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/TargetInfo.h" 16 #include "clang/Frontend/FrontendDiagnostic.h" 17 #include "clang/Frontend/PreprocessorOptions.h" 18 #include "clang/Lex/Preprocessor.h" 19 #include "clang/Basic/FileManager.h" 20 #include "clang/Basic/SourceManager.h" 21 #include "llvm/ADT/StringExtras.h" 22 #include "llvm/ADT/StringMap.h" 23 #include "llvm/ADT/STLExtras.h" 24 #include "llvm/Support/MemoryBuffer.h" 25 #include "llvm/System/Path.h" 26 using namespace clang; 27 28 // Append a #define line to Buf for Macro. Macro should be of the form XXX, 29 // in which case we emit "#define XXX 1" or "XXX=Y z W" in which case we emit 30 // "#define XXX Y z W". To get a #define with no value, use "XXX=". 31 static void DefineBuiltinMacro(std::vector<char> &Buf, const char *Macro, 32 Diagnostic *Diags = 0) { 33 const char *Command = "#define "; 34 Buf.insert(Buf.end(), Command, Command+strlen(Command)); 35 if (const char *Equal = strchr(Macro, '=')) { 36 // Turn the = into ' '. 37 Buf.insert(Buf.end(), Macro, Equal); 38 Buf.push_back(' '); 39 40 // Per GCC -D semantics, the macro ends at \n if it exists. 41 const char *End = strpbrk(Equal, "\n\r"); 42 if (End) { 43 assert(Diags && "Unexpected macro with embedded newline!"); 44 Diags->Report(diag::warn_fe_macro_contains_embedded_newline) 45 << std::string(Macro, Equal); 46 } else { 47 End = Equal+strlen(Equal); 48 } 49 50 Buf.insert(Buf.end(), Equal+1, End); 51 } else { 52 // Push "macroname 1". 53 Buf.insert(Buf.end(), Macro, Macro+strlen(Macro)); 54 Buf.push_back(' '); 55 Buf.push_back('1'); 56 } 57 Buf.push_back('\n'); 58 } 59 60 // Append a #undef line to Buf for Macro. Macro should be of the form XXX 61 // and we emit "#undef XXX". 62 static void UndefineBuiltinMacro(std::vector<char> &Buf, const char *Macro) { 63 // Push "macroname". 64 const char *Command = "#undef "; 65 Buf.insert(Buf.end(), Command, Command+strlen(Command)); 66 Buf.insert(Buf.end(), Macro, Macro+strlen(Macro)); 67 Buf.push_back('\n'); 68 } 69 70 std::string clang::NormalizeDashIncludePath(llvm::StringRef File) { 71 // Implicit include paths should be resolved relative to the current 72 // working directory first, and then use the regular header search 73 // mechanism. The proper way to handle this is to have the 74 // predefines buffer located at the current working directory, but 75 // it has not file entry. For now, workaround this by using an 76 // absolute path if we find the file here, and otherwise letting 77 // header search handle it. 78 llvm::sys::Path Path(File); 79 Path.makeAbsolute(); 80 if (!Path.exists()) 81 Path = File; 82 83 return Lexer::Stringify(Path.str()); 84 } 85 86 /// Add the quoted name of an implicit include file. 87 static void AddQuotedIncludePath(std::vector<char> &Buf, 88 const std::string &File) { 89 90 // Escape double quotes etc. 91 Buf.push_back('"'); 92 std::string EscapedFile = NormalizeDashIncludePath(File); 93 Buf.insert(Buf.end(), EscapedFile.begin(), EscapedFile.end()); 94 Buf.push_back('"'); 95 } 96 97 /// AddImplicitInclude - Add an implicit #include of the specified file to the 98 /// predefines buffer. 