefinedMacros(PP.getTargetInfo(), PP.getLangOpts(), 737 FEOpts, Builder); 738 739 // Add on the predefines from the driver. Wrap in a #line directive to report 740 // that they come from the command line. 741 if (!PP.getLangOpts().AsmPreprocessor) 742 Builder.append("# 1 \"<command line>\" 1"); 743 744 // Process #define's and #undef's in the order they are given. 745 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 746 if (InitOpts.Macros[i].second) // isUndef 747 Builder.undefineMacro(InitOpts.Macros[i].first); 748 else 749 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 750 PP.getDiagnostics()); 751 } 752 753 // If -imacros are specified, include them now. These are processed before 754 // any -include directives. 755 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 756 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i], 757 PP.getFileManager()); 758 759 // Process -include directives. 760 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 761 const std::string &Path = InitOpts.Includes[i]; 762 if (Path == InitOpts.ImplicitPTHInclude) 763 AddImplicitIncludePTH(Builder, PP, Path); 764 else 765 AddImplicitInclude(Builder, Path, PP.getFileManager()); 766 } 767 768 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 769 if (!PP.getLangOpts().AsmPreprocessor) 770 Builder.append("# 1 \"<built-in>\" 2"); 771 772 // Instruct the preprocessor to skip the preamble. 773 PP.setSkipMainFilePreamble(InitOpts.PrecompiledPreambleBytes.first, 774 InitOpts.PrecompiledPreambleBytes.second); 775 776 // Copy PredefinedBuffer into the Preprocessor. 777 PP.setPredefines(Predefines.str()); 778 779 // Initialize the header search object. 780 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 781 PP.getLangOpts(), 782 PP.getTargetInfo().getTriple()); 783} 784