InitPreprocessor.cpp revision 210299
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/Preprocessor.h" 22#include "clang/Basic/FileManager.h" 23#include "clang/Basic/SourceManager.h" 24#include "llvm/ADT/APFloat.h" 25#include "llvm/Support/MemoryBuffer.h" 26#include "llvm/System/Path.h" 27using namespace clang; 28 29// Append a #define line to Buf for Macro. Macro should be of the form XXX, 30// in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit 31// "#define XXX Y z W". To get a #define with no value, use "XXX=". 32static void DefineBuiltinMacro(MacroBuilder &Builder, llvm::StringRef Macro, 33 Diagnostic &Diags) { 34 std::pair<llvm::StringRef, llvm::StringRef> MacroPair = Macro.split('='); 35 llvm::StringRef MacroName = MacroPair.first; 36 llvm::StringRef MacroBody = MacroPair.second; 37 if (MacroName.size() != Macro.size()) { 38 // Per GCC -D semantics, the macro ends at \n if it exists. 39 llvm::StringRef::size_type End = MacroBody.find_first_of("\n\r"); 40 if (End != llvm::StringRef::npos) 41 Diags.Report(diag::warn_fe_macro_contains_embedded_newline) 42 << MacroName; 43 Builder.defineMacro(MacroName, MacroBody.substr(0, End)); 44 } else { 45 // Push "macroname 1". 46 Builder.defineMacro(Macro); 47 } 48} 49 50std::string clang::NormalizeDashIncludePath(llvm::StringRef File) { 51 // Implicit include paths should be resolved relative to the current 52 // working directory first, and then use the regular header search 53 // mechanism. The proper way to handle this is to have the 54 // predefines buffer located at the current working directory, but 55 // it has not file entry. For now, workaround this by using an 56 // absolute path if we find the file here, and otherwise letting 57 // header search handle it. 58 llvm::sys::Path Path(File); 59 Path.makeAbsolute(); 60 if (!Path.exists()) 61 Path = File; 62 63 return Lexer::Stringify(Path.str()); 64} 65 66/// AddImplicitInclude - Add an implicit #include of the specified file to the 67/// predefines buffer. 68static void AddImplicitInclude(MacroBuilder &Builder, llvm::StringRef File) { 69 Builder.append("#include \"" + 70 llvm::Twine(NormalizeDashIncludePath(File)) + "\""); 71} 72 73static void AddImplicitIncludeMacros(MacroBuilder &Builder, 74 llvm::StringRef File) { 75 Builder.append("#__include_macros \"" + 76 llvm::Twine(NormalizeDashIncludePath(File)) + "\""); 77 // Marker token to stop the __include_macros fetch loop. 78 Builder.append("##"); // ##? 79} 80 81/// AddImplicitIncludePTH - Add an implicit #include using the original file 82/// used to generate a PTH cache. 83static void AddImplicitIncludePTH(MacroBuilder &Builder, Preprocessor &PP, 84 llvm::StringRef ImplicitIncludePTH) { 85 PTHManager *P = PP.getPTHManager(); 86 // Null check 'P' in the corner case where it couldn't be created. 87 const char *OriginalFile = P ? P->getOriginalSourceFile() : 0; 88 89 if (!OriginalFile) { 90 PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header) 91 << ImplicitIncludePTH; 92 return; 93 } 94 95 AddImplicitInclude(Builder, OriginalFile); 96} 97 98/// PickFP - This is used to pick a value based on the FP semantics of the 99/// specified FP model. 100template <typename T> 101static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, 102 T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal, 103 T IEEEQuadVal) { 104 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle) 105 return IEEESingleVal; 106 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble) 107 return IEEEDoubleVal; 108 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended) 109 return X87DoubleExtendedVal; 110 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble) 111 return PPCDoubleDoubleVal; 112 assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad); 113 return IEEEQuadVal; 114} 115 116static void DefineFloatMacros(MacroBuilder &Builder, llvm::StringRef Prefix, 117 const