99 static void AddImplicitInclude(std::vector<char> &Buf, 100 const std::string &File) { 101 const char *Inc = "#include "; 102 Buf.insert(Buf.end(), Inc, Inc+strlen(Inc)); 103 AddQuotedIncludePath(Buf, File); 104 Buf.push_back('\n'); 105 } 106 107 static void AddImplicitIncludeMacros(std::vector<char> &Buf, 108 const std::string &File) { 109 const char *Inc = "#__include_macros "; 110 Buf.insert(Buf.end(), Inc, Inc+strlen(Inc)); 111 AddQuotedIncludePath(Buf, File); 112 Buf.push_back('\n'); 113 // Marker token to stop the __include_macros fetch loop. 114 const char *Marker = "##\n"; // ##? 115 Buf.insert(Buf.end(), Marker, Marker+strlen(Marker)); 116 } 117 118 /// AddImplicitIncludePTH - Add an implicit #include using the original file 119 /// used to generate a PTH cache. 120 static void AddImplicitIncludePTH(std::vector<char> &Buf, Preprocessor &PP, 121 const std::string& ImplicitIncludePTH) { 122 PTHManager *P = PP.getPTHManager(); 123 assert(P && "No PTHManager."); 124 const char *OriginalFile = P->getOriginalSourceFile(); 125 126 if (!OriginalFile) { 127 PP.getDiagnostics().Report(diag::err_fe_pth_file_has_no_source_header) 128 << ImplicitIncludePTH; 129 return; 130 } 131 132 AddImplicitInclude(Buf, OriginalFile); 133 } 134 135 /// PickFP - This is used to pick a value based on the FP semantics of the 136 /// specified FP model. 137 template <typename T> 138 static T PickFP(const llvm::fltSemantics *Sem, T IEEESingleVal, 139 T IEEEDoubleVal, T X87DoubleExtendedVal, T PPCDoubleDoubleVal, 140 T IEEEQuadVal) { 141 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEsingle) 142 return IEEESingleVal; 143 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEdouble) 144 return IEEEDoubleVal; 145 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::x87DoubleExtended) 146 return X87DoubleExtendedVal; 147 if (Sem == (const llvm::fltSemantics*)&llvm::APFloat::PPCDoubleDouble) 148 return PPCDoubleDoubleVal; 149 assert(Sem == (const llvm::fltSemantics*)&llvm::APFloat::IEEEquad); 150 return IEEEQuadVal; 151 } 152 153 static void DefineFloatMacros(std::vector<char> &Buf, const char *Prefix, 154 const llvm::fltSemantics *Sem) { 155 const char *DenormMin, *Epsilon, *Max, *Min; 156 DenormMin = PickFP(Sem, "1.40129846e-45F", "4.9406564584124654e-324", 157 "3.64519953188247460253e-4951L", 158 "4.94065645841246544176568792868221e-324L", 159 "6.47517511943802511092443895822764655e-4966L"); 160 int Digits = PickFP(Sem, 6, 15, 18, 31, 33); 161 Epsilon = PickFP(Sem, "1.19209290e-7F", "2.2204460492503131e-16", 162 "1.08420217248550443401e-19L", 163 "4.94065645841246544176568792868221e-324L", 164 "1.92592994438723585305597794258492732e-34L"); 165 int HasInifinity = 1, HasQuietNaN = 1; 166 int MantissaDigits = PickFP(Sem, 24, 53, 64, 106, 113); 167 int Min10Exp = PickFP(Sem, -37, -307, -4931, -291, -4931); 168 int Max10Exp = PickFP(Sem, 38, 308, 4932, 308, 4932); 169 int MinExp = PickFP(Sem, -125, -1021, -16381, -968, -16381); 170 int MaxExp = PickFP(Sem, 128, 1024, 16384, 1024, 16384); 171 Min = PickFP(Sem, "1.17549435e-38F", "2.2250738585072014e-308", 172 "3.36210314311209350626e-4932L", 173 "2.00416836000897277799610805135016e-292L", 174 "3.36210314311209350626267781732175260e-4932L"); 175 Max = PickFP(Sem, "3.40282347e+38F", "1.7976931348623157e+308", 176 "1.18973149535723176502e+4932L", 177 "1.79769313486231580793728971405301e+308L", 178 "1.18973149535723176508575932662800702e+4932L"); 179 180 char MacroBuf[100]; 181 sprintf(MacroBuf, "__%s_DENORM_MIN__=%s", Prefix, DenormMin); 182 DefineBuiltinMacro(Buf, MacroBuf); 183 sprintf(MacroBuf, "__%s_DIG__=%d", Prefix, Digits); 184 DefineBuiltinMacro(Buf, MacroBuf); 185 sprintf(MacroBuf, "__%s_EPSILON__=%s", Prefix, Epsilon); 186 DefineBuiltinMacro(Buf, MacroBuf); 187 sprintf(MacroBuf, "__%s_HAS_INFINITY__=%d", Prefix, HasInifinity); 188 DefineBuiltinMacro(Buf, MacroBuf); 189 sprintf(MacroBuf, "__%s_HAS_QUIET_NAN__=%d", Prefix, HasQuietNaN); 190 DefineBuiltinMacro(Buf, MacroBuf); 191 sprintf(MacroBuf, "__%s_MANT_DIG__=%d", Prefix, MantissaDigits); 192 DefineBuiltinMacro(Buf, MacroBuf); 193 sprintf(MacroBuf, "__%s_MAX_10_EXP__=%d", Prefix, Max10Exp); 194 DefineBuiltinMacro(Buf, MacroBuf); 195 sprintf(MacroBuf, "__%s_MAX_EXP__=%d", Prefix, MaxExp); 196 DefineBuiltinMacro(Buf, MacroBuf); 197 sprintf(MacroBuf, "__%s_MAX__=%s", Prefix, Max); 198 DefineBuiltinMacro(Buf, MacroBuf); 199 sprintf(MacroBuf, "__%s_MIN_10_EXP__=(%d)", Prefix, Min10Exp); 200 DefineBuiltinMacro(Buf, MacroBuf); 201 sprintf(MacroBuf, "__%s_MIN_EXP__=(%d)", Prefix, MinExp); 202 DefineBuiltinMacro(Buf, MacroBuf); 203 sprintf(MacroBuf, "__%s_MIN__=%s", Prefix, Min); 204 DefineBuiltinMacro(Buf, MacroBuf); 205 sprintf(MacroBuf, "__%s_HAS_DENORM__=1", Prefix); 206 DefineBuiltinMacro(Buf, MacroBuf); 207 } 208 209 210 /// DefineTypeSize - Emit a macro to the predefines buffer that declares a macro 211 /// named MacroName with the max value for a type with width 'TypeWidth' a 212 /// signedness of 'isSigned' and with a value suffix of 'ValSuffix' (e.g. LL). 213 static void DefineTypeSize(const char *MacroName, unsigned TypeWidth, 214 const char *ValSuffix, bool isSigned, 215 std::vector<char> &Buf) { 216 char MacroBuf[60]; 217 long long MaxVal; 218 if (isSigned) 219 MaxVal = (1LL << (TypeWidth - 1)) - 1; 220 else 221 MaxVal = ~0LL >> (64-TypeWidth); 222 223 // FIXME: Switch to using raw_ostream and avoid utostr(). 