llvm::fltSemantics *Sem) { 118 const char *DenormMin, *Epsilon, *Max, *Min; 119 DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324", 120 "3.64519953188247460253e-4951L", 121 "4.94065645841246544176568792868221e-324L", 122 "6.47517511943802511092443895822764655e-4966L"); 123 int Digits = PickFP(Sem, 6, 15, 18, 31, 33); 124 Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16", 125 "1.08420217248550443401e-19L", 126 "4.94065645841246544176568792868221e-324L", 127 "1.92592994438723585305597794258492732e-34L"); 128 int MantissaDigits = PickFP(Sem, 24, 53, 64, 106, 113); 129 int Min10Exp = PickFP(Sem, -37, -307, -4931, -291, -4931); 130 int Max10Exp = PickFP(Sem, 38, 308, 4932, 308, 4932); 131 int MinExp = PickFP(Sem, -125, -1021, -16381, -968, -16381); 132 int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024, 16384); 133 Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308", 134 "3.36210314311209350626e-4932L", 135 "2.00416836000897277799610805135016e-292L", 136 "3.36210314311209350626267781732175260e-4932L"); 137 Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308", 138 "1.18973149535723176502e+4932L", 139 "1.79769313486231580793728971405301e+308L", 140 "1.18973149535723176508575932662800702e+4932L"); 141 142 llvm::SmallString<32> DefPrefix; 143 DefPrefix = "__"; 144 DefPrefix += Prefix; 145 DefPrefix += "_"; 146 147 Builder.defineMacro(DefPrefix + "DENORM_MIN__", DenormMin); 148 Builder.defineMacro(DefPrefix + "HAS_DENORM__"); 149 Builder.defineMacro(DefPrefix + "DIG__", llvm::Twine(Digits)); 150 Builder.defineMacro(DefPrefix + "EPSILON__", llvm::Twine(Epsilon)); 151 Builder.defineMacro(DefPrefix + "HAS_INFINITY__"); 152 Builder.defineMacro(DefPrefix + "HAS_QUIET_NAN__"); 153 Builder.defineMacro(DefPrefix + "MANT_DIG__", llvm::Twine(MantissaDigits)); 154 155 Builder.defineMacro(DefPrefix + "MAX_10_EXP__", llvm::Twine(Max10Exp)); 156 Builder.defineMacro(DefPrefix + "MAX_EXP__", llvm::Twine(MaxExp)); 157 Builder.defineMacro(DefPrefix + "MAX__", llvm::Twine(Max)); 158 159 Builder.defineMacro(DefPrefix + "MIN_10_EXP__","("+llvm::Twine(Min10Exp)+")"); 160 Builder.defineMacro(DefPrefix + "MIN_EXP__", "("+llvm::Twine(MinExp)+")"); 161 Builder.defineMacro(DefPrefix + "MIN__", llvm::Twine(Min)); 162} 163 164 165/// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro 166/// named MacroName with the max value for a type with width 'TypeWidth' a 167/// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL). 168static void DefineTypeSize(llvm::StringRef MacroName, unsigned TypeWidth, 169 llvm::StringRef ValSuffix, bool isSigned, 170 MacroBuilder& Builder) { 171 long long MaxVal; 172 if (isSigned) 173 MaxVal = (1LL << (TypeWidth - 1)) - 1; 174 else 175 MaxVal = ~0LL >> (64-TypeWidth); 176 177 Builder.defineMacro(MacroName, llvm::Twine(MaxVal) + ValSuffix); 178} 179 180/// DefineTypeSize - An overloaded helper that uses TargetInfo to determine 181/// the width, suffix, and signedness of the given type 182static void DefineTypeSize(llvm::StringRef MacroName, TargetInfo::IntType Ty, 183 const TargetInfo &TI, MacroBuilder &Builder) { 184 DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty), 185 TI.isTypeSigned(Ty), Builder); 186} 187 188static void DefineType(const llvm::Twine &MacroName, TargetInfo::IntType Ty, 189 MacroBuilder &Builder) { 190 Builder.defineMacro(MacroName, TargetInfo::getTypeName(Ty)); 191} 192 193static void DefineTypeWidth(llvm::StringRef MacroName, TargetInfo::IntType Ty, 194 const TargetInfo &TI, MacroBuilder &Builder) { 195 Builder.defineMacro(MacroName, llvm::Twine(TI.getTypeWidth(Ty))); 196} 197 198static void DefineTypeSizeof(llvm::StringRef MacroName, unsigned BitWidth, 199 const TargetInfo &TI, MacroBuilder &Builder) { 200 Builder.defineMacro(MacroName, 201 llvm::Twine(BitWidth / TI.getCharWidth())); 202} 203 204static void DefineExactWidthIntType(TargetInfo::IntType Ty, 205 const TargetInfo &TI, MacroBuilder &Builder) { 206 int TypeWidth = TI.getTypeWidth(Ty); 207 208 // Use the target specified int64 type, when appropriate, so that [u]int64_t 209 // ends up being defined in terms of the correct type. 210 if (TypeWidth == 64) 211 Ty = TI.getInt64Type(); 212 213 DefineType("__INT" + llvm::Twine(TypeWidth) + "_TYPE__", Ty, Builder); 214 215 llvm::StringRef ConstSuffix(TargetInfo::getTypeConstantSuffix(Ty)); 216 if (!ConstSuffix.empty()) 217 Builder.defineMacro("__INT" + llvm::Twine(TypeWidth) + "_C_SUFFIX__", 218 ConstSuffix); 219} 220 221static void InitializePredefinedMacros(const TargetInfo &TI, 222 const LangOptions &LangOpts, 223 const FrontendOptions &FEOpts, 224 MacroBuilder &Builder) { 225 // Compiler version introspection macros. 226 Builder.defineMacro("__llvm__"); // LLVM Backend 227 Builder.defineMacro("__clang__"); // Clang Frontend 228#define TOSTR2(X) #X 229#define TOSTR(X) TOSTR2(X) 230 Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR)); 231 Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR)); 232#ifdef CLANG_VERSION_PATCHLEVEL 233 Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL)); 234#else 235 Builder.defineMacro("__clang_patchlevel__", "0"); 236#endif 237 Builder.defineMacro("__clang_version__", 238 "\"" CLANG_VERSION_STRING " (" 239 + getClangFullRepositoryVersion() + ")\""); 240#undef TOSTR 241#undef TOSTR2 242 // Currently claim to be compatible with GCC 4.2.1-5621. 243 Builder.defineMacro("__GNUC_MINOR__", "2"); 244 Builder.defineMacro("__GNUC_PATCHLEVEL__", "1"); 245 Builder.defineMacro("__GNUC__", "4"); 246 Builder.defineMacro("__GXX_ABI_VERSION", "1002"); 247 Builder.defineMacro("__VERSION__", "\"4.2.1 Compatible Clang Compiler\""); 248 249 // Initialize language-specific preprocessor defines. 250 251 // These should all be defined in the preprocessor according to the 252 // current language configuration. 253 if (!LangOpts.Microsoft) 254 Builder.defineMacro("__STDC__"); 255 if (LangOpts.AsmPreprocessor) 256 Builder.defineMacro("__ASSEMBLER__"); 257 258 if (!LangOpts.CPlusPlus) { 259 if (LangOpts.C99) 260 Builder.defineMacro("__STDC_VERSION__", "199901L"); 261 else if (!LangOpts.GNUMode && LangOpts.Digraphs) 262 Builder.defineMacro("__STDC_VERSION__", "199409L"); 263 } 264 265 // Standard conforming mode? 266 if (!LangOpts.GNUMode) 267 Builder.defineMacro("__STRICT_ANSI__"); 268 269 if (LangOpts.CPlusPlus0x) 270 Builder.defineMacro("__GXX_EXPERIMENTAL_CXX0X__"); 271 272 if (LangOpts.Freestanding) 273 Builder.defineMacro("__STDC_HOSTED__", "0"); 274 else 275 Builder.defineMacro("__STDC_HOSTED__"); 276 277 if (LangOpts.ObjC1) { 278 Builder.defineMacro("__OBJC__"); 279 if (LangOpts.ObjCNonFragileABI) { 280 Builder.defineMacro("__OBJC2__"); 281 Builder.defineMacro("OBJC_ZEROCOST_EXCEPTIONS"); 282 } 283 284 if (LangOpts.getGCMode() != LangOptions::NonGC) 285 Builder.defineMacro("__OBJC_GC__"); 286 287 if (LangOpts.NeXTRuntime) 288 Builder.defineMacro("__NEXT_RUNTIME__"); 289 } 290 291 // darwin_constant_cfstrings controls this. This is also dependent 292 // on other things like the runtime I believe. This is set even for C code. 293 Builder.defineMacro("__CONSTANT_CFSTRINGS__"); 294 295 if (LangOpts.ObjC2) 296 Builder.defineMacro("OBJC_NEW_PROPERTIES"); 297 298 if (LangOpts.PascalStrings) 299 Builder.defineMacro("__PASCAL_STRINGS__"); 300 301 if (LangOpts.Blocks) { 302 Builder.defineMacro("__block", "__attribute__((__blocks__(byref)))"); 303 Builder.defineMacro("__BLOCKS__"); 304 } 305 306 if (LangOpts.Exceptions) 307 Builder.defineMacro("__EXCEPTIONS"); 308 if (LangOpts.RTTI) 309 Builder.defineMacro("__GXX_RTTI"); 310 if (LangOpts.SjLjExceptions) 311 Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__"); 312 313 if (LangOpts.CPlusPlus) { 314 Builder.defineMacro("__DEPRECATED"); 315 Builder.defineMacro("__GNUG__", "4"); 316 Builder.defineMacro("__GXX_WEAK__"); 317 if (LangOpts.GNUMode) 318 Builder.defineMacro("__cplusplus"); 319 else 320 // C++ [cpp.predefined]p1: 321 // The name_ _cplusplusis defined to the value199711Lwhen compiling a 322 // C++ translation unit. 323 Builder.defineMacro("__cplusplus", "199711L"); 324 Builder.defineMacro("__private_extern__", "extern"); 325 } 326 327 if (LangOpts.Microsoft) { 328 // Filter out some microsoft extensions when trying to parse in ms-compat 329 // mode. 330 Builder.defineMacro("__int8", "__INT8_TYPE__"); 331 Builder.defineMacro("__int16", "__INT16_TYPE__"); 332 Builder.defineMacro("__int32", "__INT32_TYPE__"); 333 Builder.defineMacro("__int64", "__INT64_TYPE__"); 334 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 335 // VC++ appears to only like __FUNCTION__. 336 Builder.defineMacro("__PRETTY_FUNCTION__", "__FUNCTION__"); 337 // Work around some issues with Visual C++ headerws. 338 if (LangOpts.CPlusPlus) { 339 // Since we define wchar_t in C++ mode. 340 Builder.defineMacro("_WCHAR_T_DEFINED"); 341 Builder.defineMacro("_NATIVE_WCHAR_T_DEFINED"); 342 // FIXME: This should be temporary until we have a __pragma 343 // solution, to avoid some errors flagged in VC++ headers. 344 Builder.defineMacro("_CRT_SECURE_CPP_OVERLOAD_SECURE_NAMES", "0"); 345 } 346 } 347 348 if (LangOpts.Optimize) 349 Builder.defineMacro("__OPTIMIZE__"); 350 if (LangOpts.OptimizeSize) 351 Builder.defineMacro("__OPTIMIZE_SIZE__"); 352 353 // Initialize target-specific preprocessor defines. 354 355 // Define type sizing macros based on the target properties. 356 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 357 Builder.defineMacro("__CHAR_BIT__", "8"); 358 359 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Builder); 360 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Builder); 361 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Builder); 362 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Builder); 363 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Builder); 364 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Builder); 365 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Builder); 366 367 DefineTypeSizeof("__SIZEOF_DOUBLE__", TI.getDoubleWidth(), TI, Builder); 368 DefineTypeSizeof("__SIZEOF_FLOAT__", TI.getFloatWidth(), TI, Builder); 369 DefineTypeSizeof("__SIZEOF_INT__", TI.getIntWidth(), TI, Builder); 370 DefineTypeSizeof("__SIZEOF_LONG__", TI.getLongWidth(), TI, Builder); 371 DefineTypeSizeof("__SIZEOF_LONG_DOUBLE__",TI.getLongDoubleWidth(),TI,Builder); 372 DefineTypeSizeof("__SIZEOF_LONG_LONG__", TI.getLongLongWidth(), TI, Builder); 373 DefineTypeSizeof("__SIZEOF_POINTER__", TI.getPointerWidth(0), TI, Builder); 374 DefineTypeSizeof("__SIZEOF_SHORT__", TI.getShortWidth(), TI, Builder); 375 DefineTypeSizeof("__SIZEOF_PTRDIFF_T__", 376 TI.getTypeWidth(TI.getPtrDiffType(0)), TI, Builder); 377 DefineTypeSizeof("__SIZEOF_SIZE_T__", 378 TI.getTypeWidth(TI.getSizeType()), TI, Builder); 379 DefineTypeSizeof("__SIZEOF_WCHAR_T__", 380 TI.getTypeWidth(TI.getWCharType()), TI, Builder); 381 DefineTypeSizeof("__SIZEOF_WINT_T__", 382 TI.getTypeWidth(TI.getWIntType()), TI, Builder); 383 384 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Builder); 385 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Builder); 386 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Builder); 387 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Builder); 388 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Builder); 389 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Builder); 390 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Builder); 391 DefineType("__SIZE_TYPE__", TI.getSizeType(), Builder); 392 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Builder); 393 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder); 394 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Builder); 395 DefineType("__WINT_TYPE__", TI.getWIntType(), Builder); 