224 sprintf(MacroBuf, "%s=%s%s", MacroName, llvm::utostr(MaxVal).c_str(), 225 ValSuffix); 226 DefineBuiltinMacro(Buf, MacroBuf); 227 } 228 229 /// DefineTypeSize - An overloaded helper that uses TargetInfo to determine 230 /// the width, suffix, and signedness of the given type 231 static void DefineTypeSize(const char *MacroName, TargetInfo::IntType Ty, 232 const TargetInfo &TI, std::vector<char> &Buf) { 233 DefineTypeSize(MacroName, TI.getTypeWidth(Ty), TI.getTypeConstantSuffix(Ty), 234 TI.isTypeSigned(Ty), Buf); 235 } 236 237 static void DefineType(const char *MacroName, TargetInfo::IntType Ty, 238 std::vector<char> &Buf) { 239 char MacroBuf[60]; 240 sprintf(MacroBuf, "%s=%s", MacroName, TargetInfo::getTypeName(Ty)); 241 DefineBuiltinMacro(Buf, MacroBuf); 242 } 243 244 static void DefineTypeWidth(const char *MacroName, TargetInfo::IntType Ty, 245 const TargetInfo &TI, std::vector<char> &Buf) { 246 char MacroBuf[60]; 247 sprintf(MacroBuf, "%s=%d", MacroName, TI.getTypeWidth(Ty)); 248 DefineBuiltinMacro(Buf, MacroBuf); 249 } 250 251 static void DefineExactWidthIntType(TargetInfo::IntType Ty, 252 const TargetInfo &TI, std::vector<char> &Buf) { 253 char MacroBuf[60]; 254 int TypeWidth = TI.getTypeWidth(Ty); 255 sprintf(MacroBuf, "__INT%d_TYPE__", TypeWidth); 256 DefineType(MacroBuf, Ty, Buf); 257 258 259 const char *ConstSuffix = TargetInfo::getTypeConstantSuffix(Ty); 260 if (strlen(ConstSuffix) > 0) { 261 sprintf(MacroBuf, "__INT%d_C_SUFFIX__=%s", TypeWidth, ConstSuffix); 262 DefineBuiltinMacro(Buf, MacroBuf); 263 } 264 } 265 266 static void InitializePredefinedMacros(const TargetInfo &TI, 267 const LangOptions &LangOpts, 268 std::vector<char> &Buf) { 269 char MacroBuf[60]; 270 // Compiler version introspection macros. 271 DefineBuiltinMacro(Buf, "__llvm__=1"); // LLVM Backend 272 DefineBuiltinMacro(Buf, "__clang__=1"); // Clang Frontend 273 274 // Currently claim to be compatible with GCC 4.2.1-5621. 275 DefineBuiltinMacro(Buf, "__GNUC_MINOR__=2"); 276 DefineBuiltinMacro(Buf, "__GNUC_PATCHLEVEL__=1"); 277 DefineBuiltinMacro(Buf, "__GNUC__=4"); 278 DefineBuiltinMacro(Buf, "__GXX_ABI_VERSION=1002"); 279 DefineBuiltinMacro(Buf, "__VERSION__=\"4.2.1 Compatible Clang Compiler\""); 280 281 282 // Initialize language-specific preprocessor defines. 283 284 // These should all be defined in the preprocessor according to the 285 // current language configuration. 286 if (!LangOpts.Microsoft) 287 DefineBuiltinMacro(Buf, "__STDC__=1"); 288 if (LangOpts.AsmPreprocessor) 289 DefineBuiltinMacro(Buf, "__ASSEMBLER__=1"); 290 291 if (!LangOpts.CPlusPlus) { 292 if (LangOpts.C99) 293 DefineBuiltinMacro(Buf, "__STDC_VERSION__=199901L"); 294 else if (!LangOpts.GNUMode && LangOpts.Digraphs) 295 DefineBuiltinMacro(Buf, "__STDC_VERSION__=199409L"); 296 } 297 298 // Standard conforming mode? 299 if (!LangOpts.GNUMode) 300 DefineBuiltinMacro(Buf, "__STRICT_ANSI__=1"); 301 302 if (LangOpts.CPlusPlus0x) 303 DefineBuiltinMacro(Buf, "__GXX_EXPERIMENTAL_CXX0X__"); 304 305 if (LangOpts.Freestanding) 306 DefineBuiltinMacro(Buf, "__STDC_HOSTED__=0"); 307 else 308 DefineBuiltinMacro(Buf, "__STDC_HOSTED__=1"); 309 310 if (LangOpts.ObjC1) { 311 DefineBuiltinMacro(Buf, "__OBJC__=1"); 312 if (LangOpts.ObjCNonFragileABI) { 313 DefineBuiltinMacro(Buf, "__OBJC2__=1"); 314 DefineBuiltinMacro(Buf, "OBJC_ZEROCOST_EXCEPTIONS=1"); 315 } 316 317 if (LangOpts.getGCMode() != LangOptions::NonGC) 318 DefineBuiltinMacro(Buf, "__OBJC_GC__=1"); 319 320 if (LangOpts.NeXTRuntime) 321 DefineBuiltinMacro(Buf, "__NEXT_RUNTIME__=1"); 322 } 323 324 // darwin_constant_cfstrings controls this. This is also dependent 325 // on other things like the runtime I believe. This is set even for C code. 326 DefineBuiltinMacro(Buf, "__CONSTANT_CFSTRINGS__=1"); 327 328 if (LangOpts.ObjC2) 329 DefineBuiltinMacro(Buf, "OBJC_NEW_PROPERTIES"); 330 331 if (LangOpts.PascalStrings) 332 DefineBuiltinMacro(Buf, "__PASCAL_STRINGS__"); 333 334 if (LangOpts.Blocks) { 335 DefineBuiltinMacro(Buf, "__block=__attribute__((__blocks__(byref)))"); 336 DefineBuiltinMacro(Buf, "__BLOCKS__=1"); 337 } 338 339 if (LangOpts.Exceptions) 340 DefineBuiltinMacro(Buf, "__EXCEPTIONS=1"); 341 342 if (LangOpts.CPlusPlus) { 343 DefineBuiltinMacro(Buf, "__DEPRECATED=1"); 344 DefineBuiltinMacro(Buf, "__GNUG__=4"); 345 DefineBuiltinMacro(Buf, "__GXX_WEAK__=1"); 346 if (LangOpts.GNUMode) 347 DefineBuiltinMacro(Buf, "__cplusplus=1"); 348 else 349 // C++ [cpp.predefined]p1: 350 // The name_ _cplusplusis defined to the value199711Lwhen compiling a 351 // C++ translation unit. 352 DefineBuiltinMacro(Buf, "__cplusplus=199711L"); 353 DefineBuiltinMacro(Buf, "__private_extern__=extern"); 354 // Ugly hack to work with GNU libstdc++. 355 DefineBuiltinMacro(Buf, "_GNU_SOURCE=1"); 356 } 357 358 if (LangOpts.Microsoft) { 359 // Filter out some microsoft extensions when trying to parse in ms-compat 360 // mode. 361 DefineBuiltinMacro(Buf, "__int8=__INT8_TYPE__"); 362 DefineBuiltinMacro(Buf, "__int16=__INT16_TYPE__"); 363 DefineBuiltinMacro(Buf, "__int32=__INT32_TYPE__"); 364 DefineBuiltinMacro(Buf, "__int64=__INT64_TYPE__"); 365 // Both __PRETTY_FUNCTION__ and __FUNCTION__ are GCC extensions, however 366 // VC++ appears to only like __FUNCTION__. 367 DefineBuiltinMacro(Buf, "__PRETTY_FUNCTION__=__FUNCTION__"); 368 // Work around some issues with Visual C++ headerws. 369 if (LangOpts.CPlusPlus) { 370 // Since we define wchar_t in C++ mode. 371 DefineBuiltinMacro(Buf, "_WCHAR_T_DEFINED=1"); 372 DefineBuiltinMacro(Buf, "_NATIVE_WCHAR_T_DEFINED=1"); 373 // FIXME: This should be temporary until we have a __pragma 374 // solution, to avoid some errors flagged in VC++ headers. 