396 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Builder); 397 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Builder); 398 DefineType("__CHAR16_TYPE__", TI.getChar16Type(), Builder); 399 DefineType("__CHAR32_TYPE__", TI.getChar32Type(), Builder); 400 401 DefineFloatMacros(Builder, "FLT", &TI.getFloatFormat()); 402 DefineFloatMacros(Builder, "DBL", &TI.getDoubleFormat()); 403 DefineFloatMacros(Builder, "LDBL", &TI.getLongDoubleFormat()); 404 405 // Define a __POINTER_WIDTH__ macro for stdint.h. 406 Builder.defineMacro("__POINTER_WIDTH__", 407 llvm::Twine((int)TI.getPointerWidth(0))); 408 409 if (!LangOpts.CharIsSigned) 410 Builder.defineMacro("__CHAR_UNSIGNED__"); 411 412 // Define exact-width integer types for stdint.h 413 Builder.defineMacro("__INT" + llvm::Twine(TI.getCharWidth()) + "_TYPE__", 414 "char"); 415 416 if (TI.getShortWidth() > TI.getCharWidth()) 417 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Builder); 418 419 if (TI.getIntWidth() > TI.getShortWidth()) 420 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Builder); 421 422 if (TI.getLongWidth() > TI.getIntWidth()) 423 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Builder); 424 425 if (TI.getLongLongWidth() > TI.getLongWidth()) 426 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Builder); 427 428 // Add __builtin_va_list typedef. 429 Builder.append(TI.getVAListDeclaration()); 430 431 if (const char *Prefix = TI.getUserLabelPrefix()) 432 Builder.defineMacro("__USER_LABEL_PREFIX__", Prefix); 433 434 // Build configuration options. FIXME: these should be controlled by 435 // command line options or something. 436 Builder.defineMacro("__FINITE_MATH_ONLY__", "0"); 437 438 if (LangOpts.GNUInline) 439 Builder.defineMacro("__GNUC_GNU_INLINE__"); 440 else 441 Builder.defineMacro("__GNUC_STDC_INLINE__"); 442 443 if (LangOpts.NoInline) 444 Builder.defineMacro("__NO_INLINE__"); 445 446 if (unsigned PICLevel = LangOpts.PICLevel) { 447 Builder.defineMacro("__PIC__", llvm::Twine(PICLevel)); 448 Builder.defineMacro("__pic__", llvm::Twine(PICLevel)); 449 } 450 451 // Macros to control C99 numerics and <float.h> 452 Builder.defineMacro("__FLT_EVAL_METHOD__", "0"); 453 Builder.defineMacro("__FLT_RADIX__", "2"); 454 int Dig = PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36); 455 Builder.defineMacro("__DECIMAL_DIG__", llvm::Twine(Dig)); 456 457 if (LangOpts.getStackProtectorMode() == LangOptions::SSPOn) 458 Builder.defineMacro("__SSP__"); 459 else if (LangOpts.getStackProtectorMode() == LangOptions::SSPReq) 460 Builder.defineMacro("__SSP_ALL__", "2"); 461 462 if (FEOpts.ProgramAction == frontend::RewriteObjC) 463 Builder.defineMacro("__weak", "__attribute__((objc_gc(weak)))"); 464 465 // Define a macro that exists only when using the static analyzer. 466 if (FEOpts.ProgramAction == frontend::RunAnalysis) 467 Builder.defineMacro("__clang_analyzer__"); 468 469 // Get other target #defines. 470 TI.getTargetDefines(LangOpts, Builder); 471} 472 473// Initialize the remapping of files to alternative contents, e.g., 474// those specified through other files. 475static void InitializeFileRemapping(Diagnostic &Diags, 476 SourceManager &SourceMgr, 477 FileManager &FileMgr, 478 const PreprocessorOptions &InitOpts) { 479 // Remap files in the source manager (with buffers). 480 for (PreprocessorOptions::remapped_file_buffer_iterator 481 Remap = InitOpts.remapped_file_buffer_begin(), 482 RemapEnd = InitOpts.remapped_file_buffer_end(); 483 Remap != RemapEnd; 484 ++Remap) { 485 // Create the file entry for the file that we're mapping from. 486 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 487 Remap->second->getBufferSize(), 488 0); 489 if (!FromFile) { 490 Diags.Report(diag::err_fe_remap_missing_from_file) 491 << Remap->first; 492 delete Remap->second; 493 continue; 494 } 495 496 // Override the contents of the "from" file with the contents of 497 // the "to" file. 498 SourceMgr.overrideFileContents(FromFile, Remap->second); 499 } 500 501 // Remap files in the source manager (with other files). 