375 DefineBuiltinMacro(Buf, "_CRT_SECURE_CPP_OVERLOAD_SECURE_NAMES=0"); 376 } 377 } 378 379 if (LangOpts.Optimize) 380 DefineBuiltinMacro(Buf, "__OPTIMIZE__=1"); 381 if (LangOpts.OptimizeSize) 382 DefineBuiltinMacro(Buf, "__OPTIMIZE_SIZE__=1"); 383 384 // Initialize target-specific preprocessor defines. 385 386 // Define type sizing macros based on the target properties. 387 assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far"); 388 DefineBuiltinMacro(Buf, "__CHAR_BIT__=8"); 389 390 DefineTypeSize("__SCHAR_MAX__", TI.getCharWidth(), "", true, Buf); 391 DefineTypeSize("__SHRT_MAX__", TargetInfo::SignedShort, TI, Buf); 392 DefineTypeSize("__INT_MAX__", TargetInfo::SignedInt, TI, Buf); 393 DefineTypeSize("__LONG_MAX__", TargetInfo::SignedLong, TI, Buf); 394 DefineTypeSize("__LONG_LONG_MAX__", TargetInfo::SignedLongLong, TI, Buf); 395 DefineTypeSize("__WCHAR_MAX__", TI.getWCharType(), TI, Buf); 396 DefineTypeSize("__INTMAX_MAX__", TI.getIntMaxType(), TI, Buf); 397 398 DefineType("__INTMAX_TYPE__", TI.getIntMaxType(), Buf); 399 DefineType("__UINTMAX_TYPE__", TI.getUIntMaxType(), Buf); 400 DefineTypeWidth("__INTMAX_WIDTH__", TI.getIntMaxType(), TI, Buf); 401 DefineType("__PTRDIFF_TYPE__", TI.getPtrDiffType(0), Buf); 402 DefineTypeWidth("__PTRDIFF_WIDTH__", TI.getPtrDiffType(0), TI, Buf); 403 DefineType("__INTPTR_TYPE__", TI.getIntPtrType(), Buf); 404 DefineTypeWidth("__INTPTR_WIDTH__", TI.getIntPtrType(), TI, Buf); 405 DefineType("__SIZE_TYPE__", TI.getSizeType(), Buf); 406 DefineTypeWidth("__SIZE_WIDTH__", TI.getSizeType(), TI, Buf); 407 DefineType("__WCHAR_TYPE__", TI.getWCharType(), Buf); 408 DefineTypeWidth("__WCHAR_WIDTH__", TI.getWCharType(), TI, Buf); 409 DefineType("__WINT_TYPE__", TI.getWIntType(), Buf); 410 DefineTypeWidth("__WINT_WIDTH__", TI.getWIntType(), TI, Buf); 411 DefineTypeWidth("__SIG_ATOMIC_WIDTH__", TI.getSigAtomicType(), TI, Buf); 412 413 DefineFloatMacros(Buf, "FLT", &TI.getFloatFormat()); 414 DefineFloatMacros(Buf, "DBL", &TI.getDoubleFormat()); 415 DefineFloatMacros(Buf, "LDBL", &TI.getLongDoubleFormat()); 416 417 // Define a __POINTER_WIDTH__ macro for stdint.h. 418 sprintf(MacroBuf, "__POINTER_WIDTH__=%d", (int)TI.getPointerWidth(0)); 419 DefineBuiltinMacro(Buf, MacroBuf); 420 421 if (!LangOpts.CharIsSigned) 422 DefineBuiltinMacro(Buf, "__CHAR_UNSIGNED__"); 423 424 // Define exact-width integer types for stdint.h 425 sprintf(MacroBuf, "__INT%d_TYPE__=char", TI.getCharWidth()); 426 DefineBuiltinMacro(Buf, MacroBuf); 427 428 if (TI.getShortWidth() > TI.getCharWidth()) 429 DefineExactWidthIntType(TargetInfo::SignedShort, TI, Buf); 430 431 if (TI.getIntWidth() > TI.getShortWidth()) 432 DefineExactWidthIntType(TargetInfo::SignedInt, TI, Buf); 433 434 if (TI.getLongWidth() > TI.getIntWidth()) 435 DefineExactWidthIntType(TargetInfo::SignedLong, TI, Buf); 436 437 if (TI.getLongLongWidth() > TI.getLongWidth()) 438 DefineExactWidthIntType(TargetInfo::SignedLongLong, TI, Buf); 439 440 // Add __builtin_va_list typedef. 441 { 442 const char *VAList = TI.getVAListDeclaration(); 443 Buf.insert(Buf.end(), VAList, VAList+strlen(VAList)); 444 Buf.push_back('\n'); 445 } 446 447 if (const char *Prefix = TI.getUserLabelPrefix()) { 448 sprintf(MacroBuf, "__USER_LABEL_PREFIX__=%s", Prefix); 449 DefineBuiltinMacro(Buf, MacroBuf); 450 } 451 452 // Build configuration options. FIXME: these should be controlled by 453 // command line options or something. 454 DefineBuiltinMacro(Buf, "__FINITE_MATH_ONLY__=0"); 455 456 if (LangOpts.GNUInline) 457 DefineBuiltinMacro(Buf, "__GNUC_GNU_INLINE__=1"); 458 else 459 DefineBuiltinMacro(Buf, "__GNUC_STDC_INLINE__=1"); 460 461 if (LangOpts.NoInline) 462 DefineBuiltinMacro(Buf, "__NO_INLINE__=1"); 463 464 if (unsigned PICLevel = LangOpts.PICLevel) { 465 sprintf(MacroBuf, "__PIC__=%d", PICLevel); 466 DefineBuiltinMacro(Buf, MacroBuf); 467 468 sprintf(MacroBuf, "__pic__=%d", PICLevel); 469 DefineBuiltinMacro(Buf, MacroBuf); 470 } 471 472 // Macros to control C99 numerics and <float.h> 473 DefineBuiltinMacro(Buf, "__FLT_EVAL_METHOD__=0"); 474 DefineBuiltinMacro(Buf, "__FLT_RADIX__=2"); 475 sprintf(MacroBuf, "__DECIMAL_DIG__=%d", 476 PickFP(&TI.getLongDoubleFormat(), -1/*FIXME*/, 17, 21, 33, 36)); 477 DefineBuiltinMacro(Buf, MacroBuf); 478 479 if (LangOpts.getStackProtectorMode() == LangOptions::SSPOn) 480 DefineBuiltinMacro(Buf, "__SSP__=1"); 481 else if (LangOpts.getStackProtectorMode() == LangOptions::SSPReq) 482 DefineBuiltinMacro(Buf, "__SSP_ALL__=2"); 483 484 // Get other target #defines. 485 TI.getTargetDefines(LangOpts, Buf); 486 } 487 488 // Initialize the remapping of files to alternative contents, e.g., 489 // those specified through other files. 490 static void InitializeFileRemapping(Diagnostic &Diags, 491 SourceManager &SourceMgr, 492 FileManager &FileMgr, 493 const PreprocessorOptions &InitOpts) { 494 // Remap files in the source manager. 495 for (PreprocessorOptions::remapped_file_iterator 496 Remap = InitOpts.remapped_file_begin(), 497 RemapEnd = InitOpts.remapped_file_end(); 498 Remap != RemapEnd; 499 ++Remap) { 500 // Find the file that we're mapping to. 501 const FileEntry *ToFile = FileMgr.getFile(Remap->second); 502 if (!ToFile) { 503 Diags.Report(diag::err_fe_remap_missing_to_file) 504 << Remap->first << Remap->second; 505 continue; 506 } 507 508 // Create the file entry for the file that we're mapping from. 509 const FileEntry *FromFile = FileMgr.getVirtualFile(Remap->first, 510 ToFile->getSize(), 511 0); 512 if (!FromFile) { 513 Diags.Report(diag::err_fe_remap_missing_from_file) 514 << Remap->first; 515 continue; 516 } 517 518 // Load the contents of the file we're mapping to. 519 std::string ErrorStr; 520 const llvm::MemoryBuffer *Buffer 521 = llvm::MemoryBuffer::getFile(ToFile->getName(), &ErrorStr); 522 if (!Buffer) { 523 Diags.Report(diag::err_fe_error_opening) 524 << Remap->second << ErrorStr; 525 continue; 526 } 527 528 // Override the contents of the "from" file with the contents of 529 // the "to" file. 530 SourceMgr.overrideFileContents(FromFile, Buffer); 531 } 532 } 533 534 /// InitializePreprocessor - Initialize the preprocessor getting it and the 535 /// environment ready to process a single file. This returns true on error. 