502 for (PreprocessorOptions::remapped_file_iterator 503 Remap = InitOpts.remapped_file_begin(), 504 RemapEnd = InitOpts.remapped_file_end(); 505 Remap != RemapEnd; 506 ++Remap) { 507 // Find the file that we're mapping to. 508 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 509 if (!ToFile) { 510 Diags.Report(diag::err_fe_remap_missing_to_file) 511 << Remap->first << Remap->second; 512 continue; 513 } 514 515 // Create the file entry for the file that we're mapping from. 516 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 517 ToFile->getSize(), 518 0); 519 if (!FromFile) { 520 Diags.Report(diag::err_fe_remap_missing_from_file) 521 << Remap->first; 522 continue; 523 } 524 525 // Load the contents of the file we're mapping to. 526 std::string ErrorStr; 527 const llvm::MemoryBuffer *Buffer 528 = llvm::MemoryBuffer::getFile(ToFile->getName(), &ErrorStr); 529 if (!Buffer) { 530 Diags.Report(diag::err_fe_error_opening) 531 << Remap->second << ErrorStr; 532 continue; 533 } 534 535 // Override the contents of the "from" file with the contents of 536 // the "to" file. 537 SourceMgr.overrideFileContents(FromFile, Buffer); 538 } 539} 540 541/// InitializePreprocessor - Initialize the preprocessor getting it and the 542/// environment ready to process a single file. This returns true on error. 543/// 544void clang::InitializePreprocessor(Preprocessor &PP, 545 const PreprocessorOptions &InitOpts, 546 const HeaderSearchOptions &HSOpts, 547 const FrontendOptions &FEOpts) { 548 std::string PredefineBuffer; 549 PredefineBuffer.reserve(4080); 550 llvm::raw_string_ostream Predefines(PredefineBuffer); 551 MacroBuilder Builder(Predefines); 552 553 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 554 PP.getFileManager(), InitOpts); 555 556 // Emit line markers for various builtin sections of the file. We don't do 557 // this in asm preprocessor mode, because "# 4" is not a line marker directive 558 // in this mode. 559 if (!PP.getLangOptions().AsmPreprocessor) 560 Builder.append("# 1 \"<built-in>\" 3"); 561 562 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 563 if (InitOpts.UsePredefines) 564 InitializePredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(), 565 FEOpts, Builder); 566 567 // Add on the predefines from the driver. Wrap in a #line directive to report 568 // that they come from the command line. 569 if (!PP.getLangOptions().AsmPreprocessor) 570 Builder.append("# 1 \"<command line>\" 1"); 571 572 // Process #define's and #undef's in the order they are given. 573 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 574 if (InitOpts.Macros[i].second) // isUndef 575 Builder.undefineMacro(InitOpts.Macros[i].first); 576 else 577 DefineBuiltinMacro(Builder, InitOpts.Macros[i].first, 578 PP.getDiagnostics()); 579 } 580 581 // If -imacros are specified, include them now. These are processed before 582 // any -include directives. 583 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 584 AddImplicitIncludeMacros(Builder, InitOpts.MacroIncludes[i]); 585 586 // Process -include directives. 587 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 588 const std::string &Path = InitOpts.Includes[i]; 589 if (Path == InitOpts.ImplicitPTHInclude) 590 AddImplicitIncludePTH(Builder, PP, Path); 591 else 592 AddImplicitInclude(Builder, Path); 593 } 594 595 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 596 if (!PP.getLangOptions().AsmPreprocessor) 597 Builder.append("# 1 \"<built-in>\" 2"); 598 599 // Copy PredefinedBuffer into the Preprocessor. 600 PP.setPredefines(Predefines.str()); 601 602 // Initialize the header search object. 603 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 604 PP.getLangOptions(), 605 PP.getTargetInfo().getTriple()); 606} 607