536 /// 537 void clang::InitializePreprocessor(Preprocessor &PP, 538 const PreprocessorOptions &InitOpts, 539 const HeaderSearchOptions &HSOpts) { 540 std::vector<char> PredefineBuffer; 541 542 InitializeFileRemapping(PP.getDiagnostics(), PP.getSourceManager(), 543 PP.getFileManager(), InitOpts); 544 545 const char *LineDirective = "# 1 \"<built-in>\" 3\n"; 546 PredefineBuffer.insert(PredefineBuffer.end(), 547 LineDirective, LineDirective+strlen(LineDirective)); 548 549 // Install things like __POWERPC__, __GNUC__, etc into the macro table. 550 if (InitOpts.UsePredefines) 551 InitializePredefinedMacros(PP.getTargetInfo(), PP.getLangOptions(), 552 PredefineBuffer); 553 554 // Add on the predefines from the driver. Wrap in a #line directive to report 555 // that they come from the command line. 556 LineDirective = "# 1 \"<command line>\" 1\n"; 557 PredefineBuffer.insert(PredefineBuffer.end(), 558 LineDirective, LineDirective+strlen(LineDirective)); 559 560 // Process #define's and #undef's in the order they are given. 561 for (unsigned i = 0, e = InitOpts.Macros.size(); i != e; ++i) { 562 if (InitOpts.Macros[i].second) // isUndef 563 UndefineBuiltinMacro(PredefineBuffer, InitOpts.Macros[i].first.c_str()); 564 else 565 DefineBuiltinMacro(PredefineBuffer, InitOpts.Macros[i].first.c_str(), 566 &PP.getDiagnostics()); 567 } 568 569 // If -imacros are specified, include them now. These are processed before 570 // any -include directives. 571 for (unsigned i = 0, e = InitOpts.MacroIncludes.size(); i != e; ++i) 572 AddImplicitIncludeMacros(PredefineBuffer, InitOpts.MacroIncludes[i]); 573 574 // Process -include directives. 575 for (unsigned i = 0, e = InitOpts.Includes.size(); i != e; ++i) { 576 const std::string &Path = InitOpts.Includes[i]; 577 if (Path == InitOpts.ImplicitPTHInclude) 578 AddImplicitIncludePTH(PredefineBuffer, PP, Path); 579 else 580 AddImplicitInclude(PredefineBuffer, Path); 581 } 582 583 // Exit the command line and go back to <built-in> (2 is LC_LEAVE). 584 LineDirective = "# 1 \"<built-in>\" 2\n"; 585 PredefineBuffer.insert(PredefineBuffer.end(), 586 LineDirective, LineDirective+strlen(LineDirective)); 587 588 // Null terminate PredefinedBuffer and add it. 589 PredefineBuffer.push_back(0); 590 PP.setPredefines(&PredefineBuffer[0]); 591 592 // Initialize the header search object. 593 ApplyHeaderSearchOptions(PP.getHeaderSearchInfo(), HSOpts, 594 PP.getLangOptions(), 595 PP.getTargetInfo().getTriple()); 596 } 597